Shielding material unit and electrical equipment installation structure

Abstract

To prevent an installation space of a shielding material unit from becoming excessive with respect to the size of an open hole formed in a shielding partition body.SOLUTION: A shielding material unit 10 prevents radiation from leaking from an open hole formed in a shielding ceiling 12. The shielding material unit 10 is composed of a plurality of unit bodies 20 that can be adjacent to each other in a second direction Y. The unit body 20 comprises a partition wall 21 that is arranged so as to surround the open hole and partitions an internal space of the shielding material unit 10, and an open end part 22 located at the end part of the unit body 20 in the second direction Y. The open end parts 22 of the two unit bodies 20 adjacent to each other in the second direction Y form an overlapping region R that overlaps each other in an orthogonal direction orthogonal to the partition wall 21. Of the two unit bodies 20 forming the overlapping region R, a relative position of one unit body 20 to the other unit body 20 in the second direction Y can be changed.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a shielding material unit and an electrical equipment installation structure.

Background Art

[0002] Patent Document 1 discloses a shielding wall as a shielding material unit. The shielding wall is arranged so as to surround the periphery of a through hole formed in a shielding partition body. By the shielding wall, leakage of radiation from the through hole formed in the shielding partition body is prevented. Switches, sockets, etc. are arranged in the internal space partitioned by the shielding wall.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The size of the through hole formed in the shielding partition body is changed according to various conditions such as the size of the electrical equipment installed inside the shielding material unit. If the size of the shielding material unit is set to be able to accommodate a large through hole, when the through hole formed in the shielding partition body is small, there is a risk that the installation space of the shielding material unit will be excessive with respect to the size of the through hole.

Means for Solving the Problems

[0005] The shielding material unit that solves the above problems is a shielding material unit that prevents leakage of radiation from a through-hole formed in a shielding partition that shields radiation. The shielding material unit is composed of a plurality of unit bodies that can be adjacent to each other in the adjacent direction. The unit body is disposed so as to surround the periphery of the through-hole and includes a partition wall that partitions the internal space of the shielding material unit and an opening end portion located at an end of the unit body in the adjacent direction. The partition wall includes a shielding material that shields radiation. The opening end portions of two unit bodies adjacent to each other in the adjacent direction form a overlapping region that overlaps with each other in a direction orthogonal to the partition wall. The gist is that the relative position in the adjacent direction of the other unit body with respect to one of the two unit bodies forming the overlapping region can be changed.

[0006] In the shielding material unit, among the overlapping regions that overlap with each other in the orthogonal direction, if one of the overlapping regions is referred to as a first overlapping region and the other overlapping region is referred to as a second overlapping region, at least a part of the first overlapping region and at least a part of the second overlapping region have a separated region that is separated from each other in the orthogonal direction, and a communication space that communicates the inside and outside of the internal space is preferably formed between the separated regions.

[0007] In the shielding material unit, the plurality of unit bodies are composed of two end unit bodies and an intermediate unit body disposed between the two end unit bodies in the adjacent direction. The first overlapping region is located in the intermediate unit body, and the second overlapping region is preferably located in at least one of the two end unit bodies.

[0008] In the shielding material unit, insertion holes into which bolt bodies can be inserted are formed in the first overlapping region and the second overlapping region, and the insertion hole formed in the first overlapping region and the insertion hole formed in the second overlapping region are preferably opposed to each other in the orthogonal direction.

[0009] In the shielding material unit, the insertion hole has an open end that opens in the adjacent direction at the edge of the opening end portion, and is in the shape of a long hole that extends in the adjacent direction away from the open end. The bolt body can be inserted into the insertion hole from the open end. A shielding sheet including a shielding material that covers portions of the insertion hole other than the portion into which the bolt body is inserted and shields radiation may be provided in a state where the bolt body is inserted into the insertion hole.

[0010] In the shielding material unit, at least a part of the first overlapping region and at least a part of the second overlapping region have a proximity region that is closer to each other in the orthogonal direction than the separation region. The insertion hole is formed in the proximity region of the first overlapping region and the second overlapping region. In a state where the bolt body is inserted into the insertion hole, portions of the insertion hole in the first overlapping region other than the portion into which the bolt body is inserted are covered by the proximity region of the second overlapping region, and portions of the insertion hole in the second overlapping region other than the portion into which the bolt body is inserted are covered by the proximity region of the first overlapping region.

[0011] In the shielding material unit, it is preferable that a cable connected to an electric device installed in the internal space can be wired in the communication space. In the shielding material unit, at least one of the plurality of unit bodies has a leg portion that protrudes outward from the unit body toward the outside of the internal space, and the leg portion is preferably supported by a support member that supports the shielding partition body.

[0012] In the shielding material unit, the partition wall preferably includes a shielding member formed of lead capable of shielding radiation and a protection member that protects the shielding member by covering at least the outer surface of the shielding member.

[0013] In the shielding material unit, a first end portion located on the shielding partition body side of the partition wall is flush with each other among the plurality of unit bodies, and the plurality of unit bodies can surround the periphery of the through hole by the first end portion.

[0014] The electrical equipment installation structure for solving the above problems is composed of a basic ceiling and a shielding ceiling that shields radiation and is separated downward from the basic ceiling. An electrical equipment is installed on the shielding ceiling in the double ceiling. In order to prevent radiation from leaking from the through-hole formed in the shielding ceiling for installing the electrical equipment, the shielding material unit described in claim 7 covers the through-hole within the double ceiling. The shielding ceiling is the shielding partition body, the through-hole is a long hole extending in the extending direction, the overlapping region where the communication space is formed is located on one side in the extending direction rather than at the center in the extending direction of the through-hole, in the overlapping region, the second overlapping region is located outside the shielding material unit compared to the first overlapping region, and the unit body forming the second overlapping region is on one side in the extending direction compared to the unit body forming the first overlapping region. This is the gist.

[0015] The electrical equipment installation structure for solving the above problems includes a basic ceiling, an electrical equipment installed on the shielding ceiling in a double ceiling composed of the basic ceiling and a shielding ceiling that shields radiation and is separated downward from the basic ceiling, a cable connected to the electrical equipment, a suspension bolt suspended from the basic ceiling, and a shielding material unit that covers the through-hole within the double ceiling in order to prevent radiation from leaking from the through-hole formed in the shielding ceiling for installing the electrical equipment. The shielding material unit is the shielding material unit described in claim 7, the shielding ceiling is the shielding partition body, two unit bodies forming the overlapping region are fixed to the suspension bolt, and the cable is drawn out from the inside to the outside of the internal space through the communication space. This is the gist.

Effect of the Invention

[0016] According to this invention, it is possible to suppress the installation space of the shielding material unit from becoming excessive with respect to the size of the through-hole formed in the shielding partition body.

Brief Description of the Drawings

[0017]

Figure 1

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Figure 10

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Figure 12

[0018] [First Embodiment] Hereinafter, a first embodiment in which a shielding material unit and an electrical equipment installation structure are embodied will be described.

[0019] [Installation Location of the Shielding Material Unit] As shown in FIG. 1, the shielding material unit 10 is installed between a base ceiling 11 as a base member and a shielding ceiling 12 as a shielding section for shielding radiation. The shielding material unit 10 is adjacent to the shielding ceiling 12. The shielding ceiling 12 is flat. The shielding ceiling 12 is spaced downward from the base ceiling 11. A double ceiling 11a is formed by the base ceiling 11 and the shielding ceiling 12. The direction orthogonal to the shielding ceiling 12 is also referred to as the first direction X. The direction along the shielding ceiling 12 is also referred to as the second direction Y. The direction along the shielding ceiling 12 and orthogonal to the second direction Y is also referred to as the third direction Z.

[0020] The shielding ceiling 12 includes a shielding material for shielding radiation. The shielding ceiling 12 is used, for example, as the ceiling of a room such as an X-ray room. Examples of the shielding material include materials capable of shielding X-rays and γ-rays such as lead and iron, materials capable of shielding neutrons such as polyethylene and boron-containing polyethylene, and materials combining these materials.

[0021] A through hole 12h is formed in the shielding ceiling 12. The through hole 12h is a long hole extending in the second direction Y along the shielding ceiling 12. The second direction Y corresponds to the extending direction. The dimension of the through hole 12h in the second direction Y is larger than the dimension of the through hole 12h in the third direction Z.

[0022] The upper surface 12a, which is one surface of the shielding ceiling 12 in the first direction X, and the lower surface 12b, which is the other surface, are planes orthogonal to the first direction X. The upper surface 12a faces the base ceiling 11 in the first direction X. The opening of the through hole 12h in the lower surface 12b may be closed by a closing member (not shown) from below. The through hole 12h of the shielding ceiling 12 is formed in the shielding ceiling 12 for installing the electrical equipment 14. Through the through hole 12h of the shielding ceiling 12, the electrical equipment 14 is installed between the shielding ceiling 12 and the base ceiling 11 from below the shielding ceiling 12. Examples of the electrical equipment 14 include lighting fixtures and air-conditioning equipment. A cable 14a is connected to the electrical equipment 14. Examples of the cable 14a include power lines and communication lines.

[0023] The shielding material unit 10 covers the through hole 12h within the double ceiling 11a in order to prevent radiation from leaking through the through hole 12h. The electrical equipment 14 is located inside the shielding material unit 10. The electrical equipment 14 is installed on the shielding ceiling 12 in the double ceiling 11a.

[0024] A suspension bolt 16 as a bolt body is provided between the base ceiling 11 and the shielding ceiling 12. The suspension bolt 16 includes a columnar shaft portion 17. The shaft portion 17 extends in the first direction X. One end of the shaft portion 17 is fixed to the base ceiling 11, and the other end has the electrical equipment 14 fixed thereto. Thereby, the suspension bolt 16 is suspended from the base ceiling 11. The electrical equipment 14 is supported by the base ceiling 11 by the suspension bolt 16.

[0025] As shown in FIG. 2, a support member 13 is provided between the base ceiling 11 and the shielding ceiling 12. The support member 13 includes a first support member 13a and a second support member 13b. The second support member 13b is provided at a position different from that of the first support member 13a in the direction away from the shielding ceiling 12. Note that the direction away from the shielding ceiling 12 is the direction away from the shielding ceiling 12 within the first direction X, which is the upward direction in FIG. 2.

[0026] The shielding ceiling 12 is supported by the base ceiling 11 by the first support member 13a and the second support member 13b. The first support member 13a and the second support member 13b are connected to at least one of the base ceiling 11 and the shielding ceiling 12. Note that the expression "at least one" used in this specification means "one or more" of the desired options. As an example, the expression "at least one" used in this specification means "only one option" or "both of the two options" if the number of options is two. As another example, the expression "at least one" used in this specification means "only one option" or "any combination of two or more options" if the number of options is three or more.

[0027] <Basic Configuration of Shielding Material Unit> As shown in FIG. 3, the shielding material unit 10 is composed of a plurality of unit bodies 20. The shielding material unit 10 of the present embodiment is composed of three unit bodies 20. The three unit bodies 20 can be adjacent to each other in the second direction Y corresponding to the adjacent direction. Among the second directions Y as the adjacent direction, one direction is referred to as the first adjacent direction Y1, and the direction opposite to the first adjacent direction Y1 is also referred to as the second adjacent direction Y2.

[0028] <Unit body> The unit body 20 includes a partition wall 21 and an opening end 22. The partition wall 21 is arranged so as to surround the periphery of the through hole 12h and partitions the internal space S1 (see FIG. 1) of the shielding material unit 10. The partition wall 21 includes a shielding material that shields radiation. The opening end 22 is located at the end of the unit body 20 in the second direction Y.

[0029] As shown in FIG. 4, the partition wall 21 includes a shielding member 21a formed of lead capable of shielding radiation and a protective member 21b that protects the shielding member 21a. The shielding member 21a is formed by bending a lead plate. The shielding member 21a has a three-dimensional shape. Of the two surfaces of the lead plate, one surface constitutes the inner surface 21c of the shielding member 21a, and the other surface constitutes the outer surface 21d of the shielding member 21a. The partition wall 21 has two layers of the shielding member 21a and the protective member 21b. The protective member 21b protects the shielding member 21a by covering the outer surface 21d of the shielding member 21a. The protective member 21b can maintain the shape of the shielding member 21a by being positioned along the shielding member 21a. The protective member 21b of the present embodiment is made of iron. The protective member 21b may be formed by bending an iron plate, for example.

[0030] The three unit bodies 20 are composed of two end unit bodies 41 and an intermediate unit body 31 arranged between the two end unit bodies 41 in the second direction Y. <Intermediate unit body> The partition wall 21 of the intermediate unit body 31 is referred to as the intermediate partition wall 32. The intermediate partition wall 32 is composed of two intermediate standing wall portions 33 as a plurality of standing wall portions and an intermediate ceiling wall portion 34 as a ceiling wall portion. Each of the two intermediate standing wall portions 33 has a first end portion 33a located on the side of the shielding ceiling 12 in the first direction X and a second end portion 33b located on the side opposite to the first end portion 33a in the direction away from the shielding ceiling 12. The intermediate standing wall portion 33 stands upright in the direction away from the shielding ceiling 12 between the first end portion 33a and the second end portion 33b. The two intermediate standing wall portions 33 are in a substantially rectangular flat plate shape extending orthogonal to the third direction Z. When viewed from the third direction Z, the two intermediate standing wall portions 33 are in a substantially rectangular shape with the longitudinal direction extending in the second direction Y. The two intermediate standing wall portions 33 are separated from each other in the third direction Z.

[0031] The intermediate ceiling wall portion 34 connects the second end portions 33b of the two intermediate standing wall portions 33. The intermediate ceiling wall portion 34 faces the shielding ceiling 12 in the first direction X. The intermediate ceiling wall portion 34 is in a substantially rectangular flat plate shape extending orthogonal to the first direction X. When viewed from the first direction X, the intermediate ceiling wall portion 34 is in a substantially rectangular shape with the longitudinal direction extending in the second direction Y.

[0032] The intermediate standing wall portion 33 has third intermediate edge portions 33c at both ends in the second direction Y. The intermediate ceiling wall portion 34 has intermediate ceiling wall edge portions 34c at both ends in the second direction Y. The opening end portion 22 of the intermediate unit body 31 is referred to as the intermediate opening end portion 37. The edge of the intermediate opening end portion 37 is formed by the third intermediate edge portions 33c of the two intermediate standing wall portions 33 and the intermediate ceiling wall edge portions 34c. The intermediate opening end portion 37 is located at both ends of the intermediate unit body 31 in the second direction Y. Thereby, the intermediate unit body 31 has a shape with both ends in the second direction Y open.

[0033] The two intermediate standing wall portions 33 form an intermediate opening 38 as an opening by the first end portions 33a. The intermediate opening 38 opens toward the shielding ceiling 12. The intermediate opening end portion 37 is formed by a part of the circumferential direction surrounding the intermediate opening 38 being missing in the intermediate standing wall portion 33. The intermediate opening end portion 37 and the intermediate opening 38 communicate with each other.

[0034] In the intermediate partition wall 32, a first insertion hole 32h as an insertion hole is formed. The first insertion hole 32h is a hole penetrating the intermediate partition wall 32. The first insertion hole 32h is formed in intermediate opening end portions 37 at both end portions of the intermediate ceiling wall portion 34 in the second direction Y.

[0035] The first insertion hole 32h has a first open end 32j as an open end. The first open end 32j opens in the second direction Y as an adjacent direction at an intermediate ceiling wall edge 34c which is an edge of the intermediate opening end portion 37. Specifically, in the first insertion hole 32h located at the intermediate ceiling wall edge 34c on the first adjacent direction Y1 side, the first open end 32j opens toward the first adjacent direction Y1 side. In the first insertion hole 32h located at the intermediate ceiling wall edge 34c on the second adjacent direction Y2 side, the first open end 32j opens toward the second adjacent direction Y2 side.

[0036] The shaft portion 17 of the suspension bolt 16 as a bolt body can be inserted into the first insertion hole 32h from the first open end 32j. The first insertion hole 32h is in the shape of a long hole extending in the second direction Y away from the first open end 32j. Specifically, the first insertion hole 32h located at the intermediate ceiling wall edge 34c on the first adjacent direction Y1 side extends in the second adjacent direction Y2 away from the first open end 32j. The first insertion hole 32h located at the intermediate ceiling wall edge 34c on the second adjacent direction Y2 side extends in the first adjacent direction Y1 away from the first open end 32j.

[0037] <End unit> The two end units 41 have the same configuration. Therefore, hereinafter, one end unit 41 will be described, and the description of the other end unit 41 will be omitted as appropriate.

[0038] The partition wall 21 of the end unit 41 is referred to as the end partition wall 42. The end partition wall 42 is composed of three end standing walls 43 as a plurality of standing wall parts and an end ceiling wall 44 as a ceiling wall part. Each of the three end standing walls 43 has a first end 43a located on the side of the shielding ceiling 12 in the first direction X and a second end 43b located on the side opposite to the first end 43a in the direction away from the shielding ceiling 12. The end standing wall 43 stands upright in the direction away from the shielding ceiling 12 between the first end 43a and the second end 43b. The dimension of the end standing wall 43 in the first direction X is larger than the dimension of the intermediate standing wall 33 in the first direction X.

[0039] Of the three end standing walls 43, two end standing walls 43 are substantially rectangular flat plates extending orthogonally to the third direction Z. These two end standing walls 43 are separated from each other in the third direction Z. These two end standing walls 43 are also referred to as the first end standing walls 45. The dimension in the third direction Z between the inner surfaces of the two first end standing walls 45 may be the same as the dimension in the third direction Z between the outer surfaces of the two intermediate standing walls 33, or may be larger than this dimension.

[0040] The end standing wall 43 other than the first end standing wall 45 is also referred to as the second end standing wall 46. The second end standing wall 46 is a substantially rectangular flat plate extending orthogonally to the second direction Y. The second end standing wall 46 is located at the end of the shielding material unit 10 in the second direction Y. Specifically, in the end unit 41 located on the first adjacent direction Y1 side of the intermediate unit 31, the second end standing wall 46 is located at the end of the shielding material unit 10 in the first adjacent direction Y1. In the end unit 41 located on the second adjacent direction Y2 side of the intermediate unit 31, the second end standing wall 46 is located at the end of the shielding material unit 10 in the second adjacent direction Y2.

[0041] The end ceiling wall 44 connects the second ends 43b of the three end standing walls 43. The end ceiling wall 44 faces the shielding ceiling 12 in the first direction X. The end ceiling wall 44 is a substantially rectangular flat plate extending orthogonally to the first direction X.

[0042] The two first standing wall portions 45 have a third edge 43c at one end in the second direction Y. The top wall portion 44 has a top wall edge 44c at one end in the second direction Y. The opening end 22 of the end unit body 41 is referred to as an end opening end 47. The edge of the end opening end 47 is formed by the third edges 43c of the two first standing wall portions 45 and the top wall edge 44c. The end opening end 47 is located at one end in the second direction Y of the end unit body 41. Specifically, in the end unit body 41 located on the Y1 side in the first adjacent direction with respect to the intermediate unit body 31, the end opening end 47 is located at the end in the second adjacent direction Y2 of the end unit body 41. In the end unit body 41 located on the Y2 side in the second adjacent direction with respect to the intermediate unit body 31, the end opening end 47 is located at the end in the first adjacent direction Y1 of the end unit body 41. Thereby, the end unit body 41 has a shape with one end in the second direction Y being open.

[0043] The two first standing wall portions 45 form an end opening 48 as an opening by the first end portions 43a. The end opening 48 opens toward the shielding ceiling 12. The end opening end 47 is formed by a part of the circumferential direction surrounding the end opening 48 being missing among the standing wall portions 43. The end opening end 47 and the end opening 48 communicate with each other.

[0044] A second insertion hole 42h as an insertion hole is formed in the end partition wall 42. The second insertion hole 42h is a hole penetrating the end partition wall 42. The second insertion hole 42h is formed at the end opening end 47 at the end in the second direction Y of the top wall portion 44.

[0045] The second insertion hole 42h has a second open end 42j as an open end. The second open end 42j opens in the second direction Y as an adjacent direction at the end edge 44c of the end ceiling wall which is the edge of the end opening end 47. Specifically, in the second insertion hole 42h located in the end unit 41 on the first adjacent direction Y1 side among the two end units 41, the second open end 42j opens toward the second adjacent direction Y2 side. In the second insertion hole 42h located in the end unit 41 on the second adjacent direction Y2 side among the two end units 41, the second open end 42j opens toward the first adjacent direction Y1 side.

[0046] The shaft portion 17 of the suspension bolt 16 as a bolt body can be inserted into the second insertion hole 42h from the second open end 42j. The second insertion hole 42h is in the shape of a long hole extending in the second direction Y as an adjacent direction away from the second open end 42j. Specifically, the second insertion hole 42h located in the end unit 41 on the first adjacent direction Y1 side among the two end units 41 extends in the first adjacent direction Y1 away from the second open end 42j. The second insertion hole 42h located in the end unit 41 on the second adjacent direction Y2 side among the two end units 41 extends in the second adjacent direction Y2 away from the second open end 42j.

[0047] <Leg portion> The intermediate unit 31 and the two end units 41 each have a leg portion 51 protruding outward from the internal space S1 from each unit body 20. The leg portion 51 in the intermediate unit 31 is located on the intermediate standing wall portion 33. The leg portion 51 in the end unit 41 is located on the first end standing wall portion 45.

[0048] The leg portion 51 is formed on the protective member 21b. The protective member 21b is made of metal. For example, the protective member 21b of the present embodiment is made of iron. Therefore, the position of the leg portion 51 in the first direction X can be changed by plastic deformation. When the leg portion 51 is displaced, the shape of the shielding member 21a is maintained by the portion of the protective member 21b other than the leg portion 51.

[0049] As shown in FIG. 2, the leg portion 51 is supported by the support member 13. The leg portion 51 can change the support member 13 supported by the first support member 13a and the second support member 13b by being displaced in a direction away from the shielding ceiling 12.

[0050] The leg portion 51 has a first component portion 52 and a second component portion 53. The first component portion 52 is in a flat plate shape extending so as to be orthogonal to the third direction Z. A bolt hole 52h is formed in the first component portion 52. The second component portion 53 is in a flat plate shape extending so as to be orthogonal to the first direction X. The second component portion 53 protrudes outward from the unit body 20. A bolt hole 53h is formed in the second component portion 53.

[0051] For example, when the leg portion 51 is supported by the first support member 13a, the second component portion 53 is placed on the upper portion of the first support member 13a by an operator. In this state, by inserting a bolt (not shown) into the bolt hole 53h of the second component portion 53, the leg portion 51 can be supported by the first support member 13a with the bolt.

[0052] For example, when the leg portion 51 is supported by the second support member 13b, the second component portion 53 is displaced by the operator so as to be away from the shielding ceiling 12 in the first direction X. At this time, as the position of the second component portion 53 moves away from the shielding ceiling 12, starting from the end portion of the first component portion 52 above the first direction X, the first component portion 52 deforms so as to move away from the unit body 20 in the third direction Z. While the second component portion 53 is being displaced in this way, at least one of the first component portion 52 and the second component portion 53 is placed on the upper portion of the second support member 13b by the operator. In this state, by inserting a bolt (not shown) into the bolt hole 52h of the first component portion 52 or the bolt hole 53h of the second component portion 53, the leg portion 51 can be supported by the second support member 13b with the bolt.

[0053] <Positional relationship of the unit body> As shown in Fig. 1, the first end portion 33a of the intermediate partition wall 32 located on the side of the shielding ceiling 12 and the first end portion 43a of the end partition wall 42 located on the side of the shielding ceiling 12 are flush with each other among the three unit bodies 20. In other words, the first end portion 33a of the intermediate partition wall 32 and the first end portion 43a of the end partition wall 42 have the same distance from the base ceiling 11 in the first direction X. The first end portion 33a of the intermediate partition wall 32 and the first end portion 43a of the end partition wall 42 are in contact with the upper surface 12a of the shielding ceiling 12 around the through hole 12h. The three unit bodies 20 can surround the periphery of the through hole 12h by the first end portions 33a and 43a.

[0054] The intermediate ceiling portion 34 of the intermediate unit body 31 and the end ceiling portions 44 of the two end unit bodies 41 are different from each other in position in the first direction X. In the present embodiment, the end ceiling portion 44 is farther from the shielding ceiling 12 than the intermediate ceiling portion 34 in the first direction X.

[0055] <Overlapping region> As shown in Fig. 2, the intermediate opening end portion 37 of the intermediate unit body 31 and the end opening end portion 47 of the end unit body 41 overlap each other. The overlapping portion of the intermediate opening end portion 37 and the end opening end portion 47 is called an overlapping region R. Among the overlapping regions R that overlap each other, one overlapping region R is called a first overlapping region R1, and the other overlapping region R is called a second overlapping region R2. In the present embodiment, the overlapping region R located in the intermediate unit body 31 is also called the first overlapping region R1. The overlapping region R located in the end unit body 41 is also called the second overlapping region R2.

[0056] The intermediate unit body 31 and the end unit body 41 correspond to two unit bodies 20 adjacent to each other in the second direction Y as the adjacent direction. The intermediate opening end portion 37 of the intermediate unit body 31 having the first overlapping region R1 opens toward the end unit body 41 having the second overlapping region R2 in the second direction Y. The end opening end portion 47 of the end unit body 41 having the second overlapping region R2 opens toward the intermediate unit body 31 having the first overlapping region R1 in the second direction Y.

[0057] The first insertion hole 32h of the intermediate unit body 31 is located at the intermediate opening end 37. Therefore, it can be said that the first insertion hole 32h as an insertion hole is formed in the first overlapping region R1. The second insertion hole 42h of the end unit body 41 is located at the end opening end 47. Therefore, it can be said that the second insertion hole 42h as an insertion hole is formed in the second overlapping region R2. Note that the shaft portion 17 of the suspension bolt 16 as a bolt body can be inserted into the first insertion hole 32h and the second insertion hole 42h.

[0058] The second overlapping region R2 is located in both of the two end unit bodies 41. That is, the intermediate opening end 37 located on the first adjacent direction Y1 side in the intermediate unit body 31 overlaps with the end opening end 47 of the end unit body 41 located on the first adjacent direction Y1 side with respect to the intermediate unit body 31. The intermediate opening end 37 located on the second adjacent direction Y2 side in the intermediate unit body 31 overlaps with the end opening end 47 of the end unit body 41 located on the second adjacent direction Y2 side with respect to the intermediate unit body 31. The end opening end 47 overlaps with the intermediate opening end 37 so as to cover from the outside of the intermediate unit body 31. Therefore, in the overlapping region R, the second overlapping region R2 is located outside the shielding material unit 10 with respect to the first overlapping region R1.

[0059] The end of the intermediate standing wall portion 33 in the second direction Y and the end of the first end standing wall portion 45 in the second direction Y overlap each other. The end of the intermediate ceiling wall portion 34 in the second direction Y and the end of the end ceiling wall portion 44 in the second direction Y overlap each other. The first overlapping region R1 is composed of both ends of the two intermediate standing wall portions 33 in the second direction Y and both ends of the intermediate ceiling wall portion 34 in the second direction Y. The second overlapping region R2 is composed of the ends of the two first end standing wall portions 45 in the second direction Y and the end of the end ceiling wall portion 44 on the intermediate unit body 31 side in the second direction Y.

[0060] The first overlapping region R1 of the intermediate standing wall portion 33 and the second overlapping region R2 of the first end standing wall portion 45 overlap each other in the third direction Z. The third direction Z corresponds to a direction orthogonal to the intermediate standing wall portion 33 and the first end standing wall portion 45. The first overlapping region R1 of the intermediate top wall portion 34 and the second overlapping region R2 of the end top wall portion 44 overlap each other in the first direction X. The first direction X corresponds to a direction orthogonal to the intermediate top wall portion 34 and the end top wall portion 44. Therefore, it can be said that the opening end portions 22 of the two unit bodies 20 adjacent to each other in the second direction Y as the adjacent direction form an overlapping region R that overlaps each other in the direction orthogonal to the partition wall 21.

[0061] Among the two unit bodies 20 forming the overlapping region R, the relative position in the second direction Y as the adjacent direction of the other unit body 20 with respect to one unit body 20 can be changed. In the present embodiment, the relative position of the end unit body 41 with respect to the intermediate unit body 31 in the second direction Y can be changed. When the relative position of the end unit body 41 with respect to the intermediate unit body 31 is changed so as to be away from the intermediate unit body 31 in the second direction Y, the dimensions of the first overlapping region R1 and the second overlapping region R2 in the second direction Y become smaller. When the relative position of the end unit body 41 with respect to the intermediate unit body 31 is changed so as to approach the intermediate unit body 31 in the second direction Y, the dimensions of the first overlapping region R1 and the second overlapping region R2 in the second direction Y become larger.

[0062] Of the two end units 41, the end unit 41 located on the first adjacent direction Y1 side is on the first adjacent direction Y1 side of the intermediate unit 31. Of the two end units 41, the end unit 41 located on the second adjacent direction Y2 side is on the second adjacent direction Y2 side of the intermediate unit 31. Of the two intermediate opening ends 37 of the intermediate unit 31, the intermediate opening end 37 located on the first adjacent direction Y1 side is offset toward the first adjacent direction Y1 side from the center of the second direction Y of the through hole 12h. Of the two intermediate opening ends 37 of the intermediate unit 31, the intermediate opening end 37 located on the second adjacent direction Y2 side is offset toward the second adjacent direction Y2 side from the center of the second direction Y of the through hole 12h. Therefore, it can be said that the first overlapping region R1 of the intermediate opening end 37 and the second overlapping region R2 of the end opening end 47 overlapping with the first overlapping region R1 are offset in the second direction Y from the center of the second direction Y as the adjacent direction of the through hole 12h. Note that the second direction Y is also the extending direction in which the long hole-shaped through hole 12h formed in the shielding ceiling 12 extends. Therefore, it can also be said that the overlapping region R is offset to one side in the extending direction from the center in the extending direction of the through hole 12h. It can also be said that the unit 20 forming the second overlapping region R2 is on one side in the extending direction from the unit 20 forming the first overlapping region R1. In the present embodiment, since the overlapping regions R are formed on both sides of the intermediate unit 31, it can also be said that, when viewed from the entire shielding material unit 10, the overlapping region R is offset to one side in the second direction Y from the center of the second direction Y as its extending direction.

[0063] <Separation region> As shown in Fig. 5, since the positions of the intermediate ceiling wall portion 34 and the end ceiling wall portion 44 in the first direction X are different from each other, the first overlapping region R1 of the intermediate ceiling wall portion 34 and the second overlapping region R2 of the end ceiling wall portion 44 are different from each other in the position in the first direction X. The second overlapping region R2 of the end ceiling wall portion 44 is farther from the shielding ceiling 12 in the first direction X than the first overlapping region R1 of the intermediate ceiling wall portion 34. The first overlapping region R1 of the intermediate ceiling wall portion 34 and the second overlapping region R2 of the end ceiling wall portion 44 are separated from each other in the first direction X. The first overlapping region R1 of the intermediate standing wall portion 33 and the second overlapping region R2 of the first end standing wall portion 45 may be in contact with each other. Thus, it can be said that a part of the first overlapping region R1 and a part of the second overlapping region R2 have a separation region R3 that is separated from each other in the first direction X as the orthogonal direction. The second overlapping region R2 of the end ceiling wall portion 44 and the first overlapping region R1 of the intermediate ceiling wall portion 34 correspond to the separation region R3.

[0064] As shown in Fig. 1, a communication space S2 for communicating the inside and outside of the internal space S1 is formed between the separation regions R3. The communication space S2 is a space formed between the separation region R3 of the intermediate ceiling wall portion 34 and the separation region R3 of the end ceiling wall portion 44. The communication space S2 communicates with the inside of the end unit body 41. The overlapping region R in which the communication space S2 is formed is located on one side in the second direction Y as the extending direction, rather than at the center in the extending direction of the through hole 12h.

[0065] A cable 14a connected to the electric device 14 installed in the internal space S1 can be wired in the communication space S2. The cable 14a extends from the electric device 14 toward the communication space S2 in the internal space S1. The cable 14a is drawn out from the inside to the outside of the internal space S1 through the communication space S2. The cable 14a extending to the outside of the internal space S1 may be fixed to a suspension bolt 16 or the like outside the shielding material unit 10.

[0066] <Position relationship of the insertion hole> As shown in FIG. 6, a first insertion hole 32h as an insertion hole formed in the first polymerization region R1 and a second insertion hole 42h as an insertion hole formed in the second polymerization region R2 face each other in a first direction X as an orthogonal direction.

[0067] A shaft portion 17 of a suspension bolt 16 as a bolt body may be inserted into the first insertion hole 32h and the second insertion hole 42h that face each other in the first direction X. With the suspension bolt 16 inserted into the first insertion hole 32h and the second insertion hole 42h, an intermediate unit body 31 and an end unit body 41 can be fixed to the suspension bolt 16 by fastening a nut (not shown) to the suspension bolt 16. In other words, two unit bodies 20 forming the polymerization region R are fixed to the suspension bolt 16.

[0068] The suspension bolt 16 can be inserted into the first insertion hole 32h from a first open end 32j formed at an intermediate ceiling edge 34c. The suspension bolt 16 can be inserted into the second insertion hole 42h from a second open end 42j formed at an end ceiling edge 44c.

[0069] For example, the intermediate unit body 31 and the end unit body 41 are attached to the suspension bolt 16 installed between the base ceiling 11 and the shielding ceiling 12. When the intermediate unit body 31 is attached to the suspension bolt 16, an operator displaces the intermediate unit body 31 in a second direction Y so that an intermediate opening end 37 approaches the suspension bolt 16. While displacing the intermediate unit body 31, the suspension bolt 16 is inserted through the first insertion hole 32h from the first open end 32j. When the end unit body 41 is attached to the suspension bolt 16, an operator displaces the end unit body 41 in the second direction Y so that an end opening end 47 approaches the suspension bolt 16. While displacing the end unit body 41, the suspension bolt 16 is inserted through the second insertion hole 42h from the second open end 42j.

[0070] <Shielding sheet> The shielding material unit 10 includes a shielding sheet 60 containing a shielding material for shielding radiation. The shielding sheet 60 covers portions other than the portions where the suspension bolts 16 are inserted in the first insertion hole 32h and / or the second insertion hole 42h, which are insertion holes, in a state where the suspension bolts 16 are inserted into the first insertion hole 32h and the second insertion hole 42h.

[0071] In the present embodiment, the installation positions of the shielding sheet 60 are different between the overlapping region R located on the first adjacent direction Y1 side of the shielding material unit 10 and the overlapping region R located on the second adjacent direction side. First, with reference to FIGS. 6 and 7, the installation position of the shielding sheet 60 in the overlapping region R located on the first adjacent direction Y1 side of the shielding material unit 10 will be described.

[0072] As shown in FIGS. 6 and 7, in the overlapping region R located on the first adjacent direction Y1 side of the shielding material unit 10, the end of the first insertion hole 32h on the side opposite to the first open end 32j and the end of the second insertion hole 42h on the side opposite to the second open end 42j face each other. The suspension bolts 16 are inserted into the portions of the first insertion hole 32h and the second insertion hole 42h that face each other in this way.

[0073] Among the first insertion holes 32h, the portion that does not face the second insertion hole 42h faces the end top wall portion 44 forming the second overlapping region R2 in the first direction X. As a result, the portion of the first insertion hole 32h other than the portion where the suspension bolt 16 is inserted faces the end top wall portion 44 in the first direction X.

[0074] Among the second insertion holes 42h, the portion that does not face the first insertion hole 32h faces the intermediate top wall portion 34 forming the first overlapping region R1 in the first direction X. As a result, the portion of the second insertion hole 42h other than the portion where the suspension bolt 16 is inserted faces the intermediate top wall portion 34 in the first direction X. The portion of the second insertion hole 42h other than the portion where the suspension bolt 16 is inserted is covered by the shielding sheet 60 from above. This shielding sheet 60 is attached to the upper surface of the end top wall portion 44 so as to block a part of the second insertion hole 42h including the second open end 42j.

[0075] Next, with reference to FIGS. 8 and 9, the installation position of the shielding sheet 60 in the overlapping region R located on the second adjacent direction Y2 side of the shielding material unit 10 will be described. As shown in FIGS. 8 and 9, in the overlapping region R located on the second adjacent direction Y2 side of the shielding material unit 10, the end of the first insertion hole 32h on the side opposite to the first open end 32j and the end of the second insertion hole 42h on the side opposite to the second open end 42j face each other. The suspension bolt 16 is inserted into the portions of the first insertion hole 32h and the second insertion hole 42h that face each other in this way.

[0076] Among the first insertion holes 32h, the portion that does not face the second insertion hole 42h faces the end ceiling wall portion 44 forming the second overlapping region R2 in the first direction X. As a result, a part of the first insertion hole 32h other than the portion where the suspension bolt 16 is inserted faces the end ceiling wall portion 44 in the first direction X. The other portion of the first insertion hole 32h faces the second insertion hole 42h. The portion of the first insertion hole 32h other than the portion where the suspension bolt 16 is inserted is covered by the shielding sheet 60 from above. This shielding sheet 60 is attached to the upper surface of the intermediate ceiling wall portion 34 so as to block a part of the first insertion hole 32h including the first open end 32j.

[0077] Among the second insertion holes 42h, the portion that does not face the first insertion hole 32h faces the intermediate ceiling wall portion 34 forming the first overlapping region R1 in the first direction X. As a result, a part of the second insertion hole 42h other than the portion where the suspension bolt 16 is inserted faces the intermediate ceiling wall portion 34 in the first direction X. The other portion of the second insertion hole 42h faces the first insertion hole 32h. A part of the second insertion hole 42h other than the portion where the suspension bolt 16 is inserted is covered by the shielding sheet 60 from above. This shielding sheet 60 is attached to the upper surface of the end ceiling wall portion 44 so as to block a part of the second insertion hole 42h including the second open end 42j.

[0078] [Operation of the First Embodiment] Next, the operation of this embodiment will be described. The intermediate unit 31 and the end unit 41 are adjacent to each other in the second direction Y as the adjacent direction. In this way, the intermediate opening end 37 of the adjacent intermediate unit 31 and the end opening end 47 of the end unit 41 overlap each other. The relative position of the end unit 41 with respect to the intermediate unit 31 in the second direction Y is changeable. In response to such a change in the relative position, the first overlapping region R1, which is the region of the intermediate opening end 37 that overlaps the end opening end 47, and the second overlapping region R2, which is the region of the end opening end 47 that overlaps the intermediate opening end 37, increase or decrease in dimension in the second direction Y. Along with the increase or decrease in the dimension of the first overlapping region R1 and the second overlapping region R2 in the second direction Y, the dimension of the shielding material unit 10 in the second direction Y can be increased or decreased.

[0079] [Effects of the First Embodiment] According to the above embodiment, the following effects can be obtained. (1-1) The opening ends 22 of the two units 20 adjacent to each other in the second direction Y form an overlapping region R that overlaps each other in the orthogonal direction orthogonal to the partition wall 21. Among the two units 20 forming the overlapping region R, the relative position of the other unit 20 with respect to one unit 20 in the second direction Y is changeable. Therefore, in the two units 20 adjacent to each other in the second direction Y, by increasing or decreasing the dimension of the overlapping region R in the second direction Y, the dimension of the shielding material unit 10 in the second direction Y can be increased or decreased. Therefore, when the through-hole 12h formed in the shielding ceiling 12 is small, the dimension of the shielding material unit 10 in the second direction Y can be decreased according to the size of the through-hole 12h. Accordingly, it is possible to suppress the installation space of the shielding material unit 10 from becoming excessive with respect to the size of the through-hole 12h formed in the shielding ceiling 12.

[0080] (1-2) The first overlapping region R1 and the second overlapping region R2 have a separation region R3 that is separated from each other in the orthogonal direction. A communication space S2 that connects the inside and outside of the internal space S1 is formed between the separation regions R3. Therefore, the cable 14a can be extended inside and outside the internal space S1 through the communication space S2. When the electrical equipment 14 inside the shielding material unit 10 generates heat, the heated air can be discharged to the outside of the internal space S1 through the communication space S2.

[0081] (1-3) The plurality of unit bodies 20 are composed of two end unit bodies 41 and an intermediate unit body 31 disposed between the two end unit bodies 41 in the second direction Y. The first overlapping region R1 is located in the intermediate unit body 31. The second overlapping region R2 is located in the two end unit bodies 41. Therefore, compared with the case where the shielding material unit 10 is composed of two unit bodies 20, the size of each unit body 20 can be reduced, making it easier for the operator to handle the unit body 20 when installing the shielding material unit 10.

[0082] (1-4) The first insertion hole 32h formed in the first overlapping region R1 and the second insertion hole 42h formed in the second overlapping region R2 are insertion holes into which the suspension bolt 16 can be inserted. The first insertion hole 32h and the second insertion hole 42h face each other in the first direction X. Therefore, by inserting a common suspension bolt 16 through the first insertion hole 32h formed in the first overlapping region R1 and the second insertion hole 42h formed in the second overlapping region R2, two unit bodies 20 adjacent to each other in the second direction Y can be fixed to the common suspension bolt 16.

[0083] (1-5) The shielding material unit 10 includes a shielding sheet 60 that contains a shielding material for shielding radiation. The shielding sheet 60 covers the portion of the first insertion hole 32h other than the portion where the suspension bolt 16 is inserted when the suspension bolt 16 is inserted into the first insertion hole 32h. The shielding sheet 60 covers the portion of the second insertion hole 42h other than the portion where the suspension bolt 16 is inserted when the suspension bolt 16 is inserted into the second insertion hole 42h. Therefore, the shielding sheet 60 can suppress the leakage of radiation through the first insertion hole 32h and the second insertion hole 42h.

[0084] (1-6) The unit body 20 has a leg portion 51 that protrudes outward from the unit body 20 toward the outside of the internal space S1. The leg portion 51 is supported by a support member 13 that supports the shielding ceiling 12. Therefore, by fixing the leg portion 51 to the support member 13, the shielding material unit 10 can be installed in a stable posture.

[0085] (1-7) The partition wall 21 includes a shielding member 21a formed of lead capable of shielding radiation, and a protection member 21b that protects the shielding member 21a by covering the outer surface 21d of the shielding member 21a. Therefore, even if an impact acts on the shielding material unit 10 from the outside of the shielding material unit 10, the deformation of the shielding member 21a can be suppressed by the protection member 21b.

[0086] (1-8) The first end portions 33a, 43a of the partition wall 21 located on the side of the shielding ceiling 12 are flush with each other among the plurality of unit bodies 20. The plurality of unit bodies 20 can surround the periphery of the through hole 12h by the first end portions 33a, 43a. Therefore, since the periphery of the through hole 12h can be surrounded by the first end portions 33a, 43a in a state where the first end portions 33a, 43a are in contact with the shielding ceiling 12, the radiation shielding effect of the shielding material unit 10 can be further enhanced.

[0087] (1-9) The overlapping region R in which the communication space S2 is formed is located on one side in the second direction Y rather than the center in the second direction Y of the through hole 12h. The second overlapping region R2 is located outside the shielding material unit 10 rather than the first overlapping region R1. The unit body 20 forming the second overlapping region R2 is on one side in the second direction Y as the extending direction rather than the unit body 20 forming the first overlapping region R1. Therefore, the through hole 12h, which is a long hole extending in the second direction Y as the extending direction, can be covered by the shielding material unit 10. In addition, since the space inside the intermediate unit body 31, which is the unit body 20 having the first overlapping region R1, and the communication space S2 can be communicated with each other in a bent shape in the middle, leakage of radiation to the outside of the shielding material unit 10 through the communication space S2 can be prevented.

[0088] (1-10) The first overlapping region R1 that overlaps with the (1-10) end opening end portion 47 is located at both ends of the intermediate unit body 31 in the second direction Y. Therefore, compared with the case where there is one first overlapping region R1, there are more locations where the dimension of the overlapping region R in the second direction Y can be adjusted. Thus, according to the dimension of the through hole 12h formed in the shielding ceiling 12 in the second direction Y, the dimension of the shielding material unit 10 in the second direction Y can be adjusted within a wider range of dimension ranges.

[0089] (1-11) The partition wall 21 is composed of two layers, namely a shielding member 21a made of a lead plate and a protection member 21b made of an iron plate. Therefore, by commonly using the protection member 21b and changing the thickness of the lead plate, the radiation shielding ability of the shielding member 21a can be easily increased partially or entirely.

[0090] [Second Embodiment] Hereinafter, a second embodiment in which the shielding material unit and the electrical equipment installation structure are embodied will be described. The shielding material unit 10 in the second embodiment is different in the shape of the intermediate unit body 31 from the first embodiment. Hereinafter, the description will focus on the differences from the first embodiment. For the same configurations as those in the first embodiment, the same reference numerals will be given and the description will be omitted as appropriate.

[0091] <Intermediate Unit Body> As shown in FIG. 10, in the intermediate unit body 31 of the present embodiment, the intermediate ceiling portion 34 is composed of a first intermediate ceiling portion 71, a second intermediate ceiling portion 72, and a third intermediate ceiling portion 73. The first intermediate ceiling portion 71 is a rectangular flat plate extending from the second end portion 33b of the two intermediate standing wall portions 33. The second intermediate ceiling portion 72 is a rectangular flat plate extending from the end portion of the first intermediate ceiling portion 71 in the third direction Z. The second intermediate ceiling portion 72 extends so as to be orthogonal to the third direction Z. The third intermediate ceiling portion 73 is a rectangular flat plate extending from the end portion of the second intermediate ceiling portion 72 in the first direction X. The third intermediate ceiling portion 73 extends so as to be orthogonal to the first direction X.

[0092] <Separation Region and Proximity Region> The first overlapping region R1 of the first intermediate ceiling portion 71 and the second overlapping region R2 of the end ceiling portion 44 are separated from each other in the first direction X. In the present embodiment, the first overlapping region R1 of the first intermediate ceiling portion 71 and the second overlapping region R2 of the portion of the end ceiling portion 44 that faces the first intermediate ceiling portion 71 in the first direction X correspond to the separation region R3. A communication space S2 that communicates the inside and outside of the internal space S1 is formed between these separation regions R3.

[0093] The positions of the first intermediate ceiling portion 71 and the third intermediate ceiling portion 73 in the first direction X are different from each other. The third intermediate ceiling portion 73 is located closer to the end ceiling portion 44 in the first direction X than the first intermediate ceiling portion 71. The first overlapping region R1 of the third intermediate ceiling portion 73 and the second overlapping region R2 of the end ceiling portion 44 may be in contact with each other in the first direction X. In the present embodiment, the first overlapping region R1 of the third intermediate ceiling portion 73 and the second overlapping region R2 of the portion of the end ceiling portion 44 that faces the third intermediate ceiling portion 73 in the first direction X correspond to the proximity region R4. The proximity region R4 refers to the first overlapping region R1 and the second overlapping region R2 that are closer to each other than the separation region R3 in the first direction X as the orthogonal direction. It can be said that a part of the first overlapping region R1 and a part of the second overlapping region R2 have the proximity region R4.

[0094] <The first insertion hole and the second insertion hole> As shown in FIGS. 11 and 12, the first insertion hole 32h is formed in the proximity region R4 of the third intermediate ceiling portion 73. The second insertion hole 42h is formed in the proximity region R4 of the end ceiling portion 44. The end of the first insertion hole 32h on the side opposite to the first open end 32j and the end of the second insertion hole 42h on the side opposite to the second open end 42j face each other in the first direction X. The suspension bolt 16 is inserted into the portion of the first insertion hole 32h and the portion of the second insertion hole 42h that face each other in this way.

[0095] Of the first insertion hole 32h, the portion that does not face the second insertion hole 42h faces the end top wall portion 44 forming the proximity region R4 in the first direction X. As a result, the portion of the first insertion hole 32h other than the portion into which the suspension bolt 16 is inserted faces the end top wall portion 44 in the first direction X. In a state where the suspension bolt 16 as a bolt body is inserted into the first insertion hole 32h as an insertion hole, the portion of the first insertion hole 32h of the first overlapping region R1 other than the portion into which the suspension bolt 16 is inserted is covered by the proximity region R4 of the second overlapping region R2.

[0096] Of the second insertion hole 42h, the portion that does not face the first insertion hole 32h faces the third intermediate top wall portion 73 forming the proximity region R4 in the first direction X. As a result, the portion of the second insertion hole 42h other than the portion into which the suspension bolt 16 is inserted faces the third intermediate top wall portion 73 in the first direction X. In a state where the suspension bolt 16 as a bolt body is inserted into the second insertion hole 42h as an insertion hole, the portion of the second insertion hole 42h of the second overlapping region R2 other than the portion into which the suspension bolt 16 is inserted is covered by the proximity region R4 of the first overlapping region R1.

[0097] According to the present embodiment, the same operation as in the first embodiment can be obtained. [Effects of the Second Embodiment] According to the above embodiment, in addition to the effects obtained in the first embodiment, the following effects can be obtained.

[0098] (2-1) The first insertion hole 32h as the insertion hole is formed in the proximity region R4 of the first polymerization region R1. The second insertion hole 42h as the communication hole is formed in the proximity region R4 of the second polymerization region R2. In a state where the suspension bolt 16 as the bolt body is inserted into the first insertion hole 32h and the second insertion hole 42h, a portion other than the portion where the suspension bolt 16 is inserted in the first insertion hole 32h of the first polymerization region R1 is covered by the proximity region R4 of the second polymerization region R2. A portion other than the portion where the suspension bolt 16 is inserted in the second insertion hole 42h of the second polymerization region R2 is covered by the proximity region R4 of the first polymerization region R1. Therefore, even without separately using a member for preventing radiation leakage such as the shielding sheet 60, radiation leakage through the first insertion hole 32h and the second insertion hole 42h can be suppressed.

[0099] [Modification example] In addition, each of the above embodiments can be implemented with the following modifications. Each of the above embodiments and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0100] ○ The first polymerization region R1 and the second polymerization region R2 may be located at the center of the shielding material unit 10 in the second direction Y. ○ The member disposed in the communication space S2 is not limited to the cable 14a connected to the electrical equipment 14 installed in the internal space S1. For example, when a sprinkler is arranged in the internal space S1, a pipe for supplying a liquid such as water to the sprinkler may be arranged to pass through the communication space S2. When the cable 14a is not wired in the communication space S2, the cable 14a may be wired on the lower surface 12b of the shielding ceiling 12.

[0101] ○ It is not necessary to dispose a member such as the cable 14a in the communication space S2. In this case, the communication space S2 may function as a discharge passage for discharging the air heated by the heat generated in the electrical equipment 14 to the outside of the internal space S1.

[0102] ○ At least one of the first end portion 43a of the end partition wall 42 and the first end portion 33a of the intermediate partition wall 32 of the intermediate unit body 31 may have a contact surface formed by being bent toward the outside or inside of the unit body 20. By bringing this contact surface into contact with the upper surface 12a of the shielding ceiling 12, the unit body 20 can surround the periphery of the through hole 12h in a state where the partition wall 21 contacts the upper surface 12a of the shielding ceiling 12 with a large contact area.

[0103] ○ At least one of the first end portion 43a of the end partition wall 42 and the first end portion 33a of the intermediate partition wall 32 of the intermediate unit body 31 may be in contact with the upper surface 12a in a state of being bent along the upper surface 12a of the shielding ceiling 12.

[0104] ○ At least one of the first end portion 43a of the end partition wall 42 and the first end portion 33a of the intermediate partition wall 32 of the intermediate unit body 31 may not be in contact with the upper surface 12a of the shielding ceiling 12. ○ The first end portion 43a of the end partition wall 42 in at least one of the two end unit bodies 41 may not be flush with the first end portion 33a of the intermediate partition wall 32 of the intermediate unit body 31. In this case, the positions of the first end portion 43a of the end partition wall 42 and the first end portion 33a of the intermediate partition wall 32 in the first direction X will be different.

[0105] ○ The protective member 21b may cover at least a part of the inner surface 21c of the shielding member 21a. In short, the protective member 21b only needs to cover at least the outer surface 21d of the shielding member 21a.

[0106] ○ The protective member 21b is not limited to being made of iron. The shielding member 21a is not limited to being made of lead. ○ In at least one of the plurality of unit bodies 20, the protective member 21b may be omitted from the partition wall 21.

[0107] ○ The leg portion 51 may not be formed on the protective member 21b. For example, the leg portion 51 may be formed on the shielding member 21a. ○ The leg portion 51 may be omitted from at least one of the intermediate unit body 31 and the two end unit bodies 41.

[0108] ○ In the second embodiment, the entire first overlapping region R1 and the entire second overlapping region R2 may function as the proximity region R4. In this case, for example, there is no difference in the positions in the first direction X over the entire intermediate ceiling portion 34, and the first overlapping region R1 of the intermediate ceiling portion 34 and the second overlapping region R2 of the end ceiling portion 44 are in contact with each other.

[0109] ○ Of the first overlapping region R1 and the second overlapping region R2, the portions functioning as the proximity region R4 may be separated from each other. In short, in the proximity region R4, it is sufficient that the first overlapping region R1 and the second overlapping region R2 are closer to each other than the separation region R3.

[0110] ○ The first insertion hole 32h may not have the first open end 32j. In this case, the entire first insertion hole 32h is formed away from the edge of the intermediate opening end portion 37. The second insertion hole 42h may not have the second open end 42j. In this case, the entire second insertion hole 42h is formed away from the edge of the end opening end portion 47.

[0111] ○ At least one of the first insertion hole 32h and the second insertion hole 42h may have a shape other than a long hole shape extending in the second direction Y. Examples of the shapes of the first insertion hole 32h and the second insertion hole 42h in this case include holes opening in a perfect circular shape.

[0112] ○ The installation position of the shielding sheet 60 may be the same for the overlapping region R located on the first adjacent direction Y1 side of the shielding material unit 10 and the overlapping region R located on the second adjacent direction side. The shielding sheet 60 may be installed only on the overlapping region R located outside the shielding material unit 10 among the overlapping regions R that overlap each other.

[0113] ○ In the first embodiment, the shielding sheet 60 may be omitted from the shielding material unit 10. ○ The first insertion hole 32h and the second insertion hole 42h may be offset from positions facing each other in the orthogonal direction orthogonal to the partition wall 21. The first insertion hole 32h may be formed in a portion of the intermediate unit body 31 other than the first overlapping region R1. The second insertion hole 42h may be formed in a portion of the end unit body 41 other than the second overlapping region R2.

[0114] ○ The second overlapping region R2 may be located in only one of the two end unit bodies 41. In this case, the first overlapping region R1 is located only at one end of the intermediate unit body 31 in the second direction Y.

[0115] ○ The intermediate unit body 31 may be composed of a plurality of divided bodies divided in the second direction Y. ○ The plurality of unit bodies 20 may be composed of one intermediate unit body 31 and one end unit body 41. Alternatively, the plurality of unit bodies 20 may be composed of two end unit bodies 41 that form an overlapping region R in which the ends in the second direction Y as the adjacent direction can overlap inside and outside, and the outside in the second direction Y is blocked by the end partition wall 42.

[0116] ○ The shielding partition body may be a partition wall or a partition floor. [Supplementary Note] Next, the technical ideas that can be grasped from the above embodiments and modification examples are added below.

[0117] ○ The partition wall includes a plurality of standing wall portions standing in a direction away from the shielding partition body between a first end portion located on the shielding partition body side and a second end portion located on the side opposite to the first end portion in a direction away from the shielding partition body, and a top wall portion connecting the second end portions of the plurality of standing wall portions and facing the shielding partition body. The plurality of standing wall portions form an opening that opens toward the shielding partition body by the first end portion. The opening end portion is formed by a part of the circumferential direction surrounding the opening being missing among the plurality of standing wall portions. The shielding material unit according to claim 2 or claim 3, wherein the opening end portion and the opening communicate with each other.

[0118] ○ The support member includes a first support member and a second support member provided at a position different from that of the first support member in a direction away from the shielding partition body. The shielding material unit according to claim 8, wherein the leg portion can change the support member supported by the first support member and the second support member by being displaced in a direction away from the shielding partition body.

[0119] ○ The shielding member is formed by bending a lead plate. The protection member can maintain the shape of the shielding member by being positioned along the shielding member. At least one of the plurality of unit bodies has a leg portion protruding outward from the unit body toward the outside of the internal space. The shielding material unit according to claim 9, wherein the leg portion is formed on the protection member and is supported by a support member that supports the shielding partition body.

Explanation of Signs

[0120] R... polymerization region, R1... first polymerization region, R2... second polymerization region, R3... separation region, R4... proximity region, S1... internal space, S2... communication space, X... first direction, Y... second direction, Z... third direction, 10... shielding material unit, 11... base ceiling, 11a... double ceiling, 12... shielding ceiling, 12h... through hole, 13... support member, 14... electrical equipment, 14a... cable, 16... suspension bolt, 20... unit body, 21... partition wall, 21a... shielding member, 21b... protection member, 21d... outer surface, 22... opening end, 31... intermediate unit body, 32... intermediate partition wall, 32h... first insertion hole, 32j... first open end, 33a, 43a... first end, 37... intermediate opening end, 41... end unit body, 42... end partition wall, 42h... second insertion hole, 42j... second open end, 47... end opening end, 51... leg portion, 60... shielding sheet.

Claims

1. A shielding material unit for preventing leakage of radiation from a through-hole formed in a shielding partition for shielding radiation, wherein the shielding material unit is composed of a plurality of unit bodies that can be adjacent to each other in an adjacent direction, the unit body includes a partition wall that is arranged to surround the periphery of the through-hole and partitions the internal space of the shielding material unit, and an opening end portion located at an end of the unit body in the adjacent direction, the partition wall includes a shielding material for shielding radiation, the opening end portions of two unit bodies adjacent to each other in the adjacent direction form a overlapping region that overlaps with each other in a direction orthogonal to the partition wall, a shielding material unit, characterized in that the relative position in the adjacent direction of the other unit body with respect to one of the two unit bodies forming the overlapping region can be changed.

2. Among the overlapping regions that overlap with each other in the orthogonal direction, if one of the overlapping regions is referred to as a first overlapping region and the other overlapping region is referred to as a second overlapping region, at least a part of the first overlapping region and at least a part of the second overlapping region have a separation region that is separated from each other in the orthogonal direction, The shielding material unit according to claim 1, wherein a communication space for communicating the inside and outside of the internal space is formed between the separation regions.

3. The plurality of unit bodies include two end unit bodies and intermediate unit bodies arranged between the two end unit bodies in the adjacent direction, the first overlapping region is located in the intermediate unit body, The shielding material unit according to claim 2, wherein the second overlapping region is located in at least one of the two end unit bodies.

4. Insertion holes into which bolt bodies can be inserted are formed in the first overlapping region and the second overlapping region, The shielding material unit according to claim 2 or claim 3, wherein the insertion hole formed in the first overlapping region and the insertion hole formed in the second overlapping region face each other in the orthogonal direction.

5. The insertion hole has an open end that opens in the adjacent direction at an edge of the opening end portion, and is in the shape of a long hole that extends in the adjacent direction away from the open end, the bolt body can be inserted into the insertion hole from the open end, The shielding material unit according to claim 4, further comprising a shielding sheet that covers a portion of the insertion hole other than the portion into which the bolt body is inserted and includes a shielding material for shielding radiation in a state where the bolt body is inserted into the insertion hole.

6. At least a part of the first overlapping region and at least a part of the second overlapping region have a proximity region that is closer to each other than the separation region in the orthogonal direction. The insertion hole is formed in the proximity region of the first overlapping region and the second overlapping region. The shielding material unit according to claim 4, wherein, in a state where the bolt body is inserted into the insertion hole, a portion of the insertion hole of the first overlapping region other than the portion into which the bolt body is inserted is covered by the proximity region of the second overlapping region, and a portion of the insertion hole of the second overlapping region other than the portion into which the bolt body is inserted is covered by the proximity region of the first overlapping region.

7. The shielding material unit according to any one of claims 2 to 6, wherein a cable connected to an electrical device installed in the internal space can be wired in the communication space.

8. At least one of the plurality of unit bodies has a leg portion that protrudes outward from the unit body toward the outside of the internal space. The shielding material unit according to any one of claims 1 to 7, wherein the leg portion is supported by a support member that supports the shielding partition body.

9. The shielding material unit according to any one of claims 1 to 8, wherein the partition wall includes a shielding member formed of lead capable of shielding radiation, and a protection member that protects the shielding member by covering at least an outer surface of the shielding member.

10. A first end portion of the partition wall located on the shielding partition body side is flush with each other among the plurality of unit bodies. The shielding material unit according to any one of claims 1 to 9, wherein the plurality of unit bodies can surround the periphery of the through hole by the first end portion.

11. An electrical device is installed in the shielding ceiling in a double ceiling including a base ceiling and a shielding ceiling that is separated downward from the base ceiling and shields radiation. In order to prevent radiation from leaking from a through hole formed in the shielding ceiling for installing the electrical device, the shielding material unit according to claim 7 covers the through hole in the double ceiling. The shielding ceiling is the shielding partition body. The through hole is a long hole extending in the extending direction. The polymerization region in which the communication space is formed is located on one side in the extending direction of the through hole, closer to one side in the extending direction than the center in the extending direction of the through hole. In this polymerization region, the second polymerization region is located outside the shielding material unit relative to the first polymerization region, and the unit body forming the second polymerization region is on one side in the extending direction relative to the unit body forming the first polymerization region. An electrical equipment installation structure characterized by this.

12. An electrical equipment installed on the shielding ceiling in a double ceiling composed of a base ceiling and a shielding ceiling that is separated downward from the base ceiling and shields radiation, A cable connected to the electrical equipment, A suspension bolt suspended from the base ceiling, A shielding material unit that covers the through hole in the double ceiling to prevent radiation from leaking through the through hole formed in the shielding ceiling for installing the electrical equipment, The shielding material unit is the shielding material unit according to claim 7, The shielding ceiling is the shielding section body, Two unit bodies forming the polymerization region are fixed to the suspension bolt, An electrical equipment installation structure characterized in that the cable is drawn out from the inside to the outside of the internal space through the communication space.

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