| 摘要 |
PROBLEM TO BE SOLVED: To fix a plurality of walls to an outer wall by using one kind of a socket. SOLUTION: Fixing parts 4, 14 having openings 6, 16 into each of which a socket 28 is inserted are arranged respectively on the outer wall 2 and an inner wall 12 of a sewage treatment tank. At least one intermediate wall 8 is interposed between the outer wall 2 and the inner wall 12 in a place different from the fixing parts 4, 14. Both of fixing parts 4, 14 are tightly fixed to each other and the interposed intermediate wall 8 is clamped tightly between the outer wall 2 and the inner wall 12 by fastening force of a nut 20 to a flange part 30 of the socket 28. COPYRIGHT: (C)2008,JPO&INPIT
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