| 摘要 |
PURPOSE:To form a continuous pipe having no seam in a desired direction by a method in which materials are continuously sent into the front of a cylindrical space-forming part with a closed front end and an opened rear end, and the cylindrical space-forming part is advanced. CONSTITUTION:When the pressure-sending pump 23 of a working vehicle 16 is driven and materials 90 are sent under pressure into a cylindrical space 31, the materials 90 are melted by a heating element 36, moved backwards while being cooled gradually to solid state, and reaches the rear end of an annular groove 12. When the materials 90 are further sent continuously, the cylindrical space- forming part 30 receives a great propulsion toward the front and is advanced by rewinding slowly a wire 40 from a winch 38, during which period a continuous pipe 91 is formed. The cylindrical space-forming part 30 moves forwards along the ground's surface 42 away from a housing 10 while properly altering its bilateral directions under an adequate external force. |
