JP2004100217A - Telescopic air duct - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a telescopic air duct which when used for ventilation can be made to fully exhibit its ventilating ability according to the flow of air even when contracted. <P>SOLUTION: The telescopic air duct 1 has a flexible, telescopic air duct body 2. The air duct body 2 has a plurality of ring members 5 attached thereto at appropriate intervals to one another so as to retain the shape of the opening of the air duct body 2. A dust collector 6 with a fan is mounted at the rear end of the air duct body 2 to create a suction force inside the air duct body 2 to suck and remove dust in a tunnel, together with air. A plurality of inner pipes 3 are disposed inside the air duct body 2. Upon contraction of the air duct body 2, the inner pipes 3 move close to or into contact with one another to reduce pressure losses inside the air duct body 2. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a telescopic air tube used for a ventilation device installed in a tunnel, for example.
[0002]
[Prior art]
When constructing a large-scale underground structure or excavating a mountain tunnel, a large amount of dust is generated during the excavation operation. If such dust remains in the tunnel, the health of workers such as pneumoconiosis may be impaired. Therefore, dust in the work area near the face (hereinafter referred to as “face work area”) is particularly removed from the outside of the tunnel. Ventilation devices for discharging air to the air are known. In such a ventilation device, a flexible telescopic air tube having flexibility is used so that the introduction position of the air containing dust can be easily changed in accordance with the progress of tunnel excavation or the like. ing. Then, for example, a blower is provided at the rear end of the air duct, and air containing dust is introduced from the front end by flowing air from the front end to the rear end of the telescopic air duct, and is used in a face working area or the like. Ventilation is performed to remove dust.
[0003]
In such a telescopic air tube, the degree of expansion and contraction of the telescopic wind tube is changed according to the distance between the rear end of the telescopic wind tube in which a blower, a dust collector, and the like are provided, and the front end at which actual suction is performed. Specifically, when the working area for removing dust is close to the installation location of the dust collector or the like, the telescopic air tube is contracted for use. Conversely, when the working area of the face is far from the installation location of the dust collector or the like, the telescopic air tube is extended and used.
[0004]
[Problems to be solved by the invention]
By the way, since this type of telescopic air tube has flexibility, the magnitude of the internal pressure loss changes depending on the degree of expansion and contraction. Specifically, when the telescopic air tube is extended and used, the pressure loss is relatively small. Ventilation that makes full use of its capabilities is possible.
[0005]
However, when the telescopic air tube is used by contracting, the pressure loss in the telescopic wind tube becomes large. For this reason, there is a problem that even if air is flowed in the expansion and contraction wind pipes to perform ventilation, ventilation must be performed in a state where the ventilation capacity corresponding to the flow rate of the flowed air cannot be sufficiently exhibited.
[0006]
In view of the above, an object of the present invention is to provide a ventilation system using a telescopic wind tube, which is capable of sufficiently exhibiting a ventilation capacity according to a flow rate of the flowed air even when the telescopic wind tube is contracted. To provide tubes.
[0007]
[Means for Solving the Problems]
The telescopic wind tube according to the present invention that has solved the above-mentioned problem has a telescopic wind tube body having flexibility, and in a telescopic wind tube that introduces air from one end of the wind tube main body through the wind tube main body, A plurality of non-deformable inner pipes are arranged inside the wind pipe main body so as to be separated from each other in the expansion and contraction direction of the wind pipe main body.
[0008]
In the telescopic air tube according to the present invention, the non-deformable inner tube is provided inside the air tube main body so as to be spaced apart in the expansion and contraction direction of the air tube main body. For this reason, when the air tube main body contracts, a state where these inner tubes are continuous is formed, and pressure loss in the air tube main body can be reduced. Therefore, the ventilation capacity at the time of flowing air can be fully exhibited.
[0009]
Further, it is preferable that a plurality of shape retaining members for retaining the shape of the opening of the wind tube main body are attached to the telescopic wind tube so as to be spaced apart from each other in the direction of expansion and contraction of the wind tube main body.
[0010]
By providing such a shape retaining member, even when air is sucked from the rear end of the telescopic air tube, the telescopic air tube can maintain the shape of the opening. For this reason, even if air is sucked from the rear end of the air duct main body, it is possible to prevent the telescopic air duct from being closed and closed. Can be placed on the side.
[0011]
Further, it is preferable that a plurality of inner tubes be arranged at equal intervals.
[0012]
Since the plurality of inner tubes are arranged at equal intervals in this manner, when the air tube main body is expanded and contracted, the shrinkage ratio can be made uniform. Therefore, it is possible to smoothly move the wind tube main body when expanding and contracting it.
[0013]
Further, an embodiment in which the inner tube is made of metal or resin can be adopted. As the non-deformable inner tube, those made of metal or resin can be suitably used. Among them, those made of metal are generally excellent in that they have high rigidity, and those made of resin are generally excellent in that they are lightweight.
[0014]
Furthermore, the wind pipe main body is formed by connecting a plurality of short wind pipes, and at the end of the short wind pipe, a divided inner pipe forming an inner pipe is provided, and the short wind pipes are connected to each other. At the same time, by connecting the inner tubes, it is possible to form an air tube main body and an inner tube.
[0015]
As described above, by connecting the short air ducts to form the air duct main body and providing the inner pipe at the short portion of the short air duct, the installation of the air duct main body can be facilitated. In addition, even when the entire length of the wind tube main body is adjusted according to the situation at the construction site or the like, the adjustment can be easily performed.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The same elements will be denoted by the same reference symbols, without redundant description.
[0017]
1A and 1B are diagrams showing a telescopic wind tube according to the present invention, wherein FIG. 1A is a side view showing a state where the telescopic wind tube is extended, and FIG. 1B is a side view showing a state where the telescopic wind tube is contracted. . FIGS. 2A and 2B are enlarged views of the telescopic wind tube according to the present invention in a state in which a wind tube main body is removed, and FIG. 2A is an enlarged side view showing a state in which the telescopic wind tube is extended, and FIG. It is an expanded side view which shows the state which contracted. 3A and 3B are enlarged views of the telescopic air tube, wherein FIG. 3A is an enlarged side view of a state where the telescopic wind tube is extended, and FIG. 3B is an enlarged side view of a state where the telescopic wind tube is contracted. In FIG. 3, the inner tubes disposed at both ends are drawn so as to be exposed from the air tube main body, but are actually housed inside the air tube main body.
[0018]
As shown in FIG. 1, a telescopic air tube 1 according to the present embodiment includes an air tube main body 2. The air tube main body 2 is made of, for example, vinyl, has flexibility, and is expandable and contractible. Due to the expansion and contraction of the air tube main body 2, the entire length of the expansion and contraction air tube 1 expands and contracts.
[0019]
As shown in FIG. 2, a plurality of non-deformable hollow inner tubes 3 are provided inside the wind tube main body 2. The inner tube 3 is made of, for example, metal or resin, has a short tubular shape, and has a strength that does not deform even when air flows in the wind tube main body 2. The inner pipes 3 are arranged at regular intervals along the extending direction of the air duct main body 2. For this reason, in either case where the air tube main body 2 is expanded or contracted, the length of the portion of the air tube main body 2 between the adjacent inner tubes 3, 3 is the same as that of the plurality of inner tubes 3, 3,. Almost evenly distributed between them. The width of the inner tube 3 along the direction of expansion and contraction of the wind tube main body 2 is about one third of the distance between the adjacent inner tubes 3 when the wind tube main body 2 is completely extended. Therefore, assuming that the air tube main body 2 is completely contracted and the adjacent inner tubes 3 are all in contact with each other, the length of the air tube main body 2 at that time is determined when the air tube main body 2 is completely extended. Is about a quarter of the length of
[0020]
The width of the inner pipe 3 with respect to the width between the adjacent inner pipes 3 when the wind pipe main body 2 is completely extended can be appropriately set depending on the material of the wind pipe main body 2, the overall length, and the like. However, it is preferable to set it to, for example, about 1/2 to 1/5. If the length is longer than 1/2, the length that can be contracted will be short, and if it is shorter than 1/5, the reduction in pressure loss when the air tube main body 2 contracts will be reduced. However, the length is not limited to this range, and can be set to various lengths.
[0021]
A bell mouth 4 is attached to the tip of the wind tube main body 2. Dust generated from the face working area in the vicinity of the face K in the tunnel T is introduced into the air duct main body 2 via the bell mouth 4 together with air. Further, as shown in FIG. 3, a plurality of metal or resin ring members 5, 5,. The plurality of ring members 5, 5,... Are attached at a constant interval in the expansion / contraction direction (extension direction) of the wind tube main body 2. The ring member 5 has non-deformability (hardness) and is fixed to the surface of the air tube main body 2 from the front side by an adhesive tape (not shown). In this manner, their opening shapes are maintained and the opening shapes are maintained so that the air duct main body 2 is not crushed and the passage is blocked. Further, the adhesive tape prevents the ring member 5 and the air duct main body 2 from deteriorating.
[0022]
A dust collector 6 is attached to the rear end of the air duct main body 2. The dust collector 6 includes a blower (not shown). By driving the blower, a suction force is generated, so that air flows from the front end of the wind tube main body 2 to the rear end of the wind tube main body 2. Has become. Then, dust generated in the vicinity of the face working area is sucked together with air via the bell mouth 4 and sent to the dust collector 6 via the air tube main body 2. The dust collector 6 collects the sent dust. The dust collector 6 is mounted on a vehicle 7, and the dust collector 6 can be moved by moving the vehicle 7. The dust collector 6 and the telescopic air tube 1 constitute a ventilation device in a tunnel.
[0023]
A telescopic drive device 8 is provided above the wind tube main body 2. The telescopic drive device 8 includes a first rail 9 provided diagonally above the tunnel T and a second rail provided below the first rail 9. A ring support member 11 and a roller member 12 are provided on the first rail 9. The ring member 5 is suspended from the ring support member 11 as shown in FIG. The ring support member 11 is provided with a rotation preventing mechanism (not shown) to prevent the ring support member 11 and the ring member 5 from rotating around the vertical axis. The ring support member 11 is provided with the ring members 5 all, and the ring members 5 include those that are suspended from the ring support member 11 and those that are not suspended from the ring support member 11. The number of the ring members 5 suspended from the ring support member 11 is about half of the total number of the ring members 5. Thus, by preventing rotation of about half of the ring members 5 by the ring support member 11, it is possible to prevent the wind tube main body 2 from being twisted.
[0024]
Although a certain number of the ring support members 11 are provided side by side, they are arranged at predetermined intervals in the direction in which the air tube main body 2 extends, and roller members 12 are provided at appropriate intervals therebetween. The roller member 12 is driven by a driving device (not shown), and has a roller mounted on the second rail 10. Can be expanded and contracted. Since these roller members 12 are arranged at equal intervals with a predetermined interval, when the air tube main body 2 is contracted, the entire air tube contracts uniformly. The inner pipe 3 is attached to a part of the roller member 12. For this reason, when the wind tube main body 2 contracts, the plurality of inner tubes 3 move such that their intervals are maintained at equal intervals.
[0025]
The operation of the telescopic air tube 1 according to the present invention having the above configuration will be described.
[0026]
When the excavation work of the tunnel T is performed, a large amount of dust or the like is generated in the face working area near the face K. The dust or the like is suctioned by a blower provided in the dust collector 6 through the expansion / contraction wind tube 1 by applying suction pressure to remove dust, thereby performing ventilation. Now, when the excavation of the tunnel T proceeds and the face K is located far from the vehicle 7, as shown in FIG. 1A, the telescopic wind pipe 1 is used in a state where the wind pipe main body 2 is extended.
[0027]
Here, since the shape of the air tube main body 2 is maintained by the plurality of ring members 5, closing by the negative pressure is prevented, and the opening shape can be maintained. Further, when the air duct main body 2 is in the extended state, the air duct main body 2 is in a state in which the surface thereof is in a tension state, so that when the air is sucked by the blower of the dust collector 6, the pressure loss can be reduced. it can.
[0028]
Subsequently, when the excavation of the tunnel T progresses and the distal end of the telescopic air duct 1 moves away from the face working area, the vehicle 7 is moved in the direction of the face K. Then, in order to reduce the movement of the vehicle 7 as much as possible, the vehicle 7 is brought close to the face K, and as shown in FIG. 1 (b), ventilation is performed with the telescopic air tube 1 contracted. Then, as the excavation of the tunnel T progresses, the telescopic air tube 1 is gradually extended so that ventilation is performed without moving the vehicle 7. Here, when the air pipe main body 2 is in a contracted state, the air pipe main body 2 is in a slack state. Therefore, if the inner pipe 3 is not provided, the pressure loss in the air pipe main body 2 becomes extremely large. And the ventilation efficiency is low.
[0029]
In this regard, a plurality of inner pipes 3, 3... Are provided in the wind pipe main body 2 according to the present embodiment, and as shown in FIG. 2 (b) and FIG. Are contracted, the ends of the adjacent inner tubes 3, 3 approach or come into contact with each other. Since the inner pipe 3 is non-deformable and has a cylindrical shape, the air sucked by the suction force of the blower of the dust collector 6 when the adjacent inner pipes 3 and 3 come close to or come into contact with each other, Passes through the inner tube 3. For this reason, reduction in pressure loss can be prevented, so that ventilation efficiency can be improved.
[0030]
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, as shown in FIG. 4, the inner tube 3 is inserted into the wind tube main body 2 to form the telescopic wind tube 1. However, for example, a mode shown in FIG. 5 may be adopted. In FIG. 5, the telescopic air tube is formed by a plurality of short air tubes 21, and only a connection portion between adjacent short air tubes 21 and 21 is shown. Split inner tubes 22, 22 are attached to both ends of the short wind tubes 21, 21, respectively. The divided inner tube 22 has a shape obtained by cutting the inner tube 3 shown in the above-described embodiment at a central portion in the longitudinal direction, and connects the two divided inner tubes 22 to form the inner tube in the above-described embodiment. A tube of the same shape as 3 is formed. Further, a fastener member 23 is disposed between the short wind tubes 21 and 21. In this manner, the telescopic air tube can be formed by integrally attaching the divided inner tube 22 to the inner end of the short air tube 21 and continuously connecting the short air tubes 21.
[0031]
Further, in the above embodiment, the inner tube 3 is inserted into the inside of the wind tube main body 2. However, for example, a short wind tube in which short wind tubes are continuously connected is used as the wind tube main body. It is also possible to adopt a mode in which an inner pipe is provided in the section. In this case, it is necessary to seal the connecting portion between the inner pipe and the short wind pipe with a sealing material or the like. However, in consideration of assembling the telescopic wind pipe at the site, this mode is the mode shown in the above embodiment. It is easier to assemble.
[0032]
【The invention's effect】
As described above, according to the present invention, when performing ventilation using the telescopic air tube, even when the telescopic wind tube is contracted, it is possible to sufficiently exert the ventilation capacity according to the flow rate of the flowed air. Telescopic air tubes can be provided.
[Brief description of the drawings]
1A and 1B are diagrams showing a telescopic wind tube according to the present invention, wherein FIG. 1A is a side view showing a state where the telescopic wind tube is extended, and FIG. 1B is a side view showing a state where the telescopic wind tube is contracted. .
FIGS. 2A and 2B are enlarged views of the telescopic wind tube according to the present invention in a state in which a wind tube main body is removed, where FIG. 2A is an enlarged side view showing a state where the telescopic wind tube is extended, and FIG. It is an expanded side view which shows the state which contracted.
3A and 3B are enlarged views of a telescopic wind tube, wherein FIG. 3A is an enlarged side view of a state where the telescopic wind tube is extended, and FIG. 3B is an enlarged side view of a state where the telescopic wind tube is contracted.
FIG. 4 is a side view showing a state in which the inner tube is inserted into the air tube main body according to the embodiment of the present invention.
FIG. 5 is a side view showing a state in which an end of a short wind pipe having an inner pipe attached to the end is connected.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Telescopic wind pipe, 2 ... Wind pipe main body, 3 ... Inner pipe, 4 ... Bell mouth, 5 ... Ring member, 6 ... Dust collector, 7 ... Vehicle, 8 ... Telescopic drive device, 9 ... First rail, 10 ... First 2 rails, 11: ring support member, 12: roller member, 21: short air tube, 22: split inner tube, 23: fastener member, K: face, T: tunnel.

Claims (5)

A telescopic wind tube having a flexible wind tube main body having flexibility and introducing air from one end of the wind tube main body through the wind tube main body,
A telescopic wind pipe, wherein a plurality of non-deformable inner pipes are arranged inside the wind pipe main body so as to be separated from each other in a direction in which the wind pipe main body expands and contracts. The telescopic air tube according to claim 1, wherein a plurality of shape retaining members for maintaining the shape of the opening of the air tube main body are attached to the telescopic air tube so as to be separated from each other in a direction in which the air tube main body expands and contracts. The telescopic air tube according to claim 1 or 2, wherein the plurality of inner tubes are arranged at equal intervals. The telescopic air tube according to any one of claims 1 to 3, wherein the inner tube is made of metal or resin. The wind tube main body is formed by connecting a plurality of short wind tubes,
At the end of the short wind pipe, a divided inner pipe forming the inner pipe is provided,
5. The air pipe according to claim 1, wherein the wind pipe main body and the inner pipe are formed by connecting the short wind pipes and connecting the inner pipes. 6. Telescopic wind tube.

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