JP7586792B2 - Shielding unit - Google Patents

Description

The present invention relates to a shielding unit.

A shielding material unit that blocks radiation is used to prevent radiation from leaking from inside a room, such as an X-ray room, to the outside. For example, the shielding material unit described in Patent Document 1 is attached to a wiring box placed inside a wall. A pipe is connected to a through hole formed in this wiring box. Wiring runs inside the pipe. The shielding material unit is attached to the connection point between the wiring box and the pipe. This prevents radiation that has entered the wiring box from the opening and enters the wiring box from leaking out of the wiring box.

JP 2006-50860 A

The walls, ceiling, and floor of a room such as an X-ray room are composed of a shielding partition that blocks radiation. When installing outlets, switches, etc. on the wall surface of a shielding partition wall that serves as a shielding partition wall, wiring may be drawn into the room through a through hole located in the shielding partition wall. Even in this case, it is preferable to attach a shielding material unit to the shielding partition wall in order to suppress leakage of radiation through the through hole in the shielding partition wall. The shielding material unit in this case may have, for example, a cylinder that surrounds the wiring and a plate on which the cylinder is erected. The shielding material unit is used by attaching the plate to the wall surface of the shielding partition wall.

If the shielding unit is to be attached to the shielding partition wall after the wiring has been pulled into the room, it will be necessary to insert the tip of the wiring into the cylinder inside the room. If the length of the wiring extending from the through hole in the shielding partition wall to the inside of the room is long, it will be time-consuming for the worker to insert the wiring into the cylinder. Therefore, when using the above shielding unit, it is easier for the worker to attach the shielding unit to the shielding partition wall before pulling in the wiring. It was desired to improve the freedom of timing for attaching the shielding unit to the shielding partition by making it easier to attach the shielding unit to the shielding partition wall after pulling in the wiring.

The shielding material unit that solves the above problem is a shielding material unit that is attached to a shielding partition that shields radiation and has a through hole through which wiring is drawn out, in order to prevent leakage of radiation from the through hole, and the shielding material unit is composed of multiple units that can be connected to each other, the units include a plate-shaped first member that is made of a shielding material that shields radiation and faces the shielding partition, and a second member that is made of a shielding material that shields radiation and is connected to the first member, the second member includes an erected portion that erects from the first member in an erecting direction away from the shielding partition, and the erected portion forms a cylinder that surrounds the wiring together with the erected portion of the second member of the other units when the multiple units are connected to each other.

In the shielding material unit, the second member may be entirely erected in the erecting direction from the first member.
In the shielding material unit, the first member has a first surface facing the shielding partition and a second surface positioned opposite the first surface in a perpendicular direction perpendicular to the first surface, and an end surface of the second member positioned on the first member side may be in contact with the second surface.

In the shielding material unit, the first member may have a first surface facing the shielding partition, and may have an overlapping piece that overlaps the first member of another unit in a direction perpendicular to the first surface when the units are connected to each other.

In a shielding material unit, when the multiple units are connected to each other, the portion where the overlapping piece of the first member of the other unit overlaps is called the overlapped portion, and the first member of the multiple units may have the overlapped piece and the overlapped portion.

In the shielding material unit, the second member may have an overlapping portion where the unit bodies overlap each other while the multiple unit bodies are connected to each other.
In the shielding material unit, the overlapping portion may be flat and extending from both ends of the upright portion in the circumferential direction of the cylindrical body toward the outside of the cylindrical body when the multiple units are connected to each other.

In the shielding unit, the first member has a first surface facing the shielding partition and a second surface located opposite the first surface in a direction perpendicular to the first surface, and the shielding unit includes a connecting member connecting the first member and the second member, the connecting member having an opposing portion facing the second surface and a connecting piece extending from the opposing portion and protruding from an end of the second member in the erecting direction, and the connecting piece may be bent by plastic deformation to connect to at least one of the connecting member and the second member in another unit body.

In the shielding material unit, the multiple units may have the same shape.

This invention allows for greater freedom in the timing of attaching the shielding unit to the shielding partition.

A cross-sectional view showing a shielding unit attached to a shielding partition wall. 1 is a perspective view showing a shielding partition wall and a shielding material unit. FIG. FIG. 2 is a cross-sectional view showing a shielding material unit. FIG. FIG. FIG. 2 is a perspective view showing a shielding partition wall and a unit body. FIG. 11 is a perspective view for explaining how the connecting piece is bent. FIG. 11 is a schematic diagram showing a second member in a modified example. FIG. 11 is a schematic diagram showing a second member in a modified example.

Hereinafter, one embodiment of the shielding unit will be described with reference to FIGS. 1 to 7. FIG.
[Installation location of shielding unit]
As shown in Fig. 1, the shielding material unit 10 is attached to a shielding partition wall 11, which serves as a shielding partition body that shields against radiation. Wiring 13 penetrates the shielding partition wall 11. The shielding partition wall 11 is a wall that shields against radiation. The shielding partition wall 11 is used, for example, as a wall of a room such as an X-ray room. Note that, for convenience of illustration, Figs. 2 and 6 show the shielding partition wall 11 positioned below the shielding material unit 10 in the drawings.

As shown in FIG. 1, the shielding partition wall 11 has a through hole 11h through which the wiring 13 is pulled out. The wiring 13 extends between the outside of the shielding partition wall 11 and the inside of the room through the through hole 11h. The shielding material unit 10 is attached to prevent radiation from leaking from the through hole 11h.

[Structure of shielding unit]
2 and 3, the shielding material unit 10 is composed of a plurality of unit bodies 20 that can be connected to each other. The shielding material unit 10 of the present embodiment is composed of two unit bodies 20. Hereinafter, all the unit bodies 20 constituting the shielding material unit 10 are also referred to as a plurality of unit bodies 20.

Each of the multiple unit bodies 20 includes a first member 21 and a second member 22. The first member 21 and the second member 22 are made of a shielding material that blocks radiation. The first member 21 is in the form of a plate that faces the shielding partition wall 11. In this embodiment, the first member 21 and the second member 22 are made of the same shielding material. Lead is used as the shielding material in this embodiment.

The shielding material unit 10 of this embodiment includes a connecting member 23. The connecting member 23 is made of metal. The connecting member 23 of this embodiment is made of hot-dip galvanized steel plate. In this embodiment, each of the multiple unit bodies 20 includes a connecting member 23. The connecting member 23 connects the first member 21 and the second member 22. As a result, the second member 22 is connected to the first member 21.

The multiple unit bodies 20 have the same shape as one another. Therefore, the multiple unit bodies 20 have the first members 21, the second members 22, and the connecting members 23 that are the same shape as one another.
[Structure of first member]
Next, the structure of the first member 21 in a state before the multiple units 20 are connected to each other will be described.

As shown in Figs. 4 and 5, the first member 21 has a flat body portion 25. The body portion 25 has a generally rectangular shape in a plan view. The body portion 25 has a first recess 26 in which a portion of the edge is recessed. The first recess 26 is located in the middle of the long edge of the body portion 25. The first recess 26 has a semicircular arc shape.

The first member 21 has a first surface 21a facing the shielding partition wall 11. The orthogonal direction perpendicular to the first surface 21a is referred to below as the orthogonal direction X. The first member 21 has a second surface 21b located opposite the first surface 21a in the orthogonal direction X. Note that a plan view of the main body portion 25 is a view of the main body portion 25 in the orthogonal direction X. The direction in which the long edge portion of the main body portion 25 extends is also referred to below as the first direction Y. The direction in which the short edge portion of the main body portion 25 extends is also referred to below as the second direction Z. The orthogonal direction X, the first direction Y, and the second direction Z are perpendicular to each other.

The first member 21 has a flat overlapping piece 27. The overlapping piece 27 has a rectangular shape when viewed from the orthogonal direction X. The overlapping piece 27 extends from a long edge of the main body 25 in the second direction Z at one end of the main body 25 in the first direction Y.

The main body 25 has a slit 29 at the boundary with the overlapping piece 27. The slit 29 is located on an extension of the edge of the overlapping piece 27. The formation of the slit 29 in the main body 25 makes it easier to displace the overlapping piece 27 in the orthogonal direction X.

Next, the structure of the first member 21 in a state in which the multiple units 20 are connected to each other will be described.
2 , the overlapping piece 27 of the first member 21 overlaps with the first member 21 of the other unit body 20 in a state in which the multiple unit bodies 20 are connected to each other. The overlapping piece 27 of one unit body 20 rides up onto the first member 21 of the other unit body 20. In the orthogonal direction X, the first member 21 of the other unit body 20 is interposed between the overlapping piece 27 of one unit body 20 and the shielding partition wall 11.

As shown in FIG. 6, the portion of the first member 21 where the overlapping piece 27 overlaps is called the overlapping portion 28. Each of the first members 21 of the multiple unit bodies 20 has an overlapping piece 27 and an overlapping portion 28. That is, the overlapping piece 27 of the first member 21 of one unit body 20 overlaps the overlapping portion 28 of the first member 21 of the other unit body 20. The overlapping portion 28 of the first member 21 of one unit body 20 overlaps the overlapping portion 28 of the first member 21 of the other unit body 20. The overlapping portion 28 is located on the opposite side to the overlapping piece 27 of the main body portion 25 in the first direction Y. In the first direction Y, the first recess 26 is located between the overlapping piece 27 of the main body portion 25 and the overlapping portion 28.

The first member 21 of one unit 20 is positioned 180 degrees rotated along the shielding partition wall 11 relative to the first member 21 of the other unit 20. When the multiple unit bodies 20 are connected to each other, the first recesses 26 of the multiple unit bodies 20 combine to form a circle. The diameter of the circle formed by the first recesses 26 of the multiple unit bodies 20 is larger than the inner diameter of the through hole 11h of the shielding partition wall 11. The first recesses 26 of the multiple unit bodies 20 surround the through hole 11h of the shielding partition wall 11 and the wiring 13 extending from the through hole 11h.

Along the long edge of the main body 25, excluding the positions where the first recess 26, the overlapping piece 27, and the overlapped portion 28 are formed, the end faces of the multiple unit bodies 20 are in contact with each other. As a result, the first members 21 of the multiple unit bodies 20 cover the periphery of the through hole 11h of the shielding partition wall 11.

[Structure of second member]
Next, the structure of the second member 22 in a state before the multiple units 20 are connected to each other will be described.

As shown in Figures 4 and 5, the second member 22 includes an erected portion 32 erected from the first member 21 in an erection direction S away from the shielding partition wall 11. In this embodiment, the erection direction S is the same direction as the perpendicular direction X. The erected portion 32 has a shape obtained by dividing a cylinder whose axis extends in the erection direction S into two in the circumferential direction. The erected portion 32 has a semicircular arc shape when viewed from the erection direction S.

As shown in FIG. 5, the second member 22 has an overlapping portion 33. The overlapping portion 33 is flat and extends from both ends of the standing portion 32 in the first direction Y. In this embodiment, the overlapping portion 33 is rectangular when viewed from the second direction Z. The long edge of the overlapping portion 33 extends in the perpendicular direction X. The short edge of the overlapping portion 33 extends in the first direction Y. The surface of the overlapping portion 33 that is connected to the inner surface 32a of the standing portion 32 is called the overlapping surface 33a. The surface of the overlapping portion 33 that is the reverse side of the overlapping surface 33a is called the non-overlapping surface 33b. The overlapping surface 33a and the non-overlapping surface 33b extend perpendicular to the second direction Z.

The overlapping portion 33 stands in the standing direction S of the standing portion 32 from the first member 21. Since both the standing portion 32 and the overlapping portion 33 stand in the standing direction S, the entire second member 22 stands in the standing direction S from the first member 21. The dimension of the overlapping portion 33 in the standing direction S is the same as the dimension of the standing portion 32 in the standing direction S.

The end of the second member 22 in the erection direction S is called the tip 22a. The end of the second member 22 located opposite the tip 22a is called the base end 22b. The tip 22a and the base end 22b extend entirely between one end and the other end of the second member 22 in the first direction Y. The end face of the base end 22b is in contact with the second surface 21b of the first member 21. The end face of the base end 22b corresponds to the end face of the second member 22 located on the first member 21 side.

The portion of the base end 22b located at the standing portion 32 is aligned with the first recess 26 of the main body portion 25. At least a portion of the inner surface 32a of the standing portion 32 may be flush with the end face of the main body portion 25 located at the first recess 26. The portion of the base end 22b located at the overlapping portion 33 is aligned with a portion of the long edge of the main body portion 25 located between the overlapping portion 28 and the first recess 26 in the first direction Y, and a portion located between the first recess 26 and the overlapping piece 27 in the first direction Y. At least a portion of the overlapping surface 33a may be flush with the end face of the main body portion 25.

Next, the structure of the second member 22 in a state in which the multiple units 20 are connected to each other will be described.
2 or 4 , the second member 22 of one unit 20 is positioned rotated 180 degrees along the shielding partition wall 11 with respect to the second member 22 of the other unit 20. When the multiple units 20 are connected to each other, the standing portion 32, together with the standing portions 32 of the second members 22 of the other unit units 20, forms a cylinder 35 surrounding the wiring 13. The inner diameter of the cylinder 35 is larger than the inner diameter of the through hole 11h of the shielding partition wall 11 and is the same as the diameter of the circle formed by the first recesses 26 of the multiple unit units 20.

As shown in FIG. 3, when the multiple unit bodies 20 are connected to each other, the overlapping portions 33 extend from both ends of the standing portion 32 in the circumferential direction of the cylindrical body 35 toward the outside of the cylindrical body 35. When the multiple unit bodies 20 are connected to each other, the overlapping portions 33 of the unit bodies 20 overlap each other. The overlapping surfaces 33a of the overlapping portions 33 contact each other between the unit bodies 20. In the standing direction S, the dimensions of the overlapping portions 33 and the standing portions 32 are the same, so it can be said that the overlapping portions 33 overlap over the entire second member 22 in the standing direction S.

[Structure of connecting member]
Next, the structure of the connecting member 23 in the state before the multiple units 20 are connected to each other will be described.

As shown in Figures 4 and 5, the connecting member 23 includes a facing portion 41 and a connecting piece 42. The facing portion 41 includes a flat first facing portion 51 extending along the first member 21 and a flat second facing portion 52 extending along the second member 22.

The first opposing portion 51 has a generally rectangular shape when viewed from the orthogonal direction X. The long edge of the first opposing portion 51 extends in the first direction Y. The short edge of the first opposing portion 51 extends in the second direction Z. The area of the first opposing portion 51 when viewed from the orthogonal direction X is smaller than that of the main body portion 25.

The first opposing portion 51 has a second recess 53 in which part of the edge is recessed. The second recess 53 is located in the middle of the long edge of the first opposing portion 51. The second recess 53 has a semicircular arc shape. The first opposing surface 51a, which is one side of the first opposing portion 51 in the orthogonal direction X, faces the second surface 21b. In other words, the opposing portion 41 faces the second surface 21b. The first opposing surface 51a extends perpendicular to the orthogonal direction X.

The second opposing portion 52 extends from the long edge of the first opposing portion 51. The second opposing portion 52 is located on both sides of the standing portion 32 in the first direction Y. The second opposing portion 52 has a substantially rectangular shape when viewed from the second direction Z. The long edge of the second opposing portion 52 extends in the perpendicular direction X. The short edge of the second opposing portion 52 extends in the first direction Y. The dimension of the second opposing portion 52 in the first direction Y is smaller than the dimension of the overlapping portion 33 in the first direction Y. The second opposing surface 52a, which is one surface of the second opposing portion 52, faces the non-overlapping surface 33b. The second opposing surface 52a extends perpendicular to the second direction Z.

The insertion hole 52h may be formed in the second opposing portion 52. The insertion hole 52h is a hole that penetrates the second opposing portion 52 in the second direction Z. The insertion hole 52h may be located, for example, in the middle of the second opposing portion 52 in the perpendicular direction X. The insertion hole 52h may be an elongated hole that extends in the perpendicular direction X.

The connecting member 23 is integrated with the first member 21. The connecting member 23 is integrated with the first member 21, for example, by adhering the first opposing surface 51a and the second surface 21b to each other with double-sided tape. The connecting member 23 may be integrated with the second member 22. The connecting member 23 is integrated with the second member 22 by adhering the second opposing surface 52a and the non-overlapping surface 33b to each other with double-sided tape. In this way, the connecting member 23 is integrated with the first member 21 and the second member 22, and the first member 21 and the second member 22 are connected by the connecting member 23.

As shown in FIG. 4, the connecting piece 42 extends from the opposing portion 41. More specifically, the connecting piece 42 extends from an end portion of one of the second opposing portions 52 in the perpendicular direction X. The connecting piece 42 protrudes from the tip 22a of the second member 22 in the erection direction S. More specifically, the connecting piece 42 protrudes from a portion of the tip 22a located at the overlapping portion 33. The connecting piece 42 has a pair of wall portions spaced apart from each other in the first direction Y, and a connecting portion connecting the tips of these wall portions.

In FIG. 7, the connecting piece 42 before the multiple unit bodies 20 are connected to each other is shown by a two-dot chain line. As shown in FIG. 7, the connecting piece 42 extends from the second opposing portion 52 in the perpendicular direction X.

Next, the structure of the connecting member 23 in a state in which a plurality of unit bodies 20 are connected to one another will be described.
As shown in Fig. 2 and Fig. 7, the connecting member 23 of one unit body 20 is rotated 180 degrees along the shielding partition wall 11 relative to the connecting member 23 of the other unit body 20. Fig. 7 shows the connecting piece 42 bent by plastic deformation with a solid line. Fig. 2 shows the connecting piece 42 after the multiple unit bodies 20 are connected to each other. The posture of the connecting piece 42 after the multiple unit bodies 20 are connected to each other is different from the posture of the connecting piece 42 before the multiple unit bodies 20 are connected to each other. The connecting piece 42 is bent by plastic deformation to connect with at least one of the connecting member 23 and the second member 22 of the other unit body 20. The connecting piece 42 of this embodiment connects with the second opposing portion 52 of the connecting member 23 of the other unit body 20.

As shown in FIG. 7, the second opposing portion 52 in one unit body 20 is sandwiched between the tip portion of the connecting piece 42 and the tip portion of the second opposing portion 52 in the other unit body 20. In detail, the second opposing portion 52 in the other unit body 20 and the overlapping portion 33 of the multiple unit bodies 20 are located between the tip portion of the connecting piece 42 and the tip portion of the second opposing portion 52 in one unit body 20. The portion of the second opposing portion 52 sandwiched by the connecting piece 42 is called the connected portion 54. The connected portion 54 is located in the second opposing portion 52 where the connecting piece 42 does not extend from the end in the orthogonal direction X, out of the two second opposing portions 52 in the unit body 20. The connected portion 54 is located at the tip of the second opposing portion 52 in the orthogonal direction X. In the first direction Y, the standing portion 32 is located between the connected portion 54 and the connecting piece 42.

Each of the connecting members 23 of the multiple unit bodies 20 has a connecting piece 42 and a connected portion 54. The connecting piece 42 of the connecting member 23 in one unit body 20 sandwiches the connected portion 54 of the connecting member 23 in the other unit body 20. The connected portion 54 of the connecting member 23 in one unit body 20 is sandwiched by the connecting piece 42 of the connecting member 23 in the other unit body 20.

When the multiple unit bodies 20 are connected to each other, the insertion hole 52h in the second opposing portion 52 of one unit body 20 overlaps with the insertion hole 52h in the second opposing portion 52 of the other unit body 20 in the second direction Z. In the second direction Z, the overlapping portion 33 of the multiple unit bodies 20 is located between the insertion hole 52h of one unit body 20 and the insertion hole 52h of the other unit body 20.

[Action]
Next, the operation of this embodiment will be described together with the method of attaching the shielding material unit 10 to the shielding partition wall 11.

The shielding unit 10 is integrated by connecting multiple units 20 together. The shielding unit 10 can be attached to the shielding partition wall 11 either before or after the wiring 13 is pulled in.

First, a case where the shielding unit 10 is attached to the shielding partition wall 11 before the wiring 13 is pulled in will be described. In this case, first, each of the multiple units 20 is attached to the shielding partition wall 11. When attaching the unit 20 to the shielding partition wall 11, the overlapping piece 27 is displaced in the orthogonal direction X and overlaps with the overlapping portion 28 of the other unit 20. The multiple units 20 are placed on the shielding partition wall 11 so that the through hole 11h of the shielding partition wall 11 is surrounded by the first recess 26 of the main body portion 25 of the multiple units 20. At this time, each of the multiple units 20 may be temporarily fixed to the shielding partition wall 11 by adhering the first surface 21a of the first member 21 to the shielding partition wall 11 with double-sided tape or the like.

Then, the connecting piece 42 of the connecting member 23 in each of the multiple unit bodies 20 is bent by an operator. The connecting piece 42 is easier to bend than a flat connecting piece because the tips of a pair of wall parts are connected to each other by a connecting part. By bending the connecting piece 42, the connecting member 23 is connected to the connecting member 23 of the other unit bodies 20, so that the multiple unit bodies 20 are connected to each other.

Then, the shielding unit 10 is attached to the shielding partition wall 11. The shielding unit 10 can be attached to the shielding partition wall 11, for example, by attaching the first member 21 to the shielding partition wall 11 with aluminum tape or by fixing the first member 21 to the shielding partition wall 11 with screws.

Furthermore, a screw may be inserted through the through hole 52h of the second opposing portion 52. The screw forcibly screwed through the through hole 52h in one unit body 20 penetrates the overlapping portion 33 of one unit body 20 and is forcibly screwed into the overlapping portion 33 of the other unit body 20. This makes it possible to more firmly connect the multiple unit bodies 20. The screw inserted into the through hole 52h is preferably made of lead.

After the shielding unit 10 is attached to the shielding partition wall 11 , the wiring 13 is pulled out from the through hole 11 h so as to pass through the inside of a cylindrical body 35 consisting of the upright portions 32 of multiple unit bodies 20 .
Next, a case where the shielding material unit 10 is attached to the shielding partition wall 11 after the wiring 13 is pulled out from the through hole 11h will be described. In this case, after the wiring 13 is pulled out from the through hole 11h, the unit body 20 is attached to the shielding partition wall 11 so that the erected portion 32 is aligned with the wiring 13 pulled out from the through hole 11h. The unit body 20 attached to the shielding partition wall 11 after the wiring 13 is pulled out may be one of the multiple unit bodies 20 or both of the multiple unit bodies 20. In the former case, the wiring 13 is pulled out from the through hole 11h after one of the unit bodies 20 is temporarily fixed to the shielding partition wall 11. The unit body 20 is attached to the shielding partition wall 11 in the same manner as in the case before the wiring 13 is pulled in. By attaching the shielding material unit 10 to the shielding partition wall 11, the wiring 13 is inserted into the inside of a cylinder 35 consisting of the erected portions 32 of the multiple unit bodies 20.

[effect]
According to the above embodiment, the following effects can be obtained.
(1) The shielding material unit 10 is composed of a plurality of units 20 that can be connected to each other. Therefore, the shielding material unit 10 can be easily attached to the shielding partition wall 11 either before or after the wiring 13 is pulled in. Since the shielding material unit 10 can be easily attached to the shielding partition wall 11 even after the wiring 13 is pulled in, the degree of freedom in the timing of attaching the shielding material unit 10 to the shielding partition wall 11 can be improved.

(2) The entire second member 22 stands upright from the first member 21 in the standing direction S. Therefore, the second member 22 does not have a portion that extends like a plate along the first member 21. There is no need to bend the second member 22 at the boundary between the portion of the second member 22 that runs along the first member 21 and the standing portion 32 that stands upright from the first member 21 in the standing direction S. Therefore, in the second member 22, it is possible to prevent the thickness of the shielding material at the bent portion from decreasing due to bending of the shielding material.

(3) The end face of the base end 22b of the second member 22 located on the first member 21 side is in contact with the second surface 21b of the first member 21. The entire base end 22b of the second member 22 is in contact with the second surface 21b of the first member 21. The second member 22 is not bent from the erected portion 32 that forms the cylindrical body 35 together with the other unit bodies 20 to follow the first member 21. Therefore, it is possible to prevent a decrease in shielding ability at the bent portion due to a decrease in the thickness of the shielding material accompanying bending.

(4) The first member 21 has an overlapping piece 27 that overlaps with the first member 21 of another unit body 20 in the orthogonal direction X. Therefore, the overlapping piece 27 allows the first members 21 to overlap each other. Such overlapping portions of the first members 21 are less likely to allow radiation to pass through than portions where the end faces of the first members 21 are in contact with each other. Therefore, by providing the first member 21 with the overlapping piece 27, leakage of radiation from the through hole 11h can be further suppressed.

(5) The second member 22 has an overlapping portion 33 where the unit bodies 20 overlap each other when the multiple unit bodies 20 are connected to each other. Therefore, the overlapping portion 33 allows the second members 22 to overlap each other. Such overlapping portions of the second members 22 are less likely to allow radiation to pass through than portions where the end faces of the second members 22 are in contact with each other. Therefore, by providing the second member 22 with the overlapping portion 33, leakage of radiation from the through hole 11h can be further suppressed.

(6) The overlapping portion 33 is a flat plate extending from both ends of the standing portion 32 in the circumferential direction of the cylinder 35 toward the outside of the cylinder 35 when the multiple unit bodies 20 are connected to each other. Therefore, the overlapping portion 33 can be positioned outside the cylinder 35. Compared to when the second member 22 has overlapping portions extending from both ends of the standing portion 32 in the circumferential direction of the cylinder 35, the area where the overlapping portions 33 overlap can be made larger. Therefore, leakage of radiation from the through hole 11h can be further suppressed.

(7) The connecting pieces 42 are bent by plastic deformation, and are thereby connected to the connecting members 23 of other unit bodies 20. Therefore, since the unit bodies 20 can be connected to each other by bending the connecting pieces 42, the work of connecting the unit bodies 20 to each other can be simplified compared to the case where the unit bodies 20 are connected to each other by screw fastening.

(8) The multiple unit bodies 20 have the same shape. Therefore, multiple unit bodies 20 can be manufactured without distinction of shape, which improves the efficiency of manufacturing the unit bodies 20.

[Example of change]
The above embodiment can be modified as follows: The above embodiment and the following modifications can be combined with each other to the extent that no technical contradiction occurs.

The multiple unit bodies 20 may have different shapes. In this case, at least one of the first member 21, the second member 22, and the connecting member 23 may be different between the unit bodies 20.

The shielding material unit 10 may be composed of three or more units 20 .
8, in the above modification, when the shielding material unit 10 is composed of three unit bodies 20, the standing portion 32 may have a shape obtained by dividing a cylinder whose axis extends in the standing direction S into three in the circumferential direction. In this case, the standing portion 32 forms a tubular body 35 together with the standing portions 32 of the other unit bodies 20 in a state in which the multiple unit bodies 20 are connected to each other. The overlapping portion 33 may extend to the outside of the tubular body 35 from both ends of the standing portion 32 in the circumferential direction of the tubular body 35.

As shown in FIG. 9, the overlapping portion 33 is not limited to extending from both ends of the standing portion 32 in the circumferential direction of the cylindrical body 35 to the outside of the cylindrical body 35. For example, the overlapping portion 33 may extend in the circumferential direction of the cylindrical body 35 from both ends of the standing portion 32 in the circumferential direction of the cylindrical body 35. In this case, the overlapping portion 33 is in the shape of a curved flat plate extending in the circumferential direction of the cylindrical body 35.

The dimension of the overlapping portion 33 in the vertical installation direction S may be different from the dimension of the vertical installation portion 32 in the vertical installation direction S. If the dimension of the overlapping portion 33 in the vertical installation direction S is smaller than the dimension of the vertical installation portion 32 in the vertical installation direction S, the end faces of the vertical installation portions 32 of the multiple unit bodies 20 may be in contact with each other in a portion of the vertical installation portion 32 in the vertical installation direction S.

The direction S of the erected portion 32 extending from the first member 21 may be a direction different from the perpendicular direction X.
The overlapping portion 33 may be omitted from the second member 22. In this case, the end faces of the erected portions 32 of the multiple unit bodies 20 may be in contact with each other.

Of the plurality of unit bodies 20, the first members 21 of some of the unit bodies 20 may include only the overlapping pieces 27, and the first members 21 of the remaining unit bodies 20 may include only the overlapping portions 28.
In some or all of the multiple unit bodies 20 , the formation of the overlapping pieces 27 and the overlapped portions 28 on the first members 21 may be omitted.

The second member 22 may have a flat portion extending along the first member 21. In this case, the second member 22 may be bent at the boundary between the portion of the second member 22 that extends along the first member 21 and the erected portion 32. At least a portion of the end face of the base end 22b of the second member 22 does not have to be in contact with the second surface 21b of the first member 21.

The inner diameter of the cylindrical body 35 may be equal to or smaller than the inner diameter of the through hole 11h of the shielding partition wall 11, or may be different from the diameter of the circle formed by the first recesses 26 of the multiple unit bodies 20. In other words, the inner diameter of the cylindrical body 35 can be changed within a range larger than the outer diameter of the wiring 13.

The diameter of the circle formed by the first recesses 26 of the multiple unit bodies 20 may be equal to or smaller than the inner diameter of the through hole 11h of the shielding partition wall 11. In other words, the diameter of the circle formed by the first recesses 26 of the multiple unit bodies 20 can be changed within a range greater than the outer diameter of the wiring 13.

The insertion hole 52h may be omitted from the connecting member 23.
In each of the multiple unit bodies 20, the connecting member 23 may have one second opposing portion 52. Even in this case, if the connecting member 23 has a connecting piece 42 extending from the second opposing portion 52, the unit bodies 20 can be connected to each other by bending the connecting piece 42. Furthermore, the connecting piece 42 may extend from an end of the second opposing portion 52 in the first direction Y, instead of from an end of the second opposing portion 52 in the orthogonal direction X.

The connection point of the connecting piece 42 may be the second member 22, or may be both the second member 22 and the connecting member 23. In short, the connecting piece 42 only needs to be bent by plastic deformation to connect to at least one of the connecting member 23 and the second member 22 in another unit body 20.

The connecting piece 42 may have a shape different from that of the above embodiment, such as a flat plate shape.
The connecting pieces 42 may be omitted from the connecting members 23. In this case, the units 20 are connected to each other by means other than the connecting pieces 42, such as screws.

The connecting member 23 may be made of a metal other than hot-dip galvanized steel plate.
The shielding material constituting the first member 21 and the shielding material constituting the second member 22 may be different materials. At least one of the first member 21 and the second member 22 may be made of a shielding material other than lead. In this case, examples of the shielding material include iron and tungsten.

The shielding compartment body may be a shielding compartment ceiling that blocks radiation, or a shielding compartment floor that blocks radiation.

S...standing direction, X...orthogonal direction, 10...shielding material unit, 11...shielding partition wall as a shielding partition body, 11h...through hole, 13...wiring, 20...unit body, 21...first member, 21a...first surface, 21b...second surface, 22...second member, 22a...tip, 22b...base end, 23...connecting member, 27...overlapping piece, 28...to be overlaid portion, 32...standing portion, 33...overlapping portion, 35...tubular body, 41...facing portion, 42...connecting piece.

Claims (9)

A shielding material unit that is attached to a shielding partition body that blocks radiation and has a through hole through which wiring is drawn out, in order to prevent leakage of radiation from the through hole,
The shielding unit is composed of a plurality of units that can be connected to each other,
The unit body is
a plate-shaped first member that is made of a shielding material that blocks radiation and faces the shielding partition;
a second member that is made of a shielding material that blocks radiation and is connected to the first member;
the second member includes an upright portion that stands upright from the first member in an upright direction away from the shielding partition,
A shielding material unit characterized in that, when a plurality of units are connected to each other, the standing portion, together with the standing portions of the second members of the other units, forms a cylindrical body surrounding the wiring. The shielding unit according to claim 1, wherein the entire second member stands upright from the first member in the standing direction. The first member has a first surface facing the shielding partition and a second surface positioned opposite to the first surface in a direction perpendicular to the first surface,
The shielding material unit according to claim 1 or 2, wherein an end face of the second member located on the side of the first member is in contact with the second surface. The shielding material unit according to any one of claims 1 to 3, wherein the first member has a first surface facing the shielding partition body, and includes an overlapping piece that overlaps the first member of another unit in a direction perpendicular to the first surface when the units are connected to each other. When the plurality of units are connected to each other, a portion where the overlapping piece of the first member of the other unit overlaps is called an overlapping portion.
The shielding material unit according to claim 4 , wherein the first member of the plurality of units comprises the overlapping piece and the overlapped portion. The shielding material unit according to any one of claims 1 to 5, wherein the second member has overlapping portions where the units overlap each other when the units are connected to each other. The shielding material unit according to claim 6, wherein the overlapping portion is a flat plate extending from both ends of the erected portion in the circumferential direction of the cylinder toward the outside of the cylinder when the multiple units are connected to each other. The first member has a first surface facing the shielding partition and a second surface positioned opposite to the first surface in a direction perpendicular to the first surface,
The shielding material unit includes a connecting member that connects the first member and the second member,
The connecting member includes a facing portion facing the second surface and a connecting piece extending from the facing portion and protruding from an end of the second member in the erecting direction,
A shielding material unit as described in any one of claims 1 to 7, wherein the connecting piece is bent by plastic deformation to connect to at least one of the connecting member and the second member in another unit body. The shielding material unit according to any one of claims 1 to 8, wherein the plurality of unit bodies are of the same shape.

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