Abstract: A ground piercing pipe tool for carrying and depositing pipes of different inner diameter under a ground surface, comprising a ground piercing tip and impact-receiving end cap respectively connected to forward and rear ends of a rod and characterized by at least one of the tip and end cap being releasably connected to the rod so as to allow the pipes to receive the rod and further characterized by the tip and end cap having radially spaced outer supports dimensioned to engage inner surfaces of different ones of the pipes at tip and end cap ends thereof and to longitudinally support the pipes on the rod for selective deposit under the ground surface upon removal of one of the tip or end cap.

Abstract: A method and apparatus employing an axially elongated ground piercing tool for forming an in-ground tunnel under a surface structure with forward axial movement of the tool in the ground under the structure with a pipe carried by the tool for depositing in the tunnel after a removal of a tip of the tool and a rearward pulling of the remainder of the tool from the tunnel.

Abstract: An earth piercing apparatus comprising a metal drive tool having a pointed forward end and an axially extending cavity at a rear end. The cavity includes a forward chamber and a female thread in an inner wall of the cavity adjacent the chamber for receiving a forward end of a driving rod having a male nesting end engaging a laterally extending stop surface in the chamber and a male thread mating with the female thread in the cavity. An end of the rod remote from the drive tool forms a driving end for receiving axial impulses for propelling the apparatus in a forward direction through soil to form a uniform hole in the soil.