Lock bolts for NATM construction method

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last updated：May 25, 2021

フジモリ産業

Design and selection according to ground conditions is possible! Introducing rock bolts used in the NATM method.

This product is a rock bolt used in the NATM method, which is widely adopted for tunnel construction. We offer a variety of options, including the "UN Bolt [180kN capacity twist]," "deformed bar rock bolts," and "high-strength rock bolts [297kN capacity]," allowing for the selection of rock bolts according to design and ground conditions. Additionally, we provide "UN Mortar," which excels in adhesion and early strength, for rock bolt anchoring. 【Product Lineup】 ■ UN Bolt [180kN capacity twist] ■ Deformed bar rock bolts ■ High-strength rock bolts [297kN capacity] ■ UND self-drilling rock bolts ■ Rock bolt head protection material (rock bolt cap) *For more details, please refer to the PDF materials or feel free to contact us.

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basic information

【UND Self-Drilling Lock Bolt Features】 ■ Suitable for ground that does not support its own walls (gravel mixed soil, strongly weathered rock, etc.) ■ The drilling rod can be used directly as a lock bolt, eliminating the need to retrieve the rod and improving work efficiency. ■ The hollow design of the drilling rod allows for grout injection, ensuring that the entire length of the bolt can be grouted reliably. ■ Easy injection of various anchoring materials such as cement-based and polyurethane-based materials. *For more details, please refer to the PDF document or feel free to contact us.