Mission BIMpossible: GS E&C chose Tekla for Parnas Hotel renovation and extension
GS E&C utilizes Tekla to efficiently and cost-effectively complete new construction as well as renovation and extension of Grand Inter-continental Seoul Parnas Hotel. PARNAS Hotel required new construction of a tower as well as renovation and extension of an existing hotel which is Grand Inter-continental Hotel. The construction project started in April 2013 and is scheduled to be completed in 2016. Having been established in 1985, the hotel inevitably has a long list of renovation history and, accordingly, is plagued with numerous discrepancies in its complex floor plans. Obviously, this means a lot of clashes in the construction fields, which needs to be identified and eliminated.
GS E&C faced numerous challenges, such as the hotel being running while going through renovation and extension, and also reviewing design errors and constructibility between structural design elements and fabricator’s shop model.
GS E&C is a general contractor with a design-build contract including not only building but also design management, and it is important to ensure that high design quality and constructibility are achieved. The company has chosen Tekla to carefully review the building design's architecture, structures, mechanical and electrical aspects, etc. in order to reduce costs and accelerate construction schedule.
Catching two birds with one stone: Time and cost efficiency
The team detected 50 clashes between RC beams of ramp slab and steel frame of temporal erection using Tekla in the design phase, therefore resolving a constructibility issue even before the construction of the new tower began.
"We decided to adopt Tekla Structures to detect clashes and also review constructibility for renovation and extension of existing hotel and construction of the new tower. Especially the construction of the new tower’s basement, consisting of steel and reinforced concrete, was difficult since there were many location discrepancies between RC beams and steel beams. With Tekla, we checked clashes and reviewed constructibility by merging temporal steel structures, architectural and structural models, and found 50 clashes between RC beams of the ramp slab and the steel frame for temporal erection. This allowed GS E&C to resolve all issues during coordination meetings, before the construction phase began. This is why GS E&C converted 2D-based drawings to 3D models, which led to successful detection of clashes in advance, eliminating risks and saving costs and time in construction," explained Yeon-suk Jeong, Ph.D., Architectural Preconstruction Team, GS E&C.
Using Tekla saves USD 225,000 through design optimization of mega-truss structures
The team also used Tekla Structures in the renovation of the banquet room in the hotel's Podium extension, which uses mega-truss structures to acquire broad space.
“Clash checks needed to precede the construction phase, since many facility elements, such as HVAC systems including ducts and pipes, electrical elements, stage equipment and catwalks for facility management and maintenance, are installed in between the mega-truss structures and a prompt re-adjustment has to be done if revisions are required in this section,” said Yeon-Suk Jeong. “So, we checked the construction accuracy by scanning the upper mega-truss structure in the section of the Podium extension with a 3D scanner and combined the scanned data with 3D Tekla Building Information Models. Reviewing this generated data ensured that there were no errors between them.”
After optimization with Tekla Structures
Using Tekla software allowed GS E&C to save 140 tons of steel, which amounts to about USD 225,000, thanks to optimizing the size and span of the mega-truss steel structures, which was initially done in order to find more room in the ceiling structures for the installation of facility elements. The installation process of erection bents that support the mega-truss structures is another critical path affecting the construction schedule. Reducing the required number of erection bents to be installed from eighteen to six enabled the company to save ten days of construction time.
Better collaboration and coordination with Tekla
GS E&C has been using Tekla in coordination meetings to eliminate all risks before construction begins. The shop-detailer for the steelworks used Tekla Structures for structural modeling and submitted the final shop results as 3D models. Then, the models were integrated for coordination with other model, created by MEP (mechanical, electrical, plumbing) subcontractors.
By merging temporary steel structures, architectural models and structural models together, the team was able to check for all the clashes and review the project's constructibility. Many project parties have attended the meetings, including the architectural designer, mechanical designer, steel fabricator, MEP subcontractors and general contractor and, sometimes, even clients for critical decision making.
“Tekla Structures, suitable for modeling a highly detailed steel structure, enables us to review all data in detail during our coordination meetings. With the software, we created detailed models including components down to nuts and bolts, allowing us to review design and constructibility in minute detail, which resulted in dramatic reduction of risk at the actual construction site as well as considerable cost reduction,” concluded Yeon-suk Jeong.
About GS Engineering and Construction
Since its establishment in 1969, GS E&C, a major Korean engineering and construction firm, has grown into Korea's best construction expert and, in 2010, was listed on the internationally recognized Dow Jones Sustainability Indices (DJSI) World.
GS E&C was also ranked the 28th among the 225 international contractors in the ENR (Engineer News Record) in 2013 with its balanced business portfolio ranging from architecture, housing, development and civil engineering to industrial plants, electric power generation and environmental projects both in Korea and international markets, and its sales revenue reached around USD 9 billion.