A continuous base plate is placed on the concrete base. The base plate shall have dimensions appropriate to the type of rails and the Valex fastening system selected. According to the type of Valex fastening system selected, for the indirect system, on the base plate, the basis of the fastening system shall be welded.
For the direct system, holes for inserting the ﬁxing screws shall be drilled. Distance between each fastening system could vary from 500 to 800 mm according the capacity of the crane. The base plate is ﬁ xed to the concrete base with foundation bolts which, when a direct fastening system is used, are
generally used also for the fastening systems of the rails.
The foundation bolts could be of different types: expansion, chemicals, umbrella, dove tail, and so on, according to the speciﬁc requirements.
The base plate position is then regulated with the levelling bolt. The length of each section of the base plate is normally around 6000 mm. Width and thickness, generally between 20 to 30 mm, are function of the capacity of the crane, of the type of concrete, of the fastening system and of the speciﬁc working conditions.
On the base plate the Valex I or Valex IT pad shall be placed. Then the rails and the fastening systems are placed following the technical instructions provided. When the placing of the fastening system is completed, the place under the base plate shall be ﬁ lled with concrete, special resins or self-levelling grouts.
The placing of crane rails on a steel base presents problems and costs signiﬁcantly lower than placing on a concrete base. The main decisions are whether to use the Valex I or Valex IT pad, with all the related advantages, and the type of Valex fastening system, direct or indirect, to be used.
Valex fastening systems for elastic fastening of rails on a steel base both for direct and, or indirect fastening, guarantee in any situation the best and most reliable results.
Generally indirect fastening allows a faster placing since, before putting in place pad and rails, the bases of the fastening system selected are welded to the supporting steel structure, such an operation is normally carried out in a short time, and in easier working environment.
Direct fixing requires drilling holes on the supporting steel structure, which generally takes longer.
The Valex fastening systems available for the two alternatives fixing possibilities are extensively tested and extremely reliable.
The final choice is generally a subjective decision.