Connecting Eurasia Tunnel and Supporting Buildings by GMW Mimarlik Ltd. Sti

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DESIGN DETAILS
DESIGN NAME:
Connecting Eurasia

PRIMARY FUNCTION:
Tunnel and Supporting Buildings

INSPIRATION:
GMW has been appointed by the BOT consortium led by Yapi Merkezi of Istanbul to design the tunnel interiors and portals, Operation & Maintenance Building on the Asian side and supporting buildings at both ends of the tunnel. The proposed design for the tunnel interior aims to aid the smooth and safe flow of traffic with an anticipated average journey time of 4-5 minutes. The proposed motifs, colors and lighting, all inspired by the notion of ‘flow’, have been chosen to make this a safe and stimulating experience. The continuous wavelike motif painted on the walls, in multiple shades of grey, is evocative of both the constant flow of traffic between the two continents and the unique double-deck current system of the Bosphorus. Painted over this motif is a colored ‘ribbon’, which further symbolizes the journey between the two continents. The ‘purple ribbon’ of the Asian side gradually transmuting into the ‘yellow ribbon’ of the European side, and the fire escape lobbies clad in screens awash with light, serve as visual aides to help drivers sense their position within the tunnel. At each end of the tunnel, the ribbons transform into large metal sculptures in their respective colors. The Operation & Maintenance Building is placed hovering above the main site axis and overlooking the Asian entrance to the tunnel. Its service level is disguised behind the landscaped hill with the main body of the office building freely floating above. The perforated metal screen unifies all facades of the building and functions as solar shading. The other smaller service buildings are treated as simple utilitarian structures set in a parkland scene and are clad in fair-faced concrete panels and weathering steel.

UNIQUE PROPERTIES / PROJECT DESCRIPTION:
The Eurasia Road Tunnel will connect the continents of Europe and Asia via a highway tunnel going underneath the seabed when completed in 2017. The main aim of the tunnel is to provide a calm, safe, well lit, contemporary and well-designed direct link between two continents accommodating up to 100,000 vehicles per day. The scheme will also reduce greenhouse gas emissions and noise pollution.

OPERATION / FLOW / INTERACTION:
There are entrance and exit portals for both Asian and European sides. The two deck tunnel have 3 sections, the upper section the vehicles travel in an easterly direction, the middle section the vehicles travel in westerly direction and the lower section is for the services. Supporting buildings are located at both ends of the tunnel, comprising under and above ground accommodation housing mechanical and electrical services. Operation and Maintenance Building is to provide an office and maintenance facility. The building is two story tube which pays homage to the tunnel, reinforcing the visual connection. Primary Control Room will be to the east of the building looking down of the tunnel entrance and this will enable the control room staff to have a visual link to the vehicles entering the tunnel.

PROJECT DURATION AND LOCATION:
The project started in 2014 in Istanbul and is expected to be finished in 2017, Location: Istanbul, Turkey

FITS BEST INTO CATEGORY:
Architecture, Building and Structure Design

PRODUCTION / REALIZATION TECHNOLOGY:
Most advanced TBM (Tunnel Boring Machine) technologies will be used throughout the Bosphorus crossing spanning 3.4km while the other parts of the tunnel will constructed by NATM (New Austrain Tunnel Method) and Cut & Cover methods. The Eurasia Tunnel will be ranked 1st in the world among the mix-shield TBMs in terms of face pressure value and 6th in the world with excavation diameter with 13.7m Supporting buildings are concrete structures and block infill with insulation/render and metal mesh solar screen.

SPECIFICATIONS / TECHNICAL PROPERTIES:
The main design aspects of the tunnel interior and the finishes must meet the several standards to ensure tunnel safety and ease of maintenance : • Be designed to enhance tunnel lighting and visibility • Be fire resistant and precluded from producing toxic fumes during a fire • Be able to attenuate noise • Be easy to clean • Integrated with fireproofing system • Integrated with Signage and Way finding • To have a visually calm environment • Simple and clear signage • Landscaped and simple entrance and exit portals • Graphics on the tunnel walls for visual interest

TAGS:
Eurasia, Tunnel, Istanbul, Road Crossing, Connecting Eurasia, D-100 Road,

RESEARCH ABSTRACT:
There are several published studies that the road tunnel operators’ have initiated. A literature research is done thorough these studies to learn more about the human behavior in tunnels, why would people avoid the tunnels, what kind of properties are disliked and what would be the designers input can be to overcome these issues. Design team also conducted small study groups and personal interviews with other coworkers and family to learn the view of the drivers. Worldwide examples are also reviewed. The researches show that in general the drivers do not like the dark and monotonous tunnels. Some also say that they find it difficult to orient themselves. It is concluded that light and painted patterns at the walls are preferred and along with the fixed decorations, drivers’ attention can be kept alive with some projection applications The selection of appropriate finish based on these functional but also operational, aesthetic, economic, and public safety considerations.

CHALLENGE:
The most challenging part of the project was to satisfy the main constraints of the portal design; • Height restriction due to Historical Site • Tsunami Walls on European Site • Structural Requirements • Location of the sites • The high standards of the tunnel to ensure safety and maintenance There is an entrance and exit portal for the Asian side and the European side and all the sites are different. On the European side the site is within the UNESCO world heritage site of old Istanbul close to the Boukoleon Palace and it is only a few meters above the sea level. Therefore the Portals have to be designed to minimize the effect on the surrounding buildings and take in consideration the seismic and tsunami effects on the structure. The Asian portals are off the D-100 and close to Karacaahmet Mezarlığı. The existing site is currently a green open area and existing highways. The highways will be realigned to accommodate the new road junctions and entrance exit portals. To the west of the site is located the main Operation and Maintenance Building which will be a direct access to the tunnel interior. To the south of the site is located the Asian Ventilation and Substation buildings. Many designs were produced for the European side including pedestrian bridges to included public participation. However this was removed for safety reasons. Both portals have horizontal beams at 3m. centres for approximately 50m from the tunnel face for structural reasons linked to the tsunami effect on side walls. The design challenge was to reduce the strobe effect and be sensitive to the historic surroundings. As with the European side the Asian side had particular problems of a restricted site and high sided walls. Many designs for this site we produced with the aim to satisfy the design criteria set above. The final design solution for the portals is to have well landscaped site with semi mature trees and simple concrete walls and graphics applied to one of the side walls. The tunnel interior directly after/before the portal will be well lit to reduce the contrast and so enable smooth transition into/out of the tunnel. The exit portal will have cross beams above and to reduce the strobe effect from the shadows the beams will be in filled along the central section above the carriageways. This will enable a free area to be next to the side walls for ventilation and light. The soft landscaping around all the portals is important to reduce the light levels and the contrast between interior and exterior space.

ADDED DATE:
2015-02-20 16:50:47

TEAM MEMBERS (1) :
Ali Evrenay Ozveren, Dicle Demircioğlu, Russell Jones, Oya Kayabas, Gokce Berdan, Damla Turan, Okan Akben, Ezgi Ak

IMAGE CREDITS:
IMAGE #1, Illustrator Damla Turan, Tunnel Illustration, 2014,
IMAGE #2, Illustrator Damla Turan, Annex Buildings Sections, 2014,
IMAGE #3, Illustrator Damla Turan, Tunnel Entrance Sections, 2014,
IMAGE #4, Illustrator Damla Turan, Operation and Maintenance Building, 2014,
IMAGE #5, Illustrator Damla Turan, Operation and Maintenance Building, 2014,

Visit the following page to learn more: http://www.gmw.com.tr


CLIENT/STUDIO/BRAND DETAILS
NAME:
Avrasya Tuneli Isletme Insaat ve Yatirim A.S. (ATAS)

PROFILE:
Avrasya Tuneli Isletme Insaat ve Yatirim A.S. (ATAS) was set up in 2009 for realizing the Eurasia Tunnel Project. From Turkey, Yapi Merkezi and from South Korea, SK E&C companies are two equal shareholders of ATAS. Yapi Merkezi is one of Turkey’s and the world’s leading construction firms which has launched pioneer projects at universal level with its experience and store of knowledge of 50 years. SK E&C on the other hand, is the construction and engineering branch of SK Group, which ranks 65th in 2012 Fortune Global 500 list setting out the world’s largest companies, which is the third largest business group of South Korea. Yapi Merkezi and SK E&C have accomplished highly successful infrastructure and transportation projects in different regions of the world. The global experience of these two companies adds power to Eurasia Tunnel Project.



NOMINATION DETAILS

Connecting Eurasia Tunnel and Supporting Buildings by Gmw Mimarlik Ltd. Sti is a Nominee in Engineering, Construction and Infrastructure Design Category.

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AWARD DETAILS

Connecting Eurasia Tunnel and Supporting Buildings by Gmw Mimarlik Ltd. Sti is Winner in Engineering, Construction and Infrastructure Design Category, 2014 - 2015.



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