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Nov 23, 2004 According to [ATVM143-5b] [ATVM143-3] and similarly to [Gütes96], tests and own supervision must be carried out wherever the quality of the rehabilitation can be negatively influenced. These can be, for instance:
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Nov 23, 2004 (Image: Measures for the relief of the liner over-extended during pulling-in in the channel region of the manhole [Holst84]) The finishing work comprises in addition to testing (Bild 5.3.2.2) :
According to [ATVM143-5b], a leaktight and hydraulically advantageous transfer from liner to the manhole wall and the channel must be created. This manhole connection … |
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Nov 23, 2004 Four to six persons are required for carrying out the conventional sliplining process without taking account of the excavation work. The special equipment includes the following:
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Nov 23, 2004 (Image: Ovoid cross section with two inliners of different nominal sizes above each other) The conventional sliplining process offers the following advantages:
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Feb 16, 2011 Modifications to the conventional sliplining process refer mainly to the structure of the pull head under the aspect of simplifying the grouting of the annular space and to remove flow obstacles in the section of the sewer to be rehabilitated within the scope of the relining measures. The first named aim, for instance, can be met with a modified horizontal directional drilling process in the nominal size range DN 75 to DN 250 [Kleis96b]. In the first … |
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The conventional sliplining process (in the German literature also often referred to as "Rohrstrang Relining") was developed in the 60's of the 20th Century in Canada as the "Bremner Process" [Bremn71] [Bremn81] [Gale81b] [Quele81] [Cox81] [WPCFFD6] [Glenn82] [NASSCO85a] [WPCF85] [NASSCO85b] [Schro85] [WRC84a] [Stein89c] [Ewert91] [Stein86e] [Stein87e] [Stein87f] [Stein88f] [Stein88h] [Stein91c] ; it is standardised in the USA [ASTMF58594]. In this … |
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In contrast to the conventional sliplining process, the patented (pat. No. 3501620) Thermoline process introduced into the Federal Republic of Germany in 1990 manages without the usual creation of an insertion excavation [Kutti90] [FI-Sewera]. The prefabricated HD-PE continuous pipe is inserted via the manhole into the section of the sewer to be rehabilitated. This is achieved by the flattening of the pipe that has been heated to approx. 70° C and … |
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Feb 16, 2011 After the cleaning and calibration of the sewer to be rehabilitated, the pipes are pulled through entry manholes or revision openings with the aid of a winch (Abschnitt 5.3.2.2.1.3.1) (Bild 5.3.2.2.1.3.1) (Bild 5.3.2.2.1.3.1). The digging of an insertion excavation is not required and taking the section of the sewer out of operation is generally not necessary. A pull head is attached to the end of the continuous pipe in order to make the pulling-in … |
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Nov 23, 2004 (Image: Corrugated pipe method: Section through the branch connection region with simultaneous rehabilitation of the sewer and laterals [FI-Upono]) In this process, too, the laterals are connected to the liner in a special working step by the open cut or trenchless method. With the open cut method, this occurs, as already mentioned above, conventionally by exposing the affected pipe piece in a head excavation and installing special transition sockets … |
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A further representative of the sliplining process is the corrugated or spiral pipe process [FI-Upono], which the manufacturer of the special three-layer pipes (Bild 5.3.2.2.1.3) has designated as the "Flexoren Process". The liner obtains the required ring strength achieved through the ribbed HD-PE outer layer. The smooth intermediate layer is based on a mixture of EPDM/PEM and, together with the bond with the outer layer, provides good flexibility. … |
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Feb 16, 2011 The deformation process with PE liners differs markedly through the time period of the deformation of the sliplining. This deformation can occur during extrusion or in a separate work step at the factory and also immediately before the insertion in situ. Representatives of this process group, for instance, are:
In the U-Liner process that originated in the USA and was introduced into Europe in … |
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Feb 16, 2011 Deforming processes with PVC liners, contrary to the processes mentioned above, require the application of heat before insertion in order to improve flexibility of the continuous pipe as well as also in the inserted condition in order to achieve an even temperature over the entire circumference for the reversion. Pre-deformed liners of PVC-U specially modified for this process can be used in the nominal size range DN 100 to DN 450. The degree of material … |
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Nov 23, 2004 In this group of processes, the respective plastic continuous pipes of PE or PVC specially modified for this process are predeformed into a U- or C-shape by supplying heat at the site or immediately before being pulled in so that, depending on the string diameter compared to the original cross section, a cross-sectional reduction of up to 40% [FI-Rehau] is achieved. With continuous pipes up to DN 400, the increased flexibility resulting from the cross … |
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In the rolldown process, the temporary diameter reduction of the prefabricated continuous pipe is achieved mechanically with the aid of a hydraulically driven gripper mechanism and two - or for larger nominal sizes three - hemispherical roller pairs set at 90° to each other (Bild 5.3.2.2.1.4.2.1) (Bild 5.3.2.2.1.4.2.1) (Bild 5.3.2.2.1.4.2.1) (Bild 5.3.2.2.1.4.2.1).
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The Swagelining process is a British development and is protected by a patent. The term "swage" means: "to work in a die". In contrast to the Rolldown process, the temporary reduction in diameter is carried out thermally and mechanically in a die. This consists substantially of a firing chamber, a heating section and the die plate. Air is heated to 100° C in the gas-burning firing chamber (Bild 5.3.2.2.1.4.2.2) and is blown into the heating section … |
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Nov 23, 2004 The reduction processes were originally conceived for the rehabilitation of water supply and gas piping. Nowadays they are also utilised for rehabilitation work in the sewage sector for pressure pipes as well as for gravity sewers [John91]. In contrast to the deformation process, the outside diameter of the HD-PE plastics continuous pipe is thermally and/or mechanically reduced by about 10% immediately before the insertion process while the circular … |
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Feb 16, 2011 As regards the finishing work and testing, reference is made to the discussions of the conventional slip lining process (Bild 5.3.2.2.1.1). The restoration of branch connections or side inlets can be carried out with the above-mentioned process by the open cut and the trenchless methods. Furthermore, special processes have been developed which will be presented below. One solution using the open cut method for steel or cast iron pipes that have been … |
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Nov 23, 2004 The advantages mentioned under points 3 to 10 for the conventional sliplining process are also principally appropriate for the sliplining process without annular space. Further advantages are:
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A characteristic of the sliplining process without annular space is the insertion into the section of the sewer to be rehabilitated of a plastic continuous pipe (liner) reduced in its cross sectional dimensions by means of pre-deformation and the subsequent re-formation until it lies up against the inner wall of the sewer or until it has reached its original circular cross section. In this way the annular space is eliminated and the work involved … |
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Nov 23, 2004 In this process a correspondingly long, flexible and welded-together continuous pipe is pulled into the sewer sector (or at least one section of the sewer) to be rehabilitated in one pass via an excavation or manhole. The pipe material is of HD-PE or PP (in individual cases also PVC-U but then not welded) and is of an outside diameter smaller than the smallest clear diameter or dimension occurring in the section of the sewer. One differentiates between (… |
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Nov 23, 2004 As regards the regions of utilisation and conditions for the application of the long pipe and short pipe processes reference is made to the discussion of the slip lining process with annular space in Abschnitt 5.3.2.2.1. A deviation from this is that the limit on nominal size does not apply and, in the man-accessible region, the technical limitation of sewer length that can be rehabilitated from a starting manhole. The process is not bound by any special … |
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Feb 16, 2011 (Image: HD-PE liner with ovoid cross section [FI-Kenne]) In the long pipe and short pipe processes all materials (Tabelle 5.3.2.2) and pipe joints can be used that satisfy the requirements of the application cases being considered here (Abschnitt 5.1) [Gale81b] [Stein83c] [Damma85] [Schro84] [Cunni84] [NN86e]. The most common pipes used are those with circular cross sections. If required, it is also possible to use mass-produced pipes of other cross … |
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Nov 23, 2004 The preparatory work is identical to that in the slip lining process with or without annular space (Abschnitt 5.3.2.2.1). If the manhole dimensions - even when the manhole throat (taper) and the manhole top are removed - do not permit the insertion of the selected length of the pipe and the insertion process for the liner from an existing manhole, then the digging of a starting excavation is necessary (long pipe process). According to [FI-ENVIC], short … |
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In principal, this process is comparable with the sliplining process (Abschnitt 5.3.2.2.1). A pulling head is fixed to the first pipe in the starting manhole, the winch cable is fixed and the pipe is pulled into the section of the sewer to be rehabilitated so far that the pipe joint region is still in the manhole. The next pipe is joined to it in a tensile-force-tight manner, e.g. by means of heating element butt welding (reflector welding) for HD-… |
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In this method, the winch cable is pulled from the target manhole through the piping and the pulling force is applied to a pressure plate fixed to the end of the last pipe still in the manhole or the traverse in the already jointed piping. The piping is thus only subjected to axial pressure so that no tensile-force-tight pipe joints are … |
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