Construction method for dismantling overwater suspended arch bridge

Abstract

The invention discloses a construction method for dismantling an overwater suspended arch bridge. A seventh span to a twelfth span are dismantled, ninth to twelfth spans are dismantled in a dismantling sequence from the twelfth span to the ninth span through the same process steps as a thirteenth span, sequential hole-by-hole removal is adopted, the distance between a long-arm gun machine and a dismantling hole meets the safety distance, an eighth span and a seventh span are dismounted according to the same process requirements, after the upper structure of each span of an approach bridge is dismantled, corresponding bridge piers are chiseled off, a foundation is enlarged, and scattered rock ballast and concrete materials in a site are cleared away and transported to a muck site so as to provide an operation site for subsequent span bridge chiseling. According to the overwater suspended arch bridge dismantling construction method, operation of mechanical equipment and personnel on an old bridge is avoided, the safety risk of dismantling the old bridge is reduced, the bridge dismantling construction process is simple and clear, operation and popularization are easy, meanwhile, the input amount of the mechanical equipment is small, consumables such as explosives are not needed, and the operation safety of the overwater suspended arch bridge dismantling construction method is improved.

Description

technical field [0001] The invention belongs to the technical field of dismantling and utilization of suspended arch bridges, and in particular relates to a construction method for dismantling suspended arch bridges over water. Background technique [0002] The construction method for dismantling a suspended arch bridge over water is a construction method for dismantling a suspended arch bridge structure by using a long-arm cannon and a long-arm excavator. [0003] Comparative document CN106758887A discloses a method for dismantling the whole continuous girder bridge. The method for dismantling the whole continuous girder bridge adopts the pier system module and the lowering system module; the method for dismantling the whole continuous girder bridge includes the following steps: Step 1, Preparatory work, step 2, remove the temporary pier system for the whole bridge and install it, step 3, install the temporary pier, cut the flange of the main girder, step 4, install the who...

AI Technical Summary

Problems solved by technology

[0005] In order to overcome that when the user dismantles the bridge body through the traditional method of dismantling the suspended arch bridge over water, the conventional construction plan for dismantling the old bridge over water includes blasting construction or large-scale ships with cutting and hoisting construction. Referring to similar engineering construction experience, blasting construction will cause The damage to the surrounding houses has a certain impact on the surrounding densely populated areas, and there are many old brick buildings in the surrounding area, which cannot be applied to the old urban areas with poor seismic performance of the building structure; Construction also requires ships to cooperate with drilling, which is not conducive to emergency demolition of dangerous bridges; and traditional blasting construction requires drilling on old bridges, which poses a high risk of construction safety. The requirements are high, and the simultaneous cutting, hoisting and demolition technology is usually suitable for the demolition of bridges with better integrity such as reinforced concrete bridges and steel bridges, but is not suitable for bridges with masonry structures such as masonry arch bridges and arch bridges; The construction method of cutting and hoisting large ships requires a large number of personnel, high safety risks, and slow construction speed, which cannot quickly solve the technical problems of emergency demolition of suspended arch bridges in dense residential areas; at the same time, the efficiency of traditional suspension arch bridge demolition construction operations is low, increasing In order to reduce the time required for the demolition and construction of traditional suspended arch bridges, a method for demolition and construction of suspended arch bridges over water is proposed

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