Portrait multi-point continuously dragging construction method for trussed steel beam

Abstract

The invention relates to a drag construction method of a steel truss girder, in particular to a steel truss girder multi-point continuous vertical drag construction method; wherein, a front guide beam is arranged in the front end of the steel truss girder, and a steel truss girder assembling construction platform bracket is arranged among bridge pier bodies; a whole internode is made by using theline-cross gate-hanging assembling steel beam bar, and then the multi-point synchronous continuous drag steel truss girder and the front guide beam are moved forward; the steel truss girder internodebar components are sequentially assembled on the vacate assembling bracket; the multi-point synchronous continuous drag steel truss girder continues to move forward to n internodes, and the erection of the steel truss girder is finished by recycling like that. The invention has the advantages of assembling the steel beam in bearings of a bank, having the ability of doing the industrialized work, avoiding the bad effect to the welding of the steel beam and the high strength bolt wring quality caused by the rain season and winter season, guaranteeing the quality, and shortening the constructiontime efficiently.

Description

technical field [0001] The invention relates to a dragging construction method of a steel truss girder, in particular to a multi-point continuous longitudinal dragging construction method of a steel truss girder. Background technique [0002] With the rapid development of my country's economy and technology, more and more steel girder bridges need to be built. Steel girder bridges with large spans and multi-span continuous (or temporary continuous and then simply supported) are often used when crossing large rivers. The erection of steel truss girders is generally carried out by loose assembly, the construction period is long, and the welding quality of steel truss girders is not easy to guarantee in winter. Therefore, in order to improve the quality of erecting steel truss girders and shorten the construction period, construction workers generally assemble steel girders on shore supports as much as possible to achieve factory operations and avoid quality problems caused by...

AI Technical Summary

Problems solved by technology

Using this method to erect steel girders has the following three problems: (1) It requires a high suspension tower and is greatly affected by wind, so it is not suitable for use in strong wind areas

In addition, the assembly of the sling tower itself belongs to high-altitude operations, the assembly period is long, and it is not safe

(2) Since the sling tower needs to provide a large upward pulling force at the cantilever end of the steel beam, and needs to be symmetrically cable-stayed front and rear, the tower needs to bear double the vertical pressure, and the force is very large, while meeting the vertical height , In the case of rigidity requirements, the steel tower itself has strong requirements, the structure is very large, and the cost is high

This method has the following two problems: (1), the temporary pier uses the bearing capacity of the foundation as the reaction force to provide the upward force on the cantilever end of the steel beam, and the temporary pier is greatly affected by the environment

If a temporary pier is built in water, on a weak foundation or when the bridge is high, the construction of the temporary pier itself is more difficult, and the investment of the temporary pier is very large

And limited by water flow, water depth, and shipping conditions, it is not suitable to build temporary piers in deep water, fast-flowing, and busy shipping areas.

(2) Since the foundation of the temporary pier needs to be deeply buried in the soil, it is not suitable for reverse use, resulting in large waste and high cost

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