JPH10219661A - High strength rubberized fabric for flexible film-made undulating weir - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin and lightweight high strength rubberized fabric for a flexible undulating weir by using a woven fabric by basket weaving aramid fiber, on which fineness of raw yarn, tensile strengths in a longitudinal and lateral direction and the weft number/the wap number fall within a prescribed range. SOLUTION: Raw yarn of aramid fiber on which fineness is not less than 3000 denier is woven in a basket shape, and high strength woven fabric 3 on which tensile strength in the warp direction is not less than 800kgf/cm and tensile strength in the weft direction is not less then 2/3 of that in the warp direction and the weft number/the warp number fall within the range of 0.5 to 0.8, is manufactured. The fineness of the weft to constitute the woven fabric 3 is preferable to be smaller than the warp. Both surfaces of this woven fabric 3 are coated with synthetic rubber 5 to form high strength rubberized fabric 1. A film material obtained by laminating the high strength rubberized fabric 1 in two layers, is thin and lightweight, and is superior in either point of thinness, flexibility, strong fatigue resistance for bending, reliability of a laminated surface, transport performance and workability to a conventional nylon fiber-made material as a film material for a flexible film undulating weir having a weir height 6, which requires a warp directional strength not less than 1600kgf/cm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-strength rubberized cloth used as a covering material for a flexible membrane undulating weir.

[0002]

2. Description of the Related Art An up-and-down weir made of a flexible membrane (hereinafter referred to as a rubber weir) is provided with a flexible membrane wrap 9 attached in a direction crossing the flow of a river as shown in FIG. By forming a weir body and supplying and discharging a fluid such as air or water into the weir body, the weir body expands and stands and contracts. 8 is a substructure and 10 is a rubber weir.

A flexible film (hereinafter referred to as a film material) forming the above-mentioned envelope is usually made of at least one layer of a rubberized cloth made of a woven cloth of an organic fiber such as nylon or polyester coated with rubber. A laminated material is used, and nylon is particularly common as the material of the organic fiber.

In general, the tensile strength (hereinafter, simply referred to as “strength”, which indicates the strength in the warp direction unless otherwise specified) required for the film material varies depending on the height of the rubber weir, and the higher the weir height, the higher the strength. Is required. The general height of the rubber weir is 3 m or less, the required strength of which is about 400 kgf / cm. Normally, two layers of rubberized cloth using a woven cloth having a strength of 200 kgf / cm are laminated and bonded and used. However, in the case of a rubber weir having a weir height exceeding 3 m, which is increasing in recent years, for example, a film material for a rubber weir having a weir height of 6 m requires a strength of about 1600 kgf / cm. That is, when a conventional woven fabric is used, eight layers of the rubberized fabric must be laminated. For this reason, the rigidity of the film material is increased, the flexibility is reduced, the bending fatigue resistance is significantly reduced, and the film material is thick and heavy, which makes transport and construction difficult. In addition, since the number of laminations increases significantly, the bonding area increases significantly, resulting in poor reliability.
The increase in man-hours is also disadvantageous in terms of economy.

Conventionally, in order to solve the above problems, an attempt has been made to reduce the number of laminated rubber-coated cloths by applying a rubber-coated cloth using a higher-strength woven cloth made of nylon fiber to the film material. (For example, JP-A-56-64860). But,
Even with these improved woven fabrics, the strength is at most 400k
gf / cm, and particularly when the weir height exceeds 6 m, the above problem cannot be largely solved. In other words, even if a rubber damper made of this woven fabric is used for the above-mentioned rubber dam having a weir height of 6 m, the number of laminations is reduced to only four layers, and there is a slight improvement in the reliability and economy of the bonding surface. Although it can be seen, for example, the reliability of the bonding is still lower than that of the conventional case where the number of layers is two. In addition, the thickness and weight of the woven fabric are increased according to the strength, so that the thickness and weight of the membrane material become almost the same as before, and thus there is a problem that the transportability, workability, and bending fatigue resistance are hardly improved. Also, the strength that can be achieved with nylon woven fabric is as low as about 600 kgf / cm due to the capacity of the loom.
There is also a problem that the number of laminations cannot be reduced beyond a certain level.

Accordingly, the present invention provides a thin and light high-strength weir to increase the reliability, durability, workability, etc., of a weir with a high weir height, which can secure the strength required for a film material with a small number of layers. The task is to realize and provide a rubberized cloth.

[0007]

In order to solve the above-mentioned problems, according to the present invention, the material of a woven fabric, which is a strength member of a rubber cloth for a rubber dam, is twice or more as strong as nylon or polyester fibers. Aramid fiber having a tensile strength of 800 kgf / cm in the warp direction of the woven fabric made of aramid fiber
As described above, the tensile strength in the weft direction is 2/3 of the tensile strength in the warp direction.
That is all.

[0008] The high-strength rubberized cloth of the present invention constituted by coating the woven cloth with rubber preferably has a woven structure of basket woven.

The ratio of the number of warp yarns to the number of weft yarns constituting the woven fabric (the number of weft yarns / the number of warp yarns)
However, those in the range of 0.5 to 0.8, those in which the fineness of the original yarn constituting the woven fabric is 3000 denier or more, and those in which the fineness of the weft constituting the woven fabric is smaller than the fineness of the warp are also preferable. .

[0010]

In the present invention, aramid fibers are used as the material of the woven fabric in order to secure high strength with a woven fabric which is as thin and light as possible. Aramid fiber has strength of 20-24g / d
(D: unit of denier and yarn fineness (thickness)), which is twice or more as compared with the strength of nylon fiber or polyester fiber of 8 to 9 g / d. Since the thickness and weight of the woven fabric are determined by the total denier of the yarns constituting the woven fabric (the volume of the yarn present per unit area is replaced by the fineness), for example, a woven fabric of the same strength is aramid fiber and nylon fiber In the case of weaving with a yarn consisting of aramid fibers, the thickness and weight of the woven fabric made of aramid fibers are half or less of the thickness and weight of the woven fabric made of nylon fibers.

Therefore, the membrane material of the present invention, in which the high-strength rubber-coated cloth employing the aramid fiber is laminated, is thinner and lighter than the conventional laminated rubber-coated cloth made of nylon fiber, so that it is resistant to bending fatigue and transportability. There is a great advantage in terms of workability.

Further, when it is desired to increase the thickness of the rubber layer existing on the outer surface of the film material for imparting abrasion resistance, and when fixing the thickness of the film material, a sufficient thickness is secured as compared with the film material using nylon woven fabric. If the thickness of the rubber layer needs to be fixed, the required rubber thickness can be secured with a thinner film material.

Here, in the present invention, the strength of the woven fabric is set to 80.
The reason for setting the pressure to 0 kgf / cm or more is as follows. FIG.
An example of a film material using a conventional rubberized cloth and a film material using the high-strength rubberized cloth of the present invention are shown in Fig. 2. For example, when the weir height is 6 m, the film material needs a strength of 1600 kgf / cm. When a conventional rubberized cloth (strength is 400 kgf / cm) is used, it is necessary to laminate four layers.
When the high-strength rubberized cloth of the present invention having a strength of kgf / cm is used, two layers may be laminated. Also, since a high-strength woven fabric can be adopted according to the weir height, for example, 3200 kgf
For a rubber weir having a weir height of 8 m, which requires a strength of / cm, two layers may be used if the high-strength rubberized cloth of the present invention having a strength of 1600 kgf / cm is used. If this is a conventional rubberized cloth, eight layers must be laminated.

That is, in the present invention, the strength of the woven fabric is 800 k.
By setting the strength to gf / cm or more and freely selecting the strength according to the weir height, the same number of laminated films as the currently used two to three-layer laminated film material can be applied even when the weir height is 6 m or more. Therefore, it has remarkable advantages in terms of bending fatigue resistance and reliability of bonding of each layer as compared with the conventional multilayer laminated film material, and especially the reliability of bonding of the latter is as high as the current state. However, although not as great as nylon woven fabrics, due to weaving problems, the achievable strength is limited to about 2000 kgf / cm, and the high-strength woven fabric of the present invention can be applied from the viewpoint of suppressing the number of layers to three or less. It is appropriate that the maximum weir height of the rubber weir is 12 m (the required strength is about 6000 kgf / cm).

The reason why the tensile strength of the woven fabric in the weft direction is set to 2/3 or more of that in the warp direction is that the rubber dam which is generally cylindrical as shown in FIG. direction)
1 in the longitudinal direction (the direction of arrow 12) at most 2
Since a tension of / 3 is applied, the weft direction of the woven fabric constituting the rubberized cloth is adjusted to the longitudinal direction so that the woven fabric has a strength corresponding to the tension in the circumferential direction and the longitudinal direction.

The woven fabric for a high-strength rubberized fabric of the present invention is desirably basket-woven as described above.
This is because, when a cord having a large fineness (thickness) is used as in the present invention and the number of driving is increased, irregularities and undulations on the woven fabric surface are increased in a twill weave, a satin weave, and the like, and the coating rubber thickness is not increased. In addition to the fact that a smooth rubber-coated cloth surface related to the reliability of the bonding surface cannot be obtained, the actual strength of the yarn becomes smaller than that calculated from the original yarn strength due to factors such as yarn bending. This is because the decrease is large.

Usually, the strong utilization rate of basket weave is 90 to
This value is 7% for twill and satin weave.
It falls to 0-80%. Plain weave is superior to basket weave in terms of surface smoothness and strength utilization rate.However, since the number of shots is limited as compared with basket weave, the fineness of the cord must be reduced to achieve the target strength of the present invention. It must be larger than in the case, and as a result, the surface smoothness and the power utilization rate are inferior to those in the case of basket weave. If the strength utilization rate is low, the required strength cannot be ensured unless a thicker yarn is used, and as a result, the thickness and weight tend to increase. In other words, basket weave is the most balanced structure in these respects.

The number of warp yarns and the number of weft yarns constituting the woven fabric can be freely selected as long as the necessary strength conditions are satisfied. The ratio (number of weft yarns / number of warp yarns) is 0.5 to 0.8. Is desirably within the range. For example, when the fineness of the warp and the fineness of the weft are significantly different, or when the strength in the weft direction is equal to or greater than the strength in the warp direction, this ratio is out of the range, but the surface smoothness, weight,
It is disadvantageous in terms of thickness and economy in comparison with those within the range.

Further, according to the present invention, the fineness of the raw yarn is 3000
It is desirable to be d or more. Normally, when the original yarn is twisted into one yarn, the fineness (thickness) of the original yarn is preferably larger. In other words, in general, when trying to obtain a high-strength woven fabric, the yarn constituting the fabric becomes very thick, but when it is thicker than a certain degree, the strength utilization rate decreases, and the degree increases as the number of twists of the original yarn increases. . That is, as the fineness of the original yarn increases, the number of twists of the original yarn constituting the cord having a certain thickness can be reduced, and a woven fabric having the required strength can be obtained effectively. In this regard, in the present invention, it is desirable that the fineness of the original yarn is 3000d or more, and since the high utilization rate is high and a thinner yarn can realize high strength, 3000d
There are great advantages in terms of thickness and weight as compared with the case where the following woven fabric is used.

In the case where the fineness of the yarn is large as in the present invention, it is also effective to make the fineness of the weft slightly smaller than that of the warp in order to minimize the reduction in the power utilization rate. If this difference is too large, there is a disadvantage in terms of smoothness as described above, or there is a problem that the required strength cannot be achieved.However, it is possible to suppress the warp of the warp to a small value by making the fineness of the weft smaller than that of the warp. Because it is possible, it is effective in maintaining a strong utilization rate.

[0021]

FIG. 1 shows an embodiment of a high-strength rubberized cloth according to the present invention. This high-strength rubber-coated cloth 1 is obtained by coating a synthetic rubber on a woven cloth 3 made of aramid fiber (5 is coated rubber).
It is made. The woven fabric 3 satisfies the necessary conditions (the former is 800 kgf / cm or more, and the latter is ／ or more of the former) with respect to the tensile strength in the warp direction and the weft direction.

FIG. 2 shows a conventional rubberized cloth having the same strength as that of FIG. 1, and is made by coating a woven nylon fiber fabric 4 with synthetic rubber. As can be seen from FIGS. 1 and 2,
The rubberized cloth of the present invention has a thickness t substantially halved as compared with a conventional product, and the weight is greatly reduced.

FIG. 3 shows a membrane material for a rubber weir having a weir height of 6 m made by using the rubber cloth of FIGS. 1 and 2. The film material 6 shown in FIG. 3A using the rubber cloth 1 of the present invention shown in FIG. 1 has two laminated rubber cloths, whereas the film material 6 shown in FIG. The film material 7 of (b) has four layers, the number of which is doubled to obtain the same strength, and there is a great difference in the thickness, rigidity, area of the bonding surface and the like.

[0024]

Example 1 A film material used for a rubber dam having a height of 6 m is 16
It is necessary to have a strength of 00 kgf / cm (warp direction). Two layers of rubberized cloth (the structure of Fig. 3 (a))
To ensure that the tensile strength in the warp direction is 800 kgf
/ Cm 4 or more of the aramid fiber woven fabrics of No. 1 to No. 4 in Table 1 are designed and woven, and the respective structures, performances, and rubberized fabrics using the woven fabrics are laminated to form a membrane material. The performance of the cases was compared. As a comparative example, a woven fabric using nylon fibers, which has been used in products, was selected. The results are shown in Table 1.

[0025]

[Table 1]

The numbers of laminations, weights, and thicknesses in Table 1 are for the case of a film material, and the others indicate the structure and characteristics of the rubberized cloth per layer.

As can be seen from Table 1, Examples Nos.
No. 4 indicates the number of layers (the smaller the number, the more flexible,
Excellent in the reliability of the laminated surface), weight (the smaller the transportability,
It is superior to the comparative example in both points of excellent workability) and thickness (the thinner, the better the flexibility and the resistance to bending fatigue).

Also, from the comparison between Example No. 1 and Nos. 2 to 4, the 2 × 2 basket weave can be driven more efficiently than the plain weave, so that the weight and thickness can be reduced. It turned out that it was excellent in point.

Further, even in the same 2 × 2 basket weave, if the ratio of the number of yarns (the ratio of the number of wefts / the number of warps determined by the formula of the number of warp yarns) is in the range of 0.5 to 0.8 (No. Out of the range, No. 3 and 4 are within the range) It was found that the weight and thickness can be reduced by improving the strength utilization rate of the warp.

If the yarn having a fineness of 3000d or more (No. 4) is selected as the original yarn, the warp yarn utilization rate is improved more than that of the yarn less than 3000d (Nos. 2 and 3), and the weight and thickness of the yarn are further increased. It has been confirmed that it leads to reduction.

[0031]

Embodiment 2 The membrane material used for a rubber weir with a height of 10 m is 45
Since a tensile strength of 00 kgf / cm was required, woven fabrics (Examples No. 5 and No. 6) using aramid fibers suitable for constituting this membrane material were manufactured and their performances were compared. Table 2 shows the results. As shown in Table 2, in this case also, it was confirmed that the high-strength rubber-coated cloth of the present invention exhibited sufficiently better performance than the conventional one. It was also found that making the fineness of the weft or warp smaller than that of the other improves the strength utilization rate and leads to a further reduction in weight and thickness.

[0032]

[Table 2]

[0033]

As described above, an aramid fibrous high-strength woven fabric having a tensile strength in the warp direction of 800 kg / cm or more and a tensile strength in the weft direction of 2/3 or more of that in the warp direction. By using as a strength member of the membrane material of the flexible membrane undulating weir, it is possible to significantly reduce the weight, thickness, and cost of the membrane material, especially when the weir height is 6 m or more, than in the past.
Membrane material performance, its reliability, transportability, and workability can be significantly improved.

Further, since the aramid fiber has a very small creep, the problem of the decrease in the weir high precision which exists in the membrane material made of the nylon fiber can be almost completely solved by the present invention.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a high-strength rubberized cloth of the present invention.

2 is a sectional view of a conventional rubberized cloth having the same strength as that of the rubberized cloth of FIG. 1;

3 is a diagram illustrating a comparison between a rubber damping membrane material (a) having a dam height of 6 m formed by laminating rubber damping cloths and the same rubber damping membrane material (b) formed of the rubber damping cloth of FIG. 2; Figure shown

FIG. 4 is a front view of an undulating weir (rubber weir) made of a flexible membrane.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 High-strength rubberized cloth of the present invention 2 Conventional rubberized cloth using nylon woven cloth 3 Woven cloth of aramid fiber 4 Woven cloth of nylon fiber 5 Coated rubber 6 Weir height 6 m made with rubberized cloth of the present invention 7 Rubber dam membrane material made of conventional rubber cloth with a damping height of 6 m 8 Submersion 9 Envelope 10 Rubber dam 11 Circumferential direction of rubber dam (warp direction of woven fabric) 12 Rubber dam Longitudinal direction (weft direction of woven fabric)

Claims (5)

[Claims] 1. A tensile strength in the warp direction of 800 kgf / c
m or more, the tensile strength in the weft direction is 2 times the tensile strength in the warp direction.
A high-strength rubberized cloth for undulating weirs made of a flexible membrane made by coating a rubber on a high-strength woven fabric made of aramid fiber of / 3 or more. 2. The high-strength rubberized cloth for flexible weirs according to claim 1, wherein the woven fabric has a weave structure of a basket weave. 3. The ratio of the number of warp yarns and the number of weft yarns constituting the woven fabric (the number of weft yarns / the number of warp yarns) is as follows:
2. The method according to claim 1, wherein the distance is in the range of 0.5 to 0.8.
Or a high-strength rubberized cloth for undulating weirs made of a flexible membrane according to 2; 4. A fiber comprising a woven fabric having a fineness of 3,000 denier or more.
The high-strength rubberized cloth for undulation weirs made of a flexible membrane according to 1. 5. The high-strength rubber-coated cloth for a weir made of a flexible membrane according to claim 1, wherein the fineness of the weft constituting the woven fabric is smaller than the fineness of the warp.