東和産業 List of Products and Services

We will introduce the construction procedure for the tunnel water leakage countermeasure work and line drainage work B4 type. Mark the area to be constructed, ensuring that the defective joints and other issues are centered, and perform layout marking suitable for the size. Cut with a cutter according to the marked position (dust control measures are necessary). Chisel out the interior of the cut to standard dimensions and wash the cut and chiseled areas with water. Apply epoxy resin adhesive to both sides of the drainage rubber (filling material) or the cutter cut surface, compress the drainage rubber by 10 mm, and insert it into the drainage groove, ensuring that the protruding parts are smooth. Attach masking tape to both sides of the protruding part of the drainage rubber and the chiseled area, and apply epoxy resin primer. After confirming the drying of the primer, fill and finish with epoxy resin putty to ensure it is smooth with the structure, then remove the masking tape to complete the work. *For more details, please refer to the PDF document or feel free to contact us.

We would like to introduce the repair and reinforcement method "Carbon Fiber Sheet Repair and Fall Prevention Work" by Towa Sangyo Co., Ltd., which conducts waterproofing and repair work for concrete structures. 【Carbon Fiber Sheet Repair and Fall Prevention Work】 ■ Substrate Treatment Work 　↓ ■ Unevenness Adjustment Work 　↓ ■ Primer Application Work 　↓ ■ Resin Application Work* 　↓ ■ First Layer Attachment Work* 　↓ ■ Impregnation Material Application Work* (Repeat for 2 layers or more) 　↓ ■ Surface Painting Work 　↓ ■ Completion *For more details, please refer to the PDF document or feel free to contact us.

This is an introduction to construction examples using the "Three S Method" for tunnel water leakage countermeasures and line drainage works. We present construction carried out at various locations, including areas of significant water leakage and cold region leakage, along with photos taken before and after the work. 【Construction Examples】 ■ Areas of significant water leakage ■ Cold region leakage areas ■ Joint leakage areas ■ Crack leakage areas *For more details, please refer to the PDF document or feel free to contact us.

The Three S Method is a water leakage prevention measure for tunnels using elastic materials. It was selected as one of the eight methods for preventing water leakage at the junctions (horizontal joints) between the arch concrete and side wall concrete during the construction of the Seikan Tunnel. **Features** - It addresses leakage at joints and cracks, allowing for curved construction along the cracks. - It uses chloroprene-based independent foam rubber as the water guiding (filling) material, which can follow the expansion and contraction of the structure, eliminating re-leakage. - The rubber has a low thermal conductivity, which helps suppress freezing. - The surface is reinforced with epoxy resin, eliminating concerns about bulging or detachment due to back pressure, and reducing rubber degradation. - It finishes flush with the tunnel's inner space, not infringing on construction limits. - The standard types are available in four variations: 70, 100, 120, and 150, allowing for selection based on site conditions. - It is durable and economical. *Upon request, we provide responsible construction starting from investigation and design. Additionally, we can dispatch technicians (for investigation and construction) to address water leakage issues as needed.* *For more details, please download the catalog or feel free to contact us.*

Towa Sangyo Co., Ltd. is a company that sells and constructs materials for concrete repair and reinforcement, corrosion prevention, and waterproofing, including rapidly curing water-stopping seal cement, epoxy resin mortar "Super Crete," line drainage works (B4) [3S method], and carbon fiber reinforcement materials. We are confident that the adoption of the 3S method we developed in the Ministry of Land, Infrastructure, Transport and Tourism's "Civil Engineering Construction Estimation Standards" Chapter 13 Road Maintenance and Repair (8) Tunnel Leakage Countermeasure Work [B4] specification method is an evaluation of our technology. We also offer technical services such as Tougrid, Tousheet, and TO-RESIN. 【Business Activities】 ■ Waterproofing and repair work for concrete structures ■ Various waterproofing works for civil engineering and buildings (sheet waterproofing, etc.) ■ Maintenance and repair work for structures (tunnel, bridge repair, reinforcement, etc.) ■ Various waterproofing and anti-corrosion works and maintenance and repair works for water supply and sewage facilities ■ Manufacturing and sales of materials for tunnel leakage countermeasures and line drainage works B4 (3S method) ■ Manufacturing and sales of various waterproofing and water-stopping materials *For more details, please refer to the PDF materials or feel free to contact us.