JP3411974B2 - Tunnel ventilation equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation device for ventilating an automobile tunnel, and more particularly to a ventilation device in which an axial fan such as a jet fan or a booster fan is installed in the tunnel.

[0002]

2. Description of the Related Art Conventionally, when a ventilation fan such as a jet fan or a booster fan is installed in an automobile tunnel, the fan is suspended from the upper part of the tunnel. Specifically, a concrete anchor is driven into a concrete wall on the ceiling of a tunnel or a concrete plate provided on the ceiling, and a hanging metal fitting is attached to this anchor. Then, the hanging fitting and the hanging ear formed on the jet fan or the booster fan are connected by a turnbuckle. At that time, the length of the turnbuckle is selected and adjusted so that the lower ends of the jet fan and booster fan do not exceed the building limit. An example of this is described in JP-A-11-23032. In addition, the standards for installing jet fans and booster fans are stated in the Ministry of Construction's common specifications for mechanical work (draft), the guide for designing tunnel ventilation equipment at the Expressway Technology Center, and the Japan Road Public Corporation's common specifications for mechanical work Has been done.

[0003]

Since it is stipulated that fixed installations should not be placed within the building limit set for automobile tunnels, jet fans and booster fans must be installed above this building limit. I have to. Therefore, in the above-described conventional vehicle tunnel ventilation device, the opening height of the tunnel is increased in order to secure the installation space for the jet fan and the booster fan above the building limit. As a result, there was a problem that the tunnel excavation amount increased. Especially when the fan is enlarged to increase the exhaust capacity of the ventilation system,
This increase in the amount of excavation is remarkable.

It is an object of the present invention to realize a tunnel ventilation system in which the excavation amount of the tunnel is reduced while the construction limit of the automobile tunnel is secured.

[0005]

[Means for Solving the Problems]

[0006] Features of the present invention for achieving the above object is a tunnel ventilation apparatus installed in a tunnel the vehicle is traveling, at least one of the jet fan or a booster fan, the suction side of the fan An air intake path having a suction port that is open to the ground and that communicates with the discharge side of the fan is provided, and a sound absorbing material is provided on the inner wall surfaces of the air intake path and the exhaust path. Is formed in the ground.

[0007] Then, in the above Kitoku symptoms, to at least one of the ground side of the suction port and the discharge port, it is desirable to attach a silencer. Further, intake sounds material may be provided a plurality of locations at intervals with respect to the running direction of the vehicle.

Further, in any case, a sensor for recognizing an object is provided near at least one of the suction port and the discharge port, and a control means for adjusting the air volume of the fan when the sensor recognizes a vehicle or a person is provided. Is desirable.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an automobile tunnel according to the present invention, and FIG. 2 is a cross-sectional view taken along the line AA. In a tunnel for automobiles, an automobile running road surface having four or more lanes and one lane or more and one lane in total in a small tunnel is formed. And in addition to this road surface, on both sides of the road surface for the purpose of evacuation or road surface protection,
A shoulder and an emergency parking zone 3 are provided. In normal driving, the road shoulder and the emergency parking zone 3 are secured as an empty space.

By the way, in the tunnel 1 for an automobile, a construction limit 2 is virtually defined on the inner surface of the excavated semicircular inner wall. The construction limit 2 defines the limit of vehicles that can travel and the installable range of equipment required for maintenance and inspection in the tunnel, and is set for each tunnel. It is clear that the construction cost of the tunnel will be reduced if the inner wall of the tunnel is brought close to the building limit 2. However, as mentioned above, ventilation equipment is installed in the central part of the tunnel to promote ventilation in the tunnel. It was located above.

Therefore, in the present invention, ventilation equipment is provided underground or underground to bring the building limit 2 of the tunnel 1 close to the inner wall of the tunnel. That is, the road shoulders or the emergency parking zones 3 provided on both sides of the traveling lane are excavated to form the groove 7 having a rectangular cross section. Then, the jet fan or the booster fan 5 is installed in the groove 7. At this time, the jet fan or the booster fan 5 is fixed to the groove 7 by using the fixture 6. A lid is provided at an upper portion of the groove 7 formed on the road shoulder or the emergency parking zone 3 so that earth and sand and the like do not flow into the groove. Further, a suction port 11 and a discharge port 10 formed in a grating or mesh shape are provided in a place where the influence of the vehicle is small even if the vehicle stops.

As shown in FIG. 2, an inclined portion 8 is formed in the groove 7 in the vicinity of the suction port 11 and the discharge port 10, and a portion where the jet fan and the booster fan 5 are installed from the inclined portion 8. Are connected by a duct 9. The duct 9 may have the same shape as the groove 7. If the groove 7 and the duct 9 have substantially the same shape in this manner, there is no need to have a special shape, and the construction cost can be reduced.

In the ventilator of this embodiment thus formed, the exhaust gas discharged from the traveling automobile is sucked in through the suction port 11 and then enters the groove 7 formed on the road shoulder or underground of the emergency parking zone 3. It flows in through the inclined portion 8 and the duct 9 (intake passage). Then, it flows into the fan 5 from the suction side of the silencer case 15 provided at both shaft end portions of the fan 5, and moves by the impeller in the axial flow case 14 inside the fan 5 with the impeller, which is inside the silencer case 15. After being given energy to reduce noise in the silencer case on the discharge side, it is discharged from the discharge port 10 provided near the tunnel exit through the duct 9 and the inclined portion 8 (exhaust path). In this case, it is preferable that the shape of the duct 8 does not have a bend or a sudden change in cross-sectional area so that the loss is reduced.

It should be noted that the suction port 11 and the discharge port 10 are located at a place such as a road shoulder or an emergency parking zone 3 where the vehicle is not affected even when the vehicle stops.
When it is difficult to provide the suction port 11, the suction port 11 and the discharge port 10 are provided near the shoulder of the road. In this case, since the vehicle passes through the upper surfaces of the suction port 11 and the discharge port 10, the sensor 16 for detecting the vehicle is installed on the lower surface of the lid that covers the suction port 11 and the discharge port 10 or in the vicinity thereof. Sensor 16
Is output to the controller of the fan 5, not shown.
When the sensor 16 detects that a vehicle or a person approaches the suction port 11 or the discharge port 10, the suction port 11 or the discharge port 1 is detected.
The controller regulates ventilation air from zero. For example, if the vehicle should stop on the suction port 11 or the discharge port 10, the air volume is adjusted or the fan is stopped according to the stop time. With this configuration, it is possible to prevent unpleasant exhaust gas from being blown to the stopped vehicle for a long time.

In this embodiment, the case where the suction port and the discharge port are provided in the traveling surface has been described. However, when the suction port and the discharge port are provided on the road shoulder and the emergency parking zone, the amount of air sent and discharged is controlled by using the sensor. It goes without saying that you can do it. Further, the air volume adjustment may be an on / off type control, and the air blowing may be stopped when the vehicle is located on the suction port or the discharge port.

According to the above-described embodiment, the groove for installing the jet fan or the booster fan is formed on the road shoulder or the emergency parking zone provided in the tunnel, and the jet fan or the booster fan is arranged in this groove. The secondary lining for installing jet fans and booster fans on the tunnel ceiling is not required. As a result, it is possible to reduce the distance between the building limit widely set when installing the jet fan or the booster fan and the tunnel inner wall surface.
Thereby, the tunnel excavation amount can be reduced and the tunnel construction cost can be reduced. In addition, hanging hardware used to suspend jet fans and booster fans from the ceiling,
Turnbuckles and concrete anchors are not required, and the installation costs of jet fans and booster fans can be reduced. Moreover, since the road shoulders, which have not been used so far, and the underground part are utilized, it is possible to efficiently ventilate the inside of the tunnel without affecting the road running. The discharge port may be provided outside the tunnel. In that case, if a processing unit that processes the ventilation gas is provided between the fan and the discharge port, clean air is discharged to the outside, so that a ventilation device that is friendly to the surrounding environment can be obtained.

FIG. 3 shows a cross sectional view of the second embodiment of the present invention. The embodiment shown in FIG. 3 is different from the embodiment shown in FIG. 1 only in that a sound absorbing material is arranged in the groove 7. Since the other points are the same as those of the embodiment of FIG. 1, description thereof will be omitted. Glass wool or a sound absorbing material 17 having a high sound absorbing effect is attached to the wall surface of the groove 7 in which the jet fan or the booster fan is arranged. Alternatively, the groove 7 itself has a sound absorbing effect. If the groove is formed in this way, the silencer 1 attached to the jet fan or the booster fan 5 will be described.
5 can be shortened. And, it becomes possible to omit the silencer.

According to this embodiment, the silencer structure attached to the jet fan or the booster fan becomes simple or unnecessary, and the manufacturing cost of the jet fan or the booster fan can be reduced. Note that the sound absorbing material is simply provided in the groove, and when the sound absorbing material is installed, the sound absorbing material may be attached to the wall surface of the groove, and the installation is easy. It should be noted that it is also possible to achieve the optimum noise reduction amount by adjusting the thickness of the sound absorbing material 17 or the length in the traveling direction. For example, in consideration of the cost, the sound absorbing material may be provided dispersedly at several points in the traveling direction, or the sound absorbing material may be provided intensively near the entrance and exit.

FIG. 4 shows a vertical sectional view of still another embodiment of the present invention. An example is shown. The present embodiment is different from the above embodiments in that the axial flow case 14 having the impeller and the silencer case 15 are separately arranged. The inclined portion 8 is provided at the end of the groove in which the jet fan or the booster fan is arranged, and the suction port 11 and the discharge port 10 are provided in front of it. A silencer 12 is provided above at least one of the suction port 11 and the discharge port 10. In this case, silencer 1
Since No. 2 is placed on the ground, it is desirable to provide a suction port or a discharge port where it does not interfere with the running of the automobile.
The suction port 11 is not useful unless it is inside the tunnel, but the discharge port does not necessarily have to be provided inside the tunnel, so it may be provided outside the vicinity of the tunnel. By doing so, it is possible to prevent the vehicle from being obstructed.

[0020]

According to the present invention, since the fan is housed in the ground, the tunnel construction limit and the tunnel inner wall distance can be narrowed, and the tunnel construction cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of a tunnel ventilation device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of another embodiment of the tunnel ventilation device according to the present invention.

FIG. 4 is a longitudinal sectional view of still another embodiment of the tunnel ventilation device according to the present invention.

[Explanation of symbols]

1 ... Tunnel ceiling, 2 ... Building limit, 3 ... Shoulder or emergency parking zone, 4 ... Road surface, 5 ... Fan, 6 ... Fixing device,
7 ... Groove, 8 ... Inclined part, 9 ... Duct, 10 ... Discharge port, 11
... Suction port, 12, 13 ... Silencer, 14 ... Axial flow case, 15 ... Silencer case, 16 ... Sensor, 17 ...
Sound absorbing material.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Sho 50-101140 (JP, U) Rikai Hei 7-35598 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) E21F 1/00 F24F 7/06 F24F 7/08

Claims (4)

(57) [Claims] 1. A tunnel ventilation device installed in a tunnel in which an automobile runs, comprising at least one of a jet fan and a booster fan, and a suction port communicating with the suction side of the fan and open to the ground. The intake passage,
An exhaust passage communicating with the discharge side of the fan is provided, and a sound absorbing material is provided on inner wall surfaces of the intake passage and the exhaust passage,
A tunnel ventilation device characterized in that the intake passage and the exhaust passage are formed in the ground. To wherein at least one of the ground side of the suction port and the discharge port, the tunnel ventilation system of claim 1, characterized in that attaching the silencer. 3. The tunnel ventilation device according to claim 1 , wherein the sound absorbing material is provided at a plurality of locations spaced apart from each other in the traveling direction of the vehicle. 4. A sensor for recognizing an object is provided in the vicinity of at least one of the suction port and the discharge port, and a control means for adjusting the air volume of the fan when the sensor recognizes a vehicle or a person is provided. The tunnel ventilation device according to any one of claims 1 to 3 , which is characterized.