| 摘要 |
<p>The system is used to provide adequate drainage where water under pressure occurs as a result of a non-permeable rock layer parallel to a slope. The connection with drainpipe, laid in the ground, for water ducting is formed by a drainage plate or slab. At one end, the slab (6) has a form locking element, which partially envelops the drainpipe (5). The slab is pref. wedge- shaped in cross-section, and has a semicircular groove, used as a form locking element on its wider bottom end face. This provides secure water-ducting connection with the drainpipe, and can remain upright until the trench is finally filled.</p> |
