Method for reinforcing concrete structure by using prestressed fiber cloth

Abstract

The invention discloses a method for reinforcing concrete structure by using prestressed fiber cloth. The fiber cloth anchorage and tension stressed region adopts a wedge structure which is opposite to the prestressing direction; the tensioning equipment using a simple structure with tension counterforce beams and tension rods has the advantages of simple structure, light weight and simple operation; and the anchorage and tension stressed region in the wedge structure enables the fiber cloth to be stressed uniformly in the process of tensioning and anchorage, and the fiber cloth can not be damaged when large tensioning force is applied, so that the fiber cloth reaches large longitudinal tensioning force without prestressing loss, thereby inhibiting the production and development of longitudinal cracks in concrete posts. The tensioning operation of the invention can do little damage to the original concrete structure, and thus, the invention can greatly save the construction cost, reduce the engineering risk and shorten the construction period, and has obvious technical and economic comprehensive benefits.

Description

technical field [0001] The invention belongs to the field of building structure engineering, in particular to a method for reinforcing concrete structures with prestressed fiber cloth. Background technique [0002] When the concrete column has longitudinal cracks due to insufficient bearing capacity or external effects such as temperature stress, it can be reinforced by pasting fiber cloth in the circumferential direction to restrain the development of longitudinal cracks and improve its bearing capacity and service life. [0003] Fiber cloth (especially carbon fiber) has excellent physical properties, good adhesion, durability and corrosion resistance, and has the advantages of high strength, small size, light weight, etc., and has been used to strengthen the tensile surface of concrete. Widely used, it has more advantages than other structural reinforced concrete structures. [0004] In the prior art, in order to take advantage of its high strength, carbon fiber cloth is ...

AI Technical Summary

Problems solved by technology

The construction equipment structure and construction technology of the fiber cloth longitudinal tensioning technology are too complicated, which increases the difficulty of construction and reduces the work efficiency, and because the fiber cloth requires a large tension force, it is difficult to obtain a large tension with the existing anchoring measures and tension equipment. Tension force, otherwise it will cause damage to the fiber cloth; at the same time, the existing tension equipment and anchoring measures will not uniformly stretch and anchor the fiber cloth, and it will easily cause prestress loss after anchoring, and the anchoring effect will be poor.

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