Germany's biggest airport uses Krah pipes
The construction work for the expansion of Germany's largest commercial airport is in full swing - and FRANK pipes are being used underground to transport the surface water away on the new south apron.
In the south of the airport, Terminal 3 and the associated southern apron with the parking positions for the aircraft (ramps) are being built on the areas of the former US military base.
Prior to the tendering phase, the airport operator had opted for a tightly welded pipe system made of homogeneous solid wall pipe according to DIN 8074/8075 with an inspection-friendly inner surface.
After several discussions with the responsible planning office, our profiled sewer pipe system (PKS) was approved as an alternative to the tendered system due to its technical advantages (easy handling due to integrated electrofusion socket, low weight and larger internal diameter) - and finally also awarded the contract.
Pipe material and production
The production of the wound PKS sewer pipes made of PE 100 took place at FRANK Kunststofftechnik GmbH in Wölfersheim, Hessen. Polyethylene (PE 100) is a thermoplastic which, in addition to its low specific weight, also exhibits excellent processability, weldability and formability. Polyethylene is particularly resistant to aggressive media (acids and alkalis). Furthermore, the molecular structure of the material, which is composed of carbon and hydrogen, enables material recycling. Polyethylene is 100% recyclable.
The PE 100 moulding compound is wound onto a metal drum in a spiral as a continuous, overlapping strip in the molten state.
For the static design of the pipes, the load diagrams of the A380-800 and A340-600 design aircraft had to be used. These were taken into account in the static design. For each DN and load case, static calculations according to ATV A 127 were prepared and the critical load cases were made available to the AG in a tested form.
Due to the high requirements, a PKS-plus profile was used, which is specially designed for very high external loads.
PKS® profile type PKS®plus (DN 300 to DN 3500)
PKS® profiles of the type PKS®plus achieve very high long-term ring stiffness due to the compact profile structure with smooth and closed pipe outside. They are therefore used for very high external loads. Due to the smooth outer wall of the pipes, they are ideally suited for the construction of shafts and other structures with pipe penetrations. The PKS® pipes of this type can be adapted to the respective ring stiffness requirements or the basic wall thickness can be determined according to customer requirements. The individual pipes can be joined up to DN 2400 using electrofusion welding. Extrusion welding can be used from DN 300 to DN 3500, whereby the pipes are manufactured with spigot ends and sleeves as standard, as with the PR profile type.
Welded PKS pipes were used in this project. In the PKS® pipe system (profile duct pipe system), the individual pipes (but also manholes / components) are welded as standard with the integrated heating coil sleeve (E sleeve) - this connection technology is available up to DN 2400. During the manufacturing process, the socket and spigot end are formed onto the pipe. During installation on site, the spigot end is inserted into the socket and then welded. The welding parameters are transferred to the welding machine via a barcode. The welding machine automatically records the welding process.
Scope of delivery
- • 240 m PKS sewer pipe DN 400
• 90 m PKS sewer pipe DN 500
• 190 m PKS sewer pipe DN 700
• 390 m PKS sewer pipe DN 800
• 180 m PKS sewer pipe DN 900
• 480 m PKS sewer pipe DN 1000
• 40 m PKS sewer pipe DN 1100
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