Case Study: Major Highway Bridge Departure Slab Lifting and Re-leveling

Our Solution:

Resinject proposed a tailored deep penetration solution to raise the departure slab and re-align the road surface levels with the bridge roadway surface which were in some places originally up to 40mm different from each other.

The injection points for this treatment were targeted at between 1.0m and 2.5m below the road level which enabled our resin to be injected underneath the underlying cement-sand layer which would facilitate the slab and sand-cement layer to be lift as a single mass as desired.

TfNSW accepted Resinject’s proposal, and the treatment was confirmed for the following day. The works were performed under alternating lanes of live traffic where TfNSW managed the required traffic control accordingly.

Resinject’s treatment design included a pattern of thirty drill holes across both lanes of traffic, and incorporated injection depths of 2.5m down from the road surface. After completing the proposed tailored injection solution, Resinject had been successful in raising the approach slab and sand-cement mass to the desired levels and brought alignment with the adjacent roadways as planned. Furthermore, the works were completed within a single shift which minimised the disruption to the highway traffic and public.

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

Resinject-Case-Study_TfNSW-Wollogorang-Creek-Bridge-Approach-2.pdf