| 摘要 |
PROBLEM TO BE SOLVED: To provide a device capable of improving the ground under an existing structure which cannot be improved by linear boring. SOLUTION: A pipe rod is composed of a transmission rod 2 connected in the longitudinal direction and a cylindrical front end rod installed on the tip of the transmission rod 2. After recovering a boring advancing head and a positional information transmitter slidingly stored in the front end rod, a high pressure injection cylinder is inserted into a cavity of its recovery trace. A hardening agent is injected into the ground under high pressure via the high pressure injection cylinder. COPYRIGHT: (C)2008,JPO&INPIT
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