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From fixed to flexible.
The crane rail attachment.

Rail attachments have to perform two tasks: firstly, they must hold the rails securely on the rail support; secondly they should deflect the horizontal and vertical forces optimally. There is a choice of four attachment types for this purpose:

  • Guiding, laterally adjustable rail attachment systems consist of a guide plate that makes contact with the rail foot at the same time as with the guide projection on the rail foot, as well as a pressure plate by means of which the system is bolted onto the rail support in a laterally adjustable arrangement. Clamping of the rail foot is avoided by coordinating the intermediate layer thickness and the rail foot thickness with the height of the guide projection. The push-through of the rail does not have any detrimental effect on the bolts of the attachment systems. Zero-play guidance of the rails by means of guide plates in contact with them means that the clamping can be dispensed with. These conditions are met by the MX and MXA fastening systems.
  • Clamping, laterally adjustable rail attachments are secured by means of clamping plates that are exchangeable and laterally adjustable. The position of rails secured in this way can be corrected straightforwardly. Clamping the rail foot prevents a change in length by the rail, e.g. due to temperature fluctuations. The forces arising as a result are absorbed by the bolts of the rail attachments.
  • Rigid, releasable rail attachments are achieved by exchangeable clamping plates. This design is more complex than the previous one. Position corrections can only be achieved in the course of a complete renovation.
  • Rigid, non-releasable rail attachments are achieved by welding the rails onto a steel structure. This design is very inexpensive but suffers from the drawback that dynamic forces can destroy the welded connection. As a rule, repair work is required at an early stage and can only be carried out with high complexity. Position corrections can only be achieved in the course of a complete renovation.