East St Clair

PROJECT OVERVIEW.

Pezzimenti Tunnelbore completes a large scale industrial development in Horsley Park by Goodman Property Services – required 1,946m long lead in sewer with diameters ranging.

9 Seperate microtunnels

The downstream section of the lead-in followed the flood plain of Ropes Creek and the ground was saturated sandy clays, and clayey gravels. The upstream section moved away from the creek and the ground changed to shale. Out of the 1,946m 1,073m was microtunnelled in 9 separate microtunnels. In the non-self-supporting softer alluvial ground GRP jacking pipes were jacked. In the stable and self-supporting shale ground microtunnelling was done by Freeboring and then sliplining the jacking pipe into the microtunnel.

Pipe Design.

The project was designed by Qalchek, accredited designers for Sydney Water, who Project Managed the works on behalf of Goodman Property Services now Fielders. Qalchek called tenders and let the head contract to Athassel. Athassel purchased the GRP jacking pipes from Iplex. The pipes were manufactured in Adelaide by RCP. Once the primary parties had been nominated the detailed pipe design was finalised between Qalchek, Athassel, Iplex and Pezzimenti and submitted to SWC for final approval. Pezzimenti provided the final detail of the expected axial loadings on the pipes for the various lengths which decided the class of pipe to be chosen.