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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 (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 (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 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 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 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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Aug 05, 2008 The principle is based on the jacking of a pipe open at its front (open shield without excavation tools) in which, in order to reduce the friction forces, the soil that has entered is transported mechanically at regular intervals of time by means of a scraper or skip arrangement to the starting shaft and from there is lifted to the surface with a special slit grab. (Image: Principle of the LUNDBY method with spoil removal by a scraper arrangement … |
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Aug 05, 2008 Microtunnelling methods with soil displacement differ in the design and mode of operation of the displacement and steering head. Examples of three different microtunnelling methods with soil displacement are:
(Image: PERIMOLE TPM 200 method for jacking pipes DN/ID 200 [FI-Isekib] - View) (Image: ACEMOLE PL 30 [FI-NTTb]) (Image: HERRENKNECHT AVB microtunnelling method with soil displacement [FI-Herreb]) |
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Aug 05, 2008 In the PERIMOLE TPM method [FI-Isekib], the cone-shaped displacement and steering head is divided into two. The cone point and cone rump rotate eccentrically in opposite directions about their common axis during jacking and in this way displace the soil [Wilhe99a]. (Image: PERIMOLE TPM 200 method for jacking pipes DN/ID 200 [FI-Isekib] - View) (Image: Displacement and steering head of the PERIMOLE method) |
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