Rehabilitation Using Steel-Plastic Composite Reinforced Spiral-Wound Pipe

This technology utilizes a stationary mechanical spiral-winding process to perform trenchless rehabilitation by creating a new liner pipe inside the target pipeline.

It is a trenchless rehabilitation method employing a stationary mechanical spiral-winding system. The process involves winding PVC profiles—interlocked via a dual-locking mechanism—inside the existing pipe to form a new pipe, followed by grouting the annular space between the old and new pipes to create a composite structure. It is suitable for large-diameter pipelines, covering a range of DN600 to DN2600 mm.

The equipment suite primarily consists of a stationary mechanical pipe-winding machine, a hydraulic power unit, a PVC strip supply reel, a strip handling/feeding mechanism, steel strip forming equipment, and a grouting system.

The stationary pipe-winding machine is assembled and lowered into the manhole. Factory-prefabricated PVC strips and steel strips are transported to the site and fed into the manhole, where the hydraulic power unit and winding machine spiral-wind them into a new pipe within the existing pipeline. Finally, grout is injected into the space between the existing pipe and the new pipe, creating a composite structure that reinforces and rehabilitates the pipeline.