Allowances at the design phase for intercept bore
During the design phase allowance had been made to microtunnel from either end of each bore in case the intercept method was required. PSP excavated the shafts and the 318m bore was staged with the first half of the bore drilled to 200m from the downstream end. The rig was then relocated to the upstream end and 118m drilled to intercept the first bore. The Hobas pipe was then pushed in and the annulus grouted.
Single Longest Microtunnel at 262m
The 262m long bore was commenced from the downstream end and completed as a single drive to the exit shaft. This was the longest single drive accomplished so far by Pezzimenti Tunnelbore eclipsing the old record by 2m.
Deep Shaft and access.
First stage of the interept bore complete.
Second Stage of the intercept bore in progress