Existing Tunnel Reinforcement Method Using "CFRP" Bonded Plates - 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 conventional multi-layer). * Compared to our carbon fiber sheet method of overlapping, 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. Fewer processes are needed compared to our continuous fiber sheet method. * High strength allows for strip placement. 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 specialized skills are required for application 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 arrangements due to increased strength, resulting in high reinforcement effectiveness. *Improved Workability By applying the adhesive and impregnating agent in separate processes, it is not dependent on the skill level of the workers. Additionally, due to its lightweight and flexible nature, workability is improved compared to our steel plate bonding methods. *Realization of Strip Arrangement through Increased Strength Compared to our CFRP method, a weight of up to 2,400g/m2 is possible, ensuring strength comparable to full surface bonding even with strip arrangements. The strip arrangement allows for monitoring the progression of cracks 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 - Applicable 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 two-layer carbon fiber application.
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Tunnel - Shear and bending reinforcement for 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. It is flexible, allowing for application to curved and corner areas. Wrap-around reinforcement is also possible.
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Box culvert reinforcement Can be applied to bends and corners as well.
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The adhesive and the impregnation agent are treated as separate tasks, allowing the use of an impregnation agent with excellent impregnation properties.
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Sheet lamination structure
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Condition of the highway and box culvert reinforcement work.
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Company information
As a pioneer in post-installed anchors in Japan, KFC was founded in 1965. We respond to customer needs with a consistent system from product development to sales and construction. Our business activities focus on three main areas: construction fastening materials such as post-installed anchors, materials for tunnel excavation like rock bolts and auxiliary methods, and various construction projects related to seismic reinforcement, safety measures, equipment, and refreshment.
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