地盤掘削改良装置チェーンコンベアカッタ(CCC) の開発

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  • Development of Ground Improvement Machinery Chain Conveyor Cutter (CCC)
  • ジバン クッサク カイリョウ ソウチ チェーンコンベアカッタ(CCC)ノ カイハツ

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Chain Conveyor Cutter (CCC) is a chain saw type machine developed for deep mixing ground improvement. Unlike ordinary chain conveyors, CCC is installed on a pile driving rig and is penetrated down to and lifted up from the ground excavating and vertically mixing the cut soil with cement slurry. CCC consists of a drive unit, a return unit, a conveyor trough of the middle post and chain units. Chain units consist of twin strand link chains, scraper bars and conical bits mounted on bit plates installed on the scraper bars. While being sunk into the ground, running bits cut soils around the return unit at the bottom of the machine injecting cement slurry and haul up and down the cut soils and slurry making use of its conveyor function. The cutting ability of CCC is based on the 180kW water cooled electric motor and the weight of the machine. The maximum cutting force reaches around 600kN and the weight is more than 20t, which enables CCC to deal with versatile types of soils as hard as soft rocks. The mixing ability of CCC is based on the vertical conveyor effect of the chain unit. Twin strand outboard chains, a scraper bar and a bit plate on the scraper bar form a structure like a bucket. The buckets vertically run on the troughs presented by middle posts and haul up and down the slurry and soils from the bottom of the machine. The cyclic movement of the slurry and the soil contribute to establish uniform soil cement bodies. In the actual operations, CCC encountered hard materials like gravels, conglomerates and artificial debris, which caused damages to the chain units of CCC. Those damages made it so clear the necessity of sophisticated chain speed control system that inverter control system was developed and introduced. CCC constructed approximately 2,000m cut-off walls surrounding settling ponds for receiving dredged materials in the port of Miike restoring works.

収録刊行物

  • 資源と素材

    資源と素材 129 (8_9), 559-568, 2013

    一般社団法人 資源・素材学会

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