DRAIN MATERIAL AND ITS MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To provide a drain material which can be installed in the ground without making a ground surface dug up and which combines sufficient strength against earth pressure with the property of properly discharging redundant water etc., and drain material which can easily recover a discharge function decreased due to clogging caused after being installed in the ground. SOLUTION: This drain material 1 comprises: a composite pipelike body 4 which is equipped with a flexible tubular body 2 for injecting a filler, and a plurality of pipelike bodies 3 arranged along an outer periphery of the tubular body 2, having pipe walls provided with many through-holes 3a and having shape retention; a tubular cover member 5 for covering an outer surface of the composite pipelike body 4; and a linear body 6 which is wound along an outer surface of the cover member 5. COPYRIGHT: (C)2005,JPO&NCIPI