Construction Survey

Hydropower Station Stanzertal, Austria

Project Related Data

Project executed4/2013 - current
Waterway lengthapprox. 5,4 km
Servicesnetwork measurements, construction survey, machine control, geotechnical measurements
Client/OwnerStanzertal GmbH
ARGE KW Stanzertal

Project Description

The hydroelectric project Stanzertal includes the construction of an access tunnel, an approximately 5.4 km long underground waterway with penstocks and intake tunnel, shaft and horizontal section, a surge chamber and the implementation of a pressure pipe for the inlet located at the entrance of the tunnel and a reinforced DN2400 concrete pipe crossing under the ÖBB train line as well as the Gondebachtunnel on the S-16 Arlberg expressway.

For this project extensive surveying from Dibit Messtechnik GmbH include:

Project preparation and tunnel network: GPS network measurement, stakeout of approach cut portals, tunnels, penstocks and horizontal section, daily network measurements.
Geotechnical measurements: implementation and evaluation of the 3D geodetic deformation measurements both above and below ground.
Conventional tunnel heading: advance control with dibit MLS, stakeout of all fixtures, niches and tunnel enlargements, profile control of outer shell
TBM: machine control with the system TAUROS.
Survey of Interior construction: stakeout concrete floor, all fixtures and profile control of inner shell.
Monitoring of the Gondebachtunnel: with the dibit AMS (Automatic Monitoring System). Storage, analysis and visualization of measurement data.
As built documentation Moltertobeltunnel: tunnel scanner recordings, geophones
Other survey work: Preparations for the installation of the vent pipe and the access tunnel portal structure  

Hydropower Station Nant de Drance - Shaft Construction, Switzerland

Project Related Data

Project executed5/2013 - current
Shaft depth2x app. 400 m
Servicescomprehensive tunnel scanner survey, construction survey
Client/OwnerARGE Schacht

Project Description

Dibit Messtechnik GmbH delivers a comprehensive profile check for the hydro power station Nant de Drance:

Within the construction of the hydro power station Nant de Drance in Switzerland, the sinking of two shafts with a depth of around 400 m are to be constructed. Construction works are divided in three sections, the pilot hole for raise-boring, raise-boring and the sinking of the shaft. Additional to the conventional method of optical shaft plumbing a comprehensive tunnel scanner recording of the excavation and shotcrete is performed. The 3D-model obtained enables further profile checks and the documentation of profile deviations.

Working steps of the tunnel scanner survey:

1: The local surveyor installs and measures fixed points at the shaft surface under the working platform twice a week. Each fixed point is then used as reference point for the tunnel scanner survey.

2: Recording of the excavation by the means of the dibit tunnel scanner LSC 4300-SRs requires the mining crew to position the recording system in the middle of the shaft and start the data acquisition with the laser scanner. For the recordings care is to be taken that the fixed points are clearly visible from the scanner system.

3: Transmission of data and results. Survey data is transmitted to Dibit Messtechnik GmbH head office in Innsbruck and is processed. Results are stored on a ftp server within 24 hours and are available for the client for further use.

Schulbergtunnel - Germany

Project Related Data

Project executed4/2011 - 12/2012
Total length1.400 m
Highway tunneltwin tube with two lanes each
Surveying Servicesfour contemporary drifts, geotechnical measurements, tunnel heading control, construction survey, tunnel scannning
Client/OwnerBeMo Tunnelling GmbH
Bernhard-Höfel-Str. 11
6020 Innsbruck, Austria

Project Description

Within the new construction of highway A44 from Kassel to Herleshausen, the Schulbergtunnel is part of the project. It is implemented as twin tube with two lanes per tube. The two tubes are connected with two cross cuts. To accomplish work, the mining construction method, as well as the top-down technique are applicable.
Surveying services include daily accomplishment, evaluation and depiction of the geotechnical deformation measurement during four contemporary drifts. The drift system is rebuilt constantly and the coordinates are updated. Therefor also the advance foremen are trained in the use of the system.
Within the scope of construction survey, profile checks in all construction phases are executed by use of theodolite and laserscanner. The complete stakeouts during the drift and the construction of the final lining are accomplished.
Network measurement include the construction and check of a sub-surface fixed point field, contemporary with the tunnel drift.

Roppen Tunnel - Österreich

Project Related Data

Project executed2006 - 2008
Tunnel lengthapp. 5.100 m
Highway tunneldouble track with cross cuts to the 1st tube
Advance methodNATM / cyclic drive
Servicesgeotechnical measurements, comprehensive tunnel scanner survey, network measurements, construction survey
Client / OwnerASFINAG
Baumanagement GMBH
Rotenturmstrasse 5-9
A 1011 Wien

Project Description

The upgrade of the Roppener tunnel with the addition of a second tube is part of ASFINAG’s tunnel expansion program to increase tunnel safety throughout Austria. In the course of this program highway tunnels with just one tube are to be extended with a second tube. Between the two tunnels cross cuts are to be established along with the refurbishment and additional recesses in existing tunnel tubes.
Geotechnical Measurement
The survey program of the geological measurements included geodetic deformation measurements above and below ground, as well as extensometer and inclinometer measurements. Geodetical monitoring measurements were accomplished for the lattice tower in the eastern section with loose rock along with the information buildings, access bridge to B171, traffic areas, roundabout and art piece at the interchange Pitztal and also the highway bridge before the western portal. Additional the existing portal buildings were permanently monitored by means of geodetical survey during construction works.
Tunnel Scanner Survey
The comprehensive tunnel scanner perfomance involved the allowance-related recording of the excavation, shotcrete, insulating layer and final lining. The results were delivered to the client within 24 hours.
Evidence of the First Tube and the Portal Building
A comprehensive documentation including 3D-model of the 1st tube was issued. Existing damages (cracks, spalls, water ingresses, etc.) were gathered and were mapped in a database-based tunnel information system. During construction work additional follow up surveys were accomplished in the portal areas.
Network Monitoring
The monitoring program for the survey network consisted of measuring the parallel tunnels fixed point and control network. During construction downtime (Easter, Christmas) checks where carried out on the control network and corrections made if necessary.
Construction Survey
Within the construction survey the complete stake out and inspection measurements were accomplished. These services were part of the collaboration with the contractor ARGE tunnel Roppen.

Katschbergtunnel - Austria

Project Related Data

Project executed2005 - 2007
Tunnel length5.400 m
Highway tunneldouble track with cross cuts to the 1st tube
Advance methodNATM / cyclical drift
Servicesconstruction survey, network measurements
Client / OwnerARGE
Beton- und Monierbau Jäger
Alte Bundesstraße 10
A 5071 Wals

Project Description

The upgrade of the Katschberg tunnel with the addition of a second tube is part of ASFINAG’s tunnel expansion program to increase tunnel safety throughout Austria. In the course of this program highway tunnels with just one tube are to be extended with a second tube. Between the two tunnels cross cuts are to be established.
Starting at the existing portal areas the tunnel crossed solid rock. Cross connections were to be constructed after the tunnel break through.
The advance measuring was carried out with a motor laser. Data for the BEVER system which controls the drilling rig were calculated and were loaded into the drill rigs database.
Cross connections were established with alignment laser or pendulum.
During construciton downtimes (Christmas and Easter) network measurements were carried out.
The stake out of the interior construction and the road construction was carried out within a narrow timeframe and in accordance with the client.

During the construction of the tunnel ceiling random checks concluded a concrete cover falling below the minimum concrete coverage in isolated areas.
A measuring program by use of a ferro scanner delivered a precise view of the actual concrete cover. The measuring program required one measurement reading per m² of the ceiling. The applied ferro scanner provided up to 50 measurement readings per m² because it permanently recorded the values in strips allowing significantly better picture of the actual condition to be delivered. The single survey strips were arranged with a distance of about 1 m and were recorded over the entire length. The recording was executed from a mobile work platform.
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