JP2011255986A - Method for manufacturing crane jib - Google Patents

Method for manufacturing crane jib Download PDF

Info

Publication number
JP2011255986A
JP2011255986A JP2010130265A JP2010130265A JP2011255986A JP 2011255986 A JP2011255986 A JP 2011255986A JP 2010130265 A JP2010130265 A JP 2010130265A JP 2010130265 A JP2010130265 A JP 2010130265A JP 2011255986 A JP2011255986 A JP 2011255986A
Authority
JP
Japan
Prior art keywords
welding
crane jib
support
jib
manufacturing
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.)
Pending
Application number
JP2010130265A
Other languages
Japanese (ja)
Inventor
Toru Moritomo
徹 森友
Masatoshi Hirano
正敏 平野
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy 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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP2010130265A priority Critical patent/JP2011255986A/en
Priority to CN2011101573435A priority patent/CN102267039A/en
Publication of JP2011255986A publication Critical patent/JP2011255986A/en
Pending legal-status Critical Current

Links

Images

Landscapes

  • Jib Cranes (AREA)
  • Arc Welding In General (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)

Abstract

PROBLEM TO BE SOLVED: To facilitate manufacturing of a crane jib.SOLUTION: A method for manufacturing of a crane jib is provided for forming long and hollow support parts 21 serving as a crane jib 2 by welding the long plate members 21b to an opening part of body members 21a with respect to the long body members 21a formed by having a side part opened along the longitudinal direction L. The method includes: a temporary assembling step of temporarily assembling the support parts 21 by welding the plate members 21b to the body members 21a temporarily; a bending step of arranging the two support parts 21 in parallel and binding the two support parts 21 each other while being bent in the directions opposite to the directions of distortion expected in final welding; and a final welding step of carrying out final welding simultaneously to the two support parts 21 while being bound together.

Description

本発明は、クレーンジブを製造するためのクレーンジブ製造方法に関する。   The present invention relates to a crane jib manufacturing method for manufacturing a crane jib.

例えば、デッキクレーンは、固定ポストの上に旋回ポストが旋回可能に設けられている。旋回ポストは、クレーンジブが設けられている。クレーンジブは、長尺の2本の支持部が互いに連結して構成されている。2本の支持部は、各基端が旋回ポストに支持されて上下に揺動可能に設けられている。そして、クレーンジブは、旋回ポストに設けられた俯仰用ウインチによるワイヤの巻き取りまたは繰り出しによって俯仰する(例えば、特許文献1参照)。   For example, in a deck crane, a turning post is provided on a fixed post so as to be turnable. The swivel post is provided with a crane jib. The crane jib is configured by connecting two long support portions to each other. The two support portions are provided so that each base end is supported by a turning post and can swing up and down. The crane jib is lifted by winding or unwinding the wire with a lifting winch provided on the turning post (see, for example, Patent Document 1).

特開平10−101292号公報JP-A-10-101292

ところで、上述した特許文献1に記載されたデッキクレーンのように、2本の支持部からなるクレーンジブは、俯仰のために支持部を軽量化し、かつ剛性を持たせる必要があるので、通常、クレーンジブを構成する一対の支持部は中空の構造体として、軽量化および高剛性化を図っている。   By the way, like the deck crane described in the above-mentioned Patent Document 1, a crane jib composed of two support parts needs to be lightened and stiff for the purpose of raising and lowering. The pair of support portions constituting the structure is a hollow structure to reduce weight and increase rigidity.

この中空長尺の支持部は複数の部材を溶接接合して製造しているが、溶接後、溶接箇所の熱収縮により歪みが生じ、長尺の支持部が湾曲変形する。このため、従来、支持部を拘束、または、逆歪を与えた状態で溶接することで、支持部の湾曲変形を抑える製造方法が採用されているが、依然として湾曲変形が発生するので、溶接後、支持部をガスバーナで加熱、水冷却により歪取りを行っていた。この場合、支持部の形成後に歪みを取る補正作業が必要であった。この結果、クレーンジブを製造するにあたり、多くの手間がかかり、製造コストが嵩むことになる。   The hollow long support portion is manufactured by welding and joining a plurality of members, but after welding, distortion occurs due to thermal contraction of the welded portion, and the long support portion is curved and deformed. For this reason, conventionally, a manufacturing method that suppresses the curved deformation of the support portion by constraining the support portion or welding with a reverse strain applied has been adopted, but since the curved deformation still occurs, The support part was heated with a gas burner and the strain was removed by water cooling. In this case, it is necessary to correct the distortion after forming the support portion. As a result, in manufacturing the crane jib, much labor is required, and the manufacturing cost increases.

本発明は、上述した課題を解決するものであり、クレーンジブを容易に製造することのできるクレーンジブ製造方法を提供することを目的とする。   This invention solves the subject mentioned above, and aims at providing the crane jib manufacturing method which can manufacture a crane jib easily.

上述の目的を達成するために、本発明のクレーンジブ製造方法は、長手方向に沿って側部が開口して形成された長尺の本体部材に対し、当該本体部材の開口部分に長尺の板部材を溶接することでクレーンジブをなす長尺中空の支持部を形成するクレーンジブ製造方法であって、前記本体部材と前記板部材とを仮溶接して前記支持部を仮組みする仮組み工程と、仮組みされた2つの前記支持部を並設して、本溶接による予想歪みの反対方向に曲げを付与した状態で、2つの前記支持部相互を拘束する曲げ工程と、拘束した状態の前記2つの支持部の本溶接を同時施工する本溶接工程と、を含むことを特徴とする。   In order to achieve the above-described object, the crane jib manufacturing method of the present invention has a long plate at the opening portion of the main body member with respect to the long main body member formed by opening the side portion along the longitudinal direction. A crane jib manufacturing method for forming a long hollow support portion that forms a crane jib by welding members, wherein the main body member and the plate member are temporarily welded to temporarily assemble the support portion; and A bending step of restraining the two support portions in a state in which the two temporarily assembled support portions are juxtaposed, and bending is applied in a direction opposite to the expected distortion due to the main welding, and the restrained state of the 2 And a main welding step of simultaneously performing main welding of two support portions.

このクレーンジブ製造方法によれば、支持部を仮組みした状態で、本溶接による予想歪みの反対方向に支持部に対して予め曲げを付与することから、本溶接後の熱収縮による歪みを十分に吸収することが可能である。しかも、仮組みされた2つの支持部を並設して各支持部に対して曲げを付与することから、クレーンジブをなす2つの支持部に対して同等に曲げを付与することが可能である。しかも、本溶接を、2つの支持部に対して同時施工で行うことにより、2つの支持部に対して同等に熱収縮による反対方向歪み応力を生じさせ、1つの支持部毎に溶接する場合に比べ、遥かに直線状にすることが可能となり、拘束を解いた各支持部の歪発生を最小限に止め得る。この結果、クレーンジブを容易に製造することができる。   According to this crane jib manufacturing method, in the state where the support portion is temporarily assembled, the support portion is previously bent in the opposite direction to the expected strain due to the main welding, so that the distortion due to the heat shrinkage after the main welding is sufficient. It is possible to absorb. In addition, since the two temporarily assembled support portions are arranged side by side to bend each support portion, it is possible to equally apply bending to the two support portions forming the crane jib. In addition, when the main welding is performed simultaneously on the two support parts, opposite strain stresses due to thermal shrinkage are equally generated on the two support parts, and welding is performed for each support part. Compared to this, it becomes possible to make the shape much straighter, and the occurrence of distortion in each support portion which has been restrained can be minimized. As a result, the crane jib can be easily manufactured.

また、本発明のクレーンジブ製造方法は、前記本溶接工程後、拘束した状態のまま支持部を回転させ、次に、前記2つの支持部の他の溶接部位の本溶接を同時施工することを特徴とする。   Further, the crane jib manufacturing method of the present invention is characterized in that after the main welding step, the support portion is rotated in a restrained state, and then main welding of other welding portions of the two support portions is simultaneously performed. And

このクレーンジブ製造方法によれば、拘束した状態のまま支持部を回転させることで、本溶接をし易い位置に他の溶接部位を配置できる。このため、本溶接作業を容易に行うことが可能である。この結果、クレーンジブを容易に製造することができる。   According to this crane jib manufacturing method, by rotating the support portion in a constrained state, it is possible to arrange another welding site at a position where it is easy to perform the main welding. For this reason, the main welding operation can be easily performed. As a result, the crane jib can be easily manufactured.

本発明によれば、クレーンジブを容易に製造することができる。   According to the present invention, a crane jib can be easily manufactured.

図1は、本発明の実施の形態に係るクレーンジブを有するデッキクレーンの概略側面図である。FIG. 1 is a schematic side view of a deck crane having a crane jib according to an embodiment of the present invention. 図2は、図1に示すデッキクレーンの概略平面図である。FIG. 2 is a schematic plan view of the deck crane shown in FIG. 図3は、図1に示すデッキクレーンのワイヤを示す概略斜視図である。FIG. 3 is a schematic perspective view showing a wire of the deck crane shown in FIG. 図4は、本発明の実施の形態に係るクレーンジブを示す概略断面図(図2のA−A断面拡大図)である。FIG. 4 is a schematic cross-sectional view (an enlarged cross-sectional view taken along the line AA in FIG. 2) showing the crane jib according to the embodiment of the present invention. 図5は、本発明の実施の形態に係るクレーンジブの製造工程を示す概略図である。FIG. 5 is a schematic view showing a manufacturing process of the crane jib according to the embodiment of the present invention. 図6は、本発明の実施の形態に係るクレーンジブの製造工程を示す概略図である。FIG. 6 is a schematic view showing a manufacturing process of a crane jib according to the embodiment of the present invention. 図7は、本発明の実施の形態に係るクレーンジブの製造工程を示す概略図である。FIG. 7 is a schematic view showing a manufacturing process of a crane jib according to the embodiment of the present invention. 図8は、本発明の実施の形態に係るクレーンジブの製造工程を示す概略図である。FIG. 8 is a schematic view showing a manufacturing process of the crane jib according to the embodiment of the present invention. 図9は、本発明の実施の形態に係るクレーンジブの製造工程を示す概略図である。FIG. 9 is a schematic view showing a manufacturing process of a crane jib according to the embodiment of the present invention. 図10は、本発明の実施の形態に係るクレーンジブの他の製造方法を示す概略図である。FIG. 10 is a schematic view showing another method for manufacturing the crane jib according to the embodiment of the present invention.

以下に、本発明に係る実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。また、下記実施の形態における構成要素には、当業者が置換可能かつ容易なもの、あるいは実質的に同一のものが含まれる。   Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

図1は、本実施の形態に係るクレーンジブを有するデッキクレーンの概略側面図であり、図2は、図1に示すデッキクレーンの概略平面図であり、図3は、図1に示すデッキクレーンのワイヤを示す概略斜視図である。   1 is a schematic side view of a deck crane having a crane jib according to the present embodiment, FIG. 2 is a schematic plan view of the deck crane shown in FIG. 1, and FIG. 3 is a diagram of the deck crane shown in FIG. It is a schematic perspective view which shows a wire.

図1および図2に示すように、デッキクレーンは、旋回ポスト1にクレーンジブ(以下、単にジブと称す)2が設けられている。旋回ポスト1は、デッキ3に固定された固定ポスト4に対して軸心Sの廻りに回転可能に設けられている。この旋回ポスト1は、図示しない駆動機構により軸心Sの廻りに旋回駆動される。   As shown in FIGS. 1 and 2, the deck crane is provided with a crane jib (hereinafter simply referred to as a jib) 2 on a swing post 1. The swivel post 1 is provided to be rotatable around an axis S with respect to the fixed post 4 fixed to the deck 3. The swivel post 1 is swiveled around the axis S by a drive mechanism (not shown).

また、旋回ポスト1は、その下側に、俯仰用ウインチ5および巻上用ウインチ6が設けられている。また、旋回ポスト1は、その上端に、5つの滑車7a〜7eが設けられている。   Further, the swivel post 1 is provided with a lifting winch 5 and a hoisting winch 6 on the lower side thereof. Moreover, the swivel post 1 is provided with five pulleys 7a to 7e at its upper end.

ジブ2は、長尺に形成されている。ジブ2は、その基端が旋回ポスト1の下側に水平な軸2aを介して取り付けられ、上下に揺動可能に設けられている。具体的に、ジブ2は、長尺に形成された2つの支持部21が並設されつつ、連結部22により連結され、平面視、A字状に形成されたもので、各支持部21の基端が軸2aを介して旋回ポスト1に取り付けられている。   The jib 2 is formed long. The jib 2 has a base end attached to the lower side of the swivel post 1 via a horizontal shaft 2a, and is provided so as to be swingable up and down. Specifically, the jib 2 is formed in an A shape in a plan view when two support portions 21 formed in a long shape are connected in parallel and connected by a connection portion 22. The proximal end is attached to the swivel post 1 via a shaft 2a.

また、ジブ2は、その先端上部に、5つの滑車7f〜7jが設けられている。また、ジブ2は、その中間上部に、1つの滑車7kが設けられている。   The jib 2 is provided with five pulleys 7f to 7j at the upper end of the tip. Moreover, the jib 2 is provided with one pulley 7k at the middle upper part thereof.

図3に示すように、俯仰用ウインチ5に巻かれたワイヤ8aは、旋回ポスト1側の滑車7b、ジブ2先端側の滑車7g、旋回ポスト1側の滑車7c、ジブ2中間側の滑車7kの順で架け渡され、先端が旋回ポスト1に固定されている。そして、俯仰用ウインチ5によりワイヤ8aを巻き取ることでワイヤ8aが引っ張られ、ジブ2の先端側の滑車7gおよび中間側の滑車7kが引き上げられる。このため、ジブ2が、軸2aを中心に上方に揺動し、先端が上昇する。一方、俯仰用ウインチ5によりワイヤ8aを繰り出すことでワイヤ8aが弛み、ジブ2の先端側の滑車7gおよび中間側の滑車7kが吊り下ろされる。このため、ジブ2が、軸2aを中心に下方に揺動し、先端が下降する。このように、ジブ2は、俯仰用ウインチ5によるワイヤ8aの巻き上げまたは繰り出しにより俯仰する。   As shown in FIG. 3, the wire 8a wound around the hoisting winch 5 includes a pulley 7b on the turning post 1 side, a pulley 7g on the tip end side of the jib 2, a pulley 7c on the turning post 1 side, and a pulley 7k on the intermediate side of the jib 2. The tip is fixed to the swivel post 1. The wire 8a is pulled up by winding the hoisting winch 5 to pull up the pulley 7g on the tip side of the jib 2 and the pulley 7k on the intermediate side. For this reason, the jib 2 swings upward about the shaft 2a, and the tip rises. On the other hand, when the wire 8a is drawn out by the lifting winch 5, the wire 8a is loosened, and the pulley 7g on the tip side of the jib 2 and the pulley 7k on the intermediate side are suspended. For this reason, the jib 2 swings downward about the shaft 2a, and the tip is lowered. In this way, the jib 2 is lifted by winding or unwinding the wire 8a by the lifting winch 5.

図3に示すように、昇降用ウインチ6に巻かれたワイヤ8bは、旋回ポスト1側の滑車7a、ジブ2先端側の滑車7f、フックなどからなる昇降部材9に設けられた滑車9a、ジブ2先端側の滑車7j、旋回ポスト1側の滑車7e、ジブ2先端側の滑車7i、旋回ポスト1側の滑車7d、ジブ2先端側の滑車7hの順で架け渡され、先端が旋回ポスト1に固定されている。そして、昇降用ウインチ6によりワイヤ8bを巻き取ることでワイヤ8bが引っ張られ、滑車9aが引き上げられる。このため、ジブ2先端下側にて昇降部材9が上昇する。一方、昇降用ウインチ6によりワイヤ8bを繰り出すことでワイヤ8bが弛み、滑車9aが吊り下ろされる。このため、ジブ2先端下側にて昇降部材9が下降する。このように、昇降部材9は、昇降用ウインチ6によるワイヤ8bの巻き上げまたは繰り出しにより昇降する。つまり、昇降部材9に荷(図示せず)を取り付けることで荷を昇降することが可能になる。   As shown in FIG. 3, the wire 8b wound around the lifting winch 6 includes a pulley 7a on the revolving post 1 side, a pulley 7f on the tip end side of the jib 2, a pulley 9a provided on a lifting member 9 including a hook and the like. 2 A pulley 7j on the tip side, a pulley 7e on the swivel post 1 side, a pulley 7i on the tip side of the jib 2, a pulley 7d on the swivel post 1 side, and a pulley 7h on the tip side of the jib 2 are bridged in this order. It is fixed to. And the wire 8b is pulled by winding up the wire 8b with the raising / lowering winch 6, and the pulley 9a is pulled up. For this reason, the elevating member 9 rises at the lower end of the jib 2 tip. On the other hand, when the wire 8b is drawn out by the lifting winch 6, the wire 8b is loosened and the pulley 9a is suspended. For this reason, the elevating member 9 is lowered at the lower end of the jib 2 tip. In this way, the elevating member 9 moves up and down by winding or unwinding the wire 8b by the elevating winch 6. That is, the load can be raised and lowered by attaching a load (not shown) to the lifting member 9.

そして、上述した旋回ポスト1の旋回、ジブ2の俯仰、昇降部材9の昇降により、昇降部材9に取り付けた荷を移動させることが可能である。なお、旋回ポスト1の旋回、ジブ2の俯仰、昇降部材9の昇降は、旋回ポスト1に設けられた操縦室1aでオペレータにより操作される。   And the load attached to the raising / lowering member 9 can be moved by the turning of the turning post 1, the raising / lowering of the jib 2, and the raising / lowering of the raising / lowering member 9. The turning of the turning post 1, the raising / lowering of the jib 2, and the raising / lowering of the elevating member 9 are operated by an operator in the cockpit 1 a provided in the turning post 1.

図4は、本実施の形態に係るクレーンジブを示す概略断面図(図2のA−A断面拡大図)である。図4に示すように、ジブ2を構成する2つの支持部21は、長手方向に沿って側部が開口して形成された略断面コ字形の長尺の本体部材21aと、本体部材21aの開口部分に固定された長尺の板部材21bとで構成されている。このように構成することで、支持部21が長尺中空に形成されるので、ジブ2の軽量化および高剛性化を図ることができる。   FIG. 4 is a schematic cross-sectional view (an enlarged cross-sectional view taken along the line AA in FIG. 2) showing the crane jib according to the present embodiment. As shown in FIG. 4, the two support portions 21 constituting the jib 2 include a long main body member 21 a having a substantially U-shaped cross section formed by opening a side portion along the longitudinal direction, and a main body member 21 a. It is comprised with the elongate board member 21b fixed to the opening part. By comprising in this way, since the support part 21 is formed in elongate hollow, the jib 2 can be reduced in weight and rigidity.

本体部材21aに板部材21bを固定するには、本体部材21aの開口端に開先を設け、この開先部分に板部材21bを溶接10する。ところが、本体部材21aの側部に板部材21bを溶接10により固定すると、溶接10の後の冷却により本体部材21aの側部が収縮して歪みが生じ、側方に弧状に湾曲してしまう。特に、支持部21は、例えば30mほどの長尺であるため、先端と中央部との歪み差が300mmほど生じてしまう。   In order to fix the plate member 21b to the main body member 21a, a groove is provided at the opening end of the main body member 21a, and the plate member 21b is welded 10 to the groove portion. However, when the plate member 21b is fixed to the side portion of the main body member 21a by the welding 10, the side portion of the main body member 21a contracts due to the cooling after the welding 10 and is distorted, and is bent in an arc shape to the side. In particular, since the support portion 21 is about 30 m long, for example, a distortion difference between the tip and the center portion is about 300 mm.

そこで、本実施の形態のクレーンジブ製造方法は、上記の歪みを補正しつつ、容易に支持部21を形成するためのものである。図5〜図9は、本実施の形態に係るクレーンジブの製造工程を示す概略図である。   Therefore, the crane jib manufacturing method of the present embodiment is for easily forming the support portion 21 while correcting the distortion. 5-9 is schematic which shows the manufacturing process of the crane jib which concerns on this Embodiment.

まず、図5に示すように、本体部材21aと板部材21bとを仮溶接11により仮組みする(仮組み工程)。そして、仮組みされた支持部21を2つ用意する。   First, as shown in FIG. 5, the main body member 21a and the plate member 21b are temporarily assembled by temporary welding 11 (temporary assembly step). Then, two temporarily assembled support portions 21 are prepared.

次に、図6に示すように、仮組みされた2つの支持部21を、板部材21b側が相反するように並設しつつ、後の本溶接10による予想歪みの反対方向に支持部21に対して曲げ(逆歪)を付与する(曲げ工程)。この曲げ工程では、保持機構100および水平ジャッキ200が用いられる。   Next, as shown in FIG. 6, the two temporarily assembled support portions 21 are arranged side by side so that the plate member 21 b side is opposite to the support member 21 in the opposite direction of the expected distortion due to the subsequent main welding 10. On the other hand, bending (reverse strain) is applied (bending step). In this bending process, the holding mechanism 100 and the horizontal jack 200 are used.

保持機構100は、作業床に配置されるもので、並設された仮組みの各支持部21の端部を保持する保持部110と、並設された各支持部21の上下を反転させる態様で回転する回転部120とを有する。保持部110は、支持部21の端部を挟むことで支持部21を保持する。回転部120は、保持部110を支持部21の長手方向Lに沿う水平な軸心で回転可能に支える回転架台121と、保持部110に設けた従動ギア122と、モータ123とを備え、モータ123の駆動ギア123aと従動ギア122とをチェーンで接続したものである。この回転部120は、モータ123の駆動により保持部110を回転させることで、保持部110で保持された各支持部21の上下を反転させる。   The holding mechanism 100 is arranged on the work floor, and is a mode in which the holding unit 110 that holds the end portions of the support units 21 of the temporary assembly arranged side by side and the top and bottom of the support units 21 arranged side by side are reversed. And a rotating part 120 that rotates at the same time. The holding part 110 holds the support part 21 by sandwiching the end part of the support part 21. The rotating unit 120 includes a rotating base 121 that rotatably supports the holding unit 110 with a horizontal axis along the longitudinal direction L of the support unit 21, a driven gear 122 provided on the holding unit 110, and a motor 123. 123, a driving gear 123a and a driven gear 122 are connected by a chain. The rotating unit 120 rotates the holding unit 110 by driving the motor 123, thereby inverting the support units 21 held by the holding unit 110.

なお、保持機構100は、支持部21を保持するにあたり、支持部21の端部を挿入したり抜き出したりする態様で支持部21の長手方向Lに沿って移動可能に作業床に設けられていることが好ましい。   Note that the holding mechanism 100 is provided on the work floor so as to be movable along the longitudinal direction L of the support portion 21 in such a manner that the end portion of the support portion 21 is inserted or extracted when holding the support portion 21. It is preferable.

水平ジャッキ200は、並設された仮組みの各支持部21の間であって、長手方向Lの中央部分に配置される。そして、水平ジャッキ200を伸長させることで、保持機構100により端部が保持された各支持部21の中央部分が離反し、当該各支持部21に対して曲げを付与する。上記水平ジャッキ200に代えて隙間保持具を2つの支持部21間に挟み込み設置してもよい、要するに、2つの支持部21間の中央部に隙間を空けた状態で、両支持部21相互を拘束する。   The horizontal jack 200 is disposed between the support portions 21 of the temporary assembly provided side by side, and is disposed at the center portion in the longitudinal direction L. Then, by extending the horizontal jack 200, the central portion of each support portion 21 whose end is held by the holding mechanism 100 is separated, and bending is applied to each support portion 21. Instead of the horizontal jack 200, a gap holder may be sandwiched and installed between the two support portions 21. In short, the support portions 21 are connected to each other in a state where a gap is left in the center between the two support portions 21. to bound.

次に、図7に示すように、本体部材21aと板部材21bとの本溶接10を支持部21の長手方向Lに沿って2つの支持部21に対して共に行う(本溶接工程)。この本溶接工程では、多電極溶接装置300が用いられる。   Next, as shown in FIG. 7, the main welding 10 between the main body member 21 a and the plate member 21 b is performed on the two support portions 21 along the longitudinal direction L of the support portion 21 (main welding step). In this main welding process, a multi-electrode welding apparatus 300 is used.

多電極溶接装置300は、多電極溶接法の1つは、MAG溶接の高能率化を目的としたもので、複数(本実施の形態では2つ)の溶接トーチを具え、隣接する各支持部21の溶接部位に沿って走行し、同時にアークを発生させる。この多電極溶接装置300は、長手方向Lに沿うレール(図示せず)上に移動可能に配置されており、長手方向Lに沿って連続して本溶接10を行うことが可能である。すなわち、多電極溶接装置300を図6に示す位置から図7に示す位置に移動させることで、長手方向Lに沿って各支持部21に対して同期して本溶接10を行う。一対の溶接トーチは長手方向Lに直交する幅方向に移動可能となっており、各支持部21の溶接部位に沿って移動し溶接を行う。   The multi-electrode welding apparatus 300 is one of the multi-electrode welding methods for the purpose of improving the efficiency of MAG welding, and includes a plurality of (two in this embodiment) welding torches, and adjacent support portions It travels along the welding part 21 and generates an arc at the same time. The multi-electrode welding apparatus 300 is arranged so as to be movable on a rail (not shown) along the longitudinal direction L, and can perform the main welding 10 continuously along the longitudinal direction L. That is, the main welding 10 is performed in synchronization with each support portion 21 along the longitudinal direction L by moving the multi-electrode welding apparatus 300 from the position shown in FIG. 6 to the position shown in FIG. The pair of welding torches is movable in the width direction orthogonal to the longitudinal direction L, and moves along the welding portion of each support portion 21 to perform welding.

この本溶接工程は、支持部21の長手方向Lに沿って所定の溶接部位の本溶接10を行った後、図8に示すように、保持機構100により各支持部21を回転させ、図7同様に、各支持部21の長手方向Lに沿う他の溶接部位の本溶接10を行う。図4に示すように、支持部21は、本体部材21aの開口部分の上側縁(所定の溶接部位)と下側縁(他の溶接部位)とに板部材21bが固定される。したがって、本体部材21aの上側縁における本溶接10を行った後は、各支持部21を上下に反転(180度回転)させる必要がある。そこで、保持機構100の回転部120によって各支持部21を回転させる。   In this main welding step, after performing main welding 10 at a predetermined welding site along the longitudinal direction L of the support portion 21, as shown in FIG. 8, each support portion 21 is rotated by the holding mechanism 100, and FIG. Similarly, the main welding 10 of the other welding part along the longitudinal direction L of each support part 21 is performed. As shown in FIG. 4, the plate member 21b is fixed to the upper edge (predetermined welding part) and the lower edge (other welding part) of the opening part of the main body member 21a. Therefore, after performing the main welding 10 at the upper edge of the main body member 21a, it is necessary to reverse each support portion 21 up and down (rotate 180 degrees). Therefore, each support portion 21 is rotated by the rotation portion 120 of the holding mechanism 100.

そして、全ての溶接部位の本溶接10を行った後は、水平ジャッキ200を取り外す。このため、図9に示すように、各支持部21の熱収縮による歪みにより、曲げ工程での曲げとは逆に湾曲することで、各支持部21が長手方向Lに沿って直線状になる。なお、この場合、保持機構100による各支持部21の保持を外し、保持機構100により各支持部21を支える程度とする。   And after performing the main welding 10 of all the welding parts, the horizontal jack 200 is removed. For this reason, as shown in FIG. 9, each support portion 21 is linearly formed along the longitudinal direction L by bending opposite to the bending in the bending process due to distortion caused by thermal contraction of each support portion 21. . In this case, the holding portions 100 are not held by the holding mechanism 100 and are supported by the holding mechanism 100.

ところで、上述した実施の形態では、仮組みされた2つの支持部21を、板部材21b側が相反するように並設しつつ、後の本溶接10による予想歪みの反対方向に支持部21に対して曲げを付与し、本溶接10を行っているが、この限りではない。   By the way, in the above-described embodiment, the two temporarily assembled support portions 21 are arranged side by side so that the plate member 21b side is opposite to the support portion 21 in the opposite direction of the expected distortion due to the subsequent main welding 10. However, the present welding 10 is performed, but not limited to this.

図10は、本実施の形態に係るクレーンジブの他の製造方法を示す概略図である。図10に示すように、曲げ工程において、仮組みされた2つの支持部21を、板部材21b側が向き合うように並設しつつ、後の本溶接10による予想歪みの反対方向に支持部21に対して曲げ(逆歪)を付与してもよい。この場合、各支持部21の中央部を拘束治具201で拘束すると共に、両端部に水平ジャッキ200が配置され、この水平ジャッキ200を伸長させることで、保持機構100により端部が保持された各支持部21の端部が離反し、当該各支持部21に対して曲げを付与する。なお、図には明示しないが、上記水平ジャッキ200に代えて、隙間保持具を2つの支持部21の両端部に挟み込み設置してもよい。要するに、2つの支持部21間の両端部に隙間を空けて、両支持部21の中央部を近づけるように隙間が無い状態(または、スペーサ12を介在した状態)で拘束する。この場合での両支持部21中央部の拘束は、両支持部21の中央部に設けた拘束治具201で固定するか、または、両板部材21b相互を冶具(図示せず)で挟み込み固定すればよい。   FIG. 10 is a schematic view showing another method for manufacturing a crane jib according to the present embodiment. As shown in FIG. 10, in the bending process, the two temporarily assembled support portions 21 are arranged side by side so that the plate member 21 b faces each other, and the support portion 21 is opposite to the expected strain due to the subsequent main welding 10. On the other hand, bending (reverse strain) may be applied. In this case, the center portion of each support portion 21 is restrained by the restraining jig 201, and the horizontal jacks 200 are disposed at both ends, and the end portions are held by the holding mechanism 100 by extending the horizontal jacks 200. The end portions of the support portions 21 are separated from each other, and bending is applied to the support portions 21. Although not clearly shown in the drawing, a gap holder may be sandwiched between the two support portions 21 in place of the horizontal jack 200 described above. In short, a gap is formed at both end portions between the two support portions 21, and the two support portions 21 are restrained in a state where there is no gap (or a state in which the spacer 12 is interposed) so that the center portions of the two support portions 21 are brought closer. In this case, the restraint at the center part of both support parts 21 is fixed by a restraining jig 201 provided at the center part of both support parts 21, or both plate members 21b are sandwiched and fixed by a jig (not shown). do it.

また、仮組み工程および本溶接工程については、上述と同様である。   The temporary assembly process and the main welding process are the same as described above.

なお、図10において、並設された仮組みの各支持部21の間であって、長手方向Lの中央部分に配置されたものは、スペーサ12であって、板部材21b同士の接触による傷付きを防ぐものである。   In FIG. 10, between the support portions 21 of the temporary assembly arranged side by side and disposed in the center portion in the longitudinal direction L is the spacer 12 and is a scratch caused by contact between the plate members 21b. This is to prevent sticking.

なお、本体部材21aは、略断面コ字形として図示して説明したが、この限りではない。本体部材21aは、側部が開口して形成された長尺のもので、その開口部分に板部材21bを固定することで、ジブ2の軽量化および高剛性化を図れればよい。例えば、本体部材21aは、略断面U字形や略断面C字形状などであってもよい。また、板部材21bも平板でなくてもよく、断面形状が湾曲や屈曲したものであってもよい。   Although the main body member 21a has been illustrated and described as a substantially U-shaped cross section, this is not restrictive. The main body member 21a is a long one formed by opening a side portion, and it is only necessary to reduce the weight and rigidity of the jib 2 by fixing the plate member 21b to the opening portion. For example, the main body member 21a may have a substantially U-shaped section or a C-shaped section. Further, the plate member 21b may not be a flat plate, and the cross-sectional shape may be curved or bent.

上述したように、本実施の形態のクレーンジブ製造方法は、長手方向Lに沿って側部が開口して形成された長尺の本体部材21aに対し、当該本体部材21aの開口部分に長尺の板部材21bを溶接することでクレーンジブ2をなす長尺中空の支持部21を形成するクレーンジブ製造方法である。そして、本体部材21aと板部材21bとを仮溶接して支持部21を仮組みする仮組み工程と、仮組みされた2つの支持部21を並設して、本溶接10による予想歪みの反対方向に曲げを付与した状態で、2つの支持部21相互を拘束する曲げ工程と、拘束した状態の2つの支持部21の本溶接を同時施工する本溶接工程とを含む。なお、本溶接工程は、本体部材21aと板部材21bとの本溶接10を、支持部21の長手方向に沿って2つの支持部21に対して共に行うことを含む。   As described above, in the crane jib manufacturing method of the present embodiment, the long main body member 21a formed by opening the side portion along the longitudinal direction L is long in the opening portion of the main body member 21a. It is a crane jib manufacturing method which forms the long hollow support part 21 which makes the crane jib 2 by welding the plate member 21b. Then, a temporary assembly step of temporarily welding the main body member 21 a and the plate member 21 b to temporarily assemble the support portion 21, and the two temporarily assembled support portions 21 are arranged side by side to oppose the expected distortion due to the main welding 10. The bending process which restrains the two support parts 21 mutually in the state which provided the bending in the direction, and the main welding process which performs the main welding of the two support parts 21 of the restrained state simultaneously are included. The main welding process includes performing the main welding 10 between the main body member 21 a and the plate member 21 b together on the two support portions 21 along the longitudinal direction of the support portion 21.

このクレーンジブ製造方法によれば、支持部21を仮組みした状態で、本溶接10による予想歪みの反対方向に支持部21に対して予め曲げを付与することから、本溶接10後の熱収縮による歪みを十分に吸収することが可能である。しかも、仮組みされた2つの支持部21を並設しつつ各支持部21に対して曲げを付与することから、ジブ2をなす2つの支持部21に対して同等に曲げを付与することが可能である。しかも、本溶接10を、2つの支持部21に対して同時施工で行うことにより、2つの支持部21に対して同等に熱収縮による反対方向歪み応力を生じさせ、1つの支持部21毎に溶接する場合に比べ、遥かに直線状にすることが可能となり、拘束を解いた各支持部21の歪発生を最小限に止め得る。この結果、クレーンジブを容易に製造することができる。   According to this crane jib manufacturing method, in a state where the support portion 21 is temporarily assembled, the support portion 21 is previously bent in the direction opposite to the expected strain due to the main welding 10. It is possible to absorb the distortion sufficiently. Moreover, since the bending is applied to each support portion 21 while the two temporarily assembled support portions 21 are arranged side by side, the bending can be equally applied to the two support portions 21 forming the jib 2. Is possible. In addition, by performing the main welding 10 on the two support portions 21 by simultaneous construction, opposite strain stresses due to thermal shrinkage are equally generated on the two support portions 21, and for each one support portion 21. Compared with the case of welding, it becomes possible to make it far linear, and it is possible to minimize the occurrence of distortion of each support portion 21 that has been unconstrained. As a result, the crane jib can be easily manufactured.

また、本実施の形態のクレーンジブ製造方法は、本溶接工程後、拘束した状態のまま支持部21を回転させ、次に、2つの支持部21の他の溶接部位の本溶接を同時施工する。すなわち、本溶接工程では、各支持部21の長手方向Lに沿って所定の溶接部位の本溶接10を行った後、並設した各支持部21を保持する態様で作業床に配置された保持機構100により各支持部21を回転させ、各支持部21の長手方向Lに沿って他の溶接部位の本溶接10を行うことを含む。   Moreover, the crane jib manufacturing method of this Embodiment rotates the support part 21 in the restrained state after a main welding process, and then performs the main welding of the other welding part of the two support parts 21 simultaneously. That is, in the main welding process, after performing the main welding 10 at a predetermined welding site along the longitudinal direction L of each support portion 21, the holding disposed in the work floor in a mode of holding the support portions 21 arranged side by side. Each of the support portions 21 is rotated by the mechanism 100, and the main welding 10 of another welding site is performed along the longitudinal direction L of each support portion 21.

このクレーンジブ製造方法によれば、拘束した状態のまま支持部21を回転させることで、本溶接10をし易い位置に他の溶接部位を配置できる。このため、本溶接10の作業を容易に行うことが可能である。この結果、クレーンジブを容易に製造することができる。なお、保持機構100により各支持部21を保持しつつ、当該保持機構100により支持部21を回転させることで、本溶接10をし易い位置に他の溶接部位を配置できる。このため、本溶接作業を容易に行うことが可能である。しかも、作業床に設置されて各支持部21を保持する保持機構100を適用することで、クレーンなどで吊り上げて支持部21を回転させることがなく、本溶接作業を容易に行うことが可能である。この結果、クレーンジブを容易に製造することが可能になる。   According to this crane jib manufacturing method, by rotating the support portion 21 while being constrained, it is possible to place another welded portion at a position where the main welding 10 can be easily performed. For this reason, the work of the main welding 10 can be easily performed. As a result, the crane jib can be easily manufactured. In addition, another holding part can be arrange | positioned in the position where main welding 10 is easy by rotating the support part 21 with the said holding mechanism 100, hold | maintaining each support part 21 with the holding mechanism 100. FIG. For this reason, the main welding operation can be easily performed. In addition, by applying the holding mechanism 100 that is installed on the work floor and holds the support portions 21, the main welding work can be easily performed without lifting the support portions 21 by lifting them with a crane or the like. is there. As a result, the crane jib can be easily manufactured.

なお、上述した実施の形態のクレーンジブ製造方法では、ジブ2を有するクレーンとしてデッキクレーンを一例として説明したが、この限りではなく、支持部21から構成されるジブ2を有するクレーン全てに適用される。   In the crane jib manufacturing method according to the above-described embodiment, the deck crane is described as an example of the crane having the jib 2, but the present invention is not limited to this, and the crane jib manufacturing method is applicable to all cranes having the jib 2 configured by the support portion 21. .

以上のように、本発明に係るクレーンジブ製造方法は、クレーンジブを容易に製造することに適している。   As mentioned above, the crane jib manufacturing method which concerns on this invention is suitable for manufacturing a crane jib easily.

2 クレーンジブ(ジブ)
21 支持部
21a 本体部材
21b 板部材
10 溶接(本溶接)
11 仮溶接
12 スペーサ
100 保持機構
110 保持部
120 回転部
121 回転架台
122 従動ギア
123 モータ
123a 駆動ギア
200 水平ジャッキ
201 拘束治具
300 多電極溶接装置
L 支持部の長手方向
2 Crane jib (jib)
21 support part 21a body member 21b plate member 10 welding (main welding)
DESCRIPTION OF SYMBOLS 11 Temporary welding 12 Spacer 100 Holding mechanism 110 Holding part 120 Rotating part 121 Rotating mount 122 Driven gear 123 Motor 123a Drive gear 200 Horizontal jack 201 Restraint jig 300 Multi-electrode welding apparatus L Longitudinal direction of supporting part

Claims (2)

長手方向に沿って側部が開口して形成された長尺の本体部材に対し、当該本体部材の開口部分に長尺の板部材を溶接することでクレーンジブをなす長尺中空の支持部を形成するクレーンジブ製造方法であって、
前記本体部材と前記板部材とを仮溶接して前記支持部を仮組みする仮組み工程と、
仮組みされた2つの前記支持部を並設して、本溶接による予想歪みの反対方向に曲げを付与した状態で、2つの前記支持部相互を拘束する曲げ工程と、
拘束した状態の前記2つの支持部の本溶接を同時施工する本溶接工程と、
を含むことを特徴とするクレーンジブ製造方法。
A long hollow support part that forms a crane jib is formed by welding a long plate member to the opening part of the main body member for a long main body member that is formed by opening the side part along the longitudinal direction. A crane jib manufacturing method,
A temporary assembling step of temporarily welding the support member by temporarily welding the main body member and the plate member;
A bending step of constraining the two support portions in a state where the two support portions temporarily assembled are arranged side by side, and bending is applied in a direction opposite to the expected strain due to the main welding;
A main welding process for simultaneously performing main welding of the two supporting portions in a restrained state;
Crane jib manufacturing method characterized by including.
前記本溶接工程後、拘束した状態のまま支持部を回転させ、次に、前記2つの支持部の他の溶接部位の本溶接を同時施工することを特徴とする請求項1に記載のクレーンジブ製造方法。   2. The crane jib manufacturing according to claim 1, wherein after the main welding process, the support portion is rotated in a constrained state, and then the main welding of the other welding portions of the two support portions is simultaneously performed. Method.
JP2010130265A 2010-06-07 2010-06-07 Method for manufacturing crane jib Pending JP2011255986A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2010130265A JP2011255986A (en) 2010-06-07 2010-06-07 Method for manufacturing crane jib
CN2011101573435A CN102267039A (en) 2010-06-07 2011-06-07 Manufacturing method for radial arm of crane

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010130265A JP2011255986A (en) 2010-06-07 2010-06-07 Method for manufacturing crane jib

Publications (1)

Publication Number Publication Date
JP2011255986A true JP2011255986A (en) 2011-12-22

Family

ID=45049602

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2010130265A Pending JP2011255986A (en) 2010-06-07 2010-06-07 Method for manufacturing crane jib

Country Status (2)

Country Link
JP (1) JP2011255986A (en)
CN (1) CN102267039A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160036990A (en) * 2014-09-26 2016-04-05 한국고벨주식회사 Jig for crane girder and girder manufacture
CN110482420A (en) * 2019-08-16 2019-11-22 南通振华重型装备制造有限公司 A kind of floating crane truss-type cantilever crane integral constructing method

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102699497B (en) * 2012-05-07 2014-09-24 河南省矿山起重机有限公司 Crane main beam welding machine
CN102837161B (en) * 2012-09-04 2015-04-22 南阳二机石油装备(集团)有限公司 Manufacturing method and positioning and clamping device of telescopic boom body of crane

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54127833U (en) * 1978-02-27 1979-09-06
JPH08200549A (en) * 1995-01-23 1996-08-06 Mitsubishi Heavy Ind Ltd Header-coupling-jig setting system
JPH10201547A (en) * 1997-01-24 1998-08-04 Astec Irie:Kk Production of rack for storehouse
JP2000016763A (en) * 1998-06-26 2000-01-18 Tadano Ltd Crane boom
JP2002103033A (en) * 2000-09-28 2002-04-09 Furukawa Co Ltd Manufacturing method of prismatic cylinder

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2128628Y (en) * 1992-05-11 1993-03-24 陶鹤龄 Thin-wall curved combination beam for crane
JPH10101292A (en) * 1996-09-30 1998-04-21 Tsuji Sangyo Kk Deck crane for stevedoring
CN201092526Y (en) * 2007-05-23 2008-07-30 上海国际港务(集团)股份有限公司军工路分公司 Handling arm for fork lifter
CN101125400A (en) * 2007-09-28 2008-02-20 天津二十冶建设有限公司 Welding anti-distortion processing method for iron component
CN201436129U (en) * 2009-07-21 2010-04-07 上海洪铺钢结构工程有限公司 Overtuning jig for controlling welding deformation of the

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54127833U (en) * 1978-02-27 1979-09-06
JPH08200549A (en) * 1995-01-23 1996-08-06 Mitsubishi Heavy Ind Ltd Header-coupling-jig setting system
JPH10201547A (en) * 1997-01-24 1998-08-04 Astec Irie:Kk Production of rack for storehouse
JP2000016763A (en) * 1998-06-26 2000-01-18 Tadano Ltd Crane boom
JP2002103033A (en) * 2000-09-28 2002-04-09 Furukawa Co Ltd Manufacturing method of prismatic cylinder

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160036990A (en) * 2014-09-26 2016-04-05 한국고벨주식회사 Jig for crane girder and girder manufacture
KR101626791B1 (en) 2014-09-26 2016-06-02 한국고벨(주) Jig for crane girder and girder manufacture
CN110482420A (en) * 2019-08-16 2019-11-22 南通振华重型装备制造有限公司 A kind of floating crane truss-type cantilever crane integral constructing method

Also Published As

Publication number Publication date
CN102267039A (en) 2011-12-07

Similar Documents

Publication Publication Date Title
JP7013192B2 (en) Crane and jib assembly method
JP2011255986A (en) Method for manufacturing crane jib
JP5026936B2 (en) Derrick for steel tower assembly / disassembly and removal method
JP2012036667A (en) Device and method for assembling reinforcement cage
JP5595242B2 (en) Crane post manufacturing method
US10526176B2 (en) Crane assembling method
JP6170829B2 (en) Column connector system
JP6468447B2 (en) Method for raising and lowering undulating member, and crane
JP6645222B2 (en) How to attach a crane jib
JP5717419B2 (en) Mobile crane and method of assembling mobile crane
JPH10102823A (en) Derrick device for replacing work for cross arm of transmission tower and replacing method for cross arm using the same
CN210012519U (en) Climbing device and self-climbing crane
JP6638434B2 (en) Crane boom mounting method
JP5185728B2 (en) Pile driver recombination method
JP2009062173A (en) Lifting device of automated warehouse
JP2012017160A (en) Structural object manufacturing apparatus, crane jib and crane jib manufacturing method
CN113636511A (en) Encircling supporting device for overturning process of ultra-long concrete prefabricated part
JP5838503B2 (en) Assembling crane
JP6658020B2 (en) Crane and crane assembling method
CN108643022B (en) Movable road bridge and road bridge vehicle
KR20190103494A (en) Rotating post for vehicle-mounted crane
JP6334458B2 (en) crane
JP5158697B2 (en) Plate body reversing equipment
JP6246707B2 (en) Boom mounting device and crane
CN115028080A (en) Movable motor hoisting device and method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20130410

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20140306

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20140318

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20140708