JPH05131277A - Tube joining method and tube clamp device - Google Patents

Tube joining method and tube clamp device

Info

Publication number
JPH05131277A
JPH05131277A JP3047596A JP4759691A JPH05131277A JP H05131277 A JPH05131277 A JP H05131277A JP 3047596 A JP3047596 A JP 3047596A JP 4759691 A JP4759691 A JP 4759691A JP H05131277 A JPH05131277 A JP H05131277A
Authority
JP
Japan
Prior art keywords
pipe
clamp
heating coil
medium diameter
peripheral surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP3047596A
Other languages
Japanese (ja)
Other versions
JP2906700B2 (en
Inventor
Fumio Kashimoto
文雄 樫本
Yuichi Komizo
裕一 小溝
Hisao Iida
久雄 飯田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Sumitomo Metal Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sumitomo Metal Industries Ltd filed Critical Sumitomo Metal Industries Ltd
Priority to JP3047596A priority Critical patent/JP2906700B2/en
Publication of JPH05131277A publication Critical patent/JPH05131277A/en
Application granted granted Critical
Publication of JP2906700B2 publication Critical patent/JP2906700B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To effectively join the tube of large or middle-sized diameter such as steel pipe for piling with high strength at the site. CONSTITUTION:The 1st clamp 40 is attached on the outer circumferential surface of the upper end part of a lower pipe 10 on one hand, and the 2nd clamp 50 is attached on the outer circumferential surface of the lower end part of an upper pipe 20. In the state for drawing the 1st clamp 40 and the 2nd clamp 50 near mutually with plural connecting and tightening bolts 60 by inserting an insert material between the lower pipe 40 and the upper pipe 20, the butt part is heated with high frequency over than the melting point of insert material with a heating coil 80. Therefore, the lower pipe 10 and the upper pipe 20 are joined in a short time with diffusion joining. For improving the workability during tube clamping, the 1st clamp 40 and the 2nd clamp 50 are mutually independent, and independent from the heating coil 80.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、鋼管杭、ガス管等の大
中径管を施工現場で相互接続するのに適した管接合方
法、およびこれに使用する管クランプ装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe joining method suitable for interconnecting large and medium diameter pipes such as steel pipe piles and gas pipes at a construction site, and a pipe clamp device used therefor.

【0002】[0002]

【従来の技術】鋼管杭は、周知のように、外径が400
以上の大中径管からなり、施工現場で順に接続されなが
ら埋設施工される。これにおける鋼管杭の相互接続に
は、MAGによる多層盛溶接が用いられている。これを
図5に示す。MAGによる多層盛溶接を用いた鋼管杭の
相互接続では、所定の深さまで下管10が埋め込まれた
時点で、その上端部内周面に円筒状のガイド91が溶接
される。ガイド91が溶接されると、上管20をクレー
ンで吊り上げて下管10の上に同心状にセットする。上
管20の下端面には予め開先が施されている。そして、
上管20のセット後に、多層盛溶接にて下管10に上管
20が接合される。
As is well known, steel pipe piles have an outer diameter of 400
It consists of the above large and medium diameter pipes and is buried at the construction site while being connected in sequence. Multi-layer welding by MAG is used for interconnecting the steel pipe piles in this case. This is shown in FIG. In the interconnection of steel pipe piles using multi-layer welding by MAG, a cylindrical guide 91 is welded to the inner peripheral surface of the upper end of the lower pipe 10 when the lower pipe 10 is embedded to a predetermined depth. When the guide 91 is welded, the upper pipe 20 is lifted by a crane and set concentrically on the lower pipe 10. A groove is formed in advance on the lower end surface of the upper pipe 20. And
After setting the upper pipe 20, the upper pipe 20 is joined to the lower pipe 10 by multilayer welding.

【0003】鋼管杭以外では、大中径管を用いたガス管
も、MAGによる多層盛溶接で相互接続される。ここで
は、図6に示すように、溶接に先だち、円筒状のガイド
92が100本位のボルト93によりガス管14の内面
側に固定されて、ガス管94が面合わせされる。外径が
200Aを超えるような大径のガス管に対しては、面合
わせに油圧クランプが用いられることもある。
Other than steel pipe piles, gas pipes using large and medium diameter pipes are also interconnected by multi-pass welding by MAG. Here, as shown in FIG. 6, prior to welding, the cylindrical guide 92 is fixed to the inner surface side of the gas pipe 14 by 100 bolts 93, and the gas pipe 94 is face-aligned. For a large-diameter gas pipe whose outer diameter exceeds 200 A, a hydraulic clamp may be used for face-to-face matching.

【0004】[0004]

【発明が解決しようとする課題】このようなMAGによ
る多層盛溶接を用いた従来の大中径管接合方法は、溶接
施工に著しく時間がかかり、例えば、鋼管杭の相互接続
では、アークタイムだけでも4〜5時間を要し、段取作
業を含むと1本/日程度でしか接合を行うことができな
い。その上、鋼管杭の場合は、土木作業と溶接作業が異
なる業者で行われるので、溶接作業中に土木作業者が手
持ちとなる事態も多く発生し、このことが施工性を一層
低下させていた。
In the conventional large-medium diameter pipe joining method using such multi-layer welding by MAG, it takes a considerably long time for welding work. For example, in the interconnection of steel pipe piles, only arc time is required. However, it takes 4 to 5 hours, and when the setup work is included, the joining can be performed only at about 1 wire / day. In addition, in the case of steel pipe piles, civil engineering work and welding work are performed by different contractors, so there are many cases where civil engineering workers have handheld during welding work, which further deteriorates workability. ..

【0005】また、ボルト固定式のガイドを用いたガス
管の相互接続では、溶接に時間がかかることに加え、面
合わせ作業も複雑となり、その際に目違いも生じやす
い。管突き合わせ部の特に内面に大きい目違いが生じた
場合には、管外側からの片面溶接では裏波溶接ができな
くなるので、管内から油圧ジャッキを用いて拡管させる
作業も必要になり、作業能率が一層低下する。更に、面
合わせを油圧クランプで行う場合には、クランプ装置が
大掛かりとなる上、油圧ホース等の取扱いも面倒にな
り、現場での施工性が著しく悪化する。
Further, in the case of interconnecting gas pipes using bolt-fixing type guides, it takes time for welding, and the face-to-face work becomes complicated, and in that case, misalignment is likely to occur. When there is a large misalignment on the inner surface of the pipe butts, backside welding cannot be performed by single-sided welding from the outside of the pipe, so work to expand the pipe using a hydraulic jack is also required from inside the pipe, which improves work efficiency. It will be even lower. Further, when the face-to-face alignment is performed by a hydraulic clamp, the size of the clamp device becomes large, and the handling of the hydraulic hose and the like becomes troublesome, which significantly deteriorates the workability on site.

【0006】本発明の目的は、鋼管杭やボルト固定式ガ
イドを必要とするガス管の如き大中径管を能率よく簡単
に相互接続できる管接合方法およびこれに使用する小形
で取扱いの容易な管クランプ装置を提供することにあ
る。
An object of the present invention is to provide a pipe joining method capable of efficiently and easily interconnecting large-medium diameter pipes such as steel pipe piles and gas pipes requiring bolt-fixing guides, and a small-sized and easy-to-handle pipe joint used therefor. It is to provide a pipe clamp device.

【0007】[0007]

【課題を解決するための手段】本発明の管接合方法は、
一方の大中径管の一端面から僅かに離れた管外周面に環
状のクランプを装着する一方、該大中径管に接合される
他方の大中径管の一端面から僅かに離れた管外周面に前
記クランプとは別体の環状のクランプを装着し、両方の
大中径管の端面間にインサート材を挟んでその大中径管
を突き合わせた状態で、両方のクランプを相互に引き寄
せて大中径管の突き合わせ部を、前記クランプとは別体
の加熱コイルによりインサート材の融点以上に高周波加
熱することを特徴としてなる。
The pipe joining method of the present invention comprises:
An annular clamp is attached to the outer peripheral surface of the pipe slightly separated from one end face of the one large-medium diameter pipe, and a pipe slightly separated from one end face of the other large-medium diameter pipe joined to the large-medium diameter pipe. An annular clamp, which is separate from the above clamp, is attached to the outer peripheral surface, and both clamps are pulled toward each other with the insert material sandwiched between the end surfaces of both large and medium diameter pipes It is characterized in that the abutting portion of the large-medium diameter pipe is heated at a high frequency above the melting point of the insert material by a heating coil separate from the clamp.

【0008】本発明の管クランプ装置は、請求項1の管
接合方法に使用する管クランプ装置であって、加熱コイ
ルおよびそのトランスに対して別体とされ、一方の大中
径管の一端部外周面に締着される環状の第1クランプ
と、該第1クランプ、加熱コイルおよびそのトランスに
対して別体とされ、前記一方の大中径管に突き合わされ
る他方の大径管の一端部外周面に締着される環状の第2
クランプと、第1クランプおよび第2クランプを同心状
に連結して相互に引き寄せる複数本の連結締付ボルト
と、該連結締付ボルトに装着され、大中径管の突き合わ
せ部を加熱コイルで包囲するべく該加熱コイルを支持す
るコイル支持部材とを具備している。
The pipe clamp device of the present invention is the pipe clamp device used in the pipe joining method according to claim 1, wherein the pipe clamp device is separate from the heating coil and its transformer, and one end portion of one large-medium diameter pipe is provided. An annular first clamp that is fastened to the outer peripheral surface and one end of the other large-diameter pipe that is separate from the first clamp, the heating coil, and the transformer thereof, and is abutted against the one large-medium-diameter pipe An annular second part that is fastened to the outer peripheral surface of the part
A clamp, a plurality of connecting tightening bolts that connect the first clamp and the second clamp in a concentric manner and draw each other, and are attached to the connecting tightening bolts, and enclose a butt portion of a large-medium diameter pipe with a heating coil. In order to do so, a coil supporting member for supporting the heating coil is provided.

【0009】[0009]

【作用】本発明の管接合方法では、接合すべき大中径管
を突き合わせ、その各管端部外周面に装着したクランプ
を相互に引き寄せることにより、合わせ面間に初期圧が
付加される。この状態で、大中径管の突き合わせ部を加
熱コイルによりインサート材の融点以上に高周波加熱す
ることにより、大中径管が拡散接合される。拡散接合に
よれば、接合時間が高々数分と極く短く、しかも内面に
若干の目違いがあっても良好な接合が行われるので、ク
ランプ装置が簡素となる。更に、そのクランプ装置は、
各クランプが独立し、且つ加熱コイルから分離されてい
るので、大中径管に対する着脱が容易であり、クランプ
時間の短縮にも寄与する。
According to the pipe joining method of the present invention, the large and medium diameter pipes to be joined are butted against each other, and the clamps attached to the outer peripheral surfaces of the respective pipe ends are pulled together to apply an initial pressure between the joining faces. In this state, the large-medium-diameter pipe is diffusion-bonded by heating the abutting portion of the large-medium-diameter pipe with a heating coil at a high frequency higher than the melting point of the insert material. According to the diffusion bonding, the bonding time is extremely short, at most several minutes, and good bonding can be performed even if there is some misalignment on the inner surface, so that the clamp device becomes simple. Furthermore, the clamping device
Since each clamp is independent and separated from the heating coil, it is easy to attach / detach to / from the large-medium diameter pipe, which also contributes to shortening the clamping time.

【0010】本発明の管クランプ装置では、まず、接合
すべき大中径管の一方の管端部外周面に第1クランプを
装着し、他方の管端部外周面に第2クランプを装着す
る。次いで、両方の大中径管を突き合わせ、且つ、その
合わせ面間にインサート材を挟んだ状態で、両方のクラ
ンプを複数本の連続締着ボルトにより相互に引き寄せ
る。そして、各ボルトに支持部材を装着し、その支持部
材で加熱コイルを支持して、該加熱コイルにより大中径
管の突き合わせ部を外面からインサート材の融点以上に
高周波加熱する。これにより、突き合わされた大中径管
が拡散接合される。この管クランプ装置は、各クランプ
および加熱コイルがそれぞれ別体とされているので、大
中径管へのこれらの着脱が容易であり、しかも、別体で
ありながら、各クランプは複数本の連続締結ボルトによ
り高精度により組合される。更に、加熱コイルについて
も、ボルトに装着される支持部材により、突き合わせ部
に対して高精度に位置合わされる。また、複数本のボル
トの締付け力が独立に調節されるので、合わせ面が管軸
に対して傾斜している場合にも、合わせ面間のギャップ
を全周にわたってなくすることができる。
In the pipe clamp device of the present invention, first, the first clamp is attached to the outer peripheral surface of one of the large and medium diameter pipes to be joined, and the second clamp is attached to the outer peripheral surface of the other pipe end. .. Next, both large and medium diameter pipes are butted, and both clamps are drawn together by a plurality of continuous fastening bolts with the insert material sandwiched between the mating surfaces. Then, a supporting member is attached to each bolt, the heating coil is supported by the supporting member, and the abutting portion of the large-medium diameter pipe is high-frequency heated from the outer surface to the melting point of the insert material or higher by the heating coil. As a result, the large and medium diameter pipes that are abutted are diffusion bonded. In this pipe clamp device, since each clamp and heating coil are separate bodies, they can be easily attached to and detached from a large-medium diameter pipe, and even though they are separate bodies, each clamp is composed of multiple continuous pipes. It is assembled with high precision by fastening bolts. Further, the heating coil is also accurately aligned with the abutting portion by the support member attached to the bolt. Further, since the tightening forces of the plurality of bolts are independently adjusted, the gap between the mating surfaces can be eliminated over the entire circumference even when the mating surfaces are inclined with respect to the pipe axis.

【0011】[0011]

【実施例】以下に本発明の実施例を図面に基づいて詳し
く説明する。図1は本発明の管接合方法の一実施態様を
示す側面図、図2は図1のA−A線矢視図、図3は図1
のB−B線矢視図、図4は図3のC−C線矢視図であ
る。
Embodiments of the present invention will be described in detail below with reference to the drawings. 1 is a side view showing an embodiment of the pipe joining method of the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. 3 is FIG.
4 is a view taken along the line BB of FIG. 4, and FIG. 4 is a view taken along the line C-C of FIG.

【0012】ここに示された管接合方法は、鋼管杭の施
工において下管10に上管20を接合するために使用さ
れ、その接合に際してストッパ30、第1クランプ4
0、第2クランプ50、連結締付ボルト60、支持部材
70および加熱コイル80等を用いる。
The pipe joining method shown here is used for joining the upper pipe 20 to the lower pipe 10 in the construction of a steel pipe pile, and at the time of joining, the stopper 30 and the first clamp 4 are used.
0, the second clamp 50, the connecting tightening bolt 60, the support member 70, the heating coil 80, and the like are used.

【0013】まず、下管10が上端部を残して地面に打
ち込まれると、その上端部外周面にストッパ30が装着
される。ストッパ30は、複数本のボルトにより締結さ
れる半割の環状部材であり、第1クランプ40の位置決
めのために下管10の上端面から若干下った管外周面に
上下動のないように装着される。ストッパ30が装着さ
れると、クレーン吊りによりストッパ30の上に第1ク
ランプ40が装着される。
First, when the lower pipe 10 is driven into the ground leaving the upper end portion thereof, the stopper 30 is attached to the outer peripheral surface of the upper end portion. The stopper 30 is a half ring-shaped member that is fastened by a plurality of bolts, and is attached to the outer peripheral surface of the lower pipe 10 slightly lower than the upper end face thereof for positioning the first clamp 40 so as not to move vertically. To be done. When the stopper 30 is mounted, the first clamp 40 is mounted on the stopper 30 by hanging the crane.

【0014】第1クランプ40は、フック45の向きが
逆であることを除けば、第2クランプ50の上下を反転
させた構造と同一であり、その詳しい構造および装着法
は、第2クランプ50の説明のところで明らにする。な
お、第1クランプ40の装着位置は、下管10と上管2
0との突き合わせ部に加熱コイル80が外嵌されるスペ
ースを確保するために、下管10の上端面から僅かに下
がった位置とされる。
The first clamp 40 has the same structure as that of the second clamp 50 except that the hook 45 is oriented in the opposite direction. The detailed structure and mounting method of the first clamp 40 are the same as the second clamp 50. Make it clear in the explanation of. The mounting position of the first clamp 40 is the lower pipe 10 and the upper pipe 2.
In order to secure a space in which the heating coil 80 is externally fitted to the abutting portion with 0, the position is slightly lowered from the upper end surface of the lower pipe 10.

【0015】第1クランプ40が装着されると、下管1
0に接合される上管20の下端部となる端部外周面に、
第2クランプ50が第1クランプ40と同様に装着され
る。第2クランプ50は、その内周面が下管20の外周
面にほぼ全周にわたって接触する半割式の環状部材であ
り、その一対の割型51,51は、軸心に平行なピン5
2にて片開き式に組合され、その開放側の端部に設けた
傾動式のボルト53により、上管20を挟んで締付けら
れる。各割型51には、連結締付ボルト60が挿通され
る2つのボルト孔が、軸心に平行して設けられており、
その近くには、第2クランプ50をクレーンで吊り上げ
るためのフック55が設けられている。第1クランプ5
0を上管20に装着するには、まず、割型51,51を
やや開いた状態で上管20の下端部外面側に嵌め込み、
次いで、ボルト53により割型51,51を締め付け
る。その締付は、突き合せ部が加熱コイル80で高周波
加熱された際の突き合わせ部の軸方向伸びに伴う反力に
よっても、位置ずれをおこさないように強い力で行う。
When the first clamp 40 is attached, the lower pipe 1
On the outer peripheral surface of the end portion, which is the lower end portion of the upper pipe 20 joined to 0,
The second clamp 50 is mounted in the same manner as the first clamp 40. The second clamp 50 is a half-divided annular member whose inner peripheral surface is in contact with the outer peripheral surface of the lower pipe 20 over substantially the entire circumference. The pair of split dies 51, 51 has a pin 5 parallel to the axial center.
2, the upper pipe 20 is clamped by a tilting bolt 53 provided at the open end of the upper pipe 20. Each split mold 51 is provided with two bolt holes through which the connecting tightening bolts 60 are inserted, parallel to the axis.
A hook 55 for lifting the second clamp 50 with a crane is provided in the vicinity thereof. First clamp 5
In order to attach 0 to the upper pipe 20, first, the split molds 51, 51 are fitted to the outer surface side of the lower end portion of the upper pipe 20 with the split dies 51, 51 being slightly open,
Next, the split dies 51, 51 are tightened with the bolt 53. The tightening is performed with a strong force so as not to cause positional displacement even by a reaction force caused by the axial extension of the abutting portion when the abutting portion is heated by the heating coil 80 at high frequency.

【0016】上管20に第2クランプ50が装着される
と、その装着端部を下にして下管10に上管20を載
せ、下管10と上管20を突き合わせる。このとき合わ
せ面間には、Ni系アルモファス等のインサート材を介
在させる。また、第1クランプ40のボルト孔の直上に
第2クランプ50のボルト孔が位置するように、上管2
0の周方向位置を決める。そして、両ボルト孔に連結締
付ボルト60を差し通し、4本の連結締付ボルト60の
全てにナット61をねじ込む。連結締付ボルト60は、
第1クランプ40および第2クランプ50を同心状態に
連結し、ナット61のねじ込みに伴ってこれらを相互に
引き寄せる。これにより、上管10と下管20との合わ
せ面に所定の初期荷重が付加される。合わせ面間に隙間
のある場合は、ナット61の締付け力を4本の連続締付
ボルト60の間で調節して、合わせ面に全周にわたって
均一な初期荷重を付加する。
When the second clamp 50 is mounted on the upper pipe 20, the upper pipe 20 is placed on the lower pipe 10 with its mounting end portion facing down, and the lower pipe 10 and the upper pipe 20 are butted against each other. At this time, an insert material such as Ni-based alumofus is interposed between the mating surfaces. In addition, the upper pipe 2 is arranged so that the bolt hole of the second clamp 50 is located immediately above the bolt hole of the first clamp 40.
Determine the circumferential position of 0. Then, the connecting tightening bolts 60 are inserted into both bolt holes, and the nuts 61 are screwed into all of the four connecting tightening bolts 60. The connecting tightening bolt 60 is
The first clamp 40 and the second clamp 50 are concentrically connected to each other, and when the nut 61 is screwed, they are pulled toward each other. As a result, a predetermined initial load is applied to the mating surface between the upper pipe 10 and the lower pipe 20. When there is a gap between the mating surfaces, the tightening force of the nut 61 is adjusted between the four continuous tightening bolts 60 to apply a uniform initial load to the mating surfaces over the entire circumference.

【0017】連結締結ボルト60の取付けと並行して、
その内側に加熱コイル80をセットする。加熱コイル8
0は半割型であり、その内径は下管10および上管20
の各外径より若干大きくされている。コイル本体81は
角筒状の銅パイプからなり、その下方にはシールドガス
をコイル内側へ供給するための角筒状の環状ガス管82
が設けられている。83は絶縁材、84はシール用充填
剤である。
In parallel with the attachment of the connecting fastening bolt 60,
The heating coil 80 is set inside. Heating coil 8
0 is a half-split type, the inner diameter of which is lower pipe 10 and upper pipe 20.
Is slightly larger than each outer diameter. The coil main body 81 is made of a square tubular copper pipe, and a rectangular tubular annular gas pipe 82 for supplying a shield gas to the inside of the coil is provided below the copper main body 81.
Is provided. Reference numeral 83 is an insulating material, and 84 is a sealing filler.

【0018】4本の連結締付ボルト60の取付けが終了
すると、各ボルトに支持部材70を装着する。各支持部
材70は、2本のボルトにより連結締付ボルト60に把
持状態で取付けられる。各支持部材70には、加熱コイ
ル80を支持する支持台71と、加熱コイル80の径方
向の位置調節を行う調節ボルト72とが設けられてい
る。各支持部材70は、支持台71に支持された加熱コ
イル80のコイル本体81が、下管10と上管20との
合わせ面外側に位置するように、連結締付ボルト60へ
の取付位置が調節され、かつ、その加熱コイル80が下
管10および上管20に対して同心状態となるように、
調節ボルト72にて加熱コイル80の径方向位置が調節
され、これにより、加熱コイル80の熱応力による変形
及び磁力による変形を防止することが可能となる。
When the attachment of the four connecting tightening bolts 60 is completed, the support member 70 is attached to each bolt. Each support member 70 is attached to the connecting tightening bolt 60 in a gripped state with two bolts. Each support member 70 is provided with a support base 71 that supports the heating coil 80, and an adjustment bolt 72 that adjusts the radial position of the heating coil 80. Each support member 70 is attached to the connecting tightening bolt 60 such that the coil body 81 of the heating coil 80 supported by the support 71 is located outside the mating surface between the lower pipe 10 and the upper pipe 20. Is adjusted and its heating coil 80 is concentric with the lower tube 10 and the upper tube 20,
The position of the heating coil 80 in the radial direction is adjusted by the adjusting bolt 72, which makes it possible to prevent the heating coil 80 from being deformed by thermal stress and magnetic force.

【0019】以上のようにして、下管10との上管20
とがクランプされ、且つ、その突き合わせ部に対して加
熱コイル80がセットされると、加熱コイル80に高周
波電流を通じて、突き合わせ部をその合わせ面間に挟ま
れたインサート材の融点以上の温度に加熱する。これに
より、インサート材が溶融すると共に、インサート材を
溶融させるための加熱に伴って突き合わせ部に軸心方向
の熱膨張力が作用する。しかし、突き合わせ部は第1ク
ランプ40および第2クランプ50にて軸心方向に拘束
されているので、軸心方向の熱膨張は生じず、その反力
が合わせ面に接合荷重として付加されて合わせ面が拡散
接合される。そして、この接合に際しては、連結締付ボ
ルト60の締付力の調節により、合わせ面間からギャッ
プが排除され、且つ、支持部材により突き合わせ部に対
して加熱コイルが高精度に位置決めれているので、合わ
せ面における接合荷重および加熱温度分布が均一化さ
れ、優れた接合強度が安定に確保される。
As described above, the lower pipe 10 and the upper pipe 20
When and are clamped and the heating coil 80 is set to the butted portion, a high frequency current is passed through the heating coil 80 to heat the butted portion to a temperature equal to or higher than the melting point of the insert material sandwiched between the mating surfaces. To do. As a result, the insert material is melted, and the thermal expansion force in the axial direction acts on the abutting portion along with the heating for melting the insert material. However, since the butted portion is restrained in the axial direction by the first clamp 40 and the second clamp 50, thermal expansion in the axial direction does not occur, and the reaction force is added to the mating surface as a joining load and The faces are diffusion bonded. At the time of this joining, by adjusting the tightening force of the connecting tightening bolt 60, the gap is eliminated from between the mating surfaces, and the heating coil is accurately positioned with respect to the butted portion by the support member. In addition, the bonding load and heating temperature distribution on the mating surfaces are made uniform, and excellent bonding strength is stably ensured.

【0020】以上の手段で600Aサイズの鋼管杭を実
際に接合した。鋼管杭の詳細な寸法は外径609.6m
m、肉厚30mmである。素材を表1に示す。また、接
合に使用したインサート材の仕様を表2に示し、接合条
件を表3に示す。接合部から採取した試験片にJIS
Z2204に準じる板状曲げ試験を実施したところ、表
曲げ、裏曲げ、側曲げのいずれも良好な結果が得られ、
JISZ2201に準じる板状引張試験(14B号試験
片)では引張強さ53kgf/mm2 (母材破断)が得
られた。
A steel pipe pile of 600 A size was actually joined by the above means. The outer diameter of the steel pipe pile is 609.6m.
m, wall thickness 30 mm. The materials are shown in Table 1. Table 2 shows the specifications of the insert material used for joining, and Table 3 shows the joining conditions. JIS for the test piece taken from the joint
When a plate-shaped bending test according to Z2204 was carried out, good results were obtained in all of front bending, back bending, and side bending.
In the plate-like tensile test (No. 14B test piece) according to JISZ2201, a tensile strength of 53 kgf / mm 2 (base metal fracture) was obtained.

【0021】[0021]

【表1】 [Table 1]

【0022】[0022]

【表2】 [Table 2]

【0023】[0023]

【表3】 [Table 3]

【0024】なお、上記実施例は鋼管杭に対する例であ
るが、本発明は外径が600以上の大中径管の接合に適
用でき、また接合姿勢も縦向きのみならず横向きの場合
も適用可能である。
The above embodiment is an example for a steel pipe pile, but the present invention can be applied to the joining of large and medium diameter pipes having an outer diameter of 600 or more, and the joining posture can be applied not only vertically but also horizontally. It is possible.

【0025】[0025]

【発明の効果】以上の説明から明らかなように、本発明
の管接合方法は、鋼管杭の如き相互接続に長時間を要し
ていた大中径管を、施工現場にて短時間で接合できる。
しかも、接合作業のほとんどが管クランプ等の組立て作
業であり、且つ、その組立て作業を油圧装置によらずに
簡単に短時間で行うことができる。従って、能率的に施
工作業を進めることができる。接合性については、目違
いによる影響等が少なく、ラフな組立てもにかかわら
ず、充分な接合強度が得られる。
As is apparent from the above description, the pipe joining method of the present invention joins large-medium diameter pipes, such as steel pipe piles, which took a long time for interconnection, at a construction site in a short time. it can.
Moreover, most of the joining work is an assembling work such as a pipe clamp, and the assembling work can be easily performed in a short time without using a hydraulic device. Therefore, the construction work can be advanced efficiently. Regarding the bondability, there is little influence due to misalignment, and sufficient bond strength can be obtained regardless of rough assembly.

【0026】本発明の管クランプ装置は、油圧を使用せ
ず小型で支持運搬等から簡単である上に、クランプ、加
熱コイル等が別体となっているので、大中径管に対する
着脱が容易である。また、そのような簡易構造であるに
もかかわらず、連結締付ボルトの締付力の調節により合
せ面のギャップが解消でき、支持部材により加熱コイル
の位置合わせも高精度に行うことができるので、確実で
安定な接合を可能とする。
The pipe clamp device of the present invention is small in size without using hydraulic pressure, is easy to support and carry, and has a clamp, a heating coil, and the like as separate bodies, so that it can be easily attached to and detached from large and medium diameter pipes. Is. Further, despite such a simple structure, the gap between the mating surfaces can be eliminated by adjusting the tightening force of the connecting tightening bolts, and the positioning of the heating coil can be performed with high accuracy by the supporting member. It enables reliable and stable joining.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の管接合方法の一実施態様を示す縦断面
図である。
FIG. 1 is a vertical sectional view showing an embodiment of a pipe joining method of the present invention.

【図2】図1のA−A線矢視図である。FIG. 2 is a view taken along the line AA of FIG.

【図3】図1のB−B線矢視図である。FIG. 3 is a view taken along the line BB of FIG.

【図4】図3のC−C線矢視図である。FIG. 4 is a view taken along the line CC of FIG.

【図5】従来の管接合方法を示す断面図である。FIG. 5 is a cross-sectional view showing a conventional pipe joining method.

【図6】従来の管接合方法における別の管クランプ状態
を示す断面図である。
FIG. 6 is a cross-sectional view showing another state of pipe clamping in the conventional pipe joining method.

【符号の説明】[Explanation of symbols]

10 下管 20 上管 30 ストッパ 40 第1クランプ 50 第2クランプ 60 連結締付ボルト 70 支持部材 80 加熱コイル 10 Lower Pipe 20 Upper Pipe 30 Stopper 40 First Clamp 50 Second Clamp 60 Connection Tightening Bolt 70 Supporting Member 80 Heating Coil

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 一方の大中径管の一端面から僅かに離れ
た管外周面に環状のクランプを装着する一方、該大中径
管に接合される他方の大中径管の一端面から僅かに離れ
た管外周面に前記クランプとは別体の環状のクランプを
装着し、両方の大中径管の端面間にインサート材を挟ん
でその大中径管を突き合わせた状態で、両方のクランプ
を相互に引き寄せて大中径管の突き合わせ部を、前記ク
ランプとは別体の加熱コイルによりインサート材の融点
以上に高周波加熱することを特徴とする管接合方法。
1. An annular clamp is attached to the outer peripheral surface of the pipe slightly separated from one end face of the one large-medium diameter pipe, while one end face of the other large-medium diameter pipe joined to the large-medium diameter pipe is attached. Attach a ring-shaped clamp, which is separate from the above-mentioned clamp, to the outer peripheral surface of the pipes that are slightly away from each other, and insert the insert material between the end faces of both large and medium diameter pipes, but place the large and medium diameter pipes together. A pipe joining method characterized in that the clamps are attracted to each other and the abutting portion of the large-medium diameter pipe is heated by a heating coil separate from the clamp above the melting point of the insert material.
【請求項2】 請求項1の管接合方法に使用する管クラ
ンプ装置であって、加熱コイルおよびそのトランスに対
して別体とされ、一方の大中径管の一端部外周面に締着
される環状の第1クランプと、該第1クランプ、加熱コ
イルおよびそのトランスに対して別体とされ、前記一方
の大中径管に突き合わされる他方の大径管の一端部外周
面に締着される環状の第2クランプと、第1クランプお
よび第2クランプを同心状に連結して相互に引き寄せる
複数本の連結締付ボルトと、該連結締付ボルトに装着さ
れ、大中径管の突き合わせ部を加熱コイルで包囲するべ
く該加熱コイルを支持するコイル支持部材とを具備する
ことを特徴とする管クランプ装置。
2. A pipe clamp device used in the pipe joining method according to claim 1, wherein the pipe is a separate body from the heating coil and its transformer, and is fastened to the outer peripheral surface of one end of one large-medium diameter pipe. And an annular first clamp that is separate from the first clamp, the heating coil, and its transformer, and is fastened to the outer peripheral surface of one end of the other large-diameter pipe that is abutted against the one large-medium-diameter pipe. Ring-shaped second clamp, a plurality of connecting tightening bolts that connect the first clamp and the second clamp in a concentric manner and draw each other, and a large and medium diameter pipe butt fitted to the connecting tightening bolts And a coil support member that supports the heating coil so as to surround the portion with the heating coil.
JP3047596A 1991-02-19 1991-02-19 Pipe joining method and pipe clamp device Expired - Lifetime JP2906700B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3047596A JP2906700B2 (en) 1991-02-19 1991-02-19 Pipe joining method and pipe clamp device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3047596A JP2906700B2 (en) 1991-02-19 1991-02-19 Pipe joining method and pipe clamp device

Publications (2)

Publication Number Publication Date
JPH05131277A true JPH05131277A (en) 1993-05-28
JP2906700B2 JP2906700B2 (en) 1999-06-21

Family

ID=12779630

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3047596A Expired - Lifetime JP2906700B2 (en) 1991-02-19 1991-02-19 Pipe joining method and pipe clamp device

Country Status (1)

Country Link
JP (1) JP2906700B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009272235A (en) * 2008-05-09 2009-11-19 Ntn Corp High-frequency heating coil
CN102728985A (en) * 2012-06-21 2012-10-17 中国十五冶金建设集团有限公司 Butt welding method for thick-wall steel cylinder
CN105880889A (en) * 2014-12-29 2016-08-24 无锡龙舜实业有限公司 Vertical welding machine for water distribution pipes
CN111230397A (en) * 2020-02-28 2020-06-05 潘雪军 Pipeline construction auxiliary pipeline connecting and fixing clamp

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009272235A (en) * 2008-05-09 2009-11-19 Ntn Corp High-frequency heating coil
CN102728985A (en) * 2012-06-21 2012-10-17 中国十五冶金建设集团有限公司 Butt welding method for thick-wall steel cylinder
CN105880889A (en) * 2014-12-29 2016-08-24 无锡龙舜实业有限公司 Vertical welding machine for water distribution pipes
CN111230397A (en) * 2020-02-28 2020-06-05 潘雪军 Pipeline construction auxiliary pipeline connecting and fixing clamp

Also Published As

Publication number Publication date
JP2906700B2 (en) 1999-06-21

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