Drilline have employed temporary bypass piping systems on numerous projects, ranging from minor bypass systems to complex, long-term installations involving pump stations, varying terrain and above/below ground road crossings.
The bypass systems are backed up by Drilline’s vacuum ducting and controlled waste removal capabilities.
“The most notable of these projects was the rehabilitation of 3 km of main sewer along the South Perth foreshore; a highly-trafficked public area bordering the Swan River,” Drilline said.
The project was subject to numerous constraints – including strict environmental requirements due to the proximity to the river and the need to minimise impact on the foreshore users.
Drilline employed the Aquamine system for nearly 2 km of the bypass.
The Aquamine system comprises a high impact PVC composite with a unique locking system that renders it virtually tamper proof.
The system was also successfully employed in more recent projects including the St Georges Terrace Sewer Refurbishment Project.
This project involved the CIPP relining of a 650 m oviform sewer pipe, which required the bypass system to be set up and dismantled within a twelve-hour working time frame imposed by the City of Perth.
Other considerations included the pedestrian requirements of a busy CBD thoroughfare and access to the adjacent office buildings.
A combination of the Aquamine system and HDPE bypass piping was employed during the refurbishment of the Rivervale Main Sewers – north and south.
The Rivervale Main Sewers required a temporary bypass of over 1 km through commercial and residential areas adjacent to the Swan River and major arterial roads.
In some instances lay-flat piping was utilised in residential properties to minimise impact on established gardens and fencing, which reduced reinstatement requirements.
The most complex of the recent sewer refurbishment projects involving substantial temporary bypass was successfully completed in the inner-city area of Claisebrook.
The inner-city bypass, comprising of over 1 km of HDPE pipe, involved an installation beneath paved footpaths and roads with restricted access due to traffic movements and the installation of a pipeline within the Perth Transport Authority rail reserve.
A substantial pumping station was also installed to control flows of up to 300 litres per second.
“Running through mixed high-density residential and commercial areas and along the rail line, the installation was considered extremely sensitive due to its highly visible nature and potential impacts on the surrounding environment,” Drilline said.
Drilline has not had an environmental incident reported to date and continues to explore avenues for potential improvements to the current systems.
