Contiguous piled walls are retaining systems formed by a line of closely spaced bored piles. Unlike secant piled walls, they are not fully watertight but provide excellent soil retention and stability for excavations, slopes, and infrastructure works.

We install contiguous piled retaining walls with diameters ranging from 300 mm to 1,200 mm and to depths of up to 38 m. This flexibility allows us to meet the needs of a wide range of projects.

They are widely used in building and civil engineering infrastructure projects, including:

• Retaining walls for deep excavations and cut faces
• Road and embankment retention
• Temporary and permanent excavation support systems

Contiguous piled walls are best suited where:

• Soil retention is required but full water tightness is not necessary
• Cost efficiency and speed are key drivers
• The site allows for some water seepage between piles

Our market-leading Cased CFA piling capability provides:

• Elimination of flighting risk → safer, cleaner, and more stable bores
• Ability to drill through obstructions, concrete, and medium-strong rock without delays
• Low-noise, vibration-free techniques, making the system suitable for urban or sensitive environments

We operate some of the largest CFA rigs in the UK and Ireland, capable of installing 1,200 mm piles to depths of 38 m. This allows us to handle major projects with speed, accuracy, and programme certainty.

They can be designed to:

• Stand in cantilever → effective for low to medium retained heights
• Be capped with a reinforced concrete beam and restrained with anchors → suitable for taller structures or higher load demands
• This flexibility means we can tailor designs to balance safety, performance, and cost efficiency.

Yes. We offer a full design-and-build package, including:

• Geotechnical analysis and design
• Pile installation with CFA and Cased CFA rigs
• Capping beams, anchors, and propping systems
• Ongoing quality and safety monitoring