Construction Method of Reinforced Concrete Column Strengthened by Prestressed Carbon Fiber Sheet

Abstract

The invention discloses a construction method for reinforcing reinforced concrete columns with prestressed carbon fiber cloth. The concrete column to be strengthened shall be chamfered, surface polished, hole filled, etc., and the surface of the pre-designed reinforcement shall be coated with epoxy. After curing, it can reduce the friction between the carbon fiber cloth and the concrete surface, and can effectively transmit Prestressing; at the same time, in order to prevent the edge of the carbon fiber cloth from detaching before wrapping, it is necessary to paste transparent tape on the surface of the carbon fiber cloth; tighten it through the self-locking anchor clamp, and then wrap it on the wrapped concrete column, twist it with a wrench Tighten the screw to apply prestress; after reaching the predetermined prestress degree, apply a layer of epoxy glue on the surface of the carbon fiber cloth. This step can prevent the carbon fiber cloth from "breaking and fluffing" phenomenon of individual tows and ensure its overall force . The invention has a novel concept, clear, simple and practical construction steps, fully exerts the high-strength effect of the carbon fiber cloth, thereby improving the reinforcement effect as a whole, and is convenient for popularization and application.

Description

technical field [0001] The invention belongs to the field of structure reinforcement, in particular to a construction method for reinforcing reinforced concrete columns with prestressed carbon fiber cloth. This method is applicable to general housing construction, especially to reinforcement and reconstruction projects of reinforced concrete columns mainly subjected to axial pressure in large public buildings (such as schools and shopping malls). Background technique [0002] In recent years, more and more buildings need to be reinforced. For reinforced concrete columns, the traditional reinforcement methods include enlarging the section method, bonding steel reinforcement method and bonding carbon fiber cloth reinforcement method, among which the carbon fiber cloth reinforcement method is based on its construction The advantages of convenience and no increase in building weight have been widely used in recent years, but problems follow after use. First of all, a large numb...

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Problems solved by technology

However, this reinforcement method will also encounter some problems in the implementation process. First, the concrete surface is not very smooth after grinding, and the friction resistance between it and carbon fiber cloth will affect the transmission of prestress, thereby affecting its reinforcement effect; secondly, carbon fiber cloth is a single When the prestress is applied to the filamentary braid through the self-locking anchor, due to the uneven force, the individual tows on the surface of the carbon fiber cloth are broken, and the surface "fluffing" occurs, thereby reducing the overall mechanical performance of the carbon fiber cloth. , affecting the improvement of the bearing capacity of the reinforced member

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