Within a short time the experts from Euro Alliance Construction JSC assembled a temporary steel construction in Stuttgart, south Germany.
At the moment Stuttgart is the city with the most infrastructure construction activity in Germany. Beside the mega project Stuttgart 21 (S21) there are many parallel projects which do not directly belong but influence S21. One of them is the extension of city tram line № 12.
As the site is located it the urban city area, the excavation pit in the direct portal area had to be covered prior to the excavation works start. This temporary overhead cover consists of steel H-beams, wooden timbers and sandwich panels. The aim is noise reduction for the residents in the period of tunnel excavation, especially at nights.  
The most challenging problem was the extremely tight time schedule, as not much time until excavation start has left. Many simultaneous activities of all project participants on site demanded permanent coordination among all actors.