| 摘要 |
PROBLEM TO BE SOLVED: To provide a block for a closed conduit for restraining the deterioration in the drain function even if positional dislocation is caused a little in the mutual blocks for the closed conduit. SOLUTION: This block 10 for the closed conduit forms mutually shiplap parts 11 and 11 projecting in the longitudinal direction of the closed conduit by applying a cutout for mutually joining the mutual blocks 10 for the closed conduit adjacent in the closed conduit longitudinal direction by mutual shiplap joint. The blocks 10 for the closed conduit adjacent in the closed conduit longitudinal direction are joined by mutually shiplapping the shiplap part 11 and 11. COPYRIGHT: (C)2005,JPO&NCIPI
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