Trenchless Technology: Microtunneling and its use in road construction projects
Microtunneling is a trenchless technology that is a subcategory of the traditional Jack and Bore method with a couple significant differences.
While microtunneling still utilizes pipe jacking
fundamentals, it is typically remote controlled and requires no personnel entry
into the bore path. Further, Microtunneling provides continuous support to the
excavation face via a fluid-based slurry, along with a spoil removal system.
This support system also controls erosion at the point of the tunnel face,
which can be a primary cause of undesired surface settlement. Due to the
presence of microtunneling’s closed system and specialized cutting face,
microtunneling is unable to handle soils with cobbles, boulders or obstructions
> 4 inches, but the same features make it well suited for soft or wet soils.
Early engagement of a licensed attorney is recommended if changed conditions are encountered during the performance of microtunneling work.
See OCL’s May 1, 2019 Blog Post for a description of Jack and Bore method.