AU6559600A

AU6559600A - Method for the production of high, large diameter towers in sliding molding

Info

Publication number: AU6559600A
Application number: AU65596/00A
Authority: AU
Inventors: Richard Lienbacher; Hermann Theil
Original assignee: GLEITBAU GmbH; Ed Zueblin AG
Current assignee: GLEITBAU Ges mbH; Ed Zueblin AG
Priority date: 1999-07-23
Filing date: 2000-06-29
Publication date: 2001-02-13
Anticipated expiration: 2020-06-29
Also published as: ES2259850A1; AU761901B2; WO2001007731A1; ES2259850B1

Description

28-09-2001 EP0006053 DESCRIPTION Title Method for the production of the towers of upwind power stations by means of a sliding moulding Technical area The invention concerns the production of high towers of upwind power stations with large diameters which contain several reinforcements to stabilise them against wind and earthquake loads. State-of-art It is known to construct high, hollow towers of reinforced concrete whose cross-section is constant over their height by means of sliding mouldings which are pulled continuously and produce walls without joints. As the towers have thin shells, they are reinforced internally to stabilise them against deformation under wind load. Because of technological constraints the reinforcements are built in afterwards. This creates an unstable situation for the free wall section under construction. With high towers of large diameter there is furthermore the risk of deformation of the sliding moulding by loads which act eccentrically (e.g. from lifting equipment) as well from dynamic pressure/suction as a result of which the concreted wall varies from the required geometric form, the stress ratios change uncontrollably and the stability problems are increased drastically. It is known from DE-OS 17 09 306 how to stabilise sliding mouldings against deformation by means of radially arranged beams. It is furthermore known from FR-A-2 117 737 to temporarily integrate the reinforced concrete top reinforcement which is subject to compressive stress and later in the completed tower protects the shell against deformations, during the sliding process as reinforcement of the sliding moulding into the sliding moulding construction and to connect this top reinforcement to the finished concrete wall after the tower has reached its final height. Then again it is known from US 3 355 853 to construct a building by means of the sliding moulding method and to achieve this, use a sliding moulding which is stiffened by what is to become the roof of the building. The floors, stacked on top of one another and manufactured with a separating layer between them, are lifted as a packet when the wall construction has reached sufficient height, to the designed height of the bottom floor and the bottom slab of the packet is anchored to the walls constructed. In the meantime the sliding moulding stiffened by the roof slab produces new wall to which, after reaching sufficient height and lifting of the remaining packet of floor slabs, the second-lowest floor slab is attached etc. Very high towers with relatively thin shells are known from projects for upwind power stations. The natural draught caused by temperature variations drives wind turbines for power generation. 1 AMENDED PAGE 28-09-2001 EP0006053 These planned towers with a height from 200 to 1,000 m have a diameter of 50 to 150 m. The wall thicknesses taper from ca. 100 cm in the lower area to 18 cm below the crown. The relatively thin shell must be protected against bulging. However, the stiffening must not impede the air flow. The known solutions therefore propose pressure rings with radial bracing. The pressure ring is made of welded steel plate box section and is concreted over after attachment to the concrete wall. Similar to the spoked wheel of a bicycle, the spokes are only subjected to tensile force and when made of steel therefore have a small cross-section. This construction method is known from DE 196 21 514 A 1. Purpose of the invention It is the purpose of the invention to create a safe method for the true-to-form construction of the high, large-diameter towers of upwind power stations simultaneously providing stability during construction and simplification of the installation of the permanent reinforcement. Presentation of the invention Its stated purpose is achieved by the features mentioned in the characteristic part of the procedural claim 1 and the device claim 6. To this end the invention proposes to temporarily attach the sliding moulding surrounding the tower to what is to become the top reinforcement of the tower, a horizontal spoked wheel with spokes only subjected to tensile force. The spoked wheel then slides along until its permanent attachment to the wall and so protects the free shell against bulging. The lower reinforcing spoked wheels are stacked on top of each other and lifted as a packet using the top spoked wheel, integrated into the sliding moulding, as a base. After the sliding moulding has passed the designed height of the bottom spoked wheel plus the total height of the intermediate spoked wheels, the packet of spoked wheels is lifted up and the bottom wheel permanently attached to the wall as the first reinforcement ring. The spoked wheels stacked on top of it are detached for the next lift and stay until the sliding moulding has passed the next reinforcement height and the lifting process is repeated. The spoked wheel integrated into the moulding remains as top edge reinforcement and can be used for a circular gangway, aircraft navigation beacons, protection against lightning and the like. Short description of the drawings Using the 630 m high stack of an upwind power station of 70 m diameter as an example the essential design features and functioning are explained below. The figures referred to below are only diagrams. Fig. 1 gives a sectional view of an upwind power station with 4 reinforcements (3) in the tower 2 AMENDED PAGE 28-09-2001 EP0006053 Figures 2 A to E show in a diagrammatic and exemplary form the construction process for a tower with only three reinforcements. Fig.3 gives a more detailed sectional view of the upper part of the wall constructed (1), the sliding moulding (5) with the attached spoked-wheel type reinforcement (3). Fig. 4 is a top view of the sliding moulding (5) with spoked wheel as a gauge and reinforcement (3). Fig. 5 shows the spoked wheels pre-assembled on the ground (S1 to S4) for the wall reinforcement and the lifting of the top wheel (S4) into the starting position of the sliding moulding of the reinforced concrete cylinder. Figures 6A and 6B show further appurtenances of the sliding moulding. Description of the preferred embodiment Fig. 1 shows a diagram of an upwind power station. A tower, many hundreds of metres high, with constant inner diameter is surrounded at its base by a glass roof (2) measuring a number of square kilometres under which solar radiation generates hot air which then escapes upwards through the high tower acting as a chimney and drives a turbine (4) inside the tower. To provide stability against wind load for the high and fragile structure (the tower wall (1) is 80 cm thick at its base, at a height of several hundreds of metres only 30 cm!), the upwind power station shown has four spoked wheels (3) which prevent large deformations. Fig. 2A shows how a sliding moulding (5) with attached spoked wheel (30) is used to construct a tower wall (1). The other two lower spoked wheels (3u, 3m) of the tower are already lying ready below. Fig. 2B shows the tower in a stage in which the two lower spoked wheels (3u, 3m) have been hoisted up by means of the cables (6) and the bottom spoked wheel (3u) has subsequently been attached to the tower wall (1) by means of fastening devices (7). Fig. 2C shows how the sliding moulding (5) with attached spoked wheel (30) has moved up further, while the second-lowest spoked wheel (3m) remains parked on the bottom spoked wheel (3u) which has been attached to the tower wall (1). Fig. 2D shows the tower in a stage in which the second-lowest spoked wheel (3m) after being hoisted up with cables (6) also has been attached in its required position in the tower by means of fastening devices (7). Fig. 2E shows the tower in the stage in which the spoked wheel (30) which served as reinforcement of the sliding moulding has been attached as top reinforcement (3o) of the tower to the tower wall (1) by means of fastening devices. 3 AMENDED PAGE 28-09-2001 EP0006053 Fig. 3 shows in a sectional view through the sliding moulding (5) constructing the tower wall (1) how a spoked wheel as reinforcement (3) is attached to it with anchoring devices (12). The figure also shows that the sliding moulding is equipped with a top platform (10), a hanging platform (11) and a circular track (8) for concrete buckets (9). Fig. 4 shows the reinforcing spoked wheel (3 and 4) on the sliding moulding (5), whereby the upper stations of the lifts carrying passengers (14) and materials (16), of the concrete transport system (15) and the circular track (8) have been drawn in. The spoked wheel (S4) has an inner circular hub from which thin spokes radiate to an outer rimlike ring. The 96 trestles of the sliding moulding required in this example are shown. Figure 5 shows how by means of the lifting cable (6) of a single-cable hoist (18) which is mounted on the sliding moulding, the top reinforcing spoked wheel S4 of a set of four spoked wheels S1 to S4 which are stacked on top of one another on the ground inside the tower, is hoisted into its desired position. A lifting jack (20) and its anchorage (19) can also be seen in the drawing. Fig. 6A shows, like Fig. 3, further appurtenances of the sliding moulding. For instance, a passenger cage (22) is raised or lowered on a winch cable (21) to take the workers to and from the work site. The material for the concrete reinforcement mats is also delivered by means of a winch cable (21) to the top platform in a cage (24) and there transported to the installation site in a cart (23). Fig. 6B shows another location on the sliding moulding surrounding the tower with carts (23) for concrete reinforcements cages (24) which are hoisted up with a winch cable (21). 4

AMENDEDPAGE

28-09-2001 EP0006053 List of reference numbers 1 Tower wall 2 Glass roof for producing a temperature increase through the greenhouse effect 3 Reinforcing spoked wheel (compression ring) 3u Bottom spoked wheel 3m Middle spoked wheel 3o Top spoked wheel S1 Lowest of 4 reinforcing spoked wheels S2 Second-lowest of 4 reinforcing spoked wheels S3 Second-highest of 4 reinforcing spoked wheels S4 Highest of 4 reinforcing spoked wheels 4 Wind turbine 5 Sliding moulding 6 Lifting cable 7 Attachment of reinforcement to tower wall 8 Circular track 9 Concrete bucket 10 Top platform 11 Hanging platform 12 Anchoring of the spoked wheel to the sliding moulding 13 Platform 14 Passenger transport 15 Concrete transport 16 Concrete reinforcement materials 17 Attachment 18 Single-cable hoist 19 Anchoring 20 Lifting jack 21 Winch cable 22 Passenger cage 23 Cart 24 Concrete reinforcements cage 5 AMENDED PAGE

Claims

28-09-2001 EP0006053 PATENT CLAIMS 1 Method for the production of the high towers with constant inner diameter and uniform or variable wall thickness of upwind power stations, which in their interior contain several spoked-wheel type frames with hub, whose spokes are only subject to tensile force, as reinforcements (3) and which are constructed with the aid of a sliding moulding (5) around the circumference, whereby this sliding moulding (5) is protected against deformation and consequently the upper completed wall area is also protected against bulging until the permanent reinforcement of the tower, characterised by the fact that during the sliding operation the top spoked wheel (30) which later when the building is finished, protects the shell (1) against deformations, is integrated temporarily as reinforcement of the sliding moulding (5) into the sliding moulding construction and after the tower has reached its final height, is connected with the finished reinforced concrete wall (1), and that the other spoked wheels (3) below the top spoked wheel are only hoisted up by means of cable hoists (6) using the sliding moulding as a base, once the moulding has passed the designed height of the relevant spoked wheel (3), whereby the lower spoked wheels (3) are lifted as a packet to the installation height of the bottom spoked wheel (3u), the bottom spoked wheel (3u) is then permanently connected to the finished reinforced concrete wall (1) and the rest of the packet remains parked there until the sliding moulding (5) reaches the next reinforcement level and the hoisting process is then repeated. 2 Sliding moulding (5) for the construction of the high towers of upwind power stations with constant inner diameter and uniform or variable wall thickness, which in their interior contain several spoked-wheel type frames with hub, whose spokes are only subject to tensile force, as reinforcements (3), characterised by the fact that it surrounds the circumference of the tower and has means (12) for the detachable connection to at least the top tower spoked wheel (30) and that it is an integral part of the spoked wheel (30) until the completion of the wall (1) at the level of the top spoked wheel (30) of the tower, whereby the spoked wheel (3o) integrated temporarily into the sliding moulding (5) is a gauge for the true-to-form construction of the reinforced concrete wall (1) and that the top spoked wheel (30) temporarily connected to the sliding moulding (5) is at the same time the base for the assembly of cable hoists (18), bucket transport systems (8) and lifts (21, 22) and has means for attaching these and that the outer frame of the spoked wheel (30) is so rigid that it not only absorbs horizontally acting wind and earthquake loads, but also protects the sliding moulding (5) against deformations from eccentric loads acting through these installations. 6 AMENDED PAGE