It also accommodates ground where the wall cannot stand on its own. The use of small machinery improves workability and cost-effectiveness. A self-drilling rock bolt method that enables high-speed and labor-saving construction.
The 'SP Soil Nail' handled by JFE Shoji Tail One Corporation is a self-drilling permanent rock bolt method developed by its group company, ST Engineering Co., Ltd., which is suitable for ground where the borehole walls do not stand independently. It can be constructed using general-purpose machinery such as small boring machines and backhoe drills, and depending on site conditions, construction can be carried out while minimizing scaffolding.
By adopting a unique "partial double-tube method" and "two-directional pressure injection," it achieves improved workability and stable anchoring performance. Compared to conventional double-tube drilling methods, it is expected to reduce labor, shorten construction periods, and lower costs.
Additionally, it accommodates a wide range of ground conditions from sandy soils to weathered rock and soft rock. It is utilized in various sites for slope reinforcement and slope disaster prevention measures.
Furthermore, with the revision of NEXCO's "Cutting Soil Reinforcement Construction Method Design and Construction Guidelines" in July of the 6th year of Reiwa, the approach to applying self-drilling types to permanent installations has been reconsidered. It is anticipated that there will be further opportunities for comparison and examination of the SP Soil Nail method as an option for permanent reinforcement in ground where the borehole walls do not stand independently.
