Rolling mill frames

In a rolling mill frame with composite stands each stand has a lower and an upper stand part. The stand parts are connected together by a pair of tie rods, both ends of each tie rod being supported on the lower and upper stand parts in a stress transmitting manner. The upper stand part can be displaced to permit rolls supported in the mill frame to be changed. Each tie rod is releasable by means of a bayonet type fast engagement connection and each such connection is disposed adjacent a separation point of one of the stand parts.