Stormwater Network Repair
Sydney Olympic Park Remediation of Storm Water Network
Client: Sydney Olympic Park Authority (SOPA)
Project: Remediation of the storm water drainage system serving the Sydney Olympic Park Complex
The Sydney Olympic Park Complex is served by a comprehensive storm water drainage system that covers all road, parkland and building drainage needs for the site. Apart from the system serving the Newington area, the storm water drainage system is relatively new being completed during the late 1990’s.
ITS Trenchless operates a fleet of hydraulic pipeline robotic units, for the internal repair and sealing of defective pipelines. The units are fully self contained, and can operate in diameters of 135-800mm. The robotic services available include:
- Cutting of intruding laterals
- Removing encrustation
- Preparation for lining
- Reopening laterals
- Epoxy sealing of junctions and pipe defects
This project emerged after investigation by SOPA found that the network had suffered significant damage during construction of the park site, as well as the detection of a number of other defects that had not been identified prior to handover. ITS was awarded the first contract in February 2007 (18 months in duration) and the second in June 2010 based on key assessment criteria of experience, technical expertise, methodology and price.
Remediation of the Storm Water Network for Sydney Olympic Park
Both Contracts involved the remediation of the storm water system which is constructed from concrete pipe ranging from 300mm to 1800mm diameter and some large box culvert sections. SOPA was concerned that soil would infi ltrate the storm water drains through the fractures that had been detected all of which extended right through the walls of the pipe and in some cases exceeded 25mm in width. Pipe lifting holes that were not plugged posed a risk of soil ingress by rodent entry and defective cut-ins had exposed reinforcing steel that needed to be protected. ITS Trenchless was engaged to undertake the necessary repair works to restore the structural integrity of damaged pipes and to prevent the ingress of the surrounding ground into the conduit which could result in subsidence of the surface. The scope of works included:
- Pipe cleaning;
- Re-survey of the storm water system from which a condition assessment report identifying
- defects was prepared;
- Submission of a repair plan to SOPA; and
- Final repair
The condition assessment determined that one of the key problems was open joints allowing soil to enter the storm water system. The pipeline robotics unit was used to prepare the pipe for a full structural repair primarily through removal of various obstructions from pipelines (grinding/milling) defects. Approximately 300 defects were identifi ed requiring repair in the fi rst Contract and 81 defects in 32 pipelines in the second contract. In performing the fi nal repair work, three methodologies were used:
- Man entry for greater than 800mm diameter pipe using cementitious and epoxy repair material
- Robot applied epoxy injection for sealing of junctions and pipe defects
- Point-Lining® for the repair of cracks, fragmentation, leakage, broken joints, capping off disused
- junctions, defective liner installations and corrosion.