Device and method for reinforcing flexural concrete member

Abstract

The invention discloses a device and a method for reinforcing a flexural concrete member. The method comprises the following steps of: forming grooves in two ends of a tensile surface of a reinforced concrete member, respectively pressing steel plates with reserved holes at two ends of the member, and tensioning steel strands, so that a counter-force table is formed between the steel plates and the concrete member; embedding steel clamps for adhering and clamping the ends of a fiber reinforced composite material into the grooves, anchoring the clamp at one end into concrete through anchor bolts, and connecting the clamp at the other end by utilizing bolts and an overlap steel block; taking a high-strength bolt which penetrates through the steel plates and is connected with the overlap steel block as a tensioning rod, and tensioning the fiber reinforced composite material by utilizing a lifting jack; and finally, adhering the fiber reinforced composite material, anchoring the clamp at the tensile end into concrete, adhering U-shaped hoops at two ends of the reinforced concrete member, and gradually releasing the prestress in a graded mode after the adhesives are cured. The reinforced concrete member serves as a tensile counter-force table, a complex tensioning device is prevented from being manufactured, and the problem that the prestressed fiber reinforced composite material cannot be anchored is solved.

Description

technical field [0001] The invention relates to a device and method for strengthening a flexural concrete member, in particular to a device and method for reinforcing a flexural concrete member with a prestressed fiber reinforced composite material sheet, which belongs to the transformation technology of the device and method for strengthening a flexural concrete member . Background technique [0002] Concrete damage caused by construction defects, corrosion, overloading or fatigue has led to certain safety hazards in structures such as bridges, tunnels, industrial plants and offshore platforms in service. These damaged concrete structures are usually reinforced by means of reinforcement. meet current usage standards. In recent years, fiber-reinforced composite sheets (including plates and cloths) have been widely used in concrete structure reinforcement projects due to their light weight, high stiffness and strength, and strong corrosion resistance and fatigue resistance. ...

AI Technical Summary

Problems solved by technology

However, at present, the fiber-reinforced composite material sheet reinforcement method in the actual reinforcement project mainly adopts the passive reinforcement technology, which mainly has the following disadvantages: the high-strength fiber sheet as a reinforcement material can only be stressed when the reinforced structure is stressed twice , it can gradually play a role after further deformation occurs, so that the strength of the fiber sheet material cannot be fully exerted, and the overall reinforcement efficiency is low; in addition, for the existing damaged concrete structure, this kind of external fiber reinforced composite material sheet reinforcement technology cannot recover Existing damage, limited ability to improve deformation of original structure

Among them, the indirect method is usually not used in actual projects due to the small prestress provided; while the existing direct tensioning technology requires a specific device as a tensioning platform, which not only increases the difficulty of construction, but also improves construction cost

In addition, although a lot of research has been done on the reinforced structure of prestressed fiber reinforced composite materials at home and abroad, the problem of end anchorage is still not well solved, especially the end anchorage and prestressing are carried out step by step. Increase the workload of the reinforcement project

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