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Aug 04, 2005 Laterals have to be produced and connected in such way that they are capable of taking up movements. Possible settlements and the loads in the connection area resulting from them are to be taken into account [ATVA139a]. The connection must only be carried out with fittings and sealing media which are standardised or for which
by the DIBt - Deutsches … |
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Jun 02, 2004 One possibility in the case of drain and server systems of reducing the number of connections to a sewer and thus the additional excavation or connecting borings is the use of the starting or target shafts that are already available for the star-shaped jacking of laterals at any desired depth and direction (Bild 6.4.3) (Bild 9) and their connection into the manhole [Stein80b] [Stein82c] [Stein85d]. This method is used in the so-called "Berliner Bauweise" |
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Aug 04, 2005 With the construction of the main sewer also drains should be produced. According to EN 752-1 [DINEN752d], a drain is defined as a "pipeline, usually underground, designed to carry wastewater and/or surface water from a source to a sewer." In literature and the regulations also the synonyms connection sewer, service pipe, building connection or lateral can be found. In the following, the term lateral is used. Laterals can be produced with the open-… |
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Aug 04, 2005
For creating starting-, target- and intermediate shafts as well as for works when jacking, the relevant … |
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Aug 04, 2005 Direct visual contact between the machine operator and the personnel in the jacking area of the starting shaft is important. If direct visual contact is limited or impossible, a safe possibility of communication has to be provided by organisational or technical measures. This is achieved by employing a marshaller, by a telephone-/radio connection or by video supervision, for example. It has to be ensured that the pressure ring (Bild 3) can be processed … |
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Aug 04, 2005 Loads are to be attached in such way that they are protected against falling off. Due to the often limited space conditions inside shafts it has to be basically expected that loads can jam or cant. That is why load handling attachment and attachment devices have to be chosen by the contractor under consideration of the increased danger potential in shaft feeding so that the load can be taken up, kept and loaded off safely when meeting the regulations. … |
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Aug 04, 2005 The measures for work safety and health protection are strictly organised differently in the international context. For this reason the following regulations present very strict regulations for the protection of personnel, but which have proved themselves in practice and are to offer a maximum of safety. They present important excerpts from for the work on jacking construction sites in a brief way and they are exceptionally based on the regulations … |
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Aug 04, 2005
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Aug 04, 2005 Jacking plants are characterised by a high degree of mechanisation, which requires the application of correspondingly specialised and qualified building contractors. A professional and safe realisation of the construction when installing sewers by the trenchless method of construction is achieved by contract letting to building contractors who provide proof of expert knowledge and suitability. Due to their own mechanical and procedural requirements … |
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Aug 04, 2005
The visual inspection includes:
Acceptance tests of non-accessible sewers are carried out by means of TV technology according to … |
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Jun 02, 2004 (Image: Principle of compressed air- and vacuum testing of a sewer and a connection sewer (without the depiction of the push-out protection) with reference to ATV-A 139) The test times and -pressures for pipelines without manholes and inspection chambers depend on nominal sizes and testing methods (LA, LB, LC, LD) and can be extracted from Tabelle 13.2.1. They deviate from the corresponding information given in EN 1610 [DINEN1610:1997] [DINEN1610-… |
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Jun 02, 2004
Test pressure is the pressure, which results from the filling of the test section to the ground level of the shaft situated either upstream or downstream, of … |
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Aug 04, 2005 According to EN 12889 [DINEN12889:2000] the testing (specification test) of leaktightness of the pipeline including all connections, manholes and inspection chambers is either to be carried out with air (Bild 13.2.1) or with water (Bild 13.2.2) for each section or part (approximately 100 m). The selection between the testing with air (compressed air- or vacuum testing) or water is made by the client. If during the testing the groundwater level is … |
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Aug 04, 2005 After the completion of the jacking works condition establishment (visual inspections) and leaktightness tests are to be carried out; the results are to be recorded and archived. The testing programme prescribed in EN 12889 [DINEN12889:2000] corresponds to the final inspection or specification test of pipelines and shafts which have been installed by the open-cut method of construction according to EN 1610 [DINEN1610:1997] [DINEN1610-1:1997], ATV-… |
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Aug 04, 2005 The costs of trenchless installation can be divided into direct and indirect costs. Direct costs are understood to be the immediate costs of installing a sewer. They are identical to the cost of construction and are influenced by the local conditions of the particular method of construction. A part of the costs can thus no longer be influenced. They are made up of:
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Aug 04, 2005 The costs for the installation of pipelines using the trenchless method of construction depend on the factors and limiting conditions mentioned in Abschnitt 14.1, extended by the specific properties of this method of construction. Included in this are the sizes that can be influenced less such as material and equipment costs. The construction costs for the trenchless method of construction are principally influenced by four cost allocations:
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Jun 02, 2004
From the fact that jacking with point, compared with linear construction sites in the open cut method, is sufficient, there … |
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Aug 04, 2005 Generally one hears the point of view that the trenchless method of construction is always more expensive than the open cut method. This could also be a reason that, despite the advances and environmental advantages of trenchless installation, the tendering authorities, as well as construction companies use this method rather sparingly and in some regions there is no competition between the two methods. A particularly positive example for the utilization … |
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Aug 04, 2005 Subsequently the individual working steps are summed up in the form of an instruction (Tabelle 15.2) in note form. The working steps should enable the decision process in an easy way in connection with the a planning of a sewer construction measure (assumption: the basic evaluation is already completed) if a sewer can be installed in the economic way by trenchless installation and by taking into account the pipeline-specific limiting conditions with … |
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Aug 04, 2005 Line and level of the sewer to be newly installed given by the general dewatering plan and sewage removal concept or the results of the sewer net planning, especially the hydraulic calculation (nominal pipe size, gradient) should be entered into the site and height plan within the scope of the planning so that a first impression of the topographic and local conditions, section length (manhole distances), surfacing and especially the positional depth … |
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Aug 04, 2005 |
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Jun 02, 2004 The terms and definitions listed in the following represent an abridged excerpt from the comprehensive glossary of the technical book: Stein, D.: "Trenchless Technology for Trenchless Installation of Cables and Pipelines" [Stein05a]. Abrasiveness: Air-(gas)-flushing: |
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Mar 22, 2011 This manual is the first to provide a comprehensive, easy-to-understand overview of the possibilities of trenchless pipeline construction for installing non-accessible pipelines and sewers by means of pilot pipe jacking and microtunneling. In 15 chapters with 85 pictures and 26 tables, all important aspects to be considered during planning, construction and acceptance are presented in a practical and easy-to-understand manner, in addition to detailed descriptions of the procedures and methods. Furthermore, topics jacking pipes, geotechnical investigations, starting- and target shafts, obstacle problems, steering and monitoring, lateral connection, work safety and health protection, planning, and economic considerations are also covered. |
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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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Feb 16, 2011 Rehabilitation and Maintenance of Drains and Sewers Structure and Limiting Conditions of Sewer Systems - Historical Outline (Image: Age distribution of the sewers in German Federal Republic (position 1990) [Kedin87]) With the industrial development at the start of the 19th Century there arose, especially in the large cities of Europe (e.g. in Great Britain in 1840 and in Germany in 1842) the necessity for the building of sewers, i.e. of installations for the collection and drainage of sewage [DIN4045:1985]. Since then they have been constantly extended and today present … |
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