Integral lowering and demolition method for continuous beam bridge

Abstract

The invention discloses an integral lowering and demolition method for a continuous beam bridge. The method adopts a pier system module and a lowering system module and includes steps: step one, preparing; step two, mounting an integral demolition temporary pier system; step three, mounting temporary piers and cutting main beam flanges; step four, mounting a integral lowering system; step five, synchronously lowering, lifting, constructing and the like. The pier system module comprises steel pipe piles, temporary pier parallel connectors, transverse connection beams, longitudinal distribution beams and the like. The lowering system module comprises dragging beams, a steel stranded lifting rope anchor system, anchor plates, continuous lifting jacks and supporting blocks. The method is applicable to demolition of the high-pier continuous beam bridge large in clearance of span and has advantages of quickness in demolition, safety in construction and cost saving.

Description

technical field [0001] The invention relates to a method for dismantling a girder bridge, in particular to a method for dismantling a whole continuous girder bridge. Background technique [0002] Since the 1970s, concrete continuous box girder bridges have become the most competitive bridge type within the range of 60m to 300m due to their good adaptability and economy. They have been widely used in my country, and tens of thousands of them have been built. Among concrete bridges, continuous girder bridges are more widely used. During the use of these bridges, some bridges need to be demolished due to congenital design defects, changes in use functions, or road network re-planning. Bridges that are not subject to boundary conditions can be demolished by blasting, but for densely populated and nearby buildings Continuous girder bridges such as deep-water river-crossing bridges and river-crossing bridges that cannot be demolished by blasting need to find an efficient, environm...

AI Technical Summary

Problems solved by technology

The common method is to cut the abandoned bridge into small pieces and then lower it down, which will cause high cutting costs and is not conducive to saving production; in addition, in order to improve economic benefits, the concrete bridge is cut into larger demolition units, forming a whole span Technology, the existing patented technology, the two Chinese patents with patent No. 201510042199.9 and patent No. 201510063144.6 proposed a method of dismantling the entire span bridge with different support systems, but this method needs to cut off the prestress of the continuous box girder, changing the original Structural force system, the bearing capacity of the beam section is unknown, and some beam sections need to be strengthened and then lowered.

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