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(Image: Icon: Recht)
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(Image: Picto Lining with cured in place pipes) In the lining procedure with "cured-in-place pipes” also known as CIPP, a prefabricated, flexible tube (lining tube) made of carrier and possibly reinforcing material, which may be equipped with internal or external membranes (foils/coatings), is inserted into the sewer section to be renovated and pressed against the inner wall under pressure. There it hardens to a self-supporting liner through the reaction … |
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The rehabilitation objectives applicable to “lining with cured-in-place pipes " (hereinafter also referred to as CIPP) generally correspond to those of lining techniques. The following table specifies these rehabilitation objectives: (Table: Rehabilitation objectives and requirements for lining techniques) |
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Durability in the narrower sense of the term is the resistance of the CIPP liner to external, foreseeable influences during its service life. The proof of durability can be provided by performance tests or on the basis of practical experience and long-term observations. Important: Currently, the economically reasonable service life that the CIPP liner must provide without repair costs is set at 50 years. Prerequisite: all tests for the CIPP product … |
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The CIPP liner is a composite system consisting of one:
Further components … |
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Internal membrane (foil or coating) is the separating layer that forms the inner wall of the CIPP liner after installation. External membrane (foil or coating) is the separating layer that forms the outer wall of the CIPP liner after installation. Inner and outer membranes usually consist of:
During installation, it must be … |
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The resins used for the CIPP are classified as duromers, as they consist of closely cross-linked polymers (macromolecules). They are considered insoluble, slightly swellable and chemically very resistant. They therefore fulfil the basic requirements for use in the field of sewer rehabilitation. The cured resin has a decisive influence on the deformation resistance and load-bearing capacity of the CIPP product. Duromers (also called thermosets), are … |
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For the lining tube, unsaturated polyester resins (UP), epoxy resins (EP) or vinyl ester resins (VE) are generally used. The resistance of the resin systems must be proven by their suitability for use in the municipal sewage sector. Only resin systems that are hydrolysis-resistant and insensitive to moisture in the cured state are to be used [DWAA143-3:2014]. Pigmentation to control mixing and/or resin impregnation is permissible. When selecting the … |
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EP resins are mainly used for lining tubes in the field of house connection renovation and are often coloured (blue, purple, ...). Lining tubes for house connection renovation are not the subject of this module. (Image: Lining tube for house connection renovation with dyed EP resin (pink)) (Image: Lining tube for house connection renovation with dyed EP resin (blue)) |
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(Table: Resin systems used for cured-in-place lining [Steinb]) |
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The polyester resins (UP), epoxy resins (EP) or vinyl ester resins (VE) listed in the table are preferably used. The composition of the resin systems used must be described in the suitability certificate. (Table: Preferred resin types [DWA-A143-3]) |
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With the exception of epoxy resins, the curing of the resin is triggered by different initiators. A distinction is made between thermal initiators and photoinitiators. Thermal initiators are required for curing with steam or warm water, whereby a combination of a low-temperature and a high-temperature initiator is usually used. Photoinitiators are used for light curing. It is possible to equip lining tube with thermal and photoinitiators at the same … |
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UP and VE resins are dissolved in a reactive diluent, mostly styrene. Initiators are added to the UP and VE resins for curing. These are peroxides for heat curing and light initiators for UV light curing. [ZKS-Hein] In a certain temperature range or when irradiated with ultraviolet light, the initiators release radicals that initiate the polymerization process, i.e. the polyester or vinylester chains are crosslinked with the styrene present in the … |
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The curing of EP resins is not a polymerisation but a polyaddition. Here special hardener systems (2 components - resin + hardener) are used, which already cure at ambient temperature. This ambient cure can be accelerated or controlled by adding heat. Due to the direct reaction of the EP resin on contact with the hardener, only impregnation of the lining tube on site is possible (see pictures). (Image: Mixing of epoxy resin) (Image: Filling the lining … |
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(Image: Carrier material neu) The carrier materials are processed into tubes and, after impregnation with the respective resin system, form the complete system (lining tube). They can essentially be divided into two groups: Polymeric fibres (needled felt) and glass fibres fabric (e.g. corrosion-resistant E-CR glass). In some cases, combinations of the two aforementioned systems are also used. (Table: Carrier materials based on [Siebe03]) |
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Carrier materials usually consist of: Polymeric fibres (also called synthetic fibre felt / polyester needle felt)
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Carrier materials usually consist of: Glass fibres
When using glass fibres … |
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Only textile fibres free of softeners may be used. The seam or overlap areas of the carrier material must not impair the properties of the lining tube. In the case of lining tubes with a multi-layer structure of the carrier material, joints or overlaps must be offset (staggered). (Image: Carrier material - Test sample of a polymeric fibre CIPP (ohne metadata)) (Image: Carrier material - Test sample of a glass fibre CIPP (ohne metadata)) |
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Important: The carrier materials must be impregnated with the resin as completely as possible. The homogeneous distribution of the resin must not show any visible air inclusions or defects. The impregnation of the lining tube is carried out at the factory or on site. The factory impregnation: The lining tube is impregnated in the factory under controlled conditions. The factory impregnation enables the highest quality standard. Depending on the resin … |
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Impregnation of the lining tube at the construction site should only be carried out in mobile facilities that meet the following requirements or contain equipment:
Impregnation on site (Image: Impregnation on site - Stacked … |
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