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Kensington Victoria


Metro Tunnel


125mm SDR 13.6 HDPE conduits


Cat C – Coode Island Silt


> 500 m

Each bore had a horizontal change of alignment over a smooth radius to destination and had a vertical radius of up to a maximum of 8.9 meters while crossing Kensington road.

The bores consisted of 13 x 125mm SDR 13.6 HDPE conduits over the required bore length of 150 meters , conduit lengths being 152 meters

Challenges – Tracking of the pilot due to interference – Skills, knowledge, experience and planning by the team resulted in delivery as per design

Highlight- Delivery well before program timelines, knowing all the planning and hard work resulted in a positive outcome

RIA Staff – excellent to work with – preparation and daily support of the highest level

Project Value:
Delivered a bore per 2 shifts

Bore 1 : Day 1 pilot , Day 2 ream and install conduit configuration to bore

Bore 2 : Day 1 Pilot , Day 2 ream and install conduit configuration to bore

Program delivery dates – met earlier than programmed


  • High water table
  • Coode island silt
  • Cat C soils
  • High interference levels
  • Restricted zones

Number of ppl required / team:

Average team of 7 personnel

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Techniques required, materials required:

Construct using Vermeer D60 x 90 Horizontal Directional Drill

Digitrak F5  Falcon Tracking system

Defined Mud mix to suit known Geological Conditions

Adequate water and Mud mix resources to permit consistent supply as required upon demand

Ample Vacuum Trucks to ensure smooth transfer of drilling slurry to Tip site without incurring delays to process

Special purpose tooling – reamers

Skilled Team

Precise planning pre commencement

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