Project Overview

Project name: Carbon fiber sheet reinforcement project for a comprehensive building

Construction site: Chengdu

The construction period of this sub-item: 30 calendar days, that is, the construction period is from November to December 2008

Finished paste project: about 200 square meters

Affected by the devastating earthquake in Wenchuan, Sichuan, some beams and slabs of the complex had structural cracks. After appraisal and reinforcement design by scientific research institutions, a plan for structural reinforcement with carbon fiber sheets was determined.

Construction situation

According to the structural design reinforcement drawings, special construction plans are prepared and detailed technical explanations are carried out. During construction, the construction process and operation points determined by this construction method are strictly implemented one by one. In particular, the process of grinding old concrete and the deployment of structural adhesives are strictly controlled. Make the carbon fiber sheet and the concrete base layer adhere firmly (the adhesive layer is not damaged by the test) and jointly bear the force. Finally, the cement mortar is used to seal and protect and paint the emulsion paint to achieve the effect of not affecting the appearance.

Application effect

Through the carbon fiber sheet sticking and strengthening treatment, the original appearance and function of the building are basically not affected and the structure is strengthened. The complex building can be restored to normal operation in a relatively short period of time, and good social and economic benefits have been achieved.

Construction characteristics of carbon fiber sheet

(1) In use, the carbon fiber sheet has excellent tensile strength and elastic modulus.

(2) In the construction period, the construction of carbon fiber sheets is convenient, the construction process is simple, and the construction efficiency is high. It does not require large machinery and tools, and can be completed with only a small amount of labor.

(3) In terms of construction quality, carbon fiber is light in weight, basically does not increase the weight of the original structure and affect the appearance of the structure, and the construction quality is easy to guarantee.

(4) In terms of construction safety and environmental protection, there is no wet work, carbon fiber sheet construction takes up less space and no live work.

Carbon fiber sheet construction process principle

(1) When using pasted carbon fiber sheets to reinforce concrete, the carbon fiber sheets should be pasted on the surface of the structure through a matching modified epoxy resin adhesive, so that the carbon fiber sheets can bear the tensile force, and coordinate with the original concrete deformation and share the force.

(2) Before using pasted carbon fiber sheets to reinforce concrete, it should be designed by a professional designer, approved by the original design unit, and completed by a professional construction team.

(3) Carbon fiber sheets can be used to reinforce concrete structural members in the following ways.

① Paste carbon fiber sheets in the tension area of beams and plates for bending reinforcement, and the fiber direction should be consistent with the tension direction of the reinforced part.

②Use ring hoops or u-shaped hoops to strengthen beams and columns under shear, and the fiber direction should be perpendicular to the axial direction of the members.

③The column shall be strengthened for earthquake resistance with hoop-bundle pasting, and the fiber direction shall be perpendicular to the column axis. .