JP2002161523A - Caisson structure, caisson revetment and its construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caisson structure capable of receiving safely waste before the receiving zone is completely partitioned. SOLUTION: The caisson is provided with a bottom slab 11, external walls 12 erected from the vicinity of respective side edges of the bottom slab 11, and internal side walls 15 erected from the bottom slab 11 at the inside of the respective external side walls 12. The inside vacant space 14a surrounded by the internal side walls 15 is shaped as a waste storing space 14a in which waste is received.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a caisson structure and a method of constructing a caisson revetment and a caisson revetment. It is related to the construction method.

[0002]

2. Description of the Related Art Conventionally, in order to treat waste such as residues and incombustibles after incineration, it has been practiced to reclaim land near the coast and receive the waste there.
Such landfills may be either reclaimed in the sea to reclaim the area surrounded by the revetment, or reclaimed in the area surrounded by the coast and this revetment. Landfill areas need to be separated from the sea.
And this revetment is generally constructed by arranging so-called caisson in the sea.

[0005] For example, FIG. 15 is a diagram showing a structure of a caisson 10 used for the above-mentioned revetment. The caisson 10 includes a flat bottom plate 11 and a plurality of side walls 12 a to 12 erecting from the vicinity of each edge of the bottom plate 11.
d is a hollow box structure constructed by an outer wall 12 which is d and a buttress 13 which is a reinforcing plate provided between the outer wall 12 and the bottom plate 11 as necessary. The type of the caisson 10 includes a bottom plate 11 and an outer wall 12.
Depending on the material, there is a steel caisson made of a steel plate, a hybrid caisson in which steel is used as a basic skeleton and concrete is cast on the outside thereof, a concrete caisson made of reinforced concrete, and the like.

The caisson 10 is generally manufactured on land, and then suspended and towed by a floating crane or towed by a tug boat or the like while floating on the sea surface, and transported to a predetermined installation position on the sea. As shown in FIG. 16, the seabed 40 at the installation position is provided with ground maintenance to eliminate irregularities,
In order to stabilize the installation posture of the caisson 10, it is necessary to previously form a mound (pedestal) 50 having a flat surface on the seabed 40 on which the ground is maintained.

The weight of the caisson 10 is increased by pouring seawater or the like into the internal space 14 surrounded by the bottom plate 11 and the outer wall 12 of the caisson 10, and the caisson 10 is laid on the mound 50. If the caisson 10 cannot be accurately installed at the predetermined position, the caisson 10 can be easily lifted from the mound 50 by gradually draining the water in the interior 14 to the outside. Just try again.

[0006] Finally, after the caisson 10 is completely settled at a predetermined position on the mound 50, heavy objects such as earth and sand and gravel are poured into the internal space 14 filled with seawater or the like, so that the internal space 14 is filled. The seawater or the like in the space 14 overflows and is drained into the ocean, and the interior space 14 is filled with heavy materials such as earth and sand.
Is firmly deposited on the mound 50.

As described above, the caisson revetment 20 is constructed by arranging a large number of caissones 10 in the sea, and as shown in FIG. The area is buried as a waste receiving area 32.

The wastes that can be accepted in the waste receiving area 32 are mainly stable wastes, managed wastes, and impermeable (hazardous) wastes. It is waste.

In addition, under such regulations, various types of waste landfill seawalls are formed from the outer wall 12 of the caisson seawall 20 facing the waste receiving area 32 and the sea bottom 40.
A water-impervious sheet (not shown) is laid, a buffer material such as solidified soil is thickly piled on the water-impervious sheet, and a second water-impervious sheet covering the buffer material is laid thereover, and the waste receiving area 32 The leakage of the water itself or the water retained therein, which is a mixture of the water itself and the water retained by the waste and the seawater remaining in the waste receiving area 32, is strictly prevented.

[0010]

By the way, the construction period required for the entire revetment 20 to be completed, that is, the period required for the revetment 20 to partition the entire waste receiving area 32, is the same as that of the area 32. Although it depends on the size of the scale, it is generally about three years. Unless the waste receiving area 32 is completely surrounded by the revetment 20 and the construction of a water shielding work such as a predetermined water shielding sheet is completed, the waste cannot be received in the area 32. .

However, in recent years, the amount of waste discharged from ordinary households and businesses has increased sharply. Therefore, the reception of waste is started early without waiting for the start of receiving waste after the completion of the management type revetment. It is desired.

The present invention has been made in view of the above circumstances, and has a caisson structure and a caisson revetment capable of receiving waste safely from a time before completely partitioning a waste receiving area. And to provide caisson revetment construction methods.

[0013]

According to a first aspect of the present invention, there is provided a caisson structure comprising a bottom plate and a plurality of side walls rising from the vicinity of each edge of the bottom plate. In the structure of the caisson used for the receiving area partition seawall, of the plurality of side walls, at least inside the side wall facing the sea side, at a predetermined interval from the side wall facing the sea side, the plurality of side walls and the It is characterized by the fact that the inner wall that defines the interior space of the caisson surrounded by the bottom slab is constructed.

In the caisson of this configuration, an inner wall partitioning the inner space of the caisson is constructed inside a side wall facing the sea side while being arranged in the sea as seawalls.
The inner space of the caisson is divided into two parts, an inner space surrounded by a seaside side wall and an inner wall, and an inner space surrounded by an opposite side wall, that is, a side wall on the waste receiving area side and an inner bulkhead. Of the two internal spaces, the internal space far from the sea side faces the sea through the internal space on the sea side.

Therefore, even if the material (for example, waste itself) stored in the internal space far from the sea side or the material (for example, retained water) stored in this internal space leaks from the internal space, It either leaks into the interior space on the sea side or leaks into the waste receiving area, and in either case it does not leak directly into the sea and there is no risk of polluting the sea. Therefore, it is possible to store waste waiting to be received in the internal space far from the sea side, and to secure the waste safely in each caisson early before it is completed as a revetment that partitions the waste receiving area. Can be accepted. In the present invention, "sea side" means "the side opposite to the side facing the waste receiving area", and the same applies to the following inventions.

Further, by monitoring the waste and the retained water leaking into the inner space on the sea side, it is also possible to early find and confirm the defect of the inner wall and the deterioration of the durable performance. In the unlikely event that such a leak is found, repairs and reinforcements can be taken at an early stage, such as repairing the inner wall or installing a concrete or asphalt mixture in the seaside internal space. , Clay and the like are charged and the entire space is closed, whereby leakage from the internal space far from the sea side can be stopped at an early stage, and there is no risk of polluting the sea.

Also, by injecting and draining water into the inner space on the sea side, it is possible to adjust the draft according to the amount of waste housed. Therefore, ground improvement and mounding of the sea floor where the caisson will be installed is not yet completed. Even in the completed state, the amount of water injected can be adjusted and temporarily moored or temporarily placed at another place on the sea.

According to a second aspect of the invention, in the caisson structure according to the first aspect, the caisson structure is defined inside the plurality of side walls with a predetermined distance from each of the side walls. The inner wall is constructed.

In the caisson of this structure, the inner peripheral wall is formed inside the plurality of side walls, so that the inner peripheral wall is formed. Therefore, the entire caisson has a double wall (double hull) structure, and the inner space of the inner wall is formed. Outside, is formed a moat-shaped space surrounded by an inner wall and an outer wall.

Therefore, even if an object contained in the inner space of the inner wall leaks from the inner space, it only leaks into the outer moat-shaped inner space, and does not leak directly to the sea. There is no risk of polluting the sea. Therefore, it is possible to safely store the waste waiting to be received in the inner space of the inner wall, and to receive the waste safely in each caisson at an early stage before completion as a revetment partitioning the waste receiving area. be able to.

The inner space of the inner wall is double-walled over the entire circumference and is isolated from the sea. Therefore, even during temporary mooring or temporary storage where the entire outer wall faces the sea. In addition, the waste housed in the inner space of the inner wall can be safely managed.

Further, since a moat-shaped internal space is formed over the entire circumference on the outer side of the inner wall, when adjusting the draft by injecting / draining water from / into this moat-shaped internal space, how much water is injected is determined. Regardless, the floating and sinking can be adjusted in a well-balanced manner without tilting.

According to a third aspect of the present invention, there is provided a caisson structure according to the first or second aspect.
It is characterized in that an inner bottom slab that defines the interior space of the caisson is constructed inside the bottom slab at a predetermined interval from the bottom slab.

Since the caisson of this configuration has a double bottom structure, objects contained in the inner space surrounded by the inner bottom plate and the inner side wall leak from the bottom of the inner space (inner bottom plate). However, it only leaks into the space in contact with the outer bottom plate, does not leak directly into the sea, and has no risk of polluting the sea. Therefore, it is possible to safely store waste waiting to be received in the inner space of the inner wall, and before completion as a revetment separating the waste receiving area,
Each caisson can safely accept the waste.

According to a fourth aspect of the present invention, in the caisson structure according to any one of the first to third aspects, in the caisson structure in the caisson inner space partitioned by an inner wall, the caisson is located on the sea side. The internal space farther from the facing side wall is a waste storage chamber for storing the waste.

In the caisson of this configuration, the interior space on the far side from the side wall facing the sea side is a waste storage room for storing waste, so that the waste storage room has a side wall facing the sea side. Since the waste comes into the sea through the waste storage room, the waste stored in the waste storage room does not leak directly to the sea, and there is no risk of polluting the sea. In the present invention, the “inner space farther from the side wall facing the sea side” is, in the caisson in which the inner bottom slab is constructed, the inner space farther from the side wall facing the sea side. Means the internal space with the inner bottom slab as the bottom.

According to a fifth aspect of the present invention, in the caisson structure according to the fourth aspect, in the caisson structure defined in the fourth aspect, in the inner space of the caisson partitioned by an inner wall, a side closer to the side wall facing the sea side. In the internal space, water having a water level higher than the upper surface of the waste stored in the waste storage chamber is stored.

In the caisson of this configuration, the pressure (water pressure) of water stored in the internal space on the side close to the side wall facing the sea side
By pressing the water held in the waste stored in the waste storage chamber by the water pressure difference, it is possible to prevent the water from leaking from the inner wall into the internal space on the side where the water is stored, Depending on the waste stored in the storage room,
There is no risk of polluting the sea.

[0029] In the present invention, the term "inside space close to the side wall facing the sea side" means the inside space on the side other than the waste storage room. In a caisson with a double hull structure with an inner wall built in, the `` inner space close to the side wall facing the sea side '' means a moat-shaped space surrounding the waste storage room. Become. The same applies to the following inventions.

The caisson structure according to claim 6 is the caisson structure according to claim 4 or 5, wherein the water stored in the waste accommodating chamber is provided outside the caisson. At least one of water collecting / draining means for draining, storing means for separating the retained water from the waste and temporarily storing the same, and processing means for purifying the retained water (water purification processing means, etc.) Is provided.

In the caisson having this configuration, the water retained in the waste storage chamber can be drained to the outside of the caisson by the water collecting and draining means provided in the waste storage chamber. Can be prevented from accumulating in large quantities, and the storage means provided in the waste storage chamber
The retained water to be discharged to the outside can be separated from the waste and temporarily stored, and the treated water provided in the waste storage room can be used to purify the retained water and safely return to the sea. Can be discharged.

According to a seventh aspect of the present invention, in the caisson structure according to any one of the fourth to sixth aspects, in the caisson structure defined in any one of the fourth to sixth aspects, in the caisson internal space partitioned by an inner wall, the caisson is located on the sea side. It is characterized in that a partition wall for partitioning the internal space on the side close to the facing side wall into a plurality of spaces in the circumferential direction of the side wall is further constructed.

In the caisson having this configuration, the internal space on the side close to the side wall facing the sea side is divided into a plurality of spaces, so that the leaked portion from the inner wall is specified for each of the divided partial spaces. Becomes easier. In addition, by increasing or decreasing the amount of water injected for adjusting the draft for each partial space, it becomes easy to balance the weight of the caisson.

The caisson structure according to claim 8 is the caisson structure according to any one of claims 4 to 7, wherein the caisson has an inner space partitioned by an inner wall and located on the sea side. It is characterized in that a partition wall is further constructed to partition an inner space far from the facing side wall into a plurality of spaces in a circumferential direction of the inner wall.

In the caisson of this configuration, since the internal space farther from the side wall facing the sea is divided into a plurality of spaces, the leaked portion from the inner wall is specified for each of the divided partial spaces. Becomes easier.

According to a ninth aspect of the present invention, in the caisson structure according to any one of the fourth to eighth aspects, in the caisson structure according to any one of the fourth to eighth aspects, in the caisson internal space partitioned by an inner wall, the caisson is located on the sea side. It is characterized in that a monitoring means for detecting the presence or absence of a leak from the waste storage chamber is provided in an internal space close to the facing side wall.

In the caisson having this configuration, the monitoring means detects the waste and the retained water leaked into the inner space on the sea side, thereby finding and confirming the defect of the inner wall and the state of the deterioration of the durability performance at an early stage. You can also. The monitoring means may detect leakage by monitoring, for example, the water level, water quality or concentration.

According to a tenth aspect of the present invention, in the caisson structure according to any one of the fourth to ninth aspects, there is provided a caisson structure which covers the entire upper surface of the waste stored in the waste storage chamber, or At the upper end opening of the waste storage chamber,
A lid structure for closing the entire surface or the upper end opening is formed.

In the caisson of this configuration, the entire upper surface of the waste stored in the waste storage chamber or the upper end opening of the waste storage chamber is closed by a lid structure. Rainwater and overtopped seawater can be prevented from entering, and wastewater can be prevented from floating up by the rainwater and overflowing from the upper end opening of the waste storage room. Can be safely stored.

The lid structure may be a lid made of concrete or an iron plate which has been solidified when closing the upper surface of the waste or the upper end opening of the waste accommodating chamber. It may be a liquid material such as concrete before solidification or a powdery material such as cement powder before water mixing. Further, the structure may be made up of a water-blocking sheet that covers the entire surface such as the upper end opening and a water-blocking material such as an asphalt mixture that closes a gap between the water-blocking sheet and the inner surface of the inner wall.

The thickness of the inner side wall and the inner bottom slab used in the structure of each caisson described above is preferably, for example, 50 cm or more, and the reduced water permeability is, for example, 1.0 × 10 ⁻⁶ cm /. sec or less.

According to a eleventh aspect of the present invention, there is provided a caisson revetment in which a large number of caissons having the structure according to any one of the first to tenth aspects are arranged in a row at a predetermined position in the sea.
It is configured to partition the waste receiving area.

In the caisson revetment of this configuration, the inner wall partitioning the inner space of the caisson is constructed inside the side wall facing the sea side while being arranged in the sea as a revetment.
The inner space of the caisson is divided into two parts, an inner space surrounded by a seaside side wall and an inner wall, and an inner space surrounded by an opposite side wall, that is, a side wall on the waste receiving area side and an inner bulkhead. Of the two internal spaces, the internal space far from the sea side faces the sea through the internal space on the sea side.

Therefore, even if the material (for example, the waste itself) stored in the internal space far from the sea side or the material (for example, the retained water) stored in this internal space leaks from the internal space, It either leaks into the interior space on the sea side or leaks into the waste receiving area, and in either case it does not leak directly into the sea and there is no risk of polluting the sea. Therefore, it is possible to store waste waiting to be received in the internal space far from the sea side, and to secure the waste safely in each caisson early before it is completed as a revetment that partitions the waste receiving area. Can be accepted.

Further, by monitoring the waste and the retained water leaking into the inner space on the sea side, it is possible to early find and confirm the defect of the inner wall and the state of deterioration of the durability performance. In the unlikely event that such a leak is found, repairs and reinforcements can be taken at an early stage, such as repairing the inner wall or installing a concrete or asphalt mixture in the seaside internal space. By injecting a water-blocking material such as clay or the like, and sealing the entire space, it is possible to stop leakage from the internal space far from the sea side at an early stage.

Furthermore, the caisson revetment of the present invention can also exhibit actions and effects corresponding to the actions and effects exerted by the caisson structures described in the respective claims.

According to a twelfth aspect of the present invention, there is provided a method for constructing a caisson revetment in which a large number of caissons are arranged in a row at a predetermined position in the sea to partition a waste receiving area. 10 comprising the structure of a caisson according to any one of 10, wherein, prior to completely partitioning the waste receiving area, of the inner space defined by the inner wall, from the side wall facing the sea side It is characterized in that wastes are stored in the internal space on the far side.

According to this caisson seawall construction method, in order to construct a seawall using the caisson according to any one of claims 1 to 10, the seawall is partitioned by an inner partition wall prior to being arranged in the sea. Even if waste is stored or leaked from the inner space farther from the side wall facing the sea side, it does not leak directly to the sea even if it leaks from the inner space, and there is no danger of polluting the sea. Absent. Therefore, it is possible to store the waste waiting to be received in the internal space far from the sea side, and it is possible to safely receive the waste in each caisson at an early stage before completion as a caisson revetment.

Further, by monitoring the waste and retained water leaked into the interior space on the sea side of each caisson, it is possible to determine which caisson of the caisson revetment has a defect or a reduced useful life. It can be found and confirmed early. In the unlikely event that such a leak is found, repairs and reinforcements can be taken at an early stage, such as repairing the inner wall or installing a concrete or asphalt mixture in the seaside internal space. By injecting a water-blocking material such as clay or the like, and sealing the entire space, it is possible to stop leakage from the internal space far from the sea side at an early stage.

Further, the caisson seawall construction method of the present invention can exhibit actions and effects corresponding to the actions and effects respectively exhibited by the caisson structures described in the respective claims.

According to a thirteenth aspect of the present invention, in the method for constructing a caisson revetment according to the twelfth aspect, the caisson is surfaced on the sea side during a period in which the caisson is moored near the coast. The waste is accommodated in an internal space far from a side wall to be formed.

According to this method, the waste can be put into the caisson immediately after the caisson is launched and during the period of mooring near the coast. Can be performed, and the work of inputting waste is reduced.

Further, since the waste conveyed from various places to the coast can be sequentially fed into the caisson from the coast, the work flow becomes smooth.

According to a fourteenth aspect of the present invention, in the method for constructing a caisson revetment according to the twelfth aspect or the thirteenth aspect, after the waste is stored in the internal space, the stored waste is removed. A lid structure for closing the entire surface or the upper end opening is formed on the entire upper surface or at the upper end opening of the internal space on the side where the waste is stored.

According to this method, the entire upper surface of the waste accommodated in the waste accommodating chamber or the upper end opening of the waste accommodating chamber is closed by the lid structure. Rainwater and overtopped seawater can be prevented from entering, and wastewater can be prevented from floating up by the rainwater and overflowing from the upper end opening of the waste storage room. Can be safely stored.

[0056]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a caisson, a caisson revetment, and a method of constructing a caisson revetment according to the present invention will be described below with reference to the drawings. However, each embodiment is not limited by these embodiments.

(Embodiment 1) FIG. 1 is a perspective view showing a schematic structure of a caisson according to Embodiment 1 of the present invention, and FIG. 2 is a sectional view of the caisson shown in FIG. FIG. 3 is a view showing caisson revetments in which a large number of the caisson shown in FIGS. 1 and 2 are arranged in the sea.

The caisson revetment 20 is arranged so that the caisson 10 is arranged along the broken line in FIG. 3 to partition a coastal area surrounded by the coast 21 and the caisson revetment 20 as a waste receiving area 32 for final disposal of waste. It is a seawall.

As shown in FIGS. 1 and 2, the caisson 10 is a substantially rectangular bottom plate 1 made of a steel plate.
1, an outer wall 12 rising from the vicinity of each edge of the bottom slab 11, and an inner wall 15 rising from the bottom slab 11 inside the outer wall 12 as a basic structure.

Here, the bottom plate 11 may be a single steel plate in detail, but a plurality of elongated strip-shaped steel plates are arranged adjacent to each other in a certain direction, and the adjacent steel plates are joined by welding or the like. Alternatively, it may be a single bottom plate as a whole. Alternatively, a plurality of small rectangular steel plates may be arranged adjacent to each other in a matrix, and the adjacent steel plates may be joined to each other by welding or the like to form a single sole plate as a whole.

The outer wall 12 has outer long walls 12a, 12c rising from a position inside the long edge of the bottom plate 11, and outer short walls 12b, 12d rising from the short edge of the bottom plate 11.
And has a substantially rectangular parallelepiped shape as a whole. Each of the outer long walls 12a and 12c and the outer short walls 12b and 12d may be a single steel plate, as in the case of the bottom slab 11, or a plurality of steel plates may be joined to form a single plate as a whole. It may form a body. The lower edge of the outer wall 12 is joined to the bottom plate 11 in a watertight manner over the entire circumference.

From the long side edge of the bottom plate 11 to the outer long wall 12a,
The protruding portion up to the position where the 12c rises is the footing 11a. In the footing 11a, the length of the footing 11a and the bottom plate 11 and the outer long walls 12a, 1
The number and shape of the buttresses (ribs) 13 for joining the caisson 10 are appropriately determined according to the strength of waves, swells in the sea, earth pressure, waste load, seismic force, etc. on the sea surface where the caisson 10 is laid. Is set.

The outer wall 1 is spaced apart from the outer wall 12 by a predetermined distance.
Inner wall 15 rising from bottom slab 11 inside 2
Is the inner long wall 1 parallel to the outer long walls 12a, 12c.
5a, 15c and inner short walls 15b, 15d parallel to the outer short walls 12b, 12d, and have a substantially rectangular parallelepiped shape as a whole. Each of these inner long walls 15a, 1
5c and each of the inner short walls 15b and 15d may be a single steel plate, as in the case of the bottom plate 11 and the outer wall 12, or a plurality of steel plates may be joined to form a single plate as a whole. The lower end edge of the inner wall 15 is also joined to the bottom plate 11 in a watertight manner over the entire circumference.

The outer wall 12 and the bottom plate 11 and the inner wall 15 and the bottom plate 11 are not water-tightly joined but are joined by ordinary welding or fastening means. By laying a water-impervious sheet or by laying concrete or the like on the outer surface, the desired water-impervious performance (for example, a water permeability of 1.0 × 10 ⁻⁶ cm / sec or less (wall thickness 50 cm Etc.) may be secured.

The outer wall 12, the inner wall 15, and the bottom slab 11 may be provided with a reinforcing material such as a rib, or a beam or the like may be provided between them.

As described above, the inner side wall 1 is provided inside the outer side wall 12.
5, the inner space 14 surrounded by the outer wall 12 and the bottom plate 11 is submerged in the sea as a caisson revetment 20, as shown in FIG. 3, according to the caisson 10 partitioned into two spaces 14a and 14b. In this state, the inner space 14a faces the sea 31 via the double wall of the inner wall 15 and the outer wall 12, so that even if only one of the inner wall 15 and the outer wall 12 is damaged, The space 14a does not directly communicate with the sea 31.

Therefore, even if the inner space 14a is used as a waste accommodating chamber and the waste is accommodated in the waste accommodating chamber 14a, the accommodated waste is transferred to the inner side wall 1 serving as a double partition wall.
Since it is isolated from the sea 31 by the outer wall 5 and the outer wall 12, the waste can be stored safely.

Therefore, the waste 60 to be stored in the waste receiving area 32 after the completion of the revetment 20 can be safely received in the waste storage room 14a of the caisson 10 before the completion of the revetment 20. We can respond to requests for early acceptance of goods.

Further, due to the defect of the inner wall 15 and the deterioration of the durability, etc., the waste accommodating chamber 1a is moved from the waste accommodating chamber 14a.
Even when the retained water such as the waste 60 or the water generated from the waste leaks into the compartment 14b, which is the space outside the space 4a, by providing a monitoring device for monitoring the leakage in the compartment 14b, At a stage before the waste 60 etc. leaks to the sea 31, that is, at a stage before the sea 31 is contaminated, the leak can be detected, and a defect of the inner wall 15 and a deterioration state of the durability performance are found at an early stage. After confirmation, appropriate measures such as repair and reinforcement can be taken at an early stage.

The monitoring device may have a function of detecting, for example, the level, quality and concentration of the water stored in the compartment 14b.

Further, as described above, since the safety against leakage is high, even if the construction of the submarine ground or mound where the caisson 10 is to be laid is not yet completed, the waste 60 is stored in the sea It is also possible to temporarily mooring / temporarily keep the mooring at another place.

By closing the upper end openings of the waste storage chamber 14a and the compartment 14b with the lid 16 (see FIG. 6 (described later)), the waste 60 stored in the waste storage chamber 14a can be removed. Caisson 10 that is blown off by the wind or shakes itself, moored at sea
And it is possible to prevent rainwater and waves from entering, and to prevent waste 60 from overflowing from the waste accommodating chamber 14a and water level fluctuation in draft adjustment.

The caisson revetment 20 and the method of constructing the caisson revetment 20 using the caisson 10 will be specifically described below.

First, each caisson 10 built at a land factory or on the coast is launched into the sea from the coast and towed to a predetermined position to be laid as a caisson revetment 20. As shown in FIG. 4, the waste 60 to be accommodated in the waste receiving area 32 later is moved to the caisson 10 in a state moored near the coast 21 by a waste loading machine 22 or the like installed on the coast 21. Into the waste storage chamber 14a.

The caisson 10 in which the waste 60 is stored in the waste storage chamber 14a, as shown in FIG.
In the compartment 14b, which is the space outside the space 4a, water 70 such as seawater is placed.
Is drafted, and the draft is adjusted. Thereafter, it is towed by a tug boat or the like to the sea position where it is to be submerged. The draft adjustment is performed for the waste 60 stored in the waste storage chamber 14a.
The water injection amount is adjusted according to the weight of the caisson 10 and the desired floating amount of the caisson 10.

At the sea position where the caisson 10 is to be submerged, as shown in FIG. 6, the ground adjustment of the seabed 40 is performed in advance, and the caisson 10 is stably arranged on the seabed 40. Flat mound 50 is formed.

Then, the caisson 10 uses the mound 1
After being towed to a position above zero, seawater is injected into the compartment 14b to increase the weight, and is submerged on the mound 10. Thereafter, a heavy object such as earth and sand 80 is put into the compartment 14b, and the caisson 10 is firmly installed on the mound 50. After the installation, the lid 16 is put on the upper end opening of the caisson 10, and the waste accommodating chamber 14a and the compartment 14b of the caisson 10 are closed.

By repeating the above operation for each caisson 10 constituting the caisson revetment 20, the waste receiving area 32 is formed by arranging the caisson 10 on the broken line in FIG. According to the caisson revetment 20 and the method of constructing the caisson revetment of the embodiment, the waste receiving area 32 is formed by the caisson 10 in the sea 3.
At the launch stage of each caisson 10, which is a stage before completely separating from 1, the respective caisson 10 can safely receive the waste 60, and the early acceptance of the waste can be realized.

The caisson 10 has high safety against leakage of the waste 60 and the like.
Even if the construction of the sea floor 40 and the mound 50 where the ground is to be submerged is not completed, the waste 60 is stored in the waste storage room 14a.
While temporarily housed in the sea, it can be safely moored and temporarily stored elsewhere on the sea.

Further, each of the compartments 14b of each caisson 10 constituting the caisson revetment 20 thus constructed is provided with a monitoring device for monitoring the leakage of the waste 60 and the like from the waste accommodating room 14a. By monitoring the leakage of waste 60 etc. by the device,
Even after the completion of the caisson revetment 20, the leakage of the waste 60 and the like can be continuously monitored, and when such leakage is detected, the caisson 10 in which the leakage has occurred can be identified at an early stage, and promptly. And measures such as repair and reinforcement can be taken.

In the state in which the waste 60 is stored in the waste storage chamber 14a, the waste storage is performed even during temporary mooring, temporary storage, or after a heavy material such as earth and sand 80 is thrown into the compartment 14b. It is preferable that the compartment 14b be filled with water 70 so that the water level is higher than the upper surface of the waste 60 stored in the chamber 14a. By filling the water 70, the leakage can be easily monitored by the monitoring device, and the water in the waste storage chamber 14a can be more easily compared with the water in the waste storage chamber 14a.
This is because the water pressure of the water 70 in the 4b is increased, and the retained water is less likely to permeate from the waste storage chamber 14a.

In the above-described embodiment, a lid 16 made of concrete or the like is used to close the upper end opening of the caisson 10. However, instead of such a lid 16, FIG. As shown in FIG. 5, a water-impervious sheet 16a covering the upper surface of the waste 60 stored in the waste storage chamber 14a
A lid structure may be used, which includes a waterproof material 16b of an asphalt mixture or the like (asphalt mixture, concrete, clay, or the like) that closes a gap between the waterproof sheet 16a and the inner surface of the inner side wall 15. Further, as shown in FIG. 7B, the upper surface of the waste 60 accommodated in the waste accommodating chamber 14a is covered.
A lid structure with a cover soil 16c of earth and sand, clay, asphalt mixture, concrete, or the like may be used.

In the embodiment described above, the waste receiving area 32 is formed by the revetment 20 and the coast 21 as shown in FIG. 3, but as shown in FIG. A waste receiving area 32 (area surrounded by a broken line) may be formed only by the revetment 20 offshore away from the coast, or the waste receiving area 32 may be temporarily formed offshore off the coast in this way. After the formation, the revetment 20 partitioning the waste receiving area 32 is extended toward the coast 21 as shown by the broken line in FIG. 8B, and a new area surrounded by the coast 21 and the revetment 20 is formed. 32 'may be extended as a waste receiving area.

As shown in FIG. 9, the compartment 14b of the caisson 10 is divided by the compartment partition wall 19b into the first compartment b.
A plurality of compartments, such as a first compartment b2, a second compartment b2,..., A tenth compartment b10, may be provided. A monitoring device is provided for each of the compartments b1 to b10 thus partitioned, By detecting leakage to each of the compartments b1 to b10, even if the waste 60 or the retained water leaks from the inner wall 15, the leaked portion can be easily identified, and repair / reinforcement can be quickly performed. Can be applied. Further, when repair or the like is difficult, the compartments b1, b in which the leakage is detected
It is also possible to pour concrete or the like into 2,... Or b10 to completely fill the compartment and stop leakage. In addition, by increasing or decreasing the water injection amount for adjusting the draft for each of the partitioned compartments b1 to b10, it is easy to balance the weight of the caisson 10.

Further, as shown in FIG.
As shown in FIG. 10, a plurality of waste storage chambers 14a, such as a first storage chamber a1, a second storage chamber a2,..., A sixth storage chamber a6, are also formed by the storage chamber partition wall 19a. By dividing the waste storage chamber into a plurality of storage chambers as described above, each of the storage chambers a1 to
For each a6, different types of wastes are stored, and some of the storage rooms do not store the wastes 60 but retain water such as water generated from the wastes 60 stored in other storage rooms. A water collecting and draining device that collects water and uses the collected water as a water storage tank for temporarily storing the water before processing, or collects such water and discharges the water outside the caisson 10. It can also be used for purposes such as installation or installation of a treatment device for purifying retained water to such an extent that it can be dumped into the ocean.

Further, by dividing the waste accommodating chamber 14a into a plurality of sections as described above, the holding water and the waste 6
The risk that 0 leaks into the compartment 14b and the trouble of repair can be dispersed. In addition, as shown in FIG.
Also, it is preferable that the compartments are divided into compartments b1 to b6 so as to correspond to the accommodation rooms a1 to a6 in order to easily specify a leak compartment by monitoring.

The caisson 10 includes a storage device such as a water storage tank for storing retained water, a water collection / drainage device, a treatment device (such as a water purification treatment device), and the like. It may be provided in a portion other than a6.

(Embodiment 2) FIG. 11 shows Embodiment 1 of the present invention.
3 is a cross-sectional view showing an embodiment in which the bottom plate of the caisson 10 shown in FIG. 1 is also a double structure, and furthermore, an inner bottom plate 17 supported by a support member 18 at a predetermined distance from the bottom plate 11 inside the bottom plate 11. Then, the lower end of the inner wall 15 is joined to the inner bottom slab 17 so that the inside of the caisson 10 has a completely double box structure.

According to the caisson 10 constructed in this manner, the waste accommodating chamber 14a has not only the side wall but also the bottom, so that the function and effect of the caisson of the first embodiment described above are exhibited. In addition, the safety and reliability against leakage from the bottom are further improved.

(Embodiment 3) FIG. 12 is a perspective view showing a schematic structure of a caisson according to Embodiment 3 of the present invention.
FIG. 3 is a sectional view taken along line II-II of the caisson shown in FIG.

The caisson 10 is different from the conventional caisson in that the caisson seawall 20 shown in FIG. 3 or FIG. It is a caisson that has constructed a wall 15, and the inner wall 15 is an inner space 14 of the caisson 10.
Is divided into a waste storage chamber 14a and a compartment 14b.

According to the caisson 10 configured as described above, similarly to the caisson 10 of the first embodiment, when the caisson revetment 20 is submerged in the sea, the waste accommodating chamber 14 a Since the ocean 31 is faced through the double partition wall 12, even if only one of the inner wall 15 and the outer wall 12 is damaged, the waste storage chamber 14a
And the sea 31 do not communicate directly.

Therefore, in the waste storage chamber 14a,
Waste can be stored safely, and caisson revetment 20
Waste 6 to be stored in the waste receiving area 32 after completion
0, before caisson revetment 20 was completed, caisson 10
Can be safely received in the waste storage room 14a,
It can respond to the demand for early receipt of waste.

Further, due to the defect of the inner wall 15 and the deterioration of the durability performance, etc., the waste accommodating chamber 1
Even in the case where retained water such as waste or water generated from waste leaks into the compartment 14b, which is a space outside the space 4a, by providing a monitoring device for monitoring the leakage in the compartment 14b, In the stage before the wastes leak into the sea 31, that is, before the sea 31 is contaminated, the leak can be detected, and the defect of the inner wall 15 and the deterioration of the durability performance are found and confirmed at an early stage. Then, appropriate measures such as quick repair and reinforcement can be taken.

By closing the upper end openings of the waste accommodating chamber 14a and the compartment 14b with the above-described lid 16, the waste 60 accommodated in the waste accommodating chamber 14a is blown off by the wind. To prevent the caisson 10 itself moored at sea from being dissipated to the outside of the caisson 10,
The waste 60 can be prevented from overflowing from the waste accommodating chamber 14a and the fluctuation of the water level in the compartment 14b can be prevented.

The caisson 10 of the third embodiment described above
Although the caisson has the inner wall 15 formed only on the inner side of the outer long wall 12c facing the sea 31 side, as shown in FIG. 14 (1), the outer side which is one of the side walls in the arrangement direction of the caisson 10 As shown in FIG. 14 (2), the caisson of the embodiment in which the inner wall 15 is constructed also on the inner side of the short wall 12b to construct the inner wall 15 having a substantially L-shaped cross section as a whole.
Outer short wall 12 which is both side walls in the arrangement direction of caissons 10
The inner wall 15 is constructed inside each of b and 12d,
The caisson of the embodiment in which the inner wall 15 having a substantially U-shaped cross section as a whole exhibits the same operation and effect as the caisson 10 of the third embodiment.

[0097]

As described above, according to the caisson according to the present invention (claim 1), the caisson internal space is provided inside the side wall facing the sea side while being arranged in the sea as seawalls. Since the partitioning inner wall is constructed, the inner space of the caisson is surrounded by the seaside side wall and the inner wall, and the inner space surrounded by the opposite side wall, that is, the side wall on the waste receiving area side and the inner partition. The inner space farther from the sea side of the two inner spaces faces the sea through the inner space on the sea side.

Therefore, even if the material (for example, the waste itself) stored in the internal space far from the sea side or the material (for example, the retained water) stored in this internal space leaks from the internal space, It either leaks into the interior space on the sea side or leaks into the waste receiving area, and in either case it does not leak directly into the sea and there is no risk of polluting the sea. Therefore, it is possible to store waste waiting to be received in the internal space far from the sea side, and to secure the waste safely in each caisson early before it is completed as a revetment that partitions the waste receiving area. Can be accepted.

Further, by monitoring the waste and water retained in the inner space on the sea side, it is possible to early find and confirm the defect of the inner wall and the deterioration of the durability performance. In the unlikely event that such a leak is found, repairs and reinforcements can be taken at an early stage, such as repairing the inner wall or installing a concrete or asphalt mixture in the seaside internal space. By injecting a water-blocking material such as clay or the like, and sealing the entire space, it is possible to stop leakage from the internal space far from the sea side at an early stage.

Also, by injecting and draining water into the inner space on the sea side, it is possible to adjust the draft according to the amount of waste housed. Therefore, ground improvement and mounding of the sea floor where the caisson will be installed is not yet completed. Even in the completed state, the amount of water injected can be adjusted and temporarily moored or temporarily placed at another place on the sea.

According to the caisson according to the present invention (claim 2), since the inner peripheral wall is formed by the inner side walls respectively constructed inside the plurality of side walls, the entire caisson has a double wall (double hull) structure. A moat-like space surrounded by the inner wall and the outer wall is formed outside the inner space of the inner wall.

Therefore, even if the material accommodated in the inner space of the inner wall leaks out of the inner space, it only leaks into the outer moat-shaped space and does not leak directly to the sea. There is no risk of polluting the sea. Therefore,
It is possible to safely store waste waiting to be received in the inner space of the inner wall, and it is possible for each caisson to safely receive waste early before it is completed as a revetment that partitions the waste receiving area. it can.

The inner space of the inner wall is double-walled over the entire circumference and is isolated from the sea. Therefore, even during temporary mooring or temporary storage where the entire circumference of the outer wall faces the sea. In addition, the waste housed in the inner space of the inner wall can be safely managed.

Further, since a moat-shaped internal space is formed over the entire circumference on the outer side of the inner wall, when adjusting the draft by injecting / draining water into the moat-shaped internal space, how much water is injected is determined. Regardless, the floating and sinking can be adjusted in a well-balanced manner without tilting.

According to the caisson according to the present invention (Claim 3), since the caisson has a double bottom structure, objects housed in the inner space surrounded by the inner bottom slab and the inner side wall are, for example, those of the inner space. Even if it leaks from the bottom (inner bottom slab), it only leaks into the space in contact with the outer bottom slab, does not leak directly to the sea, and there is no risk of polluting the sea. Therefore,
It is possible to safely store waste waiting to be received in the inner space of the inner wall, and it is possible for each caisson to safely receive waste early before it is completed as a revetment that partitions the waste receiving area. it can.

According to the caisson according to the present invention (claim 4), the interior space on the far side from the side wall facing the sea side is a waste storage room for storing waste, so that the waste storage room is , Facing the sea through the side wall facing the sea side,
The waste stored in the waste storage room does not leak directly to the sea, and there is no risk of polluting the sea.

According to the caisson according to the present invention (claim 5), the caisson is accommodated in the waste accommodating chamber by the pressure (water pressure) of the water stored in the internal space near the side wall facing the sea side. The waste can be prevented from leaking from the inner wall into the internal space on the side where the water is stored, and there is no danger of polluting the sea with the waste stored in the waste storage chamber.

According to the caisson of the present invention (claim 6), the water retained in the waste storage chamber can be drained to the outside of the caisson by the water collecting and draining means provided in the waste storage chamber. In addition, it is possible to prevent a large amount of retained water from being stored in the waste storage room, and to temporarily separate retained water to be discharged from the waste by a storage means provided in the waste storage room. At the waste storage chamber,
Purified water can be safely discharged to the sea.

According to the caisson according to the present invention (claim 7), since the internal space on the side close to the side wall facing the sea is divided into a plurality of spaces, the portion leaking from the inner side wall is divided. It becomes easy to specify each of the specified subspaces. In addition, by increasing or decreasing the amount of water injected for adjusting the draft for each partial space, it becomes easy to balance the weight of the caisson.

According to the caisson according to the present invention (claim 8), since the internal space farther from the side wall facing the sea is divided into a plurality of spaces, the leaked portion from the inner wall is divided. It becomes easy to specify each of the specified subspaces.

According to the caisson according to the present invention (claim 9), the monitoring means detects waste or water retained in the inner space on the sea side, thereby causing a defect on the inner wall and a decrease in durability. The situation can be discovered and confirmed at an early stage. The monitoring means may detect leakage by monitoring, for example, the water level, water quality or concentration.

A caisson according to the present invention (Claim 10)
According to the present invention, since the entire upper surface of the waste stored in the waste storage chamber or the upper end opening of the waste storage chamber is closed by a lid structure, rainwater or overtopped seawater is added to the waste storage chamber. Can be prevented from entering, and the wastewater can be prevented from floating up by the rainwater and overflowing from the upper end opening of the waste storage chamber, and the waste can be safely stored in the internal space. State can be maintained.

The caisson seawall according to the present invention (claim 1)
According to 1), since the inner wall partitioning the inner space of the caisson is constructed inside the side wall facing the sea side while being arranged in the sea as seawalls, the inner space of the caisson is a seaside side wall. And an inner space surrounded by an inner wall, and an inner space surrounded by an opposite side wall, that is, a side wall on the side of the waste receiving area and an inner partition, and of these two inner spaces, which is far from the sea side. The inner space on the side faces the sea via the inner space on the sea side.

Therefore, even if the material (for example, the waste itself) stored in the internal space far from the sea side or the material (for example, the retained water) stored in the internal space leaks from the internal space, It either leaks into the interior space on the sea side or leaks into the waste receiving area, and in either case it does not leak directly into the sea and there is no risk of polluting the sea. Therefore, it is possible to store waste waiting to be received in the internal space far from the sea side, and to secure the waste safely in each caisson early before it is completed as a revetment that partitions the waste receiving area. Can be accepted.

Further, by monitoring the waste and water retained in the inner space on the sea side, it is possible to quickly detect and confirm the defect of the inner wall and the deterioration of the durability performance. In the unlikely event that such a leak is found, repairs and reinforcements can be taken at an early stage, such as repairing the inner wall or installing a concrete or asphalt mixture in the seaside internal space. By injecting a water-blocking material such as clay or the like, and sealing the entire space, it is possible to stop leakage from the internal space far from the sea side at an early stage.

Further, actions and effects corresponding to the actions and effects exerted by the caisson structure described in each claim can be exhibited.

According to the method for constructing a caisson seawall according to the present invention (claim 12), the seawall is constructed using the caisson according to any one of the above-mentioned claims 1 to 10, so that the seawall can be lined up in the sea. Earlier, even if waste is stored in or leaked from the inner space of the inner space separated by the inner bulkhead, which is farther from the side wall facing the sea, it will not leak directly to the sea. There is no risk of polluting the sea. Therefore, in the internal space far from the sea side,
It is possible to contain the waste waiting to be received, and before each caisson revetment is completed,
Waste can be accepted safely.

Further, by monitoring the waste and retained water leaked into the inner space on the sea side of each caisson, it is possible to determine which caisson of the caisson revetment has a defect or a decrease in durability. It can be found and confirmed early. In the unlikely event that such a leak is found, repairs and reinforcements can be taken at an early stage, such as repairing the inner wall or installing a concrete or asphalt mixture in the seaside internal space. By injecting a water-blocking material such as clay or the like, and sealing the entire space, it is possible to stop leakage from the internal space far from the sea side at an early stage.

Further, actions and effects corresponding to the actions and effects exerted by the structure of the caisson described in each claim can be exhibited.

According to the method for constructing a caisson revetment according to the present invention (claim 13), it is possible to throw waste into the caisson immediately after the caisson is launched and during mooring near the coast. As a result, waste input work can be performed in the vicinity of the coast, and waste input work can be reduced.

Further, since the waste conveyed from various places to the coast can be sequentially fed into the caisson from the coast, the work flow becomes smooth.

According to the method for constructing a caisson revetment according to the present invention (claim 14), the entire upper surface of the waste accommodated in the waste accommodating chamber or the upper end opening of the waste accommodating chamber has a lid structure. It is possible to prevent rainwater and overtopped seawater from entering the waste storage room, and that the wastewater floats up due to the rainwater and overflows from the upper end opening of the waste storage room. Can be prevented, and a state in which waste is safely stored in the internal space can be maintained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a schematic structure of a caisson according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the caisson shown in FIG. 1 taken along the line II.

FIG. 3 is a diagram showing caisson revetments in which the caissons shown in FIGS. 1 and 2 are arranged in a row in the sea.

FIG. 4 is a diagram illustrating a state in which waste is stored in a waste storage chamber of a caisson.

FIG. 5 is a diagram showing draft adjustment of a caisson containing waste.

FIG. 6 is a view showing a laid state of a caisson containing waste.

FIG. 7 is a view showing another embodiment of the lid structure.

FIG. 8 is a diagram showing another partition mode of the waste receiving area.

FIG. 9 is a diagram showing a caisson in which a compartment is divided into a plurality of spaces.

FIG. 10 is a diagram showing a caisson in which a compartment and a waste storage room are divided into a plurality of spaces.

FIG. 11 is a sectional view showing a schematic structure of a caisson according to a second embodiment of the present invention.

FIG. 12 is a perspective view showing a schematic structure of a caisson according to a third embodiment of the present invention.

FIG. 13 is a sectional view of the caisson shown in FIG. 8 taken along the line II-II.

FIG. 14 is a perspective view of a caisson of an embodiment of an inner wall according to another construction aspect.

FIG. 15 is a view showing a conventional caisson.

FIG. 16 is a diagram showing a caisson sunk.

FIG. 17 is a diagram illustrating caisson revetment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Caisson 11 Bottom plate 11a Footing 12 Outer side wall 12a, 12c Outer long wall 12b, 12d Outer short wall 13 Buttress (rib) 14 Inner space 14a Waste storage room 14b Separator 15 Inner side wall 15a, 15c Inner long wall 15b, 15d Inner short wall

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Masashi Miyasaka 12 Nishiki-cho, Naka-ku, Yokohama-shi Inside Mitsubishi Heavy Industries, Ltd.Yokohama Works (72) Inventor Miwa Otsu 12, Nishiki-cho, Naka-ku, Yokohama-shi Yokohama Works, Mitsubishi Heavy Industries, Ltd. (72) Inventor Hiroto Tsuji 2-5-1 Marunouchi, Chiyoda-ku, Tokyo, Japan Mitsui Heavy Industries Co., Ltd. (72) Inventor Tatsu Waki, 1-45-93, Futamatagawa, Asahi-ku, Yokohama World Engineering Co., Ltd. F term (reference) 2D018 BA12 4D004 AA46 BB01 BB02

Claims (14)

[Claims] 1. A caisson structure used for a seawall for partitioning a waste receiving area, comprising: a bottom plate; and a plurality of side walls rising from the vicinity of each edge of the bottom plate. An inner wall defining an inner space of a caisson surrounded by the plurality of side walls and the bottom slab is provided inside the side wall facing the side at a predetermined distance from the side wall facing the sea side. And caisson structure. 2. The caisson according to claim 1, wherein an inner wall defining an inner space of the caisson is formed inside each of the plurality of side walls at a predetermined distance from each of the side walls. Structure. 3. The caisson structure according to claim 1, wherein an inner bottom slab that defines an inner space of the caisson is constructed inside the bottom slab at a predetermined distance from the bottom slab. . 4. The internal space of the caisson partitioned by the internal wall, the internal space farther from the side wall facing the sea side is a waste storage chamber for storing the waste. The caisson structure according to any one of claims 1 to 3, wherein 5. The inner space of the caisson partitioned by the inner wall, which is closer to the sea-side side wall than the upper surface of the waste stored in the waste storage chamber, The caisson structure according to claim 4, wherein high-water water is stored. 6. A collection / drainage system for draining water retained in the waste storage chamber to the outside of the caisson.
5. The apparatus according to claim 4, further comprising at least one of a drainage unit, a storage unit configured to temporarily store the retained water separated from the waste, and a processing unit configured to purify the retained water. Or the structure of a caisson according to 5. 7. A partition wall that partitions an inner space close to a side wall facing the sea side among a plurality of inner spaces of the caisson partitioned by the inner wall into a plurality of spaces in a circumferential direction of the side wall. The caisson structure according to any one of claims 4 to 6, further constructed. 8. A partition wall that partitions an inner space farther from the side wall facing the sea side into a plurality of spaces in a circumferential direction of the inner wall among the inner spaces of the caisson partitioned by the inner wall. The caisson structure according to any one of claims 4 to 7, further comprising: 9. Monitoring for detecting the presence or absence of leakage from the waste storage chamber in the inner space of the caisson partitioned by the inner wall and closer to the side wall facing the sea side. A caisson structure according to any one of claims 4 to 8, comprising means. 10. A lid structure for closing the entire surface or the upper end opening on the entire upper surface of the waste accommodated in the waste accommodating chamber or on the upper end opening of the waste accommodating chamber. The caisson structure according to any one of claims 4 to 9, wherein 11. A caisson revetment in which a large number of caissons are arranged in a row at a predetermined position in the sea to partition a waste receiving area, wherein the caisson has a caisson structure according to any one of claims 1 to 10. Caisson revetment characterized by that. 12. A method for constructing a caisson revetment in which a large number of caissons are arranged in a row at a predetermined position in the sea to divide a waste receiving area, wherein the caisson comprises a caisson according to any one of claims 1 to 10. Prior to completely partitioning the waste receiving area, of the internal space defined by the inner wall, storing waste in an internal space farther from the side wall facing the sea side. A caisson revetment construction method characterized by the following. 13. The waste according to claim 12, wherein the waste is contained in an internal space far from the side wall facing the sea side while the caisson is moored near the coast. How to build a caisson seawall. 14. After the waste is accommodated in the internal space, the entire surface or the upper end is placed over the entire upper surface of the accommodated waste or at the upper end opening of the internal space on the side where the waste is accommodated. The method for constructing a caisson revetment according to claim 12 or 13, wherein a lid structure for closing the opening is formed.