Novel method for reinforcing concrete pier by implanting prestressed high-performance rib material into surface layer

Abstract

The invention relates to a novel method for reinforcing a concrete pier by implanting a prestressed high-performance rib material into a surface layer, which comprises the following steps of: slotting in a concrete protection layer on the surface of the concrete pier needing to be reinforced, and ensuring that the slotting depth does not exceed 2 / 3 of the thickness of the concrete protection layer; then implanting the high-performance rib materials into the groove, and applying prestress to the high-performance rib materials through a tensioning jack; after the prestress is applied in place, butt-welding the ends of the high-performance rib materials and finally sealing and filling a groove channel with a gel material so as to complete the repair of the surface of concrete. On the premise that the thickness of concrete on the surface layer of the pier is not increased, the grooved area and the non-grooved area on the surface of the pier form a whole, and the embedded pre-stressed rib material of the concrete pier is reinforced. According to the new method, the bearing capacity of the concrete pier with insufficient bearing capacity can be rapidly repaired and improved, the bearing capacity of the concrete pier can be improved to 1.4-2 times of the bearing capacity before reinforcement, wherein the reinforcement effect advantage is obvious, and the reinforcement construction process is simple.

Description

technical field [0001] The invention relates to the technical field of reinforced concrete bridge engineering, in particular to a new method for embedding prestressed high-performance bars on the surface to reinforce concrete bridge piers. Background technique [0002] In recent years, frequent earthquakes at home and abroad have caused countless casualties and property losses, seriously affecting social development. The bridge is one of the most critical elements in the infrastructure network of highway and railway transportation, and it is often a weak link under the action of an earthquake. As the most important anti-lateral force component in the earthquake resistance of the bridge structure, the bridge pier is also the most important component of the bridge structure under the earthquake. vulnerable parts. The failure of the bridge pier in the earthquake is mainly due to the insufficient ductility and shear resistance of the plastic hinge area, which is manifested in t...

AI Technical Summary

Problems solved by technology

The disadvantages are: ①The process is complicated, and it is necessary to drill holes in the concrete of the bridge pier, plant reinforcements, add steel wire mesh or structural stirrups, and then pour concrete; ③Concrete pouring also makes wet work very heavy, and the construction can only be carried out in the dry season of the river; ④Drilling and planting bars will destroy the inherent bearing capacity of the pier and the foundation, and the safety and security of the pier during construction will be damaged. Decreased stability; ⑤ There is a stress lag in the rear reinforcing layer, and when the bridge load increases, step failure may occur

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