ケー・エフ・シー List of Products and Services

The Gain CF Sheet Method is a technique that involves applying carbon fiber sheets treated with a high-impregnation adhesive to concrete structures for the repair and reinforcement of tunnels. It has passed tests for "flammability, self-extinguishing properties, and safety of generated gases," making it suitable for use inside tunnels. Additionally, the sheets are treated for high impregnation, which, when combined with a specialized adhesive, provides excellent adhesion performance. This helps to prevent sheet peeling during construction, ensuring safe installation. There are two types of sheets with different weaving patterns: the "CR" type, primarily used for falling debris prevention, which weaves carbon fibers in both vertical and horizontal directions, and the "UD" type, used for reinforcement, which aligns carbon fibers in one direction. With the addition of the new UD300, which has a weight of 300g/m², alongside the existing UD200 and CR200 (both with a weight of 200g/m²), the application range of the Gain CF Sheet Method has expanded.

The RBS formwork method is a cavity injection technique that uses polyurethane-based injection materials developed for the purpose of filling tunnel voids and reinforcing existing tunnels by filling the cavities behind the lining concrete. The high filling capacity and permeability due to the unique foaming of polyurethane resin allow for the filling of voids. Additionally, it penetrates cracks in the lining concrete, providing a water-stopping effect.

The SR method is a construction technique that involves injecting filling material into the voids behind the lining of existing tunnels or behind concrete structures, thereby integrating the ground and the structure. It excels in limited injectability that meets the required quality for the filling material in the back voids. 【Construction Procedure】 Air mortar is prepared by mixing a mortar made of a specified amount of cement, filling material, and water with foam generated by a foaming machine. This air mortar and the plasticizer "SRP-L" are each pumped and injected into the void while being mixed together at the injection point.

The "AGF-Me (Metal eco) method" is a patented method (Patent No. 3882118) for a non-widening long steel pipe advance construction technique. It features vertical slits in the terminal reinforcement steel pipes of the cutting section during tunnel excavation with non-widening support, allowing for the separate recovery of the steel pipes and injected materials during excavation. This method eliminates unnecessary mixed waste and enables resource utilization as sorted waste. 【Features】 ■ Patent No. 3882118 obtained ■ Structure allows for separate recovery of steel pipes and injected materials during excavation ■ Eliminates unnecessary mixed waste and enables resource utilization as sorted waste *For more details, please refer to the PDF document or feel free to contact us.

The "Me Method" is a small-diameter long steel pipe face reinforcement technique applied in weak ground conditions such as at the portal and in unconsolidated ground during mountain tunnel excavation. By enlarging the connection section, it enhances the strength of the threaded part, allowing for the use of small-diameter thin-walled steel pipes (φ76.3×4.2mm), which improves economic efficiency and workability due to weight reduction. Additionally, "Me-fix" aims to improve the adhesion strength, which has been a weakness of previous steel pipe face reinforcement methods, ensuring reliable ground confinement. 【Features】 ■ Recycling of steel materials through separate collection ■ Thinning of steel pipes through enlarged connection sections (socket method) ■ Improved adhesion strength of long steel pipe face reinforcement *For more details, please refer to the PDF materials or feel free to contact us.

The "Me fix type R" is a long steel pipe reinforcement method that aims to improve the adhesion strength, which has been a weakness of previous steel pipe reinforcement methods, and ensures reliable ground confinement. The "type R (RASEN concept)" features a helical grooved steel pipe that possesses adhesion strength equivalent to that of conventional grooved GFRP pipes. When using general steel pipes with a smooth surface, the number of pipes required may increase due to insufficient adhesion strength. However, this method can reduce the number of pipes used, making it economically advantageous. 【Features】 ■ Improvement of adhesion strength and assurance of propulsion performance ■ Strengthening of the threaded section and thinning of the steel pipe through a reduced diameter connection ■ Recycling of steel materials through separate collection ■ Use of small diameter thin-walled steel pipes (φ76.3×4.0, 4.2mm) is possible ■ Improved economy and workability due to weight reduction *For more details, please refer to the PDF document or feel free to contact us.

"Hybrid Fore-Piling" is a construction method that is expected to have a higher effect in suppressing the plasticization of surrounding ground. By placing small-diameter steel pipes from the upper part of the mirror section towards the top, it is possible to reinforce not only the "top part" that is reinforced by conventional fore-piling but also the "upper mirror ground" which has a high risk of collapse. [Features] - By increasing the overlap section, it can reinforce the surrounding ground over a wide area, including the mirror section. - Compared to conventional fore-piling, it has a higher effect in suppressing the plasticization of the ground. - By using small-diameter steel pipes (φ76.3), it is more economical than conventional methods. *For more details, please refer to the PDF materials or feel free to contact us.

■NETIS Registered, Registration Number: CG-140001-VR ■By applying the ShieM (Seam)-CS sheet, which is a laminated structure of a high barrier film and a lattice-like fiber sheet, it is possible to simultaneously implement "spalling prevention measures" and "deterioration prevention measures" for concrete. *NETIS Registration Number: CG-140001-VR *Meets the quality standards of NEXCO Tunnel Construction Management Guidelines 【Features】 ■Wetless Due to its four-layer structure, including a high barrier film, it has a "wetless structure" that prevents adhesive from permeating the sheet body or surface, allowing for immediate application of the topcoat after sheet adhesion, thus shortening the process. ■Handling While maintaining adequate strength, the sheet has been minimized in thickness to improve workability, making it easy to handle even for unskilled workers, thereby enhancing construction efficiency. Small-scale projects can be completed in one day. ■Excellent Workability By minimizing the thickness of the sheet while maintaining adequate strength, it can be applied even in sections including corners and edges. *For more details, please refer to the PDF document or feel free to contact us.

"Micro piles" are small-diameter cast-in-place piles and embedded piles with a diameter of approximately 100 to 300 mm. Steel pipes are pulled in while drilling into the ground to the specified depth, and if necessary, steel reinforcement materials such as rebar are inserted, followed by the injection of grout material to form the pile. Additionally, this product features a reliable coupler-type threaded joint that guarantees the strength of high-strength steel pipes and the overall strength of the pipes, along with a node projection that enhances adhesion performance with the grout material and an economical non-return valve. [Features] ■ Manufactured using electric resistance welding, resulting in extremely good dimensional accuracy. * Depending on design conditions, the application of general structural carbon steel pipes (STK) is also possible. ■ Equipped with an economical and high-performance non-return valve, ensuring reliable grouting. ■ A selection of efficient construction menus tailored to the geological conditions of the site is available. * For more details, please refer to the PDF document or feel free to contact us.

The "GPR method" is a groundbreaking repair technique that applies the technology of steel pipe expansion-type lock bolts to repair the corroded parts of guardrail posts. It features simple work that does not require exploratory digging and does not need special construction techniques. Additionally, the construction equipment is compact, and the work time per location is extremely high at just 10 to 20 minutes. [Features] ■ Adoption of highly corrosion-resistant coated materials ■ Easy construction that does not require special construction techniques ■ Instant repair from the inside of the post using expansion steel pipes ■ Speedy construction ■ No exploratory digging required *For more details, please refer to the PDF materials or feel free to contact us.

The "Steel Plate Bonding Method for Lining Repair" is a technique that allows for the economical and precise repair of aging tunnel lining concrete. By connecting steel strips of a specified length on-site using splice plates, anchoring them along the inner surface of the lining, injecting, and maintaining the lining with the rigidity of the steel, the required repair effect can be achieved simply by adjusting the installation pitch P1 and P2 of the steel strips. This compact construction method can be applied in various locations and allows for work to be carried out while the tunnel remains in service. 【Features】 ■ Maintains lining with the rigidity of steel ■ Achieves the required repair effect simply by adjusting the installation pitch of the steel strips ■ Compact construction that is not location-dependent ■ Can be performed while the tunnel remains in service ■ Manual construction is possible from transport to execution, eliminating the need for construction machinery *For more details, please refer to the PDF document or feel free to contact us.

The "RMA Method" is a shear reinforcement method that allows for reinforcement without encroaching on the inner cross-section of continuous walls. It employs capsules containing premixed mortar as a bonding agent. This method enables construction using impact on long or thick reinforcement bars, making it a post-construction technique. Since there is no need for mortar mixing or the installation of injection holes on-site, special management is unnecessary. Reinforcement is carried out only for the insufficient shear strength, allowing for a transition from shear failure to bending failure. 【Features】 ■ Drilling can be done with a small diameter and only once ■ No mixing on-site, maintaining consistent quality ■ Simple product composition and construction method, reducing construction time ■ Minimal interference with existing structural reinforcement, allowing for reduced re-drilling ■ A method that does not use large or specialized machinery, saving space *For more details, please refer to the PDF document or feel free to contact us.

■NETIS Registered Registration Number: KK-240031 The "Gainamesh Method Type D" is a construction method that prevents water leakage and spalling from concrete structures. This method aims to prevent dripping of water leakage and spalling of concrete pieces in concrete structures, ensuring the safety of users of the structure. The rigidity of the shape-retaining band allows for easy installation on the curved surfaces of tunnels. Installation is quick as it only requires driving in anchors. 【Features】 ■ Effectively prevents water leakage and spalling from concrete structures ■ Easy to install, allowing for quick construction ■ Weather-resistant and alkali-resistant ■ Excellent durability with stainless steel anchors ■ Easy to remove and install, facilitating maintenance 【NETIS Number】 KK-240031 *For more details, please refer to the PDF document or feel free to contact us.

The "TX Sheet Method" uses a rigid polyethylene sheet (TX sheet) to cover areas of water leakage in the lining concrete, allowing for linear or surface drainage. Due to its thickness of 4mm, including ribs, it can be installed without affecting tunnel accessories. Additionally, the rib effect on the back of the sheet forms a drainage layer, providing excellent drainage functionality. It allows for anchoring over non-anchored materials, offering excellent workability, and can be installed across differences in elevation such as corners and edges depending on the shape of the tunnel. 【Features】 ■ Excellent drainage effect The rib effect on the back of the sheet forms a drainage layer, resulting in superior drainage functionality. ■ No aging degradation The sheet is highly resistant to chemicals, unaffected by acids, alkalis, or organic solvents, and has good weather resistance with no aging changes. ■ Installation possible after investigation and repair Depending on the deformation of the tunnel, the TX sheet method can be applied after investigation and reinforcement. ■ Excellent workability and cost-effective Using Hawk or KB anchors allows for anchoring over the secured materials, making it a highly workable and economical method.

■NETIS Registered, Registration Number: KK-240048 ■High-strength aramid fibers reliably prevent the spalling of concrete fragments. This construction method aims to prevent the spalling of concrete fragments in concrete structures using a GFRP shape-retaining body and a mesh of high-strength aramid fibers, ensuring the safety of users of the structure. *This meets the quality standards compatible with NEXCO tunnel construction management guidelines. 【Features】 The mesh part allows for visual inspection after installation. By using high-strength aramid, there is less alkali deterioration due to groundwater, and it does not conduct electricity, making it suitable for installation in railway-related tunnels. Installation is quick and easy, requiring only the driving of strike anchors. Additionally, if any deformation is observed after installation, maintenance such as removing and reattaching the fixing screws can be easily performed. By using a lock nut with a friction ring (leaf spring), it provides a function to prevent loosening, enhancing safety. This lock nut has passed NAS standards, which are specified as verification items during material approval by NEXCO.

■NETIS Number: KT-230046 Technology Name: Fiber Sheet Adhesive Method for Tunnel and Bridge Repair and Reinforcement "Gaina SH Sheet Board Method" * Reinforcement with a single-layer laminated fiber sheet using high-density carbon fiber (compared to standard multi-layer). * Compared to our carbon fiber sheet method of overlapping application, this method is expected to shorten construction time and reduce costs. * Lighter than our steel plate adhesive method. No anchor work is required due to adhesive application. This method involves fewer processes compared to our continuous fiber sheet method. * High strength allows for strip-like arrangement. Unfinished areas between strips can be visualized, enabling visual confirmation of crack progression after reinforcement. * High-performance impregnation agents ensure reliable impregnation, allowing for high-quality construction. * No special skills are required for adhesive and impregnation work, making it easy to secure construction personnel. * As a fiber sheet adhesive method, partial construction and partial adhesion are possible. It is flexible, allowing for easy application in corners.

- Adhesion strength: It can achieve a tensile force exceeding the yield strength of the anchor bar with an effective length of 7 d.a. - Hardening performance: It hardens in 24 hours due to the use of special cement. - Workability: Being in a capsule type, simply immersing it in water ensures a constant water ratio, making the mixing process smooth. - Constructability: Due to its high viscosity, there is minimal sagging of the injected mortar during horizontal and upward construction. - Corrosion resistance: The entire surface of the anchor bar is covered with anchor fixing material (mortar), providing excellent corrosion resistance. - Safety: As it primarily consists of cement mortar, it is non-combustible and does not contain harmful substances.

■NETIS Registration Number: KT-230095-A 【Features】 ■Strong Adhesive Power With a thickness of 300μm in the adhesive layer, it penetrates into concrete due to anchoring effect. ■Visible Inspection of the Lining Surface The lining can be visually inspected through slits provided in the sheet, no equipment like a microscope is needed. ■Easy Installation, Just Peel and Stick No adhesive application process is necessary; simply peel off the release film and stick it on. Repairs can be made with just the sheet and a cutter. ■Easy Cleaning with High-Pressure Washer The interior has excellent cleaning recovery properties, allowing surface dirt to be removed with a standard household high-pressure washer. 【Value Provided by Gainatunnel Interior Sheet】 Unlike traditional interior work, inspections for tile lifting, corrosion of fittings, and loosening of bolts are unnecessary.

The "Rock Bolt Reinforcement Method" is a reinforcement method for existing tunnels based on the geological conditions of the surrounding ground. - It involves inserting steel materials deeper based on the slip surface of the soil mass, securing the entire steel structure with grout, and passively generating tensile forces in the steel as the ground deforms, thereby suppressing ground deformation and the occurrence of slips. - This method effectively and economically reinforces the tunnel lining with rock bolt anchoring, especially in sandy and gravelly ground where conventional rock bolt installation has struggled to achieve anchoring strength. 【Features】 ■ Saber EX: A high-pressure water expansion type rock bolt for reinforcement that does not require an anchoring agent. This allows for simultaneous anchoring during installation, reducing the cycle time per bolt and enabling immediate strength development. - The bolts are treated with a high corrosion-resistant coating, contributing to the longevity of the tunnel and ensuring reliable ground retention effects. ■ IBO ZAM: A self-drilling rock bolt that can perform drilling and bolt insertion simultaneously, shortening the cycle time per bolt. - It features an R32 thread rolled along its entire length, making it very easy to handle on-site. It is effective not only as a self-drilling bolt but also as an injection bolt utilizing its hollow structure. *For more details, please refer to the PDF document or feel free to contact us.

■High-rigidity tunnel back drainage material born from TX sheet 【Features】 ● With sufficient compressive strength, it is expected to provide protection for the heads of rock bolts. ● The ribs processed throughout the sheet enhance water collection capacity and create drainage spaces with the ribs, efficiently guiding inflow. ● The rib shape in a triangular profile suppresses crushing due to concrete placement pressure, maintaining drainage capability even after concrete is poured. ● It can be nailed with concrete nails (no need for a pressure plate; it does not penetrate) and the ends have a double-sided wave shape, providing an anti-slip effect during installation. * Registered in the NETIS (New Technology Information System) of the Ministry of Land, Infrastructure, Transport and Tourism (KT-180093-A) * For more details, please refer to the PDF materials or feel free to contact us.

To prevent excessive impact on the manhole's lower chamber during construction, damage and cracks are unlikely to occur, and stable strength is ensured through the use of resin. - Due to the screw-in design, excessive impact on the manhole's lower chamber does not occur. - Stable tensile strength is ensured by combining it with resin fixation. - The screw-in design allows it to be secured by friction, enabling progression to the next step even before the resin hardens. - This product complies with the G4 standard of the Japan Sewage Works Association. *NETIS (New Technology Information System): Registration Number CB-240010-A*