Abstract: The object of this invention is to provide a fiber-reinforced concrete cask that ensures easy working, enables reducing working cost, excels in strength, durability and heat resistance and enables minimizing cracking; a process for fabrication of the same; and a supporting frame for molding the concrete cask. In particular, concrete cask (10) formed through injecting and solidification of concrete (11) is characterized in that sheets of reinforcement fibers having a thermal expansion coefficient equal to or lower than that of concrete (11) are provided on at least the outer circumferential surface and the inner circumferential surface of the concrete cask (10) and that the inner circumferential surface of outer sheet (21) and the outer circumferential surface of inner sheet (22) are connected with each other by strings of reinforcement fibers (23). Preferably, carbon fibers are used as the reinforcement fibers.

Abstract: The object of this invention is to provide a fiber-reinforced concrete cask that ensures easy working, enables reducing working cost, excels in strength, durability and heat resistance and enables minimizing cracking; a process for fabrication of the same; and a supporting frame for molding the concrete cask. In particular, concrete cask (10) formed through injecting and solidification of concrete (11) is characterized in that sheets of reinforcement fibers having a thermal expansion coefficient equal to or lower than that of concrete (11) are provided on at least the outer circumferential surface and the inner circumferential surface of the concrete cask (10) and that the inner circumferential surface of outer sheet (21) and the outer circumferential surface of inner sheet (22) are connected with each other by strings of reinforcement fibers (23). Preferably, carbon fibers are used as the reinforcement fibers.

Abstract: A submarine power storage system includes a unit base constructed on the floor of the sea, which base has seats for a plurality of electromechanical containers. Each such container has a turbine, a generator, a motor and a pump. The system also includes a plurality of battery tanks which are connected to the unit base.

Abstract: The present invention relates to a method of manufacturing a tank which is too large to be built on the ground. In the method, a floating station (1012) is built on the sea, surrounding a first spherical shell section (1002a) which constitutes one end of the tank. In the floating station, a hollow cylindrical section is built in a vertical position, connected to the first spherical shell section. The second spherical shell section (1002b) constituting the other end of the tank is connected to the open end of the hollow cylindrical section.