Award Winning Citadelle bridge between France and Germany - continued
This section of construction work is being managed by Dipl.-Ing. Oliver Stutzmann, the site manager responsible.
The two oval arch piers were made of fair-faced concrete using LOGO.3 formwork and handmade plywood. The requirement for using just 6 tie points was made possible through close collaboration between the production Paschal planning team.
To set up formwork on the foundations to the left and right of this lowered section of track, roughly 107 m² of system formwork. Concreting the abutments involved the use of about 140 m² of system formwork, while half was covered by an additional plywood layer for the fair-faced concrete.
With the help of the formwork planning specialists, the requirements were met for a uniform joint pattern to be achieved over the entire length of about 116 metres, at one point with a downhill gradient of 2.3° and at another point with an uphill gradient of 2.3° to create an ‘underpass’. This involved the section being sub-divided into seven separate concreting phases.
The formwork was designed to allow the self-compacting concrete to flow into the formwork up to its fill height.
This kind of concreting was selected in order to avoid the need for using any concrete pumps.
The concrete fills the entire section between the abutment and leading edge of the concrete structure.
Fair-faced concrete wall with a protective function
Once concreting work was completed on the abutment for the TGV/ICE line on the sunken piles, and after the concrete had set firmly, the LOGO.3 formwork was installed for a wall of fair-faced concrete extending over a length of 40 meters at the height of the tram line to clad and protect the piles between abutment and the lower leading edge of the concrete structure.
Every abutment was created below ground with 395 m² of formwork, with a further 118 m² above ground.
In order to concrete a total of 240 m² of concrete walls under the completed abutment, 64 m² of LOGO.3 formwork was mounted with an additional plywood layer and fitted with a filling nozzle through which it was possible to pour in the self-compacting concrete.
In 7 phases, each over a total length of about 22.70 metres on the south side, a concrete wall measuring 158 metres in length was built with the help of double laid formwork. On the north side, again over a length of 158 metres, a wall of fair-faced concrete was constructed with LOGO.3 formwork but without additional plywood layer.
A cutting had to be excavated on the north side wall and lined with concrete. For this, single-sided formwork was fitted on three sides. On the side adjacent to the tram line, double-sided formwork was used.
For this cutting, extending over a surface area of about 58 m², after the base plate had been concreted, the lower section of the wall was formed using single-sided formwork. Then the retaining walls were raised further. Double-sided formwork was used for this.
Two steel-reinforced concrete columns in fair-faced concrete were also built with the same formwork system, using only 6 tie points.
After completion, steel sheeting will span the entire lowered section of tram lines, supported by the oval steel-reinforced concrete piers.