CIVILS, CONSTRUCTION & STATIONS
Three interlinked servers are used to run the Leica Geosystems software programs at the Crossrail construction site. The software is used to detect and analyse ground movement and the deformation of buildings above and below the site, and also helps to speed up and simplify the processing of real-time data collected by the total stations by up to 90%, which allows this data to be available from field to issue-in quickly. This software solution for the new Crossrail station is entirely from Leica Geosystems, and is the largest system of its kind existing anywhere in the world.
Engineering survey manager for the Costain- Skanska
Joint Venture, Steve Thurgood,
reports: “The software systems have to be very prescriptive and procedural to control the quality and repeatability of the project, yet also allow for dynamic change in the environment and construction phase changes. Our operation runs non-stop; we manage the software system to minimise and repair any faults that might occur. Both software systems log a phenomenal amount of data which correlates with an astonishing degree of accuracy and precision.”
The Leica GeoMoS software solution is a fully automated system for data generation.
It
offers automated processing and evaluation using statistical analysis,
comparing new
data to the original base model by using easy to understand graphs. It also continuously updates deformation analysis and network adjustment with vast volumes of real-time data received by the 44 to 49* total stations, resulting in highly accurate data, delivered fast.
When the data is processed, it is additionally optimised by network adjustment software for co-ordinated geometry, topography and accuracy. Should any of the data not be within a +/- 10mm sphere of the previously collected data (generally not older that approximately six hours), it is considered incorrect.
The engineering surveyors overseeing the operation evaluate and compare the data with the deviations to the predefined data parameters and quickly decide if measures need to be taken. The co-ordination of displaying the processed data with on-site construction teams helps considerably to complete technical work without disruptions. GeoMoS increases not only productivity uptime by displaying real-time data but also simplifies workflows by constantly validating data before issuing it to the teams.
Dedicated teams and reliable equipment Dedicated round-the-clock operational and
maintenance teams actively maintain the entire Crossrail project’s Leica GeoMoS software solution and also clean and maintain the 42 to 49* total stations and over 1,800 prisms.
The total stations take six people to run, plus an additional part-time support staff of five persons in the field. All involved total stations are serviced and maintained at Leica Geosystems Service Centre in Milton Keynes.
Thurgood of Costain-Skanska concluded: “Crossrail’s motto is ‘Moving London Forward’.
“Within our engineering surveying team, who run the precise levelling scheme, and the largest Leica Geosystems homogeneously adjusted total station scheme in the world, we adopted a complementary motto due to the success we’ve had – ‘Moving surveying for monitoring forward’.
“None of the above however would be possible without the continued support of Leica Geosystems and its supply chain partners.”
* The variation is due to working environment changes.
E:
natalie.binder@
leica-geosystems.com FOR MORE INFORMATION
rail technology magazine Aug/Sep 14 | 41
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