• Seoyeong Engineering

    Wonju-Gangneung Railroad Construction Namdaecheon Bridge

    Gangneung, Gangwon, South Korea

Project Summary


A crucial link in the double-track railway project connecting Gangneung, Wonju, and Pyeongchang in time for the 2018 Pyeongchang Winter Olympics, the Namdaecheon Bridge is a 465-meter-long, 40-meter-high steel arch bridge across National Road 35. With supporting piers at 140-meter intervals crossing the national road, the steel arch required a special shape and sophisticated internal structure demanding concrete pouring. To eliminate air pockets resulting from the concrete pouring and ensure structural stability of the KRW 130.8 billion bridge, Seoyeong Engineering (Seoyeong) needed an integrated BIM approach.


Seoyeong applied BIM methodologies using AECOsim Building Designer, MicroStation, InRoads, and Bentley Navigator to model the structure and review and resolve potential issues to improve constructability. The team produced a 3D model of the steel arch and simulated behavior during concrete pouring to determine and eliminate the factors causing air pockets prior to construction. The interoperability of Bentley software facilitated information mobility to and from the worksite and enhanced collaboration optimizing workflow efficiency and decision making. 


Seoyeong reduced drafting times and the design review period, enabling the team to deliver the project one month ahead of the project deadline. Creating a 3D model to analyze and resolve potential air pocket, equipment, and traffic congestion issues improved constructability, minimizing materials and construction times and ultimately increasing ROI. Bentley software ensured structural stability on a crucial part of this railway infrastructure project, which upon completion will reduce travel time from Seoul to Gangneung from six hours to an hour and a half.


Seoyeong used AECOsim Building Designer to create a structural 3D model of the steel arch and InRoads to work on the surrounding access roads. MicroStation was used to integrate models for management in Bentley Navigator. The BIM model was used to monitor behavior during concrete pouring and eliminate risk factors that caused air pockets, improving constructability and ensuring structural stability. Bentley’s integrated BIM solution optimized information sharing and workflow processes, reducing workforce numbers, modeling time, and overall operating costs while accelerating project delivery.

  • The KRW 130.8 billion Namdaecheon Bridge project is a crucial link in the railway connecting Gangneung, Wonju, and Pyeongchang in time for the 2018 Pyeongchang Winter Olympics.
  • Seoyeong implemented an integrated BIM approach using Bentley software to address and eliminate air pocket formations resulting from the concrete pouring required to construct the sophisticated steel arch bridge structure.
  • Using Bentley software, Seoyeong met its project deliverable one month ahead of schedule, resolving potential issues prior to installation and construction to minimize construction materials and costs, and ensure overall structural stability.
  • Upon completion of the bridge and railway infrastructure project, travel time between Seoul and Gangneung will be reduced from six hours to an hour and a half.
  • "The design/construction quality definitely improved by the BIM materializations of the Bentley solution.”

    Sungsoon Im Deputy General Manager Seoyeong Engineering