underground breathable inspection method and soil pollution survey methods

摘要

The present invention To provide an underground air permeability test method that can be inferred possible presence of contaminants the high ground of the location with pinpoint. A From the first discharge hole formed at the lower end of the drilling tube 5 a pressurized gas to the pressure is supplied to the drilling pipe 5 is intruded up to a predetermined depth F of the ground M in pressure vessel within 79 It is injecting the gas into the ground M. From the start of the infusion, the pressure in the pressure vessel 79 measures the pressure reduction time required until the drops to a second pressure below the first pressure. We want to change the depth F to other depth F with respect to the ground M of drilling pipe 5 When the measurement is completed. To test the air permeability of the underground M is again carried out and the measurement of injection and decompression time of gas After changing depth.BACKGROUND 7