Abstract: A method for sealing a mass of stored waste containing cations comprises insulating the waste mass with at least one grout barrier which retains heavy metallic cations. The grout barrier is established by filling the hollows in the soil or fissured rocks with a grout containing specified amounts of cement, clay, siliceous products, sodium carbonate and alkali-metal tartarate.

Abstract: A method of obtaining the peak value of a signal. The signal is sampled at certain intervals of time. The value of the sampled signal is compared subsequent to sampling with a value previously stored in a memory. The higher of the two compared values is stored in the memory for later comparison with a value obtained during a subsequent sampling. The higher of the values stored in the memory is stored in another memory after a maximum signal has been obtained.

Abstract: Scaffolding that is intended for operations carried out at a certain height and involving horizontal forces as well as the recovery of these forces.The scaffolding includes a tower (5) consisting of at least one liquid-tight element (6) that can contain liquid ballast (9), means (1) of supporting the tower on the ground, and an operations deck (8) at the top of the tower.

Abstract: A composition for making impermeable walls and other underground structures comprising water, a cement, a silica compound in a dispersed form, and an activating agent selected from the group consisting of an alkaline base and an alkaline salt of a weak acid which do not contain silica, the ratio by weight of lime to silica being less than 1 and preferably between approximately 0.3 to 0.5.

Abstract: Prefabricated concrete component to be employed in the construction of walls poured in the ground. It has a sheet (2) of impermeable material that at least partly covers the excavation side (6) of the wall, which is to be left uncovered after the wall has been poured, that has at least one face that forms the excavation-side face of the panel while the other side has projections (3) cast into the concrete (1) that makes up the panel, and that can be attached impermeably to the sheet on an adjacent panel.

Abstract: Method of pouring a concrete wall panel directly in the ground, into which two concrete bars (1 and 2) are poured at an interval in such a way that the axis of the future wall will intersect their midpoint at a right angle, characterized by digging a trench extending through the bars, by positioning in the trench a reinforcement (13) with a transverse partition (9) generally along the axis of each bar, and by pouring a concrete panel in the trench between the two transverse partitions.

Abstract: The ground anchorage means comprises a reinforcement combined with an adjacent injection tube furnished with sleeves acting as retention valves and a distensible sack intended to obturate the drilled hole. The fixing zone of the reinforcement is protected by an impervious envelope made of a rot-proof and anti-corrosive material in which the reinforcement is immersed in a hardenable material such as grouting cement. The free zone is immersed in an anti-corrosive product, which may be flexible in another envelope or sheath, the two envelopes being joined together by a sealing sleeve. Application, particularly for supporting walls.

Abstract: The invention relates to a method of laying underground conduits along a trench dug into the ground and filled with sludge designed to prevent the trench walls from collapsing.The trench is at least partly lined with hardenable grout and the conduit laying operations are carried out under the protection of this grout so that, after the same has hardened, it seals the conduit into the ground.

Abstract: The invention concerns a wall remaining tight despite possible displacements of its panels because of the terrain.To this end, it involves joints formed of cylindrical parts 2 and 3, connected by a band 6 consisting of at least one fold 7, of such a kind that the allowed displacement of the panels 16 and 17 entails a deviation less than the length of the unfolded band 6.The invention applies to all tight walls.

Abstract: A method for measuring stresses or forces by measurement of variations of the magnetic properties of ferromagnetic substances under stress conditions. This is carried out by providing a ring of ferromagnetic material between two parallel faces on or between which the stresses are exerted, the ring defining a magnetic circuit, providing an electric coil within and around the ring, passing a current through the coil and measuring changes in the properties of the current to measure variations in the magnetic properties of the ring.

Abstract: A method and a device for obtaining a water-tight shield in a soil apt to being disintegrated by liquid jets, by driving a tool into the soil and filling the furrow left by the tool while it is taken off, by a settable mortar, the operation being repeated step by step so that the tool every time encroaches upon the shield portion obtained during the preceding operation. The tool is driven into the soil through the injection of a settable grout used for disintegrating the soil, which supports the walls of the excavation and is mixed with the disintegrated soil so as to provide a mortar which after setting will form the impervious shield, the injection of grout being carried on during taking off of the tool.

Abstract: An apparatus and method for measuring stresses or forces by measurement of variations of the magnetic properties of ferromagnetic substances under stress conditions. This is carried out by providing a ring of ferromagnetic material between two parallel faces on or between which the stresses are exerted, the ring defining a magnetic circuit, providing an electric coil within and around the ring, passing a current through the coil and measuring changes in the properties of the current to measure variations in the magnetic properties of the ring.

Abstract: A partially buried facility for the storage of petroleum products includes a liquid-tight equalization basin for containing water and an enclosure of at least partially dry terrain surrounding the basin, the enclosure being supported on a layer of impermeable terrain. In addition, a flat bottomed storage tank with a liquid-tight lining is located inside the enclosure and at least one lateral equalization well interrupts the bottom of the tank and penetrates the layer of impermeable terrain below. A liquid-tight pipe connects the equalization well with the equalization basin thereby enabling the equalization water to be maintained at a constant level.

Abstract: The invention relates to an obturating device more particularly designed for operating with a cavity such as an injection tube. Said device comprises a hollow body adapted to be connected with a duct for feeding a fluid under pressure to be injected, such as a cementitious grout. The body is provided with outlet ports at the vicinity of at least one of its ends, said end being covered by a flexible and resilient sleeve tightly engaged over the body and covering said outlet port. The said sleeve is provided with a comparatively thick bottom located between said end and a backing-piece, the assembly being arranged to be introduced in the injection tube or cavity with such a clearance that deformation of the bottom of the sleeve or sleeves under the effect of the pressure of the fluid ensures obturation of said tube or cavity.