Case Studies

NorthConnex


Acoustic Design Services

Measurements in NorthConnex

Introduction
NorthConnex is a recently constructed 9 km road tunnel linking the M1 Pacific Motorway at Wahroonga to the Hills M2 Motorway at West Pennant Hills, Sydney.

Acoustic Modelling
Air Noise Environment Pty Ltd provided Acoustic Consultancy Services for the NorthConnex Tunnel project on behalf of LLBJV. The services related to assessment of air borne noise emissions from mechanical and electrical plant items such as jet fans within the tunnels and noise emissions from the ventilation stations. In addition, noise associated with substation heating and ventilation requirements, transformers and other items of plant were considered.

Analysis
Air Noise Environment worked with the detailed design and construction team to determine appropriate mitigation solutions for the plant items considered.

Conclusion - Results
This included recommended performance specifications for the acoustic silencers to be installed in the ventilation stations, and specification of acoustic rated construction materials for a range of buildings and structures.

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