top of page


Get to Know Slurry Microtunnelling    Method   

Microtunneling is defined as a remotely-controlled, guided, pipe-jacking operation that provides continuous support to the excavation face by applying mechanical or fluid pressure to balance groundwater and earth pressures.

  • ​Microtunneling requires jacking and reception shafts at the opposite ends of each drive.

  • A microtunnel boring machine (MTBM) is pushed into the earth by hydraulic jacks mounted and aligned in the jacking shaft. 

  • The jacks are then retracted and the slurry lines and control cables are disconnected. 

  • A product pipe or casing is lowered into the shaft and inserted between the jacking frame and the MTBM or previously jacked pipe. 

  • ​Slurry lines and power and control cable connections are made, and the pipe and MTBM are advanced another drive stroke. 

  • This process is repeated until the MTBM reaches the reception shaft. 

  • Upon drive completion, the MTBM and trailing equipment are retrieved and all equipment removed from the pipeline.

  • Precise control of line and grade is accomplished using the guidance system and steering jacks to locate and steer the MTBM during a microtunneling drive.

Untitled design (45).png
Untitled design (46).png

Benefits of Microtunnelling

  • No dewatering of entire line required when working below the water table, dewatering only required in boring and receival pits.

  • Accurate to line and grade

  • Environmentally friendly

  • Reduces risk to the safety of workers and the public

  • Allows access to areas that aren't accessible via open cut trenching such as under railway lines, buildings, waterways, highways, trees and vegetation.

  • Reduces reinstatement costs particularly when large depths are required

  • Minimises traffic interruptions

bottom of page