JP2003054486A - Drag reducing device for offshore structure including pillar shaped member - Google Patents
Drag reducing device for offshore structure including pillar shaped memberInfo
- Publication number
- JP2003054486A JP2003054486A JP2001247629A JP2001247629A JP2003054486A JP 2003054486 A JP2003054486 A JP 2003054486A JP 2001247629 A JP2001247629 A JP 2001247629A JP 2001247629 A JP2001247629 A JP 2001247629A JP 2003054486 A JP2003054486 A JP 2003054486A
- Authority
- JP
- Japan
- Prior art keywords
- cover
- columnar member
- flow
- arrow
- shape
- 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.)
- Granted
Links
Landscapes
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、スパーブイやスパ
ーブイ型ボーリング櫓、海洋上の作業に用いられるプラ
ットホームなど、水中に設置されている柱状部材を有す
る海洋構造物が潮流や波浪などにより傾くのを低減させ
たり、流体による抗力を低減させるための装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spar buoy, a spar buoy type boring turret, a platform used for offshore work, and the like. The present invention relates to a device for reducing or reducing a drag force caused by a fluid.
【０００２】[0002]
【従来の技術】例えば、「急潮流用スパーブイ」と呼ば
れている引き込み係留式棒状ブイは、断面円形の円柱状
部材と円筒形もしくは球状の浮力体との組み合わせで本
体が構成されている。このブイあるいはこのブイを用い
ているボーリング櫓が潮流や波浪などにより傾くのを低
減させるために、従来は、浮力体の直径および高さを単
に大きくし（すなわち、サイズアップし）、浮力を大き
くする方式を採っていた。また、海洋上の作業に用いら
れるプラットホームは水中で傾くことはないが、潮流や
波浪が大きくなればなるほど流体による抗力が増大す
る。2. Description of the Related Art For example, a retractable mooring rod-shaped buoy referred to as a "surge buoy" is constructed by combining a cylindrical member having a circular cross section and a buoyant body having a cylindrical or spherical shape. In order to reduce the tilt of this buoy or the boring turret using this buoy due to tidal currents and waves, conventionally, the diameter and height of the buoyant body were simply increased (that is, increased in size) to increase the buoyancy. I adopted the method of doing. Although the platform used for offshore work does not tilt in water, the drag force of the fluid increases as the tidal current and waves increase.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、海洋構造物
の柱状部材に特殊形状のカバーを取り付け、その長軸が
自動的に流れに平行になるようにすることにより、海洋
構造物が水中で受ける流体による抗力を低減させ得るよ
うにしたものである。DISCLOSURE OF THE INVENTION According to the present invention, a cover having a special shape is attached to a columnar member of an offshore structure so that its long axis is automatically parallel to the flow, so that the offshore structure is underwater. It is intended to reduce the drag force exerted by the fluid received at.
【０００４】[0004]
【課題を解決するための手段】上記目的は、図１(a) の
原理図に示すように、楕円形、長円形もしくはそれらに
類似する形状のカバー１を、海洋構造物の柱状部材２に
対してスライド可能に設けることによって、達成するこ
とができる。水中に設置されている海洋構造物が図１
(a) の矢印(1) 方向から潮流や波浪を受ける場合には、
楕円形、長円形もしくはそれらに類似する形状のカバー
１の長軸は流れに並行であり、そのカバー１は柱状部材
２に対し図１(a) の右側にスライドして図１(a) の状態
となり、流れ中の抗力を大幅に低減させることができ
る。逆に、流れが１８０°転流しても、すなわち、図１
(a) の矢印(1) 方向と正反対の方向から潮流や波浪を受
ける場合には、カバー１が図１(a) の状態から左側にス
ライドし、先程の場合と同じように流れ中の抗力を大幅
に低減させることができる。As shown in the principle diagram of FIG. 1 (a), the above-mentioned object is to provide a cover 1 having an elliptical shape, an oval shape, or a shape similar to them to a columnar member 2 of a marine structure. It can be achieved by being slidable relative to it. Figure 1 shows an offshore structure installed underwater.
When receiving tidal current or waves from the direction of arrow (1) of (a),
The major axis of the cover 1 having an elliptical shape, an oval shape or the like is parallel to the flow, and the cover 1 is slid to the right side of FIG. It becomes a state, and the drag force in the flow can be significantly reduced. Conversely, even if the flow commutates 180 °, that is, as shown in FIG.
When a tidal current or a wave is received from the direction opposite to the arrow (1) of (a), the cover 1 slides to the left from the state of Fig. 1 (a), and the drag force in the flow is the same as the previous case. Can be significantly reduced.
【０００５】また、上記目的は、図１(b) の原理図に示
すように、楕円形、長円形もしくはそれらに類似する形
状のカバー１を、海洋構造物の円柱状部材２に対して回
転可能に設けることによっても、達成することができ
る。この場合にも、カバー１を流れに追従させることが
できる。すなわち、図１(b)の矢印(1) から矢印(2) に
流れが変わると、カバー１は柱状部材２に対して矢印で
示すように回転して鎖線で示す状態となり、この場合に
も、流れ中の抗力を大幅に低減させることができる。Further, as shown in the principle diagram of FIG. 1 (b), the above-mentioned object is to rotate a cover 1 having an elliptical shape, an oval shape or a shape similar to the elliptical shape, with respect to a cylindrical member 2 of a marine structure. It can also be achieved by providing as much as possible. Also in this case, the cover 1 can follow the flow. That is, when the flow changes from the arrow (1) to the arrow (2) in FIG. 1 (b), the cover 1 rotates with respect to the columnar member 2 as shown by the arrow and becomes a state shown by a chain line. , The drag force in the flow can be significantly reduced.
【０００６】さらに、上記目的は、図１(c) の原理図に
示すように、楕円形、長円形もしくはそれらに類似する
形状のカバー１を、海洋構造物の柱状部材２に対してス
ライドならびに回転可能に設けることによっても、達成
することができる。この場合には、カバー１が柱状部材
２に対してスライドするのに加えて、カバー１を流れに
追従させることができる。すなわち、図１(c) の矢印
(1) 方向から潮流や波浪を受ける場合には、カバー１は
上述した場合と同様にスライドする。一方、図１(c) の
矢印(1) から矢印(2) に示すように流れが変わると、カ
バー１は柱状部材２に対して矢印で示すように回転して
鎖線で示す状態となり、この場合にも、流れ中の抗力を
大幅に低減させることができる。Further, as shown in the principle diagram of FIG. 1 (c), the above-mentioned purpose is to slide a cover 1 having an elliptical shape, an oval shape or a shape similar to the elliptical shape, with respect to a columnar member 2 of an offshore structure. It can also be achieved by providing it rotatably. In this case, in addition to the cover 1 sliding with respect to the columnar member 2, the cover 1 can be made to follow the flow. That is, the arrow in Fig. 1 (c)
(1) When receiving a tidal current or a wave from the direction, the cover 1 slides as in the case described above. On the other hand, when the flow changes from the arrow (1) to the arrow (2) in FIG. 1 (c), the cover 1 rotates with respect to the columnar member 2 as shown by the arrow, and becomes the state shown by the chain line. Also in this case, the drag force in the flow can be significantly reduced.
【０００７】このように、楕円形、長円形もしくはそれ
らに類似する形状のカバー１を、海洋構造物の柱状部材
２に対してスライド可能に、あるいは、回転可能に、あ
るいは、スライドならびに回転可能に設けることによっ
て、潮流や波浪などによる流れ中の抗力を大幅に低減さ
せることができる。このカバー１には、潮流や波浪など
による流れ中の抗力を低減させる以外にもう一つの機能
がある。すなわち、海洋構造物の柱状部材２の後流渦で
自励振動が生じることに起因する流れに直角方向の振動
を防ぐことができる。これにより、例えば、図11に示す
急潮流用スパーブイ型ボーリング櫓のように細長い海洋
構造物の姿勢を流れ中で直立安定させることが可能とな
る。As described above, the cover 1 having an elliptical shape, an oval shape or the like can be slidably or rotatably or slidably and rotatably with respect to the columnar member 2 of the marine structure. By providing it, the drag force in the flow due to the tidal current or the wave can be significantly reduced. The cover 1 has another function in addition to reducing drag in the flow due to tidal currents and waves. That is, it is possible to prevent the vibration in the direction perpendicular to the flow due to the self-excited vibration occurring in the wake vortex of the columnar member 2 of the marine structure. As a result, for example, it becomes possible to stabilize the posture of an elongated marine structure upright and stable in the flow, such as a spar buoy type boring turret for a rapid flow shown in FIG.
【０００８】柱状部材２の軸方向に対してカバー１，１
を上下に分割して取り付けることが望ましい。このよう
にすると、海洋構造物の設置場所における地形状況など
により、潮流や波浪などによる流向が水深方向において
異なる場合でも、上下に分割して取り付けられている各
カバー１，１をその水深での流向に自動的に対応させる
ことができる。Covers 1 and 1 with respect to the axial direction of the columnar member 2.
It is desirable to install it separately. By doing this, even if the flow direction due to tidal currents or waves differs in the water depth direction due to the topographical conditions at the installation location of the offshore structure, the covers 1 and 1 that are installed separately at the top and bottom are installed at that water depth. The flow direction can be automatically adjusted.
【０００９】カバー１の先端部及び後端部に、紐状物な
いし帯状物３を取り付けておくのが望ましい。このよう
にすると、海洋構造物の設置場所での潮流や波浪などに
よる流れにより、カバー１の先端部及び後端部に取り付
けられている紐状物ないし帯状物３が翻り、柱状部材２
に対するカバー１のスライド動作が容易かつスムーズに
なるだけでなく、カバー１を流れに並行になりやすくす
ることができる。It is desirable to attach a string-like object or a band-like object 3 to the front end and the rear end of the cover 1. By doing so, the string-shaped or strip-shaped material 3 attached to the front end portion and the rear end portion of the cover 1 is fluttered by the flow of tidal current or waves at the installation location of the offshore structure, and the columnar member 2
Not only can the sliding operation of the cover 1 with respect to [1] be easy and smooth, but also the cover 1 can be easily made parallel to the flow.
【００１０】[0010]
【発明の実施の形態】本発明の好ましい実施の形態を、
図面に基いて詳細に説明する。本発明における柱状部材
２とは、ここに例示されているように断面円形の円柱形
であることが最適であり、また、断面円形に近ければ近
いほど好ましいであろうが、例えば、断面四角形の柱状
部材の場合でも本発明にいう『抗力の低減』は少なくと
も達成し得るであろう。また、本発明の抗力低減装置
は、スパーブイやスパーブイ型ボーリング櫓（図２〜図
１１に例示されている）に適用できるほか、海洋上の作
業に用いられるプラットホーム（図１２に例示されてい
る）など、水中に設置される様々な海洋構造物に広く適
用することができる。BEST MODE FOR CARRYING OUT THE INVENTION
It will be described in detail with reference to the drawings. The columnar member 2 in the present invention is optimally a cylinder having a circular cross section as illustrated here, and the closer it is to the circular cross section, the more preferable it is. Even in the case of a columnar member, at least the "reduction of drag" in the present invention can be achieved. Further, the drag reducing device of the present invention can be applied to a spar buoy and a spar buoy type boring turret (exemplified in FIGS. 2 to 11), and a platform used for marine work (exemplified in FIG. 12). It can be widely applied to various offshore structures installed underwater.
【００１１】図１(a) は、楕円形、長円形もしくはそれ
らに類似する形状のカバー１を、海洋構造物の円柱形の
柱状部材２に対してスライド可能に設けた場合（本発明
の第一の実施の形態）の原理図である。水中に設置され
ている海洋構造物が図１(a) の矢印方向から潮流や波浪
を受ける場合には、楕円形、長円形もしくはそれらに類
似する形状のカバー１の長軸は流れに並行であり、その
カバー１は円柱形の柱状部材２に対し図１(a) の右側へ
スライドして図１(a) の状態となり、流れ中の抗力を大
幅に低減させることができる。逆に、流れが１８０°転
流しても、すなわち、図１(a) の矢印方向と正反対の方
向から潮流や波浪を受ける場合には、カバー１が図１
(a) の状態から左側にスライドし、先程の場合と同じよ
うに流れ中の抗力を大幅に低減させることができる。FIG. 1 (a) shows a case in which a cover 1 having an elliptical shape, an oval shape or a shape similar thereto is provided slidably with respect to a cylindrical columnar member 2 of an offshore structure (the first embodiment of the present invention. FIG. 3 is a principle diagram of one embodiment). When an offshore structure installed in water receives tidal currents or waves from the direction of the arrow in Fig. 1 (a), the major axis of the cover 1 of elliptical shape, oval shape or similar shape is parallel to the flow. The cover 1 is slid to the right side of FIG. 1 (a) with respect to the columnar member 2 having a cylindrical shape to be in the state of FIG. 1 (a), and the drag force in the flow can be greatly reduced. On the contrary, if the flow is commutated by 180 °, that is, if the tidal current or wave is received from the direction opposite to the arrow in FIG.
By sliding to the left from the state of (a), the drag force in the flow can be greatly reduced as in the previous case.
【００１２】図２〜図４に、海洋構造物の円柱形の柱状
部材２に対しカバー１をスライド可能ならしめるための
具体例を示す。ここには、カバー１の長手方向両側に長
手方向に沿う長孔1a，1aを形成し、両長孔1a，1aに対応
するごとく円柱形の柱状部材２に取り付けた前後一対の
ローラ2a，2aを前記両長孔1a，1a内に位置させた場合を
例示する。図２(a) あるいは図２(b) の矢印方向から潮
流や波浪を受けると、円柱形の柱状部材２に取り付けら
れている前後一対のローラ2a，2aが転動し、流れに並行
であるカバー１は図２(a) の右側あるいは図２(b) の左
側へスライドし、それぞれの図に示す状態となる。2 to 4 show a concrete example for making the cover 1 slidable with respect to the cylindrical columnar member 2 of the marine structure. Here, long holes 1a, 1a along the longitudinal direction are formed on both sides of the cover 1 in the longitudinal direction, and a pair of front and rear rollers 2a, 2a attached to a cylindrical columnar member 2 corresponding to the long holes 1a, 1a. An example is shown in which is located in both the long holes 1a, 1a. When a tidal current or a wave is received from the direction of the arrow in FIG. 2 (a) or FIG. 2 (b), the pair of front and rear rollers 2a, 2a attached to the columnar member 2 in a cylindrical shape rolls and is parallel to the flow. The cover 1 slides to the right side of FIG. 2 (a) or the left side of FIG. 2 (b), and becomes the state shown in each figure.
【００１３】前記カバー１は合成樹脂、例えば、ＦＲＰ
製とすることができる。図３、図４に示すように、カバ
ー１のうち長孔1a付近を肉厚として長孔1aを補強してお
くとよい。また、ローラ2aも合成樹脂製とすることがで
きる。なお、図２、図３における符号1bは、カバー１の
前後において長手方向両側に跨がるごとく配置したスト
ッパーで、カバー１がそれ以上スライドしないようにす
るためのものである。カバー１の補強の役もする。ま
た、符号1cは前後一対のローラ2a，2aを円柱形の柱状部
材２に取り付けるためのブラケットである。The cover 1 is made of synthetic resin such as FRP.
Can be made. As shown in FIGS. 3 and 4, it is preferable to reinforce the long hole 1a by making the vicinity of the long hole 1a of the cover 1 thick. Further, the roller 2a can also be made of synthetic resin. Reference numeral 1b in FIGS. 2 and 3 is a stopper arranged so as to straddle both sides in the longitudinal direction in the front and rear of the cover 1 to prevent the cover 1 from sliding further. It also serves to reinforce the cover 1. Reference numeral 1c is a bracket for attaching the pair of front and rear rollers 2a, 2a to the columnar member 2 having a cylindrical shape.
【００１４】図１(b) は、楕円形、長円形もしくはそれ
らに類似する形状のカバー１を、海洋構造物の円柱形の
柱状部材２に対して回転可能に設けた場合（本発明の第
二の実施の形態）の原理図である。この場合にも、カバ
ー１を流れに追従させることができる。すなわち、図１
(b)の矢印(1) から矢印(2) に流れが変わると、カバー
１は円柱形の柱状部材２に対して矢印で示すように回転
して鎖線で示す状態となり、この場合にも、流れ中の抗
力を大幅に低減させることができる。FIG. 1 (b) shows a case where a cover 1 having an elliptical shape, an oval shape or a shape similar thereto is rotatably provided with respect to a cylindrical columnar member 2 of an offshore structure (the first embodiment of the present invention. It is a principle diagram of the second embodiment). Also in this case, the cover 1 can follow the flow. That is, FIG.
When the flow changes from the arrow (1) to the arrow (2) in (b), the cover 1 is rotated with respect to the cylindrical columnar member 2 as shown by the arrow to be in the state shown by the chain line. The drag in the flow can be significantly reduced.
【００１５】図５に、海洋構造物の円柱形の柱状部材２
に対しカバー１を回転可能ならしめるための具体例を示
す。ここには、前記柱状部材２の外周囲に回転可能に取
り付けた回転バンド2cに、略半紡錘形状のカバー１を取
り付けた場合を例示する。すなわち、この回転バンド2c
は円柱形の前記柱状部材２の外周から等間隔で突出配置
されている４つのローラ2c，2cにより、前記柱状部材２
の外周方を回転させることができる。図５(a) の矢印
(1) から矢印(2) に流れが変わると、円柱形の柱状部材
２の外周から等間隔で突出配置されている４つのローラ
2c，2cの外側をカバー１が回転し、同図の矢印で示すよ
うにカバー１を流れに追従させることができる。この場
合のカバー１はフレキシブル素材、例えば、ゴム板から
なるものとすることができる。図示はしないが、カバー
１のうち流れの下流側に相当する部分（尖った部分）に
窓孔を形成するなどして流れに対する抵抗が減るように
工夫するとよい。なお、図５に例示するカバー１の形状
は略半紡錘形であるが、この形状は楕円形もしくは長円
形に類似する形状の一つということができるものであ
る。カバー１の形状を楕円形もしくは長円形そのものと
してもよいことは勿論である。FIG. 5 shows a cylindrical columnar member 2 of a marine structure.
On the other hand, a specific example for making the cover 1 rotatable is shown. Here, the case where the cover 1 having a substantially semi-spindle shape is attached to the rotation band 2c rotatably attached to the outer periphery of the columnar member 2 is illustrated. That is, this rotation band 2c
Is formed by four rollers 2c, 2c which are arranged so as to project from the outer periphery of the columnar member 2 in a columnar shape at equal intervals.
The outer periphery of the can be rotated. Arrow in Figure 5 (a)
When the flow changes from (1) to arrow (2), the four rollers are arranged so as to project from the outer periphery of the cylindrical columnar member 2 at equal intervals.
The cover 1 rotates on the outside of 2c and 2c, and the cover 1 can be made to follow the flow as shown by the arrow in the figure. In this case, the cover 1 can be made of a flexible material, for example, a rubber plate. Although not shown, it is advisable to devise the cover 1 so as to reduce the resistance to the flow by forming a window hole in a portion (pointed portion) corresponding to the downstream side of the flow. The shape of the cover 1 illustrated in FIG. 5 is a substantially semi-spindle shape, but this shape can be said to be one of shapes similar to an ellipse or an ellipse. It goes without saying that the shape of the cover 1 may be an ellipse or an oval itself.
【００１６】図１(c) は、楕円形、長円形もしくはそれ
らに類似する形状のカバー１を、海洋構造物の円柱形の
柱状部材２に対してスライドならびに回転可能に設けた
場合（本発明の第三の実施の形態）の原理図である。こ
の場合には、カバー１が円柱形の柱状部材２に対してス
ライドするのに加えて、カバー１を流れに追従させるこ
とができる。すなわち、図１(c) の矢印(1) 方向から潮
流や波浪を受ける場合には、カバー１は上述した場合と
同様にスライドする。一方、図１(c) の矢印(1) から矢
印(2) に示すように流れが変わると、カバー１は円柱形
の柱状部材２に対して矢印で示すように回転して鎖線で
示す状態となり、この場合にも、流れ中の抗力を大幅に
低減させることができる。FIG. 1 (c) shows a case in which a cover 1 having an elliptical shape, an oval shape or a shape similar thereto is provided so as to be slidable and rotatable with respect to a cylindrical columnar member 2 of an offshore structure (the present invention. 3 is a principle diagram of a third embodiment). In this case, in addition to the cover 1 sliding with respect to the cylindrical columnar member 2, the cover 1 can be made to follow the flow. That is, when receiving a tidal current or a wave from the direction of the arrow (1) in FIG. 1 (c), the cover 1 slides similarly to the case described above. On the other hand, when the flow changes from the arrow (1) to the arrow (2) in FIG. 1 (c), the cover 1 rotates with respect to the cylindrical columnar member 2 as shown by the arrow and is shown by a chain line. Therefore, also in this case, the drag force in the flow can be significantly reduced.
【００１７】図６、図７に、海洋構造物の円柱形の柱状
部材２に対しカバー１をスライドならびに回転可能なら
しめるための２つの具体例を示す。なお、図８は図７に
示すものをさらに詳細に示したものである。図６には、
楕円形、長円形もしくはそれらに類似する形状のカバー
１の前後二カ所を平面真円形に膨出させ、両膨出部1d，
1d以外の部分をそれより間隔の狭い前後に並行のスライ
ド壁1e，1eとする一方、前記スライド壁1e，1e間の距離
よりわずかに小さい平坦面を両側に有し、それら以外の
部分は前記膨出部1dの内径よりわずかに小さい円弧面を
有するすべり部材2bを円柱形の柱状部材２の外周面に装
着した場合を例示する。FIGS. 6 and 7 show two specific examples for allowing the cover 1 to slide and rotate with respect to the cylindrical columnar member 2 of the marine structure. Note that FIG. 8 shows the details shown in FIG. 7 in more detail. In Figure 6,
The front and rear two places of the cover 1 having an oval shape, an oval shape, or a shape similar to those are bulged to form a true circle in a plane, and both bulged portions 1d,
The portions other than 1d are parallel to the front and rear slide walls 1e and 1e having a narrower interval, while the flat portions on both sides are slightly smaller than the distance between the slide walls 1e and 1e, and the other portions are the same as the above. A case where the sliding member 2b having an arc surface slightly smaller than the inner diameter of the bulging portion 1d is attached to the outer peripheral surface of the columnar member 2 having a cylindrical shape will be exemplified.
【００１８】この場合には、カバー１が円柱形の柱状部
材２に対してスライドするのに加えて、カバー１を流れ
に追従させることができる。すなわち、図６(a) あるい
は図６(b) の矢印(1) 方向から潮流や波浪を受ける場合
には、カバー１の膨出部1d，1d間のスライド壁1e，1eが
円柱形の柱状部材２の外周面に装着されているすべり部
材2bの両側の平坦面に誘導され、流れに並行であるカバ
ー１は図６(a) の右側あるいは図６(b) の左側へスライ
ドし、それぞれの図に示す状態となる。一方、図６(a)
あるいは図６(b) の矢印(1) から矢印(2) に示すように
流れが変わると、カバー１の膨出部1dが円柱形の柱状部
材２の外周面に装着されているすべり部材2bの円弧面に
誘導され、カバー１は図６(a) あるいは図６(b) の矢印
で示すように円柱形の柱状部材２を中心に回転し、この
場合にも、流れ中の抗力を大幅に低減させることができ
る。なお、この場合のカバー１も合成樹脂、例えば、Ｆ
ＲＰ製とすることができ、また、すべり部材2bも合成樹
脂製とすることができる。In this case, in addition to the cover 1 sliding with respect to the cylindrical columnar member 2, the cover 1 can be made to follow the flow. That is, when receiving a tidal current or a wave from the direction of arrow (1) in FIG. 6 (a) or FIG. 6 (b), the slide walls 1e, 1e between the bulging portions 1d, 1d of the cover 1 have a columnar shape. The cover 1, which is guided to the flat surfaces on both sides of the sliding member 2b mounted on the outer peripheral surface of the member 2 and is parallel to the flow, slides to the right side of FIG. 6 (a) or the left side of FIG. 6 (b), respectively. The state shown in FIG. On the other hand, FIG. 6 (a)
Alternatively, when the flow changes from the arrow (1) to the arrow (2) in FIG. 6 (b), the swelling portion 1d of the cover 1 is attached to the outer peripheral surface of the columnar columnar member 2 and the sliding member 2b is attached. Guided by the circular arc surface of, the cover 1 rotates around the cylindrical columnar member 2 as shown by the arrow in FIG. 6 (a) or 6 (b), and in this case also, the drag force in the flow is greatly increased. Can be reduced to The cover 1 in this case is also made of synthetic resin such as F.
It can be made of RP, and the sliding member 2b can also be made of synthetic resin.
【００１９】図７、図８には、図６に示す場合と異なる
別の具体例を示す。すなわち、海洋構造物の円柱形の柱
状部材２に対しカバー１をスライドならびに回転可能な
らしめるために、両図に詳示するように、カバー１の長
手方向両側に長手方向に沿う長孔1f，1fを形成し、ま
た、カバー１内であって円柱形の柱状部材２の外方に配
置した水平状の取付板1gに左右一対のローラ2e，2eを取
り付け、両ローラ2e，2eを前記両長孔1f，1f内に位置さ
せるとともに、前記取付板1gには円柱形の柱状部材２を
取り囲むごとく配置されていてその外周面に沿って回転
する複数個のガイドローラ1h，1hを取り付けた場合を例
示する。7 and 8 show another specific example different from the case shown in FIG. That is, in order to make the cover 1 slidable and rotatable with respect to the cylindrical columnar member 2 of the marine structure, as shown in detail in both figures, long holes 1f extending along the longitudinal direction on both sides of the cover 1 in the longitudinal direction, Further, a pair of left and right rollers 2e and 2e are attached to a horizontal mounting plate 1g which forms 1f and which is arranged outside the columnar member 2 having a cylindrical shape inside the cover 1. A case where a plurality of guide rollers 1h, 1h, which are located in the long holes 1f, 1f and are arranged so as to surround the cylindrical columnar member 2 on the mounting plate 1g and rotate along the outer peripheral surface thereof, are mounted. Is illustrated.
【００２０】図７(a) あるいは図７(b) の矢印方向から
潮流や波浪を受けると、円柱形の柱状部材２の外方に配
置されている水平状の取付板1g上の左右一対のローラ2
e，2eが転動し、流れに並行であるカバー１は図７(a)
の右側あるいは図７(b) の左側へスライドし、それぞれ
の図に示す状態となる。一方、図７(a) あるいは図７
(b) の矢印(1) から矢印(2) に示すように流れが変わる
と、前記取付板1g上において円柱形の柱状部材２を取り
囲むごとく配置されている複数個のガイドローラ1h，1h
がこの柱状部材２の外周面に沿って転動するから、取付
板1gとともにカバー１は図７(a) あるいは図７(b) の矢
印で示すように円柱形の柱状部材２を中心に回転し、こ
の場合にも、流れ中の抗力を大幅に低減させることがで
きる。When a tidal current or a wave is received from the direction of the arrow in FIG. 7 (a) or FIG. 7 (b), a pair of left and right on a horizontal mounting plate 1g arranged outside the cylindrical columnar member 2 is provided. Laura 2
The cover 1 in which e and 2e roll and is parallel to the flow is shown in Fig. 7 (a).
Slide to the right side of Fig. 7 or the left side of Fig. 7 (b) to reach the state shown in each figure. On the other hand, FIG. 7 (a) or FIG.
When the flow changes from the arrow (1) to the arrow (2) in (b), a plurality of guide rollers 1h, 1h are arranged on the mounting plate 1g so as to surround the cylindrical columnar member 2.
Rolls along the outer peripheral surface of the columnar member 2, so that the cover 1 rotates together with the mounting plate 1g about the columnar columnar member 2 as shown by the arrow in FIG. 7 (a) or 7 (b). However, also in this case, the drag force in the flow can be significantly reduced.
【００２１】この場合のカバー１も合成樹脂、例えば、
ＦＲＰ製とすることができ、また、ローラ2e、ローラ1h
も合成樹脂製とすることができる。図８(a) および図８
(c) に示すように、カバー１のうち長孔1f付近を肉厚と
して長孔1fを補強しておくとよい。なお、図７(a),(b)
および図８(b) における符号1iは、カバー１の前後にお
いて長手方向両側に跨がるごとく配置したストッパー
で、カバー１がそれ以上スライドしないようにするため
のものである。カバー１の補強の役もする。また、図８
(b) における符号2fは、円柱形の柱状部材２に巻き付け
るようにその外周面に取り付けられたストッパーで、前
記ガイドローラ1h，1hのガイドの役をなすものである。The cover 1 in this case is also made of synthetic resin, for example,
Can be made of FRP, roller 2e, roller 1h
Can also be made of synthetic resin. 8 (a) and 8
As shown in (c), it is advisable to reinforce the long hole 1f by making the vicinity of the long hole 1f of the cover 1 thick. In addition, FIG. 7 (a), (b)
Further, reference numeral 1i in FIG. 8 (b) is a stopper arranged so as to straddle both sides in the longitudinal direction in the front and rear of the cover 1 to prevent the cover 1 from sliding further. It also serves to reinforce the cover 1. Also, FIG.
Reference numeral 2f in (b) is a stopper attached to the outer peripheral surface of the cylindrical columnar member 2 so as to be wound around the columnar member 2, and serves as a guide for the guide rollers 1h and 1h.
【００２２】図２〜図４、図５、図６及び図７〜図８に
それぞれ示すカバー１には、抗力を低減させる以外にも
う一つの機能がある。すなわち、海洋構造物の円柱形の
柱状部材２の後流渦で自励振動が生じることによる流れ
に直角方向の振動を防ぐことである。これにより、例え
ば、図１１に示すスパーブイ型ボーリング櫓などのよう
に、きわめて細長い海洋構造物の姿勢を流れ中で直立安
定させることが可能となる。The cover 1 shown in each of FIGS. 2 to 4, 5, 6, and 7 to 8 has another function in addition to reducing the drag force. That is, it is to prevent vibration in a direction perpendicular to the flow due to self-excited vibration generated in the wake vortex of the cylindrical columnar member 2 of the marine structure. This makes it possible to stabilize the posture of an extremely elongated offshore structure upright in the flow, such as the spar buoy boring turret shown in FIG.
【００２３】円柱形の柱状部材２に対して少なくともス
ライド可能なカバー１（図２〜図４、図５、図６及び図
７〜図８にそれぞれ示す）の前後方向の長さは、カバー
全長の約１／３の位置が円柱形の柱状部材２の中心に一
致するようにするのがよい。すなわち、図９における
Ｌ：Ｌ’が約１：２となるようにカバー１の前後方向の
長さを設定するのがよい。この位置が楕円形、長円形も
しくはそれらに類似する形状のカバー１の揚力中心（流
れに直角方向の力点、横方向の力）であり、この点に円
柱形の柱状部材２の中心がくるようにカバー１の前後方
向の長さを設定しておくと、流れに直角方向の力点すな
わち横方向の力を円柱形の柱状部材２の中心で受けるこ
とになる。したがって、円柱形の柱状部材２を有する海
洋構造物が潮流や波浪を受ける水中で安定した状態にあ
り、また、潮流や波浪を受けるカバー１が壊れにくい。The length in the front-rear direction of the cover 1 (shown in FIGS. 2 to 4, 5, 6, and 7 to 8) which is at least slidable with respect to the columnar member 2 is the total length of the cover. It is preferable that the position of about ⅓ of the above is aligned with the center of the cylindrical columnar member 2. That is, it is preferable to set the length of the cover 1 in the front-rear direction so that L: L 'in FIG. 9 is about 1: 2. This position is the center of lift of the cover 1 having an elliptical shape, an oval shape, or a shape similar thereto (a force point in the direction perpendicular to the flow, a force in the lateral direction), and the center of the cylindrical columnar member 2 is located at this point. When the length of the cover 1 in the front-rear direction is set, the force point in the direction perpendicular to the flow, that is, the lateral force is received at the center of the cylindrical columnar member 2. Therefore, the marine structure having the columnar member 2 having a cylindrical shape is in a stable state in the water that receives the tidal current and the waves, and the cover 1 that receives the tidal current and the waves is not easily broken.
【００２４】カバー１は円柱形の柱状部材２の軸方向に
長く伸びるような大きなものであってもよい。例えば、
本発明を急潮流用スパーブイ型ボーリング櫓に適用した
場合においては、円柱形の柱状部材２が図１１に示す程
度まで覆われるように一つのカバー１の大きさを設定し
てもよいが、図２、図５(b) 、図６、図７及び図８(b)
に示すように、円柱形の柱状部材２の軸方向に対してカ
バー１，１を上下に分割して取り付けることが望まし
い。このようにすると、海洋構造物の設置場所における
地形状況などにより、潮流や波浪などによる流向が水深
方向において異なる場合でも、上下に分割して取り付け
られている各カバー１，１をその水深での流向に自動的
に対応させることができる。すなわち、海洋構造物の設
置場所における地形状況などにより、潮流や波浪などに
よる流向が水深方向、例えば、水面付近とそれより深い
所とにおいて異なる場合があるが、円柱形の柱状部材２
の軸方向に対してカバー１，１を上下に分割して取り付
けておくと、このような場合にも対応できる。The cover 1 may be large so as to extend long in the axial direction of the cylindrical columnar member 2. For example,
When the present invention is applied to a spar buoy type boring turret for a rapid flow, the size of one cover 1 may be set so that the cylindrical columnar member 2 is covered to the extent shown in FIG. 2, FIG. 5 (b), FIG. 6, FIG. 7 and FIG. 8 (b)
As shown in, it is desirable that the covers 1 and 1 are divided into upper and lower parts with respect to the axial direction of the columnar member 2 and attached. By doing this, even if the flow direction due to tidal currents or waves differs in the water depth direction due to the topographical conditions at the installation location of the offshore structure, the covers 1 and 1 that are installed separately at the top and bottom are installed at that water depth. The flow direction can be automatically adjusted. That is, depending on the topographical conditions at the installation location of the offshore structure, the flow direction due to tidal currents or waves may differ in the depth direction, for example, near the water surface and deeper than that, but the cylindrical columnar member 2
Such a case can be dealt with by dividing the covers 1 and 1 into upper and lower parts with respect to the axial direction.
【００２５】図１０には、カバー１の先端部及び後端部
に紐状物ないし帯状物３を取り付けた場合が例示されて
いる。このように、カバー１の先端部及び後端部に紐状
物ないし帯状物３が取り付けられていると、海洋構造物
の設置場所での潮流や波浪などによる流れにより、この
紐状物ないし帯状物３が図１０に示すように翻り、円柱
形の柱状部材２に対するカバー１のスライド動作が容易
かつスムーズになるだけでなく、カバー１を流れに並行
になりやすくすることができる。円柱形の柱状部材２の
軸方向に対してカバー１，１を上下に分割して取り付け
た場合には、図１０(b) に示すように、各カバー１，１
の先端部及び後端部にそれぞれ紐状物ないし帯状物３を
取り付けるものとする。FIG. 10 exemplifies a case in which the cord-shaped material or the band-shaped material 3 is attached to the front end portion and the rear end portion of the cover 1. As described above, when the string-shaped or band-shaped material 3 is attached to the front end and the rear end of the cover 1, the string-shaped material or band-shaped material is caused by the flow of tidal currents and waves at the installation location of the marine structure. The object 3 flutters as shown in FIG. 10, so that not only the sliding operation of the cover 1 with respect to the cylindrical columnar member 2 becomes easy and smooth, but also the cover 1 can easily be made parallel to the flow. When the covers 1 and 1 are divided into upper and lower parts with respect to the axial direction of the cylindrical columnar member 2 and attached, as shown in FIG.
It is assumed that the string-like object or the band-like object 3 is attached to each of the front end portion and the rear end portion of the.
【００２６】本発明は、円柱形の柱状部材２を有する海
洋構造物のほとんどのものに適用することができる。例
えば、急潮流用スパーブイや図１１に示す急潮流用スパ
ーブイ型ボーリング櫓Ｓに適用できるほか、図１２に示
す海上プラットホームＰの縦材p1、水平材p2や斜め方向
に配置されている部材にも適用することができる。そし
て、いずれの場合でも、水中に設置されている円柱状部
材２を有する海洋構造物の流れ中の抗力を大幅に低減さ
せることができる。The present invention can be applied to almost all offshore structures having a cylindrical columnar member 2. For example, it can be applied to a rapid flow spar buoy and a rapid flow spar buoy type boring turret S shown in FIG. 11 as well as vertical members p 1 and horizontal members p 2 of the offshore platform P shown in FIG. 12 and members arranged in an oblique direction. Can also be applied to. In any case, the drag force in the flow of the marine structure having the cylindrical member 2 installed in the water can be significantly reduced.
【００２７】図１２では、海上プラットホームＰの縦材
p1のうちの１本のみに、また、水平材p2のうちの１本の
みに、いずれも本発明の抗力低減装置を取り付けた状態
を示しているが、それら全てに取り付けてもよいし、適
切な部分のみに取り付けてもよい。なお、海上プラット
ホームＰの場合には、プラットホーム上にはクレーンそ
の他の作業機械が搭載されている。また、前記スパーブ
イ型ボーリング櫓では、図２、図３、図５(a) 、図６及
び図８(a) に示すように、センターパイプである円柱形
の柱状部材２が二重パイプになっており、内側のパイプ
内には図１１において符号４で示すボーリング機材が挿
通せしめられている。このスパーブイ型ボーリング櫓
は、通常、係留具５により海底Ｇ上の沈錘６に係留さ
れ、浮力体７（球形が好ましい）は水中に引き込まれて
いる。In FIG. 12, the vertical members of the offshore platform P are shown.
It is shown that the drag reducing device of the present invention is attached to only one of p 1 and only one of the horizontal members p 2 , but it may be attached to all of them. , May be attached only to an appropriate part. In the case of the offshore platform P, a crane and other work machines are mounted on the platform. Further, in the spar buoy type boring turret, as shown in FIGS. 2, 3, 5 (a), 6 and 8 (a), the columnar member 2 having a cylindrical shape as the center pipe is a double pipe. The boring equipment indicated by reference numeral 4 in FIG. 11 is inserted into the inner pipe. This spar buoy type boring turret is usually moored by a mooring tool 5 to a sink 6 on the seabed G, and a buoyant body 7 (preferably spherical) is drawn into the water.
【００２８】[0028]
【発明の効果】請求項１〜３記載の発明によれば、海洋
構造物が水中で受ける流体による抗力を大幅に低減させ
ることができ、また、海洋構造物が水中に設置されてい
る場合にはその姿勢を流れ中で直立安定させることを可
能ならしめ得る効果がある。According to the inventions of claims 1 to 3, it is possible to significantly reduce the drag force exerted by the fluid on the marine structure underwater, and when the marine structure is installed underwater. Has the effect of making it possible to stabilize its posture upright in the flow.
【００２９】請求項４記載の発明によれば、海洋構造物
の設置場所における地形状況などにより、潮流や波浪な
どによる流向が水深方向において異なる場合でも、上下
に分割して取り付けられている各カバーをその水深での
流向に自動的に対応させることができる効果がある。According to the invention described in claim 4, even if the flow direction due to a tidal current or a wave is different in the depth direction due to the topographical conditions at the installation location of the offshore structure, the covers are installed separately in the vertical direction. Has the effect of being able to automatically respond to the flow direction at that depth.
【００３０】請求項５記載の発明によれば、柱状部材に
対するカバーのスライド動作が容易かつスムーズになる
だけでなく、カバーを流れに並行になりやすくすること
ができる効果がある。According to the fifth aspect of the present invention, there is an effect that not only the sliding operation of the cover with respect to the columnar member can be made easy and smooth, but also the cover can be easily made parallel to the flow.
【図１】本発明による柱状部材を有する海洋構造物の抗
力低減装置の原理図で、(a) は楕円形、長円形もしくは
それらに類似する形状のカバーを、海洋構造物の円柱形
の柱状部材に対してスライド可能に設けた場合（本発明
の第一の実施の形態）を、(b) は楕円形、長円形もしく
はそれらに類似する形状のカバーを、海洋構造物の円柱
形の柱状部材に対して回転可能に設けた場合（本発明の
第二の実施の形態）を、(c) は楕円形、長円形もしくは
それらに類似する形状のカバーを、海洋構造物の円柱形
の柱状部材に対してスライドならびに回転可能に設けた
場合（本発明の第三の実施の形態）を示す。FIG. 1 is a principle diagram of a drag reducing device for an offshore structure having a columnar member according to the present invention, in which (a) shows a cover having an elliptical shape, an oval shape, or a similar shape, and a cylindrical columnar shape for the offshore structure. In the case of being provided slidably with respect to the member (the first embodiment of the present invention), (b) is a cover having an elliptical shape, an oval shape or a similar shape, and a cylindrical column shape of the marine structure. In the case where the member is rotatably provided with respect to the member (second embodiment of the present invention), (c) is an elliptical shape, an oval shape or a shape similar thereto, and is a columnar shape of a marine structure. The case where it is provided so as to be slidable and rotatable with respect to the member (the third embodiment of the present invention) is shown.
【図２】海洋構造物の円柱形の柱状部材に対しカバーを
スライド可能ならしめるための具体例を示すもので、
(a) は矢印方向から潮流や波浪を受け、カバーが右側に
スライドした場合の平面図ならびに正面図、(b) は矢印
方向から潮流や波浪を受け、カバーが左側にスライドし
た場合の平面図ならびに正面図である。FIG. 2 shows a specific example for making a cover slidable on a cylindrical columnar member of an offshore structure,
(a) Plan view and front view when the cover slides to the right due to tidal currents and waves from the arrow direction, and (b) Plan view when the cover slides to the left due to tidal currents and waves from the arrow direction. It is also a front view.
【図３】図２(a) の平面図をさらに詳細に示す拡大平面
図で、一部を切断して示す。FIG. 3 is an enlarged plan view showing the plan view of FIG. 2 (a) in more detail, with a part cut away.
【図４】円柱形の柱状部材に取り付けたローラがカバー
の長孔内に位置する状態を示す縦断面図である。FIG. 4 is a vertical cross-sectional view showing a state in which a roller attached to a columnar member having a cylindrical shape is positioned in a long hole of a cover.
【図５】海洋構造物の円柱形の柱状部材に対しカバーを
回転可能ならしめるための具体例を示すもので、(a) は
流れが変わった場合においてその流れにカバーが追従し
得る様子を示す平面図、(b) は流れが変わる前のカバー
の状態を示す正面図、(c) は円柱形の柱状部材とその外
周方に配置されている回転バンドとの関係を詳細に示す
一部切欠の拡大平面図である。[Fig. 5] Fig. 5 shows a specific example for allowing the cover to rotate with respect to the cylindrical columnar member of the offshore structure. (A) shows how the cover can follow the flow when the flow changes. The top view is shown, (b) is a front view showing the state of the cover before the flow changes, and (c) is a part showing in detail the relationship between the cylindrical columnar member and the rotation band arranged on the outer periphery thereof. It is an enlarged plan view of a notch.
【図６】海洋構造物の円柱形の柱状部材に対しカバーを
スライドならびに回転可能ならしめるための具体例を示
すもので、(a) は矢印方向から潮流や波浪を受け、カバ
ーが右側にスライドした場合とその状態から回転し得る
様子を示す平面図ならびに正面図、(b) は矢印方向から
潮流や波浪を受け、カバーが左側にスライドした場合と
その状態から回転し得る様子を示す平面図ならびに正面
図である。FIG. 6 shows a specific example for allowing the cover to slide and rotate with respect to the cylindrical columnar member of the offshore structure. (A) receives the tidal current and waves from the direction of the arrow, and the cover slides to the right. The plan view and front view showing that the cover can be rotated from that state, and (b) is a plan view showing the case where the cover slides to the left due to tidal currents and waves from the direction of the arrow and the state that it can rotate from that state. It is also a front view.
【図７】海洋構造物の円柱形の柱状部材に対しカバーを
スライドならびに回転可能ならしめるための別の具体例
を示すもので、(a) は矢印方向から潮流や波浪を受け、
カバーが右側にスライドした場合とその状態から回転し
得る様子を示す平面図ならびに正面図、(b) は矢印方向
から潮流や波浪を受け、カバーが左側にスライドした場
合とその状態から回転し得る様子を示す平面図ならびに
正面図である。FIG. 7 shows another specific example for allowing the cover to slide and rotate on the cylindrical columnar member of the offshore structure. (A) receives tidal current and waves from the direction of the arrow,
A plan view and a front view showing that the cover slides to the right and can rotate from that state, (b) shows tidal currents and waves from the direction of the arrow, and the cover can rotate from its left slide and its state It is the top view and front view which show a mode.
【図８】図７の詳細図で、(a) は拡大平面図、(b) はＢ
−Ｂ線断面図、(c) はＣ−Ｃ線断面図である。8 is a detailed view of FIG. 7, in which (a) is an enlarged plan view and (b) is B.
-B line sectional drawing, (c) is CC sectional view.
【図９】円柱状部材に対して少なくともスライド可能な
カバーの前後方向の長さを、どのように設定したら良い
かを示す原理図である。FIG. 9 is a principle view showing how to set at least the length in the front-rear direction of the cover slidable with respect to the cylindrical member.
【図１０】円柱形の柱状部材にスライド可能に設けたカ
バーの先端部及び後端部に、紐状物ないし帯状物を取り
付けた状態を示すもので、(a) は平面図、(b) は正面図
である。FIG. 10 shows a state in which a string-shaped object or a belt-shaped object is attached to the front end portion and the rear end portion of a cover slidably provided on a columnar member, (a) is a plan view, and (b) is a plan view. Is a front view.
【図１１】本発明による抗力低減装置を急潮流用スパー
ブイ型ボーリング櫓に適用した場合の使用状態を示す概
略図である。FIG. 11 is a schematic view showing a usage state when the drag reduction device according to the present invention is applied to a rapid flow sparbuoy type boring turret.
【図１２】本発明による抗力低減装置を海上プラットホ
ームに適用した場合の使用状態を示す概略図である。FIG. 12 is a schematic view showing a usage state when the drag reduction device according to the present invention is applied to a marine platform.
１…カバー、1a…長孔、1b…ストッパー、1f…長孔、1h
…ローラ、1i…ストッパー、２…円柱状部材、2a…ロー
ラ、2d…ローラ、2e…ローラ、３…紐状物ないし帯状
物、Ｓ…急潮流用スパーブイ型ボーリング櫓、Ｐ…海上
プラットホーム。1 ... Cover, 1a ... Slot, 1b ... Stopper, 1f ... Slot, 1h
... Rollers, 1i ... Stoppers, 2 ... Cylindrical members, 2a ... Rollers, 2d ... Rollers, 2e ... Rollers, 3 ... Strings or strips, S ... Spurbuoy type boring turrets for rapid currents, P ... Marine platforms.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 大谷 良一 大阪府池田市豊島南２丁目176番地の１ 株式会社ゼニライトブイ内 (72)発明者 高見 健 東京都千代田区九段北４丁目２番６号 応 用地質株式会社内 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Ryoichi Otani 1 of 2-176, South Teshima, Ikeda City, Osaka Prefecture Zeni Light Buoy Co., Ltd. (72) Inventor Ken Takami 4-2-6, 9th dan north, Chiyoda-ku, Tokyo Geological Co., Ltd.
Claims (5)
形状のカバー１を、海洋構造物の柱状部材２に対してス
ライド可能に設けたことを特徴とする柱状部材を有する
海洋構造物の抗力低減装置。1. A drag force of a marine structure having a columnar member, characterized in that a cover 1 having an elliptical shape, an oval shape or a shape similar thereto is provided slidably on a columnar member 2 of the marine structure. Reduction device.
形状のカバー１を、海洋構造物の柱状部材２に対して回
転可能に設けたことを特徴とする柱状部材を有する海洋
構造物の抗力低減装置。2. A drag force of a marine structure having a columnar member, characterized in that a cover 1 having an elliptical shape, an oval shape or a shape similar thereto is provided rotatably with respect to the columnar member 2 of the marine structure. Reduction device.
形状のカバー１を、海洋構造物の柱状部材２に対してス
ライドならびに回転可能に設けたことを特徴とする柱状
部材を有する海洋構造物の抗力低減装置。3. A marine structure having a columnar member, characterized in that a cover 1 having an elliptical shape, an oval shape or a shape similar thereto is provided so as to be slidable and rotatable with respect to the columnar member 2 of the marine structure. Drag reduction device.
を上下に分割して取り付けたことを特徴とする請求項１
〜３のいずれかに記載の柱状部材を有する海洋構造物の
抗力低減装置。4. The covers 1, 1 with respect to the axial direction of the columnar member 2.
2. The upper and lower parts are attached separately.
A drag reduction device for an offshore structure, comprising the columnar member according to any one of items 1 to 3.
いし帯状物３を取り付けたことを特徴とする請求項１〜
４のいずれかに記載の柱状部材を有する海洋構造物の抗
力低減装置。5. A cord-like object or a band-like object 3 is attached to a front end portion and a rear end portion of the cover 1, respectively.
4. A drag reduction device for marine structures having the columnar member according to any one of 4 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001247629A JP5134170B2 (en) | 2001-08-17 | 2001-08-17 | Drag reduction device for offshore structures with columnar members |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001247629A JP5134170B2 (en) | 2001-08-17 | 2001-08-17 | Drag reduction device for offshore structures with columnar members |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003054486A true JP2003054486A (en) | 2003-02-26 |
| JP5134170B2 JP5134170B2 (en) | 2013-01-30 |
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ID=19076926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001247629A Expired - Lifetime JP5134170B2 (en) | 2001-08-17 | 2001-08-17 | Drag reduction device for offshore structures with columnar members |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5134170B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162287A (en) * | 2011-04-08 | 2011-08-24 | 浙江东南网架股份有限公司 | Steel column with eccentric oval table and preparation method thereof |
| JP2013529736A (en) * | 2010-07-05 | 2013-07-22 | マリーン カレント タービンズ リミテッド | Surface-projecting reusable underwater template for installing one or more underwater struts or piles |
| CN107023030A (en) * | 2017-03-30 | 2017-08-08 | 河海大学 | Oval pile foundation and its performance test apparatus and method for marine tidal-current energy engineering |
| KR102217814B1 (en) * | 2019-12-18 | 2021-02-18 | 한국해양과학기술원 | Hybrid private aid to navigation adaptable to sites with strong tidal currents for observation of ocean-environment |
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| JPS5495499A (en) * | 1978-01-10 | 1979-07-27 | Mitsubishi Heavy Ind Ltd | Device for high-speed underwater towing |
| JPS5613278A (en) * | 1979-07-11 | 1981-02-09 | Shin Meiwa Ind Co Ltd | Vortex vibration preventing device for towing cable |
| JPS56105092A (en) * | 1980-01-28 | 1981-08-21 | Mitsui Shipbuilding Eng | Vibrationproof device for underwater pipe |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013529736A (en) * | 2010-07-05 | 2013-07-22 | マリーン カレント タービンズ リミテッド | Surface-projecting reusable underwater template for installing one or more underwater struts or piles |
| CN102162287A (en) * | 2011-04-08 | 2011-08-24 | 浙江东南网架股份有限公司 | Steel column with eccentric oval table and preparation method thereof |
| CN102162287B (en) * | 2011-04-08 | 2012-08-22 | 浙江东南网架股份有限公司 | Steel column with eccentric oval table and preparation method thereof |
| CN107023030A (en) * | 2017-03-30 | 2017-08-08 | 河海大学 | Oval pile foundation and its performance test apparatus and method for marine tidal-current energy engineering |
| KR102217814B1 (en) * | 2019-12-18 | 2021-02-18 | 한국해양과학기술원 | Hybrid private aid to navigation adaptable to sites with strong tidal currents for observation of ocean-environment |
Also Published As
| Publication number | Publication date |
|---|---|
| JP5134170B2 (en) | 2013-01-30 |
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