Pipe Jacking

Pipe jacking is a general technique of the installation of pipes with a tunnelling shield in front and the pipes are jacked from a jacking pit to a receiving pit. The term pipe jacking can be used to describe a specific installation technique as well as a process applicable to other trenchless technology method. Powerful hydraulic jacks are used to push specially designed pipes through the ground behind a shield at the same time as excavation is taking place within the shield. The method provides a flexible, structural, watertight, finished pipeline as the tunnel is excavated.

Construction tolerances are comparable with other tunnelling methods, and the pipe jacking method generally requires less over break than alternative systems. It provides ground support and reduces potential ground movement.