Large-span reinforced concrete arch bridge cantilever construction structure and method under combined system

Abstract

The invention discloses a large-span steel concrete arch bridge cantilever construction structure and method under a connecting sleeve and a combined system. The construction structure comprises a cable-stayed buckling system, an arch ring section, a suspension system and a post-cast strip. Wherein the suspension system is used for hoisting arch ring sections, the arch ring sections are factory prefabricated sections, all the arch ring sections are connected in sequence, and the connecting positions between all the arch ring sections are used for pouring a post-pouring belt. According to the method, the arch ring prefabricated section is hoisted through the hoisting cable of the suspension system and moved to the designated position to conduct current prefabricated section, prefabricated section assembly and post-cast strip pouring construction are completed, meanwhile, before the buckle cable and the anchor cable are tensioned, a part of cantilever section load is borne, and the construction efficiency is improved. The influence of additional bending moment and vertical force generated by cantilever load on buckling tower deviation, cable force and stress of poured sections is reduced; according to the cable-stayed system, initial tension is applied to the anchor cables anchored to the foundation and the buckling tower and the buckling cables anchored to the buckling tower and the arch ring section, and it is guaranteed that the line shape and stress of the completed arch ring section meet the design requirements.

Description

technical field [0001] The invention relates to a cantilever construction structure and method for a large-span steel concrete arch bridge under a combined system, belonging to the field of bridge construction in civil engineering. Background technique [0002] The terrain in the western mountainous area is steep, with many canyons and complex geological conditions. The top-loaded reinforced concrete arch bridge has low construction cost and simple maintenance. At the same time, the reasonable span can cross the canyon in one span without setting piers in the middle. Many advantages lead to this type of bridge. Arch bridges are widely used. In the construction of the arch ring of the arch bridge, the cantilever pouring construction technology of the cable-stayed buckle has been vigorously promoted in the construction process of the large-span reinforced concrete arch bridge in China. Tension buckle and anchor cable" are used as a segmental pouring procedure, and the constru...

AI Technical Summary

Problems solved by technology

At the same time, during the construction process, improper control of the buckle cable force will cause tensile stress on one side of the concrete of the arch ring, and the tensile stress will exceed the tensile strength of the concrete, which will lead to concrete cracking

Due to the above reasons, the length and weight of the cast-in-place segments of the arch bridge are limited to a certain extent, and more cast-in-place segments need to be divided during the design process, resulting in a continuous increase in the construction period. With the continuous increase of the span of the arch bridge, the above The problem is more prominent

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