JPH08253902A - Rail elastic fastening device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the durability with little rail displacement. [Structure] An elastic member 5 is interposed between an upper tie plate 3 and a base plate 4, and these are integrally vulcanized together with an intermediate member 13. On the lower surface of the flat portion 3a of the upper tie plate 3, there is provided a fitting convex portion 3c projecting downward at the center of the rail length at a position offset by 10 to 30 mm inward from the center in the rail width direction. On the base plate 4,
The fitting concave portion 4a is formed so as to correspond to the fitting convex portion 3c. The intermediate member 13 is externally fitted to the fitting convex portion 3c of the upper tie plate 3, and the fitting concave portion 4a of the base plate 4 is externally fitted to the outer side thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rail elastic fastening device for elastically fastening a rail of a railway vehicle to a support such as a slab or sleeper.

[0002]

2. Description of the Related Art In recent years, a rail fastening device has been desired to have a lower spring constant in the vertical direction in order to prevent vibration noise of houses, buildings, etc. constructed near the railroad track. That is, the vertical spring constant of the rail fastening device is usually 50 ton / cm or more, but there is a demand for a low spring constant of 5 to 30 ton / cm.

By the way, if the spring constant in the vertical direction is lowered in the rubber alone, the spring constant in the lateral direction (direction in which the lateral pressure acts) is also lowered, and in that case, measures against the lateral pressure are required.

Therefore, a rail fastening device has been proposed in which the spring constant is lowered in the vertical direction by utilizing the shear deformation of the rubber elastic member in the vertical direction and the compressive deformation of the rubber elastic member in the horizontal direction. Has been done. Specifically, as shown in FIGS. 4 and 5, a tie plate a having a trapezoidal cross section of an inverted trapezoid shape.
Is elastically connected to the tapered inner side surface d ₁ of the cylindrical portion d of the base plate c having a shape corresponding to the outer peripheral surface a ₁ of the tie plate a via a rubber elastic member b. In addition, e
Is a rail, f is a fastener, and g is a fastening bolt.

However, in such a rail fastening device, when lateral pressure F acts laterally on the rail, the arrow B
There is a deviation in the direction, the position of the rail e cannot be secured, and there is a problem in position accuracy. Further, since shear deformation is used, there is a problem in terms of life and durability.

Therefore, for example, as described in Japanese Utility Model Laid-Open No. 5-3302, a base plate attached to a support such as a tie plate to which a rail is attached, a slab, a sleeper, and an elastic member interposed between the two plates. A fitting convex portion having a member and protruding downward of the tie plate is formed with a fitting concave portion in which the fitting convex portion is fitted to the base plate, and the fitting convex portion of the tie plate and the base plate are formed. There has been proposed a rail elastic fastening device in which an intermediate member made of synthetic resin is fitted and inserted between the fitting recess and the fitting recess.

[0007]

By the way, in such a device, when lateral pressure acts laterally on the rail from the inner gauge side, a rotational moment that tends to tilt the rail to the outer gauge side due to the lateral pressure is generated. However, since the elastic member is provided to reduce the spring constant in the vertical direction, the inclination of the rail tends to increase, which is also disadvantageous in terms of durability.

[0008] The present invention provides a rail elastic fastening device in which the rail is less displaced and the durability is improved.

[0009]

The invention according to claim 1 is
An upper tie plate to which a rail is attached, a base plate attached to a supporting body such as a slab or sleeper, and an elastic member which is interposed between the both plates and covers side surfaces of the both plates. Fitting protrusions protruding downward are formed on the base plate, and fitting recesses to which the fitting protrusions are fitted are respectively formed, and between the fitting protrusions of the upper tie plate and the fitting recesses of the base plate. A structure in which an intermediate member made of synthetic resin is inserted and the center of the intermediate member, the fitting protrusion, and the fitting recess in the width direction is deviated from the center of the rail in the width direction by a predetermined amount to the inner rail side of the rail. And

In the invention according to claim 2, the predetermined amount is about 10 to 30 mm.

[0011]

Next, the operation of the rail fastening device according to the present invention will be described with reference to FIGS.

When the lateral pressure F acts on the rail 2 from the inside of the gauge, a rotational moment M that tends to incline the rail 2 to the outside of the gauge is generated by the lateral pressure F. The inclination angle θ of the rail 2 due to the rotation moment M is determined by the resistance force (rigidity) of the elastic member 5 against the rotation moment M. That is, the inclination angle θ of the rail 2 due to the rotation moment M is determined by the compressive deformation of the elastic portion 5a outside the gauge of the elastic member 5 and the tensile deformation of the elastic portion 5b inside the gauge. Generally, the elastic modulus of an elastic member typified by rubber is 1.5 in compression deformation than in tensile deformation.
~ 2.0 times larger.

Therefore, according to the first aspect of the invention, the center L2 of the intermediate member 13 in the lateral pressure acting direction is set to the center L1 of the upper tie plate 3 and the base plate 4 in the lateral pressure acting direction (of the rail). Almost corresponding to the center in the width direction),
Since it is displaced by a predetermined amount ΔL inside the track, the intermediate member 13
The elastic member compression deformation portion on the outer side of is larger than the elastic member tension deformation portion on the inner side. As a result, the resistance against lateral pressure increases, and the inclination of the rail (small return angle θ) decreases.

Further, according to the second aspect of the present invention, the center L2 of the intermediate member 13 in the direction in which the lateral pressure acts is closer to the rail 2 than the center L1 of the upper tie plate 3 and the base plate 4 in the direction in which the lateral pressure acts. Since it is shifted about 10 to 30 mm inside the gauge, the resistance to small deflection against lateral pressure F becomes large, and the small return to the inside of the rail 2 of the rail 2 due to the wheel load W (vertical load) of the train, It can be held down slightly. Here, the reason why the distance is shifted by 10 to 30 mm is that when the amount of displacement is smaller than 10 mm, the increase in the resistance to buckling against lateral pressure becomes insufficient, and when it is larger than 30 mm, the wheel load W of the train is increased. This is because there is a tendency that the small inward movement of the rail due to the rail increases.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rail fastening device according to the present invention will be described below in detail with reference to the drawings of the embodiments. As shown in FIGS. 1 and 2, a rail elastic fastening device 1 according to the present invention includes a rail 2, an upper tie plate 3 on which the rail 2 is placed on an upper side, a base plate 4, and an interposition therebetween. A tie plate 6 made of an elastic member 5 for covering the side surfaces of both plates 3 and 4, a fixed portion of a rail 2 made of a fixture 7, bolts 8 and nuts 9, and an embedding embedded in a support 10 such as a concrete slab. It is composed of a tie plate fixing portion including a plug 11, an anchor T bolt 12, and a washer nut (not shown).

The upper tie plate 3 is a rectangular plate-like body (size: width 360 mm, length 180 mm, thickness 22 to 26 mm) made of spheroidal graphite cast iron (FCD800, etc.), and the center upper surface on which the rail 2 is placed. Flat portion 3a of the
A predetermined amount ΔL is inside the gauge from the center line L1 in the rail width direction at the mounting portions 3b that are displaced in the longitudinal direction of the rail 2 on both sides of a and project upward, and the central portion of the lower surface of the flat portion 3a in the rail longitudinal direction. It has a center line L2 at a displaced position and a fitting convex portion 3c protruding downward.

On the other hand, the base plate 4 has a rectangular steel plate (SS400, etc., size: width 360 mm, length 180 m).
m, thickness 9 mm) is perforated and bent to form a fitting concave portion 4a having a diameter larger than that of the fitting convex portion 3c of the upper tie plate 3 and having the center position aligned with each other. Part 2
Through holes (not shown) through which the anchor T bolts 12 pass are formed at various locations.

Between the fitting convex portion 3c of the upper tie plate 3 and the fitting concave portion 4a of the base plate 4, there is an intermediate member 13 made of synthetic resin such as polyamide resin containing glass fiber.
And an elastic member 5 made of a natural rubber compound is provided between the upper tie plate 3 and the base plate 4. The lower surface and outer surface of the upper tie plate 3,
The upper and outer surfaces of the base plate 4 and the intermediate member 13
Since the outer peripheral surface of (1) has been preliminarily adhered, a tie plate 6 in which the respective members 3, 4 and 13 are integrated can be obtained by heating and pressurizing.

In the tie plate 6, the rail 2 is used.
The widthwise center L2 of the intermediate member 13, the fitting projection 3c and the fitting recess 4a is displaced from the center L1 in the widthwise direction of the rail 2 by a predetermined amount ΔL = 10 to 30 mm inside the rail. There is.

Subsequently, the fitting convex portion 3c and the fitting concave portion 4a
Five types of tie plates having different amounts of deviation ΔL of the fitting portion with, that is, the above-mentioned amount of deviation is 15 mm in the invention examples 1 and 2,
25 mm was prepared as Comparative Examples 1, 2, and 3 with the displacement amounts of 0 mm, 7 mm, and 35 mm, respectively, and the five types of tie plates thus obtained were tested as shown in FIG. A performance test was performed using the apparatus, specifically, in FIG. 3, a test jig having an inclined surface 22a inclined by an angle α = 44 ° with respect to the horizontal plane on the lower plate 21 of the Amsler type compression tester. The tool 22 is placed, the tie plate 6 as a sample is attached to the inclined surface 22a of the test jig 22, and the flat portion 3a of the upper tie plate 3 is attached.
The rail 2 is fixedly placed on the head of the rail 2 through the upper plate 23 of the Amsler type compression tester by mounting the rail 2 fixedly using the mounting members such as the fixture 7, the bolt 8 and the nut 9, and the like. The displacement amount of the head of the rail 2 is measured by using a first displacement meter 24 that detects the vertical displacement and a second displacement meter 25 that detects the displacement of the test jig 22 in the inclined surface 22a direction, Based on the measurement results, the rail turning angle and the horizontal displacement of the rail head were obtained. In FIG. 3, 27 and 28 are magnet stands of the displacement gauges 24 and 25.

The results of the above tests are shown in Table 1. In addition, the small turning angle and the horizontal displacement of the rail head are when the load is P = 49 kN. Further, the spring constant (vertical direction) in Table 1 is obtained from the amount of vertical displacement when the tie plate 6 is placed horizontally, the rail 2 is placed, and a vertical load of 0 to 20 kN is applied to the rail head. Is.

[0022]

[Table 1]

From the results shown in Table 1 above, the center of the fitting portion of the upper tie plate 3 and the base plate 4 in the width direction is deviated from the center of the rail in the width direction by a predetermined amount to the inner side of the rail, so that the rail is small against lateral pressure. It can be seen that the return can be improved, and particularly the case where the deviation amount is 10 to 30 mm is good because the small return angle of the rail is small.

[0024]

The invention according to claim 1 has the following features.
An intermediate member made of a synthetic resin is fitted and inserted between the fitting convex portion of the upper tie plate and the fitting concave portion of the base plate, and the center of the intermediate member, the fitting convex portion, and the fitting concave portion in the width direction is fixed to the rail. Since the rail is offset by a certain amount from the center in the width direction to the inside of the rail gauge, the spring constant in the vertical direction (vertical direction) can be reduced, and the rail has a small turning angle, which improves durability. Is possible.

According to the second aspect of the present invention, the deviation amount of the center of the intermediate member, the fitting convex portion, and the fitting concave portion in the width direction from the center of the rail in the width direction to the inside of the rail is 10 to 30 mm. Therefore, in particular, the small turning angle of the rail is small, which is favorable.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a rail elastic fastening device.

FIG. 2 is an explanatory diagram of the operation.

FIG. 3 is an explanatory diagram of a test device.

FIG. 4 is a sectional view of a conventional example.

FIG. 5 is a plan view of the same.

[Explanation of symbols]

 1 rail elastic fastening device 2 rail 3 upper tie plate 3c upper tie plate fitting protrusion 4 base plate 4a base plate fitting recess 5 elastic member 13 intermediate member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriharu Nagato 2-8, Hikarimachi, Kokubunji, Tokyo 38 Inside the Railway Technical Research Institute (72) Inori, Noritsugu Abe 2-8, Hikarimachi, Kokubunji, Tokyo Address 38 Inside the Railway Technical Research Institute (72) Inventor Hiroshi Kumazaki 2-8 Mitsumachi, Kokubunji, Tokyo 38 Inside the Railway Technical Research Institute

Claims (2)

[Claims] 1. An upper tie plate to which a rail is attached, a base plate attached to a support such as a slab, sleeper, and the like, and an elastic member interposed between the both plates and covering side surfaces of the both plates, The upper tie plate is formed with a fitting protrusion protruding downward and the base plate is formed with a fitting recess in which the fitting protrusion is fitted, and the fitting protrusion of the upper tie plate and the base plate are fitted together. An intermediate member made of synthetic resin is fitted and inserted between the recess and the center of the intermediate member, the fitting protrusion, and the fitting recess in the width direction,
A rail elastic fastening device, wherein the rail elastic fastening device is deviated from the center of the rail in the width direction toward the inner rail side of the rail by a predetermined amount. 2. The rail elastic fastening device according to claim 1, wherein the predetermined amount is about 10 to 30 mm.