JP2015112634A - Clamp jig for rail bond weld - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a clamp jig for a rail bond weld, which can measure the temperature of a rail welding face at a rail heating time and can attain a stable welding quality irrespective of the welding technique of an operator.SOLUTION: A clamp jig comprises: terminal arranging means 21, 22, 24 and 32 for arranging the terminal member 50a of a rail bond 50 on the welded face 10a of a rail 10; and a temperature sensor 26 for detecting the temperature of the welding surface of the rail, wherein the temperature sensor is arranged on the back side of the welding surface in the rail.

Description

  The present invention relates to a clamp jig for rail bond welding used when welding a rail bond to be mounted across rail joints.

Conventionally, a rail bond 50 is known which is mounted across the joint 12 of the rail 10 as shown in FIG. 11 in order to improve electrical connection between rails of the railway. The rail 10 has not only a role as a track for running the train but also a role of transmitting various signal currents or return currents for switching operation display and switching points.
However, in order to absorb thermal expansion of the rail 10 caused by direct sunlight, a gap is provided in the joint 12 between the rails, and the two are electrically separated by this gap. As shown in the drawing, the seam plate 2 is bolted to the seam 12, but the electrical resistance is large. Therefore, the electrical connection between the rails is secured by attaching a conductive rail bond 50 to the joint 12.

  As a method of attaching the rail bond 50 to the rail 10, as disclosed in Patent Document 1, a through hole is provided in a side portion of the rail, and a fixing member (bolt and lock nut) is inserted into the through hole. There are known a method for fixing the rail bond by welding and a method for fixing the rail bond to the side portion of the rail by welding.

  When the rail bond 50 is welded to the rail side portion, the metal terminal members 50a and 50b provided at both ends of the rail bond 50 are welded to the rail. As shown in FIG. 12 (only one terminal member 50a is shown in FIG. 12), the terminal members 50a and 50b include a cylindrical portion 51 for inserting and crimping the electric wire 3 into the cylindrical interior, and the cylindrical portion. 51 and a terminal portion 52 that is provided on the outer peripheral surface of the rail 51 and is fixed to the rail 10 by low-temperature welding. The terminal portion 52 is formed with a depressed internal space, and welding is performed by storing a low temperature wax in the internal space.

A conventional welding procedure will be briefly described by taking the terminal member 50a of the rail bond 50 as an example.
First, as shown in FIG. 13, the terminal member 50a is held by the wax pack 20 as a holder, and the lower end of the terminal portion 52 and the lower portion of the wax pack are pressed against the welding surface 10a on the rail side.
Next, as shown in FIG. 14A, the flame of the burner 30 is applied and heated from above the terminal portion 52 toward the rail 10. In the internal space where the terminal part 52 is depressed, the wax 11 is provided in advance, and when this is heated, it starts to accumulate in the lower part of the terminal part 52 as shown in FIG.
When the rail 10 is sufficiently heated, the melted solder 11 becomes familiar with the rail 10 and crawls up to the rail surface as shown in FIG. Thereby, the lower end of the terminal part 52 is welded and temporarily fixed to the rail surface.

Next, as shown in FIG. 14 (d), while the rod-shaped solder 15 is pressed against the rail surface, the newly melted solder 11 is poured into the internal space of the terminal portion 52, as shown in FIG. 14 (e). It is assumed that the row 11 is raised from the upper end of the terminal portion 52.
When the wax 11 in the terminal portion 52 is completely melted and stirred with a stirring rod (not shown), bubbles and the like in the wax are removed, and the wax is lowered to the height of the upper end of the terminal portion 52 as shown in FIG. 11 is stored.
Then, cooling water is applied to the periphery of the wax 11 so that the melted solder 11 is not directly exposed to the cooling water, and then the solder pack 20 is removed to complete the welding operation of the terminal member 50a.

Japanese Patent Laid-Open No. 11-144832

By the way, in the welding method, if the rail welding surface 10a is not sufficiently heated, the solder 11 is not sufficiently melted, resulting in poor welding.
However, conventionally, the determination of whether or not the rail welding surface has reached an appropriate temperature depends on the feeling of the welding operator, and when the welding operator's skill is low, the temperature of the rail welding surface becomes the appropriate temperature. There was a problem that welding failure occurred. In addition, since the welding quality greatly depends on the skill of the welding operator, there is a problem that the welding quality varies.

In order to solve the above-mentioned problem, if a temperature sensor is used to manage the temperature of the rail welding surface and the rail 10 is sufficiently heated and the braze 11 is melted, it is possible to prevent the occurrence of welding failure.
However, in the conventional welding method, when the temperature sensor is disposed on the rail welding surface, not only the flame of the burner 30 affects the temperature sensor but cannot be accurately measured, and the sensor may be burnt and damaged. There was a problem that there was.

  The present invention has been made paying attention to the above-mentioned points, and in the rail bond welding clamp jig used when welding the rail bond, the temperature of the rail welding surface at the time of rail heating can be measured. An object of the present invention is to provide a clamp jig for rail bond welding that can stably obtain high welding quality regardless of the welding technique of the operator.

In order to solve the above-described problem, the clamp jig for rail bond welding according to the present invention is a clamp jig for rail bond welding used when welding a rail bond to be mounted across a rail joint, Terminal arrangement means for arranging a terminal member of the rail bond on the welding surface of the rail, and a temperature sensor for detecting the temperature of the welding surface of the rail, the temperature sensor being on the back side of the welding surface of the rail It is characterized by being arranged in.
With this configuration, the temperature of the rail welding surface is measured by placing a temperature sensor on the rail surface on the back side of the welding surface, so there is no risk of the temperature sensor being burnt (damaged) by the flame of the burner. Also, since the flame of the burner does not affect the operation of the temperature sensor, it can be measured accurately.
Moreover, since the temperature of the welding surface can be accurately known regardless of the skill of the welding operator, it is possible to prevent the occurrence of poor welding and to stably obtain high welding quality.

The terminal arrangement means includes a pair of arms biased in a direction in which the distal end side is closed, and a terminal holding means that is provided at the distal end of one of the pair of arms and holds the terminal member. The temperature sensor is provided at the distal end of the other arm, and the terminal member and the temperature sensor respectively held at the distal ends of the pair of arms are arranged symmetrically across the rail. desirable.
In addition, it is desirable that a monitor for displaying a detection result of the temperature sensor is provided on the base end side of one of the pair of arms.

Alternatively, the terminal arrangement means is provided in the holding means for holding the bottom portion of the rail by operating a lever handle, and holds the terminal member, and the terminal member is welded to the rail. The temperature sensor may be provided on a distal end side of an arm extending from the holding means and disposed on a back surface side of the welding surface in the rail.
In that case, in the holding means, it is desirable that the lever handle is provided with a monitor for displaying a detection result of the temperature sensor.

By comprising in this way, a temperature sensor can be arrange | positioned to the back surface side of a rail welding surface, and measurement temperature can be known with a monitor.
The rail bond terminal member can be disposed by being pressed against any one of the head side portion of the rail, the abdominal portion of the rail, and the upper surface of the bottom portion of the rail by the terminal disposing means.

  According to the present invention, in the clamp jig for rail bond welding used when welding the rail bond, the temperature of the rail welding surface at the time of rail heating can be measured, which is high regardless of the welding technique of the operator. A clamp jig for rail bond welding capable of stably obtaining welding quality can be obtained.

FIG. 1 is a plan view of a clamp jig for rail bond welding according to the present invention. FIG. 2 is a plan view showing a usage state of the clamp jig of FIG. FIG. 3 is a schematic cross-sectional view of the rail head side portion showing a use state of the clamp jig of FIG. 1. FIG. 4 is a cross-sectional view for explaining a state in which the welding surface is polished in the step of welding the terminal member to the rail welding surface. FIG. 5 is a cross-sectional view for explaining a state in which a plating process is performed on the welding surface in the process of welding the terminal member to the rail welding surface. FIG. 6 is a cross-sectional view for explaining a state in which the terminal member is temporarily welded in the step of welding the terminal member to the rail welding surface. FIG. 7 is a cross-sectional view for explaining a state in which the terminal member is permanently welded in the step of welding the terminal member to the rail welding surface. FIG. 8 is a plan view showing another embodiment of the clamp jig for rail bond welding according to the present invention. FIG. 9 is a schematic cross-sectional view of the rail head side portion showing a use state of the clamp jig of FIG. 8. FIG. 10 is a cross-sectional view showing another embodiment of the clamp jig for rail bond welding according to the present invention. FIG. 11 is a side view showing a state where rail bonds are welded between rails. FIG. 12 is a plan view of a rail bond terminal member. FIG. 13 is a cross-sectional view showing a state in which the row pack holding the terminal member is arranged on the rail side surface. 14 (a) to 14 (f) are cross-sectional views of a terminal member and a wax pack holding the terminal member for explaining a conventional rail bond welding method.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a clamp jig for rail bond welding according to the present invention will be described with reference to the drawings. In this embodiment, as shown in FIG. 11, when the rail bond 50 is attached to the joint 12 of the rail 10, more specifically, one terminal member 50a of the rail bond 50 is connected to the rail head side portion (see FIG. The case of welding to the position indicated by reference numeral A in FIG. Since the welding of the other terminal member 50b is similar to the welding of the terminal member 50a, the description thereof is omitted.

FIG. 1 is a plan view of a clamp jig for rail bond welding according to the present invention. 2 is a plan view showing a usage state of the clamp jig of FIG. 1, and FIG. 3 is a schematic sectional view of the rail head side portion at that time. 1 to 3, the same or corresponding members as those shown in FIGS. 11 to 14 are denoted by the same reference numerals.
The clamp jig 1 has a pair of arms 21 and 22, and these arms 21 and 22 are rotatably supported at substantially intermediate portions thereof. In other words, inwardly-rotating support pieces 21 a and 22 a are formed in the intermediate portions of the arms 21 and 22, and their tip portions are rotatably supported by the support shaft 23.

  Further, a screw member 24 (terminal holding means) is provided at the tip of one arm 21, and this screw member 24 has a rod-like screw 24a extending inward. As shown in FIG. 2, the screw 24 a is screwed into a screw hole 20 a provided in the row pack 20, whereby the row pack 20 is held by the arm 21.

In addition, a cylindrical sensor holder 25 having a shaft tip facing inward is provided at the tip of the other arm 22, and a contact-type temperature sensor 26 is held at the tip. Similarly, a cylindrical sleeve 27 is connected to the rear end of the sensor holder 25.
At the rear end of the sensor holder 25 (the tip of the sleeve 27), a heat shield plate 28 that spreads in a bowl shape is provided. The heat shield plate 28 shields radiant heat from the welding surface 10a, and the sleeve 27 side is covered. It is designed to protect against heat during welding.

  Further, one end of a cable 31 that covers an electric signal line is connected to the temperature sensor 26, and this cable 31 passes through the inside of the sensor holder 25 and the sleeve 27 and is pulled out from the rear end of the sleeve 27. . As shown in the drawing, since the sleeve 27 is formed long in the axial direction, the cable 31 drawn out is pulled away from the welding surface 10a, and further, since the heat shielding plate 28 is provided, the sleeve 27 is drawn out. The cable 31 thus protected is protected from the radiant heat of the welding surface 10a. The other end of the cable 31 drawn from the sleeve 27 is connected to a temperature monitor 29 attached to the proximal end side of the arm 22. That is, the temperature of the temperature measurement object with which the temperature sensor 26 is in contact is displayed on the temperature monitor 29 (digital display is desirable).

Further, between the two arms 21 and 22, a spring 32 is provided on the proximal end side of the support shaft 23 to apply a biasing force in a direction in which the distal ends of the arms 21 and 22 are close to each other. ing. That is, for example, when an operator rotates the base end side of the two arms 21 and 22 in a direction close to each other (closing direction), the leading end side of the arms 21 and 22 opens with the support shaft 23 as a fulcrum. On the other hand, the tip end sides of the arms 21 and 22 are biased in the closing direction.
The arms 21 and 22, the screw member 24, the sensor holder 25, the spring 32 and the like constitute terminal arrangement means.

When the terminal member 50a of the rail bond 50 is fixed to the rail side surface (welded surface 10a) by such a clamp jig 1, the lower end of the terminal portion 52 and the lower side surface of the row pack 20 are connected to the rail head side portion as shown in FIG. It is made to contact | abut to the welding surface 10a.
Next, the base end side of the pair of arms 21 and 22 is closed by hand to widen the distance between the tip ends of the arms 21 and 22, and the temperature sensor 26 on the tip end side of the arm 22 is opposite to the welding surface 10a of the rail head. It is made to contact | abut to the side surface (back side).
Then, the screw 24 a of the screw member 24 on the distal end side of the arm 21 is rotated and screwed into the screw hole 20 a of the wax pack 20 to be fixed. Further, the base end sides of the arms 21 and 22 are released from the hands, and the both sides of the rail head are sandwiched between the distal ends of the arms 21 and 22 by the biasing force of the spring 32. Thus, the wax pack 20 is pressed against the side surface (welded surface 10a) of the rail head by the arm 21, and is fixed to the welded surface 10a. On the other hand, the temperature sensor 26 is similarly fixed to the back surface side of the welding surface 10 a by the arm 22.

Then, the process of welding the terminal member 50a of the rail bond 50 to the rail 10 using the said clamp jig | tool 1 is demonstrated.
First, as shown in FIG. 4, the welding surface 10a of the rail 10 and its periphery are grind | polished with a grindstone, and a rail ground surface is exposed. This is performed to improve the adhesion between the rail 10 and the solder. In FIG. 4, the polished weld surface 10a is exaggerated for the sake of understanding.
Next, as shown in FIG. 5, the flame of the burner 30 is applied to the welding surface 10 a in the rail 10. Then, the temperature sensor 16 is brought into contact with the side surface (back surface side) opposite to the welding surface 10a of the rail head, and the welding surface 10a reaches a predetermined temperature (for example, 200 ° C.) or higher while checking the temperature display on the monitor 17. Until heated. Here, since this is a process before the solder jig 20 is fixed by the clamp jig 1, the temperature sensor 16 and the monitor 17 other than the temperature sensor 26 and temperature monitor 29 of the clamp jig 1 are used. did. However, the temperature sensor 26 and the temperature monitor 29 provided in the clamp jig 1 may be used without being limited thereto.
When the temperature of the welded surface 10a reaches a predetermined temperature, the rod-shaped braze 15 is applied to the welded surface 10a, and the molten braze 11 is thinly applied to perform plating. By this pre-plating process, the base of the welding surface 10a is formed.

  When the base of the welding surface 10 a is formed, the terminal member 50 a is set on the solder pack 20 as shown in FIG. 6, and the solder pack 20 is placed on the welding surface 10 a of the rail 10 by the clamp jig 1. Thereby, the temperature sensor 26 is brought into contact with the surface (back surface side) opposite to the welding surface 10a in the rail head portion.

When the wax pack 20 is arranged on the welding surface 10a by the clamping jig 1, the flame of the burner 30 is applied to the welding surface 10a as shown in FIG. 7, and the temperature of the welding surface 10a is confirmed while the temperature monitor 29 checks the temperature of the welding surface 10a. Heat until a predetermined temperature (for example, 200 ° C.) is reached.
When the temperature of the welding surface 10a becomes equal to or higher than a predetermined temperature (200 ° C.), the solder 11 in the terminal portion 52 of the terminal member 50a is melted to the state shown in FIG. 14C, and the lower end of the terminal portion 52 is temporarily welded. Is done.

Subsequently, the welding surface 10a of the rail 10 is heated by the burner 30, and the temperature of the welding surface 10a is maintained at a predetermined temperature (for example, 200 ° C.) or higher, and the tip of the rod-shaped solder 15 is pressed against the welding surface 10a to be melted. To do. Then, as shown in FIG. 7, the melted solder 11 is poured into the internal space of the terminal portion 52 and main welding is performed. Here, as shown in FIG. 14E, when the wax 11 is raised from the upper end of the terminal portion 52 and the wax 11 in the terminal portion 52 is stirred with a stirring rod (not shown), Bubbles and the like are removed, and the wax 11 is stored up to the height of the upper end of the terminal portion 52 as shown in FIG.
Then, cooling water is poured around the solder 11 so that the melted solder 11 is not directly exposed to cooling water, and then the solder pack 20 is removed to complete the welding operation of the terminal member 50a.

As described above, according to the embodiment of the present invention, the temperature of the welding surface 10a of the rail 10 is measured by bringing the temperature sensor 26 into contact with the rail surface on the back side of the welding surface 10a. Since there is no possibility that the temperature sensor is burned (damaged) and the flame of the burner 30 does not affect the operation of the temperature sensor 26, accurate measurement can be performed.
Moreover, since the temperature of the welding surface 10a can be accurately known regardless of the skill of the welding operator, it is possible to prevent the occurrence of poor welding and to stably obtain high welding quality.

In the above-described embodiment, the case where the rail bond 50 is attached to the rail head side portion (position A in FIG. 11) has been described as an example. However, in the clamping jig of the present invention, Not only the mounting position but also the rail abdomen (position B in FIG. 11) or the top surface of the rail bottom (position C in FIG. 11) can be used suitably.
For example, when attaching to the rail abdomen, the shape of the clamp jig 1 shown in the plan view of FIG. 8 is obtained. The main difference from the configuration of FIG. 1 is the length L1 in the axial direction of the sensor holder 25 that holds the temperature sensor 26, and the length L2 in the axial direction of the sleeve 27.

That is, the length L1 extending inward of the sensor holder 25 attached to the tip of the arm 22 is formed to be longer, so that the temperature sensor 26 can be brought into contact with the rail abdomen without difficulty as shown in FIG. Is possible.
In the case of this configuration, the cable 31 connected to the temperature sensor 26 and passed through the sensor holder 25 can be pulled out at a position away from the welding surface 10 a depending on the length of the sensor holder 25. May be formed short, and the heat shield plate 28 as shown in FIG. 1 is not necessary.

  Moreover, in the said embodiment, although it was set as the clamp jig | tool of the type which clamps the rail 10 with the two arms 21 and 22, in this invention, it is not limited to it, For example, it shows in FIG. Such a bottom-fixed clamping jig 1 may be used.

That is, the clamping jig 1 shown in FIG. 10 includes a base portion 33, a side surface holding portion 34 that comes into contact with the side surface of the rail bottom portion, and a bottom surface holding portion 35 that comes into surface contact with the rail bottom surface. Both the side surface holding portion 34 and the bottom surface holding portion 35 are supported on the distal end side of the base portion 33. In addition, an upper lever handle 41 is provided on the base portion 33 so as to be rotatable in the vertical direction via a link member 37 above the base portion 33, and fixed to press the top surface of the rail bottom portion from above. A member 38 is provided.
A lower lever handle 42 is rotatably connected to the lower portion of the upper lever handle 41 by a support shaft 36. A lower end 42 a of the lower lever handle 42 is in contact with the base portion 33.

When the upper lever handle 41 is pushed downward with the support shaft 36 as a fulcrum, the link member 37 rotates with the support shaft 37a as a fulcrum, thereby moving the fixing member 38 downward. Therefore, when the upper lever handle 41 is pushed downward with the support shaft 36 as a fulcrum in a state where the side surface holding portion 34 is in contact with the side surface of the rail bottom portion and the bottom surface holding portion 35 is in surface contact with the rail bottom surface, the fixing member 38 The upper surface of the rail bottom is pressed.
That is, the clamp jig 1 shown in FIG. 10 is configured to be fixed to the rail bottom portion by the side surface holding portion 34, the bottom surface holding portion 35, and the fixing member 38 as nipping means. The holding means further includes the base 33, an upper lever handle 41, a lower lever handle 42, and the like.

  On the other hand, when the upper lever handle 41 and the lower lever handle 42 are gripped, the upper lever handle 41 is relatively lifted upward with the support shaft 36 as a fulcrum, and the link member 37 rotates with the support shaft 37a as a fulcrum. As a result, the fixing member 38 moves upward and is separated from the upper surface of the rail bottom (released by pressing).

A shaft bar 43a (pressing means) of the screw member 43 is inserted into the upper portion of the side surface holding portion 34 so as to be able to advance and retreat with respect to the rail abdomen. A screw 43b is provided at the tip of the shaft rod 43a. When the screw 43b is screwed into the row pack 20, the row pack 20 is held at the tip of the shaft rod 43a.
The shaft bar 43a is urged in a forward direction by a spring mechanism (not shown) provided in the side surface holding portion 34. When the clamp jig 1 is fixed to the rail bottom, the shaft bar 43a The wax pack 20 held at the tip is pressed and fixed to a predetermined position (welded surface) of the rail abdomen.

Further, a base end side of a U-shaped arm 45 is slidably attached to the bottom surface holding portion 35 in a horizontal direction, and a temperature sensor 26 held by a sensor holder 25 is provided at the tip of the arm 45. . The temperature sensor 26 is symmetrically disposed on the surface (back surface side) opposite to the surface (welding surface 10a) on which the wax pack 20 is disposed in the rail abdomen, and the rail welding surface 10a is brought into contact with the rail abdomen. It is designed to detect the temperature.
A temperature monitor 29 that displays the temperature detected by the temperature sensor 26 is provided on the rear end side of the upper lever handle 41.

According to the clamp jig 1 configured in this way, the temperature of the welding surface 10a of the rail 10 is measured by bringing the temperature sensor 26 into contact with the rail surface on the back side of the welding surface 10a, as in the configuration of FIG. Will be.
Therefore, there is no possibility that the temperature sensor 26 is burnt (damaged) by the flame of the burner 30 and the flame of the burner 30 does not affect the operation of the temperature sensor 26, so that accurate measurement can be performed.
Moreover, since the temperature of the welding surface 10a can be accurately known regardless of the skill of the welding operator, it is possible to prevent the occurrence of poor welding and to stably obtain high welding quality.
Note that the configuration of the bottom-fixed clamping jig 1 shown in FIG. 10 is an example, and the present invention is not limited thereto. That is, as long as the temperature sensor 26 can be fixed to the back surface side of the rail surface (welded surface 10a) to which the wax pack 20 is fixed, other bottom fixed type configurations can also be employed.

  Further, according to the embodiment, the temperature monitor 29 is simply configured to display the temperature. However, the present invention is not limited to this, and the monitor 29 displays whether or not the detected temperature has reached the predetermined temperature (for example, OK and OK). NG etc.).

DESCRIPTION OF SYMBOLS 1 Clamp jig 2 Seam plate 3 Electric wire 10 Rail 10a Welding surface 11 Row 12 Seam 15 Row 20 Row pack 21 Arm (terminal arrangement means)
22 Arm (terminal arrangement means)
24 Screw member (terminal holding means, terminal arrangement means)
24a Screw part 25 Sensor holder 26 Temperature sensor 27 Sleeve 28 Heat shield plate 29 Temperature monitor 30 Burner 32 Spring (terminal arrangement means, terminal arrangement means)
33 Base part (holding means, terminal arrangement means)
34 Side holding part (holding means, terminal arrangement means)
35 Bottom holding part (clamping means, terminal arrangement means)
37 Link member 38 Fixing member (clamping means, terminal arrangement means)
41 Upper lever handle (holding means, terminal arrangement means)
42 Lower lever handle (holding means, terminal arrangement means)
43 Screw member (terminal arrangement means)
43a Shaft bar (pressing means, terminal arrangement means)
43b Screw 45 Arm 50 Rail bond 50a Terminal member 50b Terminal member 52 Terminal part

Claims (6)

A clamp jig for rail bond welding used when welding a rail bond to be installed across a rail joint,
Terminal arrangement means for arranging the rail bond terminal member on the rail welding surface;
A temperature sensor for detecting the temperature of the welding surface of the rail,
The temperature sensor is disposed on the back side of the welding surface of the rail, and is a clamp jig for rail bond welding. The terminal arrangement means includes
A pair of arms biased in a direction in which the distal end side is closed; and a terminal holding means for holding the terminal member provided at the distal end of one of the pair of arms;
The temperature sensor is provided at the tip of the other arm,
2. The clamp for rail bond welding according to claim 1, wherein the terminal member and the temperature sensor respectively held at the ends of the pair of arms are arranged symmetrically with the rail interposed therebetween. jig.   The clamp jig for rail bond welding according to claim 2, wherein a monitor for displaying a detection result of the temperature sensor is provided on either one of the pair of arms. The terminal arrangement means includes
Clamping means for clamping the bottom of the rail by operating a lever handle;
A pressing means provided on the holding means and holding the terminal member and capable of pressing the terminal member against the welding surface of the rail;
2. The clamp for rail bond welding according to claim 1, wherein the temperature sensor is provided on a distal end side of an arm extending from the holding means and is disposed on a back surface side of the welding surface of the rail. jig.   5. The clamp jig for rail bond welding according to claim 4, wherein in the holding means, the lever handle is provided with a monitor for displaying a detection result of the temperature sensor.   The terminal member of the rail bond is pressed and arranged on any of the head side portion of the rail, the abdominal portion of the rail, and the upper surface of the bottom portion of the rail by the terminal arrangement means. The clamp jig for rail bond welding as described in any one of claim | item 5.

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