SHIELDING DEVICE AND SHIELDING METHOD FOR PREVENTING INFLOW OF POLLUTED UPPER GROUNDWATER AND FOR BLOCKING SECTION

摘要

The present invention relates to a shielding device and a shielding method for preventing the inflow of polluted upper groundwater and for blocking a section, wherein the shielding device is used in order to prevent the inflow of polluted upper groundwater by using the advantages of an expansion tube and a compression tube such that shielding is enabled similar to the compression tube even though the expansion tube is damaged like the expansion tube, and that a shielding function can be obtained by an autonomous operation even if a lower end of a casing does not come in contact with the bottom of a borehole, and also, a section is capable of being blocked even in a middle position of the borehole. One or more shielding devices of the present invention, for preventing the inflow of polluted upper groundwater and for blocking a section, can be provided in a casing by comprising: a compression tube (20) which is provided on the circumferential part of the casing installed inside an underground borehole (1), and which is compressed so as to come into close contact with a hollow wall of the borehole by an external force; a spring for enabling the compression tube to come into close contact with the hollow wall of the borehole so as to seal the upper and lower parts around the compression tube; and a release means (40) which fixes the spring in a state of an elastic force opposite to an elastic force for enabling the compression tube to come into close contact with the hollow wall of the borehole, and which releases the fixed spring so as to generate the elastic force for enabling the compression tube to come into close contact with the hollow wall of the borehole.