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May 15, 2020
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May 15, 2020
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May 15, 2020 For jacking pipes of concrete, reinforced concrete and fibre concrete, use is made mostly of single-sided fixed guide rings, also called integrated guide rings. The anchoring in or on the jacking pipe is achieved by steel anchors concreted into the pipe wall and circumferentially welded to the guide ring. In order to prevent circular seepage through valley flanks, a seal must be provided at the connection faces of the steel guide ring. (Image: Joint … |
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May 15, 2020 When arranging a loose guide ring, all pipe ends are identical. In order to avoid the entrance of soil particles into the gap between the guide ring and the jacking pipe, use is made of so-called joint closure based on subsequently installed elastomeric rings or swelling rubber seals. (Image: Joint of jacking pipes with loose steel guide ring for concrete, reinforced concrete or fibre cement) |
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May 15, 2020 The activatable seal represents a special development to improve the reliability of the seal. The activatable seal is factory mounted on the spigot end and after the completion of all construction work is activated by means of a complete filling with polyurethane material (PU) under pressure into a permanent and pressurized waterproof seal [FI-Westr]. (Image: New development for the sealing of pipe joints - Gasket can be activated with reference to [… |
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May 15, 2020 For testable pipe joints the actual test cavity is limited by respectively an outer and an inner seal that is installed before the start of the jacking works. The feeding-in of the test medium (water or air) is achieved through a test pipe concreted into the reinforced concrete pipe at the factory. The pressing out of the inner sealing ring when pressurizing is meant to be prevented by the sheet steel ring anchored to the inside of the spigot. (Image: … |
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(Table: Material properties for fibre cement) |
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(Table: European Standards for pipes made of fibre cement (as at 10.2008)) |
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(Table: Material properties for vitrified clay) |
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(Table: European standards for vitrified clay pipes (as at 10.2008)) |
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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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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 installed by pulling-in, pushing-in, pressing-in and ramming-in. (Image: Steel … |
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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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