Bids under consideration by Istanbul Metropolitan Municipality for 2.5 km extension from Taksim to Yenikapi which will include bridge over the Golden Horn. Nov 1998.

Tender notice, deadline 25th December, 2007 for supply, installation and commissioning of electro-mechanical systems for the Kadiköy-Kartal metro (power supply and traction force, signalling, control and communication, ventilation, lighting, escalators and lifts, plumbing, drainage, installation of a traffic control centre, etc.). The Kadiköy-Kartal metro is a 21.7 km double-track underground line with 16 stations. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=247239-2007, OJ S 204, or contact Istanbul metropolitan Municipality, Istanbul, fax +90 2124494180. E-mail raylisistem@ibb.gov.tr 44/07.

A consortium of Italian construction company Astaldi and its Turkish partners Makyol and Gülermak is in the lead to get a EUR751.2 million contract from the Istanbul Metropolitan Municipality's transportation department to build a 21.7 km subway line between the Kadiköy and Kartal districts of Istanbul's Asian side. Astaldi, which is leading the group in the bidding for the contract, could get 42%, or EUR315.4 million, of the total value of the contract which also includes the E&M and signalling technology. Makyol has 41.33% and Gülermak has 16.77%. The Italian-Turkish consortium submitted the low bid against two rival consortia, namely Alarko-OHL (EUR753 million) and Dogu?-Yapi Merkezi-Yüksel-Siemens (EUR779.9 million). A previous tender for the project had been held two-and-a-half years ago but was cancelled, as the construction project was not feasible at the time. The line will be constructed underground but will go above ground wherever possible. The line will have 16 stops. Work is to begin in the second half of the year and last three years, once the contract signing process is concluded. The project will employ 2,000 people. Visit www.astaldi.com, www.makyol.com.tr and www.gulermak.com.tr 04/08.

Astaldi, as general contractor and leader of a joint venture with Makyol and Gülermak, and the municipality of Istanbul signed a EUR751 million contract for the construction of the new Kadiköy-Kartal line in Istanbul. The contract has been signed after the joint venture was named preferred bidder in January. Astaldi's share amounts to EUR315 million. The contract is for the construction of a new 20 km-long double-track underground line, with 16 underground stations, and includes also the supply of electromechanical equipment and the signalling system. The works are planned to start in the second half of 2008 and will be completed in three years. Visit www.astaldi.com, www.makyol.com.tr and www.gulermak.com.tr 11/08.

First US$117 million tranche of Japanese funding for the cross-Bosphorus rail link has been released to finance consultants to oversee design and tendering of the project and preliminary construction work. Japan's Overseas Economic Cooperation Fund (OECF) has already agreed to provide US$866 million for the US$1.6 billion project. The 13.3 km-long Bosphorus crossing will be combined with upgrading of the existing TCDD suburban lines to create a 76.3 km-long high-capacity railway across the Istanbul conurbation from Gebze to Halkali. The 1.8 km-long earthquake-proof immersed tube crossing will be assembled from 18 sections. It will be accessed by bored approaches from Yenikapi on the European side and Sogutlucesme on the Anatolian side. There will be intermediate stations at Sirkeci and Uskudar where the tunnel passes under the old city. Construction is expected to take around four years. December 1999.

Turkey's General Directorate of Railway, Port & Airport Construction has shortlisted three consortia for consultancy and engineering services. They are Pacific Consultancy of Japan with Parsons Brinckerhoff and Yuksel Project; Nippon Koei, Mott MacDonald, Louis Berger, Su Yapi Muhendislik, Nippon Civic and Sverdrup; and Prokon Muhendislik, Chiyoda, Akun, DE-Consult, Bung, TEC and Setec. The consultancy contract will be awarded with the aim of starting work early in 2001. Construction is expected to take around four years. The three consortia are to be vetted by Japan's Overseas Economic Cooperation Fund (OECF) before the final tenders are issued. Contact through www.mottmac.com April 2000.

Design contract for upgrade of 63 km of line with new 13.3 km-long marine link across Bosphorus from Gebze to Haliki and three underground stations awarded to PCI, Parsons Brinckerhoff and Yuksel. Tunnel will be bored from both sides, with 1.8 km-long immersed tube in central section at 58 m below sea level. Project value $1.2 billion, duration four years. Visit www.pbworld.com 44/01.

$2.5 billion engineering and consultancy agreement signed for the Marmaray project between the ministry of transport and the Avrasya consortium. The project involves the construction of a 13.3 km crossing over the Bosphorus and the upgrade of 63 km of suburban railway. $800 million to be spent for a 1.8 km earthquake-proof immersed tube, taking four years to build. 02/02.

Invitation to prequalify issued by the General Directorate of Railways, Harbours and Airports (DLH) for design and construction of the Istanbul Strait rail tube tunnel called 'Marmaray' and the Gebze-Halkali surface metro system after approval by the Japan Bank for International Cooperation (JBIC). The project includes a 2 km-long two-track immersed tunnel beneath the Bosphorus between the districts of Eminönü on the European side and Üsküdar on the Asian side of Istanbul, two-track approach tunnels on both sides of the immersed tunnel totalling 12 kilometres of combined bored tunnels, cut-and-cover tunnels and open cuts, and four deep underground stations. DLH is expected to collect bids for the tender in April 2003. Contact Mrs F. Simin Pehlivan, Ministry of Transportation, General Directorate of Railways, Harbours and Airports Construction (DLH), fax +90 312 2122874, E-mail simin@ubak.gov.tr. Visit www.ubak.gov.tr/tr/dlh/home/engmarmaray.htm 33/02.

The Japan Bank for International Cooperation (JBIC) has agreed to finance the Bosphorus strait tunnel crossing and 76.3 km-long Gebze-Haydarpasa and Sirkeci-Halkali suburb line paving the way to the tendering phase to be launched by DLH, the general directorate of railways, harbours and airports construction under the ministry of transportation. A 1.8 km immersed tunnel under the Bosphorus strait will be built to link the European and Asian sides and 12 km of connecting tunnels on both sides. The four prequalifiers are: Hazama / Penta Ocean / Yuksel Construction / Guris Construction; Kajima / Nishimatsu / Mitsubishi Heavy Industries / Enka / Dogus; Kumagai Gumi / Taisei / Gama / Nurol Construction; and Obayashi / Construction Center / Kiska / Metis. Estimated cost: €2.5 billion. Visit www.ubak.gov.tr/tr/dlh/index.html 05/03.

The four prequalifiers for the 1.8 km Marmaray tunnel across the Bosphorus strait and associated works, including 12 km of approach tunnels on both sides of the strait, are Kajima / Nishimatsu / Mitsubishi / Enka / Dogus; Hazama / Penta Ocean / Yuksel Guris; Taisei / Kumagai Gumi / Gauma / Nurol; and Obayashi / Construction Center / Kiska / Metis. Construction of the $2.5 billion Marmaray tunnel and the upgrading of existing rail links on both sides will begin in 2004 for completion in 2008. The tunnel will start in Yedikule, continue to Yenikapi and Sirkeci underground stations, cross the strait and be connected to another underground station at Üsküdar. After that point, the line will run above ground in Sogutlucesme. In total, the railway, including the tunnel, will be 13.5 km. Tenders for the project will open in October with work expected to begin in mid-2004. 27/03.

The Kajima / Nishimatsu / Mitsubishi / Enka / Dogus consortium has withdrawn from the bid for the subsea metro tunnel project to connect the Asian and European sides of Istanbul, also known as Marmaray. The consortium said that the contract conditions were difficult to fulfill. The expiry date for submitting an offer is 3rd October, 2003. Three consortia remain in the race. 38/03.

The transport ministry received two preliminary bids from Turkish-Japanese consortiums in a tender to build a rail tunnel under the Bosphorus straits between the European and Asian sides of Istanbul. The first consortium is formed by Taisei, Kumagai Gumi and Turkey's Gama and Nurol. The second group includes Obayashi and Turkey's Yapi Merkezi, Metis and Kiska. The $2.5 billion Marmaray project covers a distance of 13.1 km. The bids will be evaluated within two months. The first tunnel phase of the project, to be financed by the Japan Bank for International Cooperation (JBIC), is expected to cost around $800 million. The second phase, linking the tunnel to an existing rail line between the stations of Halkali and Gebze, is forecast to cost $700 million, while the trains and signalling in the third phase will cost around $1 billion. Officials plan to lay the foundation stone in the first quarter of 2004. 02/04.

A USD2 billion contract for the third crossing of the Bosphorus Strait was signed on 6th May by a consortium between Taisei, Kumagai Gumi, Gama and Nurol. Construction was officially launched on 9th May. The project, also known as Marmaray, includes a 13.3 km tunnel crossing and the upgrade of 63 km of suburban line to create a 76.3 km high capacity line between Gebze and Halkali. The Bosphorus Strait will be crossed by a 1.8 km immersed tube tunnel, composed of 18 elements sunk at a depth of approximately 60 m. This tube will be accessed by bored tunnels from Yenikapi on the European side and Sogutlucesme on the Asian side of Istanbul. Stations will be built at Sirkeci and Uskudar. The project is due to finish in 2008. Visit www.taisei.co.jp/english 21/04.

CPG Consultants of Singapore has been engaged by Taisei and its JV partners Kumagai, Gama and Nurol to lead the design of the 1,387 m immersed tunnel crossing under the Bosphorus Strait, which is part of the 13,558 m Marmara railway tunnel project to link the Asian and European continents. The USD1 billion project also involves the design and construction of three TBM-driven twin-tube sections (2 x 4,620 m, 2 x 3,343 m and 2 x 2,170 m from east to west), cut-and-cover portions and three underground stations, one on the Asian side (the Usukudar cut-and-cover station) and two on the European side (Yenikapi and Sirkuci, to be built respectively in cut-and-cover and NATM). Deepest station at about 50 m underground. Also Kazlicesme station at grade on the European side. The earthquake-proof immersed tunnel will be one of the deepest of its kind in the world, at 55 m below sea level at its lowest point. It is scheduled to be completed in 2009. The Bosphorus Strait joins the Marmara Sea with the Black Sea and separates Europe and Asia. Visit www.cpgcorp.com.sg and www.marmaray.com 05/05.

Open invitation to tender for design, execution and completion of 77 km-long Gebze-Halkali commuter rail upgrading as Contract CR3 of Marmaray project including equipping new Bosphorus tunnel. Contract starts April, 2011 for phased completion end-2013 to end-2014. Pre-bid meeting 15.09.2010. More from Ministry of Transportation, DLH in Ankara, tel +90 312203-1638, fax -1470, e-mail hamzasen@ubak.gov.tr. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=220958-2010. 30/10.

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Izmir - tr/15
Metro

Wayss & Freytag using Herrenknecht 6.5 m shield completed first 550 m in very unstable soil consisting of sand, silt, clay and gravel using bentonite and foam. Another 550 m tunnel and two at 800 m to be driven. Best advance 25 m/day. June 1998.

 

Second section in two parts: 3.2 km line through stations at University and Bornova involves 836 m tunnel, 1,480 m cut-and-cover and 715 m at surface; alignment through stations at Bahceliever, Haimevieri, the Islamic Institute, Poligone and F Altay involves 2.19 km of double-track tunnel with internal diameter of 11.8 m to be driven through andesite using NATM techniques. March 1999.

 

Prequalification for phase two cancelled and sent back to the drawing board. Plans now involve constructing just the section from Bahceliever to F Altay which now will comprise a 1.35 km bored tunnel and 2.85 km cut and cover, subject to detailed design. New prequalification planned for May, 2000. October 1999.

 

General contractor Yapi Merkezi reports completion of 11.5 km first stage with ten stations from Ucyol to Halkapynar including the workshop and depot area in less than four years. $600 million contract was handled on a turnkey basis by Adtranz-Yapi Merkezi for Municipality of Greater City of Izmir. Five of the stations and 5.8 km of the line are underground. The stations at Konak, Cankaya and Basmane were constructed by cut-and-cover 10-13 m below sea level using 25-33 m-deep diaphragm walls. The Ummuhan Ana twin tunnels of driven length 2.75 km were in waterlogged ground comprising sands, silts and clays. They were constructed by the Herrenknecht 6.54 m EPB using a VMT guidance system and lined with 1.2 m-wide, 5.7 m elastomeric-gasketted precast concrete 7 + 1 rings. Average advance was 19.2 m/day on the fourth drive with a maximum of 28.8 m or 24 rings in 2 x 12 h shifts. Measured settlements were less than the 10 mm allowable. Foam and bentonite injection was available on the machine. More from www.yapi-merkezi.com November 1999.

Consortium of STFA Muhendislik and Semaly on design and engineering for 5.2 km second stage from Ucyol to Fahrettin Altay for end-2000. Invitations to tender for construction are expected early-2001. Visit www.semaly.fr Sept 2000.

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Bolu - tr/16
Highway

Consultant: Geoconsult E-mail: office@gcs.co.at contact F L Jansky.

 

3 km-long x 150 sq m finished section twin-tube Bolu tunnel on North Anatolian motorway linking Ankara to Istanbul again under construction in weathered, faulted amphibolite by Astaldi following devastating earthquake in November, 1999 which caused 350 m collapse at each face. Articulated seismic lining design through active fault area, with 5 m-deep reinforced concrete invert and three-layer support comprising bolts, mesh, shotcrete, ribs and mass concrete. Second faces will be opened on Ankara side once 150 m-long cut-and-cover access completed. Visit www.astaldi.com and www.lombardi.ch 17/03.

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Anatolia - tr/17
Hydro
Announcement of award of engineering contract to consortium headed by Raytheon for $600 million Hakkari hydroelectric station with 178 m-high dam on Zap river and 208 MW power plant with 11.43 km headrace tunnel. April 2000.

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Mus - tr/18
Alpaslan Hydro

A U.S.-Turkish consortium has been awarded a contract by State Hydraulic Works of Turkey for the design phase of Alpaslan II Dam and Hydroelectric Power Plant Project. The value of the design phase contract is $6.98 million. The consortium will negotiate another contract for the construction phase of the project, which is estimated to cost $500 million.

This project is one of nine hydroelectric projects included in the 1998 US-Turkey Energy Protocol initiated by the U.S. Department of Commerce and the Republic of Turkey Ministry of Energy and Natural Resources. It is located in Eastern Turkey on a tributary to the Euphrates River, approximately 30 km north of the city of Mus, and will provide 200 MW of power, while serving as a source of irrigation for more than 70,000 hectares.

The members of the consortium led by Kaiser Engineers and Constructors, Inc. are Harza, ABB and Alpaslan II Construction Joint Venture (Özýþýk Ýnþaat ve Taahhüt; Yapý Merkezi Ýnþaat ve Sanayi; Ekinciler ve Ortaklarý Ýnþaat ve Ticaret Ltd; Su-Yapý Engineering and Consulting Inc.). General Electric, Voith Hydro Power Generation, and Duke Engineering and Services will also participate as subcontractors. Visit www.yapi-merkezi.com and www.kaiserengineers.com May 2000.

Two power tunnels, lengths 700 m and 750 m and diameters 5.5 m and 7.9 m, and two 8 m-diameter diversion tunnels, 870 m and 930 m long required, starting 2003. Under design for drill/blast in claystone with rockbolts, shotcrete and steel arches by Alpaslan consortium which includes Kaiser, Harza, ABB, Su Yapi with a jv of Ozisik, Yapi Merkezi and Ekinciler. Contact at www.harza.com October 2000.

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Antalya - tr/19
Railway

Award to OHL of contract, value $380 million, for renovation of 260 km-long Ankara-Istanbul railway with 9 km of new tunnels to be built over three years. Preliminary design underway together with some preparatory works. Visit www.obrascon.com December 2000.

Rehabilitation of 260 km-long railway will include construction of nine tunnels totalling 9 km. Engineering design by OHL, Alsim Alarko and Agrupacion Guinovart. Visit www.ohl.es 35/01.

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Black Sea - tr/20
Highway
500 km-long Kara Deniz highway under construction from Hopa to Samsun. First 18 km-long section from Georgia border at Hopa to Sarp includes 3 km-long twin tunnel in basalt excavated with handheld Atlas Copco BBR 16 pneumatic machines. Second 1.36 km twin tunnel underway by contractor Cengiz near Cayeli on six faces using two Atlas Copco L2D Rocket Boomers in basaltic tuff and agglomerate, and third site will require 500 m-long twin tunnels. Visit www.cengizgroup.com.tr and www.atlascopco.com December 2000.

Siemens is supplying an operations management and traffic control system to the value of around EUR57 million for 29 tunnels on a 4-lane road from Espiye to the Sarp/Batumi border checkpoint along the coast of the Black Sea in the direction of Georgia's border. Siemens will be installing a central control station with seven control substations as well as the entire technical infrastructure with traffic control, fire protection, fire fighting, power supply, lighting, and ventilation systems as well as communication and camera monitoring equipment with automatic event detection. Click here for more. Visit www.siemens.com/traffic 08/08.

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Borcka - tr/21
Hydro
Contractor Strabag constructing two 275 m-long x 100 sq m diversion tunnels, 620 m x 12 sq m grouting galleries, 140 m x 25 sq m access gallery, and 955 m x 75 sq m road tunnel for Borcka hydro project using four Atlas Copco drillrigs. Fleet will move 18 km upriver for similar programme at Muratli hydro project. Visit www.strabag.at and www.atlascopco.com December 2000.

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Adana-Gaziantep - tr/22
TAG Motorway

Tekfen reports completion of four 15 m-wide NATM tunnels: T1, 375 m; T2, 640 m; T3, 3.875 km; T4, 1.210 km. Project included an 11.5 m-diameter x 38 m-deep ventilation shaft. Visit www.tekfen.com.tr 38/01.

Tekfen reports 500 m-long, 15 m-wide, twin-tube Kirkgecit 7 and 350 m-long Cakit NATM tunnels on Ciftehan-Pozanti motorway under construction. Visit www.tekfen.com.tr 40/01.

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Konaktepe - tr/23
Hydropower

A consortium led by Stone & Webster has signed a $10 million contract for the engineering and design for the Konaktepe dam and hydroelectric power plant on the Munzur river near Ovacik in the Tunceli province, east central Turkey. This is the first of two phases of the project. The consortium will then negotiate the construction phase, estimated at $300-$400 million, which includes a 15 km power tunnel. The other members of the consortium are ATA Insaat Sanayi ve Ticaret A.S., a Turkish construction firm responsible for the dam and civil construction, Strabag of Austria for the tunnel and surge chamber, Soyak Uluslarasi Insaat ve Yatrim A.S., a Turkish construction firm who will assist Strabag with the tunnel and surge chamber, and VA Tech Hydro GmbH & Co., an Austrian electrical and mechanical equipment supplier, who will supply the hydro-mechanical and electrical equipment.
Visit www.shawgrp.com 13/02.

Strabag, member of the Stone and Webster-led Konaktepe consortium including ATA Insaat, Soyak, and VA Tech has awarded consulting services including geophysical surveys, geological and geotechnical modelling for the 14 km-long Konaktepe power tunnel to iC consulenten based in Salzburg, Austria. The project is located in Tunceli province, some 800 km east of Ankara. The power tunnel will have an inner diameter of about 6 m and will be TBM-driven. Site works commenced on 6th June, 2002. More from Dr. Johannes Kleberger, j.kleberger@ic-salzburg.at. Also visit www.ic-vienna.at 26/02.

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Izmir - tr/24
Railway
Prequalification for construction of the 80 km Izmir commuter train development project between Aliaga and Cumaovasi, including two double-track tunnels totalling 5 km. Prequalifiers will be announced on 16th January, 2003. Estimated tender value US$114 million. Visit http://ted.eur-op.eu.int/udl?request=Seek-Deliver&language=en&docid=181819-2002, OJ S 229, or contact Greater Izmir Municipality, Kararlar ve Tutanaklar Sube Müdürlügü (Directorate of decisions and protocols) or Rayli Sistem Müdürlügü (Department of railway systems), Cumhuriyet Bulvari, No. 1, Kat: 3, 35250 Konak, Izmir. Tel./fax +90 2324894691. 49/02.

Open invitation to tender, deadline 29.12.2008, for stage 2 rehabilitation works for Izmir commuter rail system including Karsiyaka tunnel, four stations and 3 km of route. Duration of works 180 days commencing five days from award. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=287898-2008 Contact Izmir Greater City Municipality, tel 232 293 1603, e-mail ataturkel@izmir.bel.tr 46/08.

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Zamanti River - tr/25
Irrigation
Construction of 10,700 m-long Zamanti diversion tunnel under way by contractor Akpinar Group. As of 5th February, 2003 the total excavated length is 3,284 m (3,064 metres from the outlet and 220 m from the inlet). Horse shoe-shaped tunnel with excavation diameter of 4.5 m (21 sq m) and finished diameter 3.5 m. Geology mainly consists of agglomerates and agglomerates and basalts. First
330 metres of the outlet section excavated with Paurat E134 roadheader and the remaining parts using drill/blast with Sandvik Tamrock jumbo, Volvo L-120 loader for loading and Volvo 5350 articulated dump trucks for hauling. Initial support by shotcrete and wire mesh Q188/188 and NPI 160 steel ribs (where necessary) and rock bolts (where necessary). Final lining in reinforced concrete.
US$50 million cost financed by the Ministry of energy and natural resources, General directorate of state hydraulic works. Visit www.sandviktamrock.com, www.akpinargroup.com.tr and www.dsi.gov.tr/enghm.htm 08/03.

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Kavak-Merzifon - tr/26
Highway
Invitation for prequalification, deadline 7th June, 2004 for upgrading of the Kavak-Merzifon Road (section II), approximately 18.7 km, to a two-lane dual carriageway, including a new alignment for 11.8 km consisting of four tunnels. Contact Ministry of Public Works and Settlement, General Directorate of Highways, Directorate of Cost Estimates and Specifications, Block D, Floor 2, 06100 Yucetepe, Ankara. Tel. +90 3124158011, fax +90 3124191662. E-mail fsaruhan@kgm.gov.tr 18/04.

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Marmara - tr/27
Hydropower
Tinsa will build a 11,820 m tunnel for Akenerji, as part of the Uluabat hydropower project in Bursa province, Marmara region. The excavated diameter is 5 m and the lined diameter 4.3 m. The project also includes a surge tank and down surge tunnel. A Herrenknecht slurry and hard rock mixshield will be used. The geology is weak metadetritic formation with clay zone on most of the length (10,800 m) and limestone (1,500 m). The tunnel will be lined with six 1.2 m-long precast concrete segments per ring, produced by the contractor Tinsa. Mucking-out by locomotive and muck cars. The expected date for tunnelling start is eight months from now. Visit www.akenerji.com.tr, www.tinsa.com.tr and www.herrenknecht.com 31-32/05.

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Central Anatolia - tr/28
Hydropower
Restricted call for tenders, deadline 15th August, 2006 for prequalification for the construction work of the Bagbasi dam and Mavi tunnel (blue tunnel). Work will include construction of the 109 m-high Bagbasi concrete faced rockfill dam and Mavi tunnel, which has an interior diameter of 4 m. As part of the tunnel, 17,061 m will be bored by TBM and 995 m bored by the conventional method. The project is located at Hadim district in the Konya province in Central Anatolia. Work is scheduled to start within 30 days following the notification date of the signed contract and should be completed in 1,800 calendar days. Visit http://ted.europa.eu/udl?request=Seek-Deliver&language=en&docid=121916-2006, OJ S 115, or contact General Directorate of State Hydraulic Works (DSI), Ankara, fax +90 3124183413. E-mail adundar@dsi.gov.tr 26/06.

The Bagbasi dam and 4 m-diameter Mavi tunnel, whereof 17,061 metres bored by TBM and 995 metres by conventional method, will be constructed by Ilci Group. The contract is worth EUR92.8 million. A groundbreaking ceremony took place on 6th July, 2007. Visit www.ilci.com.tr 32/07.

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Istanbul - tr/29
Highway
Invitation to prequalify, deadline 1st February, 2007 for construction works of five separate highway tunnels and their connection roads. The outlines of the five tenders are as follows:
1) Sariyer-Çayirbasi highway tunnel-Çayirbasi crossing and connection roads-Kestanelik crossing and connection roads: 4,100 metres of tunnel construction
2) Dolmabahçe-Fulya Arasi highway tunnel-Dolmabahçe crossing and connection roads-Fulya crossing and connection roads: 2,027 metres of tunnel construction
3) Eyüp Silahtaraga Caddesi-Gaziosmanpasa Caddesi highway tunnel and flyover with crossing and connection roads: 200 metres of tunnel construction
4) Fulya-Levazim highway tunnel: 4,450 metres of tunnel construction
5) Levazim-Akatlar highway tunnel-Levazim crossing and connection roads-Akatlar crossing and connection roads: 3,360 metres of tunnel construction.
Contact Istanbul Büyüksehir Belediyesi, Altyapi Hizmetleri Müdürlügü, M. Nezihi Özman Mah. Kasim Sok. No. 62, 34010 Merter-Güngören, Istanbul. Tel. +90 2124494000, fax +90 2124494470. E-mail altyapi@ibb.gov.tr. Click here. 05/07.
Within its investment programme, the Istanbul Metropolitan Municipality awarded last year the Dolmabahçe-Dolapdere-Piyalepasa-Kagithane highway tunnel to a consortium of Kiska Komandit and Mak-Yol at a price of YTL105 million. This is a 2 x 3,800 m-long tunnel, built in NATM using hydraulic hammers. The carriageway width is 9.5 m and the diameter is 14 m. There are four attacks (one from each side in each tunnel) and 2,100 metres has already been built. Visit www.kiskagroup.com and www.mak-yol.com.tr 05/07.

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