Our tunnelling experience is substantial and we can provide support to projects at any stage of development, from concept advice to construction and maintenance.
We have expertise that allows us to maximise the benefits of trenchless technology and manage risk to levels that provides certainty of outcome across the full extent of a project. Our worksites feature high safety standards and we have extensive tunnel management resources with a thorough working knowledge of the New Zealand regulatory environment and international best practice.
We have experience in a wide range of geotechnical conditions both in New Zealand and overseas. This has involved using drill & blast and hard and soft rock tunnel boring machine (TBM) construction methods, as well as using conventional excavation and sprayed concrete linings for complex underground structures.
Our staff have constructed tunnel linings using simple bolts and mesh, steel sets with timber laggings, concrete pipes, sprayed concrete and precast concrete segments.
Our broad New Zealand and international expertise allows us to bring fresh perspectives to looking at engineering issues and arriving at practical solutions.
We have access to an international supply chain for materials and plant that keeps us current with best practice and technological advances in this specialist market.
Shafts come in a range of shapes and sizes, from access shafts for tunnels and mines to deep excavations for drainage, tanks and other general civils applications.
We construct and support shafts using a range of techniques, including sheet piling, piles and timber laggings, ground improvement and simple bolts and mesh for temporary works. For permanent works we have constructed shafts using caissons, secant piles, and sprayed concrete.
We understand the risks associated with complex in ground structures and have experience in planning and executing dewatering and ground improvement for deep excavations.
Our staff bring extensive international experience which includes working in a range of geotechnical and groundwater conditions for civil engineering and mining projects.
This expertise enables us to deliver wider project outcomes for our clients. We’re supported by a network of specialist suppliers and industry experts, which complements our trenchless expertise by providing directional drilling capability, open cut pipeline capability and pipe repair and rehabilitation services.
We can construct deep pipelines in complex geotechnical and ground water conditions using a variety of techniques for ground support and stabilisation.
Our experience also includes the construction of manholes and associated structures and earthworks associated with detention ponds and other interconnecting civil works. This experience includes managing and executing works associated with reinstatement and new streetscapes.
Our ability to integrate both trenchless and conventional construction techniques means we have the flexibility to efficiently scope and execute works to mitigate interface risks for our clients.
We have participated in a wide range of wastewater projects from open cut pipeline construction to tunnelling projects that have ranged in size from 400mm to 2m in diameter. Our capability includes the construction of associated civil works including shafts and pump stations.
We have the skills to procure and manage other specialists such as designers, traffic management design and implementation, and mechanical and electrical services to ensure that we have total delivery capability.
Our stormwater projects often need to integrate with both the urban environment and the natural environment. Not only have we constructed numerous pipelines and associated structures, but we have also constructed outfall structures that need to fit seamlessly into their surroundings.
We have also used our expertise to construct complex structures in city centre locations where space is at a premium. This has included using specialist shaft construction methods to minimise our impact on city streets.
New Zealand’s energy infrastructure is diverse and the ability to work in a range of locations and conditions is important to supporting growth and development in the energy sector.
We have worked in remote locations such as the West Coast to deliver tunnels for the hydroelectric generation as well as providing urban infrastructure for transmission.
Working alongside other contractors and key clients we have provided support to a range of other infrastructure projects. This has included general civils, deep excavations and structures, marine works, piling and earthworks.
We recognise that we need to provide a range of services to support larger infrastructure projects and we have the technical skills and resources to do this. This is demonstrated by providing critical resources to projects such as Auckland’s City Rail Link.