JP3167331U - Radiation shielding flooring - Google Patents

Abstract

Provided is a radiation shielding floor material that is resistant to impact, has high workability, and can consider safety for workers. A radiation shielding floor material (10) includes a shielding member (11) for shielding radiation, coating members (12, 13) laminated on at least one of the front surface and the back surface of the shielding member (11), a shielding member (11) and coating members (12, 13). And a fitting portion 14 capable of fitting with an adjacent floor material on at least one end face of the fitting member. Thereby, the radiation shielding floor member 10 can be laid flexibly according to the area and shape of the floor surface. [Selection] Figure 2

Description

  The present invention relates to a radiation shielding floor material that shields radiation from a radiation source, and more particularly to a radiation shielding floor material that shields radiation from a radiation source that may be present at the bottom of the floor by being installed on the floor surface. .

  Plants equipped with nuclear power plants and reactors, or experimental facilities that handle radiation, handle radiation sources necessary for business. These facilities properly manage radiation based on high security and rules. In addition, radiation management beyond what is stipulated in the regulations is also performed. In such a situation, facilities that handle these radiation often perform a process of shielding radiation from the radiation source even in a place that is generally regarded as safe.

  The shielding member that shields radiation often uses a dense material such as heavy metal or a compound thereof. A well-known shielding member uses lead or an alloy containing lead as a main component. Such a dense substance can shield the radiation by absorbing most of the energy of the passing radiation. Such a shielding member is used in a protective suit for facilities and workers that need to handle radiation as described above.

  On the other hand, facilities that handle radiation have characteristics that radiation sources are provided at various sites, and that workers work at various positions. For this reason, the shielding member needs to be attached according to the shape, structure, and characteristics of various parts. That is, the shielding member needs flexibility according to a target site (a site including a radiation source) to be attached.

  For example, facilities and plants including radiation sources often have a plurality of hierarchical structures. For this reason, facilities and plants have a basement, a first floor, a second floor, a third floor, and the like. For this reason, facilities and plants have a floor (or a ceiling when viewed from the opposite side). When considering a hierarchical structure, if there is a radiation source on the first floor below the second floor, the radiation from the first floor radiation source reaches the second floor, which is the ceiling on the first floor. Will do.

  At this time, a floor material is spread on the floor surface of the second floor, and radiation collides with the floor material. The flooring is made of resin, concrete, etc., but radiation may be transmitted, and there is a problem that the radiation from the first floor, which is the lower floor, reaches the second floor, or the floor surface is exhausted or drained There is a ventilation hole for carrying out the above, and a lattice-like lid called grating is covered on this ventilation hole. There is a possibility that radiation from the downstairs will reach through this grating.

  For this reason, when the shielding member which can shield a radiation is used as a flooring material, it can prevent that the radiation from the 1st floor which is a downstairs reaches a 2nd floor beyond a floor surface. Techniques have been proposed for shielding radiation from downstairs on such a floor (see, for example, Patent Documents 1, 2, and 3).

JP-A-11-133185 Japanese Utility Model Publication No. 1-146199 JP 2003-4893 A

  Patent Document 1 discloses a technique in which a stand made of a material in which metal and concrete are combined is placed on a device serving as a radiation source. The technique of Patent Document 1 can shield radiation from downstairs.

  However, the stand disclosed in Patent Document 1 is a very large device and can be installed when building a facility or plant such as a nuclear power plant. It is not suitable for subsequent introduction. What is concerned about already constructed facilities and plants is that the area where flooring is spread on the floor has a certain shielding effect against radiation, but the area where grating is installed is radiation. It is difficult to shield. Existing facilities and plants may have such a grating, and it is necessary to deal with the area of this grating. A large-scale apparatus such as Patent Document 1 has a problem that it is difficult to efficiently perform the work of blocking the grating existing in such an existing facility or plant.

  Moreover, since the apparatus disclosed in Patent Document 1 is exposed from concrete, there is a problem that the effect of shielding radiation is weakened because it is vulnerable to impacts from falling objects on the floor and is damaged.

  Patent Document 2 discloses a technique in which a plurality of lead mats are fixed to each other with metal fittings so that there is no gap.

  However, it is difficult for the apparatus disclosed in Patent Document 2 to be installed afterwards, as in Patent Document 1. In addition, it may be damaged by falling objects. Moreover, since it is a lead mat, if it spreads on a floor surface, it may affect workability | operativity of a business worker.

  Patent Document 3 discloses a shielding mat in which a plurality of thin shielding bodies are covered with a transparent material. When this shielding mat is spread on the floor, radiation from the downstairs can be shielded. Since the shielding mat disclosed in Patent Document 3 has a covering on the surface of the shielding body formed of metal or the like, there is little influence from falling objects. Even when laid on the floor, it is considered that there is little impact on the workability of business workers.

  However, the metal or alloy used as the shielding body is very heavy, and the shielding mat covered with a material such as resin becomes very heavy. In order to lay such a heavy shielding mat on the floor surface, particularly on the floor surface including the grating region, the burden on the operator increases. In particular, since the working time of the worker becomes long, the worker may be exposed during the work.

  As described above, the shielding floor materials in the prior art are (1) laying in existing facilities already constructed, (2) preventing damage and ensuring workability after laying, (3) efficiency in laying work and worker safety. It was not enough in terms of securing.

  An object of the present invention is to provide a radiation shielding flooring that is resistant to impact, has high workability, and can be considered for safety to workers.

  In order to solve the above problems, a radiation shielding flooring of the present invention includes a shielding body that shields radiation, a covering layer laminated on at least one of a front surface and a back surface of the shielding body, and at least one of the shielding body and the covering body. A mating portion capable of mating with an adjacent flooring material at one end face

  The radiation shielding flooring of the present invention can shield radiation from the downstairs by laying so as to block the grating or the like existing on the floor surface. As a result, for example, it is possible to easily cope with a subsequent radiation shielding work in a built facility or plant.

  In addition, since the radiation shielding flooring of the present invention has a covering such as a resin on the surface, it is resistant to impacts on falling objects and has less influence on daily operations of business workers.

  In addition, since the radiation shielding flooring is a unit that is easy to transport and work, the work efficiency in laying work is increased and the safety of the worker is ensured.

It is a mimetic diagram of the floor in an embodiment of the invention. It is a side view of the radiation shielding floor material in embodiment of this invention. It is a side view of the radiation shielding floor material in embodiment of this invention. It is a side view of the radiation shielding floor material in embodiment of this invention. It is a side view of the radiation shielding floor material in embodiment of this invention. It is a perspective view which shows the connection state of the radiation shielding flooring in embodiment of this invention. It is a schematic diagram of the floor surface in which the radiation shielding flooring material in embodiment of this invention was laid.

  The radiation shielding flooring according to the first aspect of the present invention includes a shielding body for shielding radiation, a covering layer laminated on at least one of a front surface and a back surface of the shielding body, and at least one end face of the shielding body and the covering body. And a fitting portion that can be fitted to the adjacent flooring.

  With this configuration, it is possible to lay a radiation shielding floor material on a floor surface where radiation needs to be shielded later in a built facility.

  In the radiation shielding flooring according to the second aspect of the present invention, in addition to the first aspect, the covering has flexibility against impact.

  With this configuration, the shield is protected from impact on the floor surface on which the radiation shielding flooring is laid.

  In the radiation shielding flooring according to the third aspect of the present invention, in addition to the first or second aspect, the covering includes at least one of a floor surface, a wall surface and a ceiling in a room where the radiation shielding flooring is laid. Has the same material.

  With this configuration, the workability, appearance, and comfort in the room where the radiation shielding flooring is laid are kept high.

  In the radiation shielding flooring according to the fourth aspect of the present invention, in addition to any one of the first to third aspects, the shielding body has a compressive strength of 20 MPa or more.

  With this configuration, in combination with the protection of the cover, breakage and deterioration of the shield are prevented.

  In the radiation shielding flooring according to the fifth aspect of the present invention, in addition to any of the first to fourth aspects, the shielding body is a composite of at least one of metal powder and metal compound powder and an organic substance. .

  With this configuration, the shielding body can realize a function of shielding radiation while having flexibility and compressive strength.

  In the radiation shielding flooring according to the sixth aspect of the present invention, in addition to the fifth aspect, at least one of the metal powder and the metal compound powder is tungsten powder, tungsten compound powder, lead powder, lead compound powder, iron powder. And at least one of iron compound powder.

With this configuration, the manufacturing cost of the shield can be suppressed.
In the radiation shielding flooring according to the seventh aspect of the present invention, in addition to the fifth aspect, the shielding body is a composite material of a metal powder and a metal compound powder having a density of 10 g / cm ³ or more and a resin. It is.

  With this configuration, the shielding body can realize a function of shielding radiation while having flexibility and compressive strength.

  In the radiation shielding flooring according to the eighth aspect of the present invention, in addition to the fifth aspect, the shielding body is a resin composition containing a thermoplastic resin and tungsten powder, and the thermoplastic resin is at least a heat The plastic polyurethane elastomer contains 10 to 90 parts by weight in the resin, and contains one or more of olefinic resin and plasticizer.

  In the radiation shielding flooring according to the ninth aspect of the present invention, in addition to the fifth aspect, the shield is made of an elastomer made of thermoplastic elastomer or vulcanized rubber, tungsten, W alloy, WC, Mo, A composite in which high-density particles made of Mo alloy are dispersed, and the elastomer or vulcanized rubber and the high-density particles in the entire volume of the composite are 35 to 50% by volume and 50 to 65% by volume, respectively. The high-density particles include 60 to 80% by volume of large particles of 10 to 100 μm, 10 to 20% by volume of medium particles of 3 to 6 μm, and 10 to 20% by volume of small particles of 1 to 2 μm.

  With these configurations, the shield can realize a function of shielding radiation while having flexibility and compressive strength.

  In the radiation shielding flooring according to the tenth aspect of the present invention, in addition to any one of the first to ninth aspects, the fitting portion is one of the coverings protruding in the lateral direction from the end face of the shielding body. Part.

  In the radiation shielding flooring according to the eleventh aspect of the present invention, in addition to any one of the first to ninth aspects, the fitting portion is a convex provided on the end surface of the shielding body in the vertical direction of the shielding body. A portion and a recess.

  With these configurations, the radiation shielding floors connected to each unit are securely connected.

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

  (Embodiment)

  Embodiments will be described.

(Overview)
FIG. 1 is a schematic diagram of a floor surface in an embodiment of the present invention. The floor surface 1 shows the state of the floor of a building such as a nuclear power plant, an experimental facility or a plant that handles radiation. The floor surface 1 is usually provided with a flooring 3. The flooring 3 is often made of a material such as resin or vinyl, and is laid on the floor 1 made of concrete or steel.

  On the other hand, the floor surface 1 may have an opening for ventilation and drainage, and a grating 2 having a lattice-like mesh is fitted in the opening. In facilities and plants that have already been constructed, such a grating 2 is often left as it is. In this grating 2, the downstairs and the upper floor are not opened and connected as they are, and a downstairs ceiling surface exists on the bottom surface of the grating 2. However, compared with the area where the flooring 3 is laid, the thickness of the member at the boundary between the lower floor and the upper floor is thin. In addition, the flooring 3 has a function of shielding radiation, whereas the grating 2 does not have this function. That is, the area of the grating 2 has a possibility of transmitting radiation from the downstairs as compared with the area where the flooring 3 is laid.

  For this reason, it is necessary to lay a radiation shielding floor material capable of shielding radiation on the floor surface 1 where such a grating 2 exists. At this time, on the floor surface 1, the radiation shielding floor material of the embodiment may be laid only in the area of the grating 2, but it does not cause inconvenience for the operator engaged in the business on the floor surface 1. Therefore, it is preferable that a radiation shielding floor material is laid including the area other than the grating 2.

  FIG. 2 is a side view of the radiation shielding flooring according to the embodiment of the present invention. FIG. 2 shows a state in which the radiation shielding flooring 10 is viewed from the side, and shows a state in which a certain radiation shielding flooring 10 and a radiation shielding flooring 10A adjacent thereto are connected. In FIG. 2, the radiation shielding flooring 10 and the radiation shielding flooring 10 </ b> A are both the radiation shielding flooring 10 in the embodiment, and the signs are changed in order to distinguish the adjacent separate bodies. The radiation shielding floor 10 and the radiation shielding floor 10A are structurally similar. However, it does not mean that the difference in shape, pattern, and color as required is not permitted.

  The radiation shielding flooring 10 includes a shielding body 11 having a function of shielding radiation, and covering bodies 12 and 13 laminated on at least one of the front surface and the back surface of the shielding body 11 (in FIG. 2, the surface of the shielding body 11 is covered). The body 12 is laminated and the covering body 13 is laminated on the back surface of the shielding body 11), and the flooring adjacent to at least one end face of the shielding body 11 and the covering bodies 12 and 13 (in FIG. 2, the radiation shielding floor). Material 10A) and the fitting part 14 which can be fitted.

  The radiation shielding flooring 10 </ b> A has the same configuration as the radiation shielding flooring 10. For this reason, the symbol “A” is the same element as the numeric symbol only.

  The shield 11 has a function of shielding the transmission of radiation by containing metal powder or metal compound powder. Specifically, the energy of the radiation that collides with the shield 11 is attenuated by a metal powder included in the shield 11. By this action, the shield 11 can shield radiation.

  On the other hand, since the shield 11 is a member containing metal powder or the like, it is hard, and if there is a fallen object on its surface, it will be damaged by the impact. Of course, since it becomes the metal floor surface 1, there exists a problem which makes workability | operativity and comfortability worse for an indoor worker.

  Since the covering bodies 12 and 13 are laminated | stacked on such a shield 11, the floor surface 1 in which the radiation shielding flooring 10 was laid shows the covering bodies 12 and 13 on the surface. Here, the coverings 12 and 13 are made of a material having flexibility against impact, and can prevent the floor material from being damaged by falling objects. Naturally, since the surface of the flooring material is covered with the flexible coverings 12 and 13, the workability and comfortability in the room are enhanced.

  In FIG. 2, both the covering body 12 and the covering body 13 are provided, but the covering bodies 12 and 13 may be provided only on the front surface or the back surface of the shielding body 11. FIG. 3 is a side view of the radiation shielding flooring according to the embodiment of the present invention, and shows a state in which the covering 12 is laminated only on the surface of the shielding 11.

  The shield 11 is a hard member containing metal powder or the like, but the covering 12 covers the surface (the surface that comes into contact with the worker or the fallen object), thereby preventing damage and workability deterioration due to the fallen object. Because it will be possible.

  As described above, the radiation shielding flooring 10 realizes radiation shielding, damage prevention, and workability improvement by stacking the shielding body 11 and the covering bodies 12 and 13 that can shield radiation.

    (Laying by connecting units)

  The radiation shielding flooring 10 has a size and weight so that a load is extremely small for an operator during transportation, work, and the like. That is, the radiation shielding flooring 10 is in a state of being divided into units having the size and weight of a cloth bag. For example, the radiation shielding flooring 10 is 10 cm to several tens of cm square (which may be square, rectangular or polygonal) and has a weight of about several hundreds g to several kg. Such a radiation shielding flooring 10 is easy to carry and install, and the work time required for the operator to lay on the floor surface 1 is very short. By shortening the working time, the safety of the laying worker is kept high.

  Thus, the radiation shielding flooring 10 combined with other radiation shielding flooring as a unit has a fitting portion 14 for fitting with the adjacent radiation shielding flooring.

  The fitting part 14 should just be implement | achieved by various structures and functions. For example, it is an end surface in contact with an adjacent floor material (which may be a radiation shielding floor material or a general floor material), and is at least one of the end surface of the shield 11 and the coverings 12 and 13. The fitting part 14 should just be provided in an end surface.

  2 and 3, a part of the end face of the covering 12 of the radiation shielding floor 10 protrudes, and a part of the end face of the covering 12A of the radiation shielding floor 10A adjacent thereto is recessed. By fitting the protrusion and the recess 15 together, the adjacent radiation shielding flooring 10 and the radiation shielding flooring 10A are fitted. That is, the protruding portion (or the recessed portion 15) becomes the fitting portion 14.

  By such a fitting portion 14, the radiation shielding flooring 10 having a predetermined size that is easy to carry and work is combined with other radiation shielding flooring materials one after another and laid on the entire floor surface 1. It becomes like this.

  The operator uses the fitting portion 14 to combine the plurality of radiation shielding floor materials 10 conveyed indoors with the floor surface 1. The combined radiation shielding flooring 10 spreads and the entire floor surface 1 is covered with the combination of the radiation shielding flooring 10. Of course, at this time, a normal floor material other than the radiation shielding floor material 10 may be laid in an area other than the grating 2. In this case, it is preferable that the normal flooring has a fitting part that can be fitted to the fitting part 14 of the radiation shielding flooring 10.

  As described above, by laying the radiation shielding flooring 10 on the floor surface 1, (1) the coverings 12 and 13 appear on the surface of the floor surface 1, and the durability of the impact of the falling object is generated. 2) The coverings 12 and 13 appear on the surface, so that workability, comfortability and appearance are improved. (3) The shielding body 11 laminated on the coverings 12 and 13 shields radiation from the downstairs (especially The effect is remarkable in the portion of the grating 2 where radiation leakage is a concern. Furthermore, as described above, since the radiation shielding flooring 10 is a unit that is easy to transport and work, the working time is shortened and the safety of the worker is ensured.

  Moreover, in FIG. 2, FIG. 3, etc., although the fitting part 14 connects the radiation shielding flooring 10 adjacent in a perpendicular direction, you may connect the radiation shielding flooring 10 adjacent in a plane direction. That is, in the vertical cross section, the adjacent radiation shielding flooring 10 has the same shape, and it is also preferable that the fitting portion 14 is fitted with a combination of convex and concave in the plane direction.

  Next, the detail of each part is demonstrated.

(Shield)
The shield 11 has the ability and function to shield radiation. The shield 11 has a sheet shape or a plate shape, and produces a central shape of the radiation shielding floor material 10 laid on the floor surface 1. What is necessary is just to make it the sheet-like or plate-shaped shielding body 11 with a molding machine.

  The shield 11 is used for a radiation shielding floor material 10 laid on the floor surface 1. For this reason, it is necessary to receive the weight of indoor equipment and workers. For this reason, unlike the radiation shielding wall material in a prior art, the shielding body 11 needs to be provided with the compressive strength more than predetermined.

  For example, the shield 11 preferably has a compressive strength of 20 MPa or more. This compressive strength is measured according to JIS K7181 (1994), JIS K7208 (1975), etc., but in metals, it indicates “yield stress”.

  The shield 11 is preferably a composite of at least one of metal powder and metal compound powder and an organic substance. Since the shield 11 is used for the radiation shielding floor 10 laid on the floor surface 1, it is preferable that the shield 11 has a compressive strength as described above. A certain degree of flexibility is also required to produce compressive strength. For this reason, the shielding body 11 contains not only a metal powder and a metal compound powder but also an organic substance. By containing this organic substance, compressive strength and flexibility arise.

For example, the shield 11 may be a plate or sheet having flexibility by dispersing at least one of a metal powder and a metal compound powder in a resin, plastic, or rubber that is a flexible organic substance. The shield 11 is also preferably a composite material of a metal powder and metal compound powder having a density of 10 g / cm ³ or more and a resin. By having this composition, the shield 11 comes to have a compressive strength of 20 MPa or more.

  In addition, at least one of the metal powder and the metal compound powder includes at least one of tungsten powder, tungsten compound powder, lead powder, lead compound powder, iron powder, and iron compound powder. This is because it is easy to obtain and is excellent in terms of cost and other aspects. For example, tungsten is one of rare metals and has a high cost, but has a high density and an excellent radiation shielding effect, and has no merit.

  As the organic material, a resin, plastic, rubber, or the like having high flexibility may be used. When such an organic substance forms a composite with at least one of metal powder and metal compound powder, the shield 3 not only has a function of shielding radiation, but also generates flexibility such as bending. Because you can.

  The shield 11 is a resin composition containing a thermoplastic resin and tungsten powder, and the thermoplastic resin contains at least 10 to 90 parts by weight of a thermoplastic polyurethane elastomer in the resin, and includes an olefin resin and a plastic. It is also suitable to contain one or more agents. When the shield 11 has such a composition, the function of reliably shielding radiation can be exhibited while having sufficient compressive strength.

  Alternatively, another example of the material of the shield 11 is an elastomer made of a thermoplastic elastomer or a composite in which high-density particles made of tungsten, W alloy, WC, Mo, Mo alloy are dispersed in vulcanized rubber. . The elastomer or vulcanized rubber and high-density particles in the total volume of the composite are 35 to 50% by volume and 50 to 65% by volume, respectively. Further, the high-density particles include 60 to 80% by volume of large particles of 10 to 100 μm, 10 to 20% by volume of medium particles of 3 to 6 μm, and 10 to 20% by volume of small particles of 1 to 2 μm. It is. By using such a composite, the shield 11 can reliably shield radiation.

(Coating)
Next, the coverings 12 and 13 will be described.

  The covering bodies 12 and 13 are laminated on at least one of the front surface and the back surface of the shielding body 11. In FIG. 2, the covering bodies 12 and 13 are laminated | stacked on each of the surface and the back surface, and in FIG. 3, the covering body 12 is laminated | stacked only on the surface. Since one of the roles of the coverings 12 and 13 is to protect the shield 11, this role is realized to some extent by laminating the covering 12 only on the surface.

  The coverings 12 and 13 preferably have a plate shape or a sheet shape like the shielding body 11. Of course, a thin film may be used, but in order to cope with an impact caused by pressure from a device to be installed or an operator, it is preferable to have a certain thickness or more.

  Moreover, the covering bodies 12 and 13 should just have the same shape and magnitude | size as the shielding body 11. FIG. This is because the radiation shielding flooring 10 is formed by being laminated on the shield 11. In addition, depending on the formation state of the fitting part 14, a difference may arise in the shape and magnitude | size of the coverings 12 and 13 and the shielding body 11. FIG.

  The coverings 12 and 13 are preferably formed of a material having flexibility against impact. For example, resin, vinyl, rubber, chemical fiber, natural fiber, polyethylene, polypropylene, and the like may be formed of a harmless, inexpensive, easy to process, and strong material. This is because such a material provides a comfortable floor surface for indoor workers, and damage to the shield 11 due to an impact caused by a fallen object or an installation object is reduced. When the shield 11 is damaged, the radiation shielding effect of the shield 11 is reduced. For this reason, damage to the shield 11 is prevented by the coverings 12 and 13, so that the radiation shielding effect is easily maintained for a long time.

  Moreover, it is also suitable for the coverings 12 and 13 to have a material equivalent to at least one of the floor surface 1, the wall surface, and the ceiling in the room where the radiation shielding flooring 10 is laid. Equivalent materials include materials, colors, reflectivity, patterns, etc. This is because the coverings 12 and 13 have a material equivalent to at least one of the floor surface, the wall surface, and the ceiling, so that the indoor appearance and comfort are enhanced.

  For this reason, the material, color, reflectance, pattern, and the like of the coverings 12 and 13 may be determined after the radiation shielding flooring 10 is grasped on the site situation.

  The covering bodies 12 and 13 may be bonded to the shielding body 11 or may be welded. Generally, the coverings 12 and 13 are bonded to the shield 11 by an adhesive. The radiation shielding flooring 10 in the embodiment may be distributed in a state where the coverings 12 and 13 are laminated on the shielding body 11.

  Moreover, it is also preferable that the coverings 12 and 13 have an identification that can distinguish the front surface and the back surface. This is because the operator's work becomes easier. For example, the front surface is provided with characters such as “front”, marks, concaves, convexes, etc., so that the operator can easily distinguish the front surface and the back surface of the radiation shielding flooring 10 so that the work time is shortened. The safety in this is further enhanced. Alternatively, it is also preferable that the laying operator can easily know the direction (fitting direction) when laying on the floor surface by the color, pattern, mark, shape, etc. of the coverings 12 and 13. is there.

  One of the covering body 12 and the covering body 13 becomes the surface of the floor surface. That is, it becomes the surface of the feet of residents and workers. For this reason, it is also preferable that at least one of the covering body 12 and the covering body 13 has a non-slip on the surface thereof for the convenience of residents and workers. Anti-slip may be realized by surface roughness processing (irregularities are formed on the surface or fine slits are formed) or surface treatment (chemical treatment or physical treatment).

(Fitting portion)
Next, the fitting part 14 will be described. FIG. 4 is a side view of the radiation shielding flooring in the embodiment of the present invention.

  FIG. 4 is a drawing similar to FIG. 2, but a state in which a protrusion 16 is provided on the end surface of the covering 12 and a recess 15 that fits the protrusion 16 is provided on the end surface of the covering 12. Is shown. The fitting portion 14 is constituted by the protruding portion 16 (or the protruding portion 16 and the recessed portion 15 together). In addition, since the fitting part 14 should just be a member which implement | achieves the fitting with the adjacent radiation shielding flooring 10, it grasps | ascertains any of the protrusion part 16, the recessed part 15, or both as the fitting part 14. Is not a problem.

  Since the radiation shielding flooring 10 is laid on the floor surface 1 by being combined with the adjacent radiation shielding flooring, the one radiation shielding flooring 10 includes a protrusion 16 and a recess 15. One radiation shielding flooring 10 has its protrusion 16 fitted with a recess of an adjacent radiation shielding flooring, and its recess 15 fitted with a protrusion of an adjacent radiation shielding flooring.

  Thus, the fitting part 14 connects the adjacent radiation shielding floor materials 10 to each other.

  Moreover, the fitting part 14 may be comprised by the convex part and recessed part which were provided in the orthogonal | vertical direction of the shielding body 11 in the end surface of the shielding body 11, as FIG. 5 shows.

  FIG. 5 is a side view of the radiation shielding flooring in the embodiment of the present invention. The shield 11 includes a convex portion 20 along the vertical direction and a concave portion 21 fitted to the adjacent convex portion 20A on the end surface thereof. Similarly, the shielding body 11A of the radiation shielding floor material 10A adjacent to (connected to) the radiation shielding floor material 10 includes a convex portion 20A and a concave portion 21A. At this time, the shape of each of the covering bodies 12 and 13 is determined according to the convex portion 20 and the concave portion 21.

  The radiation shielding flooring 10 in FIG. 5 includes the convex portion 20 and the concave portion 21 as the fitting portion 14. The protrusions 20 and the recesses 21 </ b> A (the protrusions 20 </ b> A and the recesses 21) are engaged with each other to cause a catch in the vertical direction. As a result, even when the radiation shielding flooring 10 receives a pressure that separates it in the plane direction (laying direction), the connection between the radiation shielding flooring materials 10 is not released by the strong fitting.

  Moreover, as shown in FIG. 6, the radiation shielding flooring materials 10 may be connected in the plane direction. FIG. 6 is a perspective view showing a connected state of the radiation shielding flooring according to the embodiment of the present invention. The radiation shielding flooring 10 shown in FIG. 6 includes a fitting portion 14 composed of a convex portion and a concave portion in the plane direction, not in the vertical direction. By this fitting part 14, the radiation shielding flooring 10 can be connected to the adjacent radiation shielding flooring 10 one after another in the plane direction. By connecting in the planar direction in this way, the work is easy and the problems after laying are reduced.

  As described above, the fitting portion 14 has various shapes and structures, thereby strengthening the connection between the adjacent radiation shielding floor materials 10. Since the fitting at the fitting portion 14 is strong, there is no need to redo during the laying operation, and the operator's safety is easily ensured.

(Laying state)
As described above, when the radiation shielding flooring 10 described above is laid on the floor surface 1, it is covered with a member capable of shielding radiation, including the grating 2 portion, as shown in FIG. 7. As a result, radiation from the downstairs is shielded, and safety for workers in the room is ensured. FIG. 7 is a schematic diagram of a floor surface on which a radiation shielding floor material is laid in the embodiment of the present invention. As shown in FIG. 7, the floor surface 1 (including the grating 2) is covered by the radiation shielding function by laying the radiation shielding flooring 10.

  Particularly, since the radiation shielding flooring 10 in the embodiment of the present invention is laid as a unit according to the area, shape, etc. of the floor surface 1, it is necessary to shield radiation in a built facility or the like. The radiation shielding flooring 10 is laid on the floor surface 1 (which may be a part of the floor surface 1) on which the above occurs by an efficient and simple operation. As a result, safety from radiation in the room is increased.

  As described above, the radiation shielding floor material described in the embodiment is an example for explaining the gist of the present invention, and includes modifications and alterations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Floor surface 2 Grating 3 Flooring material 10 Radiation shielding flooring material 11 Shielding body 12, 13 Covering body 14 Fitting part 15 Concave part 16 Protruding part 20 Convex part 21 Concave part

Claims (11)

A shield that shields radiation;
A covering laminated on at least one of the front surface and the back surface of the shield;
A radiation shielding flooring comprising: a fitting part that can be fitted to an adjacent flooring on at least one end face of the shielding and the covering.   The radiation shielding flooring according to claim 1, wherein the covering has flexibility against impact.   The radiation shielding flooring according to claim 1, wherein the covering has a material equivalent to at least one of an indoor floor surface, a wall surface, and a ceiling on which the radiation shielding flooring is laid.   The radiation shielding flooring according to any one of claims 1 to 3, wherein the shield has a compressive strength of 20 MPa or more.   The radiation shielding flooring according to any one of claims 1 to 4, wherein the shield is a composite of at least one of a metal powder and a metal compound powder and an organic substance.   The radiation shielding flooring according to claim 5, wherein at least one of the metal powder and the metal compound powder includes at least one of tungsten powder, tungsten compound powder, lead powder, lead compound powder, iron powder and iron compound powder. The radiation shielding flooring according to claim 5, wherein the shielding body is a composite material of a metal powder and a metal compound powder having a density of 10 g / cm ³ or more and a resin.   The shield is a resin composition containing a thermoplastic resin and tungsten powder, and the thermoplastic resin contains at least 10 to 90 parts by weight of a thermoplastic polyurethane elastomer in the resin, an olefin resin and a plasticizer The radiation shielding flooring according to claim 5, comprising one or more of the following. The shield is an elastomer made of thermoplastic elastomer or a composite in which high-density particles made of tungsten, W alloy, WC, Mo, Mo alloy are dispersed in vulcanized rubber,
The elastomer or vulcanized rubber and the high-density particles in the entire volume of the composite are 35 to 50% by volume and 50 to 65% by volume, respectively.
The high-density particles include 60 to 80% by volume of large particles of 10 to 100 μm, 10 to 20% by volume of medium particles of 3 to 6 μm, and 10 to 20% by volume of small particles of 1 to 2 μm. The radiation shielding flooring according to claim 5.   The radiation shielding flooring according to any one of claims 1 to 9, wherein the fitting portion includes a part of the covering body that protrudes in a side surface direction from an end surface of the shielding body.   The radiation shielding flooring according to any one of claims 1 to 9, wherein the fitting portion has a convex portion and a concave portion provided in a vertical direction of the shielding body on an end surface of the shielding body.