Depending on the selected ring rotation, the following ring will have a specific build direction that relates to the shield movement. The optimum ring position is a critical part of tunnel construction. This system automatically calculates the optimum ring sequence for tunnel drives that include segmental lining. For this purpose, VMT supplied two of its TUnIS Ring Sequencing systems. In addition to calculating and displaying the current advance of all parts of the machine, in particular the front and gripper shields, information is available regarding the comparison of roll between the front and gripper shields and the deviations to the designed tunnel axis.įor optimisation of tunnel advance it is also important to utilise the correct support ring sequencing. Based on a total station, a target unit installed within the TBM shield along with other components determine the current advance position. To many tunnelling engineers, the navigation system for a Double Shield TBM is seen as one of the most demanding in tunnelling.
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Whilst the TBMs and roadheaders were doing the heavy work of excavating the ground, they required logistical back-up in the form of navigational tools, segment lining control, lining ring sequencing and data management hardware and software including Segment Documentation systems.Īll of these systems were provided throughout the project by specialist navigation and site management systems manufacturer VMT GmbH of Bruchsal, Germany.įor the TBMs, VMT provided two TUnIS Navigation Double Shield systems. The tunnels commenced in February 2021 and were completed to breakthrough in December 2021.Īs well as the TBMs, the project used six electrically powered roadheaders for other excavation works including the finely controlled excavation required for shallow tunnel, cross passage, and station cavern excavations. The tunnel drive lengths were 4,098m and 4,083m respectively with curves of minimum radius 415m. Both machines were Double Shield TBMs of 7.18m diameter. Both tunnels were constructed using Tunnel Boring Machines (TBMs) manufactured by Herrenknecht AG.
The twin tunnels commenced at Woolloongabba and headed north breaking through into station caverns at Roma Street and the northern portal. The project is also responsible for the delivery of significant accessibility rebuilds to six above-ground stations from Salisbury to Fairfield on Brisbane’s Southside, construction of three new stations on the Gold Coast, and the introduction to the wider South East Queensland (SEQ) rail network of the European Train Control System (ETCS). The Queensland Government has invested $5.4 billion in the project which will deliver four new underground stations at Boggo Road, Woolloongabba, Albert Street and Roma Street and two new stations at the RNA Showgrounds and Dutton Park.
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