Rail Fastening Device

Abstract

To provide a rail fastening device that can further ensure insulation properties between rails and supporting bodies.SOLUTION: A rail fastening device according to one embodiment includes a rail receiving part on which a rail is placed, and a plate body that has a pair of side parts located on both sides of the rail receiving part in a second direction perpendicular to a first direction, which is the longitudinal direction of the rail. The material of the plate body is fiber reinforced plastic with insulation properties, the plate body has a first fiber-reinforced plastic area, the material of the first fiber-reinforced plastic area is fiber-reinforced plastic with insulation properties, and the first fiber-reinforced plastic area includes multiple fiber reinforced materials oriented in the first direction, multiple fiber reinforced materials oriented in the second direction and matrix resin.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rail fastening device. [Background technology]

[0002] Railway track facilities are equipped with track circuits that detect vehicles by electrically shorting two rails (left and right) at the vehicle axles (wheels and axles) to prevent vehicle (train) collisions and derailments and ensure safe and efficient vehicle operation. For this reason, rail fastening devices are required to provide electrical insulation between the rail and the bearing. For this reason, an insulating plate is placed below the rail fastening device to provide electrical insulation between the rail and the bearing (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-179073 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the insulating performance between the rail and the support can be reduced by dust on the surface of the insulating plate and deterioration due to the environment, resulting in a short circuit between the two rails even when there are no vehicles present, which can cause transportation disruptions.

[0005] Therefore, an object of the present invention is to provide a rail fastening device that can more reliably ensure insulation between the rail and the support body. [Means for solving the problem]

[0006] (1) A rail fastening device according to one aspect of the present invention comprises a plate body having a rail receiving portion on which a rail is placed and a pair of side portions located on both sides of the rail receiving portion in a second direction perpendicular to a first direction that is the longitudinal direction of the rail, wherein the material of the plate body is an insulating fiber reinforced plastic, the plate body has a first fiber reinforced plastic region, the material of the first fiber reinforced plastic region is an insulating fiber reinforced plastic, and the first fiber reinforced plastic region has a first fiber reinforced plastic region containing a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in the second direction, and a matrix resin.

[0007] In this rail fastening device, the plate body is made of an insulating fiber-reinforced plastic, so the plate body itself is insulating. Therefore, when the plate body is fixed to a support body with the rail supported by the rail receiving portion, the insulating distance between the rail and the support body becomes longer. As a result, the insulation between the rail and the support body can be further ensured. Because the plate body is made of a fiber-reinforced plastic, mechanical resistance (strength, etc.) against forces acting on the plate body during vehicle travel can be ensured. Fiber-reinforced plastic has better mechanical properties in the direction in which the fiber reinforcing material contained in the fiber-reinforced plastic is oriented. The rail fastening device of (1) above has a first fiber-reinforced plastic region that includes a plurality of fiber reinforcing materials oriented in the first direction and a plurality of fiber reinforcing materials oriented in the second direction. Therefore, mechanical resistance (strength, etc.) against forces acting in the first and second directions that occur during vehicle travel, etc. can be further ensured.

[0008] (2) In the rail fastening device of (1) above, the volume resistivity of the fiber reinforced plastic is 10 8 The resistance may be Ω·m or more, which can further ensure insulation between the rail and the bearing.

[0009] (3) In the rail fastening device of (1) or (2) above, the plate body may further have a second fiber reinforced plastic region, the material of which is an insulating fiber reinforced plastic, and the second fiber reinforced plastic region may have a second fiber reinforced plastic region containing a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in a third direction perpendicular to the first direction and the second direction, and a matrix resin.

[0010] The rail fastening device of (3) above has, in addition to the first fiber-reinforced plastic region, a second fiber-reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction and a plurality of fiber reinforcements oriented in the third direction, making it easier to further ensure mechanical resistance (strength, etc.) to forces acting in the first, second, and third directions that occur during vehicle travel, etc.

[0011] (4) In the rail fastening device of (3) above, the rail receiving portion may have a bottom and a pair of wall portions located on both sides of the bottom in the second direction and rising from the bottom in the third direction, the bottom having the first fiber-reinforced plastic region, and each of the pair of wall portions having the second fiber-reinforced plastic region.

[0012] When a vehicle is traveling, a wheel load acts on the bottom portion, a lateral force acts on the pair of wall portions, and a force acts in a third direction due to the influence of vehicle vibrations, etc. The lateral force on the pair of wall portions pushes the pair of walls outward, so a force acts on the bottom portion in the second direction. Furthermore, as the vehicle travels in the longitudinal direction of the rail, a force acts on the bottom portion and the pair of wall portions in the first direction. The wheel load acting on the bottom portion compresses the bottom portion. Similarly, the lateral force on the wall portions compresses the wall portions. Fiber-reinforced plastics can ensure excellent mechanical properties against compressive forces. Therefore, when the bottom portion has the first fiber-reinforced plastic region and each of the pair of wall portions has the second fiber-reinforced plastic region, the bottom portion and the pair of wall portions can withstand the compressive forces acting thereon. Furthermore, since the bottom portion has a first fiber-reinforced plastic region including a plurality of fiber reinforcing members oriented in the first direction and a plurality of fiber reinforcing members oriented in the second direction, the bottom portion can better withstand forces acting in the first and second directions. Similarly, since each of the pair of wall portions has a second fiber-reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction and a plurality of fiber reinforcements oriented in the third direction, the pair of wall portions can withstand forces acting in the first direction and the third direction. Therefore, in the rail fastening device of (3) above, when the plate body is made of fiber-reinforced plastic, it is possible to further ensure the mechanical resistance (strength, etc.) of the rail fastening device.

[0013] (5) Any of the rail fastening devices (1) to (4) above further includes a pair of fastening bolts for attaching a pair of fastening springs to the plate body, the pair of fastening springs being provided at the bottom of the rail and pressing down on a pair of flange portions protruding in the second direction, the pair of fastening bolts being inserted into and fixed to the plate body along a third direction perpendicular to the first and second directions so that a portion of the pair of fastening bolts protrudes above the plate body, and the portion of the plate body where the pair of fastening bolts are arranged may have the first fiber-reinforced plastic region.

[0014] Because the fastening bolt is inserted into the plate body along the third direction as described above, a pull-out force acts on the plate body in the third direction via the fastening bolt due to vibrations during vehicle travel, etc. If the portion where the fastening bolt is disposed has the first fiber-reinforced plastic region, the pull-out force acts as a compressive force on the first fiber-reinforced plastic region. Therefore, the portion where the fastening bolt is disposed further has mechanical resistance to the pull-out force.

[0015] (6) In any of the rail fastening devices (1) to (5) above, the pair of side portions may have bolt placement portions formed with bolt hole portions through which bolts for fixing the plate body to the support body are passed, and the bolt placement portions may have the first fiber-reinforced plastic region.

[0016] The bolt placement portion is fixed to the support body using a bolt passed through the bolt hole portion. By fixing the bolt placement portion in this manner, forces in the first and second directions acting on the rail receiving portion when the vehicle is running also act on the bolt placement portion. In the rail fastening device of (6) above, the bolt placement portion has the first fiber-reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction and a plurality of fiber reinforcements oriented in the second direction. Therefore, the bolt placement portion can withstand forces acting in the first and second directions.

[0017] (7) In the rail fastening device of (3) above, the plate body has an upper plate located on the opposite side of the bottom surface of the plate body, the rail receiving portion has a bottom and a pair of wall portions located on both sides of the bottom in the second direction and rising from the bottom in the third direction, the material of the upper plate is insulating fiber reinforced plastic, the upper plate has a bottom region included in the bottom, wall regions included in each of the pair of wall portions and rising continuously from the bottom region in the third direction, and an upper region in the wall region that is bent continuously in the second direction from the side opposite the bottom region, the bottom region and the upper region may be the first fiber reinforced plastic region, and the wall regions may be the second fiber reinforced plastic region.

[0018] When the bottom region of the upper plate is the first fiber-reinforced plastic region and the wall region is the second fiber-reinforced plastic region, the bottom and wall regions can withstand compressive forces acting thereon. Furthermore, since the bottom region is the first fiber-reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction and a plurality of fiber reinforcements oriented in the second direction, the bottom can withstand forces acting in the first and second directions. Similarly, since the wall region is the second fiber-reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction and a plurality of fiber reinforcements oriented in the third direction, the pair of wall regions can withstand forces acting in the first and third directions. For example, a portion of a fastening spring for holding a rail may contact the upper region of the upper plate. When the fastening spring elastically deforms due to rail vibration, the fastening spring expands or contracts in the second direction, and the upper region is subjected to a force in the second direction. Furthermore, because the upper region is continuously connected to the bottom and wall regions, a force in the first direction also acts on the upper region. In the rail fastening device of (7) above, the upper region is a first fiber-reinforced plastic region that includes a plurality of fiber reinforcements oriented in the first direction and a plurality of fiber reinforcements oriented in the second direction, so the upper region can also withstand forces acting in the first and second directions more effectively. Therefore, in the rail fastening device of (7) above, when the plate body is made of fiber-reinforced plastic, it is possible to further ensure the mechanical resistance (strength, etc.) of the rail fastening device.

[0019] (8) The rail fastening device of (7) above further has a pair of fastening bolts for attaching a pair of fastening springs provided at the lower part of the rail and pressing a pair of flange portions protruding in the second direction to the plate body, and the pair of fastening bolts are inserted and fixed to the plate body along the third direction so that a portion of the pair of fastening bolts protrudes above the plate body, and the pair of fastening bolts may pass through the upper region.

[0020] Because the fastening bolt is inserted into the plate body along the third direction as described above, a pull-out force acts on the plate body in the third direction via the fastening bolt due to vibrations during vehicle travel, etc. If the portion where the fastening bolt is disposed has the first fiber-reinforced plastic region, the pull-out force acts as a compressive force on the first fiber-reinforced plastic region. Therefore, the portion where the fastening bolt is disposed further has mechanical resistance to the pull-out force.

[0021] (9) In the rail fastening device of (7) or (8) above, the plate body has a pair of side plates, and the pair of side plates have a first region arranged on each of the pair of side portions and a second region included in a corresponding one of the pair of wall portions and rising continuously from the first region in a third direction, the first region being the first fiber-reinforced plastic region, and the second region being the second fiber-reinforced plastic region, and the first region may have a bolt hole portion formed therein through which a bolt for fixing the plate body to a support body is passed.

[0022] The bolt arrangement portion is fixed to the support body by using a bolt passed through the bolt hole portion. By fixing the first region in this manner, forces in the first and second directions acting on the rail receiving portion during vehicle travel also act on the first region. In the rail fastening device of (9) above, the first region is the first fiber-reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction and a plurality of fiber reinforcements oriented in the second direction, so the first region can withstand forces acting in the first and second directions. Furthermore, the second region is the second fiber-reinforced plastic region, similar to the wall region, and is included in the wall portion. In other words, the wall portion has the second fiber-reinforced plastic region as the wall region and the second fiber-reinforced plastic region as the second region. Therefore, in the rail fastening device of (9) above, the wall portion has further improved mechanical resistance (such as strength) to forces in the first and second directions. [Effects of the Invention]

[0023] According to the present invention, it is possible to provide a rail fastening device that can further ensure insulation between the rail and the support body. [Brief explanation of the drawings]

[0024] [Figure 1] FIG. 1 is a schematic diagram showing a state in which a rail is attached to a rail fastening device according to this embodiment. [Figure 2] FIG. 2 is a schematic diagram of the rail fastening device shown in FIG. 1 as viewed from the longitudinal direction of the rail. [Figure 3] FIG. 3 is a perspective view of the rail fastening device shown in FIG. [Figure 4] FIG. 4 is a plan view of a plate body included in the rail fastening device shown in FIG. [Figure 5] Figure 5(a) is a schematic diagram for explaining the first fiber-reinforced plastic region of the plate body, and Figure 5(b) is a schematic diagram for explaining the first fiber-reinforced plastic region of the plate body. [Figure 6] FIG. 6 is a schematic diagram of a cross-sectional configuration taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a schematic diagram of a cross-sectional configuration taken along line VIIa-VIIa (or line VIIb-VIIb) in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0025] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are designated by the same reference numerals, and duplicate explanations will be omitted. The dimensional proportions of the drawings do not necessarily correspond to those in the description.

[0026] FIG. 1 is a schematic diagram showing a state in which a rail 2 is attached to a rail fastening device 1 according to this embodiment. FIG. 2 is a schematic diagram of the rail fastening device 1 of FIG. 1 as viewed from the longitudinal direction of the rail 2. FIGS. 1 and 2 show one rail 2 out of two rails. In FIGS. 1 and 2, the left side of the drawings is the inner side of the gauge, and the right side of the drawings is the outer side of the gauge. As shown in FIGS. 1 and 2, the longitudinal direction of the rail 2 is referred to as the Y direction (first direction), the direction perpendicular to the Y direction when the rail fastening device 1 is viewed from the rail 2 side is referred to as the X direction (second direction), and the direction perpendicular to the X and Y directions is referred to as the Z direction (third direction).

[0027] The rail fastening device 1 according to this embodiment is a device that fastens a rail 2 to a bearing 3 and maintains the gauge. The rail fastening device 1 is, for example, a fastening device for a slab track. The rail 2 is a track member that supports and guides the wheels of a railway vehicle.

[0028] The rail 2 has a rail head portion 2a that comes into contact with the wheels, a rail lower portion 2b that is attached to the rail fastening device 1, and a rail web portion 2c that connects the rail head portion 2a and the rail lower portion 2b. In a plan view (when viewed from the Z direction), the rail lower portion 2b has a pair of flange portions 2d, 2d that protrude from both sides of the rail web portion 2c.

[0029] The rail fastening device 1 will be described further with reference to Figures 3 and 4. Figure 3 is a perspective view of the rail fastening device 1 shown in Figure 1. Figure 4 is a plan view (as viewed from the Z direction) of the plate body 10 of the rail fastening device 1 shown in Figure 1.

[0030] The rail fastening device 1 has a plate body 10. The rail fastening device 1 may have a pair of fastening bolts 20, 20. In this embodiment, a form in which the rail fastening device 1 has a pair of fastening bolts 20, 20 will be described.

[0031] The plate body 10 has a rail receiving portion 11 and a pair of side portions 12, 12. The shape of the plate body 10 in a plan view (the shape when viewed from the Z direction) is quadrangular. In this embodiment, the shape of the plate body 10 in a plan view is rectangular, and the long side direction of the plate body 10 is the X direction.

[0032] The rail receiving portion 11 is a portion where the rail lower portion 2b is disposed and has a concave shape. Specifically, the rail receiving portion 11 has a bottom portion 11a and a pair of wall portions 11b, 11b. An example of the thickness (vertical length) of the bottom portion 11a is 21.2 mm or more and 24.8 mm or less. In one embodiment, the thickness of the bottom portion 11a is slightly thicker toward the outside of the track so that the rail 2 can be attached to the rail fastening device 1 at an angle. The pair of wall portions 11b, 11b rise continuously in the Z direction from both X-direction edges of the bottom portion 11a. The length between the pair of wall portions 11b, 11b (X-direction length) is substantially equal to the X-direction length of the rail lower portion 2b. An example of the thickness of the wall portion 11b is 26.5 mm or more and 106.5 mm or less. An example of the height of the wall portion 11b (depth of the rail receiving portion 11) is 35.2 mm or more and 38.8 mm or less. The wall portion 11b is also called a shoulder portion.

[0033] The pair of side portions 12, 12 are located on both sides of the rail receiving portion 11 in the X direction. When the plate body 10 is viewed from above, the pair of side portions 12, 12 continuously protrude outward (opposite the rail receiving portion 11) from the pair of wall portions 11b, 11b. Each of the pair of side portions 12, 12 has a first side portion 12a and a second side portion (bolt placement portion) 12b.

[0034] The first side portion 12a and the second side portion 12b are adjacent to each other in the Y direction. The first side portion 12a of one of the pair of side portions 12 and the first side portion 12a of the other side portion 12 are located diagonally opposite each other. In other words, when one of a pair of edges extending in the X direction of the plate body 10 is defined as a reference edge, the first side portion 12a and the second side portion 12b of one of the pair of side portions 12 are arranged in the order of the first side portion 12a and the second side portion 12b in relation to the reference edge along the Y direction, and the first side portion 12a and the second side portion 12b of the other side portion 12 are arranged in the order of the second side portion 12b and the first side portion 12a in relation to the reference edge along the Y direction.

[0035] The first side portion 12a is a portion where the fastening spring 4 attached to the fastening bolt 20 is disposed. In this embodiment, the thickness of the first side portion 12a is greater than the thickness of the second side portion 12b. An example of the thickness of the first side portion 12a is 58.5 mm or more and 61.5 mm or less. As described above, the first side portion 12a is continuously connected to the wall portion 11b, but in FIG. 4, the boundary between the wall portion 11b and the first side portion 12a is shown by a dashed line for convenience. On the opposite side of each first side portion 12a from the rail receiving portion 11, a raised portion (or thick portion) 12c that rises vertically upward is formed.

[0036] The second side portion 12b is a portion where an anchor bolt 5 is disposed to fix the plate body 10 to the support body 3. The thickness of the second side portion 12b is, for example, 26.2 mm or more and 29.2 mm or less. The second side portion 12b is formed with a bolt hole portion 13 through which the anchor bolt 5 is passed.

[0037] As shown in Figures 2 and 3, a pair of fastening bolts 20, 20 penetrate the plate body 10 in the Z direction. The pair of fastening bolts 20, 20 are provided on the first side portion 12a side in the Y direction. In this embodiment, the fastening bolt 20 is disposed at the boundary between the wall portion 11b and the first side portion 12a. A portion of the fastening bolt 20 protrudes upward from the plate body 10. In other words, the length of the fastening bolt 20 in the Z direction is longer than the length of the plate body 10 in the Z direction.

[0038] The fastening bolt 20 of this embodiment will be described in detail based on the configuration shown in FIG. 2. The fastening bolt 20 of this embodiment has a bolt body 21 and an end plate 22. The bolt body 21 is cylindrical and has a threaded portion formed on its outer periphery. The end plate 22 is connected to one end of the bolt body 21 and functions as the head of the fastening bolt 20. The end plate 22 is fixed to the bolt body 21 concentrically with the bolt body 21. The end plate 22 is, for example, a steel plate. In this embodiment, the shape of the end plate 22 is circular when viewed from the Z direction. When viewed from the Z direction, the size of the end plate 22 is larger than the bolt body 21. In other words, the diameter of the end plate 22 is larger than the diameter of the bolt body 21. The shape of the end plate 22 when viewed from the Z direction is not limited to a circle, and may be, for example, a polygon (e.g., hexagonal).

[0039] 2, the fastening bolt 20 is provided on the plate body 10 so that the bolt body 21 on the side opposite the end plate 22 protrudes upward from the plate body 10. A through hole 14 through which the fastening bolt 20 passes is formed in the plate body 10.

[0040] 1 and 2, the rail fastening device 1 is fixed to the support body 3 by a pair of anchor bolts 5, 5. The anchor bolts 5 are threadedly engaged with bolt receiving portions (not shown) of the support body 3 through corresponding bolt hole portions 13. At least one washer 6a may be provided between the anchor bolt 5 and the bolt hole portion 13.

[0041] The rail 2 is attached to the rail fastening device 1 with the rail lower portion 2b positioned within the rail receiving portion 11 and the pair of flange portions 2d, 2d of the rail lower portion 2b pressed by a pair of fastening springs 4, 4. An adjustment shim 8 and a track pad 9 may be disposed between the rail lower portion 2b and the bottom portion 11a from the bottom portion 11a side. When viewed from the Z direction, the rail lower portion 2b and the fastening spring 4 are sized so that one end in the X direction contacts the flange portion 2d of the rail lower portion 2b and the other end contacts the raised portion 12c of the first side portion 12a. FIG. 2 illustrates a plate-shaped fastening spring 4 curved in the Z direction. The fastening spring 4 is made of, for example, fiber-reinforced plastic. Examples of the material of the fiber-reinforced plastic are the same as the material of the plate body 10 described below. The fastening spring 4 is secured by a nut 7 while being threaded through a fastening bolt 20. At least one washer 6b may be disposed between the nut 7 and the fastening spring 4.

[0042] The plate body 10 according to one embodiment will now be further described.

[0043] The plate body 10 is made of insulating fiber reinforced plastic. That is, the material of the plate body 10 is insulating fiber reinforced plastic. The volume resistivity of the fiber reinforced plastic is, for example, 10 8 Ω·m(10 10 The upper limit of the volume resistivity of the fiber reinforced plastic is not limited, but is, for example, 10 16 Ω·m(10 18 Ω·cm).

[0044] The fiber reinforcement (or reinforcing fiber or reinforcing material) contained in the fiber reinforced plastic is a non-conductive fiber such as glass fiber or aramid fiber. The fiber reinforcement may be a continuous fiber that exists continuously in the fiber reinforced plastic (composite material) using the fiber reinforcement, or may be a short fiber that exists discontinuously. Continuous fiber is a fiber having a portion that extends continuously between one end and the other end of a member (such as an upper plate described later) formed from the fiber reinforced plastic. When the fiber reinforcement is a continuous fiber, for example, a plurality of fiber reinforcements may be woven into a woven fabric. The weaving method may be plain weave, satin weave, or the like. For convenience of explanation, short fibers having a fiber length of about 1 mm to 3 mm may be referred to as "first short fibers," and short fibers having a fiber length of about 10 mm to 80 mm may be referred to as "second short fibers." The fiber length of the second short fibers may be about 10 mm to 50 mm.

[0045] The matrix resin of fiber-reinforced plastics is not particularly limited, but examples include thermosetting resins such as epoxy resin, unsaturated polyester resin, and vinyl ester resin, and thermoplastic resins such as polyethylene, polypropylene, nylon, ABS (acrylonitrile butadiene styrene), PEEK (polyether ether ketone), and polyimide.

[0046] The manufacturing method of fiber reinforced plastics is not limited, and various methods can be used, such as hand layup molding, spray-up method, BMC (bulk molding compound), SMC (sheet molding compound), transfer molding, and RTM (resin transfer molding).

[0047] The type, density, etc. of the fiber reinforcement material in the fiber reinforced plastic are designed so that the plate body 10 satisfies the mechanical properties and insulating properties required for the rail fastening device 1. For example, fiber reinforced plastic that satisfies the following specifications can be used. Matrix resin: Unsaturated polyester Fiber: Glass fiber Fiber composition: woven fabric (plain weave) Fiber weight: 200g / m 2 Fiber content: 30-35% Manufacturing method: Hand layup Molding temperature: normal temperature

[0048] In one embodiment, the plate body 10 has at least one first fiber-reinforced plastic region 100 A. The plate body 10 may have at least one second fiber-reinforced plastic region 100 B. Unless otherwise specified, the plate body 10 will be described as having at least one second fiber-reinforced plastic region 100 B.

[0049] FIG. 5(a) is a schematic diagram illustrating the first fiber-reinforced plastic region 100A. FIG. 5(b) is a schematic diagram illustrating the second fiber-reinforced plastic region 100B. As shown in FIG. 5(a), the first fiber-reinforced plastic region 100A includes a plurality of fiber reinforcements 100a oriented in the X direction, a plurality of fiber reinforcements 100b oriented in the Y direction, and a matrix resin 100c. In FIG. 5(a), the fiber reinforcements 100a and 100b are continuous fibers and are included in the first fiber-reinforced plastic region 100A as a woven fabric. Although the fiber reinforcements 100a and 100b are at least partially embedded in the matrix resin 100c, they are shown in solid lines in FIG. 5(a) to clearly show them.

[0050] As shown in FIG. 5(b), the second fiber-reinforced plastic region 100B includes a plurality of fiber reinforcements 100b oriented in the Y direction, a fiber reinforcement 100d oriented in the Z direction, and a matrix resin 100c. In FIG. 5(b), the fiber reinforcements 100b and 100d are continuous fibers and are included in the first fiber-reinforced plastic region 100A as a woven fabric. The fiber reinforcements 100b and 100d are at least partially embedded in the matrix resin 100c, but as in FIG. 5(a), the fiber reinforcements 100b and 100d are indicated by solid lines in FIG. 5(b).

[0051] 5(a) and 5(b), for ease of explanation, the fiber reinforcements in the first fiber-reinforced plastic region 100A and the second fiber-reinforced plastic region 100B are shown as fiber reinforcements 100a, 100b, and 100d. The fiber reinforcements 100a, 100b, and 100d may be the same or different fiber reinforcements. Similarly, the matrix resin 100c in the first fiber-reinforced plastic region 100A and the matrix resin 100c in the second fiber-reinforced plastic region 100B may be the same or different.

[0052] In one embodiment, the bottom 11a of the rail receiving portion 11 has a first fiber-reinforced plastic region 100A, and one wall 11b has a second fiber-reinforced plastic region 100B. The first fiber-reinforced plastic region 100A may be the portion of the first side portion 12a where the fastening spring 4 is arranged. The second side portion 12b where the anchor bolt 5 is arranged may have the first fiber-reinforced plastic region 100A.

[0053] An example of the plate body 10 will be described in more detail with reference to Figures 6 and 7. Figure 6 is a schematic diagram of a cross-sectional configuration taken along line VI-VI in Figure 4. Figure 7 is a schematic diagram of a cross-sectional configuration taken along line VIIa-VIIa in Figure 4. In the embodiment of Figure 4, the cross-sectional configuration taken along line VIIb-VIIb in Figure 4 is the same as that of Figure 7, so Figure 7 also corresponds to the schematic diagram of the cross-sectional configuration taken along line VIIb-VIIb in Figure 4.

[0054] The plate body 10 according to one embodiment includes an underplate 101, an upper plate 102, a pair of side plates 103, 103, and a pair of side blocks 104, 104. The underplate 101, the upper plate 102, the pair of side plates 103, 103, and the pair of side blocks 104, 104 are made of the above-mentioned insulating fiber-reinforced plastic.

[0055] Unless otherwise specified, the fiber reinforcement material will be described below as continuous fibers, and the fiber reinforced plastic will be described as including a woven fabric made of a plurality of continuous fibers.

[0056] The underplate 101 forms the bottom surface of the plate body 10. In a plan view, the underplate 101 has the same shape as the plate body 10. The underplate 101 of this embodiment has a mountain-shaped protrusion that protrudes vertically upward below the pair of wall portions 11b. In this case, the bottom surface of the plate body 10 is recessed vertically upward in a portion corresponding to the pair of wall portions 11b. The protrusion (in other words, the recessed portion on the bottom surface of the plate body 10) extends in the Y direction. An example thickness of the underplate 101 is 9.8 mm or more and 12.7 mm or less. In this embodiment, the thickness of the underplate 101 on the outer side of the track is thicker in a portion corresponding to the bottom portion 11a of the underplate 101.

[0057] The underplate 101 has one or more layers formed of the above-mentioned fiber-reinforced plastic. The multiple fiber reinforcing materials constituting the underplate 101 are the same (for example, glass fiber). In this embodiment, the underplate 101 is a first fiber-reinforced plastic region 100A.

[0058] The upper plate 102 is disposed on the opposite side of the bottom surface of the plate body 10. The upper plate 102 forms the outer surfaces of the rail receiving portion 11 and the pair of first side portions 12a. In other words, the upper plate 102 is appropriately curved so as to form the outer surfaces of the rail receiving portion 11 and the pair of first side portions 12a. An example thickness of the upper plate 102 is 8.5 mm or more and 11.5 mm or less.

[0059] The upper plate 102 has a bottom region 102a corresponding to the bottom 11a, wall regions 102b corresponding to each of the pair of wall portions 11b and rising continuously vertically upward from the bottom region 102a, and an upper region 102c that is continuously curved in the X direction from the end of the wall region 102b opposite the bottom region 102a (a corner of the wall portion 11b) toward the opposite side from the rail receiving portion 11. The vicinity of the end of the upper region 102c opposite the rail receiving portion 11 is curved so as to form the outer surface of the raised portion 12c.

[0060] The upper plate 102 has one or more layers formed of the above-mentioned fiber-reinforced plastic. The multiple fiber reinforcements constituting the upper plate 102 are the same (for example, glass fiber). In the upper plate 102, the bottom region 102a and the top region 102c are the first fiber-reinforced plastic region 100A, and the wall region 102b is the second fiber-reinforced plastic region 100B. Because the bottom region 102a, the wall region 102b, and the top region 102c are continuous, the fiber reinforcement 100a and the fiber reinforcement 100d shown in FIGS. 5(a) and 5(b) are continuous fiber reinforcements (in other words, a single, connected fiber reinforcement). In other words, when viewed from the perspective of the fiber reinforcement 100a, the fiber reinforcement 100a is bent according to the shape of the upper plate 102. Therefore, in the wall region 102b, the fiber reinforcement 100a bends in the Z direction and functions as fiber reinforcement 100d oriented in the Z direction, and in the upper region 102c, it again functions as fiber reinforcement 100a oriented in the X direction.

[0061] The pair of side plates 103 are disposed between the under plate 101 and the upper plate 102. The pair of side plates 103 are disposed on both sides of a recess formed by the bottom region 102a and the pair of wall regions 102b of the upper plate 102. The length of the pair of side plates 103 in the Y direction is the same as the length of the plate body 10 in the Y direction. The pair of side plates 103 are substantially L-shaped when viewed from the Y direction.

[0062] The side plate 103 has a first region 103a corresponding to the side portion 12, and a second region 103b rising vertically upward from the end of the first region 103a on the rail receiving portion 11 side. The first region 103a is in contact with the underplate 101. The portion of the first region 103a corresponding to the second side portion 12b forms the outer surface of the second side portion 12b. As shown in FIG. 6, the inner surface of the second region 103b (the surface on the rail receiving portion 11 side) is in contact with the wall region 102b. The upper end surface of the second region 103b (the end surface opposite the underplate 101) is in contact with the upper region 102c. The second region 103b forms part of the wall portion 11b.

[0063] The side plate 103 has one or more layers formed from the above-mentioned fiber-reinforced plastic. The multiple fiber reinforcements constituting the side plate 103 are the same (for example, glass fiber). In the side plate 103, the first region 103a is the first fiber-reinforced plastic region 100A, and the second region 103b is the second fiber-reinforced plastic region 100B. Because the first region 103a and the second region 103b are continuous, the fiber reinforcement 100a and the fiber reinforcement 100d shown in FIGS. 5(a) and 5(b) are a continuous fiber reinforcement (in other words, a single, connected fiber reinforcement). In other words, when the fiber reinforcement 100a is used as a reference, the fiber reinforcement 100a is bent according to the shape of the side plate 103, and in the second region 103b, it functions as the fiber reinforcement 100d oriented in the Z direction.

[0064] The pair of side blocks 104 are block-shaped members that fill the space between the upper plate 102 and the side plate 103 (specifically, the first region 103a) in the pair of first side portions 12a. The fiber reinforcement contained in the fiber reinforced plastic that constitutes each of the pair of side blocks 104 is first short fibers with a fiber length of about 1 to 3 mm. The fiber reinforced plastic that constitutes each of the pair of side blocks 104 is formed, for example, by embedding a plurality of first short fibers (e.g., short glass fibers) in a matrix resin. The fiber reinforcement contained in the pair of side blocks 104 may be second short fibers.

[0065] As described above, the plate body 10 has a through hole 14 formed therein. As shown in Figures 6 and 7, the through hole 14 according to this embodiment has a first portion 14a in which the bolt body 21 is disposed, a second portion 14b in which the end plate 22 is disposed, and a third portion 14c that widens from the second portion 14b toward the bottom surface. Portions (holes or notches) of the through hole 14 are formed in each of the under plate 101, the upper plate 102, the pair of side plates 103, 103, and the pair of side blocks 104, 104.

[0066] As described above, the bolt hole portions 13 are formed in the second side portion 12b of the plate body 10. Specifically, as shown in Fig. 7, holes corresponding to the bolt hole portions 13 are formed in the first region 103a of the side plate 103 and in the portion of the under plate 101 corresponding to the second side portion 12b.

[0067] The underplate 101, the upper plate 102, the pair of side plates 103, 103, and the pair of side blocks 104, 104 are made of insulating fiber-reinforced plastic. The type, density, etc. of the fiber reinforcement material in the underplate 101, the upper plate 102, the pair of side plates 103, 103, and the pair of side blocks 104, 104 are designed so that the plate body 10 satisfies the mechanical properties required for the rail fastening device 1. The matrix resins contained in the underplate 101, the upper plate 102, the pair of side plates 103, 103, and the pair of side blocks 104, 104 can be, for example, the same matrix resin.

[0068] The rail fastening device 1 according to this embodiment is manufactured, for example, as follows. The underplate 101, upper plate 102, pair of side plates 103, pair of side blocks 104, and pair of fastening bolts of the plate main body 10 described above are prepared. At this time, the underplate 101, upper plate 102, pair of side plates 103, and pair of side blocks 104 are formed with the through hole 14 and a portion of the bolt hole portion 13 so that the through hole 14 and the bolt hole portion 13 are formed when the plate main body 10 is assembled by combining them. Thereafter, the underplate 101, upper plate 102, pair of side plates 103, and pair of side blocks 104 are arranged in the above-described positions (i.e., arranged to form the plate main body 10), and with the pair of fastening bolts 20 inserted into the through holes 14, they are heat-welded. This results in the rail fastening device 1. Because the pair of fastening bolts 20 are heat-welded with the pair of fastening bolts 20 in place, the pair of fastening bolts 20 are also integrally fixed to the plate main body 10. At this time, any gaps in the threaded portion of the bolt body 21 are filled with resin.

[0069] The material of the plate body 10 of the rail fastening device 1 is insulating fiber reinforced plastic. In this case, the insulating plate body 10 is interposed between the rail 2 and the bearing body 3. Therefore, the insulation distance between the rail 2 and the bearing body 3 can be longer than when the rail 2 and the bearing body 3 are insulated by placing an insulating plate between the metal plate body and the bearing body 3. As a result, the rail fastening device 1 can ensure insulation more reliably.

[0070] As described above, the rail fastening device 1 can ensure a longer insulation distance between the rail 2 and the bearing body 3. Therefore, even if dust adheres to the surface of the plate body 10, the deterioration of the insulation performance is suppressed, thereby reducing transportation problems.

[0071] Since the material of the plate body 10 is fiber reinforced plastic having insulating properties, it is possible to prevent corrosion, electrolytic corrosion, etc. of metallic components such as the rail fastening device 1 and the rail 2 in a wet state.

[0072] When the vehicle is traveling, forces act on the plate body 10 in the X, Y and Z directions due to wheel load, lateral pressure, curvature of the rail, slight deflection of the rail, etc. Because the material of the plate body 10 is fiber reinforced plastic, the rail fastening device 1 can ensure mechanical resistance (strength, etc.) to forces in the X, Y and Z directions.

[0073] Fiber reinforced plastics have superior mechanical properties in the direction of fiber reinforcement orientation.

[0074] As shown in Fig. 5(a), the first fiber-reinforced plastic region 100A includes a plurality of fiber reinforcements 100a oriented in the X direction, a plurality of fiber reinforcements 100b oriented in the Y direction, and a matrix resin 100c. Therefore, the first fiber-reinforced plastic region 100A has superior mechanical properties in both the X and Y directions. As a result, when the plate body 10 has the first fiber-reinforced plastic region 100A, the rail fastening device 1 can easily ensure the mechanical properties required for a rail fastening device.

[0075] As shown in Fig. 5(b), the second fiber-reinforced plastic region 100B includes a plurality of fiber reinforcements 100b oriented in the Y direction, a plurality of fiber reinforcements 100d oriented in the Z direction, and a matrix resin 100c. Therefore, the second fiber-reinforced plastic region 100B has superior mechanical properties in the Y direction and the Z direction. Therefore, when the plate body 10 has the second fiber-reinforced plastic region 100B, the rail fastening device 1 can easily ensure the mechanical properties required as a rail fastening device.

[0076] As described above, the first fiber-reinforced plastic region 100A can ensure excellent mechanical properties in the X and Y directions, and the second fiber-reinforced plastic region 100B can ensure excellent mechanical properties in the Y and Z directions. Therefore, in a configuration in which the plate body 10 has the above-mentioned first fiber-reinforced plastic region 100A and second fiber-reinforced plastic region 100B, the rail fastening device 1 can more easily ensure the mechanical properties required as a rail fastening device.

[0077] When the vehicle is traveling, a wheel load acts on the bottom 11a of the rail support portion 11, and lateral pressure acts on the pair of wall portions 11b, 11b, and a force acts in the Z direction due to the influence of vehicle vibrations, etc. The lateral pressure on the pair of wall portions 11b, 11b pushes the pair of wall portions 11b, 11b outward, so that a force in the X direction also acts on the bottom 11a. As the vehicle travels in the longitudinal direction of the rail 2, a force also acts in the Y direction on the bottom 11a and the pair of wall portions 11b, 11b.

[0078] A wheel load acting on the bottom portion 11a compresses the bottom portion 11a. Similarly, a lateral pressure on the wall portion 11b compresses the wall portion 11b. Fiber-reinforced plastics are resistant to compressive forces. Therefore, when the bottom portion 11a has the first fiber-reinforced plastic region 100A and the pair of wall portions 11b, 11b each have the second fiber-reinforced plastic region 100B, the bottom portion 11a and the pair of wall portions 11b, 11b can sufficiently withstand the compressive forces acting thereon. Furthermore, because the bottom portion 11a has the first fiber-reinforced plastic region 100A, the bottom portion 11a has higher resistance to forces acting in the X direction and the Y direction. Similarly, because the pair of wall portions 11b, 11b each have the second fiber-reinforced plastic region 100B, the pair of wall portions 11b, 11b also have higher resistance to forces acting in the Y direction and the Z direction. Therefore, in a configuration in which the bottom 11a has the first fiber-reinforced plastic region 100A and the pair of wall portions 11b, 11b have the second fiber-reinforced plastic region 100B, the rail fastening device 1 can further ensure mechanical resistance as a rail fastening device.

[0079] In the configuration shown in FIGS. 6 and 7, the bottom region 102a of the upper plate 102 is the first fiber-reinforced plastic region 100A, and the wall region 102b is the second fiber-reinforced plastic region 100B. Therefore, the bottom 11a has the first fiber-reinforced plastic region 100A, and the wall 11b has the second fiber-reinforced plastic region 100B. Therefore, even in the configuration shown in FIGS. 6 and 7, the rail fastening device 1 can further ensure the mechanical strength as a rail fastening device. In the configuration shown in FIGS. 6 and 7, the underplate 101 also corresponds to the first fiber-reinforced plastic region 100A. Therefore, the bottom 11a has the first fiber-reinforced plastic region 100A as the bottom region 102a, as well as the first fiber-reinforced plastic region 100A as a region corresponding to the bottom 11a of the underplate 101. Therefore, the mechanical properties of the bottom 11a are improved.

[0080] 6 and 7, the second region 103b of the side plate 103 forms a part of the wall portion 11b, and the second region 103b is the second fiber-reinforced plastic region 100B. Therefore, the wall portion 11b has the second fiber-reinforced plastic region 100B as the second region 103b of the side plate 103, as well as the second fiber-reinforced plastic region 100B as the wall portion region 102b. This improves the mechanical properties of the wall portion 11b.

[0081] In a configuration in which the rail fastening device 1 has a pair of fastening bolts 20 as shown in FIGS. 1 to 3 , the fastening bolts 20 are inserted into the plate body 10 along the Z direction. In this case, a pull-out force acts on the plate body 10 in the Z direction via the fastening bolt 20 due to vibrations during vehicle travel, etc. If the portion where the fastening bolt 20 is arranged has the first fiber-reinforced plastic region 100A, the pull-out force acts as a compressive force on the first fiber-reinforced plastic region 100A. Therefore, the portion where the fastening bolt 20 is arranged also has mechanical resistance to the pull-out force.

[0082] 6 and 7, the fastening bolt 20 penetrates, for example, the upper region 102c. The upper region 102c is the first fiber-reinforced plastic region 100A. Therefore, the configuration shown in FIGS. 6 and 7 corresponds to a configuration in which the first fiber-reinforced plastic region 100A is disposed in the portion where the fastening bolt 20 is disposed.

[0083] In the configuration shown in FIGS. 6 and 7, the fastening bolt 20 penetrates a portion of the second region 103b of the side plate 103. The pull-out force generated by the fastening bolt 20 acts in the Z direction on the second region 103b. Because the second region 103b is the second fiber-reinforced plastic region 100B, it has sufficient resistance to the force acting in the Z direction. Therefore, the rail fastening device 1 having the plate body 10 in the configuration shown in FIGS. 6 and 7 is configured to be more effective against the pull-out force.

[0084] When fastening the rail 2 to the support body 3, a fastening spring 4 is attached to the fastening bolt 20. One end of the fastening spring 4 contacts the upper part of the first side portion 12a (particularly the raised portion 12c). When the fastening spring 4 elastically deforms due to vibration of the rail 2, the fastening spring 4 expands and contracts in the X direction, and the first side portion 12a receives a force in the X direction. In the configuration shown in FIGS. 6 and 7, the upper part of the first side portion 12a is formed by the upper region 102c. Because the first side portion 12a is continuously connected to the rail support portion 11, it also receives a force in the Y direction when the vehicle is traveling. Because the upper region 102c is the first fiber-reinforced plastic region 100A, the upper region 102c also has higher resistance to forces acting in the X and Y directions. Therefore, the rail fastening device 1 having the plate body 10 of the configuration shown in FIGS. 6 and 7 can further ensure excellent mechanical properties.

[0085] In a configuration in which each of the pair of side portions 12, 12 has a second side portion 12b, the plate body 10 is fixed to the support body 3 via an anchor bolt 5 passed through a bolt hole 13 formed in the second side portion 12b. As shown in FIG. 1 , the two second side portions 12b of the plate body 10 are arranged diagonally. Because the second side portions 12b are fixed to the support body 3 by the anchor bolts 5, forces in the X and Y directions acting on the rail receiving portion 11 during vehicle travel also act on the second side portions 12b. When the second side portions 12b have the first fiber-reinforced plastic region 100A, the second side portions 12b have better resistance to forces acting in the X and Y directions. Therefore, a configuration in which the second side portions 12b include the first fiber-reinforced plastic region 100A contributes to improving the mechanical properties of the rail fastening device 1.

[0086] In the configuration shown in FIGS. 6 and 7, a portion of the first region 103a of the side plate 103 is included in the second side portion 12b. The first region 103a is the first fiber-reinforced plastic region 100A. Therefore, the configuration shown in FIGS. 6 and 7 corresponds to a configuration in which the first fiber-reinforced plastic region 100A is disposed in the second side portion 12b. In the configuration shown in FIGS. 6 and 7, a portion of the underplate 101 corresponding to the first fiber-reinforced plastic region 100A is included in the second side portion 12b. Therefore, in the configuration shown in FIGS. 6 and 7, the second side portion 12b has the first fiber-reinforced plastic region 100A as the first region 103a and the first fiber-reinforced plastic region 100A as the underplate 101. Therefore, the configuration shown in FIGS. 6 and 7 is more effective in improving mechanical properties.

[0087] The present invention is not limited to the above-described embodiments and experimental examples, but is intended to include the scope indicated by the claims, and to include all modifications within the meaning and scope equivalent to the claims.

[0088] Although the first fiber-reinforced plastic region and the second fiber-reinforced plastic region have been described as having continuous fibers as fiber reinforcement, the fiber reinforcement of the first fiber-reinforced plastic region and the second fiber-reinforced plastic region may be short fibers (first short fibers or second short fibers). In this case, the first fiber-reinforced plastic region has a plurality of short fibers oriented in the X direction and a plurality of short fibers oriented in the Y direction. Similarly, the second fiber-reinforced plastic region has a plurality of short fibers oriented in the Y direction and a plurality of short fibers oriented in the Z direction. The fact that short fibers may be used instead of continuous fibers also applies to the underplate, upper plate, and pair of side plates described with reference to Figures 6 and 7. Even when short fibers are used as described above, the mechanical properties required for the rail fastening device can be ensured by appropriately adjusting various conditions such as the fiber length and density of the short fibers.

[0089] For example, the underplate, upper plate, and pair of side plates may be made of fiber reinforced plastic containing fiber reinforcing material with a fiber length of 10 mm or more. In one embodiment, the upper plate and pair of side plates may be made of fiber reinforced plastic containing continuous fibers, and the underplate may be made of fiber reinforced plastic containing second short fibers (for example, fibers with a fiber length of about 10 mm to 50 mm). The fiber reinforced plastic containing the second short fibers is manufactured by SMC molding. In this case, the underplate is easy to mass-produce, and as a result, a configuration in which the underplate is made of fiber reinforced plastic containing the second short fibers contributes to the mass production of rail fastening devices. Therefore, a configuration of a rail fastening device including an underplate made of fiber reinforced plastic containing the second short fibers contributes to mass production while ensuring mechanical properties.

[0090] As long as the insulating properties of the plate body can be ensured, the fiber reinforcement material may be carbon fiber. [Explanation of symbols]

[0091] 1...rail fastening device, 2...rail, 3...support body, 4...fastening spring, 5...anchor bolt (bolt), 10...plate body, 11...rail receiving portion, 11a...bottom portion, 11b...wall portion, 12...side portion, 12b...second side portion (bolt arrangement portion), 13...bolt hole portion, 100A...first fiber reinforced plastic region, 100B...second fiber reinforced plastic region, 100a...fiber reinforcement material, 100b...fiber reinforcement material, 100c...matrix resin, 100d...fiber reinforcement material, 102...upper plate, 102a...bottom region, 102b...wall region, 102c...upper region, 103...side plate, 103a...first region, 103b...second region.

Claims

1. a plate body having a rail receiving portion on which a rail is placed and a pair of side portions located on both sides of the rail receiving portion in a second direction perpendicular to a first direction that is the longitudinal direction of the rail; The material of the plate body is an insulating fiber-reinforced plastic, the plate body has a first fiber-reinforced plastic region; a material of the first fiber-reinforced plastic region is a fiber-reinforced plastic having insulating properties; The first fiber reinforced plastic region has a first fiber reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in the second direction, and a matrix resin, The plate body further includes a second fiber-reinforced plastic region; the material of the second fiber-reinforced plastic region is an insulating fiber-reinforced plastic; The second fiber reinforced plastic region includes a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in a third direction perpendicular to the first direction and the second direction, and a matrix resin; and The rail receiving portion is The bottom and a pair of wall portions located on both sides of the bottom portion in the second direction and rising from the bottom portion in the third direction; and the bottom portion has the first fiber-reinforced plastic region; Each of the pair of wall portions has the second fiber-reinforced plastic region. Rail fastening device.

2. A plate body having a rail receiving portion on which a rail is arranged and a pair of side portions located on both sides of the rail receiving portion in a second direction perpendicular to a first direction which is the longitudinal direction of the rail, The material of the plate body is an insulating fiber-reinforced plastic, the plate body has a first fiber-reinforced plastic region; a material of the first fiber-reinforced plastic region is a fiber-reinforced plastic having insulating properties; The first fiber reinforced plastic region has a first fiber reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in the second direction, and a matrix resin, The plate body further includes a second fiber-reinforced plastic region; the material of the second fiber-reinforced plastic region is an insulating fiber-reinforced plastic; The second fiber reinforced plastic region includes a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in a third direction perpendicular to the first direction and the second direction, and a matrix resin; and a pair of fastening bolts for attaching a pair of fastening springs to the plate body, the pair of fastening springs being provided at the lower part of the rail and pressing the pair of flange portions projecting in the second direction; the pair of fastening bolts are inserted into and fixed to the plate body along the third direction so that portions of the pair of fastening bolts protrude above the plate body, In the plate body, a portion where the pair of fastening bolts are arranged has the first fiber reinforced plastic region. Rail fastening device.

3. The volume resistivity of the fiber reinforced plastic is 10 ８ Ω·m or more, The rail fastening device according to claim 1 or 2.

4. The pair of side portions each have a bolt arrangement portion formed with a bolt hole portion through which a bolt for fixing the plate body to a support body is passed, The bolt arrangement portion has the first fiber reinforced plastic region. The rail fastening device according to claim 1 or 2.

5. A plate body having a rail receiving portion on which a rail is arranged and a pair of side portions located on both sides of the rail receiving portion in a second direction perpendicular to a first direction which is the longitudinal direction of the rail, The material of the plate body is an insulating fiber-reinforced plastic, the plate body has a first fiber-reinforced plastic region; a material of the first fiber-reinforced plastic region is a fiber-reinforced plastic having insulating properties; The first fiber reinforced plastic region has a first fiber reinforced plastic region including a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in the second direction, and a matrix resin, The plate body further includes a second fiber-reinforced plastic region; the material of the second fiber-reinforced plastic region is an insulating fiber-reinforced plastic; The second fiber reinforced plastic region includes a plurality of fiber reinforcements oriented in the first direction, a plurality of fiber reinforcements oriented in a third direction perpendicular to the first direction and the second direction, and a matrix resin; and the plate body has an upper plate located on the opposite side of the bottom surface of the plate body, The rail receiving portion is The bottom and a pair of wall portions located on both sides of the bottom portion in the second direction and rising from the bottom portion in the third direction; and the upper plate is made of insulating fiber-reinforced plastic; The upper plate is a bottom region included in the bottom; a wall region included in each of the pair of wall portions and rising continuously from the bottom region in the third direction; an upper region of the wall region that is continuously curved in the second direction from the opposite side of the bottom region; and the bottom region and the top region are the first fiber reinforced plastic region; The wall region is the second fiber reinforced plastic region. Rail fastening device.

6. a pair of fastening bolts for attaching a pair of fastening springs to the plate body, the pair of fastening springs being provided at the lower part of the rail and pressing the pair of flange portions projecting in the second direction; the pair of fastening bolts are inserted into and fixed to the plate body along the third direction so that portions of the pair of fastening bolts protrude above the plate body, The pair of fastening bolts pass through the upper region. The rail fastening device according to claim 5.

7. The plate body has a pair of side plates, The pair of side plates are a first region disposed on each of the pair of side portions; a second region that is included in a corresponding one of the pair of wall portions and that rises continuously from the first region in a third direction; and The first region is the first fiber reinforced plastic region, The second region is the second fiber reinforced plastic region, The first region is formed with a bolt hole portion through which a bolt for fixing the plate body to a support body is passed. The rail fastening device according to claim 5 or 6.

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