JPH0471595B2 - - Google Patents
Info
- Publication number
- JPH0471595B2 JPH0471595B2 JP63210134A JP21013488A JPH0471595B2 JP H0471595 B2 JPH0471595 B2 JP H0471595B2 JP 63210134 A JP63210134 A JP 63210134A JP 21013488 A JP21013488 A JP 21013488A JP H0471595 B2 JPH0471595 B2 JP H0471595B2
- Authority
- JP
- Japan
- Prior art keywords
- rod
- compressed air
- air
- swivel
- water
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 230000008929 regeneration Effects 0.000 claims description 3
- 238000011069 regeneration method Methods 0.000 claims description 3
- 235000019688 fish Nutrition 0.000 description 18
- 241000251468 Actinopterygii Species 0.000 description 17
- 241001474374 Blennius Species 0.000 description 12
- 241000195493 Cryptophyta Species 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 235000015170 shellfish Nutrition 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 241000195474 Sargassum Species 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 241000272525 Anas platyrhynchos Species 0.000 description 1
- 241000512259 Ascophyllum nodosum Species 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 241001125046 Sardina pilchardus Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 241001261506 Undaria pinnatifida Species 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 235000019512 sardine Nutrition 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/80—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in fisheries management
- Y02A40/81—Aquaculture, e.g. of fish
Description
【発明の詳細な説明】
(イ) 技術分野
本発明は、ウオータージエツトを利用して魚礁
のような水中構造物や自然の岩礁等に繁茂・付着
している海草や貝類を除去して表面を再生する装
置に関するものである。[Detailed Description of the Invention] (a) Technical Field The present invention utilizes a water jet to remove seaweed and shellfish that are growing and attached to underwater structures such as fish reefs and natural rock reefs, and to remove them from the surface. The present invention relates to a device for reproducing .
(ロ) 背景技術
水産資源の保護育成のため、近時海岸近傍には
計画的に魚礁が数多く敷設されている。(b) Background Art In order to protect and nurture marine resources, many fish reefs have recently been systematically constructed near the coast.
この魚礁には、敷設後時間が経過するにしたが
つて雑藻であるスガモやホンダワラ等の海草が繁
茂したり貝類が付着し、魚の棲息環境としては好
ましくない状態となるので、この海草等を除去す
る必要がある。 As time passes after the reef is constructed, seaweed such as sardine algae and sargassum grows thick, and shellfish become attached to the reef, making it an unfavorable habitat for fish. Needs to be removed.
しかしながら、従来のこの海草等の除去作業は
専ら潜水夫によるケレン等を使用した手作業で行
われており、作業が海中であること、波浪の影響
があること、魚礁の形が立体的であること等か
ら、作業能率が非常に悪く、効果的な除去装置の
開発が望まれていた。 However, conventional removal work of seaweed, etc. is carried out manually by divers using kerens, etc., and the work is carried out underwater, is affected by waves, and the shape of the reef is three-dimensional. For this reason, the work efficiency is very poor, and there has been a desire to develop an effective removal device.
(ハ) 発明の開示
本発明は、土や岩石などの切削、切断等に使用
されるウオータージエツト技術を利用し、これを
改良して魚礁や岩礁に繁茂している海草や付着し
た貝類を能率よく除去する水中構造物等の表面再
生装置を提供するものである。(c) Disclosure of the invention The present invention utilizes waterjet technology used for cutting and cutting soil, rocks, etc., and improves this technology to eliminate seaweed and attached shellfish that grow on fish reefs and rocky reefs. The present invention provides a surface regeneration device for underwater structures, etc., which is efficiently removed.
一般に、ウオータージエツトは大気中では切削
能率がよいが、水中ではその能率が極端に低下す
る。特にこの現象は、深度が深くなるほど（即
ち、静水圧が増加するほど）その有効射程距離が
短くなる。 In general, waterjet has good cutting efficiency in the atmosphere, but its efficiency drops dramatically in water. In particular, the effective range of this phenomenon decreases as the depth increases (ie, as the hydrostatic pressure increases).
従つて、単にこのウオータージエツトにより魚
礁等の海草を除去しようとしても、効果的な除去
を行うことができない。 Therefore, even if an attempt is made to remove seaweed such as fish reefs simply by using this water jet, effective removal cannot be achieved.
そこで、本発明はウオータージエツトの水噴流
ノズルの周囲に空気噴流を噴射する円環状ノズル
を設けることにより、水中における水噴流の有効
射程距離を延ばし、さらにこれらノズルを複数備
えた支持体全体を回転させることによつて上記水
噴流ノズルを有効に利用し、海草等の除去効率の
向上を図るものである。 Therefore, the present invention extends the effective range of the water jet underwater by providing an annular nozzle that sprays an air jet around the water jet nozzle. By rotating the water jet nozzle, the water jet nozzle is effectively used to improve the efficiency of removing seaweed and the like.
以下、本発明の実施例を図により説明する。 Embodiments of the present invention will be described below with reference to the drawings.
(ニ) 実施例
第１図は本発明装置の原理図であり、１はその
中間部を内外二重管のロツド２下端に直角に取り
つけられた水平な筒状支持体（モニター）で、該
支持体１には後記するようにジエツト水と圧縮空
気を同時に噴出するノズル９が複数設けられてい
る。(d) Embodiment Figure 1 is a diagram showing the principle of the device of the present invention, in which 1 is a horizontal cylindrical support (monitor) whose middle part is attached at right angles to the lower end of rod 2, which is a double pipe inside and outside. The support body 1 is provided with a plurality of nozzles 9 that eject jet water and compressed air simultaneously, as will be described later.
３は上記ロツド２上端に接続された二重スイベ
ルで、その外側に設けられたエアモーター、電動
モーター、油圧モーターなどの回転駆動部４によ
り（必要により減速器を介して）自在に支持さ
れ、該スイベル３の回転によつて下端の支持体１
が水平回転するようになつている。 Reference numeral 3 denotes a double swivel connected to the upper end of the rod 2, which is freely supported by a rotary drive unit 4 such as an air motor, an electric motor, or a hydraulic motor (via a speed reducer if necessary) provided on the outside of the double swivel. By rotating the swivel 3, the lower end support 1
is now rotating horizontally.
５は上記スイベル３を介してロツド２の内管２
ａ内に高圧水を供給する高圧水供給管、６は同じ
くロツド２の外管２ｂ内に圧縮空気を供給する圧
縮空気供給管であり、７は上記エアモーター４を
回転駆動するための給気管、８はその排気管であ
る。 5 connects the inner pipe 2 of the rod 2 via the swivel 3.
6 is a compressed air supply pipe that supplies compressed air to the outer pipe 2b of the rod 2; 7 is an air supply pipe for rotationally driving the air motor 4; , 8 is its exhaust pipe.
第２〜４図に示すように、支持体１内には前記
ロツド内管２ａと連通する水通路１０、ならびに
ロツド外管２ｂと連通する空気通路１１がそれぞ
れ形成され、該支持体１には左右両端に各１個と
下面に４個の合計６個のノズル９が設けれて、各
ノズル９はそれぞれ上記水通路１０及び空気通路
１１を介してその中心からジエツト水が、またそ
の周囲からは圧縮空気が噴出するよう構成されて
いる。 As shown in FIGS. 2 to 4, a water passage 10 communicating with the rod inner tube 2a and an air passage 11 communicating with the rod outer tube 2b are formed in the support 1, respectively. A total of six nozzles 9 are provided, one each on the left and right ends and four on the bottom surface, and each nozzle 9 receives jet water from the center and from the periphery through the water passage 10 and air passage 11, respectively. is configured to emit compressed air.
第５図はロツド２上端の二重スイベル３とエア
モーター４の機構の一例を示すもので、第１図で
は前記したように該スイベル３内には上方から高
圧水と圧縮空気を供給し、エアモーター４には別
系統で圧縮空気を供給する様にしているが、この
第５図では上方からスイベル３内に圧縮空気を供
給せず、エアモーター４を回転駆動する圧縮空気
を排気管３から直ちに排気するのではなく、その
ままその圧縮空気を使用してスイベル３内に導入
し、ロツド外管２ｂ内へ供給するようになつてい
る。 FIG. 5 shows an example of the mechanism of the double swivel 3 at the upper end of the rod 2 and the air motor 4. In FIG. 1, as described above, high pressure water and compressed air are supplied into the swivel 3 from above. Compressed air is supplied to the air motor 4 from a separate system, but in this Fig. 5, compressed air is not supplied from above into the swivel 3, but the compressed air that drives the air motor 4 is supplied to the exhaust pipe 3. Instead of immediately exhausting the air, the compressed air is directly introduced into the swivel 3 and supplied into the rod outer tube 2b.
即ち、第５図中１２は前記高圧水供給管５に連
通しスイベル３軸心を貫通する通水部、１３は該
通水部１２周囲に形成された通気部でありこのよ
うに内外二重に構成された二重スイベル３はその
外側のエアモーター４内にベアリング１４により
回転自在に支持され、エアモーター用圧縮空気供
給管７からその供給口７ａを介してモーター４内
に送気された圧縮空気はスイベル３外周面に形成
されたフイン２１に衝突して該スイベル３を回転
させながら通気部１３内に入り、ロツド外管２ｂ
内へ送られる。これにより、ロツド２下端の支持
体１が水平回転せられると共に、圧縮空気は該支
持体１に設けられたノズル９から噴出することに
なる。 That is, in FIG. 5, 12 is a water passage part that communicates with the high-pressure water supply pipe 5 and passes through the three axes of the swivel, and 13 is a ventilation part formed around the water passage part 12. The double swivel 3 configured as shown in FIG. The compressed air collides with the fins 21 formed on the outer peripheral surface of the swivel 3, rotates the swivel 3, and enters the ventilation section 13, causing the rod outer tube 2b to flow.
sent inward. As a result, the support 1 at the lower end of the rod 2 is horizontally rotated, and compressed air is ejected from the nozzle 9 provided on the support 1.
なお、ノズル９から噴出する圧縮空気の空気圧
が低すぎるような場合には、第１図に示すように
二重スイベル３内に供給する圧縮空気はエアモー
ター４を駆動する圧縮空気とは別系統にした方が
良い。 Note that if the air pressure of the compressed air jetted from the nozzle 9 is too low, the compressed air supplied to the double swivel 3 is routed through a separate system from the compressed air that drives the air motor 4, as shown in FIG. It is better to
しかして、海底に設置された魚礁１９に付着繁
茂している海草や貝類を除去する場合、作業場所
が陸地から比較的離れているときには、ノズル支
持体１に高圧水を供給するための高圧水ポンプ１
５、圧縮空気を供給するエアコンプレツサ１６な
らびにゼネレーター１７を全て作業船に積み込ん
でもよいが、陸地から近くまた水深が比較的浅い
ときには、ポンプ１５、コンプレツサ１６、ゼネ
レーター１７は陸上に設置しこれをホース２０に
より前記した先端装置部分に接続して、潜水夫が
これを持参し、海中で作業する方法、あるいはこ
の先端装置部分だけを第６図のように作業船１８
に取りつけ、海上から作業することもできる。 Therefore, when removing seaweed and shellfish that have grown attached to the fish reef 19 installed on the seabed, when the work place is relatively far from land, high-pressure water is used to supply high-pressure water to the nozzle support 1. pump 1
5. The air compressor 16 and generator 17 that supply compressed air may all be loaded onto a work boat, but if the water is close to land or the water is relatively shallow, the pump 15, compressor 16, and generator 17 may be installed on land. Either the tip device is connected to the above-mentioned tip device by a hose 20 and the diver brings it with him to work underwater, or the tip device is connected to the work boat 18 as shown in FIG.
It can also be attached to a ship and operated from the sea.
そこで、第６図により魚礁１９の内外面に付着
している海草等の除去作業の一例を説明すると、
まず
(a) エアモーター４付き二重スイベル３、ロツド
２、支持体１からなる先端装置部分を作業船１
８に積載し、陸地からホース２０を延長させな
がら魚礁１９位置まで移動する。 Therefore, an example of the removal work of seaweed etc. attached to the inner and outer surfaces of the fish reef 19 will be explained with reference to FIG.
First, (a) attach the tip device part consisting of the double swivel 3 with air motor 4, rod 2, and support 1 to the work boat 1.
8 and move it to the fish reef 19 position while extending the hose 20 from the land.
(b) 次に、その場所の深度に合わせて継ぎ足した
ロツド２に支持体１及びスイベル３を取りつ
け、作業船１８に設置する。(b) Next, the support body 1 and swivel 3 are attached to the rod 2 which has been added according to the depth of the location, and installed on the work boat 18.
(c) また、支持体への高圧水ホースや圧縮空気ホ
ース、エアモーターへのホース等２０を陸上の
高圧水ポンプ１５、コンプレツサ１６に接続す
る。(c) Also, connect the high-pressure water hose, compressed air hose, hose 20 to the air motor, etc. to the support body to the high-pressure water pump 15 and compressor 16 on land.
(d) そして、該ポンプ１５及びコンプレツサ１６
を始動すると共に、エアモーター４を駆動し、
支持体１を回転させながら各ノズル９からジエ
ツト水及びエアを噴出させ、ロツド２を上下に
移動させながら魚礁１９内外面に付着している
海草や貝殻等を除去するのである。(d) And the pump 15 and compressor 16
At the same time as starting the air motor 4,
Jet water and air are ejected from each nozzle 9 while rotating the support 1, and seaweed, shells, etc. adhering to the inner and outer surfaces of the fish reef 19 are removed while moving the rod 2 up and down.
なお、このように魚礁１９内外面を洗浄再生す
ると、魚が一時的に逃げてしまい、やがて帰巣す
るものではあるが、集魚効果を上げるために魚礁
１９内に固化餌料を投入するとよい。その場合、
海水中でも容易に沈降し、しかも魚が長期間食餌
できるようにするため、集魚効果のある餌の粉末
を圧力1000〜2500Kg／cm2の三軸圧で圧縮固化させ
て比重を1.8〜3.5ｇ／cm3程度にし、これを金網籠
などにいれて魚礁内に投入する。 Note that when the inner and outer surfaces of the fish reef 19 are cleaned and regenerated in this way, the fish temporarily escape and eventually return to their nests, but solidified bait may be thrown into the fish reef 19 to improve the fish-collecting effect. In that case,
In order to easily settle in seawater and allow fish to feed on it for a long period of time, powdered bait with a fish-attracting effect is compressed and solidified using triaxial pressure at a pressure of 1000 to 2500 kg/cm 2 to a specific gravity of 1.8 to 3.5 g/cm2. Reduce the size to about 3 cm, put it in a wire mesh cage, etc., and put it into the fish reef.
(ホ) 発明の効果
本発明は上述のようにしてなり、その効果を列
挙すれば、次の通りである。(e) Effects of the invention The present invention is made as described above, and its effects are listed as follows.
(1) 支持体の各ノズルにおいて、高速ジエツト水
の周りから空気噴流が噴射する構造となつてい
るので、ジエツト水の有効射程距離が著しく長
くなつて強力となり、魚礁等にとつて有害無益
な海草（スガモやホンダワラ等の雑藻や石灰藻
など）や貝殻等を効率よく除去することができ
る。(1) Each nozzle of the support is structured so that an air jet is ejected from around the high-speed jet water, so the effective range of the jet water is significantly longer and more powerful, causing no harm to fish reefs, etc. It is possible to efficiently remove seaweed (miscellaneous algae and calcareous algae such as grass duck and sargassum), shells, etc.
(2) しかも、複数のノズルを備えた支持体を水平
回転させるので、ジエツト水が経済的に利用で
き、施工能率が良い。(2) Moreover, since the support body equipped with a plurality of nozzles is horizontally rotated, jet water can be used economically and construction efficiency is high.
(3) カマやケレンのような切断・剥離法とは異な
り、流体による切断・剥離であるので、魚礁の
内外面に凹凸があつても効果的に海草や貝殻の
除去を行うことができる。(3) Unlike cutting and peeling methods such as a sickle or keren, this cutting and peeling method uses fluid, so seaweed and shells can be effectively removed even if there are irregularities on the inner and outer surfaces of the reef.
(4) 先端装置部は支持体、ロツド、スイベルなど
小型軽量でコンパクトであるので、海上からで
もまた潜水夫による海中作業でも施工でき、操
作が容易で機動性に優れている。(4) The tip device is small, lightweight, and compact, including the support, rod, and swivel, so it can be installed from the sea or by a diver under the sea, and it is easy to operate and has excellent maneuverability.
(5) 魚礁にはコンクリート製や鋼製等種々の材料
や種々の形状があるが、形状や材料には関係な
く海草等の除去を行うことができ、また本発明
に係る装置で魚礁や岩礁面から雑藻や石灰藻を
除去すると、コンブやワカメの胞子の付着性が
良好となる利点もある。(5) Fish reefs are made of various materials such as concrete and steel, and have various shapes; however, seaweed etc. can be removed regardless of the shape or material, and the device according to the present invention can be used to remove fish reefs and rocky reefs. Removing miscellaneous algae and calcareous algae from the surface also has the advantage of making it easier for kelp and wakame spores to adhere.
第１図は本発明装置の説明図、第２図は複数の
ノズルを備えた支持体の縦断面図、第３図は第２
図Ａ−Ａ断面図、第４図は上記支持体の一部拡大
縦断面図、第５図は二重スイベルとエアモーター
の一例を示す縦断面図、第６図は施工状態の一例
を示す説明図である。
符号説明、１……筒状支持体、２……二重管ロ
ツド、３……二重スイベル、４……エアモーター
等の回転駆動部、５……高圧水供給管、６……圧
縮空気供給管、７……給気管、８……排気管、９
……ノズル、１０……水通路、１１……空気通
路、１２……通水部、１３……通気部、１４……
ベアリング、１５……高圧水ポンプ、１６……コ
ンプレツサ、１７……ゼネレータ、１８……作業
船、１９……魚礁、２０……ホース、２１……フ
イン。
FIG. 1 is an explanatory diagram of the device of the present invention, FIG. 2 is a longitudinal sectional view of a support body equipped with a plurality of nozzles, and FIG.
Figure AA is a sectional view, Figure 4 is a partially enlarged vertical cross-sectional view of the support, Figure 5 is a vertical cross-sectional view showing an example of a double swivel and an air motor, and Figure 6 is an example of a construction state. It is an explanatory diagram. Explanation of symbols, 1... Cylindrical support, 2... Double pipe rod, 3... Double swivel, 4... Rotation drive unit such as air motor, 5... High pressure water supply pipe, 6... Compressed air Supply pipe, 7...Air supply pipe, 8...Exhaust pipe, 9
... Nozzle, 10 ... Water passage, 11 ... Air passage, 12 ... Water passage section, 13 ... Ventilation section, 14 ...
Bearing, 15...high pressure water pump, 16...compressor, 17...generator, 18...work boat, 19...fish reef, 20...hose, 21...fin.
Claims (1)
空気が噴出するノズルを両端及び下面に設けた筒
状支持体の中間部が内外二重管のロツド下端に取
付けられ、上記支持体内には上記ロツド内管に連
通する水通路とロツド外管に連通する空気通路が
形成されてそれぞれ上記各ノズルに連通し、上記
ロツドの上端には該ロツドに連通する二重スイベ
ルが固定され、該スイベルはその外側に設けられ
たエアモーター等の回転駆動部により回転自在に
支持されていると共に、上記ロツドの内管に圧力
水をまた外管に圧縮空気を供給する供給管が接続
されてなることを特徴とする水中構造物等の表面
再生装置。 ２ 前記第１項において、ロツド外管へ供給する
圧縮空気は前記二重スイベルへ直接供給される場
合と、前記回転駆動部としてのエアモーターに使
用した圧縮空気を利用する場合のいずれかである
水中構造物等の表面再生装置。[Scope of Claims] 1. The middle part of a cylindrical support body is provided with nozzles at both ends and on the lower surface through which jet water is ejected from the center and compressed air is ejected from the periphery thereof, and the middle part of the cylindrical support body is attached to the lower end of the rod of the inner and outer double pipe, A water passageway communicating with the inner tube of the rod and an air passageway communicating with the outer tube of the rod are formed in the body and communicate with each of the nozzles, respectively, and a double swivel communicating with the rod is fixed to the upper end of the rod. The swivel is rotatably supported by a rotary drive unit such as an air motor provided on the outside thereof, and a supply pipe is connected to supply pressurized water to the inner pipe of the rod and compressed air to the outer pipe. A surface regeneration device for underwater structures, etc., which is characterized by: 2 In the above item 1, the compressed air supplied to the rod outer tube is either directly supplied to the double swivel, or the compressed air used in the air motor as the rotational drive unit is used. Surface regeneration equipment for underwater structures, etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63210134A JPH0259085A (en) | 1988-08-24 | 1988-08-24 | Method and apparatus for surface regeneration of underwater structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63210134A JPH0259085A (en) | 1988-08-24 | 1988-08-24 | Method and apparatus for surface regeneration of underwater structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0259085A JPH0259085A (en) | 1990-02-28 |
| JPH0471595B2 true JPH0471595B2 (en) | 1992-11-16 |
Family
ID=16584349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63210134A Granted JPH0259085A (en) | 1988-08-24 | 1988-08-24 | Method and apparatus for surface regeneration of underwater structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0259085A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3015758A1 (en) * | 2013-12-23 | 2015-06-26 | Commissariat Energie Atomique | METHOD AND DEVICE FOR CLEANING AN ASSEMBLY OF NUCLEAR FUEL PENCILS |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5392562A (en) * | 1977-01-24 | 1978-08-14 | Kajima Corp | Method of and apparatus for removing matters attaching to submarine structu re |
-
1988
- 1988-08-24 JP JP63210134A patent/JPH0259085A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5392562A (en) * | 1977-01-24 | 1978-08-14 | Kajima Corp | Method of and apparatus for removing matters attaching to submarine structu re |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0259085A (en) | 1990-02-28 |
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