King Sheet Piling (KSP) was first used in 2009 on this prestigious, high-profile and fast-track project to widen 63 km of motorway in the northern sector of the M25 London Orbital Motorway. Introduced without prior trial, it proved a resounding success, with over 25km of KSP wall forming part of Europe’s largest land-based use of sheet piling. Steel saving of 35% to 40% was typical. The KSP installation speed was key to the project opening 3 months early and helped deliver KSP savings of over £10M, shared equally with the Highways Agency.
Incorporation of KSP in 2009/2010 in the re-design of a pumping station saved £800k and avoided a projected 3 month programme over-run, resulting in savings of £2.7m for Client, The Highways Agency.
KSP’s versatility was proven in 2011/2012 by use in weak rock where sheet piles would normally be rejected. It saved valuable vegetation screening, enhanced safety and was built in 1/3 the time of a gabion alternative.
KSP was used to great success in stabilising a railway embankment for Network Rail, saving 41% of steel and more than halving noise for nearby residents.
May 2023: KSP walls are due to start shortly for slope stabilisation on both rail and highway applications, taking advantage of the important benefit that KSP facilitates groundwater flow.
2022: Saw completion of further KSP walls on the M1, M45 and M56 motorways.
31 August 2021: Correct Link to Technical Guidance Download reinstated (inadvertently re-directed in website upgrade of 28 July 2021).
July 2021: Installation of the last KSP wall on M4 Junctions 3 – 12 Smart Motorway marked completion of many kilometres of Smart Motorway KSP walls across the Highways England network. KSP walls are currently being designed for further schemes under the Smart Motorway Alliance programme.
2020 saw completion of substantial anchored and cantilever KSP walls for Langport Embankment for Network Rail, following on from those on Bridgewater rail embankment in 2019. KSP walls completed or in progress for Highways England include M23 J8-10, M1 J13-16, M4 J3-12, M25 EAs 01 & 06 and A19 Norton to Wynyard. Further KSP walls are envisaged on Highways England SMA schemes currently in the design phase.