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The following table lists quality influences during the manufacture of the lining tube on the 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 influence of the carrier materials or the wall structure and the resin matrix on the mechanical properties can be illustrated by means of literature references to material characteristics of different types of lining tubes (table). According to this, the expected flexural modulus of lining tubes with a wall structure made of glass fibres is approx. four times higher than that of polymeric fibres. The CIPP system shall have the minimum structural … |
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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 inside of the tube, which is then covered … |
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The application of lining with cured-in-place pipes requires a careful analysis and assessment of the stability of the host pipe-soil system. The structural stability of the object to be rehabilitated must allow the impregnated lining tube to be inserted. The hydraulic capacity must also be given after the rehabilitation of the drain / sewer cross section. The lining with cured-in-place pipes can be used in the 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 result from the following exemplary boundary conditions:
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This figure illustrates the areas of application of the main types of rehabilitation. It can be clearly seen that both renovation and replacement affect at least one sewer section.
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(Image: Lining with cured-in-place pipes) The main group of renovation procedures is divided into:
The diagram shows 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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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 … |
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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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Cleaning of the sewer sections to be renovated must be carried out immediately before the visual inspection and before the installation of the lining tube, usually by means of high-pressure cleaning. The cleaning procedures are to be selected in such a way that further damage to the host pipe is avoided as far as possible. The cleaning process must allow a perfect determination of the actual condition of the host pipe and remove any and all internal. |
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Directly before installation of the lining tube, a visual inspection of the sewer sections is necessary to check whether the pipeline is cleaned and free of obstacles. The results of the inspection are to be documented as a video on data media. Should significant deviations between the actual condition and the specified condition of the host pipe such as
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Obstacles must be removed before installing the lining tube. Obstacles are e.g. root ingrowths, projecting nozzles, deposits, incrustations, crossing pipes. Milling robots, for example, can be used to remove obstacles. Work to remove obstacles must be documented. (Image: Root ingress (BBA) - complex root system (C) in the pipe connection (A)) (Image: Root removed from a sewer) (Image: Root removal by use of a milling machine) |
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