Beam strengthening method

Abstract

The invention relates to a beam strengthening method. The method comprises the following steps: firstly, chiseling a beam top anchorage groove on the top surface of a beam end, obliquely boring along the direction of two sides of a beam rib, and paving a positioning groove for fixing a prestressed steel wire buddle and a positioning tension sleeve along a beam web; mounting an anchorage plate; polishing the lateral surfaces and a bottom surface of a beam, and roughening a strengthening surface; mounting the steel wire buddle and the tension sleeve, namely arranging the positioning tension sleeve in the positioning groove of the positioning tension sleeve, threading the steel wire buddle from the anchorage plate at one end of the beam, placing the steel wire buddle into the positioning groove, then threading out the steel wire buddle from the anchorage plate at the other end of the beam, tightening the steel wire buddle and temporarily fixing the steel wire buddle by a rolling anchorage head; tensioning the steel wire buddle by using a tensioning jack or a winch at one end of the steel wire buddle, anchoring the steel wire buddle when reaching a design value, and then casting and sealing the wire buddle by concrete; implanting a pin into a beam body; after positioning and setting out a reinforcing steel bar on the beam body, binding reinforcement mats on the surface of the beam, and partially spot-welding the reinforcement mats; painting an interface agent; and plastering composite mortar. The method is active, ultra-strong and durable, can well overcome the main defects of the prior strengthening technology, and has strong effectiveness and economy.

Description

technical field [0001] The invention belongs to the field of civil structures, and in particular relates to a beam reinforcement method. Background technique [0002] At present, there are mainly two methods of structural reinforcement of bridges: passive reinforcement and active reinforcement. Passive reinforcement methods include: paste steel plate reinforcement method, high-performance composite mortar reinforcement (wire) mesh reinforcement method, etc. The traditional high-performance composite mortar reinforcement (wire) mesh reinforcement method is to use bolts or steel bars to anchor the steel mesh to the original structure, and then smear or spray a layer of composite mortar. The steel mesh improves the bearing capacity of the structure, and the mortar layer protects and Anchoring effect. Steel mesh high-performance composite mortar has a strong tensile strength to weight ratio and high crack resistance, toughness, ductility and durability. The construction proces...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at current structural strengthening methods: the reinforcing material in the high-performance composite mortar steel bar (wire) net is passively stressed, and only bears the internal force caused by the live load and the post-added dead load, and the strength of the material is difficult to exert, while the prestressed The steel wire bundle reinforcement method also has the problems of low shotcrete strength, poor combination with steel wire, and poor anchorage performance. A beam reinforcement method is proposed. Solve the main shortcomings of the existing reinforcement technology, with strong effectiveness and economy

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