Cologne resident had to have this experience at his place of residence. His front door was barricaded, apparently to protect the glass.
Fortunately, the fire department could be relied on to remove the barricade. The fire department professionally sawed the structure into pieces, writes the user. The city of Cologne is in a state of emergency at Carnival, with a curfew for all residents of the city and the surrounding area. The protective walls are not installed by the city, but by the respective house owners.