turbulence phenomena induced helix folds with a cross intersection of spiral and straight perforated drain boards

摘要

A cylindrical spiral corrugated and perforated drain member having a cross intersection of a spiral line and a straight light generating turbulence is provided to make the water discharge flow velocity fast and to secure high water permeability by the turbulence generated in the cross intersection where a spiral line and a straight light cross each other. The cylindrical spiral corrugated and perforated drain member(8,11) has an upward cross intersection formed like an endless track by crossing a spiral line with the angle of 25~80 degrees and 2~8 split straight lines symmetrical to a circumference or asymmetrical straight lines across each other. A reinforcing groove is formed to prevent the shape deformation of the structure. The perforated drain member has strong resisting power against transverse and lateral pressure generated due to soil pressure after the perforated drain member is vertically buried under the ground.