JPH04182598A - Tunnel - Google Patents

Abstract

PURPOSE:To improve the safety from the standpoint of strength in a vehicle and a tunnel internal wall as well as to reduce a noise in the tunnel by installing such a member as reducing the extent of external pressure load and sound due to the running vehicle. CONSTITUTION:A plurality of set-bristles 2 are installed in the inner wall of a rigid tunnel wall 1 composed of concrete material. In this connection, such methods may be available in place of this constitution that a plate type grid 3 with a lot of grid holes is installed on the inner wall, or the inner wall is formed with a lot or irregular parts 4b, or this inner wall is covered with a soft wall consisting of soft material. With this constitution, any external pressure load and sound being produced at a time when a vehicle passes through the tunnel are thus reducible.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tunnel designed to reduce external pressure loads and sound caused by traveling vehicles.

[Conventional technology]

As shown in Figure 6, a conventional tunnel has a rigid inner wall surface 1 mainly made of concrete, which prevents the sound emitted by a vehicle A passing through the tunnel at high speed, as well as harmful acoustic noise and pressure. There were no measures or equipment to reduce this.

[Problem to be solved by the invention]

When a high-speed vehicle enters or passes through the conventional tunnel described above,
As pressure increases between the vehicle and the tunnel inner wall, an external pressure load acts on the vehicle structure and the tunnel inner wall, and harmful noise generated from the vehicle is also reflected by the tunnel inner wall.

The magnitude of this external pressure load increases as the speed of passing vehicles increases.

The tendency is that the stiffer the tunnel wall surface, the more the following problems will occur: (1) As the speed of vehicles increases, the vehicle structure must be made stronger in order to withstand the increasing external pressure load, and the structural weight leading to an increase in

(2) As the speed of vehicles increases, larger external pressure loads are repeatedly applied to the inner wall surface of the tunnel, and the tunnel wall must be made stronger in terms of structural strength.

(3) Noxious sounds emitted from vehicles are not reduced.

The present invention seeks to overcome the drawbacks of conventional tunnels mentioned above.

[Means to solve the problem]

In the tunnel according to the present invention, a member is provided on the inner wall surface to reduce the external pressure load and sound caused by traveling vehicles.

[Effect]

The external pressure load and sound emitted by vehicles traveling in the tunnel are reduced on the tunnel inner wall surface, the external pressure load and harmful people are reduced, the external pressure load acting on the vehicle and the tunnel inner wall surface is reduced, and noise is reduced. Ru.

〔Example] A first embodiment of the present invention will be described with reference to FIG.

In this embodiment, flocks 2 are provided on the inner wall surface of a rigid tunnel wall 1 made of concrete.

In this embodiment, the external load and sound S caused by the traveling vehicle that are incident on the inner wall surface of the tunnel are reduced by the flocking 2, and reflected into the tunnel as a weak external load and sound.

A second embodiment of the invention will be described with reference to FIG.

In this embodiment, a flat plate-shaped lattice 3 having a large number of lattice holes 3a is provided on the inner wall surface of a rigid tunnel wall 1 made of concrete.

In this embodiment, the external load and sound S caused by the traveling vehicle enter the space between the inner wall surface of the tunnel wall 1 and the grid 3 through the grid holes 3a, and are thereby repeatedly reflected to reduce their intensity. Furthermore, it is reflected into the tunnel.

A third embodiment of the present invention will be described with reference to FIG.

In this embodiment, a nozzle shape 3b is added to the lattice hole 3a in the second embodiment, and as shown in FIG. In the space between the inner wall surface of the tunnel wall 1 and the lattice 3, they interfere with each other and their strength can be weakened.

A fourth embodiment of the present invention will be described with reference to FIG.

In this embodiment, the inner wall surface of a rigid tunnel wall l made of concrete material is formed with a large number of protrusions 4 (FIG. 4(a)), or the inner wall surface is formed with a large number of sinusoidal unevenness 4a. (FIG. 4(b)).

In this embodiment, the external load of the traveling vehicle and the sound S that are incident on the inner wall surface of the tunnel wall 1 are scattered and reflected by the protrusions 4 or the asperities 4a, and are weakened.

A fifth embodiment of the present invention will be described with reference to FIG.

In this embodiment, a soft wall 5 made of a soft material is coated on the inner wall surface of a rigid tunnel wall 1 made of a concrete material.

In this example, the external load of the traveling axle and the sound S are
External loads and sound absorbed by and reflected into the tunnel can be reduced.

In addition, in the present invention, the respective embodiments described above may be appropriately combined and arranged.

〔Effect of the invention〕

As explained above, the present invention can reduce the external pressure load and sound generated when a vehicle enters or passes through a tunnel, thereby improving safety in terms of the strength of the vehicle and the tunnel wall. This makes it possible to reduce the structural weight of a traveling vehicle and to reduce noise inside the tunnel.

[Brief explanation of drawings]

FIG. 1(a) is a cross-sectional view of the first embodiment of the present invention.
Figure (b) is an enlarged cross-sectional view of a part of the same, Figure 2 (a) is a cross-sectional view of a second embodiment of the present invention, and Figure 2 (with) is an enlarged cross-sectional view of a part of the same. , FIG. 3 is an enlarged cross-sectional view of a portion of the third embodiment of the present invention, and FIGS. 4(a) and (b) are enlarged cross-sectional views of a portion of the fourth embodiment of the present invention, respectively. , FIG. 5 is an enlarged cross-sectional view of a portion of a fifth embodiment of the present invention, and FIG. 6 is a cross-sectional view of a conventional tunnel. l... Tunnel wall, 2... Flocking, 3... Grid, 3a... Grid hole, 3b... Nozzle shape, 4...
・Protrusions, 4a--Irregularities, 5...Soft walls. Agent Patent Attorney Akira Sakama and 2 others No. 1 Showa No. 2 No. 3 No. 41 J (a) (E)) No. 5, No. 6

Claims (1)

[Claims] A tunnel characterized by having a member installed on the inner wall surface to reduce external pressure load and sound caused by traveling vehicles.