JP2002267792A - Construction method of radiation shielding mortar structure and construction method of radiation shielding concrete structure - Google Patents
Construction method of radiation shielding mortar structure and construction method of radiation shielding concrete structureInfo
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- JP2002267792A JP2002267792A JP2001064376A JP2001064376A JP2002267792A JP 2002267792 A JP2002267792 A JP 2002267792A JP 2001064376 A JP2001064376 A JP 2001064376A JP 2001064376 A JP2001064376 A JP 2001064376A JP 2002267792 A JP2002267792 A JP 2002267792A
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- radiation shielding
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- mortar
- fine aggregate
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、核燃料物質、放射
性物質、放射線を使用する各種施設等の構造物として好
適な放射線遮蔽用モルタル構造物の施工方法及び放射線
遮蔽用コンクリート構造物の施工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of constructing a radiation shielding mortar structure and a method of constructing a radiation shielding concrete structure suitable as structures of various facilities using nuclear fuel materials, radioactive materials, and radiation. .
【０００２】[0002]
【従来の技術】従来より、原子力関連施設は、その施設
の一部に放射線を遮蔽できるコンクリート構造物又はモ
ルタル構造物を使用することがある。コンクリート構造
物の放射線遮蔽効果は、一般的にコンクリートの比重が
高いほど高くなるので、セメントに混ぜ合わせる粗骨
材、細骨材として比重の高いものを使用することが望ま
しく、一般的には磁鉄鉱などの鉱物を破砕して得た粗骨
材、細骨材を配合したコンクリート構造物が使用されて
いる。また、モルタル構造物も、セメントに混ぜ合わせ
る細骨材として比重の高いものを使用すると、放射線遮
蔽効果が高まるので、磁鉄鉱などの鉱物を細かく破砕し
て得た細骨材が使用されている。2. Description of the Related Art Conventionally, a nuclear-related facility sometimes uses a concrete structure or a mortar structure capable of shielding radiation in a part of the facility. Since the radiation shielding effect of concrete structures generally increases as the specific gravity of concrete increases, it is desirable to use coarse aggregates and fine aggregates with high specific gravity mixed with cement, and generally magnetite. Concrete structures containing coarse aggregates and fine aggregates obtained by crushing minerals such as these are used. In addition, when a mortar structure having a high specific gravity is used as a fine aggregate to be mixed with cement, a radiation shielding effect is enhanced. Therefore, a fine aggregate obtained by finely crushing a mineral such as magnetite is used.
【０００３】[0003]
【発明が解決しようとする課題】しかし、骨材として磁
鉄鉱などの鉱物を使用するのは、資源の保全の観点から
みると望ましくなく、またコストも高い。一方、電化製
品や電子機器の部品として使用されている焼成フェライ
トは、その製造過程や使用済みの電化製品や電子機器の
解体時に廃材として大量に排出され、その処分方法が問
題になっている。However, the use of a mineral such as magnetite as an aggregate is not desirable from the viewpoint of resource conservation, and the cost is high. On the other hand, calcined ferrite used as a component of electric appliances and electronic devices is discharged in large quantities as waste material during the manufacturing process and during disassembly of used electric appliances and electronic devices, and the disposal method has become a problem.
【０００４】また、建物の解体によって生じるコンクリ
ート又はモルタル廃材も、資源の有効利用の観点からそ
の再生利用が望まれている。本発明は、以上の問題点を
解決するもので、放射線遮蔽効果を十分に発揮し、強度
低下やひび割れを防止するとともに、産業廃棄物の再資
源化を図ることで経済的に製造することができる放射線
遮蔽用モルタル構造物の施工方法及び放射線遮蔽用コン
クリート構造物の施工方法を提供することを目的として
いる。[0004] Recycling of concrete or mortar waste generated by demolition of buildings is also desired from the viewpoint of effective use of resources. The present invention solves the above-mentioned problems, and exhibits a sufficient radiation shielding effect, prevents strength reduction and cracking, and can be manufactured economically by recycling industrial waste. It is an object of the present invention to provide a method of constructing a mortar structure for radiation shielding and a method of constructing a concrete structure for radiation shielding.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成するため
に、請求項１記載の放射線遮蔽用モルタル構造物の施工
方法は、焼成フェライトの廃材を細かく破砕したものを
細骨材の全て、或いは一部に使用し、この細骨材及びセ
メントの主混合物に水を加えて練ったモルタルで構造物
を施工する方法である。In order to achieve the above object, a method for constructing a radiation shielding mortar structure according to claim 1 is a method for constructing a fine crushed waste ferrite waste material, wherein the fine crushed waste material is all or fine aggregate. This is a method in which a part is used and a structure is constructed with mortar kneaded by adding water to the main mixture of fine aggregate and cement.
【０００６】また、請求項２記載の放射線遮蔽用コンク
リート構造物の施行方法は、焼成フェライトの廃材を細
かく破砕したものを粗骨材、細骨材の全て、或いは一部
に使用し、これら粗骨材、細骨材及びセメントの主混合
物に水を加えて練ったコンクリートで構造物を施工する
方法である。また、請求項３記載の発明は、請求項２記
載の放射線遮蔽用コンクリート構造物の施行方法におい
て、建物の解体によって生じたコンクリート廃材又はモ
ルタル廃材を加工してなる再生骨材を、前記粗骨材の全
て、或いは一部に使用した方法である。According to a second aspect of the present invention, there is provided a method for implementing a concrete structure for radiation shielding, wherein finely crushed waste of fired ferrite is used for all or a part of coarse aggregate and fine aggregate. This is a method of constructing a structure with concrete kneaded by adding water to a main mixture of aggregate, fine aggregate and cement. According to a third aspect of the present invention, in the method for constructing a radiation-shielding concrete structure according to the second aspect, the recycled aggregate formed by processing concrete waste or mortar waste generated by demolishing a building is provided with the coarse bone. This is the method used for all or part of the material.
【０００７】[0007]
【発明の実施の形態】以下、本発明の放射線遮蔽用モル
タル構造物の施工方法及び放射線遮蔽用コンクリート構
造物の施工方法について、図面を参照して説明する。図
１は、本発明に係る第１実施形態の放射線遮蔽用モルタ
ル構造物の製造方法を示すものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for constructing a radiation shielding mortar structure and a method for constructing a radiation shielding concrete structure according to the present invention will be described below with reference to the drawings. FIG. 1 shows a method of manufacturing a radiation shielding mortar structure according to a first embodiment of the present invention.
【０００８】本実施形態では、テレビ、パソコン、その
他の電化製品や電子機器の部品として利用した焼成フェ
ライトの廃材２を使用している。この焼成フェライトの
廃材２は、細かく破砕され、細骨材４として生成されて
いる。この焼成フェライトの廃材２からなる細骨材４
は、比重が4.5 〜5.0 程度であり、従来より使用されて
いる砂等の細骨材の比重と比較して２倍程度大きい。In this embodiment, a waste material 2 of fired ferrite used as a component of a television, a personal computer, other electric appliances or electronic equipment is used. The waste material 2 of the fired ferrite is finely crushed and produced as fine aggregate 4. Fine aggregate 4 composed of waste material 2 of this fired ferrite 4
Has a specific gravity of about 4.5 to 5.0, which is about twice as large as that of fine aggregate such as sand conventionally used.
【０００９】この細骨材４と、セメント６とを所定の比
率で混ぜ合わせ、さらに混和材料８を適宜添加して混ぜ
合わせる。そして、これらに所定量の水１０を加えて混
練することによりモルタル１２を生成している。なお、
セメント６としては、普通ポルトランドセメント、フラ
イアッシュセメント等が使用されており、このセメント
６及び細骨材４を、本発明では主混合物と呼んでいる。
また、前述した混和材料８は、例えば、ＡＥ材、分散
材、凝結・硬化促進材、防水材、防凍材、発泡材、着色
材、混合材、耐火性促進材などである。[0009] The fine aggregate 4 and the cement 6 are mixed at a predetermined ratio, and the admixture 8 is appropriately added and mixed. The mortar 12 is formed by adding a predetermined amount of water 10 to these and kneading them. In addition,
As the cement 6, portland cement, fly ash cement or the like is used, and the cement 6 and the fine aggregate 4 are referred to as a main mixture in the present invention.
Further, the above-described admixture material 8 is, for example, an AE material, a dispersing material, a setting / hardening promoting material, a waterproofing material, an antifreezing material, a foaming material, a coloring material, a mixing material, a fire resistance promoting material, and the like.
【００１０】そして、生成したモルタル１２は、原子力
関連施設のコンクリート壁１４の表面に、放射線遮蔽用
モルタル壁（放射線遮蔽用モルタル構造物）１６として
設けられる。この第１実施形態によると、放射線遮蔽用
モルタル壁１６は、焼成フェライトからなる細骨材４を
使用したことで比重が大きい重量モルタル壁となり、壁
厚さをさほど大きくしなくても、放射線に対する遮蔽効
果を十分に確保することができる。The generated mortar 12 is provided as a radiation shielding mortar wall (radiation shielding mortar structure) 16 on the surface of a concrete wall 14 of a nuclear power facility. According to the first embodiment, the radiation shielding mortar wall 16 is a heavy weight mortar wall having a large specific gravity due to the use of the fine aggregate 4 made of fired ferrite. The shielding effect can be sufficiently ensured.
【００１１】また、細骨材４の材料として焼成フェライ
トの廃材２を使用するため、安価に放射線遮蔽用モルタ
ル壁１６を施工することができるとともに、産業廃棄物
の再生利用が可能となり、資源の有効活用を図ることが
できる。なお、本発明の要旨は、この第１実施形態のよ
うに焼成フェライトの廃材２を破砕した細骨材４のみを
使用することを限定するのではなく、焼成フェライトの
廃材２を破砕してなる細骨材４と、従来のように砂等か
らなる細骨材との両者を混合して放射線遮蔽用モルタル
構造物を施工することも含む。Further, since the waste material 2 of fired ferrite is used as the material of the fine aggregate 4, the radiation shielding mortar wall 16 can be constructed at a low cost, and the industrial waste can be recycled and used. Effective utilization can be achieved. Note that the gist of the present invention is not limited to using only the fine aggregate 4 obtained by crushing the waste material 2 of fired ferrite as in the first embodiment, but by crushing the waste material 2 of fired ferrite. It also includes the construction of the radiation shielding mortar structure by mixing both the fine aggregate 4 and the fine aggregate made of sand or the like as in the prior art.
【００１２】次に、図２は、本発明に係る第２実施形態
の放射線遮蔽用コンクリート構造物の製造方法を示すも
のである。なお、図１に示した第１実施形態と同一構成
部分には、同一符号を付してその説明を省略する。本実
施形態では、焼成フェライトの廃材２を破砕して、細骨
材４と、粗骨材１８とを生成している。Next, FIG. 2 shows a method for manufacturing a radiation shielding concrete structure according to a second embodiment of the present invention. Note that the same components as those of the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the fine aggregate 4 and the coarse aggregate 18 are generated by crushing the waste material 2 of fired ferrite.
【００１３】これら細骨材４及び粗骨材１８と、セメン
ト６とを所定の比率で混ぜ合わせ、さらに混和材料８を
適宜添加して混ぜ合わせる。そして、これらに所定量の
水１０を加えて混練することによりコンクリート２０を
生成している。なお、セメント６、細骨材４及び粗骨材
１８を、本発明では主混合物と呼んでいる。そして、生
成したコンクリート２０は、互いに対向配置した型枠２
２、２２の間に打設され、原子力関連施設の放射線遮蔽
用コンクリート壁（放射線遮蔽用コンクリート構造物）
２４として設けられる。なお、図中番号２６は、鉄筋で
ある。The fine aggregate 4 and the coarse aggregate 18 are mixed with the cement 6 at a predetermined ratio, and the admixing material 8 is appropriately added and mixed. The concrete 20 is produced by adding a predetermined amount of water 10 to these and kneading them. In the present invention, the cement 6, the fine aggregate 4, and the coarse aggregate 18 are referred to as a main mixture. Then, the generated concrete 20 is placed in the form 2
Concrete wall for radiation shielding of nuclear facilities related to concrete between 2 and 22 (concrete structure for radiation shielding)
24. In addition, the number 26 in the figure is a reinforcing bar.
【００１４】この第２実施形態によると、放射線遮蔽用
コンクリート壁２４は、焼成フェライトからなる細骨材
４、粗骨材１８を使用したことで比重が大きい重量コン
クリート壁となり、壁厚さをさほど大きくしなくても、
放射線に対する遮蔽効果を十分に確保することができ
る。また、細骨材４、粗骨材１８の材料として焼成フェ
ライトの廃材２を使用するため、安価に放射線遮蔽用コ
ンクリート壁１６を施工することができるとともに、第
１実施形態と同様に、産業廃棄物の再生利用が可能とな
って資源の有効活用を図ることができる。According to the second embodiment, the radiation shielding concrete wall 24 becomes a heavy concrete wall having a large specific gravity due to the use of the fine aggregate 4 and the coarse aggregate 18 made of fired ferrite. Even if you do not make it big
A sufficient shielding effect against radiation can be ensured. Moreover, since the waste material 2 of fired ferrite is used as the material of the fine aggregate 4 and the coarse aggregate 18, the radiation shielding concrete wall 16 can be constructed at a low cost, and the industrial waste can be disposed similarly to the first embodiment. Recycling of goods becomes possible, and effective utilization of resources can be achieved.
【００１５】次に、図３は、本発明に係る第３実施形態
の放射線遮蔽用コンクリート構造物の製造方法を示すも
のである。本実施形態も、図２に示した第２実施形態と
同一構成部分には、同一符号を付してその説明を省略す
る。本実施形態では、焼成フェライトの廃材２を破砕し
てなる細骨材４及び粗骨材１８の他に、建物の解体によ
って生じたコンクリート廃材又はモルタル廃材（以下、
コンクリート又はモルタル廃材と称する）２８を破砕し
てなる再生骨材３０を粗骨材の一部として使用してい
る。Next, FIG. 3 shows a method of manufacturing a concrete structure for radiation shielding according to a third embodiment of the present invention. In this embodiment, the same components as those of the second embodiment shown in FIG. In the present embodiment, in addition to the fine aggregate 4 and the coarse aggregate 18 obtained by crushing the waste material 2 of the fired ferrite, concrete waste material or mortar waste material (hereinafter, referred to as a waste material) generated by dismantling a building.
A recycled aggregate 30 obtained by crushing concrete or mortar waste material 28 is used as a part of the coarse aggregate.
【００１６】これら細骨材４及び粗骨材１８と、粗骨材
としての再生骨材３０と、セメント６とを所定の比率で
混ぜ合わせ、さらに混和材料８を適宜添加して混ぜ合わ
せる。そして、これらに所定量の水１０を加えて混練す
ることによりコンクリート３２を生成している。そし
て、生成したコンクリート３２は、型枠２２、２２の間
に打設され、原子力関連施設の放射線遮蔽用コンクリー
ト壁（放射線遮蔽用コンクリート構造物）３４として設
けられる。The fine aggregate 4 and the coarse aggregate 18, the recycled aggregate 30 as the coarse aggregate, and the cement 6 are mixed at a predetermined ratio, and the mixing material 8 is further added and mixed as appropriate. The concrete 32 is produced by adding a predetermined amount of water 10 to these and kneading them. Then, the generated concrete 32 is poured between the formwork 22 and 22 and provided as a radiation shielding concrete wall (radiation shielding concrete structure) 34 of a nuclear power related facility.
【００１７】この第３実施形態の放射線遮蔽用コンクリ
ート壁３４も、焼成フェライトからなる細骨材４、粗骨
材１８を使用したことで比重が大きい重量コンクリート
壁となり、壁厚さをさほど大きくしなくても、放射線に
対する遮蔽効果を十分に確保することができる。そし
て、細骨材４、粗骨材１８の一部の材料として焼成フェ
ライトの廃材２を使用し、粗骨材の残りの材料としてコ
ンクリート又はモルタル廃材２８を破砕してなる再生骨
材３０を使用するため、さらに安価に放射線遮蔽用コン
クリート壁３４を施工することができ、産業廃棄物の再
生利用が可能となって資源の有効活用を図ることができ
る。The concrete wall 34 for radiation shielding according to the third embodiment is also a heavy concrete wall having a large specific gravity due to the use of the fine aggregate 4 and the coarse aggregate 18 made of fired ferrite. Even without this, a sufficient shielding effect against radiation can be ensured. Recycled aggregate 30 obtained by crushing waste of concrete or mortar 28 is used as waste material 2 of fired ferrite as a partial material of fine aggregate 4 and coarse aggregate 18 and as the remaining material of coarse aggregate. Therefore, the radiation shielding concrete wall 34 can be constructed even more inexpensively, and the industrial waste can be recycled, so that the resources can be effectively used.
【００１８】ここで、コンクリート又はモルタル廃材２
８を破砕してなる再生骨材３０を使用すると、再生骨材
３０は吸水率が高いのでコンクリートの硬化後の強度、
ひび割れの面で懸念があるが、本実施形態では、骨材と
して全て再生骨材３０を使用しているのではなく、吸水
率が大幅に低い焼成フェライトからなる細骨材４、粗骨
材１８も使用しているので、コンクリート壁全体の水分
が少なくなる。したがって、強度が低下せず、ひび割れ
などの問題が生じない放射線遮蔽用コンクリート壁３４
を得ることができる。Here, concrete or mortar waste material 2
When the recycled aggregate 30 obtained by crushing the concrete 8 is used, since the recycled aggregate 30 has a high water absorption, the strength after hardening of the concrete,
Although there is concern about cracking, in this embodiment, not all recycled aggregates 30 are used as aggregates, but fine aggregates 4 and coarse aggregates 18 made of fired ferrite having a significantly low water absorption. The use of water also reduces the water content of the entire concrete wall. Therefore, the radiation shielding concrete wall 34 does not decrease in strength and does not cause problems such as cracks.
Can be obtained.
【００１９】[0019]
【発明の効果】以上説明したように、請求項１記載の放
射線遮蔽用モルタル構造物の施工方法によると、焼成フ
ェライトの廃材を破砕した細骨材を使用したことで比重
が大きい重量モルタル構造物となり、壁厚さをさほど大
きくしなくても、放射線に対する遮蔽効果を十分に確保
することができる。また、細骨材の材料として焼成フェ
ライトの廃材を使用するため、安価に放射線遮蔽用モル
タル構造物を施工することができるとともに、産業廃棄
物の再生利用が可能となり、資源の有効活用を図ること
ができる。As described above, according to the method for constructing a radiation shielding mortar structure according to the first aspect, a heavy mortar structure having a large specific gravity due to the use of fine aggregate obtained by crushing waste material of fired ferrite. Thus, a sufficient shielding effect against radiation can be ensured without increasing the wall thickness. In addition, since waste material of fired ferrite is used as a material for fine aggregate, it is possible to construct a radiation shielding mortar structure at low cost, and it is also possible to recycle industrial waste and to use resources effectively. Can be.
【００２０】また、請求項２記載の放射線遮蔽用コンク
リート構造物の施工方法によると、焼成フェライトから
なる細骨材、粗骨材を使用したことで比重が大きい重量
コンクリート構造物となり、壁厚さをさほど大きくしな
くても、放射線に対する遮蔽効果を十分に確保すること
ができる。また、細骨材、粗骨材の材料として焼成フェ
ライトの廃材を使用するため、安価に放射線遮蔽用コン
クリート構造物を施工することができるとともに、産業
廃棄物の再生利用が可能となって資源の有効活用を図る
ことができる。According to the construction method of the concrete structure for radiation shielding according to the second aspect, a heavy concrete structure having a large specific gravity is obtained by using a fine aggregate and a coarse aggregate made of fired ferrite, and the wall thickness is increased. Can be sufficiently ensured even if is not so large. In addition, since waste material of fired ferrite is used as a material for fine aggregate and coarse aggregate, radiation shielding concrete structures can be constructed at low cost, and industrial waste can be recycled and reused. Effective utilization can be achieved.
【００２１】さらに、請求項３記載の発明は、請求項２
記載の効果を得ることができるとともに、粗骨材の全
て、或いは一部に、建物の解体によって生じたコンクリ
ート廃材又はモルタル廃材を加工した再生骨材を使用し
ているので、さらに安価に放射線遮蔽用コンクリート構
造物を施工することができるとともに、さらに資源の有
効活用を図ることができる。[0021] Further, the invention according to claim 3 is based on claim 2.
The effect described can be obtained, and all or part of the coarse aggregate is made from recycled aggregate processed from concrete or mortar waste generated by the demolition of buildings, so radiation shielding is more inexpensive. Concrete structures can be constructed, and resources can be used more effectively.
【００２２】また、請求項３記載の発明は、吸水率が高
い再生骨材を使用しているが、吸水率が大幅に低い焼成
フェライトも細骨材、粗骨材として使用しているので、
コンクリート構造物全体の水分が少なくなり、強度が低
下せず、ひび割れなどの問題が生じない放射線遮蔽用コ
ンクリート構造物を得ることができる。Further, the invention according to claim 3 uses a recycled aggregate having a high water absorption, but also uses a fired ferrite having a significantly low water absorption as a fine aggregate and a coarse aggregate.
It is possible to obtain a radiation shielding concrete structure in which the water content of the entire concrete structure is reduced, the strength is not reduced, and problems such as cracks do not occur.
【図１】本発明に係る第１実施形態の放射線遮蔽用モル
タル構造物の施工手順を示す図である。FIG. 1 is a view showing a construction procedure of a radiation shielding mortar structure according to a first embodiment of the present invention.
【図２】本発明に係る第２実施形態の放射線遮蔽用コン
クリート構造物の施工手順を示す図である。FIG. 2 is a diagram showing a construction procedure of a radiation shielding concrete structure according to a second embodiment of the present invention.
【図３】本発明に係る第３実施形態の放射線遮蔽用コン
クリート構造物の施工手順を示す図である。FIG. 3 is a view showing a construction procedure of a radiation shielding concrete structure according to a third embodiment of the present invention.
２ 焼成フェライトの廃材 ４ 細骨材 ６ セメント １０ 水 １２ モルタル １６ 放射線遮蔽用モルタル壁（放射線遮蔽用モルタル
構造物） １８ 粗骨材 ２０、３２ コンクリート ２４、３４ 放射線遮蔽用コンクリート壁（放射線遮蔽
用コンクリート構造物） ２８ コンクリート又はモルタル廃材（コンクリート廃
材又は モルタル廃材） ３０ 再生骨材2 Waste material of fired ferrite 4 Fine aggregate 6 Cement 10 Water 12 Mortar 16 Mortar wall for radiation shielding (Mortar structure for radiation shielding) 18 Coarse aggregate 20, 32 Concrete 24, 34 Concrete wall for radiation shielding (Concrete for radiation shielding Structure) 28 Concrete or mortar waste (concrete or mortar waste) 30 Recycled aggregate
Claims (3)
細骨材の全て、或いは一部に使用し、この細骨材及びセ
メントからなる主混合物に水を加えて練ったモルタルで
構造物を施工することを特徴とする放射線遮蔽用モルタ
ル構造物の施工方法。1. A structure in which a crushed ferrite waste material is used for all or a part of fine aggregate, and water is added to a main mixture of the fine aggregate and cement, and a mortar kneaded to construct a structure. A method for constructing a mortar structure for radiation shielding, characterized in that:
粗骨材、細骨材の全て、或いは一部に使用し、これら粗
骨材、細骨材及びセメントの主混合物に水を加えて練っ
たコンクリートで構造物を施工することを特徴とする放
射線遮蔽用コンクリート構造物の施行方法。2. A crushed waste material of calcined ferrite is used for all or a part of coarse aggregate and fine aggregate, and kneaded by adding water to the main mixture of coarse aggregate, fine aggregate and cement. A method for constructing a radiation shielding concrete structure, characterized in that the structure is constructed with damaged concrete.
廃材又はモルタル廃材を加工してなる再生骨材を、前記
粗骨材の全て、或いは一部に使用したことを特徴とする
請求項２記載の放射線遮蔽用コンクリート構造物の施行
方法。3. The radiation according to claim 2, wherein recycled aggregate formed by processing concrete waste or mortar waste generated by demolition of a building is used for all or a part of the coarse aggregate. How to implement a concrete structure for shielding.
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| JP2001064376A JP2002267792A (en) | 2001-03-08 | 2001-03-08 | Construction method of radiation shielding mortar structure and construction method of radiation shielding concrete structure |
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|---|---|---|---|
| JP2001064376A JP2002267792A (en) | 2001-03-08 | 2001-03-08 | Construction method of radiation shielding mortar structure and construction method of radiation shielding concrete structure |
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| JP2006317152A (en) * | 2005-05-10 | 2006-11-24 | Taisei Corp | Reinforced concrete structure |
| CN100366834C (en) * | 2005-09-23 | 2008-02-06 | 关建璋 | Magnetic isolation and insulating fireproof wall plate |
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