JP2008248553A - Method of sampling core - Google Patents

Method of sampling core Download PDF

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JP2008248553A
JP2008248553A JP2007090695A JP2007090695A JP2008248553A JP 2008248553 A JP2008248553 A JP 2008248553A JP 2007090695 A JP2007090695 A JP 2007090695A JP 2007090695 A JP2007090695 A JP 2007090695A JP 2008248553 A JP2008248553 A JP 2008248553A
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core
excavation
boring rod
water
pipe
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JP4410808B2 (en
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Masahiro Konishi
正洋 小西
Katsuto Shibata
勝登 柴田
Masashi Shigetome
正志 重留
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KYUSHU DENGI KAIHATSU KK
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Abstract

<P>PROBLEM TO BE SOLVED: To smoothly and efficiently sample a core of good quality while surely discharging slime with a small quantity of excavation water when the core is sampled using a double tube sampler. <P>SOLUTION: An impregnated bit sintered by mixing a diamond powder with a metal powder is used as an excavation bit. A boring device used is so structured that a boring rod and the output shaft of its drive source are disposed on the same rotating axis. The rotating speed of the boring rod is set to 300 rpm for sediment, and 1,400 rpm for hard rock. The excavation water used is the mixture obtained by mixing a thickener with water at a rate of 80-120 mL/100 L. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、二重管構造のサンプラーを用いたコアの採取方法に関する。   The present invention relates to a core collection method using a sampler having a double-pipe structure.

従来、先端に掘削ビットを備えた回転自在の外管とコアを収容する非回転の内管で構成された二重管構造のサンプラーをボーリングロッドの先端に取り付け、ボーリングロッドを回転させて掘進方向へ荷重しながら掘削ビットで地盤を掘削し、掘削と並行して掘進用水をボーリングロッド内及び外管と内管の間を通じて送水して切羽へ吐出し、スライムを外管と孔壁の間を通じて掘進用水で排出させながらコアを内管へ収容するコアの採取方法が公知である（例えば特許文献１参照）。   Conventionally, a double-pipe sampler consisting of a rotatable outer tube with a drill bit at the tip and a non-rotating inner tube that houses the core is attached to the tip of the boring rod, and the boring rod is rotated to move in the direction of digging While excavating the ground with a drill bit, water for excavation is sent through the boring rod and between the outer pipe and the inner pipe and discharged to the face in parallel with the excavation, and the slime passes between the outer pipe and the hole wall. A method of collecting a core that accommodates the core in an inner pipe while being discharged with digging water is known (see, for example, Patent Document 1).

ところで、従来技術ではボーリングロッドの回転速度が１００ｒｐｍと低速で大きな荷重をかけながら掘削するから、粒径の大きいスライムが生じるとともに掘削時の衝撃も大きいものとなる。したがって、スライムを排出するために多量の掘進用水が必要になるとともに衝撃がコアや削孔に伝わり、コアの欠損や流出及び孔壁の崩落等を生じさせて掘進能率やコア採取率を低下させていた。
特開平８−４４６８号公報 By the way, in the prior art, excavation is performed while applying a large load at a low rotation speed of the boring rod of 100 rpm, so that slime having a large particle size is generated and impact during excavation is large. Therefore, a large amount of water for digging is required to discharge the slime, and the impact is transmitted to the core and the drilling hole, causing the core to be lost, outflow, collapse of the hole wall, etc. It was.
JP-A-8-4468

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、少量の掘進用水でスライムを確実に排出しながら良質のコアを円滑且つ能率的に採取できるコアの採取方法を提供することにある。   The problem to be solved by the present invention is to solve these conventional problems and provide a core collection method capable of smoothly and efficiently collecting a good quality core while reliably discharging slime with a small amount of water for digging. There is.

かかる課題を解決した本発明の構成は、
１） 先端に掘削ビットを備えた回転自在の外管とコアを収容する非回転の内管で構成された二重管構造のサンプラーをボーリングロッドの先端に取り付け、ボーリングロッドを回転させて掘進方向へ荷重しながら掘削ビットで地盤を掘削し、掘削と並行して掘進用水をボーリングロッド内及び外管と内管の間を通じて送水して切羽へ吐出し、スライムを外管と孔壁の間を通じて掘進用水で排出させながらコアを内管へ収容するようにしたコアの採取方法において、掘削ビットとしてダイヤモンド粉末と金属粉末を混合して焼結したインプリグネイテッド型ビットを用い、ボーリングロッドの回転速度を地質が土砂の場合に３００〜８００ｒｐｍに設定し、掘進用水として増粘剤を１００〜１２０ｍＬ／１００Ｌの割合で混合したものを用いたことを特徴とする、コアの採取方法
２） 先端に掘削ビットを備えた回転自在の外管とコアを収容する非回転の内管で構成された二重管構造のサンプラーをボーリングロッドの先端に取り付け、ボーリングロッドを回転させて掘進方向へ荷重しながら掘削ビットで地盤を掘削し、掘削と並行して掘進用水をボーリングロッド内及び外管と内管の間を通じて送水して切羽へ吐出し、スライムを外管と孔壁の間を通じて掘進用水で排出させながらコアを内管へ収容するようにしたコアの採取方法において、掘削ビットとしてダイヤモンド粉末と金属粉末を混合して焼結したインプリグネイテッド型ビットを用い、ボーリングロッドの回転速度を地質が硬岩の場合に８００〜３０００ｒｐｍに設定し、掘進用水として増粘剤を８０〜１００ｍＬ／１００Ｌの割合で混合したものを用いたことを特徴とする、コアの採取方法
３） ボーリング装置として、ボーリングロッドとその駆動源の出力軸を同一回転軸上に配置できる構造のものを用いた、前記１）又は２）記載のコアの採取方法
にある。 The configuration of the present invention that solves this problem is as follows.
1) A double-pipe sampler consisting of a rotatable outer tube with a drilling bit at the tip and a non-rotating inner tube that houses the core is attached to the tip of the boring rod, and the boring rod is rotated to dig in While excavating the ground with a drill bit, water for excavation is sent through the boring rod and between the outer pipe and the inner pipe and discharged to the face in parallel with the excavation, and the slime passes between the outer pipe and the hole wall. In the core sampling method in which the core is accommodated in the inner pipe while being discharged with water for excavation, the drilling bit uses an impregnated type bit that is sintered by mixing diamond powder and metal powder, and the rotation speed of the boring rod Is set to 300 to 800 rpm when the geology is earth and sand, and a thickener mixed at a rate of 100 to 120 mL / 100 L is used as water for excavation. Core sampling method 2) A double-pipe sampler consisting of a rotatable outer tube with a drilling bit at the tip and a non-rotating inner tube that houses the core is attached to the tip of the boring rod. Attach and rotate the boring rod to load in the direction of excavation, excavate the ground with the excavating bit, and in parallel with excavation, feed the excavating water through the boring rod and between the outer pipe and the inner pipe and discharge it to the face. In the core collection method in which the core is accommodated in the inner pipe while the slime is discharged with the water for drilling through the outer pipe and the hole wall, the diamond bit and the metal powder are mixed and sintered as a drill bit. Using a mold bit, the rotation speed of the boring rod is set to 800 to 3000 rpm when the geology is hard rock, and a thickener is used as water for excavation 80 to 100 mL / 10 Core sampling method characterized by using a mixture at a rate of 0 L 3) As a boring device, a boring device having a structure in which an output shaft of a boring rod and its driving source can be arranged on the same rotation axis was used. The core collection method according to 1) or 2).

本発明によれば、ボーリングロッドを従来技術と比較して３〜３０倍と高速回転させて掘削するから、必要な荷重が約１／１０に低減され、掘削時の衝撃を大幅に抑制してコア採取率が向上する。また、低荷重高速回転によりスライムの粒径が小さくなるから、スライムの排出に必要な掘進用水の送水量も増粘化で大幅に低減され、孔壁の崩落やコアの欠損・流出を防止して良質のコアを円滑且つ能率良く採取できる。   According to the present invention, the drilling is performed by rotating the boring rod at a high speed of 3 to 30 times compared with the prior art, so that the necessary load is reduced to about 1/10, and the impact during excavation is greatly suppressed. Core collection rate is improved. In addition, since the slime particle size is reduced by low-load, high-speed rotation, the amount of water used for digging water required for slime discharge is greatly reduced by increasing the viscosity, preventing the collapse of the hole wall and the loss or outflow of the core. High quality cores can be collected smoothly and efficiently.

本発明では、増粘剤を８０〜１２０ｍＬ／１００Ｌの割合で混合する。８０ｍＬ以下であるとスライムの排出が十分で無く、外管と孔壁の間にスライムが詰まるという問題があり、１２０ｍＬ以上だとスライムの排出速度が遅く、掘進能率が低下するという問題がある。増粘剤としてはアクリルポリマーなど市販されている一般的なものが使用できる。ボーリング装置としてボーリングロッドとその駆動源の出力軸を同一回転軸上に配置できる構造のものを用いると、掘削深さが深くてもボーリングロッドが歪曲され難く、先端のサンプラーの振動を抑制してコアの品質を維持できる。以下、本発明の実施例を図面に基づいて具体的に説明する。   In this invention, a thickener is mixed in the ratio of 80-120 mL / 100L. If it is 80 mL or less, there is a problem that slime is not sufficiently discharged, and the slime is clogged between the outer tube and the hole wall, and if it is 120 mL or more, there is a problem that the discharge rate of the slime is slow and the excavation efficiency is lowered. As the thickener, commercially available general materials such as acrylic polymers can be used. If a boring rod with a structure that allows the boring rod and the output shaft of its drive source to be arranged on the same rotation axis is used, the boring rod is not easily distorted even when the excavation depth is deep, and the vibration of the sampler at the tip is suppressed. The core quality can be maintained. Embodiments of the present invention will be specifically described below with reference to the drawings.

図１は実施例のボーリング装置の説明図、図２は実施例のボーリング装置の拡大説明図、図３は実施例の掘進用水の流れを示す説明図である。図中、１はロッドホルダー、１ａはペダル、２はベース、２ａはウインチ台、２ｂはジャッキ、３は昇降用フレーム、３ａはラック、４は電動コアドリル、４ａは加圧用レバー、４ｂは回転部、５はボーリングロッド、５ａは分割ロッド、６はサンプラー、６ａは掘削ビット、６ｂは外管、６ｃは内管、６ｄは流路、７はウインチ、７ａは巻取部、８はやぐら、９は滑車、１０はワイヤー、１１は発電機、１２はアンカー、１３はホース、Ｃはコア、Ｇは地盤、Ｇａはスライム、Ｈは削孔、Ｈａは切羽、Ｈｂは孔壁、Ｗは掘進用水である。   FIG. 1 is an explanatory diagram of the boring device of the embodiment, FIG. 2 is an enlarged explanatory diagram of the boring device of the embodiment, and FIG. 3 is an explanatory diagram showing the flow of the digging water of the embodiment. In the figure, 1 is a rod holder, 1a is a pedal, 2 is a base, 2a is a winch base, 2b is a jack, 3 is a lifting frame, 3a is a rack, 4 is an electric core drill, 4a is a pressure lever, 4b is a rotating part 5 is a boring rod, 5a is a split rod, 6 is a sampler, 6a is a drilling bit, 6b is an outer tube, 6c is an inner tube, 6d is a flow path, 7 is a winch, 7a is a winding part, 8 is a tower, 9 Is a pulley, 10 is a wire, 11 is a generator, 12 is an anchor, 13 is a hose, C is a core, G is a ground, Ga is a slime, H is a drilling hole, Ha is a face, Hb is a hole wall, W is a water for digging It is.

本実施例のボーリング装置は、図１に示すようにロッドホルダー１を備えたベース２上に垂直の昇降用フレーム３を脱着自在に取り付け、昇降用フレーム３に下降用の加圧用レバー４ａを備えた下向きの電動コアドリル４を昇降自在且つ脱着自在に取り付け、電動コアドリル４の回転部４ｂにボーリングロッド５をロッドホルダー１を通じて脱着自在に連結し、ボーリングロッド５の先端にサンプラー６を取り付けている。   As shown in FIG. 1, the boring apparatus of the present embodiment has a vertical lifting frame 3 detachably attached to a base 2 having a rod holder 1, and a lifting pressure lever 4 a for lowering. A downwardly-facing electric core drill 4 is attached so as to be movable up and down and detachable. A boring rod 5 is detachably connected to a rotating portion 4 b of the electric core drill 4 through a rod holder 1, and a sampler 6 is attached to the tip of the boring rod 5.

ロッドホルダー１はペダル１ａを取り付けて操作性を向上している。ベース２にはその上面の水平レベルを調節するジャッキ２ｂを四脚に備えており、掘進時に半力不足でずれないようにアンカー１２で地盤Ｇに固定されている。昇降用フレーム３にはラック３ａが刻設されており、加圧用レバー４ａの回転で電動コアドリル４の図示しないギヤがラック３ａと歯合しながら昇降用フレーム３に沿って昇降できるようにしている。   The rod holder 1 is provided with a pedal 1a to improve operability. The base 2 is provided with a jack 2b for adjusting the horizontal level of the upper surface of the base 2 and is fixed to the ground G with an anchor 12 so that it does not shift due to insufficient half-power during excavation. A rack 3a is engraved in the lifting frame 3, and a gear (not shown) of the electric core drill 4 can move up and down along the lifting frame 3 while meshing with the rack 3a by the rotation of the pressurizing lever 4a. .

電動コアドリル４は３００／８００／１４００ｒｐｍの切替式で、回転部４ｂに外部から供給した掘進用水Ｗをボーリングロッド５内に給水するホース１３を接続している。ボーリングロッド５は複数の分割ロッド５ａを掘進深さに応じて連結している。やぐら８は分割可能な三脚パイプで、その頂上部から吊下した滑車９にウインチ７の巻取部７ａからのワイヤー１０を巻架し、サンプラー６の引き上げ時に用いられる。   The electric core drill 4 is a switching type of 300/800/1400 rpm, and is connected to a hose 13 for supplying the drilling water W supplied from the outside to the rotating part 4b into the boring rod 5. The boring rod 5 connects a plurality of split rods 5a according to the depth of excavation. The tower 8 is a separable tripod pipe. The wire 10 from the winding part 7a of the winch 7 is wound around the pulley 9 suspended from the top of the pipe, and is used when the sampler 6 is pulled up.

サンプラー６は、ダイヤモンド粉末と金属粉末を混合して焼結したインプリグネイテッド型の掘削ビット６ａと、回転自在の外管６ｂと、コアＣを収容する非回転の内管６ｃとで構成され、外管６ｂと内管６ｃの間には、ボーリングロッド５内を通じて供給した掘進用水Ｗを送水するための流路６ｄが形成されている。外管６ｂの後端はボーリングロッド５の先端と直結している。掘進用水Ｗはアクリルポリマーからなる増粘剤を１００ｍＬ／１００Ｌの割合で混合している。   The sampler 6 is composed of an implemented excavation bit 6a obtained by mixing and sintering diamond powder and metal powder, a rotatable outer tube 6b, and a non-rotating inner tube 6c that accommodates the core C. Between the outer tube 6b and the inner tube 6c, a channel 6d for feeding the excavation water W supplied through the inside of the boring rod 5 is formed. The rear end of the outer tube 6 b is directly connected to the tip of the boring rod 5. The water for digging W is mixed with a thickener made of acrylic polymer at a rate of 100 mL / 100 L.

本実施例では、発電機１１で給電しながら電動コアドリル４を駆動させてボーリングロッド５を回転させ、加圧用レバー４ａを下降操作してサンプラー６を地中に圧入するとともに、ホース１３及びボーリングロッド５を通じて掘進用水Ｗを給水し、掘削ビット６ａで地盤Ｇを掘削しながら掘進用水Ｗを流路６ｄを通じて切羽Ｈａへ吐出する。ボーリングロッド５の回転速度は、地質が土砂の場合は３００ｒｐｍに、地質が硬岩の場合は１４００ｒｐｍに切り替える。   In this embodiment, the electric core drill 4 is driven while the power is supplied by the generator 11 to rotate the boring rod 5 and the pressurizing lever 4a is lowered to press the sampler 6 into the ground, and the hose 13 and the boring rod. The water for excavation W is supplied through 5, and the water for excavation W is discharged to the face Ha through the channel 6d while excavating the ground G with the excavation bit 6a. The rotation speed of the boring rod 5 is switched to 300 rpm when the geology is earth and sand and to 1400 rpm when the geology is hard rock.

図３に示すように、吐出した掘進用水Ｗは掘削ビット６ａを冷却するとともに外管６ｂの外方へ流れ、スライムＧａはその掘進用水Ｗの流れで外管６ｂと孔壁Ｈｂの間に運搬されて上昇しながら排出される。孔壁Ｈｂは掘進用水Ｗの粘性で崩落が防止される。掘進用水Ｗの一部は内管６ｃの内側にも流れ、内管６ｃとコアＣの間に適度な粘性の皮膜水が形成されてコアＣの挿入を円滑にする。掘進用水Ｗの吐出速度は粘性で緩和され、内管６ｃ内のコアの流出を防止する。   As shown in FIG. 3, the discharged excavation water W cools the excavation bit 6a and flows outward of the outer pipe 6b, and the slime Ga is transported between the outer pipe 6b and the hole wall Hb by the flow of the excavation water W. Then it is discharged while rising. The hole wall Hb is prevented from collapsing due to the viscosity of the water W for excavation. Part of the digging water W also flows inside the inner pipe 6c, and a moderately viscous coating water is formed between the inner pipe 6c and the core C to facilitate the insertion of the core C. The discharge speed of the digging water W is relaxed by viscosity, and the outflow of the core in the inner pipe 6c is prevented.

スライムＧａの粒径は高速回転による掘削で０．１ｍｍ以下の微粉状となり、スライムＧａの排出に必要な掘進用水Ｗの送水量が増粘化で大幅に低減される。従来技術では孔径を６７ｍｍとした場合、粒径０．１ｍｍ以下のスライムを排出するのに理論上およそ１２Ｌ／ｍｉｎの送水量が必要であるが、本実施例では２〜７Ｌ／ｍｉｎで十分であった。また、従来技術では孔径６７ｍｍで１００ｒｐｍとした場合、５０〜４５０ｋｇの荷重が必要であったが、本実施例では５〜１５ｋｇで従来技術と同等の掘進能率を確保できた。   The particle diameter of the slime Ga becomes a fine powder of 0.1 mm or less by excavation by high-speed rotation, and the water supply amount of the excavation water W necessary for discharging the slime Ga is greatly reduced by increasing the viscosity. In the conventional technique, when the hole diameter is 67 mm, a water supply amount of about 12 L / min is theoretically required to discharge slime having a particle diameter of 0.1 mm or less, but 2 to 7 L / min is sufficient in this embodiment. there were. Further, in the conventional technique, when the hole diameter is 67 mm and 100 rpm, a load of 50 to 450 kg is required, but in this example, a digging efficiency equivalent to that of the conventional technique can be secured with 5 to 15 kg.

本発明のコアの採取方法は、垂直方向のコア採取に最も効果を発揮するが、掘削角度には制限されず、様々な地質のコア採取に応用できる。   The core collection method of the present invention is most effective for vertical core collection, but is not limited to the excavation angle, and can be applied to various geological core collections.

実施例のボーリング装置の説明図である。It is explanatory drawing of the boring apparatus of an Example. 実施例のボーリング装置の拡大説明図である。It is expansion explanatory drawing of the boring apparatus of an Example. 実施例の掘進用水の流れを示す説明図である。It is explanatory drawing which shows the flow of the digging water of an Example.

符号の説明Explanation of symbols

１ ロッドホルダー
１ａ ペダル
２ ベース
２ａ ウインチ台
２ｂ ジャッキ
３ 昇降用フレーム
３ａ ラック
４ 電動コアドリル
４ａ 加圧用レバー
４ｂ 回転部
５ ボーリングロッド
５ａ 分割ロッド
６ サンプラー
６ａ 掘削ビット
６ｂ 外管
６ｃ 内管
６ｄ 流路
７ ウインチ
７ａ 巻取部
８ やぐら
９ 滑車
１０ ワイヤー
１１ 発電機
１２ アンカー
１３ ホース
Ｃ コア
Ｇ 地盤
Ｇａ スライム
Ｈ 削孔
Ｈａ 切羽
Ｈｂ 孔壁
Ｗ 掘進用水 DESCRIPTION OF SYMBOLS 1 Rod holder 1a Pedal 2 Base 2a Winch stand 2b Jack 3 Lifting frame 3a Rack 4 Electric core drill 4a Pressure lever 4b Rotating part 5 Boring rod 5a Dividing rod 6 Sampler 6a Drilling bit 6b Outer tube 6c Inner tube 6d Flow path 7 Winch 7a Winding part 8 Yagura 9 Pulley 10 Wire 11 Generator 12 Anchor 13 Hose C Core G Ground Ga Slime H Drilling hole Ha Face Hb Hole wall W Digging water

Claims (3)

先端に掘削ビットを備えた回転自在の外管とコアを収容する非回転の内管で構成された二重管構造のサンプラーをボーリングロッドの先端に取り付け、ボーリングロッドを回転させて掘進方向へ荷重しながら掘削ビットで地盤を掘削し、掘削と並行して掘進用水をボーリングロッド内及び外管と内管の間を通じて送水して切羽へ吐出し、スライムを外管と孔壁の間を通じて掘進用水で排出させながらコアを内管へ収容するようにしたコアの採取方法において、掘削ビットとしてダイヤモンド粉末と金属粉末を混合して焼結したインプリグネイテッド型ビットを用い、ボーリングロッドの回転速度を地質が土砂の場合に３００〜８００ｒｐｍに設定し、掘進用水として増粘剤を１００〜１２０ｍＬ／１００Ｌの割合で混合したものを用いたことを特徴とする、コアの採取方法。   A double-pipe sampler consisting of a rotatable outer tube with a drilling bit at the tip and a non-rotating inner tube that houses the core is attached to the tip of the boring rod, and the boring rod is rotated to load in the direction of digging While excavating the ground with a drill bit, in parallel to the excavation, the water for excavation is sent through the boring rod and between the outer pipe and the inner pipe and discharged to the face, and the slime is passed through the outer pipe and the hole wall. In the core collection method in which the core is accommodated in the inner pipe while being discharged by using an impregnated type bit in which diamond powder and metal powder are mixed and sintered as a drilling bit, the rotation speed of the boring rod is geologically controlled. Was set to 300-800 rpm when the earth and sand were used, and a thickener mixed at a rate of 100-120 mL / 100 L was used as water for excavation Wherein, the method taken in the core. 先端に掘削ビットを備えた回転自在の外管とコアを収容する非回転の内管で構成された二重管構造のサンプラーをボーリングロッドの先端に取り付け、ボーリングロッドを回転させて掘進方向へ荷重しながら掘削ビットで地盤を掘削し、掘削と並行して掘進用水をボーリングロッド内及び外管と内管の間を通じて送水して切羽へ吐出し、スライムを外管と孔壁の間を通じて掘進用水で排出させながらコアを内管へ収容するようにしたコアの採取方法において、掘削ビットとしてダイヤモンド粉末と金属粉末を混合して焼結したインプリグネイテッド型ビットを用い、ボーリングロッドの回転速度を地質が硬岩の場合に８００〜３０００ｒｐｍに設定し、掘進用水として増粘剤を８０〜１００ｍＬ／１００Ｌの割合で混合したものを用いたことを特徴とする、コアの採取方法。   A double-pipe sampler consisting of a rotatable outer tube with a drilling bit at the tip and a non-rotating inner tube that houses the core is attached to the tip of the boring rod, and the boring rod is rotated to load in the direction of digging While excavating the ground with a drill bit, in parallel to the excavation, the water for excavation is sent through the boring rod and between the outer pipe and the inner pipe and discharged to the face, and the slime is passed through the outer pipe and the hole wall. In the core collection method in which the core is accommodated in the inner pipe while being discharged by using an impregnated type bit in which diamond powder and metal powder are mixed and sintered as a drilling bit, the rotation speed of the boring rod is geologically controlled. Set to 800-3000 rpm when the rock is hard rock, and used a thickener mixed at a rate of 80-100 mL / 100 L as water for excavation Wherein, the method taken in the core. ボーリング装置として、ボーリングロッドとその駆動源の出力軸を同一回転軸上に配置できる構造のものを用いた、請求項１又は２記載のコアの採取方法。   The core collecting method according to claim 1 or 2, wherein a boring device having a structure in which a boring rod and an output shaft of a driving source thereof can be arranged on the same rotation shaft is used.
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CN103015904A (en) * 2012-12-24 2013-04-03 北京咏归科技有限公司 Sandstone soil extrusion taper-shaped sleeve diamond bit
CN103015904B (en) * 2012-12-24 2014-12-24 北京咏归科技有限公司 Sandstone soil extrusion taper-shaped sleeve diamond bit
CN108627362B (en) * 2018-05-09 2020-05-22 刘明亮 Concrete coring method intensity inspection coring device
JP2021092078A (en) * 2019-12-11 2021-06-17 ウィル・パワーグリッド株式会社 Boring machine for geological survey
JP7027392B2 (en) 2019-12-11 2022-03-01 東光電気工事株式会社 Boring device for geological survey
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