JP2006322946A - Water permeability reducing method for radioactive waste disposal facility, and radioactive waste disposal facility - Google Patents

Water permeability reducing method for radioactive waste disposal facility, and radioactive waste disposal facility Download PDF

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JP2006322946A
JP2006322946A JP2006187462A JP2006187462A JP2006322946A JP 2006322946 A JP2006322946 A JP 2006322946A JP 2006187462 A JP2006187462 A JP 2006187462A JP 2006187462 A JP2006187462 A JP 2006187462A JP 2006322946 A JP2006322946 A JP 2006322946A
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waste disposal
disposal facility
radioactive waste
water permeability
concrete structure
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JP3933187B2 (en
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Kazuhiro Konishi
一寛 小西
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Obayashi Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To maintain low water permeability in a structure, by restraining a tensile stress generated in the concrete structure. <P>SOLUTION: A protrusion material comprising steel or the like is projected preliminarily on an inner face of the concrete structure 1 to be integrated with a cement filling material 3, in this radioactive waste disposal facility of filling the cement filling material 3 of high gas permeability and low water permeability into a clearance of radioactive wastes 2 to be solidified integrally, after placing the plurality of radioactive wastes 2 in an inner space of the underground concrete structure 1 having closed cross section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、放射性廃棄物処分施設及びその低透水化方法に関する。   The present invention relates to a radioactive waste disposal facility and a method for reducing water permeability thereof.

廃棄物においては、その種類に応じて性状が多岐に亘るため、その貯蔵方法も種々存在し、実用化されている。このうち、放射性廃棄物の処分施設として、中空円筒形の地下コンクリート構造物がある。この内部に貯蔵する場合、廃棄物定置後に、廃棄物から発生するガスを内部間隙から安全に透過させる高透気性と、地下水の浸入を抑制できる低透水性が要求される材料を充填し、速やかに固形化することが行われている。この高透気性と低透水性のある材料として、無機系のポーラスモルタルなどが挙げられ、これらを充填することで、ガス抜きを行いつつ放射性廃棄物を貯蔵する方法がある。   Since wastes have various properties according to their types, various storage methods exist and are put into practical use. Among these, there is a hollow cylindrical underground concrete structure as a radioactive waste disposal facility. When storing in this interior, after placing the waste, it is filled with a material that requires high air permeability that allows the gas generated from the waste to permeate safely through the internal gap and low water permeability that can suppress the infiltration of groundwater. Solidification is carried out. Examples of the material having high air permeability and low water permeability include inorganic porous mortar, and there is a method of storing radioactive waste while degassing by filling these materials.

しかしながら、この方法では、施工時に充填材に急速な水和熱が発生し、剛性の高いセメント系充填材が熱膨張し、コンクリート構造物に内圧が作用し、引張応力が発生して、ひび割れの要因となる。また、廃棄物から発生するガスの圧力も構造物に内圧として作用し、同じく引張応力が発生し、ひび割れの原因となる。これにより、地下水が存在する場合には、ひび割れを伝って構造物内部に侵入し、水漏れの原因となるといった課題がある。   However, with this method, rapid heat of hydration is generated in the filler during construction, a highly rigid cement filler expands, internal pressure acts on the concrete structure, tensile stress is generated, and cracks occur. It becomes a factor. Moreover, the pressure of the gas generated from the waste also acts as an internal pressure on the structure, similarly generating a tensile stress and causing cracks. Thereby, when groundwater exists, there exists a subject that it penetrates into a structure through a crack and causes water leakage.

本発明は、以上の課題を解決するものであって、その目的は、コンクリート構造物に発生する引張応力を抑制することで、コンクリート構造物の低透水性を維持できるようにした放射性廃棄物処分施設の低透水化方法を提供するものである。   The present invention solves the above problems, and its purpose is to dispose of radioactive waste that can maintain the low water permeability of the concrete structure by suppressing the tensile stress generated in the concrete structure. It provides a low water permeability method for facilities.

以上の目的を達成するため、本発明は、閉断面を有する地下コンクリート構造物の内部空間に複数の放射性廃棄物を定置した後、該廃棄物の間隙に、廃棄物から発生するガスを内部間隙から透過させる程度の高透気性及び地下水の浸入を抑制できる程度の低透水性のあるセメント系充填材を充填して一体的に固化させるようにした放射性廃棄物処分施設において、前記コンクリート構造物の内面に鋼材などからなる突起材を予め突出させ、前記充填材と一体化させることを特徴とするものである。従って、本発明では、充填材が収縮することで突起物を内部に引っ張り、コンクリート構造物を全体として圧縮するので、内部に向けたプレストレスが導入される結果、ガス圧により発生する引張応力を抑制することができる。   In order to achieve the above object, the present invention provides a method in which a plurality of radioactive wastes are placed in an internal space of an underground concrete structure having a closed cross section, and then gas generated from the waste is introduced into the gaps of the wastes. In a radioactive waste disposal facility filled with a cement-based filler having a high air permeability that allows permeation from the ground and a low water permeability that can suppress the infiltration of groundwater, the concrete structure A projecting material made of steel or the like is projected in advance on the inner surface and integrated with the filler. Therefore, in the present invention, the protrusions are pulled inward by compressing the filler, and the concrete structure is compressed as a whole. As a result, the prestress toward the inside is introduced, so that the tensile stress generated by the gas pressure is reduced. Can be suppressed.

本発明による放射性廃棄物処分施設及び放射性廃棄物処分施設の低透水化方法にあっては、外圧を導入し、かつ内圧を抑制することにより、止水欠陥の発生を抑え、コンクリート構造物の低透水性を維持する。   In the radioactive waste disposal facility and the method for reducing water permeability of the radioactive waste disposal facility according to the present invention, by introducing an external pressure and suppressing an internal pressure, the occurrence of a water stop defect is suppressed, and the concrete structure is reduced. Maintain water permeability.

以下、本発明の好ましい実施の形態につき、添付図面を参照して詳細に説明する。図１は、本発明方法を適用した廃棄物処分施設を示すもので、周囲岩盤Ｅ内に構築された中空円筒形の地下コンクリート構造物１からなっており、この構造物１の内部に、例えば立方体に固形化された多数の放射性廃棄物２を縦横マトリックス状に定置し、各廃棄物２の隙間に充填材３を充填する作業を下部から順に繰返すことで構造物１の内部が満たされることにより、施設が閉鎖される。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a waste disposal facility to which the method of the present invention is applied. The waste disposal facility comprises a hollow cylindrical underground concrete structure 1 constructed in a surrounding rock E. A large number of radioactive wastes 2 solidified in a cube are placed in a matrix form, and the inside of the structure 1 is filled by repeating the work of filling the gaps between the wastes 2 with the filler 3 in order from the bottom. Will close the facility.

充填材３としては、例えばポーラスコンクリートのごとく、高透気性と低透水性のあるセメント系充填材が用いられる。加えて本発明方法では、従来と比べて、充填材３に混和される水量は全量がただちに水和反応を生じないような水：セメント比で混練された材料、あるいはモルタル成分の乾燥粉体のまま充填する作業が満杯になるまで繰り返される。   As the filler 3, for example, a cement-type filler having high air permeability and low water permeability, such as porous concrete, is used. In addition, in the method of the present invention, the amount of water mixed in the filler 3 compared to the conventional method is a material kneaded at a water: cement ratio or a dry powder of a mortar component that does not immediately cause a hydration reaction The filling operation is repeated until it is full.

以上の方法における初期状態においては、図２（ａ）に示すように、廃棄物２の発熱により内部が膨張しても（内部膨張圧を矢印図示）、充填材３は未だ十分に硬化しておらず、従ってその外周のコンクリート構造物１に有害な内圧は生じない。また、岩盤Ｅ内の地下水圧がコンクリート構造物１に作用する時には（地下水圧を矢印図示）、充填材３までに浸潤していないため、廃棄物貯蔵部は低剛性であり、図２（ｂ）に示すように、圧縮応力が導入される。   In the initial state in the above method, as shown in FIG. 2 (a), even if the inside expands due to the heat generation of the waste 2 (internal expansion pressure is indicated by an arrow), the filler 3 is still sufficiently cured. Therefore, no harmful internal pressure is generated in the concrete structure 1 on the outer periphery. Further, when the groundwater pressure in the bedrock E acts on the concrete structure 1 (groundwater pressure is shown by an arrow), the waste storage part has low rigidity because it does not infiltrate up to the filler 3, and FIG. ), Compressive stress is introduced.

この状態から経時変化により、構造物１の内部に地下水が内部に順次浸透すると（透水状況を矢印図示）、図２（ｃ）に示すように、周囲から順次充填材３の緩慢な水和反応が生ずる。この際の発熱量は従来に比べて極めて少なく、加えて水和収縮により、構造物には内側に向けたプレストレスが導入され、ひび割れを発生しにくくする。   When groundwater sequentially permeates into the structure 1 due to a change with time from this state (the water permeation state is indicated by an arrow), as shown in FIG. Will occur. The amount of heat generated at this time is extremely small compared to the conventional case, and in addition, due to hydration shrinkage, prestressing toward the inside is introduced into the structure, making it difficult to generate cracks.

なお、構造物１の内側に予め鋼材などの突起材（図示しない）を適宜間隔をおいて複数突出形成しておくことにより（法線方向に突出することが好ましい）、充填材３の硬化にともない、突起材を内側に向けて引っ張り込む力が作用し、構造物１に内側に向くプレストレスが導入されることになる結果、ガス圧により発生する内圧を抑制することができる。   It is to be noted that a plurality of protrusions (not shown) such as steel materials are formed on the inner side of the structure 1 at appropriate intervals in advance (preferably protruding in the normal direction), thereby hardening the filler 3. Along with this, a force for pulling the projection material inwardly acts and prestressing inward toward the structure 1 is introduced. As a result, the internal pressure generated by the gas pressure can be suppressed.

また、構造物１を透過した微小な透水は、充填材３を通過する過程で水和反応に消費され、さらには図２（ｃ）の一部に拡大して示すように、コンクリート打設時に発生した気泡や、水和減量により生じた空隙内３ａに保水されることから、さらに中心側には透水しがたいものとなる。   Further, the minute water permeated through the structure 1 is consumed in the hydration reaction in the process of passing through the filler 3, and as shown in an enlarged view in FIG. Water is retained in the generated bubbles and in the gaps 3a generated by hydration loss, and therefore, it becomes difficult for water to penetrate to the center side.

以上のような地下水の浸潤に伴う充填材の極めて緩慢な水和反応を伴う硬化が完了した後は、高剛性となり、外圧による構造物１の収縮変形が抑制され、ひび割れが発生し難いものとなる。また、その逆に廃棄物２から発生するガスの圧力による引張応力を抑制するものとなるといった優れた効果を奏する。   After the hardening with the extremely slow hydration reaction of the filler due to the infiltration of groundwater as described above is completed, the structure becomes highly rigid, the shrinkage deformation of the structure 1 due to the external pressure is suppressed, and cracks are unlikely to occur. Become. On the contrary, an excellent effect of suppressing the tensile stress due to the pressure of the gas generated from the waste 2 is obtained.

本発明方法を適用した放射性廃棄物処分施設の平断面図である。It is a plane sectional view of a radioactive waste disposal facility to which the method of the present invention is applied. （ａ）〜（ｃ）は同方法における経時変化を示す説明用平面図である。(A)-(c) is a top view for description which shows the time-dependent change in the same method.

符号の説明Explanation of symbols

１ 地下コンクリート構造物
２ 放射性廃棄物
３ セメント系充填材 1 Underground concrete structure 2 Radioactive waste 3 Cement filler

Claims (2)

閉断面を有する地下コンクリート構造物の内部空間に複数の放射性廃棄物を定置した後、該廃棄物の間隙に、廃棄物から発生するガスを内部間隙から透過させる程度の高透気性及び地下水の浸入を抑制できる程度の低透水性のあるセメント系充填材を充填して一体的に固化させるようにした放射性廃棄物処分施設における低透水化方法において、
前記コンクリート構造物の内面に鋼材などからなる突起材を予め突出させ、前記充填材と一体化させることを特徴とする放射性廃棄物処分施設の低透水化方法。 After placing a plurality of radioactive wastes in the internal space of an underground concrete structure having a closed cross section, the gas generated from the waste is permeated into the gaps between the wastes, and the infiltration of groundwater into the gaps. In a low water permeability method in a radioactive waste disposal facility that is made to solidify by filling with a cement-based filler having a low water permeability that can suppress the
A method for reducing water permeability in a radioactive waste disposal facility, wherein a projecting material made of steel or the like is projected in advance on the inner surface of the concrete structure and integrated with the filler. 閉断面を有する地下コンクリート構造物の内部空間に複数の放射性廃棄物を定置し、該廃棄物の間隙に、廃棄物から発生するガスを内部間隙から透過させる程度の高透気性及び地下水の浸入を抑制できる程度の低透水性のあるセメント系充填材を充填して一体的に固化させるようにした放射性廃棄物処分施設において、
前記コンクリート構造物の内面に鋼材などからなる突起材を予め突出させ、前記充填材と一体化させるように構成したことを特徴とする放射性廃棄物処分施設。

A plurality of radioactive wastes are placed in the interior space of underground concrete structures having a closed cross section, and the permeability between the wastes is high enough to allow the gas generated from the wastes to permeate through the internal gaps. In a radioactive waste disposal facility that is made to solidify by filling with cement-based fillers with low water permeability that can be suppressed,
A radioactive waste disposal facility, wherein a projecting material made of steel or the like is projected in advance on the inner surface of the concrete structure and integrated with the filler.

JP2006187462A 2006-07-07 2006-07-07 Low water permeability method for radioactive waste disposal facility, radioactive waste disposal facility Expired - Fee Related JP3933187B2 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008100154A (en) * 2006-10-18 2008-05-01 Shimizu Corp Gas-permeable passage member for reclamation facility and reclamation facility
JP2012132867A (en) * 2010-12-24 2012-07-12 Hazama Corp Method for filling of clearance filler in burial site for radioactive waste

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008100154A (en) * 2006-10-18 2008-05-01 Shimizu Corp Gas-permeable passage member for reclamation facility and reclamation facility
JP2012132867A (en) * 2010-12-24 2012-07-12 Hazama Corp Method for filling of clearance filler in burial site for radioactive waste

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