Concrete bridge reinforcing method and structure

Abstract

The invention discloses a concrete bridge reinforcing method and structure. The concrete bridge reinforcing method includes the following steps that firstly, at least two first anchoring seats (1) are fixed to one end of a pulled region of a concrete bridge body in a transversely-staggered manner through anchoring bolts along a concrete bridge (7) and second anchoring seats (2) are fixed to the other end of the pulled region in a transversely-staggered manner through anchoring bolts along the concrete bridge, wherein the number of the second anchoring seats is the same as that of the first anchoring seats; secondly, the two ends of each pre-stressed reinforcement (3) are installed on the corresponding first anchoring seat and the corresponding second anchoring seat, each first anchoring seat and the corresponding second anchoring seat are provided with one pre-stressed reinforcement, and the pre-stressed reinforcements are parallel; and thirdly, the pre-stressed reinforcements are tensioned to form the reinforcing structure. By the adoption of the reinforcing method, local stress concentration of the concrete bridge can be avoided, the size is small, the dead weight is low, the anti-cracking reinforcing effect can be guaranteed, and the bending resisting and reinforcing efficiency is high.

Description

technical field [0001] The invention relates to the field of strengthening bridges with an external prestressing method, in particular to a concrete bridge strengthening method and a strengthening structure. Background technique [0002] External prestressing method is a commonly used method in the field of bridge reinforcement. This method applies external force (generally eccentric setting) to the original beam structure by adding reinforcement materials and reinforcement structures. The effect of external prestressing effect is opposite to that of external load effect. , so that the beam body can store a certain amount of precompression stress to partially offset the structural self-weight effect or live load effect, thereby significantly improving the crack resistance and bearing capacity of concrete bridges, especially prestressed concrete bridges. [0003] In the field of engineering, the commonly used external prestressed reinforcement material is the prestressed stee...

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Problems solved by technology

[0004] However, in the existing external prestressing beam reinforcement method, the anchor beam as a whole bears the prestress generated by all the prestressing beams, resulting in the prestress usually concentrated on the same section and the same point, and the anchoring force is relatively concentrated, which is not conducive to stress diffusion. The relative concentration of the anchoring force inevitably requires the anchoring beam and the steering beam to have a larger size. At the same time, it is necessary to lay and stretch a certain number of transverse prestressed beams in the beam to reduce the principal stress in the anchorage area.

Due to the large self-weight of the reinforcement system (the weight of the additional structure accounts for about 8% to 10% of the original structure), the reinforcement efficiency of the reinforcement system to the original bridge structure is correspondingly reduced. In addition, the self-weight of the reinforcement system will also increase the burden on the pier and foundation. Suitable for some bridges with limited installation space

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