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Home > KOSUN News >
Introduction to trenchless pipe jacking.
Apr 10, 2025
Pipe jacking engineering is a trenchless underground pipeline construction technology, which is mainly used to lay or replace underground pipelines without damaging the ground structure.
The so-called pipe jacking is to use the jacking force generated by the jacking equipment (such as the main top cylinder, trunk, etc.)
in the working pit to overcome the friction between the pipeline and the surrounding soil, and push the pipeline into the soil according to the design slope.
The front end of the pipe is usually equipped with a tool pipe or a boring machine to break up the soil in front of it,
and the pipe is then gradually advanced until the pipe is buried between the two pits.
The so-called pipe jacking is to use the jacking force generated by the jacking equipment (such as the main top cylinder, trunk, etc.)
in the working pit to overcome the friction between the pipeline and the surrounding soil, and push the pipeline into the soil according to the design slope.
The front end of the pipe is usually equipped with a tool pipe or a boring machine to break up the soil in front of it,
and the pipe is then gradually advanced until the pipe is buried between the two pits.
The role of mud in pipe jacking
In jacking construction, mixing mud (generally containing bentonite, carboxymethyl cellulose CMC,
water, according to a certain proportion of the formation) is injected into the outer wall of the pipe joint to form a mud jacket and reduce the friction resistance between the pipe wall and the soil.
In the process of conveying and filling, the mixing mud has fluidity, which is gelatinous or paste, and plays the role of lubrication and drag reduction.
After a certain standing time, the mud consolidation is gelled and has a protective effect on the soil .
When the pipe joint is jacked, the mud is disturbed and then formed into a gel or paste, and the process repeats throughout the whole jacking process.
water, according to a certain proportion of the formation) is injected into the outer wall of the pipe joint to form a mud jacket and reduce the friction resistance between the pipe wall and the soil.
In the process of conveying and filling, the mixing mud has fluidity, which is gelatinous or paste, and plays the role of lubrication and drag reduction.
After a certain standing time, the mud consolidation is gelled and has a protective effect on the soil .
When the pipe joint is jacked, the mud is disturbed and then formed into a gel or paste, and the process repeats throughout the whole jacking process.
