Mechanical installation 37
Filling the pit and finalizing the surroundings
1. If required for local frost conditions, add insulation around the column foundations.
2. Fill the hole with fine gravel with a 5 cm/m tilting angle. Leave a 15 cm air gap
underneath the megawatt station.
3. To minimise the growth of grass, use geotextile around the station. Put the geotextile
20 cm below the station and about 80 cm around the megawatt station.
4. If the foundation in not larger than the megawatt station and cannot be used as a
service platform, install two rows of 500 x 500 mm concrete tiles around all four sides
of the megawatt station. The tiles give a dry standing place for service personnel and
will prevent the removal of gravel.
WARNING! Prevent damage to the cables when you fill the pit. If it is necessary,
use wood or metal shields to provide temporary additional protection.
1 5 cm/m tilting angle for ground level
2 15 cm air gap
1
2
Tiles
Weather protection hoods
Thermal insulation
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