We move 'mountains'
by optimising geotech, earlier.

let's talk

© McConnell Dowell Constructors Ltd

our expertise

We start each problem from first principles, assess what is to be built and study how the ground will respond.

value engineering / optimisation

tunnelling

ground improvement

slope engineering

deep basements / foundation

temporary works

about us

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. Want to know more about Andy O’Sullivan?

Andy

Andy

Michael

Michael

Raymond

Raymond

Ain

Ain

Arman

Arman

Catherine

Catherine

Co

Co

Ohnmar

Ohnmar

Sofia

Sofia

Kurtis

Kurtis

James

James

Bede

Bede

Iris

Iris

meet the team →

projects

We go beyond for clients, we move mountains, we uncover secrets. Our team is proud of what we have achieved. Find out why here.

New Main Wharf North – Port Nelson

New Main Wharf North – Port Nelson

major upgrade to key regional port

read more »→

Auckland Central Interceptor

Auckland Central Interceptor

NZ’s largest water sector tunnelling project

read more »→

St Marys Bay to Masefield Beach Water Quality Improvement

St Marys Bay to Masefield Beach Water Quality Improvement

challenging urban tunnelling project

read more »→

Ara Tūhono – Pūhoi To Warkworth

Ara Tūhono – Pūhoi To Warkworth

major motorway extension through complex geology

read more »→

Redhills Wastewater Infrastructure Scheme

Redhills Wastewater Infrastructure Scheme

innovative underground pipe bridge design

read more »→

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

We have worked with Andy and his team through the past two earthwork seasons on a number of challenges that have been encountered within our project. From stabilisation of large cut slopes in challenging ground. The solutions have been realistic, reasonable and constructable and a real ‘value add’ has been having some of our team regularly working out of Andy’s offices in true collaboration.

Phil Millership - Engineering Manager, Fletcher Acciona JV

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.

Chris Osborne - Engineering Manager, Downer Group

Design and detailing of the soil – structure interaction for the Main Wharf North project was a considerable challenge for all involved. The ground improvement was required to stabilise the existing fill and alluvial soils, provide the majority of the lateral restraint for the entire wharf and back span slab in a highly seismic zone, all without excessive restraint of thermal and shrinkage actions. Andy and his team provided strong leadership in this complex interface, relentlessly driving efficiency and value in the solution.

Daniel Patten - Engineering Manager, McConnell Dowell

Over the past two and a half years, Andy and his team have consistently delivered innovative and efficient design solutions to a wide range of complex, geotechnically related, challenges on the City Rail Link Project.

Nigel McCreight - Engineering Manager, Auckland City Rail Link, Link Alliance