JPH08184002A - Vibration isolator for sleeper - Google Patents

Abstract

PURPOSE: To prevent intrusion into a clearance between the upright wall and vibrationproof pad of a vibrationproof box of the small lumps of ballast filled onto the top face of a concrete road-bed. CONSTITUTION: A bottom vibrationproof pad 10 borne to a concrete road-bed 3, inserted into an upwards opened vibrationproof box 8 and used for bearing load is abutted against the underside of a concrete sleeper 1, and side-section vibrationproof pads 9 for bearing lateral pressure are interposed among the lower both side faces 17 of the concrete sleeper 1 and the upright walls 16 of the vibrationproof box 8. A dustproof cover 11 with a recessed section along both side faces and end faces of the concrete sleeper 1 is disposed onto the top face of the concrete road-bed 3. The internal side edges 27 of the dustproof cover 11 are bent upwards, and attached closely onto the upper side faces 29 and upper end faces of the concrete sleeper 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeper anti-vibration device installed on a concrete roadbed, and more particularly to a sleeper anti-vibration device capable of absorbing loads applied to the sleeper vertically and horizontally. It is a thing.

[0002]

2. Description of the Related Art As a vibration damping device for concrete sleepers for railways, one disclosed in Japanese Patent Publication No. 57-36363 has been proposed. In this conventional technique, as shown in FIG. 8, the concrete slab 2 that constitutes the floor of the tunnel is used.
A concrete track bed 3 is placed on the concrete railroad track 3 and the concrete sleepers 1 supporting the rails 4 are supported on the concrete track bed 3 via vibration-proof elastic bearing units 5 arranged at both ends of the concrete sleeper 1. ing. 6 is a metal fitting for fixing the rail 4 to the concrete sleeper 1, and 7 is a drain gutter at the center of the track.

The above-mentioned vibration-proof elastic bearing unit 5 is composed of a vibration-proof box 8 and an elastic vibration-proof member housed therein. The anti-vibration box 8 has a bottom plate, both side walls rising from the end of the bottom plate, and outer end walls, and is open at the top. A bottom vibration isolating pad 10 for supporting a load such as a sponge is housed in the bottom of the vibration isolating box 8, and the lower surface of the concrete sleeper 1 is placed on the bottom vibration isolating pad 10. The vertical vibration applied to 1 is absorbed. Further, side pressure bearing side vibration-isolating pads are also interposed between the lower side surface and the lower end surface of the concrete sleeper 1 and both side walls and the outer end wall of the vibration-proof box 8. The horizontal vibration applied to the concrete sleeper 1 is absorbed.

[0004]

In the conventional anti-vibration device for sleepers, the end of the concrete sleeper 1 is fitted in the anti-vibration box 8 via the bottom anti-vibration pad 10 and the side anti-vibration pads. At this time, there is no gap in the vibration isolation box 8. Therefore, the deformation of the bottom vibration-damping pad 10 and the side vibration-damping pad is restricted inside the vibration-damping box 8 and cannot be sufficiently deformed, which limits the vibration-damping function. As a method for solving this problem, it is conceivable to provide a fixed gap between the bottom vibration-damping pad 10 and the side vibration-damping rubber and the inner surface of the vibration-damping box 8. However, even in this case, a small piece of sound-proofing ballast filled on the concrete roadbed 3 forms a gap between each anti-vibration pad and the standing wall of the anti-vibration box 8 and each anti-vibration pad and the concrete sleeper. By entering the gaps and significantly reducing the expansion and contraction function of each anti-vibration pad, and by dropping this small piece from the gaps to fill the voids, deformation of each anti-vibration pad is prevented and the anti-vibration function is reduced. There's a problem. It is an object of the present invention to provide a sleeper anti-vibration device that solves the above problems.

[0005]

In order to achieve the above object, the vibration isolator for sleepers according to the present invention is supported by a concrete roadbed 3 and is fitted into a vibration isolation box 8 opened upward. The bottom vibration-isolating pad 10 for supporting the load that is in contact with the lower surface of the concrete sleeper 1 is contacted with the lower both side surfaces 17 of the concrete sleeper 1 and the standing wall 1 of the vibration-proof box 8.
6, a side anti-vibration pad 9 for lateral pressure bearing is interposed, and a dust-proof cover 1 having recesses along both side surfaces and end surfaces of the concrete sleeper 1 on the upper surface of the concrete base 3
1 and 25 are arranged, and the inner edge of the dustproof cover is bent and brought into close contact with both side surfaces and end surfaces of the concrete sleeper 1.

The dust cover 11 is fixed to the upper surface of the concrete roadbed 3, and the inner edge 27 thereof may be bent upward along the upper end surface 28 and the upper side surface 29 of the concrete sleeper 1. In addition, the dustproof cover 25
Inner edge 32 of the lower end face 1 of the concrete sleeper 1
8 and the lower side both side surfaces 17 may be bent and sandwiched between the lower side both side surfaces 17 and the side vibration isolating pad 9.

[0007]

According to the structure of the present invention, the dustproof covers 11 and 25 are provided.
Extends from the concrete roadbed 3 to both side surfaces and end surfaces of the concrete sleeper 1 and is in close contact with each part, so that the small blocks of the silencing ballast 22 filled on the upper surface of the concrete roadbed 3 are side parts. The anti-vibration pad 9 and the standing wall 16 of the anti-vibration box 8 and the gap between the anti-vibration member and the both side surfaces of the concrete sleeper 1 do not enter into the gap, and therefore the side anti-vibration pad passes through this gap. 9 lower space 21
Never break into.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 5 show a first embodiment of the present invention.
Is a vertical sectional view showing a vibration isolator of the PC concrete sleeper 1, and FIG. 2 is a plan view. As shown in each figure, both ends of the concrete sleepers 1 juxtaposed on the concrete roadbed 3 are supported by the concrete roadbed 3 via vibration-proof elastic bearing units 15.

The vibration-proof elastic bearing unit 15 includes a vibration-proof box 8 and
The vibration isolating box 8 is comprised of a load bearing bottom vibration isolating pad 10, a lateral pressure bearing side vibration isolating pad 9 made of an elastic material such as rubber or synthetic resin, and a dust cover 11. The anti-vibration box 8 is composed of a bottom plate 12, both side walls 13 and outer end walls 14 standing upright from the ends of the bottom plate 12 (hereinafter, the side walls 13 and the outer end wall 14 are collectively referred to as standing walls 16), The bottom vibration isolating pad 10 is mounted on the bottom plate 12, and the bottom surface of the concrete sleeper 1 is in contact with the top surface of the bottom vibration isolating pad 10. The side anti-vibration pad 9 is mounted between the upright wall 16 of the anti-vibration box 8 and the lower side surfaces 17 and the lower end surface 18 of the concrete sleeper 1. Also,
The concrete sleeper 1 and the side anti-vibration pad 9 are fixed with a fixing screw 20 schematically shown.

According to the above sleeper antivibration device, the vertical load applied to the concrete sleeper 1 is the bottom antivibration pad 1
0, and the lateral load is received by the side vibration isolating pad 9, whereby the concrete sleeper 1 is smoothly vibrated. In this case, the bottom vibration isolation pad 10
In order to allow smooth deformation of the side vibration damping pad 9 and ensure the vibration damping effect, the side of the bottom vibration damping pad 10 and the lower side of the side vibration damping pad 9 are arranged in the vibration damping box 8. Is
A void 21 is formed.

In this embodiment, the sound deadening ballast 22 filled on the concrete roadbed 3 is provided with a gap 23 between the side vibration isolating pad 9 and the standing wall 16 of the vibration isolating box 8.
And the side vibration isolating pad 9 and the lower side surfaces 17 of the concrete sleeper 1 do not enter the gap 24, and the gap 2
A dustproof cover 11 is provided to close the gaps 23 and 24 so as not to enter the gap 21 through the holes 3 and 24.
That is, there is usually no gap between the standing wall 16 of the vibration isolation box 8 and the lower side surfaces 17 of the concrete sleeper 1 by the side anti-vibration pad 9, but the concrete sleeper 1
When the side anti-vibration pad 9 expands and contracts due to repeated vibrations, the gaps 23 and 24 temporarily expand, and the small pieces of the ballast 22 sandwich between them, which damages the side anti-vibration pad 9 and It leads to deterioration of shaking function. Furthermore, the gap 23,
The small pieces of the ballast 22 sandwiched in 24 are gradually dropped due to the repeated expansion and contraction of the side anti-vibration pad 9 and fall into the gap 21.
Fill this in. In that case, there is no space for escape when the bottom vibration damping pad 10 and the side vibration damping pad 9 are deformed, and the vibration damping function of both members is reduced.

In this embodiment, however, the dust cover 11 prevents the concrete sleeper 1 and the standing wall 16 of the vibration-proof box 8 from rising.
The gap between and is closed. The dustproof cover 11 is formed of a sheet material such as rubber or flexible synthetic resin, and has a recess 26 formed by notching the inside as shown in the perspective view of FIG. This dust cover 11
As shown in FIGS. 1 and 2, the recesses 26 are arranged so that the edges of the recesses 26 extend along the lower end surface 18 and the lower both side surfaces 17 of the concrete sleeper 1. In addition, 3 of the recess 26
The two inner edges 27, 27, 27 are formed by being bent upward. The dustproof cover 11 may be formed by cutting a long sheet material having a predetermined width, or may be formed by a molding die. In the case of using a molding die, the corner portion may be formed at a right angle at the time of molding, the post-molding position of the dotted line 35 may be cut off, and the ear piece 36 may be cut off so that the corner portion is rounded.

In this embodiment, as shown in FIG. 1, the horizontal portion of the dustproof cover 11 is arranged on the upper surface of the concrete roadbed 3 and the upper surface of the side vibration isolating pad 9 housed in the vibration isolating box 8, and The inner edge 27 bent upward is brought into close contact with the upper end surface 28 and the upper side surface 29 of the concrete sleeper 1, and the two are fixed by adhesion. The horizontal portion of the dustproof cover 11 does not have to be fixed to the concrete roadbed 3 side. Concrete sleepers 1
The soundproofing ballast 22 is filled on the upper side of the dustproof cover 25 provided on the upper surface of the concrete roadbed 3 so as to cover the outer side of the end portion of the soundproofing. In this case, in the opening of the vibration-proof box 8, the gap formed between the standing wall 16 and the concrete sleeper 1 is covered with the dust-proof cover 11, so that the small lumps of the ballast 22 do not enter the gap 21 from this gap.

6 and 7 show a second embodiment of the present invention.
In this second embodiment, 3 along the recess 31 of the dustproof cover 25
This is different from the first embodiment in that the two inner edges 32, 32, 32 are bent downward and the inner edge 32 is sandwiched between the side vibration isolating pad 9 and the concrete sleeper 1, and the other configuration is different. Is the same as in the first embodiment.

To explain further, a fixing screw 20 is provided so as to penetrate downwardly through the side vibration isolating pad 9 and the inner edge 32 of the downward folding of the dustproof cover 25, and the fixing screw 20 is attached to the concrete sleeper 1. By screwing into the female thread portion of the embedded screw receiving member 33, the inner edge 32 of the dust cover 25 bent downward is closely fixed to the lower side surfaces 17 and the lower end surface 18 of the concrete sleeper 1. The horizontal part of the dust cover 25 does not have to be fixed to the upper surface of the concrete track.

Also in the second embodiment, the inner edge 32 of the dust cover 25 bent downward is closely fixed to both lower side surfaces 17 of the concrete sleeper 1, so that the side vibration-proof pad 9 and the concrete sleeper 1 are joined together. Gap 24 and
Since the gap 23 between the side vibration isolating pad 9 and the standing wall 16 is covered with the dustproof cover 25, the small pieces of the ballast 22 will not enter the gap. In the second embodiment, the small projection 34 projects from the bottom plate 12 of the vibration isolation box 8, and the bottom vibration isolation pad 10 is provided so as to contact the small projection 34. The gap 21 is prevented from slipping and the gap 21 is securely held.

The present invention can be appropriately modified in addition to the above-described embodiment, and for example, the plane shapes of the dustproof covers 11 and 25 and the fixing means with the concrete sleeper 1 are not limited to the configuration of the embodiment.

[0018]

According to the present invention, since the anti-vibration elastic bearing unit 15 is provided with the anti-dust covers 11 and 25, the small lumps of the silencing ballast 22 filled on the upper surface of the concrete roadbed 3 are laterally anti-vibrated. It is possible to eliminate the risk of damaging the side vibration isolating pad 9 by entering the gap between the pad 9 and the standing wall 16 of the vibration isolating box 8 or the gap between the side vibration isolating pad 9 and the concrete sleeper 1. It is possible to eliminate the possibility that the antivibration function of the partial antivibration pad 9 is deteriorated. Further, it is possible to reliably prevent small pieces of the ballast 22 from passing through the gap and entering the gap 21, and the gap 21 can be held for a long period of time, so that the bottom vibration-damping pad 10 and the side vibration-damping pad 9 can be prevented. It can be deformed smoothly and the sleeper's anti-vibration function can be exerted for a long period of time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a first embodiment of a sleeper anti-vibration device according to the present invention.

FIG. 2 is a plan view of FIG.

3 is a perspective view of the dustproof cover shown in FIG. 1. FIG.

FIG. 4 is a sectional view of the dustproof cover of FIG. 3 cut along line aa,
It is a section explanatory view in the state where it was attached to a vibration-proof box.

5 is a sectional view taken along line bb of the dustproof cover of FIG.
It is a partial cross-section explanatory drawing of the state attached to the anti-vibration box.

6 is an enlarged cross-sectional view of a portion A of FIG.

FIG. 7 is a plan view of a second embodiment of the sleeper anti-vibration device according to the present invention.

FIG. 8 is a cross-sectional explanatory view of a conventional sleeper vibration isolator.

[Explanation of symbols]

 1 Concrete sleepers 2 Concrete slabs 3 Concrete roadbeds 4 Rails 5 Anti-vibration elastic bearing units 6 Fixing fittings 7 Central drainage gutters 8 Anti-vibration boxes 9 Side anti-vibration pads for lateral pressure bearings 10 Bottom anti-vibration pads for load bearings 11 Dust protection Cover 12 Bottom plate 13 Both side walls 14 Outer end wall 15 Anti-vibration elastic bearing unit 16 Standing wall 17 Lower both side surfaces 18 Lower end face 20 Fixing screw 21 Void 22 Ballast 23 Gap 24 Gap 25 Dust cover 26 Recess 27 Inner edge 28 Upper end face 29 Upper part Side surface 31 Recessed portion 32 Inner edge 33 Screw receiving member 34 Small protrusion

Claims (3)

[Claims] 1. A concrete roadbed 3 is supported,
Further, the load-bearing bottom anti-vibration pad 10 fitted in the anti-vibration box 8 opened upward is brought into contact with the lower surface of the concrete sleeper 1 and the lower both side surfaces 17 of the concrete sleeper 1 and the anti-vibration box 8 are attached. 1. A side anti-vibration pad 9 for supporting the side pressure is interposed between the standing wall 16 and a dust-proof cover 11, 25 having concave portions along the both side surfaces and the end surface of the concrete sleeper 1 on the upper surface of the concrete road bed 3. And a structure in which the inner edges of the dustproof covers 11 and 25 are bent and brought into close contact with both side surfaces and end surfaces of the concrete sleeper 1. 2. The dust cover 11 is fixed to the upper surface of the concrete roadbed 3, and an inner edge 27 thereof is bent upward along an upper end surface 28 and an upper side surface 29 of the concrete sleeper 1. The vibration damping device for sleepers according to claim 1. 3. The inner edge 32 of the dust cover 25 has a lower end surface 18 and lower side surfaces 17 of the concrete sleeper 1.
The sleeper anti-vibration device according to claim 1, wherein the anti-vibration device for sleepers is folded along the lower side surfaces 17 and sandwiched between the lower side surfaces 17 and the side pressure bearing side anti-vibration pad 9.