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Nov 19, 2020 News hannah Lee Advanced data-led technology from leakage specialist Ovarro is successfully feeding into the largest smart water network pilot in the UK.
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Nov 20, 2020 News CADENAS GmbH Manufacturer for building drainage publishes 3D BIM CAD catalog of its components with intelligent design data powered by CADENAS.
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Nov 23, 2004 The Twin-Line Process is characterised in that the two resin components (polyurethane) are no longer pumped through separate lines to the spray lining machine but are filled into correspondingly large storage hoses in-situ. The lengths of the storage hoses correspond to the length of the sewer to be rehabilitated; the diameter is determined by the required quantity of polyurethane as a function of the layer thickness, pipe nominal size and mixing … |
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Nov 23, 2004 In this process group, the coating material used at present is mostly polyurethane resin and it is sprayed with the aid of special rotary spray heads onto the pipe inner wall to a thickness of 5 to 30 mm in a single working pass without wet smoothing. The work is carried out after surface preparation according to Abschnitt 5.3.1.4 from the entry manhole. Representatives of this group of processes are:
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In the spray lining process, the coating is hurled against the inner pipe wall by means of a quickly rotating centrifugal head. In the same process, when used in the water supply sector to DVGW-W 343 [DVGWAW343], the coating surface is usually smoothed by means of an accompanying device. In the sewers, smoothing is only possible if no pipe displacements are present and the pipe is of circular cross section. As these requirements are fulfilled only … |
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Coating is a generic term for one or more layers of interconnected coating materials on a base with which they are connected through adhesion. Coating processes, as used in sewers, serve the purpose of replacing or improving the resistance against physical, biological, chemical and/or bio-chemical attacks from inside, for hindering a renewed build-up of incrustation, for re-establishing and/or increasing the static bearing strength as well as the … |
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Nov 23, 2004 Basically, all materials suitable for sewage can be used for the later lining of sewers and pipes according to ATV-M 143E Part 3 [ATVM143-3]. The demands on the lining materials arise from the operating conditions. These are influenced to a great extent by the media in use as well as the planning, design and operation of the sewers [DIBt96] : Linings must be fairly impermeable against substances that can attack concrete. They must be resistant to all … |
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Nov 23, 2004 Non-self-supporting or linings that cannot support a static load, can, however, sometimes carry their own weight [ATVM143-4b]. They must be connected (anchored) with the carrier cross section and must not tear off [DIBt96]. According to ATV-M 143 Part 4 [ATVM143-4b], fastening elements are used for this purpose. "Fastening elements depend on the process. For large surface plastics form pieces, for instance, they can be made of the same material and … |
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Nov 23, 2004 Self-supporting linings, or those capable of supporting a static load, require no anchoring or fastening in the carrier cross section. For these, a static proof (Abschnitt 5.3.2.6) is required for loading from external sources (e.g. groundwater for pressure resistant linings) [IfBt82]. If it cannot be properly clarified what the extent of the loading will be as a result of external pressure, e.g. the amount of the loading, loading on the complete pipe … |
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Nov 23, 2004 The design of the lining must be carried out in accordance with the working instructions supplied by the manufacturer, the instructions for transport, storage and working so that, when the properties of the material are taken into account, no reduction of damage occurs [DIBt96]. Linings must also properly cover the regions of the pipe joints (e.g. sockets, and spigot ends). They must not make subsequent connections impossible [Trink87]. In the following, … |
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Nov 23, 2004 The tests of the connections are carried out in accordance with the paragraphs above. The tests for the absorption of longitudinal forces are carried out in accordance with EN ISO 527 [DINENISO527]. The test pieces without joints must have the same orientation to the installation direction of the ground material as the test pieces with joint. The test pieces with joints must be taken from the pipe in such a manner that the joint positions are lateral … |
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Nov 23, 2004 For the test piece without joint, the speed of the test to be selected from the standard is that one in which the tearing strength or the force at the elongation limit is reached in approx. 1 minute. The test speed reached thus is the one to be selected for the test speed with joint. To be found is the tearing strength (e.g. for PVC) or the tensile stress (e.g. for PR) as well as the tearing elongation or the elongation at tensile stress [DIBt96].… |
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Feb 16, 2011 The connections between sockets of manhole floor linings and the connected pipes must be leaktight. The testing of the connections must be carried out in accordance with the determinations for ground-laid pipe joints to DIN 4060 [DIN4060:1998]. In this, always the largest of a nominal size group per connected pipe type must be tested. For the evaluation of the resistance to root ingress, a test for external pressure and shear load as well as angular … |
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Nov 23, 2004 When the lining consists of individual elements, then their mutual connection (e.g. by gluing, welding) must conform to the same requirements as the lining itself. In the connections of these elements, there is differentiated between connections without mechanical loading and those with mechanical loading. Connections without mechanical loading are usually those that are meant to be installed in a longitudinal direction of the structures to be lined. |
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Besides the general requirements of the processes, materials and application for the structural rehabilitation of sewers cited in Abschnitt 5.1, the following special standards must be considered for lining processes:
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Feb 16, 2011 The sliplining process can be used with gravity flow and pressure pipes for almost all types of damage when the minimum free cross section is sufficiently large or when, by the removal of defined flow obstacles such as roots, incrustations, deposits or intruding connections it is correspondingly enlarged so than the hydraulically required liner can be accepted. Furthermore, the sewer must be at least temporarily stable and the bedding must be sufficient. |
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Feb 16, 2011
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Feb 16, 2011 With the conventional sliplining method, there are mostly used pipes made of HD-PE [Bröms95] to DIN 8074 [DIN8074a] and DIN 8075 [DIN8075:1997], DIN 19537 [DIN19537b], DIN 16961 [DIN16961b] but also of PP to DIN 8078 [DIN8078a]. The supply lengths of these pipes depend on the outside diameter and the possibilities for transport. Standard length is 12 m. Pipes up to 160 mm outside diameter of the pressure classes 6 and 10 to DIN 8074 [DIN8074a] can … |
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Nov 23, 2004 The following materials have proven to be useful for annular space grouting:
Furthermore, the so-called single grain sands [ATVM143-3] are also used in individual cases. These will not be discussed further. In similarity to ATV-M 143E Part 3 [ATVM143-… |
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Nov 23, 2004 Before the start of the grouting process, when not already carried out in the course of the liner insertion, the start and ends of the annular space or the grouting regions at the manholes and the side inlets, must be professionally closed off such that the grouting pressure can be absorbed and the control of the grouting process can be made possible. In order to prevent longitudinal changes, the liner must be secured against buoyancy [ATVM143-3]. |
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Feb 16, 2011
The grouting of the annular space can be carried out in two ways:
If an absolute complete grouting of the annular space is to be ensured, then in both variants, an injection hose can be laid, for instance in the crown of the section of the sewer, through which a later pumping can be carried out [DVGWAGW307]. In the first grouting method, … |
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Nov 23, 2004 The annular space formed by the insertion of the liner is grouted order to achieve, among others, the following [ATVM143-3] :
Further advantages of grouting the annular space are:
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Nov 23, 2004 The restoration of free areas behind the wall or the leaktight connection of existing laterals and branch connections that have not been included in the rehabilitation measures, also called side inlets, to the liner is one of the key regions in the rehabilitation of sewers that has a great influence on the success or failure of a lining process. The European draft Standard prEN No. 155 N 1784 E "Kunststoffrohrsysteme für die Renovierung unterirdischer … |
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Nov 23, 2004
The restoration of the branch connections using … |
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Feb 16, 2011 In the restoration of laterals using the trenchless method, the excavation is not needed as all the necessary work is carried out either from the rehabilitated sewer itself or via the lateral by hands and by means of remote controlled equipment respectively in dependency on the nominal size. In the latter case, the lateral must possess an access opening and possess a corresponding cross section for the insertion of the equipment. Fittings such as … |
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