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Siekierkowska Road Junction, Warsaw, Poland
PERI superstructure formwork for reinforced concrete bridge - Fast moving procedure saves time and costs
A city of two extremes: on the one hand, the old part of Polish capital, Warsaw, has been declared a UNESCO World Heritage Site whilst at the same time it is considered as the largest construction site in Europe. Here, countless shopping centres and office highrises are currently being developed. Naturally, this means the infrastructure has to be continuously adapted to meet ever-increasing requirements.
In the eastern part of the city centre in the direction of the southern ring road, the well-known Siekierkowska route negotiates the Bora Komorowskiego road junction - on three levels and with no intersections - using the two OE-1 and OE-2 bridge constructions. The access ramps - 723 m and 419 m respectively - run up to twelve metres above the original ground level and what is now the current street level. PERI Warsaw offered the most cost-effective solution for construction of both the piers and retaining walls, as well as the bridge superstructure.
To ensure fast building progress, six casting segments around 50 m long in each case were to be formed at the same time. For forming the box-type cross-sections of the reinforced concrete bridges, PERI engineers designed raised formwork units on the basis of rentable standard components. In addition, VARIO steel walers could be rigidly connected to each other by means of articulated couplings. Alignment and fixing as well as adjusting to the variable geometry was carried out by means of SLS heavy-duty spindles.
The formwork units could be safely carried on MULTIPROP and ST 100 supporting frame constructions. MULTIPROP aluminium slab props could be connected using frames and then further extended to form a modular tower system. Different frame widths allowed optimal and customized load and geometry adjustment to take place, and the lightweight individual components ensured simple and fast assembly. Even the ST 100 stacking tower could be quickly erected as parts are simply slotted together without the need of any bolts or pins. The ST 100 is type-tested which means time-consuming static calculations are not required.
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ST 100 Stacking Tower
VARIO GT 24 Girder Wall Formwork
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Wlodzimierz Bielski
Site Manager
For striking, the PERI framed formwork units could be anchored to the bridge so that shoring could be dismantled. This meant we could save a lot of time as well as redusing the labour costs. Then for construction sites in inner-city areas, quickly moving the formwork is of particular importance.
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The special feature of the PERI solution was the fact that after concreting and reaching the required strength, the superstructure formwork was fixed to the bridge construction by means of DW 15 tie rods. Now the site crew was in a position to sectionally dismantle the shoring, and then install and align for the next stage of construction. Moving the laterally-divided raised formwork units subsequently took place without any time-consuming dismantling work required using crane and truck. The crane slings could be threaded through small openings in the superstructure down to the underside of the bridge and then be attached to the formwork at this point. After disconnecting the anchoring, the crane lowered the two formwork units one after the other onto the loading area of the waiting transporter in order to bring the bridge units to the next concreting section. This meant that the raised formwork units did not have to undergo any laborious dismantling process. With this, the formwork could be moved very quickly enabling the contractor to save time and costs. |
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PERI Press Release 02/2007
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