JPS6257791B2 - - Google Patents
Info
- Publication number
- JPS6257791B2 JPS6257791B2 JP8825480A JP8825480A JPS6257791B2 JP S6257791 B2 JPS6257791 B2 JP S6257791B2 JP 8825480 A JP8825480 A JP 8825480A JP 8825480 A JP8825480 A JP 8825480A JP S6257791 B2 JPS6257791 B2 JP S6257791B2
- Authority
- JP
- Japan
- Prior art keywords
- bit
- rock
- circular hole
- drilling
- hole
- 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
- 239000011435 rock Substances 0.000 claims description 27
- 238000005553 drilling Methods 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 7
- 239000000843 powder Substances 0.000 description 4
- 238000007796 conventional method Methods 0.000 description 2
- 239000002360 explosive Substances 0.000 description 2
- 239000003721 gunpowder Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005422 blasting Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Earth Drilling (AREA)
Description
【発明の詳細な説明】
本発明は、岩盤に設ける火薬孔として破砕境界
線上に位置する円孔の壁面に破砕境界線に向かう
互いに対向する一対の溝を有する溝付き孔を岩盤
にさく孔する溝付き孔のさく孔方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention involves drilling a grooved hole in a rock as a gunpowder hole in a rock, having a pair of grooves facing each other toward the fracture boundary on the wall of the circular hole located on the fracture boundary. The present invention relates to a method for drilling grooved holes.
一般に、岩盤を破砕してトンネル等を掘さくす
る場合、破砕境界線に対して大きな角度をなす亀
裂が岩盤に発生するのを防止するために、破砕境
界線上に位置する火薬孔については、円孔の壁面
に破砕境界線に沿つた一対の対向する溝を掘さく
してなる溝付き孔に形成して、***の際の爆発力
を溝のガイドにより集中的に破砕境界線に向けて
作用させることにより、破砕境界線に沿つた良好
な破砕面を得るようにすることが行われている。
そして、このような溝付き孔を岩盤にさく孔する
方法としては、従来、さく岩機で通常の円孔をさ
く孔した後、互いに180゜だけ向きの異なる一対
の噴射口を備えた高圧ノズルを該円孔内に挿入
し、該ノズルから高圧水を噴射して該高圧水の噴
射圧により溝を掘さくする方法（特開昭53―
125334号公報参照）や、円孔のさく孔後、該円孔
より小径のガイド部と該ガイド部後方に位置する
溝掘用チツプとを備えたさく孔用ビツトを用い
て、上記ガイド部を円孔に挿入して溝掘用チツプ
をガイドしながら該チツプにより溝を掘さくする
方法等が採られている。 Generally, when excavating tunnels etc. by crushing rock, in order to prevent cracks from forming in the rock that form large angles to the fracture boundaries, powder holes located on the fracture boundaries are placed in circles. A grooved hole is formed by digging a pair of opposing grooves along the fracture boundary line in the wall of the hole, so that the explosive force during blasting is concentrated and directed toward the fracture boundary line by the guide of the grooves. By doing so, a good fracture surface along the fracture boundary line is obtained.
The conventional method for drilling such grooved holes in rock is to use a rock drill to drill a regular circular hole, and then use a high-pressure nozzle equipped with a pair of injection ports oriented 180 degrees apart from each other. is inserted into the circular hole, and high-pressure water is injected from the nozzle to dig a groove using the jetting pressure of the high-pressure water (Japanese Patent Laid-Open No. 1983-
125334), or after drilling a circular hole, use a drilling bit equipped with a guide part with a smaller diameter than the circular hole and a trenching tip located behind the guide part to drill the guide part. A method has been adopted in which a trench-digging chip is inserted into a circular hole and a trench is dug with the chip while being guided.
しかしながら、上記従来の方法は何れも、円孔
をさく孔した後に該円孔を基準にして溝を掘さく
するため、円孔のさく孔作業および溝の掘さく作
業の２つの作業工程を要し、しかも溝掘さく時の
円孔に対する溝の位置合わせが面倒であり、作業
手間がかかり、作業時間が長くなるという問題を
有していた。 However, in all of the above conventional methods, after drilling a circular hole, a trench is dug based on the circular hole, so two work steps are required: drilling the circular hole and digging the trench. However, when digging a trench, it is troublesome to align the trench with respect to the circular hole, which results in a time-consuming process and a long working time.
本発明はかかる点に鑑みてなされたものであ
り、さく岩機のロツド先端に配置した前側ビツト
に回転力と打撃力とを与えて岩盤に円孔をさく孔
するとともに、上記前側ビツトより所定距離離れ
た後方位置に割りブツシユを介して取付けられた
後側ビツトに打撃力のみを与えて、上記先行した
前側ビツトのさく孔に同期しながら、上記円孔の
壁面に互いに対向する一対の溝を掘さくすること
により、さく岩機の一作業工程により円孔と溝と
を同時に形成することができ、よつて作業手間の
簡略化および作業時間の短縮化を図り得るように
した溝付きの孔のさく孔方法を提供せんとするも
のである。 The present invention has been made in view of this point, and it applies rotational force and striking force to the front bit placed at the tip of the rod of a rock drill to drill a circular hole in the rock, and at the same time drills a circular hole in the rock by applying a rotational force and a striking force to the front bit placed at the tip of the rod of the rock drill. Applying only a striking force to the rear bit installed at a rear position a distance apart via a split bushing, a pair of grooves facing each other are formed in the wall surface of the circular hole in synchronization with the hole being drilled by the preceding front bit. By drilling, a circular hole and a groove can be formed at the same time in one work process of the rock drill, thereby simplifying the work effort and shortening the work time. It is an object of the present invention to provide a method for drilling holes.
以下、本発明を図面に示す実施例に基づいて詳
細に説明する。 Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
第１図ないし第４図は本発明方法に使用する溝
付き孔さく孔用ビツトＡを示し、１は基端部がさ
く岩機（図示せず）に連結され、先端部に先細り
テーパ状部１ａを有するロツドであつて、該ロツ
ド１の先細りテーパ状部１ａには、円柱状の頭部
２ａと該頭部２ａと一体に形成された所定長さの
スカート部２ｂとからなる前側ビツト２が外嵌さ
れて固定され、該前側ビツト２の頭部２ａ前面に
は４枚のチツプ３，３，…が取付けられており、
さく岩機から伝えられるロツド１の回転力と打撃
力とを前側ビツト２に作用させて該前側ビツト２
を回転させながら前進させ、頭部２ａのチツプ
３，３，…により岩盤Ｇに円孔B1をさく孔する
ように設けられている。また、上記前側ビツト２
のスカート部２ｂ後端側には該スカート部２ｂの
外径より大きい外径の環状突起４が一体に形成さ
れ、該環状突起４の直前位置のスカート部２ｂに
は一対のテーパ状割りブツシユ５，５を介して後
側ビツト６が、上記前側ビツト２の頭部２ａとの
間に上記割りブツシユ５，５の長さ以上の間隔を
あけて且つ割りブツシユ５，５と一体様に回転自
在に外嵌されて取付けられ、該後側ビツト６は、
前側ビツト２の頭部２ａと略同じ半径を有する本
体６ａと、該本体６ａの外周部に互いに対向する
ように翼状に突出し且つロツド１長手方向に延び
る一対の突片６ｂ，６ｂとからなり、上記各突片
６ｂの前端面にはチツプ７が取付けられ、また上
記後側ビツト６と一体様の割りブツシユ５，５の
後端面には上記環状突起４を介してロツド１の打
撃力を受ける打撃受面８，８が形成されており、
上記ロツド１の打撃力のみを後側ビツト６に作用
させて該後側ビツト６を上記前側ビツト２と同期
させつつ前進させ、突片６ｂ，６ｂのチツプ７，
７により上記円孔B1の壁面に互いに対向する一
対の溝B2，B2を掘さくするように設けられてな
るものである。 1 to 4 show a grooved hole drilling bit A used in the method of the present invention, in which the base end is connected to a rock drill (not shown) and the tip end has a tapered part. 1a, the tapered portion 1a of the rod 1 has a front bit 2 consisting of a cylindrical head 2a and a skirt portion 2b of a predetermined length formed integrally with the head 2a. is externally fitted and fixed, and four chips 3, 3, ... are attached to the front of the head 2a of the front bit 2,
The rotational force and impact force of the rod 1 transmitted from the rock drill are applied to the front bit 2, and the front bit 2 is
is moved forward while rotating, and a circular hole B1 is drilled in the rock G by the tips 3, 3, . . . of the head 2a. In addition, the front bit 2
An annular projection 4 having an outer diameter larger than the outer diameter of the skirt portion 2b is integrally formed on the rear end side of the skirt portion 2b, and a pair of tapered split bushes 5 are provided on the skirt portion 2b at a position immediately before the annular projection 4. , 5, the rear bit 6 is rotatable integrally with the split bushes 5, 5 with an interval greater than the length of the split bushes 5, 5 between them and the head 2a of the front bit 2. The rear bit 6 is fitted externally to the
It consists of a main body 6a having approximately the same radius as the head 2a of the front bit 2, and a pair of projecting pieces 6b, 6b protruding from the outer circumference of the main body 6a in a wing shape so as to face each other and extending in the longitudinal direction of the rod 1, A tip 7 is attached to the front end surface of each of the protrusions 6b, and the rear end surfaces of the split bushes 5, 5, which are integral with the rear bit 6, receive the impact force of the rod 1 via the annular projection 4. Impact receiving surfaces 8, 8 are formed,
Only the striking force of the rod 1 is applied to the rear bit 6 to move the rear bit 6 forward in synchronization with the front bit 2, and the tips 7 of the projections 6b, 6b are moved forward.
7, a pair of grooves B 2 , B 2 facing each other are bored in the wall surface of the circular hole B 1 .
そして、上記溝付き孔さく孔用ビツトＡを用い
て、第５図に示すように岩盤Ｇの破砕境界線ｌに
沿つて溝付き孔Ｂ（火薬孔）をさく孔する場合、
第１図に示すように、さく岩機のロツド１先端に
配置された前側ビツト２にさく岩機から伝えられ
るロツド１の回転力と打撃力とを与えて該前側ビ
ツト２を回転させながら前進させ、この前側ビツ
ト２の回転運動および前進運動により該前側ビツ
ト２の頭部２ａ前面のチツプ３，３，…により岩
盤Ｇに円孔B1をさく孔する。 Then, when drilling a grooved hole B (powder hole) along the fracture boundary line l of the rock G as shown in FIG. 5 using the grooved hole drilling bit A,
As shown in Fig. 1, the rotational force and striking force of the rod 1 transmitted from the rock drill are applied to the front bit 2 placed at the tip of the rod 1 of the rock drill, and the rock drill moves forward while rotating the front bit 2. By rotating and advancing the front bit 2, a circular hole B1 is drilled in the rock G by the tips 3, 3, . . . on the front surface of the head 2a of the front bit 2.
それと同時に、上記前側ビツト２の頭部２ａよ
り所定距離離れた後方位置に割にブツシユ５，５
を介して取付けられ且つ外周部に一対の対向する
突片６ｂ，６ｂを翼状に突出して有する後側ビツ
ト６を、適宜ガイド装置（図示せず）により上記
突片６ｂ，６ｂの円孔B1に対する位置決めガイ
ドを行いつつ、すなわち突片６ｂ，６ｂが第５図
に示すような岩盤Ｇの破砕境界線ｌに沿うように
ガイドしつつ、該後側ビツト６に、前側ビツト２
の環状突起４および上記各割りブツシユ５後端面
の打撃受面８を介して上記ロツド１の打撃力のみ
を与えて、上記先行した前側ビツト２のさく孔動
作に同期して該後側ビツト６を前進させ、この後
側ビツト６の前進運動により後側ビツト６の上記
各突片６ｂ前端面に取付けたチツプ７により上記
円孔B1の壁面の所定位置に破砕境界線ｌに向か
う互いに対向する一対の溝B2，B2を掘さくす
る。その際、このような円孔B1のさく孔と溝
B2，B2の掘さくとが進行して、上記ガイド装置
のガイド作用が終わる、すなわち後側ビツト６が
ガイド装置を通過してしまつた後は、後側ビツト
６は該後側ビツト６によつて既に掘さくした溝
B2，B2自体の突片６ｂ，６ｂに対するガイド作
用により、新たな溝B2，B2の掘さくが進行し続
け、これにより対向する一対の溝B2，B2が所定
方向（破砕境界線ｌに向かう方向）に正確に掘さ
くされ、第５図に示すように破砕境界線ｌに沿つ
た溝B2，B2を有する溝付き孔Ｂ（火薬孔）が破
砕境界線ｌ上に多数さく孔される。 At the same time, bushes 5 and 5 are installed at a rear position a predetermined distance away from the head 2a of the front bit 2.
The rear bit 6 is attached to the rear bit 6 and has a pair of opposing projecting pieces 6b, 6b protruding from the outer periphery in a wing-like manner . The front bit 2 is attached to the rear bit 6 while guiding the protrusions 6b, 6b along the fracture boundary line l of the rock G as shown in FIG.
Only the impact force of the rod 1 is applied through the annular protrusion 4 and the impact receiving surface 8 of the rear end surface of each of the split bushes 5 to drill the rear bit 6 in synchronization with the preceding drilling operation of the front bit 2. The forward movement of the rear bit 6 causes the chips 7 attached to the front end surface of each of the protrusions 6b of the rear bit 6 to move the chips 7 to a predetermined position on the wall of the circular hole B1 facing each other toward the fracture boundary line l. A pair of grooves B 2 and B 2 are dug. At that time, the drilling and groove of circular hole B 1 like this
After the digging of B 2 and B 2 progresses and the guiding action of the guide device ends, that is, after the rear bit 6 has passed through the guide device, the rear bit 6 trench already dug by
Due to the guiding action of B 2 , B 2 themselves on the protrusions 6 b , 6 b, digging of new grooves B 2 , B 2 continues to proceed, and as a result, a pair of opposing grooves B 2 , B 2 are formed in a predetermined direction (crushing A grooved hole B (powder hole) having grooves B 2 and B 2 along the fracture boundary line l is excavated accurately in the direction toward the fracture boundary line l, as shown in Fig. 5. Many holes are drilled in the area.
このようにして得られた溝付き孔Ｂは、円孔
B1の壁面に設けた溝B2，B2が破砕境界線ｌに沿
つて捩れることなく略正確に位置するので、この
溝付き孔Ｂを火薬孔として岩盤Ｇを***すると、
溝B2，B2のガイドにより爆発力が破砕境界線ｌ
方向に集中的に作用することになり、良好な破砕
面を得ることができる。 The grooved hole B obtained in this way is a circular hole.
Since the grooves B 2 and B 2 provided on the wall of B 1 are located almost exactly along the fracture boundary line l without being twisted, if the rock G is blasted using the grooved hole B as a powder hole,
The guide of grooves B 2 and B 2 allows the explosive force to reach the fracture boundary line l.
Since the action is concentrated in the direction, a good crushing surface can be obtained.
以上説明したように、本発明によれば、さく岩
機のロツド先端に配置した前側ビツトに回転力と
打撃力とを与えて岩盤に円孔をさく孔するととも
に、この先行した前側ビツトのさく孔に同期し
て、上記前側ビツトより所定距離離れた後方位置
に割りブツシユを介して取り付けられた後側ビツ
トに打撃力のみを与えて、上記円孔の壁面に互い
に対向する一対の溝を掘さくするものであるの
で、トンネル等の掘さくにおいて良好な破砕面を
得ることができる火薬孔用溝付き孔のさく孔作業
を一工程で行うことができ、作業手間の簡略化お
よび作業時間の短縮化を図ることができる。 As explained above, according to the present invention, rotational force and striking force are applied to the front bit placed at the tip of the rod of the rock drill to drill a circular hole in the rock, and the drilling of the front bit that has preceded the drill is performed. In synchronization with the hole, a pair of grooves facing each other are dug in the wall of the circular hole by applying only a striking force to the rear bit, which is attached via a split bushing at a rear position a predetermined distance from the front bit. Since it is a material for drilling tunnels, it is possible to drill a grooved hole for a gunpowder hole in a single step, which allows obtaining a good fracture surface when excavating tunnels, etc., which simplifies the work and reduces work time. It is possible to shorten the time.
図面は本発明の実施態様を例示し、第１図は縦
断面図、第２図は第１図の―線断面図、第３
図は第１図の―線断面図、第４図は第１図の
―線断面図、第５図はトンネルを掘さくする
岩盤の正面図である。
１……ロツド、２……前側ビツト、４……環状
突起、６……後側ビツト、６ｂ……突片、Ａ……
溝付き孔さく孔用ビツト、Ｇ……岩盤、Ｂ……溝
付き孔、B1……円孔、B2……溝。
The drawings illustrate embodiments of the present invention, and FIG. 1 is a longitudinal sectional view, FIG.
The figure is a sectional view taken along the line - - of Fig. 1, Fig. 4 is a sectional view taken along the line - - of Fig. 1, and Fig. 5 is a front view of the rock into which the tunnel will be excavated. 1...Rod, 2...Front bit, 4...Annular projection, 6...Rear bit, 6b...Protrusion piece, A...
Bit for drilling grooved holes, G...rock, B...grooved hole, B1 ...circular hole, B2 ...groove.
Claims (1)
に回転力と打撃力とを与えて岩盤に円孔をさく孔
するとともに、上記前側ビツトより所定距離離れ
た後方位置に割りブツシユを介して取付けられた
後側ビツトに打撃力のみを与えて、上記先行した
前側ビツトのさく孔に同期しながら、上記円孔の
壁面に互いに対向する一対の溝を掘さくすること
を特徴とする溝付き孔のさく孔方法。1 A circular hole is drilled in the rock by applying rotational force and impact force to the front bit placed at the tip of the rod of the rock drill, and the drill is attached via a split bushing to a rear position a predetermined distance from the front bit. The grooved hole is characterized in that a pair of grooves facing each other are dug in the wall surface of the circular hole in synchronization with the drilling of the preceding front bit by applying only a striking force to the rear bit. Drilling method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8825480A JPS5712793A (en) | 1980-06-27 | 1980-06-27 | Drilling of grooved hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8825480A JPS5712793A (en) | 1980-06-27 | 1980-06-27 | Drilling of grooved hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5712793A JPS5712793A (en) | 1982-01-22 |
| JPS6257791B2 true JPS6257791B2 (en) | 1987-12-02 |
Family
ID=13937724
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8825480A Granted JPS5712793A (en) | 1980-06-27 | 1980-06-27 | Drilling of grooved hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5712793A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6180883U (en) * | 1984-10-30 | 1986-05-29 |
-
1980
- 1980-06-27 JP JP8825480A patent/JPS5712793A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5712793A (en) | 1982-01-22 |
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