Joint structure of NC-UHPC hybrid rigid frame bridge, hybrid rigid frame bridge and construction method of hybrid rigid frame bridge

Abstract

The invention discloses a joint structure of an NC-UHPC hybrid rigid frame bridge, the hybrid rigid frame bridge and a construction method of the hybrid rigid frame bridge. The hybrid rigid frame bridge comprises common concrete beam sections and ultra-high performance concrete beam sections, the ultra-high performance concrete beam sections are midspan beam sections, and the two ends of each ultra-high performance concrete beam section are connected with the corresponding common concrete beam section through the joint structure; the joint structure comprises a first connecting steel plate assembly, a second connecting steel plate assembly and a wet joint, and one end of the first connecting steel plate assembly is embedded in the end of a common concrete beam section and extends out of the end of the common concrete beam section; and one end of the second connecting steel plate assembly is embedded in the end of the ultra-high-performance concrete beam section and extends out of the end of the ultra-high-performance concrete beam section to be connected with the first connecting steel plate assembly. The hybrid rigid frame bridge solves the problems of midspan downwarping and web cracking of a common concrete large-span continuous rigid frame bridge, complex stress of a steel-concrete combined section of a common concrete-steel hybrid rigid frame bridge, and difficult maintenance of a steel box girder section.

Description

technical field [0001] The invention relates to the technical field of bridge design, in particular to a joint structure of an NC (common concrete)-UHPC (ultra high performance concrete) hybrid rigid frame bridge, a hybrid rigid frame bridge and a construction method thereof. Background technique [0002] Ordinary concrete continuous girder bridge (continuous rigid frame) has been applied earlier in the engineering field because of its good economy and mature construction technology, but some defects in ordinary concrete itself hinder its large-scale application: (1) Beam body cracking. The tensile strength of ordinary concrete is low, the beam body is easy to crack, and rainwater seeps in after cracking, and the corrosion and expansion of steel bars will aggravate the cracking or peeling of concrete. (2) Excessive downward deflection of the main beam. The shrinkage and creep effects of ordinary concrete are complex, and the long-term deflection of the main girder of ordin...

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a kind of seam structure of NC-UHPC hybrid rigid frame bridge, hybrid rigid frame bridge and construction method thereof, this joint structure construction is convenient, stress is good, and this hybrid rigid frame bridge bridge is light in weight, Low cost and good stress, it solves the problems of the mid-span deflection and web cracking of ordinary concrete long-span continuous rigid frame bridges, and the complex stress of the steel-concrete joint section of ordinary concrete-steel hybrid rigid frame bridges, and the steel box girder section Difficult to maintain

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