JPH10184296A - Execution method of bolt for reinforcing bedrock - Google Patents

Execution method of bolt for reinforcing bedrock

Info

Publication number
JPH10184296A
JPH10184296A JP35111596A JP35111596A JPH10184296A JP H10184296 A JPH10184296 A JP H10184296A JP 35111596 A JP35111596 A JP 35111596A JP 35111596 A JP35111596 A JP 35111596A JP H10184296 A JPH10184296 A JP H10184296A
Authority
JP
Japan
Prior art keywords
bolt
ground
steel pipe
drilling
injected
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.)
Granted
Application number
JP35111596A
Other languages
Japanese (ja)
Other versions
JP3100347B2 (en
Inventor
Toshinori Matsuzaki
利宣 松崎
Kyozo Suyama
恭三 須山
Iwao Nakahara
巌 中原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Obayashi Corp
Japan Foundation Engineering Co Ltd
Original Assignee
Obayashi Corp
Japan Foundation Engineering Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Obayashi Corp, Japan Foundation Engineering Co Ltd filed Critical Obayashi Corp
Priority to JP08351115A priority Critical patent/JP3100347B2/en
Publication of JPH10184296A publication Critical patent/JPH10184296A/en
Application granted granted Critical
Publication of JP3100347B2 publication Critical patent/JP3100347B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Excavating Of Shafts Or Tunnels (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

PROBLEM TO BE SOLVED: To fix a long-sized bolt for reinforcing a bedrock easily into a ground even to the bedrock, in which an excavated pit is incapable of self-supporting. SOLUTION: In the execution method, the bolt 10 for reinforcing the bedrock such as a cable bolt 18 is fixed and installed into a ground. A steel pipe 12, in which a diameter-expanding drill but 13 is mounted at a front end, is drilled and driven into the bedrock while excavated soil and sand are removed by injecting excavating water into the steel pipe 12 and passing excavated soil and sand into a clearance 15 on the outside of the steel pipe 12 together with the injected water at that time, the cable bolt 18 is inserted into the steel pipe 12 when the steel pipe 12 reaches specified depth, and the front end of the cable bolt 18 is retained to the diameter-expanding drill bit 13. The diameter- expanding drill bit 13 is left into a drilled excavated pin 25, and the steel pipe 12 is extracted while an injecting solidifying material 14 is injected into the excavated pin 25, thus fixing the bolt 10 for reinforcing the bedrock into the bedrock through the injecting solidifying material 14.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】この発明は、地山補強用ボル
トの施工方法に関し、特に、ケーブルボルトやロックボ
ルト等の地山補強用ボルトを地中に定着設置するための
地山補強用ボルトの施工方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for installing a ground reinforcement bolt, and more particularly, to a ground reinforcement bolt for fixing a ground reinforcement bolt such as a cable bolt or a lock bolt in the ground. Concerning the construction method.

【0002】[0002]

【従来の技術】例えば道路トンネルや鉄道トンネル等の
大断面のトンネルを構築する場合において、トンネル掘
削に伴い発生する地山のゆるみを抑制させたり、地山改
良効果が期待される施工方法として、地山を削孔すると
ともに、削孔形成した掘削孔にロックボルトやパイブボ
ルト等の地山補強用ボルトを挿入し、しかる後に地山補
強用ボルトの周囲の隙間に注入固化材を注入して固化さ
せることにより、当該補強用ボルトによって地山を強化
する構造を、トンネルの切羽部分の地盤や周囲の地盤に
形成してゆくものがある。
2. Description of the Related Art For example, when constructing a tunnel having a large cross section such as a road tunnel or a railway tunnel, as a construction method expected to suppress the loosening of the ground caused by tunnel excavation and to improve the ground, While drilling the ground, insert rock reinforcing bolts, pipe bolts, etc. into the drilled holes, and then inject solidified material into the gap around the ground reinforcing bolts and solidify. In some cases, a structure for strengthening the ground with the reinforcing bolts is formed on the ground at the face of the tunnel or in the surrounding ground.

【0003】そして、特に、削孔後に孔が自立しない不
良地山に対して、地山補強用ボルトを挿入配置する作業
を行う方法の一つとして、自穿孔ボルトを用いたものが
知られており、かかる自穿孔ボルトによれば、先端に穿
孔ビットを有するボルトに回転と打撃とを加えるととも
に、掘削孔の孔壁の安定のために気泡水などを削孔水と
して適宜使用しながら削孔作業を行ない、かかる削孔作
業が終了したら、ボルトをそのまま地山に残しておい
て、ボルトのパイプ形状を利用して注入固化材を注入
し、当該地山補強用ボルトを地中に定着固定するように
するものである。
[0003] In particular, as a method of inserting and arranging a ground reinforcement bolt into a defective ground in which a hole is not self-supporting after drilling, a method using a self-drilling bolt is known. According to such a self-drilling bolt, the bolt having a drill bit at the tip is rotated and hit, and drilled while appropriately using bubbled water or the like as drilling water to stabilize the hole wall of the drilled hole. After the drilling work is completed, leave the bolts in the ground and inject the solidified material using the pipe shape of the bolts, and fix the ground reinforcement bolts in the ground. It is something to do.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、上記従
来の自穿孔ボルトにより地山補強用ボルトを地中に定着
固定する方法によれば、特に、不良地山に対して例えば
10m以上の長尺の補強用ボルトを設置しようとする場
合には、自穿孔ボルトの削孔設置作業が困難になるとと
もに、その作業に長時間を要することになるという課題
があった。
However, according to the conventional method of fixing and fixing the ground reinforcing bolt in the ground by the self-drilling bolt described above, particularly, a long ground having a length of, for example, 10 m or more with respect to a defective ground is required. When the reinforcement bolt is to be installed, there is a problem that the work of drilling the self-drilling bolt becomes difficult and the operation requires a long time.

【0005】すなわち、削孔した掘削孔が自立しないた
め、自穿孔ボルトが周囲の地山から締め付けられること
になって、削孔トルクが不足することになるとともに、
削孔作業に伴なう掘削土砂の排出が困難になるという課
題があった。
That is, since the drilled hole is not self-supporting, the self-drilling bolt is tightened from the surrounding ground, and the drilling torque becomes insufficient.
There was a problem that it became difficult to discharge the excavated earth and sand accompanying the drilling work.

【0006】また、長尺の補強用ボルトの設置には、自
穿孔ボルトを2〜3本以上継ぎ足して削孔打設作業を行
う必要があるが、かかる自穿孔ボルトを継ぎ足すための
スリーブは、自穿孔ボルトの径よりもその径が大きいも
のであるため、このスリーブが抵抗となって削孔打設作
業がさらに困難になるという課題があった。
In addition, when installing a long reinforcing bolt, it is necessary to add two or more self-drilling bolts to perform drilling work. However, a sleeve for adding such self-drilling bolts is required. However, since the diameter of the self-drilling bolt is larger than the diameter of the self-drilling bolt, there is a problem that the sleeve acts as a resistance and the drilling operation becomes more difficult.

【0007】そこで、この発明は、このような従来の課
題に着目してなされたもので、掘削孔が自立しない地山
に対しても、長尺の地山補強用ボルトを地中に容易に定
着固定することのできる地山補強用ボルトの施工方法を
提供することを目的とするものである。
Therefore, the present invention has been made in view of such a conventional problem, and a long ground reinforcement bolt can be easily placed underground even on a ground where a drilling hole is not self-supporting. It is an object of the present invention to provide a method of constructing a ground reinforcement bolt that can be fixed and fixed.

【0008】[0008]

【課題を解決するための手段】この発明は、上記目的を
達成するためになされたもので、その要旨は、ケーブル
ボルトやロックボルト等の地山補強用ボルトを地中に定
着設置するための施工方法であって、先端に拡径穿孔ビ
ットを装着した鋼管を、これの内部に削孔水を注入して
掘削土砂をこの注入水とともに前記鋼管の外側の隙間を
通過させることにより排除しつつ地山中に削孔打設し、
前記鋼管が所定の深度に達したら、前記鋼管内に地山補
強用ボルトをその先端まで挿入し、しかる後に、削孔し
た掘削孔に前記拡径穿孔ビットを残置するようにして前
記鋼管を引き抜くとともに前記掘削孔に注入固化材を注
入することにより、前記地山補強用ボルトを前記注入固
化材を介して地山中に定着固定することを特徴とする地
山補強用ボルトの施工方法にある。
SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the gist of the invention is to fix a ground reinforcement bolt such as a cable bolt or a lock bolt in the ground. A construction method, wherein a steel pipe having a large-diameter drilling bit attached to its tip is removed by injecting drilling water into the inside of the steel pipe and passing excavated earth and sand together with the injected water through a gap outside the steel pipe. Drilling holes in the ground,
When the steel pipe reaches a predetermined depth, a ground reinforcement bolt is inserted into the steel pipe to its tip, and thereafter, the steel pipe is pulled out so as to leave the enlarged diameter drilling bit in the drilled hole. The method further comprises fixing the ground reinforcement bolt in the ground through the injected solidified material by injecting the injected solidified material into the excavation hole.

【0009】また、この発明の地山補強用ボルトの施工
方法によれば、地山補強用ボルトとして内部に中空通路
を有するものを使用し、この中空通路を介して掘削孔内
の空気抜きを行ないながら前記掘削孔へ注入固化材を注
入する作業を行なうようにすることが好ましい。
According to the method of constructing a ground reinforcement bolt of the present invention, a ground reinforcement bolt having a hollow passage therein is used, and air is removed from the borehole through the hollow passage. It is preferable to perform the operation of injecting the solidified material into the excavation hole while doing so.

【0010】なお、上記記載において拡径穿孔ビットと
は、その削孔径が、少なくとも後続する鋼管の径よりも
大きくなるように構成された穿孔ビットを意味するもの
である。
[0010] In the above description, the enlarged diameter drill bit means a drill bit configured such that the drill hole diameter is at least larger than the diameter of the succeeding steel pipe.

【0011】そして、この発明の地山補強用パイプボル
トの施工方法によれば、先端に拡径穿孔ビットを装着し
た鋼管に打撃や回転を加えながら削孔作業が行われる
が、鋼管は、相当の直径及び肉厚を有することにより、
地中に打設挿入する際の打撃力や回転力に十分に耐え得
る強度や断面を備え、また、拡径穿孔ビットにより削孔
された孔壁と鋼管との間には隙間が保持されるので、こ
の隙間を介して掘削土砂を排除しつつスムースに地中に
打設挿入されてゆくことになる。
According to the method for constructing a ground reinforcement pipe bolt of the present invention, a drilling operation is performed while applying a blow or rotation to a steel pipe having an enlarged diameter drilling bit attached to its tip. By having a diameter and thickness of
Equipped with strength and cross section enough to withstand the impact force and rotational force when cast and inserted into the ground, and a gap is maintained between the hole wall drilled by the enlarged diameter drill bit and the steel pipe Therefore, the excavated earth and sand is smoothly removed and inserted into the ground through this gap.

【0012】また、鋼管は、相当の直径及び肉厚を有す
ることにより、鋼管を継ぎ足す場合でも、鋼管よりも径
の大きなスリーブを特に必要とすることなく、鋼管の断
面内において連結構造を容易に構成することができるこ
とから、この連結部分が抵抗となって削孔打設作業を困
難にすることがない。
Further, since the steel pipe has a considerable diameter and a large wall thickness, even when steel pipes are added, a connecting structure can be easily formed in the cross section of the steel pipe without particularly requiring a sleeve having a larger diameter than the steel pipe. Therefore, the connecting portion does not act as a resistance to make the drilling operation difficult.

【0013】さらに、地山補強用ボルトとして内部に中
空通路を有するものを使用し、この中空通路を介して掘
削孔内の空気抜きを行ないながら前記掘削孔へ注入固化
材を注入する作業を行なうようにすれば、注入固化材を
掘削孔内へ隙間なく注入充填することを容易にして、地
山補強用ボルトの地山への強固な定着状態を容易に確保
することが可能になる。
Further, a bolt having a hollow passage therein is used as a ground reinforcing bolt, and an operation of injecting the injected solidified material into the drilling hole is performed while removing air from the drilling hole through the hollow passage. By doing so, it is easy to inject and fill the injected solidification material into the excavation hole without any gap, and it is possible to easily secure a strong fixing state of the ground reinforcing bolt to the ground.

【0014】[0014]

【発明の実施の形態】次に、この発明の好ましい実施の
形態すなわち一実施例について、添付図面を参照しつつ
詳細に説明する。この実施例にかかる地山補強用ボルト
の施工方法は、図1に示すように、例えばトンネル工事
の補助工法としての長尺の先受け工法において採用され
たもので、この先受け工法によれば、各種のトンネル現
場で用いられるドリルジャンボ20を使用して、後述す
るように、10m程度の長さの鋼管12をトンネル11
の周囲に位置するようにして切羽面の前方の地山に向け
て挿入打設する作業などを行うことにより、切羽面の掘
削作業に先立って、周囲の地山に定着固定された地山補
強用ボルト10によって、周囲の地盤を支持する長尺の
先受け構造を形成するものである。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention, that is, an embodiment will be described in detail with reference to the accompanying drawings. As shown in FIG. 1, the construction method of the ground reinforcement bolt according to this embodiment is, for example, employed in a long precedent method as an auxiliary method of tunnel construction. Using a drill jumbo 20 used in various tunnel sites, a steel pipe 12 having a length of about 10 m
Before the excavation work on the face, the ground reinforcement fixed to the surrounding ground by performing work such as inserting and placing the rock toward the ground in front of the face The long bolt receiving structure for supporting the surrounding ground is formed by the bolt 10.

【0015】また、この実施例によれば、対象となる地
盤が、ドリルジャンボ20により穿孔された孔が自立し
ないような地質の不良地山であるため、この発明の施工
方法によって、地山補強用ボルトの設置及び定着作業が
行われることになる。
Further, according to this embodiment, since the target ground is a ground with poor geology such that the hole drilled by the drill jumbo 20 does not stand on its own, the construction method of the present invention makes it possible to reinforce the ground. The installation and fixing work of the bolts are performed.

【0016】そして、この実施例の施工方法によれば、
まず、ドリルジャンボ20を用いて、図2(a)に示す
ように、先端に穿孔ビット13が取り付けられた中空の
鋼管12を、これの内部に削孔水を注入し、穿孔ビット
13によって掘削された土砂を注入した削孔水とともに
鋼管12の外側に形成された隙間15を介して排出しな
がら、いわゆる外返し排土により掘削土砂を排除しつつ
地山中に挿入打設して行く。
According to the construction method of this embodiment,
First, as shown in FIG. 2 (a), a hollow steel pipe 12 having a drill bit 13 attached to the tip thereof is drilled with drilling water using a drill jumbo 20, and drilled by the drill bit 13. While discharging the excavated soil together with the drilling water into which the injected earth and sand have been injected through the gap 15 formed outside the steel pipe 12, the excavated earth and sand is removed and poured into the ground while so-called inverted earth removal.

【0017】ここで、鋼管12は、例えば直径114.
3mmの中空のものであって、2〜3m程度の長さのも
のを複数本継ぎ足しながら打ち込んでゆくことになる
が、このような鋼管12の連結部分を、例えば当該鋼管
12の後端部内周面に沿って形成された嵌合凹部に、後
続する鋼管12の先端部内周面に沿って形成された嵌合
凸部を螺合すること等によって構成して、鋼管12を、
その外径を拡大することなく連結してゆくことになる。
The steel pipe 12 has a diameter of, for example, 114 mm.
A 3 mm hollow body having a length of about 2 to 3 m will be driven while adding a plurality of pipes. Such a connecting portion of the steel pipe 12 is formed, for example, at the rear end inner circumference of the steel pipe 12. The steel pipe 12 is formed by screwing a fitting projection formed along the inner peripheral surface of the tip of the succeeding steel pipe 12 into a fitting recess formed along the surface, and the like.
It will be connected without expanding the outer diameter.

【0018】一方、鋼管12の先端に取り付けられる穿
孔ビット13としては、例えば超硬チップの付いた一般
の穿孔ビットを改良して使用することができ、またこの
穿孔ビット13によれば、図3に拡大して示すように、
先端の切削面が拡径して、その削孔径が、鋼管12の断
面の径より大きくなるように構成されている。
On the other hand, as the drill bit 13 attached to the tip of the steel pipe 12, for example, a general drill bit with a cemented carbide tip can be used by being improved. According to the drill bit 13, FIG. As shown enlarged in
The diameter of the cut surface at the tip is enlarged so that the diameter of the hole becomes larger than the diameter of the cross section of the steel pipe 12.

【0019】また、この穿孔ビット13には、その後部
に、鋼管12の先端部分を嵌め込むための嵌合凹部16
が形成さていて、この嵌合凹部16には、図5に示すよ
うな断面形状の、鋼管12の先端部分に形成された嵌合
凸部17が嵌合当接して(図4参照)、鋼管12が穿孔
ビット13に対して後方に引き抜き自在に連結している
ことになる。
The drill bit 13 has a fitting recess 16 at its rear end for fitting the tip of the steel pipe 12.
The fitting concave portion 16 is fitted with a fitting convex portion 17 having a sectional shape as shown in FIG. 5 and formed at the distal end portion of the steel pipe 12 (see FIG. 4). The steel pipe 12 is connected to the drill bit 13 so as to be able to be pulled out rearward.

【0020】さらに、この穿孔ビット13には、後述す
るケーブルボルト18を鋼管12の内部に挿入する際
に、ケーブルボルト18の先端を穿孔ビット13に係止
固定するための3枚の固定羽19が、穿孔ビット13の
内部に形成された弧状のガイド孔21に沿って、スライ
ド可能に取り付けられている。
Further, when the cable bolt 18 described later is inserted into the steel pipe 12, three fixed wings 19 for locking the tip of the cable bolt 18 to the drill bit 13 are inserted into the drill bit 13. Are slidably mounted along an arc-shaped guide hole 21 formed inside the drill bit 13.

【0021】すなわち、これらの固定羽19は、ガイド
孔21の曲率と同様の曲率で湾曲する湾曲プレート23
の外周面に鋸歯状の係止片22を取り付けてなるもの
で、穿孔ビット13の中心部分から等角度間隔で放射方
向3方向に延長し、穿孔ビット13による削孔作業中に
おいては当該穿孔ビット13に対する固定状態を保持す
る。一方、後述するケーブルボルト18の設置作業を行
なう際に、ケーブルボルト18が3枚の固定羽19の中
心部分に挿入されると、その押圧力によって、これらが
湾曲するガイド孔21に沿って穿孔ビット13の外方に
押し出されるとともに、挿入されたケーブルボルト18
の先端部分を締め付けるようにしながら係止片22をケ
ーブルボルト18に食い込ませ、これによって、ケーブ
ルボルト18を引き抜くことができないように、その先
端を穿孔ビット13に強固に係止固定することができる
ようになっている。
That is, these fixed wings 19 are curved plates 23 which are curved with a curvature similar to that of the guide holes 21.
Of the drill bit 13 extending in three radial directions at equal angular intervals from the central portion of the drill bit 13, and during drilling work by the drill bit 13, 13 is kept fixed. On the other hand, when the cable bolts 18 are inserted into the central portions of the three fixed wings 19 during the installation work of the cable bolts 18 described later, the cable bolts 18 are pierced along the curved guide holes 21 by the pressing force. The cable bolt 18 pushed out of the bit 13 and inserted
The locking piece 22 is cut into the cable bolt 18 while tightening the tip of the cable bolt 18, whereby the tip can be firmly locked and fixed to the drill bit 13 so that the cable bolt 18 cannot be pulled out. It has become.

【0022】なお、この実施例では、穿孔ビット13
は、ケーブルボルト18の先端を係止固定するため固定
羽19を備えているが、この発明は、必ずしもケーブル
ボルト18の先端を穿孔ビット13に係止固定する必要
はなく、他の実施例として、例えば穿孔ビット13の中
心部に設けた盲孔にケーブルボルトの先端を食い込ませ
て係合させるようにしてもよい。
In this embodiment, the drill bit 13
Is provided with a fixing wing 19 for locking and fixing the tip of the cable bolt 18. However, in the present invention, it is not always necessary to lock and fix the tip of the cable bolt 18 to the drill bit 13; For example, the distal end of the cable bolt may be engaged with a blind hole provided at the center of the drill bit 13 by biting.

【0023】また、穿孔ビット13に単にケーブルボル
ト18の先端を当接するようにして、ケーブルボルト1
8を鋼管12内に挿入配置することもできる。
Further, the cable bolt 1 is so arranged that the tip of the cable bolt 18 is simply brought into contact with the drill bit 13.
8 can also be inserted and arranged in the steel pipe 12.

【0024】そして、この実施例によれば、このような
ドリルジャンボ20を用いた鋼管12の挿入打設作業時
においては、相当の強度や断面を備えた鋼管12によっ
て削孔した孔壁面を強固に防護しつつ、鋼管12に打撃
力や回転力を加えるとともに、いわゆる外返し排土によ
って隙間15から掘削土砂を排除しつつ、掘削孔25を
削孔しながら容易に鋼管14の打設作業を行ってゆくこ
とができる。
According to this embodiment, at the time of inserting and placing the steel pipe 12 using the drill jumbo 20, the hole wall surface drilled by the steel pipe 12 having a considerable strength and a cross section is firmly formed. In addition to applying a striking force or a rotating force to the steel pipe 12 while protecting the steel pipe 12, the excavated soil is removed from the gap 15 by so-called inverted discharge, and the steel pipe 14 is easily driven while drilling the drill hole 25. You can go.

【0025】また、鋼管12はその連結部分においてそ
の外径が拡大していないため、当該連結部分がこのよう
な挿入打設作業の妨げとなることがない。
Further, since the outer diameter of the steel pipe 12 is not enlarged at the connecting portion, the connecting portion does not hinder such insertion and casting work.

【0026】このようにして鋼管14を地中に挿入打設
したら、図2(b)に示すように、この鋼管12の内部
に、地山補強用ボルト10としてのケーブルボルト18
を挿入設置する作業を行なう。すなわち、かかる設置作
業は、鋼管12によって周囲を覆われた掘削孔25内に
おいて容易に行うことができるとともに、上述の穿孔ビ
ット13に取り付けた固定羽19の作用によって、挿入
されたケーブルボルト18の先端が、穿孔ビット13に
容易に係止固定されることになる。
When the steel pipe 14 is inserted and cast into the ground in this way, as shown in FIG. 2B, a cable bolt 18 serving as a ground reinforcement bolt 10 is provided inside the steel pipe 12.
Perform the work of inserting and installing. That is, such installation work can be easily performed in the excavation hole 25 whose periphery is covered by the steel pipe 12, and the action of the fixed wings 19 attached to the above-mentioned drill bit 13 allows the inserted cable bolt 18 to be inserted. The tip is easily locked and fixed to the drill bit 13.

【0027】ここで、ケーブルボルト18は、図6にそ
の断面形状を示すように、中空のパイブ部材28の周囲
に、複数の鋼線26を撚って形成したワイヤ27を複数
巻き付けて構成されるものである。
As shown in FIG. 6, the cable bolt 18 is formed by winding a plurality of wires 27 formed by twisting a plurality of steel wires 26 around a hollow pipe member 28. Things.

【0028】そして、鋼管12の内部にケーブルボルト
18を設置する作業が終了したら、図2(c)に示すよ
うに、鋼管12により削孔した掘削孔25に穿孔ビット
13を残置するようにして鋼管12を引き抜くととも
に、掘削孔25に注入固化材14を注入する作業を行な
う。
When the work of installing the cable bolt 18 inside the steel pipe 12 is completed, as shown in FIG. 2C, the drill bit 13 is left in the drill hole 25 drilled by the steel pipe 12. The steel pipe 12 is pulled out and the work of injecting the solidified material 14 into the excavation hole 25 is performed.

【0029】ここで、かかる鋼管12の引抜き作業を行
う際に、ケーブルボルト18の先端が掘削孔25の先端
に残置された穿孔ビット13に係止されていることによ
り、ケーブルボルト18が鋼管12に引きづられて掘削
孔25から抜け出ることがない。
Here, when the steel pipe 12 is pulled out, the cable bolt 18 is locked by the drill bit 13 remaining at the tip of the drilling hole 25 so that the cable bolt 18 is connected to the steel pipe 12. And does not fall out of the excavation hole 25.

【0030】また、注入固化材14の掘削孔25への注
入作業は、例えばセメント系あるいはウレタン系の注入
固化材14を圧送することによって容易に行なうことが
できるが、掘削孔25に挿入設置されたケーブルボルト
18が、中央のパイブ部材28による中空通路を有する
ので、このパイブ部材28を介して掘削孔25内の空気
抜きを行ないながら注入固化材14を注入する作業が行
なわれることにより、注入固化材14が掘削孔25内及
び削孔作業や鋼管12の引き抜き作業によって乱された
周囲の地山の隙間に容易に注入充填されて、地山補強ボ
ルト10の地山への強固な定着状態が確保されることに
なる。
The work of injecting the solidified material 14 into the excavation hole 25 can be easily performed by, for example, feeding the cemented or urethane-based injected solidified material 14 by pressure. Since the cable bolt 18 has a hollow passage formed by the central pipe member 28, the operation of injecting the injected solidified material 14 while bleeding air from the excavation hole 25 through the pipe member 28 is performed. The material 14 is easily injected and filled into the excavation hole 25 and the gap between the surrounding grounds disturbed by the drilling operation and the drawing operation of the steel pipe 12, and the solid fixing state of the ground reinforcement bolt 10 to the ground is improved. Will be secured.

【0031】なお、かかる注入固化材14の注入作業
は、鋼管12を引き抜きながら行うことができる他、鋼
管を引き抜いた後に行ってもよい。
The operation of injecting the solidified injection material 14 can be performed while pulling out the steel pipe 12, or may be performed after pulling out the steel pipe.

【0032】そして、このようにして隙間なく掘削孔2
5に注入充填された注入固化材14が固化すると、対象
となる地盤が不良地山である場合であっても、この注入
固化材14を介して、ケーブルボルト18が地山補強用
ボルト10として周囲の地山に密着し、地中に強固に定
着固定されることになる。
And, in this way, the excavation hole 2 has no gap.
When the injected solidified material 14 injected and filled into the solidified material 5 is solidified, the cable bolt 18 is used as the ground reinforcing bolt 10 via the injected solidified material 14 even if the target ground is a defective ground. It closely adheres to the surrounding ground and is firmly fixed and fixed in the ground.

【0033】なお、この発明は、上記実施例の実施の態
様のものに限定されるものではなく、各請求項に記載さ
れた構成の範囲内において、種々に変更して採用するこ
とができる。例えば、この発明の地山補強用ボルトの施
工方法は、先受け工法にのみならず、地山補強用ボルト
を地山に削孔打設するその他の種々の工法においても採
用することができる。
The present invention is not limited to the embodiment of the above embodiment, but can be variously modified and adopted within the scope of the structure described in each claim. For example, the method of constructing the ground reinforcement bolt of the present invention can be employed not only in the pre-installation method but also in various other construction methods of drilling the ground reinforcement bolt into the ground.

【0034】また、地山補強用ボルト10としては、必
ずしも中空通路を有するケーブルボルトを用いる必要は
なく、例えば鉄筋棒やその他の鋼棒、あるいは合成樹脂
製の部材を地山補強用ボルトとして使用することもでき
る。
It is not necessary to use a cable bolt having a hollow passage as the ground reinforcement bolt 10. For example, a reinforcing rod or other steel rod or a member made of a synthetic resin is used as the ground reinforcement bolt. You can also.

【0035】[0035]

【発明の効果】以上詳細に説明したように、この発明の
地山補強用ボルトの施工方法によれば、先端に拡径穿孔
ビットを装着した鋼管を地山中に削孔打設し、打設した
鋼管内に地山補強用ボルトをその先端まで挿入し、しか
る後に、掘削孔に拡径穿孔ビットを残置するようにして
鋼管を引き抜くとともに前記掘削孔に注入固化材を注入
することにより構成されるので、掘削孔が自立しない地
山に対しても、長尺の地山補強用ボルトを地中に容易に
定着固定することができる。
As described in detail above, according to the method for installing a ground reinforcement bolt of the present invention, a steel pipe having a large-diameter drilling bit attached to the tip is drilled into the ground, and is driven. Into the excavated hole, and then pull out the steel tube so as to leave the enlarged diameter drilling bit in the excavated hole and inject the solidified material into the excavated hole. Therefore, even when the excavation hole is not self-supporting, the long ground reinforcement bolt can be easily fixed and fixed in the ground.

【0036】また、地山補強用ボルトとして内部に中空
通路を有するものを使用し、この中空通路を介して掘削
孔内の空気抜きを行ないながら掘削孔へ注入固化材を注
入する作業を行なうようにすれば、注入固化材を掘削孔
内へ隙間なく注入充填することを容易にして、地山補強
用ボルトの地山への強固な定着状態を容易に確保するこ
とができる。
Further, a bolt having a hollow passage therein is used as a ground reinforcement bolt, and the work of injecting the injected solidified material into the drill hole is performed while bleeding air from the hole through the hollow passage. By so doing, it is easy to inject and fill the injected solidification material into the excavation hole without any gap, and it is possible to easily secure a firm fixing state of the ground reinforcing bolt to the ground.

【図面の簡単な説明】[Brief description of the drawings]

【図1】この発明の一実施例にかかる地山補強用ボルト
の施工方法を採用して行われる先受け工法の施工状況を
説明する縦断面図である。
FIG. 1 is a vertical cross-sectional view for explaining a construction state of a front receiving construction method performed by employing a construction method of a ground reinforcement bolt according to an embodiment of the present invention.

【図2】(a)は、鋼管を地山に挿入打設する状況を説
明する拡大断面図、(b)は、挿入打設した鋼管の内部
にに地山補強用ボルトを設置する状況を説明する拡大断
面図、(c)は、挿入打設した鋼管を引き抜くととも掘
削孔に注入固化材を注入して地山補強用ボルトを地中に
定着固定する状況を説明する拡大断面図である。
FIG. 2A is an enlarged cross-sectional view illustrating a situation where a steel pipe is inserted and cast into a ground pile, and FIG. 2B is a view illustrating a situation where a ground reinforcement bolt is installed inside the inserted and cast steel pipe. (C) is an enlarged cross-sectional view illustrating a situation in which a steel pipe inserted and cast is pulled out, a solidified material is injected into an excavation hole, and a ground reinforcement bolt is fixedly fixed in the ground. is there.

【図3】鋼管の先端に取り付けた穿孔ビットの構成を説
明する断面図である。
FIG. 3 is a cross-sectional view illustrating a configuration of a drill bit attached to a tip of a steel pipe.

【図4】図3のA−Aに沿った断面図である。FIG. 4 is a sectional view taken along the line AA of FIG. 3;

【図5】穿孔ビットの後部に嵌合される鋼管の先端部の
形状を示す断面図である。
FIG. 5 is a sectional view showing a shape of a distal end portion of a steel pipe fitted to a rear portion of a drill bit.

【図6】地山補強用ボルトとしてのケーブルボルトの構
成を示す断面図である。
FIG. 6 is a cross-sectional view showing a configuration of a cable bolt as a ground reinforcement bolt.

【符号の説明】[Explanation of symbols]

10 地山補強用ボルト 11 トンネル 12 鋼管 13 穿孔ビット 14 注入固化材 15 隙間 16 嵌合凹部16 17 嵌合凸部17 18 ケーブルボルト 19 固定羽 25 掘削孔 DESCRIPTION OF SYMBOLS 10 Ground reinforcement bolt 11 Tunnel 12 Steel pipe 13 Drilling bit 14 Injection solidification material 15 Clearance 16 Fitting concave part 16 17 Fitting convex part 17 18 Cable bolt 19 Fixed wing 25 Excavation hole

フロントページの続き (72)発明者 中原 巌 東京都渋谷区桜丘町15−17 日本基礎技術 株式会社内Continued on the front page (72) Inventor Iwao Nakahara 15-17 Sakuragaokacho, Shibuya-ku, Tokyo Japan Basic Technology Co., Ltd.

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 ケーブルボルトやロックボルト等の地山
補強用ボルトを地中に定着設置するための施工方法であ
って、先端に拡径穿孔ビットを装着した鋼管を、これの
内部に削孔水を注入して掘削土砂をこの注入水とともに
前記鋼管の外側の隙間を通過させることにより排除しつ
つ地山中に削孔打設し、前記鋼管が所定の深度に達した
ら、前記鋼管内に地山補強用ボルトをその先端まで挿入
し、しかる後に、削孔した掘削孔に前記拡径穿孔ビット
を残置するようにして前記鋼管を引き抜くとともに前記
掘削孔に注入固化材を注入することにより、前記地山補
強用ボルトを前記注入固化材を介して地山中に定着固定
することを特徴とする地山補強用ボルトの施工方法。
A method for fixing ground reinforcement bolts such as cable bolts and rock bolts in the ground, wherein a steel pipe having an enlarged diameter drill bit at the tip is drilled inside the steel pipe. Water is injected to excavate excavated earth and sand together with the injected water, thereby removing the excavated soil through the gap outside the steel pipe, and drilling the ground into the ground, and when the steel pipe reaches a predetermined depth, the ground is poured into the steel pipe. By inserting the mountain reinforcement bolt to the tip thereof, and then, by pulling out the steel pipe so as to leave the enlarged diameter drilling bit in the drilled hole and injecting the injected solidified material into the drilling hole, A method for constructing a ground reinforcement bolt, comprising fixing and fixing the ground reinforcement bolt in the ground through the injected solidified material.
【請求項2】 前記ケーブルボルトやロックボルト等の
地山補強用ボルトが内部に中空通路を有し、この中空通
路を介して掘削孔内の空気抜きを行ないながら前記掘削
孔へ注入固化材を注入する作業を行なうことを特徴とす
る請求項1に記載の地山補強用ボルトの施工方法。
2. A ground reinforcing bolt such as the cable bolt or the lock bolt has a hollow passage therein, and the solidified material is injected into the drill hole while bleeding air from the hole through the hollow passage. The method for constructing a ground reinforcement bolt according to claim 1, wherein the work is performed.
JP08351115A 1996-12-27 1996-12-27 Construction method of ground reinforcement bolt Expired - Lifetime JP3100347B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP08351115A JP3100347B2 (en) 1996-12-27 1996-12-27 Construction method of ground reinforcement bolt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP08351115A JP3100347B2 (en) 1996-12-27 1996-12-27 Construction method of ground reinforcement bolt

Publications (2)

Publication Number Publication Date
JPH10184296A true JPH10184296A (en) 1998-07-14
JP3100347B2 JP3100347B2 (en) 2000-10-16

Family

ID=18415156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP08351115A Expired - Lifetime JP3100347B2 (en) 1996-12-27 1996-12-27 Construction method of ground reinforcement bolt

Country Status (1)

Country Link
JP (1) JP3100347B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102031555A (en) * 2010-10-13 2011-04-27 广东省基础工程公司 Construction method for clearing away waste soil nails and anchor rods in soil by utilizing electrolytic corrosion technology
CN103806084A (en) * 2014-01-28 2014-05-21 周锡武 Construction method for eliminating metal objects in soil in fixed area

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102031555A (en) * 2010-10-13 2011-04-27 广东省基础工程公司 Construction method for clearing away waste soil nails and anchor rods in soil by utilizing electrolytic corrosion technology
CN103806084A (en) * 2014-01-28 2014-05-21 周锡武 Construction method for eliminating metal objects in soil in fixed area

Also Published As

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