| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To simultaneously measure a gap water pressure and a ground vibration at reasonable cost. <P>SOLUTION: A tube structure 1 for measuring bedrock is constituted by erecting, in a bore hole 5, a double tube 4 composed of an outer tube 2 and an inner tube 3 arranged inside the outer tube. On the external peripheral surface of the outer tube 2, a plurality of packers 6 are provided in such a way as to annularly surround its circumference and as to be arranged apart from each other along the axis of the member. The tube structure 1 includes pipes 7 for the packers connected communicating so as to communicate with the internal filling spaces of the packers 6 respectively, and gap pipes 10 for measuring water-pressure arranged so as to communicate with outside spaces 9 of the outer tube 2 extending between adjoining packers 6, 6. The pipes 7 for the packers and the pipes 10 for measuring gap water-pressure are arranged, while being inserted into the gap space 12 extending between the external peripheral surface of the inner tube 3 and the internal circumferential surface of the outer tube 2. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
