Full-set dismantling and installing construction method of bridge overpassing existing line

Abstract

The invention discloses a full-set dismantling and installing construction method of a bridge overpassing an existing line. Full-set dismantling and installing construction is conducted on a plurality of beam segments needing to be dismantled of a used beam to be dismantled from front to back. The full-set dismantling and installing construction method comprises the steps that firstly, a pavement layer of the bridge surface is milled; secondly, roof-propping is conducted on the beam segments; thirdly, preparatory work is conducted before hoisting; fourthly, hoisting and moving-out are conducted; fifthly, one beam segment is installed after replacement; sixthly, full-set dismantling and installing construction of the next beam segment is conducted, specifically, full-set dismantling and installing construction is conducted on the next beam segment needing to be dismantled of the used beam to be dismantled according to the first step to the fifth step of the method; and seventhly, the sixth step is repeated once or more than once till full-set dismantling and installing construction of all the beam segments needing to the dismantled in the used beam to be dismantled is completed. The method is simple in step, reasonable in design, easy and convenient to implement and good in using effect, full-set dismantling and installing construction of the bridge overpassing the existing line can be completed easily, conveniently and rapidly, the construction process is safe and reliable, the construction period is short, and the method is economical and practical.

Description

technical field [0001] The invention belongs to the technical field of bridge construction, and in particular relates to a method for dismantling and installing an entire group of bridges spanning existing lines. Background technique [0002] In recent years, with the rapid development of national transportation infrastructure, some expressways built in the early stage can no longer fully meet the needs of current traffic volume, and the existing expressway reconstruction and expansion projects are increasing day by day. In particular, the bearing capacity of the original expressway bridges spanning the existing railway lines has declined, and it is almost unable to meet the increasing traffic load. It is imminent to strengthen and reconstruct those bridges with insufficient bearing capacity. In the construction of expressway reconstruction and expansion adjacent to or across the existing railway line, it has become a new research topic in the field of engineering constructi...

AI Technical Summary

Problems solved by technology

When carrying out reconstruction and expansion of the above-mentioned bridges, there is currently no successful experience for reference, and there are few technical materials available for reference. A scientific and reasonable construction plan is selected to dismantle and renew the large-volume, large-tonnage highway bridges across the existing railway lines Installation and construction are of great significance to ensure the safe operation of busy railway lines and the smooth construction of expressway reconstruction and expansion

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