JP3568893B2 - Kelly bar guide device for pile driver - Google Patents

Description

が成立する。ここで、
Ｏ：ケリーバ８の重心位置
Ｆ_Ｂ ：支持フレーム１２の下端部に対しての左側から負荷される力
Ｆ_Ｈ ：引掛に起因する力
Ｌ：ケリーバ８の上端部と支持フレーム１２の下端部との間の距離
Ｌ_Ｄ ：ケリーバ８の重心位置Ｏと支持フレーム１２の下端部との間の距離
Ｌ_Ｆ ：回転駆動装置１０の下端部とケリーバ８の下端部間の距離
Ｌ_Ｔ ：回転駆動装置１０の上下間の距離
【００１１】
上記３式から
【数２】

及び
【００１２】
【数３】

が得られる。
【００１３】
そこで、従来、図１０に示すように、ケリーバ８を上下に円滑に移動させるため、前記支持フレーム１２を上方へ延設し、この延設部１２ａ上端部に上部ガイド２０を設け、上記支点距離Ｌ_Ｔ を長く取り、そして、前記ｆａ及びｆｂの力を小さく形成している。この場合は該ケリーバ８の上下動の円滑性は期待できるが、前記図８に示すようにケリーバ８を下降させて前記掘削孔１８を掘削するときには、該ケリーバ８に設けた前記ストッパ８ａは前記回転駆動装置１０によって停止されるため、図８に示す杭打機の場合に比し該ストッパ８ａの地上高が高い位置となる。依って、該掘削孔１８の深さが浅くなると云う欠陥を有する。
【００１４】
更に又、前記図７乃至図９に示す杭打機１に比し前記延設部１２ａ及び上部ガイド２０を有するため、フレーム質量が杭打機１を転倒させる方向へ作用する。従って、補助作業時の吊上げ得る荷重を小さく設定しなければならなくなる。更に、杭打機１の全質量も前記延設部１２ａ及び上部ガイド２０相当分だけ重くなり、機械の機動性を欠如することになる。
【００１５】
而して、ケリーバ８が回転駆動装置１０に引掛して上下動できなくなった場合は、オペレータはブーム４の操作を停止し、そして、支持フレーム１２を起伏シリンダ１３の操作にて該引掛状況を判断し乍ら前後動させることにより該引掛を外し、そして、ケリーバ８の上下動を可能にしているのであるが、この操作はブーム４の起伏操作と、鉄筋１９等の吊り荷の吊り込み操作時における上部旋回体３の左右方向への旋回操作に加え、前述したようにケリーバ８の引掛状況の把握等が相俟ってオペレータに極度の精神的疲労と注意力不足とを招来し、作業が危険な状態に陥ることがある。
【００１６】
又、前記図１０に示す方式にあっては、オペレータはケリーバ８の引掛状況を気にする必要がないため作業は安全に実施できるが、前述したように杭打機の転倒等の危険が発生し、オペレータに前述した注意力とは異なる別の注意力や或いは掘削深さが浅くなるため、長いケリーバ８を必要とする等の使用制限が別に付与されることになる。
【００１７】
そこで、杭打機による掘削作業が終了し、掘削孔に鉄筋等を吊り込むための補助作業を行うときケリーバの回転駆動装置への引掛を防止し、且つ、機体の質量を付加することなく掘削孔の深さを充分に保持すると共に、土砂の排出高さも確保して掘削作業に支障を来さないようにした杭打機のケリーバガイド装置を得るために解決せられるべき技術的課題が生じてくるのであり、本発明は該課題を解決することを目的とする。
【００１８】
【課題を解決するための手段】
この発明は上記目的を達成するために提案せられたものであり、機械本体にブーム又はジブが起伏自在に取り付けられ、ウインチから繰り出され、且つ、該ブーム又はジブの頂部を介して垂下されるケリーバ吊りロープにケリーバが懸吊されており、一方、該ケリーバの下端部に取り付けられる掘削バケット等を回転駆動し、且つ、該ケリーバを上下動自在に嵌合している回転駆動装置が支持フレームの下方部位にて支持されている杭打機に於いて、前記支持フレームの上端部に前後回動自在にケリーバガイドを配設し、杭打機の掘削作業終了後、掘削孔に鉄筋等の吊り込み作業を行うとき、該ケリーバをブーム又はジブ側に引き寄せて静止させ、前記ケリーバガイドを該ケリーバ側に回動させて該ケリーバガイドをケリーバに当接させることにより、該ケリーバのこじりを防止してケリーバが円滑に上下動できるように構成されたことを特徴とする杭打機のケリーバガイド装置、及び、上記ケリーバガイドはキャビン内に設けられているスイッチにて前後回動動作が実施されるように構成されて成る杭打機のケリーバガイド装置を提供するものである。
【００１９】
【発明の実施の形態】
以下、本発明の一実施の形態を図１乃至図６に従って詳述する。尚、従来例と対象部分は同一符号を付してその説明を省略する。
【００２０】
図１に於いて、ケリーバ８及び該ケリーバ８の下端部に取り付けられる掘削バケットを回転駆動し、且つ、該ケリーバ８の上下動を許容するようにして該ケリーバ８を嵌合するための回転駆動装置１０は、従来例に於いても説明したように支持フレーム１２の下方部位で支持されており、更に、該支持フレーム１２は上部旋回体３の前方部位に配設されている起伏シリンダ１３の伸縮動作によって前後回動するフロントフレーム１４の上端部に固設されている。但し、該支持フレーム１２は前記ケリーバ８と概して平行状態を維持する姿勢で該フロントフレーム１４に固設されることは当然である。
【００２１】
而して、本発明に於いては、前記支持フレーム１２の上端部に前後回動自在に形成されたケリーバガイド２１が取り付けられている。該ケリーバガイド２１は図２乃至図４に示すように、前記支持フレーム１２の上面左右にブラケット２２，２２が対峙して突設されており、各ブラケット２２，２２の上端部内側面に左右対峙してガイドアーム２３，２３が配設され、該ガイドアーム２３，２３の夫々の基部を軸片２４に固設し、該軸片２４を該ブラケット２２，２２に枢着することにより、該ガイドアーム２３，２３が該ブラケット２２，２２に対して前後回動自在に構成されている。更に又、該ガイドアーム２３，２３の先端部にはローラ状の前記ケリーバガイド２１が軸２５により回転自在に設けられている。
【００２２】
又、前記軸片２４と支持フレーム１２との間にシリンダ２６及び戻しバネ２７が配設されている。該シリンダ２６は補助作業を実施するとき、該シリンダ２６へ圧油を供給して該シリンダ２６を伸長し、この動作により該ガイドアーム２３，２３が前方へ回動してローラ状のケリーバガイド２１がケリーバ８に当接する。
【００２３】
従って、ケリーバ８は前記回転駆動装置１０と該ケリーバガイド２１の双方に於いて支持される。斯くして、前記補助作業時に於いて、ブーム４を旋回動作したり、或いは起伏動作したりするときケリーバ８がこじれ、そして、回転駆動装置１０に対して引掛すると云うことがなくなる。又、掘削孔１８の掘削作業時に於いては、該シリンダ２６への圧油をタンク内に環流させることにより前記戻しバネ２７にて該ガイドアーム２３，２３を反対側へ引き戻してケリーバガイド２１をケリーバ８から退避させる。斯くして、掘削作業時に於いてはケリーバ８は円滑に上下して掘削孔１８の掘削作業が実施される。
【００２４】
又、前記シリンダ２６を伸縮操作自在のものを用いることにより、前記戻しバネ２７は省略することもできる。
【００２５】
尚、図示例では前記シリンダ２６のシリンダロッド２６ｂの先端部を前記軸片２４に固設した作動アーム２８の先端部に枢着し、そして、該作動アーム２８を介して該シリンダ２６の駆動を該ガイドアーム２３，２３に伝達するように構成されているが、之に限定せられるものではない。
【００２６】
尚、該シリンダ２６と戻しバネ２７の動作について図４を参照して説明する。図に於いて、補助作業選択スイッチ２９がキャビン１６内に設けられている。そこで、キャビン１６内に於いてオペレータが該補助作業選択スイッチ２９をオンすれば、電磁切換弁３０をＡ位置に切換え、そして、タンク３１内の圧油を油圧ポンプ３２によって前記シリンダ２６内に供給し、該シリンダ２６のシリンダロッド２６ｂを突出させて前記ケリーバガイド２１をケリーバ８側（図１に於いて実線方向）へ回動させ、そして、該ケリーバガイド２１をケリーバ８に当接する。斯くして、補助作業時に於いては、該ケリーバ８は図１のこじり支点距離Ｌ_Ｔ の長さを有して上下２個所に支持点を有することになり、依って、補助作業時にブーム４を旋回又は起伏動作を為すことによって生じるケリーバ８のこじれが防止され、該ケリーバ８の上下動に支障を来すことは回避される。即ち、図１に示すこじり支点距離Ｌ_Ｔ の長さは図１１に示すＬ_Ｔ の長さより大に形成することが可能となり、ｆａ及びｆｂの力を小さくして該ケリーバ８の円滑なる上下動を可能ならしめているのである。
【００２７】
次に、掘削孔１８の掘削作業時に於いては、前記補助作業選択スイッチ２９をオフすることにより前記電磁切換弁３０はＢ位置に切換って前記シリンダ２６内の圧油はタンク３１内に環流し、そして、前記戻しバネ２７にて前記ガイドアーム２３，２３を後方（図１に於いて鎖線方向）へ回動させてケリーバガイド２１をケリーバ８より退避させ、格納位置に格納する。斯くして、掘削作業時に於いてはケリーバ８の回転上下動が円滑に行われ、依って、掘削作業も円滑に実施される。
【００２８】
尚、図４に於いて、前記掘削作業時にはアクチュエータ（図示せず）の油圧シリンダ３３にタンク３１内の圧油が電磁切換弁３０ａを介して供給され、又はタンク３１内へ環流させて該掘削作業が実施されることは当然である。
【００２９】
次に、本発明の他の実施の形態を図５及び図６に従って説明する。同図に於いて、前記図２乃至図４に示すケリーバガイド２１、ガイドアーム２３，２３及びシリンダ２６並びに戻しバネ２７に対応する夫々のケリーバガイド２１ａ、ガイドアーム２３ａ，２３ａ及びシリンダ２６ａ並びに戻しバネ２７ａの配置を横方向へ配置して全高を低く形成している。
【００３０】
即ち、前記ガイドアーム２３ａ，２３ａは略く字形に形成されて支持フレーム１２上面に左右対象に配設され、そして、折曲部を回動支点とし、左右回動自在に形成してある。同図に於いては、上方のガイドアーム２３ａの右端部に戻しバネ２７ａが取り付けられ、そして、該戻しバネ２７ａの他端部を支持フレーム１２上面に止着して該戻しバネ２７ａを水平方向に配設して前記ガイドアーム２３ａを同図に於いて鎖線方向へ回動させるように付勢している。即ち、前記シリンダ２６内から圧油が抜かれたとき、該戻しバネ２７ａの付勢力が作用してケリーバガイド２１ａを鎖線位置即ち、格納位置に回動させて格納できるように構成されている。
【００３１】
又、前記シリンダ２６ａは同図に於いて、支持フレーム１２上に水平に配設され、そして、下方のガイドアーム２３ａの右端部にシリンダロッド２６ｂを連結してある。前記ケリーバガイド２１ａは之等双方のガイドアーム２３ａの他端部即ち、同図に於いて左端部に軸２５ａを介して枢着されている。而して、補助作業時に於いては該シリンダ２６ａ内へ圧油が供給され、そして、シリンダロッド２６ｂが突出して双方のガイドアーム２３ａ，２３ａを同図実線で示す方向へ回動させ、該ガイドアーム２３ａ，２３ａに枢着されている前記ケリーバガイド２１ａをケリーバ８に当接させることにより、前述した図２乃至図４に示す装置と全く同一の作用を為すことができる。
【００３２】
斯くの如く、本発明は掘削作業時に於いてはケリーバガイド２１，２１ａは格納されるため、ストッパ８ａの地上高及び掘削深さは、図８に示した従来例と同様にストッパ８ａの地上高並びに掘削深さを適正に確保することができ、効果的な掘削作業が実施される。更に又、補助作業時にはケリーバガイド２１，２１ａがケリーバ８に当接し、ケリーバ８のこじり支点距離Ｌ_Ｔ を大きく取ってｆａ，ｆｂの力を可及的に小にすることにより、ケリーバ８の円滑なる動作ができるように構成されている。更に、図１０に示す支持フレーム１２に延設部１２ａを設け、該延設部１２ａ上端部に上部ガイド２０を設けた杭打機に対し、ケリーバガイド２１，２１ａは小型軽量に製作することが可能となるため、図１０に示す杭打機の有する問題点はすべて解消することが可能となった。
【００３３】
尚、本発明は杭打機のアースドリル工法に用いる施工機について説明したが、三点支持杭打機のオーガのガイドや、移動式クレーンをベースとした懸垂リーダの銅板矢板ガイドにも適用される。その他、本発明は、本発明の精神を逸脱しない限り種々の改変を為すことができ、そして、本発明が該改変されたものに及ぶことは当然である。
【００３４】
【発明の効果】
本発明は上記実施の形態にて詳述したように、支持フレームの上方部位にケリーバガイドを前後回動自在に設け、補助作業時にはキャビン内に設置されている補助作業選択スイッチをオンして該ケリーバガイドをケリーバに当接させることによりケリーバのこじり支点距離を長く形成し、ケリーバの円滑なる上下動を可能にした。更に、掘削作業時には該ケリーバガイドを格納するため、該ケリーバのストッパの地上高を低い位置に確保して掘削深さを大きくとることにより、効果的な掘削作業が実施される。更に、支持フレームに延設部を設け、該延設部上端部に上部ガイドを設けたのに比し、軽量小型に形成して機体が不慮倒回するようなことは一切回避することができる等、正に著大なる効果を奏する発明である。
【図面の簡単な説明】
【図１】本発明の一実施の形態であって、補助作業時の状態を示す解説側面図。
【図２】本発明の要部を示し、ケリーバガイド部分の平面図。
【図３】図２の側面図
【図４】図２の作動を示す解説図。
【図５】本発明の他の実施の形態を示し、ケリーバガイド部分の平面図。
【図６】図５の側面図。
【図７】従来例の杭打機の側面図。
【図８】従来例の掘削作業の状態を示す側面図。
【図９】従来例の補助作業時を示す側面図。
【図１０】従来例の他の実施の形態を示し、補助作業時の解説側面図。
【図１１】補助作業時におけるケリーバの上下動の条件を説明した解説図。
【符号の説明】
１ 杭打機
２ 下部走行体
３ 上部旋回体
４ ブーム
５ ブーム起伏シリンダ
６ ウインチ
７ ケリーバ吊りロープ
８ ケリーバ
８ａ ストッパ
９ 掘削バケット
１０ 回転駆動装置
１１ 支持ロープ
１２ 支持フレーム
１３ 起伏シリンダ
１４ フロントフレーム
１６ キャビン
１８ 掘削孔
１９ 鉄筋
２１，２１ａ ケリーバガイド
２２ ブラケット
２３，２３ａ ガイドアーム
２４ 軸片
２５ 軸
２６，２６ａ シリンダ
２６ｂ シリンダロッド
２７ 戻しバネ
２９ 補助作業選択スイッチ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a kelly bar guide device of a pile driver, particularly, when the excavation operation by the pile driver is completed, when performing a hanging operation of a reinforcing bar or the like in an excavation hole, the device is drawn to the boom side and stopped. The present invention relates to a kelly bar guide device of a pile driver in which a kelly bar does not get caught at a support portion of a rotary drive device.
[0002]
Problems to be solved by the prior art and the invention
A conventional pile driver of this type will be described with reference to FIGS. In the figure, 1 indicates a pile driver. In the pile driving machine 1, an upper swing body 3 is swingably mounted on a lower traveling body 2, and a boom 4 is mounted on the upper swing body 3 so that the boom 4 can be freely raised and lowered by expansion and contraction of a boom lifting cylinder 5. Further, a kelly bar hanging rope 7 is drawn out from a winch 6 provided on the upper swing body 3 and wrapped around the top of the boom 4. A kelly bar 8 is connected to the kelly bar hanging rope 7 and hung on the boom 4. Further, a rotary drive device 10 for rotating and driving the kelly bar 8 and a digging bucket 9 attached to a lower end portion of the kelly bar 8 is suspended from the boom 4 by a support rope 11. Further, the rotary drive device 10 is supported at a lower part of a support frame 12, and the support frame 12 is pivotally attached to a front portion of the upper revolving unit 3 by an up / down cylinder 13 so as to be able to move up and down. Are integrally fixed to the upper end of the main body. Accordingly, the support frame 12 is configured to be able to move back and forth by the expansion and contraction operation of the up-and-down cylinder 13, and the rotary drive device 10 drives the kelly bar 8 to rotate as described above, and is fitted to be able to move up and down. ing.
[0003]
In the drawing, reference numeral 15 denotes an auxiliary work hook, and 16 denotes a cabin provided on the upper swing body.
[0004]
FIG. 8 shows a state in which an excavation hole 18 has been excavated in the ground 17 using the pile driver 1. In the figure, the kelly bar hanging rope 7 wound around the winch 6 is unwound, the kelly bar 8 and the excavating bucket 9 attached to the tip of the kelly bar 8 are lowered, and the rotation drive is performed. The drilling hole 18 is drilled while the kerry bar 8 and the drilling bucket 9 are rotated down by the drive of the apparatus 10.
[0005]
In order to increase the depth of the excavation hole 18, it is conceivable to use a long kelly bar 8. However, a stopper provided at the upper end of the kelly bar 8 determined by the position of the rotary driving device 10 is considered. The ground clearance of 8a must be made as low as possible. However, if the ground height of the stopper 8a provided on the kelly bar 8 is extremely low, the earth and sand discharge height required for the operation of discharging the earth and sand in the excavation bucket 9 to the ground as shown in FIG. As a result, it becomes difficult to discharge the earth and sand.
[0006]
Further, when the excavation work of the excavation hole 18 by the pile driver 1 is completed as described above, a reinforcing bar 19 or concrete for constructing a foundation pile is suspended in the excavation hole 18. This is done as an auxiliary task.
[0007]
In carrying out the assisting operation, the kelly bar hanging rope 7 is wound up to pull the kelly bar 8 upward, and in this state, the kelly bar 8 is pulled toward the boom 4 via the up / down cylinder 13. In this state, the keriba 8 is stopped, and the auxiliary work is performed in this state. At this time, the larger the allowable load that can lift the rebar or concrete or the like by the pile driver 1 is, the better the work efficiency is and the more stable the work is.
[0008]
Thus, the upward movement of the kelly bar 8 is performed by winding up the hanging rope 7 with the winch 6, and the downward movement is performed by unwinding the hanging rope 7 and descending by its own weight. Is configured.
[0009]
Therefore, in order for the kerry bar 8 to move up and down smoothly in the inclined state, the expression μ × (fa + fb) <Fs must be satisfied as shown in FIG. here,
μ: Friction coefficient fa: Force applied to the kerry bar 8 from the upper right side of the rotary drive 10 fb: Force applied to the keliver 8 from the lower left side of the rotary drive 10 Fs: Downward of the kelly bar 8 The kelly bar 8 cannot be moved up and down by being hooked on the rotary drive device 10 when μ × (fa + fb) ≧ Fs in FIG.
[0010]
In the same figure,

Holds. here,
O: center of gravity of Keriba 8 F _B: force F _H is loaded from the left side with respect to the lower end of the support frame _12: the force due to the hook L: the upper end portion of Keriba 8 and the lower end portion of the support frame 12 Distance L _D : Distance L between the center of gravity O of the kerry bar 8 and the lower end of the support frame 12 L _F : Distance L _T between the lower end of the rotary drive device 10 and the lower end of the kerry bar 8: Rotation drive device 10 Distance between upper and lower sides
From the above three equations,

And [0012]
(Equation 3)

Is obtained.
[0013]
Therefore, conventionally, as shown in FIG. 10, in order to smoothly move the kelly bar 8 up and down, the support frame 12 is extended upward, and an upper guide 20 is provided at the upper end of the extension 12a, and the fulcrum distance is increased. the L _T takes long and is formed small force of said fa and fb. In this case, smoothness of the vertical movement of the kelly bar 8 can be expected, but when the kelly bar 8 is lowered to excavate the excavation hole 18 as shown in FIG. Since the rotation is stopped by the rotation driving device 10, the height of the stopper 8a is higher than the height of the stopper 8a in the pile driving machine shown in FIG. Therefore, there is a defect that the depth of the drill hole 18 becomes shallow.
[0014]
Furthermore, since the present invention has the extending portion 12a and the upper guide 20 as compared with the pile driver 1 shown in FIGS. 7 to 9, the frame mass acts in a direction in which the pile driver 1 falls. Therefore, the load that can be lifted during the auxiliary work must be set small. Further, the entire mass of the pile driver 1 is also heavier by an amount corresponding to the extending portion 12a and the upper guide 20, and the mobility of the machine is lacking.
[0015]
When the kelly bar 8 is caught by the rotary drive device 10 and cannot be moved up and down, the operator stops the operation of the boom 4 and moves the support frame 12 by operating the up-and-down cylinder 13 to change the hooking state. The hook is disengaged by moving it back and forth while judging, and the kelever 8 can be moved up and down. This operation involves raising and lowering the boom 4 and suspending a suspended load such as the reinforcing bar 19. In addition to the turning operation of the upper rotating body 3 in the left and right directions at the time, as described above, the grasping of the hooking state of the keriba 8 and the like lead to the operator extreme mental fatigue and insufficient attention, and the work is performed. May be in danger.
[0016]
Further, in the method shown in FIG. 10, the operator does not need to worry about the hooking condition of the keriba 8 so that the operation can be performed safely. However, as described above, there is a danger that the pile driver will fall down. However, since the operator has different attention from the above-mentioned attention or the excavation depth becomes shallower, the use restriction such as the necessity of a long kelly bar 8 is additionally provided.
[0017]
Therefore, when the excavation work by the pile driver is completed and the auxiliary work for hanging the reinforcing bar or the like in the excavation hole is prevented, the kelly bar is prevented from being caught on the rotary drive device, and excavation is performed without adding the mass of the fuselage. There are technical issues that need to be solved in order to obtain a kelly bar guide device for a pile driver that maintains the depth of the hole sufficiently and secures the height of discharge of earth and sand so as not to hinder the excavation work. Therefore, the present invention aims to solve the problem.
[0018]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above object, and a boom or jib is mounted on a machine body so as to be able to be raised and lowered, is extended from a winch, and is suspended through a top of the boom or jib. A kelly bar is suspended from a kelly bar hanging rope, and a rotary driving device that rotatably drives an excavation bucket or the like attached to a lower end portion of the kelly bar and that fits the kelly bar so as to be vertically movable. In the pile driver supported at the lower part of the pile, a kelly bar guide is disposed at the upper end of the support frame so as to be pivotable back and forth. When performing the hanging operation, pull the kelly bar toward the boom or jib to stop the kelly bar, rotate the kelly bar guide toward the kelly bar side, and bring the kelly bar guide into contact with the kelly bar. Thus, the kelly bar guide device of a pile driver, characterized in that the kelly bar is configured to be able to move up and down smoothly by preventing the kelly bar from being twisted, and the kelly bar guide is mounted on a switch provided in the cabin. The present invention provides a kelly bar guide device for a pile driver, which is configured to perform a front-rear rotation operation.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The same reference numerals are given to the same portions as those in the conventional example, and the description thereof will be omitted.
[0020]
In FIG. 1, a rotary drive for rotating the kelly bar 8 and a drilling bucket attached to the lower end of the kelly bar 8 and fitting the kelly bar 8 so as to allow the kelly bar 8 to move up and down. The device 10 is supported at a lower portion of the support frame 12 as described in the conventional example, and furthermore, the support frame 12 is provided with an up-and-down cylinder 13 provided at a front portion of the upper rotating body 3. It is fixed to the upper end of the front frame 14 that rotates back and forth by the expansion and contraction operation. However, it is natural that the support frame 12 is fixed to the front frame 14 in such a position that the support frame 12 is kept substantially parallel to the kelly bar 8.
[0021]
In the present invention, a kelly bar guide 21 is attached to the upper end of the support frame 12 so as to be able to rotate back and forth. As shown in FIGS. 2 to 4, the kelly bar guide 21 is provided with brackets 22, 22 projecting from the upper surface of the support frame 12 on the left and right sides, and facing the inner surfaces of the upper ends of the brackets 22, left and right. The guide arms 23 are fixed to the shaft pieces 24, and the shaft pieces 24 are pivotally attached to the brackets 22. 23, 23 are configured to be rotatable back and forth with respect to the brackets 22, 22. Further, the roller-like kelly bar guide 21 is rotatably provided on a shaft 25 at the distal ends of the guide arms 23.
[0022]
Further, a cylinder 26 and a return spring 27 are disposed between the shaft piece 24 and the support frame 12. When the cylinder 26 performs auxiliary work, it supplies pressure oil to the cylinder 26 to extend the cylinder 26, and this operation causes the guide arms 23, 23 to rotate forward to rotate the roller-shaped kelly bar guide 21. Abuts on Keliva 8.
[0023]
Therefore, the kelly bar 8 is supported by both the rotary driving device 10 and the kelly bar guide 21. In this way, the kerry bar 8 is twisted when the boom 4 is turned or undulated during the auxiliary work, and the kerry bar 8 does not get caught on the rotary drive device 10. Also, at the time of excavation work of the excavation hole 18, the pressurized oil to the cylinder 26 is circulated into the tank, and the guide arms 23, 23 are pulled back to the opposite side by the return spring 27, and the kelly bar guide 21 is moved. Evacuate Keriva 8 Thus, at the time of excavation work, the kelly bar 8 moves up and down smoothly, and the excavation work of the excavation hole 18 is performed.
[0024]
Also, by using a cylinder 26 that is freely expandable and contractible, the return spring 27 can be omitted.
[0025]
In the illustrated example, the tip of the cylinder rod 26b of the cylinder 26 is pivotally attached to the tip of an operating arm 28 fixed to the shaft piece 24, and the cylinder 26 is driven via the operating arm 28. Although it is configured to transmit to the guide arms 23, 23, it is not limited thereto.
[0026]
The operation of the cylinder 26 and the return spring 27 will be described with reference to FIG. In the figure, an auxiliary work selection switch 29 is provided in the cabin 16. Then, when the operator turns on the auxiliary work selection switch 29 in the cabin 16, the electromagnetic switching valve 30 is switched to the position A, and the hydraulic oil in the tank 31 is supplied into the cylinder 26 by the hydraulic pump 32. Then, the cylinder rod 26b of the cylinder 26 is protruded to rotate the kelly bar guide 21 toward the kelly bar 8 (in the direction of the solid line in FIG. 1), and the kelly bar guide 21 is brought into contact with the kelly bar 8. Thus to and at the time of auxiliary operations, the Keriba 8 will have a supporting point on the upper and lower positions have a length of 1 Nokojiri fulcrum distance L _T, depending, boom 4 at the auxiliary working The kelly bar 8 is prevented from being twisted due to turning or raising and lowering the shaft, and obstruction of the up and down movement of the kerry bar 8 is avoided. That is, the length of the fulcrum distance L _T prying shown in Figure 1 makes it possible to form a larger than the length of L _T shown in FIG. 11, smooth Naru vertical movement of the Keriba 8 to reduce the force of fa and fb Is made possible.
[0027]
Next, at the time of excavating the excavation hole 18, by turning off the auxiliary operation selecting switch 29, the electromagnetic switching valve 30 is switched to the position B, and the pressure oil in the cylinder 26 returns to the tank 31. Then, the guide arms 23, 23 are rotated rearward (in the dashed line direction in FIG. 1) by the return spring 27 to retract the kelly bar guide 21 from the kelly bar 8 and store it in the storage position. Thus, during the excavation work, the rotary up and down movement of the kelly bar 8 is smoothly performed, and accordingly, the excavation work is also smoothly performed.
[0028]
In FIG. 4, during the excavation operation, the hydraulic oil in the tank 31 is supplied to the hydraulic cylinder 33 of the actuator (not shown) via the electromagnetic switching valve 30a, or the oil is returned into the tank 31 and returned to the excavation work. It is natural that the work is performed.
[0029]
Next, another embodiment of the present invention will be described with reference to FIGS. 2, the kelly bar guide 21, the guide arms 23, 23 and the cylinder 26 and the return spring 27 corresponding to the kelly bar guide 21, the guide arms 23a, 23a, the cylinder 26a and the return spring shown in FIGS. The arrangement of 27a is arranged in the horizontal direction to reduce the overall height.
[0030]
That is, the guide arms 23a, 23a are formed in a substantially rectangular shape, are disposed symmetrically on the upper surface of the support frame 12, and are formed to be rotatable left and right with the bent portion as a rotation fulcrum. In the same drawing, a return spring 27a is attached to the right end of the upper guide arm 23a, and the other end of the return spring 27a is fixed to the upper surface of the support frame 12 to move the return spring 27a in the horizontal direction. And urges the guide arm 23a to rotate in the direction of the dashed line in FIG. That is, when the pressure oil is drained from the inside of the cylinder 26, the urging force of the return spring 27a acts to rotate the kelly bar guide 21a to the chain line position, that is, the storage position, so that the kelly bar guide 21a can be stored.
[0031]
The cylinder 26a is horizontally arranged on the support frame 12 in the same figure, and a cylinder rod 26b is connected to the right end of the lower guide arm 23a. The kelly bar guide 21a is pivotally connected to the other end of the two guide arms 23a, that is, to the left end in FIG. At the time of auxiliary work, pressurized oil is supplied into the cylinder 26a, and the cylinder rod 26b projects to rotate both guide arms 23a, 23a in the direction shown by the solid line in FIG. By bringing the kelly bar guide 21a pivotally attached to the arms 23a, 23a into contact with the kelly bar 8, the same operation as that of the apparatus shown in FIGS. 2 to 4 can be performed.
[0032]
As described above, in the present invention, the kelly bar guides 21 and 21a are stored during the excavation work, so that the ground height and the excavation depth of the stopper 8a are the same as the conventional example shown in FIG. In addition, the excavation depth can be appropriately secured, and effective excavation work is performed. Furthermore, Keriba guide 21,21a during auxiliary working abuts the Keriba 8, Keriba 8 Nokojiri fulcrum distance L _T largely taken fa, by the small as possible the power of fb, smooth the Keriba 8 It is configured to perform the following operations. Further, the kelly bar guides 21 and 21a can be manufactured to be small and light in comparison with a pile driving machine in which the extension portion 12a is provided on the support frame 12 shown in FIG. 10 and the upper guide 20 is provided at the upper end of the extension portion 12a. As a result, all the problems of the pile driver shown in FIG. 10 can be solved.
[0033]
Although the present invention has been described with respect to the construction machine used for the earth drill method of a pile driver, the invention is also applied to an auger guide of a three-point support pile driver and a copper sheet pile guide of a suspension leader based on a mobile crane. You. In addition, the present invention can be variously modified without departing from the spirit of the present invention, and it is natural that the present invention extends to the modified ones.
[0034]
【The invention's effect】
As described in detail in the above embodiment, the present invention provides a kelly bar guide at an upper portion of the support frame so as to be rotatable back and forth, and turns on an auxiliary work selection switch provided in the cabin during the auxiliary work. The kelever guide is brought into contact with the kelly bar, thereby increasing the distance between the fulcrum and the fulcrum, thereby enabling the kelly bar to move up and down smoothly. Further, during the excavation operation, an effective excavation operation is carried out by securing the stopper of the kerry bar at a low position and increasing the excavation depth in order to store the kelly bar guide. Further, as compared with the case where the extension portion is provided on the support frame and the upper guide is provided at the upper end portion of the extension portion, it is possible to avoid the accidental turning of the body at all by forming a small and light weight. It is an invention which has a very great effect.
[Brief description of the drawings]
FIG. 1 is an explanatory side view showing a state at the time of an auxiliary work according to an embodiment of the present invention.
FIG. 2 is a plan view showing a main part of the present invention and showing a kelly bar guide portion.
FIG. 3 is a side view of FIG. 2; FIG. 4 is an explanatory view showing the operation of FIG. 2;
FIG. 5 shows another embodiment of the present invention and is a plan view of a kelly bar guide portion.
FIG. 6 is a side view of FIG. 5;
FIG. 7 is a side view of a conventional pile driver.
FIG. 8 is a side view showing a state of a conventional excavation operation.
FIG. 9 is a side view showing a conventional example at the time of auxiliary work.
FIG. 10 shows another embodiment of the conventional example, and is a side view for explanation at the time of auxiliary work.
FIG. 11 is an explanatory diagram illustrating conditions for up-and-down movement of the keriba during an auxiliary operation.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pile driver 2 Lower traveling body 3 Upper revolving superstructure 4 Boom 5 Boom raising / lowering cylinder 6 Winch 7 Kelly bar hanging rope 8 Kelly bar 8a Stopper 9 Excavation bucket 10 Rotary drive device 11 Support rope 12 Support frame 13 Up / down cylinder 14 Front frame 16 Cabin 18 Drilling hole 19 Reinforcing bar 21, 21a Kelly bar guide 22 Bracket 23, 23a Guide arm 24 Shaft piece 25 Shaft 26, 26a Cylinder 26b Cylinder rod 27 Return spring 29 Auxiliary work selection switch

Claims (2)

A boom or jib is attached to the machine body so as to be able to move up and down, is extended from a winch, and is suspended from a kellyba hanging rope suspended from the top of the boom or jib, while a lower end of the kellyba is suspended. In a pile driving machine in which a rotary driving device for rotatably driving an excavating bucket or the like attached to a portion and vertically fitting the kelly bar is supported at a lower portion of a support frame, A kelly bar guide is arranged at the upper end of the frame so as to be able to rotate back and forth. By rotating the Keriba guide to the Keriba side and bringing the Keriba guide into contact with the Keriba, the Keriba is prevented from twisting and the Keriba is smoothly moved up and down. Keriba guide device of pile driver, characterized in that it is configured to. 2. The kelly bar guide device for a pile driver according to claim 1, wherein the kelly bar guide is configured to perform a forward / backward rotation operation by a switch provided in the cabin.

Images