GB2263497A - Climbing formwork - Google Patents

Abstract

A climbing formwork arrangement includes a horizontal platform (2), a support arrangement (9) pivotally mounted on the platform and extending substantially vertically, an arm (10) extending forwardly from the upper end of the support and a formwork panel (13) suspended from the forward end of the arm. The entire support is moved pivotally relative to the platform to move the formwork panel from an operative position to an inoperative position. The lower end of the vertical part of the support is provided with a horizontally extending arm (8), the forward end of which is pivotally connected to the platform. <IMAGE>

Description

Title: "Improvements in or relating to climbing formwork" Description of the invention It has been proposed previously to provide a climbing formwork system which consists of a platform adapted to extend substantially horizontally on which is slideably mounted, for horizontal movement, a framework which supports a formwork panel. The formwork is supported by shoes which run along rails provided in the panels. The shoes may be driven by elongate threaded shafts lying in the rails, engaging threaded bores provided in the shoes.

The platform may be located in an initial position and the formwork may be advanced horizontally to a position that it is to occupy during the pouring of concrete. After the concrete has been poured and at least partially cured the supporting framework may be moved horizontally to withdraw the formwork from the concrete. The platform, still supporting the framework and the formwork panel may then be lifted, for example, by a crane, to a higher position and it may be clamped to the structure that has just been built. The formwork may then be advanced to the position that it is to occupy during a subsequent pouring step.

Prior proposed climbing formwork assemblies have involved the use of a relatively strong, and thus bulky and expensive mechanism to move the formwork panel horizontally.

One disadvantage with this system is that the rails, and the mechanism, may become at least partially covered in cement or concrete during the pouring process. This cement may significantly hinder the desired subsequent operation of the mechanism. The present invention seeks to provide an improved climbing formwork assembly.

According to the invention there is provided a climbing formwork arrangement, the arrangement comprising substantially horizontal platform, a substantially vertically extending support pivotally connected to the platform, an arm extending from the upper end of the support and in turn supporting a formwork panel, pivotal movement of the support serving to move the formwork panel from an operative position to an inoperative position.

Preferably the lower end of the support is provided with a substantially horizontally extending arm which is pivotally connected to the platform.

Conveniently a channel is provided on the platform adapted to receive the said horizontal extending arm.

Advantageously the said support arm pivotally connected to the top of the said support.

Preferably one end of the arm is connected to the support by a jack or other element of adjustable length.

Conveniently the jack comprises a double screw-jack.

Advantageously the formwork panel is pivotally connected to a forward end of the said support arm.

Preferably the vertical support is associated with a jack or other element of adjustable length connected between a point mounted on the vertical support and a point mounted on the platform, in order to effect the said pivoting movement of the vertical support.

The formwork assembly may be in the form of a climbing formwork assembly.

In order that the invention may be more readily understood, and so that further features thereof may be appreciated, the invention will now be described by way of example, with reference to the accompanying drawings in which: FIGURE 1 is a side view of a climbing formwork assembly in accordance with the invention with a formwork panel in an operative position for the pouring of concrete, and FIGURE 2 is a view corresponding to Figure 1 showing the formwork panel in a retracted or inoperative position.

Referring initially to Figure 1 of the accompanying drawings a climbing formwork assembly 1 comprises a horizontally extending platform 2 which is associated with appropriate supporting struts 3 located beneath the platform. The platform is intended to be clamped in position on a part fabricated wall 4.

At the edge of the platform remote from the wall-is a protective barrier rail 5.

Mounted on the platform are at least two horizontally extending channels 6 only one of which is shown in Figure 1. Pivotally connected to the forward end of the channel by means of a pivot point 7, is a lower substantially horizontal arm 8 which extends from a substantially vertically extending support 9. At the top of the support 9 there is provided a pivotally mounted load bearing support arm 10. The support arm 10 is pivoted about a pivot point 11. The support arm 10 is provided, at a point above the pivot point 7, with a further pivotal connection 12 between the support arm 10 and a formwork panel 13. The formwork panel 13 supports, at its upper edge, a platform 14. The rearward end of the support arm 10 is connected, by means of a double screw-jack 15 to a connection plate 16 which is provided on the support 9.The connection plate 16 is also connected by means of another double screwjack 17 to an anchor point 18 located adjacent the channel 6.

Each double screw jack consisting of two terminal threaded rods, having opposite handed threads, the ends of which are connected to the connection points, the rods are secured in threaded bores provided at the ends of a hollow sphere. By rotating the sleeve the rods can be driven in or out of the sleeve (depending on the direction of rotation) thus moving the connection points together or apart.

It is to be appreciated that Figure 1 illustrates the formwork in an operative position, with the formwork panel 13 substantially coaligned with the prefabricated wall 4 so that concrete may be poured into the space 19 adjacent the form. This space 19 will, of course, be bounded not only by the formwork panel 14 but by some opposing formwork which may comprise another formwork assembly such as that illustrated in Figure 1.

When the concrete is at least partially cured, the formwork panel 13 is to be moved away from the cured concrete in the space 19. This is effected by operating the double screw-jack 17. The central tubular portion of the jack is rotated, thus drawing the threaded rods provided at the ends of the screw-jack into the central part of the screw-jack. This causes the support 9 to move, with a pivotal action about the pivot point 7. The lower support 8 is received into the channel 6 and the formwork assembly then occupies the position illustrated in Figure 2. The entire climbing formwork assembly may then be craned to a higher height and the procedure may be repeated. The upper screwjack 15 may be utilised to effect a vertical positioning of the formwork panel 13, if desired.

It will be appreciated that the described formwork arrangement does not involve horizontal tracks and associated screw threads driving carriages along the tracks, and thus the arrangement is lighter and less prone to being clogged by stray cement or concrete.

While the described embodiment of the invention has double screw jacks, other elements of adjustable length may be used in the place of the double screw jacks.

Claims (11)

CLAIMS:

1. A climbing formwork arrangement, the arrangement comprising substantially horizontal platform, a substantially vertically extending support pivotally connected to the platform, an arm extending from the upper end of the support and in turn supporting a formwork panel, pivotal movement of the support serving to move the formwork panel from an operative position to an inoperative position.

2. A formwork assembly according to Claim 1 wherein the lower end of the support is provided with a substantially horizontally extending arm which is pivotally connected to the platform.

3. A formwork system according to Claim 1 or Claim 2 wherein a channel is provided on the platform adapted to receive the said horizontal extending arm.

4. A formwork system according to any one of the preceding claims wherein the said support arm is pivotally connected to the top of the said support.

5. A formwork system according to Claim 4 wherein one end of the arm is connected to the support by a jack or other element of adjustable length.

6. A formwork system according to Claim 5 wherein the jack comprises a double screw-jack.

7. A formwork assembly according to any one of the preceding claims wherein the formwork panel is pivotally connected to a forward end of the said support arm.

8. A formwork assembly according to any one of the preceding claims wherein the vertical support is associated with a jack or other element of adjustable length connected between a point mounted on the vertical support and a point mounted on the platform, in order to effect the said pivoting movement of the vertical support.

9. A formwork assembly according to any one of the preceding claims in the form of a climbing formwork assembly.

10. A formwork assembly substantially as hereinbefore described with reference- to and ais ithe accompanying drawings.

11. Any novel feature of combination of features disclosed herein.

11. Any novel feature of combination of features disclosed herein.

Amendments to the claims have been filed as follows CLAIMS: 1. A climbing formwork arrangement, the arrangement comprising substantially horizontal platform, a substantially vertically extending support pivotally connected to the platform, a support arm extending from the upper end of the support and in turn supporting a formwork panel, pivotal movement of the support serving to move the formwork panel from an operative position to an inoperative position.

2. A formwork assembly according to Claim 1 wherein the lower end of the support is provided with a substantially horizontally extending foot which is pivotally connected to the platform.

3. A formwork system according to Claim 1 or Claim 2 wherein a channel is provided on the platform adapted to receive the said horizontal extending foot.

4. A formwork system according to any one of the preceding claims wherein the said support arm is pivotally connected to the top of the said support.

5. A formwork system according to Claim 4 wherein one end of the support arm is connected to the support by a jack or other element of adjustable length.

6. A formwork system according to Claim 5 wherein the jack comprises a double screw-jack.

7. A formwork assembly according to any one of the preceding claims wherein the formwork panel is pivotally connected to a forward end of the said support arm.

8. A formwork assembly according to any one of the preceding claims wherein the vertical support is associated with a jack or other element of adjustable length connected between a point mounted on the vertical support and a point mounted on the platform, in order to effect the said pivoting movement of the vertical support.

9. A formwork assembly according to any one of the preceding claims in the form of a climbing formwork assembly.

10. A formwork assembly substantially as hereinbefore described with reference to and a shown in the accompanying drawings.