1. Tunnel Cross Section Studies
CES 8 July 2009
Tunnel Cross Section Studies

2. 4.5m tunnel used as baseline for 2007 costing exercise

3. What has changed since 2007 :
3d studies with CATIA integrating services
Cooling and Ventilation studies
Transport studies
Machine developments….

4. CTC 19 May Proposal : 5.6m tunnel
2270mm

5. Further to CTC of 19 May :
Drain reintroduced into tunnel invert to collect any water ingress from surrounding rock
3 ‘missing’ cable trays re-introduced
Machine height for installation reduced to 2100mm (from 2270 = -170mm)
Transport studies advanced with new machine details
Local tunnel enlargements proposed where turnaround re-enters the main Linac
Transversal ventilation has been retained for this study, pending CTC decision

6. Option B selected for this study

7. 4.5m tunnel
Machine height reduced, but still a conflict

8. Catia Studies Could re-position the tunnel enlargement to where
the turnaround re-enters the Main Linac
Catia Studies

9. 4.5m tunnel
Tunnel enlarged at Turnarounds

10. 4.5m tunnel
Move transfer lines to side of tunnel ?

11. BACK-UP slides

12. Five machine beams in this cross section
Catia Studies

13. Extract from CLIC Technical Committee :
G. Riddone, D. Schulte,

14. To dump
Drive beam

15. Beginning
Of turnaround loop
End
of turnaround loop
Main beam

16. Transport Studies

17. 4.5m tunnel Turnaround & transport Studies RIGHT VIEW
Main beam
Drive beam
2 CV pipes 250mm
Turnaround loop
Monorail
3 cable trays 520mm
2 CV pipes 600mm
Turnaround & transport Studies
Safe passage
Drive beam
Transport train
RIGHT VIEW
TYPICAL CROSS SECTION CLIC TUNNEL
Main beam

18. Possible Ventilation Systems for road tunnels
Extracted courtesy of ‘French Tunnelling Association : AFTES : Tunnels routiers : resistance au feu Jan 2008’

19. CLIC Ventilation Concepts Advantages of transversal ventilation :
Safety (see CLIC note from F.Corsanego EDMS )
Much better control of temperature & humidity gradient along the tunnel
CLIC

20. 6.0m diameter needed to accommodate 3m2 ducts !

21. TYPICAL CROSS SECTION CLIC TUNNEL – CV 2x1m2
Main beam
Drive beam
Extraction 1m2
Air supply 1m2
3 cable trays 520mm
Monorail
Transport train
CV pipes 600 & 700mm
Circuit A
Safe passage
CV pipes 250 & 700mm
Circuit B
Drive beam
Main beam
RIGHT VIEW
TYPICAL CROSS SECTION CLIC TUNNEL – CV 2x1m2

22. CLIC WORKSHOP - Ventilation
Tunnel section
SUPPLY DUCT
EXTRACTION DUCT
Circuit C : Fire Fighting
Circuit B : general cooling
Circuit D : compressed air
Circuit A : Module cooling

23. CLIC WORKSHOP - Ventilation
Safety considerations
Extraction
Air supply
Extraction
Air supply
SHAFT
POINT
Control of the pressure from both ends of a sector.
Control of the pressure (overpressure or underpressure in each area).
Fire detection per sector compatible to fire fighting via water mist.

24. CLIC Cooling Study
Proposed 1.5m diameter micro-tunnel for Cooling Pipes :
Approx. cost for CE works 250MCHF
Intermediate caverns would be needed for construction of micro tunnel
Integration for cooling pipes is complicated
Major impact on civil planning (excavated spoil through ‘completed’ structures)
J.Osborne

25. Herrenknect Visit June 2008
Herrenknect are one of the worlds biggest TBM manufacturers.
They advised that the most common diameter for TBM’s (metro etc) is 5.6 finished internal diameter.

26. 4.5m compared to 6.0m diameter
Cross Section Studies
4.5m compared to 6.0m diameter

28. Drive beam from Turnarounds missing from this cross section !
4.5m tunnel
Drive beam from Turnarounds missing from this cross section !

29. Drive beam from Turnarounds missing from this cross section !
5.0m tunnel
Drive beam from Turnarounds missing from this cross section !

30. 5.6m tunnel

31. Summary
With a 4.5m diameter tunnel, it appears difficult to accommodate all equipment
5.6m recommended by CES working group
More TBM’s of this diameter available will help with Project planning
Reduction in other costs due to more additional working space ? Space for future requests….
Additional CE cost in the region of 150M CHF
Barcelona Metro under construction 6.6m machine external, inner 5.8m. With 0.1m tolerance on radius = 5.6m internal diameter.