Urban bridge rapid demolition and reconstruction construction method based on gantry crane

Abstract

The invention discloses an urban bridge rapid demolition and reconstruction construction method based on a gantry crane, and belongs to the field of bridge engineering. The method comprises the steps that S1, an auxiliary road bridge is constructed, and traffic is guided and changed to the auxiliary road bridge; S2, a main bridge gantry crane is erected; S3, a bridge dismantling bracket is erected; S4, an arch rib support is erected; S5, an accessory structure and a bridge deck system of the old bridge are detached; S6, a rope saw is adopted for cutting the bridge flange plate and hoisting away the bridge flange plate; S7, after the suspender is dismantled, the suspender is transported out of the construction site; S8, arch ribs are cut and hoisted away in a segmented mode through a gantry crane; S9, the main beam is cut, decomposed and hoisted away in a segmented mode through a gantry crane; and S10, the old pier platform steel sheet pile cofferdam is constructed and decomposition and hoisting are performed on a lower structure; according to the rapid dismantling and reconstruction method, ecological dismantling of an old bridge and rapid erection of a new bridge are achieved through repeated utilization of the bridge dismantling gantry crane, the requirements of navigation limitation and environmental protection are met, and normal traffic of urban trunk traffic is guaranteed.

Description

technical field [0001] The invention relates to the field of bridge engineering, in particular to a construction method for rapid demolition and reconstruction of urban bridges based on gantry cranes. Background technique [0002] Some concrete-filled steel tube tied arch bridges built in the early days of urban main roads cannot meet the existing traffic demand with the increase of operation time, traffic volume and load level, and often need to be demolished and rebuilt in situ. [0003] However, some bridges are restricted by inland river navigation conditions and ecological environmental protection requirements, and the overall removal and blasting methods cannot be realized. Usually, the old bridges can only be demolished by reverse demolition. This method requires a long construction period and the demolition of the bridge The equipment and facilities in the process cannot be used during the construction of the bridge, and it will take a long time to re-build the tempo...

AI Technical Summary

Problems solved by technology

[0002] Some concrete-filled steel tube tied arch bridges built in the early days of urban main roads cannot meet the existing traffic demand with the increase of operation time, traffic volume and load level, and often need to be demolished and rebuilt in situ

[0003] However, some bridges are limited by inland river navigation conditions and ecological environmental protection requirements, and the overall removal and blasting methods cannot be realized. Usually, the old bridges can only be demolished by reverse demolition. This method requires a long construction period and the demolition of the bridge The equipment and facilities in the process cannot be used during the construction of the bridge, and it will take a long time to re-build the temporary structure of the new bridge, which cannot meet the needs of rapid reconstruction of urban arterial bridges

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