Self-drilling bolt system used in conjunction with casing pipes. Achieves reliable grout filling. A lightweight and compact system suitable for construction in narrow spaces.
◎This is a self-drilling "high corrosion-resistant hollow bolt" for the main specification. It is a casing and spacer combined type. The use of a self-drilling method with casing pipes improves construction quality. It is also possible to use lightweight drilling machines or manual labor (leg hammers), making it suitable for construction in narrow areas. Features: - A self-drilling main bolt system using "high corrosion-resistant hollow bolts" combined with casing. - Construction is possible with lightweight drilling machines or manually. - Ensures reliable grout filling. - Effective for construction in narrow spaces. The "Hawk Nailing" is a self-drilling bolt system that uses high corrosion-resistant plated hollow rock bolts (with a diameter of 32) combined with casing pipes. It enables reliable grout filling, which has been a challenge in previous self-drilling methods. Additionally, it allows for construction using compact drilling machines or manual labor (leg hammers), making it feasible for construction in narrow spaces where large machinery cannot access.
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basic information
○ Rock Bolt Specifications (High Corrosion-Resistant ZAM* Coating Specification) Designation: R32 Cross-sectional Area (mm²): 432 (386) *The cross-sectional area in parentheses considers a corrosion allowance of 1mm Yield Load (kN): 200 Yield Point (N/mm²): 463 Tensile Load (kN): 230 Tensile Strength (N/mm²): 533 Weight (kg/m): 3.4 *"ZAM" is a registered trademark of Nippon Steel Corporation. "ZAM" is the product name for the hot-dip galvanized steel sheet made from a zinc-aluminum-magnesium alloy developed by Nippon Steel Corporation. ■ Drilling Method Air or other supplies are provided from the swivel set on the rock bolt to drill to the specified depth. The drill cuttings are discharged through the gap between the casing pipe and the hole wall. (Reverse circulation drilling) ■ Injection Method Cement milk is filled and injected through the casing pipe with the injection head attached. After confirming no leaks, supplementary injection is performed while recovering the remaining casing pipe. ■ Pipe Removal Method (Manual) Manual pipe removal work is possible. The tool used for pipe removal is divided into a wedge part and a striking part (weight). After inserting the striking part into the casing pipe, the wedge part is set, and the striking part is lifted upward while removing the pipe.
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Applications/Examples of results
- Reinforced soil work using rebar insertion for cut slope reinforcement (rock bolts) * NETIS registration number: HK-240018-A * Registered in the cut slope reinforcement soil work calculation system "Reinforced Soil" Version 15 by Godai Development Co., Ltd.
Detailed information
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Air and other supplies are provided from the swivel set on the rock bolt, and drilling is carried out to the specified depth. The drill cuttings are discharged through the gap between the casing pipe and the hole wall. (This is known as reverse circulation drilling.)
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Cement milk is filled and injected through the casing pipe with the injection head attached. After confirming there are no leaks, supplementary injection is performed while retrieving the remaining casing pipe.
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This system allows for manual extraction work. The tool used for extraction is divided into a wedge part and a striking part (weight). After inserting the striking part into the casing pipe, the wedge part is set, and extraction is performed by striking the striking part upward.
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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.
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