Concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer)

Abstract

The invention discloses a concrete structure reinforcing method based on near surface mounted prestressed FRP (Fiber Reinforced Polymer), which comprises the steps of: 1, slotting, arranging more than one preformed groove on a concrete structure to be reinforced; 2, installing a tensioning tool of an FRP strip and an FRP strip clamp; 3, tensioning internal FRP strips in the tensioning tool and the FRP strip tool so that the internal FRP strips are tensioned, placing the internal FRP strips in the preformed groove, filling an adhesive, keeping a clamping and anchoring state for a period of time and then curing; and 4, relaxing: when adhesive resin is cured completely to reach the strength, dismantling the FRP strip clamp. The concrete structure has the advantages of low cost, convenience for construction, long service life, good reliability and the like.

Description

technical field [0001] The invention mainly relates to the technical field of concrete structure reinforcement, in particular to a method for reinforcing the concrete structure by embedding prestressed FRP slats on the surface. Background technique [0002] Due to environmental erosion, increased load, improper maintenance and other reasons, the phenomenon of damage or further aggravation of the built concrete structures, such as bridges and building structures, has become increasingly prominent, causing serious structural safety hazards and threatening people's lives and properties Safety. Therefore, it is of great practical significance for the development of infrastructure construction to research and develop new, practical, superior performance and low-cost structural reinforcement technologies and apply them to a large number of existing concrete structure reinforcements to improve the bearing capacity and safety performance of in-service structures. [0003] Fiber Rei...

AI Technical Summary

Problems solved by technology

On the one hand, the inconsistency between the elastic modulus and material strength of FRP makes it difficult for the external bonding process to exert the high-strength performance of this material; The destruction of brittle characteristics causes the structure to lose its load-bearing capacity before fully exerting the properties of FRP materials

[0004] In vitro paste prestressed FRP technology is proposed for the inconsistency of material modulus and strength in the externally attached FRP reinforcement method, and it is difficult to exert the defect of material strength. A certain strength, thereby improving the strength utilization rate of the material, but this technology has not completely solved the peeling problem between FRP-concrete; at the same time, due to the limited bonding ability provided by the bonding resin in the external pasting method, it is impossible to realize the pre-fabricated concrete. For stress FRP anchorage, additional permanent FRP anchors must be installed, which increases the cost of applying FRP to strengthen engineering structures

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