As a part of a larger overall maintenance package Aaro was asked to structurally reline this twin barrel 5.75m dia multi-plate tunnel originally installed in the 1960’s. Upon inspection of the structure it was evident that this larger tunnel could be fully ‘relined’ using our Centripipe product but an alternative was also looked at to try and provide a more economical solution for the client.
On this project the client, Yurra, was looking for a 50 year solution for the refurbishment of this culvert. As part of our assessment, we took into account the geotechnical considerations specific to the location, live rail loading and a condition assessment of the insitu structure. Once this was all known and modelled, we were able to come up with a design that dealt not only with the deteriorated tunnel sections but also took into account the shear forces that are required to be addressed when not completing a full structural reline. Ultimately the alternative proposed with the engineering submitted with our proposal was accepted by the client.
On site we had to deal with a very remote location and tight access requirements with very strong environmental and heritage controls on site. Together with all stakeholders we were able to establish a site layout design and traffic management plan to mitigate any of the tight environmental and heritage risks that were in close proximity to this site. Planning on material delivery into a site like this is something that requires a lot of communication and planning when you are 1500km away from home and you do not have phone reception on site but our Perth and Pilbara teams were able to work together on making this process as close to seamless as possible.
Upon completion of the lining works, we were asked by the client as an addition to the contract to fix some of the culvert access issues and complete some embankment repairs so that all works are completed and the rail civil maintenance team did not have to make another re-mobilisation to site.
All in all, a successful project from our end and we were able to save the client money while still delivering to the required specification so we hope all involved are walking away from the project with a positive experience.