Construction method of extra-long-span stiff skeleton

Abstract

The invention discloses a construction method of an extra-long-span stiff skeleton. The method comprises the following steps that fastening stay systems are erected at the two ends of a valley, sections are symmetrically spliced from the two edges of arch supports to obtain preset sections, stiff skeleton sections are spliced from the wide end of the valley to the narrow end of the valley till thesections are folded, and an arch ring stiff skeleton is obtained; in-pipe concrete is pressed and injected into a steel pipe of the arch ring stiff skeleton; after the in-pipe concrete reaches the design strength, outer wrapped concrete of the arch ring stiff skeleton is poured. By adopting the first-symmetric and then-asymmetric mode, only one hoisting platform is arranged, construction is greatly facilitated, safety is ensured, the project duration and cost are saved, construction difficulty caused by a steep terrain and a narrow construction plant is overcome, and the long-span stiff skeleton is smoothly installed.

Description

technical field [0001] The invention relates to a construction method in the field of building construction research, in particular to a construction method for a super-large-span stiff frame. Background technique [0002] With the rapid development of high-speed railways in my country, especially in the construction of railways in southwest mountainous areas, more and more large-span arch bridges are needed to cross alpine and canyon terrains. Compared with arch bridges made of other materials, reinforced concrete arch bridges have the advantages of high rigidity, small temperature deformation, and good economy, and can better meet the requirements of high-speed railways for bridge structures. Based on the above reasons, in the process of high-speed railway construction, if it is necessary to build a long-span arch bridge, a reinforced concrete arch bridge is the preferred option. [0003] It is precisely because of the above-mentioned advantages that reinforced concrete a...

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Problems solved by technology

[0004] However, the rigid frame in the prior art generally adopts the symmetrical assembly of the arch ring rigid frame until it is closed, but this method has relatively high requirements on the terrain environment, and there is enough space to build a lifting platform

And for the terrain of some alpine valleys, there is not enough space to build a suitable lifting platform, so the existing construction method of stiff skeleton cannot be used

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