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US 4,487,528 AGranted
Earth anchoring expansion body having folded sheet metal casing
AssigneeAtlas Copco Aktibolag
InventorBo T. Skogberg
Life of this patent
Estimating the term…
Abstract
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).
Claims14
Expansion body for anchoring constructions in the earth, comprising:
- a folded elongated sheet metal casing (11) which defines an internal closed space (15);
- means (14) for coupling internal closed space (15) to a source of pressurized fluid for the expansion of the expansion body by the pressing out of the folds (18, 19) of the sheet metal casing under the pressure of said pressurized fluid;
- said sheet metal casing comprising opposed portions (16, 17), which before said expansion have said folds (18, 19) thereof arranged in zigzag shape with the folds (18) of one of said portions (16) falling into the folds (19) of the other of said portions (17).
Dependencies are inferred from the claim text.