JP2001115766A - Excavation drill - Google Patents
Excavation drillInfo
- Publication number
- JP2001115766A JP2001115766A JP30039199A JP30039199A JP2001115766A JP 2001115766 A JP2001115766 A JP 2001115766A JP 30039199 A JP30039199 A JP 30039199A JP 30039199 A JP30039199 A JP 30039199A JP 2001115766 A JP2001115766 A JP 2001115766A
- Authority
- JP
- Japan
- Prior art keywords
- bit
- groove
- pipe
- inner bit
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Earth Drilling (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は土木・建設工事にお
いて地盤・地山を水平・垂直・斜めに掘削するための掘
削ドリルであって、掘削した土砂・岩石片を水等の液体
を注入して排出させるための掘削ドリルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill for digging a ground or a ground horizontally, vertically or diagonally in civil engineering and construction work. Drilling drill for discharging.
【０００２】[0002]
【従来の技術】従来、地盤・地山を掘削し、掘削された
土砂・岩石片を強制注入された水とともに排出する掘削
ドリルとしては、二重管の内外管の下端に環状アウター
ビットとインナービットを取付け、内管内部を介して水
を注入し、注入した水と掘削土砂・岩石片等とを混合し
て内外管の間の空間を介して地上側へ排出する二重管構
造の掘削ドリルが使用されている。本出願人はインナー
ロッドで環状ビットを回動させ、回転駆動を簡略化した
構造のものを開発した。従来のこれらの掘削ドリルにお
けるビット表面から内外管の間の排泥路までの通路は、
インナービットの底面に複数のバイトが突出しているの
で、各バイト間の屈折・屈曲した間隙、又はビットに設
けた折曲した溝・中空路であったため、排泥の抵抗が大
きく排泥効率が悪いものであった。2. Description of the Related Art Conventionally, as a drill for excavating ground and ground and discharging excavated earth and sand pieces together with forced water, an annular outer bit and an inner Excavation of a double pipe structure in which a bit is attached, water is injected through the inside of the inner pipe, the injected water is mixed with excavated earth and sand, rock pieces, etc., and discharged to the ground side through the space between the inner and outer pipes Drills are used. The present applicant has developed a structure in which the annular bit is rotated by the inner rod and the rotational drive is simplified. In these conventional drills, the path from the bit surface to the muddy passage between the inner and outer pipes is
Since multiple bits protrude from the bottom surface of the inner bit, it was a bent / bent gap between each bit, or a bent groove / hollow path provided in the bit. It was bad.
【０００３】[0003]
【発明が解決しようとする課題】本発明が解決しようと
する課題は、従来のこれらの問題点を解消し、排泥能力
がきわめて高い掘削ドリルを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to solve the conventional problems and to provide a drilling drill having an extremely high sludge discharging ability.
【０００４】[0004]
【課題を解決するための手段】かかる課題を解決した本
発明の構成は、 １） 外管内に内管をその間に排泥路の空間が形成され
るように挿入した二重管構造の外管の下端に環状アウタ
ービットを回転自在に取付け、内管の下端にインナービ
ットを取付け、インナービットと環状アウタービットと
を回転方向に係止し、内管の内部を介して液体を送って
インナービットの開口から噴出し、掘削土と液体とを上
記排泥路を介して上昇させて排出できるようにした掘削
ドリルに於いて、インナービットの外周に管長手方向に
伸びた巾広で深い溝部を複数条放射状に設け、しかも同
溝部の下部中間の溝巾を円周方向に拡巾し、環状アウタ
ービットの内周にインナービットの溝部に挿入できる段
部を設け、インナービットの段部を溝部の下部中間に挿
入し、一方向に回転させてインナービットの拡巾した溝
部分に環状ビットの段部を係止させ、ビット同士を係止
させてインナービットを回転させる掘削状態においてイ
ンナービットの溝部が掘削地に対し略直角に中空状態で
臨んで円滑に排泥できることを特徴とする掘削ドリル ２） インナービットの溝部の溝巾の合計がそのインナ
ービット円周の３０〜７０％を占めるようにした前記
１）記載の掘削ドリル ３） インナービットの液体の開口がインナービットの
底面より上方の溝部表面に設けられた前記１）又は２）
記載の掘削ドリル ４） 溝部が３つあり、インナービットの下端に細長の
掘削刃を３本放射状に設けた前記１）〜３）何れか記載
の掘削ドリル ５） インナービットと内管とが螺合で脱着自在に取付
けられた前記１）〜４）何れか記載の掘削ドリルにあ
る。Means for Solving the Problems The structure of the present invention which has solved the above problems is as follows: 1) An outer pipe having a double pipe structure in which an inner pipe is inserted into an outer pipe so as to form a space for a muddy passage therebetween. Attach the outer bit to the lower end of the inner pipe rotatably, attach the inner bit to the lower end of the inner pipe, lock the inner bit and the outer bit in the rotation direction, and send the liquid through the inner pipe to the inner bit. In an excavation drill capable of discharging the excavated soil and liquid by raising the excavated soil and liquid through the above-mentioned mud path, a wide and deep groove extending in the pipe longitudinal direction is provided on the outer periphery of the inner bit. A plurality of radially provided, and the width of the lower middle groove of the groove portion is widened in the circumferential direction, and a step portion which can be inserted into the groove portion of the inner bit is provided on the inner periphery of the annular outer bit, and the step portion of the inner bit is formed as a groove portion. Inserted in the lower middle of Rotate in one direction to lock the stepped portion of the annular bit in the widened groove of the inner bit, lock the bits together and rotate the inner bit. A drilling drill characterized by being able to smoothly discharge sludge while facing in a hollow state at a substantially right angle. 2) The above 1), wherein the total width of the grooves of the inner bit occupies 30 to 70% of the circumference of the inner bit. 3) The above 1) or 2) wherein the opening of the liquid of the inner bit is provided on the surface of the groove above the bottom surface of the inner bit.
The drilling drill according to any one of the above 1) to 3), wherein the inner bit and the inner pipe are screwed. 3) The drill has three grooves, and three elongated drilling blades are radially provided at the lower end of the inner bit. The drill according to any one of 1) to 4) above, which is detachably attached to the drill.
【０００５】[0005]
【作用】本発明では、環状アウタービットの内周の段部
をインナービットの巾広で深い縦の溝部に挿入し、更に
同段部を溝部の下部中間の拡巾部分にインナービット又
はアウタービットを回転して挿入し、段部を溝部の拡巾
部分の上下壁で挟み、又段部を拡巾部分の側壁面で回転
方向に係止する。この状態でインナービットを地表側の
回動装置（図示せず）で回転させると、上記係止でアウ
タービットも回転し、インナービットとアウタービット
で地盤を掘削する。一方掘削中は、内管内部及びインナ
ービット内部を介して水を送り、そのインナービットの
開口から水を噴出し、インナービット，アウタービット
で掘削された土砂・岩石片・切粉を水とともに混合して
溝部を通り内外間中の排泥路を介して上方へ排出させ
る。このとき、溝部は巾広く、深さがあり、しかも挿入
した段部は拡巾部分へ移動するので溝部は地盤に略直角
に臨み且つ管長手方向にまっすぐに延びた中空空間とな
っているので抵抗が少なく排泥力が高い。According to the present invention, the step of the inner periphery of the annular outer bit is inserted into the wide and deep vertical groove of the inner bit, and the same step is inserted into the wide middle part of the lower part of the groove. Is rotated and inserted, the step is sandwiched between the upper and lower walls of the widened portion of the groove, and the step is locked in the rotating direction by the side wall surface of the widened portion. When the inner bit is rotated by a rotation device (not shown) on the ground side in this state, the outer bit is also rotated by the above-described locking, and the ground is excavated by the inner bit and the outer bit. On the other hand, during excavation, water is sent through the inner pipe and the inner bit, and water is spouted from the opening of the inner bit, and the earth, sand, rock pieces and cuttings excavated with the inner bit and outer bit are mixed with water Then, it is discharged upward through a drainage passage between the inside and the outside through the groove. At this time, the groove is wide and deep, and since the inserted step moves to the widened portion, the groove is a hollow space facing the ground substantially at right angles and extending straight in the pipe longitudinal direction. Low resistance and high drainage power.
【０００６】[0006]
【発明の実施の形態】本発明の溝部の溝巾の合計はその
円周の３０〜７０％（円周の長さに対する溝巾の合計の
長さの割合）を占めるようにするのが実用的で、３０％
より小さいと少し流路抵抗が大きく、７０％を超えると
強度・構造上の問題が複雑となり、３０〜７０％が実用
的で、３５〜６０％が好ましい。本発明における溝部の
巾の寸法は２ｃｍ，深さ２ｃｍ程が実用的で、内管の管
長手方向（上下方向）に垂直に設ける。又その下部の拡
巾部の長さとしては４ｃｍ程が実用的である。溝部は１
ｃｍ以上の巾と深さを有するのが通路抵抗が少ないので
好ましい。インナービット及び環状アウタービットの素
材は鉄鋼製又は鋳鉄製であり、その寸法は掘削の目的・
地盤等で異にするがアウタービットの外径で８〜３０ｃ
ｍ前後が一般的である。本発明のインナービットの下端
に設けるバイト（刃物）は、管の中心から半径方向に直
線的に延びた板状切削刃（超硬バイト）が切削・掘削効
果がよく、又溝部の下方開口を広くできるので好まし
い。本発明で、環状アウタ−ロッドは、外管の下端に回
転自在に取付け、インナーロッドの溝部とアウターロッ
ドの段部とを係止させてインナーロッドの回転でアウタ
ーロッドを回転させることが好ましい。BEST MODE FOR CARRYING OUT THE INVENTION It is practical that the total groove width of the groove portion of the present invention occupies 30 to 70% of the circumference (the ratio of the total length of the groove width to the length of the circumference). 30%
If it is smaller, the flow path resistance is slightly larger, and if it exceeds 70%, problems in strength and structure become complicated, 30 to 70% is practical, and 35 to 60% is preferable. In the present invention, the width of the groove is practically about 2 cm and the depth is about 2 cm, and the groove is provided perpendicular to the longitudinal direction (up-down direction) of the inner tube. Further, the length of the widened portion at the lower portion is practically about 4 cm. The groove is 1
It is preferable to have a width and a depth of not less than cm since the passage resistance is small. The material of the inner bit and the annular outer bit is made of steel or cast iron.
8 to 30c depending on the outer diameter of the outer bit
m is common. As the cutting tool (blade) provided at the lower end of the inner bit of the present invention, a plate-shaped cutting blade (carbide cutting tool) linearly extending in the radial direction from the center of the pipe has a good cutting and digging effect, and the lower opening of the groove is formed. It is preferable because it can be widened. In the present invention, it is preferable that the annular outer rod is rotatably attached to the lower end of the outer tube, and the outer rod is rotated by the rotation of the inner rod by locking the groove of the inner rod and the step of the outer rod.
【０００７】[0007]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。本実施例は、アウタービット外径は１２ｃｍ程で
あり、インナービットは内管の下端と螺着して脱着自在
であり、インナービットの液体の噴出の開口はインナー
ビットの下端より４ｃｍ以上高い所にあって、溝部に設
けられている。又、インナービットの垂直（管長手方
向）に延びた溝部の巾は２．２〜４ｃｍ（深さの位置で
巾を異にする）で、深さ２ｃｍ程であり、インナービッ
トの外周に溝部を３個設けている。インナーロッドの下
端は「Ｙ」字状になって半径方向に延びた部分に超硬製
の板状のバイトが取付けられている。又溝部は３条設け
られ、溝部の巾合計３ｌの円周長３Ｌに対する比率は３
８％程である。図１は、実施例の縦断面図である。図２
は、実施例の正面図である。図３は、図１のＡ−Ａ断面
図である。図４は、図１のＢ−Ｂ断面図である。図５
は、実施例の削孔時の底面図である。図６は、実施例の
インナービット回収時の底面図である。図７は、実施例
の削孔状態を示す説明図である。図８は、実施例のイン
ナービット回収状態を示す説明図である。図中、１は外
管、２は内管、２ａは内管２内部の通水路、２ｂはイン
ナービット５との螺合の為のねじ部、３は外管１と内管
２の間の排泥路、４は外管１の下端に回転自在に取付け
た環状アウタービット、４ａは同アウタービットの下端
に取付けた細長の掘削刃、４ｂはアウタービット４の内
面３個所に設けた３ｃｍ横巾，縦巾１．６ｃｍ程で突出
高さ１．２ｃｍ程の段部、５は内管の下端に螺着された
インナービット、５ａは同インナービットの外周に１２
０°隔てて垂直方向に設けられた３つの縦の溝部であっ
て、巾２．２〜４ｃｍ（溝は半径方向に拡がり、深さの
位置で巾長さは変化している。）、高さ２ｃｍの寸法を
有する。５ｂは同溝部の下部中間に設けた横に２．４ｃ
ｍ程、縦巾２．８ｃｍ程の拡巾部、５ｃはインナービッ
ト５の下端に１２０°角度隔ててＹ字状に配置された板
状の超硬金属製の板状の掘削刃でインナーロッドの下部
にその下端の三角形状下端部分が露出するように埋設さ
れている。５ｄは内管２との螺合部、５ｅはインナービ
ット５内部に設けた通水路、５ｆは同通水路の終路端の
開口であって、溝部５ａの底面に設けられている。５ｇ
はインナービット５の外周中間に設けた一時貯泥空間で
溝部５と連通している。この実施例では、掘削するとき
は、インナービット５を回転させ、アウタービット４の
段部４ｂが溝部５ａの拡巾部５ｂに挿入させ、回転方向
に対して拡巾部５ｂの側面と段部５ｂの側面とを当接さ
せて係止状態とし、又拡巾部５ｂの上下面で段部５ｂを
上下方向に拘束する。この状態で内管２に地上の回動装
置及び打撃装置（いずれも図示せず）によってビット同
士が係止する方向の回転と打撃・押圧を与えると、イン
ナービット５が回転するとともにアウタービット４も回
転し、その下端の掘削刃４ａ，５ｃで地盤を掘削する。
又同時に地上側の送水装置によって水を内管２の内の通
水路２ａ及びインナービット５の通水路５ｅを開いて送
り込み、インナービット５の下端より５ｃｍ上方の溝部
５の表面に設けた開口５ｆから噴水する。開口５ｆから
の噴水はかなりの部分がアウタービット４の内面に当た
って下方へ流れ出して、掘削された土砂・切粉・岩石片
と混合して泥状となって溝部５ａを通って内外管の間の
排泥路３へ流入する。開口５ｆの一部はアウタービット
４の内周面に当たって直接溝部５ａへ上昇する。一部は
開口５ｆからそのまま上昇して排泥路３に流れて吸引効
果を発生させる。このとき、３条の各溝部５ａは掘削す
る切羽面に対して略直角に臨み、大略３ｃｍ×２ｃｍ程
の通路面積でまっすぐ垂直（縦方向，管長手方向）の中
空の通路となっているので（溝部の巾の合計の円周に対
する比率で３８％程度で）、流路抵抗が少なく、大きめ
の破砕片・砂でも円滑に上昇できる。この掘削時におい
て外管１は回転させず地盤の中に静止し、掘削孔の崩壊
を防ぎ、排泥路３を確保している。掘削した後、内管２
を上記と逆方向に少し回転させ、アウタービット４の段
部４ｂを溝部５ａ内に置く。その後内管２を上昇させる
と、インナービット５はアウタービット４と係止するこ
となく、段部４ｂは溝部５ａを通過して地上側へ引き上
げられる。これによって、高価なインナービット５を掘
削孔から引き上げて再使用することができるようにす
る。外管１の方は地盤中に残し、グラウトセメントミル
ク・コンクリート等を掘削孔内に流し込んで地中杭とな
す。Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the outer diameter of the outer bit is about 12 cm, the inner bit is screwed to and detachable from the lower end of the inner tube, and the opening of the liquid jet of the inner bit is at least 4 cm higher than the lower end of the inner bit. And provided in the groove. The width of the groove extending vertically (in the longitudinal direction of the pipe) of the inner bit is 2.2 to 4 cm (the width differs at the position of the depth), and is about 2 cm in depth. Are provided. The lower end of the inner rod is formed in a “Y” shape and a portion extending in the radial direction is provided with a carbide plate-shaped cutting tool. Also, three grooves are provided, and the ratio of the total width of the groove to the circumferential length of 3L is 3L.
It is about 8%. FIG. 1 is a longitudinal sectional view of the embodiment. FIG.
FIG. 2 is a front view of the embodiment. FIG. 3 is a sectional view taken along line AA of FIG. FIG. 4 is a sectional view taken along line BB of FIG. FIG.
FIG. 4 is a bottom view at the time of drilling of the embodiment. FIG. 6 is a bottom view of the embodiment when the inner bit is collected. FIG. 7 is an explanatory diagram illustrating a drilling state according to the embodiment. FIG. 8 is an explanatory diagram illustrating an inner bit collection state according to the embodiment. In the drawing, 1 is an outer pipe, 2 is an inner pipe, 2a is a water passage inside the inner pipe 2, 2b is a screw portion for screwing with the inner bit 5, and 3 is a part between the outer pipe 1 and the inner pipe 2. The sludge passage, 4 is an annular outer bit rotatably attached to the lower end of the outer pipe 1, 4 a is an elongated excavating blade attached to the lower end of the outer bit, 4 b is a 3 cm side provided at three places on the inner surface of the outer bit 4. A step portion having a width and height of about 1.6 cm and a protruding height of about 1.2 cm, 5 is an inner bit screwed to the lower end of the inner pipe, 5a is 12
Three vertical grooves provided in the vertical direction at a distance of 0 °, having a width of 2.2 to 4 cm (the grooves expand in the radial direction, and the width changes at the depth position), and the height is high. It has dimensions of 2 cm. 5b is a horizontal 2.4c provided at the lower middle of the groove.
m, a widened part having a vertical width of about 2.8 cm, and 5c is a plate-shaped excavating blade made of a cemented carbide metal which is disposed in a Y-shape at a lower end of the inner bit 5 at an angle of 120 ° and is an inner rod. Is buried in the lower part of the bottom so that the lower end of the triangle is exposed. 5d is a threaded portion with the inner pipe 2, 5e is a water passage provided inside the inner bit 5, 5f is an opening at the end of the water passage, and is provided on the bottom surface of the groove 5a. 5g
Is a temporary mud storage space provided in the middle of the outer periphery of the inner bit 5 and communicates with the groove 5. In this embodiment, when excavating, the inner bit 5 is rotated so that the step 4b of the outer bit 4 is inserted into the widened portion 5b of the groove 5a. The side surface of the step 5b is brought into contact with the side surface 5b so as to be locked, and the upper and lower surfaces of the widened portion 5b restrain the step 5b in the vertical direction. In this state, when the inner pipe 2 is rotated and hit / pressed in a direction in which the bits are locked by a turning device and a hitting device (neither is shown) on the ground, the inner bit 5 rotates and the outer bit 4 Also rotates, and the ground is excavated by the excavation blades 4a and 5c at the lower end.
At the same time, water is supplied by opening the water passage 2a of the inner pipe 2 and the water passage 5e of the inner bit 5 by the water supply device on the ground side, and the opening 5f provided on the surface of the groove 5 5 cm above the lower end of the inner bit 5. Fountain from A considerable part of the fountain from the opening 5f hits the inner surface of the outer bit 4 and flows downward, mixes with the excavated earth and sand, chips, and rock pieces, forms mud, and passes through the groove 5a between the inner and outer pipes. It flows into the mud drain 3. A part of the opening 5f hits the inner peripheral surface of the outer bit 4 and rises directly to the groove 5a. A part thereof rises as it is from the opening 5f and flows into the drainage passage 3 to generate a suction effect. At this time, each of the three grooves 5a faces substantially perpendicularly to the face to be excavated, and is a hollow passage that is straight and vertical (longitudinal direction, longitudinal direction of the pipe) with a passage area of approximately 3 cm × 2 cm. (The total width of the groove is about 38% of the total circumference), the flow path resistance is small, and even large crushed pieces and sand can be raised smoothly. At the time of this excavation, the outer pipe 1 does not rotate and stays in the ground to prevent collapse of the excavation hole, and secures the drainage passage 3. After excavation, inner pipe 2
Is rotated slightly in the opposite direction to that described above, and the step 4b of the outer bit 4 is placed in the groove 5a. Then, when the inner pipe 2 is raised, the inner bit 5 is not locked with the outer bit 4, and the step portion 4b passes through the groove portion 5a and is pulled up to the ground side. As a result, the expensive inner bit 5 can be lifted out of the borehole and reused. The outer pipe 1 is left in the ground, and grout cement milk / concrete is poured into the excavation hole to form an underground pile.
【０００８】[0008]
【発明の効果】以上の様に、本発明によれば管長手方向
に延びた巾広で深い溝部を設けたことによって、掘削し
た土砂・岩石片・切粉を液体とともに混合して内管と外
管の間の排泥路へ抵抗少なく効率的に移送でき、排泥効
率を高めることができる。溝部の巾の合計の円周に対す
る比率が３０〜７０％のときが実用的となる。インナー
ビットの下端の掘削刃が放射状に配置され且つ３本の細
長の形状であれば、溝部を巾広く且つ深く設けることが
容易となる。又インナービットの液体の噴出する開口を
インナービットの底面より上方の溝部に設けることで、
混合と排出が容易にできるようになる。As described above, according to the present invention, by providing a wide and deep groove extending in the longitudinal direction of the pipe, the excavated earth and sand, rock pieces, and chips are mixed with the liquid and mixed with the inner pipe. It can be efficiently transferred to the drainage passage between the outer pipes with little resistance, and the drainage efficiency can be increased. It is practical when the ratio of the total width of the groove to the circumference is 30 to 70%. If the excavating blades at the lower end of the inner bit are radially arranged and have three elongated shapes, it is easy to provide the groove part wide and deep. Also, by providing an opening for ejecting the liquid of the inner bit in the groove above the bottom surface of the inner bit,
Mixing and draining becomes easier.
【図１】実施例の縦断面図である。FIG. 1 is a longitudinal sectional view of an embodiment.
【図２】実施例の正面図である。FIG. 2 is a front view of the embodiment.
【図３】図１のＡ−Ａ断面図である。FIG. 3 is a sectional view taken along line AA of FIG. 1;
【図４】図１のＢ−Ｂ断面図である。FIG. 4 is a sectional view taken along line BB of FIG. 1;
【図５】実施例の削孔時の底面図である。FIG. 5 is a bottom view of the embodiment at the time of drilling.
【図６】実施例のインナービット回収時の底面図であ
る。FIG. 6 is a bottom view of the embodiment when the inner bit is collected.
【図７】実施例の削孔状態を示す説明図である。FIG. 7 is an explanatory view showing a drilling state of the embodiment.
【図８】実施例のインナービット回収状態を示す説明図
である。FIG. 8 is an explanatory diagram showing an inner bit collection state of the embodiment.
１ 外管 ２ 内管 ２ａ 通水路 ２ｂ ねじ部 ３ 排泥路 ４ アウタービット ４ａ 掘削刃 ４ｂ 段部 ５ インナービット ５ａ 溝部 ５ｂ 拡巾部 ５ｃ 掘削刃 ５ｄ 螺合部 ５ｅ 通水路 ５ｆ 開口 ５ｇ 一時貯泥空間 DESCRIPTION OF SYMBOLS 1 Outer pipe 2 Inner pipe 2a Water passage 2b Screw part 3 Drainage passage 4 Outer bit 4a Drilling blade 4b Step 5 Inner bit 5a Groove part 5b Widening part 5c Drilling blade 5d Threaded part 5e Water passage 5f Opening 5g Temporary storage space
Claims (5)
形成されるように挿入した二重管構造の外管の下端に環
状アウタービットを回転自在に取付け、内管の下端にイ
ンナービットを取付け、インナービットと環状アウター
ビットとを回転方向に係止し、内管の内部を介して液体
を送ってインナービットの開口から噴出し、掘削土と液
体とを上記排泥路を介して上昇させて排出できるように
した掘削ドリルに於いて、インナービットの外周に管長
手方向に伸びた巾広で深い溝部を複数条放射状に設け、
しかも同溝部の下部中間の溝巾を円周方向に拡巾し、環
状アウタービットの内周にインナービットの溝部に挿入
できる段部を設け、インナービットの段部を溝部の下部
中間に挿入し、一方向に回転させてインナービットの拡
巾した溝部分に環状ビットの段部を係止させ、ビット同
士を係止させてインナービットを回転させる掘削状態に
おいてインナービットの溝部が掘削地に対し略直角に中
空状態で臨んで円滑に排泥できることを特徴とする掘削
ドリル。1. An annular outer bit is rotatably attached to a lower end of an outer pipe having a double pipe structure in which an inner pipe is inserted into an outer pipe so as to form a space for a muddy passage therebetween. Attach the inner bit, lock the inner bit and the annular outer bit in the rotation direction, send the liquid through the inside of the inner pipe, squirt it from the opening of the inner bit, and remove the excavated soil and liquid In an excavation drill that can be raised and discharged through, a wide and deep groove extending in the pipe longitudinal direction is provided on the outer periphery of the inner bit in a plurality of radial lines,
In addition, the width of the groove at the lower middle of the groove is widened in the circumferential direction, and a step is provided on the inner periphery of the annular outer bit so that it can be inserted into the groove of the inner bit.The step of the inner bit is inserted into the lower middle of the groove. Rotate in one direction to lock the stepped portion of the annular bit in the widened groove of the inner bit, lock the bits together and rotate the inner bit. A drilling drill characterized by being able to smoothly discharge sludge by facing in a hollow state at a substantially right angle.
のインナービット円周の３０〜７０％を占めるようにし
た請求項１記載の掘削ドリル。2. The drill according to claim 1, wherein the total groove width of the groove of the inner bit occupies 30 to 70% of the circumference of the inner bit.
ビットの底面より上方の溝部表面に設けられた請求項１
又は２記載の掘削ドリル。3. The inner bit liquid opening is provided on a surface of the groove above the bottom surface of the inner bit.
Or the drilling drill according to 2.
に細長の掘削刃を３本放射状に設けた請求項１〜３何れ
か記載の掘削ドリル。4. The drilling drill according to claim 1, wherein there are three grooves, and three elongated drilling blades are radially provided at a lower end of the inner bit.
在に取付けられた請求項１〜４何れか記載の掘削ドリ
ル。5. The drilling drill according to claim 1, wherein the inner bit and the inner tube are detachably mounted by screwing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30039199A JP2001115766A (en) | 1999-10-22 | 1999-10-22 | Excavation drill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP30039199A JP2001115766A (en) | 1999-10-22 | 1999-10-22 | Excavation drill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001115766A true JP2001115766A (en) | 2001-04-24 |
Family
ID=17884228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP30039199A Pending JP2001115766A (en) | 1999-10-22 | 1999-10-22 | Excavation drill |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001115766A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008280710A (en) * | 2007-05-09 | 2008-11-20 | Mitsubishi Materials Corp | Excavator |
| JP2008297864A (en) * | 2007-06-04 | 2008-12-11 | Sekisui House Ltd | Construction method of cast-in-place pile |
| JP2010121275A (en) * | 2008-11-17 | 2010-06-03 | T F T:Kk | Double-pipe drilling unit |
| JP2011021411A (en) * | 2009-07-17 | 2011-02-03 | Toyomitsu Kogyo Kk | Double pipe drilling tool |
| JP2012026132A (en) * | 2010-07-22 | 2012-02-09 | Tookinooru:Kk | Excavation tool |
| JP2012031610A (en) * | 2010-07-29 | 2012-02-16 | Tft Co Ltd | Double tube type drilling unit |
-
1999
- 1999-10-22 JP JP30039199A patent/JP2001115766A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008280710A (en) * | 2007-05-09 | 2008-11-20 | Mitsubishi Materials Corp | Excavator |
| JP2008297864A (en) * | 2007-06-04 | 2008-12-11 | Sekisui House Ltd | Construction method of cast-in-place pile |
| JP2010121275A (en) * | 2008-11-17 | 2010-06-03 | T F T:Kk | Double-pipe drilling unit |
| JP2011021411A (en) * | 2009-07-17 | 2011-02-03 | Toyomitsu Kogyo Kk | Double pipe drilling tool |
| JP2012026132A (en) * | 2010-07-22 | 2012-02-09 | Tookinooru:Kk | Excavation tool |
| JP2012031610A (en) * | 2010-07-29 | 2012-02-16 | Tft Co Ltd | Double tube type drilling unit |
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