VARSITY LAKES TO BURLEIGH, M1 UPGRADE
Snapshot
DEMEX undertook bridge demolition works as a subcontractor to the project principal, Seymour Whyte on the Varsity Lake to Burleigh section of the project. Demolition of the existing vehicle bridge commenced after construction of the new bridge was underway. Project works were conducted while the multi-lane motorway
remained operational, with both day and night works conducted to minimise traffic disruption. The bridge was constructed predominantly of steel, concrete, and polystyrene, with the latter representing a challenge as the disturbance of polystyrene needed to be minimised due to the high traffic environment.
Project Role
Subcontractor
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Project Scope
In terms of method, mechanical demolition was used to deconstruct the bridge. A series of plunge cut saw cuts were administered to separate the bridge deck into three equal sections approximately six bridge deck units wide. The plunge cuts were cut to a depth sufficient to disengage the mac-alloy bars in the deck units, allowing the demolition to occur with relative ease.
Project Highlights
- Method to deconstruct deck allowed for program to be completed four days early.
- Innovative protection screen that prevented fly rock from entering live motorway.
- Method for managing polystyrene prevented environmental incidents.
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