JP2014095231A - Turbidity prevention membrane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a turbidity prevention membrane which is high in quality and excellent in durability.SOLUTION: A turbidity prevention membrane 1 includes: a weight 10 installed at water bottom; a curtain 20 in which a bottom edge is attached to the weight 10; and a float 30 attached to a top edge of the curtain 20. The weight 10 has: a plurality of weight members 11, 11, ... that granular materials are filled in a bag body; and a cover member 12 collectively covering the plurality of the weight member 11, 11, ... . The plurality of weight members 11, 11, ... is arranged side by side in two rows along an extension direction of the curtain 20.

Description

  The present invention relates to a pollution control film.

In some cases, the work area is surrounded by a pollution prevention film for the purpose of preventing the spread of pollution caused by marine and underwater work.
As such a pollution prevention film, there is a self-supporting pollution prevention film in which a curtain is raised from the bottom of the water.

  The self-supporting antifouling membrane has a weight installed on the bottom of the water, a curtain with a lower end attached to the weight, and a float attached to the upper end of the curtain. Yes.

  It is common to use H-shaped steel for the weight of the self-supporting pollution control film. However, when there is unevenness in the ground of the bottom of the water, a gap is formed between the H-shaped steel and the bottom of the water, and there is a risk that the contamination will diffuse from this gap.

  Therefore, in Patent Document 1, a weight is attached to the lower end as an anti-contamination film that can be installed without forming a gap between the bottom of the water even when the bottom of the water is uneven. In addition, a self-supporting antifouling film configured to be able to follow the unevenness of the bottom of the water by allowing the curtain having a folding structure to be independent from the bottom of the water with a float is disclosed.

  In addition, as a weight, a so-called sandbag in which a bag is filled with granular materials such as sand and crushed stone may be used to prevent a gap from being formed between the bottom and the weight.

JP 2010-189892 A

  The self-supporting pollution control film described in Patent Document 1 has a configuration in which the curtain is directly erected from the bottom of the water, so that the contact portion with the bottom of the curtain may be damaged due to waves and tide levels. When the curtain is damaged, the shielding function as a pollution prevention film may be lowered.

Further, even when a sandbag is used as the weight, there is a risk that the sandbag may be damaged at the contact portion between the water bottom and the sandbag, or at the contact portion between the curtain and the sandbag.
In addition, sandbags may roll due to waves

  This invention is made | formed in view of such a problem, and is providing the antifouling film | membrane excellent in durability with high quality.

  An antifouling film of the present invention for solving the above problems comprises a weight installed on the bottom of the water, a curtain attached to the weight, and a float attached to the curtain. A plurality of weight members filled with granular material in the bag and a cover member that collectively covers the plurality of weight members, the plurality of weight members being arranged in two rows along the extending direction of the curtain It is characterized by being arranged.

According to such a pollution prevention film, since the weight is constituted by a bag body filled with granular material, even if there is unevenness in the bottom of the water, a gap is formed between the weight and the bottom of the water. Can be prevented.
Further, since the plurality of weight members are collectively covered with the cover sheet, it is possible to prevent the pollution from flowing out from the gaps between the weight members.

Moreover, since the weight member does not come into direct contact with the bottom of the water or the curtain, it has excellent durability.
Furthermore, since the plurality of weight members are arranged in two rows, the height of each weight member can be suppressed lower than in the case where the plurality of weight members are arranged in one row, so that the stability can be improved.

  In the pollution prevention film, durability may be further enhanced by laying a base sheet between the weight and the water bottom (ground) or laying a protective sheet on the upper surface of the weight member.

  If the pollution prevention film is provided with an auxiliary curtain that covers a lower part of the curtain and a part of the upper surface of the weight, the shielding property is further improved.

  When the curtain is configured by connecting a plurality of curtain members, by providing a joint sheet that covers the connecting portion between the curtain members, the outflow of contamination from the connecting portion between the curtain members is prevented. it can.

  If a drainage channel with a filter penetrating the curtain or the weight is formed, the difference in water head inside and outside the pollution control film is maintained even in a sea area where the tidal difference is large and the tide is fast, and stability is maintained. Is preserved.

  ADVANTAGE OF THE INVENTION According to this invention, the pollution prevention film | membrane excellent in the quality and durability can be provided.

It is a perspective view which shows the pollution prevention film | membrane which concerns on embodiment of this invention. It is sectional drawing which shows the pollution prevention film | membrane shown in FIG. (A) is a perspective view which shows the joint sheet | seat of a pollution prevention film | membrane, (b) is an enlarged view which shows a part of (a). (A)-(c) is sectional drawing which shows each construction step of a pollution prevention film.

The pollution prevention film 1 prevents the outflow of pollution generated with underwater construction to the outside of the construction area, and is disposed so as to surround the construction area.
As shown in FIG. 1, the pollution prevention film 1 according to the embodiment of the present invention includes a weight 10, a curtain 20, a float 30, and a water drainage path 40.

The weight 10 is installed on the water bottom G.
The weight 10 has a weight that does not move due to the waves and tidal currents acting on the curtain 20 and the buoyancy of the float 30.

  The weight 10 includes a plurality of weight members 11, 11,... And a cover member 12 that covers the plurality of weight members 11, 11,.

The plurality of weight members 11, 11,... Are arranged in two rows. The weight members 11, 11,... Are connected in the extending direction of the curtain 20 in each row.
One row is arranged outside the curtain 20 (opposite to the construction area), and the other row is arranged inside the curtain 20 (construction area side).

The weight member 11 is a so-called earthen pad configured by filling a bag with sand. The material of the bag is not limited.
Further, the material packed in the bag is not limited to sand, and may be other granular members such as gravel, gravel, and crushed stone. Moreover, you may use locally generated earth and sand as a filling material.

The weight member 11 prevents the weight 10 from rolling due to waves or the like by making the height smaller than the width and length.
In addition, although the shape dimension of the weight member 11 is not limited, in this embodiment, it is formed so that height may be about 50 cm.

As shown in FIG. 2, a protective sheet 13 is disposed on the upper surface of the weight member 11. The protective sheet 13 is laid under the curtain 20 and is fixed to the front and rear weight members 11, 11.
The protective sheet 13 prevents the curtain 20 or the jig 10 connecting the weight 10 and the curtain 20 from coming into contact with each other. That is, the protective sheet 13 is disposed so that the bag body of the weight member 11 is not torn.

The material of the protective sheet 13 is not limited as long as the weight member 11 can be protected, but may be formed of, for example, a nonwoven fabric.
The shape and size of the protective sheet 13 are not limited, but in the present embodiment, a sheet having a width of about 1 m and a thickness of about 1 mm is employed.

  The cover member 12 is a sheet material that collectively covers the weight members 11, 11,. The cover member 12 is connected to the curtain 20 on the upper side of the weight member 11 (upper side of the protective sheet 13 in this embodiment).

  The material constituting the cover member 12 is not limited as long as it covers the weight members 11, 11,... And can be fixed to the curtain 20. However, a material that prevents permeation of contamination is desirable.

The weight 10 is placed on a base sheet 50 laid on the water bottom G.
The base sheet 50 is a cushioning material that prevents breakage due to contact of the weight 10 with the bottom of the water, and is configured by a net sheet in the present embodiment.
In addition, the material which comprises the base sheet 50 is not limited.

  The base sheet 50 has a width (for example, 2 m) larger than the width of the weights 10 arranged in two rows, and even if the position of the weight 10 is slightly deviated for some reason, it is between the weight 10 and the water bottom. It is comprised so that it may be interposed.

  The curtain 20 shields the outflow of pollution, and as shown in FIG. 1, the upper end is attached to the float 30 and the lower end is attached to the weight 10.

  The curtain 20 is erected by the buoyancy of the float 30 and surrounds the construction area in a wall shape.

  The curtain 20 of the present embodiment is configured by connecting a plurality of curtain members 21, 21,.

  The curtain member 21 is a cloth-like material having a length capable of connecting the float 30 floating on the water surface and the weight 10 installed on the water bottom G, and is provided with a material incapable of permeating pollution. It is composed of materials.

As shown in FIG. 3A, the curtain members 21 are connected by bundling the ends with a bundling rope 22. In addition, the connection method of the curtain members 21 is not limited.
The connecting portion between the curtain members 21 is covered with the joint sheet 23, and contamination is prevented from penetrating from the gap between the curtain members 21.

  The joint sheet 23 is installed on the outer surface (surface opposite to the construction area side) of the pollution prevention film 1, the upper end thereof is located at the upper end of the curtain 20, and the lower end thereof is the upper end of the auxiliary curtain 24 described later. It has a length that becomes a lower position. In addition, the length of the joint sheet 23 is not limited to this, For example, you may have the same length as the curtain member 21 so that the connection part full extension may be covered.

  Although the material which comprises the joint sheet | seat 23 will not be limited if it can prevent permeation of pollution, in this embodiment, it comprises with the same kind of material as the curtain member 21.

  The joint sheet 23 has a width of about 20 cm, and as shown in FIG. 3B, both curtain members 21 are overlapped with the ends of the adjacent curtain members 21. , 21. In addition, the dimension of the joint sheet | seat 23 is not limited.

  Although the fixing method of the joint sheet 23 is not limited, in this embodiment, it fixes with the binding rope 22 which binds the curtain members 21 together.

  As shown in FIG. 2, the pollution prevention film 1 of this embodiment includes an auxiliary curtain 24 that covers a lower part of the curtain 20 and a part of the upper surface of the weight 10.

The auxiliary curtain 24 is a cloth-like material extending along the extending direction of the curtain 20, and is installed on the inner side surface (construction region side) of the pollution prevention film 1.
Although the material which comprises the auxiliary curtain 24 will not be limited if it can prevent permeation of pollution, in this embodiment, it comprises with the same kind of material as the curtain member 21.

  The auxiliary curtain 24 covers the joint between the weight 10 and the curtain 20, thereby preventing contamination from flowing out from the gap between the weight 10 and the curtain 20.

A weight chain 25 is mounted on a portion of the auxiliary curtain 24 positioned above the weight 10 to prevent a gap from being formed between the upper surface of the weight 10 and the auxiliary curtain 24.
An upper end portion of the auxiliary curtain 24 is fixed to an auxiliary float 31 installed at an intermediate portion of the curtain 20, and an upper portion of the auxiliary curtain 24 is overlapped with a lower portion of the curtain 20.

  Note that the weight chain 25 is not necessarily mounted on the lower end portion of the auxiliary curtain 24. For example, the auxiliary curtain 24 may be prevented from turning up by disposing another member instead of the weight chain 25, or the lower end portion of the auxiliary curtain 24 may be fixed to the upper surface of the weight 10. Further, the weight chain 25 may be fixed to the auxiliary curtain 24 in advance.

  As shown in FIG. 1, the float 30 is attached to the upper end of the curtain 20 and has a buoyancy capable of standing up in the water of the curtain 20.

The configuration of the float 30 is not limited, and may be, for example, a tube-like member into which gas is injected or a hollow plastic member.
Further, the shape and the number of the floats 30 are not limited.

In the present embodiment, auxiliary floats 31 are installed in the middle portion of the curtain 20 in the vertical direction.
Providing the auxiliary float 31 makes it possible to maintain the curtain 20 standing even when the water level drops due to low tide or the like. That is, even when the water level is lowered and the height of the float 30 is lowered, the curtain 20 is erected between the weight 10 and the auxiliary float 31 by the buoyancy of the auxiliary float 31.

  The auxiliary float 31 of the present embodiment is a member of the same quality as the float 30 and is configured by a member having a smaller cross section than the float 30.

As shown in FIG. 1, the water drainage channel 40 is a water channel that penetrates the weight 10. When the drainage channel 40 is provided, the inflow and outflow of water through the drainage channel 40 becomes possible, so that it is possible to reduce the flowing water pressure acting on the curtain 20 due to the tide (ebb tide or full tide).
A plurality of drainage paths 40 are formed at a predetermined interval with respect to the extending direction of the curtain 20.

  The drainage channel 40 of the present embodiment 51 includes a tube body 41 disposed so as to penetrate the weight 10 and a filter 42 provided inside the tube body 41.

The tubular body 41 passes through the weight 10 by being piped between the weight members 11, 11 adjacent to each other in the extending direction of the curtain 20.
The arrangement of the tube body 41 is not limited. For example, the pipe body 41 may be piped on the upper surface of the weight 10 to form the drainage path 40 that penetrates the curtain 20.

The material which comprises the pipe body 41 is not limited, For example, a concrete pipe, a polyvinyl chloride pipe | tube, a corrugated pipe | tube etc. should just be used.
In addition, the cross-sectional shape of the tube body 41 is preferably a rectangular cross-section from the viewpoint of preventing a gap from being formed with the weight member 11, but may be a circular cross-section or other polygonal cross-section. .

  The filter 42 is a member that prevents the outflow of pollution from the construction area. The configuration of the filter 42 is not limited.

  Next, the construction method of the pollution prevention film | membrane 1 of this embodiment is demonstrated.

  First, the base sheet 50 is laid on the bottom G along the location where the anti-pollution film 1 is formed, and the cover member 12 is laid on the upper surface of the base sheet 50 (see FIG. 4A).

  Next, the weight member 11 is suspended from the water by a crane (not shown) and placed on the upper surface of the cover member 12 in a row.

  When the weight members 11 are arranged in two rows, as shown in FIG. 4B, a protective sheet 13 is laid on the upper surface of the weight member 11, and both ends of the cover member 12 are attached to the weight members 11, 11 (protective sheet 13). Bundling on the top surface.

Subsequently, as shown in FIG. 4C, the curtain 20 is suspended in water, and the lower end of the curtain 20 is fixed to the end portion (binding portion) of the cover member 12.
The float 30 may be attached to the upper end of the curtain 20 in advance, or may be attached to the upper end of the curtain 20 after the curtain 20 is installed.

  The curtain members 21, 21,... Are previously bound on the ground. The joint sheet 23 and the auxiliary curtain 24 are also fixed to the curtain 20 in advance on the ground.

  The bundling of the curtain members 21 and the fixing of the joint sheet 23 and the auxiliary curtain 24 to the curtain 20 may be performed in water.

As mentioned above, the pollution prevention film 1 of this embodiment is excellent in high quality and durability. Specific effects are as follows.
Since the weight member 11 is composed of a bag body filled with granular material, even if the bottom G is uneven, the weight 10 and the bottom G are deformed appropriately according to the shape of the bottom G. It is possible to prevent a gap from being formed between them, and consequently, it is possible to prevent contamination from flowing out between the weight 10 and the water bottom G.

  Since the weight 10 is formed by the plurality of weight members 11, 11,..., The water bottom G can be followed even if it is severe.

  Since the plurality of weight members 11, 11,... Are collectively covered with the cover sheet 12, it is possible to prevent contamination from flowing out from the gaps between the weight members 11. Further, the plurality of weight members 11, 11,... Are integrated to improve stability.

  Since the protective sheet 13 is laid on the upper surface of the weight member 11, the bag body of the weight member 11 is prevented from being damaged by the curtain 20 or a jig for connecting the curtain and the weight 10, and the durability is excellent.

  Since the base sheet 50 is interposed between the weight 10 and the water bottom G, the weight 10 is not in direct contact with the water bottom G even when rocks or corals are protruding. Therefore, the weight member 11 is prevented from being damaged by coming into contact with the projection on the bottom of the water, and the durability is excellent.

  Since the plurality of weight members 11, 11,... Are arranged in two rows, the height of the weight 10 can be reduced compared to the case where the weights 10 having the same weight are formed by arranging them in one row. That is, the weight 10 having a width that is wide with respect to the height can be formed. As a result, the stability is improved, and the weight can be prevented from rolling due to waves or the like.

  Since the auxiliary curtain 24 covers the joint portion between the weight 10 and the curtain 20 along the extending direction of the curtain 20, contamination is prevented from flowing out from the gap between the weight 10 and the curtain 20.

  Since the connecting portion between the curtain members 21 is covered with the joint sheet 23, the outflow of contamination from the connecting portion is prevented.

  Since the drainage channel 40 with the filter 42 is formed at predetermined intervals, the water head difference between the inside and outside of the pollution control film 1 is maintained and stable even in a sea area where the tidal difference is large and the tide is fast. Sex is maintained.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and the above-described constituent elements can be appropriately changed without departing from the spirit of the present invention.
For example, the installation location of the pollution control film of the present invention is not limited to the outer periphery of the construction area for marine and underwater construction.

  The base sheet 50 may be disposed as necessary, and may be omitted when the bottom of the water is made of gravel or the like and the weight 10 is not likely to break due to contact with the bottom of the water. Further, the base sheet 50 is not necessarily laid for the entire extension of the pollution prevention film 1.

  If there is no possibility that the weight member 11 is damaged at the fixed position between the weight 10 and the curtain 20, the installation of the protective sheet 13 may be omitted.

  When there is no fear of the outflow of contamination from the joint portion between the curtain members or the joint portion between the weight and the curtain, the installation of the auxiliary curtain and the joint curtain may be omitted.

  The drainage channel may be installed as necessary, and when installing a pollution control film in a water area where there is no change in the water level or in a water area where the change in the water level is small, the installation of the drainage path may be omitted. .

DESCRIPTION OF SYMBOLS 1 Pollution prevention film 10 Weight 11 Weight member 12 Cover member 13 Protection sheet 20 Curtain 21 Curtain member 23 Joint sheet 24 Auxiliary curtain 30 Float 40 Drainage path 42 Filter 50 Base sheet

Claims (6)

A pollution control film comprising a weight installed on the bottom of the water, a curtain attached to the weight, and a float attached to the curtain,
The weight includes a plurality of weight members in which a bag is filled with a granular material;
A cover member that collectively covers the plurality of weight members,
The plurality of weight members are arranged in two rows along the extending direction of the curtain.   The pollution control film according to claim 1, wherein a base sheet is laid between the weight and the water bottom.   The pollution control film according to claim 1 or 2, wherein a protective sheet is laid on the upper surface of the weight member.   The pollution control film according to any one of claims 1 to 3, further comprising an auxiliary curtain that covers a lower portion of the curtain and a part of an upper surface of the weight. The curtain is configured by connecting a plurality of curtain members,
The contamination preventing film according to any one of claims 1 to 4, wherein a connecting portion between the curtain members is covered with a joint sheet.   The pollution control film according to any one of claims 1 to 5, wherein a water drainage path with a filter penetrating the curtain or the weight is formed.

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