Definition - What does Grout-in-Place Pipe mean?
Grout in place pipe is a trenchless method of sewer pipe rehabilitation that involves the use of a high density polyethylene liner (HDPE) fabric that is placed at the damaged part of the pipe and grouted into place. Trenchless methods of rehabilitation have made it easier to repair pipes compared to the traditional methods that requires opening up an entire section of pipeline even to detect the source of a leak. Often an entire section of pipes is required to be changed. Grout in place pipes eliminates that requirement by helping to repair the damaged part from a manhole.
Trenchlesspedia explains Grout-in-Place Pipe
The process of grout-in-place begins with determining the exact location of the damage. Once it is pinpointed, one or several HDPE hoses according to the cross section of the pipe are inserted into the host pipe using a cable winch. Using pressure the outer wall of the liner that is fitted with studs is pressed to the inner wall of the host pipe. These studs are provided to define the annular space between the liner and the host pipe, anywhere between 9 to 19 mm. A hydraulically setting grout is inserted into the annular space by injection grouting and allowed to set. The grout fills in any cracks or gaps that it finds in the old pipe, forming an effective seal.