JP2016199854A - Pollution prevention device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pollution prevention device that suppresses turbidity of water stored in a reservoir and others, while allowing surface layer water to circulate selectively.SOLUTION: A pollution prevention device includes a float part 20 floating on water, a pollution prevention film 10 hung from the float part 20 through a tension belt 40, and a weight 30 fitted at a bottom edge part of the pollution prevention film 10. The pollution prevention film 10 includes a surface layer opening 12 that allows surface water to circulate through the float part 20, and an impermeable curtain part 11 below the surface layer opening 12. By installing such a pollution prevention device 1 on an upstream side almost in parallel to and leaving an interval from a dam body of a reservoir and others, turbidity of stored water on a downstream side may be suppressed and the surface layer water may circulate toward the downstream side.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a pollution control device that suppresses the turbidity of water stored in a reservoir such as a reservoir and allows selective circulation of surface water.

  Conventionally, as a device for preventing turbidity of water in a dam reservoir or the like, for example, as described in Patent Documents 1 to 3, a float is provided at the upper end, and a pollution prevention film made of a polyester woven fabric is hung on the float. A pollution control device is used which is attached to a lower end of which is attached a weight consisting of a chain to prevent it from being touched.

  The pollution prevention device of Patent Document 1 floats a float in a closed water area such as a dam reservoir in the transverse direction and suspends a pollution prevention film from the float in the water of the closed water area. The upper layer portion is separated into an upstream side and a downstream side. The anti-fouling film is a sheet having water barrier properties and strength, and the length of the sheet in the water depth direction is the length of the water depth up to the non-light layer.

  Further, in the pollution prevention devices of Patent Literature 2 and Patent Literature 3, the float and the pollution prevention film are connected by a tension belt. The tension belt has an upper edge of the tension belt connected to the lower edge of the float, and an upper edge of the antifouling film connected to the lower edge of the tension belt. Furthermore, for example, in Patent Document 2, a tension belt is provided at the boundary between the float and the pollution prevention film, and the tension belt is attached with a rectangular plate-like substrate and a connection fitting made of a D-shaped ring. An apparatus is described. By connecting the connecting bracket, the shackle on the front side of the tension belt, and the shackle on the rear side with a ring-shaped bracket, the adjacent pollution control device is firmly connected.

  By the way, in this kind of pollution prevention device, a float falls according to a fall of a water level, and a deflection comes to arise in a pollution prevention film. Therefore, conventionally, as described in Patent Document 3, for example, an intermediate float is attached to an intermediate portion of the pollution prevention film to prevent the pollution prevention film from being bent. The intermediate float is provided so as to float on the water surface when the water level becomes low, and the anti-contamination film between the intermediate float and the weight at the lower end is formed as vertically as possible. I have to.

Japanese Patent Laid-Open No. 10-60874 Japanese Patent Laid-Open No. 4-64614 JP 9-53222 A

  However, in these conventional pollution prevention devices, since the pollution prevention film is provided from the float part to the connection part without any gap, it is impossible for surface water to circulate.

  In recent years, radioactive cesium has been detected from mud deposited at the bottom of a large number of reservoirs in Fukushima Prefecture, and its concentration is extremely high at 10,000 to 150,000 Bq / kg. Since radioactive cesium is firmly adsorbed by mud clay particles, it has been confirmed by investigation that there is no effect on the downstream side if clay particles do not flow out. However, some of the clay particles have a particle size of 10 μm or less, and the sedimentation time is long. In addition, since the intake of the reservoir is instructed to be conducted from the surface layer, a device is required that can selectively circulate the surface layer water and take water even when the water level fluctuates.

  An object of the present invention is to provide a pollution control device that suppresses the turbidity of water stored in a reservoir such as a reservoir and allows selective circulation of surface water.

  In order to solve the above problem, the present inventors suspended a pollution prevention film via a tension belt on a float part floating on water, and provided with a weight at the lower end of the pollution prevention film, It has been found that the problem can be solved by providing a surface layer opening through which the surface layer water can circulate in the anti-pollution film or the float part, and including a water-impermeable curtain part under the surface layer opening. That is, according to the present invention, the following pollution control device is provided.

[1] A float part floating on water, a pollution prevention film suspended through a tension belt on the float part, and a weight attached to a lower end part of the pollution prevention film, An anti-pollution device comprising a surface layer opening through which surface layer water can circulate in a prevention film or the float part, and an impermeable curtain part under the surface layer opening.

[2] The pollution control device according to [1], wherein the surface layer opening is a net.

[3] The first surface of the tension belt is attached to the upper end of the antifouling film, and the second surface of the tension belt is attached to the outer peripheral surface of the float part. The pollution control apparatus as described.

[4] The method according to any one of [1] to [3], wherein an auxiliary weight for subsidence for preventing deflection of the antifouling film is provided on any one of the front side and the back side of the curtain portion. Pollution prevention device.

[5] The pollution control device according to any one of [1] to [4], wherein the subsidence auxiliary weight is provided on a reinforcing belt extending in a direction substantially parallel to the float portion.

[6] The pollution control device according to [4] or [5], wherein the subsidizing auxiliary weight is a chain.

[7] The pollution control device according to any one of [1] to [6], further including an impermeable apron curtain disposed along the bottom of the water at a lower end portion of the pollution prevention film.

  The pollution control device of the present invention is a float part floating on water, a pollution prevention film suspended on the float part via a tension belt, a weight attached to the lower end of the pollution prevention film, A surface layer opening through which the surface water can circulate in the anti-pollution membrane or the float part, and a water-impermeable curtain part under the surface layer opening, so that the surface layer water circulates in the surface layer opening, Since the sedimentation of the clay particles is promoted at the part and the re-floating can be suppressed, the surface water can be selectively taken. Further, when the anti-contamination film has a surface layer opening, it is preferable that the first surface of the tension belt is attached to the upper end of the anti-contamination film, and the second surface of the tension belt adheres to the outer peripheral surface of the float portion. This makes it easier for the surface layer water to flow through the surface layer opening without being blocked by the tension belt. In addition, when an auxiliary weight for subsidence that prevents deflection of the anti-contamination film is provided on either the front side or the back side of the curtain part, the anti-contamination film does not move even when the water level of the reservoir or the like falls. It is possible to make it vertical without bending.

It is a front view which shows one Embodiment of the pollution prevention apparatus provided with the surface layer opening part in the pollution prevention film | membrane. It is explanatory drawing which shows one Embodiment of the float part provided with the surface layer opening part in the pollution prevention film | membrane. It is a front view which shows one Embodiment of the pollution prevention apparatus provided with the surface layer opening part in the float part. It is explanatory drawing which shows one Embodiment of the float part provided with the surface layer opening part in the float part. It is sectional drawing which shows one Embodiment of the pollution prevention apparatus provided with the surface layer opening part in the pollution prevention film | membrane. It is sectional drawing which shows the connection structure of the surface layer opening part of the pollution control apparatus provided with the surface layer opening part in the pollution control film | membrane. It is sectional drawing which shows one Embodiment of the pollution control apparatus provided with the surface layer opening part in the float part, and is sectional drawing of the AA 'part of FIG. 1C. It is sectional drawing which shows one Embodiment of the pollution control apparatus provided with the surface layer opening part in the float part, and is sectional drawing of the BB 'part of FIG. 1C. It is sectional drawing which shows the attachment structure of the auxiliary weight for subsidence of a pollution prevention apparatus. It is explanatory drawing which shows the installation state of a pollution prevention apparatus. It is sectional drawing which shows the installation state at the time of water filling of a pollution prevention apparatus. It is sectional drawing which shows the installation state at the time of the water level fall of a pollution prevention apparatus. It is a front view which shows one Embodiment of the pollution control apparatus provided with the apron curtain. It is explanatory drawing which shows the installation state of the pollution prevention apparatus provided with the apron curtain. It is an enlarged view which shows one Embodiment of a connection wrap part. It is explanatory drawing which shows the state which floated the float part of the pollution prevention apparatus on the water surface. It is explanatory drawing which shows the state which floated the float part of the pollution prevention apparatus provided with the apron curtain on the water surface.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments, and changes, modifications, and improvements can be added without departing from the scope of the invention.

  The pollution control device 1 of the present invention is attached to a float 20 that floats on water, a pollution prevention film 10 suspended on the float 20 via a tension belt 40, and a lower end of the pollution prevention film 10. Weight 30 is provided. Further, the pollution prevention film 10 or the float part 20 is provided with a surface layer opening 12 through which surface water 101 can flow, and an impermeable curtain part 11 is included under the surface layer opening 12. 1A, FIG. 1B, FIG. 2A, and FIG. 2B show an embodiment of the pollution prevention device 1 that includes a surface layer opening 12 in the pollution prevention film 10. Moreover, FIG. 1C, FIG. 1D, FIG. 2C, and FIG. 2D show one embodiment of the pollution preventing apparatus 1 provided with the surface layer opening 12 in the float part 20. When such a pollution prevention device 1 is installed in the reservoir 100 or the like, the surface water 101 flows through the surface opening 12 as shown in FIG. 3, and the clay particles 102 are dammed by the curtain portion 11 and descend. For this reason, it becomes possible to selectively take in the surface water 101.

  As shown in FIG. 1A, FIG. 2A and FIG. 2B, the pollution control device 1 provided with a surface layer opening 12 in the pollution control film 10 includes a surface layer opening 12 in the upper part, and a curtain part below the surface layer opening 12 11 is included. The anti-fouling film 10 may be formed by connecting the surface layer opening 12 and the curtain portion 11 of different materials by sewing, rope tying, bolting, or the like. A hole is provided above the curtain portion 11 to provide an opening. Also good. Further, the surface layer opening 12 has an opening 13, and the shape of the opening 13 is not particularly limited as long as the surface layer water 101 can circulate, but the surface layer opening 12 is preferably a net.

  Moreover, the float part 20 of the pollution prevention apparatus 1 provided with the surface layer opening part 12 in the pollution prevention film | membrane 10 is the float 22 of the substantially cylindrical body which consists of foam resin (for example, foamed styrene) with small specific gravity, as shown to FIG. 1B. And a float cover 21 made of a polyester campus.

  In the pollution prevention device 1 of the present invention, the pollution prevention film 10 is connected to the float part 20 via a tension belt 40 formed of polyester. However, when the pollution prevention film 10 of the pollution prevention device 1 is provided with the surface layer opening 12, the width of the surface of the tension belt 40 is wide and the width of the surface is sufficient to allow the surface water 101 to flow sufficiently. It is not preferable that the first edge is connected to the float part 20 and the second edge is connected to the antifouling film 10. Therefore, as shown in FIG. 2B, in the pollution prevention device 1 of this embodiment, the first surface of the tension belt 40 is attached to the upper end of the pollution prevention film 10, and the second surface of the tension belt 40 is the float portion 20. It is preferable that it adheres to the outer peripheral surface. Further, the second surface of the tension belt 40 is preferably attached to the outer peripheral surface of the float cover 21 with the second surface of the tension belt 40 and sewing. By providing the tension belt 40 in this manner, the surface water 101 can be easily distributed.

  On the other hand, as shown in FIG. 1C, FIG. 1D, FIG. 2C, and FIG. 2D, the pollution control apparatus 1 provided with the surface layer opening part 12 in the float part 20 is provided with the several float part 20, and the adjacent float part 20 It is preferable to connect to the antifouling film 10 via the tension belt 40 in a state where a space of a predetermined distance is provided between the float part 20 and the float part 20. A space between the adjacent float part 20 and the float part 20 is a surface layer opening 12 through which the surface water 101 can flow. As shown in FIG. 2C, when the pollution prevention device 1 is installed in the reservoir 100 or the like, the lower part of the float unit 20 floating on the water is arranged in a state of sinking below the water surface (underwater). For this reason, the tension belt 40 and the pollution prevention film | membrane 10 connected to the lower part of the float part will be in the state arrange | positioned in water. Therefore, as shown in FIG. 2D, the surface water 101 in the space between the adjacent float parts 20 is not blocked by the float part 20, the tension belt 40, and the antifouling film 10. Therefore, the surface water 101 can be circulated by the surface layer opening 12 which is a space between the adjacent float 20 and the float 20.

  Further, as shown in FIG. 1D, the float part 20 of the pollution control device 1 having the surface layer opening 12 in the float part 20 is formed on a substantially cylindrical float 22 made of a foam resin having a small specific gravity (for example, foam styrene). The float cover 21 is made of a polyester campus, and the lower portions of the plurality of float portions 20 are preferably attached to the tension belt 40 at a predetermined interval. Moreover, it is preferable that each float part 20 contains at least one float 22. Furthermore, it is preferable that both ends of the float cover 21 in the longitudinal direction of each float portion 20 are reinforced by the second reinforcing belt 15.

  As shown in FIG. 1C and FIG. 2C, the pollution control device 1 having the surface layer opening 12 in the float part 20 is impervious to water through a tension belt 40 formed of polyester at the lower part of the float part 20. The antifouling film 10 including the curtain part 11 is connected. In the tension belt 40 of this embodiment, the first edge in the width of the surface may be connected to the float part 20, and the second edge may be connected to the antifouling film 10. One surface may be attached to the upper end of the pollution prevention film 10, and the second surface of the tension belt 40 may be attached to the outer peripheral surface of the float portion 20.

Note that, in both the embodiment in which the pollution prevention film 10 is provided with the surface layer opening 12 and the embodiment in which the float portion 20 is provided with the surface layer opening 12, the vertical length of the surface layer opening 12 is larger than that of a reservoir such as a reservoir. It is preferable to determine based on the cross-sectional area of the intake weir (the cross-sectional area of the intake 105 for water to flow out of the overflow weir). The area of the surface layer opening 12 is preferably larger than the intake cross-sectional area of the overflow weir, and more preferably twice or more the intake cross-sectional area of the overflow weir. By setting the surface layer opening 12 to such an area, it is possible to prevent the pollution prevention device 1 from becoming a discharge obstacle during a flood. Therefore, when the cross-sectional area of the intake weir of the overflow weir is S (m ² ) and the length in the longitudinal direction of the pollution control device is L (m), the vertical length W (m) of the surface layer opening is W It is preferable that ≧ 2 S / L (see FIGS. 3 and 7 to 10). Moreover, by having the surface layer opening part of such a length of an up-down direction, mixing of the clay particle to the surface layer water can be prevented, and surface layer water can fully distribute | circulate.

  The curtain part 11 is preferably made of polyester, and the length of the curtain part 11 in the vertical direction is preferably matched to the underground topography at the time of the full water level. By setting it to such a length, it becomes possible to prevent turbidity of water even when the water level is full. A weight 30 is attached to the lower end portion of the curtain portion 11 so that the curtain portion 11 is vertical. As the weight 30, a chain, a lead rope, an iron plate, or the like is preferably used. These weights 30 are attached to the front surface side and / or the back surface side of the curtain portion 11 using a plurality of bolts. In order to reduce damage to the curtain portion 11, these weights 30 are provided downstream of the curtain portion 11. Preferably it is attached.

  Further, a wide first reinforcing belt 14 extending along the longitudinal direction of the curtain portion 11 is provided on the front surface side and / or the back surface side of the upper end portion and the lower end portion of the curtain portion 11, and the surfaces of the left and right side edge portions are provided. It is preferable that a wide first reinforcing belt 14 extending along the vertical direction of the curtain portion 11 is also provided on the side and / or the back side. As shown in FIG. 2B, when the pollution prevention film 10 includes the surface layer opening 12, the first reinforcing belt 14 extending along the longitudinal direction of the upper end portion of the curtain portion 11 includes the upper end of the curtain portion 11 and the surface layer. It is provided in the surface side and the back surface side in the state which pinched the lower end of the opening part 12, and it is preferable to connect the curtain part 11 and the surface layer opening part 12 by sewing with the sewing machine for heavy cloths.

  A plurality of narrow second reinforcing belts 15 extending along the longitudinal direction of the curtain portion 11 are preferably provided on the front surface side and / or the back surface side of the intermediate portion in the vertical direction of the curtain portion 11. . Also, in the longitudinal direction of the curtain part 11, it is preferable that a narrow second reinforcing belt 15 extending in the vertical direction of the curtain part 11 is provided at regular intervals. The first reinforcing belt 14 and the second reinforcing belt 15 are formed of, for example, a polyester woven fabric, and the tensile strength thereof is larger than that of the curtain portion 11. The width of the wide first reinforcing belt 14 is preferably about twice the width of the narrow second reinforcing belt 15, whereby the reinforcing strength of the peripheral portion of the curtain portion 11 is made stronger than the central portion of the curtain portion 11. Can also be increased.

  Further, it is preferable that an auxiliary weight 16 for subsidence for preventing the deflection of the antifouling film 10 is provided on either the front surface side or the back surface side of the curtain portion 11. Examples of the subsidizing auxiliary weight 16 include a chain, a lead rope, and an iron plate. Since the sinking auxiliary weight 16 applies a downward load, as shown in FIGS. 4 and 5, when the water level decreases, the sinking auxiliary weight 16 sinks accordingly. For this reason, it is possible to prevent the pollution prevention film 10 from being bent, to make the pollution prevention film 10 vertical, and to maintain the position of the surface layer opening 12.

  As shown in FIG. 2E, it is preferable that the subsidizing auxiliary weight 16 is provided in a curtain bag 17. By being covered with the curtain bag 17, damage to the curtain part 11 can be prevented. Further, the sinking auxiliary weight 16 is preferably provided on the first reinforcing belt 14 and / or the second reinforcing belt 15 extending in the longitudinal direction of the curtain portion 11. At this time, if the auxiliary weight 16 for sinking is in the curtain bag 17, the upper end of the curtain bag 17 is sandwiched between the curtain portion 11 and the second reinforcing belt 15 as shown in FIG. 2E. In this state, since it can be attached by sewing with a heavy duty sewing machine, attachment is easy. Furthermore, if such a sinking auxiliary weight 16 is attached to the downstream side of the curtain portion 11, damage to the curtain portion 11 can be further prevented.

  Furthermore, as shown in FIG. 6, it is preferable to have an apron curtain 45 disposed along the bottom 103 at the lower end portion of the pollution prevention film 10. The apron curtain 45 is preferably made of a polyester woven fabric similar to the curtain part 11. Further, as shown in FIG. 7, the length of the apron curtain 45 in the direction perpendicular to the connecting portion with the lower end portion of the curtain portion 11 is the water intake at the dam 104 along the water bottom 103 from the bottom of the pollution control film 10. An extension distance to the mouth 105 is preferable. By providing the apron curtain 45 having such a length, it is possible to prevent the clay particles 102 from floating again and flowing out of the water intake port 105.

  A plurality of narrow second reinforcing belts 15 extending in the vertical direction are preferably provided on the front surface side and / or the back surface side of the intermediate portion of the apron curtain 45, and the second reinforcing belt 15 is provided on the second reinforcing belt 15. It is preferable to provide an auxiliary weight 16 for settlement. The subsidizing auxiliary weight 16 is also preferably covered with the curtain bag 17. Thus, by providing the second reinforcing belt 15 and providing the sinking auxiliary weight 16, the strength of the apron curtain 45 is increased, and the apron curtain 45 sinks along the bottom 103 and prevents the apron curtain 45 from floating. Can do. Furthermore, when the pollution control device 1 is installed, there is a possibility that the low-layer clay floating mud may resurface due to the change in the water flow. By attaching the apron curtain 45 to the lower end of the pollution prevention film 10, clay particles 102 can be contained and re-levitation can be prevented.

  It is preferable that the adjacent pollution prevention film | membrane 10, the float cover 21, and the apron curtain 45 are connected by the connection wrap part 50 provided in the both ends of the longitudinal direction. As shown in FIGS. 1A, 1C, 6 and 8, the connection wrap portion 50 is adjacent to the first reinforcing belt 14 and the connection belt 51 extending along the adjacent vertical direction, and the adjacent tension belt 40. It is preferable that the first reinforcing belt 14 extending along the longitudinal direction or the second reinforcing belt 15 extending along the adjacent longitudinal direction and the connection fitting 55 are included.

  Two adjacent first reinforcing belts 14 extending in the vertical direction are provided in parallel at predetermined intervals along the left and right side edges of the antifouling film 10, and each first reinforcing belt 14 is further provided. A plurality of holes are formed in the central portion on the belt 14 at predetermined intervals in the vertical direction. And the connection wrap part 50 of the adjacent pollution prevention apparatus 1 is piled up, the two such 1st reinforcement belts 14 are made to adjoin each other, and the connection belt which consists of polyester in the hole provided on the reinforcement belt 14 is provided. By bundling through 51, the pollution control device 1 can be connected. In this way, when the connection belt 51 is detached by overlapping the connection wrap portions 50 and overlapping them, the clay particles 102 flow out through the gap between the connection wrap portions 50. Can be prevented.

  Further, the adjacent pollution prevention device 1 is further provided at each end of the tension belt 40, the first reinforcing belt 14 extending along the longitudinal direction, and / or the second reinforcing belt 15 extending along the longitudinal direction. It is preferable that the connection fitting 55 is also connected. The connection fitting 55 is configured by attaching a shackle 57 to the D pipe 56, and firmly connects the adjacent pollution prevention devices 1.

  In the method of installing the pollution control device 1 of the present invention, first, the anchor 60 is installed on both banks 106 of the reservoir 100, and the pollution control device 1 in which the pollution control film 10 is temporarily bound with a rope is placed on the water surface. Next, as shown in FIG. 9, both ends of the float cover 21 of the float unit 20 are fixed to the anchor 60, the temporarily bound rope is cut off, and the pollution prevention film 10 is attached to its own weight, weight, and auxiliary weight for subsidence. It is preferable to install by sinking with a weight. Moreover, as shown in FIG.4 and FIG.5, since the float part 20 descend | falls as the water level falls, it is preferable to fold and install the float part 20. FIG. Since it can be installed in this way, large construction is not required and construction can be performed at low cost and in a short time.

  When the apron curtain 45 is provided in the pollution prevention device 1, first, the apron curtain 45 is attached to the pollution prevention film 10 on land, and further, a small float is attached to the apron curtain 45 to prevent settlement during installation work. . Next, only the pollution prevention film 10 is temporarily bundled with a rope, and then the apron curtain 45 attached with a small float is temporarily bundled together with the pollution prevention film 10 with a rope. And it is preferable to put the pollution prevention apparatus 1 of such a state in the water surface, and to start installation of the pollution prevention apparatus 1. Both ends of the float cover 21 are fixed to the anchor 60, and the rope that temporarily binds the apron curtain 45 is cut off. In a state where the apron curtain 45 is floated on the water surface by a small float attached earlier, the lower edge of the apron curtain 45 is drawn to the levee body and fixed to the dam body with a predetermined interval using a small pile. Next, the small float of the apron curtain 45 is removed, the rope that temporarily binds the pollution prevention film 10 alone is cut off, and the pollution prevention film 10 and the apron curtain 45 are weighted by their own weight, weight, and the weight of the subsidence weight. It is preferable to install as shown in FIG. Since it can install in this way, even when the apron curtain 45 is provided, construction can be performed at a low cost and in a short time.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used as a pollution control device capable of selectively taking surface water in a reservoir such as a dam lake or a reservoir.

DESCRIPTION OF SYMBOLS 1: Pollution prevention apparatus, 10: Pollution prevention film | membrane, 11: Curtain part, 12: Surface layer opening part, 13: Opening, 14: 1st reinforcement belt, 15: 2nd reinforcement belt, 16: Auxiliary weight for subsidence , 17: curtain bag, 20: float part, 21: float cover, 22: float, 30: weight, 40: tension belt, 45: apron curtain, 50: connection wrap part, 51: connection belt, 55: connection fitting 56: D pipe, 57: Shackle, 60: Anchor, 100: Reservoir, 101: Surface water, 102: Clay particles, 103: Water bottom, 104: Dam, 105: Water intake, 106: Shore.

Claims (7)

A float that floats on water,
On the float part, a pollution prevention film suspended via a tension belt,
A weight attached to the lower end of the pollution control film,
With
A pollution control apparatus comprising a surface layer opening through which surface layer water can circulate in the pollution control film or the float part, and an impermeable curtain part under the surface layer opening.   The pollution control device according to claim 1, wherein the surface layer opening is a net.   The pollution control device according to claim 1 or 2, wherein a first surface of the tension belt is attached to an upper end of the pollution control film, and a second surface of the tension belt is attached to an outer peripheral surface of the float portion.   The pollution prevention apparatus as described in any one of Claims 1-3 which provided the auxiliary weight for subsidence which prevents the bending of the said pollution prevention film | membrane on any one surface of the surface side of the said curtain part, and a back surface side.   The pollution control device according to any one of claims 1 to 4, wherein the sinking auxiliary weight is provided on a reinforcing belt extending in a direction substantially parallel to the float portion.   The pollution control device according to claim 4 or 5, wherein the sinking auxiliary weight is a chain.   The pollution control apparatus as described in any one of Claims 1-6 which has a water-impermeable apron curtain arrange | positioned along the water bottom at the lower end part of the said pollution control film | membrane.

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