JPS6088694A - Method for storing materials on the shallow seabed that are unsuitable for storage on land - Google Patents

Abstract

PURPOSE:To economically store a large amount of industrial waste products, by providing such a method that drum cans, etc. in which industrial waste products are charged is laid on a barge water-tightly formed, and the burge is floated up by controlling water charge and discharge valves, then towed to a predetermined sea area, and thereafter sunked onto a shallow sea bottom. CONSTITUTION:Substances which are unpreferable to be stored on land are charged into unit containers such as, for example, drum cans that are high- strengthening, sealable and pressure-resistable. The large number of the unit containers charged with the substances are laid on a barge water-tightly formed with vertical partition walls 1, horizontal floor 2, etc. Further, after the barge being towed to a predetermined sea area by controlling charge and discharge valves 23, 24 and a pump 25, water is filled into the barge which is therefore sunk and bottomed on a shallow sea bottom such as, for example, a continental shelf having a stable sea bottom foundation 27. With this method the storage of a large amount per predetermined unit amount may be economically made.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is directed to storing materials that are not suitable for storage on land, such as industrial by-products, industrial waste, mineral resources, or other materials on shallow seabeds such as continental shelves. It's about how to store it.

[Prior art]

As mentioned above, a method for storing substances that are not suitable for storage on land is to enclose them in unit containers such as drums, and then dump many of the unit containers into the deep sea and store them on the seabed. However, with this method, a large number of unit containers must be loaded onto a ship and transported to the destination area, and then each unit container must be placed into the sea individually, which reduces storage work. It is complicated, and if the above-mentioned substances are to be recovered in some cases, each unit container must be pulled up from the deep seabed, which makes recovery work difficult.
Furthermore, the recovery efficiency is poor, and furthermore, if for some reason the above-mentioned substances leak out of the unit containers while they remain on the seabed, there is a problem of contaminating the marine environment.

[Object and structure of the invention]

The purpose of the present invention is to advantageously solve the above-mentioned problems, and the gist of the present invention is to provide materials that are not suitable for storage on land in strong unit containers with airtightness and pressure resistance, such as drums. After enclosing the substance and loading a large quantity of the substance-enclosed unit containers into submerged parts that can be floated and towed, the submerged purge is floated and towed to a predetermined location, and then water is poured into the submerged purge to cause it to settle. The present invention provides a method for storing materials on a shallow seabed for which storage on land is not preferable, characterized in that the purge is deposited on a shallow seabed such as a continental shelf having stable seabed ground.

〔Example〕

The present invention will be explained in detail by way of illustrated examples. FIGS. 1 to 6 are plan views of an example of a submerged purge.

A-A' vertical sectional view and B-, B' vertical sectional view are shown. Its dimensions are approximately 12 meters in total height, approximately 40 meters in total, and approximately 96 meters in total length, and it can carry around 500 people and around 60,000 drums. The submerged parts in the illustrated example are divided into 8 sections υ11. It is divided into six layers in the vertical direction, and a watertight cover 4 is provided in the center of each layer.
In the middle layer at the bottom of each 71 hive, there is a non-watertight movable floor slab 5 approximately the same size as the hive, and the girders 6 (
(See Figure 4). Figure 4 shows the beam arrangement of the floor slab in the middle of the two squares at the purge end, and the stiffening rib 8 of one part of the bulkhead.
5 is an enlarged view of the right half of FIG. 3, which is a vertical sectional view of FIG. 1.

As shown in FIG. 5, the drums 9 are stacked in six tiers in each layer, leaving a passage space under the hatch.

The bottom plate 10 has a steel plate 11 on the inside and a reinforced concrete IJ on the outside.
- Watertightness, rigidity, and
Ensures seawater corrosion resistance.

The floor slabs 2 of each intermediate floor are made of reinforced concrete and cleats to support the steel girders 6, 7, and small beams 9. Except for the floor slab 2 of the middle floor, they are the main structure of the purge. A certain deck15.
No border 6. Side wall 16. The bulkhead 1 is assembled by processing steel plates, and together with the watertight cover 4, the entire part is kept watertight.

Next, we will explain how to use a submerged purge with such a shape and structure to store materials that are unsuitable for storage on land (hereinafter simply referred to as storage materials), such as large drums 9, on the shallow seabed. .

First, as shown in FIG.
Truck crane 19. 20 forklifts and special loading equipment are used to stack the materials in ψ stages on the floor slabs 2 and bottom slabs 10 of each layer in the purge. At this time, since it is not efficient to handle the drums 9 one by one, a plurality of drums 9 are moved horizontally using a pallet 21, as shown in FIG.

It is more efficient to handle cargo in both directions at the same time.

Furthermore, increasing the size of the drum cans 9 and reducing the number of drum cans also contributes to reducing cargo handling and drum can costs.

During this cargo handling, the hatch cover 4 and movable floor slab 5 are removed or attached as necessary. If the plan is to re-float the submerged parts 1B and re-accommodate the drums 9, the space directly below the hatch 6 needs to be left as a space for the forklift 20 or the like to start work without stacking the drums 9.

After the drums 9 have been loaded in the manner illustrated in FIG. 7, the drums 9 are properly secured to the purge body or the like to prevent them from collapsing due to the shaking and tilting of the submerged purge 18 caused by waves, etc. After inserting a sealing material such as a synthetic rubber gasket between the hatch 6 and the hatch cover 4, the cover 4 is fastened to the hatch B with bolts or the like to ensure watertightness. secure.

In this state, the submerged part 18 is taken off shore from the quay 17, floated to the planned landing point, and then towed. At this time, submerged purge 1
8 is a calculation of the displacement assumed in the design, its own weight, and the live load 9
Bring the top part out above sea level at the appropriate depth. In the illustrated case, the cross section has a relatively large height-to-width ratio in consideration of economical water depth of the loading quay, stability during towing, ground pressure at N bottom, etc.

Navigation to the scheduled location may be determined depending on the navigation conditions, either by towing with a towline or by pushing. Depending on navigational needs, the planar shape of the submerged purge 18 does not necessarily have to be limited to a rectangular shape, but may be triangular or triangular. It is a matter of detailed design to provide a bow deck, a concave rear part for the Zotzscher tub, etc. while considering the balance between construction cost and navigation cost. Furthermore, since the hatch 6 is watertightly sealed by the hatch cover 4 during navigation, the safety of the submerged part 18 during navigation is much higher than when the hatch 6 is open.

As shown in FIG. 8, the ship sails to the planned installation location, leaving some dry Bh on the sea surface 22 without injecting water into the interior. The proposed installation site should be located in a sea area where the ocean floor is generally flat, has the required bearing capacity, has small seafloor currents, and is preferably facing away from shore9, with the longest imaginable wavelength. However, if local unevenness or weak areas are unavoidable, the seabed should be flattened, the ground improved, etc., and the submerged part 18 When the water injection valve 26 for each section is opened, the internal pressure of the submerged parts 18 is 1 atmosphere, so the seawater pressure P1 at the water depth of the water injection valve 26 is higher than the internal pressure by the water pressure due to the water depth, so the seawater is absorbed by the internal air. It penetrates inside while compressing it to the top. Depending on the seawater pressure P1, the air in the upper part of the interior is compressed until it becomes equal to the seawater pressure P1.

Along with this compression, the displacement of the entire submerged purge 18 decreases, and when the amount of decrease exceeds the freeboard capacity of the submerged barge 18,
The submerged purge 18 sinks below the sea surface 22, and as it sinks, the air is further compressed, the amount of drainage decreases, and the sedimentation speed increases.

At this time, if the sedimentation speed exceeds a certain speed, the position and other controls become difficult, so the water injection valve 26 is automatically adjusted to the required degree of opening when a certain sedimentation speed is reached after the start of sedimentation.

If the entire submerged barge 18 tilts due to some uneven loading, the water injection valve 26 is automatically adjusted for each section W0 according to the display on the inclinometer to correct the problem.

In this way, while controlling 1 lilJ, the submerged purge 18 is allowed to sink at a constant speed or less until it reaches the shallow seabed 27 and lands on the bottom, and the water injection valve 26 is closed. Even if there are some irregularities in the shallow seabed 27, the bottom slab 10 is thicker than the other slabs 2 and side walls 16, as shown in FIG.
Generally, due to its high rigidity, the shallow seabed 27 is deformed and comes into close contact with the shallow seabed 27, as shown in FIG. In addition, the rectangle 26 protruding around the bottom plate 1o is placed on the shallow seabed 27 before the bottom plate 10 hits the bottom.
The blade is pressed into the shallow seabed 27 by making use of the high pressure of the cutting edge applied to the small bottom area.

This rectangle 26 effectively works to prevent the area around the bottom slab 10 from being scoured by ocean floor currents and to prevent the main body from skidding 9 in the event of a huge earthquake. Note that the rectangle 26 is not necessary when the shallow seabed 27 is made of rock.

As shown in Figure 10, the inside of the main body, which has reached the bottom at a predetermined position after water injection and sedimentation and bottom edge harvesting as described above, is compressed and reduced in volume to a pressure that balances the water pressure at that depth. Ru. For example, if the water depth is 150 meters, the water pressure will be about 16 atmospheres, so the volume of air will decrease to about 14. External water pressure, internal water pressure. Since the atmospheric pressure is automatically balanced, there is no pressure difference between the inside and outside of the body, so submerged purge 1
The 8-degree frame does not need to withstand enormous pressure due to the depth of the water; it only needs to have enough strength to withstand the external forces during navigation, and compared to non-water injection type submarines that are sunk at a depth of 100 to 200 meters. It is much more economical to build.

If the submerged part 18 that has landed on the bottom in this way is left with the water injection valve 2 closed, the seawater inside the submerged part 18 will be cut off from the seawater outside, and in the unlikely event that the stored materials are stored inside the submerged purge. Even if leakage occurs, there is no risk of it flowing out to the outside of the submerged purge, and compared to the case where the storage substance-filled drum 9 is directly put into the shallow seabed for storage, there is no risk of contaminating the marine environment and safety is high.

During storage, leakage detection monitors are installed inside and outside of submerged part 1B to confirm the safety of storage conditions, and to notify other vessels of the submerged position to prevent damage to fishing nets, etc. , buoy, ultrasonic transmitter, etc. Purge 1
Set it at 8.

The durability of the submerged purge 18 is determined by taking into account the properties of the stored substance sealed in the drum can 9, the corrosion resistance of the drum can 9 in seawater during the storage period, the reusability of the barge body, etc., but the durability is approximately 50 years. As for the target level, the steel parts should be made of seawater resistant steel, with heavy anti-corrosion coating and electrolytic corrosion protection, and the concrete parts should be reinforced with fibers to prevent cracks, and if necessary, waterproofing should be applied. With plastic coating, etc., the goal can be fully achieved.

If it becomes necessary to re-float and move the submerged purge 18, open the drain valve 24 and operate the drain pump 25 to gradually drain the seawater inside the submerged barge 18, increasing the overall displacement and draining the entire submerged purge 18. will resurface. The resurfaced submerged parts 18 can be loaded by the reverse procedure of sailing to the submerged site and routed to the quay for necessary treatment.

The shallow seabed storage method of the present invention can also be applied to cases where a substance is no longer needed after long-term or short-term storage and is disposed of.

〔Effect of the invention〕

Although the method according to the present invention has been explained above by giving examples, the advantages of the present invention can be summarized as follows.

(1) It is more economical than constructing an underground cavity and storing it there. It is still possible to store in fixed quantities, and the storage cost per unit i hardly changes and is almost proportional to the storage amount, regardless of the number of units stored or the number of storage times. It is economical because it only costs tacos.

(2) Compared to deep seabed storage, the water pressure is 1/20
~1.4 If the damage is about 1.4, the pressure resistance of the container is low, making it economical, and since it is submerged on the shallow seabed, monitoring, inspection, and relocation are possible, making it highly adaptable to changes in storage conditions. , and more easily accepted socially. In addition, compared to the case where unit containers are directly thrown into the sea for storage, a large amount of storage material can be deposited at the required %IN at one time, and a large amount of storage material can be recovered at the same time. Furthermore, since it has a double structure of a submerged purge and a container, it is much safer than the case where containers are directly put into the sea for storage. , unavoidable natural disasters on land (earthquakes, 2 typhoons, floods).

Mountain collapses, avalanches, etc.) can be easily avoided on land, and it is highly safe on land.

(4) Although the submerged parts are placed on the seabed at a depth of 10 to 200 meters, the internal and external pressures (water pressure, atmospheric pressure) are automatically balanced even when the parts are on the bottom. Therefore, there is no need for a large pressure resistance like that of a submarine, and the construction cost is economical because the structure has the same strength as a sea-going ship.

[Brief explanation of drawings]

Figure 1 is a top view of the submerged parts, Figure 2 is its longitudinal and vertical cross-sectional view, Figure 6 is its width vertical cross-sectional mf diagram, and Figure 4 is a recommendation for the submerged parts (floor beam plan of the middle floor of the county, Figure 5 is a vertical cross-sectional view in the width direction of section 1 of the submerged parts, Figure 6 is a sketch of drums stacked on pallets, Figure 7 is a sketch of the loading status of drums on the quay to the submerged barge, and Figure 8 is a diagram of the loading status of drums on the quay to the submerged barge. A sketch of the submerged parts fully loaded and floating with the hatch cover closed. Figure 9 is a sketch of the submerged parts being filled with water and sinking into the sea. Figure 10 is a sketch of the submerged purge having reached the bottom of the sea. 1 to 10 are drawings based on the embodiments of the present invention. In the figures, 1 is a vertical partition, 2 is a horizontal floor slab, 6 is a hatch, and 4 is a hatch. Cover, 5 is a movable floor slab, 6 is a large beam on the same side as the hatch, 7 is a general beam, 8 is an interpolation rib, 9 is a drum, 1o is a bottom slab, 11 is a copper plate, 12 is reinforced concrete, 13 is a small beam, 14 is a steel pipe column, 15 is a deck, 16 is a side wall, 17 is a quay, 18 is a submerged purge, 19 is a truck crane, 20 is a forklift, 21 is a pallet,
22 is the sea level, 23 is the water injection valve, 24 is the drain valve, 2
5 indicates a drainage pump, 26 indicates a square shape, 27 indicates a freeboard. Procedural amendment (voluntary) November 29, 1980 Kazuo Wakasugi, Commissioner of the Japan Patent Office 1. Indication of the case Patent Application No. 195192 filed in 1988 2. Name of the invention Method for storing substances on shallow seabed for which storage on land is undesirable 3 , Relationship with the person making the amendment Patent applicant name (665) Nippon Steel Corporation 5. Specification subject to amendment (1) Correct "tab" in line 6 of page 7 of the specification to "tag" . Agent Minoru Abe

Claims (1)

[Claims] Substances that are unsuitable for storage on land are sealed in strong, airtight, pressure-resistant unit containers such as drums, and a large quantity of the substance-enclosed unit containers are loaded into a submerged purge that can be floated and towed. The purge is floated and towed to a designated location.
Next, water is poured into the submerged purge to cause it to settle, and the submerged purge is deposited on a shallow seabed, such as a continental shelf that has a stable submarine shield. Storage method.