JPS627745Y2 - - Google Patents
Info
- Publication number
- JPS627745Y2 JPS627745Y2 JP17028180U JP17028180U JPS627745Y2 JP S627745 Y2 JPS627745 Y2 JP S627745Y2 JP 17028180 U JP17028180 U JP 17028180U JP 17028180 U JP17028180 U JP 17028180U JP S627745 Y2 JPS627745 Y2 JP S627745Y2
- Authority
- JP
- Japan
- Prior art keywords
- earth
- sand
- cutter
- suction port
- auxiliary
- 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.)
- Expired
Links
- 239000004576 sand Substances 0.000 claims description 36
- 238000009412 basement excavation Methods 0.000 claims description 23
- 239000002689 soil Substances 0.000 claims description 15
- 238000005553 drilling Methods 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Description
【考案の詳細な説明】
本考案は、レバースサーキユレーシヨンドリル
工法またはアースオーガ工法等において使用され
る竪穴掘削用ビツトに関する。[Detailed Description of the Invention] The present invention relates to a pit drilling bit used in the reverse circulation drilling method or the earth auger method.
第１図及び第２図は竪穴掘削用ビツトの一つで
ある三翼ビツトの従来例を示し、１は掘削回転軸
を兼ねた排土管で、その下端には土砂吸込口１ａ
が設けられている。２は排土管１に放射状に設け
られた三枚の翼で、各翼２は夫々120度ずつ角位
相を異にし、かつ上反角とすくい角とをもつて排
土管１の下部に固着されている。そして各翼２の
下面には複数個の切削カツタ３が固着されてい
る。４は排土管１の下端に固着されたヘツドカツ
タで、その下部の回転掘削方向側前面には切削刃
４ａが設けられていると共に、中央には掘削土砂
の塊を排土管１の主の土砂吸込口１ａへ円滑に導
くための通過孔４ｂが形成されている。また、ヘ
ツドカツタ４は回転掘削方向に対して略直立して
取付けられており、切削刃４ａのすくい角は０〜
５度程度である。 Figures 1 and 2 show a conventional example of a three-winged bit, which is one of the bits for pit excavation. 1 is an earth removal pipe that also serves as an excavation rotation axis, and the lower end has an earth and sand suction port 1a.
is provided. Reference numeral 2 denotes three blades provided radially on the earth removal pipe 1. Each blade 2 has an angular phase difference of 120 degrees, and is fixed to the lower part of the earth removal pipe 1 with a dihedral angle and a rake angle. ing. A plurality of cutting cutters 3 are fixed to the lower surface of each blade 2. Reference numeral 4 denotes a head cutter fixed to the lower end of the earth removal pipe 1, and a cutting blade 4a is provided on the front surface of the lower part in the rotating excavation direction. A passage hole 4b is formed to smoothly guide the material to the mouth 1a. Further, the head cutter 4 is installed substantially upright with respect to the rotary excavation direction, and the rake angle of the cutting blade 4a is 0 to 0.
It is about 5 degrees.
前記の三翼ビツトは、排土管１及び翼２の回転
により、第３図及び第４図に示す如く翼２の下方
の地盤は各翼２の切削カツタ３にて掘削され、か
つ排土管１直下の地盤はヘツドカツタ４にて掘削
される。そして掘削土砂は水と共に排土管１の吸
込口１ａから直接管１内に吸込まれ、また一部の
掘削土砂はヘツドカツタ４の通過孔４ｂを通過し
て排土管１内に吸込まれていく。 In the three-winged bit, as shown in FIGS. 3 and 4, the ground below the blades 2 is excavated by the cutting cutters 3 of each blade 2 due to the rotation of the earth removal pipe 1 and the blades 2, and the soil removal pipe 1 is rotated. The ground directly below will be excavated with head cutter 4. The excavated earth and sand are sucked directly into the earth discharge pipe 1 from the suction port 1a of the earth discharge pipe 1 together with water, and some of the excavated earth and sand passes through the passage hole 4b of the head cutter 4 and is sucked into the earth earth earth earth discharge pipe 1.
尚、第３図において、Ｂは翼２に付着した土砂
を示す。 In addition, in FIG. 3, B indicates earth and sand attached to the blade 2.
しかるに、従来の三翼ビツトにおいては、掘削
する地盤の粘性度が高くなるに従いヘツドカツタ
４にて掘削された土砂Ａが該ヘツドカツタ４の刃
先からヘツドカツタ本体前面に圧密付着し掘削の
回転が進むにつれてその土量が増していく。そし
て、この土砂は掘削下降（掘進するためビツト全
体を下方へ降す）する回転初期時にはヘツドカツ
タ本体全面の前方側にたまり、徐々に上方（排土
管１の吸込口１ａ側）へ移動し、最悪の時には第
５図に示す如くヘツドカツタ４の刃先から排土管
１の吸込口１ａまでに亘つてたまり、該吸込口１
ａを閉塞してしまう。このような状態は吸込口１
ａでの大きな吸込抵抗となり、掘削土砂の吸込能
率を低下させ、掘削、排土を連続して行う掘進能
率の極度の低下を招く。また吸込口１ａの閉塞状
態によつては掘削土砂の吸込みが不可能となり、
一時掘削作業を中断してビツト全体を掘削穴底か
ら引き上げて詰つた土砂を取り除かなければなら
なくなる。 However, in the conventional three-winged bit, as the viscosity of the ground to be excavated increases, the soil A excavated by the head cutter 4 adheres compactly from the cutting edge of the head cutter 4 to the front surface of the head cutter body, and as the rotation of excavation progresses, the soil A is The amount of soil is increasing. At the beginning of the rotation when the excavation is descending (the entire bit is lowered downward to dig), this earth and sand accumulates on the front side of the entire head cutter body, gradually moves upward (to the suction port 1a side of the earth removal pipe 1), and in the worst case, At this time, as shown in FIG.
It blocks a. In this situation, the suction port 1
This results in a large suction resistance at point a, lowering the suction efficiency of the excavated soil, and causing an extreme decrease in the excavation efficiency when excavating and discharging soil are performed continuously. In addition, depending on the blocked state of the suction port 1a, it becomes impossible to suck in the excavated soil.
It becomes necessary to temporarily stop the excavation work and pull up the entire bit from the bottom of the excavation hole to remove the clogged earth and sand.
本考案は、前述した従来技術に鑑み、ヘツドカ
ツタにて掘削された土砂の全部が該ヘツドカツタ
の前面にたまらないようにして、排土管の吸込口
での吸込抵抗の増加の防止及び吸込口の閉塞の防
止を行える竪穴掘削用ビツトを提供することを目
的とするものである。 In view of the prior art described above, the present invention prevents all of the earth and sand excavated by the head cutter from accumulating on the front surface of the head cutter, thereby preventing an increase in suction resistance at the suction port of the earth removal pipe and preventing blockage of the suction port. The object of the present invention is to provide a pit drilling bit that can prevent the occurrence of damage.
この目的を達成するために、本考案は下端に土
砂吸込口を有する回転可能な排土管と、排土管の
下部に上反角とすくい角とをもつて放射状に固設
された複数の翼と、各翼に取付けられた複数個の
切削カツタと、前記排土管の下端に固設され、か
つ中央部に土砂通過孔を有するヘツドカツタとを
備えた竪穴掘削用ビツトにおいて、前記ヘツドカ
ツタの両側部に、適宜のすくい角をもつ刃先を有
し、かつ該刃先の上部に掘削土砂の移動案内面を
有した補助カツタを固設し、前記排土管の吸込口
の周縁に半円状をなす補助の土砂吸込口を設け、
前記補助カツタは、その掘削土砂移動案内面がヘ
ツドカツタ本体の掘削方向前面に対して15度ない
し75度の角度をなして取付けられ、前記補助の土
砂吸込口の周壁には、土砂を切断しうる刃部が形
成されていることを特徴とするものである。 To achieve this purpose, the present invention includes a rotatable soil removal pipe having a soil suction port at its lower end, and a plurality of radially fixed blades having dihedral angles and rake angles at the bottom of the soil removal pipe. , a pit drilling bit comprising a plurality of cutting cutters attached to each wing, and a head cutter fixedly installed at the lower end of the earth removal pipe and having an earth and sand passage hole in the center, wherein both sides of the head cutter , an auxiliary cutter having a cutting edge with an appropriate rake angle and a movement guide surface for excavated earth and sand is fixed on the upper part of the cutting edge, and a semicircular auxiliary cutter is attached to the periphery of the suction port of the earth removal pipe. Install a sediment suction port,
The auxiliary cutter is installed with its excavation earth movement guide surface forming an angle of 15 to 75 degrees with respect to the front surface of the head cutter main body in the excavation direction, and the peripheral wall of the auxiliary earth and sand suction port has a section capable of cutting earth and sand. It is characterized by having a blade portion formed therein.
以下、本考案の詳細を図面に従つて説明する。
第６図は本考案による三翼ビツトの正面図、第７
図は第６図の−矢視図である。図において、
第１図及び第２図と同一符号のものは同じもの、
もしくは相当するものを示している。ヘツドカツ
タ４の本体両側部には、補助カツタ５が固設され
ている。また排土管１の吸込口１ａ周縁には、半
円状をなす補助の土砂吸込口１ｂがヘツドカツタ
４を挾んで対向して設けられている。 The details of the present invention will be explained below with reference to the drawings.
Figure 6 is a front view of the three-winged bit according to the present invention;
The figure is a view taken along the - arrow in FIG. In the figure,
Items with the same numbers as in Figures 1 and 2 are the same.
Or something equivalent is shown. Auxiliary cutters 5 are fixed to both sides of the main body of the head cutter 4. Further, on the periphery of the suction port 1a of the earth discharge pipe 1, an auxiliary earth and sand suction port 1b having a semicircular shape is provided opposite to the head cutter 4 with the head cutter 4 in between.
前記補助カツタ５は、第８図に示す如く適宜の
すくい角αをもつ刃先５ａと、刃先５ａの上部に
適宜長さβの掘削土砂移動案内面５ｂとを有して
いる。そして補助カツタ５は、その掘削土砂移動
案内面５ｂがヘツドカツタ４の本体の掘削方向前
面に対して15度ないし75度の範囲の角度δをなし
て取付けられている。尚、図中γはヘツドカツタ
４の掘削逃げ角、γ′は補助カツタ５の掘削逃げ
角を示す。 As shown in FIG. 8, the auxiliary cutter 5 has a cutting edge 5a having an appropriate rake angle α, and an excavated soil movement guide surface 5b having an appropriate length β above the cutting edge 5a. The auxiliary cutter 5 is attached so that its excavated soil movement guide surface 5b forms an angle δ in the range of 15 degrees to 75 degrees with respect to the front surface of the main body of the head cutter 4 in the excavation direction. In the figure, γ indicates the excavation clearance angle of the head cutter 4, and γ' indicates the excavation clearance angle of the auxiliary cutter 5.
前記補助の土砂吸込口１ｂは、その周壁内面に
第９図及び第１０図に示す如く２つのテーパ面
T1，T2から成る刃部が形成されている。尚、前
記刃部を、第１１図及び第１２図に示した如く一
つのテーパ面で形成してもよく、また第１３図に
示した如く凸曲面で形成してもよい。 The auxiliary earth and sand suction port 1b has two tapered surfaces on the inner surface of its peripheral wall as shown in FIGS. 9 and 10.
A blade portion consisting of T 1 and T 2 is formed. The blade portion may be formed with a single tapered surface as shown in FIGS. 11 and 12, or may be formed with a convex curved surface as shown in FIG. 13.
しかるに、本考案による三翼ビツトでは、掘削
回転時、第８図及び第１４図に示す如く補助カツ
タ５で掘削された土砂は該補助カツタ５の案内面
５ｂの角度δに沿つて矢印Ｃの流れでＤの如く補
助カツタ５の後方へ移動する。また掘削時はヘツ
ドカツタ４にて掘削された土砂と補助カツタ５に
て掘削された土砂とが移動途中で互に付着結合し
合い、補助カツタ５で掘削された土砂の移動方向
Ｃへ移動する。即ち、ヘツドカツタ４で掘削され
た土砂の一部が補助カツタ５で掘削された土砂へ
引き寄せられる。従つて、第１４図の如くヘツド
カツタ４の前面にたまる土砂A′の量が少なくな
つて、排土管１の吸込口１ａ側へ盛り上がること
はなくなる。 However, in the three-winged bit according to the present invention, during excavation rotation, the earth and sand excavated by the auxiliary cutter 5 moves along the angle δ of the guide surface 5b of the auxiliary cutter 5 as shown by the arrow C, as shown in FIGS. 8 and 14. Due to the flow, it moves to the rear of the auxiliary cutter 5 as shown in D. Further, during excavation, the earth and sand excavated by the head cutter 4 and the earth and sand excavated by the auxiliary cutter 5 adhere to each other during movement, and move in the movement direction C of the earth and sand excavated by the auxiliary cutter 5. That is, a part of the earth and sand excavated by the head cutter 4 is attracted to the earth and sand excavated by the auxiliary cutter 5. Therefore, as shown in FIG. 14, the amount of earth and sand A' that accumulates on the front surface of the head cutter 4 is reduced and does not bulge toward the suction port 1a of the earth discharge pipe 1.
また、前記土砂A′が第１５図に示す如く排土
管１の吸込口１ａ及び補助の吸込口１ｂまで盛り
上がつた場合、該土砂A′は補助吸込口１ｂの刃
部によつて切断される、つまり土砂A′を吸込口
方向へ移動させる力Ｅと排土管１外へ移動させる
力E′とが吸込方向に対して交差する方向に作用
することにより、土砂A′が切断される。従つ
て、土砂A′が吸込口で固着される状態とならな
い。 Further, when the earth and sand A' rises up to the suction port 1a and the auxiliary suction port 1b of the earth removal pipe 1 as shown in FIG. 15, the earth and sand A' is cut by the blade of the auxiliary suction port 1b. That is, the earth and sand A' is cut by the force E that moves the earth and sand A' toward the suction port and the force E' that moves the earth and sand A' out of the earth discharge pipe 1, acting in a direction crossing the suction direction. Therefore, the soil A' is not stuck at the suction port.
以上の如く補助カツタ５の作用と補助吸込口１
ｂの刃部の切断作用とにより、掘削土砂による吸
込口１ａでの吸込抵抗の増加が防止されると共
に、吸込口１ａの閉塞が防止される。 As described above, the action of the auxiliary cutter 5 and the auxiliary suction port 1
The cutting action of the blade portion b prevents an increase in the suction resistance at the suction port 1a due to excavated earth and sand, and also prevents the suction port 1a from being blocked.
尚、前記実施例では三翼ビツトについて示した
が、四翼ビツトにおいても前述と同様な作用、効
果を達成できることは勿論である。 In the above embodiment, a three-winged bit was shown, but it goes without saying that the same functions and effects as described above can be achieved with a four-winged bit.
以上説明したように、本考案によれば、掘削土
砂による吸込口での吸込抵抗の増加を防止できる
ことは勿論の他、吸込口の閉塞を防止でき、掘
削、排土による掘進能率の向上を図れる。 As explained above, according to the present invention, it is possible not only to prevent an increase in suction resistance at the suction port due to excavated earth and sand, but also to prevent the suction port from being blocked, thereby improving the excavation efficiency of excavation and earth removal. .
第１図は従来の三翼ビツトの正面図、第２図は
第１図の−矢視図、第３図は掘削状態を示す
正面図、第４図は第３図の−矢視図、第５図
はヘツドカツタ前面の土砂が排土管の吸込口まで
盛り上がつた状態の説明図、第６図は本考案によ
る三翼ビツトの正面図、第７図は第６図の−
矢視図、第８図は第６図における補助カツタの取
付状態並びに掘削状態の説明図、第９図は第６図
における排土管の補助吸込口の拡大図、第１０図
は第９図の−断面図、第１１図ないし第１３
図は補助吸込口の他の例を示す断面図、第１４図
及び第１５図は掘削時における排土管の吸込口付
近の土砂の状態を示す説明図である。
１……排土管、１ａ……吸込口、１ｂ……補助
の土砂吸込口、２……翼、３……切削カツタ、４
……ヘツドカツタ、４ｂ……土砂通過孔、５……
補助カツタ、５ａ……刃先、５ｂ……掘削土砂の
移動案内面、α……刃先のすくい角、δ……移動
案内面のヘツドカツタに対する角度。
Fig. 1 is a front view of a conventional three-winged bit, Fig. 2 is a view taken in the - direction of Fig. 1, Fig. 3 is a front view showing the excavation state, Fig. 4 is a - direction view of Fig. Fig. 5 is an explanatory diagram of the state in which the earth and sand in front of the head cutter has risen up to the suction port of the earth removal pipe, Fig. 6 is a front view of the three-winged bit according to the present invention, and Fig. 7 is the same as Fig. 6.
8 is an explanatory diagram of the installation state of the auxiliary cutter and the excavation state in FIG. 6, FIG. 9 is an enlarged view of the auxiliary suction port of the earth removal pipe in FIG. 6, and FIG. - Sectional views, Figures 11 to 13
The figure is a sectional view showing another example of the auxiliary suction port, and FIGS. 14 and 15 are explanatory diagrams showing the state of earth and sand near the suction port of the earth removal pipe during excavation. 1...Earth removal pipe, 1a...Suction port, 1b...Auxiliary earth and sand suction port, 2...Blade, 3...Cutting cutter, 4
...Headkatsuta, 4b... Sediment passage hole, 5...
Auxiliary cutter, 5a...Blade tip, 5b...Moving guide surface for excavated earth and sand, α...Rake angle of the cutting edge, δ...Angle of the moving guide surface with respect to the head cutter.
Claims (1)
と、排土管の下部に上反角とすくい角とをもつて
放射状に固設された複数の翼と、各翼に取付けら
れた複数個の切削カツタと、前記排土管の下端に
固設され、かつ中央部に土砂通過孔を有するヘツ
ドカツタとを備えた竪穴掘削用ビツトにおいて、
前記ヘツドカツタの両側部に、適宜のすくい角を
もつ刃先を有し、かつ該刃先の上部に掘削土砂の
移動案内面を有した補助カツタを固設し、前記排
土管の吸込口の周縁に半円状をなす補助の土砂吸
込口を設け、前記補助カツタは、その掘削土砂移
動案内面がヘツドカツタ本体の掘削方向前面に対
して15度ないし75度の角度をなして取付けられ、
前記補助の土砂吸込口の周壁には、土砂を切断し
うる刃部が形成されていることを特徴とする竪穴
掘削用ビツト。 A rotatable earth removal pipe with a soil suction port at the lower end, a plurality of blades fixed radially at the bottom of the earth removal pipe with a dihedral angle and a rake angle, and a plurality of cutting pieces attached to each blade. A pit excavation bit comprising a cutter and a head cutter fixed to the lower end of the earth discharge pipe and having an earth and sand passage hole in the center,
An auxiliary cutter is fixed on both sides of the head cutter, and has a cutting edge with an appropriate rake angle, and a guide surface for moving excavated soil on the upper part of the cutting edge. An auxiliary earth and sand suction port having a circular shape is provided, and the auxiliary cutter is installed such that its excavated earth and sand movement guide surface forms an angle of 15 degrees to 75 degrees with respect to the front surface of the head cutter body in the excavation direction,
A pit drilling bit characterized in that a blade portion capable of cutting earth and sand is formed on a peripheral wall of the auxiliary earth and sand suction port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17028180U JPS627745Y2 (en) | 1980-11-29 | 1980-11-29 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17028180U JPS627745Y2 (en) | 1980-11-29 | 1980-11-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5796277U JPS5796277U (en) | 1982-06-14 |
| JPS627745Y2 true JPS627745Y2 (en) | 1987-02-23 |
Family
ID=29528726
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17028180U Expired JPS627745Y2 (en) | 1980-11-29 | 1980-11-29 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS627745Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8952116B2 (en) | 2009-09-29 | 2015-02-10 | Nippon Shokubai Co., Ltd. | Particulate water absorbent and process for production thereof |
-
1980
- 1980-11-29 JP JP17028180U patent/JPS627745Y2/ja not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8952116B2 (en) | 2009-09-29 | 2015-02-10 | Nippon Shokubai Co., Ltd. | Particulate water absorbent and process for production thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5796277U (en) | 1982-06-14 |
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