JP3103303B2 - 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 made of a fiber-reinforced thermosetting resin and disposed between end side surfaces of adjacent rails, and more particularly, to an improvement in strength. The present invention relates to a rail joint plate as intended.

[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 solve such poor workability, there is provided a seam plate in which the entire seam plate is formed of a fiber-reinforced thermosetting resin having a mat layer and a roving layer as reinforcing fibers (see, for example, Japanese Patent Application Laid-Open No. H11-157556). For example, JP-A-50-473
No. 01, JP-A-7-145601).

The reason why the mat layer and the roving layer are used as the reinforcing fibers is as follows. That is, if the reinforcing fibers are only the mat layer, the density of the fibers becomes low, the ratio of the thermosetting resin increases, and the strength is reduced. This is because the fibers are strong against the tensile force but weak against the force from the vertical direction of the fibers, so that the fibers are separated.

According to such a seam plate made of resin, lightness and good workability can be ensured, and insulation can be ensured without any intervening insulating members such as the insulating plate 53 and the insulating tube 54.

[0010]

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

As one of the causes of the shear fracture occurring between the mat layer and the roving layer, it is conceivable that stress is concentrated at the end of the mat layer.

That is, in the conventional seam plate 52, FIG.
As shown in the figure, both ends 52c, 52d of the mat layer 52a
Are the rear end 56a of the upper inclined surface 56 and the lower inclined surface 5
7, the stress is concentrated only on both ends 52c and 52d of the mat layer 52a.

The present invention has been made to solve the above problems, and has as its object to prevent the occurrence of shear fracture occurring between the mat layer and the roving layer and to occur at the end of the mat layer. An object of the present invention is 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 the present invention is provided so as to straddle between end side surfaces of adjacent rails, and is fixed to the rails by bolts. Table a joint plate rails manufactured by the fiber reinforced thermosetting resin, the rail for seam plate Rutotomoni formed by the matte layer and the roving layer, said mat layer is joint plate that
The rails are vertically stacked with respect to the compressive force applied to the
Machining perpendicular to the compressive force applied to the contact surface
The end of the cut layer extends outside the contact surface with the rail.
It has been extended. In other words, the mat layer
Layered vertically to the mat layer and roving layer
Since no shearing force acts between the layers,
And have sufficient strength,
Since the end of the mat layer is not located in
The structure is small and has excellent static strength and fatigue strength.

[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, faces the rail 10 to be described later faces 2
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.

[0018] The surface of the facing surface 2 and the opposite side (outer surface) 8
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.

[0020] That is, the rail 10, as shown in FIG. 4, the base portion 1 is a portion attached to the sleepers (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.

[0022] That is, the seam plate 1 has a structure in 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
Is formed by a mat layer 1a and a roving layer 1b, and is formed by laminating the mat layers 1a perpendicularly to a compressive force applied to the surface of the seam plate 1.

[0026] That is, as shown in FIGS. 1 and 2, a mat layer 1a, the compressive force by tightening the bolts 16 (shown by arrow m) and the upper inclined surface in contact with the lower surface of the head 13 of the rail 10 3 are vertically stacked with respect to the compressive force applied to the rails 3 (that is, the compressive load received from the rail 10 when passing through the train: indicated by an arrow n).

[0027] That is, compressive forces m the mat layer 1a, since the laminated perpendicular to n, since the shearing force between the layers of the mat layer 1a and the roving layer 1b does not work, these compression forces m, n to And have sufficient strength.

In addition, the seam plate 1 of the present invention is configured such that the upper end 1c of the mat layer 1a vertically laminated with respect to the compressive force n applied to the upper inclined surface 3 is attached to the lower surface of the head 13 of the rail 10 (ie, The lower end portion 1d of the mat layer 1a which extends to the outer surface 8 side via the upper inclined surface 3) of the seam plate 1 and which is vertically laminated with respect 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 11 of the rail 10 (that is, the lower inclined surface 4 of the seam plate 1).

[0029] That is, both end portions of the mat 1a is a plurality of layers stacked (direction along the rail) longitudinally seam plate 1 1
c, 1d extend 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.

[0030] Thus, a large part of the stress (the side end portion 4a after the side end portion 3a and the lower inclined surface 4 after the upper inclined surface 3)
Since the end portion 1c of the mat layer 1a is not located at the same time, the stress concentration is small, and the structure has excellent static strength and fatigue strength.

As the thermosetting resin used as the material of the 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 surface 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 a form of the mat layer, roving, chopped strand mat, continuous mat, roving cloth, and the like 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 stradds are uniformly arranged and rolled into a cylindrical shape is preferably used.

As a method of manufacturing the seam plate 1 having the above-described 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 joint plate 1 made of fiber-reinforced thermosetting resin,
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.

[0036]

Next, an embodiment of the seam plate 1 having the above-described structure will be described.

The joint plate 1 of this embodiment, 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 mat layer 1 at the joint plate 1 of this embodiment
The lamination form of “a” is such that the compressive force n applied to the upper inclined surface 3 and the tensile stress applied to the lower inclined surface 4 are each 4
Nine layers are formed with respect to the compression force m due to the tightening of the layer and the bolt 16.

Further , both ends 1c, 1d of the mat layer 1a
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.

[0041] The details of the raw materials that were used at this time is as follows.

The reinforcing fiber: glass roving (Asahi Fiber Co., Ltd. ♯4450), Continuous strand mat (Asahi Fiber Co., Ltd. ♯450), glass cloth (manufactured by Nippon Sheet Glass Co., Ltd. ♯580). Thermosetting resin: vinyl ester resin. Curing agent: organic peroxide (t-butylperoxybenzoate).

[0043] The joint plate 1 manufactured in this example a comparison of the fatigue strength of the conventional joint plates was performed. FIG. 5 shows a list of the comparison results.

Further, the seam plate 1 manufactured in this embodiment and the conventional seam plate (that is, both ends 1c,
1 d is a rear end 3 a of the upper inclined surface 3 and a lower inclined surface 4
(A seam plate extending only up to the vicinity of the rear end 4a) and a comparison of the number of fatigue cycles to failure in a bending fatigue test. FIG. 6 shows the comparison result as a list.

From the table shown in FIG . 5, the seam plate 1 of this embodiment is shown.
It can be seen that the fatigue resistance characteristics of the steel sheet are significantly improved as compared with the conventional seam plate.

From the table shown in FIG. 6, it can be seen that the static bending load and the number of times of fracture fatigue of the seam plate 1 of this embodiment are both improved as compared with the conventional seam plate.

[0047]

The rail joint plate of the present invention is formed by a mat layer and a roving layer, and the mat layer is laminated perpendicularly to the compressive force applied to the surface of the joint 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 ends of the mat layers laminated vertically to the compressive force applied to the contact surface with the rail extend to the outside of the contact surface with the rail. Therefore, since the end of the mat layer is not located at a portion where the stress is large, both the static strength and the fatigue strength are improved.

[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 table showing a comparison result of fatigue strength between the rail joint plate of the present invention and a conventional rail joint plate.

FIG. 6 is a table showing comparison results of the static bending load and the number of times of fatigue until failure in a bending fatigue test between the rail joint plate of the present invention and the conventional rail joint plate.

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

FIG. 8 is a sectional view of a conventional joint plate.

[Explanation of symbols]

 Reference Signs List 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 (1)

(57) [Claims] 1. A rail joint plate made of a fiber-reinforced thermosetting resin which is disposed between end side surfaces of adjacent rails and is fastened and fixed to said rails with bolts. The rail joint plate is
The mat layer is formed by a mat layer and a roving layer, and the mat layer is laminated vertically to a compressive force applied to the surface of the seam plate, and is applied to a contact surface with the rail.
The end of the mat layer stacked perpendicular to the compression force
A rail joint plate extending to an outside of a contact surface with the rail.