METHOD OF PIPELINE TRENCHLESS LAYING Russian patent published in 2002 - IPC

FIELD: construction engineering, particularly, methods of trenchless laying of pipelines and other service lines under obstacles with reaming of preliminarily drilled through directed (pilot) holes. SUBSTANCE: method includes drilling of pilot hole with its subsequent reaming and pulling of pipeline through formed hole in direction opposite to that of drilling. Pilot hole bore is reamed in direction of drilling by reamers installed in end of the first string of drill pipes with adding of pipes of the second string through which torque is transmitted to reamer. Axial load is built up by the second plant located at the other end of hole, through the first drill pipes string. Pipeline is pulled through reamed hole by the second drill pipes string in direction opposite to that of drilling and reaming. EFFECT: increased rate of reaming of pilot hole. 1 dwg