However, there are situations which are unique to hollow core slabs either because of the way the slabs are produced or because of the application of the slabs. This uniqueness manifests itself in a suite of benefits in structural quality, cost savings, safety, and more. Hollowcore slabs are available in a range of seven depths. Some hol low core producers are able to combine the ribbed. This comprehensive and easy to use resource has been divided up into the different project stages design approach, preplanning, preliminary design, final. High strength prestressing strands are cast into the planks at the spacing and location required for the given span, loading and fire cover conditions. Hbl has stateoftheart technology to offer precasted prestressed hollow core slabs with advanced extrusion technique. Hollowcore slabs are precast prestressed concrete elements extensively used for floor, roof slabs and wall panels. Sidesareformedeitherwithstationary, fixedformsorwithformsattachedtothemachine. A longitudinal voids through the one way reinforced concrete slabs are very important for utility services and for structural purposes by reducing the own weight of the structure. Lafarge precast concrete hollowcore slabs are produced at our edmonton facility, for the majority of projects the standard production process comprises of a combination of prestressed strand combined in the with the 8, 10 or 12 finished high strength concrete. At taracon precast, we know that having strong and durable flooring is critical to creating a successful building structure. Quality assurance of hollow core slab floors pdf 1992.
The precast extrusion machine provides the minimal 39 mm coverage. The size of these elements will typically range in width from 600 to 2400 mm, in thickness from 150 to 500 mm, and can be delivered in lengths of up to 24 m. The concrete distribution system has been supplied by marcantonini and consists of a 2 m. The 1989 design manual from pci fire committee provided some calculation. Each hollow core slab shall be inspected prior to delivery, and shall be clearly marked by the quality control inspector as approved for use in construction. Final year, department of civil engineering, bit durg. Feasibility of construction with hollowcore concrete slabs. Precast concrete hollow core floor slabs hollow core slabs are precast, prestressed concrete elements that are generally used for flooring. Tighter tolerances can be accommodated if required for special situations, but slabs will have a higher cost. Hollow core products can be designed, manufactured and installed by us, as a part of our commitment to providing an economical and total structural solution. In the load combinationstab combine the loads to the very right. Hollow core hc slabs are the most commonly used and economical precastprestressed concrete flooring system. Elematic is a machine extruded, precast, prestressed hollow core plank. Plans locating and defining all hollow core planks furnished by the manufacturer, with all major openings shown.
The prestressed hollow core slab is not a new prefabricated. Keep the dunnage accurately aligned from slab to slab. Hello, id like to contribute to this forum three excel sheets of my design, nothing too fancy but thats what im capable of the first is a singly reinforced concrete beam one layer. Production of extruded hollw core slabs lifting the slabs transport to the yard slab placement at the site 01 february 20 6 hollow core slabs hollow core slabs have a considerable flexibility. Hollowcore slabs are prestressed floor elements with voids. Hollowcore slabs from gulf precast are used horizontally in all type of structures such as villas, buildings, commercial and industrial structures, hotels, schools, shopping centers. The hollow core slab is manufactured in a standard 4 width and 8, 12, and 12. These types of slabs were analyze numerically by using nonlinear. Structural behaviour of hollowcore concrete slabs in ambient conditions 55.
The planks are cut to length for each project using. Maximum stockpile for 203 mm hollow core is 6 slabs, and for 305 mm is 4 slabs. Setting hollowcore slabs on bearing walls forms the necessary fire separation and. Hollow core technical sheets should be used for guidance only and consultation with hollow core concrete should be made prior to proceeding. As the heroes of flooring, roofing, bridges, and mezzanine systems, there are 7 main advantages of precast hollowcore slabs. Vme hollow core slabs have all the advantages of precast concrete. This paper provides a procedure for finite element analysis of hollow core slab floors, which may be necessary in case of large floor openings. Analysis and behavioral characteristics of hollowcore plank. The designers have greater flexibility because of the varying thickness 150 400 mm available and larger spans up to 18 meters can be obtained at costs which are lower than conventional flooring systems.
Coreslab manufactures of hollow coreslabs and related. Hollowcore slabs conform to the current edition of csa and cpci related standards. Spiroll hollowcore slabs, was used at botswanas first science and. Adobe acrobat reader is free and can be downloaded here. Coreslab the leading precast concrete specialist that operates in both privatesector project and publicsector infrastructure programme markets. Rational design of hollow core planks for fire resistance. Ultimately, this means greater freedom in design and architecture during and after construction as well as savings in material costs. 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. Hollowcore flooring is a precast prestressed concrete slab with tubular voids which run through the full length of the slab, thereby reducing the weight of the unit. The hollow core slab from vme precast, is of very high quality due to its excellent concrete compressive strength coupled with high tensile strength of steel strand.
In order to view pdf documents, you must have adobe acrobat reader installed. One limitation with hollow core slabs is that they can only have cores of equal size and. Anchor for prestressed hollow concrete slabs hollow core anchor easy steel, zinc plated range of loading. The following sections from the pci design handbook include interaction curves, load tables, and section properties for various precast concrete components. The batching plant was made by speco which is a korean company.
Masonite traditional primed 2panel square hollow core. A complete revision of the diaphragm chapter includes the latest design information. Failure state of reinforced and prestressed concrete hollowcore slabs as a result of a poor quality of precast elements chapter pdf available january 2010 with 3,542 reads how we measure reads. The underlying quality system has been established in accordance with iso 9001. Hollow core floors are used due to their lower cost and quick erection time. Jun 06, 2014 hollow core slabs are prestressed concrete elements that have a constant cross section. Pci manual for the design of hollow core slabs and walls. Formulas for homogenisation of the floor properties. Guide to good practice 30 pages, isbn 97818742660v. Builtin components such as electrical sockets, pipescables and openings etc.
The units themselves are manufactured at a width of 1200mm and depths of 150, 200, 250, and 300mm. Hollowcore is manufactured using long line extruders which form continuous cores running through the slabs. To understand the characteristics of frp lightweight concrete joining and the shear resisting mechanism. One of our trademarks is the inhouse manufacturing of precast hollowcore slabs. Hollow core anchor easy mkt metallkunststofftechnik. Mar 27, 20 introductionpurpose of manual the application and design of precast, prestressed hollow core slabs is similar to that of other prestressed members. Hollow core slabs are economical, have good fire resistance and sound insulation properties, and are capable of spanning long distances with relatively shallow depths. Jul 28, 2014 hollow core slabs provide considerable benefits to builders and house owners. Masonite traditional primed 2panel square hollow core molded composite slab door common. The voids of the hollow core can be used as conduit for installations. Chapter 9 guide specification for precast, prestressed hollow core slabs. The new system is a total precast concrete floor system that consists of continuous columns, prestressed rectangular beams, prestressed hollowcore planks.
Shear and torsion interaction of hollow core slabs holcotors technical report 1 finite element analyses of hollow core units subjected to shear and torsion december 2002 the content of the present publication is the sole responsibility of its publishers and in no way represents the view of the commission or its services. For 200 mm slabs and slabs with flat webs the overestimation was tens of percent. For additional explanations on using these tables, refer to the respective handbook editions. Mar 03, 2016 feasibility of construction with hollow core concrete slabs over r. Review of existing precast concrete gravity load floor. Mnl126 manual for the design of hollow core slabs free pdf. Van thuyne invests in a new hollow core factory echo precast. Standard widths are 48 inches and thickness of 8,10 and 12 inches. The excellent loadbearing capacity and structural efficiency allows you to build large areas with fewer partition walls. Hollowcore slabs with castinplace concrete toppings. Our prestressed hollowcore slabs, also called hollow core planks, concrete planks or voided slabs, are available in a variety of lengths and thicknesses. After the formation of the new state of chhattisgarh, several construction activities came up as a part of the infrastructural development scheme.
You can access tables from previous editions of the handbook as well as the current edition. Web shear failure in prestressed hollow core slabs matti pajari summary. The eurocode 2 method overestimated the mean shear resistance of all tested slab types. Thecores areformed withaugers ortubes with the concrete being compacted around the cores. They may even be used vertically, as wall panel partitions and cladding, in industrial structures or in boundary walls. Hollowcore slabs lajes alveolares machinery and equipment for hollow core slabs maquinas e. For roof slabs a span to depth ratio limit of 50 is suggested. When, 1 fire endurance, 2 openings, or 3 sustained live loads do not control the design. They are the ideal choice for constructing floors in individual homes, both at ground level and upper level. The january 1994 issue of underwriters laboratories, inc. Teemage hollowcore slabs are precast in the controlled environment of the factory away from the building site. Our prestressed hollowcore slabs are designed for use primarily as structural flooring components, however, they can also be used as roof deck components in buildings that have one or multiple levels.
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. Fire resistance of extruded hollowcore slabs dtu orbit. Details are available in both adobe acrobat reader pdf and cad dxf format. Setting hollowcore slabs on bearing walls forms the necessary fire separation and the perfect noise barrier. The primary purpose of these cores is to decrease by 40% to 50% the weight of the slabs, which leads to significant savings in the rest of the members of the building construction. Add a defining element to any space with the familiar design and timeless appeal of the masonite 2panel square hollow core interior door slab. Aug 17, 2018 this uniqueness manifests itself in a suite of benefits in structural quality, cost savings, safety, and more.
These slabs are of lesser weight and are used for quick erection and early completion of projects. This encon hollowcore building system design manual. Dxf files can be imported directly into many common cad programs. In safir it is possible to combine different types of element into one structure. For floor slabs a span to depth ratio limit of 45 is suggested. Common depths of prestressed hollow core slabs range from 6 to 10 in. Background level the ambient sound pressure level existing in a space. Zeroslump, highstrength concrete with a 28day strength in excess of 8,000 psi and. Hollowcore flooring technical manual 2003 hollowcore flooring is a technical manual covering the design and construction of projects utilising precast hollowcore flooring. They may even be used vertically, as wall panel partitions, in industrial structures or in boundary walls. The nonlinear analysis is conducted using the abaqus software and the results are expressed as a. Millions of square meters of hollowcore slabs are used every year in the building constructions all over the world villas, multistorey buildings, car parks, schools and shopping malls, etc.
Hollow core provides superior moisture control and protection from mold development and water. They are manufactured using high tensile strength prestressed strands or single wire which are embedded. Hollow core concrete slabs have many advantages over the conventional solid concrete slabs. Hollowcore residential applications county materials. Installation hollow core slabs are to be located and installed in accordance with expocrete drawing. As a first step the development of the world market for precast and precast machinery was checked to get an. Setting hollow core slabs on bearing walls forms the necessary fire separation and the perfect noise barrier. Hollowcore residential applications discover a homes hidden potential for additional space with hollowcore maximize space in any house plan with hollowcore roof and floor systems. 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. The slab serves as a ceiling for the lower level and creates a columnfree area that can be used for storage or as functional living space. Web shear failure is one of the numerous failure modes which have to be taken into account in the design of prestressed hollow core slabs. In this study, a numerical model about the shear behaviour of precast prestressed hollow core slabs is presented.
The economy of the generalized hollow core system is in the quantity of slabs that can be pro ducedatagiventimewithaminimumoflaborre quired. Hollow core slab vme precast precast concrete slab. In most cases, the slabs are cast on long line beds, normally 300 ft to 600 ft long. Dont use the shear design its not complete with aci 31814 the second is a hollow core pretensioned slab analys. 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. The equivalent thickness of the 200 mm 8 hollow core slab is 125 mm therefore exceeding the 124 mm minimum. Details hollowcoredetails hollowcore just click below to download a pdf or dwg detail. Resistance of prestressed hollow core slabs against web. Pci manual for the design of hollow core slabs second edition prepared for the pci hollow core slab producers committee. The produced elements have high load resistances thanks to a low watercement ratio of concrete from 0. Hollow core concrete slab is a versatile precast element. Hoogenboom delft university of technology, faculty of civil engineering and geosciences, delft, the netherlands this paper provides a procedure for finite element analysis of hollow core slab floors, which may be necessary in case of large floor openings.
In the early eighties it came out that the traditional design method which is still in eurocode 2, is on the unsafe side for numerous slab. Pdf this study presents investigation of the behavior of moderately thick reinforced concrete slabs having hollow cores with different parameters. Hollowcore slab benefits of using hollowcore floor slabs. The nemetschek group founded in 1963 more than 50 years in business 1,500,000 customers worldwide presence in 142 countries, international subsidiaries. Hollowcore slabs one of the most advanced precast products. The elements have a smooth lower surface with a highquality surface finish, in other words. We launched in 2008 to supply high quality precast concrete systems, including hollow core slabs, ribandblock slabs mainly to the residential property developments.
The use of precast concrete hollowcore flooring is a highly cost effective solution that fits easily into any structural system such as steel or concrete frame or indeed masonry construction. Hollow core floor slabs are designed and manufactured using a continuous formation method in accordance with the floor plan with indicated holes submitted by the client. To check the validity of the method, 49 shear tests on hollow core slabs with thickness 200. 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 dependent on the ultimate length requirement. Minimum end bearing is 75mm unless specified otherwise on drawings. Oneisadrycastorextrusionsystemwhereavery low slump concrete is forced through the machine. Pdf failure state of reinforced and prestressed concrete. Under the firetab there are a few settings the manual will explain. Pdf investigation of the behavior of reinforced concrete hollow. The flexural behavior of this type of slabs have not been investigated in detail in the past. Slabs are then sawcut to the appropriate length for the intended project. The success of this precast product is owing to the combination of.
From the initial concept through to its design and installation, hollow core offers a complete service which can be tailored to meet speci. Typical building floor construction utilizing hollow core planks. Hollow core slabs and wall elements without prestressed steel wire can be formed by extruders. Hollow core concrete concrete acoustic noise barriers. Hollow core slabs have minimal deformation even with high slenderness ratios due to the transversal load distribution and even when the elements do not have any concrete topping.
New precast concrete plant wall slab column girder weiler. More than 30 standard fire tests astm e119 have been conducted on hollow core floor assemblies. The end edge of slabs may be of geometric shape oblique or stepped sawing provided in the project. In time the concept of hollowcore slabs has covered at least 4.
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