JP5333281B2 - Method of preventing bending during expansion of UOE steel pipe - Google Patents

Method of preventing bending during expansion of UOE steel pipe Download PDF

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JP5333281B2
JP5333281B2 JP2010032686A JP2010032686A JP5333281B2 JP 5333281 B2 JP5333281 B2 JP 5333281B2 JP 2010032686 A JP2010032686 A JP 2010032686A JP 2010032686 A JP2010032686 A JP 2010032686A JP 5333281 B2 JP5333281 B2 JP 5333281B2
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steel pipe
uoe steel
peripheral surface
pipe
predetermined direction
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JP2011167710A (en
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俊博 三輪
栄治 川江
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of horizontal bend more effectively when expanding a UOE steel pipe. <P>SOLUTION: When performing the expansion of the UOE steel pipe 1 by inserting a boom 3 having an expanding head 4 at the top from one end of the UOE steel pipe 1 and making the expanding head 4 expand in the direction perpendicular to the axis, an inside block 11 for maintaining the relative distance of both sides is inserted between the inner peripheral surface 1a on the side of one end than the expanding head 4 in the UOE steel pipe 1 and on the opposite side to the predetermined direction and the outer peripheral surface 3a of a boom 3 which is opposed to this inner peripheral surface 1a, in order to prevent the axis of the UOE steel pipe 1 from bending in the predetermined direction from the expanding head 4 to the side of one end and also the outer peripheral surface 1b on the side of one end of the inside block 11 in the UOE steel pipe 1 and on the opposite side to the predetermined direction is supported with an outside roller 12. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、ＵＯＥ鋼管の拡管時湾曲防止方法に関するものである。   The present invention relates to a method for preventing bending during expansion of a UOE steel pipe.

従来、ＵＯＥ鋼管を上下左右の四方から軸直方向に拘束するロールスタンドを設け、ＵＯＥ鋼管の拡管を行うときに、ロールスタンド自体をＵＯＥ鋼管の径方向に変位させることにより、ＵＯＥ鋼管の曲がりを矯正するものがあった（特許文献１参照）。   Conventionally, a roll stand that restrains the UOE steel pipe in the direction perpendicular to the upper, lower, left, and right sides is provided, and when the UOE steel pipe is expanded, the roll stand itself is displaced in the radial direction of the UOE steel pipe, thereby bending the UOE steel pipe. There was a thing to correct (refer to patent documents 1).

特開昭６３−２５１７号公報JP-A 63-2517

ＵＯＥ鋼管を外方から押圧して矯正する場合、矯正対象の強度が低ければ、ある程度の効果があるが、高強度で厚物だと、外方からの押圧では充分な矯正効果が得られないことがあった。
本発明の課題は、高強度で厚物であっても、ＵＯＥ鋼管の拡管時に横曲がりが発生することを、より効果的に防止することである。 When straightening by pressing the UOE steel pipe from the outside, there is a certain effect if the strength of the straightening object is low, but if the strength is high and thick, pressing from the outside does not provide a sufficient straightening effect. There was a thing.
An object of the present invention is to more effectively prevent lateral bending from occurring when a UOE steel pipe is expanded even if it is a high strength and thick material.

上記の課題を解決するために、本発明に係るＵＯＥ鋼管の拡管時湾曲防止方法は、先端に拡管ヘッドを有するブームをＵＯＥ鋼管の一端から挿入し、前記拡管ヘッドを軸直方向に拡径させて前記ＵＯＥ鋼管の拡管を行う際に、前記ＵＯＥ鋼管の軸線が前記拡管ヘッドから一端側にかけて予め判明している所定方向に湾曲することを防止するために、前記ＵＯＥ鋼管における前記拡管ヘッドよりも一端側で且つ前記所定方向とは反対側の内周面と、当該内周面に対向する前記ブームの外周面との間に、双方の相対距離を維持するためのインサイド部材を介挿すると共に、前記ＵＯＥ鋼管における前記インサイド部材よりも一端側で且つ前記所定方向とは反対側の外周面を、アウトサイド部材によって支持することを特徴とする。   In order to solve the above-described problems, a method of preventing bending during expansion of a UOE steel pipe according to the present invention includes inserting a boom having a pipe expansion head at the tip from one end of the UOE steel pipe, and expanding the diameter of the pipe expansion head in the axial direction. When the UOE steel pipe is expanded, the axis of the UOE steel pipe is prevented from being bent in a predetermined direction that is known in advance from the pipe expansion head to one end side, than the pipe expansion head in the UOE steel pipe. While inserting an inside member for maintaining the relative distance between the inner peripheral surface on one end side and opposite to the predetermined direction, and the outer peripheral surface of the boom facing the inner peripheral surface The outer surface of the UOE steel pipe on one end side than the inside member and opposite to the predetermined direction is supported by an outside member.

本発明に係るＵＯＥ鋼管の拡管時湾曲防止方法によれば、拡管時に、ＵＯＥ鋼管の内周面がブームの外周面に接近することをインサイド部材が防ぎ、このときＵＯＥ鋼管がインサイド部材から受ける反力をアウトサイド部材で支持することができるので、高強度で厚物であっても、ＵＯＥ鋼管が所定方向に湾曲しようとすることを、より効果的に防止することができる。   According to the UOE steel pipe bending prevention method according to the present invention, at the time of pipe expansion, the inside member prevents the inner circumferential surface of the UOE steel pipe from approaching the outer circumferential surface of the boom. At this time, the UOE steel pipe receives the reaction from the inside member. Since the force can be supported by the outside member, it is possible to more effectively prevent the UOE steel pipe from bending in a predetermined direction even if it is a high strength and thick material.

本発明の概略構成図である。It is a schematic block diagram of this invention. ＵＯＥ鋼管の断面図である。It is sectional drawing of a UOE steel pipe. 拡管時にＵＯＥ鋼管１が湾曲した状態を示す図である。It is a figure which shows the state which the UOE steel pipe 1 curved at the time of pipe expansion. 実施例の効果を示す図である。It is a figure which shows the effect of an Example.

以下、本発明の実施形態を図面に基づいて説明する。
《一実施形態》
《構成》
図１は、本発明の概略構成図である。
図２は、ＵＯＥ鋼管の断面図である。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<< One Embodiment >>
"Constitution"
FIG. 1 is a schematic configuration diagram of the present invention.
FIG. 2 is a cross-sectional view of a UOE steel pipe.

ＵＯＥ鋼管１は、ＵＯＥ方式によって製造する大径溶接鋼管である。先ず、厚板の端面に開先加工を施してから、プレス加工にてＵ形、Ｏ形の順に2段成形し、突き合わせた端面を仮付けしてから、内外面をサブマージアーク溶接法によりシーム溶接する。その後、拡管機２で所定の外径に仕上げる。
拡管機２は、先端がＵＯＥ鋼管１の一端から挿入される軸状のブーム３と、このブーム３の先端に設けられ軸直方向に拡径するときにＵＯＥ鋼管１を拡管する拡管ヘッド４と、を備える。 The UOE steel pipe 1 is a large diameter welded steel pipe manufactured by the UOE method. First, groove processing is applied to the end face of the thick plate, then two steps are formed in the order of U-shaped and O-shaped by press working, the butted end faces are temporarily attached, and the inner and outer surfaces are then seamed by submerged arc welding. Weld. Thereafter, the tube expander 2 finishes the tube with a predetermined outer diameter.
The pipe expander 2 includes a shaft-like boom 3 whose tip is inserted from one end of the UOE steel pipe 1, and a pipe expanding head 4 that is provided at the tip of the boom 3 and expands the UOE steel pipe 1 when expanding in the direction perpendicular to the axis. .

拡管ヘッド４は、テーパ外周面５と、拡管ダイス８と、を備える。
テーパ外周面５は、ブーム３の先端側に形成され、先端側から基端側に向けて縮径している。拡管ダイス８は、テーパ外周面５に摺接し、先端側から基端側に向けて拡径したテーパ内周面６と、ＵＯＥ鋼管１の内周面に対向するダイス外周面７とを備え、テーパ外周面５の周方向に沿って複数配設されている。 The tube expansion head 4 includes a tapered outer peripheral surface 5 and a tube expansion die 8.
The taper outer peripheral surface 5 is formed on the distal end side of the boom 3 and is reduced in diameter from the distal end side toward the proximal end side. The pipe expansion die 8 includes a taper inner peripheral surface 6 that is in sliding contact with the taper outer peripheral surface 5 and is expanded from the distal end side toward the base end side, and a die outer peripheral surface 7 that faces the inner peripheral surface of the UOE steel pipe 1. A plurality of taper outer peripheral surfaces 5 are arranged along the circumferential direction.

この構成により、拡管ダイス８を拡管位置に合わせた状態で、ブーム３を拡管開始位置から後退させると、楔作用によってテーパ外周面５に摺接した拡管ダイス８の夫々が軸直方向の外側に（放射方向に）に変位するので、ＵＯＥ鋼管１が拡管する。そして、ブーム３を拡管開始位置まで前進させ、図示しないリリース機構によって拡管ダイス８を軸直方向の内側に復帰させてから、拡管ダイス８のピッチ（軸方向の長さ）に応じた量だけブーム３を更に前進させる。そして、拡管ダイス８を新たな拡管位置に合わせてから、上記の動作を繰り返し行う。こうして、拡管ダイス８のピッチ分ずつＵＯＥ鋼管１の拡管を、その全長に渡って行う。   With this configuration, when the boom 3 is retracted from the tube expansion start position with the tube expansion die 8 set to the tube expansion position, each of the tube expansion dies 8 slidably contacting the taper outer peripheral surface 5 by the wedge action is placed outward in the axial direction. Since it is displaced (in the radial direction), the UOE steel pipe 1 is expanded. Then, the boom 3 is advanced to the tube expansion start position, the tube expansion die 8 is returned to the inner side in the axial direction by a release mechanism (not shown), and then the boom is increased by an amount corresponding to the pitch (length in the axial direction) of the tube expansion die 8. Advance 3 further. Then, after the tube expansion die 8 is set to a new tube expansion position, the above operation is repeated. In this way, the UOE steel pipe 1 is expanded over the entire length by the pitch of the pipe expansion die 8.

上記の拡管工程を行う際には、ＵＯＥ鋼管１における拡管ヘッド４よりも一端側で且つ所定方向とは反対側の内周面１ａと、この内周面１ａに対向するブーム３の外周面３ａとの間に、双方の相対距離を維持するためのインサイドブロック１１を介挿する。このインサイドブロック１１は、例えばブーム３に固定しておく。なお、拡管前の初期設定の状態では、ＵＯＥ鋼管１とブーム３とを同心円上に配置したときに、インサイドブロック１１とＵＯＥ鋼管１との間には、数ｍｍ程度の隙間があるようにする。鋼管を装入し易くするためである。   When performing the pipe expanding step, the inner peripheral surface 1a on one end side of the UOE steel pipe 1 with respect to the pipe expanding head 4 and opposite to the predetermined direction, and the outer peripheral surface 3a of the boom 3 facing the inner peripheral surface 1a. The inside block 11 for maintaining the relative distance between the two is inserted between the two. For example, the inside block 11 is fixed to the boom 3. In the initial setting state before pipe expansion, when the UOE steel pipe 1 and the boom 3 are arranged concentrically, a gap of about several millimeters is provided between the inside block 11 and the UOE steel pipe 1. . This is to make it easier to insert the steel pipe.

また、ＵＯＥ鋼管１におけるインサイドブロック１１よりも一端側で且つ所定方向とは反対側の外周面１ｂを、アウトサイドローラ１２によって支持する。このアウトサイドローラ１２は、図示しないローラフレームによって支持される。なお、ローラフレームは、ＵＯＥ鋼管１を左右の二方向から拘束する二つのアウトサイドローラを備えるものとする。後述するが、拡管時にＵＯＥ鋼管１が湾曲する方向は予め把握することができ、ほぼ左右のどちらかに決まっているため、左右の二方向から拘束すれば十分であるが、これに限定されるものではない。   In addition, the outer roller 1 is supported by the outside roller 12 on the outer peripheral surface 1 b on the one end side of the UOE steel pipe 1 and on the side opposite to the predetermined direction. The outside roller 12 is supported by a roller frame (not shown). In addition, a roller frame shall be equipped with two outside rollers which restrain UOE steel pipe 1 from two directions on either side. As will be described later, the direction in which the UOE steel pipe 1 bends at the time of pipe expansion can be grasped in advance, and since it is determined to be either left or right, it is sufficient to constrain from the left and right directions, but it is limited to this. It is not a thing.

《作用》
図３は、拡管時にＵＯＥ鋼管１が湾曲した状態を示す図である。
拡管を行うと、図３に示すように、ＵＯＥ鋼管１の軸線が、拡管ヘッド４から一端側にかけて所定方向に湾曲する傾向がある。一般に、ＵＯＥ鋼管１を製造するための厚板は、幅広の厚板を幅方向に二つに切断したものであるため、その幅方向に強度差がある。すなわち、ＵＯＥ鋼管１は、溶接点Ｗを境にして周方向に強度差がある。これが拡管時にＵＯＥ鋼管１が所定方向へ湾曲する一因であるため、拡管時にＵＯＥ鋼管１が湾曲する方向は予め把握することができる。したがって、ここで「所定方向」とは、拡管時の湾曲予定方向を指す。 <Action>
FIG. 3 is a diagram showing a state in which the UOE steel pipe 1 is bent during pipe expansion.
When the pipe expansion is performed, the axis of the UOE steel pipe 1 tends to bend in a predetermined direction from the pipe expansion head 4 to one end side, as shown in FIG. Generally, a thick plate for manufacturing the UOE steel pipe 1 is obtained by cutting a wide thick plate into two in the width direction, and therefore there is a difference in strength in the width direction. That is, the UOE steel pipe 1 has a strength difference in the circumferential direction with the welding point W as a boundary. Since this is one factor that causes the UOE steel pipe 1 to bend in a predetermined direction when the pipe is expanded, the direction in which the UOE steel pipe 1 is bent when the pipe is expanded can be grasped in advance. Therefore, here, the “predetermined direction” refers to a planned bending direction during tube expansion.

本実施形態では、ＵＯＥ鋼管１における所定方向とは反対側の内周面１ａとブーム３の外周面３ａとの間にインサイドブロック１１を介挿すると共に、ＵＯＥ鋼管１における所定方向とは反対側の外周面１ｂをアウトサイドローラ１２によって支持する。
これによれば、拡管時に、ＵＯＥ鋼管１の内周面１ａがブーム３の外周面３ａに接近することをインサイドブロック１１が防ぎ、このときＵＯＥ鋼管１がインサイドブロック１１から受ける反力をアウトサイドローラ１２で支持する（押さえつける）ことができるので、高強度で厚物であっても、ＵＯＥ鋼管１が所定方向に湾曲しようとすることを、より効果的に防止することができる。
以上より、インサイドブロック１１が「インサイド部材」に対応し、アウトサイドローラ１２が「アウトサイド部材」に対応する。 In the present embodiment, the inside block 11 is interposed between the inner peripheral surface 1a opposite to the predetermined direction in the UOE steel pipe 1 and the outer peripheral surface 3a of the boom 3, and the opposite side to the predetermined direction in the UOE steel pipe 1 The outer peripheral surface 1 b is supported by the outside roller 12.
According to this, the inside block 11 prevents that the inner peripheral surface 1a of the UOE steel pipe 1 approaches the outer peripheral surface 3a of the boom 3 at the time of pipe expansion, and the reaction force that the UOE steel pipe 1 receives from the inside block 11 at this time is outside. Since it can be supported (pressed) by the roller 12, it is possible to more effectively prevent the UOE steel pipe 1 from bending in a predetermined direction even if it is a high strength and thick material.
From the above, the inside block 11 corresponds to the “inside member”, and the outside roller 12 corresponds to the “outside member”.

《実施例》
下記の条件で実施をした。
サイズ：外径５５８.８ｍｍ、厚さ２０.０ｍｍ、長さ１２０００ｍｍ
規 格：Ｘ６５グレード（ＹＳ：４５０ＭＰａ相当）
仕 様：湾曲量管理値 １.５ｍｍ／１０００ｍｍ（長さ１０００ｍｍ当りの湾曲量）
図４は、実施例の効果を示す図である。ここで、横曲がり発生率とは、前記湾曲量管理値を超える横曲がりが発生した率（％）である。 "Example"
It implemented on condition of the following.
Size: Outer diameter 558.8mm, thickness 20.0mm, length 12000mm
Standard: X65 grade (YS: 450MPa equivalent)
Specification: Curvature amount control value 1.5mm / 1000mm (bend amount per 1000mm length)
FIG. 4 is a diagram illustrating the effect of the embodiment. Here, the horizontal bending occurrence rate is a rate (%) at which a horizontal bending exceeding the bending amount management value occurs.

ここで、従来例とは、ＵＯＥ鋼管１における所定方向と同一側の外周面をアウトサイドローラ１２によって支持した場合である。この従来技術と比べて、本発明を適用した実施例では、横曲がりを６％から１％まで軽減することができた。
なお、ＵＯＥ鋼管１における所定方向と反対側の内周面１ａにインサイドブロック１１を挿入するだけでは、上記ほどの効果は得られなかった。さらに、ＵＯＥ鋼管１における所定方向とは反対側の内周面１ａにインサイドブロック１１を挿入すると共に、ＵＯＥ鋼管１における所定方向と同一側の外周面をアウトサイドローラ１２によって支持した場合も、上記ほどの効果は得られなかった。 Here, the conventional example is a case where the outer peripheral surface of the UOE steel pipe 1 on the same side as the predetermined direction is supported by the outside roller 12. Compared with this prior art, in the embodiment to which the present invention was applied, the lateral bending could be reduced from 6% to 1%.
In addition, the effect as above was not acquired only by inserting the inside block 11 in the internal peripheral surface 1a on the opposite side to the predetermined direction in the UOE steel pipe 1. FIG. Further, when the inside block 11 is inserted into the inner peripheral surface 1a opposite to the predetermined direction in the UOE steel pipe 1 and the outer peripheral surface on the same side as the predetermined direction in the UOE steel pipe 1 is supported by the outside roller 12, The effect was not obtained.

《応用例》
なお、本実施形態では、ブーム３を後退させることで、ＵＯＥ鋼管１の拡管を行う拡管機２について説明したが、これに限定されるものではなく、油圧機構などによって拡管ダイス８を軸直方向の外側に変位させる構造であってもよい。
また、本実施形態では、インサイドブロック１１やアウトサイドローラ１２の一例を示したに過ぎず、夫々の形状や数量や位置については、本発明の主旨を逸脱しない範囲で、適宜、変更してもよい。 《Application example》
In the present embodiment, the pipe expander 2 that expands the UOE steel pipe 1 by retracting the boom 3 has been described. However, the present invention is not limited to this, and the pipe expansion die 8 is moved in the axial direction by a hydraulic mechanism or the like. It may be a structure that is displaced to the outside.
In the present embodiment, only an example of the inside block 11 and the outside roller 12 is shown, and the shape, quantity, and position of each may be changed as appropriate without departing from the gist of the present invention. Good.

１ ＵＯＥ鋼管
２ 拡管機
３ ブーム
４ 拡管ヘッド
５ テーパ外周面
６ テーパ内周面
７ ダイス外周面
８ 拡管ダイス
１１ インサイドブロック
１２ アウトサイドローラ DESCRIPTION OF SYMBOLS 1 UOE steel pipe 2 Tube expander 3 Boom 4 Tube expansion head 5 Tapered outer peripheral surface 6 Tapered inner peripheral surface 7 Dies outer peripheral surface 8 Tube expanding die 11 Inside block 12 Outside roller

Claims (1)

先端に拡管ヘッドを有するブームをＵＯＥ鋼管の一端から挿入し、前記拡管ヘッドを軸直方向に拡径させて前記ＵＯＥ鋼管の拡管を行う際に、前記ＵＯＥ鋼管の軸線が前記拡管ヘッドから一端側にかけて予め判明している所定方向に湾曲することを防止するために、
前記ＵＯＥ鋼管における前記拡管ヘッドよりも一端側で且つ前記所定方向とは反対側の内周面と、当該内周面に対向する前記ブームの外周面との間に、双方の相対距離を維持するためのインサイド部材を介挿すると共に、
前記ＵＯＥ鋼管における前記インサイド部材よりも一端側で且つ前記所定方向とは反対側の外周面を、アウトサイド部材によって支持することを特徴とするＵＯＥ鋼管の拡管時湾曲防止方法。 When a boom having a pipe expansion head at the tip is inserted from one end of the UOE steel pipe and the pipe expansion head is expanded in the direction perpendicular to the axis to expand the UOE steel pipe, the axis of the UOE steel pipe is at one end side from the pipe expansion head. In order to prevent bending in a predetermined direction,
A relative distance between the inner peripheral surface of the UOE steel pipe that is one end side of the tube expansion head and opposite to the predetermined direction and the outer peripheral surface of the boom facing the inner peripheral surface is maintained. While inserting an inside member for
A method of preventing a UOE steel pipe from being bent during expansion of the UOE steel pipe, comprising supporting an outer peripheral surface of the UOE steel pipe at one end side of the UOE steel pipe and opposite to the predetermined direction by an outside member.
JP2010032686A 2010-02-17 2010-02-17 Method of preventing bending during expansion of UOE steel pipe Expired - Fee Related JP5333281B2 (en)

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