JPH08271029A - Tool for preventing air leakage of air duct - Google Patents

Abstract

PURPOSE: To provide an air leakage preventing range by covering a connecting part from the outside by an easily removable air leakage preventing tool to prevent the air leakage from the connecting part of an air duct accompanied by the rise of the pressure of a blower. CONSTITUTION: An air leakage preventing tool 11 composed of a highly water absorbing fiber sheet 12 attached to the inner circumference of a cylinder which is obtained by joining the adjacent surfaces of a sheet 12 made of a material which is impermeable, and rich in flexibility and elasticity, and reinforcing bodies 16, 18 made of a material which is impermeable, rich in flexibility, small in elongation, and strong, is closely attached to the periphery of connecting parts 3, 4 of air ducts 1, 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a site where a work site needs ventilation, such as a tunnel construction work, where a blower or the like discharges polluted air from inside the tunnel to the outside or supplies fresh air from outside the tunnel In this case, the present invention relates to a wind-leakage preventive tool for minimizing the amount of air leaking from the connection point of the wind conduit due to the internal air pressure of the wind conduit used for efficiently supplying and removing the air.

[0002]

2. Description of the Related Art Underground works such as tunnels and works carried out in buildings with few openings require natural ventilation only for workers working inside and machines used, and gas generated from the site. Is insufficient to meet both of the air volumes required for the removal of Usually, an air duct is connected from an entrance opening such as a tunnel to a necessary place inside, and a blower is connected to any tip of the air duct to supply fresh air or discharge contaminated air.

In the construction of a tunnel, as the distance from the entrance to the internal destination becomes longer, the wind pipes of unit length are successively added to extend the entire length, so it is not uncommon for long ones to exceed 1,000 meters. On the other hand, since the diameter of the wind conduit reaches several tens of centimeters to several meters, the weight of the wind conduit is reduced, the assembling and dismantling is easy, and the space for storage is reduced.
Various inventions and devices for preventing air leakage from connecting points, cost, etc., for example, in addition to Utility Model Nos. 2-129500 and 4-65900, Utility Model Registration No. 200
There is a device such as 9081. The previous two cases are prior applications of the applicant.

In Japanese Utility Model Laid-Open No. 129500/1990, fasteners are attached at three positions on the longitudinal direction of the air duct and the surface connecting the air ducts to each other to facilitate the assembly and disassembly of the air duct, and further to unfasten the fastener. With the technology that can be folded as a single sheet with the purpose of saving space when storing it, in the actual Kaihei 4-65900, one end is fixed to the circumferential surface slightly inside the connection part of the wind conduit and the other end is free. As a technology for improving the leakage of air from the connection point of the wind conduit by providing each of the cylindrical air leakage prevention tools that flow along the flow direction of the air, in the utility model registration No. 2009081, there is Disclosed is a technique for improving the leakage of air by dividing the axial force of the air duct applied to the fastener into two parts by providing the fasteners to be used inside and outside, respectively. .

[0005]

The unit length of the wind conduit is usually about 10 meters. Therefore, if the air ducts are replenished and the laying distance is lengthened, the number of connection points is also increased. When the laying distance becomes long, the air resistance also increases, and it is necessary to increase the diameter of the air duct or increase the blowing pressure of the blower in order to send a constant amount of air. Increasing the diameter of the air duct reduces the effective space at the work site and raises the price of the air duct itself, making it less convenient at the site. Therefore, a diameter of about 1.5 m is often used.

On the other hand, when the air pressure of the blower is increased, it is natural that air leakage starts even from a connection point where there is no concern in a usage state where the air pressure is low. Even if the amount of air leakage per connection point is small, if the number of connection points is large, it will be a non-negligible amount. In order to supplement the amount of air leakage and maintain the amount of air blown, it is necessary to increase the pressure of the blower, but this increases the power cost, that is, the electricity bill, which cannot be ignored.

[0007] When the length, material, structure, and ventilation air volume of the air duct are constant, comparing the case where the measures for preventing air leakage at the connection point of the air duct are sufficient and the case where they are insufficient, the former has the same diameter.・ The air flow rate is large with the same length and pressure, and the air pressure can be reduced with the same diameter, length and air volume. It is a well-known property of air that if the diameter of the air duct is increased, it becomes possible to maintain the same air volume under the same air pressure and to extend the entire length of the air duct.

In the skirt-like air leakage preventive device attached to the connecting portion of the air duct disclosed in Japanese Utility Model Laid-Open No. 4-65900, the air pressure is increased and the adhesion between the inner surface of the air duct and the skirt is increased. However, it is not sufficient to prevent air leakage, and it cannot be said that the above-mentioned air duct having a structure in which two fastener connecting points are provided. It is an object of the present invention to provide an air leakage prevention tool for constructing an air leakage prevention region at the air duct connection portion in order to solve the above problems.

[0009]

SUMMARY OF THE INVENTION According to the device for preventing air leakage of the present invention, a force acting in the axial direction of a wind conduit is received by a fastener at a connection point, and the air leakage generated at the connection point is suppressed by another means. To do. Therefore, the air leak prevention tool need only have a structure corresponding to the internal gas pressure, and the air leak prevention tool has an extremely lightweight and simple structure. In addition, since the structure is such that assembly and dismantling work at the site is easy, any of the parties can deal with it at any time during the site such as a tunnel construction.

When pressurized air is passed through a wind duct having a connecting portion, the wind duct expands and extends. Although it depends on the internal pressure, there is a case where the air duct with a diameter of 1400 mm before ventilation has a diameter of 1450 mm after ventilation, and it may be considered that it expands by 1 to 5% with respect to the diameter before use. However, since the connecting portion uses the fastener, the expansion in the circumferential direction is restricted, and the bulge thereof is almost equal to the bulge of the air duct. Therefore, the most important thing to consider when providing the air leakage prevention area at the connection point is the countermeasure against the step due to the difference in the bulge at the air duct connection point as described above. In the present invention, effective prevention of air leakage cannot be provided, and the present invention has been made in consideration of this point.

The basic structure of the device for preventing air leakage is a square shape made of a non-breathable, highly flexible and elastic material that can sufficiently cover the periphery of the air duct of the target diameter including the connection points. A sheet, a non-breathable, flexible and strong material with low elongation attached to both ends which are two sides perpendicular to the axial direction of the wind conduit of the sheet covered in order to closely adhere to the periphery of the wind conduit. A reinforcing band, a sheet made of highly water-absorbent fiber attached to the inner surface of the sheet, the sheet parallel to the axial direction of the air duct, and joining means for joining both ends of the reinforcing band in a tubular shape.

Since the sheet with the reinforcing belt is required to be attached to the outer circumference of the wind duct and then to bulge itself in accordance with the bulge of the wind duct, the sheet is rich in flexibility and elasticity and can be bonded by heat or an adhesive. A material that can be used is selected. It is suitable to use natural or synthetic rubber products, synthetic resin products, or synthetic products from the above products and cloth-like products, preferably ethylene vinyl acetate (EVA) (Table 1).
See) or equivalent. The material of the reinforcing band is
The EVA (see Table 1) containing a reinforcing material that maintains flexibility and has low elasticity and increased strength, an equivalent product, or the same material as the air duct may be used.

In order to fix the sheet with the reinforcing band to the outer circumference of the wind duct, the inner peripheral length of the reinforcing band is made equal to or slightly shorter than the outer circumference of the wind conduit, and the two sides parallel to the axial direction of the wind conduit are used. Bond both ends together and finish into a cylinder. It is preferable that the reduction ratio is set such that the sheet has the same length to 5% and the reinforcing band has the same length to 2% as compared with the outer circumferential length of the air duct in the circumferential direction before swelling. Adhesion between both ends of each of the two sides is abutting and further reinforced from the front side, or at least one of the adhering portions between the ends of the two sides is processed into a wedge shape and overlapped, or the sheets are overlapped and pressure-bonded. Alternatively, they may be adhesively processed with heat or an adhesive, respectively. In any case, it is important to form the inner surface of the tubular portion so that no step is formed in the bonded portion.

[0014]

[Table 1]

When the internal pressure of the wind duct is not high, the sheet with a reinforcing strip is not formed into an endless tubular shape, but a surface fastener is attached to the ends of the sheet with a reinforcing strip on two sides parallel to the axial direction of the wind duct. Although it may be formed into a tubular shape by attaching and mounting the sheet around the wind conduit outer peripheral surface and closing it, it is effective to wind the sheet with the reinforcing belt measured and placed shorter than the outer periphery of the wind conduit while stretching. . This amount of extension is [0
[014]]. Even with such a method, since the holding force of the surface fastener is sufficient, the air leakage prevention tool does not move freely during use.

Depending on the use conditions of the wind conduit, the means for fixing the air leakage prevention tool is a free supporting means for fixing the inner pressure when the air conduit expands by air pressure and the friction between the gaps. Means of fixing directly by sewing or adhesive along the circumference of the conduit in the circumferential direction and making the other reinforcing band a free end-With surface fasteners provided at least at two or more locations on the outer circumference of the wind conduit corresponding to the sheet with the reinforcing band It may be selected from the means for detachably fixing the tongue-shaped temporary fixing material.

The air leaked from the fastener at the air duct connecting portion is accumulated between the air duct and the leakage preventive tool, but the air duct outer periphery and the sheet reinforcing band, and the air duct outer periphery and the sheet are in close contact with each other. To prevent the leakage of air to the outside. Furthermore, the highly water-absorbent fiber sheet attached to the inside of the sheet works so as to cover and suppress the entire connection portion of the air duct, and further enhances the prevention of air leakage. In addition, the water absorbent of the air is adsorbed and the superabsorbent fiber sheet swells and is clogged, so that the air leakage prevention effect is enhanced.

In the ring-shaped sealing material which is another mode for preventing the leakage of the connection portion of the wind conduit, the wind conduit swells and a step is generated between the outside diameter of the wind conduit and the connection portion as described above. Sometimes effective. Generally, a synthetic resin product containing a reinforcing material is used as a material forming the air duct, so that the air conduit is easily stretched as compared with the connecting portion. In such a case, air leakage is prevented by sticking a ring-shaped sealing material made of highly water-absorbent fiber to the inside of the seat at least at one position in the circumferential direction on the left and right in the axial direction from the center of the connection point. The effect is enhanced.

The sealing material for preventing leakage at the connecting portion of the air duct according to the present invention may be the following material or an equivalent product, but preferably a fibrous material made of sodium polyacrylate as a raw material is preferable. Depends on the final form of the fibrous material, but the mixing ratio is 50% and the water absorption is 200-450 of its own weight.
%, High (water retention) due to clogging between fibers,
The absorbed water does not easily escape from the fiber material even if it is pressurized by gelling with the fiber, and conditions such as enduring repeated operations of drying and water absorption facilitate the practice of the present invention.

Still another aspect of preventing leakage at the connection portion of the wind conduit is to install at least three or more sheets, which are one of the basic constitutions of the device for preventing air leakage of the present invention, in the same direction as the connection surface of the wind conduit. When cut into a plurality of sheets, and when each is bonded by heat or an adhesive, if the length is shortened inward from the outside, the contraction of the sheet when wound around the connection point of the air duct It becomes stronger toward the inside, and in response to the step formed between the air duct and the connection point due to the air swelling of the air duct, it is possible to reduce the gap and enhance the adhesion effect.

The air leaks from the fasteners, which are the connection points of the wind conduits, but the amount of air leakage increases as the pressure of the air increases, so that it is closer to the blower and less away from the blower. Instead, it only needs to be attached to the problem area in a limited area near the blower. Moreover, even if the pressure of the air for the purpose of sending and exhausting air for general construction is high, it is 500
It is about mm mm water column, and the withstand pressure required for the device for preventing air leakage according to the present invention does not need to exceed this. On the other hand, if the wind conduit is extended as the construction progresses, it will be necessary to install additional measures for air leakage, so it is desirable that all site workers can easily handle the air leakage prevention device. Preventive devices meet this need.

[0022]

The air leaking from the connecting portion of the air duct due to the pressure held by the air flowing in the air duct has the flexibility and elasticity of the sheet with the reinforcing belt which is the main constituent element of the air leakage prevention device according to the present invention. And the strength of the air duct close contact with the outer peripheral surface of the air duct, and in addition to the effect of blocking the air loss passage, the superabsorbent fiber sheet directly suppresses the connection point or seals the step portion, and absorbs the water of the superabsorbent fiber sheet. Swelling due to swelling further increases.

In the following, a detailed description of the functions of parts and parts having the same shape (including the same or similar) in the respective drawings will be made according to the preceding sentence to avoid duplication as much as possible, and a brief description will be given when necessary. stopped.

[0024]

Embodiment 1 FIG. 1 shows a state of a connecting portion of a conventional wind conduit. The wind duct 1 on the left side and the wind duct 2 on the right side are connected by fastener portions 3 and 4 provided at respective tips. The air leak preventive tool 5 is bonded to the leeward side of the wind conduit 1, and one end of the air leak preventive tool 6 is adhered to the upwind side of the wind conduit 2, and the other ends are not fixed so as to flutter along the air flow. . The positional relationship is such that when air flows in the direction indicated by the arrow, the air leak preventive device 5 overlaps the inside of the air leak preventive device 6 to cover the connecting portion 3.4 to which the fastener is attached, and serves to prevent air leakage. The reinforcement bands 7 and 8 with eyelet are for suspending and placing the wind conduit. The air leak prevention tools 5 and 6 may be omitted depending on the state of the air duct (not shown).

FIG. 2 shows a state in which the device for preventing air leakage according to the present invention is attached to the connection points 3 and 4 of the conventional air ducts 1 and 2. The air leak prevention tool 11 according to the present invention is basically a cylindrical sheet 12, a super absorbent fiber sheet 15 attached to the inner surface, and a reinforcing band 1 attached to both ends of the sheet 12.
6 and 18. FIG. 3 is a perspective view of the air leak prevention tool 11 of FIG. 2, and FIGS. 4a and 4b are enlarged cross-sectional views of the joint portion of FIG. When the air leakage prevention tool 11 is attached to the outer surface of the air duct, the air leakage prevention tool 1 is connected before connecting the air ducts 1 and 2 in advance.
1 is inserted into one of the air ducts 1 and 2, and after the connection, the superabsorbent fiber sheet 15 is slid and positioned so as to cover the connection portion 3.4.

If the diameter of the air duct becomes large, it will take time and effort for mounting and positioning. Therefore, the reinforcing band 1 of the seat 12 is previously prepared.
One of the parts 6 and 18 is fixed to the corresponding outer peripheral surface of the wind conduit by sewing or an adhesive to save the positioning work, or between both the reinforcing bands 16 and 18 and the outer peripheral surface of the wind conduit.
As described above, the surface fastener 19a fixed to the outer peripheral surface of the wind conduit and the surface fastener 19b at the tip of the tongue-shaped small piece attached to the surfaces of the reinforcing belts 16 and 18 are joined and temporarily fixed to save the labor of positioning and to be removable. Good. As the material of the sheet 12, a synthetic resin product EVA (see Table 1) having flexibility and moderate elasticity, which can be heat-bonded, is used, so that the sheet 12 has good adhesion and deformation such as bulging of the outer surface of the wind conduits 1 and 2. Follow. The material may also be a rubber product.

When fixing the seat 12 and the reinforcing bands 16 and 18, the length of the sides 12a and 12b of the sheet 12 and the reinforcing band 1 are fixed.
The lengths of 6, 18 are shorter than the outer circumferential lengths of the wind conduits 1, 2 in the former by the same length to 5%, and the latter is selected by the same length by 2%. Forming by adhering with heat or an adhesive according to the length of 18 has the effect of further enhancing the adhesion between the sheet 12 and the air ducts 1, 2. On the other hand, the material of the reinforcing belts 16 and 17 may be the same as that of the air duct, but the surface in contact with the outer sheet 12 needs to be capable of being bonded by heat or an adhesive. The reason is that when a highly elastic material is sewn, it often tears along the sewing surface.

The air leakage prevention tool 11 mounted on the outer surfaces of the air ducts 1 and 2 in this manner adheres to the outer surfaces according to the bulge of the air ducts 1 and 2, and is flexible with respect to the connection points 3 and 4. A thick highly water-absorbent fiber sheet 15 made of a material having a high water-absorption property covers the bonding points 3 and 4 so as to wrap the periphery.
The air passing through the air duct often has a damp air, and the highly water-absorbent fiber sheet 15 absorbs and swells moisture in the air with the passage of time to cause clogging, thereby enhancing the sealing effect.

[0029]

[Embodiment 2] FIG. 6 shows a state in which the air ducts 1 and 2 and the connection points 3 and 4 have different material configurations, and therefore, a slight difference occurs in the outer diameter bulged by the air pressure during ventilation. There is. Therefore, when the step is large, rather than directly suppressing the connection points 3 and 4 as in the air leak prevention tool 11 of FIG.
When the ring-shaped superabsorbent fiber sheets 25a and 25b are attached to the outside of the connection portions 3 and 4 like the air leak prevention tool 21 of FIG. 6, good results of suppressing leakage in the axial direction of the air duct can be obtained. This ring-shaped super absorbent fiber sheet 25a, 25b
When either one of the reinforcing bands 16 and 18 is irremovably fixed to the corresponding wind conduit, it may or may not be installed on the fixed side.

[0030]

[Third Embodiment] FIG. 7 shows an air leakage prevention tool 31 which is another means for dealing with the step of the outer diameter shown in the second embodiment. The seat is divided into three in the circumferential direction, and the central seat 3
2. The right and left sheets 33 and 34 are adhered to each other by heat or an adhesive in this order, and the outer sides of the left and right sheets 33 and 34 are adhered to the reinforcing bands 16 and 18. When bonding each other, the central sheet 32 has the same length to 5% shorter and the divided sheets 33 and 34 have the same length to 2% shorter than the outer circumferential length in the circumferential direction of the air duct before expansion. Select from each range, align both ends, and then bond and bond together. Naturally, the shortening rate of the central sheet 32 is set to exceed the shortening rate of the left and right sheets 33 and 34.

The super absorbent fiber sheet 35 in this embodiment is
It is attached to the inside of the divided sheet 32. Connection point 3,
4 is inserted into the outer peripheral surfaces of the air ducts 1 and 2 after ventilation, and the sheets 32, 33,
The outer diameter of the cylindrical portion formed by the sheets 33, 32, and 34 is smallest in the outer sheet 32 portion, and the outer portion is in close contact with the outer peripheral surface of the wind conduits 1 and 34, so that high water absorption is achieved. The elastic fiber sheet 35 suppresses the connection points 3 and 4, and obtains the same effect as that of the first embodiment. The super absorbent fiber sheet may have a ring shape.

[0032]

[Embodiment 4] FIG. 8 shows a wind leakage preventing tool 41 of the type wound around the outer peripheral surfaces of the air ducts 1 and 2, with a seat 42 and a reinforcing band 46,
A tongue-like sheet 43 is attached to the front of one end of the air duct 48 in the circumferential direction. The tongue-shaped sheet 43 may itself be a surface fastener. FIG. 9 shows a cross section of the central portion of the tongue-shaped sheet 43. A tongue-shaped sheet 43 is bonded to the sheet end 42d inside by heat or an adhesive, a surface fastener 44d is attached to the leading end thereof, and a surface fastener 44c is directly attached to the other side 42c. Seat 42 to wind ducts 1, 2
After being wound around the outer peripheral surface, the sheet end 42c is inserted so as to be sandwiched below the other end 42d, and both are joined by a surface fastener to form a tubular shape. The position of the super absorbent fiber sheet is the same as that of the other examples except that it is not endless.

[0033]

The following effects were obtained by the device for preventing air leakage of the present invention (see Table 2 and FIG. 2). The amount of air leaks from the wind conduit was reduced. Since the air leakage prevention tool has a structure corresponding only to the internal pressure of air, the air leakage prevention tool has a lightweight and simple structure. No special tools or materials were required for on-site installation, and only the construction site personnel could handle this without problems. The air leakage prevention tool formed on the outside of the air duct did not overhang the surrounding work space because the protrusion from the outer surface of the air duct was minute. When air leak prevention measures were required at the connection points of the air duct, it was possible to deal with this by selecting the attachment method in advance.

[0034]

[Table 2]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a conventional air duct equipped with a device for preventing air leakage.

FIG. 2 is a cross-sectional view in which the air leakage prevention tool of the first embodiment according to the present invention is attached to a wind conduit.

FIG. 3 is a perspective view of a device for preventing air leakage according to the first embodiment.

FIG. 4 is an enlarged cross-sectional view of an adhering portion of the air leakage prevention tool at the portions indicated by arrows a and b in FIG.

FIG. 5 is a perspective view of a temporary fixing means for a reinforcement band of a device for preventing air leakage.

[Fig. 6] Fig. 6 is a cross-sectional view in which the air leakage prevention tool of the second embodiment according to the present invention is attached to an air duct.

[Fig. 7] Fig. 7 is a cross-sectional view in which the air leakage prevention tool of Embodiment 3 according to the present invention is attached to an air duct.

FIG. 8 is a perspective view of a device for preventing air leakage according to a fourth embodiment of the present invention.

9 is an enlarged cross-sectional view of a circumferential connection portion arrow c of the air leakage prevention tool of FIG.

FIG. 10 is a schematic diagram of a method for testing a device for preventing air leakage according to the present invention.

[Explanation of symbols]

1, 2 Wind pipe 3, 4 Connection part 11, 21, 31, 41 Wind leakage prevention device 12, 32, 33, 34, 42 sheet 15, 25a, 25b, 35, 45 Super absorbent fiber sheet 16, 18, 46, 48 reinforcement belt

Claims (11)

[Claims] 1. The wind conduit (1, 2) with respect to the circumferential length in the circumferential direction,
A sheet made of non-breathable, highly flexible and elastic material (12,
32,33,34,42) is shortened by the same length to 5%, and the length of the reinforcement band (16.18) made of a material with high air permeability, flexibility and low elongation is the same length to 2%. % Shortened and selected from each range, each adjacent part is stretched according to the length of the reinforcing band (16.18), at least partly overlapped and bonded to form a tubular air leak prevention device (11, 21, 41) To cover the outer peripheral surface of the wind conduit,
A device for preventing leakage of wind conduits, characterized in that a leakage prevention region is provided around the connection points (3, 4) of the wind conduits (1, 2). 2. The wind conduit (1,2) with respect to the circumferential length in the circumferential direction,
In the central sheet (32), the circumferential length of at least three or more divided sheets (32, 33, 34) made of non-breathable, highly flexible and elastic material has been shortened by the same length to 5%. , Left and right seats (33,34) shortened by the same length to 2%
(32) is always the same compared to the shortening rate of the left and right seats (33, 34)
The length of the reinforcement band (16.18) made of a material that is equal to or more than the same, is non-breathable, has flexibility, and has little elongation.
Reduce the length by 2% and select from each range. Extend the length between adjacent sides to the same length according to the length of the reinforcing band (16.18), and at least partially overlap the bonded sheet with the reinforcing band into a tubular shape. Cover the outer peripheral surface of the wind conduit with the air leak prevention tool (31)
A device for preventing leakage of wind conduits, characterized in that a leakage prevention region is provided around connection points (3, 4) of the wind conduits (1, 2). 3. Seat (12,32,33,34) and reinforcement band (16.18)
The seat edge (12c, 12d, 16) parallel to the axial direction of the wind duct (1, 2).
c, 16d) and the reinforcing strips (16, 18) are abutted, and the abutting upper surface is affixed with a reinforcing material (13, 17) and bonded, and the wind preventive tool (11, 21, 31) in the form of a tube is used. Where to connect conduits (1, 2)
An air leak prevention tool for a wind conduit according to any one of claims 1 and 2, characterized in that an air leak prevention region is provided around (3, 4). 4. Seat (12,32,33,34) and reinforcement band (16.18)
The seat edge (12c, 12d, 16) parallel to the axial direction of the wind duct (1, 2).
c, 16d) and a part of the reinforcing band (16, 18) are overlapped and joined, and the air ducts are adhered so that no step is formed inside the joined part, and they are formed into a tubular shape by the air leakage prevention tool (11, 21, 31). (1,2) connection point
The air leak prevention tool for a wind duct according to any one of claims 1 to 2, wherein an air leak prevention region is provided around (3, 4). 5. A sheet end (4) which is parallel to the axial direction of the wind duct (1,2) when the sheet with a reinforcing band is wound around the outer peripheral surface of the wind duct (1,2).
2c, 42d) Provide a tongue-shaped sheet (43) with a bonding material (44d) at the tip, and insert the end (42d) into the back side of the other end (42c) so that it corresponds to the bonding material (44c). By the air leakage prevention tool (41) that is joined to the joining material (44d) provided in front of the other end (42d) and has a cylindrical shape, the air leakage around the connection points (3, 4) of the air ducts (1, 2). 3. A device for preventing air leakage of a wind conduit according to any one of 1 to 2, which is provided with a prevention region. 6. A device for preventing leakage of air (11, 21, 31, 41) is inserted without being fixed to either side of the outer peripheral surface of the air duct (1, 2) before connection, and the connection portion is completed after the connection work is completed. Slide the air leakage prevention tool to the center of (3,4) to connect the air ducts (1,2) (3,4).
An air leakage prevention device for a wind conduit according to any one of claims 1 to 5, wherein an air leakage prevention region is provided around the. 7. A reinforcing band (1) corresponding to the outer peripheral surface of the wind conduit (1, 2)
(6,18) One of them is fixed irremovably by sewing or gluing, and when the connection of the air ducts (1, 2) is extended, the reinforcing strip on the non-fixed side is slid to the fixed side and the connection work is possible. , A device for preventing air leakage that returns to the original position after completion of connection work (11, 2
The wind duct according to any one of claims 1 to 5, characterized in that a wind-leakage-preventing region is provided around the connection point (3,4) of the wind duct (1,2) by (1,31,41). A tool for preventing wind leakage. 8. A reinforcing band (1) corresponding to the outer peripheral surface of the wind duct (1, 2)
(6, 18) A removable tongue-shaped temporary fixing means is provided to prevent the leakage of air from the outer peripheral surface of the air duct (1, 2).
By (11,21,31,41), the connection points (3,4) of the wind conduits (1,2)
An air leakage prevention device for a wind conduit according to any one of claims 1 to 5, characterized in that an air leakage prevention region is provided around the area. 9. A highly water-absorbent fiber sheet (15, 25a, 25b, 35, 45) made of a material that is flexible and swells due to water absorption and becomes clogged on the inner surface of the central portion in the axial direction of the tubular sheet with a reinforcing band. 9. A device for preventing leakage of air (11, 21, 31, 41) attached to provide a leakage prevention region around the connecting portion (3, 4) of the air duct (1, 2). A device for preventing air leakage of a wind conduit described in any one of above. 10. A flexible material swelled and swelled by absorption of water attached to the inside of a sheet with a reinforcing band is provided at a step portion between a wind conduit (1, 2) and a connecting end portion (3, 4) which can be formed during ventilation. In order to fill up, at the position in the left-right direction from the center of the connection end (3, 4), at least one place with a ring-shaped seal (25a, 25b) with a leak prevention tool (11, 21, 31, 41). The device for preventing leakage of wind ducts according to any one of claims 1 to 8, characterized in that a leakage prevention region is provided around the connection points (3, 4) of the wind pipes (1, 2). 11. A super absorbent fiber sheet attached to the inside of a sheet with a reinforcing band used for a device for preventing air leakage (11, 21, 31, 41) is made of a sodium polyacrylate salt. The device for preventing air leakage of an air duct according to any one of claims 1 to 10.