JP2006030076A - Long welded rail axial stress measuring device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a long welded rail axial stress measuring device for safely attaining axial stress measurement of measurement precision by automating measuring working. <P>SOLUTION: The long welded rail axial stress measuring device includes an axial pressure sensor 1 bonded to a rail R, and a data collection device 3 for managing a long welded rail by collecting axial stress values. The axial pressure sensor 1 comprises a strain gage sensor g and a temperature sensor. An axial pressure converter 2 comprises a detection value measuring bridge circuit 25 and a solar panel 24, an electric power accumulation supply device 23 for accumulating and supplying electric power generated in the solar panel 24, and an IC chip 22 incorporating a data control program of a storage or the like, and an ID tag 21 for discriminating a measuring position and includes a computer 31 collecting an axial stress value output from the axial pressure converter 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a long rail axial stress measuring device, and more particularly to a long rail axial stress measuring device that measures axial stress at a plurality of measurement points of a laying rail on a railway track using an axial pressure sensor.

  The long rail laid on the railroad track is prevented from being displaced in the vertical direction on the road bed by the vertical road bed resistance generated between the road bed and sleepers. At this time, a non-moving section is generated in the central portion of the rail, and the rail in the non-moving section does not expand or contract in principle throughout the year. That is, the thermal energy generated with the temperature change is not consumed for the expansion and contraction of the rail, and all the thermal energy is stored in the rail as thermal stress. This stored force is called axial stress. If this axial stress is excessive, the rail will overhang, and a serious accident such as train derailment may occur. Therefore, for the immovable section of the long rail, it is required to manage whether or not the buckling strength and the welding strength that can withstand the axial stress generated in the rail are always secured. Therefore, in general, long rail management consists of securing the roadbed resistance, maintaining the fastening force of the fastening device, and other hardware aspects, and managing the summer special tour and other software aspects. At that time, rail temperature has conventionally been used as an index for rail management. Management by rail temperature was a very simple management method of estimating rail axial stress from the value of a thermometer attached to the rail.

By the way, as another conventional example of the axial stress measuring device for the laying rail, a measuring mark is given to the rail before the rail is laid. Each time the axial stress measurement is performed, an operator enters the track and measures the distance between the measurement marks and the rail temperature in that state, thereby measuring the axial stress (see Patent Document 1). .
As a further conventional example, a method is known in which an operator enters a track, goes to a measurement point, installs a measurement device, and performs axial stress measurement one by one (see Patent Document 2).
In addition, the patent applicant of the present invention is to fix an axial pressure sensor comprising a strain gauge sensor and a temperature sensor to a rail before laying and calculate axial stress based on rail strain values and rail temperature values before and after laying. The "laying rail axial stress measuring device" of the prior application related to the above application has been developed (see Japanese Patent Application No. 2004-060700).
Patent No. 1709788 Specification Japanese Patent Laid-Open No. 58-071973

The current long rail management is one rail temperature per tens of kilometers, which is the jurisdiction of the district that maintains the risk of overhanging long rails laid in the sun, shade, tunnel and other various environments. It is carried out with the total value. Therefore, it has long been desired to employ rail axial stress as an evaluation index that directly represents the danger of rail overhang.
And since the axial stress measuring apparatus of the laying rail of the above-mentioned patent document 1 has to enter in a track | truck every time it performs axial stress measurement, when there are many measurement locations, it is proportional to it. A lot of measurement time and measurement personnel are required, and it is impossible to always monitor a large number of measurement points simultaneously. There is also a risk that a contact accident between the traveling vehicle and the measurement worker may occur.

  In view of the above circumstances, the present invention is a long-term system that realizes safe and highly accurate measurement of axial stress by automating the measurement work utilizing the axial stress measuring device for the laying rail using the axial pressure sensor of the prior invention. A rail axial stress measuring device is provided.

  Claim 1: An axial pressure converter 2 having an axial pressure sensor 1 attached to a rail R, which converts a sensor signal obtained by the axial pressure sensor 1 into a detection voltage corresponding to an axial stress value and outputs the detected voltage. A long rail axial stress measuring device having a data collecting device 3 that collects axial stress values output from the axial pressure converter 2 and performs long rail management, the axial pressure sensor 1 includes a strain gauge sensor g and a temperature sensor. The axial pressure converter 2 includes a detection value measurement bridge circuit 25, a solar panel 24, a power storage and supply device 23 that stores and supplies power generated by the solar panel 24, a sampling interval of measurement data, a calculation of data, It consists of an IC chip 22 with a built-in storage and other data control program, and an ID tag 21 for identifying the measurement position. To constitute a long rail axis stress measuring device having a computer 31 to collect.

[2] The long rail axial stress measuring device according to [1], wherein the axial pressure sensor 1 and the axial pressure transducer 2 are integrated and the whole is attached to the abdomen of the rail R and installed. A measuring device was constructed.
Claim 3: In the long rail axial stress measuring device according to claim 2, the axial stress measurement of the laying rail in which the axial pressure sensor 1 and the axial pressure transducer 2 are integrated at a plurality of points of the rail R is provided. Configured the device.
Claim 4: In the long rail axial stress measuring device according to claim 3, the axial stress value is wirelessly transferred to the computer 31 for managing the long rail, and the data collecting device is mounted on the traveling vehicle. An axial stress measuring device was configured.

According to the present invention, rail axial stress at an arbitrary point can be directly grasped, and fine and efficient rail management can be performed.
And it is not necessary for an operator to enter the track, and it is possible to measure a plurality of measurement points simultaneously unattended and continuously.

Moreover, it is easy to manage the axial stress values at a large number of measurement points output from the axial pressure transducer.
Furthermore, since it can be measured even during train operation, the state of the rail can always be monitored, and the problem location can be found before it becomes dangerous.

The best mode for carrying out the invention will be described with reference to the embodiments shown in the drawings. FIG. 1 is a block diagram of the embodiment, FIG. 2 is a view showing a place where the embodiment is joined and fixed to a long rail, and FIG. 3 is a view for explaining a detection value measurement bridge circuit provided in the axial pressure converter. is there.
Reference numeral 1 denotes an axial pressure sensor, which includes a strain gauge sensor g and a temperature sensor t. The axial pressure sensor 1 is bonded and fixed to a long rail that can be freely thermally expanded and contracted before laying the long rail.

Reference numeral 2 denotes an axial pressure converter, a detection value measurement bridge circuit 25, a solar panel 24, a power storage and supply device 23 that stores and supplies generated power, a sampling interval of measurement data, calculation of data, storage, and the like The IC chip 22 containing the data control program and the ID tag 21 for identifying the measurement position. The solar panel 24 constitutes a power source that supplies driving power to the components of the axial stress measuring device at any location on the railway track.
Reference numeral 3 denotes a data collection device, which includes a computer 31 that performs long rail management, and a handy terminal 32 that interconnects the axial pressure converter 2 and the personal computer 31.

Next, the operation of each part of the embodiment will be described.
As described above, the axial pressure sensor 1 is joined and fixed to the abdomen of the long rail before laying as shown in FIG. If there are a plurality of measurement points by the axial pressure sensor 1, an axial stress measurement device that measures a plurality of points simultaneously can be configured. The measured values are stored in the IC chip 22, and all measured values can be referred to at any time.

  Here, the detection value measurement bridge circuit 25 that measures the voltage that is the output value of the strain gauge sensor will be briefly described with reference to FIG. 3 (the details of the voltage measurement that is the output value of the strain gauge sensor are described above in detail). Application No. 2004-060700). The electrical circuit in the axial pressure transducer 2 that constitutes the axial stress measuring device for the laying rail is a bridge that eliminates errors caused by fluctuations in the external temperature of the components used in the electrical circuit from the viewpoint of performing accurate axial stress measurement. The electric circuit structure includes a circuit. This bridge circuit is configured with four sides of a resistance value corresponding to the strain value of the rail R, a reference resistance exhibiting zero temperature characteristics, and three 120Ω resistors. A detection voltage is obtained at the right end with 2.5 V as a reference voltage. In the bridge circuit, the resistance value of the strain gauge sensor g is measured by switching three high-speed electronic switches such as the photo-moss relay 21 to the upper side, and the resistance value of the reference resistance is measured by switching to the lower side. The resistance value corresponding to the strain value of the rail R obtained by the strain gauge sensor g and the zero temperature characteristic resistance value not affected by the external temperature change obtained by the reference resistance are alternately switched and measured, and the detection voltage is obtained as the difference between them. This is the measured value of the strain gauge sensor g. As described above, when the photo moss relay 21 is switched and measurement is performed on the strain gauge sensor side, the detected voltage is generated in the analog circuit portion including the change from the strain gauge reference value and the bridge circuit on the substrate. Error is included. When the photoMOS relay 21 is switched and measurement is performed on the reference resistance side, the detected voltage is only an error generated in the analog circuit section on the substrate. Therefore, by obtaining the difference between the two voltages, it is possible to remove the error generated in the analog circuit unit. As a result, the strain gauge sensor g and the reference resistance are almost the same at the same time by the high-speed switching of the photoMOS relay 21. Since it is measured according to conditions, even if each component used in the analog circuit is affected by external temperature changes, this effect is canceled out in the bridge circuit, and the strain gauge sensor output value can be measured with stable accuracy. .

Since the power is generated by the solar panel 24, even if it is difficult to secure the power supply at the measurement point on the railroad track, the necessary and sufficient power can be generated easily and cheaply by the solar power generation and secured in the power storage and supply device 23. can do. Thereby, the axial stress measuring apparatus can set any measuring point without restricting the use lift. The power source composed of the solar panel 24 and the power storage and supply device 23 is convenient as a power source for a long rail axial stress measuring device used along a railway line inconvenient for securing power.
The IC chip 22 controls the entire axial stress measuring device, realizes a small and non-intrusive device, and changes the built-in program to change various measurement conditions and make the measured value dangerous. It responds flexibly to the addition of alarms and other functions when values are shown.

The ID tag is used for identifying the location of a plurality of measurement points and ensuring management of measurement data for each measurement point.
Further, since the ID tag can also have a wireless function, the axial stress value accumulated in the IC chip can be transmitted from the ID tag and received from a remote position using a reader.
The handy terminal easily acquires the axial stress value transmitted from the ID tag at any time, and further transfers the axial stress value to a computer that performs long rail management.

If these are used, the axial stress value at each measurement point is received and collected by a traveling vehicle equipped with a data collection device, so that the data transfer equipment is also small and very cost-effective for a large number of measurement points. A low axial stress measuring device can be realized.
Furthermore, in the axial pressure converter 2, the power storage and supply device 23, which has a large outer dimension as compared with other components, is further downsized, and the axial pressure sensor 1 and the axial pressure converter 2 are integrated. Thus, it is possible to adopt a form in which these are all attached to the abdomen of the rail R. According to this, it is easy to secure the installation space, and the installation work can be easily performed at low cost.

  By the way, as a management method of the long rail currently generally used, the movement amount in the longitudinal direction of the rail is measured at each measurement point at intervals of 100 m to 500 m, and the amount of contraction of the rail within this interval is changed to the axial stress. A method of calculating and managing the corresponding value is adopted. In this case, since the movement amount is measured by manual inspection by an operator, it cannot be said that the measurement accuracy is good, which is a problem. For example, if the measurement is not accurate and the amount of shrinkage is assumed to be larger than the actual value, the axial stress is overestimated, and in some cases the rail setting must be changed to release the axial stress. Judgment is made. The costs associated with this are very high, and countermeasures are currently being sought.

  On the other hand, if the axial stress measurement device of the present invention is introduced, axial pressure sensors are arranged at appropriate intervals for each long rail, and the axial stress distribution in the long rail is estimated, the accuracy of the long rail can be estimated more accurately. The axial stress state can be grasped over time. As a result, it is possible to determine the appropriate time to change the rail setting, and if there is an abnormal distribution of axial stress, the location can be found immediately and efficient management of the railway track is realized. be able to.

The block diagram of an Example. The figure which shows the place which fixed the axial-stress measuring apparatus. The figure explaining a detection value measurement bridge circuit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Axial pressure sensor 2 Axial pressure converter 21 ID tag 22 IC chip 23 Power storage supply device 24 Solar panel 25 Detection value measurement bridge circuit 3 Data collection device 31 Computer 32 Handy terminal g Strain gauge sensor t Temperature sensor

Claims (4)

It has an axial pressure sensor attached to the rail, and has an axial pressure converter that converts the sensor signal obtained by the axial pressure sensor into a detection voltage corresponding to the axial stress value and outputs it. In a long rail axial stress measurement device having a data collection device that collects output axial stress values and performs long rail management,
The axial pressure sensor consists of a strain gauge sensor and a temperature sensor,
Axial pressure converter has built-in detection value measurement bridge circuit, solar panel, power storage and supply device that stores and supplies power generated by solar panel, sampling interval of measurement data, data calculation, storage and other data control programs IC chip, which consists of an ID tag that identifies the measurement position and transmits the axial stress value by radio etc.
The long rail axial stress measuring device, wherein the collecting device has a computer for collecting axial stress values output from the axial pressure transducer. In the long rail axial-stress measuring apparatus described in Claim 1,
A long rail axial stress measuring device, wherein an axial pressure sensor and an axial pressure transducer are integrated and attached to the abdomen of the rail. In the long rail axial-stress measuring apparatus described in Claim 2,
A long rail axial stress measuring device characterized in that the entire integrated axial pressure sensor and axial pressure transducer are installed at a plurality of points on the rail. In the long rail axial-stress measuring apparatus described in Claim 3,
A long rail axial stress measuring device, wherein the axial stress value is wirelessly transferred to a computer that performs long rail management, and the data collecting device is mounted on a traveling vehicle.

Images