Shocks due to blasts to demolition of bridges of highways

In connection with the reconstruction of the „Bundesautobahn” it is necessary to destroy old bridges and build new. Because of the short-time necessary stoppage of the roads is the demolition with a blast a favorable method. At bridges over roads and railways takes place the demolition often in two steps with the sequence, that one part of bridge by the vibrations from blasts will be charged with dynamical stresses. With the first destruction is this the old part of bridge, by the second destruction the new constructed part of bridge. At the example of three blasts is shown, how the vibrations from blasting on the construction of bridge act and what kind of specialties appear.