JPS58183380A - Plant barge - Google Patents

Plant barge

Info

Publication number
JPS58183380A
JPS58183380A JP57065710A JP6571082A JPS58183380A JP S58183380 A JPS58183380 A JP S58183380A JP 57065710 A JP57065710 A JP 57065710A JP 6571082 A JP6571082 A JP 6571082A JP S58183380 A JPS58183380 A JP S58183380A
Authority
JP
Japan
Prior art keywords
wave
main column
mat
submerged
point
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.)
Pending
Application number
JP57065710A
Other languages
Japanese (ja)
Inventor
Seiya Yamashita
山下　誠也
Tsunetaka Sasaki
佐々木　恒登
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
IHI Corp
Original Assignee
IHI Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IHI Corp filed Critical IHI Corp
Priority to JP57065710A priority Critical patent/JPS58183380A/en
Priority to GB08310249A priority patent/GB2118904B/en
Priority to NO831347A priority patent/NO160069C/en
Priority to SE8302157A priority patent/SE8302157L/en
Priority to FR838306609A priority patent/FR2525176B1/en
Publication of JPS58183380A publication Critical patent/JPS58183380A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44—Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00—Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/04—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull
    • B63B2001/044—Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with single hull with a small waterline area compared to total displacement, e.g. of semi-submersible type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B39/00—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude
    • B63B39/06—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water
    • B63B2039/067—Equipment to decrease pitch, roll, or like unwanted vessel movements; Apparatus for indicating vessel attitude to decrease vessel movements by using foils acting on ambient water effecting motion dampening by means of fixed or movable resistance bodies, e.g. by bilge keels

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

PURPOSE:To enable upper and lower hollow structures to store LNG or the like, by supporting on a mat containing a ballast tank an upper hull by side columns, and costricting a main column at a point that is submerged. CONSTITUTION:The upper hull 1 is supported on the mat 4 containing a ballast tank by side columns 3. The main column 2 is positioned between the upper hull 1 and the mat 4. The main column 2 is constricted adjacent to a point that is submerged, and LNG or the like is contained in the upper and lower hollow column constructions thereof. Since the point which will be submerged has the thus constricted section that has an effect for suppressing a wave compelling force, the wave compelling force acting on the plant table ship can be lowered, so that the mooring apparatus can be made lightweight.

Description

【発明の詳細な説明】 本発明は海洋構造物、特に天然ガスの出荷基地として供
される半潜水式プラント台船に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to offshore structures, particularly semi-submersible plant barges used as natural gas shipping terminals.

近年天然ガスは石油と比肩するエネルギ源として尊属さ
れるに到っているが、我国に於ける天然ガスの産出敏は
僅かであり、殆どが輸入にたよっている。In recent years, natural gas has come to be regarded as an energy source comparable to oil, but the amount of natural gas produced in Japan is small, and most of it is imported.

天然ガスは産地に於いて液化され一時貯蔵さ搬される。Natural gas is liquefied at the production site, temporarily stored, and then transported.

従来産地では地］−に液化及び貯蔵基地を建設して、ガ
ス［１（から基地まではパイプラインにより接続してい
る。天然ガスは該基地で液化貯蔵された後適宜ＬＮＧ船
へ積荷され、出荷される。A liquefaction and storage base is built in the conventional production area, and the gas [1] is connected to the base by a pipeline. After the natural gas is liquefied and stored at the base, it is loaded onto an LNG ship as appropriate. Will be shipped.

」―記した従来の方法ではパイプラインを設置すること
が高価で設備費が高くつく、液化貯蔵基地としての広大
な敷地が必要である、船積みのための基地および貯蔵基
地からの、パイピングが必要である、等の不具合がある
。” - In the conventional method described, it is expensive to install pipelines and equipment costs are high, a vast area is required as a liquefaction storage base, and piping from a shipping base and a storage base is required. There are problems such as.

そこで洋上に、液化設備貯蔵機能を設けた出荷基地を建
設することも考えられるが、斯かる海洋構造物には波に
よる上下方向の強制力（以下波強制力という）が作用す
る。この為、悪天候により波強制力が強くなると海洋構
造物の揺れが大きくなり基地としての機能が停止するこ
ととなり、基地の稼動［Ｊ数は天候に大幅に左右される
。又、海洋構造物の係留装置も最悪の条件下ｔの波強制
力に耐え得るに十分なものでな置の安全性も問題となる
等の理由よりこの種洋上プラントで実現されているもの
はない。Therefore, it is conceivable to construct a shipping base equipped with a liquefaction equipment storage function on the ocean, but such offshore structures are subject to vertical forcing by waves (hereinafter referred to as wave forcing). For this reason, if the wave forcing becomes strong due to bad weather, the offshore structure will sway so much that it will cease to function as a base, and the base's operation [J number] is greatly affected by the weather. In addition, the mooring equipment for offshore structures is not sufficient to withstand the wave force of t under the worst conditions, and the safety of the installation is also an issue. do not have.

本発明は上記実情に鑑みなされたものであり、波強制力
を軽減することにより実用に足る液化設備貯蔵機能を備
えた出荷基地としてのプラント台船を提供することを目
的とするものである。The present invention was made in view of the above circumstances, and an object of the present invention is to provide a plant barge as a shipping base that is equipped with a practical liquefaction equipment storage function by reducing wave forcing.

以下図面を参照しつつ本発明の詳細な説明する。The present invention will be described in detail below with reference to the drawings.

第１図は本発明に係る半潜水式プラント台船の概略斜視
図であり、液化設備等の諸設備が載設されるところのア
ッパハル（１＋はメインコラム（２）、サイドコラム（
３）によりバラストタンクを内蔵したマント（４）に支
承され、図示しない係留装置によって位置の確保が行わ
れている。FIG. 1 is a schematic perspective view of a semi-submersible plant barge according to the present invention, in which the upper hull (1+ indicates the main column (2), the side column (2), and
3), it is supported by a mantle (4) containing a built-in ballast tank, and its position is secured by a mooring device (not shown).

メインコラム（２）はくびれ部（５）を有し、中は空洞
となっていて液化したガスを貯蔵し得る様になっている
。又、マット（４）のバラストタンク内の注水量を適宜
調整することにより、ガスの貯蔵機に拘ず喫水位置が一
定となる様にすると共に荒天時にはアッパハルを上昇さ
せ波がアッパハル（１）を打つことによる振動、破壊を
防＋にする。The main column (2) has a constriction (5) and is hollow inside to store liquefied gas. In addition, by appropriately adjusting the amount of water injected into the ballast tank of the mat (4), the draft position is kept constant regardless of the gas storage device, and the upper hull is raised during stormy weather to prevent waves from hitting the upper hull (1). Prevents vibration and destruction caused by hitting.

ここで前記したメインコラム（２）のくびれ部（５）は
波強制力の抑止作用があり、該くびれ部（５）を設ける
ことにより波強制力が大幅に軽減され、前記した種々の
機能を有する出荷基地としてのプラント台船の実現をｒ
ｉｆ能とする。The constricted portion (5) of the main column (2) mentioned above has the effect of suppressing wave forcing, and by providing the constricted portion (5), the wave forcing force is significantly reduced, and the various functions described above can be achieved. The realization of a plant barge as a shipping base with
If it is possible.

第２図はメインコラム（２）を計算及び実験の為にモデ
ル化したものであり、逆円錐台（６）と円錐台（７）と
を柱体（８）で連結してくびれ部（５）を形成せしめで
ある。Figure 2 is a model of the main column (2) for calculations and experiments, in which the inverted truncated cone (6) and the truncated cone (7) are connected by a column (8), and the constriction part (5 ).

而して、第５図はメインコラム、（２）に作用する波強
制力を特異点分布法（ＦＪ本造船学会論文集、第１４８
号、１９８０年参照）により計算した結果及び実験結果
を示すものである。Figure 5 shows the wave forcing force acting on the main column (2) using the singularity distribution method (FJ Journal of Naval Architects, No. 148).
1980) and experimental results.

ここで実験に供したモデルの諸元等及び座標＠ｊｅ、　
　νは以下の通りである。Here, the specifications and coordinates of the model used in the experiment @je,
ν is as follows.

表中、Ｄ、　Ｄ、、　Ｄ２：モデル各部の直径、Ｔ；喫
水、単位はいずれも（ｍ）である。In the table, D, D, D2: Diameter of each part of the model, T: Draft, all units are (m).

又、 ω：入射波の周波数 ２ζＡ：入射波の波高 ｑ：重力の加速度 Ｆ：波強制力 ρ：原流体密度 π　円周率 実験は入射波２ζＡ二０．０４ｍ、　０．０８ｍの２条
件で行いそれぞれの実験結果をプロット・（２ζＡ二０
．０４７ＦＬ）、プロット・（２ζＡ＝０．０８ｍ）で
示しており、計算値は連続した曲線で示している。Also, ω: Frequency of incident wave 2ζA: Wave height of incident wave q: Acceleration of gravity F: Wave forcing force ρ: Original fluid density π The pi experiment was conducted under two conditions: incident wave 2ζA2 0.04 m and 0.08 m. and plot each experimental result (2ζA20
．． 047FL), plot (2ζA=0.08m), and the calculated values are shown as a continuous curve.

第３図か、られかるように、第２図に示した形状では、
二つの周波数で波強制力を受けない。As shown in Figure 3, in the shape shown in Figure 2,
There is no wave forcing at the two frequencies.

この理由を考えるにあたって、波強制力を二つの成分に
分け、上向きに働く力と下向きに働く力の和とする。両
方の力が釣り合うときの周波数が波強制力が零となる周
波数である。まず、Ｆ向きに割く力について考えると、
これは主として円錐台（力の傾斜面（下部ふくらみの上
面）に作用する波の圧力によって決まるものであり、く
びれ部（５）があることの影響は、全周波数にわたって
あまり人きく現われない。一方、上向きに動く力は、」
三に逆円錐台（６）の斜面（上部ふくらみ部下面）と円
錐台（７）の下面に作用する圧力に基づくものであり、
低周波数（波長か長い）領域では、くびれ部ｆ！’ｉｌ
の影響は小さいが、周波数が高くなる（波長か短くなる
）と、逆円錐台（６）の斜面に働く力が相対的に°大き
くなり、くびれ部（５）は上向きに働く力をかなり増大
させる効果を表す。これは、波長が短い場合、波の圧力
は水面付近で大きく、水深か増すに従って急激に減少す
る、ごとによる。In considering the reason for this, we divide the wave forcing into two components and consider the sum of the force acting upward and the force acting downward. The frequency at which both forces are balanced is the frequency at which the wave forcing becomes zero. First, considering the force applied in the direction of F,
This is mainly determined by the wave pressure acting on the truncated cone (force slope (top surface of the lower bulge)), and the effect of the presence of the constriction (5) is not very noticeable over all frequencies.On the other hand, , the force that moves upward is
Thirdly, it is based on the pressure acting on the slope (lower surface of the upper bulge) of the inverted truncated cone (6) and the lower surface of the truncated cone (7),
In the low frequency (long wavelength) region, the waist f! 'il
The effect of is small, but as the frequency becomes higher (wavelength becomes shorter), the force acting on the slope of the inverted truncated cone (6) becomes relatively large, and the constriction (5) considerably increases the force acting upward. represents the effect of This is because when the wavelength is short, wave pressure is large near the water surface and decreases rapidly as the water depth increases.

以−Ｆのことから、いま、周波数に対する上向きおよび
下向きに動く力の曲線について考えると、まず、くびれ
部（５）のイｊ無に関係なく下部ふくらみ部があるとい
う理由だけによって、両方の曲線はある周波数で一度交
叉し、くびれ部（５）があると、それより高い周波数の
ところで、上述のくびれ部（５）の効果が現れて再び交
叉する、という傾向が得られる。ここで、この原理を第
１図のプラント台船に当てはめると、メインコラム（２
）の上半部は第２図の（６）と同じ機能を持ち、メイン
コラムの下半部とマット（４）を合わせたものは第２図
の（７）と同じ働きをする。From the above, if we now consider the upward and downward force curves with respect to frequency, first of all, regardless of the size of the constriction (5), both curves cross once at a certain frequency, and if there is a constriction (5), there is a tendency that the effect of the constriction (5) appears at a higher frequency and the constriction (5) crosses again. Now, if we apply this principle to the plant barge in Figure 1, the main column (2
) has the same function as (6) in Figure 2, and the lower half of the main column combined with mat (4) has the same function as (7) in Figure 2.

くびれ部を有する形状については、第４図（イ）（ロ）
（ハ）（ニ）に示す如く種々考えられる口とは言うまで
もなく、本発明を石油等の貯蔵基地として実施し得るこ
とも勿論である。For shapes with constrictions, see Figure 4 (a) and (b).
It goes without saying that the present invention can be implemented as a storage base for petroleum, etc., as well as various possibilities as shown in (c) and (d).

以上述べた如く本発明によれば、コラム没木部に波強制
力抑制効果のあるくびれ部を設けであるので、プラント
台船に作用する波強制力が大幅に軽減する。従って、稼
動日数が飛躍的に増□大すると共に係留装置の軽容量化
が可能とな、′　り安全性も向上する。As described above, according to the present invention, since the column dead tree part is provided with a constricted portion that has the effect of suppressing wave forcing, the wave forcing acting on the plant barge is significantly reduced. Therefore, the number of operating days can be dramatically increased, the capacity of the mooring device can be reduced, and safety can also be improved.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明に係るプラント台船の概略斜第６図はコ
ラムに作用する波強制力を示す図、第４図（イ）（ロ）
（ハ）（ニ）は種々のくびれ形状を示す説明図である。 ｉｌｌはアッパハル、（２＋はメインコラム、（４Ｎ１
マツト、（５）はくびれ部を示す。 特許出願人 石川島播磨重工業株式会社 特許出願人代理人Figure 1 is a schematic diagram of the plant barge according to the present invention. Figure 6 is a diagram showing the wave forcing force acting on the column, and Figures 4 (a) and (b).
(C) and (D) are explanatory diagrams showing various constriction shapes. ill is upper hull, (2+ is main column, (4N1
(5) indicates the constriction. Patent applicant Ishikawajima Harima Heavy Industries Co., Ltd. Patent applicant agent

Claims (1)

【特許請求の範囲】[Claims] １）パラストタンクを内蔵するマットに所要数のコラム
を介してアッパハルを支承せしめ、１″１す記コラムの
少なくとも一つにくびれ部を没水位置に設けると共にコ
ラムを中空構造にして内部に液化ガス等を貯蔵し得る様
構成したことを特徴とするプラント台船。1) Support the upper hull through the required number of columns on the mat containing the palast tank, provide a constriction in at least one of the 1" 1 columns at a submerged position, and make the column a hollow structure to liquefy the liquid inside. A plant barge characterized by being configured to be able to store gas, etc.
JP57065710A 1982-04-20 1982-04-20 Plant barge Pending JPS58183380A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP57065710A JPS58183380A (en) 1982-04-20 1982-04-20 Plant barge
GB08310249A GB2118904B (en) 1982-04-20 1983-04-15 Offshore structure
NO831347A NO160069C (en) 1982-04-20 1983-04-15 Marine structures.
SE8302157A SE8302157L (en) 1982-04-20 1983-04-18 OFFSHORE CONSTRUCTION
FR838306609A FR2525176B1 (en) 1982-04-20 1983-04-20 HALF-SUBMERGED SEA DRILLING STRUCTURE

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57065710A JPS58183380A (en) 1982-04-20 1982-04-20 Plant barge

Publications (1)

Publication Number Publication Date
JPS58183380A true JPS58183380A (en) 1983-10-26

Family

ID=13294840

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57065710A Pending JPS58183380A (en) 1982-04-20 1982-04-20 Plant barge

Country Status (1)

Country Link
JP (1) JPS58183380A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101099728B1 (en) 2009-04-15 2011-12-29 삼성중공업 주식회사 A floating offshore structure and a draft controlling method of the same
KR101129633B1 (en) * 2009-04-29 2012-03-28 삼성중공업 주식회사 Floating offshore structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101099728B1 (en) 2009-04-15 2011-12-29 삼성중공업 주식회사 A floating offshore structure and a draft controlling method of the same
KR101129633B1 (en) * 2009-04-29 2012-03-28 삼성중공업 주식회사 Floating offshore structure

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