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10.5 Concrete installation:
A concrete surround must be installed in wet site conditions and sites where the inlet invert is between
810mm and 1310mm (plants with 500mm and 750mm risers).
A wet site is one where the water table may rise higher than the base of the Tricel
Duos tank.
The option of a reinforced concrete slab or deadman anchor may also be used. This should be designed by an
on-site structural engineer to suit site conditions.
10.5.1Tank base/plinth:
•
Remove any soft spots or large stones and boulders.
•
The base is constructed of a 50mm layer of suitably compacted gravel, covered with a
250mm layer of semi dry concrete. Refer to 10.6.2
•
Ensure that base is level and at the correct height to accommodate the incoming pipe work.
•
It is important to maintain a completely dry excavation until the final pour of concrete is set. It
may be necessary to line the excavation with a continuous layer of 1200 gauge polythene to
maintain the integrity of the concrete.
10.5.2 Installing onto the base/plinth:
•
Mechanically lift the plant carefully into the center of the hole before the concrete sets.
•
The plant must be dead level on the plinth.
•
Connect and seal the pipe work to the tank appropriately.
