Fighting time and tide to capture a 5-hectare coastal construction site in 3D

Author: Hazlinda Mohd Nuron

In 2016 the construction of Hyosung Vina Chemicals Port began in the Ba Ria-VungTau province, southern Vietnam. A collaboration between the Vietnamese Government and South Korean industrial conglomerate Hyosung Corporation, the new port is a part of the Hyosung Chemical Complex. Once completed, the Hyosung Chemical Complex will include a propane dehydrogenation (PDH) production plant, a polypropylene (PP) plant, a liquefied petroleum gas (LPG) storage tank and an LPG and petrochemical product warehouse in the Cai Mep Industrial Zone in Ba Ria-Vung Tau, located near Ho Chi Minh City.

One of the final tasks in the development was the construction of the port’s LPG jetty. With over 30 years’ experience in marine, waterway and transport infrastructure,Portcoastare Vietnam’s leading port and coastal survey consultants. The company was engaged in creating the 3D mapping for the topographic survey, the as-built model of the LPG jetty and facilities, and to conduct the inspection report for the revetment protecting the jetty.

地形测量覆盖面积超过5 hectares – and with much of the area located in the water, Portcoast’s level of specialist knowledge and experience was essential for collecting data in these hard-to-reach areas. To compound the inaccessibility challenges, whilst some areas of the complex were still under construction, others were already operational.

Dr. Hoang Hiep, the Portcoast team leader on the project commented,“扫描整个港口的主要挑战是在一个综合处的扫描位置进行选择，那里的交通流量很大，而正在进行的建筑工作的干扰可能会损害精确扫描所需的稳定性。”

To mitigate the challenges of working in this disruptive, heavy traffic environment, Portcoast decided to conduct the scans from elevated locations above the internal road.

Portcoast的Hoang Hiep博士解释说，“Working from high above the site required a scanner which could deliver a high level of precision over a long measurable range. The Leica ScanStation P50 delivered an accuracy of up to 3mm so we could cover the full range with confidence and precision.”

而扫描P50was used to capture the data on top of the bridge, under the bridge the team used specially modified equipment, such as customised cranes to install theLeica RTC360andLeica BLK360to measure and capture highly-detailed data in the complex, narrow and inaccessible areas, such as the liquid tanks, the pipeline systems, access bridge and the marine loading arm.

Time is money

承诺为该地区提供巨大的经济利益，据估计，该项目在建设过程中就为大约2,000名工人创造了就业机会。一旦完成，该港口估计每年为州预算贡献8000万美元，因此必须确保港口能够尽快完全运行。因此，速度是选择Portcoast设备和培训团队使用此设备的关键因素。

“不仅与Leica Geosystems团队合作，该团队的训练时间几乎使一半了，而且使用Leica设备捕获数据的高速速度大大减少了调查时间。在这样的项目中，沿线的地形调查通常需要大约12个小时的时间，而每个设置的调查网格为20m。而使用ScanStation P50时，它可以减少到3小时。加速该过程还减少了我们的运营风险和这项工作所需的员工数量，”explained Dr. Hoang Hiep.

Enhancing collaboration between site and data analysis office

To scan the port, Portcoast needed to combine thousands of points and to combine the data from different devices, such as total stations, GNSS and laser scanners – something that would usually prove to be a very complex and time-consuming process. The seamless integration of Leica Geosystems’ equipment and software solutions meant the data could easily be passed between the off-site team processing the data and the field team.

Portcoast在巴基斯坦和美国东南亚的类似项目中工作，特别意识到热带国家快速数据传输的重要性。迅速变化的天气状况要求在现场和办公室团队之间快速数据传输，以验证数据并防止任何数据丢失。从大地设备中收集点云数据后，Portcoast使用了Leica Cyclone，，，，Leica Cyclone 3DRandLeica Infinityoff-site to process the data.

“捕获现场数据的高速和高级准确性有助于避免办公室后处理的延迟，因为该软件帮助我们每次需要时检查了这些点。有了无穷大和CONX，很容易在1分钟内在现场和办公室之间传输数据，”added Dr. Hoang Hiep.

“The outcome map produced by Cyclone is a very accurate model, which we can use to create a 3D model and VR system. Using Cyclone 3DR we can then further refine the model to provide high levels of accuracy and visibility.”

通过在不同时间收集点云数据并使用Leica CloudWorx for Revitto convert this into as-built drawings, the margin (a matter of millimetres) for settlement or displacement of the pipe racks could be estimated with the utmost precision.

The as-built drawings and BIM will support the Facilities Management aspect of the port providing a reference for the inspection report and enabling Hyosung to plan and model future developments and renovations for the port using the digital model.

The work that took the team of seven engineers just weeks to complete will significantly reduce the site visits required for future maintenance and can be used to enhance and protect the operations of the port for decades to come.

“When we took on this project, only half of the team had any prior experience with this geodetic equipment. The increased efficiency from the integration across the Leica Geosystems product ecosystem saved considerable time, and now the whole team is eager to use the Leica Geosystems geodetic equipment regularly,Hoang Hiep博士总结说。