IMPROVEMENTS IN OR RELATING TO APPARATUS FOR THE CONSTRUCTION OF BRIDGES

摘要

Apparatus for the construction of bridges incorporating piers pivoted to a transverse structure which may be an integral part of a bridge span or a cross-beam on which a span is supported. The piers can pivot in a plane transverse to the bridge and are normally maintained at a predetermined angle to the transverse structure by hydraulic articulators connected to piers and transverse structure across the angle therebetween. The articulators incorporate a valve actuable when the articulators are subjected to a predetermined load to permit a change of length of the articulator and a consequent variation of the angle between piers and transverse structure and thus to relieve excessive stresses on the bridge structure.