Overwater large-span tied-arch bridge girder dismantling structure and dismantling construction method

Abstract

The invention discloses an overwater large-span tied-arch bridge girder dismantling structure and a dismantling construction method, and belongs to the technical field of arch bridge construction. Comprising a main beam bearing system and a main beam hoisting system, and the main beam hoisting system is arranged between an arch bridge main beam and an auxiliary bridge; the main beam bearing system is responsible for main bearing of a bridge in the dismantling process, and the main beam is hoisted to assist in dismantling through an overwater gantry crane; the method comprises the following main dismantling steps: S00, construction preparation; s10, arranging a main beam bearing system; s20, arranging a main beam hoisting system; s30, a cutting system is arranged; s40, a bridge deck system and ancillary facilities are dismantled; and S50, the main beam is dismantled. According to the method, complex environments that old bridges are located in dense residential areas of old cities, local traffic is complex and navigable water areas are comprehensively considered. A steel pipe support is adopted as a bearing system when the main beam is dismantled, an overwater gantry crane is adopted as a hoisting system when the main beam is dismantled, a rope saw cutting technology is adopted as a main beam block cutting method, and the method is high in adaptability and small in influence on the surroundings during construction.

Description

technical field [0001] The invention relates to the technical field of arch bridge construction, in particular to a main girder dismantling structure and a dismantling construction method of a long-span tied arch bridge over water. Background technique [0002] With the rapid development of my country's economy, urban traffic flow is increasing day by day. Some old urban roads can no longer meet the requirements of people's travel. It is a trend of urban traffic development to demolish and rebuild at the original site. Some cities are involved in the demolition process. The demolition of old bridges is much more difficult than demolition of a new bridge, especially for old bridges restricted by terrain, topography and surrounding environment, which is the top priority of demolition. The main girder of the tied arch bridge is the most important load-bearing structure, and the demolition process is also the most cumbersome and complicated stage. The traditional construction sch...

AI Technical Summary

Problems solved by technology

[0003] For the demolition of the main girder of the long-span tied arch bridge over water, the blasting construction in the traditional construction scheme will cause damage to the surrounding houses and the surrounding traffic roads, especially to the structures of the two adjacent bridges, which will affect the structure. Safety

The water blasting construction caused the entire main girder to fall into the water, seriously affecting the passage of ships, and the construction safety risk was too great

The construction of large ships with cutting and hoisting has high requirements on the level of the channel where the old bridge is located, and the applicability is not high

The traditional construction method requires a large number of personnel, high safety risks, and slow construction speed

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