![]() A computer on the drilling jumbo captured the laser beams and positioned the drilling equipment automatically, according to a set pattern. ![]() Inside the tunnel, bearings were indicated using laser beams. Navigation satellites were used to determine fixed survey points on which other measurements inside the tunnel were based. To make sure that the tunnel sections met more than 10km into the rock and 1000 metres under the mountain, it was important that the drilling and blasting work were carried out with great precision. Operations during the construction of Laerdal tunnel was divided into four main phases: drilling, blasting, loading and transport and excavating and landscaping.ĭrilling the tunnel was carried out using computer-controlled drilling jumbos as well as traditional drilling and blasting. From an environmental perspective, the tunnel was seen as a justifiable investment to avoid destroying sections of the unspoiled natural landscape. The decision to build a tunnel rather than refurbish existing roads was taken to avoid difficult terrain with high risks of rock falls. The Laerdal tunnel is an important part of the extension of a ferry-free, reliable road link between the two largest cities in Norway. ![]() The construction was approved to traverse a section of the country with relatively poor levels of reliability in road transport due to the mountainous area and narrow roads combined with many fjord crossings. The 24.5km-long stretch of tunnel stretches between Aurland and Laerdal on the new main highway connecting Oslo and Bergen. In June 1992, the Norwegian Parliament decided to construct the world’s longest road tunnel. The tunnel is the longest road tunnel in the world. The 24.5km-long tunnel links Aurland and Laerdal.
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