Yesterday, Sport-locker.net brought you behind the scenes at the Allianz Arena in Munich, the venue for the Champions League final in May.
And today, we’ve got some interesting facts and figures for you (take a deep breath people)…
Roof / Air cushion
The roof of the Allianz Arena consists of 2,874 air cushions and has a total surface area of 64,000 square meters – the world’s biggest roof made of foil.
The foil is only 0.2 mm thick and up to 98% UV-permeable. Each cushion has a surface area of approximately 35 square meters, although none of the honeycombs has precisely the same shape.
Giant fans underneath the stadium pump up the cushions and ensure that there is always an adequate supply of air available. If the blower fails and water collects during the resulting cooling process, a type of valve opens at the lowest point so that the moisture can flow away before the mass of water overloads the roof construction.
If snow settles on the roof during winter, a total of 12 pressure sensors measure the snow and trigger a pressure increase in the cushions to balance out this load. The membranes have a self-cleaning coat and are ventilated continuously.
They are one thirtieth of the weight of glass. The Allianz Arena can be illuminated in the colors white, red and blue. The light can be changed within the space of two minutes in order to exclude a hazard on the highway.
The grass covers an area of 72 meters width and 111 meters length (pitch itself: 68 x 105 meters), corresponding to an area of around 8,000 square meters. The sections of turf measuring 2.20 metres in width and 15 m in length were delivered in 250 rolls, each roll weighing 1.2 tons.
20 heavy transporters were required for this job. The “Powerturf” is 30 mm thick and it has been specially developed based on three different types of grass with extra wide and hard blades that also grow well in the shade and withstand heavy use.
The pitch also has an incline of 0.5 % up to the centre spot, because the centre of the pitch is subject to more wear and tear than the periphery.
After the grass has been laid, it can be played on immediately. The roots start to grow after two days and the turf is completely anchored in the ground after two weeks.
4,500 cubic meters of frost-protection gravel formed a foundation between 30 and 70 cm thick to level the area. The base comprises a drainage layer (10 cm) and the pipes to heat the grass are positioned on top of this, followed by a 13 cm lower substrate for the turf and a 9 cm higher substrate.
The temperature can be regulated either manually or automatically using pipes that are 3.2 cm thick and 27 km long, via a distributor that supplies three insulated pipes.
The heat generated varies between 35 and a maximum of 50 degrees Celsius. 14 fully perforated pipes, each 111 meters long and with a diameter of 10 cm, are positioned in the drainage layer. These pipes ensure constant drainage of water to prevent the turf receiving too much water from the rain.
A completely new stadium seat has been created by architects Herzog & de Meuron specifically for the Allianz Arena. These seats are a unique design.
Uniformity is the special feature of this seating family. While in other stadiums, standard seats and box seating generally have completely different designs, the three different forms of seating used in the Allianz Arena (standard folding seat, VIP seat and box seat) will all have a uniform appearance.
The silver coating of the seats provides an additional visual feature. The seats reflect a different color tone, depending on the angle of incidence for the light.
Each individual seating space had to be marked by hand before the first seat was installed in the Allianz Arena. These operations down to the last millimeter were necessary because the Allianz Arena is not rectangular but has curves. The chairs are all the same size, but the gaps between them vary. More than 130,000 holes had to be drilled in order to assemble 69,000 seats.
The distance between the edge of the pitch (dimensions 68 x 105 meters) and the first row of seats is only 6 meters along the length of the pitch and eight meters behind the goals.
We’ll test you on all of the above next week!