| 摘要 |
PROBLEM TO BE SOLVED: To provide a system and a method for drilling the ground, which enables drilling work on the ground while not discharging pressurized water to prevent the drop of accumulated water pressure, spilling of muddy water, drying of wells, and other negative affects on animals and plants. SOLUTION: The system 1 is for drilling the ground containing the pressurized water. The system comprises a drilling section 3, which drills the ground while discharging drilling water 2 from the front end of the drilling section 3, a closed pipe 4, in which the drilling section 3 is inserted to be movable and which shields a drilled hole H formed in the ground from the fresh air airtightly, a supply means 5, which supplies the drilling section 3 with the drilling water 2, a mud discharge means 6, which discharges the muddy water 21 resulting from the drilling work through the closed pipe 4, and a control means 10, which maintains the accumulated water pressure in the ground at a given level. According to the system 1 for drilling the ground, the supply of the drilling water 2 form the supply means 5 and the discharge of the muddy water 21 by the mud discharge means 6 are adjusted simultaneously while the accumulated water pressure in the ground is kept at the given level during the drilling work. COPYRIGHT: (C)2005,JPO&NCIPI
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