A self-anchored steel box tied arch bridge system conversion method with arch first and beam later

Abstract

The invention discloses a self-anchored steel box tie bar arch bridge system conversion method, comprising: installing permanent supports and temporary supports on pier columns, cast-in-situ arch seats and beams, and assembling arch rib segments; Stretch the suspenders and the first batch of permanent tie rods, loosen the temporary buckle cables for the installation of the arch rib step by step, install the steel girder and tension the suspenders, tension the second batch of permanent tie rods, and remove the temporary supports; the first phase of installation Prefabricated bridge deck and poured wet joints, adjusted and consolidated steel girder segments, tensioned the third batch of permanent tie rods; installed phase II prefabricated bridge decks and poured wet joints, poured between steel main girders and abutments and beams Cast-in-place bridge deck, install and tension the remaining permanent tie rods to complete the conversion of the whole bridge system. The present invention uses the permanent tie rods of the bridge itself as temporary tie rods to lock, avoiding the addition of temporary tie rods in traditional construction, reducing the input of temporary tie rods, and transferring the horizontal force and vertical force of the abutment to the bridge through the permanent support and the temporary support. The pier column under the abutment reduces the use of brackets.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to a system conversion method of a self-anchored steel box tie rod arch bridge with arch first and then beam method. Background technique [0002] With the development of bridge construction in our country, the steel box tied arch bridge has the characteristics of large span, light structure, beautiful shape, and low material consumption. In recent years, the application of steel box tied arch bridge has become more and more extensive. [0003] The under-connected steel box tied arch bridge is mostly a non-thrust structure. The horizontal thrust of the arch foot is balanced by tensioning flexible tie rods or tie beams. The arch ribs are generally double-rib arches. Overall stability. This type of bridge is mostly constructed by the method of beam first and then arch, which is convenient for the overall alignment control of the bridge on the one hand, and on the other han...

AI Technical Summary

Problems solved by technology

However, for the construction of large-span self-anchored steel box-tied arch bridges in mountainous deep reservoir areas, due to high environmental protection requirements, limited space, and a large amount of support work, cable cranes are used to install steel box-tied arch bridges with arches first and girders behind is a proven method

When the steel box tie-rod arch is installed by the cable-hanging arch first and the girder method, the entire system of the arch bridge changes at any time. In conventional construction, the line shape and system of the entire bridge are usually converted by adding temporary external prestress in tension, and a large number of bridges are installed at the arch foot. Supported by the support of the steel box tie-bar arch bridge, avoiding the horizontal thrust of the arch foot or the displacement of the arch foot during the installation of the steel box tie-bar arch bridge, the conversion of this system requires a lot of materials, long construction period and high cost. Type steel box tie rod arch bridge system conversion method with arch first and then beam method to save the amount of temporary materials, shorten the construction period and reduce the construction cost

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