AU607139B2

AU607139B2 - Hydraulic self climbing formwork

Info

Publication number: AU607139B2
Application number: AU73806/87A
Authority: AU
Inventors: Vic Warden
Original assignee: NU FORM ENGINEERING AUST Pty L
Current assignee: Waco Kwikform Pty Ltd
Priority date: 1986-06-03
Filing date: 1987-06-02
Publication date: 1991-02-28
Anticipated expiration: 2007-06-03
Also published as: AU7380687A

Description

4135-Pl PRT:JM 1181T.4 AUSTRAL IA PATENTS ACT 1952 COMPLETE SPECIFICATION

(ORIGINAL)

Application Number: Lodged: Complete Specification Lodged: Accepted: Published: Priority: Related Art: OFFICE USE 6071 39 '1ii t" cosLnsCtA TO BE COMPLETED BY APPLICANT :.Name of Applicant: 9 'OAddress of Applicant: 001 NU FORM ENGINEERING (AUST) PTY. LTD.

OLD CSR COMPLEX, DULTON AVENUE AND ALFRED STREET, CONCORD WEST, NEW SOUTH WALES, 2138 AUSTRAL IA VIC WARDEN ARTHUR S. CAVE CO.

Patent Trade Mark Attorneys Goldfields House 1 Alfred Street SYDNEY N.S.W. 2000 AUSTRAL IA 0, 00 4 90

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Complete Specification for the invention entitled HYDRAULIC SELF CLIMBING FORMWORK.

'The following statement is a full description of this invention including the best method of performing it known to me:- 1- ASC 4 9 1074F/NNG soft--

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i. i -r 0 04 00 The present invention relates to formwork for concrete structures, and in particularly, to a hydraulic self-climbing formwork.

In the building field, particularly in the construction of high-rise buildings, it is necessary to form high concrete structures, such as columns, lift shafts and walls. As it is only possible to pour a certain depth of concrete to allow for proper forming without bubbles and for correct curing, it is necessary that several pours of concrete be carried out, to produce tall concrete structures.

The problem associated with this type of construction is that, once a pour of concrete has been cured, for example, in building a concrete lift shaft, the formwork must be raised to its new position above the first pour so as to allow for the t next pour, and so on, until the required height of the lift shaft is produced.

In prior art systems this requires the formwork to be S dismantled by hand and carried to the next pour position, usually after allowing the full curing time for the concrete, C20 or by using a crane to raise an manoeuvre the formwork into position.

The present invention seeks to overcome these problems by providing a hydraulic self-climbing formwork.

In one broad form the invention comprises a hydraulic self-climbing formwork, adapted to be used in forming tall concrete structures, comprising: a formwork; a formwork support; o i 2 0356E ui .lj. i -i

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i i -i -1 if 1 a top cam box containing cam means; a bottom cam box containing cam means; a climbing post; and a hydraulic cylinder; wherein one of the cam boxes is connected to the formwork support and the formwork is connected by the formwork support, in a releasable manner, to the climbing post, and the hydraulic cylinder is connected between the two cam boxes, with the cam means of each of the cam boxes engaging with the climbing post, such that, with the cam means in a first position with the climbing post fixed in place, extension of the hydraulic cylinder lifts the formwork along the climbing post while, with the cam means in a second position with the formwork fixed in position, the climbing post is lifted by means of retraction of the hydraulic cylinder.

4I44 4 ,4 tcIn other forms the invention comprises a hydraulic ,II: self-climbing formwork, adapted to be used in forming tall concrete structures, comprising: a formwork; 20 a formwork support; 4, a top cam box containing cam means; a bottom cam box containing cam means; a climbing post; and a hydraulic cylinder; 2E wherein one of the cam boxes is connected to the formwork support and the formwork is connected by the formwork support, in a releasable manner, to the climbing post, and the hydraulic cylinder is connected between the two cam boxes, with the cam 1! Lj 3 0356E means of each of the cam boxes engaging with the climbing post, such that, with the cam means in a first position with the climbing post fixed in place, retraction of the hydraulic cylinder lifts the formwork along the climbing post while, with the cam means in a second position with the formwork fixed in position, the climbing post is lifted by means of extension of the hydraulic cylinder.

Preferably the cam means of each cam box comprises two cams. In the first position of the cam means, the first cam engages with the climbing post to raise the formwork, while the second cam is disengaged from the post. In the second position the second cam engages the post, to draw up the climbing post while the first cam is disengaged from the post.

In another embodiment perimeter safety screens and 0 walkways can be connected to the formwork support.

The invention will now be described by way of example with o o Q I ve** reference to the accompanying drawings, in which: 4 I Figures 1 to 7 illustrate stages in the use of a hydraulic self-climbing formwork of one embodiment of the present invention; Sii Figure 8 illustrates, in detail, the position of cams in another embodiment of the present invention during movement of the formwork; Figure 9 illustrates a similar view to that of Figure 8, showing the position of the cams for raising of the climbing post; Figure 10 illustrates a side elevation of a traveller of the embodiment illustrated in Figures 8 and 9; ii i

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Figures 11 and 12 illustrate, respectively a side elevation and a plan view of a cam box according to the embodiment illustrated in figures 8 and 9; and Figure 13 illustrates the shape of the cam according to the embodiment illustrated in Figures 8 and 9.

The steps of applying the invention, for example, forming a single free-standing wall or blade wall, are illustrated in Figures 1 to 7.

As shown in Figure 1, the formwork is erected in accordance with standard procedures, completing the normal functions of reinforcing, blackouts, plumbing, etc., and the concrete is poured. However, a formwork support or crawler mounting unit 1 is connected to the formwork shutter 2.

As shown in Figure 2, the climbing unit is connected to 0 9 o 1 the embodiment of the present invention by means of tiihe 0000 0 Q traveller 3 around the climbing post 4; which post is o a reinforced by an adjustable stay 5. The climbing post 4 and r its supports are levelled, and the weight taken by means of timber wedges under the climbing post base 6. A similar operation is carried out with respect to the other formwork te shutter. The concrete is poured and allowed to cure for approximately 12 hours. The ties 10 are then removed and, as shown in Figure 3, the shutter is jacked away from the fresh concrete using horizontal adjustment jacks 7. The cammeans in the lower cam box 13 is adjusted to the formwork lifting position, and the hydraulic cylinder 9 is extended, raising the traveller 3 and the formwork shutter 2 to the top position, where the top cam locks into place on the climbing post 4. The

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ii ii e 5 0356E -t hydraulic cylinder 9 is retracted to bring the unit to the position as shown in figure 3. Depending on the stroke of the hydraulic cylinder this operation may require several cycles of extension and retraction of the hydraulic cylinder to reach the position as shown in Figure 3. The formwork is cleaned and shutter release agent is applied, and the ties 10 are affixed in position. The procedure is repeated with the other formwork shutter, and the concrete is poured.

Once the concrete is cured for approximately 12 hours, the operation takes place as shown in Figure 4. The top and bottom cam boxes 8 and 13 respectively are set to the climbing post lifting position. The hydraulic cylinder 9 is retracted, raising the climbing post 4 to the position shown in the right-hand side of Figure 4. The bottom bracket 11 is then 0 0 113 affixed to the climbing post base, and the bottom bracket 11 is 4 a affixed to the first poured concrete by means of the ties 10 in Sthe concrete. Tue pour should be a minimum of 36 hours old.

a a oo A similar procedure is carried out with respect to the other formwork shutter and climbing post.

As shown in Figure 5, the shutter ties are removed and the I1Ir shutter is jacked away from the fresh concrete by means of the horizontal adjusting jack 7 and the cams are positioned into their shutter lifting position, and the hydraulic cylinder 9 is activated, raising the shutter to the position shown in the right of Figure 5. As can be seen, the first pour of concrete supports the hydraulic self-climbing formwork by means of the bottom bracket 11. The post is adjusted for correct level and is plumbed, and the shutter 2 is moved into its pouring -6-

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0356E _L P439v/NNG position. The procedure is then repeated with respect to the other shutter and climbing post, to arrive at the position shown in Figure 6.

The concrete is then poured and allowed to set. The bottom brackets are then disconnected and the post 4 and bottom brackets raised. The bottom bracket 11 is then affixed by ties to the next level of concrete, and the previous procedures are then repeated to arrive at the next stage, as shown in Figure 7.

The procedures, as shown in Figures 5, 6 and 7, are then repeated until the structure is complete.

As is shown the perimeter safety screens and walkways are connected to the crawler mounting unit 1 to be raised S simulaneously with the formwork shutter 2. A lower walkway 21 o is slung below the perimeter safety screens and walkway 20 to provide access to the bottom bracket 11.

oA detailed view oa one embodiment of the invention is pa p a° shown in Figure 8. As shown, the formwork shutter 2 is connected by any suitable means to the traveller 3 which rides along the climbing post 4 by means of a set of rollers of wheels 12. Connected to the traveller is the top cam box 8, °o which is connected by the hydraulic cylinder 9 to the bottom Go cam box 13.

The horizontal adjusting jack 7 can be of any suitable design.

The cam boxes each have two cams 14 and 15. The cam 14 is the shutter lifting position is disengaged from the post, while the cam 15 engages with one of slots 16 on the climbing post 4. The hydraulic cylinder 9 is connected at onO end to 7 LLL ~1 L q ~_I^II--IXI-.lliLF_ I 04 39 v/1NN o oo o 0 0000 P) i a 00 0 0 00 04 0 o 0 0 o 0 110 0004 O 0 0 00 0 1 01 the cam box 8 which is connected to the traveller 3. The ram end of the hydraulic cylinder 9 is connected to the bottom cam box 13 which is not connected to the traveller 3. Thus, when the hydraulic cylinder is extended, the cam 15 of the bottom cam box 13 bears against its adjacent protrusion 16, so that the traveller 3 and, hence, the formwork shutter 2 rises up the climbing post. At the full extension of the hydraulic cylinder 9 the top cam 15 engages within its adjacent slot 16 and the hydraulic cylinder is retracted, raising the bottom cam box 13, and the procedure is repeated until the formwork shutter 2 is raised to its correct position.

The operation for raising the climbing post is shown in Figure 9. The shutter 2 is still connected to the ties in the concrete structure and the bottom bracket (not shown) is disconnected fro the lower pours after the cams 14 have been swung in position to support the climbing post 4, with the cams moved to their non-engaging position, as shown. The hydraulic cylinder is retracted, with the cam 14 of the bottom cam box 13 supporting the weight of the climbing post on its adjacent protrusion 16. Thus, with the cam retracted, the bottom cam box 13 rises, lifting the climbing post. The hydraulic cylinder 9 is then extended, with the cam 14 of the top cam box 8 supporting the weight of the climbing post, and the hydraulic cylinder 9 retracted to lift the climbing post.

This operation is repeated until the climbing post has been raised to its correct next position, wherein the bottom brackets are connected to the appropriate lower pour of concrete and the process, as per Figures 5, 6, and 7, are 17

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i repeated.

An embodiment of the traveller 3 is as shown in Figure showing the position of the wheels 12 and the top cam box 8, with the operating lever 17 of the cam 15 shown.

As shown in Figures 11 and 12, a typical cam box is provided with two operating levers 17 and 18 for the various cams 15 and 14 located therein. As shown in Figure 12, respective cams are in a non-engaging position.

The cams themselves are made out of a plurality, of preferably five sections of the required profile, welded together. The section of this embodiment is as shown in Figure 13. The sections are welded together along the points 19 to provide an extremely strong cam, which is pivotally attached across the respective cam boxes, as shown in Figure 12.

a v i, 1 Embodiment of the present invention therefore provides a 0 8 b"e hydraulic self-climbing formwork which has the following S advantages, as compared to existing formwork: the shutters can be lifted, aligned and concreted daily; o the apparatus can be bolted to any shutter which uses scaffold tube or channel walers; t it can be used to build straight, curved or taper walls 4 t and structures; ll the bottom bracket can be bolted to concrete which is a minimum of 36 hours old; there is no requirement for the device, to be lifted in position by cranes, and cranes are only required for lifting the reinforced steel and concrete if required; the use of cranes can be eliminated in some cL-,es by using a builders 4

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9 L 0356E and perimeter safety screens on the climbing equipment; and the hydraulic system can work on low pressures.

It is therefore respectfully submitted that the present invention provides a novel system over that of the prior art, and it should be obvious to people skilled in the art that modifications or alterations can be made without departing from the scope or spirit of the present invention.

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Claims

1. A hydraulic self-climbing formwork, adapted to be used in forming tall concrete structures, comprising: a formwork; a formwork support; a top cam box containing cam means; a bottom cam box containing cam means; a climbing post; and a hydraulic cylinder; wherein one of the cam boxes is connected to the formwork support and the formwork is connected by the formwork support, in a releasable manner, to the climbing post, and the hydraulic cylinder is connected between the two cam boxes, with the cam means of each of the cam boxes engaging with the climbing post, such that, with the cam means in a first position with the climbing post fixed in place, extension of the hydraulic cylinder lifts the formwork along the climbing post while, with the cam means in a second position with the formwork fixed in position, the climbing post is lifted by means of retraction of the hydraulic cylinder.

2. A hydraulic self-climbing formwork, adapted to be used in forming tall concrete structures, comprising: a formwork; a formwork support; a top cam box containing cam means; a bottom cam box containing cam means; a climbing post; and a hydraulic cylinder;

9. c 0 *040 'toe I ti. 4 0I 49 4 9O 9P 999Q '4 *r o 94 *r 9 9* 14 1 i ri I I i1 11 0356E such that, with the cam means in a first position with t.e climbing post fixed in place, extension of the hydrauy,,: /2 I .96v/NNG 0 '3 00 0 00 03 00 *0 o '3 003 9 P 0 0 0u 0 0 0 wherein one of the cam boxes is connected to the formwork support and the formwork is connected by the formwork support, in a releasable manner, to the climbing post, and the hydraulic cylinder is connected between the two cam boxes, with the cam means of each of the cam boxes engaging with the climbing post, such that, with the cam means in a first position with the climbing post fixed in place, retraction of the hydraulic cylinder lifts the formwork along the climbing post while, with the cam means in a second position with the formwork fixed in position, the climbing post is lifted by means of extension of the hydraulic cylinder. 3. A hydraulic self-climbing formwork according to claim 1 or 2, wherein each cam box comprises tWo cams, in their operation positions each face in a substantially opposite direction to each other to engage one of a plurality of slots on the climbing post. 4. A hydraulic self-climbing formwork according to claim 3, wherein said formwork support comprises rollers or wheels which engage the surface of the climbing post. A hydraulic self-climbing formwork according to claim 3 or 4 wherein in the first position of the cam means, the first cam of one of the cam boxes engages onto the respective top of one of the said slots of the climbing post, while the second cam is disengaged from the slots, and in the second position of the cam means the second cam of the said one of the cam boxes engages under one of the slots of the climbing post, while the said first cam is disengaged from the projections. 6. A hydraulic self-climbing formwork support according to Si 12 *t i "1. .04'9V/N G any one of claims 3 to 5 wherein said cams are elonoated in shape and are pivoted from one end thereof, and having at the other end a shoulder which is adapted to engage in the slots of the climbing post. 7. A hydraulic self-climbing formwork according to claim 6 wherein said cams are formed of layer of metal of identical profile welded together. 8. A hydraulic self-climbing formwork substantially as hereinbefore described with reference to the accompanying drawings. DATED this 12th day of November, 1990. o o 0400 o0 NU-FORM ENGINEERING o (AULT.) PTY LIMITED o By Its Patent Attorneys o ARTHUR S. CAVE CO. o ~13 i