JP4695487B2 - Rail soundproof structure - Google Patents

Description

  The present invention relates to a soundproof structure for a rail that reduces noise generated by vibration of the rail.

  In a conventional rail soundproof structure (prior art 1), a mortar vibration damping material made of a mixture of rubber or synthetic resin and mortar is bonded to the rail abdomen (see, for example, Patent Document 1). In this prior art 1, the vibration generated from the rail when the vehicle passes on the rail is suppressed by the mortar damping material, and the noise from the rail is reduced.

  A conventional rail soundproofing structure (conventional technology 2) includes a pair of soundproofing materials having vibration damping properties such as lead, a pair of hardwares respectively holding the pair of soundproofing materials, and a pair of hardware for fastening the pair of hardwares. A fastening screw or the like is provided (for example, see Patent Document 2). In this prior art 2, soundproofing materials are arranged on both side surfaces of the rail abdomen, and the hardware is pressed against the soundproofing material by tightening a tightening screw, and the soundproofing materials are fixed to both side surfaces of the rail abdomen.

  A conventional rail soundproof structure (Prior Art 3) is a magnetic composite type control having a divided structure in which a polymer viscoelastic layer containing magnetic powder and a constraining plate for restraining the polymer viscoelastic layer are laminated. The rail is covered with a vibrating material (see, for example, Patent Document 3). In this prior art 3, magnetic composite damping materials are mounted from the left and right sides of the rail so that the polymer viscoelastic layer is in close contact with the rail, and the rail is covered with this magnetic composite damping material. Noise generated by rail vibration is reduced.

JP 52-109206 A

Japanese Patent Laid-Open No. 10-152801

Japanese Patent Laid-Open No. 10-159896

  In the prior art 1, the adhesive strength of the mortar is used to fix the damping material. However, in order to perform this construction, it is necessary to have a ground treatment for cleaning the rail before construction, and the mortar is hardened after construction. There was a problem that the construction was difficult, for example, the train could not run for a certain period of time to keep the site. Further, in the prior art 1, in order to increase the vibration damping effect, it is necessary to increase the thickness of the mortar vibration damping material, and as the thickness increases, the weight also increases. There was a problem that could not be fixed. Furthermore, there is a problem that durability and reliability are lacking because there is a risk that the mortar deteriorates with long-term laying or the mortar is peeled off and detached when the construction is not performed properly. In addition, once installed, it cannot be easily detached, and there is a problem that the maintenance of the rail is difficult.

  The prior art 2 has a structure in which a pair of soundproof materials are fastened to a rail by a pair of fastening screws. For this reason, if the soundproofing material is made thick in order to enhance the soundproofing effect, the weight increases, so that there is a problem that the soundproofing material cannot be firmly fixed to the rail with the fastening screw. In addition, in this prior art 2, in order to ensure a certain level of safety and reliability, the structure is generally large and not only the construction becomes difficult, but also when removing this structure and maintaining the rails There was a problem that the process became complicated.

  In the prior art 3, the magnetic rubber is fixed to the rail using the magnetic force attracting force. However, with this measure alone, there is a risk that a part or all of the rail will fall off due to the large vibration of the rail excited when the vehicle travels. The Therefore, it is necessary to use measures to fix from the outside of the soundproofing material using a jig etc., but in that case, the advantage of this technology that can be easily constructed using the magnetic adsorption force of magnetic rubber is significantly impaired. It will be. At the same time, when removing the material and maintaining the rail, complicated work is required, and the merit of easy maintenance of the material is also lost.

  The problem of the present invention is that it can be easily constructed by fixing a soundproof material to the support body, and can be easily removed and maintained easily at the time of rail maintenance, and the railings can be secured by firmly fixing the soundproof material to the support body. It is intended to provide a soundproof structure for a rail that can prevent the separation from the vehicle and can improve safety and reliability to a high degree.

The present invention solves the above-mentioned problems by the solving means described below.
In addition, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this embodiment.
The invention according to claim 1 is a soundproof structure for a rail that reduces noise generated by vibration of the rail (R), and a support body that supports the rail with a soundproof material (4) that reduces noise generated from the rail. (1) A detachable fixing member (7; 10, 11) is provided, and the soundproof material has a soft elastic material (5) that absorbs the noise on a side in contact with the rail, and the rail The hard elastic material (6) for suppressing the vibration is provided on the opposite side to the side in contact with the soft elastic material, and the soft elastic material is a foam of EPDM that is a viscoelastic material having a sound absorbing function, and the hard elastic material Is a damping structure (3) for a rail, characterized in that it is a damping steel plate having a higher rigidity than the soft elastic material and having a damping function.

  According to a second aspect of the present invention, in the rail soundproof structure according to the first aspect, when the fixing member (7) is a sleeper that supports the rail continuously in a length direction, A soundproof structure for a rail, wherein the soundproof material is detachably fixed to the sleeper.

  According to a third aspect of the present invention, in the soundproof structure for a rail according to the first aspect, the fixing member (10, 11) is a sleeper in which the support body supports the rail at a predetermined interval in the length direction. The soundproofing structure for the rail is characterized in that the soundproofing material is detachably fixed to the sleeper.

  According to a fourth aspect of the present invention, in the soundproof structure for a rail according to the first aspect, when the support member is a track slab, the fixing member (7) removably fixes the soundproof material to the track slab. It is the soundproof structure of the rail characterized by doing.

  According to the present invention, it can be easily constructed by fixing the soundproof material to the support body, and can be easily removed and maintained easily during the maintenance of the rail, and it can be easily removed from the rail by firmly fixing the soundproof material to the support body. Can be prevented, and safety and reliability can be improved to a high degree.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a perspective view showing a mounted state of a rail soundproof structure according to the first embodiment of the present invention. FIG. 2 is a plan view showing a mounted state of the rail soundproof structure according to the first embodiment of the present invention. FIG. 3 is a side view showing a mounted state of the rail soundproof structure according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing a state cut along line IV-IV in FIG.

The rail R shown in FIGS. 1 to 4 is a member that supports and guides the wheels W of the railway vehicle to run the railway vehicle. The rail R is a rail head portion R ₁ that contacts the wheel W of the railway vehicle, a rail bottom portion (flange portion) R ₂ that is attached to the support 1, and a rail abdomen that connects the rail head portion R ₁ and the rail bottom portion R _2. and a (web portion) R _3. The wheel W shown in FIG. 4 is a member that is in rotational contact with the rail R, and is continuously formed on the tread surface W ₁ that contacts the top surface of the rail head portion R ₁ and receives frictional resistance, and the outer periphery of the wheel W. and and a flange surface W _2.

  The support body 1 shown in FIGS. 1-4 is a member which supports the rail R. As shown in FIG. The support body 1 has a function of accurately maintaining an interval (gauge) between the left and right rails R and distributing the train load transmitted from the rails R to the roadbed. The support body 1 is a vertical sleeper that supports the rail R continuously in the length direction and is laid along the length direction of the rail R. A support body 1 shown in FIGS. 1 to 4 includes a ladder-like structure including a vertical beam 1a of a prestressed concrete structure (PRC structure) that supports the rail R and a steel pipe joint 1b that connects the left and right vertical beams 1a. The ladder sleeper.

The rail fastening device 2 shown in FIGS. 1 to 3 is a device for fastening the rail R to the support 1. 1 to 3, the rail fastening device 2 includes a tie plate 2a that is inserted between the rail R and the support body 1 to restrict lateral movement of the rail R, and the rail R and the tie plate 2a. A track pad 2b that is inserted between the rail pad 2b to relieve the impact during train travel, a clip 2c that presses against the upper surface of the rail bottom R ₂ and fastens to the support 1, a top surface of the rail bottom R ₂ and a clip 2c An insulating material 2d sandwiched between them to electrically insulate them, a fastening bolt 2e that meshes with a female screw portion of an embedding plug embedded in the support 1, and fixes the tie plate 2a to the support 1, A fastening nut 2f fastened to the fastening bolt 2e and a washer 2g inserted between the fastening nut 2f and the tie plate 2a are provided.

  The soundproof structure 3 is a structure that reduces noise generated by vibration of the rail R. As shown in FIGS. 1 to 4, the soundproof structure 3 includes a soundproof material 4 and a fixing member 7. The soundproof structure 3 suppresses noise generated when the vehicle passes on the rail R and suppresses noise from the rail R.

The soundproofing material 4 is a member that reduces noise generated from the rail R. As shown in FIG. 4, the soundproofing material 4 is a member that covers the top and side surfaces of the rail bottom R ₂ and the rail abdomen R ₃ , and includes a soft elastic material 5 and a hard elastic material 6 that cover a part of the rail R. It has. The soundproof material 4 is formed in a shape along these surface shapes so as to be in close contact with the upper and side surfaces of the rail bottom R ₂ and the rail abdomen R _3, and the soft elastic material 5 is provided on the side in contact with the rail R. The hard elastic material 6 is provided on the side opposite to the side in contact with the rail R (the back surface of the soft elastic material 5). The soundproof material 4 can be detachably mounted from the left and right sides of the rail R so as to sandwich the rail R, and the soft elastic material 5 and the hard elastic material 6 are integrally formed. As shown in FIGS. 1 to 3, the soundproof material 4 is formed to have substantially the same length as the installation interval of the rail fastening device 2 in the length direction of the rail R. The soundproofing material 4 covers the upper and side surfaces of the rail bottom R ₂ and the rail abdomen R ₃ so as to exhibit a noise reduction effect as much as possible. As shown in FIGS. 2 and 3, the soundproof material 4 is formed with notches 4 a at both ends in the length direction. The notch 4a is an escape portion that prevents interference with the rail fastening device 2, and a gap is provided between the rail fastening device 2 and the soundproofing material 4 so as to electrically insulate the rail fastening device 2 and the soundproofing material 4. Forming part.

The soft elastic material 5 shown in FIG. 4 is an elastic body having lower rigidity than the hard elastic material 6. The soft elastic material 5 is an elastic body that is relatively softer than a rigid body, and has, for example, a Young's modulus of 1.0 × 10 ³ MPa or less at room temperature, and preferably also has viscosity. The loss factor, which is one of the indices for evaluating the above, is 0.05 or more, and the thickness is 1 to 500 mm (desirably 10 to 30 mm in the case of a viscoelastic material). Such materials include natural rubber, styrene butadiene rubber, butyl rubber, ethylene propylene rubber (EPDM), chloroprene rubber, fluorine rubber, silicon rubber, urethane rubber, polynorbornene rubber, vulcanized rubber such as acrylic rubber, styrene, Thermoplastic resins such as olefin rubber, vinyl chloride TPE (thermoplastic elastomer), polystyrene, polyethylene, polypropylene, vinyl chloride, ethylene vinyl acetate copolymer (EVA) resin, silicone gel, vinyl acetate, EVA In addition, emulsions such as acrylic resin, rubber latex and the like can be applied. In addition, the soft elastic material 5 may be a material having a sound absorbing function for absorbing noise from the rail R. Examples of such a sound absorbing material include a flexible elastic material and a flexible viscoelastic material. As the flexible elastic material, a fiber body made of a thermoplastic resin such as polyethylene or polypropylene, rock wool, glass wool or the like is preferable. As the flexible viscoelastic material, foams such as urethane, EPDM, and chloroprene are preferable. Since such foams are viscoelastic bodies having a sound absorbing and damping function, it is possible to expect a damping effect as well as a sound absorbing effect. it can.

The hard elastic material 6 is an elastic body having higher rigidity than the soft elastic material 5. The hard elastic material 6 is formed of, for example, a rigid elastic body (high rigidity elastic body) made of a metal or a rigid body having a Young's modulus of 3.0 × 10 ³ MPa or more. The hard elastic material 6 is formed of a damping material having a damping function for suppressing vibration of the rail R. As such a damping material, a thin plate-shaped resin laminated damping steel plate made of a rubber layer and a metal plate (metal laminate (name of product) manufactured by NICHIAS Co., Ltd.), a dumpling manufactured by Kobe Steel (tablet) Product name)), steel-based damping alloys containing chromium, lead, etc., aluminum-based damping alloys containing zinc, etc., and asphalt-based, acrylic-based, chloroprene-based vibration-damping paints The metal plate etc. which were made are preferable. As shown in FIG. 4, the hard elastic material 6 prevents the soft elastic material 5 from being exposed to direct sunlight and suppresses deterioration due to ultraviolet rays. A slight gap is formed between the upper end portion of the hard elastic member 6 and the rail R so as to be electrically insulated from the rail R. The hard elastic material 6 is attached and fixed to the surface of the soft elastic material 5 opposite to the side in contact with the rail R with an adhesive or the like. The hard elastic material 6 includes a fixing portion 6a as shown in FIGS.

  1-4 is a part fixed to the support body 1. As shown in FIG. As shown in FIGS. 1 to 3, the fixing portion 6 a is a flat plate-like portion formed along the lower edge in the length direction of the hard elastic material 6. As shown in FIG. 4, the fixing portion 6 a is formed with a through hole 6 b that penetrates the fixing portion 6 a with an interval in the length direction of the fixing portion 6 a.

  The fixing member 7 is a member that detachably fixes the soundproof material 4 to the support 1. As shown in FIG. 4, the fixing member 7 includes an embedded plug 7a, a fastening bolt 7b, a fastening nut 7c, a washer 7d, an insulating material 7e, and the like. The embedded plug 7a is a member embedded in the support body 1 in order to fasten the fastening bolt 7b. The embedded plug 7a is an unsaturated polyester resin or nylon receiving plug that electrically insulates the rail R and the support 1 and has an internal thread portion formed on the inner peripheral portion of the embedded plug 7a. . The fastening bolt 7b is a member that meshes with the female thread portion of the embedded plug 7a and fixes the fixing portion 6a of the soundproof material 4. The fastening nut 7c is a member that is attached to the fastening bolt 7b and presses and fixes the fixing portion 6a against the support 1, and the washer 7d is a member that is sandwiched between the fastening nut 7c and the fixing portion 6a. The insulating material 7e is a member that electrically insulates between the fixed portion 6a and the support 1, and is a plate-shaped member made of vulcanized rubber, urethane, or plastic. As shown in FIG. 3, the insulating material 7e is inserted at a predetermined interval along the length direction of the rail R, and a through hole 7f through which the fastening bolt 7b passes is formed in the insulating material 7e. Yes.

Next, the operation of the soundproof structure for rails according to the first embodiment of the present invention will be described.
When the vehicle passes over the rail R and the rail R vibrates, the soft elastic material 5 tries to vibrate together with the rail R. When the soft elastic material 5 is formed of a flexible elastic material, a flexible spring having a small spring constant is configured as a dynamic model. As a result, the vibration transmissibility decreases due to a decrease in the spring constant, and the vibration from the rail R hardly propagates to the hard elastic material 6. On the other hand, when the soft elastic material 5 is formed of a flexible viscoelastic material, a flexible spring and an attenuator (dashpot) are configured as a dynamic model. For this reason, the vibration transmissibility decreases due to the decrease in the spring constant, and part of the vibration energy of the rail R is converted into thermal energy by the vibration attenuation due to the viscosity, and the vibration of the rail R is absorbed and attenuated. As a result, since the vibration propagating from the rail R to the hard elastic material 6 of the outer layer is reduced, the vibration of the hard elastic material 6 is reduced and the radiated sound from the hard elastic material 6 is reduced. In particular, when a soft viscoelastic material is constrained by the hard elastic material 6, the degree of shear deformation of the soft elastic material 5 is increased during vibration, so that the internal loss of the viscoelastic material increases and the damping capacity is increased. Amplified. Moreover, since the substantially entire surface of the rail R is covered with the hard elastic material 6, the acoustic impedance of the radiated sound from the hard elastic material 6 is reduced, the radiated sound power of the rail R itself is reduced, and the soundproofing effect is improved. . Furthermore, since the noise generated from the rail R is reduced, the reflected sound reflected by the support 1 is also reduced.

Next, a method for mounting the soundproof structure for rails according to the first embodiment of the present invention will be described.
As shown in FIG. 4, the soundproofing material 4 is attached to the left and right of the rail R, and the insulating material 7 e is sandwiched between the fixing portion 6 a of the hard elastic material 6 and the support 1. Next, the fastening bolt 7b is inserted into the through holes 6b and 7f and screwed into the embedded plug 7a, the washer 7d is attached to the fastening bolt 7b, and the fastening nut 7c is attached to the fastening bolt 7b and tightened. As a result, the upper and side surfaces of the rail bottom R ₂ and the rail abdomen R ₃ are covered with the soundproof material 4, and the soundproof material 4 is firmly fixed to the support 1 by the fixing member 7. When exchanging or inspecting the rail R, the soundproof material 4 is removed from the rail R by a procedure reverse to the procedure described above.

The rail soundproof structure according to the first embodiment of the present invention has the following effects.
(1) In the first embodiment, the fixing member 7 is detachably fixed to the support 1 with the soundproofing material 4 for reducing the noise generated from the rail R. For this reason, while being able to fix the soundproof material 4 to the support body 1 easily, the attachment operation | work of the soundproof material 4 becomes easy and workability | operativity can be improved. Moreover, since the conventional soundproof structure of the rail is a structure in which the soundproof material is fixed independently without using a ground laying object, it is necessary to insert and fix a metal fitting or the like after the soundproof material is attached to the rail. On the other hand, in the first embodiment, after the soundproof material 4 is mounted on the rail R, the soundproof material 4 is fixed using a ground laying material such as the support 1. For this reason, the construction of the soundproof material 4 is simplified and the removal of the soundproof material 4 is also simplified, and the rail R can be easily maintained.

(2) In the first embodiment, the soundproof material 4 is firmly fixed to the support 1. For this reason, the risk of falling off the soundproofing material 4 is reduced, and safety and reliability can be improved. Further, in the first embodiment, soundproofing material 4 covers the lower from the point of constant height of the rail abdomen R ₃ together with the support member 1. For this reason, a sound insulation wall is partially formed on the support body 1, and in particular, it is possible to prevent the radiated sound generated from the lower part of the rail R from propagating along the line and improve the sound insulation effect. Furthermore, in the first embodiment, the soundproof material 4 is fixed to the support 1 using the support 1. For this reason, the freedom degree of the soundproof structure 3 can be improved. For example, a curved, complicated shape or structure of a soundproofing material that is difficult to fix by a conventional rail soundproofing structure can be easily fixed to the support 1 and applied. As a result, the soundproof material 4 having an arbitrary position, thickness, and shape can be applied within the constraints on the physical space of the track and the constraints on the acoustic effect.

(3) In the first embodiment, the fixing member 7 is detachably fixed to the support 1 that continuously supports the rail R in the length direction. For this reason, the soundproof material 4 can be continuously and firmly fixed to the support body 1 by the fixing member 7 along the length direction of the support body 1.

(Second Embodiment)
FIG. 5 is a perspective view showing a mounted state of a rail soundproof structure according to the second embodiment of the present invention. FIG. 6 is a plan view showing a mounted state of a rail soundproof structure according to the second embodiment of the present invention. FIG. 7: is a side view which shows the mounting state of the soundproof structure of the rail which concerns on 2nd Embodiment of this invention. 8 is a cross-sectional view showing a state cut along line VIII-VIII in FIG. 9 is a cross-sectional view showing a state cut along line IX-IX in FIG. In the following, the same parts as those shown in FIGS. 1 to 4 are denoted by the same reference numerals and detailed description thereof is omitted.

  The support body 1 shown in FIGS. 5 to 9 is disposed with a predetermined interval in the length direction of the rail R, and supports the rail R discretely in a direction intersecting with the rail R. As shown in FIG. 5, the support 1 is a horizontal sleeper (parallel sleeper used in a general section) laid side by side with respect to the rail R, and is a prestressed concrete sleeper (PC sleeper) Etc.

The soundproof structure 3 shown in FIGS. 5 to 9 includes a soundproof material 4, holding members 8 a and 8 b, a connecting member 9, fixing members 10 and 11, and the like. Deadening 4 is a member that covers substantially the whole surface of the rail bottom R ₂ and rail abdominal R _3, so as to be in close contact with the rail bottom R ₂ and rail abdominal R ₃ is formed in a shape along the surface geometry of the film Yes. As shown in FIGS. 5 to 7, the soundproof material 4 is formed to have substantially the same length as the installation interval of the rail fastening device 2 in the length direction of the rail R so that the bottom surface of the rail bottom R ₂ can be covered. ing.

  The holding members 8 a and 8 b are members that hold the soundproof material 4. The holding members 8a and 8b are formed in a shape along these surface shapes so as to be in close contact with the soundproof material 4, and can be detachably mounted from the left and right side surfaces of the rail R so as to sandwich the soundproof material 4. is there. The holding members 8a and 8b are formed of, for example, a thin plate-like doubly plated steel plate or a stainless steel plate. As shown in FIG. 9, the holding member 8a has a joint 8c and a through hole 8e at one end, and the holding member 8b has a joint 8d and a through hole 8f at one end. Is formed.

  The connecting member 9 is a member that detachably connects the holding member 8a and the holding member 8b. As shown in FIGS. 5, 6, and 9, the connecting member 9 is positioned on the side of the rail R when the soundproof material 4 is mounted on the rail R so that the connecting work can be easily performed. Are arranged as follows. The connecting member 9 includes a bolt 9a inserted into the through holes 8e and 8f, a nut 9b attached to the bolt 9a, and the like.

  The fixing members 10 and 11 are members that fix the soundproof material 4 to the support 1. The fixing member 10 is formed in a shape along these surface shapes so as to be in close contact with the soundproofing material 4, and can be detachably mounted from the left and right side surfaces of the rail R so as to sandwich the soundproofing material 4. As shown in FIGS. 5 and 6, the fixing member 10 is a plate-like member having an approximately L-shaped appearance, and includes a pressing portion 10 a, a bent portion 10 b, a fixing portion 10 c, and the like. The fixing member 10 is formed of, for example, a thin plate-like bump-plated steel plate or a stainless steel plate, and is disposed at both ends in the length direction of the soundproof material 4 as shown in FIGS.

  5 to 8 is a portion that presses the soundproofing material 4. As shown in FIGS. 5 and 8, the pressing portion 10a is formed by curving one end side of the fixing member 10 so as to press the sound insulating material 4 toward the rail R side. 4 is formed in a shape along these surface shapes so as to be in close contact with the surface. The bent portion 10 b is a portion that prevents interference with the rail fastening device 2. As shown in FIG. 5, the bent portion 10 b is bent at a right angle so as to avoid the rail fastening device 2. The fixing portion 10 c is a portion that is fixed to the support 1. As shown in FIGS. 5 and 6, the fixing portion 10 c is formed in a flat plate shape at the end of the fixing member 10 opposite to the pressing portion 10 a. As shown in FIG. 8, the fixing portion 10c is formed with a through hole 10d that penetrates the fixing portion 10c.

  As shown in FIG. 8, the fixing member 11 includes an embedded plug 11a, a fastening bolt 11b, a fastening nut 11c, a washer 11d, an insulating material 11e, and the like. The embedded plug 11a is a member embedded in the support 1 in order to fasten the fastening bolt 11b. The embedded plug 11a is a receptacle made of unsaturated polyester resin or nylon that electrically insulates the rail R and the support 1, and a female screw portion is formed on the inner peripheral portion of the embedded plug 11a. . The fastening bolt 11b is a member that meshes with the female screw portion of the embedded plug 11a and fixes the fixing portion 10c of the fixing member 10. The fastening nut 11 c is a member that is attached to the fastening bolt 11 b and presses the fixing portion 10 c against the support 1 to tighten it. The washer 11d is a member that is sandwiched between the fastening nut 11c and the fixing portion 10c. The insulating material 11e is a member that electrically insulates between the fixed portion 10c and the support 1, and is a plate-shaped member made of vulcanized rubber, urethane, or plastic. A through hole 11f through which the fastening bolt 11b passes is formed in the insulating material 11e.

Next, a method for mounting a soundproof structure for rails according to a second embodiment of the present invention will be described.
As shown in FIGS. 5 to 9, after mounting the soundproof material 4 on both side surfaces of the rail R, the holding members 8 a and 8 b are mounted on the soundproof material 4. Next, as shown in FIG. 9, after inserting the bolt 9a into the through holes 8e and 8f and attaching the nut 9b to the bolt 9a, the nut 9b and the bolt 9a are fastened, and the holding member 8a and the holding member 8b are connected. Link. As shown in FIGS. 5 to 8, the insulating material 11 e is sandwiched between the fixing portion 10 c of the fixing member 10 and the support 1 in a state where the pressing portion 10 a of the fixing member 10 is in contact with the soundproof material 4. Next, as shown in FIG. 8, the fastening bolt 11b is inserted into the through holes 10d and 11f, screwed into the embedded plug 11a, the washer 11d is attached to the fastening bolt 11b, and the fastening nut 11c is attached to the fastening bolt 11b. tighten. As a result, the rail bottom R ₂ and the rail abdomen R ₃ are covered with the soundproofing material 4, and the soundproofing material 4 is fixed to the support 1 with the soundproofing material 4 held on the rail R by the holding members 8 a and 8 b. , 11. When exchanging or inspecting the rail R, the soundproof material 4 is removed from the rail R by a procedure reverse to the procedure described above.

In the second embodiment of the present invention, in addition to the effects of the first embodiment, not only the upper and side surfaces of the rail bottom portion R ₂ and the rail belly portion R ₃ but also the lower surface of the rail bottom portion R ₂ are covered with the soundproof material 4. Thus, the soundproofing material 4 can be firmly fixed to the support 1. For this reason, the risk of the soundproofing material 4 dropping off is reduced, and safety and reliability can be improved.

(Third embodiment)
FIG. 10 is a perspective view showing a mounted state of a rail soundproof structure according to the third embodiment of the present invention.
A support 1 shown in FIG. 10 is a track slab that is a kind of labor-saving track in which a roadbed and a sleeper are integrated. The support body 1 is configured by a rectangular plate-like precast concrete plate (slab plate) in order to reduce maintenance work for a general roadbed track using a roadbed ballast and sleepers. The soundproof material 4 is detachably fixed to the support 1 by a fixing member 7. The third embodiment of the present invention has the same effect as the first embodiment.

(Fourth embodiment)
FIG. 11 is a cross-sectional view of a soundproof structure for rails according to a fourth embodiment of the present invention.
The support 1 shown in FIG. 11 is a ladder sleeper or a track slab. The soundproofing material 4 covers these so as to form a gap (space) S between the top and side surfaces of the rail bottom R ₂ and the rail abdomen R ₃ . In this fourth embodiment, the vibration damping effect on the rail R expected in the first to third embodiments cannot be expected, but the rail bottom R ₂ and the rail abdomen R ₃ are separated by the soundproof material 4. S is covered through. For this reason, the sound insulation material 4 has a structure in which the lower part of the rail abdominal part R ₃ is insulated from the lower part of the rail abdomen R ₃ together with the support body 1, and in particular, the sound generated from the lower part of the rail R is prevented from propagating along the line. Can be improved. Moreover, in this 4th Embodiment, the noise reduction effect can be heightened by using a sound-absorbing material for the soft elastic material 5. Further, in the fourth embodiment, in addition to the above-described effects, rainwater and the like that have entered between the soft elastic material 5 and the rail R are discharged through the gap portion S, so that drainage is improved and galvanic corrosion, etc. Can be prevented.

(Other embodiments)
The present invention is not limited to the embodiment described above, and various modifications or changes can be made as described below, and these are also within the scope of the present invention.
(1) In this embodiment, the case where substantially the entire surface of the rail bottom portion R ₂ and the rail abdominal portion R ₃ is covered with the soundproofing material 4 has been described as an example, but it is in contact with the tread surface W ₁ and the flange surface W _{2 of the} wheel W. A part of the rail head R ₁ can also be covered with the soundproofing material 4 within the range not to be used. Moreover, in this embodiment, although the case where it covered with the soundproof material 4 except the part which interferes with the support body 1 and the rail fastening apparatus 2 was mentioned as an example, the rail joint board which connects the rail R is electrically insulated. It can also be covered with a soundproofing material where possible.

(2) In this embodiment, the fastening mechanisms 7 and 11 have been described by taking the fastening mechanism as an example. However, these fastening mechanisms are only examples and are not limited to these fastening mechanisms. Any method may be used as long as it can be mechanically fixed to 1. Further, in this embodiment, the fastening members 7 and 11 have been described using the fastening mechanism as an example, but the soundproofing material 4 can also be fixed to the support 1 with an adhesive such as an organic material adhesive or mortar. Furthermore, in this embodiment, the case where the fixing members 7 and 11 are installed on the existing track has been described as an example, but the fixing members 7 and 11 can also be installed on the new track. For example, a bolt hole may be provided at an appropriate position of the support 1 in the manufacturing process of the support 1 manufacturing factory, and the soundproof material 4 may be applied using the bolt hole at the time of track construction.

(3) In this embodiment, the case where the hard elastic member 6 and the fixing member 10 are separate members has been described as an example, but these members can be integrated. Moreover, in this embodiment, the case where the insulating material 7e was inserted between the support body 1 and the soundproof material 4 and the insulating material 11e was inserted between the support body 1 and the fixing member 10 was described as an example. However, if sufficient insulation can be achieved, the insulating materials 7e and 11e can be omitted.

It is a perspective view which shows the mounting state of the soundproof structure of the rail which concerns on 1st Embodiment of this invention. It is a top view which shows the mounting state of the soundproof structure of the rail which concerns on 1st Embodiment of this invention. It is a side view which shows the mounting state of the soundproof structure of the rail which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the state cut | disconnected by the IV-IV line of FIG. It is a perspective view which shows the mounting state of the soundproof structure of the rail which concerns on 2nd Embodiment of this invention. It is a top view which shows the mounting state of the soundproof structure of the rail which concerns on 2nd Embodiment of this invention. It is a side view which shows the mounting state of the soundproof structure of the rail which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the state cut | disconnected by the VIII-VIII line of FIG. It is sectional drawing which shows the state cut | disconnected by the IX-IX line of FIG. It is a perspective view which shows the mounting state of the soundproof structure of the rail which concerns on 3rd Embodiment of this invention. It is sectional drawing of the soundproof structure of the rail which concerns on 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Support body 2 Rail fastening apparatus 3 Soundproof structure 4 Soundproof material 5 Soft elastic material 6 Hard elastic material 7 Fixing member 8a, 8b Holding member 9 Connecting member 10,11 Fixing member R Rail W Wheel S Gap part

Claims (4)

A soundproof structure for the rail that reduces the noise generated by the vibration of the rail,
A fixing member that detachably fixes a soundproofing material that reduces noise generated from the rail to a support that supports the rail;
The soundproof material has a soft elastic material that absorbs the noise on the side in contact with the rail, and has a hard elastic material to suppress the vibration on the side opposite to the side in contact with the rail,
The soft elastic material is a foam of EPDM which is a viscoelastic material having a sound absorbing function,
The hard elastic material is a vibration-damping steel plate having a higher vibration damping function than the soft elastic material;
The soundproof structure of the rail characterized by. In the soundproof structure of the rail according to claim 1,
When the support member is a sleeper that continuously supports the rail in the length direction, the fixing member is detachably fixed to the sleeper.
The soundproof structure of the rail characterized by. In the soundproof structure of the rail according to claim 1,
When the support member is a sleeper that supports the rail at a predetermined interval in the length direction, the fixing member is detachably fixed to the sleeper.
The soundproof structure of the rail characterized by. In the soundproof structure of the rail according to claim 1,
The fixing member is detachably fixing the soundproof material to the track slab when the support is a track slab;
The soundproof structure of the rail characterized by.

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