| 摘要 |
<p>PROBLEM TO BE SOLVED: To efficiently transmit propulsion with a simple structure, facilitate bending, and facilitate attaching detaching work in a jacking body for a small diameter pipe jacking method for constituting the bendable continuous jacking body by connecting a large number of mutual unit jacking bodies so that an angle can be varied. SOLUTION: Connecting pieces 18 are formed on the left and right on one end of the unit jacking bodies 14. Projecting parts 20 insertable between these connecting pieces 18 are formed on the other end. These fitting connecting pieces 18 and projecting parts 20 are journalled by half screw pins 24 screwed in from the outside of the connecting pieces 18. A defective part for allowing bending is formed with a tip upper surface of the projecting parts 20 of the unit jacking bodies 14 as a taper surface part 21a. A defective part becoming no resistance by protruding at bending time is formed with an end under surface as a taper surface part 21b.</p> |
