Pipe Jacking
Pipe Jacking, generally referred to in the small diameters as microtunneling, 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
As pioneers and leading exponents in pipe jacking, we are able to offer technical advice, budgets, and accurate feasibility exercises. To date many kilometres of pipeline have been installed by the company in a wide range of ground conditions varying from soft sand to solid rock requiring blasting.
It is an essential pre-requisite for any potential pipejack to complete a thorough study of the prevailing geology to be made available to all interested parties at an early stage. This is the only way of ensuring a cost-effective solution to any given problem.
The Pipe Jacking Technique
Pipe Jacking, or micro-tunneling, is a technique for installing underground pipelines, ducts and culverts without the use of open trenches. 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 technique ensures a structural sound and watertight finished pipeline. There is no theoretical limit to the length of individual pipe jacks although practical engineering considerations and costs may impose restrictions.
Drives of several hundred metres either in a straight line or to a radius are routine have been completed by Jacked pipelines. 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.
The Benefits of Pipe Jacking
Minimal surface disruption
No risk of settlement in 90% of crossings
Reduced requirement for utilities diversions in urban areas
Smooth internal finish giving good flow characteristics
No requirement for secondary lining (HDPE lined pipes are available for sewers)
Considerably less joints than a segmental tunnel
Provision of invert channels in larger pipes to contain the dry weather flow of a sewer in a combined system.
Virtually maintenance free construction
Significant reduction in social costs when compared to open cut trenching in urban areas
Reduced environmental disturbance
Inherent strength in the pipe lining
Latest Projects
KD Civils Zithobeni Bronkhorstspruit
Mozambique PSA Well Pad Surface Facilities Flowline
