Wastewater network projects
Pipe bursting program
ActewAGL currently engages a method called pipe bursting to replace our old clay sewerage with modern plastic ones. It is a more efficient and environmentally friendly way of replacing our old pipes.
Why pipes get damaged
The original clay pipes, laid in some of Canberra's more established suburbs, are susceptible to tree root damage. Tree roots are attracted to the nutrients in the sewage that is transported through the pipes, and when a hair root penetrates a clay pipe the root quickly increases in size, blocking the sewage pipe and causing potential backup and overflow problems.
How we used to do it
Pipe bursting replaces the traditional method of digging up the old clay pipes, replacing them and then back filling. With the traditional method, vegetation often had to be removed and this caused damage to trees in some cases. The pipe-bursting process minimises the potential harm to the tree's root system.
How it works and the benefits of the pipe bursting process
The pipe bursting process involves much less digging.
- Holes are dug at the access holes and junctions for service branch lines and the vegetation above the ground remains undisturbed.
- A steel vibrating head is then winched through the old clay pipe, bursting the pipe as the steel head proceeds through it.
- The new plastic pipe is attached to the vibrating head, replacing the old clay pipe as the vibrating head is pulled through the pipe.
The entire process causes only slight vibration in the immediate area.
Pipe bursting is 60% faster than conventional methods of replacing pipes. This represents a significant saving to ActewAGL and less disruption to customers.
How pipe bursting can affect you
In some cases, customers will not be allowed to dispose of wastewater during the process. Customers will be notified by mail two weeks before pipe bursting commences in their area.
For more information on the pipe-bursting process, call ActewAGL on 02 6248 3555.