The Cliffs Palisade Strengthening

Protecting the ground we stand on.

Project Overview

Client Nelson City Council

Location The Cliffs, Nelson

Service Structures & Ground Stabilisation

Project Value $435,000

Duration Completed June 2018

Completed 2018

• At a Glance

  • Palisade retaining wall strengthening

  • Rock anchors, concrete piles and ground beams

  • Structural remediation of existing infrastructure

  • Traffic and pedestrian management

  • Urban construction alongside private property

  • Delivered on programme and to a high quality

• The Challenge

  The Cliffs Palisade Strengthening project was undertaken to reinforce an existing retaining structure, protecting both the surrounding transport corridor and adjacent land from future ground movement.

  Working on an existing structural asset required far more than constructing new infrastructure. The project demanded careful integration of additional concrete piles, rock anchors and reinforced ground beams into the existing retaining system while maintaining public safety, protecting neighbouring properties and minimising disruption to road users throughout construction.

  The project presented far more than a conventional pipeline installation. The proposed alignment crossed an operational school, a former landfill site, busy public roads, recreational facilities and existing underground services. The original construction methodology also relied on long directional drill installations, introducing significant technical, financial and programme risk before construction had even begun.

• What Mattered

  Strengthening an existing structure leaves little room for compromise.

  Every new structural element needed to perform seamlessly with the original retaining system, while construction activities had to be carefully managed within a constrained urban environment. Maintaining safe access for pedestrians and vehicles, coordinating specialist subcontractors and protecting nearby residents all contributed to the successful delivery of the project.

• Our Approach

  Tasman Civil worked collaboratively with Nelson City Council and project consultants to deliver a carefully sequenced strengthening programme that balanced structural integrity with efficient construction. The works included installation of additional concrete piles, rock anchors and reinforced concrete ground beams, supported by precise surveying and quality control throughout each stage of construction.

  Traffic management, reinstatement and stakeholder communication were integrated into the delivery programme from the outset, ensuring the project could proceed safely while minimising disruption to the surrounding community. Close coordination between specialist contractors enabled structural works to progress efficiently without compromising quality or programme.

  With experienced project management and disciplined site supervision, Tasman Civil delivered a strengthening solution that not only addressed the immediate structural requirements but also enhanced the long-term resilience of this important public asset.

  That collaborative mindset continued throughout delivery. A shared Project Charter aligned the client, consultant and contractor around common objectives, while regular site meetings, team workshops and open communication ensured decisions could be made quickly and confidently as the project evolved.

  Technically, the works demanded precise management of deep excavations, dewatering, service crossings and polyethylene pipeline construction. Every PE butt weld and electrofusion weld passed quality assurance testing first time, allowing the full 1.6-kilometre pipeline to be pressure tested successfully as a single installation before commissioning.

• The Outcome

  The completed strengthening works have extended the service life of the existing retaining structure, providing greater stability and resilience while protecting the surrounding transport corridor and adjacent properties.

  Delivered on programme and to Nelson City Council's quality expectations, the project demonstrates Tasman Civil's capability in structural remediation, where precision, planning and collaboration are essential to achieving successful long-term outcomes. It highlights the company's ability to strengthen and protect existing infrastructure—not simply build new assets.

• Capabilities Demonstrated

  • Structural Remediation

  • Ground Stabilisation

  • Retaining Structures

  • Rock Anchors

  • Concrete Piling

  • Ground Beam Construction

  • Urban Infrastructure

  • Traffic Management

  • Stakeholder Engagement

  • Quality Assurance

  • Collaborative Project Delivery