Results
Full tunnel length successfully sealed against water ingress.
Structural performance of the tunnel lining improved.
Works completed safely while maintaining potable water supply integrity.
Project
Solution
Installation of caps on grout ports within isolated lining sections.
Sequential grouting process starting from the lowest ports and progressing upwards.
Construction of grout barrier rings to control grout flow.
Grout design and testing carried out prior to production works.
Project
Challenges
Requirement to strengthen tunnel lining while maintaining water supply security.
Risk of grout loss between neighbouring ports during injection.
Need for controlled sequencing to ensure complete void filling and sealing.
Project
Overview
SEQ Water commissioned upgrade works on the Nerang Tunnel to strengthen the lining and seal against water ingress. The project involved constructing grout flow barrier rings and completing contact grouting progressively along the tunnel, ensuring the integrity of a key potable water supply asset for the Gold Coast region.