GB2145460A

GB2145460A - Device for the temporary attachment of fittings to a shuttering

Info

Publication number: GB2145460A
Application number: GB08421191A
Authority: GB
Inventors: Franz Hasberger
Original assignee: Rund Stahl Bau & Co GmbH; Rund Stahl Bau GmbH
Current assignee: Rund Stahl Bau & Co GmbH; Rund Stahl Bau GmbH
Priority date: 1983-08-25
Filing date: 1984-08-21
Publication date: 1985-03-27
Also published as: ATA303883A; GB8421191D0; GB2145460B; AT381548B; DE3430658A1

Abstract

Fittings such as tie rods, electrical sockets etc. to be embedded in concrete must be temporarily fixed to a shuttering. Fittings (9) of this type can be secured to a flat plate (1) which has a surrounding sealing strip (2). By sucking air out of a space enclosed by the shuttering (7) and the sealing strip (2) the plate (1) is held firmly on the shuttering (7). A suction line (4) leads from the inner cavity through the sealing strip (2) or through the plate (1) respectively to the outside for connection to a vacuum pump. <IMAGE>

Description

SPECIFICATION Device for the temporary attachment of installation members to a shuttering The invention relates to a device for the temporary attachment of installation members to a shuttering.

It is already known. in the case of shutterings preferably made from steel plate. for extraneous components. such as wood packings. electrical sockets etc. which are to be inserted. to be secured to the shuttering before pouring in the concrete. To this end.

magnets or suction cups are disposed on these extraneous components to be inserted.

In the case of the vibrators used in the concreting process. problems arise on account of the fact that the suctions cups secured merely by pressure do not resist these jolts produced by the vibrators.

Vacuum adhesion boxes are also already known. which are evacuated with the aid of a vacuum pump after attachment to the shuttering, so that they adhere to the shuttering for a prolonged period of time, at least until the concrete is poured into the shuttering. The installation components such as for example electrical switch boxes, moulding cores, moulding bodies, plug boxes, wooden inlet boxes etc., can be pressed on to these vacuum adhesion boxes. These vacuum adhesion boxes have valves which seal the closed vacuum chamber after the vacuum pump has been removed. Special valve designs are provided for this purpose.

It has been found in practice that, nevertheless, vacuum adhesion boxes of this type do not resist the stresses during the concreting procedure and the use of the vibrator. In addition, on account of their shape, vacuum adhesion boxes of this type are hardly suited to provide the widely differing fastening possibilities for installation members.

The object of the present invention is therefore to provide a device which is suitable for the assembly of parts formed and shaped in widely differing ways and which can be reliably secured to the shuttering during the entire concreting procedure.

According to the invention, there is provided a device for the temporary attachment of installation members to a shuttering, comprising an assembly nember in the form of a flat plate, a continuous resilient sealing strip secured to the assembly member and a suction line for sucking air out of a space enclosed by the shuttering and the sealing strip, the suction line being led from the space through the sealing strip or through the assembly member to the outside for connection to a vacuum pump.

Preferred and/or optional features of the invention are set forth in claims 2-10.

By virtue of the design of the assembly member as a flat plate an assembly surface is produced which allows the attachment of parts which have been formed and shaped in widely differing ways. Shuttering members for openings, plugs, tie rods or similar items can be secured to this flat plate.

By virtue of the design according to the invention it is possible to mount the plugs, tie rods, or the like on the assembly member, i.e.

the flat plate, before producing the vacuum, particularly if access to such components is difficult inside the shuttering. The assembly member is aligned and positioned on the shuttering wall and then an underpressure is applied by way of the suction line, as a result of which the device is secured to the shuttering. The underpressure can be reduced until the assembly member can no longer be detached, not even during the concreting process, particularly since the vacuum is maintained during the concreting process.

If the shuttering is filled, the vacuum pump, possibly only after the concrete has set, is switched off and the relatively small suction line, which leads through the concrete to the vacuum pump, is cut off.

After switching off, a possible connection by bolts or other fastening devices, by means of which the objects remaining inthe concrete are secured to the assembly member, can first of all be released, after which the complete device, comprising the assembly member and sealing strips, can be removed and used again. The inserted installation member is then positioned firmly in the concrete, precisely at the correct place, and can fulfil its function, for example as a support plug, for an opening.

The invention will now be more particularly described, by way of example, with reference to the accompanying drawings, in which: Fig. 1 is a front view of the embodiment of a device according to the invention viewed from the shuttering side; Fig. 2 is a side view of the device shown in Fig. 1, this being shown cut away in the region of a suction line; Fig. 3 is a partial side view of the device shown in Fig. 1, only the region ofthe suction line being shown; Fig. 4 shows the device of Figs. 1-3 in use on a shuttering; Fig. 5 is the front view of a further embodiment of a device according to the invention; Fig. 6 is the corresponding side view, partially cut away;; Fig. 7 is a sectional view through an edge of another embodiment of a device according to the invention, and Figs.8 and 9 show yet another embodiment of a device according to the invention in a manner of representation which corresponds to Figs. 1 and 3 and Figs. 5 and 6 respectively.

The device essentially comprises an assem bly member 1 and a continuous resilient sealing strip 2 disposed on the edge of the member 1. The assembly member 1 is in the form of a flat plate, the sealing strip 2 being vulcanized onto the edge region thereof so as to be closed about the periphery. A bore 3, which extends approximately parallel to the assembly member 1 or where appropriate is orientated at an acute angle thereto and in which is inserted a suction line 4, is provided in the sealing strip 2. An additional sealing and clamping ring 5 is advantageously inserted in the region of the said bore. Other means can also be used to secure the suction line to be inserted. It is clear from the view according to Fig. 3 that the said sealing and clamping ring can be formed as a rectangular component, this component then likewise being vulcanized into the sealing strip 2.A part which is welded to the assembly member 1 and which is vulcanized in, is also possible here.

The sealing strip 2 is made trapezoid in cross-section, the inner closure advantageously terminating at right angles with the flat plate of the assembly member 1 and the outer boundary forming an oblique closure surface 6. In this way, after the removal of the shuttering, the assembly member 1 can be removed from the concrete. The assembly member 1 in the form of a flat plate thus forms, together with the sealing strip 2 an element extending in a pyramidal manner towards the abutment surface of the shuttering 7.

The assembly member can be made from various materials, depending upon the purpose of application. As a rule it is formed from a bending-resistant steel plate. If adaptation to curvature of the shuttering is necessary, the assembly member can also be produced from a resiliently flexible material, it also being possible of course for a steel plate to be provided for this case of application. In the case of only slight curves which have practically no effect upon the breadth or length of a device of this type, the sealing strip 2 alone compensates such a curve.

The assembly member 1 is used to secure widely differing installation members, such as tie rods, plugs or the like. In the case of similar, multiply repeated installation members bores 8 can be provided in the assembly member 1 beforehand, in order to secure the parts in question In the case of the example of use according to Fig. 4 a threaded tie rod 9 for example can be secured in the concrete.

By means of suitable bolts 10 which are passed through the -bores 8, this tie rod 9 can be secured to the assembly member 1. The bores are sealed off. Other parts can also be secured to the assembly member 1 by means of bores of this type.

In the shuttering procedure, after the shuttering 7 has been set up, the device is prepared, by the parts in question, i.e. threaded tie rods 9 for example, being firmly secured to the assembly member 1 by bolts. The entire device is then held securely on the shuttering wall and the suction line 4 is connected to a vacuum pump. Distributing devices are also provided, which permit the connexion of a plurality of such devices to a common vacuum pump. The suction line 4 is simply led upwards and therefore outwards through the concreting section.

During the concreting and possibly until the setting of the concrete the underpressure in the chamber 11 enclosed by the assembly member, the sealing strip 2 and the shuttering 7 is maintained by the action of the vacuum pump. As soon as the concrete has set, the vacuum pump is switched off, since displacement of the device and also the firmly secured parts, i.e. the threaded tie rod 9 for example, is now no longer possible. After the removal of the shuttering the bolts 10 are free, so that they can be screwed out. The entire device, consisting of the assembly member 1 and the sealing strip 2, can be drawn out without difficulty. The oblique outer surfaces facilitate the removal. The device according to the invention is then ready again in the same way for further use. Only a new suction line 4 is inserted.

The assembly member 1, which is in the form of a flat plate, can be shaped in any manner, i.e. can be rectangular, circular, elliptical etc. The sealing strip 2 is mounted on the edge area of the assembly member 1, but can easily be set back with respect to the edge area. It would also be possible for this sealing strip 2 to always extend in a circular manner, even if for example the assembly member 1 is in the form of a rectangular plate.

The sealing strip 2 is approximately between 0.5 and 2.0 cm thick, depending upon requirements.

In the embodiment shown in Figs. 5 and 6 two sealing strips 2 and 2' extending parallel to one another are provided at the edges. The sealing of the bolt 10 off from the tie rod 9 is rendered unnecessary by this arrangement.

The suction line 4 opens into the space 11 bounded by the two sealing strips 2 and 2' extending parallel to one another.

A further advantageous embodiment is illustrated in Fig. 7. The sealing strip 2, which in this case too is disposed on the edge of the assembly member 1, comprises a channelshaped groove 12 into which the suction line 4 opens. In this case too the sealing of the bolt connexion for holding the tie rod 9 is rendered unnecessary.

Finally Figs. 8 and 9 show a sealing strip 2 which surrounds a surface which is considerably smaller than the surface of the assembly member 1. The bores 8 for receiving the fastening bolts 10 are disposed outside the space defined by the sealing strip 2 and need not therefore be sealed here. In order to prevent the ingress of concrete from the side, an additional sealing strip 20, which is used to keep free from concrete the section opposite the shuttering wall 7 and covered by the assembly member 1, is disposed on the edge of the assembly member 1.

By means of the steps according to the invention the design of the assembly member as a flat plate provides an optimum fastening ability for the widely differing parts, which should be secured in a concrete member, and on the other hand adequately prevents displacement of the inserted parts during the concreting procedure and during the setting.

Claims

1. A device for the temporary attachment of installation members to a shuttering, comprising an assembly member in the form of a flat plate, a continuous resilient sealing strip secured to the assembly member and a suction line for sucking air out of a space enclosed by the shuttering and the sealing strip, the suction line being led from the space through the sealing strip or through the assembly member to the outside for connection to a vacuum pump.

2. A device according to Claim 1, wherein the resilient sealing strip is disposed on the edge of the assembly member and sealable bores for securing installation members, tie rods, plugs and the like by fastening members are provided in the assembly member.

3. A device according to Claim 1 or claim 2, wherein the surface of the sealing strip provided to bear against the shuttering extends essentially parallel to the plane of the assembly member.

4. A device according to any one of Claims 1-3, the outer boundary surface of the sealing strip extends at an angle to the assembly member.

5. A device according to Claim 1, wherein two spaced apart sealing strips disposed parallel to one another are provided on the assembly member (1), and the suction line opens into the interspace bounded by these two sealing strips.

6. A device according to Claim 1, wherein the sealing strip has, its surface provided for abutment with the shuttering, a channel-like depression into which the suction line opens.

7. A device according to Claim 1, wherein the sealing strip closed on the periphery confines a surface which is only a fraction of the surface of the assembly member and the sealing strip is disposed substantially in the centre of the assembly member and the suction line is passed through the assembly member and a further sealing strip is disposed on the edge of the assembly member.

8. A device according to any one of the preceding Claims, wherein the assembly member is formed from a bending-resistant steel plate.

9. A device according to any one of claims 1-7, characterized in that the assembly member is produced from a flexible, preferably resiliently flexible material, in order to adapt to the curvature of the shuttering.

10. A device according to any one of the preceding Claims, wherein the suction line is inserted in a bore of the sealing strip or the assembly member respectively, and an additional sealing and/or clamping sleeve is inserted in the bore.

11. A device for the temporary attachment of installation members to a shuttering, substantially as hereinbefore described with reference to, and as shown in, Figs. 1-4, 5 8 6, 7, or 8 s 9 of the accompanying drawings.