When a crane travels along the runway its dynamic motion creates both a vertical and a lateral force that needs to be managed in a manner that is not damaging to the building and crane runway.

These rolling load forces are transmitted through the crane rail directly to the crane girder and from the rail clips to the crane girder. From this point, these forces need to be transmitted efficiently from the girder and into the building column.

Rigid tie-backs made from angle iron or channel steel cannot accommodate the girder-end rotation, as a result of the girder being loaded and the top flange compressing. The bolts used to secure the rigid tie-backs are in shear and will fatigue and eventually fail in operation—as will the welds used to secure the rigid tie-backs.

The use of thicker steel or creating an otherwise robust but still rigid, fabricated steel tie-back, will simply transfer the damaging forces to another location and the problem will migrate to that location eventually.

Atlantic Track manages these forces effectively with an engineered mechanical link assembly, complete with a spherical bearing. The rotation of the spherical bearing can accommodate significantly more rotational movement than a traditional, stiff and rigid tie-back assembly.

The Atlantic Track Crane Runway Division can assist you. We do require your participation in filling out the required informational request forms so that we may assist you in the best possible fashion.