English to Norwegian Tech/Engineering Engineering (general)

It’s a kind of crane specialized in bridge construction.

"The launching girder is particularly suited to the construction of ribbed slabs, and it causes fewer problems during the launching operations. The girders are usually supported on temporary bearings mounted on brackets at the piers, with one beam located beneath each side cantilever. The head of the pier often has a cut-away portion to allow passage of the central beams. Alternatively, these central beams may be moved transversely prior to launching.”

“Due to its low position, a launching girder will generally be heavier than a launching gantry, although this will be partially offset by the fact that the formwork will contribute to the bending strength of the supporting members.”