JPS5922848B2 - Water pollution prevention membrane - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water pollution prevention membrane used for preventing pollution diffusion in water bodies.

BACKGROUND ART Water pollution prevention membranes have conventionally been used to prevent seawater pollution caused by channel dredging, bed trenching, etc., and to prevent seawater pollution caused by earth and sand pushed into the sea during land reclamation work.

As shown in Figure 1, a pollution prevention membrane 2 is installed vertically at the lower end of a float 1, and an anchor wire 3 for fixing the upper part of the float 1 to prevent it from being washed away by currents, etc. and the pollution prevention membrane are stretched downward. The anchor wire 4 for fixing the lower part is fixed in a stretched state and is laid in a predetermined water area.

In the conventional water pollution prevention membrane shown in Fig. 1,
Because the float 1 exists on the water surface, it is susceptible to the effects of waves, wind, currents, etc. On the other hand, the lower 0 point is fixed in a relatively fixed position by the anchor, so the float 1 and the anti-pollution membrane 2
There is a problem in that damage often occurs at the point of contact A or point C along the way of the water pollution prevention membrane, and in order to prevent this damage during stormy weather, it is necessary to withdraw the water pollution prevention membrane.

Furthermore, even when installing a water pollution prevention membrane, the float 1 is susceptible to the effects of waves, lice, currents, etc., and the anchor wire for fixation must be stretched by a diver, depending on the weather conditions when installing it. was extremely limited.

Furthermore, in the case of a deep depth of 20 m or more, there is a drawback that it is difficult for a diver to set up the fixing anchor wire.

The present inventors focused on the fact that the drawbacks of conventional water pollution prevention membranes are due to the presence of floats and fixing anchor wires, and constructed water pollution prevention membranes by removing these. The present invention was completed as a result of intensive research in order to overcome the drawbacks, namely, the present invention consists of a bottom anchor that can be made to float by injecting air; This is a bottom-standing self-supporting water pollution prevention membrane characterized by comprising a buoyant pollution prevention membrane.

In other words, the entire water pollution prevention membrane is fixed to the bottom of the water using a bottom-mounted anchor, giving buoyancy to the pollution prevention membrane itself, which allows the membrane to be stretched upward, eliminating the need for a float floating on the water surface, and furthermore, By making the anchor floating by injecting air, the entire water pollution prevention membrane can float and sink, facilitating installation, removal, and towing.

Hereinafter, the present invention will be explained in more detail according to embodiments shown in the drawings.

2, 3, and 4 are schematic cross-sectional views showing the state in which the water pollution prevention membrane of the present invention is installed on the seabed.

In the embodiment shown in FIGS. 2 and 3, the water pollution prevention membrane is composed of a bottom anchor 10 and a pollution prevention membrane 11 which has its own buoyancy and is attached to the Q bottom anchor 10. The anchor 10 is constituted by a hollow tubular member, and the interior 12 is filled with seawater and sinks under its own weight on the seabed 13.

The pollution prevention membrane 11, which has buoyancy by itself, is partially constituted by a canvas area 15 having an air chamber 14 as shown in FIG. It extends to the water surface or from the seabed 13 to a predetermined depth.

The air chamber 14 is set within a range that provides sufficient buoyancy to stretch the membrane body 15 made of canvas upward and does not exceed the weight of the bottom anchor 10.

The one shown in FIG. 4 is another embodiment in which the bottom anchor is separated into a weight body 16 and an air injection buoyant body 17, and the weight body 16 of the bottom anchor and the pollution The preventive film 11 is swingably attached to the preventive film 11 by a hinge connection 18.

As a result, as shown in FIG. 5, the influence of tidal currents and the like can be avoided by the soft structure, and damage to the mounting portion or the membrane body can be prevented.

The embodiments shown in FIGS. 6, 7, and 8 are similar to the embodiment shown in FIG. 4, in which the bottom anchor is separated into a weight body 16 and an air injection buoyancy body 17. However, the bottom anchor and the pollution prevention membrane 11 are separably attached by a clip 19.

Therefore, when storing the water pollution prevention membrane after use, the membrane body can be rolled up and the bottom anchor can be stored separately as a rod-shaped body of a predetermined length, which has the advantage of not requiring extra storage area.

Next, methods for installing, removing, and towing the water pollution prevention membrane of the present invention will be explained.

First, when installing the water pollution prevention membrane of the present invention, the first
As shown in Fig. 3, air is injected by a near compressor into the bottom anchor 10, which is a hollow pipe constructed by connecting a sand discharge pipe with a diameter of 71 cIrL to a length of 100 m and providing discharge valves 20 at both ends. The membrane is floated and towed along with the anti-pollution membrane 11, which has its own buoyancy, to a predetermined water area.

When the cable reaches the installation water area, the discharge valve 20 is opened and the cable is thrown into the sea.

As a result, seawater enters the inside of the hollow tube, and the bottom anchor 10
gradually sank to the ocean floor, as shown in Figure 11.

Finally, it reaches the seabed 13, thereby completing the installation.

When the bottom anchor 10 reaches the seabed, the anti-pollution membrane 11 is fully extended upward by its own buoyancy and becomes the state shown in FIGS. 2 to 4, so that it can perform its function.

An example of the usage state is shown in FIG. 14.

In the usage example shown in Fig. 14, the dredging work area 2
3, another pollution prevention membrane 22 is vertically installed near the water surface from above the sea surface, and this prevents the spread of polluted water near the water surface during dredging work, and prevents it from being washed away along other areas near the sea bed. The water pollution prevention membrane 11 according to the present invention prevents polluted water from occurring.

In order to remove the water pollution prevention membrane of the present invention after use, the hanging wire 21 attached to the end is wound up and the end is pulled up to the sea as shown in FIG. The discharge valve is closed to prevent it from leaking, and a compressor is used to inject air into the bottom anchor, which is made of a hollow tube, to float the bottom anchor.

At this time, since the pollution prevention membrane 11 itself has buoyancy, it floats together with the bottom anchor floating.

The surfaced water pollution prevention membrane may be towed to the next installation water area or lifted onto a ship as necessary.

As explained above with reference to examples, the water pollution prevention membrane of the present invention can be installed and removed by work from a ship, and since it does not have a float floating on the water surface, it can be used even in stormy weather. In addition to being effective in making installation and removal work possible, it also has an excellent effect in eliminating problems such as damage at the junction between the float and membrane in conventional systems.

[Brief explanation of the drawing]

Figure 1 is a schematic cross-sectional view showing the state in which a conventional water pollution prevention membrane has been installed, and Figures 2, 3, 4, 5, and 8 show the installation of a water body pollution prevention membrane of the present invention. FIG. 6 is a front view of the same as shown in FIG. 8, FIG. 7 is a plan view of the same, FIG. 9 is a front view of another embodiment, and FIG.
The figures are the same side view Figure 11 is a schematic diagram showing the sinking method, Figure 12
The figure is a schematic diagram showing the levitation method, Fig. 13 is a schematic diagram showing the towing state, Fig. 14 is a schematic diagram showing the usage state, and explanation of symbols, 10...bottom anchor, 11...pollution prevention Membrane, 14... Air chamber, 16... Weight body, 19... Clip, 21... Hanging wire.

Claims (1)

[Scope of Claims] 1. A bottom-mounted tree stand type comprising a bottom-mounted anchor that can be floated by injecting air, and a pollution prevention membrane that is attached to the bottom-mounted anchor and has its own buoyancy. Water pollution prevention membrane. 2. The water pollution prevention membrane according to claim 1, wherein the bottom anchor and the pollution prevention membrane are swingably attached. 3. The water pollution prevention membrane according to claim 1 or 2, wherein the bottom anchor and the pollution prevention membrane are separably attached. 4. The anchor according to claim 1, 2 or 3, wherein the bottom anchor is made of a hollow tubular member, and is made to float by injecting air into the hollow tubular member. Water pollution prevention membrane. 5. The water pollution prevention membrane according to claim 1, 2 or 3, wherein the bottom anchor is separated into a weight body and an air injection buoyancy body. 6. The water pollution prevention membrane according to claim 12.3.4 or claim 5, characterized in that the pollution prevention membrane is made of a sheet having air chambers.