| 摘要 |
PROBLEM TO BE SOLVED: To provide a high strength and high quality anchor assembly having a large diameter lock bolt as a core material with a high drilling speed, surely disposed near the center of cross section of the anchor assembly. SOLUTION: In this large diameter lock bolt anchor assembly, the core material 2 having a drilling inner bit 4 at a tip is pre-arranged in a casing rod 1 having a drilling outer bit 3 at a tip, and the inner bit is connected to the outer bit in the state of the tip of the inner bit 4 slightly projected from the outer bit 3 so as to form a double bit 5. A double bit disconnection device 8 and a core material positioning device 10 are disposed in the core material 2, grout material G is filled into a drilled hole H through a filling hose 6. When the casing rod 1 is extracted, the double bit 5 is separated, and the inner bit 4 and the core material 2 are left in the drilled hole. COPYRIGHT: (C)2003,JPO
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