KR20170038255A

KR20170038255A - Railroad wheels noise barriers

Info

Publication number: KR20170038255A
Application number: KR1020150137354A
Authority: KR
Inventors: 이동훈; 양윤상
Original assignee: 서울과학기술대학교 산학협력단
Priority date: 2015-09-30
Filing date: 2015-09-30
Publication date: 2017-04-07
Also published as: KR101781266B1

Abstract

Disclosed is a railroad wheel noise barrier. The railroad wheel noise barrier blocks noise produced between wheels and rails while a train runs, comprising: a first noise barrier arranged to face a first rail among the two rails; and a second noise barrier arranged to face a second rail among the two rails. The first and the second noise barrier are formed by stacking soundproof members including a noise blocking member having an internal space to allow noise produced between the wheels and the rails to enter, and a noise guide member arranged in front of the noise blocking member to guide the noise to move towards the noise blocking member in a plurality of layers. The soundproof members are arranged in a prescribed pattern to adjust a distance of the noise guide member to the two rails in each layer when arranged in a height direction of the first and the second noise barrier to form each layer of the first and the second noise barrier.

Description

{RAILROAD WHEELS NOISE BARRIERS}

The present invention relates to a railway wheel sound barrier, and more particularly to a railway wheel sound barrier having excellent noise reduction performance.

Generally, the rail is provided with a pair of rails so as to correspond to each other on a fixed plate fixed to both sides of the sleeper along the route so that the railroad car can be operated.

Particularly, a railway which is widely used as an onshore transportation means capable of mass transportation, unlike other land transportation means, the wheels of a railway vehicle are made of steel, and the weight thereof is remarkably larger than that of other land transportation means, , There is a problem in that the railroad vehicle is subjected to a lot of noise due to friction and impact between the rail and the wheel when traveling on the track, thereby causing many inconveniences and discomfort to residents and living citizens living near the railroad.

Furthermore, even though the train is slowing down to reduce the noise when the user enters the platform waiting for boarding or passes through the city center, the noise caused by the friction and impact of the wheel and the rail, There were problems such as giving inconvenience and discomfort to residents and visitors using the train.

Korean Patent No. 10-0748441

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a railway wheel sound barrier which is capable of suppressing radiation and reducing noise at the lower portion of a train and increasing the efficiency of environmentally friendly design.

A railway road noise barrier according to an embodiment of the present invention is a railway road noise barrier for blocking noise generated between a wheel and a rail during operation of a train, the railway road noise barrier wall comprising a first soundproof wall facing the first rail of the two rails; And a second soundproof wall disposed to face the second one of the two rails, wherein the first soundproof wall and the second soundproof wall are configured to have an internal space capable of introducing noise generated between the wheel and the rail, And a soundproofing member disposed in front of the blocking member and the noise shielding member and including a noise inducing member for guiding the noise to move toward the noise shielding member are stacked in a multilayer structure, And the noise inducing member is arranged in a predetermined pattern in which the distance between the noise inducing member and the two rails is adjusted in each layer when arranged in the height direction of the first soundproof wall and the second soundproof wall to form each layer of the two soundproof walls.

In one embodiment, the pattern in which the soundproofing members are arranged is such that the noise guide member is closer to the two rails from the center of the first soundproof wall and the second soundproof wall toward the upper end and the lower end of the first soundproof wall and the second soundproof wall . &Lt; / RTI >

In another embodiment, the pattern in which the soundproofing member is arranged may be arranged such that the noise inducing member is positioned closer to the two rails from the lower end to the upper end of the first soundproof wall and the second soundproof wall.

In another embodiment, the pattern in which the soundproofing members are arranged is characterized in that the soundproofing members of the soundproofing members of the respective layers of the first soundproof wall and the second soundproof wall are adjacent to the two rails at the same distance, As shown in Fig.

The noise shielding member is arranged in a plurality of lengthwise directions of the two rails and is stacked in a height direction of the first soundproof wall and the second soundproof wall and has a noise inflow space formed therein, A main chamber which is introduced into the space and is reduced; A plurality of perforated plates arranged in a noise inflow space of the main chamber and having a plurality of noise inflow holes formed therein so as to reduce noise while gradually passing through the noise inflow space of the main chamber; And slots formed on both sides of the main chamber along the longitudinal direction so that both sides of the perforated plates are slidably engaged with each other.

A plurality of noise inlet holes are formed in order to allow external noise to flow into the noise inlet space of the main chamber, and the sound inlet holes may be formed such that the perforated plate has a porosity of 1 to 10%.

The noise inlet holes may be narrower than the inlet and the cross sectional area ratio of the beginning of the inlet to the end of the outlet may be 1: 1.2 to 1: 5.

The perforated plate may be provided such that the cross-sectional shape is bent in the "" shape to increase the surface area.

Wherein the noise guide member includes: a plate portion positioned in front of the noise blocking member; A plurality of noise inducing parts formed on the plate part to reduce the flow resistance and guide the noise between the wheels and the rail of the train toward the noise shielding member; The noise inducing unit includes a first noise inducing surface formed at one side of the inner surface of the plate portion to be perpendicular to the outer surface of the plate portion, a second noise inducing surface formed obliquely to the outer surface of the plate portion and inclined downward toward the vertical surface, A third noise inducing surface formed between the surface and the outer surface of the plate portion so as to guide the flowing air struck against the second noise inducing surface to flow to the outer surface side of the plate portion without vortexes and a third noise inducing surface between the first noise inducing surface and the second noise inducing surface end And a noise passage hole through which noise induced along the second noise induction surface is passed; The angle? Formed by the first noise inducing surface and the second noise inducing surface is 15 to 60 mm; The flow air generated by the running of the vehicle can be arranged to pass over the third noise inducing surface after hitting the second noise inducing surface.

Wherein the noise passage hole has a width d of 0.1 to 5 mm and a width D of 2 to 10 mm and an area occupied by the noise passage hole 224 of 0.1 to 0.5 mm, Is 0.1 to 2 mm, and the aperture ratio of the noise passing hole may be 0.1 to 3.0% per m.

Wherein the noise inducing member has an acute portion formed at a lower end portion thereof, and the acute portion is formed by forming a tool vertical surface and a tool inclined surface at an angle? Of 15 to 60 degrees; A plate preparing step of preparing a plate having a thickness (T) of 0.1 to 2 mm; A setting step of setting the plate after loading the plate under the press; A punching step of punching the set plate with a manufacturing tool to form a first noise inducing surface, a second noise inducing surface, and a noise passing hole in the plate; A transfer step of transferring the punched plate to the next process; And checking whether the transferred plate is defective or not.

Wherein the noise inducing member has a length d of 0.1 to 5 mm, a length D of 2 to 10 mm and a total area of the noise passing hole of 0.1 to 0.5 mm in the punching step And can be manufactured by punching.

According to the railway wheel sound barrier according to the present invention, noise is reduced in the entire frequency band of the noise, and noise is installed close to the wheels and bogies of the train so that the radiation suppression and the noise reduction efficiency are improved in the lower portion of the train , Because it does not use chemical noise reduction materials, it is possible to design and use environmentally friendly.

1 is a front view schematically showing the structure of a railway wheel sound barrier according to an embodiment of the present invention.
2A and 2B are views illustrating a first embodiment of a pattern in which a soundproofing member is arranged.
3A, 3B and 3C are views illustrating a second embodiment of a pattern in which the soundproofing members are arranged.
4 is a view illustrating a fourth embodiment of a pattern in which the soundproofing members are arranged.
5 is a schematic perspective view showing a sound barrier member of a soundproof member of a railway road noise barrier of the present invention.
6 is a schematic plan view showing another embodiment of the perforated plate of the noise blocking member.
7 is a schematic partial perspective view showing a noise inducing member used in the railway wheel sound barrier of the present invention.
8 is a bottom perspective view of Fig. 7. Fig.
Fig. 9 is a plan view of Fig. 7. Fig.
10 is a partial cutaway perspective view of FIG.
11 is a side sectional view of Fig.
FIG. 12 is a schematic partial cross-sectional view showing a state where the noise inducing member shown in FIG. 7 is installed on a noise shielding member.
FIG. 13 is a partially enlarged cross-sectional side view showing a state in which a noise inducing part is formed on a noise inducing member by a manufacturing tool used for manufacturing the noise inducing member shown in FIG.
14 is a flowchart showing a manufacturing method of the noise inducing member shown in FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a railway road noise barrier according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is capable of various modifications and various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing. In the accompanying drawings, the dimensions of the structures are enlarged to illustrate the present invention in order to clarify the present invention.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a part or a combination thereof is described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a front view schematically showing the structure of a railway wheel sound barrier according to an embodiment of the present invention.

Referring to FIG. 1, a railway road noise barrier wall according to an embodiment of the present invention includes a first sound barrier wall 10 and a second sound barrier wall 20.

The first soundproof wall 10 and the second soundproof wall 20 face the two rails 1, 1 '. For example, the first soundproof wall 10 is disposed to face the first rail 1, and the second soundproof wall 20 is disposed to face the second rail 3.

The first soundproof wall 10 and the second soundproof wall 20 are formed of a soundproofing member 1000 laminated in multiple layers. The soundproofing member 1000 is disposed in front of the noise shielding member 100 and the noise shielding member 100 configured to have an internal space into which noise generated between the wheel and the rail can flow, And a noise inducing member (200) for guiding the sound guide member (200) to move. When the soundproofing member 1000 is arranged in the height direction of the first soundproof wall 10 and the second soundproof wall 20 so as to form respective layers of the first soundproof wall 10 and the second soundproof wall 20, (200) are arranged in a predetermined pattern in which the distance adjacent to the two rails (1, 1 ') is adjusted.

The soundproofing member 1000 is formed from the center of the first soundproof wall 10 and the second soundproof wall 20 so that the first soundproof wall 10 and the second soundproof wall 1000 The noise inducing member 200 may be arranged closer to the two rails 1 and 1 'toward the upper end and the lower end of the noise inducing member 20. Figs. 1, 2A and 2B are views illustrating a first embodiment of a pattern in which a soundproofing member is arranged. Fig.

For example, the pattern in which the soundproofing member 1000 is arranged as shown in FIG. 1 may be a stepped shape. In this case, each of the first sound barrier wall 10 and the second sound barrier wall 20 may be composed of five layers. At this time, the third soundproofing member 1000 located at the center has a first length in which the noise inducing member 200 is located furthest from the two rails 1 and 1 ', and the second floor below the third floor And the soundproofing member 1000 of the fourth layer above the third layer has a second length longer than the first length so that the noise inducing member 200 is closer to the two rails 1, 1 'than the third layer , The sound insulating member (1000) of the first layer below the fifth layer and the second layer above the fourth layer has a structure in which the noise inducing member (200) is sandwiched between two rails (1, 1 ') And may be arranged in a pattern having a third length that is longer than the second length so as to be positioned close to the first length.

As another example, the pattern in which the soundproofing member 1000 is arranged as shown in FIG. 2A may be triangular-symmetrical. In this case, each of the first sound barrier wall 10 and the second sound barrier wall 20 may be composed of six layers. At this time, the sound insulation member 1000 of the third layer and the fourth layer positioned at the center and symmetrical to each other has a first length in which the noise inducing member 200 is located furthest from the two rails 1, 1 ' The soundproofing member 1000 of the fifth layer above the second and fourth layers below the third layer is positioned so that the noise inducing member 200 is positioned closer to the two rails 1, 1 'than the third and fourth layers And the sound insulating member (1000) of the sixth layer above the first layer and the fifth layer below the second layer is closer to the sound inducing member (200) than the second and fifth layers, May be arranged in a pattern having a third length that is longer than the second length so as to be located close to the two rails (1,1 ').

As another example, the pattern in which the soundproofing member 1000 is arranged as shown in FIG. 2B may be an arched shape. In this case, each of the first sound barrier wall 10 and the second sound barrier wall 20 may be composed of six layers. At this time, the sound insulation member 1000 of the third layer and the fourth layer positioned at the center and symmetrical to each other has a first length in which the noise inducing member 200 is located furthest from the two rails 1, 1 ' The soundproofing member 1000 of the fifth layer above the second and fourth layers below the third layer is positioned so that the noise inducing member 200 is positioned closer to the two rails 1, 1 'than the third and fourth layers And the sound insulating member (1000) of the sixth layer above the first layer and the fifth layer below the second layer is closer to the sound inducing member (200) than the second and fifth layers, May be arranged in a pattern having a third length that is longer than the second length so as to be located close to the two rails (1,1 ').

The soundproofing member 1000 may have a structure in which the noise inducing member 200 moves from the lower end of the first soundproof wall 10 and the second soundproof wall 20 to the upper end of the soundproof member 1000, (1, 1 '). &Lt; / RTI > 3A, 3B and 3C are views illustrating a second embodiment of a pattern in which the soundproofing members are arranged.

For example, the pattern in which the soundproofing member 1000 is arranged as shown in FIG. 3A may be inverted triangular. As another example, the pattern in which the soundproofing member 1000 is arranged as shown in FIG. 3B may be inverted pyramidal. As another example, the pattern in which the soundproofing member 1000 is arranged as shown in FIG. 3C may be in a semi-arch shape. 3A to 3C, each of the first soundproof wall 10 and the second soundproof wall 20 may be composed of four layers. At this time, the soundproofing member 1000 of the first layer has a first length where the noise inducing member 200 is located furthest from the two rails 1 and 1 ', and the soundproofing member 1000 of the second layer is the first The soundproofing member 1000 of the third layer has a second length longer than the first length so that the noise inducing member 200 is located closer to the two rails 1 and 1 ' The sound insulation member 1000 of the fourth layer has a third length that is longer than the second length so that the member 200 is positioned adjacent to the two rails 1 and 1 ' May be arranged in a pattern having a fourth length that is longer than the third length so as to be located close to the two rails (1,1 ').

The noise inducing member 200 of the soundproofing member 1000 of each of the layers of the first soundproof wall 10 and the second soundproof wall 20 is divided into two rails 1 , 1 ') with the same distance, but the soundproofing member 1000 can be arranged to be inclined at an angle from the two rails (1, 1'). 4 is a view illustrating a fourth embodiment of a pattern in which the soundproofing members are arranged.

For example, the shape in which the soundproofing member 1000 is arranged as shown in FIG. 4 may be in the form of a blade, and in this case, the soundproofing member 1000 may be a shape in which the area increases as the distance from the two rails 1, 1 ' have.

The height of the first soundproof wall 10 and the second soundproof wall 20 in this illustrated form is higher than the height of the two rails 1 and 1 ' ). &Lt; / RTI >

Hereinafter, the noise shielding member 100 and the noise inducing member 200 of the soundproofing member 1000 constituting the first soundproof wall 10 and the second soundproof wall 20 will be described in detail.

Description of Noise Canceling Member

5 is a schematic perspective view showing a sound barrier member of a soundproofing member of a railway wheel sound barrier of the present invention.

Referring to FIG. 5, the noise blocking member 100 includes a main chamber 110, a perforated plate 120, and slots 130.

In the main chamber 110, a noise inflow space 111 is formed therein, the external noise is introduced into the noise inflow space 111, and the main chamber 110 is reduced in number, and the main chamber 110 can be arranged along the longitudinal direction of the roadway where the soundproof wall is installed.

The perforated plate 120 is arranged in the noise inflow space 111 of the main chamber 110 and the noise introduced into the noise inflow space 111 of the main chamber 110 is gradually passed through the noise inflow space 111 A plurality of noise inlet holes 121 are formed so as to reduce the noise. The perforated plate 120 may be configured to have a width corresponding to the width of the slot 130 and be forced into the slot 130.

The slots 130 are elongated in the longitudinal direction on both sides of the main chamber 110 so that both sides of the perforated plates 120 are slidably engaged.

A plurality of noise inlet holes 121 are formed in the perforated plate 120 to allow external noise to flow into the noise inlet space 111 of the main chamber 110. The noise inlet holes 121 are formed so that the perforated plate 120 has a porosity of 1 to 10%.

If the porosity of the perforated plate 120 is less than 1%, external noise can not flow smoothly into the noise inflow space 111. If the porosity of the perforated plate 120 exceeds 10%, contamination of the interior of the main chamber 110 is increased and rainwater or the like may be introduced into the noise inflow space 111. Therefore, it is preferable that the noise inlet holes 121 are formed in the perforated plate 120 to have a porosity of 1 to 10%.

Further, the noise inlet holes 121 of the perforated plate 120 are narrower than the outlet 121b.

Therefore, when the noise passes through the narrow entrance 121a due to the Venturi effect, the velocity is increased and smoothly flows. Then, while being transferred to the outlet 121b having a large diameter, the flow velocity and the pressure are lowered, thereby canceling the noise.

Sectional area ratio between the beginning of the inlet 121a of the noise inlet hole 121 and the end of the outlet 121b is 1: 1.2 to 1: 5.

When the cross-sectional area ratio between the inlet 121a of the noise inlet hole 121 and the outlet 121b of the noise inlet hole 121 is less than 1: 1.2, the passage difference between the inlet 121a and the outlet 121b is not large, The speed improvement effect is insignificant.

When the area ratio between the inlet 121a and the outlet 121b is more than 1: 5, the inflow speed of the noise is not greatly improved, but the processing is more difficult. Therefore, it is preferable that the area ratio of the inlet 121a to the outlet 121b of the noise inlet holes 121 is maintained at 1: 1.2 to 1: 5.

The use of such a sound barrier member 100 has the following advantages.

First, the external noises gradually pass through the plurality of perforated plates 120 through the noise inlet holes 121 of the perforated plates 120 and enter the noise inlet space 111, do. Thus, effective noise reduction can be achieved.

A plurality of noise inlet holes 121 are formed in the perforated plate 120 of the noise barrier member 100 so that external noise flows into the noise inlet space 111 of the main chamber 110, The inlet holes 121 are formed so that the perforated plate 120 has a porosity of 1 to 10%.

If the porosity of the perforated plate 120 is less than 1%, the external noise can not flow smoothly into the noise inlet space 111. If the porosity of the perforated plate 120 exceeds 10% There is a problem that internal pollution increases and rainwater or the like is introduced into the noise inflow space 111.

Therefore, since the perforated plate 120 of the present invention has the noise inlet holes 121 formed therein to have the optimal porosity, the noise reduction is smooth and the inflow of external pollution and rainwater is minimized.

Third, the noise inlet holes 121 of the present invention have the inlet 121a narrower than the outlet 121b, and the cross-sectional area ratio of the beginning of the inlet 121a to the end of the outlet 121b is 1: 1.2 ~ 1: 5. When the area ratio between the inlet 121a and the outlet 121b is less than 1: 1.2, the difference in passage between the inlet 121a and the outlet 121b is not large, so that the effect of improving the inflow speed of noise is insignificant. When the area ratio between the inlet 121a and the outlet 121b is more than 1: 5, the inflow speed of the noise is not greatly improved, but the processing is difficult.

Accordingly, the present invention maintains an area ratio of the inlet 121a and the outlet 121b of the noise inlet holes 121 from 1: 1.2 to 1: 5, so that the noise reduction effect and noise inlet effect in a wide band can be improved.

6 is a schematic plan view showing another embodiment of the perforated plate of the noise blocking member.

Referring to FIG. 6, the cross-sectional shape of the perforated plate 120 'is bent in the shape of "". Accordingly, the surface area of the perforated plate 120 'is increased, and the noise inlet holes 121' are further formed by the increase of the surface area.

Therefore, the external noise is maximally brought into contact with the surface area of the increased perforated plate 120 ', thereby passing through a greater number of the noise inlet holes 121' than the increased surface area, thereby improving the noise reduction performance accordingly .

Further, since the cross-sectional shape of the perforated plate 120 is bent in the shape of "", the noise struck against the perforated plate 120 'is guided to the center side of the perforated plate 120' without spreading to the outside of the perforated plate 120 ' To remain within the surface area of the perforated plate 120 '.

Therefore, the noise is maximally induced to the noise inlet holes 121 'of the perforated plate 120', so that the noise reduction performance is increased.

Description of noise induction member

FIG. 7 is a schematic partial perspective view showing a noise inducing member used in the railway wheel sound barrier of the present invention, FIG. 8 is a bottom perspective view of FIG. 7, and FIG. 9 is a plan view of FIG. FIG. 10 is a partial cutaway perspective view of FIG. 7, FIG. 11 is a side sectional view of FIG. 7, and FIG. 12 is a schematic partial plan sectional view showing a state where the noise guide member shown in FIG. FIG. 13 is a partially enlarged cross-sectional side view showing a state where a noise inducing member is formed on a noise inducing member by a manufacturing tool used for manufacturing the noise inducing member shown in FIG. 7, FIG. 14 is a cross- It is a flowchart showing the method.

The sound guide member 200 of the railway road noise barrier of the present invention is disposed in front of the noise shielding member 100.

The noise guide member 200 includes a plate portion 210 and a noise guide portion 220.

The plate portion 210 is installed in front of the noise blocking member 100.

A plurality of noise inducing parts 220 are formed on the plate part 210 to reduce the flow resistance and guide noise generated between the rails and the wheels toward the noise shielding member 100.

The noise guide portions 220 include a first noise guide surface 221, a second noise guide surface 222, a third noise guide surface 223, and a noise passage hole 224. The first noise induction surface 221 is formed at one side of the inner surface to be perpendicular to the outer surface of the plate portion 210. The second noise inducing surface 222 is formed to be inclined with respect to the outer surface of the plate portion 210 and is inclined downward toward the vertical surface side. The third noise guide surface 223 and the second noise guide surface 222 and the outer surface of the plate portion 210 so that the flow air impinging on the second noise guide surface 222 can flow into the plate portion 210 without vortex, As shown in Fig. The noise passage hole 224 is formed between the first noise inducing surface 221 and the second noise inducing surface 222 so that noise induced along the second noise inducing surface 222 is passed.

The angle? Formed by the first noise inducing surface 221 and the second noise inducing surface 222 of the noise inducing unit 220 is 15 to 60.. When the angle formed by the first noise inducing surface 221 and the second noise inducing surface 222 is less than 15,, the inclination of the second noise inducing surface 222 is too sharp. In this case, air flowing along the traveling direction of the vehicle hits the abrupt second noise induction surface 222 to generate a vortex, thereby generating a secondary noise and preventing noise from entering the noise passage hole 224 do.

If the angle? Between the first sound-inducing surface 221 and the second sound-inducing surface 222 exceeds 60,, the punching depth can not be sufficiently secured. Therefore, since the noise hole 224 having a sufficient width can not be secured, the noise can not be smoothly entered into the noise hole 224.

Therefore, since the angle? Between the first noise induction surface 221 and the second noise induction surface 222 is maintained at 15 to 60 ㅀ, the flow air generated by the train movement moves to the noise inducing unit 220 A vortex is not generated even when it meets, so that noise is smoothly introduced into the noise venthole 224.

The noise passage hole 224 of the noise guide portion 220 has a width d of 0.1 to 5 mm and a width D of 2 to 10 mm and an area of the noise passage hole 224 of 0.1 to 0.5 mm ² . The thickness T of the plate portion 210 is 0.1 to 2 mm and the opening ratio of the noise passing hole 224 is 0.1 to 3.0% per m ² .

When the width d of the noise passing hole 224 of the present invention is less than 0.1 mm and the width D is less than 2 mm, the noise passage hole 224 of a sufficient width can not be secured, 224). &Lt; / RTI >

When the width d of the noise passage hole 224 exceeds 5 mm and the width D exceeds 10 mm, the noise reduction effect is not greatly improved, but the incision portion becomes too large, The thickness T of the plate portion 210 is increased by the increased width d and the entire thickness of the soundproofing structure is increased. So that it easily flows into the inside of the plate portion 210, thereby contaminating the perforated plate 130 of the noise blocking member 100. Therefore, the noise passing hole 224 has the shortest width d of 0.1 to 5 mm and the longest width D of 2 to 10 mm.

13 is a partially enlarged cross-sectional view showing a state in which the noise inducing part 220 is manufactured in the plate part 210 by the manufacturing tool 20 of the present invention. The manufacturing tool 20 for manufacturing a guide grill includes a tool vertical surface 21 formed to be perpendicular to the outer surface of the plate portion 210 and a tool vertical surface 21 formed to be inclined with respect to the outer surface of the plate portion 210, A tool inclined surface 22 formed to be inclined downward toward the side of the tool 21 is formed.

A pointed portion 23 is formed between the tool vertical surface 21 and the end of the tool inclined surface 22 to form a noise passage hole 224 so as to allow noise induced along the tool inclined surface 22 to pass therethrough.

The pointed portion 23 is formed by forming the tool vertical surface 21 and the tool inclined surface 22 at an angle of 15 to 60 degrees.

When the angle? Between the tool vertical surface 21 and the second noise inducing surface 222 is less than 15,, the inclination of the tool inclined surface 22 is too sharp. In this case, air flowing along the traveling direction of the vehicle hits the abrupt second noise inducing surface 222 to generate a vortex, thereby generating a secondary noise and also allowing the vehicle noise to flow into the noise passing hole 224 Interfere.

When the angle? Between the tool vertical surface 21 and the tool inclined surface 22 exceeds 60,, the punching depth can not be sufficiently secured. Therefore, since the noise hole 224 having a sufficient width can not be secured, the noise can not be smoothly entered into the noise hole 224.

Therefore, since the angle θ between the tool vertical surface 21 and the tool inclined surface 22 is maintained at 15 to 60 °, vortex is not generated even when the flow air generated by the train travel meets the noise inducing unit 220 Thus, the noise is smoothly introduced into the noise venthole 224.

The sharpened portion 23 of the manufacturing tool 20 may be coated with a wear-resistant coating layer. The abrasion resistant coating layer is formed by spraying a powder composed of 96 to 98% by weight of chromium oxide (Cr 2 O 3) and 2 to 4% by weight of titanium dioxide (TiO 2) in a pointed portion, and the thickness of the coating is 50 to 600 μm And the hardness is plasma-coated to maintain 900 to 1000 HV.

The abrasion resistant coating layer is formed by spraying a powder composed of 96 to 98% by weight of chromium oxide (Cr2O3) and 2 to 4% by weight of titanium dioxide (TiO2).

The reason why the ceramic coating is applied to the outer surface of the pointed portion 23 is to prevent abrasion and corrosion. Compared to chrome plating or nickel chrome plating, the ceramic coating is excellent in corrosion resistance, scratch resistance, abrasion resistance, impact resistance and durability.

Chromium oxide (Cr2O3) acts as a passivity layer that blocks oxygen entering the inside of the metal, thereby preventing rusting.

Titanium dioxide (TiO2) is a white pigment because it is very stable physicochemically and has high hiding power. And is also widely used for ceramics having high refractive index because of high refractive index. And has characteristics of photocatalytic property and superhydrophilic property. Titanium dioxide (TiO2) acts as an air purification function, an antibacterial function, a harmful substance decomposition function, a pollution prevention function, and a discoloration prevention function. This titanium dioxide (TiO2) ensures that the wear-resistant coating layer is coated on the outer surface of the pointed portion 23, and the foreign matter adhered to the wear-resistant coating layer is decomposed and removed to prevent the wear-

When chromium oxide (Cr 2 O 3) and titanium dioxide (TiO 2) are mixed and used, the mixing ratio thereof is such that 2 to 4% by weight of titanium dioxide (TiO 2) is mixed with 96 to 98% by weight of chromium oxide (Cr 2 O 3) desirable.

When the mixing ratio of chromium oxide (Cr 2 O 3) is less than 96 to 98%, the coating of chromium oxide (Cr 2 O 3) often breaks in an environment of high temperature and the like, The effect was suddenly decreased.

When the mixing ratio of titanium dioxide (TiO2) is less than 2 to 4% by weight, the effect of titanium dioxide (TiO2) is insignificant so that the purpose of mixing it with chromium oxide (Cr2O3) is discolored. That is, titanium dioxide (TiO2) is used to prevent foreign matter adhering to the periphery of the outer surface of the pointed portion 23 from being disassembled and removed, thereby preventing the outer surface of the pointed portion 23 from being corroded or damaged. , There is a problem that it takes much time to disassemble the attached foreign matter.

The coating layer made of these materials is plasma-coated to have a thickness of 50 to 600 mu m around the outer surface of the pointed portion 23, a hardness of 900 to 1000 HV, and a surface roughness of 0.1 to 0.3 mu m.

The abrasion resistant coating layer is sprayed by jetting the powder powder and the gas at 1400 DEG C around the outer surface of the pointed portion 23 at a Mach 2 speed and spraying the powder at 50 to 600 mu m.

If the thickness of the wear-resistant coating layer is less than 50 탆, the above-mentioned effect of the ceramic coating layer can not be guaranteed. If the thickness of the wear-resistant coating layer exceeds 600 탆, the above- There is a problem that working time and material cost are wasted.

While the outer surface of the pointed portion 23 is coated with the abrasion-resistant coating layer, the temperature of the outer surface of the pointed portion 23 is raised. In order to prevent the outer surface of the heated pointed portion 23 from being deformed, Cooled by a cooling device (not shown) to maintain a temperature of 150 to 200 ° C.

A sealing material made of anhydrous chromic acid (CrO3) made of a metal-based glass quartz system may further be applied to the periphery of the abrasion-resistant coating layer. Anhydrous chromic acid is applied as an inorganic sealing material around a coating layer made of chromium nickel powder.

Anhydrous chromic acid (CrO3) is used in places that require high abrasion resistance, lubricity, heat resistance, corrosion resistance and releasability, is not discolored in the atmosphere, has high durability, and has good abrasion resistance and corrosion resistance. The coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m. If the coating thickness of the sealing material is less than 0.3 占 퐉, the sealing material easily peels off even in a slight scratch groove, so that the above-mentioned effect can not be obtained. If the coating thickness of the sealing material is made thick enough to exceed 0.5 탆, pin holes, cracks, and the like will increase on the plated surface. Therefore, the coating thickness of the sealing material is preferably about 0.3 to 0.5 mu m.

Therefore, since the coating layer having excellent abrasion resistance and oxidation resistance is formed around the outer surface of the pointed portion 23, the outer surface of the pointed portion 23 is prevented from being worn or oxidized, thereby extending the service life of the product.

The method for manufacturing the noise guide member 200 includes a first noise inducing surface 221 formed at one side of the inner surface of the plate portion 210 so as to be perpendicular to the outer surface of the plate portion 210, A second noise guide surface 222 formed to be inclined downward toward the first noise guide surface 221 and a second noise guide surface 222 formed between the first noise guide surface 221 and the second noise guide surface 222, And a noise passage portion 224 through which the noise induced along the guide surface 222 passes.

The manufacturing method of the noise inducing member 200 is such that the sharp point portion 23 is formed at the lower end portion and the tool vertical surface 21 and the tool inclined surface 22 are inclined at an angle? And a manufacturing tool preparation step (S10). (S20) for preparing a plate having a thickness (T) of 0.1 to 2 mm when the manufacturing tool (20) is prepared. When the plate is prepared, it has a setting step (S30) in which the plate is loaded to the lower portion of the press and then set. A punching step S40 of punching the set plate with the manufacturing tool 20 to form a first noise induction surface 221, a second noise inducing surface 222, and a noise passage hole 224 in the plate, ). And a transfer step (S50) of transferring the punched plate to the next process after the punching step (S40). When the processed plate is transferred, it has an inspection step (S60) of confirming whether or not the transferred plate portion 210 is defective. In the inspecting step S60, the noise inducing part 220 punched in the punching step S40 has a step width d of 0.1 to 5 mm and a length D of the noise passing hole 224 of the noise passing hole 224 2 to 10 mm, and the area occupied by the noise hole 224 is 0.1 to 0.5 mm ² .

The noise inducing member 200 and the manufacturing tool and the manufacturing method thereof have the following advantages.

The noise inducing unit 220 includes a first noise inducing surface 221 formed at one side of the plate 210 in a direction perpendicular to the outer surface of the plate 210 and a second noise inducing surface 221 formed to be inclined with respect to the outer surface of the plate 210. A second noise guide surface 222 formed to be inclined downward toward the first noise guide surface 221 and a second noise guide surface 222 formed between the second noise guide surface 222 and the outer surface of the plate portion 210, A third noise guide surface 223 for guiding the flow air striking the surface 222 to flow toward the outer surface side of the plate portion 210 without vortexes and a second noise guide surface 221 and a second noise guide surface 222, And a noise passage hole 224 formed between the end portions and through which the noise induced along the second noise guide surface 222 is passed.

Accordingly, the flow of the air generated in the tunnel due to the running of the train hits the second noise inducing surface 222 of the noise inducing unit 220, and the air bombarding the second noise inducing surface 222, And then flows along the outer surface of the plate portion 210 on the third noise inducing surface 223 after sliding along the surface 222.

Therefore, no vortex is generated in the periphery of the noise inducing unit 220, so that the noise generated between the wheels and the rail during the traveling of the train smoothly flows into the noise passing hole 224, thereby maximizing the noise reduction effect.

Second, the angle? Formed by the first noise inducing surface 221 and the second noise inducing surface 222 is 15 to 60 mm; The flow air generated by the running of the train rides over the third noise inducing surface 223 after hitting the second noise inducing surface 222. [ When the angle? Between the first noise inducing surface 221 and the second noise inducing surface 222 is less than 15,, the inclination of the second noise inducing surface 222 is too sharp. In this case, air flowing along the traveling direction of the train hits the abrupt second noise induction surface 222 to generate a vortex, thereby generating a secondary noise and also allowing the noise of the train to flow into the noise passage hole 224 Interfere. If the angle? Between the first sound-inducing surface 221 and the second sound-inducing surface 222 exceeds 60,, the punching depth can not be sufficiently secured.

Therefore, since the noise hole 224 having a sufficient width can not be secured, the noise can not be smoothly entered into the noise hole 224.

Therefore, since the angle (?) Formed by the first noise inducing surface 221 and the second noise inducing surface 222 is maintained at 15 to 60 ㅀ, vortexing occurs even when the flow air generated by the train meets the noise inducing unit 220 So that noise is smoothly introduced into the noise venthole 224.

Third, the noise passing hole 224 has a width d of 0.1 to 5 mm, a width D of 2 to 10 mm, an area occupied by the noise passing hole 224 of 0.1 to 0.5 mm ² , 210 has a thickness T of 0.1 to 2 mm and an aperture ratio of the noise passing hole 224 is 0.1 to 3.0% per m ² . When the width d of the noise passing hole 224 is less than 0.1 mm and the width D is less than 2 mm, a sufficient width of the noise passing hole 224 can not be ensured so that the noise is smoothly transmitted to the noise passing hole 224 I can not get in and out.

When the width d of the noise passage hole 224 exceeds 5 mm and the width D exceeds 10 mm, the noise reduction effect is not greatly improved, but the incision portion becomes too large, The thickness T of the plate portion 210 is increased by the increased width d and the entire thickness of the soundproofing structure is increased. So that it easily flows into the inside of the plate portion 210, thereby contaminating the perforated plate 130 of the noise blocking member 100.

Therefore, the noise passing hole 224 has the shortest width d of 0.1 to 5 mm and the longest width D of 2 to 10 mm.

Fourth, the point of sharpening 23 of the manufacturing tool 20 is coated with an abrasion-resistant coating layer comprising 96-98% by weight of chromium oxide (Cr2O3) and 2-4% by weight of titanium dioxide (TiO2) The mixed powder is sprayed on the pointed portion, the coating thickness is 50 to 600 mu m, and the hardness is plasma-coated to maintain 900 to 1000 HV.

Therefore, since the coating layer having excellent abrasion resistance and oxidation resistance is formed around the outer surface of the pointed portion 23, the outer surface of the pointed portion 23 is prevented from being worn or oxidized, thereby prolonging the life of the manufacturing tool 20 .

Meanwhile, the manufacturing tool 20 may be formed of nodular cast iron. The nodular cast iron is heated to a temperature of 1600 to 1650 ° C to be molten, then subjected to desulfurization treatment, and subjected to spheroidizing treatment at a temperature of 1500 to 1550 ° C by adding a spheroidizing treatment agent containing magnesium in an amount of about 0.3 to 0.7% by weight.

Since nodular cast iron is a cast iron in which graphite is spherically crystallized during the solidification process by adding magnesium and the like to the molten metal of the common gray cast iron, the shape of the graphite is spherical compared to gray cast iron. Since the nodular cast iron has a small notch effect, the stress concentration phenomenon is reduced and the strength and toughness are greatly improved.

The nodular cast iron of the present invention is heated to 1600 to 1650 占 폚 to be molten, then subjected to a desulfurization treatment, and a spheroidizing agent containing magnesium in an amount of about 0.3 to 0.7% Followed by heat treatment.

Here, when the nodular cast iron is heated to less than 1600 ° C, the entire structure is not sufficiently melted. If the cast iron is heated above 1650 ° C, unnecessary energy is wasted. Therefore, it is preferable to heat the nodular cast iron to 1600 to 1650 ° C.

When the amount of magnesium is less than 0.3% by weight, the effect of injecting the spheroidizing agent is negligible. When the amount of magnesium is less than 0.3% by weight, the effect of injecting spheroidizing agent is insignificant. When the amount of magnesium is less than 0.3% There is a problem in that an expensive material cost is increased. Therefore, the mixing ratio of magnesium in the spheroidizing agent is preferably about 0.3 to 0.7% by weight.

When the spheroidizing treatment agent is injected into the molten nodular cast iron, it is projected at 1500 ~

. If the spheroidizing treatment temperature is lower than 1500 ° C., the spheroidizing treatment is not properly performed. If the spheroidizing treatment temperature is higher than 1550 ° C., the spheroidizing treatment effect is not greatly improved, but unnecessary energy is wasted. Therefore, the spheroidization treatment temperature is preferably 1500 to 1550 ° C.

Since the manufacturing tool 20 of the present invention is made of the nodular cast iron, the stress concentration phenomenon is reduced because the notch effect is small, and the strength and toughness are greatly improved.

Also, a polypropylene resin composition having excellent impact resistance against external impact or external environment can be coated around the plate portion 210. The polypropylene resin composition comprises a polypropylene random block copolymer composed of 75 to 95% by weight of an ethylene-propylene-alphaolefin random copolymer and 5 to 25% by weight of an ethylene-propylene block copolymer having an ethylene content of 20 to 50% by weight .

The polypropylene random block copolymer is preferably 75 to 95% by weight of the ethylene-propylene-alphaolefin random copolymer and 5 to 25% by weight of the ethylene-propylene block copolymer. The ethylene- When the content of the ethylene-propylene block copolymer is less than 5% by weight, the impact resistance is deteriorated. When the content of the ethylene-propylene block copolymer is more than 25% by weight, the rigidity is deteriorated do.

Wherein the ethylene-propylene-alpha olefin random copolymer comprises 0.5 to 7% by weight of ethylene and 1 to 15% by weight of an alpha-olefin having 4 to 5 carbon atoms and improves mechanical stiffness and heat resistance of the polypropylene resin composition, As shown in Fig. The ethylene content is preferably from 0.5 to 5% by weight, more preferably from 1 to 3% by weight. When the content of ethylene is less than 0.5% by weight, the whitening resistance is deteriorated. When the content is more than 7% by weight, . Further, the alpha olefin means any alpha olefin except ethylene and propylene, and is preferably butene. When the number of carbon atoms is less than 4 or more than 5, the reactivity of the alpha-olefin with the comonomer is low during the production of the random copolymer, making it difficult to produce the copolymer. Further, it may contain 1 to 15% by weight, preferably 1 to 10% by weight, and more preferably 3 to 9% by weight of the above-mentioned alpha olefin. If the amount of the alpha-olefin is less than 1% by weight, the crystallinity becomes higher than necessary and the transparency is lowered. When the amount of the alpha-olefin is more than 15% by weight, the crystallinity and rigidity are lowered and the heat resistance is significantly lowered.

In addition, the ethylene-propylene block copolymer contains 20 to 50% by weight of ethylene and imparts impact resistance to the polypropylene resin composition and enables finely dispersing, thereby imparting both whitening resistance and transparency. The ethylene content may preferably be 20 to 40% by weight, and if it is less than 20% by weight, the impact resistance is deteriorated. If it exceeds 50% by weight, the impact resistance and whitening resistance may be deteriorated.

Since the polypropylene resin composition having excellent impact resistance against external impact or external environment is coated around the plate portion 210 of the noise inducing member 200, it is not easily damaged even by external impact, do.

10 is a view for explaining an effect of noise reduction according to each length of the noise blocking member in the arrangement structure of the railway wheel sound barrier of the present invention.

Referring to FIG. 10, it can be seen that in the arrangement structure of the railway wheel sound barrier of the present invention, the noise shielding members can reduce noise of different frequency bands according to their lengths.

That is, as shown in FIG. 10, the noise-blocking member 100 of the first length having the longest length reduces noise in the low-frequency band, and the noise-blocking member 100 of the second length and the third length, It can be seen that the noise in the high frequency band is reduced.

Therefore, according to the arrangement structure of the railway wheel sound barrier of the present invention, it has excellent noise reduction performance in the entire frequency band of noise.

In addition, since the railway wheel sound barrier of the present invention is installed so as to surround the wheels and the railroad car of the train, noise suppression and noise reduction efficiency are improved in the lower portion of the train.

In addition, since the railway wheel sound barrier of the present invention does not use a chemical noise reduction material, it can be designed and used in an environmentally friendly manner.

The first and second soundproof walls 10 and 20 may be formed of a material such as a galvanized steel sheet or an aluminum material. The first and second soundproof walls 10 and 20 may be formed of smoke, dust, A coating layer is formed of a surface coating material of a metal material in order to prevent surface corrosion from contaminants and the like. The coating layer is composed of 60 wt% of alumina powder, 30 wt% of NH ₄ Cl, 2.5 wt% of zinc, 2.5 wt% of copper, 2.5 wt% of magnesium and 2.5 wt% of titanium.

The alumina powder is added for the purpose of sintering, entangling, fusion prevention, etc. when heated to a high temperature. When such an alumina powder is added in an amount of less than 60% by weight, the effect of sintering, entangling and fusion prevention is deteriorated. When the alumina powder exceeds 60% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 60 wt% of the alumina powder.

The NH ₄ Cl reacts with steam, aluminum, zinc, copper, and magnesium to activate diffusion and penetration. This NH ₄ Cl is added in an amount of 30% by weight. When NH ₄ Cl is added in an amount of less than 30% by weight, the reaction with aluminum, zinc, copper and magnesium in a vapor state is not properly performed, thereby failing to activate diffusion and penetration. On the other hand, if NH ₄ Cl exceeds 30 wt%, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable to add 30 wt% of NH ₄ Cl.

The zinc is compounded to prevent corrosion of the metal that is in contact with water and to be used for electrical applications. 2.5% by weight of this zinc is mixed. If the mixing ratio of zinc exceeds 2.5% by weight, corrosion of the metal which is in contact with water can not be properly prevented. On the other hand, when the mixing ratio of zinc exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that zinc is mixed at 2.5% by weight.

The copper is combined with the aluminum to increase the hardness and tensile strength of the metal. This copper is mixed at 2.5% by weight. If the mixing ratio of copper is less than 2.5 wt%, the hardness and tensile strength of the metal can not be properly increased when combined with aluminum. On the other hand, when the mixing ratio of copper exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, copper is preferably mixed at 2.5% by weight.

Since the pure metal of magnesium has a low structural strength, it is used in combination with the zinc and the like to improve the hardness, tensile strength and corrosion resistance of the metal. This magnesium is mixed at 2.5% by weight. When the mixing ratio of magnesium is less than 2.5% by weight, the hardness, the tensile strength and the corrosion resistance to the salt water of the metal are not greatly improved when they are combined with zinc and the like. On the other hand, when the mixing ratio of magnesium exceeds 2.5% by weight, the above-mentioned effect is not further improved, but the material cost is greatly increased. Therefore, it is preferable that magnesium is mixed with 2.5% by weight.

The titanium is a lightweight, hard and corrosion resistant transition metal element with a silver-white metallic luster. Its excellent corrosion resistance and specific gravity are low, so it weighs only 60% compared to steel. Therefore, the weight of the coating applied to the metal base material is reduced, Excellent water resistance and corrosion resistance.

This titanium is mixed at 2.5% by weight. When the mixing ratio of titanium is less than 2.5% by weight, the weight of the coating material applied to the metal base material is not so reduced, and gloss, water resistance and corrosion resistance are not greatly improved. On the other hand, when the mixing ratio of titanium exceeds 2.5% by weight, the above effect is not further improved, but the material cost is greatly increased. Therefore, titanium is preferably mixed at 2.5% by weight.

The surface coating method of the first and second soundproof walls 10 and 20 according to the present invention is as follows.

The base material in which the coating layer is to be formed and the coating material blended in the above composition are put into the closed furnace together with argon gas at a rate of 2 L / min to prevent the oxidation of the base material inside the furnace. To 700 < 0 > C to 800 < 0 > C for 4 to 5 hours.

Aluminum powder, alumina powder, zinc, copper, magnesium, and titanium compounds penetrate into the surface of the base material to form a coating layer. The alumina powder, zinc, copper, magnesium, do.

After the coating layer is formed, the inside temperature of the closed material is maintained at a temperature of 800 ° C. to 900 ° C. for 30 to 40 hours so that a corrosion-resistant coating layer is formed on the surface of the base material to isolate the surface of the base material from the outside air. At this time, the abrupt temperature change in performing the above process may cause the coating layer on the surface of the base material to peel off, so that the temperature is changed at a rate of 60 ° C / hr.

The coating layer of the present invention has the following advantages.

The coating layer of the present invention has a very wide range of applications and can be applied by various methods such as curtain coating, spray painting, dip coating, flooding and the like.

The coating layer of the present invention can be coated with a very thin layer thickness in addition to the principle protection against corrosion and / or scale, thereby improving electrical conductivity as well as material and cost reduction. A thin electrically conductive primer may be applied to the top of the coating layer if high electrical conductivity is desired after the hot forming process.

After the molding process or the hot forming process, the coating material can be retained on the surface of the substrate, for example, to increase scratch resistance, to improve corrosion protection, to meet aesthetic appearance, to prevent discoloration, And can be provided as a primer for conventional downstream processes (e.g., immersing and electrotransfer dip coating).

According to the present invention, the first and second sound barrier walls 10 and 20 are made of a material such as a zinc-coated steel plate or an aluminum material, and the first and second sound barrier walls 10 and 20 are made of alumina powder, ₄ Cl, zinc, copper, magnesium, since the coating layer is a coating made of titanium can prevent corrosion of the surface of the first and second noise barrier (10, 20) from the exhaust of the railway car, dust, and contaminants.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

1, 1 ': rail 10: first soundproof wall
20: second soundproof wall 100:
200: noise inducing member 1000: soundproofing member

Claims

A railway wheel sound barrier for preventing noise generated between a wheel and a rail during operation of a train,
A first soundproof wall (10) facing the first rail (1) of the two rails; And
And a second soundproof wall (20) facing the second one of the two rails (1 '),
The first soundproof wall 10 and the second soundproof wall 20 may include a noise shielding member 100 configured to have an internal space into which noise generated between the wheel and the rail may flow, And a noise-inducing member (200) disposed in front of the noise suppressing member and guiding the noise to move toward the noise-blocking member (100)
The soundproofing member 1000 is arranged in the height direction of the first soundproof wall 10 and the second soundproof wall 20 so as to form respective layers of the first soundproof wall 10 and the second soundproof wall 20, Characterized in that the noise inducing member (200) is arranged in a predetermined pattern in which the distance adjacent to the two rails (1, 1 ') is adjusted.
Railway wheel soundproof wall.

The method according to claim 1,
The pattern in which the soundproofing member (1000)
The noise guide member 200 moves from the center of the first soundproof wall 10 and the second soundproof wall 20 to the upper end and the lower end of the first soundproof wall 10 and the second soundproof wall 20, , 1 ').&Lt; RTI ID = 0.0 >
Railway wheel soundproof wall.

The method according to claim 1,
The pattern in which the soundproofing member (1000)
Wherein the noise guide member 200 is arranged closer to the two rails 1 and 1 'from the lower end of the first soundproof wall 10 and the second soundproof wall 20 toward the upper end.
Railway wheel soundproof wall.

The method according to claim 1,
The pattern in which the soundproofing member (1000)
The sound guide member 200 of the soundproofing member 1000 of each of the layers of the first soundproof wall 10 and the second soundproof wall 20 is adjacent to the two rails 1 and 1 'at the same distance, 1000 are arranged to be inclined at a predetermined angle from the two rails (1, 1 ').
Railway wheel soundproof wall.

The method according to claim 1,
The noise blocking member (100)
A plurality of sound insulation walls are arranged in the longitudinal direction of the two rails 1 and 1 'and are stacked in the height direction of the first sound insulation wall 10 and the second sound insulation wall 20, A main chamber 110 in which an external noise flows into the noise inflow space 111 and is reduced;
The main chamber 110 is arranged in a noise inflow space 111 of the main chamber 110. The noise introduced into the noise inflow space 111 of the main chamber 110 passes through the noise inflow space 111, A perforated plate 120, 120 'formed with a plurality of grooves 121, 121'; And
And slots (130) formed on both sides of the main chamber (110) along the longitudinal direction to slide both sides of the perforated plates (120, 120 ').
Railway wheel soundproof wall.

The method according to claim 1,
A plurality of noise inlet holes 121 are formed to allow external noise to flow into the noise inlet space 111 of the main chamber 110,
Characterized in that the noise inlet holes (121) are formed so that the perforated plate (120) has a porosity of 1-10%
Railway wheel soundproof wall.

The method according to claim 1,
The noise inlet holes 121,
Characterized in that the inlet (121a) is narrower than the outlet (121b) and the cross sectional area ratio of the beginning of the inlet (121a) to the end of the outlet (121b) is 1: 1.2 to 1:
Railway wheel soundproof wall.

The method according to claim 1,
Wherein the perforated plate (120 ') is bent in a ""shape to increase the surface area.
Railway wheel soundproof wall.

The method according to claim 1,
The noise inducing member (200)
A plate portion 210 positioned in front of the noise blocking member 100;
A plurality of noise inducing parts 220 formed on the plate part 210 to reduce the flow resistance and guide the noise between the wheels and the rail of the train toward the noise shielding member 100;
The noise inducing unit 220,
A first noise inducing surface 221 formed at an inner side of the plate portion 210 at right angles to the outer surface of the plate portion 210 and a second noise inducing portion 220 formed at an inclined angle with respect to the outer surface of the plate portion 210, And the second noise guide surface 222 and the outer surface of the plate portion 210 so that the flow air impinging on the second noise guide surface 222 flows toward the outer surface side of the plate portion 210 without vortex And a noise generated along the second noise induction surface 222 formed between the first noise inducing surface 221 and the second noise inducing surface 222. The third noise inducing surface 223 guides the first noise inducing surface 221 and the second noise inducing surface 222, And a noise passage hole (224) passed therethrough;
The angle? Formed by the first noise induction surface 221 and the second noise inducing surface 222 is 15 to 60 mm;
Characterized in that the flow air generated by the running of the vehicle rides over the third noise inducing surface (223) after hitting the second noise inducing surface (222)
Railway wheel soundproof wall.

10. The method of claim 9,
The noise passage hole (224)
The short width d is 0.1 to 5 mm, the long width D is 2 to 10 mm,
The area occupied by one sound-transmitting hole 224 is 0.1 to 0.5 mm,
The thickness T of the plate portion 210 is 0.1 to 2 mm,
Characterized in that the opening ratio of the noise passing hole (224) is 0.1 to 3.0% per m.
Railway wheel soundproof wall.

10. The method of claim 9,
The noise inducing member (200)
The sharpened portion 23 is formed at the lower end portion and the sharpened portion 23 is formed by a manufacturing tool preparation step S10 in which the tool vertical surface 21 and the tool inclined surface 22 are formed at an angle of 15 to 60 degrees;
A plate preparing step (S20) of preparing a plate having a thickness (T) of 0.1 to 2 mm;
A setting step (S30) of setting the plate after loading the plate under the press;
A punching step (S40) of punching the set plate with a manufacturing tool to form a first sound-inducing surface 221, a second sound-inducing surface 222, and a noise-transmitting hole 224 in the plate;
A transfer step (S50) of transferring the punched plate to the next process;
(S60) for checking whether the transferred plate is defective or not.
Railway wheel soundproof wall.

12. The method of claim 11,
In the punching step (S40), the noise inducing member (200)
The length d of the noise passing hole 224 is 2 to 10 mm and the area occupied by the noise passing hole 224 is 0.1 to 0.5 mm, . The method of claim 1,
Railway wheel soundproof wall.