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

Authors:ÖzgürAvci＆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的分销合作伙伴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.

A bridge of national and international significance

The 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

精确定位笼子（在塔楼基础中使用的水密固定结构）和塔楼本身对于桥梁的建造至关重要。塔楼的部分是异地制造的，设计公差非常紧，因此将结构拼凑在一起时毫米的分数。为了监视构建过程中制造块的实时定位，黄和他的团队使用了16Leica GM30 GNSS receivers for monitoringwith 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 reference servers三个Leica AR10 GNSS天线. 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监视软件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。

Regular reports on weather conditions are crucial in suspension bridge construction

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，为黄的团队节省了时间：“现在将实时收集的所有数据组合在一起，并立即显示Geomos的准确结果！加快了我们在办公室和现场运营的过程。”现在，Leica Geomos！是一个基于Web的应用程序，可通过任何基于Web的设备围绕时钟访问监视项目数据。可以定制仪表板，以为不同的用户和作业功能（例如工程师或制造团队）提供易于阅读的报告。能够即时访问数据可以允许任何问题的早期检测和解决。

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

“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.

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