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How the tunnels connect to the road networkīoth citybound and westbound tunnel entrances and exits will be connected to the existing or new infrastructure. This is where TBMs Bella and Vida start and end their journeys. This involves excavating a trench then covering it with a concrete deck to form a roof. The start and end of each tunnel is being built using the ‘cut and cover’ method. These cross passages allow for the safe evacuation of tunnel users during emergencies. Tunnel safety featuresįor smooth and safe operations of the tunnels,emergency cross passages are built that connect between the two tunnels. Behind each TBM, crews then work to build the road surface and install electrics, ventilation and safety systems. While TBMs Bella and Vida are boring under the earth, the insides of the tunnel are being built, starting with the installation of the concrete lining – forming the walls, roof and base of the tunnel. What happens when the Tunnel Boring Machines finish?Īfter tunnel boring machines (TBMs) Bella and Vida finish digging, there’s still more work to be done to complete the twin tunnels before we can open them for use.
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