| 摘要 |
<p>PURPOSE: To improve deodorizing efficiency by measuring odor component density in the extreme end part of a soil discharge cylinder provided in a propulsion body in rear of a drilling blade, and injecting a deodorizing agent into the soil discharge cylinder according to the measured results. CONSTITUTION: Drilled earth and sand are discharged to a shaft through a soil discharge cylinder 18, and a deodorizing agent is infected into the cylinder 18 through a pump 44 and a deodorizing agent infection passage 40. Next, the drilled earth and sand and the deodorizing agent are mixed by an auger provided in the cylinder 18 so as to remove the odor component. In this case, the air of an odor sampling chamber 19 on the outer circumferential part of the cylinder 18 is carried to a measuring chamber 33 on the shaft side, and the odor component density is measured by an odor sensor 53. Corresponding to the odor component density, a controller 50 controls the pump 44, so as to infect an appropriate quantity of deodorizing agent against the odor component content differing due to change of a stratum. Further, compressed air is always supplied to the chamber 19 so as to quickly sense the change of density of odor component. Hence an appropriate quantity of the agent can be supplied, and quick correspondence to the change of odor component can be attained.</p> |
