PIPE-JACKING
Pipe-jacking is a method of tunnel construction where hydraulic jacks are used to
directly install pipe by pushing the pipe through the ground behind a tunnel boring
machine or shield. The hydraulic jacks are located within a jacking pit where
the tunnel initially began. If the capacity of the main hydraulic jacking system is
incapable of supplying the force required to complete the drive, intermediate
jacking stations are used to supplement the main jacking system.