Existing Tunnel Reinforcement Method Using CFRP Strip Adhesive - Achieving Effective Tunnel Interior Reinforcement with High-Strength CFRP Using Carbon Fiber Sheets and Separators.
■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.
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basic information
In the CFRP method, carbon fiber is sewn with a separator, fixed to concrete with adhesive, and then impregnated to create FRP, allowing for strip placement due to increased strength, resulting in a high reinforcement effect. *Improved Workability By applying the adhesive and impregnating agent in separate processes, it is not dependent on the skill level of the workers. Additionally, because it is a lightweight and flexible material, workability is improved compared to our steel plate bonding method. *Realization of Strip Placement through Increased Strength Compared to our CFRP method, the weight can be increased up to 2,400g/m2, ensuring strength comparable to full bonding even with strip placement. Strip placement allows for monitoring of crack progression after reinforcement. *Expectations for Reduced Construction Time and Cost Savings.
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Applications/Examples of results
Reinforcement of tunnels, bridges, box culverts, etc. - Suitable for arch-shaped structures and upward construction - Suitable for wrapping reinforcement of columnar structures
Detailed information
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Examples of tunnel interior reinforcement
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There is no need to remove the existing drainage pipe for the full application of two layers of carbon fiber.
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There is no need to relocate the lighting fixtures for the full application of two layers of carbon fiber.
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Tunnel - Shear and bending reinforcement of deteriorated concrete. It is flexible, allowing for reinforcement of arch-shaped structures. It can be installed in a strip configuration, and after installation, uninstalled areas between the strips can be visually inspected.
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Bridge reinforcement - pier reinforcement, existing deck, and girder reinforcement. Flexible, allowing application to curved and corner areas. Wrap-around reinforcement is also possible.
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Box culvert reinforcement can also be applied to bends and corners.
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The adhesive and the impregnation agent can be treated as separate processes, allowing for the use of an impregnation agent with excellent impregnation properties.
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Sheet lamination structure
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Reinforcement work of box culverts on the highway.
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Company information
As a pioneer in post-installed anchors in Japan, KFC was established in 1965. We respond to customer needs with a consistent system from product development to sales and construction. Our business activities are centered around three main areas: construction fastening materials such as post-installed anchors, materials for tunnel excavation like rock bolts and auxiliary methods, and various construction works related to seismic reinforcement, safety measures, equipment, and refreshment.