Mall of Scandinavia
Mall of Scandinavia, when finished in 2015, will be the largest shopping center in Scandinavia. This massive project is made in collaboration between Ruukki, which delivers the steel structures, Strängbetong and Ramboll, which provide precast concrete structure, general contractor Peab and several other companies. BIM is present throughout the project.Parts of the story of the Mall of Scandinavia
- Part 1:Summer 2012: Simultaneous construction and design
- Part 2: Winter 2012-2013: Ruukki works on the steel frame
- Part 3: Summer-Autumn 2013: Strängbetong and Ramboll Team up for Providing Precast Concrete
Strängbetong and Ramboll partner for delivering the precast concrete parts for the Mall of Scandinavia. They have a lot to produce: Above the ground level, most of the structures are precast concrete, including concrete columns, sandwich wall elements and lots of hollow core slabs, among which the ramps and light wells corresponding to skylight windows are the most complicated to manufacture.
The both parties are confident that their employees know what they do and do it well, using Tekla for modeling and creating element drawings. The both work on their own but exchange models and elements.
Strängbetong and Ramboll’s job in numbers
Moving forward in phases
To start, Ramboll and Strängbetong’s teams imported the architect’s Archicad model and designer Grontmij’s Tekla foundation model into Tekla Structures. General contractor Peab had chosen IFC as the medium for integrating models and transferring information between the different software solutions. The precast concrete team divided the Mall into nine blocks to keep the model size handier, and worked in phases through the blocks. Design and production proceed hand in hand.
Developing tools for automation
Strängbetong has developed tools to use with Tekla Structures to reduce manual labor.
“We hardly ever model anything by hand, we search inserts and such from our database,” says CAD & BIM Manager Tobias Svenberg from Strängbetong. “Our database contains all our standard items and we can use these to generate model in Tekla Structures. All inserts are made by generation routine. We use these to maintain modeling and information quality and reduce manual labor in modeling. The main benefit is the high model quality.”
“Our point is to remove the ‘how do I do this’ question, instead ask ‘I want these columns here’,” he continues.
“In the Mall of Scandinavia project, Ramboll is using our design tools in their office. The model looks exactly as if it was made at a Strängbetong design office,” says Svenberg. This allows Ramboll to transfer the elements straight to Strängbetongs’s production system.
Production and challenging logistics
In Strängbetong and Ramboll, BIM process has removed the need to type data manually in to the ERP, leading to less manual work and errors. Strängbetong utilizes the information like production status, casting dates, waybill numbers and delivery dates, in ERP and they can transfer and use these elsewhere. The numbered elements stay traceable from the design department to assembly as the model includes for example status information on if the element is manufactured, checked by the both parties, or delivered and assembled.
Ramboll benefits from the Tekla model in the design phase as they see when a certain element is needed for assembly.
“Logistics at the busy Mall of Scandinavia site are challenging. For delivering the elements, the builders book a slot of time for their vehicles to arrive like planes landing an airport,” says Peter Karlsson, Department Manager, Structural Engineering, from Ramboll.
Strängbetong’s factories produce most of the elements. The design office and project management are not located in the same premises, but the tracking system keeps the designers stay informed on where a certain element is fabricated.
Result: Better quality with better understanding
“Modeling with Tekla gives everyone involved better understanding, which is very important for the project,” says Tobias Svenberg. “You don’t have to make a mental 3D model out of fifty drawings when you have one in front of your eyes. That helps avoid potentially very expensive problems.”
Both Karlsson and Svenberg agree on the biggest contribution of Tekla’s BIM software.
“It is easy to see problems at once. You can’t solve the problems that you don’t see!” says Karlsson and Svenberg continues: “It is the project understanding between the project stakeholders.”
“Normally, we first check that everything is correct in the drawings, and then continue with the model to see that everything fits together. We see if we have support under the wall or if we need to add reinforcement. We use the model all the time, we think it is a great way to avoid problems,” says Peter Karlsson. “If the model is correct, we don’t have a problem. We can see that the guys on site have fewer problems if we make better models!”
Building of the Mall of Scandinavia is in early stage but Ruukki, which delivers the steel structures for the general contractor Peab, has already faced some challenges as the project is huge and they need to coordinate their work carefully. The company uses Tekla Structures for design, production of drawing and reports and DSTV files that communicate with the manufacturing machinery.
Ruukki at the Mall of Scandinavia
”We utilize Tekla for project planning and management whenever possible,” says Project Director Minna Kuusela-Opas, who leads the Mall of Scandinavia project in Ruukki.
Building as big as Mall of Scandinavia requires tons after tons of steel, which is designed and produced in four countries. In addition to site operations and part of design in Sweden, Ruukki’s workshops produce structural steel in Finland and Poland as does a subcontractor in Latvia. The Tekla Structures model and Ruukki’s workshop machines interface with each other using DSTV files for production of plates and profiles. For Ruukki, this leads to faster and easier operations in the workshop.
Long history with Tekla software
Ruukki started to use Tekla more than a decade ago. Today the company utilizes Tekla software in the design and management of projects as much as possible and has developed own Tekla environments.
“Because of the size of the Mall of Scandinavia project, we benefit significantly of Tekla’s features. We use it for planning and logistics, reporting, and communicating with each other in Ruukki while we work on design, production, installation and project management,“ says Minna Kuusela-Opas.
From Ruukki’s point of view, Building Information Modeling is necessary for projects like the Mall of Scandinavia. It is a large project with numerous project parties, and Ruukki has had to coordinate their actions with the other contractors. Overcoming logistic and information sharing challenges is a part of project management’s daily work, and to Ruukki’s experience it is vital for any successful project.
Tekla software for BIM has served Ruukki well in project management related tasks and for managing the constant changes. With help of the software, Ruukki designers know where each component belongs to and when a change occurs, the shared information is updated. Several designers both update the model information and use it.
For Ruukki, using Tekla has brought more efficiency to workflow, increased productivity and decreased errors. Today it has become difficult to compare the life before Tekla to present situation.
“I have led a number of large or otherwise challenging projects. As long as Tekla has been available, no other design software has been used in my projects. Tekla is an excellent tool that is significant for successful projects leading to successful business,” says Project Director Minna Kuusela-Opas of Ruukki.
Construction work at the Mall of Scandinavia started in January 2012. . The turnkey contractor Peab divided design and construction into eight phases, so different tasks from detailing to erecting go on simultaneously in separate parts of the construction project. During summer 2012 the building crew worked on the ground level, which obviously already is fully designed and detailed. At the same time, the engineers still have lots of work on the design and detailing of the upper floors. As the project proceeds in phases, the same group of engineers can design the Mall of Scandinavia from ground floor to roof.
Quite an amount of models to put together
On a construction site this large, one software solution is not enough. PEAB used Tekla BIMsight to put together about 160-200 models created with various software solutions. This makes Open BIM and choosing the file format very important. For the Mall, Peab selected IFC for combining model information, as a medium to integrate the models and to move the information from software to another, and DWG for information exchange between the consultants. Coordination and checking between the disciplines took place in meetings that PEAB organized and at the same time the disciplines were responsible not only for their own work but also coordinating with other discipilines.
BIM from the bidding
PEAB demanded the bidders to use BIM and include it in offers, and the company thought well through those demands. With the requirements, Peab gets what it wants without surprise surplus expenses. In the project BIM was mostly used for 3D visualizations, collaboration and controlling clashes.
Still, the Mall of Scandinavia could not be built without drawings. The Swedish legislation practically asks for building according to drawings, and construction industry is somewhat inclined to paper. Ability to produce good drawings is an asset for BIM software, but the modeling is not wasted as there are automated functions and numerous other benefits of BIM like elimination of mistakes, savings in time and money, less waste, and visualization of design.
What is Mall of Scandinavia?
- The largest shopping center in Scandinavia when opened in fall 2015
- 250 retail spaces in three floors, totaling about 100,000 m2 (over 1,000,000 ft2)
- Located in Sweden, in Stockholm’s new Arenastaden district
- The new district encompasses residences, a hotel featuring a large conference centre, office space, and sports and events arena for 65,000 spectators
About the project
- The turnkey contractor is Peab Sverige AB
- Developed, owned and operated by Unibail Rodamco
- 7-8 project parties with responsibilities like steel construction, concrete elements, HVAC, fire protection, architectural design etc.
- About 150 different models created during the construction and put together with Tekla BIMsight
- Construction started in January 2012, finished in fall 2015