GB1589480A

GB1589480A - Floors

Info

Publication number: GB1589480A
Application number: GB1058077A
Authority: GB
Original assignee: Tinsley Building Products Ltd
Current assignee: Tinsley Building Products Ltd
Priority date: 1978-05-22
Filing date: 1978-05-22
Publication date: 1981-05-13

Description

(54) IMPROVEMENTS IN OR RELATING TO FLOORS (71) We, TINSLEY BUILDING PRODUCTS LIMITED, a British Company of 169 West Street, Glasgow G2 2LA, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- This invention relates to floors of reinforced concrete and has for its object the construction of reinforced concrete floors without the need of removable shuttering and adaptable for large spans.

According to the present invention, a reinforced concrete floor comprises lattice girders in laterally spaced relationship, panel material secured to and extending between the undersides of the lattice girders and comprising wire mesh adapted to serve as permanent shuttering, and concrete in-fill to a level above the panel material at least equal to the depth of the lattice girders.

A known type of lattice girder suitable for incorporation in the above floor construction comprises inverted V-members welded at their ends and their apices to connecting rods, and a known type of panel material is of cardboard reinforced with a first series of parallel wires on one side and with a second series of parallel wires, at right angles to the first series, on the other side, the cardboard being apertured at the wire crossings and the crossing wires being welded together through the apertures. Other forms of panel material such as expanded metal or wire mesh or wire netting can be used so long as the mesh size is fine enough to support the concrete in-fill thereon to the required level. The cardboard or fine mesh affords a plasterable soffit for a readily finished ceiling.

The panel material may be secured to the undersides of the lattice girders by welding, but may alternatively be secured thereto by twists of wire or by clips (which may be fitted manually or by means of a simple tool) so that no welding equipment is needed other than may be required in the factory where the lattice girders and the wire mesh are made.

The lattice girders may be spaced apart by more than their own width and additional reinforcing rods provided between and parallel to the lattice girders. With the lattice girders in direct contact with the panel material the additional reinforcing rods are preferably spaced from the panel material, as by providing rods at right angles through the lattice girders and in between the panel material and the additional reinforcing rods, but the lattice girders and the additional reinforcing rods may all be spaced from the panel material, as by welded mesh or by rods at right angles to the lattice girders or by lengths of perforated material (e.g. bent strips of slotted metal of channel or delta section).

Additional reinforcing rods may be provided inside the lattice girders and/or at right angles through the lattice girders, at any level but preferably closer to the panel material than to the parts of the lattice girders remote from the panel material.

Means may be provided between the lattice girders for forming voids in the concrete, so that large span floors do not become too heavy, especially if of increased depth. The means for forming voids may be expanded plastics (e.g. polystyrene), inflated bags or tubes (which may serve to form ducts for services, such as cables, pipes, or air for heating or conditioning) or formers of arch section made of metal and, even of the panel material, possibly stiffened by pre-spraying with concrete or mortar.

Additional wire mesh may be provided above the lattice girders to reinforce the upper surface of the concrete.

Four embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings, in which: Figure 1 is a broken perspective view of part of a reinforced concrete floor in accordance with the invention; Figure 2 corresponds to part of Figure 1 but shows a modification thereof; Figure 3 is a broken perspective view of part of another reinforced concrete floor in accordance with the invention; and Figure 4 corresponds to part of Figure 3 but shows a modification thereof.

In the Figures, a reinforced concrete floor comprises lattice girders 1 in laterally spaced relationship, panel material 2 secured to and extending between the undersides of the lattice girders and comprising wire mesh adapted (as will be described presently) to serve as permanent shuttering, concrete infill 3 to a level above the panel material ex ceding the depth of the lattice girders, and a plastcred soffit 4.Each lattice girder 2 compriscs inverted V-members 5 welded at their ends and apices to connecting rods 6, while the panel material 2 is of cardboard 7 reinforced with a first series of parallel wires 8 on one side and with a second series of parallel wires 9, at right angles to the first series, on the other side, the cardboard being apertured with slots 10 embracing the wire crossings, and the crossing wires being welded together through the apertures.

In Figure 1 the girders 1 are spaced apart by more than their own width and additional reinforcing rods 11 are provided between and parallel to the girders. The lattice girders 1 arc in direct contact with the panel material 2, but the additional reinforcing rods 11 are spaced from the panel material, as by providing rods 12 at right angles through the lattice girders and in between the panel material and the additional reinforcing rods.

In Figure 2 the modifications as compared with Figure 1 are that the rods 12 are replaced by bent strips 13 of slotted metal of delta section and further reinforcing rods 14 (only one shown) extend within and parallel to the girders.

In Figures 3 and 4 like numerals represent like parts to those shown in Figures 1 and 2.

One difference, however, is that the lattice girders 1 are spaced from the panel material 2 by welded mesh 15 having one series of wires 16 parallel to the girders and another series of wires 17 at right angles thereto.

Also, in Figure 3, expanded plastics 18 (e.g., polystyrene) and, in Figure 4, formers 19 of arch section made of the same panel material are provided between the lattice girders 1 for forming voids in the concrete 3, so that large span floors do not become too heavy, especially if of increased depth.

The panel material 2 may be secured to the underside of the lattice girders 1 (Figures 1 and 2) or to the welded mesh 15 (Figures 3 and 4) by welding, or by twists of wire (not shown) or by clips (also not shown and which may be fitted manually or by means of a simple tool) so that no welding equipment is needed other than may be required in the factory where the lattice girders 1, panel material 2 and welded mesh 15 are made. Likewise, the rods 12 or bent strips 13 may be secured to the lattice girders 1 by twists of wire or by clips, and the additional reinforcing rods 11 (or the further reinforcing rods 14) may be secured to the rods 12 or bent strips 13 by twists of wire or by clips.

WHAT WE CLAIM IS: 1. A reinforced concrete floor comprising lattice girders in laterally spaced relationship, panel material secured to and extending between the undersides of the lattice girders and comprising wire mesh adapted to serve as permanent shuttering, and concrete infill to a level above the panel material at least equal to the depth of the lattice girders.

2. A reinforced concrete floor as in Claim 1, wherein each lattice girders comprises inverted V-members welded at their ends and their apices to connecting rods, and the panel material is of cardboard reinforced with a first series of parallel wires on one side and with a second series of parallel wires, at right angles to the first series on the other side, the cardboard being apertured at the wire crossings and the crossing wires being welded together through the apertures.

3. A reinforced concrete floor as in Claim 1 or Claim 2, wherein the panel material is secured to the undersides of the lattice girders by welding.

4. A reinforced concrete floor as in Claim 1 or Claim 2, wherein the panel material is secured to the undersides of the lattice girders by twists of wire or by clips.

5. A reinforced concrete floor as in any one of the preceding Claims, wherein the lattice girders are spaced apart by more than their own width and additional reinforcing rods provided between and parallel to the lattice girders.

6. A reinforced concrete floor as in Claim 5, wherein the lattice girders are in direct contact with the panel material and the additional reinforcing rods are spaced from the panel material.

7. A reinforced concrete floor as in Claim 6, wherein the additional reinforcing rods are spaced from the panel material by providing rods at right angles through the lattice girders and in between the panel material and the additional reinforcing rods.

8. A reinforced concrete floor as in Claim 5, wherein the lattice girders and the additional reinforcing rods are all spaced from the panel material by welding mesh.

9. A reinforced concrete floor as in Claim 5, wherein the lattice girders and the additional reinforcing rods are all spaced from the panel material by rods at right angles to the lattice girders.

10. A reinforced concrete floor as in Claim 5, wherein the lattice girders and the additional reinforcing rods are all spaced from the panel material by lengths of perforated material.

**WARNING** end of DESC field may overlap start of CLMS **.

Claims

**WARNING** start of CLMS field may overlap end of DESC **. part of another reinforced concrete floor in accordance with the invention; and Figure 4 corresponds to part of Figure 3 but shows a modification thereof. In the Figures, a reinforced concrete floor comprises lattice girders 1 in laterally spaced relationship, panel material 2 secured to and extending between the undersides of the lattice girders and comprising wire mesh adapted (as will be described presently) to serve as permanent shuttering, concrete infill 3 to a level above the panel material ex ceding the depth of the lattice girders, and a plastcred soffit 4.Each lattice girder 2 compriscs inverted V-members 5 welded at their ends and apices to connecting rods 6, while the panel material 2 is of cardboard 7 reinforced with a first series of parallel wires 8 on one side and with a second series of parallel wires 9, at right angles to the first series, on the other side, the cardboard being apertured with slots 10 embracing the wire crossings, and the crossing wires being welded together through the apertures. In Figure 1 the girders 1 are spaced apart by more than their own width and additional reinforcing rods 11 are provided between and parallel to the girders. The lattice girders 1 arc in direct contact with the panel material 2, but the additional reinforcing rods 11 are spaced from the panel material, as by providing rods 12 at right angles through the lattice girders and in between the panel material and the additional reinforcing rods. In Figure 2 the modifications as compared with Figure 1 are that the rods 12 are replaced by bent strips 13 of slotted metal of delta section and further reinforcing rods 14 (only one shown) extend within and parallel to the girders. In Figures 3 and 4 like numerals represent like parts to those shown in Figures 1 and 2. One difference, however, is that the lattice girders 1 are spaced from the panel material 2 by welded mesh 15 having one series of wires 16 parallel to the girders and another series of wires 17 at right angles thereto. Also, in Figure 3, expanded plastics 18 (e.g., polystyrene) and, in Figure 4, formers 19 of arch section made of the same panel material are provided between the lattice girders 1 for forming voids in the concrete 3, so that large span floors do not become too heavy, especially if of increased depth. The panel material 2 may be secured to the underside of the lattice girders 1 (Figures 1 and 2) or to the welded mesh 15 (Figures 3 and 4) by welding, or by twists of wire (not shown) or by clips (also not shown and which may be fitted manually or by means of a simple tool) so that no welding equipment is needed other than may be required in the factory where the lattice girders 1, panel material 2 and welded mesh 15 are made. Likewise, the rods 12 or bent strips 13 may be secured to the lattice girders 1 by twists of wire or by clips, and the additional reinforcing rods 11 (or the further reinforcing rods 14) may be secured to the rods 12 or bent strips 13 by twists of wire or by clips. WHAT WE CLAIM IS:

1. A reinforced concrete floor comprising lattice girders in laterally spaced relationship, panel material secured to and extending between the undersides of the lattice girders and comprising wire mesh adapted to serve as permanent shuttering, and concrete infill to a level above the panel material at least equal to the depth of the lattice girders.

11. A reinforced concrete floor as in

Claim 10, wherein the lengths of perforated material are bent strips of slotted metal of channel or delta section.

12. A reinforced concrete floor as in any one of the preceding Claims, wherein additional reinforcing rods are provided inside the lattice girders.

13. A reinforced concrete floor as in any one of the preceding Claims, wherein additional reinforcing rods are provided at right angles through the lattice girders.

14. A reinforced concrete floor as in Claim 12 or Claim 13, wherein the additional reinforcing rods are closer to the panel material than to the parts of the lattice girders remote from the panel material.

15. A reinforced concrete floor as in any one of the preceding Claims, wherein means are provided between the lattice girders for forming voids in the concrete.

16. A reinforced concrete floor as in Claim 15, wherein the means for forming voids are expanded plastics, inflated bags or tubes or formers of arch section made of metal.

17. A reinforced concrete floor as in Claim 16, wherein formers of arch section are made of the panel material.

18. A reinforced concrete floor as in any one of the preceding Claims, wherein additional wire mesh is provided above the lattice girders to reinforce the upper surface of the concrete.

19. A reinforced concrete floor substantially as hereinbefore described with reference to any one of Figures 1 to 4 of the accompanying drawings.