JPH10331489A - Air-inflated membrane structural body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly carry out construction, dismantlement and conveyance by forming an air-room of a rib-shaped brace membrane connecting between an inside membrane of a membrane material having specific weight and gas permeability and an outside membrane and, at the same time, providing an opening in the brace membrane. SOLUTION: A membrane body applying coating machining of polyurethane, etc., thereto and having gas permeability less than 0.1 cc/sec. cm<2> at 30-200 g/m<2> of weight is formed in one side or both sides of a textile knitting of polyester fabrics. An outside membrane body of the membrane body and an inside membrane body 3 are connected with a rib-shaped brace membrane to form an air-room. Air is injected into the air-room with pressure to form an air membrane structural body, a ratio b/a between the installation frontage width (b) and opening frontage width (a) is 1.20-1.35, a ratio d/c between overall height (d) and effective height (c) is 1.10-1.35, and a ratio c/a between effective height (c) and opening frontage width (a) is 0.2-0.5. By the constitution, collapse due to snowfall or wind pressure can be prevented and, at the same time, construction, dismantlement and conveyance can be easily carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is intended to cover the entire work space such as a construction site for repair and painting of ships, a construction site, a temporary exhibition site, a ballpark, and the like so that work can be performed even during snowfall. The present invention relates to an air film structure which is lightweight and easy to set up.

[0002]

2. Description of the Related Art Conventionally, outdoor work is stopped when it is raining or snowing, and the work is continued after the rainfall or snowfall stops. However, such rainfall,
Large roof-like membrane structures have been proposed so that work can be performed efficiently without being affected by weather such as snowfall. For example, as a method of securing such a work space in the case of rain or snow, there is a structure in which a frame made of a pipe material is covered with a sheet. There is a problem that the labor required for setting up and dismantling becomes very large.

As a method for solving this problem, the present inventors have disclosed in Japanese Patent Application No. 7-332520 a roof-like shape by injecting air into an air film structure using a blower or the like.
An air film structure that achieves a light weight that secures a working space was proposed. However, although this air film structure can cope with rainfall, it can cope with a large amount of snow and strong winds, especially 10 m / s.
Buckling occurs when a strong wind exceeds the air pressure, the air film structure is crushed, and a working space cannot be secured.

As a method for preventing the deformation and buckling of the membrane structure due to an external load such as snow or wind, there is reinforcement by providing a base or the like with a lightweight steel frame.
It is necessary to provide a stand separately from the air film structure, and the air film structure cannot be easily installed. In addition, it is conceivable to increase the internal pressure of the membrane structure by a method other than reinforcement by providing a frame, etc., but in order to secure the internal pressure to withstand the use conditions in the required environment, a high-performance blower Is required. In addition, in order to form a film body that can withstand high internal pressure, it is necessary to increase the strength of the film body, which increases the weight of the film body itself, and causes a problem that handling properties such as transportation, installation, dismantling, etc. are deteriorated. Have.

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a lightweight air film structure which can be easily set up, dismantled, and transported and can withstand a large wind pressure. It is in.

[0006]

According to the present invention, there is provided (claim 1) a membrane material having a weight of 30 to 200 g / m ² and an air permeability of 0.1 cc / sec · cm ² or less. The inner film and the outer film form a double structure, an air chamber is formed by the rib-like hohoshoe film connecting the inner film and the outer film, and the rib-like hohoshoe film is provided with an opening through which air can flow. And a three-dimensional shape that covers the working space with the pressurized gas injected into the air chamber, and the following requirement A
A. An air film structure that simultaneously satisfies the conditions of The ratio b / a of the installation front width b to the opening front width a is 1.20.
~ 1.35, B. The ratio d / c of the total height d to the effective height c is 1.10 to 1.3.
5, C.I. The ratio c / a of the effective height c and the opening width a is 0.2 to 0.2.
0.5.

(2) The air film structure according to the above (1), wherein the reinforcing member is disposed integrally with the air film structure at an outer portion of the outer film and / or an inner portion of the inner film. The air film structure according to claim 1 or ² , wherein the reinforcing member is an air tube made of a film material, and the weight of the film material is 100 to 600 g / m2.
The air film structure according to any one of claims 1 to 3, wherein a check valve is provided at an opening of the rib-like Hohozue film connecting the inner film and the outer film and the inner film and the outer film. .

[0008] The air permeability referred to in the present invention is "JIS".
L1096 General textile test method "
m The amount of air passing through the fabric when measured with the water column pressure applied to the fabric.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention described above will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view, partially including a cross section, illustrating an air film structure of the present invention. In the figure, 1
Denotes a main body of the air film structure (hereinafter, referred to as “main body”);
Is an outer film body, 3 is an inner film body, and 4 is a rib-shaped hollow film, which forms an air chamber, and a roof-like three-dimensional shape is formed by air pressurized and injected into the air chamber. Note that the rib-shaped hollow film (4) is an inner film body (3).
And the outer membrane (4) are connected to form a double structure, and a circular opening (6) is provided so that air can flow through the entire air chamber. For this reason, when pressurized air is injected into the air chamber, the air film structure itself is formed in a predetermined roof-like three-dimensional shape, and can cover the work space. Also,
5 is an outer rib, 7 is an air supply / exhaust port, and a plurality of the air supply / exhaust ports (7) are attached from the viewpoint of quickly exhausting air in the main body when the main body (1) is folded. Is preferred, but the number depends on the shape, size,
It is appropriately determined according to the structure and the like.

Next, FIG. 2 is a front view in which a part of the air film structure shown in FIG. 1 is omitted. In the figure, reference numeral 8 denotes a blower.

The film used for the main body (1) is made of, for example, at least one fiber selected from the group consisting of polyester fiber, polyamide fiber, aramid fiber, carbon fiber, polyolefin fiber, and polyarylate fiber. One or both sides of a woven or knitted fabric coated with polyurethane, acrylic rubber, fluorine rubber, vinyl chloride resin or the like can be used. In this case, the air permeability of the membrane body is preferably in the 0.1cc / sec · cm ² or less, it is preferable to substantially 0cc / sec · cm ^2. Because the air permeability of the membrane is 0.1
If it exceeds cc / sec · cm ² , the pressure in the air chamber of the main body (1) decreases, and its shape retention is not preferable.

Next, it is necessary that the weight of each of the inner membrane and the outer membrane be 30 to 200 g / m ² .
Because, if the weight is within the above range, the weight of the membrane itself can be reduced, and the work requirement that the installation of the main body can be performed quickly and easily is satisfied,
This is because mechanical properties such as tear strength and tensile strength of the film body can be satisfied at the same time. That is, if the weight exceeds 200 g / m ² , the weight of the air film structure increases, and the work of setting up and dismantling is troublesome and takes time.
If it is less than g / m ² , the mechanical properties of the air film structure itself deteriorate, so that it is difficult to use the air film structure stably.

Here, as for the shape and dimensions of a practical air film structure, a shape as shown in FIG. 2 is required. Here, a indicates the installation frontage width, b indicates the opening frontage width, c indicates the total height, and d indicates the effective height, respectively. Here, as the range of dimensions to which the shape of the practical air film structure is applied, the ratio b / a of the installation front width b to the opening front width a is 1.20 to 1.
It is necessary to set in the range of 35. If b / a
Is less than 1.20, the main body easily buckles due to an external load. On the other hand, if it exceeds 1.35, the ratio of the effective area that can be used for work and the like to the installation area is significantly reduced. There is a problem that it is not the target.

Next, the ratio d / c of the total height d to the effective height c is:
It is necessary to set in the range of 1.10 to 1.35. Here, if d / c is less than 1.10.
An external load, particularly a load applied to the vicinity of the top of the main body due to snow or the like, easily causes buckling. If it exceeds 1.35, the membrane material to be used increases and the weight of the main body increases, resulting in poor handling. In addition, the large wind receiving area on the front of the main body makes it impossible to withstand a large wind pressure.

Further, the ratio of the effective height c to the opening width a is c /
a needs to be set in the range of 0.2 to 0.5. Here, when c / a is less than 0.2, not only the living space becomes small, but also the body shape comes closer to being parallel to the installation surface, so that snow is easily deposited on the body,
If it exceeds 0.5, the area where the wind pressure acting on the main body is positive (pressing) increases, and the wind load applied to the main body becomes large, so that buckling is likely to occur.

The cross section of the air chamber at the zenith (AA in FIG. 2)
The radius of curvature r _u of the cross section taken along the arrow, and the cross section of the air chamber at the center (L / 2 section) with respect to the circumferential length L from the installation surface of the outer membrane body (3) to the zenith (see the arrow BB in FIG. 2) the ratio r _u / r _m of the radius of curvature r _m of the cross section) is preferably set to 1.15 to 1.30. If it is less than r _u / r _m it is 1.15, depending on the distribution of wind pressure, commonly as the buckling behavior of the body due to wind load, the height position of the half with respect to the top portion from the installation surface A phenomenon may occur in which fine wrinkles occur (micro buckling), and when the wind load further increases, the bending increases and the whole collapses (macro buckling). For this reason, it is necessary to secure rigidity at a height position that is に 対 し て from the installation surface to the zenith. Since the r _u / r _m is to receive a large wind pressure since swept area of the body front increases exceeds 1.30, not much effect of improving rigidity even by increasing further.

By forming the air film structure of the present invention into the shape described above, when the internal pressure of the air chamber of the air film structure is 0.0037 kg / cm ² , the wind speed is 10 m / s to 10 m / s.
Even at 16 m / s, the shape can be maintained.

Here, as a blower (8) for sending pressurized air to the air chamber of the air film structure of the present invention, a blower or a fan can be suitably used. In this case, the capacity of the blower (8) can be larger than the amount of air leaking from the main body (1).
Any material can be used as long as it can generate a static pressure capable of maintaining the shape of the sheet. Further, the blower (8) can supply heated air from a hot-air blower or the like so that the snow can be effectively melted by conducting heat from the film material and discharging the heated air from the film material. Is also good.

Next, another embodiment of the present invention will be described in detail with reference to FIG. 3A and 3B show a front view and a side view, respectively.

In FIG. 3 (a), reference numeral 9 denotes an air tube which is disposed integrally with the main body (1) on the outer portion of the outer membrane and / or the inner portion of the inner film, and 10 denotes an air tube fixing device for fixing the air tube. Are respectively shown. Here, the air tube (9) forms an arch shape by supplying air from a compressor or the like (not shown), and the arch shape can be arbitrarily designed depending on the shape of the main body. It is not limited. The number of the air tubes (9) can be appropriately selected depending on the wind conditions and the like, and the air tubes (9) are used by being fixed integrally with the main body (1) by the air tube fixing device (10). The membrane used for the air tube (9) is, for example, a woven fabric composed of at least one fiber selected from the group consisting of polyester fiber, polyamide fiber, aramid fiber, carbon fiber, polyolefin fiber, and polyarylate fiber. One or both surfaces of the knitted material may be coated with polyurethane, acrylic rubber, fluorine rubber, vinyl chloride resin or the like. At this time, the air permeability of the membrane is substantially 0 cc / sec.
-It is preferable to set cm ² . Further, it is preferable that the weight of the film body of the air tube (9) is 100 to 600 g / m ² . When the weight exceeds 600 g / m ² , the rigidity of the membrane increases, and the membrane becomes bulky when stored. On the other hand, when the weight is less than 100 g / m ² , the mechanical properties of the air tube itself deteriorate. Difficult to use stably.

Another embodiment as reinforcement by the reinforcement member will be described in more detail with reference to FIG. FIG.
(A) is a front view of the air film structure equipped with the reinforcing member. In the figure, reference numeral 11 denotes a reinforcing member. As the reinforcing member (11), a metal or resin rod or pipe can be used, and several reinforcing members may be joined to form a single reinforcing member.

However, the weight of the reinforcing member is 1
Since the reinforcing member is constituted by an air tube using a membrane material of 00 to 600 g / m ² , the elasticity of the reinforcing member allows the reinforcing member to be arranged along the shape of the membrane on the living space side of the inner membrane of the main body. The main body (1) receives the repulsive force of the reinforcing member to return to the linear state, and the main body (1) is always in a state of being lifted, and the rigidity is increased.

Next, FIG. 4B shows a cross-sectional view taken along the line CC of FIG. 4A, and 12 shows a reinforcing member fixture. Here, when fixing the reinforcing member (11) to the main body (1), if the reinforcing member (11) is arranged in a recessed portion between the air chambers as shown in the drawing, the displacement of the reinforcing member (11) is less likely to occur. In addition, the reinforcing member fixing device (12) can be easily detachable by using a magic tape or the like.

FIG. 5 is an explanatory view for explaining the operation of the check valve provided at the opening of the rib-like Hohozue film connecting the inner film and the outer film. FIG. 5 (a) is a front view, and FIG. b) is a cross-sectional view taken along the line DD in FIG.

In FIG. 5A, reference numeral 13 denotes a check valve, and the check valve (13) is provided at an opening of the rib-shaped hohozue film (4). Also, in FIG.
Denotes a fixing plate, 15 denotes a rubber sheet, and 16 denotes a set screw. The rubber sheet (15) is fixed to the fixed plate (14) by a set screw (16), thereby reducing the weight and cost. Has been

Next, the operation of the check valve provided as described above will be described with reference to FIG. FIG.
(A) and (b) are partial enlarged views of FIG. 1 (a), in which the direction of air flow is indicated by arrows.

As shown in the figure, the check valve (13) is provided at the opening of the rib-shaped hohozue film 4. Here, the check valve (13) has an internal pressure of the air chamber (17).
If the internal pressure is lower than 8), the rubber sheet (15) is deformed to allow air to flow into the air chamber (17), and the internal pressure of the air chamber (17) is higher than the internal pressure of the air chamber (18). In this case, the rubber sheet (15) closes the opening of the fixing plate (14) and plays a role of preventing the air from flowing out of the reinforcing air chamber (14). Generally, when the main body (1) is rapidly deformed, the internal pressure of the main body (1) rises sharply, and as a result, air flows out from the main body (1) to the atmosphere via a blower or a film material. For this reason,
By providing the check valve (13), it is possible to prevent leakage of the amount of air (reduction of air pressure) in the main body (1), thereby preventing buckling of the main body (1). . In the present invention, the check valve (13) is easily opened when air is sent from the blower to the air chamber of the main body (1) so that the main body (1) can form a predetermined three-dimensional shape. Needless to say, it is provided at the positive side so as to take the flow direction of the air.

[0028]

As described above, according to the present invention,
Not only during rainfall, but also during snowfall or strong wind, the air film structure does not collapse due to snow and wind pressure.Since its structure is simple and lightweight, it is easy to set up, dismantle, transport, etc. The air membrane structure can be provided with a particularly remarkable effect.

[Brief description of the drawings]

FIG. 1 is a perspective view including a cross section of a part illustrating a conventional air film structure.

FIG. 2 is a front view schematically showing a part of the air film structure shown in FIG.

FIG. 3A is a front view illustrating an embodiment of the present invention. (B) is a side view which illustrated the embodiment of the present invention.

FIG. 4A is a front view of an air film structure provided with a reinforcing member. (B) shows the CC sectional view.

FIG. 5 (a) is a front view partially showing a cross section showing another embodiment of the present invention. (B) shows a front view of the check valve.

FIG. 6 is a cross-sectional view taken along the line DD in FIG. 5A for explaining the operation of the check valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air film structure main body 2 Outer film body 3 Inner film body 4 Rib-like membrane 6 Opening 7 Air supply / exhaust port 8 Blower 9 Air tube 10 Air tube fixing tool 11 Reinforcement member 12 Reinforcement member fixing tool 13 Check valve 14 Fixing plate 15 Rubber sheet 16 Set screw

 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Keibo Sekiya 1-6-7 Minamihonmachi, Chuo-ku, Osaka-shi, Osaka Teijin Limited

Claims (4)

[Claims] 1. A double structure comprising an inner membrane and an outer membrane using a membrane material having a weight of 30 to 200 g / m ² and a permeability of 0.1 cc / sec · cm ² or less, wherein the inner membrane and the outer membrane are used. An air chamber is formed by a rib-like hohoshoe film connecting the membranes, and the rib-like hohoshoe film has an opening through which air can flow, and the working space is covered by pressurized gas injected into the air chamber. An air film structure having a three-dimensional shape and simultaneously satisfying the following requirements A to C. A. The ratio b / a of the installation front width b to the opening front width a is 1.20.
~ 1.35, B. The ratio d / c of the total height d to the effective height c is 1.10 to 1.3.
5, C.I. The ratio c / a of the effective height c and the opening width a is 0.2 to 0.2.
0.5. 2. The air film structure according to claim 1, wherein a reinforcing member is disposed integrally with the air film structure at an outer portion of the outer film and / or an inner portion of the inner film. 3. The reinforcing member is an air tube made of a film material, and the weight of the film material is 100 to 600 g /
The air film structure according to claim 1, wherein m ² is m ² . 4. The air film structure according to claim 1, wherein a check valve is provided at an opening of the inner film and the outer film and an opening of the rib-shaped hohozue film connecting the inner film and the outer film. body.