JP2003320335A - Sea surface waste disposal yard and management method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the improvement of landfill disposal efficiency and laying ease, the shortening of a laying period, the saving of a laying cost, and the like, by suppressing to a low level effects of a hydrostatic pressure due to a difference in the water level between the inside and the outside of an impervious structure, and the water pressure due to waves. <P>SOLUTION: The sea surface waste disposal yard utilizes an inner water area B closed by a sea wall 2 as a landfill disposal area 1 of waste, and has the impervious structures 8 and 10 including an impervious sheet laid on the sides and bottom face of the inner water area B. A submersible pump 12 and a water pressure sensor 13 are buried near the slope base of the sea wall 2. When the water pressure increases near the slope base of the sea wall 2 due to a rising tide level or wave effects in the outer water area, the submersible pump 12 is activated in accordance with a signal from the water pressure sensor 13 to forcibly discharge to the sea the brine which penetrates the sea wall 2, a sea bottom terrain 3, or the like gradually reaching the back of the impervious structures 8 and 10. Thus, the water pressure applied by the hydrostatic pressure and the wave force acting upon the impervious structures 8 and 10 is reduced to stabilize the structures 8 and 10. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sea surface waste disposal site for final disposal of industrial wastes, general wastes and the like on the sea surface and a management method therefor.

[0002]

2. Description of the Related Art In recent years, the amount of wastes, particularly industrial wastes, has become enormous, and various investigations have been made to find the final disposal site on the sea surface. FIG. 3 shows one form of this type of sea surface waste disposal site.
Inner water area B closed from outer water area (outer sea) A by revetment 2
It is set within. The revetment 2 is composed of a caisson type revetment here, and a caisson 5 installed on a rubble mound 4 formed on the seabed 3 and a backfill layer 6 formed by introducing a backfill stone behind the caisson 5. And a backing layer 6 and a belly layer 7 formed by filling landfill soil (mountain soil, mountain sand, slag, etc.). A double sheet structure (impermeable structure) in which impermeable sheets are doubly arranged on the back surface (slope) of the abdomen layer 7 forming the revetment 2, that is, the side surface of the inland water area B.
8 is installed, and on the bottom surface of the inner water area B, a composite structure (impermeable structure) 10 in which an impermeable sheet 8 ′ is superposed on the impermeable layer 9 is installed. In this case, the double sheet structure 8 on the side surface of the inner water area B has a composite structure of the bottom surface of the inner water area B due to the covering layer (slope surface covering layer) 11 formed by filling landfill soil or stone material behind it. The objects 10 are each stabilized by the same coating layer (bottom surface coating layer) 11 'as described above. In the sea surface landfill constructed in this way, the water level L ₁ of the inner water area B is managed to be equal to or slightly lower than the water level (average tide level) L _{0 of the} outer water area A. Even if the impermeable structures 8 and 10 are damaged, the contaminated water is prevented from flowing out to the outside water area A. In addition, when the seabed 3 is impermeable, the installation of the water-impervious structure on the bottom surface of the inner water area B may be omitted.

[0003]

By the way, the above-mentioned
According to the conventional sea surface waste disposal site, the rubble stones that make up the revetment 2
The mound 4 and the backing layer 6 have a considerable water permeability.
Therefore, the back surface of the double sheet structure 8 on the side surface of the inner water area B
Seawater has also infiltrated into the area, and the water level in the outer water area A is high when the tide is high.
If the water level rises, as shown in FIG.
Hydrostatic pressure P due to water level difference between inner water area B (inner and outer water level difference)_ABut
Acts on the double sheet structure 8. In addition, the seabed 3
In the case of highly permeable materials such as a gravel soil layer, internal water
The same applies to the back side of the composite structure 10 on the bottom of the area B as described above.
Hydrostatic pressure P due to outside water level difference_BWorks. On the other hand, outside water area A
If there are large waves in the water,
Pressure F _A, F_BIs the above-mentioned rubble mound 4, backfill layer 6 or seabed
Double sheet structure 8 or composite structure passing through the ground 3
Act on 10. That is, the double sea on the side of the inner water area B
To the structure 8 and the composite structure 10 on the bottom of the inner water area B
Is the hydrostatic pressure P due to the difference between the internal and external water levels._A, P_BAnd water pressure due to waves
F_A, F_BActs as a lifting pressure, which
The sheet structure 8 and the composite structure 10 float up.
Troubles such as damage. For this reason,
For the double sheet structure 8 on the side of the inner water area B,
To increase the load by thickening the covering layer 11 on it
On the other hand, the composite structure 10 on the bottom of the inner water area B
The impermeable layer 9 is thickened, and the bottom coating layer 11 is formed on it.
To deal with the above problems by thickening ´
Was. However, according to such measures, the coating layer 1
As 1, 11 'and the impermeable layer 9 become thicker, the landfill disposal area 1
The internal volume decreases, and the landfill disposal capacity of waste (landfill disposal effect
Inevitably a decrease in
It takes time and cost. In addition, water-impervious structure
For items 8 and 10, covering layers from the final deadline of the revetment 2
Until the construction of 11, 11 'is completed, that is, the completed cross section
Since it takes a considerable time until
Impermeable sheet 8'in heavy sheet structure 8 or composite structure 10
There is a risk that the coating layer will rise.
The measures to thicken ´ are not useful.

Incidentally, for example, in Japanese Patent Laid-Open Nos. 7-42130 and 2001-232322, a double wall structure consisting of a water-impervious inner wall and an outer wall is filled with a filling material to form a cut-off portion. None, there is a description of a sea surface waste disposal site that manages the water level in the deadline to prevent contaminated water in the landfill disposal area from leaking to the outside. Since the heavy wall structure itself functions as a water impermeable revetment, it is not necessary to install the double sheet structure 8 on the side surface of the inner water area B as described above. However, when the seabed 3 is the highly permeable gravel soil layer, as described above, the hydrostatic pressure P _B due to the water level difference between inside and outside and the wave on the back side of the composite structure 10 at the bottom of the inner water area B are described. The water pressure F _B (see FIG. 3) due to ## EQU1 ## still acts, and it is necessary to take measures to increase the thickness of the impermeable layer 9 of the composite structure 10 or the covering layer 11 'thereon.

The present invention has been made in view of the above-mentioned conventional technical background, and its object is to suppress the influence of the static water pressure due to the difference between the inner and outer water levels and the influence of the water pressure due to the waves on the water blocking structure. It is possible to improve the landfill disposal efficiency, improve the workability, shorten the construction period, reduce the construction cost, and provide a sea surface waste disposal site.
At the same time, it is to provide a management method for efficiently managing this sea surface waste disposal site.

[0006]

[Means for Solving the Problems] In order to solve the above problems, the sea surface waste disposal site according to the present invention is a sea surface waste disposal site in which the internal water area closed by a sea wall is used as a landfill disposal area for waste materials. At the side surface and / or the bottom surface of the inner water area, at a sea surface waste disposal site where a water impermeable structure including a water impermeable sheet is installed, the infiltration water from the outer water area is introduced into the soil on the back side of the water impermeable structure. It is characterized in that a pumping means for forcibly pumping water onto the water is provided. In the sea surface waste disposal site configured in this way, seawater that permeates the seawall, seabed, etc. and reaches the back side of the impermeable structure is forcibly discharged to the outside by the pumping means. The hydrostatic pressure acting on the impermeable structure and the water pressure due to wave force are significantly reduced.

In the marine waste disposal site of the present invention, even if the above-mentioned impermeable structure is a double sheet structure in which impermeable sheets are arranged in a double layer, it is a composite of impermeable sheets and impermeable layers. It may be a structure. In this case, the double sheet structure may have a two-layer structure in which two water-impervious sheets are superposed in a state of closely adhering to each other, but two water-impervious sheets are a nonwoven fabric, solidified soil, slag, etc. It may be a sandwich structure in which the intermediate layers are stacked. Further, the material of the impermeable layer constituting the composite structure is arbitrary, and it is possible to use not only concrete precast plates, concrete blocks, asphalt mats, asphalt mastics, but also underwater concrete, solidified soil, ground improvement soil, etc. You can In the marine waste disposal site of the present invention, the place where the above-mentioned water-impervious structure is installed depends on the structure of the seawall and the properties of the seabed ground. If the seawall and the seabed ground are permeable, the side surface of the inland water area If the seabed is impermeable and the revetment is water permeable on both the bottom and the bottom of the inland water, the revetment is impermeable and the seabed is permeable only on the side of the inner water. If so, water-impervious structures may be installed only on the bottom of the inland water area. On the other hand, the double sheet structure and the composite structure, if installed separately on any one of the side surface of the inner water area and the bottom surface of the inner water area, if necessary, the side surface of the inner water area and the inner water area bottom surface You may install in common to both.
In the marine waste disposal site of the present invention, the pumping point by the above-mentioned pumping means is preferably set in the vicinity of the slope of the revetment, whereby the seawater that permeates to the side surface of the inner water area and the bottom side of the inner water area is efficiently Can pump water. In this case, the pumping means is composed of the submersible pump and the pumping pipe, and the submersible pump is installed in the vicinity of the pumping point, whereby the pumping can be performed with high efficiency. In the marine waste disposal site of the present invention, a coating layer may be further formed on the water-impervious structure. In this case, the hydrostatic pressure acting on the above-mentioned water-impervious structure and the water pressure due to wave force are significantly reduced, so that the thickness of the coating layer can be reduced.

In order to solve the above-mentioned problems, the management method of a sea surface waste disposal site according to the present invention detects the water pressure in the soil on the back side of the water-impervious structure and operates the pumping means based on the detection result. It is characterized by By operating the submersible pump in accordance with the water pressure in this way, the pumping means can be operated only during high tide and during periods of high waves, and the operating cost can be reduced.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a sea surface waste disposal site as a first embodiment of the present invention. This sea surface waste disposal site uses the internal water area B closed by the caisson revetment 2 as a landfill disposal area for waste, and its overall structure is the same as that shown in FIG. 3 above. Here, the same parts as those shown in FIG.
Overlapping description will be omitted.

In the first embodiment, a submersible pump 12 and a water pressure sensor 13 are installed in the vicinity of the bottom of the abdomen layer 7 formed behind the backing layer 6 on the back side of the caisson 5. . The submersible pump 12 is connected to one end of a pumping pipe 14 and a signal line 15 extending in the belly layer 7, and the pumping pipe 14 and the signal line 15 are drawn to the upper surface of the revetment 2. On the upper surface side of the seawall 2, the pumping pipe 14
The other end of the signal line 15 is extended to a position facing the outside water area A, and the other end of the signal line 15 is connected to a control device (not shown). On the other hand, the water pressure sensor 13 has the same abdominal layer 7 as described above.
One end of the signal line 16 extending inside is connected, and the other end of the signal line 16 is connected to the control device. The submersible pump 12 and the pumping pipe 14 constitute a pumping means for forcibly discharging the permeated water that has passed through the rubble mound 4 and the backfill layer 6 from the external water area A to the sea.
The operation of No. 2 is controlled by the control device. The submersible pump 12 and the pressure sensor 13
Are arranged in the longitudinal direction of the seawall 2 at a predetermined pitch.

The construction method of this sea surface waste disposal site is basically the same as the conventional method. First, a rubble mound 4 is formed along a planned line on the seabed 3, and then a caisson 5 is placed on the rubble mound 4. After that, a backfill stone was placed behind the caisson 5 to form a backfill layer 6, and landfill soil was placed behind the backfill layer 6 to form a belly layer 7, as described above. Repeat the construction as needed to gradually extend the seawall 2.

When constructing the above-mentioned revetment 2, the submersible pump 12 and the pressure sensor 13 are provided on the surface layer of the seabed 3 near the slope of the abdominal layer 7 when the backing layer 6 is completed. Is installed, and the required pumping pipe 14 and signal lines 15 and 1 from these submersible pump 12 and pressure sensor 13 are installed.
Draw out 6 to the surface of the water. Then, the landfill soil for the belly layer 7 is put on the backfill layer 6, and when the landfill soil is deposited to a predetermined height, the pumping pipe 14 and the signal line 1 are formed on the slope.
5 and 16 are added together, and the landfill soil is further poured and deposited thereon to complete the belly layer 7, whereby the pumping pipe 14 and the signal lines 15 and 16 are buried in the belly layer 7 and a completed cross section. Become.

In constructing this sea surface waste disposal site, in parallel with the construction of the above-mentioned revetment 2, the above-mentioned impermeable sheet is provided on the slope of the belly layer 7 constituting the revetment 2, that is, the side surface of the inner water area B. The double sheet structure 8 arranged in double is installed on each of the composite structures 10 in which the impermeable layer 9 and the impermeable sheet 8 ′ are stacked on the bottom surface of the inner water area B partitioned by the revetment 2. In this way, construction of the seawall 2, double sheet structure 8
Installation and composite structure 10 installation in sequence, revetment 2
The final cutoff is performed, and the final installation of the double sheet structure 8 and the final composite installation of the composite structure 10 is completed. After that, double sheet structure 8 as a water-impervious structure
And, a coating material such as landfill soil or stone material is put on the composite structure 10 to thinly form the coating layers 11 and 11 ′, whereby the sea surface waste disposal site is completed.

The sea surface waste disposal site completed in this way is
The water level L ₁ in the inner water area B is controlled to be equal to or slightly lower than the average tide level L _{0 in the} outer water area A, and the water pressure monitoring by the water pressure sensor 13 is continued. Under this water pressure monitoring, if the water level in the outer water area A rises or a large wave occurs in the outer water area A at the time of high tide, etc.,
The water pressure near the slope of the seawall 2 increases, and this increase in water pressure is detected by the water pressure sensor 13. The signal of the water pressure sensor 13 is sent to the control device via the signal line 16.
When the water pressure detected by the water pressure sensor 13 becomes equal to or higher than a preset pressure, the control device outputs a start signal to the submersible pump 12 through the signal line 15, whereby the submersible pump 12 operates and the law of the bank 2 is activated. The seawater that permeates near the hips is discharged to the outside water area A through the pumping pipe 14. As a result, the hydrostatic pressure P _B due to the water level difference acting on the double sheet structure 8 on the side surface of the inner water area B and the composite structure 10 on the bottom surface of the inner water area B and the water pressure F _B due to the waves are significantly reduced. As a result, the double sheet structure 8 and the composite structure 10 are prevented from rising. That is, damage to the double sheet structure 8 and the composite structure 10 is prevented in advance,
Therefore, the sea surface waste disposal site will be maintained stably until the landfill disposal of the waste is completed. In other words, in addition to being able to make the slope coating layer 11 and the bottom coating layer 11 ′ for stabilizing the water-impervious structures 8 and 10 that have been conventionally required thinner than ever before (FIG. 3). The thickness of the impermeable layer 9 that composes the composite structure 10 can be reduced, and the landfill disposal efficiency of the landfill disposal area 1 can be improved accordingly, and the construction period and construction cost can be shortened. it can.

Incidentally, the hydraulic conductivity of the rubble mound 4, the backfill layer 6, the abdominal layer 7, and the seabed ground 3 are 1.0E + 0 cm /, respectively.
s, 1.0E + 0cm / s, 1.0E-3cm / s, 1.0E-1 ~ -2cm
/ s, and the maximum value of the water level difference between the inside and outside is 1.8 m, and the pressure head applied to the impermeable structures 8 and 10 is calculated by the osmotic flow analysis method, and the pumping rate is 10 to 100 liters / minute / m It became clear that it was 70 to 100% lower than the case. The level of the amount of pumped water is within a range that can be sufficiently achieved by using a general-purpose submersible pump, and it can be said that the present invention is extremely practical.

In the above first embodiment,
The double sheet structure 8 is installed on the side surface of the inner water area B, and the composite structure 10 is installed on the bottom surface of the inner water area B.
It is needless to say that both of them may be installed in the opposite arrangement, that is, the composite structure 10 may be installed on the side surface of the inner water area B and the double sheet structure 8 may be installed on the bottom surface of the inner water area B. Further, the double sheet structure 8 and the composite structure 10 may be installed in common on both the side surface and the bottom surface of the inner water area B without being properly used. The belly layer 7 is not always necessary. When the belly layer 7 is omitted, a double sheet structure 8 or a composite as a water-blocking structure is formed on the slope of the backing layer 6. The structure 10 will be installed. In addition, as a matter of course, in this case, the submersible pump 12 and the pressure sensor 13 are installed in the vicinity of the bottom of the backing layer 6.

FIG. 2 shows a sea surface waste disposal site as a second embodiment of the present invention. The feature of the second embodiment is that a filler 24 is contained in a double wall structure 23 in which an inner wall 21 and an outer wall 22 are arranged at an appropriate interval.
The impermeable wall 20 filled with is integrally provided behind the caisson revetment 2, and this impermeable wall 20 is used as a side surface of the inland water area B. The inner wall 21 and the outer wall 22 are constructed by continuously casting a steel sheet pile or a steel pipe sheet pile through a watertight joint here, and the entire impermeable wall 20 is
It has sufficient water impermeability. That is,
The revetment 2 is provided with the impermeable wall 20 on the back surface thereof,
As a whole, it functions as an impermeable revetment. Therefore, in the second embodiment, the double sheet structure 8 on the side surface of the inner water area B required in the first embodiment (see FIG. 1). ) Is unnecessary.

Here, the inner wall 21 of the double wall structure 23 is
The sheet pile used as the outer wall 22 and the outer wall 22 is embedded in the seabed 3, but when the seabed 3 is a highly permeable gravel soil layer, the seawater in the outer water area A permeates below the sheet pile. Then, it reaches the back surface side of the composite structure 10 on the bottom surface of the inner water area B. Therefore, in the second embodiment, the inner wall 21
In the seabed 3 behind the root and near the tip of the rooting,
The submersible pump 12 and the water pressure sensor 13 used in the first embodiment are installed, and the pumping pipe 1 required for them is installed.
4 and the signal lines 15 and 16 are drawn out along the inner wall 21 onto the seawall 2. .

In the second embodiment, the procedure for constructing the caisson revetment 2 is substantially the same as that in the first embodiment, and the backing layer 6 is behind the caisson 5 installed on the rubble mound 4. However, here, the impermeable wall 20 is constructed prior to the formation of the belly layer 7, and the impermeable wall 2 is formed.
The belly layer 7 is constructed during or after the construction of No. 0. When constructing the impermeable wall 20, a steel sheet pile or a steel pipe sheet pile is placed in the seabed ground 3 at a predetermined distance from the backfill layer 6 of the revetment 2 to the inner water area B side to form the inner wall 21 and the outer wall 22.
The double wall structure 23 having and is constructed, and then the filling material 24 is filled in the double wall structure 23. Filling material 24
As the material, a water-impermeable material such as solidified soil or cohesive soil can be used, or the landfill soil (mountain soil, mountain sand, slag, etc.) used for forming the belly layer 7 can be used as it is.
When the impermeable material is used as the filling material 24, after the completion of the construction of the impermeable wall 20 or according to the progress of the construction,
The landfill soil is charged between the impermeable wall 20 and the backfill layer 6,
The belly layer 7 is formed. On the other hand, when the landfill soil is used as the filling material 24, the landfill soil is placed between the outer wall 22 and the backfill layer 6 in parallel with the loading of the filling material 24 into the double wall structure 23. You may.

In this way, the impermeable revetment in which the impermeable wall 20 and the caisson type revetment 23 are integrated is completed. After completion, the seabed ground behind the inner wall 21 and near the rooting tip is completed. In FIG. 3, a submersible pump 12 and a water pressure sensor 13 are embedded, and a pumping pipe 14 and signal lines 15 and 16 necessary for them are installed along the inner wall 21. After that, a composite structure (impermeable structure) in which the impermeable layer 9 and the impermeable sheet 8 ′ described above are connected to the impermeable wall 20 on the bottom surface of the inner water area B partitioned by the revetment 2. ) 10 is installed, and a bottom surface coating layer 11 ′ similar to the above is thinly formed thereon, and the sea surface waste disposal site is completed.

After the sea surface waste disposal site is completed, as in the case of the first embodiment, the water level L ₁ in the inner water area B is equal to or slightly lower than the average tide level L _{0 in the} outer water area A. The water pressure monitoring by the water pressure sensor 13 is started at the same time. Under such water pressure monitoring,
Now, when the water level in the outer water area A rises or a large wave occurs in the outer water area A at high tide or the like, the water pressure near the rooting tip of the double wall structure 23 increases, and this water pressure increase is caused by the water pressure sensor 13. The submersible pump 12 is activated by a command from the control device in the same manner as in the first embodiment, whereby seawater that permeates near the rooting tip of the double-walled structure 23 passes through the pumping pipe 14 to the outside water area A. Is discharged to. As a result, the hydrostatic pressure P _B due to the water level difference acting on the bottom surface of the inner water area B and the water pressure F _B due to the waves (FIG. 3) are significantly reduced, and lifting of the composite structure 10 is prevented. As a result, the same effect as that of the first embodiment can be obtained.

In the present invention, the location of the submersible pump 12 constituting the pumping means is arbitrary, and the vicinity of the slope of the seawall 2 (first embodiment) or the tip of the root of the impermeable wall 23 is set. In addition to or instead of the vicinity (the second embodiment), it may be installed in another place. In addition, the submersible pump 12
Also, the water pressure sensor 13 may be installed through a conduit having a relatively large diameter provided in advance in the belly layer 7 (first embodiment) or the impermeable wall 20 (second embodiment). Good. In order to provide a pipe line in the impermeable wall 20, the pipe may be embedded in the filling material 24 in the double wall structure 23, but when a steel pipe sheet pile is used as the inner wall 21, the inside of the steel pipe sheet pile is When a steel sheet pile is used as the inner wall 21, a part of the steel sheet pile can be formed in a box shape and the inside can be used as a pipeline. Further, in each of the above embodiments,
Although the water pressure data detected by the water pressure sensor 13 installed in the vicinity of the submersible pump 12 is used for the operation management of the submersible pump 12, the present invention does not limit the data used for this operation management, and for example, the outside water area A It is also possible to provide a tide level sensor for detecting the tide level of and to use the tide level data detected by this tide level sensor for operation management of the submersible pump 12. Further, it goes without saying that the submersible pump 12 constituting the pumping means may be replaced with another pump having a water absorbing function.

[0023]

As described above, according to the sea surface waste treatment plant of the present invention, the difference between the internal and external water levels acting on the water-impervious structure is forcibly pumped from the back side of the water-impervious structure. Since the influence of hydrostatic pressure due to water and water pressure due to waves can be suppressed to a low level, the impermeable structure will be sufficiently stable without increasing the load on it or forming itself large, improving the landfill disposal efficiency, It is possible to improve the workability, shorten the construction period, and reduce the construction cost. Further, according to the management method for a sea surface waste treatment plant according to the present invention, it is not necessary to constantly operate the pumping means, so that the running cost can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view schematically showing a sea surface waste treatment plant as a first embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically showing a sea surface waste treatment plant as a second embodiment of the present invention.

FIG. 3 is a cross-sectional view schematically showing a conventional sea surface waste treatment plant.

[Explanation of symbols]

1 landfill disposal area 2 Caisson type revetment (permeable water revetment) 3 seabed 4 rubble mound 5 caisson 6 Backing layer 7 Belly layer 8 Double sheet structure (impermeable structure) 8'water impermeable sheet 9 Impermeable layer (impermeable structure) 10 Composite structure (impermeable structure) 11 Slope coating layer 11 'Bottom coating layer 12 Submersible pump (pumping means) 13 Water pressure sensor 14 Pumping pipe (pumping means) 20 impermeable walls 23 Double wall structure A outside water area B inner water area

Claims (6)

[Claims] 1. A sea surface waste disposal site in which an internal water area closed by a revetment is used as a landfill disposal area for waste, and a water-impervious structure including an impermeable sheet on the side surface and / or bottom surface of the internal water area is provided. A sea surface waste disposal site, wherein in the installed sea surface waste disposal site, a pumping means for forcibly pumping infiltrated water from the outside water area is provided in the soil on the back side of the impermeable structure. 2. The water-impervious structure is a double-sheet structure in which water-impervious sheets are arranged in double or a composite structure in which an impermeable layer and an impermeable layer are stacked. The listed marine waste disposal site. 3. The marine waste disposal site according to claim 1, wherein the pumping point by the pumping means is set near the hill on the back of the seawall. 4. The marine waste disposal site according to claim 3, wherein the pumping means comprises a submersible pump and a pumping pipe, and the submersible pump is installed near the pumping point. 5. The marine waste disposal site according to claim 1, wherein a covering layer is formed on the water-impervious structure. 6. The method for managing a sea surface disposal site according to claim 1, wherein the water pressure in the soil on the back side of the water blocking structure is detected, and based on the detection result. A construction management method for a sea surface waste disposal site, characterized by activating pumping means.