JP5323233B1 - Pillar member for crane front attachment - Google Patents

Pillar member for crane front attachment Download PDF

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JP5323233B1
JP5323233B1 JP2012150253A JP2012150253A JP5323233B1 JP 5323233 B1 JP5323233 B1 JP 5323233B1 JP 2012150253 A JP2012150253 A JP 2012150253A JP 2012150253 A JP2012150253 A JP 2012150253A JP 5323233 B1 JP5323233 B1 JP 5323233B1
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哲行 寺内
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Ｉｈｉ建機株式会社
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Abstract

【課題】クレーンのフロントアタッチメント用柱部材の強度低下を防止すると共に製作の手間と製作コストとを減らす。
【解決手段】荷重点と支点を直線状に結ぶ２本の主部材１１を並列に設置して、該２本の主部材１１に対向させて、上記主部材１１よりも断面積の小さい補助部材１２を設ける。又、対向して設けられる補助部材１２と主部材１１との間、及び、上記主部材１１同士の間に、上記主部材１１よりも断面積の小さい複数のラチス用部材１３をジグザグ状に設ける。各主部材１１に屈曲部をなくすことができるので、該屈曲部に基づく応力集中などが各主部材１１に生じるのを防止することができ、よって、強度を低下させてしまうのを防止することができる。又、各主部材１１に曲げ加工を行ったり、主部材同士の溶接接続を行ったりする必要がないので、作業者の手間と製作コストを減らすことができる。
【選択図】図１An object of the present invention is to prevent a reduction in strength of a pillar member for a front attachment of a crane and to reduce manufacturing effort and manufacturing cost.
An auxiliary member having a cross-sectional area smaller than that of the main member 11 in which two main members 11 connecting the load point and the fulcrum in a straight line are installed in parallel and opposed to the two main members 11. 12 is provided. Further, a plurality of lattice members 13 having a smaller cross-sectional area than the main member 11 are provided in a zigzag manner between the auxiliary member 12 and the main member 11 provided opposite to each other and between the main members 11. . Since each main member 11 can have no bent portion, stress concentration based on the bent portion can be prevented from occurring in each main member 11, thereby preventing the strength from being lowered. Can do. In addition, since it is not necessary to bend each main member 11 or perform welding connection between the main members, it is possible to reduce labor and manufacturing cost of the operator.
[Selection] Figure 1

Description

本発明は、クレーンのフロントアタッチメント（作業装置）に用いられるブーム、ジブ、ストラットなどのフロントアタッチメント用柱部材に関するものである。   The present invention relates to a front attachment column member such as a boom, jib, or strut used in a front attachment (working apparatus) of a crane.

クレーンの一例としての移動式クレーンは、一般的に、下部走行体上に搭載した上部旋回体の前端部にフロントアタッチメント用柱部材としてのブームを上下方向へ回動可能に連結して、該ブームと上記上部旋回体との間に、ブーム起伏装置と巻上装置を装備するようにしてある。   A mobile crane as an example of a crane is generally connected to a front end portion of an upper swinging body mounted on a lower traveling body so that a boom as a front attachment pillar member is pivotably movable in the vertical direction. A boom hoisting device and a hoisting device are provided between the upper revolving unit and the upper revolving unit.

このような移動式クレーンに連結されるブームとしては、軽量化を図ったラチス構造のブームが主流になってきている。   As a boom connected to such a mobile crane, a boom having a lattice structure for reducing the weight has become mainstream.

図６は従来のクレーンのフロントアタッチメント用柱部材としてのラチス構造ブームの一例を示すもので、基端部と先端部とを屈曲させた４本の主部材（コード）２を、屈曲部を内側に向けた状態で前後左右の４方に等間隔で設置して、基端部と先端部を角錐形状として四角柱形状とすると共に、該４本の主部材２同士の間を、ラチス用部材（ブレス）３により接続するようにした構成としてある。なお、図中４はガイドシーブ、５はポイントシーブ、６はペンダントロープ、７はブーム起伏装置、８は巻上装置、９は上部旋回体である。   FIG. 6 shows an example of a lattice boom as a conventional pillar member for a front attachment of a crane. Four main members (cords) 2 having a base end portion and a tip end portion bent, and a bent portion inside. Are installed at equal intervals in the front, rear, left and right directions, and the base end portion and the tip end portion are formed into a quadrangular prism shape with a pyramid shape, and a lattice member is formed between the four main members 2. (Breath) 3 is connected. In the figure, 4 is a guide sheave, 5 is a point sheave, 6 is a pendant rope, 7 is a boom hoisting device, 8 is a hoisting device, and 9 is an upper swing body.

これにより、四角柱形状のブーム１の基端部を上部旋回体９に連結した状態で上記ブーム起伏装置７を作動させることにより、ラチス構造として軽量化したブーム１を容易に起伏させることができるようにし、クレーンの吊能力の向上などを図るようにしている（たとえば、特許文献１参照）。   Accordingly, by operating the boom hoisting device 7 in a state where the base end portion of the quadrangular prism-shaped boom 1 is connected to the upper swing body 9, the boom 1 reduced in weight as a lattice structure can be easily raised and lowered. In this way, the crane's lifting ability is improved (for example, see Patent Document 1).

又、図示してないが、クレーンのフロントアタッチメント用柱部材としてのジブ、ストラットなどにおいても、特許文献１に記載されたブームと同様にラチス構造を採用して、該ジブ、ストラットなどの軽量化を図っているものがある（たとえば、特許文献２参照）。   Further, although not shown, a jib, strut, etc. as a pillar member for a front attachment of a crane adopts a lattice structure in the same manner as the boom described in Patent Document 1, thereby reducing the weight of the jib, strut, etc. (For example, refer to Patent Document 2).

特開平１１−４３２８８号公報Japanese Patent Laid-Open No. 11-43288 特開２０１０−２４７９５４号公報JP 2010-247554 A

ところが、上記特許文献１，２に記載されたもののように、クレーンのフロントアタッチメント用柱部材（ブーム、ジブ、ストラットなど）における主部材２の先端部や基端部に屈曲部を設けてしまうと、曲げ加工や溶接加工にて該屈曲部を形成する際に主部材２に生じる残留応力や、クレーン作業時に屈曲部に生じる応力集中などが影響して、フロントアタッチメント用柱部材の強度の低下を招いてしまう。   However, like the ones described in Patent Documents 1 and 2, if a bent portion is provided at the distal end portion or the proximal end portion of the main member 2 in a pillar member (boom, jib, strut, etc.) for front attachment of a crane. The strength of the front attachment column member is reduced by the residual stress generated in the main member 2 when the bent portion is formed by bending or welding, or the stress concentration generated in the bent portion during crane work. I will invite you.

又、上記特許文献１，２に記載されたようなラチス構造のフロントアタッチメント用柱部材では、主部材２の先端部と基端部に屈曲部を設けるために４本の主部材２に曲げ加工を行ったり、主部材２同士の溶接接続を行ったりする必要があるため、フロントアタッチメント用柱部材の製作に手間が掛かると共に製作コストも掛かってしまう。   In addition, in the lattice member for a front attachment having a lattice structure as described in Patent Documents 1 and 2, the four main members 2 are bent in order to provide bent portions at the distal end portion and the proximal end portion of the main member 2. Since it is necessary to perform welding and to connect the main members 2 to each other, it takes time and effort to produce the front attachment column member.

そこで、本発明は、強度低下を防止すると共に製作の手間と製作コストとを減らせることができるようにしたクレーンのフロントアタッチメント用柱部材を提供しようとするものである。   Therefore, the present invention is intended to provide a pillar member for a front attachment of a crane that can prevent the strength from being lowered and reduce the labor and cost of production.

本発明は、上記課題を解決するために、請求項１に対応して、荷重点を１箇所とし、支点を１箇所とする柱部材であり、該荷重点と支点とを直線状に結ぶ２本の主部材を並列に設けて、該各主部材よりも断面積の小さい補助部材を上記主部材に対向させて設けると共に、該対向して設けられる補助部材と主部材との間、及び、上記主部材同士の間に、それぞれ複数のラチス用部材を設けるようにしてなり、且つ上記荷重点に支持軸を設けて、該支持軸に、ペンダントロープの連結を行わせるようにした構成とする。 The present invention, in order to solve the above problems, in correspondence to claim 1, the load point and one point is a pillar member to one position the pivot, connecting the said load point and the fulcrum linearly 2 the main member of the book provided in parallel, provided with a small auxiliary member cross-sectional area than the respective main member is opposed to the main member, between the auxiliary member and the main member provided in the opposite and, between each other the main member, respectively become be provided with a plurality of lattice members, and the support shaft provided in the load point, to the support shaft, a configuration which is adapted to perform connection pendant rope .

又、請求項２に対応して、上記構成における荷重点に設けた支持軸に、シーブの支持を行わせるようにした構成とする。 Further, in response to claim 2, the support shaft provided on the load point in the above configuration, a configuration which is adapted to perform supporting lifting sieve.

更に、請求項３に対応して、上記構成において、クレーンで作業を行う際の向きが、主部材側が上方、補助部材側が下方になるように１箇所の支点で連結するようにした構成とする。 Furthermore, corresponding to claim 3, in the above-described configuration, the crane is connected at one fulcrum so that the main member side is upward and the auxiliary member side is downward when working with the crane. .

本発明のクレーンのフロントアタッチメント用柱部材によれば、以下の如き優れた効果を発揮する。
（１）荷重点を１箇所とし、支点を１箇所とする柱部材であり、該荷重点と支点とを直線状に結ぶ２本の主部材を並列に設けて、該各主部材よりも断面積の小さい補助部材を上記主部材に対向させて設けると共に、該対向して設けられる補助部材と主部材との間、及び、上記主部材同士の間に、それぞれ複数のラチス用部材を設けるようにしてなり、且つ上記荷重点に支持軸を設けて、該支持軸に、ペンダントロープの連結を行わせるようにした構成としてあるので、各主部材に屈曲部をなくすことができ、曲げ加工による残留応力や、屈曲部に基づく応力集中などが各主部材に生じるのを防止することができる。よって、クレーンのフロントアタッチメント用柱部材の強度を低下させてしまうのを防止することができる。又、各主部材に曲げ加工を行ったり、主部材同士の溶接接続を行ったりする必要がないので、クレーンのフロントアタッチメント用柱部材を製作する作業者の手間と製作コストを減らすことができる。更に、荷重点と支点を主部材により直線状に結ぶようにしてあるので、上記荷重点に作用する外力を各主部材に圧縮荷重として作用させることができる。よって、補助部材を、主部材よりも断面積を小さくしたり、主部材よりも強度（引張り強さ）が低い材質にしたりすることができ、製作コストも減らすことができる。更に又、複数のラチス用部材を、対向して設けられる補助部材と主部材との間、及び、上記主部材同士の間にそれぞれ設けるようにしてあるので、各主部材の座屈を防止することができる。
（２）又、荷重点に支持軸を設けて、該支持軸に、ペンダントロープの連結を行わせるようにしたり、又、支持軸に、シーブの支持を行わせるようにした構成としてあるので、ペンダントロープに作用する張力における主部材の軸心方向の分力、及び、シーブを介して加わる外力における主部材の軸心方向の分力を、主部材に圧縮荷重として作用させることができる。よって、上記各分力が主部材に偏心荷重として作用するのを防止することができるので、該偏心荷重に基づく曲げモーメントが主部材に生じるのを防止することができる。
（３）更に、クレーンで作業を行う際の向きが、主部材側が上方、補助部材側が下方になるように１箇所の支点で連結するようにした構成としてあるので、クレーンのフロントアタッチメント用柱部材の自重を、主部材に圧縮力、補助部材に引張力として作用させることができる。よって、補助部材に、圧縮方向の力が作用しないようにしてあるので、補助部材の曲げ剛性を小さく設定することができる。
According to the pillar member for a front attachment of a crane of the present invention, the following excellent effects are exhibited.
(1) the load point and one point, a column member to one position the pivot, the two main members connecting the said load point and the fulcrum linearly provided in parallel, the cross-sectional than the respective main member a small auxiliary member in area provided with to face the said main member, between the auxiliary member and the main member provided in the opposing, and, between the adjacent the main member, so that each provide a plurality of lattice members And a support shaft is provided at the load point, and a pendant rope is connected to the support shaft, so that each main member can be eliminated by bending, and by bending Residual stress and stress concentration based on the bent portion can be prevented from occurring in each main member. Therefore, it is possible to prevent the strength of the column member for the front attachment of the crane from being lowered. Further, since it is not necessary to bend each main member or perform welding connection between the main members, it is possible to reduce the labor and manufacturing cost of the operator who manufactures the column member for the front attachment of the crane. Furthermore, since the load point and the fulcrum are connected linearly by the main member, the external force acting on the load point can be applied to each main member as a compressive load. Therefore, the auxiliary member can be made smaller in cross-sectional area than the main member, or can be made of a material whose strength (tensile strength) is lower than that of the main member, and the manufacturing cost can be reduced. Furthermore, since a plurality of lattice members are provided between the auxiliary member and the main member provided opposite to each other and between the main members, buckling of each main member is prevented. be able to.
(2) Since a support shaft is provided at the load point and the support shaft is connected to the pendant rope , or the support shaft is configured to support the sheave . The component force in the axial direction of the main member in the tension acting on the pendant rope and the component force in the axial direction of the main member in the external force applied through the sheave can be applied to the main member as a compressive load. Therefore, each of the component forces can be prevented from acting on the main member as an eccentric load, so that a bending moment based on the eccentric load can be prevented from occurring in the main member.
(3) Further, since the construction is such that the orientation when working with the crane is connected at one fulcrum so that the main member side is upward and the auxiliary member side is downward, the pillar member for the front attachment of the crane The self-weight can act as a compressive force on the main member and as a tensile force on the auxiliary member. Accordingly, since the force in the compression direction is not applied to the auxiliary member, the bending rigidity of the auxiliary member can be set small.

本発明のクレーンのフロントアタッチメント用柱部材の実施の一形態を示す概略斜視図である。It is a schematic perspective view which shows one Embodiment of the pillar member for front attachments of the crane of this invention. （イ）は図１の概略正面図、（ロ）は（イ）の概略側面図である。(A) is a schematic front view of FIG. 1, (b) is a schematic side view of (a). 図２（ロ）のＡ−Ａ方向拡大切断面図である。FIG. 3 is an AA direction enlarged sectional view of FIG. 本発明のクレーンのフロントアタッチメント用柱部材をブームに適用した場合の一例を示す概略側面図である。It is a schematic side view which shows an example at the time of applying the pillar member for front attachments of the crane of this invention to a boom. 本発明のクレーンのフロントアタッチメント用柱部材をストラットに適用した場合の一例を示す概略側面図である。It is a schematic side view which shows an example at the time of applying the pillar member for front attachments of the crane of this invention to a strut. 従来のクレーンのフロントアタッチメント用柱部材としてのブームの一例を示す概略側面図である。It is a schematic side view which shows an example of the boom as a pillar member for the front attachment of the conventional crane.

以下、本発明を実施するための形態を図面を参照して説明する。   Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

図１及至図３は本発明のクレーンのフロントアタッチメント用柱部材の実施の一形態を示すもので、荷重点と支点を直線状に結ぶ２本の主部材１１を並列に設置して、該２本の主部材１１に対向させて、上記主部材１１よりも断面積の小さい２本の補助部材１２を設けると共に、該対向して設けられる補助部材１２と主部材１１との間、及び、上記主部材１１同士の間に、上記主部材１１よりも断面積の小さい複数のラチス用部材１３をジグザグ状に設けるようにした構成とする。   FIGS. 1 to 3 show an embodiment of a pillar member for a front attachment of a crane according to the present invention. Two main members 11 for connecting a load point and a fulcrum in a straight line are installed in parallel. The two auxiliary members 12 having a smaller cross-sectional area than the main member 11 are provided to face the main member 11, and between the auxiliary member 12 and the main member 11 provided opposite to each other, and the above A plurality of lattice members 13 having a smaller cross-sectional area than the main member 11 are provided in a zigzag manner between the main members 11.

詳述すると、上記２本の主部材１１は、図２（イ）（ロ）に示す如く、該各主部材１１の荷重点と支点となる位置を直線状に結ぶ長さとして、該２本の主部材１１間が、支点側から荷重点側に向けて徐々に幅狭になるように並列に設置するようにしてあり、該主部材１１の上記荷重点となる位置には、該２本の主部材１１により支持される支持軸１４を設けて、図示してないシーブやペンダントロープなどを連結できるようにしてある。これにより、上記支持軸１４に連結した図示してないシーブやペンダントロープなどを介して、フロントアタッチメント用柱部材１０に作用する外力を、上記荷重点より各主部材１１に作用させるようにして、該外力を２本の主部材１１に圧縮荷重として受けさせるようにしてある。又、上記各主部材１１における上記支点となる位置には、上記支持軸１４の軸心方向と平行に連通する貫通孔１５を連結部として設けるようにしてある。これにより、フロントアタッチメント用柱部材１０を、図示してない上部旋回台やブームなどに、上記貫通孔１５に挿通させる図示してないピンなどを介して回動可能に連結できるようにしてある。なお、２本の主部材１１には、上記したように外力に基づく圧縮荷重を受けさせるようにしてあるので、各主部材１１には、圧縮荷重に耐えられる断面積、強度（引張り強さ）を備えさせるようにしてある。各主部材１１の材質は、引張り強度や降伏応力の高い材質、たとえば、高張力鋼製とすることが好ましい。   More specifically, as shown in FIGS. 2 (A) and 2 (B), the two main members 11 have a length that linearly connects a load point and a fulcrum position of each main member 11. The main members 11 are arranged in parallel so that the width gradually decreases from the fulcrum side toward the load point side. A support shaft 14 supported by the main member 11 is provided so that a sheave or a pendant rope (not shown) can be connected. Thereby, an external force acting on the front attachment column member 10 is applied to each main member 11 from the load point via a sheave or a pendant rope (not shown) connected to the support shaft 14. The external force is applied to the two main members 11 as a compressive load. Further, a through hole 15 that communicates in parallel with the axial direction of the support shaft 14 is provided as a connecting portion at a position serving as the fulcrum in each main member 11. As a result, the front attachment column member 10 can be pivotably connected to an upper swivel or a boom (not shown) via a pin (not shown) inserted through the through hole 15. Since the two main members 11 are subjected to a compressive load based on an external force as described above, each main member 11 has a cross-sectional area and strength (tensile strength) that can withstand the compressive load. It is made to prepare. The material of each main member 11 is preferably made of a material having high tensile strength and yield stress, for example, high tensile steel.

一方、上記２本の補助部材１２は、図２（イ）（ロ）に示す如く、上記２本の主部材１１よりも長さを短くするようにしてあると共に、図３に示す如く、上記２本の主部材１１よりも断面積を小さく設定するようにして、上記２本の主部材１１に対向させて設置するようにしてある。なお、上記補助部材１２には、上記したような外力に基づく圧縮荷重が理論上作用しないようにしてあるので、補助部材１２は、強度の低い材質、たとえば一般構造用圧延鋼製としても構わないため、製作コストを減らすことができる。   On the other hand, the two auxiliary members 12 are made shorter than the two main members 11 as shown in FIGS. 2A and 2B, and as shown in FIG. The cross-sectional area is set smaller than that of the two main members 11, and the two main members 11 are set to face each other. In addition, since the compressive load based on the above external force does not act theoretically on the auxiliary member 12, the auxiliary member 12 may be made of a material having low strength, for example, general structural rolled steel. Therefore, the manufacturing cost can be reduced.

又、上記ラチス用部材１３は、断面形状については図示してないが断面積を上記２本の主部材１１よりも小さくするようにしてあり、図２（イ）に示す如く、主部材１１同士の間に、ラチス用部材１３の接続間隔が座屈強度を満足する範囲内になるようにジグザグ状に複数設けるようにしてある。又、上記ラチス用部材１３は、図２（ロ）に示す如く、上記対向させて設けた補助部材１２と主部材１１との間に、ラチス用部材１３の接続間隔が座屈強度を満足する範囲内になるようにジグザグ状に複数設けるようにしてある。これにより、各主部材１１が、該主部材１１に作用する圧縮方向の力により座屈してしまうのを防止するようにしてある。   The lattice member 13 is not shown in cross-sectional shape, but has a smaller cross-sectional area than the two main members 11, and as shown in FIG. In the meantime, a plurality of zigzags are provided so that the connection interval of the lattice members 13 is within a range satisfying the buckling strength. Further, as shown in FIG. 2 (b), the lattice member 13 has a buckling strength because the connection interval of the lattice member 13 is between the auxiliary member 12 and the main member 11 provided to face each other. A plurality of zigzags are provided so as to be within the range. Thereby, each main member 11 is prevented from buckling due to the force in the compression direction acting on the main member 11.

なお、図中１６は、補助部材１２の一端部同士の間、他端部同士の間にそれぞれ設けられる端部接続用部材である。   In the figure, reference numeral 16 denotes an end connecting member provided between one end portions of the auxiliary member 12 and between the other end portions.

かかる構成のクレーンのフロントアタッチメント用柱部材１０を、クレーンのブームに適用する場合、たとえば、図４に示す如く、上記構成における支持軸１４に、ポイントシーブ１７を支持させる共に、該支持軸１４におけるポイントシーブ１７と各主部材１１との間に、ペンダントロープ１８を連結し、且つクレーンで作業を行う際のブーム１０ａの向きが、上記主部材１１側が上方、補助部材１２側が下方となるように、上記各主部材１１の貫通孔１５に挿通させた図示してないフートピンを介して上部旋回体１９に連結するようにする。なお、図中２０はブーム起伏装置、２１は巻上装置の巻上ワイヤロープである。   When the pillar member 10 for a front attachment of a crane having such a configuration is applied to a boom of a crane, for example, as shown in FIG. The pendant rope 18 is connected between the point sheave 17 and each main member 11, and the direction of the boom 10a when working with a crane is such that the main member 11 side is upward and the auxiliary member 12 side is downward. The upper revolving body 19 is connected via a foot pin (not shown) inserted through the through hole 15 of each main member 11. In the figure, 20 is a boom hoisting device, and 21 is a hoisting wire rope of the hoisting device.

かかる構成において、図４に示す如く、上記ブーム起伏装置２０を作動させてブーム１０ａを起立させると、該ブーム１０ａの自重が、ブーム１０ａに作用することになる。このとき、主部材１１側が上方、補助部材１２側が下方に配置された状態になっているので、各主部材１１に圧縮力、各補助部材１２に引張力が生じることになる。又、ブーム１０ａを起立させた状態で吊作業を行うと、主部材１１の支持軸１４にペンダントロープ１８及びポイントシーブ１７を取り付けるようにしてあるので、ペンダントロープ１８に作用する張力における主部材１１の軸心方向の分力、及び、吊荷重における主部材１１の軸心方向の分力を、２本の主部材１１に圧縮荷重として作用させることができる。このように、補助部材１２は、圧縮方向の力が作用しないようにしてあり、座屈の問題を生じないため補助部材１２の曲げ剛性を小さく設定することができる。   In such a configuration, as shown in FIG. 4, when the boom hoisting device 20 is operated to raise the boom 10a, the weight of the boom 10a acts on the boom 10a. At this time, since the main member 11 side is arranged upward and the auxiliary member 12 side is arranged downward, a compressive force is generated in each main member 11 and a tensile force is generated in each auxiliary member 12. Further, when the suspension work is performed with the boom 10a upright, the pendant rope 18 and the point sheave 17 are attached to the support shaft 14 of the main member 11, so that the main member 11 at a tension acting on the pendant rope 18 is applied. The component force in the axial direction and the component force in the axial direction of the main member 11 in the suspension load can be applied to the two main members 11 as a compressive load. As described above, the auxiliary member 12 is configured so that no force in the compression direction acts on the auxiliary member 12, and the bending rigidity of the auxiliary member 12 can be set small because the problem of buckling does not occur.

一方、図１及至図３に示したクレーンのフロントアタッチメント用柱部材１０を、クレーンのストラットに適用する場合、たとえば、図５に示す如く、クレーンで作業を行う際のフロントアタッチメント用柱部材１０としてのリヤストラット１０ｂを主部材１１の貫通孔１５に挿通させたピン２２を介してブーム２３に連結するようにすると共に、クレーンで作業を行う際のフロントアタッチメント用柱部材１０としてのフロントストラット１０ｃを主部材１１の貫通孔１５に挿通させたピン２２を介してブーム２３に連結するようにする。又、上記リヤストラット１０ｂの支持軸１４には、シーブ２４を支持させるようにすると共に、該リヤストラット１０ｂの支持軸１４におけるシーブ２４と各主部材１１との間には、ブーム２３の図示してない基端部に一端部を連結させたペンダントロープ２５の他端部を連結するようにする。更に、上記フロントストラット１０ｃの支持軸１４には、シーブ２４を支持させるようにすると共に、該フロントストラット１０ｃの支持軸１４におけるシーブ２４と各主部材１１との間には、ジブ２６の図示してない先端部に一端部を連結させたジブ起伏用ペンダントロープ２７の他端部を連結するようにする。なお、図中２８は上記各シーブ２４に掛け回されたジブ起伏用ワイヤロープである。   On the other hand, when the crane front attachment column member 10 shown in FIGS. 1 to 3 is applied to a crane strut, for example, as shown in FIG. 5, as a column member 10 for front attachment when working with a crane. The rear strut 10b is connected to the boom 23 via a pin 22 inserted through the through hole 15 of the main member 11, and a front strut 10c as a front attachment column member 10 when working with a crane is provided. It connects with the boom 23 through the pin 22 inserted in the through-hole 15 of the main member 11. Further, the support shaft 14 of the rear strut 10b supports the sheave 24, and the boom 23 is illustrated between the sheave 24 and the main members 11 of the support shaft 14 of the rear strut 10b. The other end of the pendant rope 25 having one end connected to the base end that is not connected is connected. Further, the sheave 24 is supported on the support shaft 14 of the front strut 10c, and a jib 26 is illustrated between the sheave 24 and each main member 11 of the support shaft 14 of the front strut 10c. The other end portion of the jib hoisting pendant rope 27 having one end portion connected to the leading end portion is not connected. In the figure, reference numeral 28 denotes a jib hoisting wire rope hung around each sheave 24.

かかる構成において、図示してないジブ起伏装置を作動させて上記ジブ起伏用ワイヤロープ２８の巻き取りを行うと、図５に示す如く、上記フロントストラット１０ｃが倒伏されるので、ジブ２６を起立させることになる。このとき、リヤストラット１０ｂに外力が作用することになるが、リヤストラット１０ｂの支持軸１４にペンダントロープ２５及びシーブ２４を取り付けるようにしてあるので、上記外力におけるリヤストラット１０ｂの主部材軸心方向の分力を、該リヤストラット１０ｂの２本の主部材１１に圧縮荷重として作用させることができる。又、ジブ２６を起立させた状態で吊作業を行うと、リヤストラット１０ｂ、フロントストラット１０ｃに外力が作用することになるが、リヤストラット１０ｂ、フロントストラット１０ｃの支持軸１４にペンダントロープ２５，２７及びシーブ２４を取り付けるようにしてあるので、上記外力における主部材１１の軸心方向分力を、リヤストラット１０ｂ、フロントストラット１０ｃの２本の主部材１１にそれぞれ圧縮荷重として受けさせることができる。したがって、補助部材１２には、上記外力に基づく圧縮荷重が作用しないようにしてあるので、補助部材１２の曲げ剛性を小さく設定することができる。   In such a configuration, when the jib hoisting device (not shown) is operated to wind the jib hoisting wire rope 28, the front strut 10c is laid down as shown in FIG. It will be. At this time, an external force acts on the rear strut 10b, but since the pendant rope 25 and the sheave 24 are attached to the support shaft 14 of the rear strut 10b, the main member axial direction of the rear strut 10b at the above external force is used. Can be applied as a compressive load to the two main members 11 of the rear strut 10b. Further, when the hanging work is performed with the jib 26 standing, an external force is applied to the rear strut 10b and the front strut 10c. Since the sheave 24 is attached, the component force in the axial direction of the main member 11 due to the external force can be applied to the two main members 11 of the rear strut 10b and the front strut 10c as compressive loads. Therefore, since the compressive load based on the external force does not act on the auxiliary member 12, the bending rigidity of the auxiliary member 12 can be set small.

このように、本発明のクレーンのフロントアタッチメント用柱部材によれば、荷重点と支点を直線状に結ぶ２本の主部材１１を並列に設置して、該２本の主部材１１に対向させて、上記主部材１１よりも断面積の小さい補助部材１２を設けると共に、該対向して設けられる補助部材１２と主部材１１との間、及び、上記主部材１１同士の間に、上記主部材１１よりも断面積の小さい複数のラチス用部材１３をジグザグ状に設けるようにした構成としてあるので、各主部材１１に屈曲部をなくすことができ、曲げ加工による残留応力や、屈曲部に基づく応力集中などが各主部材１１に生じるのを防止することができる。よって、クレーンのフロントアタッチメント用柱部材１０の強度を低下させてしまうのを防止することができる。   Thus, according to the pillar member for a front attachment of the crane of the present invention, the two main members 11 that connect the load point and the fulcrum in a straight line are installed in parallel and are opposed to the two main members 11. In addition, the auxiliary member 12 having a smaller cross-sectional area than the main member 11 is provided, and the main member is interposed between the auxiliary member 12 and the main member 11 provided opposite to each other and between the main members 11. Since the plurality of lattice members 13 having a cross-sectional area smaller than 11 are provided in a zigzag shape, each main member 11 can have no bent portion, and can be based on residual stress due to bending or the bent portion. Stress concentration and the like can be prevented from occurring in each main member 11. Therefore, it can prevent that the intensity | strength of the pillar member 10 for front attachments of a crane will be reduced.

又、各主部材１１に曲げ加工を行ったり、主部材１１同士の溶接接続を行ったりする必要がないので、クレーンのフロントアタッチメント用柱部材１０を製作する作業者の手間と製作コストを減らすことができる。   Further, since it is not necessary to bend each main member 11 or to perform welding connection between the main members 11, it is possible to reduce labor and manufacturing cost of an operator who manufactures the column member 10 for the front attachment of the crane. Can do.

更に、荷重点と支点を主部材により直線状に結ぶようにしてあるので、上記荷重点に作用する外力を各主部材１１に圧縮荷重として作用させることができる。よって、補助部材１２を、主部材１１よりも断面積を小さくしたり、強度が低い材質にしたりすることができ、製作コストを減らすことができる。   Furthermore, since the load point and the fulcrum are connected linearly by the main member, an external force acting on the load point can be applied to each main member 11 as a compressive load. Therefore, the auxiliary member 12 can be made smaller in cross-sectional area than the main member 11 or made of a material having a low strength, and the manufacturing cost can be reduced.

更に又、複数のラチス用部材１３を、対向して設けられる補助部材１２と主部材１１との間、及び、上記主部材１１同士の間にそれぞれ設けるようにしてあるので、各主部材１１の座屈を防止することができる。   Furthermore, since the plurality of lattice members 13 are provided between the auxiliary member 12 and the main member 11 provided opposite to each other and between the main members 11, Buckling can be prevented.

なお、上記実施の形態では、本発明のクレーンのフロントアタッチメント用柱部材を、一例として、ブーム、ストラットにそれぞれ適用した場合について説明したが、これに限られるものではなく、ジブ、マストなど他のクレーンのフロントアタッチメント用柱部材に適用するようにしてもよい。   In the above-described embodiment, the case where the pillar member for front attachment of a crane according to the present invention is applied to a boom and a strut as an example has been described. However, the present invention is not limited to this, and other members such as a jib and a mast are used. You may make it apply to the pillar member for front attachments of a crane.

又、本発明のクレーンのフロントアタッチメント用柱部材のブーム、ストラットに対する適用の仕方は、図４、図５に示した形態に限られるものではない。   The method of applying the pillar member for front attachment of the crane of the present invention to the boom and strut is not limited to the form shown in FIGS.

更に、上記実施の形態では、補助部材１２の両端部間に、端部接続用部材１６を設けるようにしてあるが、設けるのを省略したり、設ける位置や本数を変更したりしてもよい。   Furthermore, in the above-described embodiment, the end connection member 16 is provided between the both end portions of the auxiliary member 12. However, the provision of the end connection member 16 may be omitted, or the position and number of the auxiliary member 12 may be changed. .

又、上記の実施の形態では、補助部材１２を２本の主部材１１にそれぞれ対向させて設けるようにした場合を示したが、補助部材１２は１本のみとして２本の主部材１１との間に複数のラチス用部材１３を設けるようにしてもよい。   In the above embodiment, the auxiliary member 12 is provided so as to be opposed to the two main members 11. However, the auxiliary member 12 is only one and is connected to the two main members 11. A plurality of lattice members 13 may be provided therebetween.

更に又、ラチス用部材１３を設ける本数は、適宜変更するようにしてもよいこと、その他本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Furthermore, the number of the lattice members 13 provided may be changed as appropriate, and various changes may be made without departing from the scope of the present invention.

１１ 主部材
１２ 補助部材
１３ ラチス用部材
１７ ポイントシーブ（シーブ）
１８ ペンダントロープ
２４ シーブ
２５ ペンダントロープ
２７ ジブ起伏用ペンダントロープ（ペンダントロープ） 11 Main member 12 Auxiliary member 13 Lattice member 17 Point sheave
18 Pendant rope 24 Sheave 25 Pendant rope 27 Jib undulation pendant rope (Pendant rope)

Claims (3)

荷重点を１箇所とし、支点を１箇所とする柱部材であり、該荷重点と支点とを直線状に結ぶ２本の主部材を並列に設けて、該各主部材よりも断面積の小さい補助部材を上記主部材に対向させて設けると共に、該対向して設けられる補助部材と主部材との間、及び、上記主部材同士の間に、それぞれ複数のラチス用部材を設けるようにしてなり、且つ上記荷重点に支持軸を設けて、該支持軸に、ペンダントロープの連結を行わせるようにした構成を有することを特徴とするクレーンのフロントアタッチメント用柱部材。 The load point and one point, a column member to one position the pivot, the two main members connecting the said load point and the fulcrum linearly arranged in parallel, a small cross-sectional area than the respective main member an auxiliary member provided with to face the said main member, between the auxiliary member and the main member provided in the opposing, and, between the adjacent the main member, respectively become be provided with a plurality of lattice members A pillar member for a front attachment of a crane having a configuration in which a support shaft is provided at the load point, and a pendant rope is connected to the support shaft . 荷重点に設けた支持軸に、シーブの支持を行わせるようにした請求項１記載のクレーンのフロントアタッチメント用柱部材。 A support shaft provided to the load point, claim 1 crane front attachment for pole member according to the so as to perform a supporting lifting sieve. クレーンで作業を行う際の向きが、主部材側が上方、補助部材側が下方になるように１箇所の支点で連結するようにした請求項１又は２記載のクレーンのフロントアタッチメント用柱部材。 The column member for a front attachment of a crane according to claim 1 or 2, wherein the crane is connected at one fulcrum so that the main member side is upward and the auxiliary member side is downward when working with the crane.
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Publication number Priority date Publication date Assignee Title
CN106494999A (en) * 2016-12-13 2017-03-15 常守祥 A kind of light crane girder

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JPS60100390U (en) * 1983-12-14 1985-07-09 株式会社　多田野鉄工所 Variable tilt device for auxiliary jib in hydraulic telescopic boom with auxiliary jib
JP2002053290A (en) * 2000-08-09 2002-02-19 Ishikawajima Harima Heavy Ind Co Ltd Jib crane

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Publication number Priority date Publication date Assignee Title
JPS60100390U (en) * 1983-12-14 1985-07-09 株式会社　多田野鉄工所 Variable tilt device for auxiliary jib in hydraulic telescopic boom with auxiliary jib
JP2002053290A (en) * 2000-08-09 2002-02-19 Ishikawajima Harima Heavy Ind Co Ltd Jib crane

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106494999A (en) * 2016-12-13 2017-03-15 常守祥 A kind of light crane girder

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