On-Site Tunnel Scanning

Dovrebanen, Norway

Project Related Data

Project executed2006 - 2008
Tunnel length3 x 0,6 km
Highway tunnel
Railway tunnel
2x double track
1x double track
Servicecomprehensive tunnel scanner survey
construction survey
network measurement
Hardwarelaser scanner 4200-MRF
Client/OwnerBeMo Tunnelling GmbH, Bernhard-Höfel-Str. 11, A-6020 Innsbruck
Statens Vegvesen, Postboks 8142 Dep, N-0033 Oslo
Jernbaneverket, Postboks 4350, N-2308 Hamar

Project Description

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.

Tunnel Götschka - Austria

Project Related Data

Project executed11/2011 - 07/2016
Tunnel lengthapprox. 4.400 m
Highway tunneltwo and three-tracks with
tunnel enlargements
and cross cuts
Servicegeodetic disformation measurements
localisation of water ingresses
tunnel scanner comprehensive documentation
drift as well as sealing and tunnel lining
Bau Management GmbH
Modecenterstraße 16
1030 Vienna, AUSTRIA

Project Description

Tunnel Götschka is 4,4 km long and part of the S 10 Mühlviertel highway new construction, which is a transport infrastructure project of regional, national as well as international importance. The tunnel leads south to north and is constructed as a gradient tunnel due to topographical reasons. Its one tube is planned three-lane, while the western tube is built two-lane.
Surveying services include geotechnical measurements with tunnel scanner recordings, as well as the localisation of major water ingresses in accordance with the water law decision for the tunnel project. Geodetic deformation measurements above ground are directly carried out on the slope stabilisation and the surrounding terrain. Additional vertical inclinometer are set and anchor load measurings are executed at selected pretensioned anchors. Inclinometer measurements above ground are carried out as a supplement to the advance measurements under ground.
Tunnel driving is implemented as cyclic drift, according to the blast method of the new austrian tunnelling method (NÖT). Geotechnical measurements under ground are carried out as geodetic deformation measurements and also by the means of measuring anchors and anchor load measurings. A comprehensive documentation of each of the four tunnel drives, including tunnel enlargements and cross cuts are executed with the tunnel scanner. Another comprehensive documentation of the tunnel sealing and the tunnel lining has to be accomplished after finishing the drifts in the main tubes.
Furthermore specific measuring instruments as hydraulical pressure sensors, extension sensors and sliding micrometer are provided and installed.

Surveying services are implemented for following sections:

  • main tubes driving works, including tunnel enlargements, cross cuts etc. during continuous operation
  • geotechnical recordings of the portal excavations north and south
  • mass recording of the tunnel sealing and the tunnel lining in the main tubes and cross cuts

The project is executed as ARGE Pyöry Infra GmbH / Dibit Messtechnik GmbH.

Roppener Tunnel - Austria

Project related data

Project executed2006 - 2008
Tunnel lengthapprox. 5.100 m
Highway tunneldouble track with cross cuts to the 1st tube
Servicesgeotechnical measurements, comprehensive tunnel scanner survey, network measurements, construction survey
AdvanceNATM / cyclical drive
Client/OwnerASFINAG Baumanagement GMBH, A-1011 Vienna


Devil's Slide Tunnel, Pacifica, Californien

Project Related Data

Project executed10/2007
Pedestrian tunnel2 twin tubes
Tunnel length
Scanned area
approx. 2.400 m
approx. 14.400 m²
Servicegeotechnical measurements
comprehensive tunnel scanner survey
construction survey
Client/OwnerKiewit Pacific Co.
930 Oddstad Blvd
Pacifica, 94044 CA

Project Description

The Devil's Slide Tunnel project consists of two twin bores approximately 1,200 meters each along the famed Highway 1 outside of San Francisco, California. The tunnels are being constructed by Kiewit for the California Department of Transportation. The tunnels are bypassing a historically difficult stretch of road due to a massive landslide, appropriately named "Devil's Slide."
The scanning data obtained through the dibit scanning system is used for several different purposes including maintaining excavation profile, ensuring that the shotcrete does not encroach on the final lining, verifying shotcrete thickness, and determining shotcrete smoothness for waterproofing.
The dibit tunnel scanning system at Devil's Slide consists of a "Pulsed Method" laser scanner with a point resolution of 5mm and a digital camera mounted to the scanner as seen. The system is controlled using a field notebook computer, which communicates with the scanner, digital camera, and theodolite mounted on the wall of the tunnel. Communication with the field computer and theodolite is accomplished through a wireless connection.  As seen in the scanner is mounted on an all terrain vehicle (ATV) for ease of transportation.

Washington Dulles International Airport, West APM Tunnel, VA - USA

Project Related Data

Project executed02/2006 - 03/2006
"Automated People Mover" -
Passenger tunnel
4 tubes / NATM
Tunnel length
Scanned area
approx. 635 m
approx. 12.000 m²
Serviceas-built documentation of shotcrete lining and
comparison with theoretical profile
Client/OwnerClark / Shea JV
7500 Old Georgetown Road, Bethesda, 20814, Maryland/Metropolitan Washington
Airports Authority, VA

Project Description

To keep pace with the growth in air service and traveling demands of the Washington Dulles airport the Dulles Development program for a new passenger transportation system was approved. Key project was a new Automated People Mover (APM) system comparable to urban rapid transit systems, which will take passengers between the Main Terminal and the midfield Concourses in a tunnel system free from all traffic. For the NATM method of construction, the tunnel was mined utilizing more conventional excavation equipment that dug through the tunnel face in one to two meter (3 to 5 ft) ‘bites’. Shotcrete was immediately applied to the exposed tunnel walls to provide support.
The survey with the dibit Tunnelscanner system was conducted  prior to the installation of the PVC waterproofing membrane to provide a comprehensive as-built documentation of the initial shotcrete lining.

The as-built tunnel scan data was used to:

  • Verify the tunnel geometry with a point cloud grid of up to 10x10 mm (0,4x0,4 inch)
  • Show the excavated (actual) dimensions, including deviations from the design (theoretical)
  • Check the shotcrete smoothness for the installation of the waterproofing system
  • Show the thickness of the CIP concrete lining and volume quantities of the CIP lining

dibit deliverables included the full color georeferenced 3D model of the tunnel with high resolution orthopictures, cross sections of actual tunnel lining dimensions, point cloud and lining thickness and quantity reports.


Lötschberg Base Tunnel - Project II, Switzerland

Project Related Data

Project executed2004  - 2006
Tunnel length
Scanned area
approx. 49.600 m
approx. 1.500.000 m²
Client/OwnerBLS AlpTransit AG
Aarestraße 38B
CH-3601 Thun

Project Description

The 35 km long Lötschberg Base Tunnel is the heart of the Lötschberg rail line. Within the ALP Transit project, dibit logged the components geometry and the surface of the tunnel for final lining acceptance and examined compliance with the target values.
A comprehensive survey of the complete final lining (vault, shoulder, floor) was accomplished with the dibit tunnel scanner and data was processed  according to  the quality criteria defined by the client. The resulting data is in a point grid of 1 x 1cm while the radial resolution amounted to 1mm. The surface of the vault was also recorded with high resolution cameras so deviations from the normal state (e.g. cracks) can be easily visually recognized. Results of the component check were handed over in the form of a data base.

This project was carried out in joint venture.

Lötschberg Base Tunnel - Project I, Switzerland

Project Related Data

Project executed2001 - 2005
Tunnel length
Scanned area
approx. 35.000 m
approx. 1.200.000 m²
Client/OwnerBLS AlpTransit AG
Aarestraße 38B
CH-3601 Thun

Project Description

The 35 km long Lötschberg Base Tunnel is the heart of the Lötschberg rail line. The client BLS AlpTransit expected 100 years lifetime of the construction.  Therefore highest quality demands were made to the tunnel sealing.

In numerous tests the client had identified the influences which were significantly responsible for the impairment of the tunnel sealing. A crucial criteria was the undulations in the shotcrete layer. Therefore BLS AlpTransit assigned dibit to implement a comprehensive tunnel survey of the entire shotcrete lining so it could be strictly evaluated before construction of the new tunnel sealing would begin.

This project was carried out in joint venture.

Mission Valley SDSU Tunnel - USA

Project Related Data

Project executed11/2002-12/2003
Light Railtunnel1 tube, double track
Tunnel length
Scanned area
5 x approx. 350 m
approx. 43.000 m²
Serviceas-built documentation of shotcrete lining,
smoothing layer, final lining
Client/OwnerWashington Group International, Inc.
7199 Alvardo Road
La Mesa, 91941 CA

Poject Description

San Diego State University (SDSU) is tied up until 2005 to a new rapid-transit railway system. In the course of this project a 350m long tunnel is constructed on the university campus. The tunnel is build according to the new Austrian tunneling method (NATM).

Before the installation of the final lining, which is made of shotcrete, the surface of the initial shotcrete lining has been surveyed with the dibit tunnel scanner system in order to detect all tights and to evaluate the actual profile of the lining. A further survey was ordered by the client to prove that all tights have been removed. This step revolved as some tights were detected after this survey again. After installation of the smoothing layer prior to the installation of the water membrane a profile check was executed. After installation of the final lining an as-built survey has been executed to confirm that the applied shotcrete meets the design specification regarding minimum and maximum thickness. The survey also provided the actual volume of the shotcrete for the final lining and profile of the final lining

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