| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a boring machine used to bury a boring pipe in the ground. <P>SOLUTION: There is provided a boring machine which has a motor-integrated reduction gear in its forefront body and a direction correcting device and bypass valve in its body. The motor-integrated reduction gear has a hollow pipe passing through the inside thereof so that chemical or lubricant can be injected directly to bits. The direction correcting device is installed between the forefront body and the body to support the forefront body, and an inner surface of a joint mounted on the body receives a sphere formed at the tip of a cylinder rod mounted on the forefront body so that the forefront body is supported so as to freely swing. The bypass valve controls opening/closing of the bypass of a mud feeding pipe and a mud discharge pipe by driving a revolving-door-shaped rotary valve. The rear end of the boring machine is joined with a joint member having a center pipe, a mud feeding pipe, a mud discharge pipe, and a fluid pipe. <P>COPYRIGHT: (C)2012,JPO&INPIT |
