The Kinross Estate is an industrial park being developed by the CABP Group Pty Ltd in Heatherbrae, NSW. To develop the site the final levels need to be elevated to above the forecast flood levels. Previous stages were filled by conventional construction equipment with sand sourced from the other side of Masonite Road. The aim of this project was to use dredging techniques to transport the sand without the significant inconvenience to local road uses of construction traffic crossing the Road.
Scope of Work
Stage 9 of the Kinross Industrial Estate required the importation of 40,000m3 of sand from a stockpile located on the other side of a major Road. Neumann Contractors were challenged to develop a technique where the sand could transferred hydraulically through a pipeline and placed directly into the embankment.
Conventional dredging equipment could not be used due to the sensitivity of the local groundwater aquifer. Neumann proposed to use captured bore water (extracted under license) to feed a dry feed bin that would blend the sand and water and then pump the slurry under the Road to the fill area.
Neumann designed and fabricated the dry feed bin and then designed and constructed a bore water holding pond at the stockpile site. A pump was installed in the holding dam that fed the dry feed bin with the bore water and a slurry booster pump was connected to the outlet of the bin. Twin 315mm poly pipelines were installed from the booster pump, under the Road and to the fill area. One pipeline was used to deliver the slurry to the fill area and the second was used to return the slurry supernatant water back to the holding pond for reuse. The sand was loaded into the dry feed bin with wheel loaders working in conjunction with dual screen hopper stockpilers.
- Design and fabrication of the sand dry feed bin
- The extraction, storage, use and re-use of bore water to hydraulically transfer the sand.
- Minimising the loss of bore water at the fill area.
- Water proofing the bore water containment pond.
- Maintaining safe navigational access for all boating traffic in this very popular and busy recreational waterway.
All works were performed on time and within budget. The CABP Group were very satisfied with the outcome of the project.