Construction method for demolition of existing line arch bridge with upper span

Abstract

The invention discloses a construction method for dismantling an arch bridge with an upper span existing line, comprising the steps of: 1. Erection of a protective scaffold; 2. Static crushing and demolition of the blasting demolition structure on the arch; 3. Manual demolition of the blasting protective layer; 4. The demolished arch ring cutting; 5. hoisting of the arch ring to be hoisted; 6. demolition of the structure under the arch. The method of the invention is simple, reasonable in design, convenient in construction and good in use effect. While the protective scaffolds fixed on the front and rear sides of the demolished arch bridge are used for effective protection, the demolished arch bridge is repaired by a combination of static crushing and manual chiseling. The structure on the arch is removed to ensure that the static crushing process will not damage the plain concrete arch ring and will not interfere with the existing railway line crossed; after the arch ring is exposed, use a wire saw to cut and decompose the demolished arch ring Afterwards, lifting and dismantling is carried out, and then the structures under the arch on the left and right sides are quickly dismantled, which can effectively shorten the construction period, speed up the efficiency of arch bridge demolition, and the dismantling 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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