JP2018031129A - Air-conditioning support system in tunnel - Google Patents

Abstract

[Problem] To provide an underground air conditioning support system that can simply and quickly suppress obstacles to ventilation and cooling from an outside air inlet to an underground working area as underground operations progress, thereby maintaining the efficiency of ventilation and cooling. [Solution] An outside air inlet (2) that communicates with the outside of the mine (1) at a windward position of a working area (20) and can introduce clean outside air (E) to at least the working area (20), and the outside air The shortest ventilation path (40) from the inlet (2) to the work area (20), and the blower ( 30), a blower duct (43) that communicates from the blower (30) to the work area (20), and a blower duct (43) that cools the outside air (E) and turns it into cold air (F). A cooling means (32) and a curtain device (60) that is disposed at a blocking position (52) capable of blocking communication with a loophole (50) related to a ventilation path (40) and can be opened and closed are provided. [Selection diagram] Figure 1

Description

  The present invention relates to an underground air-conditioning support system that prevents the diffusion of cold air at an arbitrary location in a tunnel. More specifically, the present invention relates to an underground air conditioning support system that suppresses leakage from a ventilation path from an outside air inlet to a work area, thereby improving cooling and ventilation efficiency.

  It is indispensable to implement environmental conservation measures to maintain the health of underground miners in manned mines. In particular, the work area in the inner part of the mine far from the pit has the following four environmental deterioration factors, which deteriorate the mine air. The first factor is dust associated with blasting (blasting), excavation, spraying, and the like. The second factor is the exhaust gas from the underground working vehicle. The third factor is also mine gas. As a fourth factor in addition to this, there are environmental deterioration factors such as high temperature and high humidity due to geothermal heat and hot water jetted out.

  Therefore, as an environmental preservation measure in the mine, first, fresh and clean air is blown from outside the mine toward the work area inside the mine to ventilate the inside of the mine. In particular, if the work area is hot, ventilate with air conditioning. Therefore, the work area is cooled by blowing cooled air (hereinafter also referred to as “cold air”) through the blower pipe. Moreover, it is necessary for ventilation to have both ventilation and exhaust.

  That is, it is also necessary to discharge underground air containing dust and various gases (hereinafter also referred to as “contaminated air”) and hot underground air from the underground. In addition, as an exhaust method, there are a method in which an exhaust pipe is installed in a tunnel and the exhaust is discharged, and a method in which the exhaust is discharged through a tunnel without an exhaust pipe. Also, if the exhaust pipe can be omitted, no harmful gas is generated, or if dust removal processing can be completed locally with a dust remover installed in the work area, the work area is humid and even if dust is generated for a short time. In this case, the amount of dust adsorbed on the wall surface and bottom surface of the tunnel and floating in the air in the work area is judged to be minute and harmless.

  Ducts such as blast pipes and exhaust pipes are often installed near the tunnel ceiling (see FIG. 5). The same applies to general tunnels as well as mining tunnels. Similar to general tunnels, the cross section perpendicular to the forward and backward direction of the mine shaft (hereinafter also referred to as “the mine shaft cross section”) is generally arched from the viewpoint of strength, and the mine width and mine height are comparable. There are many cases. The size of the mine cross section is set to the minimum necessary to allow the underground work vehicle to pass through from the viewpoint of reducing the excavation cost.

  Therefore, the width of the mine shaft is a necessary minimum width through which the mine work vehicle can pass and has no margin, and is narrow enough to make contact with the left and right wall surfaces when the mine work vehicle passes through the mine shaft. On the other hand, the shape of the underground working vehicle is a shape that places importance on stability by keeping the vehicle height below the vehicle width. Therefore, there is a considerable margin in the space above the mine work vehicle with respect to the spatial distance to the mine ceiling. If there is enough room, ducts that are bulky with a considerable diameter can be accommodated, and therefore the blower pipe and the exhaust pipe are often installed on the ceiling of the tunnel.

  As described above, there is known a bidirectional ventilation method in which cold air is supplied by a blower pipe to a working area in the inner part of the mine far from the pit and simultaneously exhausted from the inner part of the mine toward the pit. In such a ventilation method, when the mine ventilation path fluctuates as the mine work progresses, there is a case where the supply amount of cold air toward the work area is insufficient and sufficient cold air may not reach the work area. .

  There is a typical example of the progress mode of the mine work that causes the mine ventilation path to fluctuate. In the first example, a tunnel being excavated may open with another tunnel. As a second example similar to this, there is a case where the upper mine and the lower mine are communicated with each other when the vein between the upper mine and the lower mine is broken and mined from the lower mine by the bench-stopping method. Otherwise, as a general third example, the work area increases or decreases when a new work is started or when a work in progress is divided, so that the mine ventilation path varies.

  When the mining work by the bench-stopping method shown in the second example described above is used to connect the upper tunnel and the lower tunnel, and the mining work is advanced while breaking the communication portion, the communication hole is gradually expanded. Since the expansion trend continues until the mining of the mine is completed, there is a problem that the air flow situation associated with the communication hole also gradually changes.

  Moreover, in an old tunnel that is very complicated and three-dimensionally configured, the connection form may not be grasped by a mine member. In this case, it is difficult to predict the communication situation that changes with the progress of the mining operation, and the ventilation state may change unexpectedly. There is also a problem that it is difficult to reach sufficient cold wind in the working area of such an old mine shaft.

  As described above, the following countermeasures are also known for the problem that the aeration situation continues to fluctuate gradually with the progress of the mine work and the problem that it is difficult for sufficient cold air to reach the work area of the old mine shaft. .

  For example, in Patent Document 1, an air curtain for constantly blowing air in a cross-sectional direction of a tunnel through an independent path of a blower pipe and an exhaust pipe and blocking the work area side tunnel space and the tunnel entrance side tunnel space is always provided. The technology to be formed is described, and it is disclosed that even if a trouble occurs in the blower pipe or the exhaust pipe, the interruption is maintained and the contaminated air has an effect of preventing diffusion to the mine entrance side.

  Further, for example, Patent Document 2 describes a technique for forming a fresh air outlet in a specific shape, and the fresh air is converted into a smooth air stream with less turbulence and delivered to the lower part of the tunnel cross section. Thus, it is disclosed that the formation of an air curtain prevents the contaminated air from leaking out from the lower part of the tunnel cross section.

JP 2008-101329 A JP2015-034385A

  However, the techniques described in Patent Documents 1 and 2 are disadvantageous in terms of equipment cost because an apparatus having a complicated structure is required. In addition, although it is highly effective as a technique for excavating a single mine or tunnel, it has not been considered to deal with the influence of a mine other than the work area stretched in the mine. Furthermore, since both are techniques for suppressing the leakage of contaminated air, the local work area in the mine cannot be sufficiently cooled due to fluctuations in the ventilation path that occurs as the mine work progresses. It is difficult to deal with

  On the other hand, a method of blocking the space of the tunnel cross section and adjusting the ventilation path is also known. That is, by installing a general steel shutter or sheet shutter for partitioning and blocking the space in the cross section of the tunnel, fluctuations in the ventilation state are suppressed.

  However, a general steel shutter or sheet shutter for partitioning has a large burden in terms of installation, removal labor, time, and cost, and thus it has been difficult to flexibly install it as needed.

  The present invention has been made in view of such problems, and the object of the present invention is to easily and quickly suppress obstacles associated with the progress of underground work for ventilation and cooling from the outside air inlet to the underground work area. It is to provide an underground air conditioning support system that can maintain the efficiency of ventilation and cooling.

  The inventors of the present invention have found that the object can be achieved by blocking most of the lower side of the cross section of the tunnel that serves as a passageway that inhibits ventilation to the work area in the mine, and completed the present invention.

The underground air-conditioning support system (101, 102, 103) according to one aspect of the present invention has a ventilation path (40, 41, 42) to a local work area (20, 21) that is air-conditioned in the underground (10). Underground air conditioning support system (101, 102, 103)
An outside air inlet (2) that communicates with the outside of the mine (1) at an upwind position of the work area (20, 21) and that can introduce clean outside air (E) to at least the work area (20, 21);
The shortest ventilation path (40, 41, 42) from the outside air inlet (2) to the work area (20, 21);
A blower (30, 31) disposed in the middle of the ventilation path (40, 41, 42) for blowing the outside air (E) to the work area (20, 21);
An air duct (43, 44, 45) communicating from the blower (30, 31) to the work area (20, 21);
Cooling means (32, 33) interposed in the middle of the air duct (43, 44, 45) to cool the outside air (E) to cool air (F);
A curtain device (60) which is disposed at a blocking position (52, 53, 54) capable of blocking communication with the escape passage (50, 51) related to the ventilation path (40, 41, 42) and can be opened and closed. It is provided.

In the underground air conditioning support system (101, 102, 103) according to one aspect of the present invention, the curtain device (60) includes:
A sheet (70) capable of blocking 50% or more from the lower side near the bottom surface of the tunnel (22, 58) with respect to the area (S) of the opening (55) that can be blocked at the blocking position (52, 53, 54);
A stretching wire (80) stretched in the width (W) direction of the opening (55);
Wire fixing means (83, 84) for fixing both ends (81, 82) of the extension wire (80) to the walls (56, 57) on both sides of the opening (55);
Curtain hanging that suspends the engaging portions (72 to 74) scattered on the upper side (71) of the sheet (70) from the stretching wire (80) so that the extending direction of the stretching wire (80) is movable. It is preferable to provide a member (92-94).

In the underground air conditioning support system (101, 102, 103) according to one aspect of the present invention,
The height (J) of the sheet (70) is from the bottom of the tunnel (22, 58) to the height (J) of the lowest point of the duct (49) disposed near the tunnel ceiling (59),
The width (W2) of the sheet (70) is preferably set to coincide with the width (W) of the opening (55).

In the underground air conditioning support system (101, 102, 103) according to one aspect of the present invention, the curtain device (60) includes:
As an opening / closing mechanism, a curtain opening / closing string (63) capable of bidirectional movement in the extending direction of the extension wire (80) in accordance with an operator's pull string operation,
One of the upper sides (71) is locked to the intermediate part (64) of the curtain opening / closing string (63), and the intermediate part (64) is bidirectional along the extending direction of the extension wire (80). It is preferable that the other of the upper side (71) is fixed to either one of the walls (56, 57) on both sides.

In the underground air conditioning support system (101, 102, 103) according to one aspect of the present invention, the shut-off curtain opening / closing string (63)
It can be bound to the binding portions (61, 62) disposed on the walls (56, 57) on both sides,
Further, the binding portion (61, 62) is provided with a margin based on a stroke (W1) in which the intermediate portion (64) of the curtain opening / closing string (63) is movable in the extending direction of the extension wire (80). It is preferable that it is configured to receive and bind.

  According to the present invention, there is provided an underground air-conditioning support system that can easily and quickly suppress obstacles associated with the progress of underground work for ventilation and cooling from the outside air inlet to the underground work area and maintain ventilation and cooling efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective plan view illustrating a mine shaft intersecting in a lattice shape from above, for explaining Example 1 of a mine air conditioning support system (hereinafter also referred to as “the present system”) according to the present invention. FIG. 5 is a perspective plan view for explaining Example 2 in the tunnel of FIG. 1. In the mine shaft of FIG. 1, FIG. 2, it is a perspective top view for demonstrating Example 3. FIG. FIG. 4 is a longitudinal sectional view for explaining the actual work in the work area of FIGS. 1 to 3, FIG. 4 (A) the actual work during excavation of the blasting hole, and FIG. 4 (B) mining the ore collapsed after the blasting. The actual work status is shown. In this system, it is a front view of the curtain apparatus which interrupts the mine cross section used as a passage. It is a partially expanded front view of a curtain apparatus. It is an external view of the pulley which comprises a part of curtain device, and is FIG. 7 (A) front view and FIG. 7 (B) side view. It is an external view of the L-shaped metal fitting for fixing a curtain apparatus to a pit inner wall surface, and is FIG. 8 (A) front view and FIG. 8 (B) side view. It is a front view of the turnbuckle for fixing a curtain apparatus to a pit inner wall surface. It is a front view of the screw shackle which comprises a part of curtain device. It is a front view of the anchor bolt for fixing a curtain apparatus to a pit inner wall surface. It is a front view of the winding grip for fixing a curtain apparatus to a pit inner wall surface.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, although a schematic model is shown by FIGS. 1-4 about the mine to which this system is applied, the range illustrated there is only a part as the whole mine. Moreover, the mine crossing in the grid | lattice form shown in FIGS. 1-3 is provided with three mine shafts in the vertical direction (north-south direction) and two mine shafts in the horizontal direction (east-west direction) in the sea level X. . In particular, the two mine shafts shown in the transverse direction are each provided on the vein.

The actual mine is not linear. Also, the tunnels along the veins are more complex intersections and branches. It is difficult to faithfully illustrate these shapes, and a schematic model is shown for explanation. In addition, the air is not sent only to the tunnels to which the present system is applied, but air is also sent to other tunnels. In particular, in the vicinity of the mine shafts intersecting in a lattice shape shown in FIGS.
[Example 1]

  FIG. 1 is a perspective plan view illustrating a tunnel that intersects in a lattice shape from above in order to explain the first embodiment of the present system. As shown in FIG. 1, the present system 101 includes an outside air inlet 2, a ventilation path 40, a blower 30, a blower duct 43, a cooling unit 32, and a curtain device 60.

  This system 101 maintains the ventilation path 40 to the work area 20 that is locally air-conditioned in the pit 10 with the above-described configuration. In FIG. 1 to FIG. 3, the grid-like mine shafts on which the present systems 101 to 103 are implemented show a model having a uniform plane configuration at sea level X for convenience of illustration. However, the actual tunnel has a three-dimensional structure that intersects in a complex manner with a difference in elevation. This will be described later with reference to FIG.

  The outside air inlet 2 communicates with the outside 1 of the work area 20 at the windward position, and is configured to be able to introduce clean outside air E up to at least the work area 20. The ventilation path 40 is composed of the shortest path from the outside air inlet 2 to the work area 20. The blower 30 is a device that is disposed in the middle of the ventilation path 40 and blows outside air E to the work area 20.

  The air duct 43 is a vent pipe that communicates from the blower 30 to the work area 20. The cooling means 32 is a device that intervenes in the middle of the air duct 43 and cools the outside air E to make the cold air F. The curtain device 60 is a set of curtain devices that can be opened and closed by being disposed at a blocking position 52 that can block communication with the escape passage 50 related to the ventilation path 40.

  Next, an example of the operation of the system 101 will be described. In addition, natural ventilation G is always flowing through the pit 10 from the left to the right in FIG. Therefore, even if the system 101 is not installed in the mine 10, clean outside air E is circulated to some extent from the outside air inlet 2 communicating with the outside 1 of the work area 20 at the upwind position of the work area 20 toward the work area 20. And are ventilated.

  However, ventilation by the natural ventilation G is not sufficient. For this reason, the present system 101 air-conditions the work area 20 (hereinafter also referred to as “air conditioning”) by energizing the ventilation by the natural ventilation G with the blower 30 and cooling with the cooling means 32.

  In the mine work area 20 shown in FIG. 1, excavation work is performed downward as described later with reference to FIG. In addition to the harsh atmosphere on the human body, the work area 20 needs to be ventilated and cooled because contaminated air that has become hot during excavation works. Therefore, the blower 30 is disposed in the middle of the ventilation path 40. The blower 30 generates a strong artificial wind using the natural ventilation G generated by the outside air E as a tail wind, and blows air to the work area 20 through the blow duct 43.

  Cooling means 32 is interposed in the middle of the air duct 43. In the cooling means 32, the outside air E cooled by exchanging heat with cooling water (not shown) becomes cold air F. In addition, only the hot spring water at a high temperature of 60 ° C. is often obtained in the pit 10, and the hot spring water cannot be applied to cooling water for cooling. Therefore, it is necessary to draw and use low-temperature running water applicable as cooling water for cooling from a separate system from the hot spring water.

  As described above, the present system 101 urges ventilation by the natural ventilation G by the blower 30 and air-conditions the work area 20 by blowing the cold air F cooled by the cooling means 32. Further, in order to reach the work area 20 from the outside air inlet 2, the ventilation path 40 is constituted by the shortest path while being bent twice in a crank shape. A short passage 50 intersects the shortest ventilation path 40.

  The escape passage 50 may be linear from the outside air introduction port 2 communicating with the outside of the mine 1, and the clean outside air E that has flowed out flows out in a large proportion. On the other hand, the clean outside air E reaching the work area 20 is remarkably reduced because it is bent twice in a crank shape. In contrast to this, high-temperature and high-humidity contaminated air drifting in the pit 10 is sent from the air duct 43 to the work area 20 at a high rate. As a result, the effect of ventilation is diminished.

  Therefore, the curtain device 60 is disposed at the blocking position 52 where the communication between the ventilation path 40 and the escape path 50 can be blocked to block the communication. The curtain device 60 appropriately blocks communication between the ventilation path 40 and the escape path 50. In FIG. 1, if the blocking position 52 is blocked by the curtain device 60, the rate at which the strong artificial wind generated by the blower 30 passes along with the natural ventilation G to the escape path 50 also decreases.

  As a result, the present system 101 can efficiently deliver clean outside air E flowing from the outside air inlet 2 to the work area 20 via the ventilation path 40. By improving the ventilation efficiency in this way, it is possible to maintain a favorable environment for the health of mine members. In other words, the present system 101 can efficiently air condition the work area 20 by closing the curtain device 60 and restricting the ventilation to the escape passage 50 and delivering the clean outside air E as the cold air F through the shortest ventilation path 40. Is to help.

<Verification results>
The time required for the operation of installing the curtain device 60 at the blocking position 52 in FIG. 1 is 2 hours. In addition, it took 1 hour for the air conditioning effect of ventilation and cooling to reach the work area 20 and improve the health of the mine members. The total waiting time for excavation work is 3 hours. As will be described later with reference to FIGS. 5 and 6, the opening / closing operation of the curtain device 60 is quickly completed.

Moreover, when the mine temperature on the suction side of the blower 30 was compared with the mine temperature of the work area 20 air-conditioned by the blown cold air F, a decrease of about 2 ° C. was confirmed. In the present system 101, the curtain device 60 is disposed at a blocking position 52 where the communication between the ventilation path 40 and the escape path 50 can be blocked, thereby blocking the communication. As a result, it was possible to obtain a sufficient effect for improving the working environment.
[Example 2]

  FIG. 2 is a perspective plan view for explaining Example 2 in the mine shaft of FIG. In addition, about the requirement which is common throughout each figure, the same code | symbol is attached | subjected and duplication of description is avoided. As shown in FIG. 2, the present system 102 is configured to communicate with the outside 1 of the work area 21 at the upwind position of the work area 21 with respect to the outside air introduction port 2 and to introduce clean outside air E at least up to the work area 21. The ventilation path 41 is composed of the shortest path from the outside air inlet 2 to the work area 21. The blower 31 is a device that is disposed in the middle of the ventilation path 41 and blows the outside air E to the work area 21.

  The air duct 44 is a vent pipe that communicates from the blower 31 to the work area 21. The cooling means 33 is an apparatus that intervenes in the middle of the air duct 44 and cools the outside air E to cool air F. The curtain device 60 is disposed at a blocking position 52 where the communication with the escape passage 50 related to the ventilation path 41 can be blocked, so that the curtain device 60 can be opened and closed. Further, the same curtain device 60 is disposed in the ventilation position 41 so as to be freely opened and closed by being disposed at a blocking position 53 that can block a short circuit path from the blowing side to the suction side of the blower 31.

  Next, an example of the operation of the system 102 will be described. In addition, natural ventilation G is always circulating in the pit 10 from the left to the right in FIG. Further, when the system 101 is not installed in the pit 10, the route from the outside air inlet 2 communicating with the outside 1 of the work area 21 at the upwind position of the work area 21 to the work area 21 is a U-turn path along the hairpin curve. Therefore, the clean outside air E hardly circulates in the work area 21 and natural ventilation by natural ventilation G cannot be expected. Therefore, the present system 102 air-conditions the work area 21 by energizing the ventilation by the natural ventilation G with the blower 31 and blowing the cold air F that has cooled the outside air E by the cooling means 33.

  In the work area 21 of the mine shown in FIG. 2, excavation work is underway. The work area 21 needs ventilation and cooling. Therefore, the blower 31 is disposed in the middle of the ventilation path 41. The blower 31 generates a strong artificial wind by using the natural ventilation G by the outside air E as a tailwind, and blows air to the work area 21 by a blower duct 44 bent in a U shape along the hairpin curve. Cooling means 33 is interposed in the middle of the air duct 44. In the cooling means 33, the outside air E cooled by exchanging heat with cooling water (not shown) becomes cold air F.

  As described above, the present system 102 air-conditions the work area 21 by energizing the ventilation by the natural ventilation G by the blower 31 and blowing the outside air E cooled by the cooling means 33 as the cold air F. Further, in order to reach the work area 21 from the outside air inlet 2, the ventilation path 41 is configured with the shortest path while being bent twice so as to form a hairpin curve.

  If this system 102 is not applied, the escape path 50 communicates with the outer peripheral side of the hairpin curve forming the shortest ventilation path 41, and most of the clean outside air E is lost to the escape path 50, so that the ventilation efficiency is significantly deteriorated. ing. In contrast, a large amount of fresh, hot and humid air drifting in the pit 10 is delivered from the air duct 44 toward the work area 21. As a result, the effect of ventilation is diminished.

  In view of this, the curtain device 60 is disposed at the blocking position 52 where the communication between the ventilation path 41 and the escape passage 50 can be blocked, and is appropriately blocked. Furthermore, a curtain device 60 is disposed at a blocking position 53 where the communication from the ventilation path 41 to the passage 51 on the left side of FIG.

  In FIG. 2, if the blocking position 52 is blocked by the curtain device 60, the communication between the ventilation path 41 and the escape path 50 is blocked, so that the strong artificial wind generated by the blower 31 passes along with the natural ventilation G to the escape path 50. The rate also decreases. Further, if the blocking position 53 is blocked by the curtain device 60, the communication between the ventilation path 41 and the escape path 51 is blocked.

  In this case, the wind blown out from the blower outlet of the blower 31 can prevent the phenomenon that the so-called vehicle wind (car wind) is sucked into the suction opening of the blower 31, so that the efficiency of the blower 31 can be maintained without lowering. As a result, the clean outside air E flowing from the outside air inlet 2 can be heat-exchanged by the cooling means 33 into the cold air F and efficiently delivered to the work area 21. In other words, it is possible to increase ventilation efficiency and maintain a favorable environment for the health of mine members.

<Verification of the vehicle wind at the blocking position 53>
It is necessary to supply “fresh air” taken from the outside through the outside air inlet 2 and the like to the suction side of the blower 31. If there is "contaminated air" on the suction side of the blower, the work environment in the work area deteriorates even though it is cooled, and must be avoided. Regardless of contamination or freshness, if there is not enough “air” from the upstream to the air intake side of the air blower to match the air flow of the air blower, The airflow will flow backwards.

When the vehicle wind is generated in this way, even if it is a part of the airflow, it will continue to rotate between the “exit” and the “inlet”, and sufficient cold air will not be supplied to the work area 21. Therefore, at the inlet of the blower 31, it is necessary to supply sufficient and fresh air that matches the ability of the blower. In FIG. 2, even if there is an exhaust flow from left to right as a whole, when the blower 31, the blow duct 44 and the cooling means 33 are installed, the air volume from the outside air inlet 2 is measured, and the validity is Verifying.
[Example 3]

  FIG. 3 is a perspective plan view for explaining Example 3 in the mine shaft of FIGS. 1 and 2. In the mine shaft shown in FIG. 3, excavation work is being performed downward simultaneously in the two work areas 20 and 21. The work areas 20 and 21 require ventilation and cooling. Therefore, the blower 31, the blower duct 44, and the cooling means 33 of the underground air conditioning support system 102 installed in the second embodiment are left as they are. In addition to this state, the blower 30 and the cooling means 32 are relocated to the middle of the ventilation path 42 shown in FIG. 3 from what was disposed in the middle of the ventilation path 40 in FIG.

  In the third embodiment shown in FIG. 3, at least one of the work area 20 of the first embodiment shown in FIG. 1 and the work area 21 of the second embodiment shown in FIG. 2 is air-conditioned. More specifically, the case where either one or both are air-conditioned at the same time is classified into work patterns 1 to 3, and the optimum correspondence is shown respectively. That is, in the work pattern 1, only the work area 20 is air-conditioned. In the work pattern 2, only the work area 21 is air-conditioned. In work pattern 3, both work areas 20, 21 are simultaneously air-conditioned.

  The point that the blower 31 and the cooling means 33 are arranged in the middle of the ventilation path 41 toward the work area 21 and the cold air F is delivered to the work area 21 by the air duct 44 bent in a hairpin curve is shown in FIG. This is the same as the air conditioning for the work area 21 of the second embodiment. In the third embodiment, the curtain devices 60 respectively disposed at the total three blocking positions 52, 53, and 54 are appropriately opened and closed in order to realize optimum air conditioning according to the work patterns 1 to 3. The detailed configuration, installation, and handling of the curtain device 60 will be described later with reference to FIGS.

<Work pattern 1>
When excavation work is performed only in the work area 20 as the work pattern 1 (substantially the same work as the first embodiment), the ventilation state is grasped by the same verification work as the first embodiment. In this case, each of the curtain devices 60 is opened and closed so that the blocking positions 52 and 53 are opened and the blocking position 54 is blocked. Further, the blower 30 and the cooling means 32 disposed in the middle of the ventilation path 42 are operated.

<Work pattern 2>
As work pattern 2 (substantially the same work as in the second embodiment), when excavation work is performed only in the work area 21, the respective curtains are configured so that the blocking positions 52 and 53 are blocked and the blocking position 54 is opened. The device 60 is opened and closed. Further, the blower 31 and the cooling means 33 disposed in the middle of the ventilation path 41 are operated.

<Work pattern 3>
When working in both the work areas 20 and 21 as the work pattern 3, the curtain devices 60 are opened and closed so that the blocking positions 53 and 52 are opened and the blocking position 54 is blocked. Further, in order to air-condition the work area 21, the blower 31 and the cooling means 33 disposed in the middle of the ventilation path 41 are operated. About this, it is the same as that of Example 2 shown in FIG. 2, and the clean outside air E which flowed in from the outside air inlet 2 can be efficiently delivered to the work area 21.

  Simultaneously with the air conditioning of the work area 21, the air blower 30 and the cooling means 32 disposed in the middle of the ventilation path 42 are operated to air condition the work area 20. Here, the clean outside air E flowing in from the outside air inlet 2 is vented without any trouble because the blocking positions 53 and 52 arranged in the middle of the ventilation path 42 are opened.

  Specifically, the curtain device 60 is disposed at a blocking position 54 where the communication with the ventilation path 41 can be blocked on the upstream side of the escape passage 50, and this is blocked as appropriate. In FIG. 3, if the blocking position 54 is blocked by the curtain device 60, the strong artificial wind generated by the blower 31 is blocked from communicating with the ventilation path 41 and therefore does not leak upstream. As a result, the clean outside air E flowing from the outside air inlet 2 can be heat-exchanged by the cooling means 33 into the cold air F and efficiently delivered to the work area 21.

  In other words, since the short-circuit path from the blowing side to the suction side of the blower 30 disposed on the downstream side of the blocking positions 53 and 52 is blocked by the blocking position 54, no vehicle wind is generated. As a result, the clean outside air E flowing in from the outside air introduction port 2 can efficiently contribute to air conditioning in the work area 20 via the ventilation path 42. Thus, by improving the ventilation efficiency, it is possible to maintain a favorable environment for the health of mine members.

<Verification results>
In work patterns 1 to 3, it takes 2 hours to install one curtain device 60. Moreover, as shown in FIG. 3, since the blocking positions 52 to 53 extend over three locations, a total of 6 hours is required for the entire installation. However, in practice, three locations are divided and set up at the same time, so it takes two hours to complete. After the three installations were completed, it took 1 hour for the air conditioning effects of ventilation and cooling to reach the work areas 20 and 21 and improve the health of the mine members. As will be described later with reference to FIGS. 5 and 6, the opening / closing operation of the curtain device 60 is quickly completed.

  The total installation time and air-conditioning propagation time of the curtain device 60 is 3 hours. The three hours are the waiting time for excavation work, but are shorter in time than when a conventional shutter device or the like is used (to be described later in Comparative Examples 1 and 2). Moreover, when the mine temperature on the suction side of the blower 30 was compared with the mine temperature in the work areas 20 and 21 conditioned by the blown cold air F, a decrease of about 1.5 ° C. was confirmed. As described above, the present system 103 shown in FIG. 3 was able to obtain a sufficient effect for improving the working environment while being simple and quick.

  On the other hand, when the present system 103 is not applied, in the work area 20, the escape path 50 communicates with the windward side of the shortest ventilation path 42, and a part of the clean outside air E is washed away to the escape path 50. Deteriorates ventilation efficiency. In contrast to this, a large amount of fresh, hot and humid air drifting in the pit 10 is delivered from the air duct 45 toward the work area 20. As a result, the effect of ventilation is diminished.

Similarly, when the present system 103 is not applied, in the work area 21, the escape passage 50 communicates with the outer peripheral side of the hairpin curve forming the shortest ventilation path 41, and most of the clean outside air E is lost to the escape passage 50. As a result, the ventilation efficiency is significantly degraded. In contrast, a large amount of fresh, hot and humid air drifting in the pit 10 is delivered from the air duct 44 toward the work area 21. As a result, the effect of ventilation is diminished.
[Comparative Example 1]

Instead of applying the present invention in the same situation as in Example 1 in the same location as where the present system 101 was installed in Example 1, it was examined to install conventional (commercial partition) equipment. As a result, it took 3 days only for the construction period required for installation, and the cost for installation required 20 times the cost of installing the underground air-conditioning support system of the present invention. For this reason, the work environment could not be improved.
[Comparative Example 2]

  In the same situation as in the third embodiment, the present invention is not applied at the same position as the place where the system 103 is installed in the third embodiment (three places; two new places), and the conventional (commercial partition) equipment is installed. Considered installation. As a result, the construction period required for installation takes only 3 days, and the cost for additional installation at two locations is 40 times the cost of installing the underground air-conditioning support system of the present invention. did. For this reason, the work environment could not be improved.

  As described above, when the present invention is applied, not only can a sufficient amount of cool air be supplied to the work area, but the period during which the partition device, that is, the curtain device 60 is installed and moved is shorter than those of the first and second comparative examples. In addition, it was confirmed that the cost was greatly reduced.

  In addition, above-mentioned Examples 1-3 and Comparative Examples 1 and 2 contrast the malfunction of the ventilation accompanying the excavation operation | work of digging the hole for the charge in the sea level X, and the presence or absence of the improvement measure. That is, in the first to third embodiments, the present invention is applied to adjust the ventilation rate for the supply of the cold air F to the work areas 20 and 21 in the mine shaft at sea level X. On the other hand, the cases where the present invention was not applied were shown in Comparative Examples 1 and 2 for comparison. However, the present invention does not limit the work types as in these cases. It is clear that the present invention can be applied in the same manner in various operations, for example, ore recovery operations at sea level Y, which will be described later with reference to FIG.

  FIG. 4 is a longitudinal sectional view for explaining the actual work in the work area of FIGS. FIG. 4 (A) shows the actual state of work during excavation of the blasting hole, and FIG. 4 (B) shows the actual state of operation during mining of the ore collapsed after blasting. Hereinafter, with reference to FIGS. 1 to 4, a description will be given of the actual state of work by collapsing the vein between the upper mine and the lower mine by the bench-stopping method and mining from the lower mine. Note that, as described above with reference to FIGS. 1 to 3, the grid-like mine shaft in which the present systems 101 to 103 are implemented is merely a model having a flat plane structure at sea level X for simple description. The actual mine shaft has a three-dimensional structure that intersects intricately with a difference in elevation so that it is difficult to illustrate using FIGS.

  As shown in FIG. 4A, the actual work in the work areas 20 and 21 of FIGS. 1 to 3 is a two-story structure on the bottom surface 22 of the mine shaft at the sea level X, at a sea level Y of about 15 m below. Suppose there is an existing mine. Here, the mining operation proceeds as follows. First, when there is a vein 23 to be mined from the bottom 22 of the mine shaft at sea level X, charge holes 3 to 6 are formed in the bottom surface 22 of the mine shaft at sea level X in order to widen the drill hole. 4 are scheduled to be mined at a later date.

  When these charge holes 3 to 6 are charged and blasted, communication is made so that the ceiling of the tunnel at the sea level Y immediately below collapses. At this time, the vein 23 in the range to be mined collapses into the ore 24 and falls to the mine shaft at the sea level Y directly below. The dropped ore 24 is collected by the work vehicle 39 and transferred to the ground surface (not shown).

  When the recovery of the ore 24 is completed, the bottom surface 22 of the mine shaft in the work areas 20 and 21 becomes a cavity, but backfill is filled as necessary. Zurite is an unnecessary material selected from ore. In other words, the ore is sorted into minerals and basement rocks, and the minerals are sent to the post-process, but the basement rocks are unnecessary and are used for backfilling, called dunes.

  FIG. 5 is a front view of a curtain device that blocks a cross section of a tunnel that becomes a passage in the present system. As shown in FIG. The curtain device 60 includes a sheet (hereinafter also referred to as “blue sheet”) 70, a stretching wire 80, wire fixing means 83 and 84, curtain suspension members (hereinafter also referred to as “screw shackles”) 92 to 94, It is configured with.

  The sheet 70 has an area and a stretched form in which 50% or more can be blocked from below near the bottom surface 58 of the tunnel with respect to the area S of the opening 55 that can be blocked at the blocking positions 52, 53, and 54. As an example of the sheet 70, a commercially available blue sheet is cut into an appropriate size and used. The stretching wire 80 is stretched in the width W direction of the opening 55. The wire fixing means 83 and 84 fix both ends 81 and 82 of the extension wire 80 to both walls 56 and 57, respectively. The screw shackles 92 to 94 are freely movable in the extending direction of the stretching wire 80 by suspending engaging portions 72 to 74 scattered on the upper side 71 of the sheet 70 (hereinafter also referred to as “eyelet holes”) to the stretching wire 80. To. The screw shackles 92 to 94 may be set at three or more locations or more appropriate locking locations.

  Further, the height J of the extending wire 80 is about 2 m from the bottom surface 58 of the tunnel in the opening 55. This height J is set as follows. First, the tunnel opening 55 has a legal standard of width W = 4.1 m and height H = 4.1 m. In addition, as described above, the sheet 70 is required to have an area and a stretched form in which 50% or more can be blocked from the lower side with respect to the area S of the opening 55 that can be blocked at the blocking positions 52, 53, and 54.

  When this condition is applied and the shape of the opening 55 is simplified to a square or a circle, the height J may be set to 50% or more of the height 4.1 m, that is, the height J of 2 m or more. Further, the height J is set to be the same as the lowest point J on the outer periphery of the ducts 49 such as a blower pipe and an exhaust pipe disposed near the tunnel ceiling 59. Therefore, the height J of the seat 70 is adjusted to the height from the bottom surface 58 of the tunnel to the lowest point on the outer periphery of the ducts 49. Alternatively, it may be set lower than that so as not to be buffered in the ducts 49. The width W2 of the sheet 70 is preferably set so as to match the width W of the opening 55. The ducts 49 shown in FIG. 5 may be the air ducts 43, 44, and 45 shown in FIGS. The ducts 49 are not limited to a cylindrical shape.

  FIG. 6 is a partially enlarged front view of the curtain device. As shown in FIG. 6, the curtain device 60 includes a curtain opening / closing string 63, a pulley 89, an L-shaped metal fitting 85, an anchor bolt 87, and a turnbuckle 86. The curtain opening / closing string 63 can be moved bidirectionally in the extending direction of the extension wire 80 according to the operator's pull string operation. The mine member performs an operation of pulling the closing curtain opening / closing string 63 in a direction corresponding to the curtain opening / closing distinction in the curtain device 60.

  The curtain opening / closing string 63 can be bundled with bundling portions (cleat, hereinafter also referred to as “cleats”) 61 and 62 disposed on both side walls 56 and 57 (FIG. 5). The cleats 61 and 62 are preferably configured so that the intermediate portion 64 of the curtain opening / closing string 63 can be bound by receiving a margin based on a stroke W <b> 1 that can move in the extending direction of the extension wire 80.

  A cleat is one of ship mooring equipment and sailing equipment, and is a rope for mooring a ship or a terminal of a rope for sailing or an ear-shaped device for tying up an arbitrary position in an 8-shaped form. Say. Generally, cleats are attached to hulls, piers, and the like. When the rope is locked to the cleat, a knotting method called “cleat knot” is often used.

  Although not shown in the drawings, the bundling portions 61 and 62 are not limited to the cleats described above, and any other shape such as a bobbin shape may be used as long as an extra string-like member can be wound and arranged and fixed. It does not matter. These bundling portions 61 and 62 are not limited to a total of two in one pair, but may be arranged as many as necessary on the walls 56 and 57 on both sides. That is, the bundling portions 61 and 62 find appropriate positions for fixing the ends of the curtain opening / closing string 63 extended according to the open / close state of the curtain device 60 on the walls 56 and 57 on both sides, and arrange them appropriately. Just set up.

  The opening / closing operation of the curtain device 60 is as follows. When the curtain device 60 is in the “closed” state, the mine member moves the curtain opening / closing string 63 shown in FIGS. 5 and 6 in a direction in which the intermediate portion 64 (FIG. 6) moves from the right to the left of the stroke W1. Just pull it. By this operation, the upper side 71 of the seat 70 is closed by the left end being pulled toward the left wall while the right end is fixed to the right wall. When the curtain device 60 is set to the “open” state, the mine member may perform the “open operation” contrary to the “close operation”.

  In this way, the curtain device 60 employed in the present systems 101 to 103 makes the “opening or closing operation” work very quick and easy. This is particularly advantageous when a work vehicle or the like passes through the blocking positions 52, 53, and 54.

  In the curtain device 60, any of the “opening or closing operation” causes a margin on the left or right end of the curtain opening / closing string 63. As described above, this margin allows binding to the cleats 61 and 62 disposed on the walls 56 and 57 on both sides. As a result, the end portion of the curtain opening / closing string 63 can be kept in order and is not obstructed. In addition, in spite of the “closing operation”, the problem that a gap is generated between the side of the sheet 70 and the walls 56 and 57 due to loosening of the curtain opening / closing string 63 can be solved.

  FIG. 7 is an external view of a pulley constituting a part of the curtain device, and is a front view of FIG. 7A and a side view of FIG. 7B. As shown in FIG. 6 and FIG. 7, the pulley 89 changes the reciprocating direction of the curtain opening / closing string 63 from the extending direction of the extension wire 80 to an angle at which a mine member can easily draw. The pulley 89 is fixed to the inner wall at a position slightly higher than both ends of the upper side 71 of the seat 70 with anchor bolts 87.

  FIG. 8 is an external view of an L-shaped bracket for fixing the curtain device to the inner wall surface, and is a front view of FIG. 8A and a side view of FIG. 8B. As shown in FIGS. 6, 7, and 8, the L-shaped metal fitting 85 is also fixed to the inner wall of the opening 55 with an anchor bolt 87. As described above, the L-shaped metal fitting 85 and the anchor bolt 87 are employed as the wire fixing means 83 and 84 for the extension wire 80.

  FIG. 9 is a front view of a turnbuckle for fixing the curtain device to the underground wall surface. As shown in FIGS. 6 and 9, the turnbuckle 86 includes a pair of hooks that are externally formed with male screws formed at respective bases, and female screws that are respectively screwed into the male screws of the pair of hooks. And a special nut formed.

  A right screw is formed on one of the screw sets to be screwed together with the turnbuckle 86, and a left screw is formed on the other. The turnbuckle 86 can be tightened by rotating a special nut, and is also referred to as a “tightening screw”, and is used for tensioning and fixing a wire, a wire rope, or the like.

  As shown in FIG. 6, the turnbuckle 86 fixes both ends 81 and 82 of the stretching wire 80 to both walls 56 and 57 (FIG. 5) of the opening 55, respectively. That is, the turnbuckle 86 is wire fixing means 83 and 84 for the extension wire 80, and is used together with the L-shaped metal fitting 85 and the anchor bolt 87 between the objects to be tightened.

  FIG. 10 is a front view of a screw shackle that constitutes a part of the curtain device. As shown in FIGS. 5, 6, and 10, the screw shackles 92 to 94 constitute a curtain suspension member. That is, one screw shackle 92 to 94 is fitted into each of the locking portions (eyelet holes) 72 to 74 scattered on the upper side 71 of the sheet 70, and these screw shackles 92 to 94 are engaged with the stretching wire 80. As a result, the upper side 71 of the sheet 70 is suspended from the stretching wire 80.

  FIG. 11 is a front view of an anchor bolt for fixing the curtain device to the underground wall surface. As shown in FIGS. 6 and 11, the anchor bolt 87 is configured to be fixed to concrete, a rock wall, or the like. That is, the left side of FIG. 11 is a structure that cannot be removed after being driven into a fixed hole previously drilled in a rock wall or the like. As shown in FIG. 6, the pulley 89 and the L-shaped metal fitting 85 are fixed to both walls 56 and 57 (FIGS. 5 and 6) of the opening 55 with anchor bolts 87, respectively.

  FIG. 12 is a front view of a winding grip for fixing the curtain device to the underground wall surface. The ends 81 and 82 of the stretching wire 80 shown in FIG. 6 are loosened to some extent, and then the winding grip shown in FIG. As a result, both ends 81 and 82 are terminated so as to form a ring-shaped portion having strength. One hook of the turnbuckle 86 is hung on a ring-shaped portion formed at both ends 81 and 82 of the extension wire 80, and the other hook is hung on an L-shaped metal fitting 85. The pair of hooks are tightened by rotating the special nut of the turnbuckle 86. As a result, the stretching wire 80 is loosened and is stretched horizontally between both walls 56 and 57 of the opening 55.

  As shown in FIG. 6, one (left end) of the upper side 71 of the sheet 70 is locked to the intermediate portion 64 of the shut-off curtain opening / closing string 63 by a metal fitting or a wire. The intermediate portion 64 is movable in both directions along the extending direction of the stretching wire 80. The other (right end) of the upper side 71 is fixed to the wall of the opening 55. It is preferable that the sheet 70 has a sufficient margin in the left and right width W2 and can be sufficiently blocked without a gap between the left and right walls 56 and 57. Further, the height (see J in FIG. 5) has a similar margin, and it is preferable that the bottom surface can be sufficiently blocked.

  Also, if the seat weight is too light, it will be used in a slight wind, so it will not be used as a curtain. On the other hand, if the seat weight is too heavy, the burden on the installation and opening / closing operation of the curtain device 60 becomes heavy. In this respect, the blue sheet 70 is also optimal in terms of weight per unit area (hereinafter also referred to as “sheet weight”). That is, even if the blue sheet 70 is swung with the traffic of the mine member, the wobbling is quickly recovered by its own weight. In addition, when there is no traffic of a mine member or vehicle and the curtain device 60 may be kept closed, the side of the seat 70 is connected to the L-shaped metal fitting 85 or the like of the wall surface with a wire (copper binding wire) or the like (not shown). May be.

  The sheet 70 of the curtain device 60 is not limited to a single configuration. As another example (not shown), a curtain that divides into left and right, such as a theater curtain, may be used. In other words, a pair of curtains that divide into two left and right when the stage is viewed from the front may be drawn toward both sleeves when the stage is opened, while being drawn toward the center of the stage when the stage is closed, and may be overlapped and closed by a certain width.

  Furthermore, if the opening / closing mechanism of the curtain device 60 is also compared to a theater curtain, the blocking curtain opening / closing string 63 may have a loop configuration. In that case, the direction of dragging is reversed according to the distinction between curtain opening and closing. Of course, as shown in FIGS. 5 and 6, a configuration in which the curtain opening / closing string 63 reciprocates in the extending direction of the extension wire 80 may be used. In this case, the terminal of the closing curtain opening / closing string 63 to be handed over can be distinguished from the opening / closing of the curtain by holding the right terminal and the left terminal in reverse.

  As shown in FIGS. 1 to 3, the present systems 101 to 103 have curtain devices at the blocking positions 52, 53 and 54 when it is necessary to locally ventilate and cool at least one of the work areas 20 and 21. 60 may be installed. At the blocking positions 52, 53, and 54, the extending wire 80 is stretched at the lowest point height J (FIG. 5) on the outer periphery of the ducts 49. Here, until the cold air F supplied from the air ducts 43, 44, 45 is filled in the range of the height J from the bottom surface 58 of the tunnel, the cold air is prevented from leaking to the outside air inlet 2 and the escape passages 50, 51. it can.

  As a result, the space of the work areas 20 and 21 can be sufficiently cooled. Further, the exhaust of contaminated air having a relatively high temperature is discharged from the open portion formed near the ceiling of the tunnel above the height J to the outside air inlet 2 and the escape passages 50 and 51. Thereby, since the ventilation failure by the ventilation failure of the ventilation path 40, 41, 42 does not arise easily, the blowers 30, 31 are not overloaded. Therefore, the blast does not stagnate.

  Even if the present systems 101 to 103 are implemented, the air flow may be disturbed depending on the frequency of traffic between the mine and the work vehicle, the size of the work space, and the strength of the air blow. In that case, cold air escapes from the blocking positions 52, 53, 54 to the outside air inlet 2 and the escape passages 50, 51, and the effects of ventilation and cooling deteriorate. In other words, when only one curtain device 60 is used, it may be difficult to cool the 20 and 21 spaces in the work area. In such a case, the systems 101 to 103 may be added on the side closer to the outside air inlet 2, that is, on the upstream side of the natural ventilation G.

  Since the curtain device 60 employed in the systems 101 to 103 has a very simple structure as compared with the conventional shutter, not only the opening / closing operation but also the installation and removal are simple, quick, easy and low cost. Thereby, this mine system 101-103 can be installed and removed by a general mine member. In that respect, when installing and removing the conventional shutter, it is far more efficient than at least the work by the shutter installer.

  This system adjusts the ventilation path when there is a problem that it becomes impossible to sufficiently ventilate and cool the local work area in the mine due to the fluctuation of the ventilation path that occurs as the mine work progresses. It is possible to improve. Moreover, this system can be constructed with materials that are easy to procure and a simple configuration. Therefore, the system is easy to install, operate and remove, and can be applied flexibly. Moreover, the overall cost is low, and the industrial value of this system is extremely high.

  The underground air-conditioning support system according to the present invention may be employed in any mine for resource mining.

1 outside, 2 outside air inlet, 3-6 charge hole, 10 inside, 20, 21 working area, 22, 58 bottom of tunnel, 23, 25, 26 (before blasting) vein, 24 (collapsed) ore, 30, 31 Blower, 32, 33 Cooling means, 39 Working vehicle, 40, 41, 42 Ventilation path, 43, 44, 45 Air duct, 49 Ducts (installed on the ceiling of the tunnel), 50, 51 Passage, 52, 53, 54 Blocking position, 55 Opening, 56, 57 Both walls (opening 50), 60 Curtain device, 61, 62 Bundling part (cleat), 63 Shutting curtain opening / closing string, 64 (Interrupting curtain opening / closing string 63) middle part , 70 sheet, 71 (upper side of sheet 70), 72 to 74 (spotted on upper side 71 of sheet 70) locking part (eyelet hole), 80 extension wire, 81, 82 both ends (of extension wire 80), 83 , 84 Wire fixing means, 85 L-shaped bracket, 89 pulley, 92-94 curtain suspension member (screw shackle), 101, 102, 103 underground air conditioning support system, E outside air, F cold wind, H tunnel height, J (ducts 49 The height of the lowermost point of the outer periphery of the wire, the height of the extension wire 80 stretched, the area of S (the opening 55 of the tunnel blocking surface), the width of W (the opening 55), the W1 stroke, W2 (sheet 70) Width), X, Y above sea level

Claims (5)

A mine air conditioning support system that maintains a ventilation path to a local work area that is conditioned in the mine,
An outside air inlet that communicates with the outside of the mine at the windward position of the work area, and can introduce clean outside air to at least the work area;
The shortest ventilation path from the outside air inlet to the work area;
A blower that is arranged in the middle of the ventilation path and blows the outside air to the work area;
A blower duct communicating from the blower to the work area;
Cooling means interposed in the middle of the air duct to cool the outside air to cool air;
A curtain device that is disposed at a blocking position capable of blocking communication with the escape passage related to the ventilation path and is freely openable and closable;
Underground air conditioning support system equipped with. The curtain device
A sheet capable of blocking 50% or more from below near the bottom of the tunnel with respect to the area of the opening that can be blocked at the blocking position;
A stretching wire stretched in the width direction of the opening;
Wire fixing means for fixing both ends of the extension wire to the walls on both sides of the opening;
A curtain hanging member that suspends the engaging portions scattered on the upper side of the sheet from the extending wire and makes the extending direction of the extending wire freely movable,
The mine air conditioning support system according to claim 1, comprising: The height of the seat is
From the bottom of the tunnel to the height of the lowest point of the duct arranged near the ceiling of the tunnel,
The underground air-conditioning support system according to claim 2, wherein the width of the sheet is set to coincide with the width of the opening. The curtain device
As an opening / closing mechanism, it is provided with a shut-off curtain opening / closing string capable of bidirectional movement in the extending direction of the extension wire according to the operator's pull string operation,
One of the upper sides is locked to an intermediate portion of the shut-off curtain opening / closing string, the intermediate portion is movable in both directions along the extending direction of the extension wire, and the other of the upper side is on the both sides The underground air-conditioning support system according to claim 2 or 3, which is fixed to either one of the walls. The curtain opening / closing string is
It is possible to bind to the binding portion disposed on the walls on both sides,
5. The underground air conditioning system according to claim 4, wherein the binding portion is configured to be capable of receiving and binding a margin based on a stroke in which the intermediate portion of the barrier curtain opening / closing string is movable in the extending direction of the extension wire. Support system.