Qingyuan Technology has independently developed and implemented the Steel-Plastic Composite Reinforced (Stationary) Mechanical Spiral Wound (MSW) trenchless rehabilitation technology. This method allows for onsite fabrication of liners in various diameters and specifications to rehabilitate target pipes. This technology was developed through in-depth research into material formulation, equipment/mold improvement, and the optimization of PVC profiles and steel strip structures. This process involves using PVC profiles with a double-locking mechanism to wind a new pipe inside the old one in a spiral form. Grout is then injected into the annular space between the host pipe and the liner to form a high-strength composite structure. Application: Suitable for large-diameter pipe rehabilitation. Diameter Range: DN600mm – DN2600mm.

Equipment Components: Stationary mechanical winding machine, hydraulic power unit, U-PVC profile decoiler, profile feeding device, steel strip pressing equipment, grouting equipment, power generators.

The stationary mechanical pipe-fabrication machine is introduced into the roadside manhole through a component-based assembly process. Factory-prefabricated U-PVC profile strips and steel bands are transported to the construction site and fed into the manhole. Driven by a hydraulic power unit, the pipe-fabrication machine operates within the manhole to spirally wind these materials into a brand-new, continuous pipe inside the existing pipeline designated for rehabilitation. Finally, a grouting treatment is performed to fill the annular space between the existing host pipe and the newly formed one, creating a high-strength composite pipe system that achieves the intended objective of structural reinforcement and full rehabilitation.

Repair Construction Animation

—  Large Diameter Compatibility: Suitable for DN600–DN2600 pipes (reinforced concrete, steel, plastic, etc.).

—  Live-Flow Operation: Suitable for installations with water levels up to 70cm and flow velocities up to 1m/s.

— Small Footprint: Utilizes existing manholes for access; no large excavation or extensive working pits required.

—  Operational Flexibility: Construction can be interrupted and resumed at any time. Minimal Traffic Impact: PVC profiles can be cut or reconnected easily, allowing for flexible scheduling and phased construction to minimize social and traffic disruption. (Ideal for emergency repairs, rain, or temporary road reopening)

—  Structural Reinforcement: Forms a "pipe-within-a-pipe" with grouting to reinforce aging infrastructure.

—  Stable Quality: Prefabricated profiles from the factory combined with onsite mechanical winding ensure consistent quality.

—  Seismic Resistance: The mechanically wound pipe possesses an inherent seismic resilience.

— Cost-Effective: Superior to open-cut methods, saving on both investment costs and project duration.

Double-lock PVC Profile Strips and Stainless Steel Reinforcement Bands

External Wall of Mechanical Spiral Wound Pipe

Mechanical Spiral Wound Winding Cage

Mechanical Spiral Wound Pipe Lining (SPL) Equipment

Mechanical Spiral Wound Winding Cage

Internal Wall of Mechanical Spiral Wound Pipe

account：+86 180 43111 3436

No. 35 Caoli Road, Jinshan District, Shanghai, China