| 摘要 |
PROBLEM TO BE SOLVED: To provide a side cluster for subterranean structures for which rapping can be performed easily even though a concrete mold forming the inner wall surfaces is a single mold; shaping work can be easily performed; production efficiency can be easily improved; and also when connecting a guide pipe to an opeing portion, its tip edge can be easily made flush with the inner wall surface of the cylindrical body. SOLUTION: At the side cluster M for subterranean structures erecting a cylindrical body 12 at the peripheral edge of a base panel 11, at least the inner wall surface ofthe cylindrical body 12 is sloped to the outer side facing the tip end. Also, an opening 20 is provided at the side wall portion 121 of the cylindrical body 12, and the vicinity of the opening 20 on the inner wall surface of the cylindrical body 12 is made to a vertical surface relative to the base panel 11. COPYRIGHT: (C)2005,JPO&NCIPI
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