Leakage suppression member, wiring device fixing device, and installation structure for wiring device fixing device

Abstract

The present invention provides a leakage suppression member, a wiring device fixing device, and an installation structure for the wiring device fixing device that are harmless to the human body. [Solution] In the leakage suppression member 30, each of the bottom wall portion 31 and the pair of side wall portions 33 is formed of a shielding material that does not contain lead and has radiation shielding performance.

Description

Technical Field

[0001] The present invention relates to a leakage suppression member, a wiring device fixing device, and an installation structure of the wiring device fixing device.

Background Art

[0002] Using a leakage suppression member that suppresses the leakage of radiation, suppression of the leakage of radiation from the inside to the outside of a room such as an X-ray room is attempted. For example, the radiation protection equipment box described in Patent Document 1 is composed of a box body and a lead plate that shields radiation. The lead plate is integrally pasted on the back surface of the box body and is also pasted on the back surface other than the connection surface of the wiring pipe in the box body. The lead plate is processed according to the size of the box body and has a groove shape.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in Patent Document 1, the lead plate for suppressing the leakage of radiation is not preferable because it is harmful to the human body.

Means for Solving the Problems

[0005] The leakage suppression member for solving the above problems is a leakage suppression member that is placed on the back side of a wall and suppresses the leakage of radiation passing through a through hole formed in the wall to the back side of the wall, comprising a bottom wall portion that faces a virtual surface including the back side of the wall and forms a facing portion that is separated in a direction perpendicular to the virtual surface, and a pair of side wall portions that are erected from the bottom wall portion toward the wall and are arranged facing each other while sandwiching the through hole, and the gist of the invention is that each of the bottom wall portion and the pair of side wall portions is formed of a shielding material that does not contain lead and has radiation shielding performance.

[0006] With respect to the leakage suppression member, the shielding body in the bottom wall portion and at least one of the pair of side wall portions is preferably formed by stacking multiple shielding plates that do not contain lead and have the radiation shielding performance.

[0007] The leakage suppression member may be provided with a maintenance member that is superimposed on the bottom wall and the pair of side walls, and is integrated with the bottom wall and the pair of side walls, thereby maintaining the relative position between the bottom wall and the pair of side walls.

[0008] Regarding the leakage suppression member, the maintenance member is preferably formed by bending a lead-free metal plate, and the maintenance member is preferably superimposed on and integrated with the outer surface in the thickness direction of the shielding body in the bottom wall portion and the outer surface in the thickness direction of the shielding body in the pair of side wall portions.

[0009] Regarding the leakage suppression member, the maintenance member further comprises an adhesive outer sheet, and the outer sheet is preferably attached to at least the portion of the surface of the bottom wall and the pair of side walls that exceeds the area covered by the metal plate.

[0010] Regarding the leakage suppression member, the shielding body of the bottom wall portion is formed by stacking multiple shielding plates with the direction perpendicular to the virtual surface as the thickness direction of the shielding plates, and each of the pair of side wall portions is formed by stacking multiple shielding plates with the direction of alignment of the pair of side wall portions as the thickness direction of the shielding plates, and it is preferable that the pair of side wall portions are arranged in overlapping positions on the surface of the bottom wall portion facing the virtual surface.

[0011] Regarding the leakage suppression member, a wiring device fixing body is provided between the pair of side wall portions, with a wiring device fixing portion on the front side for fixing a wiring device that is installed facing the through hole, and the wiring device fixing body is provided with a wiring device fixing portion on the front side for fixing a wiring device that is installed facing the through hole, and it is preferable that the wiring device fixing body is positioned so that its front side faces away from the bottom wall portion in a direction perpendicular to the virtual plane, and so that its front side does not protrude beyond the side wall portion to the side opposite the bottom wall portion.

[0012] Regarding the leakage suppression member, when viewing the bottom wall portion in a direction perpendicular to the virtual plane, the bottom wall portion is rectangular and has two sets of opposing sides, and a pair of side walls are provided along one of the sets of opposing sides of the bottom wall portion, and in the leakage suppression member, an inlet is defined on each side of the other set of opposing sides of the bottom wall portion, between the pair of side walls, allowing wiring material to be introduced.

[0013] A wiring device fixing device for solving the above problems is a wiring device fixing device arranged on the back side of a wall, comprising: a leakage suppression member according to any one of claims 1 to 5; and a wiring device fixing body that opens to the front, having a wiring device fixing portion on its front side for fixing a wiring device installed facing the through hole, wherein the wiring device fixing body opens with its front facing away from the bottom wall, and is arranged so that the front does not protrude beyond the side wall to the side opposite the bottom wall.

[0014] The installation structure for a wiring device fixing device to solve the above problems is an installation structure for a wiring device fixing device in which a frame structure fixed at both ends is erected on a pair of columns erected on the back side of a wall, and the frame structure comprises a leakage suppression member as described in any one of claims 1 to 5, and a wiring device fixing body that opens to the front, having a wiring device fixing part on the front side for fixing a wiring device installed facing the through hole, wherein the wiring device fixing body opens with its front facing away from the bottom wall, and is positioned so that the front does not protrude beyond the side wall to the opposite side of the bottom wall, and the wiring device fixing body and the leakage suppression member are fixed to the frame structure by screws that penetrate the bottom wall and the wiring device fixing body and are screwed into the frame structure. [Effects of the Invention]

[0015] This invention can be made harmless to the human body. [Brief explanation of the drawing]

[0016] [Figure 1] Figure 1 is a perspective view showing a wiring device fixing device and its installation structure. [Figure 2] Figure 2 is a cross-sectional view showing a wiring device fixing device and its installation structure. [Figure 3] Figure 3 is a perspective view showing the leak suppression member and the maintenance member. [Figure 4] Figure 4 is an exploded perspective view showing the leak suppression member. [Figure 5] Figure 5 is a perspective view showing the leak suppression member. [Figure 6] Figure 6 is a perspective view showing the maintenance components. [Figure 7] Figure 7 is a rear view showing the structure with the leak suppression member fixed to it. [Figure 8] Figure 8 is a front view showing a wiring device fixing device and its installation structure. [Figure 9] Figure 9 is a perspective view showing another example of a leak suppression member. [Figure 10]FIG. 10 is a perspective view showing a leakage suppression member provided with an exterior sheet.

Mode for Carrying Out the Invention

[0017] Hereinafter, an embodiment in which a leakage suppression member, a wiring device fixing device, and an installation structure of the wiring device fixing device are embodied will be described. <Wiring Device Fixing Device> As shown in FIGS. 1 and 2, the wiring device fixing device 20 is disposed on the back side of the wall 11. The wiring device fixing device 20 includes a wiring device fixing body 21 and a leakage suppression member 30.

[0018] <Wall> The wall 11 is composed of wall panels that constitute a radiation shielding wall of a building. The wall 11 is formed by laminating a plurality of gypsum boards 13. The gypsum board 13 is a gypsum board that does not contain lead and is mixed with barium. More specifically, the gypsum board 13 is a gypsum board reinforced with glass fibers and mixed with barium sulfate that does not contain lead.

[0019] The plate thickness of the gypsum board 13 is set in a plurality of types as standard values. Therefore, the wall 11 is formed by appropriately selecting the plate thickness of the gypsum board 13 and setting the number of laminated sheets in order to obtain a desired wall thickness. Here, the surface side of the wall 11 is referred to as the wall front side. The surface of the wall 11 is the surface exposed to the interior. Therefore, the wall front side is the interior side of the wall 11. Also, the back surface side of the wall 11 is referred to as the wall back side. The back surface of the wall 11 is the opposite surface of the front surface. Therefore, the wall back side is the side opposite to the interior side of the wall 11.

[0020] A through hole 15 is formed in the wall 11. The through hole 15 communicates the front and back surfaces of the wall 11. The through hole 15 is in the shape of a long hole extending longitudinally in the vertical direction. However, the shape of the through hole 15 is not limited to the above-described long hole shape and can be appropriately changed. The through hole 15 is used for installing a wiring device 17 described later on the wall 11. The wiring device 17 is installed on the wall 11 so as to face the through hole 15 and is fixed to a wiring device fixing body 21 described later.

[0021] The wall 11 is erected by being fixed to a plurality of erected columns 12. The wall 11 is erected on the interior side of the columns 12. In other words, the columns 12 are erected on the back side of the wall 11. A support structure 16 is installed on the back side of the wall. The support structure 16 is erected on a pair of adjacent columns 12. One end of the support structure 16 in the longitudinal direction is fixed to one of the adjacent columns 12, and the other end of the support structure 16 in the longitudinal direction is fixed to the other of the adjacent columns 12. Therefore, both ends of the support structure 16 are fixed to the pair of columns 12 erected on the back side of the wall 11.

[0022] <Wiring device mounting bracket> The wiring device holder 21 is located on the back side of the wall. The wiring device holder 21 comprises a rectangular box-shaped box body 22 and a pair of wiring device fixing parts 27 integrated with the box body 22. The wiring device holder 21 is made of synthetic resin. The shape of the box body 22, i.e., the wiring device holder 21, may be changed as appropriate, as long as the wiring device 17 can be installed in a position facing the through hole 15.

[0023] The box body 22 comprises a rectangular bottom plate 23, long side plates 24 erected from a pair of long side edges of the bottom plate 23, and short side plates 25 erected from a pair of short side edges of the bottom plate 23. The wiring device holder 21 has a front surface 21a on the side opposite to the bottom plate 23. The front surface 21a is formed by the end faces of the pair of long side plates 24 and the pair of short side plates 25, which are opposite to the bottom plate 23. The box body 22 defines a storage space 26 defined by the bottom plate 23, the pair of long side plates 24, and the pair of short side plates 25. The storage space 26 opens on the front surface 21a side of the wiring device holder 21, that is, on the side opposite to the bottom plate 23. Therefore, the wiring device holder 21 opens to the front surface 21a.

[0024] The base plate 23 has multiple fixing holes (not shown) for fixing the wiring device holder 21 to the frame 16 with screws 14. The fixing holes are located in the center of the base plate 23 in the longitudinal direction. The shape, number, and size of the fixing holes can be changed as appropriate, as long as the wiring device holder 21 can be fixed to the frame 16 with screws 14.

[0025] One of the pair of wiring device fixing parts 27 is provided on one of the pair of short side plates 25, and the other of the pair of wiring device fixing parts 27 is provided on the other of the pair of short side plates 25. The wiring device fixing parts 27 are integrated into the inner surface of each short side plate 25 and arranged in the housing space 26. Each wiring device fixing part 27 is a cylindrical part that contains a nut 27a. Each wiring device fixing part 27 is located on the front surface 21a side of the short side plate 25 and is open on the front surface 21a. Therefore, the wiring device fixing body 21 is provided with wiring device fixing parts 27 on the front surface 21a side for fixing wiring devices 17 which are installed facing the through hole 15. In detail, the wiring device fixing parts 27 are provided for fixing a retaining frame 18 that holds the wiring devices 17 to the wiring device fixing body 21.

[0026] The retaining frame 18 holds the wiring device 17 in its center. The retaining frame 18 is rectangular in shape, and through holes 18a are formed at both ends in the longitudinal direction of the retaining frame 18 for inserting fixing screws 19. By screwing the fixing screws 19 inserted through each through hole 18a into the nuts 27a of each wiring device fixing part 27, the wiring device 17 is fixed to the wiring device fixing body 21 via the retaining frame 18, and the wiring device 17 is positioned so that it faces the through hole 15.

[0027] Each short side plate 25 has a pair of wiring insertion openings 25a. Wiring material 17a, which will be connected to the wiring device 17, is inserted into each wiring insertion opening 25a from the outside of the box body 22. A protective tube 17b through which the wiring material 17a is inserted can also be connected to the wiring insertion opening 25a. Note that the wiring material 17a is not shown in Figure 8.

[0028] <Leakage suppression component> As shown in Figures 1 and 2, the leakage suppression member 30 is positioned on the back side of the wall 11 to suppress the leakage of radiation passing through the through-hole 15 formed in the wall 11 to the back side of the wall. The leakage suppression member 30 comprises a bottom wall portion 31 and a pair of side wall portions 33 that are erected from the bottom wall portion 31 toward the wall 11, sandwiching the through-hole 15 and facing each other. The direction in which the side wall portions 33 overlap the bottom wall portion 31, that is, the direction in which the side wall portions 33 are erected, is defined as the wall thickness direction X. The longitudinal direction of the bottom wall portion 31 and the side wall portions 33 is defined as the longitudinal direction Z of the leakage suppression member 30. Furthermore, the direction in which the pair of side wall portions 33 face each other is defined as the alignment direction Y.

[0029] The leakage suppression member 30 further comprises a maintenance member 40. The maintenance member 40 is superimposed on each of the bottom wall portion 31 and the pair of side wall portions 33, and is integrated with each of the bottom wall portion 31 and the pair of side wall portions 33. The maintenance member 40 maintains the relative position between the bottom wall portion 31 and the pair of side wall portions 33. The maintenance member 40 will be described in detail later.

[0030] <Bottom wall section> As shown in Figures 4 and 5, the bottom wall portion 31 is rectangular in shape when viewed in the wall thickness direction X. The bottom wall portion 31 is formed by a shielding body formed by laminating two shielding plates 32. More specifically, the bottom wall portion 31 is formed by bonding two shielding plates 32 together with an adhesive. The shielding plates 32 have radiation shielding performance without containing lead. More specifically, the shielding plates 32 are gypsum boards that do not contain lead and are mixed with barium, and more specifically, the shielding plates 32 are gypsum boards that are reinforced with glass fibers and mixed with lead-free barium sulfate.

[0031] In other words, the bottom wall portion 31 is made of the same material as the gypsum board 13 that forms the wall 11. The shielding plate 32 is formed by cutting the gypsum board 13 to the size of the bottom wall portion 31 in order to form the bottom wall portion 31 of the leakage suppression member 30. The thickness of the shielding plate 32 is determined according to the thickness of the selected gypsum board 13. Furthermore, the bottom wall portion 31 is formed by bonding the shielding plate 32 obtained by cutting the gypsum board 13 with adhesive. Therefore, the bottom wall portion 31, i.e., the shielding body, which is made by laminating two shielding plates 32, also has radiation shielding performance without containing lead. The thicknesses of the two laminated shielding plates 32 may be the same or different. The thickness direction of the bottom wall portion 31, i.e., the shielding body, coincides with the lamination direction of the shielding plates 32 in the bottom wall portion 31 and the wall thickness direction X of the bottom wall portion 31. Furthermore, the shielding body forming the bottom wall portion 31 is formed by stacking two shielding plates 32 with the thickness direction of the shielding plate 32 as the stacking direction.

[0032] The bottom wall portion 31 is rectangular in shape when viewed in the wall thickness direction X and has two sets of opposing sides. The bottom wall portion 31 also has an inner bottom wall surface 31a and an outer bottom wall surface 31b that are opposite to each other in the wall thickness direction X. Each of the inner bottom wall surface 31a and the outer bottom wall surface 31b is a flat surface. The inner bottom wall surface 31a is formed by the opposite side of the adhesive surface of one shielding plate 32 in the thickness direction, and the outer bottom wall surface 31b is formed by the opposite side of the adhesive surface of the other shielding plate 32 in the thickness direction.

[0033] The bottom wall portion 31 has a pair of bottom wall end faces 31c that are opposite to each other in the longitudinal direction Z. Each bottom wall end face 31c is a flat surface. The bottom wall portion 31 also has a pair of bottom wall side faces 31d that are opposite to each other in a direction perpendicular to the longitudinal direction Z and the wall thickness direction X, i.e., the alignment direction Y. Each bottom wall end face 31c and each bottom wall side face 31d is an elongated flat surface. Each of the bottom wall end faces 31c and bottom wall side faces 31d is often a cut surface formed when the gypsum board 13 is cut.

[0034] <Side wall section> Each of the pair of side wall sections 33 is rectangular in shape when viewed in the direction of alignment Y. The thickness direction of the side wall section 33 coincides with the direction of alignment Y. The size and shape of the pair of side wall sections 33 are the same. The side wall section 33 is formed by a shielding body formed by laminating two shielding plates 34. More specifically, the side wall section 33 is formed by bonding two shielding plates 34 together with an adhesive. The shielding plates 34 have radiation shielding performance without containing lead. More specifically, the shielding plates 34 are gypsum boards that do not contain lead and are mixed with barium, and more specifically, the shielding plates 34 are gypsum boards that are reinforced with glass fibers and mixed with lead-free barium sulfate.

[0035] The side wall portion 33 is made of the same material as the gypsum board 13 that forms the wall 11. The shielding plate 34 is formed by cutting the gypsum board 13 to the size of the side wall portion 33. The thickness of the shielding plate 34 is determined according to the thickness of the selected gypsum board 13. Furthermore, the side wall portion 33 is formed by bonding the shielding plate 34 obtained by cutting the gypsum board 13 with adhesive. Therefore, the side wall portion 33, which is made by laminating two shielding plates 34, also has radiation shielding performance without containing lead. The thicknesses of the two laminated shielding plates 34 may be the same or different. The thickness direction of the side wall portion 33, i.e., the shielding body, coincides with the lamination direction and alignment direction Y of the shielding plates 34 in the side wall portion 33. The side wall portion 33 is formed by laminating shielding plates 34 with the thickness direction of the shielding plates 34 as the lamination direction.

[0036] In the installation structure of the wiring device fixing device 20, the pair of side wall portions 33 are arranged facing each other, straddling the through hole 15. The direction in which the pair of side wall portions 33 are arranged straddling the through hole 15 is the alignment direction Y of the leakage suppression member 30. The alignment direction Y coincides with the stacking direction of the shielding plates 34 in each side wall portion 33. The longitudinal dimension of each side wall portion 33 coincides with the longitudinal dimension of the bottom wall portion 31. The side wall portion 33 has an inner side wall 33a and an outer side wall 33b that are opposite to each other in the alignment direction Y. Each of the inner side wall 33a and the outer side wall 33b is a flat surface. The inner side wall 33a is formed by the opposite side of the adhesive surface of one of the pair of shielding plates 34 that form the side wall portion 33, in the thickness direction. Furthermore, the outer surface 33b of the side wall is formed by a surface different from the adhesive surface of one of the two shielding plates 34 that form the side wall portion 33, in the thickness direction of the other shielding plate 34. In the pair of side wall portions 33, the inner surfaces 33a of each side wall face each other in the alignment direction Y, and the outer surfaces 33b of the pair of side walls are the outer surfaces in the alignment direction Y.

[0037] Each side wall portion 33 has a pair of side wall end faces 33c that are opposite to each other in the longitudinal direction Z. Each side wall end face 33c is a flat surface. In addition, each side wall portion 33 has side wall surfaces 33d that are opposite to each other in the wall thickness direction X of the leakage suppression member 30. Each side wall surface 33d is a flat surface.

[0038] The pair of side wall portions 33 are provided along each long side of one of the pairs of opposing sides of the bottom wall portion 31. In addition, in the leakage suppression member 30, an inlet 35 is defined on each short side of the other pair of opposing sides of the bottom wall portion 31, located between the pair of side wall portions 33. In other words, in the leakage suppression member 30, an inlet 35 is defined between the pair of side wall portions 33 through which the wiring material 17a can be introduced. One of the pair of side wall portions 33 is bonded with adhesive along one long side of the bottom wall portion 31, and the other of the pair of side wall portions 33 is bonded with adhesive along the other long side of the bottom wall portion 31. Each of the two shielding plates 34 of each side wall portion 33 is bonded to the inner surface 31a of the bottom wall at an end face that extends elongated in the longitudinal direction Z, forming the side wall surface 33d.

[0039] The pair of side wall portions 33 are arranged on top of each other on the inner surface 31a of the bottom wall portion 31. Furthermore, the pair of side wall portions 33 are formed by stacking multiple shielding plates 34, with the direction of alignment Y of the pair of side wall portions 33 being the thickness direction of the shielding plate 34 in the side wall portion 33.

[0040] In the leak suppression member 30, each bottom wall side surface 31d and each side wall outer surface 33b of each side wall portion 33 are located on the same plane. Furthermore, in the leak suppression member 30, each bottom wall end surface 31c of the bottom wall portion 31 and each side wall end surface 33c of the pair of side wall portions 33 are located on the same plane, and the leak suppression member 30 has an end surface 30a consisting of these bottom wall end surfaces 31c and the pair of side wall end surfaces 33c. When viewing the leak suppression member 30 in the longitudinal direction Z, each end surface 30a is U-shaped.

[0041] The distance between a pair of side wall portions 33 in the alignment direction Y is the shortest distance between the inner surfaces 33a of the side walls facing the alignment direction Y. The distance between a pair of side wall portions 33 is greater than the maximum dimension in the alignment direction Y on the front surface 21a of the wiring device holder 21. Therefore, the wiring device holder 21 can be positioned between a pair of side wall portions 33.

[0042] As shown in Figure 1, the distance between the pair of end faces 30a in the longitudinal direction Z is greater than the maximum dimension in the longitudinal direction Z on the front surface 21a of the wiring device holder 21. The installation surface 311 is defined as the area of ​​the inner surface 31a of the bottom wall, excluding the areas where the pair of side wall portions 33 are erected. The installation surface 311 is rectangular when viewed in the wall thickness direction X. The long side of the installation surface 311 is located where the inner surface 31a of the bottom wall and the inner surface 33a of the side wall intersect, and the short side of the installation surface 311 is located on the end face 31c of the bottom wall. The surface area of ​​the installation surface 311 is greater than the projected area of ​​the box body 22, specifically the area of ​​the rectangular shape enclosed by the outline on the front surface 21a. The installation surface 311 is slightly larger in the alignment direction Y than the maximum dimension in the alignment direction Y on the front surface 21a of the wiring device holder 21, and is larger in the longitudinal direction Z than the maximum dimension in the longitudinal direction Z on the front surface 21a of the wiring device holder 21. Therefore, when the wiring device holder 21 is positioned between a pair of side wall portions 33 and installed with the outer surface of the bottom plate 23 in contact with the installation surface 311, the outer surfaces of each short side plate 25 are positioned further towards the center in the longitudinal direction Z than both end faces 30a of the leakage suppression member 30. The dimension in the wall thickness direction X from the inner surface 31a of the bottom wall to the side surface 33d of the side wall is greater than the dimension from the outer surface of the bottom plate 23 of the wiring device holder 21 to the front surface 21a. Therefore, when the outer surface of the bottom plate 23 is in contact with the inner surface 31a of the bottom wall, i.e., the installation surface 311, the front surface 21a of the wiring device holder 21 is positioned further towards the bottom wall portion 31 than each side surface 33d. As a result, the entire wiring device holder 21 is positioned inside the leakage suppression member 30. Therefore, the wiring device holder 21 is positioned with its front surface 21a facing away from the bottom wall portion 31, and with the front surface 21a not protruding beyond the side wall portion 33 to the opposite side of the bottom wall portion 31.

[0043] In the wiring device fixing device 20 and its installation structure, the leakage suppression member 30 and the wiring device fixing body 21 are fixed to the frame 16 by screws 14. The screws 14 are inserted through fixing holes (not shown) formed in the bottom plate 23 of the wiring device fixing body 21, and are also screwed into the frame 16 by passing through the bottom wall portion 31 of the leakage suppression member 30 and the maintenance member 40 which will be described later.

[0044] <Maintenance components> As shown in Figures 3 and 6, the support member 40 is formed by bending a metal plate. The support member 40 is made of iron plate, which is a metal plate that does not contain lead. The support member 40 includes a bottom wall overlapping portion 41 that overlaps the bottom wall portion 31, a pair of side wall overlapping portions 43 that overlap each side wall portion 33, and a pair of end face overlapping portions 45 that overlap both the bottom wall portion 31 and the pair of side wall portions 33. The bottom wall overlapping portion 41, the pair of side wall overlapping portions 43, and the pair of end face overlapping portions 45 are integral.

[0045] As shown in Figures 6 and 7, the bottom wall overlapping portion 41 is cross-shaped when viewed in the thickness direction. The bottom wall overlapping portion 41 has a longitudinal side in the longitudinal direction Z and a transverse side in the alignment direction Y. The dimension of the bottom wall overlapping portion 41 in the longitudinal direction Z is slightly larger than the dimension of the bottom wall portion 31 in the longitudinal direction Z. The dimension of the bottom wall portion 31 in the longitudinal direction Z is the dimension between a pair of bottom wall end faces 31c. Also, the dimension of the bottom wall overlapping portion 41 in the alignment direction Y is slightly larger than the dimension of the bottom wall portion 31 in the alignment direction Y. The dimension of the bottom wall portion 31 in the alignment direction Y is the dimension between a pair of bottom wall side faces 31d.

[0046] The bottom wall overlapping portion 41 covers the bottom wall outer surface 31b of the bottom wall portion 31, overlapping it with the bottom wall outer surface 31b, except for the four corners of the bottom wall outer surface 31b. The bottom wall overlapping portion 41 overlaps the bottom wall portion 31 in the stacking direction of the shielding plates 32 in the bottom wall portion 31, that is, in the wall thickness direction X. Therefore, the pair of shielding plates 32 and the bottom wall overlapping portion 41 are stacked in the wall thickness direction X.

[0047] Multiple fixing holes 41a are formed in the bottom wall overlapping section 41 for fixing the maintenance member 40 to the frame 16 with screws 14. The fixing holes 41a are located in the center of the longitudinal direction of the bottom wall overlapping section 41. The shape, number, and size of the fixing holes 41a can be appropriately changed according to the fixing holes of the wiring device holder 21, as long as the maintenance member 40 can be fixed to the frame 16 together with the wiring device holder 21 using screws 14.

[0048] Each sidewall overlapping section 43 is located at both ends of the cross-shaped basewall overlapping section 41 in the alignment direction Y, extending in the thickness direction of the basewall overlapping section 41 from the longer edge extending in the longitudinal direction Z. Each sidewall overlapping section 43 is perpendicular to the basewall overlapping section 41. Each sidewall overlapping section 43 is rectangular in shape with its longitudinal side extending in the longitudinal direction Z. The dimension of the sidewall overlapping section 43 in the wall thickness direction X is slightly smaller than the dimension from the outer surface 31b of the basewall to the side surface 33d of the sidewall in the wall thickness direction X. Also, the dimension of the sidewall overlapping section 43 in the longitudinal direction Z is smaller than the dimension of the sidewall section 33 in the longitudinal direction Z.

[0049] Each side wall overlapping portion 43 covers the outer surface of the side wall 33b and the side surface of the bottom wall 31d on both outer surfaces in the alignment direction Y of the leakage suppression member 30, overlapping and covering almost the entire surface of the outer surface of the side wall 33b and the side surface of the bottom wall 31d. Only the ends of the outer surface of the side wall 33b in the longitudinal direction Z and the ends of the side surface of the bottom wall 31d in the longitudinal direction Z are exposed to the outside and not covered by the side wall overlapping portion 43.

[0050] Each end face overlapping portion 45 is located at both ends of the cross shape of the bottom wall overlapping portion 41 in the longitudinal direction Z, and extends in a U-shape in the thickness direction of the bottom wall overlapping portion 41 from the shorter edge extending in the alignment direction Y. Each end face overlapping portion 45 is perpendicular to the bottom wall overlapping portion 41.

[0051] Each end face overlapping portion 45 comprises a first overlapping portion 45a that overlaps the bottom wall end face 31c of the bottom wall portion 31, and a second overlapping portion 45b that overlaps each side wall end face 33c. The dimension of the first overlapping portion 45a in the alignment direction Y is slightly smaller than the dimension of the bottom wall end face 31c in the alignment direction Y. The dimension of the second overlapping portion 45b in the wall thickness direction X is smaller than the dimension of the side wall end face 33c in the wall thickness direction X.

[0052] The first overlapping portion 45a covers almost the entire bottom wall end face 31c, excluding both ends in the alignment direction Y. Each second overlapping portion 45b covers a portion of each side wall end face 33c near the bottom wall portion 31, overlapping with it. As a result, the leading edge of each side wall end face 33c in the wall thickness direction X is exposed to the outside and not covered by the second overlapping portion 45b.

[0053] The maintenance member 40 has its bottom wall overlapping portion 41 bonded to the bottom wall outer surface 31b by adhesive, and each side wall overlapping portion 43 bonded to the bottom wall side surface 31d and the side wall outer surface 33b by adhesive. Furthermore, each end face overlapping portion 45 of the maintenance member 40 is bonded to the end face 30a by adhesive. As a result, the maintenance member 40 is integrated with the leak suppression member 30. The maintenance member 40 is then superimposed on and integrated with the bottom wall outer surface 31b, which is the outer surface in the thickness direction of the shielding body of the bottom wall portion 31, and the side wall outer surfaces 33b, which are the outer surfaces in the thickness direction of the shielding body of the pair of side wall portions 33.

[0054] The maintenance member 40 is then fixed to the frame 16 by screws 14 that fix the wiring device fixing body 21 to the frame 16. The screws 14 are inserted through fixing holes formed in the bottom plate 23 of the wiring device fixing body 21, and are also screwed into the frame 16 by passing through the bottom wall portion 31 of the leakage suppression member 30 and the fixing hole 41a of the maintenance member 40.

[0055] The maintenance member 40 prevents the pair of side wall portions 33 from deforming in the direction of widening or narrowing the gap in the alignment direction Y. Furthermore, by adhering the maintenance member 40 to the leak suppression member 30, the maintenance member 40 maintains a state in which the bottom wall portion 31 and the pair of side wall portions 33 are integrated. In other words, the maintenance member 40 prevents the bottom wall portion 31 and each side wall portion 33 from separating.

[0056] The maintenance member 40 is made of lead-free iron plate and has radiation shielding properties. Therefore, the maintenance member 40, together with the bottom wall portion 31 and shielding plate 32 of the leakage suppression member 30, suppresses radiation leakage.

[0057] <Installation structure of wiring device fixing device> As shown in Figures 1 and 2, the installation structure for the wiring device fixing device 20 is provided on the back side of the wall 11. The wall 11 has through holes 15 that open to the front side of the wall, providing a space 26 for housing the wiring device fixing body 21.

[0058] In the installation structure of the wiring device fixing device 20, a frame 16, fixed at both ends, is erected on a pair of columns 12 that are erected on the back side of the wall 11. A leakage suppression member 30 is fixed to the frame 16 together with a maintenance member 40 using screws 14, and the wiring device fixing body 21 is also fixed using screws 14.

[0059] Between the pair of side wall portions 33 of the leakage suppression member 30, a wiring device fixing body 21 is positioned, opening to the front 21a, with a wiring device fixing portion 27 on the front 21a side for fixing a wiring device 17 that is installed facing the through hole 15. The wiring device fixing body 21 is fixed to the leakage suppression member 30 by screws 14 that fix the leakage suppression member 30 and the maintenance member 40 to the frame 16. The front 21a of the wiring device fixing body 21 is positioned further towards the bottom wall portion 31 than the side wall surface 33d. For this reason, the wiring device fixing body 21 opens with its front 21a facing away from the bottom wall portion 31, and is positioned so that the front 21a does not protrude beyond the side wall portion 33 on the side opposite to the bottom wall portion 31.

[0060] In the pair of side wall portions 33 of the leakage suppression member 30, the side wall surface 33d opposite to the bottom wall portion 31 is in contact with the back surface of the wall 11. In other words, the wall 11 is erected on the front side of the side wall portions 33 so as to be in contact with the pair of side wall surfaces 33d. Therefore, the wiring device fixing device 20 is located on the back side of the wall.

[0061] A retaining frame 18 holding the wiring device 17 is positioned on the front side of the wall. Fixing screws 19 inserted through each insertion hole 18a of the retaining frame 18 pass through through holes 15 and are screwed into nuts 27a of the wiring device fixing part 27 on the wiring device fixing body 21 on the back side of the wall. In this way, the wiring device 17 is fixed to the wiring device fixing body 21 via the retaining frame 18, and the wiring device 17 is installed on the front side of the wall.

[0062] Here, a virtual surface H is defined, including the back surface of the wall 11, as shown by the dashed line in Figure 2. Note that in Figure 2, the virtual surface H is shown separated from the back surface of the wall 11 in order to illustrate it. The through hole 15 opens into the virtual surface H on the back side of the wall. In the leakage suppression member 30, the bottom wall portion 31 constitutes a face portion that is separated from the wall 11 in a direction perpendicular to the virtual surface H, specifically in the wall thickness direction X. Furthermore, the bottom wall portion 31 is rectangular when viewed in a direction perpendicular to the virtual surface H, specifically in the wall thickness direction X.

[0063] The pair of side wall sections 33 are erected from the bottom wall section 31 toward the wall 11 and are arranged opposite each other, spaced apart, with the through hole 15 in between. The pair of side wall sections 33 sandwich the through hole 15 in the direction of alignment Y. The pair of side wall sections 33 are arranged in overlapping positions on the surface of the bottom wall section 31 that faces the virtual surface H. The inner surface 31a of the bottom wall and the installation surface 311 are parallel to the virtual surface H, but may be slightly offset and not parallel. Furthermore, each of the bottom wall section 31 and the pair of side wall sections 33 described above is formed of a shielding material that has radiation shielding performance without containing lead.

[0064] [Effect of the Embodiment] As shown in Figure 8, when the wall 11 is viewed from the front side, the through-hole 15 is surrounded by the box body 22 of the wiring device fixing body 21. The ends of the bottom wall portion 31 protrude in the longitudinal direction Z on both sides of the wiring device fixing body 21, including the box body 22. Furthermore, the side wall portion 33 is positioned outside the wiring device fixing body 21, including the box body 22, in the alignment direction Y. Therefore, the wiring device fixing body 21 is covered by the leakage suppression member 30 on both sides in the longitudinal direction Z and on both sides in the alignment direction Y. Thus, the leakage suppression member 30 is present on both sides of the through-hole 15 in the longitudinal direction Z and on both sides in the alignment direction Y. This suppresses the leakage of radiation from the inside of the room to the outside through the through-hole 15.

[0065] As shown in Figures 1 and 2, the bottom wall overlapping portion 41 of the maintenance member 40 covers almost the entire bottom wall outer surface 31b of the bottom wall portion 31, so the bottom wall overlapping portion 41, together with the bottom wall portion 31, suppresses radiation leakage in the wall thickness direction X. In addition, the side wall overlapping portion 43 of the maintenance member 40 covers almost the entire side wall outer surface 33b of the side wall portion 33, so the side wall overlapping portion 43, together with the side wall portion 33, suppresses radiation leakage in the alignment direction Y. Furthermore, the side wall overlapping portion 43 covers the boundary between the bottom wall inner surface 31a and the side wall surface 33d, which is the joint between the bottom wall portion 31 and the side wall portion 33, thus suppressing radiation leakage from the joint. In addition, the end face overlapping portion 45 covers the boundary between the bottom wall inner surface 31a and the side wall surface 33d, which is the joint between the bottom wall portion 31 and the side wall portion 33, thus suppressing radiation leakage from the joint.

[0066] [Effects of the Embodiment] According to the above embodiment, the following effects can be obtained. (1) The bottom wall portion 31 and the side wall portion 33 of the leak suppression member 30 are each formed of a lead-free shielding material. Therefore, the leak suppression member 30 is harmless to the human body.

[0067] (2) The bottom wall portion 31 of the leakage suppression member 30 is formed by laminating shielding plates 32 formed by cutting gypsum board 13. The side wall portion 33 is formed by laminating shielding plates 34 formed by cutting gypsum board 13. Therefore, the thickness of the bottom wall portion 31 and the side wall portion 33 of the leakage suppression member 30 can be easily adjusted. Thus, the leakage suppression member 30 can effectively suppress radiation leakage by adjusting the thickness of the bottom wall portion 31 and the side wall portion 33 according to its installation location.

[0068] (3) The leakage suppression member 30 can maintain the relative position of the bottom wall portion 31 and the pair of side wall portions 33 by the maintenance member 40. The maintenance member 40 can prevent the bottom wall portion 31 and the side wall portions 33 from separating during handling of the leakage suppression member 30. For example, compared to the case where the bottom wall portion 31 and the side wall portions 33 are handled and installed separately, handling of the leakage suppression member 30 becomes easier.

[0069] (4) The maintenance member 40 prevents the pair of side walls 33 from separating in the direction Y. This maintains the suppression of radiation leakage by the pair of side walls 33. Furthermore, the maintenance member 40 prevents the pair of side walls 33 from approaching each other in the direction Y. Therefore, the maintenance member 40 prevents the wiring device fixing body 21 from becoming difficult to accommodate between the pair of side walls 33.

[0070] (5) The maintenance member 40 is superimposed on and integrated with the bottom wall outer surface 31b, which is the outer surface in the thickness direction of the shielding body of the bottom wall portion 31, and the side wall outer surfaces 33b, which are the outer surfaces in the thickness direction of the shielding body of the pair of side wall portions 33. Therefore, in a leakage suppression member 30 consisting of a bottom wall portion 31 made by stacking a plurality of shielding plates 32 and a side wall portion 33 made by stacking a plurality of shielding plates 34, the separation of the shielding plates 32 and 34 can be suppressed. Thus, even if the leakage suppression member 30 is made by cutting gypsum board 13 to form shielding plates 32 and 34 and then bonding the shielding plates 32 and 34 together, the shape can be maintained by using the maintenance member 40.

[0071] (6) The radiation that passes through the through hole 15 attempts to pass through the bottom wall portion 31 in the wall thickness direction X, but the bottom wall overlap portion 41 of the maintenance member 40 is superimposed on the bottom wall portion 31 in the wall thickness direction X. Therefore, the bottom wall overlap portion 41 can improve the radiation shielding performance at the bottom wall portion 31. In addition, the radiation that passes through the through hole 15 attempts to pass through the side wall portion 33 in the alignment direction Y, but the side wall overlap portion 43 of the maintenance member 40 is superimposed on the side wall portion 33 in the alignment direction Y. Therefore, the side wall overlap portion 43 can improve the radiation shielding performance at the side wall portion 33.

[0072] (7) The maintenance member 40 is made of lead-free iron plate. The maintenance member 40 has higher radiation shielding performance than resin. Therefore, the maintenance member 40 can maintain the shape of the leakage suppression member 30 while also providing radiation shielding performance. Furthermore, since the bottom wall portion 31 and the side wall portion 33 of the leakage suppression member 30 are each formed using thin gypsum board 13, the leakage suppression member 30 equipped with the maintenance member 40 can fully perform its radiation shielding function even in the narrow space behind the wall.

[0073] (8) In the leakage suppression member 30, the bottom wall portion 31 is formed by stacking shielding plates 32 in the wall thickness direction X. Also in the leakage suppression member 30, the side wall portion 33 is formed by stacking shielding plates 34 in the alignment direction Y. The side wall portion 33 overlaps the inner surface 31a of the bottom wall portion 31, which is one surface in the wall thickness direction X. Therefore, the joint between the bottom wall portion 31 and the side wall portion 33 is parallel to the virtual plane H. For example, compared to the case where the joint between the bottom wall portion 31 and the side wall portion 33 is perpendicular to the virtual plane H, such as when the joint is between the bottom wall surface 31d and the inner surface 33a of the side wall, radiation leakage can be suppressed.

[0074] (9) The overlapping portion 43 of the side wall of the maintenance member 40 covers the joint between the bottom wall portion 31 and the side wall portion 33 from the outside in the alignment direction Y. Therefore, the overlapping portion 43 of the side wall can suppress radiation leakage from the joint between the bottom wall portion 31 and the side wall portion 33. For example, as in the case where the inner surface 33a of the side wall is bonded to the side surface 31d of the bottom wall to form the joint between the bottom wall portion 31 and the side wall portion 33, it is not necessary to increase the precision of the joint in order to suppress radiation leakage from the joint, thus making it easier to manufacture the leakage suppression member 30.

[0075] (10) Between the pair of side wall portions 33, a wiring device fixing body 21 equipped with a wiring device fixing portion 27 is positioned. The wiring device fixing body 21 is positioned such that, in the wall thickness direction X perpendicular to the virtual plane H, its front surface 21a faces away from the bottom wall portion 31, and the front surface 21a does not protrude beyond the side wall portion 33 to the side opposite the bottom wall portion 31. Therefore, since the wiring device fixing body 21 is positioned between the pair of side wall portions 33, even if radiation passes through the long side plate 24 of the box body 22, the leakage of radiation by the side wall portions 33 can be suppressed.

[0076] (11) When the wiring device holder 21 is positioned between the pair of side wall portions 33, both ends of the bottom wall portion 31 in the longitudinal direction Z extend outward in the longitudinal direction Z beyond the wiring device holder 21. Therefore, even if radiation passes through the short side plate 25 or the wiring insertion opening 25a of the box body 22, the extension of the bottom wall portion 31 can suppress the leakage of radiation.

[0077] (12) The leakage suppression member 30 is provided with an inlet 35 defined between a pair of side wall portions 33. Therefore, even if the wiring device fixing body 21 is placed between the pair of side wall portions 33, the wiring material 17a and protective tube 17b can be introduced toward the box body 22 through the inlet 35. Therefore, the wiring material 17a can be inserted into the wiring insertion port 25a or the protective tube 17b can be connected to the wiring device fixing body 21 placed between the pair of side wall portions 33.

[0078] (13) The wiring device fixing device 20 is fixed to the frame 16 which is erected on adjacent columns 12 by screws 14. For example, compared to fixing the frame 16 to a single column 12 in a cantilevered manner, the frame 16 can be fixed more firmly. As a result, even if the wiring device fixing device 20 fixed to the frame 16 is a heavy object equipped with a leakage suppression member 30 and a maintenance member 40, it can be placed on the back side of the wall without falling off.

[0079] [Example of changes] This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0080] ○The support structure 16 may be fixed to the column 12 in a cantilevered state, with only one end in the longitudinal direction fixed to the column 12. ○The wiring device fixing device 20 may be fixed directly to the column 12 instead of being fixed to the frame 16. The method of installation is arbitrary as long as the wiring device fixing device 20 can be installed on the back side of the wall.

[0081] ○The leak suppression member 30 does not necessarily have a defined inlet 35. For example, the leak suppression member 30 may include a bottom wall portion 31, a pair of side wall portions 33, and a shielding wall portion that covers the gap between the pair of side wall portions 33. In this case, the leak suppression member 30 is in the shape of a rectangular box, consisting of the pair of side wall portions 33 and the pair of shielding wall portions. The bottom wall portion 31, the pair of side wall portions 33, and the pair of shielding wall portions may be integrally molded in a rectangular box shape from synthetic resin to form the shielding body. The rectangular box-shaped shielding body is a block made of synthetic resin containing barium but not lead. More specifically, the rectangular box-shaped shielding body may be made of a rubber block molded from a rubber sheet mixed with barium sulfate.

[0082] ○The leak suppression member 30 may have only one inlet 35. In this case, the leak suppression member 30 comprises a bottom wall portion 31, a pair of side wall portions 33, and a shielding wall portion that covers only one of the gaps between the pair of side wall portions 33. As yet another example, a hole may be formed in the shielding wall portion that penetrates the shielding wall portion, and the through-hole may be used as the inlet 35.

[0083] ○The wiring device fixing body 21 may be positioned with its front surface 21a facing away from the bottom wall portion 31 in a direction perpendicular to the virtual plane H, i.e., in the wall thickness direction X, with the front surface 21a facing away from the bottom wall portion 31, and the front surface 21a protruding beyond the side wall surface 33d of the side wall portion 33 to the side opposite the bottom wall portion 31, but it is desirable that the front surface 21a be positioned on the same plane as the side wall surface 33d.

[0084] ○As shown in Figure 9, in the side wall portion 33 of the leakage suppression member 30, the stacking direction of the shielding plates 34 may be the wall thickness direction X. In this case, the bottom wall portion 31 is formed by stacking multiple shielding plates 32 with the wall thickness direction X perpendicular to the virtual plane H as the plate thickness direction of the shielding plates 32. Also, each of the pair of side wall portions 33 is formed by stacking multiple shielding plates 34 with the wall thickness direction X as the plate thickness direction of the shielding plates 34. The leakage suppression member 30 is arranged with the pair of side wall portions 33 stacked on top of each other on the inner surface 31a of the bottom wall portion 31. In this configuration, the shielding plates 32 of the bottom wall portion 31 and the shielding plates 34 of the side wall portions 33 are stacked in the wall thickness direction X. In addition, the inner surface 33a and outer surface 33b of each side wall portion 33 are formed by joining the end faces of the stacked multiple shielding plates 34. One side surface 33d of each side wall portion 33 is formed by one thickness surface of the laminated shielding plate 34 and is bonded to the inner surface 31a of the bottom wall with adhesive. The other side surface 33d of each side wall portion 33 is formed by the other thickness surface of the laminated shielding plate 34.

[0085] The maintenance member 40 is formed by bending a metal plate. The maintenance member 40 is superimposed and integrated with the inner surface 31a of the bottom wall, the side surface 33d of each side wall portion 33, the inner surface 33a and outer surface 33b of each side wall portion 33, the side surface 31d of the bottom wall portion 31, and the outer surface 31b of the bottom wall portion 31. In other words, the maintenance member 40 is superimposed and integrated with the inner surface 31a of the bottom wall portion 31, which is the outer surface in the thickness direction of the shielding body of the bottom wall portion 31, and the side surface 33d of the pair of side wall portions 33, which are the outer surfaces in the thickness direction of the shielding body of the pair of side wall portions 33. As a result, the maintenance member 40 maintains the relative position of the bottom wall portion 31 and the pair of side wall portions 33.

[0086] ○As shown in Figure 10, the maintenance member 40 may further include an adhesive outer sheet 50. The outer sheet 50 is made of aluminum tape. The outer sheet 50 has an adhesive surface on one side of the sheet. The outer sheet 50 covers the entire maintenance member 40 from the outer side and is attached to the portion of the bottom wall portion 31 and the pair of side wall portions 33 that is beyond the area covered by the iron plate. In other words, the outer sheet 50 may be attached not only to the portion of the bottom wall portion 31 and the pair of side wall portions 33 that is beyond the area covered by the maintenance member 40 as a metal plate, but also to the entire maintenance member 40 itself. Therefore, the outer sheet 50, together with the maintenance member 40, is a maintenance member that maintains the relative position of the bottom wall portion 31 and the pair of side wall portions 33 in the leak suppression member 30.

[0087] ○The outer sheet 50 may be attached only to the portion of the leak suppression member 30 that is not covered by the maintenance member 40. In other words, the outer sheet 50 may be attached only to the portion of the bottom wall portion 31 and the pair of side wall portions 33 that exceeds the portion covered by the maintenance member 40, which is a metal plate material, that is, to the portion of the surface of the leak suppression member 30 that is exposed from the portion covered by the maintenance member 40.

[0088] ○The material and shape of the maintenance member 40 can be changed as appropriate, as long as it can maintain the relative position between the bottom wall portion 31 and the pair of side wall portions 33. For example, the maintenance member may be made only of the exterior sheet 50, rather than being the steel plate maintenance member 40 described in the embodiment.

[0089] ○The maintenance member 40 was formed by bending a metal plate, but it may also be formed into a desired shape by welding together multiple metal plates or other metal plates. ○The maintenance member 40 may be made of a material that does not have radiation shielding properties. In short, as long as the maintenance member 40 can maintain the relative position of the bottom wall portion 31 and the pair of side wall portions 33, the material of the maintenance member 40 may be changed as appropriate.

[0090] ○The maintenance member 40 is bonded to the leak suppression member 30 with an adhesive and integrated with the leak suppression member 30. However, the method of integrating the leak suppression member 30 and the maintenance member 40 may be by using a stapler or screws, or by attaching them with double-sided adhesive tape.

[0091] ○The leakage suppression member 30 does not necessarily have to be equipped with a maintenance member 40. ○The bottom wall portion 31 does not have to be rectangular when viewed in a direction perpendicular to the virtual plane H. The bottom wall portion 31 can be arbitrarily changed to a hexagonal, pentagonal, or elliptical shape when viewed in a direction perpendicular to the virtual plane H. Furthermore, the pair of side wall portions 33 do not have to be provided along the edges of the bottom wall portion 31, as long as an inlet 35 is defined between the pair of side wall portions 33 and the wiring device fixing body 21 can be placed there.

[0092] ○The shielding plate 32 that forms the bottom wall portion 31 and the shielding plate 34 that forms the side wall portion 33 may be made from materials other than the gypsum board 13 that forms the wall 11, as long as they do not contain lead. ○The bottom wall portion 31 may be formed by a single shielding plate 32, or by three or more shielding plates 32. Also, the side wall portion 33 may be formed by a single shielding plate 34, or by three or more shielding plates 34.

[0093] ○The leakage suppression member 30 may be arranged such that a pair of side wall portions 33 sandwich the through hole 15 in the vertical direction. [Explanation of Symbols]

[0094] X...Wall thickness direction, Y...Alignment direction, H...Virtual plane, 11...Wall, 15...Through hole, 16...Support structure, 17...Wiring device, 17a...Wiring material, 20...Wiring device fixing device, 21...Wiring device fixing body, 21a...Front surface, 27...Wiring device fixing part, 30...Leakage suppression member, 31...Bottom wall section, 31a...Inner surface of bottom wall, 31d...Side surface of bottom wall, 32,34...Shielding plate, 33...Side wall section, 33b...Outer surface of side wall, 35...Inlet, 40...Maintenance member, 50...Exterior sheet.

Claims

1. A leakage suppression member, which is positioned on the back side of a wall and suppresses the leakage of radiation passing through a through-hole formed in the wall to the back side of the wall, A bottom wall portion that faces a virtual surface including the back surface of the wall and forms a facing portion that is separated in a direction perpendicular to the virtual surface, It comprises a pair of side wall portions that are erected from the bottom wall portion toward the wall and are arranged facing each other, sandwiching the through hole, A leakage suppression member characterized in that each of the bottom wall portion and the pair of side wall portions is formed of a shielding material that does not contain lead and has radiation shielding performance.

2. The leakage suppression member according to claim 1, wherein the shielding body in the bottom wall portion and at least one of the pair of side wall portions is formed by stacking a plurality of shielding plates that do not contain lead and have the radiation shielding performance.

3. The leakage suppression member according to claim 2, further comprising a maintenance member that is superimposed on the bottom wall portion and each of the pair of side wall portions, and is integrated with each of the bottom wall portion and each of the pair of side wall portions, and maintains the relative position between the bottom wall portion and the pair of side wall portions.

4. The aforementioned maintenance member is formed by bending the lead-free metal plate, The leakage suppression member according to claim 3, wherein the maintenance member is superimposed on and integrated with the outer surface in the thickness direction of the shielding body of the bottom wall portion and the outer surface in the thickness direction of the shielding body of the pair of side wall portions.

5. The leakage suppression member according to claim 4, wherein the maintenance member further comprises an adhesive outer sheet, the outer sheet being attached to at least the portion of the surface of the bottom wall and the pair of side walls that exceeds the area covered by the metal plate.

6. The shielding body of the bottom wall is formed by stacking multiple shielding plates with the direction perpendicular to the virtual plane being the thickness direction of the shielding plate. Each of the pair of side wall portions is formed by stacking multiple shielding plates with the direction in which the pair of side wall portions are aligned being the thickness direction of the shielding plate. The leakage suppression member according to any one of claims 2 to 5, wherein a pair of the side wall portions are arranged on top of each other on the surface of the bottom wall portion facing the virtual surface.

7. Between the pair of side wall portions, a wiring device fixing body is arranged with a wiring device fixing portion on the front side for fixing a wiring device that is installed facing the through hole, and the wiring device fixing body is opened to the front. The leakage suppression member according to claim 1 or 2, wherein the wiring device fixing body has an opening in a direction perpendicular to the virtual plane, with the front surface facing away from the bottom wall, and the front surface is arranged so as not to protrude beyond the side wall to the side opposite the bottom wall.

8. When viewing the bottom wall portion in a direction perpendicular to the virtual plane, the bottom wall portion is rectangular and has two sets of opposing sides. The pair of side walls are provided along one set of opposing sides of the bottom wall, The leakage suppression member according to claim 7, wherein an inlet for introducing wiring material is defined on each side of the other set of opposing sides of the bottom wall portion, between the pair of side wall portions.

9. A wiring device fixing device that is positioned on the back side of the wall, A leak suppression member according to any one of claims 1 to 5, The wiring device fixing body has an opening on the front side, and is provided with a wiring device fixing part on the front side for fixing a wiring device that is installed facing the through hole, The wiring device fixing device is characterized in that the front of the wiring device fixing body is open with the front facing away from the bottom wall, and the front is positioned so as not to protrude beyond the side wall to the side opposite the bottom wall.

10. A frame structure, with both ends fixed, is erected on a pair of columns that are set up on the back of the wall. A leak suppression member according to any one of claims 1 to 5, A wiring device fixing device installation structure comprising a wiring device fixing body opening to the front, with a wiring device fixing portion on the front side for fixing a wiring device installed facing the through hole, The wiring device holder is positioned such that its front surface faces away from the bottom wall, and that its front surface does not protrude beyond the side wall to the side opposite the bottom wall. An installation structure for a wiring device fixing device, wherein the wiring device fixing body and the leakage suppression member are fixed to the frame by screws that penetrate the bottom wall and the wiring device fixing body and are screwed into the frame.

Images