Pipe Jacking or Tunneling is a trenchless technology method that uses a system to install prefabricated pipes directly behind a shield or tunnel boring machine. The pipes are installed by utilizing a hydraulic jacking force from the drive shaft.
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A tunnel boring machine (TBM), also known as a "mole", is a machine used to excavate tunnels with a circular cross section through a variety of soil and rock strata.They may also be used for microtunneling.
A tunnel is an underground passageway, dug through the surrounding soil/earth/rock and enclosed except for entrance and exit, commonly at each end. A pipeline is not a tunnel, though some recent tunnels have used immersed tube construction techniques rather than traditional tunnel boring methods.