Project: 110-metre-high office and residential tower, the WINX Tower, in Frankfurt am Main, Germany
Builder: Deutsche Immobilien Chancen AG & Co. KGaA, Frankfurt
Architects: KSP Jürgen Engel Architekten
Contractor: BAM Deutschland AG, Stuttgart, Germany
Engineering and support: MEVA Schalungs-Systeme, Haiterbach, Germany
The new Maintor district in one of Frankfurt’s top inner-city locations between the old town, Willy-Brandt-Platz and the banking district is almost complete. The centrepiece of the new district, which lies directly on the bank of the River Main, is the WINX Tower, whose shell will be ready in the spring of 2017. It consists of a 26-metre-high portal building with seven stories and a 110-metre high-rise tower with 30 stories, of which 2 are for the building plant. The ensemble of buildings offers space for shops, gastronomy, offices and flats over an area of 42,000 m².
Sustainable, trendsetting, flexible, spacious, comfortable. These are the attributes and building specifications that are being implemented here. The underground garage, for example, is equipped with bicycle parking spaces and parking spaces with mains power for electric cars. The lettable areas allow for flexible subdivision and use of space. The visitors, tenants and residents are welcomed in a 950 m² lobby and can relax in the Sky Lounge with the best view over the metropolis on the Main.
Safety takes centre stage
Maximum safety during the entire construction work, and building progress unimpaired by wind and weather were the requirements placed on the formwork supplier by the construction company, BAM Deutschland. The MEVA MGS and MGC climbing systems meet these requirements without problem. The MGS guided screen is used on the façades of the high-rise tower. The cores of the high-rise buildings are climbed using the MGC guided climbing system with Mammut wall formwork and integrated shaft platforms. With their closed housings, both climbing systems provide ideal protection from the elements and seamless fall protection. They are firmly secured to the building by means of guiding profiles during the entire construction work − even when being climbed. This permanent connection allows climbing at wind speeds up to 72 km/h.
MGS guided screen system on the façades
The slightly asymmetrical ground plan of the tower has obtuse angles on all sides and, in addition, inset balconies in the middle of the short sides. The lack of right angles gives the tower a lively dynamic. The MGS housing fully encloses all four sides of the building. This is achieved using 31 MGS units with lengths up to 6.81 metres and a material platform on each of the long sides to allow material to be supplied and removed by crane. A special platform is located on both short sides of the building to bridge the prefabricated balconies in the inset balconies. The housing covers three floors and protects the construction workers when performing slab formwork tasks. When the work on the top floor is complete, a safety barrier or similar equipment is installed to the slab edge at the lower floor of the housing to protect against falling. Thus, all exposed slab edges are secured at all times.
Firmly secured to the building at all heights, even when being climbed
The MGS units consist of vertical guiding profiles with horizontal square timbers to which the trapezoidal sheets are attached. The guiding profiles – red in the right-hand photo – are supported in the suspension shoes and slide upwards through these when climbing. The suspension shoes are anchored in pairs at the slab edge and adjusted with millimetre precision; they can be readjusted if required during climbing. Hence, each of the two guiding profiles is securely supported in two shoes at all heights. This clamping and sliding method is also used for the MGC climbing system and the shaft platforms; however, these systems use climbing shoes anchored in the walls.
Hydraulic climbing saves time
The MGS and MGC units and some of the shaft platforms are climbed hydraulically. This saves crane and waiting time. For climbing, a hydraulic jack is connected to each guiding profile. When the climbing process is complete, the hydraulic jacks are moved to the next climbing unit on a trolley together with the hydraulic unit.
MGC guided climbing system for the core of the high-rise building
The two-section core of the high-rise building is equipped with passenger lifts and staircases. Its walls are climbed using eight MGC units with lengths up to 8.47 metres and in the shafts using 16 shaft platforms. The 3.75-metrehigh walls are poured using Mammut wall formwork (2.50-metre-high panels, each height-extended with a 1.25-metre-high panel). The MGC units are also fully enclosed and equipped with access platforms on top of the wall formwork. The wall formwork is connected to the platform by the formwork clamping fixtures and the slide carriages. For rebar work and climbing, the wall formwork is simply moved back from the poured wall. This saves time and effort. The MGC units are also permanently attached to the building by means of guiding profiles and climbing shoes.
Shaft platforms: Climbing hydraulically and using a crane
Inside the shaft the wall formwork stands on shaft platforms whose guiding profiles are also held by climbing shoes. The shaft platforms are equipped with secondary platforms and are climbed hydraulically beyond the operating range of the crane. Hatches and ladders with safety cages allow safe access from one level to the next.
Tight working conditions require exceedingly precise logistics and work flow planning
The building site in the centre of the vibrant Frankfurt traffic system has only one access road and no external storage capacity. Not only do a wide range of formwork and construction materials need to be stored in this exceedingly confined space, but all MGS, MGC and shaft platform units also have to be assembled here. Every available square metre is planned in and used for storage purposes and various tasks. For this reason, it is imperative that the time schedule for the construction work, assembly work, and for delivery and return shipment of material is adhered to.
Four weeks ahead of schedule
“The formwork set-up is proceeding smoothly. Being able to climb independently with different systems not only saves time but also provides us with the flexibility required on demanding construction sites. In actual fact, we are now four weeks ahead of schedule”, according to Dieter Böhm, the site manager from BAM Deutschland.
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