JP6085214B2 - Movable shielding block and laminated structure of movable shielding block - Google Patents

Description

  The present invention relates to a measure for reducing the radiation dose to a high-dose site in a facility that handles radioactive substances (for example, a nuclear power plant, a nuclear fuel reprocessing facility, a medical radiation utilization facility, a research facility using an accelerator, etc.).

  In facilities that handle radioactive materials (for example, nuclear power plants, nuclear fuel reprocessing facilities, medical radiation utilization facilities, research facilities using accelerators, etc.), workers may have to work under high doses. Therefore, it is necessary to take measures to reduce the exposure dose of workers in facilities that handle radioactive materials. As a measure for reducing the exposure dose of the worker, a shielding member is installed around the work space (particularly, a radiation source with a high dose) to shield radiation.

  For example, as this type of technology, there is a technology for shielding radiation by constructing a temporary frame around a work space where radiation should be shielded and attaching a shielding member such as a lead plate mat or a lead hair mat to the temporary frame. Yes (see, for example, Patent Document 1).

  In addition, for example, as a technique of this kind, radiation is shielded by building a radiation shielding wall by stacking rectangular or fishing concrete blocks as shielding members around a work space where radiation should be shielded. There is a technique (for example, refer to Patent Document 2).

Japanese Patent Laid-Open No. 2002-257983 JP 2007-46996 A

  However, the prior art described in Patent Document 1 and Patent Document 2 imposes a heavy burden on the worker as described below, and it is impossible to transport and install the shielding member in a short time. There was a problem.

  The prior art described in Patent Document 1 conveys various materials (for example, support members and joint members constituting a temporary frame, shielding members such as lead plate mats and lead hair mats) to the work site, and at the work site. It is necessary to construct a temporary frame and to attach a shielding member such as a lead plate mat or a lead hair mat to the temporary frame.

  Various materials (in particular, shielding members such as lead plate mats and lead hair mats) are relatively heavy for workers. Therefore, these materials are difficult to transport. In addition, there are a plurality of types of materials. For this reason, the worker transports the material to the vicinity of the work site, temporarily accumulates it for each type, and takes out a desired type of material such as a column member or a joint member from the temporarily accumulated material to construct a temporary frame. There is a need. The shielding member is attached to the temporary frame by passing a hook provided in the temporary frame through a hole provided in the shielding member and suspending the shielding member on the temporary frame. Therefore, the worker needs to lift the heavy shielding member and pass the hook of the temporary frame through the hole of the shielding member while supporting the shielding member.

  Therefore, the prior art described in Patent Document 1 is accompanied by a great deal of labor (for example, labor for transporting materials to the vicinity of the work site and temporarily accumulating each type, temporarily accumulated at the work site. The work to take out the desired types of materials such as support members and joint members from the collected materials and to construct the temporary frame, and lift the heavy shielding member to support the shielding member, For example, labor required to pass the hook through the hole of the shielding member).

  In addition, the conventional technique described in Patent Document 1 requires a great deal of time for these operations. For this reason, the conventional technique described in Patent Document 1 cannot transport and install the shielding member in a short time. As a result, according to the conventional technique described in Patent Document 1, the exposure amount of the worker is not measured until the installation of the shielding member (attachment of the shielding member to the temporary frame) is completed after the conveyance of the material is started. It was easy to increase.

  Moreover, the prior art described in patent document 2 needs to convey the concrete block as a shielding member to a work site, and pile up the concrete block at a work site, and to construct a radiation shielding wall.

  Workers need to wear radiation protective clothing when the dose at the work site is relatively high. And, when carrying the concrete block by hand to the work site, the worker must carefully carry the concrete block while taking care and checking the feet so that the radiation protection suit does not hit the concrete block and get damaged. is there. Moreover, the concrete block is relatively heavy for the worker. Therefore, in addition to physical burden, the worker is also forced to bear a mental burden. As a result, the worker cannot carry the concrete block for a long time. Moreover, since the walking speed (conveying speed of a concrete block) becomes slow, an operator cannot convey a concrete block too far. Thus, since the concrete block of the prior art described in Patent Document 2 imposes physical and mental burdens on workers, it is not suitable for long-time conveyance and long-distance conveyance, and is difficult to convey.

  Therefore, the prior art described in Patent Document 2 has forced workers to take a great deal of physical and mental labor to carefully carry concrete blocks by hand to the work site.

  Moreover, the prior art described in Patent Document 2 requires a great deal of time for this work. For this reason, the conventional technique described in Patent Document 2 cannot transport and install the shielding member in a short time. As a result, the prior art described in Patent Document 2 is that the exposure of the worker between the start of conveyance of the shielding member (concrete block) and the completion of installation of the shielding member (construction of the radiation shielding wall). The amount was easy to increase.

The present invention has been made to solve the above-described problems, and is capable of reducing the load on an operator and transporting and installing a shielding member in a short time, and a movable shielding block. providing a laminated structure of the shield blocks the primary purpose.

In order to achieve the above object, the first invention is provided with a block main body having a radiation shielding function for shielding radiation and capable of stacking a plurality of layers vertically, and provided on the bottom surface of the block main body. have a one to a plurality of wheels to move the hole in which the wheels of the other movable shielding blocks stacked on top is fitted is a configuration that is provided on the upper surface of the block body.

  This movable shielding block has a radiation shielding function and functions as a radiation shielding member. And this movable shielding block has the wheel rotatably supported by the bottom face. Therefore, the worker can easily transport this movable shielding block to the work site simply by rotating the wheel.

  Further, unlike the prior art concrete block described in Patent Document 2, the movable shielding block does not require an operator to carry it to the work site by hand. Therefore, the operator does not need to carefully carry the block while taking care and checking the feet so that the radiation protection suit is not damaged. Therefore, this movable shielding block can reduce the physical and mental burden on the worker compared to the concrete block of the prior art described in Patent Document 2, and as a result, it can be transported for a long time and long distance. Can be carried.

  As a result, the movable shielding block can reduce the load on the worker and can transport and install the shielding member in a short time.

  Further, the second invention is a laminated structure of movable shielding blocks, wherein a plurality of movable shielding blocks according to the first invention are vertically moved with their positions shifted in the longitudinal direction in each vertical row. It is set as the structure laminated | stacked by the direction.

  Since the movable shielding block laminated structure uses the movable shielding block according to the first aspect of the invention, it is possible to reduce the load on the worker and to transport and install the shielding member in a short time.

Further, the third invention (reference example) is a flooring material, is formed in a plate shape that can be laid on the floor surface, and the hole into which the wheel of the movable shielding block according to the first invention is fitted, The structure is provided on the upper surface.

The floor material of this reference example can be laid under the movable shielding block according to the first invention to fix the movable shielding block. Since this flooring uses the movable shielding block according to the first aspect of the invention, it is possible to reduce the load on the worker and to transport and install the shielding member in a short time.
Other means will be described later.

  According to the present invention, it is possible to reduce the load on the worker and to transport and install the shielding member in a short time.

It is a figure which shows the structure of the movable shielding block which concerns on Embodiment 1. FIG. It is a figure which shows the structure around the wheel of the movable shielding block which concerns on Embodiment 1. FIG. It is a figure which shows the example of arrangement | positioning of the principal part of the movable shielding block which concerns on Embodiment 1. FIG. It is a figure which shows the example of installation of the movable shielding block which concerns on Embodiment 1. FIG. It is a figure which shows the structure of the movable shielding block which concerns on the modification of Embodiment 1. FIG. It is a figure which shows the structure of the movable shielding block which concerns on Embodiment 2. FIG. It is a figure which shows the example of arrangement | positioning of the principal part of the movable shielding block which concerns on Embodiment 2. FIG. It is a figure which shows the example of installation of the movable shielding block which concerns on Embodiment 2. FIG. It is a figure which shows the structure of the movable shielding block which concerns on the modification of Embodiment 2. FIG. It is a figure which shows the example of installation of the movable shielding block which concerns on the modification of Embodiment 2. FIG. It is a figure which shows the example of arrangement | positioning of the principal part of the movable shielding block which concerns on Embodiment 3. FIG. It is a figure which shows the example of installation of the movable shielding block which concerns on Embodiment 3. FIG. It is a figure which shows the example of installation of a movable shielding block at the time of using the flooring which concerns on Embodiment 4 (reference example) .

  Hereinafter, an embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described in detail with reference to the drawings. Each figure is only schematically shown so that the present invention can be fully understood. Therefore, the present invention is not limited to the illustrated example. Moreover, in each figure, the same code | symbol is attached | subjected about the common component and the same component, and those overlapping description is abbreviate | omitted.

[Embodiment 1]
<Configuration of movable shielding block>
Hereinafter, with reference to FIGS. 1-4, it demonstrates per structure of the movable shielding block which concerns on this Embodiment 1. FIG. FIG. 1 is a diagram illustrating a configuration of a movable shielding block according to the first embodiment. FIG. 2 is a diagram illustrating a configuration around a wheel of the movable shielding block according to the first embodiment. FIG. 3 is a diagram illustrating an arrangement example of main parts of the movable shielding block according to the first embodiment. FIG. 4 is a diagram illustrating an installation example of the movable shielding block according to the first embodiment.

  In addition, the prior art described in Patent Document 1 has a configuration in which a temporary frame is constructed by fixing a column member with a joint member, and a shielding member such as a lead plate mat or a lead hair mat is hung on the temporary frame. . Therefore, the prior art described in Patent Document 1 cannot improve the strength so much and is disadvantageous in earthquake resistance.

  Moreover, the prior art described in patent document 2 is a structure which piles up a concrete block and builds a radiation shielding wall. However, concrete blocks tend to be unstable when they are simply stacked. Therefore, the prior art described in Patent Document 2 is disadvantageous in earthquake resistance. As a result, according to the conventional technique described in Patent Document 2, there is a possibility that the concrete block arranged above will be displaced and the shielding wall will collapse when an earthquake occurs. Therefore, it is necessary for the prior art described in Patent Document 2 to take separate fixing measures so that the concrete blocks are firmly fixed to each other.

  In consideration of this point, the movable shielding block 1 according to the first embodiment is also intended to improve the earthquake resistance as compared with the conventional technique described in Patent Document 1 and the conventional technique described in Patent Document 2. It has a configuration.

  A movable shielding block (hereinafter, simply referred to as “block”) 1 according to the first embodiment is configured as a block material in which a plurality of layers can be stacked one above the other (see FIG. 4).

  Hereinafter, when distinguishing the block 1 disposed below from the block 1 disposed above, the block 1 disposed below is referred to as a “block 1L (not shown)”, and the block disposed above. 1 is referred to as “block 1U (see FIG. 4)”. Here, as shown in FIG. 4, it is assumed that the upper block 1U is stacked and arranged by being shifted in the longitudinal direction by 1/2 with respect to the lower block 1L.

  FIG. 4 shows a state in which two blocks 1 are installed on the floor surface 20 and one block 1 is integrated and arranged on them. Hereinafter, the block 1 installed on the floor 20 may be referred to as “block 1G”.

As for the block 1, the block main body 2 is comprised by the shape of a rectangular parallelepiped.
The block 1 has a radiation shielding function for shielding radiation by being configured as follows.

For example, the block 1 is made of a substance having a radiation shielding function such as concrete, metal having a higher specific gravity than lead, lead, or lead (for example, concrete, lead, or lead). Is also composed of a metal having a large specific gravity.
Or, for example, the block 1 is made of a plate material made of a substance having a radiation shielding function such as lead or a metal having a specific gravity greater than that of lead, in which the main part of the block body 2 is made of concrete, plastic, or the like. It may be configured to be joined to the side surface of the block body 2 or to be incorporated into the block body 2 so as to cover the side surface of the block body 2. Here, the “side surface of the block main body 2” means a main plane constituting the shielding wall when the blocks 1 are arranged in an up-down direction as shown in FIG. 4B.

  The weight of one block 1 may be a weight that can provide a sufficient radiation shielding function and can be easily held by one or two people. Here, the case where the weight of one block 1 is about 30 kg to 60 kg will be described.

  As shown in FIG. 1, the block 1 has one or more wheels 3 rotatably supported on the bottom surface of the block body 2. Further, the block 1 is provided with holes 4 in the upper surface of the block main body 2 in which the wheels 3 of the block 1 (ie, the upper block 1U (see FIG. 4)) stacked and arranged are fitted. Here, description will be made assuming that four wheels 3 are provided on the bottom surface of the block body 2 and four holes 4 are provided on the top surface of the block body 2.

  In the block 1, a space (hereinafter referred to as “accommodating portion”) 5 for accommodating the wheels 3 is provided inside the block main body 2. The accommodating portion 5 is formed inside the block body 2 as a rectangular parallelepiped space, and is open to the bottom surface of the block body 2.

  A support mechanism 6 that supports the wheel 3 so as to be slidable in the vertical direction in a rotatable state is provided inside the housing portion 5. FIG. 2 shows a configuration example of the support mechanism 6. In the example shown in FIG. 2, the support mechanism 6 includes an axle 7 as a support member of the wheel 3 and a damper 8 as an urging member of the wheel 3.

  The damper 8 is a device that uses a fluid such as air or oil, or an elastic body such as a spring or rubber, to weaken the impact or stop the transmission of vibration. Here, description will be made assuming that the block 1 has one damper 8 for each wheel 3.

  The support mechanism 6 supports the wheel 3 while being rotatable by the axle 7, and pushes the wheel 3 accommodated in the accommodating portion 5 by the damper 8 below the bottom surface of the block body 2. Further, the support mechanism 6 has a structure in which the damper 8 is compressed and the wheel 3 sinks when a load is applied to the block 1 (ie, the upper block 1U (see FIG. 4)) stacked on the top. (That is, the structure in which the wheel 3 is accommodated inside the accommodating portion 5). The support mechanism 6 may use a spring as an urging member instead of the damper 8.

  FIG. 3 shows an arrangement example of the main part of the block 1. 3A shows an arrangement example of the wheels 3 provided on the bottom surface side of the block main body 2, and FIG. 3B shows an arrangement example of the holes 4 provided on the upper surface side of the block main body 2. Show. In the example shown in FIG. 3, as described above, the four wheels 3 are provided on the bottom surface of the block body 2, and the four holes 4 are provided on the top surface of the block body 2.

  In FIG. 3, a line CL <b> 1 indicates a center line in the short direction of the block 1. A line CL2 indicates the center line of the block 1 in the longitudinal direction. A point C3 indicates the center point of the wheel 3. A point C4 indicates the center point of the hole 4.

  In the example shown in FIG. 3A, the dimensions of the four wheels 3 are W1 in width and L1 in diameter. In the example shown in FIG. 3B, the dimensions of the four holes 4 are W2 in the horizontal width and L2 in the vertical width, respectively. The lateral width W2 of the hole 4 is set to a value slightly larger than the lateral width W1 of the wheel 3 by the amount of the axle 7 and the damper 8 because the hole 4 needs to accommodate the axle 7 and the damper 8 of the wheel 3. . Further, the vertical width L2 of the hole 4 is set to a value that is the same as or slightly larger than the diameter L1 of the wheel 3 so that the wheel 3 hardly moves inside the hole 4. The depth of the hole 4 is set to a value slightly larger than the amount of protrusion of the wheel 3 from the bottom surface of the block body 2.

  In the example shown in FIG. 3 (a), four wheels 3 have an upper left area, an upper right area, a lower left area, and a lower right area on the bottom surface of the block body 2 defined by the center lines CL1 and CL2. Further, one each is arranged at an equal distance from the center lines CL1 and CL2.

  Specifically, the wheel 3 in the upper left region has a center point C3 at a distance T1 in the left direction from the center line CL1 and a position at a distance P1 in the upward direction from the center line CL2. Has been placed. Further, the wheel 3 in the upper right region is arranged such that the center point C3 is located at a distance T1 in the right direction from the center line CL1 and at a distance P1 in the upward direction from the center line CL2. Yes. Further, the wheel 3 in the lower left region is arranged such that the center point C3 is located at a distance T1 in the left direction from the center line CL1 and at a distance P1 in the lower direction from the center line CL2. Yes. Further, the wheel 3 in the lower right region is arranged so that the center point C3 is located at a distance T1 in the right direction from the center line CL1 and at a distance P1 in the lower direction from the center line CL2. ing.

  In the example shown in FIG. 3A, the “position at a distance P1 upward from the center line CL2” is a position at a distance P2 from the front surface of the block body 2 (the upper surface in FIG. 3A). It has become. Further, “a position at a distance P1 downward from the center line CL2” is a position at a distance P2 from the rear surface of the block body 2 (the lower surface in FIG. 3A).

  In the example shown in FIG. 3B, the four holes 4 are the upper left area, the upper right area, the lower left area, and the lower right area on the upper surface of the block body 2 defined by the center lines CL1 and CL2. In each of the regions, one block is arranged at a position facing the wheel 3 of the block 1 that is stacked and arranged on the upper side (that is, the upper block 1U (see FIG. 4)).

  Here, in the block 1, as shown in FIG. 4B, the upper block 1U (see FIG. 4)) is shifted in the longitudinal direction by 1/2 with respect to the lower block 1L (not shown). It is configured to be integrated and arranged. Therefore, specifically, the hole 4 in the upper left region has a center point C4 located at a distance T1 in the left direction from the center line CL1 and a position at a distance P2 in the upward direction from the center line CL2. Is arranged. Further, the hole 4 in the upper right region is arranged so that the center point C4 is located at a distance T1 in the right direction from the center line CL1 and at a distance P2 in the upward direction from the center line CL2. Yes. Further, the hole 4 in the lower left region is arranged such that its center point C4 is at a position of a distance T1 in the left direction from the center line CL1 and at a position of a distance P2 in the lower direction from the center line CL2. Yes. Further, the hole 4 in the lower right region is arranged so that the center point C4 is located at a distance T1 in the right direction from the center line CL1 and at a distance P2 in the lower direction from the center line CL2. ing.

  Values such as the lateral width W1 and diameter L1 of the wheel 3, the lateral width W2 and longitudinal width L2, the distance T1, the distance P1, and the distance P2 of the hole 4 can be appropriately changed according to the operation. For example, in the block 1, if the values of the distance P 1 and the distance P 2 are both ¼ of the vertical width (longitudinal width) of the block body 2, the arrangement position of the wheel 3 on the bottom surface of the block body 2 and the block The arrangement position of the holes 4 on the upper surface of the main body 2 can be configured to coincide with the vertical direction.

  FIG. 4 shows an installation example of the block 1. FIG. 4A shows a state immediately before two blocks 1 are installed on the floor surface 20 as blocks 1G, and one block 1 is integrated and arranged on the two blocks 1G as blocks 1U. Indicates the state. FIG. 4B shows a state after one block 1U is integrated and arranged on two blocks 1G.

  In the example shown in FIG. 4A, the block 1U is not integrated and arranged on the two blocks 1G. Therefore, the two blocks 1 </ b> G are in a state in which the damper 8 (see FIG. 2) pushes the wheel 3 downward from the bottom surface of the block body 2.

  On the other hand, in the example shown in FIG. 4B, the block 1U is integrated and arranged on the two blocks 1G. Therefore, in the two blocks 1G, the damper 8 (see FIG. 2) is compressed, the wheel 3 is accommodated in the accommodating portion 5, and as a result, the bottom surface of the block body 2 is in contact with the floor surface 20. It has become.

  Such an operation of the block 1 is realized, for example, by setting the pressure value of the damper 8 as follows. That is, the value of the pressure with which one damper 8 pushes one wheel 3 downward is larger than (the load of one block 1 / the number of wheels 3), and (the value of one block 1) It may be set to less than (load × 1.5 / number of wheels 3).

  As shown in FIG. 4 (b), the block 1 is installed on the floor surface 20 as the block 1G (that is, when the wheel 3 is in contact with the floor surface 20), and the other When one block 1 is stacked on the block 1U, the load applied to the wheel 3 in contact with the floor 20 is about half the weight of the block 1G and the block 1U above it. And the total load.

  Here, in the block 1G, when the value of the pressure of the damper 8 is set to the above-described value, the load applied to the wheel 3 in contact with the floor surface 20 becomes larger than the pressure of the damper 8. Therefore, in the block 1G, the damper 8 (see FIG. 2) is compressed, the wheel 3 is accommodated in the accommodating portion 5, and as a result, the bottom surface of the block body 2 is in contact with the floor surface 20. As a result, the block 1G is in a stable state.

  FIG. 4 shows an example in which a block 1 having a vertical width of (2 × (P1 + P2)) is installed. However, when the block 1 is installed near the end, the block 1 whose vertical width is (P1 + P2) (that is, a block whose vertical width is 1/2 the size of the block 1 shown in FIG. 4). ) Will be installed.

  In such a configuration, the block 1 according to the first embodiment can be easily transported to the work site simply by rotating the wheel 3. Further, unlike the prior art concrete block described in Patent Document 2, the block 1 does not require an operator to carry it to the work site by hand.

  Therefore, it is not necessary for the worker to carefully carry the block 1 while paying attention to the radiation protection suit while observing the feet. Therefore, the block 1 can reduce the physical and mental burden of the worker compared to the concrete block of the prior art described in Patent Document 2, and as a result, it can transport for a long time and a long distance. It can be carried out.

  Thereby, the block 1 can improve the workability of a shielding member, Furthermore, since work time can be shortened with the improvement of workability, the exposure amount of a worker can be reduced.

  Further, when the blocks 1 are stacked in the vertical direction, the bottom surface of the block main body 2 of the block 1G disposed on the floor surface 20 comes into contact with the floor surface 20, so that the block 1 is in a stable state. Accordingly, the block 1 can be prevented from moving by vibration when an earthquake occurs, and high earthquake resistance can be obtained.

In addition, the conventional technique described in Patent Document 1 and the conventional technique described in Patent Document 2 are disadvantageous in earthquake resistance as described above.
On the other hand, the block 1 according to the first embodiment is configured such that the wheel 3 and the hole 4 are firmly connected to each other by fitting the wheel 3 of the upper block 1U into the hole 4 of the lower block 1L. It can function as a fixing means for fixing. Therefore, the block 1 can improve the fixing strength between the blocks 1, and also in this respect, the earthquake resistance is improved as compared with the conventional technique described in Patent Document 1 and the conventional technique described in Patent Document 2. be able to. As a result, the block 1 can prevent the upper block 1U from being displaced and the shielding wall from collapsing when an earthquake occurs.

<Configuration of movable shielding block according to modification>
In the block 1 according to the first embodiment, the number and arrangement positions of the wheels 3 and the holes 4 can be changed as appropriate. FIG. 5 shows a configuration of a block 1A according to a modification of the first embodiment. In the example shown in FIG. 5, the block 1A has six wheels 3 and four holes.

  As described above, according to the blocks 1 and 1A according to the first embodiment, the load on the worker can be reduced and the shielding member can be transported and installed in a short time.

[Embodiment 2]
In the block 1 (see FIG. 1) according to the first embodiment, four holes 4 and four accommodating portions 5 are provided inside the block main body 2. The block 1 </ b> A (see FIG. 5) according to the modification of the first embodiment includes six holes 4 and six accommodating portions 5 (not shown) provided inside the block body 2. Therefore, in the blocks 1 and 1A, the number of the holes 4 and the accommodating portions 5 is less than the configuration in which the holes 4 and the accommodating portions 5 are not provided. As a result, in the blocks 1 and 1A, the shielding defect increases and the radiation shielding function decreases.

  Therefore, in the second embodiment, a block 1B is provided in which the area that can be regarded as a shield is increased as compared with the blocks 1 and 1A, and the radiation shielding function is improved.

  Hereinafter, the configuration of the block 1B according to the second embodiment will be described with reference to FIGS. FIG. 6 is a diagram showing the configuration of the block 1B. FIG. 7 is a diagram illustrating an arrangement example of main parts of the block 1B according to the second embodiment. FIG. 8 is a diagram illustrating an installation example of the block 1B according to the second embodiment.

  As shown in FIG. 6, the block 1 </ b> B has three wheels 3 provided on the bottom surface of the block body 2. Therefore, the block 1 </ b> B has three housing portions 5 (see FIG. 1) provided inside the block body 2. Further, the block 1 </ b> B is provided with three holes 4 inside the block body 2. Such a block 1B has fewer holes 4 and accommodating portions 5 than the block 1 according to the first embodiment and the block 1A according to the modification of the first embodiment. Therefore, the block 1B has a larger area that can be regarded as a shield than the blocks 1 and 1A. As a result, the block 1B can reduce the shielding defect and improve the radiation shielding function than the blocks 1 and 1A.

  However, the block 1 according to the first embodiment has four wheels 3. The block 1A according to the modification of the first embodiment has six wheels 3. Therefore, the blocks 1 and 1A can travel more stably than the block 1B having only three wheels 3.

  FIG. 7 shows an arrangement example of the main part of the block 1B. FIG. 7A shows an arrangement example of the wheels 3 provided on the bottom surface side of the block main body 2, and FIG. 7B shows an arrangement example of the holes 4 provided on the upper surface side of the block main body 2. Show. In the example shown in FIG. 7, as described above, the three wheels 3 are provided on the bottom surface of the block body 2, and the three holes 4 are provided on the top surface of the block body 2.

  In the example shown in FIG. 7A, the three wheels 3 are located on the bottom surface of the block body 2 at the center in the horizontal width direction of the block body 2 and above the center in the vertical width direction (hereinafter referred to as “center upper stage”). 1) in the lower left area and the lower right area.

  Specifically, the wheel 3 in the upper center region is disposed such that the center point C3 is positioned on the center line CL1 and at a distance P1 upward from the center line CL2. Further, the wheel 3 in the lower left region is arranged such that the center point C3 is located at a distance T1 in the left direction from the center line CL1 and at a distance P1 in the lower direction from the center line CL2. Yes. Further, the wheel 3 in the lower right region is arranged so that the center point C3 is located at a distance T1 in the right direction from the center line CL1 and at a distance P1 in the lower direction from the center line CL2. ing.

  In the example shown in FIG. 7B, three holes 4 are arranged in the upper center region, the lower left region, and the lower right region, respectively, on the upper surface of the block body 2. Yes.

  Specifically, the hole 4 in the upper center region is arranged so that the center point C4 is located on the center line CL1 and at a distance P2 upward from the center line CL2. Further, the hole 4 in the lower left region is arranged such that its center point C4 is at a position of a distance T1 in the left direction from the center line CL1 and at a position of a distance P2 in the lower direction from the center line CL2. Yes. Further, the hole 4 in the lower right region is arranged so that the center point C4 is located at a distance T1 in the right direction from the center line CL1 and at a distance P2 in the lower direction from the center line CL2. ing.

  FIG. 8 shows an installation example of the block 1B. FIG. 8A shows a state immediately before two blocks 1B are installed on the floor surface 20 as blocks 1G and one block 1B is integrated and arranged on the two blocks 1G as blocks 1U. Indicates the state. FIG. 8B shows a state after one block 1U is integrated and arranged on two blocks 1G.

  As shown in FIG. 8, in the block 1B, the lower block 1B (block 1G in the illustrated example) and the upper block 1B (block 1U) are arranged in opposite directions. That is, in the block 1B, the odd-numbered block 1B in the vertical direction and the block 1B in the even-numbered column in the vertical direction are arranged in opposite directions. Thereby, the block 1B can fit the wheel 3 of the upper block 1U in the hole 4 of the lower block 1G.

In such a configuration, as described above, the block 1B can improve the radiation shielding function by reducing the shielding defect as compared with the blocks 1 and 1A. Therefore, the block 1B can obtain a higher radiation shielding effect than the blocks 1 and 1A.
The other effects of the block 1B are the same as those of the blocks 1 and 1A.

<Configuration of movable shielding block according to modification>
In the block 1B according to the second embodiment, the arrangement position of the holes 4 can be changed. FIG. 9 shows a configuration of a block 1C according to a modification of the second embodiment. In the example shown in FIG. 9B, the arrangement position of the hole 4 is reversed in the block 1C compared to the block 1B of the second embodiment (see FIG. 7B).

  FIG. 9 shows an example of the arrangement of the main part of the block 1C. FIG. 9A shows an arrangement example of the wheels 3 provided on the bottom surface side of the block main body 2, and FIG. 9B shows an arrangement example of the holes 4 provided on the upper surface side of the block main body 2. Show. In the example shown in FIG. 9, the block 1 </ b> C is provided with three wheels 3 on the bottom surface of the block main body 2 and three holes 4 on the top surface of the block main body 2, similarly to the block 1 </ b> B of the second embodiment. It has been.

As shown to Fig.9 (a), as for the block 1C, the wheel 3 is arrange | positioned in the same position as the wheel 3 of the block 1B of Embodiment 2. FIG.
On the other hand, as shown in FIG. 9B, in the block 1C, the hole 4 is arranged at a position opposite to the hole 4 of the block 1B of the second embodiment with the center line CL2 in the longitudinal direction as the center. That is, the block 1C includes an upper left area, an upper right area, and an area at the center in the horizontal width direction of the block body 2 and below the center in the vertical width direction (hereinafter referred to as “center lower stage”). In each region). Specifically, the hole 4 in the upper left region has a center point C4 at a distance T1 in the left direction from the center line CL1 and a position at a distance P2 in the upward direction from the center line CL2. Has been placed. Further, the hole 4 in the upper right region is arranged so that the center point C4 is located at a distance T1 in the right direction from the center line CL1 and at a distance P2 in the upward direction from the center line CL2. Yes. Further, the hole 4 in the lower center region is arranged such that the center point C4 is located on the center line CL1 and at a distance P2 downward from the center line CL2.

  FIG. 10 shows an installation example of the block 1C. FIG. 10A shows a state immediately before two blocks 1C are installed on the floor surface 20 as blocks 1G and one block 1C is integrated and arranged on the two blocks 1G as blocks 1U. Indicates the state. FIG. 10B shows a state after one block 1U is integrated and arranged on two blocks 1G.

  As shown in FIG. 10, in the block 1C, the lower block 1B (block 1G in the illustrated example) and the upper block 1B (block 1U) are arranged in the same direction. That is, in the block 1C, the odd-numbered block 1B in the vertical direction and the even-numbered block 1B in the vertical direction are arranged in the same direction. Thereby, the block 1C can fit the wheel 3 of the upper block 1U into the hole 4 of the lower block 1G.

  In the block 1C, as compared with the block 1B, the upper block 1U and the lower block 1G can be uniformly arranged in the same direction. Therefore, the worker may install according to the pattern of the holes 4 provided on the upper surface of the block body 2. Therefore, the block 1C can be installed more easily than the block 1B.

As described above, according to the blocks 1B and 1C according to the second embodiment, similarly to the blocks 1 and 1A according to the first embodiment, the load on the worker is reduced and the shielding member is transported and installed in a short time. can do.
In addition, according to the blocks 1B and 1C, the shielding defect can be reduced and the radiation shielding function can be improved as compared with the blocks 1 and 1A according to the first embodiment.

[Embodiment 3]
In the third embodiment, a block 1D in which the number of wheels 3 and holes 4 is increased as compared with the blocks 1 and 1A is provided.

  The configuration of the block 1D according to the third embodiment will be described below with reference to FIGS. FIG. 11 is a diagram illustrating an arrangement example of main parts of the movable shielding block 1D according to the third embodiment. FIG. 12 is a diagram illustrating an installation example of the movable shielding block 1D according to the third embodiment.

  FIG. 11 shows an arrangement example of main parts of the block 1D. 11A shows an arrangement example of the wheels 3 provided on the bottom surface side of the block main body 2, and FIG. 11B shows an arrangement example of the holes 4 provided on the upper surface side of the block main body 2. Show.

  As shown in FIG. 11, in the block 1 </ b> D, five wheels 3 are provided on the bottom surface of the block main body 2, and five holes 4 are provided on the top surface of the block main body 2.

  In the example shown in FIG. 11 (a), five wheels 3 are located in the upper center region of the bottom surface of the block body 2, the left side of the block body 2 in the horizontal direction and the central region in the vertical direction (hereinafter, “ A right middle region of the block body 2 and a central region in the vertical width direction (hereinafter referred to as a “right middle region”), a lower left region, and a lower right region. , One by one.

  Specifically, the wheel 3 in the upper center region is disposed such that the center point C3 is positioned on the center line CL1 and at a distance P3 upward from the center line CL2. Further, the wheel 3 in the middle left region is arranged such that its center point C3 is located at a distance T1 in the left direction from the center line CL1 and above the center line CL2. Further, the wheel 3 in the middle right region is arranged such that its center point C3 is positioned at a distance T1 in the right direction from the center line CL1 and above the center line CL2. Further, the wheel 3 in the lower left region is arranged so that the center point C3 is at a position of a distance T1 in the left direction from the center line CL1 and at a position of a distance P3 in the downward direction from the center line CL2. Yes. Further, the wheel 3 in the lower right region is arranged so that the center point C3 is located at a distance T1 in the right direction from the center line CL1 and at a distance P3 in the lower direction from the center line CL2. ing.

  In the example shown in FIG. 11A, the “position at a distance P3 upward from the center line CL2” is a position at a distance P4 from the front surface of the block body 2 (the upper surface in FIG. 11A). It has become. Further, “a position at a distance P3 downward from the center line CL2” is a position at a distance P4 from the rear surface of the block body 2 (the lower surface in FIG. 11A). The value of the distance P4 is half of the value of the distance P3 (that is, (1/2 × P3)).

  Further, in the example shown in FIG. 11B, the five holes 4 are formed on the upper surface of the block main body 2 in the upper center region, left middle region, right middle region, lower left region, and lower right region. One in each area is arranged.

  Specifically, the hole 4 in the upper center region is arranged so that the center point C4 is located on the center line CL1 and at a distance P3 upward from the center line CL2. Further, the hole 4 in the left middle region is arranged so that its center point C4 is located at a distance T1 in the left direction from the center line CL1 and above the center line CL2. Further, the hole 4 in the middle right region is arranged such that the center point C4 is located at a distance T1 in the right direction from the center line CL1 and above the center line CL2. Further, the hole 4 in the lower left region is arranged so that the center point C4 is located at a distance T1 in the left direction from the center line CL1 and at a distance P3 in the lower direction from the center line CL2. Yes. Further, the hole 4 in the lower right region is arranged so that the center point C4 is located at a distance T1 in the right direction from the center line CL1 and at a distance P3 in the lower direction from the center line CL2. ing.

  FIG. 12 shows an installation example of the block 1D. FIG. 12A shows a state immediately before two blocks 1D are installed on the floor 20 as blocks 1G and one block 1D is integrated and arranged on the two blocks 1G as blocks 1U. Indicates the state. FIG. 12B shows a state after one block 1U is integrated and arranged on two blocks 1G.

  As shown in FIG. 12, in the block 1D, the lower block 1D (block 1G in the illustrated example) and the upper block 1D (block 1U) are arranged in opposite directions. That is, in the block 1D, the odd-numbered block 1D in the vertical direction and the even-numbered block 1D in the vertical direction are arranged in opposite directions. The block 1D is arranged such that the upper center wheel 3 of the upper block 1U matches the upper center hole 4 of the lower block 1G. As a result, the block 1D can fit the wheel 3 of the upper block 1U into the hole 4 of the lower block 1G.

  In such a configuration, in the block 1D, the number of wheels 3 is increased compared to the blocks 1 and 1A according to the first embodiment. Therefore, the block 1D can reduce the load applied to each wheel 3. As a result, the block 1D can suppress wear of the wheel 3 and extend the life of the wheel 3 compared to the blocks 1 and 1A.

As described above, according to the block 1D according to the third embodiment, similarly to the blocks 1 and 1A according to the first embodiment, the load on the worker is reduced and the shielding member is transported and installed in a short time. Can do.
Moreover, according to the block 1D, the life of the wheel 3 can be extended compared to the blocks 1 and 1A according to the first embodiment.

[Embodiment 4 (reference example) ]
In the fourth embodiment, a flooring 30 that can be laid under the blocks 1, 1A, 1B, 1C, and 1D according to the first to third embodiments is provided. Here, the case where the block 1 is installed on the flooring 30 will be described. The fourth embodiment is a reference example.

  Hereinafter, the configuration of the flooring 30 according to the fourth embodiment will be described with reference to FIG. FIG. 13 is a diagram illustrating an installation example of the movable shielding block when the flooring according to the fourth embodiment is used. FIG. 13A shows a state immediately before the floor material 30 is installed on the floor surface 20 and one block 1 is installed on the floor material 30. Moreover, FIG.8 (b) has shown the state after the three blocks 1 are installed on the flooring 30 as the block 1G.

  As shown in FIG. 13A, the flooring 30 is formed in a plate shape that can be laid on the floor surface 20. And the floor material 30 is provided with the hole 31 in which the wheel 3 of the block 1 is fitted in the upper surface. The hole 31 is formed to have the same dimensions as the hole 4 (see FIG. 3B) provided in the block 1. Further, the depth of the hole 31 is set to a value slightly larger than the protruding amount of the wheel 3 from the bottom surface of the block body 2. Therefore, the flooring 30 is formed to be sufficiently thicker than the depth of the hole 31. In addition, it is preferable that the flooring 30 is a member which has the intensity | strength which can endure the load of many blocks 1 accumulated and arrange | positioned on it.

  As shown in FIG.13 (b), the block 1 is installed on the flooring 30 as the block 1G. At this time, the block 1G is in a stable state because the bottom surface of the block body 2 is in contact with the top surface of the flooring 30. Therefore, the flooring 30 can install the block 1 in a stable state. Further, the flooring 30 can prevent the block 1 from moving due to vibration when an earthquake occurs, and can obtain high earthquake resistance.

  In the fourth embodiment, in the block 1G, the wheel 3 is fitted into the hole 31 of the flooring 30. Therefore, when the flooring 30 is used, it is possible to delete the urging member such as the damper 8 from the block 1.

  As described above, according to the flooring 30 according to the fourth embodiment, the blocks 1, 1A, 1B, 1C, and 1D according to the first to third embodiments can be installed in a stable state. Moreover, according to the flooring 30, it is possible to prevent the blocks 1, 1A, 1B, 1C, and 1D according to the first to third embodiments from moving due to vibration when an earthquake occurs, and to obtain high earthquake resistance. Can do.

  The present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. In addition, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

For example, the present invention can be used not only in a nuclear power plant but also in various facilities related to radiation, such as an experimental facility such as an accelerator used for experiments of atomic nuclei and elementary particles, and a medical facility.
Further, for example, the number and positions of the wheels 3 and the holes 4 can be arbitrarily changed.
In addition, for example, the blocks 1, 1A, 1B, 1C, and 1D according to the first to third embodiments are moved by stretching an annular belt around a plurality of wheels and using the belt as an endless track (crawler). It may be configured. Such an endless track (crawler) is included in the wheel. Further, the present invention includes such an endless track (crawler) as an example of a wheel.
Further, for example, as in the fourth embodiment, when the block 1 is laminated on the floor material 30 having the hole 31 provided on the upper surface, the urging member such as the damper 8 that presses the wheel 3 is deleted. be able to.

  In addition, the block according to the present invention is provided with an even number of wheels 3 on the bottom surface of the block main body 2 as in the block 1 according to the first embodiment and 1A according to the modification of the first embodiment. When the even number of holes 4 are provided on the upper surface of the block body 2, the wheels 3 and the holes 4 may be provided as follows. That is, the wheels 3 are each provided at a predetermined pitch in the longitudinal direction of the block, and are provided in a position symmetrical with respect to the short direction of the block about the center line CL1 in the short direction. Good. Moreover, the hole 4 is good to be provided in the position facing the wheel 3 of the other block 1U laminated on the top.

  The block according to the present invention includes an odd number of wheels 3 in the block body 2 such as the block 1B according to the second embodiment, the block 1C according to the modification of the second embodiment, and the block 1D according to the third embodiment. When the odd number of holes 4 are provided on the upper surface of the block main body 2, the wheel 3 and the holes 4 are preferably provided as follows. That is, the wheels 3 are each provided at a predetermined pitch in the longitudinal direction of the block, and are provided in a position symmetrical with respect to the short direction of the block about the center line CL1 in the short direction. Good. Moreover, the hole 4 is good to be provided in the position facing the wheel 3 of the other block 1U laminated on the top.

  In the case of this configuration, the block according to the present invention can set the arrangement pattern of the wheels 3 and the arrangement pattern of the holes 4 like the block 1B according to the second embodiment and the block 1D according to the third embodiment. Good. That is, the arrangement pattern of the wheels 3 is a pattern in which one wheel 3 provided on the center line CL1 in the short-side direction is located at an end portion in the longitudinal direction than the other wheels 3, The arrangement pattern of the holes 4 may be a pattern in the same direction as the arrangement pattern of the wheels 3.

  Alternatively, in the case of this configuration, the block according to the present invention may set the arrangement pattern of the wheels 3 and the arrangement pattern of the holes 4 like the block 1C according to the modified example of the second embodiment described above. That is, the arrangement pattern of the wheels 3 is a pattern in which one wheel 3 provided on the center line CL1 in the short-side direction is located at an end portion in the longitudinal direction than the other wheels 3, The arrangement pattern of the holes 4 may be a pattern opposite to the arrangement pattern of the wheels 3.

1 (1G, 1U), 1A, 1B, 1C, 1D block (movable shielding block)
2 Block body 3 Wheel 4 Hole 5 Housing portion 6 Support mechanism 7 Axle 8 Bumper (biasing member)
20 Floor 30 Floor 31 Hole

Claims (9)

A block main body having a radiation shielding function for shielding radiation and capable of stacking a plurality of layers vertically;
One or more wheels provided on the bottom surface of the block body and moving the block body;
A movable shielding block, wherein a hole into which the wheel of another movable shielding block arranged in a stack is fitted is provided on the upper surface of the block body. An accommodation portion that is provided inside the block main body from the bottom toward the upper side, and accommodates the wheel;
A support mechanism that is provided inside the accommodating portion and supports the wheel so as to be slidable in a vertical direction in a rotatable state;
The support mechanism includes an urging member that pushes the wheel housed in the housing portion downward from the bottom surface of the block body,
The value of the pressing force by which one urging member pushes one wheel downward is larger than (the load of one movable shielding block / the number of the wheels) and (one 2. The movable shielding block according to claim 1, wherein the movable shielding block is set to be less than the load of the movable shielding block × 1.5 / the number of the wheels. An even number of the wheels are provided on the bottom surface of the block body,
An even number of holes are provided in the top surface of the block body;
Each of the wheels is provided at a predetermined pitch in the longitudinal direction of the movable shielding block, and is symmetrical with respect to the short direction of the movable shielding block about the center line in the short direction. It is provided in
3. The movable shielding block according to claim 1, wherein the hole is provided at a position facing the wheel of another movable shielding block arranged in a stacked manner on the hole. An odd number of wheels are provided on the bottom surface of the block body,
An odd number of holes are provided in the upper surface of the block body;
Each of the wheels is provided at a predetermined pitch in the longitudinal direction of the movable shielding block, and an even number is symmetrical about the center line in the short direction in the short direction of the movable shielding block. Provided on the center line in the short direction,
3. The movable shielding block according to claim 1, wherein the hole is provided at a position facing the wheel of another movable shielding block arranged in a stacked manner on the hole. The arrangement pattern of the wheels is a pattern in which one of the wheels provided on the center line in the short direction is located at the end in the longitudinal direction than the other wheels,
The movable shielding block according to claim 4, wherein the hole arrangement pattern is a pattern in the same direction as the wheel arrangement pattern. The arrangement pattern of the wheels is a pattern in which one of the wheels provided on the center line in the short direction is located at the end in the longitudinal direction than the other wheels,
The movable shielding block according to claim 4, wherein the arrangement pattern of the holes is a pattern opposite to the arrangement pattern of the wheels. The plurality of movable shielding blocks according to any one of claims 1 to 4 are stacked in a vertical direction in a state in which the positions are shifted in the longitudinal direction in each vertical row. A laminated structure of movable shielding blocks characterized by the above. The movable shielding block has an odd number of wheels provided on the bottom surface of the block body and an odd number of holes provided on the top surface of the block body.
Each of the wheels is provided at a predetermined pitch in the longitudinal direction of the movable shielding block, and an even number is symmetrical about the center line in the short direction in the short direction of the movable shielding block. Provided on the center line in the short direction,
The hole is provided at a position facing the wheel of another movable shielding block that is stacked on the top,
The arrangement pattern of the wheels is a pattern in which one of the wheels provided on the center line in the short direction is located at the end in the longitudinal direction than the other wheels,
The hole arrangement pattern is a pattern in the same direction as the wheel arrangement pattern,
When a plurality of movable shielding blocks are stacked in the vertical direction, the movable shielding blocks in the odd-numbered rows in the vertical direction and the movable shielding blocks in the even-numbered rows in the vertical direction are arranged in opposite directions. The laminated structure of the movable shielding block according to claim 7. The movable shielding block has an odd number of wheels provided on the bottom surface of the block body and an odd number of holes provided on the top surface of the block body.
Each of the wheels is provided at a predetermined pitch in the longitudinal direction of the movable shielding block, and an even number is symmetrical about the center line in the short direction in the short direction of the movable shielding block. Provided on the center line in the short direction,
The hole is provided at a position facing the wheel of another movable shielding block that is stacked on the top,
The arrangement pattern of the wheels is a pattern in which one of the wheels provided on the center line in the short direction is located at the end in the longitudinal direction than the other wheels,
The hole arrangement pattern is a pattern opposite to the wheel arrangement pattern,
When a plurality of movable shielding blocks are stacked in the vertical direction, the odd-numbered movable shielding blocks in the vertical direction and the movable shielding blocks in the even-numbered rows in the vertical direction are arranged in the same direction. The laminated structure of the movable shielding block according to claim 7.

Images