JP2018144830A - Storage tank - Google Patents
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- JP2018144830A JP2018144830A JP2017039279A JP2017039279A JP2018144830A JP 2018144830 A JP2018144830 A JP 2018144830A JP 2017039279 A JP2017039279 A JP 2017039279A JP 2017039279 A JP2017039279 A JP 2017039279A JP 2018144830 A JP2018144830 A JP 2018144830A
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- 239000002184 metal Substances 0.000 claims abstract description 76
- 238000013016 damping Methods 0.000 claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 16
- 239000010959 steel Substances 0.000 claims abstract description 16
- 239000000463 material Substances 0.000 claims description 12
- 239000002131 composite material Substances 0.000 claims description 4
- 150000001875 compounds Chemical class 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 23
- 230000005284 excitation Effects 0.000 description 9
- 239000007788 liquid Substances 0.000 description 9
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- 230000004044 response Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 5
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 4
- 239000011151 fibre-reinforced plastic Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000036962 time dependent Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Abstract
Description
本発明は、地上に設置して液体を貯蔵するためのタンクに関する。特に、地面とタンクの底面との間に制震手段を最適化して配置することで、地震時に発生するバルジング（流体−構造連成振動）を低減したタンクに関する。 The present invention relates to a tank that is installed on the ground and stores a liquid. In particular, the present invention relates to a tank that reduces bulging (fluid-structure coupled vibration) that occurs during an earthquake by optimizing the arrangement of vibration control means between the ground and the bottom surface of the tank.
各種の工場や給水施設に設置されるタンクとして、壁面が金属製のタンクが知られている。このようなタンクは、タンク全体の重量に対して貯蔵されている液体の重量の割合が高くなっており、地震の際には、タンク自体の振動モードと貯蔵されている液体の振動の相互作用によって複雑な振動現象が発生する。タンクの主な振動モードとして、スロッシングモードとバルジングモードとが知られている。スロッシングモードとは、地震動にと貯水槽内の水との共振によって液体の表面が大きくうねることが特徴の、比較的長周期の振動現象である。バルジングモードとは、タンクの壁面と中の液体とが連成振動することによって発生する、比較的短周期の振動現象である。 As tanks installed in various factories and water supply facilities, tanks with metal walls are known. In such a tank, the ratio of the weight of the stored liquid is high with respect to the weight of the entire tank, and in the event of an earthquake, the interaction between the vibration mode of the tank itself and the vibration of the stored liquid As a result, a complicated vibration phenomenon occurs. As the main vibration mode of the tank, a sloshing mode and a bulging mode are known. The sloshing mode is a relatively long-period vibration phenomenon characterized by the fact that the surface of the liquid is greatly swelled by seismic motion and resonance with water in the water tank. The bulging mode is a vibration phenomenon with a relatively short period that occurs when the wall surface of the tank and the liquid in the tank vibrate.
一般に、液体を貯蔵している金属製のタンクのバルジングモードの固有振動数は３〜１０Ｈｚ程度であり、その振動の周期は通常の構造物よりも短いと言われている。また、繊維強化プラスチック（ＦＲＰ）製のタンクの場合、４〜５Ｈｚの固有振動数を持つものが多いと言われている。通常の免震構造物は、地震との共振を防止するために、一次固有周期を４秒以上にすることを目標としているが、タンクの場合は、その振動の周期をわずかに長く変化させることで、発生する動水圧を低減できると考えられる。 In general, the natural frequency of a bulging mode of a metal tank storing a liquid is about 3 to 10 Hz, and the period of vibration is said to be shorter than that of a normal structure. In addition, it is said that many tanks made of fiber reinforced plastic (FRP) have a natural frequency of 4 to 5 Hz. In general seismic isolation structures, the primary natural period is set to 4 seconds or more in order to prevent resonance with the earthquake, but in the case of tanks, the period of vibration is changed slightly longer. Therefore, it is considered that the generated hydrodynamic pressure can be reduced.
これまでに、スロッシングを抑制する構造は、種々提案されている。特許文献１には、タンク本体内に減衰板を設置して内容液から生ずる揺動を減衰させる構成が開示されている。特許文献２には、フレームリングとワイヤとを複数配設し、さらに液面に連動して伸縮、展開するスロッシング防止膜を備えたタンクが開示されている。特許文献３には、大型タンクの固有周期を長周期化するために底面に対向する支持板を支柱によって指示し、その支持板と底面との間に積層ゴムを挟んだタンクが開示されている。 So far, various structures for suppressing sloshing have been proposed. Patent Document 1 discloses a configuration in which an attenuation plate is installed in a tank body to attenuate the oscillation generated from the content liquid. Patent Document 2 discloses a tank having a sloshing prevention film in which a plurality of frame rings and wires are provided, and which further expands and contracts in conjunction with the liquid level. Patent Document 3 discloses a tank in which a support plate facing the bottom surface is indicated by a support column in order to lengthen the natural period of a large tank, and a laminated rubber is sandwiched between the support plate and the bottom surface. .
本発明は、タンクのバルジングモード（以下、省略してバルジングと言う）によって発生する動水圧を低減するために、振動をより長周期化したタンクを提供することを解決すべき課題としている。 An object of the present invention is to provide a tank having a longer period of vibration in order to reduce the hydraulic pressure generated by a tank bulging mode (hereinafter referred to as bulging).
請求項１記載の発明は、制震部材とタンク本体とを備えたタンクに関する。本発明のタンクは、矩形状の平板からなる底面と、底面に対して垂直に接合されている側面と、側面の上端部に配置されている上面と、を備えているタンク本体を備えている。また本発明のタンクは、タンク本体の底面の下側に互いに間隔をあけて配置されて、底面と側面との接合部分の少なくとも一部を支持する複数の制震部材を備えている。本発明のタンクは、制震部材が、制震部材の上面を構成する上側金属板と制震部材の下面を構成する下側金属板とからなる一対の金属板と、この上側金属板と下側金属板との間に設置される平板状のゴム板とを備える複合部材であることを特徴とする。 The invention according to claim 1 relates to a tank including a vibration control member and a tank body. A tank according to the present invention includes a tank main body including a bottom surface made of a rectangular flat plate, a side surface joined perpendicularly to the bottom surface, and an upper surface disposed at an upper end portion of the side surface. . In addition, the tank of the present invention includes a plurality of vibration control members that are disposed below the bottom surface of the tank main body and spaced apart from each other and support at least a part of the joint portion between the bottom surface and the side surface. In the tank of the present invention, the damping member includes a pair of metal plates composed of an upper metal plate constituting the upper surface of the damping member and a lower metal plate constituting the lower surface of the damping member, and the upper metal plate and the lower metal plate. It is a composite member provided with the flat rubber plate installed between side metal plates.
発明者は、バルジングの現象を鋭意検討した結果、タンクのバルジングで発生する動水圧を低減させるためには、タンクの側面に加わる荷重を低減することが有効であることを見いだして、本発明を完成させるに至った。本発明のタンクは、底面と側面とが接合されている接合部分の少なくとも一部を複数の制震部材で支持することによって、タンク本体の下側からタンク底面を経て側面に伝わる地震発生時の荷重を低減し、これによりバルジングで発生する動水圧を効率よく低減することができる。 As a result of earnestly examining the phenomenon of bulging, the inventor has found that it is effective to reduce the load applied to the side surface of the tank in order to reduce the hydraulic pressure generated by bulging the tank. It came to complete. The tank of the present invention supports at least a part of the joining portion where the bottom surface and the side surface are joined by a plurality of vibration control members, so that an earthquake can be transmitted from the lower side of the tank body to the side surface via the tank bottom surface. It is possible to reduce the load and thereby efficiently reduce the hydraulic pressure generated by bulging.
本発明のタンクの制震部材は、一対の金属板及びゴム板がいずれも略矩形状であり、
ゴム板の縦方向の辺の長さが一対の金属板の縦方向の辺の長さより短く、且つゴム板の横方向の辺の長さが一対の金属板の横方向の辺の長さより短くあって、上面視でゴム板が金属板の内側に設置されている。
In the tank damping member of the present invention, the pair of metal plates and rubber plates are both substantially rectangular,
The length of the vertical side of the rubber plate is shorter than the length of the vertical side of the pair of metal plates, and the length of the horizontal side of the rubber plate is shorter than the length of the horizontal side of the pair of metal plates. Therefore, the rubber plate is installed inside the metal plate when viewed from above.
また代替的には、制震部材の一対の金属板が略矩形状であり、且つゴム板が略円形であり、ゴム板の径方向の長さが、一対の金属板の一辺の長さより短く、上面視でゴム板が金属板の内側に設置されている。 Alternatively, the pair of metal plates of the vibration control member is substantially rectangular and the rubber plate is substantially circular, and the radial length of the rubber plate is shorter than the length of one side of the pair of metal plates. The rubber plate is installed inside the metal plate when viewed from above.
本発明の制震部材は、タンク本体の底面の下側の鋼材の下面に、４枚以上配置されていることを特徴とする。 Four or more damping members of the present invention are arranged on the lower surface of the steel material below the bottom surface of the tank body.
本発明のタンクは、タンクの底面と側面との接合部分の少なくとも一部を支持する制震部材を備えている。この構成により、タンク本体が制震部材を介して設置場所に設置されることになり、地震の荷重がタンクの側面に伝わることが効果的に抑制される。この結果、タンク側面の共振を低減してバルジングによって発生する動水圧を低減することができる。 The tank of the present invention includes a vibration control member that supports at least a part of a joint portion between the bottom surface and the side surface of the tank. With this configuration, the tank main body is installed at the installation location via the vibration control member, and the transmission of the earthquake load to the side surface of the tank is effectively suppressed. As a result, the hydraulic pressure generated by bulging can be reduced by reducing the resonance of the tank side surface.
本発明のタンクの制震部材は、制震部材を二枚の金属板と金属板の間に設置される平板状のゴム板（厚みに対して平面の辺が３倍以上）とからなる複合部材とすることで、同じ容積のゴム板単体を用いた場合よりもゴムの撓みを大きく抑制することができる。 The damping member of the tank of the present invention comprises a composite member comprising a damping rubber member and a flat rubber plate (a plane side is 3 times or more of the thickness) installed between two metal plates. By doing so, the bending of rubber can be largely suppressed as compared with the case where a single rubber plate having the same volume is used.
本発明のタンクの制震部材は、制震部材を二枚の金属板とこの金属板の間に設置される平板状のゴム板とからなる複合部材としたことにより、ゴム板単体で制震部材を構成するよりも高い耐久性を得ている。 In the tank damping member of the present invention, the damping member is a composite member comprising two metal plates and a flat rubber plate installed between the metal plates. It has higher durability than the construction.
バルジング発生時の動水圧を低減できることで、たとえ強度を従来よりも低くしても、地震による破損の恐れのないタンクを設計することができる。この結果、側面や上面に従来よりも板厚の薄い金属板を使用することが可能となり、また内部補強材も従来よりも断面の小さい部材を使用することができ、より安価にタンクを製造することができる。 By reducing the dynamic water pressure when bulging occurs, it is possible to design a tank that will not be damaged by an earthquake even if its strength is lower than the conventional one. As a result, it is possible to use a metal plate having a thinner thickness than the conventional one on the side surface and the upper surface, and the internal reinforcing material can be a member having a smaller cross section than the conventional one, and the tank is manufactured at a lower cost. be able to.
制震部材の金属板とゴム板とがいずれも略矩形状を有しており、ゴム板の縦方向の辺の長さを一対の金属板の縦方向の辺の長さより短くし、且つゴム板の横方向の辺の長さを一対の金属板の横方向の辺の長さより短くすることで、ゴム板を金属板と金属板の間の空間に収容することが可能となり、ゴム板は好ましい均一な撓み量で変形する。 Both the metal plate and the rubber plate of the vibration control member have a substantially rectangular shape, the length of the vertical side of the rubber plate is shorter than the length of the vertical side of the pair of metal plates, and the rubber By making the length of the lateral sides of the plates shorter than the length of the lateral sides of the pair of metal plates, the rubber plate can be accommodated in the space between the metal plates, and the rubber plate is preferably uniform Deforms with an appropriate amount of deflection.
同様に、制震部材の金属板を略矩形状とし、且つゴム板を略円形として、ゴム板を金属板と金属板の間の空間に収容することで、ゴム板は好ましい均一な撓み量で変形する。 Similarly, the rubber plate is deformed with a preferable uniform deflection amount by making the metal plate of the damping member substantially rectangular and the rubber plate substantially circular and accommodating the rubber plate in the space between the metal plates. .
本発明の制震部材を互いに間隔を開けて複数配置することで、タンク設置時の制震部材の配置が容易となり、タンク本体を支持する箇所の最適化もまた容易となる。制震部材に局所的に荷重がかかった場合であっても、ゴム板の変形の自由度が高くなり、ゴム板の制震の機能を充分に発揮させることができる。 By arranging a plurality of the vibration control members of the present invention at intervals, it becomes easy to arrange the vibration control members when installing the tank, and it is also easy to optimize the location for supporting the tank body. Even when a load is locally applied to the damping member, the degree of freedom of deformation of the rubber plate is increased, and the damping function of the rubber plate can be fully exhibited.
以下に、金属板を用いて略立方体形状としたタンクに、本発明を適用した実施形態について、特に好適な形態を列記する。
（形態１）底面は略正方形であり、底面の各辺に沿って４つの側面が垂直に配置されている。側面および上面は、略正方形の平板の中央に、外側に凸である球面状の凸部が設けられた側面部材を複数溶接して構成されている。
（形態２）制震部材は、略正方形の２枚の金属板の間に、略正方形のゴム板が挟まれて構成されている。ゴム板の一辺の長さは金属板の一辺の長さよりも短く、ゴム板は金属板の外側にはみ出すことなく設置される。
（形態３）制震部材は、略正方形の２枚の金属板の間に、略円形のゴム板が挟まれて構成されている。ゴム板の直径は金属板の一辺の長さよりも短く、ゴム板は金属板の外側にはみ出すことなく設置される。
（形態４）制震部材は、鋼材下面の頂点と、各辺の中間部に、互いに間隔を開けて配置される。
（形態５）制震部材としてゴム板に求められる特性は、主に、１）タンクを垂直方向に支持する特性、２）荷重を受けたとき、柔軟に変位した後元の形状に復元する特性、３）振動の減衰特性、の３つである。これらの特性を満たして十分な制震効果の得られるゴム板は、圧縮永久歪が２０％以下、引張り強さが５〜１４Ｎ／ｍｍ２、静的せん断弾性率が０．２〜０．５Ｎ／ｍｍ２ 程度の物性値を有する。
Below, especially suitable forms are listed for embodiments in which the present invention is applied to a tank having a substantially cubic shape using a metal plate.
(Mode 1) The bottom surface is substantially square, and four side surfaces are vertically arranged along each side of the bottom surface. The side surface and the upper surface are formed by welding a plurality of side surface members provided with spherical convex portions protruding outward at the center of a substantially square flat plate.
(Mode 2) The vibration control member is configured by sandwiching a substantially square rubber plate between two substantially square metal plates. The length of one side of the rubber plate is shorter than the length of one side of the metal plate, and the rubber plate is installed without protruding outside the metal plate.
(Mode 3) The vibration damping member is configured by sandwiching a substantially circular rubber plate between two substantially square metal plates. The diameter of the rubber plate is shorter than the length of one side of the metal plate, and the rubber plate is installed without protruding outside the metal plate.
(Mode 4) The vibration control members are arranged at a distance from each other at the apex of the lower surface of the steel material and the middle part of each side.
(Mode 5) The characteristics required of the rubber plate as the vibration control member are mainly 1) the characteristic of supporting the tank in the vertical direction, and 2) the characteristic of flexibly displacing the original shape after receiving a load. 3) Vibration damping characteristics. A rubber plate that satisfies these characteristics and provides a sufficient damping effect has a compression set of 20% or less, a tensile strength of 5 to 14 N / mm 2 , and a static shear modulus of 0.2 to 0.5 N. / mm with a 2 degree of physical properties.
（実施例１）
以下に、図面を参照しつつ、本発明の実施例１のタンク１の構成と作用について詳細に説明する。図１に、本実施例のタンク１の斜視図を示す。タンク１は、タンク本体１１と鋼材１５と制震部材２とを備えている。
Example 1
Hereinafter, the configuration and operation of the tank 1 according to the first embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 1, the perspective view of the tank 1 of a present Example is shown. The tank 1 includes a tank body 11, a steel material 15, and a vibration control member 2.
本実施例のタンク本体１１は、略正方形の底面１２と、底面１２の各辺に沿って接合されて底面１２から垂直に延在する４つの略正方形の側面１３と、側面１３の上端部に配置されて屋根として機能する上面１４とを備えており、幅３０００ｍｍ、奥行き３０００ｍｍ、高さ方向３０００ｍｍの略立方体形状に形成されている。ここでいう奥行きの方向とは、図中の矢印Ａで示された方向であり、幅方向とは、水平面内で図中の矢印Ａに対して垂直な方向である。 The tank body 11 of the present embodiment has a substantially square bottom surface 12, four substantially square side surfaces 13 joined along each side of the bottom surface 12 and extending perpendicularly from the bottom surface 12, and an upper end portion of the side surface 13. And an upper surface 14 that functions as a roof and is formed in a substantially cubic shape having a width of 3000 mm, a depth of 3000 mm, and a height direction of 3000 mm. The direction of depth here is a direction indicated by an arrow A in the figure, and the width direction is a direction perpendicular to the arrow A in the figure within a horizontal plane.
タンク本体１１の側面１３および上面１４は、略正方形のパネル２０を水平方向に３枚、高さ方向に３列ずつ溶接して形成されている。パネル２０は、中央に外側に向かって凸である球面状の凸部が設けられたＳＵＳ３０４製の鋼板である。側面１３および上面１４が、球面状の凸部を備えた複数のパネル２０を溶接することによって形成されていることで、側面１３を単に平面で形成した場合と比較してタンク本体１１の歪みを低減すると共に剛性を高くすることができ、結果として荷重に対する変形量が小さくなっている。 The side surface 13 and the upper surface 14 of the tank body 11 are formed by welding three substantially square panels 20 in the horizontal direction and three rows in the height direction. The panel 20 is a steel plate made of SUS304 provided with a spherical convex portion that is convex outward at the center. The side surface 13 and the upper surface 14 are formed by welding a plurality of panels 20 having spherical convex portions, so that the distortion of the tank body 11 can be reduced as compared with the case where the side surface 13 is simply formed as a flat surface. It is possible to reduce the rigidity and increase the rigidity. As a result, the deformation amount with respect to the load is reduced.
図２（ａ）に、制震部材２の平面図を示し、図２（ｂ）に制震部材２の正面図を示す。制震部材２は、下側金属板３と上側金属板５とからなる一対の金属板３，５と、この金属板の間に設置される平板状のゴム板４とで構成される。下側金属板３は、縦方向１７０ｍｍ、横方向１７０ｍｍ、厚さ１０ｍｍの正方形の鋼板であり、制震部材２の下面を構成する。上側金属板５は、下側金属板３と同一寸法の、縦方向１７０ｍｍ、横方向１７０ｍｍ、厚さ１０ｍｍの正方形の鋼板であり、制震部材２の上面を構成する。下側金属板３と上側金属板５との間に設置される平板状のゴム板４は、縦方向１５０ｍｍ、横方向１５０ｍｍ、厚さ１０ｍｍの正方形の制震ゴムで構成されている。本実施例では、高減衰ゴムを適用した。ゴム板４と一対の金属板３，５は、中心で位置合わせをして設置されている。すなわち、ゴム板４の端辺の位置が、下側金属板３および上側金属板５の外周から１０ｍｍ内側に位置するように設置されている。金属板３，５に挟まれたゴム板４が、金属板３，５の内側に収容されて振動時にはみださないことで、ゴム板４の過剰な変形が抑制され、ゴム板４は好ましい均一な撓み量で変形する。 FIG. 2A shows a plan view of the vibration control member 2, and FIG. 2B shows a front view of the vibration control member 2. The vibration control member 2 includes a pair of metal plates 3 and 5 including a lower metal plate 3 and an upper metal plate 5, and a flat rubber plate 4 installed between the metal plates. The lower metal plate 3 is a square steel plate having a vertical direction of 170 mm, a horizontal direction of 170 mm, and a thickness of 10 mm, and constitutes the lower surface of the vibration control member 2. The upper metal plate 5 is a square steel plate having the same dimensions as the lower metal plate 3 and having a vertical direction of 170 mm, a horizontal direction of 170 mm, and a thickness of 10 mm, and constitutes the upper surface of the vibration control member 2. The flat rubber plate 4 installed between the lower metal plate 3 and the upper metal plate 5 is composed of a square damping rubber having a longitudinal direction of 150 mm, a lateral direction of 150 mm, and a thickness of 10 mm. In this example, high damping rubber was applied. The rubber plate 4 and the pair of metal plates 3 and 5 are installed by being aligned at the center. That is, the rubber plate 4 is installed such that the end side position is located 10 mm inside from the outer periphery of the lower metal plate 3 and the upper metal plate 5. The rubber plate 4 sandwiched between the metal plates 3 and 5 is accommodated inside the metal plates 3 and 5 and does not protrude during vibration, so that excessive deformation of the rubber plate 4 is suppressed, and the rubber plate 4 is preferable. Deforms with uniform deflection.
図４に、タンク本体１１の鋼材１５の下面に対する制震部材２の配置の一例を模式的に示す。本実施例の制震部材２は、鋼材１５の下面の各頂点および各辺の中央を支持する合計８箇所に、互いに間隔をあけて配置される。本実施例のタンク本体１０は底面１２の各辺に沿って側面１３が接合されているので、頂点から延びる二つの辺の一部を支持することで、底面１２と側面１３の接合部分の一部を支持することができる。 In FIG. 4, an example of arrangement | positioning of the damping member 2 with respect to the lower surface of the steel material 15 of the tank main body 11 is shown typically. The vibration control members 2 of the present embodiment are arranged at a distance from each other at a total of eight locations that support the apexes of the lower surface of the steel material 15 and the centers of the sides. Since the side surface 13 of the tank body 10 of this embodiment is joined along each side of the bottom surface 12, one part of the joint portion between the bottom surface 12 and the side surface 13 is supported by supporting a part of the two sides extending from the apex. The part can be supported.
タンク本体１０に、水深２７００ｍｍとなるように水を供給し、振動試験を行った結果を、図５から図８に示す。図５から図７は、タンク１に対して、図１中の符号Ａで示した水平方向に定常波で加振を行ったときの諸特性の評価結果である。図８は、東北地方太平洋沖地震の地震波を適用して加振を行った場合の動水圧の評価結果である。図５から図８では、比較例として、タンク１から制震部材２を除去してタンク本体１０のみに対して同一条件で振動試験を行った結果を「制震部材なし」の結果として破線で示している。 FIG. 5 to FIG. 8 show the results of supplying water to the tank body 10 so that the water depth is 2700 mm and conducting a vibration test. 5 to 7 show the evaluation results of various characteristics when the tank 1 is vibrated with a standing wave in the horizontal direction indicated by the symbol A in FIG. FIG. 8 shows the evaluation results of the hydrodynamic pressure when excitation is performed by applying seismic waves of the Tohoku-Pacific Ocean Earthquake. In FIGS. 5 to 8, as a comparative example, the vibration control member 2 is removed from the tank 1 and the vibration test is performed on the tank body 10 only under the same conditions. The result of “no vibration control member” is indicated by a broken line. Show.
図５は、実施例１のタンクを定常波加振した時の入力振動数と動水圧応答の関係を示すグラフである。図５で縦軸に示した動水圧応答Ｐとは、各振動数における加振力で、最大動水圧を除した値である。図５においては、実施例１のタンクの動水圧応答Ｐを実線で示している。 FIG. 5 is a graph showing the relationship between the input frequency and the dynamic water pressure response when the tank of Example 1 is subjected to stationary wave excitation. The dynamic hydraulic pressure response P shown on the vertical axis in FIG. 5 is a value obtained by dividing the maximum dynamic hydraulic pressure by the excitation force at each frequency. In FIG. 5, the dynamic water pressure response P of the tank of Example 1 is indicated by a solid line.
図５に示したとおり、本実施例のタンク１は、制震部材のない場合と比較して、バルジングの固有振動数（最大値の現れる振動数）が、約１０／１１低周波側に移動している。さらに、タンク１のバルジングが発生したときの動水圧応答Ｐの値は、制震部材のない場合と比較すると、５／９に低減されている。制震部材２の動水圧応答の減衰効果は明らかである。 As shown in FIG. 5, in the tank 1 of this embodiment, the natural frequency of bulging (the frequency at which the maximum value appears) moves to the low frequency side by about 10/11 compared to the case without the damping member. doing. Furthermore, the value of the dynamic water pressure response P when the bulging of the tank 1 occurs is reduced to 5/9 as compared with the case where there is no damping member. The damping effect of the dynamic water pressure response of the damping member 2 is clear.
図６に、タンク１を定常波加振したときの、底面１２からのタンクの高さごとの変位δを実線で示す。図５と同様、比較のために、タンク１から制震部材２を除去してタンク本体１０のみで定常波加振を行った結果を、「制震部材なし」の結果として破線で示している。タンク１の変位は、最下部（０ｍｍ）から最上部（３０００ｍｍ）までの全ての位置で、比較例のタンク本体１１の変位δの値に対して低減されており、その値は平均４０％、最大で約６０％である。特に、水面付近の高さ２５００ｍｍ付近での変位の低減効果が大きく、制震部材２の振動の減衰効果は明らかである。 In FIG. 6, the displacement δ for each height of the tank from the bottom surface 12 when the tank 1 is subjected to stationary wave excitation is indicated by a solid line. As in FIG. 5, for comparison, the result obtained by removing the damping member 2 from the tank 1 and performing stationary wave excitation only by the tank body 10 is shown by a broken line as a result of “no damping member”. The displacement of the tank 1 is reduced with respect to the value of the displacement δ of the tank body 11 of the comparative example at all positions from the lowermost part (0 mm) to the uppermost part (3000 mm). The maximum is about 60%. In particular, the effect of reducing displacement near a height of 2500 mm near the water surface is large, and the vibration damping effect of the vibration control member 2 is clear.
図７（ａ）は、実施例１のタンクを定常波加振した時の時間に対する動水圧の経時変化を示すグラフである。図７（ｂ）は、比較例の制震部材のないタンクを定常波加振した時の時間に対する動水圧の経時変化を示すグラフである。タンク１において、周波数４．４Ｈｚ、振幅±１ｍｍの加振を行った場合の動水圧の最大値は、３．８ｋＰａであり、減衰定数Ｋ＝０．０５８２であった。一方で、比較例の制震部材のないタンクを同一条件で加振した場合、動水圧の最大値は、１０．６ｋＰａであり、減衰定数Ｋ＝０．０３９６であった。これらのことからも、制震部材２の振動の減衰効果は明らかである。 Fig.7 (a) is a graph which shows the time-dependent change of dynamic water pressure with respect to time when the tank of Example 1 is subjected to stationary wave vibration. FIG.7 (b) is a graph which shows a time-dependent change of the dynamic water pressure with respect to time when a stationary wave vibration is applied to the tank without the damping member of a comparative example. In the tank 1, the maximum value of the dynamic water pressure when the vibration with the frequency of 4.4 Hz and the amplitude of ± 1 mm was performed was 3.8 kPa, and the damping constant K = 0.0582. On the other hand, when the tank without the damping member of the comparative example was vibrated under the same conditions, the maximum value of the dynamic water pressure was 10.6 kPa, and the damping constant K = 0.0396. Also from these things, the damping effect of the vibration of the damping member 2 is clear.
図８（ａ）は、実施例１のタンクを東北地方太平洋沖地震の地震波で加振した時の動水圧の経時変化を示すグラフである。図８（ｂ）は、比較例のタンクを同一条件で加振した時の動水圧の経時変化と応答水圧スペクトルの関係を示すグラフである。実際の地震波による加振を適用した場合であっても、本実施例の制震部材２の振動の減衰効果は明らかである。 FIG. 8A is a graph showing the change over time in the dynamic water pressure when the tank of Example 1 was vibrated with an earthquake wave of the Tohoku Earthquake. FIG. 8B is a graph showing the relationship between the change in dynamic water pressure with time and the response water pressure spectrum when the tank of the comparative example is vibrated under the same conditions. Even in the case of applying excitation by actual seismic waves, the vibration damping effect of the damping member 2 of this embodiment is clear.
本実施例のタンク１は、一対の金属板３，５とゴム板４からなる制震部材２がタンク本体１１の鋼材１５の下面に間隔を開けて配置されていることで、バルジングの固有振動数が低周波側に移動し、しかもその応答動水圧が極めて小さくなっている。制震部材２の制震効果は明らかである。 In the tank 1 of the present embodiment, the vibration damping member 2 composed of a pair of metal plates 3 and 5 and a rubber plate 4 is disposed on the lower surface of the steel material 15 of the tank body 11 with a space therebetween, thereby allowing the natural vibration of bulging. The number moves to the low frequency side, and the response hydrodynamic pressure is extremely small. The damping effect of the damping member 2 is clear.
（制震部材の変形例）
本発明のタンクに適用可能な他の制震部材２’の構成の一例を、図３に示す。制震部材２’の下側金属板３と上側金属板５は、実施例１と同様の略正方形の２枚の鋼板である。金属板３，５の間に、略円形のゴム板６が挟まれている。ゴム板の直径は金属板３，５の一辺の長さより短く、ゴム板は金属板３，５の外側にはみ出すことなく設置される。
制震部材の変形例として、下側金属板３の一辺の長さを上側金属板５の一辺の長さよりも長くしたり、下側金属板３の板厚を上側金属板５の板厚よりも厚く構成することも可能である。一対の金属板を長方形または円形で構成することも可能である。
(Modification example of vibration control member)
An example of the configuration of another damping member 2 ′ applicable to the tank of the present invention is shown in FIG. The lower metal plate 3 and the upper metal plate 5 of the damping member 2 ′ are two substantially square steel plates as in the first embodiment. A substantially circular rubber plate 6 is sandwiched between the metal plates 3 and 5. The diameter of the rubber plate is shorter than the length of one side of the metal plates 3 and 5, and the rubber plate is installed without protruding outside the metal plates 3 and 5.
As a modification of the vibration control member, the length of one side of the lower metal plate 3 is made longer than the length of one side of the upper metal plate 5, or the plate thickness of the lower metal plate 3 is made larger than the plate thickness of the upper metal plate 5. It is also possible to make it thick. It is also possible to configure the pair of metal plates as a rectangle or a circle.
（制震部材の配置の変形例）
実施例１では、制震部材２の配置について、タンク本体１１の鋼材１５の下面の各頂点および各辺の中央を支持する合計８箇所に、互いに間隔をあけて配置される例を示した。しかし、制震部材２のタンクの底面積に対する相対的な大きさを実施例よりも大きくし、鋼材１５の下面の頂点の４箇所のみに配置することが可能である。また、制震部材２のタンクの底面積に対する相対的な大きさを実施例よりも小さくし、鋼材１５の下面の各辺上に２個以上配置することも可能である。
(Modification example of arrangement of damping members)
In Example 1, about the arrangement | positioning of the damping member 2, the example arrange | positioned at intervals in a total of eight places which support each vertex of the lower surface of the steel material 15 of the tank main body 11 and the center of each side was shown. However, the relative size of the vibration control member 2 with respect to the bottom area of the tank can be made larger than that of the embodiment, and the vibration control member 2 can be arranged only at the four apexes on the lower surface of the steel material 15. Further, the relative size of the damping member 2 with respect to the bottom area of the tank can be made smaller than that of the embodiment, and two or more can be arranged on each side of the lower surface of the steel material 15.
（タンク本体の変形例）
本実施例では、ステンレス鋼からなるタンクについて詳細な説明を行ったが、貯留する液体の種類や条件等により、タンクに用いる材料を、他の金属または繊維強化プラスチック（ＦＲＰ）とすることが可能である。また、実施例では立方体形状のタンクについての説明をおこなったが、タンクを直方体状や円柱状、その他の任意の形状とすることができる。さらに、側面を底面の周縁部のみに配置するだけではなく、タンクを複数の区画に分割するように底面の内側と接合して配置しても良い。その場合の制震部材は、タンクの底面と側面の接合部分を支持するように配置することが好ましい。
(Modification of tank body)
In this embodiment, a detailed description of a tank made of stainless steel has been given, but the material used for the tank can be another metal or fiber reinforced plastic (FRP) depending on the type and conditions of the liquid to be stored. It is. In the embodiment, the cubic tank has been described. However, the tank may have a rectangular parallelepiped shape, a cylindrical shape, or any other shape. Furthermore, the side surface may be disposed not only on the peripheral edge of the bottom surface, but may be disposed so as to be joined to the inside of the bottom surface so as to divide the tank into a plurality of sections. In that case, the vibration damping member is preferably arranged so as to support the joint between the bottom surface and the side surface of the tank.
１…タンク
２…制震部材
３…下側金属板
４，６…ゴム板
５…上側金属板
１１…タンク本体
１２…底面
１３…側面
１４…上面
１５…鋼材
２０…パネル
DESCRIPTION OF SYMBOLS 1 ... Tank 2 ... Damping member 3 ... Lower metal plate 4, 6 ... Rubber plate 5 ... Upper metal plate 11 ... Tank main body 12 ... Bottom surface 13 ... Side surface 14 ... Upper surface 15 ... Steel material 20 ... Panel
Claims (4)
矩形状の平板からなる底面と、前記底面に対して垂直に接合されている側面と、当該側面の上端部に配置されている上面と、を備えているタンク本体と、
前記タンク本体の前記底面の下側に互いに間隔をあけて配置されて、前記底面と前記側面との接合部分の少なくとも一部を支持する複数の制震部材と、
を備えており、
前記制震部材が、前記制震部材の上面を構成する上側金属板と前記制震部材の下面を構成する下側金属板とからなる一対の金属板と、前記上側金属板と前記下側金属板との間に設置される平板状のゴム板とを備える複合部材であることを特徴とするタンク。 A tank,
A tank body comprising a bottom surface made of a rectangular flat plate, a side surface joined perpendicularly to the bottom surface, and an upper surface disposed at the upper end of the side surface;
A plurality of vibration control members that are arranged on the lower side of the bottom surface of the tank body and spaced apart from each other to support at least a part of the joint portion between the bottom surface and the side surface;
With
The damping member is a pair of metal plates composed of an upper metal plate constituting the upper surface of the damping member and a lower metal plate constituting the lower surface of the damping member, the upper metal plate and the lower metal A tank characterized by being a composite member comprising a flat rubber plate placed between the plate and the plate.
前記ゴム板の縦方向の辺の長さが前記一対の金属板の縦方向の辺の長さより短く、且つ前記ゴム板の横方向の辺の長さが前記一対の金属板の横方向の辺の長さより短くあって、上面視で前記ゴム板が前記一対の金属板の内側に設置されていることを特徴とする請求項１に記載のタンク。 In the vibration damping member, the pair of metal plates and the rubber plate are both substantially rectangular,
The length of the longitudinal side of the rubber plate is shorter than the length of the longitudinal side of the pair of metal plates, and the length of the lateral side of the rubber plate is the lateral side of the pair of metal plates. The tank according to claim 1, wherein the rubber plate is installed inside the pair of metal plates when viewed from above.
前記ゴム板の径方向の長さが、前記一対の金属板の辺の長さより短くあって、上面視で前記ゴム板が前記一対の金属板の内側に設置されていることを特徴とする請求項１に記載のタンク。 In the vibration damping member, the pair of metal plates is substantially rectangular, and the rubber plate is substantially circular,
The length in the radial direction of the rubber plate is shorter than the length of the side of the pair of metal plates, and the rubber plate is installed inside the pair of metal plates in a top view. Item 4. The tank according to Item 1.
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| JP2021038831A (en) * | 2019-09-05 | 2021-03-11 | 株式会社ベルテクノ | Damper device or vibration control water storage tank comprising damper device |
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| JP2012251323A (en) * | 2011-06-01 | 2012-12-20 | Ihi Infrastructure Systems Co Ltd | Input discrimination device |
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| JPH1035786A (en) * | 1996-07-24 | 1998-02-10 | Bridgestone Corp | Water tank with improved vibration-resistance |
| JP2002106634A (en) * | 2000-10-04 | 2002-04-10 | Railway Technical Res Inst | Magnetic control rubber support, and structure supported by it |
| JP2012251323A (en) * | 2011-06-01 | 2012-12-20 | Ihi Infrastructure Systems Co Ltd | Input discrimination device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2021038831A (en) * | 2019-09-05 | 2021-03-11 | 株式会社ベルテクノ | Damper device or vibration control water storage tank comprising damper device |
| JP7207726B2 (en) | 2019-09-05 | 2023-01-18 | 株式会社ベルテクノ | Damping device or damping water tank equipped with this damping device |
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