Advanced software then processes the acquired video and orientation data to generate scaled and oriented 3D images of the tunnel face. These high-quality 3D representations allow engineers to perform comprehensive rock mass characterization, including geometric measurements, geological mapping, and overbreak quantification.
Overbreak quantification is a fundamental information when it comes to the assessment of cutter wear which connects ShapeMetriX TBM directly to excavation costs.
Seamless Operation and Practical Site Requirements
The ShapeMetriX TBM system is designed with operational simplicity and site constraints in mind. Standard installation uses 600 mm diameter openings on the TBM shield, allowing the imaging unit to be securely clamped and operated autonomously. However, alternative mounting solutions are available, and the system can be adapted for other opening geometries or custom requirements, ensuring compatibility with a wide range of TBM configurations. Data acquisition is efficiently carried out during TBM maintenance shifts, minimizing project disruption.
The autonomous TBM ImagingSystem consists of a rugged, waterproof casing that houses a high-performance action camera, an integrated smartphone (which controls the camera and manages data acquisition), and an array of LED video lights carefully arranged to ensure optimal illumination of the tunnel face, even in demanding underground conditions.
The fully self-contained ImagingUnit operates independently, requiring no external power sources or cabling. Each installation captures digital imagery of an annular segment of the tunnel face visible through an inspection opening — providing reliable and objective documentation within the available maintenance window, though a single scan cannot image the entire face at once.
User-friendly Image Acquisition and Data Management
ShapeMetriX TBM features an intuitive Android app that guides operators through the entire imaging process — from system activation and camera preview to video recording and wireless data transfer. After recording a 370-degree cutter head rotation, video data is wirelessly transferred to the smartphone, then easily exported to computers for further 3D image construction and analysis.
The software allows robust geotechnical documentation and facilitates ongoing project assessment, enabling operators to make informed decisions about TBM advance strategies and ground support design.
Proven Performance and Trusted by Industry Leaders
ShapeMetriX TBM has been successfully deployed on major tunnelling projects across Europe, including Follo Line in Norway, Koralm and Semmering base tunnel in Austria, or Bözberg in Switzerland. Current projects include Snowy Hydro, Australia, and Lesotho Highlands Water Project. These references underscore the system’s reliability and effectiveness in documenting tunnel faces within hard rock environments.
Safety and Maintenance
The ShapeMetriX TBM system is designed for safe operation with clear safety guidelines. The watertight units prevent water ingress, and the LED lights are designed for safe, reliable operation. Maintenance procedures for mounting unit replacement and system calibration ensure flexibility and longevity of the imaging system.
Conclusion
ShapeMetriX TBM by 3GSM GmbH is a cutting-edge solution that transforms the tunnel face documentation process for hard rock TBM projects. By combining autonomous digital imaging, robust orientation measurement, and advanced 3D image generation, the system empowers project teams to achieve superior geological characterization, optimize tunnelling operations, and enhance safety — all within the challenging constraints of tunnel construction.
