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and dead loads. The support system had to coping with

vertical loads of up to 500 kN and horizontal loads of up

to 75 kN.

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 sys-

tem. 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 con-

crete 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 oth-

er 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 en-

sure the construction and

halving joints, which created con-

crete 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 con-

crete 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 numer-

ous 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

Formwork from Peri Hong Kong

has been used extensively in some

very demanding engineering

set-ups.

Contractors World International Vol 7 No 3

14

Contractors World International