JPH086103Y2 - Multiple rod excavator - Google Patents

Description

【考案の詳細な説明】 （産業上の利用分野） 本考案は、地盤改良目的に使用して好適な多重ロッド
式掘削機に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a multi-rod excavator suitable for use in ground improvement purposes.

（従来の技術） 主として軟弱地盤を改良する手段として、地表から削
孔し、その内部にセメントミルク等の地盤改良材を注入
して土砂と混練し、これを硬化することにより軟弱な地
盤を強化する地盤改良工法が広く用いられている。(Prior art) As a means mainly for improving soft ground, drilling holes from the surface of the ground, injecting ground improvement material such as cement milk into the interior, kneading with soil and sand, and hardening it to strengthen the soft ground The ground improvement method is widely used.

上記工法を実施するに当り、従来掘削ロッドを二重管
構造とし、これをリーダマストに昇降自在に装着された
駆動部に回転駆動可能に垂設し、外側管の下部外周の撹
伴翼を、この外側管に挿通されてその下端から突出する
内側管の下端に掘削ヘッドをそれぞれ設け、この掘削ヘ
ッドを低回転高トルクで回転駆動して削孔しながら内側
管を通じセメントミルクを注入し、撹伴翼を高速回転さ
せて掘削土砂とセメントミルクとを撹伴混練するように
なされたもの（特公平1-29930号公報）がある。In carrying out the above construction method, the conventional excavation rod has a double pipe structure, which is vertically rotatably movably mounted on a drive unit which is mounted on a leader mast so as to be able to move up and down. , Each of which is provided with a drilling head at the lower end of the inner pipe which is inserted through the outer pipe and protrudes from the lower end thereof, and the cement milk is injected through the inner pipe while drilling by driving the drilling head with low rotation and high torque, There is one (Japanese Patent Publication No. 1-29930) in which the stirring blade is rotated at a high speed to stir and mix the excavated soil and cement milk.

（考案が解決しようとする課題） しかして従来の掘削機は、内外二重管を共に駆動部に
吊持する構成であるから、地盤の深層の改良に供しよう
とする場合には内側管および外側管をそれぞれ継ぎ足し
て長尺化させるか、あるいはリーダマストを高くし、
内、外側管をいずれも長尺として駆動部に垂設するかの
いずれかによることになるが、内、外側管を継ぎ足して
使用するにはその継ぎ足し作業が煩雑であり、これを作
業現場で行うことになるため容易でなく、その継ぎ足し
作業のために本来の地盤改良作業の作業能率が著しく低
下するという問題がある。また予め内、外側管を長尺に
形成して深層改良に対応し得るようにすると、リーダマ
ストの高さをそれに見合うだけ高くしなければならず、
かつ重量の大きい駆動部をリーダマストの上方に位置さ
せることになるので、装置全体がきわめて不安定にな
り、装置そのものも大型化せざるを得なくなるという問
題がある。(Problems to be solved by the invention) However, since the conventional excavator has a structure in which the inner and outer double pipes are both suspended in the drive unit, when the deep excavation of the ground is attempted, the inner pipe and To increase the length by adding the outer pipes respectively, or increasing the leader mast,
It depends on whether the inner and outer pipes are hung vertically on the drive part, but it is complicated to add and use the inner and outer pipes at the work site. This is not easy because it is performed, and there is a problem that the work efficiency of the original ground improvement work is significantly reduced due to the replenishment work. In addition, if the inner and outer pipes are formed to be long in advance and it is possible to cope with the deep layer improvement, the height of the leader mast must be increased as much as possible,
Moreover, since the heavy drive section is located above the leader mast, the entire apparatus becomes extremely unstable, and the apparatus itself has to be increased in size.

本考案はこれに鑑み、リーダマストを高くすることな
く、かつ掘削ロッドの継ぎ足し作業を不要として深層地
盤の改良に供することができる多重ロッド式掘削機を提
供するにある。In view of this, it is an object of the present invention to provide a multi-rod type excavator that can be used for improvement of deep ground without increasing the leader mast and eliminating the work of adding excavating rods.

（課題を解決するための手段） 上記従来技術が有する課題を解決するため、本考案
は、リーダマストに昇降自在に装着された駆動部と、こ
の駆動部の下部に回転駆動自在に垂設され軸方向に伸縮
可能とされた多重ロッドと、この多重ロッドの軸心に挿
通され前記駆動部に回転伝達を受けるように貫通されて
駆動部の上方に延出された芯管とを有し、前記多重ロッ
ドの下部外周に撹伴翼を、芯管の下端に掘削ヘッドをそ
れぞれ設け、前記多重ロッドにはその伸長時および短縮
時に相互に固定する結合手段を設けた構成を特徴とする
ものである。(Means for Solving the Problems) In order to solve the problems of the above-described conventional technology, the present invention provides a drive unit that is mounted on a reader mast so as to be able to move up and down, and is rotatably hung vertically below the drive unit. An axially expandable / contractible multiple rod, and a core tube that is inserted into the axial center of the multiple rod and is penetrated so as to receive rotation transmission to the drive unit, and extends above the drive unit. A stirring blade is provided on the outer periphery of the lower part of the multi-rod, an excavation head is provided on the lower end of the core tube, and a coupling means for fixing the multi-rod to each other when the multi-rod is extended and shortened is provided. is there.

（作用） 掘削開始時には、多重ロッドを短縮させておき、芯管
および多重ロッドをそれぞれ回転駆動して芯管下端の掘
削ヘッドにより地盤を削孔しつつ掘削ヘッドの下端から
地盤改良材を注入し、多重ロッド下部の撹伴翼により掘
削土砂と地盤改良材とを撹伴混練する。短縮状態にある
多重ロッドが予定の深度まで掘削したとき回転を停め、
結合手段を解いて駆動部をリーダマストの上方へ移動さ
せれば、多重ロッドの最外側の管が芯管とともに地中に
とり残され、内側の管のみが駆動部と共に引上げられ
る。引上げ後再び結合手段により管相互を結合し、再び
駆動部により回転駆動して掘削を進めれば、外側の管は
地中深く掘進し、続いて内側の管も地中に進入して深層
まで地盤の改良が行われる。作業終了後は上記掘削時と
は逆の手順により多重ロッドを短縮させることにより元
の状態に復する。(Operation) At the start of excavation, the multiple rods are shortened, and the core pipe and the multiple rods are rotationally driven, respectively, and the ground improvement material is injected from the lower end of the drilling head while drilling the ground by the drilling head at the lower end of the core pipe. , The excavated soil and the ground improvement material are agitated and kneaded by the agitating blades at the bottom of the multi-rod. When the multiple rod in the shortened state has excavated to the planned depth, the rotation is stopped,
When the driving means is moved above the leader mast by releasing the coupling means, the outermost pipe of the multiple rod is left in the ground together with the core pipe, and only the inner pipe is pulled up together with the driving part. After pulling up, the pipes are connected again by the connecting means, and when the excavation is carried out again by rotationally driving by the drive unit, the outer pipe is dug deep into the ground, and then the inner pipe also goes into the ground to reach the deep layer. The ground will be improved. After the work is completed, the multiple rods are shortened by the procedure reverse to the above-mentioned excavation to restore the original state.

（実施例） 以下、本考案を図面に示す実施例を参照して説明す
る。(Embodiment) Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings.

第１図および第２図は、本考案による多重ロッド式掘
削機の全体構成の側面および正面を示すもので、同図に
おいて符号１は、自走式の作業機械２に支持枠３、ジャ
ッキ４等により垂直に支持されるリーダマストであり、
このリーダマスト１の外側面のガイドレール５に駆動部
６がスライド部材7,7を介して昇降自在に支持されてい
る。1 and 2 show a side view and a front view of the overall structure of a multi-rod excavator according to the present invention. In FIG. 1, reference numeral 1 denotes a self-propelled working machine 2, a support frame 3, and a jack 4. It is a leader mast that is vertically supported by
A drive unit 6 is supported by guide rails 5 on the outer side surface of the leader mast 1 so as to be vertically movable via slide members 7, 7.

この駆動部６の下部には多重ロッド８が回転自在に垂
下支持され、この多重ロッド８の軸心に挿通する芯管９
が駆動部６を貫通して上方に延出されている。図におけ
る多重ロッド８は、便宜上外側管8Aと内側管8Bとからな
る二重管とした場合を示しており、芯管９は角形管（例
えば正四角形）からなり、その下端には掘削ヘッド10
が、外側管8Aの下部外周には撹伴翼11が設けられてい
る。同図中12は多重ロッド８の下部支えである。A multi-rod 8 is rotatably supported by a lower portion of the drive unit 6, and a core tube 9 is inserted through the axis of the multi-rod 8.
Extends through the drive unit 6 and extends upward. The multi-rod 8 in the figure shows a case where it is a double tube consisting of an outer tube 8A and an inner tube 8B for convenience, and the core tube 9 is a square tube (for example, a square), and the excavating head 10 is at the lower end thereof.
However, a stirring blade 11 is provided on the outer periphery of the lower portion of the outer pipe 8A. In the figure, 12 is a lower support of the multiple rod 8.

駆動部６は、第３図に断面を、第４図に平面を示すよ
うに、リーダマスト１に支持される基台13上に多重ロッ
ド８を回転駆動するためのモータ14と、芯管９を回転駆
動するためのモータ15が搭載されている。The drive unit 6 has a motor 14 for rotationally driving the multiple rod 8 on a base 13 supported by the reader mast 1 and a core tube 9 as shown in a cross section in FIG. 3 and a plan view in FIG. A motor 15 for rotating and driving is mounted.

基台13には、芯管９が回転不能で上下動可能に挿通さ
れる第１回転部材16が軸受17を介して回転自在に支持さ
れており、この第１回転部材16の外周に設けられたギャ
18に芯管駆動用モータ15の出力軸19上のギャ20が噛合さ
れている。A first rotating member 16 through which the core tube 9 is non-rotatably and vertically movably inserted is rotatably supported on a base 13 via a bearing 17, and is provided on the outer periphery of the first rotating member 16. Gya
A gear 20 on an output shaft 19 of the core tube driving motor 15 is meshed with the shaft 18.

前記第１回転部材16の下方部には、多重ロッド８を支
持する第２回転部材21が軸受22,22を介して回転自在に
外嵌されており、この第２回転部材21の外周に設けられ
たギャ23に多重ロッド駆動用モータ14の出力軸24上のギ
ヤ25が噛合されている。A second rotating member 21 that supports the multiple rod 8 is rotatably fitted on the lower portion of the first rotating member 16 via bearings 22, 22, and is provided on the outer periphery of the second rotating member 21. The gear 25 on the output shaft 24 of the multiple rod drive motor 14 is meshed with the gear 23.

一方、基台13には、芯管９と第１回転部材16とを離接
させるクラッチ機構26が設けられている。このクラッチ
機構26は、基台13上に設立された伸縮装置（図示の例で
は油圧シリンダ）27,27により上下動する支持部材28に
軸受29,29を介して支持され芯管９が不回転に挿通する
嵌合部材30と、この嵌合部材30の下部に軸31,31により
揺動自在に垂設され芯管９の側面に圧接係合する複数個
の楔部材32,32とを有し、この楔部材32,32はその背面が
テーパー面32A,32Aとされた楔状をなし、前記第１回転
部材16の上部に形成された傾斜面16A,16Aと芯管９の側
面とで形成される隙間に前記伸縮装置27,27により楔合
されるようになっており、この楔合時に駆動部６と芯管
９とが実質上一体化され、楔合が解かれたときは芯管９
が駆動部６に対し昇降することができるようになってい
る。On the other hand, the base 13 is provided with a clutch mechanism 26 that separates and contacts the core tube 9 and the first rotating member 16. This clutch mechanism 26 is supported via a bearing 29, 29 by a support member 28 that moves up and down by a telescopic device (hydraulic cylinder in the illustrated example) 27, 27 installed on the base 13, and the core tube 9 does not rotate. And a plurality of wedge members 32 and 32 which are vertically oscillated by shafts 31 and 31 and which are press-fitted to the side surface of the core tube 9 and are fitted to the lower portion of the fitting member 30. The wedge members 32, 32 are wedge-shaped with their back surfaces being tapered surfaces 32A, 32A, and are formed by the inclined surfaces 16A, 16A formed on the upper part of the first rotating member 16 and the side surfaces of the core tube 9. The expansion / contraction device 27, 27 is wedged into the gap to be formed, and the drive unit 6 and the core tube 9 are substantially integrated during the wedge engagement, and when the wedge engagement is released, the core tube is released. 9
Can be moved up and down with respect to the drive unit 6.

多重ロッド８の伸縮時および短縮時における管相互の
結合手段33は、第７図および第８図に示すように内側管
8Bの外面軸方向所要長さにわたり突設された長い突条34
と、この突条34の上下端に間隔L,Lをおいて突設された
短い上部突起35および下部突起36と、外側管8Aの上端部
内面に固設され前記上部突起35および下部突起36に嵌合
しかつ前記間隔L,Lに嵌入し得る突部37,37を有する係合
凹部38を備えた係合部材39と、この係合部材39の係合凹
部38を塞ぐように外側管8Aの上端から嵌合されるコッタ
部材49とからなっている。なおこの係合部材39は、内、
外側管8A,8B相互の上下方向および回転方向の拘束結合
が行なえるものであれば図示の形状構造によらずともよ
く、他に適宜な手段を採用することができる。When the multiple rods 8 are expanded and contracted and shortened, the connecting means 33 for connecting the tubes are provided with inner tubes as shown in FIGS. 7 and 8.
Long ridge 34 protruding from the outer surface of 8B over the required axial length
A short upper protrusion 35 and a lower protrusion 36 protruding from the upper and lower ends of the protrusion 34 at intervals L and L, and the upper protrusion 35 and the lower protrusion 36 fixedly mounted on the inner surface of the upper end of the outer tube 8A. An engaging member 39 having an engaging recess 38 having projections 37, 37 that can be fitted into the space L, and can be fitted in the spaces L, L, and an outer pipe so as to close the engaging recess 38 of the engaging member 39. The cotter member 49 is fitted from the upper end of 8A. Incidentally, this engaging member 39,
As long as the outer tubes 8A and 8B can be restrained and coupled in the vertical direction and the rotational direction, the shape and structure shown in the drawing may be omitted, and other appropriate means can be adopted.

撹伴翼11は、外側管8Aの下部外周に適当数設けられる
もので、図示の例では外側管8Aの下端近くの直径方向
と、これより上方で直交する方向との２段として設けら
れており、これら撹伴翼11は外側管8Aの回転方向ａに対
し土砂を押し上げる方向に傾斜が与えられている。The agitation blades 11 are provided in an appropriate number on the outer periphery of the lower portion of the outer tube 8A, and in the example shown in the figure, they are provided in two stages of a diametrical direction near the lower end of the outer tube 8A and a direction orthogonal to the upper side. The agitating blades 11 are inclined in the direction of pushing up the earth and sand with respect to the rotation direction a of the outer pipe 8A.

芯管９の下端で内側管8B内に位置する部位の円筒状を
なす外周面には第９図に示すように芯管９の回転方向ｂ
に対し土砂を下降させて下方へ排除させる方向のスクリ
ュ翼41が数ピッチ分螺旋状に突設されている。As shown in FIG. 9, the direction of rotation b of the core tube 9 is shown on the cylindrical outer peripheral surface of the portion located inside the inner tube 8B at the lower end of the core tube 9.
On the other hand, screw blades 41 in a direction in which the earth and sand are descended and removed downward are provided in a spiral shape for several pitches.

芯管９の上端にはスイベル装置42があり、このスイベ
ル装置42にホース43が接続されていて、地上からセメン
トミルク等の地盤改良材を供給し、芯管９内を通じてそ
の下端の吐出口44から掘削土砂中に地盤改良材を噴出さ
せるようになっている。なおこの地盤改良材の供給は多
重ロッド８内を通じて行なうようにしてもよく、その場
合には芯管９は無空のロッドでよい。A swivel device 42 is provided at the upper end of the core tube 9, and a hose 43 is connected to the swivel device 42 to supply a ground improvement material such as cement milk from the ground, and a discharge port 44 at the lower end through the core tube 9. It is designed to eject ground improvement material into the excavated soil. The ground improvement material may be supplied through the multiple rods 8, in which case the core tube 9 may be an empty rod.

つぎに上記実施例の作用を説明する。 Next, the operation of the above embodiment will be described.

掘削開始時には、第10図（Ａ）のように多重ロッド８
を短縮させ、結合手段33の係合部材39の係合凹部38を内
側管8Bの上部突起35に嵌合させてコッタ部材40を嵌入さ
せ、内、外側管8A,8Bを上下方向および回転方向とも拘
束させておく。またチャック機構26の伸縮装置27,27を
短縮作動して楔部材32,32を第１回転部材16の傾斜面16
A,16Aと芯管９の側面とに圧着させて芯管９を駆動部６
側に固定しておく。At the start of excavation, as shown in Fig. 10 (A), the multiple rod 8
, The engaging recess 38 of the engaging member 39 of the coupling means 33 is fitted into the upper protrusion 35 of the inner pipe 8B to fit the cotter member 40, and the inner and outer pipes 8A and 8B are moved in the vertical and rotational directions. I will also restrain you. Further, the expansion / contraction devices 27, 27 of the chuck mechanism 26 are shortened to move the wedge members 32, 32 to the inclined surface 16 of the first rotating member 16.
The core tube 9 is driven by pressing the A and 16A and the side surface of the core tube 9 by pressure.
It is fixed on the side.

ついでモータ14,15を起動すると、モータ14の回転は
ギャ25,23を通じて第２回転部材21に伝達され、内、外
側管8A,8Bを第５図矢印ａ方向へ回転させる。またモー
タ15の回転はギャ20,18を通じて第１回転部材16に伝達
され、芯管９を第５図矢印ｂ方向へ回転させる。Then, when the motors 14 and 15 are started, the rotation of the motor 14 is transmitted to the second rotating member 21 through the gears 25 and 23, and the inner and outer tubes 8A and 8B are rotated in the direction of arrow a in FIG. The rotation of the motor 15 is transmitted to the first rotating member 16 through the gears 20 and 18, causing the core tube 9 to rotate in the direction of arrow b in FIG.

これにより芯管９の下端の掘削ヘッド10により地盤を
掘削しつつ駆動部６の重量負荷により地中を掘進して削
孔がなされる一方、スイベル装置42から芯管９内を通じ
て地盤改良材が供給され、芯管９の下端の吐出口44から
地中に噴出されて外側管8Aの下部にある撹伴翼11により
掘削土砂と地盤改良材とが混練される。このとき撹伴翼
11の傾斜角により混練土砂は上方へ押しやられ、下方へ
圧密することはない。また掘削ヘッド10により掘削され
た土砂は芯管９のスクリュ41により下方へ排土されるの
で、内側管8B内に土砂の進入がない。As a result, while excavating the ground by the excavation head 10 at the lower end of the core tube 9, the weight load of the drive unit 6 excavates the ground to form a hole, while the swivel device 42 allows the ground improvement material to pass through the inside of the core tube 9. It is supplied, jetted into the ground from the discharge port 44 at the lower end of the core tube 9, and the excavated soil and the ground improvement material are kneaded by the stirring blades 11 at the lower part of the outer tube 8A. At this time, the stirring wing
The inclination angle of 11 pushes the kneaded soil upwards and does not consolidate downwards. Further, since the earth and sand excavated by the excavation head 10 are discharged downward by the screw 41 of the core tube 9, the earth and sand do not enter the inner pipe 8B.

短縮状態にある多重ロッド８が予定の深度まで掘削し
たとき（第10図（Ｂ））、モータ14,15を停止し、結合
手段33のコッタ部材40を上方へ抜き、内側管8Bをモータ
14を使用して回転させ、係合部材39の係合凹部38と上部
突起35との嵌合を外し、クラッチ機構26の伸縮装置27,2
7を伸長作動して楔部材32,32を上昇させ、芯管９の拘束
を解き、ついで駆動部６をリーダマスト１の上方へ図示
しないウインチ、ワイヤ等により引上げれば、外側管8A
および芯管９の下半部が地中にとり残され、内側管8Bの
みが駆動部６と一緒に引上げられる（第10図（Ｃ））。When the multiple rod 8 in the shortened state is excavated to a predetermined depth (Fig. 10 (B)), the motors 14 and 15 are stopped, the cotter member 40 of the coupling means 33 is pulled upward, and the inner pipe 8B is moved to the motor.
14 is rotated to disengage the engagement recess 38 of the engagement member 39 from the upper protrusion 35, and the expansion / contraction device 27, 2 of the clutch mechanism 26 is disengaged.
When the wedge members 32, 32 are lifted by extending 7 to release the restraint of the core tube 9, and then the drive unit 6 is pulled up above the leader mast 1 by a winch, wire or the like (not shown), the outer tube 8A
And the lower half of the core tube 9 is left in the ground, and only the inner tube 8B is pulled up together with the drive unit 6 (Fig. 10 (C)).

引上げ後、再び結合手段33およびクラッチ機構26を前
記と同様にして結合させ、再び駆動部６により回転駆動
して掘削を進めれば、第10図（Ｄ）のように外側管8Aは
地中深く掘進し、続いて内側管8Bも地中に進入して深層
まで地盤の改良を行なうことができる。After pulling up, the coupling means 33 and the clutch mechanism 26 are coupled again in the same manner as described above, and when the excavation is advanced by rotationally driving the driving section 6 again, the outer pipe 8A is underground as shown in FIG. 10 (D). It is possible to dig deep, and then the inner pipe 8B can also enter the ground to improve the ground to a deeper level.

作業終了後は、第11図（Ａ）〜（Ｃ）のように前記掘
削時とは逆の手順により引抜く。すなわち第10図（Ｄ）
の掘削終了状態からそのまま引上げて外側管8Aの上方部
を地表に露出させ（第11図（Ａ））、ついで駆動部６を
下げて外側管8A内に内側管8Bを納め、そして内、外側管
8A,8Bを共に引上げれば第11図（Ｂ）〜（Ｃ）のように
初期の状態（第10図（Ａ））に復する。After the completion of the work, as shown in FIGS. 11 (A) to 11 (C), the procedure is the reverse of that for the excavation. That is, Fig. 10 (D)
From the end of excavation, the upper part of the outer pipe 8A is exposed to the surface of the earth (Fig. 11 (A)), and then the drive unit 6 is lowered to accommodate the inner pipe 8B in the outer pipe 8A, and the inner and outer pipes. tube
If both 8A and 8B are pulled up, the state returns to the initial state (Fig. 10 (A)) as shown in Figs. 11 (B) to (C).

なお、本実施例では地盤改良を目的とする掘削機とし
た場合について説明したが、削孔のみを目的とする場合
には地盤改良材の供給手段を省略することにより深孔掘
削機として使用することができる。また多重ロッド８に
ついては、図示実施例では内、外側管8A,8Bの二重管構
造とした場合を説明したが、内側管8Bの内側にさらに内
側管を嵌合し、結合手段38を付加すれば三重管構造とす
ることができ、目的に応じて選択することができる。さ
らに他の各部の構成に関しても図示の実施例に限定され
るものではなく、適宜設計変更し得ることはもちろんで
ある。In the present embodiment, the case where the excavator is intended for ground improvement has been described. However, when the purpose is only for drilling, it is used as a deep hole excavator by omitting the means for supplying the ground improving material. be able to. In the illustrated embodiment, the multiple rod 8 has been described as having a double pipe structure of the outer pipes 8A and 8B, but the inner pipe is further fitted inside the inner pipe 8B, and the connecting means 38 is added. If so, a triple tube structure can be obtained, and it can be selected according to the purpose. Further, the configuration of each of the other parts is not limited to the illustrated embodiment, and it goes without saying that the design can be appropriately changed.

〔考案の効果〕[Effect of device]

以上説明したように本考案によれば、掘削ロッドを多
重管構造とし、これを伸縮させることにより深層まで削
孔することができるので、作業の途中で管を継ぎ足す余
分な手数が掛らず、掘削作業の作業能率を大幅に向上さ
せることができる。また駆動部が比較的低い位置におい
て昇降すれば足りるのでリーダマストの高さが低くで
き、装置全体の安定性を頗る高めることができ、作業機
械も大型化せずともよい。特に下端に掘削ヘッドを有す
る芯管は駆動部を貫通して駆動部の上方に延出する構成
としたので、芯管は必要最小限の太さに留めることがで
き、全体の管径を細く構成することができるとともに構
造が簡単にできるなどの効果がある。As described above, according to the present invention, the drilling rod has a multi-pipe structure, and by expanding and contracting it, it is possible to drill holes to a deep layer, so that it is not necessary to add pipes during the work. , The work efficiency of excavation work can be significantly improved. Further, since it suffices if the drive unit moves up and down at a relatively low position, the height of the leader mast can be made low, the stability of the entire apparatus can be greatly enhanced, and the working machine does not have to be made large. In particular, the core tube with the drilling head at the lower end is configured to penetrate the drive unit and extend above the drive unit, so the core pipe can be kept to the minimum necessary thickness and the overall pipe diameter can be reduced. There is an effect that it can be configured and the structure is simple.

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

第１図は本考案による多重ロッド式掘削機の全体構成例
を示す側面図、第２図は同正面図、第３図は同駆動部の
拡大断面図、第４図は同平面図、第５図は同多重ロッド
の短縮時の正面図、第６図は同伸長時の正面図、第７図
は第５図における結合手段の拡大図、第８図は第７図VI
II-VIII線断面図、第９図は同芯管下部を示す正面図、
第10図（Ａ）〜（Ｄ）は掘削工程時の説明図、第11図
（Ａ）〜（Ｃ）は引抜き工程時の説明図である。 １……リーダマスト、６……駆動部、８……多重ロッ
ド、９……芯管、10……掘削ヘッド、11……撹伴翼、1
4,15……モータ、16……第１回転部材、21……第２回転
部材、26……クラッチ機構、27……伸縮装置（油圧シリ
ンダ）、32……楔部材、33……結合手段、34……突条、
35……上部突起、36……下部突起、39……係合部材、40
……コッタ部材、42……スイベル装置。FIG. 1 is a side view showing an example of the overall configuration of a multi-rod excavator according to the present invention, FIG. 2 is a front view thereof, FIG. 3 is an enlarged sectional view of the same drive unit, FIG. 4 is a plan view thereof, and FIG. Fig. 5 is a front view of the multiple rod when it is shortened, Fig. 6 is a front view of the same rod when it is extended, Fig. 7 is an enlarged view of the connecting means in Fig. 5, and Fig. 8 is Fig. 7 VI.
II-VIII line sectional view, FIG. 9 is a front view showing the lower portion of the concentric tube,
10 (A) to (D) are explanatory views during the excavation process, and FIGS. 11 (A) to (C) are explanatory views during the extraction process. 1 ... Leader mast, 6 ... Driving unit, 8 ... Multi-rod, 9 ... Core tube, 10 ... Drilling head, 11 ... Stirring blade, 1
4,15 ... motor, 16 ... first rotary member, 21 ... second rotary member, 26 ... clutch mechanism, 27 ... extension device (hydraulic cylinder), 32 ... wedge member, 33 ... coupling means , 34 …… ridge,
35: upper protrusion, 36: lower protrusion, 39: engaging member, 40
...... Cotter member, 42 …… Swivel device.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】リーダマストに昇降自在に装着された駆動
部と、この駆動部の下部に回転駆動自在に垂設され軸方
向に伸縮可能とされた多重ロッドと、この多重ロッドの
軸心に挿通され前記駆動部に回転伝達を受けるように貫
通されて駆動部の上方に延出された芯管とを有し、前記
多重ロッドの下部外周に撹伴翼を、芯管の下端に掘削ヘ
ッドをそれぞれ設け、前記多重ロッドにはその伸長時お
よび短縮時に相互に固定する結合手段を設けてなる多重
ロッド式掘削機。1. A drive unit mounted on a leader mast so as to be able to move up and down, a multiple rod vertically rotatably mounted below the drive unit and extendable and contractible in an axial direction, and an axial center of the multiple rod. A core tube that is inserted and penetrates so as to receive rotation transmission from the drive unit and extends above the drive unit.A stirring blade is provided on the lower outer periphery of the multiple rod, and an excavation head is provided at the lower end of the core pipe. And a connecting means for fixing each of the multiple rods to each other when the multiple rods are extended and shortened.