Demolition construction method for overpass existing line arch bridge

Abstract

The invention discloses a demolition construction method for an overpass existing line arch bridge. The demolition construction method comprises the steps: 1, erecting a protective shed frame; 2, carrying out static crushing demolition on the arch blasting demolition structure; 3, manually removing the blasting protection layer; 4, cutting the removed arch ring; 5, hoisting the arch ring to be hoisted; and 6, dismantling the under-arch structure. The method is simple, reasonable in design, easy and convenient to construct and good in using effect; the protection shed frames fixed to the frontside and the rear side of the removed arch bridge are adopted for effective protection, meanwhile, the structure on the arch of the removed arch bridge is removed in the mode that static crushing andmanual chiseling are combined, it is guaranteed that a plain concrete arch ring cannot be damaged in the static crushing process, and an existing spanned railway line cannot be disturbed. After the arch ring is exposed, the removed arch ring is cut and decomposed through a rope saw and then hoisted and removed, then the under-arch structures on the left side and the right side are rapidly removed,the construction period can be effectively shortened, the arch bridge removing efficiency is improved, and the removing process is safe and reliable.

Description

technical field

[0001] The invention belongs to the technical field of bridge construction, and in particular relates to a construction method for demolishing an arch bridge with an upper span existing line. Background technique

[0002] At present, my country's existing electrified railways have many additional second-line projects and renovation projects. Most of the newly-built second-line lines are built next to the existing railways. The existing railways are built with low standards. Due to planning and investment restrictions, no second-line lines are reserved. Most of the existing railway bridges on the upper span need to build new bridges and dismantle the old bridges when building the second line, so as to meet the construction needs of the new second line foundation project. When upgrading highways and municipal projects, when rerouting is limited, when upgrading highway bridges in situ, the existing bridges also need to be demolished, and when seriously diseased h...

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