ABB PVS800-IS, Руководство по оборудованию, Страница: 26 / 68

When selecting the columns, check the load carrying capacity of the ground and potential
local special requirements (for example, earthquake or typhoon anchoring) of the construction
area. Use columns suitable for the local conditions and requirements.
The following picture shows an example of a concrete column foundation suitable for 100
kPa ground load carrying capacity.
200
m
m
80
0 m
m
50
m
m
3
1
2
Column 200 x 200 mm 1
Dia 8 x 150 x 150 mm steel reinforcement 2
Base 600 x 600 mm 3
Start by making a deep enough hole for the foundation. Always dig down to a frost proof
depth and drain the hole. If needed, connect the foundation hole to the general drainage
network or lead drainage pipes to a well-drained terrain where the water does not cause
harm.
Construct proper support for the inverter station:
• On sandy soil: Gravel is usually enough below the column foundations. Fill the foundation
hole with gravel according to normal construction practices. Use geotextile to prevent
mixing of fill gravel with the surrounding soil. Start by filling with crushed stone or coarse
gravel, and continue with finer material. Compress the filling. Use fine gravel (size 2 -
5 mm) for the surface layer below the column foundations. Smooth and compress the
surface before adding or molding the column foundations.
• On non-sandy soil: Follow the same practices as for sandy soil. Depending on frost
sensitivity and loading capacity of base soil, you may need to add a thicker layer of
gravel below the column foundations and/or to use foundations with a larger surface
area. Add insulation around the column foundations if there is a risk of frost.
26 Mechanical installation