A whole-span box girder demolition system based on bridge deck support and its construction method

Abstract

The invention relates to the technical field of bridge removing engineering, and particularly relates to an integral lowering and removing system of span box girders based on bridge deck support and a construction method of the integral lowering and removing system. The system comprises piers which are used for lowering the two ends of a box girder, and two sets of cantilever reaction systems which are symmetrically arranged on the two ends of the lowered box girder. Each cantilever reaction system comprises two main outriggers and a hoisting cable. The ends of the two main outriggers are anchored on the corresponding pier, and the other ends are spaced by a certain distance; the hoisting cable is slidingly connected to the end parts of the main outriggers, one end of the hoisting cable is connected with a lowering power system, and the other end of the hoisting cable is connected with a hoisting device which is used for hoisting the lowered box girder. The lowering power system is installed on the main outriggers. According to the integral lowering and removing system, the box girders are lifted and lowered through continuous jacks of which hoisting capacities are large, so that the cutting area of concrete is greatly reduced, and removing cost is effectively reduced; the invention has the characteristics such as good safety, controllability, operability and application prospect, and is not only suitable for removing the straight girder bridges, but also suitable for removing the curved bridges.

Description

technical field [0001] The invention relates to the technical field of bridge demolition engineering, in particular to a whole-span box girder demolition system based on bridge deck support and a construction method thereof. Background technique [0002] With the rapid development of the economy and society, some bridges have structural problems because they cannot meet the existing traffic requirements or because the technology, materials and management level of the previous construction are backward, so it is necessary to demolish them. To dismantle the box girder bridge in a safe, adaptable, fast, environmentally friendly and economical way, there are major technical problems of "decomposition, hoisting and safety control". Commonly used demolition methods include blasting demolition and non-blasting demolition. As far as the existing non-blasting methods are concerned, the better concrete decomposition method is the hydraulic cutting method. Cutting disused bridges into...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the economy and society, some bridges have structural problems because they cannot meet the existing traffic requirements or because the technology, materials and management level of the previous construction are backward, so it is necessary to demolish them. Safe, adaptable, fast, environmentally friendly and economical demolition of box girder bridges, there is a big technical problem of "decomposition, hoisting, safety control"

Commonly used demolition methods include blasting demolition and non-blasting demolition. As far as the existing non-blasting methods are concerned, the better concrete decomposition method is the hydraulic cutting method. Cutting abandoned bridges into small pieces and then lowering them will generate high cutting costs, which is not conducive to saving production

In order to improve economic benefits, it is necessary to cut the concrete bridge into larger demolition units as much as possible, thereby reducing the cutting area, but the increase in hoisting weight brings new difficulties to hoisting and transportation

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