GB2142948A

GB2142948A - Reinforced concrete floor

Info

Publication number: GB2142948A
Application number: GB08318216A
Authority: GB
Inventors: James Macgowan Fairgrieve
Original assignee: DOMAIN INTERNATIONAL Ltd
Current assignee: DOMAIN INTERNATIONAL Ltd
Priority date: 1983-07-05
Filing date: 1983-07-05
Publication date: 1985-01-30
Also published as: GB8318216D0; GB2142948B

Abstract

A plurality of side-by-side flat bottomed upwardly facing panel section members (10) are secured together side-by-side by bolts (16) and partially filled with a cast concrete layer (18). One side flange (13) of each channel is substantially deeper than the other flange and terminates in a horizontal flange (14) at its upper end with a down-turned lip (15) along its free edge to stiffen the flange and provide a base on which flooring (29) can be mounted. The gap between the concrete layer and the flooring provides a space for receiving services. <IMAGE>

Description

SPECIFICATION Improvements in or relating to floor construction This invention relates to floor constructions.

The invention provides a floor construction comprising a plurality of side-by-side channel section members secured together with the channel therein facing upwardly and downwardly facing undersides of the channels providing a generally smooth ceiling for the space below, at least one side of each channel having an upstanding side wall formed with a horizontal flange at the upper end thereof, a concrete layer cast in the channels to a level below the flange to provide, with the channel section members a rigid structure, and floor panels mounted on the horizontal flanges, the gap between the floor panels and concrete surface within the channels providing a space for receiving services.

The following is description of a specificembodi- ment of the invention, reference being made to the accompanying drawings in which: Figure 1 is a cut-away perspective view of part of a floor construction including a plurality of channel section members and an overlay of concrete; Figure 2 is a cross-sectional view through the floor construction of Figure 1 taken transversely to the channel section members; and Figure 3 is a cross-sectional view through the floor construction of Figure 1 taken along a channel section member.

Referring to the drawings, there is shown a floor construction comprising a plurality of side-by-side flat bottom upwardly facing channel section members 10which are pressed or rolled to shape. Each channel section member 10 has a base 11 with a shallow upstanding wall 12 along one edge thereof and a deep upstanding wall 13 extending along the other edge thereof. The deep wall 13 terminates at its upper end in a horizontal flange 14 formed with a down-turned lip 15 along its free edge to stiffen the flange.

The channel section members are arranged with the shallow flange 12 of one member abutting the deep flange 13 of the adjacent member and the flanges are secured together through preformed holes in the flanges by bolts 16, rivets, other mechanical fastening or spot welding. The arrangement is such that the base parts 10 of the channels are substantially flush with one another to provide a generally smooth ceiling surface for the space below the floor.

The parts of the deep flanges 13 lying above the adjacent short flanges 12 are formed with large diameter holes 17. Concrete 18 is cast in the channels which are stiff enough to carry the weight of the wet concrete before it has set. The concrete is cast to a level 19 below the flanges 14 of the side walls 13 but above the apertures 17 in the side walls so that the concrete forms a continuous cast layer between the channel sections through the apertures 17. Reinforcing rods 20 are mounted in the channel section extending lengthwise thereof and are tied to the laterally extending reinforcing rods 21 which pass through the apertures 17 in the side walls so that the reinforcement extends between the channel section members. Upper and lower reinforcing bars 21 are preferably provided lying at the top and bottom of the aperture 17 as best seen in Figures 2 and 3.The spaced longitudinally extending reinforcing bars 20 may be provided below the lower transverse bar 21 and a number (e.g. three as shown) of longitudinally extending upper bars 20 may be provided lying on the upper transverse bar 21. Suitable anchorages (not shown) in the form of long shank bolts or butterfly washers may be provided for the lower bars 20 in the sections and anchorages having the capacity to allow a full shear connection to be developed as necessary in a composite steel deck and concrete structure.

The composite channel section members/cast concrete layer thus provides a floor/ceiling structure in which the channel section members provide a permanent shuttering capable of supporting the wet concrete, reinforcement and construction loads during casting of the concrete and subsequently the channel section members combine structurally with the hardened concrete to form a composite reinforced concrete structure.

The flooring may be supported on transversely extending beams aiso of composite construction and comprising horizontally facing channel section members 22 the gap between the lower edges of which is covered by a bridging panel 23 and which are filled with cast concrete 24. Two sections of the flooring construction are joined over a beam with the respective ends of the floor construction spaced apart so that the concrete 24 of the beam can be cast simultaneously with that of the floors to provide a continuous casting through the beam and floors.

Moreover the beam is formed with internal longitudinal reinforcing bars 25 which are suspended by hangers 26 from the reinforcing bars 20 of the floor so that the reinforcement of the beam is tied in with that of the floors.

Strips 27 of an expanded polyethylene crosslinked, closed-cell sponge are mounted on the aforesaid flanges 14 of the channel section members to provide resilient seatings for tongue and groove or other construction floor panels 28. The floor panels 28 are thus supported above the surface 19 of the cast concrete layer and the resulting gap may be used to carry services such as cabling and pipe work as required. The floor panelling is provided with suitable removable panels 29 for access to the service space.

The resilient seating for the floor panelling may be provided in a variety of other materials such as a rubberised extruded material, bitumen impregnated fibre board, strips of carpet, semi-rigid polyurethane foam fused to timber battens, or bitumised foamed polyurethane strip.

The construction described above provides a simple and readily built celing/floor construction which can be built to the appropriate fire rating and load carrying capacity and can provide an acceptable panelled ceiling finish without any additional plastering or suspended ceiling. The resilient mountings for the floor panels limit the transmission of noise and vibration between floors. Additional reinforcing bars may be used to provide continuity reinforcement for continuous slabs add cantilevers with additional tensile reinforcement to act under fire conditions as required. A structural load testing and fire resistance testing may be carried out in accordance with BS.5950 Part 4, 1982 Sections 8 and 9 where required.

Claims

1. A floor construction comprising a plurality of side-by-side channel section members secured together with the channel therein facing upwardly and downwardly facing undersides of the channels providing a generally smooth ceiling for the space below, at least one side of each channel hacing an upstanding side wall formed with a horizontal flange at the upper end thereof, a concrete layer cast in the channels to a level below the flange to provide, with the channel section members a rigid structure, and floor panels mounted on the horizontal flanges, the gap between the floor panels and concrete surface within the channels providing a space for receiving services.

2. Afloor construction as claimed in claim 1 wherein the upstanding side walls of the channels are formed with apertures below the level to which the concrete is cast to provide continuity through the concrete between one channel and the next.

3. A floor construction as claimed in claim 1 or claim 2 wherein reinforcement bars are incorporated in the concrete layer cast in the channel sections.

4. A floor construction as claimed in claim 3 wherein a plurality of reinforcement bars extend longitudinally of the channel section member in the concrete layer cast therein to reinforce the layer.

5. A floor construction as claimed in claim 3 wherein a plurality of reinforcement bars extend longitudinally of the channel section member in the concrete layer cast therein to reinforce the layer.

6. A floor construction as claimed in any of claims 3 to 5 and in the case where apertures are formed in the upstanding side walls of the channels through which the concrete casting extends wherein reinforcement bars are cast in the concrete extend ing transversely to the channel section members through the apertures in the upstanding side walls thereof.

7. A floor construction as claimed in any of the preceding claims wherein the horizontal flanges on the upstanding walls have downturned lips along their free edges to stiffen the flanges.

8. A floor construction as claimed in any of the preceding claims wherein resilient pads are mounted on the horizontal flanges of the upstanding walls to cushion the floor panels.

9. A floor construction substantially as described with reference to and as illustrated in the accom panying drawings.