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Important: The carrier materials must be impregnated with the resin as thoroughly as possible. The resin must be homogeneously distributed, without any visible air inclusions or defects. The impregnation of the lining tube is carried out either at the factory or on site. Factory Impregnation The lining tube is impregnated in the factory under controlled conditions, ensuring the highest quality standards. Depending on the resin used, the impregnated … |
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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:
The impregnation should be reproducible, factory-set, and independent of weather conditions. Impregnation on site (Image: Impregnation on site - Stacked … |
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The following table lists the quality influences during the manufacture of the lining tube on its load-bearing capacity, leak tightness, and functionality. (Table: Manufacturer-related quality influences during the assembly and impregnation of the lining tube [MUNLV05]) |
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The mechanical properties of lining tubes are influenced by the combination of carrier materials, wall structure, and resin matrix. Literature references to material characteristics of different types of lining tubes highlight these influences. For example, the expected flexural modulus of lining tubes with a wall structure made of glass fibres is approximately four times higher than that of those made from polymeric fibres. This demonstrates the … |
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Polymeric fibres felt tube also called needle felt liner 1. Internal membrane
2. Supporting laminate
3. External membrane or preliner
Glass fibre tube … |
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When installing the lining tube, a distinction is made between the inverted in-place insertion and winched-in-place insertion. Inverted in-place insertion (Image: Schematic diagram – Inverted in-place insertion) Inverted-in-place insertion is the insertion of the tube by turning it over. In this process, the inner side of the tube (impregnated with synthetic resin) is turned inside out before insertion. The inner surface of the tube, now covered with |
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Curing is the process of resin polymerization, which can be initiated or accelerated by heat (hot curing water or steam) or UV light. A combination of the curing techniques is possible. (Image: Lining with cured-in-place pipes – principle of heat-initiated curing (hot curing with water) ) (Image: Lining with cured-in-place pipes – principle of heat-initiated curing (hot curing steam)) (Image: Lining with cured-in-place pipes – principle of light-initiated … |
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The application of lining with cured-in-place pipes (CIPP) requires a thorough analysis and assessment of the stability of the host pipe-soil system. The structural stability of the object to be rehabilitated must allow for the insertion of the impregnated lining tube. Additionally, the hydraulic capacity must be maintained after the rehabilitation of the drain/sewer cross-section. CIPP lining can be applied in a diameter range from DN 100 to DN 2000 |
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(Table: Lining with cured-in-place pipes - areas of application [Steinb]) |
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Important: The application limits of the different methods are determined by the following boundary conditions:
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Feb 22, 2022 News Hunter Water Hunter Water is debuting an innovative new ‘keyhole’ technology for restoring damaged or degraded pipes in the Lower Hunter community.
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This figure illustrates the areas of application for the main types of rehabilitation. It clearly shows that both renovation and replacement impact at least one section of the sewer.
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(Image: Lining with cured-in-place pipes) The main group of renovation procedures is divided into:
The diagram illustrates the main rehabilitation groups and their associated process subgroups. (Image: Overview of the main processing groups for the strucural rehabilitation and maintenance of drains and sewers) |
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(Video: Lecture Video Lining with Cured-In-Place Pipes - processes) |
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Because of the extremely strong increase in the flexural modulus, the material table (right) in the DWA-M144-3 leaflet had to be extended three times between 2012 and 2016, whereby the short-term flexural modulus of the highest characteristic group in each case increased from a moderate 9,500 N/mm2 to an impressive 16,000 N/mm2 (see diagram). Since the flexural strength increased by only a much smaller percentage at the same time, the desired flexibility |
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(Image: Picto Nutzungsdauer Duration of Use Hydraulic Proof) Hydraulic proofs must be provided, e.g. in accordance with worksheet [DWAA110:2012]. Here, the inner diameters of the sewers rehabilitated with CIPP liner are decisive. Information on minimum wall thicknesses and thus on the internal diameters is given for example in [DWAM144-3:2012]. If knowledge of the hydraulic capacity utilisation of the system to be rehabilitated is already known, a reduction … |
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The table shows empirical values for use and application possibilities of CIPP liner. (Table: Empirical values for use and application possibilities of CIPP liner) |
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The execution of lining with cured-in-place pipes is presented in the following, divided into the process sections of preparatory work, installation work and final work. (Image: Schematic procedure for the execution of lining with cured-in-place pipes - Preparatory Work) (Image: Schematic procedure for the execution of lining with cured-in-place pipes - Installation work) (Image: Schematic procedure for the execution of lining with cured-in-place … |
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(Image: Schematic procedure for the execution of lining with cured-in-place pipes - Preparatory Work) Preparatory work
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The sewer sections to be lined must be completely shut down during the CIPP process. Incoming wastewater must be held back during this time without damage and must be diverted or transferred. The measures of the discharge control refer to the main sewers and the connecting laterals. When shutting off and bypass pumping the lateral house connections, the contractor must ensure that no impairment due to backwater in the basement rooms of adjacent residents … |
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The installation of bypass system shall not begin until all provisions and requirements have been reviewed and accepted. A bypass pumping plan should include at least the following aspects:
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