| 摘要 |
PURPOSE:To enable underground water pressure to a plurality of depths, to be measured at the same time by erecting an external pipe in a borehole, to fill a space between the borehole and the external pipe, with sealing material, and by forming water paths with a wing enlarging bit, to move a multiple packer type sonde down into the external pipe, to be suspended. CONSTITUTION:In a borehole 1, an external pipe 2 is erected, and a space between the borehole 1 and the external pipe 2 is filled up with sealing material 3. After that, into the external pipe 2, a wing enlarging bit 5 is moved down to be suspended, and the external pipe 2 and the sealing material 3 of the sections of specified depths are chipped from an internal side, and water paths 4 are formed. After that, in the external pipe 2, with a wire rope 9, a multiple packer type sonde 10 is suspended and is moved down to be set. Besides, when water pressure in the external pipe 2 comes to a steady state with underground water infiltrated through the water paths 4, then with the water pressure meter of the sonde 10, the underground water of a plurality of depths is measured at the same time. |
