JP3276617B2 - Marine landfill method using sea sand - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ocean reclamation method using sea sand. More specifically, the present invention relates to an ocean reclamation method that can carry sea sand from which dredging is difficult to obtain in Japan from abroad and can throw sea sand into a reclamation sea area without substantially polluting seawater.

[0002]

2. Description of the Related Art When reclaiming the ocean, sea sand is often used. However, since dredging of sea sand affects the ecosystem, dredging of sea sand is prohibited in Japan, and even if dredging is permitted, sea sand is prohibited from being exported outside the prefecture. I do. Therefore, except in special cases, the supply of sea sand depends on foreign countries. When importing sea sand from abroad into Japan, usually 70,000 tons to 1 ton
Large bulk carriers of the order of 10,000 tons are used. In large bulk carriers, the hold is partitioned into multiple tanks, and sea sand is loaded into each tank overseas. After the voyage,
When a large bulk carrier arrives at the landfill sea area, the tank is mixed with seawater, and the sea sand is pumped out of the hold into a predetermined landfill sea area as a fluid.

[0003]

However, when a large bulk carrier is used and sea sand is pumped out of its hold into a landfill area, seawater pollution in the landfill area has a serious adverse effect on the ecosystem. Therefore, in Japan,
Pumping out sea sand directly from large bulk carriers is prohibited by law. In addition, if sea sand is put into a landfill sea area using a large bulk carrier, the large bulk carrier cannot be used for sea sand transport during land reclamation work, and the efficiency of sea sand transport from afar will be extremely low. become worse.

Accordingly, an object of the present invention is to provide a marine landfill method for introducing sea sand, which is carried in from abroad by a large ship in Japan, to an ecosystem-friendly and less polluted seawater into a landfill sea area. Another object of the present invention is to provide an ocean reclamation method for charging sea sand into a landfill sea area without making a large ship carrying sea sand from abroad stay at the landfill sea area for a long time.

[0005]

SUMMARY OF THE INVENTION The present invention firstly comprises a step of transporting sea sand to a landfill sea area by a large bulk carrier, and a method of transporting a large bulk carrier from a large bulk carrier without berthing. Pumping sea sand to land via pipes, loading sea sand from land to multiple small barge ships, navigating small barge ships, and loading sea sand from small barge ships into landfill sea areas The above problem is solved by a marine landfill method comprising steps.

According to the present invention, secondly, a step of cutting at least a part of a rocky reef or an island near a landfill sea area to provide a sea sand storage base, and transporting sea sand to a vicinity of the sea sand storage base by a large bulk carrier. And pumping sea sand from the large bulk carrier to the sea sand storage base via the floater transport pipe without berthing the large bulk carrier to the sea sand storage base. The above object is attained by an ocean reclamation method comprising a step of loading sea barge on a barge ship and a step of navigating the small barge ship and putting sea sand from the small barge ship into a landfill sea area.

[0007] Thirdly, the present invention provides a process for forming a sea sand storage base erected from the sea floor near the landfill sea area and isolated from seawater, and transporting sea sand to the vicinity of the sea sand storage base by a large bulk carrier. , Pumping sea sand from a large bulk carrier to a sea sand storage base, loading sea sand from a sea sand storage base to multiple small barge ships, and navigating a small barge ship to The above problem is solved by a marine landfill method comprising a step of charging sea sand from a barge ship into a landfill sea area.

[0010] Fourth, the present invention provides a step of transporting sea sand to a vicinity of a landfill sea area using a large bulk carrier, and a step of anchoring a sea sand storage vessel having a larger amount of drainage than the large bulk carrier near the landfill sea area, A process of transferring sea sand from a large bulk carrier to a sea sand storage ship, a process of loading sea sand from a sea sand storage ship to a plurality of small barge ships, and navigating a small barge ship to landfill from a small barge ship. The above problem is solved by an ocean reclamation method comprising a step of charging sea sand into a sea area.

[0009]

DETAILED DESCRIPTION OF THE INVENTION For example, a large bulk carrier loaded with sea sand is navigated overseas to transport sea sand to a predetermined landfill sea area. In many cases, there is no port near the landfill area where large bulk carriers can berth, so in the first invention, sea sand is pumped out from the large bulk carriers to land via a floater transport pipe. The floater transport pipe is suspended near the landfill area in connection with the land, and large-size bulk carriers arriving near the landfill area use the floater transport pipe to unload sea sand onto the land. In large bulk carriers, the hold is divided into a plurality of tanks, and after seawater is mixed into the tanks, the sea sand is discharged from the hold to the land as a fluid. Sea sand is pumped out from large bulk carriers and land is used instead of the sea, so that seawater is not undesirably polluted in the landfill sea area and seawater is unloaded quickly without worrying about seawater pollution. Work can be completed. Once the sea sand pump-out is completed, the large bulk carrier leaves the landfill area in preparation for the next sea sand transport.

When there is no land near the landfill sea area and there are rocky reefs or islands, it is preferable to cut out at least a part of the rocky reefs or islands and provide a flat sea sand storage base.
Also in this case, since there is a risk of grounding, it is difficult to berth large bulk carriers, so the sea sand is pumped out to the sea sand storage base by the floater transport pipe.

When there is no landform rising from the sea surface, such as land, reef or island, near the landfill sea area, it is preferable to artificially form a sea sand storage base. The sea sand storage base in this case is formed by erection of a sea sand storage base isolated from seawater on the seabed near the landfill sea area. The sea sand storage base can be provided, for example, by attaching a waterproof curtain to a protruding portion of a pillar standing on the sea floor at the sea surface, and forming the waterproof curtain in a bag shape inside the pillar. It is preferable that the waterproof curtain not only be attached to the pillar, but also attached to a rope with a floater spanned between the pillars. By doing so, the sea sand can be quickly pumped out from the large bulk carrier without causing sea area pollution due to pumping out to the sea sand storage base. Further, it is preferable to make the waterproof curtain large enough to reach the sea floor to prevent the waterproof curtain from being damaged or torn by the weight of the sea sand. The artificial sea sand storage base may be constructed by partitioning concrete walls from the sea floor to the sea surface. In any case, it is important to prevent the surrounding seawater from being polluted when pumping sea sand from large bulk carriers.

Further, when there is no land, reef or island in the landfill sea area and there is no shallow enough to construct an artificial sea sand storage base, the sea sand storage vessel may be anchored near the landfill sea area. preferable. Sea sand storage vessels discharge more water than large bulk carriers and can receive large amounts of sea sand from multiple large bulk carriers. By pumping out sea sand from a large bulk carrier using the above-mentioned floater transport pipe, the sea sand is transferred to a sea sand storage ship.

[0013] A plurality of small barge vessels are on standby near the land, the sea sand storage base or the sea sand storage vessel, and load small quantities of sea sand on these small barge vessels. The small barge ship reciprocates between land and sea sand storage bases and the landfill sea area, and loads the loaded sea sand into the landfill sea area. The small barge ship is equipped with a cargo handling device such as a crane for charging a small amount of sea sand into a landfill sea area, for example. By doing so, the sea sand can be injected into a predetermined landfill sea area without resorting to pump-out, and the sea can be landfilled with almost no seawater pollution in the landfill sea area.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A marine reclamation method according to the present invention will be described below with reference to the drawings. According to the present invention, when sea sand transported by a large bulk carrier is injected into a landfill sea area by pumping out, seawater pollution occurs around the landfill sea area, and sea sand transported by a large bulk carrier is injected into the landfill sea area at a small opening. Then, since the berthing period of the large bulk carrier is prolonged and the transport efficiency of the sea sand decreases, a large amount of sea sand is quickly and pumped out from the large bulk carrier to the land or the sea sand storage base, and the sea is transported. This is an ocean reclamation method that achieves both environmental safety and efficient transportation by injecting sand into the reclamation area at the forefront using a small barge ship.

FIG. 1 shows a process in which a large bulk carrier 10 loads sea sand, for example, overseas. The large bulk carrier 10 includes a plurality of tanks 12 in a hold. At the sea sand dredging site, sea sand dredged together with sea water is stored in respective tanks 12. Seawater is drained during navigation, and substantially only sea sand is transported to near the landfill sea area.

FIG. 2 shows a method of temporarily unloading a large amount of sea sand transported by the large bulk carrier 10 using the existing flat land 14 near the landfill sea area. As described above, when sea sand is directly pumped out from the large bulk carrier 10 to the landfill sea area, seawater pollution occurs around the landfill sea area.
First, the sea sand is temporarily unloaded from the sea. Further, by temporarily unloading the sea sand onto the land 14, all the sea sand can be quickly unloaded from the large bulk carrier 10, so that the bulk bulk carrier can be unloaded for a long time for unloading. 1
The large bulk carrier 10 whose unloading has been completed can be used immediately for the re-transport of the sea sand without anchoring the zero in the landfill sea area. A plurality of floater transport pipes 16 are previously suspended between the land 14 and the berth of the large bulk carrier 10. Each floater transport pipe 16
Comprises a plurality of floaters 18 and a transport pipe 20.
After arriving at the berth place, the large bulk carrier 10 draws seawater into the tank, and then pumps out the sea sand to the land 14 via the unused floater transport pipe 16. The large bulk carrier 10 that has unloaded all the sea sand in the tank onto the land 14 immediately leaves the anchoring place and starts sailing toward the sea sand dredging place. The large bulk carrier 10 can quickly transport a large amount of sea sand to the vicinity of the landfill sea area by repeatedly reciprocating between the sea sand dredging place and the berthing place. In addition, when a plurality of large bulk carriers 10 are put into service between the sea sand dredging site and the berthing site, a large amount of sea sand can be transported. When the landfill operation is performed, the transportation efficiency is deteriorated as described above, and a marine accident occurs due to collision between ships. The present invention also intends to prevent a marine accident in the case of transporting a large amount of sea sand by a plurality of large bulk carriers by using a temporary storage area for sea sand.

FIG. 3 shows that there is no land 14 near the landfill sea area,
Instead, it shows an example of an ocean reclamation method when there are reefs and islands. First, the top of the island 22 is cut off flat, and an artificial simple harbor or a simple pier is constructed using the earth and sand at that time so that small ships can berth without stranded. Then, the island 22 whose top is cut off is used as a temporary sea sand storage base. A plurality of floater transport pipes 16 are floated around the island 22, and sea sand is temporarily unloaded from the large bulk carrier 10 using the floater transport pipes 16.

FIGS. 4 and 5 show an embodiment of the marine reclamation method in the case where there is no land near the reclamation sea area and there are no reefs or islands that can be used as unloading sites for sea sand. The sea sand storage base in the present embodiment includes a plurality of concrete pillars 24 constructed on the seabed at a water depth of about 5 to 6 m.
And a floater 26 of about 100 m each provided at a portion projecting from the sea surface between the pillars 24, 24,
It comprises a waterproof curtain 28 made of vinyl attached to a pillar 24 and a floater 26. The waterproof curtain 28 has a bag shape, and the sea sand pumped out from the large bulk carrier 10 is
It is temporarily stored in the bag-like waterproof curtain 28. The waterproof curtain 28 is large enough to reach the bottom of the sea, and the waterproof curtain 28 is prevented from being damaged or torn by the weight of the sea sand. After the work in the landfill area is completed, the sea sand storage base will be disassembled and removed. A plurality of floater transport pipes 16 are moored to the pillars 24 of the sea sand storage base, and the large bulk carriers 10 arriving at the berth place each use the floater transport pipes 16 to move to the sea sand storage base at sea. Pump out the sand.

FIG. 6 shows an embodiment of an ocean reclamation method using a ship as a sea sand storage base. When there is no land, reef or island in the reclamation sea area, and there is no shallow enough to construct an artificial sea sand storage base, it is preferable to anchor the sea sand storage vessel 32 near the reclamation sea area. In addition, by using the sea sand storage vessel 32, changes in the surrounding natural environment can be minimized and the ocean can be reclaimed.
In this embodiment, first, a large sea sand storage vessel 32 is anchored near the landfill sea area. The sea sand storage vessel 32 has a larger drainage amount, that is, a larger load of sea sand, than the large bulk carrier 10 that transports sea sand, and concentrates and stores the sea sand transported by the plurality of large bulk carriers 10. I do. By doing this,
The transport efficiency of the large bulk carrier 10 can be improved. However, by anchoring a plurality of sea sand storage vessels 32 near the landfill sea area, more sea sand can be stored.

The sea sand unloaded to the land 14, the sea sand storage base or the sea sand storage ship 32 is thrown into the landfill sea area at the forefront by a small barge ship 30, as shown in FIGS. The small barge ship 30 is provided with a hold for loading sea sand, and equipment for putting the sea sand in the hold into a landfill sea area at a forefront, for example, a crane. The sea sand is loaded on the small barge ship 30 by a pump from a land, a sea sand storage base or a sea sand storage ship. Thereafter, the small barge ship 30 sails to the landfill sea area. Then, using a crane, the sea sand in the hold is injected into the landfill sea area. A reclaimed land is formed in a predetermined landfill sea area by repeating loading and loading operations.

[0021]

As described in detail above, the present invention secures a land or sea sand storage base near a landfill sea area, and first pumps out sea sand from a large bulk carrier to make a land or sea sand storage base. All sea sand can be unloaded near the landfill area more quickly than when using a large bulk carrier to reclaim land or transfer from a large bulk carrier to another ship. .
Therefore, large bulk carriers do not need to be berthed near the landfill area for a long period of time, and large bulk carriers can be efficiently navigated to transport sea sand with a small number of ships. Work can be completed.

Further, since the place where the sea sand is pumped out from the large bulk carrier is not the sea but the land or the sea sand storage base, even if the sea sand is pumped out quickly and in large quantities, the area around the landfill sea area can be pumped out. It does not cause marine pollution, has little adverse effect on the ecosystem, and can proceed with landfill work.

The second aspect of the present invention is suitable when there is no land near the landfill sea area.

The third aspect of the present invention is suitable when there is no landform near the landfill sea area such as land, rocky reef or island rising from the sea surface.

The invention of claim 4 is suitable when the landfill sea area has no land, reef or island, and there is no shallow enough to construct an artificial sea sand storage base.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a dredging process of sea sand by a large bulk carrier.

[Fig. 2] After unloading sea sand from a large bulk carrier to land,
The figure which shows the method of loading sea sand on a small barge ship and reclaiming the ocean.

FIG. 3 is a diagram showing a method of unloading sea sand from a large bulk carrier to a sea sand storage base on an island and then loading the sea sand on a small barge ship to reclaim the ocean.

FIG. 4 is a perspective view of an artificially constructed sea sand storage base.

FIG. 5 is a diagram showing a method of unloading sea sand from a large bulk carrier to an artificially constructed sea sand storage base and then loading the sea sand on a small barge ship to reclaim the ocean.

FIG. 6 is a diagram illustrating a method of unloading sea sand from a large bulk carrier to a sea sand storage ship and then loading the sea sand on a small barge ship to reclaim the ocean.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Large bulk carrier 12 Tank 14 Land 16 Floater transport pipe 18 Floater 20 Transport pipe 22 Island 24 Pillar 26 Floater 28 Waterproof curtain 30 Small barge ship 32 Sea sand storage ship

Claims (4)

(57) [Claims] 1. A process for transporting sea sand to a landfill sea area by a large bulk carrier, and pumping out sea sand from the large bulk carrier to the land via a floater transport pipe without berthing the large bulk carrier. An ocean reclamation method comprising the steps of: loading sea sand from a land area onto a plurality of small barge ships; and navigating the small barge ships and putting sea sand from the small barge ships into landfill sea areas. 2. A step of providing a sea sand storage base by cutting at least a part of a rocky reef or an island near a landfill sea area, a step of transporting sea sand to a vicinity of the sea sand storage base by a large bulk carrier, Pumping sea sand from a large bulk carrier to a sea sand storage base via a floater transport pipe without letting the ship berth at the sea sand storage base, and transferring sea sand from the sea sand storage base to multiple small barge ships An ocean reclamation method comprising the steps of loading, and navigating a small barge ship and putting sea sand from the small barge ship into the landfill area. 3. A step of forming a sea sand storage base erected from the sea floor near the landfill sea area and isolated from seawater; a step of transporting sea sand to the vicinity of the sea sand storage base by a large bulk carrier; Pumping sea sand from the cargo ship to the sea sand storage base, loading sea sand from the sea sand storage base to multiple small barge ships, and navigating the small barge ship to the landfill area from the small barge ship An ocean reclamation method consisting of a process of charging sea sand. 4. A process for transporting sea sand to a nearby landfill sea area using a large bulk carrier, a step for anchoring a sea sand storage vessel with a larger amount of drainage than the large bulk carrier near the landfill sea area, Transferring sea sand to a sand storage ship, loading sea sand from a sea sand storage ship to multiple small barge ships, navigating a small barge ship, and inputting sea sand from the small barge ship to landfill waters Offshore landfill method.