Rapid prestress FRP grid reinforcing method

Abstract

The invention discloses a rapid prestress FRP grid reinforcing method. The rapid prestress FRP grid reinforcing method comprises the following steps that (1) the surface of a to-be-reinforced concretestructure is cleaned; (2) prestress anchorage devices are mounted on the surface of the structure; (3) the surface of the structure is coated with a layer of interface agent; (4) the two ends of an FRP grid are fastened in the prestress anchorage devices correspondingly, and then the prestress anchorage devices are tensioned; (5) the middle of the FRP grid is sealed and coated with polymer mortar, and the two ends of the FRP grid are sealed and coated with geopolymer mortar; and (6) after the geopolymer mortar at the two ends reaches the design strength, the prestress anchorage devices are dismounted, and the middle polymer mortar continues to be cured till the middle polymer mortar reaches the design strength. The reinforcing method is simple in process and low in cost, reinforcing can be completed within a short time, the stress performance of the damaged part of the concrete structure is effectively improved, and the bearing capacity and durability of the structure are improved.

Description

technical field [0001] The invention relates to the technical field of civil engineering and traffic structure reinforcement, in particular to a fast prestressed FRP grid reinforcement method, which is used to improve the mechanical performance of structures by using FRP grids in old building structures. Background technique [0002] As the service time of the building structure increases, the structure will gradually age, especially in harsh environments, the degree of structural aging will be more serious. The aging of reinforced concrete structures is the result of the joint action of steel bar corrosion, concrete deterioration, and service load changes, which reduces the durability and usability of the structure. This is an irreversible process. At present, a large number of reinforced concrete structures in my country are aging, which leads to the gradual destruction of concrete structures, continuous deterioration of performance, lower bearing capacity, and endangers t...

AI Technical Summary

Problems solved by technology

However, the utilization rate of the strength of FRP mesh strengthened by ordinary external paste is low, and the reinforcement effect lags behind, which limits the further popularization and application of FRP mesh

In some reinforcement methods, prestressing is applied to FRP to improve the reinforcement effect, but the tension anchor device is generally used as a permanent mechanical anchor and will not be removed after tensioning. For the reinforcement of other parts of the structure, a new tension anchor device is required to complete. Therefore, the project Reinforcement requires multiple sets of tension anchoring devices, and the cost of materials is relatively high

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