Importance

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Abstract

A large resisting distortion combo-type bridge expansion device, comprises fixed comb plate 2 and moveable comb plate 1 which are respectively disposed on the girder 10 where at the two sides of the bridge expansion device, the moveable comb plate 1 has comb teeth 11 interdigitate with the comb teeth 21 of the fixed comb plate, the moved comb plate 1 has a rotating shaft 8 at the bottom of its second end, and the two ends of the rotating shaft 8 pivot in the shaft seat 7 which is directly or indirectly fixed on the girders 10. In the present invention the second end of the moveable comb plate is rotatable, by which the moved comb plate will rotate round the girders when the girders have deflection distortion and the ends of the girders are raising or sinking. Therefore, the moved comb plate can keep flat to avoid damage of the expansion device, and to ensure that the vehicle can pass safely and smoothly.

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First Claim