Pneumatic construction or bridging element

E - Fixed Constructions – 01 – D

Patent

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Details

E01D 15/12 (2006.01) E01D 15/20 (2006.01) E04C 3/00 (2006.01) E04H 15/20 (2006.01)

Patent

CA 2454241

The structural or bridge element is constructed from a sheath (1) made of textile fabric, preferably of low extensibility, which is covered in an airtight manner with a flexible plastic. Secured longitudinally within the sheath 1 are a plurality of textile webs of low extensibility in an assembly of mutually parallel planes. The thread profile of first layers 4 of the fabric of the webs 3 is turned through approximately 45° in relation to the longitudinal axis of the bridge element. Second layers 5, each arranged within the same web 3 as the first layer 4, have a thread profile which is selected to be parallel and perpendicular to the longitudinal axis of the bridge element. Bars 6 are arranged on the outside of the sheath 1, respectively in each plane of the webs 3, and are secured within shackles on the sheath 1. The sheath 1 is supplied with compressed air within the range of a few 100 mB. Wherever the bridge element is laid onto the ground of a cutting 8, the sheath 1 is strengthened by means of a protective covering 9. Fig. 1

L'invention concerne un élément de construction ou de pontage composé d'une enveloppe (1) en tissu textile présentant de préférence une faible extensibilité, revêtue d'un plastique flexible de manière étanche à l'air. L'enveloppe contient longitudinalement une pluralité d'entretoises textiles de faible extensibilité fixées dans un système de plans parallèles. Le sens de fil de premières couches (4) du tissu des entretoises (3) est tourné d'environ 45 DEG par rapport à l'axe longitudinal de l'élément de pontage. De deuxièmes couches (5) disposées dans la même entretoise (3) que la première couche (4) présentent un sens de fil parallèle, perpendiculaire à l'axe longitudinal de l'élément de pontage. L'extérieur de l'enveloppe (1) comporte dans chaque plan des entretoises (3), des tiges (6) fixées dans des colliers sur l'enveloppe (1). L'enveloppe (1) est soumise à de l'air sous une pression de quelques centaines de mB. L'enveloppe est renforcée par un revêtement de protection (9) dans la zone d'implantation de l'élément de pontage sur la base d'une tranchée (8).

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