PROJECT OVERVIEW.

To gravity drain a large residentialdevelopment, a series of long distance microtunnels at depths up to 13m were required to house the 225mm sewer pipes.

Harrington Grove Pezzimenti Microtunneling Method FreePipe

Harrington Grove Pezzimenti Microtunneling Length Diameter Sandstone Pipes

20 – 30m microtunneling averaged per day

3 microtunnels were  170+ metres (229m, 175m, 176m). The production rate ranged between 20 and 30m per day. Including set up and pipe pushing the project took 9 weeks from mid July to mid September.

580m microtunneled with no added water.

Killard Excavation won the head contract and excavated the drilling shafts. All 3 microtunnels were completed as single drives from the downstream end of each bore. There was little ground water moisture which allowed most of the 580m to be microtunnelled without any added water.

Harrington Grove Microtunneling Pezziment lowering rods with excavator

Drilling rods being lowered into shaft with an excavator

Harrington Grove Pezzimenti Microtunneling Setting up a rod

Freeboring in progress

Harrington Grove Pezzimenti Microtunneling Completely Dry Spoil

Spoil Heap. Dry ground conditions enabled dry drilling.

Harrington Grove Pezzimenti Microtunneling Vacuum Unit and Vacuum bins setup

2 vacuum tanks, modular vacuum power unit and the hydraulic power unit on site.

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