Tank i fjellrom, samt fremgangsmåte for å etablere en fuktsperre ved overflaten av en fjellvegg i et fjellrom

摘要

The invention relates to a tank system for storage of fluids in a cavern in a rock formation. Pipe loops (17) for circulation of a coolant are mounted on the surface of rock formation in the cavern. The pipe loops (17) are covered by a layer of shotcrete (18). The surface of the shotcrete is levelled by means of a layer of concrete (19), supporting a fluid tight barrier (33). A structurally supporting reinforced con­crete wall (34) is constructed outside the fluid tight barrier (33). The present invention relates also to a method for establishing a fluid tight barrier at the surface of a rock formation in a cavern. The barrier is obtained by artificially cooling down the temperature in the rock formation in the vicinity of the cavern by circulating the coolant. For this purpose pipe loops for circulation of a coolant are installed on the surface of the rock formation, whereupon the rock formation, including the pipe loops (17), are covered by a layer of shotcrete (18), whereupon the coolant is circulated through the pipe loops (17) in order to establish a controlled leakage barrier in the form of an ice plug.