JP6548918B2 - Trajectory measurement device and trajectory measurement method - Google Patents

Description

  The present invention relates to a track measurement apparatus and track measurement method for measuring distortion of a track or rail used to grasp a repair time of a track bed in a track and a replacement time of a rail.

  A ballast track generally used as a track bed structure is relatively susceptible to rail distortion, and maintenance work such as ballast replacement and track consolidation is performed to correct the distortion. Since it is necessary to carry out the track maintenance work of the ballast track regularly according to the number of times of train passing etc., cost reduction has been required. Therefore, we have developed a TC type labor saving track that requires no maintenance for more than 10 years after construction by doubling the thickness of the sleepers and solidifying the crushed stone under the rails with a cement-based filler.

In the past, labor saving track construction has been performed by a machine called MTT (Multiple Tie Tamper) (vehicle dedicated to construction), and confirmation of curve finishing by MTT and finishing condition after filling construction are performed using a track measuring device. Is done. As the track measuring device, a three-wheel track measuring device in which one wheel contacts one rail and one wheel contacts the other rail and the three wheels support the main body (for example, Kaneko Co., Ltd.) Track Master KS5722B).
Moreover, as invention regarding the three-wheeled track measuring apparatus and measuring method, there exist some which are disclosed by patent document 1 and 2, for example.

Patent No. 3800548 Utility model registration No. 2573469

  A conventional three-wheeled track measuring device is provided with a measuring roller corresponding to the rolling wheel corresponding to the rolling wheel so that the side of the measuring roller contacts the predetermined position of the rail and rolls it. There is one set to. As this predetermined position, there is a position where wear occurs, for example, 16 mm from the top of the rail and the flanges of the train wheels come in contact. By bringing the measurement roller into contact with the wear occurrence point It was configured to measure rail spacing and rail distortion. Therefore, in the ballast track | truck, it was suitable in confirming the finishing state after wire maintenance operation implementation, and grasping | ascertaining the replacement | exchange time of the rail by abrasion.

However, in the case of a labor saving track, displacement of the rail is suppressed after the labor saving track construction and maintenance is not required for a long period of time, so using values measured including wear of the rail as described above, If the finished state of the track after the construction is judged, it will allow the finished part in a state deviated from the optimum position for a new rail as no problem.
As a result, when labor saving track construction is carried out, wear occurs more than a predetermined value in the rail after construction, and when it is necessary to replace it with a new rail, the rail deviates from the normal position. It became clear that there is a problem that the adjustment margin of the rail may be extremely reduced. The problem as described above occurs especially in the portion of the curve of the track where the rail tends to wear.
The present invention has been made focusing on the above-described problems, and it is possible to confirm the finished state of the track including wear when measuring the track after the work on the ballast track, and after the labor saving track work It is an object of the present invention to provide a track measuring device and a track measuring method capable of confirming whether or not the end of the track is measured at an optimum position for a new rail when measuring the track.

In order to solve the above problems, the present invention is
A frame comprising at least two rolling wheels movable on one of the two parallel rails laid on the railway track and one rolling wheel movable along the other rail;
At least two first measurement rollers whose heights are set so as to contact a portion lower by a predetermined distance from the upper surface of the one rail corresponding to the two rolling wheels;
And a second measurement roller whose height is set to contact a portion lower by a predetermined distance from the upper surface of the other rail corresponding to the one rolling wheel.
As the second measurement roller, roller units are provided at different height positions according to the types of rails to be measured, and a plurality of replacement rollers configured to be detachable at a predetermined site of the frame are provided.
The height of any one of the two first measurement rollers and the plurality of replacement rollers is set in accordance with a predetermined portion defined in a range where wear occurs on the rail due to contact with the wheel, and the other The replacement roller was set to a height capable of contacting the lower side of the rail head.

  According to the track measuring apparatus having the above-described configuration, one of a plurality of replacement rollers having different lengths is selected and used according to the type of rail to be measured and the purpose of measurement. Therefore, when measuring the track after construction in the ballast track, it is possible to confirm the finished state of the track including wear, and at the time of track measurement after labor saving track construction, the optimum position for a new rail You can check if it is finished or not.

Preferably, any one of the other replacement rollers is set to a height that can contact the lower portion of the side of the rail head and not contact the joint plate on the side of the rail.
According to this configuration, even when the rail to be measured is a fixed-sized rail, highly accurate trajectory measurement can be performed without being disturbed by the joint plate.

Furthermore, desirably, the plurality of replacement rollers are a roller portion supported by a bearing, and an external thread portion that can be screwed into a screw hole provided on a predetermined portion of the frame opposite to the roller portion. And a length adjusting portion provided between the male screw portion and the roller portion,
An engagement portion capable of engaging with a predetermined tool is formed on the outer peripheral surface of the length adjustment portion.
As a result, the replacement roller can be easily attached and detached for easy replacement, and since the plurality of types of replacement rollers have a simple configuration, the manufacturing cost can be reduced.

Preferably, the frame includes a first frame elongated in one direction, a second frame extending perpendicularly to the first frame, and an extendable / contractible rod provided at a distal end portion of the second frame. A pedestal provided at the tip of the rod, and biasing means for biasing the rod in the extension direction,
The two rolling wheels and the two first measurement rollers are mounted on the first frame, and the one rolling wheel and the second measurement roller are mounted on the pedestal.
According to this configuration, the rail interval can be measured only by detecting the amount of expansion and contraction of the rod.

Another invention of the present application is
At least two rolling wheels in contact with one of the two parallel rails laid on the railway track, two first measuring rollers and one rolling wheel in contact with the other rail, and A frame having two measurement rollers, and a roller portion at different height positions according to the type of the rail to be measured, as the second measurement roller, are configured to be detachable at a predetermined portion of the frame A plurality of replacement rollers, and any one of the first measurement roller and the plurality of replacement rollers is high according to a predetermined portion defined in a range where the rail wears due to contact with a wheel In the track measuring method using the track measuring device in which the height is set and the other replacement rollers are set at a height that can contact the lower side of the side of the rail head,
In track measurement after maintenance work construction work, the exchange roller whose height is set according to the predetermined part specified in the range where wear occurs in the rail due to contact with the wheel is attached as the second measurement roller and Measure
In track measurement after labor saving track construction construction, while attaching the exchange roller set in height according to the type of the rail to be measured as the second measurement roller, at least in the curved part of the track The track measuring device such that the two rolling wheels and the two first measuring rollers contact the curved inner rail and the one rolling wheel and the second measuring roller contact the curved outer rail It is placed on top to measure the gauge.

  According to the track measurement method as described above, it is possible to confirm the finished state of the track including wear when measuring the track after construction in the ballast track, and also to the rail of the portion where the track is curved However, in track measurement after labor saving track construction, it is possible to check whether or not it is finished at the optimum position for a new rail.

  According to the present invention, it is possible to confirm the finished state of the track including wear when measuring the track after construction in the ballast track, and to determine the optimum position for a new rail when measuring after the labor saving track construction. It is possible to realize an orbit measuring device and an orbit measuring method capable of confirming whether or not it is finished.

The track measurement apparatus which concerns on one Embodiment of this invention is shown, (A) is a top view, (B) is a front view. It is a perspective view which shows the structure of the roller apparatus of the sub-frame (one wheel shaft) front-end | tip part of the track | orbit measurement apparatus of embodiment. It is a side view which shows the state which looked at the roller apparatus of FIG. 2 from the front end side, ie, the right side of FIG. It is a perspective view which shows the structure of the roller apparatus of the front-end | tip part of the main frame (2 wheel side flame | frame) of the track | orbit measurement apparatus of embodiment. It is a figure which shows the detail of the roller for replacement | exchange of the roller apparatus of the sub-frame (one wheelset) tip part of the track | orbit measurement apparatus of embodiment. The state of the contact with the measurement roller of a sub-frame (one wheelset) tip part and rail in the track measuring device of an embodiment is shown, (A) is a figure at the time of using a roller, (B) is a normal roller FIG. 7C is a view in the case of using a longer roller, and FIG. 7C is a view in the case of using a roller longer than a normal roller in a fixed rail having a joint plate. The method of using the track | orbit measurement apparatus of embodiment is shown, (A) is a top view which shows a mode that the track | orbit measurement apparatus was mounted in the curve location of a track, (B) is a measurement roller and rail in that case. (C) is a figure which shows the mode of the contact of the roller for measurement, and a rail in, when the track | orbit measurement apparatus is mounted right-left reversely with the thing of (A).

Hereinafter, an embodiment of a trajectory measuring device according to the present invention and a method of trajectory measuring operation using the device will be described in detail with reference to the drawings.
FIG. 1 shows a track measurement apparatus according to the present embodiment, wherein (A) is a plan view and (B) is a front view. Note that the track measurement by the track measurement apparatus of the present embodiment can be applied to a track consisting of a fixed rail having a length such as 25 m or 50 m and a track consisting of a long rail having a length of 200 m or more. it can. Moreover, the rail used as the object of track measurement in this embodiment includes a 50N rail, a 60K rail, and the like.

  The track measuring apparatus according to the present embodiment has a function of measuring the degree of undulation and vertical displacement of the rail in the lateral direction, in addition to the track space, that is, the rail interval, and along the curve of the track, not to mention straight rails. It can also be used to measure the track of a curved rail being laid. The means for realizing the function of measuring the gauge and the waviness in the lateral direction and the vertical displacement is the same as that of the conventional track measuring apparatus, and therefore the detailed explanation of the principle of the measuring function and the specific configuration of the measuring instrument is omitted.

As shown in FIG. 1A, the track measuring apparatus 10 according to the present embodiment has a frame structure that is substantially T-shaped as a whole, and two wheels roll on one of the two rails. It is a three-wheeled track measurement device configured to roll one wheel on the other rail. Hereinafter, in the present embodiment, the frame 11A corresponding to the arm of the T-shaped frame 11 is referred to as a main frame, and the frame 11B corresponding to the leg is referred to as a sub-frame.
The main frame 11A is provided with a pair of roller devices 12A and 12B that roll on one rail at both ends, and a roller device 12C that rolls on the other rail is provided at the end of the sub frame 11B. There is. In addition, a roller device 12D having a roller 26c for measuring the displacement is provided on the central lower surface of the main frame 11A, and a data collection device 20 for collecting measurement data is mounted on the base side of the sub frame 11B. An apparatus placement unit 11C is provided.

A rod 13 biased in an outward direction (right direction in FIG. 1) by a built-in compression spring or the like is attached to an end portion of the sub-frame 11B so as to be expandable and contractible. There is provided a pedestal 14 for holding the roller device 12C.
The subframe 11B is provided with a measuring device capable of measuring the amount of expansion and contraction of the rod 13, and the roller device 12C and the roller devices 12A and 12B on the main frame 11A side have rail side portions as described later. The measuring rollers (26a, 26b) in contact with the roller are provided, and the gauge (rail spacing) can be calculated from the amount of expansion and contraction of the rod 13 with the measuring rollers (26a, 26b) as a base point.
In addition, the roller device 12D at the center lower surface of the main frame 11A is provided with a spring that biases the measurement roller 26c toward the rail side surface and a displacement sensor (both not shown) that detects the displacement amount. The displacement amount of the rail can be measured from the detected displacement amount of. In addition, since the measurement principle of a rail gauge and the measurement principle of a displacement amount are the same as the method (for example, refer patent document 2) currently implemented with the well-known gauge measurement apparatus, detailed description is abbreviate | omitted.

Further, the receiving stand 14 is provided with a brake device (not shown) for blocking or releasing the rolling of the roller device 12C. Also, at a position slightly near the tip of the center of the sub-frame 11B, the end of the push rod 15 for applying a force to move the entire device along the rail is rotatably coupled by a universal joint 16.
The other end of the hand rod 15 is provided with the operation handle 15a of the brake device, and between the operation handle 15a and the pedestal 14, the force acting on the operation handle 15a is transmitted to the brake device A cable 17 for transmission is provided, and the brake is released when the handle 15a is gripped, and the brake is applied by the force of a spring built in the brake device when the handle 15a is released.

2 and 3 show details of the roller device 12C at the tip of the sub-frame 11B in the trajectory measuring apparatus of FIG. Among these, FIG. 2 is a perspective view of the roller device 12C, and FIG. 3 is a side view of the roller device 12C as viewed from the front end side (right side of FIG. 1).
In FIG. 2, reference numeral 11 B is a sub-frame, and reference numeral 13 is an expandable rod. A pedestal 14 for holding the roller device 12 C is provided at the tip of the rod 13. A rolling wheel 18 in contact with the upper surface of the rail is rotatably mounted on the side surface of the pedestal 14 about the horizontal axis, and a pair of measurement rollers 19a and 19b rotate on the lower surface of the pedestal 14 about the vertical axis. It is mounted freely. The rolling wheel 18 and the measuring rollers 19a and 19b each incorporate a bearing.

In the present embodiment, a roller device 12C is configured by the receiving stand 14, the rolling wheels 18, and the measurement rollers 19a and 19b. The number of measurement rollers 19a and 19b may be one for the measurement function, but the provision of two improves the running stability.
Further, as shown in FIG. 3, the brake device 21 and the cable holding bracket 22 are mounted on the upper surface of the receiving table 14, and one end of the cable 17 is fixed to the brake device 21 by a bolt 23. The brake device 21 incorporates a brake pad and a spring. The cable holder 22 is formed in a reverse U-shape to hold the cable 17 movably. Furthermore, a handle 24 used when lifting the device is provided on the side surface of the pedestal 14 and above the rolling wheel 18.

  The detail of roller apparatus 12A of the front-end | tip part of the main flame | frame 11A in the track | orbit measurement apparatus of FIG. 1 is shown by FIG. In FIG. 4, reference numeral 11A denotes a main frame, and a roller device 12A is mounted on the lower surface of the tip end portion of the main frame 11A. Specifically, a pedestal 25 is fixed to the lower surface of the tip end portion of the main frame 11A, and a measurement roller 26a is rotatably mounted on the lower surface of the pedestal 25 around the vertical axis. A rolling wheel 27 in contact with the upper surface of the rail is mounted rotatably on the side surface about a horizontal axis. The auxiliary rollers 28a and 28b may be provided on both sides of the measurement roller 26a.

In the present embodiment, a roller device 12A is configured by the receiving stand 25, the rolling wheels 27, and the measuring roller 26a. The roller device 12B provided at the opposite end of the main frame 11A and the roller device 12D provided at the center in the longitudinal direction of the main frame 11A are configured in the same manner as the roller device 12A. Omit. The roller device 12D is provided with a measurement roller 26c (see FIG. 1) similar to the measurement roller 26a.
As described later, the measurement rollers 26a and 26b (not shown) of the roller devices 12A and 12B and the measurement roller 26c at the center of the frame function as a measurement reference point. In particular, the central measurement roller 26c can act as a measurement reference point when the rail to be measured is a curved portion. The measurement roller 26c may be omitted, and the curve distance of the rail may be detected to correct the distance between tracks (the amount of expansion and contraction of the rod 13) measured according to the curvature.

Next, the details of the measurement rollers 19a and 19b of the roller device 12C and the measurement rollers 26a, 26b and 26c of the roller devices 12A, 12B and 12D in the track measuring device of the present embodiment will be described.
In the track measuring apparatus of the present embodiment, as the measurement rollers 19a and 19b of the roller device 12C, in addition to the normal rollers used in the conventional device shown in FIG. 5A, FIGS. As shown in D), three types of replacement rollers having different lengths from the normal rollers are prepared. In the rollers shown in FIGS. 5A to 5D, the lengths of the roller portion 31 at the lower end and the external thread portion 32 at the upper end are the same, and the intermediate portion 33 between the roller portion 31 and the external thread portion 32 Are designed to have different lengths, and are formed on the outer periphery of the intermediate portion 33 in the same shape as a hexagonal bolt, and when attached to or removed from the pedestal 14, It is configured to be removable by engaging and rotating a (spanner).

  More specifically, the replacement rollers shown in FIGS. 5 (B) to 5 (D) are used when confirming the finish of the rail after the construction of a labor saving track, and the second shortest FIG. 5 (B) is replaced The roller for measurement is used when the measurement target is a 50N fixed-length rail, and the replacement roller for the second longest shown in FIG. 5C is used when the measurement target is a 60K-sized measurement rail, and the longest drawing The replacement roller shown in 5 (D) is used when the object to be measured is a long rail. On the other hand, the measurement rollers 26a, 26b and 26c of the roller devices 12A, 12B and 12D on the main frame 11A side are set to have the same height as the normal roller shown in FIG. 5A which is the shortest. The normal roller shown in FIG. 5 (A) is used when confirming the finish of the rail after the completion of the track keeping operation of the ballast track as in the prior art. The reason for preparing three types of replacement rollers will be described below.

The normal rollers shown in FIG. 5A and the measurement rollers 26a, 26b and 26c on the main frame 11A side are, for example, 16 mm from the top of the rail 1 as shown in FIG. The heights of the rollers are set so that the sides are in contact. This is because, when the rail wears due to contact with the flanges of the train wheels, adjustment is performed so that the track at a distance of 16 mm from the upper surface of the rail 1 becomes a predetermined distance in the track keeping operation of the ballast track. is there.
On the other hand, when the work to change the ballast track to a power saving track is carried out, if the finished state is confirmed by the conventional track measuring device equipped with the above-mentioned normal roller, as described above, the rail is worn more than a predetermined value As a result, there is a need to replace the rail with a new one, and when replacing the rail, the rail deviates from the normal position, and the adjustment allowance of the laid rail becomes extremely small.

  The present inventors used a measurement roller that contacts the side of the head of the rail where no wear occurs, as shown in FIG. 6 (B), when measuring the gauge after installation of the labor saving track construction. It was examined to do the measurement. As a result, the measurement roller should be in contact with the less worn part of the head side of the rail as much as possible, and although highly accurate measurement results can be obtained, the track that is currently the object of labor saving track construction There are three types of tracks on which 50N long rails and 60K long rails and long rails are laid. If the height of the measurement roller is set for the long rail among them, in the 50N and 60K size rails, a reinforcing plate called a joint plate is connected to the connection portion of the rail and the rail. Since the bolt is fastened to the side by a bolt, the height of the measuring roller is too high, and as shown in FIG. 6C, the roller 19 interferes with the joint plate 2 and high-precision measurement can be performed. I found it was not.

Therefore, as described above, the replacement roller used for measurement of the 50N long rail shown in FIG. 5B, and the replacement roller used for measurement of the 60K wide rail shown in FIG. 5C, It was decided to prepare replacement rollers used for long rail measurement shown in 5 (D). Specifically, the height of the replacement roller in FIG. 5 (B) is set to contact the rail side at a position 26 mm lower than the rail top, and the replacement roller in FIG. 5 (C) is 36 mm below the rail top The height is set to contact the rail side at the position, and the replacement roller shown in FIG. 5D is set to contact the rail side at a position 46 mm lower than the rail upper surface.
In addition, since there is also a track requiring maintenance work as it is, the roller whose head side is in contact with the portion 16 mm from the upper surface of the rail is also left as a replaceable normal roller.

Next, how to use the trajectory measurement apparatus of the above embodiment will be described.
First, in track measurement after track maintenance construction of a ballast track, a normal roller shown in FIG. 5A as measurement rollers 19a and 19b on the pedestal 14 at the tip of the subframe 11B of the track measurement device 10 of the above embodiment. Attach and measure. At this time, the measurement rollers 26a, 26b, and 26c on the main frame 11A side are the same as the normal rollers shown in FIG. 5A, so that the head side portion contacts 16 mm from the upper surface of the rail. The height is set.

  By placing the track measurement device with the measurement roller set as above on the rail of the track after construction work and moving it, measure the displacement between the track and the right and left while measuring the displacement of the train. Even if the rail is worn out due to the contact of the wheel flange portion, it is possible to confirm the finished state of the rail after the wire keeping operation including the occurrence of the wear. In addition, in the case of this track measurement, even if measurement rollers 26a, 26b and 26c on the main frame 11A side are placed on either of the left and right rails on the straight part of the track or of course the curve part It will be almost the same.

  Next, in track measurement after labor saving track construction, types of rails of a track to be constructed as measurement rollers 19a and 19b on the pedestal 14 at the tip of the sub frame 11B of the track measurement device 10 of the above embodiment. In accordance with the above, measurement is performed by attaching the replacement roller in any one of FIGS. 5 (B), (C), and (D). At this time, the measurement rollers 26a, 26b, and 26c on the main frame 11A side are the same as the normal rollers shown in FIG. 5A, so that the head side portion contacts 16 mm from the upper surface of the rail. The height is set.

  By placing the track measurement device with the measurement roller set as above on the rail of the track after the construction of labor saving track construction and moving it, measure the displacement of the track or the left and right while measuring the vertical displacement. Even if the rail is worn due to the contact of the flanges of the train wheels, the finished state of the rail can be confirmed. Specifically, after installation, the rail wears more than a predetermined value, and it is necessary to replace it with a new rail. When replacing the rail, the rail deviates from the normal position, and the adjustment margin of the laid rail is extremely small. It can be checked whether or not it is in a finished state where it can be avoided.

  In addition, in the case of track measurement after this labor saving track construction construction, the measurement obtained by placing the roller devices 12A, 12B, 12D on the main frame 11A side on either of the left and right rails There is no problem because the values become the same, but as shown in FIG. 7 (A), the roller devices 12A, 12B, 12D on the main frame 11A side are placed on the curve inner rail 1A and measured I do. The reason is that, as shown in FIG. 7C, wear F is generated inside the curved outer rail 1B at the curved portion of the track as shown in FIG. 7C, so the roller device 12A on the main frame 11A side , 12B are placed on the curve outer rail 1B and measurement is performed, the measurement rollers 26a, 26b, and 26c contact the worn portion, so that the gauge may be measured including wear.

  On the other hand, when the roller devices 12A, 12B, 12D on the main frame 11A side are placed on the curve inner rail 1A and measurement is performed, as shown in FIG. 7B, any measurement roller 26a, 26b, 26c also contacts the non-abrasive portion of the rail for measurement, so that the desired measurement result can be obtained. Therefore, in the case of track measurement after labor saving track construction construction, it is necessary to place the roller devices 12A, 12B and 12D on the main frame 11A side on the curve inner rail 1A and measure at least at the curved part of the track. .

  Even in the straight portion of the track, wear may occur on the rail due to a slight inclination of the track surface or the like. However, even in such a case, it is common that wear occurs in only one rail at the same place. Therefore, in this case, the track measuring device may be mounted and the measurement may be performed so that the roller devices 12A and 12B on the main frame 11A side come to the rail where the wear is not generated. After that, when replacing with a new rail, it is possible to avoid that the rail deviates from the normal position and the adjustment margin of the laid rail becomes extremely small.

As mentioned above, although this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment, In the range which does not deviate from the summary of invention, it can change suitably. For example, in the above embodiment,
In the above embodiment, four types of replacement rollers having different lengths are prepared, and the measurement rollers 19a and 19b at the tip of the sub frame are detachably attached. 19a and 19b may be configured to be movable in the height direction with respect to the receiving table 14, and measurement may be performed by adjusting the height of the measurement roller according to the type of rail to be measured. Further, the replacement rollers are not limited to four types, and may be prepared according to the type of rail to be measured.

DESCRIPTION OF SYMBOLS 10 Trajectory measurement apparatus 11 Frame 11A Main frame 11B Subframe 12A, 12B, 12C, 12D Roller apparatus 13 Rod 14 Receiving stand 15 Hand stick 15a Operation handle
16 universal joint 17 cable 18 rolling wheel 19a, 19b measuring roller 20 data acquisition device 21 brake device 26a, 26b, 26c measuring roller 27 rolling wheel

Claims (5)

A frame comprising at least two rolling wheels movable on one of the two parallel rails laid on the railway track and one rolling wheel movable along the other rail;
At least two first measurement rollers whose heights are set so as to contact a portion lower by a predetermined distance from the upper surface of the one rail corresponding to the two rolling wheels;
And a second measurement roller whose height is set to contact a portion lower by a predetermined distance from the upper surface of the other rail corresponding to the one rolling wheel,
As the second measurement roller, roller units are provided at different height positions according to the types of rails to be measured, and a plurality of replacement rollers configured to be detachable at a predetermined site of the frame are provided.
The height of any one of the two first measurement rollers and the plurality of replacement rollers is set in accordance with a predetermined portion defined in a range where wear occurs on the rail due to contact with the wheel, and the other A track measurement device characterized in that the replacement roller is set to a height that can contact the lower side of the rail head.   The height of any one of the other replacement rollers is set so as to be in contact with the lower portion of the side surface of the rail head and not to contact the joint plate on the side surface of the rail. Orbit measuring device. The plurality of replacement rollers are a roller portion supported by a bearing, an external thread portion which is opposite to the roller portion and can be screwed into a screw hole provided at a predetermined portion of the frame, and the external thread A length adjusting unit provided between the roller unit and the roller unit;
The track measuring device according to claim 1 or 2, wherein an engaging portion capable of engaging with a predetermined tool is formed on an outer peripheral surface of the length adjusting portion. The frame includes a first frame elongated in one direction, a second frame extending in an orthogonal direction to the first frame, a rod telescopically provided at a distal end of the second frame, and a distal end of the rod A pedestal provided on the head, and biasing means for biasing the rod in the extension direction,
The two rolling wheels and the two first measurement rollers are mounted on the first frame, and the one rolling wheel and the second measurement roller are mounted on the pedestal. The track measuring apparatus according to any one of claims 1 to 3. At least two rolling wheels in contact with one of the two parallel rails laid on the railway track, two first measuring rollers and one rolling wheel in contact with the other rail, and A frame having two measurement rollers, and a roller portion at different height positions according to the type of the rail to be measured, as the second measurement roller, are configured to be detachable at a predetermined portion of the frame A plurality of replacement rollers, and any one of the first measurement roller and the plurality of replacement rollers is high according to a predetermined portion defined in a range where the rail wears due to contact with a wheel A track measuring method using a track measuring device whose height is set and the other replacement rollers are set at a height capable of contacting the lower side of the side of the rail head,
In track measurement after maintenance work construction work, the exchange roller whose height is set according to the predetermined part specified in the range where wear occurs in the rail due to contact with the wheel is attached as the second measurement roller and Measure
In track measurement after labor saving track construction construction, while attaching the exchange roller set in height according to the type of the rail to be measured as the second measurement roller, at least in the curved part of the track The track measuring device such that the two rolling wheels and the two first measuring rollers contact the curved inner rail and the one rolling wheel and the second measuring roller contact the curved outer rail A trajectory measurement method characterized in that it is placed on top and measurement between gauges is performed.

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