[Construction Case] Filling Work for Void Under Concrete Pavement Slabs of Kanmon Tunnel

basic information

■ The Upcon Method [Concrete Pavement Slab Settlement Correction Method] In the case of concrete pavement slabs that have experienced settlement, step differences, tilting, or voids, small holes with a diameter of 16mm are drilled, and polyurethane resin is injected while continuously monitoring the level in millimeter increments. The resin injected beneath the slab compresses and strengthens the ground with pressure that causes it to foam in a short time, improving the bearing capacity and correcting the concrete by pushing it upward. The required strength of the resin manifests in about 120 minutes. Additionally, if voids occur beneath the slab, they can be filled using the same method. ■ Features of the Upcon Method 1. Short construction time: The required strength is achieved approximately two hours after the injection of polyurethane resin, allowing for early reopening to traffic. 2. Settlement correction of footings and pillow blocks can be performed without excavation. 3. Improvement of looseness in the subgrade. 4. Responsive with mobile plant vehicles. We provide total support for on-site surveys, repair planning, and construction, all handled responsibly by our in-house staff. Our specialized and experienced staff, trained in the field, will propose the optimal repair plan tailored to your site.

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Applications/Examples of results

Concrete pavement slab void filling work