JPS6185290A - Construction of ocean floating structure - Google Patents

Abstract

PURPOSE:To enable construction of large scale structure by sequentially mounting and jointing structure through crosspieces onto the bottom of dock then injecting water sequentially into the dock and preventing from exceeding over allowable load. CONSTITUTION:Crosspieces 2 are arranged on the bottom la of dock 1 then the structure 3 is stacked sequentially from the lower section. At the same time, water is injected into the dock 1 to produce buoyancy in the structure 3 thus to prevent the weight of the structure 3 from exceeding over the allow able load of the bottom of dock. Consequently, large scale ocean floating struc ture can be constructed through utilization of existing facility.

Description

【発明の詳細な説明】 ［産業上の利用分野］ 本発明はドック内で建造される海洋浮上構造物の建造方
法に係り、特にドック底の許容載荷重量を超える重量を
有する構造物を建造するに際して、盤木の利点を活用し
つつ、安全日っ経済的な建造作業を施工し１りる海洋浮
上構造物の建造ブｊ法に関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for constructing a marine floating structure built in a dock, and particularly for constructing a structure whose weight exceeds the allowable loading capacity of the dock bottom. The present invention relates to a method for constructing floating structures on the ocean that utilizes the advantages of planks while carrying out safe and economical construction work.

［従来の技術］ 近年海上等に配備される石油掘削リグ等の尚洋構造物や
ケーソン等の大型構造物が数多く建造されており、これ
らｍ　３ｉ！ｉ物をドック内で建造する方法が考えられ
ている。[Prior Art] In recent years, many large structures such as ocean structures such as oil drilling rigs and caissons deployed on the sea have been constructed, and these m3i! A method of building i-products inside a dock is being considered.

ここに第４図に示すように、旧来からドックａ内での船
体建造に採用されてきた盤木す上で建造する方法がある
。この盤木すを利用する方法は最も広く一般的に採用さ
れている方法で、予めドック底Ｃ上に複数の盤木すを配
設しておき、この盤木す上に構造物ｄを建造するもので
ある。この方法によるとドック底Ｃに凹凸等の起伏があ
っても盤木すの高さ調整で吸収でき、また盤木すにより
ドック底Ｃと構造物ｄとの間に空隙部を得ることができ
るので、この空隙部に機材を搬入して構造物ｄの底部外
面等に対し容易かつ適切に溶接作業や塗装作業を施すこ
とができるという種々の利点がある。As shown in Fig. 4, there is a method of building ships on board boards, which has traditionally been used for ship hull construction in dock a. This method of using board boards is the most widely and commonly adopted method, in which multiple board boards are arranged in advance on the dock bottom C, and the structure d is built on these board boards. It is something to do. According to this method, even if there are irregularities such as irregularities on the dock bottom C, it can be absorbed by adjusting the height of the board, and a gap can be created between the dock bottom C and the structure d by the board. Therefore, there are various advantages in that equipment can be carried into this gap and welding work or painting work can be easily and appropriately performed on the bottom outer surface of the structure d.

他方、本出願人は第５図に示すように盤木を使用せずに
ドックａ内に注水して浮上させた建造用浮体Ｃ上に順次
構造物ｄを建造する方法（特開昭５８−１７０６８４号
公報）を提案した。この提案は浮体ｅの浮力のみによっ
て構造物ｄの重量を支えるものであって、ドックＣには
直接重量は作用せずに水圧として作用するため許容載荷
荷重量を超えるものであっても建造することができる。On the other hand, the present applicant has proposed a method (Japanese Unexamined Patent Application Publication No. 1983-1981) of sequentially constructing structures d on a construction floating body C floated by pouring water into a dock a without using boards as shown in FIG. 170684). In this proposal, the weight of structure d is supported only by the buoyancy of floating body e, and the weight does not act directly on dock C, but acts as water pressure, so even if it exceeds the allowable load capacity, it can be constructed. be able to.

［発明が解決しようとする問題点］ ところで、近年の海洋浮上構造物は大型化のみならずコ
ンクリート製等穫めて大重量で溝成されるものも出現し
ている。[Problems to be Solved by the Invention] In recent years, marine floating structures have not only become larger in size, but also have structures made of concrete or the like that are heavy and have grooves.

このような大重量の海洋構造物ｄを建造するに際し、ド
ック底Ｃに配設した盤木すを利用する場合、構造物ｄの
重量は盤木すを介して集中荷重としてドック底Ｃに局部
的に作用するので、盤木すの設置箇所で局所的にドック
底Ｃの許容載荷重量を超えてしまうことも考えられる。When constructing such a heavy offshore structure d, when using a board placed on the dock bottom C, the weight of the structure d is locally applied to the dock bottom C as a concentrated load via the board. Therefore, it is conceivable that the allowable loading capacity of the dock bottom C may be locally exceeded at the location where the plank board is installed.

ここに、盤木すの受圧面積を大きくしたり、或いは盤木
すの数を増やすことが考えられるが限度がありまた増や
すことにより作業環境も悪くなるのでこの方法には限界
がある。従って盤木すによる建造方法は作業上の種々の
利点がありながら安全上の制約から大重量の構造物ｄの
建造に採用できなかった。Here, it is possible to increase the pressure-receiving area of the board board or increase the number of board boards, but there is a limit to this method, and increasing the number of boards will worsen the working environment, so there is a limit to this method. Therefore, although the construction method using wooden boards has various advantages in terms of workability, it cannot be adopted for the construction of the heavy structure d due to safety constraints.

他方、特開昭５８−１７０Ｃｉ８４号公報では大型構造
物ｄを浮力で支え得る相当の大きさの浮体ｅやその係留
施設等が必要であり、殊に不使用期間中の経湾効率を考
えると問題がある。On the other hand, in JP-A-58-170Ci84, it is necessary to have a floating body e of considerable size that can support the large structure d with buoyancy, its mooring facilities, etc., especially considering the economical efficiency during periods of non-use. There's a problem.

［発明の目的コ 本発明は上述したような問題点に鑑みて創案されたもの
であり、その目的は盤木を介して加えられる構造物重量
がドック底の許容載荷重■を超える構造物を建造するに
際して、盤木の利点を活用しつつ、安全且つ経済的な建
造作業を施工させ１りる海洋浮上構造物の建造方法を提
供するにある。[Purpose of the Invention] The present invention was devised in view of the above-mentioned problems, and its purpose is to provide a structure in which the weight of the structure applied through the board exceeds the allowable load of the bottom of the dock. To provide a method for constructing an offshore floating structure that allows safe and economical construction work while making use of the advantages of boards.

［発明の概要］ ドック底に盤木を配設し、これら盤木上に構造物の構成
部材を搭載し結合して順次建造作業を進めると共に、こ
の建造過程においてドック内に順次注水して既に組立完
了された建造過程にある構造物に浮力を与え、盤木を介
してドック底に加えられる建造過程にある構造物の重量
がドック底の許容載荷重■を超えないようにして海洋浮
上構造物を建造するようにしたものである。[Summary of the invention] Boards are arranged at the bottom of the dock, structural members of the structure are mounted and connected on these boards, and the construction work is progressed sequentially, and during this construction process, water is sequentially poured into the dock to The floating structure is created by providing buoyancy to the structure in the construction process that has been assembled, and ensuring that the weight of the structure in the construction process, which is applied to the dock bottom via the board, does not exceed the allowable load of the dock bottom■. It was designed to help build things.

［実施例］ 以下に本発明を具体的に実施するための装置について説
明する。[Example] An apparatus for specifically implementing the present invention will be described below.

第１図に示すように１はドックであり、このドック１内
には建造される海洋浮上構造物の底部を支持させるため
の盤木２が適当な間隔で配設される。そしてこの盤木２
上に構造物３が下層から上層に向かって順次建造される
ようになっている。As shown in FIG. 1, 1 is a dock, and inside this dock 1, boards 2 for supporting the bottom of an offshore floating structure to be constructed are arranged at appropriate intervals. And this board 2
Structures 3 are constructed on top in order from the lower layer to the upper layer.

また盤木２は、構造物３相互の溶接継平部等接続箇所３
ａにできる限り干渉しないように配置され、また配置替
えも可能である。更に盤木２はドック底１ａの起伏、構
造物３の底部形状等に合わせてその高さが設定され安全
に構造物３を支持するようになっている。In addition, the board 2 has connection points 3 such as welded joints between the structures 3.
It is arranged so as not to interfere with a as much as possible, and the arrangement can also be rearranged. Furthermore, the height of the board 2 is set according to the undulations of the dock bottom 1a, the bottom shape of the structure 3, etc., so that it can safely support the structure 3.

また図示しないが、ドック１にはその内部に海水等を注
水して構造物に浮力を生じさせるためのポンプ等が欝え
られている。Although not shown, the dock 1 is equipped with a pump or the like for injecting seawater or the like into the dock 1 to create buoyancy in the structure.

以上のような具体的装置例に基づいて本発明の建造方法
について更に詳しく述べる。The construction method of the present invention will be described in more detail based on the above-mentioned specific example of the device.

第１図に示すように、先ずドック１のドック底１ａに適
当な間隔で盤木２を配設する。盤木２を配設したら、次
いでこれら盤木２上に構造物３の下層部分から順次積み
重ねて建造する。建造作業は予め陸上設備でブロック建
造したブロックを搬入して行なう所謂ブロック工法であ
っても、またドック１内に材料を搬入して直接組み立て
てゆく旧来の方法であっても良く、構造物の構成部材と
はいずれをも意味するものである。As shown in FIG. 1, first, boards 2 are placed on the bottom 1a of the dock 1 at appropriate intervals. After the boards 2 are arranged, structures 3 are then stacked on these boards 2 in order from the lower part to be built. Construction work may be carried out by the so-called block construction method, in which blocks are constructed in advance using onshore equipment, or by the traditional method in which materials are brought into the dock 1 and assembled directly. Component means any of the above.

ここに構造物３とドック底１ａとの間には盤木２によっ
て作業空間Ｓが形成され、構造物３の底部に対して所定
の作業を施工できる。即ち作業空間Ｓに諸機器を導入さ
せて、盤木２相互間であってドック底１ａへ臨む接続個
所３ａに接続作業を施し得、また盤木２の配置替えによ
り底部全面に６一 適切に塗装作業を施し得る。更に応力集中等の発生を防
止させて構造物をドック１内に安全に支持させることが
できる。このように盤木２の利点を充分に生かして構造
物の底部に適切な作業を行なうことができる。Here, a work space S is formed by the board 2 between the structure 3 and the dock bottom 1a, and a predetermined work can be performed on the bottom of the structure 3. That is, by introducing various devices into the work space S, it is possible to perform connection work at the connection point 3a between the boards 2 and facing the dock bottom 1a, and by rearranging the board 2, it is possible to perform connection work on the entire bottom surface of the board 2. Paint work can be applied. Furthermore, the structure can be safely supported within the dock 1 by preventing stress concentration from occurring. In this way, it is possible to take full advantage of the advantages of the board 2 and perform appropriate work on the bottom of the structure.

爾後、構造物は、その下層部分上に順次上層部分が組み
上げられて建造されてゆく。これに際し既に組立完了さ
れた建造過程にある構造物３の重量が増加し、盤木２を
介してドック底１ａに加えられる集中荷重も増加してゆ
く。ここに本発明にあっては、盤木２を介してドック底
１ａに作用する集中荷重がドック底１ａの許容載荷重量
に達する以前にポンプ等によりドック１内に注水を施す
。Thereafter, the structure is constructed by sequentially assembling the upper layer on top of the lower layer. At this time, the weight of the structure 3 that has already been assembled and is in the construction process increases, and the concentrated load applied to the dock bottom 1a via the board 2 also increases. According to the present invention, water is injected into the dock 1 using a pump or the like before the concentrated load acting on the dock bottom 1a via the board 2 reaches the allowable load capacity of the dock bottom 1a.

この注水は、既に組立完了された構造物３を浮上させる
ためではなく盤木２に加わる構造物３の重量を削減する
ように浮力を与えるものであり、盤木２には依然ある程
度の構造物重量を支持させるように行なわれる。即ち注
水は構造物重量が全て盤木２に作用しないように、浮力
で支持反力を補うようになされる。従って盤木２を介し
て作用される集中荷重がドック底１ａの許容載荷重量を
超える構造物であっても浮力で支持反力を補ってドック
１内で建造することができる。This water injection is not to levitate the structure 3 that has already been assembled, but to provide buoyancy to reduce the weight of the structure 3 added to the board 2, and the board 2 still has some structure. It is done to support weight. In other words, water is poured so that the entire weight of the structure does not act on the board 2, and the supporting reaction force is supplemented by buoyancy. Therefore, even if a structure is constructed in which the concentrated load applied through the planks 2 exceeds the allowable load capacity of the dock bottom 1a, it can be constructed within the dock 1 by supplementing the supporting reaction force with buoyancy.

本建造方法によれば大重量の構造物を建造するに際し、
ドツゲ底１ａへの耐圧限界を超える重量の影響を断つた
めに建造準備どして浮体を製作し用意したり、また浮体
を不使用期間中放置する等の不経済を排除できる。According to this construction method, when building a heavy structure,
In order to cut off the influence of weight exceeding the pressure limit on the box sole 1a, it is possible to eliminate uneconomical costs such as preparing and preparing a floating body during construction preparations, or leaving the floating body alone during periods when it is not in use.

また本方法は構造物重量をドック底１ａの耐圧限界内に
おいて盤木２にも支持させており構造物３が完全な浮遊
状態にないので、建造に際して構造物の偏荷重によるヒ
ール等の変動も防ぐことができ支持安定性に優れると共
に、係留ＩＭ設による係留作業も省略が可能である。In addition, in this method, the weight of the structure is supported by the board 2 within the pressure limit of the dock bottom 1a, and the structure 3 is not in a completely floating state, so there is no possibility of fluctuations in heel etc. due to unbalanced loads of the structure during construction. It is possible to prevent this from occurring, resulting in excellent support stability, and it is also possible to omit mooring work using a mooring IM installation.

尚、浮力で構造物Ｍ量を支持させると、ドック１内の壁
面に相当の水圧が作用するが、分布荷重として作用する
こととなり、ドック構造上安全である。Note that when the amount of structure M is supported by buoyancy, considerable water pressure acts on the wall surface inside the dock 1, but it acts as a distributed load and is safe from the viewpoint of the dock structure.

爾後、第３図に示すように、上層部分を順次建造しつつ
建造過程にある構造物３の重量の増加に応じて上述した
と同様な手順で注水を行なうことにより、ドック１内に
海洋浮上構造物が完成される。Thereafter, as shown in Figure 3, the upper part of the structure 3 is constructed one after another, and as the weight of the structure 3 increases in the construction process, water is injected in the same manner as described above. The structure is completed.

尚、完成した構造物はドック１内への注水を行なうこと
により浮上され、爾後曳船等により曳航させてドック１
外へ進水されることになる。The completed structure is floated by injecting water into Dock 1, and then towed by a tugboat or the like to Dock 1.
It will be launched outside.

また、上述した建造期間中においては、構造物の形態に
よっては局部的に異なる浮力が発生する場合もあるが、
浮力の過大な構造物部分にバラスト等を積載することに
より全体の浮力バランスをとることもできる。Also, during the construction period mentioned above, depending on the form of the structure, locally different buoyancy may occur;
It is also possible to balance the overall buoyancy by loading ballast or the like on parts of the structure that have excessive buoyancy.

［発明の効果］ 以上本発明によれば次のような優れた効果を発揮する。[Effect of the invention] As described above, according to the present invention, the following excellent effects are exhibited.

大重量の海洋浮上構造物を建造するに際し、盤木の支持
反力と順次構造物に与えられる浮力とによって構造物重
量を支持させるようにしたので、ドック底の許容載荷重
」を超える構造物であってもそのｆ！量を削減する効果
を得ることができると共に、盤木の利点を充分に活用で
き、また構造物を完全に浮上させないため係留１ｉｆｉ
段の省略や最小限の注水量で済む等、安全且つ経済的な
建造作業を達成できる。When constructing a heavy offshore floating structure, the weight of the structure is supported by the supporting reaction force of the planks and the buoyant force sequentially applied to the structure, so the structure exceeds the allowable load on the bottom of the dock. Even if that f! In addition to being able to obtain the effect of reducing the amount of mooring, it is possible to fully utilize the advantages of the board, and because the structure is not completely floated, the mooring 1ifi
Safe and economical construction work can be achieved, such as by omitting steps and requiring a minimum amount of water injection.

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

第１図〜第３図は本発明の好適一実施例を示す工程図、
第４図及び第５図は従来例を示すドックの正面断面図で
ある。 図中、１はドック、１ａはドック底、２は盤木、３は建
造過程にある構造物である。 特許出願人　　石川島播＠重工業株式会社代理人弁理士
　　絹　　谷　　信　　雄第１図 第３図 （１開’１４６１−６ＤＺＨＵＬ４Ｊ 丑丑」1 to 3 are process diagrams showing a preferred embodiment of the present invention,
4 and 5 are front sectional views of a conventional dock. In the figure, 1 is a dock, 1a is a dock bottom, 2 is a board, and 3 is a structure in the construction process. Patent applicant Haru Ishikawajima@Heavy Industries Co., Ltd. Representative Patent Attorney Nobuo Kinutani Figure 1 Figure 3 (1 release '1461-6DZHUL4J Ushiu)

Claims (1)

【特許請求の範囲】[Claims] ドック内において該ドック底の許容載荷重量を超える重
量を有する海洋浮上構造物を建造するに際して、上記ド
ック底に盤木を配設し、該盤木上に構造物の構成部材を
搭載し結合して順次建造作業を進めると共に、この建造
過程において上記盤木を介して上記ドック底に加えられ
る建造過程にある構造物の重量が、該ドック底の許容載
荷重量を超えないように該建造過程にある構造物に浮力
を生じさせるべく上記ドック内に順次注水しつつ海洋浮
上構造物を建造するようにしたことを特徴とする海洋浮
上構造物の建造方法。When constructing an offshore floating structure in a dock whose weight exceeds the allowable load capacity of the dock bottom, a board is provided at the bottom of the dock, and the structural members of the structure are mounted and connected on the board. While proceeding with the construction work in sequence, measures are taken during the construction process to ensure that the weight of the structure being added to the bottom of the dock via the board during this construction process does not exceed the allowable load capacity of the bottom of the dock. A method for constructing an ocean floating structure, characterized in that the ocean floating structure is built while sequentially injecting water into the dock in order to create buoyancy in the structure.