Un tunnel du métro de Lille, Ligne 2-Section B, 1994

S 17
Underground structures
Lille Metro tunnel
Line 2 - Section B
Map of the Metro, source: Line info May ‘93.
Client:
Lille Urban Community (CUDL).
Project manager:
Lille Urban Community (CUDL),
supported by Setec TPI.
Construction firms:
Group formed by the companies SGE
– FOUGEROLLES
Dates:
1991-1993.
Main characteristics:
Total length of the tunnel; 1,400 m.
Circular tunnel, 7.72m excavation diameter.
1 station.
4,000 m2 of diaphragm walls.
22,000m3 of earthworks.
8,000 m3 of B40 to B30 concrete.
5,000 m2 of waterproofing
Project cost: FRF220 million + VAT,
1994 value
“In view of the built environment and
the presence of several obstacles
along the route (where it is crossed by
SNCF lines and the urban clearway),
as well as numerous utility networks,
an underground solution was the only
option.”
Source: Travaux, September 1997
Section B of line 1(a) of the Lille Metro
was built as part of the project to extend
the line towards Roubaix and Tourcoing.
It comprises a 1.4 km tunnel with a station, an equipment shaft and two intermediate shafts.
SETEC TPI’s remit:
Since the end of 1989 Setec TPI personnel
have been providing CUDL (the Lille Urban
Community) with ongoing on-site support to
extend lines 1 (a) and 2.
On this particular section, SETEC TPI has
provided project management support:
•
in drawing up the detailed preliminary
study and subcontractor bidding document.
•
in monitoring the working designs.
•
in monitoring the working designs.
The tunnel, of external diameter 7.72m,
was bored beneath the water table with
the aid of a pressurised slurry tunnelling
machine with a ground coverage of 10
to 20 m.
The tunnel crosses chalk, upper and
lower sandy chalk layers and Louvil
clay seams.
The lining comprises 0.34m thick prefabricated reinforced concrete rings
joined with metal bolts.
Interior view of the station : source lignes-info March
Underground works in a highly urbanised site
setec tpi
Immeuble Central Seine
CS 71230
42/52, quai de la Rapée
75583 Paris cedex 12
tél.: 01.82.51.62.89
fax.: 01.82.51.41.82
internet : [email protected]
The underground works beneath the water table and in a dense
urban environment, led to the use of the same
pressurised slurry tunnelling machine that was
used at Lille and Toulouse.
Tunnel boring machine
October 1997