JPH09143903A - Fish plate for rail - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an inter-layer shearing destruction between a mat layer and robing layer and preclude stress concentration occurred at the end of the mat layer. SOLUTION: A fish plate 1 for rails is formed from a fiber-reinforced thermohardening resin installed as striding over the side faces of the end parts of two adjoining rails and fastened thereto by bolts. The joint plate 1 is formed from a mat layer 1a and a robing layer 1b, wherein the mat layer 1a is laminated vertically to the compressive forces m, n applied to the surface of the joint plate 1. The two ends 1c, 1d of the mat layer 1a are extended toward the outer surface 8 nearer than the plane formed by tying the rear end 3a of the upper inclined surface 3 to the rear end 4a of the lower inclined surface 4.

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 made of a fiber reinforced thermosetting resin, which is disposed so as to straddle between end side surfaces of adjacent rails, and more specifically, to improve strength. The present invention relates to a rail joint plate.

[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 seam plate is connected to the ends of adjacent rails by tightening tools such as bolts. That is,
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. 7, 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.

Therefore, in order to eliminate such poor workability, there is provided a seam plate in which the whole seam plate is formed of a fiber-reinforced thermosetting resin having a mat layer and a roving layer as reinforcing fibers. For example, JP-A-50-473
No. 01, Japanese Patent Application Laid-Open No. 7-145601).

Here, the mat layer and the roving layer are used as the reinforcing fibers for the following reason. That is, if the reinforcing fiber is only the mat layer, the density of the fiber is low, the ratio of the thermosetting resin is large, and the strength is lowered. This is because the tensile force is strong but the fiber is weak against the force from the vertical direction, and the fibers are scattered.

According to such a seam plate made of resin, it is lightweight and has good workability, and the insulating property can be secured without interposing an insulating member such as the insulating plate 53 or the insulating tube 54.

[0010]

However, in the case of a joint plate made of a fiber reinforced thermosetting resin composed of a mat layer and a roving layer, when it is mounted between rails and a load similar to that when passing a train is applied, a bending load is applied. Compressive force on the upper rail contact surface, tensile stress on the lower rail contact surface, bolt 5
Since various loads such as compressive stress due to the axial force of tightening of No. 5 are applied, there is a problem that shear failure occurs between the mat layer and the roving layer, resulting in fatigue failure.

As one of the causes of the shear fracture that occurs between the mat layer and the roving layer, it is considered that the stress is concentrated on the end portion of the mat layer.

That is, in the conventional joint plate 52, as shown in FIG.
As shown in FIG.
Is the rear end portion 56a of the upper inclined surface 56 and the lower inclined surface 5
Since it extends only to the vicinity of the rear end portion 57a of No. 7, stress concentrates on both end portions 52c and 52d of the mat layer 52a.

The present invention was devised to solve the above problems, and its purpose is to prevent shear failure between the mat layer and the roving layer and to prevent the occurrence of shear failure at the edges of the mat layer. It is intended to provide a rail joint plate for preventing stress concentration.

[0014]

In order to solve the above-mentioned problems, a rail joint plate according to claim 1 of the present invention is arranged so as to straddle between end side surfaces of adjacent rails, and the rail joint plate is formed by a bolt. A rail joint plate made of a fiber-reinforced thermosetting resin that is fastened and fixed to a rail, which is formed by a mat layer and a roving layer, and in which the mat layer has a compressive force applied to the surface of the joint plate. In contrast, they are vertically stacked. That is,
Since the mat layer is laminated perpendicularly to the compressive force, shearing force does not work between the mat layer and the roving layer, so that the mat layer has sufficient strength against these compressive forces.

In the rail joint plate according to a second aspect of the present invention, the mat layer is laminated perpendicularly to the compressive force due to the tightening of the bolt and the compressive force applied to the contact surface with the rail. It was done.

Further, in the rail joint plate according to a third aspect of the present invention, the end portion of the mat layer laminated perpendicularly to the compressive force applied to the contact surface with the rail has a contact surface with the rail. It has been extended to the outside. That is,
Since the end of the mat layer is not located in the high stress area,
The stress concentration is small, and the structure has excellent static strength and fatigue strength.

[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 FIG. 2 is a sectional view.
3 and 4 are a front view and a vertical sectional view showing a state in which the joint 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 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. 3 and 4 straddling the side surfaces of the end portions of 0 and 10.

That is, as shown in FIG. 4, the rail 10 is a base portion 1 which is a portion attached to a sleeper (not shown).
1, a head portion 13 that is a portion with which a train wheel (not shown) comes into contact, and a column portion 12 that is formed narrower than the base portion 11 and 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.

Reference numeral 15 in the drawing is a bolt insertion hole formed in the rail 10, and reference numeral 16 is a through hole 7 of the joint plate 1.
a (7b) and a bolt inserted in the bolt insertion hole 15 of the rail 10, 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 by the mat layer 1a and the roving layer 1b, and the mat layer 1a is laminated perpendicularly to the compressive force applied to the surface of the joint plate 1.

That is, as shown in FIGS. 1 and 2, the mat layer 1a is an upper inclined surface that abuts against the compressive force (indicated by the arrow m) by tightening the bolt 16 and the lower surface of the head 13 of the rail 10. The layers are vertically laminated with respect to the compressive force applied to No. 3 (that is, the compressive load received from the rail 10 when passing the train: indicated by the arrow n).

That is, since the mat layer 1a is laminated perpendicularly to the compressive forces m and n, no shearing force acts between the mat layer 1a and the roving layer 1b. Will have sufficient strength.

Further, in the joint plate 1 of the present invention, the upper end portion 1c of the mat layer 1a laminated perpendicularly to the compressive force n applied to the upper inclined surface 3 is attached to the lower surface of the head portion 13 of the rail 10 (that is, The lower end portion 1d of the mat layer 1a, which extends through the upper inclined surface 3) of the seam plate 1 to the outer surface 8 side and is laminated perpendicularly to the tensile stress applied to the lower inclined surface 4,
Is extended to the outer surface 8 side through the upper surface of the base portion 11 of the rail 10 (that is, the lower inclined surface 4 of the joint plate 1).

That is, both end portions 1 of the mat 1a laminated on the joint plate 1 in the longitudinal direction (direction along the rail) are laminated.
c and 1d are extended from the surface connecting the rear end 3a of the upper inclined surface 3 and the rear end 4a of the lower inclined surface 4 to the outer surface 8 side.

As a result, a portion having a large stress (the rear end 3a of the upper inclined surface 3 and the rear end 4a of the lower inclined surface 4).
Since the end portion 1c of the mat layer 1a is not located at, the stress concentration is small, and the structure has excellent static strength and fatigue strength.

As the thermosetting resin used as the material for the seam plate 1, unsaturated polyester resin, epoxy resin, vinyl ester resin, phenol resin, etc. are preferably used, but fatigue resistance, elongation and heat resistance. In consideration of the above, vinyl ester resin having excellent moldability is most preferable.

As the reinforcing fiber used as the material for the joint plate 1, only carbon fiber is used for the surface portion. Further, glass fiber, carbon fiber, aramid fiber, acrylic fiber, vinylon fiber and the like are preferably used for the central portion, and these are used alone or in any combination.
As the form of the mat layer, roving, chopped strand mat, continuous mat, roving cloth, etc. are used, and these may be used alone or in any combination. Further, as a form of the roving layer, a glass roving in which a predetermined number of glass struts are uniformly aligned and wound in a cylindrical shape is preferably used.

As a method of 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.

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

The joint plate 1 made of fiber reinforced thermosetting resin is
Since it is lightweight, it can be carried with one hand, and one operator can carry and set one set. Further, when used as an insulating joint plate, the surface is covered with a glass fiber reinforced thermosetting resin which is an insulator, so that the insulating performance is high and high insulating reliability can be expected.

[0038]

EXAMPLE Next, an example of the joint plate 1 having the above 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.

As the molding method, the following reinforcing fibers are dipped 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. While heating, the mold is pulled out in the longitudinal direction of the mold to be hardened, and then cut into a regular size. The bolt insertion hole is opened at a specified position with a hold cutter after cutting the standard length.

The mat layer 1 in the joint plate 1 of this embodiment
The laminated form of a is 4 with respect to the compressive force n applied to the upper inclined surface 3 and the tensile stress applied to the lower inclined surface 4, respectively.
9 layers are formed with respect to the compression force m by tightening the layers and the bolts 16.

Further, both end portions 1c and 1d of the mat layer 1a are
Extends from the surface connecting the rear end 3a of the upper inclined surface 3 and the rear end 4a of the lower inclined surface 4 to the outer surface 8 side.

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.). Thermosetting resin: Vinyl ester resin. Hardener: Organic peroxide (t-butyl peroxybenzoate).

The fatigue strength of the joint plate 1 produced in this example and the conventional joint plate were compared. The comparison result is shown in a list in FIG.

Further, the joint plate 1 produced in this embodiment and the conventional joint plate (that is, both end portions 1c of the mat layer 1a,
1d is the rear end 3a of the upper inclined surface 3 and the lower inclined surface 4
The static bending load and the number of times of fatigue until fracture in the bending fatigue test were compared with a seam plate extending only up to near the rear end 4a. The comparison result is shown as a list in FIG.

From the table shown in FIG. 5, the joint plate 1 of this embodiment is shown.
It can be seen that the fatigue resistance property of is significantly improved compared to the conventional joint plate.

Further, from the table shown in FIG. 6, it can be seen that the static bending load and the fracture fatigue frequency of the joint plate 1 of this embodiment are both improved as compared with the conventional joint plate.

[0049]

The seam plate for rails of the present invention is formed by the mat layer and the roving layer, and the mat layer is laminated perpendicularly to the compressive force applied to the surface of the seam plate. Since no shearing force acts between the roving layer and the roving layer, sufficient strength can be obtained against these compressive forces.

Further, in the rail joint plate of the present invention, the end portions of the mat layers laminated perpendicularly to the compressive force applied to the contact surface with the rail are extended to the outside of the contact surface with the rail. Therefore, the static strength and the fatigue strength are improved because the end of the mat layer is not located at the portion where the stress is large.

[Brief description of the drawings]

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

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

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

FIG. 4 is a vertical cross-sectional view showing a state in which a joint plate is attached to a rail.

FIG. 5 is a table showing a comparison result of fatigue strengths of a rail joint plate of the present invention and a conventional rail joint plate.

FIG. 6 is a table showing the results of comparison between the static joint load of the rail joint plate of the present invention and the conventional joint plate for rails, and the fatigue count up to fracture in the bending fatigue test.

FIG. 7 is a vertical cross-sectional view showing a state in which a conventional joint plate is attached to a rail.

FIG. 8 is a cross-sectional view of a conventional seam plate.

[Explanation of reference numerals] 1 seam plate 1a mat layer 1b roving layer 3 upper inclined surface 4 lower inclined surface 8 outer surface 10 rail 16 bolt

Claims (3)

[Claims] 1. A rail joint plate made of a fiber-reinforced thermosetting resin, which is disposed so as to straddle end side surfaces of adjacent rails and is fastened and fixed to the rails by bolts. The rail joint plate is formed by a mat layer and a roving layer, and the mat layer is laminated perpendicularly to a compressive force applied to the surface of the joint plate. 2. The mat layer is laminated perpendicularly to the compressive force due to tightening of the bolt and the compressive force applied to the contact surface with the rail.
The seam plate for the rails described. 3. An end portion of a mat layer laminated perpendicularly to a compressive force applied to a contact surface with the rail is extended to an outside of a contact surface with the rail. The seam plate for rails according to claim 1.