JP2013007640A - Assembly radioactive ray shield and radioactive ray shielding method by using the same - Google Patents

Abstract

An assembly-type radiation shielding body that can be easily transported and assembled by an operator is provided.
An assembly type radiation shielding body 1 includes a plurality of elements (a plurality of shielding members 2A and 2B, side support frame members 4A and 4B, reinforcement frames 8A and 8B, a bottom support frame member 11, transported by an operator). The upper surface support frame member 12, the front surface support frame member 13, the rear surface support frame members 15 and 17, and the wheel devices 21A and 21B) are assembled by bolts and nuts. A plurality of shielding members 2 which are radiation shielding bodies are disposed between the vertical frame 5A of the side support frame member 4A and the vertical frame 5B of the side support frame member 4B, and these shielding members 2 are arranged in the vertical frames 5A and 5B. Are held by the lower surface support frame member 11, the front surface support frame member 13, and the rear surface support frame members 15 and 17.
[Selection] Figure 1

Description

  The present invention relates to an assembled radiation shielding body and a radiation shielding method using the same, and more particularly to an assembled radiation shielding body suitable for application to a nuclear power plant and a radiation shielding method using the same.

  In nuclear power plants, radiation shields are used to reduce the exposure of workers during plant inspections, preventive maintenance, repairs, and the like. In conventional radiation shields, there are parts having a weight that exceeds the weight that can be handled by an operator. For this reason, when assembling the radiation shielding body, a heavy machine, a machine tool and the like are required.

  An example of an assembly type radiation shielding body is described in Japanese Patent Application Laid-Open No. 61-38598. This assembly type radiation shielding body has a shielding panel having a telescopic guide post disposed on both sides, an upper end frame provided at the upper end of the guide post, and a lower end frame provided at the lower end of the guide post, and a caster. It is attached to the bottom frame.

JP 61-38598 A

  When working at a nuclear power plant, depending on the work content, work will be performed even in an area where a radiation shield is not installed in advance, and a radiation shield with a function to prevent falling can be easily moved in this area. Installation is required.

  In the prior art, an assembly-type radiation shield cannot be assembled without using an electric machine tool. Therefore, when the access route to the above area, transportation method, and machine tools that can be brought in are restricted, assembly-type radiation is not possible. It is very likely that the shield cannot be applied.

  For this reason, an assembly-type radiation shield that can be transported, assembled, installed, and disassembled with the help of an operator alone so that the radiation shield can be installed in that area even in situations where the tools used are limited. A body is required. Furthermore, when external forces act on the assembly-type radiation shielding body due to an earthquake or the like, the assembly-type radiation shielding body itself may fall over, and there is a risk of damaging the surrounding structures such as piping and equipment of the nuclear power plant. . For this reason, an assembly-type radiation shield with a structure that does not easily fall over even when external force is applied is required. Even if it falls, an assembly-type radiation shield with a structure that can protect certain important items in a nuclear power plant is required. Desired.

  An object of the present invention is to provide an assembly-type radiation shielding body that can be easily transported and assembled by an operator, and a radiation shielding method using the same.

A feature of the present invention for achieving the above-described object is that a pair of side support frame members having a vertical frame vertically attached to the horizontal frame, and one side surface of the vertical frame of the side support frame member and the horizontal frame member are inclined to each other. A reinforcing frame removably attached in a state and a plurality of rear support frame members removably attached to one side of each vertical frame of the side support frame members spaced apart from each other A bottom support frame member and a plurality of front support frame members that are removably attached to the other side of each vertical frame opposite to the one side, and a plurality of removably attached to each horizontal frame. The wheel device,
A plurality of front support frame members are disposed directly above the lower support frame members;
A plurality of shielding members are supported by the lower surface support frame member and the horizontal frame member of each side surface support frame member, and are stacked and disposed between the vertical frames of each side surface support frame member. Is located between the plurality of rear support frame members and the plurality of front support frame members.

  A pair of side support frame members having a vertical frame vertically attached to a horizontal frame, an assembly type radiation shield body, a plurality of shield members, a reinforcing frame removably attached to these side support frame members, and a rear support frame Since it is comprised from the element of a member, a lower surface support frame member, a front surface support frame member, and a wheel apparatus, an operator can convey these elements easily by human power. In addition, the reinforcing frame, the rear support frame member, the lower support frame member, the front support frame member, and the wheel device can be attached to and detached from the pair of side support frame members using removable coupling means (for example, bolts and nuts). Because it is attached, the operator can easily assemble the prefabricated radiation shield.

  Preferably, the wheel device includes a wheel, a wheel support portion that is detachably attached to the horizontal frame, and a wheel attached between the first position below the lower surface of the horizontal frame and the second position above the lower surface. It is desirable to have a wheel support shaft attached to the wheel support so as to be movable in the vertical direction so that the wheel can be moved up and down.

  Since the wheel device has a wheel, a wheel support portion that is detachably attached to the horizontal frame, and a wheel support shaft that is attached to the wheel support portion so that the wheel can be moved in the vertical direction, the wheel is attached to the horizontal frame. It is possible to move up and down between a first position below the lower surface and a second position above the lower surface, and the worker can easily move and install the assembly-type radiation shield.

Preferably, the length of each horizontal frame from the mounting position of the vertical frame to the first tip that is one tip is from the mounting position of the vertical frame to the second tip that is the other tip of each horizontal frame. It is longer than the length of
Each reinforcement frame is detachably attached to a portion of each horizontal frame between the attachment position of the vertical frame and the first tip, and each reinforcement frame is attached to the attachment position of the vertical frame of each horizontal frame. It is desirable that it is not attached to a portion between the second tips.

  The length from the vertical frame mounting position to the first tip of each horizontal frame is longer than the length from the vertical frame mounting position to the second tip of each horizontal frame. Even if it acts on the assembly type radiation shielding body in the direction from the laminated shielding member toward the reinforcing frame, the risk of the assembly type radiation shielding body falling is remarkably reduced. For this reason, by placing the portion of the horizontal frame between the mounting position of the vertical frame and the first tip on the side facing the structural member that is the shielding object, the overturning moment acts on the assembly type radiation shielding body. Even in this case, the probability that the assembly type radiation shielding body falls and damages its structural member can be made very small.

  ADVANTAGE OF THE INVENTION According to this invention, conveyance of the element used for an assembly-type radiation shielding body can be easily performed by an operator's human power, and also an assembly-type radiation shielding body can be assembled easily.

It is a perspective view of the assembly-type radiation shielding body which is one preferable Example of this invention. It is a side view of the assembly-type radiation shielding body shown in FIG. It is explanatory drawing which shows the assembly of the assembly-type radiation shielding body shown in FIG. It is explanatory drawing which shows the lamination | stacking state of the plate-shaped shielding member in the assembly-type radiation shielding body shown in FIG. It is a VV arrow line view of FIG. It is an enlarged view of the vicinity of the wheel device of the assembly-type radiation shield shown in FIG. It is a VII-VII arrow line view of FIG.

  Examples of the present invention will be described below.

  An assembly type radiation shielding body which is a preferred embodiment of the present invention will be described with reference to FIGS. 1, 2 and 3.

  The assembly type radiation shielding body 1 of the present embodiment includes a plurality of plate-like shielding members 2, a support frame 3, a reinforcing frame 8B, a front support frame member 13, rear support frame members 15, 17 and wheel devices 21A, 21B. ing.

  The support frame 3 includes side surface support frame members 4A and 4B, a lower surface support frame member 11, and an upper surface support frame member 12. The side support frame member 4A is configured by attaching the vertical frame 5A to the horizontal frame 6A so as to be perpendicular to the horizontal frame 6A extending in the horizontal direction. The vertical frame 5A has a lower end attached to the horizontal frame 6A. The side support frame member 4B is configured by attaching the vertical frame 5B to the horizontal frame 6B so as to be perpendicular to the horizontal frame 6B extending in the horizontal direction. The vertical frame 5B has a lower end attached to the horizontal frame 6B. Both ends of the lower surface support frame member 11 arranged in the direction orthogonal to the direction in which the horizontal frames 6A and 6B extend are secured to the vertical frame 5A of the side support frame member 4A and the vertical frame 5B of the side support frame member 4B by bolts and nuts. It is attached to each lower end part. As a result, the side surface support frame member 4 </ b> A and the side surface support frame member 4 </ b> B arranged in parallel are connected by the lower surface support frame member 11. The upper surface support frame member 12 is attached to the respective upper ends of the vertical frame 5A and the vertical frame 5B.

  As shown in FIG. 3, the lower surface support frame member 11 includes a support frame 11A, a support member 11B, and a shielding support portion 11C. 11 C of shielding support parts are arrange | positioned under 11 A of support frames, and are attached to the support member 11B attached to the lower surface of 11 A of support frames. The shielding support portion 11C is bent by 90 ° with respect to the support frame 11A and is parallel to the horizontal frames 6A and 6B. The lower surface of the shielding support portion 11C is at the same height as the lower surfaces of the horizontal frames 6A and 6B.

  Both ends of the reinforcing frame 8A are attached to the vertical frame 5A and the horizontal frame 6A with bolts and nuts, respectively, while the reinforcing frame 8A is inclined. Both ends of the reinforcing frame 8B are attached to the vertical frame 5B and the horizontal frame 6B with bolts and nuts, respectively, while the reinforcing frame 8B is inclined.

  The front support frame member 13 is a reinforcing frame that is connected between the two element frames 13A at the center in the longitudinal direction by joining both ends of the two long element frames 13A with the two short element frames 13B. Both ends of 14 are attached to these element frames 13A. Two elongate front support frame members 13 having such a configuration are stacked in the vertical direction and face one side surface of each of the vertical frames 5A and 5B on the side opposite to the position where the reinforcement frames 8A and 8B are disposed. Arranged. Each element frame 13B located at one end in the longitudinal direction of each front support frame member 13 is attached to one side surface of the vertical frame 5A with bolts and nuts. Each element frame 13B located at the other end in the longitudinal direction of each front support frame member 13 is attached to one side surface of the vertical frame 5B with bolts and nuts. The two front support frame members 13 are disposed immediately above the support frame 11 </ b> A of the lower support frame member 11.

  The upper surface of the element frame 13A existing above the front support frame member 13 disposed above the two is positioned at the same height as the upper ends of the vertical frames 5A and 5B. The other front support frame member 13 is disposed below the front support frame member 13, and the element frame 13 </ b> A existing above the former front support frame member 13 is present below the latter front support frame member 13. It is in contact with the frame 13A.

  The rear support frame member 15 is a reinforcing frame that is connected between the two element frames 15A at the center in the longitudinal direction by joining both ends of the two long element frames 15A with the two short element frames 15B. The both ends of 16 are attached to these element frames 15A. Two elongate rear support frame members 15 having such a configuration are stacked in the vertical direction and face the other side surfaces of the vertical frames 5A and 5B on the side where the reinforcing frames 8A and 8B are arranged. Be placed. Each element frame 15B located at one end in the longitudinal direction of each rear support frame member 15 is attached to the vertical frame 5A with bolts and nuts. Each element frame 15B located at the other end in the longitudinal direction of each rear support frame member 15 is attached to the vertical frame 5B with bolts and nuts. Of the two, the upper surface of the element frame 15A existing above the rear support frame member 15 disposed above is positioned at the same height as the upper ends of the vertical frames 5A and 5B. The other rear support frame member 15 is arranged below the rear support frame member 15, and the element frame 15 </ b> A existing on the upper part of the former rear support frame member 15 is present on the lower part of the latter rear support frame member 15. It is in contact with the frame 15A. The two rear support frame members 15 are disposed above the attachment position of the reinforcement frame 8A to the vertical frame 5A and the attachment position of the reinforcement frame 8B to the vertical frame 5B, and the vertical frames 5A and 5B are interposed therebetween. The two rear support frame members 13 are opposed to each other.

  The rear support frame member 17 is a reinforcing frame that is connected between the two element frames 17A at the center in the longitudinal direction by joining both ends of the two long element frames 17A with the two short element frames 17B. The both ends of 18 are attached to these element frames 17A. One elongate rear support frame member 17 having such a configuration is arranged facing the respective side surfaces of the vertical frames 5A and 5B on the side where the reinforcing frames 8A and 8B are arranged, and the rear support frame member 15 is arranged. It is arranged just below. Each element frame 17B located at one end in the longitudinal direction of the rear support frame member 17 is attached to the vertical frame 5A with bolts and nuts. An element frame 17B located at the other end in the longitudinal direction of the rear support frame member 17 is attached to the vertical frame 5B with bolts and nuts. The element frame 17A existing below the rear support frame member 17 is disposed above the horizontal frames 6A and 6B and the shielding support portion 11C, and the attachment position of the reinforcement frame 8A to the vertical frame 5A and the vertical frame of the reinforcement frame 8B. It is arrange | positioned below rather than the attachment position to 5B.

  The plurality of shielding members 2 include a plurality of plate-shaped shielding members 2A made of a radiation shielding material (for example, lead) and a plurality of plate-shaped shielding members 2B (see FIG. 4). The shielding member 2A and the shielding member 2B have different lengths, and the shielding member 2A is longer than the shielding member 2B. The shielding members 2A and 2B each have a weight that can be carried by an operator. Each shielding member 2A and each shielding member 2B are arranged between the vertical frame 5A of the side support frame member 4A and the vertical frame 5B of the side support frame member 4B so that one shielding member 2A and one shielding member 2B are aligned. Are stacked from the upper surfaces of the horizontal frames 6A and 6B toward the upper ends of the vertical frames 5A and 5B. Each longitudinal direction of shielding member 2A, 2B has faced the direction of vertical frame 5A, 5B. At the lowest level of the layer of the shielding member 2 stacked, for example, the shielding member 2A is supported by the horizontal frame 6A and the shielding support portion 11C at both ends, and the shielding member 2B is supported by the horizontal frame 6B and the shielding support portion 11C at both ends. It is supported. One end of the shielding member 2A and the shielding member 2B located at the same height are in contact with each other. As shown in FIG. 4, the shielding members 2 </ b> A and the shielding members 2 </ b> B are alternately stacked so that the contact positions of the shielding members 2 </ b> A and 2 </ b> B are shifted in the height direction without being arranged in a straight line.

  As shown in FIG. 5, the shielding members 2 are arranged in two rows before and after. For convenience, in FIG. 5, the horizontal frame 6B is not attached with the reinforcing frame 8B after the side of the horizontal frame 6B where the reinforcing frame 8B is attached, with reference to the stacked layers of the shielding member 2 as a reference. The partial side is referred to as the front. As shown in FIG. 4, both the front row layer and the back row layer of the stacked shielding member 2 are formed by alternately stacking shielding members 2 </ b> A and shielding members 2 </ b> B. However, in the front row layer and the back row layer, the shielding member 2A and the shielding member 2B are arranged in reverse, and the contact positions of the shielding member 2A and the shielding member 2B arranged in a row are shifted in consideration of radiation trimming. Yes. The positions in the height direction of the shielding members 2A and 2B arranged in the front row layer are different from the positions in the height direction of the shielding members 2A and 2B arranged in the rear row layer. That is, each shielding member 2 arranged in the front row layer is arranged so as to block the contact surface in the vertical direction of each shielding member 2 arranged in the rear row layer. By arranging the shielding members 2 in the front row layers and the shielding members 2 in the rear row layers, the radiation traveling in the front-rear direction is prevented from passing between the contact surfaces in the vertical direction of the shielding members 2. can do. In order to realize such an arrangement of the shielding members 2, the height direction of the shielding members 2A and 2B arranged at the lowermost position and the shielding members 2A and 2B arranged at the uppermost position in the rear row layer The thickness at is half the thickness in the height direction of the other shielding members 2A and 2B.

  The shielding members 2 </ b> A and 2 </ b> B existing on the upper layer of the accumulated shielding member 2 are arranged between the front support frame member 13 and the rear support frame member 15. The reinforcing frame 13 of the front supporting frame member 13 and the reinforcing frame 16 of the rear supporting frame member 15 cover the contact surfaces in the longitudinal direction of the shielding members 2A and 2B arranged in the horizontal direction.

  The two thin plates 22 are disposed between the rear support frame member 15 and the shield member 2 positioned below and between the shield member 2 and the rear support frame member 17 disposed in the rear row layer. The lower ends of these thin plates 22 are supported by the horizontal frames 6A and 6B and the shielding member 2. The upper ends of the thin plates 22 are arranged between the element frame 15A existing below the rear support frame member 15 located below and the shielding members 2 arranged in the rear layer. Although not shown in the drawing, the other two thin plates 22 are provided between the front supporting frame member 13 and the shielding member 2 located below and the shielding member 2 and the front supporting frame member 17 disposed in the front row layer. The element frame 13 </ b> A and the supporting frame 11 </ b> A of the lower surface supporting frame member 11 are disposed between the element frame 13 </ b> A and the lower supporting frame member 11. The lower ends of these thin plates 22 are also supported by the horizontal frames 6A and 6B and the shielding member 2.

  The thin plate 22 and the reinforcing frames 14 and 16 prevent the shielding members 2A and 2B from shifting in the longitudinal direction of the horizontal frames 6A and 6B.

  Instead of the thin plate 22, a plurality of front support frame members are continuously provided on one side of each of the vertical frames 5A and 5B from the upper surface of the horizontal frames 6A and 6B to the upper ends of the vertical frames 5A and 5B. The mounting position and reinforcement of the reinforcing frame 8A and the vertical frame 5A are provided on the opposite side surfaces of the vertical frames 5A and 5B from the upper surface of the rear support frame member 17 to the upper ends of the vertical frames 5A and 5B. A plurality of rear support frame members 15 may be attached in succession in consideration of the attachment positions of the frame 8B and the vertical frame 5B.

  Next, the wheel devices 21A and 21B will be described. Since wheel apparatus 21A, 21B has the same structure, the structure of wheel apparatus 21B is demonstrated using FIG.6 and FIG.7. Two wheel devices 21B are attached to the horizontal frame 6B. The wheel device 21B includes a wheel support portion 7B, a wheel 9B, and a wheel support shaft 10B. The wheel support portion 7B is attached to the upper surface of the horizontal frame 6B with bolts and nuts, and protrudes from the horizontal frame 6B toward the horizontal frame 6A. The wheel 9B is rotatably attached to the wheel support shaft 10B, and the wheel support shaft 10B penetrates the wheel support portion 7B in the height direction. The wheel support shaft 10B is formed with a screw at the top, and two nuts 19 and 20 are engaged with the screw (see FIG. 7). The nut 19 is positioned above the steel plate support 23 provided at the upper end of the wheel support 7B, and the nut 20 is positioned below the steel plate support 23. By tightening the nut 19 and the nut 20 so as to sandwich the steel plate support portion 23, the wheel support shaft 10B is fixed to the wheel support portion 7B.

  The wheel device 21A has a wheel support portion 7A, a wheel 9A (not shown), and a wheel support shaft 10A, similarly to the wheel device 21B. Two wheel devices 21A are attached to the horizontal frame 6A in the same manner as the wheel device 21B.

  In each wheel device 21B, by loosening the nut 20 and tightening the nut 19, the wheel support shaft 10B moves upward, and the wheel 9B can be moved upward from the lower surface of the horizontal frame 6B. Also in each wheel device 21A, by loosening the nut 20 (not shown) and tightening the nut 19 (not shown), the wheel support shaft 10A moves upward, and the wheel 9A is moved from the lower surface of the horizontal frame 6A. Can also be moved upward.

  The assembly-type radiation shield 1 lowers the two wheels 9A below the lower surface of the horizontal frame 6A so that these wheels 9A are in contact with the floor surface, and the two wheels 9B are below the lower surface of the horizontal frame 6B. The wheel 9B can be moved on the floor surface by bringing the wheel 9B into contact with the floor surface. The two wheels 9A are lifted upward from the lower surface of the horizontal frame 6A, and further, the two wheels 9B are lifted upward from the lower surface of the horizontal frame 6B, whereby each of the horizontal frames 6A, 6B and the shielding support portion 11C. Can be brought into contact with the floor surface. In this state, the assembly type radiation shielding body 1 is installed on the floor surface.

  The fall prevention measures of the assembly-type radiation shielding body 1 will be described with reference to FIG. The length of the rear portion of the horizontal frame 6B (the portion of the horizontal frame 6B to which the reinforcing frame 8B is attached), which is based on the position of half the thickness in the horizontal direction of the vertical frame 5B, is d1, and the position The length of the front portion of the horizontal frame 6B (the portion of the horizontal frame 6B to which the reinforcing frame 8B is not attached) is d2. Although not shown in FIG. 2, the rear portion of the horizontal frame 6A (the portion of the horizontal frame 6A to which the reinforcing frame 8A is attached) based on the position of half the thickness of the vertical frame 5A in the horizontal direction. The length of is also d1, and the length of the front portion of the horizontal frame 6A (the portion of the horizontal frame 6A to which the reinforcing frame 8A is not attached) based on the position is also d2. The length d1 is longer than the length d2, and the length of the horizontal frames 6A and 6B at the rear portion is longer than the length of the front portion of the horizontal frames 6A and 6B.

  The length d2 is set so that the stable moment M1 around the point A is larger than the overturning moment M2 acting on the center of gravity G when the design acceleration α is applied to the center of gravity G of the layer of the laminated shielding member 2 due to an earthquake or the like. Is set. Here, the stability moment M1 is obtained on the assumption that the length d1 is equal to the length d2. For this reason, even if the length d1 is equal to the length d2, if the horizontal acceleration acting on the layer of the laminated shielding member 2 is equal to or less than the design acceleration α, the assembly type radiation shielding body 1 is Do not fall.

  In this embodiment, since d1> d2, and the reinforcing frame 8A supports the vertical frame 5A and the reinforcing frame 8B supports the vertical frame 5B, the assembly type radiation shielding body 1 is arranged in the b direction. On the other hand, it has a structure that is not easily toppled, and the layer of the shield member 2 that has been stacked is difficult to collapse.

  For this reason, the assembly type radiation shielding body 1 falls by installing the assembly type radiation shielding body 1 on the floor with the reinforcement frames 8A and 8B of the assembly type radiation shielding body 1 facing the important equipment of the nuclear power plant. This can greatly reduce the risk of damage to important equipment. In the state in which the assembly-type radiation shielding body 1 is installed on the floor surface, the wheels 9A and 9B are pulled up above the lower surfaces of the horizontal frames 6A and 6B, and the lower surfaces of the horizontal frames 6A and 6B are Touching the surface.

  In addition, the assembly type radiation shielding body 1 is installed with the distance from the important equipment of the nuclear power plant to the layer of the layered shielding member 2 separated from the height h of the layered layer of the shielding member 2. Therefore, even if the assembly type radiation shielding body 1 falls toward the important equipment, the risk of damage to the important equipment can be further reduced.

  The assembly of the assembly type radiation shielding body 1 of the present embodiment will be described.

  A plurality of workers have a plurality of shielding members 2A and 2B, side support frame members 4A and 4B, reinforcement frames 8A and 8B, a lower support frame member 11, an upper support frame member 12, a front support frame member 13, and a rear support frame member. 15 and 17 and the wheel devices 21A and 21B are shared and shared by a plurality of workers, and the radiation is installed in an area where the assembly type radiation shielding body 1 is installed for the nuclear power plant or near this area. Transport to a low-volume area.

  In that area, the worker performs the assembly work of the assembly-type radiation shielding body 1 described below.

  Two wheel devices 21A are attached to the horizontal frame 6A of the side support frame member 4A with bolts and nuts. Two wheel devices 21B are also attached to the horizontal frame 6B of the side support frame member 4B with bolts and nuts. The wheels 9A and 9B are lifted above the horizontal frames 6A and 6B, and the lower surfaces of the horizontal frames 6A and 6B are brought into contact with the floor surface, so that the side support frame members 4A and 4B stand on the floor surface. The side support frame member 4A and the side support frame member 4B are arranged apart from each other by a predetermined width. In this state, the both ends of the support frame 11A of the lower surface support frame member 11 and the element frames 13B of the two front surface support frame members 13 are respectively attached to the vertical frames 5A and 5B with bolts and nuts at the positions described above. Install. The reinforcing frame 8A is attached to the horizontal frame 6A and the vertical frame 5A with bolts and nuts. The reinforcing frame 8B is attached to the horizontal frame 6B and the vertical frame 5B with bolts and nuts.

  With the two thin plates 22 in contact with the support frame 11A of the lower surface support frame member 11 and the lower element frame 13A of the front surface support frame member 13 disposed on the lower side, the shielding members 2A and 2B are in the state described above. In such a manner, the shielding support portion 11C of the lower surface support frame member 11 and the position of the element frame 13A below the front support frame member 13 disposed on the lower side from the upper surface of each of the shielding support portions 11C of the lower surface support frame member 11 and the horizontal frames 6A and 6B. Laminate. After the lamination of the shielding members 2A and 2B is finished, each element frame 17B of the rear support frame member 17 is bolted in a state in which the other two thin plates 22 are in contact with the respective shielding members 2A and 2B. And attach to the above-mentioned position of the vertical frames 5A and 5B with nuts. Then, the remaining shielding members 2A and 2B are alternately arranged and stacked up to the upper ends of the vertical frames 5A and 5B. Thereafter, the two rear support frame members 15 are attached to the positions described above with bolts and nuts. After the lamination of the shielding members 2A and 2B is completed, the upper surface support frame member 12 is disposed above the shielding members 2A and 2B that are laminated and positioned at the uppermost position, and each of the vertical frames 5A and 5B is secured by bolts and nuts. Attach to the top.

  In each wheel device 21B, the nut 19 is loosened and lifted to a position where the wheel 9B is below the lower surface of the horizontal frame 6B. Then, the nut 20 is rotated and moved toward the steel plate support portion 23. Thereby, the horizontal frame 6B is lifted, and the wheels 9B are positioned below the lower surface of the horizontal frame 6B. The nuts 19 and 20 are firmly tightened to fix the wheel support shaft 10B to the wheel support portion 7B. The same operation is performed in each wheel device 21A, and the wheel 9A is positioned below the lower surface of the horizontal frame 6A. Check that the nuts 19 and 20 are not loosened by vibration.

  Thereafter, when the assembly type radiation shielding body 1 is pushed by an operator, the wheel 9A, 9B is rotated on the floor surface and moved to a predetermined position where radiation shielding is performed in the nuclear power plant. After the assembly-type radiation shielding body 1 has moved to its predetermined position, as described above, the wheel 9A is lifted from the lower surface of the horizontal frame 6A, and the wheel 9B is lifted from the lower surface of the horizontal frame 6B. The assembly type radiation shielding body 1 is installed on the floor surface by bringing the lower surfaces of 6A and 6B into contact with the floor surface.

  If necessary, a plurality of assembly-type radiation shields 1 are arranged side by side so as to face the structural members of the nuclear power plant. At this time, each assembling type radiation shielding body 1 faces the structural member that is the radiation shielding object on the part where the reinforcing frames 8A and 8B of the horizontal frames 6A and 6B are attached (the structural member side). To be oriented). In such a state, necessary work (for example, maintenance inspection work of the nuclear power plant) is performed by the worker. During this operation, the layer of the shielding member 2 stacked on each assembly-type radiation shielding body 1 shields the radiation emitted from the structural member, so that the radiation dose of the worker who is performing the operation is reduced. After the operation is completed, the operator loosens the bolts and nuts and disassembles the assembling-type radiation shielding body 1 in a procedure reverse to the assembling procedure. After disassembly, each disassembled part of the assembly-type radiation shield 1 is carried out by an operator.

  According to the present embodiment, the assembly-type radiation shielding body 1 includes a plurality of elements (for example, a plurality of shielding members 2A and 2B, side support frame members 4A and 4B, a reinforcing frame 8A) constituting the assembly-type radiation shielding body 1. , 8B, lower surface support frame member 11, upper surface support frame member 12, front surface support frame member 13, rear surface support frame members 15, 17 and wheel devices 21A, 21B). can do. Even when the assembly type radiation shielding body 1 assembled with a narrow conveyance path cannot be conveyed, these elements can convey the narrow conveyance path. A transport device such as a heavy machine is not necessary for transporting these elements.

  Moreover, when assembling the assembly-type radiation shielding body 1 using these elements after conveyance, an operator can assemble using bolts and nuts. For this reason, a welding apparatus and an electric tool become unnecessary and it becomes unnecessary to convey these. After the work with the assembled radiation shielding body 1 installed (for example, the maintenance and inspection work for the structural members of the nuclear power plant) is completed, the worker can easily disassemble the assembled radiation shielding body 1 into the above-described elements. After disassembly, the worker can easily carry the assembled radiation shielding body 1 as each element.

  Since the assembly type radiation shielding body 1 includes the wheel devices 21A and 21B that can raise and lower the wheels 9A and 9B, the assembly type radiation shielding body 1 can be easily moved and installed by an operator.

  In this embodiment, the length of the rear portion of the horizontal frame (6A, 6B) (the portion of the horizontal frame (6A, 6B) to which the reinforcing frame (8A, 8B) is attached) is the horizontal frame (6A, 6B). Is longer than the length of the front portion (the portion of the horizontal frame (6A, 6B) where the reinforcing frame (8A, 8B) is not attached), so that the shielding member 2 in which the overturning moment is stacked due to an earthquake or the like Even if it acts on the assembly-type radiation shielding body 1 in the direction from the reinforcing frame (8A, 8B) to the reinforcement frame (8A, 8B), the risk of the assembly-type radiation shielding body 1 falling is significantly reduced. For this reason, by arranging the part of the horizontal frame (6A, 6B) to which the reinforcing frame (8A, 8B) is attached on the side facing the structural member of the nuclear power plant, an assembly-type radiation shielding body due to an earthquake or the like Even if the overturning moment M2 acts on 1, the probability that the assembling-type radiation shielding body 1 falls over and damages its structural members can be made very small.

  DESCRIPTION OF SYMBOLS 1 ... Assembling-type radiation shielding body, 2, 2A, 2B ... Shielding member, 3 ... Support frame, 4A, 4B ... Side support frame member, 5A, 5B ... Vertical frame, 6A, 6B ... Horizontal frame, 7A, 7B ... Wheel Support part, 8A, 8B ... Reinforcement frame, 9B ... Wheel, 10A, 10B ... Wheel support shaft, 11 ... Bottom support frame member, 11C ... Shield support part, 12 ... Top support frame member, 13 ... Front support frame member, 15 , 17 ... rear support frame member, 21A, 21B ... wheel device.

Claims (5)

A pair of side support frame members each having a vertical frame vertically attached to a horizontal frame, and one side surface of each of the side support frame members and one side surface of the vertical frame and the horizontal frame member are detachably attached in an inclined state. A reinforcing frame; a plurality of rear support frame members removably attached to the one side of each of the vertical frames of the side support frame members spaced apart from each other; and A lower support frame member and a plurality of front support frame members removably attached to the other side opposite to the one side; and a plurality of wheel devices removably attached to the respective horizontal frames. ,
The plurality of front support frame members are disposed directly above the lower support frame member;
A plurality of shielding members are supported and stacked between the lower surface support frame member and the horizontal frame member of each of the side surface support frame members, and are disposed between the vertical frames of each of the side surface support frame members. An assembled radiation shielding body, wherein the plurality of shielding members arranged are disposed between the plurality of rear support frame members and the plurality of front support frame members.   The plurality of shielding members include a plurality of first shielding members and a plurality of second shielding members that are longer than the first shielding members, and the first shielding members and the second shielding members include the side support frames. 2. The device according to claim 1, wherein the first shielding members and the second shielding members are alternately stacked, wherein the first shielding members and the second shielding members are arranged in a straight line between the vertical frames of the members so that the longitudinal directions thereof coincide with each other. Assembled radiation shield.   The wheel device includes a wheel, a wheel support portion that is detachably attached to the horizontal frame, and a first position that is lower than the lower surface of the horizontal frame and a second position that is higher than the lower surface. The assembly-type radiation shielding body according to claim 1, further comprising a wheel support shaft attached to the wheel support portion so as to be movable in a vertical direction so that the wheel can move up and down. The length of each horizontal frame from the mounting position of the vertical frame to the first tip that is one tip is the second tip that is the other tip of the horizontal frame from the mounting position of the vertical frame. It is longer than the length until
Each reinforcing frame is detachably attached to a portion of the respective horizontal frame between the mounting position of the vertical frame and the first tip, and each reinforcing frame is attached to the respective horizontal frame, The assembly-type radiation shield according to any one of claims 1 to 3, wherein the assembly-type radiation shield is not attached to a portion between an attachment position of the vertical frame and the second tip. A radiation shielding method using the assembly-type radiation shielding body according to claim 4,
A portion of the horizontal frame between the mounting position of the vertical frame and the first tip is disposed on the side facing the structural member that is an object to be shielded, and radiation emitted from the structural member is caused by the shielding member. A radiation shielding method using an assembly-type radiation shielding body characterized by shielding.

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