EA041428B1 - TRACK MACHINE AND METHOD FOR RAIL TRACK LEVELING - Google Patents

Description

Technical field

The present invention relates to a movable device for correcting the height of a pre-measured track for a tamping machine with a measuring system that includes a movable cable as a basic system and with a lifting device for raising the track to a predetermined height predetermined by means of a movable cable at the working point. The invention also relates to a corresponding method.

State of the art

Changes in the position of the track, which occur forcibly due to loads on it during movement along the track, as well as due to natural influences, must be constantly corrected by carrying out repair work. As a rule, an appropriate device is used for raising the track to a predetermined height position. Such lifting processes are usually accompanied by lateral straightening, as well as tamping of the rail track. In this case, a preliminary measurement of the track is usually carried out in order to register erroneous positions and to be able to carry out an elevation of the track in order to carry out an absolute correction of the position of the track using the so-called precision method.

For example, such a tamping machine is known from AT 382410 B, in which a measuring cable (movable cable) that moves with the machine is provided as a basic system for each rail of the track. The position of the respective measuring cable in relation to the respective rail is determined by the front and rear measuring devices. In this case, the front measuring device is guided in the not yet corrected track area and the rear measuring device is guided in the already corrected track area. In this case, it is assumed that the track in the corrected zone is at a given level.

From patent AT 515208 B1, a device is known in which the machine frame serves as a virtual movable cable. At the same time, the measuring system is designed for non-contact probing of the corresponding rail and is connected to the machine frame without the possibility of changing its position relative to the vertical. Additionally, devices of the same type are also known which have optical movable cables, such as from US Pat. No. 3,107,168 A.

Various embodiments of the movable cable measurement principle are described, for example, in DE 102008062143 B3 or DE 11037976 A1. Methods are described in this connection, so that on the basis of the relative measurements made with the help of the movable cable, the obtained measurement signals, which are accurate in form, are determined for the vertical position of the track. Thus, the principle of measuring with a movable cable is applied for a precise pre-measurement of the track in terms of shape.

Brief description of the invention

The invention is based on the task of improving the device and method of the above type in comparison with the known prior art.

In accordance with the claimed invention, this problem is solved thanks to the independent claims 1 and 9 of the claims. Preferred embodiments of the invention are described in the dependent claims.

At the same time, the position of the movable cable is determined at two base points in relation to the uncorrected zone of the rail track, while the working point is located in the working direction of movement behind the base points. In this way, the position of the movable cable is set unambiguously and precisely at any time. Due to the preliminary measurement, the actual position of the track in the uncorrected area is known. Under no circumstances should it be assumed that the track in an already corrected area has assumed a predetermined height position. This improves, on the one hand, the accuracy of the lifting of the track and, on the other hand, makes it possible to quickly correct erroneous lifting processes. In particular, the accuracy of the absolute position of the track (relative to fixed points) is especially increased. In this way, the requirements prescribed in EN 13231 regarding the absolute quality of the track position after the tamping process can be met.

In a preferred embodiment of the movable device, it is provided that a control unit is installed to control the hoisting device and that a measurement signal is supplied to the control unit to correct the height position of the track at the operating point with the movable cable. This results in a simple structure for controlling the lifting device.

It is further advantageous if a switching device is installed to virtually lift the movable cable and/or the leveling sensor. This eliminates the need for mechanical leveling devices to guide the movable cable along a predetermined position along the height of the track. Instead, the lifting cable is lifted at the operating point virtually to raise the track to the corresponding predetermined height.

Preferably, the switching device is connected to a storage device in which the uncorrected track position is stored. The movable device is then equipped for self-adjustment of the rail track, in which case the data on the determination of the current position is compared. Alternatively, a synchronous pre-measurement can be carried out using a measuring device located in front and remote transmission of the values of the measured position.

In a simple embodiment of the invention, the movable cable is designed as a leveling cable stretched between two measuring carts. It is advisable to place the front measuring cart at the front reference point and the rear measuring cart at the working point to determine the rise of the track. The set height is then reached at the working point by direct alignment of the movable cable.

In another embodiment of the invention, it is provided that the movable cable is implemented as an optical axis between two measuring devices movable along the track. This facilitates the virtual lifting of the movable wire at base points. In addition, there are no inaccuracies as a result of mechanical tolerances.

To improve the device, a secondary measurement point is placed behind the operating point in the direction of the working movement to record the height position of the track at this point. At the same time, the measuring system includes four points for registering the position along the height of the rail track, while the front reference points determine the position of the movable cable. The operating point determines the rise of the track, and the rise process is checked at the secondary measurement point. By means of the fourth measurement at the point of the secondary measurement, in particular gross inconsistencies due to false measuring sensors (duplication) can be determined.

Preferably, each of the two rails of the track is assigned its own movable cable. In this way, both rails of the track are directly corrected. Elevations on curved sections of the track are set thanks to both movable cables with different lifts. Special consideration of the elevation values at the operating point is not required.

In this case, it turns out to be advantageous if a device for measuring the inclination is installed at the base points and at the operating point, respectively, in order to be able to use additional measurement signals for raising the track in the region of curved sections of the track and at transition arcs.

In the claimed method of correcting the rail track, it is provided that the movable cable is moved in the working direction along the rail track and at the same time it is virtually raised at the base points or with the help of leveling devices according to the corresponding predetermined heights and that the rail track is raised with the help of a lifting device at the working point to a height , set using a movable cable.

In another embodiment of the method, the measured values measured at the secondary measurement point are transmitted to the switching device, whereby the predetermined heights are matched using the switching device depending on these measured values. Thus, they react automatically to changes in the parameters of the rail track (for example, the properties of the crushed stone bed). Appearing residual errors are minimized due to the immediate adaptation to the given lifting values. The rise is set after that thanks to the interactive regulation.

In this case, it turns out to be preferable if the measured values registered at the secondary measurement point are accumulated in order to prepare a working protocol. Thus, immediately after the adjustment of the track, the documentation of the successfully completed work, necessary for the ready-to-use section of the track, is provided.

Brief description of the figures

The claimed invention is explained below in more detail on examples of its implementation with reference to the accompanying drawings.

In FIG. 1 shows a movable device according to the prior art;

in fig. 2 is a lifting diagram according to the prior art;

in fig. 3 shows a lifting process according to the prior art;

in fig. 4 shows a movable device with measuring points;

in fig. 5 shows a lifting process with a leveling cable and subsequent measurement;

in fig. 6 shows the lifting process with an optical axis;

in fig. 7 shows the lifting process with optical axis and secondary measurement;

in fig. 8 shows the process of lifting on the transitional arc;

in fig. 9 shows geometric relationships.

Description of embodiments of the invention

Shown in FIG. 1 device 1 tamping machine is known from the prior art. It is intended for correcting the height position 2 of the pre-measured track 3 and includes a measuring system 4, a lifting device 5 and a tamping unit 6. The uncorrected position 7 of the track 3 is known in this case on the basis of a preliminary measurement. In this case, for each point of the rail track 3, the desired target height 8 (target height curve along the track) is set, so that for each such point, the required lift is known. Specifically, the so-called lift correction values 9 are set.

The measuring system 4 uses the known three-point measuring system (moving cable measuring principle), while the front measuring cart 10 moves in the uncorrected zone 11 of the track 3. The rear measuring cart 12 moves in the corrected zone 13. Between the two measuring carts 10, 12 is pulled movable cable 14, while the corresponding position 2 along the height of the track 3 is transmitted using rod systems 15 to the movable cable 14. The middle measuring cart 16 is designed to adjust the rise of the rail track using the lifting cable 14.

In the case of such a known measurement system 3, it is assumed that the corrected position of the track corresponds exactly to the target value 8 desired at the corresponding location, as shown in FIG. 2. The trailing point 17 at the end of the rope must therefore always be at the correct level. Based on the actual height 18, the front point 19 of the cable is raised at this point by a predetermined corrected amount 9 of the rise. This is done either mechanically by means of a leveling device 20 or virtually by an equivalent change in the electrical base signal.

Thus, with the help of the movable cable 14, the lift 21 to be performed at the working point 22 is set. Specifically, with the help of the lifting device 5, the rail track is raised at this point 22 for so long until the leveling sensor 23 shows the reached level on the middle measuring cart 16.

In FIG. 3, it can be seen that such prior art assumptions lead to constant errors. In practice, the corrected position of the track often deviates only slightly from the respective target height. For example, despite the tamping of the track 3, it may be lowered as a result of the load on the rail running mechanism 24, as shown in FIG. 3.

In this case, the track curve 25 is shown as a solid line after one lifting step. The curve 26 that existed before the lifting step is shown with a dashed line. The thin line shows the pre-measured uncorrected position 7 of the track 3. Although the correct corrected value 9 is lifted at the front end point 19 of the rope, the movable rope 14 does not move in accordance with the predetermined heights 8. As a result, the movable rope 14 performs a slight lift 21, while this error is stored until the operating personnel agree on the corrected values of the lifting values 9 or until the error rings out punctually during the movement of the machine.

This drawback is prevented by means of a movable device 1, as shown for example in FIG. 4. In this case, the movable cable 14 is determined at two base points 27, 28 in its position relative to the uncorrected zone 11 of the rail track 3. In the working direction of movement 29, the operating point 22 is located behind the base points 27, 28. Optionally, a subsequent measuring device 30 to check the height position 2 in the corrected zone 13.

In the embodiment shown, the movable cable 14 is stretched between the front measuring cart 10 at the first reference point 27 and the rear measuring cart 12 at the working point 22. The front end point 19 of the cable is then raised by the corresponding value 9 of the corrected height. This takes place either mechanically by means of a leveling device 20 or preferably electronically by means of signal conditioning by means of a switching device 31. The switching device 31 is connected in this case to a storage device 32 in which data relating to the terrain or to the track with an uncorrected rail position 7 are stored. path 3 or corrected values 9 lifting. With the path measuring device 33, the path 35 traveled by the device 1 relative to a fixed point is recorded. In this way, the distribution of the accumulated data is carried out with respect to the current base points 27, 28 as well as the current operating point 22 and, in this case, to the subsequent measuring point.

At the second reference point 28, the level of the movable rope 14 is compared with the target height 8 at point 28. This target height 8 is obtained from the known actual height 18 and from the corresponding corrected value of the lifting height 9 at this point 28. This correction takes place, for example, with leveling sensor 23, which is consistent with the leveling device 20 with a predetermined height. Preferably also in this case, as an alternative to mechanical leveling, electronic matching by means of a switching device 31 is provided.

As soon as registration is performed at the second base point 28, so that the movable cable 14 reaches the respective target height 8, the control unit 34 ends the lifting process. For this purpose, a signal from the leveling sensor 23 is sent to the control unit 34 provided for switching on the lifting device 5. In order to improve the accuracy, matching of the target heights can be carried out by means of a subsequent measurement.

- 3 041428

For this purpose, extend the movable cable 14 to the point 30 of the secondary measurement. For the measurement process, for example, a short release of the movable cable 14 at the operating point 22 is performed, so that the reference points 27, 28 and the secondary measurement point 30 are used for the three-point measurement. Alternatively, the movable cable 14 can then be stretched for a secondary measurement of the corrected position of the track.

In FIG. 5-8 show examples of curved heights along the rail 36 of the track 3 with the corresponding movable cable 14. In a simple and reliable solution, it is provided that a physically leveling cable (for example, a steel string) is pulled as a movable cable 14 between the measuring carts 10, 12 (Fig. . 5). Higher accuracy is achieved with the help of an optical axis between two measuring devices moving along the track (Fig. 7, 8). Such a solution is described, for example, in Austrian patent application A 325/2016. In FIG. 7, 8 shows the movable cable 14 as an optical axis in the form of a dash-dotted line.

On a straight section of the path is performed at the base points 17, 28 rise to the same specified height 8 (Fig. 5-7). As a result, the track 3 is forcibly lifted at the operating point 22 also up to this predetermined height 8. Optionally, a secondary measurement is carried out by means of a three-point measurement using the secondary measurement point 30 (FIGS. 5 and 7).

In FIG. 8 shows the situation when changing the inclination and on roundings. Such situations arise with elevations and changes in elevation. In this case, the lifting cable 14 is guided only at the first reference point 27 along the target height curve 8. At the second reference point 28, the lift is lifted by the corrected value of the lift amount 9, including the sag arrow 37, which at this point 28 is obtained based on the specified curvature of the target curve height in the longitudinal direction. The corresponding value is obtained in a simple manner on the basis of the predetermined curve of the predetermined height 8 and the length of the movable cable. Preferably, a switching device 31 is provided to carry out the corresponding calculations.

On curved sections of the path there is usually an elevation. At the same time, for the outer on the curved section of the track 3, the rail 36 is given a height 8, overestimated by the amount of elevation. This is correspondingly valid for the respective corrected amount of lift. For such a differentiated lift 21 of the rail track 3, for example, each rail 36 has its own movable cable 14.

Alternatively, or additionally, devices are provided for measuring the inclination 38 (pendulum) at the base points 27, 28 and at the working point 22. In this case, it is sufficient to set a given height 8 for the inner rail 36 along the arc. angle of inclination additionally by the corresponding amount of overestimation. In this case, one single movable cable 14 can be located in the center of the track and the height positions for the rails 36 are obtained taking into account the angle of inclination.

In FIG. 9 shows the geometric relationships for the following formulas. The machine moves in the working direction 29 along the track 3, which is measured at four points 22, 27, 28, 30 relative to the movable cable 14. The two front measuring axles still move along the track 3 in the original uncorrected zone 11. In this case, for a valid height 18 are known due to preliminary measurements of the corresponding values of the heights h _{0 real.} , hi _de ist _t . Between the movable cable 14 and the track 3 is obtained at the respective points 27, 28 the corresponding selective height Z ₀ , Z1. In this case, the values ho _set ., h1 _set . for the respective target height 8 or for the corrected lift value 9 as the corresponding delta height Aho, Ah1:

Lh given ^-h real

At operating point 22, i. e. in the track tamping position, the height position of the track 3 in the raised position is measured with the subsequent measuring axis. Specifically, the selective height z ₂ between the movable cable 14 and the track 3 is recorded in order to determine the value of the value of the height h ₂ at this point 22. At the secondary measurement point 30, the measurement of the selective height z ₃ between the movable cable 14 and the track is performed using the rear measuring axis. 3 in the padded corrected zone 13. In this case, the rise 21 is matched with the operating point 22 so that the value of the height h ₃ at this point 30 corresponds to the predetermined value. In this way, the elevation of the track is constantly rechecked and can be adjusted by means of a secondary measurement.

In front of the front measuring axis (first reference point 27), subsequent measuring axes (second measuring point 28, operating point 22, secondary measuring point 30) are removed in the direction of the rail track by a distance x1, _x2 and _x3 respectively. In this case, the difference between the skewness and the horizontal projection can be fundamentally corrected for longitudinal slopes related to railway construction, but can be ignored. The selective heights z ₀ , z1, z ₂ and z ₃ related to them relative to the movable cable 14 of any length are constantly measured or, depending on the measurement method (stretched cable, optical cable), are partially known. With the help of the displayed geometrical relations, the heights h ₂ , h ₃ at the working point 22 and after the secondary measurement point 30 can be determined as (hl real + ^1) ^- (ho real + ^o) ^- (ho real + Ζθ) + %2~ ^z 2

X1 (hl real + ^1) ^- (ho real + ^o) hj - (Id real + ^o) + %3 ~ ^3

Claims (11)

CLAIM 1. A movable device (1) for correcting the height position (2) of a previously measured track (3), in particular for a tamping machine with a measuring system (4) that includes measuring carts (10, 12, 16), and also includes a movable cable (14) as a relative basis, and with a lifting device (5) for lifting the rail track (3) to the height (8) specified by means of the movable cable (14) at the working point (22), which differs the fact that it includes a movable cable (14), made structurally as a leveling cable and stretched between two measuring carts (10, 12), while it is located at two base points (27, 28) along its length relative to the uncorrected zone (11 ) of the rail track (3) and at the same time in the direction of the working movement (29) behind the base points (27, 28) there is a working point (22), in which the height (21) is set using a movable cable (14), while the lifting device (5) made with the possibility lift at the working point (22) of the rail track (3) for as long as the leveling sensor (23) shows on the middle measuring trolley (16) that the predetermined level has been reached. 2. The device (1) according to claim 1, characterized in that a control unit (34) is installed to turn on the lifting unit (5) and that a measurement signal is supplied to the control unit (34) to compare the height position (2) of the track ( 3) to the working point (22) with a movable cable (14). 3. Device (1) according to claim 1 or 2, characterized in that a switching device (31) is installed for virtual lifting of the movable cable (14) and/or leveling sensor (23). 4. Device (1) according to claim 3, characterized in that the switching device (31) is connected to a storage device (32) in which the uncorrected position (7) of the track (3) is stored. 5. Device (1) according to one of claims 1 to 4, characterized in that the movable cable (14) is designed as an optical axis between two measuring devices moving along the track (3). 6. Device (1) according to one of claims 1 to 5, characterized in that the secondary measurement point (30) for registering the height position (2) of the track (3) at point (30) is located behind the operating point (22) in the working direction of travel (29). 7. Device (1) according to one of claims 1 to 6, characterized in that each of the two rails (36) of the track (3) has its own movable cable (14). 8. Device (1) according to one of claims 1 to 7, characterized in that at the base points (27, 28) and at the operating point (20) a corresponding device for measuring the inclination (38) is located. 9. A method for correcting a rail track (3) using a movable device (1) according to one of claims 1 to 8, characterized in that the movable cable (14) is moved in the working direction of movement (29) along the rail track (3), when at the base points (27, 28) virtually or with the help of leveling devices (20) according to the respective predetermined heights (8), and that the rail track (3) is raised with the help of the lifting unit (5) at the working point (22) to the predetermined using a movable cable (14) height (21). 10. The method according to claim 9, characterized in that the measured values registered at the secondary measurement point (30) are transmitted to the switching device (31) and that the preset heights (8) are matched using the switching device (31) depending on the measured values . 11. The method according to claim 10, characterized in that the measured values recorded at the remeasurement point (30) are accumulated in order to prepare a working protocol.