Method for strengthening concrete column by pre-stressed fiber cloth

Abstract

The invention discloses a method for strengthening a concrete column by pre-stressed fiber cloth, using a tensioning device with a connecting-rod structure, which is capable of rapidly carrying out tensioning movement, and having the advantages of simple and convenient operation and high work efficiency. More particularly, the fiber cloth can obtain high enough tension and correspondingly, the concrete column can obtain high enough radial compressive pre-stress by applying smaller transverse tension, thereby achieving the purposes of strengthening the concrete column and preventing surface longitudinal cracks from being generated and expanded and reducing the requirements for the tensioning device and process. The tensioning device of the invention has the advantages that the stress of the fiber cloth is uniform and the tensioning effect is good during the tensioning process, and the damage of the tensioning operation to the original concrete structure is low; and the invention can greatly save the construction cost, reduce the construction risk and reduce the construction period. Therefore, the invention is of significant benefits to technology and economics in an overall manner.

Description

technical field [0001] The invention belongs to the field of building structure engineering, in particular to a method for reinforcing concrete columns 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 usu...

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, reduces work efficiency, and is difficult to obtain and requires a large tension.

At the same time, the existing anchoring method is easy to cause the loss of prestress, and the anchoring effect is poor.

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