JPH04330200A - Structure of tunnel - Google Patents

Abstract

PURPOSE:To suppress rise of internal pressure at the time a train is passing without enlarging the section area of tunnel. CONSTITUTION:Outside of a main tunnel 1 a decompression tunnel 5 is provided in parallel with the constructing direction of the main tunnel l, and this decompression tunnel 5 is furnished with a plurality of conduit pipes 7 in such an arrangement as penetratively tying the cavity 1a of the main tunnel 1 to the cavity 5a of the decompression tunnel 5. This produces an effect to suck the compressed air at the front 10a of a train to its rear 10b when the train 10 passes through the main tunnel 1, and the pressure therein will sink.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tunnel structure for a train tunnel that suppresses a pressure increase in the tunnel when a train passes through the tunnel.

0002

2. Description of the Related Art Conventionally, in train tunnels, the cross-sectional area of the tunnel has been increased in order to suppress the rise in pressure within the tunnel that occurs when a train passes through the tunnel.

0003

[Problem to be solved by the invention] However, as trains become faster in the future due to the adoption of linear motor cars, etc., the pressure inside the tunnel generated when a train passes will further increase, and it is difficult to deal with this using conventional technology. However, there is no choice but to construct a tunnel with an even larger cross-sectional area. This raises problems such as technical measures, safety, long construction periods, and large costs associated with building tunnels with large cross-sectional areas.

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a tunnel structure that suppresses the rise in pressure within the main tunnel without increasing the cross-sectional area of the main tunnel.

[0005]

[Means for Solving the Problems] That is, the tunnel structure according to the present invention has a main tunnel (1), and the main tunnel (1) has a main tunnel (1).
1), a depressurization tunnel (5) is provided in parallel to the construction direction of the main tunnel (1), and the depressurization tunnel (5)
, a plurality of conduits (7) are provided in the tunnel construction direction to communicate the internal space (1a) of the main tunnel (1) and the reduced pressure tunnel internal space (5a) of the reduced pressure tunnel (5). Ru.

[0006] Furthermore, in the above-mentioned main tunnel (1),
The decompression tunnel (5) is provided with an exhaust device for discharging the air in the main tunnel (1) to the outside of the main tunnel (1).

Note that the numbers in parentheses are for convenience to indicate corresponding elements in the drawings, and therefore, this description is not limited to the descriptions in the drawings. The same applies to the "effect" column below.

[0008]

[Operation] With the above-described configuration, the present invention provides a train (10)
When passing through the main tunnel (1), the front part of the train (10
The atmosphere at a) is compressed to become higher than the pressure at the rear of the train (10b), and the compressed high pressure section (10a) at the front of the train (10a)
The air (12) of 12a) is sucked from the conduit (7) into the low pressure section (12d) of the train rear section (10b), which is lower than the pressure at the train front section (10a), and passes through the depressurization tunnel (5). It acts to flow to the outside of the decompression tunnel (5) and to the low pressure part (12d) of the rear part of the train (10b). In addition, the exhaust system forcibly exhausts the air inside the main tunnel (1) to the outside of the main tunnel (1), which acts to actively reduce the pressure inside the main tunnel (1) before the train passes through. .

[0009]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings. FIG. 1 is a diagram showing an example of a tunnel structure according to the present invention, and FIG. 2 is a diagram showing a cross section XX of the tunnel structure shown in FIG.

An example to which the tunnel structure according to the present invention is applied, as shown in FIG. 1, has a main tunnel 1 excavated in a direction perpendicular to the plane of the drawing. It is constructed to withstand 20 degrees of earth and water pressure. The lining 6 consists of an arch 2 covering the side and top surfaces and an invert 3 at the bottom, and is located outside the main tunnel 1 in the ground 20 (
A decompression tunnel 5 is provided in the ground 20 (in the upper part of the figure) parallel to the construction direction of the main tunnel 1 (in a direction perpendicular to the plane of the paper). A plurality of conduits 7 are connected to the reduced pressure tunnel 5 so as to communicate the inner space 1a of the main tunnel 1 and the reduced pressure tunnel inner space 5a of the reduced pressure tunnel 5. That is,
As shown in FIG. 2, the decompression tunnel 5 is parallel to the main tunnel 1 in the ground 20 outside the main tunnel 1 (upper part in the figure).
The conduit 7 communicates the internal space 1a of the main tunnel 1 with the reduced pressure tunnel internal space 5a of the reduced pressure tunnel 5 in the tunnel construction direction (left/right direction in the figure).
A large number of them are provided at predetermined intervals in the horizontal direction in the figure. Although not shown, both ends of the decompression tunnel 5 are open to the atmosphere.

Since the present invention has the above configuration, as shown in FIG. 2, when the train 10 moves inside the main tunnel 1 (in the direction of arrow A in the figure), the atmosphere in the front part 10a of the train is compressed. The pressure becomes higher than the pressure at the rear of the train 10b. Then, the air 12 in the high pressure section 12a compressed in the front section 10a of the train
is sucked in from a plurality of conduits 7 located above the train 10 (upper part in the figure), passes through the decompression tunnel 5, and reaches the front part of the train 1.
It flows from the high pressure section 12a at 0a to the low pressure section 12d at the train rear section 10b, where the pressure is lower than the pressure at the train front section 10a. A part 12b of the air 12 in the decompression tunnel 5 flows in a direction opposite to the train traveling direction (arrow B direction in the figure) and is exhausted outside the decompression tunnel 5, and the other part 12c flows into a plurality of air 12s. It flows through the conduit 7 to the low pressure section 12d of the rear part 10b of the train. As a result, the pressure in the high-pressure section 12a of the train front section 10a in the main tunnel 1 decreases. Therefore, even without increasing the cross-sectional area of the main tunnel 1, by providing depressurization tunnels 5 of the necessary size and number and a plurality of conduits 7 on the outside of the main tunnel 1, it is possible to The compressed air 12 of the train 10a is sucked into the rear part 10b of the train and discharged to the outside, thereby reducing the pressure inside the main tunnel 1. That is, the apparent cross-sectional area of the main tunnel 1 can be increased, which has the same effect as increasing the cross-sectional area of the main tunnel 1, which is the main shaft.

Further, as another example to which the tunnel structure according to the present invention is applied, in the above-mentioned main tunnel 1, a main tunnel 1 is provided at the end or center of the decompression tunnel 5.
If an exhaust device such as a blower or a pump is provided to exhaust the air outside the tunnel 1, the exhaust device can forcefully exhaust the air inside the tunnel 1 to the outside of the tunnel 1. Actively explore the main tunnel 1 before the train passes.
By lowering the pressure inside the main tunnel 1 when the train passes through.
It is possible to suppress the pressure increase inside.

[0012] In the above, the lining of the bottom surface of the main tunnel 1 is inverted 3, but the bottom surface of the main tunnel 1 may be the ground, a cover plate, or the like. Furthermore, the decompression tunnel 5 may be newly constructed or an existing one such as a pilot hole may be used.

[0013]

As explained above, the tunnel structure according to the present invention has a main tunnel 1, and a decompression tunnel 5 is provided outside the main tunnel 1 in parallel to the construction direction of the main tunnel 1. The main tunnel 1 is added to the reduced pressure tunnel 5.
A plurality of conduits 7 are provided in the tunnel construction direction to communicate the internal space 1a of the depressurized tunnel 5 with the decompressed tunnel internal space 5a of the decompressed tunnel 5.

Since the present invention is constructed as described above, when the train 10 passes through the main tunnel 1 (progressing in the direction of arrow A in FIG. 2), the atmosphere in the front part 10a of the train is compressed and the air in the rear part of the train is compressed. The pressure at the front part 10a of the train is higher than that at 10b.
The air 12 in the high pressure section 12a compressed by the train front section 10
It is sucked from the conduit 7 into the low-pressure part 12d of the train rear part 10b, which is lower than the pressure of the train part a, and flows through the decompression tunnel 5 to the outside of the decompression tunnel 5 and to the low-pressure part 12d of the train rear part 10b. As a result, the pressure at the train front section 10a inside the main tunnel 1 decreases. Therefore, without increasing the cross-sectional area of the main tunnel 1, the air 12 in the high pressure part 12a compressed in the front part 10a of the train can be transferred to the low pressure part 12d in the rear part 10b of the train.
The pressure inside the tunnel 1 can be lowered by the suction action.

Furthermore, in the present invention, in the above-mentioned main tunnel 1, an exhaust device is provided in the decompression tunnel 5 to discharge the air in the main tunnel 1 to the outside of the main tunnel 1. By forcibly exhausting the air inside the main tunnel 1 to the outside of the main tunnel 1, the pressure inside the main tunnel 1 is actively lowered before the train passes, and the pressure inside the main tunnel 1 when the train passes is reduced. It can be suppressed.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an example of a tunnel structure according to the present invention.

[Figure 2] Figure 2 is a cross section of the tunnel structure shown in Figure 1 taken along line X-X.
FIG.

[Explanation of symbols]

1...Main tunnel 1a...Inner space 2...Arch 3...Invert 5...Decompression tunnel 5a...Inner space of decompression tunnel 6... Lining 7... Conduit 20...ground

Claims (2)

[Claims] Claim 1: A decompression tunnel is provided outside the main tunnel in parallel with the construction direction of the main tunnel, and the reduced pressure tunnel includes an internal space of the main tunnel and a reduced pressure of the reduced pressure tunnel. A tunnel structure in which multiple conduits are installed in the tunnel construction direction to communicate with the tunnel interior space. 2. The tunnel structure according to claim 1, wherein the decompression tunnel is provided with an exhaust device for discharging air in the main tunnel to the outside of the main tunnel.