Construction method of prestress carbon fiber cloth reinforced reinforced-concrete square pillar

Abstract

The invention discloses a construction method of a prestress carbon fiber cloth reinforced reinforced-concrete square pillar. The method comprises the steps that a modularized reactive powder concrete (RPC) cushion block (an angle radian block, a common rectangular block and an anchor side rectangular block) is prefabricated, the surface of the cushion block is coated with an epoxy adhesive layer evenly so as to be smooth, and the pre-stress friction loss of carbon fiber-reinforced plastic (CFRP) cloth is reduced; the cloth is bonded to the surface of the reinforced reinforced-concrete (RC) square pillar so that arc angles can be formed; a self-locking anchor is embedded in a groove formed by the RPC cushion block and the surface of the reinforced RC square pillar, and the anchor is sealed with RPC after tension prestress is exerted; a transparent tape is bonded to the surface of the carbon fiber cloth before wrapping is carried out so that burrs at the edges are avoided; and after the carbon fiber cloth is tensioned, the surface of the carbon fiber cloth is coated with an epoxy adhesive layer, so that the overall bearing capacity is improved. According to the method, construction steps are clear, simple and practical, noise and a large amount of dust generated in the arc angle grinding process are avoided, the reinforced RC square pillar is prevented from being damaged by grinding, and rapid reinforcement of the RC square pillar through prestress FRP is achieved.

Description

Technical field [0001] The invention belongs to the technical field of structural reinforcement, and specifically relates to a construction method for reinforcing reinforced concrete square columns with prestressed carbon fiber cloth. This method uses self-locking anchors to prestress the carbon fiber cloth, so that the core part of the reinforced concrete square column (ie, the RC square column) is in a three-way compression state, thereby improving its bearing capacity and achieving a reinforcement effect. This method is suitable for general bridges and housing constructions, especially for large-scale public buildings (such as schools, shopping malls) for the reinforcement and reconstruction of reinforced concrete square columns that are mainly subjected to axial pressure. Background technique [0002] In recent years, the number of bridges and buildings that need to be reinforced has increased. For reinforced concrete columns, the traditional reinforcement methods include enl...

AI Technical Summary

Problems solved by technology

This method is aimed at using the self-locking anchorage to wrap the reinforced concrete square column with circumferential prestressed carbon fiber cloth, and manually grind the four corners of the square column to form arc angles. This process is time-consuming, laborious and noisy. , pollute the environment; and grinding will cause damage to the reinforced RC square column, the thickness of the protective layer of the steel bar is insufficient, and the steel bar leaks out

Images