The 500m was split into 2 sections 152m and 337m. A 16m deep shaft was constructed at Ch 152. The 152 m x Ø530mm microtunnel was constructed first, and then the 337m intercept bore was completed in 2 stages- 173m from the upstream end and 164m from the deep 16m shaft on the downstream end.
Intercept Microtunnel – 35m Below
The intercept microtunnel met within 40mm at the breakout point some 35m below the Connaught St ridge. The PE pipe was pulled in in one continuous length by the client and the annulus grouted by Pezzimenti Tunnelbore.