JPH0585434B2 - - Google Patents
Info
- Publication number
- JPH0585434B2 JPH0585434B2 JP62221875A JP22187587A JPH0585434B2 JP H0585434 B2 JPH0585434 B2 JP H0585434B2 JP 62221875 A JP62221875 A JP 62221875A JP 22187587 A JP22187587 A JP 22187587A JP H0585434 B2 JPH0585434 B2 JP H0585434B2
- Authority
- JP
- Japan
- Prior art keywords
- floating roof
- displacement
- angular
- tank
- vertical displacement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007667 floating Methods 0.000 claims description 62
- 238000006073 displacement reaction Methods 0.000 claims description 41
- 230000001133 acceleration Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 description 6
- 238000012937 correction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003208 petroleum Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、地震時のスロツシングによる浮屋根
の上下変位を計測する浮屋根式タンクにおける浮
屋根の変位計測方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for measuring the displacement of a floating roof in a floating roof tank, which measures the vertical displacement of the floating roof due to sloshing during an earthquake.
石油等を貯蔵する浮屋根式タンクでは、地震時
の貯液のスロツシングにより浮き屋根が傾動し、
大地震では浮屋根外周部が数ｍも上下に変位する
ことがある。浮屋根の外周部の上下変位を計測で
きれば、地震時の浮屋根の保守点検などに役立て
ることができる。
In floating roof tanks that store petroleum, etc., the floating roof tilts due to sloshing of the stored liquid during an earthquake.
In a major earthquake, the outer periphery of a floating roof can move up and down by several meters. If the vertical displacement of the outer periphery of a floating roof can be measured, it will be useful for maintenance and inspection of floating roofs during earthquakes.
浮屋根外周部の上下変位の計測には、ワイヤー
型ゲージが考えられる。即ち、タンクの側板上部
に滑車を設け、滑車にワイヤーを巻き付け、ワイ
ヤーの一端を浮屋根の外周部に連結すると共にワ
イヤーの他端をタンク外側のウエイトに連結し、
浮屋根外周部の上下変位をウエイトの上下変位と
して計測する。 A wire type gauge may be used to measure the vertical displacement of the outer circumference of the floating roof. That is, a pulley is provided on the upper side of the tank, a wire is wound around the pulley, one end of the wire is connected to the outer circumference of the floating roof, and the other end of the wire is connected to a weight on the outside of the tank.
The vertical displacement of the outer circumference of the floating roof is measured as the vertical displacement of the weight.
ところが、側板上部内側に滑車等の付属品を設
置すると、スロツシングにより浮屋根の外周部が
上下し、浮屋根と付属品とがぶつかつて火花が飛
び、石油等の可然性貯液または蒸発ガスに着火し
て火災が発生するおそれがある。このため、消防
関係の法令等においても、側板上部内側に付属品
を設置することが禁止されており、上記ワイヤー
型ゲージを浮屋根の上下変位計測に採用すること
は好ましくない。
However, when accessories such as pulleys are installed inside the upper part of the side panels, the outer periphery of the floating roof moves up and down due to slotzing, causing sparks to fly when the floating roof and the accessories collide, causing possible accumulation of liquid such as petroleum or evaporative gas. may ignite and cause a fire. For this reason, fire-fighting related laws and regulations also prohibit the installation of accessories inside the upper part of the side panels, and it is not preferable to use the wire-type gauge described above to measure the vertical displacement of a floating roof.
本発明の目的は、上記従来技術の問題点を解消
し、浮屋根外周部の上下変位を簡易に計測するこ
とができる浮屋根式タンクにおける浮屋根の変位
計測方法を提供することにある。 An object of the present invention is to provide a method for measuring the displacement of a floating roof in a floating roof type tank, which solves the problems of the prior art described above and can easily measure the vertical displacement of the outer periphery of the floating roof.
本発明の浮屋根の変位計測方法は、浮屋根上に
角速度あるいは角加速度を検出するセンサを複数
設置し、これらセンサからの検出信号を時間積分
して各センサが設置された浮屋根の角変位を求
め、得られた角変位から浮屋根の外周部の上下変
位を算出する。
The floating roof displacement measuring method of the present invention includes installing a plurality of sensors on the floating roof to detect angular velocity or angular acceleration, and integrating the detection signals from these sensors over time to determine the angular displacement of the floating roof on which each sensor is installed. The vertical displacement of the outer periphery of the floating roof is calculated from the obtained angular displacement.
センサにより浮屋根の角速度あるいは角加速度
が検出される。検出された角速度あるいは角加速
度は時間積分されて角変位が求められる。得られ
た浮屋根の複数箇所の角変位には、浮屋根の撓み
を考慮した係数が掛けられ、浮屋根の外周部の上
下変位が算出される。
The sensor detects the angular velocity or acceleration of the floating roof. The detected angular velocity or angular acceleration is time-integrated to obtain angular displacement. The obtained angular displacements at multiple locations on the floating roof are multiplied by a coefficient that takes into account the deflection of the floating roof, and the vertical displacement of the outer periphery of the floating roof is calculated.
以下に、本発明の実施例を図面を用いて説明す
る。
Embodiments of the present invention will be described below with reference to the drawings.
第１図、第２図において、１は有底円筒状で石
油等を貯蔵するタンクである。タンク１は底板２
と側板３とを有する。タンク１内には貯液の揮発
成分の蒸発を押えるために、貯液面に浮かび貯液
の増減にしたがつて上下する浮屋根４が設けられ
ている。浮屋根４は、上部デツキと下部デツキの
間に円周方向および半径方向に区画板が設けられ
たダブルデツキ型のものである。 In FIGS. 1 and 2, 1 is a cylindrical tank with a bottom for storing oil and the like. Tank 1 is bottom plate 2
and a side plate 3. In order to suppress the evaporation of volatile components of the stored liquid, a floating roof 4 is provided inside the tank 1, which floats on the liquid storage surface and moves up and down as the stored liquid increases and decreases. The floating roof 4 is of a double deck type in which dividing plates are provided in the circumferential direction and the radial direction between the upper deck and the lower deck.
浮屋根４の上面には、第２図中、白丸で示す位
置に浮屋根４の各部の角速度あるいは角加速度を
検出するセンサ５1，５2，５3，５4が設けられて
いる。センサ５1は浮屋根４の中心にセンサ５2，
５3，５4は浮屋根４の外周部に45゜間隔で設置さ
れている。センサ５1〜５4の検出信号は図示省略
のデータレコーダに一旦記録しておき、地震が起
つた後に地震時のデータを取り出して解析を行な
う。 Sensors 5 1 , 5 2 , 5 3 , and 5 4 for detecting the angular velocity or angular acceleration of each part of the floating roof 4 are provided on the upper surface of the floating roof 4 at positions indicated by white circles in FIG. Sensor 5 1 is located at the center of floating roof 4, sensor 5 2 ,
5 3 and 5 4 are installed on the outer periphery of the floating roof 4 at 45° intervals. Detection signals from the sensors 5 1 to 5 4 are temporarily recorded on a data recorder (not shown), and after an earthquake occurs, the earthquake data is extracted and analyzed.
解析にあたつては、まずセンサ５1〜５4が検出
した角速度（角加速度）を一回（または二回）時
間積分して角変位を算出する。次にセンサ５1の
角変位θ1とセンサ５2の角変位θ2から、０度方向
の浮屋根外周部の上下変位Y0を算出する。浮屋
根４はダブルデツキタイプであつて剛性が高いの
で、角変位θ1とθ2とは略同一の値であり、上下変
位Y0は、浮屋根４の半径をｒとすると、rsinθ1で
求められる。しかし、浮屋根４も多少サインカー
ブ状に撓むので、浮屋根４の構造解析によつて撓
みによる修正も考慮した修正係数C1，C2を予め
算出しておき、次式よりY0を算出する。 In the analysis, first, the angular velocity (angular acceleration) detected by the sensors 5 1 to 5 4 is time-integrated once (or twice) to calculate the angular displacement. Next, from the angular displacement θ 1 of the sensor 5 1 and the angular displacement θ 2 of the sensor 5 2 , the vertical displacement Y 0 of the outer peripheral portion of the floating roof in the 0 degree direction is calculated. Since the floating roof 4 is a double deck type and has high rigidity, the angular displacements θ 1 and θ 2 are approximately the same value, and the vertical displacement Y 0 is rsinθ 1 , where r is the radius of the floating roof 4. Desired. However, since the floating roof 4 also bends somewhat in a sine curve shape, the correction coefficients C 1 and C 2 that take into account corrections due to deflection are calculated in advance by structural analysis of the floating roof 4, and Y 0 is calculated using the following formula. calculate.
Y0＝C1θ2＋C2θ2
同様にして、45度方向、90度方向の浮屋根外周
部の上下変位Y45，Y90を算出する。そしてこれ
ら上下変位Y0，Y45，Y90から最大上下変位を算
定する。円周方向のセンサ５2，５3，５4の数を
増やすほど、最大上下変位の算出精度が高くな
る。なお、例えばセンサ５3を225度方向の外周部
に設置するようにしてもよい。 Y 0 =C 1 θ 2 +C 2 θ 2 Similarly, calculate the vertical displacements Y 45 and Y 90 of the outer circumference of the floating roof in the 45-degree direction and the 90-degree direction. Then, the maximum vertical displacement is calculated from these vertical displacements Y 0 , Y 45 , and Y 90 . As the number of sensors 5 2 , 5 3 , 5 4 in the circumferential direction increases, the accuracy of calculating the maximum vertical displacement increases. Note that, for example, the sensor 53 may be installed on the outer periphery in the 225 degree direction.
次に、第３図に示すシングルデツキ型の浮屋根
６に適用した例を述べる。 Next, an example in which the present invention is applied to a single deck type floating roof 6 shown in FIG. 3 will be described.
シングルデツキ型の浮屋根６は、一枚板のデツ
キの外周部に環状のポンツーン７を設けたもの
で、ポンツーン７の浮力により浮くようになつて
いる。シングルデツキ型は一枚板構造で柔軟性が
あるため、地震時の貯液の１次モードの波面によ
つて図示のようにサインカーブ状に変形する。そ
こで、ダブルデツキ型の浮屋根４の場合のよう
に、浮屋根４の中心および外周のみならず、第２
図中、黒丸で示すように中間の位置にもセンサ５
５，５6，５7を設置する。そうして、浮屋根６の
撓みを考慮した修正係数Ｃを用いて、例えば０度
方向の浮屋根６の上下変位Y0を次式により求め
る。 The single deck type floating roof 6 has an annular pontoon 7 provided on the outer periphery of a single deck, and is made to float due to the buoyancy of the pontoon 7. Since the single deck type has a single plate structure and is flexible, it deforms into a sine curve shape as shown in the figure by the wavefront of the first mode of the stored liquid during an earthquake. Therefore, as in the case of a double deck type floating roof 4, not only the center and outer periphery of the floating roof 4 but also the second
In the figure, as shown by the black circle, there is also a sensor 5 in the middle position.
Set up 5 , 5 6 , and 5 7 . Then, using a correction coefficient C that takes into account the deflection of the floating roof 6, the vertical displacement Y0 of the floating roof 6 in the 0 degree direction, for example, is determined by the following equation.
Y0＝C1θ1＋C2θ2＋C3θ3
浮屋根の角変位は、これを直接計る角変位計で
計測する方法も考えられる。しかし、角変位計は
振子型のもので水平方向の地震動による浮屋根の
回転（ローリング）振動のみならず上下方向の地
震動の影響も拾つてしまうため、精度が悪い。こ
れに対し、シーソー型の角速度センサや角加速度
センサは回転方向の振動だけを検知するので精度
がよい。また、浮屋根の上下変位を求めるため
に、ジヤイロを用いることも考えられるが、ジヤ
イロは高価であり、コストアツプとなり経済性の
面から採用し難い。 Y 0 =C 1 θ 1 +C 2 θ 2 +C 3 θ 3It is also possible to measure the angular displacement of the floating roof using an angular displacement meter that directly measures it. However, the angular displacement meter is of a pendulum type and picks up not only the rotational (rolling) vibration of the floating roof due to horizontal seismic motion, but also the effects of vertical seismic motion, so its accuracy is poor. On the other hand, seesaw-type angular velocity sensors and angular acceleration sensors have good accuracy because they detect only vibrations in the rotational direction. Furthermore, it is possible to use a gyroscope to determine the vertical displacement of the floating roof, but the gyroscope is expensive and increases the cost, making it difficult to employ from an economic standpoint.
なお、上記実施例では浮屋根の同一半径上の複
数の角変位から浮屋根外周部の上下変位を算出し
たが、角変位θの分布から浮屋根の曲げ撓みを算
出することもできる。 In the above embodiment, the vertical displacement of the outer circumference of the floating roof is calculated from a plurality of angular displacements on the same radius of the floating roof, but the bending deflection of the floating roof can also be calculated from the distribution of angular displacements θ.
本発明によれば、タンク側板にではなく、浮屋
根上に角速度あるいは角加速度のセンサを設置
し、その信号処理により浮屋根外周部の上下変位
を求めるようにしているため、火災の発生等のお
それがなく、また計測装置も小型・軽量で且つ安
価なものとなる。
According to the present invention, an angular velocity or angular acceleration sensor is installed on the floating roof instead of on the tank side plate, and the vertical displacement of the outer circumference of the floating roof is determined by signal processing, thereby preventing the occurrence of a fire, etc. There is no fear, and the measuring device is also small, lightweight, and inexpensive.
第１図は本発明に係る変位計測方法をダブルデ
ツキ型の浮屋根に適用した場合の一例を示す浮屋
根式タンクの概略正面断面図、第２図は同タンク
の平面図、第３図は本発明をシングルデツキ型の
浮屋根に適用した場合の一例を示す浮屋根式タン
クの概略正面断面図である。
図中、１はタンク、２は底板、３は側板、４は
ダブルデツキ型の浮屋根、５はセンサ、６はシン
グルデツキ型の浮屋根、７はポンツーン、θは角
変位である。
Fig. 1 is a schematic front sectional view of a floating roof tank showing an example of applying the displacement measurement method according to the present invention to a double deck type floating roof, Fig. 2 is a plan view of the tank, and Fig. 3 is a main part of this tank. 1 is a schematic front sectional view of a floating roof type tank showing an example of the case where the invention is applied to a single deck type floating roof. In the figure, 1 is a tank, 2 is a bottom plate, 3 is a side plate, 4 is a double deck type floating roof, 5 is a sensor, 6 is a single deck type floating roof, 7 is a pontoon, and θ is an angular displacement.
Claims (1)
るセンサを複数設置し、これらセンサからの検出
信号を時間積分して各センサが設置された浮屋根
の角変位を求め、得られた角変位から浮屋根の外
周部の上下変位を算出するようにしたことを特徴
とする浮屋根式タンクにおける浮屋根の変位計測
方法。1 Install multiple sensors on the floating roof to detect angular velocity or angular acceleration, time-integrate the detection signals from these sensors to determine the angular displacement of the floating roof on which each sensor is installed, and calculate the floating roof from the obtained angular displacement. A method for measuring the displacement of a floating roof in a floating roof tank, characterized in that the vertical displacement of the outer periphery of the roof is calculated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62221875A JPS6470395A (en) | 1987-09-07 | 1987-09-07 | Displacement calculation method of floating roof in floating roof tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62221875A JPS6470395A (en) | 1987-09-07 | 1987-09-07 | Displacement calculation method of floating roof in floating roof tank |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6470395A JPS6470395A (en) | 1989-03-15 |
| JPH0585434B2 true JPH0585434B2 (en) | 1993-12-07 |
Family
ID=16773552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62221875A Granted JPS6470395A (en) | 1987-09-07 | 1987-09-07 | Displacement calculation method of floating roof in floating roof tank |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6470395A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200404485A (en) | 2002-05-22 | 2004-03-16 | Assembleon Nv | Method of placing a component by means of a placement device at a desired position on a substrate holder, and device suitable for performing such a method |
| JP4552110B2 (en) * | 2004-02-05 | 2010-09-29 | 株式会社Ｉｈｉ | Tank float roof strength evaluation method |
| CA2719431C (en) * | 2008-03-31 | 2015-01-27 | Syscor Research & Development Inc. | Apparatus for the wireless remote monitoring of storage tank roofs |
-
1987
- 1987-09-07 JP JP62221875A patent/JPS6470395A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6470395A (en) | 1989-03-15 |
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