How it Works: Non-Restrained Joint
Sectional pipe with non-restrained joints, however, requires a little different approach. Because the joints are not restrained, something needs to hold to push them together and then hold the assembled pipe sections in compression as they are installed. Quicklock style bursting rods and a specially designed cylinder pack provide the solution. As a new section of pipe is added to the pipe string, the cylinder pack (squeezer) and pressure plate push and hold the pipe joints together while the bursting head is pulled forward through the old pipe. Once that section of pipe is installed, the bursting process stops, the cylinder pack and pressure plate are withdrawn and the process repeats.