E - Fixed Constructions – 21 – D
Patent
E - Fixed Constructions
21
D
61/25, 61/2.2
E21D 9/00 (2006.01) E21F 17/103 (2006.01)
Patent
CA 1334793
A dam for sealing an underground passage extending along an axis is formed with a pair of end ridges themselves formed by- oppositely inclined inner and outer surfaces and at least one middle ridge also formed by a pair of oppositely inclined surfaces. The surface projected parallel to the axis of the outer end-ridge surfaces is larger than the surface projected parallel to the axis of the dam of the inner end-ridge surfaces and the middle ridge is offset outward, that is into the earth bounding the space, of the end ridges by a distance equal to at least the difference between the sizes of the projections.
584479
Hafner Frieder
Kockritz Volker
Oellers Thomas
Sitz Peter
Bergakademie Freiberg
Deilmann-Haniel Gmbh
Fetherstonhaugh & Co.
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