Abstract: A connection assembly for connecting guide rails to the flange of a load carrying member includes clamping elements and bolt members in-connection with the T-shaped groove of the flange of the load carrying member and the guide rails for securing the guide rails to the flange. The flange includes flange parts inwhich each further includes clamping surfaces separated by an indent which is not in abutment with the respective guide rails when the clamping surfaces are in engagement with the respective guide rail. The connection assembly further includes holding rails associating with the flange parts, the clamping elements and bolt members in a manner to sandwich the guide rails between the holding rails and the flange parts.