Talking Trenchless

This Phoenix, Ariz., sewer project is one of the largest-diameter VCP static bursting projects to date. It involved bursting and replacing 3,938 feet of existing 12-inch VCP with 18-inch VCP. Photos: TT Technologies

During the static bursting process, bladed rollers attached to bursting rods are pulled through an existing line by a hydraulically powered bursting unit (inset). As the bladed rollers are pulled through, they split the host pipe. An expander attached to the rollers forces the fragmented pipe into the surrounding soil while simultaneously pulling in the new pipe. The trench shown is shallow enough to require no shoring.

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