Turkey has revealed plans to build a three-level tunnel to cross underneath the Bosphorus. The $3.5 billion “mega project” is designed to ease Istanbul’s chronic traffic problem, which will connect the city’s two sides with one railway and two highways, is expected to cut travel times to 14 minutes.
The mega-tunnel which will be connected to the existing underground railway system and road networks, forms part of a build-operate-transfer system.
The 6.5 kilometre tunnel will run from Küçüksu on the Anatolian side to Gayrettepe on the European side, linking the two sides of the Bosporus at 110 meters below sea level. Davutoğlu said the tunnel will significantly reduce the transportation time between various centres of İstanbul.
Self drilling bolt(Pernos autoperforantes
), an ideal anchor system for underground construction, is an environmental solution for tunneling projects. In tunnel construction, the main function of self drilling bolt is to reinforce rock mass, improve the stability of surrounding rock, give full play to rock self-supporting ability and control the deformation and rock collapse of surrounding rock. Self drilling bolt has the advantage of integrating drilling, grouting and anchoring in a single operation. Compared with the traditional support, self drilling bolt has been widely applied in the world tunnel construction not only because it’s notable features, but also the technical and economical benefits.