PROPOSAL OF A METHOD TO REDUCE WORK ATOMOSPHERIC PRESSURE FOR CONSTRUCTION AT “ULTRA-GREAT DEPTH” BY PNEUMATIC CAISSON METHOD

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  • ニューマチックケーソンの超大深度施工を目的とした作業気圧低減方法の提案
  • ニューマチックケーソン ノ チョウダイシンド セコウ オ モクテキ ト シタ サギョウ キアツ テイゲン ホウホウ ノ テイアン
  • PROPOSAL OF A METHOD TO REDUCE WORK ATOMOSPHERIC PRESSURE FOR CONSTRUCTION AT ^|^ldquo;ULTRA-GREAT DEPTH^|^rdquo; BY PNEUMATIC CAISSON METHOD

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Abstract

 Pneumatic caisson method can be widely applied to various ground and has high reliability, while its applicable depth is restricted due to the work under high pressure. To overcome the problem, the pneumatic caisson method employing an unmanned excavation method with helium mixed gas has been developed, which enables the work under pressure up to 0.7MPa. However, the new technology of the pneumatic caisson method for “ultra-great depth” underground space with a groundwater level of 100m will be required to construct infrastructures in urban areas. Therefore, this paper proposes a method to reduce work atmospheric pressure for pneumatic caisson, applying water-sealing technologies at shield tail.

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