Eurailmag - #15 - March 2007 - (Page 100)

Tunnels © BBT SE THE BRENNER CORRIDOR IS THE BUSIEST NORTH-SOUTH TRANS-ALPINE CROSSING • the “innovative approach” (tunnelling with TBM): in this case, mechanical tunnelling will be used, except for stretches where rocks are unstable • the “conservative approach” (traditional tunnelling): in this case traditional tunnelling is extended to stretches adjacent to unstable zones, to ensure seamless methods are used for the two side access points The “innovative approach” involves mainly Tunnel Boring Machines, plus mechanical tunnelling. During the first construction phase, the exploration tunnel will be built at the same time as the descending side accesses, in order to rapidly establish natural drainage, because of gravity toward the entrances of Innsbruck and Fortezza from all the countercurrent excavations. This will avoid forced pumping problems during major water flows when tunnelling, and will also enable selective water transport towards the entrances (drinking, industrial and thermal water). The “conservative approach” implies that in geologically difficult areas and where heavy water flows are predicted, the traditional tunnelling method will be used, and in geologically convenient stretches, TBM. If the conservative approach is used, unlike the innovative, no variations are applied to Issue 15 EURAILmag Business & Technology

Table of Contents for the Digital Edition of Eurailmag - #15 - March 2007

SOMMAIRE
NOTICE BOARD
COATINGS
NEWS
SERVICES
INFRASTRUCTURE
HIGH-SPEED LINES
TUNNELS
PEOPLE
ROLLING STOCK
WEBSITE DIRECTORY

Eurailmag - #15 - March 2007

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