Renewal & Rehabilitation
The structural safety and serviceability of underground infrastructure must be ensured throughout its life cycle. Minimal shutdown times, optimal usage of available finances and a long-term plan for measures and investments are at the top of most operators’ wish lists.
As part of the condition assessments, we accompany the value conservation of underground infrastructures, starting with the data acquisition, followed by analysing the data and concluding with designing of any remedial measures. This allows for detailed budget planning and foresighted prioritization of the measures for ensuring operational safety.
Services
We place great emphasis on methodical, structured and seamless recording of the structural condition to enable long-term reliability in planning for you. Costs are provided realistically and transparently, thereby providing a high degree of budget reliability.
PHASE 1 - Preparation
- Acquisition of the owner’s data of the structure, such as:
- Layout drawings
- Detailed drawings
- Construction documentation
- Engineering documents
- Organization & coordination of Phase 2
PHASE 2 – Data acquisition
- Laser scanning
- Visual inspection using high-resolution grey-scale images
- Recording of defects on site using TunnelMap recording software on a tablet
- Material samples and tests
PHASE 3 – Assessment / Analysis
- Direct export of the recorded data to a database
- Full-coverage surface and clearance envelope analysis
- Customizable evaluations and statistical analysis
- Inspections of the structure (material tests, detailed structural safety analysis, etc.)
PHASE 4 – Recommendation of measures
- Determination of the structural condition
- Classification of the tunnel condition
- Suggestions for structural measures
- Presentation of solution options
- Time schedule and cost estimation
- Documentation by means of digital inspection data, CAD drawings and documents
- Recommendations for further investigation and monitoring
- Design and Planning for value conservation and remedial measures
- Comprehensive reporting
Competence
- Profound knowledge of the procedures, execution and evaluation involved in state assessments
- Interdisciplinary collaboration of experts from the fields involved
- In-house expertise in digital recording and analysis of data for state assessments (engineering, measurement technology and materials laboratory)
- Overall concept for standardized inspections
Benefits
- Safeguarding of structural safety and serviceability, thereby ensuring maximum availability
- Ensured operational safety
- Reduction of shutdown times
- Safeguarding of operational safety
- Expenditure optimization in logistics
- Appraisal as basis for planning, operation and maintenance of a structure
- Time savings and comparability of digitally captured data
- Complete validation documentation for operating permits from FOT, FEDRO and cantons
Selected references
Project
Lucerne city ring road, Lucerne, Switzerland
Services
Motorway tunnel
Client
FEDRO, Zofingen Office
Project
Charnadüra tunnel, Celerina, Switzerland
Services
Renovation of the 449 m long, single track railway tunnel
Client
Rhätische Bahn AG, Infrastructure
Project
Butzentunnel, Andermatt-Nätschen, Oberalp Pass, Switzerland
Services
- Butzen tunnel renovation
- Loop tunnel with rack track
Client
Matterhorn Gotthard Bahn Infrastruktur AG (MGB)
Project
Intra-urban, 2-tube road tunnel, 2 and 3 lane, one tube with intermediate ceiling, Switzerland
Services
State assessment, review and recommendation of measures
Client
City of Zurich, Switzerland
Project
Main inspection of 30 Rhaetian Railways tunnels, Switzerland
Services
Survey of defects, damage and changes in the structure or immediate vicinity with the “TunnelMap” software
Client
Rhaetian Railways, Chur
Project
Central Railway tunnel inspections 9 tunnels with a total length of: 7,066 m, Switzerland
Services
Visual inspection, state assessment, scanning and clearance envelope analysis of masonry-wall and reinforced concrete tunnels
Client
zb Zentralbahn AG, Stansstad
Frequently Asked Questions
Much of the world's tunnel and infrastructure stock is ageing, and renewal is a major focus. We assess the condition of existing structures (laser scanning, high-resolution visual inspection, material testing, TunnelMap recording), analyse the data, classify the condition, and recommend remedial measures — with realistic, transparent cost estimates to support reliable budget planning.
Based on the assessment, we develop maintenance plans and refurbishment concepts and recommend future-proofing strategies that balance cost, availability and long-term performance — minimising shutdown times.
We provide lifecycle-oriented solutions for long-term operational performance: condition assessment, maintenance strategies, digital inventories and digital twins, asset management systems and decision-support tools. We help owners manage their infrastructure strategically throughout its entire lifecycle, supported by monitoring, data, and analytics.
