Hongshengsha wharf of Guangzhou port reinforcement and repair

Overview

The pile caps of the Hongshengsha Wharf of Guangzhou Port have been submerged under water for many years, and seawater has entered the interior of the concrete. The treatment on the surface layer will leak from the inside to the outside, which will affect the quality of the carbon fiber cloth. For pile caps in this situation. In the construction, the concrete in the water seepage part is cut out and then repaired with quick-drying cement, and then cracks are grouted after repair. After the interface treatment, bonding the carbon fiber fabric.

Construction technology of crack grouting

The grouting should form a closed cavity with cracks, reserved for entrance and exit under control. With the help of a special grouting pump, the gap of the hydraulic fluid is filled and filled. After grouting, wait for the glue to solidify, then pull out the grouting nozzle, grind it flat, and then use the special adhesive for underwater operation as the interface treatment.

Finally externally bonded the carbon fiber fabric.

Carbon fiber fabric bonding reinforcement

Technical index of carbon fiber cloth: Unidirectional fiber cloth, tensile strength 4900MPa, elastic modulus 2.30x10⁵MPa, elongation at break 1.7%, unit mass 1.8g / m, thickness 0.167mm, width 300mm. Its characteristics are: high strength, high efficiency, wide application range, and easy quality assurance. The construction is convenient, the work efficiency is high, there is no wet operation, no on-site fixed facilities are needed, and the construction occupies less space. Excellent corrosion resistance and durability. After reinforcement and repair, the weight of the original structure and the size of the original components are basically not increased.

Technological process of pasting carbon fiber cloth: surface treatment of components, painting primer, repairing and leveling, pasting fiber composite materials, curing and curing, quality inspection, protective treatment, completion

Conclusion

In this project, the reinforcement of 17 fork pile caps with single-layer carbon fiber cloth and the reinforcement of 7 fork pile caps with double-layer carbon fiber cloth have been completed. And according to the carbon fiber cloth positive tensile strength inspection program of Guangzhou Harbour Engineering Quality Inspection Center, under similar construction environment. Six concrete test specimens for positive bonding strength test were made, and the detected positive bonding strength reached the design requirements. After inspection and acceptance by the supervising engineer and the owner ’s agent, the quality of the carbon fiber reinforced fabric meets the design requirements and specifications.