| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce the volume of sludge discharged during boring work, facilitate treatment and recycling of the discharged sludge, reduce the load of boring machine due to decrease in viscosity of a boring liquid, and furthermore, reduce the whole construction period and the cost of construction by shortening the measuring time of boring trajectory by means of a gyroscope which affects the construction time. <P>SOLUTION: In a boring device 10 used for curved boring method, an air bubble liquid producing and feeding device 60 feeds air bubble liquid to a leading-end bit 40 through a boring pipe 20 and boring work is carried out while injecting the air bubble liquid around the front-end bit 40. In a step of inserting a gyroscope 30 into the boring pipe 20, a high-pressure fluid feeder, for example a compressed-air feeder 50, sends out high-pressure fluid, for example compressed air, into the boring pipe 20 to force-feed the gyroscope 30 toward the front-end part of the boring pipe 20. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
