WO2014084488A1

WO2014084488A1 - Micro-pressure wave reduction device for railroad tunnels, and micro-pressure wave reduction hood including same

Info

Publication number: WO2014084488A1
Application number: PCT/KR2013/008476
Authority: WO
Inventors: 김동현
Original assignee: 한국철도기술연구원
Priority date: 2012-11-27
Filing date: 2013-09-23
Publication date: 2014-06-05
Also published as: KR101394980B1

Abstract

A micro-pressure wave reduction device includes: an intake pipe (10); and an intake unit (11) which intakes air. When a train moves into the entrance of a railroad tunnel or a hood (2), the air at the entrance of the tunnel or in the hood (2) is taken in through the intake pipe (10), and the internal pressure at the entrance of the tunnel or in the hood (2) is lowered so that a compression wave resulting from the movement of the train is reduced and a micro-pressure wave resulting from the compression wave is reduced.

Description

Micro-pressure wave reduction device for railway tunnel and micro-pressure wave reduction type hood having same

The present invention provides a device capable of reducing pressure waves inside a railway tunnel and at the same time reducing micro-pressure waves at the exit of the railway tunnel. It relates to a micro-pressure wave reducing hood installed at the inlet.

In the railway tunnel where the train passes, pressure waves are generated as the train traveling at high speed enters the tunnel. The pressure wave propagates into the tunnel and then passes through the tunnel exit. radiation in the form of pressure waves). Since subatmospheric waves cause noise and vibration to the surroundings, it is very important to reduce the subatmospheric waves in railway tunnels.

Republic of Korea Patent No. 10-331955 discloses a technique for installing a hood (hood) at the entrance of the tunnel in order to reduce the micro-pressure wave generated when the train enters the railway tunnel. 1 is a schematic view of a tunnel hood disclosed in Republic of Korea Patent No. 10-331955. Figure 2 is a schematic view showing another conventional tunnel hood, the conventional hood shown in Figure 2 is configured in the form of an inclined inlet.

1 and 2, in order to reduce the micro-pressure waves generated in the railway tunnel, a hood 2 having an arcuate cross section is conventionally installed at the entrance of the tunnel, and the hood 2 has its roof portion. Multiple vents 25 were formed in or the front of the hood 2 was inclined downward. The hood 2 in which the ventilation pipe 25 is formed is useful for reducing the micro-pressure waves in the railway tunnel.

In recent years, the traveling speed of the train is increasing, and the length of the railway tunnel is also increasing. As the tunnel gets longer, the micropressure wave increases. According to the prior art in which the hood is installed at the entrance of the tunnel, the length of the hood must be increased accordingly in order to cope with the situation in which the train traveling speed increases and the tunnel length increases. However, there are difficulties in increasing the length of the hood because many facilities such as props are arranged at the tunnel entrance. In addition, as the length of the hood increases, the thickness, rigidity, etc. of the hood must be further increased, thereby increasing the cost. Because of these problems, there is a limit to the method of reducing the micro pressure wave by lengthening the hood only.

An object of the present invention is to provide a technique capable of reducing pressure waves inside a tunnel and at the same time reducing micro-pressure waves at the tunnel exit.

In the present invention, the pressure is increased due to the air compressed when the train enters the tunnel by lowering the air pressure in the inlet or hood of the tunnel by sucking air at the inlet or the hood of the railway tunnel for the above purpose. Provide technology to prevent

In particular, it is an object of the present invention to provide a technique capable of effectively reducing the micro-pressure waves in a tunnel without increasing the hood length.

In the present invention, for the above purpose, by installing an additional mechanical device at the entrance of the railway tunnel or by further installing a mechanical device at the hood constructed at the entrance of the railway tunnel, the compression wave generated when entering the tunnel of the train It provides a technique to attenuate.

In the present invention, there is provided a micro-pressure wave reducing device installed in the inlet, outlet or hood of the railway tunnel.

The micro-pressure wave reducing apparatus of the present invention includes: a suction pipe installed at one end thereof so as to communicate with the inside of the inlet, the outlet, or the hood of the tunnel; An air flow passage is formed inside, and a nozzle portion formed by narrowing the inner diameter of the air flow passage is formed at a position where the other end of the suction pipe is coupled with the air flow passage, and the air flow passage supplies and discharges air. An air inlet pipe coupled to the inhaler to suck air through the inlet pipe; When the train enters the inlet or hood of the railway tunnel, the air supplied through the air flow pipe passes through the nozzle part, and the air in the inlet or hood of the tunnel is sucked in through the suction pipe, whereby the internal air pressure of the inlet or hood of the tunnel By lowering the compression wave due to entering the train, and has a configuration to reduce the micro-pressure wave due to the compression wave.

According to the present invention, even if the train enters the entrance or hood of the tunnel, the air pressure reducing device of the present invention operates to lower the air pressure in the entrance or hood of the tunnel, so that the pressure does not increase due to the entry of the train. do. Therefore, it is possible to attenuate the compressed wave, and through the attenuation of the compressed wave, it is possible to greatly reduce the occurrence of micro-pressure waves at the exit of the tunnel.

According to the present invention, it is possible to reduce the tinnitus of the passengers in the train by reducing the micro-pressure waves, it is also possible to significantly reduce the noise and the resulting vibration at the tunnel exit. In addition, according to the present invention, it is possible to solve the problem caused by the micro-pressure wave in the long tunnel without further extending the length of the hood.

1 and 2 are schematic views showing a state in which a conventional micro pressure wave reduction hood is installed at a railway tunnel entrance.

3 and 4 is a schematic perspective view showing a state in which a micro-pressure wave reduction apparatus according to an embodiment of the present invention is installed in the hood of the inlet of the railway tunnel, respectively.

FIG. 5 is a schematic front view in the direction of arrow C of FIG. 3.

FIG. 6 is a schematic enlarged view of a portion A of FIG. 4.

FIG. 7 is a schematic cross-sectional view taken along line B-B of FIG. 6.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described. Although the present invention has been described with reference to the embodiments shown in the drawings, this is described as one embodiment, whereby the technical spirit of the present invention and its core configuration and operation are not limited.

As shown in Fig. 3 to Fig. 5, the micro-pressure wave reducing device 1 of the present invention is provided with a suction pipe 10. The suction pipe 10 is provided so as to communicate with the inside of the hood 2 constructed at the entrance of the railway tunnel or at the exit of the railway tunnel, or at the entrance or exit of the railway tunnel. Moreover, the micro-pressure wave reduction apparatus 1 of this invention is provided with the inhaler 11 which inhales air through the intake pipe 10. As shown in FIG.

In the embodiment of the figure, the hood 2 is formed at the entrance of the tunnel, and the micro-pressure wave reducing device of the present invention is installed in the hood 2, but the micro-pressure wave reducing device of the present invention is directly at the entrance of the tunnel. It may be installed. Furthermore, the micro-pressure wave reducing apparatus of the present invention may be installed at the exit of the tunnel. The hood in which the micro-pressure wave reducing apparatus of the present invention is installed may be provided at the exit of the tunnel.

In the present embodiment shown in the figure, a suction hole is formed in the hood 2, and one end of the suction pipe 10 is coupled to the suction hole of the hood 2. Therefore, the air inside the hood 2 is sucked into the suction pipe 10 through the suction hole. The other end of the suction pipe 10 is connected to the inhaler 11. The inhaler 11 sucks air through the suction pipe 10. The inhaler 11 may be composed of a vacuum generator in the form of an ejector. 6 and 7, when the inhaler 11 is configured as an ejector-type vacuum generator, an air flow path is formed inside the inhaler 11. An air flow pipe for supplying and discharging air is connected to the inhaler 11 so that air can flow into the air flow passage. The air flow tube includes a supply pipe 13 for supplying air into the inhaler 11, and a discharge pipe 14 for discharging air supplied from the supply pipe 13 through the inhaler 11. The supply pipe 13 and the discharge pipe 14 are each connected to an air flow passage formed inside the inhaler 11.

The nozzle part 15 is formed in the air flow path inside the inhaler 11. A portion having a narrow inner diameter in the air flow passage corresponds to the nozzle unit 15. In the embodiment shown in the figure, a separate nozzle portion 15 is fitted in the air flow passage. However, the nozzle portion may be formed by narrowing the inner diameter of the air flow path itself. Air is supplied from the external air supply device 20 to the supply pipe 13 and enters the inhaler 11. Air introduced in this way is discharged to the discharge pipe 14 through the nozzle unit 15. In the present invention, since the nozzle portion 15 is formed in the air flow passage, the air entering the inside of the inhaler 11 is very fast flow through the nozzle portion 15.

The other end of the suction pipe 10 is connected to the front position of the nozzle unit 15 in the inhaler 11. In other words, the other end of the suction pipe 10 is connected to a position where air has passed through the nozzle unit 15. Therefore, in the process of flowing air along the air flow path inside the inhaler 11, when the air passes through the nozzle portion 15 having a narrow inner diameter, the flow velocity is increased, and according to Bernoulli's theorem, in front of the nozzle portion 15 While the pressure is lowered to a substantially vacuum state, air is sucked up from the suction pipe 10 through the other end of the suction pipe 10 connected to the front of the nozzle unit 15 and discharged through the air flow passage. In the nozzle unit 15, it is preferable that the air flows at a high flow rate, so that the air supply device 20 is configured as a compressed air reservoir so that the compressed air is supplied to the nozzle unit 15.

One end of the suction pipe 10 is connected to the hood 2 and communicates with the inside of the hood 2. Therefore, when air is sucked out from the other end of the suction pipe 10 and discharged, the air inside the hood 2 is sucked into the suction pipe 10 through the suction pipe 10, and the air pressure inside the hood 2 is lowered accordingly. .

In the prior art, when a train enters the inlet or hood 2 of a tunnel, a compressed wave is generated while the air at the inlet of the railway tunnel or the air inside the hood 2 is compressed, thereby causing a micro-pressure wave at the exit of the tunnel. Will occur. However, in the present invention, when the train enters the tunnel through the hood 2, since the internal air pressure of the hood 2 is lowered due to the operation of the micro-pressure wave reducing device 1, the train enters the hood 2 Even if the pressure does not rise.

The air supplied from the air supply device 20 flows through the nozzle portion 15 at a high flow rate, and thus sucks the air inside the hood 2 through the suction pipe 10, thereby internalizing the inside of the hood 2. The air pressure is in a lowered state. Therefore, according to the present invention, even when the train enters the hood 2, it is possible to attenuate the compressed wave, and through the attenuation of the compressed wave, it is possible to greatly reduce the occurrence of micro-pressure waves at the exit of the tunnel. In particular, the compressed wave in the tunnel causes an ear-discomfort for the passengers inside the train cabin, but if the compressed wave is attenuated by the present invention, the tinnitus of the passengers in the train can also be reduced. The noise at the exit of the tunnel and the resulting vibrations can also be greatly reduced. In particular, the present invention is very useful for reducing micro-pressure waves in a long tunnel.

On the other hand, the micro-pressure wave reducing apparatus 1 of the present invention can be operated only when it is recognized that the train passes by a motion sensor or a speedometer that can sense that the train passes through the tunnel. That is, the micro-pressure wave reducing apparatus 1 of the present invention includes a sensor for detecting the passage of a train, and may be configured to start operation only when a signal indicating that the train passes through the tunnel is received through the sensor. For example, when the micro pneumatic wave reducing device 1 is installed at the entrance of the tunnel, or when the hood 2 having the micro pneumatic wave reducing device 1 is built at the entrance of the tunnel, the train is mounted on the hood 2. Alternatively, the micro-pressure wave reducing device 1 can be operated only when the sensor recognizes that the tunnel entrance is entered. Furthermore, when the micro pressure wave reducing device 1 is installed at the exit of the tunnel, or when the hood 2 having the micro pressure wave reducing device 1 is constructed at the tunnel exit, the sensor is placed inside the tunnel or in the tunnel. By installing just before the exit of the train, the state of the train passing through the tunnel by the sensor can be operated so that the micro-pressure wave reducing device (1). The sensor may be formed of a known motion sensor, a sensor installed on a rail of a railway, or the like.

The micro-pressure wave reducing device 1 of the present invention includes a plurality of suction pipes 10 and a plurality of suction pipes 11, and when viewed from the front of the tunnel, the plurality of suction pipes 10 are formed around the circumference of the hood 2. It may have a form that is coupled at intervals along the. In the embodiment in which the micro-pressure wave reducing device 1 includes a plurality of suction pipes 10 and a plurality of inhalers 11, an air flow pipe that supplies air to the inhaler 11 and allows air to escape from the inhaler 11. May be sequentially continued to the plurality of inhalers 11, but in order to maintain a high flow rate of air, it is preferable that the air flow pipes individually coupled to each inhaler 11 are connected to the air supply device 20, respectively. Do. In other words, a plurality of air flow pipes are extended from the air supply station 20, and each air flow pipe can be individually connected to the inhaler 11.

On the other hand, the micro-pressure wave reducing device 1 of the present invention may have a configuration capable of producing electric power by using the air discharged from the inhaler (11). That is, the micro-pressure wave reducing apparatus 1 of the present invention is further provided with an aerodynamic generator 30 connected to the air flow pipe (specifically, the discharge pipe 14) through which the air is discharged from the inhaler 11, thereby providing an inhaler 11. The aerodynamic generator 30 may be configured to produce electrical energy by the air discharged from the). Reference numeral 31 is a charging battery 31 for storing electricity produced by being connected to the aeroelectric generator 30, and reference numeral 25 is a ventilation pipe 25.

In the above description, the micro-pressure wave reduction device 1 of the present invention has been described as being installed in the hood 2, but the micro-pressure wave reduction device 1 of the present invention may be installed at the entrance of the tunnel, It may be installed at the outlet. On the other hand, the hood 2, on which the micro-pressure wave reducing device 1 of the present invention is installed, may be constructed at the entrance of the tunnel, but may also be constructed at the exit of the tunnel. The hood 2, in which the micro-pressure wave reduction device 1 of the present invention is installed, is constructed at the exit of the tunnel, or the micro-pressure wave reduction device 1 of the present invention is installed at the exit of the occupation tunnel, that is, at the end region of the tunnel without the hood. When installed, the micro-pressure wave reducing apparatus 1 sucks the compressed wave propagated in the tunnel in the longitudinal direction of the tunnel, thereby reducing the micro-pressure wave at the exit of the tunnel.

Claims

As a micro-pressure wave reducing device 1 installed at an entrance of a railway tunnel, an exit of a railway tunnel, or a hood 2,

A suction pipe (10), one end of which is installed to communicate with the entrance of the tunnel, the exit of the tunnel, or the inside of the hood (2);

An air flow passage is formed therein, and a nozzle portion 15 having an inner diameter of the air flow passage is narrowed at a position where the other end of the suction pipe 10 is coupled to the air flow passage, and in the air flow passage An air inlet pipe for supplying and discharging air, the inhaler 11 for sucking air through the inlet pipe 10;

When the train passes through the tunnel, the air supplied through the air flow pipe passes through the nozzle part 15 and sucks the air in the inside of the tunnel or the hood 2 through the suction pipe 10, thereby allowing the inside of the tunnel. Or by lowering the internal air pressure of the hood (2), attenuated compressed wave due to the entry of the train, micro-pressure wave reduction device, characterized in that to reduce the micro-pressure wave due to the compressed wave.
The method of claim 1,

The suction pipe 10 and the suction device 11 are provided in plurality, and when viewed in the longitudinal direction of the tunnel, the plurality of suction pipes 10 are spaced along the circumference of the inlet of the tunnel, the exit of the tunnel, or the hood 2. Micro-pressure wave reduction device, characterized in that installed in the place.
The method according to claim 1 or 2,

It is further provided with an aerodynamic generator 30 connected to the air flow pipe from which the air is discharged from the inhaler 11, characterized in that the aerodynamic generator 30 is configured to produce electrical energy by the air discharged from the inhaler 11. Micro-pressure wave reducing device
The method according to claim 1 or 2,

And a sensor for detecting the train passing through the tunnel, and configured to start operation only when the train receives a signal indicating that the train passes through the tunnel.
As a hood (2) installed at the entrance of a railway tunnel or at the exit of a railway tunnel,

A suction pipe 10 having one end installed in communication with the inside of the hood 2; An air flow passage is formed therein, and a nozzle portion 15 having an inner diameter of the air flow passage is narrowed at a position where the other end of the suction pipe 10 is coupled to the air flow passage, and in the air flow passage An air pressure reducing device (1) comprising an inhaler (11) for sucking air through the suction pipe (10) is provided with an air flow pipe for supplying and discharging air,

When the train passes through the hood (2), the air supplied through the air flow pipe passes through the nozzle unit 15, the air intake of the tunnel or the air in the hood (2) through the suction pipe 10, By reducing the internal air pressure of the hood (2), attenuation of the compressed wave due to the passage of the train, the micro-pressure wave reduced type hood, characterized in that to reduce the micro-pressure wave due to the compressed wave.
The method of claim 5,

The suction pipe 10 and the inhaler 11 is provided in plurality, and when viewed in the longitudinal direction of the tunnel, a plurality of suction pipe 10 is provided at intervals along the circumference of the hood (2) Micro-pressure wave reduction type hood to say.