john osborne : gs-sem civil engineering 19 may 2009 report on behalf of clic civil engineering and...

John Osborne : GS-SEM Civil Engineering19 May 2009

Report on behalf of CLIC Civil Engineering and Services (CES) WG

CTC 19 May 2009

Tunnel Cross Section Studies


4.5m tunnel used as baseline for 2007 costing exercise


• Tunnel Cross Section

– Original 4.5m internal diameter tunnel was developed by C.Wyss study in 2007 :

CLIC-Tech-Note-003

20 August 2007


• The tunnel diameter were initially dimensioned for the following items :– The CLIC machine, with their drive and main beam

machine components.– The 2.4 GeV and 9 GeV transfer lines for the drive

and main beams, respectively– An Installation corridor for the transportation of

machine modules for installing and/or replacement.


• Machine Services (1) :– Supply and return manifolds for demineralised water

cooling.– Raw water supply and return.– Drainage pipe embedded in concrete invert for any

water seepage– Compressed air for PETS on/off mechanism– Nitrogen distribution, if any– One or two 40mm duct(s) for optical fibre links– Two or three 500mm wide cable trays for dc power

cables.


• Machine Services (2) :– A free section of at least 70cm width by 200cm

for personnel passage between a module and the tunnel wall.

– One 500mm wide cable tray for low power and signal cables for the RF system

– One 500mm wide cable tray for beam instrumentation, survey and vacuum systems

– One 300mm wide cable tray for the power cables of the transfer lines


• Machine Services (3) :– One 200mm wide cable tray for the cables of the

vacuum and beam instrumention systems of the transfer lines

– The Low-Voltage (400V) distribution– 5 Cables for Medium Voltage (36KV). These cables

will bring power from Prevessin Site central Area to other sites

– Secure Low Voltage Electricity– Power for the transport vehicles– No mono-rail type transport included for the

moment


• Tunnel Services :

– Normal Lighting

– Leaky feeder for mobile telephones

– Public address system


• Safety Systems :– Panels with emergency lighting, emergency

stops, red telephones– Evacuation push-buttons (break glass type)

and sirens– Emergency radio communication for fire

brigade– Radiation monitors– Oxygen deficiency monitors?


• Alignment and Tunnel tolerances

– Space has been recently allocated for alignment systems

– A radial allowance for construction tolerances has been included (10cm)


Drive beam from Turnarounds missing

from this cross section !


• What has changed since 2007 :

– 3d studies with CATIA integrating services– Cooling and Ventilation studies– Transport studies– Machine developments….


Five machine beams in this cross section

Catia Studies


Extract from CLIC Technical Committee :

G. Riddone, D. Schulte, 2008.007.14


Drive beam

To dump


Main beam

BeginningOf turnaround loop

Endof turnaround loop


Transport Studies


3 cable trays 520mm

2 CV pipes 600mm

2 CV pipes 250mm

Drive beam

Drive beam

Main beam

Main beam

Safe passage

Transport train

Turnaround loop

RIGHT VIEWTYPICAL CROSS SECTION CLIC TUNNEL

Monorail

Turnaround & transport Studies

4.5m tunnel


Possible Ventilation Systems for road tunnels

Extracted courtesy of ‘French Tunnelling Association : AFTES : Tunnels routiers : resistance au feu Jan 2008’


TREATED FRESH AIRSUPPLY

90 000 m3/harea=2,2 m2

EXTRACTEDAIR

EXTRACTEDAIR

INSTALLATIONCORRIDOR

TRANSFERTLINES

CLIC

EXTRACTION AIR SUPPLY

INSTALLATIONCORRIDOR

TRANSFERTLINES

R= 2.5

Ventilation Concepts Advantages of transversal ventilation :

•Safety (see CLIC note from F.Corsanego EDMS 827669)

•Much better control of temperature & humidity gradient along the tunnel


6.0m diameter needed to accommodate 3m2 ducts !


3 cable trays 520mm

CV pipes 250 & 700mmCircuit B

Drive beam

Drive beam

Main beam

Main beam

Safe passage

Transport train

RIGHT VIEWTYPICAL CROSS SECTION CLIC TUNNEL – CV 2x1m2

Monorail

CV pipes 600 & 700mmCircuit A

Extraction 1m2

Air supply 1m2


COOLING AND VENTILATION IN THE TUNNEL

J. Inigo-Golfin - C. MartelCERN TS/CV

Wednesday 15th October 2008

CLIC WORKSHOP - 2008


Tunnel section

Circuit D : compressed air

Circuit C : Fire Fighting

Circuit A : Module cooling

Circuit B : general cooling

EXTRACTION DUCTSUPPLY DUCT

CLIC WORKSHOP - Ventilation


Safety considerations

SHAFTPOINT

Extraction

Air supply

Extraction

Air supply

• 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.

CLIC WORKSHOP - Ventilation


CLIC Cooling StudyProposed 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


4.5m tunnelDrive beam from

Turnarounds missing from this cross

section !


5.0m tunnelDrive beam from

Turnarounds missing from this cross

section !


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.


4.5m compared to 6.0m diameter

Cross Section Studies


variation of tunnel diameter CLIC

7,000

8,000

9,000

10,000

11,000

12,000

13,000

14,000

15,000

3.5 4.0 4.5 5.0 5.5 6.0 6.5

diameter (m)

cost

s (€

/m)

shield-TBM in rock

without escape way


5.6m tunnel


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.

john osborne : gs-sem civil engineering 19 may 2009 report on behalf of clic civil engineering and...

Documents