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This substation was required to provide a connection to the 400kV lines for the Vattenfall windfarm.
Churngold were contracted to design and construct an engineered plateau in order to meet the stringent design settlement criteria due to the sensitive nature of the copper earth matt. National Grid required no more than 75mm global settlement throughout the 9m of engineered fill and no more than 25mm differential settlement between foundations.
Churngold used their extensive earthworks experience together with their long term relationship with Arup to design and deliver a solution for the plateau.
Design difficulties:
90,000m3 hazardous waste
Heavily contaminated groundwater
60,000m3 of tipped peat
25,000m3 deep peat layers
The solution involved the following:
15,000m3 Peat extraction
100,000m3 lime stabilisation
100,000m3 crushing and screening
2,500 no. driven cast in-situ piles
45,000m2 Load transfer platform
90,000m2 Naue geogrid
75,000m3 high level peat excavation
3D GPS machine control
