Construction method of rapid assembly of precast concrete panels to strengthen underwater structures

Abstract

The invention discloses a construction method for fast assembling precast concrete panels to reinforce an underwater structure. The method includes the steps that a pollution preventing film is arranged, temporary facilities are erected, the surface of the underwater structure to be reinforced is treated, the precast concrete panels are assembled, bottom sealing is performed, grouting is performed, prestress is applied, and the temporary facilities are torn down. With the method, reliable and fast reinforcement of the drainage-free underwater structure can be achieved, time cost and capital cost for maintenance and reinforcement of the underwater structure are reduced to the maximum extent, active reinforcement can also be performed, and the reinforcement quality and the reinforcement effect are further guaranteed.

Description

technical field [0001] The invention relates to a method for strengthening underwater structures, in particular to a method for quickly assembling and strengthening underwater structures such as bridge foundations, pier columns, and dam bodies by using prefabricated concrete segments, and belongs to the technical field of water conservancy engineering. Background technique [0002] Buildings such as houses, bridges, tunnels, dams, etc., as the service time increases, the structure will be damaged to varying degrees due to factors such as material aging, load increase, and external impact. These damages will seriously affect the structure. The continuous load-bearing capacity and durability will affect the safety of the building when it is serious, especially for the structure located under the water because its environment is more severe than that on the water, the problem is particularly prominent and serious. [0003] Especially in my country, as a country with many rivers...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current situation that the reinforcement of underwater structures is difficult, expensive, and long-term, the Chinese invention patent CN200910080051.9 discloses a "method for reinforcing underwater structures with fiber-reinforced composite grid bars", that is, divers first treat the reinforcement The surface of the structure is treated, and then the fiber-reinforced composite material grid bars are covered on the surface of the structure to be reinforced, and an isolation body is arranged outside the structure to be reinforced to ensure the sealing effect of the gap, followed by pouring underwater curing epoxy resin or other slurry , and finally remove the isolator

This method is an undrained reinforcement method, which solves the difficult problem of underwater structure reinforcement to a certain extent, but there are also some shortcomings: there are obvious secondary stresses between the structure to be reinforced and the part to be reinforced Effect, that is, the force lag of the post-reinforcement material, it is difficult to fully exert the restraint effect of the fiber-reinforced composite material grid reinforcement on the reinforced structure, which greatly wastes the material performance; because the grout injected takes a certain amount of time to solidify, so after grouting The isolation body cannot be dismantled immediately, which will greatly increase the time cost of reinforcement and reduce the turnover efficiency of the isolation body, and cause the corresponding temporary facilities to not be dismantled and reused in time, which will affect the progress and cost of the entire reinforcement project

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