| 摘要 |
PURPOSE:To connect rectangular pipes in series, and to obtain a guide pipe for burying the rectangular pipes in the ground while correcting the direction of excavation in the designed direction. CONSTITUTION:An earth auger 14 is disposed into a guide pipe body 1 composed of the double pipe of a rectangular outer pipe 2 and a cylindrical type inner pipe 3 while a space section between the inner and outer pipes 2, 3 is divided into four up and down and left and right, and L-shaped sectional hood support arm sections 16-19 are inserted into each divided space section in a longitudinal slidable manner. Hoods 6-9, in which external surfaces are formed in an L shape along sides adjacent to the right angles of the rectangular outer pipe and internal surfaces are formed in an inclined face expanded toward front ends, are set up integrally at the front ends of each hood support arm section 16-19 projected from the guide pipe body 1. The two hoods adjacent up and down and left and right are projected integrally, thus correcting the direction. |
