JPH08165632A - Rising/falling weir made of flexible film - Google Patents

Abstract

PURPOSE: To maintain necessary cutting resistance for a long period of time by providing the surface of a weir body with a cutting resistant layer, and making the durability of the cutting resistant layer sufficient. CONSTITUTION: Flexible film material 11 of such structure that metal knitted fabric 12 obtained by knitting corrosion resistant metal wire covered with a polymer is covered with rubber or plastic 13 is attached to the surface of a weir body 10 formed of rubber coated fabric 2. With this flexible film material 11 as a cutting resistant layer, the cutting resistance of the weir body 10 is heightened. In this structure, the corrosion preventing effect of the metal wire forming the metal knitted fabric is high, and the lowering of cutting resistance caused by corrosion is hardly generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flexible membrane undulating weir provided in a river for the purpose of controlling water storage. It should be noted that the river referred to in the present invention is a general term for all places where undulating weirs are installed, and includes not only general rivers but also outlets such as lakes and reservoirs, artificial drainage channels, and the like.

[0002]

2. Description of the Related Art A flexible membrane undulation weir is constructed by attaching a flexible membrane material to a river bed in a direction transverse to a river to form a bag-shaped weir body, and the weir body is filled with water inside the weir body. It controls the water storage upstream by inflating or standing up or contracting and falling by taking in and out a fluid such as air.
1702 and Japanese Patent Publication No. 44-2371.

The flexible membrane material used for the undulating weir is usually
A woven fabric made of organic fibers such as nylon and polyester is covered with rubber to be integrated (hereinafter referred to as a rubberized fabric). This rubberized cloth is used by laminating several sheets according to the required strength, but even if several sheets are laminated, the film is easily damaged by natural or artificial cutting force. For example, penetration damage due to driftwood, knife damage due to mischief, etc. are likely to occur, and if the internal fluid leaks due to this, the function of the weir is impaired.

Therefore, as a measure to improve the cut resistance of rubberized cloth, Japanese Utility Model Publication No. 62-7690 discloses a metal reinforcing material,
For example, it is proposed that the steel wire 3 shown in FIG. 4, the chain 4 shown in FIG. 5, the ceramic whiskers 5 shown in FIG. 6 and the like be integrally embedded in the rubber or plastic 1 of the rubberized cloth 2.

Further, in Japanese Patent Laid-Open No. 62-121221, a flexible film material obtained by coating a knitted fabric of metal fibers with rubber or plastic is attached to the surface of a rubberized cloth to form a cut resistant layer. Disclosed is protecting the litter.

[0006]

[Problems to be Solved by the Invention] Japanese Utility Model Publication 62-7690
In the technique of No. 3, there is a large difference in elongation between the metal reinforcing material and the rubber cloth, so that the cloth tends to crack at the boundary with the rubber, and the durability of the weir deteriorates. If the reinforcing material is a thin short fiber such as whiskers, sufficient cut resistance cannot be obtained.

On the other hand, in the technique of Japanese Patent Laid-Open No. 62-121221, since the reinforcing material is embedded in the film material provided separately from the rubberized cloth, the rubberized cloth can be prevented from cracking. Moreover, when a stretchable metal knitted fabric is used, it is possible to follow the elongation of the rubberized fabric. However, since there is water that penetrates from the end cross section of the membrane material and water that permeates the coated rubber, if the reinforcing material in the membrane material is easily rusted like steel, corrosion resistance becomes insufficient, Due to the progress of corrosion due to the long-term use of the undulating weir, the strength decreases and the cut resistance cannot be maintained for a long time.

Considering the ergonomic analysis value of the artificial cutting force, the cut resistance is to withstand piercing or cutting with a knife or the like with a force of 15 kgf or more. Considering the durability of the rubberized cloth, the maintenance period of this cut resistance is about 2
Although it has been zero years, there are some concerns about the conventional measures to improve the cut resistance.

Therefore, the present invention improves the technique of Japanese Patent Laid-Open No. 62-121221 which does not change the characteristics of the rubberized cloth,
An object of the present invention is to effectively prevent the corrosion of the reinforcing material in the film material for the cut resistant layer, which leads to the reduction of the cut resistance.

[0010]

In order to solve the above problems, in the present invention, a cut resistant layer is provided on at least a part of the outer surface of a bag-like weir body made of rubberized cloth, and the weir is formed by the cut resistant layer. In a flexible membrane undulation weir that enhances cut resistance of the body,
As the flexible film material for forming the cut-resistant layer, a corrosion-resistant metal wire coated with an organic or inorganic polymer is used as a knitted fabric, and this is coated with rubber or plastic.

As the reinforcing material, the corrosion resistant metal wire to be embedded in the flexible film material for forming the cut resistant layer is any of copper wire, stainless wire, titanium wire, chrome plated steel wire and nickel plated steel wire. Above all, stainless wire is preferable, and among them, SUS316 and SUS316L wires are particularly preferable. Also,
This wire is preferably made by twisting several single wires having a diameter of 0.2 mm or more.

For coating the metal wire, an organic polymer such as polyethylene, polyimide, polyamide-imide, or polytetrafluoroethylene, or an inorganic polymer such as polysilazane is coated or extrusion-coated. The coating polymer is particularly preferably a fluororesin.

Further, the attachment direction of the cut-resistant layer flexible film material is preferably determined so that the expansion / contraction direction of the knitted fabric is the same as the flow direction of the river. In addition, it is desirable that the knitted knitted fabric has a uniform opening of 2 cm or less, more preferably 1 cm or less.

[0014]

[Function] Since the polymer coated wire is used as the metal wire in the flexible film material for the cut resistant layer, even if the water penetrates the rubber and reaches the embedded portion of the metal wire, the water is blocked by the polymer coating. The metal wire is not directly touched and corrosion of the metal wire is effectively prevented. A metal wire coated with a fluororesin is particularly effective because it has water repellency on the surface and repels water. In addition, since chemical resistance is also imparted, it is protected against permeation of salt water and other corrosive liquids.

The metal wire is preferably a single wire with a diameter of 0.2 mm or more, which is twisted together.
If it is a filament of 2 mm or more, it cannot be easily cut with a blade, and if it has a large diameter, it will take time before the strength becomes insufficient even if it corrodes, and the maintenance time of the cut resistance will be longer accordingly. Furthermore, even when the twisted wire is flexible and knitted, it is easy to flexibly follow the movement of the rubberized cloth due to the upright and fall of the weir.

When the metal wire is knitted, the elongation of the metal wire is generally very small.
With the knitted fabric shown in Fig. 5, the elongation in the loop direction (arrow direction) can be set to 30% or more, which allows the cut-resistant layer film material to smoothly follow the elongation of the rubberized cloth when the weaving is performed. This is because, in addition to the elasticity of the rubberized cloth being maintained, the elasticity of the metal knitted fabric is also utilized to suppress the cracking of the rubber in the embedded portion.

Since the force exerted on the weir body by the flow of the river is large in the flow direction, the stretch of the rubberized cloth is large in the flow direction. Therefore, in order to bring out the effect of expansion and contraction more, the cut-resistant layer film material is preferably attached such that the extending direction of the metal knitted fabric is the same as the flow direction of the river.

In addition, the reason why the knitting of the knitted knit is preferably 2 cm or less, more preferably 1 cm or less is because the knife is less likely to penetrate as the knitting is smaller.

[0019]

EXAMPLE FIG. 1 shows an example of the undulating weir of the present invention. In the figure, 10 is a bag-like weir body that is attached to the river bed 14 across the river, and 11 is a flexible membrane material that is attached to the outer surface of the weir body. The cut resistance of the part that is easily damaged is improved.

As shown in FIG. 1 (c), the weir body 10 is made of one or a piece of rubberized cloth (flexible film material) 2 made by coating a woven or knitted fabric of organic fibers with rubber or plastic. It is made of several laminated materials.

As the flexible film material 11, a metal wire such as a stainless wire covered with a polymer is used as the knitting 1 as shown in FIG.
It is made by knitting into two and covering the metal knitting 12 with rubber or plastic 13 to integrate it. The metal knitted fabric 12 may be embedded by stacking several layers. For example, a two-layered knitted fabric can be easily formed by flattening a tubular knitted fabric. The flexible film material 11 reinforced with the metal knitting is attached to at least a part of the outer surface of the weir body 10 by adhering it. As shown in Fig. 1 (b), the weir body 10 is attached.
2 may be continuous in the circumferential direction, or as shown in FIG. 2, it may be discontinuous so that cut resistance is imparted only to necessary portions. In the longitudinal direction (width direction of the river), driftwood etc. may hit the entire area, so see Fig. 1 (a).
It is desirable to install them in a continuous state as described above, but in this direction as well, it is free to discontinuously install only in the necessary places.

A more detailed example will be given below.

Bare metal wires and polymer-coated metal wires having the materials and diameters shown in Table 1 are knitted, and EPDM rubber is topped on the knitted wires to bury the metal knitting, and the cut-resistant layer having the thickness shown in Table 1 is formed. A flexible membrane material (cut resistant cloth) was obtained.

As shown in FIG. 1 (c), this membrane material was attached to the surface of the rubberized cloth for the weir body to evaluate the cut resistance.

The evaluation test was carried out using the test apparatus shown in FIG.
10% with a pulling machine 21 on a test piece 20 with a cut resistant cloth on top
Commercially available cutter with the growth of 2 (trade name NT cutter) 2
The force required for 2 to penetrate the test piece 20 (penetration force) and the force required for cutting (cutting force) were measured. Penetration was examined using weight 23.

The corrosion resistance of the trial cut pull cloth was evaluated by how much the penetration force and the cutting force decrease at the beginning of the test and after the test piece was immersed in 20% salt water at 70 ° C. for 60 days.

Fluorine resin in Table 1 is NP-20 which is FEP (tetrafluoroethylene-hexafluoropropylene copolymer) resin manufactured by Daikin Co., Ltd., and polyethylene is AM0810 manufactured by Nippon Petrochemical Co., Ltd. Each was coated on a metal wire with an extruder. The polysilazane was coated by a method of applying a heat treatment by applying it to a metal wire using PHPS (perhydropolysilazane) manufactured by Tonen.

Table 1 also shows Comparative Examples 1 to 3 in which a metal wire not coated with a polymer is used.

[0029]

[Table 1]

As can be seen from Table 1, in the comparative example using the metal wire without the polymer coating, the penetrating force and the cutting force after the immersion in the salt water are remarkably reduced, but the reduction values are small in all the examples. It has excellent corrosion resistance. Among them, the one using the fluorine resin-coated metal wire retains the initial penetrating force and the cutting force as they are, and thus has a great effect of improving the corrosion resistance.

In Examples 8 and 9, the initial cut resistance is maintained even after immersion in salt water, but the cut resistance is a guide because the wire diameter of the metal wire is too small or the knitting is rough. The value of 15 kgf or more is not obtained, which is not preferable.

Table 2 shows a cut-resistant pulling cloth made by embedding a knitted knit of polymer-coated metal wire in rubber, with the stretch direction of the knitted knit being in the same direction as the water flow or perpendicular to the water flow. The result of observing the peeling state of the rubber of the cut resistant pulling cloth after the undulation test is shown, in which the weir is expanded and contracted to cause it to undulate for 500 times after being attached to the outer surface of the weir body.

[0033]

[Table 2]

From this result, it is effective to make the stretching direction of the knitted fabric the same as the water flow direction.

[0035]

As described above, in the present invention, since the cut-resistant layer on the surface of the weir body is formed by the flexible membrane material reinforced by the knitted knitted polymer-coated corrosion-resistant metal wire, the effect of preventing corrosion of the metal wire is obtained. The cutting resistance can be maintained for a long time.

The one using a fluorine resin as the coating polymer has a great effect of preventing the corrosion of the metal wire, and the one having the expansion and contraction direction of the knitted fabric oriented in the flow direction of the river causes peeling of the knitted fabric from the coated rubber or the like. It is unlikely to occur and the cut resistance is maintained more stably.

[Brief description of drawings]

FIG. 1A is a cross-sectional view showing an example of a flexible film undulating weir of the present invention. FIG. 1B is a transverse cross-sectional view of the weir of the above. FIG. 1C is a portion of a rubberized cloth provided with a cut-resistant layer. Enlarged sectional view of

FIG. 2 is a cross-sectional view showing another example of installation of the cut resistant layer.

FIG. 3 is a plan view of a metal knit.

FIG. 4 is a perspective view of a conventional rubberized cloth for a weir having cut resistance.

FIG. 5 is a cross-sectional view of another example of a conventional rubberized cloth for weirs.

FIG. 6 is a cross-sectional view of another example of a conventional rubberized cloth for weirs.

FIG. 7 is a diagram showing an outline of a performance evaluation test device.

[Explanation of symbols]

 1, 13 Rubber or plastic 2 Rubberized cloth 3 Steel wire 4 Chain 5 Ceramic whisker 10 Weir body 11 Flexible film material for cut resistant layer 12 Metal knitted fabric 14 Riverbed 20 Specimen 21 Tensioner 22 Cutter 23 Weight

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[Procedure amendment]

[Submission date] November 22, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

A bare metal wire and a polymer-coated metal wire having the materials and diameters shown in Table 1 were knitted into knits, which were used for the weir body.
The raw kneaded rubber was topped to bury the metal knitted fabric to obtain a flexible film material for cut resistant layer (cut resistant cloth) having the thickness shown in Table 1.

Front Page Continuation (72) Inventor Akira Nishimura 1-3-3 Shimaya, Konohana-ku, Osaka City Sumitomo Electric Industries, Ltd. Osaka Works

Claims (3)

[Claims] 1. A flexible membrane material is attached to a river bed in a direction that traverses a river to form a bag-like weir body, and the weir body is expanded and erected and contracted and collapsed by letting a fluid into and out of the weir body. In the undulating weir, a cut-resistant layer is provided on at least a part of the outer surface of the weir body, and the cut-resistant layer is a knitted knitted corrosion-resistant metal wire coated with an organic or inorganic polymer, which is coated with rubber or plastic. An undulating weir made of a flexible film, which is made of a flexible film material. 2. The polymer for coating the corrosion-resistant metal wire,
The undulating weir made of a flexible film according to claim 1, which is a fluororesin. 3. The flexible film according to claim 1, wherein the attachment direction of the cut-resistant layer flexible film material is determined so that the stretching direction of the knitted fabric is the same as the flow direction of the river. Made up and down weir.