Tunnel construction places high demands on surveying. When work takes place below ground, there are not the same opportunities for clear lines of sight and satellite positioning as above ground, while even small deviations can have significant consequences later in the project.
Mätkonsult provides professional surveying services for tunnel, rock excavation and infrastructure projects and can support the work from initial establishment and setting out through continuous verification to final documentation.
Correct positioning throughout the tunnel
In a tunnel project, the project's coordinates and elevations need to be transferred from the surface down into the underground working area. The surveying control system must then be maintained and verified throughout the project.
Our surveyors can assist with, among other things:
- establishment and verification of survey control networks
- transfer of coordinates and elevations into the tunnel
- setting out of tunnel geometry
- setting out of centre lines, profiles and elevations
- verification of alignment and position
- surveying of rock surfaces and tunnel profiles
- verification of excavated and completed surfaces
- surveying before and after different stages of construction
- quantity and volume calculations
- as-built surveying and documentation
- preparation of digital data for design and construction
The service can be adapted from individual surveying assignments to continuous surveying support throughout the entire construction process.
Why is surveying so important?
Small errors can become significant over distance
A minor deviation in alignment or elevation can develop into a significant error over longer distances. Regular verification makes it possible to identify deviations at an early stage.
The construction team gets the right information in the right place
Setting out provides the contractor with clear and accurate information for rock excavation, structures, installations and other construction activities.
Verification during construction
Through recurring surveys, the actual construction can be compared with the design geometry while work is still in progress.
Better documentation
Completed construction and excavation can be surveyed and documented, with the results incorporated into the project's digital data and as-built documentation.
A common reference throughout the project
A stable and well-verified survey control system provides a common geometric reference for the different parties involved in the project.
In a tunnel, getting the measurements right once is not enough – precision must be maintained throughout the entire project.
Mätkonsult combines extensive experience in construction and infrastructure surveying with modern surveying technology and digital workflows. We can work closely with the construction team and provide support with everything from survey control networks and setting out to verification, surveying and final documentation.
This means that the client receives more than individual surveys. Mätkonsult can provide the surveying link between design and actual construction, helping to ensure that the correct geometry is maintained throughout the entire project.