Doubly prestressed roof-ceiling construction with grid...

Details Doubly prestressed roof-ceiling construction with grid... Doubly prestressed roof-ceiling construction with grid...

E - Fixed Constructions

04

B

E04B 7/02 (2006.01) E04B 5/10 (2006.01) E04C 3/22 (2006.01) E04C 3/293 (2006.01) E04C 3/294 (2006.01)

Patent

CA 2463720

The doubly prestressed roof-ceiling construction with grid flat soffit for extremely large-span is prefabricated element intended for assembling roofs of extremely large-span buildings with flat soffit. The construction comprises the grid soffit construction (1) and the upper concrete girder (2) of a modified "T" shaped or of an inverse "V" shaped cross section, interconnected by slender steel pipe-rods (3) that stabilize the upper girder (2) against lateral buckling. The empty openings within elements of the horizontal grid (1) are fulfilled with plates (6) wherewith a flat soffit is achieved. The construction is prestressed by the double prestressing. The grid-soffit (1) is prestressed centrically and the upper girder (2) is prestressed by the wedge (5) at the midspan.

L'invention concerne une structure de toit/plafond doublement précontrainte avec soffite plat à grille destinée à une portée extrêmement grande. Cette structure est un élément préfabriqué servant à assembler des toits de bâtiments à portée extrêmement grande avec un soffite plat. Ladite structure comprend une structure de soffite à grille (1) et une poutre de béton supérieure (2) à section transversale en forme de T modifié ou en forme de V inverse, reliées par de fines barres/tiges en acier (3) stabilisant la poutre supérieure (2) contre un flambage latéral. Les ouvertures vides des éléments de la grille horizontale (1) sont fermées avec des plaques (6), d'où l'obtention d'un soffite plat. Cette structure est précontrainte par double précontrainte. Le soffite à grille (1) est précontraint de manière centrée, la poutre supérieure (2) étant précontrainte au moyen d'une cale (5) au niveau de la travée centrale.

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