| 摘要 |
PROBLEM TO BE SOLVED: To provide a propelling pipe connection structure which is simple and high in cutoff effect. SOLUTION: The propelling pipe connection structure is constructed by fixing a cylindrical collar member 11 to the periphery of an end of one of propelling pipes 10A connected to each other, in a manner protruding from an end face of the propelling pipe, forming a connection fitting portion 12 in an end of the other propelling pipe 10B, fitting the connection fitting portion 12 into the collar member 11, and sealing a gap between the collar member 11 and the connection fitting portion 12 with an annular elastic sealing member, to thereby cut off water at a connection portion between the serially connected propelling pipes. In the structure, the sealing member consists of an inner pressure sealing member 13 and an outer pressure sealing member 14. The inner pressure sealing member 13 is fixed to and diagonally protruded from the inner peripheral surface of the collar member, and deformed in an erecting direction upon application of water pressure from the interior of the propelling pipe. The outer pressure sealing member 14 is fixed to and diagonally protruded from the outer peripheral surface of the connection fitting portion 12, and deformed in an erecting direction upon application of water pressure from the outside of the propelling pipe. COPYRIGHT: (C)2004,JPO
|
