Andun worked with Coleman & Co. at tender stage and following Coleman & Co.’s successful contract award. The original proposal for the demolition was to erect a tower crane to deconstruct the structure to a level where an Ultra High Reach machine could be used to complete the demolition. Following the award of the contract, a decision was made to carry out the works without a tower crane, and to instead use Brokk 160 machines to deconstruct the tower to a point where the Ultra High Reach machine could be utilised.
Andun’s role on the project included the following:
- Design of Tower Crane base;
- Assessment of the existing structure to determine allowable plant loadings;
- Design of the back propping required for plant and scaffold loadings;
- Assessment of the global stability of the structure to confirm the required sequence when demolishing the structure with the Ultra High Reach machine;
- Assessment of the uplift forces on the structure, due to buoyance effect of the basement. This included the required fill quantities and methodology for backfilling in a confined area;
- Design of working platforms for a 200 tonne Ultra High Reach machine. This includes back propping the existing basement;
- Design of a system to protect surrounding structures when the Ultra High Reach machine was being used;
- Design checks on the critical 36m high cantilevered scaffold and the 86m high scaffold, which were erected for the deconstruction phase of the works
