Retaining Walls

King Sheet Piling (KSP®) can be used for any retaining wall where the pile section chosen is governed by driveability and hence surplus structural capacity is available in bending. Shear is not normally a controlling factor. KSP walls can normally replace cantilever sheet pile walls, up to 4m high, sized for driving in typical UK soils. In low retained height walls in soft ground requiring only a light section, there may still be sufficient spare capacity for savings to be made using the KSP approach. Retaining walls designed in reinforced concrete may be more economical as KSP walls.

Environment Agency (EA) Groundwater-Flow Compliance

The EA often impose restrictions on retaining walls by stipulating that the wall should not impede groundwater flow across the line of a wall. KSP is ideal for satisfying this requirement.

Water Retention / Cut-off

Typically, KSP walls are used where groundwater is not a design issue. A KSP wall can also be used to advantage where a cut-off is required, either by lengthening the intermediates sufficiently to form a seal into a deeper, impervious layer or by using KSP in conjunction with another form of cut-off. This can be achieved by:

  • Constructing a KSP wall along the line of a pre-formed cement-bentonite cut-off wall.
  • Using a purpose-made mandrel to form a thin Vib-Wall type cut-off (see Technical Download for more detail).

Flood Protection and Beach Erosion Barriers

KSP walls are ideal for flood protection or beach erosion walls in ground where there is not a problem of significant seepage flow beneath the intermediates. KSP can produce an economical and rapidly installed flood protection wall in these circumstances. Potential concerns over erosion or scour to beneath the intermediates are easily satisfied (see Technical Guidance download).

Culvert and Pipeline Support in Compressible Alluvium

KSP can be used as combined temporary works and permanent works support for culverts in compressible alluvium. Propped or tied-back KSP walls provide the temporary support during construction. Shear studs or equivalent are welded to the kings to transfer net vertical load from the reinforced concrete culvert to the kings, avoiding the need to pile the culvert.

Other variations include:

  • KSP walls for the permanent side walls with a roof slab bearing on the walls and either a stone mattress bed or a lightly reinforced concrete bed .
  • Support for large pipelines through compressible alluvium with the KSP providing temporary support for the trench and the pipe hung off the kings.

Basements, Underground Car Parks and Pumping Stations

Basements, underground car parks or pumping stations that can be sheet piled are ideally suited to KSP, particularly where vibration-free pressing is used as this typically requires use of larger sections. The intermediates can extend to just below basement slab formation level with the KSP wall functioning as the permanent wall, with clutches welded for water-tightness. Alternatively, the intermediates can be taken down sufficiently to form a cut-off into low permeability strata, e.g. London Clay beneath Terrace Gravels. Other forms of permanent support can be provided for the clay between the kings and a false wall and seepage collection provided, as is often done with secant pile walls.

Road and Railway Widening or Improvement

The greatly enhanced speed of installation is a major benefit in forming retaining walls for existing infrastructure in constrained working conditions. This especially applies to the rail environment, where possession time is crucial.

Bridge Abutments

KSP walls for bridge abutments form an economic alternative to traditional abutments when cost, simplicity and speed of installation are taken into account.

Contact Us

To find out how you can use a KSP wall on your project, see Guidance to Users. Contact for more information.

Latest News

12 April 2019: The Indian IPO issued Patent 311168 covering the intellectual property rights behind KSP.

19 December 2018: The European Patent Office today issued Patent No 2326773 covering the intellectual property behind King Sheet Piling (KSP). The patent is effective in Belgium, France, Germany, The Netherlands and the UK.

18 April 2018: February saw the start of KSP installation on the A14 Ellington to Fen Ditton highway project. Planned other UK Smart Motorway work this year using KSP walls includes the M1 Jnct 23A-25, M6 Jnct 2-4, M4, Jnct 3-12, M1, J13-16 and M23 Jnct 8-10. Last summer saw completion of KSP walls on M1 Jnct 19-16, M25 Jnct 30 Improvement and M5 Jnct 4A-6.

31st January 2018: The Canadian IPO granted patent 2 732 905 covering the intellectual property rights behind KSP.