JP2006312172A - Method for manufacturing metal coated steel pipe - Google Patents

Method for manufacturing metal coated steel pipe Download PDF

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JP2006312172A
JP2006312172A JP2005134817A JP2005134817A JP2006312172A JP 2006312172 A JP2006312172 A JP 2006312172A JP 2005134817 A JP2005134817 A JP 2005134817A JP 2005134817 A JP2005134817 A JP 2005134817A JP 2006312172 A JP2006312172 A JP 2006312172A
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steel pipe
metal plate
steel
coated
coated metal
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JP4577648B2 (en
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Masanobu Okamoto
政信 岡本
Hideaki Yuki
英昭 幸
Takayuki Kamimura
隆之 上村
Kazuhiro Ogawa
和博 小川
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Nippon Steel Corp
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Sumitomo Metal Industries Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a metal coated steel pipe, which method can comparatively easily coat and fix a thin coating metallic sheet on a steel pipe. <P>SOLUTION: The coating metallic sheet 3 having a steel band is preliminarily manufactured by attaching the first steel band 5 having a thickness larger than that of a coating metallic sheet 4 to the end portion of the coating metallic sheet 4. The coating metallic sheet 3 having the steel band is coated on the steel pipe 2 by winding it around the steel pipe 2 in such a manner that the first steel band 5 is arranged in the circumferential direction of the steel pipe 2, and then the end portion of the first steel band 5 is welded on the steel pipe 2. Because the portion to be welded to the steel pipe 2 is the end portion of the steel band 5 and its thickness is larger than that of the coating metallic sheet 4, the burn-through in welding can be prevented, and the coating metallic sheet 4 can be comparatively easily wound and fixed on the steel pipe 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、鋼管にステンレスなどの耐食性金属を被覆した金属被覆鋼管の製造方法に係り、特に、港湾建設や河川改修に際して用いられる鋼管杭に適する防食性の金属被覆鋼管の製造方法に関する。   The present invention relates to a method of manufacturing a metal-coated steel pipe in which a steel pipe is coated with a corrosion-resistant metal such as stainless steel, and more particularly to a method of manufacturing a corrosion-resistant metal-coated steel pipe suitable for a steel pipe pile used for harbor construction or river repair.

従来、港湾建設や河川改修に際して用いられる鋼管杭は、腐食環境が厳しい飛沫帯部を、ウレタンやポリエチレンで被覆したいわゆる重防食鋼管杭が用いられている。しかし、これらの鋼管杭と被覆材との接着面は経年劣化して被覆材の剥離が発生するため、防食鋼管杭としての耐久性に問題がある。そこで、防食鋼管杭の耐久性を改善するために、ステンレスやチタン等の耐食性金属の薄板を鋼管杭に被覆した金属被覆防食鋼管杭が提供されている。この金属被覆防食鋼管杭の製造方法としては、薄板状の耐食性金属を被覆金属板として鋼管杭に被覆し、この被覆金属板の端部を鋼管杭に溶接で固定する方法がある（例えば、特許文献１参照）。   Conventionally, as steel pipe piles used for harbor construction and river repair, so-called heavy anticorrosive steel pipe piles in which a splash zone having a severe corrosive environment is covered with urethane or polyethylene are used. However, since the adhesion surface between these steel pipe piles and the covering material deteriorates over time and the peeling of the covering material occurs, there is a problem in durability as a corrosion-resistant steel pipe pile. Therefore, in order to improve the durability of the corrosion-resistant steel pipe pile, a metal-coated corrosion-resistant steel pipe pile in which a steel pipe pile is coated with a thin plate of a corrosion-resistant metal such as stainless steel or titanium is provided. As a manufacturing method of this metal-coated anticorrosion steel pipe pile, there is a method in which a thin plate-like corrosion-resistant metal is coated on a steel pipe pile as a coated metal plate, and an end portion of this coated metal plate is fixed to the steel pipe pile by welding (for example, patent) Reference 1).

特開平９−１７４１４９号公報JP-A-9-174149

しかしながら、一般的に薄板状の被覆金属板を鋼管に溶接する場合、次の間題がある。
（１）溶接時に被覆金属板に熱が蓄積されやすく、溶け落ちによる溶接不良が発生しやすい。
（２）上記（１）の溶け落ちを防止するためには、溶接部で被覆金属板と相手方の鋼管との密着性を確保し、被覆金属板の熱が速やかに相手方の鋼管に拡散させる必要がある。しかし、被覆金属板と鋼管との密着性を確保するためには特別な押さえ治具が必要となり、溶接作業が非常に困難となる。特に、被覆金属板を鋼管の周方向に溶接する場合、曲面上を溶接することになり、困難の度合いが大きい。
これらの問題に対処するために、上記特許文献１にはインダイレクトシーム溶接による被覆金属板の溶接方法が示されている。しかしながら、この場合、専用の装置が必要となり、他の溶接方法の適用が困難である。また、適切な加圧下で行なう必要があること、隙間腐食防止の観点から被覆金属板の端部の気密性を確保するためには、別途ＴＩＧ溶接等の処理が必要であること、など溶接作業が煩雑となる。 However, in general, when a thin plate-like coated metal plate is welded to a steel pipe, there are the following problems.
(1) Heat is likely to be accumulated in the coated metal plate during welding, and poor welding due to melting is likely to occur.
(2) In order to prevent the above (1) from being burned out, it is necessary to secure the adhesion between the coated metal plate and the counterpart steel pipe at the welded portion, and to quickly diffuse the heat of the coated metal plate to the counterpart steel pipe. There is. However, a special holding jig is required to secure the adhesion between the coated metal plate and the steel pipe, and the welding operation becomes very difficult. In particular, when the coated metal plate is welded in the circumferential direction of the steel pipe, the curved surface is welded, and the degree of difficulty is large.
In order to cope with these problems, Patent Document 1 discloses a method for welding a coated metal plate by indirect seam welding. However, in this case, a dedicated device is required, and it is difficult to apply other welding methods. In addition, welding operations such as the need to carry out under appropriate pressure and the need for a separate treatment such as TIG welding to ensure the airtightness of the end of the coated metal plate from the viewpoint of preventing crevice corrosion Becomes complicated.

本発明は、上記事情に鑑みてなされたもので、比較的容易に薄板状の被覆金属板を鋼管に被覆固定できる金属被覆鋼管の製造方法を提供することを目的とする   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for manufacturing a metal-coated steel pipe that can relatively easily coat and fix a thin plate-like coated metal sheet to a steel pipe.

上記目的を達成するために、請求項１に記載の発明は、薄板状の被覆金属板を鋼管に被覆して金属被覆鋼管を製造する金属被覆鋼管の製造方法において、
前記被覆金属板の少なくとも一方の端部に予め該被覆金属板より厚い第１の帯鋼を取り付けることによって帯鋼付き被覆金属板を製造しておき、
この帯鋼付き被覆金属板を、その第１の帯鋼が前記鋼管の周方向に沿うようにして、前記鋼管に巻き付けて被覆し、前記第１の帯鋼の端部を前記鋼管に溶接することを特徴とする。 In order to achieve the above object, the invention according to claim 1 is a method for producing a metal-coated steel pipe, in which a thin-plate-like coated metal plate is coated on a steel pipe to produce a metal-coated steel pipe.
A coated metal plate with a steel strip is manufactured by attaching a first steel strip thicker than the coated metal plate in advance to at least one end of the coated metal plate,
The coated metal plate with the steel strip is wrapped around the steel pipe so that the first steel strip is along the circumferential direction of the steel pipe, and the end of the first steel strip is welded to the steel pipe. It is characterized by that.

請求項１に記載の発明においては、被覆金属板の少なくとも一方の端部に、予め被覆金属板より厚い第１の帯鋼を溶接等で取り付ける。この段階では、被覆金属板は平板状であるため、第１の帯鋼の取り付けは容易に行なえる。この帯鋼付き被覆金属板を、その第１の帯鋼が前記鋼管の周方向に沿うようにして、前記鋼管に巻き付けて被覆し、前記第１の帯鋼の端部を前記鋼管に溶接することにより、金属被覆鋼管を製造する。鋼管に溶接されるのは第１の帯鋼の端部であり、その厚みは被覆金属板よりも厚いため、容易に溶接時の溶け落ちを防止できる。
一度、被覆金属板が端部で鋼管の周方向に固定されると、その後、鋼管の軸方向については、被覆金属板を直接重ねて直線上を溶接することになり、この溶接は比較的容易に可能である。
したがって、比較的容易に薄板状の被覆金属板を鋼管に被覆固定できる。 In the first aspect of the invention, the first strip steel thicker than the coated metal plate is attached to at least one end of the coated metal plate in advance by welding or the like. At this stage, since the coated metal plate has a flat plate shape, the first band steel can be easily attached. The coated metal plate with the steel strip is wrapped around the steel pipe so that the first steel strip is along the circumferential direction of the steel pipe, and the end of the first steel strip is welded to the steel pipe. Thus, a metal-coated steel pipe is manufactured. What is welded to the steel pipe is the end of the first steel strip, and its thickness is thicker than that of the coated metal plate, so that it can be easily prevented from being melted during welding.
Once the coated metal plate is fixed at the end in the circumferential direction of the steel pipe, then, in the axial direction of the steel pipe, the coated metal plate is directly overlapped and welded on a straight line, and this welding is relatively easy Is possible.
Therefore, it is possible to coat and fix the thin plate-like coated metal plate to the steel pipe relatively easily.

請求項２に記載の発明は、請求項１に記載の金属被覆鋼管の製造方法おいて、
前記帯鋼付き被覆金属板を前記鋼管に巻き付ける際の、前記被覆金属板の鋼管への巻き始めとなる巻始め端部に、予め前記被覆金属板より厚い第２の帯鋼を取り付けておき、
この第２の帯鋼を前記鋼管に溶接固定して前記帯鋼付き被覆金属板を前記鋼管に巻き付けた後、前記被覆金属板の鋼管への巻き終りとなる巻終り端部を、前記第２の帯鋼または前記被覆金属板に溶接固定することを特徴とする。 Invention of Claim 2 is the manufacturing method of the metal-coated steel pipe of Claim 1,
At the time of winding the coated metal plate with the steel strip around the steel pipe, a second steel strip thicker than the coated metal plate is attached in advance to the winding start end portion of the coated metal plate to be wound around the steel pipe,
After the second steel strip is welded and fixed to the steel pipe and the coated metal plate with the steel strip is wound around the steel pipe, the winding end portion that is the end of the winding of the coated metal plate around the steel pipe is defined as the second steel strip. It is characterized by being welded and fixed to the steel strip or the coated metal plate.

請求項２に記載の発明においては、被覆金属板の巻始め端部の第２の帯鋼を鋼管に溶接固定して前記帯鋼付き被覆金属板を鋼管に巻き付けた後、被覆金属板の巻終り端部を、第２の帯鋼または前記被覆金属板に溶接固定するので、帯鋼付き被覆金属板の管軸方向の重ね部を容易かつ確実に鋼管に固定できる。   In the second aspect of the invention, the second steel strip at the winding start end of the coated metal plate is welded and fixed to the steel pipe, and the coated metal plate with the steel strip is wound around the steel pipe, and then the winding of the coated metal plate is performed. Since the end portion is welded and fixed to the second steel strip or the coated metal plate, the overlapping portion in the tube axis direction of the coated metal plate with the steel strip can be easily and reliably fixed to the steel pipe.

請求項３に記載の発明は、請求項２に記載の金属被覆鋼管の製造方法において、
前記被覆金属板の巻終り端部に予め該被覆金属板より厚い第３の帯鋼を取り付けておき、
前記帯鋼付き被覆金属板を前記鋼管に巻き付けた後、前記第３の帯鋼を前記第２の帯鋼に重ねて溶接固定することを特徴とする。 Invention of Claim 3 in the manufacturing method of the metal-coated steel pipe of Claim 2,
A third steel strip thicker than the coated metal plate is attached in advance to the end of winding of the coated metal plate,
After the coated steel plate with the steel strip is wound around the steel pipe, the third steel strip is overlapped with the second steel strip and fixed by welding.

請求項３に記載の発明においては、帯鋼付き被覆金属板を鋼管に巻き付けた後、第３の帯鋼を第２の帯鋼に重ねて溶接固定するので、帯鋼付き被覆金属板の管軸方向の重ね部をさらに容易かつ確実に鋼管に固定できる。   In the third aspect of the invention, the third metal strip is overlapped on the second steel strip and welded and fixed after the metal strip with the steel strip is wound around the steel pipe. The overlapping portion in the axial direction can be more easily and reliably fixed to the steel pipe.

請求項４に記載の発明は、請求項１〜請求項３のいずれかに記載の金属被覆鋼管の製造方法において、
前記帯鋼付き被覆金属板を前記鋼管の軸方向に複数溶接固定するに際し、
前記鋼管の軸方向に隣り合う被覆金属板のうち、一方の被覆金属板に取り付けられている第１帯鋼を、他方の被覆金属板に取り付けられている第１帯鋼に重ね合わせて溶接するか、または、他方の被覆金属板の前記第１帯鋼が取り付けられていない端部を前記一方の被覆金属板の端部またはこの端部に取り付けられている第１帯鋼に溶接することを特徴とする。 Invention of Claim 4 in the manufacturing method of the metal-coated steel pipe in any one of Claims 1-3,
When fixing a plurality of the coated metal plates with the steel strip in the axial direction of the steel pipe,
Of the coated metal plates adjacent to each other in the axial direction of the steel pipe, the first steel strip attached to one coated metal plate is overlapped and welded to the first steel strip attached to the other coated metal plate. Or welding the end of the other coated metal plate to which the first steel strip is not attached to the end of the one coated metal plate or the first steel strip attached to this end. Features.

請求項４に記載の発明においては、帯鋼付き被覆金属板の鋼管軸方向への被覆長を伸ばす際に、鋼管軸方向に隣り合う、被覆金属板どうしを容易かつ確実に接合できる。
また、他方の被覆金属板の前記第１帯鋼が取り付けられていない端部を前記一方の被覆金属板の端部またはこの端部に取り付けられている第１帯鋼に溶接する場合、他方の被覆金属板の両端部のうち一方の端部には第１帯鋼を取り付けずにすむので、その分経済的である。
さらに、他方の被覆金属板の前記第１帯鋼が取り付けられていない端部を前記一方の被覆金属板の端部に取り付けられている第１帯鋼に溶接する場合、隣り合う被覆金属板がほぼ面一に配置され、段差が生じることがない。 In invention of Claim 4, when extending | stretching the coating length to the steel pipe axial direction of the covering metal plate with a strip steel, the covering metal plates adjacent to a steel pipe axial direction can be joined easily and reliably.
Further, when welding the end of the other coated metal plate to which the first steel strip is not attached to the end of the one coated metal plate or the first steel strip attached to this end, Since it is not necessary to attach the first steel strip to one of the both ends of the coated metal plate, it is economical to that extent.
Furthermore, when welding the edge part to which the said 1st strip steel of the other covering metal plate is not attached to the 1st steel strip attached to the edge part of said one covering metal plate, the adjacent covering metal plate is Almost flush with each other and no step is generated.

本発明の金属被覆鋼管の製造方法によれば、鋼管に溶接されるのは帯鋼の端部であり、その厚みは被覆金属板よりも厚いため、容易に溶接時の溶け落ちを防止できる。したがって、比較的容易に薄板状の被覆金属板を鋼管に被覆固定できる。
また、製作時の溶接突起が外面に存在するスパイラル鋼管を用いて金属被覆防食鋼管を製造する場合、薄板状の被覆金属板の溶接取り付けが困難になるが、これに対しては、被覆金属板に取り付けられた帯鋼に対応する部位のスパイラル鋼管の外面上の突起を切削すれば、薄板状の被覆金属板を鋼管に被覆固定できる。
さらに、帯鋼付き被覆金属板の鋼管軸方向への被覆長を伸ばす際に、鋼管軸方向に隣り合う、被覆金属板どうしを容易かつ確実に接合できる。 According to the method for manufacturing a metal-clad steel pipe of the present invention, the end of the steel strip is welded to the steel pipe, and the thickness thereof is thicker than that of the coated metal plate. Therefore, it is possible to coat and fix the thin plate-like coated metal plate to the steel pipe relatively easily.
In addition, when manufacturing metal-coated anticorrosion steel pipes using spiral steel pipes with weld projections on the outer surface at the time of production, it is difficult to weld and attach thin-plate-like coated metal sheets. By cutting the protrusion on the outer surface of the spiral steel pipe corresponding to the steel strip attached to the steel plate, a thin plate-like coated metal plate can be covered and fixed to the steel pipe.
Furthermore, when extending the coating length in the steel pipe axial direction of the coated metal plate with the steel strip, the coated metal plates adjacent in the steel pipe axial direction can be joined easily and reliably.

以下、図面を参照して本発明の実施の形態について説明する。
図１は、本発明の実施の形態に係る金属被覆鋼管の製造方法を説明するもので、金属被覆鋼管１を構成する鋼管２に帯鋼付き被覆金属板３を巻き付けている状態を示す概略斜視図、図２は鋼管２の端部を示す断面図である。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 illustrates a method for manufacturing a metal-coated steel pipe according to an embodiment of the present invention, and is a schematic perspective view showing a state in which a coated metal plate 3 with a steel strip is wound around a steel pipe 2 constituting the metal-coated steel pipe 1. FIG. 2 is a cross-sectional view showing the end of the steel pipe 2.

図１および図２に示すように、被覆金属板４の両端部には、予め該被覆金属板４より厚い第１の帯鋼５，５が取り付けられており、これによって、帯鋼付き被覆金属板３が製造されている。
前記被覆金属板４は、例えば厚さ０．４ｍｍのステンレスシートで形成されており、その両端部に、帯鋼５，５がＴＩＧ溶接によって取り付けられている。帯鋼５，５は、例えば厚さ１．０ｍｍである。
また、鋼管２は鋼管杭として使用されているものであり、外径が例えば１０００ｍｍとなっている。 As shown in FIGS. 1 and 2, first strip steels 5 and 5 thicker than the coated metal plate 4 are attached to both ends of the coated metal plate 4 in advance, whereby the coated metal with the strip steel is obtained. A plate 3 is manufactured.
The coated metal plate 4 is formed of, for example, a stainless steel sheet having a thickness of 0.4 mm, and band steels 5 and 5 are attached to both ends thereof by TIG welding. The steel strips 5 and 5 have a thickness of 1.0 mm, for example.
Moreover, the steel pipe 2 is used as a steel pipe pile, and the outer diameter is 1000 mm, for example.

そして、上記のような帯鋼付き被覆金属板３を、その第１の帯鋼５，５が鋼管２の周方向に沿うようにして、該鋼管２に巻き付けて被覆し、第１の帯鋼５，５の端部を鋼管２にＴＩＧ溶接して固定する。
なお、図１および図２において、符号６は、被覆金属板４の両端部に帯鋼５，５をＴＩＧ溶接した際の溶接ビード、符号７は帯鋼５，５の端部を鋼管２にＴＩＧ溶接した際の溶接ビードである。 Then, the above-described coated metal plate 3 with the steel strip is wrapped around the steel pipe 2 so that the first steel strips 5 and 5 are along the circumferential direction of the steel pipe 2, and the first steel strip is covered. The ends of 5 and 5 are fixed to the steel pipe 2 by TIG welding.
1 and 2, reference numeral 6 denotes a weld bead when the steel strips 5 and 5 are TIG welded to both ends of the coated metal plate 4, and reference numeral 7 denotes the end of the steel strips 5 and 5 to the steel pipe 2. It is a weld bead at the time of TIG welding.

上記のようにして、鋼管２に帯鋼付き被覆金属板３を被覆した後、図３（ａ），（ｂ）に示すように、帯鋼付き被覆金属板３の端部どうしを重ね合わせて、鋼管２の軸方向に沿って溶接固定する。その場合、被覆金属板４の鋼管２への巻き始めとなる巻始め端部４ａに、被覆金属板４の鋼管２への巻き終りとなる巻終り端部４ｂを重ね合わせて、ＴＩＧ溶接する。符号８はその際の溶接ビードである。   After the steel pipe 2 is covered with the coated metal plate 3 with the steel strip as described above, the ends of the coated metal plate 3 with the steel strip are overlapped as shown in FIGS. 3 (a) and 3 (b). The steel pipe 2 is fixed by welding along the axial direction. In that case, the winding end portion 4b that is the end of winding of the coated metal plate 4 on the steel pipe 2 is superimposed on the winding start end portion 4a that is the winding start of the coated metal plate 4 on the steel tube 2, and TIG welding is performed. Reference numeral 8 denotes a weld bead at that time.

このような金属被覆鋼管の製造方法にあっては、被覆金属板４の両端部に、第１の帯鋼５，５を溶接等で取り付ける段階では、被覆金属板４は平板状であるため、第１の帯鋼５，５の取り付けは容易に行なえる。そしてこの帯鋼付き被覆金属板３を、鋼管２に巻き付けて被覆し、第１の帯鋼５，５の端部を鋼管２に溶接するが、鋼管２に溶接されるのは第１の帯鋼５，５の端部であり、その厚みは被覆金属板４よりも厚いため、容易に溶接時の溶け落ちを防止できる。そして、一度、被覆金属板４が端部で鋼管２の周方向に固定されると、その後、鋼管２の軸方向については、被覆金属板４を直接重ねて直線上を溶接することになり、この溶接は比較的容易に可能である。したがって、比較的容易に薄板状の被覆金属板４を鋼管２に被覆固定できる。   In such a method of manufacturing a metal-coated steel pipe, at the stage where the first steel strips 5 and 5 are attached to both ends of the coated metal plate 4 by welding or the like, the coated metal plate 4 is flat. The first steel strips 5 and 5 can be easily attached. The coated steel plate 3 with the steel strip is wrapped around the steel pipe 2 and covered, and the ends of the first steel strips 5 and 5 are welded to the steel pipe 2. Since it is the edge part of steel 5 and 5 and the thickness is thicker than the covering metal plate 4, the melt-down at the time of welding can be prevented easily. And once the coated metal plate 4 is fixed in the circumferential direction of the steel pipe 2 at the end, then, in the axial direction of the steel pipe 2, the coated metal plate 4 is directly overlapped and welded on a straight line, This welding is relatively easy. Therefore, the thin coated metal plate 4 can be coated and fixed to the steel pipe 2 relatively easily.

また、鋼管２に帯鋼付き被覆金属板３を被覆した後、帯鋼付き被覆金属板３の端部どうしを重ね合わせて、鋼管２の軸方向に沿って溶接固定するには、以下のようにして行ってもよい。
すなわち、まず、図４（ａ）に示すように、帯鋼付き被覆金属板３を鋼管２に巻き付ける際の、被覆金属板４の鋼管２への巻き始めとなる巻始め端部４ａに、予め被覆金属板４より厚い第２の帯鋼１０を取り付けておく。
そして、第２の帯鋼１０を鋼管２に溶接固定して、帯鋼付き被覆金属板３を鋼管２に巻き付けた後、被覆金属板４の鋼管２への巻き終りとなる巻終り端部４ｂを、第２の帯鋼１０に溶接固定する。または、図示は省略するが、前記巻終り端部４ｂを、第２の帯鋼１０の直近の被覆金属板４に溶接固定する。
このようにすれば、帯鋼付き被覆金属板３の管軸方向の重ね部を容易かつ確実に鋼管２に固定できる。 In addition, after the steel pipe 2 is covered with the coated metal plate 3 with the steel strip, the ends of the coated metal plate 3 with the steel strip are overlapped and fixed by welding along the axial direction of the steel pipe 2 as follows. You may do it.
That is, first, as shown in FIG. 4 (a), when the coated metal plate 3 with the strip steel is wound around the steel pipe 2, the winding start end 4 a that starts the winding of the coated metal plate 4 around the steel pipe 2 is preliminarily provided. A second steel strip 10 thicker than the coated metal plate 4 is attached.
Then, after the second steel strip 10 is welded and fixed to the steel pipe 2, and the coated metal plate 3 with the steel strip is wound around the steel pipe 2, the winding end portion 4 b that is the end of winding the coated metal plate 4 around the steel pipe 2. Is fixed to the second steel strip 10 by welding. Or although illustration is abbreviate | omitted, the said winding end part 4b is weld-fixed to the covering metal plate 4 nearest to the 2nd steel strip 10. As shown in FIG.
If it does in this way, the overlap part of the pipe axis direction of covering metal plate 3 with a steel strip can be fixed to steel pipe 2 easily and reliably.

また、図４（ｂ）に示すように、被覆金属板４の巻始め端部４ａに取り付けられた第２の帯鋼１０に加えて、被覆金属板４の巻終り端部４ｂに予め該被覆金属板４より厚い第３の帯鋼１１を取り付けておき、帯鋼付き被覆金属板３を鋼管３に巻き付けた後、第３の帯鋼１１を前記第２の帯鋼１０に重ねて溶接固定する。
このようにすれば、帯鋼付き被覆金属板３の管軸方向の重ね部をさらに容易かつ確実に鋼管に固定できる。 Further, as shown in FIG. 4B, in addition to the second steel strip 10 attached to the winding start end portion 4a of the coated metal plate 4, the winding end portion 4b of the coated metal plate 4 is previously coated with the coating. A third steel strip 11 thicker than the metal plate 4 is attached, and the coated metal plate 3 with the steel strip is wound around the steel pipe 3, and then the third steel strip 11 is overlapped on the second steel strip 10 and fixed by welding. To do.
If it does in this way, the piled-up part of the pipe axis direction of the covering metal plate 3 with a steel strip can be fixed to a steel pipe still more easily and reliably.

さらに、金属被覆鋼管1において帯鋼付き被覆金属板３の鋼管軸方向への被覆長を伸ばす場合、以下のようにして行う。
すなわち、図５（ａ）に示すように、帯鋼付き被覆金属板３を鋼管２の軸方向に複数溶接固定するに際し、鋼管２の軸方向に隣り合う被覆金属板４，４のうち、一方（図において右方）の被覆金属板４に取り付けられている第１帯鋼５を、他方（図において左方）の既に鋼管２に溶接固定されている被覆金属板４に取り付けられている第１帯鋼５に重ね合わせて溶接する。
このようにすれば、帯鋼付き被覆金属板３の鋼管軸方向への被覆長を伸ばす際に、鋼管軸方向に隣り合う、被覆金属板４，４どうしを容易かつ確実に接合できる。
また、図５（ｂ）に示すように、帯鋼付き被覆金属板３を鋼管２の軸方向に複数溶接固定するに際し、他方（図において右方）の被覆金属板４の前記第１帯鋼５が取り付けられていない端部を一方（図において左方）の被覆金属板４の端部に取り付けられている第１帯鋼５に溶接する。
このようにすれば、他方の被覆金属板４の両端部のうち一方の端部には第１帯鋼５を取り付けずにすむので、その分経済的である。
また、隣り合う被覆金属板４，４がほぼ面一に配置され、段差が生じることがないので、仕上がりが良好となる。 Furthermore, when extending the coating length in the steel pipe axial direction of the coated metal plate 3 with the strip steel in the metal-coated steel pipe 1, it is performed as follows.
That is, as shown in FIG. 5 (a), when a plurality of coated metal plates 3 with a steel strip are welded and fixed in the axial direction of the steel pipe 2, one of the coated metal plates 4 and 4 adjacent in the axial direction of the steel pipe 2. The first steel strip 5 attached to the coated metal plate 4 (on the right in the figure) is attached to the coated metal plate 4 already welded and fixed to the other steel pipe 2 (on the left in the figure). It is overlapped and welded to the steel strip 5.
If it does in this way, when extending the coating length to the steel pipe axial direction of the covering metal plate 3 with a steel strip, the covering metal plates 4 and 4 adjacent to the steel pipe axial direction can be joined easily and reliably.
Further, as shown in FIG. 5B, when a plurality of coated metal plates 3 with a steel strip are welded and fixed in the axial direction of the steel pipe 2, the first steel strip of the other coated metal plate 4 (right side in the figure). The end portion to which 5 is not attached is welded to the first steel strip 5 attached to the end portion of one of the coated metal plates 4 (left side in the figure).
In this way, it is not necessary to attach the first steel strip 5 to one end portion of both end portions of the other coated metal plate 4, which is economical.
Further, the adjacent coated metal plates 4 and 4 are arranged almost flush with each other, and no step is produced, so that the finish is good.

さらに、図５（ｃ）に示すように、帯鋼付き被覆金属板４を鋼管２の軸方向に複数溶接固定するに際し、他方（図において右方）の被覆金属板４の前記第１帯鋼５が取り付けられていない端部を一方（図において左方）の被覆金属板４の端部に溶接する。
このようにすれば、他方の被覆金属板４の両端部のうち一方の端部には第１帯鋼５を取り付けずにすむので、その分経済的である。
また、表面に帯鋼５が露出しないので、この点において仕上がりが良好なものとなる。 Further, as shown in FIG. 5 (c), when a plurality of coated metal plates 4 with steel strip are welded and fixed in the axial direction of the steel pipe 2, the first steel strip of the other coated metal plate 4 (right side in the figure). The end portion to which 5 is not attached is welded to the end portion of one of the coated metal plates 4 (left side in the figure).
In this way, it is not necessary to attach the first steel strip 5 to one end portion of both end portions of the other coated metal plate 4, which is economical.
In addition, since the steel strip 5 is not exposed on the surface, the finish is good in this respect.

また、上記図５（ｂ），（ｃ）に示すように、延長用の被覆金属板４は鋼管1に被覆される状態で鋼管２とある程度のクリアランス１２が生じるが、被覆金属板４の端部を被覆金属板４の帯鋼５または被覆金属板４へ直接溶接固定する場合でも、密着性を確保しやすくなり、被覆金属板４の一方の端部には帯鋼５を取り付けなくても溶接が容易になる。   Further, as shown in FIGS. 5 (b) and 5 (c), the extended coated metal plate 4 has a certain clearance 12 with the steel pipe 2 in a state where it is covered with the steel pipe 1. Even when the part is directly welded and fixed to the steel strip 5 of the coated metal plate 4 or the coated metal plate 4, it becomes easy to ensure adhesion, and the strip steel 5 is not attached to one end of the coated metal plate 4. Welding is easy.

本発明の実施の形態に係る金属被覆鋼管の製造方法を示すもので、被覆金属板を鋼管に巻き付けている状態を示す斜視図である。The manufacturing method of the metal-coated steel pipe which concerns on embodiment of this invention is shown, and it is a perspective view which shows the state which has wound the covering metal plate around the steel pipe. 同、図１における、金属被覆鋼管の端部を示す断面図である。It is sectional drawing which shows the edge part of the metal-coated steel pipe in FIG. 同、被覆金属板を鋼管の軸方向に溶接している状態を示すもので、（ａ）はその斜視図、（ｂ）はその断面図である。The state which welds the covering metal plate to the axial direction of a steel pipe is shown, (a) is the perspective view, (b) is the sectional drawing. 同、被覆金属板の重ね合わせ部の他の例を示す断面図である。It is sectional drawing which shows the other example of the overlapping part of a covering metal plate equally. 同、被覆金属板の鋼管軸方向への被覆長を伸ばす場合を説明する断面図である。It is sectional drawing explaining the case where the covering length to the steel pipe axial direction of a covering metal plate is extended similarly.

符号の説明Explanation of symbols

１ 金属被覆鋼管
２ 鋼管
３ 帯鋼付き被覆金属板
４ 被覆金属板
４ａ 巻始め端部
４ｂ 巻き終り端部
５ 第１の帯鋼
１０ 第２の帯鋼
１１ 第３の帯鋼 DESCRIPTION OF SYMBOLS 1 Metal-coated steel pipe 2 Steel pipe 3 Coated metal plate with strip steel 4 Coated metal plate 4a Winding end 4b End of winding 5 First strip 10 Second strip 11 Third strip

Claims (4)

薄板状の被覆金属板を鋼管に被覆して金属被覆鋼管を製造する金属被覆鋼管の製造方法において、
前記被覆金属板の少なくとも一方の端部に予め該被覆金属板より厚い第１の帯鋼を取り付けることによって帯鋼付き被覆金属板を製造しておき、
この帯鋼付き被覆金属板を、その第１の帯鋼が前記鋼管の周方向に沿うようにして、前記鋼管に巻き付けて被覆し、前記第１の帯鋼の端部を前記鋼管に溶接することを特徴とする金属被覆鋼管の製造方法。 In a method for manufacturing a metal-coated steel pipe, in which a thin-plate-like coated metal plate is coated on a steel pipe to produce a metal-coated steel pipe,
A coated metal plate with a steel strip is manufactured by attaching a first steel strip thicker than the coated metal plate in advance to at least one end of the coated metal plate,
The coated metal plate with the steel strip is wrapped around the steel pipe so that the first steel strip is along the circumferential direction of the steel pipe, and the end of the first steel strip is welded to the steel pipe. A method for producing a metal-coated steel pipe, characterized by that. 請求項１に記載の金属被覆鋼管の製造方法おいて、
前記帯鋼付き被覆金属板を前記鋼管に巻き付ける際の、前記被覆金属板の鋼管への巻き始めとなる巻始め端部に、予め前記被覆金属板より厚い第２の帯鋼を取り付けておき、
この第２の帯鋼を前記鋼管に溶接固定して前記帯鋼付き被覆金属板を前記鋼管に巻き付けた後、前記被覆金属板の鋼管への巻き終りとなる巻終り端部を、前記第２の帯鋼または前記被覆金属板に溶接固定することを特徴とする金属被覆鋼管の製造方法。 In the manufacturing method of the metal-coated steel pipe according to claim 1,
At the time of winding the coated metal plate with the steel strip around the steel pipe, a second steel strip thicker than the coated metal plate is attached in advance to the winding start end portion of the coated metal plate to be wound around the steel pipe,
After the second steel strip is welded and fixed to the steel pipe and the coated metal plate with the steel strip is wound around the steel pipe, the winding end portion that is the end of the winding of the coated metal plate around the steel pipe is defined as the second steel strip. A method for producing a metal-coated steel pipe, characterized by welding and fixing to a steel strip or the coated metal plate. 請求項２に記載の金属被覆鋼管の製造方法において、
前記被覆金属板の巻終り端部に予め該被覆金属板より厚い第３の帯鋼を取り付けておき、
前記帯鋼付き被覆金属板を前記鋼管に巻き付けた後、前記第３の帯鋼を前記第２の帯鋼に重ねて溶接固定することを特徴とする金属被覆鋼管の製造方法。 In the manufacturing method of the metal-coated steel pipe according to claim 2,
A third steel strip thicker than the coated metal plate is attached in advance to the end of winding of the coated metal plate,
A method for manufacturing a metal-coated steel pipe, comprising: winding the coated metal plate with a steel strip around the steel pipe, and then welding and fixing the third steel strip on the second steel strip. 請求項１〜請求項３のいずれかに記載の金属被覆鋼管の製造方法において、
前記帯鋼付き被覆金属板を前記鋼管の軸方向に複数溶接固定するに際し、
前記鋼管の軸方向に隣り合う被覆金属板のうち、一方の被覆金属板に取り付けられている第１帯鋼を、他方の被覆金属板に取り付けられている第１帯鋼に重ね合わせて溶接するか、または、他方の被覆金属板の前記第１帯鋼が取り付けられていない端部を前記一方の被覆金属板の端部またはこの端部に取り付けられている第１帯鋼に溶接することを特徴とする金属被覆鋼管の製造方法。 In the manufacturing method of the metal-coated steel pipe according to any one of claims 1 to 3,
When fixing a plurality of the coated metal plates with the steel strip in the axial direction of the steel pipe,
Of the coated metal plates adjacent to each other in the axial direction of the steel pipe, the first steel strip attached to one coated metal plate is overlapped and welded to the first steel strip attached to the other coated metal plate. Or welding the end of the other coated metal plate to which the first steel strip is not attached to the end of the one coated metal plate or the first steel strip attached to this end. A method for producing a metal-coated steel pipe characterized by
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016079742A (en) * 2014-10-21 2016-05-16 新日鉄住金エンジニアリング株式会社 Superstructure of piled marine structure and piled marine structure

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JPS5445668A (en) * 1977-09-20 1979-04-11 Babcock Hitachi Kk Method of producing large-diameter stainless steel pipes employing explosive weld clad steel plate
JPH07279191A (en) * 1994-04-11 1995-10-24 Nippon Steel Corp Titanium-coated anticorrosion structure
JPH09182970A (en) * 1995-12-28 1997-07-15 Nippon Steel Weld Prod & Eng Co Ltd Method and equipment for indirect resistance welding of titanium sheet
JPH1133733A (en) * 1997-07-22 1999-02-09 Nippon Steel Weld Prod & Eng Co Ltd Titanium thin plate coating method for metal base surface

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Publication number Priority date Publication date Assignee Title
JPS5445668A (en) * 1977-09-20 1979-04-11 Babcock Hitachi Kk Method of producing large-diameter stainless steel pipes employing explosive weld clad steel plate
JPH07279191A (en) * 1994-04-11 1995-10-24 Nippon Steel Corp Titanium-coated anticorrosion structure
JPH09182970A (en) * 1995-12-28 1997-07-15 Nippon Steel Weld Prod & Eng Co Ltd Method and equipment for indirect resistance welding of titanium sheet
JPH1133733A (en) * 1997-07-22 1999-02-09 Nippon Steel Weld Prod & Eng Co Ltd Titanium thin plate coating method for metal base surface

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016079742A (en) * 2014-10-21 2016-05-16 新日鉄住金エンジニアリング株式会社 Superstructure of piled marine structure and piled marine structure

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