Special telescopic device for isolated bridge

Abstract

The invention discloses a special telescopic device for an isolated bridge. The special telescopic device comprises side beam steel and N pieces of middle beam steel positioned between two pieces of side beam steel; a V-shaped sealing rubber tape is connected between the middle beam steel and the middle beam steel or between the middle beam steel and the side beam steel; the side beam steel is fixedly arranged on bridge bodies at two sides of a telescopic seam through cast-in-place concrete and an anchoring rib; the telescopic device further comprises M groups of supporting limiting control systems which are uniformly distributed and mounted at the two sides of the telescopic beam; the supporting limiting control systems are the same in structure; each supporting limiting control system comprises a supporting mechanism, a displacement control mechanism and a limiting mechanism which are sequentially installed; each supporting mechanism provides large-angle displacement for the telescopic device; each displacement control mechanism controls uniformity of displacement of the telescopic device; and each limiting mechanism prevents an accident when extension and retraction is excessive. The special telescopic device is reasonable in structure, and enables a vehicle to stably pass and transmits vehicle load to a beam body through the supporting mechanisms; super-large transverse displacement, vertical displacement, vertical steering and horizontal steering can be realized, and deformation needs, under earthquake action, of the bridge are met.

Description

technical field [0001] The invention relates to a bridge device, in particular to a special telescopic device for shock-absorbing and isolating bridges. Background technique [0002] The expansion device is installed on the bridge deck and is one of the important connecting components in the bridge structure, which can ensure the safety and comfort of driving. The ordinary bridge expansion device is only based on the contraction and creep of the bridge, the expansion and contraction of the beam caused by the temperature change and the impact of the vehicle load on the bridge. The impact and vibration of the bridge, etc., design the expansion and contraction, lateral displacement, vertical displacement, vertical rotation angle, and horizontal rotation angle of the expansion device; according to the seismic code revised by the Ministry of Communications after the Wenchuan Earthquake, for areas with high The damage of the bridge structure requires two measures, the seismic desi...

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Problems solved by technology

[0002] The expansion device is installed on the bridge deck and is one of the important connecting components in the bridge structure, which can ensure the safety and comfort of driving. The ordinary bridge expansion device is only based on the contraction and creep of the bridge, the expansion and contraction of the beam caused by the temperature change and the impact of the vehicle load on the bridge. The impact and vibration of the bridge, etc., design the expansion and contraction, lateral displacement, vertical displacement, vertical rotation angle, and horizontal rotation angle of the expansion device; according to the seismic code revised by the Ministry of Communications after the Wenchuan Earthquake, for areas with high The damage of the bridge structure requires two measures, the seismic design and the shock-isolation design, to protect the safety of the bridge structure in the event of an earthquake; Deformation and hysteretic energy consumption realize the shock absorption and isolation function of the structure. If the matching telescopic device is improperly selected, collisions between beams and beams and between beams and platforms will occur, so that the shock absorption and isolation design cannot exert a good effect, resulting in Damage to telescopic devices and even bridge structures, disrupting traffic and affecting earthquake relief work

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