METHOD LAYING UNDERGROUND PIPE LINE Russian patent published in 1997 - IPC

FIELD: erection of underground pipe lines at slopes of route. SUBSTANCE: in laying the underground pipe line, longitudinal channels are dug on bottom of trench and are covered with watertight sheet material over perimeter, then channels are filled with filtering material and trench is covered with watertight mat together with pipe line laid in it, wells are filled and backfill is covered with side parts of mat. EFFECT: enhanced reliability. 5 cl, 1 dwg