Media tunnel of reinforced-concrete frames jacked below the A 1 expressway near Hagen, Germany

Figure: Kleihues

At kilometer 343.15 near Exit Hagen-Nord, the media tunnel crosses below the A1 expressway

Figure: Kleihues

The abutment in the form of a concrete surface continues to be of use for the tunnel

Figure: Kleihues

Figure: Vortriebstechnik Weiss

The rectangular cross-sections weighing approx. 30 tons are jacked through underneath the expressway

Figure: Vortriebstechnik Weiss

Figure: Kleihues

The media tunnel consists of 23 individual rectangular precast concrete segments from the concrete plant Kleihues in Emsbüren, Germany

Figure: Kleihues

View of the southern side of the tunnel

Figure: Kleihues

Figure: Vortriebstechnik Weiss

Extraction of the in-situ soil took place by mini-excavator, which loosened the material and deposited it on a conveyor belt

Figure: Vortriebstechnik Weiss

Figure: I-KIS

The precast segments were jacked by VTW Vortriebstechnik Weiss GmbH from Hünxe, Germany, using a jacking system

Figure: I-KIS

Breakthrough achieved: For the southern reception pit, part of the retaining wall had to go

Figure: I-KIS

In recent years, trenchless pipe jacking of reinforced-concrete pipes has reached an advanced technical level, as a result of international research and development work. One of the latest project involves the new construction of a media tunnel in Hagen, Germany, which the precast plant Betonwerk Kleinhues of Emsbüren, Germany, jacked through the A1 federal expressway embankment.

In recent years, trenchless jacking of reinforced-concrete pipes has reached an advanced technical level, as a result of international research and development work. Today, it is a field-tested alternative to open-cut construction. Until now, however, circular pipes have been primarily used for this purpose, although many applications preferably specify rectangular structural components. The company Vortriebstechnik Weiss GmbH has for some time been using a method that enables jacking of rectangular cross-sections as well. The new construction of a media tunnel in Hagen, Germany, is the most...