Abstract: The invention relates to a pressurized fluid storage tank (1) adapted to be disposed underground at a slight depth. The invention comprises a ring (2) forming the side wall of the tank and two horizontal circular walls disposed in said ring and forming respectively the bottom wall (4) and the top wall (9) of the tank (1). Tie rods (8) are disposed between the top wall (9) and the bottom wall (4), these tie rods (8) being adapted to take the stresses resulting from the pressure of the stored fluid on said bottom wall (4) and top wall (9), leakproofing means (10) adapted to make the tank impervious to the fluid stored lining the interior of the tank (1). The tank (1) according to the invention permits storage under excellent conditions of inconspicuousness and safety. The invention is more particularly applicable to the storage of pressurized fuel fluids.

Abstract: The invention relates to a device for fixing a stressed anchorage in rock, comprising sealing components (7) to be sealed in place at the end of a predrilled hole (6) by the sealing material contained in a cartridge (2) fitted in the head of the device and protected by a perforated cap (5). When the device is put in place, the sealing head is fastened to the anchorage sleeve (11) by an unlockable connecting element (9, 10).