Clean Material Separation: Breaking out the Temporary Top Heading Invert in the Trimberg Tunnel

Excavating the Trimberg Tunnel for the new motorway A44 Kassel – Herleshausen in Germany, the tunnellers encountered difficult geology and had to install a temporary top heading invert of shotcrete. To break out the invert, a Kemroc DMW 130 cutter wheel mounted on a 23 t excavator was used. The shotcrete was cleanly separated from the ground below and recycled as a valuable construction material

Numerous structures make the new building of the motorway A44, a link between the motorways A7 at Kassel and the A4 at Herleshausen in a west-east direction, a challenging infrastructure project. These include the two tubes of the 600 m long Trimberg Tunnel, which was started in 2016 and is mostly being mined. In both tubes of the tunnel, the miners from the joint venture Hochtief/Züblin are faced with difficult geological conditions: settlement and loosened rock occur along a length of 250 m in the Bunter sandstone. Therefore the client DEGES provided a temporary top heading invert of...

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