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Saadiyat Bridge, Abu Dhabi, United Arab Emirates
Inclined piers and impressive superstructure constructed with system formwork
The Saadiyat Bridge connects Abu Dhabi City and Saadiyat Island - an island which lies about 500 metres off the coast. With a length of 1,455 metre long and an impressive width of 60 metres, the construction is one of the widest bridges in the world. Eight foreland piers in the west and a total of eleven on Saadiyat itself serve to support the three pre-stressed concrete hollow boxes with spans ranging between 45 and 135 m.
The main bridge has a span of 200 m and is carried by two V-shaped, 20-metre high identical sets of piers per section. The formwork and scaffolding solution for the individual supports, with inclinations of more than 27 degrees, consists of two sets of VARIO GT 24 side formwork, a forwardinclined VARIO formwork element with integrated working platforms as well as a reverse-inclined raised formwork unit. Due to the high concreting loads, this was carried on PERI UP shoring.
The bridge piers were constructed alternatively in four climbing steps with concreting cycle heights of 4.70 m as well as by 2.44 metres in an outward direction in each case due to the pier inclination. The PERI concept allowed the supporting frame construction to be pulled outwards on the steel girders after striking had been completed as though being guided along rails. For efficient realization of the required supporting and platform levels, three tower modules each with a 2.00 m base and a 4.65 m extension height could be vertically coupled together. Connections were carried out with the time-saving PERI section spindle and the extension units could therefore be accurately adjusted to the required height. Through the extensively dimensioned moving units, it was possible to construct the total of 48 casting segments with only four sets of formwork extremely cost-effectively.
The PERI know-how was also in demand for all other construction phases as well – for both abutments, the numerous bridge piers in the foreland area through to the superstructure formwork. For the construction of the pre-stressed concrete hollow boxes, three different building methods were used: the western foreland bridge was realized using the incremental launching method, for the superstructure on Saadiyat Island in the east, falsework served as a flat and even support, while the large spans in the middle bridge section are concreted by means of the balanced cantilever method.
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PERI UP Rosett Shear Frame Arrangement
PERI UP Rosett Shoring Tower
VARIO GT 24 Girder Wall Formwork
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Jens Nagel
Deputy Project Manager
“From PERI, we are used to getting reliability - for the technical support and the systems. The formwork solution used with VARIO and raised formwork units is extremely stable and the the PERI UP modular scaffold is easy to install and flexible in use. The moving procedure is
carried out with large-sized transportable units.”
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Alexander Schmalz
Site Manager
“With the PERI formwork solution for the cantilevered construction, it was possible for us to minimize the work involved for adapting to the different bridge cross-sections from cycle to cycle.”
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Press Release 04/2008
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