JP4605461B2 - Pollution prevention membrane device - Google Patents

Description

  The present invention relates to a pollution control film device for preventing diffusion of pollutants generated in construction such as dredging and landfill in water.

  Conventionally, as described in Patent Document 1 and Patent Document 2, for example, this type of anti-pollution membrane device has a curtain suspended with a weight (weight chain) attached to a float floated on the water surface. In addition, the anti-contamination film is moored at a predetermined position by mooring means (a mooring line, an anchor, etc.).

By the way, in this kind of pollution prevention membrane device, naturally, the float descends according to the drop in the water level, and the curtain becomes loose. And in the sea area where the difference in tidal range is large, the slack generated in the curtain increases, and the curtain comes into frictional contact with the reefs on the bottom of the water, which causes the curtain to fray. Therefore, conventionally, as described in Patent Document 3, for example, an intermediate float is attached to an intermediate portion of the curtain, and measures are taken so that the lower portion of the curtain does not rub against the water bottom ground (friction contact).
JP-A-9-59967 JP 2001-226947 A JP 9-53222 A

  However, when the anti-pollution membrane device described above is installed on a reef (rock reef, coral reef, etc.), the top of the leaf reaches near the sea surface at low tide or is exposed on the sea surface. As a whole, it is in frictional contact with reefs and is affected by waves. In other words, when the antifouling film device is installed on the leaf, the above-described intermediate float is hardly useful as a measure for fraying, and a new fraying measure to replace it has been desired.

  The present invention has been made in view of the above-described conventional problems, and the object of the present invention is to provide a pollution control film device that does not cause the pollution prevention film to be worn out even when installed on a leaf. There is.

In order to solve the above-mentioned problems, the present invention provides a pollution prevention film formed by suspending a curtain with a weight attached to a lower part of a float floated on the water surface, a sheet-like material laid on the bottom of the water, and the pollution prevention. It is characterized by comprising a mooring means for positioning the membrane above the sheet-like material.
In the pollution prevention membrane device configured as described above, the pollution prevention membrane is placed on the sheet-like material as the water level decreases, so that the pollution prevention membrane does not come into direct frictional contact with the bottom reefs. As a result, the antifouling film is prevented from being worn out.

  In the present invention, a number of weight chains extending in the direction intersecting the laying direction of the sheet-like material are arranged on the upper surface of the sheet-like material at a predetermined pitch in the laying direction, and each weight chain and the sheet-like material are arranged. And may be connected to each other. In such a configuration, the sheet-like object is pressed by the load of the weight chain, so that the laying state of the sheet-like object is stabilized. In this case, both end portions of each weight chain may be connected to the anchor, whereby the laying state of the sheet-like material is further stabilized.

  In the present invention, the type of the sheet-like material is arbitrary, but it is desirable to use a wire mesh because it is easy to install and inexpensive in cost. In this case, as the wire mesh, it is desirable to select a rhombus wire mesh having higher shape followability.

  In the present invention, the curtain preferably has a triple structure in which both sides of the membrane main body are covered with a water-permeable civil engineering sheet. When the triple structure is used as described above, the strength of the curtain is increased, so that the resistance to fraying is further improved.

  According to the pollution control film device of the present invention, even if the water level is lowered, the pollution prevention film is not directly brought into frictional contact with the bottom rocks, so that the curtain and the float constituting the pollution prevention film may be worn out. This is eliminated, and it can be used stably on the leaf.

  In addition, when the curtain has a triple structure in which both surfaces of the film body are covered with a water-permeable civil engineering sheet, since the strength of the curtain itself is increased, the resistance to fraying is further improved.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 and FIG. 2 show the overall structure and installation state of a pollution control film device as one embodiment of the present invention. This pollution control membrane device is provided on a float 1 floating on the sea surface (water surface), a pollution prevention membrane 4 in which a curtain 3 having a weight chain (weight) 2 attached to the bottom is suspended, and a sea bottom (water bottom) G. A rhombus wire mesh (sheet-like material) 5 laid, fixing means 6 for fixing the rhombus metal mesh 5 to the seabed G, and mooring means 7 for positioning the anti-contamination film 4 above the rhombus metal mesh 5 are roughly constituted. .

  The antifouling film 4 is formed by connecting film units 10, 10... Manufactured in units of a predetermined span (for example, 20 m). As shown in FIGS. 3 and 4, the float 1 in each membrane unit 10 is formed by covering a floating body 11 made of polystyrene foam with a cover 12 made of synthetic fibers (for example, a two-layer structure of polyester and tarpaulin). It has become. The cover 12 is stitched together with tension belts 13 disposed on both sides of the mating portion, and a first connection belt 14 used for connection with the curtain 3 is also sewn into the stitched portion. ing. Moreover, the 2nd connection belt 15 used for the connection of the membrane units 10 is sewn into the both ends of the float 1. FIG.

  As shown in FIG. 5, the curtain 3 in each membrane unit 10 is covered here with water-permeable civil engineering sheets 21, 21 on both sides of a synthetic fiber (for example, polyester) antifouling membrane 20. It has a triple structure. The film body 20 and the two civil engineering sheets 21 constituting the curtain 3 are sewn together with reinforcing belts 22 and 22 arranged on both sides along the outer peripheral edge of the mating portion. 6 and FIG. 7, the first connection belt 23 used for connection to the float 1, the second connection belt 24 used for connection between the membrane units 10, and the weight chain 2 are used. A third connecting belt 25 used for attaching the second connecting belt 25 is sewn. As shown in FIG. 3, the entire curtain 3 is sewn at a longitudinal reinforcing belt 26 sewn at a plurality of locations in the longitudinal direction (here, 3 locations) and an intermediate portion at the height thereof. It is also reinforced by the lateral reinforcement belt 27.

  In the pollution prevention film 4, the float 1 and the curtain 3 are mutually connected by a first connecting rope 30 passed through the first connecting belt 14 on the float 1 side and the first connecting belt 23 on the curtain 3 side. (FIG. 4). Further, each membrane unit 10 is connected by a second connecting rope 31 passed through the second connecting belts 15 on the float 1 side and the second connecting belts 24 on the curtain 3 side (FIG. 6). . Further, the weight chain 2 is attached to the curtain 3 by a third connecting rope 32 that passes through the third connecting belt 25 on the curtain 3 side (FIG. 7). Each membrane unit 10 is provided on the curtain 3 with the reinforcing belts 33 sewn on the upper side of both ends of the float 1, between the reinforcing belts 34 sewn on both ends of the tension belt 13 on the float 1 side. The lateral reinforcing belts 27 are also connected to each other by being connected by connecting tools (shackles) 35, 36, and 37, respectively.

  On the other hand, in the rhombus metal mesh 5 as the sheet-like material, as shown in FIGS. 8 and 9, a plurality of (in this case, three) metal meshes 40 having a specified width are connected to each other. It has become. More specifically, the wire mesh unit 40 includes a vertical connection wire 42 sewn along a mutual lap portion (seam portion) 41 overlapped at a predetermined lap allowance (for example, 100 mm), and the wrap portion 41. They are connected to each other by a large number of transverse connecting wires 43 sewn at right angles. The horizontal connecting wires 43 are arranged at a predetermined pitch in the direction in which the rhombus metal mesh 5 is laid. By sewing the large number of horizontal connecting wires 43, the rhombus metal mesh 5 becomes substantially a single piece, and the seam portion. The bending from 41 is prevented.

  The fixing means 6 for fixing the diamond wire mesh 5 to the seabed G is mounted on the upper surface of the diamond wire mesh 5 so as to extend in a direction perpendicular to the laying direction and to be arranged at a predetermined pitch in the laying direction. A large number of row weight chains 45, anchors 46 arranged on both sides of the diamond wire mesh 5 and installed on the seabed G, connecting both ends of each row weight chain 45, and columns placed along both sides of the diamond wire mesh 5 It consists of a weight chain 47. In the present embodiment, each row weight chain 45 is disposed adjacent to the horizontal connection wire 43 sewn into the rhombus metal mesh 5, and between the weight chain 45 and the rhombus metal mesh 5, the horizontal connection wire 43. Are connected to each other. Further, the column weight chain 47 and the rhombus metal mesh 5 are directly connected using an appropriate connector (not shown). Here, the anchor 46 is configured as a 3-ton anchor.

  Further, the mooring means 7 for positioning the antifouling film 4 above the rhombus 5 is connected to a connector 36 (FIG. 4) for connecting the reinforcing belts 34 sewn to the tension belt 13 on the float 1 side. Are connected to a mooring line (anchor rope) 48, and anchors 49 arranged on both sides of the diamond wire mesh 5 and installed on the seabed G to connect the other end of the mooring line 48. The mooring means 7 composed of the mooring line 48 and the anchor 49 is arranged corresponding to the joint of the membrane unit 10 of the antifouling film 4, and the anchor 49 fixes the weight chain 45 constituting the fixing means 6. It is commonly used as an anchor (46). The anchor 49 is configured as a 6-ton anchor as an example.

  In order to install the pollution prevention membrane device configured as described above, the float 1 and the curtain 3 and the curtain 3 and the weight chain 2 are connected to each other in advance on the land, so that the pollution prevention membrane 4 in the span unit (membrane unit). 10) Prepare the required number of sheets. Further, a plurality of wire nets 40 are connected to each other by vertical connection wires 42 and horizontal connection wires 43 to prepare a required number of rhombus metal nets 5 having a predetermined width and a predetermined length. First, the diamond wire mesh 5 is lifted and laid on the seabed G by a crane operation from a trolley or a coast. At this time, the rhombus wire mesh 5 is in a state close to a single piece by the connection by the vertical connection wires 42 and the horizontal connection wires 43, and smoothly sinks to the seabed while maintaining the developed state. Moreover, the rhombus metal mesh 5 has a lower rigidity and better shape followability than, for example, a turtle shell metal mesh, and is laid to follow the unevenness of the seabed G. At this time, if necessary, the subassembly bodies are connected to each other to extend the laying length of the rhombus metal mesh 5. Next, the row weight chain 45 and the column weight chain 47 are attached to the diamond wire mesh 5 laid on the seabed G by underwater work.

  Next, the necessary number of anchors 46 (49) are sequentially installed on both sides of the diamond wire mesh 5 laid on the seabed G, and both ends of the horizontal weight chain 45 on the diamond wire mesh 5 are attached to each anchor 46 (49) by underwater work. To fix the position of the diamond wire mesh 5 to the seabed G. Next, the pollution prevention membrane 4 is suspended in the sea by the same crane operation as described above, and at this time, the membrane units 10 are connected to each other as necessary to extend the installation length. Thereafter, the other end of the mooring cable 48 having one end connected to the connector 36 (FIG. 4) at both ends of the membrane unit 10 is connected to the corresponding anchor 49, and the antifouling film 4 is connected to the center of the diamond wire mesh 5. It is moored (fixed in position) along the line, and the installation of the pollution control membrane device is completed.

  In the pollution prevention film device installed as described above, when the float 1 descends in accordance with a decrease in the tide level (water level), the curtain 3 gradually sags, and the curtain 3 swings due to the influence of waves. However, since the diamond wire mesh 5 exists under the pollution prevention film 4, the curtain 3 slides on the diamond wire mesh 5 without directly contacting friction with the reefs on the seabed, thereby preventing the curtain 3 from being worn out. The On the other hand, when the seabed G is the top of the reef, the reefs of the seabed G reach near the sea surface or are exposed on the sea surface at low tide. In this state, the pollution including the curtain 3 and the float 1 occurs. The entire prevention film 4 rests on the rhombus 5, so that the pollution prevention film does not come into direct frictional contact with the rocks on the bottom of the water, and as a result, the curtain 3 and the float 1 are prevented from being worn out.

It is a perspective view showing typically the whole structure and installation state of a pollution prevention membrane device as one embodiment of the present invention. It is a front view which shows the whole structure and installation state of this pollution prevention film apparatus. It is a side view which shows the whole structure of the pollution prevention film | membrane which comprises this pollution prevention film apparatus. It is a perspective view which shows the connection structure of the float and curtain which comprise this pollution prevention film | membrane, and the connection structure of pollution prevention films | membranes (film | membrane unit). It is a schematic diagram which shows the cross-section of the curtain which comprises this pollution prevention film. It is a side view which shows the connection structure of the curtains which comprise a pollution prevention film | membrane (film | membrane unit). It is a side view which shows the connection structure of the curtain and weight chain (weight) which comprise this pollution prevention film. It is a top view which shows the rhombus metal mesh (sheet-like object) which comprises this pollution prevention film apparatus, and the fixing means which fixes a rhombus metal mesh to the seabed. It is sectional drawing which shows the integrated structure of a rhombus metal mesh which comprises this pollution prevention film apparatus.

Explanation of symbols

1 Float 2 Weight chain (weight)
3 Curtain 4 Pollution prevention film 5 Diamond wire mesh (sheet-like material)
6 Fixing means for diamond wire mesh 7 Anchoring means for anti-pollution film 20 Film body 21 Civil engineering sheet 42 Vertical connecting wire 43 Horizontal connecting wire 45 Weight chain 46 Anchor 48 Mooring line 49 Anchor for anchoring

Claims (6)

  A pollution control film formed by hanging a curtain with a weight attached to the bottom of a float floated on the water surface, a sheet-like material laid on the bottom of the water, and the pollution control film are positioned above the sheet-like material. An anti-pollution membrane device comprising a mooring means.   A number of weight chains extending in the direction intersecting the laying direction of the sheet-like material are arranged on the upper surface of the sheet-like material at a predetermined pitch in the laying direction, and each weight chain and the sheet-like material are connected to each other. The pollution control film device according to claim 1 characterized by things.   The pollution control film device according to claim 2, wherein both end portions of each weight chain are connected to an anchor.   The pollution control film device according to any one of claims 1 to 3, wherein the sheet-like material is a wire mesh.   The anti-contamination membrane device according to claim 4, wherein the wire mesh is a diamond wire mesh. The pollution control film device according to any one of claims 1 to 5, wherein the curtain has a triple structure in which both sides of the pollution prevention film body are covered with a water-permeable civil engineering sheet.

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