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.