JPH09143901A - Fish plate for rail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart with a rail fish plate having necessary stiffness and strength both in the longitudinal direction of fish plate and in the direction perpendicular thereto. SOLUTION: A rail fish plate concerned 1 to be installed as striding over the side faces of the end parts of two adjoining rails, is formed from a thermo- hardening resin reinforced with continuous fibers and a woven or non-woven cloth of glass fibers. The content by wt. of reinforcing fibers should be 65-80%, among which the share of continuous fibers oriented in the longitudinal direction of the fish plate should range between 60% and 80%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail joint plate disposed between end side surfaces of adjacent rails, and more particularly to a longitudinal direction of the joint plate and a direction orthogonal to the longitudinal direction. The present invention relates to a rail joint plate having rigidity and strength required for each of the above.

[0002]

2. Description of the Related Art Conventionally, at a connecting portion of railroad rails, a member called a seam plate is arranged so as to extend between side surfaces of end portions of adjacent rails.

This joint plate is connected to the ends of adjacent rails by tightening tools such as bolts. That is, the adjacent rails are connected by this joint plate.

By the way, it is necessary to form an electric circuit in a rail provided at a location where a traffic signal or a railroad crossing alarm is installed in a certain section including the traffic light or the railroad crossing alarm.
Therefore, the joint plate that connects the rails in the certain section needs to have an insulating property. As described above, the joint plate that connects the rails of a certain section forming the electric circuit is generally called an insulating joint plate to distinguish it from the joint plate that connects the rails of other sections that do not require insulation. .

On the other hand, since the seam plate made of steel which is an electric conductor cannot be used as it is as an insulating seam plate, conventionally, as shown in FIG. 6, an insulating plate is provided between the rail 51 and the seam plate 52. The insulation is ensured by interposing 53 and the insulating tube 54.

However, such a joint plate 52 made of steel is heavy and has a poor workability when mounted on the rail 51. Further, when the ordinary joint plate 52 is used as the insulating joint plate, it is necessary to interpose the insulating plate 53 and the insulating tube 54 as described above.
The number of man-hours required for work on the site increases, and in this respect, workability when mounting on the rail 51 is poor.

In order to eliminate such poor workability, there is provided a seam plate in which the whole seam plate is made of a fiber-reinforced thermosetting resin (for example, Japanese Patent Laid-Open No. Sho 5).
0-47301, JP-A-7-145601).

According to this seam plate made of resin, the weight and workability are excellent, and the insulating plate 53 and the insulating tube 54 are provided.
Insulation can be secured without interposing such an insulating member.

[0009]

Since the seam plate made of such a fiber-reinforced thermosetting resin is reinforced with fibers, it is resistant to a load such as tension or compression in the direction in which the fibers are oriented. However, the strength in the direction orthogonal to the alignment direction is not so large.

A bending load is applied to the seam plate due to the bending of the rail when the train passes, and a tensile stress in the longitudinal direction is generated particularly in the lower part of the seam plate and a compressive stress in the longitudinal direction is generated in the upper part. Further, the rail is also subjected to tension and compression in the longitudinal direction due to thermal expansion and contraction.

Separately from this, when the seam plate is attached to the rail, since the seam plate is tightened with a considerable torque by a bolt or the like, a compressive stress is applied to the seam plate in the direction orthogonal to the longitudinal direction by the axial force of the bolt. Occurs.

Therefore, the joint plate must have rigidity and strength capable of withstanding the stress generated both in the longitudinal direction and in the direction orthogonal to the longitudinal direction.

However, since the above-mentioned seam plate made of fiber-reinforced thermosetting resin can strengthen only mainly in the fiber orientation direction, it is the same in both the longitudinal direction and the direction orthogonal to the longitudinal direction. As described above, there is a problem that it is difficult to provide rigidity and strength.

The present invention was devised to solve such problems, and its purpose is to provide a rail having rigidity and strength required both in the longitudinal direction of the joint plate and in the direction orthogonal to the longitudinal direction. It is to provide a seam board for use.

[0015]

In order to solve the above-mentioned problems, a rail joint plate according to claim 1 of the present invention is a rail joint plate which is disposed so as to straddle between end side surfaces of adjacent rails. It is made of thermosetting resin reinforced by continuous fibers of glass fiber and woven or non-woven fabric, and the weight content of the reinforcing fiber is 65-65.
80%, of which the proportion of continuous fibers oriented in the longitudinal direction of the joint plate is 60-80%.

That is, since it is formed of a thermosetting resin reinforced by glass fibers, it is possible to reduce the weight by about 1/3 to 1/5 as compared with the case of steel and the resin. Since it is manufactured, it does not require an insulating member,
The workability is also excellent. In addition, since the bending elastic modulus in the longitudinal direction of the seam plate can be secured to 25 GPa or more, it has sufficient durability against repeated bending stress due to the load when passing the train, and also has tensile stress due to thermal expansion and contraction of the rail. It will endure. Also, by providing a plurality of layers of woven or non-woven fabric of reinforcing fibers to secure 20 to 40% of fibers oriented in a direction other than the longitudinal direction, it is also sufficient for compressive load due to bolt tightening when mounting on rails. Will be able to withstand.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of a rail joint plate (hereinafter simply referred to as a joint plate) of the present invention, and FIGS. 2 and 3 are a front view and a vertical sectional view showing a state where the joint plate is attached to a rail. is there.

The joint plate 1 of the present invention is formed in a horizontally long flat plate shape and has a surface 2 facing a rail 10 described later.
Is slightly curved, but is formed on a substantially flat surface. Further, the opposing surface 2 is formed with four through holes 7a, 7a, 7b, 7b along the width direction thereof. The two through holes 7a, 7a on the left side and the two through holes on the right side are formed. Hole 7b,
7b and 7b are paired with each other.

A surface (outer surface) 8 opposite to the facing surface 2 is provided.
Is formed in a concavo-convex shape, and the concave portion 8a serves as a fitting groove for a bolt 16 or a nut 17 described later.

The seam plate 1 thus formed is adjacent to the rails 1 with a constant clearance p allowing thermal expansion and contraction.
It is attached in a state as shown in FIGS. 2 and 3 straddling the side surfaces of the end portions of 0 and 10.

That is, as shown in FIGS. 2 and 3, the rail 10 has a base portion 11 which is a portion to be attached to a sleeper (not shown), a head portion 13 which is a portion to which a wheel of a train (not shown) comes into contact, a base portion 11 and The column portion 12 is formed to be narrower than the head portion 13.

In the seam plate 1, the upper inclined surface 3 is in contact with the lower surface of the head portion 13 of the rail 10 and the lower inclined surface 4 is in contact with the upper surface of the base 11 of the rail 10. The facing surface 2 is disposed so as to have a slight gap with respect to the column portion 12 of the rail 10.

That is, the joint plate 1 has a structure in which it contacts the rail 10 only through the upper inclined surface 3 and the lower inclined surface 4.

In the figure, reference numeral 15 is a bolt insertion hole formed in the pillar portion 12 of the rail 10, and reference numeral 16 is a joint plate 1.
Through hole 7a (7b) and the bolt insertion hole 1 of the rail 10
5, a bolt is inserted through 5, reference numeral 17 is a nut, and reference numeral 18 is a washer.

Further, the recess 8a is provided in the central portion of the outer surface 8 of the seam plate 1 so as to be thinner than the other portions so that the rigidity in the vertical direction is reduced and the seam plate 1 is attached to the rail 10 by the bolt 16. This is because the joint plate 1 can be easily brought into close contact with the base portion 11 and the head portion 13 of the rail 10 when tightening.

In the above structure, the joint plate 1 of the present invention
Is formed of a continuous fiber of glass fiber and a thermosetting resin reinforced by a woven or non-woven fabric, and the weight content of the reinforcing fiber is 65 to 80%, of which the longitudinal direction of the joint plate 1 (width in FIG. 1). The ratio of the continuous fibers oriented in the (direction) is 60 to 80%.

As the thermosetting resin used as the material for the joint plate 1, unsaturated polyester resin, epoxy resin,
Vinyl ester resins and phenol resins are preferably used, but vinyl ester resins having excellent moldability are most preferable in consideration of fatigue strength, elongation, heat resistance and the like.

As the reinforcing fiber used as the material of the joint plate 1, glass fiber is used. As the form of the fiber, glass roving is used for continuous fibers, glass cloth, roving cloth for woven cloth,
A suede-woven cloth is used. Further, as the non-woven fabric, chopped strand mat, continuous mat, etc. are used, and by using these together, the desired rigidity and strength can be obtained.

The continuous fiber used here means a fiber having a length of at least about 1/5 or more of the length of the seam plate 1, specifically, a fiber having a length of about 100 mm or more.

The bending elastic modulus in the longitudinal direction of the seam plate 1 is 25.
If it is not over GPa, the load when passing the train (16 tons)
On the other hand, the bending strain becomes large and there is a possibility of breaking due to repeated loading. Flexural modulus of 25 GPa
To achieve the above, the fiber content should be 65% by weight or more, and the proportion of continuous fibers oriented in the longitudinal direction should be 60%.
% Or more.

However, if the fiber content is 80% by weight or more, the amount of resin that binds the fibers is reduced, and it becomes difficult to obtain the required rigidity and strength. Therefore, the fiber content is 80% by weight or less. To do.

Further, the torque (5 ton · s) to the bolt 16 tightened from the direction orthogonal to the longitudinal direction of the seam plate 1.
If the compressive elastic modulus is not more than about 8 GPa with respect to cm, there is a possibility of breaking. Therefore, the fiber content is 65
Even in the case where the content of the reinforcing fibers is more than 1% by weight, the reinforcing fibers oriented in the longitudinal direction of the seam plate 1 and the direction orthogonal to the longitudinal direction are contained in
Must be 0% or higher. For these reasons,
The weight content of the reinforcing fibers is 65 to 80%, of which the proportion of continuous fibers oriented in the longitudinal direction of the joint plate 1 is 60 to 8.
It needs to be 0%.

For that purpose, it is necessary to laminate a plurality of layers, such as woven or non-woven fabric, in which the fibers are oriented other than in the longitudinal direction, between the continuous fibers oriented in the longitudinal direction such as roving. Desirably, about 5 to 10 layers of woven or non-woven fabric including the surface of the joint plate 1 are provided.

In this case, the woven or non-woven fabric layer means
One woven cloth or non-woven cloth may be one layer, or a plurality of woven cloth or non-woven cloth may be laminated to form one layer.

As a method for manufacturing the joint plate 1 having the above-mentioned structure, conventionally known fiber-reinforced synthetic resin molding methods such as a pultrusion molding method, a press molding method and a reaction injection molding method can be adopted. The pultrusion method is the most advantageous in terms of stackability, high fiber content, and the like.

In the pultrusion molding method, the reinforcing fibers impregnated with the thermosetting resin are drawn and aligned, and then the fibers are heated while being continuously transferred into a mold having an inner surface shape suitable for the cross-sectional shape of the seam plate 1. After hardening and pulling out, it is cut into a predetermined size, and finally a bolt insertion hole is opened.

According to the seam plate 1 of the present invention, since it is formed of the thermosetting resin reinforced by the glass fiber, the weight is reduced to about 1/3 to 1/5 as compared with the case of steel. Since it is made of resin, it does not require an insulating member and is excellent in workability.

In the joint plate 1 of the present invention, the weight content of the reinforcing fibers is 65 to 80%, and the proportion of continuous fibers oriented in the longitudinal direction of the joint plate 1 is 60 to 80%. The bending elastic modulus in the longitudinal direction of the plate 1 is 25 GPa
The above can be ensured, and it has sufficient durability against repeated bending stress due to the load at the time of passing the train, and can withstand the tensile stress due to thermal expansion and contraction of the rail 10.

Further, by providing a plurality of layers of woven or non-woven fabric of reinforcing fibers to secure 20 to 40% of fibers oriented in a direction other than the longitudinal direction, it is possible to tighten the bolts 16 when mounting on the rail. It can withstand a compressive load sufficiently.

The joint plate 1 of the present invention is preferably used as an insulating joint plate, but it is of course possible to use it as an ordinary joint plate.

[0042]

EXAMPLE Next, an example of the joint plate 1 having the above-mentioned structure will be described.

The seam plate 1 of this embodiment has a length L = 560.
mm, height H = 105 mm, thickness T≈55 mm,
It is formed into almost the same shape as the steel 50kg N-type rail joint plate currently used.

The molding method is as follows. Several reinforcing fibers other than roving among the following reinforcing fibers are selected and piled up, and a plurality of layers are inserted between the roving layers. Then, after that, the layered reinforcing fibers are immersed in a liquid thermosetting resin in which a curing agent is mixed, and the reinforcing fibers are heated while being introduced into a mold having an inner surface shape adapted to the cross-sectional shape of the joint plate, It is pulled out in the longitudinal direction of the mold, cured, and cut to a standard size.

The bolt insertion hole is opened at a prescribed position by a hold cutter after cutting the standard length.

Details of the raw materials used at this time are as follows.

Reinforcing fiber: glass roving (# 4450 manufactured by Asahi Fiber Co., Ltd.), continuous strand mat (# 450 manufactured by Asahi Fiber Co., Ltd.), glass cloth (# 580 manufactured by Nippon Sheet Glass Co., Ltd.), interdigital cloth (# 450 manufactured by Nippon Sheet Glass Co., Ltd.). 600). Thermosetting resin: Vinyl ester resin. Hardener: Organic peroxide (t-butyl peroxybenzoate).

Fiber content by the above materials and molding method,
The seam plate 1 was formed by changing the ratio of continuous fibers. The details are shown in a list in FIG.

The sample thus produced was mounted between the end side surfaces of the adjacent rails 10 and 10 using bolts 16, nuts 17 and washers 18 as shown in FIG.
The tightening torque at this time was limited to 5 ton / cm.

Then, a repeated oscillating bending load of 5 tons was applied to the center portion (the portion of the gap p between the adjacent rails 10 and 10) shown in FIG. 2 up to a limit of 2 × 10 ⁶ . After that, the sample was removed and the degree of damage to the sample (joint plate) was visually observed. Further, the degree of damage to the joint plate when tightened with the bolt 16 was also visually observed. The results are shown in the table of FIG.

From the table shown in FIG. 5, if the bending elastic modulus in the longitudinal direction is too low or the compressive elastic modulus in the direction orthogonal to the longitudinal direction is too low, the strength is insufficient. Further, if the glass fiber content is too high, molding cannot be performed. That is, it can be seen that the fiber content of the present invention is the best.

[0052]

The rail joint plate according to claim 1 of the present invention is formed of thermosetting resin reinforced by continuous fibers of glass fiber and woven or non-woven fabric, and the weight content of the reinforcing fibers is 65-80%, of which the proportion of continuous fibers oriented in the longitudinal direction of the joint plate is 6
Since it is 0 to 80%, it is about 1/3 of that of steel.
The weight can be reduced to about ⅕, and since it is made of resin, it does not require an insulating member and is excellent in workability. In addition, since the bending elastic modulus in the longitudinal direction of the seam plate can be secured to 25 GPa or more, it has sufficient durability against repeated bending stress due to the load when passing the train and also has a tensile stress due to thermal expansion and contraction of the rail. It can bear. In addition, a plurality of layers of woven or non-woven fabric of reinforcing fibers are provided, and fibers oriented in directions other than the longitudinal direction are
By securing 0 to 40%, it is possible to sufficiently withstand the compressive load due to the bolt tightening at the time of mounting on the rail.

[Brief description of the drawings]

FIG. 1 is a perspective view of a rail joint plate of the present invention.

FIG. 2 is a front view showing a state where a joint plate is attached to a rail.

FIG. 3 is a vertical cross-sectional view showing a state where a joint plate is attached to a rail.

FIG. 4 is a table showing details of changes in a fiber content rate and a continuous fiber rate separately for an example and a comparative example.

FIG. 5 is a list showing the results of Examples and Comparative Examples.

FIG. 6 is a vertical cross-sectional view showing a state in which a conventional joint plate is attached to a rail.

[Explanation of symbols]

 1 seam plate 3 upper inclined surface 4 lower inclined surface 10 rail

Claims (1)

[Claims] 1. A seam plate for rails which is disposed so as to straddle between the end side surfaces of adjacent rails, the seam plate for rails being reinforced by continuous fibers of glass fiber and woven or non-woven fabric. A rail joint plate, wherein the weight content of the reinforcing fibers is 65 to 80%, and the proportion of the continuous fibers oriented in the longitudinal direction of the joint plate is 60 to 80%.