The patented technique for laying cables or cable conduits in already existing, walkable and non-walkable pipelines has established from trenchless pipe rehabilitation techniques. Tube liner systems have been used for trenchless rehabilitation of leaky pipes for more than 40 years. In combination with additional tools, this method can also be used to lay modules that integrate cables or cable conduits.
How it is done:
A tube is being inversed from one side, just like it is done during a pipe rehabilitation. The procedure happens whether by an inversion drum with air or by the addition of water. A long module, more precisely a resin-impregnated felt tape, which contains corresponding cable protection tubes, lies in the tube. Next, a robot respectively a channel camera with a laying appliance, raises the module and places it at the requested position. Then the hose presses the module against the wall and moves forward by increasing the pressure. At the same time, the camera moves backwards and positions the felt module. The speed of the hose and the camera are controllable. One of the main advantages of this process is that the modules can be placed exactly where they are needed. Since the cable ducts are not rigid, but flexible, it is also possible to bypass all inlets in the pipeline if necessary, by turning the laying device. By adding warm water, the resin hardens into the thermowells after the successful installation. Then the hose is removed, whereas the module with the cable protection pipes sticks to the pipe wall. After drying, protective pipes can be fitted with fiber optic cables, by blowing in.
With this patented method, cables are laid in the top, as well as in the bottom of the pipes.
The process can basically be used wherever pipe liner renovations are carried out, for example in sewers, water pipes and gas pipes.