JP2008280722A - Sound deadening structure for railroad rail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sound deadening structure for a railroad rail which is easy to be manufactured with satisfactory fire resistance and flame resistance. <P>SOLUTION: A sound insulating member 16 having glass cloth 20 laminated on the outer surface of a sound insulating sheet 12 formed of a rubber material containing magnetized magnetic powder is magnetically attached to the body side surface and the bottom upper surface of a railroad rail 10 formed of a steel product with the glass cloth 20 outside, and disposed along the longitudinal direction of the rail. A sound absorbing body including massy glass wool entirely enclosed by glass cloth may be disposed opposite to the bottom lower surface of the railroad rail and intermittently disposed along the longitudinal direction of the rail. Since the sound insulating sheet 12 is protected by the glass cloth 14, the fire resistance and flame resistance of the sound insulating member 16 can be enhanced. <P>COPYRIGHT: (C)2009,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. A method of reducing railway noise by attaching a damping material to the side surface of the railway rail with an adhesive is also considered (see Patent Document 1). In addition, a magnetic damping material made of a polymer viscoelastic material containing magnetized magnetic powder and a belt-like restraint plate made of a metal material or a synthetic resin material are laminated. One that is magnetically mounted on the side surface of the side portion is considered (see Patent Document 2 and Patent Document 3).
JP-A-52-109206 Japanese Patent No. 3525020 Japanese Patent No. 3679232

  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. In addition, the method of applying the soundproofing material to the side surface of the railroad rail with an adhesive is the process of applying the adhesive to the side surface of the railroad rail and the adhesive remaining on the side surface of the railroad rail when the soundproofing material is removed. Since the work for removing the rails is not easy and it is not easy to remove the rails from the rail, the work becomes complicated and the cost is increased.

  Also, the magnetic damping material that is magnetically mounted on the side surface of the railroad rail is easy to mount the magnetic damping material on the railroad rail, but the belt-like restraint plate placed on the outside is too hard to Arranging the installation shape to match the curved surface of the rail is a cumbersome operation. Conventionally, there is a risk that the sound insulating member may be damaged by sparks generated from wheels or rails while the train is traveling on the railroad rail, but this measure is hardly taken.

  The present invention has been made paying attention to the above points, and an object of the present invention is to provide a sound-damping structure for a rail that is easy to manufacture and has good fire resistance and flame resistance.

The following configurations are means for solving the above-described problems.
<Configuration 1>
A sound insulation member in which a glass cloth is laminated on the outer surface of a sound insulation sheet made of a rubber material containing magnetized magnetic powder is magnetically attached to the abdomen side and bottom surface of a railroad rail made of steel with the glass cloth on the outside. And the railroad sound-damping structure characterized by arrange | positioning along the length direction of the said railroad rail.

  By protecting the sound insulation sheet with a glass cloth, the sound insulation member has good fire resistance and flame resistance. Therefore, it is possible to eliminate the possibility that the sound insulation sheet is damaged by sparks generated from wheels or rails while the train is traveling on the railroad rail. Further, since the sound insulation sheet has magnetism and the flexibility is not impaired by the glass cloth, the sound insulation member can be easily and quickly attached along the curved surface of the railroad rail. It is effective in reducing high-frequency squeaking noise that occurs when a train passes a sharp curve.

<Configuration 2>
The sound control structure for a railroad rail according to Configuration 1, wherein a sound absorber formed by covering the entire surface of a lump of glass wool with a glass cloth is disposed opposite the bottom surface of the bottom of the railroad rail and along the length direction of the railroad rail. Railway rail noise control structure, characterized by being intermittently arranged.

  Sound from the lower part of the rail can be absorbed by the sound absorber. In particular, it effectively absorbs the sound reflected on the concrete road surface in tunnels. The sound absorber is easily attached by being installed between sleepers instead of wrapping the rail.

<Configuration 3>
The railway rail sound-damping structure according to Configuration 1 or 2, wherein a felt sound-absorbing material is interposed between the abdomen side surface of the rail and the sound-insulating member.

  A better sound-damping effect can be achieved by interposing a felt sound-absorbing material.

<Configuration 4>
In the railway rail noise control structure according to Configuration 3, a second sound insulation member having the same configuration as the sound insulation member is magnetically attached to the bottom surface of the rail and arranged along the length direction of the rail. The rail control structure of railway rails.

  Good noise control between the rail and the ground.

<Configuration 5>
In the railway rail sound-damping structure according to any one of Configurations 1 to 4, the outer surface of the sound insulation member is formed by bending both ends of a strip steel plate in accordance with the mounting positions of the sound insulation member, and the railway A railroad sound-damping structure characterized by being held down by a fixture disposed along the bottom bottom surface of the rail.

  Since the outer surface of the sound insulation member is pressed by the elasticity of the fixture, the sound insulation member can be easily fixed.

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

FIG. 1 is a cross-sectional view showing the sound-damping structure of the railroad rail of Example 1, and FIG. 2 is a side view of the same example.
In these figures, the code | symbol 10 has shown the railroad rail which consists of steel materials. A sound insulation member 16 formed by laminating a sound insulation sheet 12 and a glass cloth 14 is disposed along the length direction of the rail 10 on the side surface of the abdomen 10 a and the top surface of the bottom 10 b of the rail 10.

  The sound insulation sheet 12 of the sound insulation member 16 is magnetized and is magnetically attached to the rail 10. That is, the sound insulating sheet 12 is formed into a sheet having a thickness of 3 mm by mixing a known appropriate additive into butyl rubber containing magnetized ferrite (magnetic powder). The glass cloth 14 of the sound insulating member 16 is formed into a sheet shape having a thickness of 200 μm.

  The outer surface of the sound insulation member 16 is wound around a bottom and side surfaces of the rail rail bottom 10b and is pressed by a fixture 18 that is bent so that both ends abut against the top surface of the glass cloth 14. The fixture 18 is a strip-shaped steel plate made of, for example, SPCC having a thickness of 0.8 mm, and is formed by bending both ends of the strip-shaped steel plate in accordance with the attachment positions of the glass cloth 14. A plurality of fixtures 18 are arranged at appropriate intervals in the length direction of the rail 10 and press the outer surface of the glass cloth 14 with the elasticity of both bent ends. Since the outer surface of the sound insulation member is pressed by the elasticity of the fixture 18, the sound insulation member 16 can be easily fixed.

  The sound control structure of the railway rail configured as described above is effective in reducing high-frequency squeaking noise that occurs when a train passes a sharp curve. By protecting the sound insulation sheet 12 with the glass cloth 14, the sound insulation member 16 has good fire resistance and flame resistance, and an effect of insulating the vibration sound of the abdomen of the rail 10 can be obtained for a long period of time. Since the sound insulation sheet 12 has magnetism and the glass cloth 14 is flexible, the sound insulation member can be easily attached to the curved surface of the rail 10. Therefore, the sound insulation member can be attached easily and in a short time, and the production of the sound control structure is easy.

FIG. 3 is a cross-sectional view showing the sound-damping structure of the railroad rail according to the second embodiment, and FIG. 4 is a plan view of the second embodiment. Portions common to the portions shown in FIG.
In this embodiment, the following sound absorbing body 24 is added to the structure shown in FIG. That is, as shown in FIG. 3, a plurality of sound absorbers 24, each of which covers the entire surface of a lump glass wool 22 with a glass cloth 20, are arranged opposite to the lower surface of the bottom 10b of the rail, and the rail as shown in FIG. The rails 10 are sequentially installed along the length direction of the rails 10.

  The sound absorbing body 24 is formed by covering the entire surface with a glass cloth 20 of 32 kg / m 3 of bulk glass wool molded into a rectangular parallelepiped having a length of 1820 mm, a width of 300 mm, and a height of 100 mm. An edge 29 having a through hole for inserting the fixing bolt 26 is provided at the bottom of the sound absorber 24 so as to protrude laterally. The edge portion 29 is painted black and molded to have a lateral length of 100 mm, a width of 300 mm (same as the sound absorber 24), and a height (thickness) of 2.3 mm. As shown in FIG. 4, the sound absorber 24 is intermittently disposed between the sleepers 30 that support the railroad rail 10, and is attached so that the edge portion 29 is fixed to the ground 28 by a fixing bolt 26 made of, for example, SS400. It has been.

  By configuring the railway rail sound-damping structure as described above, it is possible to effectively absorb the vibration sound coming from the bottom surface of the bottom 10b of the railway rail in the depth direction of the ground 28.

FIG. 5 is a cross-sectional view showing a sound control structure of a railroad rail according to the third embodiment. Portions common to the portions shown in FIG.
In this embodiment, a felt sound absorbing material 34 is interposed between the abdomen side surface of the rail 10 and the sound insulating member 16. Other configurations are the same as those of the second embodiment. As the felt sound absorbing material 34, a sheet-like material having a thickness of 10 mm is used.

  In this way, the felt sound-absorbing material is interposed, so that a better sound-damping effect is exhibited.

FIG. 6 is a cross-sectional view showing the sound-damping structure of the railroad rail according to the fourth embodiment. Portions common to the portions shown in FIG.
In this embodiment, the following second sound insulation member 36 is added to the structure shown in FIG. Other configurations are the same as those of the third embodiment.

  The second sound insulation member 36 has the same configuration as that of the sound insulation member 16, and is disposed along the length direction of the railroad rail 10 by being magnetically attached to the bottom surface of the bottom portion 10 b of the railroad rail 10. A good noise suppression effect is exhibited between the rail 10 and the ground.

  FIG. 7 shows a railroad rail (conventional example) that does not use sound-suppressing means and a railroad rail (examples 1 to 4 described above) provided with a sound insulation member. 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 squeak noise that occurs when the train passes through a sharp curve is a high frequency range of 1 KHz to 10 KHz. However, as shown in FIG. 7, the noise level of Examples 1 to 4 is particularly a high frequency range of 4 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 a top view of the Example. 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 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 Glass cloth 16 Sound insulation member 18 Fixing tool 20 Glass cloth 22 Bulk glass wool 24 Sound absorber 26 Fixing bolt 28 Ground 29 Edge 30 Sleeper

Claims (5)

  A sound insulation member in which a glass cloth is laminated on the outer surface of a sound insulation sheet made of a rubber material containing magnetized magnetic powder is magnetically attached to the abdomen side surface and bottom top surface of a railroad rail made of steel with the glass cloth facing outside. And the railroad sound-damping structure characterized by arrange | positioning along the length direction of the said railroad rail. In the sound control structure of a railroad rail according to claim 1,
A railway comprising a bulky glass wool covering the entire surface with a glass cloth, disposed opposite to the bottom surface of the bottom of the rail, and intermittently arranged along the length of the rail Rail control structure. In the sound control structure of a railroad rail according to claim 1 or 2,
A railroad sound-damping structure, wherein a felt sound-absorbing material is interposed between an abdomen side surface of the railroad rail and the sound insulation member. In the sound control structure of a railroad rail according to claim 3,
2. A railway rail sound-suppressing structure, wherein a second sound insulation member having the same configuration as the sound insulation member is magnetically attached to the bottom surface of the railway rail and disposed along the length direction of the rail. The sound-damping structure for a railroad rail according to any one of claims 1 to 4,
The outer surface of the sound insulation member is bent by the both ends of the belt-shaped steel plate according to the mounting position of the sound insulation member, and is held by a fixture disposed along the bottom lower surface of the rail. The sound control structure of a railroad rail that is characterized by

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