Wayss & Freytag Ingenieurbau AG is one of Germany’s leading construction companies. The main focus of its activities lies in the German civil engineering and international tunnelling markets. On the international market, the company carries out projects in which it distinguishes itself by its special know-how and excellent performance. The scope of our activities ranges from mechanized and conventional tunnelling, the construction of sewage treatment plants and power plants, railway, bridge and stadium construction and industrial construction to environmental technology. Engineering consulting, location analyses, utilization concepts and feasibility studies complete our range of services.
In the past Wayss & Freytag was significantly involved in the development of mechanized tunnelling techniques. Wayss & Freytag is a pioneer of the slurry shield technique and has in the meantime driven more than 150 km of tunnel using slurry shields. In addition, more than 80 km of tunnel were driven using earth pressure balance shields and 30 km using hard rock TBMs.
The scope of our activities ranges from mechanized and conventional tunnelling. Mechanised tunnelling, Cut-and-Cover Tunnels, Retained Cuts, Tunnel refurbishment, Tunnelling Technologies. Our services are based on the experience gained on over 200 km of tunnels, driven using tunnel boring machines (TBMs) operated in slurry shield, earth pressure balance (EPB) and hard rock mode.
For example, they initiated the support of the tunnel face by means of a bentonite suspension and air-cushion. With the so-called "slurry shield" this technique was brought to operational maturity. Wayss & Freytag is a pioneer of this technique and has in the meantime driven more than 150 km of tunnel using slurry shields. In addition, more than 80 km of tunnel were driven using earth pressure balance shields and 30 km using hard rock TBMs.
Sewerage Tunnel Emscher
Construction of 130 excavation pits, 115 shaft structures and approx. 47 km of sewerage tunnel in 117 individual drives with individual lengths of < 20 m to 1.150 m. 2800 with 9 full-face TBMs using both the EPB- and slurry method. Crossing beneath waterways (Emscher Canal, Rhein-Herne- Canal), railway lines, roads, dams, buildings and pipelines. Standard pipe length 4 m. Thickness of pipe walls between 21 cm and 39 cm.
New Central Services Tunnel for Brunsbüttel Lock
Construction of a services tunnel (called “Mitteldüker”) under the existing double locks at the western end of the Kiel Canal without disrupting lock operations, length: approx. 450 m, clear internal diameter: 2.20 m, tunnel invert approx. 35 m below ground Level Pipe jacking using an AVN 2000 machine, construction of shafts using the diaphragm wall method.
New Coal-Fired Power Plant in Wilhelmshaven, Cooling Water Pipelines
4 cooling water pipelines DN 3400 with a length of 300 m each; 1 fish return pipeline DN 1200 with a length of 300 m; start shaft: 30 m x 25 m x 15 m, diaphragm walls with anchored underwater concrete slab; target shaft: 45 m x 11 m x 15 m, steel girder shoring with underwater concrete slab and pre-installed lean concrete block; dyke crossing structure: 5 circular cells of secant bored piles (internal diameter approx. 7 m), a tunnel drive through each circular cell.
Wayss & Freytag Ingenieurbau AG
Eschborner Landstr. 130-132
60489 Frankfurt am Main
Phone: +49 69 7929-0
Fax: +49 69 7929-122
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