Temporary support structure for steel beam across existing line and method for constructing steel beam

Abstract

The invention discloses a temporary support structure for a steel beam across an existing line. The temporary support structure for the steel beam across the existing line comprises two sets of supporting systems and a supporting bracket; the two sets of supporting systems are symmetrically arranged on both sides of the existing line, and the lower ends of the support systems are arranged on the ground. The supporting bracket transversely spans the existing line and is mounted on the two supporting systems; the steel beam to be installed is mounted on the supporting bracket. The invention further provides a method for constructing a steel beam section across the existing line. The temporary support structure for the steel beam across the existing line and the method for constructing the steel beam section across the existing line have the beneficial effects that the hoisting of the steel beam across the existing line can be completed without hindering the normal passage of the existing line, and the method of direct use of the crane hoisting in a blocked mode makes up for the deficiency and limitation in the use of an incremental launching method; and the temporary support structure for the steel beam across the existing line and the method for constructing the steel beam section across the existing line are further applicable to the case where the steel beam is overweight and cannot be hoisted as a whole, but can only be hoisted in pieces, and the steel beam to be constructed is located circular curves with relatively large radius and radian line type.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a steel beam temporary support structure spanning an existing line and a steel beam construction method. Background technique [0002] With the rapid development of my country's infrastructure construction and transportation industry, more and more road and railway bridges are being built across seas, rivers and land, and the complex environment and working conditions of various bridge constructions have become a big challenge challenge. Different bridges have different construction methods due to their different construction environments, involving different temporary supports and installation techniques. In addition, considering factors such as project progress and construction speed, safety and economy, how to optimize the temporary support and its construction method under the condition of meeting the technical and economic requirements is the key during the const...

AI Technical Summary

Problems solved by technology

However, the jacking construction method has the following obvious defects: there are many restrictions on the geometric shape of the bridge structure. The continuous change of force will increase the beam height and material consumption, especially the amount of prestressed steel bars. Due to the limitation of the bending moment of the jacking cantilever, it is uneconomical for the jacking span to be greater than 70-80 meters; repeated stress during the jacking process , so that the value of the beam height is large, there are many temporary beams, and the tensioning process is cumbersome; in addition, the jacking construction can only have two working faces at most, which also limits the speed of the jacking construction

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