Screw pile foundations | Substation | UK | RADIX

Substation on Screw Pile Foundations, Chalky Ground Conditions, Salisbury

Supply and installation of screw pile foundations through an existing concrete pad for a 400KV substation in Salisbury, UK.


Salisbury, UK

400KV Substation

Renewable Energy

Screw Piling | Foundations for substation | England


Facing chalky ground conditions

RADIX was approached to assist in the renovation and improvement works being undertaken at Chalk Pit, a 400KV substation in Salisbury.

The area had been excavated, but due to the chalky ground conditions, a screw piling solution would be required to provide additional support for the units. Our helical screw piles were the better choice compared to our ground screw for this project.

The team completed a site survey and testing, verifying the suitability of ground conditions and ensuring the correct specification of RADIX Extendable Screw Piles were installed to provide the support necessary.

As the ground was light/hard chalk, a point load test was completed to confirm load capacity at 90 kN. This was sufficient, as between 30kN and 70kN kN were required per screw.

Screw Piles | Foundations for a substation in England


Substation on screw pile foundations

As indicated by the site survey and ground testing, the team supplied and installed screw piles in six locations, including:

  • 9 screw piles for three post-insulator areas
  • 4 screw piles for one circuit breaker
  • 20 screw piles for two disconnector areas
  • 10 screw piles for one voltage transformer
  • 10 screw piles for a cable sealing end
  • 7 screw piles for the CT area

Screw Pile Foundations: Quick to install, cost-effective and highly efficient

A total of 60 screw piles were installed across the site and to depths over 3 meters.

The screw pile foundations for the 400KV substation were completed by the team in only 3 days. RADIX has now become the industry leader in supplying screw pile foundations for energy related projects, including BESS and solar farms throughout the UK. Learn more about the advantages of ground screws and screw piles, and the differences between screw piles vs concrete foundations.