JP2000328501A - Rail fastening device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rail fastening device capable of improving durability by fundamentally eliminating the electric corrosion of fixing bolts. SOLUTION: This rail fastening device 10 is provided with a sleeper 13 having a mounted rail 11, a rail presser member 14 where an abutting part 24 for abutting on a bottom part 11a of the rail is formed, fixing bolts 15 for fastening the rail to the sleeper by fixing the rail presser member on the sleeper. The fixing bolts are composed of bolts made of fiber reinforced synthetic resin wherein the strength of screw threads is enhanced by improving the peel strength between layers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a rail fastening device for fastening a rail to a sleeper by fixing a rail holding member to a sleeper with a fixing bolt. The present invention relates to a rail fastening device in which durability is improved by forming a bolt from a fiber-reinforced synthetic resin bolt.

[0002]

2. Description of the Related Art A general rail fastening device used to fasten a railroad rail is a rail having a sleeper on which the rail is placed via a rubber pad and a contact portion which is in contact with the upper surface of the rail bottom. It has a holding member and a fixing bolt for fastening the rail to the sleeper by fixing the rail holding member to the sleeper.

Here, metal bolts are used as conventional fixing bolts, and the metal fixing bolts are plated or coated with a resin for corrosion protection.

[0004]

However, in a rail fastening device for railroad rails laid underground or in a tunnel, the metal fixing bolts are likely to corrode due to a large amount of water or moisture.

[0005] In particular, when a direct current is applied to the rails, electrolytic corrosion occurs in the metal fixing bolts, and it becomes impossible to secure a predetermined tightening force due to corrosion of the screw portion. As a result,
Fixing bolts must be replaced frequently,
There is a problem that the durability of the rail fastening device is reduced.

Further, in a subway, the distance between adjacent stations is short, and the track has a large curve and a large curvature, so that the braking operation is frequently performed and a relatively large amount of metal powder such as brake shoes is generated. are doing. For this reason, the electrical insulation is impaired, the electrolytic corrosion of the metal fixing bolt is more likely to progress, and the reduction in the durability of the rail fastening device is a significant problem.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems associated with the prior art, and provides a rail fastening device capable of fundamentally eliminating electrolytic corrosion of a fixing bolt and improving durability. With the goal.

[0008]

According to a first aspect of the present invention, there is provided a rail holder on which a rail is mounted, and a rail retainer having a contact portion which is in contact with a bottom of the rail. In a rail fastening device having a member and a fixing bolt for fastening the rail to the sleeper by fixing the rail holding member to the sleeper, the fixing bolt has a fiber with increased thread strength. A rail fastening device comprising a reinforced synthetic resin bolt.

[0009] The invention according to claim 2 is characterized in that the fiber reinforced synthetic resin bolt constituting the fixing bolt has the filament inserted into the screw thread without being cut at the valley of the male screw part. A rail fastening device characterized in that the thread strength of a male screw portion is increased.

According to a third aspect of the present invention, in the fiber reinforced synthetic resin bolt constituting the fixing bolt, a sheet-shaped molding material in which the reinforcing fiber impregnated with a thermosetting resin has a reverse angle in the opposite direction. A rail fastening device formed by cutting a sheet-like molded product that is formed by pressing a plurality of sheets and press-molding the same, and increasing the thread strength by increasing the delamination strength.

The invention according to claim 4 is characterized in that the rail holding member is made of synthetic resin or fiber-reinforced synthetic resin.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a sectional view showing a rail fastening device according to Embodiment 1 of the present invention, and FIG. 2 is a plan view showing a rail holding member and the like used in the rail fastening device. . In FIG. 1, the fixing bolt 15 on the right side of the rail 11 shows a state before tightening, and the fixing bolt 15 on the left side shows a state after tightening.

A rail fastening device 10 shown in FIGS. 1 and 2
Is a sleeper 13 on which the rail 11 is placed via a rubber pad 12, and a contact portion 2 which contacts the bottom 11a of the rail 11.
A rail holding member 14 formed with 4; a fixing bolt 15 for fastening the rail 11 to the sleeper 13 by fixing the rail holding member 14 to the sleeper 13;
have.

The rail 11 has a bottom 11a and the bottom 1
An abdomen 11b rising from the center of 1a and a head 11c provided at the top of the abdomen 11b are provided.

The sleeper 13 is a concrete sleeper (PC sleeper) in the illustrated example. On the upper surface thereof, a rail mounting portion 16 on which the rail 11 is mounted is located on both sides of the rail mounting portion 16. A recess 17 having a predetermined depth is formed. An embedding plug 18 into which the fixing bolt 15 is screwed is embedded in the sleeper 13. This plug 18
Includes a main body 19 having an internal thread formed on the inner surface thereof, and an iron wire coil 20 for reinforcing the main body 19 from the outer periphery. The upper part of the main body 19 is open to the rail mounting portion 16.

In the first embodiment, the rail holding member 1
Reference numeral 4 denotes a leaf spring shape. In other words, the rail pressing member 14 has a shape in which a rectangular plate material having spring properties is folded around substantially the center, and the upper plate 21 that is curved and extends.
And a lower plate 23 that curves and extends to form a predetermined gap 22 with the upper plate 21.

At the end of the lower plate 23, the bottom 1 of the rail 11
An abutment portion 24 that abuts on 1a is formed. The contact portion 24 has a stepped shape that matches the side edge shape of the rail bottom 11a. The tip of the upper plate 21 faces the tip of the lower plate 23 when the rail is fastened (see the rail pressing member 14 shown on the left side of the rail 11 in FIG. 1). The upper plate 21 and the lower plate 23 of the rail holding member 14 each have a long hole 25 for inserting the fixing bolt 15.
Are formed, and the long holes 25 extend in the extending direction of the upper and lower plates 23 (the left-right direction in the figure).

The rail holding member 14 is positioned by engaging a base end 26 connecting the upper and lower plates 23 with a corner of a wedge 27 arranged in the recess 17 of the sleeper 13. As shown in FIG. 2, the outer wall surface 17 a of the recess 17 is formed on an inclined surface inclined with respect to the longitudinal direction of the rail 11, and the outer wall surface 27 a of the wedge 27 also has an inclined surface that matches the outer wall surface 17 a of the recess 17. Is formed. Base end 2 of rail holding member 14
6 engages with the inner wall surface 27b of the wedge 27
And are formed in parallel. Therefore, if the wedge 27 is moved in the vertical direction in FIG.
2 moves substantially in the left-right direction in FIG. 2, whereby the mounting position of the rail holding member 14 can be adjusted according to the position of the rail 11 placed on the sleeper 13.

In this state, the fixing bolt 15 is inserted into the elongated holes 25 of the upper plate 21 and the lower plate 23 of the rail holding member 14 and screwed into the main body 19 of the embedding plug 18. When the fixing bolt 15 is screwed in, the contact portion 24 of the lower plate 23 comes into contact with the rail bottom portion 11a, and the rail 11 is fastened and fixed to the sleeper 13.

On the other hand, the tip of the upper plate 21 is
With the screwing of the lower plate 23, the lower plate 23 approaches the upper surface of the distal end by a predetermined amount. Then, a gap between the tip of the upper plate 21 and the tip of the lower plate 23 is determined to a predetermined size (for example, by a gap gauge).
By controlling the thickness of the postcard (about the thickness of a government-made postcard), it is possible to easily and reliably perform the work of tightening a large number of fixing bolts 15 within a predetermined tightening torque range without using a torque wrench.

In particular, the rail fastening device 10 of the first embodiment
In the above, the fixing bolt 15 is formed of a fiber reinforced synthetic resin bolt. The fiber-reinforced synthetic resin is also called glass fiber or FRP, and as is well known, an epoxy resin, a vinyl ester resin, a glass fiber (glass filament), a carbon fiber (carbon filament), or an alumina fiber (alumina filament). Alternatively, it is impregnated with a phenol resin and has excellent electrical insulation and corrosion resistance.

Therefore, by forming the fixing bolts 15 from bolts made of fiber-reinforced synthetic resin, it is possible to fundamentally eliminate the electrolytic corrosion that may occur in the case of the fixing bolts 15 made of metal. As a result, a predetermined tightening force can be secured for a long period of time, the frequency of replacement work of the fixing bolt 15 is reduced, and the durability of the rail fastening device 10 can be improved.

Further, the main body 19 of the plug 18 is made of, for example, nylon or polyester.
Since the fixing bolt 15 itself has electrical insulation, it is not necessary to particularly consider that the material of the main body 19 has electrical insulation, the main body 19 can be formed from an appropriate material, and the degree of freedom of material selection can be increased. Increase.

In the case of a fiber reinforced synthetic resin bolt obtained by cutting a male screw portion on the outer periphery of a general rod made of fiber reinforced synthetic resin with a cutting tool, the filament forming the male screw portion is formed of a screw. Since the cutting is performed at the valley, there is a problem that the tensile strength is reduced and the thread is easily chipped. In the fixing bolt 15 used in the rail fastening device 10, since the thread strength of the male screw portion is required to be relatively large, in the first embodiment, a fiber reinforced synthetic material in which the screw strength of the male screw portion is improved. Uses resin bolts. For fiber-reinforced synthetic resin bolts with improved thread strength,
Details will be described later.

The rail holding member 14 is preferably made of synthetic resin or fiber reinforced synthetic resin.
These synthetic resins and fiber-reinforced synthetic resin materials are excellent in electric insulation and corrosion resistance.

Therefore, by forming the rail holding member 14 from a resin, it is possible to fundamentally eliminate electrolytic corrosion that may occur in the case of the metal rail holding member 14.
As a result, the spring property of the rail holding member 14 can be ensured for a long time, the frequency of replacement work of the rail holding member 14 is reduced, and the durability of the rail fastening device 10 can be improved.

Further, the wedge 27 is made of, for example, nylon or the like. However, since the rail holding member 14 itself has electrical insulation, it is necessary to particularly consider that the material of the wedge 27 has electrical insulation. As a result, the wedge 27 can be formed from an appropriate material, and the degree of freedom in selecting the material is increased. Further, even if a metal plate is provided on the contact portion 24 of the lower plate 23 in order to further prevent the rail 11 from rising, the electrical insulation state can be sufficiently maintained.

<< Molding Example 1 of Bolt Made of Fiber Reinforced Synthetic Resin >>
Next, a description will be given of a first example of forming a fiber reinforced synthetic resin bolt having improved thread strength, which constitutes the fixing bolt 15.

FIG. 3 is a front view showing a fiber reinforced synthetic resin bolt, FIG. 4 is a partially cutaway front view showing the bolt with its head separated, and FIG. 5 shows a main part of the bolt. FIG. 6 is an enlarged sectional view showing a male screw portion of the bolt. 7A to 7E are manufacturing process diagrams of the bolt. FIG. 8 is a perspective view showing an example of forming a textured structure by a tubular string, FIG. 9 is a perspective view showing an example of forming a textured structure by a string,
FIG. 10 is a perspective view showing an example of forming a textured structure using a tape. FIGS. 11A and 11B are cross-sectional views of main parts showing an example of processing a screw material.

As shown in FIGS. 3 and 4, the fiber reinforced synthetic resin bolt 117 has a male thread portion 107a having a thread diameter R.
Are formed, and a head 109 fixed to the screw body 107 and made of the same material as the screw body 107. The screw body 107 includes a body portion 107b having a male screw portion 107a formed near a rear end (right end in the drawing), and a body portion 107 formed at a tip (right end in the drawing) of the body portion 107b.
b, and a neck 107c having a smaller diameter than b.
7c is fitted and fixed in the center hole 109a of the head 109.

A bolt 1 made of a fiber-reinforced synthetic resin having such a structure.
17 will be described with reference to FIGS. 7A to 7E.

First, a filament 102 is assembled to form a core material 102 (FIG. 2A),
Concavo-convex structure 10 composed of filament 111 of the same material as 1
3 is provided on the outer periphery of the core member 102 to form the core body 104 (FIG. 2B). After the core 104 is formed, the core 104 is impregnated with a synthetic resin liquid 105 to form a screw material 106 slightly thicker than the screw diameter R (FIG. 3C). Next, the screw material 106 is heated to appropriately cure the synthetic resin liquid 105, and the appropriately cured screw material 106 is compressed by the heating mold D, and the body portion 107b on which the male screw portion 107a is formed.
To form the screw body 107 having
(E)). The externally threaded portion 107a of the threaded body 107 is formed of the filament 11 of the uneven structure 103,
The filament 111 enters the thread 108 of FIG.

An uneven structure 103 provided on the outer periphery of the core material 102
As the cylindrical string 103A made of the filament 111
(See FIG. 8), a string 103B composed of a filament 111
(See FIG. 9) or a tape 103C (see FIG. 10) composed of a filament 111 is used.

The tubular string 103A has a tubular shape as shown in FIG. The core material 1 is provided inside the cylindrical string 103A.
02 is inserted into the filament 111 of the tubular string 103A.
As a result, an uneven structure 103 is formed. For this reason, the filament 111 of the tubular string 103A is adjusted to the screw inclination angle θ of the male screw portion 107a, and the filament 111 is not cut at the root of the male screw portion 107a as shown in FIGS. Desirably, it will enter thread 108.

On the other hand, in the case of the cord 103B, as shown in FIG.
Uneven structure 103 by filament 111 of string 103B
In the tape 103C, as shown in FIG. 10, the tape 103C is wound around the outer periphery of the core material 102, and the uneven structure 103 is formed by the filament 111 of the tape 103C. For this reason, when winding the string 103B or the tape 103C around the outer periphery of the core member 102, it is desirable to wind the string 103B or the tape 103C in accordance with the screw inclination angle θ of the male screw portion 107a. Irrespective of any deviation, uneven texture 1
It is important to make the surface of No. 03 a complicated structure in which the surface extends in the inner and outer directions, that is, to make it uneven.

As the filament 101 of the core material 102, for example, a bundle of 13 μm glass filaments 101 is used, and as the filament 111 of the uneven structure 103, for example, an ultra-fine glass filament 111 of about 5μ is used. The core material 102 and the texture 103 are preferably made of filaments 101 and 111 that are as thin and strong as possible.
If 11 is used, the filament 111 can be immersed up to the tip of the screw thread 108.

As means for compressing the screw material 106 into the screw body 107, for example, a split mold D which can be separated into an upper mold d1 and a lower mold d2 is used. Upper and lower molds d1, d
A molding surface according to the shape of the screw body 107 is provided on the inner surface of the second die 2, and these upper and lower dies d1 and d2 are attached to the press device so as to be relatively movable toward and away from each other. And both molds d1, d
2 is heated and the screw material 106 is placed on the opened lower mold d2. Then, as shown in FIGS. 11A and 11B, the upper mold d1 is pressed against the lower mold d2 at a predetermined pressure. Tighten. When clamping the upper and lower molds d1 and d2, the uneven structure 103
Of the thread 111 of the male screw portion 107a
The mold clamping pressure, temperature, time, etc. are appropriately adjusted so as to uniformly immerse up to 8.

The core 104 is formed in a rope shape having a slight elasticity when pressed by hand. That is, the core 10
4 is impregnated with the synthetic resin liquid 105 or when the screw material 106 is compressed by the mold D, the filament 10
1, 111 are moved arbitrarily arbitrarily so that they can escape. As the synthetic resin liquid 105 to be impregnated into the core 104, a thermosetting, for example, epoxy-based synthetic resin liquid 105 is used. As a means for impregnating the core 104 with the synthetic resin liquid 105, for example, the core 104 is put into a vacuum impregnating machine, and the synthetic resin liquid 105 is impregnated to all corners in a vacuum state. It is desirable that the screw material 106 is appropriately heated and the synthetic resin liquid 105 is appropriately cured.

The screw body 1 is separated from the screw material 106 by the split mold D.
07, the synthetic resin liquid 105 impregnated in the screw material 106 slightly escapes from the joint (parting line) of the split mold D, and accordingly, a part of the filament 111 also becomes part of the split mold D. May concentrate on the joint. In order to prevent this, it can be solved by adjusting the mold clamping method and time of the split mold D or by rotating the screw material 106 or the like. Although burrs are formed at the joint of the split mold D, when the screw body 107 is taken out from the split mold D, the screw body 107 is rotated and taken out, or the screw body 10 is removed from the split mold D.
After taking out 7, finish processing is performed to remove burrs.

In the fiber reinforced synthetic resin bolt 117 configured as described above, since the filament 101 of the core material 102 is immersed in the longitudinal direction of the screw body 107, the tensile strength is improved. Furthermore, since the filament 111 of the uneven structure 103 is immersed without being cut along the thread 108 of the male screw part 107a, the thread strength of the male screw part 107a is improved. Furthermore, the texture 1
Since the filament 111 of No. 03 is provided in accordance with the screw inclination angle θ, the filament 111 of the uneven structure 103 is more densely inserted into the screw thread 108 of the male screw portion 107a, and the male screw portion 107a is formed by the filament 111. I can do it. As a result, the strength of the male screw portion 107a is dramatically improved, and the screw thread 108 is not damaged. Further, the male screw portion 107a does not need to be cut, and only the simple finishing process needs to be performed.

In the rail fastening device 10 according to the first embodiment, since the fixing bolt 15 composed of the fiber reinforced synthetic resin bolt 117 having an increased thread strength as described above is used, As described above, the predetermined fastening force can be secured for a long period of time, and the durability of the rail fastening device 10 can be improved.

Note that the fiber reinforced synthetic resin bolt 117 in the first embodiment has the filaments 101, 111
, The material of the synthetic resin liquid 105 to be impregnated therein, the content of the synthetic resin liquid 105, and the like are appropriately selected according to the strength and properties required of the screw body 107. In forming the screw body 107 of the fiber-reinforced synthetic resin bolt 117, a filament 111 is used instead of the string 103B.
The uneven structure 103 can be formed by directly winding the core material 102 around the core material 102. Further, instead of the synthetic resin liquid 105,
It is also possible to impregnate a synthetic resin powder. Further, the screw body 107 can be further strengthened by placing the screw body 107 in a hardening furnace and performing hardening again.

In the fiber reinforced synthetic resin bolt constituting the fixing bolt 15, the thread strength of the male thread is increased by making the filament enter the thread without being cut at the root of the male thread. Any method may be used as long as the method is used, and the manufacturing method is not limited to the press molding described above. For example, if a filament that forms a screw thread is provided in advance in accordance with the screw inclination angle, even if the bolt is manufactured by cutting, a filament that is not cut remains in the screw thread. Can be sufficiently secured. Further, the present invention is not limited to the case where it is formed from a round bar, and a fiber reinforced synthetic resin bolt having an increased thread strength can be manufactured from a plate material in which filaments are arranged in a predetermined direction.

<< Example 2 of forming bolts made of fiber reinforced synthetic resin >>
A description will be given of a second example of forming a fiber reinforced synthetic resin bolt having an improved thread strength which constitutes the fixing bolt 15.

In the molding example 2, the fiber-reinforced synthetic resin bolt was formed by stacking a plurality of sheet-shaped molding materials in which the reinforcing fibers impregnated with the thermosetting resin had the opposite angles to each other. It is formed by cutting from a sheet-like molded product, and the thread strength is increased by increasing the delamination strength.

FIG. 12 is a perspective view showing a production apparatus for producing a sheet-like molding material in which the reinforcing fibers impregnated with a thermosetting resin have opposite angles, and FIG. 13 is a mandrel shown in FIG. FIG. 3 is a view showing a state in which a reinforcing fiber is being wound on the slab.

Referring to FIG. 12, a glass fiber roving 200 (600 to 10000 Tex) is traversed by a filament winding machine while impregnating a thermosetting resin when passing through resin impregnated layer 201.
The twill is wound at 02 and wound around the circumferential surface of the cylindrical mandrel 203 at a constant twill angle. The twill angle is preferably 45 ° to 87.5 ° with respect to the rotation axis of the mandrel 203.

As shown in FIG.
Go to 204 consisting of three rovings 200 and 3
The return 205 made of the book roving 200 forms a twill in the opposite direction, and is wound so as to overlap with each other. The winding thickness varies depending on the diameter of the mandrel 203. However, when the wound material is cut open in the axial direction to form a sheet-shaped molding material, 3 mm is used so that wrinkles and the like do not occur.
It is preferable to set it to 10 to 10 mm.

It is very important to wind the roving 200 at a constant angle. For example, roving 20 at an angle of 90 ° with respect to the rotation axis of mandrel 203.
In the case of so-called parallel-wound sheet-shaped molding material in which 0 is wound, when pressed side by side in one direction, there is only resin strength along the direction perpendicular to the fiber direction, and along the fiber direction when force is applied. Cracks easily occur.
When the twill angle is larger than 87.5 °, the winding becomes close to parallel winding, and the effect of each layer pressing each other layer is reduced.
In addition, since the lamination is not made up of several tens of layers as in the case of yarn cloth, when a shearing force is applied to the machined thread, delamination is easy with the resin layer bonding the glass fibers to each other. Will occur. Further, the roving 200 is formed at an angle of 45 ° or less with respect to the rotation axis of the mandrel 203.
Since the sheet-shaped molding material obtained by winding is the same as the sheet-shaped molding material obtained by winding at an angle of θ = 90 ° −45 ° with respect to the rotation axis, the sheet-shaped molding material has an angle of 45 ° or less. Winding has no meaning.

Glass fiber is the cheapest reinforcing fiber for making the sheet-shaped molding material, but carbon fiber and aramid fiber can be used if necessary, and the tensile elastic modulus and the tensile strength are specific lengths. It is not particularly limited as long as it is a fiber. The tensile modulus and the tensile strength vary depending on the strength required for the screw thread. For example, the tensile modulus is 6000 kg / mm 2 or more and the tensile strength is 100 kg.
/ Mm2 or more.

When the roving 200 has been wound around the mandrel 203 to a predetermined thickness, the cylindrical body formed by winding is cut and expanded by one straight line parallel to the axis of the mandrel 203. Thereby, a sheet-shaped molding material is obtained. Next, a plurality of sheet-like molding materials are stacked in different directions, and press-heat-molded to form a sheet-like molded product. Then, a cutting process is performed on the sheet-shaped molded product to produce a bolt having a predetermined shape.

The characteristic of the sheet-like molding material made by filament winding is that, as shown in FIG. 13, the stretching direction of the roving 200 wound on the mandrel 203 is opposite to each other in the axial direction and the return direction. That is. In addition, since the surface of the mandrel 203 is completely covered only by a pair of layers in which the stretching direction of the roving 200 is opposite, the sheet-shaped molding material is
The two layers in which the stretching directions are opposite are the minimum units,
Will be made.

In order to form a sheet-like molded product by laminating the sheet-like molding materials and press-heating the same, a thermosetting resin such as an epoxy resin, an unsaturated polyester resin, or a vinyl ester resin is used as the resin of the resin-impregnated layer 201. Used.

As described above, according to the molding example 2, first, the reinforcing fibers made of long fibers are wound and wound so as to form a layer at a symmetrical twill angle with respect to the plane perpendicular to the axis, and then cut and spread. By forming a sheet-shaped molding material by this, then, a plurality of the sheet-shaped molding material is laminated and press-molded to form a sheet-shaped molding, and then, the sheet-shaped molding is cut into a bolt shape. Thus, a fiber reinforced synthetic resin bolt with improved thread strength is manufactured.

The reason why the thread strength of such a bolt is improved is as follows. In other words, the glass fiber roving enters into the thread, and the roving layer with the opposite direction is pressed by the roving layer with the opposite direction, and this layer is further pressed by the roving layer with the opposite direction. This is because the layers in the directions press each other, and the delamination strength generated when the thread breaks is increased.

Further, in the molding example 2, since there is no weaving step and no twisted yarn or the like is required as the reinforcing fiber, it is possible to produce a fiber-reinforced synthetic resin bolt which is very inexpensive in terms of cost.

Second Embodiment FIG. 14 is a sectional view showing a rail fastening device 10 according to a second embodiment.

In the second embodiment, the shape of the rail pressing member 34 is modified. The rail pressing member 34 is different from the rail pressing member 14 of the first embodiment in that the rail pressing member 34 has a leaf spring shape. are doing.

The rail holding member 34 has a substantially rectangular cross section, a contact portion 35 for contacting the rail bottom 11a is formed at the front end, and a bulging portion 36 for engaging the wedge 27 is formed at the rear end. ing. Also, a fiber reinforced synthetic resin bolt 11
A through hole 37 through which the fixing bolt 15 composed of the fixing member 7 is inserted is formed at the center.

The rail holding member 34 is also made of a synthetic resin such as nylon 66 or a fiber-reinforced synthetic resin material to improve electrical insulation and corrosion resistance, and to improve the durability of the rail fastening device 10. be able to.

[0062]

As described above, according to the first to third aspects of the present invention, since the fixing bolt is made of a fiber-reinforced synthetic resin bolt having an increased thread strength, the fixing bolt is not required. Electrolytic corrosion is fundamentally eliminated, a predetermined tightening force can be sufficiently secured for a long period, and the durability of the rail fastening device is improved.

According to the fourth aspect of the present invention, the rail holding member is made of a synthetic resin or a fiber-reinforced synthetic resin, so that the rail holding member can be basically prevented from being electrically eroded, and the rail fastening device can be provided. The durability can be further improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rail fastening device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a rail holding member and the like used in the rail fastening device.

FIG. 3 is a front view showing a fiber reinforced synthetic resin bolt.

FIG. 4 is a partially cutaway front view showing the bolt with its head separated.

FIG. 5 is an enlarged sectional view showing a main part of the bolt.

FIG. 6 is a longitudinal sectional view showing a male screw portion of the bolt.

FIGS. 7A to 7E are manufacturing process diagrams of the bolt.

FIG. 8 is a perspective view showing an example of forming a textured structure using a tubular string.

FIG. 9 is a perspective view showing an example of forming a textured structure using a string.

FIG. 10 is a perspective view showing an example of forming a textured structure using a tape.

FIGS. 11A and 11B are cross-sectional views of a main part showing an example of processing a screw material.

FIG. 12 is a perspective view showing a manufacturing apparatus for manufacturing a sheet-shaped molding material in which the reinforcing fibers impregnated with a thermosetting resin have the opposite angles of the reinforcing fibers.

FIG. 13 is a view showing a state in which reinforcing fibers are being wound around the mandrel shown in FIG. 12;

FIG. 14 is a cross-sectional view illustrating a rail fastening device according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rail fastening device 11 ... Rail 11a ... Rail bottom part 13 ... Sleeper 14, 34 ... Rail holding member 15 ... Fixing bolt 24, 35 ... Contact part 101 ... Filament 102 ... Core material 103 ... Uneven structure 104 ... Core body 105 ... Synthetic resin liquid 106 ... Screw material 107 ... Screw body 107a ... Male thread 108 ... Thread 111 ... Filament 117 ... Bolt made of fiber reinforced synthetic resin R ... Screw diameter θ ... Screw inclination angle 200 ... Roving (reinforced fiber) 203 ... Mandrel

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Osamu Takayama 16-86, Togane-shi, Chiba Pref. (72) Inventor Yutaka Sakano 1-9-12 Nakatakatsu, Tsuchiura-shi, Ibaraki Pref. Nin 4-36-5 302 Konandai, Konan-ku, Yokohama, Kanagawa Prefecture (72) Inventor Toshihide Someya 2-6-407, Namiki, Kanazawa-ku, Yokohama, Kanagawa Prefecture (72) Inventor Isao Tajima Tomika Nishi, Nara City, Nara Prefecture Oka 5-11-17 (72) Inventor Yuji Yoneya 59, Higashi-Iritsuki, Manjuji-dori Nishi-Doin, Shimogyo-ku, Kyoto, Kyoto

Claims (4)

[Claims] 1. A sleeper (1) on which a rail (11) is mounted.
3), a rail holding member (14) formed with an abutment portion (24) that comes into contact with the bottom (11a) of the rail (11), and the rail holding member (14) with respect to the sleeper (13). A fixing bolt (15) for fixing the rail (11) to the crossties (13) by fixing the fixing bolt (15), wherein the fixing bolt (15) is a fiber having an increased thread strength. A rail fastening device comprising a reinforced synthetic resin bolt. 2. A fiber-reinforced synthetic resin bolt (117) constituting the fixing bolt (15) is provided with a filament (1).
The thread strength of the male screw portion (107a) is increased by inserting the screw thread (108) into the screw thread (108) without being cut at the root portion of the male screw portion (107a). 2. The rail fastening device according to 1. 3. A bolt made of a fiber-reinforced synthetic resin constituting the fixing bolt (15) is formed by stacking a plurality of sheet-like molding materials in which the reinforcing fibers impregnated with a thermosetting resin have the opposite angles to each other. The rail fastening device according to claim 1, wherein the rail fastening device is formed by cutting from the formed sheet-like molded product, and enhances the thread strength by increasing the delamination strength. 4. The rail fastening device according to claim 1, wherein the rail holding member (14) is made of a synthetic resin or a fiber-reinforced synthetic resin.