RJS Piling recently completed a complex closed‑cofferdam installation involving 274nr 7 m GU16N sheet piles, utilising a combination of Augar Torque drilling technology and the Movax SG75V side‑grip vibratory hammer. This project showcases the accuracy, efficiency, and engineering capability required to deliver high‑performance temporary works in challenging ground conditions.

Why GU16N Sheet Piles Were Selected

  • High structural capacity — ideal for resisting earth and water pressures within a closed cofferdam.
  • Interlock reliability — GU16N piles provide tight, consistent interlocks, essential for water control.
  • Versatility — suitable for both temporary and permanent works where stability is critical.

These characteristics made GU16N the optimal choice for forming a robust, fully enclosed cofferdam structure.

Our Installation Method: Augar Torque + Movax SG75V

Augar Torque Drill: Controlled Pre‑Augering

Ground conditions demanded pre‑augering to:

  • Reduce refusal during pile driving
  • Minimise vibration transfer to nearby assets
  • Create a clean, consistent path for each 7 m pile

The Augar Torque drill allowed RJS Piling to pre‑drill to precise depths, ensuring every pile could be installed smoothly and accurately.

Movax SG75V: High‑Efficiency Vibratory Installation

Once pre‑augered, piles were driven using the Movax SG75V, chosen for:

  • Fast installation rates
  • Exceptional accuracy with real‑time verticality control
  • Safe handling of long, heavy GU16N piles
  • Reduced noise and vibration compared to traditional impact hammers

The synergy between the Augar Torque and Movax SG75V meant RJS Piling could maintain tight tolerances across all 274 sheet piles, ensuring a perfectly aligned cofferdam.

Forming the Closed Cofferdam

The completed cofferdam delivered:

  • Full perimeter stability
  • Secure water exclusion
  • Safe working conditions for excavation and construction
  • A durable temporary works solution ready for follow‑on contractors

Every pile was installed to specification, interlocks sealed, and the structure completed ahead of programme.

Why Choose RJS Piling for Cofferdam & Sheet‑Piling Works?

  • Specialist operators trained on Movax and Augar Torque systems
  • Proven track record in cofferdams, retaining walls, and deep excavations
  • Ability to work in restricted access, sensitive environments, and complex ground conditions
  • Commitment to safety, precision, and programme certainty

RJS Piling continues to support contractors across the UK with reliable, high‑quality piling solutions tailored to each project’s engineering demands.

Ready to Discuss Your Project?

If you need expert support with sheet piling, cofferdam construction, or specialist piling plant, RJS Piling can help.