Indirectly prestressed, concrete, roof-ceiling construction...

E - Fixed Constructions – 04 – B

Patent

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Details

E04B 7/02 (2006.01) E04C 3/11 (2006.01) E04C 3/26 (2006.01) E04C 3/294 (2006.01) E04C 3/04 (2006.01)

Patent

CA 2463630

The indirectly prestressed concrete roof-ceiling construction is prefabricated element for constructing industrial large-span buildings. The construction comprises distinctly wide and thin concrete soffit plate (1) and upper concrete girder (2), of the inverse "V"-shaped cross section, interconnected by slender steel pipe-rods (3) that are used to stabilize the upper girder (2) against lateral buckling and to prevent parts (1) and (2) to get closer or apart each to another. Prestressing of the soffit plate (1) causes compression in the upper girder (2) which passively (indirectly) pushes the ends of the construction, acting on some eccentricity over the center of gravity of the cross section, causing rotation of its ends bending in that way the soffit plate upwards. There are two efficient methods of prestressing these constructions.

La présente invention concerne une construction de plafond/toit en béton indirectement précontraint qui constitue un élément préfabriqué destiné à la construction de bâtiments industriels avec des toitures à grande portée. La construction de l'invention comprend une plaque de soffite en béton distinctement large et mince (1) et une poutre supérieure en béton (2) de section transversale en V inversé, reliées entre elles par de minces tiges ou tubes d'acier qui servent à stabiliser la poutre supérieure (2) contre le déversement et à empêcher les parties (1) et (2) de se rapprocher ou de s'éloigner l'une de l'autre. La mise en précontrainte de la plaque de soffite (1) entraîne une compression dans la poutre supérieure (2) qui pousse passivement (indirectement) les extrémités de la construction, exerçant une certaine excentricité sur le centre de gravité de la section transversale, ce qui entraîne une rotation des extrémités et plie de la sorte la plaque de soffite vers le haut. Il existe deux procédés efficaces de mise en contrainte des constructions de l'invention.

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