Method for prepressing single large-tonnage temporary steel pipe support and then resisting beam bottom during dismantling bridge beam body, and device thereof

Abstract

The invention discloses a method for prepressing a single large-tonnage temporary steel pipe support and then resisting a beam bottom during dismantling a bridge beam body, and a device thereof. The method comprises the following steps that: bracket devices are symmetrically arranged at the lateral wall below the top part of the steel pipe; each bracket device is provided with a lifting jack; the beam body is used as a reaction frame; the beam bottom is synchronously lifted by two jacks which are symmetrically arranged along the circumference of the steel pipe; the steel pipe is pre-pressed and jacked to the place, and then chucks are symmetrically punched between the top part of the steel pipe and the beam bottom; and finally the jacks slowly discharge oil; and the preloading amount of the steel pipe is converted into active force for temporarily supporting the steel pipe, so as to achieve prepressing of a single large-tonnage temporary steel pipe support and resisting of the beam bottom. The difficulty of prepressing the large-tonnage steel pipe when the bridge is dismantled is reduced by the method; the settling volume of the bracket when the beam body is cut off and falls off and the impact force when the system is converted are greatly reduced, and the method is good in adaptability, simple in structure, convenient to fabricate, good in operability, safe and reliable.

Description

technical field [0001] The invention belongs to bridge reinforcement and demolition construction technology, in particular to a single large-tonnage temporary steel pipe support preloading and beam bottom jacking technology when a bridge girder body is dismantled. Background technique [0002] In bridge reinforcement and demolition projects, it is necessary to carry out temporary support construction in the space below the beam body; since the upper structure of the beam body has formed a large-volume structure, the construction space under the beam body is limited, and temporary support is used at the bottom of the beam body. The steel pipe support is used to bear the load of the large-tonnage beam. It not only needs to be preloaded to ensure the bearing capacity of the steel pipe support, but also needs to ensure that the steel pipe support is actively tightened first, so as to reduce the passive force settlement and system conversion of the steel pipe support when the beam...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a single large-tonnage temporary steel pipe support preloading method and its device for tightening the bottom of the beam when the bridge girder is dismantled, so as to solve the above problems

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