JP5631076B2 - Shielding wall - Google Patents

Description

  The present invention relates to a radiation shielding wall comprising a block wall that can be installed and removed in a facility having a radiation source such as a nuclear power plant.

  Conventionally, the shielding wall of a nuclear power plant is composed of a block wall 40 in which concrete blocks 41 shown in FIG. 7 are stacked as shown in FIG. 8 so that they can be removed for loading and unloading equipment at the regular inspection. A shielding wall SW is installed.

  The block wall 40 is a wall having a width W and a height H on the floor F by combining a small concrete block 41 of about 30 kg for manual work. Removal of the block wall 40 removes 1000 or more blocks 41 in order from the top, and moves them to a temporary storage location. Further, the reverse operation is performed at the time of restoration, and the assembly is performed in order from the bottom, so that a huge amount of work is required for removing and restoring the block wall 40. Since the conventional block wall 40 needs to be filled with a large amount of mortar 42 after assembling with the surrounding wall, it is necessary to perform a chipping operation of the mortar 42 and to dispose of a large amount of mortar waste.

  Further, as shown in FIG. 9, the conventional block wall 40 is formed by stacking upper and lower blocks 41 in a staggered manner. For example, in order to obtain a necessary opening 43, a wide range such as a removal range 44 is obtained. It is necessary to remove the block, and wasteful work has occurred.

  As described above, the conventional block wall has a large number of blocks to be worked, and requires a lot of time for work. For this reason, it is necessary to easily remove and restore the block wall and to increase the efficiency of the regular inspection work. Furthermore, since the mortar waste around the block wall generated when the current block wall is removed becomes radioactive waste, it is considered necessary from the viewpoint of environmental protection to prevent it from being generated as much as possible.

  Conventionally, as shown in Patent Document 1, for example, an example in which a steel box mold is filled and discharged with a fluid or a liquid, and a detachable wall for shielding is configured to be easily detachable from a building wall is known. ing. A steel box mold is formed as a single unit and fills and discharges a shielding material made of fluid or liquid. In this configuration, since it is composed of a single shielding wall, there is a limit to the size of the shielding wall that is installed only by manual work in a relatively narrow work space, and it is difficult to apply to a large-area shielding wall. There is no particular mention of the properties of the shielding material.

  Moreover, as shown in Patent Document 2, a temporary shielding facility is disclosed in which a simple radiation shielding container filled with a shielding material made of a fluid substance is stacked and installed. In this configuration, a plurality of containers are stacked and connected vertically and horizontally, and then a vertical row of shielding containers is filled with water or the like. In this case, since the shielding wall is formed by the container itself, the container strength must be sufficiently increased to withstand the lamination. On the other hand, if the strength is increased, the weight increases and the workability deteriorates, so it is difficult to use a shielding material having a sufficient shielding mass.

JP-A-60-147690 JP-A-8-114700

  An object of the present invention is to secure workability in a shielding wall made of a block wall, and the block of the block wall is configured to be divided and supported by a frame and a column or a horizontal frame. In addition, the present invention provides a novel shielding wall that reduces the number of blocks to be configured and supports the weight of each block individually. In addition, the material of the block wall ensures a specific gravity equal to or higher than that of conventional concrete in order to ensure a permanent and sufficient shielding property.

  The present invention is provided in a building wall of a facility having a radiation source, and is a radiation shielding wall composed of a block wall that can be installed and removed by stacking a plurality of blocks, and the shielding wall is a building wall. It is characterized in that a frame is provided between them, a vertical support is provided in the shielding wall, and the block is supported by the frame and the support.

  Further, the shielding wall is characterized by comprising a block wall that can be installed and removed, which is composed of a plurality of blocks formed of a solid shielding material.

  In addition, the shielding wall is characterized by comprising a block wall that can be installed and removed, and is composed of a plurality of blocks having a fluid shielding material capable of filling and discharging inside.

  Further, in the shielding wall, the shielding wall further includes a horizontal frame orthogonal to the support column, and the plurality of blocks are installed in a region surrounded by at least two of the frame body, the support column, and the horizontal frame. And

  Further, in the shielding wall, the frame body and the support column have an engaging portion that supports the block.

  In the shielding wall, the block is supported detachably from the frame body and the column as a single unit.

  In the shielding wall, the shielding material is a material having fluidity at room temperature.

  In the shielding wall, the shielding material is made of a material having a specific gravity of at least 2.15.

  In the shielding wall, the shielding material is mainly composed of barium sulfate.

  Furthermore, the block used for a shielding wall WHEREIN: This block provided the latching | locking part engaged with the said frame and a support | pillar on the side surface.

  Furthermore, the block used for the shielding wall has a supply port for the shielding material protruding forward from the shielding wall surface stacked on the top of the block, and the shielding material protruding forward from the shielding wall surface at the bottom of the block. It has a discharge port.

The present invention relates to a radiation shielding wall composed of a block wall that can be installed and removed which is formed by laminating a plurality of blocks, and has a frame body between the building wall and a vertical column in the shielding wall. has, by and removably supporting the block from the frame and struts alone, it is possible to greatly improve the workability compared to conventional block. Furthermore, the shielding property of the shielding wall can be improved by inserting a shielding iron plate between the upper and lower blocks.

  Furthermore, by using a frame provided around the block wall, the amount of mortar used can be reduced, and the generation of waste can be greatly suppressed.

The front view of the block wall of Example 1 of this invention The enlarged front view of the block wall of Example 1 of this invention The perspective view of the block single-piece | unit of Example 1 of this invention Side surface schematic diagram of the block wall of Example 1 of the present invention The front view of the block wall of Example 2 of this invention The front view of the block wall of Example 3 of this invention Perspective view of a conventional block alone Front view of conventional block wall Front view showing the removal range of the block wall of the conventional example

  Embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, the shielding wall SW (Shielding Wall) which consists of a block wall in Example 1 of this invention is demonstrated.

  A steel frame body 4 is provided on a part of the building wall, a steel support column 3 is provided therein, and the hollow steel block 1 is supported by the steel frame body 4 and the steel support column 3. A shielding iron plate 5 having a spacer function is inserted between the upper and lower steel blocks 1. 6 is an inlet for shielding material, and 7 is an outlet for shielding material. Reference numeral 8 denotes a stepped locking portion (ago) provided on the side surface of the steel block 1. Reference numeral 9 denotes an engaging groove as an engaging portion which is provided on the steel column 3 and engages with the locking portion 8 of the steel block 1. You may provide an engaging groove and a latching | locking part in any. As a result, a shielding wall SW having a width W and a height H is formed on the floor surface F.

  3 and 4, 1 is a steel block, and 2 is a fluid liquid shielding material filled inside. On the side surface of the steel block 1, a supporting locking portion 8 protrudes. A feed inlet 6 for filling the shielding material 2 is provided at the upper part of the steel block 1, and an outlet 7 for discharging the shielding material 2 is provided at the lower part of the steel block 1. 10 is a filling pipe for filling the shielding material 2, and 11 is a discharge pipe for discharging the shielding material 2. Reference numeral 5 denotes a shielding iron plate having a spacer function provided at the bottom of the steel block 1.

  The fluid inlet 6 of the liquid shielding material 2 made of barium sulfate or the like is installed at the uppermost part of the steel frame 1, and the steel frame 1 is laminated to facilitate the feeding of the shielding material 2. Install it so that it protrudes forward (front side) from the wall of the block wall. In addition, the discharge port 7 is installed at the lowermost part of the steel frame 1 and is installed so as to protrude forward from the wall surface of the block wall in order to facilitate the discharge of the shielding material 2 in the same manner as the supply port 6. In the case of a shielding material made of powder, it is difficult to supply and discharge with such a configuration.

By setting the volume of one steel block 1 to about 1.0 m ³ , the volume of the block used for the conventional shielding wall SW is almost 100 times larger. It becomes possible to improve about 100 times.

  By increasing the size of one block, the weight increases, but the material of the shielding wall SW is divided into a steel block 1 made of a steel frame (box) and a shielding material 2 filled therein, and the shielding material By discharging 2, only the steel block 1 can be removed and restored, and the weight of the block and the work can be facilitated.

The shielding material 2 to be filled is assumed to be fluid at normal temperature, and a material having a specific gravity of at least a specific gravity of concrete (2.15 g / cm ³ ) or more is used in order to ensure sufficient radiation shielding properties. A material in which barium sulfate is dispersed in a solution is used as a medical material and is not harmful to the human body. It is liquid at room temperature and has a specific gravity of about 4.5 g / cm ^3. Suitable as The shielding material 2 can be reused by being discharged from the shielding material discharge port 7 before being removed, packed and stored in a drum can, etc., and refilled at the time of restoration. The fluid shielding material 2 can be easily discharged by placing a discharge container such as a drum can under the discharge port provided at the bottom of the block wall. It can be reused during recovery. With the above configuration, a sufficient shielding property can be obtained permanently.

In order not to generate waste as much as possible, the entire wall opening is made of a steel frame 4 so as not to use mortar around the block wall, and it is not necessary to delaminate the mortar during removal and to fill the mortar during restoration.

  The steel block 1 is individually supported by the steel frame 4 and the steel support 3, and it is not necessary to support the upper weight at the time of lamination, and can be constructed with the minimum required strength. Can be lightly formed. Further, when the steel block 1 is replaced by an internal inspection or the like, the steel block 1 can be easily removed individually for each steel block, and the workability is excellent.

The block wall according to the first embodiment of the present invention is made of a steel block 1 made of a steel frame as a large single unit of about 1.0 m ³ , and a shielding material having fluidity in the steel block 1 at room temperature. Shielding performance is secured by pouring 2 in. The steel frame provided around the steel block 1 does not need to be removed when the steel frame of the single block wall is pulled out. Therefore, since it is only necessary to use mortar or the like, the generation of waste can be suppressed, and work efficiency can be improved.

  Next, a second embodiment of the present invention will be described with reference to FIG. A steel frame 24 is provided on a part of the building wall, a steel support 23 is provided therein, and a solid concrete block 21 is supported by the steel frame 24 and the steel support 23. Between the upper and lower concrete blocks 21, a shielding iron plate 5 having a spacer function is inserted.

  Reference numeral 29 denotes an engagement groove that is provided in the steel frame body 24 and the steel column 23 and engages with the block 21. The block 21, which is a large concrete block, is a block or panel having a size of about 1 m in length and width, and has an arbitrary thickness depending on a required shielding rate. The block 21 has an engaging portion 28 that engages with the engaging groove 29, and the weight thereof is supported by a steel frame body 24 and a steel column 23. Since the block 21 has a large weight, a suspension ring, a metal fitting, etc. (not shown) are fixed, and the block 21 is attached to and detached from the shielding wall WS using a transport machine.

  Next, a third embodiment of the present invention will be described with reference to FIG. Reference numeral 34 denotes a steel frame, 33 denotes a steel support, and 35 denotes a steel horizontal frame orthogonal thereto. Each region divided by these is filled with a plurality of conventionally used concrete blocks 41. There are no engagement grooves in the steel frame body 34 and the steel column 33, and the weight of the plurality of blocks 41 is supported by the steel horizontal frame 35. Further, a plurality of blocks 41 are installed in a region surrounded by at least two of the steel frame 34, the steel support 33, and the steel horizontal frame 35.

  In the above configuration, when it is necessary to remove any of the areas divided by the steel frame 34, the steel support 33, and the horizontal frame 35 of the shielding wall SW, the block of only that area is removed. This eliminates unnecessary block removal work, and the work efficiency is greatly improved. Moreover, the generation of waste can be suppressed as much as possible.

DESCRIPTION OF SYMBOLS 1 Steel block 2 Fluid shielding material 3, 23, 33 Steel support | pillar 4, 24, 34 Steel frame body 5 Shielding iron plate 6 Feed inlet 7 Outlet 8 Locking part 9 Engaging groove 35 Steel horizontal frame 20 Block Walls 21, 41 Concrete block SW Shielding wall

Claims (6)

In the radiation shielding wall consisting of a block wall that can be installed and removed, which is provided in the building wall of a facility having a radiation source and is constructed by laminating a plurality of blocks,
The shielding wall has a frame body between the building wall and a vertical column in the shielding wall, the block is supported by the frame body and the column, and the block is a single unit. A shielding wall characterized in that a shielding iron plate is inserted between the upper and lower blocks, and is supported detachably from a frame and a column .   2. The shielding wall according to claim 1, wherein the shielding wall comprises a block wall that can be installed and removed, and is composed of a plurality of blocks made of a solid shielding material.   2. The shielding wall according to claim 1, wherein the shielding wall comprises a plurality of blocks having a shielding material having fluidity capable of filling and discharging inside and a block wall capable of being removed.   4. The shielding wall according to claim 2, wherein the frame body and the support column have an engaging portion that supports the block. 5.   The block used for the shielding wall according to claim 2 or 3, wherein the block is provided with a locking portion on a side surface for engaging with the frame body and the support column.   The block used for the shielding wall according to claim 3, further comprising a shielding material supply port projecting forward from the shielding wall surface laminated on the uppermost part of the block, and at the lowermost part of the block forward of the shielding wall surface. A block for a shielding wall, characterized by having a protruding outlet for shielding material.

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