| 摘要 |
<p>The present invention relates to a permanent underground drainage system and a construction method for the same and, specifically, to a permanent underground drainage system and a construction method for the same to reduce construction costs including component and material costs and to permanently improve underground water drainage and catchment performance by joining a perforated drainpipe functioning as a collecting pipe to an imperforated drainpipe functioning as a drain pipe. For this, the present invention comprises a plurality of perforated drainpipes integrated with inner and outer collecting pipes into a double pipe structure; non-woven fabric to cover the surface of the perforated drainpipes; the imperforated drainpipe functioning as a drain pipe in a space between the perforated drainpipes to connect the perforated drainpipes to each other; an imperforated induction pipe between the imperforated drainpipes to send water to a collecting area; an imperforated water pipe at greater diameter than the imperforated and perforated pipes to function as a collecting pipe and to be connected to the tip end of the induction pipe in the side of a foundation formation level; and a collecting well connected to the tip end of the water pipe around the edge of the foundation formation level at a predetermined volume.</p> |
