| 摘要 |
PROBLEM TO BE SOLVED: To save work execution manbow for installation at a site and a curing period at a place where adjacent bottom plates are not in level. SOLUTION: A bottom plate block 3 is arranged at a level different portion of a connection between adjacent box culverts 1, 2 and mounted to the bottom plate 2a of the box culvert 2. For its purpose, through-hole 3c... are provided downwardly from the upper face 3a, with the lower sides matched to the inside configuration of the bottom plate 2a and the corner of the box culvert 2. To inserts 2c... provided in the box culverts 2, the bottom plate block 3 is secured via the through-holes 3c... with long bolts 4....
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