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Aug 04, 2008
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Aug 15, 2006 (Image: Microtunnelling with hydraulic spoil removal in single phase jacking) (Image: Basic equipment, possible arrangement components on the construction site and space requirements (ca. L × B = 35 × 4 m) for microtunnelling with hydraulic spoil removal - plan view (on the model of the jacking of pipes DN/ID 600, pipe length 2.0 m)) Method of operation and sequence Microtunnelling with hydraulic spoil removal is characterized by the jacking of pipes … |
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Aug 04, 2008 (Image: Basic equipment, possible arrangement components on the construction site and space requirements (ca. L × B = 35 × 4 m) for microtunnelling with hydraulic spoil removal - plan view (on the model of the jacking of pipes DN/ID 600, pipe length 2.0 m)) The dimensions of the starting shaft are determined by the type of machine and the selected size and length of the jacking pipes. Today, use is made mostly of prefabricated reinforced concrete … |
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Aug 15, 2006 (Video: Integrated high-pressure flushing system in the crusher space of the AVN microtunnelling machine) Video: Integrated high-pressure flushing system in the crusher space of the AVN microtunnelling machine with reference to [FI-Herrea] [Image: S&P GmbH]. This interactive object is only visible online. |
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Aug 04, 2008 It is not possible in all cases (e.g. in the later creation of drainage pipes in waste dumps and contaminated areas or the creation of pipe arches [Camp01]) to excavate target shafts, for instance, for the removal of microtunnelling machines. In such cases, only microtunnelling machines that are suitable for the jacking of blind borings can be used, and which, after reaching the target point, can be pulled back again through the jacked pipe string … |
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Aug 04, 2008 In microtunnelling with hydraulic spoil removal, the flushing medium is circulated with the aid of pumps through an enclosed piping system inside the jacking pipe string that is successively increased in length with the installation of a new jacking pipe. When using water as a flushing medium usually settling basins suffice for separation. (Image: Fluid circulation of microtunnelling by means of hydraulic spoil removal) (Image: Settling basin to separate … |
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Aug 04, 2008
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Aug 04, 2008 (Video: Schematic illustration of a two-stage hydrocyclone separation plant with subsequent centrifuge) (not found) Video: Schematic illustration of a two-stage hydrocyclone separation plant with subsequent centrifuge with reference to [Rubar99] [Image: S&P GmbH]. This interactive object is only visible online. |
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Aug 04, 2008 Most of the microtunnelling machines using the principle of soil removal are equipped with a crusher in order to expand the limits of applicability to soils of the additional classes S according to DIN 18319 (not found) and to rock with a high degree of discontinuities. These are so designed that cobbles, boulders and pieces of rock up to a maximum size of around dmax = 1/3 of the external diameter of the cutting head can be crushed to a particle … |
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Aug 04, 2008 (Image: Stone crusher arrangement of the UNCLEMOLE [FI-Isekib]) (Image: Eccentric cone crusher [FI-MGF]) (Image: Pipe-Replacer [FI-NLW] - Eccentric breaker disc; the coned breaker disc is placed eccentrically on the main drive shaft) |
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Aug 04, 2008 In all cases it is reasonable to additionally install a high-pressure flushing system in order to avoid clogging of the cutting tools during boring in sections of cohesive soil, but also in fault zones filled with cohesive soil inside rock, which can lead to an immense reduction of the effectiveness of the cutting tools and thus also of the jacking performance. (Image: Integrated high pressure flushing system in the crushing chamber (method AVN) [… |
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Aug 15, 2006 (Image: Microtunnelling with pneumatic spoil removal) (Image: Equipment, possible arrangement of the components on the construction site and space requirements (approximately L x W = 34 x 4 m) in microtunnelling with pneumatic spoil removal - plan view (on the model of the jacking of pipes DN/ID 600, pipe length 2.0 m)) Method of operation and sequence Microtunnelling with pneumatic spoil removal on the basis of a suction plant is characterized by the … |
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Aug 04, 2008 (Image: Equipment, possible arrangement of the components on the construction site and space requirements (approximately L x W = 34 x 4 m) in microtunnelling with pneumatic spoil removal - plan view (on the model of the jacking of pipes DN/ID 600, pipe length 2.0 m)) The required internal diameter of the starting shaft is:
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Aug 04, 2008
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Aug 04, 2008 In the method with pneumatic conveying based on a suction plant, the spoil from the excavation and crusher chamber moves through an opening into a rotary vane lock arranged in front of the suction nozzle. From there, with the aid of the air flushing medium, it travels through a suction line up to the surface and to the preliminary separator where it is separated from the airflow. The rotary vane lock separates the excavation and crusher chamber from … |
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Aug 04, 2008 The spoil in the excavation chamber is pressed into the discharge pipe (DN/ID 50 (2 in)) and is transported from there with the aid of a further jet of air to a vacuum container on the surface (pressure plant). The separation between the pressurized excavation chamber and the discharge pipe is achieved by means of a so-called "control plate" - a plate with ten peripheral openings of 50 mm clear dimension acting on the principle of the rotary vane … |
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Aug 04, 2008
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Aug 04, 2008 Microtunnelling machines with pneumatic spoil removal are used with standard cutting heads as well as rock cutting heads so that the same areas of application are valid in soils and rock as with hydraulic spoil removal to [Becke96] [Wilhe99a]. (Image: Microtunnelling machine with pneumatic spoil removal (method AVP [FI-Herreb]) - Scraper cutting head with view of the rotary vane lock behind the excavation chamber) |
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Aug 05, 2008 Method of operation and procedure Microtunnelling with scraper spoil removal is marked by pipe jacking with the simultaneous excavation of soil at the work face by means of a cutting head and continuous or discontinuous soil removal with a scraper arrangement. One representative of this group is the Swedish LUNDBY method [FI-Skansb]. (Image: Microtunnelling with spoil removal by other mechanical means (spoil removal by a scraper arrangement)) |
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