[Construction Case] Filling Work for Void Under Concrete Pavement Slabs of Kanmon Tunnel
Fiscal Year 2013 Shimonoseki Area Preservation Work (Kanmon Tunnel Concrete Pavement Slab Void Filling Work)
The Kanmon Tunnel connecting Fukuoka Prefecture and Yamaguchi Prefecture. When large vehicles pass through the toll booth near the tunnel entrance and exit, vibrations were occurring in the nearby residential area. An investigation conducted by FWD revealed the presence of voids believed to be the cause of the vibrations directly beneath the concrete pavement slabs. The Upcon method is a technique that involves injecting rigid polyurethane resin beneath the concrete pavement slabs. The filling and compaction effects of the polyurethane can resolve the loosening and voids in the subgrade that cause vibrations. The Upcon method was adopted with the aim of suppressing slab vibrations by improving the environment of the upper subgrade. 【Site Information】 Fukuoka Prefecture - Yamaguchi Prefecture / Kanmon Tunnel Total construction area: Approximately 200 square meters Construction period: 2 nights
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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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Concrete pavement slab void filling work
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We carry out construction to correct the sinking, tilting, steps, and gaps in concrete floors caused by uneven ground subsidence in buildings such as factories, warehouses, stores, and general residences, using our unique "Upcon Method" with completely non-fluorinated urethane resin and small machinery. Additionally, we are engaged in public works that utilize technologies developed through various research and development projects to restore the functionality of aging social infrastructure such as roads, airports, ports, and agricultural waterways. ■ Features of the Upcon Method 1. Short construction period: The construction time is 1/10 of conventional methods. 2. No interruption of operations: No need to move machinery or cargo. 3. Comprehensive high technical capability: 100% in-house employees. 4. Compact construction system: Quick restoration to the current state is possible. 5. Reduced risk of re-subsidence: Lower risk of re-subsidence compared to conventional methods. Our in-house staff provides total support from on-site surveys across the country to repair planning and construction, taking full responsibility. Our specialized and experienced in-house staff will propose the optimal repair plan tailored to your site. Upcon Co., Ltd. was newly listed on the Nagoya Stock Exchange Next Market on December 26, 2022.