Welcome to Clancy Docwra

Smarter, greener infrastructure reimagined

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Our Vision

In May 2015 we launched our ‘Vision 2020’. We believe that our mission, values and vision statements are the fundamental ingredients that bind our business and keep us focused on delivering an excellent service to our clients.

Our Vision

We believe that our mission, values and vision statements are the fundamental ingredients that bind our business and keep us focused on delivering an excellent service to our clients.

News Stories

Want to know the latest news at The Clancy Group? Read through our news stories to find out what we’ve been up to.

Our People

We are a people based business which values and invests in its staff. Our people are the most important asset we have, and our aim is to provide them with ongoing development for the long term benefit of the business – in keeping with every aspect of our Vision 2020.

Careers

Our purpose at Clancy is simple – we make life better for everyone’s growing families. We play a vital role in providing fresh drinking water and power to millions of homes and businesses, as well as energy connections to vital transport infrastructure.

News

Want to know the latest news at Clancy Docwra? Read through our news stories to find out what we’ve been up to.

Clancy Cares

By creating a responsible and profitable business that contributes to a good society our company’s principles, and our commitments to being a sustainable business, have been embedded in our corporate Vision, Mission, Policies and Values.

Our Services

We provide a broad range of expertise and serve multiple sectors ranging from the water sector where we have recently secured a £700M order book, to complex civil engineering projects and large frameworks.

Furthermore, we are a leading provider of multi utility services, rail services, energy and more recently renewables, where we are leading two ground-breaking district heating projects that are shaping the way we recycle and distribute energy.

Our Company

Clancy is one of the largest privately owned construction firms in the UK. With over sixty years’ experience and a workforce of over 2500, we have worked hard to develop a reputation as a well run business that you can trust to deliver value for money, essential services that help keep the UK running.

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Digging deep at Battersea

Battersea Power Station shut down in 1983. Now the iconic landmark is being resurrected and repurposed as the centrepiece of an exciting regeneration of London’s Nine Elms. With energy demand rapidly rising from an array of new homes and workplaces, UK Power Networks turned to its ED1SON ALLIANCE to deliver a complex electricity connection.

Transforming Nine Elms and sparking new life into Battersea Power Station has created one of the largest development zones in the country on London’s south bank.

While the apartments and offices being built have captured the public imagination, successful regeneration relies on power. Additional demand of 110MVA is expected over the next few years, equivalent to the energy required for more than 25,000 homes.

Increasing capacity on this scale called for a major new electricity network connection and substation. UK Power Networks – the distribution network operator with responsibility for the connection – drew on the expertise of its ED1SON contracting alliance to deliver the complex project above and below the streets of London.

Through UK Power Networks’ Alliance team, Clancy worked alongside tunnelling subcontractor Joseph Gallagher and specialist consultant Cowi on the challenging scheme – overcoming a number of obstacles to construct a new 320m cable tunnel beneath central London.

This included navigating centuries of the city’s unseen history. The tunnel needed to avoid a maze of sub-surface pipes and infrastructure including a Victorian brick trunk sewer just 12m above the proposed route and two rail viaducts only 10m away. Before any digging started, complex computer modelling took place to refine the route and avoid any collisions.

Martin McGovern, associate director at Clancy, said: “Maintaining power throughout was a key consideration. The team’s innovative approach made the Battersea Cable Tunnel project the first time that UK Power Networks had been able to extend a tunnel network without needing any power outages.”

The new 2.44m wide spur tunnel had to connect with the existing live cable tunnel, creating a considerable engineering challenge. Working in the proximity of 132kV cables required precise technical coordination to ensure the safety of the team and to keep the lights on.

The team’s solution was developing a junction chamber below ground from reinforced concrete. A compact and carefully built 9m by 6m by 6m box housed both the new connection and the old one, acting as a link between them.

Crucially, additional support was added to the existing tunnel to prevent any movement during the construction of the junction room. Health and safety remained a key consideration within the restricted environment, with close attention to detail and regular team briefings contributing to more than 180,000 hours worked without injury.

While activity continued apace underground, on the surface the team was equally busy working on the new substation. An existing warehouse was used to shield construction activity with the tunnel shaft located inside. This was specially modified to act as an acoustic barrier to minimise disruption for the local community.

The team’s determination to be a considerate neighbour ensured that no complaints were received throughout the project’s duration, despite the site being active 24/7.

While most of the activity was deliberately hidden from view, the team used the project to shine a light on the complexities and rewards of modern construction for budding engineers.  A visit to the local Oasis Academy South Bank secondary school saw the Tunnel Boring Machine christened ‘Maggie’, in honour of the prominent space scientist Maggie-Aderin Pocock.

Martin said: “Maggie spent 11 weeks boring through over 300m of London clay to stop just 4m away from the existing network to allow for the construction of the junction chamber. Forward planning meant that we were able to recycle 95% of the waste material generated by the tunnelling.”

The ED1SON Alliance

The ED1SON Alliance was launched by UK Power Networks in 2015 as a ground-breaking new model for delivering a £1billion investment in energy infrastructure across London, the East and the South East of England.

It brings together the skills of contractors and consultants within a continuous work programme – ensuring greater efficiency and innovation which brings value to UK Power Networks’ customers.

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  •  - Clancy Docwra