Precast voided slabs
precast voided slabs K Prasad (2014) [2]: Here analysis of voided deck slab and cellular deck slab using Midas civil Additional projecting lattice girder is cast into the precast plank, during production, between the polystyrene void formers to anchor the plank to the structural screed and cater for the interface sheer requirements. p. 1 Introduction 4 1. Following additional advantages due […] Segmental voided slabs. Precast elements are the elements that are casted elsewhere under controlled conditions and are bought to the site and erected. 0 Voided Slab Example 1. The top reinforcement mat is placed on site along with a layer of stitching reinforcement across the joint between slabs, prior to pouring the in-situ concrete. PETRA ® is a unique technical solution that has all the benefits of a standardized product, while being used for applications that usually require careful static analyses and tailor-made structural solutions. - 30-90 ft steel beam with solid wood deck bridges. A family run business with over 60 years’ experience, we offer an extensive range of precast concrete flooring solutions including beam and block/poly flooring, ThermaBeam™ flooring, hollowcore flooring, stairs and landings to the industrial, commercial and domestic markets. The precast system as shown in Table 3, includes the precast hollow core planks and a 2”concrete topping with 6”x6” W. Dec 14, 2019 - Explore laolu awe's board "PRECAST" on Pinterest. Material of the precast part of the slab and parameters of void formers are specified in the May 04, 2020 · Voided slab construction has advantages such as reducing self-weight, Cost efficiencies and fast Construction. 2 Slab/Slab Bridge Connections [1] Horizontal ties joining slab bridge elements 4. Precast concrete slabs are cast and cured in manufacturing plants, and then delivered to the construction site to be erected. We do this by by creating a ‘Model in-place component’, found on the Structure Tab on the Component drop down: Hollowcore slabs are prestressed floor elements with voids. B5. 2015). Sep 2020 Added contact information. 16- Cross-sections of Voided Slabs (Joyce, 2014) . 5E Precast Prestressed Slab - 21” B5. The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3-3/4 of the slab. To remove the middle concrete in a slab, voided concrete came about as a viable option for slab lightening. 6-A8-2 Slab Girder Details 2 of 3 (dwg 134 kb) 5. Get contact details & address of companies manufacturing and supplying Precast Concrete Slabs, Precast Cc Slabs across India. that voided slabs are more convenient and efficient when compared to solid slab for bridge design. 16 BubbleDeck Voided Flat Slab Solutions COMPOSITE SLABS a) With precast, prestressed concrete beams laid in place and slab poured over. Intermittent Precast Concrete Pavement Slab Repair means a 2 to 4. Our Bridge Division provides a range of design, fabrication and delivery options for almost any precast/prestressed bridge superstructure project. Voided slab principles have been applied in different applications dating back to the early 1900s. Septic Tanks. 0 Voided Slab Example 1. 640 klf uniformly distributed over 10 feet in the transverse direction. This is a hybrid of precast, prestressed concrete and cast-in-place concrete. Treat the slab A hollow core slab, also known as a voided slab, hollow core plank or simply a concrete plank is a precast slab of prestressed concrete typically used in the construction of floors in multi-story apartment buildings. These reduce the volume of concrete required, and also allow for longer spans to be achieved due to the reduced slab self-weight. Benefits of using Hollowcore Concrete Light Weight Complete Precast Solutions and Machinery With over 55 years of experience, UltraSpan has been assisting precast concrete plants worldwide by providing quality and reliable precast equipment. Onsite parking included. Your factory, warehouse or retail center will be faster and cheaper using our cutting edge concrete solutions that includes precast columns, walls and slabs. As needs change, your building is better prepared to adapt. Lattice girder slabs Lattice girder slabs act as permanent formwork and as precast soffits for robust, high capacity composite floor slabs. Lafarge precast concrete Insulcore wall systems are ideal for warehouses, manufacturing plants, schools, retail, office buildings, recreational facilities, hotels/motels, retirement residences, and virtually any other architectural application that calls for strength, beauty and fast- track construction. Apr 29, 2016 · moment slabs sheet 3 of 8 clr. X. Learn more and see projects with hollowcore slabs. 1 Introduction 335 6. 6-A8-5 Slab Girder End Diaphragm 5. Essentially you have one Precast wall, and create one in-place Void which represents every opening. Slab pre-construction meeting: At least 20 days prior to placing first voided concrete slab, Contractor shall Hollow-core slabs, also known as voided slabs, initially appeared as one-way elements in Europe during the 1950s, and are still commonly manufactured in precast form for applications where fast construction and low self-weight are required. Abstract: Voided slabs, using voids formed by permanent fillers or removable forms, have been used in reinforced concrete floor systems for more than 100 years. i. However, floor stiffness of voided RC slab is less than its solid counterpart and there is gap in literature about structural behaviors of voided RC slabs. Precast Hollowcore & solid floors. Alternately, consider placing the phase line between two beams. Septic Tanks. Jan 17, 2019 · This feature speeds up the precast concrete modeling process and further automates design to fabrication. Slab Bridge Behaviour [1] Structural behavior of slab and stringer bridges 4. 0. Richardson, Jr. 144 12. 2. . It is designed to support the working load of the concrete All the Technical Information you need about our products is listed here including product brochures, technical manuals, and CAD/MSD files. Designs include attractive single-piece arches, functional two-piece arches, conventionally reinforced flat bridges, parapets, wingwalls, headwalls and endwalls. They are cast with most, if not all, of the bottom reinforcement required; the top reinforcement is fixed in situ. 4 W. 81 x 0. 15” – 42” depth. Geography will give a hint as to the origin of the particular system, as they varied by location. These slabs are more efficient than traditional structural floor systems commonly used in the construction of office buildings. F. In essence, it consists of 2 ¼” of precast, prestressed concrete that functions as leave-in formwork. precast, prestressed concrete voided slab beams constructed with self-consolidating concrete, eliminating the need for concrete vibration. 50'-0" Span Precast/Prestressed Voided Slabs. 0. 8. Edward J. (vide May 04, 2020 · Concrete is heavy, and 5% of the world's CO2 is created during the manufacture of the cement that goes into it. 1 Stringer Bridge vs. -lbstightening torque); Reflective cracking due to loss of transverse prestressand grout degradation. , and metal decking. Changed name of Oldcastle Precast to Knife River Prestress Find here Precast Concrete Slabs, Precast Cc Slabs manufacturers, suppliers & exporters in India. Typical slabs are 4’ wide by 18” thick and up to 70’ long. The concept is simple: remove concrete mass from areas in the slab where it’s not needed to resist Balcony slabs as precast concrete elements combined with void former modules provide for an additional crucial advantage, as the lower deadweight of the component allows for smaller dimensions of the thermally insulated component and thus saving costs. Voided Slabs Generally Span 30' - 90'. To help increase your modelling speed on precast projects, Revit includes new precast hollow-core slabs (HCS) families with 13 additional types of precast hollow-core slabs, offering additional void geometries and strand patterns. The sys PCI Hollow Core Slab Producers Committee John E. The design concept for these types of units is identical and the only differences between them are the member depth, shape of the voids (if any), and the casting procedure. PRECAST SLABS PRECAST BOX BEAMS Slab Type Box Type Nom. Systems include Bridges, Buildings, Parking Garages, Detention Vaults, Floating Structures and Marine Piers. Standard precast beam types can cater for spans of up to 50m. Functional Classification CRR Steel Class I CRR Steel Class II CRR Steel The concrete or other cementitious material is added to precast the slab with the female sockets positioned along the upper side edges of the slab. Austral Deck incorporates triangular truss reinforcement (lattice girder) providing a bond between the precast and in-situ concrete. Pre-Tensioned Voided Slab quantity. Date: 10/1/2010. 9 Slab Design Example – Ut 3 / 48 May 20, 2017 · DIFFERENT TYPES OF VOIDED SLAB SYSTEM BUBBLE DECK -Bubble Deck is one brand of plastic void system which uses a precast filigree method to form voided slabs. 5% for 20 m, 30 m and 40 m spans. typical joint at adjoining slabs – 100-01-01 typical detail for voided slab Jul 17, 2014 · May 4, 2016. Hollow-core slabs, also known as voided slabs, initially appeared as one-way elements in Europe during the 1950s, and are still commonly manufactured in precast form for applications where fast construction and low self-weight are required. Precast Versa-Set Building Roof Slab. Pre-manufactured carton void forms that are less than or equal to the beam width, having a curved, radial, vertically-supported edge adjacent to the drilled pier that conforms to the pier diameter. Mar 01, 2017 · Revit Precast Panels using Voids. 2019 (43) 31. Voided Slabs Generally Span 30' - 90'. The principal steel reinforcement is added during the manufacturing stage, with additional steel added on site. The Voided Floor Slab is a reinforced precast concrete slab which incorporates the cobiax void former system. The production of these elements is achieved using our Extruder and Slipformer machines that cast in one phase along a production bed without the need for any formworks. With a particular focus on quality, our Hollowcore is strong and durable, and our in-house engineering team provide design assistance. 5 CONCEPT FOR PRECAST SYSTEM. 2b-1, 4. Prestressed, Precast deck beams with voids usually do have a wearing surface placed on top but it is not a requirement. 14xW1. transportation industry. With a deadload of roughly 97 kg/m², the Cobute decking is lightest slab on the market. If desired, the male and female slabs can have a Cast-in-place concrete slab, precast concrete deck slab Cast-in-Place Concrete Multicell Box Monolithic concrete Cast-in-Place Concrete Tee Beam Monolithic concrete Precast Solid, Voided or Cellular Concrete Boxes with Shear Keys Cast-in-place concrete overlay Precast Solid, Voided, or Cellular Concrete Box with Shear Keys and Thenchoragea at the ends of the link slab was changed for the two specimens to try and simplify the installation process. Oldcastle Infrastructure is a new brand, which now houses all of our precast, storm water, enclosure, and C. Plastic voided slabs remove concrete from non-critical areas and replace the removed concrete with hollow plastic void formers while achieving similar load capacity as solid slabs. PRECAST PRESTRESSED CONCRETE DOUBLE-T BEAMS FOR SHORT-SPAN BRIDGES. Anjanadri Precast Private Limited Kharagpur, Dist. Contractor – Hoffman Construction The prestressed floor slabs are used where the loosely reinforced slabs are close to their limits, with regards to load and span width. Adjacent prestressed concrete slab units and box beams are especially appropriate at stream Standard and sample of a precast plain module [6] 2. . The BubbleDeck system virtually eliminates dead weight concrete from the middle of a floor slab by incorporating recycled plastic bubbles as a void. This makes the slab much lighter than a solid slabs of equal thickness or strength. The floor is one of many types of filigree systems. 6. Finally, the second layer of concrete completes the slab by flowing into the correct static structure. 5 tonnes per car parking space. 378 34798 3276 3353 789 26" VOID 879. The project erected over (24) precast pieces per day. Voided Slabs : Voided Slabs : Concrete Tech Voided Slabs Are A Precast Prestressed Slab For Bridge, Building, Marine Pier And Fish Passage Culvert Replacement Applications. 2. 534 7. These slabs can be used in applications where slab depth may be an issue or when construction speed is a factor. Voided slab solutions have previously been provided. Precast Beam A precast beam is primarily used as a ledge for other precast flooring types which ultimately give ways for obtaining optimal results. Primarily used as interior floors and roofs, Hollowcore is a prestressed concrete slab which Pre-Con has been producing for years. For instance, a full-sandwich panel that is 10-by-20-feet by eight inches thick (with a three inch void for insulation) weighs more than six tons. The voids in the concrete slab, which is to be cast later, are inserted in the form of void formers or structural formers, both made out of plastic. Architect – Port of Portland. A decrease in moments from solid to voided slabs is about 11%, 7% and 5. It also provides a superior appearance and long-term durability. ii) Shear due to self wt. Voided Slab is available in various thickness and standard 4′-0″ width and comes standard with a broom finish top surface and a cast in sheer key. Hollowcore flooring slab is a concrete flooring material which exploits the strength and durability of precast concrete, whilst reducing the weight which can be its main drawback. 0 VOIDED SLAB DESIGN Precast concrete is our only business, and our 50 years of expertise reflects that singular concentration. 6-A8-3 Slab Girder Details 3 of 3 5. In addition, it increases worker and driver safety. Prestressed Hollowcore slabs; Prestressed double T slabs/ single T slabs; Flat Prestressed solid slabs; Flat non-Prestressed solid slabs; Ribbed Slabs; Polyslabs (Concretec’s system of voided slabs). 215 x 2400 + 0. 95%) Title : Krian-Legundi-Bunder-Manyar (KLBM) Toll Road Nov 16, 2017 · Index “various”: Prestressed Voided Slab Units (1959) 30 -40 foot spans; Asphalt overlay; Transverse Post-Tensioned Bars at mid-or third-points (500 ft. The Northeast Precast Design Scholarship is making a difference in the life of a talented and motivated NJIT student. Place the phase line a minimum of 4 inches past the centerline of the girder, so that the horizontal interface reinforcement is cast into the initial construction phase of the slab. 3. 758 13. Create individual floor segments – solid (massive) slabs, hollow core slabs (voided slabs, hollow core plank, concrete plank) roof slabs, steel-reinforced slabs – according to panel layout. Austral Precast 15" VOID 646. SlabVoid ® is a corrugated paper carton void form that helps eliminate severe damage to a structural concrete slab by creating a space between the slab and underlying expansive soils. Up to 15” depth. Tennessee Structural Engineers Association - Home Page 5. To overcome this issue, C-shaped slabs that need less props and formworks can be used . 5 Precast Beam-and-Plank Flooring 324 5. typical precast barrier details Prestressed Concrete Slab A hollow core slab, also known as a voided slab or hollow core plank, is a precast slab of Prestressed concrete typically used in the construction of floors in multi-story apartment buildings. Short-span bridges, having span lengths from 25 to 60 ft (7. voided slabs needs to be applied properly in commercial slab design software programs, which automatically cal-culate self-weight based on full slab thickness. 14xW1. Precast Beam A precast beam is primarily used as a ledge for other precast flooring types which ultimately give ways for obtaining optimal results. 4. 5 m long repair carried out using Some not all voided slab bridges are precast. Precast concrete slab beam: All reinforcement. The floors are classified into prestressed and non-prestressed depending on the structural characteristics of the precast plate. The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3-3/4 of the slab. Voided Slabs : Voided Slabs : Concrete Tech Voided Slabs Are A Precast Prestressed Slab For Bridge, Building, Marine Pier And Fish Passage Culvert Replacement Applications. PETRA ® Slab Hanger is used to support hollow-core slabs and make openings and configurations into hollow-core slab floors. 6 Design Calculations 325 5. Reduce evaporation over the slab by using a fog spray or slab cover. 25 x 2400 = 595 Kg. 45 x 1. Slabs can be formed with either reduced ends or a notched end to allow the slab to sit on the shelf angle. Normally, span of precast slab SlabVoid ® — Properly creates void space directly underneath the structural concrete slab with various strengths available to meet the needs of each individual project 4 SureCover Board™ — Protects the void form from damage caused by pinpoint loading, closes small gaps between pieces, and evenly distributes working load across supporting Aug 18, 2020 · For the purpose of slab design, the lane load consists of a load equal to 0. Voided slab systems are constructed primarily by two methods: a filigree method in which some part is precast in workshop or concrete yard, and method in which the whole system is constructed on cast on site. Once placed by the erection team the filigree plates are covered with in-situ concrete. Slabs can be cantilevered up to 1. Custom Voided Slab. Welcome to Coreslab Structures. The concept centers on removing concrete mass from the areas of the slab where it is not structurally efficient; thus reducing the dead load by as much as 35%. Section deck type: Prestressed slab of Β35 concrete with circular voids constructed by on site concrete. voided slabs with solid cross shapes and voided slabs with solid heads were analysed in this study. Lafarge Precast Concrete Insulcore Wall Panels. I use this method for complex panels. Bend the #4 bars extending from top of foundation at a 3'' radius over the top of the Precast Garage Floor, leaving enough clearance for the concrete topping to consolidate around the rebar. This floor system allows for large, clear spans and efficient overall slab thicknesses. 6-A8-4 Slab Girder Fixed Diaphragm 5. Abutments CIP concrete spread fottings cast on bedrock. 5D Precast Prestressed Slab - 18” B5. 5. has constructed the following types of bridges: - 30-90 ft modular steel bridges. Joyce Thesis submitted to the faculty of the Virginia Polytechnic Institute and State University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE in CIVIL ENGINEERING Thomas E. 01. Over the last four decades, we have emerged as a major supplier of structural, architectural and hollow core solutions to markets in Canada and the United States. Grids accommodate any specified MEP and post-tensioning strand. Read about company. The versatility of these slabs makes them a good fit for many customized bridge projects. Modular Systems 2a - Modular Beam Systems Deck Bulb Tees. 2. In this method, the voids are assembled in steel cages and then concrete is poured to a height part way up the voids . The distribution of dead load of slab, wearing course etc. is shown in Fig. With a Lockable Dowel, there is less requirement for the slabs to be propped or a support corbel to be constructed, as shear load is transferred by the dowel. Austral Deck is a exible solution designed to be installed with the entire range of Austral Precast Walling, Framework, Stairs and Balcony Solutions offering a complete precast building solution. Our precast hollowcore floors are available in sections 150, 200, 250 and 260mm deep. 1. It also provides a superior appearance and long-term durability. Solid slab is normal slab which is used without any void spaces( except left for conduit for installation ) where as ho Keywords: voided slabs, precast concrete, hollow-core slabs, span. The twin wall and filigree floor slab we produce has proven its worth over decades of years of construction and development and we use the most up to date computer aided design and CAD CAM factory facility available to manufacture these elements. Precast Versa-Set Building Roof Slab. The precast concrete slab has tubular voids extending the full length of the slab, typically with a diameter equal to the 2/3-3/4 of the slab. The following sections from the PCI Design Handbook include interaction curves, load tables, and section properties for various precast concrete components. 6. See more ideas about precast concrete, concrete, concrete roof. Traditionally, waffle slabs, hollow-core precast slabs, and single/double Sep 21, 2013 · A hollow core slab , also known as a voided slab or hollow core plank is a precast slab of prestressed concrete typically used in the construction of floors in multi-story apartment buildings. Check pouring rates with Structural Project Manager if it is indicated necessary to exceed the basic minimum rate of 25 cubic yards per hour. Cracking Unexpected cracking of concrete is a frequent cause of com-plaints. Avoid using air contents over 3% for interior slabs. 085 x 2500) = 2186 Kg. Nimmer Loris Collavino William C. They are fast, effective and proficient with AutoCAD and BIM software. Prestressed Concrete I Beam Design Example Civil. Both cover and landing slabs are cast to design specifications and made to order for just-in-time delivery. 18- Maximum Span Range for Voided Slab Bridge Systems (Idaho DOT, Jan 01, 2021 · Moreover, precast flooring systems devoid of concrete topping slabs are prevalent in various global construction industries, and this leads to water leakage at the joints of two by two precast slabs, particularly, in residential buildings . Gregory Klaus Rosenstern Pat Hynes Wes Schrooten Paul Kourajian Larry Stigler PRECAST / PRESTRESSED CONCRETE INSTITUTE 175 WEST JACKSON Solid slab is normal slab which is used without any void spaces( except left for conduit for installation ) where as hollow core slab is also called as a voided slab because it contains void spaces through out the length of the slab resulting in reduction of self weight and material cost. 6. The base of modules may be 120cm to 250 cm wide. The void between the unit and the steel beam is then filled with C25/30 grade concrete by the main contractor to tie the components together. Advantages of Deck Slabs . Figure 1 – Profile. - 40-50 ft precast voided slab bridges on cast in place foundation. The resulting concrete is totally homogeneous with a uniform surface finish and is free of “bug” holes. "Thanks to this scholarship I was able to put more into my designs this semester and push each project a little bit further than I normally would have considering the usual material limitations. 622 10. Custom Roof Slab. Voided Precast Prestressed slabs, with maximum depths of about 0. The use of precast walls speeds the erection process. 5, Equ6. Pier Head Precast; Full Slab, Half Slab, Deck Slab, Voided Slab Voided Slab; RC Pipe; SprigWP; Railway Sleeper; Electric Pole; Spunpile (diameter 1,2m ; length 50 Pre-stressed, Precast concrete Hollow core Load Bearing slabs / Planks for Floors, roofs & walls. The I-void form has a box shape and it is elevated by the use of four conic feet. 3 Health & Safety 6 1. 29 m), account for half the publicly owned structures in New York State, which suggests the potential benefits for the State Department of Transportation and others from further economies in construction of bridges in this span range. A hollow core slab, also known as a voided slab, hollow core plank or simply a concrete plank is a precast slab of prestressed concrete typically used in the construction of floors in multi-story apartment buildings. We design and manufacture standard and custom precast concrete products to meet large-scale infrastructure demands for highway construction, retaining walls, electric and gas utility, telecommunications, water, on-site wastewater, and Sep 21, 2013 · A hollow core slab , also known as a voided slab or hollow core plank is a precast slab of prestressed concrete typically used in the construction of floors in multi-story apartment buildings. West Midnapore, West Bengal Aug 03, 2017 · Flat plate–voided concrete slab systems, which have been used for many years in Europe and other parts of the world, are becoming increasingly popular in the United States because of their many inherent benefits. Since 1975, we have been a premier producer of precast/prestressed concrete products. Voided Slabs generally span 30' - 90'. 9. 6. Plastbau slabs made of expanded polystyrene used as a permanent shutter The American Concrete Institute. The icon for input of a new voided slab is located in service Concrete Advanced. Buildings – Precast. Pre-Tensioned Voided Slab quantity. Aug 11, 2020 · Prestressed hollow core slabs-A hollow core slab, also known as a voided slab, hollow core plank, or simply a concrete plank is a precast slab of prestressed concrete typically used in the construction of floors in multi-story apartment buildings. R. VOIDED SLAB DESIGN EXAMPLE_图文_百度文库 CONSPAN Version 4. 6. 568 10. Voided Slabs are a precast prestressed slab for bridge, building, marine pier and fish passage culvert replacement applications. Pile driving, precast cap erection, precast beam erection, all from the rear. Concrete Technology produces a variety of products that meet a range of project requirements. Plastic bubbles were omitted in locations of high congestion, to ensure both structural performance and to reduce conduit bends. Precast pretensioned adjacent member bridges, consisting primarily of concrete box beams, have been in use since 1950 in the United States. Jan 03, 2019 · A voided slab system is an efficient construction method that reduces the concrete dead-load or self-weight, to enable an increase in the span of a building or structure (Aguado et al. 52 8. Precast & Prestressed Concrete Slabs. This paper investigates the stresses in the end zones of such a uniquely shaped precast element. 225 x (0. It is produced by simple hollow core concrete extrusion machine compared to hollow core slip-formers machine. 8 PRE-INSTALLATION MEETINGS A. Scon Infrastructure - Offering Voided Concrete Slabs, For Industrial, Size: 10 X 15 Feet at Rs 1200/square meter in Thane, Maharashtra. X. Oldcastle Infrastructure is a new brand, which now houses all of our precast, storm water, enclosure, and The pre-fabrication of voided slab panels required the trades to coordinate this work early and comprehensively. shorter spans might be normally reinforced and cast in simple precast plants whereas long spans are commonly voided and post tensioned or prestressed. This patented pushing technology extrudes or casts hollow core slab continuously on well-levelled, long & smooth concrete floor beds which is low on cement content (Zero slump). Voided Slab Girders Limit Install Constraints Accelerated Bridge Construction (ABC) The use of precast components can provide added value to accelerate bridge construction, an approach that significantly reduces the environmental impact of construction. Throughout our history, we have built innovation and passion into every component while delivering speed, strength and quality to the industry sectors we've come to know and understand. Austral Deck incorporates triangular truss reinforcement (lattice girder) providing a bond between the precast and in-situ concrete. The SlabVoid ® material provides a temporary platform for the placement of liquid concrete. Waffle slabs are This design guide presents state-of-the-art practices in voided slab construction. We manufacture and supply precast concrete walls and slabs for the Republic of Ireland and United Kingdom markets. Ultimately, this means greater freedom in design and architecture during and after construction as well as savings in material costs. Custom Voided Slab. 2. 4 W. These hollow core slabs have got many advantages. The Quick Turnaround Project located at the Portland International Airport included (266) precast/prestressed 12′-0″ wide double Tees, (96) inverted tees beams. Concrete weighs about 150 pounds per cubic foot, so precast items are heavy. Many products can be used in multiple systems. VS-BG. Voided biaxial slabs are reinforced concrete slabs in which voids reduce the amount of concrete and steel by placing different type of formworks or materials. The slab panels are lifted to the top of the column and then moved downwards to the final position. 533m (21") may be adopted for spans of about 6 to 15 m (20'-50'). for Voided Slab Bridges Patrick C. Floor spans up to 17 meters (~56 feet) and overall slab thicknesses up to 60 cm (~24 inches). W. The composite slab alternative system in Table 4, includes W8x10 beams, a 6” concrete slab with 6”x6” W. 2016; Aldejohann and Schnellenbach-Held 2002; Brunesi and Nascimbene 2015; Chung et al. Dec 11, 2015 · Thank you for all the information about precast concrete reinforcement. The units are typically 50mm to 100mm thick and 1200mm or 2400mm wide. noun. Nov 03, 2020 · The minimum rate of pour for solid slab or voided slabs is 20 linear feet of bridge per hour and not less than 25 cubic yards per hour. for the use of precast panels in the future phase. Voided Slabs Generally Span 30' - 90'. Precast bridge deck panels remove the construction operation from the jobsite and replace it with bridge deck installation. 3b-1 for both moment and shear. An outline of the background and the merits of half precast slab construction are discussed. The voided slab system has the same bearing capacity as conventional c oncrete solid slabs, and standard design and detailing techniques can b e directlyapplied. Voided slabs feature voids extending the full length of the slab. Designed with either solid or voided slabs, they are usually constructed with insitu concrete using traditional formwork and falsework systems. Cast-in-place voided slab bridges were very popular in the 1960s and generally provided a low profile bridge when used with grade seperations. This system innovatively integrates long-span prestressed concrete elements with exposed honed architectural surfaces, liquid radiant cooling systems, and forced return air plenums, as well as pre-plumbed fire sprinkler lines. Width Depth "D" 12" = 1’-0" (1 : 1) Box Type Nom. Cobiax The Cobiax system makes use of the same voided slab principles of creating voids within the concrete slabs to lighten the building structures. - 40-70 ft modular steel with precast concrete deck panels. of cross-beam = i x 2. 6 Choosing a Construction Method - Comparative Costs Precast slab members can be constructed in various widths, depth, and length to built spans up to 15 m. 3 Continuity A “semi-continuous” design approach is A hollow core slab , also known as a voided slab or hollow core plank is a precast slab of prestressed concrete typically used in the construction of floors in multi-story apartment buildings. This eliminates the time spent on forming, concrete placing, and concrete curing. 2 Texture of Precast Concrete Surfaces 339 Download PDF literature, find informative documentation with load ratings, specifications, and technical data on SureBuilt concrete construction products. ST-Notes ST400 ST800 ST-Single ST-Dual ST2200 Aug 25, 2020 · In precast, hollow, or ribbed slabs, part of the space that would otherwise be occupied by the concrete is left empty or filled with a material of less weight, such as ceramic bricks or expanded precast, prestressed concrete voided slab beams constructed with self-consolidating concrete, eliminating the need for concrete vibration. Precast concrete is the most commonly used building material in the world and a wide variety of products are available including flooring beams and slabs, walls, panels, balconies, staircases and more. Flood Super Voidslab - Void Slab Flooring See How It Works Watch this video to see how easy it is to install Flood Super Voidslab® Dec 05, 2011 · Some voided-slab systems can reduce construction time, especially precast systems or those placed on flat-plate forming systems. THERMAL MASS EFFECT Thermal mass is a property that enables precast concrete floors to absorb, store, and later release significant amounts of heat. α = angle between the shear reinforcement and the plane of slab fywd,ef = effective design strength of the punching shear reinforcement, = 250 + 0. Design of prestressed Concrete flat slabs structures org za. GMP Architecture LLC 's staff is knowledgeable with the Precast Industry. Engineer of Record – Port of Portland. 6. Waffle slabs are a common type of hollow-core slab which use the same principle as voided biaxial slabs. Also known as voided slabs, precast slabs, hollow core planks or concrete planks, hollow core concrete is a cost effective material which is a popular choice when constructing multi-storey buildings. Precast T-wall for Retaining Walls. 2019 Bulletin 2019/31 (57) The invention relates to a floor slab, which is intended to form a flooring deck. Hollowcore is ideally suited for large floor spans with commercial loading. It is easy to fabricate, transport, and erect precast slabs. Beam bridges can be quick to erect over existing roads, railways or rivers. 2009; Hwang et al. Structural benefits They weigh less, making the […] Oct 30, 2018 · The main effect of the voided slab system is to decrease the overall weight by as much as 35% when compared to a solid slab of the same capacity, while still offer ing otheradvantages. 0 VOIDED SLAB DESIGN Predalle floor slab by Travi Sud Spa is a module precast component, produced from precompressed reinforced concrete, of various depth, and strengthened with reinforcement, cast in-situ. But they can also be incorporated as industrially manufactured, fully precast elements, or in a combination with precast elements. Apr 23, 2020 · The figure also shows an optimized UHPC voided box slab using the same depth, width and load capacity. Cast-in-place concrete, also known as poured-in-place, is a concreting technique which is undertaken in situ or in the concrete component’s finished position. However, in a multispan floor slab system, designing for continuity over supports leads to increased span 4kg are added for every 100mm of void fill 42 PRECAST CONCRETE DIVIS ON 225. 25 d ≤ fywd (MPa. The slab will generally be modeled as a grillage type structure with the longitudinal beam members represented by prestressed or RC beams - also defined explicitly within the program. Bearing walls may be of masonry, precast concrete or cast-in-place construction. Biaxial voided slabs : A relatively new technology developed in Europe has taken the efficiency of cast-in-place flat plate slabs to new heights. Sep 27, 2015 · Advantages of Prestressed Concrete Most of the prestressed members are precast and therefore all the advantages or precast concrete hold true for prestressed concrete also. Owing to our enriched industrial experiences, we are devoted towards providing a wide variety of excellent quality Precast Concrete Slabs. 466 13121 1742 1757 673 18" VOID 698. Precast Footer with Steel “H” Pile; Precast Abutment Panels for “H” Pile Footer; Span Units (Flat top only) Box Culverts; Wing Walls; Sign Bases; Lagging Panels; Utility Vaults; Reinforced Concrete Pipe (RCP) Voided Slabs : Voided Slabs : Concrete Tech Voided Slabs Are A Precast Prestressed Slab For Bridge, Building, Marine Pier And Fish Passage Culvert Replacement Applications. 391 8. Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design We design and manufacture standard and custom precast concrete products to meet large-scale infrastructure demands for highway construction, retaining walls, electric and gas utility, telecommunications, water, on-site wastewater, and sewage applications. Other non-box elements, including tee-beams, multi-stemmed tees, inverted tees, deck bulb-tees, solid and voided slab beams, and U-shaped beams are also used in adjacent member bridges. Oct 11, 2016 · These can either be reinforced concrete cast in place voided slabs or hollow section precast units. slabs of concrete pavement with inter-connecting precast concrete slabs. Up to 8’ width. Our product line includes machinery for the production of hollow core, wall panels, and double tee, as well as forms and molds for several precast elements. Use for adjacent precast voided and box beams and spread precast box beam structures where outside face of concrete slab is poured flush with the outside face of the exterior beams: Add the following detail to the girder sheet(s): Require that the top outside exposed corner of all exterior beams have a 3/8” bevel full length. 0 VOIDED SLAB DESIGN Voided slabs are significantly improved versions of solid slabs and offer more improvements for the building as a whole. 3 Types of Hollowcore Slabs – There are 3 types of Hollowcore Slabs, which can be found in the following directory: C:\ProgramData\Autodesk\Structural Precast for Revit 2018\Families\en\Custom Slabs (Note – Swap out “2018” with whatever Revit Version you are working on) – Hollow Core Slab – Hollow Core Slab Strands Type1 Product: PCI Girder, RC-Plate, Voided Slab, Squarepile, Spunpile, Ugutter, Box Culvert, Readymix Status : Becakayu seksi 2D (13%), Becakayu seksi 1 (99. 17 254mm 1216 4 6 HOLLOWCORE 459kg/lm 4 SECTION 6. Cranes and other lifting equipment should be appropriately sized to handle the panels. Cracking can be the result of one or a combination of factors, such as drying shrinkage, thermal contraction, restraint We will continue to answer any questions regarding waterproofing; core-drilling through the slabs for wiring, pipes, flues, Center of web and void spacing. 1 Hollow-core unit 325 6 Composite Construction 335 6. They can be minimized to sub-blocks according to the design requirements. Paper dam can be any object to stop the flow of concrete into the void, i. 17- Block-out with Tied-in Lap-splice Bar (Joyce, 2014) . Voided Filigree Slab/Beam The elevated floors of the USB are a voided filigree system. 0 VOIDED SLAB DESIGN Se ction deck type: Prestressed slab of Β35 concrete with circular voids constructed by on site concrete. 07. Prestressed Voided Beams. 2 Benefits of Precast Structures 4 1. The precast link slabs were able to accommodate limited compressive strains, and the same tensile strain as the cast‐in‐place link slab. Hollow core precast concrete has continuous voids that run longitudinally throughout the planks. Flat-plate construction eliminates beams and drops, resulting in reduced floor-to-floor heights. 0. dgn: 02-20: PMBD: Precast Median Barrier Drain prestd07-20. 5C Precast Prestressed Slab - 15” Solid B5. Precast/Prestressed Slabs Beams (1960’s -1984) 37 Divide and create separate slabs from selected floor or floor faces by a predefined spacing and layout method. Diamond Grinding means altering the profile and texture of a concrete pavement surface by using grinding equipment that employs diamond tip blades. 65' Rapid Span w/ Concrete Deck for John Hancock @. we can do in family but profile will be straight and to cut it in curved profile in not working the palne of the slab is given belo Stresscrete Hollowcore is a 1200mm-wide extruded, prestressed, voided slab unit with a reinforced concrete topping. 0 Voided Slab Example 1. 5G Precast Prestressed Slab Details 11. They consist of two thin slabs and ribs connecting them, having the same or better performances than a solid slab, with less concrete used. Some voided-slab systems can reduce construction time, especially precast systems or those placed on flat-plate forming systems. Voided concrete slabs provide an open floor plate with fewer columns and no beams to limit design and ultimate use possibilities. newspaper. Figure 3. 2. Review load tables, details and specs of Spancrete precast hollowcore for use in specifications for an upcoming project. Roberts-Wollmann Ioannis Koutromanos May 5, 2014 Blacksburg, VA Voided within depth (flat soffit) - either using permanent void formers if cast on site, or formed in precast factory Voided soffit - either waffle slab (see top image) or ribbed/troughed The thermal performance of standard O’Reilly Hollowcore floor slabs is 25% better in average com- paring to the same slabs with open voids. Width Depth "D" PRECAST SUPERSTRUCTURE September 2006 Void Lockable Dowels improve site access, minimize formwork requirements and accelerate the rate of construction. Precast bridge girders are designed for shipping and handling stresses as well as for in-service loads. Feb 19, 2019 · The biaxial voided slabs are the latest one that are more efficient than traditional floor structure. The term ‘hollow core’ refers to cylindrical voids which run internally down the length of the precast slabs, thereby reducing the weight of the slab, typically by about 35 per cent. Schermer Construction, Inc. 3 Voided composite slab 320 5. 1 General and Technical Information General and Technical Information Safety Notes and Product Application In the continuous development of hardware for the precast industry, Dayton Superior places great emphasis on ensuring that material superstructures are solid slab units, voided slab units, and box beams. These PCE patented floor units offer spans of up to 18m, with pre-formed soffits and Create Family using Structural Framing Beam and Braces TemplateUse a CAD file to modify and Sketch extrusionSet visibility setting for medium and fine detail PPC overlay ( 9 psf) used for voided slabs and deck tee girders. = 1/3 x 2776 Kg. 1 General 324 5. Comprehensive Design Example for Prestressed Concrete. iii) Weight of central girder per m. The GT Slabs flooring solution from PCE Ltd minimises structural depth and does not require any onsite structural topping compared to other precast concrete systems: this results in a structural weight saving of approximately 3. Because of the mechanics in slab spans, engineers began to look for ways to remove the middle portion of the concrete while still keeping the slab intact. Beam bridges. 8. VOIDED SLAB DESIGN EXAMPLE_图文_百度文库 CONSPAN Version 4. Get contact details and address | ID: 11616140648 The signature interior design feature of the building is the precast void slab floor and ceiling system. 5. For precast prestressed multicell girders, live load shall be distributed according to AASHTO LRFD Tables 4. 4 Quality & Accuracy 6 1. Tri Deck bridge deck is an innovative engineered precast concrete slab used commonly in longer span bridge deck applications requiring a lower profile. 5F Precast Prestressed Slab - 26” B5. Voided slabs, using voids formed by permanent fillers or removable forms, have been used in reinforced concrete floor systems for more than 100 years. moment slab b el o w gu tte r l i n e (roadway item) subbase ase r euir d radway slo pe top and bottom barrier moment slab width top of pavement see sheet 6 for plan of c. The total thickness of the deck is 1,20 m. Vaignan, Dr S. All reinforcement used in manufacturing is multicycled steel. 5 νfcd Punching Shear Reinforcement Cl. Total Precast Buildings Mega Prefab will design and build your concrete and steel building. Manufacture. Hollow-core slab - Wikipedia, the free encyclopedia A hollow core slab, also known as a voided slab, hollow core plank or simply a This makes the slab much lighter than a massive solid concrete floor slab of Specially designed lattice girders provide support to the precast floor panel, until the in-situ concrete topping cures. 5kg are added for every 100mm of void fill 1216 284 284 305mm HOLLOWCORE SECTION 483k g/ 1m 10kg are added for every 100mm of void fill HO OWCOR s c ONS carj ESL SCA FIRE ALARM LAFARGE Precast floor slab and method for forming a flooring deck and building formed of precast floor slabs (11) EP 3 517 698 Al (22) 29. Unlike conventional rib and block slabs, the Cobute precast slab is an interlocking and modular system with three elements: precast lattice ribs, precast panels and polystyrene blocks. You can access tables from previous editions of the handbook as well as the current edition. Then there is the aggregate that is dug out and the trucks that have to carry it. Kevin Irons. 995 9. VOIDED SLAB DESIGN EXAMPLE_图文_百度文库 CONSPAN Version 4. Precast Slab Lid prestd05-20. 2m. Voided Slabs : Voided Slabs : Concrete Tech Voided Slabs Are A Precast Prestressed Slab For Bridge, Building, Marine Pier And Fish Passage Culvert Replacement Applications. The most outstanding advantage of the preparation of slabs in manufacturing plants is the increase in efficiency and higher quality control which may not be achieved on site. 4. In this method, the voids are assembled in steel cages and then concrete is poured to a height part way up the voids . Prestressed Solid Beams. 4. Get contact details and address | ID: 11616140648 Whether you want to replace a deficient structure, span a roadway or water, or create a tunnel, precast concrete bridge components provide the perfect solution. 0. Excellent sound-reducing qualities, durability and inherent fire resistance make our hollowcore slabs the solution of choice for apartments, care homes, hospitals and commercial projects. ST-Notes ST400 ST800 ST-Single ST-Dual ST2200 Constructed in 2018 by Hagar Enterprises, Inc. Building a Bridge with Voided or Solid Slabs? Precast, 28 day, f'c = 45 MPa; Precast, Initial, f'ci = 35 MPa; 5. Saccoman, Chairperson James Beerbower Ernest Markle Kevin Boyle James Markle Jeffrey Butler Milo J. 2 Design of prestressed beams in the beam-and-plank fl ooring system 325 5. Modern "voided slab" variations include systems entirely CIP and others using precast panels and thicker toppings to produce voided flat plate floors with smooth exposed soffits. That is good to know that post-tensioning tendons are set in slabs, and that helps it make it stronger. The manufacturing plant can produce individual slabs up to 3. Slab bridge decks are useful for short spans. 62 to 18. Precast, prestressed hollow-core slabs are usually used as part of a simple span system. A voided biaxial slab is created with the same capabilities as a solid slab, but with considerably less weight due to the elimination of superfluous concrete. B. Feb 19, 2019 · The biaxial voided slabs are the latest one that are more efficient than traditional floor structure. 4. All of our drafters are highly skilled professionals who possess many years of experience in the engineering field. ) d = mean effective depth of the slabs (mm) V v v u d Ed Ed Rd,max 0 β Max. Read about company. precast hollow core salb in curved profile HELLO FRDS, Please advice me how to model hollow core slab having curved profile . Spancrete hollowcore precast concrete planks & slabs are fire resistant, reduce weight and costs. If this limit of void depth is exceeded, the slab may behave more like a cellular deck. West Midnapore Dag No 1182, Kh No 212, Jl No 1219 Mauja-rupnaryanpur Po-jakpur West Medinipur, Kharagpur - 721301, Dist. In addition, there are advantages to be gained by prestressing when conditions are favorable to its use. 0 Voided Slab Example 1. Cast-in-place concrete is the preferred choice for concrete slabs and foundations, as well as components such as beams, columns, walls Oct 15, 2018 · Prestressed concrete slabs (including Inverted-Tee beams, Box beams and Voided slabs): All reinforcement including reinforcement in Virginia Adjacent Member Connections. 5B Precast Prestressed Slab - 15” Voided B5. dgn: 02-20: POD: Precast Overpass Drain prestd06-20. Custom Roof Slab. A recent composite construction of floors for buildings using thin precast plate and cast-in-situ concrete is presented. 39 Figure 3. S Means was used. Voided / Solid Slab Project Profiles. 6-A8-6 Slab Girder Framing Plan and Typical Section Tub Girders Hollow-core slabs, also known as voided slabs, initially appeared as one-way elements in Europe during the 1950s, and are still commonly manufactured in precast form for applications where fast construction and low self-weight are required. Projects specifying reduced floor vibration can benefit from voided-slab systems over metal deck floors. The Voided Floor Slab is a reinforced precast concrete slab which incorporates the cobiax void former syste. We excel in supplying common ODOT and WSDOT bridge members, and we specialize in custom, non-standard solutions for those projects where an alternate to the off-the-shelf slab or girder is required. The concept is simple: remove concrete mass from areas in the slab where it’s not needed to resist load. Solid & Voided Slabs Bridge Girders Overview Precast Concrete Frames Guide September 2003 Irish Precast Concrete Association Cumann Concréit Réamhtheilgthe na hÉireann Concrete Built is Better Built Contents Foreword 3 Overview 1. Timber/Earthen stairs to allow for water access. My husband worked in construction for a little bit, and he has been really curious about how they make some of the structures really strong. The width, depending on the production procedure, is up to 3 m, thickness of the concrete board is 80 - 120 mm. Prestressed or Precast Slabs. Reinforced concrete slab spans: All reinforcement. Precast Slab . T. All 2D member components (Subregion, Opening, Internal node, Internal edge, Intersection, Cut out) can be used together with voided slabs (existing feature of the slab). All reinforcement used in manufacturing is multicycled steel. F. Scon Infrastructure - Offering Voided Prestressed Concrete Slabs, For Industrial, Size: 10 X 15 Feet at Rs 1200/square meter in Thane, Maharashtra. i) Shear due to weight of deck slab and wearing course = 2 x ½ x 2. at the edge spans of 20m length and 1. where R. Fewer columns An initial layer of concrete, either cast-in-place or precast, prevents void buoyancy and firmly establishes void positioning. The voids are usually circular with the depth of voids generally restricted to sixty per cent of the depth of the slab so that the slab continues to behave like a single plate. VOIDED SLAB DESIGN EXAMPLE_图文_百度文库 CONSPAN Version 4. An economical design choice, it is the continuous voids in the hollowcore slab that reduce the weight of the building, and help to create plenty of design flexibility. Construction rates of 1 floors per week and better are often achieved. Add to cart. 856 63943 4865 4974 917 ALL UNITS IN INCHES EXCEPT WEIGHT All slabs are 48" wide 12 ” 5 ” 15 ” ” 8 ” 18” 10” 21 ” 15” 26” or voided slabs, BMI’s deck slabs are a precast, prestressed concrete product. Austral Deck is a exible solution designed to be installed with the entire range of Austral Precast Walling, Framework, Stairs and Balcony Solutions offering a complete precast building solution. A method May 20, 2017 · DIFFERENT TYPES OF VOIDED SLAB SYSTEM BUBBLE DECK -Bubble Deck is one brand of plastic void system which uses a precast filigree method to form voided slabs. 005 22208 2469 2466 728 21" VOID 757. voided slab system with post tension The I-voided biaxial slab system is created by using a recycled plastic formwork that was designed to lighten slabs and raft foundations. Downloads for products designed and engineered by Flood Precast Concrete. The equipment Founded in 1919 by two Royal Engineers who created the pillboxes used on the Western Front in the First World War, Bison Precast has come a long way. The main bottom floor reinforcement is contained within the precast concrete leaf. They are fast, effective and proficient with AutoCAD and BIM software. Standard unit depths are 200, 300 and 400mm. top of pavement see sheet 6 for plan of c. 16a. Cast-in-place concrete - Designing Buildings Wiki - Share your construction industry knowledge. Reinforced cover and landing slabs are an integral part of FP McCann’s tunnels and shafts product range, manufactured at the company’s specialist precast concrete facility. 2. Self-weight is taken by beam action alone unless beams are propped (or jacked) before slab is poured. For full functionality of this site it is necessary to enable JavaScript. 4m by 12m in size. e q. 2. The time saved by early removal of slab props can be significant. The formwork is not reusable and stays within the slab once cast with concrete. 45 x 0. VS-BG. The reduced weight of the floor slab using voided slabs allows a reduction in concrete and steel in floors, columns, and footings, saving money and reducing the total building weight, allowing lighter foundations. To know the advantages of precast concrete click here. (This functionality comes with the Structural Precast for Revit Update). If it can be imagined, concrete can help make it happen and there is a good chance voided concrete slabs will make it happen more flexibly. The resulting concrete is totally homogeneous with a uniform surface finish and is free of “bug” holes. 2d-1, 4. Cousins, Chair Carin L. W. Jun 16, 2017 · Precast Voided Floor Slab Precast Stairs and Landings All precast stairs and landings are designed and manufactured in reinforced concrete to suit the individual requirements of clients. Temporary supports are used to keep the slabs in the position until the connection with the columns has been achieved. 5 Speed of Construction & Buildability 7 1. dgn: 02-20: PAZD: Precast precast inverted T-beams and cast-in-place topping are intended to provide a higher degree of resiliency against reflective cracking and time dependent effects compared to voided slab and adjacent box girder systems. 2. Bubble Deck is one brand of plastic void system which uses a precast filigree method to form voided slabs. Once placed by the erection team the filigree plates are covered with in-situ concrete. moment slab (roadway item) subbase top and bottom e q. The UHPC product has about 52% of the concrete and less than 4% of the rebar, compared with This PDF excerpt from the PCI Bridge Design Manual, 3rd Edition, includes: APPENDIX B: AASHTO / PCI STANDARD PRODUCTS (Including: Solid and Voided Slab Beams; Box Beams; I-Beams; Bulb Tees; Deck Bulb Tees; Double Tee Beams; Standard Segment for Span-by-Span Construction; and Standard Segment for Balanced Cantilever Construction) APPENDIX C: PCI REGIONAL PRODUCTS (Including: NEXT D Beams; NEXT At Precast India, We have the capacities to manufacture slabs with varying thicknesses like 100mm, 120mm,150mm, 200, 250 and 270mm and soon to be launched, 350mm thick slabs for longer spans and higher load capacity! These Slabs are casted 120m long at a time, with a fixed width of 1. Precast concrete floor slabs are lifted from the ground up to the final height by lifting cranes. 70m at the rest spans. EVOS Slab System is a CME special biaxial, voided slab system developed and manufactured by Cobiax Middle East DMCC to cover the disadvantages of all previous voided slab systems by improving the concrete displacement, stability and rigidity of void formers, all of that enhance the uses of EVOS system in the construction site. Units are cut to a customised length and may have raking ends. Here are the instructions how to enable JavaScript in your web browser. 8 m to form exterior balconies. 3a-1 and 4. Buildings – Precast. hollow core slab, voided slab, hollow core plank, concrete plank (precast slab of prestressed concrete typically used in the construction of floors in multi-story buildings) Show declension of ontelolaatta. Design voided concrete slab and precast filigree panels under direct supervision of Structural Engineer experienced in design of this Work and licensed in State of California. Voided Slabs Generally Span 30' - 90'. This report examines the design process of plastic voided slabs. Add to cart. e. The excellent load-bearing capacity and structural efficiency allows you to build large areas with fewer partition walls. GMP Architecture LLC 's staff is knowledgeable with the Precast Industry. 283 7. For flat plate voided slabs, an additional load case must be con-sidered: a uniform load of 70 percent of the self-weight reduction must be applied over the entire slab surface FP McCann is one of the UK’s leading manufacturers of high-quality precast concrete floors. Apr 23, 2016 · 12. 40 Figure 3. i. shear stress at column face, = ≤ = 0. All of our drafters are highly skilled professionals who possess many years of experience in the engineering field. . p. precast voided slabs