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Drainage is often a satisfactory solution for stabilizing landslides.
It is usually done by digging a network of ditches or by drilling drain-holes.
Drainage ditches have the advantage that they systematically capture every single ingress of water but they are limited to a few metres depth.
Sub-horizontal drains capture incidental arrivals of water but in a random manner.
The drainage trench using biodegradable mud and placed upstream or in a landslide provides continuous capture, like the classic drainage trench, but at larger depth (deeper than 20 m on some civil works completed as of today).
The traditional drainage trench is constructed by excavating and backfilling with gravel successive panel elements which are connected together as the site moves onward. To achieve this, a temporary shuttering is placed at the end of Panel N when excavation is completed, enabling the filling of Panel N. This is then used to retain Panel N while Panel N + 1 is excavated.
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Trench Grates
The Webforge range of AS3996 strength class compliant fabricated trench grates provides the following benefits:
- Extended life from hot dip galvanising.
-High hydraulic efficiencies due to maximum waterway created by narrow load bars.
- Bicycle and pedestrian safety due to cross rods at 100mm centres.
- Simple speedy installation as the 2m long torsionally rigid frame can be cast in with grates removed.
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