Patent ID: 6902352
Filing Date: 2005-06-07
Classification: E02D

Abstract:
1. An apparatus for improving soft ground, comprising: an injection rod including an injection pipe into which fluid is introduced, and an outer casing disposed around the injection pipe with an air feeding path therebetween; one or more injection holders coupled to an outer surface of the outer casing positioned at different levels; wherein each of the injection holders includes: a tubular connecting holder coupled to the injection pipe through the outer casing; a flange disposed under a lower end of the connecting holder and having a plurality of air guide holes; a nozzle fitted in the flange; a jet guide holder having an upper space in which the nozzle fitted in the flange is received, and a drain hole having a diameter smaller than that of the space and connected to the upper space, in which a snap ring is partially embedded in an inner surface of the jet guide holder to support an upper end of the flange, with a check rubber ring disposed under the flange in the upper space, and a support cap interposed between the flange and the check rubber ring to support the check rubber ring; and a protection pipe threadedly coupled to the jet guide holder at one end of the protection pipe and coupled to the outer casing at another end; and a bit, coupled to a lower end of the injection rod, and defining jet holes, which are inclined downward and have inclined jet nozzles inserted therein, and a cutting water nozzle, provided at a center of the bit.