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| Versatile use of PERI UP for new and existing buildings  For the construction of a new bunker as well as refurbishment of an existing bunker at the Ruhleben waste incineration facility in Berlin, the PERI UP modular scaffolding system proved to be an extremely versatile solution: as a load-bearing scaffold for the structural work of the new waste and slag bunker along with a weather protection roof and assembly platform required for the extensive renovation work of the existing bunker roof while the plant was in operation. In the challenging new structure, among other things, intermediate slabs were to be constructed at various levels and in several areas. For supporting the slab formwork, a PERI UP birdcage scaffold with heights of up to 22.50 m was used. Due to the metric grid design, the scaffold could easily be adapted to suit the complex geometry as well as the transfer of a wide range of high loads. In areas of extreme loads, the legs were bundled together. In this way, the scaffold was able to safety transfer knife-edge loads of up to 280 kN/m – resulting from a downstand beam and an approximately 20 m high wall – into the ground from a height of more than 22 m. The static optimisation of the scaffold for the different areas along with the respective loads not only resulted in a reduction of material requirements on the construction site but also in a reduction of the time used for assembly and dismantling. A high degree of flexibility to the supporting structure also required the fact that ground contact areas on different levels had to be realised. These boundary conditions could also be implemented with PERI UP with maximum accuracy. The refurbishment work on the around 130 m long existing structure included replacing the floor slabs and the reinforced concrete purlins above the waste collection bunker. An important requirement for the Westerstede-based building contractor Matthäi was to realize these construction measures without incurring any stoppage to the daily operations at the waste incineration plant. In order not to limit plant operations in any way and to carry out the required work without interruption nor risk of compromising quality standards, a LGS weather protection roof was used. The 27 m long and 12 m wide protective construction spanned each section undergoing repair work. In the course of the refurbishment work, the weather protection roof was moved on rails to the following section. PERI designed a solution for mounting the rails on the existing parapet wall. The developed construction was planned on the basis of standard equipment taken from the product programme. For accessing the roof girders underneath the weather protection roof that were to be renovated, a PERI UP construction was designed which simultaneously served not only as a working platform but also as safety scaffold for the refurbishing operations. As a result, the roof structure and skylights could be replaced step-by-step as well as carrying out the re-coating of the remaining components – with maximum possible safety and only minimum disruption of daily plant operations. According to the contractor, it was thanks to the PERI solution that the tight construction schedule for the new building could be maintained along with implementation of all relevant working safety requirements. Those responsible for carrying out the work were very positive about the co operation throughout this somewhat unusual project: "Although the existing geometry could be recognized in part only after demolition work had been completed, PERI also developed practical and reliable solutions for special areas within a very short time." write your comments about the article :: © 2010 Construction News :: home page |