| 摘要 |
PCT No. PCT/JP98/02416 Sec. 371 Date Jan. 27, 1999 Sec. 102(e) Date Jan. 27, 1999 PCT Filed Jun. 1, 1998 PCT Pub. No. WO98/54071 PCT Pub. Date Dec. 3, 1998A grit tank (1), the inside of which is partitioned into an upper chamber (2), intermediate chamber and lower chamber (5), the intermediate chamber being partitioned into a left intermediate chamber (3) and a right intermediate chamber (4), is connected to a transport pipe (16) via a discharge port (9) of the lower chamber (5). The intermediate chambers (3, 4) are respectively communicated with the upper chamber (2) and the lower chamber (5) via a left upper communicating port (6) and a right upper communicating port (10) and also via a left lower communicating port (8) and a right lower communicating port (12). The communicating ports are respectively provided with a left filling valve (7), right filling valve (11) and changeover type feed valve (13). Between the upper chamber 2 and the intermediate chambers (3, 4) and also between the lower chamber (5) and the intermediate chambers (3, 4), there are respectively provided a left upper pressure equalizer pipe (23), right upper pressure equalizer pipe (24), left lower pressure equalizer pipe (25) and right lower pressure equalizer pipe (26).
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