Method for multiple extension of water flow hanging film

Abstract

To provide a development method for preventing blow-up of a suspension membrane when a water flow suspension membrane is multiplexly developed.SOLUTION: Provided is a development method of a water flow suspension membrane in which, when connecting a float to the water flow suspension membrane formed of the suspension membrane provided at a lower part of the float, and multiplexly developing against the water flow, a weight is provided at a lower edge of the water flow suspension membrane set at the uppermost stream side of the water flow, and mooring rope is fitted from the lower edge of the suspension membrane, and the other end of the mooring rope is fixed.SELECTED DRAWING: Figure 7

Description

Technical Field

[0001] The present invention relates to a method for multi-expansion of a water-flow hanging film used for preventing pollution and recovering spilled oil, etc.

Background Art

[0002] Conventionally, an oil fence or the like in which a hanging film is suspended from a float generally has a hanging film provided below the float, and mooring ropes are attached to the floats at both ends and extended on the water surface at the site. However, when the water flow velocity at the site reaches 20 cm / second or more, the lower part of the hanging film is washed away and rolled up, the water depth (effective water depth) at the lower end of the hanging film becomes shallow, and the spilled oil slips under the hanging film, which is a drawback.

[0003] As a method for solving these drawbacks, for example, an oil fence comprising a float for floating on the water surface and an impermeable skirt attached to the lower part of the float to prevent floating substances such as oil from spreading on the water surface of rivers, lakes, seas, etc., in which a tension member is continuously provided in the extending direction of the lower end of the skirt, and a mooring rope is attached to the tension member has been proposed. (Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, if it is a single expansion as described above, the invention of Patent Document 1 is sufficient, but when it is fixed and multi-expanded, the invention method described in Patent Document 1 requires a huge amount of labor and cost for installation. Therefore, as a result of various studies on a simple method for a method of providing and fixing a water-flow hanging film multiple times, the present inventor has completed the present invention.

Means for Solving the Problem

[0006] That is, the present invention connects a water flow hanging film composed of a float and a hanging film provided below the float, and when multi-extending against the water flow, a weight is provided at the lower edge of the water flow hanging film installed on the most upstream side of the water flow, and a mooring rope is attached from the lower edge of the hanging film, and the other end of the mooring rope is fixed. This is a method for multi-extending a water flow inclined film.

Effect of the Invention

[0007] According to the method of the present invention, even for a fast water flow with a water flow velocity of 20 cm / second or more, it is only necessary to fix the water flow hanging film on the most upstream side of the water flow, and there is an advantage that the multi-extended hanging film will not be blown up and the installation can also be carried out in a short time.

Brief Description of the Drawings

[0008]

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Best Mode for Carrying Out the Invention

[0009] As the water flow hanging film used in the method of the present invention, as shown in FIG. 1, a so-called oil fence type in which a plurality of floats 2 are provided on the upper part of a single horizontally long hanging film 1 and a weight 3 is provided on the lower edge part, and a vertically long hanging film 4 as shown in FIG. 2 A so-called pollution prevention fence type in which a float 5 is provided on the upper part and a weight 6 is provided on the lower edge part is known.

[0010] In order to connect the oil fence type water flow hanging film shown in FIG. 1, a single water flow hanging film can be configured as shown in FIG. 3 by connecting the side edges of adjacent water flow hanging films to each other using appropriate means. In addition, in order to connect the pollution prevention fence type water flow hanging film shown in FIG. 2, a rope insertion port is provided in the float 5, and a single water flow hanging film as shown in FIG. 4 can be formed by inserting a rope into the rope insertion port (not shown). Further, a weight 7 can be provided at the lower edge part of each of the water flow hanging films shown in FIG. 2, but as shown in FIG. 5, a single long weight can also be provided at the lower edge parts of a plurality of hanging films. Furthermore, instead of the long weight shown in FIG. 6, the individual weights 6 can also be connected by a chain 8 and a shackle or a rope or the like. Those after the second row of these single water flow hanging films can be fixed, for example, by taking anchors from both ends of the upper part of a single water flow hanging film. FIG. 7 is a side view showing an example of a state in which the water flow hanging film shown in FIG. 2 is extended multiple times. As shown in FIG. 7, a mooring rope 10 is provided on the weight provided at the lower edge part of the water flow hanging film of a single water flow hanging film row 9 installed on the most upstream side of the water flow, and the other end is fixed to, for example, the bottom of the water. In addition, the fixing of the water flow hanging film rows after the second row can also be fixed by the front and rear water flow hanging film rows and the spacer S. When the water flow hanging film of the present invention is installed in an estuary, a harbor, etc., in a place where the flow is bidirectional due to ebb tide or flood tide, it is preferable to provide a mooring rope 9 to be moored to a weight provided at the lower edge of the first and last rows of water flow hanging film rows 9. FIG. 8 is a side view showing a state when the water flow hanging film at low tide is extended multiple times, and FIG. 9 is a side view showing a state when the water flow hanging film at high tide is extended multiple times.

[0011] According to the method of the present invention, as shown in FIG. 10, even when the water flow velocity is high, by fixing the water flow hanging film provided on the most upstream side of the water flow with a mooring rope, since the water flow hanging film on the most upstream side is curved in an arc shape, the water flow can be changed to an upwelling flow, resulting in weakening of the water flow, and the blowing up of the hanging film of the subsequent rows of water flow hanging films can be prevented. Therefore, since it is not necessary to fix the hanging films of the water flow hanging films from the second row onwards, there is an advantage that the installation work can be easily performed.

[0012] Further, in the method of the present invention, as shown in FIG. 11, by making the vertical length of the hanging film of the water flow hanging film provided on the most upstream side longer than the hanging films of the water flow hanging films from the second row onwards, the prevention effect of the blowing up of the hanging films from the second row onwards is further improved.

[0013] In the method of the present invention, as described above, in order to maintain the interval between the front and rear water flow hanging film rows as shown in FIG. 12, it is preferable to provide a spacer S such as a float. Further, by providing the partition portion 12 in this way, even in a place where the flow is bidirectional due to ebb tide or flood tide in an estuary, a harbor, etc., the floating substances accumulated in the partition portion 12 are not diffused. Further, by providing the partition portion 12 in this way, floating substances such as pumice can be accumulated in the partition portion 12. The method of the present invention can be suitably constructed particularly in waterways, lakes, rivers, oceans, etc.

Explanation of Signs

[0014] 1 ··· Hanging film 2 ··· Float 3 ··· Weight 10 ··· Mooring rope

Claims

Claim 1: A method for multi-expansion of a water flow hanging film row under a water flow with a water flow velocity of 20 cm / sec or more, comprising connecting a water flow hanging film consisting of a float and a hanging film having a weight provided below the float to form a water flow hanging film row, multi-expanding the water flow hanging film row facing the water flow, providing a spacer between the multi-expanded water flow hanging film rows, and fixing the lower edge of the water flow hanging film row installed on the most upstream side of the water flow to the bottom of the water. A method for multi-expansion of a water flow hanging film row, characterized in that.

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