| 摘要 |
PURPOSE:To permit blind draining to be performed effectively without clogging by a method in which bundles of S-shaped synthetic resin troughs each having a coupling projection on its outside are connected and buried underground. CONSTITUTION:Two water cavities 6 and 7 are formed adjacently by rolling up both ends of the central walls 5 in mutually opposite directions and water inlets 8 and 9 are formed between the rolled end and the central wall 5. Coupling projections 12, 13, 14, and 15 are provided for the periphery to form a synthetic resin trough 2. A number of the troughs 2 are bound with binder 3 and buried underground. Blind draining in the ground can thus be performed without clogging.
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