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Wastewater Treatment Plant, As Samra, Jordan
Cost-effective wall and slab construction
PERI tie system ensures sealed tie points
After only a three-year construction period, work on the shell of the large-scale As Samra wastewater treatment facility has now been to a large extent completed. The plant commences operations at the beginning of 2007 and will treat on average 267,000 cubic metres of sewage water per day with a maximum daily performance rising to 530,000 cubic metres if required. With the two main conurbation areas of Amman and Zarqa, half of the population of Jordan is connected to the sewage system through an almost 30 km long waste water disposal line. The purification plant has been built and is operated as a so-called BOT project (Build-Operate-Transfer) by the Morganti Group. This public-private operating model facilitated project financing by means of integrating private enterprises into infrastructure projects. After a 25-year operating period, the plant then becomes the property of the Jordanian government in 2028.
For around sixty individual structures, formwork and scaffolding specialist, PERI, provided the most economical solutions. Among other things, eight circular aeration tanks as well as eight final settling basins, with diameters of 65 and 54 metres respectively, were to be constructed on the premise of maintaining a very tight schedule and as cost-effectively as possible. Four digester tanks, each with 34 m diameters and heights of 24 meters, will serve to reduce the accumulation of sewage sludge.
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DK - SK Tie system
GT 24
VT 20K
VARIO GT 24 Girder Wall Formwork
MULTIFLEX Girder Slab Formwork
PERI UP Rosett
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Ghassan A. Kawash
Project Manager
“PERI was able to provide us with comprehensive and practical solutions. The designated formwork and scaffolding systems were extremely versatile and simple to assemble. The cooperation with PERI was also throughout positive.”
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On the extensive site facilities, close to 5,500 m² of wall formwork and 1,000 m² slab formwork were maintained at the same time. For the walls, PERI VARIO GT 24 girder wall formwork was used. This meant that all construction units and applications could be cost-effectively produced using only one flexible system. For forming the circular-shaped walls, GKZ articulated couplings ensured that there was always a tight (tension and compression) connection between the steel walers. The six and nine metre high walls were divided into two, and sometimes, three vertical casting segments. Forming the higher levels was carried out by placing the VARIO formwork on type-tested CB climbing brackets. For the MULTIFLEX girder slab formwork in the digester dome, PERI engineers selected a very economical solution consisting of load-bearing GT 24 and inexpensive VT 20 girders. With type-tested PERI UP Rosett shoring, up to 40 kN per leg could be safely transferred with heights of 20 metres. |
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As is the case for all hydro-engineering installations, increased demands were also made on the structure´s impermeability with this project. The PERI DK tie system used here meant that the high degree of watertightness required throughout could be achieved without any difficulty. The DK tie set consists of reusable sealing cones which are fitted to the spacer on both sides and encloses the tie rod. After striking has taken place and the required concrete strength has been reached, the cone can be removed by means of a screwdriver or special cone spanner. Effective sealing of the tie points is carried out with special PERI concrete cones which are tightly bonded in place with a suitable sealing compound. This PERI technology prevents common installation errors using conventional methods and allows the use of continuous tie rods. The PERI tie system is certified by the Bavarian LGA´s materials testing laboratory and proven on countless construction sites around the world. |
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The selected PERI formwork and scaffolding systems made it possible for the contractor to fulfil all requirements cost-effectively in spite of the tight construction schedule. The systems were extremely versatile and very easy to use. The solutions developed by PERI engineers and the local site management, along with support provided by PERI specialists, contributed to efficient and problem-free construction. |
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Within a period of only one year, almost ninety per cent of the entire reinforced concrete work – totalling around 70,000 cubic metres – was completed. The high quality of workmanship and the PERI tie technology with its reliable sealing characteristics could be confirmed once again during recent leakage tests. Morganti´s project manager Ghassan A. Kawash was highly pleased with the comprehensive PERI solutions and emphasized also the cooperative spirit. |
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PERI Press Release
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