| 摘要 |
FIELD: building and irrigation and drainage construction, for agricultural land, underground building parts, roads, and slopes reclamation. ^ SUBSTANCE: drainage system comprises perforated drainage pipe connected to drain web having extensions, filtering diaphragm and thickened parts in joint areas. The thickened parts are provided with through orifices for bolts receiving. Nuts are screwed on the bolts. Drainage pipe has horizontal slot with bent upwards ends in which drain web in installed. ^ EFFECT: improved draining efficiency and increased speed of excessive water draining from ground. ^ 2 dwg |
