JP2012001920A - Fall prevention device for steady brace of excavation shaft - Google Patents

Fall prevention device for steady brace of excavation shaft Download PDF

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JP2012001920A
JP2012001920A JP2010135917A JP2010135917A JP2012001920A JP 2012001920 A JP2012001920 A JP 2012001920A JP 2010135917 A JP2010135917 A JP 2010135917A JP 2010135917 A JP2010135917 A JP 2010135917A JP 2012001920 A JP2012001920 A JP 2012001920A
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wire
steady rest
operating bar
support piece
operation bar
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JP5134649B2 (en
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Jiro Enomoto
二郎 榎本
Junichi Shimizu
純一 清水
Yasunari Nakasone
康徳 仲宗根
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SEIKO TONE CO Ltd
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SEIKO TONE CO Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device for a steady brace of an excavation shaft having no excessive force on an operating bar and a horizontal shaft during a lifting operation after exchanging wires and capable of detaching the operating bar from a support piece without high resistance.SOLUTION: A fall prevention device 8 comprises: a support piece 9; an operating bar 11; a spring member 12; a wire attachment part 13 provided at an upper end of the operating bar 11; and a rotation inhibition part 14 capable of inhibiting further rotation with the operating bar 11 tilting when the operating bar 11 is rotated by a spring force. As the steady brace 5 becomes standing posture against the spring force when the steady brace 5 is suspended by a wire 4, the steady brace 5 can move vertically while the operating bar 11 is prevented from being brought into contact with the support piece 9. When the wire 4 is cut or loosened, the operating bar 11 is rotated by the spring force until further rotation is inhibited by the rotation inhibition part 14 and the tilted posture of the operating bar 11 is held, and, in this state, a lower end of the operating bar 11 held in the tilted posture comes in contact with the upper part of the support piece 9, which prevents the steady brace 5 from falling.

Description

本発明は、掘削軸の振れ止めの落下防止装置に関するものである。   The present invention relates to a fall prevention device for excavation shaft steadying.

従来から、リーダに上下移動自在に取付けた昇降装置に掘削軸の上端部を取付けて掘削軸により地盤を掘削する掘削機において、上記掘削軸の周囲を囲んで掘削軸の横振れを規制する振れ止めをリーダに取付けるようにしている。この振れ止めは、リーダにワイヤで吊下げてリーダに対して上下移動自在に取付けてある。しかし、ワイヤが切れたり、弛んだりすると、振れ止めが落下して危険である。そこで、ワイヤが切断又は弛んだ際に振れ止めの落下を防止する落下防止装置を備えることが、特許文献１、特許文献２により知られている。   Conventionally, in an excavator that excavates the ground with an excavation shaft by attaching the upper end of the excavation shaft to an elevating device that is attached to the leader so as to be movable up and down, the runout that surrounds the excavation shaft and regulates the lateral deflection of the excavation shaft A stop is attached to the reader. The steady rest is attached to the leader with a wire so as to be movable up and down with respect to the leader. However, if the wire breaks or loosens, the steady rest falls and is dangerous. Therefore, it is known from Patent Document 1 and Patent Document 2 to include a fall prevention device that prevents the steady rest from dropping when the wire is cut or slackened.

上記特許文献１に示される従来例は、図９の説明図に示すように、振れ止め５に横軸１０で回動自在に取付けた作動バー１１を、チェーン３０、スプロケット３１、昇降部材３２を介してワイヤ４で吊下げることで、振れ止め５を昇降自在に吊下げてある。   As shown in the explanatory diagram of FIG. 9, the conventional example disclosed in Patent Document 1 includes an operation bar 11 that is rotatably attached to a steady rest 5 by a horizontal shaft 10, a chain 30, a sprocket 31, and a lifting member 32. Through the suspension with the wire 4, the steady rest 5 is suspended so as to be movable up and down.

そして、ワイヤ４が切断又は弛んだ場合、ばね材１２のばね力で作動バー１１が回動し、作動バー１１の下半部がリーダ２側に突出するが、該下半部が水平姿勢となると作動バー１１の上部が回動阻止部に当たって作動バー１１のそれ以上の回動を阻止し、水平姿勢を保持し、この作動バー１１の下半部が水平姿勢に保持された状態で、リーダ２に設けた支持片９に当接して振れ止め５の落下を防止するようになっている。   When the wire 4 is cut or slackened, the operating bar 11 is rotated by the spring force of the spring material 12, and the lower half of the operating bar 11 protrudes toward the reader 2, but the lower half is in a horizontal posture. Then, the upper part of the operating bar 11 hits the rotation preventing part to prevent further rotation of the operating bar 11 to maintain the horizontal posture, and the leader of the lower half of the operating bar 11 is held in the horizontal posture. 2 to prevent the steady rest 5 from falling.

特開２００１−３３６１号公報JP 2001-3361 A 実公平５−４０１０７号公報No. 5-40107

ところが、この特許文献１に示された従来例にあっては、図９に示すような、作動バー１１の下半部が水平姿勢で支持片９に当接して振れ止め５の落下を防止している状態から、作動バー１１を起立姿勢にして、振れ止め５を再びワイヤ４で吊下げるには、切断したワイヤ４を交換して図１０の矢印イ方向に引き上げたり、あるいは、弛んだワイヤ４を図１０の矢印イ方向に引き上げる必要がある。   However, in the conventional example shown in Patent Document 1, as shown in FIG. 9, the lower half of the operating bar 11 contacts the support piece 9 in a horizontal posture to prevent the steady rest 5 from falling. In order to raise the operation bar 11 from the standing state and suspend the steady rest 5 with the wire 4 again, the cut wire 4 can be replaced and pulled up in the direction of arrow A in FIG. 4 needs to be pulled up in the direction of arrow A in FIG.

この場合、図１０の矢印イ方向にワイヤ４を引き上げても水平姿勢で支持片９の上面に当たっている作動バー１１が、水平姿勢のままいきなり支持片９上面から離れることはなく、水平姿勢の作動バー１１の横軸１０の上方への移動に伴い、作動バー１１が横軸１０を中心に回動し、作動バー１１の先端（下端）が、支持片９上面を強く擦りながら図１０のａ位置から図１０のｂ位置まで移動し、作動バー１１の先端（下端）がｂ位置を通過することで、支持片９から離れて起立姿勢となる。   In this case, even if the wire 4 is pulled up in the direction of the arrow A in FIG. 10, the operation bar 11 that is in contact with the upper surface of the support piece 9 in the horizontal posture remains in the horizontal posture and does not move away from the upper surface of the support piece 9. As the bar 11 moves above the horizontal axis 10, the operating bar 11 rotates about the horizontal axis 10, and the tip (lower end) of the operating bar 11 strongly rubs the upper surface of the support piece 9 as shown in FIG. It moves from the position to the position b in FIG. 10, and the tip (lower end) of the operating bar 11 passes the position b, so that it is in a standing posture away from the support piece 9.

ここで、横軸１０を中心に回動しながら水平姿勢の作動バー１１を起立させて、支持片９から脱離する際、振れ止め５の全荷重が作動バー１１の先端（下端）から支持片９上面に集中してかかっている状態で、横軸１０を中心に回動しながら作動バー１１の先端（下端）が支持片９上面を図１０のａ位置からｂ位置まで強く擦るように移動することになり、このため作動バー１１、あるいは横軸１０に無理な力が作用して損傷し易いという問題がある。   Here, when the operation bar 11 in a horizontal posture is erected while rotating about the horizontal axis 10 and is detached from the support piece 9, the entire load of the steady rest 5 is supported from the tip (lower end) of the operation bar 11. The tip (lower end) of the actuating bar 11 rubs the upper surface of the support piece 9 from the position a to the position b in FIG. 10 while turning around the horizontal axis 10 while being concentrated on the upper surface of the piece 9. Therefore, there is a problem that an excessive force acts on the operating bar 11 or the horizontal shaft 10 and is easily damaged.

しかも、上記のように、振れ止め５の全荷重が作動バー１１の先端（下端）から支持片９上面に集中してかかった状態で、作動バー１１が水平姿勢から起立姿勢になるまで、横軸１０を中心に回動しながら作動バー１１の先端（下端）が支持片９上面を図１０のａ位置からのｂ位置まで擦るようにして移動するため、この間ずっと図１１（ｂ）の矢印ロに示すように振れ止め５をリーダ２から離れる方向に移動させようとする水平力が作用し、ガイド部６がガイドレール７に強く当たって上方に移動する際の強い抵抗となり、このため、ａ位置からｂ位置まで摺動する際におけるワイヤ４による引き上げ作業の障害となるという問題があった。   In addition, as described above, in a state where the entire load of the steady rest 5 is concentrated on the upper surface of the support piece 9 from the tip (lower end) of the operation bar 11, the horizontal movement is continued until the operation bar 11 changes from the horizontal posture to the standing posture. Since the tip (lower end) of the operating bar 11 moves while rubbing from the position a to the position b in FIG. 10 while rotating about the shaft 10, the arrow in FIG. As shown in (b), a horizontal force is applied to move the steady rest 5 in the direction away from the reader 2, and the guide portion 6 strongly hits the guide rail 7 and becomes a strong resistance when moving upward. There has been a problem that it becomes an obstacle to the pulling work by the wire 4 when sliding from the a position to the b position.

また、特許文献２に示された従来例も、上記と同様、作動バー１１の下半部が水平姿勢に保持された状態で、リーダ２に設けた支持片９に当接して振れ止め５の落下を防止するようになっており、上記と同様の問題が生じる。   Similarly to the above, the conventional example shown in Patent Document 2 is also in contact with the support piece 9 provided on the reader 2 in a state where the lower half portion of the operation bar 11 is held in a horizontal posture. The fall is prevented, and the same problem as described above occurs.

本発明は、上記の従来例の問題点に鑑みて発明したものであって、作動バーが支持片に当たって振れ止めの落下を防止した状態で、ワイヤを交換して引き上げ作業を行う際に、作動バーや横軸に無理な力が作用することがなく、また、大きな抵抗無く作動バーを支持片から脱離させてスムーズに吊り上げることができる掘削軸の振れ止めの落下防止装置を提供するにある。   The present invention was invented in view of the problems of the conventional example described above, and is operated when the wire is exchanged and the pulling work is performed in a state where the operation bar hits the support piece and prevents the steady rest from falling. To provide an anti-falling device for preventing the steadying of an excavating shaft, in which an excessive force is not applied to the bar and the horizontal axis, and the operating bar can be lifted smoothly by detaching the operating bar from the support piece without great resistance. .

本発明の掘削軸の振れ止めの落下防止装置は、回転装置１を上下移動自在に取付けたリーダ２と、回転装置１に取付けられて回転駆動する掘削軸３と、ワイヤ４により吊下げられて上記掘削軸３の周囲を囲んで掘削軸３の横振れを規制するための筒状の振れ止め５と、振れ止め５に設けたガイド部６と、ガイド部６が上下移動自在に嵌め込まれるリーダ２に設けたガイドレール７と、ワイヤ４が切断又は弛んだ際に振れ止め５の落下を防止する落下防止装置８とを備えている。上記落下防止装置８は、リーダ２に設けた支持片９と、振れ止め５に横軸１０で回動自在に取付けた作動バー１１と、横軸１０を中心に作動バー１１下部がリーダ２に近づく方向に回動するようにばね力を付与するばね材１２と、作動バー１１の上端部に設けた上記振れ止め５を吊下げる上記ワイヤ４を取付けるためのワイヤ取付け部１３と、ばね材１２のばね力で作動バー１１が回動した際に作動バー１１が斜めに傾斜した状態でそれ以上の回動を阻止する回動阻止部１４を備えている。そして、振れ止め５をワイヤ４で吊下げた際にばね材１２のばね力に抗して振れ止め５が起立姿勢となることで、作動バー１１が支持片９に当たることなく振れ止め５が上下移動可能に構成され、ワイヤ４が切断又は弛んだ際に、ばね材１２のばね力で作動バー１１が回動して回動阻止部１４で回動が阻止されて傾斜姿勢が保持された状態で、該傾斜姿勢に保持された作動バー１１の下端が支持片９上に当接して振れ止め５の落下を防止するようになっている。   The excavation shaft steadying prevention device according to the present invention is suspended by a reader 2 to which a rotating device 1 is mounted so as to be movable up and down, an excavating shaft 3 that is attached to the rotating device 1 and rotationally driven, and a wire 4. A cylindrical steady rest 5 that surrounds the excavation shaft 3 and regulates the lateral swing of the excavation shaft 3, a guide portion 6 provided on the steady stop 5, and a leader into which the guide portion 6 is fitted so as to be movable up and down. 2 and a fall prevention device 8 that prevents the steady rest 5 from falling when the wire 4 is cut or slackened. The fall prevention device 8 includes a support piece 9 provided on the reader 2, an operation bar 11 attached to the steady rest 5 so as to be rotatable about a horizontal axis 10, and a lower portion of the operation bar 11 around the horizontal axis 10 on the reader 2. A spring material 12 that applies a spring force so as to rotate in the approaching direction, a wire attachment portion 13 for attaching the wire 4 that suspends the steady rest 5 provided at the upper end portion of the operating bar 11, and a spring material 12 When the operation bar 11 is rotated by the spring force, a rotation blocking portion 14 is provided for preventing further rotation while the operation bar 11 is inclined obliquely. When the steady rest 5 is suspended by the wire 4, the steady rest 5 is in an upright posture against the spring force of the spring material 12, so that the steady rest 5 can be moved up and down without the operating bar 11 hitting the support piece 9. When the wire 4 is cut or slackened, the actuating bar 11 is rotated by the spring force of the spring material 12, and the rotation preventing portion 14 is prevented from rotating and the inclined posture is maintained. Thus, the lower end of the operating bar 11 held in the inclined posture abuts on the support piece 9 to prevent the steady rest 5 from falling.

このような構成とすることで、ワイヤ４が切断又は弛むと、作動バー１１がばね材１２で回動して回動阻止部１４で傾斜姿勢が保持された状態で回動が阻止され、この傾斜姿勢に保持された作動バー１１の下端が支持片９上に当接して振れ止め５の落下が防止される。この落下防止がなされた状態で、ワイヤ４を交換してワイヤ４を上方に引き上げる又は弛んだワイヤ４を引き上げることで、傾斜した作動バー１１が起立姿勢になるように引き上げて作動バー１１の下端を支持片９から離脱できる。この際、傾斜姿勢の作動バー１１を引き上げるので、傾斜姿勢の作動バー１１の下端部が支持片９上面からすぐ引き上げられて離れ、大きな抵抗を受けることなく作動バー１１を起立姿勢にできる。   With such a configuration, when the wire 4 is cut or loosened, the operation bar 11 is rotated by the spring material 12 and the rotation is prevented in the state where the tilting posture is held by the rotation blocking portion 14. The lower end of the operating bar 11 held in the inclined posture abuts on the support piece 9, and the steady rest 5 is prevented from falling. In a state in which the fall is prevented, the wire 4 is replaced and the wire 4 is pulled up or the slackened wire 4 is pulled up, so that the tilted working bar 11 is pulled up to be in a standing posture, and the lower end of the working bar 11 Can be detached from the support piece 9. At this time, since the tilted operation bar 11 is pulled up, the lower end portion of the tilted operation bar 11 is immediately lifted away from the upper surface of the support piece 9, so that the operation bar 11 can be in an upright position without receiving a large resistance.

本発明は、上記のようにワイヤが切断した際に、ばね材のばね力で作動バーが回動して回動阻止部で回動が阻止されて傾斜姿勢が保持された状態で、該傾斜姿勢に保持された作動バーの下端が支持片上に当接して振れ止めの落下を防止するように構成したので、落下防止がなされた状態で、ワイヤを交換してワイヤを上方に引き上げて作動バーの下端を支持片から離脱するに当たり、傾斜姿勢の作動バーの下端部が支持片上面から大きな抵抗なく直ぐに引き上げられることになり、この結果、作動バーや横軸に無理な力が作用しないようにして損傷を防止すると共に、大きな抵抗無く作動バーを支持片から脱離させてスムーズに吊り上げることができる。   In the present invention, when the wire is cut as described above, the operation bar is rotated by the spring force of the spring material, the rotation is prevented by the rotation preventing portion, and the inclined posture is maintained. Since the lower end of the operating bar held in the posture is in contact with the support piece to prevent the steady rest from dropping, the wire is exchanged and the wire is lifted upward while the fall is prevented. When the lower end of the support bar is detached from the support piece, the lower end part of the operation bar in the inclined posture is immediately pulled up from the upper surface of the support piece without great resistance, and as a result, an excessive force is not applied to the operation bar and the horizontal axis. In addition to preventing damage, the operating bar can be detached from the support piece and lifted smoothly without great resistance.

本発明の掘削軸の振れ止めの落下防止装置の側面図である。It is a side view of the fall prevention device of the steadying of the excavation shaft of the present invention. 図１のＸ−Ｘ線の拡大水平断面図である。It is an expanded horizontal sectional view of the XX line of FIG. 同上の拡大縦断面図である。It is an enlarged vertical sectional view same as the above. 同上に用いる落下防止装置本体を示し、（ａ）は正面図であり、（ｂ）は平面図であり、（ｃ）は側面図である。The fall prevention apparatus main body used for the same as above is shown, (a) is a front view, (b) is a plan view, and (c) is a side view. 同上のワイヤが切断して作動バーが支持片に当たって落下防止がなされた状態を示す側面図である。It is a side view which shows the state by which the wire same as the above was cut | disconnected, and the fall was prevented because the action | operation bar contacted the support piece. 図５のＹ−Ｙ線の拡大水平断面図である。FIG. 6 is an enlarged horizontal sectional view taken along line YY in FIG. 5. 同上の拡大断面図である。It is an expanded sectional view same as the above. 同上の全体側面図である。It is a whole side view same as the above. 従来例の落下防止がなされた状態の説明図である。It is explanatory drawing of the state by which fall prevention of the prior art example was made. 従来例の落下防止がなされた状態で、切断したワイヤを交換して上方に引き上げる際の作用説明図である。It is action explanatory drawing at the time of exchanging the cut wire and pulling it up in the state where fall prevention of a conventional example was made. （ａ）は従来例の水平断面図であり、（ｂ）は拡大水平断面図である。(A) is a horizontal sectional view of a conventional example, and (b) is an enlarged horizontal sectional view.

以下、本発明を添付図面に示す実施形態に基づいて説明する。   Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.

図８に示すように、クローラクレーンＡのリーダ２に回転装置１が上下移動自在に取付けてある。回転装置１には掘削軸３の上端部が着脱自在に取付けられ、回転装置１の昇降に伴って掘削軸３が回転駆動しながら昇降するようになっている。   As shown in FIG. 8, the rotating device 1 is attached to the leader 2 of the crawler crane A so as to be movable up and down. An upper end portion of the excavating shaft 3 is detachably attached to the rotating device 1, and the excavating shaft 3 moves up and down while being driven to rotate as the rotating device 1 moves up and down.

添付図面に示す実施形態においては、回転装置１が多軸回転装置であり、この多軸回転装置に複数本の掘削軸３を回転自在に取付けた例が示してある。   In the embodiment shown in the accompanying drawings, an example is shown in which the rotating device 1 is a multi-axis rotating device, and a plurality of excavating shafts 3 are rotatably attached to the multi-axis rotating device.

図８の実施形態では掘削軸３にスクリュー部２５、攪拌翼２６を設けた例が示してあるが、スクリュー部２５のみ、又は攪拌翼２６のみを設けたものであってもよい。   In the embodiment of FIG. 8, an example in which the screw portion 25 and the stirring blade 26 are provided on the excavation shaft 3 is shown, but only the screw portion 25 or only the stirring blade 26 may be provided.

リーダ２に、上記掘削軸３の周囲を囲んで掘削軸３の横振れを規制するための筒状の振れ止め５が上下移動自在に取付けてある。   A cylindrical steady rest 5 is attached to the leader 2 so as to be movable up and down so as to surround the excavation shaft 3 and to regulate the lateral deflection of the excavation shaft 3.

また、リーダ２には上下方向に長い一対のガイドレール７が設けてあり、リーダ２の上記一対のガイドレール７間に図２、図３に示すような支持片９が上下方向に複数設けてある。実施形態においては、ガイドレール７を補強するため、リーダ２にはあらかじめ一対のガイドレール７間を連結する補強板が上下方向に所定ピッチで設置してあり、このリーダ２にあらかじめ設置した補強板を支持片９として兼用している。もちろん、リーダ２に専用の支持片９を設けてもよい。   Further, the reader 2 is provided with a pair of guide rails 7 that are long in the vertical direction, and a plurality of support pieces 9 as shown in FIGS. 2 and 3 are provided between the pair of guide rails 7 of the reader 2 in the vertical direction. is there. In the embodiment, in order to reinforce the guide rail 7, a reinforcing plate that connects the pair of guide rails 7 in advance is installed in the leader 2 at a predetermined pitch in the vertical direction. Is also used as the support piece 9. Of course, the reader 2 may be provided with a dedicated support piece 9.

振れ止め５は、図１、図２に示すように、掘削軸３の周囲を囲む筒部１５と、筒部１５のリーダ２側の面に突設した突出部１６と、突出部１６のリーダ２側の面の両側に設けた一対の断面略Ｃ字状をしたガイド部６で主体を構成してある。   As shown in FIGS. 1 and 2, the steady rest 5 includes a cylindrical portion 15 surrounding the excavation shaft 3, a protruding portion 16 protruding from the surface of the cylindrical portion 15 on the reader 2 side, and a leader of the protruding portion 16. The main body is composed of a pair of guide portions 6 having a substantially C-shaped cross section provided on both sides of the two-side surface.

上記一対の断面略Ｃ字状のガイド部６は、一対のガイドレール７に上下移動自在に嵌め込んである。   The pair of guide portions 6 having a substantially C-shaped cross section are fitted to a pair of guide rails 7 so as to be movable up and down.

突出部１６のリーダ２側の面の中央部には落下防止装置本体８ａが取付けてある。そして、この振れ止め５に設ける落下防止装置本体８ａと、上記リーダ２に設ける支持片９とで落下防止装置８を構成している。   A fall prevention device main body 8a is attached to the center of the surface of the protrusion 16 on the reader 2 side. The fall prevention device body 8 a provided on the steady rest 5 and the support piece 9 provided on the reader 2 constitute a fall prevention device 8.

落下防止装置本体８ａは、図４に示すようなもので、取付け板１７の片面に突設した軸受け突部１８に作動バー１１の上部を横軸１０で回動自在に取付けると共に、横軸１０にスプリングよりなるばね材１２を巻装し、スプリングの一端部を作動バー１１に設けた係止ピン１９に弾性的に係止すると共にスプリングの他端部を取付け板１７に設けた受け部２０に弾接することで構成してある。   The fall prevention device main body 8 a is as shown in FIG. 4, and the upper portion of the operating bar 11 is rotatably attached to the bearing projection 18 projecting on one side of the mounting plate 17 by the horizontal shaft 10. A spring material 12 made of a spring is wound around the spring, and one end of the spring is elastically locked to a locking pin 19 provided on the operation bar 11 and the other end of the spring is provided on a mounting plate 17. It is made up of elastic contact.

ばね材１２は作動バー１１の下部が取付け板１７から離れる方向のばね力を作動バー１１に付与している。   The spring material 12 applies a spring force in the direction in which the lower portion of the operating bar 11 is separated from the mounting plate 17 to the operating bar 11.

ばね材１２のばね力で作動バー１１が回動した際に作動バー１１が斜めに傾斜した状態でそれ以上の回動を阻止する回動阻止部１４が取付け板１７に設けてある。図４（ｂ）に示す実施形態では、ばね材１２のばね力で作動バー１１が回動した際、作動バー１１が斜めに傾斜した状態で、作動バー１１の上端部が取付け板１７の外面に形成した回動阻止部１４に当たり、それ以上の回動が阻止されるように構成してある。   When the operating bar 11 is rotated by the spring force of the spring material 12, the mounting plate 17 is provided with a rotation preventing portion 14 that prevents further rotation while the operating bar 11 is inclined obliquely. In the embodiment shown in FIG. 4 (b), when the operating bar 11 is rotated by the spring force of the spring material 12, the upper end of the operating bar 11 is the outer surface of the mounting plate 17 with the operating bar 11 inclined obliquely. It hits against the rotation prevention part 14 formed in the above, and is configured to prevent further rotation.

作動バー１１の下端面は、上記のように回動阻止部１４によりそれ以上の回動が阻止された傾斜姿勢において水平となるように設定してあり、この作動バー１１の下端面が載置部２３となっている。   The lower end surface of the operation bar 11 is set to be horizontal in the inclined posture in which further rotation is prevented by the rotation prevention unit 14 as described above, and the lower end surface of the operation bar 11 is placed. It becomes part 23.

ここで、作動バー１１は垂直線に対する角度が略１０〜３０°、好ましくは略１５〜２０°の回動角度となった状態で回動阻止部１４によりそれ以上の回動が阻止されるように構成するのが好ましい。   Here, the operation bar 11 is prevented from being further rotated by the rotation preventing unit 14 in a state where the angle with respect to the vertical line is approximately 10 to 30 °, preferably approximately 15 to 20 °. It is preferable to configure.

また、作動バー１１の上端部にはワイヤ４を取付けるためのワイヤ取付け部１３を設けている。   Further, a wire attachment portion 13 for attaching the wire 4 is provided at the upper end portion of the operation bar 11.

図３のように、突出部１６のリーダ２側の面の中央部に取付け板１７をボルト等により取付けることで、上記の構成の落下防止装置本体８ａを振れ止め５に取付けるようになっている。   As shown in FIG. 3, the fall prevention device main body 8 a having the above-described configuration is attached to the steady rest 5 by attaching the attachment plate 17 to the center portion of the surface of the protrusion 16 on the reader 2 side with a bolt or the like. .

図８に示すように、作動バー１１の上端部に設けたワイヤ取付け部１３にはワイヤ４の端部が取付けられ、このワイヤ４はリーダ２の上端に設けたプーリー２１に介してクローラクレーンＡの巻取り装置２２に巻装してある。   As shown in FIG. 8, the end of the wire 4 is attached to the wire attaching portion 13 provided at the upper end of the operation bar 11, and the wire 4 is connected to the crawler crane A via a pulley 21 provided at the upper end of the leader 2. Is wound around the winding device 22.

巻取り装置２２でワイヤ４を巻き取ることで、ワイヤ４により振れ止め５を吊下げてリーダ２の上下方向の任意の高さ位置に吊下げるようにしている。   By winding the wire 4 with the winding device 22, the steady rest 5 is suspended by the wire 4 and suspended at an arbitrary height position in the vertical direction of the reader 2.

そして、このようにしてリーダ２に吊下げた振れ止め５の筒部１５に掘削軸３を挿通し、掘削軸３を昇降して、地盤３０に掘削孔を形成したり、ソイルセメント柱を形成したり、ソイルセメント壁を形成したり、杭体を形成したり、あるいは地盤改良を行う。   Then, the excavation shaft 3 is inserted into the cylindrical portion 15 of the steady rest 5 suspended from the leader 2 in this way, and the excavation shaft 3 is moved up and down to form an excavation hole in the ground 30 or a soil cement column. , Forming a soil cement wall, forming a pile, or improving the ground.

この場合、掘削軸３が振れ止め５の筒部１５で周囲を囲まれて横ずれが防止された状態で昇降するため、掘削が正確且つスムーズに行える。   In this case, since the excavation shaft 3 moves up and down in a state in which the excavation shaft 3 is surrounded by the cylindrical portion 15 of the steady rest 5 and the lateral displacement is prevented, excavation can be performed accurately and smoothly.

ところで、上記のように、ワイヤ４で振れ止め５をリーダ２に吊下げた状態では、図１、図３のように、ワイヤ取付け部１３を介して振れ止め５の全重量をワイヤ４で吊下げているため、ばね材１２のばね力に抗して作動バー１１が起立姿勢となる。この作動バー１１を吊下げた起立姿勢においては、横軸１０とその上方のワイヤ取付け部１３を結ぶ線が略垂直となる。   By the way, in the state where the steady rest 5 is suspended from the leader 2 by the wire 4 as described above, the entire weight of the steady rest 5 is suspended by the wire 4 via the wire attaching portion 13 as shown in FIGS. Since it is lowered, the actuating bar 11 is in a standing posture against the spring force of the spring material 12. In the standing posture in which the operation bar 11 is suspended, the line connecting the horizontal shaft 10 and the wire attaching portion 13 thereabove is substantially vertical.

この作動バー１１がワイヤ４で吊下げられて起立姿勢となった状態では、図３のように作動バー１１の下部がリーダ２側から離れて取付け板１７側に近づく。したがって、ワイヤ４で吊下げた状態では作動バー１１とリーダ２に設けた支持片９の先端との間には隙間が生じ、両者が干渉することなく、スムーズに上下昇降できるようになっている。   In a state where the operation bar 11 is suspended by the wire 4 and is in a standing posture, the lower portion of the operation bar 11 is separated from the reader 2 side and approaches the mounting plate 17 side as shown in FIG. Therefore, in the state suspended by the wire 4, a gap is generated between the operation bar 11 and the tip of the support piece 9 provided on the reader 2, so that the two can be smoothly moved up and down without interfering with each other. .

そして、ワイヤ４が何らかの理由で切断したり、弛んだ場合、ワイヤ４で振れ止め５の荷重を受けないため、振れ止め５が落下すると共に、作動バー１１がばね材１２のばね力で瞬時に回動して回動阻止部１４で傾斜姿勢が保持されたそれ以上の回動が阻止された状態となる。このように作動バー１１が傾斜姿勢を保持された状態では、作動バー１１の下端部の載置部２３が支持片９の先端を通る垂直線よりもリーダ２側に回動して位置する。   When the wire 4 is cut or slack for some reason, the wire 4 does not receive the load of the steady rest 5, so that the steady rest 5 falls and the operating bar 11 is instantaneously moved by the spring force of the spring material 12. It turns and it will be in the state from which the further rotation in which the inclination attitude | position was hold | maintained by the rotation prevention part 14 was blocked | prevented. Thus, in a state where the operation bar 11 is held in the inclined posture, the mounting portion 23 at the lower end of the operation bar 11 is rotated and positioned closer to the reader 2 than the vertical line passing through the tip of the support piece 9.

したがって、ワイヤ４が切断したり、弛んだりして振れ止め５が落下すると瞬時に上記のように作動バー１１が傾斜姿勢となるまで回動し、図５〜図７のように、作動バー１１の下端部の載置部２３が任意の支持片９の上面に載置され、振れ止め５の落下が防止されることになる。   Therefore, when the wire 4 is cut or loosened and the steady rest 5 falls, the operating bar 11 is instantaneously rotated as described above until the tilted posture is reached. As shown in FIGS. The mounting portion 23 at the lower end of the mounting portion is placed on the upper surface of an arbitrary support piece 9, and the steady rest 5 is prevented from falling.

上記のようにワイヤ４が切断したり、弛んだりした場合に、振れ止め５の落下防止がなされた状態で、ワイヤ４を交換してワイヤ４を上方に引き上げる（又は弛んだワイヤ４を引き上げる）ことで、傾斜した作動バー１１が起立姿勢になるように引き上げて作動バー１１の下端を支持片９から離脱できる。   When the wire 4 is cut or loosened as described above, the wire 4 is replaced and the wire 4 is pulled upward (or the loosened wire 4 is pulled up) in a state in which the steady rest 5 is prevented from falling. Accordingly, the lower end of the operating bar 11 can be detached from the support piece 9 by pulling up the inclined operating bar 11 so as to be in the standing posture.

この場合、図７のように傾斜姿勢の作動バー１１の上端部のワイヤ取付け部１３をワイヤ４で引き上げるので、作動バー１１が横軸１０を中心に回動して起立姿勢になるための回動角度は、傾斜姿勢から起立姿勢となるまでの小さな角度（傾斜姿勢が実施形態のように略１０〜３０°、好ましくは略１５〜２０°の回動角度と小さな回動角度）であるため、回動時における作動バー１１の下端部が支持片９上面からすぐ引き上げられて離れるため、作動バー１１の下端部が支持片９の上面を擦るようにして移動する距離が短い又は殆ど擦らない。このため、振れ止め５をリーダ２から離れる方向に移動させようとする水平力が殆ど作用しない又は水平力が作用しても小さく、ガイド部６がガイドレール７に強く押圧されず、また、作動バー１１の回動する際の支持片９の上面との抵抗も小さい。この結果、ワイヤ４で引き上げる際、作動バー１１や横軸１０に無理な力が作用しないようにして損傷を防止すると共に、大きな抵抗を受けることなく作動バー１１を支持片９から脱離させてスムーズに吊り上げることができる。   In this case, as shown in FIG. 7, the wire attaching portion 13 at the upper end portion of the operation bar 11 in the inclined posture is pulled up by the wire 4, so that the operation bar 11 rotates around the horizontal axis 10 to be in the standing posture. The moving angle is a small angle from the inclined posture to the standing posture (the inclined posture is approximately 10 to 30 °, preferably approximately 15 to 20 ° and preferably a small rotation angle as in the embodiment). Since the lower end of the operating bar 11 is immediately lifted away from the upper surface of the support piece 9 during rotation, the moving distance of the lower end of the operating bar 11 so as to rub the upper surface of the support piece 9 is short or hardly rubbed. . For this reason, the horizontal force to move the steady rest 5 in the direction away from the reader 2 is hardly applied or small even when the horizontal force is applied, and the guide portion 6 is not strongly pressed against the guide rail 7 and is operated. The resistance with the upper surface of the support piece 9 when the bar 11 rotates is also small. As a result, when the wire 4 is pulled up, an excessive force is not applied to the operating bar 11 and the horizontal shaft 10 to prevent damage, and the operating bar 11 is detached from the support piece 9 without receiving a large resistance. Can be lifted smoothly.

なお、図１、図８の実施形態では、掘削軸３を囲む上下方向に伸縮自在な筒状をした飛散防止カーテン２４であって、上端部に設けた保持部を掘削軸３に回転自在に被嵌してあると共に、下端部を振れ止め５の上端に接続してあり、掘削軸３の昇降に伴って飛散防止カーテン２４が上下方向に伸縮し、掘削軸３の昇降の際に掘削軸３の回転に伴って上昇した泥土が飛散するのを防止するようになっている。もちろん、飛散防止カーテン２４を設けなくてもよいものである。   In the embodiment of FIGS. 1 and 8, the scattering prevention curtain 24 has a cylindrical shape that can extend and contract in the vertical direction surrounding the excavation shaft 3, and a holding portion provided at the upper end portion is rotatable about the excavation shaft 3. The lower end is connected to the upper end of the steady rest 5 and the scattering prevention curtain 24 expands and contracts in the vertical direction as the excavation shaft 3 moves up and down. The mud that has risen with the rotation of 3 is prevented from scattering. Of course, the scattering prevention curtain 24 may not be provided.

１ 回転装置
２ リーダ
３ 掘削軸
４ ワイヤ
５ 振れ止め
６ ガイド部
７ ガイドレール
８ 落下防止装置
９ 支持片
１０ 横軸
１１ 作動バー
１２ ばね材
１３ ワイヤ取付け部
１４ 回動阻止部 DESCRIPTION OF SYMBOLS 1 Rotating device 2 Leader 3 Excavation shaft 4 Wire 5 Stabilization 6 Guide part 7 Guide rail 8 Fall prevention device 9 Support piece 10 Horizontal axis 11 Actuation bar 12 Spring material 13 Wire attachment part 14 Rotation prevention part

Claims (1)

回転装置を上下移動自在に取付けたリーダと、回転装置に取付けられて回転駆動する掘削軸と、ワイヤにより吊下げられて上記掘削軸の周囲を囲んで掘削軸の横振れを規制するための筒状の振れ止めと、振れ止めに設けたガイド部と、ガイド部が上下移動自在に嵌め込まれるリーダに設けたガイドレールと、ワイヤが切断又は弛んだ際に振れ止めの落下を防止する落下防止装置とを備え、
上記落下防止装置が、リーダに設けた支持片と、振れ止めに横軸で回動自在に取付けた作動バーと、横軸を中心に作動バー下部がリーダに近づく方向に回動するようにばね力を付与するばね材と、作動バーの上端部に設けた上記振れ止めを吊下げる上記ワイヤを取付けるためのワイヤ取付け部と、ばね材のばね力で作動バーが回動した際に作動バーが斜めに傾斜した状態でそれ以上の回動を阻止する回動阻止部を備え、
振れ止めをワイヤで吊下げた際にばね材のばね力に抗して振れ止めが起立姿勢となることで、作動バーが支持片に当たることなく振れ止めが上下移動可能に構成され、
ワイヤが切断又は弛んだ際に、ばね材のばね力で作動バーが回動して回動阻止部で回動が阻止されて傾斜姿勢が保持された状態で、該傾斜姿勢に保持された作動バーの下端が支持片上に当接して振れ止めの落下を防止することを特徴とする掘削軸の振れ止めの落下防止装置。

A reader on which the rotating device is mounted so as to be movable up and down, an excavation shaft attached to the rotating device and driven to rotate, and a tube suspended by a wire to surround the excavating shaft and to regulate the lateral deflection of the excavating shaft -Shaped steady rest, a guide part provided on the steady rest, a guide rail provided on the leader into which the guide part can be freely moved up and down, and a fall prevention device that prevents the steady rest from falling when the wire is cut or loosened And
The fall prevention device includes a support piece provided on the reader, an operation bar rotatably attached to the steady rest on the horizontal axis, and a spring so that the lower part of the operation bar rotates about the horizontal axis toward the reader. A spring material for applying force, a wire attachment portion for attaching the wire for suspending the steady rest provided at the upper end of the operation bar, and the operation bar when the operation bar is rotated by the spring force of the spring material. With a rotation prevention part that prevents further rotation in an inclined state,
When the steady rest is suspended with a wire, the steady rest is in an upright posture against the spring force of the spring material, so that the steady rest can be moved up and down without the operation bar hitting the support piece,
When the wire is cut or slackened, the operation bar is rotated by the spring force of the spring material, and the rotation is blocked by the rotation blocking portion, and the operation held in the inclined position is held in the inclined position. An anti-falling device for the steadying of the excavating shaft, wherein the lower end of the bar abuts on the support piece to prevent the steadying from falling.

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014173382A (en) * 2013-03-12 2014-09-22 Nippon Sharyo Seizo Kaisha Ltd Pile driver
KR101560212B1 (en) 2013-06-25 2015-10-14 신의페트라 주식회사 Modular reinforced leader for pile driver

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0540107Y2 (en) * 1987-12-04 1993-10-12
JPH0630294U (en) * 1992-09-22 1994-04-19 鉱研工業株式会社 Screw auger steady rest
JP2001003361A (en) * 1999-06-25 2001-01-09 R S Japan Reader:Kk Pile driver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0540107Y2 (en) * 1987-12-04 1993-10-12
JPH0630294U (en) * 1992-09-22 1994-04-19 鉱研工業株式会社 Screw auger steady rest
JP2001003361A (en) * 1999-06-25 2001-01-09 R S Japan Reader:Kk Pile driver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014173382A (en) * 2013-03-12 2014-09-22 Nippon Sharyo Seizo Kaisha Ltd Pile driver
KR101560212B1 (en) 2013-06-25 2015-10-14 신의페트라 주식회사 Modular reinforced leader for pile driver

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