Method and system for correcting vertical position defects of a track

Abstract

The invention relates to a method for correcting vertical position defects of a track after a lifting-tamping process, with a stabilizing process carried out by means of a dynamic track stabilizer in which a stabilizing unit acts on the track at a forward-moving working point in a working direction, with track position data of the untreated track being recorded before the lifting-tamping process, and with track position data of the tamped track being recorded after the lifting-tamping process at a measuring point located in front of the stabilizing unit in the working direction. In this case, additional track position data of the stabilized track are recorded at an post-measuring point located behind the stabilizing unit in the working direction, with the dynamic track stabilizer being actuated during the stabilizing process as a function of track position data of the untreated and the tamped track at the working point and of track position data of the stabilized track at the post-measuring point. The additional post-measurement of the track position after the stabilizing process enables precise control of the dynamic track stabilizer.

1 . A method for correcting vertical position defects of a track after a lifting-tamping process, with a stabilizing process carried out by means of a dynamic track stabilizer in which a stabilizing unit acts on the track at a forward-moving working point in a working direction, with track position data of the untreated track being recorded before the lifting-tamping process, and with track position data of the tamped track being recorded after the lifting-tamping process at a measuring point located in front of the stabilizing unit in the working direction, wherein additional track position data of the stabilized track are recorded at a post-measuring point located behind the stabilizing unit in the working direction, and that the dynamic track stabilizer is actuated during the stabilizing process as a function of track position data of the untreated and the tamped track at the working point and of track position data of the stabilized track at the post-measuring point. 
     
     
         2 . A The method according to  claim 1 , wherein track position data of a target position of the track are predefined, and that the dynamic track stabilizer is additionally actuated during the stabilizing process as a function of correction data which are derived for the working point from the data of the target position and the track position data of the untreated track. 
     
     
         3 . The method according to  claim 1 , wherein a longitudinal gradient or longitudinal level and a crossfall or superelevation of the track are each measured at the respective measuring point to record the track position data. 
     
     
         4 . The method according to  claim 1 , wherein at least one of the following operating parameters of the dynamic track stabilizer is changed during the stabilizing process as a function of the recorded track position data:
 a vibration frequency,   a travelling speed (V dgs ),   an imposed load acting on a left rail (al dgs ),   an imposed load acting on a right rail (ar dgs ),   a total imposed load.   
     
     
         5 . The method according to  claim 4 , wherein the stabilizing process is started with an output value of the respective operating parameter, and that an adjusted value is continuously calculated for the respective operating parameter during the stabilizing process by means of an algorithm set up in a computing unit. 
     
     
         6 . The method according to  claim 5 , wherein weighting factors are stored in the algorithm for the respective operating parameter, and that the weighting factors are continuously adjusted by means of a control. 
     
     
         7 . The method according to  claim 1 , wherein a track position measuring system comprising a plurality of measuring devices is carried along with the dynamic track stabilizer, and that the corresponding track position with respect to a common reference system is recorded at the respective measuring point by means of the assigned measuring devices. 
     
     
         8 . The method according to  claim 7 , wherein the reference system is formed by means of a camera attached to one of the measuring devices and a reference mark attached to another measuring device and positioned in a recording area of the camera, and that measuring marks attached to the remaining measuring devices are recorded by means of the camera in order to record the track position data. 
     
     
         9 . A system for carrying out a method according to  claim 1 , having a track position measuring system and having a dynamic track stabilizer for correcting vertical position defects at a forward-moving working point of a track, wherein the track position measuring system is set up to record the track position at a measuring point arranged in front of the dynamic track stabilizer in the working direction and at a post-measuring point arranged after the dynamic track stabilizer in the working direction, that the dynamic track stabilizer comprises a control device to which track position data recorded by means of the track position measuring system are fed, and that the control device is set up to actuate the dynamic track stabilizer as a function of track position data assigned to the working point and the post-measuring point. 
     
     
         10 . The system according to claim  10 , wherein a distance between the working point and the post-measuring point lies in a range between 3 m and 10 m, particularly between 5 m and 8 m. 
     
     
         11 . The system according to  claim 10 , wherein the control device comprises a computing unit in which an algorithm is implemented for recalculating at least one operating parameter of the dynamic track stabilizer on the basis of continuously updated track position data. 
     
     
         12 . The system according to  claim 9 , wherein a stabilizing unit comprises a vibration generator and roller clamps that can be clamped onto rails of the track and is supported against a machine frame with imposed load drives that can be actuated separately. 
     
     
         13 . The system according to  claim 9 , wherein a tamping machine is arranged immediately in front of the track stabilizer in the working direction, and that the track position measuring system comprises at least one measuring device which is assigned to the tamping machine. 
     
     
         14 . The system according to  claim 9 , wherein a camera is attached to a first measuring device, that a reference mark is attached to a second measuring device, and that at least one further measuring device with a measuring mark is attached between the first and second measuring device. 
     
     
         15 . The system according to  claim 14 , wherein the track position measuring system comprises a flash lamp that can be actuated together with the camera.