JP2016092869A - Down-conductor of tank - Google Patents

Down-conductor of tank Download PDF

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JP2016092869A
JP2016092869A JP2014220953A JP2014220953A JP2016092869A JP 2016092869 A JP2016092869 A JP 2016092869A JP 2014220953 A JP2014220953 A JP 2014220953A JP 2014220953 A JP2014220953 A JP 2014220953A JP 2016092869 A JP2016092869 A JP 2016092869A
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conductor
tank
round bar
side wall
down conductor
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JP6507570B2 (en
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英司 神谷
Eiji Kamiya
英司 神谷
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IHI Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a down-conductor of tank which is less likely to be cut, even if it is exposed to wind and shaking.SOLUTION: A down-conductor 5 of a LNG tank 1 is fixed to the sidewall 7 by means of fasteners 14, and leads the current of thunder to an underground grounding electrode 15 or ground bus. The down-conductor 5 is partially composed of a twisted wire 5a having elasticity and flexibility, and one half or more of which is composed of a rigid part 5b having rigidity higher than that of the twisted wire 5a. The rigid part 5b is formed into a round bar shape.SELECTED DRAWING: Figure 1

Description

本発明は、タンクの側壁に留め具により固定されて、雷の電流を地中の接地極又は接地母線へ導くタンクの引下げ導体に関する。   The present invention relates to a tank lowering conductor that is fixed to a side wall of a tank by a fastener and guides a lightning current to an underground ground pole or ground bus.

ＬＮＧタンクは、液化天然ガス（Liquefied Natural Gas 以下、ＬＮＧと称する）を貯蔵する低温タンクである。このＬＮＧタンクは、金属製の内槽とコンクリート製の外槽の間に断熱材を配した二重殻タンクで構成されている。この外槽は、一般的にプレストレストコンクリート（Prestressed Concrete 以下、ＰＣと称する）で製造されており、ＬＮＧが内槽から漏洩した際に拡散を防止する防液堤となる。   The LNG tank is a low-temperature tank that stores liquefied natural gas (hereinafter referred to as LNG). The LNG tank is composed of a double shell tank in which a heat insulating material is disposed between a metal inner tank and a concrete outer tank. The outer tub is generally made of prestressed concrete (hereinafter referred to as PC) and serves as a liquid barrier that prevents diffusion when LNG leaks from the inner tub.

そして、このＬＮＧタンクは、落雷した際にその雷の電流を速やかに大地に流すための措置が講じられている。例えば、このＬＮＧタンクは、屋根部分と電気的に接続された引下げ導線が外槽の外周に沿って地上まで降ろされて地中の接地極に接続されている。これによって、ＬＮＧタンクに落雷があっても、雷の電流は、地中へ逃がされるようになっている。   The LNG tank is provided with measures for promptly flowing the lightning current to the ground when a lightning strike occurs. For example, in this LNG tank, a down conductor electrically connected to the roof portion is lowered to the ground along the outer periphery of the outer tub and is connected to the grounding electrode in the ground. As a result, even if there is a lightning strike in the LNG tank, the lightning current is released to the ground.

このような建物に対する落雷防止技術を開示する先行技術文献として、例えば、特許文献１がある。   As a prior art document disclosing lightning strike prevention technology for such a building, for example, there is Patent Document 1.

特開２００５−１８５０１７号公報JP 2005-185017 A

ここで、外槽に沿って配置された引下げ導線は、例えば、可撓性を有した撚り線で構成されており、留め具によってＬＮＧタンクの外槽に固定されている。この撚り線で構成された引下げ導線は、風の影響を受けて撓むことによって揺れると、留め具との間で摩耗が生じる。ここで、撚り線を構成する一本、一本の線は、細いため、このように摩耗が生じると次々と切断されて引下げ導線が断線してしまうおそれがあった。   Here, the down conducting wire arranged along the outer tub is formed of, for example, a flexible stranded wire, and is fixed to the outer tub of the LNG tank by a fastener. When the down conductor composed of the stranded wire is shaken by being bent under the influence of the wind, wear occurs between the wire and the fastener. Here, since the single wire and the single wire constituting the stranded wire are thin, there is a possibility that when the wear is caused in this way, it is cut one after another and the down conductor is broken.

そこで、本発明は、風に晒されて揺れても切断され難いタンクの引下げ導体を提供することを目的とする。   Accordingly, an object of the present invention is to provide a tank lowering conductor that is difficult to be cut even if it is exposed to wind and shakes.

本発明は、タンクの側壁に固定される引下げ導体であって、撚り線部分と、前記撚り線部分よりも剛性が高い剛性部分と、を含むことを特徴としている。   The present invention is a down conductor fixed to a side wall of a tank, and includes a stranded wire portion and a rigid portion having higher rigidity than the stranded wire portion.

前記剛性部分は、棒形状に形成されていることを特徴としている。   The rigid portion is formed in a rod shape.

本発明のタンクの引下げ導体によれば、風に晒されて揺れても切断され難い。   According to the tank lowering conductor of the present invention, it is difficult to cut even if it is exposed to wind and shakes.

ＬＮＧタンクの上方斜めから視た様子を示した斜視図である。It is the perspective view which showed a mode that it looked from the upper diagonal of the LNG tank. ＬＮＧタンクを模式的に示した断面図である。It is sectional drawing which showed the LNG tank typically. （Ａ）は撚り線部分と丸棒部分の接続部分における拡大図であり、（Ｂ）は丸棒部分と銅線部分の接続部分における拡大図である。(A) is an enlarged view in the connection part of a strand wire part and a round bar part, (B) is an enlarged view in the connection part of a round bar part and a copper wire part. （Ａ）は、図３（Ｂ）の丸棒部分と銅線部分の接続部分を、側壁の周方向に沿った方向から視た様子を示す拡大図であり、（Ｂ）は、図３（Ｂ）の丸棒部分と銅線部分の接続部分を、側壁の法線方向に沿った方向から視た様子を示す拡大図である。(A) is the enlarged view which shows a mode that the connection part of the round bar part and copper wire part of FIG. 3 (B) was seen from the direction along the circumferential direction of a side wall, (B) is FIG. It is an enlarged view which shows a mode that the connection part of the round bar part of B) and a copper wire part was seen from the direction along the normal line direction of the side wall.

以下、本発明を実施するための形態の例（以下、実施例と称する）を、図１〜図４を参照しながら説明する。図１は、ＬＮＧタンク１の上方斜めから視た様子を示した斜視図である。図２は、ＬＮＧタンク１（タンク）を模式的に示した断面図である。   Hereinafter, an example of a mode for carrying out the present invention (hereinafter referred to as an example) will be described with reference to FIGS. FIG. 1 is a perspective view showing a state in which the LNG tank 1 is viewed obliquely from above. FIG. 2 is a cross-sectional view schematically showing the LNG tank 1 (tank).

ＬＮＧタンク１は、内槽２と、外槽３と、断熱材４と、を備えている。そして、このＬＮＧタンク１の外槽３には、引下げ導体５が配置されて雷の電流を地中に逃がすようになっている。以下、詳細に述べる。   The LNG tank 1 includes an inner tank 2, an outer tank 3, and a heat insulating material 4. And in the outer tank 3 of this LNG tank 1, the down conductor 5 is arrange | positioned and the electric current of a lightning is released in the ground. Details will be described below.

内槽２は、例えば、９％ニッケル鋼から製造された金属槽であり、ＬＮＧが貯蔵される槽である。そして、この内槽２の外側に位置する外槽３は、底版６と、側壁７と、屋根８と、を備えた構造物である。   The inner tank 2 is a metal tank manufactured from 9% nickel steel, for example, and is a tank in which LNG is stored. The outer tub 3 located outside the inner tub 2 is a structure including a bottom plate 6, side walls 7, and a roof 8.

底版６は、コンクリート製の円板形状の部材である。この底版６は、地面に埋め込まれた複数の基礎杭（不図示）によって支持されている。   The bottom plate 6 is a disk-shaped member made of concrete. The bottom plate 6 is supported by a plurality of foundation piles (not shown) embedded in the ground.

側壁７は、外周面と内周面を有した略円筒形状であり、底版６の上に製造される。そして、この側壁７は、ＰＣ鋼材によってプレストレスが与えられるＰＣ壁である。この側壁７は、ＬＮＧが内槽２から漏洩した際にその拡散を防止する防液堤となる。また、この側壁７の上端は、鉄板１０が敷かれるとともに、外縁に沿って手すり１１が設けられて人が歩ける歩廊１２となっている。   The side wall 7 has a substantially cylindrical shape having an outer peripheral surface and an inner peripheral surface, and is manufactured on the bottom plate 6. The side wall 7 is a PC wall that is prestressed by PC steel. The side wall 7 serves as a liquid barrier to prevent LNG from diffusing when it leaks from the inner tank 2. In addition, an iron plate 10 is laid on the upper end of the side wall 7 and a handrail 11 is provided along the outer edge to form a walkway 12 on which a person can walk.

屋根８は、ドーム形状の導体であり側壁７の上に製造される。この屋根８は、歩廊１２の鉄板１０と電気的に接続されている。そして、この屋根８は、歩廊１２の鉄板１０とともに真上からの落雷に対する受雷部となる。また、この屋根８は、先に説明した内槽２と銅製の線１３で接続されて内槽２に電気が帯電しないような処置が施されている。   The roof 8 is a dome-shaped conductor and is manufactured on the side wall 7. The roof 8 is electrically connected to the iron plate 10 of the walkway 12. And this roof 8 becomes a lightning-receiving part with respect to the lightning strike from right above with the iron plate 10 of the corridor 12. FIG. Further, the roof 8 is connected to the inner tank 2 described above by the copper wire 13 so that the inner tank 2 is not charged with electricity.

断熱材４は、内槽２と外槽３の間に介在するように配されて、内槽２に貯蔵されるＬＮＧが外部からの入熱で気化するのを抑えている。   The heat insulating material 4 is arranged so as to be interposed between the inner tub 2 and the outer tub 3, and suppresses the LNG stored in the inner tub 2 from being vaporized by heat input from the outside.

引下げ導体５は、留め金具１４（留め具）によって側壁７の外周に所定の隙間を持って固定されて、雷の電流を地中の接地極１５まで導く部材である。この引下げ導体５は、ＬＮＧタンク１の周方向に沿って所定の間隔で複数配置され、一端側が歩廊１２の鉄板１０に接続されて、側壁７の上端から地上まで側壁７に対して沿うようにして降ろされ、そして、他端側が地中の接地極１５に接続される。または、側壁７の上端から側壁７に対して沿うように途中まで降ろされる。   The down conductor 5 is a member that is fixed to the outer periphery of the side wall 7 with a predetermined gap by a fastener 14 (fastener) and guides a lightning current to the grounding electrode 15 in the ground. A plurality of the down conductors 5 are arranged at predetermined intervals along the circumferential direction of the LNG tank 1, and one end side is connected to the iron plate 10 of the walkway 12 so that the side wall 7 extends along the side wall 7 from the upper end to the ground. The other end is connected to the grounding electrode 15 in the ground. Alternatively, it is lowered halfway along the side wall 7 from the upper end of the side wall 7.

ＬＮＧタンク１の引下げ導体５は、ＪＩＳ Ａ４２０１−２００３が適用される。ＪＩＳ Ａ４２０１−２００３によれば、引下げ導体５は、水平環状導体１６で相互に接続し、等電位化するようにしている。   JIS A4201-2003 is applied to the lowering conductor 5 of the LNG tank 1. According to JIS A4201-2003, the down conductors 5 are connected to each other by the horizontal annular conductor 16 so as to be equipotential.

この水平環状導体１６は、例えば、アルミ鬼撚り線であり、ＬＮＧタンク１を水平方向に囲んで閉ループを構成する。この水平環状導体１６は、一般的な十字留め金具１７、Ｔ字留め金具２０によって引下げ導体５に固定されている。   The horizontal annular conductor 16 is, for example, an aluminum stranded wire and surrounds the LNG tank 1 in the horizontal direction to form a closed loop. The horizontal annular conductor 16 is fixed to the lowered conductor 5 by a general cross fastener 17 and a T-shaped fastener 20.

そして、複数の引下げ導体５は、それぞれが十字留め金具１７、Ｔ字留め金具２０によって水平環状導体１６に電気的に接続されている。これによって、引下げ導体５と水平環状導体１６は、側壁７の外周に図１で示すように配置される。   Each of the plurality of down conductors 5 is electrically connected to the horizontal annular conductor 16 by a cross fastener 17 and a T-shaped fastener 20. Thereby, the down conductor 5 and the horizontal annular conductor 16 are arranged on the outer periphery of the side wall 7 as shown in FIG.

このように側壁７の外周に配置された引下げ導体５と水平環状導体１６は、側方からの落雷に対する受雷部となる。また、この引下げ導体５は、側方からの雷の電流を接地極１５へ導くとともに、屋根８及び歩廊１２の鉄板１０からの雷の電流も接地極１５へ導く。   Thus, the down conductor 5 and the horizontal annular conductor 16 arranged on the outer periphery of the side wall 7 serve as a lightning receiving portion for a lightning strike from the side. In addition, the down conductor 5 guides lightning current from the side to the ground electrode 15, and also guides lightning current from the iron plate 10 of the roof 8 and the walkway 12 to the ground electrode 15.

以下、図３を参照しながら、引下げ導体５を構成する撚り線部分５ａと、丸棒部分５ｂ（剛性部分）と、銅線部分５ｃと、について説明する。図３（Ａ）は撚り線部分５ａと丸棒部分５ｂの接続部分における拡大図であり、図３（Ｂ）は、丸棒部分５ｂと銅線部分５ｃの接続部分における拡大図である。   Hereinafter, the stranded wire portion 5a, the round bar portion 5b (rigid portion), and the copper wire portion 5c constituting the down conductor 5 will be described with reference to FIG. FIG. 3A is an enlarged view of a connection portion between the stranded wire portion 5a and the round bar portion 5b, and FIG. 3B is an enlarged view of a connection portion between the round bar portion 5b and the copper wire portion 5c.

撚り線部分５ａは、例えば、直径２ｍｍの細いアルミニウムの素線を複数撚り合わせた断面積が７９ｍｍ2のアルミ鬼撚り線であり、導電性、伸縮性、可撓性を有する。この撚り線部分５ａは、引下げ導体５の一端側の一部を構成し、側壁７に配置された際に側壁７の上端部に配置される。側壁７の上端部は、側壁７から張り出すようにして肩部７ａが形成されている。撚り線部分５ａは、可撓性を有していることから曲げられてこの肩部７ａに沿うように留め金具１４によって配置される。 The stranded wire portion 5a is, for example, an aluminum demon stranded wire having a cross-sectional area of 79 mm 2 formed by twisting a plurality of thin aluminum strands having a diameter of 2 mm, and has conductivity, stretchability, and flexibility. This stranded wire portion 5 a constitutes a part of one end side of the down conductor 5 and is disposed at the upper end portion of the side wall 7 when disposed on the side wall 7. A shoulder 7 a is formed at the upper end of the side wall 7 so as to protrude from the side wall 7. Since the stranded wire portion 5a has flexibility, the stranded wire portion 5a is bent and disposed along the shoulder portion 7a by the fastener 14.

丸棒部分５ｂは、例えば、直径１０ｍｍの中実の丸棒形状のアルミニウムであり、導電性を有する。ここで、アルミニウムとは、純アルミニウムの他、銅、マンガン、ケイ素、マグネシウム、亜鉛、ニッケル等を単独又は複数含んだアルミニウム合金も含む。   The round bar portion 5b is, for example, a solid round bar-shaped aluminum having a diameter of 10 mm and has conductivity. Here, aluminum includes aluminum alloy including copper, manganese, silicon, magnesium, zinc, nickel and the like alone or in addition to pure aluminum.

丸棒部分５ｂは、撚り線部分５ａを構成するアルミニウムの素線よりも径が大きい。これによって、丸棒部分５ｂは、撚り線部分５ａよりも撓み難く、剛性が高くなっている。すなわち、同じ材料で同じ断面積の場合、丸棒形状（棒形状）は、線を撚った撚り線形状よりも撓み難く、剛性が高くなっている。この丸棒部分５ｂは、側壁７の外周面に沿わせて配置される。そして、この丸棒部分５ｂは、引下げ導体５の全長の大部分である半分よりも多くの部分を占めている。   The round bar portion 5b has a larger diameter than the aluminum strand constituting the stranded wire portion 5a. Thereby, the round bar portion 5b is more difficult to bend than the stranded wire portion 5a, and has high rigidity. That is, in the case of the same material and the same cross-sectional area, the round bar shape (bar shape) is more difficult to bend than the stranded wire shape obtained by twisting the wire, and has high rigidity. The round bar portion 5 b is disposed along the outer peripheral surface of the side wall 7. The round bar portion 5b occupies more than half that is the majority of the entire length of the down conductor 5.

ここで、引下げ導体５の全長のうち丸棒部分５ｂが占める割合が半分以上である場合を例示したが、丸棒部分５ｂは、その占める割合が高ければ高いほど、引下げ導体５における全体の剛性が高くなる。   Here, the case where the ratio of the round bar portion 5b to the total length of the down conductor 5 is half or more is illustrated, but the round bar portion 5b has a higher overall rigidity in the down conductor 5 as the ratio of the ratio increases. Becomes higher.

上記したように、引下げ導体５を構成するうち、撚り線部分５ａと丸棒部分５ｂは、アルミニウムで形成されている。そして、引下げ導体５は、屋外にあり直射日光、及び外気に晒される。このためアルミニウム部分は、伸びたり縮んだりする。   As described above, the strand wire portion 5a and the round bar portion 5b are made of aluminum while constituting the down conductor 5. The down conductor 5 is outdoors and exposed to direct sunlight and outside air. For this reason, the aluminum portion expands or contracts.

この際、引下げ導体５を構成するうちの丸棒部分５ｂは、伸長した際に撚り線部分５ａよりも撓み難く、このため、固定されているとその伸びを許容することができない。しかしながら、引下げ導体５は、可撓性を有する撚り線部分５ａをその一部に含むため、撚り線部分５ａが撓み変形することによって伸長を許容し、これによって、断線を防止する。   At this time, the round bar portion 5b constituting the down conductor 5 is less likely to bend than the stranded wire portion 5a when stretched, and therefore cannot be allowed to elongate if fixed. However, since the pulling conductor 5 includes a flexible stranded wire portion 5a in its part, the stranded wire portion 5a is allowed to extend when the stranded wire portion 5a is bent and deformed, thereby preventing disconnection.

銅線部分５ｃは、銅で構成された断面積が１００ｍｍ2の導線であり、丸棒部分５ｂよりも断面積が大きい導線である。銅とは、純銅の他、亜鉛、鉛、錫、アルミニウム、ニッケル等を単独又は複数含んだ銅合金も含む。この銅線部分５ｃは、引下げ導体５の他端側の一部を構成し、側壁７に配置された際に側壁７の下端部に位置する。この銅線部分５ｃは、アルミニウムで構成された撚り線部分５ａよりも更に剛性が高くなっている。これは、銅は、アルミニウムよりも比重が大きいため、アルミニウムで同様に構成した導線よりも重量が重いためである。 The copper wire portion 5c is a conductive wire having a cross-sectional area of 100 mm 2 made of copper and having a larger cross-sectional area than the round bar portion 5b. In addition to pure copper, copper includes copper alloys containing zinc, lead, tin, aluminum, nickel and the like alone or in combination. The copper wire portion 5 c constitutes a part of the other end side of the down conductor 5 and is located at the lower end portion of the side wall 7 when disposed on the side wall 7. The copper wire portion 5c has higher rigidity than the stranded wire portion 5a made of aluminum. This is because copper has a higher specific gravity than aluminum and is therefore heavier than a conductive wire similarly constructed of aluminum.

ここで、引下げ導体５は、ＬＮＧタンク１の形状の関係で側壁７に沿わせて固定することができなかったり、塗装との関係で留め金具１４が側壁７に設置できなかったりする場合がある。そこで、そのような場合は、アルミニウムで構成された部分よりも外径を大きくして更に剛性を高めた銅線部分５ｃを、側壁７に沿わさずに側壁７から離れるように斜めに配することができる。   Here, the down conductor 5 may not be fixed along the side wall 7 because of the shape of the LNG tank 1, or the fastener 14 may not be installed on the side wall 7 because of the relationship with the coating. . Therefore, in such a case, the copper wire portion 5c having an outer diameter larger than that of the portion made of aluminum and further improved in rigidity is arranged obliquely so as to be away from the side wall 7 without being along the side wall 7. be able to.

次に図４を参照しながら、丸棒部分５ｂと銅線部分５ｃの接続部分を説明する。図４（Ａ）は、図３（Ｂ）の丸棒部分５ｂと銅線部分５ｃの接続部分を、側壁７の周方向に沿った方向から視た様子を示す拡大図である。図４（Ｂ）は、図３（Ｂ）の丸棒部分５ｂと銅線部分５ｃの接続部分を、側壁７の法線方向に沿った方向から視た様子を示す拡大図である。   Next, the connection part of the round bar part 5b and the copper wire part 5c is demonstrated, referring FIG. FIG. 4A is an enlarged view showing a connection portion between the round bar portion 5 b and the copper wire portion 5 c in FIG. 3B as viewed from the direction along the circumferential direction of the side wall 7. FIG. 4B is an enlarged view showing a connection portion between the round bar portion 5 b and the copper wire portion 5 c in FIG. 3B as viewed from the direction along the normal direction of the side wall 7.

図４に示すとおり、丸棒部分５ｂと銅線部分５ｃの端部は、締め付け型コネクタ１８によって接続される。締め付け型コネクタ１８は、Ｕ字形のボルト１８ａと、押さえ金具１８ｂと、ナット１８ｃと、を有している。丸棒部分５ｂと銅線部分５ｃの端部は、Ｕ字形のボルト１８ａに配した状態で押さえ金具１８ｂによって押えつけた状態において、ナット１８ｃによって締め付けられる。これによって、丸棒部分５ｂと銅線部分５ｃの端部が電気的に接続される。そして、この接続部分は、絶縁テープ（不図示）で巻かれてその接続が補強される。   As shown in FIG. 4, the ends of the round bar portion 5 b and the copper wire portion 5 c are connected by a clamp-type connector 18. The tightening connector 18 includes a U-shaped bolt 18a, a presser fitting 18b, and a nut 18c. The ends of the round bar portion 5b and the copper wire portion 5c are tightened by the nut 18c in a state of being pressed by the presser fitting 18b while being arranged on the U-shaped bolt 18a. Thereby, the ends of the round bar portion 5b and the copper wire portion 5c are electrically connected. And this connection part is wound with an insulating tape (not shown), and the connection is reinforced.

丸棒部分５ｂと銅線部分５ｃの端部の接続部分で説明したが、撚り線部分５ａと丸棒部分５ｂの端部も同様に接続される。なお、以上に説明した接続方法は、一例でありこれに限定されず、接続部分に応じた接続金具によって互いが電気的に接続されるように接続されていればどのような方法を用いて接続しても良い。   Although the connection part of the edge part of the round bar part 5b and the copper wire part 5c was demonstrated, the edge part of the strand wire part 5a and the round bar part 5b is connected similarly. In addition, the connection method demonstrated above is an example, it is not limited to this, What kind of method will be used if it connects so that it may be electrically connected mutually by the metal fitting according to a connection part? You may do it.

以上に説明した引下げ導体５が設置されたＬＮＧタンク１に真上から落雷を受けた場合と側方から落雷を受けた場合を説明する。ＬＮＧタンク１に真上から落雷を受けた場合は、ＬＮＧタンク１の屋根８と歩廊１２の鉄板１０が受雷部となる。この落雷に伴って屋根８に生じた電流は、屋根８を流れ、その後、屋根８から歩廊１２の鉄板１０を介して引下げ導体５に流れる。そして、この雷の電流は、引下げ導体５から地中の接地極１５へ導かれて放電される。   A case where a lightning strike is received from directly above and a case where a lightning strike is received from the side will be described. When the LNG tank 1 receives a lightning strike from directly above, the roof 8 of the LNG tank 1 and the iron plate 10 of the corridor 12 serve as a lightning receiving portion. The current generated in the roof 8 due to the lightning strike flows through the roof 8, and then flows from the roof 8 to the down conductor 5 through the iron plate 10 of the corridor 12. The lightning current is guided from the down conductor 5 to the grounding electrode 15 in the ground and discharged.

ＬＮＧタンク１に側方から落雷を受けた場合は、ＬＮＧタンク１の側壁７の外周面のまわりに配された引下げ導体５と水平環状導体１６が受雷部となる。そして、側方からの落雷に伴う電流は、そのまま引下げ導体５を流れて地中の接地極１５へ導かれて放電される。   When the LNG tank 1 receives a lightning strike from the side, the down conductor 5 and the horizontal annular conductor 16 disposed around the outer peripheral surface of the side wall 7 of the LNG tank 1 serve as a lightning receiving portion. And the electric current accompanying the lightning strike from the side flows through the down conductor 5 as it is, is guided to the ground electrode 15 in the ground, and is discharged.

以上に説明した本発明のタンクの引下げ導体５によれば、引下げ導体５は、可撓性を有した撚り線部分５ａと、この撚り線部分５ａよりも剛性が高い丸棒部分５ｂ（剛性部分）と、を含んでいる。この丸棒部分５ｂは、撚り線のみで引下げ導線を構成した場合と比較して、風の影響を受けても撓み変形し難く、これによって留め金具１４との摩耗が減って切断され難くなる。   According to the tank lowering conductor 5 of the present invention described above, the lowering conductor 5 includes a flexible stranded wire portion 5a and a round bar portion 5b (rigid portion) having a higher rigidity than the stranded wire portion 5a. ) And. The round bar portion 5b is less likely to bend and deform even under the influence of wind as compared to the case where the pull-down lead wire is constituted by only a stranded wire, and this reduces wear on the fastener 14 and makes it difficult to cut.

また、引下げ導体５は、可撓性を有した撚り線部分５ａを有している。これによって、丸棒部分５ｂが伸長しても撚り線部分５ａが撓み変形することで伸長分を許容して断線することがない。   The down conductor 5 has a stranded portion 5a having flexibility. As a result, even if the round bar portion 5b is elongated, the stranded wire portion 5a is bent and deformed, so that the elongation is allowed and the wire is not broken.

また、本発明のタンクの引下げ導体５によれば、引下げ導体５は、その大部分が撚り線部分５ａを構成するアルミニウムの素線の径よりも径が大きい丸棒部分５ｂ（棒形状）となっている。よって、大部分が丸棒部分５ｂで構成された引下げ導体５は、その全てを撚り線で構成した場合よりも留め金具１４との摩耗によって切断し難くなっている。   Further, according to the tank pull-down conductor 5 of the present invention, the pull-down conductor 5 has a round bar portion 5b (bar shape) whose major portion is larger than the diameter of the aluminum strand constituting the stranded wire portion 5a. It has become. Therefore, the lowering conductor 5 that is mostly constituted by the round bar portion 5b is less likely to be cut by abrasion with the fastener 14 than when all of the lowered conductors are constituted by stranded wires.

また、大部分を丸棒部分５ｂで構成した本発明のタンクの引下げ導体５によれば、この丸棒部分５ｂがシンプルな形状であるためＬＮＧタンク１の側壁７に配されても外観に与える影響が少ない。また、丸棒部分５ｂは、例えば、板形状とした場合よりも風の抵抗を受け難くなっており、風に煽られ難くなっている。   Further, according to the tank pulling conductor 5 of the present invention, which is mostly constituted by the round bar portion 5b, the round bar portion 5b has a simple shape, so that even if it is arranged on the side wall 7 of the LNG tank 1, it is given to the appearance. There is little influence. In addition, the round bar portion 5b is less susceptible to wind resistance than, for example, a plate shape, and is less likely to be blown by the wind.

また、本発明のタンクの引下げ導体５によれば、接地極１５に接続される側の一部が銅の導線（銅線部分５ｃ）で構成され、残部がアルミニウムで構成されている。すなわち、引下げ導体５は、接地極１５側である下端側にアルミニウムよりも更に剛性が高い銅線部分５ｃを有することによって、下端側の留め金具１４の設置間隔を広げて数量を減らすことが可能になる。また、引下げ導体５を側壁７に沿わせられない部分があっても、その部分を、丸棒部分５ｂよりも外径を大きくして剛性を高めた銅線部分５ｃにして、側壁７に沿わさずに側壁７から離れるように斜めに配することができる。   Further, according to the tank pulling conductor 5 of the present invention, a part of the side connected to the ground electrode 15 is constituted by a copper conducting wire (copper wire part 5c), and the remaining part is constituted by aluminum. That is, the lower conductor 5 has a copper wire portion 5c having rigidity higher than that of aluminum on the lower end side which is the ground electrode 15 side, so that the installation interval of the fasteners 14 on the lower end side can be widened to reduce the quantity. become. Further, even if there is a portion where the down conductor 5 cannot be along the side wall 7, the portion is made into a copper wire portion 5 c having a larger outer diameter than the round bar portion 5 b to enhance rigidity, and along the side wall 7. Instead, it can be arranged obliquely away from the side wall 7.

なお、本発明のタンクの引下げ導体５は、上述の実施例にのみ限定されない。引下げ導体５のうち剛性部分を丸棒形状で説明したがこれに限定されない。例えば、角棒形状でも良いし、板形状にしても良い、また、ロッド形状全般を含む他、これらの形状は、断面積が確保できれば中実、中空の場合も可能である。   The tank pull-down conductor 5 of the present invention is not limited to the above-described embodiment. The rigid portion of the pull-down conductor 5 has been described as a round bar shape, but is not limited thereto. For example, a square bar shape or a plate shape may be used. In addition to the rod shape in general, these shapes may be solid or hollow as long as the cross-sectional area can be secured.

また、本発明のタンクの引下げ導体５は、撚り線部分５ａが引下げ導体５の一端側の一部を構成し、側壁７に配置された際に側壁７の上端部に位置する構成で説明したがこれに限定されない。例えば、撚り線部分５ａは、引下げ導体５の真ん中や他端側に配置されていても良い。また、撚り線部分５ａは、長手方向に複数箇所配されていても良い。   Further, the lowering conductor 5 of the tank of the present invention has been described with a configuration in which the stranded portion 5a constitutes a part of one end side of the lowering conductor 5 and is positioned at the upper end of the side wall 7 when arranged on the side wall 7. However, it is not limited to this. For example, the stranded wire portion 5 a may be arranged in the middle or the other end side of the down conductor 5. Moreover, the strand wire part 5a may be arranged in multiple places in the longitudinal direction.

また、本発明のタンクの引下げ導体５は、撚り線部分５ａと丸棒部分５ｂをアルミニウムで形成する構成で説明したがこれに限定されない。例えば、ＳＵＳでも良い。引下げ導体５の材料は、導電性を有し雷の電流を流すことができれば良く、例示した材料に限定されない。   Moreover, although the pulling conductor 5 of the tank of the present invention has been described with the configuration in which the stranded portion 5a and the round bar portion 5b are formed of aluminum, the invention is not limited thereto. For example, SUS may be used. The material of the pull-down conductor 5 is not limited to the exemplified material as long as it has conductivity and can flow a lightning current.

本発明のタンクの引下げ導体は、本発明の要旨を逸脱しない範囲内において種々変更することができる。   The tank pull-down conductor of the present invention can be variously modified without departing from the gist of the present invention.

１ ＬＮＧタンク（タンク）
３ 外槽
５ 引下げ導体
５ａ 撚り線部分
５ｂ 丸棒部分（剛性部分）
５ｃ 銅線部分（更に剛性が高い部分）
７ 側壁
１４ 留め金具（留め具）
１５ 接地極 1 LNG tank (tank)
3 Outer tank 5 Down conductor 5a Stranded wire part 5b Round bar part (rigid part)
5c Copper wire part (part with higher rigidity)
7 Side wall 14 Fastener (fastener)
15 Grounding electrode

Claims (2)

タンクの側壁に固定される引下げ導体であって、
撚り線部分と、前記撚り線部分よりも剛性が高い剛性部分と、を含むことを特徴とするタンクの引下げ導体。 A down conductor fixed to the side wall of the tank,
A pulling conductor for a tank, comprising: a stranded portion; and a rigid portion having higher rigidity than the stranded portion. 前記剛性部分は、棒形状であることを特徴とする請求項１に記載のタンクの引下げ導体。   2. The tank pulling conductor according to claim 1, wherein the rigid portion has a bar shape.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110145154A (en) * 2019-06-03 2019-08-20 四川电力设计咨询有限责任公司 Rectangle steel silo and its construction method with beam-string structure system
JP2019199750A (en) * 2018-05-17 2019-11-21 株式会社大林組 building

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593729U (en) * 1982-06-28 1984-01-11 大阪避雷針工業株式会社 Expansion and contraction absorption structure of lightning conductor
JP2004265791A (en) * 2003-03-03 2004-09-24 Osaka Hiraishin Kogyo Kk Flexible terminal
JP2006014567A (en) * 2004-06-29 2006-01-12 Taisei Corp Mechanism for protecting sidewall from lightning in existing building
JP2012065393A (en) * 2010-09-14 2012-03-29 Ihi Corp Structure and lightning conductor installation method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS593729U (en) * 1982-06-28 1984-01-11 大阪避雷針工業株式会社 Expansion and contraction absorption structure of lightning conductor
JP2004265791A (en) * 2003-03-03 2004-09-24 Osaka Hiraishin Kogyo Kk Flexible terminal
JP2006014567A (en) * 2004-06-29 2006-01-12 Taisei Corp Mechanism for protecting sidewall from lightning in existing building
JP2012065393A (en) * 2010-09-14 2012-03-29 Ihi Corp Structure and lightning conductor installation method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019199750A (en) * 2018-05-17 2019-11-21 株式会社大林組 building
JP7119563B2 (en) 2018-05-17 2022-08-17 株式会社大林組 building
CN110145154A (en) * 2019-06-03 2019-08-20 四川电力设计咨询有限责任公司 Rectangle steel silo and its construction method with beam-string structure system

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