Leica Geosystems TruStory Monitoring System for Airport Express Line

Challenge There are 3 sections of railways settlement measurement, included tunnel, trough and ballasted sections of total 1.2km, total 18 Total Stations and 600 prisms needed for measurement, Leica GeoMoS measurement cycle with 2 hours each. Running for 24 hours for 36 months non-stop. There are only 2 hours at night and 2-3 days per week to get the installation work and the tasks needed to be finished in two months time. After the system running, everyday, it is necessary to get a line safety report on 5:00am morning to all the related engineers and station manager for status of the railway in order to commerce the construction work.

Customer The -Canton Railway Corporation/ Hong Kong

Date The project connects the East Rail with the West Rail of the December 2005 Kowloon-Canton Railway. Project Summary Instruments The Kowloon Southern Link (KSL) the construction works do not Leica TCA2003 and prisms will be a 3.8 km connection have serious structural effect and Field Metro sensor, stand, pillar, between the East and West Rail distributing daily operation and cable running for 2 km. in Hong Kong. The construction safety of the Airport Express Rail, Office of the $8.3 billion KSL is an Automatic Deformation Workstatons, Web Server with Web Interface, scheduled for completion in 2009. Monitoring System is deployed Leica GeoMoS Professional The Kowloon-Canton Railway mainly to continuously monitor Corporation (KCRC) in Hong Kong settlement along the affected rail Benefits: acquired an Automation track. • Real time continue monitoring system with SMS, email alert, web interface for client to Deformation Monitoring System get the data in real time. from Leica Geosystems in The 1.2km track is divided into • Continue monitor the progress of the December 2005 for continuously three different sections (600m, contractor work if the work disturb the monitoring settlement and overall 210m and 400m) for continuously railway systems deformation of a section of monitoring where cover ballasted • Eliminate the 24 hours manual measurement existing Airport Express Railway. section, trough section and tunnel on MTRC railway and tunnel which are section. A pair of mini prisms with dangerous and labour intensive. The Kowloon Southern Link project is tailor-made protection is installed • Complement the existing geotechnical a 3.8 km extension of KCRC's West in every 13 m interval along the sensors work Rail Link from rail track. TCA2003 Total Station connecting to East that are driven remotely via a data Station of KCRC's East Rail Link. There communication network by Leica is about 1.2km of the new extension GeoMoS software at the Control area located very closely to the Center measure the positional existing Airport Express Rail and MTRC change of each target prism Line. In order to ensure automatically in every 2 hours Through section (210 m) Total station configuration in the Through section.

interval. To get the best line of afterward. Thus, even any SMS. At the same time, the alarm sight for measurement, those structural movement happening and a report will also be Total Stations are installed at vari- at the Total Station location does automatically sent to those ous locations including tunnel wall, not have any affect to the overall persons by email. Thus, engineers roof of rail station and structure measurement accuracy and the and surveyors can verify the along the track. There is system can achieve less than 1mm settlement immediately and take continuous power supply at each measurement error over a distance necessary actions to prevent Total Station location and they are of 100m. damages and maintain rail safety well protected by special design to passengers. As said by Mr. mounting device and security lock. The measurement reading is Andrew Wong, Engineering transmitted to Leica GeoMoS Solution Manager of Leica To ensure achieving the highest software for computing the Geosystems: “It is a well-proof accuracy and reliability of the rail updated coordinates of all solution for engineer making quick deformation measurement result, monitoring points. Then, and right decisions and also take the highest accuracy automatic coordinates comparison can be necessary actions regarding the Total Station available in the made against the initial reading influence of new construction current market - Leica TCA2003 is and the deviation and trend of works to existing structure”. used, which can achieve +/-0.5” movement can be easily presented angular accuracy and 1mm +/- as numeric and graphical The system installation works since 1ppm distance accuracy. presentation report to engineers February 2006 for a period of 36 Thanks to the automatic target and surveyors every 2 hours. months continuously. reorganization technology built in All the information can be found the Leica TCA2003, it can from an Intranet webpage and automatically pin-point the center engineers can also remote control of each target prism and detect the system configuration and slight positional changes. monitor its performance via the Furthermore, before taking every Ethernet. They can also preset cycle of monitoring points various levels of settlement measurement, each Total Station tolerance in the software, so also first measures assigned when the measurement result control reference points located at reach the critical level, then stable structures (reference various alarm messages will be prisms) and then re-adjust its own automatically sent to all mobile position and monitoring reading phones of assigned persons via

Leica Geosystems AG Heerbrugg, Switzerland www.leica-geosystems.com