Beam section replacement reinforcement method for large-span concrete continuous beam bridge

Abstract

The invention discloses a beam section replacement reinforcement method for a large-span concrete continuous beam bridge. The method comprises the steps as follows: a replacement concrete beam section is cut from a to-be-reinforced span of a concrete continuous beam and hoisted; two fixed sections are formed after the to-be-reinforced span is cut, and reinforced concrete joints are arranged on cutting end surfaces of the two fixed sections; a steel beam is hoisted to the position between the two steel reinforced concrete joints and connected with the reinforced concrete joints. The steel beam substitutes for a replacement concrete beam section with diseases, and accordingly, diseases such as mid-span deflection, cracking and the like can be completely treated, the bridge deck line shape is improved, and the total bearing capacity of the concrete continuous beam bridge is also improved; the method has the advantages of being safe, reliable, good in operability and high in practicality and can be used for maintenance and reinforcement of large-span concrete continuous beam (rigid framework) bridges.

Description

technical field [0001] The invention relates to a reinforcement technology for concrete bridges, in particular to a beam segment replacement reinforcement method for large-span concrete continuous beam bridges. Background technique [0002] In China, the construction of large-span concrete continuous beam (rigid frame) bridges began in the 1970s. Because of its good adaptability and economy, it has quickly become the most competitive bridge type within the span of 60m to 300m, and is widely used. Large-scale highway bridges and municipal viaducts. Due to the imperfect bridge structure design and material theory at that time, the increasing traffic volume, the limitation of maintenance management and the harsh natural conditions in recent years, various problems and structural diseases of some bridges were caused, mainly manifested as cracking (“ Problems such as “web cracking”, “bottom plate cracking”, “roof plate cracking”) and “span mid-span deflection”, the light ones wi...

AI Technical Summary

Problems solved by technology

One is to increase the dead load reinforcement method, which increases the bearing capacity and increases the dead load of the structure at the same time, mainly including the method of pasting steel plates, increasing the section method, etc. Most of them are passive reinforcement methods, and the reinforcement efficiency is low

The second is to basically maintain the constant load reinforcement method, such as changing the structural system reinforcement method, external prestressed reinforcement method, etc., which are active reinforcement methods. Theoretically, the reinforcement effect is better, but the durability and reliability need to be improved

The third is to reduce the dead load reinforcement method, which mainly includes reducing bridge deck pavement and replacing light guardrails. It is an active reinforcement method, but because most of it is to reduce the weight of auxiliary structures, the reinforcement effect is limited

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