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(Image: Examples for jacking pipes made of various materials - Vitrified clay [FI-Steinb]) (Image: Vitrified clay jacking pipes) (Image: Jacking of a vitrified clay pipe in microtunneling ) (Image: Pressure test on a vitrified clay jacking pipe) |
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(Image: Steel jacking pipes) The steel pipes used in trenchless installation are usually welded constructions and seldom seamless pipes. They are distinguished by high strength, good ductility and good weldability and, in trenchless installation, are used mainly for the installation of pressure piping such as gas, water, pressurized sewers and inverted siphons [Buttc85] [Stein82b] [Rinck79]. They are installedby pulling-in, pushing-in, pressing-in … |
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(Table: European standards for the coating of steel pipes (as at 10.2008)) |
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(Image: Steel pipe with PE coating and additional FCM coating [FI-Mannea] - Applying the FCM coating) (Image: Steel pipe with PE coating and additional FCM coating [FI-Mannea] - Completed pipe) (Image: Steel pipe with PE coating to DIN 30670 [FI-Mannea]) (Image: FCM-S steel pipe with MAPEC polyethylene coating, clamping profile and FCM [FI-Mannea] - Pipe cross section) |
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(Table: European standards for the lining of steel pipes (as at 10.2008)) |
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For the internal corrosion protection of steel pipes, use is usually made of a cement mortar lining or coating (CM lining) to DIN 2614 or to EN 10298 and DIN 2880 which will wholly or partly replace DIN 2614. There are two variants:
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Jacking pipes of reinforced concrete with steel have only been on the market for a few years and up to now have only been used in the nominal size DN/ID 1200 for pressurized water pipes. (Image: Reinforced concrete with steel jacking pipe DN/ID 1200 [FI-Gollw] - View) |
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(Table: Material properties for ductile cast iron pipes to EN 545 (water piping) [DINEN545a], EN 598 (drains and sewers) [DINEN598], EN 969 (Gas piping) [DINEN969]) |
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(Table: European standards for ductile cast iron pipes (as at 10.2008)) |
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Jacking pipes of ductile cast iron are manufactured in the centrifugal casting process in rotating, water cooled chill moulds and are used in the following forms:
(Image: Ductile cast iron jacking pipes with cement mortar jackets [Mayr96]) |
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(Image: Hole corrosion - pitting) Unprotected and earth-covered piping of ductile cast iron can be damaged by corrosion from the outside and inside when they come into contact with oxygen-enriched watery media, so that such pipes must be provided with an outer and inner corrosion protection when used in water or sewage sectors. |
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(Table: European standard for the coating and lining of cast pipes (as at 10.2008)) |
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