| 摘要 |
PROBLEM TO BE SOLVED: To provide a coupling device which can be manufactured at low cost and easily disassembled. SOLUTION: This coupling device allows coupling between two-liquid injection tubes P and P for soil improvement, which is composed of a double tube of inner and outer tubes 1 and 2. An end of the outer tube 2 of one tube P and that of the outer tube 2 of the other tube P are screwed into both ends of a sleeve 5 for coupling the outer tubes 2 together, so that the outer tubes 2 and 2 of both the pipes P and P can be coupled together. One end of a first sleeve 6 for the inner tubes 1 and 1 together is screwed into an end of the inner tube 1 of one tube P; one end of a second sleeve 7 is screwed into an end of the inner tube 1 of the other tube P; and the other ends of both the first and second sleeves 6 and 7 are fitted into each other, so that the inner tubes 1 and 1 of the tubes P and P can be coupled together. Alignment members 8 and 9, which aligns the inner tube 1 with the outer tube 2 by supporting an outer peripheral part on an inner peripheral surface of the outer tube 2, are mounted at the respective ends of the inner tubes 1 and 1 of both the tubes P and P. COPYRIGHT: (C)2003,JPO
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