GB2067642A

GB2067642A - Construction device especially for supporting shuttering

Info

Publication number: GB2067642A
Application number: GB8000686A
Authority: GB
Original assignee: STEVELAND PRODUCTS AYLESHAM LT
Current assignee: STEVELAND PRODUCTS AYLESHAM LT
Priority date: 1980-01-09
Filing date: 1980-01-09
Publication date: 1981-07-30
Also published as: AU6609481A; JPS56142968A; EP0032417A1

Description

1

GB 2 067 642 A 1

SPECIFICATION

A construction device, especially for supporting shuttering

The present invention relates to a construction 5 device comprising a beam particularly suitable for use in formwork for moulding concrete but also suitable for other purposes.

Known construction beams for formwork are formed with a section hereinafter called "I" 10 section, having two flanges interconnected by a web, one of the flanges being in the form of a channel which surrounds on three sides a timber insert. This insert is provided so that shuttering - can be nailed to the beam. The section is normally 15 made of aluminium or steel.

Whilst such a known beam is excellent for simple straight formwork, it is not suitable when the formwork has to be curved or angled. The reason is that the "I" section cannot be bent more 20 than a very slight amount and the flanges of the "I" protrude from the central web to prevent one such beam from being bolted closely against another such beam so as to form an angle within the plane of the central web.

25 A construction device according to the invention comprises a beam including a metal section having two parallel walls interconnected by a web, and a timber insert located between the walls, each said wall presenting a substantially 30 planar exterior surface, said surfaces defining the extremities of the beam across its width.

Such a cross-sectional conformation of the beam enables one beam to lie flat on another and the one to be secured to the other by any suitable 35 means such as bolting or clamping, and the one beam can be angled to the other. Furthermore the simple conformation of the beam enables it to be placed between rolls and curved to a desired radius which has been found to be as small as 40 2 metres radius. In the case when the curvature is pronounced, it is preferable to provide two or even three thin timber inserts lying one on the other in a radial direction away from the centre of curvature. This enables the timber to take up the curvature 45 without cracking.

In a preferred embodiment of the invention the beam is formed of a standard box section with one narrow web partially cut away so that the timber insert is accessible. The beam may be provided 50 with holes at even spacing along its length both for interconnecting beams and also for fixing with a fixing means to strongbacks or soldiers.

The fixing means preferably comprises a yoke having two arms to embrace the webs of the 55 beam and having a hole through the arms to receive a bolt or pin, the yoke being connected to a threaded rod and nut to a saddle adapted to seat on a pair of strongbacks or soldiers so that on tightening the nut the saddle holds the beam 60 against the strongbacks or soldiers.

The invention will now be described, by way of example, with reference to the accompanying diagrammatic drawings in which: —

Figure 1 is a partially cut away perspective view

65 of a construction device according to the invention;

Figure 2 is a side view of the device of Figure 1;

Figure 3 is a side view of the construction device of Figures 1 and 2 showing its use for 70 angled formwork; and

Figure 4 is a side view of the construction device of Figures 1 and 2 showing its use for curved formwork.

In the drawings a construction device is shown 75 comprising a beam 1 and a fixing means or holdfast 2. The holdfast 2 clamps the beam 1 to a pair of strongbacks or soldiers 3, and shuttering 4 of the laminated wood or whatever is secured to the beam 1 by nails 5.

80 The beam 1 is preferably formed of steel, though aluminium or alloys could be used. The beam is conveniently formed from box section steel having two parallel long side webs 6 and an interconnecting portion or short side web 7. The 85 fourth side of the box section is milled away to provide two inwardly turned flanges 8 with a gap 10 in between. The gap 10 enables nails 5 to be hammered into a timber insert 12 which is forced longitudinally into the inside of the box section of 90 the beam. The timber is any suitable timber for nailing into such as pine or elm and although is not a primarily structural component may increase the beam strength by about 8%.

The timber insert 12 is shown as a single 95 member but if the beam 1 is to be curved radically the insert can be formed of three parts 13 indicated by broken lines 14 so that the parts lie one on the other in a radial direction away from the centre of curvature. This may be seen more 100 clearly in Figure 4.

Through the long side webs 6 of the beam holes are drilled to receive bolts 16 which secure the holdfast 2 to the beam 1. The holes can also be used to bolt one beam onto another as will be 105 described with reference to Figure 3. Instead of a bolt 16 other securing means such as a pin may be used.

The holdfast 2 comprises a yoke member or portion 18 are shown as welded to a threaded 110 rod 20 but which can be a separate member with a bolt replacing the rod 20. The rod 20 is passed through a saddle 22 and secured by a nut 24 so that on tightening the nut 24 the beam 1 is drawn against the soldiers 3. The yoke 18 preferably has 115 a gap 26 provided between it and the short web 7 so that the sides 28 of the arms 30 of the yoke lie snuggly between and separate the soldiers. The saddle 22 has flanges 32 preventing the soldiers from moving apart. In the case where the rod 20 is 120 replaced by a bolt, the gap 26 provides room for the bolt head.

In the case where formwork has to be provided to mould say a parapet of a bridge one beam 1 can be bolted to another as is shown in Figure 3. Here 125 beam 1' is bolted to beam 1" by a bolt 40, the two beams being firmly held at the correct angle by two plates 42. A pad 44 is provided where necessary. The holdfasts 2 and soldiers 3 are provided in the same manner as shown in Figures

2

GB 2 067 642 A 2

1 and 2. Shuttering 46 is nailed to beams 1' and 1" in the same manner as already described.

In the case where formwork has to be provided to mould say a curved wall, the beam 1shown in 40 5 Figure 4 is precurved to the correct radius between rolls. If the curvature is pronounced then the insert is in separate parts 13 as already described. The soldiers and holdfasts are as before. 45

10 It will be appreciated that the use of an essentially metal beam which can have nails driven into it is not limited to supporting shuttering, but can be used for any number of diverse uses in the construction or building 50

15 industry such as for decking beams for bridges,

staging, walkaways or for roofing purlins. Indeed the beams can be used to form the structural components for buildings.

Although the beam 1 is described as having 55

20 been formed from box section it is possible to form the beam from deep channel section without the flanges 8. However there are some problems in forming the necessary depth of channel.

Furthermore whilst the webs 6 of the beam are 60 25 described in the preferred embodiment as being planar it is possible that the exterior surface can be channeled provided that the surface is mostly in a single plane, that is sufficient so that two beams can be bolted with their webs 6 lying the 65 30 one on the other in a stable abutment.

Claims

1. A construction device comprising a beam including a metal section having two parallel walls 70 interconnected by a web, and a timber insert 35 located between the walls, each said wall presenting a substantially planar exterior surface.

said surfaces defining the extremities of the beam across its thickness.

2. A device according to Claim 1 wherein the section is, or is made of, a box section at least one part of a side of the section opposite to the web being absent to expose the adjacent face of the insert.

3. A device according to Claim 1 wherein the section is, or is made of, a channel section.

4. A device according to any one of the preceding claims wherein holes, passing through the walls and the insert, are distributed along the length of the beam.

5. A device according to Claim 4 further comprising fixing means including a yoke straddling the beam and having two perforated arms interconnected by a bridging element, the yoke being attached to the beam by a connector * passing through the perforations in the arms and one of said holes.

6. A device according to Claim 5 wherein the yoke is connected to a saddle by a threaded rod or bolt and nut.

7. A device according to Claim 6 wherein the saddle is substantially channel-shaped to embrace one or more strongbacks.

8. A device according to any one of Claims 5 to 7 wherein, when the yoke is attached to the beam, there is a substantial space between the bridging element and the web.

9. A device according to any one of the preceding claims where the insert is formed by layers of timber.

10. A construction device constructed,

arranged and adapted to operate substantially as herein described with reference to, and as shown in, the accompanying drawings.

Printed for Her Majesty's Stationery Office by the Courier Press, Leamington Spa, 1981. Published by the Patent Office, 25 Southampton Buildings, London, WC2A 1AY, from which copies may be obtained.

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