Leppington

244m single drive

One bore in particular was in a deep area. The designers designed manholes approx 250m apart in accessible areas. A microtunnel was required to construct the pipeline between them at a particularly flat grade, so accuracy over that distance was paramount.

The shafts were setup for an intercept bore as, depending upon ground conditions, it may not have been possible to bore the entire 244m from one end. As it turned out, the bore was completed successfully from one end in favourable conditions. There was no need to intercept the first bore from the far end.

Installing the PE250

Diona installed the polyethylene carrier main by stringing it out on the surface and pulling it through. They agreed that this was a difficult task at such depth – with poly being not that flexible at that diameter during the colder months.

A better solution would have been to have Pezzimenti install 3m GRP lengths for the same result.

Two other shorter pipejacks were completed on the same Project under Camden Valley Way and Bringelly rd using steel sleeve as the enveloper. Once completed, the GRP carrier main was inserted and grouted.