Assembled large-span ultra-high performance concrete (UHPC) box girder combined node and connection method thereof

Abstract

The invention discloses an assembled large-span ultra-high performance concrete (UHPC) box girder combined node. The assembled large-span UHPC box girder combined node comprises a box girder main bodyand prestressed tie rods, wherein the joint of the box girder main body is provided with a zigzag joint; protruding bars are pre-embedded into the second butt joint face of the zigzag joint; prestressed tie rod through holes are pre-embedded from the first butt joint face of the zigzag joint to the back of the zigzag joint; the box girder main body is connected by the pre-embedded protruding bars, the prestressed tie rod through holes and the corresponding prestressed tie rods; and the joint is filled with a concrete grouting material. The assembled large-span UHPC box girder combined node further comprises a steel anchoring block connection system, wherein the steel anchoring block connection system comprises L-shaped steel anchoring blocks and pre-tightening bolts; steel anchoring blocks are arranged above the zigzag joint of the box girder main body; and the pre-tightening bolts are arranged on the steel anchoring blocks. The invention also discloses a connection method of the assembled large-span UHPC box girder combined node. The assembled large-span UHPC box girder combined node disclosed by the invention is simple in structure, reasonable in design, convenient in transportation, short in construction period, high in quality, good in mechanical behavior and durability and low in post-maintenance, transportation and installation costs.

Description

technical field [0001] The invention relates to the technical field of bridge engineering, in particular to an assembled large-span ultra-high-performance concrete box girder combined node and a connection method thereof. Background technique [0002] At present, my country's bridge construction mainly adopts traditional cast-in-place construction or prefabricated beam end splicing construction. The traditional cast-in-place construction uses post-cast concrete or grouting technology to make the components meet the load-bearing requirements. However, there are many wet operations during the construction of post-cast concrete, the construction period is too long, and once damaged, it is not easy to repair, and the economic benefit is low. Compared with pouring-in-place construction, single mechanical connection construction of prefabricated beams is more convenient, the transportation cost of large prefabricated components is high and the installation process is complicated,...

AI Technical Summary

Problems solved by technology

However, there are many wet operations in the construction of post-cast concrete, the construction period is too long, and it is not easy to repair once damaged, and the economic benefit is low

Compared with pouring-in-place construction, single mechanical connection construction of prefabricated beams is more convenient, the transportation cost of large prefabricated components is high and the installation process is complicated, and the bearing capacity of prefabricated components is insufficient, the seismic performance of joints is not ideal, and it is easy to occur under mechanical load. Brittle failure, various factors limit the application and development of prefabricated bridges in bridge engineering

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