JP2011173139A - Plug structure of inspection hole - Google Patents

Plug structure of inspection hole Download PDF

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JP2011173139A
JP2011173139A JP2010037605A JP2010037605A JP2011173139A JP 2011173139 A JP2011173139 A JP 2011173139A JP 2010037605 A JP2010037605 A JP 2010037605A JP 2010037605 A JP2010037605 A JP 2010037605A JP 2011173139 A JP2011173139 A JP 2011173139A
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inspection hole
plug
pipe
diameter
circumferential direction
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JP5582818B2 (en
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Nobuhiko Saito
伸彦 齋藤
Nobuyoshi Komai
伸好 駒井
Hiroyuki Oyama
博之 大山
Kosei Manabe
幸聖 真鍋
Takumi Tokiyoshi
巧 時吉
Masataka Nakanishi
正孝 仲西
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a plug structure of an inspection hole enabling prolongation of life without forming a slit part. <P>SOLUTION: The plug structure of the inspection hole 2 is inserted into the inspection hole 2 formed at piping 1 and is fixed to the piping 1 by whole-circumference fillet welding to seal the inspection hole 2. A plug 10 includes a plug body 11, an insertion part 12 with a diameter smaller than that of the plug body 11 inserted to the inspection hole 2, and a stepped part 13 with a diameter that reduces from the plug body 11 to the insertion part 12. A stepped area in a piping axis direction that reduces a diameter by forming a stepped face 14 and a tilted area in a piping circumferential direction that reduces a diameter by forming a tilted face 15 are alternately arranged in the circumferential direction of the stepped part 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、たとえば発電用ボイラの蒸気配管全般に適用される点検孔のプラグ構造に関する。   The present invention relates to a plug structure for an inspection hole applied to, for example, steam pipes in general for power generation boilers.

従来、発電用ボイラの蒸気配管には、溶接後に溶接部の非破壊検査を実施するため、配管肉厚を貫通する点検孔が設けられている。この点検孔は、配管内に放射線源を配置して配管外部のフィルムに照射するために設けられたものであり、検査完了後にはプラグを取り付けて封止される。
このような点検孔のプラグ構造（形状）として、たとえば図４及び図５に示すように、配管１側に点検孔２を設けておき、この点検孔２に載置したプラグ３と配管１との間をすみ肉溶接して形成した溶接部４でシール及び固定するものが知られている。 Conventionally, in order to perform a nondestructive inspection of a welded portion after welding, an inspection hole penetrating the pipe wall thickness is provided in a steam pipe of a power generation boiler. This inspection hole is provided in order to irradiate the film outside the piping by arranging a radiation source in the piping, and after the inspection is completed, a plug is attached and sealed.
As such a plug structure (shape) of the inspection hole, for example, as shown in FIGS. 4 and 5, an inspection hole 2 is provided on the pipe 1 side, and the plug 3 and the pipe 1 placed in the inspection hole 2 are provided. What seals and fixes by the weld part 4 formed by fillet-welding between is known.

なお、図４において、左側の周断面は配管１の周方向断面、右側の軸断面は配管１の軸方向断面を示している。
また、下記の特許文献１に開示されているように、配管側にねじ込んだプラグをすみ肉溶接する構造もある。 In FIG. 4, the left circumferential section shows the circumferential section of the pipe 1, and the right axial section shows the axial section of the pipe 1.
In addition, as disclosed in Patent Document 1 below, there is also a structure in which fillet welding is performed on a plug screwed on the pipe side.

特開２００２−１１３５７６号公報（たとえば、図１等を参照）Japanese Patent Laid-Open No. 2002-113576 (see, for example, FIG. 1)

上述した図４のプラグ構造（従来構造）は、点検孔２の周囲となる配管１側の端部に対して、プラグ３側の全周に設けられている段差面３ａを載置した後、全周にわたってすみ肉溶接を行うものであり、乗せかけ型とも呼ばれている。
このため、応力集中部となる溶接部４の内面側には、配管１の外表面との間にスリット部が存在する。このスリット部は、載置したプラグ３の段差面３ａと配管１との面間に僅かな隙間が残り、この隙間まで溶接の溶け込みが完全に行き渡らないために形成されたものである。なお、上述した隙間は、たとえば曲面となる配管１の外周面とプラグ３の接触面（段差面３ａ）との間にある僅かな形状差等により形成されるものであり、特に、曲面の影響が大きくなる配管１の周方向（周断面）側においてスリット部を生じやすい。 The plug structure (conventional structure) shown in FIG. 4 described above, after placing the stepped surface 3a provided on the entire circumference on the plug 3 side with respect to the end portion on the pipe 1 side around the inspection hole 2, Fillet welding is performed over the entire circumference, which is also called the overlay type.
For this reason, a slit part exists between the outer surface of the pipe 1 on the inner surface side of the welded part 4 serving as a stress concentration part. This slit portion is formed so that a slight gap remains between the surface of the stepped surface 3a of the placed plug 3 and the pipe 1, and welding does not completely penetrate to this gap. The above-mentioned gap is formed by a slight shape difference between the outer peripheral surface of the pipe 1 and the contact surface (step surface 3a) of the plug 3, which is a curved surface. The slit portion is likely to be formed on the circumferential direction (circumferential cross section) side of the pipe 1 where the current becomes large.

このようなスリット部には高いピーク応力が発生するので、配管１の点検孔２にすみ肉溶接してプラグ３を固定した溶接部４の寿命が短くなるという問題が生じてくる。すなわち、配管１内を流れる高圧の蒸気は、溶接部４の内側に形成されたスリット部に入り込むので、この蒸気圧によりピーク応力が発生し、溶接部４の寿命が短縮されている。   Since a high peak stress is generated in such a slit portion, there arises a problem that the life of the welded portion 4 in which the plug 3 is fixed by fillet welding to the inspection hole 2 of the pipe 1 is shortened. That is, since the high-pressure steam flowing in the pipe 1 enters the slit portion formed inside the welded portion 4, a peak stress is generated by this vapor pressure, and the life of the welded portion 4 is shortened.

このような背景から、溶接部４のピーク応力を低減して長寿命化するためには、溶接部４にスリット部が形成されることのない、すなわち、溶接部４にスリット部のない点検孔２のプラグ構造が望まれる。
本発明は、上記の事情に鑑みてなされたものであり、その目的とするところは、スリット部が形成されることのない点検孔のプラグ構造を提供して長寿命化することにある。 From such a background, in order to reduce the peak stress of the welded portion 4 and extend the life, no slit portion is formed in the welded portion 4, that is, the inspection hole without the slit portion in the welded portion 4. Two plug structures are desired.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a plug structure of an inspection hole in which a slit portion is not formed, thereby extending the life.

本発明は、上記の課題を解決するため、下記の手段を採用した。
本発明に係る点検孔のプラグ構造は、配管に穿設された点検孔に挿入し、全周のすみ肉溶接により前記配管に固定して前記点検孔を封止する点検孔のプラグ構造において、前記プラグは、プラグ本体と、前記点検孔に挿入される前記プラグ本体より小径の挿入部と、前記プラグ本体から前記挿入部に縮径する段差部とを備え、段差面を形成して縮径する配管軸方向の段差領域と、傾斜面を形成して縮径する配管周方向の傾斜領域とが、前記段差部の円周方向へ交互に設けられていることを特徴とするものである。 In order to solve the above problems, the present invention employs the following means.
The inspection hole plug structure according to the present invention is inserted into an inspection hole drilled in a pipe and fixed to the pipe by fillet welding of the entire circumference to seal the inspection hole. The plug includes a plug main body, an insertion portion having a smaller diameter than the plug main body inserted into the inspection hole, and a stepped portion that reduces the diameter from the plug main body to the insertion portion, and forms a stepped surface to reduce the diameter. The step region in the pipe axis direction to be formed and the inclined region in the pipe circumferential direction to reduce the diameter by forming an inclined surface are alternately provided in the circumferential direction of the step portion.

このような本発明の点検孔のプラグ構造によれば、プラグ本体と、点検孔に挿入されるプラグ本体より小径の挿入部と、プラグ本体から挿入部に縮径する段差部とを備えたプラグとされ、段差面を形成して縮径する配管軸方向の段差領域と、傾斜面を形成して縮径する配管周方向の傾斜領域とが、段差部の円周方向へ交互に設けられているので、配管の外表面との間に形状差を生じやすい配管周方向領域が、配管の外表面端部と線接触をする傾斜領域となる。この結果、プラグと配管との間には隙間が形成されず、しかも、プラグの配管周方向領域に設けた傾斜面がすみ肉溶接による溶接部の溶着量を増加させるので、溶接部にスリット部が生じることを防止する。   According to such a plug structure of the inspection hole of the present invention, a plug including a plug main body, an insertion portion having a smaller diameter than the plug main body inserted into the inspection hole, and a stepped portion reduced in diameter from the plug main body to the insertion portion. The step region in the pipe axis direction that reduces the diameter by forming a step surface and the inclined region in the pipe circumferential direction that forms the inclined surface and reduces the diameter are alternately provided in the circumferential direction of the step portion. Therefore, the pipe circumferential direction region that easily causes a shape difference with the outer surface of the pipe is an inclined region that makes line contact with the outer surface end of the pipe. As a result, no gap is formed between the plug and the pipe, and the inclined surface provided in the pipe circumferential direction region increases the amount of weld welded by fillet welding. Is prevented from occurring.

上記の発明において、前記傾斜領域は、前記段差部の周方向両側にそれぞれ４５度〜１３５度の範囲に設けられていることが好ましく、これにより、配管周方向領域のほとんどまたは全域が配管の外表面端部と線接触をする傾斜領域となり、プラグの溶接時には、配管軸方向の段差面が取付位置に対する位置決めを容易にし、冶具等による位置決め固定が不要になる。   In the above invention, the inclined region is preferably provided in a range of 45 degrees to 135 degrees on both sides in the circumferential direction of the stepped portion, whereby most or all of the pipe circumferential direction region is outside the pipe. It becomes an inclined region in line contact with the surface end, and when the plug is welded, the step surface in the pipe axis direction facilitates positioning with respect to the mounting position, and positioning and fixing with a jig or the like is not required.

上記の発明において、前記傾斜領域を前記段差部の周方向全周にわたって設けることが好ましく、これにより、加工が容易な低コストのプラグ構造により同等のピーク応力低減が可能になる。   In the above invention, it is preferable to provide the inclined region over the entire circumference in the circumferential direction of the stepped portion, whereby an equivalent peak stress can be reduced by a low-cost plug structure that is easy to process.

上述した本発明によれば、段差面を形成して縮径する配管軸方向の段差領域と、傾斜面を形成して縮径する配管周方向の傾斜領域とが段差部の円周方向へ交互に設けられているので、溶接部にスリット部が形成されないようにしてピーク応力を低減し、点検孔のプラグ構造を長寿命化することができる。   According to the present invention described above, the step region in the pipe axis direction that reduces the diameter by forming the step surface and the inclined region in the pipe circumferential direction that forms the inclined surface and reduces the diameter are alternately arranged in the circumferential direction of the step portion. Therefore, it is possible to reduce the peak stress by preventing the slit portion from being formed in the welded portion and to prolong the life of the plug structure of the inspection hole.

本発明に係る点検孔のプラグ構造について、その一実施形態を示す断面図である。It is sectional drawing which shows the one embodiment about the plug structure of the inspection hole which concerns on this invention. 図１に示した点検孔のプラグ構造について、段差面の形成範囲例を示す点検孔の平面図である。It is a top view of the inspection hole which shows the example of the formation range of a level | step difference surface about the plug structure of the inspection hole shown in FIG. 本発明に係る点検孔のプラグ構造について、他の実施形態を示す断面図である。It is sectional drawing which shows other embodiment about the plug structure of the inspection hole which concerns on this invention. 点検孔のプラグ構造に係る従来構造を示す断面図である。It is sectional drawing which shows the conventional structure which concerns on the plug structure of an inspection hole. 発電用ボイラの蒸気配管に取り付けられた点検孔のプラグを示す側面図である。It is a side view which shows the plug of the inspection hole attached to the steam piping of the boiler for electric power generation.

以下、本発明に係る点検孔のプラグ構造について、その一実施形態を図面に基づいて説明する。なお、以下の説明では、発電用ボイラの蒸気配管に設けられる点検孔を封止するプラグ構造について説明するが、これに限定されるものではない。
図１に示す実施形態において、発電用ボイラの蒸気配管である配管１には、配管肉厚を貫通する点検孔２が設けられている。この点検孔２は、平面視が円形の穴である。 Hereinafter, an embodiment of a plug structure for an inspection hole according to the present invention will be described with reference to the drawings. In addition, although the following description demonstrates the plug structure which seals the inspection hole provided in the steam piping of the generator boiler, it is not limited to this.
In the embodiment shown in FIG. 1, an inspection hole 2 that penetrates the pipe thickness is provided in the pipe 1 that is the steam pipe of the power generation boiler. The inspection hole 2 is a circular hole in plan view.

点検孔２に取り付けて封止するプラグ１０は、円筒形状とした本体１１の下端部側に、本体１１より若干小径とした円筒形状の挿入部１２を備えている。この挿入部１２は、配管１に穿設された点検孔２に挿入される部分である。
このようなプラグ１０においては、本体１１から挿入部１２に断面形状を変化（縮径）させる段差部１３が存在する。この段差部１３は、その円周方向において、配管１側の端部に載置される段差面１４が形成された段差領域と、滑らかな傾斜面１５による形状変化をして段差面１４のない傾斜領域とを備えている。 The plug 10 that is attached and sealed to the inspection hole 2 includes a cylindrical insertion portion 12 having a slightly smaller diameter than the main body 11 on the lower end side of the cylindrical main body 11. The insertion portion 12 is a portion that is inserted into the inspection hole 2 formed in the pipe 1.
In such a plug 10, there is a stepped portion 13 that changes (reduces diameter) the cross-sectional shape from the main body 11 to the insertion portion 12. In the circumferential direction, the stepped portion 13 has a stepped region formed with a stepped surface 14 placed on the end portion on the pipe 1 side and a shape change by the smooth inclined surface 15 so that there is no stepped surface 14. And an inclined region.

プラグ１０の段差領域では、本体１１から挿入部１２に段差面１４を形成して縮径している。この段差面１４は、挿入部１２を点検孔２の所定位置に挿入した状態で、点検孔２の周囲に存在する配管１の外表面端部に係止されて面接触する略平面の部分である。
プラグ１０の傾斜領域では、本体１１から挿入部１２まで滑らかな傾斜面１５を形成して縮径しており、従って、段差領域に形成されている段差面１４は存在しない。この傾斜面１５は、その縦断面形状が曲線または直線を描くものであるから、点検孔２の周囲に存在する配管１の外表面端部とは線接触となる。 In the step region of the plug 10, a step surface 14 is formed from the main body 11 to the insertion portion 12 to reduce the diameter. The stepped surface 14 is a substantially flat portion that is brought into surface contact with the outer surface end of the pipe 1 existing around the inspection hole 2 in a state where the insertion portion 12 is inserted into a predetermined position of the inspection hole 2. is there.
In the inclined region of the plug 10, the diameter is reduced by forming a smooth inclined surface 15 from the main body 11 to the insertion portion 12, and therefore there is no step surface 14 formed in the step region. Since this inclined surface 15 has a longitudinal cross-sectional shape that draws a curve or a straight line, it makes line contact with the outer surface end of the pipe 1 existing around the inspection hole 2.

本実施形態において、段差面１４を形成する段差領域は、たとえば図２に示すように、点検孔２の平面視で配管１の軸方向となる領域に設けられている。また、傾斜面１５を形成する傾斜領域は、同じく点検孔２の平面視で配管１の周方向となる領域に設けられている。すなわち、プラグ１０に形成される３６０度の段差部１３に対し、配管軸方向の段差領域と配管周方向の傾斜領域とが交互に設けられている。図示の構成例では、点検孔２の中心位置から軸方向両側に２箇所の段差領域が設けられ、軸方向と直交する周方向両側に２箇所の傾斜領域が設けられている。   In the present embodiment, the step region forming the step surface 14 is provided in a region in the axial direction of the pipe 1 in a plan view of the inspection hole 2, for example, as shown in FIG. 2. In addition, the inclined region that forms the inclined surface 15 is provided in a region that is also in the circumferential direction of the pipe 1 in the plan view of the inspection hole 2. That is, with respect to the step part 13 of 360 degrees formed in the plug 10, a step region in the pipe axis direction and an inclined region in the pipe circumferential direction are provided alternately. In the illustrated configuration example, two step regions are provided on both sides in the axial direction from the center position of the inspection hole 2, and two inclined regions are provided on both sides in the circumferential direction orthogonal to the axial direction.

図２に示す構成例では、平面視で円形となる点検孔２に対しプラグ１０が所定位置に挿入して取り付けられた状態において、配管軸方向の段差領域と配管周方向の傾斜領域とが略９０度ピッチで交互に設けられている。しかし、傾斜領域を設ける好適な周方向の範囲は４５度〜１３５度であり、従って、たとえば配管１の径や点検孔２の径（すなわちプラグ１０の径）等の諸条件に応じて適宜最適値を選択すればよい。すなわち、本実施形態のプラグ１０は、配管１の外表面との間に形状差を生じやすい配管周方向領域が、配管１の外表面端部と線接触をする傾斜領域となっている。なお、上述した傾斜領域の角度は、周方向の軸線から両方向へ均等に振り分けることが望ましい。   In the configuration example shown in FIG. 2, the step region in the pipe axis direction and the inclined region in the pipe circumferential direction are substantially in a state where the plug 10 is inserted and attached to the inspection hole 2 that is circular in plan view. They are provided alternately at a pitch of 90 degrees. However, the preferred circumferential range in which the inclined region is provided is 45 to 135 degrees, and is therefore optimally appropriate depending on various conditions such as the diameter of the pipe 1 and the diameter of the inspection hole 2 (that is, the diameter of the plug 10). Select a value. That is, in the plug 10 of the present embodiment, the pipe circumferential direction region that easily causes a shape difference with the outer surface of the pipe 1 is an inclined region that makes line contact with the outer surface end of the pipe 1. Note that it is desirable that the angles of the above-described inclined regions are equally distributed in both directions from the circumferential axis.

このような段差部１３を有するプラグ１０は、点検孔２の所定位置に挿入して周囲をすみ肉溶接した溶接部４を形成すると、曲面の影響が大きい配管周方向領域において、段差面１４がなく配管１の外表面端部と線接触している。このため、プラグ１０と配管１の外表面との間に隙間が形成されることを防止でき、しかも、プラグ１０の配管周方向領域に傾斜面１５を設けることにより溶着量が増加するので、結果として溶接部４にスリット部が形成されることを防止できる。従って、溶接部４に発生するピーク応力を低減し、プラグ１０をすみ肉溶接により固定するプラグ構造を長寿命化することができる。   When the plug 10 having such a stepped portion 13 is inserted into a predetermined position of the inspection hole 2 to form the welded portion 4 in which the periphery is fillet welded, the stepped surface 14 is formed in the pipe circumferential direction region where the influence of the curved surface is large. There is no line contact with the outer surface end of the pipe 1. For this reason, it is possible to prevent a gap from being formed between the plug 10 and the outer surface of the pipe 1, and the amount of welding is increased by providing the inclined surface 15 in the pipe circumferential direction region. As a result, it is possible to prevent the slit portion from being formed in the welded portion 4. Therefore, the peak stress generated in the welded portion 4 can be reduced, and the life of the plug structure that fixes the plug 10 by fillet welding can be extended.

また、上述したプラグ１０は、段差面１４が形成された段差領域と、滑らかな傾斜面１５が形成された傾斜領域とを備えているので、プラグ１０の溶接時には、配管軸方向の段差面１４が所定の取付位置に対する位置決めを容易にし、しかも、冶具等による位置決め固定を不要にする。
なお、プラグ１０には内部穴１６を設けておくことが好ましく、これにより、溶接時の収縮応力を低減することができる。 Further, since the plug 10 described above includes a step region in which the step surface 14 is formed and an inclined region in which the smooth inclined surface 15 is formed, when the plug 10 is welded, the step surface 14 in the pipe axis direction is provided. Facilitates positioning with respect to a predetermined mounting position and eliminates the need for positioning and fixing with a jig or the like.
In addition, it is preferable to provide the internal hole 16 in the plug 10, and this can reduce the shrinkage stress at the time of welding.

次に、本発明に係るプラグ構造について、他の実施形態を図３に基づいて説明する。なお、上述した実施形態と同様の部分には同じ符号を付し、その詳細な説明は省略する。
この実施形態では、プラグ１０Ａの段差部１３Ａが、全周にわたって傾斜面１５を形成した傾斜領域となる。従って、この場合の段差部１３Ａには段差面１４を備えた段差領域がなく、配管１の外表面端部と全周にわたって線接触する構造となっている。 Next, another embodiment of the plug structure according to the present invention will be described with reference to FIG. In addition, the same code | symbol is attached | subjected to the part similar to embodiment mentioned above, and the detailed description is abbreviate | omitted.
In this embodiment, the step portion 13A of the plug 10A is an inclined region in which the inclined surface 15 is formed over the entire circumference. Accordingly, the stepped portion 13A in this case does not have a stepped region having the stepped surface 14, and has a structure in line contact with the outer surface end of the pipe 1 over the entire circumference.

このような段差部１３Ａを有するプラグ１０Ａは、点検孔２の所定位置に挿入して周囲をすみ肉溶接した溶接部４を形成すると、段差面１４がないため、全周にわたって配管１の外表面端部と線接触している。このため、プラグ１０Ａと配管１の外表面との間に隙間が形成されることを防止でき、しかも、プラグ１０Ａの全周にわたって設けた傾斜面１５により溶着量が増加するので、結果として溶接部４にスリット部が形成されることを防止できる。従って、溶接部４に発生するピーク応力を低減し、プラグ１０をすみ肉溶接により固定するプラグ構造を長寿命化することができる。   When the plug 10A having such a stepped portion 13A is inserted into a predetermined position of the inspection hole 2 to form the welded portion 4 in which the periphery is fillet welded, there is no stepped surface 14, and therefore the outer surface of the pipe 1 over the entire circumference. It is in line contact with the edge. For this reason, it is possible to prevent a gap from being formed between the plug 10A and the outer surface of the pipe 1, and the amount of welding is increased by the inclined surface 15 provided over the entire circumference of the plug 10A. It can prevent that a slit part is formed in 4. FIG. Therefore, the peak stress generated in the welded portion 4 can be reduced, and the life of the plug structure that fixes the plug 10 by fillet welding can be extended.

このように構成したプラグ１０Ａは、段差部１３Ａの形状が単純化するため、製造が容易になってコストの低減に有効である。なお、ボイラの蒸気配管においては、多数のプラグ１０Ａが必要となるので、プラグ１０Ａの低コストかはボイラ全体のコスト低減に有効である。   The plug 10A configured in this manner is simplified in the shape of the stepped portion 13A, so that it is easy to manufacture and effective in reducing the cost. In addition, since many plugs 10A are required in the steam piping of the boiler, whether the cost of the plug 10A is low is effective in reducing the cost of the entire boiler.

このように、上述した本発明の実施形態によれば、段差面１３を形成して縮径する配管軸方向の段差領域と、傾斜面１５を形成して縮径する配管周方向の傾斜領域とが段差部１３の円周方向へ交互に設けられているので、溶接部４にスリット部が形成されないようにしてピーク応力を低減し、点検孔２のプラグ構造を長寿命化することができる。
なお、本発明は上述した実施形態に限定されることはなく、その要旨を逸脱しない範囲内において適宜変更することができる。 Thus, according to the above-described embodiment of the present invention, the step region in the pipe axis direction that reduces the diameter by forming the step surface 13, and the inclined region in the pipe circumferential direction that forms the inclined surface 15 and reduces the diameter, Are alternately provided in the circumferential direction of the stepped portion 13, the peak stress can be reduced so that the slit portion is not formed in the welded portion 4, and the plug structure of the inspection hole 2 can be extended.
In addition, this invention is not limited to embodiment mentioned above, In the range which does not deviate from the summary, it can change suitably.

１ 配管
２ 点検孔
４ 溶接部
１０，１０Ａ プラグ
１１ 本体
１２ 挿入部
１３，１３Ａ 段差部
１４ 段差面
１５ 傾斜面
DESCRIPTION OF SYMBOLS 1 Piping 2 Inspection hole 4 Welding part 10,10A Plug 11 Main body 12 Insertion part 13,13A Step part 14 Step surface 15 Inclined surface

Claims (3)

配管に穿設された点検孔に挿入し、全周のすみ肉溶接により前記配管に固定して前記点検孔を封止する点検孔のプラグ構造において、
前記プラグは、プラグ本体と、前記点検孔に挿入される前記プラグ本体より小径の挿入部と、前記プラグ本体から前記挿入部に縮径する段差部とを備え、
段差面を形成して縮径する配管軸方向の段差領域と、傾斜面を形成して縮径する配管周方向の傾斜領域とが、前記段差部の円周方向へ交互に設けられていることを特徴とする点検孔のプラグ構造。 In the plug structure of the inspection hole, which is inserted into the inspection hole drilled in the pipe and fixed to the pipe by fillet welding of the entire circumference, and the inspection hole is sealed,
The plug includes a plug main body, an insertion portion having a smaller diameter than the plug main body inserted into the inspection hole, and a stepped portion reduced in diameter from the plug main body to the insertion portion.
Step regions in the pipe axis direction that reduce the diameter by forming step surfaces and inclined regions in the pipe circumferential direction that reduce the diameter by forming inclined surfaces are alternately provided in the circumferential direction of the step portions. The inspection hole plug structure. 前記傾斜領域が、前記段差部の周方向両側にそれぞれ４５度〜１３５度の範囲に設けられていることを特徴とする請求項１に記載の点検孔のプラグ構造。   2. The inspection hole plug structure according to claim 1, wherein the inclined region is provided in a range of 45 degrees to 135 degrees on both sides in the circumferential direction of the stepped portion. 前記傾斜領域が前記段差部の周方向全周にわたって設けられていることを特徴とする請求項１に記載の点検孔のプラグ構造。
The inspection hole plug structure according to claim 1, wherein the inclined region is provided over the entire circumference in the circumferential direction of the stepped portion.
JP2010037605A 2010-02-23 2010-02-23 Inspection hole plug structure Expired - Fee Related JP5582818B2 (en)

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Cited By (4)

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Publication number Priority date Publication date Assignee Title
JP2013163202A (en) * 2012-02-10 2013-08-22 Mitsubishi Heavy Ind Ltd Structure for mounting plug member
WO2021157163A1 (en) * 2020-02-07 2021-08-12 三菱パワー株式会社 Plug, steam pipe structure, and method for installing plug
WO2021157141A1 (en) * 2020-02-07 2021-08-12 三菱パワー株式会社 Thermometer protective cylinder, temperature measurement instrument, steam pipe structure, and method for installing thermometer protective cylinder
WO2022239682A1 (en) * 2021-05-14 2022-11-17 三菱重工業株式会社 Plug, pipe structure, and plug installation method

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JPS5548493A (en) * 1978-10-02 1980-04-07 Hitachi Ltd Groove for branch pipe welding
JPH02117492U (en) * 1989-03-07 1990-09-20
JPH07204843A (en) * 1994-01-17 1995-08-08 Babcock Hitachi Kk Welding structure for stub tube and header part using the same
JP2002113576A (en) * 2000-10-10 2002-04-16 Babcock Hitachi Kk Fillet welding structure

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Publication number Priority date Publication date Assignee Title
JPS5548493A (en) * 1978-10-02 1980-04-07 Hitachi Ltd Groove for branch pipe welding
JPH02117492U (en) * 1989-03-07 1990-09-20
JPH07204843A (en) * 1994-01-17 1995-08-08 Babcock Hitachi Kk Welding structure for stub tube and header part using the same
JP2002113576A (en) * 2000-10-10 2002-04-16 Babcock Hitachi Kk Fillet welding structure

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013163202A (en) * 2012-02-10 2013-08-22 Mitsubishi Heavy Ind Ltd Structure for mounting plug member
WO2021157163A1 (en) * 2020-02-07 2021-08-12 三菱パワー株式会社 Plug, steam pipe structure, and method for installing plug
WO2021157141A1 (en) * 2020-02-07 2021-08-12 三菱パワー株式会社 Thermometer protective cylinder, temperature measurement instrument, steam pipe structure, and method for installing thermometer protective cylinder
JP2021122851A (en) * 2020-02-07 2021-08-30 三菱パワー株式会社 Plug, steam pipe structure and plug installation method
JP2021124452A (en) * 2020-02-07 2021-08-30 三菱パワー株式会社 Thermometer protection cylinder, temperature measurement tool, steam piping structure, and installation method of thermometer protection cylinder
WO2022239682A1 (en) * 2021-05-14 2022-11-17 三菱重工業株式会社 Plug, pipe structure, and plug installation method

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