| 摘要 |
<p>PURPOSE:To permit a pipe to be buried to be dragged in the penetrating direction of pipes under the ground by a method in which a pressure fluid nozzle is airtightly connected to the tip to be penetrated under the ground of a pipe and a nozzle port is formed in the opposite direction of the penetrating direction. CONSTITUTION:Since the internal pressure of a vinyl pipe 6 housed in a pressure tank 8 is equal to the pressure of water in the tank 8, no deformation in the radial direction takes place in the pipe 6, and the pipe 6 becomes straight line form by the internal pressure of the pipe 6 drawn out to the open air. The internal pressure of the pipe 6 applies to all the bottom face of the nozzle 1 and thereby the nozzle 1 is made to drive to the advancing direction. Since the resultant force of the propellent force to the advancing direction and the propellent force to the advancing direction of the nozzle 1 by jet force from a reverse jet nozzle 3 overpowers the resultant reaction force of the front jet force of the nozzle 1 and the earth pressure, the pipe 6 is dragged by the nozzle 1 and penetrated into the ground. By this pipe 6 being penetrated, the laying of the pipe 6 is completed.</p> |
