| 摘要 |
PROBLEM TO BE SOLVED: To provide an undergroundwater passage type pneumatic caisson, which does not obstruct the passage of undergroundwater more than required. SOLUTION: In the pneumatic caisson 11 with an approximately cylindrical caisson skeleton 12, a work-room slab 13 installed on the lower side of the skeleton 12 and a caisson cutting edge 14 mounted on the lower side of the slab 13, water-passing layers 18, 19 and 20, through which undergroundwater can be passed, are secured to at least one of the skeleton 12, the slab 13 and the cutting edge 14. COPYRIGHT: (C)2005,JPO&NCIPI
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