Hollowcore Floor Bearing Details
5Pages

Issued by: CF 13/08/13 Approved by: DA 13/08/13 Reference: HCS-01 Page: Bison Precast Flooring Specification Floor types: This specification covers the design, manufacture and associated site work for manufacture the following floor types types; • • • Hollow core floors Composite h hollow core floors Solid composite floors omposite Manufacturing Ltd Engineering Department Precast concrete floors are designed and manufactured as prestressed precast units which when assembled and joints filled with concrete provide a one one-way spanning floor plate plate. Hollow core units are nominally 1200mm wide, of rectangular cross section with a series of longitudinal cores through the section to provide a weight saving to improve structural performance performance. Composite Hollow Core floors consist of the same units but the load capacity of the finished floor is enhanced by the provision of a structural concrete topping which is cast on site. Solid Composite floors consist of solid prestressed planks without cores and with a structural topping which is cast on site. Standards: All materials and finished products are to be designed to approved standards set down in the contract, the appropriate British Standards, and this specification. Concrete: The compressive strength classes generally used in the design and manufacture of the units are as follows: follows:- The compressive strength at 28 days is C45/55 The concrete strength at transfer is C25/30. oncrete Admixture: Only a admixture complying with BS EN 934-2 may be included in the an 2 concrete. Reinforcement: Reinforcement is generally 5mm diameter high tensile wire or 12.5mm h strand complying with the requirements of BS 5896. Code: Unless otherwise agreed the design of Bison units is in accordance with the requirements he and recommendations of BS 8110:1997 “ “The Structural Use of Concrete” Service Class: The design of Bison units is to BS 8110 Serviceability classification, Class 3 with a limiting crack width of 0.1mm. Design to other classifications is as agreed in the contract. contract Durability: The standard B Bison hollow core slab is designed to comply with the durability ollow requirements of BS 8500.

Issued by: CF 13/08/13 Approved by: DA 13/08/13 Reference: HCS-01 Page: Bison Precast Flooring Specification Manufacturing Ltd Engineering Department Fire: Fire resistance is based upon the tabulated data contained within BS 8110: Part 2, Section 4. Sections are available for fire periods of 1 hour or 2 hours without additional finishes. These periods without of fire resistance may be further enhanced by the application of appropriate finishes. Sound: The requirements of the Building Regulation and details of compliance are contained in a Regulations separate data sheet, which can be...

Issued by: CF 13/08/13 Approved by: DA 13/08/13 Reference: HCS-01 Page: Bison Precast Flooring Specification Manufacturing Ltd Engineering Department camber will vary between adjacent un and can give rise to a “piano key” effect. It maybe possible units to reduce the camber between units by loading prior to the joint between the units being grouted. the 4.06 Finishes: Unless stated in Bison’s quotation, concrete surface finish to soffit is a Type A finish as concrete described in clause 6.2.7.3 of BS8110:1997. The standard of finish referred to is as per the sample panels located at our...

Issued by: CF 13/08/13 Approved by: DA 13/08/13 Reference: HCS-01 Page: Bison Precast Flooring Specification Manufacturing Ltd Engineering Department Notching: Where slabs are notched around stanchions or similar obstructions, these will be of rough appearance (see also clause 4.10) Unless expressly stated in Bison’s quotation, any resultant 4.10). r infilling between slab and stanchions, columns or similar obstructions within the depth of the slab is en to be carried out by others. Anti-Crack Provision: It is recommended that a light mesh reinforcement be provided by others in the insitu...

Issued by: CF 13/08/13 Approved by: DA 13/08/13 Reference: HCS-01 Page: Bison Precast Flooring Specification Manufacturing Ltd Engineering Department Soffit fixings: We do not cast timber battens into the soffit of our units. Several fast and cost effective proprietary systems are available for direct fixing to concrete and we shall be pleased to provide details on request. QUALITY MANAGEMENT SYSTEM Quality Assurance. Reference: All Bison manufacturing facilities are members of the B.S.I. . B.S.I Registered Firm Scheme for Quality Assurance to BS EN ISO 9001:2008 for the design, design...