| 摘要 |
<p>An expansion body for constructions like piles or anchorages located in the earth, said body being adapted for insertion into the ground in a compact shape and expanded therein to an expanded shape. The expansion is achieved by unfolding a folded sheet metal casing (11) by filling it up with pressurized fluid. The sheet metal casing which defines two opposed portions (16, 17) is folded in a zigzag shape before the expansion with the folds (18) of one portion (16) falling into the folds (19) of the other portion (17).</p> |
