Soil stabilization

Claim 1

Apparatus for use in delivering fluid stabilizing material to subsurface soil under pressure with minimal return to surface of the fluid stabilizing material along the path of the apparatus, comprising elongate conduit means of uniform outer diameter throughout its length without any inward depressions or outward projections along its length whereby it may be driven longitudinally into the ground without disturbing the walls of its penetration path, head means at the upper end of said conduit means having a fluid flow inlet communicating with the interior of said conduit means, said inlet having connection means for connection of said inlet to a separate conduit, tip means at the lower end of said conduit means having a cylindrical upper portion of the same outer diameter as said conduit means and a downwardly diminishing conical portion therebelow terminating downwardly in a pointed tip, the exterior of said lower end of said conduit means at the junction therebetween and said tip means having smoothly reduced to said pointed tip, said tip means having passage means extending longitudinally therethrough downwardly from said junction terminating above said pointed tip and having at least one laterally disposed fluid outlet port extending from the lower end of said passage to exit at a reduced portion of said tip means, whereby when said tip means and conduit means are driven into the ground the soil through which the same are driven is compressed outwardly by downward movement of the reduced portions of said tip means to form an uninterrupted annular ring of compressed soil around said upper portion of tip means and around said conduit means above said outlet ports and thereby forming a seal around said apparatus to prevent flow of fluid stabilizing material injected from said outlet ports into the soil upwardly around said.