The situation

Sydney Trains identified that the sandstone culvert at Lavender Bay was in need of an urgent repair. Whilst the culvert was in a fair condition structurally, there were numerous leaks and a high level of water infiltration as well as significant wall displacement that was catching flow debris.

These deformations caused ongoing blockage issues and as a result Sydney Trains was eager to resolve the problem considered as a risk to their network.

The challenge

Challenges specific to this site included the restricted access as this particular culvert outlet led into Sydney Harbour. In addition, the access to the upstream side was restricted by the rail lines and nearby high-rise buildings. Access was only possible via a barge on Sydney Harbour which added to the complexity of the project.

Environmental safeguards were also a special consideration due to potential impacts associated with construction works being undertaken in sensitive areas.

As a result, Downer PipeTech adhered to the strict EPA guidelines outlined during the preparation, planning and construction works.

The solution

To address these issues PipeTech proposed sliplining of the box culvert using HDPE pipe ensuring the functionality of the asset with a large portion of the critical construction works being undertaken via barge. The project was successfully completed on time, within budget and without any issues.

Furthermore, there were no negative impacts on the surrounding stakeholders including local residents and the community who utilise the Luna Park precinct.