In the past few decades, a lot of pipe repair and replacement methods have sprung out. Most of these methods use trenchless technology, a specialised pipe repair in process in which excavation is kept a minimum. Sliplining is one of the select trenchless pipe rehabilitation methods. In pipe rehabilitation, the sewer line is repaired or refined by inserting a new pipe or pipe-like liner into the old pipes. This article will take a look on how the sliplining process is done.
Examining the condition of the current pipes
This can be done by putting a closed-circuit television (CCTV) camera inside the pipes. By recording footage or taking the pictures, the repair contractor will be able to visually inspect the pipes without needing to excavate the pipes. Aside from examining the condition of the inner lining of the pipes, there are also things that should be checked like the: offset pipe sections, collapsed and crumbled pipes, tree roots, and other debris-causing clogs. The examination will also help determine if sliplining is indeed applicable for the current condition of the pipes.
Removing the cause of blockage or excavation of severely damaged pipes
If the camera inspection showed any form of blockage then it must be taken out. Sand, grime, slime, roots, and small crumbled pipe sections can be cleared out with the use of a hydro jet. If there are gigantic roots, then a machine cutter is more appropriate. Contractors must make sure that the current pipeline is free from clogs and clean is an absolute necessity for the success of the sliplinig procedure.
Fusing the pipe
Polyethylene pipe is commonly applied in sliplining because of its durability and versatility. There are different types of Polyethylene pipes, and its classification will determine what kind of fusion method will be used. Popular polyethylene pipes that are applied in sliplining are the solid wall or the Polyethylene profile pipe. There are mainly two types of fusion techniques that are used. These are butt fusion technology or the gasketed bell and spigot joint method.
Creating an entry pit
In order for the Polyethylene pipes to be inserted, an entry pit must be created. Manholes are theoretically entry pits but a new and modified one is needed to ensure that the pit gap will adhere to the sewer line and the pipe that is about to be inserted. If the sewer pipe system is big, then a large entry pit must be created.
Inserting the Polyethylene pipes
After the entry pit is made, the Polyethylene pipes are finally inserted into the existing old pipeline. The Polyethylene pipe can be either pushed or pulled through with the use of a winch equipment. Gasket-joint Polyethylene profile pipes are usually pushed into the pipe section while solid wall pipes can be either push or pulled. After the pipes are inserted, one final inspection is done to investigate any errors with the installation. If there are any miscalculations or mistakes, then the contractor must be able to make adjustments to ensure that the sewer system is operational and in top condition.