Method for reinforcing underwater pier of bridge by using FRP pipe

Abstract

A method for reinforcing an underwater pier of a bridge by using an FRP pipe achieves reinforcing the underwater pier of the bridge by installing a positioning piece, wrapping with a steel wire mesh,manufacturing a self-locking FRP pipe, winding the self-locking FRP pipe, fixing the connecting part of the self-locking FRP pipe, activating the bottom sealing strip, and pouring filling material, wherein the self-locking FRP pipe is fastened by the moving clamp of per se, and underwater adhesive is injected into the glue injection cavity of the moving clamp so that the self-locking FRP pipe is bonded into a whole body, and the filling material is injected into the gap formed between the self-locking FRP pipe and the pier to be reinforced so as to finish the reinforcing of the underwater pierof the bridge. According to the invention, the process is simple, the self-locking type FRP pipe is fastened at one time, pre-fastening by using a belt is not needed, the construction process is reduced, the anti-corrosion performance is good, a cofferdam or a formwork is not needed, the labor intensity of workers is reduced, the pier can be directly reinforced under the water, the influence on achannel is reduced, the method has wide applicability, the construction is quick and convenient.

Description

technical field [0001] The invention relates to a method for strengthening an underwater structure of a bridge, in particular to a method for strengthening an underwater pier of a bridge with an FRP pipe, and belongs to the technical field of civil engineering. Background technique [0002] As a country with many rivers and lakes, a large number of railway bridges and highway bridges connect land transportation into a network. With the increase of bridge operation time and the increasing traffic volume, various problems continue to emerge. Compared with the upper structure of the bridge, the lower part The damage of underwater structures is more common and difficult to be found. Loads caused by high underwater static stress, water flow impact, ship impact, erosion, freeze-thaw cycle in severe cold areas, etc. can easily lead to the formation of bridge underwater structure damage. Such as peeling of the concrete cover, cracks, exposed bars, steel bar corrosion, and undercutti...

AI Technical Summary

Problems solved by technology

[0003] Due to the inconvenient large-scale regular maintenance of underwater bridge piers, diseases are often not discovered in time. The safety factor of the lower structure is relatively large when designing bridges, which is regarded as a relatively safe part, and the later safety inspection is often ignored. The disease is not treated in time, and due to the difficulty of construction in the underwater environment and the specific applicability of the treatment method, it is of great significance to study the reinforcement technology of underwater bridge piers

Commonly used bridge pier reinforcement methods mainly include enlarging section reinforcement method, bonded steel reinforcement method, external prestressed reinforcement method and wire winding reinforcement method, etc. There are their own deficiencies. The construction period of the enlarged section reinforcement method is longer, and there are many wet operations on site, which has a great impact on the surrounding environment; the bonded steel reinforcement method has higher requirements on the strength of the matrix concrete, and the reinforcement quality depends largely on the cement. The quality of the material and the level of construction technology; the construction process of the external prestressed reinforcement method is complicated, and the loss of prestress is large; the wire-wrapped reinforcement method also has problems such as cumbersome construction technology in underwater undrained construction

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