JP4101090B2 - How to bury underground anchors - Google Patents

How to bury underground anchors Download PDF

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Publication number
JP4101090B2
JP4101090B2 JP2003073935A JP2003073935A JP4101090B2 JP 4101090 B2 JP4101090 B2 JP 4101090B2 JP 2003073935 A JP2003073935 A JP 2003073935A JP 2003073935 A JP2003073935 A JP 2003073935A JP 4101090 B2 JP4101090 B2 JP 4101090B2
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Japan
Prior art keywords
anchor
hole
underground anchor
ground
underground
Prior art date
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Expired - Fee Related
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JP2003073935A
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JP2004044367A (en
Inventor
真夫 中島
純男 川村
道 鈴木
Original Assignee
旭テック株式会社
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Description

【0001】
【発明の属する技術分野】
本発明は、電柱の支線あるいは建築構物等を地中において支持する地中アンカ埋設方法に関する。
【0002】
【従来の技術】
本出願人は、先に、先端側に螺旋状の掘削刃を有する棒状の地中アンカを提案している(特許文献1〜5参照。)。図(a)は、先の提案に係る地中アンカの正面図、同図(b)は、その上面図である。地中アンカは、鋳鉄製からなり、全体形状が棒状を呈している。そして、その地中アンカの軸部1aの埋設時地中進入方向先端側(図(a)では下端部側)には、数個(図示の例では4個)の螺旋状の掘削刃2a,2b,2c,2d間欠的に軸部1aと一体に設けられている。これらの掘削刃2a,2b〜2dは、上方に行くほど、すなわち、掘削刃2aよりも2b、また、2bよりも2cの方が大径となるように構成されている。また、地中アンカの先端部分の軸部1aは、周知のドリルと同様に、切込刃を有するドリル部3に形成されている。
【0003】
地中アンカ1のドリル部3反対側の上端側には、地中アンカの軸部1aの径よりも少し大きな径を有するつば部4が設けられているとともに、そのつば部4の上端面には、四角柱からなる角柱部5に形成されている。この角柱部5は、穴掘建柱車等の回転機械の回転部(図示せず)に嵌合され、地中アンカをその回転部で回転しながら押下すると、地中アンカは、地中に埋設される。図(a),(b)中、6は、角柱部5に設けられた穴であり、図示しない支線を取付けるための取付部である。
【0004】
上記提案に係る地中アンカは、地中アンカの軸部1aに螺旋状の掘削刃2a,2b〜2d及び切込刃からなるドリル部3が形成されているので、地盤が硬くとも穴掘建柱車等のオーガ等の回転機械を用いて容易に掘削して埋設できる等の特長を有している。
【0005】
【特許文献1】
特開2000−1850号公報
【特許文献2】
特開2001−59221号公報
【特許文献3】
特開2001−182058号公報
【特許文献4】
特開2001−271346号公報
【特許文献5】
特開2001−271345号公報
【0006】
【発明が解決しようとする課題】
上記提案に係る地中アンカは、穴掘建柱車等の回転機械を用いて極めて簡単に地中アンカを埋設できるという特長を有している。しかしながら、地中アンカの埋設される地盤(地面)の性状は千差万別であり、特に、岩盤のような硬質の地盤の場合であっても容易に埋設できる地中アンカの出現が待たれていた。
【0007】
また、本出願人は、岩盤のような硬質の地盤であっても容易に地中アンカを埋設できるように、地中アンカを埋設するための下穴(前穴)を地面にあけるための超硬チップを有する工具を特願2002−18420号で提案している。しかし、可能であれば、このような工具を用いずに、又は、用いたとしても簡単な下穴加工で足りる地中アンカの出現が待たれていた。さらに、地面が水平線に対して所定の角度を有している法面(斜面)であっても、容易に地中アンカを埋設できるようにすることが望まれていた。
【0008】
そこで、本発明は、上記要望に応えるためになされたものであって、その目的は、硬質の地盤であっても、また、地面が法面であっても容易に地中アンカを埋設できる地中アンカの埋設方法を提供することにある。
【0009】
【課題を解決するための手段】
発明に係る地中アンカの埋設方法は、上記目的を達成するために、地中アンカ埋設しようとする位置に、先端に超硬チップを有する工具を用いて位置決め用穴をあける工程と、あけられた位置決め用穴に小口径ダウンザホールハンマ等のハンマで前記地中アンカが埋設できる深さを有し、かつ、その地中アンカの螺旋状の掘削刃の外径よりも僅かに小さい内径の下穴をあける工程と、あけられた下穴に、先端側に螺旋状の掘削刃を有する地中アンカを穴掘建柱車等の回転機械を用いて回転しながら押圧して嵌入する工程とからなることを特徴としている。
【0010】
【発明の実施の形態】
以下、本発明の実施の形態を図面に基づいて説明する。図1は、一実施の形態に係るアンカ埋設方法を示すフローシートである。図中、Gは、アンカAの埋設される地面であり、ここでは岩盤からなる法面として示されている。以下、フローシートの示される順序に従って説明する。
【0011】
(a)位置決め用穴あけ工程
地面Gの地中アンカ1の埋設位置に先端に超硬チップを有する工具10を用いて位置決め用の穴H1 があけられる。この工具10は、本出願人が先に、特願2002−18420号で提案したもので、所定の長さを有する棒状体11の一端部に図示しない穴掘建柱車の回転部M1 に着脱自在に装着される装着部12を設けるとともに、その棒状体11の他端部を鋭角に形成し、その鋭角に形成された箇所に上述の超硬チップが設けられて構成されている。
【0012】
この工具10を用いた位置決め用穴H1 は、工具10を地面Gに対して押圧しながら回転させることにより容易にあけることができる。あけられる位置決め用穴H1 の深さは数十cm、例えば20〜40cmで、その穴径は、後述の小口径ダウンザホールハンマ20の先端が挿入できる大きさである。
【0013】
(b)下穴あけ工程
工具10で位置決め用穴H1 があけられた後、その穴H1 に小口径ダウンザホールハンマ20の先端を挿入して地中アンカ1を嵌入するための下穴(前穴)があけられる。ここで用いられる小口径ダウンザホールハンマは、周知の岩盤に穴をあけるエアハンマである。この小口径ダウンザホールハンマ20による下穴H2 の穴あけは、上記回転部M1 の先端に小口径ダウンザホールハンマ20の駆動部21を接続し、その駆動部21に図示しない圧縮空気源から圧縮空気を供給するとともに、回転部M1 で回転力を加えることにより行われる。
【0014】
この小口径ダウンザホールハンマ20であけられる下穴H2 の深さは、地中アンカ1の長さとほぼ同じで、その穴径は、地中アンカに設けられている螺旋状の掘削刃2a〜2d(上記図2参照)のうちの最も大径の掘削刃2dよりも少し小さくあけられる。ここで使用される小口径ダウンザホールハンマ20は、圧縮空気源で駆動される市販のハンマである。岩盤に小径の穴をあけることができるハンマであれば、他の形式のハンマであってもよい。
【0015】
(c)地中アンカ嵌入工程
小口径ダウンザホールハンマ20であけられた下穴H2 に地中アンカ1が嵌入される。この地中アンカ1は、図2に示すものと同じであり、鋳鉄製からなり、先細りの軸部の周囲に螺旋状掘削刃2a〜2dが所定の間隔を保って複数個(図示の例では4個)設けられている。これら掘削刃2a〜2dは、上部側(回転部M 1 に接続される側)が大きくなるように決められている。そして、その軸部の上部側には、フランジが設けられているとともに、そのフランジの上側中央部には、アンカ1を穴掘建柱車の回転部M1 に接続するための角柱部5が設けられている。この地中アンカ1の角柱部5には、図示しない支線棒イ(後述の(d)参照)が取付けられ、その支線棒イを内部に格納できる円筒状の工具(図示せず)を介して地中アンカ1が回転部M1 により押圧されながら回転させられると、地中アンカ1は、地面G中に嵌入される。地中アンカ1の嵌入深さは、下穴H2 の深さによって決められるが、少なくとも最も大径の螺旋状の掘削刃2dが地中内になるように、好ましくは、つば部4の位置が地面Gの表面位置以下となるように嵌入される。
【0016】
(d)支線取付工程
下穴H2 に地中アンカ1の嵌入が終了すると、支線棒イの上部に支線(図示せず)が取付けられる。
【0017】
【発明の効果】
請求項1の発明による地中アンカの埋設方法は、地中アンカ埋設しようとする位置に、先端に超硬チップを有する工具を用いて位置決め用穴をあける工程と、あけられた位置決め用穴に小口径ダウンザホールハンマ等のハンマで前記地中アンカが埋設できる深さを有し、かつ、その地中アンカの螺旋状の掘削刃の外径よりも僅かに小さい内径の下穴をあける工程と、あけられた下穴に、先端側に螺旋状の掘削刃を有する地中アンカを穴掘建柱車等の回転機械を用いて回転しながら押圧して嵌入する工程とからなるので、地盤が岩盤等の硬質地盤でも地中アンカを容易に埋設することができる。
【図面の簡単な説明】
【図1】 発明の一実施の形態に係る地中アンカの埋設方法を実施するときの工程を示したフローシートである。
【図2】 (a)は先の提案に係る地中アンカの正面図、(b)はその上面図である。
【符号の説明】
中アンカ
1a 軸部
2a〜2d 螺旋状の掘削刃
3 ドリル部
ば部
柱部
付部
0 工具
20 小口径ダウンザホールハンマ
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to buried method of underground anchor supporting a branch or building structure or the like of the electric pole in the ground.
[0002]
[Prior art]
The present applicant has previously proposed a rod-shaped underground anchor having a spiral excavating blade on the tip side (see Patent Documents 1 to 5). 2 (a) is a front of the underground anchor according to proposed earlier view and FIG. (B) is a top view thereof. The underground anchor 1 is made of cast iron and has an overall shape of a rod. Then, the buried during ground approach direction front end side of the shaft portion 1a of the ground anchor 1 (FIGS. 2 (a) the lower end), helical drilling several double (four in the illustrated example) blades 2a, 2b, 2c, 2d are provided on the intermittently shaft portion 1a and one body. These digging edge 2a, 2b to 2d is closer to the upper, i.e., also 2b, than digging edge 2a, towards 2c is configured such that the diameter than 2b. Moreover, the shaft part 1a of the front-end | tip part of the underground anchor 1 is formed in the drill part 3 which has a cutting blade similarly to a well-known drill.
[0003]
To the drill part 3 of the ground anchor 1 opposite the upper end of, together with the flange portion 4 having a slightly larger diameter than the diameter of the shaft portion 1a of the ground anchor 1 is provided, the flange portion 4 The upper end surface is formed with a rectangular column portion 5 made of a quadrangular column. The prism portion 5 is fitted to the rotating part of a rotary machine such as Anaho Kenbashira vehicle (not shown), pressed while rotating the ground anchor 1 in the rotation portions Then, the ground anchor 1, ground Buried inside. 2 (a) and 2 (b), 6 is a hole provided in the prism portion 5 and is an attachment portion for attaching a branch line (not shown).
[0004]
In the underground anchor according to the above proposal, the shaft portion 1a of the underground anchor 1 is formed with the drill portion 3 composed of the spiral excavating blades 2a, 2b to 2d and the cutting blade. It has the feature that it can be easily excavated and embedded using a rotating machine such as an auger such as a construction pillar car.
[0005]
[Patent Document 1]
JP 2000-1850 A [Patent Document 2]
JP 2001-59221 A [Patent Document 3]
JP 2001-182058 A [Patent Document 4]
JP 2001-271346 A [Patent Document 5]
JP-A-2001-271345 [0006]
[Problems to be solved by the invention]
The underground anchor according to the above proposal has a feature that the underground anchor can be embedded very easily by using a rotary machine such as a digging column car. However, the nature of the ground (ground) where underground anchors are buried varies greatly, and the emergence of underground anchors that can be easily embedded even in the case of hard ground such as rock is awaited. It was.
[0007]
In addition, the applicant of the present invention has made a super-hole for drilling a pilot hole (front hole) for embedding the underground anchor so that the underground anchor can be embedded easily even in hard ground such as rock. A tool having a hard tip is proposed in Japanese Patent Application No. 2002-18420. However, if possible, the emergence of an underground anchor that does not require such a tool or, even if it is used, is sufficient for simple pilot hole machining. Furthermore, it has been desired that the underground anchor can be easily embedded even if the ground surface is a slope (slope) having a predetermined angle with respect to the horizontal line.
[0008]
The present invention has been made in order to meet the above requirements, the object may be a ground hard, also ground Ru can buried easily ground anchor even slope It is to provide a buried way in earth anchor.
[0009]
[Means for Solving the Problems]
Burying method of underground anchor according to the present invention, in order to achieve the above object, in a position to be buried underground anchor, and positioning holes process using a tool having a hard tip at the distal end, the ground anchor with a hammer, such as a small diameter down-the-hole hammer the positioning hole drilled has a depth that can be embedded, and slightly smaller inner diameter than the outer diameter of the helical digging edge of the ground anchor A step of drilling a pilot hole, and a step of pressing and inserting a ground anchor having a spiral excavating blade on the tip side while rotating it using a rotary machine such as a drilling column car It is characterized by consisting of .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flow sheet showing an anchor embedding method according to an embodiment. In the figure, G is the ground where the anchor A is buried, and is shown here as a slope made of rock. Hereinafter, it demonstrates according to the order shown by a flow sheet.
[0011]
(A) Positioning hole drilling step A positioning hole H1 is drilled at the buried position of the underground anchor 1 on the ground G using a tool 10 having a carbide tip at the tip. This tool 10 was previously proposed by the present applicant in Japanese Patent Application No. 2002-18420, and is attached to and detached from a rotating part M1 of an unillustrated drilling column at one end of a rod-like body 11 having a predetermined length. A mounting portion 12 that can be freely mounted is provided, the other end portion of the rod-shaped body 11 is formed at an acute angle, and the above-described carbide chip is provided at a position formed at the acute angle.
[0012]
The positioning hole H1 using the tool 10 can be easily formed by rotating the tool 10 while pressing it against the ground G. The depth of the positioning hole H1 to be opened is several tens of cm, for example, 20 to 40 cm, and the hole diameter is such that the tip of a small-diameter down-the-hole hammer 20 described later can be inserted.
[0013]
(B) Pre-drilling step After the positioning hole H1 is drilled with the tool 10, a pilot hole (front hole) for inserting the tip of the small-diameter down-the-hole hammer 20 into the hole H1 and fitting the underground anchor 1 is provided. Opened. The small-diameter down-the-hole hammer used here is an air hammer that forms a hole in a well-known rock mass. Drilling of the pilot hole H2 by the small-diameter down-the-hole hammer 20 is performed by connecting a driving portion 21 of the small-diameter down-the-hole hammer 20 to the tip of the rotating portion M1, and supplying compressed air from the compressed air source (not shown) to the driving portion 21. At the same time, it is performed by applying a rotational force at the rotating part M1.
[0014]
The depth of the pilot hole H2 drilled by the small-diameter down-the-hole hammer 20 is almost the same as the length of the underground anchor 1, and the diameter of the hole is a spiral excavating blade 2a-2d ( 2), which is slightly smaller than the largest diameter excavating blade 2d. The small-diameter down-the-hole hammer 20 used here is a commercially available hammer driven by a compressed air source. Other types of hammers may be used as long as they can make a small-diameter hole in the rock.
[0015]
(C) Underground anchor insertion process The underground anchor 1 is inserted into the pilot hole H2 opened by the small-diameter down-the-hole hammer 20. The underground anchor 1 is the same as that shown in FIG. 2 and is made of cast iron. A plurality of spiral excavating blades 2a to 2d are provided around the tapered shaft portion at a predetermined interval (in the illustrated example). 4) are provided. These digging edge 2a~2d are determined so that the top side (side connected to the rotating unit M 1) increases. And the flange is provided in the upper part side of the axial part, and the square pillar part 5 for connecting the anchor 1 to the rotation part M1 of a digging pillar car is provided in the upper center part of the flange. Is provided. A branch rod (not shown) (see (d) described later) is attached to the prism portion 5 of the underground anchor 1 and a cylindrical tool (not shown) capable of storing the branch rod i inside is attached. When the underground anchor 1 is rotated while being pressed by the rotating portion M1, the underground anchor 1 is inserted into the ground G. The depth of insertion of the underground anchor 1 is determined by the depth of the pilot hole H2, but preferably the position of the collar portion 4 is such that at least the largest-diameter spiral excavation blade 2d is in the ground. It is inserted so as to be below the surface position of the ground G.
[0016]
(D) Branch line attaching process When the underground anchor 1 is inserted into the pilot hole H2, a branch line (not shown) is attached to the upper part of the branch line rod A.
[0017]
【The invention's effect】
Burying method of ground anchor according to the invention of claim 1, in a position to be buried underground anchor, and positioning holes process using a tool having a hard tip at the distal end, the positioning hole drilled said ground anchor with a hammer, such as a small diameter down-the-hole hammer having a depth which can be embedded and process under drilling of the inner diameter slightly smaller than the outer diameter of the helical digging edge of the ground anchor If, on the pilot hole drilled, so and a step of fitting by pressing while rotating with the rotary machine Anaho Kenbashira vehicles such as underground anchor having a helical drilling blade on the distal end side, ground However, underground anchors can be easily buried even on hard ground such as rock .
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a flow sheet showing a process when carrying out an underground anchor embedding method according to an embodiment of the present invention.
2 (a) is a front view of a ground anchor according to the proposed earlier, is a top view of (b) Waso.
[Explanation of symbols]
During 1 locations anchor 1a shank 2a~2d helical digging edge 3 the drill part 4 bus section pentagonal pillar portion 6 Mounting portion
1 0 Tool 20 Small caliber down the hole hammer

Claims (1)

下記の(1)〜(3)の工程を順次行なうことを特徴とする先端側に螺旋状の掘削刃を有する地中アンカ埋設方法。
(1)前記地中アンカ埋設しようとする位置に、先端に超硬チップを有する工具を用いて位置決め用穴をあける工程。
(2)あけられた位置決め用穴に小口径ダウンザホールハンマ等のハンマで前記地中アンカが埋設できる深さを有し、かつ、その地中アンカの螺旋状の掘削刃の外径よりも僅かに小さい内径の下穴をあける工程。
(3)あけられた下穴に前記地中アンカを穴掘建柱車等の回転機械を用いて回転しながら押圧して嵌入する工程。
A method of embedding an underground anchor having a spiral excavating blade on the tip side, wherein the following steps (1) to (3) are sequentially performed .
(1) A step of forming a positioning hole at a position where the underground anchor is to be embedded by using a tool having a carbide tip at the tip.
(2) The drilling hole has a depth at which the underground anchor can be embedded with a hammer such as a small-diameter down-the-hole hammer , and is slightly smaller than the outer diameter of the spiral excavation blade of the underground anchor. under drilling process of a small inner diameter.
(3) A process of pressing and inserting the underground anchor into the drilled prepared hole while rotating using a rotary machine such as a digging pillar car .
JP2003073935A 2002-05-21 2003-03-18 How to bury underground anchors Expired - Fee Related JP4101090B2 (en)

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JP2003073935A JP4101090B2 (en) 2002-05-21 2003-03-18 How to bury underground anchors

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JP2002146053 2002-05-21
JP2003073935A JP4101090B2 (en) 2002-05-21 2003-03-18 How to bury underground anchors

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JP4101090B2 true JP4101090B2 (en) 2008-06-11

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WO2008126949A1 (en) * 2007-04-13 2008-10-23 Moojin Neotech Co., Ltd. Combined spiral-type underground anchor and rock bolt and method of producing the same
JP7412816B1 (en) 2023-01-24 2024-01-15 株式会社三共 Tip part of ground-mounted anchor type fixture

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