Foundation for substation equipment
Foundation for substation equipment
(OP)
I am looking for some literature references which can assist with the design of large block foundations for various heavy equipment in substations (eg 11000 kg Transformer). As the loads on the foundation are static and the base area is large, bearing pressures under the base are not normally an issue. What I am looking for is, information on specifically is how deep should one make the concrete block and what should this be based on. Many existing drawing is have looked at show concrete blocks 0.8m-1.0m deep, this appears to be very conservative.
Thanks
Thanks





RE: Foundation for substation equipment
RE: Foundation for substation equipment
RE: Foundation for substation equipment
Dik
RE: Foundation for substation equipment
RE: Foundation for substation equipment
RE: Foundation for substation equipment
I believe the vibrations may have some effects on the soil, that is to decrease the static subgrade modulus, usually not too much but in some conditions (soil layer resonance) by a significant amount.
RE: Foundation for substation equipment
Dik
RE: Foundation for substation equipment
The degradation of the subgrade modulus is higher for higher angular frequencies such as those involved in alternate power generation. According to the models, degradation would be in the range of about 75% to 95% of the original value, for some ideal and realistic conditions of foundation geometry and soil rigidity. Intensity of the vibrations does not appear in the equations, a linear stress-strain relationship is assumed.
Of course, a layer of loose sands may be subject to significant densification and settlements but that is so obvious that probably nobody would build vibrating machinery on it, I hope.
RE: Foundation for substation equipment
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin
RE: Foundation for substation equipment
Dik
RE: Foundation for substation equipment
Michael.
"Science adjusts its views based on what's observed. Faith is the denial of observation so that belief can be preserved." ~ Tim Minchin