Method and device for obtaining a water-tight shield in the soil with the use of nozzles
AssigneeSoletanche
InventorJacques Rochmann
Life of this patent
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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.
Claims18
In a method for obtaining a water-tight shield in a soil by driving a tool in the soil and injecting a settable grout to disintegrate the soil, the grout being mixed with the disintegrated soil for providing a mortar which after setting will form said shield, the improvement wherein the grout is injected through an injection nozzle with a comparatively low flow rate under a comparatively high pressure and is then mixed with the soil by a recycling through use of a hydraulic transformer associated with said injection nozzle, said transformer operating to increase the flow and decrease the pressure of the grout with respect to the flow and pressure through said injection nozzle.
In a device for obtaining water-tight shields in soils apt to be disintegrated by liquid jets, by driving a tool into the soil and filling the furrow made by the tool while it is taken off, by means of a settable mortar, the operation being repeated step by step, including a grout supply, a tool connected at its head end to said grout supply and fitted at its tail end with liquid ejection nozzles, and means for supporting said tool, the improvement wherein said tool is formed of tubes parallel to each other and bridged by struts of a thickness less than the tube diameters to permit a rear one of the tubes to be driven into the furrow left by a fore one of the tubes as a result of a preceding operation of the tool.
In a device for obtaining a water-tight shield in a soil and including a tool driven in the soil for injecting a settable grout to disintegrate the soil, the grout being mixed with the disintegrated soil for providing a mortar which after setting will form said shield, the improvement wherein said tool comprises an injection nozzle for injecting grout with a comparatively low flow rate under a comparatively high pressure, a hydraulic transformer associated with said injection nozzle for mixing grout with soil and operating to increase the flow and decrease the pressure of the grout with respect to the flow and pressure through said injection nozzle.
Dependencies are inferred from the claim text.