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Rising to the challenges

A ten-lane cable-stayed bridge over the Sava River should significantly ease the severe traffic congestion in the Serbian capital Belgrade. construction of the suspension tower required an all-inclusive automatic climbingformwork solution. The 45m wide superstructure is being built by the incremental launching method using Doka formwork technology. The cross sectiontapers significantly as the tower rises and the automatic climbing formwork was designed using a detailed three-dimensional solid model. The bogeyunits carrying the large area Top 50 beam formwork assemblies can be moved on special rails along the climbing platforms and precision adjusted quickly and speedily to suit the changing radius. Space is at a premium as the two legs of the tower come together so from the 13th concreting section on upwards the formwork on leg 1 climbs up to three sections ahead of itscounterpart on leg 2. The leg 1 formwork is removed after the 22nd concreting section so that the formwork on leg 2 can complete its climb unhindered. A cable-stayed bridge structure and two viaducts along the Ronda Sur road in Toledo Province, Spain are being constructed with formwork and falsework from RMD Kwikform Iberica. A temporary peninsula has been created inthe river below the bridge while construction takes place. For the bridgedeck to be poured and cast in one go, the formwork for the bridge's four internal cavities had to be accommodated. The 4.5m high, 22m deep and 16m wide bulkhead which provides the stage for the single pylonn, is built on a 4m high pier structure, meaning that formwork was required to accommodate a height of 8.5m and withstand the pressure of enough concrete to cast the bulkhead in a single pour. The solution consisted of formwork panels using Superslim Soldiers as primary vertical beams, and secondary T200 timber cross beams. These are then supported with adjustable Superslim Soldier props called push-pull props, which are adjusted between its axis. The formwork for the 515m long cable-stayed Terenez bridge in France is also described. It used adaptable ACS self-climbing technology and the VARIO GT 24 girder wall formwork system for the construction of the bridge pylons. With the help of the ACS climbing device, all four pier sides could be climbed together without intermediate anchoring, securing the working platforms.