Microtunneling is a process that uses a remotely controlled Microtunnel Boring Machine (MTBM) combined with the pipe jacking technique to directly install product pipelines or casing underground in a single pass. Huxted has perform microtunneling services for the following applications.
With years of Microtunneling history, Contractors have now developed means and methods that allow long drives (tunnels) to be constructed. Drive lengths in excess of 3000 feet have been completed, including those with curves. Most of these are in pipes larger than 36 inches in diameter. These longer drives allow for crossing larger bodies of water, environmental sensitive areas or simply to minimize road or urban disruption.
Intakes & Outfalls With Underwater Recovery
Marine / River Crossings
Since the microtunneling machine provides hydrostatic counterbalance while under operation or not, the microtunneling method is typically used in the construction of pipelines under rivers, creeks, streams, bays, etc. as the soil underneath these marine environments are usually wet and fully saturate due to the hydrostatic contact of the marine body that is being crossed.
Cost Effective / Environmental Crossings
Most environmentally sensitive areas are typically wet lands. Since the microtunneling machine provides hydrostatic counterbalance while under operation or not, the microtunneling method is typically used in the construction of pipelines under environmentally sensitive areas. As the soil underneath these marine environments are usually wet and fully saturate due to the hydrostatic contact of the marine body that is being crossed. In addition, the microutnneling machine is an earth pressure balance machine, thus protecting the hydrostatic conditions and preventing settlement and/or heave of the surface.
The microtunnel operation can install thousands of feet of pipe working out of one, relatively small location, as compared to the open cut operation, that requires large areas of disturbance, including complete lane closures, traffic detours, noise and dust issues. Therefore the microtunneling method is more friendly to the community, the public and the environment.
Railroad / Highway Crossings
Microtunneling was originally designed for the installation of sanitary sewers, as such, the pipeline can be installed to a tight tolerance. This is helpful with projects that require very sensitive grades or have underground obstacles to avoid.