In mining and tunneling, excavation and security alternate continuously. With a new method, the progress and quality of the tunneling can be captured in 3D and automatically evaluated. The method compares before and after scans and detects the changed parts accurately.
When rocks are removed from the tunnel face, the forming cavities must be secured. The surface can be protected, for instance, by the application of shotcrete (known as New Austrian Tunneling Method). Depending on the layer thickness applied, the shotcrete protection is classified as poor, sufficient or too strong.
A new method for determining layer thickness allows an epoch-wise control of the concrete layer and thus leads to higher reliability and greater efficiency. Using a customary 3D laser scanner and the efficient methods of Fraunhofer IOSB, the laser scans taken at different moments of time can be easily compared.
The method is simple and fast, because
The automatic comparison of before and after scans