JPS5948246B2 - How to support a landing lift type offshore work platform - Google Patents
How to support a landing lift type offshore work platformInfo
- Publication number
- JPS5948246B2 JPS5948246B2 JP12023081A JP12023081A JPS5948246B2 JP S5948246 B2 JPS5948246 B2 JP S5948246B2 JP 12023081 A JP12023081 A JP 12023081A JP 12023081 A JP12023081 A JP 12023081A JP S5948246 B2 JPS5948246 B2 JP S5948246B2
- Authority
- JP
- Japan
- Prior art keywords
- footing
- work platform
- offshore work
- protrusion
- base
- 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
Links
- 238000000034 method Methods 0.000 claims description 9
- 239000008187 granular material Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 description 21
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000036316 preload Effects 0.000 description 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 1
- 235000017557 sodium bicarbonate Nutrition 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
Description
【発明の詳細な説明】
本発明は、着地昇降式海上作業台の支持方法、より詳し
くは、昇降装置を有する作業台本体と、この作業台本体
に遊嵌し、かつ下面に突起を有するフーチングを下端に
固着した少なくとも３本の支持脚よりなる着地昇降式海
上作業台を基盤上で支持する方法の改良に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for supporting a landing lift type offshore work platform, and more specifically, a work platform body having a lifting device, and a footing that loosely fits into the work platform body and has a protrusion on the lower surface. The present invention relates to an improvement in a method for supporting a landing lift-type offshore work platform on a base, which comprises at least three support legs fixed to the lower end of the platform.
大陸棚等で石油掘削を行なう場合、一般に着地昇降式海
上作業台が使用される。When drilling for oil on the continental shelf, etc., a lift-type offshore work platform is generally used.
この着地昇降式海上作業台Ａは、第１図及び第２図に示
すように昇降装置１を有する作業台本体２と、下端部に
フーティング３を有する少なくとも３本の支持脚４より
構成されている。As shown in FIGS. 1 and 2, this landing lift type offshore work platform A is composed of a work platform main body 2 having a lifting device 1, and at least three support legs 4 having a footing 3 at the lower end. ing.
このフーティング３は支持脚４を着地させて、海上作業
台Ａの全重曹を受け、かつ定点保持を計るため、下面に
傾斜が設けられると共に、そのほぼ沖心には突起５が設
けられている。This footing 3 has an inclined lower surface and a protrusion 5 approximately at the offshore center in order to allow the support leg 4 to land and receive all the baking soda on the offshore work platform A and to maintain a fixed point. There is.
ところでかかる海上作業台Ａは、全重量が７．０００〜
９，０００）ンにも及ぶ大重量構造物であり、また支持
脚４は高さが８０ｍ以上にも達するものである。By the way, the total weight of the offshore work platform A is 7,000~
It is a heavy structure weighing up to 9,000 meters, and the supporting legs 4 reach a height of over 80 meters.
したがって、一般的にはかかる海上作業台Ａを製作する
場合、昇降装置１を有する作業台本体２を盤木等により
梁底で支持し、該作業台本体２に揚重設備によって制限
される長さを有する単位支持脚を遊嵌させ、該単位支持
脚に第二の単位支持脚を連結固着させる工程が採られる
。Therefore, generally when manufacturing such an offshore workbench A, the workbench main body 2 having the lifting device 1 is supported at the bottom of the beam by a board or the like, and the workbench main body 2 has a length limited by the lifting equipment. The second unit support leg is loosely fitted into the second unit support leg, and the second unit support leg is connected and fixed to the unit support leg.
そして組立完成後は、プレロードを作用させる等種々の
試験が行なわれて完成するのであるが、この組立作業や
試験作業の過程において、海上作業台Ａの重・量の全部
または一部をフーティング３を介してして基盤となる梁
底で受ける必要がある。After the assembly is completed, various tests such as applying a preload are carried out, and in the process of assembly and testing, all or part of the weight of offshore work platform A is It is necessary to receive it at the bottom of the beam, which becomes the foundation, through 3.
ところでこの場合、平面である基盤と突起及び傾斜面を
有するフーチング３との関係から応力集中は避けがたい
ものとなり、その盤木の配置や形状を考慮しなければな
らない。By the way, in this case, stress concentration is inevitable due to the relationship between the flat base and the footing 3 having protrusions and sloped surfaces, and the arrangement and shape of the planks must be considered.
かかることから本発明者は、フーティング３と基盤との
間に、第３図に示すような砂等よりなる粉粒体層６を配
置することを先に提案した。For this reason, the present inventor previously proposed that a powder layer 6 made of sand or the like as shown in FIG. 3 be disposed between the footing 3 and the base.
ところで、実際にがかる粉粒体層６を形成させる場合は
、必要最少限の厚さとすることによって粉粒体の少量化
を計りもって、該粉粒体層６の形成または撤去作業の省
力化を計ることが重要となってくる。By the way, when actually forming such a powder layer 6, it is possible to reduce the amount of powder and granules by reducing the thickness to the minimum necessary, thereby saving labor in forming or removing the powder layer 6. Measuring becomes important.
詳述すれば、第３図において梁底の如き基盤７上に厚き
Ｔを有する粉粒体層６を形成させ、支持脚４の下端に設
けられたフーティング３を粉粒体層６の上面に位置させ
るものである。Specifically, in FIG. 3, a powder layer 6 having a thick T is formed on a base 7 such as a beam bottom, and the footing 3 provided at the lower end of the support leg 4 is attached to the powder layer 6. It is placed on the top surface.
８は粉粒体層６を効果的に形成させるための枠体である
。8 is a frame for effectively forming the powder layer 6.
かかる構成において海上作業台Ａの重量は、支持脚４の
下端に設けられたフーティング３に伝達されるが、フー
ティング３の下面に作用する力は粉粒体層６によりフー
ティング３の梁底への投影面積９より広い荷重支持面積
１０に分散される。In this configuration, the weight of the offshore work platform A is transmitted to the footing 3 provided at the lower end of the support leg 4, but the force acting on the lower surface of the footing 3 is transferred by the powder layer 6 to the beam of the footing 3. It is distributed over a load bearing area 10 that is larger than the projected area 9 on the bottom.
この荷重支持面積］０は粉粒体層６の厚みＴに関連する
が、前記投影面積９より著しく広いものとなる。This load bearing area] 0 is related to the thickness T of the powder layer 6, but is significantly wider than the projected area 9.
粉粒体層６はフーティング３の下面が斜面であり、その
中央に突起５が設けられていてもその形状に自然に倣っ
てフーティング３に集中応力が作用しないようになる。The powder layer 6 has a slope on the lower surface of the footing 3, and even if the projection 5 is provided at the center thereof, it naturally follows the shape of the projection 5, so that concentrated stress does not act on the footing 3.
またフーチング３に作用する海上作業台Ａの重量は、基
盤７上の荷重支持面積１０に広く分散されることとなる
ため、フーティング３や基盤７が破壊される恐れもなく
なる。Further, since the weight of the offshore work platform A acting on the footing 3 is widely distributed over the load-bearing area 10 on the base 7, there is no fear that the footing 3 or the base 7 will be destroyed.
ところで前述したように、粉粒体層６の厚さＴは大とな
るほど荷重支持面積１０が広くなり効果的であるが実際
には、この厚さＴを大きくとるためには多量の粉粒体を
必要とするばかりでなく、かつその形成撤去に多大の時
間と労力を必要とすることとなる。By the way, as mentioned above, the larger the thickness T of the powder layer 6 is, the larger the load bearing area 10 becomes, which is more effective.However, in reality, in order to increase the thickness T, a large amount of powder material is required. Not only does it require a lot of time and effort to form and remove it.
したがって粉粒体層６の厚さＴを小さく取ることも考え
られるが、この場合、特に突起５の下面に集中応力が発
生することとなる。Therefore, it is conceivable to reduce the thickness T of the powder layer 6, but in this case, concentrated stress will occur particularly on the lower surface of the protrusion 5.
本発明は、かかる点に鑑みなされたものであって、昇降
装置を有する作業台本体と、該作業台本体に遊嵌し、か
つ下面に突起を有するフーティングを下端に固定した少
なくとも３本の支持脚とよりなる着地昇降式海上作業台
を船渠内の基盤上で支持する方法であって、前記フーチ
ングの下面の突起に対応する船渠の基盤に夫々凹部を設
けると共に、該凹部の周囲に土盛りされ粉粒体層によっ
て前記フーチングの周辺部を支持し、前記フーチング下
面の突起を空中に浮かすようにしたことを特徴とする。The present invention has been made in view of the above, and includes a workbench main body having an elevating device, and at least three footings that loosely fit into the workbench main body and have a footing having a protrusion on the lower surface fixed to the lower end. A method of supporting a lifting type offshore work platform consisting of support legs on a base in a dock, in which a recess is provided in the base of the dock corresponding to the protrusion on the lower surface of the footing, and a mound of earth is provided around the recess. The periphery of the footing is supported by a powder layer, and the protrusion on the lower surface of the footing is suspended in the air.
以下、第４図により本発明の一実施例を説明する。An embodiment of the present invention will be described below with reference to FIG.
第３図と同じ符号は同一名称を示す基盤７上であって、
かつ、フーチング３下面の突起５が当接する個所には凹
部１１が形成されている。The same reference numerals as in FIG. 3 indicate the same names on the base 7,
In addition, a recess 11 is formed at a location on the lower surface of the footing 3 where the projection 5 comes into contact.
凹部１１は好ましくは突起５と類似形状とされる。The recess 11 preferably has a similar shape to the protrusion 5.
即ち、突起５の軸芯Ｃが凹部１１の中心Ｏの直上に来た
とき、左右の間隔ｌと１′及び上下の間隔ｄが殆んど同
じになるように形成されてい−る。That is, when the axis C of the protrusion 5 comes directly above the center O of the recess 11, the left and right distances 1 and 1' and the vertical distance d are formed so that they are almost the same.
そして、該凹部１１を含むフーチング３の下面と基盤７
の間には砂等の粉粒体層６が形成されている。Then, the lower surface of the footing 3 including the recess 11 and the base 7
A powder layer 6 of sand or the like is formed between them.
８は、枠体であってフーチング３に荷重が生じた場合、
分力によって粉粒体層６が矢印Ｆ方向へ移動するのを防
止している。8 is a frame body, and when a load occurs on the footing 3,
The powder layer 6 is prevented from moving in the direction of arrow F due to the component force.
粉粒体層６は、フーチング３から十分離れていれば土の
うで置換えても差支えない。The powder layer 6 may be replaced with sandbags as long as it is sufficiently far from the footing 3.
第５図は本発明の他の実施例であって、基盤上に設けら
れた凹部１１を囲むように土のう１２を設け、該土のう
１２で囲まれる区画Ｂ内にフーチング３の突起５を位置
させると共に、その外周に粉粒体層６′を形成させてい
る。FIG. 5 shows another embodiment of the present invention, in which a sandbag 12 is provided so as to surround a recess 11 provided on the base, and the protrusion 5 of the footing 3 is located within a section B surrounded by the sandbag 12. At the same time, a powder layer 6' is formed around the outer periphery.
上記のように、本発明は昇降装置を有する作業台本体と
該作業台本体に遊嵌し、かつ下面に突起を有するフーチ
ングを下端に固定した少なくとも３本の支持脚とよりな
る着地昇降式海上作業台を船渠内の基盤上で支持する方
法であって、前記フーチングの下面の突起に対応する船
渠の基盤に夫々四部を設けると共に、該凹部の周囲に土
盛りした粉粒体層によって前記フーチングの周辺部を支
持し、前記フーチング下面の突起を空中に浮かすように
したから、最も応力集中が生じる突起部の応力を分散も
しくは、これをなくすることが出来るので、フーチング
３の突起５部分周辺の基盤７が破壊する恐れもない。As described above, the present invention provides a landing lifting type seaplane system comprising a workbench main body having a lifting device and at least three support legs which are loosely fitted into the workbench main body and have a footing having a protrusion on the lower surface fixed to the lower end. A method of supporting a workbench on a base in a dock, in which four parts are provided on the base of the dock corresponding to the protrusions on the lower surface of the footing, and the footing is supported by a layer of powder and granules mounded around the recess. Since the peripheral part is supported and the protrusion on the lower surface of the footing is made to float in the air, the stress at the protrusion where stress is most concentrated can be dispersed or eliminated. There is no fear that Foundation 7 will be destroyed.
したがって、粉粒体層６を薄くすることが可能となり、
以って、粉粒体を少量化出来ると共に、粉粒体層６の形
成、撤去を省力化することができる。Therefore, it is possible to make the powder layer 6 thinner,
Therefore, the amount of granular material can be reduced, and the formation and removal of the granular material layer 6 can be labor-saving.
勿論本発明は、前記実施例１こ限定されるものではなく
、その思想を逸脱しない範囲で種々変更できることは明
らかで゛ある。Of course, the present invention is not limited to the first embodiment, and it is obvious that various changes can be made without departing from the spirit thereof.
第１図は着地昇降式海上作業台の側面図、第２図は第１
図Ｃ部拡大図、第３図は粉粒体層を用いた海上作業台の
支持方法の拡大説明図、第４図及び第５図は夫々本発明
による海上作業台の支持方法の一例を示す拡大説明図。
１・・・・・・昇降装置、２・・・・・・作業台本体、
３・・・・・・フーチング、４・・・・・・支持脚、５
・・・・・・突起、７・・・・・・基盤、８・・・・・
・枠体、１１・・・・・・凹部、１２・・・・・・土の
う。Figure 1 is a side view of the landing lift type offshore work platform, Figure 2 is the side view of the
FIG. 3 is an enlarged view of part C, FIG. 3 is an enlarged explanatory view of a method for supporting an offshore work platform using a powder layer, and FIGS. 4 and 5 each show an example of a method for supporting an offshore work platform according to the present invention. Enlarged explanatory diagram. 1... Lifting device, 2... Workbench main body,
3...Footing, 4...Support leg, 5
...Protrusion, 7...Base, 8...
- Frame body, 11... recess, 12... sandbag.
Claims (1)
嵌し、かつ下面に突起を有するフーチングを下端に固定
した少なくとも３本の支持脚とよりなる着地昇降式海上
作業台を船渠内の基盤上で支持する方法であって、前記
フーチングの下面の突起に対応する船渠の基盤に夫々凹
部を設けると共に、該凹部の周囲に土盛りした粉粒体層
によって前記フーチングの周辺部を支持し、前記フーチ
ング下面の突起を空中に浮かすようにした着地昇降式海
上作業台の支持方法。1. A landing lift type offshore work platform consisting of a work platform body having a lifting device and at least three support legs loosely fitted into the work platform body and having a footing with a protrusion on the lower surface fixed to the lower end is installed in a dock. A method of supporting the footing on a base, wherein recesses are provided in the base of the dock corresponding to the protrusions on the lower surface of the footing, and the periphery of the footing is supported by a layer of granular material mounded around the recess, A method for supporting a landing lift type offshore work platform in which the protrusion on the lower surface of the footing is suspended in the air.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12023081A JPS5948246B2 (en) | 1981-07-31 | 1981-07-31 | How to support a landing lift type offshore work platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12023081A JPS5948246B2 (en) | 1981-07-31 | 1981-07-31 | How to support a landing lift type offshore work platform |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5820818A JPS5820818A (en) | 1983-02-07 |
| JPS5948246B2 true JPS5948246B2 (en) | 1984-11-26 |
Family
ID=14781072
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12023081A Expired JPS5948246B2 (en) | 1981-07-31 | 1981-07-31 | How to support a landing lift type offshore work platform |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5948246B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61139640U (en) * | 1985-02-19 | 1986-08-29 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6441440A (en) * | 1987-08-06 | 1989-02-13 | Daicel Chem | Gas generator |
-
1981
- 1981-07-31 JP JP12023081A patent/JPS5948246B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61139640U (en) * | 1985-02-19 | 1986-08-29 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5820818A (en) | 1983-02-07 |
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