| 摘要 |
PROBLEM TO BE SOLVED: To provide an extension steel pipe for a driven steel pipe for reinforcing natural ground, which stabilizes the natural ground by being driven into surrounding loose ground from inside a tunnel, which is formed as a long steel pipe depending on a driving depth by connecting and adding the several extension steel pipes, and which enables water pipes arranged inside to be automatically and surely connected together concurrently with addition. SOLUTION: In the driven steel pipe for reinforcing the natural ground, a rearmost-side steel pipe is connected to a leading-side steel pipe, wherein a drilling bit is fixed to a front end, via the extension addition steel pipe. The water pipe, which is connected to the front and back ends of the extension pipe by means of the front-side and rear-side steel pipes and a screw joint and which is arranged in the central part in each steel pipe, can be connected to the back end of the water pipe in the front-side steel pipe by means of a faucet joint capable of rotating and longitudinally moving the front end of the water pipe in the rear-side steel pipe. Thus, concurrently with the connection of the steel pipes by the screwing of a screw joint, the water pipes are connected together without the need for manpower. COPYRIGHT: (C)2006,JPO&NCIPI
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