Project Overview

        The Inspection and Repair Project for Rainwater and Sewage Pipelines in the Reconstruction Project of Huancheng North Road (from Renmin Road to Changhong Tunnel) in Ningbo City is located in Jiangbei District, Ningbo, stretching westward from Renmin Road to Changhong Tunnel in the east. According to the CCTV inspection report, the quantities of trenchless repair works adopted in this project are as follows: 60 stainless steel double-expansion rings for DN1500 pipelines, approximately 400 meters of UV light curing repair for DN700 pipelines, approximately 300 meters of UV light curing repair for DN800 pipelines, and approximately 200 meters of UV light curing repair for DN900 pipelines.

Before and after the repair, CCTV inspection is conducted on the repaired pipelines to generate inspection reports.

Detail drawing of expansion ring repair.

Comparison images before and after double-expansion ring repair.