| 摘要 |
PROBLEM TO BE SOLVED: To prevent the floating of an air bag when using the earth retaining air bag in an open-cut ditch to prevent the collapse of side walls. SOLUTION: The outer surface of the air bag 20 is provided with a rough surface 21 for increasing friction with the natural ground or the earth retaining material, for example, a rough surface provided with a latticework, a network, a combination of rise and fall having various cross section, and uneven projecting parts and recessed parts, or projections respectively formed of a bar-like or an angular projecting body.
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