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(Image: Steerable techniques) Both systems (SAS 22 and GTS) consist of [NN98i] [Blum95]:
All modules are connected via data lines with the PC in the steering … |
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(Image: Documentation) Additional data for jacking monitoring are, for example:
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(Image: CoJack - sequence diagramm of simulation) |
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(Image: Attention!) In the monitoring of the running jacking works, CoJack requires precise and up-to-date measuring values from the construction site. (Image: Procedure of the online-simulation of pipe jacking - NEU) (Table: Areas of application for a monitoring / supervision of a pipe jacking project) For this purpose a Gap Measurement System (GMS) has been developed especially according to CoJack's requirements, whose sensors continuously and automatically … |
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The measurement system works completely independent from the installed steering guidance system and can thus be installed at any construction site directly after the start of the jacking works. Usually the sensors consist of:
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All measurement data are transmitted to the system computer via data cable and Controller Unit and are displayed there. The system creates a data base, in which the single sensor values and/or the openings of the recorded gaps and the present jacking forces generated by the jacking station and interjacks are consistently documented including the corresponding extensions. Via an on-line connection CoJack is supplied with these up-to-date measuring … |
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The functional principle and application of CoJack is shown in the diagram (right). The interaction with the construction site is made possible by signal light concept. The 'signal light' represents a practical, simplified illustration of the results. Basically, jacking measures simulated via CoJack can be categorised in 4 case groups according to Table below. (Image: Functional principle and application of CoJack) (Table: Case groups of the simulation … |
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Sep 09, 2008 This presentation is part of the series of presentations "Utility Tunnelling" and deals with the fundamentals in steering, measurement and monitoring of pipe jacking projects. |
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Today, supply and discharge lines are still predominantly installed by using the open-cut method: a trench is dug, the lines are installed. Under the protection of an embankment or sheeting and the trench is filled afterwards. In the face of the numerous disadvantages as well as the citizens' growing environmental consciousness in the future it is urgently necessary to take trenchless technology into account much stronger than until today as an alternative … |
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Aug 25, 2008
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Aug 25, 2008
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Aug 25, 2008 (Video: Open face shield (Tunnel Boring Machine) – dissmantling of the working face with axial cutter head (roadheader)) (Image: Attention!) Natural support of the working face is always applicable when the existing subsoil is free of groundwater and the working face is a priori stable (working face without support) or is sufficiently supported by a self-forming earth wedge with a natural slope angle. Thanks to the Epping Group for providing the video! |
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Aug 25, 2008 (Image: Attention!)With partial support, the surface of the working face is divided into sections and is either supported by means of natural partial support on bench plates (bench (plate) or platform shields) and/or by means of mechanical partial support using breast plates. (Image: Hand shield with breast plates - working face with mechanical partial support) (Image: Hand shield with benches (Bench shield) - working face with natural partial support) (… |
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Aug 25, 2008
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Aug 25, 2008
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