JP3173433U - Reinforced concrete square storage container for radioactive contaminants - Google Patents

Abstract

An inexpensive reinforced concrete square storage container for storing a large amount of radioactive contaminants with attached radioactivity in a temporary or short to medium term is provided.
A reinforced concrete rectangular storage container having a storage space volume of 1 m ³ or more, wherein a container body made of reinforced concrete is covered with a top opening formed by integrally forming a bottom portion and a side wall portion, and the opening is covered. A plurality of connecting plates for fixing the lid to the container main body by fixing with bolts to the reinforced concrete lid body and the insert embedded in the outer surface of the side wall portion of the container main body and the side surface of the lid body. Each minimum thickness of the bottom part, the side wall part, and the lid in the container body is 13 to 18 cm.
[Selection] Figure 1

Description

  The present invention is a reinforced concrete for temporarily or short-to-medium-term storage of radioactive pollutants such as sludge contaminated by radiation exposure, incinerated ash obtained by incineration of the sludge, earth and sand, and earthquake debris. The present invention relates to a square storage container.

  The Fukushima Daiichi nuclear power plant accident that originated in the Great East Japan Earthquake has caused serious damage to radioactive materials (radioactivity) such as radioactive cesium, radioactive iodine, and radioactive strontium scattered throughout Japan. The radioactive material is carried by the wind and deposited on various materials such as soil surfaces, earthquake debris, plants, rice straw, etc., or contaminated with rainwater and flows into sewer pipes to incinerate sludge from the sewage treatment facility and the sludge A large amount of various radioactive pollutants are produced by mixing in the incinerated ash obtained by processing.

  However, the fact is that no effective method for treating these radioactive pollutants generated in large quantities has been found. For example, radioactively contaminated soil such as a schoolyard is processed by scraping off the surface soil containing the radioactive pollutant and placing the scraped surface soil on the corner of the schoolyard in piles as an emergency measure. In addition, sludge and incinerated ash are usually collected by cement manufacturers as cement raw materials, but they do not provide clear standards for the government to dispose of radioactively contaminated materials, and cement manufacturers refuse to accept them. is doing.

  Accordingly, radioactively contaminated sludge and incineration ash that have nowhere to go are placed in a flexible container bag and covered with a sheet as an emergency measure, and left at the wall of the passage. However, treatment with this method is approaching its limit, and radiation protection and shielding are insufficient, so anxiety is spreading among workers, nearby residents, and other related parties.

  On the other hand, containers for treating radioactive waste generated in nuclear power processing facilities such as nuclear power plants have been considered, and steel cylindrical containers such as canisters and drums, steel square containers, lightweight There are various materials and structures such as square PIC containers and concrete containers.

  Examples of concrete square containers include those shown in Patent Document 1 and Patent Document 2. The thing of patent document 1 is a comparatively small concrete container with high durability, and is a cured product of a composition containing at least cement, pozzolanic fine powder, fine aggregate having a particle diameter of 2 mm or less, a water reducing agent, and water. It consists of

  In addition, the one of Patent Document 2 has a waste storage space and a concrete container main body having a substantially rectangular parallelepiped shape, and a lower surface of the container main body integrated with the container main body. The concrete leg part provided in concrete is comprised, and it is comprised so that the impact force which acts at the time of a fall may be absorbed when the said leg part is damaged.

JP 2004-315306 A JP-A-10-297703

  As mentioned above, there is no storage container that can process radioactive pollutants such as radioactive soil contaminated with radioactive substances (radioactivity), radioactive polluted sludge, incinerated ash, etc. at low cost, so it is almost in the field. ing. There are containers for processing various radioactive wastes generated at nuclear-related processing facilities, but they are small in size and have a small storage capacity, or have a structure for storing high-level radioactive waste such as spent nuclear fuel and high-level liquid waste. It is complicated and expensive, and the radioactive contaminants cannot be processed in large quantities at low cost.

  Although the thing of patent document 1 uses fibers, such as pozzolanic fine powder and carbon fiber, although it is highly durable, manufacturing cost becomes high and it is not suitable for mass-producing a large sized container. Since the thing of patent document 2 also provides a leg part and uses carbon fiber as a reinforcing material, manufacturing cost becomes high and is not suitable for mass-producing a large sized container. In addition, no consideration is given to the storage of radioactive pollutants.

  As the Fukushima Daiichi nuclear power plant accident has not been anticipated so far, a large amount of radioactive contaminants will be generated due to radioactive exposure due to the scattering of radioactive materials (radioactivity). There is no inexpensive container for storing radioactive pollutants either temporarily or in the short to medium term in order to protect themselves from the damage caused by these radioactive pollutants.

  The present invention is intended to solve the above-described problems, and provides an inexpensive reinforced concrete rectangular storage container for temporarily or short-to-medium-term storage of a large amount of radioactive contaminants generated from radioactive materials. The purpose is to do.

The invention according to claim 1 is a reinforced concrete square storage container having a storage space volume of 1 m ³ or more for storing radioactive pollutants temporarily or in the short to medium term. A container body made of reinforced concrete with an upper surface opening formed integrally, a reinforced concrete lid body for covering the opening, and a plurality of connecting plates for fixing the lid body to the container body. Reinforced concrete square-shaped storage container characterized in that the minimum thickness of the bottom, side wall, and lid of each is 13 to 18 cm.

  The reinforced concrete square storage container of the present invention is a dedicated container for storing radioactive pollutants temporarily or in the short to medium term. Temporary is less than one year and short to medium term is about 1 to 20 years. After storage, dispose of it at the final disposal facility or take out radioactive pollutants and reprocess them at the reprocessing facility for reuse.

  The radioactive pollutant referred to in the present invention means sludge contaminated with radioactive materials such as radioactive cesium, radioactive iodine, and radioactive strontium diffused by accidents at nuclear facilities such as nuclear power plants, and incineration of the sludge. Secondary radioactive materials such as incinerated ash, earth and sand, earthquake debris, and vegetation.

  The reason why the container is made of reinforced concrete is that it is possible to mass-produce an inexpensive and durable large container that can process the radioactive pollutants in large quantities. The reason why the shape of the container is limited to a square shape is that the rectangular container is easier to stack and store at the storage location.

  The container may be made of bare reinforced concrete with the concrete surface exposed, but it has a watertight structure where the concrete surface of the container body or lid is waterproofed or waterproofed between the container body and the lid. It is good also as a container. The square storage container made of reinforced concrete according to the present invention includes both of them.

  Waterproofing treatment on the concrete surface of the container body and lid is, for example, adhesion of sheet waterproofing material such as rubber sheet, PVC sheet or polyethylene sheet, waterproofing film material such as urethane paint or epoxy paint, polymer cement mortar, asphalt waterproofing Covering with a material or the like. Further, the waterproofing treatment between the container main body and the lid body is, for example, mounting between the container main body and the lid body such as a water stop member such as a rubber plate or a string-like seal member.

The square storage container made of reinforced concrete according to the present invention is a large container having a storage space volume of 1 m ³ or more. Radioactive contaminated soil and radioactive contaminated sludge contaminated with radioactive substances (radioactive substances) are generated in large quantities, so they cannot be treated efficiently and inexpensively with small to medium-sized containers used for conventional radioactive waste treatment. .

  The square storage container made of reinforced concrete according to the present invention includes a container body made of reinforced concrete with a top opening formed by integrally molding a bottom portion and a side wall portion, a reinforced concrete lid body for covering the opening, and the lid body. A plurality of connecting plates are provided for fixing to the main body. The container body is strong because the bottom and side walls made of reinforced concrete are integrally formed. The lid is made by the weight of the lid made of reinforced concrete and is fixed to the container body by a connecting plate.

  On the back side of the lid (the side facing the opening of the container main body), it is preferable to provide a guide projection for smoothly and reliably installing the lid on the container main body. This guide convex portion is an outer dimension that fits in the upper part of the opening of the container body with almost no clearance, has a thickness of about 1 to 5 cm, and is formed integrally with the container body.

  The connecting plate is attached across the upper outer surface of the side wall of the container body from the side surface of the lid, and is fixed by a bolt or the like. Therefore, an insert for attaching a bolt or the like is provided on the side surface of the lid and the upper outer surface of the side wall. The material of the connecting plate is not particularly limited as long as it is easy to process and inexpensive and durable. Usually it is made of metal.

  The square storage container made of reinforced concrete according to the present invention is a thick container, and the minimum thickness of the bottom and side walls and the lid of the container main body is 13 to 18 cm. The minimum thickness means, for example, the thickness of the thinnest part when the thickness is different between the outer peripheral portion and the central portion of the lid. The minimum thickness is 13-18 cm. If it is less than 13 cm, it is difficult to arrange the bars, and it is difficult to make a highly durable container with high radiation shielding performance. If it exceeds 18 cm, it becomes too heavy and difficult to handle, resulting in high costs. A more preferable thickness is 14 to 16 cm.

  The invention according to claim 2 is the reinforced concrete according to claim 1, wherein guide convex portions serving as guides for stacking a plurality of container main bodies are provided on the outer surface of the bottom of the container main body. It is a “square-shaped storage container”.

  The square storage container made of reinforced concrete according to claim 2 is devised on the assumption that a plurality of containers are efficiently stacked and stored in a small site area, and the outer surface of the bottom of the container body A guide convex portion is provided as a guide when the plurality of container main bodies are smoothly and reliably stacked. The guide protrusion is made of concrete and is integrally formed with the container body. The dimensions of the guide protrusions are the same as the guide protrusions provided on the back surface of the lid as necessary.

  The invention according to claim 3 is as follows: “At least one outer surface of the side wall portion of the container main body has a concavo-convex shape with a central portion recessed in a band shape. It is a “square storage container”.

  The square storage container made of reinforced concrete according to claim 3 is also devised on the assumption that a plurality of containers are efficiently stacked and stored, and at least one outer surface of the side wall portion of the container body is provided. The central portion has a concave-convex shape with a band shape. The reason for this shape is to prevent rattling from occurring when the heads of the bolts that attach the fastening bands for connecting and fixing the container bodies to the container body protrude and the containers are arranged. Therefore, the dent may be such that the head of the bolt protrudes from the outer surface of the side wall.

  The invention according to claim 4 is characterized in that “an insert for attaching a fastening band for connecting and fixing the container main bodies to each other is provided on at least one outer surface of the side wall portion of the main body container. 3. A reinforced concrete square storage container according to any one of 3).

  When storing many reinforced concrete square storage containers of the present invention in one place, if each container can be individually placed flat, there is no need to connect and fix the container bodies with fastening bands, but a laminated structure arranged vertically and horizontally When the body is constituted, it is preferable to connect and fix with a fastening band for safety. Therefore, it is preferable that an insert for attaching a fastening band for connecting and fixing the container main bodies to each other is provided on at least one outer surface of the side wall portion of each main body container, assuming a case where a laminated structure is configured.

The invention according to claim 5 is as follows: “The concrete in the reinforced concrete is ordinary concrete or heavy concrete having a density of 2.3 t / m ³ or more, and is made of reinforced concrete according to any one of claims 1 to 4. It is a “square storage container”.

The concrete used for the reinforced concrete square storage container of the present invention is not particularly limited as long as it is a concrete generally used in the field of civil engineering and construction, but from the viewpoint of cost, ordinary concrete has a radiation shielding performance. From the aspect, heavy concrete using heavy aggregate is preferable. Heavy aggregates are high specific gravity aggregates conventionally used as concrete aggregates such as iron ore and barite. Moreover, since the shielding performance of radioactivity is better when the density of the concrete is higher, it is preferably at least 2.3 t / m ³ or more. In the case of heavy concrete, a density of 3.0 to 5.0 t / m ³ is preferable.

  The invention according to claim 6 is a laminated structure of reinforced concrete square storage containers using the reinforced concrete square storage container according to claim 2, wherein the container body of the reinforced concrete square storage container is “Laminated structure of reinforced concrete square storage container” in which a plurality of stages are stacked such that the guide convex part fits into the upper part of the opening of the container body, and the opening of the uppermost container body is covered with the lid.

  When storing a large number of reinforced concrete square storage containers of the present invention in a storage place with a small site area, it is preferable to have a stacked structure in which the containers are stacked in multiple stages. In this stacked structure, the bottom of the upper container body is the lower container. Since it serves as a lid for the main body, it is not always necessary to provide a lid for each container, but only a lid for covering the opening of the uppermost container body. With such a laminated structure, the number of necessary lids can be reduced, so that the lamination can be performed efficiently and the cost can be reduced.

  Further, as described above, since the bottom of the container body serves as a lid, it is preferable to use the reinforced concrete square storage container according to claim 2. If this container is used, the guide protrusions provided on the outer surface of the bottom of the container body may be stacked so as to fit in the upper part of the opening of the container body directly below, so that lamination is easy and reliable, and a stable laminated structure is obtained.

  In addition, it is preferable to perform the process similar to the waterproof process between the said container main body and a cover body between the said guide convex part and the opening upper part of the said container main body directly under.

  The invention according to claim 7 is a claim using a reinforced concrete square storage container in which at least one outer surface of the side wall portion of the container body according to claim 3 has a concave-convex shape with a central portion recessed in a band shape. The laminated structure of reinforced concrete square storage containers according to Item 4, wherein a plurality of the reinforced concrete square storage containers are placed sideways in a state where the corner outer surfaces of the side walls of the container body are in contact with each other. Line up and connect adjacent container bodies with fastening bands, stack multiple layers of the same structure in the height direction, and fasten the container bodies of each reinforced concrete square storage container placed in the height direction “Laminated structure of square storage container made of reinforced concrete that is connected and fixed with a band”.

  As described above, the rectangular storage container made of reinforced concrete according to claim 3 was devised on the assumption that a plurality of containers are stacked and stored efficiently and reliably, and therefore this container can be used. preferable. In addition, the container bodies are connected and fixed with a fastening band so that the laminated structure does not collapse greatly due to an earthquake or the like. For this reason, a reinforced concrete square storage container according to claim 3 provided with the insert according to claim 4 is used.

  Laminate structure is a horizontal storage of a plurality of reinforced concrete square storage containers with the lids in contact with the corners of the side walls of the container body, and the adjacent container bodies are connected and fixed with fastening bands. In this structure, a plurality of layers of the above structure are stacked in the height direction, and the container main bodies of each reinforced concrete square-shaped storage container placed in the height direction are connected and fixed by a fastening band. The fastening band is a plate or sheet having a hole through which a bolt passes, and is not particularly limited as long as it is made of a strong and durable material. Materials such as metal and carbon fiber can be used.

  If the reinforced concrete square storage container of the present invention is used, even if a large amount of radioactive pollutant is generated, it can be immediately transferred and stored temporarily or in a short to medium term at a predetermined place. Workers in the location where the pollutant is generated and nearby residents can prevent radiation exposure caused by the radioactive pollutant for the time being. In addition, the square storage container made of reinforced concrete according to the present invention has a simple structure made of ordinary reinforced concrete and can be supplied in large quantities at a low cost.

It is the schematic of the square container made from a reinforced concrete based on this invention, (a) is the installation image figure to the container main body of a cover, (b) is a hanging image figure of a container. It is the schematic of the container main body in the square container made from reinforced concrete concerning this invention, (a) is a top view, (b) is a side view. It is the schematic of the cover body in the rectangular container made from a reinforced concrete concerning this invention, (a) is a top view, (b) is a side view. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows an example of the connection structure of the cover body and container main body in the reinforced concrete square container which concerns on this invention, (a) is sectional drawing which shows the outline of a structure, (b) is a figure which shows an example of a connection plate. It is. It is sectional drawing which shows the other example of the connection structure of the cover body and container main body in the square container made from reinforced concrete concerning this invention, (a) is an example which provided the level | step difference, (b) is an example of the fitting by an unevenness | corrugation. It is. It is a figure which shows the bar arrangement example (single bar arrangement) of the reinforcing bar in the reinforced concrete square container which concerns on this invention, (a) is a top view of a container main body, (b) is a side view of a container main body, (c) is The top view of a cover body, (d) is a side view of a cover body. It is a figure which shows an example (a)-(g) of the manufacturing process of the container main body in the square container made from reinforced concrete which concerns on this invention. It is a figure which shows an example (h)-(m) of the manufacturing process of the cover body in the rectangular container made from a reinforced concrete which concerns on this invention. It is a side view of the general laminated structure of the reinforced concrete square container concerning this invention. It is a side view of the laminated structure of the reinforced concrete square container which concerns on this invention which provided the guide convex part in the bottom part outer surface in the container main body. It is a figure which shows the laminated structure which connected and fixed the reinforced concrete square-shaped storage container of this invention which becomes the uneven | corrugated shape in which the center part of the side wall part outer surface in a container main body was dented in strip | belt shape, (a) is a top view (B) is a side view.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

A. Reinforced concrete square container of the present invention
[Container structure]
FIG. 1 is a schematic view of a reinforced concrete rectangular container according to the present invention, in which (a) is an image of installation of a lid on a container body and (b) is an image of hanging of the container.

  As shown to Fig.1 (a), the square container 1 made from reinforced concrete of this invention consists of the container main body 2 and the cover body 3 which are integrally formed, and all are made from reinforced concrete. An insert 4 for attaching the connection plate 6 is provided on the upper side of the container body 2 and the side surface of the lid 3.

  A suspension hole 5 for attaching a lifting tool 7 for hanging the reinforced concrete square container 1 is also provided on the upper side of the container body 2. The suspension hole 5 is also provided on the lid as necessary. (Not shown)

The reason why the container shape is rectangular is that the rectangular container is easier to store in a storage place. Each dimension of length x width x height is not particularly limited as long as the volume of the storage space is 1 m ³ or more. The volume of the storage space for the 1m ³ or more, is a dedicated container for reinforced concrete square-shaped container of the present invention is to temporary or short-medium term storage of radioactive pollutants, large amounts of radioactive contaminants This is because it must be a large container that can be processed.

  As shown in FIG. 1B, the container body 2 and the lid 3 are connected and fixed by a connecting plate 6.

  It is preferable to make the installation location of the connection plate 6 slightly concave so that the heads of the connection plate 6 and the mounting bolts thereof do not protrude from the outer surfaces of the side surfaces of the lid 3 and the container body 2. When the heads of the connecting plate 6 and the mounting bolts thereof protrude, it is difficult to obtain a stable stacked structure of the containers because it is difficult to arrange the containers in close contact when storing the containers. The reinforced concrete rectangular container 1 with the lid is moved by being hung by the hanger 7.

  FIG. 2 is a schematic view of a container body in a reinforced concrete square container according to the present invention, wherein (a) is a plan view and (b) is a side view.

  The container body 2 is made of reinforced concrete 8 and has an opening 9. The side wall is appropriately provided with an insert 4 for attaching the connecting plate and a suspension hole 5 for attaching a hanging tool. The thickness of the side wall and the bottom is 13 to 18 cm. If it is less than 13 cm, it is difficult to arrange the bars, and it is difficult to make a highly durable container with high radiation shielding performance. If it exceeds 18 cm, it becomes too heavy and difficult to handle, resulting in high costs. A more preferable thickness is 14 to 16 cm.

  It is preferable to provide a radiation shielding layer or a waterproof layer on at least one of the inner and outer surfaces of the container. In particular, waterproofing such as sticking waterproof sheets with rubber sheets, PVC sheets, polyethylene sheets, etc., coating with waterproofing films such as urethane paint and epoxy paint, polymer cement mortar, asphalt waterproofing material etc. preferable. (The illustration is omitted) The radioactive pollutant to be stored may be put directly into the storage space 10, but the granular material such as sludge and incineration ash is first put in a flexible container bag or a plastic bag, and this is stored in the storage space 10. It is preferable to put in.

  FIG. 3 is a schematic view of a lid body in a reinforced concrete square container according to the present invention, wherein (a) is a plan view and (b) is a side view.

  The lid 3 is also made of reinforced concrete 8 and has a thickness (minimum thickness) of 13 to 18 cm. An insert 4 for attaching a connecting plate is provided on the side surface. Further, a guide convex portion 11 is integrally formed on the back surface side. By providing the guide projection 11, the installation of the lid 3 on the container body 2 is smooth and reliable. The thickness of the guide protrusion 11 may be about 5 cm.

  As in the case of the container body, it is preferable to provide a radiation shielding layer or a waterproof layer on at least one of the front and back surfaces of the lid. In particular, as in the case of the above container body, waterproofing treatment such as sticking of waterproof sheet such as rubber sheet, polyvinyl chloride sheet, polyethylene sheet, coating waterproofing material such as urethane paint or epoxy paint, coating with polymer cement mortar, asphalt waterproofing material, etc. It is preferable to apply. (Not shown)

  4A and 4B are diagrams showing an example of a connection structure between a lid body and a container body in a reinforced concrete square container according to the present invention, wherein FIG. 4A is a cross-sectional view schematically showing the structure, and FIG. 4B is an example of a connection plate. FIG.

  The lid 3 is installed in such a manner that the guide projection 11 is fitted into the opening 9 of the container body 2, and is connected and fixed to the container body 2 by a connection plate 12. The connecting plate 12 is a metal plate having two insertion holes, a bolt insertion hole (cover body side) 14 and a bolt insertion hole (container body side) 15 having the shape shown in FIG. The lid 3 is connected and fixed by inserting bolts 13 into the inserts 4 provided on the lid 4 and attaching the connecting plate 12 across the lid 3 and the container body 2.

  A watertight structure in which a water stop member 16 is provided between the lid 3 and the container body 2 is preferable. Examples of the water stop member include a natural rubber rubber plate, a string-like seal member made of butyl rubber, chloroprene rubber, or the like, and a sealing material.

  FIG. 5 is a cross-sectional view showing another example of a connecting structure between a lid and a container body in a reinforced concrete rectangular container according to the present invention, (a) is an example in which a step is provided, and (b) is a fitting by unevenness. This is an example.

  The surface where the lid 3 and the container body 2 are in contact with each other may be flat as shown in FIG. 4 (a), but from the viewpoint of water stoppage or the like, as shown in FIG. 5 (a) and FIG. It is preferable to have a formal format. Further, the water stop member may be provided at an appropriate position between them. (Not shown) When the lid 3 is provided with the guide protrusion 11, a natural rubber rubber plate, butyl rubber, chloroprene rubber, or the like is formed on the side surface of the guide protrusion 11 so that the guide protrusion 11 is smoothly fitted into the opening 9. A watertight structure provided with a water-stopping member such as a string-like sealing member and a sealing material may be used. (Not shown)

[Concrete used]
The concrete used for the reinforced concrete square container of the present invention is preferably ordinary concrete or heavy concrete having a density of 2.3 t / m ³ or more. Since radioactive contaminants are generally generated in large quantities, many inexpensive containers are required to process them. However, if concrete is used, manufacturing costs can be reduced, and it becomes easy to supply a large quantity of inexpensive containers.

When the amount of radioactivity from the radioactive pollutant is large, it is preferable to use heavy concrete having high radioactivity shielding properties for safety even if the treatment cost is high. The heavy concrete is a concrete having a density of 3.0 to 5.0 t / m ³ using heavy aggregate made of iron, barite, iron ore or the like having high specific gravity instead of general aggregate. The radioactivity caused by gamma rays and X-rays can be shielded as the density of concrete increases. Even when ordinary concrete is used, the density should be 2.3 t / m ³ or more in consideration of the container dimensions.

  Moreover, the container of this invention is a product made from the reinforced concrete which consists of the said concrete and a reinforcing bar. By using reinforced concrete, the durability of the container is increased and the weight of the container is increased, so that the radiation shielding property is also improved.

  Tables 1 and 2 show examples of blending concrete, and Tables 3 and 4 show the quality and performance of these concretes. Table 1 shows examples of materials used, Table 2 shows blending examples, Table 3 shows fresh properties of concrete, and Table 4 shows physical properties of hardened concrete.

The compressive strength of the concrete is preferably 50 N / mm ² or more at the age of 28 days in standard curing. If necessary, cement admixtures such as silica fume, blast furnace slag, fly ash and the like may be mixed. Moreover, when there is a concern about deterioration due to freezing and thawing of concrete such as in cold districts, an AE agent may be used and AE concrete having an air amount of 3 to 6% may be used.

[Reinforcing bars]
FIG. 6 shows an example of reinforcing bar arrangement (single reinforcing bar arrangement) in a reinforced concrete rectangular container according to the present invention. (A) is a top view of a container main body, (b) is a side view of a container main body, (c) is a top view of a cover body, (d) is a side view of a cover body.

  In the container body 2, the reinforcing bars are composed of main bars 21, distributing bars 22, and hunch bars 23, and are arranged as shown in the figure. It is preferable to use D13 to D25 as the main muscle and D10 to D22 as the distribution muscle. The reinforcing bar pitch is 100 to 250 mm. The type is preferably SD295A or SD345.

  This example is a single bar arrangement, but may be a double bar arrangement if necessary. (Not shown) In the lid 3, the reinforcing bars are composed of the main reinforcing bars 21 and the distributing bars 22 and are arranged as shown in the figure. The type is preferably SD295A or SD345.

[Manufacture of containers]
FIG. 7 shows an example of the manufacturing process of the container body in the reinforced concrete square container according to the present invention. The manufacturing process of a container main body is (a)-(g).

  First, a reinforcing bar is placed, and a mold frame composed of an outer frame and an inner frame is assembled to it (a), and the above-mentioned heavy concrete or ordinary concrete is placed between the outer frame and the inner frame (b). Finish the placement by troweling the bottom. (C) After that, the sheet is covered and steam is injected into the sheet to cure the steam. (D) Demold at an appropriate time after steam curing (e) (f) and invert to obtain a container body. (G) The surface is waterproofed as necessary. (Not shown)

  FIG. 8 shows an example of a manufacturing process of a lid in a reinforced concrete square container according to the present invention. The manufacturing process of a container main body is (h)-(m).

  First, set the formwork and place the reinforcing bars. (H) The above heavy concrete or ordinary concrete is placed (i), and the surface (upper surface of the lid) is troweled to complete the placement. (J) After that, the sheet is covered and steam is injected into the sheet to cure the steam. (K) Demold at an appropriate time after steam curing (l) to obtain a lid. (M) The surface is waterproofed as necessary. (Not shown)

B. Laminated structure of various containers according to the present invention FIG. 9 shows an example (side view) of a general laminated structure of a reinforced concrete rectangular container according to the present invention. The shape of the reinforced concrete square container 1 is slightly flat and vertically long, and the length and width of the container are exactly the size that fits even when the orientation is changed as shown in the figure. In this example, twelve containers are stacked in three stages, and a laminated structure 17 is formed in which the direction of the second stage is changed.

  The lid 3 and the container body 2 are connected and fixed by a connecting plate 6. The connecting plate 6 is attached so as not to protrude from the outer surface of the side wall. In this example, the suspension holes 5 are provided in both the lid 3 and the container body 2. A lifting tool is attached to the suspension hole 5 and moved by being suspended by a forklift or the like, and stacked in such a structure. In addition, for safety, each container may be provided with an insert for a fastening band, and the containers may be connected and fixed with a fastening band. (Not shown, see FIG. 10)

  FIG. 10 is a side view of a laminated structure of a reinforced concrete square container according to the present invention in which guide convex portions are provided on the outer surface of the bottom of the container body.

  The shape and dimensions of the reinforced concrete rectangular container 1 are substantially the same as those in FIG. 9, but the guide convex portion 11 is integrally formed on the bottom outer surface of the container body 2. In this example, it is a laminated structure 17 in which three containers are simply stacked in three stages, but the second container is stacked on the first container without the lid 3 being covered, and the second container is also stacked. A third-stage container is stacked without being covered with the lid 3, and only the third-stage container, which is the uppermost stage, has a laminated structure 17 that is covered with the lid 3.

  The container bodies of the first and second stages are also connected and fixed by the connecting plate 6 in the same manner as the lid 3. In this way, when containers are stacked, the upper container serves as a lid for the lower container, so it is not always necessary to provide a lid for each container depending on the type of stored items. By doing so, it is possible to improve the efficiency of stacking and reduce the processing cost.

  It is to be noted that the same waterproof treatment between the container body and the lid is applied to the place where the container main bodies overlap each other and the upper guide protrusion 11 fits into the opening of the lower container body. preferable. (Not shown)

  FIG. 11 shows a laminated structure in which square-shaped reinforced concrete storage containers of the present invention in which the central part of the outer surface of the side wall of the container body has a concave-convex shape are connected and fixed with a fastening band. (A) is a top view, (b) is a side view.

  The reinforced concrete square storage container 1 of the present invention is a square container having a substantially square plane, and at least one outer surface of the side wall portion of the container body 2 has a concave-convex shape having a strip-shaped recess 20 having a central recess. ing. An insert 18 for attaching a fastening band 19 is provided on the side wall of the container body 2.

  In this example, the container has a laminated structure 17 in which 12 containers are stacked in one row in three rows. Each container is provided with a lid 3, and the container body 2 and the lid 3 are connected and fixed by a connecting plate 6. The connecting plate 6 is attached so as not to protrude from the outer surface of the side wall. Adjacent container bodies 2 in the horizontal direction are connected and fixed by two short fastening bands 19 such that the upper and lower portions of the side wall are in contact with each other. Further, the three container bodies 2 in the vertical direction are connected and fixed by a long fastening band 19.

  The long fastening band 19 is provided at each predetermined position on the front, back and side surfaces of the outer periphery. Thus, by connecting and fixing with the fastening band 19, a strong laminated structure that is strong against vibrations such as earthquakes can be obtained. The fastening band 19 is fixed by attaching the bolt to the insert through the hole of the fastening band 19, but the head of the bolt is located in the belt-like recess 20, so that it does not protrude from the outer surface of the side wall portion of the container body 2. Therefore, the strong laminated structure 17 which made the side wall part of the container main bodies 2 adjacent in the horizontal direction contact stably is obtained.

DESCRIPTION OF SYMBOLS 1 ... Reinforced concrete square container 2 ... Container body 3 ... Cover body 4 ... Insert (for connecting plate)
5 ... Suspension hole 6 ... Connection plate 7 ... Suspension tool 8 ... Reinforced concrete 9 ... Opening 10 ... Storage space 11 ... Guide convex part 12 ... Connection plate 13 ... Bolt 14 ... Bolt insertion hole (lid side)
15 ... Bolt insertion hole (container side)
16 ... Water-stop member 17 ... Laminated structure 18 (of reinforced concrete square container) ... Insert (for fastening band)
19 ... Fastening band 20 ... Band-shaped recess 21 ... Main muscle 22 ... Power distribution muscle 23 ... Haunch muscle

Claims (7)

Reinforced concrete square storage container with a storage space volume of 1 m ³ or more for storing radioactive pollutants temporarily or in the short to medium term, with a top opening formed integrally with the bottom and side walls A container body made of reinforced concrete, a reinforced concrete lid body for covering the opening, and a plurality of connecting plates for fixing the lid body to the container body, comprising a bottom portion, a side wall portion and a lid body of the container body Reinforced concrete square-shaped storage container, wherein each minimum thickness is 13 to 18 cm.   The reinforced concrete square storage container according to claim 1, wherein a guide convex portion serving as a guide for stacking a plurality of container main bodies is provided on an outer surface of a bottom portion of the container main body.   The square storage container made of reinforced concrete according to claim 1 or 2, wherein at least one outer surface of the side wall portion of the container body has an uneven shape with a central portion recessed in a band shape.   The insert for attaching the fastening band which connects and fixes container main bodies is provided in the at least one outer surface of the side wall part in the said main body container, The Claim 1 characterized by the above-mentioned. Reinforced concrete square storage container. The concrete in the reinforced concrete is ordinary concrete or heavy concrete having a density of 2.3 t / m ³ or more, and the square storage container made of reinforced concrete according to any one of claims 1 to 4.   A laminated structure of a reinforced concrete square storage container using the reinforced concrete square storage container according to claim 2, wherein the guide convex portion is an opening of the container main body. A laminated structure of square storage containers made of reinforced concrete, in which a plurality of stages are stacked so as to fit in the upper part, and the opening of the uppermost container body is covered with the lid.   The reinforced concrete square storage container according to claim 4, wherein the reinforced concrete rectangular storage container has at least one outer surface of the side wall in the container main body according to claim 3 having a concave-convex shape with a central portion recessed in a band shape. A stack structure of storage containers, wherein a plurality of the reinforced concrete square storage containers are arranged side by side in a state in which the corner outer surfaces of the side walls of the container body are in contact with each other, and the adjacent container bodies are fastened with a fastening band. It is made of reinforced concrete, which is made by connecting and fixing multiple layers of the same structure in the height direction and connecting and fixing the container bodies of each reinforced concrete square storage container placed in the height direction with a fastening band. Stacked structure of square storage containers.

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