JP2008139178A - Method of measuring railroad construction limit and its measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of measuring a railroad construction limit for accurately calculating a distance between a structure and a car body in response to the shape of a track by using track measured data to calculate a real curve radius and a cant of a proper part, and to provide its measuring device. <P>SOLUTION: The method of measuring the railroad construction limit for measuring the distance of a track lateral direction between the track and the ground structure includes: really measuring line displacement measured at constant intervals on the track in addition to the distance between the track and the ground structure by a calculus of a finite difference; really measuring level displacement by the cant at the position of a bogie of a railway vehicle; and calculating a local curvature of the track and an inclined angle of a track face on the basis of really measured values of the line displacement and the level displacement. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a railway building limit measuring method and a measuring device therefor.

  Conventionally, the following patent documents 1-3 are mentioned as a railway building limit measurement or a railway building limit determination method of such a technical field.

  FIG. 7 is a diagram showing the construction limit and vehicle limit of a conventional Japanese railway line, FIG. 8 is a diagram showing the deviation amount of the curved section, FIG. 9 is a calculation diagram of the deviation amount, and FIG. It is explanatory drawing of the correction | amendment of the deviation amount in an area.

  As shown in FIG. 7, conventionally, an area called “building limit” 104 is set on the railroad track to prevent contact between the vehicle 101 and the ground structure 102 and the like. It is stipulated not to build. Similarly, an area called “vehicle limit” 105 is also set on the vehicle 101 side, and it is determined not to manufacture a vehicle larger than this. The railway operator periodically measures the building limit 104 and corrects the position of the structure as necessary. Reference numeral 103 denotes a rail surface.

  In FIG. 8, the railroad track is continuously curved with a curve 201 or the like, but since the railcar 202 has a square shape, the interval between the building limit and the vehicle limit changes in the curve 201 section. . This amount is called the “bias amount”. The deviation amount includes a deviation amount 203 inside the curve and a deviation amount 204 outside the curve.

It is known that these deviation amounts are calculated by the following formula from geometric conditions (see FIG. 9).
(1) bias amount of curve inner W ₁ = R-√ ^{[(R-d) 2 - (} L 1/2) 2 ] ... (1)
d = R-√ _{^{[R 2 - (L 0/2}} ) 2 ]
(2) bias amount of the curve outer W ₂ = √ [R + (B / 2) -W 1 ] ² + (L _2/2) ^2] -R- (B / 2)
... (2)
However, the meaning of the variables is as follows: L ₀ : Axle distance (wheel base) of the carriage, L ₁ : Distance between the carriage centers, L ₂ : Total length of the car body, B: Full width of the car body, R: Curve radius As shown, the distance between the vehicle body (vehicle) 301 and the structure (platform) 302 changes even in a section where the raceway surface is inclined (hereinafter referred to as “cant section”). For example, when the platform 302 is outside the curve as shown in FIG. 10, the amount of deviation is corrected as shown in the following equation (3).

X ₂ = W ₂ −h · tan α (3)
Where h: home height, C: left-right rail height difference (cant), G: left-right rail distance (gauge)
Usually, in calculating the above formulas (1) to (3), the curve radius R and cant C use the design values of the curve.
JP 05-288514 A JP 2001-304860 A JP 2005-271717 A

  However, normally, in calculating the above formulas (1) to (3), the curve radius R and cant C use the design values of the curve. However, since the actual track has an irregular rail position in the longitudinal direction called track displacement, the radius of curvature and the cant are different from the design values. Due to this, accidents where the vehicle and the platform come into contact rarely occur.

  On the other hand, there are Patent Document 1 and Patent Document 2 described above as building limit measuring means, both of which consider the separation between the rail and the structure in a certain section on the track, and the longitudinal direction of the track shape. It is not something that focuses on changes. Further, in Patent Document 3 described above, it is shown that measured values in the field are used as the curve radius and cant, but a specific measurement method with respect to changes in the measured value of the curve radius and cant is not described.

  In view of the above situation, the present invention calculates the actual curve radius and cant of the part using the track measurement data, and accurately calculates the distance between the structure and the vehicle body according to the shape of the track. It is an object to provide a method and a measuring device thereof.

In order to achieve the above object, the present invention provides
[1] A railway building limit measuring method for measuring the distance between the track and the ground structure in the track lateral direction, as measured at regular intervals on the track in addition to the distance between the track and the ground structure. The displacement is measured by the difference method, the level displacement is measured by the cant at the position of the railcar, and the local curvature of the track and the inclination angle of the track surface are calculated based on the measured values of the displacement and the level displacement as described above. It is characterized by that.

  [2] In the railway building limit measuring method according to [1], the curvature is calculated by using a value of a circle passing through a total of three points of a point of interest on a railway vehicle body and two railway carriages.

  [3] A railway building limit measuring apparatus for measuring the distance between the track and the ground structure in the track lateral direction, as measured at regular intervals on the track in addition to the distance between the track and the ground structure. Displacement measuring means as measured by the difference method, level displacement measuring means for measuring the cant at the position of the railcar, and as described above, based on the measured values from the displacement measuring means and the level displacement measuring means, And a means for calculating a specific curvature and an inclination angle of the raceway surface.

  [4] In the railway building limit measuring device according to [3], the curvature calculation means based on a circle passing through a total of three points of the center points A and B of the railway vehicle carriage and the wife C of the railway vehicle is provided. It is characterized by doing.

  According to the present invention, the actual curve radius of the part is obtained using the displacement data as measured at regular intervals on the trajectory. In addition, the Kant measurement value at the position of the bogie of the railway vehicle is used as the cant, so that the railway building limit measurement can be accurately performed to cover the change of data with time, and the railway vehicle can be operated safely. Can do.

  In addition, the actual curve radius and cant of the relevant part are calculated using the track measurement data, and the shape of the track is particularly focused on a circle composed of the center of the bogie of the railway vehicle and the center of the car body or the car body part. Accordingly, the distance between the structure and the vehicle body can be accurately calculated.

  The railway building limit measuring method for measuring the distance between the track and the ground structure of the present invention in the lateral direction of the track, in addition to the distance between the track and the ground structure, the displacement as measured at regular intervals on the track. Actual measurement is performed by the difference method, level displacement is actually measured by a cant at the bogie position of the railway vehicle, and the local curvature of the track and the inclination angle of the track surface are calculated based on the measured values of displacement and level displacement as described above.

  Hereinafter, embodiments of the present invention will be described in detail.

  First, using the displacement data as measured at regular intervals on the trajectory, the actual curve radius of the part is obtained. Moreover, the measured value of the cant at the bogie position of the railway vehicle is used as the cant.

  FIG. 1 is a diagram showing a displacement measuring method as shown in the embodiment of the present invention.

  Street displacement is usually measured by a principle called the difference method. For example, in the case of a commonly used 10 m string positive arrow method, a 10 m long string 2 is applied to a rail (track) 1 as shown in FIG. Measure the distance d in the left-right direction. In order to measure more easily, a method for measuring the separation of the rail at the center position of a 2 m string has also been proposed. Such measurement is continuously performed from the start point to the end point of the line at a constant interval (for example, 25 cm interval) in the line longitudinal direction.

  FIG. 2 is a diagram showing the positional relationship between the center position of the carriage and the vehicle body wife and the separation at the carriage position according to the embodiment of the present invention.

Consider the amount of deviation outside the curve. As shown in FIG. 2, let us consider a circle passing through the center positions A and B of the railway vehicle and the vehicle body end C. In the above equation (2) for obtaining the amount of deviation, it is necessary to input the radius of this circle. On the other hand, if the chord lengths p and q and the distance d ₁ between the point B and the chord AC are known in FIG. 2, the radius R of the circle passing through the points A, B and C is expressed by the following equation (4). Is done.

R = pq / 2d ₁ (4)
The string lengths p and q are known from the structure of the vehicle. Therefore, if the distance d ₁ between the point B and the chord AC is known, the radius R of the circle passing through the points A, B, and C can be obtained.

  By the way, if the orbital displacement is measured by the difference method, it can be converted into data having a different chord length.

  FIG. 3 is an explanatory diagram of the conversion from the difference method to the difference method according to the embodiment of the present invention. FIG. 3 (a) shows the positional relationship between the strings and the rails at the time of measurement, and FIG. 3 (b) shows the conversion. The positional relationship between the rear string and the rail is shown.

In FIG. 3, 11 is a rail at the time of inspection, 12 is a string at the time of inspection (a + b), d ₃ is a measured value at the time of inspection, 21 is a rail after conversion, 22 is a string after conversion (p + q), d ₂ is a measured value after conversion.

  As shown in FIG. 3A, it is assumed that the orbital displacement is measured at a distance a from the end with respect to a string having a length a + b. The spatial series waveform obtained by this is the position at the distance p from the end with respect to the p + q string (however, the position on the line is the same in FIG. 3 (a) and FIG. 3 (b)). The transfer function converted into the measurement waveform is expressed by the following equation (5).

Where X (ω): Fourier transform of the measured waveform by the method of FIG.
Y (ω): Fourier transform of the measurement waveform by the string in FIG. 3B. Accordingly, the measurement waveform for the string of length p + q in the above equation (5) is compared with the trajectory inspection waveform by the method of FIG. If the Fourier transform is obtained and further inverse Fourier transformed, the distance d ₁ between the point B and the chord AC shown in FIG. 2 can be continuously calculated in the line longitudinal direction.

  As a result, the radius of the circle passing through the points A, B, and C is obtained in the equation (4), and if this is substituted into the equation (2), the deviation amount considering the actual shape of the trajectory is obtained. .

Note that the amount of deviation at the center of the vehicle body can be calculated in the same manner as in the case of the body part of the vehicle body by setting p = q = L _1/2 .

  FIG. 4 is a block diagram showing a specific example of the railway building limit measuring apparatus of the present invention, and FIG. 5 is a measurement of the displacement and level displacement (cant) by a track displacement measuring apparatus (2 m string) showing a specific example of the present invention. FIG. 6 is a photograph showing a state measured by a railway building limit measuring apparatus showing a specific example of the present invention.

  In FIG. 4, 31 is a track displacement measuring device, 32 is a railway building limit measuring device, 33 is a data processing device, 34 is an input interface device, 35 is a computing device, 36 is an output interface device, and 37 is a display device.

  As shown in FIG. 5, the orbital displacement measuring device 31 includes an orbital displacement measuring device that measures a displacement and a level displacement (cant) as measured by a differential method using a 2 m string. As shown in FIG. 10, the railway building limit measuring device 32 may be a railway building limit measuring device. If the track displacement / level displacement (cant) and the railway building limit are measured at the same point, the device may not be integrated.

  The data processing device 33 includes an input interface device 34, a calculation device 35, and an output interface device 36. The calculation device 35 performs the calculations of the above formulas (1) to (5), and finally the track, the vehicle body, Calculate the separation of.

  The display device 37 is a display or paper printing device. In addition, the recording apparatus to a magnetic medium may be sufficient.

  In addition, this invention is not limited to the said Example, Based on the meaning of this invention, a various deformation | transformation is possible and these are not excluded from the scope of the present invention.

  The railway building limit measuring method and apparatus of the present invention can be used as a tool for carrying out accurate railway building limit measurement.

It is a figure which shows the measuring method of a displacement as an Example of this invention is shown. It is a figure which shows the positional relationship of the trolley | bogie center position and vehicle body wife part which shows the Example of this invention, and the separation | separation in a trolley | bogie position. It is explanatory drawing of the conversion from the difference method to the difference method which shows the Example of this invention. It is a block diagram which shows the specific example of the railway building limit measuring apparatus of this invention. It is a photograph which shows the measurement state of a displacement and a level displacement (kant) by the orbital displacement measuring apparatus (2m string) which shows the specific example of this invention. It is a photograph which shows the measurement state by the railway building limit measuring apparatus which shows the specific example of this invention. It is a figure which shows the construction limit and vehicle limit of the conventional line of the conventional Japanese railway. It is a figure which shows the amount of deviation of the conventional curve area. It is a calculation diagram of the conventional bias amount. It is explanatory drawing of the correction | amendment of the amount of deviation in a cant area.

Explanation of symbols

1 rail (track)
2 String A, B Center position of the bogie of the railroad car C Body radius RA Radius of the circle passing through A, B, C 11 Rail at the time of inspection 12 String at the time of inspection (a + b)
13 Measurement value during inspection (d ₂ )
21 Rail after conversion 22 String after conversion (p + q)
23 Measured value after conversion (d ₁ )
DESCRIPTION OF SYMBOLS 31 Track displacement measuring device 32 Railway building limit measuring device 33 Data processing device 34 Input interface device 35 Arithmetic device 36 Output interface device 37 Display device

Claims (4)

  A railway building limit measurement method for measuring the distance between a track and a ground structure in the lateral direction of the track, and in addition to the distance between the track and the ground structure, the displacement is differentially measured as measured at regular intervals on the track. The level displacement is actually measured by a cant at the position of the bogie of the railway vehicle, and the local curvature of the track and the inclination angle of the track surface are calculated based on the measured values of the displacement and the level displacement as described above. Railway building limit measurement method.   The railway building limit measuring method according to claim 1, wherein a value of a circle passing through a total of three points of a point of interest on a railway car body and two railway carriages is used for calculating the curvature. .   A railway building limit measuring device that measures the distance between the track and the ground structure in the track lateral direction, and in addition to the distance between the track and the ground structure, the displacement is differentially measured as measured at regular intervals on the track. The displacement measurement means as measured by the method, the level displacement measurement means for measuring the cant at the bogie position of the railway vehicle, and the local curvature of the track based on the measurement values from the displacement measurement means and the level displacement measurement means as described above. And a railway building limit measuring apparatus comprising: a means for calculating an inclination angle of the raceway surface.   4. The railway building limit measuring apparatus according to claim 3, further comprising means for calculating the curvature based on a circle passing through a total of three points of the center points A and B of the bogie of the railway car and the wife C of the railway car. Railway building limit measuring device.