Replacing an outdated structure with a state of the art venue


Location

  • Stockholm, Sweden

Sector

  • Transport and Infrastructure
  • Tunnels
  • Rail and Transit
  • (View all)

Service

  • Archaeology and Heritage Buildings
  • Building Information Modelling - BIM
  • Geotechnical and Ground Engineering
  • (View all)

Client

  • The City of Stockholm

Project Value

  • Project value

Project Status

  • Ongoing

Centralised Underground Transport Hub Opens Up Development of Social Venues and Green Spaces

Slussen is a meeting point where underground, buses, commuter trains, boats, bikes, cars and pedestrians come together in a confined area. It is also a water gate connecting Lake Malar with the Baltic Sea. After 75 years of operation, Slussen has reached the end of its serviceable life and will be demolished and rebuilt from scratch. It will be converted into one of Stockholm's most attractive venues, with new squares, docks and the area's first park. Public transport will be allocated more space, as will pedestrians and cyclists, while surface car traffic will be reduced and adjusted to accommodate modern traffic planning requirements. 

The new bus terminal is located in a rock cavern. The preliminary design was executed by WSP, based on the architectural design of Foster + Partners. Once completed, it will provide a secure and modern hub for commuters from the Eastern part of Stockholm. The bus terminal is being developed to seamlessly integrate with commuter train and underground services, allowing for smooth and comfortable interchanges between buses, trains and underground, without leaving the station. 

Addressing Key Considerations, Including Heritage Preservation and Safety

This project presents a lot of challenges, including logistics in connection with construction work in the area, an extremely short time frame for design and construction, the complexity of the work, very high traffic volume, evacuation safety, consensus surrounding the location of the terminal, traffic safety inside the terminal, limited space for construction in order to maintain full traffic capacity, project planning with consultants and contractors in various areas, while also coordinating efforts with a separate client team and communicating with the public and local resident groups.

Massive amounts of rock will be excavated using blasting in this heavily urbanized area. This requires an extensive control program for measuring and controlling blast induced vibrations. The caverns are located in close proximity to existing underground structures such as a metro station, two parking garages and a public bomb shelter. This requires unconventional technical rock engineering solutions and advanced structural engineering. An access point will be created to the Metro station while the train traffic remains active at all times. 

The terminal is also close to an existing rock slope, with many old houses being right outside of the blasting- affected zone. These houses are marked as culturally valued objects that need to be preserved. For the rock excavation works, there will be many simultaneous ongoing tunnel faces, creating a logistically complex mass-haul/construction situation.

Another challenge is the massive amount of MEP needed in the terminal to handle crucial safety and comfort demands. The terminal is being used by buses fueled with natural gas, which creates huge demands for effective ventilation and gas detection systems, as well as creating a need for both the rock and structural elements to withstand extreme fire and explosion loads should an accident occur.

Concrete
12,000 m³
Rock Excavation
300,000 m³
Tunnel Height
12 m

Scope of Services

The detailed scope of WSP services includes permanent way, rock mechanics, structural engineering, road design, geotechnics, land development, surveying, cable ducting, light design, plumbing, geohydrology, risk analysis, telecommunications, project management, production planning, fire and safety, and water and sewerage. 

Sub-consultants are being used for ventilation and architecture.

 
nderground_Bus_Terminal_3

Using 3D BIM Design Models to Reduce Risk Profile

WSP has mobilized an experienced multi-disciplinary team of engineers, architects, town, traffic and construction planners, cost managers and environmentalists, who have established a clear strategy that aims to reduce the risk profile to the scheme, while providing development and clarity to the delivery program.

WSP’s experience in fire and risk management helped the client to get formal approval for the project, despite its complicated structure and high demands for safety given the gas buses using the terminal.

Additionally, WSP’s extensive experience with BIM plays a crucial role in the project, where the detailed design is delivered almost completely in the form of BIM models. For example, there are no measured drawings, with 3D models being used instead, directly to the total stations. Reinforcement is delivered only as 3D models, and the workers use tablets to place the reinforcement.

The tender design phase is completed and work on the detailed design began in late 2017, with two smaller parts already under construction. Construction of the terminal itself is set to commence in December 2018.

Our team delivered the following services:

  • Permanent Way
  • Rock Mechanics
  • Structural Engineering
  • Road Design, Geotechnics
  • Land Development
  • Surveying
  • Cable Ducting
  • Light Design
  • Plumbing
  • Geohydrology
  • Risk Analysis
  • Telecommunications
  • Project Management
  • Production Planning
  • Fire and Safety
  • Water and Sewerage

Also read:  Safety-Related Challenges When Developing an Underground Terminal for Compressed-Natural-Gas-Powered Buses