IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 1 20m The Initial Geodetic Survey for the SPIRAL2 Process Installation at GANIL Rémy Beunard A. Lefevre, F. Legruel GANIL, CAEN, FRANCE The 11th INTERNATIONAL WORKSHOP ON ACCELERATOR ALIGNMENT DESY, Germany, September 13-17, 2010
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IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 1 20m Rémy Beunard A. Lefevre, F. Legruel GANIL, CAEN, FRANCE The 11th INTERNATIONAL.
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IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 1
20m
The Initial Geodetic Survey for the SPIRAL2 Process Installation at GANIL
Rémy Beunard A. Lefevre, F. Legruel
GANIL, CAEN, FRANCE
The 11th INTERNATIONAL WORKSHOP ON ACCELERATOR ALIGNMENT DESY, Germany, September 13-17, 2010
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 2
Outline
Overview about SPIRAL2 project
The Geodetic Systems
Process installation principle
Monitoring of Building Movements
Summary
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 3
PARIS
CAEN
FRANCE
Geographical location
The SPIRAL 2 project is located at the GANIL *
facility in Caen in Basse-Normandie.
*GANIL: (Large National Heavy-Ion Accelerator)
GANIL
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 15
Surface geodetic network project
Type of geodetic pillar equipped with a forced centring
1
Pillar of the Linac and LHE line axes (included in the geodetic network)
Geodetic network pillar
6
7
8
2
9
5
4
3
10
Phase 2 radioactive
beam transport line
This geodetic network had two objectives:
to provide reference points to allow installation of the process at level -9.50 m,
to monitor movements of the building at level 0.
Pillar will be anchored on at the geologically highly stable bed and isolated from the future
infrastructures and their excavations.
These pillars will remain in position throughout the lifetime of the accelerator
How to install the process geographically ?
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 16
1
3
4
2
Surface geodetic network project
Reference pillar for process installation at – 9.50 m
Phase 2 radioactive beam
transport line
Network takes into account the land occupied by the worksite, earthworks area and final layout
Pillars must be installed after the earthworks and before starting the civil engineering work for the building
Surveying for surface network will be carried out by TDA tacheometer with GPS observations
Simulation remains to be done
Final accuracy expected : ± 3.0 mm ?
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 17
The first solution which occurred to us is to transfer the beam Linac axis by optical plummet through this survey shaft.
Installation the 2nd order geodetic network
Linac axis
Pillar N°1
Pillar N°2
shaft shaft
longitudinal section of the Linac
Lev. 0.0 m
Lev. -9.50 m
Filling up layer(calcareous stone extracted
during the excavation)
This solution was rejected because of the risk of neutron scattering at level 0 due to
the difficulty to press down the calcareous stone around the shaft
Transfer of aboveground coordinates into the tunnel via plumbing
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
The beam line axis will be
transferred onto the concrete
slab from pillars 1 to 2
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 18
talus
talus
Sketch
Block limit
ACC 1/2-2/2
Intersection
Linac / LHE
Pillar N° 1 Lev. + 1.43 m
Lev. 0.0 m
Slope
Slab
Lev -9.50 m
Slope
Lines of sight
Lines of sight
Markers sealed in the slab
Installation principle of the process (Linac)
axes at level – 9.50 m
Installation the 2nd order geodetic network
Pillar N° 2 Lev. + 1.43 m
Linac axis
Constraint of this solution :
This operation must be performed before the concrete slabs of the higher levels are poured (ceiling of Linac and beam transport rooms)
reference marks will be sealed in the slab at predefined positions,
their Cartesian coordinates will be determined using the geodetic pillars of the first order network.
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 19
Installation the 2nd order geodetic network
Partial view of the topometric network of the
process at -9.50mInstallation of a floor grid reference
spaced between 3 and 5 m.
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
Network measurements with TDA 5005 coupled with Laser Tracker LTD 500 and digital Level Leica NA3003
Standard deviation of a point expected 0.1 mm
Reference marks sealed in the slab
Reference marks sealed againts the walls
(study is ongoing)
Viewing window installed during the making of concrete walls
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 20
Altimetric systems (m)
GANIL "local"NGF
(topographic plan)Contactor
(building plans)
GANIL
Accelerator floor +18.50 + 58.47 0.00
Experimental area floor + 18.25 + 58.22 -0.25
ACC Beam Median Plane lev 0 + 20.00 + 59.97 +1.50
ACC Beam Median Plane lev -1 + 16.75 + 56.72 -1.75
SPIRAL2
Floor lev +0.00 (ground level) +18.50 + 58.47 0.00
SPIRAL2 Beam Median Plane + 10.50 + 50.47 -8.00
Floor lev -9.50 (Linac) + 9.00 + 48.97 -9.50
Mapping between the various alltimetric systems used
Systems which will be used on the site depending on requirements
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 21
Monitoring of building movements at ground level
Lines of sight to monitor the building
Block ACC 1/2
Block ACC2/2
Block S3
Block NFS/LHE
Movements will mainly be monitored during the first five years,
Quantify the movements of each building “block”,
Measurement will be taken by polar sighting using tacheometers from pillars.
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 22
Summary
Final goal : to guarantee the future connection of the new accelerator,
The connection requires designing a “surface” network linked to the local survey,
The local system was “connected” to the national system : to express in both systems the process and construction plans requirements,
The first order network geodetic pillars will be surveyed by tacheometer TDA 5005 coupled to a differential GPS,
The surface network will be transferred to the floor accelerator tunnel, in order to define the reference network for aligning all functional components.
See poster: « Survey and Alignment Concept for the SPIRAL2 Accelerator »
OVERVIEW SPIRAL2 GEODETIC SYSTEMS INSTALLATION PROCESS BUILDING MOVEMENTS SUMMARY
IWAA2010 - R. BEUNARD – September 13-17, 2010 – DESY, Hamburg, Germany 23