It’s common nowadays that most property owners prefer to use trenchless pipe rehabilitation procedures for sewer pipe repairs. Besides, in most of the time, pipe rehabilitation has no excavation, and even if there was one, it was too nominal to actually make a massive impact to the landscape. However, despite pipe rehabilitation being a more viable pipe repair application, it can’t be used all the time.
There are situations in which reinforcing the pipes is impossible through pipe rehabilitation since it’s too damaged, joint issues, structure problems, and many more. Sometimes a pipe replacement is the only option. There are trenchless pipe replacement methods that are not too destructive and don’t interrupt the surroundings near its work area–one of which is the pipe bursting method. Learn more on the whole process of pipe bursting below.
Step 1 Surveying the pipes
First of all, the pipes must first be surveyed by the contractor. They need a clear visual on the structure of the lining as well as the pathways of the sewer system. This can be done with the help of a recording footage or photos from a CCTV drain camera. Surveying the pipes is an essential part of the plan since it will give the contractors an overview of the whole sewer pipeline. This will help them plan on how and where to install the necessary tools and properly position the various machinery used for the operation.
Step 2 Excavating two entry holes
After the contractors are done surveying the pipes, they will be able to evaluate the video or photos and determine where to excavate the two holes that will serve as the entry and exit points of the pipe. Once they decided which area is the best location for the excavation, they will start digging. The excavation isn’t really that large-scale from what you would expect from a massive excavation, since the hole that is created is only large enough for the pipes to enter.
Step 3 Using the bursting or expander head
The next step is to destroy the existing pipe while simultaneously integrating the new pipe. In order for this to happen, the back part bursting head is affixed at the new pipe while the front section of the head is positioned in front of the pulling machine. The bursting head is smaller compared to the existing pipe so that it will be able to enter it with ease (it’s the hydraulic force that breaks the old pipes). Once everything is in place, the bursting head is pulled, bursting the existing the pipe while also dragging along the new pipeline.
Step 4 Confirmation of the success of the operation
After all the pipes have bursts, there is one last step and that is it confirm that the whole operation was executed properly and that there are no issues present. This can be done by placing the CCTV camera to check the outcome visually. There are other tests as well that check the integrity of the operation such as leak and pressure tests. If there are no issues with the inspections and tests, then the whole pipe bursting is completed and a success.