Active support method used for tunnel crossing existing bridge

Abstract

The invention provides an active support method used for a tunnel crossing an existing bridge. The method comprises the steps: S1, before tunnel crossing construction, a jacking system with a plurality of arranged jacking apparatuses is adopted for actively jacking the bridge; S2, the jacking amount of the bridge subjected to the step S1 is monitored to judge whether the jacking amount meets an active jacking amount requirement; if not, the step S1 is repeated; if so, the bridge is firstly raised by adopting supporting seats, and then girder falling is carried out so as to prepare for the tunnel crossing construction. According to the invention, before the tunnel crossing construction, active jacking is carried out according to the bridge setting amount which is possibly caused by the tunnel crossing construction, even if the bridge subsides after the construction, the bridge can be still maintained within a safe range, and the hazards of stress, cracks, sedimentation and the like of the bridge caused by the tunnel crossing construction are avoided; and the potential safety hazard problem of the bridge caused by the construction can be solved by the active jacking.

Description

technical field [0001] The invention relates to an active support method for a tunnel crossing an existing bridge, which belongs to the technical field of construction. Background technique [0002] With the continuous development of urban rail transit, the spatial intersection between urban tunnels and the foundations of existing bridges is inevitable. Disturbances in the upper and surrounding strata directly lead to damages such as deformation, displacement, and internal stress increase of the bridge foundation and superstructure to varying degrees. When this impact exceeds the allowable safety control range of the existing bridge, it will lead to new structural damage of the bridge or aggravate the damage of the existing damage, which seriously threatens the use safety or structural safety of the bridge. In addition, once the above-mentioned problems occur, it will inevitably cause delays in the tunnel crossing construction, which in turn will generate a series of additi...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the bridge may be deformed due to failure to judge whether the bridge needs active jacking before construction, thereby providing a method for judging whether the bridge needs to be jacked before construction to ensure that the bridge Non-deformable active support method for tunnel crossing existing bridges

[0005] The technical problem to be solved by the present invention is to overcome the imperfection of the active support monitoring system in the prior art so as to provide an active support method for tunnels crossing existing bridges with a perfect monitoring system

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