Carbon fiber reinforcement system that revives non-reinforced and cracked foundations beyond new construction.
This is a carbon fiber reinforcement system for existing concrete strip foundations that has obtained housing disaster prevention technology evaluation (evaluation number DPA-Housing Technology-23) from the Japan Architectural Disaster Prevention Association and has been registered as a utility model. By firmly adhering high-strength carbon fiber sheets to the foundation surface using matrix resin, it significantly improves shear strength, ductility, and seismic resistance. Unlike traditional underpinning methods that face many challenges in terms of weight, construction period, and cost, this system can reliably restore existing foundations with no reinforcement or deteriorated cracks to a robust supporting structure that far exceeds the original strength at the time of construction, without significantly changing the weight or cross-section of the structure.
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basic information
It is seamlessly composed of "seven robust layers," ranging from thunder-keren grinding to primer, putty, matrix resin (base coat and top coat), carbon fiber sheet application, and non-shrinking decorative mortar finishing. The strength performance has been verified through full-scale tests at the Tsukuba Architectural Testing Center, demonstrating a significant increase in bending and shear strength: approximately 2.0 times (42.9 kN) for single-sided application and approximately 3.8 times (80.2 kN) for double-sided application compared to unreinforced foundations (maximum load 21.2 kN). Additionally, by completely blocking external deterioration factors, it powerfully suppresses the carbonation of concrete and the corrosion of internal rebar over the long term, while also allowing for flexible adjustments to the number of layers to meet the required reinforcement amount.
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It is ideal for reinforcing cloth foundations with cracks and fissures, improving the seismic performance of unreinforced foundations, and enhancing the evaluation of seismic diagnostics. It is essential as a "footing stabilization" to ensure the seismic reinforcement effect of the upper structure (walls) functions at 100%, and it also demonstrates high effectiveness in enhancing the pull-out resistance of existing anchor bolts and retrofitted hold-down hardware. Since heavy machinery is not used, it can be constructed in densely populated areas and narrow spaces where noise suppression is required, completing the work in a short period of 3 to 5 days without affecting daily life. As a track record, it has been widely adopted for reinforcing single-family homes, retaining walls, buildings, apartments, and civil engineering structures across the country, including 124 buildings in Tokyo and 181 buildings in Kanagawa Prefecture.
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