JPH08223731A - Push-in method of wire drawing rod into cable duct - Google Patents

Push-in method of wire drawing rod into cable duct

Info

Publication number
JPH08223731A
JPH08223731A JP4779795A JP4779795A JPH08223731A JP H08223731 A JPH08223731 A JP H08223731A JP 4779795 A JP4779795 A JP 4779795A JP 4779795 A JP4779795 A JP 4779795A JP H08223731 A JPH08223731 A JP H08223731A
Authority
JP
Japan
Prior art keywords
wire rod
rod
wire drawing
drawing rod
conduit
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
Application number
JP4779795A
Other languages
Japanese (ja)
Inventor
Yoshiaki Hachiman
義章 八幡
Sadaji Suzuki
貞二 鈴木
Akihiro Shimizu
昭博 清水
Kiyoshi Takatsuka
潔 高塚
Toru Wada
亨 和田
Masaya Kurabe
昌也 倉部
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fujikura Ltd
Original Assignee
Fujikura Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Fujikura Ltd filed Critical Fujikura Ltd
Priority to JP4779795A priority Critical patent/JPH08223731A/en
Publication of JPH08223731A publication Critical patent/JPH08223731A/en
Pending legal-status Critical Current

Links

Landscapes

  • Electric Cable Installation (AREA)

Abstract

PURPOSE: To obtain a push-in method in which a wire drawing rod does not creep into a narrow gap inside a duct and in which a wire is passed easily by a method wherein, while swelled bodies are being attached to the outer circumference of the wire drawing rod at intervals in the length direction of the rod, the wire drawing rod is pushed into an existing duct. CONSTITUTION: While corrugated rigid polyethylene tubes 11 are being put on the outer circumference of a wire drawing rod 3 at constant intervals, a push-in operation is performed. For example, the wire drawing rod 3 is made of an FRP of 10 to 14mm in diameter, and the corrugated rigid polyethylene tubes 11 have a diameter of about 28mm and a length of about 10m so as to be put on at an interval of about 10m. In addition, slits are formed over the whole length in the length direction, the slits are opened whenever the wire drawing rod 3 is pushed into by about 10m, and the polyethylene tubes are put on the outer circumference of the wire passage rod 3. Vinyl tapes are wound on both ends of every polyethylene tube so as to be fixed to the wire drawing rod 3. Thereby, it is possible to prevent the wire drawing rod form creeping into a narrow gap between a duct 1 and laid cables 2, and the wire drawing rod can be inserted and passed easily.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】この発明は,例えばケーブル既設
管路内に光ファイバ収納用のサブダクトを引き入れる際
に行う通線ロッドの押し込み作業等のように,ケーブル
既設管路内に通線ロッドを押し込む方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conduit rod installed in an existing cable conduit, such as a push-in operation of the conduit rod carried out when a sub-duct for storing an optical fiber is drawn into the existing conduit conduit. Regarding how to push.

【0002】[0002]

【従来の技術】図5は一般的な通線ロッドの押し込み作
業を説明するもので,1はケーブル用の管路,2は管路
1内に既に布設されているケーブル(既設ケーブル),
3は通線ロッドである。通線ロッド3は一般にFRP
(強化プラスチック)製であり,先端に先端誘導治具4
を取り付けて用いる。5は通線ロッド3を巻き付けてい
るロッドリール,6は光ファイバ収納用のサブダクト,
7はサブダクト6を巻き付けているサブダクトリールで
ある。前記サブダクト6をケーブル既設管路1内に布設
する場合,一方のマンホール8a側に配置したロッドリ
ール5より通線ロッド3を手動でケーブル既設管路1内
に押し込み,他方のマンホール8bに到達した後,サブ
ダクト6を連結し,次いで通線ロッド3を前記一方のマ
ンホール8a側まで引き戻して,サブダクト6を既設ケ
ーブル1内に布設する。上記のサブダクト布設作業等に
おける従来の通線ロッド押し込み方法は,単に通線ロッ
ド3をケーブル既設管路内にそのまま押し込むものであ
った。
2. Description of the Related Art FIG. 5 illustrates a general pushing operation of a wire rod. 1 is a conduit for a cable, 2 is a cable already installed in the conduit 1 (existing cable),
Reference numeral 3 is a wire rod. The wire rod 3 is generally FRP
It is made of (reinforced plastic) and has a tip guide jig 4 at the tip.
Attach and use. 5 is a rod reel around which the wire rod 3 is wound, 6 is a sub-duct for storing the optical fiber,
7 is a sub-duct reel around which the sub-duct 6 is wound. When the sub-duct 6 is laid in the existing cable conduit 1, the wire rod 3 is manually pushed into the existing cable conduit 1 from the rod reel 5 arranged on one manhole 8a side to reach the other manhole 8b. After that, the sub-duct 6 is connected, and then the wire rod 3 is pulled back to the one manhole 8a side to lay the sub-duct 6 in the existing cable 1. In the conventional method of pushing the wire rod in the above-mentioned sub-duct laying work, etc., the wire rod 3 is simply pushed into the existing conduit of the cable as it is.

【0003】[0003]

【発明が解決しようとする課題】市販されている通常の
通線ロッド3の径は10〜14mmφであり細いので,
作業者が通線ロッド3を手で持ってケーブル既設管路1
内に押し込む際,図6にケーブル既設管路1の断面を示
すように,通線ロッド3が既設ケーブル2と管路1との
隙間に入り込み,さらに通線ロッド3を押し込むと通線
ロッド3がその隙間に緊密に食い込んで摩擦抵抗が著し
く増大し,ついには動かなくなり押し込むことも引き戻
すことも不可能になってしまうという問題があった。本
発明は上記従来の欠点を解決するためになされたもの
で,通線ロッドが管路と既設ケーブルとの間の狭い隙間
に入り込んで押し込みや引き戻しが不可能になってしま
うことのない通線ロッド押し込み方法を提供することを
目的とする。
Since the diameter of the commercially available ordinary wire rod 3 is 10 to 14 mmφ and is thin,
The operator holds the wire rod 3 by hand and the existing cable conduit 1
When being pushed in, as shown in the cross section of the existing cable conduit 1 in FIG. 6, the conduit rod 3 enters the gap between the existing cable 2 and the conduit 1, and when the conduit rod 3 is further pushed in, the conduit rod 3 However, there was a problem that it bites into the gap tightly and the frictional resistance increases remarkably, and eventually it becomes impossible to push and pull back. The present invention has been made in order to solve the above-mentioned conventional drawbacks, and a wire passing rod does not enter a narrow gap between a conduit and an existing cable to prevent pushing or pulling back. An object is to provide a rod pushing method.

【0004】[0004]

【課題を解決するための手段】上記課題を可決する本発
明のケーブル既設管路内への通線ロッドの押し込み方法
は,ケーブル既設管路内に通線ロッドを押し込むに際し
て,通線ロッドの外周にロッド長手方向に間隔をあけて
膨出体を取り付けつつ通線ロッドを押し込むことを特徴
とする。
Means for Solving the Problems The method of pushing a wire rod into an existing cable conduit according to the present invention for solving the above-mentioned problems is such that when the wire rod is pushed into the existing cable conduit, the outer periphery of the wire rod is pushed. It is characterized in that the wire rod is pushed in while mounting the bulging body at intervals in the longitudinal direction of the rod.

【0005】請求項2は,前記膨出体として通線ロッド
の外周に波付硬質ポリエチレン管を被せたことを特徴と
する。
According to a second aspect of the present invention, the corrugated hard polyethylene pipe is covered on the outer periphery of the wire rod as the bulging member.

【0006】[0006]

【作用】上記構成において,通線ロッドがケーブル既設
管路に押し込まれる際,通線ロッドの少なくとも膨出体
が存在する部分では,その膨出体の外径が大きいので,
通線ロッドが管路と既設ケーブルとの間の狭い隙間に入
り込むことはない。そして,通線ロッドの適宜の長さ毎
に隙間への入り込みを防止できれば,通線ロッドが露出
している部分についても隙間への入り込みを防止でき
る。また,膨出体は通線ロッドに間隔をあけて取り付け
るので,通線ロッドが露出している部分を直接手で掴む
ことができ,押し込み作業に支障とならない。
In the above structure, when the wire rod is pushed into the existing pipe line of the cable, the outer diameter of the wire bulge is large at least in the portion where the wire bulge is present.
The wire rod does not enter the narrow gap between the conduit and the existing cable. If it is possible to prevent the wire rod from entering the gap for every appropriate length, it is possible to prevent the exposed portion of the wire rod from entering the gap. Further, since the bulging body is attached to the wire rod with a space, the exposed portion of the wire rod can be directly grasped by the hand, which does not hinder the pushing operation.

【0007】請求項2において,波付硬質ポリエチレン
管は,波付形状であり周囲との接触面積が小さいので,
摩擦抵抗が少ない。また,硬質ポリエチレンは材質的に
摩擦が低い。したがって,通線ロッドの押し込みの抵抗
を低くできる。また,波付硬質ポリエチレン管は可撓性
を持ち,かつ外径が大きくても軽量なので,押し込み作
業は容易であり,膨出体として適切である。
In claim 2, since the corrugated rigid polyethylene pipe has a corrugated shape and a small contact area with the surroundings,
Low frictional resistance. In addition, hard polyethylene has low friction in terms of material. Therefore, the resistance of pushing the wire rod can be reduced. In addition, the corrugated rigid polyethylene pipe is flexible and lightweight even if it has a large outer diameter, so it is easy to push in and is suitable as a bulge.

【0008】[0008]

【実施例】以下,本発明の実施例を図1〜図5を参照し
て説明する。図5における一方のマンホール8a側のロ
ッドリール5から通線ロッド3を手で繰り出してケーブ
ル既設管路1内に押し込む際,図1に示すように,通線
ロッド3の外周に波付硬質ポリエチレン管11を一定間
隔毎に被せながら押し込み作業を行う。図示例では,管
路1の径は130mmφである。また,ケーブル2は3
25mm2 の塩化ビニル被覆電線であり3本収容してい
る。また,通線ロッド3は直径10〜14mmφのFR
P製である。また,波付硬質ポリエチレン管11は直径
が約28mmφ,長さが約10mであり,この波付硬質
ポリエチレン管11を約10mの間隔をあけて被せてい
る。この波付硬質ポリエチレン管11は,図2に示すよ
うに,長手方向全長にわたってスリット11aを入れて
おり,通線ロッド3を10m押し込む毎に片側を開いた
波付硬質ポリエチレン管11を通線ロッド3の外周から
被せることができる。そして,被せた波付硬質ポリエチ
レン管11の両端近傍に例えばビニールテープを巻き付
けて,波付硬質ポリエチレン管11を通線ロッド3に固
定する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. When the wire rod 3 is manually unwound from the rod reel 5 on the one manhole 8a side in FIG. 5 and pushed into the existing cable conduit 1, as shown in FIG. The pushing operation is performed while covering the pipe 11 at regular intervals. In the illustrated example, the diameter of the conduit 1 is 130 mmφ. Also, the cable 2 is 3
It is a vinyl chloride-coated electric wire of 25 mm 2 and contains 3 wires. The wire rod 3 is a FR with a diameter of 10 to 14 mm.
It is made of P. The corrugated rigid polyethylene pipe 11 has a diameter of about 28 mmφ and a length of about 10 m, and the corrugated rigid polyethylene pipe 11 is covered at intervals of about 10 m. As shown in FIG. 2, the corrugated rigid polyethylene pipe 11 has slits 11a extending along the entire length in the longitudinal direction, and the corrugated rigid polyethylene pipe 11 is opened on one side every time the conduit rod 3 is pushed 10 m. 3 can be covered from the outer circumference. Then, for example, vinyl tape is wrapped around both ends of the covered corrugated hard polyethylene pipe 11 to fix the corrugated hard polyethylene pipe 11 to the wire rod 3.

【0009】上記のように波付硬質ポリエチレン管11
を被せながら通線ロッド3の押し込み作業を行うと,図
3に示すように,径の大きな波付硬質ポリエチレン管1
1は既設ケーブル2の上に乗り,管路1と既設ケーブル
2との間の狭い隙間(矢印(イ)の部分)に入り込むこ
とはない。したがって,通線ロッド3が隙間矢印(イ)
の部分に入り込むことは防止でき,通線ロッド3が動か
なくなることは防止できる。なお,波付硬質ポリエチレ
ン管11を被せないで押し込みを行った場合には,約1
30mの通線後に2人の人力でも通線ロッド3の引き戻
しができなかったのに対して,波付硬質ポリエチレン管
11を上述のように被せて押し込みを行った場合は,1
80mの通線後に1人の人力でも通線ロッド3の引き戻
しを行うことができた。波付硬質ポリエチレン管11は
通線ロッド3の全長にわたって分布させる必要はなく,
図1に示す通り,例えば先端側の約50m程度の部分に
被せるだけでも有効である。なお,波付硬質ポリエチレ
ン管11の部分を手で持って押し込むと,波付硬質ポリ
エチレン管11が容易に変形して押し込み力が通線ロッ
ド3に伝わらないので,上記のように波付硬質ポリエチ
レン管11は全長にわたって被せるのでなく,間隔をあ
けて被せ,押し込む作業は通線ロッド3の露出している
部分を手で持って行う。また,波付硬質ポリエチレン管
11は間隔をあけて取り付けられるので,波付硬質ポリ
エチレン管11を取り付けたことに伴って通線ロッド3
全体の曲げ剛性が無用に高くなることはなく,押し込み
作業がしにくくなることはない。
As described above, the corrugated rigid polyethylene pipe 11
When the wire rod 3 is pushed in while covering it, as shown in FIG. 3, the corrugated hard polyethylene pipe 1 with a large diameter is
No. 1 rides on the existing cable 2 and does not enter the narrow gap (portion indicated by arrow (a)) between the pipeline 1 and the existing cable 2. Therefore, the wire rod 3 has a gap arrow (a).
It is possible to prevent the wire rod 3 from entering and the wire rod 3 can be prevented from moving. It should be noted that, when pushing in without covering the corrugated rigid polyethylene pipe 11, about 1
After pulling the wire for 30 m, the wire rod 3 could not be pulled back even by the human power of two people. On the other hand, when the corrugated rigid polyethylene pipe 11 was covered and pushed in as described above,
It was possible to pull back the wire rod 3 even by one person after the wire was passed for 80 m. The corrugated rigid polyethylene pipe 11 need not be distributed over the entire length of the wire rod 3,
As shown in FIG. 1, for example, it is effective to cover only a portion of about 50 m on the tip side. When the corrugated hard polyethylene pipe 11 is pushed by hand, the corrugated hard polyethylene pipe 11 is easily deformed and the pushing force is not transmitted to the wire rod 3. The pipe 11 is not covered over the entire length, but is covered at intervals and pushed in by holding the exposed portion of the wire rod 3 by hand. Moreover, since the corrugated rigid polyethylene pipe 11 is attached with a space, the corrugated rigid polyethylene pipe 11 is attached so that the wire rod 3
The bending rigidity of the whole does not unnecessarily increase, and the pushing operation does not become difficult.

【0010】図4に示すように,通線ロッド3に取り付
ける膨出体としてして,例えば高密度ポリエチレン製の
球状体12を用いてもよい。この球状体12は,通線ロ
ッド3が貫通する穴を有するとともに,前記の場合と同
様に片側が開くようにスリットを入れている。また,直
径は前記と同様に約28mmφ程度とするとよい。ま
た,図示のように通線ロッド3に例えば5m毎にロッド
外周から取り付ける。この球状体12によっても,通線
ロッド3が狭い隙間への入り込むことを防止でき,通線
ロッド3の円滑な押し込みが可能となる。
As shown in FIG. 4, a spherical body 12 made of high-density polyethylene, for example, may be used as the bulge attached to the wire rod 3. This spherical body 12 has a hole through which the wire rod 3 penetrates, and has a slit so that one side is opened as in the case described above. Further, the diameter is preferably about 28 mmφ as in the above. Further, as shown in the figure, the wire rod 3 is attached from the outer circumference of the rod every 5 m, for example. The spherical body 12 can also prevent the wire rod 3 from entering a narrow gap, and can smoothly push the wire rod 3.

【0011】なお,通線ロッド3に取り付ける膨出体
は,上述の波付硬質ポリエチレン管11や球状体12に
限定されない。要するに,通線ロッド3の径より大きな
径を形成するように通線ロッド3に取り付けられるもの
であればよい。
The bulging body attached to the wire rod 3 is not limited to the corrugated hard polyethylene pipe 11 and the spherical body 12 described above. In short, it may be attached to the wire rod 3 so as to form a diameter larger than the diameter of the wire rod 3.

【0012】[0012]

【発明の効果】本発明によれば,通線ロッドの外周に取
り付けた膨出体の存在により,通線ロッドが管路と既設
ケーブルとの狭い隙間に入り込むことを防止することが
でき,通線ロッドの押し込みおよび引き戻しが不可能に
なることを防止できる。
According to the present invention, the presence of the bulging member attached to the outer circumference of the wire rod can prevent the wire rod from entering the narrow gap between the conduit and the existing cable. It can be prevented that the wire rod cannot be pushed and pulled back.

【0013】請求項2によれば,波付形状であること,
および材質が硬質ポリエチレンであることにより,膨出
体の摩擦抵抗を低くすることができ,通線ロッド押し込
みの抵抗を低くできる。また,波付硬質ポリエチレン管
は可撓性を持ち,かつ外径が大きくても軽量なので,押
し込み作業は容易であり,膨出体として適切である。
According to claim 2, it has a corrugated shape,
Also, since the material is hard polyethylene, the frictional resistance of the bulging body can be reduced and the resistance of pushing the wire rod can be reduced. In addition, the corrugated rigid polyethylene pipe is flexible and lightweight even if it has a large outer diameter, so it is easy to push in and is suitable as a bulge.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の通線ロッド押し込み方法を説明するも
ので,膨出体としての波付硬質ポリエチレン管を取り付
けた状態の通線ロッドの側面図である。
FIG. 1 is a side view of a wire rod in which a corrugated hard polyethylene pipe as a bulging member is attached, for explaining the wire rod pushing method of the present invention.

【図2】図1における波付硬質ポリエチレン管の拡大斜
視図である。
FIG. 2 is an enlarged perspective view of a corrugated rigid polyethylene pipe in FIG.

【図3】図1の通線ロッドを押し込んでいる状態におけ
るケーブル既設管路の断面図である。
FIG. 3 is a cross-sectional view of a cable existing pipe line in a state where the wire rod of FIG. 1 is pushed in.

【図4】本発明の他の実施例を示すもので,膨出体とし
て球状体を用いた場合の通線ロッドの側面図である。
FIG. 4 shows another embodiment of the present invention and is a side view of a wire rod when a spherical body is used as a bulge.

【図5】本発明および従来に共通するケーブル既設管路
の断面図であり,ケーブル既設管路内に通線ロッドを押
し込む状況を説明する図である。
FIG. 5 is a cross-sectional view of an existing cable conduit common to the present invention and the related art, and is a diagram illustrating a situation in which a wire rod is pushed into the existing cable conduit.

【図6】従来の通線ロッド押し込み方法を示すもので,
ケーブル既設管路の断面図である。
FIG. 6 shows a conventional method for pushing a wire rod,
It is sectional drawing of a cable existing pipeline.

【符号の説明】[Explanation of symbols]

1 管路(ケーブル既設管路) 2 既設ケーブル 3 通線ロッド 11 波付硬質ポリエチレン管(膨出体) 12 球状体(膨出体) 1 Pipeline (Existing Pipeline for Cable) 2 Existing Cable 3 Wire Rod 11 Rigid Polyethylene Pipe with Wave (Swelling Body) 12 Spherical Body (Swelling Body)

───────────────────────────────────────────────────── フロントページの続き (72)発明者 高塚 潔 東京都江東区木場1丁目5番1号 株式会 社フジクラ内 (72)発明者 和田 亨 東京都江東区木場1丁目5番1号 株式会 社フジクラ内 (72)発明者 倉部 昌也 東京都江東区木場1丁目5番1号 株式会 社フジクラ内 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kiyoshi Takatsuka 1-5-1 Kiba, Koto-ku, Tokyo Fujikura Ltd. (72) Inventor Toru Wada 1-5-1 Kiba, Koto-ku, Tokyo Stock Association In Fujikura, Ltd. (72) Inventor Masaya Kurabe 1-5-1, Kiba, Koto-ku, Tokyo Stock Company In Fujikura

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 ケーブル既設管路内に通線ロッドを押し
込むに際して,通線ロッドの外周にロッド長手方向に間
隔をあけて膨出体を取り付けつつ通線ロッドを押し込む
ことを特徴とするケーブル既設管路内への通線ロッドの
押し込み方法。
1. When the conduit rod is pushed into the existing conduit of the cable, the conductor rod is pushed while the bulging bodies are attached to the outer periphery of the conduit rod at intervals in the longitudinal direction of the rod. How to push the wire rod into the pipeline.
【請求項2】 前記膨出体として通線ロッドの外周に波
付硬質ポリエチレン管を被せたことを特徴とする請求項
1記載のケーブル既設管路内への通線ロッドの押し込み
方法。
2. The method of pushing a wire rod into an existing conduit of a cable according to claim 1, wherein a corrugated hard polyethylene pipe is covered on the outer periphery of the wire rod as the swelling body.
【請求項3】 前記膨出体として通線ロッドが貫通する
ように球状体を取り付けたことを特徴とする請求項1記
載のケーブル既設管路内への通線ロッドの押し込み方
法。
3. The method of pushing a wire rod into a cable existing conduit according to claim 1, wherein a spherical body is attached as the bulge so that the wire rod passes through.
JP4779795A 1995-02-13 1995-02-13 Push-in method of wire drawing rod into cable duct Pending JPH08223731A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4779795A JPH08223731A (en) 1995-02-13 1995-02-13 Push-in method of wire drawing rod into cable duct

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4779795A JPH08223731A (en) 1995-02-13 1995-02-13 Push-in method of wire drawing rod into cable duct

Publications (1)

Publication Number Publication Date
JPH08223731A true JPH08223731A (en) 1996-08-30

Family

ID=12785369

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4779795A Pending JPH08223731A (en) 1995-02-13 1995-02-13 Push-in method of wire drawing rod into cable duct

Country Status (1)

Country Link
JP (1) JPH08223731A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105378437A (en) * 2013-05-10 2016-03-02 公益财团法人地球环境产业技术研究机构 Optical fiber cable, optical fiber cable manufacturing method, and distributed measurement system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105378437A (en) * 2013-05-10 2016-03-02 公益财团法人地球环境产业技术研究机构 Optical fiber cable, optical fiber cable manufacturing method, and distributed measurement system

Similar Documents

Publication Publication Date Title
US4920235A (en) Conductive cable sheath
JP2567757B2 (en) Method of laying wiring / piping material in pipe, laying device for this, and pipe for wiring / piping used for this
JP2006171570A (en) Optical fiber cable
JPH08223731A (en) Push-in method of wire drawing rod into cable duct
JPH11185534A (en) Cable fitted with rip cord
JP3333349B2 (en) Optical sensor fiber cable laying method
JPH06174985A (en) Optical cable for laying by winding or attaching
JP2780456B2 (en) Terminal section of optical / electric power composite cable
JP3256402B2 (en) Debit method
JP2523599Y2 (en) Optical fiber guide device
JPH10199345A (en) Optical fiber element
JPH11234833A (en) Tube inserting jig and tube inserting method using it
JPH0353562Y2 (en)
JP2830143B2 (en) Optical cable
JP2598206Y2 (en) Tube and cable storage material
JP3242545B2 (en) Optical cable connection box and connection method
JP3616995B2 (en) Laying method of flexible tube
JP2000120926A (en) Piping work method
JPH10201035A (en) Tip tool for drawing lead
JPH048572Y2 (en)
JPH0455285Y2 (en)
JP4273477B2 (en) Drop cable coil and drop cable pulling method
JP3000969B2 (en) Construction method of pipe
JP2557236Y2 (en) Propulsion body
JP2894046B2 (en) Corrugated flexible pipe laying method