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Jun 09, 2006 (Image: Production of concrete pipes) Concrete is a material of natural or artificial aggregates that are coated by a binder-water mixture (fresh concrete) and, in the hardened condition of the binder, are permanently cemented into it (fixed concrete). The following discussions refer to cement concretes according to DIN 1045 whose binder is made exclusively of cement with some pozzolanic or latently hydraulic additives. [DIN1045:2001] |
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Jun 09, 2006
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Oct 02, 2008
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Oct 02, 2008 (Image: Reinforced concrete jacking pipe) (Image: Reinforced concrete jacking pipe - Double seal in spigot end) (Image: Reinforced concrete jacking pipe - Safety bolt against rolling of the pipe string) (Image: Reinforced concrete jacking pipe - Steel guide ring, pressure transmission ring made of wood and opening for securing bolts against rolling of the pipe string) (Image: Reinforced concrete jacking pipe - Equipped with lubrication station) (Image: … |
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Oct 02, 2008 (Table: European standards for concrete and reinforced concrete pipes (as at 10.2008)) |
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Oct 06, 2008
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Oct 06, 2008 For concrete / reinforced concrete jacking pipes the following corrosion protection measures come into question:
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Oct 06, 2008
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Oct 06, 2008 Possible material combinations are:
(Image: Reinforced concrete jacking pipe with inner lining of plastics) (Image: BKU reinforced concrete jacking pipes - View) (Image: Concrete pipe with invert lining of cast-basalt elements) (Image: Concrete pipe with vitrified clay plates) |
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Oct 06, 2008
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Oct 06, 2008
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Oct 06, 2008
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Oct 06, 2008 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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Oct 06, 2008 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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Oct 06, 2008 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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Oct 06, 2008 For testable pipe joints the actual test cavity is limited by respectively an outer and an inner seal that are 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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