Long-distance incremental launching construction method for deck type arch bridge steel-concrete composite girder span arch ring

Abstract

The invention relates to a long-distance incremental launching construction method for a deck type arch bridge steel-concrete composite girder span arch ring. The long-distance incremental launching construction method for the deck type arch bridge steel-concrete composite girder span arch ring comprises the steps of mounting a steel girder assembly platform and a gantry crane; mounting a slide way girder and a limiter on a spandrel column, placing a sliding, deviation rectifying and lifting device and a mounting a drag type incremental launching power device; connecting a steel strand to thespandrel column in series and applying a pretension force; enabling cable-stayed steel strands at the roots of No. 2, No. 4, No. 8 and No.10 uprights to be connected with the top of a junction pier and applying a pretension force; assembling a composite girder on the the assembly platform and mounting a front launching nose; towing the assembled girder segments forwards by using a horizontal jack;after a space is available on the site, continuing to assemble a rear boundary beam body; alternately carrying out towing and assembling; connecting the head part of a rear link with the tail part ofa front link by using a pin shaft and integrally pushing the rear link and the front link; dismantling the front launching nose mounting the last one pier on the steel girder; after the steel girderis integrally pushed in place, releasing the connection between the steel girders; and dismantling a rear launching nose and carrying out enabling the girders to fall in sections. According to the long-distance incremental launching construction method for the deck type arch bridge steel-concrete composite girder span arch ring, the construction quality can be improved, the construction efficiencycan be enhanced, the working period can be reduced and the construction cost can be reduced.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a long-distance jacking construction method for a steel-concrete composite beam spanning an arch ring of an upwardly supported arch bridge. Background technique [0002] At present, steel pipe arch bridges are widely used. However, for the overhead arch bridge across the Grand Canyon, there will be the following problems when erecting the main girder: the construction site is small and belongs to high-altitude operations, and the construction work requires high precision; , which is a flexible pier, requires high control of the horizontal force of the column on the arch during long-distance integrated jacking construction; construction control is difficult, and the construction process is relatively complicated. Contents of the invention [0003] The invention aims to solve the problems that the construction of the main girder erection of the steel pipe concrete ar...

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Problems solved by technology

[0003] The invention aims to solve the problems that the construction of the main girder erection of the steel pipe concrete arch bridge with high piers across the Grand Canyon is difficult, the construction period is long, the construction technology is complicated, and the columns on the arch are flexible piers that are easy to be damaged by tension, and provide a steel concrete arch bridge Combined with the long-distance jacking construction method across the arch ring, the construction quality and efficiency can be improved, the construction period can be shortened, and the construction cost can be reduced

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