|
contents | technologies | |||||||||
| Shoring and assembly platform for 180-ton roof girder  The almost 80 metre long and 5.40 metre high truss girders made of steel form the basic construction for the roofing of the new multi-functional hall in the Croatian city of Split. Each of the main constructional elements – the up to three metre wide pairs of trusses - weighs a massive 180 tonnes. In order to be able to cost-effectively assemble the roof, consisting of eight such gigantic components, contractors Dinarik, in co-operation with the formwork and scaffolding specialists PERI, put together a very economical assembly concept. This envisages placing the main girders, which have already been pre-assembled on the ground, on temporary PERI UP shoring by means of two mobile cranes, then complete the assembly process and move it into its final position on the load bearing long-sided walls at a height of 15 metres. For this, the octagonally-shaped layout of the 80 x 120 metre sports facility requires a 16.75 metre long and high load-carrying scaffold construction.The PERI solution functions in equal measure as shoring and as an assembly platform, and allows site personnel to work very efficiently. Consequently, the pairs of trusses – which were delivered to the site in segments and then pre-fabricated on the ground – are lifted up and placed in position, and subsequently connected at seven-metre spacings to form a flat roof construction. Similar to the incremental launching method used in bridge building, this is gradually pushed along in a longitudinal direction - as if on rails – into the final position. In this way, assembly work is safe, cost-effective and requires only a minimum amount of construction time. The shoring The PERI UP module scaffolding provides ideal requirements with its high load concentrations at large heights. Firstly: the modular structure allows maximum adjustment to the defined bearing surfaces on the load-carrying capacity of the legs in the 25-centimetre grid. Secondly: the type test allows leg loads of 40 kN up to a height of 21.89 metres and greatly simplifies the proof of stability. Bearing loads on both sides of the roof trusses of 900 kN respectively are transferred via one HEB 300 steel girder on rentable PERI SRU 120 steel walers. These, in turn, are positioned in a lateral direction at distances of 75 centimetres on the PERI UP supporting structure. Pulled hydraulically, the truss girders slide along with the help of teflon plates in the direction of the 1.50 metre thick, load-bearing walls. The assembly platform The load-bearing system together with the bracing also serves as an assembly platform for the final assembly of the roof construction. The combination of PERI UP in the internal area of the arena and the externally-suspended SB brace frame system extends the 15 metre high working platform to an area reaching 22 x 80 metres. Horizontally-positioned and linked PERI brace frames, which are normally used for single-sided concreting for wall heights up to 8.75 m, serve in this case as a load-bearing support construction - 58 metres long and seven metres wide. Through the PERI UP modular scaffold system on the inside, the around eleven metre narrow erection area can be widened by means of integrated cantilevers above to almost 14 metres. Handball WM 2009 in Croatia With regard to the 2009 handball world championships which are taking place in Croatia, a number of modern sport halls are currently being constructed in six cities. With 12,500 seats, the new multi-functional arena in Split is the second-largest facility after Zagreb. It will eventually be part of the Lora sport and business complex, situated directly on the Mediterranean coastline. This ambitious 140-million euro project will be available for the first sport and cultural events in December 2008. write your comments about the article :: © 2008 Construction News :: home page |