Winner: Skanska Balfour Beatty JV – M25 LUS MMALR J5-7
This alternative motorway concept tackled the issue of sustainably delivering highway improvements by using the existing highway to maximise capacity.
It allowed the team the opportunity to reassess how a motorway could be constructed, creating a development with a strong sustainable approach – one that has delivered significant savings in embodied carbon, energy use and resources.
By eliminating the need to construct an additional lane – and the extensive retaining walls that would be required to keep construction within the highway boundary – embodied carbon was reduced by 80 per cent.
This was from 5,000 tonnes per km to 1,000 tonnes per km, saving an estimated £6.8m per km completed.
“This lean approach led to a strong economic and environmental performance with faster delivery and savings returned to the customer”
The materials strategy for the scheme also played a significant part in this reduction, with all demolition material being recycled into the project alongside procurement of secondary and recycled aggregates in preference to primary and imported material.
Extensive use of a proprietary king sheet pile profile reduced steel use by 30 per cent.
This was because long piles were interspersed with shorter intermediate piles; while this was calculated to have reduced associated capital carbon by more than 80 per cent, it also resulted in faster installation and lowered costs.
“The scheme also featured a commitment to the local community that demonstrated good consultation with residents and businesses”
The use of slip-formed retaining walls in other areas – which the team said allowed for the highest extruded wall in Europe at 2.35 m – eliminated the need for a steel barrier altogether and led to a 30 per cent faster verge phase.
Collaboration with the Highways Agency, asset operator Connect Plus and asset maintainer Connect Plus Services created a working relationship that enabled the design of the scheme to influence the emerging standards for smart motorways.
It also meant lifecycle replacement works could be incorporated into the upgrade, reducing further disruption to road users.
While sustainability is a critical element of modern construction projects, this 19 km-long, £125m scheme achieved £13m of savings that were shared with the Highways Agency and was completed 22 weeks early.
Highly commended: Skanska – Brent Civic Centre
The team involved in the design and construction of the £85m Brent Civic Centre began and completed the work with a long-term vision of sustainable construction.
The result was a BREEAM Outstanding, multi-functional community hub that delivers a myriad of sustainable solutions and was not only built within budget, but will give rise to year-on-year savings for the Borough of Brent.
“One of the UK’s greenest buildings, this project was delivered with sustainability at its core using a full-time sustainability manager and looked to balance its impact with both an environmental and community focus”
The efficiency of the building was maximised through the use of natural ventilation, capitalising on natural light while reducing solar gain and maximising the use of thermal mass; however, it still requires a lot of power to function.
The solution, a combined cooling heat and power engine, runs on the least-polluting, most efficient waste product – fish oil residue – provides energy efficiency as well as an income for the client over the life of the building.
Clugston Construction Marine Walk Redevelopment Phase 2, Seaburn and Roker, Sunderland
HETCo – A Ferrovial Agroman and Laing O’Rourke JV Heathrow Terminal 2A
John Lewis Partnership Waitrose Chipping Sodbury
Keepmoat and Contour Homes St Mary’s, Oldham
Laing O’Rourke Manchester Town Hall Complex Transformation Programme
Turner & Townsend Esholt Bio Energy Project, Yorkshire Water Services
Wates Group Newport Magistrates’ Court