| 摘要 |
PROBLEM TO BE SOLVED: To shorten the switching operation time for supplying pulverulent body from a plurality of small-capacity tanks and to enable moderate and stable switching and supply of pulverulent body to each casing pipe in order to attain a system for continuously and stably supply a large-amount of pulverulent body in forming a large-bore diameter establishment pile and juxtaposed construction pile in DJM (pulverulent body jet and mixing method. SOLUTION: Loss of pulverulent body to be supplied through a load cell 100 to a plurality of small-capacity tanks 71 is transmitted to a control device 96 so as to control the supply and discharge of compressed air to each tank 71 in good timing, so that feeders 83, 84 and the respective tanks A, B97, 98 are operated in a short time as much as possible, and passages are integrated into one passage 77 through confluent valves 90, 91, whereby the supply to the respective casing pipes 5 of juxtaposed plants 200 is controlled to a very short time, and the continuous supply of each tank 71 can be stably performed in a large amount so as to achieve designated soil improvement. COPYRIGHT: (C)2004,JPO
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