Fold-and-Form: Minimal-Disruption Trenchless Rehab in a Historic Scenic Area

Project Overview & Challenge

During a routine inspection at a national 3A-level scenic spot in Zhejiang, China, underground sewage leaks were detected within a main utility trench. The leaking DN200–DN300 corrugated pipes threatened both the local ecosystem and the visitor experience, making immediate renewal critical. However, open-cut excavation was strictly prohibited as the pipeline ran beneath historic blue-stone pavements.

The project presented extreme spatial and logistical challenges: the 400-meter pipe network sat inside a confined 1400mm*1100mm underground trench packed with live utilities.

Additionally, narrow alleyways forced support vehicles to park over 100 meters away from the entry points. To protect local businesses and heavy daytime tourist traffic, the work required temporary bypass pumping and overnight execution.

The Solution & Execution

To overcome these site constraints, Fold-and-Form PVC Lining was selected as the optimal trenchless solution.

After clearing the existing line and installing new PE inspection chambers, the flexible Fold-and-Form liner was pulled through the narrow trench over a 100+ meter setup distance. Once in place, the liner was heated and pressurized to expand, forming a seamless, structural pipe within the host line.

Key Results & Value Delivered

• Zero Surface Disruption: Fully restored the 400-meter sewage network without disturbing historic stone pavements or the surrounding landscape.

• Uninterrupted Tourism: Overnight operations and temporary bypass systems allowed daytime tourism and local commerce to run smoothly without interruption.

• Superior Long-Distance Capability: Successfully proved Fold-and-Form’s performance in tight, hard-to-reach locations where traditional trenchless methods could not operate.

📧 Contact Us for Trenchless Liners & Equipment Support:

• Email: info@anyuetrenchless.com