Case Study - WestConnex Rozelle Interchange

Thank you for your interest in this webinar. Unfortunately, it has closed for registration. However, it will be available on demand in the near future. Please keep an eye out for this on our website or contact the Concrete Institute of Australia at [email protected] for more detail.

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Thursday, 11 June 2020
2:00 PM - 3:00 PM


Zoom Webinar , Online, NSW CIA


The Rozelle Interchange and Western Harbour Tunnel Enabling Works is being designed and constructed by the John Holland CPB Contractors (JHCPB) Joint Venture. Recently, the Reinforced Earth Company played an important role in this project.

The temporary works design included a Temporary Alignment Ramp at Victoria Road East (ETAR). The ETAR connects Victoria Road to ANZAC Bridge east bound and allows a tunnel haul road to cross underneath by using a precast concrete Arch system. The Reinforced Earth Company designed and supplied this custom arch solution to JHCPB in April 2020. 

This presentation will cover the basic theory of the precast arch design and the importance of ensuring the structural design of the arch elements takes account of all of the stresses the element must withstand. It will also cover the challenges to be overcome during the fabrication of large precast arch sections and the feedback received from those tasked with installing the unit. The choice of TechSpan as the traffic separation solution will also be discussed.

This seminar covers the design stage through to the installation of the Precast Concrete Arch Solution as part of the WestConnex Rozelle Interchange project.



CIA Members $33.00 CIA Student Members $22.00 CIA Retired Members $22.00 Non Members $55.00


Mr. Antonio Ramirez Martinez
Design Manager Southern Region - The Reinforced Earth Company, Australia

Mr. Florent Sygall
Manager East Coast - The Reinforced Earth Company Australia


TechSpan Arches: Use of funicular curve theory to optimise Arches
This presentation will address the basic theory of the precast arch design. Each element is designed for combined bending, shear and axial loading, using non-linear Finite Element Modelling (FEM) to model the interaction between the surrounding soil, the loading sequence and footings. The result is an optimised arch shape that minimises tensile stress in the concrete in its service condition.

The structural design of the arch elements considers all of the stresses to which the element will be subjected, including handling and transport, backfilling and the final service loading conditions.

Fabrication, delivery and installation of TechSpan Arches at WestConnex Rozelle
This presentation will address the challenges overcome during the fabrication of the large precast arch sections, including moulding, concrete placement, storage and delivery. Feedback from the contractor tasked with installation of the unit will be provided as to whether the arch was appropriate for the limited workspace and strict operating environment of inner west Sydney. The choice of TechSpan as the solution to the traffic separation will also be discussed including the advantages and disadvantages of various solutions such as the arch product and the plank option.


The webinar will run from 2.00pm to 3.00pm and is based on NSW time (Australian Eastern Standard Time).

Delegates will be sent login details and a password for this webinar prior to the event by email.

Times for all States:

NSW/VIC/QLD/TAS/ACT  2.00pm to 3.00pm
SA/NT 1.30pm to 2.30pm
WA 12.00pm to 1.00pm

Communication Devices

Please note that audio and video recording or taking photographs is prohibited during this event without express approval from the Concrete Institute of Australia.

By making a booking you are acknowledging that you have read and accept the Concrete Institute of Australia’s
Terms of Service.