Abstract: In a method for excavating rock cavities in the form of substantially cylindrical, vertical or low placed rock cavities for the storage of gas, fluid, solid products or for another purpose, one first, from a transport tunnel (2), excavates an upper circular room (3). From this circular room (3), one excavates the roof shape of the rock cavity (1) to be; and then, from a second transport tunnel (7) excavates a second annular tunnel (5) from a middle level in the rock cavity (1) to be. From the second transport tunnel (7), one also excavates a lower circular room (8) situated on a level which is substantially at the level where the lowest level of the rock cavity (1) to be, is. At this lowest level one excavates a third annular tunnel (13); between the circular room (8) and the third annular tunnel (13) provides tap holes (9).

Abstract: Before the rock cavity is completely excavated a plurality of arcuated tunnels extending between the top and bottom levels of the intended rock cavity are cut out in the rock outside the future side walls of the cavity, and these tunnels are filled with reinforcing material, preferably concrete, so as to form a rib-like reinforcement structure which is wholly embedded in the rock surrounding the rock cavity.