CN111452829A

CN111452829A - Bidirectional rail clearance measuring method

Info

Publication number: CN111452829A
Application number: CN201910055497.XA
Authority: CN
Inventors: 林凤涛; 黄琴; 李志和
Original assignee: East China Jiaotong University
Current assignee: East China Jiaotong University
Priority date: 2019-01-21
Filing date: 2019-01-21
Publication date: 2020-07-28

Abstract

During train running, the trains meeting in the same direction and the opposite direction are more in number, and the railway roadbed can generate transverse deviation to a certain degree due to the movement of the crust. Therefore, the measurement of the limit of the bidirectional rail is indispensable when the driving safety and the personal safety of passengers are required to be ensured. The two-way rail clearance measuring method mainly comprises a laser measuring instrument (1) and a trolley (2) on a track (3). The laser measuring instrument (1) is placed in the center of the roof of the trolley (2) so that the trolley (2) can move on the track (3). The method mainly comprises the steps of emitting laser to a designated point on the inner side of a track by operating a laser measuring instrument (1) horizontally downwards, receiving laser signals to obtain the distance from a laser emitting point (the center of the track) to the point on the inner side of the track, and calculating the distance between the center distances of the two tracks by calculating a trigonometric function and processing data. The method has the advantages of more accurate data, higher efficiency, reduction of the use of labor personnel, guarantee of the safety of personnel and reduction of the cost.

Description

Bidirectional rail clearance measuring method

Technical Field

The invention relates to a method for measuring a two-way railway track clearance, in particular to a track center distance clearance laser ranging method, and belongs to the technical field of measurement. When two trains run in the same direction or in opposite directions to meet each other in the way, the distance between the centers of the tracks determines whether the two trains can safely pass through, so that the measurement of the center distance between the two tracks is very necessary.

Background

At present, in the running process of a train, the number of trains meeting in the same-direction running and reverse running is large, or due to the movement of a crust, a railway roadbed can generate transverse deviation to a certain degree. Therefore, the measurement of the limit of the bidirectional rail is indispensable when the driving safety and the personal safety of passengers are required to be ensured. At present, the measurement of the track center distance is generally manual measurement, the workload is very large, the measurement error is also large, the mode is low in efficiency, the cost is also large due to more used labor force, and the inaccuracy of the obtained data can also influence the safety of train running. Further, in the manual measurement process, safety of workers cannot be fully ensured, and a plurality of workers are required to act together, which also increases costs. In view of the above, in order to solve the problems encountered in the above measurement process, a laser ranging method has been developed, which can measure the distance of the center distance of the bidirectional tracks.

Disclosure of Invention

The invention provides a distance measuring method for measuring the central limit of two rails. It has the advantages that: the measurement is not needed manually, the data acquisition by laser measurement is faster, and the measurement time is greatly reduced. The method is mainly formed by placing a laser measuring instrument (1) and a trolley (2) on a track (3). The laser measuring instrument (1) is placed in the center of the top of the trolley (2) so that the trolley (2) can move on the track (3). And operating the laser measuring instrument (1) to horizontally and downwards emit laser to the inner side of the track, receiving a laser signal, obtaining the distance from a laser emitting point (the center of the track) to the inner side point of the track, obtaining a final data result of the distance between the centers of the two tracks through trigonometric function calculation and data processing, and judging whether the distance is within a safety range. Compared with a manual type, the laser measuring device is more accurate in data obtained through laser measurement, can measure multiple groups of data in a short time, is shorter in measuring time, improves efficiency, reduces cost, is higher in safety, and is less in manpower use.

Drawings

FIG. 1 is a schematic structural view of a carriage, which includes (1) a laser measuring instrument and (2) a carriage, and is placed on a rail (3);

fig. 2 is a schematic diagram of a laser gauge on a cart emitting a laser spot horizontally down the inside of a track.

Detailed Description

1) First, the cart is placed on two rails with the laser detector at the top of the cart center, the laser gauge is manipulated to provide a horizontal down angle α to the side rail₁A point a 12mm below the top of the side rail emits laser as a first measuring point, α₁For the deflection angle, an OA of L was obtained₁By the formula:

L₃＝OA*cosα₁＝L₁*cosα₁

the distance between the center of the laser measuring instrument and the inner side of the left steel rail is L₃；

Steering the laser gauge to the side rail horizontal down angle α₂A point B12 mm below the top of the side rail emits laser as a second measuring point B, α₂To a deflection angle, OB of L was obtained₂By the formula:

L₄＝OB*cosα₂＝L₂*cosα₂

the distance between the center position of the laser measuring instrument and the inner side of the right steel rail is L₄。

2) The known rail width BC has a length L₆By the formula:

L₅＝L₃-L₄＝L₁*cosα₁-L₂*cosα₂

L₇＝L₅-L₆＝L₁*cosα₁-L₂*cosα₂-L₆

i.e. a track pitch distance of L₇。

3) Finally, the track center distance can be expressed as half of the track pitch plus the width of the track, plus the distance from the center position of the laser measuring instrument to the inner side of the right steel rail, that is, by the formula:

the distance between the centers of the two tracks is L.

Claims

1. A novel method for measuring the center distance of a bidirectional track, namely a track laser measurement method. The method mainly comprises a laser measuring instrument (1) and a trolley (2). The laser measuring instrument (1) horizontally emits laser to the inner side of the track downwards, receives laser signals, obtains the distance from a laser emitting point (the center of the track) to a point on the inner side of the track, and obtains a final data result of the distance between the centers of the two tracks through trigonometric function calculation and data processing, so that whether potential safety hazards exist in the safety distance between the two adjacent tracks or not is judged.

2. According to claim 1, the distance measurement of the laser measuring instrument (1) along the railway can be carried by the built trolley (2).

3. According to the claim 1, the laser emitted from the laser measuring instrument (1) can calculate the linear distance of the measured point from the instrument according to the elapsed time.

4. According to claim 1, the trigonometric conversion method designed for the laser measuring instrument (1) allows to convert the linear distance measured by the laser into the horizontal distance of the centers of the two tracks.

5. According to claim 1, the calculated actual horizontal distance of the rail is compared with a standard distance between two adjacent rails to determine whether the adjacent rail has a safety hazard.