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Pipe Jacking

A system of directly installing pipes behind a shield machine by hydraulic jacking from a drive shaft such that the pipes form a continuous string in the ground. Excavation is performed manually or mechanically with the use of a tunnel boring machine (TBM).

Pipe Jacking is a special tunneling method for installing underground pipelines with the minimum of surface disruption. Primarily used for new sewer construction, it is also used for sewer replacement and relining, gas and water mains, oil pipelines, electricity and telecommunication installations, culverts and subways.
Pipe jacking, generally referred to in the smaller diameters as microtunnelling, is a technique for installing underground pipelines, ducts and culverts. 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.
There is no theoretical limit to the length of individual pipejacks although practical engineering considerations and economics may impose restrictions. Drives of several hundred feet either in a straight line or to a radius are routine. A number of excavation systems are available including manual, mechanical and remote control. Pipes of various sizes can be installed by employing the appropriate system. Construction tolerances are compatible with other tunneling methods, and the pipe jacking method generally requires less over break than segmental tunnels, providing better ground support.

Walter C. Smith Co. has developed an expertise in pipe jacking, completing numerous jobs throughout California. Our engineers can tell you if this method of installation would be best for your project. Contact us at (559) 299-9727 or e-mail us at This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

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