JPH041802B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to vibration-proof sleepers used on railway tracks.

(Prior art) Conventionally, as this type of anti-vibration sleeper, for example,
- As shown in Publication No. 14161, an elastomer sheath is installed between the bottom surface of the concrete sleeper inserted into the recess arranged in the track bed, the end surface in the longitudinal direction of the rail, the side surface in the right angle direction of the rail, and the recess in the track. Sleepers have been proposed that are provided with vibration-proof properties through interposition.

(Problems to be Solved by the Invention) In the conventional anti-vibration sleepers described above, when attempting to increase the anti-vibration effect by increasing the vertical deformation of the elastomer, the deformation in the horizontal direction, particularly in the direction perpendicular to the rail, becomes excessive. There are drawbacks that can cause problems over time.

In order to eliminate these drawbacks, it has been proposed to make the elastomer on the bottom of the sleeper highly elastic and the elastomer on the side and end surfaces to have low elasticity.
When the elastomer on the side and end surfaces of the sleeper deforms as the sleeper surface comes into close contact with the circumferential surface of the track bed recess, vertical deformation is inhibited by the shear resistance of the elastomer, so the elastomer slides on the circumferential surface of the track bed recess, causing the sleeper to deform. The elastomer on the side and end faces wears out and has the disadvantage of being easily ejected.

(Means for Solving the Problems) The present invention has been proposed in order to eliminate such drawbacks, and is aimed at recesses provided across both end surfaces in the longitudinal direction of the rail and the side surfaces in the perpendicular direction of the rail of concrete sleepers. An elastomer is fitted into the groove so that a part of the elastomer protrudes from the surface of the sleeper, and a case is fitted over both ends, sides, and bottom of the sleeper so as to cover the protruding portion of the elastomer. This invention relates to a vibration-proof sleeper characterized by:

(Function) As described above, in the present invention, an elastomer is fitted into grooves provided across both end faces in the longitudinal direction of the concrete sleeper rail and the side faces in the perpendicular direction to the rail so that a part of the elastomer protrudes from the surface of the sleeper. , a case is fitted to both end faces, side surfaces, and the bottom of the sleeper so as to cover the protrusion of the elastomer to form a vibration-proof sleeper, and the sleeper is inserted into a mounting recess provided in the track. The case is anchored in the concave portion, and the elastomer fitted in the sleeper so as to partially protrude into the concave groove undergoes shearing deformation in the vertical direction and compressive deformation in the horizontal direction. .

Generally speaking, the displacement of an elastomer in response to a force in the shear direction is several times as large as the deformation in response to a force in the compressive direction of the same magnitude.
It also exhibits low elasticity in the horizontal direction.

(Example) The present invention will be described below with reference to the illustrated embodiments.

Reference numeral 1 denotes a concrete sleeper, and grooves 2 are provided across both end surfaces in the longitudinal direction of the rail and the side surfaces in the direction perpendicular to the rail, and an elastomer 3 is fitted into the groove 2 so as to partially protrude from the surface of the sleeper. There is.

The elastomer 3 is constructed by integrally layering a base 3b such as a steel plate on both end surfaces of a rubber 3a.

A case 4 is made of metal or synthetic resin, and a concave groove 5 is provided at a position corresponding to the concave groove 2 of the sleeper 1.

Then, a case 4 is fitted from the lower part of the sleeper 1 so as to cover the bottom surface, the end surface in the longitudinal direction of the rail, and the side surface in the direction perpendicular to the rail, and the elastomer 3 protrudes from the sleeper surface into the concave groove 5 of the case 4. The anti-vibration sleeper A is constructed by fitting the parts together.

Then, the anti-vibration sleeper A is inserted into the recess of the track B, and the case 4 is anchored to the track B. C in the figure is a rail.

At this time, since the case 4 is isolated by the elastomer 3, if the elastomer 3 is an electrically insulating material, it will be electrically insulated.

Since the illustrated embodiment is constructed as described above, the elastomer 3 fitted into the grooves 2 of the concrete sleeper 1 so as to partially protrude from the sleeper surface will not undergo shear deformation in the vertical direction. Compressive deformation occurs in the horizontal direction.

Generally, the deformation of the elastomer 3 in response to a force in the shear direction is several times greater than the deformation in response to a force in the compressive direction of the same magnitude, so it has high elasticity in the vertical direction.
Furthermore, it can have low elasticity in the horizontal direction.

Note that when pure shear deformation occurs, as shown in FIG. 8, a tensile force acts between the synthetic rubber 3a and the base 3b in the elastomer 3, resulting in poor durability. The elastomer 3 is fitted into the concave groove 2 of the sleeper 1 so that 3b is not vertical but at an angle with the vertical line, so that when the sleeper is vertically displaced, the elastomer 3 undergoes compression deformation at the same time as shear deformation. This improves durability.

Note that by selecting the angle between the elastomer base 3b and the vertical line, vertical elasticity and horizontal elasticity can be determined more appropriately.

(Effects of the Invention) As described above, in the anti-vibration sleeper according to the present invention, the concave grooves provided across both longitudinal end surfaces of the concrete sleeper and the side surfaces in the right angle direction of the rail,
The elastomer was fitted so that a part of it protruded from the surface of the sleeper, and cases were fitted to both end faces, sides, and bottom of the sleeper so as to cover the protruding part of the elastomer, so that the elastomer was vertically Shearing deformation occurs in the direction and compressive deformation occurs in the horizontal direction, resulting in high elasticity in the vertical direction and low elasticity in the horizontal direction, as mentioned above.
Furthermore, since the elastomer is fitted into the grooves of the sleeper, it is prevented from coming out from the side and end surfaces of the sleeper.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing how the anti-vibration sleeper according to the present invention is used, Fig. 2 is a side view thereof, Fig. 3 is a plan view thereof, Fig. 4 is a partial perspective view of the concrete sleeper, and Fig. 5 is a partial perspective view showing the state in which the elastomer is fitted to the sleeper, Fig. 6 is a longitudinal sectional view showing the state in which the case is further fitted, Fig. 7 is a slope view of the case, and Figs. 8 and 9 are FIG. 3 is an explanatory diagram of the effect when pure shear deformation occurs in the elastomer of the sleeper of the present invention. 1... Concrete sleepers, 2... Concave grooves, 3...
...Elastomer, 4...Case, 5...Concave groove.

Claims (1)

[Scope of Claims] 1. Concave grooves provided across both end surfaces in the longitudinal direction of the rail of concrete sleepers and side surfaces in the direction perpendicular to the rail,
An elastomer is fitted so that a part of the elastomer protrudes from the surface of the sleeper, and a case is fitted over both ends, sides, and bottom of the sleeper so as to cover the protruding portion of the elastomer. Anti-vibration sleepers featuring: 2. The anti-vibration sleeper according to claim 1, wherein the elastomer is fitted into the groove in the concrete sleeper such that the upper and lower surfaces thereof are oblique to a vertical line.