JP2006193909A - Self-boring bolt and method of installing the same - Google Patents

Self-boring bolt and method of installing the same Download PDF

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JP2006193909A
JP2006193909A JP2005004055A JP2005004055A JP2006193909A JP 2006193909 A JP2006193909 A JP 2006193909A JP 2005004055 A JP2005004055 A JP 2005004055A JP 2005004055 A JP2005004055 A JP 2005004055A JP 2006193909 A JP2006193909 A JP 2006193909A
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bolt
self
auger
drilling
hole
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JP4310281B2 (en
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Shiro Mizukoshi
史郎 水越
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Nishimatsu Construction Co Ltd
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Nishimatsu Construction Co Ltd
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  • Excavating Of Shafts Or Tunnels (AREA)
  • Earth Drilling (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture and install a self-boring bolt at low cost. <P>SOLUTION: This self-boring bolt is formed by fitting an auger 4 having a through hole 6 communicating with a hollow part 3 and passed to the outside at the tip 2a of a bolt body 2 having the hollow part 3. After the earth 13 is bored by excavating by the auger 4 while rotating and extruding the bolt body 2, a binder is filled from the through hole 6 into the bored hole through the hollow part 3. Thus, since an extremely expensive boring bit is not used, the self-boring bolt can be manufactured and installed at low cost. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、地山の安定化対策に用いられる自穿孔ボルトおよびその施工方法に関する。   The present invention relates to a self-drilling bolt used for measures for stabilizing natural ground and its construction method.

従来、例えば、トンネル掘削工事において天端、切羽などを安定化させるために、注入式フォアポーリングが採用されることがある。注入式フォアポーリングは、地山を穿孔ロッドで穿孔し、穿孔ロッドを引き抜いた後、中空構造の注入ボルトをその穿孔内に挿入し、固結材を注入して地山を固結する工法である。   Conventionally, for example, injecting fore-polling may be employed in order to stabilize the top edge, face, etc. in tunnel excavation work. Injection fore-polling is a method in which a natural ground is drilled with a perforated rod, and after the perforated rod is pulled out, a hollow structure injection bolt is inserted into the perforated, and a solidified material is injected to consolidate the natural ground. is there.

しかし、その穿孔の孔荒れがひどい場合には、穿孔ロッドを引き抜くことが困難となり、また注入ボルトを挿入することができなかった。そこで、孔壁が自立しないような地山では、穿孔ロッドを引き抜かずにそのまま残置して注入ボルトとする自穿孔ボルトが使用されている（例えば、非特許文献１参照。）。
鈴木雅行、他１７名，「ウレタン系注入材に関する技術資料 −注入式フォアポーリングの設計・試験方法・積算編− −空洞充填に関する留意点−」，ジェオフロンテ研究会 先行補強分科会 ウレタン開発ＷＧ，２００４年１１月３０日，ｐ．２１−３２ However, if the perforation was very rough, it was difficult to pull out the perforation rod, and the injection bolt could not be inserted. Therefore, in a natural ground where the hole wall does not stand by itself, a self-drilling bolt that is left as it is without being pulled out and is used as an injection bolt is used (for example, see Non-Patent Document 1).
Masayuki Suzuki and 17 others, “Technical data on urethane-based injecting materials-Design, test method and integration of injection-type fore-poling--Points to note regarding cavity filling-", Geofronte Study Group Advance Reinforcement Subcommittee Urethane Development WG, November 30, 2004, p. 21-32

ところで、穿孔ロッドの先端部には、地山を穿孔するための穿孔ビットが装着される。この穿孔ビットは、穿孔機により加えられる回転と打撃に耐えるため、ビット本体またはビット本体に植設されるチップが超硬合金からなり、非常に高価なものである。そして、自穿孔ボルトにおいてもこのビットが適用され、その先端部に装着されて１回限りの使用で埋設されていた。このため、従来の自穿孔ボルトの製造コスト及びその施工コストが、非常に高くなるという問題があった。   By the way, a drilling bit for drilling a natural ground is attached to the tip of the drilling rod. Since this drill bit resists rotation and blow applied by the punch, the bit body or the chip implanted in the bit body is made of cemented carbide and is very expensive. And this bit was applied also to the self-drilling bolt, and it was mounted | worn at the front-end | tip part, and was embedded by one-time use. For this reason, there existed a problem that the manufacturing cost of the conventional self-drilling bolt and its construction cost became very high.

本発明の課題は、自穿孔ボルト及びその施工のコストダウンを図ることである。   The subject of this invention is aiming at the cost reduction of a self-drilling bolt and its construction.

以上の課題を解決するため、請求項１に記載の発明の自穿孔ボルトは、例えば図１に示すように、中空部３を有するボルト本体２の先端部２ａに、前記中空部３と連通する外部への貫通孔６が形成されたオーガー４を装着していることを特徴とする。   In order to solve the above-described problems, the self-drilling bolt according to the first aspect of the present invention communicates with the hollow portion 3 at the tip 2a of the bolt body 2 having the hollow portion 3, as shown in FIG. The auger 4 in which the through-hole 6 to the outside is formed is mounted.

このように、貫通孔６が形成されたオーガー４をボルト本体２の先端部２ａに装着することにより、従来のような非常に高価な穿孔ビットを用いることなく、自穿孔ボルト１を製作することができ、その製造コストを低減することができる。   Thus, the self-drilling bolt 1 can be manufactured by using the auger 4 in which the through-hole 6 is formed on the tip 2a of the bolt body 2 without using a very expensive drill bit as in the prior art. The manufacturing cost can be reduced.

請求項２に記載の発明の自穿孔ボルトの施工方法は、例えば図２に示すように、請求項１に記載の自穿孔ボルト１を用いて、前記ボルトを回転押出ししつつ前記オーガー４で掘削して地山１３を穿孔した後、固結材１２を前記中空部３を通して前記貫通孔６から穿孔１４内に注入することを特徴とする。   The self-drilling bolt construction method according to the second aspect of the invention is excavated by the auger 4 while rotating and extruding the bolt using the self-drilled bolt 1 according to the first example as shown in FIG. Then, after drilling the natural ground 13, the solidified material 12 is injected from the through hole 6 into the perforated 14 through the hollow portion 3.

このように、オーガー４で掘削して地山１３を穿孔した後、オーガー４が装着されたボルト本体２を穿孔１４内に残置したまま、ボルト本体２の中空部３を通してオーガー４の貫通孔６から穿孔１４内に固結材１２を注入することにより、従来のように非常に高価な穿孔ビットを埋設することなく、自穿孔ボルト１を施工することができ、その施工コストを低減することができる。   Thus, after excavating with the auger 4 and drilling the natural ground 13, the through hole 6 of the auger 4 is passed through the hollow portion 3 of the bolt body 2 while leaving the bolt body 2 with the auger 4 mounted in the bore 14. By injecting the consolidated material 12 into the perforation 14, the self-drilling bolt 1 can be constructed without embedding a very expensive perforation bit as in the prior art, and the construction cost can be reduced. it can.

本発明によれば、自穿孔ボルトは、中空部を有するボルト本体の先端部において、中空部と連通する外部への貫通孔が形成されたオーガーを装着している。そして、自穿孔ボルトの施工は、ボルト本体を回転押出ししつつオーガーで掘削して地山を穿孔した後、固結材をボルト本体の中空部を通して貫通孔から穿孔内に注入する。これにより、従来のような非常に高価な穿孔ビットを用いないで済むため、自穿孔ボルト及びその施工のコストダウンを図ることができる。   According to the present invention, the self-drilling bolt is equipped with an auger in which a through hole to the outside communicating with the hollow portion is formed at the tip of the bolt body having the hollow portion. Then, the self-drilling bolt is constructed by excavating a natural body by excavating the bolt body with auger while rotating and extruding the bolt body, and then injecting the solidified material into the drilled hole from the through hole through the hollow portion of the bolt body. Thereby, since it is not necessary to use a very expensive drill bit like the conventional one, the self-drilling bolt and its construction cost can be reduced.

以下、図を参照して本発明を実施するための最良の形態を詳細に説明する。本実施の形態は、トンネル掘削工事において、自穿孔ボルトを用いて注入式フォアポーリングの施工を行い、トンネル天端、切羽などの地山の安定化を図ろうとするものである。対象となる地山は、孔荒れがひどく孔壁が自立しない砂礫層である。また、注入式フォアポーリングの穿孔長は約３ｍ、穿孔径は４５ｍｍとしている。   Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings. In the present embodiment, in tunnel excavation work, self-drilling bolts are used to perform injection-type fore-polling to stabilize ground such as the tunnel top and face. The target natural ground is a gravel layer where the hole wall is severely rough and the hole wall is not self-supporting. The perforation length of the injection type fore-poling is about 3 m and the perforation diameter is 45 mm.

まず、本実施の形態における自穿孔ボルト１について説明する。図１に示すように、自穿孔ボルト１は、ボルト本体２と、このボルト本体２の先端部２ａに装着されるオーガー４とを備えている。その他、図示しないが、アダプター、カプラーなどの付属部材を適宜備えている。   First, the self-drilling bolt 1 in the present embodiment will be described. As shown in FIG. 1, the self-drilling bolt 1 includes a bolt body 2 and an auger 4 attached to the tip 2 a of the bolt body 2. In addition, although not shown, accessory members such as adapters and couplers are appropriately provided.

ボルト本体２は、その軸方向に沿って連続する中空部３を有する円管状のものである。なお、ボルト本体２の外面は、連続したネジが形成されているなど、後述する穿孔１４内に注入される固結材１２との付着性が良いものが好ましい。また、ボルト本体２の材質は、鋼製、樹脂製などが挙げられるが、穿孔機により加えられる回転力に耐え得る材質、構造のものであればよい。   The bolt body 2 is a circular tube having a hollow portion 3 continuous along the axial direction thereof. The outer surface of the bolt body 2 is preferably one having good adhesion to the consolidated material 12 injected into the perforations 14 described later, such as a continuous screw formed. The bolt body 2 may be made of steel, resin, or the like, but may be of any material and structure that can withstand the rotational force applied by the drilling machine.

オーガー４は、鋼製のオーガー本体５とオーガー本体５の外面に突設されたスクリュー刃８とからなっている。オーガー本体５は、ほぼ円錐形状で、その底面側が開放された内空部７を有している。さらに、オーガー本体５の周壁には外部への貫通孔６が複数形成され、これらの貫通孔６は内空部７を介してボルト本体２の中空部３と連通している。   The auger 4 includes a steel auger body 5 and a screw blade 8 protruding from the outer surface of the auger body 5. The auger body 5 has a substantially conical shape, and has an inner space 7 whose bottom surface is open. Furthermore, a plurality of through-holes 6 to the outside are formed in the peripheral wall of the auger body 5, and these through-holes 6 communicate with the hollow portion 3 of the bolt body 2 through the inner space 7.

スクリュー刃８は、スパイラル状に、全体外形がオーガー本体５の形状に沿ってほぼ円錐形状に形成されている。スクリュー刃８の径は、最大となる位置でほぼ穿孔１４の径に一致する４５ｍｍとしてある。また、スクリュー刃８が形成される範囲の軸方向長さは、１５０〜２００ｍｍとしてある。   The screw blade 8 has a spiral shape and an overall outer shape that is substantially conical along the shape of the auger body 5. The diameter of the screw blade 8 is set to 45 mm which substantially coincides with the diameter of the perforation 14 at the maximum position. Moreover, the axial length of the range in which the screw blade 8 is formed is 150 to 200 mm.

オーガー４のボルト本体２への装着は、オーガー本体５の後端部５ａを、ボルト本体２の先端部２ａに嵌合して行われる。例えば、ボルト本体２の先端部２ａおよびオーガー本体５の後端部５ａにねじを形成し、両者を螺合するようにして良い。   The auger 4 is attached to the bolt body 2 by fitting the rear end portion 5 a of the auger body 5 to the tip portion 2 a of the bolt body 2. For example, a screw may be formed at the front end portion 2a of the bolt body 2 and the rear end portion 5a of the auger main body 5, and both may be screwed together.

次に、自穿孔ボルト１の施工方法について説明する。まず、自穿孔ボルト１の後端側にアダプターを介してドリルジャンボなどの穿孔機を連結し（図示せず）、図２（ａ）に示すように、自穿孔ボルト１を回転押出ししつつ、先端部２ａのオーガー４で掘削して、地山１３を穿孔する。   Next, the construction method of the self-drilling bolt 1 will be described. First, a drilling machine such as a drill jumbo is connected to the rear end side of the self-drilling bolt 1 via an adapter (not shown), and as shown in FIG. The natural ground 13 is drilled by excavating with the auger 4 at the tip 2a.

地山１３を穿孔する際には、穿孔機にコンプレッサーが装備され、水、空気などの加圧流体をボルト本体２に供給できるようになっている（図示せず）。この加圧流体は、ボルト本体２の中空部３、オーガー４の内空部７を通って、貫通孔６から噴出される。噴出された加圧流体は、オーガー４による掘削で発生した繰粉などを後方に送り出し、穿孔１４の孔口へと排出することができるようになっている。   When drilling the natural ground 13, the drilling machine is equipped with a compressor so that pressurized fluid such as water and air can be supplied to the bolt body 2 (not shown). The pressurized fluid is ejected from the through hole 6 through the hollow portion 3 of the bolt body 2 and the inner space portion 7 of the auger 4. The jetted pressurized fluid is configured so that the dusting and the like generated by excavation by the auger 4 can be sent backward and discharged to the hole of the perforation 14.

地山１３を所定の深さまで穿孔し、必要に応じ穿孔１４内を洗浄して、自穿孔ボルト１から穿孔機を取り外すと、図２（ｂ）に示す状態となる。そして、図２（ｃ）に示すように、固結材１２のリークを防止するために、穿孔１４の口元１４ａとボルト本体２との間隙をコーキングする。口元１４ａのコーキング９が完了したら、図２（ｄ）に示すように、自穿孔ボルト１の後端側にミキシングユニット１０などをセットする。   When the ground 13 is drilled to a predetermined depth, the inside of the drill 14 is washed as necessary, and the drilling machine is removed from the self-drilling bolt 1, the state shown in FIG. Then, as shown in FIG. 2 (c), the gap between the mouth 14 a of the hole 14 and the bolt body 2 is caulked in order to prevent leakage of the consolidated material 12. When the caulking 9 of the mouth 14a is completed, the mixing unit 10 and the like are set on the rear end side of the self-drilling bolt 1 as shown in FIG.

そして、図２（ｅ）に示すように、ミキシングユニット１０のバルブ１１を開き、前述した加圧流体と同じ経路を通って、貫通孔６から固結材１２を注入する。固結材１２は、穿孔１４内を順次口元１４ａに向かって押し出され、地山１３内の亀裂１５へも浸透して地山１３を固結させるとともに、自穿孔１４ロックボルトを定着させる。固結材１２としては、セメント系、ウレタン系などの周知の注入材を用いることができる。   Then, as shown in FIG. 2E, the valve 11 of the mixing unit 10 is opened, and the consolidated material 12 is injected from the through hole 6 through the same path as the pressurized fluid described above. The consolidated material 12 is sequentially pushed through the perforations 14 toward the mouth 14a, penetrates into the cracks 15 in the ground 13 and consolidates the ground 13 and fixes the self-perforated 14 lock bolt. As the caking material 12, a well-known injection material such as cement-based or urethane-based can be used.

なお、以上の実施の形態においては、自穿孔ボルト１を、トンネル掘削工事におけるトンネル天端、切羽などの安定化対策に用いたが、本発明はこれに限定されるものではなく、法面などの安定化対策として用いても良い。また、ロストビットタイプのＡＧＦ工法（注入式長尺先受工法）にも適用可能である。また、オーガー４、スクリュー刃８等の形状、貫通孔６の位置、数、その他、具体的な細部構造等について適宜に変更可能であることは勿論である。   In the above embodiment, the self-drilling bolt 1 is used for stabilization measures such as a tunnel top and a face in tunnel excavation work. However, the present invention is not limited to this, and a slope or the like is used. It may be used as a stabilization measure. Moreover, it is applicable also to a lost bit type AGF method (injection type long tip receiving method). Of course, the shape of the auger 4, the screw blade 8, etc., the position and number of the through-holes 6, and other specific detailed structures can be appropriately changed.

本発明を適用した一実施の形態の自穿孔ボルトを示す側面図（一部断面図）である。It is a side view (partial sectional view) showing a self-drilling bolt of an embodiment to which the present invention is applied. 本発明を適用した一実施の形態の自穿孔ボルトを用いたフォアポーリングの施工手順を説明する図である。It is a figure explaining the construction procedure of fore polling using the self-drilling bolt of one Embodiment to which this invention is applied.

符号の説明Explanation of symbols

１ 自穿孔ボルト
２ ボルト本体
２ａ 先端部
３ 中空部
４ オーガー
５ オーガー本体
５ａ 後端部
６ 貫通孔
７ 内空部
８ スクリュー刃
９ コーキング
１０ ミキシングユニット
１１ バルブ
１２ 固結材
１３ 地山
１４ 穿孔
１４ａ 口元
１５ 亀裂 DESCRIPTION OF SYMBOLS 1 Self-drilling bolt 2 Bolt main body 2a Tip part 3 Hollow part 4 Auger 5 Auger main part 5a Rear end part 6 Through-hole 7 Inner space part 8 Screw blade 9 Coking 10 Mixing unit 11 Valve 12 Solidification material 13 Ground 14 Punch 14a Mouth 15 Crack

Claims (2)

中空部を有するボルト本体の先端部に、前記中空部と連通する外部への貫通孔が形成されたオーガーを装着していることを特徴とする自穿孔ボルト。   A self-drilling bolt, wherein an auger in which a through-hole to the outside communicating with the hollow portion is formed is attached to a tip portion of a bolt body having a hollow portion. 請求項１に記載の自穿孔ボルトを用いて、前記ボルトを回転押出ししつつ前記オーガーで掘削して地山を穿孔した後、固結材を前記中空部を通して前記貫通孔から穿孔内に注入することを特徴とする自穿孔ボルトの施工方法。   The self-drilling bolt according to claim 1 is used to excavate the natural ground by excavating the bolt with the auger while rotating and extruding the bolt, and then injecting the consolidated material into the drilled hole from the through hole through the hollow portion. A self-drilling bolt construction method characterized by this.
JP2005004055A 2005-01-11 2005-01-11 Self-drilling bolt and its construction method Expired - Fee Related JP4310281B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102076246B1 (en) * 2019-07-15 2020-02-11 (주)우진이앤씨 Anchor hole boring method to emit the crushed slime and the injected water by forming the negative pressure on the slope of the cone-shaped bit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102076246B1 (en) * 2019-07-15 2020-02-11 (주)우진이앤씨 Anchor hole boring method to emit the crushed slime and the injected water by forming the negative pressure on the slope of the cone-shaped bit

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