JPH04138008A - Method of confirming position of submarine cable - Google Patents
Method of confirming position of submarine cableInfo
- Publication number
- JPH04138008A JPH04138008A JP2258181A JP25818190A JPH04138008A JP H04138008 A JPH04138008 A JP H04138008A JP 2258181 A JP2258181 A JP 2258181A JP 25818190 A JP25818190 A JP 25818190A JP H04138008 A JPH04138008 A JP H04138008A
- Authority
- JP
- Japan
- Prior art keywords
- submarine cable
- cable
- laying
- acoustic
- ship
- 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
Links
- 238000000034 method Methods 0.000 title claims description 8
- 238000005259 measurement Methods 0.000 abstract description 5
- 238000009434 installation Methods 0.000 description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
- G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
- G02B6/506—Underwater installation
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
- Electric Cable Installation (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
この発明は海底ケーブルに関し、より詳しくは海底ケー
ブルの海底敷設位置を正確に確認する方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to submarine cables, and more particularly to a method for accurately confirming the location where a submarine cable is laid on the ocean floor.
［従来の技術］
以下、従来の海底ケーブルの布設を図面を参照して説明
する。第４図において、海底ケーブル１の着底位置ａは
布設前２の船位を測量船３により測定することにより海
底ケーブル１の敷設位置としてきた。この海底ケーブル
１の布設制御は、布設する海底ケーブル１の入水角を測
定し、ある角度（限界入水角α）以上にならないように
布設前２の速度Ｖ、および海底ケーブルｌの繰り出し速
度を変えて行うものである。布設前２の速度をｖ８．潮
流をｖｕ、海底ケーブルｌの単位当りの水中重量をＷ、
抵抗係数をＣ６，海中の密度をρ１．海底ケーブル１の
外径なｄとするとここで
の関係式が成立する。[Prior Art] Hereinafter, conventional submarine cable installation will be described with reference to drawings. In FIG. 4, the bottom landing position a of the submarine cable 1 has been determined as the laying position of the submarine cable 1 by measuring the position of the ship 2 before laying it with a survey ship 3. This submarine cable 1 installation control measures the water entry angle of the submarine cable 1 to be laid, and changes the speed V before laying 2 and the payout speed of the submarine cable 1 so that it does not exceed a certain angle (limit water entry angle α). This is done by Change the speed before installation 2 to v8. The tidal current is vu, the underwater weight per unit of submarine cable l is W,
The drag coefficient is C6, and the density of the sea is ρ1. If d is the outer diameter of the submarine cable 1, the following relational expression holds true.
限界入水角αは上記（１）、（２）式によりαを算出す
ることにより求めることができる。ところが、潮流■。The critical water entry angle α can be determined by calculating α using the above equations (1) and (2). However, the trend ■.
は時々刻々変化しており、がっ、第５図に示すように水
面と海底面４とでは潮流が一定しておらず、海底の地形
によっても異なり、正確に限界入水角αを算出すること
は極めて困難となっている。As shown in Figure 5, the current is not constant between the water surface and the seabed surface 4, and it also varies depending on the topography of the seabed, so it is difficult to accurately calculate the critical water entry angle α. has become extremely difficult.
また、特開昭６１−５３５８１号公報に記載されたもの
では、反射効率のよいコーナーリフレクタを海底ケーブ
ルに数ｍ〜数十ｍの間隔で離散的に取り付けることによ
り超音波の反射によりケーブルの海中での敷設位置を測
定し、入水角や海中でのケーブル位置を確認するもので
ある。In addition, in the method described in Japanese Patent Application Laid-open No. 61-53581, corner reflectors with high reflection efficiency are discretely attached to submarine cables at intervals of several meters to several tens of meters, so that the reflection of ultrasonic waves can cause the cables to move underwater. This is to measure the installation position at sea level and confirm the angle of entry into the water and the position of the cable in the sea.
［発明が解決しようとする課題〕
このように、水深の深い場合や潮流が大きい場合に、水
中での海底ケーブルは測定された船位よりも大きく離れ
てしまう可能性があり、最終的な海底ケーブルの着底位
置は不明確になってしまう、また、コーナーリフレクタ
で超音波の反射波を利用する方式では、反射波を測量船
側の受信装置へ受信させるため、コーナーリフレクタの
姿勢制御を行う必要があり、ケーブル敷設速度が速かっ
たり潮流が速くなるとこの姿勢制御を困難にするととも
に、場合によっては位置確認が行えなくなることも想定
される。そして、コーナーリフレクタでは、海底ケーブ
ルへの取付間隔を小さ（して多数取り付ける必要があり
、姿勢を保つためのブイが多数取り付けられることとな
って海底ケーブルへの浮力を大きくしてしまうという弊
害を伴い易かった。[Problem to be solved by the invention] As described above, when the water depth is deep or the tidal current is large, the submarine cable underwater may be far away from the measured ship position, and the final submarine cable may be In addition, in the method of using reflected waves of ultrasonic waves with a corner reflector, it is necessary to control the attitude of the corner reflector in order to receive the reflected waves to the receiver on the survey ship side. However, if the cable laying speed is high or the current is high, this attitude control will become difficult and, in some cases, it may become impossible to confirm the position. In addition, corner reflectors need to be installed in large numbers at small intervals on the submarine cable, which has the disadvantage of increasing the buoyancy force on the submarine cable by attaching many buoys to maintain the attitude. It was easy to follow.
この発明は、このような点に鑑みてなされたもので、前
述した従来技術の欠点を解消し、海底ケーブルの布設（
着底）位置を正確に捉えることができる新規な海底ケー
ブルの位置確認方法を提供することを目的とする。This invention was made in view of the above points, and it solves the drawbacks of the prior art described above and improves the laying of submarine cables (
The purpose of this research is to provide a new method for confirming the position of submarine cables that can accurately determine the position of the submarine cable (reaching the bottom).
［課題を解決するための手段および作用コこの発明は、
布設中の海底ケーブルにその長さ方向の所々に音波発信
装置を取り付け、これらの音波発信装置から発信された
音波を船位測量船に搭載された受信装置で受信し、布設
中、即ち、動いている海底ケーブルの位置を確認するた
め音波発信装置を取付けることによって、海底ケーブル
の敷設位置を確認するようにしたことを特徴とする海底
ケーブルの位置確認方法である。[Means and effects for solving the problem] This invention has the following features:
Sound wave transmitters are attached to the submarine cable being installed at various locations along its length, and the sound waves emitted from these sound wave transmitters are received by a receiver mounted on a ship position surveying vessel. This is a method for confirming the position of a submarine cable, characterized in that the installation position of the submarine cable is confirmed by installing a sound wave transmitting device in order to confirm the position of the submarine cable.
［実 施 例］
以下、図面に基づいて実施例を説明する。第１図は海底
ケーブルの布設図である。即ち、海底ケーブル１は布設
能２より海底面４に向かって送り出されて布設される。[Example] Hereinafter, an example will be described based on the drawings. Figure 1 is a diagram of the submarine cable installation. That is, the submarine cable 1 is sent out from the laying cable 2 toward the seabed surface 4 and laid.
この布設される海底ケーブル１にある間隔を置いて音波
発信器５，６゜７１．・・を取り付けておき０図では３
個のみ示す）、ケーブル布設時に音波を発信させる。音
波発信器５，６，７． ・・・から発信された音波Ｐ
１．Ｐｚ、Ｐｘは測量船３に設置されている受信装置８
により受信し、測量船３から海底ケーブルｌの着底点ａ
、海中での位置す、ｃ、 ・・・を測定し、入水角お
よび海中の海底ケーブルの位置を確認するようになって
いる。このとき、測量船３の船位（緯度、経度等）を船
位測定装置により測定すれば、海底ケーブルｌの布設位
置が海図に記入できる。Sound wave transmitters 5, 6°71. Attach ... and 3 in figure 0.
(Only shown), transmits sound waves during cable installation. Sound wave transmitters 5, 6, 7. Sound wave P transmitted from ...
1. Pz and Px are receiving devices 8 installed on the survey ship 3
from the survey ship 3 to the landing point a of the submarine cable l.
, position in the sea, c, ... to confirm the angle of entry into the water and the position of the submarine cable in the sea. At this time, if the position (latitude, longitude, etc.) of the survey ship 3 is measured by a ship position measuring device, the installation position of the submarine cable 1 can be entered on the nautical chart.
海底ケーブル１が海底面４に着底しているかどうかの確
認は、測量船３に取り付けた水深計１゜による測定値と
、海図および船位測定結果により判定する。Whether or not the submarine cable 1 has touched the bottom of the ocean floor 4 is determined based on the measurement value from a 1° depth gauge attached to the surveying boat 3, the nautical chart, and the ship position measurement results.
なお、音波発信装置５，６．７は、それぞれの発信周波
数ｐ、、ｐ、、ｐ、を変えることにより、受信側の混信
を避けるとともに、海底面４と海底ケーブル１の布設長
を確認することも可能である。In addition, the sound wave transmitters 5, 6.7 avoid interference on the receiving side by changing their respective transmission frequencies p, , p, , p, and also confirm the submarine surface 4 and the laying length of the submarine cable 1. It is also possible.
海底ケーブル１に取り付ける音波発信装置５は、第２図
に示すように音響切離器１を介して海底ケーブル１に連
結される。そして、音波発信装置５には音波発信装置５
を回収するための小型のブイ１２が取り付けられており
、測定後に上記音響切離器１１を作動させてブイ１２に
より浮上させて回収するようになっている。A sound wave transmitter 5 attached to the submarine cable 1 is connected to the submarine cable 1 via an acoustic isolator 1, as shown in FIG. The sound wave transmitter 5 includes a sound wave transmitter 5.
A small buoy 12 is attached to collect the sample, and after the measurement, the acoustic isolator 11 is activated to raise the sample to the surface and collect the sample.
従って、音波発信装置５による自己発信タイプの測定な
ので、姿勢制御を特に必要としない、また、小型、軽量
なのでブイ１２の浮力発生部は小さくでき、海底ケーブ
ル１に与える浮力の影響を無くすことが可能となる。し
かも安価であるのでこれを回収しない場合には音響切離
器１１．ブイ１２も必要としないので、浮力の影響を全
く受けることがない。そして、音波発信器の間隔は自由
に選択することができる。Therefore, since the measurement is of a self-transmission type using the sound wave transmitter 5, there is no particular need for attitude control, and since it is small and lightweight, the buoyancy generating part of the buoy 12 can be made small, and the influence of buoyancy on the submarine cable 1 can be eliminated. It becomes possible. Moreover, since it is cheap, if you do not collect it, the acoustic isolator 11. Since the buoy 12 is not required, it is not affected by buoyancy at all. The spacing between the sound wave transmitters can be freely selected.
第３図に、海底ケーブル布設状況の一例を示す、布設船
２から送り出された海底ケーブル１は、潮流等により１
′、１″のように大きく位置ずれを起すことになる。海
底４は事前に実施した海底調査により海底ケーブルｌの
布設位置に障害があるかどうか予め確認しておく、そし
て、上記のように位置ずれを起しても正確な海底ケーブ
ルｌの位置を測量船３によって測定し、海図に記入でき
る。そして、海底ケーブルｌの布設中のデータ処理によ
り、現在布設中の海底ケーブル１の状況をリアルタイム
で確認することができるので、布設作業の状況把握が可
能となる。Figure 3 shows an example of the submarine cable installation situation.The submarine cable 1 sent out from the installation ship 2 is
', 1'' will occur.As for the seabed 4, confirm in advance whether there are any obstacles in the laying position of the submarine cable l by conducting a seabed survey in advance, and as described above. Even if a positional shift occurs, the accurate position of the submarine cable 1 can be measured by the survey ship 3 and recorded on the nautical chart.Then, by processing data during the laying of the submarine cable 1, the status of the submarine cable 1 currently being laid can be determined. Since it can be checked in real time, it is possible to understand the status of the installation work.
［発明の効果］
以上説明したとおり、この発明の海底ケーブル、の位置
確認方法によれば、布設中の海底ケーブルの布設位置が
無理なく正確に確認することができるので、海図への海
底ケーブルの位置の正確な記入と、事前に実施した海底
調査結果に基づき海底ケーブルの布設位置に障害がある
かどうかの確認が可能となるほか、海底ケーブル布設中
のデータ処理により、現在の海底ケーブルがどのように
なっているかのリアルタイムで確認することができるの
で、布設状況の正確な把握が可能となる。[Effects of the Invention] As explained above, according to the submarine cable position confirmation method of the present invention, the laying position of the submarine cable that is being laid can be easily and accurately confirmed, so that it is possible to easily and accurately confirm the submarine cable location on the nautical chart. In addition to making it possible to accurately enter the location and confirm whether there is a problem at the submarine cable installation location based on the results of a seabed survey conducted in advance, data processing during submarine cable installation allows you to check the location of the current submarine cable. Since it is possible to check in real time whether the installation status is correct, it is possible to accurately grasp the installation status.
第１図は、この発明の実施例の海底ケーブルを布設して
いる状態の説明図、
第２図は、海底ケーブルに音波発信装置を取り付けた状
態を示ず側面図、
第３図は、海底ケーブル布設状況を示す斜視図、
第４図は、限界入水角を説明するための説明図、
第５図は、潮流を示す線区である。
１・・・海底ケーブル
２・・・布設船
３・・・測量船
４・・・海底面
５．６．７・・・音波発信装置
８・・・受信装置
９・・・船位測定装置
０・・・水深計
ｌ・・・音響装置切離器
２・・・ブイFig. 1 is an explanatory diagram of a state in which a submarine cable according to an embodiment of the present invention is laid; Fig. 2 is a side view without showing the state in which a sound wave transmitter is attached to the submarine cable; Figure 4 is a perspective view showing the cable installation situation, Figure 4 is an explanatory diagram to explain the critical water entry angle, and Figure 5 is a line section showing tidal currents. 1... Submarine cable 2... Laying ship 3... Survey ship 4... Seabed surface 5.6.7... Sound wave transmitting device 8... Receiving device 9... Ship position measuring device 0.・・Depth gauge 1・Sound device disconnector 2・・Buoy
Claims (1)
装置を取り付け、これらの音波発信装置から発信された
音波を船位測量船に搭載された受信装置で受信し、布設
中の海底ケーブルの位置を確認するようにして、海底ケ
ーブルの海底敷設位置を確認するようにしたことを特徴
とする海底ケーブルの位置確認方法。Sound wave transmitters are attached to the submarine cable being laid at various points along its length, and the sound waves emitted from these sound wave transmitters are received by a receiver mounted on a ship position surveying vessel to determine the position of the submarine cable being laid. A method for confirming the location of a submarine cable, characterized in that the location of the submarine cable is confirmed by confirming the location of the submarine cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2258181A JPH04138008A (en) | 1990-09-27 | 1990-09-27 | Method of confirming position of submarine cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2258181A JPH04138008A (en) | 1990-09-27 | 1990-09-27 | Method of confirming position of submarine cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04138008A true JPH04138008A (en) | 1992-05-12 |
Family
ID=17316643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2258181A Pending JPH04138008A (en) | 1990-09-27 | 1990-09-27 | Method of confirming position of submarine cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04138008A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269783A (en) * | 2014-10-22 | 2015-01-07 | 中国海洋石油总公司 | Cable pulling-back method |
| CN111351528A (en) * | 2019-12-24 | 2020-06-30 | 中国海洋大学 | Submarine boundary layer observation device and laying and recycling method thereof |
| CN114563783A (en) * | 2022-04-26 | 2022-05-31 | 苏州光格科技股份有限公司 | Submarine cable route detection system and method |
-
1990
- 1990-09-27 JP JP2258181A patent/JPH04138008A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104269783A (en) * | 2014-10-22 | 2015-01-07 | 中国海洋石油总公司 | Cable pulling-back method |
| CN111351528A (en) * | 2019-12-24 | 2020-06-30 | 中国海洋大学 | Submarine boundary layer observation device and laying and recycling method thereof |
| CN114563783A (en) * | 2022-04-26 | 2022-05-31 | 苏州光格科技股份有限公司 | Submarine cable route detection system and method |
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