DRAINAGE PIPE Russian patent published in 2003 - IPC

FIELD: construction of closed collection-drainage systems and underground service lines in water-logged grounds. SUBSTANCE: drainage pipe is made of separate small pipes combined into continuous pipe and wrapped around with filter medium. Separate pipes consist of polymer transverse circular members with holes over diameter and longitudinal plate members with holes in center and two slots at ends. Transverse circular members and longitudinal plate members are interconnected by pins with heads and fixing stops. Pins are installed in holes of transverse circular members through slots in longitudinal plate members for motion of transverse circular members and longitudinal plate members relative to each other, and also trough holes in centers of longitudinal plate members. EFFECT: higher efficiency of drainage operations due to increased drain water permeability, reduced expenditures for manufacture and transportation of drainage pipes, and reduced labor input in laying of drainage. 4 dwg