JPH0645441Y2 - Synthetic sleepers - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a synthetic sleeper.

[Prior Art] For example, a conventional wooden sleeper for a bridge is attached to a bridge girder as a ground side support body by a mounting bolt (hook bolt) fitted to the sleeper main body, and a rail fastening portion provided on the surface of the sleeper main body ( It is used by fastening rails with dog nails etc.

The rail serves as a medium for transmitting a signal current for not only forming a vehicle traveling path but also managing the operation of the vehicle.

[Problems to be solved by the invention] However, wooden sleepers are corroded and damaged due to aged deterioration due to long-term use, which causes cracks and decays. Therefore, if water accumulates in the cracked part or the decayed part becomes wet during rainfall or snowmelt, the signal current sent in the rail will cause the signal current sent from inside the rail to reach the rail fastening part, dog nail, cracked part or decayed part. It may be transmitted to the bridge girder through the water and mounting bolts, resulting in a short circuit accident of the signal current, which may impair the proper operation management of the vehicle by the signal.

As a method of preventing the above-mentioned short circuit of the signal current, it is conceivable to adopt a synthetic sleeper as described in Japanese Utility Model Publication No. 61-23042, which is more durable than a wooden sleeper. According to this synthetic sleeper, there is no corrosion or damage due to aging,
There is no risk that water will accumulate in the cracks and decays and that this will form a short circuit path for the signal current.

However, according to the study by the present inventor, iron powder or the like generated due to wear of rails or wheels may adhere to and accumulate on the surface of the synthetic sleepers depending on the place where the synthetic sleepers are laid.
As a result, the adhered and accumulated portion of the iron powder or the like constitutes a short circuit path of the signal current at the time of rainfall or snow melting, and as a result, a short circuit accident may occur.

An object of the present invention is to reliably prevent the occurrence of a short circuit accident in which a signal current in the rail leaks to the ground side support side by using a synthetic sleeper.

[Means for Solving the Problems] The present invention according to claim 1, wherein the sleeper main body is formed of a columnar body of a hard resin foam reinforced with long fibers embedded in the longitudinal direction, and the sleeper main body is formed. For a composite sleeper that is attached to the ground side support body with the mounting bolts fitted to the rail and is used by fastening the rail to the rail fastening part provided on the surface of the sleeper body, the rail fastening part and the mounting bolt fitting on the surface of the sleeper body A signal current interrupting member that interrupts the leakage of the signal current transmitted through the rail to the mounting bolt side is provided between the member and the section.

The present invention according to claim 2, wherein the signal current interruption member is
It is a coating film of an electrically insulating coating material having a friction coefficient smaller than that of the surface of the sleeper body, which is applied between at least the rail fastening portion and the mounting bolt fitting portion on the surface of the sleeper body. .

The present invention according to claim 3, wherein the signal current interruption member is
The obstacle is made of an electrically insulating material and is provided in a convex shape so as to divide the rail fastening portion and the mounting bolt fitting portion on the surface of the sleeper body from each other.

The present invention according to claim 4, wherein the signal current interruption member is
The mounting bolt is an electrically insulating washer provided on the surface of the sleeper body.

[Operation] According to the present invention described in claim 1, the following operation effects are obtained.

Since the synthetic sleepers are made of hard resin foam reinforced with long fibers, there is no corrosion or damage, and there are no cracks or decays that could cause the formation of the aforementioned signal current short-circuit paths within the sleepers. .

Further, even if iron powder or the like generated due to wear of rails or wheels falls on the surface of the synthetic sleeper, a signal current interruption member is provided between the rail fastening portion and the mounting bolt fitting portion on the surface. . Therefore, even when it is raining or snow-melting, the signal current blocking member can block the above-mentioned signal current from leaking to the side of the mounting bolt through the adhesion or deposit of iron powder or the like on the surface of the sleeper.

That is, by the above, the establishment of a short circuit path through which the signal current in the rail leaks to the ground side support body can be prevented both inside and on the surface of the sleeper body, and the occurrence of a short circuit accident can be reliably prevented.

According to the present invention as set forth in claim 2, since the signal / current blocking member is made of, for example, a fluororesin-based paint, an electric insulating coating film having a friction coefficient smaller than the friction coefficient of the surface of the sleeper body is used. It is easy to remove the iron powder and the like that have fallen on the surface of the car by blowing it off with the traveling wind of the vehicle, and as a result, it is possible to reliably prevent the formation of a short circuit path on the surface of the sleeper.

According to the present invention as set forth in claim 3, since the signal current interrupting member is a convex electrical insulating obstacle that divides the rail fastening portion and the mounting bolt fitting portion, the surface of the sleeper main body It is possible to prevent the iron powder or the like that has dropped onto the side of the mounting bolt from reaching and adhering and accumulating, and as a result, it is possible to reliably prevent the formation of a short circuit path on the surface of the sleeper.

According to the present invention as set forth in claim 4, since the signal current interrupting member is an electrically insulating washer for the mounting bolt, iron powder or the like that has fallen onto the surface of the sleeper body adheres to the surface, Even if they are deposited, the electrically insulating washer adheres to the iron powder and isolates the mounting bolt from the deposition surface. As a result, the establishment of the short circuit path on the surface of the sleeper can be reliably prevented.

[Embodiment] FIG. 1 is a schematic view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing an essential part of FIG. 1, and FIG. 3 is an essential part of a second embodiment of the present invention. FIG. 4 is a perspective view showing the essential parts of a third embodiment of the present invention.

In FIG. 1, 10 is a synthetic sleeper, and this synthetic sleeper 10
Is attached to the bridge girder 13 as the ground side support by hook bolts 12 (mounting bolts) fitted to the sleeper main body 11,
A rail 16 is fastened to a tie plate 14 (rail fastening portion) provided on the surface of the sleeper body 11 with dog nails 15 for use. Where 12 hook bolts, 13 bridge girders, 1 tie plate
4, the dog nail 15 and the rail 16 are each made of an iron-based material or the like that is a good electric conductor.

The rail 16 functions as a transmission medium of a signal current for forming a traveling path of a vehicle and managing the driving of the vehicle.

Further, the synthetic sleeper 10 is a columnar body composed of a thermosetting (or thermoplastic) resin foam body 21 and a reinforcing long fiber 22, and the long fiber 22 is arranged in the longitudinal direction in the foam body 21. It is in a dispersed and buried state. At this time, the synthetic sleeper 10 has a density of 0.6 to 1.0 g / cm ³ and a reinforcing fiber 22 content of 40 to 60, as described in Japanese Utility Model Publication No. 61-23042.
It is suitable if it is within the range of weight%. In addition, the type of resin forming the foam 21 may be either thermosetting or thermoplastic. For example, in the case of thermosetting resin,
There is no particular limitation as long as it is thermosetting to give a hard resin foam, and urethane resin, epoxy resin, vinyl ester resin, unsaturated polyester resin and the like can be used. Particularly, a urethane resin and an unsaturated polyester resin having foamability are preferable. Further, as the thermoplastic resin, polyvinyl chloride resin, polypropylene resin, polyethylene resin, polystyrene resin, polycarbonate resin or the like can be used.

Further, as the long fibers 22, it is possible to use any inorganic long fibers such as glass fibers, carbon fibers, and inorganic materials such as metal fibers, aromatic polyamide fibers, polyimide fibers, and polyether / ether / ketone fibers. From the viewpoint of strength and economy, glass fiber is preferable. In addition to long fibers, short fibers may be used in combination, and fillers such as calcium carbonate, gypsum and clay may be added.

Thus, in the synthetic sleeper 10, as shown in FIG. 2, the tie plate 14 and the hook bolt on the surface of the sleeper main body 11 are provided.
A coating film 30 (signal current interruption member) of an electric insulating paint having a friction coefficient smaller than the friction coefficient of the surface of the sleeper body 11 is applied between the 12 fitting portions. As a constituent paint of the coating film 30, for example, a fluororesin-based paint is suitable.

Next, the operation of the above embodiment will be described.

According to the above embodiment, there are the following operational effects.

Since the synthetic sleeper 10 is made of the thermosetting (or thermoplastic) resin foam 21 reinforced with the long fibers 22, there is no corrosion or damage, and it becomes a factor for forming the above-mentioned short circuit path of the signal current in the sleeper. It does not cause cracks or decay.

Further, even if iron powder or the like generated by wear of the rails 16 and wheels falls on the surface of the composite sleeper 10, a signal current interruption member is formed between the tie plate 14 and the hook bolt 12 fitting portion of the surface. A coating film 30 is provided. Therefore, even when it rains or melts snow, the above-described signal current passes through the hook bolt after the iron powder adheres to the surface of the sleeper and accumulates.
Leakage to the 12 side can be blocked by this coating film 30.

That is, due to the above, the signal current in the rail is
It is possible to reliably prevent the occurrence of a short-circuit accident by preventing the formation of a short-circuit path that leaks to the inside of the sleeper body 11 both inside and on the surface.

Here, in the above embodiment, since the signal current blocking member is constituted by the electric insulating coating film 30 whose coefficient of friction is smaller than the coefficient of friction of the surface of the sleeper main body 11, the iron powder or the like dropped on the surface of the sleeper main body 11 is used for the vehicle. It can be easily removed by being blown away by running wind or the like, and as a result, the formation of a short circuit path on the surface of the sleeper can be reliably prevented.

The second embodiment shown in FIG. 3 is different from the first embodiment in that the obstacle 40 made of an electrically insulating material such as synthetic resin is used as the signal current blocking member of the present invention. Obstacle 40
Is placed between the tie plate 14 and the hook bolt 12 fitting portion on the surface of the sleeper body 11 so as to divide them, and is installed in a convex shape.

That is, according to the second embodiment, the signal current interrupting member is composed of the above-described electrical insulation obstacle 40, so that the sleeper main body 11
It is possible to prevent the iron powder or the like that has fallen on the surface of the above from reaching the hook bolt 12 side and adhering and accumulating, and as a result, it is possible to reliably prevent the formation of a short circuit path on the surface of the sleeper.

The third embodiment shown in FIG. 4 is different from the first embodiment in that an electrically insulating washer 50 is used as a signal current interruption member of the present invention.
I used to. The washer 50 is provided on the surface of the sleeper body 11 for the hook bolt 12 between the tie plate 14 and the hook bolt 12 fitting portion on the surface of the sleeper body 11, and is made of an electrically insulating material such as synthetic resin. It is formed or covered with the insulating material such as synthetic resin.

That is, according to the third embodiment, since the signal current interruption member is the electrically insulating washer 50 for the hook bolt 12, the iron powder or the like that has fallen onto the surface of the sleeper main body 11 is on the surface. Electrically insulating washer 50, even if attached or deposited
Isolates the hook bolt 12 from the adhered and deposited surface of the iron powder and the like. As a result, the establishment of the short circuit path on the surface of the sleeper can be reliably prevented.

The synthetic sleepers of the present invention are not limited to bridge sleepers, but can be applied to normal sleepers, branch sleepers, short sleepers used in tunnels, and the like.

[Effect of the Invention] As described above, according to the present invention, it is possible to reliably prevent the occurrence of a short circuit accident in which the signal current in the rail leaks to the ground side support body side by using the synthetic sleepers.

[Brief description of drawings]

FIG. 1 is a schematic view showing a first embodiment of the present invention, FIG. 2 is a perspective view showing an essential part of FIG. 1, and FIG. 3 is a perspective view showing an essential part of a second embodiment of the present invention. FIG. 4 is a perspective view showing an essential part of a third embodiment of the present invention. 10 …… Synthetic sleeper, 11 …… Sleep body, 12 …… Hook bolt (mounting bolt), 13 …… Bridge girder (ground side support), 14 …… Type plate (rail fastening part), 21 …… Foam, 22 ... Long fiber, 30 ... Coating film (signal current blocking member), 40 ... Obstacle (signal current blocking member), 50 ... Washer (signal current blocking member).

Claims (4)

[Scope of utility model registration request] 1. A sleeper main body is formed of a columnar body of a hard resin foam reinforced by long fibers embedded in a longitudinal direction,
In a composite sleeper that is attached to the ground side support body by a mounting bolt fitted to the sleeper body and is used by fastening a rail to a rail fastening portion provided on the surface of the sleeper body, a rail fastening portion and a mounting bolt on the surface of the sleeper body A composite sleeper, characterized in that a signal current blocking member for blocking the leakage of the signal current transmitted through the rail to the mounting bolt side is provided between the fitting sleeper and the fitting portion. 2. The electrical insulation in which the signal current interruption member is applied at least between the rail fastening portion and the mounting bolt fitting portion on the surface of the sleeper body, and the friction coefficient is smaller than the friction coefficient of the surface of the sleeper body. The synthetic sleeper according to claim 1, which is a coating film of paint. 3. The signal current interruption member is an obstacle made of an electrically insulating material, which is installed in a convex shape so as to divide the rail fastening portion and the mounting bolt fitting portion on the surface of the sleeper body from each other. The synthetic sleeper according to claim 1. 4. The composite sleeper according to claim 1, wherein the signal current interruption member is an electrically insulating washer provided on the surface of the sleeper body for the mounting bolt.