Patent ID: 7513712
Filing Date: 2009-04-07
Classification: E21F

Abstract:
1. A device comprising: a first covering and a second covering adapted to each be located at a certain distance from at least one wall and/or a ceiling of a cave, tunnel or cavern, each of the first and second coverings comprising a longitudinal lower edge side and a longitudinal upper edge side; a rigid extended ceiling draining pipe comprising a concave part having a first internal side edge and a second internal side edge, wherein the longitudinal lower edge side of the first covering is fastened to the first internal side edge of the concave part of the ceiling draining pipe, and the longitudinal lower edge side of the second covering is fastened to the second internal side edge of the concave part of the ceiling draining pipe, and the upper longitudinal side edges of the first and second coverings are configured to be fastened to the ceiling or the at least one wall of the cave, tunnel or cavern so that the first and second coverings each provide an inclined surface down to the ceiling draining pipe; a down pipe connected to the ceiling draining pipe; and at least one rock bolt secured to the concave part of the ceiling draining pipe, wherein the ceiling draining pipe is configured to be secured to the ceiling or the wall of the cave, tunnel or cavern via the at least one rock bolt that is connected to the ceiling draining pipe and to the ceiling or the wall of the cave, tunnel or cavern.