The hydro power plant Opponitz is undergoing renovation work which includes the rehabilitation of the existing, 2600 m long Opponitz penstock tunnel between Haselreith and the surge chamber in Opponitz. The main rehabilitation measure consists of a GFK Inliner, which will be placed directly onto the existing tunnel lining. To verify the tunnel dimensions for the GFK Inliner, a tunnel scanner survey was performed beforehand. The results provided the necessary information for dimensioning the rehabilitation measures.
All tunnel survey work had to be done within a very limited time frame to ensure that the tunnel could be re-flooded on time. Further time restrictions caused the fact that surveying work had to be coordinated with a structural inspection, which was performed at the same time.
Dibit Messtechnik GmbH services included to install a reference system in the tunnel. Therefore a traverse was measured through the tunnel with control points which were installed in increments of 50 m. All of the points coordinates were determined and tied together to form the reference system. Once the control points were in place, the tunnel scanning survey was carried out to geometrical and optical acquire the entire tunnel vault, resulting in a comprehensive, true color textured 3D model of the Opponitz penstock. From the 3D model, ortho-photos, in-situ and condition plans incl. tunnel objects, defects and stations of the segment joints were generated. In addition, a static profile analysis was accomplished between the actual and the design profile. Furthermore, horizontal and vertical cross sections, as well as point clouds with color information have been submitted to the client.
Dovrebanen is a railway from Oslo to Trondheim in Norway. At the section Langset - Brohaug a new railway tunnel is constructed. Concurrently with this, the European route E6 is developed to a two double-track highway. Parallel to the railway tunnel the construction of two tunnel bores for the highway are accomplished. Each of the three bores are approximately 600 m long. Surveying works at Molykkja tunnel and the two Korslund tunnels are performed as a joint venture Alpine BeMo Tunnelling - Dibit Messtechnik GmbH.
Dibit deliveres a comprehensive construction phase survey of excavation, shotcrete, sealing layer and tunnel lining. For this construction project the tunnel scanner system dibit LSC 4200-MR, as well as the newly developed scanner system dibit FSC 5100-sF1, complete with hard- and software for scanning, performing, visualisation and instant data depiction are in use. The dibit LSC 4200MR - system is supplemented with a digital camera, with which it`s possible to generate textured 3D-models in true colors.
Together with our partner ANGERMEIER INGENIEURE GmbH, we are implementing the framework contract for digital recording, data processing and defect analysis of the tunnel infrastructure of DB Netz AG. Over the next four years, this will enable infrastructure operators to scan the tunnels of the entire DB rail network uniformly using our latest technology (a total of around 740 tunnels with a total length of approximately 600 km). The goal is to capture and evaluate all tunnel structures in their entirety. Using our expertise in 3D scanning of tunnels, we will capture high-resolution images and create a true-color 3D model that provides numerous details for evaluating the structural condition of all tunnels.
Among others, the Petersberg Tunnel has already been scanned, for which we were able to create high-resolution results and defect images. Built in 1874 and recently rehabilitated, the tunnel stretches over 350 meters along the Mosel line between Neef and Edinger-Eller in Rhineland-Palatinate in Germany. The double-track tunnel passes under the Petersberg mountain and is named after it.
Completed in 1988, the Schwarzenfelstunnel stretches over 2.1 kilometers in the Hessian municipality of Sinntal. The double-track tunnel is driven by railroads at 250 km/h. Pretty fast, as you can see in the picture. As part of the framework contract, our scope of services was the surveying of the tunnel. We digitally recorded the building and processed the resulting data into a true-color, high-resolution 3D model. These results can be used to create damage analyses.
The existing access and transport tunnel Lärchenwand/Schrahnbachtunnel, which leads to the powerhouse Limberg III, is to be scanned. Most of the tunnel is shotcrete surface. The scan will serve as the basis to perform a clearance and transportation analysis to ensure that large components will fit through the tunnel.
Reit tunnel:
The Reit tunnel is located on the A10 Tauern motorway and was built during the construction of the A10 in the 1970s. It consists of 2 tubes (401 and 430 m) with 2 lanes each. It is a standard vault cross-section with a clear height of 4.7 m. The tunnel underwent in-depth rehabilitation in 2020 and 2021 (electromechanical equipment, coating, raised shoulder, concrete pavement, etc.). Prior to the work, a tunnel scan was already carried out as a basis for planning.
The Flachau enclosure:
The Flachau enclosure is located on the A10 Tauern freeway and was built in the course of environmental relief measures in 2008 - 2010. It consists of two tubes (852 and 492 m), with galleries built as box sections before and after the vault cross-section on the Villach lane. The clear height is 4.7 m. No tunnel scans have been carried out yet.
The approximately 800m long inner shell is to be recorded in true color by means of high-resolution tunnel scans. The purpose of the tunnel scan is to inspect the concrete surface for cracks and other damaged areas, so absolute positional accuracy plays only a diminished role.
The full-area tunnel scanner recording of the zero measurement (initial inspection) of the A/B section was carried out in 2001. The first follow-up inspection was carried out 10 years later in 2011. In both measurements, all damaged and rehabilitated areas on the surface were recorded and digitally documented using Dibit software. The task of this bid is now to carry out and evaluate the second full-field follow-up measurement of the vault of the A/B section another 10 years later, in 2021. Based on the two previous images, all visual and geometric changes of the tunnel surface can be recorded.
Scanned tunnel:
The scope of services includes the as-built survey by means of tunnel scans for the tunnel tubes listed (both directional carriageways in each case), which serve as a planning basis for the repair of the objects. This involved georeferenced, area-wide 3D surveying and complete photographic documentation. The result represents a complete 3D model textured in true colors.
Scanned tunnel:
For ASFINAG Bau Management GmbH Bauliches Erhaltungsmanagement Süd (hereinafter referred to as BMG), the tunnel facilities listed were scanned in 2021 in high resolution and in true color. Subsequently, a 3D model was created as a basis for a subsequent tunnel inspection.
To improve the country's railroad system, 2TDK is building the second track of the Divača-Koper railroad. The new line runs from Divača down the karst plateau to the coastal area - just a few meters above sea level. The project includes 7 tunnels, 3 viaducts and a 27.1 km long track - for which dibit is providing tunnel surveying and scanning expertise.
The Schmitt Tunnel is the bypass tunnel of Zell am See and road tunnel of the Pinzgauer Straße (B 311) in the province of Salzburg. The tunnel has a length of 5,111 meters and runs west parallel to the north-south through-town of Zell am See. Completed in 1996, the tunnel is single-tube and has two lanes. In the period from 2023 to 2030, escape and rescue routes will be retrofitted in the Schmitt Tunnel and, in parallel, operational and safety measures (E&M refurbishment) will be upgraded. In order to be able to plan and coordinate this work efficiently, a tunnel scanner survey is to be carried out as a basis for planning and also serves to document the structural condition.
The aim of this project was to create a digital, high-resolution 3D model of the tunnels, textured in true color, to be used as a basis for the upcoming tunnel inspection and planning of rehabilitation work. Along the S16 Arlberg expressway, a total of 13.1km of tunnels were recorded at 80km/h using the Dibit high-speed system FSC6100-SRmF10.
In the course of the evaluations, the measurement data from the laser scanner and the high-performance cameras were combined and processed in the Dibit8 software to create a high-resolution, true-color 3D model of the entire tunnel surface including the carriageway (360°). The 3D model was located in the project coordinate system with reference to stationing and tunnel meters.
As in the course of the extension of the Sydney Metro subway network a tunnel boring machine crossed under the existing City Circle railroad tunnels, Dibit Messtechnik GmbH was commissioned to carry out a detailed recording of the six tunnels in each case before and after the undercrossing. The aim was to determine surface changes and deformations by means of recording 270° of the tunnel inner shell.
The evaluated high-resolution 3D models of the different measurement epochs were globally georeferenced and can be compared with pixel accuracy in the Dibit8 software. Changes in the tunnel surface (cracks, spalling) as well as changes in the tunnel geometry (deformations) can be detected.
The client was provided with both the textured 3D models in open file formats and a Dibit8 software license for further analysis.
Scanned tunnel:
The aim of this project was the creation of tunnel scans and the detailed measurement of the tunnel systems on the A10 Tauern Motorway to create a geometric basis in position, height and cross-section for further planning work. The scan of the altogether approx. 11 km long tunnel chain was carried out by means of dibit high speed scanners. After evaluation, the combination of laser scanner and industrial cameras delivered a high-resolution, true-color 3D model of all tunnels.
The Lower Catskill Aqueduct (LCA) reconstruction project included the evaluation, design, and construction of improvements needed to ensure the reliable operation of this critical infrastructure for another century. The inspection helped determine the extent of repairs and reconstruction needed and formed the basis for the design approach for the required improvements. The non-pressurized sections were inspected by direct staff observations and laser scanning of the non-irrigated sections (Segments 1, 2, 3, 4).
The goal of the Dibit metrology was to create a geometrically accurate, color, textured 3D model of all four segments of the tunnel lining and associated components referenced to the project's global coordinate system. This model was then used by engineers to digitally document (identify, classify, quantify, and geolocate) defects in the tunnel lining and/or associated components.
The goal of this project was to perform a virtual inspection of this highly frequented railroad tunnel in Seattle. The task was to drive through the double-tracked railroad tunnel using a kinematic scanning system and to inspect and survey the clearance and damage. The recording was carried out at about 5 km/h using the dibit tunnel scanner system, which consists of a hybrid system with laser scanner and high-resolution color cameras. On the basis of the 3D model, profiles were created and analyses carried out.
