JP4037305B2 - Air curtain device for tunnel construction - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air curtain device for tunnel construction that prevents dust from diffusing in the vicinity of a tunnel face during excavation.
[0002]
[Prior art]
At the tunnel construction site, dust generated near the face is sucked from the exhaust pipe and sent to the dust collector, where it is separated and removed by the dust collector.
Then, the exhaust pipe and the exhaust pipe provided in the dust collector and the inlet and outlet of the intake pipe are set in a predetermined direction and position, and clean air is blown to the tunnel wall surface to counter-flow from the wall surface. There is a technique in which an air curtain of a circulating flow formed by the above is formed as a blocking surface (see Patent Document 1).
There is also a technique in which an air curtain is formed using a blower different from the dust collector and ejecting fresh air in a radial direction from a header provided in the air supply pipe so as to close the tunnel mine (see Patent Document 2). ).
[0003]
In addition, a technique has been implemented in which a large number of horizontal holes are formed in the exhaust pipe of the dust collector and an air curtain is formed using the air blown from the holes.
[0004]
[Patent Document 1]
Japanese Patent Publication No. 6-89640 [Patent Document 2]
JP-A-2002-349199 [0005]
[Problems to be solved by the invention]
However, with the above-described conventional technology, although a certain amount of effect is obtained, the amount of air to be ejected is large, so that dust is wound up to cause new dust generation, or since the blowing is in a certain direction, a blind spot can be made, There was a problem that there were many air leaks.
[0006]
An object of the present invention is to effectively prevent diffusion of dust by forming a necessary and sufficient air curtain using an air flow sucked by a dust collector in the vicinity of a tunnel face.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, the invention according to claim 1 is located on the upper side in the tunnel, for example, as shown in FIG. 1, in the intake pipe 5 for sucking the air near the face of the tunnel to the dust collector 4. The horizontal pipe portion 62 having a large number of air holes 62a that extend in the horizontal direction and open up and down, and the large number of air holes 61a and 63a that are positioned on both the left and right sides in the tunnel and extend in the vertical direction and open in the left and right directions. And a tunnel-type air curtain device configured by connecting a gate-shaped air duct 6 through which a part of the suction air in the intake pipe 5 flows.
[0008]
According to the first aspect of the present invention, a part of the air flow sucked into the intake pipe by the dust collector flows in the gate-shaped air blow pipe, and is opened at the top and bottom of the horizontal pipe portion located on the upper side in the tunnel. Air blows out from the blow holes and blows out from a large number of blow holes opened to the left and right of the vertical pipe portions located on the left and right sides in the tunnel. This makes it possible to form an air curtain that is necessary and sufficient for blocking dust, while using the air flow sucked by the dust collector near the tunnel face, with no dust winding up, no blind spots, and little air leakage.
[0009]
The invention according to claim 2 is the air curtain device for tunnel construction according to claim 1, for example, as shown in FIG. A partition wall 53 is provided for guiding the air into the blast pipe 6.
[0010]
According to the second aspect of the present invention, a part of the air flow sucked into the intake pipe is positively guided into the gate-shaped blower pipe by the partition wall provided in the intake pipe.
[0011]
The invention according to claim 3 is the tunnel construction air curtain device according to claim 1 or 2, wherein, for example, as shown in FIG. It is characterized by being fixed to the carriage 3 on which is mounted.
[0012]
According to the third aspect of the present invention, since the gate-shaped blast pipe is fixed to the carriage on which the dust collector is mounted, the air curtain device moves together with the dust collector-mounted carriage.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 1 is an air supply pipe, 2 is a rail, 3 is a general truck, 4 is a dust collector, 5 is an intake pipe, 6 is a portal-shaped air duct, 61 and 63 are vertical pipe sections, 62 is a horizontal pipe section, 61a, 62a and 63a are blower holes.
[0014]
In the tunnel, an air supply pipe 1 extending from the wellhead to the face is installed along the upper side, and a rail 2 is laid. A dust collector 4 is mounted on the general carriage 3 that moves on the rail 2, and an intake pipe 5 is connected to the dust collector 4.
The intake pipe 5 is disposed along the upper part of the tunnel and has an open end that extends near the face. By operation of the dust collector 4, air containing dust near the face is sucked from the intake pipe 5, and the dust collector 4 separates and removes dust from the air.
[0015]
The air curtain device includes a gate-shaped air duct 6 connected to the intake pipe 5, and is configured by fixing the gate-shaped air duct 6 to the wife side of the general carriage 3.
The portal-shaped air pipe 6 is a PVC pipe, and is located on the left side in the figure and extends in the vertical direction, and on the upper side, the horizontal pipe part 62 that extends in the horizontal direction and located on the right side in the figure. It consists of a vertical pipe portion 63 extending in the vertical direction. The vertical pipe 61 on the left side of the figure has a large number of air holes 61a that open to the left and right, is connected to the intake pipe 5 at the upper end, and is closed at the lower end. The horizontal pipe part 62 has a large number of ventilation holes 62a that open vertically, and is connected to the intake pipe 5 at the left end in the figure. A vertical pipe portion 63 is integrally connected to the right side of the horizontal pipe portion 62 via a curved corner portion. The vertical pipe portion 63 has a large number of air holes 63a that open to the left and right. It is blocked.
[0016]
In addition, the intake pipe 5 is almost entirely a vinyl pipe, but the connection portion with the portal-shaped blower pipe 6 is formed by a steel pipe portion 50. As shown in FIG. 2, the steel pipe portion 50 is integrally provided with a branch pipe 51 projecting obliquely downward and a branch pipe 52 projecting horizontally in the lateral direction. A partition wall 53 having a size slightly less than the right half of the figure is provided in the steel pipe portion 50 on the dust collector 4 side from the two branch pipes 51 and 52.
In the steel pipe portion 50 of the intake pipe 5 described above, the portal-shaped blower pipe 6 has a vertical pipe portion 61 connected to the branch pipe 51 and a horizontal pipe portion 62 connected to the branch pipe 52. The steel pipe part 50 is fixed to the general carriage 3.
[0017]
Next, the operation of the air curtain device for tunnel construction having the above configuration will be described.
During tunnel excavation, fresh air is constantly supplied to the face through the air supply pipe 1 by operation of a blower (not shown) installed on the wellhead side, and dust near the face is removed by operation of the dust collector 4 as described above. The contained air is sucked from the intake pipe 5 and the dust is separated and removed.
A part of the suction air flowing in the intake pipe 5 flows into the gate-shaped blower pipe 6.
[0018]
That is, the air flowing in the intake pipe 5 is partially blocked by the partition wall 53 having a size slightly less than the right half in the steel pipe 50 as shown in FIG. It actively flows into the vertical pipe portion 61 and the horizontal pipe portion 62 through the two branch pipes 51 and 52, respectively.
Since the lower end portion of the air that has flowed into the vertical pipe portion 61 is closed, the air is blown out to the left and right sides from a large number of air holes 61a that are open to the left and right as indicated by arrows in FIG.
At the same time, the air flowing into the horizontal pipe portion 62 is also opened up and down the horizontal pipe portion 62 as indicated by arrows in FIG. 1 because the lower end portion of the continuous vertical pipe portion 63 is closed. The air is blown out in both the upper and lower directions from the large number of air blowing holes 62a, and the air is blown out from the large number of air blowing holes 63a opened to the left and right of the vertical pipe portion 63 to the left and right sides.
[0019]
As described above, an air curtain is formed by the air blown out from the large number of air holes 61 a, 62 a, 63 a opened in the vertical tube portions 61, 63 and the horizontal tube portion 62 in the portal-shaped blast tube 6. Therefore, dust in the section near the tunnel face can be blocked.
In addition, since air is only blown out from the large number of blow holes 61a, 62a, 63a of the vertical pipe portions 61, 63 and the horizontal pipe portion 62 that form a portal shape, there is no air dust and no blind air leakage as in the prior art.
[0020]
As the tunnel excavation progresses, the air curtain device (the gate-shaped blower pipe 5) can be moved together with the general carriage 3 on which the dust collector 4 is mounted.
Further, in the embodiment, in the intake pipe 5 that is formed almost entirely of a vinyl pipe, the connection portion with the portal-shaped blower pipe 6 is a steel pipe portion 50, and two branch pipes 51 and 52 and a partition wall 53 are provided. Therefore, it has sufficient strength, and the intake air can be branched and taken out and the vertical tube portion 61 and the horizontal tube portion 62 can be reliably connected.
[0021]
In addition, in the above embodiment, although the portal-shaped air blow pipe by the PVC pipe was used, this invention is not limited to this, The air blow pipe may be another resin pipe or a metal pipe. .
In addition, it is needless to say that other specific detailed structures can be appropriately changed.
[0022]
【The invention's effect】
According to the first aspect of the present invention, in the vicinity of the tunnel face, while using the air flow sucked into the intake pipe by the dust collector, the gate-shaped blow pipe having a large number of blow holes makes it possible to wind up dust and blind spots. There is no air leakage and there is little air leakage, and it is possible to form an air curtain necessary and sufficient to block dust.
[0023]
According to the second aspect of the invention, in addition to the effect obtained by the first aspect of the invention, part of the air flow sucked into the intake pipe is positively introduced into the gate-shaped air duct by the partition wall. The advantage of being able to guide is obtained.
[0024]
According to the invention described in claim 3, in addition to the effect obtained by the invention described in claim 1 or 2, an advantage that the air curtain device can be moved together with the dust collector mounted carriage can be obtained.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view showing an air curtain device in a tunnel, showing a configuration of an embodiment to which the present invention is applied.
FIGS. 2A and 2B show a connection portion of an intake pipe and a blower pipe, in which FIG. 2A is a schematic side view, and FIG. 2B is a view seen from the left side of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Air supply pipe 2 Rail 3 General trolley 4 Dust collector 5 Intake pipe 50 Steel pipe part 51 * 52 Branch pipe 53 Partition wall 6 Portal-shaped ventilation pipe 61 * 63 Vertical pipe part 62 Horizontal pipe part 61a * 62a * 63a

Claims (3)

To the intake pipe that sucks the air near the face of the tunnel to the dust collector,
A horizontal pipe portion having a large number of blower holes that are located on the upper side in the tunnel and extend in the horizontal direction and open in the vertical direction; A vertical pipe portion having a ventilation hole,
An air curtain device for tunnel construction, wherein a portal-shaped air duct through which a part of the suction air in the intake pipe flows is connected. 2. The air curtain device for tunnel construction according to claim 1, wherein a partition wall is provided in the intake pipe for guiding a part of the suction air into the gate-shaped blower pipe. The air curtain device for tunnel construction according to claim 1 or 2, wherein the portal-shaped air duct is fixed to a carriage on which the dust collector is mounted.

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