Bearing structure with reduced vibratory level for railroad track

Abstract

A bearing structure for railroad track rails on a track bed, comprising several load distribution plates in a rigid material disposed side to side on the track bed, with each load distribution plate having a surface area and thickness predetermined in such a way that its first resonance frequency is greater than the first resonance frequency of the vibrations locally generated in the rails by the passage of the wheels of a vehicle on the rails. The different load distribution plates may advantageously be interconnected by joints allowing the pivoting of each load distribution plate with relation to adjacent load distribution plates. The load distribution plates may be placed on the ground of the track bed or on the foundation of a tunnel and they may also be integrated in the coating of a railroad way. The load distribution plates may bear rails of the railway track, switches and crossings, fixation systems on which the rails may be fixed or even ballast that itself bears cross ties on which the rails of the railway track are fixed.

1 . A bearing structure for railroad track rails on a track bed, comprising several load distribution plates in a rigid material disposed side by side on the track bed, under the railroad track, each load distribution plate having a surface area and thickness predetermined in such a way that its first resonance frequency is greater than the first resonance frequency of the vibrations locally generated in the rails by the passage of the wheels of a vehicle transiting on the rails. 
   
   
       2 . The railroad track rail bearing structure as claimed in  claim 1 , in which the load distribution plates are interconnected by joints allowing pivoting of each load distribution plate with relation to adjacent load distribution plates. 
   
   
       3 . The railroad track rail bearing structure as claimed in  claim 1 , in which each load distribution plate has its first resonance frequency greater than 1.4 times the first resonance frequency of the vibrations locally generated in the rails by the passage of the wheels of a vehicle transiting on the rails. 
   
   
       4 . The railroad track rail bearing structure as claimed in  claim 1 , in which each load distribution plate is placed on the ground of the track bed. 
   
   
       5 . The railroad track rail bearing structure as claimed in  claim 1 , in which each load distribution plate is placed on the foundation of a tunnel. 
   
   
       6 . The railroad track rail bearing structure as claimed in  claim 1 , in which each load distribution plate is integrated in the roadway pavement. 
   
   
       7 . The railroad track rail bearing structure as claimed in  claim 1 , in which at least one load distribution plate is placed under switches and crossings. 
   
   
       8 . The railroad track rail bearing structure as claimed in  claim 1 , in which each load distribution plate comprises grooves to receive the rails of the railroad track. 
   
   
       9 . The railroad track rail bearing structure as claimed in  claim 1 , in which at least one load distribution plate bears ballast that itself bears cross ties on which the rails are fixed. 
   
   
       10 . The railroad track rail bearing structure as claimed in  claim 1 , in which at least one load distribution plate bears fixation systems on which the rails are fixed. 
   
   
       11 . The railroad track rail bearing structure as claimed in  claim 1 , in which each load distribution plate is made in the form of a beam. 
   
   
       12 . The railroad track rail bearing structure as claimed in  claim 1 , in which at least one load distribution plate comprises lateral sides extending to the bottom of the plate. 
   
   
       13 . The railroad track rail bearing structure as claimed in  claim 11 , in which at least one load distribution plate furthermore comprises at least one longitudinal rib. 
   
   
       14 . The railroad track rail bearing structure as claimed in  claim 12 , in which at least one load distribution plate furthermore comprises at least one longitudinal rib.