Hinkley Point C的坡度移动监控

Case Study

Hinkley Point C Monitoring Case Study Visual

Author:Steve Thurgood

Under construction in Somerset, England, the new Hinkley Point C (HPC) nuclear power station will produce 3.2 GWe of reliable low carbon electricity – enough to power 6 million UK homes. The project goes beyond the supply of low-carbon electricity for around 7% of UK demand. It will bring socio-economic benefits to the region, ranging from increasing local employment to developing a sustainable regional supply chain and advancing new training facilities and qualifications.

HPC的坡度监控程序与Kier BAM合资企业启用作品一起开始，并构成了自动化总站（ATS）系统，倾斜计，延伸计，应变计和压力计的混合物。监视程序共同监视针对特定设计参数的垂直斜率移动。Kier Bam Anafing工程和构造的斜坡为核电站和工作区域创造了基础，以跟随承包商。设置应用的监视解决方案以记录施工和操作阶段的任何斜率运动。

Handling a large-scale project

HPC项目范围意味着任何安装的ATS系统都必须具有集成的光学和GNSS调查控制网络，以将固定的控制从稳定的位置转移到预期看到地面运动的区域内的共同控制棱镜。结合Leica Geosystemsmonitoring solutionand its distribution partnerSCCSwas chosen to deliver the ATS system through considered investigations. The solution comprised ofLeica Nova TM50monitoring total stationsdriven byLeica GeoMoS并支持微泡沫星*净调整工具。该系统每两个小时运行一次，测量斜率监视棱镜的规格±1mm。报告的监测结果报告针对建筑和操作设计触发器 - 超越预期设计的地面运动将实现其他结构地面控制措施。

监视计划和ATS系统的目标是确保针对设计的斜率移动性能，最终确保健康和安全。

图像1（左）：TM50和安装柱，监视发掘。图像2（右）：监视系统和控制棱镜的典型设置与发掘作品相邻

图像1（左）：TM50和安装帖子，监视发掘
图像2（右）：监视系统和控制棱镜的典型设置与发掘作品相邻

选择the right equipment

决定硬件和软件提供商都是关于合作伙伴关系的。对于HPC项目，这是一个关键因素。只有一家公司，无所不包的协作才能满足性能，耐用性和可靠性方面的预期监视需求。

“Hinkley Point C is located adjacent to the Severn Estuary and is exposed to the Atlantic’s prevailing winds. I needed a product that could withstand these conditions, and I believed Leica as a respected and established brand was a safe selection to meet the project requirements,” said Ben Crossland, Senior Monitoring Surveyor at HPC.

在比较了市场上可用的各种解决方案之后，HPC促进了Leica Geosystems及其分销商SCC的集体力量。该决定背后的推理是多层的 - 设备必须承受现场的条件；这些仪器必须完美地执行并使测量师控制网络集成。HPC需要一个“全包”软件包，包括软件，硬件，service and specialist support to meet HPC’s automated total station systems’ needs.

图3（左）：GNSS/360°Prism调查控制点。图片4（右）：带有控制盒，WLAN收音机和安装帖子的ATS

图片3 (left): GNSS/360° prism survey control point
图片4（右）：带有控制盒，WLAN收音机和安装帖子的ATS

The solution

Leica Nova TM50monitoring total stations provided durable and precise instruments with the Leica GeoMoS monitoring software. Survey control measurements were processed by SCCS’s bespoke automatic adjustment script, which uses MicroSurvey Star*Net to adjust the ATS control network before every scheduled array slope monitoring measurement cycle. This system provided a fully integrated network, which would help remove the risk of false movement caused by survey control movement. The applied solution consists of the following components:

Software:

硬件：

Leica LS15数字级别andLeica Nova TS60 robotic total stationare used manually for survey control and manual monitoring verification checks to validate the ATS network was operating correctly. Together with these checks, HPC had sixLeica GMX910 smart antennascontrolled through Leica GNSS Spider software. One antenna sat on a permanent base station; the others were spread out within the work area. The antennas’ positions were co-located withLeica GRZ122 prismsto allow the ATS network to use the positions as fixed control. The integration of survey methods allowed real-time position checks to ensure relatively stable positions are not influenced by construction.In areas where prisms were obstructed, aLeica Nova MS60多阶段was used to scan the relevant zones. The data was then imported to Leica Infinity for cloud comparison. The MS60’s scanning ability was also used within GeoMoS when automated scanning was a preferred option due to impracticality of installing and maintaining prisms in dangerous areas.”

“We placed our GNSS systems differentially – one in a stable position (and fixed), the others in relatively stable positions, that are also considered pseudo-fixed. The potential for the positions to move was the reason for including GNSS as part of the solution. In this way, we could ensure unforeseen movement of fixed control positions that we deemed stable, was captured and addressed,” informed Crossland about the technical challenge. “We started with just prisms then realised our reference frame was flexing,因此，我们询问了供应商的建议，后者通过集成GNSS来帮助解决我们遇到的网络稳定问题。”

We needed to trust the equipment and the expert suppliers

“主要从事供应合作伙伴hip with Leica Geosystems and SCCS are the instruments themselves. This is where we trust the brand. Plus, it comes with great support,” Crossland summarised their experience. “You know what you paid for – the high quality is worth the investment. We are satisfied with how it works and are always eagerly expecting new advancements.”

Another decisive factor was the aspect of everything working together seamlessly. The interoperability is essential to set up a complex system as the HPC monitoring; thus, the GeoMoS platform combined these multiple data sources into a homogeneous monitoring system. Due to the project’s dynamic nature, the ATS system layout changed weekly. The company always strived to optimise the operation as new working zones open/close and improve the monitoring process to keep the workforce safe.

自定义解决方案

Complex projects require the equipment/software provider to understand the customer’s needs thoroughly and always offer suggestions leading towards the optimal solution. The partnership went beyond the mere software/hardware support – with cooperation in operation plan optimisation, and custom builds related to the communication network (e.g., WLAN spanning the entire project).

Typical deep excavation into fractured rock held by sprayed concrete facades with rock anchor bolts, monitored by geotechnical instrumentation and arrays of geodetic prisms with an automated TM50 to ensure the safety of workers in and adjacent to deep excavations.

图片5: Typical deep excavation into fractured rock held by sprayed concrete facades with rock anchor bolts, monitored by geotechnical instrumentation and arrays of geodetic prisms with an automated TM50 to ensure the safety of workers in and adjacent to deep excavations.

It’s all about the data

Every two hours, every day of the year, fully automatically, GeoMoS completes scheduled tasks to instruct the ATS system to collect a series of measurements to compute and update the ATS positions. Once updated, they then measured slope monitoring prisms and computed any deformation. The prism’s movement against a baseline is reported in GeoMoS and automatically sent to our client’s viewing portal MissionOS. Maxwell Geosystems Mission OS combines all HPC monitoring data, survey prism data, inclinometers, strain gauges, piezometers and extensometers. All monitoring data is reviewed through a daily section review group, where movement against construction and operational triggers is assessed. GMX910 data is received in GeoMoS on an hourly basis, which is averaged every 24 hours to enhance data stability, reliability and accuracy from the GNSS. The GMX910-processed average results are used in Star*Net integrated with the ATS network measurements to enable verification of all systems.

A recommendation

Once the slope monitoring project is completed, the stock instruments are assigned to other areas, especially those facing and combating line-of-sight issues, generally caused by construction programmes.

“I can easily recommend Leica Geosystems products. They are very transparent – I like to look into the GeoMoS system data, understand how the system operates, integrating the fine detail of observation and computation. The open access to raw data and log files was especially useful for a surveyor, so I understood how and why my system operated. I’ve used other products in the past which were supplied by 3rdparties and missed that same transparency where you could drill down into specifics of measurement and the data behind it,” Crossland concludes.

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