E - Fixed Constructions – 04 – C
Patent
E - Fixed Constructions
04
C
E04C 3/294 (2006.01) E04B 7/00 (2006.01) E04B 7/02 (2006.01) E04B 7/08 (2006.01) E04C 3/10 (2006.01) E04C 3/11 (2006.01) E04C 3/26 (2006.01) E04C 3/04 (2006.01)
Patent
CA 2425998
The roof-ceiling construction comprises a wide and thin concrete plate (1) and a two-part upper steel construction (2), interconnected by means of vertical elements (3). The construction is twice prestressed by two independent methods. The concrete plate (1) is centrally prestressed in the mould (86) and after the plate (1) concrete has hardened, the upper steel construction (2) is prestressed by pushing apart, at the midspan, the steel separated halves (2) which are then connected. Prestressing of the concrete plate (1) is applied to eliminate or reduce cracks in its concrete while prestressing of the upper construction by pushing apart the steel halves (2) is used to control the deflections.
La construction de plafond-toit comprend une dalle de béton (1) large et mince et une structure supérieure en acier en deux parties (2) reliées par des éléments verticaux (3). Cette construction subi un double traitement de pré-contrainte au moyen de deux techniques distinctes. La dalle de béton (1) est précontrainte centralement dans un moule (86). Une fois cette dalle durcie, on soumet la structure supérieure en acier (2) à une précontrainte en écartant à force l'une de l'autre, à mi-portée, les demi-structures d'acier avant de les relier l'une à l'autre. Le traitement de précontrainte de la dalle de béton (1) permet de réduire ou d'éliminer les fissures, celui de la structure supérieure (écartement des deux moitiés (2) en acier) de limiter les fléchissements.
Skendzic Milovan
Smrcek Branko
Blake Cassels & Graydon Llp
Mara-Institut D.o.o.
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