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The Joseph Gallagher Group complete microtunnelling project in Abu Dhabi

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World Trenchless,

The Joseph Gallagher Group have announced the completion of a microtunnelling project in Abu Dhabi, UAE. Joseph Gallagher International were engaged by Mechanical and Civil Engineering Contractors Company (MACE) LLC to complete a new pipeline on behalf of Abu Dhabi Sewerage Services Company (ADSSC).

The new pipeline will serve local areas and communities in Abu Dhabi, and is part of a longer-term plans to support population and infrastructure growth in the region.

The pipeline was completed using 10 tunnel boring machines, which were ISEKI Microtunnelling Systems, and three AVN Herrenknecht machines all owned and operated by the Joseph Gallagher Group and maintained directly by their engineers and support teams.

The microtunnelling machines were set-up for diameters ranging from 600 - 2000 mm and customised to the varying ground conditions encountered, including gravel, clay/mudstone, gypsum, sandstone, quartz, and sand.

Individual drives varied in length from less than 100 m to 670 m.

Despite the challenging ground conditions, a large part of the project’s success is testament to the resources, support and agility of the Joseph Gallagher Group. This provided a real advantage to the project in terms of addressing any technical difficulties.

Early in the project, NRC Plant Limited (part of the Joseph Gallagher Group), deployed four crawler cranes to support the project, shipping these from the UK to Abu Dhabi. The cranes ranged from smaller 5 t crawler cranes to a 90 t for lifting the tunnel boring machines into the shafts. Specialist Plant Associates (SPA – part of the Joseph Gallagher Group) shipped high performance ventilation fans out to the project from the UK to help keep the machinery at as low a temperature as possible. Due to the significant heat at the project locations, maintaining a cool airflow with chillers into the tunnels was vital. SPA also dispatched grout pans which were used to grout the annulus of all 83 tunnel drives.

At the height of the project, a multi-cultural team of over 200 people, including support from the UK, our people from Thailand, Egypt, India, Philippines as well as the UAE were all involved in bringing the pipeline to a successful conclusion.

The Joseph Gallagher Group have other projects currently operating in the region, including Kuwait, where they will be commencing work on the longest sea-outfall pipeline in the Middle East for WTE Wassertechnik EVN Group under a joint venture with Al Hassanain. The Umm Al Hayman Wastewater Treatment Plant, one of the world’s largest wastewater projects, is being built to treat effluent from southern Kuwait and to supply agriculture and industry with wastewater treated to the highest standards.

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