This is for a ground engineering scheme (as a standalone project or part of a larger development) with a contract value of over £3M that stands out in terms of its credentials in innovation, sustainability, health and safety and value engineering.
The shortlist had to provide evidence that demonstrated what exceptional measures were taken to result in the project being delivered above the expected standard. A key element in deciding the winner was be the contribution of the entrant to the overall delivery of a project.
Atkins and Seaway Heavy Lifting
Beatrice Offshore Wind Farm - foundation design and installation
Overall project value £2.6bn
Geotechnical value c. £150M
beatrice wind farm (1)
When completed in 2019, Beatrice Offshore Wind Farm in the Moray Firth will be one of the deepest water wind farms in the world with water depths of up to 58m.
This combination of significant water depths, complex geology and a demanding project schedule made design, fabrication and installation of the pile foundations one of the most complex aspects of the project.
In total, 344 2.2m diameter driven steel tubular piles with penetrations up to 50m were designed, fabricated and installed for the project. The piles will support 86 jacket frame substructures for the 84 7 MW wind turbines and two offshore transformer modules on the 132km² site.
Battersea Power Station Redevelopment
Overall project value c.£8bn for all eight phases. £750M for Phase 2
Geotechnical value £30M
battersea power station
Bauer Technologies was awarded the piling works for Phase 2 (of eight) working directly for the Battersea Power Station Development Corporation. The contract involved design and construction of the rotary bored piling within the envelope of the existing the 1930’s Power Station building.
Challenges overcome by Bauer included the presence of existing foundations (including piles), headroom and space constraints, strict building movement tolerances, asbestos contamination, scour features in the London Clay, logistics management and coordinating work with both enabling and follow on contractors.
At peak, a team of over 90 employees worked day and night, five days a week to deliver the project.
The Northern Line Extension
Overall project value Unknown
Geotechnical value £33M
Northern Line extension
When completed, the project will connect the Northern Line (London Underground) to the Battersea Power Station redevelopment. Although a relatively short at 3.2km, the route includes construction of two new stations - Nine Elms and Battersea Power Station - in addition to two smaller shafts at Kennington.
Cementation Skanska was subcontracted to construct diaphragm walls and large diameter rotary bored piles for Battersea Station Box. The work comprised of the construction of 650 linear metres of 1.2m thick diaphragm walls and 74 rotary bored piles, ranging in diameter between 2.4m to 1.8m. Both diaphragm wall panels and piles were constructed up 60m depth.
Mersey Gateway Design Joint Venture (Aecom, Cowi and Eptisa)
Mersey Gateway Project
Overall project value £250M
Geotechnical value £20M
Combining expertise across the field of geotechnical engineering from within the design joint venture was critical to the project being completed on time and under budget. This included a number of innovative techniques to optimise the design for construction.
The use of shallow foundations for the main bridge pylon foundations was instrumental in achieving significant cost and programme savings while the approach to management of materials allowed the re-use of more than 1.5M.m3 of site-won soils including ground heavily impacted by contaminants including galligu, hydrocarbons and heavy metals.
Major ground engineering was required for new structures including deep soil mixing for foundations and the use of a secant piled cofferdam to create an isolated zone to mitigate the impact of piles penetrating through contaminated strata into an underlying aquifer.
Finsbury Park Phase 2B Works
Overall project value £20M
Geotechnical value £16M
finsbury park works
The Finsbury Park works included the design and construction of two new lift shafts and the extension of an existing disused passageway under the live Network Rail tracks in order to provide step-free access from ground level to the London Underground lines.
Extensive enabling works were undertaken during a series of possessions, which involved pile installation and the installation of platform and track temporary supports.
The new lift shafts were positioned between the existing Network Rail and London Underground infrastructure, which required sequential hand mining, exposing and installing temporary supports against the running London Underground platform tunnels followed by the installation of permanent works.
Bouygues and Campbellreith
University College London Hospitals UCLH Phase 4 Proton Beam Therapy project
Overall project value c. £195M
Geotechnical value £34.3M
uclh phase 4 proton beam therapy project
Proton Beam Therapy is an extremely precise form of radiotherapy and the NHS is investing £250M to build two centres - one at UCLH - five storeys below ground in a 28.5m deep basement.
The L-shaped, 87m by 67m basement is big enough to contain the Albert Hall and deeper than the Central line. In total 78 1m thick diaphragm wall panels to depths ranging from 33m to 36m form the permanent retaining structure supported by 1150t of steel propping over three levels.
Not only is the ground highly congested, there was also a complex faulted geology and the need to restrict long-term differential movement to 1:5000, which was addressed by a 2m thick raft and tension piles.