Microtunneling

Microtunneling

THIS TECHNIQUE USES A REMOTE-CONTROLLED GUIDED MICROTUNNEL BORING MACHINE (MTBM) TO LAY UNDERGROUND RIGID PIPELINES.

Microtunneling combines a pipe jacking technique with a remote-controlled boring or shield machine. The thrusting force is distributed by hydraulic jacks located in the MTBM front section and operated by a thrust ring.

Microtunneling can be used for underground pipe installation in any kind of geological conditions, even below groundwater, by means of a controlled-thrust, line and grade tolerance guaranteed system.

No personnel are required inside the tunnel.

Intermediate jacking stations allow lying long stretches of pipelines.

The MTBM has a continuous monitoring laser-guided system, which detects and corrects any online trajectory errors (by adjusting the thrusting force of the hydraulic jacks and of the directional drilling units located in the casing pusher).

Ground deformations are minimized or eliminated (which is made possible by the special drilling method used and the combined direct installation of the pipeline). By means of hydroshield, the ground deformation is avoided with slurry pressure in front of the shield.

Depending on the site-specific geological conditions, auger (e.g. EPB machine, open shield with punctual cutter or auger, for DN < 800 mm) or hydraulic spoil removal (slurry system) can be used.

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