JP2001025124A - Method of forced feeding of gas for cable installation - Google Patents
Method of forced feeding of gas for cable installationInfo
- Publication number
- JP2001025124A JP2001025124A JP19046099A JP19046099A JP2001025124A JP 2001025124 A JP2001025124 A JP 2001025124A JP 19046099 A JP19046099 A JP 19046099A JP 19046099 A JP19046099 A JP 19046099A JP 2001025124 A JP2001025124 A JP 2001025124A
- Authority
- JP
- Japan
- Prior art keywords
- cable
- pressure
- pressure receiving
- laying
- sheath tube
- 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
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Electric Cable Installation (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、空気や窒素ガス等
の気体の流れを利用し、鞘管内に光ファイバケーブル等
のケーブルを挿通するケーブル布設用気体圧送工法に係
り、特に長尺の鞘管内に布設ケーブルを気体圧送して挿
通するのに適したケーブル布設用気体圧送工法に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas pressure feeding method for laying a cable, in which a cable such as an optical fiber cable is inserted into a sheath tube by utilizing a gas flow such as air or nitrogen gas, and particularly to a long sheath. The present invention relates to a gas laying method for laying a cable, which is suitable for gas laying and inserting a laying cable into a pipe.
【０００２】[0002]
【従来の技術】一般に通信ケーブル等を地下に埋設する
場合、外圧や水等から保護するために、鋼製又はポリエ
チレン製等の鞘管内に布設している。この鞘管内にケー
ブルを布設する工法として、鞘管内に布設ケーブルを気
体圧送して挿通する気体圧送工法が広く用いられてい
る。その代表的なものは、高圧空気を用いて布設ケーブ
ルを挿通する空気圧送工法である。2. Description of the Related Art Generally, when a communication cable or the like is buried underground, it is laid in a sheath tube made of steel or polyethylene to protect it from external pressure, water, and the like. As a method of laying a cable in the sheath tube, a gas pressure method in which the cable is gas-fed and inserted into the sheath tube is widely used. A typical example is a pneumatic feeding method in which a laid cable is inserted using high-pressure air.
【０００３】従来の空気圧送工法を図２及び図３により
説明する。A conventional pneumatic feeding method will be described with reference to FIGS.
【０００４】空気圧送工法では、図２に示すように、ケ
ーブル布設用の鞘管２に圧送ヘッド１０を接続し、この
ヘッド内のチャンバ１３に送り込み把持手段である駆動
ホイール１１から光ファイバケーブル等の布設ケーブル
１を送り込むと共に、高圧空気を供給口１２から送り込
むことにより、布設ケーブル１を鞘管２内に圧送する。
なお圧送ヘッド１０は、布設ケーブル１との間に接触式
シール部１４を有している。In the pneumatic feeding method, as shown in FIG. 2, a pressure feeding head 10 is connected to a sheath pipe 2 for laying a cable, and is fed into a chamber 13 in the head and a driving wheel 11 serving as a gripping means and an optical fiber cable or the like. And the high-pressure air is fed from the supply port 12 to pressure feed the cable 1 into the sheath tube 2.
The pressure feed head 10 has a contact-type seal portion 14 between the pressure feed head 10 and the laid cable 1.
【０００５】一方、図３に示すように、布設ケーブル１
の先端には引き込み力を大きくするため、布設ケーブル
１より断面の大きい１つの受圧板３から成る受圧ヘッド
５が取り付けられる。On the other hand, as shown in FIG.
A pressure receiving head 5 composed of one pressure receiving plate 3 having a larger cross section than the laid cable 1 is attached to the tip of the cable.
【０００６】ケーブルの布設距離が比較的短いときは、
左方にある図２の圧送装置に搭載されている送り込み把
持手段である駆動ホイール１１により、布設ケーブル１
は推進力を与えられ、鞘管２内を左から右へ前進する。
布設距離が長くなると、布設ケーブル１と鞘管２内面と
の摩擦力が大きくなり、駆動ホイール１１による押込力
だけではケーブルは前進できず、停止することになる。
そこで布設距離が長くなると、前記圧送装置内の高圧空
気シール用圧送ヘッド１０を介して、鞘管２内にコンプ
レッサ（図示せず）から高圧空気を供給し、図１の左か
ら右への空気の高速な流れにより布設ケーブル１を浮か
せ、鞘管２との摩擦抵抗を減少させると共に、布設ケー
ブル１と空気との摩擦力を介して、布設ケーブル１に推
進力を生じさせる。さらに布設ケーブル１の先端に取付
けた受圧板３が高圧空気に押されて推進力を生じ、布設
ケーブル１を引張る作用をなす。この受圧板３により生
ずる推進力の大きさは、受圧板３の受圧面積に比例し、
受圧面積が大きい程ケーブルを引張る推進力も大きくな
る。When the cable laying distance is relatively short,
The laying cable 1 is driven by a drive wheel 11 which is a feed gripping means mounted on the left side of the pumping device of FIG.
Is given a propulsive force and moves forward in the sheath tube 2 from left to right.
When the laying distance is long, the frictional force between the laying cable 1 and the inner surface of the sheath tube 2 increases, and the cable cannot move forward only by the pushing force by the drive wheel 11 and stops.
Therefore, when the laying distance becomes long, high-pressure air is supplied from a compressor (not shown) into the sheath tube 2 via the high-pressure air sealing pressure-feeding head 10 in the pressure-feeding device, and air from left to right in FIG. The floating cable 1 is floated by the high-speed flow, the frictional resistance with the sheath tube 2 is reduced, and a propulsive force is generated in the cable 1 via the frictional force between the cable 1 and the air. Further, the pressure receiving plate 3 attached to the distal end of the laid cable 1 is pushed by the high-pressure air to generate a propulsion force, and acts to pull the laid cable 1. The magnitude of the thrust generated by the pressure receiving plate 3 is proportional to the pressure receiving area of the pressure receiving plate 3,
The greater the pressure receiving area, the greater the propulsive force to pull the cable.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、例えば
光ファイバケーブルの場合、圧送途中で鞘管内面と光フ
ァイバケーブルとの間に生じた摩擦力（特に鞘管に曲が
りルートが多い場合にはこれが大きい）等のため、鞘管
長が長くなると布設できなくなるという問題があった。
１０００ｍ程度の通常の鞘管ルートであれば、光ファイ
バケーブルは容易に圧送できるが、複雑な曲がりが沢山
あったり１０００ｍ以上の長尺になると鞘管途中で光フ
ァイバケーブルは圧送不可能となってしまう。However, for example, in the case of an optical fiber cable, the frictional force generated between the inner surface of the sheath tube and the optical fiber cable during the pressure feeding (particularly when the sheath tube has many bending routes, this is large). ) And the like, there is a problem that the sheath cannot be laid when the length of the sheath tube is long.
If it is a normal sheath pipe route of about 1000 m, the optical fiber cable can be easily pumped, but if there are many complicated bends or if it is longer than 1000 m, the optical fiber cable cannot be pumped in the middle of the sheath pipe. I will.
【０００８】特に、長尺ケーブルを布設する場合、当然
ながらケーブル重量は増大し摩擦抵抗も大きくなる。こ
のため、一面から考えると、できるだけ受圧板の受圧面
積を大きくしケーブルを引張る推進力を大きくした方が
有利である。しかし、他面においては、受圧板を大きく
し過ぎるとケーブルの挿通が困難になり易いという問題
がある。すなわち、実際の管路ルートは直線ではなく様
々な曲率のカーブやハンドホール部（又はマンホール
部）での段差等が存在し、特に曲率の小さい曲り部分で
大きな受圧板が抵抗となり極端な場合ケーブルの通過が
困難となる危険性が生ずる。In particular, when a long cable is laid, the cable weight naturally increases and the frictional resistance also increases. For this reason, from the viewpoint of one aspect, it is advantageous to increase the pressure receiving area of the pressure receiving plate as much as possible to increase the propulsive force for pulling the cable. However, on the other side, there is a problem that if the pressure receiving plate is too large, it becomes difficult to insert the cable. In other words, the actual pipeline route is not straight, but has curves of various curvatures and steps at the handhole (or manhole). Especially in a curved portion having a small curvature, a large pressure receiving plate becomes a resistance, and in an extreme case, a cable is There is a risk that it will be difficult to pass through.
【０００９】このため受圧板の大きさは小さくて、なお
かつ大きな推進力を発生する受圧ヘッドの開発が望まれ
ていた。Therefore, it has been desired to develop a pressure receiving head which has a small pressure receiving plate and generates a large propulsive force.
【００１０】そこで本発明の目的は、上記課題を解決
し、布設するケーブルの先端に取付ける受圧板の大きさ
を小さくし、その発生する推進力を大きくした受圧ヘッ
ドを用いることによって、小さい曲率や段差のある管路
ルートにおける長尺ケーブルの布設を可能にした気体圧
送工法を提供することにある。Accordingly, an object of the present invention is to solve the above-mentioned problems, to reduce the size of a pressure receiving plate attached to the end of a cable to be laid, and to use a pressure receiving head having a large propulsive force to reduce a curvature and a small curvature. It is an object of the present invention to provide a gas pressure feeding method which enables a long cable to be laid in a pipeline route having a step.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、鞘管内に布設ケーブルを気体圧送して挿
通するケーブル布設用気体圧送工法において、前記ケー
ブルの先端に受圧ヘッドを設け、この受圧ヘッドとして
鞘管内に挿通が容易な大きさの受圧板を長手方向に多段
に配設した構成のものを用いるようにしたものである
（請求項１）。In order to achieve the above-mentioned object, the present invention provides a gas laying method for laying a cable in which a laying cable is gas-fed into a sheath tube and inserted therethrough, wherein a pressure-receiving head is provided at a tip end of the cable. As the pressure receiving head, a pressure receiving plate having a configuration in which pressure receiving plates of a size that can be easily inserted into the sheath tube are arranged in multiple stages in the longitudinal direction is used (claim 1).
【００１２】これは、布設するケーブルの先端に取付け
る受圧板を、従来の１枚から２枚以上多段に取り付けた
構成の受圧ヘッドに置き換えたもので、個々の受圧板を
小さくし、その発生する推進力は小さくても、複数枚の
受圧板が発生するトータルとしての推進力を大きくした
ものである。In this method, the pressure receiving plate attached to the tip of the cable to be laid is replaced with a conventional pressure receiving head having a structure in which one or more sheets are attached in two or more stages. Although the thrust is small, the total thrust generated by a plurality of pressure receiving plates is increased.
【００１３】前記受圧ヘッドとしては、例えば、鞘管内
に挿通が容易な大きさの受圧板をしなやかな弾力性のあ
るロッド上に長手方向に多段に配設した構成のものを用
いるとよい（請求項２）。As the pressure receiving head, for example, it is preferable to use a pressure receiving plate having a configuration in which a pressure receiving plate having a size that can be easily inserted into a sheath tube is disposed on a flexible and elastic rod in multiple stages in the longitudinal direction. Item 2).
【００１４】[0014]
【発明の実施の形態】以下、本発明の実施形態を、高圧
空気を用いたケーブル布設用空気圧送工法を例にして、
図面を参照しながら説明する。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an embodiment of the present invention will be described with an example of an air pressure feeding method for cable laying using high pressure air.
This will be described with reference to the drawings.
【００１５】まず、前提とする圧送装置は、図２で説明
したようにケーブル布設用の鞘管２に圧送ヘッド１０を
接続し、このヘッド内のチャンバ１３に送り込み把持手
段から光ファイバケーブル等の布設ケーブル１を送り込
むと共に、高圧空気を供給口１２から送り込むことによ
り布設ケーブル１を鞘管内に圧送する。ただし、ここで
は送り込み把持手段として駆動ホイール１１の代わりに
一対のキャタピラが用いられている。なお、圧送ヘッド
１０は、布設ケーブル１との間に接触式シール部１４を
有している。First, as shown in FIG. 2, the presumptive feeder connects the pumping head 10 to the sheath tube 2 for laying the cable, sends the pumping head 10 into the chamber 13 in the head, and feeds the optical fiber cable or the like from the holding means. The laying cable 1 is fed into the sheath pipe by feeding the laying cable 1 and high-pressure air from the supply port 12. However, here, a pair of tracks is used instead of the drive wheel 11 as the feeding gripping means. The pressure feed head 10 has a contact-type seal portion 14 between the pressure feed head 10 and the laid cable 1.
【００１６】次に、空気圧送工法について図１を用いて
説明する。Next, the pneumatic feeding method will be described with reference to FIG.
【００１７】図１は鞘管２の側面を一部切り欠いて鞘管
内部の構成を示した図である。布設ケーブル１の先端に
は、受圧ヘッド５が設けられている。この受圧ヘッド５
には鞘管２内に挿通が容易な大きさの受圧板３を、しな
やかな弾力性のあるロッド４上に長手方向に多段に配設
した構成のものが用いられている。ここでは、ＦＲＰ
（繊維強化樹脂）から成るロッド４にほぼ等間隔で４つ
の受圧板３を配設した場合を示しているが、これに限定
されるものではなく２以上の受圧板３を任意の間隔で配
設することができる。FIG. 1 is a view showing a configuration of the inside of the sheath tube 2 by partially cutting out a side surface of the sheath tube 2. A pressure receiving head 5 is provided at the tip of the laid cable 1. This pressure receiving head 5
A pressure receiving plate 3 having a size that can be easily inserted into the sheath tube 2 is provided on a flexible and elastic rod 4 in multiple stages in the longitudinal direction. Here, FRP
Although a case is shown in which four pressure receiving plates 3 are arranged at substantially equal intervals on a rod 4 made of (fiber reinforced resin), the present invention is not limited to this, and two or more pressure receiving plates 3 are arranged at arbitrary intervals. Can be set up.
【００１８】布設ケーブル１は、左方にあるキャタピラ
（図示せず）により推進力を与えられ、鞘管２内を左か
ら右へ前進する。同時にコンプレッサ（図示せず）から
高圧空気を供給し、シール機能付圧送ヘッド１０を介し
て鞘管２内に左から右へ高速な空気流を発生させる。こ
の空気流により布設ケーブル１を鞘管内表面より浮か
せ、布設ケーブル１と鞘管２との摩擦力を軽減させると
同時に、布設ケーブル１と空気との摩擦力を介して、布
設ケーブル１に推進力を生じさせる。さらに布設ケーブ
ル１の先端に取付けた受圧板３が高圧空気に押されて推
進力を生じ、布設ケーブル１を前進させる作用をなす。
以上の作用の総合的な結果として布設ケーブル１は鞘管
２を前進することとなる。The laid cable 1 is propelled by a caterpillar (not shown) located on the left side, and advances in the sheath tube 2 from left to right. At the same time, high-pressure air is supplied from a compressor (not shown), and a high-speed air flow is generated from left to right in the sheath tube 2 via the pressure-feeding head 10 with a sealing function. The air flow causes the laid cable 1 to float above the inner surface of the sheath tube, thereby reducing the frictional force between the laid cable 1 and the sheath tube 2 and, at the same time, propelling force on the laid cable 1 via the frictional force between the laid cable 1 and air. Cause. Further, the pressure receiving plate 3 attached to the tip of the laid cable 1 is pushed by the high-pressure air to generate a propulsive force, and has an action of moving the laid cable 1 forward.
As a result of the above operation, the installation cable 1 advances the sheath tube 2.
【００１９】長尺ケーブルの布設では、ケーブル重量が
増大し摩擦抵抗も大きくなるため、推進力を大きくしな
いと布設ケーブル１は前進できなくなる。この対策の１
つとして該受圧板３を大きくし、推進力を大きくするこ
とが考えられるが、管路ルートに小さな曲率や段差があ
ると、この大きな受圧板３が抵抗となり、極端な場合通
過困難となる恐れもある。When laying a long cable, the weight of the cable increases and the frictional resistance increases. Therefore, the laying cable 1 cannot move forward unless the propulsive force is increased. One of the measures
First, it is conceivable to increase the pressure receiving plate 3 to increase the propulsive force. However, if there is a small curvature or a step in the pipeline route, the large pressure receiving plate 3 becomes a resistance, and in an extreme case, it may be difficult to pass. There is also.
【００２０】しかし、本発明では図１に示したように、
鞘管２内に容易に挿通し得る大きさを持つ小さな受圧板
３を複数個（本実施形態の例では４個）多段にロッド４
に配列して構成した受圧ヘッド５を布設ケーブル１の先
端に取り付けて、受圧ヘッド全体としての受圧面積を増
加させている。また、ロッド４はしなやかな弾力性のあ
るＦＲＰ製であるため、小さな曲率や段差のある鞘管部
分であっても、受圧ヘッド５を大きな抵抗なくルートに
追従して変形させ通過させることができる。その一方、
個々の受圧板３は小さいが多段に配設されているため、
受圧板３の総和としての受圧面積は大きくなり、大きな
推進力が得られ、長尺ケーブルの布設を可能としてい
る。However, in the present invention, as shown in FIG.
A plurality of (four in the example of this embodiment) small pressure receiving plates 3 having a size that can be easily inserted into the sheath tube 2
The pressure receiving head 5 is arranged at the tip of the laid cable 1 to increase the pressure receiving area of the pressure receiving head as a whole. Further, since the rod 4 is made of flexible and flexible FRP, the pressure receiving head 5 can be deformed and passed along the route without a large resistance even in a sheath tube portion having a small curvature or a step. . On the other hand,
Since the individual pressure receiving plates 3 are small but arranged in multiple stages,
The pressure receiving area as the sum of the pressure receiving plates 3 is increased, a large propulsion force is obtained, and a long cable can be laid.
【００２１】なお、小さな受圧板の大きさの目安として
は、ケーブルの布設作業に先立ち鞘管内径の８割の直径
の球による玉通し試験を実施し、通過を確認することが
通例となっているので、受圧板の大きさも鞘管内径の８
割以下にしておけば、確実に管路ルートを通過できると
考えられる。As a guide for the size of the small pressure receiving plate, it is customary to carry out a ball-through test with a ball having a diameter of 80% of the inner diameter of the sheath tube before the cable laying operation to confirm the passage. The size of the pressure receiving plate is
If it is set below a certain level, it can be considered that it will be possible to pass through the pipeline route without fail.
【００２２】[0022]
【発明の効果】以上説明したように、従来のケーブル布
設用気体圧送工法では、長尺ケーブル布設用の推進力を
大きくするために布設ケーブル先端に取付ける受圧板を
大きくしていたが、この方法では小さな曲率や段差部等
の通過が困難であった。As described above, in the conventional gas pressure feeding method for laying a cable, the pressure receiving plate attached to the tip of the laid cable is enlarged in order to increase the propulsive force for laying a long cable. In this case, it was difficult to pass through a small curvature or a step.
【００２３】しかし、本発明ケーブル布設用気体圧送工
法によれば、ケーブルの先端に設ける受圧ヘッドを、従
来の１枚の受圧板から成る受圧ヘッドから、鞘管内に挿
通が容易な大きさの受圧板を長手方向に２枚以上多段に
配設した構成の受圧ヘッドに置き換えているので、これ
までの受圧板よりも小さな受圧板を用いた受圧ヘッドで
ありながら、複数枚の受圧板が発生するトータルとして
の受圧ヘッドの推進力は、１枚の大きな受圧板を設けた
場合と同等か、それよりも大きな推進力となる。従っ
て、受圧ヘッドの発生する推進力を大きく維持しなが
ら、小さな曲率や段差部等の管路部分を円滑に通過させ
ることが可能であり、気体圧送による長尺ケーブルの布
設を実現することができる。However, according to the gas pressure feeding method for laying a cable of the present invention, the pressure receiving head provided at the end of the cable can be easily inserted into the sheath tube from the conventional pressure receiving head comprising a single pressure receiving plate. Since the pressure receiving head has a structure in which two or more plates are arranged in multiple stages in the longitudinal direction, a plurality of pressure receiving plates are generated even though the pressure receiving head uses a pressure receiving plate smaller than the conventional pressure receiving plate. The total thrust of the pressure receiving head is equal to or greater than the case where one large pressure receiving plate is provided. Therefore, it is possible to smoothly pass through a pipe portion such as a small curvature or a step portion while maintaining a large propulsive force generated by the pressure receiving head, and it is possible to lay a long cable by gas pressure feeding. .
【図１】本発明のケーブル布設用気体圧送工法における
鞘管の側面を一部切り欠いて示した断面図である。FIG. 1 is a cross-sectional view of a sheath pipe in a gas pressure feeding method for laying a cable according to the present invention, in which a side surface of a sheath tube is partially cut away.
【図２】従来の空気圧送装置を示した概念図である。FIG. 2 is a conceptual diagram showing a conventional pneumatic feeding device.
【図３】従来のケーブル布設用空気圧送工法における鞘
管の側面を一部切り欠いて示した断面図である。FIG. 3 is a cross-sectional view of a sheath tube in a conventional pneumatic cable laying method for cable laying, in which a side surface of the sheath tube is partially cut away.
【符号の説明】 １ 布設ケーブル ２ 鞘管 ３ 受圧板 ４ ロッド ５ 受圧ヘッド[Description of Signs] 1 Installation cable 2 Sheath tube 3 Pressure receiving plate 4 Rod 5 Pressure receiving head
───────────────────────────────────────────────────── フロントページの続き (72)発明者 笹崎 元樹 茨城県日立市砂沢町880番地 日立電線株 式会社高砂工場内 (72)発明者 熊谷 匡敏 茨城県日立市日高町５丁目９番15号 日立 電線エンジニアリング株式会社内 Ｆターム(参考） 2H038 CA69 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Motoki Sasazaki 880 Sunasawa-cho, Hitachi City, Ibaraki Prefecture Inside the Takasago Plant of Hitachi Cable Co., Ltd. (72) Inventor Masatoshi Kumagai 5-9-1 Hidakacho, Hitachi City, Ibaraki Prefecture No.15 F-term in Hitachi Cable Engineering Co., Ltd. (reference) 2H038 CA69
Claims (2)
するケーブル布設用気体圧送工法において、前記ケーブ
ルの先端に受圧ヘッドを設け、この受圧ヘッドとして鞘
管内に挿通が容易な大きさの受圧板を長手方向に多段に
配設した構成のものを用いることを特徴とするケーブル
布設用気体圧送工法。In a gas laying method for laying a cable, which lays a cable laid in a sheath tube by gas pressure, a pressure receiving head is provided at a distal end of the cable, and the pressure receiving head has a size easily inserted into the sheath tube as the pressure receiving head. A gas pressure construction method for laying cables, characterized by using a structure in which plates are arranged in multiple stages in the longitudinal direction.
易な大きさの受圧板をしなやかな弾力性のあるロッド上
に長手方向に多段に配設した構成のものを用いることを
特徴とする請求項１記載のケーブル布設用気体圧送工
法。2. The pressure receiving head according to claim 1, wherein a pressure receiving plate having a size easily inserted into the sheath tube is provided on a flexible and elastic rod in multiple stages in a longitudinal direction. The gas pressure method for laying a cable according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19046099A JP2001025124A (en) | 1999-07-05 | 1999-07-05 | Method of forced feeding of gas for cable installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19046099A JP2001025124A (en) | 1999-07-05 | 1999-07-05 | Method of forced feeding of gas for cable installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001025124A true JP2001025124A (en) | 2001-01-26 |
Family
ID=16258494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19046099A Pending JP2001025124A (en) | 1999-07-05 | 1999-07-05 | Method of forced feeding of gas for cable installation |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001025124A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100904609B1 (en) | 2007-09-27 | 2009-06-25 | 주식회사 케이티 | Device and method for pulling traction line using air - blowing techniques in inner pipe deploied optical fibre |
-
1999
- 1999-07-05 JP JP19046099A patent/JP2001025124A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100904609B1 (en) | 2007-09-27 | 2009-06-25 | 주식회사 케이티 | Device and method for pulling traction line using air - blowing techniques in inner pipe deploied optical fibre |
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