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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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The replacement of defective sewers in the current line run by the open cut method is basically comparable with the corresponding new sewer construction. As already mentioned in Abschnitt 5.4, this is the state of the technology and is here assumed to be known, so that mention will only be made of some peculiarities of the case under consideration in the following. A fundamental condition for the application of this process is the knowledge of the … |
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The semi open cut method, also called the semi open pipe jacking, is characterized in that the new man-accessible sewer, as with hydraulic pipe jacking (Abschnitt 5.4.3.3), is pushed through from a starting excavation to the target excavation. The removal of the soil and taking the sewer taken out of service is carried out from the surface with the protection of a bottom ring, open in the crown and with the assistance of a grab or excavator. For this … |
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Feb 16, 2011
Gallery techniques or heading is used preferably in non-man-accessible sewers that have to be replaced and that have sufficient cover height. During gallery techniques or heading, the sewer or pipeline to be replaced is exposed, with the provision of a temporary protection, dismantled and replaced by a new one. The removal of the soil and the sewer or pipeline to be replaced is carried out manually with the aid of appropriate tools or machines e.… |
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Feb 16, 2011
Brunel's patent application 160 years ago gave the following definition for the shield: "A steel coat is pressed into the unstable ground with presses or spindles. Within the protection of this coat, the soil … |
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Nov 24, 2004 (Image: Microtunnel construction - View of the start shaft with main jacking station and reinforced concrete jacking pipe [FI-FBS]) Hydraulic pipe jacking (see ATV-A 125E or DVGW-W 304 [ATVA125:1996]) [Stein85a] [Conra84b] [Hornu89] [Scher77b] [Stein85e] has been available since the turn of the 20th Century as an alternative to the gallery techniques (heading) and the shield tunnelling with segment lining. This method for the case under consideration … |
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Feb 16, 2011 (Image: Cutting head modified for "pipe eating" [FI-Solta]) In this replacement process, also known as pipe replacing or pipe eating, the defective, non-man-accessible sewer or pipeline is run down by means of an unmanned pipe jacking technique < DN 1200 (Abschnitt 1.3), destroyed and removed, and at the same time the new sewer or pipeline with the same or larger nominal size is laid in the same pipe course [Stein88a] [Möhri88]. Depending on the process, … |
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Pipe replacement with the introduction of dynamic forces was developed by the British Gas Corporation, England [FI-Britia] for the gas sector (European Patent No. 0053480) (Bild 5.4.3.4.2.1) and this was later adapted for the sewage sector. Based on this development, similar processes and machine developments have been marketed internationally and also in the Federal Republic of Germany [FI-Ryan] [FI-DIGA] [FI-Tracta] [FI-Terrab] [FI-Broch] so that … |
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Hydraulic pipe bursting has been used in the Federal Republic of Germany in the past few years, for instance, under the designation KM- Berstlining [FI-KMG] (licensed under the patented … |
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In contrast to the static and hydraulic process, in the pneumatic pipe bursting process the kinetic energy of the percussion piston in the inside of the bursting body results in percussions that are transferred to the environment and can be connected with:
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(Image: Bearing effects of the soil in the secondary condition II initiated by a dynamic bursting process (schematic depiction) [Falk95b]) The determination of the required bursting force, especially the part attributable to soil displacement, as well as discussion on the form and radius of the plastic zone, are not only important for the testing of possible effects on the pipe run but make an important contribution to the definition of the loading … |
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Advantages of pipe bursting:
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Nov 24, 2004 (Image: Depiction of the principle of the pipe bursting process (dynamic bursting process in combination with short pipes) [FI-Tracta]) The basic idea behind pipe bursting, developed in the 80's of the 20th Century, is to pull a bursting body with a winch cable or a tension rod through the sewer that has been taken out of service and to thus destroy the pipe walling from the inside and to force it into the surrounding soil. A new sewer with the same … |
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Nov 24, 2004
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Jun 24, 2005 |
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With replacement in the same run of the pipe by the trenchless method, pipe eating and exchanging the old sewer occurs pipe, e.g. without excavating an open trench. With this method the most important processes are:
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The replacement of sewers, especially with the open cut method, is made much more difficult in inner urban areas by the existence of other supply pipes (Abschnitt 1.11) (Bild 1.11). They often present a substantial hurdle in carrying out construction work, which is reflected in the costs. … |
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