| 摘要 |
<p>PURPOSE: To hardly damage an underground pipe to be buried and efficiently conduct the pipe installing work. CONSTITUTION: A long propulsion body 4 is advanced under the ground to penetrate an arrival section 5, an underground pipe 3 is pulled and installed into the underground hole H formed by the underground advance of the propulsion body 4, and an outwardly couplable sheath pipe 8 is provided on the underground pipe 3. The sheath pipe 8 is outwardly coupled with the underground pipe 3, and the underground pipe 3 and the sheath pipe 8 are integrally connected to the propulsion body 4 penetrating the arrival section 5. The propulsion body 4 is pulled back to the start side, and the underground pipe 3 and the sheath pipe 8 are pulled into the underground hole H and installed.</p> |
