MILLING LIMESTONE BLOCKS TO SIZE
Using a KEMROC ES 60 universal cutter where precision is required
Construction of the new A44 autobahn from Kassel to Herleshausen (Germany) is forging ahead. Located along the route of the autobahn, the steep walls of the Trimberg Tunnel portals are supported with shotcrete faced with massive blocks of Jurassic limestone. In total, around 9,000 blocks are required and each one must be milled to size within very tight tolerances. A KEMROC ES 60 HD universal cutter mounted on a wheeled excavator is used for final adjustments to the block dimensions.
At around 600 m long, the Trimberg Tunnel is just one of numerous construction projects that were required when building the new A44 autobahn between Kassel and Herleshausen (Germany). After breaking through in each of the twin tunnels, work commenced on the interior lining and supporting the steep, shotcreted portal walls with a cladding made from Jurassic limestone blocks. The main contractor, ARGE HOCHTIEF / ZÜBLIN on behalf of their client, the project management company DEGES, subcontracted the Bad Hersfeld branch of STRABAG to clad both portal walls, each about 500 m long and up to 10 m high with blocks of Jurassic limestone. Each of the 90 – 180 cm long and 50 – 90 cm high limestone blocks were delivered to site by truck and then trimmed to precisely the correct length. This was the only way that the contractor could meet the joint dimensions specified by the client …