Micro-tunnelling is a trenchless method used to install pipelines without the need for open trench excavation. This specialized method is typically used for installing pipelines under roads, railways, or other obstacles. Here’s a general overview of the process:
SITE PREPARATION:
The first step in micro-tunnelling is to prepare the site for the installation. This involves Mainline’s team of experts identifying the location and depth of the pipeline and marking the
entry and exit points.
TUNNELLING EQUIPMENT SETUP:
Once the site has been prepared, the micro-tunnelling equipment is set up. A secure and safe launch and reception pit is constructed to support the launch rails and jacking equipment.
PIPE INSTALLATION:
A pipe string is inserted into the launch pit and connected to the micro-tunnelling machine. The machine then pushes the pipe string through the bore path, excavating the soil or other materials with the use of mechanical or fluid material conveyancing systems. As the pipe string is pushed through the borehole, the pipe jacking system provides the necessary thrust to push the pipe into the ground. The jacking force is usually provided by hydraulic jacks that are connected to the pipe string.
PIPE CONNECTION AND GROUTING:
Once the pipe string has been pushed through the borehole, the individual pipe sections are connected to form a continuous pipeline. After the pipe has been installed, the annular space between the pipe and the surrounding soil is typically grouted to provide additional stability. Micro-tunnelling is a relatively fast and cost-effective method of installing pipelines without disrupting surface traffic or infrastructure.
| Requirement | New Underground Service Installation |
|---|---|
| Specialist Service Offering | Micro-Tunnelling |
| Miscellaneous Civil Works | |
| Foul Sewer / Stormwater / Sleeve | |
| Water / Gas | |
| Size Limitations | 900mm - 1200mm |