JP3034455B2 - Seam plate for rail - Google Patents

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 rail joint plate which is lighter in weight. is there.

[0002]

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

[0003] The joint plate is connected to the end of each adjacent rail by a fastener such as a bolt. That is,
Adjacent rails are connected by this seam plate.

On the other hand, a rail provided at a place where a traffic signal or a level crossing alarm is installed needs to form an electric circuit in a certain section including the signal or the level crossing alarm.
Therefore, the seam plate connecting the rails in the certain section needs to have insulating properties. As described above, the seam plate connecting the rails in a certain section forming the electric circuit is generally called an insulating seam plate to distinguish it from the seam plate connecting the rails in other sections that do not require insulation. .

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

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

[0007] In order to eliminate such poor workability, a seam plate in which the entire seam plate is formed of a fiber-reinforced thermosetting resin has been provided (for example, Japanese Patent Laid-Open Publication No. Sho 5).
0-47301 and JP-A-7-145601).

According to the resin seam plate, the insulating plate 53 and the insulating tube 54 are lightweight and have good workability.
The insulating property can be ensured without interposing such an insulating member.

[0009]

By the way, in such a conventional joint plate made of fiber-reinforced thermosetting resin,
70% of the rovings, which are reinforcing fibers, are oriented in the longitudinal direction (the direction along the rail).

[0010] When such a seam plate made of fiber-reinforced thermosetting resin is attached between the rails and tightened with a bolt to a specified torque, the axial force per bolt is 16
ton.

[0011] For this reason, in the case of reinforcing with only fibers oriented in the longitudinal direction, such as the above-mentioned conventional seam plate made of fiber-reinforced thermosetting resin, the compressive strength against the axial force of the bolt is insufficient, and the bolt is tightened. There is a problem that a crack may be formed in the longitudinal direction of the joint plate.

SUMMARY OF THE INVENTION The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a rail joint plate having sufficient strength against the axial force of a bolt, light weight and good workability. Is to provide.

[0013]

In order to solve the above-mentioned problems, a rail joint plate according to the present invention is provided so as to straddle between end side surfaces of adjacent rails and to be fixed by bolts. A rail joint plate made of a fiber-reinforced thermosetting resin that is fastened and fixed to a rail, wherein straight long fibers are laminated along the vertical direction on the front side of a surface facing the rail. .

That is, the linear long fibers are laminated in a direction parallel to the vertical tensile stress acting on the surface facing the rail by the compressive force of the axial force of the bolt. Thereby, sufficient strength can be given to the compressive force due to the axial force of the bolt.

[0015]

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, FIG.
3 and 4 are a front view and a longitudinal sectional view showing a state where the seam plate is attached to the rail.

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 formed on a substantially flat surface. Further, four through holes 7a, 7a, 7b, 7b are formed in the facing surface 2 along its width direction, and two through holes 7a, 7a on the left side and two through holes 7a on the right side. Hole 7b,
7b are paired with each other.

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

The seam plate 1 formed in this manner is connected to the adjacent rails 1 with a certain gap p allowing thermal expansion and contraction.
It is attached in a state as shown in FIGS.

That is, as shown in FIG. 4, the rail 10 has a base 1 which is a portion attached to a sleeper (not shown).
1, a head 13 which is a portion where a wheel of a train (not shown) contacts, and a column 12 formed narrower than the base 11 and the head 13.

The seam plate 1 has the upper inclined surface 3 abutting along the lower surface of the head 13 of the rail 10 and the lower inclined surface 4 abutting along the upper surface of the base 11 of the rail 10. The opposing surface 2 is disposed so as to have a slight gap with respect to the pillar portion 12 of the rail 10.

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

In the drawing, reference numeral 15 denotes a bolt insertion hole formed in the rail 10, and reference numeral 16 denotes a through hole 7 of the joint plate 1.
a (7b) and a bolt inserted into the bolt insertion hole 15 of the rail 10, reference numeral 17 denotes a nut, and reference numeral 18 denotes a washer.

The reason why the concave portion 8a is provided at the center of the outer surface 8 of the seam plate 1 to make it thinner than other portions is that the rigidity in the vertical direction is reduced and the seam plate 1 is attached to the rail 10 by bolts 16. This is because the seam plate 1 is easily brought into close contact with the base 11 and the head 13 of the rail 10 when tightening.

In the above configuration, the seam plate 1 of the present invention
As shown in FIGS. 1 and 2, a linear long fiber 5 is laminated on the front side of the facing surface 2 of the rail 10 along the vertical direction. The long fibers 5 may be laminated on the surface of the facing surface 2, or may be laminated while being slightly embedded from the surface.

As the thermosetting resin used as the material of such a seam plate 1, unsaturated polyester resin, epoxy resin, vinyl ester resin, phenol resin and the like are preferably used. Considering the above, a vinyl ester resin excellent in moldability is most preferable.

As the reinforcing fiber used as the material of the seam plate 1, only the carbon fiber is used for the front side portion. For the central portion, glass fiber, carbon fiber, aramid fiber, acrylic fiber, vinylon fiber and the like are suitably used, and these are used alone or in any combination.
As the form of the fiber, roving, chopped strand mat, continuous mat, roving cloth, or the like is used, and these are used alone or in any combination.

As the linear long fiber 5, a barbed roving having no meandering fiber is used . Further, the amount of the linear long fibers 5 stacked in the vertical direction is desirably 2 to 5% of the total glass fiber amount.

As a method for manufacturing the seam plate 1 having the above structure, a conventionally known fiber-reinforced synthetic resin molding method such as a pultrusion molding method, a press molding method, and a reaction injection molding method can be employed. The pultrusion method is most advantageous in terms of lamination properties and the like.

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

The seam plate 1 made of fiber reinforced thermosetting resin is
Because of its light weight, it can be carried with one hand, and one worker can carry and carry one set. Further, when used as an insulating seam plate, the surface is covered with a glass fiber reinforced thermosetting resin as an insulator, so that the insulating performance is high and high insulating reliability can be expected.

[0032]

Next, an embodiment of the seam plate 1 having the above-described 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 currently used steel 50 kg N-type rail joint plate.

The molding method is as follows. The following reinforcing fibers are immersed in a liquid thermosetting resin mixed with a curing agent, and the reinforcing fibers are introduced into a mold having an inner surface shape adapted to the cross-sectional shape of the seam plate. The mold is heated while being pulled out, cured in the longitudinal direction of the mold, and cut into fixed lengths. The bolt insertion hole is opened at a specified position by a hold cutter after cutting the fixed length.

The seam plate 1 of this embodiment is formed by laminating two interdigital rovings (straight long fibers) 5 shown in FIG. 5 on the front side of the facing surface 2 of the rail 10 along the vertical direction. In the present embodiment, the interdigitated rovings 5 are rovings 5a, 5a,... Cut to a predetermined length and joined by three threads 5b, 5b, 5b arranged in a lateral direction.

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

Reinforcing fibers: glass roving (Asahi Fiber Co., Ltd., 4450), continuous strand mat (Asahi Fiber Co., Ltd., 450), glass cloth (Nippon Sheet Glass Co., Ltd., 580). Thermosetting resin: vinyl ester resin. Curing agent: organic peroxide (t-butylperoxybenzoate).

In the present embodiment, four types of seam plates 1 were prepared with the amount of interdigitated rovings laminated on the front side of the opposing surface 2 being 0, 2, 3, and 5%, and the strength against bolting was compared. Was. FIG. 6 shows the comparison result as a list.

In this comparison result, the denominator is the number of seam plates manufactured, and the numerator is the number of the seams destroyed by bolting.

From the result of this comparison, the opposite surface 2 of the rail 10
It can be seen that the strength with respect to the axial force of the bolt is greatly improved by laminating the interdigital rovings on the front side.

[0041]

The rail joint plate of the present invention has a structure in which interdigital rovings are laminated on the front side of the surface facing the rail so that linear long fibers are arranged along the vertical direction. > As a result, it is possible to provide sufficient strength against the vertical tensile stress acting on the surface facing the rail by the compressive force due to the axial force of the bolt, improving the reliability as a seam plate. is there.

[Brief description of the drawings]

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

FIG. 2 is a cross-sectional view of the rail joint plate of the present invention.

FIG. 3 is a front view showing a state where a seam plate is attached to a rail.

FIG. 4 is a longitudinal sectional view showing a state where a seam plate is attached to a rail.

FIG. 5 is a plan view of an interdigital roving.

FIG. 6 is a table showing comparison results of strength against bolt tightening.

FIG. 7 is a longitudinal sectional view showing a state where a conventional joint plate is attached to a rail.

[Description of Signs] 1 Seam plate 3 Upper inclined surface 4 Lower inclined surface 5 Straight long fiber (interdigital roving) 10 Rail

Claims (1)

(57) [Claims] 1. A rail joint plate made of a fiber-reinforced thermosetting resin that is disposed between end side surfaces of adjacent rails and that is fastened and fixed to the rails with bolts. The rail seam plate is an interdigitated robin such that straight long fibers are arranged along the vertical direction on the front side of the surface facing the rail.
Seam plate for rails, characterized in that the rails are laminated.