JP2008101329A - Ventilation system in tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation system in a tunnel preventing spreading of contaminated air in the tunnel even when output of an exhaust fan device or a blow fan device is temporarily reduced or stopped by continuing to form an independent air curtain cutting off a working face side working space from an entrance side in a tunnel cross sectional direction. <P>SOLUTION: The blow fan device 15, the exhaust fan device 16, and an air supply fan device 18 are installed on an installation shelf 14 in a movable facility rack 11 in the tunnel 50. The air supply fan device 18 sends air into an air supply pipe 20 installed along a wall surface 50a of the tunnel 50, air is blown out of a multiplicity of air nozzles 20a formed in the air supply pipe 20 to form the air curtain, and the working face side working space 55 is formed, cut off from the entrance side. The blow fan device 15 sends fresh air from a blowout opening 15a into the working face side working space 55, and the exhaust fan device 16 sucks in contaminated air in the working face side working space and sends it to an exhaust duct 54. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a tunnel ventilation device, and more particularly, a partial space (face working space) in a tunnel where a face is located is cut off from the tunnel head side by an air curtain, and dust generated in the face is removed in the tunnel. TECHNICAL FIELD The present invention relates to a tunnel ventilation device that exhausts air to the outside of a mine without being diffused and supplies fresh air to a working space on the face.

  In the tunnel, a lot of dust is generated by face excavation and projecting work. In recent years, environmental problems have become a major problem, and various systems have been developed for ventilation of the working space on the working face side in tunnel construction. As typical examples of such a ventilation system, a ventilation device in a tunnel under construction disclosed in Patent Document 1 and a ventilation device in a tunnel disclosed in Patent Document 2 are known.

  In the ventilation device in the tunnel under construction disclosed in Patent Document 1, a transport vehicle loaded with a dust collector is arranged near the face in the tunnel under construction, and a suction duct for sucking contaminated air from the dust collector toward the face is provided. In this way, contaminated air near the face is sucked into the dust collector through this suction duct, and at the same time, fresh air is sent from another wind pipe toward the face. In this ventilator, the amount of air that the dust collector sucks through the suction duct is larger than the amount of fresh air that is sent from the wind tube to the face, so that the air between the dust collector's exhaust port and the suction port's tip suction port A curtain zone is formed.

Moreover, in the ventilation apparatus in the tunnel disclosed by patent document 2, the exhaust wind pipe provided with the inlet port opened toward the face working area | region which is the range of 30-50 m from a face face is installed in a tunnel, The main body of the air supply pipe is installed so that the main outlet is located closer to the wellhead side than the inlet of the exhaust air pipe, and it is formed around the circumference of the branch air pipe connected to the vicinity of the main outlet of the main body The air curtain is formed by blowing clean air from the branched outlet in the direction of the cross section of the tunnel. Thus, according to the ventilation device in the tunnel disclosed in Patent Document 2, coupled with the intake air amount sucked from the intake port of the exhaust wind pipe being larger than the air supply amount blown from the main air outlet of the air supply wind pipe. An air curtain that cuts off the face working area and the well head side in the longitudinal direction of the tunnel is formed on the tunnel side from the face working area, so that the exhaust air pipe is not diffused in the face working area without being diffused into the tunnel. Is sucked into the dust collector.
JP 2003-262100 A JP 2006-183403 A

  However, in the ventilation device in the tunnel under construction disclosed in Patent Document 1, an air curtain band is formed by making the face side negative pressure due to the difference between the suction amount to the dust collector and the air supply amount from the wind pipe. Therefore, it is necessary to maintain the air supply amount through the wind pipe and the suction amount through the suction duct with high accuracy, and it is very difficult to control and balance between the air supply output or the suction output. If the air is broken or lowered temporarily, the air curtain will not be formed, and there is a risk that contaminated air will diffuse into the tunnel at once. In other words, in order to prevent the dust generated at the face from diffusing into the tunnel, there is a problem that it is necessary to always continue accurate air blowing and suction during the face work.

  Moreover, in the ventilation apparatus in a tunnel disclosed by patent document 2, the clean air sent from a blower to a face work area | region through a blower pipe main body is blown out from the branch blower outlet in the vicinity of the main blower outlet in the cross-sectional direction of a tunnel. In the same way as in Patent Document 1, negative pressure is applied to the face work area due to the difference between the amount sucked into the dust collector via the exhaust wind pipe and the amount of clean air blown out from the main air outlet of the air supply wind pipe body. Therefore, it is absolutely necessary to maintain the operation of the blower and dust collector during work such as face excavation and projecting. The output of these blowers and dust collectors is temporarily required. When the air flow drops or stops, there is a problem that the air curtain disappears and the dust generated at the face diffuses into the tunnel.

  An object of the present invention is to solve such a conventional problem, and during work such as excavation with a face, between the suction port of the exhaust fan device and the air suction port of the air supply fan device. Even if the output of the exhaust fan device or the air supply fan device is temporarily reduced or stopped, it continues to form an independent air curtain that cuts off the working space on the face side and the pit side in the direction of the tunnel cross section An object of the present invention is to provide a tunnel ventilation device that prevents diffusion into the tunnel.

  The present invention is a ventilator that exhausts the contaminated air containing dust generated at the face of the mine shaft to the outside of the mine shaft and ventilates the work space on the face side by sending fresh air toward the face. The feature is that it is mounted on an installation shelf of a mobile equipment stand that is movably installed in the tunnel, the air outlet on one end faces the working space on the face side, and the air inlet on the other end An air supply fan device that is located on the mine shaft side of the mine shaft, sucks fresh air from the air suction port, and feeds air from the air outlet toward the work space on the face side, and a suction port on one end is the work space on the face side And an exhaust port at the other end is connected to an exhaust duct extending in the tunnel direction of the tunnel, and the suction port is spaced in the longitudinal direction of the tunnel with respect to the air suction port of the air supply fan device Together with the working face side working sky An exhaust fan device installed on the installation shelf so as to be located between the suction port of the exhaust fan device and the air suction port of the air supply fan device. An air curtain is formed in a cross-sectional direction of the tunnel perpendicular to the longitudinal direction of the tunnel, and the air curtain is formed, and the air curtain forming means forms the face side working space blocked by the air and the pit side. Means is installed along the wall surface of the tunnel between the air supply fan device, the air suction port of the air supply fan device and the suction port of the exhaust fan device, and air is supplied from the air supply fan device. Are formed in a portion facing the wall surface of the mine shaft and a portion facing the central portion in the cross-sectional direction of the mine on the opposite side. In that it is composed of an air ejection hole.

  In one example of an embodiment of the tunnel ventilation device of the present invention, the air supply pipe extends from the ceiling of the wall surface of the tunnel along both side walls, passes through the side of the installation shelf, and extends downward therefrom. ing.

  In another example of the embodiment of the tunnel ventilation device of the present invention, the air curtain forming means has one end connected to the air supply port of the air supply fan device and the other end connected to the air supply pipe. The other end of the connection pipe is connected in the vicinity of the ceiling portion of the tunnel, which is approximately the middle portion in the length direction of the air supply pipe disposed along the wall surface of the tunnel. Yes.

    In another example of the embodiment of the tunnel ventilation device of the present invention, the air supply pipe is formed of a tube material that can be expanded and contracted by a bellows, and is installed at a predetermined interval from the wall surface of the tunnel.

  According to the mine ventilation apparatus of the present invention, the air supply fan apparatus, the exhaust fan apparatus, and the air supply fan apparatus are installed on the installation rack of the equipment stand that can move in the mine tunnel, and the air intake of the air supply fan apparatus is provided. An air supply pipe is disposed along the wall surface of the tunnel between the suction port of the exhaust fan device located at a distance in the longitudinal direction of the tunnel with respect to the opening, and clean air is supplied from the supply fan device to the supply pipe. The air curtain is formed by blowing clean air from the air outlet hole of the air supply pipe to form the air curtain, so that the air curtain can be formed without being affected by the operation of the air supply fan device and the exhaust fan device. In the unlikely event that the operation output of the air supply fan device or the exhaust fan device is temporarily reduced, or even if it stops, the air curtain will diffuse the contaminated air including dust generated at the face into the tunnel. By It is possible to stop.

  In addition, according to the tunnel ventilation device of the present invention, the air supply fan device and the exhaust fan device are usually installed in the upper part of the tunnel using a moving equipment stand or the like. Since the wall passes through the side of the installation shelf along the side walls and extends downward from the ceiling of the wall surface of the tunnel, the air blown out from the air outlet hole of the air supply pipe is directed toward the center of the tunnel under the installation shelf. The air curtain can be formed almost across the entire cross section of the tunnel, and the dust generated at the face can be reliably prevented from spreading in the direction of the wellhead from the moving equipment stand.

  Furthermore, according to the tunnel ventilation device of the present invention, since the air supply pipe is formed of a tube material that can be expanded and contracted by a bellows, it can be bent freely, and as a result, the wall surface of the tunnel with a substantially semicircular cross section can be easily formed. It can be installed at a predetermined interval. Along with the ease of installation, the air supply pipe is installed at a predetermined interval with respect to the wall surface of the tunnel, so that the balance of the air jet output for the air curtain blown out from each air jet hole can be averaged. Thus, a stable air curtain can be formed. Furthermore, the formation of such a stable air curtain is achieved by connecting the other end of the connecting pipe connected to the air supply port of the air fan device installed on the installation shelf of the mobile equipment stand to the pipe portion of the air supply pipe located at the ceiling of the tunnel. By connecting, it is ensured by balancing the pressure balance in the both side pipe portions of the air supply pipe extending from the ceiling portion of the tunnel along both sides.

  BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a preferred embodiment shown in the drawings will be described in further detail for a tunnel ventilation device of the present invention. 1 to 3 show a tunnel ventilation device 10 according to an embodiment of the present invention. FIG. 1 is a front view of a mine ventilator 10 installed in a mine tunnel cut from a plane perpendicular to the longitudinal direction and viewed from the face 53 side, and FIG. 2 is a mine ventilator 10 shown in FIG. FIG. 4 is a plan view (top view) of the mine ventilation apparatus 10 shown in FIG. The tunnel ventilation device 10 shown in FIGS. 1 to 3 is installed on an installation shelf 14 of a mobile equipment gantry 11 movably installed in the tunnel 50. The moving equipment stand 11 has a gate shape when viewed from the end face side in the moving direction, and a plurality of carriages 13 each having wheels 12 are attached to the lower end portion. The installation shelf 14 in which the tunnel ventilation device 10 is installed is the uppermost shelf of the gate-shaped mobile equipment mount 11 and is located near the ceiling of the tunnel 50. The wheel 12 of the carriage 13 is placed on a rail 52 laid on the invert 51 of the mine shaft 50, so that the moving equipment base 11 can move on the rail 52.

  The tunnel ventilation device 10 includes one air supply fan device 15 and one exhaust fan device 16 installed on an installation shelf 14 formed on the uppermost portion of the moving equipment stand 11. The air supply fan device 15 includes an air outlet 15a at one end and an air suction port 15b at the other end, and a fan body (not shown) is provided between the both ends 15a and 15b. It is rotated by a driving device. As is clear from FIGS. 2 and 3, the air supply fan device 15 is disposed with the air outlet 15a facing the face 53 and the air air outlet 15b facing the well mouth side, and fresh air is supplied from the air inlet 15b. The air is sucked and supplied from the outlet 15a toward the face 53.

  The exhaust fan device 16 includes a suction port 16a at one end and an exhaust port 16b at the other end, and a fan body (not shown) is provided between the both ends 16a and 16b. It is rotated by a driving device. As is clear from FIGS. 2 and 3, the exhaust fan device 16 has the suction port 16 a directed toward the face 53 and the exhaust port 16 b directed toward the pit side so that the exhaust fan device 15 is substantially aligned with the air supply fan device 15. It is mounted on the installation shelf 14. The air supply fan device 15 and the exhaust fan device 16 move in such a positional relationship that the air suction port 15b of the air supply fan device 15 is spaced from the suction port 16a of the exhaust fan device 16 in the longitudinal direction of the tunnel 50. It is installed on the installation shelf 14 of the equipment stand 11. An exhaust duct 54 extending toward a wellhead (not shown) is connected to the exhaust port 16 b in the air supply fan device 16. The exhaust duct 54 exiting from the tunnel 50 from the wellhead is connected to a contaminated air purification facility (not shown) equipped with a dust collector. Note that a relay fan device (not shown) is installed in the exhaust duct 54 between the exhaust fan device 16 and the contaminated air purification facility as necessary. Thus, the exhaust fan device 16 exhausts the contaminated air on the face side sucked from the suction port 16 a from the exhaust port 16 b to the exhaust duct 54, and the contaminated air exhausted to the exhaust duct 54 passes through the exhaust duct 54. After being sent to the contaminated air purification facility and purified, it is released to the atmosphere.

  The tunnel ventilation device 10 further includes an air curtain forming means 17. The air curtain forming means 17 includes an air supply fan device 18, a connection pipe 19 connected to the air supply port 18 a of the air supply fan device 18, and an air supply pipe 20 connected to the connection pipe 19. Yes. The air supply fan device 18 is attached to the installation shelf 14 of the moving equipment mount 11 in the space between the air supply fan device 15 and the exhaust fan device 16 as shown in FIGS. The air supply pipe 20 is a tunnel between the air suction port 15b of the air supply fan device 15 and the suction port 16a of the exhaust fan device 16 positioned at a distance in the longitudinal direction of the tunnel 50 with respect to the air suction port 15b. It is installed along 50 wall surfaces 50a. More specifically, the air supply pipe 20 constituting the air curtain forming means 17 extends along the both side walls from the ceiling of the mine shaft 50 with a predetermined distance from the wall surface 50a of the mine shaft 50. Each side of the installation shelf 14 passes through and extends downward, and its lower end is closed. When the air supply pipe 20 is installed along the wall surface 50a of the mine shaft 50 with a predetermined interval, a support member such as a support rod attached to the installation shelf 14 of the mobile equipment mount 11 or other fixed portion (see FIG. Not shown) is used. The connection pipe 19 and the air supply pipe 20 are formed of a tube material that can be expanded and contracted by a bellows, and can be freely bent.

  In the air supply pipe 20, a number of air ejection holes 20 a are provided in the length of the air supply pipe 20 in the portion facing the wall surface 50 a of the mine shaft 50 and the portion facing the center in the cross-sectional direction of the mine shaft 50 on the opposite side. It is formed at a predetermined interval in a row in the direction. Further, the other end of the connection pipe 19 whose one end is connected to the air supply port 18 a of the air supply fan device 18 is connected to a pipe portion of the air supply pipe 20 located in the vicinity of the ceiling portion of the tunnel 50. That is, the air supply pipe 20 has an intermediate portion that is substantially half of the entire length thereof positioned at the ceiling of the tunnel 50, and the other end of the connection pipe 19 is therefore connected to an approximately intermediate portion of the air supply pipe 20. Will be. As a result, the air supplied from the air supply fan device 18 is sent to the pipe portions on both sides from the intermediate part of the air supply pipe 20 via the connection pipe 19, so that both sides of the ceiling of the tunnel wall 50 are used as boundaries. The air pressure in the pipe portions on both sides of the air supply pipe 20 extending along the wall is almost equal to the air pressure, and the air pressure blown out from the air jet holes 20a in the pipe portions on both sides can be balanced. In this way, air is ejected from the air ejection holes 20a of the air supply pipe 20, so that the longitudinal direction of the mine shaft 50 is between the suction port 16a of the exhaust fan device 16 and the air suction port 15b of the air supply fan device 15. An air curtain is formed in a cross-sectional direction of the mine shaft that is perpendicular to the mine shaft, and a face side working space 55 that is blocked by air from the mine shaft side of the mine shaft 50 is formed. Since the air sent from the air supply fan device 18 to the air supply pipe 20 is fresh air, the air supply fan device 18 is installed on the installation shelf 14 closer to the wellhead than the installation position of the air supply pipe 20 forming the air curtain. It is installed above.

  Next, operation | movement of this tunnel internal ventilation apparatus 10 is demonstrated. The moving equipment base 11 is fixed on a rail 52 laid on the invert 51 of the mine shaft 50 in a stationary state, approximately 30 m to 80 m before the face 53, and an exhaust duct 54 is connected to the exhaust port 16 b of the exhaust fan device 16. The When the moving equipment base 11 is stopped at a predetermined position before the face 53, the face side working space 55 is the inside of the tunnel 50 on the face side from the air supply pipe 20. That is, since an air curtain is formed in the cross-sectional direction of the mine shaft 50 at the position of the air supply pipe 20, the face side and the wellhead side are blocked by the air flow with this air curtain as a boundary. The cut face side space is a face side work space 55.

  Thereafter, the air supply fan device 18 is operated, and fresh air is pumped to the air supply pipe 20 via the connection pipe 19. As a result, fresh air is ejected from the numerous air ejection holes 20a of the air supply pipe 20 in the cross-sectional direction of the mine shaft 50 as indicated by the arrow 21 in FIG. Specifically, the air ejected from a large number of air ejection holes 20a formed in the portion of the air supply pipe 20 facing the mine wall surface 50a flows toward the wall surface 50a, and between the air supply pipe 20 and the wall surface. Form an air curtain. Further, the air jetted from a large number of air jet holes 20a formed in the portion opposite to the portion facing the mine wall surface 50a of the air supply pipe 20 is a cross section of the mine shaft 50 as shown by an arrow 22 in FIG. An air curtain is formed in the whole area inside the mine shaft 50 that flows inward and is surrounded by the air supply pipe 20. At that time, the lower end portions 20b and 20c of the air supply pipe 20 extending downward from the ceiling portion of the mine shaft 50 of the air supply pipe 20 along the both side walls of the wall surface 50a install the air supply fan device 15 and the exhaust fan device 16. Since it passes through the side of the installed shelf 14 and extends downward, air passes between the support pillars of the mobile equipment base 11 and an air curtain is also provided inside the gate-type mobile equipment base 11. It can be reliably formed.

  In this way, the air curtain is formed to secure the face working space 55, and then the air supply fan device 15 and the exhaust fan device 16 are operated. The air supply fan device 15 sucks in fresh air in the opposite pit side tunnel through the face side work space 55 and the air curtain from the air suction port 15b and blows it out from the blowout port 15a located in the face side work space 55. On the other hand, in the exhaust fan device 16, the air in the face side work space 55 is sucked from the suction port 16 a located in the face side work space 55 and is exhausted from the exhaust port 16 b to the exhaust duct 54. At this time, the amount of air that the air supply fan device 15 supplies to the face side work space 55 and the amount of exhaust air that is sucked from the face side work space 55 by the exhaust fan device 16 are controlled to be substantially the same amount.

  Work such as excavation and projection of the face 53 is performed in a state in which such a tunnel ventilation device 10 is operated, and air in the face-side work space 55 is excavated and extended along with this work. Contaminated by dust generated in Such contaminated air is sucked from the suction port 16a of the exhaust fan device 16 as indicated by the black arrow 23 in FIG. 3, and continues to be sent to the exhaust duct 54 via the exhaust port 16b. On the other hand, as described above, the air supply fan device 15 sucks in fresh air in the opposite mine shaft side through the face side working space 55 and the air curtain from the air suction port 15b, and the white arrow in FIG. As shown by 24, fresh air is blown out from the blowout port 15a toward the face side working space 55.

  The contaminated air drifting in the face working space 55 cannot flow out from the face working space 55 to the wellhead side due to the air curtain formed by the air ejected from the numerous air ejection holes 20a in the air supply pipe 20, Workers working on the side can be protected from dust contamination. In particular, in this tunnel ventilation device 10, even if the operation output of the air supply fan device 15 or the exhaust fan device 16 temporarily decreases or stops for some reason, the air supply fan device 18 is operated. As long as the air curtain continues to be formed, there is no possibility that the contaminated air drifting in the working space 55 on the face side will immediately diffuse into the tunnel. However, for that purpose, it is necessary to separate the operation control device and power supply system of the air supply fan device 18 from the air supply fan device 15 and the exhaust fan device 16 as separate systems or to secure a backup system. Needless to say.

  In this way, ventilation of the working face side working space 55 is performed while preventing diffusion of contaminated air including dust generated during excavation and projecting work at the working face 53 into the tunnel, and progress of excavation of the working face 53. Along with this, the moving equipment base 11 is moved to advance the air curtain forming position. The advancement of the mobile equipment stand 11 may be continuous or intermittent. In this tunnel ventilation device 10, as described above, all of the air supply fan device 15, the exhaust fan device 16, and the air curtain forming means 17 are installed on the moving equipment base 11. Accordingly, the advancement of the air curtain formation position merely advances the moving equipment base 11. In that case, it is very easy to move the moving equipment base 11 forward. That is, advancement of the mobile equipment base 11 only needs to extend the exhaust duct 54, and the extension of the exhaust duct 54 can be easily performed by partially connecting a telescopic tube with bellows. . Such easy advancement of the mobile equipment stand 11 is due to the fresh air in the tunnel on the wellhead side from the face working space 55 due to the reliable formation of the air curtain with the above-described structure. That is, the air supply fan device 15 can take in fresh air from the face side working space 55 as it is from the air suction port 15b as it is.

As described above, in the tunnel ventilation device 10, the air supply fan device 15, the exhaust fan device 16, and the air supply fan device 18 are installed on the installation shelf 14 of the mobile equipment stand 11 that can move in the tunnel 50. The air supply pipe 20 is connected along the wall surface 50a of the mine shaft 50 between the suction port 16a of the exhaust fan device 16 and spaced from the air suction port 15b of the air supply fan device 15 in the mine shaft longitudinal direction. Since the clean air is supplied from the air supply fan device 18 to the air supply pipe 20 and the clean air is ejected from the air ejection holes 20a of the air supply pipe 20, the air curtain is formed. The air curtain can be formed and maintained without being affected by the operation of the fan device 15 and the exhaust fan device 16, and the operation output of the air supply fan device 15 and the exhaust fan device 16 is temporarily reduced. It can prevent the contaminated air, including dust generated in the cutting face 53 be stopped from diffusing into 50 galleries.

  Moreover, in the tunnel ventilation device 10, the air supply fan device 15 and the exhaust fan device 16 are usually installed in the upper part of the tunnel 50 by using the moving equipment stand 11 or the like. 20 extends from the ceiling portion of the wall surface 50a of the mine shaft 50 along both side walls through both sides of the installation shelf 14 of the moving equipment mount 11 and extends downward from the ceiling. The air blown out from the heading toward the center of the tunnel 50 under the installation shelf 14 can form an air curtain in almost the entire cross section of the tunnel 50, and the dust generated at the face 53 is disturbed by the mobile equipment frame 11 It can be surely prevented from spreading in the direction of the wellhead.

  Furthermore, according to the mine ventilator 10, since the air supply pipe 10 is formed of a tube material that can be expanded and contracted by a bellows, it can be bent freely. As a result, the wall surface of the gallery 50 having a substantially semicircular cross section can be easily formed. Can be installed at predetermined intervals. Along with the ease of installation, the air supply pipe 50 is installed at a predetermined interval with respect to the wall surface 50a of the tunnel 50, so that the balance of the air jet output for the air curtain blown out from each air jet hole 20a is averaged. This makes it possible to form a stable air curtain. In addition, such a stable air curtain is formed by supplying air in which the other end of the connection pipe 19 whose one end is connected to the air supply port 18a of the air supply fan device 18 installed on the moving equipment base 11 is located on the ceiling portion of the mine shaft 50. Since it is connected to the site of the pipe 20, it is further ensured by balancing the pressure balance in both sides of the air supply pipe 20 extending along the both sides from the ceiling portion of the tunnel 50.

1 is a front view showing a tunnel ventilation device according to an embodiment of the present invention in a cross-section in a direction perpendicular to the longitudinal direction of the tunnel. It is a side view of the mine ventilation apparatus shown by FIG. It is a top view of the mine ventilation apparatus shown by FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Mine ventilator 11 Mobile equipment stand 12 Wheel 13 Car 14 Installation shelf 15 Air supply fan device 15a Air outlet 15b Air inlet 16 Exhaust fan device 16a Suction port 16b Exhaust port 17 Air curtain formation means 18 Air supply fan device 18a Supply Vent 19 Connection pipe 20 Supply pipe 50 Tunnel 50a Wall surface 51 Invert 52 Rail 53 Face 54 Exhaust duct 55 Face side work space

Claims (4)

In a ventilator that exhausts contaminated air containing dust generated at the face of the mineway to the outside of the mineway and ventilates the work space on the face side by sending fresh air toward the face,
It is mounted on an installation shelf of a mobile equipment stand that is movably installed in the mine shaft, one end of the air outlet faces the working space on the face side, and the other air inlet is located on the mine port side of the mine shaft. An air supply fan device that draws in fresh air from the air intake port and supplies air from the air outlet toward the face working space;
A suction port at one end faces the working space on the face side, and an exhaust port at the other end is connected to an exhaust duct extending in the direction of the tunnel in the tunnel, and the suction port is connected to the air suction port of the air supply fan device. On the other hand, an exhaust fan device installed on the installation shelf so as to be spaced in the longitudinal direction of the mine shaft and located in the face side working space,
The air curtain is installed on the installation shelf, and forms an air curtain in a cross-sectional direction perpendicular to the longitudinal direction of the mineway between the suction port of the exhaust fan device and the air suction port of the air supply fan device, An air curtain forming means that forms the working space on the face side blocked by air and the pit side of the tunnel,
The air curtain forming means is installed along the wall surface of the tunnel between the position of the air supply fan device, the air suction port of the air supply fan device and the suction port of the exhaust fan device, and the air supply An air supply pipe through which air is supplied from a fan device, and a plurality of portions formed on a portion facing the wall surface of the mine shaft of the air supply pipe and a portion facing the center in the cross-sectional direction of the mine shaft on the opposite side A tunnel ventilation device characterized by comprising an air ejection hole.   2. The mine ventilation apparatus according to claim 1, wherein the air supply pipe extends from a ceiling portion of the wall surface of the mine shaft along both side walls, passes through a side portion of the installation shelf, and extends downward therefrom.   The air curtain forming means includes a connection pipe having one end connected to the air supply port of the air supply fan device and the other end connected to the air supply pipe, and the other end of the connection pipe is connected to the air supply pipe. The in-tunnel ventilation device according to claim 1 or 2, which is connected in the vicinity of a ceiling portion of the tunnel, which is an approximately middle portion in the length direction of the air supply pipe disposed along the wall surface of the tunnel. The in-tunnel ventilation device according to any one of claims 1 to 3, wherein the air supply pipe is formed of a tube material that can expand and contract by a bellows, and is installed at a predetermined interval from the wall surface of the tunnel.

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