Method of accurate trenchless installation of underground pipe

A process for the installation of a trenchless underground product pipe from a first location to a second location at a predetermined depth, comprising:

• digging a first access shaft at the first location and a target access shaft at the second location to the determined depths;
• installing a pipe displacement machine in the first access shaft;
• jacking a steerable pilot tube and additional pilot tube sections below grade at the predetermined depth into the ground from the first access shaft to the target shaft displacing the soil about the pilot tubes to form pilot pipe from the first access shaft to the target shaft;
• installing a drill string from above ground at a distance from the first access shaft to replace the pilot pipe;
• continuing the installation of the drill string through the target shaft to exit the ground at an exit opening a distance from the target shaft;
• attaching a back reamer of a first diameter to the drill string on the surface a distance from the target shaft;
• pulling the back reamer from the exit opening to the target shaft and to the first access shaft;
• and
• filling in the bore formed between the target shaft and the surface exit opening.

A process for the trenchless installation of an underground product pipe from a first location to a second location at a predetermined depth, comprising:

• digging a first access shaft at the first location and a target access shaft at the second location to the predetermined depth;
• installing a pipe displacement machine in the first access shaft;
• jacking a steerable pilot tube and additional pilot tube sections into below ground at the predetermined depth the ground from the first access shaft to the target shaft displacing the soil to form a pilot pipe from the first access shaft to the target shaft;
• installing a drill string from above ground to replace the pilot pipe;
• positioning a horizontal drilling machine a distance of about 15 feet from the first access opening for each 5 feet for each foot the pilot pipe is below the surface.
• attaching a back reamer of a first diameter to the drill string at the target shaft;
• pulling the back reamer from the target shaft to the first access shaft;
• attaching a product pipe coupled to the back side of the back reamer;
• and
• pulling the back reamer and product pipe from the target shaft to the first access shaft.

A process for the trenchless underground product pipe from a first location to a second location at a predetermined depth, comprising:

• digging a first access shaft at the first location and a target access shaft at the second location to the determined depths;
• installing a pipe displacement machine in the first access shaft;
• jacking a steerable pilot tube and additional pilot tube sections below ground at the predetermined depth into the ground from the first access shaft to the target shaft displacing the soil about the pilot tubes to form pilot pipe from the first access shaft to the target shaft;
• installing a drill string from above ground at a distance from the first access shaft to replace the pilot pipe;
• continuing the installation of the drill string through the target shaft to exit the ground at an exit opening a distance from the target shaft;
• positioning a horizontal direction drilling machine a distance of about 15 feet from the first access shaft for each 5 feet for each foot that the pilot pipe is below the surface;
• attaching a back reamer of a first diameter to the drill string at the surface a distance from the target shaft;
• pulling the back reamer from the exit opening to the target shaft and to the first access shaft;
• attaching a product pipe to the back side of a back reamer;
• pulling the back reamer and product pipe from the target shaft to the first access shaft;
• and
• filling in the bore formed between the target shaft and the surface exit opening.