Turkey to Build Mega-Tunnel under Bosporus

Turkey to Build Mega-Tunnel under Bosporus

The government announced a new mega project in order to find solution to Istanbul’s busy traffic, which is building a three-story, sub-sea tunnel including a metro line and dual motorway.

The new mega project in Istanbul, the “Three-level Big Istanbul Tunnel,” will be first three-level tunnel in the world and will consist of both the metro line and dual motorway. The fast metro line will enable 40-minute travel from İncirli to Söğütlüçeşme and a 14-minute journey by car from Hasdal crossroads to the Ümraniye Çamlık crossroad.

The tunnel will enable faster and cheaper transportation between the two sides of Istanbul. It will integrate nine different urban train systems with a fast metro track, which is used approximately by 6.5 million passengers on a daily basis. It will also enable easier and faster connections to ring roads; thus connecting all main arterial roads.

Self drilling rock bolt has been successfully used in the pre-support of tunnel to take place of conventional bolting method. The traditional pipe tubing is a kind of steel bar and full of grouted boreholes around its full length, in addition, the common steel bar should be cased and grouted in advance in order to shrink the operation cycle. While self drilling rock bolt features drilling, grouting and anchoring for simultaneous construction. The technology is simple, reliable, efficient and cost-effective.

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