Long-length steel pipe injection mirror bolt "F-S Bolt"

Construction is possible with a hydraulic excavator for tunnels! We have a track record of approximately 40 meters as ultra-long mirror reinforcement.

The "F-S Bolt" is a long steel pipe injection mirror bolt that can be constructed at a low cost compared to non-steel materials. Since the steel pipe has slits, it can be easily cut and removed as the face advances, allowing for construction with a hydraulic tunnel boring machine. It has a high shear strength compared to other materials, providing tensile resistance against face collapse, as well as expected shear resistance. 【Features】 ■ Can be constructed at a low cost compared to non-steel materials ■ The slits in the steel pipe make cutting and removal easy as the face progresses ■ Being made of steel, it allows for easy separation from spoil during cutting and removal ■ Injection of polyurethane and cement-based materials is possible, and it can also be used as a drainage hole ■ By adjusting the presence of slits, it can also be constructed as a small-diameter long-length advance support *For more details, please refer to the PDF document or feel free to contact us.

Tunnel constructionOther civil engineering worksCivil Engineering Method