JP2596428B2 - Strong rubberized cloth for flexible membrane dam - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a rubber cloth used as a covering (membrane main body) of a flexible membrane weir laid across a water channel.

2. Description of the Related Art Flexible membrane weirs (commonly known as rubber weirs) that rise and fall due to the supply and discharge of fluids (air, water, etc.) include, for example, a weir for intake of agricultural water, a seawall to prevent storm surge, Used for seawater damming at estuaries.

FIG. 3 shows an example of this, in which a flexible membrane weir 03 is laid along a riverbed 01 and both sides 02 across a river. The envelope, which is the main body of the flexible membrane weir 03, is formed by folding a large-area rubber-coated cloth into two parts, and the open-side edge is fixed to the riverbed 01 and the law part 02. When a fluid is injected into the envelope, the envelope expands in a cylindrical shape and stands up. The height (H) of the standing flexible membrane weir 03 is usually 3 m or less (regulation by law).

However, in the case of the envelope which expands in a cylindrical shape under the internal pressure, when the magnitude of the stress generated in the envelope in the circumferential direction (the direction of the arrow A in FIG. 3) is σ, the longitudinal direction (the direction of the arrow B in FIG. 3).
The magnitude of the stress generated in the wrapping is σ / 2, and the conventional woven fabric (up to 600 kg / cm warp strength, up to 200 weft strength)
kg / cm, maximum width 1.5 m) is used to reinforce the rubber film in the form shown in FIG. That is, a plurality of woven fabrics 04 having a length corresponding to the circumferential length of the wrapping are superimposed on each other in the weft direction (B direction) and sequentially joined (see reference numeral 05). Strengthens the rubber layer.

As described above, in the conventional rubber-coated cloth manufacturing method using the woven fabric by matching the warp in the circumferential direction of the envelope (the direction of arrow A), the woven fabric provided as a continuous band is cut into a predetermined length and cut. A large number of woven fabrics 04 must be joined by a large number of overlapping portions 05, which requires a great deal of labor and hinders productivity. Incidentally, when laying a flexible membrane weir 03 across a river with a river width of 100 m, 67 sheets (100 / 1.5) of woven cloth 04 are added to 66 overlapping sections 05
Must be joined together.

On the other hand, as shown in FIG. 5, in the new rubberized cloth manufacturing method using the woven fabric by matching the warp yarns in the longitudinal direction of the wrapping (the direction of arrow B), a small number of wrappings matching the length of the foreskin are used. Woven fabrics 06 are superposed on each other in the weft direction (A direction) and sequentially joined (see reference numeral 07), and the labor for obtaining the obtained large-area woven fabric can be greatly reduced as compared with the conventional method. And contribute to the improvement of productivity. By the way, if the weir height (H) is 5 m, 11 (5π / 1.5) woven fabrics 06 are added to ten overlapping portions 07.
What is necessary is just to join.

However, this method for producing a rubberized cloth has a weir height (H) = 5.
When applied to a 6m large weir, circumferential strength 1000-1440kg / c
m, the conventional woven fabric with a weft strength of 200 kg / cm or less must be laminated in 5 to 8 layers, and the rigidity of the rubberized cloth becomes excessive. Drawbacks such as increased woven fabric and rubber usage, which is uneconomical, increased weft yarn elongation, and a smaller surface area of the weft yarn, resulting in insufficient bonding strength in the transverse direction (direction A in FIG. 5). There is.

Means for Solving the Problems and Action The present invention has been made in view of such a technical background, and a flexible membrane having a large weir height without increasing the number of layers of reinforcing woven fabric. Weirs can be obtained (see Fig. 5),
Moreover, it is an object of the present invention to provide a strong rubberized cloth which can be efficiently manufactured.

For this purpose, the breaking strength in the weft direction is 250 kg / cm or more,
A flexible membrane weir made of a woven fabric having a breaking strength in the warp direction equal to or greater than 2/3 that of the weft direction, coated with rubber, and the weft direction directed in the circumferential direction of the flexible membrane weir. This is achieved by providing a strong rubberized cloth.

In the case of a cylindrical inflatable envelope that receives internal pressure, the magnitude of the stress generated in the envelope in the circumferential direction (the direction of arrow A in FIG. 3) is represented by σ.
In this case, the magnitude of the stress generated in the envelope in the longitudinal direction (the direction of arrow B in FIG. 3) is σ / 2. Therefore, as for the strength of the wrapping reinforcement woven fabric, when the weft yarn strength directed in the A direction is T, the warp yarn strength T / 2 directed in the B direction is good. However, the stress generated in the longitudinal direction of the wrapping (in the direction of arrow B in FIG. 3) in the vicinity of being fixed to the normal part is 2σ / 3 at maximum.
It is necessary to set the warp strength to 2T / 3 or more.

Also, as shown in FIG. 1, the wrapping reinforcing woven fabrics 1, 1... Are joined in a cross-polymerized form in the direction of arrow A (the direction of the weft), which requires greater strength than the longitudinal direction. 2)
Therefore, in order to secure the joint strength (joint strength), it is necessary to suppress the elongation of the weft yarn, increase the density of the warp yarn and the weft yarn, suppress the width shrinkage of the woven fabric at the time of joining (at the time of bonding), It is effective to increase the number of weft yarns and increase the thickness (large surface area) of the weft yarn so as to increase the bonding area. In connection with these requirements, the selection of the material of the weft yarn and the fabric structure is also important.

Weft material: Nylon fiber with high strength and good adhesiveness is recommended, and nylon 66 having a smaller heat shrinkage and elongation than nylon 6 is preferable.

Textile structure: Plain weave, weft half mat weave, 2/2 deformed twill weave are recommended for improving the strength in the weft direction and suppressing the elongation in the weft direction, and weft half mat weave is particularly preferable. The warp half mat weave and the basket weave are not preferred because the elongation in the weft direction increases.

The woven fibers of the plain weave (a), the weft half mat weave (b), and the 2/2 modified twill weave (c) as an example are as shown in Fig. 2 (where 3 is the warp and 4 is the weft). Is shown).

A rubberized cloth formed by laminating a plurality of large-area woven fabrics obtained by joining the woven fabrics having such a configuration in the direction of arrow A (weft direction) and reinforcing the rubber layer is a weft yarn. The number of laminations is smaller than when a conventional woven fabric having a breaking strength in the direction of 200 kg / cm or less is used in a mode in which the weft yarns are aligned with the circumferential direction of the envelope, and the thickness of the envelope is relatively large. The size and weight are reduced and the number of man-hours for manufacturing the envelope is reduced (improvement in productivity). In addition, in a weft in which the elongation is suppressed and the joining area is increased, a sufficiently large joining strength in the direction of arrow A can be secured. Compared with the conventional woven fabric connection method shown in FIG. 4, the number of woven fabric joints can be greatly reduced, and not only can the operation efficiency be improved, but also the reliability of the joints can be greatly improved. To improve. By the way, the breaking strength in the weft direction is 350 kg /
If woven cloth of cm is used, circumferential strength 1000-1440kg / c
In the case of a large weir (H = 5 to 6 m) requiring m, woven fabrics may be laminated in three layers.

Effects of the Invention As is clear from the above description, in the rubberized cloth of the present invention, the breaking strength in the weft direction is 250 kg / cm or more, and the breaking strength in the warp direction is 2/3 or more of that in the weft direction. It is made of a woven cloth having rubber, and the woven cloth is covered with rubber, and the weft direction is directed in the circumferential direction of the flexible membrane weir. The number of woven fabric layers to obtain a high strength is reduced, the thickness of the wrapping is reduced, the weight is reduced, and in the direction of the longitudinal dimension which is much longer than the circumference of the flexible membrane weir, By aligning the warp yarns of the woven fabric, the number of woven fabrics connected is reduced, the man-hours of the woven fabric connection work including cutting work are significantly reduced, and the efficiency of rubber-coated cloth manufacturing work is greatly improved, and costs are reduced. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a plurality of woven fabrics connected to obtain a rubberized cloth according to an example of the present invention, FIG. 2 is a view showing a woven fabric suitable for the woven cloth used in the present invention, and FIG. Fig. 4 is a front view of a flexible membrane weir shown in relation to a known woven cloth, and Fig. 4 is a perspective view showing a plurality of woven cloths connected to strengthen the covering of the flexible membrane weir. FIG. 5 is a perspective view showing a connected woven fabric for comparison with the woven fabric. 1 ... woven fabric, 2 ... joint, 3 ... warp, 4 ... weft.

Claims (1)

(57) [Claims] 1. A woven fabric having a breaking strength in the weft direction of not less than 250 kg / cm and a breaking strength in the warp direction of not less than 2/3 of that in the weft direction is coated with rubber. A strong rubberized cloth for a flexible membrane weir characterized by being oriented in a circumferential direction of the flexible membrane weir.