Walpole Substation


Project Description

Data  80 500mm bearing piles & 324 350mm bearing piles 
Client  Keltbray
Type of contract  Design and build contract
Construction period  December 2023 – January 2024

As we continue into a more technologically dependant world, the demands on the National Grid are growing. As substations across the country are upgraded, piling is needed to ensure these structures are founded with a safe and robust geotechnical solution. Across 6 weeks across the new year period, Aarsleff installed a total of 404 CFA bearing piles for a National Grid substation expansion project in Walpole, Cambridgeshire.

Working for Keltbray, Aarsleff designed and delivered a comprehensive scheme of both 500mm diameter CFA bearing piles and 350mm diameter CFA bearing piles. A large tension load requirement on the 500mm diameter piles meant that these piles were design and installed with a full depth 32mm GEWI bar into each of the 80 piles.

Following some early difficulties on site, Aarsleff were quick to engage with the client and within our own onsite team in order to assess the issues. This has meant that despite further challenges during the project, the works were delivered at tender programme. The onsite team worked hard to mitigate the issues that arose, by doubling tender production some days on site. In addition, we were able to offer the client flexibility when adverse weather caused flooding issues, delaying the start of the works.

Speaking on the scheme, Project Manager, Sam Stirrup, said, “The scheme at Walpole has been a great example of how Aarsleff’s communication and high standards of operational excellence can ensure a complicated contract can be delivered successfully. Whilst the job has not been without its issues, maintaining quick and effective communication with our client, as well as hard work put in by the operatives onsite, has meant we have been able to deliver a solution on time to our usual high standards.”

Case Study

A leading UK ground engineering specialist, focusing on multi-discipline excellence and value engineering. We design and deliver some of the UK’s largest ground engineering projects.

Our vision is to bring confidence to those constructing the landscape of tomorrow .

1947. Central Jutland, Denmark. Per Aarsleff borrowed 10,000 Danish Kroner from his father’s life insurance, bought an excavator, and founded Northern Europe’s leading contracting company.

Our biggest asset, our team is composed of the leading experts in ground engineering. Working with collaboration and cohesion at the core of our business, we can guarantee a quick and founded answer to all your questions.

We recruit and reward our people based on our ‘Step into the Blue’ company culture, where we embrace the core values of Life and Health, Trust, and Responsibility.

We do everything to ensure our team and yours work safely on our sites. With our core value of Life & Health, we see safety as a cultural pillar.

Our ISO accreditations are an assurance to you that we take governance seriously. Read our policies to discover more.

The projects that keep society running. Bridges, buildings, transit and rail facilities, embankment support, marine and offshore facilities, mines, airports, and water projects.

Keeping things turning. Sewage Treatment Works, Waste Water Treatment Works, Wind Farms and Wind Turbines, Biomass Plants, and Power stations.

Meeting society’s needs. Nursing and care homes, MOD buildings, Schools and Universities, and small or large-sized residential developments.

Staying on the move. Remediation, bridges, and foundation work are integral to keeping the industry running smoothly.

The landscape of the marketplace. Mega-retail sheds, distribution warehouses, University accommodation, and major supermarket and household name units.

Keeping things afloat. Ports and harbours, coastal defences, river embankments and inland waterways.

Technically trained estimators and a dedicated, in-house design team means we consider value-engineering at every stage of your project.

More than just a model, Visual Design & Construction is a tool to encourage collaboration and improve quality across all facets of a scheme.

From large commercial sheds to small residential plots, piling could be the foundation solution you need to support your project.

Issues around collapse, slipping or erosion? Our experts in retaining solutions have a broad portfolio of techniques designed to fix even the most nuanced of sites.

Tricky ground conditions or requirements? Aarsleff’s ground engineering team work on stabilisation through a varied range of techniques, bespoke to the properties of your site ground.

Our plant workshop offers a range of services designed to ensure your plant works for you. Whether it’s manufacturing and fabrication of equipment for long-term needs or hire so you can complete something specific.