Injection Grouting

Published: July 30, 2017 | Last updated: July 5, 2023

What Does Injection Grouting Mean?

Injection grouting is a method used to fill in cracks, gaps, annular spaces and joints between old piping and new pipe, or a liner, as well as voids in the surrounding soil. injection grouting is not a structural pipe repair method. It is used in conjunction with repair methods to fill gaps and voids.


Trenchlesspedia Explains Injection Grouting

Injection grouting involves the use of two special water based chemicals that are pumped under pressure at the point of entry. Damaged pipe is first cleaned and inspected using a CCTV camera to detect other damaged areas. With the help of CCTV cameras, Inflated packers are brought into place to localize the section to be grouted. Grout is then fed into the packers. As pressure is applied, the injection ports in the packer force the chemical mix into the voids and gaps by forcing out the accumulated groundwater. The grout also helps stabilize the surrounding soil. The grout gel has a predetermined setting time and forms an impermeable seal.


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