Hogging moment area low-shrinkage bridge structure and construction method thereof

Abstract

The invention discloses a hogging moment area low-shrinkage bridge structure and a construction method thereof. Basic filling of joints can be completed through prefabricated core blocks, so that cast-in-place of concrete is reduced. As core blocks are of a prefabricated structure, the shrinkage effect of concrete is basically eliminated, and the cracking risk of the concrete due to self reasons is reduced. And the joints and the core blocks are cast in place through the ultra-high performance concrete, so that the quality of the joints can be guaranteed only through a small amount of the ultra-high performance concrete, and economical efficiency and reliability are achieved. Besides, at least one layer of first reinforcing steel bars are embedded in the core blocks in the length directionof a bridge, multiple layers of second reinforcing steel bars are embedded at corresponding positions in a composite beam in the length direction of the composite beam, and when the core blocks are placed into joints, the second reinforcing steel bars can be mechanically connected or welded to the first reinforcing steel bars, so that the stress performance of the core blocks and the safety of the whole bridge structure are ensured. The invention aims to solve the technical problem that an existing hogging moment area joint structure is prone to shrinkage cracking.

Description

technical field [0001] The invention relates to the field of bridges, in particular to a bridge structure with low shrinkage in the negative moment area and a construction method thereof. Background technique [0002] At present, the conventional way to deal with the negative moment zone of concrete bridge structures is: first reserve the joints, and then cast in-situ concrete. In this treatment method, the amount of cast-in-place concrete is large, and the stress state in the negative moment area is greatly affected by the quality of the post-cast concrete, and the shrinkage effect of cast-in-place concrete can effectively cause cracks in the concrete at the top of the pier, thereby affecting the safety of the structure and durability. [0003] In order to improve the shrinkage effect, the improvement plan adopted by some construction parties is to change the cast-in-place concrete to cast-in-place UHPC (Ultra High Performance Concrete). However, this will lead to a large...

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a bridge structure with low shrinkage in the negative moment zone and its construction method. The bridge structure and construction method aim to solve the technical problem that the existing joint structure in the negative moment zone is prone to shrinkage and cracking

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