Rail and tunnel monitoring
Movement monitoring of tunnels, rail structures and underground assets affected by nearby construction, surveyed and reported to the requirements of the asset owner's protection agreement.
Protecting underground assets
When construction happens near tunnels or rail structures, the asset owner needs evidence that its asset is not being damaged. Asset protection agreements with owners such as TfL, Network Rail and Thames Water typically set movement triggers, monitoring frequency and reporting formats, and the monitoring has to meet them.
Working to third-party requirements
Tunnel and rail monitoring is work where access is tightly controlled, accuracy matters and reports have to satisfy a third party. We plan installation and readings around the access windows the asset owner allows, and report in the format their engineers expect.
Methods
Depending on the asset and the agreement, we use prism monitoring with total stations, precise levelling for vertical movement and automated total stations where continuous data is required.
How it works
Agree requirements
Work with the engineer and asset owner to define monitoring points, frequency, triggers and reporting.
Install and baseline
Install monitoring within the permitted access windows and establish a baseline before works.
Monitor and report
Readings and reports to the agreed schedule, with immediate escalation on triggers.
Who we work with
Developers and contractors
Monitoring required by an asset protection agreement next to your works.
Engineers
Data that satisfies third-party technical approval.
Asset owners
Independent records of how your asset responded to nearby works.
What clients say
Read our reviews on Google★★★★★
We have used THS Concepts for multiple surveys from topographic to drone photogrametry, they are professional and prompt and deliver exactly what is requested. Highly recommended.
★★★★★
We was looking for a local company to survey our setting out on our new build project and came across THS, We are VERY happy with the service they provided, Tom visited the site and was very helpful and professional. providing a detailed description and was very thorough. we will defiantly be using THS in the near future.
★★★★★
I contacted Tom to carry out a Topographic survey, and cannot recommend them enough. Nothing was to much, and I was kept up to date with everything as it happened! Great company to deal with and reasonably priced.
Rail and tunnel monitoring: common questions
Why do works near tunnels need monitoring?
Excavation, piling and loading near tunnels can cause movement. Asset owners such as TfL, Network Rail and Thames Water usually set explicit movement limits in their agreements, and monitoring shows they are met.
Do you work within possessions and restricted access?
Yes. Installation and readings are planned around the access windows the asset owner allows. Where access is very limited, automated or mobile scanning methods help.
What monitoring methods do you use?
Prism monitoring with total stations, precise levelling and automated total stations, chosen to suit the asset and the agreement.
Related services
- 3D laser scanning
Point clouds and BIM models of buildings, plant and structures.
- Setting out
Gridlines, foundations, piles and roads set out on site.
Tell us about your site
Send a location, a rough brief and your deadline. We reply with a fixed quote within 24 hours.