JP2005030129A - Ventilation equipment in tunnel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide ventilation equipment in a tunnel, which brings about an excellent dust collecting effect by forming an air curtain near an inlet port of a dust collector in a gallery of the tunnel without using a very large-size dust collector. <P>SOLUTION: This ventilation equipment 1 in the tunnel 2 comprises an air-supply airpipe 10 and the dust collector 20 which is equipped with an exhaust airpipe 22. The airpipe 10 has a main blow-out opening 13 for blasting out air to the side of a cutting face 3, and branch blow-out openings 14-17 for blasting out the air in the radial direction of the tunnel 2. The air curtain AC is formed near the inlet port 24 of the exhaust airpipe 22 of the tunnel 2 by using clean air CA blasted out from the air outlets 14-17. The circulation of polluted air FA to the side of a pit mouth 4 is inhibited by the air curtain AC, so that the dust collecting effect brought about by the dust collector 20 can be enhanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention discharges, for example, dust generated in the tunnel, toxic substances (gas) such as hydrogen sulfide and sulfur dioxide (hereinafter, these may be collectively referred to as “dust”), and in particular, the dust concentration in the tunnel is reduced. The present invention relates to a ventilation device in a tunnel for reduction.

When constructing large underground structures or excavating mountain tunnels, a large amount of dust is generated along with the excavation work. If such dust remains in the tunnel, it may harm the health of workers such as pneumoconiosis. In particular, the dust in the work area near the face (hereinafter referred to as the “face work area”) is transferred to the outside of the tunnel. Ventilation devices are known for exhausting. An example of such a ventilation method is disclosed in Japanese Patent Laid-Open No. 10-252400. In this ventilation method, external air is forcibly introduced in the vicinity of the face via a wind tube, and dust or the like in the vicinity of the face is collected by a dust collector. At this time, the amount of exhaust by the dust collector is made larger than the amount of external air introduced, and a wind tube is connected to the exhaust side of the dust collector to send dust on the face side. The dust collector captures dust and the like to purify the air, and the purified air flows to the face side to form an air curtain region in the vicinity of the dust collector inlet in the tunnel. By the action of the air curtain, dust and the like are prevented from flowing toward the tunnel entrance, and are surely collected by the dust collector.
JP-A-10-252400

  In the ventilator disclosed in Patent Document 1, the air curtain is formed in the vicinity of the intake port of the dust collector when the air discharged from the dust collector flows toward the face. However, in order for the air discharged from the dust collector to flow toward the face and form such an air curtain, a very large dust collector is required.

  If the amount of exhaust by the dust collector is slightly larger than the amount of external air introduced, the air curtain is formed, but the air curtain is formed near the exhaust port of the dust collector. Dust etc. will move to the position near a wellhead, and the dust collection effect | action by a dust collector will be reduced. Therefore, in order to form an air curtain near the intake port of the dust collector, there is a problem that a very large dust collector must be used.

  Therefore, an object of the present invention is to provide a ventilation device in a tunnel having an excellent dust collection effect by forming an air curtain near the intake port of the dust collector in a tunnel tunnel without using a very large dust collector. It is in.

  A ventilating apparatus for a tunnel according to the present invention that has solved the above problems is a ventilation apparatus for ventilating the inside of a tunnel, in which an air supply pipe having an air outlet for blowing air toward the face of the tunnel is formed. , And a dust collector equipped with an exhaust wind pipe that sucks air in a working area in the tunnel and removes and discharges dust contained in the air. A branch passage that divides the air passing through is formed, and is divided into a main air outlet that blows air toward the face and a position that avoids the face in the face working area in the tunnel. A branch outlet that blows out the air is formed, and an intake port in the exhaust wind pipe is disposed closer to the face side of the tunnel than a branch outlet in the air supply pipe.

  In the ventilation device in the tunnel according to the present invention, a branch passage is formed in the air supply pipe, and the main outlet and the branch outlet are connected to each other. Air is blown out from the main air outlet toward the face, and air is blown out from the branch air outlet toward a position avoiding the face in the face working area, for example, in the radial direction of the tunnel. Here, since the intake port of the exhaust wind pipe in the dust collector is disposed on the face side with respect to the branch outlet of the air supply duct, an air curtain is formed by the air blown from the branch outlet. Due to the action of this air curtain, there is no need for special equipment only with the air exhausted from the dust collector, and even if a dust collector smaller than the normal method is used, the air curtain can be It can be formed in the vicinity of the intake port. Therefore, an air curtain can be formed in the vicinity of the air inlet of the dust collector in the tunnel tunnel without using a very large dust collector, thereby enhancing the dust collection effect.

  Here, it is preferable that the exhaust wind pipe is a telescopic wind pipe that is extendable along the tunnel direction of the tunnel.

  As described above, since the exhaust wind pipe is a telescopic wind pipe, the exhaust wind pipe can be easily retreated to the wellhead side during the blasting work performed as the tunnel excavation work. Therefore, it is possible to provide a ventilation device in the tunnel that does not hinder the tunnel excavation work.

  In addition, it is preferable that an opening area adjusting means for adjusting the opening areas of the main air outlet and the branch air outlet in the air supply pipe is provided.

  When ventilating the tunnel, it is desirable to adjust the amount of air supplied based on the amount of dust, the cross-sectional area of the tunnel, and the like. In this respect, in the ventilation device in the tunnel according to the present invention, the opening area of the outlet can be adjusted, so that the amount of air blown out can be easily adjusted.

Further, it is preferable that the branch wind pipe has a plurality of branch outlets.
Since the branch wind pipe has a plurality of branch outlets, it is possible to blow out a branch flow over a wide range, and as a result, an air curtain can be reliably formed.

  Further, it is more preferable that air direction adjusting means for adjusting the air direction of the air blown out from the branch outlet is provided. By providing such wind direction adjusting means, it is possible to easily adjust the place where the air curtain is formed, for example, when the amount of dust generated varies depending on the work.

  Furthermore, it is preferable that the branch outlet in the branch wind pipe is an aspect including an opening formed by cutting out a side surface of the branch wind pipe. As described above, the branch air outlet is formed by notching the opening, so that the branch air outlet does not protrude to the side of the branch wind pipe, and does not interfere with work by a work machine or the like. can do.

  At this time, the opening area adjusting means may be configured by a shutter that covers the opening.

  With such a shutter, the opening area adjusting means can be easily formed.

  As described above, according to the present invention, an air curtain is formed in the vicinity of the intake port of the dust collector in the tunnel tunnel without using a very large dust collector, thereby providing a ventilation device in the tunnel having an excellent dust collection effect. can do.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same number is attached | subjected about the member which has the same effect | action, and the detailed description is abbreviate | omitted.

  1 is a plan sectional view of a tunnel provided with a ventilation device in a tunnel according to a first embodiment of the present invention, FIG. 2 is a side sectional view thereof, and FIG. 3 is a front sectional view seen from the face side thereof. is there. As shown in FIGS. 1 to 3, a ventilation device 1 in a tunnel according to the present embodiment is a so-called air supply type provided in a tunnel 2, and an air supply air pipe 10 and a dust collector 20. have. As shown in FIG. 3, the air supply duct 10 is horizontally provided at a slightly lower position near the uppermost part of the center and slightly to the left as viewed from the face 3 side of the tunnel 2.

  The air supply tube 10 includes an air supply tube main body 11 and a branch air tube 12. The air supply pipe main body 11 is made of vinyl and extends from the outside of the wellhead 4 in the tunnel 2 to the face working area 5 to form a ventilation path for supplying clean air to the face working area 5. is doing. The face working area 5 is an area where work is performed in the vicinity of the face 3 and its length L is slightly different depending on the type of work, but is set within a range of 30 to 100 m from the face 3. The air supply pipe body 11 is formed by connecting vinyl cylinders having a certain length, for example, a length of about 10 m. By connecting these cylinders sequentially, the air supply wind pipe 11 is formed. The tube body 11 can be extended.

  A vinyl branch air pipe 12 is attached to an end of the air supply air pipe body 11 on the face surface 3 side. As shown in FIG. 4, the branch air pipe 12 includes a main air outlet 13 and four branch air outlets 14 to 17 arranged in parallel with each other, and is formed at the center of the side of the branch air pipe 12. The air diverted by the branched branches is sent to the respective outlets 13-17. Of these, the main air outlet 13 is arranged toward the face 3 of the tunnel 2, and the branch air outlets 14 to 17 are arranged obliquely downward in the radial direction of the tunnel 2. Therefore, the air blown out from the main outlet 13 goes directly to the face surface 3.

  The air blown out from each of the branch outlets 14 to 17 is in the face working area 5 and is in a direction avoiding the face face 3, and at the lower side in the radial direction of the tunnel 2 at the position where they are blown out. Head. Immediately after being blown out, the air blown out from the branch outlets 14 to 17 flows in a direction along the face 3, that is, a direction parallel to the face 3. Since the direction in which the branch outlets 14 to 17 are directed is on the opposite side of the tunnel 2 to the position where the air supply pipe 10 is approached, the air blown from the branch outlets 14 to 17 is tunneled. It becomes easy over the whole area of the cross-sectional direction in 2. Further, the distance between the opening of the main air outlet 13 and the first branch air outlet 14 closest to the face surface 3 in the four branch air outlets 14 to 17 is within 10 m, for example, 5 m, 3 m, and the like. desirable. However, it can also be arranged at a position exceeding 10 m.

  A ring-shaped shape retaining member is provided at the opening of the main air outlet 13 to maintain the shape of the opening tip at a circular shape. Similarly, each of the four branch outlets 14 to 17 is provided with a ring-shaped shape-retaining member, and the shape of the opening end is maintained circular. Moreover, the opening area adjustment means 13A-17A which adjusts those opening areas is formed in each longitudinal direction intermediate position of each blower outlet 13-17. Each of the opening area adjusting means 13A to 17A is composed of a string-like member that is passed through a through hole that extends in the circumferential direction of the corresponding outlet 13 to 17. By tightening the string-like member, the opening area of the air outlets 13 to 17 is narrowed. Conversely, by loosening the string-like member, the opening area of the air outlets 13 to 17 is widened.

  Further, a blower 18 disposed outside the tunnel 2 is connected to the other end side of the air supply wind pipe body 11 in the air supply wind pipe 10. The blower 18 supplies clean air outside the tunnel 2 to the air supply pipe 10.

  On the other hand, the dust collector 20 includes a dust collector 21 and an exhaust wind pipe 22. The dust collector 21 is a self-propelled type and has a traveling unit 21A. A known dust collector main body 21B having a function of removing dust from air containing dust or the like, for example, a dry type equipped with a bag filter or an electric type is appropriately provided on the traveling unit 21A. . On the side of the wellhead 4 of the dust collector 21, a discharge port 21 </ b> C for discharging air after removing dust is formed, and on the facet 3 side of the dust collector 21, the end on the wellhead side of the exhaust wind pipe 22 is connected. Has been. The exhaust wind pipe 22 is made of a stretchable vinyl telescopic wind pipe having flexibility, and is suspended by a rail portion 23 attached to the ceiling portion of the tunnel 2. Driving means such as an electric motor (not shown) is provided at the distal end portion of the exhaust wind pipe 22, and the driving means such as the electric motor is operated so that the distal end portion of the exhaust wind pipe 22 extends along the rail portion 23. By moving, the exhaust wind pipe 22 is configured to expand and contract in the tunnel direction of the tunnel 2. Further, the exhaust wind pipe 22 is provided with a ring-shaped shape retaining member (not shown) to prevent the exhaust wind pipe 22 from being crushed and blocked by the intake force of the dust collector 21.

  At the end of the exhaust air pipe 22 on the face surface 3 side, an air inlet 24 for taking in air is formed, and during the ventilation work, the air inlet 24 is a branch outlet in the air supply pipe 10. It is located closer to the face surface 3 than 14-17. The dust collector 21 sucks air containing dust in the face work area 5 through the exhaust wind pipe 22 and removes dust contained in the air. The air purified by removing the dust is discharged from the discharge port 21C. The dust collector 20 can also include a device that removes toxic substances (gas) such as hydrogen sulfide and sulfur dioxide.

  On the other hand, a free-section excavator M is disposed on the face surface 3 in the tunnel 2 to perform excavation work on the face surface 3.

  The operation of the ventilation device in the tunnel according to the present embodiment having the above configuration will be described.

  In the face work area 5 in the tunnel 2, in addition to excavation work by the free section excavator M as shown in FIGS. 1 and 2, face work such as blasting work, projecting work, concrete spraying work, and the like are performed. The ventilation device 1 of the tunnel 2 removes dust generated when the face work is performed to reduce the dust concentration in the tunnel 2, particularly in the face work area 5. When ventilating the tunnel 2, the blower 18 is driven to supply clean air such as outside air into the air supply duct 10.

  The clean air supplied into the air supply tube 10 passes through the air supply tube main body 11 and reaches the branch air tube 12. In the branch wind pipe 12, the air flow is branched in the branch passage, and clean air is blown out from each of the main outlet 13 and the branch outlets 14 to 17. The amount of air blown out from each of the air outlets 13 to 17 is determined by loosening or tightening the string-like members provided as the opening area adjusting means 13A to 17A provided in the air outlets 13 to 17, respectively. Adjusted.

  On the other hand, in the dust collector 20, the dust collector 21 is driven to suck in air containing dust in the face work area 5 through the exhaust wind pipe 22. The air sucked by the dust collector 20 passes through the exhaust wind pipe 22 and reaches the dust collector 21. In the dust collector 21, dust contained in the air is captured and removed, and the cleaned air is discharged from the discharge port 21C on the wellhead 4 side.

  Here, the flow of air and dust in the tunnel 2 will be described. As shown in FIG. 5, the clean air CA supplied from the blower 18 is diverted by the branch passage of the branch wind pipe 12 and blown directly from the main blower outlet 13 to the face surface 3. The clean blown air CA blown directly to the face surface 3 absorbs dust generated by the face work and becomes contaminated air FA containing dust. The contaminated air FA containing dust or the like is rebounded to the face surface 3 and tends to flow toward the wellhead 4 side of the tunnel 2.

  In contrast, the dust collector 20 drives the dust collector 21 to suck in the contaminated air FA in the face work area 5 through the exhaust wind pipe 22 with an intake amount larger than the amount of air supplied by the blower 18. Yes. However, simply trying to inhale the contaminated air FA by the intake force of the dust collector 20, the contaminated air FA in the face working area 5 tries to move to the wellhead 4 side without passing through the exhaust wind pipe 22. . As a result, in order to completely intake the contaminated air FA in the face work area 5, a very large intake force is required. On the other hand, in the ventilator 1 according to the present embodiment, clean air CA is blown out from the branch outlets 14 to 17 in the branch wind pipe 12. The air CA blown out from the branch outlets 14 to 17 is discharged in the vicinity of the face work area 5 and at a position closer to the wellhead 4 than the face face 3. In addition, the intake port 24 of the exhaust wind pipe 22 in the dust collector 20 that performs intake air in the face work area 5 is disposed closer to the face surface 3 than the branch outlets 14 to 17. For this reason, the air CA blown from the branch outlets 14 to 17 forms the air curtain AC. By this air curtain AC, the flow of the contaminated air FA which is bounced back to the face surface 3 and flows toward the wellhead 4 side of the tunnel 2 is prevented without requiring a very large intake force.

  Further, in the face work area 5, an intake port 24 of the exhaust wind pipe 22 in the dust collector 20 is disposed. Contaminated air FA that has been prevented from moving toward the wellhead 4 by the air curtain AC is sucked into the exhaust wind pipe 22. The contaminated air FA sucked into the exhaust wind pipe 22 passes through the exhaust wind pipe 22 and is conveyed to the dust collector 21. The dust collector 21 removes dust and the like contained in the contaminated air FA to obtain clean air CA, and then is discharged from the discharge port 21C. At this time, the intake air amount by the dust collector 20 is set to be larger than the air supply amount by the blower 18. For this reason, since negative pressure is generated in the vicinity of the face work area 5, the air CA discharged from the discharge port 21C of the dust collector 20 moves toward the face face 3 side. Since the air curtain AC can be more reliably formed by the movement of the air CA discharged from the discharge port 21 </ b> C, the contaminated air FA in the face work area 5 does not pass through the dust collector 20 and is a wellhead of the tunnel 2. It can prevent suitably moving to the 4 side. Further, in this way, the air CA discharged from the discharge port 21C flows to the face surface 3 side, so that an air curtain AC is provided in the vicinity of the intake port 24 without using a very large dust collector 20. And an excellent dust collecting effect can be exhibited.

Specifically, for example, it is assumed that 1200 m ³ / min of air is supplied by the blower 18. If the air containing dust or the like in the face work area 5 is preferably sucked without forming the branch wind pipe 12, the suction force of the dust collector 20 needs to be about 2300 m ³ / min. there were. On the other hand, when the branch air pipe 12 is used for the air supply pipe 10 as in the ventilator 1 according to the present embodiment, the intake force of the dust collector 20 is set to about 1500 m ³ / min. As a result, air containing dust and the like in the face work area 5 could be suitably removed. From this result, it can be seen that by providing the branch wind tube 12 as in the present embodiment, the dust collection effect can be improved while using a dust collector smaller than the normal method.

  In the ventilation device 1 according to the present embodiment, a stretchable telescopic wind tube is used as the exhaust wind tube 22. For this reason, for example, at the time of the blasting operation for blasting the face surface 3, the exhaust wind tube 22 is contracted in the tunnel direction of the tunnel 2 to prevent the exhaust wind tube 22 from being damaged by the blasting operation.

  Next, another embodiment of the present invention will be described. FIG. 6A is a plan sectional view of a ventilation device in a tunnel according to the second embodiment of the present invention, and FIG. 6B is a view of the ventilation device in the tunnel according to the third embodiment of the present invention. FIG.

  As shown in FIG. 6 (a), the ventilator 40 in the tunnel according to the second embodiment is the same as the ventilator 1 according to the first embodiment as a component and is fed by the blower 18. Only the volume is different. In the ventilation device 40 according to the present embodiment, the air supply amount of the blower 18 is set to be larger than the intake amount of the dust collector 21. For the sake of brevity, only the first branch outlet 14 is shown for the branch wind pipe 12.

  In the ventilation device 40 in the tunnel according to the present embodiment having such a configuration, the amount of air sent from the blower 18 is set larger than the intake amount of the dust collector 21. As shown in FIG. 6A, clean air CA blown out from the main outlet 13 is directly blown out to the face surface 3 at this time. The clean blown air CA blown directly to the face surface 3 absorbs dust generated by the face work and becomes contaminated air FA containing dust. This contaminated air FA is bounced off the face surface 3 and tends to flow toward the wellhead 4 side of the tunnel 2.

On the other hand, as in the first embodiment, the dust collector 20 sucks the contaminated air FA in the face work area 5. On the other hand, the clean air CA supplied from the blower 18 is diverted by the branch path in the branch wind pipe 12 and blown out from the branch outlet 14 in addition to the main outlet 13. Here, in this embodiment, the air supply amount by the blower 18 is made larger than the intake amount by the dust collector 21. For this reason, a part of the clean air CA blown out from the first branch outlet 14 flows to the face surface 3 side, and the remaining part flows to the wellhead 4 side. As a specific relationship between the air supply amount of the blower 18 and the intake amount of the dust collector 21, for example, the air supply amount of the blower 18 can be 1800 m ³ / min, and the intake amount of the dust collector 21 can be 1500 m ³ / min.

  The air curtain AC is formed by the clean air CA flowing on the face surface 3 side, and the air curtain AC circulates the contaminated air FA that is bounced back to the face surface 3 and flows toward the wellhead 4 side of the tunnel 2. Be blocked. In this way, the air CA discharged from the branch outlet 14 flows to the face surface 3 side and the wellhead 4 side, so that a very large dust collector 20 is not used, and the vicinity of the inlet 24 is used. The air curtain AC can be formed and an excellent dust collecting effect can be exhibited.

  Next, a third embodiment of the present invention will be described. As shown in FIG. 6 (b), the ventilator 50 in the tunnel according to the present embodiment has a branch outlet 14 provided closer to the wellhead 4 than the dust collector 21 compared to the first embodiment. This is different from the first embodiment. Other configurations are the same as those in the first embodiment.

  In the ventilator 50 according to the present embodiment having such a configuration, the clean air CA supplied from the blower 18 is diverted by the branch passage of the branch wind pipe 12 and is sent to the main outlet 13 as in the first embodiment. Is blown out directly against the face 3. The clean blown air CA blown directly to the face surface 3 absorbs dust generated by the face work and becomes contaminated air FA containing dust. This contaminated air FA is bounced off the face surface 3 and tends to flow toward the wellhead 4 side of the tunnel 2.

  At this time, the intake air amount by the dust collector 20 is set to be larger than the air supply amount by the blower 18. For this reason, since negative pressure is generated in the vicinity of the face work area 5, the air CA discharged from the discharge port 21C of the dust collector 20 (dust collector 21) will move to the face face 3 side. And Further, clean air CA supplied from the blower 18 is blown out from the branch wind pipe 12. Since this air CA is disposed closer to the wellhead 4 than the outlet 21C of the dust collector 20, clean air CA discharged from the outlet 21C of the dust collector 20 moves to the face 3 side. Will be supported. As described above, the clean air CA discharged from the discharge port 21C of the dust collector 20 is preferably moved to the face 3 side, so that the air curtain AC is formed in the vicinity of the intake port 24 of the exhaust wind pipe 22. Can do. Due to the action of the air curtain AC, the air curtain AC can be suitably formed in the vicinity of the intake port 24 of the exhaust wind pipe 22 even when a dust collector smaller than the normal method is used. Therefore, the air curtain AC can be formed in the vicinity of the air inlet 24 of the dust collector 20 in the tunnel of the tunnel 2 without using a very large dust collector, thereby enhancing the dust collection effect.

  As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to the said 1st-3rd embodiment. For example, in each of the above embodiments, the four branch outlets 14 to 17 formed in the branch air pipe 12 (air supply air pipe 10) are all in the longitudinal direction of the air supply air pipe 10 (branch air pipe 12). However, as shown in FIG. 7A, it is also possible to adopt a mode in which the angles are different from each other. A branch wind pipe 60 as shown in FIG. 7A includes a cylindrical branch wind pipe body 61, and a main outlet 62 is formed at the tip of the branch wind pipe body 61. 1 is connected to the rear end of the branch air pipe body 61. As shown in FIG. On the side of the branch wind pipe main body 61, four branch outlets 63 to 66 are provided as wind direction adjusting means spaced apart from each other at a predetermined interval in the longitudinal direction. Among these, the first branch outlet 63 and the second branch outlet 64 are arranged around the central axis of the branch wind pipe body 61 at a certain angle. Further, the second branch outlet 64 and the third branch outlet 65, and the third branch outlet 65 and the fourth branch outlet 66 form a certain angle around the central axis of the branch wind pipe body 61, respectively. Placed in position. Further, although not shown in the figure, the opening area adjusting means similar to that shown in FIG. The branched wind tube 60 having such a configuration can also be used.

  Further, a branch air pipe 70 as shown in FIG. 7B can also be used. As shown in FIG. 7 (b), the branch wind tube 70 according to this aspect includes a cylindrical branch wind tube main body 71, and a main air outlet 72 is formed at the tip of the branch wind tube main body 71. Yes. The main air outlet 72 is provided with an opening area adjusting means 72A similar to that shown in FIG. 4 (see FIG. 8). Openings 73 </ b> A to 73 </ b> D serving as branch outlets are formed on the side surface of the branch wind tube main body 71 so as to be spaced apart at equal intervals in the longitudinal direction of the branch wind tube main body 71. These openings 73A to 73D are fitted with net-like protective members 74A to 74D, which prevent foreign matter from entering the branch wind tube main body 71 from the openings 73A to 73D and damage to the openings 73A to 73D. is doing. A ring-shaped shape retaining member (not shown) is provided between the adjacent openings 73A to 73D. By this shape retaining member, the branch wind tube main body 71 is prevented from being blocked by torsion or the like, and the open states of the openings 73A to 73D are reliably maintained.

  Furthermore, as shown in FIG. 8, the branch wind tube 70 is provided with lower shutter members 75A to 75D and upper shutter members 76A to 76D that cover the openings 73A to 73D. These shutter members 75 </ b> A to 75 </ b> D and 76 </ b> A to 76 </ b> D are constituted by cut portions when the openings 73 </ b> A to 73 </ b> D are formed from the branch wind tube main body 71. Therefore, the shutter members 75 </ b> A to 75 </ b> D and 76 </ b> A to 76 </ b> D are made of the same material as that of the branch wind tube main body 71.

  Further, fastener members 77A to 77D are provided at both ends of the openings 73A to 73D, respectively. The shutter members 75A to 75D and 76A to 76D are also provided with fastener members (not shown) that respectively engage with the fastener members 77A to 77D, and the fastener members 77A provided in the openings 73A to 73D. The shutter members 75A to 75D and 76A to 76D cover the openings 73A to 73D, respectively, by meshing with the .about.77D.

  According to the shutter members 75A to 75D and 76A to 76D, the air direction adjustment and the opening area adjustment at the branch outlet of the present invention can be performed in the same manner, and the branch is made depending on the open / closed state of the shutter members 75A to 75D and 76A to 76D. The opening areas and directions of the openings 73A to 73D serving as the air outlets are adjusted. For example, as shown in FIG. 9A, when both the lower shutter member 75 and the upper shutter member 76 are closed, the opening 73 is closed and air does not blow out. Further, as shown in FIG. 9B, when the lower shutter member 75 is opened and the upper shutter member 76 is closed, air is blown out downward. Further, as shown in FIG. 9C, when both the lower shutter member 75 and the upper shutter member 76 are open about half, the air is blown out substantially in the horizontal direction. Then, as shown in FIG. 9D, when the lower shutter member 75 is closed and the upper shutter member 76 is open, air is blown upward. In the branch wind pipe 70 according to this aspect, the openings 73 </ b> A to 73 </ b> D serve as branch outlets, and the branch outlet does not protrude from the branch wind pipe body 71. For this reason, it is possible to eliminate a situation in which an arm of a heavy machine working in the tunnel 2 collides with the projecting branch wind pipe and interferes with the work, so that it contributes to smooth work in the narrow tunnel 2. it can.

  Further, when these branch wind tubes are used, the directions of the air blown out are different as shown in FIG. 10 (a-1) and (a-2) show the branched wind pipes used in the first to third embodiments (see FIG. 4), (b-1) and (b-2) show the drawings. The branch wind tubes shown in FIG. 7 (a) and (c-1) and (c-2) are the branch wind tubes shown in FIG. 7 (b). In the branch wind pipe 12 shown in FIG. 4 used in the above embodiments, air is blown out in the same direction from the branch outlets 14 to 17 as shown in FIG. From these branch outlets 14-17, as shown to FIG. 10 (a-2), air blows off toward a lower side.

  Moreover, in the branch wind pipe 60 shown to Fig.7 (a), as shown to FIG.10 (b-1), air blows off from the branch blower outlets 63-66 to a respectively different height direction. Specifically, as shown in FIG. 10 (b-2), air is blown out from the first branch outlet 63 toward the lower side of the side, and from the second branch outlet 64 at the lower side of the side. Thus, air is blown out slightly above the first branch outlet 63. Further, air is blown out from the third branch outlet 65 in a substantially horizontal direction, and air is blown out from the fourth branch outlet 66 to the upper side. In this way, air is blown from the branch outlets 63 to 66 in different height directions, so that air can be blown in a wide range in the cross-sectional direction of the tunnel 2. Therefore, this is an effective mode for forming the air curtain AC when the cross-sectional area of the tunnel 2 is large.

  Furthermore, in the branch wind pipe 70 shown in FIG. 7B, air can be blown out in various height directions depending on the opening degree of the shutter members 75 and 76. For example, in the embodiment shown in FIG. 10 (c-1), all the shutter members 75A to 75D and 76A to 76D are fully opened. In this state, as shown in FIG. 10 (c-2), air can be blown out from each of the openings 73A to 73D in a wide range in the height direction. Moreover, the height direction which blows off air can be adjusted by adjusting the opening degree of shutter member 75A-75D, 76A-76D.

  Moreover, in the said embodiment, although the wind direction adjustment means is provided only in the branch wind pipe shown in FIG. 7, it can also provide a wind direction adjustment means in another branch wind pipe. For example, in the branch wind pipe 60 shown in FIGS. 10B-1 and 10B-2, the air direction in the height direction is adjusted by opening and closing part of the four branch outlets 63-66. be able to.

  On the other hand, in each said embodiment, although it is set as the aspect which provides a branch blower outlet in four places, these can also be set as the aspect made into 1 or 2 or more other plurality.

It is a plane sectional view of the tunnel provided with the ventilation apparatus in the tunnel which concerns on 1st Embodiment. It is a sectional side view of the tunnel provided with the ventilation apparatus in the tunnel which concerns on 1st Embodiment. It is a front sectional view of a tunnel provided with a ventilation device in the tunnel according to the first embodiment. It is a perspective view of a branch wind pipe. It is a plane sectional view for explaining the flow of the air in the tunnel provided with the ventilation device in the tunnel concerning a 1st embodiment. (A) is a plane sectional view of the ventilation device in the tunnel according to the second embodiment of the present invention, (b) is a plan sectional view of the ventilation device in the tunnel according to the third embodiment of the present invention. is there. (A) is a perspective view of the branch wind pipe which concerns on another aspect, (b) is a perspective view of the branch wind pipe which concerns on another aspect. It is a side view of the branch wind pipe which concerns on another aspect. (A)-(d) is a front sectional view for demonstrating the relationship between the opening degree of the shutter member of the branch wind pipe which concerns on another aspect, and the direction of the air which blows off from an opening part. (A-1) is a side view for explaining the flow of air blown out from the branch wind tubes used in the first to third embodiments, (a-2) is a sectional view thereof, (b- 1) is a side view for explaining the flow of air blown out from a branch wind pipe according to another embodiment, (b-2) is a cross-sectional view thereof, and (c-1) is still another embodiment. The side view for demonstrating the flow of the air which blows off from the branch wind pipe which concerns, (c-2) is the sectional drawing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,40,50 ... Ventilation apparatus 2 ... Tunnel 3 ... Face face 4 ... Wellhead 5 ... Face work area 10 ... Air supply pipe 11 ... Air supply air pipe main body 12, 60, 70 ... Branch air pipe 13,62,72 ... Main air outlets 13A-17A, 72A ... Opening area adjusting means 14-17, 63-66 ... Branch air outlet 18 ... Blower 20 ... Dust collector 21 ... Dust collector 22 ... Exhaust air duct 23 ... Rail part 24 ... Inlet 61 , 71 ... Branch air pipe main bodies 73A to 73D ... Openings 74A to 74D ... Protection members 75A to 75D ... Lower shutter members 76A to 76D ... Upper shutter members 77A to 77D ... Fastener members AC ... Air curtain CA ... Clean air FA ... polluted air

Claims (7)

In the ventilation device in the tunnel that ventilates the inside of the tunnel,
The air supply pipe formed with an air outlet for blowing air toward the face of the tunnel and the air in the face working area in the tunnel are sucked, and dust contained in the air is removed and discharged. Having a dust collector with an exhaust wind pipe,
A branch passage that divides the air passing through the interior is formed in the air supply pipe, and a main blowout port that blows air toward the face side, and the face in the face working area in the tunnel A branch outlet that blows the diverted air is formed at a position that avoids the surface,
A ventilation device in a tunnel, wherein an intake port in the exhaust wind pipe is disposed closer to a face side of the tunnel than a branch outlet in the air supply pipe.   The ventilation apparatus in a tunnel according to claim 1, wherein the exhaust wind pipe is a telescopic wind pipe that is extendable and retractable along a tunnel direction of the tunnel.   The ventilation apparatus in a tunnel according to claim 1 or 2, wherein an opening area adjusting means for adjusting an opening area of a main outlet and a branch outlet in the air supply pipe is provided.   The ventilation apparatus in a tunnel according to any one of claims 1 to 3, wherein the branch wind pipe includes a plurality of branch outlets.   The ventilation apparatus in a tunnel according to any one of claims 1 to 4, wherein a wind direction adjusting means for adjusting a wind direction of air blown from the branch outlet is provided.   The ventilating apparatus in a tunnel according to any one of claims 1 to 5, wherein the branch outlet in the branch wind pipe includes an opening formed by cutting out a side surface of the branch wind pipe. .   The ventilation apparatus in a tunnel according to claim 6, wherein the opening area adjusting means includes a shutter that covers the opening.

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