Major Highway Bridge Arrival and Departure Slab Lifting and ReLevelling

Site Profile

Transport for NSW (“TfNSW”) is the lead government agency of the NSW Transport cluster. Their role is to lead the development of a safe, efficient, integrated transport system that keeps people and goods moving, connects communities and shapes the future of our cities, centres, and regions.

Among many other things, TfNSW manage maintenance and repairs on the major highway network in NSW and the ACT. The Hume Highway connects Sydney and Melbourne and crosses a range of small creeks and water sources.?

The Situation

TfNSW identified subsidence on the highway bridge approach and departure slabs in both the northbound and southbound travel directions which was causing a potential hazard for highway traffic. Further to this, due to their experiences with previous other treatments for similar issues, it was decided that traditional ‘slab-jacking’ directly?underneath the slabs was not the most suitable solution for this subsidence, and that a deeper penetration slab-lifting and stabilisation solution was required.

This meant that the resin injection points and the subsequent expansion, lifting and stabilisation points were targeted for well underneath the approach and departure slabs. TfNSW decided upon rectifying this situation immediately and required a supplier able to deliver within a short lead time.

Having had previous interactions with Resinject, TfNSW contacted our Business Development team who, understanding the urgency and safety-critical nature of the request, were able to arrange an immediate site assessment and servicing for TfNSW.

Our Solution

Resinject proposed a tailored deep penetration solution and pier development to raise and stabilise the eight slabs and re-level the road?surface levels with the bridge roadway surface thereby minimising future risk to highway traffic.

The injection points for this treatment were targeted at four varying depths to create piers providing strength and support for the roadway.

?TfNSW accepted Resinject’s proposal, and the treatment was confirmed.

The Results

Resinject’s treatment design included a grid pattern of drill holes across all four lanes plus verges of traffic and incorporated a range of injection depths below the road surface.

After completing the proposed tailored injection solution, Resinject had been successful in raising the approach and departure slabs to the desired levels and brought alignment with the bridge roadways as planned. Furthermore, the works were completed within a staggered shift process which minimised the disruption to the highway traffic and public.

The collaboration between Resinject and TfNSW ensured the mitigation of risk and safety for personnel and the public.

TfNSW were delighted with the results, the efficiency of the service delivery and especially the quick response given the urgent safety nature of this project.

Acknowledgements

Resinject would like to thank the TfNSW team for the opportunity to demonstrate our time and cost-effective, sustainable solutions and for their permission to publish this case study.

Disclaimer

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