A Steel-Concrete Mixed Composite Continuous Rigid Frame Bridge

Abstract

The invention discloses a steel-concrete mixed composite continuous rigid frame bridge, which comprises several prestressed concrete beam sections, mid-span steel box composite beam sections connected between adjacent prestressed concrete beam sections, prestressed concrete beam sections located at both ends Connect side-span steel box composite girder sections; mid-span steel box composite beam sections and side-span steel box composite beam sections both include steel box girders, and the top of the steel box girders is connected with a roof concrete bridge deck that is continuous along the line longitudinally; The bottom of the steel box girder of the beam section is connected with a floor concrete slab that is continuous longitudinally along the line. In the continuous rigid structure described in the present invention, the side-span steel box composite beam section adopts the double-layer steel box composite beam section form, that is, the concrete slab is laid on the top and bottom slabs of the steel box girder. Participating in the overall force, the beam end angle is reduced, thereby ensuring the safety of train operation and the stability of the track structure, and can effectively improve the shrinkage and creep of the steel-concrete hybrid continuous rigid frame and the beam end angle.

Description

technical field [0001] The invention relates to the field of bridges, in particular to a steel-concrete hybrid composite continuous rigid frame bridge. Background technique [0002] The continuous rigid frame of railway is mainly prestressed concrete continuous rigid frame. The prestressed concrete continuous rigid frame has the advantages of large span, high structural rigidity, mature construction technology and good durability. Disadvantages such as becoming larger. The long-span railway concrete continuous rigid frame bridges that have been built so far include the Yumo Railway Amojiang Super Bridge with a span of (116+212+116) m; the Niujiaoping Bridge on the second line in Xiangyu with a span of (100+192+100) m, etc. From the existing engineering examples, the maximum span of the continuous rigid frame of the railway is about 200m, and the track structure is all ballast track, and the shrinkage and creep of the beam body is also relatively large. However, there are n...

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Problems solved by technology

[0006] The purpose of the present invention is: aiming at the prestressed concrete continuous rigid structure existing in the prior art, the spanning capacity is small, and the shrinkage and creep are relatively large; the ballastless track slab base and the steel bridge deck in the steel-concrete hybrid continuous rigid structure cannot be directly connected , the fatigue problem of the steel bridge deck; and the steel box composite girder is used in the steel-concrete mixed composite continuous rigid frame side span section, and the rotational stiffness of the beam body is significantly lower than that of the pure concrete side span, resulting in a large beam end angle and safety. Reduce the problem of not being able to meet the requirements of high-speed railway specifications, and provide a steel-concrete hybrid composite continuous rigid frame bridge

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