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The third bridge above the Bosphorus, with its over 300 metre high pylons pairs, is a monumental masterpiece of engineering. It will help to reduce traffic between the Europe and Asian continents and is equally a symbol of Istanbul’s prosperity and economic growth. The Yavuz-Sultan-Selim Bridge is being built by the Turkish company, ICA Construction, and creates not only a motorway with a railway line, but also an additional connection for the transcontinental metropolis between the two continents. During the construction of the suspension bridge, the Leica Nova MS50 demonstrated its many diversified application possibilities.

ICA utilised the Leica Nova MS50 MultiStation, along with the Leica Viva GS15 GNSS receiver and other additional Leica Geosystems sensors, during construction for a great number of surveying, control and deformation measurements. With the new scanning function, the latest construction progress of the pylons could be compared with the architectural plans.

桥梁施工中最高桥梁
四个巨大的塔架连接了这座桥的子结构。高度为309米（约1014英尺），它们是全球任何悬架桥上的最高点。这两个倾斜设计的幽门对完成了桥的顶部，内部空心。每天，这些塔架都会增长约2.5米（8,2英尺） - 为工程师造成挑战，他们必须不断检查与塔架的不断增长的外部混凝土壳的设计偏差。由于对施工要求的严格需求，只有很短的时间可供选择检查塔架，尽管如此，这些控件绝对势在必行。因为与设计的任何小偏差都会对桥梁结构的后续阶段产生巨大影响。

Leica Nova MS50的激光扫描功能和长距离测量用于确定对设计的混凝土表面偏差，并用Leica Cyclone Point云软件加工。为了实现扫描数据的最高精度，在使用Leica Viva GS15 GNSS静态观测和在Leica Geooffice进行处理的控制点设置MS50。

额外的挑战是进行这项工作的恶劣环境。博斯普鲁斯海峡将黑海连接到马尔马拉海，工人必须与寒冷的风，与阴霾和湿度一起抗衡，可以在整个冬季持续存在。所有用于该项目的Leica设备都可以轻松应对这些具有挑战性的条件。Leica Nova MS50的工作温度范围为-20°C至+ 50°C和IP65灰尘和防水。

High-quality measurements
大部分工作是从三个地面控制点进行的。两个位于附近的山坡上，为定向塔和施工现场提供清晰的视线，并每周进行排量控制，以检查坐标是否稳定，并与建筑设计进行比较偏差。

另外，使用几个Leica TS30总站检查塔旋的垂直对准。bob apple在不同位置建造期间拍摄测量，以便在建造计划的实时验证准确性。

The Nova MS50 was set up over the control points, a scan window defined and a point cloud measured with a density of 1 cm every 100 m over a distance of 150 m. After collecting scan data from all sides of the pylons, vertical slices, created in Leica MultiWorx were checked against the design (CAD) data.

Fast and accurate scans
Surveying manager Yasar Hacieyupoglu commented, “We had complete confidence in the Leica Nova MS50 and Viva GS15 GNSS receivers to deliver the accurate long range measurement required for this project. The Nova MS50 is the only instrument which can scan accurately and at speed over the range required.”

“Leica Geosystems一直是该项目的合作合作伙伴 - 建筑公司ICA，Hyundai Eng。和调查团队，endem缺点都使用Leica Geosystems的产品，并知道他们可以依靠他们从制造商和市场领导者收到的支bob综合app下载持，培训和服务。“

Written by Ruth Badley