JPS6059396B2 - Vertical hole drilling equipment - Google Patents

Description

【発明の詳細な説明】 本発明は立礼掘削装置の改良に関するものてある。[Detailed description of the invention] TECHNICAL FIELD The present invention relates to an improvement of a Rirei drilling rig.

立礼の掘削には従来から様々な掘削方法や掘削装置が
開発され、実用化されているが、立礼には基礎抗として
の立礼、シールド機の発進用立礼あるいは到達用立孔用
等があり、その用途によつて深さや断面形状が様々であ
り、総ゆる立礼に適用できる掘削装置として定まつたも
のがなかつた。Various excavation methods and drilling equipment have been developed and put into practical use for the excavation of ryutei, but ryutei can be used as a foundation pit, for starting a shield machine, or for reaching a vertical hole. The depth and cross-sectional shape vary depending on the purpose, and there is no established drilling device that can be used for all types of drilling.

又、ケーソンエ法て作業室内に泥水を満たして泥水掘削
を行うことが開発されているが、掘削装置を旋回させる
場合には矩形断面の立礼が掘削できず、掘削ヘッドが１
台であるために大断面の場合には沈下速度が遅かつた。
本発明はこのような欠点を無くし、大断面で矩形断面
を有する立礼でも、２台の掘削ヘッドを回転旋回させ、
且つ掘削領域を２分することによつて能率よく掘削する
ことができる立礼掘削装置を提供するものである。Also, a method has been developed to perform muddy water excavation by filling the working chamber with muddy water using the caisson method, but when the drilling equipment is rotated, it is not possible to excavate a standing bow with a rectangular cross section, and the drilling head is
Because it is a platform, the sinking speed was slow when the cross section was large.
The present invention eliminates such drawbacks and allows two drilling heads to be rotated even in a standing ceremony with a large and rectangular cross section.
In addition, the present invention provides a standing excavation device that can excavate efficiently by dividing the excavation area into two.

本発明の実施例を図面によつて説明すれは、第１図に
おいて１は立礼２を掘削すべき地盤、３は立礼２に立て
込んたプレキヤストセグメントよりなる壁体で掘削する
立礼２の形状に応じて所望の断面形状に形成してある。An embodiment of the present invention will be explained with reference to the drawings. In Fig. 1, 1 is the ground where the ryatei 2 is to be excavated, and 3 is the shape of the ryatei 2 to be excavated with a wall made of precast segments built into the ryatei 2. It is formed into a desired cross-sectional shape accordingly.

４は壁体３の下端部外方に近接して立て込んた薄肉鋼製
の筒体て、立礼２の断面形状に応じて所望の断面形状に
形成されその内周を壁体３の外周よりも僅かに大きくし
て、その隙間にパッキング５を装入して水密にし、且つ
壁体ａに対して上下動可能にしてある。 ６は筒体４の
下部内周面の断面方向に設けた底床盤で、筒体４に水蜜
的に固着してある。７は底床盤６と所定間隔を存して、
その上方に底床盤６と平行に設けた作業床で、底床盤６
との間に機械室１５を形成してある。Reference numeral 4 denotes a thin-walled steel cylinder built close to the outside of the lower end of the wall 3, which is formed into a desired cross-sectional shape according to the cross-sectional shape of the standing room 2, and whose inner periphery is wider than the outer periphery of the wall 3. It is made slightly larger and a packing 5 is inserted into the gap to make it watertight and to allow it to move up and down with respect to the wall a. Reference numeral 6 denotes a bottom plate provided in the cross-sectional direction of the lower inner peripheral surface of the cylinder 4, and is tightly fixed to the cylinder 4. 7 is located at a predetermined distance from the bottom plate 6,
A work floor installed above the bottom floor panel 6 in parallel with the bottom floor panel 6.
A machine room 15 is formed between the two.

８は底床盤６と筒体４の下部によつて形成された掘削室
、９は該掘削室８の地盤を掘削するための掘削機械であ
る。8 is an excavation chamber formed by the bottom plate 6 and the lower part of the cylinder 4; 9 is an excavation machine for excavating the ground of the excavation chamber 8;

１０は推進用ジャッキで、その一端部を底床盤６の上面
に固定し、他端部を作業床７を貫通して前記壁体３の下
面にスプレツダー１１を介して押接させ、筒体４を壁体
３に対して下方に押進するものである。Reference numeral 10 denotes a propulsion jack, one end of which is fixed to the upper surface of the bottom floor board 6, the other end of which is passed through the work floor 7 and pressed against the lower surface of the wall 3 via a spreader 11, and the cylindrical 4 downwardly against the wall 3.

掘削機９は底床盤６の中心部を水密的に貫通して上下動
すると共に回転する中空回転軸１２と、該中空回転軸１
２の下端部に水平方向に取り付けた掘削アーム１３と、
該掘削アーム１３の両端部に後記の伸縮アーム２５を介
して取り付けた一対の回転掘削ヘッド１４，１４によつ
て構成されている。The excavator 9 has a hollow rotating shaft 12 that penetrates the center of the bottom plate 6 in a watertight manner and moves up and down as well as rotates, and the hollow rotating shaft 1
an excavation arm 13 horizontally attached to the lower end of 2;
It is comprised of a pair of rotary excavation heads 14, 14 attached to both ends of the excavation arm 13 via telescopic arms 25, which will be described later.

なお、掘削アーム１３は、その中心が中空回転軸１２の
中心に対して適宜寸法だけ偏心させて取り付けてある。
中空回転軸１２は第２図に示すように、底床盤６の上面
に突出した部分を一対のジャッキ１６，１６によつて作
動す一対の締付バンド１７，１７を介して締付けると共
に、該締付バンド１７，１７に回転駆動ジャッキ１８，
１８の一端部を枢着し、該回転駆動ジャッキ１８，１８
の他端部を前記底床盤６の適所に枢着し、ジャッキ１６
，１６及び１８，１８の反復作動によつて中空回転軸１
２を回転させるようにしてある。Note that the excavation arm 13 is attached so that its center is offset from the center of the hollow rotating shaft 12 by an appropriate dimension.
As shown in FIG. 2, the hollow rotary shaft 12 is tightened by a pair of tightening bands 17, 17 operated by a pair of jacks 16, 16 on the part protruding from the upper surface of the bottom plate 6. A rotation drive jack 18 is attached to the tightening bands 17, 17,
One end of 18 is pivotally connected to the rotary drive jacks 18, 18.
The other end is pivoted to a suitable position on the bottom floor board 6, and the jack 16 is
, 16 and 18, 18, the hollow rotating shaft 1
2 is rotated.

又、締付バンド１７，１７の上方において、第３図に示
すように、中空回転軸１２に突起１９を固着し、該突起
１９にスライド部材２０を摺接嵌合させ、該スライド部
材２０と前記作業床７の下面に固設した左右一対のスラ
ストジャッキ２１を連結し、該スラストジャッキ２１の
上下動によつて、スライド部材２０及び突起１９を介し
て中空回転軸１２を上下動させ、前記の回転掘削ヘッド
１４，１４を推進させるようにしてある。又、中空回転
軸１２の上端部には回転掘削ヘッドや油圧シリンダー等
の．油圧系統用の配管用回転接手２２を設けてある。第
４〜６図は掘削アーム１３と回転掘削ヘッド１４の関係
を示し、掘削アーム１３の固定枠２３に複数対の油圧シ
リンダー２４−ーーを内蔵し、該油圧シリンダー２４の
作動によつて伸縮アーム！２５を伸縮させて固定枠２３
の端面より出没させるようにし、該伸縮アーム２５の端
面には前記の回転掘削ヘッドを垂直に取り付けてある。
伸縮アーム２５の伸縮量は固定枠２３の長さと略々等し
くしてある。又、掘削アーム１３の固定枠２３は（前記
のように、その中心位置が中空回転軸１２の中心より偏
心するようにして中空回転軸１２の下端に取り付けてあ
るので、中空回転軸１２の中心から伸縮アーム２５の先
端までの長さは上記偏心量の２倍の差を生ずることにな
る。回転掘削ヘッド１４は第７図及び第８図に示すよう
に、駆動装置２６及びこれに連結した減速機２７をケー
ス２８に内蔵し、減速機２７を回転軸４４によつて底面
及び側面に複数個の切削刃３０及びスリット３１を設け
た有底円筒状の掘削具３２に接続し、該掘削具３２を前
記ケース２８の外周面に取り付けた蓋体２９によつて回
転可能に支承してある。Further, above the tightening bands 17, 17, as shown in FIG. A pair of left and right thrust jacks 21 fixedly installed on the lower surface of the work floor 7 are connected, and the vertical movement of the thrust jacks 21 moves the hollow rotating shaft 12 up and down via the slide member 20 and the protrusion 19. The rotary excavation heads 14, 14 are propelled. Further, the upper end of the hollow rotary shaft 12 is equipped with a rotary excavation head, a hydraulic cylinder, etc. A rotary joint 22 for piping for the hydraulic system is provided. 4 to 6 show the relationship between the excavation arm 13 and the rotary excavation head 14. A plurality of pairs of hydraulic cylinders 24 are built into the fixed frame 23 of the excavation arm 13, and when the hydraulic cylinders 24 are actuated, the telescopic arm ! Fixed frame 23 by expanding and contracting 25
The rotary excavation head is vertically attached to the end surface of the telescoping arm 25.
The amount of expansion and contraction of the telescoping arm 25 is made approximately equal to the length of the fixed frame 23. Furthermore, the fixed frame 23 of the excavation arm 13 is attached to the lower end of the hollow rotating shaft 12 so that its center position is eccentric from the center of the hollow rotating shaft 12 (as described above). The length from the end to the tip of the telescopic arm 25 will be twice the eccentricity mentioned above.The rotary drilling head 14 has a drive device 26 and a drive device connected thereto, as shown in FIGS. 7 and 8. A reducer 27 is housed in a case 28, and the reducer 27 is connected by a rotating shaft 44 to a bottomed cylindrical excavator 32 having a plurality of cutting blades 30 and slits 31 on the bottom and side surfaces, and The tool 32 is rotatably supported by a lid 29 attached to the outer peripheral surface of the case 28.

３３は排泥管で、その下端部に設けた呑口３４を蓋体２
９を貫通して掘削具３２の内方に臨ませてある。33 is a mud removal pipe, and a spout 34 provided at the lower end of the pipe is connected to the lid body 2.
9 and faces inward of the excavating tool 32.

排泥管３３は前記伸縮アーム２５に沿つて中空回転軸１
２の中空部３６に入り、中空部３６を経て、スイベルジ
ヨイント３７を介してて底床盤６に設置したポンプ３８
に接続してある。なお、排泥管３３と中空部３６の間隙
は中空部入口において水密にしてある。３９は掘削室８
内で掘削土に侵入した泥水をポンプ３８から地上のタン
ク４０に排出する配管、４１は泥水処理装置、４２は処
理水の貯蔵タンク４３から作業室７、底床盤６を水密的
に貫通して掘削室８まて処理水を送泥管５０を通じて送
給するポンプである。The mud removal pipe 33 is connected to the hollow rotating shaft 1 along the telescopic arm 25.
The pump 38 enters the hollow part 36 of 2, passes through the hollow part 36, passes through the swivel joint 37, and is installed in the bottom floor board 6.
It is connected to. Note that the gap between the mud draining pipe 33 and the hollow portion 36 is made watertight at the entrance of the hollow portion. 39 is excavation room 8
A pipe for discharging muddy water that has entered the excavated soil from a pump 38 to a tank 40 on the ground, 41 is a muddy water treatment device, and 42 is a pipe that penetrates from a treated water storage tank 43 to the work chamber 7 and the bottom plate 6 in a watertight manner. This is a pump that supplies treated water to the excavation chamber 8 through a mud feed pipe 50.

なお、排泥管３３、伸縮部はフレキシブルホースでもよ
く又、伸縮アーム２５の駆動シリンダー２４は多段式が
望ましい。Note that the mud drain pipe 33 and the telescoping section may be flexible hoses, and the drive cylinder 24 of the telescoping arm 25 is preferably of a multi-stage type.

上記のように構成し、先ず回転掘削ヘッド１４の駆動装
置を始動し、減速機２７、回転軸４４を介して掘削具３
２を回転させると共に、ポンプ３８，４２を始動して泥
水を掘削室８とタンク４０及び４３間を送泥管５０、排
泥管３３，３９を介して循環させる。With the above-mentioned configuration, first, the drive device of the rotary excavation head 14 is started, and the excavation tool 3 is
2 is rotated, and the pumps 38 and 42 are started to circulate muddy water between the excavation chamber 8 and the tanks 40 and 43 via the mud feeding pipe 50 and the mud draining pipes 33 and 39.

この泥水は送排泥量を調節すること及び水頭圧によつて
掘削室８内の圧力調節を行い、地下水の掘削室８内への
流入、ヒーピング等を防止すると共に、掘削土砂を地上
へ排出することを目的とするものである。次に作業床７
の下面に設けたスラストジャッキ２１を伸長して回転軸
１２を下方に押圧し、掘削アーム伸縮アーム２５を介し
て掘削ヘッド１４，１４を下方に押圧し、その位置で、
掘削具３２の底面に設けた切削刃３０によつて地盤を掘
削する。スラストジャッキ２１が一定長伸長すれば、次
にジャッキ１６を作動して締付バンド１７を締付けると
共に、ジャッキ１８を作動して中空回転軸１２を回転さ
せ、掘削アーム１３を水平方向に旋回させると、回転し
ている掘削具３２は水平方向に旋回しながら側面の切削
刃３０によつて地盤を掘削する。而して掘削アーム１３
は中空回転軸１２の中心と適宜寸法だけ偏心して取り付
けてあるので、一方の掘削ヘッド１４は筒体４の中心部
を掘削し他方の掘削ヘッド１４は筒体４の周辺部を掘削
する。このよ・うにして、ジャッキ１６及びジャッキ１
８の反復作動によつて中空回転軸１２が回転し、掘削ア
ーム１３が一旋回すると、伸縮アーム２５がシリンダー
２４の作動によつて順次伸長し、第９図に示すように掘
削ヘッド１４，１４の夫々の移動範囲４６，４７の地盤
を掘削する。このようにしてスラストジャッキ２１の全
伸長量だけの深さの立孔を掘削すれば、掘削アーム２５
とスラストジャッキ２１とを縮めて掘削機９を上行させ
、然る後、筒体４の推進用ジャッキ１０を伸長して筒体
４を下方へ推進する。次に、スラストジャッキ２１を伸
長し、中空回転軸１２を介して掘削機９を下降させ、伸
縮アーム２５を伸長しながら前記同様に掘削を行い、複
数本の推進ジャッキ１０が充分伸長すれば、その内の数
本のジャッキを縮めてスプレツダー１１を下降させ、ス
プレツダー１１と壁体３の下面との間に既製の壁体の一
部を設置する。この操作を繰り返して壁体３の全周を設
置すれば掘削作業の一サイクルを終了する。This muddy water adjusts the pressure inside the excavation chamber 8 by adjusting the amount of mud being sent and discharged and the head pressure, thereby preventing groundwater from flowing into the excavation chamber 8, heaping, etc., and discharging the excavated soil to the ground. The purpose is to Next, work floor 7
The thrust jack 21 provided on the lower surface of the excavator is extended to press the rotary shaft 12 downward, and the excavation heads 14, 14 are pressed downward via the excavation arm telescopic arm 25, and at that position,
The ground is excavated by the cutting blade 30 provided on the bottom surface of the excavating tool 32. When the thrust jack 21 is extended to a certain length, the jack 16 is operated to tighten the tightening band 17, and the jack 18 is operated to rotate the hollow rotating shaft 12 and rotate the excavation arm 13 in the horizontal direction. The rotating excavator 32 excavates the ground with the cutting blade 30 on the side while turning in the horizontal direction. Therefore, the excavation arm 13
are mounted eccentrically from the center of the hollow rotary shaft 12 by an appropriate dimension, so that one excavation head 14 excavates the center of the cylinder 4 and the other excavation head 14 excavates the peripheral part of the cylinder 4. In this way, jack 16 and jack 1
When the hollow rotary shaft 12 is rotated by the repeated operation of step 8 and the excavation arm 13 makes one revolution, the telescopic arm 25 is sequentially extended by the operation of the cylinder 24, and as shown in FIG. excavate the ground in the movement ranges 46 and 47, respectively. If a vertical hole with a depth equal to the total extension of the thrust jack 21 is excavated in this way, the excavation arm 25
and the thrust jack 21 are retracted to move the excavator 9 upward, and then the propulsion jack 10 of the cylindrical body 4 is extended to propel the cylindrical body 4 downward. Next, the thrust jack 21 is extended, the excavator 9 is lowered via the hollow rotating shaft 12, and excavation is performed in the same manner as described above while extending the telescoping arm 25. When the plurality of propulsion jacks 10 are fully extended, Some of the jacks are retracted to lower the spreader 11, and a part of the ready-made wall is installed between the spreader 11 and the lower surface of the wall 3. If this operation is repeated until the entire circumference of the wall 3 is installed, one cycle of the excavation work is completed.

上記一連の作業を繰り返すことにより、所定の深さの立
孔を掘削することができる。なお、上記作業において、
スラストジャッキ２１による推進、伸縮アーム２５の伸
縮、推進ジャッキ１０の伸縮は別個に行わず、連続して
行うことがてきる。By repeating the above series of operations, a vertical hole of a predetermined depth can be excavated. In addition, in the above work,
Propulsion by the thrust jack 21, extension and contraction of the telescoping arm 25, and extension and contraction of the propulsion jack 10 are not performed separately but can be performed continuously.

又、壁体３は既製のセグメントを使用しなくても、スラ
イデング型枠を壁体内面に設置し、筒体４が一定量下方
に推進する毎に型枠と筒体４及びスプレツダー１１によ
つて形成される空間にコンクリートを打設する逆打工法
によつて形成してもよい。さらに、本発明においては掘
削アーム１３が伸縮アームを介して伸縮するので立孔の
断面形状は円形に限定されることがなく総ゆる断面形状
の立孔の掘削に使用することができる。Moreover, the wall body 3 does not need to use ready-made segments, but a sliding formwork is installed on the inner surface of the wall body, and each time the cylinder body 4 is propelled downward by a certain amount, the formwork, the cylinder body 4, and the spretzer 11 are connected to each other. It may also be formed by a reverse pouring method, in which concrete is poured into the space formed by the concrete. Further, in the present invention, since the excavation arm 13 is extendable and retractable via the telescopic arm, the cross-sectional shape of the vertical hole is not limited to a circular shape, and the vertical hole can be used to excavate vertical holes with any cross-sectional shape.

上述のように本発明は、立孔を掘削すべき地盤に立て込
んだ所望の！ＩＪｌ面形状を有する筒体の内周面下端部
に固着した底床盤の中心部に中空回転軸を上下動自在に
貫通させ、該中空回転軸の下端部に、水平方向の掘削ア
ームを、該アームの中心か中空回転軸の中心より適宜寸
法だけ偏心するようにして取り付けると共に、掘削アー
ムに設けた伸縮機構を介して、その両端部に夫々独立し
て回転する掘削ヘッドを取り付け、さらに該掘削ヘッド
内に排泥管を突出させると共に該排泥管を地上に導出し
てなる立孔掘削装置に係るものであるから″掘削アーム
を伸縮アームを介して両端部の回転掘削ヘッドに接続し
たことによつて、伸縮アームの伸縮によつて様々な断面
形状の立孔の掘削か可能であると共に、掘削アームの固
定枠の端部に中空回転軸を取り付けて、固定枠の中心位
置を中空回転軸の中心より適宜寸法だけ偏心するように
したので、両端部の回転掘削ヘッドが同じ場所を重複し
て移動することがなく、２台の回転掘削ヘッドによつて
能率的に立孔の掘削を行うことができ、又掘削アームの
旋回と回転掘削ヘッドの駆動装置を別個にしているので
掘削装置の駆動機構を簡単で小さくすることかでき、従
つて掘削装置を軽量にし、掘削アームに過大なりか作用
することかない。As described above, the present invention provides a method for drilling a vertical hole into the ground to be excavated. A hollow rotary shaft is vertically movably passed through the center of the bottom plate fixed to the lower end of the inner peripheral surface of the cylinder having an IJl surface shape, and a horizontal excavation arm is attached to the lower end of the hollow rotary shaft. The center of the arm is mounted so as to be eccentric from the center of the hollow rotating shaft by an appropriate dimension, and a drilling head that rotates independently is mounted on both ends of the arm via a telescoping mechanism provided on the drilling arm. Since this is a vertical hole drilling device in which a sludge drainage pipe is protruded into the drilling head and the sludge drainage pipe is led out to the ground, the drilling arm is connected to the rotating drilling head at both ends via telescopic arms. By extending and contracting the telescopic arm, it is possible to excavate vertical holes with various cross-sectional shapes, and by attaching a hollow rotating shaft to the end of the fixed frame of the excavating arm, the center position of the fixed frame can be made hollow. Since the rotary shaft is eccentric by an appropriate amount from the center, the rotary drilling heads at both ends do not move over the same location, allowing the two rotary drilling heads to efficiently drill vertical holes. In addition, since the driving device for the rotation of the drilling arm and the driving device for the rotary drilling head are separate, the driving mechanism of the drilling rig can be made simple and small. It doesn't really work.

さらに掘削ヘッドに排泥管を設けて内部の土砂を排出す
るようにし、土砂か泥水中に浮遊しないようにしたので
、掘削終了後にスライムの処理を必要としない等の特徴
を有するものである。又、本発明においては筒体内で立
孔の壁体を形成するので立孔の深さに制約を受けること
かない。Furthermore, the excavation head is equipped with a sludge drain pipe to discharge the internal dirt so that the sludge does not float in the muddy water, so it has features such as no need to dispose of slime after excavation is completed. Further, in the present invention, since the wall of the vertical hole is formed within the cylindrical body, there is no restriction on the depth of the vertical hole.

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

図面は本発明の実施例を示すものて、第１図は全体の簡
略縦断面図、第２図は中空回転軸の回転機構を示する要
部の拡大平面図、第３図は中空回転軸部の一部を切断し
た拡大側面図、第４図は掘削アーム部分の拡大平面断面
図、第５図は第４図において伸縮アームを伸長した状態
を示す平面図第６図は第５図における平面図、第７図は
回転掘削ヘッドの拡大縦断側面図、第８図はその平面図
、第９図は掘削状態を示す平面図である。 １・・・・・・地盤、２・・・・・・立孔、３・・・・
・・壁体、４・・・筒体、６・・・・・・底床盤、７・
・・・・・作業床、１２・・・・・・中空回転軸、１３
・・・・・・掘削アーム、１４・・・・・回転掘削ヘッ
ド、２５・・・・・・伸縮アーム、３３・・・・・排泥
管。The drawings show an embodiment of the present invention, and FIG. 1 is a simplified vertical cross-sectional view of the whole, FIG. 2 is an enlarged plan view of the main part showing the rotation mechanism of the hollow rotating shaft, and FIG. 3 is the hollow rotating shaft. FIG. 4 is an enlarged plan sectional view of the excavation arm section, and FIG. 5 is a plan view showing the extendable state of the telescopic arm in FIG. 4. FIG. FIG. 7 is an enlarged vertical sectional side view of the rotary excavation head, FIG. 8 is a plan view thereof, and FIG. 9 is a plan view showing the excavation state. 1...Ground, 2...Vertical hole, 3...
... Wall body, 4 ... Cylindrical body, 6 ... Bottom floor board, 7.
...Working floor, 12...Hollow rotating shaft, 13
...Drilling arm, 14...Rotating excavation head, 25...Telescopic arm, 33...Sludge removal pipe.

Claims (1)

【特許請求の範囲】[Claims] １ 立孔を掘削すべき地盤に立て込んだ所望の断面形状
を有する筒体の内周面下部に底床盤を固着し、この底床
盤に処理水貯溜タンクに連通した送泥管の下端部を貫通
、開口させると共に底床盤の中心部に中空回転軸を上下
進退自在に貫通させ、該中空回転軸の下端部に水平方向
の掘削アームを、該アームの中心が中空回転軸の中心よ
り適宜寸法だけ偏心するようにして取り付けると共に、
掘削アームに設けた伸縮機構を介して、その両端部に土
砂を内部に取り込むスリットを有する掘削ヘッドを夫々
独立して回転可能に取付け、さらに、該掘削ヘッド内に
排泥管の下端部を臨ませると共にこの排泥管を地上の泥
水処理装置にまで導出したことを特徴とする立孔掘削装
置。1. A bottom plate is fixed to the lower part of the inner peripheral surface of a cylindrical body having a desired cross-sectional shape, which is built into the ground where a vertical hole is to be excavated, and the lower end of the mud pipe connected to the treated water storage tank is attached to the bottom plate. At the same time, a hollow rotating shaft is passed through the center of the bottom plate so that it can move up and down, and a horizontal excavation arm is installed at the lower end of the hollow rotating shaft, so that the center of the arm is above the center of the hollow rotating shaft. Install it so that it is eccentric by the appropriate dimension, and
Through a telescoping mechanism provided on the excavation arm, excavation heads having slits at both ends of the excavation arm for taking in earth and sand are attached to be rotatable independently, and the lower end of the mud removal pipe is attached inside the excavation head. A vertical hole drilling device characterized in that the sludge drainage pipe is led out to an above-ground muddy water treatment device.