Water Retaining Structures
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Koudiat Acerdoune Dam, Algeria
Variable system solutions for an enormous dam wall
A massive 120 m high and 493 m long, the gravity dam is situated 80 km south-east of Algiers. The barrage across the river Isser has created a huge reservoir of 640 million m³ of valuable drinking and industrial water. Over a period of 6 years, more than 5 million m³ of earth was removed and a total of 1.6 million m³ rolled concrete was used in the construction.
The rolled concrete (also known as RCC = Roller Compacted Concrete) was placed in 30 cm layers with earth-moving equipment then compacted with rollers. With the 1.20 m x 0.78 m stepping of the foundations downstream, TRIO 120 panel served as as continuous side formwork, securely supported by lightweight VARIOKIT brace frames.
For the seven run-off channels with 57° inclinations, a 2 m thick smoothed structural concrete topping was to be installed. For this, VARIO GT 24 wall formwork elements were connected with adjustable climbing brackets. Adjustable working platforms provided horizontal operational areas. The SKS climbing scaffold in combination with VARIO guaranteed stable climbing units, especially for the vertical structural elements, if single-sided concreting and climbing without formwork anchors was carried out.
The gigantic dam project required, on the one hand, the use of easy to operate and highly flexible systems while, on the other, enormous quantities of formwork materials had to be available. Thus, for example, 600 climbing brackets were in use at the same time in order to carry out single-sided forming and climbing operations. These were made available within a very short time in sufficient numbers - with the help of the close coordination of PERI´s international logistic locations network.
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| PERI Systems In Use |
TRIO
SKS Single Sided Climbing System
VARIO GT 24 Girder Wall Formwork
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Roger Dunand-Chatellet, Senior Project Manager
Jean-Claude Mogno, Site Manager
“For the realization of the dam, PERI planned and supplied the complete formwork and scaffolding solution. The systems used could be flexibly adapted to the respective casting segments as well as the range of different requirements.”
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Handbook 2011
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