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Nov 24, 2004 Rehabilitation and Maintenance of Drains and Sewers Renovation of Entry Manholes and Structures of Drain and Sewer Systems (Image: Manhole lining with pre-fabricated GRP pipe [NASSCO85a]) For manhole lining with short pipes (Abschnitt 5.3.2.2.2), use is generally made of pipes of plastics (Abschnitt 1.7.4), polymer concrete (Abschnitt 1.7.8), fibre cement (Abschnitt 1.7.9), or concrete and reinforced concrete with integrated corrosion protection (Abschnitt 1.7.7.3). The course of such a rehabilitation measure is as follows (Bild 5.3.3.1) [NASSCO85a] :
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Feb 16, 2011 Rehabilitation and Maintenance of Drains and Sewers Renovation of Entry Manholes and Structures of Drain and Sewer Systems This group of processes, in the case under application represented by the Flap-Lock Process, is based on the spiral lining process discussed in Abschnitt 5.3.2.3 [FI-Preus] [FI-RIBLOa]. The climbing rungs are removed, the projecting inlets are cut off flush and closed with sealing balloons and the whole manhole is cleaned. Then the 140 or 280 mm wide rib profile (Flap-Loc profile), which is cut to length, is manually wound around the circumference … |
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Nov 24, 2004 Rehabilitation and Maintenance of Drains and Sewers Renovation of Entry Manholes and Structures of Drain and Sewer Systems Site manufactured and hardened linings are based on the cured-in-place process mentioned in Abschnitt 5.3.2.4.1. A special development in this respect for lining manholes is the "Poly-Triplex Liner System" developed in the USA (Pat. Nos. 5,265,981, 5,940,744) [Haywa96] [FI-SunCo]. In this process, a multi-layer liner hose prefabricated to the dimensions of the manhole to be rehabilitated is soaked with epoxy resin and with an integrated non-porous … |
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Nov 24, 2004 The Permaform Manhole System [FI-Insit] [Wade91] [Haywa96] is one member of this group of processes. The non-self-supporting lining is anchored by means of T-ribs in a 50 mm to 70 mm thick beam cross section of in-situ concrete. A system steel shuttering is placed in the entry manhole (Bild 5.3.3.4.1) and this takes over the support of the corrosion protection layer and the poured concrete. Special shuttering elements permit the fabrication of this … |
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Nov 24, 2004 (Image: Lining a manhole with GF-UP plates [Siebe83]) The GRP segments used for this application case are 1.0 to 1.5 m wide, up to 4.0 m long and 5 mm thick. Although they can be cut, the same economical and problem-free working conditions apply as for the PVC-U rib plates. Also here large, regular surfaces should be available (Bild 5.3.3.4.2). In order for the GRP segments not to be sized for water pressure, a drainage felt should first be glued to … |
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Nov 24, 2004 Rehabilitation and Maintenance of Drains and Sewers Renovation of Entry Manholes and Structures of Drain and Sewer Systems These processes applied to the complete segmental lining of sewers (Abschnitt 5.3.2.5), can also be transferred to the lining of entry manholes and structures of drain and sewer systems (Bild 5.3.3.4) (Bild 5.3.3.4) [ATVM143-4b] [Zegwa].
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Nov 24, 2004 Rehabilitation and Maintenance of Drains and Sewers Renovation of Entry Manholes and Structures of Drain and Sewer Systems In-situ laminates, according to ATV-M143 Part 4 [ATVM143-4b], are understood to be linings with fibre-reinforced resin masses, whereby large-surface in-situ laminates are special cases. They are to be sized to be self-supporting and to be connected with fastening elements. An adhesive bonding with the pipe cannot be calculated. Sewer atmosphere and damp pipes make perfect technical connection difficult. The sequence of working steps in lining a concrete … |
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As with sewers, the renovation of entry manholes and structures of drain and sewer systems can be carried out by means of coating (Abschnitt 5.3.1), or lining in the form of prefabricated, site manufactured, as well as site manufactured and hardened pipes and also by lining with prefabricated elements and site laminations. All methods, except for the short pipe process, also permit the lining of manholes and structures with non-circular cross sections … |
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According to EN 752-5 [DINEN752-5:1995], renovation is understood to be measures aimed at improving the current functionality of sewage pipes and sewers under full or partial inclusion of their original substance. The measures used for carrying this out are (Bild 5) :
Renovation processes are applied to locally limited, repeated damage (Bild 5.6.1) as well as for extensive … |
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Mar 22, 2011 A comprehensive overview of the state of technology in the area of sewer rehabilitation and maintenance with an emphasis on pipe materials and joints, defect types, causes and consequences, cleaning and inspection as well as a detailed description of the full spectrum of technologies for repair, renovation and replacement of drains and sewers. |
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This lecture deals with the theoretical background of the topic of welding of polyethylene pipes, as well as the practical steps and limiting conditions that have to be considered. The aim is to outline the requirements that must be met for quality assurance and the consequences of non-compliance. |
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Congratulations! You have successfully finished this lesson. Next you will have the opportunity to review the newly acquired knowledge with an interactive questionnaire. You can of course still navigate back to any point in the lessons if you wish to review a specific point or subject. Stay curious! |
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Modern civilisation is no longer conceivable without functional sewage installations, e.g. installations for collecting, discharging, treating or disposal of sewage. In the interests of environmental protection and especially in the protection of water, the main activities of the past decades in Europe and especially here in the Federal Republic of Germany were in building of … |
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Protective handling of capillary pore materials that do not fill the inner pore system and do not form a surface film is called impregnation. When an impregnation hinders or makes more difficult the soaking of the surface of the structure with water and thus prevents the capillary suction of water, then one speaks of hydrophobic impregnation or, in short, of a waterproofing. Waterproofing is controversial as a stand-alone measure [Sasse94] and should … |
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Sealing forms a continuous surface film that protects the pipe from external influences in the sense of a coat of paint. The thickness of the film on even surfaces is between 0.1 mm to approx. 0.3 mm, but somewhat more in rough depths. On rough peaks (aggregate grains or burrs) it declines towards zero. By means of infusion into the near-surface pore structure, this film adheres to the pipe and effects at the same time a fixing of the pipe in the … |
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Film-forming coatings can consist of one or more layers. The type and quantity of the individual protective layers depends on the protective function, which result from the requirements and the loading [Sasse94]. |
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The determining value for the thinnest layer thickness of mortar coating, according to [DAfStBa] is 5 mm for reaction resin bound mortar, 10 mm for plastics modified mortar and 20 mm for cement bound mortar. Besides this, the thickness of the layer should correspond to at least three times the largest grain diameter. The respective required layer thickness depends on the aims that are being pursued as well as the type of damage. If the coating is … |
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An important differentiating feature of the coating process is the thickness of the coating. Thus there is differentiated (Bild 5.3.1.1) (Bild 5.3.1.1) (Bild 5.3.1.1) (Bild 5.3.1.1) :
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Nov 23, 2004
The basic idea of the model of mechanical adhesion, according to [Biker68], assumes that the fluid adhesive (coating mortar) hardens in the pores and hollows of the adherent (concrete pipe) and is there -mechanically - anchored like a wall plug or press … |
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Nov 23, 2004
The effective surface, as the sum of the contact surfaces between adhesive and solids, is the result of the wetting process. Under wetting (also dissemination) there is understood to include the adsorption and spreading of a fluid on a solid surface. Young [Young05] first reported on wetting experiments … |
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Nov 23, 2004 Polarisation theory: In addition to the thermodynamic method of observation of border surface energies with the aid of wetting measurements and border surface energy characteristics, de Bruyn [Bruyn39] first created a connection between adhesion appearances and the electrical reciprocal effects of molecular dipoles. He traces the appearances of adhesion back to a sufficient approximation between molecules of the adhesive and those of an adherent to … |
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Nov 23, 2004 (Image: Adhesive tensile strength between coatings without and with hydro-silicon content on mineral base [Sasse94]) With the availability of special spectroscopic analysis methods it has been possible since the 60's of the 20th Century to prove the existence of chemical adhesion bonds experimentally, especially between low molecular adhesives and adherents. To the adhesion bonds that have been experimentally proven several times, belongs the covalent … |
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Nov 23, 2004 |
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An important pre-condition for almost all the coatings carried out today is a fixed, powerful and durable bond to the pipe concrete. The creation of a bond rests on chemical/physical and mechanical processes that are defined as adhesion. Adhesion characterises the condition of the creation of a border surface layer between two material phases in contact. This condition is distinguished mainly in the cohesion of the participating phases, which are generated … |
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Nov 23, 2004 The requirements to be made of coating materials for mortar coatings depend on the loading to be expected for the individual case. A separation must always be made between:
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