JP7193720B2 - Ground plate for overhead transmission line work - Google Patents

Ground plate for overhead transmission line work Download PDF

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JP7193720B2
JP7193720B2 JP2019004463A JP2019004463A JP7193720B2 JP 7193720 B2 JP7193720 B2 JP 7193720B2 JP 2019004463 A JP2019004463 A JP 2019004463A JP 2019004463 A JP2019004463 A JP 2019004463A JP 7193720 B2 JP7193720 B2 JP 7193720B2
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cross arm
transmission line
bolt
plate
pair
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JP2020114131A (en
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善昭 黒瀬
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Chugoku Electric Power Co Inc
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Description

この発明は、鉄塔の腕金に取り付けられる架空送電線作業用接地板に関するものである。 The present invention relates to a grounding plate for overhead transmission line work attached to a cross arm of a steel tower.

架空送電線の点検や電気工事は、点検箇所や工事箇所を停電状態にして作業が行われるが、停電作業時でも架空送電線に誘導電流が誘起される場合がある。そこで、従来から、架空送電線の点検や電気工事は、架空送電線に誘起される誘導電流による作業者の感電事故を防止するため、鉄塔の腕金に取り付けられた架空送電線作業用接地板（以下、接地板と適宜略称する）と架空送電線とをアース線で接続し、架空送電線の誘導電流をアース線、接地板、及び鉄塔を介して地中に逃がす（アースする）ようになっている（特許文献１（特に図２）参照）。 Overhead power transmission line inspection and electrical work are carried out while the inspection or construction site is in a power outage state, but even during power outage work, an induced current may be induced in the overhead power transmission line. Therefore, in order to prevent workers from being electrocuted due to induced currents induced in overhead transmission lines, inspections and electrical work on overhead transmission lines have conventionally (hereinafter abbreviated as a ground plate) and the overhead transmission line are connected with a ground wire so that the induced current of the overhead transmission line is released (grounded) to the ground via the ground wire, ground plate, and steel tower. (Refer to Patent Document 1 (especially FIG. 2)).

特開２０１０－１１９１６５号JP 2010-119165

従来、鉄塔の腕金に接地板を取り付ける作業は、予め用意された接地板の複数のボルト取付穴（接地板側ボルト取付穴）の穴間隔及び穴径と合うように、腕金にドリル等でボルト取付穴（腕金側ボルト取付穴）を穴あけ加工し、腕金側ボルト取付穴及び接地板側ボルト取付穴にボルトの軸部を挿通して、接地板を腕金にボルト・ナットで締め付け固定している。しかしながら、鉄塔の腕金にボルト取付穴をドリルで穴あけ加工する作業は、高所での作業であるため、作業者の作業負担が大きく、接地板の腕金への取付作業が容易でないという問題を有していた。 Conventionally, the work of attaching the grounding plate to the cross arm of the steel tower involves drilling the cross arm so that it matches the hole spacing and hole diameter of the plurality of bolt mounting holes (bolt mounting holes on the grounding plate side) of the grounding plate prepared in advance. Drill the bolt mounting holes (bolt mounting holes on the cross arm side) with , insert the shafts of the bolts into the bolt mounting holes on the cross arm side and the bolt mounting holes on the grounding plate side, and attach the grounding plate to the cross arm with bolts and nuts. It is tightened and fixed. However, the work of drilling the bolt mounting holes in the cross arm of the steel tower is a work at a high place, so the work burden on the worker is heavy, and the work of attaching the ground plate to the cross arm is not easy. had

そこで、本発明は、鉄塔の腕金への取付作業を容易に行えるようにした架空送電線作業用接地板を提供する。 SUMMARY OF THE INVENTION Accordingly, the present invention provides a grounding plate for overhead transmission line work that facilitates the work of attaching it to a cross arm of a steel tower.

本発明は、鉄塔２の腕金３に取り付けられ、架空送電線４にアース線２０を介して接続される架空送電線作業用接地板１に関するものである。この発明に係る架空送電線作業用接地板１は、前記架空送電線４の一端を支持する電線プレート５を前記腕金３の先端に固定する複数のボルト・ナット６を使用して、前記電線プレート５と共に前記腕金３の先端に締め付け固定されるようになっている。 The present invention relates to a grounding plate 1 for overhead power transmission line work attached to a cross arm 3 of a steel tower 2 and connected to an overhead power transmission line 4 via a ground wire 20 . A grounding plate 1 for overhead transmission line work according to the present invention uses a plurality of bolts and nuts 6 for fixing a wire plate 5 supporting one end of the overhead transmission line 4 to the tip of the cross arm 3 to secure the wire. Together with the plate 5, it is fastened and fixed to the tip of the cross arm 3. As shown in FIG.

本発明に係る接地板は、電線プレートを腕金の先端に固定する複数のボルト・ナットを使用して、電線プレートと共に腕金の先端に締め付け固定されるようになっているため、腕金に固定するためのボルト穴を腕金に新たに穴あけ作業する必要がなく、鉄塔の腕金への取付作業を容易に行うことができる。 The ground plate according to the present invention uses a plurality of bolts and nuts for fixing the wire plate to the tip of the cross arm, and is fastened and fixed to the tip of the cross arm together with the wire plate. There is no need to newly drill a bolt hole for fixing in the cross arm, and the mounting work to the cross arm of the steel tower can be easily performed.

本発明の実施例に係る架空送電線作業用接地板の取付状態を示す図であり、図１（ａ）は架空送電線作業用接地板と鉄塔の腕金との関係を簡略化して示す平面図、図１（ｂ）は図１（ａ）のＡ部の拡大図、図１（ｃ）は図１（ｂ）のＢ１方向から見た腕金先端側の側面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a plan view showing a simplified relationship between a ground plate for overhead transmission line work and a cross arm of a steel tower; FIG. FIG. 1(b) is an enlarged view of the A portion of FIG. 1(a), and FIG. 1(c) is a side view of the tip side of the cross arm viewed from the direction B1 of FIG. 1(b). 図２（ａ）は本発明の実施例に係る架空送電線作業用接地板の平面図、図２（ｂ）は本発明の実施例に係る架空送電線作業用接地板の側面図、図２（ｃ）は第１変形例に係る架空送電線作業用接地板の平面図、図２（ｄ）は第２変形例に係る架空送電線作業用接地板の平面図である。FIG. 2(a) is a plan view of the grounding plate for overhead transmission line work according to the embodiment of the present invention, FIG. 2(b) is a side view of the grounding plate for overhead transmission line work according to the embodiment of the present invention, FIG. (c) is a plan view of the ground plate for overhead transmission line work according to the first modification, and FIG. 2(d) is a plan view of the ground plate for overhead transmission line work according to the second modification. 図３（ａ）は架空送電線の接地状態を示す腕金先端側の平面図であり、図３（ｂ）は図３（ａ）のＢ２方向から見た腕金先端側の側面図である。FIG. 3(a) is a plan view of the cross arm tip side showing the grounded state of the overhead transmission line, and FIG. 3(b) is a side view of the cross arm tip side as seen from the direction B2 in FIG. 3(a). .

以下、本発明の実施例を図面に基づき詳述する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１から図３に示すように、本発明の実施例に係る架空送電線作業用接地板１（以下、接地板と略称する）は、鉄塔２の腕金３の先端であって、架空送電線４の一端側を引き留めるように支持する電線プレート５が複数のボルト・ナット６で固定された腕金３の先端に一対のボルト・ナット６，６で固定されている。接地板１は、平面視した形状が矩形形状の薄板である。そして、この接地板１は、腕金３に固定される腕金固定部（斜線部）７と、接地端子８が取り付けられる接地端子取付部（斜線部以外の領域）１０と、を有している（図２（ａ）参照）。 As shown in FIGS. 1 to 3, an overhead transmission line work grounding plate 1 (hereinafter abbreviated as a grounding plate) according to the embodiment of the present invention is a tip of a cross arm 3 of a steel tower 2 and is used for overhead transmission. A wire plate 5 for supporting one end of the wire 4 is fixed by a pair of bolts and nuts 6 to the tip of the cross arm 3 fixed by a plurality of bolts and nuts 6 . The ground plate 1 is a thin plate having a rectangular shape in plan view. The ground plate 1 has a cross arm fixing portion (shaded portion) 7 fixed to the cross arm 3 and a ground terminal attachment portion (region other than the shaded portion) 10 to which the ground terminal 8 is attached. (See FIG. 2(a)).

接地板１の腕金固定部７には、電線プレート５を腕金３に固定する複数のボルト・ナット６のうちの隣り合う一対のボルト・ナット６，６のボルト６ａの軸部を係合するボルト穴（丸穴）１１が一対形成されている。また、接地板１の接地端子取付部１０は、架空送電線４の一端側に配置された電線設置部材１２（例えば、長幹がいし１３、アークホーン１４）との接触を考慮する必要がない場合、図１（ａ）及び図１（ｂ）に示すように平板状のままで腕金３に固定されるが、架空送電線４の一端側に配置された電線設置部材１２との接触を考慮する必要がある場合、電線設置部材１２との接触を避ける折り曲げ部分１５が適宜形成される。なお、本実施例における接地板１の接地端子取付部１０は、架空送電線４の一端側に配置された電線設置部材１２との接触を回避するため、折り曲げ部分１５が側辺１６に沿って折り曲げ形成されている。また、接地板１の接地端子取付部１０は、電線設置部材１２との接触を避けるためや、作業スペースを確保するために、一部（例えば、図１（ａ）の点線１７で区切る三角状部分１８）を切り欠いてもよい。 The cross arm fixing portion 7 of the ground plate 1 is engaged with the shaft portion of the bolt 6a of a pair of adjacent bolts/nuts 6 among a plurality of bolts/nuts 6 for fixing the electric wire plate 5 to the cross arm 3. A pair of bolt holes (round holes) 11 are formed. In addition, when the ground terminal mounting portion 10 of the ground plate 1 does not need to consider contact with the wire installation member 12 (for example, the long trunk insulator 13, the arc horn 14) arranged on one end side of the overhead transmission line 4 As shown in FIGS. 1(a) and 1(b), it is fixed to the cross arm 3 as it is in a flat plate shape, but the contact with the wire installation member 12 arranged on one end side of the overhead transmission line 4 is taken into consideration. If necessary, a bent portion 15 is appropriately formed to avoid contact with the wire installation member 12 . It should be noted that the ground terminal mounting portion 10 of the ground plate 1 in this embodiment has a bent portion 15 along the side 16 to avoid contact with the wire installation member 12 arranged on one end side of the overhead power transmission line 4 . It is formed by bending. In order to avoid contact with the wire installation member 12 and to secure a work space, the ground terminal mounting portion 10 of the ground plate 1 is partly (for example, triangularly divided by the dotted line 17 in FIG. 1A). Part 18) may be cut out.

また、本実施例において、接地板１の接地端子取付部１０は、腕金３から前方に張り出した平板状部分（腕金固定部７から前方に延出した平板状部分）に接地端子８が固定されている。接地端子８は、架空送電線４に接続されるアース線２０の一端を固定するようになっており、上部のハンドル２１を回動操作することにより、接地板１の接地端子取付部１０に着脱可能に固定されている。なお、この接地端子８は、腕金３から側方に張り出した接地板１の接地端子取付部１０（例えば、折り曲げ部分１５）に着脱可能に固定してもよい。 In this embodiment, the ground terminal mounting portion 10 of the ground plate 1 has the ground terminal 8 attached to a flat plate-shaped portion projecting forward from the cross arm 3 (a flat plate-shaped portion extending forward from the cross arm fixing portion 7). Fixed. The ground terminal 8 is adapted to fix one end of a ground wire 20 connected to the overhead transmission line 4, and is attached to and detached from the ground terminal mounting portion 10 of the ground plate 1 by rotating the handle 21 on the top. fixed as possible. The ground terminal 8 may be detachably fixed to a ground terminal mounting portion 10 (for example, a bent portion 15) of the ground plate 1 projecting laterally from the arm 3. As shown in FIG.

以上のような接地板１は、電線プレート５を腕金３の先端に固定する複数のボルト・ナット６のうちの隣り合う一対のボルト・ナット６，６のナット６ｂ，６ｂをボルト６ａ，６ａから取り外し、ナット６ｂ，６ｂを取り外した一対のボルト６ｂ，６ｂの軸部に一対のボルト穴１１，１１を係合した後、ナット６ｂ，６ｂをボルト６ａ，６ａに螺合して、一対のボルト・ナット６，６で電線プレート５と共に腕金３に締め付け固定される。 In the ground plate 1 as described above, the nuts 6b, 6b of a pair of adjacent bolts/nuts 6, 6 out of a plurality of bolts/nuts 6 for fixing the electric wire plate 5 to the tip of the cross arm 3 are connected to the bolts 6a, 6a. After engaging a pair of bolt holes 11, 11 with the shaft portions of the pair of bolts 6b, 6b from which the nuts 6b, 6b have been removed, the nuts 6b, 6b are screwed onto the bolts 6a, 6a to form a pair of It is fastened and fixed to the cross arm 3 together with the electric wire plate 5 by bolts and nuts 6 , 6 .

腕金３の先端に固定された接地板１は、例えば、図３に示すように架空送電線４に電気的に接続される。すなわち、接地板１は、架空送電線４に取り付けられたアークホーン１４（長幹がいし１３の前方に取り付けられたアークホーン１４）と、このアークホーン１４を把持する接地棒２２の金属製フック２３と、この金属製フック２３に接続されたアース線２０と、このアース線２０の一端が固定される接地端子８と、を介して架空送電線４に電気的に接続され、架空送電線４の誘導電流を鉄塔２を介して地中に逃がす（アースする）ようになっている。なお、接地棒２２は、基端部２４（金属製フック２３が取り付けられた先端部と反対側の端部）が腕金３に紐、ロープ、又は粘着テープ等の固定手段２５で固定される。 The grounding plate 1 fixed to the tip of the cross arm 3 is electrically connected to an overhead transmission line 4 as shown in FIG. 3, for example. That is, the grounding plate 1 consists of an arcing horn 14 attached to the overhead transmission line 4 (arcing horn 14 attached in front of the long trunk insulator 13), and a metal hook 23 of the grounding rod 22 holding the arcing horn 14. and the ground wire 20 connected to the metal hook 23 and the ground terminal 8 to which one end of the ground wire 20 is fixed are electrically connected to the overhead power transmission line 4. The induced current is released (earthed) to the ground via the steel tower 2 . The base end 24 (the end opposite to the tip to which the metal hook 23 is attached) of the ground rod 22 is fixed to the cross arm 3 by a fixing means 25 such as a string, a rope, or an adhesive tape. .

以上のように、本実施例に係る接地板１は、架空送電線４の一端を支持する電線プレート５を腕金３の先端に固定する複数のボルト・ナット６のうちの一対のボルト・ナット６，６を使用して、電線プレート５と共に腕金３の先端に締め付け固定されるようになっているため、腕金３に固定するためのボルト穴を腕金３に新たに穴あけ作業する必要がなく、鉄塔２の腕金３への取付作業を容易に行うことができる。 As described above, the ground plate 1 according to the present embodiment includes a pair of bolts/nuts among a plurality of bolts/nuts 6 for fixing the wire plate 5 supporting one end of the overhead transmission line 4 to the tip of the cross arm 3. 6, 6 are used to fasten and fix to the tip of the cross arm 3 together with the electric wire plate 5, so it is necessary to newly drill a bolt hole in the cross arm 3 for fixing to the cross arm 3. Therefore, the steel tower 2 can be easily attached to the cross arm 3.

（第１変形例）
図２（ｃ）は、第１変形例に係る接地板１の平面図である。この図２（ｃ）に示すように、本変形例に係る接地板１は、一対のボルト・ナット６，６のボルト６ａ，６ａの軸部を係合するボルト穴１１，１１が腕金固定部３に間隔を開けて一対形成されている。ボルト穴１１は、一対のボルト・ナット６，６の配列方向に沿って延びる長穴である。この一対のボルト穴１１，１１の一方は、一対のボルト穴１１，１１の他方の長手方向一端に係合されたボルト６ａの軸部を中心に腕金固定部３が回動させられた際に、ボルト６ａの軸部をボルト穴１１の長手方向一端側に案内するボルト案内溝２６が接続されている。ボルト案内溝２６は、平面視した形状が円弧形状であり、一端が一対のボルト穴１１，１１の一方の長手方向一端側に開口し、他端が腕金固定部７の側方（側辺１６側）に開口している。ボルト穴１１，１１は、ボルト６ａの軸部がボルト案内溝２６に沿ってボルト穴１１の一端側まで移動した後、接地板１が一対のボルト・ナット６，６の配列方向に沿って（前方へ向かって）移動させられると、ボルト６ａの軸部がボルト案内溝２６から外れる長さに形成された長穴である。 (First modification)
FIG. 2(c) is a plan view of the ground plate 1 according to the first modification. As shown in FIG. 2(c), in the grounding plate 1 according to this modified example, bolt holes 11, 11 for engaging the shaft portions of the bolts 6a, 6a of the pair of bolts and nuts 6, 6 are fixed by cross arms. A pair is formed in the portion 3 with an interval therebetween. The bolt hole 11 is an elongated hole extending along the arrangement direction of the pair of bolts and nuts 6 , 6 . One of the pair of bolt holes 11, 11 is closed when the cross arm fixing portion 3 is rotated about the shaft portion of the bolt 6a engaged with the other longitudinal end of the pair of bolt holes 11, 11. is connected to a bolt guide groove 26 for guiding the shaft portion of the bolt 6a to one end in the longitudinal direction of the bolt hole 11. As shown in FIG. The bolt guide groove 26 has an arcuate shape in plan view, one end of which is open at one longitudinal end of the pair of bolt holes 11, 11, and the other end of which is located on the side of the cross arm fixing portion 7 (side edge). 16 side). After the shaft portion of the bolt 6a moves along the bolt guide groove 26 to one end side of the bolt hole 11, the bolt holes 11, 11 move along the arrangement direction of the pair of bolts and nuts 6, 6 ( It is an elongated hole formed with a length such that the shaft portion of the bolt 6a is disengaged from the bolt guide groove 26 when it is moved forward).

このような本変形例に係る接地板１は、一対のボルト穴１１，１１の一方に係合されるボルト６ａがナット６ｂを取り外すことなく（ナット６ｂと腕金３との間に接地板１を挿入する隙間ができる程度にナット６ｂが緩められるだけで）一対のボルト穴１１，１１の一方に係合させることができるため、鉄塔２の腕金３への取付作業を上記実施例に係る接地板１よりも容易に行うことができる。 In the grounding plate 1 according to this modified example, the bolt 6a engaged with one of the pair of bolt holes 11, 11 does not remove the nut 6b (the grounding plate 1 is held between the nut 6b and the arm 3) without removing the nut 6b. Only by loosening the nut 6b to the extent that there is a gap for inserting the steel tower 2, one of the pair of bolt holes 11, 11 can be engaged. It can be done more easily than the ground plate 1 .

（第２変形例）
図２（ｄ）は、第２変形例に係る接地板１の平面図であり、上記第１変形例に係る接地板１の変形例を示す図である。この図２（ｄ）に示すように、本変形例に係る接地板１は、一対のボルト穴１１，１１の他方は、一対のボルト穴１１，１１の一方の長手方向一端に係合されたボルト６ａの軸部を中心に腕金固定部７が回動させられた際に、ボルト６ａの軸部をボルト穴１１の長手方向一端側に案内するボルト案内溝２６が接続されている。このような本変形例に係る接地板１は、上記第１変形例に係る接地板１と同様の効果を得ることができる。 (Second modification)
FIG. 2(d) is a plan view of the grounding plate 1 according to the second modified example, showing a modified example of the grounding plate 1 according to the first modified example. As shown in FIG. 2(d), in the grounding plate 1 according to this modification, the other of the pair of bolt holes 11, 11 is engaged with one longitudinal end of the pair of bolt holes 11, 11. A bolt guide groove 26 is connected to guide the shaft of the bolt 6a to one longitudinal end of the bolt hole 11 when the cross arm fixing portion 7 is rotated about the shaft of the bolt 6a. The ground plate 1 according to this modification can obtain the same effect as the ground plate 1 according to the first modification.

１……接地板（架空送電線作業用接地板）、２……鉄塔、３……腕金、４……架空送電線、５……電線プレート、６……ボルト・ナット、２０……アース線 1……Ground plate (ground plate for overhead transmission line work), 2……Steel tower, 3……Cross arm, 4……Overhead transmission line, 5……Electric wire plate, 6……Bolt and nut, 20……Earth line

Claims (4)

鉄塔の腕金に取り付けられ、架空送電線にアース線を介して接続される架空送電線作業用接地板において、
前記架空送電線の一端を支持する電線プレートを前記腕金の先端に固定する複数のボルト・ナットを使用して、前記電線プレートと共に前記腕金の先端に締め付け固定される、
ことを特徴とする架空送電線作業用接地板。 In the ground plate for overhead transmission line work attached to the cross arm of the steel tower and connected to the overhead transmission line via the ground wire,
A plurality of bolts and nuts are used to fix a wire plate supporting one end of the overhead power transmission line to the tip of the cross arm, and the wire plate is tightened and fixed to the tip of the cross arm.
A grounding plate for overhead transmission line work, characterized by: 前記腕金の外方に張り出す接地端子取付部が形成され、
前記接地端子取付部には、前記アース線の一端を固定する接地端子が取り付けられる、
ことを特徴とする請求項１に記載の架空送電線作業用接地板。 A ground terminal mounting portion projecting outward from the cross arm is formed,
A ground terminal for fixing one end of the ground wire is attached to the ground terminal attachment portion.
The grounding plate for overhead power transmission line work according to claim 1, characterized in that: 前記架空送電線の一端側に配置された電線設置部材との接触を避ける折り曲げ部分が前記接地端子取付部に形成された、
ことを特徴とする請求項２に記載の架空送電線作業用接地板。 A bent portion for avoiding contact with a wire installation member arranged on one end side of the overhead power transmission line is formed in the ground terminal attachment portion,
The grounding plate for overhead power transmission line work according to claim 2, characterized in that: 前記腕金に固定される腕金固定部と前記接地端子取付部とを有し、
前記腕金固定部には、一対のボルト・ナットのボルトの軸部を係合するボルト穴が間隔を開けて一対形成され、
前記ボルト穴は、前記一対のボルト・ナットの配列方向に沿って延びる長穴であり、
一対の前記ボルト穴の一方は、前記一対のボルト穴の他方の長手方向一端に係合された前記ボルトの軸部を中心に前記腕金固定部が回動させられた際に、前記ボルトの軸部を前記ボルト穴の長手方向一端側に案内するボルト案内溝が接続され、
前記ボルト案内溝は、一端が前記一対のボルト穴の一方の長手方向一端側に開口し、他端が前記腕金固定部の側方に開口する、
ことを特徴とする請求項２又は３に記載の架空送電線作業用接地板。 Having a cross arm fixing portion fixed to the cross arm and the ground terminal attachment portion,
A pair of spaced apart bolt holes for engaging the shafts of the bolts of the pair of bolts and nuts are formed in the cross arm fixing portion,
the bolt hole is an elongated hole extending along the direction in which the pair of bolts and nuts are arranged;
One of the pair of bolt holes is adapted to hold the bolt when the cross arm fixing portion is rotated around the shaft portion of the bolt engaged with the other longitudinal end of the pair of bolt holes. A bolt guide groove is connected to guide the shaft to one end in the longitudinal direction of the bolt hole,
One end of the bolt guide groove opens to one longitudinal end of one of the pair of bolt holes, and the other end opens to the side of the cross arm fixing portion.
4. The grounding plate for overhead power transmission line work according to claim 2 or 3, characterized in that:
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006260775A (en) 2005-03-15 2006-09-28 Chugoku Electric Power Co Inc:The Insulator attachment plate and method of mounting insulator
JP2009005547A (en) 2007-06-25 2009-01-08 Chugoku Electric Power Co Inc:The Member for modifying structure, and fitting method thereof

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5811869U (en) * 1981-07-16 1983-01-25 旭電機株式会社 Ground plate protection cover
JP3919899B2 (en) * 1997-09-16 2007-05-30 旭電機株式会社 Grounding plate mounting bracket

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006260775A (en) 2005-03-15 2006-09-28 Chugoku Electric Power Co Inc:The Insulator attachment plate and method of mounting insulator
JP2009005547A (en) 2007-06-25 2009-01-08 Chugoku Electric Power Co Inc:The Member for modifying structure, and fitting method thereof

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