TUNNEL DOOR WITH CONCRETE CORE REVOLUTIONIZES TUNNEL SAFETY

Kirchdorfer Group, Elkuch Group and Biprotec GmbH revolutionize the safety of rescue doors in tunnel construction. A concrete core in the tunnel door reduces deformation in the event of fire and increases fatigue strength – the durability under alternating pressure and suction loads.

The door panels with a concrete core are produced by Kirchdorfer Concrete Solutions, the precast concrete division of the Kirchdorfer Group, and completed by Elkuch to form a complex tunnel door with a frame. They will be used for the first time in the Great Belt Tunnel (Slagelse – Nyborg), where the first 60 double-leaf tunnel doors will be installed in summer 2023.

The seals are an important prerequisite for preventing burning or smoking through into the safe rescue tunnel in the event of a fire. These remain intact for longer thanks to the reduced deformation of the innovative solution with concrete core! Previous tests have confirmed a fire resistance classification ofEI2120. This value confirms that the room closure (E) and thermal insulation (I) are still fulfilled at 1050°C and a dwell time of 120 minutes. Gerhard Rinnhofer, F&E Kirchdorfer Concrete Solutions, assumes that “the limits have by no means been reached here.“

Biprotec Managing Director Robert Binder “sees the durability in terms of corrosion as a further advantage of the tunnel door with concrete core developed together with Kirchdorfer Concrete Solutions.”

Tunnel door with concrete core
The tunnel door with concrete core has withstood previous tests at 1050°C
for 120 minutes without any problems (=EI2120).
© Kirchdorfer Group

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