How laser scanning is changing the way FAM Construction (Ferrovial – Allan Myers) collects site information on their roadway projects

Author:Frank Collazo

Washington D.C. has some of the worst traffic congestion in the USA. Along with relieving congestion, improving safety, and moving 2,000 to 4,000 more people hourly, this 22-mile roadway expansion project will transform this critical Northern Virginia artery by adding two additional express lanes, three regular lanes in each direction, interchange enhancements, toll roads, park and ride lots and shared use paths.

With the aid of3D laser scanning，这个项目正在改变方式FAM Construction收集站点信息，报告更改并确保一切都在设计公差之内。

FAM的调查经理Gabriel Jimenez Lopez说“With scanning, I don’t have to imagine anything, it is a highly accurate 3D picture of the construction site sitting on my laptop, better yet, I don’t have to rely on someone’s interpretation of what they think is a break-line or an important feature, and best I don’t have to question if they picked up a critical piece of data. Everything is there all the time”。

现场工作人员

用Leica GS18 T设置2人的机组人员控制，同时将RTC360 3D激光扫描仪放在三脚架上。每个设置的总时间；2分30秒。

Two scanning crews are each equipped with aLeica RTC3603D laser scanner, tablet computer with theLeica Cyclone FIELD 360 app，，，，Leica CS20有限公司ntroller andLeica GS18 tGNSS智能天线。他们是独立于其他测量师的独立人物，因此不需要全站协调，也无需计划在哪里设置控制。

Field Workflow

包括以每次设置30秒的RTK模式设置一个控制点，然后使用Cyclone Field 360 App在中等分辨率扫描并获取HDR Imagery：大约1分钟51秒进行扫描和图像。基本上，在字段中按两个点，一个在CS20上进行控制，另一个在Cyclone Field 360应用程序上进行扫描，然后冲洗并重复。在导入过程中，使用自动提取控制在办公室中提取控件。

当一个项目要求更高的精度（例如监视结构和钢）时，GNSS RTK控制会得到全站控制。

Office

Scans are imported into旋风寄存器360and checked. No need to register or geo-reference because this was done in field via the Cyclone FIELD 360 app. Simply import, check quality, adjust if needed, then export point cloud and useCyclone 3DRfor the many applications it offers. Weather it is checking verticality, auto-extracting ground to create TIN, volume calculations, creating cross-section reports, or checking as-built vs design, Cyclone 3DR covers all this for FAM.

In addition to topo’s FAM uses scanning for:

• 土方计算
• 监视固定墙 - 每周一次检查以确保没有发生移动
• 桥梁甲板在建造过程中为新的和扩展的桥梁工作，以确保满足设计公差
• 高精度测量库存量
• 检查H-Piles的垂直度（即钢）
• Sharing data with other departments i.e. their Construction Technical Office over internet usingtruview
• 分水岭分析
• 桥梁清除
• 检查现有桥梁的结构损坏以维修

观看视频以查看行动中的项目。

Scan of retaining wall with control point

FAM不要一次通过总站检查一次测量的高程和垂直度，而是用RTC360在几分钟内检查数百个H-Piles