JP2008095408A - Sound control structure of railroad rail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide sound control structure of a railroad rail of simple structure requiring no running cost. <P>SOLUTION: First sound insulating members 16 each formed by laminating a sound insulating sheet 12 and a sound insulating cover 14 are disposed facing with a space so as not to abut on the side face of a railroad rail web 10a formed of a steel material, along the length direction of the railroad rail 10. The sound insulating sheet 12 is a rubber or plastic sheet with rubber-like elasticity with a wall thickness of about 1.8 mm. The sound insulating cover 14 is formed by bending a steel plate with a wall thickness of 0.8-1.2 mm into predetermined shape. The sound insulating cover 14 serves also to hold the shape of the sound insulating sheet 12. The sound insulating sheet 12 is arranged on the inside which faces the side face of the railroad rail web 10a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention particularly relates to a sound control structure of a railroad rail suitable for reducing high-frequency squeak noise generated when a train passes a sharp curve.

In recent years, high-frequency squeaking noise that occurs when a train passes a sharp curve has become a problem, and reduction thereof is desired. The squeak noise is generated when the railway rails and train wheels are placed under special circumstances, but at present there is no theory that can explain the phenomenon clearly. Conventionally, measures have been taken to reduce the squeak noise, but there has been no decisive squeak noise reduction means. For example, there is a rail oil applicator as a relatively effective means, which is widely adopted. Moreover, the method of reducing a railway noise is also considered by sticking a soundproof material along the length direction to the side part side surface of a railway rail (refer patent document 1).
JP-A-10-152801

  However, the rail oil applicator is expensive to install, and after installation, maintenance is required and running costs are high, so it cannot be easily installed. In addition, the oil applicator may interfere with train operation, so use in steep slope sections or near stations is restricted, and there are many sections that cannot be installed. Further, the method of attaching the soundproof material to the side surface of the railroad rail is not so good in soundproofing effect that the structure of the soundproofing material becomes complicated and the cost is increased in order to obtain a predetermined noise preventing effect.

  The present invention has been made paying attention to the above points, and it is an object of the present invention to provide a railway rail sound-damping structure that requires no running cost and has a simple structure.

In each embodiment of the present invention, the above-described problems are solved by the following configurations.
<Configuration 1>
The first sound insulation member formed by laminating the sound insulation sheet and the sound insulation cover faces each other at an interval so as not to contact the abdomen side surface of the railroad rail made of steel, and is arranged along the length direction of the railroad rail. Railway rail sound control structure characterized by the installation.

  Since the first sound insulation member is disposed at an interval so as not to contact the abdomen side surface of the railroad rail, the vibration noise of the abdominal portion of the railroad rail is insulated, so that a good noise suppression effect can be obtained. In particular, it is effective in reducing high-frequency squeaking noise that occurs when a train passes a sharp curve.

<Configuration 2>
In the sound control structure for a railway rail according to Configuration 1, a second sound insulating member formed by laminating a sound insulating sheet and a sound insulating cover is brought into contact with the bottom surface of the bottom of the rail, and in the length direction of the rail. Railway rail sound-absorbing structure, characterized by being arranged along.

  Effectively insulates vibration noise from the bottom surface of the railroad rail in the depth direction of the ground.

<Configuration 3>
The railway rail sound-damping structure according to Configuration 1 or 2, wherein the first sound-insulating member and the second sound-insulating member are continuously connected.

  The installation work of the sound insulation member can be shortened, and a better sound suppression effect is exhibited.

<Configuration 4>
In the sound control structure for a railroad rail according to any one of the first to third aspects, a fixture for pressing the outer surface of the sound insulation cover of the first sound insulation member and / or the second sound insulation member is provided. Sound control structure of railway rails.

<Configuration 5>
In the sound control structure for a railroad rail according to any one of Configurations 1 to 4, a rubber cushioning member is interposed between the sound insulating cover of the first sound insulating member and the top portion of the railroad rail. Sound control structure of railway rails.

  With the rubber cushioning member, it is possible to prevent vibration noise from being transmitted from the railroad rail to the sound insulation cover and to prevent intrusion of water such as rainwater.

<Configuration 6>
In the sound control structure of a railroad rail according to any one of configurations 1 to 5, a sound insulating sheet and a sound insulating cover are provided between the bottom portion of the railroad rail and the ground supporting the railroad rail via sleepers. A railway rail sound-suppressing structure comprising a laminated third sound insulation member.

  Effectively insulates the vibrations of railroad rails that emerge from the cavities between sleepers.

  Hereinafter, embodiments of the present invention will be described in detail for each example.

FIG. 1 is a cross-sectional view showing an embodiment of the railroad noise control structure of the present invention, and FIG. 2 is a side view of the embodiment.
In these figures, the code | symbol 10 has shown the railroad rail which consists of steel materials. A first sound insulation member 16 formed by laminating a sound insulation sheet 12 and a sound insulation cover 14 is disposed on both side surfaces of the abdomen 10 a of the rail 10 along the length direction of the rail 10.

  Two sets of the first sound insulation members 16 are prepared, and face each other with an interval so that the sound insulation sheet 12 is inside, the sound insulation cover 14 is outside, and they are not in contact with the side surface of the abdomen 10a of the railroad rail. Has been placed. Further, a second sound insulation member 20 having the same structure as that of the first sound insulation member 16 is in contact with the bottom bottom surface of the rail 10 and is disposed along the length direction of the rail 10.

  As each sound insulation sheet 12 of the first sound insulation member 16 and the second sound insulation member 20, a synthetic rubber plate having a thickness of 1.8 mm is used. As the sound insulation cover 14, a steel plate having a thickness of 1.2 mm which is bent into a U shape covering the sound insulation sheet 12 is used.

The sound insulating sheet 12 may be a rubber plate other than synthetic rubber or a plastic plate having rubber-like elasticity. The sound insulation cover 14 is formed by bending a steel plate having a wall thickness of 0.8 mm to 1.2 mm into a predetermined shape, for example, and the sound of the vibration from the abdominal portion 10a of the rail is sound-insulated and the shape of the sound insulation sheet 12 There is also a role to hold.
In addition, each thickness of the sound insulation sheet 12 and the sound insulation cover 14 does not stick to said numerical value. It is designed to the necessary wall thickness as appropriate. The first sound insulation member 16 and the second sound insulation member 20 may be configured by alternately laminating a plurality of sound insulation sheets 12 and a sound insulation cover 14.

  The outer surface of the sound insulation cover 14 of the first sound insulation member 16 and / or the second sound insulation member 20 is pressed by a fixture 22. The fixture 22 is formed by bending a plate body made of a steel plate or the like according to the outer surface of the sound insulation cover 14, arranged at an appropriate interval in the length direction of the rail 10, and the sound insulation cover 14 by screws 24. It is fixed to.

  A rubber cushion member 26 is interposed between the sound insulation cover 14 of the first sound insulation member 16 and the top of the rail 10 as necessary. The rubber cushioning member 26 is in close contact with the sound insulation cover 14 and the rail 10, prevents vibration noise from being transmitted from the rail 10 to the sound insulation cover 14, and water such as rainwater enters the inside of the first sound insulation member 16. To prevent it.

  According to the first embodiment, the first sound insulation member 16 is disposed at an interval so as not to contact the abdomen side surface of the railroad rail. Sound suppression effect. In particular, it is effective in reducing high-frequency squeaking noise that occurs when a train passes a sharp curve.

FIG. 3 is a sectional view showing a second embodiment of the present invention. Portions common to the portions shown in FIG.
In this embodiment, of the two sets of first sound insulation members 16, one (left side in the figure) of the first sound insulation member 16 and the second sound insulation member 20 are connected in a continuous manner. This extends from the side surface of the rail top 10b to the side of the rail bottom 10c, and is further arranged to contact the bottom surface of the bottom 10c. Further, one end portion of the second sound insulation member 20 and the other lower end portion of the first sound insulation member 16 (right side in the figure) are joined and stopped with screws 34. Therefore, the sound insulation cover 14 has the same function as the fixture 22 of FIG.

  The first sound insulation member 16 faces with a gap so as not to contact the side surface of the abdomen 10a of the railroad rail. The first sound insulation member 16 and the second sound insulation member 20 are disposed along the length direction of the rail 10. By connecting the first sound insulation member 16 and the second sound insulation member 20 in a continuous manner, it is possible to reduce the trouble of attaching the sound insulation member.

  As each sound insulation sheet 12 of the first sound insulation member 16 and the second sound insulation member 20, a synthetic rubber plate having a thickness of 1.8 mm is used. As the sound insulation cover 14, a steel plate having a thickness of 0.8 mm that covers the sound insulation sheet 12 and is bent into a U shape according to the dimensions of the rail 10 is used.

FIG. 4 is a sectional view showing a third embodiment of the present invention. Portions common to those shown in FIG. 3 are given the same reference numerals, and redundant description is omitted.
This embodiment is different from the second embodiment in the end structure of the portion of the first sound insulating member 16 that contacts the top of the rail 10. That is, the sound insulation cover end portion 14a of the first sound insulation member 16 is integrally covered with a rubber member, and this has the same function as the rubber cushioning member 26 of the first embodiment. Other configurations are the same as those of the second embodiment.

  As each sound insulation sheet 12 of the first sound insulation member 16 and the second sound insulation member 20, a synthetic rubber plate having a thickness of 1.8 mm is used. As the sound insulation cover 14, a steel plate having a thickness of 0.8 mm which is bent into a U shape covering the sound insulation sheet 12 is used.

FIG. 5A is a sectional view showing a fourth embodiment of the present invention, and FIG. 5B is a side view showing a fixture used in the embodiment. Portions common to the portions shown in FIG.
This embodiment is different from the first embodiment in the structure of the fixture for pressing the outside of the first sound insulation member 16 and the second sound insulation member 20. In other words, the fixing device 36 that presses the first sound insulating member 16 and the fixing member 38 that presses the outside of the second sound insulating member 20 are separated.

  The fixture 36 is formed of a slope portion 36a along the outside of the first sound insulation member 16, and a saddle-type edge portion 36b that is continuous with the slope portion 36a and covers the side surface of the rail rail bottom portion 10c. As shown in FIG. 5B, the inclined surface portion 36a is provided with a long hole 37 for mounting the mounting bolt 40. The mounting bolt 40 passes through the fixture 36 and the first sound insulation member 16 and fixes both.

  The fixing tool 38 is a hook-shaped edge part 38 a fitted to the hook-shaped edge part 36 b of the fixing tool 36, and a plane extending to the hook-shaped edge part 38 a and extending along the outside of the second sound insulating member 20. It is formed of a portion 38b and a vertical edge portion 38c that is continuous with the flat portion 38b and bent vertically. As shown in FIG. 5B, two long holes 39 for mounting the mounting bolts 42 are provided side by side on the vertical edge 38c.

  Two sets of two fixtures 36 and 38 are arranged outside the first sound insulating member 16 and the second sound insulating member 20 that cover both side surfaces and the bottom portion 10c of the rail 10, and the mounting bolt 40 and the mounting bolt 42 are used. Each is fixed by tightening. Other configurations are substantially the same as those of the first embodiment.

FIG. 6 is a cross-sectional view showing a fifth embodiment of the present invention.
In this embodiment, a sound insulation sheet 12 and a sound insulation cover 14 similar to those of the first sound insulation member 16 are provided between the bottom 10c of the rail 10 and the ground 30 that supports the rail 10 via a sleeper 28. A third sound insulation member 32 formed by laminating layers is disposed. The third sound insulation member 32 is intermittently disposed along the length direction of the rail 10 so as to shield a cavity (not shown) between the ground 30 and the rail 10 that is partitioned by the sleepers 28. Is done. By disposing the third sound insulation member 32, the vibration sound emitted from the cavity between the sleepers 28 to the side is effectively insulated.

  FIG. 7 shows a railroad rail (conventional example) that does not use sound-suppressing means and a railroad rail (examples 1 to 3 described above) with a sound insulation member, and is placed at the center point on the upper surface of each railroad rail in the reverberation room. It is the figure which showed the comparative data which dropped the hard sphere, generated the simulated noise, measured the generated noise level with the sound level meter, and analyzed the frequency. The data was tested five times and the average value was taken. The measured values are shown in FIG. 7 (a), and are graphed and shown in FIG. 7 (b).

  The creaking sound that occurs when the train passes through a sharp curve is a high frequency range of 1 KHz to 10 KHz. As shown in FIG. 7, the noise levels of Examples 1 to 3 are particularly a high frequency range of 6 KHz to 8 KHz. Therefore, it is lower than the conventional example.

It is sectional drawing which shows one Example of the sound-damping structure of the railroad rail of this invention. It is a side view of the same Example. It is sectional drawing which shows the 2nd Example of this invention. It is sectional drawing which shows the 3rd Example of this invention. It is sectional drawing which shows the 4th Example of this invention. It is sectional drawing which shows the 5th Example of this invention. It is a figure which shows the noise level with respect to each frequency of the railroad rail which does not use the noise suppression structure of a railroad rail of this invention, and a noise suppression means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Railroad rail 12 Sound insulation sheet 14 Sound insulation cover 16 1st sound insulation member 20 2nd sound insulation member 22 Fixing tool 24 Screw 26 Rubber buffer member 28 Sleeper 30 Ground 32 3rd sound insulation member

Claims (6)

  The first sound insulation member formed by laminating the sound insulation sheet and the sound insulation cover faces each other at an interval so as not to contact the abdomen side surface of the railroad rail made of steel, and is arranged along the length direction of the railroad rail. Railway rail sound control structure characterized by the installation. In the sound control structure of a railroad rail according to claim 1,
A railway rail comprising: a second sound insulation member formed by laminating a sound insulation sheet and a sound insulation cover, which is in contact with a bottom lower surface of the railroad rail, and is disposed along a length direction of the railroad rail. Suppression structure. In the sound control structure of a railroad rail according to claim 1 or 2,
A sound-damping structure for a railroad rail, wherein the first sound-insulating member and the second sound-insulating member are continuously connected. In the sound-damping structure of the railroad rail in any one of Claims 1-3,
A railway rail sound-suppressing structure, comprising: a fixing member that holds an outer surface of a sound insulation cover of the first sound insulation member and / or the second sound insulation member. In the sound control structure of the railroad rail according to any one of claims 1 to 4,
A railway rail noise control structure, wherein a rubber cushioning member is interposed between a sound insulation cover of the first sound insulation member and a top portion of the rail. In the sound control structure of a railroad rail according to any one of claims 1 to 5,
A third sound insulation member formed by laminating a sound insulation sheet and a sound insulation cover is disposed between the bottom of the rail and the ground supporting the rail through a sleeper. Sound control structure of railway rails.

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