There are 3 categories of trenchless repair technologies for
steel pipelines (including more than 10 process technologies)
First is to use the resin curing method to form a new drainage
steel pipeline inside the
steel pipeline, such as CIPP, on-site curing, and other processes;
The second type is to use the small pipe through the large pipe, and set a small drainage pipe inside the original pipe to solve urgent needs, such as short pipelining, U-shaped pipe dragging, and other processes;
The third type is to use the spiral pipe method to form a new pipe inside the original pipe by winding method, such spiral winding method, etc.
