DK3030718T3 - PROCEDURE FOR STAMPING A TRACK - Google Patents

Description

DESCRIPTION

The invention relates to a method of tamping a track, wherein the track is initially surveyed - independently of a tamping machine - by recording a number of track parameters, the determined actual position data are processed in a software program and finally used as target position data for controlling the tamping machine for an optimization of the track position.

In a method of tamping a track known from US 6 311 624, during a first forward motion of the machine, relative displacements between two measuring reference points are registered while thus forming an actual position curve of the track. Subsequently, a target position curve of the track is calculated from the actual position curve, thus forming correction values. During a second forward motion of the machine, while registering the relative displacements between the two measuring reference points, the track is lifted and tamped into the target position according to the correction values determined. EP 0 520 342 A1 discloses a measuring vehicle for determining the actual track position with reference to the target track position. An independently mobile satellite wagon is associated with said vehicle. Correction values are transmitted by radio to a tamping machine and processed there for controlling a track lifting- and lining unit. A method and a device for recording the condition of track systems, in particular switches, is known from WO 2005/098352 A1. In this, actual profile data are compared with target profile data.

It is the object of the present invention to create a method of the type mentioned at the beginning with which a simplified tamping of a track is possible.

According to the invention, this object is achieved with a method of the specified kind in that, for a corresponding allocation of the target position data to actual position data determined by the tamping machine during the track tamping, a position synchronization with regard to at least one track parameter is performed.

Owing to this data transfer, a separate measuring run of the tamping machine advantageously becomes unnecessary, so that the tamping operations can be finished more quickly. Utilizing, for example, the data for the gauge measurement enables a problem-free and precise position synchronisation of the data recorded by a measuring vehicle with the actual position data of the track detected by the tamping machine.

Additional advantages of the invention become apparent from the dependent claim and the drawing description.

The invention will be described in more detail below with reference to an embodiment represented in the drawing in which Fig. 1 shows a side view of a tamping machine, Figs. 2 and 3 show measuring data of a gauge of the track before and after a position synchronisation. A tamping machine 1 shown in Fig. 1 has a machine frame 3 supported on on-track undercarriages 2 and is mobile by means of a motive drive 4 on a track 6 formed of sleepers and rails 5. Provided for carrying out tamping operations are tamping units 8, vertically adjustable by drives 7, and a lifting- and lining unit 9. A central computing- and storage unit 11 for processing track data is located in a driver's- or work cab 10.

For recording track position faults, a track position measuring system 12 is provided which is essentially composed of a laser transmitter 13, a measuring line 14 formed by a light beam, a receiver 15, and a control unit 16. The measuring line 14 is defined by a first measuring reference point, formed by the emission of the light beam, and a second measuring reference point constituted by the contact with the receiver 15.

The conventional procedure of the method for recording the track position data, as known heretofore from the prior art, will be described below in more detail. After passing over the track section to be corrected, a front trolley 17 is detached from the machine 1 and set down on the track 6. Subsequently, the machine 1 travels back - opposite to the working direction represented by an arrow 18 - until the machine 1 comes to rest on a track section which is not to be corrected any more. A tracing member immediately preceding the tamping unit 8 is set onto the track 6 and pressed against a rail 5 serving as reference rail. After that, the laser transmitter 13 is aimed preferably at the center of the receiver 15 and fixed in its position relative to the front trolley 17.

During the measuring run, starting now, of the machine 1 in the direction toward the front trolley 17, relative displacements in accordance with the track position faults take place between the stationary measuring line 14 and the receiver 15. These relative displacements are stored in the computing- and storage unit 13 in connection with a path measurement by means of a path measuring device. While the tamping machine 1 is returned again to the beginning of the track section to be corrected, a target position curve is formed by the computing unit 11 on the basis of the measured actual position curve, and the corresponding correction values are determined. Thereafter, the working forward run for track position correction begins.

In comparison to this known method, the method according to the invention as described below makes it possible to achieve a simplification of the track tamping operation.

Generally, tracks are travelled over at regular intervals by means of a special measuring vehicle in order to record various track parameters in the process. The stored data are analysed automatically with regard to their deviation from target data and finally serve as a basis for track position correction work which may have to be carried out.

With the method according to the invention, it is now possible to transmit the data, originally stemming from the measuring vehicle and determined after an analysing process, to the computing unit 11 of the tamping machine 1 as target position data of the track. However, in order to meaningfully correlate the data, a position synchronization has to be performed by an appropriate software, so that in the end the transferred data correspond locally to the actual position data of the track recorded by the tamping machine.

The position synchronization takes place with the aid of an appropriate track parameter functioning quasi as a finger print of the track. In the example shown in Figs. 2 and 3, this is, on the one hand, the gauge of the track 6, recorded by the measuring vehicle and represented as a dotted line, and, on the other hand, the gauge detected by the tamping machine and shown as a solid line. However, other parameters can also be used for position synchronization, such as, for example, the longitudinal level of the track, but also measuring data of the catenary.

In principle, various mathematical methods are available for position synchronization of the data. By means of covariance or the minimum procedure (here, the sum of the square difference deviation of two signals or also the sum of the absolute difference deviations of two signals is calculated) it is possible to synchronize different measuring signals (different points in time of measuring, different data sources).

After position synchronization has taken place, the target position data fed into the computing- and storing unit 11 are compared to the actual position data measured by the tamping machine, and correction values resulting from the difference are used for controlling the tamping machine or the lifting-and lining units thereof for the tamping of the track. Thus, a separate measuring run of the tamping machine immediately prior to track tamping, as described with regard to the prior art, is not necessary.

Claims (2)

1. A method of stamping a track, initially measured independently of a stamping machine (1) by recording a number of track parameters, the recorded data for the actual location is analyzed in a software program and finally used as data for a desired location for controlling the stamping machine (1) for optimizing the position of the track, characterized in that a corresponding allocation of data for the desired location to the data recorded by the stamping machine (1) during the stamping of the track is carried out a location synchronization of at least one trace parameter. Method according to claim 1, characterized in that the recorded data for a track width on the track (6) is used for the location synchronization.