Züblin Again Calls In Schwing


Frankfurt, the city with the most high-rise buildings in Germany, will soon be one high-rise richer. By the end of next year the project developers Tishman Speyer and Commerz Real AG intend to erect the new TaunusTurm office tower in the middle of Frankfurt's financial district. The building, designed by the architects Gruber + Kleine-Kranburg, will provide about 60,000 m2 of office space over 40 storeys and a height of 170 m.

The company Züblin has been contracted for the planning, co-ordination and turnkey completion of the TaunusTurm. The concrete is being delivered by Sehring Beton GmbH & Co. KG, from Frankfurt. The pumping of the concrete is the job of Godel Beton GmbH from Stuttgart. This company has extensive expertise in the field of vertical and long-distance pumping, e.g. from working on construction of the new ECB head office in Frankfurt – where the entire concrete work has also been done with Schwing and Stetter equipment.

In all, 70,000 m³ of concrete will be placed in the construction of the TaunusTurm. It is being pumped using a Schwing SP 4800 stationary concrete pump. The pump is available as required with a pump cylinder diameter of 180 or 200 mm. It has a 2 m long-stroke pump kit and thus achieves a max. concrete pressure of approx. 200 bar. The heart of every Schwing concrete pump is the patented Rock Valve. With this concrete valve it is possible to achieve both high concrete pressures and a high output with low wear. Because the Schwing Rock Valve is self-sealing, it is of course also possible to pump water.

This happens on the jobsite during cleaning. With the help of water, the residual concrete in the delivery pipe is pumped almost up to the last liter to the placement location. As compared with cleaning by air this offers two crucial benefits:

  • 1. Thanks to the controllable pressure conditions of water as a medium, the level of safety is substantially higher than with air cleaning.
  • 2. Hardly any residual concrete remains, which means a substantial cost benefit.
  • A further, decidedly difficult to measure advantage for the operator and for the developer, is the high energy efficiency of the Schwing concrete pumps used. With the open hydraulic oil circuit and the use of hydraulic components developed and manufactured in-house specifically for use in concrete pumps, Schwing pump units are always of the highest efficiency. This of course saves costs and protects the environment.

This fits particularly well with the construction of the TaunusTurm, since this is intended to be the first new Frankfurt high-rise project with platinum certification to the international LEED standard.

The concrete is placed using two Schwing Separate Placing Booms (SPB). In the area of the residential tower a SPB 30 from Schwing with a reach of 30 m was installed. The concrete is placed in the office tower using a SPB 35. This boom type has a horizontal reach of 35 m. Like all Schwing SPBs, they are built with a 4-section Roll&Fold boom. The advantages of the this design are even more evident when in use on the jobsite. For example, the boom is in the concreting position immediately after it has been unfolded, it offers very simple operation and catches the end hose without vertical stretching when folding. The two boom types differ only in their reach. All mounted parts, such as the column element, base crosses for fixing to the floor, the ceiling frame to fix the boom to the ceilings, self-climbing facility and other mounted parts such as ladders can be interchanged quite simply.

All separate Schwing placing booms with their divisible base boom are also equipped with a 125 mm-diameter delivery pipe. With its SPBs, Schwing relies on technology proven on truck-mounted concrete pumps. Both boom types offer a great erection height even without counterweight. In this case, and in consultation with Schwing Design Department, the SPB 35 can therefore operate with a maximum erection height of almost 20 m without counterweight. This considerably simplifies the whole working process and it facilitates erection directly next to the building core as it advances during construction.

With continuous development and working closely with its customers, Schwing can adapt its machines to meet special challenges. For instance the two booms on this project were also supplied with concrete shut-off valves. This option requires a specific internal safety concept, but it protects against dangerous “dripping” of the concrete, and especially in building construction where workers are often located below the concreting point. The two booms are controlled, as is usual with truck-mounted concrete pumps, by a fully proportional radio control system.

The whole pipeline, from the stationary concrete pump to the placing booms, has also been supplied by Schwing. The delivery pipes manufactured in-house at Schwing with the pressure stages of 160 and 200 bar were installed in the building in accordance with the pressure arising in the pumps. The pipe holders needed here were adapted by Schwing specifically for the project, which meant that the pipeline could always be laid in an ideal fashion.

Work on the TaunusTurm will continue until the end of 2013

Source: Schwing GmbH

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