How Does No-Dig Excavation Work?
As a sophisticated and less intrusive method for repairing underground pipes, no-dig excavation consists of a meticulous process:
- Initial Inspection
The process begins with a thorough inspection of the damaged pipe. This is usually done using CCTV camera equipment, which is inserted into the pipe to provide a clear view of its condition and to identify the exact location and nature of the damage
2. Cleaning the Pipe
Before any repair work can begin, the pipe must be cleaned. High-pressure water jetting is used to clear away any debris, roots, or blockages. This ensures that the interior surface of the pipe is clean for effective repair.
3. Pipe Lining Preparation
In the case of pipe lining, a resin-saturated liner is prepared. This liner is made to fit the diameter and length of the damaged pipe. The resin used is often a type of epoxy or polyester that hardens to form a new pipe within the old one.
4. Inserting the Liner
The prepared liner is then inserted into the pipe. This can be done using various methods, such as inversion (using water or air pressure to invert the liner into place) or pulling the liner into position using mechanical means.
A Step-by-Step Guide
5. Inflating and Curing the Liner
Once the liner is in place, it is inflated to fit snugly against the walls of the existing pipe. The resin is then allowed to cure, which can be expedited using hot water, steam, or UV light. This curing process hardens the resin, effectively creating a new, seamless pipe within the old one.
6. Quality Check
After the resin has fully cured, another CCTV inspection is conducted to ensure that the liner has been set correctly and that the repair is complete and effective.
7. Re-connecting and Final Testing
If any lateral connections were covered during the process, they are reopened using robotic cutters. Finally, the repaired pipe is tested to ensure it is fully functional and leak-free.
The no-dig excavation process is valued for its efficiency and minimal disruption, offering a robust solution for pipe repair without the need for extensive digging and the associated costs and inconveniences.