Round formwork module
A round formwork module comprising a flexible skin having a front side which, when used, constitutes the forming surface for a concrete structure which is to be cast, and also provided with a rear side and a supporting structure which is arranged on the rear side of the skin and which can be displaced in order to enable the skin to be bent along a direction in which it extends. The invention is characterized in that the supporting structure has a base structure and two side elements which are arranged laterally, close to the base structure. The side elements are respectively secured to a lateral edge area of the skin and protrude therefrom close to the base structure. An adjustment device for adjusting the curvature is provided in between the base structure and the side elements.
1. A round formwork module ( 2 ) comprising a flexible skin ( 4 ) with a front ( 6 ) forming in use the shaping surface for the concrete structure to be cast, and a back ( 8 ), and a support structure ( 10 ) that is disposed on the back ( 8 ) of the skin ( 4 ) and adjustable to permit curvature of the skin ( 4 ) along a direction of extension of the skin ( 4 ), the support structure ( 10 ) having a base structure ( 14 ) and two side elements ( 16 ) disposed laterally beside the base structure ( 14 ) in the direction of curvature, the side elements ( 16 ) each being fastened to a lateral edge area ( 18 ) of the skin ( 4 ), and an adjusting apparatus ( 12 ) being provided between the base structure ( 14 ) and each of the side elements ( 16 ) for adjusting the curvature, wherein
the side elements ( 16 ) extend away from the lateral edge area into the proximity of the base structure ( 14 ), and the adjusting apparatus ( 12 ) is connected to the base structure ( 14 ) or the side element ( 16 ) flexibly only on one side.
2. A round formwork module ( 2 ) according to claim 1 , wherein the adjusting apparatus ( 12 ) is an adjusting screw ( 12 ).
3. A round formwork module ( 2 ) according to claim 2 , wherein the adjusting screw ( 12 ) is connected rigidly to the base element ( 14 ).
4. A round formwork module ( 2 ) according to claim 1 , wherein the base structure ( 14 ) has at least two beams ( 32 ) at right angles to the direction of curvature to which the skin ( 4 ) is fastened.
5. A round formwork module ( 2 ) according to claim 1 , wherein the base structure ( 14 ) has two beams ( 32 ) at right angles to the direction of curvature that are connected with at least two secondary beams ( 34 ; 36 ) to form a frame scaffold ( 38 ).
6. A round formwork module ( 2 ) according to claim 5 , wherein the base structure ( 14 ) has a plurality of frame scaffolds ( 38 ) with two interconnected beams ( 32 ) that are interconnected via an intermediate element ( 56 ).
7. A round formwork module ( 2 ) according to claim 6 , wherein the intermediate element ( 56 ) has an elongate central beam ( 58 ) fastened to the skin ( 4 ) in the middle between the frame scaffolds ( 38 ) and at right angles to the direction of curvature and from which lateral arms ( 60 ) protrude into the proximity of the frame scaffolds ( 38 ), with adjusting apparatuses ( 12 ) being provided between the arms ( 60 ) of the intermediate element ( 56 ) and the frame scaffolds ( 38 ) for adjusting the curvature.
8. A round formwork module ( 2 ) according to claim 1 , wherein it is designed as a frame formwork module, the side elements ( 18 ) forming first frame parts ( 46 ) for connection with round formwork modules ( 2 ) laterally adjacent in use, and second frame parts ( 36 ) are provided for connection with round formwork modules ( 2 ) vertically adjacent in use.
9. A round formwork module ( 2 ) according to claim 8 , wherein the frame parts ( 36 , 46 ) are folded sheet-metal shaped parts.
10. A round formwork module ( 2 ) according to claim 8 , wherein the frame parts ( 36 ) have in cross section a depression ( 48 ) open toward the inside of the frame for the frame couplers ( 42 ) to engage in use for interconnecting two round formwork modules ( 2 ).
11. A round formwork module ( 2 ) according to claim 1 , wherein the skin ( 4 ) is reinforced between the base structure ( 14 ) and the side elements ( 16 ).
12. A frame formwork module ( 2 ) according to claim 11 , characterized in that the skin ( 4 ) is reinforced with a steel band ( 40 ).
13. A frame formwork having at least one frame formwork module ( 2 ) according to claim 1 .