| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and method for forming an impermeable layer in a boring well for easily removing an obstruction such as a harmful layer or crack caused in the boring well. SOLUTION: This device 30 for forming the impermeable layer in the boring well 1, which is intended to remove an obstruction caused in a drilled hole 1a, comprises a layer forming body 31 inserted to the hole, a positive electrode 34 provided on the layer forming body, negative electrodes 32 and 33 provided on the layer forming body in positions separated from the positive electrode by a predetermined distance in the inserting direction of the layer forming body, and a DC power source 35 for carrying current to between the positive electrode and the negative electrodes. The positive electrode is located in a desired position near the position where the obstruction is caused, and current is carried from the DC power source in a state where clay-dissolved water 15 containing clay mineral is supplied into the hole to adhere the grains of the clay mineral to the surface of the positive electrode, whereby the impermeable layer 40a is formed to remove the obstruction. COPYRIGHT: (C)2006,JPO&NCIPI
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