Abstract: There is provided a dismountable bridge with lane girders which are designed as framework beams with a triangular cross section, whereby lower chords run through the two lower corners, which are at the same level, and an upper chord runs through the upper corner. A roadway slab which forms the roadway of the bridge is placed on the upper chord and the upper chord is connected to the roadway slab in a non-positive manner with sheer strength.

Abstract: A dismountable bridge, having two track carriers which, viewed in the longitudinal direction of the bridge, are divided into several identical modules, in which case the two track carriers are each spanned by a vault and are suspended at the latter. The vaults are divided into several modules in the longitudinal direction of the bridge and are adapted in their modular division to the modular division of the track carriers. The vaults and the track carriers are equipped at their ends with end pieces. The modules of the vaults have mutually identical constructions and the end pieces of the vaults are connected in a torque-resistant manner with the end pieces of the respective track carriers. The end pieces are constructed such that they are capable of compensating the length differences between the track carriers and the vaults in the case of different bridge lengths.

Abstract: A collapsible bridge and laying method for a collapsible bridge where bridge girders are pushed over an obstacle by way of a laying beam positioned in front of the obstacle to be bridged. Rollers and roller carriers carrying the rollers are fastened to the bridge girders, the rollers running in rails arranged on the laying beam. During the laying operation, the rollers with the pertaining roller carrier leaving the rail of the laying beam are removed from the bridge girder and are mounted again at a different point of the bridge girder which is momentarily situated in front of the entry into the rail of the laying beam. This process of using and removing the rollers from the bridge girder is repeated during laying of the bridge. The bridge girder can include a plurality of detachably connectible bridge girder sections.

Abstract: A dismountable bridge, having two track carriers which, viewed in the longitudinal direction of the bridge, are divided into several identical modules, in which case the two track carriers are each spanned by a vault and are suspended at the latter. The vaults are divided into several modules in the longitudinal direction of the bridge and are adapted in their modular division to the modular division of the track carriers. The vaults and the track carriers are equipped at their ends with end pieces. The modules of the vaults have mutually identical constructions and the end pieces of the vaults are connected in a torque-resistant manner with the end pieces of the respective track carriers. The end pieces are constructed such that they are capable of compensating the length differences between the track carriers and the vaults in the case of different bridge lengths.

Abstract: A collapsible bridge and laying method for a collapsible bridge is provided where bridge girders are pushed over an obstacle by way of a laying beam positioned in front of the obstacle to be bridged. Rollers and roller carriers carrying the rollers are fastened to the bridge girders, the rollers running in rails arranged on the laying beam. During the laying operation, the rollers with the pertaining roller carrier leaving the rail of the laying beam are removed from the bridge girder and are mounted again at a different point of the bridge girder which is momentarily situated in front of the entry into the rail of the laying beam. This process of using and removing the rollers from the bridge girder is repeated during laying of the bridge. The bridge girder can include a plurality of detachably connectible bridge girder sections.

Abstract: The invention relates to a service life indicator for monitoring structures, such as pioneering bridges, which are designed with a limited fatigue strength and whose service life is therefore limited. A service life indicator for monitoring structures, such as pioneering bridges designed with a limited fatigue strength and consequently limited service life, is provided. The service life indicator includes a strip of material as a test piece, having at least one hole arranged off-center in the test piece and a notch extending from an edge of the hole in a direction of an edge of the test piece for determining material fatigue. The notch extends to a nearest edge of the test piece and includes two mutually opposite grooves having the same cross-sectional shape that can be one of round, elliptical, oval, v-shaped and trapezoidal in cross-section.