Circular formwork

E - Fixed Constructions – 04 – G

Patent

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Details

E04G 11/06 (2006.01)

Patent

CA 2497358

Disclosed is a formwork element (1) which can be assembled with other formwork elements (1) so as to form a formwork structure. A formwork shell (4) having an adjustable curvature is supported by means of back supports (5) so as to create a stiff formwork element (1) that sustains concreting pressure. The supports (5) have a preferably trapezoidal cross section and are provided with fastening flanges (6) on the edges thereof and at least one girder (7) that is located at a distance from the formwork shell (4). The length of the girder (7) is adjustable in order to set or modify the curvature of the formwork shell (4) which is made of steel or plastic. Intermediate pieces (9) are disposed between the fastening flanges (6) of the supports (5) and the formwork shell (4). The fastening flanges (6) are fixed to said intermediate pieces (9) so as to be pivotable or tiltable relative thereto about the longitudinal direction thereof. The cross section of the flanges and/or the intermediate pieces (9,12) having a convex shape or being provided with slopes (61).

L'invention concerne un élément de coffrage (1) qui peut être assemblé avec d'autres éléments de coffrage (1) analogues pour former un coffrage. Une membrane de coffrage (4) qui présente une courbure ajustable et est supportée par des supports arrières (5) permet de produire un élément de coffrage (1) rigide qui résiste à la pression de bétonnage. Les supports (5) présentent de préférence une section transversale trapézoïdale et comportent des brides de fixation (6) qui sont disposées au niveau de leurs bords. En outre, ces supports comportent au moins une membrure (7) qui est espacée de ladite membrane de coffrage (4) et dont la longueur qui peut être régulée pour ajuster ou modifier la courbure de la membrane de coffrage (4) qui est constituée d'acier ou de plastique. De plus, des pièces intermédiaires (9) sont disposées entre les brides de fixation (6) du support (5) et la membrane de coffrage (4). Selon l'invention, lesdites brides de fixation (6) sont fixées sur ces pièces intermédiaires de façon à pouvoir pivoter ou basculer par rapport à ces dernières autour de leur direction longitudinale, la section transversale desdites brides (6) et/ou pièces intermédiaires (9, 12) étant convexe ou comprenant des segments inclinés (61).

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