JPH07122244B2 - Offshore structure maintenance equipment - Google Patents
Offshore structure maintenance equipmentInfo
- Publication number
- JPH07122244B2 JPH07122244B2 JP30880686A JP30880686A JPH07122244B2 JP H07122244 B2 JPH07122244 B2 JP H07122244B2 JP 30880686 A JP30880686 A JP 30880686A JP 30880686 A JP30880686 A JP 30880686A JP H07122244 B2 JPH07122244 B2 JP H07122244B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- work
- telescopic
- marine structure
- working
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000012423 maintenance Methods 0.000 title claims description 14
- 238000012856 packing Methods 0.000 claims description 21
- 239000013535 sea water Substances 0.000 description 8
- 230000008602 contraction Effects 0.000 description 4
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000003566 sealing material Substances 0.000 description 2
- 235000015170 shellfish Nutrition 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、海中に立設されている脚柱のような海洋構造
物の保守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 maintenance device for an offshore structure such as a pillar that is erected in the sea.
（従来の技術） 海底から直立されている脚柱の保守装置について説明す
ると、第２図に示すように海底から直立され上部で構造
物（ｂ）を支承している脚柱（ａ）の周囲に、作業空間
（ｄ）を形成するように２つ割れの円筒部材（ｃ）
（ｃ）を配置して、円筒部材（ｃ）（ｃ）のリブ（c1）
部にシール材などを施し複数のボルト（ｅ）（ｅ）で結
合して作業用円筒体（c,c）とし、作業用円筒体（c,c）
の底部（c2）に設けたエアパツキン（ｆ）を膨張させて
水密に配設して、作業用円筒体（c,c）内の海水を排出
して作業空間（ｄ）を形成し、作業空間（ｄ）内に作業
員が入り脚柱（ａ）の腐蝕などの状態を定期的に検査
し、補修などを行うことが考えられている。(Prior Art) Explaining a maintenance device for a pedestal standing upright from the seabed, as shown in FIG. 2, the periphery of the pedestal (a) standing upright from the seabed and supporting the structure (b) at the upper part. A cylindrical member (c) that is split into two to form a working space (d).
(C) is arranged, the rib (c 1 ) of the cylindrical member (c) (c)
The work cylinder (c, c) is made by applying a sealing material to the part and connecting it with multiple bolts (e) (e) to make the work cylinder (c, c).
The air packing (f) provided on the bottom portion (c 2 ) of the work is inflated and arranged in a watertight manner, and the seawater in the working cylinder (c, c) is discharged to form the working space (d). It is considered that a worker enters the space (d) and periodically inspects the pedestal (a) for a condition such as corrosion and performs repairs.
（発明が解決しようとする問題点） 従来の前記海洋構造物保守装置は、海洋構造物（脚柱）
の周囲に１本の作業用円筒体を組立てる構造であるた
め、海面下深くまで達するように作業用円筒体を長尺に
すると、海面下の組立作業に困難を来し多量の海水排出
が必要になるとともに、エアパツキンの水密性を得るた
めに海面下深く潜水して貝類などの付着物除去作業が必
要となり、さらに作業用円筒体の配置変えごとに前記付
着物除去とともに多量の際水排出が必要になつて、作業
能率が悪く作業用円筒体の長尺化には自ら限界があり、
海洋構造物の深部の保守作業ができないなどの問題点が
ある。(Problems to be Solved by the Invention) The conventional offshore structure maintenance device is an offshore structure (post).
Since one work cylinder is assembled around the sea, if the work cylinder is made long so as to reach deep below the sea level, it will be difficult to assemble below the sea level and a large amount of seawater must be discharged. In addition, in order to obtain the watertightness of the air packing, it is necessary to dive deep under the sea surface to remove deposits such as shellfish.In addition, each time the working cylinder is relocated, the deposits are removed and a large amount of water is discharged. As a result, work efficiency is poor and there is a limit to the lengthening of the work cylinder,
There are problems such as the inability to perform maintenance work in deep areas of offshore structures.
（問題点の解決手段） 本発明は、前記のような問題点に対処するために開発さ
れた海洋構造物保守装置であつて、海中に立設されてい
る海洋構造物の周囲に作業空間を形成して囲み昇降可能
に配設される作業用筒部と、該作業用筒部にシールリン
グを介して下側へ伸縮可能に嵌装され伸縮操作機構を介
して延設された伸縮筒部を有し、前記作業用筒部と前記
伸縮筒部の各底板に前記海洋構造物との間の水密用エア
パツキンを設け、前記作業用筒部内と前記伸縮筒部内に
前記海洋構造物へ進退される固定用のキヤツチヤを設け
たことにより、海洋構造物の周囲への配設性能を向上さ
せて保守作業能率を高め前記のような問題点を解消して
いる。(Means for Solving Problems) The present invention is a marine structure maintenance device developed to cope with the above problems, in which a work space is provided around an offshore structure that is erected in the sea. A work cylinder portion that is formed to surround the work cylinder and that can be moved up and down, and a telescopic cylinder portion that is fitted to the work cylinder portion so as to be extendable downward through a seal ring and that is extended through a telescopic operation mechanism. Having a watertight air packing between the marine structure on each of the bottom plates of the working cylinder and the telescopic cylinder, and moving to and from the marine structure in the working cylinder and the telescopic cylinder. By providing the fixing chuck, the performance of arranging the marine structure around the marine structure is improved, the maintenance work efficiency is improved, and the above-mentioned problems are eliminated.
（作 用） 海洋構造物の周囲に作業用筒部を配置して海洋構造物に
キヤツチヤで固定しエアパツキンを膨張させて水密にす
るとともに、作業用筒部に伸縮筒部を短縮状態で嵌装し
同様にキヤツチヤで固定しエアパツキンを膨張させて水
密とし、作業用筒部内および伸縮筒部内の海水を排出す
ると、作業用筒部内の海洋構造物周囲に作業空間が形成
されて保守作業が可能となり、次に、伸縮筒部のエアパ
ツキン、キヤツチヤおよび伸縮操作機構による下降延量
の操作と、作業用筒部のエアパツキン、キヤツチヤおよ
び伸縮操作機構による下降の操作により、海洋構造物の
下方周囲に作業空間が形成され、海洋構造物の海面下深
い部分まで作業空間が順次に形成されて保守作業が可能
となり、作業用筒部および伸縮筒部の両底板に設けた２
重のエアパツキンにより水密性が確保されるとともに、
作業用筒部の下降配置変更時における海水排出量が著し
く減少される。(Working) Place a work cylinder around the offshore structure and fix it to the offshore structure with a cache to expand the air packing to make it watertight and fit the work cylinder with the telescopic cylinder shortened. Similarly, if you fix it with a cache and expand the air packing to make it watertight, and discharge the seawater in the work cylinder and the telescopic cylinder, a work space will be formed around the marine structure in the work cylinder and maintenance work will be possible. Next, the work space around the lower part of the marine structure is controlled by the operation of the air packing of the telescopic cylinder part, the catch, and the extension operation mechanism, and the operation of the air packing of the work cylinder part, the catch, and the extension operation mechanism. Is formed, and the working space is sequentially formed to the deep part of the ocean structure below the sea surface, and maintenance work can be performed.
Water tightness is secured by heavy air packing,
The amount of seawater discharge when the lowering arrangement of the work cylinder is changed is significantly reduced.
（実施例） 第１図に本発明の一実施例を示し、図柱（ａ）は海中に
立設されている海洋構造物（脚柱）、（ｂ）は海洋構造
物（ａ）の上部で支承されている構造物であつて、海洋
構造物（ａ）の周囲に作業空間（10）を形成して囲み昇
降可能に配設される作業用筒部（１）と、作業用筒部
（１）にシールリング（12）を介して下側へ伸縮可能に
嵌装され伸縮操作機構（21）を介して延設された伸縮筒
部（11）を有し、作業用筒部（１）の底板（３）と伸縮
筒部（11）の底板（13）の各内腔部に海洋構造物（ａ）
との間の水密用エアパツキン（５）（15）を設け、作業
用筒部（１）内と伸縮筒部（11）内に油圧シリンダ
（６）（16）で海洋構造物（ａ）へ進退される固定用キ
ヤツチヤ（７）（17）を設けた構成になつている。(Embodiment) FIG. 1 shows an embodiment of the present invention, wherein a pillar (a) is an offshore structure (post) standing upright in the sea, and (b) is an upper part of the offshore structure (a). A structure supported by a work cylinder (1), which surrounds a marine structure (a) to form a work space (10), is surrounded by the work cylinder (1), and a work cylinder (1). The work tube portion (1) has a telescopic tube portion (11) which is fitted to the lower part (1) so as to be able to extend and contract downward through a seal ring (12) and extends through the telescopic operation mechanism (21). ) The bottom plate (3) and the bottom plate (13) of the telescopic cylinder part (11) in each lumen of the marine structure (a).
A watertight air packing (5) (15) is provided between the marine structure (a) and the telescopic cylinder (1) and the telescopic cylinder (11) with hydraulic cylinders (6) (16). It has a structure in which the fixed fixing chucks (7) and (17) are provided.
さらに詳述すると、前記作業用筒部（１）、伸縮筒部
（11）は、例えば、２つ割れ筒部材をリブ部分にてシー
ル材などを介しボルト、ナツトなどで連結することによ
り、海洋構造物（ａ）の横断形状と同様な大径の横断面
形状に形成される。More specifically, the working cylinder portion (1) and the telescopic cylinder portion (11) are, for example, a seam by connecting a two-split cylinder member at the rib portion with a seal material or the like with bolts or nuts. It is formed in a large-diameter cross-sectional shape similar to the cross-sectional shape of the structure (a).
前記エアパツキン（５）（15）は、底板（３）（13）の
内腔部内に配設されリング形状をなし、作業空間（10）
内さらには海面上の構造物（ｂ）側の圧気供給源からエ
アホース（図示省略）を介し遠隔操作により膨縮操作さ
れて、底板（３）（13）と海洋構造物（ａ）の周面間を
水密としあるいは同周面から後退して作業用筒部
（１）、伸縮筒部（11）の昇降を可能とする。The air packs (5) (15) are arranged in the inner cavity of the bottom plates (3) (13) and have a ring shape, and the work space (10)
The bottom plate (3) (13) and the peripheral surface of the marine structure (a) are expanded and contracted by a remote operation from a compressed air supply source on the side of the structure (b) inside and further on the sea surface via an air hose (not shown). The space is made watertight or retreats from the same circumferential surface so that the work cylinder part (1) and the telescopic cylinder part (11) can be moved up and down.
前記キヤツチヤ（７）（17）は、作業用筒部（１）、伸
縮筒部（11）の内側に設けた支持部材上にそれぞれ複数
個配設され、図示のように各油圧シリンダ（６）（16）
により海洋構造物（ａ）周囲の複数個所に当接し、海洋
構造物（ａ）の周囲に作業用筒部（１）、伸縮筒部（1
1）を所定配置にして固定する。A plurality of the chucks (7) and (17) are respectively arranged on the supporting members provided inside the working cylinder (1) and the telescopic cylinder (11), and as shown in the figure, each hydraulic cylinder (6). (16)
Abutting on a plurality of places around the marine structure (a), and around the marine structure (a), a working cylinder (1) and a telescopic cylinder (1
Place 1) in place and fix.
前記伸縮操作機構（21）は、作業用筒部（１）の底板
（３）と伸縮筒部（11）の底板（13）間に複数個の油圧
シリンダを連結して配設された構成になつており、構造
物（ｂ）側あるいは作業空間（10）に設けた油圧制御機
構（図示省略）で遠隔操作される。The extension / contraction operation mechanism (21) has a structure in which a plurality of hydraulic cylinders are connected between the bottom plate (3) of the work cylinder part (1) and the bottom plate (13) of the expansion and contraction cylinder part (11). It is remotely operated by a hydraulic control mechanism (not shown) provided on the structure (b) side or the work space (10).
前記作業空間（10）内および底板（３）と（13）間の伸
縮空間（20）内には、海面上の構造物（ｂ）から操作さ
れる海水排出管（24）が延設されている。In the working space (10) and in the expansion / contraction space (20) between the bottom plates (3) and (13), a seawater discharge pipe (24) operated from the structure (b) on the sea surface is extended. There is.
また、伸縮筒部（11）の下板部（23）の内端側にスクレ
ーパ（25）を配設し、水圧または油圧モータ（27）など
により歯車（26）を介してスプレーパ（25）を駆動し、
海洋構造物（ａ）周囲の貝類などの付着物を除去する。
前記モータ（27）は適宜の遠隔制御機構（図示省略）に
より操作される。Further, a scraper (25) is arranged on the inner end side of the lower plate part (23) of the telescopic cylinder part (11), and the sprayer (25) is moved via the gear (26) by water pressure or a hydraulic motor (27). Drive,
Remove the deposits such as shellfish around the marine structure (a).
The motor (27) is operated by an appropriate remote control mechanism (not shown).
さらに、必要に応じて作業用筒部（１）の上部には、シ
ール材を介しボルトナツト等で連結筒部（31）が連結さ
れ、該連結筒部（31）内にはリンク（32）を介してガイ
ドローラ（33）が付設されて海洋構造物（ａ）の周囲に
対する配置と昇降が円滑になつており、該連結筒部（3
1）は、滑車（34）、ローラ（36）で案内されたワイヤ
ロープ（35）で吊持され構造物（ｂ）上のウインチ（3
7）で昇降操作され、また、前記ワイヤロープ（35）
は、作業用筒部（１）を直接に吊持するように配置し、
かつ昇降させることもできる。Furthermore, if necessary, a connecting cylinder part (31) is connected to the upper part of the work cylinder part (1) with a bolt nut or the like via a sealing material, and a link (32) is provided in the connecting cylinder part (31). A guide roller (33) is attached via the guide roller (33) so that the marine structure (a) can be smoothly placed and moved up and down with respect to the surroundings.
1) is a winch (3) that is suspended by a wire rope (35) guided by a pulley (34) and a roller (36) on a structure (b).
It is lifted and lowered by 7), and the wire rope (35)
Is arranged so as to directly suspend the working cylinder (1),
It can also be raised and lowered.
本発明の実施例は、前記のような構成になつており、作
用について説明すると、海洋構造物（ａ）周囲の海面付
近で作業用筒部（１）を適宜手段で組立てキヤツチヤ
（７）を進出させて固定しエアパツキン（５）を膨張さ
せて水密とし、同作業用筒部（１）に伸縮筒部（11）が
短縮した状態で組立てられキヤツチヤ（17）で固定され
エアパツキン（15）を膨張させて水密とし、適宜の手段
により作業空間（10）および伸縮空間（20）内の海水を
排出すると、作業空間（10）内に入つて海洋構造物
（ａ）周面の付着物の除去、検査、補修などの作業がで
きる。The embodiment of the present invention is configured as described above. To explain the operation, the working cylinder portion (1) is assembled by an appropriate means near the sea surface around the marine structure (a), and the chuck (7) is assembled. It is advanced and fixed to expand the air packing (5) to make it watertight, and then it is assembled to the work cylinder (1) with the telescopic cylinder (11) shortened and fixed by the chuck (17) to fix the air packing (15). When it is expanded to be watertight and the seawater in the working space (10) and the expansion / contraction space (20) is discharged by an appropriate means, it enters the working space (10) and removes the deposits on the peripheral surface of the marine structure (a). Can perform inspection, repair, and other work.
海洋構造物（ａ）のさらに下側を検査する際は、エアパ
ツキン（15）のエアを抜き縮小させキヤツチヤ（17）を
後退させて伸縮操作機構（21）の油圧シリンダを伸長
し、伸縮筒部（11）を下降しキヤツチヤを進出させて固
定しエアパツキン（15）に圧気を供給して膨張させて水
密にしたのち、エアパツキン（５）を縮小しキヤツチヤ
（７）を後退させて伸縮操作機構（21）の油圧シリンダ
を短縮して、作業用筒部（１）を下降しキヤツチヤを進
出させて固定しエアパツキンを膨張させて水密にし、海
水を排出することにより作業空間（10）が海洋構造物
（ａ）の下側に変更され同下側の保守作業が可能とな
る。When inspecting the lower side of the marine structure (a) further, the air of the air packing (15) is deflated and retracted, the catcher (17) is retracted, and the hydraulic cylinder of the telescopic operation mechanism (21) is extended to expand the telescopic cylinder part. After lowering (11) and advancing and fixing the catcher, pressure air is supplied to the air packing (15) to expand it to make it watertight, and then the air packing (5) is contracted and the chuck (7) is retracted to expand and contract the operating mechanism ( The hydraulic cylinder of 21) is shortened, the working cylinder (1) is lowered, the catcher is advanced and fixed, the air pack is expanded to make it watertight, and the sea space is discharged so that the working space (10) becomes an offshore structure. It is changed to the lower side of (a), and maintenance work of the lower side becomes possible.
伸縮筒部（11）の下降時に、スクレーパ（25）を駆動し
て海洋構造物（ａ）周囲の付着物などを除去でき、エア
パツキンの損傷を防止しその水密性を得られるととも
に、保守作業が容易となる。When the telescopic cylinder part (11) descends, the scraper (25) can be driven to remove deposits and the like around the marine structure (a), prevent damage to the air packing and obtain its watertightness, as well as maintenance work. It will be easy.
作業用筒部（１）の上部が海面下になる場合は、連結筒
部（31）を上方へ延設することにより作業用筒部（１）
をさらに海面下深くまで下降設置可能となり、ウインチ
（37）から繰り出されたワイヤロープ（35）により各筒
部の配置や昇降が円滑に行われ、かつ緊急時の補助装置
としての役割をなす。When the upper part of the work cylinder (1) is below the sea level, the work cylinder (1) is extended by extending the connecting cylinder (31) upward.
Can be installed deeper below the sea level, and the wire rope (35) fed from the winch (37) smoothly arranges and raises and lowers each tubular portion, and also serves as an auxiliary device in an emergency.
昇降操作機構は、油圧シリンダに代えて回転機、歯車等
による伸縮機構にすることも可能である。Instead of the hydraulic cylinder, the lifting operation mechanism may be a telescopic mechanism including a rotating machine and gears.
前記装置の海面上への上昇は、逆操作により行われる。The ascent of the device above sea level is carried out in reverse.
（発明の効果） 本発明は、前述のような構成になつており、海洋構造物
の周囲に作業用筒部を配置して海洋構造物にキヤツチヤ
で固定しエアパツキンで水密にするとともに、同作業用
筒部に短縮状態で伸縮筒部を短縮状態で嵌装し同様にキ
ヤツチヤで固定しエアパツキンで水密とし、海水を排出
することにより、作業用筒部内の作業空間で海洋構造物
の保守作業ができ、伸縮筒部のエアパツキン、キヤツチ
ヤおよび下降の操作と、作業用筒部のエアパツキン、キ
ヤツチヤおよび下降の操作、さらに海水排出により、海
洋構造物の海面下深い部分まで作業空間が順次に形成さ
れ、比較的に簡単な操作により容易に東洋構造物の深い
部分まで作業空間を形成でき、海洋構造物の保守作業を
容易に高能率で遂行できる。(Effects of the Invention) The present invention has the above-described configuration, and arranges a work cylinder portion around a marine structure to fix it to the marine structure with a cache to make it watertight with an air packing, and to perform the same work. By fitting the telescopic cylinder part in the contracted state in the contracted state in the contracted state, fixing it similarly with the cache, making it watertight with the air packing, and discharging seawater, the maintenance work of the marine structure can be performed in the work space in the working cylinder part. Yes, the operation of the air packing of the telescopic cylinder, the catch and the descending operation, the operation of the air packing of the working cylinder, the catch and the descending operation, and the discharge of seawater, the working space is sequentially formed to the deep portion below the sea surface of the marine structure, With a relatively simple operation, a working space can be easily formed to a deep part of the oriental structure, and maintenance work of the marine structure can be easily performed with high efficiency.
以上本発明を実施例について説明したが、勿論本発明は
このような実施例にだけ局限されるものではなく、本発
明の精神を逸脱しない範囲内で種々の設計の改変を施し
うるものである。Although the present invention has been described with reference to the embodiments, the present invention is of course not limited to such embodiments, and various design modifications can be made without departing from the spirit of the present invention. .
第１図は本発明の一実施例を示す縦断面図、第２図は従
来例を示す縦断面図、第３図は第２図のII−II部分の断
面図である。 a:海洋構造物、1:作業用筒部 3,13:底板、5,15:エアパツキン 7,17:キヤツチヤ、11:伸縮筒部 12:シールリング、21:伸縮操作機構FIG. 1 is a vertical sectional view showing an embodiment of the present invention, FIG. 2 is a vertical sectional view showing a conventional example, and FIG. 3 is a sectional view taken along the line II-II in FIG. a: Offshore structure, 1: Working cylinder 3,13: Bottom plate, 5,15: Air packing 7,17: Chatter, 11: Telescopic cylinder 12: Seal ring, 21: Telescopic operation mechanism
Claims (1)
作業空間を形成して囲み昇降可能に配設される作業用筒
部と、該作業用筒部にシールリングを介して下側へ伸縮
可能に嵌装され伸縮操作機構を介して延設された伸縮筒
部を有し、前記作業用筒部と前記伸縮筒部の各底板に前
記海洋構造物との間の水密用エアパツキンを設け、前記
作業用筒部内と前記伸縮筒部内に前記海洋構造物へ進退
される固定用のキヤツチヤを設けたことを特徴とする海
洋構造物保守装置。Claims: 1. A work cylinder part which surrounds a marine structure standing upright in the sea to form a work space, and which is arranged so as to be movable up and down, and a lower part of the work cylinder part via a seal ring. Has a telescopic tube portion that is fitted to the side so as to be able to extend and contract and is extended via a telescopic operation mechanism, and a watertight air packing between the marine structure on each of the bottom plates of the working tube portion and the telescopic tube portion. An offshore structure maintenance device is provided, in which a fixing chuck for advancing and retracting to and from the marine structure is provided in the working cylinder portion and the telescopic cylinder portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30880686A JPH07122244B2 (en) | 1986-12-26 | 1986-12-26 | Offshore structure maintenance equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30880686A JPH07122244B2 (en) | 1986-12-26 | 1986-12-26 | Offshore structure maintenance equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63165606A JPS63165606A (en) | 1988-07-08 |
| JPH07122244B2 true JPH07122244B2 (en) | 1995-12-25 |
Family
ID=17985535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30880686A Expired - Lifetime JPH07122244B2 (en) | 1986-12-26 | 1986-12-26 | Offshore structure maintenance equipment |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07122244B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6636868B2 (en) * | 2016-06-27 | 2020-01-29 | 鹿島建設株式会社 | Marine organism adhesion control device and marine organism adhesion control method |
| CN112389613A (en) * | 2020-12-10 | 2021-02-23 | 青岛深蓝水下工程技术有限公司 | Supporting structure for underwater equipment protection cover plate |
-
1986
- 1986-12-26 JP JP30880686A patent/JPH07122244B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63165606A (en) | 1988-07-08 |
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