JP3532039B2 - Method and apparatus for preventing diffusion of polluted water during landfill work - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, when the earth and sand slurry was discharged through a pipe, there was a problem that a large amount of pollution 20 was generated as shown in (1) of 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 (2) of the figure. In this polluted water diffusion prevention frame 22, a sheet-shaped silt protector 24 was suspended from the floating frame 23 to the vicinity of the seabed to suppress the diffusion of polluted water.

[0003]

However, since the polluted water diffusion preventive frame as described above covers a wide area around the discharge port, the equipment becomes large and it is not possible to easily move it during construction. In addition, when there is a wave or tidal current, there is a drawback that the silt protector rises and the effect of preventing the spread of polluted water decreases.

The present invention has been made in view of the above problems, and an object thereof is to facilitate movement during construction without the effect of preventing the diffusion of polluted water in discharging slurry from being affected by waves and tidal currents. It is an object of the present invention to provide a method for preventing the spread of polluted water and a device for preventing the spread of polluted water.

[0005]

[Means for Solving the Problems] A means for solving the above problems is a method for preventing the diffusion of polluted water , in which a large space having only a bottom opening and an injection pipe and a drain pipe on the upper surface is provided.
By landing a sand removal box having a space on the bottom of the water, by injecting the slurry from the injection pipe into a large space in the sand removal box ,
Its injection flow rate abruptly reduced along with precipitate deposited sediment in the slurry and is sludge water particles do not precipitate is mixed from the sediment box be drained by the drain pipe. Also, the polluted water diffusion prevention device opens only on the bottom,
Has a large space with a collar piece on the outer circumference of the bottom opening
A steel sand drain box , an injection pipe for injecting a slurry attached to the upper surface of the sand drain box , a drain pipe for discharging polluted water, and a hanging rope. The injection
Bend the pipe and drain pipe in any direction with respect to the sand box.
It is formed freely .

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a first embodiment of a polluted water diffusion preventive device 1, in which only a bottom surface of a steel sand discharge box 2 is opened, and a collar piece 3 is provided on the entire outer circumference of the bottom surface. The 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, and this is connected to a slurry delivery pipe 5.

The injection pipe 4 is rotatably mounted,
In addition, it is formed to be bendable in any direction. A drain pipe 6 is provided on the upper surface of the sand discharge box 2 for sucking up and discharging polluted water generated when the earth and sand slurry is injected into the sand discharge box 2, which is connected to a polluted water delivery pipe 7. There is. This drain pipe 6 is also rotatably attached like the above-mentioned injection pipe 4 and is formed so as to be bendable in an arbitrary direction.

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

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

At this time, a slurry delivery pipe 5 is connected to the injection pipe 4 to deliver the dredging slurry from a dredger (not shown), and a drain pipe 6 is connected to a polluted water delivery pipe 7. The polluted water is delivered from the sand discharge box to the turbid water treatment facility (not shown).

When the polluted water diffusion preventive device 1 is bottomed at a predetermined position, as shown in FIG. 3, the dredging slurry flows from the dredging ship through the slurry delivery pipe 5 and the injection pipe 4 to the sand discharging box 2.
Injected inside.

Since the dredging slurry injected into the sand discharge box 2 is discharged from the injection pipe 4 into a large space, the flow velocity is drastically reduced. Thus, when the flow velocity is drastically reduced and becomes equal to or lower than the sedimentation limit flow velocity of the soil particles, the sediment 10 in the dredging slurry starts to settle and accumulates on the bottom surface of the water in the sand discharge box 2, and the unprecipitated fine particles are generated. Mixed polluted water 11
Is discharged from the drainage pipe 6 and delivered to the turbid water treatment facility via the polluted water delivery pipe 7.

At this time, since the earth and sand 10 is accumulated inside the sand discharge box 2 and is shielded from the outside, the polluted water 11 does not leak to the outside. And the dredging slurry is the sand removal box 2
When the sand 10 is poured into the inside and accumulated to a 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, the hook 9 of the crane is hooked on the hoisting rope 8 to hoist the polluted water diffusion preventing device 1. When the polluted water diffusion preventive device 1 is lifted in this manner, the accumulated sediment 10 is discharged from the bottom of the sand discharge box by the weight of the water and becomes a bowl-shaped embankment 13.

Then, the polluted water diffusion preventive device 1 suspended next to the embankment 13 is set on the bottom, 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, which is the same as the first embodiment except that the collar piece 3 of the sand discharging box 2 is provided with a rubber tube packing 15. It has the same configuration as the polluted water diffusion prevention device 1 of the embodiment. Air or water is injected into the packing 15.

A polluted water diffusion preventing method using the polluted water diffusion preventing device 14 is also the same as that of the first embodiment. This contaminated water diffusion preventive device 14 is used when the unevenness of the water bottom is large, as shown in FIG. 2 Prevents it from leaking out.

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

FIG. 9 shows the third embodiment of the method for preventing the spread of polluted water. (1) uses two sets of the polluted water spread preventive apparatus 1 in combination, and the two sand discharge boxes 2 are dredged. The slurries are injected at the same time or alternately.

When the dredging slurry is injected into the sand discharge box 2 at the same time, the two injection switching valves 17 and 18 are set to the "open" state, and when the injection is completed, the two polluted water diffusion preventive devices 1 are simultaneously opened. Lift to bottom. By adopting such a method, the efficiency of the dredging work can be improved.

On the other hand, when the dredging slurry is alternately injected into the sand discharging box 2, the two injection switching valves 17 and 18 are alternately set to the "open" and "closed" states and the inside of the sand discharging box 2 is changed. When is filled with the accumulated sediment 10, the injection switching valve 17 that was “open” is closed, and the injection switching valve 18 that was “closed” is opened. Then, the slurry delivery pipe 5 and the polluted water delivery pipe 7 on the "closed" injection switching valve 18 side are removed, and then the polluted water diffusion prevention device 1 is lifted and moved. Efficient dredging work is performed by sequentially repeating such work.

Further, (2) in the same figure shows a method for preventing the spread of polluted water using a polluted water spread preventive device 19 in which a packing 15 made of a rubber tube (or sponge) is provided on the flange 3 of the sand discharging box 2. There is the same method as described above except that the packing 15 is provided. This is also used when the unevenness of the bottom surface of the water is large as in the above,
Since the water is closely attached to the sea bottom according to the unevenness, the polluted water can be prevented from flowing out of the sand discharge box 2, and an efficient dredging work can be performed.

[0023]

According to the method for preventing the diffusion of polluted water, a large size is provided in which only the bottom is opened and the top surface is provided with an injection pipe and a drain pipe.
The bottom of the sandbox with a special space is placed on the bottom of the water, and the slurry is injected from the injection pipe into the large space inside the sandbox .
Ri, the injection flow rate abruptly reduced along with precipitate deposited sediment in the slurry, by draining by the drain pipe and the precipitate was not sludge particles are mixed water from the sediment box, the diffusion of polluted water It can be surely prevented.

The sand discharging box detects that sediment of the injected slurry has settled and accumulated to reach a predetermined height, and the slurry is injected.
Since it can be lifted and moved after stopping , the dredging work can be performed smoothly.

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

[0026] In the polluted water diffusion prevention device, only the bottom surface is opened, a large Tsubahen is provided on the outer periphery of the bottom surface opening
And sediment box made of steel having a space, Installing the upper surface of the exhaust sandbox
It consists of an injection pipe for injecting the scraped slurry, a drain pipe for discharging polluted water, and a hanging rope.
The injection pipe and drain pipe can be placed in any direction with respect to the sand box.
Since it can be bent freely, it can land on the planned water bottom without being affected by waves and tidal currents.
It is possible to prevent the diffusion of polluted water.

Settling of the injected slurry inside the sand removal box
Since the level sensor that detects the deposition height is equipped, it is possible to stop the injection of the slurry.
Smooth pour work.

[0028] By having a packing to the lower surface of the flange pieces, since the sediment box can be brought into close contact with the water bottom, discharge
Surely prevent the outflow of polluted water to the outside of the sandbox.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional view in which a polluted water diffusion prevention device is bottomed.

FIG. 3 is a sectional view of a polluted water diffusion preventive device for injecting dredging slurry.

FIG. 4 is a cross-sectional view of a suspended pollution water diffusion preventing device.

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

FIG. 6 is a cross-sectional view of a polluted water diffusion preventive device provided with a rubber tube packing.

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

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

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

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

[Explanation of symbols]

1, 14, 19 Contaminated water diffusion prevention device 2 sand removal box 3 collar pieces 4 injection tubes 5 Slurry delivery pipe 6 drainage pipe 7 Contaminated water delivery pipe 8 rope 9 hooks 10 earth and sand 11 polluted water 12 level sensor 13 Embankment 15, 16 packing 17, 18 injection switching valve

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-1-116114 (JP, A) JP-A-6-306865 (JP, A) JP-A-4-165060 (JP, A) Actual Kaihei 4- 26231 (JP, U) Actual development Sho 58-153240 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02B 3/18 E02D 15/10

Claims (6)

(57) [Claims] 1. An injection pipe is provided only on the bottom and is opened on the top.
A sand discharge box having a large space with a drainage pipe is set on the bottom of the water, and the slurry is injected from the injection pipe into the large space in the sand discharge box to rapidly increase the injection flow velocity. causes lowers precipitate deposited sediment in the slurry, sludge water diffusion during landfill operations, characterized by draining the precipitated no fine sludge water which has been mixed from the sediment box by the discharge <br/> water tubes Prevention method. 2. The sand discharging box detects that the soil of the poured slurry has settled and accumulated to reach a predetermined height, and pouring the slurry.
The method for preventing sludge water diffusion at the time of landfill work according to claim 1, wherein the method is suspended and moved after stopping the filling. 3. The method for preventing sludge water diffusion during landfill operation according to claim 1 or 2, wherein a plurality of sand discharging boxes are bottomed, and the slurry is alternately or simultaneously injected into these bottoms. 4. A steel sand discharge box having a large space in which only a bottom surface is opened and a collar piece is provided on the outer periphery of the bottom surface opening .
An injection pipe for injecting a slurry attached to the upper surface of the sand discharging box, a drain pipe for discharging polluted water, and a hanging rope
And at least the inlet pipe and the drain pipe are the sand discharge
A sludge water diffusion preventing device, which is formed so as to be bendable in any direction with respect to a box . 5. Settling of the injected slurry into the sand discharge box
The polluted water diffusion preventive device according to claim 4, further comprising a level sensor for detecting the height of the accumulated sediment . 6. The polluted water diffusion preventive device according to claim 4, wherein a packing is provided on a lower surface of the collar piece.