Construction method and special guard screen for static demolition and home position reconstruction of overpass bridge

Abstract

The invention relates to a construction method and a special guard screen for static demolition and home position reconstruction of an overpass bridge. A static demolition method comprises the following steps of performing mid-span bridge surface separation; performing hoisting hole arrangement, blocking, symmetric cutting and hoisting away on anti-collision walls on two sides; performing hoisting hole arrangement and hinging crack cutting and separation on same-span simply supported beams; and performing sequential hanging away one by one from left to right or from right to left and the like. A home position reconstruction method comprises the following steps of constructing stand columns and bent caps, constructing beam plates, constructing auxiliary engineering, and the like. According to the construction method disclosed by the invention, the structure of the overpass bridge is demolished according to the requirement that the traffic is not interrupted, a method comprising the following steps of determining the sequence of demolishing the bridge and separating spans, blocking and cutting anti-collision guardrails, and cutting and lifting a main beam is adopted, so that beam members are cut into blocks, are hoisted by a crane, and can be directly transported away by a transporting vehicle; the method is high in civil construction degree, simple and easy to operate, wide in application range, and easy to popularize; the situation that passing under the overpass bridge and the construction are safe is guaranteed; during construction, the situation that passing of the highway is smooth and safe is guaranteed; the civil construction degree is high; and the construction method has good social benefits and economic benefits.

Description

technical field [0001] The invention relates to the technical field of expressway widening, in particular to a method for statically dismantling and in-situ reconstruction of an expressway widening flyover. Background technique [0002] With the rapid development of the economy, it is imperative to widen the expressway, and the corresponding overpasses, separation bridges, etc. have flyovers, which will inevitably face the problem of demolition, displacement or in-situ reconstruction. At present, the demolition methods of existing bridges mainly include on-site mechanical crushing method, block-cutting method of full support, segmental dismantling method of cantilever of bridge erecting machine, directional blasting method and overall jacking method, etc. Requirements for road traffic and construction while opening to traffic. [0003] The existing mechanical crushing method and directional blasting method have the advantages of fast construction speed, but both have the di...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for the static dismantling and in-situ reconstruction of the overpass bridge and its special protective net. In the dismantling method of the existing bridge, the existing noise disturbs the surrounding area greatly, the amount of on-site garbage cleaning is large, and it is environmentally friendly. It also solves the technical problem that the construction surface is covered with the entire road in the existing bridge demolition method, a large number of machines are used, and the technical problem that the construction of the highway under the bridge cannot be satisfied while opening to traffic

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