JP2009235699A - Sensing stick for measurement of vibrational acceleration of ballast of railroad track, and usage method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensing stick for the measurement of vibrational acceleration of a ballast of a railroad track, which can be easily installed by minor operations, and a usage method for the sensing stick. <P>SOLUTION: In this sensing stick for the measurement of the vibrational acceleration of the ballast of the railroad track, a triaxial acceleration sensor is incorporated into a leading end portion of a rigid pile; and a cable connected to the triaxial acceleration sensor is provided along the rigid pile, and taken out from a side surface of the rigid pile except a back end portion of the rigid pipe. The sensing stick 5 is installed by being driven into the ballast (crushed stone ballast) 2 below a concrete sleeper 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a sensing stick for measuring a track floor vibration acceleration of a railway track used as a field measuring sensor for a railway track and a method of using the same.

  The track structure during train travel has been measured in the past, but all are related to rails and sleeper surfaces, and there are few examples of direct measurement of the behavior of crushed stone inside the road bed, which is difficult to measure. Although there are measurement examples in which an acceleration sensor is embedded in crushed stone, the data obtained are only measured values for a specific uniaxial direction, and it is not known which axis the crushed stone itself is facing, and the three-dimensional shape of the crushed stone I couldn't figure out the movement.

  In addition, in order to measure the movement of a falling rock, there is one measured by attaching an acceleration sensor inside the falling rock (see Non-Patent Document 1 below).

  However, this measurement method uses a uniaxial sensor and cannot detect a change in the direction of movement when the falling rock rotates. In addition, since it is not a wired connection, it is difficult to obtain measurement data.

  Conventionally, measurement of vibration acceleration inside the bed is effective for grasping the deterioration state and dynamic response characteristics of the inside of the road bed regarding the ballast track composed of rail, sleeper, and crushed ballast. For this purpose, a sensing stone incorporating an acceleration sensor in the actual crushed stone ballast is embedded in the roadbed to perform measurement.

  The present inventor uses two sets of piezoresistive three-axis acceleration sensors instead of the conventional one-axis sensor, so that three-dimensional translational behavior and rotational behavior can be achieved regardless of the direction of the ballast crushed stone. A sensing stone that can be measured simultaneously has been developed.

In addition, we have developed a sensing stone with noise countermeasures that incorporates an ultra-small CPU inside the crushed stone, performs A / D conversion in the absence of noise in the immediate vicinity of the sensor, and acquires measurement information through optical digital communication. The effectiveness of the device was confirmed by in-orbit measurement.
"Study on rock movement mechanism, Part 2-Measurement method of rock fall movement, Takeshi Ujo, Shoji Shinohara, Kazumi Ieishi, Symposium on geo-disaster and ground environment in Shikoku, Geotechnical Society Shikoku Branch, September 2004

  FIG. 6 is a drawing-substituting photograph showing a conventional sensing stone installation state.

  In this figure, 101 is a sensing stone, 102 is a crushed ballast as a roadbed on which the sensing stone 101 is installed, and 103 is a concrete sleeper.

  For the installation of the sensing stone, it is essential to remove some crushed stones on the underside of the sleeper at the measurement point in advance by night work, install the sensing stone at that position, refill the crushed stone ballast, and further solidify It is. At that time, although it is only the width necessary for the installation work of the sensing stone, the crushed stone on the underside of the sleeper is temporarily removed and backfilled again, so the state of the roadbed is slightly different from the original state. As a result, there is a problem that measurement in a natural state of the ballast is not possible.

  In addition, while sensing stone is installed and collected, the ballast on the underside of the sleeper is temporarily removed. While the sensing stone itself is manually installed and collected, the sleeper is not overcharged in spite of the time. Unsupported). If some external force is applied during the work, or if the fastening portion with the rail supporting the sleeper is removed, there is a risk of injury.

  An object of the present invention is to solve the above-mentioned problems and to provide a sensing stick for measuring the road bed vibration acceleration of a railway track and a method of using the same, which can be easily installed with a light work.

In order to achieve the above object, the present invention provides
[1] In the sensing stick for measuring the bed vibration acceleration of the railway track, no processing is applied to the front and rear ends of the hard pile, and a hollow portion is communicated with the hollow portion at the front end portion of the hard pile. A long groove extending to a position leaving the rear end of the hard pile, the triaxial acceleration sensor is stored in the recess, and a resin connected to the triaxial acceleration sensor is stored in the long groove. It is characterized by being enclosed.

  [2] In the method of using the sensing stick for measuring the roadbed vibration acceleration on the railroad track, the sensing stick for measuring the roadbed vibration acceleration on the railroad track described in [1] above is driven in from the outside of the railroad trackbed. The three-axis acceleration sensor at the tip of the sensing stick is installed at a predetermined position in the railroad bed.

  [3] In the method of using the sensing stick for measuring the track floor vibration acceleration on the railroad track, the daytime work is performed by driving or pulling out the sensing stick for measuring the track floor vibration acceleration on the railroad track described in [1] above. It is possible to install and collect the sensing stick for measuring the road bed vibration acceleration.

  [4] The sensing stick for measuring the road bed vibration acceleration of the railway track described in [1] is characterized in that the road bed vibration acceleration is measured at many measuring points while changing the location on the same track. .

  According to the present invention, since it is only necessary to drive the hard pile into a predetermined position of the ballast below the sleeper, it is possible to install and collect the equipment even during the daytime work, which is not a prior night work. In addition, in the conventional measurement method, only the point can be measured once installed, but according to the present invention, the installation / recovery operation has become very simple. It becomes possible to measure the acceleration of the road bed vibration.

  In the sensing stick for measuring the floor vibration acceleration of the railroad track of the present invention, the tip and the rear end of the hard pile are not processed, and the tip of the hard pile communicates with the recess, and the recess. A long groove extending to a position leaving the rear end of the hard pile, the triaxial acceleration sensor is stored in the recess, and a resin connected to the triaxial acceleration sensor is stored in the long groove. It is characterized by being enclosed.

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

  FIG. 1 is a diagram showing an installed state of a sensing stick for measuring the road bed vibration acceleration on a railway track according to an embodiment of the present invention.

  In this figure, 1 is a roadbed, 2 is a crushed stone ballast as a roadbed, 3 is a concrete sleeper placed on the ballast 2, 4 is a rail, 5 is a roadbed vibration placed on the ballast 2 below the concrete sleeper 3 An acceleration measuring sensing stick 6 is a cable drawn from the sensing stick.

  In this way, the sensing stick 5 for measuring the road bed vibration acceleration is inserted into the crushed ballast 2 as the road bed, and the rear end of the sensing stick 5 is struck and set to a predetermined position.

  Hereinafter, the sensing stick for measuring the road bed vibration acceleration will be described in detail.

  FIG. 2 is a drawing-substituting photograph showing a sensing stick for measuring the road bed vibration acceleration before mounting the sensor according to the embodiment of the present invention, and FIG. 3 is a drawing of the sensing stick for measuring the road floor vibration acceleration mounted with the sensor according to the embodiment of the present invention. FIG. 4 is a drawing-substituting photograph showing the tip portion of the sensing stick for measuring the road bed vibration acceleration showing the embodiment of the present invention, and FIG. 5 is a drawing-substituting photograph showing the state of the embodiment of the present invention. It is a drawing substitute photograph which shows the state by which the whole sensing stick for the road bed vibration acceleration measurement shown was enclosed with resin.

  In these figures, 11 is a hard pile, 12 is the front end of the hard pile 11, 13 is the rear end of the hard pile 11, 14 is a recess formed in the front end of the hard pile 11, and 15 is a recess. 14, the rear end 13 of the hard pile 11 is a long groove formed to the remaining position, 16 is a triaxial acceleration sensor mounted in the recess 14, and 17 is connected to the sensor 16 mounted in the long groove 15. The cable 18 is a resin sealed in the recess 14 or the long groove 15.

  With this configuration, when installing the sensor, as shown in FIG. 1, the sensing sticks 5 and 11 for measuring the vibration acceleration of the roadbed are inserted into the crushed stone ballast 2 as the roadbed below the concrete sleeper 3. Thereafter, the rear ends 13 of the sensing sticks 5 and 11 are struck and driven, and the three-axis acceleration sensor at the front end of the sensing stick is installed at a predetermined position in the railroad bed.

  Further, when collecting the sensor, it is only necessary to pull out the sensing sticks 5 and 11 that have been driven.

  In addition, the roadbed vibration acceleration measurement sensing stick 5 can be installed and collected in a daytime work by a short-time work by driving or pulling out the roadbed vibration acceleration measurement stick 5.

  Furthermore, the roadbed vibration acceleration measurement sensing stick 5 on the railroad track can measure the roadbed vibration acceleration at a number of measurement points while changing the location on the same track.

  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.

  INDUSTRIAL APPLICABILITY The present invention can be used as a sensing stick for measuring the road bed vibration acceleration on a railway track that can be easily installed by a minor work of the present invention.

It is a figure which shows the installation state of the sensing stick for the roadbed vibration acceleration measurement of a railroad track which shows the Example of this invention. It is a drawing substitute photograph which shows the sensing stick for the roadbed vibration acceleration measurement before mounting | wearing of the sensor which shows the Example of this invention. It is a drawing substitute photograph which shows the front-end | tip part of the sensing stick for a road bed vibration acceleration measurement with which the sensor which shows the Example of this invention was mounted | worn. It is a drawing substitute photograph which shows the state by which the front-end | tip part of the sensing stick for a road bed vibration acceleration measurement which shows the Example of this invention was enclosed with resin. It is a drawing substitute photograph which shows the state by which the whole sensing stick for road bed vibration acceleration measurement which shows the Example of this invention was enclosed with resin. It is a drawing substitute photograph which shows the arrangement | positioning condition of the conventional sensing stone.

Explanation of symbols

1 roadbed 2 roadbed (crushed ballast)
3 Concrete Sleeper 4 Rail 5 Roadbed Vibration Acceleration Sensing Stick 6 Cable 11 Hard Pile 12 Hard Pile Tip 13 Hard Pile Rear End 14 Recessed Part 15 Long Groove 16 Triaxial Acceleration Sensor 17 Cable 18 Sealed Resin

Claims (4)

  No processing is applied to the front and rear ends of the hard pile, a hollow portion is provided at the front end portion of the hard pile, and a long groove that communicates with the hollow portion and extends to a position leaving the rear end of the hard pile. And the triaxial acceleration sensor is housed in the recess, and a cable connected to the triaxial acceleration sensor is housed in the long groove, and a resin is sealed therein. Sensing stick.   The sensing stick for measuring the road bed vibration acceleration of the railway track according to claim 1 is driven in from the outside of the railway bed, and the three-axis acceleration sensor at the tip of the sensing stick is placed inside the railway bed. A method of using a sensing stick for measuring a road bed vibration acceleration on a railway track, characterized by being installed at a predetermined position.   The sensing stick for measuring the road bed vibration acceleration of the railroad track according to claim 1 can be installed and collected in a daytime work by driving or pulling out the sensing stick for the road bed vibration acceleration measurement in a short time. A method of using a sensing stick for measuring the vibration of a track floor on a railway track, characterized by   The railroad track basement according to claim 1, wherein the roadway vibration acceleration sensing stick for a railroad track measures the floor vibration acceleration at a number of measuring points while changing the location on the same track. How to use the sensing stick for vibration acceleration measurement.