A&K Geotechnical Engineering --> project sheets --> Ring Eoad of the Porte habitat
Project:
RING ROAD OF THE PORTE HABITAT - STATE ROAD 23 "DEL SESTRIERE" - TURINA TUNNEL
Owner:
Agenzia Torino 2006 (organization responsible for the construction of the Winter Olympic Games infrastructure)
Client:
Baldassini e Tognozzi Costruzioni Generali
Project description:
The 5km-long ring road will permit the heavy and winter tourists traffic that currently passes through the Porte village to bypass it. The new alignment crosses twice the Chisone river and develops on the right bank side of the valley. The main structures of the Project are four viaducts and two tunnels.
Geologic context:
The Turina tunnel will be excavated through gneissic rock mass and alluvial deposits consisting of sandy and silty gravel. Discontinuous water bearing soil levels are also expected to be encountered during excavation.
Location:
Porte - Italy
Start/end date:
8-2003/8-2005
Cost estimate:
€ 45.000.000
Design and consultancy services:
Alternative excavation method for the Turina Tunnel: tthe Owner's call for tender required an alternative design for the excavation method of the 600m-long Turina tunnel, aiming at construction time reduction. The proposed design was defined by full-face excavation with systematic face and tunnel perimeter ground treatment consisting of jet-grouting columns. Invert closure is foreseen in the vicinity of the front using a temporary bridge structure that enables the excavation to proceed without interruption. Self-drilling bolts, hinge-joint steel sets and the employment of a high speed boomer device for the installation of the pipe umbrella were also proposed as a means to accelerate construction.
The technical proposal obtained the highest rating (amongst 9 bidders) by the Owner's committee and permitted the Contractor to offer a significant price and construction time reduction, resulting in the award of the contract.
Period:
2003
In collaboration with:
SEA Consulting Srl
