JPH1046552A - Method and device for preventing diffusion of polluted water during landfill work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polluted water diffusion preventing method and a polluted water diffusion preventing device in which the effect of preventing polluted water diffusion in discharging slurry is not affected by waves and tidal currents, and which can be easily moved during construction. It is. SOLUTION: A sand discharge box 2 having only a bottom opening is settled on the bottom of the water, a slurry is injected into the sand discharge box 2, sediment 10 is deposited therein, and the polluted water 11 is discharged into the sand discharge box. 2 to drain water from inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for preventing the diffusion of polluted water during a landfill operation.

[0002]

2. Description of the Related Art Conventionally, when earth and sand slurry is discharged through a pipe, there is a problem that a large amount of pollution 20 is generated as shown in FIG. Therefore, in order to solve this, a polluted water diffusion prevention frame 22 is provided around the discharge port of the pipe 21 as shown in FIG. In this polluted water diffusion prevention frame 22, a sheet-shaped silt protector 24 is suspended from the raised frame body 23 to the vicinity of the sea floor to suppress the diffusion of the polluted water.

[0003]

However, since the above-mentioned polluted water diffusion prevention frame covers a wide area around the discharge port, the equipment is large-scale and cannot be easily moved during construction. Further, when there is a wave or a tide, there is a disadvantage that the silt protector soars and the effect of preventing the diffusion of polluted water is reduced.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to make it easy to move during construction without disturbing the diffusion of polluted water due to waves and tidal currents in discharging the slurry. It is an object of the present invention to provide a method and apparatus for preventing the diffusion of polluted water.

[0005]

Means for solving the above problems are as follows. A method for preventing the diffusion of polluted water is to settle a sandbox having only a bottom opening on the bottom of the water and to place the sandbox in the sandbox. Injecting the slurry, sedimenting and depositing the slurry therein, and discharging the polluted water from the sand discharge box. Further, the pollution water diffusion preventing device has an opening only at the bottom surface of the sand discharge box, a flange piece on the outer periphery of the bottom surface, an injection pipe for injecting slurry on an upper surface of the sand discharge box, and a sand discharge It is equipped with a discharge pipe for discharging polluted water in the box.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a first embodiment of a polluted water diffusion prevention device 1 in which only a bottom surface of a steel sand box 2 is open, and a flange piece 3 is provided on the entire outer surface of the bottom surface. An upper surface of the sand discharge box 2 is closed, and an injection pipe 4 for injecting earth and sand slurry such as dredging slurry into the sand discharge box 2 is provided on the upper surface thereof, and this is connected to a slurry delivery pipe 5.

The injection tube 4 is rotatably mounted,
And it is formed so as to be freely bendable in any direction. A drain pipe 6 for sucking up and discharging polluted water generated when the earth and sand slurry is injected into the sand dump box 2 is provided on the upper surface of the sand dump box 2 and connected to a polluted water delivery pipe 7. I have. This drain pipe 6 is also rotatably attached similarly to the above-mentioned injection pipe 4, and is formed to be freely bendable in any direction.

Further, a rope 8 for lifting is connected to the upper surface of the sand discharge box 2 so that the rope 8 can be hooked on a hook 9 and moved by a crane. As described above, in the polluted water diffusion prevention device 1, since the sand discharge box 2 is made of steel, it is not affected by waves or tidal currents even when it reaches the water bottom.

A method for preventing the diffusion of polluted water using the apparatus 1 for preventing the diffusion of polluted water will be described with reference to FIGS. First, as shown in FIG. 2, the pollution water diffusion prevention device 1 is lifted by a crane and landed at a predetermined position.

At this time, a slurry delivery pipe 5 is connected to the injection pipe 4 so as to deliver dredged slurry from a dredger (not shown), and a drainage pipe 6 is connected to a polluted water delivery pipe 7. The contaminated water is delivered from a sandbox to a turbid water treatment facility (not shown).

When the contaminated water diffusion prevention device 1 is settled at a predetermined position, as shown in FIG. 3, the dredged slurry is discharged from the dredger via a slurry delivery pipe 5 and an injection pipe 4 to a sand discharge box 2.
Injected into.

The dredged slurry injected into the sand discharge box 2 is discharged from the injection pipe 4 into a large space, so that the flow velocity is rapidly reduced. When the flow velocity is rapidly reduced and becomes equal to or lower than the sedimentation limit flow velocity of the soil particles, the sediment 10 in the dredged slurry starts to settle and accumulates on the water bottom surface in the sand discharge box 2, and fine particles that do not sediment Mixed polluted water 11
Is discharged from a drain pipe 6 and delivered to a turbid water treatment facility via a polluted water delivery pipe 7.

At this time, since the sand 10 is deposited on the inside of the sand discharge box 2 and is blocked from the outside, the polluted water 11 does not leak to the outside. And the dredged slurry is discharged
When it is poured into the soil and the soil 10 accumulates to the predetermined height,
This is detected by the level sensor 12, and the injection of the dredging slurry is stopped.

Then, as shown in FIG. 4, a hook 9 of a crane is hooked on a lifting rope 8 to lift the pollution water diffusion preventing device 1. When the polluted water diffusion prevention device 1 is lifted in this way, the sediment 10 is discharged from the bottom of the sandbox by the weight of the underwater, and becomes a bowl-shaped embankment 13.

Then, the soil water diffusion prevention device 1 suspended next to the embankment 13 is landed, and the same operation as described above is repeated to continuously form the embankment 10 as shown in FIG.

FIG. 6 shows a second embodiment of the polluted water diffusion preventing device 14 according to the first embodiment except that a packing 15 made of a rubber tube is provided on the flange 3 of the sand discharge box 2. It is the same configuration as the polluted water diffusion prevention device 1 of the embodiment. The packing 15 is filled with air or water.

The method for preventing the diffusion of polluted water using the apparatus 14 for preventing the diffusion of polluted water is the same as that of the first embodiment. This polluted water diffusion prevention device 14 is used when the unevenness of the water bottom is large as shown in FIG. 7. 2 Prevents spillage.

FIG. 8 shows that a packing 16 made of sponge is provided in place of the packing 15 made of rubber tube. The method for preventing the diffusion of polluted water using the device 14 for preventing the diffusion of polluted water is the same as that described above. Is the way.

FIG. 9 shows a third embodiment of a method for preventing the diffusion of polluted water. (1) shows a method of using two polluted water diffusion prevention devices 1 in combination, and dredging in these two sand discharge boxes 2. The slurries are injected simultaneously or alternately.

When the dredging slurry is simultaneously injected into the sand discharge box 2, the two injection switching valves 17 and 18 are opened, and when the injection is completed, the two polluted water diffusion prevention devices 1 are simultaneously operated. Lift up and land. With such a method, the efficiency of the dredging operation can be improved.

On the other hand, when the dredging slurry is to be alternately injected into the sand discharging box 2, the two injection switching valves 17, 18 are alternately set to “open” and “closed”. Is filled with the sediment 10, the “open” injection switching valve 17 is “closed” and the “closed” injection switching valve 18 is “open”. Then, after removing the slurry delivery pipe 5 and the contaminated water delivery pipe 7 on the side of the injection switching valve 18 which has been closed, the contaminated water diffusion prevention device 1 is lifted and moved. An efficient dredging operation is performed by sequentially repeating such operations.

FIG. 2B shows a method for preventing the diffusion of contaminated water using a contaminated water diffusion preventing device 19 in which a packing 15 made of a rubber tube (or made of sponge) is provided on the flange piece 3 of the sand discharge box 2. There is a method similar to that described above, except that such a packing 15 is provided. This is also used in the case where the unevenness of the water bottom is large, as in the above case.
By contacting with the sea bottom according to the unevenness, it is possible to prevent the polluted water from flowing out of the sand discharge box 2 and to perform an efficient dredging operation.

[0023]

According to the present invention, a sandbox having only a bottom opening is settled on the bottom of the water, slurry is poured into the sandbox to deposit sediment therein, and polluted water is drained from the sandbox. By doing so, the diffusion of the polluted water can be reliably prevented.

When the sediment has settled to a predetermined height, the sand discharge box can be lifted and moved, so that the dredging operation can be performed smoothly.

A plurality of sand discharging boxes are settled, and the slurry is injected simultaneously or alternately into the sand discharging boxes, so that the dredging operation can be efficiently performed.

Only the bottom surface of the sandbox is opened, a flange piece is provided on the outer periphery of the bottom surface, an injection pipe for injecting slurry is provided on the upper surface of the sandbox, and the contaminated water in the sandbox is provided on the upper surface. By providing the drainage pipe for discharging, the diffusion of polluted water due to waves and tides can be prevented.

Since the packing is provided on the lower surface of the flange piece, the sand discharging box can be brought into close contact with the water bottom surface.

Since the packing is a sponge or a rubber tube, the sponge or the rubber tube adheres to the sponge or the rubber tube accordingly even if the water bottom has a large unevenness, so that the outflow of the contaminated water out of the sand box can be surely prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view of a pollution water diffusion prevention device.

FIG. 2 is a cross-sectional view showing a state in which a pollution water diffusion prevention device is landed.

FIG. 3 is a cross-sectional view of a pollution water diffusion preventing device for injecting dredging slurry.

FIG. 4 is a cross-sectional view of the suspended polluted water diffusion prevention device.

FIG. 5 is a cross-sectional view of the embankment.

FIG. 6 is a sectional view of a pollution water diffusion preventing device provided with a rubber tube packing.

FIG. 7 is a cross-sectional view in which a polluted water diffusion prevention device provided with a rubber tube packing is settled.

FIG. 8 is a sectional view of a polluted water diffusion prevention device provided with a sponge packing.

FIGS. 9 (1) and (2) are cross-sectional views of a method for preventing pollution water diffusion using two pollution water diffusion prevention devices.

FIGS. 10 (1) and (2) are perspective views of a conventional polluted water diffusion prevention method and a polluted water diffusion prevention device.

[Explanation of symbols]

 1, 14, 19 Pollution water diffusion prevention device 2 Sandbox 3 Flange piece 4 Injection pipe 5 Slurry delivery pipe 6 Drain pipe 7 Pollution water delivery pipe 8 Rope 9 Hook 10 Earth and sand 11 Polluted water 12 Level sensor 13 Filling 15, 16 Packing 17, 18 Injection switching valve

Claims (6)

[Claims] 1. A sandbox having only an open bottom surface is settled on the bottom of the water, a slurry is injected into the sandbox, sediment is deposited therein, and polluted water is drained from the sandbox. A method for preventing the diffusion of polluted water during landfill work. 2. The method as claimed in claim 1, wherein the sand box is lifted and moved when the sediment has settled to a predetermined height. 3. The method according to claim 1, wherein a plurality of the sand discharge boxes are settled, and the slurry is alternately or simultaneously injected into these sand discharge boxes. 4. A sand discharge box having only a bottom surface opened, a flange piece provided on an outer periphery of the bottom surface, an injection pipe for injecting slurry into an upper surface of the sand discharge box, and contamination in the sand discharge box on the upper surface. A pollution water diffusion prevention device comprising a discharge pipe for discharging water. 5. The pollution water diffusion preventing device according to claim 4, wherein a packing is provided on a lower surface of the collar piece. 6. The pollution water diffusion preventing device according to claim 5, wherein the packing is a sponge or a rubber tube.