Abstract:
The invention relates to a method and arrangement for providing effect of a polymer on soil. The disclosed solution provides an injection structure (4) for arranging the effect of the polymer on the soil. The injection structure (4) comprises at least two injection elements (5). The injection element (5) comprises a frame pipe (6) through which the polymer is injected, and means for conveying the effect of polymer on the soil. The frame pipe (6) includes connection means (9) for connecting the injection element (5) as a part of the injection structure (4). The injection structure (4) comprises at least two injection elements (5) interconnected on site in such a manner that the injection elements (5) included in the injection structure (4) are separately transportable to the working site.
Abstract:
The instant invention relates to a process allowing the encapsulation of a polymerization accelerator, said process comprising the steps of: a) providing an reverse emulsion containing, in an oil phase, a water solution/dispersion containing the polymerisation activator, the oil phase including a heat curable mixture of an isocyanate and a polyalkyldiene hydroxylated or polyol, b) pouring the reverse emulsion in a water phase to make a multiple emulsion water/oil/water, containing drops of activators as the internal water phase, and then, c) heating the multiple emulsion obtained in step b) at a temperature of between 50 and 95°C, in order to cure the polyisocyanate in polyurethane and obtain drops of activator enclosed in shells of polyurethane dispersed in water. The invention also relates to aqueous gelling systems comprising the encapsulated polymerization accelerator with water soluble or dispersable monomers and a polymerization initiator dispersed in said monomers, useful i.a. for sealing subterranean environments or consolidation of a soil or sealing of a subterranean structure.
Abstract:
Systems and methods for filling submerged voids (102) with a foam-fluidized fill material (104) in an efficient and economical manner are disclosed herein. The foam fluidized fill material (104) is a granular solid material fluidized with a foam. The foam-fluidized fill material (104) is pumped or gravity-fed through an insertion tube (118) into the submerged void (102). The insertion tube (118) terminates at a point lying below a surface (122) of the liquid (106) within the void (102). Since the foam-fluidized fill material (104) is heavier than the liquid (104), the foam-fluidized fill material (104) exiting the insertion tube (118) sinks to the bottom of the void (102) and expands laterally at the bottom of the void (102) displacing the liquid (104). The liquid (104) is forced upward and out of the void (102) where it may be collected. Further, as the fill material (104) fills the void (102), the foam dissipates and the fill material (104) self compacts, making the filled void sufficiently load bearing.
Abstract:
A soil and/or rock conditioning machine including a feed hopper to feed material to be conditioned to a feed conveyor and a mixing chamber including one or more rotors to accelerate the material particles direct from the end of the feed conveyor against inclined surfaces in the mixing chamber.
Abstract:
The invention relates to a soil strengthening composition for strengthening low moor peat. The invention provides a composition which can be used for mechanically strengthening low moor peat, and more particularly Holland peat, in a suitable manner. The composition according to the invention penetrates the peat well and crystallizes in the peat, so that a solid foundation for possible buildings is formed.
Abstract:
The present invention provides processes for infrastructure repairs and geo-stabilization with a low-exotherm polyurethane foam, grout or elastomer. The inventive process involves at least partially filling a cavity in the infrastructure or earth with a low-exotherm polyurethane foam, grout or elastomer made from at least one polyisocyanate, at least one isocyanate-reactive compound and an organic particulate material capable of absorbing heat, optionally in the presence of one or more chosen from water, surfactants, pigments, catalysts, alkali silicates and fillers and curing the polyurethane foam, grout or elastomer. The inventive processes may improve the repair of buildings, foundations, roads, bridges, highways, sidewalks, tunnels, manholes, sewers, sewage treatment systems, water treatment systems, reservoirs, canals, irrigation ditches, etc.; and in the geo-stabilization of mines, caves, wells, bore-holes, ditches, trenches, pits, cracks, fissures, craters, postholes, potholes, sinkholes, wallows, waterholes and the like. The inventive solid polyurethane compositions are made from at least one polyisocyanate, at least one isocyanate-reactive compound, and an organic particulate material capable of absorbing heat, optionally one or more chosen from water, surfactants, pigments, catalysts and fillers. Such solid polyurethane compositions may improve reaction injection molding (RIM), spray elastomer and cast molding processes.