our expertise

Geotechnical problems are often complex in their nature and solutions require balance and judgement. We approach every problem from First Principles to really understand the ground and anticipate how it will respond to what is to be built. That gives greater certainty. For us – and for our clients.

value engineering / optimisation

tunnelling

slope engineering

deep basements / foundations

ground improvement

temporary works

projects

Our team of specialists have experience in all major Infrastructure Sectors. Browse projects by sector or see all our projects.

New Main Wharf North – Port Nelson

major upgrade to key regional port

Auckland Central Interceptor

NZ’s largest water sector tunnelling project

St Marys Bay to Masefield Beach Water Quality Improvement

challenging urban tunnelling project

Ara Tūhono – Pūhoi To Warkworth

major motorway extension through complex geology

Auckland City Rail Link

largest transport infrastructure project in NZ

The Andy O’Sullivan team developed the design for the temporary works as part of the Barber Grove ECI. This included several aspects of geotechnical design from retaining structures to specialist considerations associated with TBM works. The AOS team provided practical and progressive solutions in a demanding geotechnical environment and as a result, the well-considered designs bought real value to the project.

Daniel Crichton - Senior Principal Engineer, Downer Group

Andy has been able to bring specific knowledge from previous projects in Auckland, therefore with Andy and his team, we were able to optimise some design elements. By involving Andy O’Sullivan in the early stages of the design they were able to add value to the project.

Francesco Saibene - Project Director, Ghella Abergeldie JV

Andy O Sullivan had a great understanding of the contractors focus to provide a safe and efficient solution for the shaft works on the Saint Marys Bay Project. Their willingness to investigate change and be flexible during the construction phase allowed the project to realise opportunities and achieve a successful outcome.

Grant McLean - Senior Site Executive, McConnell Dowell

Andy O’Sullivan have provided Abergeldie innovative temporary works designs and geotechnical assessments reducing cost and programme on many of our construction projects.

Andy O’Sullivan are easy to work with and quick to respond to our requests.

Alastair Blackler - General Manager, Abergeldie Complex Infrastructure

Andy has always made time to work with us, often without prior notice. His team listens to what we want to achieve, then works collaboratively to develop innovative and cost effective solutions.