Leica Geosystems TruStory Track Monitoring Traunstein, Germany

Company ing Traunreut GmbH, Germany www.ing-ingenieure.de

Challenge Track monitoring of the Munich- Salzburg railway line during the con- struction of the Ettendorf Tunnel (crossing under the tracks)

Customer Federal Republic of Germany (State Building Authority, Traunstein)

Project period Munich-Salzburg railway line above the tunnel site June 2009 to June 2010

To reduce traffic through town The installed measuring system Location the local authority for the not only uses Leica TCA1800 Total German town of Traunstein Stations but is also testing the decided to build a bypass road new Leica TM30, a total station starting in spring 2009 and specially developed for monitoring. including a new tunnel under These motorized sensors ensure the Munich – Salzburg railway that measurements to 100 prisms line. The track owner, Deutsche attached directly to the structure Bahn AG (DB), stipulated con- are taken and recorded continu- Project summary tinuous monitoring of the ously, around the clock. Also in- Hardware stretch of rail affected by the stalled are meteorological sensors, Leica TCA1800 tunneling operations. Lead a webcam, and 38 tilt sensors. Leica TM30 consultant Bernd Gebauer GmbH The total stations were set up on Leica GPR112 monitoring prisms decided to install a track posi- two pillars, each about three Leica GMP104 mini prisms tion monitoring system and meters tall, in a settlement-free Tilt sensors engaged consulting engineers area and protected from the Meteorological sensors ing Traunreut GmbH for the weather, vandalism, and theft by Webcam (panTerra.tv) task. The system of freely com- a specially manufactured housing. Software binable measurement sensors Leica GeoMoS Monitor from Leica Geosystems in con- The highly accurate total stations Leica GeoMoS Analyzer junction with the Leica GeoMoS automatically measure the 100 Leica GeoMoS Web or GeoMoS Web monitoring prisms in specified measurement Web service panTerra.tv software proved to be perfectly cycles from two positions per SMS delivery function aspsms.com suited to this task. cycle. Two complete sets of meas- Page 2 (DSL), in order to safeguard data transfer in the event of a failure. Communication Another requirement was that the Fixed line data communicati- measuring system must have an ons (DSL) backed up by a independent power supply capable UMTS fallback system of bridging short-term outages. If the specified tolerances are Objective exceeded, the system alerts the Early detection of movements DB track manager by text message. of the track during the works In addition, there is also an in order to minimize risks optional notification by landline. and hazards to rail traffic

Services Comprehensive Service Concept - Continuous measurement Client requirements and wishes of changes in the position, could be complied with in real level, and tilt of the Munich- time thanks to the swift and Salzburg railway Leica GPR112, Leica GMP104 prisms and tilt sensor excellent support from Leica Geo- track systems. The Leica Geosystems - Continuous monitoring of support team was not only able the position of the masts urements are taken per hour. In to advise the consulting engineers and overhead line equipment addition to these measurements, on design and installation of the - Visualization and evaluation tilt sensors mounted on the systems, but was also actively of the measurement data sleepers also monitored track involved on site and provided using Leica GeoMoS Web movement. All the captured data excellent support throughout the - Alerts by SMS and fixed line were transferred almost in real- project by remote access. In addi- networks when tolerances time to a GeoMoS computer and tion, the Leica Geosystems pro- are exceeded visualized for the customer with grammers were always on hand the help of GeoMoS Web. to perform any requested adjust- ments to the graphics on GeoMoS Web. General Requirements of the Monitoring System The strict conditions imposed by Data Retrieval with Leica DB required the monitoring system GeoMoS Web to meet very high demands. The The engineers are able to display installed tilt sensors had to ensure and analyze the captured moni- a measuring accuracy of +/-0.3 toring data over the Internet using mm/m, while an accuracy of GeoMoS Web. The GeoMoS Moni- +/- 1.0 mm was required for total tor module uploads measured station measurements. Reliability data to the GeoMoS web server of the system is very important, via FTP. There the data can be particularly with regard to storage configured individually and dis- and security of the measured played graphically. Users with data. One of the precautions appropriate access codes can then taken by ing Traunreut GmbH was access the information. The use of therefore to install a fallback sys- the Leica Geosystems host service tem for data transfer over UMTS, (“Software as a Service”) elimi- Measurement pillar with Leica TM30 and in addition to the fixed data lines nates or minimizes costs for hard- webcam Page 3

ware, software, and IT. New fea- tures are always made immediate- ly available to all users and do not require any further installation on the customer's computer, while the encrypted web service looks after the secure transfer of data over the Internet. The customer Graphics Leica GeoMoS Web (track distortion) gains access to the graphics on GeoMoS Web from a login screen. carry out track rectification after a between trains or required only a Once logged in, he can analyze depression with a vertical dis- temporary closure of the track in the data, e.g. by changing the placement of up to 25 mm one direction. time frame or extracting the results appeared in a length of track. Test Phase with Leica TM30 from one of more points or sen- Since the start of track monitor- Since the start of the project the sors. By installing a high-resolution ing, the track has settled up to 5 ing Traunreut engineers used two webcam ing Traunreut offers cus- cm. However, not just tracks are Leica TCA1800 total stations for tomers the additional benefit of a affected: movements were also monitoring. These traditional quick overview of the actual site observed in the overhead line monitoring instruments impressed conditions through GeoMoS Web. masts. A tilt of almost 7 mm/m the engineers with their robust- By installing a high-resolution web- developed in a mast foundation, ness and reliability. To prepare for cam from panterra.tv (German mo- which translated into a displace- future monitoring projects with dule partner of Leica Geosystems), ment of the overhead line of 3 to similar or higher requirements, ing Traunreut GmbH was also able 4 cm and meant that the position ing Traunreut GmbH decided to to offer its customer the addition- of the overhead line on the south- test the new Leica TM30 moni- al option of obtaining a quick ern mast had to be corrected. All toring sensor in this role. After overview of the actual conditions settlements were detected at an completion of the first monitoring on site through GeoMoS Web. early stage by the monitoring sys- phase, one of the TCA1800s was tem. This allowed appropriate replaced by a Leica TM30. The Changes in Track Position early corrective measures to be new model remained in operation With GeoMoS Web, the client can implemented before reaching a throughout the entire second get information about current stage where notification of the monitoring phase, during which changes in track position at any track maintenance manager would time it made a big impression, time during the works. Some of have been necessary - which measuring almost silently with its the larger movements were would have triggered an expensive new piezo drive capable of higher observed in particular during tun- temporary closure of that com- rotation speeds, whilst achieving nel shield driving in Phase 2. On plete section. Instead corrective improved accuracy over a longer two occasions it was necessary to work could be carried out range. It also offers two very use- Page 4 ful functions in TargetView and TargetCapture. Using TargetView, the instrument can select the correct prism from several others in the immediate vicinity. The TargetCapture function stores a digital image of the field of view for target-point documentation purposes. This not only allows the causes of obstructed visibility, such as mist, to be identified, it can also be combined with a web- cam. Compared with the TCA1800, in the same time the Leica TM30 measured twice as many points with a higher accuracy. Even though the TCA1800 total station fulfils the requirements of this project for the time being, in the future the Leica TM30 could take Installation of pipe canopy tunnel lining (monitoring phase II) over this role on monitoring proj- ects. Conclusion would not have been possible This project shows yet again how without such a system. Damage to important and worthwhile a moni- existing infrastructure, and possi- toring system is for site supervi- bly to passengers and site staff, sion. The measurement and analy- could have had grave conse- sis of track deformation, including quences. fast reactions to the changes,

The graph shows the longitudinal profile with the measurement series V prisms. The measurements from P506 to P511 clearly show the formation of the sag in the track.

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