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Wehrhahnlinie / Unterfahrung Kaufhof an der Kö Düsseldorf
In Düsseldorf Germany, there is ongoing construction for the mostly subterranean conducted 3.4 km long underground "Werhahnlinie" for a faster and more comfortable connection between the urban districts in the east and in the west. The mobility of the passengers will be improved significantly. Bilfinger Construction GmbH is responsible for the execution of this major project.
The running tunnel of the new "Werhahn-Linie" was exclusively driven with the shield tunnelling method by a tunnel drilling machine. The first drivage lead from the "Rampe Bilk" in a northward direction to the station "Heinrich-Heine-Allee". This station will later be situated directly below the existing departement store "Kaufhof an der Kö". It was driven under the protection of a frozen foundation ground below the departement store "Kaufhof an der Kö". The tunnel section from the "Corneliusplatz" to "Rampe Bilk" was again excavated exclusively by the tunnel drilling machine.
Besides the station "Heinrich-Heine-Allee" all underground stations were constructed with cut and cover method with slotted walls. Thanks to this method, it was possible to enable interference-free traffic on the tunnel surface after terminating the construction of the slotted walls and the tunnel top. Furthermore the residents were protected against noise emmissions from the ongoing suberranean construction.
Mooser pneumatic external vibrators were used for the concrete compaction of the walls of the inner concrete shell, which was constructed subsequently to the slotted walls. The vibrators were operated for the concrete compaction of the high station walls, the pilons and the external mezzanine walls.
Mooser pneumatic vibrators have the advantage that they reach their nominal speed at once when providing the air supply. Thus they quickly pass through the natural frequency range of the formwork. The energy of the vibration is transmitted by the formwork skin directly to the concrete.
Thanks to the all-purpose STA mounting clamp, it is possible to mount and to relocate the vibrators onto different formwork systems. The mounting clamp consists of a basis part, which can be completed by formwork specific adaptors. It is suitable for nearly all formwork types and can be modified within a few minutes by the replacement of the adaptors.
Some examples of the vibrator application at the constructions sections of the "Werhahn-Linie" are shown below:
The single faced walls of the access ramp were constructed by means of a wooden girder formwork on basis of H20 girders and A-formed trestles. Mooser pneumatic external vibrators were mounted directly onto the H20 girders. They compacted the concrete of walls with a thickness up to 80cm with great success.
The external walls of the distribution levels and the station walls were constructed with help of a Framax steel girder formwork. The pneumatic external vibrators were mounted with a STA mounting clamp and formwork specific adaptor directly onto the steel girder formwork.
The up to 8m high walls of the station "Benratherstrasse" were formed by a Peri-Trio system. The pneumatic external vibrators were mounted onto the horizontal girders of the formwork by help of the BFD mounting clamp - a modified BFD alignement coupler. The vibrators were mounted in two rows along the formwork length and were relocated in height according to the pouring process.
Further construction sections, where the vibrators were mounted onto the Trio formwork by help of the BFD clamp were "Bahnhof Pempelforter Strasse TP251" and the north east end of the access ramp "Werhahn".
"Heinrich-Heine-Allee (Arge Unterfahrung Kaufhof an der Kö)":
The construction section "Heinrich-Heine-Allee", which was driven by help of a frozen foundation ground below the existing departement store "Kaufhof an der Kö", was the most difficult section. In the area of the access shaft, westward of the departement store, the Mooser vibrators were used onto a Meva STar Aluminium Formwork for the concrete compaction of the mezzanine walls as well as for the station walls underneath.