Improving the railway infrastructure of a capital city

Author:职员

每天都有成千上万的通勤者进入首都，伦敦的更多火车是帮助交通拥堵的加油。

作为Brighton Mainline升级计划的一部分，每小时将在早晨的高峰期提供另外六列火车。随之而来的是，该计划还将在2043年再加上另外两列火车的额外服务。通过隔离流量，绩效也将提高性能，并为路线上的额外火车路径做出贡献。

伦敦的铁路基础设施中，需要进行地形调查。该程序提供了升级到更新，更快，更有效的解决方案以捕获数据的理想时间。

Network Rail, the government entity in charge of the programme, turned to Atkins to perform the surveys.

A major upgrade

Established in 1938, Atkins is one the world’s most respected design, engineering and project management consultancies. Working closely with a wide range of clients from different sectors and regions across the public and private sectors and local and national governments, Atkins delivers long-term trusted partnerships to create a world where lives are enriched through the implementation of ideas.

Atkins Rail Division, based in Croydon, Surrey, United Kingdom, has been using Leica Geosystems surveying equipment for almost 20 years. The decision was made last year to replace the majority of the consultancy’s trusted but aging fleet of Leica System 1100 and 1200 total stations and to add to the firm’s existing GNSS, digital levelling and traversing equipment with the latest Leica Captivate solutions.

This major upgrade saw a broad spread of instruments:

• 1 Nova MS60 MultiStation
• 7 Viva TS16i Imaging total stations
• 4 Viva GS14 GNSS Smart Antenna
• 10 Captivate CS20 controllers
• 2 Captivate CS35 tablet computers
• 2 LS15 auto focus digital levels
• 8 full traverse kits

有了新的投资组合，阿特金斯准备接受重要的铁路项目。

场地限制和挑战

To enable the additional programme paths toward London Victoria and London Bridge, there was a requirement to segregate flows at Windmill Bridge Junction. It would support performance improvement on the route through the segregation of key train flows, which currently transfer reactionary delays across the other adjacent lines and the wider South London network.

To achieve additional train stopping capacity at East Croydon, there was a requirement for additional platforms to be constructed. In addition to safely delivering a 12-car train operation between Selhurst and Gloucester Road Junction, infrastructure was required to accommodate a 12-car train on the Selhurst Spur.

As a result, feasibility options were developed to achieve these outputs. The options include:

• Grade separation of Windmill Bridge Junction,
• Selhurst Spur的延伸
• Additional track between Windmill Bridge Junction and East Croydon
• Two additional platforms at East Croydon.

It was identified that work would be required at East Croydon station to safely deliver the required passenger access to new platforms and provide sufficient increased passenger capacity on the concourse.

“As with all railway topographical surveys, the limitations of site access and the nature of railway infrastructure constrains the way we conducted the survey,” said Matevz Groboljsek, Atkins Track Team project manager. “This was especially true on a project area of this scale and considering the complex junction and train routing available through the section of the infrastructure.”

Leica Captivate solutions helping the world of rail

With accuracy and reliability paramount in the rail environment, Atkins turned to Leica Geosystems’ solutions and technology to avoid costly downtime during expensive and time restrictive track possession. The latest innovations available within the new Leica Captivate range proved invaluable in this situation.

该项目使用了Leica Nova MS60多稳定功能广泛传播，包括每秒扫描1000点的能力。结合所有总站的成像功能，以及与Leica CS20控制器和CS35平板电脑的互操作性，这使Atkbob appleins能够以最快和最有效的方式捕获所有必要的细节。

The same controllers and Captivate software were used with the GNSS Smart Antennae to establish control quickly and accurately using HxGN SmartNet correction service. Alongside the Captivate software, the latest Leica LS15 digital level with imaging and auto focus were used, allowing for a faster, more accurate staff reading in harsh conditions. The instruments were also used in conjunction with track trollies and alongside Leica Geosystems laser scanning solutions.

The provision of topographical survey data and selected point clouds for the project designers to use and develop created a rationalised railway infrastructure design that will increase capacity on an already packed section of South London’s rail network. Ultimately this will declutter historical track alignments, making them suitable for rail expansion into 2020 and beyond.

该项目及其提供的数据将为不断增长的客户群提供更好的铁路体验，并将用于支持周围地区的经济增长。

Providing topographical surveys to London’s railway infrastructure

For Atkins, Leica Geosystems solutions have brought many benefits to the project.

“采用莱卡吸引软件技术,we can provide Network Rail with fast and accurate data realisation, avoid costly returns, and save them time and effort, whilst also reducing their risks,” said Groboljsek. “By using a combination of Leica Geosystems solutions, data was collected safely, accurately, efficiently and, above all, within limited time during track access possessions. Reduction in time spent on the track reduced site-based risks and lessened risk of injury to Atkins personnel. Also, there was a reduced risk to Network Rail property and infrastructure.”

使用来自HXGN SmartNet的后处理和实时RTK数据，使用快速准确的Leica Viva GS14 GNSS智能天线建立了初级和二级控制。该服务还用于通过直接在现场中确保3D GNSS数据的质量来提高效率。

借助现场和办公室中的直观且易于理解的软件，Captivate允许即时3D可视化在铁路站点上收集的调查数据，从而详细了解项目要求。

Leica ScanStation P40激光扫描仪还提供了快速扫描速率，噪声和更清晰的扫描以及从现场到办公室的简化工作流程以及通过Leica Cyclone激光扫描软件返回的简化工作流程。然后，使用Leica Truview快速，很容易地与所有员工和客户沟通。

The Brighton Mainline Upgrade Programme upon completion is one of the first where the topographical survey was used much earlier in the project lifecycle. Combined with Leica Captivate solutions, the rail project is delivered smoothly allowing for the design team and surveyors to proactively manage and transmit decisions based on immediate feedback.