Bridging the continental divide: monitoring construction of a landmark bridge in Turkey

Authors:Özgür Avci &T/F/D

When finished, the1915Çanakkale Bridge在土耳其将是世界上最长的中跨悬架桥。它将刚好超过4.6公里，它将跨越Çanakkale海峡，并在土耳其和欧洲大陆其他地区之间完成一条新的南部高速公路路线。四家合作伙伴公司正在从土耳其，DAELIM和SK E＆C的合资企业，Limak和YapıMerkezi（DLSY合资公司）（DLSY合资公司）工作。合作伙伴为该项目的每个阶段贡献了全球技术专长和经验。在塔楼建筑阶段，Hwang的挑战是收集有关塔塔的实时定位和长期监控的可靠数据。使用Leica Geosystems设备，安装Leica’s distribution partner SISTEM A.S.，Hwang和他的团队以最高的精度按时完成了调查工作。最初的施工后，设备将作为桥梁的永久监控系统。

A bridge of national and international significance

这1915Çanakkale Bridge and Malkara-Çanakkale Motorway Project is a mega-scale investment in transportation and infrastructure set to make a significant contribution to Turkey’s economy. This new route will take the pressure off the current motorway link, which travels through Istanbul. It will make commercial and tourist travel easier, bringing Turkey closer to Europe and the Balkans. As well as its substantial commercial importance, the symbolic importance of the bridge is honoured by some of its design elements. The 2,023 metres-long mid-span between the tower legs of the bridge symbolises the 100th year of the foundation of the Turkish Republic. In contrast, the tower height of 318 meters above sea level symbolises the 18th of March 1915 Çanakkale Victory, one of the most important dates in the history of Turkey’s struggle for independence.

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 receivers for monitoringwith 16Leica AS10 GNSS Compact GNSS Antennas，每个塔上的四个。

每个塔由两座塔组成。Leica GNSS蜘蛛软件was used to calculate the positions of each receiver, employing three units ofLeica GR30 reference serverswith threeLeica AR10 GNSS Antennas。Hwang解释说，他们从Spider软件的实时，15分钟，30分钟，一小时和两个小时的基线处理中收到了数据。这Leica GeoMoS monitoring software计算基线的平均位置，这些位置是从三个参考文献计算得出的。收集的数据用于对塔的几何控制，以便在指定的公差内安装塔。”Leica GeoSystems监视解决方案可轻松访问一个方便的位置中所有GNSS单元的所有可用数据，帮助该领域的用户及其办公室中的同事最有效。桥梁制造团队使用实时位置来监视塔的位置和垂直性，以确保将它们安全，准确地插入到位。

关于天气状况的定期报告在悬架桥建造中至关重要

In addition to the positioning data, wind speed and direction data, as well as temperature sensor data, were assimilated by the Leica GeoMoS software. Up-to-date graphics and regular reports were quickly generated by theGeoMoS Now! monitoring web-service黄,节省时间的团队:”的可能性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.

Easy to use system saved time on data collection, processing and training

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.”

Ongoing monitoring to keep bridge passengers safe

“由于塔楼已经完成，因此该产品将用于电缆安装，并且在项目完整完成后，它将用作整个桥梁的永久监控系统，” Hwang解释说。Leica GNSS蜘蛛被配置为以后处理模式计算基线，并且在Geomos数据库中存档了高准确的结果，从生成周期性报告。Leica GM30 GNSS监控接收器以及Leica AS10 GNSS天线设计用于低能消耗低的连续操作，并且足以挑战天气条件 - 非常适合在高空的桥梁，暴露于元素上。由于在大型和敏感的结构上安装很困难且昂贵，因此它们也通过超出当今所需的信号需求而设计为未来。当1915çanakkale桥和Malkara-cousanakkale高速公路于2022/2023完成时，他们仍将到位，并在未来多年观看通勤者和旅行者。

For more information contact the monitoring solutions specialists at Leica Geosystems.