A glass fiber reinforced liner is impregnated with polyester or vinylester resin (at the production facility). The liner is pulled into the pipe to be rehabilitated via existing shafts (for larger dimensions using smaller construction pits).
The liner is then closed, put under pressure and cured with UV light. After curing, the system provides a structural liner which is comparable to a new pipe.
In the event of groundwater ingress preliminary sealing via punctual methods or the usage of a preliner is required.
A preliner must be used without fail as the resins must not come into contact with water. The liner is then closed, put under pressure and cured with UV light. After curing, the system provides a structural liner which is comparable to a new pipe. In the event of groundwater ingress preliminary sealing via punctual methods is required.
Fields of application:
- Non-pressurized pipes
- Sewerage and industry
- Dimensions between 150 mm and 1,500 mm
- Circular profiles, oval profiles
- Suitable for all pipe materials
- Bends and curved section rehabilitation possible (limitations are given)
- Installation lengths: up to 300m pipe length (depending on nominal dimensions and system).
Advantages:
- Short construction time
- No pipe connections
- Very flexible in application
- Insignificant cross-section reduction (twice the wall thickness of the liner pipe)
- Installation possible via existing shafts; depending on the situation the cone must be removed from DN 700 and a trench is required from DN 900.
- Shafts can be passed trough with the liner
- Lateral connection can be implemented from within
- No adhesion with the inner pipe wall - small remaining annular space, connections and shafts must be sealed additionallywatertight.
- The liner is hydraulically very smooth and resistant against aggressive waste water and mechanical stresses;
Disadvantages:
- Risk of folds is possible, particularly in the event of position deviation, nominal dimensions tolerances, bending, deflection and significant drift in the old pipe;
- Use of a preliner to prevent contact with polyester or vinylester resin contained in the liners (styrene is washed out on contact with water and curing is impossible)
- Due to preliner no adhesion to pipe inner wall - no remaining annular space
- Connections and shafts must also be sealed additionally to be watertight
- Wastes, in particular substrate material and residual resin, must be disposed of correctly
- Not suitable for damage such as pipe collapse
- Pipe manufactured on site – compliance with high quality standards required
