Dating tunnel info

The machine, designed by Herrenknecht of Germany, was 156 m long, 12 m in diameter and was delivered to Dublin port in 105 parts carried by three ships, taking one week to unload.Combined, these bores resulted in the removal of 500,000 m³ of rock.

dating tunnel info-71

It eventually opened in December 2006, giving an elapsed time of 66 months.

One reason for the project extension was to allay residents' noise concerns.

Nishimatsu constructed a pipe-jacked supporting structure for the railway 3.5 m below the surface.

The tunnel was then constructed in the supported space using horse-shoe sections and backfilled.

Longer distance buses from Belfast, Derry and Letterkenny also use the route.

The tunnel was first suggested in the 1990s after a number of transportation and engineering studies and was included in the Dublin City Development Plan 1999 – 2005.

Much of the bored sections are 21–23 m below the surface, with the lowest point at Marino, towards the southern end, a point that also hosts the tunnel's drainage sump.

A particular challenge was faced near the southern portals where the tunnel passes under the Dublin to Belfast railway, a line that also carries suburban and commuter services.

To discourage commuters from using the tunnel, vehicles other than HGVs are heavily tolled.

HGVs travelling north and west benefit from the expected six-minute journey time through the tunnel.

The project was approved following a public inquiry in 1999.

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