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Using BIM to design Istanbul's first automated metro line

AEC Excellence Awards // 2018

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Navigating busy neighborhoods to design one of Istanbul's first fully automated subway lines

Prota Engineering uses Autodesk Revit BIM (Building Information Modeling) software throughout the entire lifecycle of its projects. The software recently helped the team design what will become one of Istanbul's busiest metro lines. It's part of the city's first fully automated subway system and one of the first self-driving metro lines in the world. With BIM providing real-time updates during construction, Prota Engineering estimates it saved nearly three years by eliminating the as-built project stage.

Expanding Istanbul Infrastructure

Headquartered in Ankara, Turkey, Prota Engineering has provided design, engineering and consultancy services for clients in more than 20 countries for more than 30 years.

Because of its experience planning and designing light rail systems, bus lines, airports and train stations, among other structures, Istanbul Metropolitan Municipality called upon Prota to design much of its metro rail line project—the city's first fully automated subway system and one of the few self-driving metro lines in the world.

Under the guidance of Building Information Modeling (BIM) coordinator Saniye Öktem, Prota Engineering oversaw design for the M9 Atakoy – Ikitelli metro line—the second metro project in Turkey tendered with BIM requirements. Prota also designed the Kabatas – Mecidiyekoy – Mahmutbey line, which won a 2017 AEC Excellence Award.

Using BIM virtually eliminated Prota's as-built project stage, which shaved nearly three years off its timeline. Istanbul Metropolitan Municipality was impressed enough with the results achieved with BIM that it decided to incorporate the technology into additional metro line projects.

An overview of the Atakoy – Ikitelli metro line project
Image courtesy of EMAY Engineering

 

Map of the Atakoy-Ikitelli Metro Line in Istanbul, Turkey

A historic city gets a "smart" subway upgrade

The world's second-oldest underground urban rail line belongs to Metro Istanbul, circa 1875. Nearly 150 years and many upgrades later, Metro Istanbul launched an extensive, and decidedly modern, expansion.

The agency plans to build a total of 284.7 kilometers of new metro rail lines, with the goal of establishing 1,000 total km of subway lines by 2023. The initiative includes building five new rail lines and 50 new stations.

The M9 Atakoy – Ikitelli metro line passes through some of Istanbul's busiest arteries across five districts. Stretching 13.5 km, the M9 integrates with six other metro lines and includes 11 stations. When it's complete, Prota expects the line to carry about 500,000 passengers daily.

An aerial view of Halkali Station construction
Image courtesy of Istanbul Metropolitan Municipality

 

An aerial view of Halkali Station construction

All hands on deck

The project's large scale means lots of hands involved. M9 design and construction involves about 150 contractors and more than 2,000 individuals. Efficient collaboration is key for the project's success.

Prota enlisted design teams in Istanbul, Ankara and Izmir for the project. Because the line integrates with six other metro lines, Prota also had to communicate and collaborate with designers and engineers involved in other metro line construction projects.

The M9 passes through several busy city districts, including the Ayamama River, which meant Prota had to stay mindful of existing infrastructure, homes and businesses. Finding shaft and station locations also proved challenging. When location scouting, Prota had to consider a "crooked" and crowded city structure, low soil strength, high earthquake loads and flood-prone areas.

The Solution

Autodesk Civil 3D and InfraWorks helped Prota identify and solve bottlenecks when passing through busy districts. Prota simulated Istanbul's terrain and located infrastructure displacements with Civil 3D.

In one case, Prota identified a 380-kilowatt electricity line located near Bahariye station. To work around the line, "We changed the concept design to two concourses in the early phase of the project," Öktem says. "With this design change we prevented four months of time loss."

The Prota team used 3D laser scanners to capture images of buildings around proposed station locations. They integrated that information into an Autodesk Revit model using ReCap. This allowed them to work with point clouds to pinpoint shaft and station locations. The InfraWorks Traffic Simulation tool help the team analyze traffic flow around the stations.

Point Cloud
Image courtesy of EMAY Engineering

 

Point cloud

Moving from BIM to VR
Image courtesy of Istanbul Metropolitan Municipality

 

Team members prepared models in Navisworks

Cloud-based solutions streamline collaboration

Stakeholders and contractors alike suffered from communication and collaboration overload. Cloud-based applications helped streamline the back-and-forth between teams, managers and stakeholders.

Prota chose BIM 360 Docs to communicate and share information among teams in three cities. "BIM 360 Docs provided seamless model and information-sharing among the team members," says Öktem.

During coordination meetings, team members examined prepared models in Autodesk Navisworks. They discussed design and technical issues using the models, shortening decision time. Öktem says Prota collected 505 total comments at coordination meetings for six stations. They resolved 69 of them and left 31 active for resolution during later stages. "All stakeholders agree we couldn’t have resolved these comments without BIM," she says.

During final design, for example, the Ataköy station clash detection process revealed 620 total clashes for all disciplines and increased to 1,718 depending on level of detail. At the end of five meetings, Prota resolved 855 issues with the aid of Navisworks.

Improving outcomes with BIM

When Istanbul Metropolitan Municipality started planning its ambitious rail system expansion, it knew it wanted to plan, design, construct, and manage the project more efficiently than past transportation projects. BIM processes helped save months off the construction timeline.

Uğur Çelik, BIM manager for UEMAY Engineering, says realistic quantities data obtained from BIM models helped shorten control times and allow for cross-check. Contractor Aga Enerji's BIM Manager, Evren Kayalıbağ, says accurate material and quantity takeoff in the design phase prevented "huge amounts of waste" on the construction site.

Procurement companies used room layouts from 3D models instead of 2D deliveries to make 3D shop drawings that adapted to BIM workflow. The M9 models were updated according to site information and existing conditions using BIM.

Prota used Autodesk Revit Live with an Oculus Rift headset to conduct Virtual Reality (VR) studies on stations. Meanwhile, the design team had fun studying stations buildings via the Unity Technologies game engine.

A tunnel on the M9 line in Istanbul
Image courtesy of EMAY Engineering
Moving from BIM to VR
Image courtesy of Istanbul Metropolitan Municipality

 

A tunnel on the M9 line in Istanbul

Through the Tunnels

Prota created 4D-ready tunnel models using Revit, Dynamo, AutoCAD and Civil 3D for Navisworks. Navisworks 4D simulations represented ground conditions and other parameters needed for tunnel excavation and final lining processes.

During the early phases, Prota prepared simulations for the tunnel boring machine (TBM)—a critical activity for underground lines. In one simulation, Prota noticed concrete platform construction was not complete when the TBM platform, which supports the machine, reached the 15 Temmuz stations. Armed with this information, the contractor's planning team could make necessary scheduling revisions.

A fire protection design team used Autodesk CFD Vibration analysis to set up smoke visibility and fire analysis in all stations and surrounding areas. The analysis helped to increase passenger and building safety.

Sustainability solutions

With the automated metro line project, Istanbul Metropolitan Municipality has a goal to reduce carbon emissions annually by 77,246 tons. It estimates the new lines will take 15,424 vehicles off the road, which goes a long way toward its goal.

To help meet the municipality's sustainability goals, Prota designed most stations with parks and green spaces. Construction teams will plant a total of 10,000 trees.

Stations will include skylights to save energy. To design these, Prota transferred energy and light values into Revit and imported them into DIALux software. In DIALux, designers could finalize lighting and skylight placement to achieve their energy and lighting goals.

Reinventing public transit

BIM technology allowed Prota Engineering and the dozens of other contractors to collaborate efficiently between multiple teams and locations. In the design phase, BIM helped shorten decision time, boost productivity and assist in the purchasing process.

The contractor realized 30% cost savings due to more efficient collaboration with manufacturers. By resolving complex issues in the infrastructure and design phase, the construction process was shortened by four months. And by eliminating the as-built project stage, Prota gained a couple years or more—time it can devote to its next infrastructure project.

While some government agencies hesitate to adopt new technology, Istanbul Metropolitan Municipality realized significant benefits by adopting BIM for one of the world's most advanced transit systems.

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