JPH0693331B2 - Power cable installed in pipeline - Google Patents
Power cable installed in pipelineInfo
- Publication number
- JPH0693331B2 JPH0693331B2 JP20754989A JP20754989A JPH0693331B2 JP H0693331 B2 JPH0693331 B2 JP H0693331B2 JP 20754989 A JP20754989 A JP 20754989A JP 20754989 A JP20754989 A JP 20754989A JP H0693331 B2 JPH0693331 B2 JP H0693331B2
- Authority
- JP
- Japan
- Prior art keywords
- power cable
- linear body
- snake
- pipeline
- linear
- 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
- 241000270295 Serpentes Species 0.000 claims description 30
- 238000004804 winding Methods 0.000 claims description 21
- 238000005452 bending Methods 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 6
- 230000008602 contraction Effects 0.000 description 18
- 238000000034 method Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Insulated Conductors (AREA)
- Details Of Indoor Wiring (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、管路内布設電力ケーブルに関し、特に管路内
で自己のスネークにより熱伸縮を吸収するために、線状
体をスパイラル状に巻き付けた電力ケーブルに関する。Description: TECHNICAL FIELD The present invention relates to a power cable installed in a pipeline, and particularly, in order to absorb thermal expansion and contraction by its own snake in the pipeline, a linear body is formed into a spiral shape. Regarding a wrapped power cable.
近年、既設の管路を利用して電力ケーブルを引き込み布
設することが行われており、その場合、人孔部に余裕が
なくそこで設定するオフセット寸法に制約が加わる場合
が多々ある。そこで、人孔部におけるオフセット部の熱
伸縮を抑制し、管路内で電力ケーブルをスネークさせる
ことにより、電力ケーブル自身の熱伸縮を吸収させるこ
とが行われている。In recent years, it has been practiced to draw and lay an electric power cable using an existing pipeline, and in that case, there is often no margin in the human hole portion, and restrictions are often placed on the offset dimension set there. Therefore, thermal expansion and contraction of the offset portion in the human hole is suppressed, and the thermal expansion and contraction of the electric power cable itself is absorbed by causing the electric power cable to snake in the conduit.
管路内で、電力ケーブル自身にスネーク形状を与える手
段としては、一般に電力ケーブル本体の周上に線状体を
所定ピッチでスパイラル状に巻き付け、電力ケーブルが
熱伸縮を生ずるときに当該線状体の巻き付けによって当
該電力ケーブルが自らスネーク状態を形成するのを助成
する方式が良く知られていた。As a means of giving a snake shape to the power cable itself in the pipeline, generally, a linear body is spirally wound around the periphery of the power cable body at a predetermined pitch, and when the power cable causes thermal expansion and contraction, the linear body concerned. A method of assisting the power cable to form a snake state by winding the power cable has been well known.
第３図は、そのような管路内布設電力ケーブルの概略を
示したもので、人孔部MH1とMH2との間の管路Ｐ内におい
て、電力ケーブルＣがスネーク形状をとりながら通され
ており、そして電力ケーブルＣの端末は、管路口より突
き出して人孔部MH1，MH2内においてオフセット形状をと
って接続箱J1，J2に終端接続されている。FIG. 3 shows an outline of such a power cable laid in the pipeline. In the pipeline P between the human hole portions MH 1 and MH 2 , the power cable C passes through while taking a snake shape. The end of the electric power cable C is connected to the junction boxes J 1 and J 2 by projecting from the conduit opening and taking an offset shape in the human holes MH 1 and MH 2 .
人孔部MH1，MH2内における電力ケーブルＣのオフセット
部分は、熱伸縮装置が付設され、電力ケーブルＣの熱伸
縮による動きを抑制するようにしてある。A thermal expansion / contraction device is attached to the offset portion of the power cable C in the human hole portions MH 1 and MH 2 so as to suppress the movement of the power cable C due to the thermal expansion / contraction.
Ｓは、管路Ｐ内の電力ケーブルＣに所定のピッチでスパ
イラル状に巻き付けられた線状体で、それの存在によっ
て電力ケーブルＣに対して熱伸縮時にスネークが惹起す
るものとしてある。S is a linear body spirally wound around the electric power cable C in the conduit P at a predetermined pitch, and the presence of the linear body S causes a snake to cause thermal expansion and contraction of the electric power cable C.
ところで、かかる線状体Ｓは、これを電力ケーブルＣに
只単に巻き付けただけでは、電力ケーブルＣにスネーク
形状が起こりにくく、そのため線状体Ｓ等に対して種々
の改変がなされてきた。By the way, in such a linear body S, a snake shape is unlikely to occur in the power cable C simply by winding the linear body S around the power cable C. Therefore, various modifications have been made to the linear body S and the like.
例えば、特公昭39−20972号公報に開示されているよう
に、電力ケーブルに巻き付けられた線状体の両端に錘を
繋いで該線状体に張力を加え、ケーブルの熱伸縮時のス
ネーク発生を起こし易くする方法や、特公昭57−27641
号公報に開示されているように、長さ方向所々を太くし
た線状体を電力ケーブルにスパイラル巻きし、線状体の
太くなった部分でケーブルの支持する方法が提案されて
いた。For example, as disclosed in Japanese Examined Patent Publication No. 39-20972, a weight is connected to both ends of a linear body wound around a power cable and tension is applied to the linear body to generate a snake when the cable thermally expands and contracts. And the Japanese Patent Publication 57-27641
As disclosed in the publication, there has been proposed a method of spirally winding a linear body having thick portions in the length direction and supporting the cable at the thickened portion of the linear body.
特公昭39−20972号公報に開示された方法によれば、 張力を加えられた線状体が電力ケーブルの表面（PVC
防食層等の外被）に食い込んで該ケーブル表面に外傷を
負わせ、ケーブル内への浸水等を招くことでケーブルの
寿命を著しく縮める恐れがある。According to the method disclosed in Japanese Examined Patent Publication No. 39-20972, the tensioned linear member is attached to the surface of the power cable (PVC).
There is a possibility that the cable life may be significantly shortened by eroding the cable surface by damaging the outer surface of the anticorrosion layer or the like to damage the surface of the cable and cause water to enter the cable.
線状体に張力を加えるために該線状体の端末に繋ぐ錘
が人孔部内に配置することとしているが、余裕がなく狭
い人孔部内にはそのような設置スペースが取ることは困
難であり、現実的でない。The weight connected to the end of the linear body is arranged in the human hole to apply tension to the linear body, but it is difficult to make such an installation space in the narrow human hole because there is no room. Yes, not realistic.
特公昭57−27641号公報に開示された方法によれば、 一定間隔に太くなった線状体の製作が困難であり、特
殊な製造設備を必要とする等、経済的なものとして提供
するには実現性に乏しい。According to the method disclosed in Japanese Examined Patent Publication No. 57-27641, it is difficult to manufacture a linear body thickened at regular intervals, and a special manufacturing facility is required. Is not feasible.
電力ケーブルの周りに線状体を巻くことによって該線
状体を含めた電力ケーブルの外径が大きくなり、既設の
空き管路を利用して布設する場合には、該管路径によっ
て適用できなくなる場合もあり、利用範囲が限定されて
しまう。By wrapping the linear body around the power cable, the outer diameter of the power cable including the linear body becomes large, and when laying using an existing empty pipeline, it cannot be applied depending on the pipeline diameter. In some cases, the range of use is limited.
本発明は、以上の従来技術の問題点に鑑み、電力ケーブ
ル本体に巻き付ける線状体に関して特別な改変を行うこ
となしに、電力ケーブル熱伸縮に際してのスネーク形成
が極めて容易に成就できる管路内布設電力ケーブルを提
供することに目的がある。In view of the above-mentioned problems of the prior art, the present invention provides a pipe line laying which can extremely easily achieve snake formation during heat expansion and contraction of a power cable without making any special modification to the linear body wound around the power cable body. The purpose is to provide a power cable.
〔課題を解決するための手段〕 本発明によれば、電力ケーブル本体とその周上に所定の
ピッチでスパイラル状に巻き付ける線状体とからなり、
当該線状体に関して、該線状体の外径ｄと電力ケーブル
の曲げ剛性EIと同ケーブルの重量ｗとで一義的に決定さ
れる最適な巻き付けピッチＬを選定することにある。[Means for Solving the Problems] According to the present invention, the power cable main body and a linear member wound around the periphery thereof in a spiral shape at a predetermined pitch,
With respect to the linear body, the optimum winding pitch L is uniquely determined by the outer diameter d of the linear body, the bending rigidity EI of the power cable, and the weight w of the cable.
さらに具体的には、当該線状体に関して、該線状体の外
径ｄと電力ケーブルの曲げ剛性EIと同ケーブルの重量ｗ
とで一義的に決定される巻き付けピッチＬを、下記式に
より求まる電力ケーブルのスネーク軸力Ｆを最小となる
ように値を選定することにある。More specifically, regarding the linear body, the outer diameter d of the linear body, the bending rigidity EI of the power cable, and the weight w of the cable.
The winding pitch L that is uniquely determined by and is selected so as to minimize the snake axial force F of the power cable obtained by the following equation.
但し、 上記式中、Ａは電力ケーブルの導体断面積、Ｅは電力ケ
ーブルのヤング率、βは電力ケーブルの線膨張係数、Ｔ
は電力ケーブルの導体温度変化である。 However, In the above equation, A is the conductor cross-sectional area of the power cable, E is the Young's modulus of the power cable, β is the linear expansion coefficient of the power cable, and T is
Is the change in the conductor temperature of the power cable.
線状体は、ゴム、プラスチック製またはアルミニウム、
鉄（ステンレス鋼）等の金属製のものが適用できる。或
いは金属線を芯として外周にプラスチック材を押出被覆
した複合線も適用できる。The linear body is made of rubber, plastic or aluminum,
Materials made of metal such as iron (stainless steel) can be applied. Alternatively, a composite wire in which a metal wire is used as a core and an outer periphery is extrusion-coated with a plastic material can also be applied.
なお、本発明にかかる管路内布設電力ケーブルが有効に
採用できるのは、管路内径Ｄ′が次の範囲となる場合で
ある。The power cable installed in the pipeline according to the present invention can be effectively used when the pipeline inner diameter D'is within the following range.
Ｄ′＜2.16D＋α （D:電力ケーブル外径、α：電力ケーブルと管路との隙
間；余裕（通常20〜50mm） つまり、管路内径Ｄ′が（2.16D＋α）以上であれば、
トリプレックス形ケーブルができるものとなり、本発明
のように単心電力ケーブルに対する線状体を巻き付ける
ことが必要でなくなるからである。D '<2.16D + α (D: power cable outer diameter, α: gap between power cable and pipeline; margin (usually 20 to 50 mm) That is, if pipeline inner diameter D'is (2.16D + α) or more,
This is because a triplex type cable can be formed, and it is not necessary to wind the linear body around the single core power cable as in the present invention.
以下、第１図及び第２図に基づいて具体的に説明する。 Hereinafter, a specific description will be given with reference to FIGS. 1 and 2.
第１図は、電力ケーブル本体２の外周に線状体１を所定
のピッチでスパイラル状に巻き付けた電力ケーブル３を
管路４内に直線状にして引き込み布設された状態を示す
ものである。図から明らかなように、引き込み布設直後
における電力ケーブル本体２は、直線状態であって、一
定のピッチＬで電力ケーブル本体２の下面に隆起する線
状体１の下側部分で管路３の内底面に接触し、それらの
間では電力ケーブル本体２が管路内底面から離間してい
る。FIG. 1 shows a state in which a power cable 3 in which a linear body 1 is spirally wound around a power cable main body 2 at a predetermined pitch is linearly drawn into a conduit 4 and installed. As is clear from the figure, the power cable main body 2 immediately after being drawn and laid is in a straight line state, and at the lower portion of the linear body 1 which is raised on the lower surface of the power cable main body 2 at a constant pitch L, the conduit 3 is formed. It contacts the inner bottom surface, and the power cable body 2 is separated from the inner bottom surface of the conduit between them.
かかる初期状態は、線状体１の巻き付けピッチＬがどの
ような値であろうとも変わりはないが、当該線状体１の
巻き付けピッチＬが或る値を上回ると、線状体１の下側
隆起部分間で支えられている電力ケーブル本体２の直線
部分が自己の重みで時間の経過とともに下方へ弓形状に
撓み、終局的には第２図に示すようなスネーク布設状態
に撓むこととなる。つまり、線状体１の巻き付けピッチ
Ｌとそれ自身の太さｄに依存したスネーク形状が電力ケ
ーブル本体２に与えられる。The initial state does not change regardless of the winding pitch L of the linear body 1, but when the winding pitch L of the linear body 1 exceeds a certain value, the linear body 1 is lowered. The straight portion of the power cable main body 2 supported between the side ridges bends downward with time due to its own weight into a bow shape, and finally bends into a snake laying state as shown in FIG. Becomes That is, the snake shape depending on the winding pitch L of the linear body 1 and the thickness d of itself is given to the power cable main body 2.
かかる状態において、電力ケーブル本体２が通電による
熱伸縮を起こそうとするときには、電力ケーブル本体２
が、上記のようにして得られた初期のスネーク形状を管
路３内で変化させて伸縮変形することとなる。In such a state, when the power cable main body 2 is about to expand or contract due to energization, the power cable main body 2
However, the initial snake shape obtained as described above is changed in the conduit 3 to be expanded and contracted.
但し、かかる巻き付けピッチＬが大き過ぎる場合には、
電力ケーブル本体２自身の初期スネーク形状が直線状態
に近づくので、初期スネーク形状による布設後のスネー
ク変形への移行が困難となり、電力ケーブル本体２にお
ける熱伸縮時の軸力が相対的に大きくなり、人孔部内で
電力ケーブル本体２の端末のオフセット部に付帯する熱
伸縮抑制装置（第３図参照）に対する応力負担が顕著と
なり、該熱伸縮抑制装置による伸縮抑制効果が失われて
しまう恐れすらあった。However, if the winding pitch L is too large,
Since the initial snake shape of the power cable body 2 itself approaches a linear state, it becomes difficult to shift to snake deformation after installation due to the initial snake shape, and the axial force of the power cable body 2 during thermal expansion and contraction becomes relatively large, The stress load on the thermal expansion / contraction suppressing device (see FIG. 3) incidental to the offset portion of the terminal of the power cable main body 2 inside the human hole becomes remarkable, and the expansion / contraction suppressing effect of the thermal expansion / contraction suppressing device may be lost. It was
以上のようなことから、本発明では、線状体１の巻き付
けピッチＬとそれ自身の太さｄを、電力ケーブル本体２
自身の曲げ剛性EI及び重量ｗに応じて最適な数値を選ぶ
ものである。From the above, in the present invention, the winding pitch L of the linear body 1 and the thickness d of itself are determined by the power cable main body 2
The optimum value is selected according to the bending rigidity EI and the weight w.
以下、線状体１の太さｄと電力ケーブル本体２に対する
巻き付けピッチＬの決定に関する手法について説明す
る。Hereinafter, a method for determining the thickness d of the linear body 1 and the winding pitch L around the power cable body 2 will be described.
線状体１の太さｄの決定方法 線状体１は太ければ太い程好ましいが、所定サイズの管
路３に引き入れられることが条件となるので、電力ケー
ブル本体１の外径Ｄと管路３の内径Ｄ′との関係で下記
（１）式の条件を満足する外径を選ぶ。Method for Determining Thickness d of Linear Body 1 The thicker the linear body 1 is, the more preferable it is, but the condition is that the linear body 1 is drawn into the pipe line 3 of a predetermined size. An outer diameter satisfying the condition of the following expression (1) is selected in relation to the inner diameter D ′ of the passage 3.
Ｄ＋2d＋α＜Ｄ′……（１） （αは線状体１を含めた電力ケーブルの外径と管路３と
の間の余隙で、布設後のスネーク変形を見越して、通常
20〜50mmとする。） 線状体１の巻き付けピッチＬの決定方法 上記（１）式により選びだされた外径ｄの線状体１が選
びだされれば、それに合わせて以下の（２）式により求
まる電力ケーブル本体２のスネーク軸力Ｆが最小となる
ように巻き付けピッチＬを求めれば良い。D + 2d + α <D '... (1) (α is the gap between the outer diameter of the power cable including the linear body 1 and the pipe 3, and is usually in consideration of snake deformation after installation.
20 to 50 mm. ) Method for determining the winding pitch L of the linear body 1 If the linear body 1 having the outer diameter d selected by the above formula (1) is selected, the power cable obtained by the following formula (2) accordingly. The winding pitch L may be obtained so that the snake axial force F of the main body 2 is minimized.
但し、 （上記式中、Ａは電力ケーブル本体の導体断面積、Ｅは
同ケーブル本体のヤング率、βは同ケーブルの線膨張係
数、Ｔは同ケーブルの導体温度変化を示す。） 以上のような手法に基づいて、実際に77kv1×1500mm2の
電力ケーブルに外径ｄが20mmの線状体をピッチＬが2.5m
でスパイラルに巻き付けた結果、線状体１を巻き付けて
いない電力ケーブルに比して、スネーク軸力Ｆが約1/2
に低減することができ、而も巻き付けピッチＬ＝2.5mに
より巻き付けた場合には、管路内での初期スネーク形状
が十分に得られており、布設後の熱伸縮をケーブル自身
のスネーク変形により容易に吸収されることが確認する
ことができた。 However, (In the above formula, A is the conductor cross-sectional area of the power cable body, E is the Young's modulus of the cable body, β is the linear expansion coefficient of the cable, and T is the conductor temperature change of the cable.) Based on the above, we actually used a 77kv1 × 1500mm 2 power cable with a linear body with an outer diameter d of 20mm and a pitch L of 2.5m.
As a result of spiral winding, the snake axial force F is about 1/2 of that of a power cable in which the linear body 1 is not wound.
When the winding pitch is L = 2.5m, the initial snake shape in the pipeline is sufficiently obtained, and the thermal expansion and contraction after laying is caused by the snake deformation of the cable itself. It was confirmed that it was easily absorbed.
以上の説明によって明らかな通り、本発明の管路内布設
電力ケーブルによれば、線状体の巻き付けピッチＬとそ
れ自身の太さｄを、電力ケーブル本体自身の曲げ剛性EI
及び重量ｗに応じて最適な数値を選ぶものであり、それ
によって、線状体の下側隆起部分で管路内底面上に支え
られている電力ケーブル本体の直線部分が自己の重みで
時間の経過とともに下方へ弓形状に撓み、終局的にはス
ネーク布設状態に撓むこととなり、線状体の巻き付けピ
ッチＬとそれ自身の太さｄに依存したスネーク形状が電
力ケーブル本体に必然的に与えられるものである。As is clear from the above description, according to the power cable installed in the pipeline of the present invention, the winding pitch L of the linear body and the thickness d of itself are determined by the bending rigidity EI of the power cable itself.
And an optimal value is selected according to the weight w, whereby the linear portion of the power cable main body supported on the bottom surface inside the conduit by the lower raised portion of the linear body is self-weighted for time. It bends downward in a bow shape with the lapse of time, and finally bends into a snake laying state, and the snake shape depending on the winding pitch L of the linear body and the thickness d of itself is inevitably given to the power cable body. It is what is done.
このようなことから、 管路内径が十分でなく太い線状体を適用できない場合
であっても、ケーブル引き入れが可能な範囲で線状体の
太さを選び、そして電力ケーブルのスネーク軸力が最小
となるようにその巻き付けピッチを計算により求めるこ
とで、電力ケーブルの管路内でのスネーク発生を容易に
実現することが可能となる。Therefore, even if the inner diameter of the conduit is not sufficient and a thick linear body cannot be applied, the thickness of the linear body should be selected within the range where the cable can be pulled in, and the snake axial force of the power cable By obtaining the winding pitch by calculation so as to minimize it, it becomes possible to easily realize the generation of the snake in the conduit of the power cable.
大サイズの単心電力ケーブルの場合のように熱伸縮に
伴う軸力が大きくなるものであっても、初期のスネーク
付与が確実になされるので、布設後の熱伸縮を無理なく
確実に行わせることができる。Even if the axial force that accompanies thermal expansion and contraction becomes large as in the case of a large size single-core power cable, the initial snake will be surely applied, so that thermal expansion and contraction after installation can be performed without difficulty. be able to.
オフセット部での熱伸縮抑制装置により伸縮を強制的
に抑制した場合には、管路内に延びる電力ケーブルに局
部的な座屈を発生させようとし、また、従来の線状体巻
き付け構造では、ケーブルの外被に局部的に大きな側圧
や歪みを生じさせ易いが、本発明によれば、通常の線状
体を用いてピッチで特定して巻き付けることとしている
ため、ケーブル本体が巻き付けられた線状体によって局
部的に大きな側圧や歪みを生ぜず、また、線状体の巻き
付けに伴い管路内の電力ケーブル全長において、熱伸縮
に伴う曲げ変形を分散させることができ、電力ケーブル
の信頼性を維持する上で最適なものとなる。When the expansion and contraction is suppressed forcibly by the thermal expansion and contraction suppressing device in the offset part, an attempt is made to cause local buckling in the power cable extending into the pipeline, and in the conventional linear body winding structure, Although it is easy to locally generate a large lateral pressure or strain on the outer sheath of the cable, according to the present invention, since the normal linear member is used to specify and wind the pitch, the wire on which the cable main body is wound is used. The shape does not locally generate a large lateral pressure or strain, and the bending deformation due to thermal expansion and contraction can be dispersed in the entire length of the power cable in the pipeline due to the winding of the linear body, and the reliability of the power cable is improved. Will be the best one to maintain.
等々の利益を享受することができ、従って、電力ケーブ
ル本体に巻き付ける線状体に関して特別な改変を行うこ
となしに、電力ケーブル熱伸縮に際してのスネーク形成
が極めて容易に成就できる管路内布設電力ケーブルを提
供するという所期の目的が十分に達成され、実用上の効
果は大きいものといえる。Therefore, it is possible to enjoy the benefits of the power cable. Therefore, it is possible to achieve the snake formation extremely easily when the power cable is expanded and contracted without making any special modification to the wire wound around the power cable body. It can be said that the intended purpose of providing the product is sufficiently achieved, and the practical effect is great.
第１図（ａ）及び（ｂ）は、本発明の管路内布設電力ケ
ーブルの実施例を説明する横断面説明図及び縦断面説明
図、第２図は同上ケーブルの布設後の熱挙動を伴った状
況を示す縦断面説明図、第３図はスネーク布設による管
路内布設電力ケーブルの概略を示す説明図である。 図中、１は線状体、２は電力ケーブル本体、３は管路で
ある。1 (a) and 1 (b) are cross-sectional explanatory views and vertical cross-sectional explanatory views for explaining an embodiment of the power cable installed in a pipeline of the present invention, and FIG. 2 shows the thermal behavior after the cable is installed. FIG. 3 is an explanatory view of a longitudinal section showing the accompanying situation, and FIG. 3 is an explanatory view showing an outline of a power cable installed in a pipeline by snake installation. In the figure, 1 is a linear body, 2 is a power cable body, and 3 is a conduit.
Claims (1)
力ケーブルにおいて、電力ケーブル本体とその周上に所
定のピッチでスパイラル状に巻き付ける線状体とからな
り、当該線状体に関して、該線状体の外径ｄと電力ケー
ブルの曲げ剛性EIと同ケーブルの重量ｗとで一義的に決
定される巻き付けピッチＬを、下記式により求まる電力
ケーブルのスネーク軸力Ｆを最小となるように値を選定
することを特徴とする管路内布設電力ケーブル。 但し、 上記式中、Ａは電力ケーブルの導体断面積、Ｅは電力ケ
ーブルのヤング率、βは電力ケーブルの線膨張係数、Ｔ
は電力ケーブルの導体温度変化である。1. A power cable laid so as to be capable of imparting a snake in a pipeline, comprising a power cable main body and a linear body wound spirally around the periphery of the power cable at a predetermined pitch. The winding pitch L that is uniquely determined by the outer diameter d of the linear body, the bending rigidity EI of the power cable, and the weight w of the power cable is set so that the snake axial force F of the power cable obtained by the following formula is minimized. A power cable installed in a pipeline characterized by selecting a value. However, In the above equation, A is the conductor cross-sectional area of the power cable, E is the Young's modulus of the power cable, β is the linear expansion coefficient of the power cable, and T is
Is the change in the conductor temperature of the power cable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20754989A JPH0693331B2 (en) | 1989-08-10 | 1989-08-10 | Power cable installed in pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20754989A JPH0693331B2 (en) | 1989-08-10 | 1989-08-10 | Power cable installed in pipeline |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0371513A JPH0371513A (en) | 1991-03-27 |
| JPH0693331B2 true JPH0693331B2 (en) | 1994-11-16 |
Family
ID=16541575
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20754989A Expired - Lifetime JPH0693331B2 (en) | 1989-08-10 | 1989-08-10 | Power cable installed in pipeline |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0693331B2 (en) |
-
1989
- 1989-08-10 JP JP20754989A patent/JPH0693331B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0371513A (en) | 1991-03-27 |
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