1. Interaction Region Alternative Layouts
J.Osborne CERN – 21 August 2007

2. RDR Baseline Layouts for Interaction Region
J.Osborne CERN – 21 August 2007

3. Why Single Shaft Alternative:
Cost savings for civil engineering (approx. $10million)
Can simultaneously perform lowering in shaft and normal work in Experimental Cavern
J.Osborne CERN – 21 August 2007

4. General view of Proposed One Shaft Option.
Secondary9 m shaft
Main service cavern machine & Exp B B
Main 18 m shaft A
Second service cavern Exp A
J.Osborne CERN – 21 August 2007

5. Main ventilation ducts
And services Exp A
18 m
Lift
Stair
80-t crane
Exp A & B
9 m
Lift
Stair
20-t crane
Machine
& Exp B
J.Osborne CERN – 21 August 2007

6. . Access 20-t loads Exp B Main service cavern machine & Exp B Access
Heavy Loads
80-t loads
Exp A & B
Pressurized
Egress tunnels
Second service cavern Exp A
J.Osborne CERN – 21 August 2007

7. Movements of Experiment A
1: to main unloading zone
2: to garage position and leave space for experiment B in unloading zone
3: beam/garage position
Exp B 1 2 3 A
J.Osborne CERN – 21 August 2007

8. Surface Area for One Shaft Option
2 80-ton cranes
19 m crane hook A
1 80-ton cranes 12 m crane hook
Trucks B
J.Osborne CERN – 21 August 2007

9. Disadvantages of single shaft Option :
Detector B is in a less favorable position
If Detector B needs ‘major’ repairs, neither detector could be on-line (eg magnet removal)
Lifts & staircase have to be included in experimental shaft
If delays incurred both TBM’s could arrive at experimental cavern at the same time, more flexibility with 2 shafts for finishing works/fitting out
J.Osborne CERN – 21 August 2007

10. Beam tunnel TBM’s extracted from Experimental Cavern
Service Tunnel TBM
TBM finished=4.5m
MS TBM =4.5m
Cavern finishing
Shaft/cavern excavation
TBM setup
TBM transport
TBM removal
Finishing work
Beam tunnel TBM’s extracted from Experimental Cavern
J.Osborne CERN – 21 August 2007

11. General view of Proposed Off-set Two Shaft Option
9m shaft for machine
Two shafts with lift/stairs services 80-t crane
General view of Proposed Off-set Two Shaft Option
J.Osborne CERN – 21 August 2007

12. Two side caverns have tendency to act as a single span – intermediate pillar may be needed in certain areas, depending on ground conditions
J.Osborne CERN – 21 August 2007

13. Surface area would be a variation of what has been looked at with less distance between the shafts
J.Osborne CERN – 21 August 2007

14. Is the RDR cavern width enough ?
RDR Baseline Layouts for Interaction Region
J.Osborne CERN – 21 August 2007

15. GLDc in beam position V1 20ton gantry crane
J.Osborne CERN – 21 August 2007