Ferrycarrig was engaged by John Holland to undertake a portion of the works for the upgrade of Stage 2 of “More Trains, More Services” service improvements to vital rail corridors including the T4 Illawarra and T8 Airport lines.
The NextRail partnership (John Holland and Jacobs JV) is fulfilling the contract between Central and Hurstville with a program of works including upgrades to rail infrastructure such as stabling yards, signaling, track, and power supply.
Ferrycarrig has undertaken two main scopes firstly to install the HV feeder pit under a complex FRP scope and secondly to install all CSR works for the project including a challenging under bore under numerous vital water, communications, and electric assets.
The HV Feeder pit was compiled of three separate pits that fed the new substation for the station. It entailed a complex excavation alongside numerous assets including Sydney Trains HV assets in challenging ground conditions. Ferrycarrig’s project delviery team inserted specially engineered shoring boxes for a prolonged period until the FRP top slab was formed and ready to pour
This pit was fed with approximately 10km of 200mm HD conduits which also fed the new substation. Services such as HP gas, HV electrical assets, and vital communication assets for Sydney Trains had to be considered when trying to excavate trenches around them.
The management of potentially contaminated spoil and import of energycrete also required close attention from the project management team.
Some of the key challenges regarding the pit design were ensuring accurate RLs alongside the top of the base slab, challenging ground conditions, and a complex reinforcement schedule.
A close relationship was maintained with vital suppliers to ensure that all materials were of suitable quality.
The Ferrycarrig project team identified numerous design issues that required numerous RFIs to be clarified to ensure the design was the right fit for various aspects of the project.
As with all Ferrycarrig projects, our approach to achieving high-quality and efficient project outcomes is through working directly with our clients to resolve issues and add value. As the issues were identified early, they were resolved without any impact on the budget or program.
The project team’s experience and problem-solving approach were key to resolving numerous design issues in a short timeframe and deliver a high-quality program of works as a result.