Arching method for stiff skeleton concrete arch bridge

Abstract

The invention belongs to the technical field of bridge engineering, and particularly relates to an arching method for a stiff skeleton concrete arch bridge. The arching method sequentially includes the following steps that A, segments of an arch ring stiff skeleton are spliced till the segments are folded; B, concrete in steel pipes of the arch ring stiff skeleton is pressed and poured; C, secondary fastening cables are tensioned; D, outer wrapped concrete of the arch ring stiff skeleton is poured; and E, the secondary fastening cables are detached. According to the arching method, due to tensioning of the secondary fastening cables, in the outer wrapping pouring process, no other supporting components need to be arranged for supporting the arch ring stiff skeleton; firstly, the construction cost is reduced, and the construction difficulty is lowered; meanwhile, due to the fact that the fastening cables are used for tensioning the arch ring stiff skeleton, the occupied space is smaller than that of other supporting manners during connection of the fastening cables and an arch ring; and blocking in the following concrete pouring process is reduced, and following concrete pouring construction is further facilitated.

Description

technical field [0001] The invention belongs to the technical field of bridge engineering, and in particular relates to an arching method for a stiff skeleton concrete arch bridge. 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 high-alpine and canyon terrains need to be crossed by long-span arch bridges. 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 of reinforced concrete arch br...

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Problems solved by technology

[0004] However, the inventors of the present application have found that the traditional arching method still has deficiencies. Due to the lack of effective means to adjust the stiffness of the skeleton stress in time during the outsourcing concrete pouring process, in the outsourcing concrete construction process, in order to ensure the stiffness The deformation of the skeleton is uniform and all parts are always in a state of compression, as well as meeting the stress requirements of the rigid skeleton during the pouring process. Therefore, in the current outsourcing concrete construction, small-segment pouring is used, and the amount of concrete poured at one time is very limited. At present, the amount of concrete poured in a single pour generally does not exceed 300 cubic meters. In this way, the entire outsourcing concrete pouring process requires a long construction period and many processes, which seriously affects the construction period and construction cost of the bridge.

At the same time, due to the use of small segment pouring, in order to maintain the uniform stress of the skeleton arch ring, it is necessary to adopt multi-face load pouring to maintain the balance of the arch ring, which not only further increases the construction difficulty, increases the construction cost and construction period, but also multi-face and sub-section Segmental pouring will inevitably lead to many joints in the arch ring, cumbersome construction steps, high safety risks and long construction period

[0005] On the other hand, the traditional stiff frame construction method lacks the necessary means to adjust the internal force of the arch ring during the outsourcing concrete construction stage, resulting in excessive stress at local positions in the stiff frame and uneven stress on the arch ring, which further affects The overall mechanical properties of the concrete arch ring

[0006] It is precisely because of the above shortcomings that the further development of this construction method on larger railway long-span concrete arch bridges is also limited.

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