PROCESS AND TOOL FOR LAYING UNDERGROUND COLLECTOR MAINS FOR LIQUIDS AND GASES

摘要

In order to draw-in underground collector mains, in particular to build horizontal filtering wells and drainage pipes, at least one bore (1) with an inlet (3) and an outlet (4) is made in predetermined soil layers. A filtering column drawing-in unit (5) which consists of an inner filtering column and of an outer enveloping pipe is drawn into the bore (1) and the outer enveloping pipe of the filtering column drawing-in unit (5) is then removed. A filtering column drawing-in unit which consists of an inner filtering column and an outer enveloping pipe is used as a tool for carrying out the process. In a preferred development of the invention, the intermediate space between the inner filtering column and the outer enveloping pipe is filled with filtering sand and/or gravel.