| 摘要 |
PROBLEM TO BE SOLVED: To provide a placing device for increasing a de-energizing effect of a de-energizing cyclone, preventing deterioration in quality by separation of a material, easily coping with a change in the depth of water by vertically driving a tremie pipe, holding the inside of the tremie pipe in a full pipe state by mixing solidifying processing soil, flowing down/delivering the mixing solidifying processing soil in the full pipe state, preventing a backflow of outside water, and performing a displacement method for high grade improved soil in an in-pipe mixing solidifying processing construction method for reclamation work of a harbor. SOLUTION: Initial de-energization is performed by an impact dispersing blade of a projecting part of an inside surface of the de-energizing cyclone 11. The de-energizing effect is increased by forming a mud reservoir simultaneously when performing the final de-energization by a partition plate of a bottom part. The tremie pipe 12 is vertically rotatably arranged on a de-energizing cyclone bottom part side surface via a horizontal discharge pipe, a swivel joint and a connecting bent pipe, and can be vertically driven, and the driving length is changed according to the depth of water by pulling-up of the tremie pipe and attachment-detachment of a divided pipe 12a. A flap valve 50 for automatically opening-closing by a counterweight is arranged on the tip of the tremie pipe 12. COPYRIGHT: (C)2004,JPO
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