Patent ID: 6357968
Filing Date: 2002-03-19
Classification: E02D

Abstract:
A jet grout injector subassembly, comprising:a hollow cylinder comprising an open upper end, a closed lower end, a wall, and a longitudinal axis; exactly six jet spray nozzles penetrating said wall of said cylinder, for spraying slurry from said hollow cylinder in a radially outward direction, said direction being oriented substantially perpendicular to said longitudinal axis; wherein said six jet spray nozzles further comprise: a pair of primary nozzles, having an inside nozzle diameter equal to Dp; four secondary nozzles, having an inside nozzle diameter equal to Ds; wherein Dp is larger than Ds; and wherein said pair of primary nozzles further comprise:a first primary nozzle that penetrates said wall at a circumferential angle equal to zero degrees; and a second primary nozzle that penetrates said wall at a circumferential angle approximately equal to 180 degrees; and wherein said four secondary nozzles further comprise:a first secondary nozzle that penetrates said wall at a circumferential angle &thgr; approximately equal to &thgr;offset; a second secondary nozzle that penetrates said wall at a circumferential angle &thgr; approximately equal to âˆ’&thgr;offset; a third secondary nozzle that penetrates said wall at a circumferential angle &thgr; approximately equal to 180+&thgr;offset; and a fourth secondary nozzle that penetrates said wall at a circumferential angle &thgr; approximately equal to 180âˆ’&thgr;offset; and wherein said circumferential offset angle, &thgr;offset, has a value between about 20 and 40 degrees.