JP2007046996A - Block wall and radiation ray shield wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a block wall of which material cost is low, which provides excellent construction property and quake resistance, and which can provide a function as a shield wall sufficiently. <P>SOLUTION: A tentative opening part 2 of the radiation ray shield wall 1 is blocked by a block wall 10 provided with a pair of hook shaped block layers 11, 11 formed by stacking hook type blocks b1 formed in a hook shape in cross section oppositely to a thickness direction of the radiation ray shield wall 1, and a rectangular block layer 12 formed by stacking rectangular blocks b2 of a rectangular solid shape between the pair of the hook shaped block layers 11, 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a block wall for closing a temporary opening of a radiation shielding wall, and a radiation shielding wall using the block wall.

  In a nuclear power plant, a nuclear fuel reprocessing facility, a medical radiation utilization facility, and the like, a radiation shielding wall is constructed around the radiation source for the purpose of preventing outflow of radiation to the outside. Such a radiation shielding wall is provided with a temporary opening, and is configured to be able to improve internal equipment or replace consumables.

Conventionally, the temporary opening has been closed by a wet concrete block wall formed by stacking concrete blocks while adhering them with cement mortar. However, the wet concrete block wall has a problem that it takes time to construct by cement mortar adhesion and the material cost of cement mortar increases.
On the other hand, a dry concrete block wall in which concrete blocks are emptied without using cement mortar has a problem that it is inferior in earthquake resistance.

  Therefore, in Patent Document 1, as shown in FIGS. 5 (a) to 5 (c), it is constructed using a concrete block 110 in which the front surface and the back surface form a plane, and both side surfaces and the upper and lower surfaces are formed in a corrugated shape. An improved concrete block wall 100 is disclosed.

The concrete block wall 110 is a dry concrete block wall 100 which is fitted by engaging the irregularities of the corrugations of the concrete blocks 110 adjacent to each other vertically and horizontally.
Japanese Examined Patent Publication No. 3-30839 (pages 2 to 4, FIGS. 1 to 17)

However, since the conventional concrete block wall 100 needs to be corrugated so that the concrete blocks 110, 110,... Arranged in a staggered manner are fitted to each other, various types of concrete blocks 111 (111a) are required. , 111b, 111c), 112,..., And there is a problem that the manufacturing effort and cost increase.
In addition, the uneven surface formed on the concrete block 110 may be damaged due to contact with something during transportation. In this case, a gap is formed between the concrete blocks 110, which may cause radiation leakage. is there.

Further, the stacking work of the complicated concrete blocks 110, 110,... While being fitted to the corrugations of the upper, lower, left and right concrete blocks 110, 110,. It takes time and effort to manage.
Furthermore, when the thickness of the concrete block wall 100 changes, it is necessary to manufacture the concrete block 110 according to the thickness, and the cost for it increases.

  The present invention has been made to solve the above-described problems, and has a low material cost, is excellent in workability and earthquake resistance, and sufficiently exhibits a function as a shielding wall. And to propose a radiation shielding wall using this.

  In order to solve the above-mentioned problem, the present invention provides a block wall for closing a temporary opening of a radiation shielding wall, and a pair of first wall configurations arranged facing each other in the thickness direction of the radiation shielding wall The first wall constituting portion is formed by stacking bowl-shaped blocks, and is characterized in that a convex portion is formed at the lower end and a concave portion is formed at the upper end in a side view.

  Such a block wall is formed by stacking a pair of opposing first wall constituent portions formed in a bowl shape, so that the block walls are locked to each other, and the front and rear (radiation shielding) of the block wall due to an earthquake or the like. The horizontal force acting on the inside or outside of the wall does not shift in the horizontal direction.

  Moreover, since it is constructed only by stacking so that the portions formed in a bowl shape are engaged, a block wall excellent in earthquake resistance is constructed without requiring an adhesive such as cement mortar. Therefore, it is excellent in workability and can reduce the material cost required for cement mortar and the like.

Moreover, since the block formed in the bowl shape is used, the joint is bent instead of a straight line. If the joint is bent, the radiation does not flow out of the joint, so that the function as a radiation shielding wall is not impaired.
In addition, since the blocks having the same cross-sectional shape can be used, the material cost (manufacturing cost) can be reduced as compared with the conventional method that requires many types of blocks.

  Further, since the block wall has irregularities at the upper and lower ends, if a filler (for example, cement mortar) is filled in the gap between the radiation shielding wall and the temporary opening, force is transmitted to the radiation shielding wall. Is preferable because it is fixed.

  The invention according to claim 2 is the block wall according to claim 1, which is formed by stacking rectangular parallelepiped blocks between the pair of first wall components. It is characterized in that a wall component is arranged.

  According to such a block wall, a block wall having a wall thickness corresponding to the wall thickness of the radiation shielding wall can be constructed. Here, the rectangular parallelepiped blocks may be arranged in a plurality of rows according to the wall thickness.

  The invention according to claim 3 is the block wall according to claim 1 or 2, characterized in that end faces of the respective wall constituent portions are shifted.

  Such a block wall is configured such that the joints of the respective block layers are bent instead of being straight, so that radiation does not leak from the joints of the blocks and is excellent in safety.

  The invention according to claim 4 is a radiation shielding wall in which the temporary opening is closed by the block wall according to any one of claims 1 to 3, wherein the convex is formed at a lower end of the temporary opening. A groove corresponding to the portion is formed.

  Such a radiation shielding wall has a groove formed at the lower end of the temporary opening, and if the convex portion formed at the lower end of the block wall is locked, the lower end of the block wall is directed inward and outward of the radiation shielding wall due to an earthquake or the like. This is preferable because it does not shift due to the horizontal force.

  The invention according to claim 5 is the radiation shielding wall according to claim 4, characterized in that a protrusion is formed at the upper end of the temporary opening.

  Such a radiation shielding wall has a resistance when a horizontal force in the inner and outer directions of the radiation shielding wall is generated by engaging a protrusion formed at the upper end of the temporary opening and a recess formed at the upper end of the block wall. This prevents the block wall from falling inward and outward of the radiation shielding wall.

  Furthermore, the invention according to claim 6 is the radiation shielding wall according to claim 4 or 5, wherein a groove is formed on one side of the temporary opening, and a protrusion is formed on the other side. It is characterized by being.

  Since such a radiation shielding wall is further formed with grooves and ridges on the sides of the opening, when a horizontal force is applied to the block wall, a resistance force is generated by these grooves and ridges, Prevent the block wall from falling. That is, since the filler filled in the gap between the end portion of the block wall or the block wall and the end portion and the side portion of the opening portion is locked to the groove and the protrusion formed on the side portion of the opening portion, The horizontal displacement of the block wall is suppressed.

  According to the present invention, it is possible to construct a block wall and a radiation shielding wall using the same, which are inexpensive in material cost, excellent in workability and earthquake resistance, and sufficiently exhibit the function as a shielding wall. Become.

Preferred embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.
Here, FIG. 1 is a perspective view showing a block wall according to the present embodiment. FIG. 2 is a perspective view showing each block of the block wall according to the present embodiment, wherein (a) shows a bowl-shaped block and (b) shows a rectangular parallelepiped block. 3 is a view showing each cross section of the radiation shielding wall in which the block wall shown in FIG. 1 is installed, in which (a) is a front sectional view (AA cross section in FIG. 1), and (b) is a cross section. A longitudinal sectional view (a BB section in FIG. 1) and (c) show a transverse sectional view (a CC section in FIG. 1), respectively. Furthermore, (a)-(c) of FIG. 4 is a longitudinal cross-sectional view which shows the modification of the block wall based on this embodiment.

In the radiation shielding wall 1 according to the present embodiment, as shown in FIG. 1, a temporary opening 2 formed for preparation of equipment and the like inside the radiation shielding wall 1 is closed by a block wall 10. .
As shown in FIG. 1, the block wall 10 has a pair of vertical block layers (first wall configuration) facing the temporary opening 2 of the radiation shielding wall 1 in the thickness direction of the radiation shielding wall 1. Part) 11,11. The saddle-shaped block layers 11 and 11 are constituent members of the block wall 10 formed by stacking concrete blocks (hereinafter also referred to as “saddle-shaped blocks”) b1 having a cross-sectional saddle shape.

In addition, a rectangular block layer (second wall) formed by stacking rectangular parallelepiped concrete blocks (hereinafter also referred to as “rectangular blocks”) b2 between the pair of vertical block layers 11 and 11. The component part) 12 is arranged, and the block wall 10 is formed to have a thickness necessary for the radiation shielding wall 1.
Here, the inside and the outside of the radiation shielding wall 1 in the description are unified in the direction shown in FIG.

  As shown in FIG. 2 (a), the saddle block b1 has a shape in which two rectangular parallelepiped blocks are connected in a vertically shifted state, and its side cross-sectional shape exhibits a saddle shape. ing. That is, a rectangular parallelepiped upper half b11 and a lower half b12 having the same shape are provided, and the lower half b12 is connected to the side surface of the upper half b11 while being shifted downward. In the present embodiment, the saddle-shaped block layers 11, 11 arranged on the inner side and the outer side are arranged in opposite directions with respect to the thickness direction of the radiation shielding wall 1 by arranging the same-shaped saddle-shaped blocks b 1. Although it was set as the structure which opposes, it cannot be overemphasized that the thing of a different shape may be used for the saddle-type block b1, b1 arrange | positioned inside and outside, respectively.

  As shown in FIG. 2B, the rectangular block b2 is a concrete block formed in a rectangular parallelepiped, and is arranged according to the wall thickness of the radiation shielding wall 1. Needless to say, the rectangular block b2 may be formed in a cube. Further, the rectangular block b2 according to the present embodiment is formed so that the thickness and the width thereof are the same as the vertical block b1, and the height is a height obtained by subtracting the deviation in the height direction of the vertical block b1. That is, the height of one rectangular parallelepiped block (upper half b11 or lower half b12) of the bowl-shaped block b1 shaped such that two rectangular parallelepiped blocks are connected in a vertically shifted state. It is formed to be the same. The shape relationship between the bowl-shaped block b1 and the rectangular block b2 is not limited to the above, and may be set as appropriate.

  The vertical block b1 and the rectangular block b2 may be reinforced concrete or unreinforced concrete. Further, the composition, strength, and the like of the concrete constituting the vertical block b1 and the rectangular block b2 are not limited, and are set as appropriate. Furthermore, the material of the bowl-shaped block b1 and the rectangular block b2 is not limited, and may be appropriately selected from known materials that can prevent the outflow of radiation to the outside.

  As shown in FIGS. 3A to 3C, the block wall 10 is disposed so as to close the temporary opening 2 of the radiation shielding wall 1. In this embodiment, the block wall 10 is disposed outside and inside. It has a three-layer structure of a vertical block layer 11 and a rectangular block layer 12 disposed in the middle.

  As shown in FIG. 3B, the block wall 10 has a convex portion at the lower end (hereinafter sometimes referred to as “lower end convex portion 13”) and a concave portion at the upper end (hereinafter referred to as “upper end concave portion 14”). Is formed). The vertical block layer 11 is stacked so that the upper half b11 side is positioned on the surface side of the block wall 10, and the upper end of the upper half b11 projects upward. Further, the rectangular block layer 12 is arranged such that the lower end forms a plane with the lower end of the lower half b12 of the both-side block layer 11.

  Further, as shown in FIG. 3C, the block wall 10 is disposed in a state where the end face of the rectangular block layer 12 and the end faces of the outer and inner saddle block layers 11, 11 are shifted to the left and right. . That is, one side end portion (the left end portion in the present embodiment) of the block wall 10 is configured such that the end face of the rectangular block layer 12 protrudes from the end faces of the two-sided block layers 11 and 11. Therefore, the block wall 10 has a convex portion 15 on one side surface and a concave portion 16 on the other side surface.

  As shown in FIG. 3A, the radiation shielding wall 1 is formed with a rectangular temporary opening 2, and a block wall 10 is disposed on the inner surface of the temporary opening 2 to temporarily The opening 2 is closed. Note that a gap formed between the temporary opening 2 and the periphery of the block wall 10 is filled with a filler 17 so that the temporary opening 2 is completely shielded. In the present embodiment, cement mortar is used as the filler 17, but the material of the filler 17 is not limited, and it is possible to fix the block wall 10 to the temporary opening 2, and to release radiation to the outside. What is necessary is just to be able to prevent the outflow.

  As shown in FIG. 3 (b), a groove 3 is formed at the lower end of the temporary opening 2 and is formed in the same shape as the lower end convex portion 13 of the block wall 10. And the lower end convex part 13 of the block wall 10 is fitted by the groove | channel 3 of the temporary opening part 2. As shown in FIG.

  Further, at the upper end of the temporary opening 2, a protrusion 4 is formed at a location corresponding to the upper end recess 14 of the block wall 10.

  Furthermore, the groove | channel 5 or the protrusion 6 is each formed in the left-right side part of the temporary opening part 2, as shown in FIG.3 (c).

The construction of the block wall 10 is performed according to the following procedure.
(1) The inner and outer saddle blocks b1 and b1 are dropped into the groove 3 formed at the lower end of the temporary opening 2, and the rectangular block b2 is disposed between the saddle blocks b1 and b1. (See FIG. 3B).

  (2) Subsequently, after arranging the rectangular block b2 in the recess formed by the lower vertical blocks b1 and b1 and the rectangular block b2, the inner and outer vertical blocks b1 and b1 are dropped from both sides. Then, the block wall 10 is piled up to a predetermined height (see FIG. 3B).

  (3) When the blocks b1 and b2 are stacked to a predetermined height, the filler 17 is filled into the gap formed between the temporary opening 2 and the block wall 10. At this time, in order to prevent the filler 17 from flowing out, a mold (not shown) is installed in front of and behind (inside and outside) the portion corresponding to the gap between the temporary opening 2 and the block wall 10. If the filler 17 is a material having fluidity that does not flow out of the gap, there is no need to install a mold.

  (4) When the filler 17 exhibits sufficient strength, the mold is removed and the block wall 10 is completed.

Since the block wall 10 according to the present embodiment is constructed by simply stacking the blocks b1 and b2 without using an adhesive (joint material) such as cement mortar, the construction is easy and the material required for the joint material Cost can be omitted and it is inexpensive.
In addition, the use of the joint material prevents the joint material from being scattered and the site from becoming dirty.

  The block wall 10 is formed by stacking the outer and inner saddle block layers 11 so that the saddle blocks b1 face each other and mesh with each other, and is separately fixed to prevent horizontal displacement. Exhibits excellent seismic performance without requiring any means.

  Further, since the joints b1 and b2 do not interpose a joint material, they are not fixed integrally and can be easily disassembled (removed). Therefore, the blocks b1 and b2 can be reused even when the block wall 10 is disassembled and reconstructed during operations such as inspection, repair, replacement, and repair of the equipment in the radiation shielding wall 1. It is economical and can be constructed in a short period of time compared to the prior art.

  Further, as shown in FIGS. 3B and 3C, the block wall 10 is stacked with the saddle-shaped blocks b1 having the saddle-shaped cross-sections engaged with each other, and the end faces of the blocks b1 and b2 are shifted. Therefore, the joints of the bowl-shaped block layer 11 and the rectangular block layer 12 are formed in a state having a break point instead of a straight line. Therefore, the radiation is prevented from flowing out through the joint, and the function of the radiation shielding wall 1 is not lowered at the temporary opening 2.

Since the block wall 10 according to the present embodiment is formed by only two blocks by stacking the vertical block b1 and the rectangular block b2 formed in the same shape, it can be constructed inexpensively and easily. is there.
That is, since the block wall 10 is formed by the vertical block b1 and the rectangular block b2 having a standard shape, it is not necessary to use various blocks, and it is possible to reduce manufacturing costs and the management thereof. Is also easy and suitable.

  Further, the block wall 10 according to the present embodiment has the vertical block b1 and the rectangular block b2 and the rectangular blocks b1 and b1 and the rectangular blocks before and after the vertical block b1 and the rectangular block b2 are dropped into the groove 3 formed in the temporary opening 2. By dropping the upper vertical block b1 and the rectangular block b2 into the recess formed by b2, the work is simple because it is formed without requiring surveying or fine adjustment.

  The radiation shielding wall 1 according to the present embodiment has a groove 3 formed at the lower end of the temporary opening 2, and the block wall 10 is formed with the lower end convex portion 13 fitted in the groove 3. Even when a horizontal force is applied due to an earthquake or the like, the block wall 10 is not displaced, and the earthquake resistance is ensured.

  Further, a protrusion 4 is formed at the upper end of the temporary opening 2, and the gap between the temporary opening 2 and the block wall 10 has a break point due to the protrusion 4 and the upper end recess 14 of the block wall 10. Is formed. Therefore, the filling material 17 filled in the gap is solidified so that force can be transmitted to each other. Even when a horizontal force is applied to the block wall 10 due to an earthquake or the like, the upper end of the block wall 10 is displaced. It does not come out and is stable.

  Further, since the groove 5 and the ridge 6 are formed on the side of the opening 2, the side recess 16 formed by shifting the end surfaces of the rectangular block layer 12 and the both-side block layer 11 and Since the gap between the temporary opening 2 and the block wall 10 is formed in a state having a break point by the side convex portion 15, the filler 17 filled in the gap is solidified, so Communication is possible. Therefore, even if the horizontal force in the inner and outer directions acts, the shift at the side portion of the block wall 10 is suppressed. In the present embodiment, the block wall 10 is configured to be constructed with a temporary opening 2 and a gap on the side thereof, but is not limited thereto, and the side surface of the block wall 10 is You may build the block wall 10 in the state contact | abutted to the inner surface of the temporary opening part 2. FIG. In this case, if the groove 5 and the protrusion 6 of the temporary opening 2 are formed corresponding to the protrusion 15 and the recess 16 of the block wall 10, the protrusion 15 is inserted into the groove 5 and the protrusion 6 is inserted into the recess 16. It is preferable to construct the block wall 10 in a state where the block wall 10 is inserted into the frame because the side surface of the block wall 10 is locked to the side surface of the temporary opening 2 and the earthquake resistance is improved without requiring a filler.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and it goes without saying that the above-described constituent elements can be appropriately changed in design without departing from the spirit of the present invention.
For example, in the above-described embodiment, the block wall 10 is formed by three layers of the vertical block layer 11 disposed on the inner side and the outer side and the rectangular block layer 12 disposed between the vertical block layers 11 on both sides. However, if the wall thickness of the radiation shielding wall 1 is thin like the block wall 10a shown in FIG. 4A, the rectangular block layer 12 is omitted and the inside and outside are omitted. It may be formed of two layers of the vertical block layer 11.

On the other hand, when the thickness of the radiation shielding wall 1 is thick, the wall thickness of the block wall 10b is increased by increasing the number of the rectangular block layers 12 as shown in FIG. Also good.
That is, the quantity of the rectangular block layer 12 is not limited and can be set as appropriate according to the designed wall thickness of the radiation shielding wall 1.

  Further, the shape of the rectangular block b2 is not limited, and may be set as appropriate according to the shape of the temporary opening 2 of the radiation shielding wall 1.

  Moreover, in the said embodiment, although the rectangular block b2 shall be arrange | positioned so that the lower end of the rectangular block layer 12 may make a plane with the lower end of the front and back vertical block layers 11, as shown in FIG.4 (c). The lower end position may be shifted. With this configuration, since a plurality of lower end convex portions 13 are formed at the lower end of the block wall 10, the degree of fixation to the radiation shielding wall 1 is further increased.

  In the above-described embodiment, the end surfaces of the respective block layers are shifted and arranged. However, the end surfaces of the respective block layers are not necessarily shifted, and may be arranged so as to form a plane.

  Moreover, the groove | channel and protrusion formed in the side part of a temporary opening part should just be formed as needed, and may be abbreviate | omitted if the earthquake resistance of a block wall is ensured.

Here, FIG. 1 is a perspective view showing a block wall according to a preferred embodiment of the present invention. It is a perspective view showing each block of a block wall concerning a suitable embodiment of the present invention, and (a) shows a bowl-shaped block and (b) shows a rectangular parallelepiped block, respectively. It is a figure which shows each cross section of the radiation shielding wall in which the block wall shown in FIG. 1 was installed, (a) is a front cross-sectional view, (b) is a longitudinal cross-sectional view, (c) shows a cross-sectional view, respectively. Yes. (A)-(c) is a longitudinal cross-sectional view which shows the modification of the block wall based on the embodiment. It is a figure which shows the conventional radiation shielding wall, Comprising: (a) is a front view, (b) is XX sectional drawing of (a), (c) is YY sectional drawing of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Radiation shielding wall 2 Temporary opening 3,5 Groove 4,6 Projection 10 Block wall 11 Vertical block layer (1st wall structure part)
12 rectangular block layer (second wall component)
13 Lower end convex portion 14 Upper end concave portion b1 Vertical block (block with cross-sectional shape)
b2 rectangular block (rectangular block)

Claims (6)

A block wall that closes the temporary opening of the radiation shielding wall,
A pair of first wall components disposed opposite to each other in the thickness direction of the radiation shielding wall,
The first wall constituent part is formed by stacking bowl-shaped blocks,
A block wall having a convex portion at a lower end and a concave portion at an upper end in a side view.   2. The block wall according to claim 1, wherein a second wall constituent part formed by stacking rectangular parallelepiped blocks is disposed between the pair of first wall constituent parts.   3. The block wall according to claim 1, wherein an end face of each of the wall constituent portions is deviated. A radiation shielding wall in which the temporary opening is closed by the block wall according to any one of claims 1 to 3,
A radiation shielding wall, wherein a groove corresponding to the convex portion is formed at a lower end of the temporary opening.   The radiation shielding wall according to claim 4, wherein a protrusion is formed at an upper end of the temporary opening.   6. The radiation shielding wall according to claim 4, wherein a groove is formed on one side of the temporary opening and a protrusion is formed on the other side.

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