Hollow core advantages and applications banu mukhtar. 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 multistory apartment buildings. Hollow core slabs weight up to 50% less than conventional cast insitu slab of the same size resulting considerable saving in construction cost. Troubleshooting precast cracks in hollowcore slabs t. With the benefit of prestressing and low self weight, longer spans can be achieved for the same loads or greater loads for the same depths. Common depths of prestressed hollowcore slabs range from 6 to 10 in. The stc is a measure in decibels of the ease at which airborne sound is transmitted through a floor system. Prepared for the pci hollow core slab producers committee john e. Hollowcore is primarily used as a floor and roof deck system and hollowore has many innate qualities such as being durable, noncombustible, mold and mildew proof, along with providing acoustical and vibration dampening.
Precast concrete is highly fireresistant and an excellent material for compartmentalization as it slows the. This uniqueness manifests itself in a suite of benefits in structural quality, cost savings, safety, and more. Web shear strengthening technique of deep precast prestressed. Design analysis of prestressed hollow core slabs on flexible. Installation hollow core slabs are to be located and installed in accordance with expocrete drawing. Precast concrete hollow core production edition 1 november 2008 installation of hollow core floor slabs uab betonika, naglio 4a, lt52367 kaunas. Plans locating and defining all hollow core planks furnished by the manufacturer with all castin openings shown and located.
Drawing labels, details, and other text information extracted from the cad file translated from spanish. As with the stc, the higher iic values are more desirable. The planks are cut to length for each project using. Hollow core slab properties prop imperial metric a 235. The hollow core slab is manufactured in a standard 4 width and 8, 12, and 12. Minimum end bearing is 75mm unless specified otherwise on drawings. Details hollowcoredetails hollowcore just click below to download a pdf or dwg detail. Maximize space in any house plan with hollowcore roof and floor systems. Comparision of behaviour of hollow core slab building and solid slab building for different seismic zones keeping the member size same for all models. Item detail mnl126 manual for the design of hollow core slabs. Our hollowcore slabs continue to help accelerate and mitigate risks on projects. Effect of hole diameter on ultimate bearing capacity of.
Pci manual for the design of hollow core slabs and walls. Elematic is a machine extruded, precast, prestressed hollow core plank. Hollow core slabs are prestressed, precast concrete slabs, with hollow portions in the regions of zero stresses. The hollow core slab has a variety of uses, including floors and roofs for buildings. One of our trademarks is the inhouse manufacturing of precast hollowcore slabs.
These slabs which are made of highstrength concrete are pre. It is generally used in the construction of floors for highrise apartments or multi storey buildings. We are known for the very high standard of our slabs that are manufactured at our factory in polokwane using spiroll extrusion technology from the united kingdom. The voids in each slab usually have a diameter that is equal to approximately 23 to 34 of the slab section, while the thickness of each plank is. Run the numbers and estimate your next project in oldcastle precast hollowcore plank. It is primarily used as a floor and roof deck system. A floor consisting of jointed hollow core slabs provides a monolithic slab structure. Also enclosed are sample specifications and a set of typical general notes.
Hollowcore ipha international prestressed hollowcore. The equivalent thickness of the 200 mm 8 hollow core slab is 125 mm therefore exceeding the 124 mm minimum. Create a hollow core type family revit products 2018. Hollowcore commercial applications county materials.
As with the stc the higher iic values are more desirable refer to the pci design handbook application. How the hollow core slabs are transported to site and installed. Pdf the application and design of precast, prestressed hollow core slabs is similar to that of other prestressed members. Bolted connections under hollowcore slabs, steel beam connections in concrete wall gaskets, concrete wall connections in hollowedout slabs, concrete wall connections in gaskets of hollow slabs, steel beam. Use of precast hollow core slabs in high rise buildings. Hollow core slab properties prop imperial metric a 290. This system of construction is very famous in belgium where it is widely used in private house projects. Hollow core slabs are precast, prestressed concrete elements that are generally used for flooring. Discover a homes hidden potential for additional space with hollowcore. Tel 37 400 100 2 gripping the slab in all width fig. Hollow core slabs are cast usingvariousmethodsinthesevenmajorsystems availabletoday. Hollow core spans 50 feet plus continuous installation minimizing down time on site for other trades proper coordination and quick installation allows for a fastpaced.
Specimens where the core fill concrete remained composite with the slab concrete following webshear failure had the highest webshear strengths, which indicated that bond between the core fill concrete and slab concrete is a critical factor in the shear strength of hollowcore slabs with filled cores. Design of structural connections bjorn engstrom chalmers university of technology goteborg, sweden. Sizes and locations of these openings are to be provided to the manufacturer by the respective trades. Full operation of precast hollow core slab machine shuangli building materials equipment co. Hollowcore is an extruded prestressed concrete slab with continuous voids to reduce weight and cost. Hollowcore flooring technical manual 2003 hollowcore flooring is a technical manual covering the design and construction of projects utilising precast hollowcore flooring. This dynamic cad model can be used in your structural design cad drawings. A hollow core slab refers to a precast slab that is prepared using prestressed concrete. A complete revision of the diaphragm chapter includes the latest design information. Hollowcore residential applications county materials. No matter what the type of design, encons hollowcore. Sometimes the hollow core slab is not prestressed in such cases they are made on carousel production lines which are directly made of the exact length as required.
Standard widths are 48 inches and thickness of 8,10 and 12 inches. Also, the effect of hollow core hole diameter on the volume of concrete placing, weight of the slab and consequently, of the entire structure, as well as the cost of construction and finally, the ultimate bearing capacity of hollow core slabs is a fundamental issue that seems inevitable. Pdf design analysis of prestressed hollow core slabs on. Manual for the design of hollow core slabs second edition by donald r. Pci manual for the design of hollow core slabs and walls iii. Shear capacity of hollowcore slabs with concrete filled cores. Savings in cost and time will keep your project on time and under budget. Continuous voids in the planks reduce their overall weight and help keep building costs in check. Hollowcore was originally conceived and developed as south africas alternative to insitu cast concrete floor panels for multistorey buildings some 25 years ago.
Hollow core slabs precast india infrastructures pvt. Pdf design analysis of prestressed hollow core slabs on flexible. Construction load tables colony precast concrete llc. The questionnaire depicted different types of cracks and requested respondents to list the causes, prevention, and effect on serviceability. Our objectives are to promote the use of prestressed hollowcore in the global construction market, helping our members to stay at the forefront of their industry. The length of such a slab is limited to 7 to 8 meters. High strength prestressing strands are cast into the planks at the spacing and location required for the given span, loading and fire cover conditions. The slab has been especially popular in countries where the emphasis of home construction has been on precast concrete, including. Check out the various load charts designed by the team at colonial precast concrete llc. This comprehensive and easy to use resource has been divided up into the different project stages design approach, preplanning, preliminary design, final. As more residential covenants dictate restrictions, hollowcore helps home owners gain more usable space. Ultraspan is a machineextruded, precast, prestressed hollowcore plank.
Bt ontelolaatastojen yhteiset suunnitteluohjeet pdf, p. Pdf simple method for modelling hollowcore concrete slabs. Pdf design aids for precast ordinary reinforced and prestressed. Review load tables, details and specs of spancrete precast hollowcore for use in specifications for an upcoming project. Pci manual for the design of hollow core slabs and walls, 3rd edition free pdf download mnl12615 this manual presents in detail design of hollow core slabs for gravity and lateral loads. Our prestressed hollowcore slabs, also called hollow core planks, concrete planks or voided slabs, are available in a variety of lengths and thicknesses.
Hollowcore is produced in 8inch, 12inch and 16inch thicknesses with 4foot being the standard width. Precast hollow core salb in curved profile autodesk community. Indicate locations and details of anchorage devices to be embedded in or attached to structure or other construction. Economical and efficient flooring and roofing system. In todays world of innovation and fasttracking, the hollowcore floor slab is a viable and in many instances, preferable alternative to more conventional building methods.
Download load tables for spancrete hollowcore in the following categories. To obtain a higher slab thickness, normal carbonate concrete field topping can be added to gain a higher total slab thickness. Bolted connections under hollowcore slabs, steel beam. The international prestressed hollowcore association is a notforprofit organisation, founded in 1969. Hollowcore gets its strength from pretensioned steel strands that are embedded in high strength concrete. Hollowcore slabs with castinplace concrete toppings. A hollow core slab is a precast, prestressing concrete member with continuous voids being provided to reduce weight and cost. Title \\server\ hollow core \cameron\brochure pages\brochure details hollow core model 1 author. Mnl126 manual for the design of hollow core slabs free pdf. Sections and details showing connections, edge conditions, and support conditions of the hollow core planks. Specimens where the core fill concrete remained composite with the slab concrete following webshear failure had the highest webshear strengths, which indicated that bond between the core fill concrete and slab concrete is a critical factor in the shear strength of hollow core slabs with filled cores. Architectural resources and product information for hollow core sheets including cad drawings, specs, bim, 3d models, brochures and more, free to download. In order to view pdf documents, you must have adobe acrobat reader installed.
As the heroes of flooring, roofing, bridges, and mezzanine systems, there are 7 main advantages of precast hollowcore slabs. The concrete hollow core slabs have between four and six longitudinal cores running through them, the primary purpose of the cores being to decrease the weight, and material within the floor, yet maintain maximal strength. Pdf very often, in the design process of buildings, the storey height is an essential problem for the investor and architect. Download this free 2d cad block of a dynamic hollow core concrete block. Installation hollowcore slabs are to be located and installed in accordance with expocrete drawing. Dxf files can be imported directly into many common cad programs. The precast extrusion machine provides the minimal 39 mm coverage.
Zeroslump, highstrength concrete with a 28day strength in excess of 8,000 psi and. Hollowcore slab dwg detail for autocad designs cad. The third edition of the manual has added hollow core wall panels and is updated to aci 31811, pci 7th edition design handbook and 2012 ibc. Hollow core slabs provide economical and efficient floor and roof system for various reasons. Plans locating and defining all hollowcore planks furnished by the manufacturer, with all major openings shown.
Thermal mass effect thermal mass is a property that enables precast concrete floors to absorb, store, and later release significant amounts of heat. Comparision of quantity of concrete and quantity of steel for. Voids do not update when the width of the hollow core slab is modified. Manual for quality control for plants and production of precast and prestressed. The thermal performance of standard oreilly hollowcore floor slabs is 25% better in average com paring to the same slabs with open voids. Saccoman, chairperson james beerbower ernest markle kevin boyle james markle jeffrey butler milo j. The position of the webs in the hollow core slabs is indicated by dashed lines. An understanding of the methods used to manufacturehollowcoreslabswillaidinthespecial considerations sometimes requiredin theuse of hollow core slabs. Hollow core sheets cad drawings, designs and 3d models.
Adobe acrobat reader is free and can be downloaded here. Details are available in both adobe acrobat reader pdf and cad dxf format. Keep the dunnage accurately aligned from slab to slab. A structural topping can increase that up to a 4hour rating. This bundle contains all 32 pcirecommended hollowcore details. Other topping materials such as gypcrete can be added to achieve a fire endurance using different tables. Create extra living and storage space by using a homes entire footprint, even neglected space available under a garage, porch or stoop. Hollowcore is very economical and provides great design flexibility. Each type of crack is given a generic name and a brief description. Hollowcore slabs are economical, have good fire resistance and sound insulation properties, and are capable of spanning long distances with relatively shallow depths. This encon hollowcore building system design manual has been designed to illustrate the many ways in. Pci manual for the design of hollow core slabs and walls, 3rd edition free pdf download mnl12615.
1409 1277 339 515 1251 1424 683 154 1102 1596 653 343 1407 686 216 1585 362 316 1308 1414 958 905 1141 949 322 1267 1357 107 1262 1395 879 1262 1420 654 1481 604 307 1174 98 1379 619 1371 1032 1245 1085