| The Toowoomba Range rail corridor forms part of the West Moreton System and connects South-West Queensland to Brisbane. This line carries approximately 113 return paths per week and is a major link for coal transport to the Port of Brisbane and passenger services from Brisbane to South-West Queensland via the Westlander service.
In June 2020, Queensland Rail engaged an external geotechnical consultant, SMEC, who completed an assessment of the cuttings and embankments on the Toowoomba Range between Harlaxton (157.790km) and Murphy’s Creek (131.400km). This assessment identified several high-risk sites which require vegetation maintenance, rock removal and/or mesh, whilst other sites required a larger scale of works such as soil nailing. There is a total of 107 prioritised sites on the Toowoomba Range which consist of 12 embankments and 95 cuttings, most of which were assessed as low or medium risk and considered an acceptable exposure in the short-term with respect to Queensland Rail’s risk evaluation. Seven embankment sites were assessed as high-risk due to the potential for a large slip or landslide eventuating. These highest priority sites informed the development of the scope for this project.
At one of these high-risk sites (embankment at 141.070-141.170km), there is currently an upper access track adjacent to the rail track and a lower access track on the embankment, constructed and used during the recently completed tunnel lowering project, which is now unsafe and closed. Two inclinometers were installed at the site to assess the movement of the upper access track and underlying rock units. Monitoring to date indicates that no significant deep-seated movement has occurred within the rock. Further slippage of the upper access track occurred in March 2021, with a 30m long slip scarp extending into the upper access track. The rail tracks appear to be unaffected, and the inclinometers show no signs of deep-seated movement within the rock. In May 2021, the upper access track was closed for vehicle and plant access. Further slope slippage occurred during the February/ March 2022 wet weather event, but the rail tracks were not affected.
This tender aims to establish a Major Works Contract with a suitably capable and experienced Contractor for the Stage 2 of the Toowoomba Range Slope Stabilisation (TRSS) works ensuring high quality service, achieved deadlines and value for money.
The tender is for “Construct Only” works; detailed design for the remediation options have been completed.
The Contractor will be responsible for undertaking slope stabilisation works at embankment 141.070-141.170km including additional drainage, scour protection, soil nailing and shotcreting of the slope adjacent to the upper access track and reprofiling and scour protection on the slope below the lower access track.
The following works are identified as out-of-scope for this activity:
- Track upgrades
- Undertrack drainage modifications
- Service relocations
- Access road upgrades
- Remediation works at other sites on the Toowoomba Range
Refer to Section C – Specification & Statement of Work for detailed scope of work descriptions.
Queensland Rail will also be conducting a mandatory site inspection on 14 September 2022, this will commence from Murphy's Creek Train Station.
Details on how to register for both the information session and site visit is contained within the tender Preamble document.
Tenderers who wish to access the complete package of tender documents and are interested in submitting a response please follow the below instructions:
1. Tenderers are to email the nominated Contact Officer (timothy.goodberg@qr.com.au) to register for access to the tender documents and online response form in the Ariba Sourcing system.
2. If the Tenderer elects to submit a tender response, they must do so by using the Ariba Sourcing system.
3. Tenderers are encouraged to carefully read all documentation available for download in the Ariba Sourcing system to ensure the tender submitted meets all Queensland Rail’s requirements. Queensland Rail will only accept tender responses submitted via the Ariba Sourcing system.
For this tender (QRP-22-29), the information uploaded on QTenders is not all the tender information, however it is intended to assist suppliers / interested tenderers to determine whether the scope of works is suitable for their company profile and capability. All enquiries in relation to this tender must be made in writing to the Contact Officer above.
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