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The "Set Form Method" is a technique used in the repair work of existing tunnels, where voids behind the lining concrete are filled with rigid polyurethane foam. Rigid polyurethane foam hardens in about one minute after injection and reaches its final strength in 30 minutes, providing excellent early stability. Additionally, if using rigid polyurethane foam that expands 40 times, the amount of materials transported and the injection volume are only one-fortieth of the actual void volume. 【Features】 - Minimal penetration and escape into the surrounding ground, reducing the injection volume - Construction possible within a budget based on actual void volume - The weight on the lining concrete is lightweight at 30 kg/m3 - Excellent water-stopping effect as it expands and hardens even underwater - Can be constructed without time constraints, among others *For more details, please feel free to contact us.

• Renovation and repair methods