Fold-and-Form: DN600 River-Crossing Sewer Rehabilitation in Zhejiang

The Challenge:

A routine inspection revealed a critical failure in a DN600 sewer line crossing beneath a riverbank in Zhejiang. The pipeline exhibited severe corrosion, misaligned joints, and multiple inverted bends exceeding 70 degrees - with one inspection chamber completely inaccessible beneath power conduits. As wastewater leaked into the river, the urgency for a non-disruptive solution became paramount.

Our Innovative Solution:

Facing extreme geometric challenges and environmental sensitivities, our team implemented a phased approach:

1. Precision spot repairs to immediately contain active leaks

   
   

2. Advanced fold-and-form thermoplastic lining that:

• Conformed perfectly to the 70° bends without compromising hydraulic capacity

• Created a seamless, structural renewal within the existing pipe

• Required zero excavation near critical infrastructure

Why This Matters:

This project demonstrates how modern trenchless technology can solve what were once considered "impossible" rehabilitation scenarios - particularly where:

• Extreme pipe geometries exist

• Environmental protection is crucial

• Traditional excavation isn't feasible

  
  

The restored pipeline now provides leak-free service with 50+ years of extended lifespan, all achieved without disrupting riverside traffic or nearby utilities.

See the breakthrough for yourself - watch our full case study video showcasing this engineering achievement.

Key features of Anyue Fold-and-Form liner:

• Maintains original flow capacity even at sharp bends

• Eliminates infiltration/exfiltration completely

• Suitable for DN100-DN1200 pipelines

• 50+ year design life

Visit here to learn more about Anyue Fold-and-Form lining technology or contact us via info@anyuetrenchless.com.