To support the future expansion of one of New Zealand’s largest aggregate sites, ICB delivered over 600 metres of high-strength Allan Block retaining walls. The solution enabled efficient land use, allowed surrounding works to proceed uninterrupted, and stood up to the demands of a heavy industrial environment.
Quick Facts
Over 600 linear metres of Allan Block retaining walls were constructed
Total face wall area exceeded 2,000 square metres
Wall heights reached over 5 metres near the quarry pugmill
Project was completed in under 3 months
LOCATION
41 Bill Stevenson Drive, Drury
CUSTOMER
Stevenson / Fulton Hogan
SERVICES
• Allan Block Retaining Wall
The Challenge
Drury Quarry plays a critical role in supplying up to a quarter of Auckland and Waikato’s aggregate needs. With the site's industrial land earmarked for development, robust retaining structures were needed to manage the terrain and maintain safe access for ongoing quarry operations. The challenge was to deliver a solution that could be built quickly, endure the demands of heavy machinery, and integrate with the work of multiple contractors.
The Solution
ICB Civil Construction partnered with ACH Consulting, Gaia Engineers, and Bowers Brothers Concrete to design and construct three mechanically stabilised earth (MSE) walls using Allan Block. The system was chosen for its durability, cost-effectiveness, and speed of installation.
Work was staged to ensure no interference with concurrent operations. Walls were independently constructed across the site, each tailored to withstand loading from quarry vehicles and nearby activity.
Key solution features included:
Rapid block placement and reinforced geogrid installation
Custom design to accommodate the pugmill and high-load areas
Coordination across stakeholders to avoid site congestion
Zero disruption to ongoing quarry operations
The Impact & Results
The completed retaining system delivered both immediate functionality and long-term durability. It provided safe, structured platforms to support future industrial land development while maintaining full access for quarrying activity. Completed in less than three months, the project demonstrated ICB’s strength in industrial-scale civil delivery, backed by a reputation for speed, quality, and cooperation
OUR WORKRelated Projects
-
![]()
Premium Retaining Wall Installation for Elevated Residential Development
ICB constructed three Allan Block retaining walls to support steep terrain and infrastructure in a high-end housing development, delivering precision and durability within tight tolerances.
Customer: Murphys Park Development LP
Location: 125a Murphys Road, Flat Bush -
![]()
Patterned Retaining Walls for Premium Subdivision
Using the AB Ashlar Blend system, ICB built visually distinctive and structurally sound retaining walls to stabilise steep slopes in a high-elevation residential site.
Customer: BR Land Company Ltd
Location: Bremner Ridge, 315 Flat Bush School Road, Flat Bush -
![]()
Slope Stabilisation for Emergency Road Access
ICB used a soil nail and mesh system to stabilise a steep slip site on Kaiikanui Road following Cyclone Gabrielle—protecting a critical access route for local communities.
Customer: Whangarei District Council
Location: Kaiikanui Road, Opuawhanga -
![]()
Deep-Piled Retaining Wall Restores Road Stability at Ahuroa Road, Puhoi
ICB installed a tied-back palisade wall with deep concrete piles and 24m anchors to stabilise a major slip on Ahuroa Road—successfully maintaining traffic flow and protecting vital infrastructure.
Customer: Auckland Transport
Location: Ahuroa Road, Puhoi
