JP3516638B2 - Tunnel pressure wave reduction structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, when a moving object such as a Shinkansen train (hereinafter referred to as a "moving body") rushes into a tunnel, is directed to the outside from the tunnel entrance on the opposite side of the tunnel entrance. Tunnel pressure wave reduction to reduce radiated pressure waves (hereinafter referred to as "micro-pressure waves") and pressure waves radiated to the outside through tunnel entrances and exits (hereinafter referred to as "rush waves") It is about structure.

[0002]

2. Description of the Related Art As shown in FIG. 8 (A), when a train 84 such as a Shinkansen rushes into a space of a tunnel 81 formed in a natural ground 80 from a tunnel entrance / exit end E1, a traveling direction of the train 84 The air in the tunnel ahead (to the right of the train 84 in FIG. 8A) is compressed and expanded. As a result, the pressure wave W1 of air having a pressure value as shown in FIG. 8C propagates in the tunnel in the right direction in the figure and is radiated from the tunnel entrance / exit end E2 to the outside of the tunnel.

At this time, the wave W2 radiated to the outside of the tunnel
Is called a micro-pressure wave at the time of entry, and is a low-frequency pressure wave having peak values a and b of pressure as shown in FIG. There is a case where it is heard as a shocking low tone in the vicinity of, and vibration is given to an object such as a glass window of a private house.

In order to prevent the above-mentioned micro-pressure wave, conventionally, a hood-like (cylindrical) structure (hereinafter referred to as "micro-pressure wave buffer") from the tunnel entrance / exit end (tunnel pit) E1 to the outside direction. Was provided. By such a micro pressure wave buffer, the compression / expansion action of the air in the tunnel when the train 84 enters the tunnel is alleviated, and the micro pressure wave radiated from the tunnel entrance / exit end to the outside of the tunnel or the micro pressure wave is generated. The level of low frequency sound and vibration generated by the waves was suppressed.

Further, in the conventional tunnel, as shown in FIG.
As shown in (A), the tunnel 8 formed in the natural ground 80
Train 84 enters / exits the tunnel E1 in the tunnel space within 1
If the vehicle rushes in from the rear of the train 84 in the traveling direction (see FIG. 8).
The pressure wave W3 of air is radiated to the outside of the tunnel on the left side of the train 84 in (A).

The pressure wave W3 is a wave having peak pressure values c and d as shown in FIG.
The positive peak and the negative peak of 2 are reversed. Less than,
This pressure wave W3 is called "rush wave". The inrush wave W3 is usually a pressure wave weaker than the micro-pressure wave and has directivity, and the pressure value at the side of the ground 80, for example, at the position P11 across the tunnel entrance / exit end E1 is the tunnel. It is larger than the pressure value on the outer side of the wellhead (the left side of the tunnel entrance / exit end E1 in FIG. 8).

[0007] In order to prevent rush wave described above, the applicant, the above-mentioned micro-pressure waves buffer Engineering in flange structure was provided a structure of a flanged (hereinafter, referred to as "collision Nyunami reducing structure".) Proposed a (See Japanese Patent Application No. 11-293266). Such impact Nyunami reduction structure, low-frequency sound and vibration levels have been found to suppress generated by rush waves upon entry into the tunnel of the train 84 is radiated from the tunnel and out end to the tunnel outside.

[0008]

SUMMARY OF THE INVENTION It is an object of the above-mentioned micro-pressure wave buffer engineering and collision Nyunami reduction structure (hereinafter, referred to as a "pressure wave reducing structure".) By but measures of micro-pressure waves and rush waves have been studied In recent years, as the speed of Shinkansen trains has increased, the influence of the micro-pressure wave and the inrush wave has increased, and more effective reduction measures are needed.

The present invention has been made in order to solve the above problems, and the problem to be solved by the present invention is to reduce the micro pressure wave or the inrush wave at the tunnel entrance at the time of train entry. It is to provide a wave reducing structure.

[0010]

In order to solve the above-mentioned problems, a tunnel pressure wave reducing structure according to claim 1 of the present invention is a pressure wave reducing structure provided at a tunnel well of a double-line type tunnel (81). 10) A tunnel pressure wave reducing structure configured by forming 10) into a predetermined shape, which is a side wall portion of the pressure wave reducing structure (10) on the side where the moving body (84) enters. The first pressure wave reducing structure side wall portion (10a) is separated from the tunnel center line (81a) on the ground extending parallel to the extending direction of the tunnel (81).
Go As, in the first pressure wave reducing structure sidewall portions movement (10a) as throughout the extended設方direction of the pressure wave reducing structure (10), the tunnel centerline (81a) Oite perpendicular cross section, the position of the center line (1 0c) of the pressure wave reducing structure (10), the movable body come entered the tunnel (81) (84) of the running center line (84a) It is characterized in that it is made to coincide with the projection position of the above on the ground (G).

Further, the tunnel pressure wave reducing structure according to claim 2 of the present invention is constituted by forming the pressure wave reducing structure (30) provided at the tunnel well of the double-line type tunnel (81) into a predetermined shape. First pressure wave reducing structure which is a side wall portion of the pressure wave reducing structure (30) on the side where the moving body (84) enters. The side wall (30a1) is connected to the tunnel (8
1) is moved away from the tunnel center line (81a) on the ground extending parallel to the extending direction of the pressure wave reducing structure (30) in a cross section perpendicular to the tunnel center line (81a). the position of the center line (3 0c), so as to coincide with the projection position of the ground (G) of the movable body come entered the tunnel (81) (84) of the running center line (84a), said first Side wall of pressure wave reducing structure (30a1)
Of the pressure wave reducing structure (30) of the general portion which is not enlarged and the side wall (3a) of the pressure wave reducing structure (30a3).
0a2), the side wall portion (30a) of the pressure wave reducing structure (30) of the general portion which is not enlarged is made to have an end portion of the first pressure wave reducing structure side wall portion (30a1).
3) is discontinuously connected to form a substantially hook-shaped structure.

Further, the tunnel pressure wave reducing structure according to claim 3 of the present invention is constructed by forming the pressure wave reducing structure (40) provided at the tunnel well of the double-line type tunnel (81) into a predetermined shape. First pressure wave reducing structure which is a side wall portion of the pressure wave reducing structure (40) on the side where the moving body (84) enters. The side wall portion (40a1) is connected to the tunnel (8
1) is moved away from the tunnel center line (81a) on the ground extending parallel to the extending direction of the pressure wave reducing structure (40) in a cross section perpendicular to the tunnel center line (81a). the position of the center line (4 0c), so as to coincide with the projection position of the ground (G) of the movable body come entered the tunnel (81) (84) of the running center line (84a), said first Side wall of pressure wave reducing structure (40a1)
The end portion of the side wall portion (40a2) is connected, the side wall portion (40a2) is continuously reduced in diameter along the tunnel extending direction, and the side wall portion (40a2) is not expanded to a general portion. The side wall portion (40) of the pressure wave reducing structure (40)
a3) is connected to form a substantially horn-shaped structure.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a contract which is a first embodiment of the present invention.
It is a figure which shows the structure of the tunnel pressure wave reduction structure which concerns on the required item 1 , FIG.1 (A) is a cross-sectional view near a tunnel well, and FIG.1 (B) is a plane cross-section seen from the upper part near a tunnel well. Are shown respectively.

In the first embodiment shown in FIG. 1, the tunnel pressure wave reducing structure is constructed by forming the cross section of the pressure wave reducing structure 10 provided at the tunnel well of the double-line type tunnel 81 into a predetermined shape. ing.

That is, in the first embodiment shown in FIG. 1, the side wall of the pressure wave reducing structure 10 on the side where the train 84 enters (hereinafter, referred to as "first pressure wave reducing structure side wall"). 10a is perpendicular to the tunnel center line 81a, and is evenly distributed in the direction from the tunnel center line 81a to the first pressure wave reducing structure side wall portion 10a, that is, in the direction from right to left in FIG. It has been moved . Hereinafter, this direction is referred to as "first side wall direction". As shown in FIG. 1B, the tunnel center line 81a is a line extending parallel to the extending direction of the double-line tunnel 81 and a line passing through the center of the ground at the bottom of the tunnel 81.

In the first embodiment shown in FIG. 1, the first pressure
The movement of the wave reducing structure side wall portion 10a in the first side wall direction is
As shown in FIG. 1B, the pressure wave reducing structure 10 extends over the entire extending direction (vertical direction in FIG. 1B).

With the above structure, in the cross section perpendicular to the tunnel center line 81a, that is, in FIG. 1 (A), the center of the pressure wave reducing structure 10 expanded over the entire extending direction as described above. The position of the line 10c is the vertical line of the running center line 84a of the train 84 entering the tunnel.
It coincides with the direction projection position (projection position on the ground G) (see FIG. 1B). That is, the train 84 entering the tunnel first enters the center of the pressure wave reducing structure 10 and then enters the tunnel 81. Here, the train travel center line 84a corresponds to the moving body travel center line.

Next, the operation of the tunnel pressure wave reducing structure ( pressure wave reducing structure 10) of the first embodiment shown in FIG. 1 will be described with reference to FIGS. 2 (A) and 2 (B) show the configuration of the virtual tunnel 91. As shown in FIGS. 2A and 2B, the tunnel 91 has a cylindrical shape with a radius R of 5 m.

The graph of FIG. 3 shows the simulation results of the pressure and the like in the tunnel 91 when the virtual train 94 or 95 is thrust from the end opening of the virtual tunnel 91. FIG. 3A shows a temporal change in the pressure of the air in the tunnel, and FIG. 3B shows a temporal change in the pressure gradient of the air in the tunnel. The pressure gradient is a value obtained by differentiating the pressure with time, that is, a rate of change of the pressure with time. In addition, in FIGS. 3A and 3B, a solid curve indicates a case where the train enters at a position where the distance D from the center line of the tunnel 91 is zero (in the case of the train 94 in FIG. 2B). ) Is shown. In addition, FIG.
In FIG. 3 (B), a broken line curve indicates a case where the train rushes in at a position where the distance D from the center line of the tunnel 91 is R / 2 (when D = R / 2 in the train 95 in FIG. 2 (B)). ) Is shown. In addition, the rush speed of the virtual train 94 or 95 into the tunnel 91 is the speed of the Shinkansen train (30
A value corresponding to 0 km / hour).

As can be seen from the results of the calculation simulations shown in FIGS. 3 (A) and 3 (B), when the train enters at the position of the center line of the tunnel 91, that is, the curve of the broken line, that is, As shown in FIG. 3 (A), the change over time of the air pressure in the tunnel is gentler than in the case where the train enters at a position deviated from the center line of the tunnel 91. Further, in the case where the train enters at the position of the solid line curve, that is, the center line of the tunnel 91, compared to the case where the train enters at the position deviated from the curve of the broken line, that is, the center line of the tunnel 91, FIG. As shown in, the peak value of the pressure gradient of the air in the tunnel is low.

According to the results of conventional studies, when a train enters a tunnel, a micro-pressure wave at the time of entry is radiated to the outside of the tunnel from the tunnel well on the side opposite to the entry side (wave W2 in FIG. 8). Has been confirmed to be proportional to the pressure gradient of the air in the tunnel compressed by the train entry. Pressure wave reducing structure of the first embodiment shown in FIG. 1 (pressure
In the wave reduction structure 10), as shown in FIG. 3 (B), the peak value of the pressure gradient of the air in the tunnel is changed from that of the conventional case (for a double-track tunnel in which a train enters at a position deviated from the center line of the tunnel). It is considered that it is possible to reduce the micro-pressure waves at the time of train entry as compared with the case of the conventional double-track tunnel because it can be made lower than the case).

In the tunnel pressure wave reducing structure of the first embodiment shown in FIG. 1 , the first pressure wave on the train entry side is longer than the distance between the train side wall 81b and the train 84 on the train entry side. Since the distance between the reducing structure side wall portion 10a and the train 84 is larger, when the train enters the tunnel, the inrush wave (wave W3 in FIG. 8) emitted from the tunnel well on the inrush side to the outside of the tunnel Can also be reduced. This has been confirmed by model experiments.

In the first embodiment shown in FIG. 1 , the position of the center line 10c of the pressure wave reducing structure 10 coincides with the position of the running center line 84a of the train 84 entering the tunnel. Although it has been done, it has been confirmed by calculation simulation and the like that it is possible to reduce the micro-pressure wave or the inrush wave even if the position of the center line 10c of the pressure wave reducing structure 10 is other than the above position. It was

That is, as shown in FIG. 4, the distance between the position of the tunnel center line 81a and the vertical projection position of the train running center line 84a is δ, and the distance from the position of the tunnel center line 81a is enlarged. Center line 10 of the pressure wave reducing structure of the broken part
If the distance to the position of c is x, then x is 0.3δ ≦ x
It was found that the effect was obtained in the range of ≤1.7δ. The position where x is 0.3δ is P1, and the position where x is 1.7δ is P.
Therefore, if the position of the center line 10c of the pressure wave reducing structure is set to be in the range between P1 and P2, there is an effect of reducing micro pressure waves or inrush waves. In order to obtain a more remarkable effect of reducing the micro-pressure wave or the inrush wave, the range of x is preferably set to 0.75δ ≦ x ≦ 1.25δ.

The length of the expanded portion of the pressure wave reducing structure in the extending direction (L in FIG. 4) is equal to the inner cross-section of the tunnel in the general part, judging from the calculation results of other simulations. The result has been obtained that the value must be equal to or larger than the radius of the circle that is the area.

FIG . 5 is a diagram showing the structure of another tunnel pressure wave reducing structure . The tunnel pressure wave reduction structure shown in FIG. 5 includes a pressure wave reduction structure 20. In the pressure wave reducing structure 20, the first pressure wave reducing structure side wall portion 20a1 which is the side wall portion on the side where the train 84 enters.
However, the first pressure wave reducing structure side wall portion 20a1 is perpendicular to the tunnel center line 81a and from the tunnel center line 81a.
5 is unevenly moved in the direction toward the right, that is, in the direction from the right to the left in FIG. 5 (first sidewall direction).

Also, the first pressure wave reducing structure side wall portion 20a.
1 is continuously reduced to a curved surface along the tunnel extension direction (direction from the lower side to the upper side in FIG. 5) and is continuous to the side wall portion 20a2 of the unexpanded pressure wave reducing structure in the general portion. To form a substantially horn-shaped structure.

Even if it is constructed as the tunnel pressure wave reducing structure shown in FIG. 5, it is possible to reduce the micro-pressure wave or the rush wave at the time of train entry. In this case, at the entrance / exit position of the pressure wave reducing structure 20, that is, at the position 20a3 in FIG. 5, the distance x to the position of the center line 20c of the pressure wave reducing structure in the enlarged portion is 0.3δ ≦ x ≦ 1.7
The range is δ, preferably 0.75δ ≦ x ≦ 1.25δ
By setting the range to, it is possible to obtain the effect of reducing the micro-pressure wave or the rush wave when the train rushes. The length of the expanded portion 20a1 in the extending direction of the pressure wave reducing structure is
It is necessary to make the value equal to or larger than the radius of the circle having the same area as the inner cross section of the tunnel in the general section.

The tunnel pressure wave reduction structure of the present invention can be realized by other configurations. FIG. 6 shows a second embodiment of the present invention.
3. The tunnel pressure wave reduction structure according to claim 2, which is an embodiment of
It is the figure which showed the structure of manufacture . Tunnel pressure wave reducing structure shown in FIG. 6 has a different pressure wave <br/> reduction structure 30 in the first embodiment described above. This pressure wave reduction structure 3
At 0, the first pressure wave reducing structure side wall portion 30a1 which is the side wall portion on the side where the train 84 enters is perpendicular to the tunnel center line 81a and from the tunnel center line 81a to the first pressure wave reducing structure. Direction toward the object side wall portion 30a1,
That is, it is moved like a key in the direction from the right to the left in FIG. 6 (first side wall direction).

Also, the first pressure wave reducing structure side wall portion 30a.
1 is disposed at a fixed position along the tunnel extension direction (direction from the lower side to the upper side in FIG. 6), and the upper end portion in FIG. 6 has the sidewall portion 30a3 of the pressure wave reducing structure of the general portion which is not enlarged. By connecting to each other discontinuously in a hook shape , a substantially key-shaped horn-like structure is formed. First
A pressure wave reducing structure sidewall portions 30a1, between the side wall portion 30a3 of the pressure wave low <br/> down structures generally portion, are disposed side wall portion 30a2.

Even with the configuration of the second embodiment shown in FIG. 6, it is possible to reduce the micro-pressure wave or the rush wave when the train rushes. In this case, at the entrance / exit position of the pressure wave reducing structure 30, that is, at the position 30a4 in FIG. 6, the center line 30c of the expanded portion of the pressure wave reducing structure.
The distance x to the position is set in the range of 0.3δ ≦ x ≦ 1.7δ, and preferably in the range of 0.75δ ≦ x ≦ 1.25δ. A reduction effect can be obtained. The enlarged portion 30
The length of the pressure wave reducing structure a1 in the extending direction needs to be equal to or larger than the radius of the circle having the same area as the inner cross section of the tunnel in the general portion.

The tunnel pressure wave reduction structure of the present invention can also be realized by a configuration other than the above. Figure 7
A tunnel according to claim 3, which is the third embodiment of the present invention.
It is the figure which showed the structure of the pressure wave reduction structure . The tunnel pressure wave reduction structure shown in FIG. 7 is the same as the first embodiment or
The pressure wave reducing structure 40 different from that of the second embodiment is provided. In this pressure wave reducing structure 40, the train 8
The first pressure wave reducing structure side wall portions 40a1 and 40a2, which are the side wall portions on the side where 4 enters, are connected to the tunnel center line 81.
perpendicular to a and from the center line 81a of the tunnel to the first pressure
The direction toward the side wall portions 40a1 and 40a2 of the force wave reducing structure, that is, the direction from right to left in FIG. 7 (first
It has been partially moved in the side wall direction).

Also, the first pressure wave reducing structure side wall portion 40a.
1 is arranged at a fixed position along the tunnel extending direction (the direction from the lower side to the upper side in FIG. 6), and is connected to the first pressure wave reducing structure side wall portion 40a2 at the upper end portion in FIG. In addition, the first pressure wave reducing structure side wall portion 40a
2 has a substantially horn-like structure formed by continuously reducing the diameter in a plane along the tunnel extension direction and connecting to the side wall portion 40a3 of the unexpanded general portion of the pressure wave reducing structure. ing.

Even if it is configured as the embodiment shown in FIG. 7,
It is possible to reduce micro-pressure waves or rush waves when a train rushes. In this case, at the entrance / exit position of the pressure wave reducing structure 40, that is, the position 40a4 in FIG. 7, the distance x to the position of the center line 40c of the pressure wave reducing structure in the enlarged portion is set to 0.3δ ≦ x ≦ 1.7δ,
Preferably, by setting the range of 0.75δ ≦ x ≦ 1.25δ, it is possible to obtain the effect of reducing the micro-pressure wave or the inrush wave at the time of train entry. The enlarged portion 40a1,
The length of the pressure wave reducing structure 40a2 in the extending direction needs to be equal to or larger than the radius of a circle having an area equal to the inner cross section of the tunnel in the general portion.

The present invention is not limited to the above embodiments. Each of the above embodiments is an exemplification, has substantially the same configuration as the technical idea described in the scope of claims of the present invention, and has the same operational effect,
Anything is included in the technical scope of the present invention.

For example, in the above description, a train such as a Shinkansen train has been described as an example of a moving body, but the present invention is not limited to this, and a moving body that rushes into a double-track tunnel at high speed can be used. It may be of any type, and may be another moving body such as a magnetic levitation railway train, another type of levitation railway train, or a high-speed automobile.

In each of the above embodiments, the first pressure
Power wave reducing structure side wall portion (10a , 30a1, 40a1,
40a2) was moved such that the cross section was perpendicular to the tunnel center line (81a) and expanded in the first side wall direction from the tunnel center line to the side wall of the first pressure wave reducing structure. Although an example has been described, the present invention is not limited to this and may have another configuration. For example, the cross section of the first pressure wave reducing structure side wall may be enlarged in the first side wall direction.
The second pressure wave reducing structure side wall portion (10b in FIG . 1 , FIG. 6) that is the side wall portion of the pressure wave reducing structure that is on the side opposite to the first pressure wave reducing structure side wall portion while moving . 30b in the 40b) in FIG. 7 to move to the second side wall direction from the first side wall direction is the reverse direction, and the amount of movement of the first pressure wave reducing structure sidewall portion second pressure wave reducing structure sidewall Part of
It may be set larger than the movement amount.

Further, in each of the above-mentioned embodiments, an example in which the side wall portion of the pressure wave reducing structure (10 , 30, 40) is a plane which stands vertically from the ground or the like has been described. The present invention is not limited to this and may have other configurations. For example, the side wall portion of the pressure wave reducing structure (10 3, 30, 40) may have a curved surface shape that is erected from the ground or the like.

Further, in each of the above-mentioned embodiments, an example in which the pressure wave reducing structure (30, 40) has a substantially horn shape has been described, but the present invention is not limited to this. The configuration may be. In short, the side wall portion of the expanded portion of the pressure wave reducing structure is appropriately reduced in diameter along the tunnel extending direction, and the side wall portion of the unexpanded general portion of the pressure wave reducing structure is continuous or Any configuration may be used as long as it is configured to have a substantially horn shape by connecting discontinuously.

Further, the pressure wave reducing structure (10 , 30, 40,
1) or a plurality of openings (11a and 11b in FIG . 1, 31a and 31b in FIG . 6 , 41a and 41b in FIG. 7) are formed by cutting off the side wall and / or the ceiling of (0). You may do it. This makes it possible to appropriately adjust the effect of reducing the micro pressure wave or the rush wave when the train rushes.

When the above-mentioned opening is provided on the side surface of the pressure wave reducing structure (10 , 30, 40), the side opening and the movement of the moving body such as a train plunge into the side opening. It is desirable to keep the distance from the body running center line. The first reason is that when the distance between the side surface opening and the moving body that enters is large, the effect of reducing the micro-pressure waves is less likely to be affected by the shape of the moving body, and various types of vehicles run. This is because the current Shinkansen is convenient. The second reason is that the pressure wave (rush wave) emitted to the outside from the side surface opening is smaller when the moving body rushes in, when the distance between the side surface opening and the moving body that rushes is larger. is there. From this, if the method of the present patent application is adopted, it is possible to separate the distance between the opening portion on the side surface of the pressure wave reducing structure and the moving body running center line on which the moving body enters. It is very effective both in reducing micro atmospheric pressure waves and in inrush waves.

Further, the opening shape of the opening formed as described above may be a slit shape elongated in any direction. That is, the extending direction of the slit-shaped opening is parallel to the tunnel extending direction (the extending direction of the tunnel center line 81a in FIG. 1 and the like) at the side wall portion or the ceiling portion of the pressure wave reducing structure (10 , 30, 40). a direction or a direction perpendicular to the tunnel extending direction of the side wall or the ceiling of the pressure wave reducing structure (circumferential direction of the pressure wave reducing structures), or a tunnel in the side wall portion or a ceiling portion of the pressure wave reducing structure It is a direction intersecting with the extending direction at an arbitrary angle.

The width of the short side of the slit-shaped opening formed as described above may change continuously or discontinuously in the longitudinal direction of the slit. That is, in addition to the elongated rectangular opening, this slit-shaped opening is an elongated elliptical opening, an elongated rhombus-shaped opening, an elongated gourd-shaped opening, an elongated “I” -shaped opening, and an elongated “+”-shaped opening. Various openings are included.

Further, the tunnel pressure wave reducing structure of the present invention may be constructed by combining the pressure wave reducing structure described in the present specification with the entrance portion of the tunnel lining. For example, in FIG. 7, the portion 40a1 may be a structure provided outside the tunnel, and the portions 40a2 and 40a3 may have a shape of the tunnel lining inward from the entrance of the tunnel as shown in FIG. .

[0046]

As described above, according to the first aspect of the present invention.
Tunnel pressure wave reducing structure according to is a tunnel pressure wave reducing structure constructed by multi-track tunnel (81) a pressure wave reducing structure provided in the tunnel wellhead of (10) with a predetermined shape, In the pressure wave reducing structure (10), a first pressure wave reducing structure side wall portion (10a), which is a side wall portion on the side where the moving body (84) enters,
On the ground extending parallel to the extension direction of the tunnel (81)
Move away from the tunnel center line (81a) ,
The movement of the first pressure wave reducing structure side wall portion (10a) is forward
As throughout the extended設方direction of serial pressure wave reducing structure (10), perpendicular transverse to the tunnel centerline (81a)
Oite the surface, the pressure wave reducing structure centerline (10)
Since the position of (10c) is made to coincide with the projection position of the running center line (84a) of the moving body (84) entering the tunnel (81) onto the ground (G), the moving body enters It has an advantage that the micro pressure wave or the inrush wave can be reduced. In addition, claim 2 of the present invention
The tunnel pressure wave reduction structure according to (1) is a tunnel pressure wave reduction structure configured by forming a pressure wave reduction structure (30) provided at a tunnel well of a double-line tunnel (81) into a predetermined shape, Of the pressure wave reducing structure (30), a first pressure wave reducing structure side wall portion (30a1) that is a side wall portion on the side where the moving body (84) enters.
Is a ground extending parallel to the extension direction of the tunnel (81).
Moving <br/> away from the tunnel centerline (81a) on the surface, in the cross section perpendicular to the tunnel center line (81a), the center line (3 0 of the pressure wave reducing structure (30)
The position of c) is made to coincide with the projection position of the running center line (84a) of the moving body (84) entering the tunnel (81) onto the ground (G), and the first pressure wave reducing structure is provided. The end portion of the object side wall portion (30a1) and the side wall portion (30a) of the pressure wave reducing structure (30) in the general portion which is not enlarged.
By arranging the side wall part (30a2) between the end part of the first pressure wave reducing structure side wall part (30a1).
Part is discontinuously connected to the side wall part (30a3) of the pressure wave reducing structure (30) of the unexpanded general part,
Since the hook-shaped horn structure is formed, there is an advantage that the micro-pressure wave or the rush wave at the time of the entry of the moving body can be reduced. Further, claim 3 of the present invention
The tunnel pressure wave reduction structure according to (1) is a tunnel pressure wave reduction structure configured by forming a pressure wave reduction structure (40) provided in a tunnel well of a double-track type tunnel (81) into a predetermined shape, Of the pressure wave reducing structure (40), a first pressure wave reducing structure side wall portion (40a1) that is a side wall portion on the side where the moving body (84) enters.
Is a ground extending parallel to the extension direction of the tunnel (81).
Moving <br/> away from the tunnel centerline (81a) on the surface, in the cross section perpendicular to the tunnel center line (81a), the center line (4 0 of the pressure wave reducing structure (40)
The position of c) is made to coincide with the projection position of the running center line (84a) of the moving body (84) entering the tunnel (81) onto the ground (G), and the first pressure wave reducing structure is provided. The end portion of the object side wall portion (40a1) is replaced with the side wall portion (40a2).
And the side wall portion (40a2) is continuously reduced in diameter along the tunnel extending direction, and the side wall portion (40a2)
Since the side wall portion (40a3) of the pressure wave reducing structure (40) in the general portion which is not enlarged is connected to form a substantially horn-shaped structure, It has an advantage that the inrush wave can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a tunnel pressure wave reduction structure that is a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the operation of the tunnel pressure wave reduction structure of the present invention.

FIG. 3 is a diagram for explaining the operation of the tunnel pressure wave reduction structure of the present invention.

FIG. 4 is a diagram for explaining the operation of the tunnel pressure wave reduction structure of the present invention.

[5] There <br/> a diagram showing a configuration of another tunnel pressure wave reducing structure.

FIG. 6 is a diagram showing a configuration of a tunnel pressure wave reduction structure that is a second embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a tunnel pressure wave reduction structure that is a third embodiment of the present invention.

FIG. 8 is a diagram illustrating a micro-pressure wave and an inrush wave in a conventional tunnel.

[Explanation of symbols]

Center line 11a of 10 pressure wave reducing structure 10a first pressure wave reducing structure sidewall portion 10b second pressure wave reducing structure sidewall portion 10c pressure wave reducing structures, 11b opening 20 pressure wave reducing structure 20a1 first pressure Wave reduction structure side wall 20a2 General side wall 20a3 Entrance / exit position 20b Second pressure wave reduction structure side wall 20c Pressure wave reduction structure centerlines 21a, 21b Opening 30 Pressure wave reduction structure 30a1 First pressure wave Reduction structure side wall 30a2 Side wall 30a3 General side wall 30a4 Entrance / exit position 30b Second pressure wave reduction structure side wall 30c Pressure wave reduction structure center lines 31a, 31b Opening 40 Pressure wave reduction structure 40a1, 40a2 the first pressure wave reducing structure sidewall portions 40a3 general side wall portion 40a4 entrance position 40b second pressure wave reducing structure sidewall portion 40c pressure wave reducing structure of Object center lines 41a, 41b Opening 80 Rock 81 Tunnel 81a Tunnel center line 81b Tunnel side wall 84 Train 84a Train running center line (moving body running center line) 91 Virtual tunnel 94, 95 Virtual train a-d Peak value of pressure D Distance E1, E2 Tunnel entrance / exit end G Ground L Length P1, P2, P11 Position R Radius W1 Pressure wave W2 inside the tunnel Micro pressure wave W3 Inrush wave x Distance δ distance

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-125706 (JP, A) JP-B-53-40259 (JP, B2) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21F 1/00 E21D 9/14

Claims (3)

(57) [Claims] 1. A tunnel pressure wave reduction structure configured by forming a pressure wave reduction structure (10) provided in a tunnel well of a double-track tunnel (81) into a predetermined shape, wherein the pressure wave reduction is performed. Of the structure (10), the moving body (84)
The first pressure wave reducing structure sidewall portion but a side wall portion of the coming enters the side of (10a), said tunnel (81) ground on the tunnel center line extending parallel to the extending direction from (81a)
Go way away, to the first pressure wave reducing structure sidewall portions movement (10a) as throughout the extended設方direction of the pressure wave reducing structure (10), the tunnel centerline (81a) Te placed <br/> perpendicular cross-section, the pressure wave reducing structure (10) center line of the (1 0c)
Of the moving body (84) entering the tunnel (81) to the projection position on the ground (G) of the traveling center line (84a) of the moving body (84) into the tunnel (81). Construction. 2. A tunnel pressure wave reduction structure configured by forming a pressure wave reduction structure (30) provided at a tunnel well of a double-track type tunnel (81) into a predetermined shape, wherein the pressure wave reduction is performed. Of the structures (30), the moving body (84)
The first pressure wave reducing structure side wall portion (30a1), which is the side wall on the side where the tunnel enters, is the tunnel center line (81a) on the ground extending parallel to the extending direction of the tunnel (81) .
Moves away al, the tunnel centerline in cross section perpendicular to (81a), said pressure wave reducing structure (30) center line of (3 0c)
Is aligned with the projection position of the traveling center line (84a) of the moving body (84) entering the tunnel (81) onto the ground (G), and the side wall of the first pressure wave reducing structure. The end portion of the portion (30a1) and the side wall portion (30a3) of the pressure wave reducing structure (30) in the general portion which is not enlarged.
By disposing the side wall portion (30a2) between and, the end portion of the first pressure wave reducing structure side wall portion (30a1) is
The pressure wave reducing structure (3
Discontinuously connected to the side wall of 0) (30a3), approximately key
Tunnel pressure wave reducing structure, characterized by forming the shape horn-like structure. 3. A tunnel pressure wave reduction structure configured by forming a pressure wave reduction structure (40) provided at a tunnel well of a double-track tunnel (81) into a predetermined shape, wherein the pressure wave reduction is performed. Of the structure (40), the moving body (84)
The first pressure wave reducing structure side wall portion (40a1), which is the side wall on the side where the tunnel enters, is the tunnel center line (81a) on the ground extending parallel to the extending direction of the tunnel (81) .
Moves away al, the tunnel centerline in cross section perpendicular to (81a), the center line of the pressure wave reducing structure (40) (4 0c)
Is aligned with the projection position of the traveling center line (84a) of the moving body (84) entering the tunnel (81) onto the ground (G), and the side wall of the first pressure wave reducing structure part end of the (40a1)
Is connected to the side wall portion (40a2), and the side wall portion (40a2)
2) is continuously reduced in diameter along the tunnel extension direction,
A tunnel pressure wave, characterized in that the sidewall portion (40a2) is connected to the sidewall portion (40a3) of the unexpanded general portion of the pressure wave reducing structure (40) to form a substantially horn-shaped structure. Reduced structure.