Parapet wall finished units with base plate and ears/Revitalisiertes B�ro-Hochhaus �Lighttower �in Frankfurt

Will revaluation the building optically: The before-hung finished unit parapet walls made of reinforced concrete again set the B�ro-Hochhaus �Lighttower� to Frankfurt east port in scene. (Photo: Zuber concrete, Crailsheim.) (openPR) - always new buildings do not have to be, which provide for headlines. Also changes can fail spectacularly, as a revitalisiertes 75 meter proves high B�ro-Hochhaus to Frankfurt east port. �The before-hung finished unit parapet walls made of reinforced concrete represent a particularly interesting remark solution with the so-called �Lighttower: Apart from their conventional function as parapet wall they serve the new gl�sernen post latch plate front also for the accommodation of the decentralized arranged ventilation technology. The production of the finished units with anbetonierter base plate - and with before-hung parapet wall also with anbetonierten ears - special know-how and custom-made formworks required from the Zuber concrete work (Crailsheim).

Deka multistoried building renamed in �Lighttower the �received a comprehensive exterior and an internal �building Lifting �in the years 2003 to 2005. It reminds only in the dimension of the solidium of old, in the year 1962 delighted office buildings. In order to revalue the appearance impressively, the Darmst�dter architect's office Seiffert at the northeast corner of the building planned a sumptuously glassed, semicircular building projection. The glass pulpit dragging on over 16 projectiles gives 75 meters high multistoried building a modern, unmistakable appearance to that.

Multi-functional use of the office surface

Apart from the large core removal of the building the upper three floors and the fronts were completely broken off and again established afterwards. During the reorganization of the front the planners linked sent optical aspects with a user-friendly optimization of the effective area.

The sketch conception should permit a multi-functional and variable use in the form of single, team or open-plan offices. For the office space a depth was planned from 5,50 to 6.0 meters with a Achs and/or development screen line dimension of 1.35 meters. In order to lose no valuable effective area, in the before-hung front a multiplicity of house-technical components was integrated. The accommodation of the decentralized ventilation devices in the parapet wall permitted a particularly flexible, surface-saving room layout. With changes of use the building services - without structural changes - can become fair by adjustment of the building instrumentation changed needs.

Different parapet wall types

Depending upon place of work three fundamentally different parapet wall types had to be designed and manufactured. The types 1 and 2 were for the connection to the existing supports of the old building and/or the inserted precast concrete columns in the two again established to upper floors intended. Type 3 received as parapet wall write off-ends to glass pulpit a curved form.

�The manufactured finished units' were called �due to their appearance of us �troughs, describe managing director Laurenz Zuber. �You were not by the anbetonierte base plate and the ears with the type 1 parapet walls in the conventional sense. It was set also not like a conventional parapet wall on the existing cover, but attached completely before the building to the existing reinforced concrete columns of the old building. �Substantial reason for the manufacturing of the parapet wall elements with base plate was the demanded enlargement of the depth around 66 centimeters for the ventilation devices which can be installed. Two anbetonierte ears served 1 with the type as hanging up device - in the group with the concreted pipes.

Aufw�ndige formwork

With the production of the type of parapet wall 1 high accuracy to size was demanded. The small support dimensions permitted only minimum tolerances for hanging up the parapet wall elements. The temporal expenditure for the formwork proved as very high, since the complete interior between ears and base plate was to be filled out with a hollow box. As basic formwork a 25 meters long binder formwork was used, so that daily only four parapet wall elements could be produced. With the Ausschalen had to be proceeded because of the relatively slim disk thicknesses (parapet wall plate 12 cm, base plate 10 cm, ears 12 cm) with extreme caution, in order not to damage the hardened finished units.

The parapet wall finished units (type 3) for the glass pulpit should be originally manufactured in a piece. Since a normal road transport would not have been possible because of the developed large dimensions, the work planners of Zuber decided for the production in two separate parts. It took place due to special pulpit geometry in particularly a timber formwork developed for it. The manufactured types 3A and 3B were finally supplemented on the building site by a local stressing tire and interconnected.

Suspension over steel consoles with thorns

The assembly of the pieces of finished unit on the building site demonstrated the next to each other of classical finished unit assembly (type of parapet wall 1) and the installation of semifinished parts (type of parapet wall 2 and 3). The parapet walls of the type 1 were among themselves not connected. They were only attached with their ears to the existing reinforced concrete columns of the old building. For hanging up of type 1 steel consoles with thorns had to be attached at the supports. The thorns were to be inserted when assembling accurately into the concreted pipes of the ears, so that an point-exact storage of the parapet wall element on the consoles was ensured. The pipes were filled after using with sealing mortar. Within the range of the parapet wall cover the planners planned two set screws, which worked quasi as adjustable pressure plates against the existing cover of the old building. They offered at the same time the possibility of a fine adjustment of the new elements.

The parapet wall types 2 and 3 were concreted however by means of a connection armouring. Thereby a monolithic connection between support and parapet wall developed.

Supports, latch plates and Treppenl�ufe

The achievements of the concrete work Zuber furnished for the project were not only limited to the reinforced concrete parapet wall finished units. Also 20 precast concrete columns and latch plate of different type of construction were manufactured and supplied for the again established, upper two floors. The supports were a further characteristic of the change, since they clearly visibly stand for the viewer outside of the building. The support heads were connected by finished unit latch plates. The new floors were hung after the installation of the supports over anbetonierte consoles between the external supports. The thermal separation ensured the connection by ISO baskets.

For the new stairway at the northeast corner of the Lighttower the concrete work provided besides 39 prefabricated stairs runs. Together with 53 prefabricated cross girders altogether a capacity in the value of approximately 300,000 euro resulted.

Author: Dipl. - engineer Hans Gerd Heye

Building board

Owner: Deka real estates Investment GmbH, Frankfurt/Main.
Draft: Seifert planning architect and engineers, Darmstadt
General contractor: Wolff & Mueller GmbH & CO. Kg, high and civil engineering, branch Karlsruhe
Prefabrication: Zuber concrete work GmbH & CO. Kg, Crailsheim
Office surface Lighttower: 10,560 square meters
Total construction period Lighttower: September 2003 until April 2005

dako pr corporate communications
Darko Kosic
At the old person sheep stable 3-5
51373 Leverkusen
Tel.: 02 14 - 20 69 1-0
Fax: 02 14 - 20 69 1-50
Mail: d.kosic@dako-pr.de

The enterprise Zuber concrete work in Crailsheim is an efficient supplier for precast concrete parts such as precast floors, double walls, massif walls, stairs, massif roofs, constructional parts and special parts.

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