US 4,537,527 AGranted

Means for providing a vertical drain in soil

AssigneePohjavahvistus Oy

InventorsMauno O. Juhola, Matti Numminen

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Abstract

Apparatus for providing a vertical drain in the soil, comprising a push tube to be pushed into the soil and which carries within it a prefabricated drain, provided with an anchor on the lower end, said prefabricated drain remaining in its place with the aid of an anchor while the push tube is being pulled back upwards. The push tube carries within itself a cut-off device at its lower end for the prefabricated drain, cutting it at desired height. Thereafter, the push tube is, if needed, lifted up for another anchor to be affixed to the lower end of the prefabricated drain. The object of the invention is to achieve that the prefabricated drain that has been cut off inside the push tube is pushed out from the lower end of the push tube. As taught by the invention, the push tube carries inside itself above the cut-off device pushing members which are located on both sides of the prefabricated drain and press the prefabricated drain between themselves with the aid of operating member and move it downwards so that the lower end of the prefabricated drain will project below the lower end of the push tube for another anchor to be affixed to the lower end of the prefabricated drain.

Claims5

Dependent claims

Apparatus for making a vertical drain in soil, comprising a push tube to be pushed into and pulled up from the soil and which carries within it a prefabricated drain having an anchor on a lower end thereof which aids in keeping the prefabricated drain stationary when the push tube is being pulled upwards, a cutting-off means carried within said push tube at a lower end thereof for cutting the prefabricated drain at a desired height which is within said tube, pushing means provided within said push tube above the cutting-off means for pushing a leading uncut end of the prefabricated drain within said tube to a point that is below the bottom end of the tube, said pushing means comprising pressing means mounted on both sides of the prefabricated drain and arranged to press against the prefabricated drain from opposite sides, and operating means for actuating said pressing means to press the prefabricated drain therebetween and move said pressing means and prefabricated drain downward together a desired length in said push tube so that said leading uncut end protrudes below the bottom end of the tube, whereby another anchor can be affixed to the lower uncut end of the prefabricated drain protruding from the push tube for use with a new drain section after the push tube is pulled up.

Dependencies are inferred from the claim text.