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Feb 10, 2020
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Feb 10, 2020
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Feb 10, 2020
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Feb 10, 2020 The subsoil investigation should aim to determine the relevant subsoil properties for the application being considered and the required subsoil characteristics. Therefore, especially for the choice of a suitable construction method, excavation tools, and conveying system, the behavior of the subsoil must be analyzed in order to determine:
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Feb 10, 2020
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Feb 18, 2020 (Image: Schematic profile of the connections between the formation of rock material and the structures of the earth's crust [Wagen79]) |
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May 19, 2011 This presentation is part of the series of presentations "Utility Tunnelling" and deals with the fundamentals in geology, hydrogeology and geotechnical engineering. |
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Condition of the sewer before cleaning
Sewer cleaning Sewer cleaning is usually carried out using high-pressure cleaning. As the 21 m (69 ft) long sewer section to be rehabilitated was not cleaned at the beginning … |
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Nov 24, 2004 Rehabilitation and Maintenance of Drains and Sewers Technical Requirements Regarding New Piping, Rehabilitation and Maintenance According to ATV-A 142E [ATVA142a] an optical inspection in a 5-year cycle is recommended for sewers in the protective zone III and for private sewers (drain systems), the 5-year cycle is mandatory. Corresponding to the condition and the loading of the installation, shorter intervals may be necessary. The flow is to be stopped immediately if damage to pipes or pipe joints is ascertained during inspection (deviation, retention, back-up). If necessary, … |
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Aug 03, 2005 The results of the geotechnical investigation as well as the laboratory analyses must be determined accurately by the geotechnical specialist or engineering geologist and described in a geotechnical report. According to DIN 4020 [DIN4020:2003] [DIN4020:2003], the geotechnical report comprises the presentation and evaluation of the results of all geotechnical investigations and the conclusions to be drawn with regard to the project and the construction … |
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Jun 01, 2004 (Image: Diagram of soil and rock classification in accordance with DIN 18319 [DIN18319]) The soil and rock classes, for trenchless technology for installation of prefabricated pipes of any profile by means of pressing-in, pushing-in, ramming-in or pulling-in, is defined in the Federal Republic of Germany by DIN 18319 " Contract procedures for building works - Part C: General technical specifications for building works; Pipe drilling works " [DIN18319:… |
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Aug 03, 2005 When using the trenchless method of construction a sufficient and carefully carried out geotechnical investigation is decisive for the technical and economic success of a trenchlessly carried out sewer construction measure since the geotechnical and hydrogeological subsoil conditions decisively determine the selection of the jacking technique (machine type, conveying system, cutting head variant). In the sense of DIN 4020 [DIN4020:2003] [DIN4020:2003], … |
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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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Leaks are present when water obviously enters or leaves or when a test for leaks (Abschnitt 4.5.1) is not successful. According to [ATVM143-1:1989], leaks can occur with or without recognisable other damage in
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Feb 16, 2011 (for types of pipe joints (Abschnitt 1.7.1) ; requirements see DIN 19543) [DIN19543:1982]
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Nov 03, 2004
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There are numerous causes for the occurrence of leaks and they can be arranged in the following groups [ATVM143-1:1989] :
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The primary consequences of damage caused by leaks in sewers as well as to structures of drain and sewer systems are:
In both cases they always form the starting point for possible consequential damage [Horne85] [Young84]. |
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Nov 03, 2004 |
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Flow obstacles are objects or materials lying in the cross section of the pipe, which project into it or cross through it in such a manner that the cross section required for a proper flow of the sewage is no longer completely available. Properly integrated components such as reducers, throttling or back-up flaps do not constitute discharge obstructions in the sense of a damage. Typical flow obstacles often found in practice are [ATVM143-1:1989] :
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