New Abu Dhabi Airport Terminal Takes Off - page 4 of 6
Formwork from Peri Hong Kong has been used extensively in some very demanding engineering set-ups.
In addition, the Megashor system had to be reused for subsequent steel arches, so the design had to be versatile and easy to reconfigure into a new tower design.
The steel buttresses and transfer slabs used to form the foundations for these steel arches were supported by the company’s Rapidshor modular steel shoring system. Each steel buttress weighed up to 40 tonnes and the concrete transfer slabs were up to 2.5 metres thick.
Finally, with each of the 16 steel buttresses and concrete slabs mounted two floors up, they had to design a back propping solution for the two levels below the raft. This was achieved using its lightweight aluminium Alshor Plus shoring system.
Commenting on the engineering challenges faced in the project, RMD Kwikform UAE Engineering Manager, Anvar Sadat, said:
To achieve the architect’s stunning vision for this structure, we’ve incorporated a lot of complex engineering and design. Not only did the engineers have to account for extreme loading, but loading in a number of different planes and variations due to the affects of both thermal changes and wind.
TACJV also employed RMD Kwikform to design and supply equipment for a number of other structures for the Midfield Terminal building.
Complex slab solutions
This included back propping of the complex concrete structure of the airport slab. The slab itself had to be supported at key points to ensure the construction and halving joints, which created concrete cantilever structures, were formed correctly.
Here the formwork engineers designed a solution using Megashor to prop the concrete sections up to the raft levels on the transition areas, before concrete pour strips completed the structure. Using this system also allowed other specialist trades greater access to the work area, as the system used fewer legs and beams so it was easier to work around.
For the VIP area, Alshor Plus was used to support primary beams. These had a depth of up to 3.2 metres and a propping height of up to 13.5 metres. The system reduced the number of loose components used, and being an aluminium system, it decreased the manpower needed due to its lightweight but heavy loading capability. This allowed for the completion of this area in less than five months.
From internal bridges to ramps
The vast scale of the terminal building called for numerous additional projects, requiring engineering support.
One such project was an internal long span bridge. RMD Kwikform engineers designed modular Rapidshor steel shoring to support not only the concrete weight of the bridge, but also its steel buttress and precast central beams.
As part of the design process for this bridge, the engineers had to consider other site users, achieving load transference to meet special restrictions for mobile equipment platform users, and for those completing finishing works on the levels below.
Another unusual request saw engineers design a 20 metre temporary ramp with a five percent slope, allowing a 40 tonne tower crane to be moved between two levels. By using Megashor and steel Superslim Soldiers, the solution proved to be far more convenient than constructing a concrete ramp; the speed of erection and dismantling assisted the overall access and programme management of the site.