JPH01210600A - Impact preventer in tunnel - Google Patents

Abstract

PURPOSE:To prevent the occurrence of impact caused by pressure rise when high-speed vehicles pass by a method in which a shield wall surrounding the passing space of vehicle and having air vents is provided in tunnel and an air escape space is formed between the shield wall and the inner surface of the tunnel. CONSTITUTION:A single or double or more shield wall 4 surrounding the passing space 5 of vehicles 3 and having many air vents 7 is provided in a tunnel 1 and air escape spaces 6 are formed between the shield wall 4 and the inner surface of the tunnel 1. Check valves are set in the vents 7 as needed. When high-speed vehicles 3 pass through the tunnel 1 or when vehicles 3 pass by each other in the tunnel 1, air of raised pressures is allowed to escape through the vents 7 to the spaces 6, thereby preventing the overmuch rise of pressures and weakening impact to be occurred.

Description

Detailed Description of the Invention A1 Objective of the Invention (Field of Industrial Application) The present invention is intended for use in trains, trains, linear motor cars, automobiles,
The present invention relates to an impact prevention device in a tunnel that prevents the air pressure in the tunnel from rapidly increasing and impacting the vehicle when another high-speed vehicle passes through the tunnel.

(Prior Art) At present, technological innovations in speeding up vehicles, especially railway vehicles, are remarkable, and linear motor cars and the like have become capable of practical running at speeds exceeding 500 W per hour. However, high-speed vehicles not only cause pollution such as noise and vibration to residents living along the route, but also cause the air inside the tunnel to be rapidly compressed when vehicles pass through the tunnel or when vehicles pass each other in the tunnel. Since FBI k-waves are generated, there are problems in that the vehicle is affected by this and vibrates, becomes unstable, and causes discomfort to passengers. We have invented a method for preventing impact noise in high-speed train tunnels, as described in Publication No. 5B-40259, which involves arranging a cover on the entrance side of the tunnel that gradually reduces the opening ratio of the air outlet.
When a train enters this covering, the air inside the tunnel is gradually pressurized and its flow is caused.
This system allows a train to enter a tunnel and prevents impact noise from being generated at the exit of the tunnel.

(Problem M to be solved by the invention) However, in this method, the air expelled to the outside by a vehicle that has entered the tunnel bounces off the inner wall of the tunnel and gives a strong impact to the vehicle. Vehicles passing each other in the tunnels would shake violently, making the ride unstable, making the ride uncomfortable for passengers, and putting strong pressure on their eardrums, causing discomfort.

The present invention has been made in order to solve the above-mentioned conventional problem, and when a vehicle passes through a tunnel or when vehicles pass each other in a tunnel, the air removed by the vehicle is released into the ventilation space to improve the passage space. The object of the present invention is to provide a device that prevents the vehicle from returning to the tunnel and prevents impact acting on the vehicle inside the tunnel.

1. Structure of the Invention (Means for Solving the Problem) The means of the present invention for achieving the above object is to provide a shielding wall surrounding a vehicle passage space inside a tunnel, and to connect this shielding wall and the inner wall of the tunnel. An impact prevention device for a tunnel, characterized in that an air escape space is present between the tunnel and the vehicle passage space, and the air escape space and the above-mentioned vehicle passage space are communicated with each other through air escape holes scattered in the shielding wall. This device may be equipped with a check valve in the air vent that is installed in the barrier wall to communicate the vehicle passage space and the air escape space to prevent air from returning from the air escape space to the traffic space. The above-mentioned '! The shielding wall at location A is to form an escape space between the vehicle passage space and the inner wall of the tunnel, so it should be made of steel, concrete, or other materials that can withstand air pressure and do not cause vibration. They are formed in a gate shape, arch shape, etc. that provides the necessary strength, and the number of them is basically one, but if necessary, they can be installed in two or more layers to create a multi-layered escape space. This shielding wall has ventilation holes scattered on its side walls and ceiling, and these ventilation holes communicate the above-mentioned vehicle passage space with the ventilation space, and the shape of the ventilation holes is as follows. , circles, ovals, squares, rectangles, and polygons that are easy to form and allow air to circulate.

The pond should be selected and used, and the open area ratio should be within the range of 30 to 80%, approximately 40% for an open type without a check valve, and 70% or more for a pond with a check valve. If it is too small, the air velocity will be too slow, and if it is too large, there will be problems in maintaining the strength of the shielding wall, so it should be in the range of 200 to 10.0 OOci.If it is an open type, the air returns quickly. Set the holes to about 200 to 2,000, -n,
3,000 because the non-return type prevents air from returning.
~10,000 (set to about n).

The reverse valve provided in this vent hole is attached to the vent hole by a valve shaft, closed by a spring, and opened by air pressure, or one end is hinged to a shielding wall and closed by gravity.
It is opened by air pressure, and with this hinge type, on the side wall side, if the hinge side is facing up, the check valve will open and close due to gravity even if it is reversed, but on the ceiling side, when it is opened and reversed, it will close due to gravity. Since it cannot be closed, a closing spring is engaged, or opening is restricted by a stopper so that it does not turn over, and gravity closes.

(Function) The @ strike prevention device in the tunnel configured as described above is
When a vehicle traveling at high speed enters the traffic space, the air in the ventilation hole space is pressurized by the vehicle and escapes from the ventilation hole in the shielding wall to the ventilation space, and is retained in this space to prevent backflow into the traffic space. Therefore, almost no shock waves are generated within the tunnel, and therefore passing vehicles are not subjected to shocks that affect running or riding comfort. Furthermore, if a check valve is installed in the above-mentioned escape hole of the shielding wall, the air that escaped from the escape hole to the escape space will be completely prevented from flowing backwards, so that the impact on the vehicle will be almost imperceptible. It is something that attenuates.

(Example) An example of the implementation of the impact prevention device in the tunnel according to the present invention will be explained based on the drawings.

In FIGS. 1 to 5, reference numeral 1 denotes a well-known tunnel, and a track 2 is laid at the lower part of the inner side of the tunnel, and a vehicle 3 is driven on this track 2.

Reference numeral 4 denotes a shielding wall provided in the aforementioned tunnel 1 to surround the passage space 5 for vehicles 3, and is formed in a gate shape as shown in Fig. 1, or in a similar shape to the tunnel 1 although it is not shown in the drawing. and an escape space 6 between the outside and the inside of the tunnel.
The shielding wall 4 is formed into a double layer as shown in FIG. 3 or a triple layer as shown in FIG. It is also possible to measure the improvement of effectiveness.

Reference numeral 7 denotes air escape holes provided at various locations in the aforementioned shielding wall 4, rectangular ones with a cross-sectional area of about i,ooo- are formed with an aperture ratio of about 40% as shown in FIG. Air escape hole 7
This allows the vehicle passage space 5 and the air escape space 6 to communicate with each other.

Reference numeral 8 designates a conventionally known check valve attached to the shielding wall 4, and as shown in FIGS. 5 and 6 of the drawings, it is attached to the vent hole 7 by a valve shaft 9 and closed by a spring 10 as shown in FIG. Leave it there,
Either open it against the spring 10 by increasing the air pressure, or attach the hinge 11 to the shielding wall 4 inside the ventilation hole 7 as shown in FIGS. 7 to 9, and the side wall side is hinged as shown in FIG. 8. The 11 side is the top end, and the ceiling side is the hinge 1 on either the left or right end in Figure 9.
1 side, which is closed by gravity and opened when air pressure increases.In this case, the side wall side is closed by gravity even if the check valve 8 is opened and reversed, but the ceiling side is closed by gravity when the check valve 8 is opened and reversed. Since the opening limit member 12 prevents opening and reversal, it is possible to close the opening due to gravity.

A closing spring (not shown) may be used instead of the opening limiting member 11 described above.

Reference numeral 13 denotes a worker management passage provided on both sides of the lower part of the above-mentioned escape space 6, which is separated from the passage space 5 for the vehicle 3 by the shielding wall 4, so that when the vehicle 3 passes, even if the worker is in this passage, It is safe and the vehicle 3 can enter and exit the passage space 5 from the management passage 13 through the entrance 1 which is opened and closed by a door 14 provided in the shielding wall 4 and having an air vent 7, as shown in FIG.
This is done from 5.

Next, the results of a model experiment to examine the effects of impact on vehicles in tunnels employing the device according to the present invention and in conventional tunnels will be explained.

Conventionally, a tunnel and a vehicle model are formed so that the ratio of the cross-sectional area of a tunnel to the cross-sectional area of two vehicles is 5:2, and even with the present invention, the tunnel and vehicle model have the same area ratio. A shielding wall with an area equal to the space for two vehicles plus a small amount of extra space is provided in the tunnel, and an air escape space is formed between this and the tunnel, and this air space is connected to the vehicle. The passage space was communicated through an open air vent provided in the shielding wall with an open area ratio of 40%.

In the conventional tunnel model described above and the tunnel model adopting the present invention, two vehicle models were each installed for a length of 100 m.
/S, at a speed of 360 km/h (converted to 360 km/h), the vehicles passed each other in the tunnel, and the pressure increase in the passage space was measured at approximately the center of the tunnel.

As a result, conventional tunnel...0.35kg f 7'
ci Tunnel adopting the present invention...0.03kg f/
It was ai+.

In addition, in a tunnel model employing the present invention, a check valve was installed in the air escape hole of the blocking wall, and as a result of running the vehicle model under the same conditions as above, the impact pressure was 0.01 kgf/C-. .

The above experimental results show that even with the open vent hole of the present invention, the pressure rise generated in the passage space is suppressed to about 1/12 compared to a conventional tunnel, and with the vent hole equipped with a check valve, the pressure rise is reduced to 1/35. It has been demonstrated that the reduction in

C1 Effects of the Invention As described above, the present invention allows trains, electric trains, linear motor cars, automobiles, and other high-speed vehicles to pass through a tunnel or rub against each other in the tunnel, and the air whose pressure increases as a result of this passes through the escape hole of the shielding wall. Because the air is released into the escape space, the pressure rise is suppressed and the shock applied to the vehicle becomes weak, so the vehicle can run stably in the tunnel without vibrations, improving ride comfort.

If a check valve is provided in the air escape hole, the air that has escaped into the air escape space is completely prevented from returning, thereby further improving the impact prevention effect.

It has the following unique effects.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the apparatus according to the present invention. Figure 2 is a longitudinal sectional side view of the same as above. FIGS. 3 and 4 are longitudinal sectional front views showing other embodiments of the same as the above, in which FIG. 3 shows a double arrangement of barrier walls, and FIG. 4 shows a triple arrangement. FIG. 5 is a longitudinal sectional front view showing an example of the same device equipped with a check valve. FIG. 6 is an enlarged sectional view of the same as above. FIG. 7 is a longitudinal sectional front view showing another embodiment of the check valve equipment. FIG. 8 is an enlarged sectional view of the side wall side of the same as above. Figure 9 is an enlarged sectional view of the ceiling side. FIG. 10 is an enlarged partial sectional view showing the entrance to the through hole space provided in the shielding wall. In the figure, 1- is a tunnel, 3 is a vehicle, 4 is a shielding wall, 5 is a passage space, 6 is an isolated space, 7 is an air escape hole, 8
is a check valve. early smell

Claims (2)

[Claims] (1) A shielding wall surrounding the vehicle passage space is provided inside the tunnel, and an air escape space is provided between the shield wall and the inner wall of the tunnel, and the air escape space and the vehicle passage space are separated from each other. A shock prevention device in a tunnel, characterized in that the barrier wall is communicated with through escape holes scattered throughout the barrier wall. (2) The above-mentioned shielding wall is equipped with a check valve that prevents air from returning from the ventilation space to the passage space in the ventilation hole that communicates the vehicle passage space with the ventilation space. A shock prevention device in a tunnel according to claim 1.