| 摘要 |
PCT No. PCT/JP93/00613 Sec. 371 Date Jan. 12, 1994 Sec. 102(e) Date Jan. 12, 1994 PCT Filed May 10, 1993 PCT Pub. No. WO93/23136 PCT Pub. Date Nov. 25, 1993.A work member comprising a sludge scraping member is guided by a monorail guide so that the guide and work member can be constructed in the most simplified form, and the working performance can be made excellent at the same time. By simplification of the construction, the installation work can be made easily, and the running and maintenance costs become low.
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