桥接大陆鸿沟: monitoring construction of a landmark bridge in Turkey

Case study

Canakkale Bridge Monitoring Turkey 2480x750px

Authors:Özgür Avci &T/F/D

When finished, the1915Çanakkale Bridgein Turkey will be the longest mid-span suspension bridge in the world. At just over 4.6 km, it will span the Çanakkale Strait and complete a new southerly motorway route between Turkey and the rest of the European continent. Four partner companies are working on the complex build as a joint venture, Limak and Yapı Merkezi from Turkey, Daelim and SK E&C from South Korea (DLSY JV). The partners contribute global technical expertise and experience to each phase of the project, started in 2017. Kwangsoon Hwang is the Survey Manager at DLSY JV, overseeing the survey aspects of the construction and monitoring geometry control. During the tower building phase, Hwang’s challenge was to gather reliable data on the real-time positioning and long-term monitoring of the pylon towers. Using Leica Geosystems equipment, installed byLeica’s distribution partner SISTEM A.S., Hwang and his team completed the survey works on time, with maximum precision. After the initial construction, the equipment will serve as the permanent monitoring system for the bridge.


使用Leica Geosystems监视设备的Canakkale桥梁监视-1

国家和国际意义的桥梁

1915年çanakkale桥梁和Malkara-cousakkale高速公路项目是对运输和基础设施的大规模投资,旨在为土耳其的经济做出重大贡献。这条新路线将减轻当前的高速公路连接的压力,该通道通过伊斯坦布尔。这将使商业和旅游旅行变得更加容易,使土耳其更加接近欧洲和巴尔干。除了其实质性的商业重要性外,桥梁的象征意义也受到其一些设计元素的尊重。桥的塔腿之间的2023个元元中跨度象征着土耳其共和国成立的100年。相比之下,海拔318米的塔高度象征着1915年3月18日çanakkale的胜利,Çanakkale胜利是土耳其为争取独立斗争历史上最重要的日期之一。


使用Leica Geosystems监视设备的Canakkale桥梁监视-2

Accurate positioning data was critical to constructing the towers

Accurate positioning of the caissons (watertight retaining structures used in the towers’ foundations) and the towers themselves are critical in the construction of the bridge. The sections of the towers are manufactured off-site, and the design tolerances are exceptionally tight so fractions of a millimetre matter in piecing the structure together. To monitor the real-time positioning of the fabricated blocks during the build, Hwang and his team used 16Leica GM30 GNSS接收器用于监视with 16Leica AS10 GNSS Compact GNSS Antennas, four on each tower.

Each pylon consists of two towers.Leica GNSS Spider softwarewas used to calculate the positions of each receiver, employing three units ofLeica GR30参考服务器with threeLeica AR10 GNSS Antennas. Hwang explains that they received data in “real-time, 15 minutes, 30 minutes, one hour and two hours baseline processing from the Spider software. TheLeica GeoMoS monitoring softwarecalculates the average position of baselines which are calculated from three references. The data collected was used for geometry control of the Towers in order to install the towers within specified tolerances.” The Leica Geosystems monitoring solution provides easy access to all available data from all GNSS units in one convenient location, helping the users in the field and their colleagues in the office to be most efficient. Real-time positions were used by the Bridge Fabrication teams to monitor the positions and verticality of the towers, making sure that they were safely and accurately slotted into place.


Regular reports on weather conditions are crucial in suspension bridge construction

除定位数据外,风速和方向数据以及温度传感器数据还通过Leica Geomos软件吸收。最新的图形和常规报告很快由GeoMoS Now! monitoring web-service,saving time for Hwang’s team: “The possibility to combine all data collected on site in real-time and display the accurate results in GeoMoS Now! speeded up our processes at the office and the operations on site.” Leica GeoMoS Now! is a web-based application that provides round the clock access to monitoring project data via any web-based device. Dashboards can be customised to provide easy-to-read reports for different users and job functions, for example, engineers or fabrication teams. Being able to give instant access to data allows for early detection – and resolution – of any problems.


易于使用的系统在数据收集,处理和培训上节省了时间

After accuracy, the main benefit of the solution to Hwang and his team was the ability to save time and work faster. This included the training, which was a quick process because the Leica Geosystems equipment is intuitive to use. Hwang explains, “We needed to train all the personnel who will be using this solution. It took almost no time to easily adapt to the solution with the help of manuals and training provided by Leica’s authorised dealer SISTEM A.S. During the project they also provided 24/7 on-site and remote support related to any problem faced at the construction site.”


正在进行的监控以确保桥梁乘客安全

“Since the towers have been completed, the product will be used for the cable installation and after the full completion of the project, it will serve as the permanent monitoring system for the whole bridge,” explains Hwang. Leica GNSS Spider was configured to calculate baselines in post-processing mode, and the high-accuracy results are archived in the GeoMoS database, from where periodic reports are generated. Leica GM30 GNSS monitoring receivers, as well as Leica AS10 GNSS antennas, are designed for continuous operations with low energy consumption and are rugged enough for challenging weather conditions – ideal for a bridge at altitude, exposed to the elements. Because installation on large and sensitive structures is difficult and expensive, they are also designed to be future-proof by exceeding the signal needs required today. They will still be in place when the 1915Çanakkale Bridge and Malkara-Çanakkale Motorway is completed in 2022/2023, watching over commuters and travellers for many years to come.

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