An SP 4800 stationary pump and the SPB 35 and SPB 30 separate placing booms are hard at work, pumping and placing the concrete in the TaunusTurm, in the heart of Frankfurt.Frankfurt, the city in Germany with the most high-rise buildings will soon be one high-rise richer. By the end of next year, project developers Tishman Speyer and Commerz Real AG, intend to erect the new TaunusTurm office tower in the middle of Frankfurt’s financial district between Neue Mainzer Strasse and the Wallanlagen Park.The building, designed by the architects Gruber + Kleine-Kranburg, will provide about 60,000 sq m of office space over 40 storeys and a height of 170 m. Specifically, the TaunusTurm consists of an office tower which is just under 170 m high, an underground car park and external facilities.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, 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, for eg, 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 cu m of concrete will be placed in the construction of the TaunusTurm. It is being pumped using a Schwing SP 4800 stationary concrete pump. In the well graded programme of the premium manufacturer this occupies a position in the upper middle range. The BP 4800 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 maximum concrete pressure of approximately 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 also possible to pump water. This happens on the job-site during cleaning. With the help of water the residual concrete in the delivery pipe is pumped almost up to the last litre 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 Leadership in Energy and Environmental Design (LEED) standard. This is the highest achievable rating in the LEED certification system, which is used to assess the environmental, social and economic sustainability of buildings.The concrete is placed using two Schwing separate placing booms.In the area of the residential tower, an SPB 30 from Schwing with a reach of 30 m was installed. The concrete is placed in the office tower using an SPB 35. This boom type has a horizontal reach of 35 m. Like all Schwing SPBs they are built with a four-section roll & fold boom.The advantages of the roll and fold design are even more evident when in use on the job site. 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 delivery pipe of 125 mm in diameter. With the separate placing booms, Schwing goes for proven technology from the use of truck-mounted concrete pumps. Both boom types offer a very great clear erection height even without counterweight. In such a 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, for example, when climbing using the self-climbing facility, and it facilitates erection directly next to the building core as it advances during construction.With continuous further development, which is conducted mostly together with the customers, Schwing is flexible in incorporating customers’ special wishes.For instance, the two booms on this job-site 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 under 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 job-site, which meant that the pipeline could always be laid in an ideal fashion.Work on the TaunusTurm will continue until the end of 2013.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.