In November 2012 UEA Trenchless was awarded a design and construct pipe bursting contract in South East Queensland. The design phase has been completed and construction is now under way. UEA has been contracted to replace 1100m of 150mm asbestos concrete pipe and PVC sewer rising main with 250mm PE pipe using pipe bursting technology.
As asbestos is present, correct handling measures have been undertaken by qualified asbestos specialists during the excavation and pipe bursting process. One of the major benefits of pipe bursting over conventional trenching methods is contact with the asbestos concrete pipe is limited, as excavation is only required approximately every 110 metres.
At present some unknown repair sections of gibaults and PVC as well as the shallow depth have caused some issues, but UEA ‘know how’ combined with a good relationship and ongoing communications with the client have overcome all issues that have arisen so far. Another unknown that was found during the bursting process, was sections of DICL pipe under road crossings which have called for different tooling to be utilised. This specialised tooling has to be imported from Germany and is currently on route.
The program of works is on target to have the pipe bursting completed by early February, with restoration, testing and commissioning complete by mid-late February.
Photo caption: New 250mm PE with bursting head entering existing 150mm Asbestos Concrete pipe.