JP2004068268A - Pollution control equipment during dredging work and pollution control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a pollution control curtain from being broken caused by being contacted with a grab or the like. <P>SOLUTION: This pollution control equipment is provided with a floating body 1 floating above a dredging work site, a pollution control curtain 2 hung down into the water in a state fitted to the floating body 1 and wound around, preventing pollution from running out to surroundings, a deflection preventive member 3 retaining a shape in the water of the pollution control curtain 2 by preventing the curtain 2 from deflecting or undulating to the inner peripheral side in the inner peripheral side position of the curtain 2, and a fitting member for fitting the deflection preventive member 3 to the floating body 1. It is preferable that the pollution control curtain 2 is closely attached to the deflection preventive member 3 by making use of negative pressure at the outer peripheral side of the deflection preventive member 3 brought in a permeation draining by using a member having a permeation draining property as the deflection preventive member 3. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a pollution control device and a pollution control method during a dredging operation. More specifically, the present invention is applicable to, for example, dredging of sediment or mud on the water bottom (or sea bottom) by a work boat such as a grab type dredger at the time of dredging work in harbor / airport work, river work, lake marsh work, dam work, etc. The present invention relates to an improvement of a pollution control device for preventing pollution of a water area (or sea area).
[0002]
[Prior art]
An anti-pollution device, which covers a dredging work area with an underwater curtain to prevent the outflow of pollutants, is used in a dredging operation using a grab dredger or the like (for example, see Patent Document 1).
[0003]
As a conventional pollution prevention device, for example, a floating body 101 having a floating body framed by a steel pipe or the like, and a film-like pollution which is attached to the outer periphery of the floating body 101 and droops into water (including the sea) to prevent the outflow of the pollution. 11 and 12 (see FIGS. 11 and 12), for example, the pollution prevention curtain 102 can be hoisted by a hoist 103 such as a winch on the floating body 101 (reference numeral 104 denotes a walkway, 105). Is a weight). Then, at the time of dredging work (construction) by the grab-type dredger 106, as shown in FIG. 13, the surroundings of the grab 107 that grasps the bottom of the water are covered with the pollution prevention curtain 102 dripping down into the water, and muddy water generated by the dredging work is removed. The pollution is prevented from flowing out to the surroundings.
[0004]
[Patent Document 1]
JP 2001-262553 A (FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in the pollution prevention device having the above-described configuration, the pollution prevention device bends by receiving a lateral external force due to, for example, a tide (including a convection force inside the pollution prevention curtain 102 generated when the grab 107 moves up and down in water). There is a problem that the bulging or undulating pollution prevention curtain 102 may be broken by contacting the grab 107 or the wire 108 hanging the grab 107 (see FIGS. 13 and 14). If such damage occurs, economic loss of the pollution control device itself, extension of the construction period due to the suspension of work and increase in construction costs will be caused, and pollution outflow will adversely affect the environment around the construction area. Problems arise. Furthermore, since careful operation and work by a skilled operator is required to prevent the grab 107 and the wire 108 from coming into contact with the pollution prevention curtain 102, the work efficiency is reduced, the construction capacity is reduced, and the operator is greatly affected. A heavy burden (see FIG. 14).
[0006]
Further, in order to prevent the pollution prevention curtain 102 from being bent, a plurality of chains are hung on the inside thereof, but the operation has been performed without any effect as it is conventionally. That is, even if several chains are hung, the pollution prevention curtain 102 may enter the inside from the gap between the chains. To prevent this, if the number of chains is increased, the weight increases by that much and the floating body The chain was not so suitable as a means for preventing the pollution prevention curtain 102 from bending, for example, because the size of the chain 101 had to be increased.
[0007]
Further, in order to exhibit the original effect of the pollution prevention curtain 102 of preventing the pollution outflow, it is necessary to extend the pollution prevention curtain 102 to the vicinity of the bottom of the water. In some cases, the work is performed in a state where pollutants are constantly flowing out (see FIG. 15).
[0008]
Then, an object of the present invention is to provide a pollution control device and a pollution control method at the time of dredging work which prevent a pollution control curtain from coming into contact with a glove or the like and being damaged.
[0009]
[Means for Solving the Problems]
In order to achieve this object, the present inventor paid attention to the structure of a conventional pollution control device in which a non-rigid pollution control curtain is suspended from a floating body. In the past, the bulging of the pollution control curtain was given up as a natural phenomenon, and it was only necessary to consider how to work so that grabs and wires do not hit the pollution control curtain in the bulging area. As a result of examining this point, they came to find an effective means for preventing the bulging and swelling of the pollution prevention curtain.
[0010]
The invention of the present application is based on such knowledge, and the pollution prevention device at the time of dredging work according to claim 1 includes a floating body floating above a dredging work area, and a drowning body which is attached to the floating body and hangs down in water in a circling state. A pollution control curtain for preventing pollution during the dredging work from flowing out to the surroundings, and a pollution control curtain located on the inner peripheral side of the pollution control curtain to prevent the pollution control curtain from bending or swelling to the inner peripheral side. And a mounting member for mounting the bending prevention member to the floating body.
[0011]
In the method for preventing pollution during dredging according to claim 4, a pollution prevention curtain is attached to a floating body having a floating body structure, and is suspended in water in a state of being circulated to prevent turbidity from flowing out during dredging work, and a deflection preventing member is provided. The present invention is characterized in that the underwater shape of the anti-pollution curtain is maintained by being positioned on the inner peripheral side of the anti-pollution curtain and preventing the anti-pollution curtain from bending or undulating toward the inner peripheral side.
[0012]
In this pollution prevention device or the pollution prevention method, the deflection preventing member located on the inner peripheral side of the pollution prevention curtain prevents the pollution preventing curtain from bending or undulating on the inner peripheral side. For this reason, even if the pollution prevention curtain receives an external force in the lateral direction due to, for example, a tide, it does not flow toward the inner circumference side than the deflection preventing member, and does not come into contact with the glove or the wire.
[0013]
Further, in the pollution prevention device or the pollution prevention method, a member having permeation drainage property is used as the bending prevention member as described in claim 2 or 5, and a negative pressure on the outer peripheral side of the bending prevention member generated at the time of permeation drainage is used. Then, it is preferable that the pollution prevention curtain be brought into close contact with the deflection preventing member. In such a case, the anti-pollution curtain is prevented from flexing into the frame or expanding in the opposite direction, and the anti-pollution curtain during dredging work is prevented from being damaged by contact with the grab or wire. Further, by maintaining the underwater shape of the pollution prevention curtain, the operator can easily operate the grab. In this specification, the term “maintenance” is used. Means that the shape change (bending etc.) is suppressed.
[0014]
Further, in the pollution prevention device, it is preferable that a waste rubber belt is used as the bending prevention member. In such a case, the recycling of the used materials can be achieved, which can contribute to promotion of environmental preservation.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the configuration of the present invention will be described in detail based on an example of an embodiment shown in the drawings.
[0016]
1 to 8 show one embodiment of the present invention. A pollution prevention device for dredging work according to the present invention includes a floating body 1 floating above a dredging work area, a pollution prevention curtain 2 attached to the floating body 1, and a deflection prevention for maintaining the underwater shape of the pollution prevention curtain 2. A member 3 and an attachment member 13 for attaching the deflection preventing member 3 to the floating body 1 are provided. In addition, in order to make it easy to distinguish the pollution prevention curtain 2 and the deflection prevention member 3, in FIG. 1 to FIG. 3 and FIG.
[0017]
The floating body 1 is a means for supporting the anti-pollution curtain 2 which is hung in water. For example, a floating body which is a frame of a floating body framed by a steel pipe and which is floated above the dredging work area is a floating body. Used as 1. In the case of this embodiment, a rectangular frame formed by joining a plurality of cylindrical steel pipes as shown in FIG. 2 is used (see FIG. 1). As shown in FIG. 2, a walkway (platform) 8 having a plate-like cross section and having a substantially rectangular shape in a plan view is attached to an upper portion of the floating body 1. A winch (hoist) 7 for lifting and lowering the pollution prevention curtain 2 is provided at the upper part of the walkway 8. The winches 7 are arranged such that a plurality (for example, eight) of the winches 7 can support and lower the pollution prevention curtain 2 in a well-balanced manner. In addition, the floating body 1 is not limited to the one that circulates as shown here. For example, a plurality of divided floaters having sufficient buoyancy as a whole are arranged at equal intervals, and a walkway is placed on them. The floating body 1 may be a divided form in which the floating body 8 is placed.
[0018]
The pollution prevention curtain 2 is a film-like member that hangs in water in a circling state and prevents pollution during dredging work from flowing out around the work area. The anti-pollution curtain 2 is extended to the bottom of the water only when performing the dredging operation, surrounds the grab 11 at the dredging position, and confines the turbidity caused by the disturbance of the sediment of the underwater of the grab 11 accompanying the dredging operation into the curtain. To prevent pollutants from flowing out and to prevent surrounding water bodies from being polluted. The pollution prevention curtain 2 is lowered and extended by the winch 7 only during the dredging operation, and is rolled up to the corridor 8 on the floating body 1 (or near the water surface) when the dredging operation is not performed. The pollution prevention curtain 2 is attached to the outer periphery of the floating body 1 as shown in FIG. A weight 9 is attached to the lower end of the pollution prevention curtain 2 (see FIGS. 2 and 3).
[0019]
The deflection preventing member 3 is a member located on the inner peripheral side of the pollution prevention curtain 2 to prevent the contamination preventing curtain 2 from bending or undulating toward the inner peripheral side. In the present embodiment, a rubber belt (hereinafter, referred to as “rubber belt 3” in the present embodiment) that is inexpensive and less likely to damage the pollution prevention curtain 2 is used as the bending prevention member 3. It goes without saying that a new belt can be used as the rubber belt 3. For example, a waste rubber belt such as a belt conveyor in a mine can be used. In such a case, the materials used can be recycled and the environment can be promoted. Can contribute to
[0020]
The rubber belt 3 in the present embodiment has a vertically long band shape and is moderately hard and heavy, so that it can stand independently by its own weight to form a vertical plane. Are configured. The upper end side of the rubber belt 3 is attached to the floating body 1 (or the corridor 8) via, for example, an attachment member 13 in a state of being vertical in water as shown in FIG. A suitable length of the rubber belt 3 is a length (for example, about ３ to の of the water depth) suitable for effectively preventing the pollution prevention curtain 2 from bending or the like. The mounting member 13 is composed of an H-shaped steel material 4, a steel strip (flat bar) 5, a bolt 6, and a nut 12, which are fixed to the side of the floating body 1, as shown in FIG. The rubber belt 3 is fixed to the floating body 1 such that the rubber belt 3 is fastened from both sides with bolts 6 and nuts 12 with the upper end portion of the rubber belt 3 sandwiched between the steel 5.
[0021]
Further, in the present embodiment, a plurality of belt-shaped rubber belts 3 are arranged stepwise with a slight inclination so that adjacent belts 3 partially overlap each other (see FIG. 5). For this reason, the rubber belt 3 of the present embodiment has a permeated drainage property that allows water (seawater) to permeate from the overlapped portion.
[0022]
In the pollution control device having the configuration as in the present embodiment, the water between the pollution control curtain 2 and the rubber belt 3 causes the water pressure and the water pressure acting on the outside of the pollution control curtain 2 to pass through the gap between the overlapping portions. Due to the convective pressure of water generated inside the rubber belt 3 acting on the rubber belt 3 at the time of dredging, the water is permeated and drained to the inside of the deflection preventing member 3, and the suction adhesion effect between the pollution prevention curtain 2 and the rubber belt 3 due to natural physical phenomenon. Acts to bring the pollution prevention curtain 2 into close contact with the rubber belt 3. That is, as shown in FIGS. 4 and 5, an external pressure (indicated by (1) in FIG. 4) such as a tide from the outside of the pollution prevention curtain 2 and an internal pressure due to convection in the frame from the inside of the rubber belt 3 (see FIG. 4). 4, the water existing between the pollution control curtain 2 and the rubber belt 3 is transmitted through the rubber belt 3 or drained to the inside of the frame through the lower side of the rubber belt 3. (Indicated by {circle around (3)} in FIG. 4), the outer peripheral side of the rubber belt 3 (that is, between the anti-contamination curtain 2 and the rubber belt 3) has a negative pressure, and the non-rigid anti-contamination curtain 2 is sucked toward the rubber belt 3 side. Adhere (see FIG. 3). In this case, it is suppressed that the pollution prevention curtain 2 bends into the frame (that is, the inside of the dredging work area surrounded by the belt rubber 3) due to the tidal force or the like, or conversely expands outward. . For this reason, according to the pollution control device of the present embodiment, it is easy to suppress bending and undulation of the pollution control curtain 2 into the frame due to the tide, etc. 14 can be prevented from contacting. Further, when the operator operates the glove 11, the burden of preventing the operator from touching the pollution prevention curtain 2 can be reduced.
[0023]
The rubber belt 3 does not need to be specially made of a material, but may be a surface material made of, for example, a steel plate, a wooden plate, FRP, or the like as long as it can form a surface on which a suction adhesion effect can be expected. In this case, a large number of water-permeable holes are provided in this surface material so that water existing between the contamination prevention curtain 2 and the surface material in place of the rubber belt 3 can pass therethrough. An adhesion effect can be exhibited.
[0024]
When the belt-shaped rubber belts 3 are partially overlapped in such a manner, the upper ends of the rubber belts 3 are partially cut off in advance, so that the rubber belts 3 overlap with each other at the portion attached to the steel material 4. It is preferred that there are no parts. For example, when both corners on the upper end side of the rubber belt 3 are cut out to form a convex shape (see FIG. 8), most of the side portions of the rubber belt 3 are sandwiched between the steel material 4 and the band steel 5 while overlapping. The portions can be securely attached to the floating body 1 by preventing the portions from overlapping.
[0025]
When the above pollution control device is used, it is possible to perform the dredging work while preventing the outflow of the pollution (see FIG. 6). That is, the anti-pollution curtain 2 installed underwater so as to cover the dredging work area bends or swells into the frame by the anti-deflection member (rubber belt) 3 provided inside, and conversely expands outward. As a result, the shape in water is easily maintained even when an external force such as a tidal current is applied, so that there is very little possibility of the glove 11 or the wire 14 being damaged by contact with the glove 11 or the wire 14. Therefore, it is possible to reliably prevent the pollution from flowing out of the dredging work area. In addition, since the deflection and undulation of the pollution prevention curtain 2 are suppressed, the operator operating the grab 11 from the grab dredger 10 does not need to use more nerves than necessary to avoid contact, so that the burden is reduced. Become.
[0026]
The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. For example, in the present embodiment, the floating body 1 for supporting the pollution prevention curtain 2 is illustrated as a substantially rectangular one in a plan view (see FIG. 1), but this is merely an example of a shape, and this shape and the size are not limited. It goes without saying that it can be variously changed according to the conditions such as the contents of the dredging work and the size of the grab 11.
[0027]
Further, in the present embodiment, the rubber belts 3 are arranged stepwise with a slight inclination such that the adjacent belts 3 partially overlap each other. However, the rubber belts 3 are not overlapped with each other at the end portions. The adjacent portions may be arranged with a very small gap (see FIGS. 9 and 10). In such a case, the water existing between the anti-pollution curtain 2 and the rubber belt 3 is prevented from flowing from the very small gap at the belt-adjacent portion by the tidal pressure and water pressure acting on the outside of the anti-pollution curtain 2 and the deflection prevention acting on the deflection preventing member 3. Due to the convection pressure of the water at the time of dredging occurring inside the member 3, the water is permeated and drained inside the bending prevention member 3. When the rubber belts 3 are arranged with a gap as described above, the adjacent belts 3 are connected to each other by a connecting member 15 as shown in FIG. It is preferable to connect them. The connecting member 15 is not particularly limited as long as it can keep the rubber belt 3 fixed. For example, a chain, a wire rope, a fiber rope, or the like may be used as the connecting member 15 or fixed to the rubber belt 3 with an adhesive or a bolt. A rubber plate or the like may be used as the connecting member 15.
[0028]
【The invention's effect】
As is clear from the above description, according to the pollution prevention device for the dredging operation according to the first aspect, the pollution prevention curtain is placed inside the frame (that is, by the bending prevention member) by the bending prevention member installed inside the pollution prevention curtain. (Into the enclosed dredging work area) or conversely bulging outward. For this reason, even if an external force such as a tidal current is applied during the dredging work, the pollution prevention curtain can be prevented from coming into contact with the grab or the wire, and as a result, damage can be prevented. Loss of work stoppage due to damage and waiting for repair period is eliminated. Furthermore, since there is no breakage repair cost and high efficiency, the construction cost can be reduced and the construction period can be shortened. As described above, the efficiency of the dredging work and the effective prevention of the pollution outflow can be simultaneously achieved. In addition, since pollution of surrounding waters can be prevented, it is possible to contribute to the protection of aquatic landscapes, the protection of inhabiting organisms in waters, and the promotion of stable securing and propagation of marine resources, and thus the maintenance and promotion of human health. it can.
[0029]
In addition, since the operation of the pollution prevention curtain undulating into the frame can be prevented, an excessive burden on the operator who operates the grab can be reduced, and the working efficiency and the construction ability can be further improved. In addition, since the skill level required by the operator is eased, even a less skilled operator can operate.
[0030]
In addition, since the danger of the pollution prevention curtain coming into contact with the grab during the dredging operation is reduced, it is possible to reliably spread the pollution prevention curtain to the water bottom surface (or the vicinity thereof) without stopping the deployment. Therefore, the pollution can be confined in the curtain by completely covering the dredging work area, so that a higher pollution prevention effect can be obtained.
[0031]
In addition, the pollution control device according to the present invention does not need to be newly manufactured, but can be manufactured by adding a bending prevention member to the existing pollution control device, so that it can be installed extremely simply and at low cost.
[0032]
According to the pollution prevention device for dredging work according to claim 2, since the pollution prevention curtain can be brought into close contact with the deflection preventing member, the pollution prevention curtain subjected to an external force such as a tidal current bends into the frame. It is possible to more reliably prevent waviness and the like. Thereby, it is possible to more reliably prevent the pollution prevention curtain from coming into contact with the grab or the like during the dredging operation and being damaged.
[0033]
Further, according to the apparatus for preventing pollution at the time of dredging work according to the third aspect, the recycling of the used materials can be achieved, which can contribute to promotion of environmental conservation.
[0034]
According to the method for preventing pollution at the time of dredging work according to claim 4, the pollution prevention curtain can be prevented from coming into contact with the grab or the wire, and as a result, damage can be prevented. Since there is no loss such as stoppage or waiting for a repair period, it is possible to simultaneously achieve efficient dredging work and effective prevention of pollution outflow. In addition, since pollution of surrounding waters can be prevented, it is possible to contribute to the protection of aquatic landscapes, the protection of inhabiting organisms in waters, and the promotion of stable securing and propagation of marine resources, and thus the maintenance and promotion of human health. it can.
[0035]
In addition, since the operation of the pollution prevention curtain undulating into the frame can be prevented, an excessive burden on the operator who operates the grab can be reduced, and the working efficiency and the construction ability can be further improved. In addition, since the skill level required by the operator is eased, even a less skilled operator can operate.
[0036]
In addition, since the danger of the pollution prevention curtain coming into contact with the grab during the dredging operation is reduced, it is possible to reliably spread the pollution prevention curtain to the water bottom surface (or the vicinity thereof) without stopping the deployment. Therefore, the pollution can be confined in the curtain by completely covering the dredging work area, so that a higher pollution prevention effect can be obtained.
[0037]
According to the method for preventing pollution during dredging work according to claim 5, since the pollution prevention curtain can be brought into close contact with the deflection preventing member, the pollution prevention curtain subjected to an external force such as a tidal current is bent into the frame. It is possible to more reliably prevent waviness and the like. Thereby, it is possible to more reliably prevent the pollution prevention curtain from being damaged by contact with the grab or the like during the dredging operation.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of a pollution control device during a dredging operation according to an embodiment of the present invention.
FIG. 2 is a partial view showing the configuration of a floating body and its surroundings of the pollution control device in the present embodiment.
FIG. 3 is a cross-sectional view illustrating a suction adhesion state of both a pollution prevention curtain and a rubber belt of the pollution prevention device.
FIG. 4 is a view for explaining a drainage action by an external pressure such as a tidal current and an internal pressure such as a convection in a frame.
FIG. 5 is a plan view showing a suction adhesion state of both a pollution prevention curtain and a rubber belt of the pollution prevention device.
FIG. 6 is a diagram showing an example of a dredging operation by a grab dredger using a pollution control device.
FIG. 7 is a diagram showing a specific example of a mounting member in the present embodiment and a partially enlarged view thereof.
FIG. 8 is a view showing a form example of a rubber belt in which portions sandwiched between a steel material and a strip steel are prevented from overlapping.
FIG. 9 is a plan view showing a permeation and drainage action of a rubber belt and a suction adhesion state of a pollution prevention curtain and a rubber belt in another embodiment of the present invention.
FIG. 10 is a diagram showing a state in which adjacent rubber belts are joined by a joining member.
FIG. 11 is a schematic plan view showing an example of a conventional pollution control device.
FIG. 12 is a partial view showing a configuration example of a floating body of a conventional pollution control device and its surroundings.
FIG. 13 is a diagram showing a state at the time of a dredging operation by a glove type dredger using a conventional pollution control device.
FIG. 14 is another diagram showing a state during a dredging operation by a grab-type dredger using a conventional pollution control device.
FIG. 15 is still another view showing a state during a dredging operation by a grab-type dredger using the conventional pollution control device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Floating body 2 Pollution prevention curtain 3 Rubber belt (bending prevention member)
13 Mounting member

Claims (5)

A floating body floating above the dredging work area, a pollution prevention curtain attached to the floating body and hung down in the water in a circling state to prevent pollution during dredging work from flowing to the surroundings, and an inner periphery of the pollution prevention curtain Side of the anti-pollution curtain, which prevents the anti-pollution curtain from bending or undulating inward, thereby maintaining the underwater shape of the anti-pollution curtain, and an attachment for attaching the anti-pollution member to the floating body. A pollution control device for dredging work, comprising: A member having a permeation drainage property is used as the bending prevention member, and the pollution prevention curtain is brought into close contact with the bending prevention member by utilizing a negative pressure on the outer peripheral side of the bending prevention member generated at the time of permeation drainage. Item 7. A pollution control device for dredging according to Item 1. The pollution prevention device during dredging work according to claim 1 or 2, wherein a waste rubber belt is used as the bending prevention member. A pollution prevention curtain is attached to a floating body having a floating body structure, and is suspended in water in a state of being turned around to prevent turbidity from flowing out during dredging work, and a bending prevention member is located on the inner peripheral side of the pollution prevention curtain to prevent this pollution. A method for preventing pollution during dredging, characterized by maintaining the underwater shape of the pollution prevention curtain by preventing the curtain from bending or undulating inward. A member having a permeation drainage property is used as the bending prevention member, and the pollution prevention curtain is brought into close contact with the bending prevention member by utilizing a negative pressure on the outer peripheral side of the bending prevention member generated at the time of permeation drainage. Item 4. The method for preventing pollution during dredging work according to Item 4.

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