JP2000350347A - Splice of fire-proof cable - Google Patents
Splice of fire-proof cableInfo
- Publication number
- JP2000350347A JP2000350347A JP2000089838A JP2000089838A JP2000350347A JP 2000350347 A JP2000350347 A JP 2000350347A JP 2000089838 A JP2000089838 A JP 2000089838A JP 2000089838 A JP2000089838 A JP 2000089838A JP 2000350347 A JP2000350347 A JP 2000350347A
- Authority
- JP
- Japan
- Prior art keywords
- fire
- coating
- cable
- resistant
- tape
- 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
- 238000000576 coating method Methods 0.000 claims abstract description 77
- 239000011248 coating agent Substances 0.000 claims abstract description 75
- 239000004020 conductor Substances 0.000 claims abstract description 67
- 238000000034 method Methods 0.000 claims abstract description 14
- 230000004927 fusion Effects 0.000 claims abstract description 3
- 230000009970 fire resistant effect Effects 0.000 claims description 57
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims description 40
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 24
- 229910010272 inorganic material Inorganic materials 0.000 claims description 17
- 239000011147 inorganic material Substances 0.000 claims description 17
- 238000007751 thermal spraying Methods 0.000 claims description 6
- 150000004767 nitrides Chemical class 0.000 claims description 4
- 230000000737 periodic effect Effects 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 9
- 238000009413 insulation Methods 0.000 abstract description 9
- 238000000465 moulding Methods 0.000 abstract description 4
- 239000011253 protective coating Substances 0.000 abstract description 3
- 238000005507 spraying Methods 0.000 abstract description 3
- 239000004065 semiconductor Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 43
- 230000002093 peripheral effect Effects 0.000 description 23
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 19
- 239000000126 substance Substances 0.000 description 19
- 229920001971 elastomer Polymers 0.000 description 16
- 229910052802 copper Inorganic materials 0.000 description 14
- 239000010949 copper Substances 0.000 description 14
- 239000010445 mica Substances 0.000 description 11
- 229910052618 mica group Inorganic materials 0.000 description 11
- 238000004804 winding Methods 0.000 description 8
- 239000012212 insulator Substances 0.000 description 7
- 239000002356 single layer Substances 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000011241 protective layer Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 238000005240 physical vapour deposition Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000002788 crimping Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002320 enamel (paints) Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052735 hafnium Inorganic materials 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 1
- -1 polytetrafluoroethylene Polymers 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
Landscapes
- Chemical Vapour Deposition (AREA)
- Coating By Spraying Or Casting (AREA)
- Electric Cable Installation (AREA)
- Cable Accessories (AREA)
- Physical Vapour Deposition (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ケーブル導体同士
をつなぐ導体接続管の外周に耐火被覆を具える耐火ケー
ブル接続部に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fire-resistant cable connecting portion having a fire-resistant coating on the outer periphery of a conductor connecting pipe connecting cable conductors.
【０００２】[0002]
【従来の技術】一般にケーブルの接続は、切断されたケ
ーブル端部において導体の外周に具える各被覆を段剥ぎ
して撚線導体を露出させ、この露出させた撚線導体を突
き合わせて導体接続管で接続し、導体接続管を含む接続
部に被覆を施すことで行う。例えば、高圧耐火ケーブル
の場合、ケーブル端部には、段剥ぎにより順に撚線導体
・耐火層・ケーブル絶縁体・半導電層・遮蔽銅テープ・
耐火保護層・ケーブルシースの各被覆が露出しており、
導体接続後、耐火層以下これらを順に被覆していく。な
お、耐火ケーブルとは、一般に撚線導体の外周面に内周
から順に耐火・絶縁を目的とした被覆を施したものであ
る。2. Description of the Related Art Generally, a cable is connected by cutting off each coating provided on the outer periphery of a conductor at a cut end of the cable to expose a stranded conductor, and abutting the exposed stranded conductor to connect the conductor. It is performed by connecting with a pipe and coating the connection part including the conductor connection pipe. For example, in the case of a high-pressure fire-resistant cable, the cable ends are stripped in order by twisting conductor, fire-resistant layer, cable insulator, semiconductive layer, shielding copper tape,
Each coating of fire protection layer and cable sheath is exposed,
After the conductors are connected, these layers are coated in order below the refractory layer. Note that a fire-resistant cable is generally obtained by coating the outer circumferential surface of a stranded wire conductor in order from the inner circumference for the purpose of fire resistance and insulation.
【０００３】例えば、図５に示す直線状の高圧耐火ケー
ブル接続部の場合は、以下のような手順でケーブルを接
続し、絶縁保護被覆を施している。 (1) 露出させた撚線導体１を突き合わせて圧縮型導体
接続管２に挿入させ、接続管２を圧縮し撚線導体１を固
着する。 (2) 上記接続管２と耐火層12の端部との隙間に露出し
ている撚線導体１には、耐火層12から接続管２の方向に
自己融着絶縁テープ４を巻き付ける。このとき絶縁テー
プ４は、撚線導体１と接続管２との間に段差がないよう
に巻き付ける。 (3) 段剥ぎにより露出している耐火層12から他端の耐
火層12へケーブルの長さ方向に絶縁テープ４の外周面を
含めて接続管２の外周面にマイカテープ３を巻き付け
る。 (4) 段剥ぎにより露出しているケーブル絶縁体13から
他端のケーブル絶縁体13へケーブルの長さ方向にマイカ
テープ３の外周面を含めてケーブル絶縁体13を覆うよう
に自己融着絶縁テープ４を巻き付ける。For example, in the case of a straight high-pressure fire-resistant cable connecting portion shown in FIG. 5, a cable is connected in the following procedure and an insulating protective coating is applied. (1) The exposed stranded conductor 1 is butted and inserted into the compression-type conductor connection pipe 2, and the connection pipe 2 is compressed to fix the stranded conductor 1. (2) The self-fusing insulating tape 4 is wound around the stranded conductor 1 exposed in the gap between the connection pipe 2 and the end of the fireproof layer 12 in the direction from the fireproof layer 12 to the connection pipe 2. At this time, the insulating tape 4 is wound so that there is no step between the stranded conductor 1 and the connection pipe 2. (3) The mica tape 3 is wound around the outer peripheral surface of the connection pipe 2 including the outer peripheral surface of the insulating tape 4 in the length direction of the cable from the refractory layer 12 exposed by the stepping to the refractory layer 12 at the other end. (4) Self-fusing insulation from the cable insulator 13 exposed by the step stripping to the cable insulator 13 at the other end so as to cover the cable insulator 13 including the outer peripheral surface of the mica tape 3 in the length direction of the cable. Wind the tape 4.
【０００４】(5) 段剥ぎにより露出している半導電層1
4から他端の半導電層14へケーブルの長さ方向に絶縁テ
ープ４の外周面に半導電性テープ５を巻き付ける。 (6) 段剥ぎにより露出している遮蔽銅テープ15から他
端の遮蔽銅テープ15へ ケーブルの長さ方向に銅線６をつなぐ。 (7) 段剥ぎにより露出している耐火保護層16から他端
の耐火保護層16へケーブルの長さ方向に銅線６の外周面
に耐火テープ７を巻き付ける。 (8) ケーブルシース17から他端のケーブルシース17へ
ケーブルの長さ方向へ耐火テープ７の外周面に自己融着
絶縁テープ４を巻き付ける。 (9) ケーブルシース17から他端のケーブルシース17へ
ケーブルの長さ方向へ絶縁テープ４の外周面に防水テー
プ８を巻き付ける。 (10) ケーブルシース17から他端のケーブルシース17へ
ケーブルの長さ方向へ防水テープ８の外周面に保護テー
プ９を巻き付ける。(5) Semiconductive layer 1 exposed by stepping off
The semiconductive tape 5 is wound around the outer peripheral surface of the insulating tape 4 in the length direction of the cable from the 4 to the semiconductive layer 14 at the other end. (6) Connect the copper wire 6 in the length direction of the cable from the shielded copper tape 15 exposed by step stripping to the shielded copper tape 15 at the other end. (7) Wind the fire-resistant tape 7 around the outer peripheral surface of the copper wire 6 in the length direction of the cable from the fire-resistant protective layer 16 exposed by the step peeling to the fire-resistant protective layer 16 at the other end. (8) The self-fusing insulating tape 4 is wound around the outer peripheral surface of the fireproof tape 7 in the length direction of the cable from the cable sheath 17 to the other cable sheath 17. (9) Wind the waterproof tape 8 around the outer peripheral surface of the insulating tape 4 in the length direction of the cable from the cable sheath 17 to the other cable sheath 17. (10) Wrap the protective tape 9 around the outer peripheral surface of the waterproof tape 8 in the length direction of the cable from the cable sheath 17 to the other cable sheath 17.
【０００５】一方、本線ケーブルに他のケーブルを接続
させた図１に示すような分岐部分を有するケーブル接続
部（ここではＴ字型）がある。この分岐接続部の被覆
は、上記手順により同様に構成されるが、各種テープ
は、直線部分と曲線部分とに分けて巻き付けなければな
らない。On the other hand, there is a cable connecting portion (here, T-shaped) having a branch portion as shown in FIG. 1 in which another cable is connected to the main cable. The coating of the branch connection is similarly configured by the above procedure, but the various tapes must be wound separately in a straight portion and a curved portion.
【０００６】図１のＴ字型では、３つの直線部分Ａ・Ｂ
・Ｃにそれぞれケーブルの長さ方向に各種テープを巻き
付けて一度テープを切り、３つの直線部分Ａ・Ｂ・Ｃの
結合部分である曲線部分Ｄに改めてテープを巻き付け
る。In the T-shape of FIG. 1, three straight portions A and B
C. Wrap each tape in the length direction of the cable around C, cut the tape once, and wind the tape again on the curved portion D which is a connection portion of the three straight portions A, B, and C.
【０００７】[0007]
【発明が解決しようとする課題】しかし、上記マイカテ
ープの巻き付けには、以下のような問題があった。 (1) 耐火用のマイカテープは、Si系のガラス質を主成
分としているため、伸縮性がほとんどなく、巻き付けに
くい。 マイカテープは、通常厚さが0.15〜0.85mmのテープであ
る。従って、耐火規定条件（30分間で840℃に到達する
ように加熱）を満たすには、一回の巻き付けでは充分で
ないため、耐火条件を満たすことが可能な厚さ（通常は
３mm程）になるように何回か巻き付けなければならな
い。しかし、0.15mm位の薄いものであれば、巻き易くは
なるが回数を多くしなければならず、手間がかかる。一
方、0.85mm位の厚いものであれば、回数は少なくて済む
が巻き付けにくく、またテープが割れる恐れがある。However, the winding of the mica tape has the following problems. (1) Since the mica tape for fire resistance is mainly composed of Si-based glass, it has little elasticity and is hard to wind. The mica tape is usually a tape having a thickness of 0.15 to 0.85 mm. Therefore, a single winding is not sufficient to satisfy the fire resistance conditions (heating to reach 840 ° C. in 30 minutes), and the thickness (usually about 3 mm) can satisfy the fire resistance conditions. Must be wound several times. However, if the thickness is as thin as about 0.15 mm, the winding becomes easy, but the number of times must be increased, which is troublesome. On the other hand, if the thickness is about 0.85 mm, the number of times is small, but it is difficult to wind the tape, and the tape may be broken.
【０００８】(2) 上記問題は、特に分岐接続部におい
て顕著である。 上記(1)の巻き付けにくさに加えて、分岐接続部では、
複数個の直線部分と直線結合部分とに分けて、その部分
別にテープを巻き付けなければならず、作業性が極端に
悪い。(2) The above problem is particularly remarkable in a branch connection portion. In addition to the difficult winding of (1) above, at the branch connection,
It is necessary to divide the tape into a plurality of straight portions and a straight connection portion and wind a tape for each portion, which is extremely poor in workability.
【０００９】(3) 耐火性能が安定しない。 上記テープの巻き付けは、通常、作業現場で行なわれる
ため、作業者の巻き付けスキルによって耐火性能にバラ
ツキが生じる。(3) Fire resistance performance is not stable. Since the winding of the tape is usually performed at a work site, the fire resistance varies depending on the winding skill of the operator.
【００１０】従って、本発明は、作業性が良く耐火性能
が均一な耐火ケーブル接続部を提供することを目的とす
る。また、本発明は、耐電圧性に優れた耐火ケーブル接
続部を提供することを目的とする。[0010] Accordingly, an object of the present invention is to provide a fire-resistant cable connecting portion having good workability and uniform fire resistance. Another object of the present invention is to provide a fire-resistant cable connection part having excellent withstand voltage.
【００１１】[0011]
【課題を解決するための手段】本発明は、予め導体接続
管に耐火被覆を一括形成しておくことで上記の目的を達
成する。即ち、本発明耐火ケーブル接続部は、突き合わ
せたケーブル導体同士をつなぐ導体接続管と、この接続
管の外周に形成された耐火被覆とを具える耐火ケーブル
接続部において、耐火被覆は、塗布、モールド、CVD（C
hemical Vapor Deposition）、PVD（Physical Vapor De
position）、加熱融着または溶射により形成されたこと
を特徴とする。また、本発明は、耐火被覆を継ぎ目のな
い連続した被覆としたことも特徴とする。According to the present invention, the above object is attained by forming a refractory coating on the conductor connection tube in advance. That is, the fireproof cable connection of the present invention comprises a conductor connection pipe connecting the butted cable conductors, and a fireproof cable connection formed on the outer circumference of the connection pipe. , CVD (C
Chemical Vapor Deposition), PVD (Physical Vapor Deposition)
position), formed by heat fusion or thermal spraying. The invention is also characterized in that the refractory coating is a continuous coating without any seams.
【００１２】本発明において導体接続管は、直線状のも
のはもちろん、分岐部分を有するものであっても良い。
なお、分岐構造には、いわゆるT分岐、Y分岐、X分岐な
どがある。In the present invention, the conductor connection pipe may have a branch portion as well as a straight one.
Note that the branch structure includes so-called T-branch, Y-branch, and X-branch.
【００１３】本発明において耐火被覆は、耐火性を具え
る無機材料よりなる層を有していることが好適である。
耐火被覆の材料としては、ケーブル接続部に要求される
耐火性に応じた無機材料を選択すれば良い。耐火性の一
例としては、30分間で840℃に到達する加熱という耐火
規定条件の他、いわゆる難燃性ケーブルに用いられる場
合は、上記耐火規定よりも低い温度条件であっても良
い。また、耐火被覆は、耐火性を具えるだけでなく耐電
圧性にも優れることが好ましい。具体的には、耐電圧性
を具える無機材料で、ケーブルにおける対地間電圧以上
に耐え得る所定の厚みに被覆すれば良い。このとき、耐
火被覆は、耐火性と耐電圧性とを具える無機材料よりな
る単層でも良いが、耐火性を具える無機材料よりなる層
と耐電圧性を具える無機材料よりなる層との積層構造で
も良い。In the present invention, the refractory coating preferably has a layer made of an inorganic material having fire resistance.
As the material for the fireproof coating, an inorganic material may be selected according to the fire resistance required for the cable connection portion. As an example of the fire resistance, in addition to the fire resistance specification condition of heating to reach 840 ° C. in 30 minutes, when it is used for a so-called flame-retardant cable, the temperature condition may be lower than the above fire resistance specification. Further, it is preferable that the refractory coating not only has fire resistance but also has excellent voltage resistance. Specifically, the cable may be coated with an inorganic material having a withstand voltage to a predetermined thickness which can withstand a voltage between a cable and a ground. At this time, the refractory coating may be a single layer made of an inorganic material having fire resistance and voltage resistance, but may be a layer made of an inorganic material having fire resistance and a layer made of an inorganic material having voltage resistance. May be used.
【００１４】ここで、30分間で840℃に到達する加熱と
いう高い耐火基準に対応するには、耐火被覆に一般に高
い耐熱性・絶縁性を有するセラミックを用いることが好
適である。セラミックの具体例としては、周期律表4a、
5a、6a族元素、即ちTi・Zr・Hf・V・Nb・Ta・Cr・Mo・W
の炭化物、窒化物、炭窒化物、硼化物、および酸化物、
Alの窒化物、硼化物および酸化物よりなる群から選択さ
れた少なくとも1種が望ましい。特に、通電時の発熱に
伴う導体の膨張によっても容易に剥離しない材料が好適
で、線膨張係数ができるだけ導体接続管の材料に近いも
のが好ましい。Here, in order to meet the high fire resistance standard of heating to reach 840 ° C. in 30 minutes, it is preferable to use a ceramic having generally high heat resistance and insulation for the fire-resistant coating. Specific examples of ceramics include Periodic Table 4a,
5a, 6a group element, that is, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W
Carbides, nitrides, carbonitrides, borides, and oxides of
Desirable is at least one selected from the group consisting of nitrides, borides and oxides of Al. In particular, a material that does not easily peel off even when the conductor expands due to heat generation during energization is preferable, and a material having a linear expansion coefficient as close as possible to the material of the conductor connection pipe is preferable.
【００１５】本発明において耐火被覆は、耐火性・耐電
圧性の条件に応じて適宜無機材料を選択すれば良く、単
層でも複数層の積層構造でも良い。具体的に単層として
は、特に耐電圧性に優れるアルミナからなるものが好適
である。また、別の単層としては、特に耐熱性に優れる
ジルコニアからなるものも好適である。一方、複数層と
しては、例えば、導体接続管との線膨張係数の差が小さ
い無機材料を導体接続管直上に被覆し、その上に導体接
続管との線膨張係数の差が大きい無機材料を順に被覆す
るという積層構造とすることが好適である。この複数層
よりなる耐火被覆は、積層構造により線膨張係数の変化
を段階的にし、その剥離を抑制することが可能である。
このような耐火被覆は、耐熱性に富むジルコニアよりな
る層と耐電圧性に富むアルミナよりなる層との積層構造
であることが最適である。なお、例えば導体接続管が銅
製の場合、一般に同一温度においてジルコニアの線膨張
係数は、アルミナよりも銅に近いのでジルコニアよりな
る層を導体接続管直上に被覆すると良い。このとき、ジ
ルコニアは、アルミナに対してクッションとしての役割
も果たす。なお、25℃前後において銅の線膨張係数は約
16.2×10−６／Ｋ、ジルコニアは約10.59×10−６／
Ｋ、アルミナは約7.58×10−６／Ｋ程である。In the present invention, the refractory coating may be selected from inorganic materials as appropriate according to the conditions of the fire resistance and the withstand voltage, and may be a single layer or a multi-layer structure. Specifically, as the single layer, a layer made of alumina which is particularly excellent in withstand voltage is preferable. Further, as another single layer, a layer made of zirconia having particularly excellent heat resistance is also suitable. On the other hand, as the plurality of layers, for example, an inorganic material having a small difference in linear expansion coefficient from the conductor connection pipe is coated just above the conductor connection pipe, and an inorganic material having a large difference in linear expansion coefficient from the conductor connection pipe is coated thereon. It is preferable to adopt a laminated structure in which coating is performed in order. The refractory coating composed of a plurality of layers makes it possible to gradually change the coefficient of linear expansion due to the laminated structure and suppress the peeling.
Most preferably, such a refractory coating has a laminated structure of a layer made of zirconia having high heat resistance and a layer made of alumina having high voltage resistance. In addition, for example, when the conductor connection pipe is made of copper, the linear expansion coefficient of zirconia is generally closer to copper than alumina at the same temperature, so that a layer made of zirconia may be coated directly on the conductor connection pipe. At this time, zirconia also serves as a cushion for alumina. At around 25 ° C, the coefficient of linear expansion of copper is about
16.2 × 10 −6 / K, zirconia is about 10.59 × 10 −6 / K
K and alumina are about 7.58 × 10 −6 / K.
【００１６】一方、30分間で840℃に到達する加熱とい
う耐火基準よりも低くて良い場合、無機材料よりなる被
覆でも良いがその他の例としては、フッ素系樹脂・ゴム
の被覆が考えられる。フッ素系樹脂には、例えばポリテ
トラフルオルエチレンが挙げられる。その他、耐火基準
の低いものでは、例えばシリコン系樹脂・ゴムの被覆で
良い場合も考えられる。On the other hand, if the temperature is lower than the refractory standard of heating to reach 840 ° C. in 30 minutes, a coating made of an inorganic material may be used. As another example, a coating made of a fluororesin or rubber is considered. Examples of the fluorine-based resin include polytetrafluoroethylene. In addition, in the case of a material having a low fire resistance standard, for example, a case in which coating with a silicon-based resin or rubber may be sufficient.
【００１７】耐火被覆の形成方法は、耐火塗料の塗布や
耐火樹脂・ゴムのモールドが挙げられる。その他、プラ
ズマCVDなどのCVD法や、真空蒸着法、スパッタ蒸着法、
イオンプレーティングなどのPVD法の他、溶射により行
う。特に、セラミック材料の被覆には、CVD法、PVD法、
溶射が好適である。また、セラミック質を含むほうろう
上薬を導体接続管に塗布して加熱融着させるほうろう仕
上げにより被覆を行っても良い。The method of forming the refractory coating includes application of a refractory paint or molding of a refractory resin or rubber. In addition, CVD methods such as plasma CVD, vacuum deposition methods, sputter deposition methods,
In addition to the PVD method such as ion plating, it is performed by thermal spraying. In particular, for coating of ceramic materials, CVD method, PVD method,
Thermal spraying is preferred. Further, the enamel coating containing ceramic material may be applied to the conductor connection tube and coated by enamel finish which is heated and fused.
【００１８】なお、耐火被覆の被覆個所である導体接続
管の外周とは、導体接続管の外周面の直上だけでなく、
介在層を有するものも含む。この介在層は、線膨張係数
が導体接続管と近いものが好ましく、このとき、クッシ
ョンとしての役割を果たす。また、導体接続管の外周面
の直上に被覆する場合、被覆個所は、導体接続管のうち
導体との接続のために圧縮または圧着される部分を除く
全ての範囲とする。この圧縮または圧着部を除くのは、
耐火被覆を形成しても圧縮または圧着時の変形により耐
火被覆が剥離するからである。The outer periphery of the conductor connection pipe, which is a portion where the refractory coating is applied, means not only immediately above the outer peripheral surface of the conductor connection pipe, but also
Also includes those having an intervening layer. The intervening layer preferably has a coefficient of linear expansion close to that of the conductor connection tube, and at this time, plays a role as a cushion. In the case of covering directly above the outer peripheral surface of the conductor connection tube, the covering portion is set to the entire range except the portion of the conductor connection tube that is compressed or crimped for connection with the conductor. Excluding this compression or crimping part
This is because even when the refractory coating is formed, the refractory coating is peeled off due to deformation during compression or pressure bonding.
【００１９】本発明は、このような耐火被覆を予め導体
接続管の外周に形成しておくことで、作業現場において
ケーブル接続部に耐火被覆を施す必要がない。即ち、本
発明において耐火被覆は、工場での品質統一が可能なた
め、耐火性能のばらつきを極力小さく抑えることができ
る。特に、本発明は、ケーブル接続部の分岐部分におい
て困難であった伸縮性の乏しいマイカテープの巻き付け
作業が不要となり、作業現場におけるケーブル接続部の
形成の作業性を格段に改善することができる。According to the present invention, by forming such a fireproof coating on the outer periphery of the conductor connection pipe in advance, it is not necessary to apply the fireproof coating to the cable connection portion at the work site. That is, in the present invention, since the quality of the refractory coating can be unified at the factory, the variation in the refractory performance can be suppressed as small as possible. In particular, the present invention eliminates the necessity of winding the mica tape having poor elasticity, which has been difficult at the branch portion of the cable connection portion, and can significantly improve the workability of forming the cable connection portion at the work site.
【００２０】[0020]
【発明の実施の形態】以下、本発明の実施の形態を説明
する。 （実施例１） ＜全体構成＞図１は、本発明耐火ケーブル接続部20にお
いて、耐火被覆を具える導体接続管を用いたＴ字分岐接
続部の断面図、図２は、同接続部の導体接続部付近の拡
大図である。なお、図1において無機物10の被覆、ゴム1
1のモールドが示されていないが、図２の拡大図のよう
に施されている。本発明耐火ケーブル接続部20は、ケー
ブル端部の各被覆を段剥ぎして露出させた撚線導体１を
接続する圧縮型導体接続管２の外周に、接続管２の外周
面を中心として耐火・絶縁を目的とした保護被覆を施し
た構成である。なお、本例では、6600Ｖ用のケーブルを
用いた。Embodiments of the present invention will be described below. (First Embodiment) <Overall Configuration> FIG. 1 is a cross-sectional view of a T-shaped branch connection portion using a conductor connection tube provided with a fire-resistant coating in a fire-resistant cable connection portion 20 of the present invention, and FIG. It is an enlarged view near a conductor connection part. In FIG. 1, the coating of the inorganic substance 10 and the rubber 1
Although one mold is not shown, it is applied as shown in the enlarged view of FIG. The fire-resistant cable connecting part 20 of the present invention is provided with a fire-resistant cable around the outer peripheral surface of the connecting pipe 2 on the outer circumference of the compression-type conductor connecting pipe 2 for connecting the stranded conductor 1 exposed by stripping the respective coatings of the cable end. -It has a configuration with a protective coating for insulation. In this example, a cable for 6600 V was used.
【００２１】＜各被覆の構成と形成手順＞次に、各被覆
の構成と形成手順について図１で示すＴ字分岐接続部を
用いて説明する。本発明耐火ケーブル接続部20は、以下
の番号順に従って、撚線導体１の外周面に内周から重ね
て被覆される。 (1) 予め無機物10を溶射した圧縮型導体接続管２を用
意する。このとき、撚線導体１同士の接続のために圧縮
される接続管２の各端部は、無機物10を被覆しない。無
機物10は、耐火性・絶縁性のあるものであれば良い。ま
た、無機物10の被覆は、単層でも複数層の積層構造でも
良い。本例では、無機物10としてアルミナよりなる単層
とした。また、接続管２の外周面に施す無機物10の被覆
の厚みは、２mm以下が好ましい。本例では、1.5mmとし
た。なお、接続管２は、圧縮される両端部が中空のパイ
プ状であり、残りの本体が中実の柱状である。また、接
続管２は、撚線導体１が銅の場合、銅または銅合金が好
ましい。本例において撚線導体１・接続管２は、共に銅
製のものを用いた。なお、後述の実施例２・３の撚線導
体１・接続管２も銅製のものを用いた。<Structure and Formation Procedure of Each Coating> Next, the structure and formation procedure of each coating will be described with reference to a T-shaped branch connection portion shown in FIG. The refractory cable connecting portion 20 of the present invention is covered on the outer peripheral surface of the stranded conductor 1 from the inner periphery in accordance with the following numerical order. (1) A compression-type conductor connection pipe 2 on which an inorganic substance 10 has been sprayed in advance is prepared. At this time, each end of the connection pipe 2 compressed for connection between the stranded conductors 1 does not cover the inorganic substance 10. The inorganic substance 10 only needs to have fire resistance and insulation properties. Further, the coating of the inorganic substance 10 may have a single-layer structure or a multi-layer structure. In this example, the inorganic material 10 was a single layer made of alumina. The thickness of the coating of the inorganic substance 10 applied to the outer peripheral surface of the connection pipe 2 is preferably 2 mm or less. In this example, it was 1.5 mm. The connecting pipe 2 has a hollow pipe shape at both ends to be compressed, and has a solid main body with the remaining main body. When the stranded conductor 1 is made of copper, the connection pipe 2 is preferably made of copper or a copper alloy. In this example, both the stranded conductor 1 and the connection pipe 2 were made of copper. The stranded wire conductors 1 and connection pipes 2 of Examples 2 and 3 described later were also made of copper.
【００２２】(2) 接続管２の各端部（無機物10が溶射
されていない部分付近）を除いてその外周面をゴム11で
覆う。これは、絶縁を目的とするもであり、材質は絶縁
性のあるゴムであれば良い。本発明において、ここまで
の工程は、工場内などで行えるため、性能が均一な耐火
ケーブル接続部20を提供できる。(2) The outer peripheral surface of the connection pipe 2 is covered with the rubber 11 except for each end (near the portion where the inorganic substance 10 is not sprayed). This is for the purpose of insulation, and the material may be rubber having insulation properties. In the present invention, the steps so far can be performed in a factory or the like, so that the fire-resistant cable connection portion 20 having uniform performance can be provided.
【００２３】以下の工程は、作業現場において行われ
る。 (3) 切断されたケーブル端部から各被覆を段剥ぎし
て、撚線導体１を露出させる。ケーブル端部は、段剥ぎ
により順に撚線導体１・耐火層12・ケーブル絶縁体13・
半導電層14・遮蔽銅テープ15・耐火保護層16・ケーブル
シース17の各被覆が露出している。The following steps are performed at the work site. (3) Strip each coating from the cut end of the cable to expose the stranded conductor 1. The end of the cable is stripped in order by twisting conductor 1, fireproof layer 12, cable insulator 13,
Each coating of the semiconductive layer 14, the shielding copper tape 15, the fireproof protective layer 16, and the cable sheath 17 is exposed.
【００２４】(4) 無機物10を溶射した接続管２の各端
部に、露出させた３本の撚線導体１の端部を挿入し、接
続管２の各端部を圧縮させて撚線導体１を接続管２に接
続する。(4) Insert the exposed ends of the three stranded conductors 1 into each end of the connection pipe 2 on which the inorganic substance 10 has been sprayed, and compress each end of the connection pipe 2 to form a stranded wire. The conductor 1 is connected to the connection pipe 2.
【００２５】ここで、無機物10の溶射・ゴム11のモール
ドを施さない接続管２の各端部付近の被覆は、以下のよ
うに各種テープを巻き付けることによって行なう。接続
管２とマイカテープを巻き付けた耐火層12の端部との隙
間に露出している撚線導体１には、ブチルゴムを主成分
とする自己融着絶縁テープ４を巻き付ける。このとき、
耐火層12から接続管２の方向に、接続管２と耐火層12と
の間に極端な段差が生じないようにする。それから、撚
線導体１と巻き付けたテープ４との外周面と接続管２の
端部とに、耐火層12から接続管２に溶射した無機物10・
ゴム11に向かってマイカテープ３を巻き付ける。次に、
マイカテープ３を巻き付けた接続管２の端部にケーブル
絶縁体13からゴム11に向かって自己融着絶縁テープ４を
巻き付ける。このとき、絶縁テープ４は、ゴム11の厚み
と均一になるように巻き付ける。Here, the coating of the vicinity of each end of the connection pipe 2 where the thermal spraying of the inorganic substance 10 and the molding of the rubber 11 are not performed is performed by winding various tapes as follows. A self-fusing insulating tape 4 containing butyl rubber as a main component is wound around the stranded conductor 1 exposed in a gap between the connection pipe 2 and the end of the fireproof layer 12 around which the mica tape is wound. At this time,
In the direction from the refractory layer 12 to the connecting pipe 2, no extreme step is formed between the connecting pipe 2 and the refractory layer 12. Then, on the outer peripheral surface of the stranded conductor 1 and the wrapped tape 4 and the end of the connecting pipe 2, the inorganic material 10 sprayed from the refractory layer 12 onto the connecting pipe 2.
The mica tape 3 is wound around the rubber 11. next,
A self-sealing insulating tape 4 is wound around the end of the connection pipe 2 around which the mica tape 3 is wound from the cable insulator 13 toward the rubber 11. At this time, the insulating tape 4 is wound around the rubber 11 so as to have a uniform thickness.
【００２６】以下の工程は、直線部分Ａ・Ｂ・Ｃと直線
部分の結合部分(曲線部分)Ｄとに分けて行う。このと
き、直線部分Ａ・Ｂ・Ｃの被覆を行ってから曲線部分Ｄ
を行うという手順である。直線部分の被覆開始点は、段
剥ぎによって露出された各被覆(層)であり、被覆終了点
は、曲線部分Ｄにかかる部分である。これらの被覆は、
全体として各被覆層までの間に施す。なお、被覆方向
は、ケーブルの長さ方向である。 (5) 接続管２上のゴム11の外周面を含めて半導電層14
から半導電性テープ５を巻き付ける。 (6) 遮蔽銅テープ15から半導電性テープ５の外周面に
銅線６を螺旋状に巻き付ける。 (7) 半導電性テープ５かつ銅線６の外周面を含めて耐
火保護層16から耐火テープ７を巻き付ける。なお、本例
において耐火テープは、発泡性のものを用いた。 (8) 耐火テープ７の外周面を含めてケーブルシース17
から自己融着絶縁テープ４を巻き付ける。 (9) 絶縁テープ４の外周面にクロロプレンを主成分と
する防水テープ８を巻き付ける。 (10) 防水テープ８の外周面にポリ塩化ビニルを主成分
とする保護テープ９を巻き付ける。The following steps are performed separately for the straight line portions A, B and C and the joint portion (curved portion) D of the straight line portions. At this time, after covering the linear portions A, B, and C, the curved portion D
It is the procedure of doing. The coating start point of the straight line portion is each coating (layer) exposed by the stripping, and the coating end point is a portion covering the curved portion D. These coatings
It is applied between each coating layer as a whole. The covering direction is the length direction of the cable. (5) The semiconductive layer 14 including the outer peripheral surface of the rubber 11 on the connecting pipe 2
Is wound around the semi-conductive tape 5. (6) A copper wire 6 is spirally wound from the shielding copper tape 15 to the outer peripheral surface of the semiconductive tape 5. (7) Wind the fire-resistant tape 7 from the fire-resistant protective layer 16 including the semiconductive tape 5 and the outer peripheral surface of the copper wire 6. In this example, a foaming tape was used as the fire-resistant tape. (8) The cable sheath 17 including the outer peripheral surface of the fireproof tape 7
Self-fusing insulating tape 4 is wound. (9) Wrap a waterproof tape 8 containing chloroprene as a main component around the outer peripheral surface of the insulating tape 4. (10) A protective tape 9 mainly composed of polyvinyl chloride is wound around the outer peripheral surface of the waterproof tape 8.
【００２７】上記の工程により、本例では、ケーブル接
続部において接続管２の外周面にアルミナ被覆を具える
耐火ケーブル接続部20を得られる。なお、耐火ケーブル
接続部20は、予め接続管２に無機物10の溶射とゴム11の
モールドとを工場で行ったため、作業現場での被覆作業
時間を短縮することができた。Through the above steps, in this example, a fire-resistant cable connection portion 20 having an alumina coating on the outer peripheral surface of the connection pipe 2 at the cable connection portion can be obtained. In addition, since the spraying of the inorganic substance 10 and the molding of the rubber 11 were performed on the connection pipe 2 in advance at the factory, the coating work time at the work site could be shortened.
【００２８】（試験例１）本発明耐火ケーブル接続部20
において、無機物（アルミナ）10を溶射した接続管２の
耐火性と耐電圧性とを調べてみた。耐火性の条件は、30
分間で840℃に到達するような加熱とした。また、耐電
圧性は、耐火試験後の破壊電圧を測定した。なお、耐火
性を具えるとは、耐火試験における加熱後、アルミナ10
よりなる層に亀裂が生じたり、剥離しないこととする。
また、破壊電圧とは、無機物10よりなる層に亀裂が生じ
始めたときの電圧とする。これらは、以下の試験例２・
３において同様とする。(Test Example 1) The fire-resistant cable connecting portion 20 of the present invention
, The fire resistance and the withstand voltage of the connection pipe 2 sprayed with the inorganic substance (alumina) 10 were examined. The fire resistance condition is 30
Heated to reach 840 ° C in minutes. The withstand voltage was determined by measuring the breakdown voltage after the fire test. Note that having fire resistance means that after heating in a fire resistance test, alumina 10
It is assumed that cracks do not occur in the layer made of, or peel off.
In addition, the breakdown voltage is a voltage at which cracking starts to occur in the layer made of the inorganic substance 10. These are described in Test Example 2 below.
3 is the same.
【００２９】試験の結果、アルミナ10を溶射した接続管
２は、30分間で840℃に到達する加熱という耐火規定条
件を満たした。また、アルミナ10を溶射した接続管２
は、ケーブル使用温度範囲内のヒートサイクルによって
も導体接続管から耐火被覆が剥離する・亀裂が入るなど
したものがほとんど見られなかった。一方、アルミナ10
を溶射した接続管２は、対地間電圧（交流三相三線式の
場合、線間電圧の１／√３）3810V以上の耐電圧性を有
していることも確認できた。本試験により、アルミナ10
を溶射した接続管２にゴム11のモールドを施した耐火ケ
ーブル接続部20は、上記耐火規定条件を満たすことと耐
電圧性を有することとが分かる。As a result of the test, the connection pipe 2 on which the alumina 10 was sprayed satisfied the specified fire resistance condition that heating reached 840 ° C. in 30 minutes. A connection pipe 2 sprayed with alumina 10
In the test, almost no fireproof coating was peeled off or cracked from the conductor connection pipe even by a heat cycle within the cable operating temperature range. On the other hand, alumina 10
Was confirmed to have a withstand voltage of 3810 V or more (ground voltage (1 / √3 of the line voltage in the case of an AC three-phase three-wire system)). This test shows that alumina 10
It can be seen that the fire-resistant cable connecting portion 20 in which the rubber 11 is molded on the connection pipe 2 sprayed with the satisfies the above-mentioned fire-resistant specified condition and has the withstand voltage.
【００３０】(実施例２)実施例１の耐火ケーブル接続部
20は、Ｔ字分岐の圧縮型導体接続管２を用いたものであ
ったが、Ｙ字分岐の圧縮型導体接続管２を用いた耐火ケ
ーブル接続部30を図３に示す。この耐火ケーブル接続部
30は、実施例１の耐火ケーブル接続部20と基本的構成・
機能とも共通しており、相違点は分岐部分の形のみであ
る。なお、図３において無機物10の被覆が示されていな
いが、図２の拡大図のように施されている。本例おいて
無機物10の被覆は、ジルコニアよりなる単層（厚さ1.5m
m）とし、耐火ケーブル接続部30は、ジルコニア10の被
覆を施した接続管２を用いて上記実施例１で示した手順
により形成した。(Embodiment 2) The connection part of the fireproof cable of Embodiment 1
20 uses the T-branch compression-type conductor connection tube 2, but FIG. 3 shows a fire-resistant cable connection portion 30 using the Y-branch compression-type conductor connection tube 2. This fireproof cable connection
Reference numeral 30 denotes the basic structure of the fire-resistant cable connecting portion 20 of the first embodiment.
The function is common, and the only difference is the shape of the branch portion. Although the coating of the inorganic substance 10 is not shown in FIG. 3, it is applied as shown in the enlarged view of FIG. In this example, the coating of the inorganic substance 10 is a single layer of zirconia (thickness of 1.5 m).
m), and the refractory cable connecting portion 30 was formed by the procedure shown in the above-mentioned Example 1 using the connecting pipe 2 coated with the zirconia 10.
【００３１】（試験例２）本発明耐火ケーブル接続部30
において、無機物（ジルコニア）10を溶射した接続管２
の耐火性と耐電圧性とを調べてみた。耐火性の条件は、
840℃に急加熱してこれを30分間保持させる加熱とし
た。また、耐電圧性は、試験例１と同様に耐火試験後の
破壊電圧を測定した。試験の結果、ジルコニア10を溶射
した接続管２は、840℃で30分間に到達する加熱という
試験例１よりも厳しい耐火規定条件を満たした。また、
ジルコニア10を溶射した接続管２は、ケーブル使用温度
範囲内のヒートサイクルによっても導体接続管２から耐
火被覆が剥離する・亀裂が入るなどしなかった。従っ
て、ジルコニア10を溶射した接続管２は、優れた耐火性
・耐熱性を具えることが確認できた。一方、ジルコニア
10を溶射した接続管２は、対地間電圧2000V程度の耐電
圧性を有していることが確認できた。本試験により、ジ
ルコニア10を溶射した接続管２にゴム11のモールドを施
した耐火ケーブル接続部30は、上記耐火規定条件を満た
すことと耐電圧性を有することとが分かる。また、耐火
ケーブル接続部30は、6600Vよりも低い電圧において使
用できることが分かる。(Test Example 2) Fire-resistant cable connecting portion 30 of the present invention
Connection pipe 2 sprayed with inorganic material (zirconia) 10
The fire resistance and the withstand voltage of the steel were examined. The fire resistance condition is
This was heated to 840 ° C. and held for 30 minutes. As for the withstand voltage, the breakdown voltage after the fire test was measured in the same manner as in Test Example 1. As a result of the test, the connection pipe 2 sprayed with zirconia 10 satisfied the stricter fire resistance condition than the test example 1 in which heating was performed at 840 ° C. for 30 minutes. Also,
The connection pipe 2 sprayed with zirconia 10 did not peel off or crack in the refractory coating from the conductor connection pipe 2 even by a heat cycle within the cable operating temperature range. Accordingly, it was confirmed that the connection pipe 2 sprayed with the zirconia 10 had excellent fire resistance and heat resistance. Meanwhile, zirconia
It was confirmed that the connection pipe 2 sprayed with 10 had a withstand voltage of about 2000 V to ground. From this test, it can be seen that the fire-resistant cable connecting portion 30 in which the rubber 11 is molded on the connection pipe 2 sprayed with the zirconia 10 satisfies the above-mentioned fire-resistant specified conditions and has a withstand voltage. It can also be seen that the refractory cable connection 30 can be used at voltages lower than 6600V.
【００３２】(実施例３)実施例１・２は、Ｔ字・Ｙ字分
岐の圧縮型導体接続管２を用いたものであったが、Ｘ字
分岐の圧縮型導体接続管２を用いた耐火ケーブル接続部
40を図４に示す。この耐火ケーブル接続部40は、実施例
１・２の耐火ケーブル接続部20・30と基本的構成・機能
とも共通しており、相違点は分岐部分の形のみである。
なお、図４において無機物10の被覆が示されていない
が、図２の拡大図のように施されている。(Embodiment 3) In Embodiments 1 and 2, the T-shaped and Y-branched compression-type conductor connection pipes 2 are used. However, the X-branch compression-type conductor connection pipes 2 are used. Fireproof cable connection
40 is shown in FIG. The fire-resistant cable connecting portion 40 has the same basic configuration and functions as the fire-resistant cable connecting portions 20 and 30 of the first and second embodiments, and the only difference is the shape of the branch portion.
Although the coating of the inorganic substance 10 is not shown in FIG. 4, it is applied as shown in the enlarged view of FIG.
【００３３】本例において無機物10の被覆は、ジルコニ
アよりなる層とアルミナよりなる層とを積層とし、耐火
ケーブル接続部40は、この積層による耐火被覆を施した
接続管２を用いて上記実施例１で示した手順により形成
した。上記耐火被覆は、線膨張係数が銅と近いジルコニ
アよりなる層を接続管２の外周面に被覆し、その外周に
アルミナよりなる層を積層した構成である。なお、積層
した被覆の厚みは、ジルコニアよりなる層を1.0mm、ア
ルミナよりなる層を0.4mmの合計で1.4mmとした。In this embodiment, the coating of the inorganic substance 10 is formed by laminating a layer made of zirconia and a layer made of alumina, and the fire-resistant cable connecting portion 40 is formed by using the connection pipe 2 provided with the fire-resistant coating by this lamination. 1 was formed by the procedure shown in FIG. The refractory coating has a configuration in which a layer made of zirconia having a linear expansion coefficient close to that of copper is coated on the outer peripheral surface of the connection pipe 2, and a layer made of alumina is laminated on the outer periphery. In addition, the thickness of the laminated coating was 1.4 mm for a total of 1.0 mm for the layer made of zirconia and 0.4 mm for the layer made of alumina.
【００３４】（試験例３）本発明耐火ケーブル接続部40
において、無機物（ジルコニア・アルミナ）10を溶射し
た接続管２の耐火性と耐電圧性とを調べてみた。耐火性
の条件は、試験例２と同様とした。また、耐電圧性は、
試験例１と同様に耐火試験後の破壊電圧を測定した。試
験の結果、ジルコニア・アルミナ10を溶射した接続管２
は、840℃で30分間に到達する加熱という試験例１より
も厳しい耐火規定条件を満たした。また、ジルコニア・
アルミナ10を溶射した接続管２は、ケーブル使用温度範
囲内のヒートサイクルによっても導体接続管２から耐火
被覆が剥離する・亀裂が入るなどしなかった。従って、
ジルコニア・アルミナ10を溶射した接続管２は、優れた
耐火性・耐熱性を具えることが確認できた。一方、ジル
コニア・アルミナ10を溶射した接続管２は、対地間電圧
3810V以上という優れた耐電圧性を有していることが確
認できた。本試験により、ジルコニア・アルミナ10を溶
射した接続管２にゴム11のモールドを施した耐火ケーブ
ル接続部40は、上記耐火規定条件を満たすことと耐電圧
性を有することとが分かる。また、耐火ケーブル接続部
40は、6600V用のケーブルに充分使用できることが分か
る。(Test Example 3) Fireproof cable connecting portion 40 of the present invention
, The fire resistance and the voltage resistance of the connection pipe 2 sprayed with the inorganic substance (zirconia-alumina) 10 were examined. The fire resistance conditions were the same as in Test Example 2. The withstand voltage is
The breakdown voltage after the fire resistance test was measured in the same manner as in Test Example 1. As a result of the test, connection pipe 2 sprayed with zirconia-alumina 10
Satisfies the stricter fire resistance requirements than Test Example 1 in which heating reaches 840 ° C. for 30 minutes. In addition, zirconia
The connection pipe 2 sprayed with the alumina 10 did not peel off or cracked the refractory coating from the conductor connection pipe 2 even by a heat cycle within the cable operating temperature range. Therefore,
It was confirmed that the connection pipe 2 sprayed with zirconia-alumina 10 had excellent fire resistance and heat resistance. On the other hand, the connection pipe 2 sprayed with zirconia-alumina 10
It was confirmed that it had an excellent withstand voltage of 3810 V or more. From this test, it is understood that the fire-resistant cable connection portion 40 in which the rubber 11 is molded on the connection pipe 2 sprayed with the zirconia-alumina 10 satisfies the above-mentioned fire-resistant specified condition and has the withstand voltage property. In addition, fireproof cable connection
It turns out that 40 can be used enough for a cable for 6600V.
【００３５】[0035]
【発明の効果】以上説明したように本発明耐火ケーブル
接続部によれば、(1)作業性の向上(2)均一な耐火性能を
有する導体接続管の提供(3)対地間電圧以上の絶縁性能
を有する耐火被覆という効果が挙げられる。また、無機
物の溶射などによる被覆は、従来のテープよりも厚さを
薄くできるので、ケーブル接続部の縮小化が可能であ
る。As described above, according to the fire-resistant cable connecting portion of the present invention, (1) improvement in workability (2) provision of a conductor connection pipe having uniform fire resistance performance (3) insulation above a voltage between ground and ground There is an effect of a fireproof coating having a performance. In addition, the thickness of the coating by thermal spraying of an inorganic substance can be made smaller than that of a conventional tape, so that the cable connection portion can be reduced in size.
【図１】本発明耐火ケーブル接続部において、耐火被覆
を具えるＴ字分岐接続部の断面図である。FIG. 1 is a cross-sectional view of a T-shaped branch connection portion provided with a fire-resistant coating in a fire-resistant cable connection portion of the present invention.
【図２】本発明耐火ケーブル接続部において、耐火被覆
を具える接続部端部付近の拡大図である。FIG. 2 is an enlarged view of the vicinity of an end of a connection portion provided with a fireproof coating in a connection portion of a fireproof cable according to the present invention.
【図３】本発明耐火ケーブル接続部において、耐火被覆
を具えるＹ字分岐接続部の断面図である。FIG. 3 is a cross-sectional view of a Y-branch connection portion provided with a fire-resistant coating in the fire-resistant cable connection portion of the present invention.
【図４】本発明耐火ケーブル接続部において、耐火被覆
を具えるＸ字分岐接続部の断面図である。FIG. 4 is a cross-sectional view of an X-shaped branch connection part provided with a fireproof coating in the fire-resistant cable connection part of the present invention.
【図５】従来の耐火ケーブル接続部において、マイカテ
ープによる耐火被覆を具える直線型接続部の断面図であ
る。FIG. 5 is a cross-sectional view of a straight-line connection portion provided with a fire-resistant coating with mica tape in a conventional fire-resistant cable connection portion.
１ 撚線導体 ２ 圧縮型導体接続管 ３ マイカテー
プ ４ 自己融着絶縁テープ ５ 半導電性テープ ６ 銅
線 ７ 耐火テープ ８ 防水テープ ９ 保護テープ 10 無機物 11 ゴ
ムモールド 12 耐火層 13 ケーブル絶縁体 14 半導電層 15
遮蔽銅テープ 16 耐火保護層 17 ケーブルシース 20・30・40 耐火ケーブル接続部 Ａ・Ｂ・Ｃ ケーブル接続部の直線部分 Ｄ ケーブル
接続部分の曲線部分DESCRIPTION OF SYMBOLS 1 Stranded-wire conductor 2 Compression-type conductor connection pipe 3 Mica tape 4 Self-fusing insulating tape 5 Semi-conductive tape 6 Copper wire 7 Fireproof tape 8 Waterproof tape 9 Protective tape 10 Inorganic substance 11 Rubber mold 12 Fireproof layer 13 Cable insulator 14 Half Conductive layer 15
Shielded copper tape 16 Fireproof protective layer 17 Cable sheath 20/30/40 Fireproof cable connection A / B / C Straight part of cable connection D Curved part of cable connection
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２３Ｃ 16/40 Ｃ２３Ｃ 16/40 (72)発明者 齊藤 秀樹 兵庫県伊丹市北河原当田20番地の２ 住電 朝日精工株式会社内 (72)発明者 柏村 謙司 兵庫県伊丹市北河原当田20番地の２ 住電 朝日精工株式会社内──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C23C 16/40 C23C 16/40 (72) Inventor Hideki Saito 20-20 Toda, Kitagawara, Itami-shi, Hyogo Sumitomo Asahi Seiko Co., Ltd. (72) Inventor Kenji Kashiwamura 20-20 Kitagawara Toda, Itami City, Hyogo Prefecture Sumitomo Asahi Seiko Co., Ltd.
Claims (9)
導体接続管と、この接続管の外周に形成された耐火被覆
とを具える耐火ケーブル接続部において、 前記耐火被覆は、塗布、モールド、CVD、PVD、加熱融着
または溶射により形成されたことを特徴とする耐火ケー
ブル接続部。1. A fire-resistant cable connecting portion comprising a conductor connecting pipe for connecting butted cable conductors, and a fire-resistant coating formed on an outer periphery of the connecting pipe, wherein the fire-resistant coating is coated, molded, CVD, PVD A refractory cable connection formed by heat fusion or thermal spraying.
導体接続管と、この接続管の外周に形成された耐火被覆
とを具える耐火ケーブル接続部において、 前記耐火被覆は、継ぎ目のない連続した被覆であること
を特徴とする耐火ケーブル接続部。2. A fireproof cable connecting portion comprising a conductor connecting pipe for connecting butted cable conductors, and a fireproof coating formed on an outer periphery of the connecting pipe, wherein the fireproof coating is a seamless continuous coating. A fire-resistant cable connection, characterized in that there is.
特徴とする請求項１または２記載の耐火ケーブル接続
部。3. The fire-resistant cable connecting section according to claim 1, wherein the conductor connecting pipe has a branch portion.
る無機材料よりなる層を有することを特徴とする請求項
１または２記載の耐火ケーブル接続部。4. The fire-resistant cable connection according to claim 1, wherein the fire-resistant coating has a layer made of an inorganic material having fire resistance and voltage resistance.
りなる層と耐電圧性を具える無機材料よりなる層との積
層構造であることを特徴とする請求項４記載の耐火ケー
ブル接続部。5. The fire-resistant cable connection according to claim 4, wherein the fire-resistant coating has a laminated structure of a layer made of an inorganic material having fire resistance and a layer made of an inorganic material having voltage resistance. Department.
の炭化物、窒化物、炭窒化物、硼化物、および酸化物、
Alの窒化物、硼化物および酸化物よりなる群から選択さ
れた少なくとも1種よりなることを特徴とする請求項４
または５記載の耐火ケーブル接続部。6. The inorganic material includes a carbide, nitride, carbonitride, boride, and oxide of a Group 4a, 5a, or 6a element of the periodic table.
5. The method according to claim 4, comprising at least one selected from the group consisting of nitrides, borides and oxides of Al.
Or the fire-resistant cable connection according to 5.
ることを特徴とする請求項４記載の耐火ケーブル接続
部。7. The fire-resistant cable connection according to claim 4, wherein the fire-resistant coating has a layer made of alumina.
することを特徴とする請求項４記載の耐火ケーブル接続
部。8. The fire-resistant cable connection according to claim 4, wherein the fire-resistant coating has a layer made of zirconia.
コニアよりなる層との積層構造であることを特徴とする
請求項５記載の耐火ケーブル接続部。9. The connection section according to claim 5, wherein the refractory coating has a laminated structure of a layer made of alumina and a layer made of zirconia.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000089838A JP2000350347A (en) | 1999-03-31 | 2000-03-28 | Splice of fire-proof cable |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9193799 | 1999-03-31 | ||
| JP11-91937 | 1999-03-31 | ||
| JP2000089838A JP2000350347A (en) | 1999-03-31 | 2000-03-28 | Splice of fire-proof cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000350347A true JP2000350347A (en) | 2000-12-15 |
Family
ID=26433370
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000089838A Pending JP2000350347A (en) | 1999-03-31 | 2000-03-28 | Splice of fire-proof cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000350347A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7339115B2 (en) | 2005-07-15 | 2008-03-04 | Rockbestos Surprenant Cable Corp | Fire resistant electrical cable splice |
| JP2018196207A (en) * | 2017-05-15 | 2018-12-06 | スリーエム イノベイティブ プロパティズ カンパニー | Connection structure, connection method and connection member |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH021869U (en) * | 1988-06-15 | 1990-01-09 |
-
2000
- 2000-03-28 JP JP2000089838A patent/JP2000350347A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH021869U (en) * | 1988-06-15 | 1990-01-09 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7339115B2 (en) | 2005-07-15 | 2008-03-04 | Rockbestos Surprenant Cable Corp | Fire resistant electrical cable splice |
| JP2018196207A (en) * | 2017-05-15 | 2018-12-06 | スリーエム イノベイティブ プロパティズ カンパニー | Connection structure, connection method and connection member |
| JP7224093B2 (en) | 2017-05-15 | 2023-02-17 | スリーエム イノベイティブ プロパティズ カンパニー | Connection structure, connection method and connection member |
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