A Reinforcement Method for Reinforced Concrete Arch Bridge Based on Thermal Expansion Principle

Abstract

The invention discloses a method for reinforcing a reinforced concrete arch bridge based on the principle of thermal expansion, and belongs to the technical field of arch bridge reinforcement and the technical field of building construction. This reinforcement method is aimed at the statically indeterminate structure of the hingeless arch. Using the principle of thermal expansion, the concrete arch ring is reversely lifted by causing the steel structure to heat up and expand, so that the two are mutually tightened and coordinated to bear the force, which can effectively improve the arch ring shape and optimize the arch ring. The stress state of the concrete can avoid the problem that the reinforced joint surface is easy to fall off. The use of steel structure reinforcement can not only greatly increase the section stiffness of the arch ring, but also make full use of the high yield strength of steel to greatly increase the ultimate bearing capacity of the arch ring. The reinforcement method is simple and convenient, the construction quality is guaranteed, and the reinforcement efficiency is high and the effect is good.

Description

technical field [0001] The invention belongs to the technical field of arch bridge reinforcement, and in particular relates to a method for reinforcing a reinforced concrete arch bridge based on the principle of thermal expansion. Background technique [0002] At present, there are tens of thousands of reinforced concrete arch bridges in my country, among which small and medium-span reinforced concrete arch bridges account for the vast majority, and most of them are distributed on low-grade highways such as national highways, provincial, county and township roads. With the rapid growth of the domestic economy, the traffic volume and the design load level of automobiles are gradually increasing. Due to the long service life of the existing large number of small and medium-span reinforced concrete arch bridges, they can no longer meet the long-term needs of the transportation development of the times. Moreover, under the current traffic flow, it is inconsistent with the origin...

AI Technical Summary

Problems solved by technology

[0005] Disadvantages: ① Construction processes such as chiseling, reinforcement, formwork, concrete pouring, and maintenance are required, and the size of the enlarged section is small, the entire construction process is complex and difficult, and the construction quality is difficult to guarantee; ② The shrinkage and creep of the new and old concrete are inconsistent , it is easy to cause the joint surface to fall off; ③The newly added concrete has a limited increase in the ultimate bearing capacity of the entire arch bridge due to the lower yield strength of the material itself and stress hysteresis

[0008] Disadvantages: ①The durability of the paste material is easy to fail, resulting in the peeling of the steel plate (carbon fiber cloth); ②The improvement of the section stiffness of the arch ring and the ultimate bearing capacity of the arch bridge is very limited, and the reinforcement efficiency is low

[0011] Disadvantages: ①The installation of anchorage is complicated and difficult to control the loss of prestress, and the maintenance is difficult; ②It can only partially improve the stress condition of the arch ring, and the improvement of the section stiffness of the arch ring and the ultimate bearing capacity of the arch bridge is very limited, and the reinforcement efficiency is low

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