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Strait Road Crossing: a new Bosporus Crossing for Istanbul

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Istanbul, the largest city in Turkey, is a huge metropolitan area with 14 million people. As a city that spans two continents, it is intersected by the Bosporus, the strait that connects the Mediterranean Sea with the Black Sea.


In addition to a ferry service, a big part of daily commuter traffic utilizes the few bridges that span the Bosporus. Istanbul and it’s population lives with daily traffic congestion. The Marmaray subway tunnel has already been built under the Bosporus. With the beginning of the Strait Road Crossing project a big part of the intercontinental car traffic is to be diverted under the sea.

The construction of the tunnel fits into the larger project of the modernizing of the Istanbul highway network. A consortium of Turkish and South Korean construction companies (Yapi Merkezi and SK Engineering) are responsible for the construction of the tunnel in a public-private partnership.

Using a 14 m diameter Herrenknecht tunnel boring machine will bore its way through the planned 3.35km long tunnel which, at time will lay up to 80m below the sea bed. Once complete the tunnel will be split level, providing one level for each direction of travel.

VMT system technology helps the project contractors to deliver the high quality standards and precision that comes along with this huge project:

In the segment production, which the Turkish firm Yapi Merkezi is responsible for, the VMT segment documentation system, SDS, helps the engineers in the supply management and quality management of all segments for the tunnel lining.

Instanbul_Tübbing

The VMT laser-controlled Tunis navigation system the tunnel boring machine can be guided with millimeter accuracy along the intended designed path. With accurate input of VMT GAPtrix system the TUnIS ring sequencing is supported in the calculation of rings to be constructed. The ring sequencing in connection to the aboveground installed SDS on the construction site supports the planning and logistics of transporting the needed ring segments to the tunnel.

Istanbul_Baustelle

The TUnIS ring planarity check which is connected to the ring sequencing controls every ring on compliance of necessary flatness to prevent spilling form point loads.
The continuous process control of the relevant TBM data is made possible via the ubiquitous web-based Risk and Information System, IRIS. IRIS allows the project management to get a detailed view of the progress of the project via the automated logging of data, allowing the improve performance the shift and machine connected to the planning of maintenance jobs.
This project be using the following VMT systems:

A comprehensive set of customised navigation and control systems from VMT are taking over key functions for the large diameter tunnelling project Waterview Connection in Auckland.

In New Zealand’s largest city a new motorway section is being constructed, the centrepiece being two parallel tunnels each with three lanes. The large-scale Waterview Connection project will close the gap between the Northwestern (SH16) and Southwestern (SH20) motorways, therefore completing Auckland’s much needed Western Ring Route.  This will provide a high-quality alternative to State Highway 1 for journeys through and within Auckland as well as a much needed direct motorway link between the Central Business District (CBD) and Auckland Airport. The centrepiece of the Waterview Connection is a twin-bore 2 x 2.43 km long tunnel. Since October 2013 a Herrenknecht EPB Tunnel Boring Machine (TBM) of 14.41m diameter has been utilised for tunnel excavation. During a celebration to open the tunnelling works, New Zealand’s Minister of Transport Gerry Brownlee said “The project is a significant investment by the Government in the strategic expansion of the motorway, which relieves Auckland’s population and supports the economy.”

VMT GmbH configured a comprehensive package with customized navigation and control systems for tunnel excavation in close cooperation with the project partners. The VMT systems monitor and regulate parameters and interfaces needed for tunnel construction, therefore supporting project management in process control and quality assurance.

VMT Auckland Waterview

The laser based navigation system TUnIS measures the position of the 14.4 metre TBM   in relation to the designed tunnel alignment to the nearest millimetre. TUnIS transmits the measured data to monitors for the TBM operator, responsible for precisely navigating the TBM underground. The TUnIS software also incorporates a ring sequencing module to assist in ring selection. Depending on elements such as alignment radius or location of cross passage construction, the ring sequencing module recommends which segment type to build. The ring sequence calculation takes into account the data delivered by VMT’s GAPtrix tailskin clearance measurement system.

VMT_Auckland_Waterview_SDS1

The precast plant in Auckland will produce a total of 24,000 tunnel lining segments, plus over 2,400 precast concrete culverts for installation at the tunnel invert. The production of segments including materials used, their storage across three yards and respective logistics are monitored, controlled and documented by the Segment Documentation System SDS from VMT.

VMT_Auckland_Waterview_SDS

The Integrated Risk and Information System IRIS provides an efficient tool for data management. IRIS collects and analyses all relevant tunnelling data and stores within a central database, to assist overall management of the construction site.

Project Partners

Scope of Supply by VMT GmbH

 

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