Large-span steel box hybrid beam short combination section structure of high-speed rail

Abstract

The invention discloses a large-span steel box hybrid beam short combination section structure of a high-speed rail which comprises a steel top plate, a steel bottom plate and a bearing plate, and thebearing plate is clamped between the steel top plate and the steel bottom plate and divides a steel box hybrid beam short combination section into a steel-concrete combination section and a steel beam transition section in the longitudinal bridge direction. Two steel webs of the transition section divide the steel beam transition section into a box girder outer chamber, a box girder compartment and a box girder inner chamber in the transverse bridge direction, PBL steel bars transversely penetrate through PBL perforated steel plates and C-shaped perforated steel plates on a steel top plate and a steel bottom plate of the steel-concrete combined section, and a concrete partition wall is poured in the steel-concrete combined section; the transition section steel top plate, the bottom and the web plate are provided with prestressed tendon anchor chambers, longitudinal prestressed reinforcements are anchored in the prestressed tendon anchor chambers, and the prestressed reinforcements penetrate through the bearing plate and the steel-concrete combined section and are anchored on the concrete beam section behind the combined section so as to reinforce connection between the bearing plate and the concrete partition wall. A short combination section structure has the advantages of being simple in structure, short in combination part, high in bearing capacity, convenient to constructand small in operation and maintenance workload.

Description

technical field [0001] The invention relates to the field of design and construction of bridge engineering, in particular to a short joint section structure of a large-span steel box composite beam for high-speed railways. Background technique [0002] The side spans of steel-concrete composite box girder cable-stayed bridges use concrete girders, which can balance the self-weight of the mid-span and long-span steel girders, and the side-span concrete girders can also increase the overall rigidity of the main girder. In addition, the side-span concrete girders reduce the steel consumption of the whole bridge, which improves the economy and subsequent maintenance costs. The steel-concrete joint transmits huge internal force of the main girder between the two materials, which has the characteristics of complex structure and complex force transmission; most of the existing mixed-girder cable-stayed bridges are highway bridges. High, resulting in less application in railway bri...

AI Technical Summary

Problems solved by technology

The steel-concrete joint transmits huge internal force of the main girder between the two materials, which has the characteristics of complex structure and complex force transmission; most of the existing mixed-girder cable-stayed bridges are highway bridges. High, resulting in less application in railway bridges

[0003] Among the long-span steel-concrete composite box-girder cable-stayed bridges for railways, the Ningbo Railway Hub Yongjiang Super Bridge and the Shenmao Railway Tanjiang Super Bridge both use a steel-concrete joint section, and the form of the steel-concrete joint section of the two is the same, both There are front and rear pressure-bearing plates in the cell, but the joint sections of the two are long. Although it has the advantages of uniform force transmission and coordinated deformation, the structure is relatively complex, there are many components, the construction is inconvenient, and the local self-heaviness is insufficient.

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