A Double Cantilever Construction Method for Extremely Asymmetric Composite Beams

Abstract

The invention discloses a double suspension arm construction method of an ultra-asymmetry combined beam and relates to the field of cable-stayed bridge main girder construction. The construction method comprises the following steps of using the existing method to pour a first midspan steel beam, suspending and pulling a first sidespan stay cable and a first midspan stay cable, pouring a second midspan steel beam, manufacturing a template used for manufacturing a second sidespan concrete beam, installing a third midspan steel beam, suspending and pulling a third midspan stay cable, pouring half concrete at the top part of the template, pulling a second sidespan stay cable, pouring the other half concrete at the top part of the template until the line of the template reaches the calculating requirement, obtaining a second sidespan concrete beam, installing a steel beam bridge deck slab at the top part of the third midspan steel beam and pulling the third midspan stay cable. The difference between the constructed bridge line and the preset designed line is small, and the constructed beam is safer.

Description

technical field [0001] The invention relates to the field of main girder construction of cable-stayed bridges, in particular to a double-cantilever construction method of an extremely asymmetric composite beam. Background technique [0002] The main girder materials of cable-stayed bridges usually use steel girders, concrete girders, composite girders combined with steel girders and concrete bridge decks, or composite girders. The cable-stayed bridge has a large unbalanced moment in the side span and the middle span. During the construction process, the root of the cable-stayed bridge is prone to excessive bending moments, resulting in instability of the cable-stayed bridge. In order to solve the above problems, the cable-stayed bridge In the process of bridge construction, auxiliary piers are usually set at the bottom of the side span of the bridge, or the side span of the bridge is constructed by cast-in-place support method. [0003] Under special terrain and geological ...

AI Technical Summary

Problems solved by technology

[0005] Due to the large difference between the construction process of cantilever cast concrete beams and the construction process of cantilever assembled composite beams, it is difficult to maintain the balance of side spans and mid-spans during symmetrical construction, and it is necessary to set ballast on the installed mid-span beams; At the same time, due to the large difference between the quality of concrete beams and composite beams, after symmetrical construction, it is easy to cause deviations between the alignment of the bridge and the pre-designed alignment, which in turn reduces the structural safety and durability of the bridge.

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