扫描无人管的高流量道路

Author:Kiew Tian Lim

The Singapore Land Transport Authority’s (LTA) motto isWe Keep Your World Moving. The organisation had committed to it with the construction of Mass Rapid Transit (MRT) System – Thomson-East Coast Line (TEL), which enhances rail connectivity cutting across from North to South corridors of the city. The new MRT line will greatly enhance the accessibility to the Central Business District and Marina Bay area.

Significantly improving travel time for commuters, the construction of TEL includes 43 kilometres of underground tunnel from Woodlands North Station to Sungei Bedok Station. With 4.5 km of tunnels underneath the dual three-lane heavy traffic Seletar Expressway (SLE), monitoring is of paramount importance where the contractor is to ensure negligible road deformation or disturbance that will affect the traffic flow.

工程公司TRITECH工程与测试PTE LTD签订了合同，以实时使用全自动监控系统监视道路表面。为了提供这项服务，由于严重的环境和高度严格的监视要求，Tritech是由Leica Geosystems的监视解决方案启动的。

激光扫描和总站

使用Leica Nova MS60多站以及Leica Geomos监控软件V6，然后Tritech能够建立一个自动道路监控系统（ARMS），涵盖受隧道钻孔机（TBM）影响的两公里临界SLE的临界点，下。Leica Geosystems多结构化的基本激光扫描功能以及无反射和棱镜测量的结合进行了救援，因为在道路上的棱镜安装很容易被通行车辆销毁，这不是该项目的选择。

“借助MS60 mulitStation，我们能够设置手臂，提高生产力为无人测量系统，”said Dr. Tor Yam Khoon, registered surveyor with Tritech Engineering & Testing (S) Pte. Ltd.“The system also serves as an effective measuring system delivering the results wirelessly soon after the completion of a measurement epoch.”

系统的自动扫描能力启用了变形信息的快速传递。凭借GEOMOS图像辅助扫描区域定义功能，该公司能够将定义的区域添加到测量周期中。对于公司而言，这种联合解决方案有助于增强：

• Accuracy and reliability;
• 监控数据的快速解读;和
• 正确的补救决策。

“ Leica Nova MS60是全站的良好混合物，使用新Leica Geomos N.VEC技术使用玻璃棱镜和表面对点的变形监测有用。在这一道路表面监测项目中，已经很好地证明了N.VEC技术在水平表面上的成功应用，”said Dr. Tor.“绝对最好从至少500个读数的扫描贴片而不是单个反射式读数中得出变形的向量。”

The data of the eight MultiStations used on the project was collated in Tritech’s proprietary automated structured monitoring system. The automatic monitoring system, with ability to measure at four hourly cycles, seven days a week, of the MultiStation and GeoMoS translated into major cost savings in labour.

收集的数据来自多站设置在the road shoulder on a 4-m-high observation platform at the middle of four rows of patches of road surface at 25 m apart. These four scan patches were defined in rows crossing the road over the white lane markings. These 16 regular scan patches are monitored at regular intervals. Between each 25-m regular monitoring zone there were also defined with “standby” scan patches at 5 m apart. These standby scan patches will be added to the monitoring scheme for automatic monitoring cycles whenever there is a planned or unplanned cutter head intervention. While the above MultiStation is in active monitoring, another one will be setup ahead and ready to go when the TBM enters its monitoring zone.

Support from abroad

For such a precise setup, there were initial challenges. Leica Geosystems staff in Singapore worked diligently with support staff in Switzerland to quickly diagnose the setup issues and effectively resolve them.

“When there was a need to change the MultiStation in the midst of the monitoring campaign, there were no adverse effects to the project due to a timely and effective response by Leica Geosystems technical support,”said Dr. Tor.

Leica Geosystems的监视解决方案支持LTA履行其诺言，并使世界在重大建筑项目中迁移。