JP6546849B2 - Buffer for transport container and cask - Google Patents

Buffer for transport container and cask Download PDF

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JP6546849B2
JP6546849B2 JP2015255426A JP2015255426A JP6546849B2 JP 6546849 B2 JP6546849 B2 JP 6546849B2 JP 2015255426 A JP2015255426 A JP 2015255426A JP 2015255426 A JP2015255426 A JP 2015255426A JP 6546849 B2 JP6546849 B2 JP 6546849B2
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hollow cylindrical
transport container
cylindrical body
buffer
casing
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JP2017114564A (en
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健 市橋
健 市橋
秀晃 三井
秀晃 三井
雄一 齋藤
雄一 齋藤
明夫 北田
明夫 北田
宣也 林
宣也 林
健一郎 阿部
健一郎 阿部
将征 金升
将征 金升
勇治 丸山
勇治 丸山
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Mitsubishi Heavy Industries Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Description

本開示は、輸送容器用緩衝体及び該輸送容器用緩衝体を備えたキャスクに関する。   The present disclosure relates to a buffer for a transport container and a cask provided with the buffer for the transport container.

核燃料サイクルの終期にあって燃焼を終え使用できなくなった核燃料集合体、即ち、使用済み核燃料は高放射性物質を含むので、原子力発電所の冷却水ピットで所定期間冷却された後、キャスクに収納され、トラック又は船舶等で再処理施設又は使用済燃料貯蔵施設等に搬送され、貯蔵される。
使用済み核燃料集合体をキャスクに収容する際、バスケットと呼ばれる格子状の構造物に収納される。即ち、バスケットに形成された複数の収納空間に挿入され、輸送中の振動などに対する適切な保持力を発揮できる。 The end of the nuclear fuel cycle, and since the nuclear fuel assembly which has been burned and can not be used, ie, spent nuclear fuel, contains highly radioactive materials, it is stored in the cask after being cooled for a predetermined period in the cooling water pit of the nuclear power plant. , Or transported by a truck or ship to a reprocessing facility or a spent fuel storage facility for storage.
When the spent nuclear fuel assembly is housed in a cask, it is housed in a lattice-like structure called a basket. That is, it can be inserted into a plurality of storage spaces formed in the basket, and can exert an appropriate holding force against vibrations and the like during transportation.

キャスクは円筒形状を有し、落下時などの衝撃を緩和するため、上部及び下部に緩衝体を備える。従来、緩衝体は鋼製ケーシングの内部に衝撃吸収部材として木材を充填したものが用いられている（例えば、特許文献１参照）。
特許文献２には、鋼製ケーシングの内部に金属製又は合成樹脂製の中空球体を充填する緩衝体の構成が開示されている。 The cask has a cylindrical shape and is provided with a buffer at the upper and lower portions in order to reduce the impact when it is dropped or the like. Heretofore, as a shock absorber, a steel casing filled with wood as an impact absorbing member is used (see, for example, Patent Document 1).
Patent Document 2 discloses a configuration of a shock absorber in which hollow spheres made of metal or synthetic resin are filled in a steel casing.

特開２００６−０９０７５３号公報JP, 2006-090753, A 特開２０００−１６８８３９号公報JP 2000-168839 A

キャスク及びその緩衝体は、使用済み核燃料の収納時に使用済み核燃料の崩壊熱により高温状態となる。
キャスク用緩衝体には、高温環境に耐え、かついかなる落下姿勢に対しても安定した緩衝性能を発揮することが求められている。キャスクには放射性物質を収納するための開閉蓋があり、この開閉蓋からの放射性物質の漏れを防止するために、落下時などにキャスクに加わる衝撃を抑える必要がある。
木材を充填した緩衝体では、木材の強度に温度依存性（高温時の強度低下）があるため、緩衝体の複雑化及び大型化を招き重量増加につながるという問題がある。また、木材種によって強度が一義的に決定されるため、設計の自由度がなく、かつ品質を人為的に制御できないため、品質のバラツキを考慮した裕度設計とならざるを得ず、この点でも大型化及び重量増加が避けられない。
特許文献２に開示された緩衝体は、緩衝性能が高い中空球体の製造が容易ではなく高コストになるという問題がある。 When the spent nuclear fuel is stored, the cask and its buffer body become hot due to the decay heat of the spent nuclear fuel.
The cushioning material for casks is required to withstand a high temperature environment and to exhibit stable cushioning performance against any drop posture. The cask has an open / close lid for containing the radioactive substance, and in order to prevent the leakage of the radioactive substance from the open / close lid, it is necessary to suppress the impact applied to the cask at the time of dropping or the like.
In the case of a buffer filled with wood, there is a problem that the strength of the wood is dependent on temperature (the strength decreases at high temperature), and this causes the buffer to be complicated and enlarged, leading to an increase in weight. In addition, since the strength is uniquely determined depending on the type of wood, there is no freedom in design and the quality can not be artificially controlled. However, the increase in size and weight can not be avoided.
The buffer disclosed in Patent Document 2 has a problem that it is not easy to manufacture hollow spheres having high buffer performance, but it is expensive.

上記課題に鑑み、本発明の少なくとも一実施形態は、低コストで緩衝性能が高い輸送容器用緩衝体を実現することを目的とする。   In view of the above-mentioned subject, at least one embodiment of the present invention aims at realizing a buffer for transport containers with low cost and high buffer performance.

（１）本発明の少なくとも一実施形態に係る輸送容器用緩衝体は、
被輸送物を収容可能な輸送容器に装着される輸送容器用緩衝体であって、
内部空間を有するケーシングと、
前記内部空間に充填される衝撃吸収部材と、
を備え、
前記衝撃吸収部材は、複数の繊維強化プラスチック製シートが積層されてなる壁体から構成される複数の中空筒状体を含むとともに、前記複数の中空筒状体が互いに離間するように撓み許容空間を介して並列配置されて形成される。
(1) A buffer for a transport container according to at least one embodiment of the present invention,
A buffer for a transport container mounted on a transport container capable of containing a transported object, comprising:
A casing having an internal space;
An impact absorbing member filled in the internal space;
Equipped with
The impact absorbing member includes a plurality of hollow cylindrical bodies configured by a wall body in which a plurality of fiber reinforced plastic sheets are stacked, and a deflection allowable space such that the plurality of hollow cylindrical bodies are separated from each other Are formed in parallel via

ここで、上記中空筒状体とは、内部空間をもつ筒形状の構造物をすべて含み、特に壁体の一部にスリット、孔等が形成されているものも含むものとする。
上記構成（１）によれば、並列に配置された上記中空筒状体に衝撃（荷重）が加わると、中空筒状体の撓みにより中空筒状体の壁体を構成する複数の繊維強化プラスチック製シート（以下「ＦＲＰシート」とも言う。）のシート間で剥離破壊が起る。この剥離破壊の過程で衝撃を吸収するため、輸送容器への衝撃を緩和できる。
また、木材を用いないため、木材の課題である高温時の緩衝性能低下を解消でき、かつＦＲＰシートは工業製品であり、品質のバラツキを制御することができるため、裕度設計を最小限に抑えることができ、これによって、緩衝体を小型化かつ低コスト化できる。
また、ＦＲＰシートの積層数及び中空筒状体の外径を変えることで、中空筒状体の圧縮強度を制御できる。例えば、積層数を多くすれば高強度となり、外径を大きくすれば低強度となる。これによって、輸送容器の仕様及び付加荷重に応じた緩衝体の最適配置が木材と比べ容易になる。 Here, the above-mentioned hollow cylindrical body includes all cylindrical structures having an internal space, and in particular, includes a structure in which a slit, a hole or the like is formed in a part of a wall body.
According to the above configuration (1), when an impact (load) is applied to the hollow cylindrical bodies arranged in parallel, a plurality of fiber reinforced plastics constituting the wall of the hollow cylindrical body by the deflection of the hollow cylindrical body Peeling failure occurs between the sheets of the sheet (hereinafter also referred to as "FRP sheet"). Since the impact is absorbed in the process of the peeling failure, the impact on the transport container can be relaxed.
In addition, since no wood is used, it is possible to eliminate the decrease in shock absorbing performance at high temperatures, which is a problem of wood, and FRP sheet is an industrial product and can control variations in quality, thus minimizing design for margin. This can reduce the size and cost of the buffer.
Further, the compressive strength of the hollow cylindrical body can be controlled by changing the number of laminated FRP sheets and the outer diameter of the hollow cylindrical body. For example, increasing the number of laminations results in high strength, and increasing the outer diameter results in low strength. This facilitates the optimal placement of the buffer according to the specifications of the transport container and the applied load compared to wood.

（２）幾つかの実施形態では、前記構成（１）において、
前記複数の中空筒状体は、前記ケーシングの外面のうち前記輸送容器に対向しない面の少なくとも１つに対して軸方向が略垂直になるように配置されている。
撓み許容空間を介して並列に配置された中空筒状体に対して軸方向から荷重が加わると、中空筒状体は軸方向の縮みで荷重を吸収しつつ、軸方向と交差する方向に撓む。この撓みにより、ＦＲＰシート間の剥離破壊が起り、この剥離破壊の過程で荷重を吸収する。
上記構成（２）によれば、輸送容器の落下時などに輸送容器に加わる複数方向の荷重の少なくとも１つは中空筒状体に対して軸方向から加わるので、中空筒状体の衝撃吸収効果を最大限に発揮させることができる。 (2) In some embodiments, in the configuration (1),
The plurality of hollow cylindrical bodies are arranged such that the axial direction is substantially perpendicular to at least one of the surfaces of the outer surface of the casing not facing the transport container.
When a load is applied from the axial direction to the hollow cylindrical bodies arranged in parallel via the deflection allowable space, the hollow cylindrical body is bent in the direction intersecting the axial direction while absorbing the load by axial contraction. Well. Due to this deflection, peeling failure occurs between the FRP sheets, and the load is absorbed in the process of the peeling failure.
According to the above configuration (2), at least one of the loads in the plurality of directions applied to the transport container when the transport container falls or the like is applied from the axial direction to the hollow tubular body, so the shock absorbing effect of the hollow tubular body Can make the most of

（３）幾つかの実施形態では、前記構成（１）又は（２）において、
前記複数の中空筒状体は、
第１の方向に沿って配列される第１のグループと、
前記第１の方向に交差する第２の方向に沿って配列される第２のグループと、
を含む。
輸送容器の転倒時や落下時等には、落下姿勢などによって緩衝体には必ずしも一方向の荷重ではなく複数方向の荷重が付加される。また、緩衝体の部位によって加わる荷重の方向及び大きさが異なる。
上記構成（３）によれば、上記第１のグループと上記第２のグループとで、中空筒状体の軸方向を異なる方向に配置することで、輸送容器に加わる荷重を中空筒状体の軸方向へ付加させる確率を高め、これによって、中空筒状体の衝撃吸収性能を確実に発揮させることができる。
上記構成（３）では、第１のグループ及び第２のグループの中空筒状体と軸方向を異にする第３のグループを設けることを排除しない。 (3) In some embodiments, in the configuration (1) or (2),
The plurality of hollow cylindrical bodies are
A first group arranged along a first direction;
A second group arranged along a second direction intersecting the first direction;
including.
When the transport container falls or falls, not only a load in one direction but a load in a plurality of directions is applied to the buffer depending on the dropping posture or the like. In addition, the direction and the magnitude of the load applied differ depending on the portion of the buffer.
According to the configuration (3), by arranging the axial directions of the hollow cylindrical body in different directions in the first group and the second group, the load applied to the transport container can be reduced It is possible to increase the probability of the addition in the axial direction, and to reliably exhibit the impact absorption performance of the hollow cylindrical body.
In the above configuration (3), the provision of the third group having an axial direction different from that of the hollow cylindrical members of the first group and the second group is not excluded.

（４）幾つかの実施形態では、前記構成（３）において、
前記輸送容器は略円柱形状を有し、
前記ケーシングは前記輸送容器の端部に嵌入可能な凹部を有し、
前記第１のグループは軸方向端面が前記略円柱形状の端面に対向するように配列された前記中空筒状体であり、
前記第２のグループは軸方向端面が前記略円柱形状の周面に対向するように配置された
前記中空筒状体である。
輸送容器の軸方向端面に対向する緩衝体の部位では、落下時などに輸送容器の軸方向の衝撃が加わる確率が高く、輸送容器の周方向に対向する緩衝体の部位では、落下時などに輸送容器の半径方向の衝撃（荷重）が加わる確率が高い。
上記構成（４）によれば、中空筒状体の軸方向を付加される確率が高い衝撃の方向に合わせて配置することで、衝撃吸収性能を確実に発揮できる。 (4) In some embodiments, in the configuration (3),
The transport container has a substantially cylindrical shape,
The casing has a recess which can be fitted into the end of the transport container,
The first group is the hollow cylindrical body arranged so that an axial end face faces the end face of the substantially cylindrical shape,
The second group is the hollow cylindrical body disposed such that an axial end surface thereof faces the circumferential surface of the substantially cylindrical shape.
In the region of the buffer facing the end face in the axial direction of the transport container, there is a high probability that an impact in the axial direction of the transport container is applied when falling etc., and in the region of the buffer facing in the circumferential direction of the transport container There is a high probability that a radial impact (load) of the transport container will be applied.
According to the above configuration (4), the shock absorbing performance can be reliably exhibited by arranging the hollow cylindrical body in the direction of impact with high probability of being added in the axial direction.

（５）幾つかの実施形態では、前記方法（１）〜（４）の何れかにおいて、
前記中空筒状体は、前記壁体が周方向全周に亘って形成されたパイプ形状を有する。
ここで、「壁体が周方向全周に亘って形成されたパイプ形状」とは壁体（隔壁）にスリットや孔等を有さない筒状の構造物を言う。
上記構成（５）によれば、中空筒状体を上記構成とすることで、中空筒状体の全周に亘りＦＲＰシート間で剥離破壊が起るため、衝撃吸収効果をさらに高めることができる。 (5) In some embodiments, in any of the methods (1)-(4),
The hollow cylindrical body has a pipe shape in which the wall body is formed along the entire circumferential direction.
Here, the “pipe shape in which the wall is formed along the entire circumferential direction” refers to a tubular structure having no slit, hole or the like in the wall (partition).
According to the above configuration (5), by making the hollow cylindrical body into the above-described structure, since the peel fracture occurs between the FRP sheets over the entire circumference of the hollow cylindrical body, the shock absorbing effect can be further enhanced. .

（６）幾つかの実施形態では、前記方法（１）〜（５）の何れかにおいて、
前記中空筒状体は、前記壁体が互いに交差する方向に配置された複数の板状部材が組み合わされて構成される。
例えば、矩形の板状部材の両縁に一定間隔をもって切込部を設けると共に、前記切込部同士を互いに差し込むように前記板状部材を直交して交互に積み重ねて構成される。
上記構成（６）によれば、中空筒状体を低コストで製造できる。 (6) In some embodiments, in any of the above methods (1)-(5),
The hollow cylindrical body is configured by combining a plurality of plate-like members arranged in the direction in which the wall bodies intersect with each other.
For example, while providing a cut part at fixed intervals in the both edges of a rectangular plate-like member, the plate-like members are alternately stacked orthogonally so that the cut parts are inserted into each other.
According to the above configuration (6), the hollow cylindrical body can be manufactured at low cost.

（７）幾つかの実施形態では、前記構成（１）〜（６）の何れかにおいて、
前記中空筒状体の内部又は前記撓み許容空間の少なくとも一方に充填される木材又は発泡材で構成された充填物をさらに備える。
上記構成（７）によれば、中空筒状体の内部又は撓み許容空間に木材又は発泡材で構成された充填物を充填することで、中空筒状体の剛性や撓み度の調整が可能になり、緩衝体の剛性及び衝撃吸収性能をキャスクの用途に合った最適な条件に調整できる。
また、木材又は発泡材で構成された充填物を撓み許容空間に充填することで、中空筒状体の位置固定を容易に行うことができる。 (7) In some embodiments, in any of the above configurations (1) to (6),
It further comprises a filling made of wood or foam filled in at least one of the inside of the hollow cylindrical body or the deflection allowance space.
According to the above configuration (7), by filling the filling made of wood or foam in the interior of the hollow cylindrical body or the bending allowance space, the rigidity and the degree of bending of the hollow cylindrical body can be adjusted. Thus, the rigidity and shock absorption performance of the shock absorber can be adjusted to the optimum conditions for the application of the cask.
In addition, the hollow cylindrical body can be easily fixed in position by filling the space made of wood or a foam into the flexure-allowed space.

（８）幾つかの実施形態では、前記構成（４）において、
前記ケーシングの凹部の内側面に前記輸送容器の周方向に間隔をおいて設けられた複数の補強リブをさらに備え、
前記複数の補強リブの間に前記中空筒状体が配置される。
上記構成（８）によれば、上記補強リブを設けることで、荷重負荷時の緩衝材の位置ずれ及びすべり等を防止でき、緩衝材の衝撃吸収性能を十分に発揮することができる。 (8) In some embodiments, in the configuration (4),
The inner surface of the recess of the casing further comprises a plurality of reinforcing ribs provided at intervals in the circumferential direction of the transport container,
The hollow cylindrical body is disposed between the plurality of reinforcing ribs.
According to the above configuration (8), by providing the reinforcing rib, it is possible to prevent the displacement and slippage of the shock absorbing material at the time of load application, and the shock absorbing performance of the shock absorbing material can be sufficiently exhibited.

（９）幾つかの実施形態では、前記構成（１）〜（８）の何れかにおいて、
前記ケーシングが繊維強化プラスチック材で構成される。
上記構成（９）によれば、緩衝体をさらに軽量化及び高強度化できる。 (9) In some embodiments, in any of the above configurations (1) to (8),
The casing is made of a fiber reinforced plastic material.
According to the above configuration (9), the buffer can be further reduced in weight and strength.

（１０）本発明の幾つかの実施形態に係るキャスクは、
内部に放射性物質を収容する筒状の輸送容器と、
上記構成（１）〜（９）の何れかの緩衝体と、
を備える。
上記構成（１０）によれば、上記構成（１）〜（９）の緩衝体を備えることで、木材の課題である高温時の緩衝性能低下を解消でき、かつ品質のバラツキを制御することができるため、裕度設計を最小限に抑えることができ、これによって、緩衝体を小型化かつ低コスト化できる。
また、中空筒状体の撓み及びＦＲＰシートのシート間に起こる剥離破壊によって衝撃吸収性能を高めることができる。
また、ＦＲＰシートの積層数及び中空筒状体の外径を変えることで、中空筒状体の圧縮強度を制御でき、これによって、付加荷重に応じた緩衝体の最適配置が木材と比べ容易になる。 (10) The cask according to some embodiments of the present invention,
A cylindrical transport container containing radioactive material inside;
The buffer according to any one of the above configurations (1) to (9);
Equipped with
According to the above configuration (10), by providing the buffer of the above configurations (1) to (9), it is possible to eliminate the decrease in buffer performance at high temperature which is a problem of wood and to control the variation in quality. Because the capacity design can be minimized, the buffer can be miniaturized and the cost can be reduced.
In addition, the impact absorbing performance can be enhanced by the deflection of the hollow cylindrical body and the peeling failure occurring between the sheets of the FRP sheet.
In addition, the compressive strength of the hollow cylindrical body can be controlled by changing the number of laminated FRP sheets and the outer diameter of the hollow cylindrical body, whereby the optimum arrangement of the shock absorber according to the applied load can be made easier than wood. Become.

本発明の少なくとも一実施形態によれば、輸送容器、特に放射性物質を収容するキャスク用緩衝体において、小型化及び低コスト化が可能で、かつ落下時などにおける衝撃吸収性能を向上できる。   According to at least one embodiment of the present invention, it is possible to miniaturize and reduce the cost of a transport container, in particular a cask buffer containing a radioactive substance, and to improve shock absorbing performance when dropped or the like.

一実施形態に係る輸送容器用緩衝体を装着した輸送容器の正面図である。It is a front view of the transport container equipped with the buffer for transport containers concerning one embodiment. 一実施形態に係る輸送容器用緩衝体の正面視断面図である。It is a plain view sectional drawing of the buffer for transport containers which concerns on one Embodiment. 図２中のＡ―Ａ線に沿う断面図である。FIG. 3 is a cross-sectional view taken along the line AA in FIG. 一実施形態に係る輸送容器用緩衝体の正面視断面図である。It is a plain view sectional drawing of the buffer for transport containers which concerns on one Embodiment. 一実施形態に係る輸送容器用緩衝体の側面図である。It is a side view of the buffer for transport containers concerning one embodiment. 一実施形態に係る中空筒状体の斜視図である。It is a perspective view of the hollow cylindrical body which concerns on one Embodiment. 一実施形態に係る中空筒状体の斜視図である。It is a perspective view of the hollow cylindrical body which concerns on one Embodiment. 一実施形態に係る中空筒状体の圧縮強度を示す線図である。It is a diagram which shows the compressive strength of the hollow cylindrical body which concerns on one Embodiment. 一実施形態に係る中空筒状体の圧縮強度を示す線図である。It is a diagram which shows the compressive strength of the hollow cylindrical body which concerns on one Embodiment. 一実施形態に係る中空筒状体の圧縮強度を示す線図である。It is a diagram which shows the compressive strength of the hollow cylindrical body which concerns on one Embodiment. 一実施形態に係る中空筒状体の斜視図である。It is a perspective view of the hollow cylindrical body which concerns on one Embodiment. 一実施形態に係る衝撃吸収部材の断面側面図である。It is a cross-sectional side view of the impact-absorbing member which concerns on one Embodiment. 一実施形態に係る衝撃吸収部材の断面側面図である。It is a cross-sectional side view of the impact-absorbing member which concerns on one Embodiment. 一実施形態に係る輸送容器用緩衝体の別な用途を示す説明図である。It is explanatory drawing which shows the other use of the buffer for transport containers which concerns on one Embodiment. 一実施形態に係る輸送容器用緩衝体の他の用途を示す説明図である。It is explanatory drawing which shows the other use of the buffer for transport containers which concerns on one Embodiment.

以下、添付図面を参照して本発明の幾つかの実施形態について説明する。ただし、実施形態として記載され又は図面に示されている構成部品の寸法、材質、形状、その相対的配置等は、本発明の範囲をこれに限定する趣旨ではなく、単なる説明例にすぎない。
例えば、「ある方向に」、「ある方向に沿って」、「平行」、「直交」、「中心」、「同心」或いは「同軸」等の相対的或いは絶対的な配置を表す表現は、厳密にそのような配置を表すのみならず、公差、若しくは、同じ機能が得られる程度の角度や距離をもって相対的に変位している状態も表すものとする。
例えば、「同一」、「等しい」及び「均質」等の物事が等しい状態であることを表す表現は、厳密に等しい状態を表すのみならず、公差、若しくは、同じ機能が得られる程度の差が存在している状態も表すものとする。
例えば、四角形状や円筒形状等の形状を表す表現は、幾何学的に厳密な意味での四角形状や円筒形状等の形状を表すのみならず、同じ効果が得られる範囲で、凹凸部や面取り部等を含む形状も表すものとする。
一方、一つの構成要素を「備える」、「具える」、「具備する」、「含む」、又は「有する」という表現は、他の構成要素の存在を除外する排他的な表現ではない。 Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements and the like of the components described as the embodiments or shown in the drawings are not intended to limit the scope of the present invention to these, but are merely illustrative examples.
For example, a representation representing a relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” is strictly Not only does it represent such an arrangement, but also represents a state of relative displacement with an angle or distance that allows the same function to be obtained.
For example, expressions that indicate that things such as "identical", "equal" and "homogeneous" are equal states not only represent strictly equal states, but also have tolerances or differences with which the same function can be obtained. It also represents the existing state.
For example, expressions representing shapes such as quadrilateral shapes and cylindrical shapes not only represent shapes such as rectangular shapes and cylindrical shapes in a geometrically strict sense, but also uneven portions and chamfers within the range where the same effect can be obtained. The shape including a part etc. shall also be expressed.
On the other hand, the expressions "comprising", "having", "having", "including" or "having" one component are not exclusive expressions excluding the presence of other components.

本発明の幾つかの実施形態に係る輸送容器用緩衝体１０は、図１に示すように、輸送容器１２を収容可能な輸送容器１２に装着される緩衝体である。
例示的な実施形態では、輸送容器１２は、有底筒状の輸送容器本体１４と、被輸送物１５を出し入れするための開閉蓋１８とで構成される。
例示的な実施形態では、輸送容器１２は、内部に被輸送物１５として使用済み核燃料などの放射性物質を収容する筒状の外形を有するキャスクである。
図示した実施形態では、輸送容器１２は円筒形の形状をしたキャスクである。
図１中、矢印ａ方向は輸送容器１２の軸方向を示し、矢印ｂ方向は輸送容器１２の半径方向を示す。 The transport container shock absorber 10 according to some embodiments of the present invention is a shock absorber attached to a transport container 12 capable of containing the transport container 12 as shown in FIG. 1.
In the exemplary embodiment, the transport container 12 is configured of a bottomed cylindrical transport container body 14 and an open / close lid 18 for taking in and out the transported object 15.
In the exemplary embodiment, the transport container 12 is a cask having a tubular outer shape that contains radioactive material such as spent nuclear fuel as the transported object 15 therein.
In the illustrated embodiment, the transport container 12 is a cylindrically shaped cask.
In FIG. 1, the arrow a direction indicates the axial direction of the transport container 12, and the arrow b direction indicates the radial direction of the transport container 12.

緩衝体１０は外郭を形成するケーシング１６を備え、ケーシング１６は輸送容器１２の端部が嵌入される凹部１６ａを有している。また、ケーシング１６は衝撃吸収部材２０が充填される内部空間ｓを有する。
衝撃吸収部材２０は、図２〜図４に示すように、並列に配置された多数の中空筒状体２２で構成される。
中空筒状体２２（２２Ａ、２２Ｂ、２２Ｃ）は、図６及び図７に示すように、複数のＦＲＰシート２４が積層されて構成された壁体を有し、図３に示すように、各中空筒状体間に撓み許容空間Ｓｃが形成されると共に、内部空間Ｓｉをもつ中空筒形の構造体である。
なお、中空筒状体２２は、内部空間Ｓｉをもつ筒形状の構造体をすべて含み、特に、壁体の一部にスリット、孔等が形成されているものも含むものとする。 The shock absorber 10 comprises a casing 16 forming an outer shell, and the casing 16 has a recess 16a into which the end of the transport container 12 is fitted. In addition, the casing 16 has an internal space s in which the shock absorbing member 20 is filled.
The impact-absorbing member 20 is comprised by many hollow cylindrical bodies 22 arrange | positioned in parallel, as shown to FIGS.
The hollow cylindrical body 22 (22A, 22B, 22C) has a wall body formed by laminating a plurality of FRP sheets 24 as shown in FIGS. 6 and 7, and as shown in FIG. It is a hollow cylindrical structure having an inner space Si as well as a deflection allowable space Sc formed between the hollow cylindrical bodies.
In addition, the hollow cylindrical body 22 includes all of the cylindrical structure having the internal space Si, and in particular, includes a structure in which a slit, a hole or the like is formed in a part of the wall body.

図示した実施形態では、図５に示すように、緩衝体１０は外形が円形であり、ケーシング１６に取付け用のボルト穴３０が形成されている。
例示的な実施形態では、図６に示すように、中空筒状体２２（２２Ａ）は壁面が円形であり、図７に示す中空筒状体２２（２２Ｂ）は壁面が矩形である。
ＦＲＰシート２４は、例えば、ＣＦＲＰ、ＧＦＲＰ等で構成される。また、ＦＲＰシート２４は、例えば、繊維が２方向に交差するように配置され織布を形成する。 In the illustrated embodiment, as shown in FIG. 5, the shock absorber 10 has a circular outer shape, and a bolt hole 30 for attachment is formed in the casing 16.
In an exemplary embodiment, as shown in FIG. 6, the hollow cylindrical body 22 (22A) has a circular wall surface, and the hollow cylindrical body 22 (22B) shown in FIG. 7 has a rectangular wall surface.
The FRP sheet 24 is made of, for example, CFRP, GFRP or the like. Further, the FRP sheet 24 is, for example, arranged so that fibers cross in two directions to form a woven fabric.

輸送容器１２の転倒時や落下時等に、緩衝体１０に衝撃又は荷重が加わると、中空筒状体２２の撓みにより、ＦＲＰシート２４の各シート間で剥離破壊が起り、この剥離破壊の過程で衝撃を吸収するため、輸送容器１２への衝撃を緩和できる。   When shock or load is applied to the shock absorber 10 when the transport container 12 falls or falls, the hollow cylindrical body 22 is flexed to cause peel fracture between the sheets of the FRP sheet 24, and the process of this peel fracture To absorb the impact, the impact on the transport container 12 can be mitigated.

緩衝体１０（１０Ａ、１０Ｂ）には、落下時の姿勢によって複数の異なる方向の荷重が加わる。また、緩衝体１０の部位によって加わる荷重の方向及び大きさが異なる。
例えば、図２及び図４に示すように、輸送容器１２の軸方向端面に対向する端面部位Ｐａでは輸送容器１２の軸方向に沿う荷重Ｆａが加わり、輸送容器１２の周面に対向する周面部位Ｐｒには輸送容器１２の半径方向に沿う荷重Ｆｒが加わる。また、角部Ｐｔには輸送容器１２の軸方向に対して斜め方向の荷重Ｆｔが加わる。 A plurality of loads in different directions are applied to the buffer 10 (10A, 10B) depending on the posture when dropped. Moreover, the direction and magnitude of the load applied differ depending on the portion of the buffer 10.
For example, as shown in FIG. 2 and FIG. 4, a load Fa along the axial direction of the transport container 12 is applied to the end surface site Pa opposed to the axial end surface of the transport container 12, and a circumferential surface facing the circumferential surface of the transport container 12 A load Fr along the radial direction of the transport container 12 is applied to the portion Pr. Further, a load Ft diagonal to the axial direction of the transport container 12 is applied to the corner portion Pt.

例示的な実施形態では、複数の中空筒状体２２は、ケーシング１６の外面のうち輸送容器１２に対向しない面の少なくとも１つに対して軸方向が略垂直になるように配置されている。このように中空筒状体２２を配置すると、撓み許容空間Ｓｃを介して並列に配置された複数の中空筒状体２２に対して軸方向から荷重が加わり、中空筒状体２２は軸方向の縮みで荷重を吸収しつつ、軸方向と交差する方向に撓む。この撓みにより、ＦＲＰシート２４間の剥離破壊が起り、この剥離破壊の過程で荷重を吸収する。
中空筒状体２２を上記のように配置することで、輸送容器１２の落下時などに、輸送容器１２に加わる複数方向の荷重の少なくとも１つは中空筒状体２２に対して軸方向から加わる。これによって、中空筒状体２２の衝撃吸収効果を最大限に発揮できる。 In the exemplary embodiment, the plurality of hollow cylindrical bodies 22 are arranged such that the axial direction is substantially perpendicular to at least one of the outer surfaces of the casing 16 not facing the transport container 12. When the hollow cylindrical body 22 is disposed in this manner, a load is applied from the axial direction to the plurality of hollow cylindrical bodies 22 arranged in parallel via the deflection allowable space Sc, and the hollow cylindrical body 22 is axially It bends in the direction intersecting with the axial direction while absorbing the load by shrinkage. Due to this bending, peeling failure occurs between the FRP sheets 24, and the load is absorbed in the process of the peeling failure.
By arranging the hollow cylindrical body 22 as described above, at least one of the loads applied to the transport container 12 in the axial direction is applied to the hollow cylindrical body 22 when the transport container 12 is dropped or the like. . Thereby, the impact absorbing effect of the hollow cylindrical body 22 can be maximized.

例示的な実施形態では、複数の中空筒状体２２は、図２及び図４に示すように、第１の方向に沿って配列される第１のグループＰａと、第１の方向に交差する第２の方向に沿って配列される第２のグループＰｒとを含む。
このように、第１のグループＰａと第２のグループＰｒとで、中空筒状体２２の軸方向の配置を異ならせることで、中空筒状体２２の軸方向を輸送容器１２に加わる荷重に沿わせる確率を高め、これによって、中空筒状体２２の衝撃吸収性能を確実に発揮できる。 In the exemplary embodiment, the plurality of hollow cylinders 22 intersect the first direction with the first group Pa arranged along the first direction, as shown in FIGS. 2 and 4. And a second group Pr arranged along the second direction.
As described above, the axial direction of the hollow cylindrical body 22 is different between the first group Pa and the second group Pr, so that the axial direction of the hollow cylindrical body 22 is the load applied to the transport container 12. The probability that the hollow cylindrical body 22 is fitted can be increased, and the impact absorption performance of the hollow cylindrical body 22 can be reliably exhibited.

例示的な実施形態では、図１に示すように、輸送容器１２は略円柱形状を有し、ケーシング１６は輸送容器１２の軸方向端部に輸送容器１２を嵌入可能な凹部１６ａを有する。
そして、第１のグループＰａは、軸方向端面が輸送容器１２の軸方向端面に対向するように配列された中空筒状体で構成され、第２のグループＰｒは軸方向端面が輸送容器１２の周面に対向するように配置された中空筒状体で構成される。
図２及び図４に示すように、輸送容器１２の軸方向端面には、落下時などに輸送容器１２の軸方向の荷重Ｆａが加わる確率が高く、輸送容器１２の周面には輸送容器１２の半径方向の荷重Ｆｒが加わる確率が高い。
従って、第１のグループＰａ及び第２のグループＰｒのように中空筒状体２２を配置することで、第１のグループＰａ及び第２のグループＰｒの中空筒状体２２の軸方向を付加される荷重Ｆａ及びＦｒに沿わせることができ、これによって、良好な衝撃吸収性能を確実に発揮できる。 In the exemplary embodiment, as shown in FIG. 1, the transport container 12 has a substantially cylindrical shape, and the casing 16 has a recess 16 a into which the transport container 12 can be inserted at an axial end of the transport container 12.
The first group Pa is formed of a hollow cylindrical body arranged so that the axial end face faces the axial end face of the transport container 12, and the second group Pr is an axial end face of the transport container 12. It is comprised by the hollow cylindrical body arrange | positioned so as to oppose a surrounding surface.
As shown in FIGS. 2 and 4, the axial end face of the transport container 12 has a high probability that an axial load Fa of the transport container 12 is applied when it is dropped, etc., and the transport container 12 has a circumferential surface There is a high probability that the radial load Fr of is applied.
Therefore, by disposing the hollow cylindrical body 22 as in the first group Pa and the second group Pr, the axial direction of the hollow cylindrical body 22 of the first group Pa and the second group Pr is added. The load Fa and Fr can be made to meet, and by this, good shock absorbing performance can be reliably exhibited.

なお、緩衝体１０（１０Ａ、１０Ｂ）の角部Ｐｔに設けられる中空筒状体２２は、状況に応じて適宜方向に配置される。
図示した実施形態では、図２に示す緩衝体１０（１０Ａ）の角部Ｐｔでは、中空筒状体２２の軸方向は輸送容器１２の軸方向に沿うように配置され、図４に示す緩衝体１０（１０Ｂ）の角部Ｐｔでは、中空筒状体２２の軸方向は輸送容器１２の半径方向に沿うように配置される。また、角部Ｐｔに設けられる中空筒状体の配置方向は、図２に示す方向と図４に示す方向を組み合わせてもよい。 In addition, the hollow cylindrical body 22 provided in corner part Pt of buffer 10 (10A, 10B) is arrange | positioned in an appropriate direction according to a condition.
In the illustrated embodiment, at the corner Pt of the shock absorber 10 (10A) shown in FIG. 2, the axial direction of the hollow cylindrical body 22 is disposed along the axial direction of the transport container 12, and the shock absorber shown in FIG. At a corner Pt of 10 (10 B), the axial direction of the hollow cylindrical body 22 is disposed along the radial direction of the transport container 12. Moreover, the arrangement direction of the hollow cylindrical body provided at the corner portion Pt may be a combination of the direction shown in FIG. 2 and the direction shown in FIG.

図８〜図１０は中空筒状体２２に加わる圧縮荷重Ｆと中空筒状体２２の軸方向の剥離破壊量δとの関係を示す。
図８において、ＦＲＰシート２４の積層数を増加させると、図中の破線で示すように、中空筒状体２２の圧縮強度を高めることができる。一方、中空筒状体２２の外径を大きくすると、圧縮強度は低下する。
このように、ＦＲＰシート２４の積層数又は中空筒状体２２の外径を変えることで、中空筒状体２２の圧縮強度を制御できる。なお、中空筒状体２２の軸方向長さは圧縮強度と無関係である。
また、図８に示すように、例えば、中空筒状体２２が圧縮荷重Ｆを受け、軸方向全長が全体の７０〜８０％だけ剥離破壊が進んだときを臨界点Ｃとし、この時の圧縮荷重ＦをＦｏとする。縦軸は中空筒状体２２に加わる圧縮荷重Ｆを示すが、この圧縮荷重Ｆは中空筒状体２２の圧縮強度と等価である。中空筒状体２２は臨界点Ｃを過ぎると圧縮強度は急激に増加し、これ以上軸方向に縮まない性質を有する。図８中、斜線領域Ｅは中空筒状体２２の剥離破壊によって吸収可能な衝撃エネルギ量を示す。 8 to 10 show the relationship between the compressive load F applied to the hollow cylindrical body 22 and the amount of peeling failure δ of the hollow cylindrical body 22 in the axial direction.
In FIG. 8, when the number of laminated FRP sheets 24 is increased, the compressive strength of the hollow cylindrical body 22 can be increased as shown by the broken line in the figure. On the other hand, when the outer diameter of the hollow cylindrical body 22 is increased, the compressive strength is reduced.
Thus, the compressive strength of the hollow cylindrical body 22 can be controlled by changing the number of laminated FRP sheets 24 or the outer diameter of the hollow cylindrical body 22. The axial length of the hollow cylindrical body 22 is irrelevant to the compressive strength.
Also, as shown in FIG. 8, for example, when the hollow cylindrical body 22 receives the compressive load F and the peel length of the entire axial length advances by 70 to 80% of the whole is regarded as the critical point C, and the compression at this time The load F is Fo. The vertical axis represents the compressive load F applied to the hollow cylindrical body 22. This compressive load F is equivalent to the compressive strength of the hollow cylindrical body 22. When the hollow cylindrical body 22 passes the critical point C, its compressive strength rapidly increases, and has the property of not shrinking in the axial direction any more. In FIG. 8, the hatched area E indicates the amount of impact energy that can be absorbed by the peeling failure of the hollow cylindrical body 22.

図９に示すように、圧縮荷重Ｆに対して中空筒状体２２の剥離破壊量δが小さい場合、即ち、中空筒状体２２の圧縮強度が大きい場合、吸収可能な衝撃エネルギ量Ｅ１は大きいが、その分輸送容器１２に大きな荷重が付加される。従って、輸送容器１２は高い耐久性が要求される。
一方、図１０に示すように、圧縮荷重Ｆに対して中空筒状体２２の剥離破壊量δが大きい場合、即ち、中空筒状体２２の圧縮強度が小さい場合、輸送容器１２に付加される荷重は低減するが、中空筒状体２２が吸収可能な衝撃エネルギ量Ｅ２は低減する。従って、衝撃エネルギ量Ｅ１と同等の衝撃エネルギ量を吸収するためには、中空筒状体２２の剥離破壊量δを大きく取る必要がある。 As shown in FIG. 9, when the peel failure amount δ of the hollow cylindrical body 22 is smaller than the compressive load F, that is, when the compressive strength of the hollow cylindrical body 22 is large, the absorbable impact energy amount E 1 is Although large, a large load is applied to the transport container 12 accordingly. Therefore, the transport container 12 is required to have high durability.
On the other hand, as shown in FIG. 10, when the peel breakdown amount δ of the hollow cylindrical body 22 is large with respect to the compressive load F, that is, when the compressive strength of the hollow cylindrical body 22 is small, it is added to the transport container 12 load is reduced, but the hollow cylindrical body 22 can absorb impact energy amount E 2 is reduced. Therefore, in order to absorb the impact energy amount E 1 equivalent impact energy amounts, it is necessary to increase the peeling fracture of the hollow cylindrical body 22 [delta].

このように、緩衝体１０の潰れ代、緩衝体１０の受荷重面積、輸送容器１２の重量、輸送容器１２の落下高さ、輸送容器１２の落下姿勢等の設計条件に応じて、中空筒状体２２の圧縮強度を設定し、緩衝体１０に配置することで、輸送容器１２に加わる衝撃又は荷重を効率的に緩和できる。
例えば、トラック又は船舶等の輸送中スペースが大きい場合、輸送容器１２の軸方向では、第１のグループＰａに圧縮強度が小さい中空筒状体２２を設け、中空筒状体２２の軸方向の剥離破壊量を多くすることで輸送容器１２に加わる荷重を小さくできる。一方、トラック又は船舶等の輸送中スペースが小さい場合、輸送容器１２の半径方向では、第２のグループＰｒに圧縮強度が大きい中空筒状体２２を設け、中空筒状体２２の軸方向の剥離破壊量を抑えるようにする。 Thus, depending on the design conditions such as the collapsing margin of the shock absorber 10, the load receiving area of the shock absorber 10, the weight of the transport container 12, the falling height of the transport container 12, the dropping posture of the transport container 12, etc. By setting the compressive strength of the body 22 and placing it on the buffer 10, the impact or load applied to the transport container 12 can be effectively mitigated.
For example, when the space during transportation such as a truck or a ship is large, the hollow cylindrical body 22 having small compressive strength is provided in the first group Pa in the axial direction of the transportation container 12 and peeling of the hollow cylindrical body 22 in the axial direction The load applied to the transport container 12 can be reduced by increasing the amount of destruction. On the other hand, when the space during transportation such as a truck or a ship is small, the second group Pr is provided with the hollow cylindrical body 22 having high compressive strength in the radial direction of the transportation container 12 and peeling of the hollow cylindrical body 22 in the axial direction Try to reduce the amount of destruction.

例示的な実施形態では、図３に示すように、中空筒状体２２は壁体（隔壁）が周方向全周に亘って形成されたパイプ形状を有する。
本実施形態では、中空筒状体２２は壁体（隔壁）２２ａにスリットや孔等を有さない中空の筒状構造物であって、壁体２２ａは全周で内部空間Ｓｉを囲む連続した面を有する。
これによって、中空筒状体２２の全周でＦＲＰシート間の剥離破壊を起すことができ、衝撃吸収効果をさらに高めることができる。 In an exemplary embodiment, as shown in FIG. 3, the hollow cylindrical body 22 has a pipe shape in which a wall (partition wall) is formed along the entire circumferential direction.
In the present embodiment, the hollow cylindrical body 22 is a hollow cylindrical structure having no slit, hole or the like in the wall (partition) 22a, and the wall 22a is continuous around the internal space Si on the entire circumference. It has a face.
By this, the peeling failure between FRP sheets can be caused in the whole circumference of hollow cylindrical body 22, and the shock absorbing effect can be further enhanced.

例示的な実施形態では、図１１に示すように、中空筒状体２２（２２Ｃ）は、壁体が互いに交差する方向に配置された複数の板状部材２６及び２８で構成される。板状部材２６及び２８は複数のＦＲＰシート２４が積層されて構成される。
図示した実施形態では、２個の矩形の平坦な板状部材２６及び２８の両縁に一定間隔をもって切込部２６ａ及び２８ａを設ける。そして、切込部２６ａ及び２８ａ同士を互いに差し込むようにし、板状部材２６及び２８を互いに直交して交互に積み重ねることで、中空筒状体２２を構成する。
これによって、中空筒状体を低コストで製造できる。 In the exemplary embodiment, as shown in FIG. 11, the hollow cylindrical body 22 (22C) is composed of a plurality of plate-like members 26 and 28 disposed in the direction in which the wall bodies cross each other. The plate members 26 and 28 are configured by laminating a plurality of FRP sheets 24.
In the illustrated embodiment, both edges of the two rectangular flat plate members 26 and 28 are provided with notches 26a and 28a at regular intervals. Then, the hollow cylindrical body 22 is configured by inserting the notches 26a and 28a into each other and alternately stacking the plate-like members 26 and 28 orthogonal to each other.
By this, a hollow cylindrical body can be manufactured at low cost.

例示的な実施形態では、図１２に示す緩衝体１０（１０Ｃ）において、中空筒状体２２の内部空間Ｓｉ又は撓み許容空間Ｓｃの少なくとも一方に木材又は発泡材で構成された充填物３２を充填する。
例示的な実施形態では、図１３に示す緩衝体１０（１０Ｄ）において、撓み許容空間Ｓｃに発泡材などの充填物３２を充填する。
このように、充填物３２を充填することで、中空筒状体２２の剛性や撓み度の調整が可能になり、緩衝体１０の剛性及び衝撃吸収性能を輸送容器１２の用途に合った最適な条件に調整できる。
図示した実施形態では、充填物３２は中空筒状体２２の内部空間Ｓｉ又は撓み許容空間Ｓｃで中空筒状体２２の軸方向全長に亘り配置される。中空筒状体２２の内部空間Ｓｉ又は撓み許容空間Ｓｃで充填物３２の軸方向の充填率を変えることで、緩衝体１０の剛性及び衝撃吸収性能を調整できる。 In an exemplary embodiment, in the buffer 10 (10C) shown in FIG. 12, at least one of the internal space Si or the deflection allowing space Sc of the hollow cylindrical body 22 is filled with the filling 32 made of wood or foam. Do.
In an exemplary embodiment, in the buffer 10 (10D) shown in FIG. 13, the deflection allowing space Sc is filled with a filler 32 such as a foam material.
Thus, filling the filling 32 enables adjustment of the rigidity and the degree of deflection of the hollow cylindrical body 22, and the rigidity and shock absorbing performance of the buffer 10 are optimum for the use of the transport container 12. It can be adjusted to the conditions.
In the illustrated embodiment, the filling 32 is disposed over the entire axial length of the hollow cylindrical body 22 in the internal space Si of the hollow cylindrical body 22 or in the deflection permissible space Sc. By changing the filling ratio in the axial direction of the filling 32 in the inner space Si or the deflection allowing space Sc of the hollow cylindrical body 22, the rigidity and shock absorbing performance of the shock absorber 10 can be adjusted.

例示的な実施形態では、図３に示すように、ケーシング１６の凹部１６ａの内側面に輸送容器１２の周方向に間隔をおいて複数の補強リブ３４を設け、補強リブ３４の間に中空筒状体２２を配置する。こうして、凹部１６ａの内側面に周方向に交互に中空筒状体２２と補強リブ３４とを配置する。
補強リブ３４を設けることで、荷重負荷時の衝撃吸収材２２の位置ずれ及びすべり等を防止でき、衝撃吸収材２２の衝撃吸収性能を十分に発揮することができる。 In the exemplary embodiment, as shown in FIG. 3, a plurality of reinforcing ribs 34 are provided on the inner surface of the recess 16 a of the casing 16 at intervals in the circumferential direction of the transport container 12, and a hollow cylinder is provided between the reinforcing ribs 34. The rod 22 is placed. Thus, the hollow cylindrical body 22 and the reinforcing rib 34 are alternately arranged in the circumferential direction on the inner side surface of the recess 16a.
By providing the reinforcing rib 34, it is possible to prevent displacement and slippage of the shock absorbing material 22 under load, and the shock absorbing performance of the shock absorbing material 22 can be sufficiently exhibited.

例示的な実施形態では、ケーシング１６を繊維強化プラスチック材で構成する。これによって、緩衝体１０をさらに軽量化及び高強度化できる。   In the exemplary embodiment, casing 16 is comprised of a fiber reinforced plastic material. Thereby, the buffer 10 can be further reduced in weight and strength.

幾つかの実施形態によれば、輸送容器１２の転倒時や落下時等に、緩衝体１０に衝撃（荷重）が加わると、中空筒状体２２の撓みにより、ＦＲＰシート２４のシート間で剥離破壊が起り、この剥離破壊の過程で衝撃を吸収するため、輸送容器１２に対する衝撃を緩和できる。
また、木材を用いないため、木材の課題である高温時の緩衝性能低下を解消でき、かつ品質のバラツキを制御することができるため、裕度設計を最小限に抑えることができ、これによって、緩衝体を小型化かつ低コスト化できる。
また、ＦＲＰシート２４の積層数及び中空筒状体の外径を変えることで、中空筒状体２２の圧縮強度を制御でき、これによって、輸送容器１２の仕様及び付加荷重に応じた緩衝体１０の最適配置が木材と比べ容易になる。 According to some embodiments, when shock (load) is applied to the shock absorbing body 10 when the transport container 12 falls or falls, the hollow cylindrical body 22 is flexed to peel off between the sheets of the FRP sheet 24. Since the failure occurs and the shock is absorbed in the process of the peeling failure, the shock on the transport container 12 can be alleviated.
Also, since no wood is used, it is possible to solve the problem of deterioration of the buffer performance at high temperature, which is a problem of wood, and to control the variation of quality, so that the margin design can be minimized. The buffer can be miniaturized and cost reduced.
Moreover, the compressive strength of the hollow cylindrical body 22 can be controlled by changing the number of laminated layers of the FRP sheet 24 and the outer diameter of the hollow cylindrical body, whereby the buffer 10 according to the specification of the transport container 12 and the additional load. Optimal placement of is easier than wood.

例示的な実施形態によれば、図２及び図４に示すように、中空筒状体２２の軸方向の向きが異なる第１のグループＰａ及び第２のグループＰｒの２つのグループに分け、中空筒状体２２の軸方向が中空筒状体２２に加わる荷重の方向に沿うように配置されるので、荷重が中空筒状体２２の軸方向に加わると、中空筒状体２２は軸方向に縮むと共に、軸方向と交差する方向に撓む。この撓みにより、ＦＲＰシート２４間の剥離破壊が起り、この剥離破壊が起る過程で衝撃を吸収するので、衝撃吸収性能を向上できる。   According to an exemplary embodiment, as shown in FIG. 2 and FIG. 4, the hollow cylindrical body 22 is divided into two groups of a first group Pa and a second group Pr different in axial orientation, Since the axial direction of the cylindrical body 22 is arranged along the direction of the load applied to the hollow cylindrical body 22, when a load is applied in the axial direction of the hollow cylindrical body 22, the hollow cylindrical body 22 axially moves. As it shrinks, it bends in the direction intersecting with the axial direction. By this bending, the peeling failure between the FRP sheets 24 occurs, and the shock is absorbed in the process of the peeling failure, so that the shock absorbing performance can be improved.

例示的な実施形態によれば、図２及び図４に示すように、中空筒状体２２に加わると想定される異なる方向の２以上の荷重Ｆａ、Ｆｒ及びＦｔの方向に応じて、中空筒状体２２の軸方向が異なる２以上の部位Ｐａ、Ｐｒ及びＰｔが設けられるので、各部位で常に中空筒状体２２の軸方向を荷重の方向に合わせることができる。
例示的な実施形態によれば、図２及び図４に示すように、中空筒状体２２に加わると想定される異なる方向の２以上の荷重Ｆａ、Ｆｒ及びＦｔの方向に応じて、中空筒状体２２の軸方向が異なる２以上のグループＰａ、Ｐｒ及びＰｔが設けられるので、緩衝体１０の各部位で中空筒状体２２の軸方向を荷重の方向に合わせることができる。
従って、輸送容器１２の多様な倒れや落下の姿勢等に対応して、ＦＲＰシート２４の剥離破壊による衝撃吸収効果を確実に発揮できる。 According to an exemplary embodiment, as shown in FIGS. 2 and 4, depending on the direction of the two or more loads Fa, Fr and Ft of different directions assumed to be applied to the hollow cylindrical body 22, the hollow cylinder Since two or more portions Pa, Pr and Pt having different axial directions of the rod 22 are provided, the axial direction of the hollow cylindrical body 22 can be always aligned with the direction of load at each portion.
According to an exemplary embodiment, as shown in FIGS. 2 and 4, depending on the direction of the two or more loads Fa, Fr and Ft of different directions assumed to be applied to the hollow cylindrical body 22, the hollow cylinder Since two or more groups Pa, Pr and Pt having different axial directions of the body 22 are provided, the axial direction of the hollow cylindrical body 22 can be aligned with the direction of load at each portion of the buffer 10.
Therefore, it is possible to reliably exhibit an impact absorbing effect due to the peeling and breakage of the FRP sheet 24 in response to various falling and falling postures and the like of the transport container 12.

例示的な実施形態によれば、中空筒状体２２は壁体２２ａが周方向全周に亘って形成されたパイプ形状を有するため、中空筒状体２２の全周でＦＲＰシート間の剥離破壊を起すことができ、衝撃吸収効果をさらに高めることができる。
例示的な実施形態によれば、図１１に示すように、中空筒状体２２（２２Ｃ）は、互いに交差するように配置された２個の矩形の板状部材２６及び２８を用いて製造されるので、低コストで製造できる。 According to an exemplary embodiment, since the hollow cylindrical body 22 has a pipe shape in which the wall body 22a is formed along the entire circumferential direction, the peel fracture between the FRP sheets in the entire circumference of the hollow cylindrical body 22. The shock absorption effect can be further enhanced.
According to an exemplary embodiment, as shown in FIG. 11, a hollow cylindrical body 22 (22C) is manufactured using two rectangular plate members 26 and 28 arranged to intersect each other. Can be manufactured at low cost.

例示的な実施形態によれば、図１２及び図１３に示すように、中空筒状体２２の内部空間Ｓｉ又は撓み許容空間Ｓｃの少なくとも一方に木材又は発泡材で構成された充填物３２を充填することで、中空筒状体２２の剛性や撓み度の調整が可能になり、緩衝体１０の剛性及び衝撃吸収性能を輸送容器１２の用途に合った最適な条件に調整できる。   According to an exemplary embodiment, as shown in FIGS. 12 and 13, at least one of the inner space Si or the deflection allowing space Sc of the hollow cylindrical body 22 is filled with the filling 32 made of wood or foam. By doing this, the rigidity and the degree of deflection of the hollow cylindrical body 22 can be adjusted, and the rigidity and shock absorbing performance of the buffer 10 can be adjusted to the optimum conditions for the use of the transport container 12.

例示的な実施形態によれば、図３に示すように、ケーシング１６の凹部１６ａの内側面に周方向に交互に中空筒状体２２と補強リブ３４とを配置することで、荷重負荷時の衝撃吸収材２２の位置ずれ及びすべり等を防止でき、衝撃吸収材２２の衝撃吸収性能を十分に発揮することができる。
例示的な実施形態によれば、ケーシング１６を繊維強化プラスチック材で構成することで、緩衝体１０をさらに軽量化及び高強度化できる。
例示的な実施形態によれば、緩衝体１０を被輸送物１５として放射性物質を収納したキャスクに適用することで、キャスクに加わる衝撃又は荷重を確実に緩和して放射性物質の漏洩を防止できると共に、緩衝体の小型化及び低コスト化を達成できる。 According to an exemplary embodiment, as shown in FIG. 3, by alternately arranging the hollow cylindrical body 22 and the reinforcing rib 34 in the circumferential direction on the inner side surface of the recess 16 a of the casing 16, the load is applied. It is possible to prevent displacement and slippage of the impact absorbing material 22 and the like, and the impact absorbing performance of the impact absorbing material 22 can be sufficiently exhibited.
According to an exemplary embodiment, the shock absorbing body 10 can be further reduced in weight and strength by configuring the casing 16 with a fiber reinforced plastic material.
According to an exemplary embodiment, by applying the buffer body 10 as the transported object 15 to the cask containing the radioactive substance, it is possible to reliably reduce the impact or load applied to the cask and prevent the leakage of the radioactive substance. , Miniaturization and cost reduction of the buffer can be achieved.

図１４は緩衝体１０の他の用途を示す。図１４において、冷却水ｗが貯留された使用済燃料プール４０に設けられたキャスクピット４２において、キャスク４４がクレーン４６で吊り上げられ、又は吊り下ろされる状態がある。
キャスク４４の下方の床面４０ａに緩衝体１０が設けられている。緩衝体１０はキャスク４４が落下すると想定される位置に配置されている。緩衝体１０に図示された矢印は、緩衝体１０に設けられた中空筒状体２２の軸方向を示している。
こうして、キャスク４４の落下位置に緩衝体１０を配置することで、落下時の衝撃を効率的に緩和でき、キャスク４４及びキャスクピット床面の破損を抑制できる。 FIG. 14 shows another application of the buffer 10. In FIG. 14, in the cask pit 42 provided in the spent fuel pool 40 in which the cooling water w is stored, the cask 44 may be lifted or suspended by the crane 46.
A buffer 10 is provided on the floor 40 a below the cask 44. The buffer 10 is disposed at a position where the cask 44 is expected to fall. Arrows illustrated in the buffer 10 indicate the axial direction of the hollow cylindrical body 22 provided in the buffer 10.
Thus, by disposing the buffer body 10 at the drop position of the cask 44, the impact at the time of drop can be efficiently mitigated, and damage to the cask 44 and the cask pit floor can be suppressed.

図１５は緩衝体１０のさらに他の用途を示す。図１５において、キャスク４４は貯蔵用又はキャスク４４に何らかの処理を行う建屋４８にクレーン４６に吊下されている。
クレーン４６に吊下されたキャスク４４の移動経路の下方位置の床面４８ａに緩衝体１０が配置されている。また、クレーン４６で移動中のキャスク４４がぶつかるおそれのある内側壁４８ｂにも緩衝体１０が設けられている。
上記位置に緩衝体１０を配置することで、万一キャスク４４が落下し床面４８ａ又は内側壁４８ｂにぶつかっても、キャスク４４及び床面４８ａ及び内側壁４８ｂに対する衝撃を緩和でき、キャスク４４及び床面４８ａ及び内側壁４８ｂの破損を抑制できる。 FIG. 15 shows still another application of the buffer 10. In FIG. 15, the cask 44 is suspended from a crane 46 in a building 48 which performs storage or some processing on the cask 44.
The buffer 10 is disposed on the floor surface 48 a at a lower position of the moving path of the cask 44 suspended by the crane 46. In addition, the shock absorber 10 is provided on the inner side wall 48 b which may be hit by the cask 44 moving by the crane 46.
By arranging the shock absorber 10 at the above position, even if the cask 44 falls and strikes the floor surface 48a or the inner side wall 48b, the impact on the cask 44 and the floor surface 48a and the inner side wall 48b can be mitigated. Damage to the floor surface 48a and the inner side wall 48b can be suppressed.

本発明の少なくとも一実施形態によれば、低コストで緩衝性能が高い輸送容器用緩衝体を実現でき、特に、放射性物質を収納したキャスクに好適である。   According to at least one embodiment of the present invention, it is possible to realize a low cost and high shock absorbing buffer for a transport container, and in particular, it is suitable for a cask containing a radioactive substance.

１０（１０Ａ、１０Ｂ、１０Ｃ、１０Ｄ） 緩衝体
１２ 輸送容器
１４ 輸送容器本体
１５ 被輸送物
１６ ケーシング
１６ａ 凹部
１８ 開閉蓋
２０ 衝撃吸収部材
２２（２２Ａ、２２Ｂ、２２Ｃ） 中空筒状体
２２ａ 壁体
２４ ＦＲＰシート
２６，２８ 板状部材
２６ａ、２８ａ 切込部
３０ ボルト穴
３２ 充填物
３４ 補強リブ
４０ 使用済燃料プール
４０ａ 床面
４２ キャスクピット
４４ キャスク
４６ クレーン
４８ 建屋
４８ａ 床面
４８ｂ 内側壁
Ｃ 臨界点
Ｅ，Ｅ１，Ｅ２ 衝撃エネルギ量
Ｆ、Ｆｏ 圧縮荷重
Ｆａ、Ｆｒ、Ｆｔ 荷重
Ｐａ 端面部位
Ｐｒ 周面部位
Ｐｔ 角部
Ｓｃ 撓み許容空間
Ｓｉ，ｓ 内部空間
δ 変形量
Reference Signs List 10 (10A, 10B, 10C, 10D) Buffer 12 Transport container 14 Transport container main body 15 Shipment 16 Casing 16a Recess 18 Opening / closing lid 20 Shock absorbing member 22 (22A, 22B, 22C) Hollow cylindrical body 22a Wall 24 FRP sheet 26, 28 plate member 26a, 28a notch 30 bolt hole 32 filling 34 reinforcing rib 40 spent fuel pool 40a floor 42 cask pit 44 cask 46 crane 48 building 48a floor 48b inner side wall C critical point E , E 1 , E 2 Impact energy F, Fo Compressive load Fa, Fr, Ft Load Pa End face part Pr Peripheral part Pt corner part Sc Deflection space Si, s Internal space δ deformation

Claims (12)

被輸送物を収容可能な輸送容器に装着される輸送容器用緩衝体であって、
内部空間を有するケーシングと、
前記内部空間に充填される衝撃吸収部材と、
を備え、
前記衝撃吸収部材は、複数の繊維強化プラスチック製シートが積層されてなる壁体から構成される複数の中空筒状体を含むとともに、前記複数の中空筒状体が互いに離間するように撓み許容空間を介して並列配置されて形成されることを特徴とする輸送容器用緩衝体。 A buffer for a transport container mounted on a transport container capable of containing a transported object, comprising:
A casing having an internal space;
An impact absorbing member filled in the internal space;
Equipped with
The impact absorbing member includes a plurality of hollow cylindrical bodies configured by a wall body in which a plurality of fiber reinforced plastic sheets are stacked, and a deflection allowable space such that the plurality of hollow cylindrical bodies are separated from each other A buffer for a transport container, which is formed in parallel with each other. 被輸送物を収容可能な輸送容器に装着される輸送容器用緩衝体であって、A buffer for a transport container mounted on a transport container capable of containing a transported object, comprising:
内部空間を有するケーシングと、A casing having an internal space;
前記内部空間に充填される衝撃吸収部材と、An impact absorbing member filled in the internal space;
を備え、Equipped with
前記衝撃吸収部材は、複数の繊維強化プラスチック製シートが積層されてなる壁体から構成される複数の中空筒状体が、前記中空筒状体の軸方向と交差する方向の撓みを許容するための撓み許容空間を介して並列配置されて形成されることを特徴とする輸送容器用緩衝体。In the impact absorbing member, a plurality of hollow cylindrical bodies constituted by a wall formed by laminating a plurality of fiber reinforced plastic sheets allow bending in a direction intersecting the axial direction of the hollow cylindrical bodies. A shock absorber for a transport container, which is formed in parallel arrangement via a deflection allowance space. 前記中空筒状体における前記繊維強化プラスチック製シートの積層数及び前記中空筒状体の外径の少なくとも一方は、前記輸送容器の設計条件に応じて設定される、請求項1又は２に記載の輸送容器用緩衝体。The number of laminations of the sheet made of fiber reinforced plastic in the hollow cylindrical body and at least one of the outer diameter of the hollow cylindrical body are set according to the design condition of the transport container. Transport container buffer. 前記複数の中空筒状体は、前記ケーシングの外面のうち前記輸送容器に対向しない面の少なくとも１つに対して軸方向が略垂直になるように配置されていることを特徴とする請求項１から３のいずれか一項に記載の輸送容器用緩衝体。 The plurality of hollow cylindrical bodies are arranged such that the axial direction is substantially perpendicular to at least one of the surfaces of the outer surface of the casing not facing the transport container. 3. A buffer for a transport container according to any one of 3. to 3 . 前記複数の中空筒状体は、
第１の方向に沿って配列される第１のグループと、
前記第１の方向に交差する第２の方向に沿って配列される第２のグループと、
を含むことを特徴とする請求項１から４のいずれか一項に記載の輸送容器用緩衝体。 The plurality of hollow cylindrical bodies are
A first group arranged along a first direction;
A second group arranged along a second direction intersecting the first direction;
The buffer for a transport container according to any one of claims 1 to 4, comprising 前記輸送容器は略円柱形状を有し、
前記ケーシングは前記輸送容器の端部に嵌入可能な凹部を有し、
前記第１のグループは軸方向端面が前記略円柱形状の端面に対向するように配列された前記中空筒状体であり、
前記第２のグループは軸方向端面が前記略円柱形状の周面に対向するように配置された
前記中空筒状体であることを特徴とする請求項５に記載の輸送容器用緩衝体。 The transport container has a substantially cylindrical shape,
The casing has a recess which can be fitted into the end of the transport container,
The first group is the hollow cylindrical body arranged so that an axial end face faces the end face of the substantially cylindrical shape,
The shock absorber according to claim 5 , wherein the second group is the hollow cylindrical body disposed so that an axial end face faces the circumferential surface of the substantially cylindrical shape. 前記中空筒状体は、前記壁体が周方向全周に亘って形成されたパイプ形状を有することを特徴とする請求項１乃至６の何れか１項に記載の輸送容器用緩衝体。 The shock absorber according to any one of claims 1 to 6 , wherein the hollow cylindrical body has a pipe shape in which the wall body is formed along the entire circumferential direction. 前記中空筒状体は、前記壁体が互いに交差する方向に配置された複数の板状部材が組み合わされて構成されることを特徴とする請求項１乃至７の何れか１項に記載の輸送容器用緩衝体。 The transportation according to any one of claims 1 to 7 , wherein the hollow cylindrical body is configured by combining a plurality of plate-like members arranged in the direction in which the wall bodies intersect with each other. Container buffer. 前記中空筒状体の内部又は前記撓み許容空間の少なくとも一方に充填される木材又は発泡材で構成された充填物をさらに備えることを特徴とする請求項１乃至８の何れか１項に記載の輸送容器用緩衝体。 The filler according to any one of claims 1 to 8 , further comprising a filling made of wood or a foam, which is filled in at least one of the inside of the hollow cylindrical body and the deflection allowance space. Transport container buffer. 前記ケーシングの凹部の内側面に前記輸送容器の周方向に間隔をおいて設けられた複数の補強リブをさらに備え、
前記複数の補強リブの間に前記中空筒状体が配置されることを特徴とする請求項６に記載の輸送容器用緩衝体。 The inner surface of the recess of the casing further comprises a plurality of reinforcing ribs provided at intervals in the circumferential direction of the transport container,
The buffer for a transport container according to claim 6 , wherein the hollow cylindrical body is disposed between the plurality of reinforcing ribs. 前記ケーシングが繊維強化プラスチック材で構成されることを特徴とする請求項１乃至１０の何れか１項に記載の輸送容器用緩衝体。 The shock absorber for a transport container according to any one of claims 1 to 10 , wherein the casing is made of a fiber reinforced plastic material. 内部に放射性物質を収容する筒状の輸送容器と、
請求項１乃至１１の何れか１項に記載の緩衝体と、
を備えることを特徴とするキャスク。 A cylindrical transport container containing radioactive material inside;
The buffer according to any one of claims 1 to 11 .
Cask characterized by having.
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