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 High-tech eaves gutter on the ARENA AufSchalke What is probably the largest eaves gutter in the Ruhrgebiet was installed on the ARENA AufSchalke, completed in August 2001 and currently the most modern football stadium in Europe.
Fig. 2.3.1 Aerial photo of the ARENA AufSchalke building
site; We are not talking here about an eaves gutter in the conventional and generally known style, but a gutter construction of colossal dimensions. Accumulating rainwater must be diverted away from the approx. 45,000 m2 roof of the ARENA, expertly and as "invisibly" as possible. Further special technical requirements are also placed on the eaves gutter, such as: - mechanical separation of the eaves gutter from
the roof structure on account of horizontal extent of the roof
Fig. 2.3.2 to 2.3.3 Ground plan and cross-section of the stadium The entire gutter construction is mounted on 40 m long building concrete segments, which can move tri-axially at the joints in relation to each other, via elaborate expansion joints. The complete fulfilment of these requirements was realised on a galvanised steel support structure in a grid design, with a stable internal gutter in 10 mm thick steel sheet forming the bearing shell, the associated internal drainage made of steel pipes and the outer facing with light sandwich panels (steel facings with core insulation in polyurethane high-resistance foam), as well as inner panelling over the last grandstand row in a steel cassette construction, with defined mineral wool filling and perforated trapezoidal profiles as tested sound absorption wall. With its dimensions, this eaves gutter may
legitimately be designated the "largest of its kind" in the
Ruhrgebiet, and possibly even in Germany.
Fig. 2.3.4 Vertical cross-section of
the ARENA AufSchalke;
Fig.2.3.5 View into the 750 m long eaves gutter, which is completely faced with steel sandwich panels on the outside; Source: Author
The external dimensions of the entire eaves
gutter construction are: height approx. 4.6 m, with an overhang from the
outer edge of the building to the round "wing tip" also approx.
4.6 m. The facing of the eaves gutter support structure uses steel sandwich
panels with concealed fixing. For safety reasons, a second internal eaves
gutter was fitted in the area of the projecting tip, which separately
drains off the rain water from the inside eaves gutter slope, area approx.
1,440 m2. Circular sandwich panels were used for the outer facing termination
at the front edge of the eaves gutter. For this purpose it was necessary
to manufacture separate form templates, according to the preset radius
of the architectural shaping, in order to produce the sandwich preforms. .
Fig. 2.3.6 Pre-assembly of the inner eaves gutter
slope with sandwich panels (metal facings and core insulation in PUR high-resistance
foam); Source: Author A 60 µm thick strip coating of the type "Hairexel-Granite" was selected as the outer facing. The shade was specified by the building owner from the Corporate Identity of FC Schalke 04. The long-term stability of the striking blue of the entire outer facing is assured by the colour system selected.
Fig. 2.3.7 Shades of blue dominate the façade of the ARENA AufSchalke, which comply with the CI of FC Schalke 04; Source: Author All relevant edge parts were also produced from the same paint batch, so that no different colour effects would result even after prolonged weathering. Ventilation grids in the same shade were integrated into the gutter facing. A circumferential continuous neon blue roof light was also integrated into the lower gutter facing; its blue ray of light in the outer glass façade gives a very special light effect when it's dark. The inner wall termination to the ARENA inner side above the last grandstand row is also a constituent of the entire eaves gutter structure. The specialist PA company responsible for the ARENA AufSchalke had specified that an acoustic wall must be installed here, which must give an average sound absorption value of as³ 0.9. A wall with these requirements, consisting of a cantilever steel cassette construction with appropriate mineral wool lining and perforated trapezoidal profiles, had never been made before. For this reason, appropriate PA tests were successfully carried out at a state material testing department. It was possible to fulfil the required sound absorption curve. And as was proven by the first official events at the ARENA AufSchalke, the stadium PA and acoustics have been a real success.
A further special feature was the construction of
predefined expansion joints. Due to the topographical position of the
ARENA on an old pit site with ground subsidence, the entire circle of
the ARENA was constructed in individual solid concrete segments, each
approx. 40 m long. Each of these relatively large concrete segments can
move tri-axially, up to 40 mm. To accommodate these movements, special
expansion joints were developed, which extend throughout the entire grandstand
and façade structure, and consequently also across the eaves gutter.
Fig. 2.3.8 Unfaced steel substructure for the eaves gutter - in the foreground:substructure for the open roof structure; Source: Author
Fig. 2.3.8 Unfaced steel substructure for the eaves gutter - in the foreground:substructure for the open roof structure; Source: Author Another special feature is the connection of the gutter to the moving roof. The entire roof structure, a three-dimensional steel framework with a pavilion membrane roof, can move by + 400 mm on the horizontal plane. This meant that the gutter inlet could not be mechanically connected directly to the eaves gutter. This problem was solved by using small overhang roofs with faced steel trapezoidal profiles, which lead the water flowing off the pavilion roof into the gutter. To prevent the interior technology from architecturally impairing either the continuous band of the eaves gutter or the homogeneous glass façade with its ventilation, outgoing air and heating pipes, small polygonal corner roof panes were formed at eight corners, through which the entire installation system was led to the exterior. The internal gutters were additionally sealed with an EPDM coating. All of the special technical features described could not be solved one hundred percent at the time of planning. Much detailed work was carried out on site in collaboration with a competent structural management and with the cooperation of all involved. Special emphasis should be given to the logistical material flow and assembly sequence throughout the building phase. The general staff organisation guaranteed the building sequence and observance of schedule to the maximum extent, as the start of the federal division season 2001 meant that the completion date could not be moved. The outcome of and the public response to this
fascinating ARENA AufSchalke is now well-known throughout Europe from
radio, television and press. The high-tech eaves gutter, at a total cost
of approx. 2.3 million euros, corresponding to a price of just over 3,000
euros per metre of eaves gutter, contributes both functionally and architecturally
to the success of the ARENA AufSchalke.
Fig. 2.3.10 Polygonal corner roof panes during assembly; Source: Author Bauherr: FC Schalke 04-Stadion-Beteiligungsgesellschaft mbH, Gelsenkirchen Architekten: PPH INTERNATIONAL Planungsgesellschaft mbH in collaboration with architects Becker Koepcke AIG Fachplaner: Oostingh Staalbouw BV, NLKatwijk aan Zee. in collaboration with KUBUS bouw-kundig facilitair buro Generalunternehmen: HBM Bau GmbH; Essen
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