The Hills M2 Motorway upgrade is a $500 Million project comprising widening of the existing motorway between Baulkham Hills and North Ryde. The structural works comprised significant retrofitting of the existing bridge structures as well as widening the existing Norfolk Tunnel. Demolition of several structures was also required as part of the project.
Our infrastructure team was responsible for the development of the temporary works to enable the complex retrofit works to be constructed. Work packages included:
- Hanging formwork structures
- Acoustic and containment structures for tunnel widening works
- Temporary access bridges
- Climbing formwork systems
- Bridge demolition methodology
- General structure demolition methodology
- Tower crane installations
- Walkway brackets and temporary stability systems for precast Super Tee girder installation
RBG’s construction engineering team designed several formwork structures that were suspended from the underside of existing bridge structures, to enable bridge alteration works to be constructed above live traffic. The formwork structures utilised a combination of proprietary systems and bespoke elements to complete the works.
Bridge Demolition Methodology
Our Construction Engineering Team developed the methodology for demolition of a four-span cast in situ post tensioned bridge that spanned across the M2 Motorway. The bridge was demolished using excavators with the pulverising attachments. Due to the presence of stressed steel tendons, a sequence for demolition was developed to ensure that the bridge structure remained stable at all times during the demolition process. The bridge was safely and successfully demolished within the shutdown period, with no disruption to traffic outside the shutdown period.
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