Abstract: There are provided a method for the bottom-side separation of a body which is to be worked out of rock (2000), in which a first part of the bottom surface of the body to be worked out of the rock (2000) is separated by removing the rock (2000) situated below the bottom surface, and a second part of the bottom surface is separated by replacing rock (2000) situated below the bottom surface with a layer system (140, 240, 440, 540) which has two unconnected separating layers (141, 142, 241, 242, 441, 442, 541, 542, 1310, 1320), with the result that the body to be worked out of the rock (2000) is supported in the region of this second part of its bottom surface by the layer system (140, 240, 440, 540), and a system (1000), which is suitable for carrying out such a method, for the bottom-side separation of a body to be worked out of a rock (2000), having an advancing unit (1100) for removing a rock layer, a discharge conveying unit (1200) for conveying away rock (2000) removed by the advancing unit (1100), a laying

Abstract: A potential energy store has a hydraulic cylinder in which a piston for storing energy in the form of potential energy of the piston is arranged. A position of the piston relative to the earth's surface can be varied. A pump pumps hydraulic fluid via lines into the hydraulic cylinder such that the piston is raised. A generator converts hydraulic energy of hydraulic fluid, which is displaced out of the hydraulic cylinder as the piston falls, into electricity. A seal arrangement is at least partially arranged between the hydraulic cylinder and the piston. The seal arrangement has a sealing section with a flexible support structure for absorbing the acting forces. The support structure may be coated on one or both sides with a layer which is impervious to fluid and which seals against the passage of fluid or may be impregnated with a solidified material which is impervious to fluid.

Abstract: A damp-proof layer is provided for creating a seal for a potential energy store. The damp-proof layer has a supporting structure of wire ropes arranged next to one another or sections of one or more wire ropes arranged next to one another. At least parts of the plane in which the wire ropes lie, or at least parts of a plane running parallel thereto, form a fluid-tight surface or layer, in which the wire ropes, at the ends of the damp-proof layer, are each secured to an anchor piece for anchoring the damp-proof layer or are guided around the anchor piece. Between each two anchor pieces there is in each case arranged an elastic element. A seal is assembled from damp-proof layers on a potential energy store with a hydraulic cylinder, in which there is arranged a piston for storing energy in the form of potential energy of the piston.

Abstract: A potential energy store has a hydraulic cylinder in which a piston for storing energy in the form of potential energy of the piston is arranged. A position of the piston relative to the earth's surface can be varied. A pump pumps hydraulic fluid via lines into the hydraulic cylinder such that the piston is raised. A generator converts hydraulic energy of hydraulic fluid, which is displaced out of the hydraulic cylinder as the piston falls, into electricity. A seal arrangement is at least partially arranged between the hydraulic cylinder and the piston. The seal arrangement has a sealing section with a flexible support structure for absorbing the acting forces. The support structure may be coated on one or both sides with a layer which is impervious to fluid and which seals against the passage of fluid or may be impregnated with a solidified material which is impervious to fluid.