| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of joints and positions connecting the joints and to enhance efficiency of installation for installing pipes.SOLUTION: An aboveground joint 20 has a U-shape pipe joint 21 in which a first port part 21a is arranged in one end and which has through holes r1, r2 bifurcated from the first port part 21a and extending in a general U-shape and a pair of branched pipes 22A, 22B arranged generally parallel from a branched end 21b of both ends of the through hole U-shape pipe joint 21 and having second port parts 22b in communication with upper ends of tubes respectively, the pair of branched pipes 22A, 22B themselves are arranged at intervals (gap S), and connects the upper ends themselves of the two tubes embedded underground while directing axial direction in a vertical direction. |
