JP2012077509A - Expansion steel pipe lock bolt, manufacturing method thereof, and natural ground reinforcing method - Google Patents

Expansion steel pipe lock bolt, manufacturing method thereof, and natural ground reinforcing method Download PDF

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JP2012077509A
JP2012077509A JP2010223515A JP2010223515A JP2012077509A JP 2012077509 A JP2012077509 A JP 2012077509A JP 2010223515 A JP2010223515 A JP 2010223515A JP 2010223515 A JP2010223515 A JP 2010223515A JP 2012077509 A JP2012077509 A JP 2012077509A
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steel pipe
lock bolt
expansion
natural ground
hollow steel
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Takuji Yamamoto
拓治 山本
Kensuke Date
健介 伊達
Yasuhiro Yokota
泰宏 横田
Takashi Tsuji
孝志 辻
Tadashi Okabe
正 岡部
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Kajima Corp
KFC Ltd
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Kajima Corp
KFC Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an expansion steel pipe lock bolt, which easily produces a sufficient frictional resistance to reliably reinforce natural ground, even such as soft bedrock, fractured bedrock, unconsolidated natural ground which are difficult to produce sufficient frictional resistance by expansion of a steel pipe.SOLUTION: When pressurized fluid is injected to a hollow steel pipe 2 to be inserted to a bored hole 31, the steel pipe 2 is allowed to expand so that an expansion steel pipe lock bolt 1 is anchored to natural ground 30 by peripheral surface friction with a hole wall 32. The expansion steel pipe lock bolt 1 is provided with the hollow steel pipe 2 of which surface has a plurality of regularly-arranged protrusions 5, preferably made from a steel plate material having a tensile strength of 400 to 510 N/mmand an elongation equal to or greater than 20%, having a striped pattern on the surface.

Description

本発明は、例えばトンネル掘削時に坑内から地山を補強する支保工、先受け工、鏡補強工の地山補強に用いられる膨張型鋼管ロックボルト及びその製造方法、地山補強工法に関する。   The present invention relates to, for example, an expansion type steel pipe lock bolt used for reinforcing a natural ground from a pit during tunnel excavation, a tip receiving work, a mirror reinforcing work, a manufacturing method thereof, and a natural ground reinforcing method.

従来、トンネルを掘削する際に地山を補強して変形や崩壊を抑制するために、地山の支保工部材としてロックボルトを打設する方法がおこなわれてきた。軟岩地山〜亀裂性岩盤等で早期に定着の確保が必要な場合および湧水による定着の確保に影響を受けるなどの場合に、例えば特許文献１、２に記載されている膨張型鋼管ロックボルトが使用されている。   Conventionally, in order to reinforce a natural ground and suppress deformation and collapse when excavating a tunnel, a method of placing a lock bolt as a support member of the natural ground has been performed. For example, Patent Documents 1 and 2 describe the expansion-type steel pipe rock bolts when it is necessary to ensure early fixation in soft rock grounds to cracked rocks or when it is affected by the securing of spring water. Is used.

この膨張型鋼管ロックボルトは、グラウト材なしで、流体を加圧注入し、鋼管の膨張圧で孔壁周面の地山を圧縮するものであり、鋼管表面の摩擦力と地山の応力とを組合わせて補強する。膨張型鋼管ロックボルトでは、その耐荷力が早期に発揮される。   This expansion-type steel pipe lock bolt pressurizes and injects fluid without a grout material, compresses the natural ground on the peripheral surface of the hole wall with the expansion pressure of the steel pipe, and combines the friction force on the surface of the steel pipe and the natural ground stress. Reinforce together. In the expansion type steel pipe lock bolt, the load resistance is demonstrated at an early stage.

また、膨張型鋼管ロックボルトは、亀裂性岩盤等のトンネル掘削時に天端部の剥落を防止するため、孔壁周囲への膨張圧による拘束力の増加と摩擦力により耐荷能力を高めるべく、前方地山を拘束する先受け工、切羽前方の押し出し挙動を抑制する目的で長尺鏡補強工での地山補強にも用いられている。 In addition, in order to prevent the top end from peeling off during tunnel excavation of cracked rock, etc., the expansion-type steel pipe lock bolt is designed to increase the load bearing capacity by increasing the binding force due to the expansion pressure around the hole wall and the frictional force. It is also used for ground support in the long mirror reinforcement work for the purpose of restraining the front receiving work to constrain the natural ground and the pushing behavior in front of the face.

地山に穿孔された孔内へ挿入された膨張型鋼管ロックボルト１００の断面形状は、図８（ａ）に示すように、外周面が平滑な縮径された鋼管で、例えば中央上端から内側に折り曲げられた凹部１０１を有する形状になっている。膨張型鋼管ロックボルト１００を使用する際には、図８（ａ）に示すように、軸方向に沿って折り曲げられた凹部１０１を有する膨張型鋼管ロックボルト１００を、地山２００の削孔された孔２０１内に挿入する。   As shown in FIG. 8 (a), the cross-sectional shape of the expandable steel pipe lock bolt 100 inserted into the hole drilled in the natural ground is a steel pipe with a reduced outer diameter with a smooth outer peripheral surface. It has the shape which has the recessed part 101 bent by. When the expansion type steel pipe lock bolt 100 is used, as shown in FIG. 8A, the expansion type steel pipe lock bolt 100 having the concave portion 101 bent along the axial direction is drilled in the natural ground 200. Into the hole 201.

そして、図８（ｂ）に示すように、膨張型鋼管ロックボルト１００の両端部を閉塞し、且つ、口元側の一端部に設けた注入口より内部に高圧の注入水Ｗを注入して、注入水の圧力で折り曲げられている膨張型鋼管ロックボルト１００を膨張する。この結果、凹部１０１の大きさが小さくなると共に、膨張型鋼管ロックボルト１００の表面は孔壁２０２に密着され、摩擦抵抗で地山２００に定着される。 And as shown in FIG.8 (b), both ends of the expansion type steel pipe lock bolt 100 are closed, and high-pressure injection water W is injected into the inside from an injection port provided at one end of the mouth side, The expansion type steel pipe lock bolt 100 bent by the pressure of the injected water is expanded. As a result, the size of the recess 101 is reduced, and the surface of the expandable steel pipe lock bolt 100 is brought into close contact with the hole wall 202 and fixed to the natural ground 200 by friction resistance.

この地山１００が例えば硬質岩であれば、高圧の注入水Ｗによる膨張圧の除去後に、硬質岩による接触応力ｆが拘束圧として変換されることから、図８（ｃ）に示されるように、大きな摩擦抵抗を確保することができる。 If the natural ground 100 is, for example, hard rock, the contact stress f due to the hard rock is converted as restraint pressure after the expansion pressure is removed by the high-pressure injection water W, and as shown in FIG. Large frictional resistance can be ensured.

特公平２−５２０号公報Japanese Patent Publication No. 2-520 特公平２−５２３８号公報Japanese Patent Publication No.2-5238

ところで、上述の膨張型鋼管ロックボルト１００は、図９に示されるように、表面が平滑な鋼管で造管されているため、地山２００が硬質岩である場合には、膨張圧から接触応力が拘束圧として変換され、定着を充分に確保できる摩擦抵抗を得ることができるが、地山２００が軟質若しくは未固結地山の場合、鋼管の膨張圧によって地山２００に与える圧力が孔壁２０２に均一とならない、若しくは膨張圧により孔壁２０２の地山２００が変形する等、削孔された孔壁２０２の接触応力が拘束圧として変換されず、充分な摩擦抵抗を確保することができない。地山２００の変状から膨張型鋼管ロックボルト１００に軸方向応力が生じる場合には、引抜き耐力の信頼性も損なわれる。   By the way, since the above-mentioned expansion type steel pipe lock bolt 100 is formed with a steel pipe having a smooth surface as shown in FIG. 9, when the natural ground 200 is a hard rock, the contact stress is determined from the expansion pressure. However, when the natural ground 200 is a soft or unconsolidated natural ground, the pressure applied to the natural ground 200 by the expansion pressure of the steel pipe is a hole wall. The contact stress of the drilled hole wall 202 is not converted as a restraint pressure, for example, the ground mountain 200 of the hole wall 202 is deformed by the expansion pressure due to the expansion pressure, and sufficient frictional resistance cannot be ensured. . In the case where axial stress is generated in the expandable steel pipe lock bolt 100 due to the deformation of the natural ground 200, the reliability of the drawing strength is also impaired.

また、亀裂性岩盤および未固結地山におけるトンネル掘削時に、天端部の前方地山を拘束して剥落等を防止する先受け工においても、硬質岩に設置した場合には膨張圧から接触応力が拘束力として発揮され、充分な前方地山の先受け効果を確保できるが、地山２００が軟質若しくは未固結地山の場合、鋼管の膨張圧によって孔壁の地山が変形して均一な接触応力が拘束圧として変換されず、前方地山の充分な拘束力を確保することができずに、天端部の剥落を抑制する効果が損なわれる。同様に、単一の管若しくは複数本の管を接続して長尺鏡補強工への地山補強においても、同様に拘束力を確保することができずに効果が損なわれることとなる。 In addition, when the tunnel is excavated in cracked rock mass and unconsolidated ground, it is also possible to prevent contact from the expansion pressure when it is installed on hard rock. The stress is exerted as a restraining force, and a sufficient receiving effect of the front ground can be secured. However, when the ground 200 is a soft or unconsolidated ground, the ground of the hole wall is deformed by the expansion pressure of the steel pipe. Uniform contact stress is not converted as restraint pressure, and sufficient restraint force of the front ground cannot be secured, and the effect of suppressing peeling of the top end portion is impaired. Similarly, in the case of natural ground reinforcement to a long mirror reinforcing work by connecting a single pipe or a plurality of pipes, similarly, the restraining force cannot be ensured and the effect is impaired.

本発明は上記問題点に鑑みなされたものであって、軟質岩盤、亀裂性岩盤、未固結地山など鋼管の膨張で摩擦抵抗を確保することが難しい地山でも、充分な摩擦抵抗を容易に確保することができ、確実に地山を補強することができる膨張型鋼管ロックボルト及びその製造方法、地山補強工法を提供することを目的とする。 The present invention has been made in view of the above problems, and it is easy to provide sufficient frictional resistance even in a natural ground where it is difficult to ensure a frictional resistance due to the expansion of a steel pipe such as a soft rock, a cracked rock, and an unconsolidated ground. It is an object of the present invention to provide an expansion-type steel pipe lock bolt, a manufacturing method thereof, and a natural ground reinforcement construction method that can secure the natural ground securely.

本発明の膨張型鋼管ロックボルトは、穿孔した孔内に挿入される中空鋼管に流体が加圧注入され、前記中空鋼管を膨張させて孔壁との周面摩擦により、地山に定着される膨張型鋼管ロックボルトにおいて、前記中空鋼管の表面に複数の突起が規則的に設けられていることを特徴とする。
この構成によれば、中空鋼管の表面に規則的に設けられる複数の突起により、軟質岩盤、亀裂性岩盤、未固結地山など鋼管の膨張で摩擦抵抗を確保することが難しい地山でも、充分な摩擦抵抗を容易に確保することができ、確実に地山を補強することができる。 In the expandable steel pipe lock bolt of the present invention, fluid is pressurized and injected into a hollow steel pipe inserted into a drilled hole, and the hollow steel pipe is expanded and fixed to a natural ground by peripheral friction with a hole wall. In the expansion type steel pipe lock bolt, a plurality of protrusions are regularly provided on the surface of the hollow steel pipe.
According to this configuration, by a plurality of protrusions regularly provided on the surface of the hollow steel pipe, even in a natural ground where it is difficult to ensure frictional resistance due to the expansion of the steel pipe such as soft rock, cracked rock, unconsolidated ground, Sufficient frictional resistance can be easily secured, and the natural ground can be reinforced reliably.

本発明の膨張型鋼管ロックボルトは、前記中空鋼管が、板厚２．１〜２．３ｍｍで形成され、引張強さ４００〜５１０Ｎ／ｍｍ２、伸びが２０％以上である鋼板を素材とし、表面に縞目模様が形成されていることを特徴とする。
この構成によれば、中空鋼管の良好な膨張と縞目模様により、一層充分な摩擦抵抗を確保し、地山の補強を強化することができる。 The expansion type steel pipe lock bolt of the present invention is made of a steel plate having a hollow steel pipe formed with a plate thickness of 2.1 to 2.3 mm, a tensile strength of 400 to 510 N / mm 2 and an elongation of 20% or more, A striped pattern is formed on the surface.
According to this structure, the sufficient expansion | swelling of a hollow steel pipe and a striped pattern can ensure more sufficient friction resistance, and can reinforce the reinforcement of a natural ground.

本発明の膨張型鋼管ロックボルトの製造方法は、穿孔した孔内に挿入される中空鋼管に流体が加圧注入され、前記中空鋼管を膨張させて孔壁との周面摩擦により、地山に定着される膨張型鋼管ロックボルトの製造方法において、引張強さ４００〜５１０Ｎ／ｍｍ２、伸びが２０％以上である鋼板を素材とし、圧延によって表面側に複数の突起を規則的に形成する工程と、前記圧延鋼板を曲げて外径寸法５７〜７６．３ｍｍの電縫鋼管を形成する工程と、前記電縫鋼管をロール成形して外形寸法４０〜５５ｍｍに縮径して中空鋼管を形成する工程とを備えることを特徴とする。
この構成によれば、充分な摩擦抵抗を容易に確保することができ、確実に地山を補強することができる膨張型鋼管ロックボルトを容易に且つ正確に製造することができる。 In the method of manufacturing an expandable steel pipe lock bolt of the present invention, a fluid is pressurized and injected into a hollow steel pipe inserted into a drilled hole, and the hollow steel pipe is expanded to produce a natural ground due to peripheral surface friction with the hole wall. In the manufacturing method of the expansion type steel pipe rock bolt to be fixed, a step of regularly forming a plurality of protrusions on the surface side by rolling using a steel plate having a tensile strength of 400 to 510 N / mm 2 and an elongation of 20% or more as a raw material And bending the rolled steel sheet to form an electric resistance steel pipe having an outer diameter of 57 to 76.3 mm, and roll forming the electric resistance steel pipe to reduce the outer diameter to 40 to 55 mm to form a hollow steel pipe. And a process.
According to this configuration, it is possible to easily and accurately manufacture an expandable steel pipe lock bolt that can easily ensure a sufficient frictional resistance and can reliably reinforce the natural ground.

本発明の地山補強工法は、本発明の膨張型鋼管ロックボルトを用いる地山補強工法であって、地山に穿孔した孔内にモルタルを充填すると共に前記規則的な複数の突起を有する中空鋼管を挿入し、該孔内の中空鋼管に流体を加圧注入して膨張させることを特徴とする。
この構成によれば、軟質岩盤、亀裂性岩盤、未固結地山など鋼管の膨張で摩擦抵抗を確保することが難しい地山でも、充分な摩擦抵抗を容易に確保することができ、確実に地山を補強することができると共に、モルタルの併用で地山補強効果を一層高めることができる。 The natural ground reinforcement method of the present invention is a natural ground reinforcement method using the expansion type steel pipe rock bolt of the present invention, in which a mortar is filled in a hole drilled in the natural ground and a hollow having the plurality of regular protrusions. A steel pipe is inserted, and fluid is pressurized and injected into the hollow steel pipe in the hole.
According to this configuration, it is possible to easily ensure sufficient frictional resistance even in rocks where it is difficult to ensure frictional resistance due to the expansion of steel pipes, such as soft rocks, cracking rocks, and unconsolidated grounds. The natural ground can be reinforced, and the combined use of mortar can further enhance the natural ground reinforcing effect.

本発明の地山補強工法は、前記膨張型鋼管ロックボルトの前記中空鋼管の長さを３ｍ〜８ｍとし、前記中空鋼管を接続して長さ６ｍ〜２０ｍの補強管を形成して前記孔内に挿入し、前記補強管に流体を加圧注入して膨張させることを特徴とする。
この構成によれば、複数本の中空鋼管を接続する長尺鏡補強工等の地山補強でも、充分な摩擦抵抗を容易に確保し、確実に地山補強を図ることができる。 In the natural ground reinforcement method of the present invention, the length of the hollow steel pipe of the expansion type steel pipe lock bolt is 3 m to 8 m, and the hollow steel pipe is connected to form a reinforcing pipe having a length of 6 m to 20 m. And the fluid is pressurized and injected into the reinforcing tube to be expanded.
According to this configuration, even with natural ground reinforcement such as a long mirror reinforcement for connecting a plurality of hollow steel pipes, sufficient frictional resistance can be easily ensured, and natural ground reinforcement can be achieved.

本発明によれば、軟質岩盤、亀裂性岩盤、未固結地山など鋼管の膨張で摩擦抵抗を確保することが難しい地山でも、充分な摩擦抵抗を容易に確保することができ、確実に地山を補強することができる。即ち、中空鋼管の表面に突起状の粗面形状を設けることにより、軟質な地山においても粗面形状が孔壁に食込む形態で、孔壁と鋼管表面の摩擦抵抗と密着性が高まり、粗面形状が引抜き耐力として機能する。   According to the present invention, it is possible to easily ensure sufficient frictional resistance even in a natural ground where it is difficult to ensure frictional resistance due to expansion of a steel pipe such as soft rock, cracked rock, unconsolidated ground, etc. A natural mountain can be reinforced. That is, by providing a projection-like rough surface shape on the surface of the hollow steel pipe, even in a soft ground, the rough surface shape bites into the hole wall, increasing the friction resistance and adhesion between the hole wall and the steel pipe surface, The rough surface shape functions as the pulling strength.

そして、軟岩〜未固結地山の軟質な地山状況においても支保工部材として、中空鋼管の表面と膨張圧による孔壁面とに所要の摩擦抵抗を得ることができ、充分な引抜き耐力が確保することができる。また、トンネル掘削時に天端部の前方地山を拘束して、剥落等を防止する先受け工として使用する場合においても、前方地山の拘束に必要な孔壁周面の密着性を充分に確保することができ、好適には接触する粗面状の中空鋼管表面と孔壁の間にモルタル充填を併用して、孔壁との摩擦抵抗と中空鋼管表面との密着性の一層の向上により、切羽前方地山の拘束力を高めることができる。また、複数本の中空鋼管を接続する長尺鏡補強工等の地山補強でも、充分な摩擦抵抗を容易に確保することができる。   And even in soft ground conditions from soft rock to unconsolidated ground, as a support member, the required frictional resistance can be obtained on the surface of the hollow steel pipe and the hole wall surface due to expansion pressure, ensuring sufficient pulling strength can do. In addition, even when used as a receiving work that restrains the front ground at the top of the tunnel during tunnel excavation and prevents peeling, etc., sufficient adhesion of the peripheral surface of the hole wall necessary for restraining the front ground is sufficiently secured. It is preferable to use a mortar filling between the surface of the rough hollow steel pipe surface that comes into contact with the hole wall, and to further improve the friction resistance with the hole wall and the adhesion between the surface of the hollow steel pipe, The restraint force of the front ground can be increased. In addition, sufficient frictional resistance can be easily ensured even by natural ground reinforcement such as a long mirror reinforcement work connecting a plurality of hollow steel pipes.

（ａ）は本発明による実施形態の膨張型鋼管ロックボルトを穿孔した孔内に挿入した状態を示す膨張前の側面図、（ｂ）は孔内に挿入した膨張型鋼管ロックボルトの膨張前の部分拡大図。(A) is the side view before expansion which shows the state inserted in the hole which perforated the expansion type steel pipe lock bolt of embodiment by this invention, (b) is before expansion of the expansion type steel pipe lock bolt inserted in the hole. Partial enlarged view. （ａ）は本発明による実施形態の膨張型鋼管ロックボルトが穿孔した孔内で膨張した状態を示す側面図、（ｂ）はその膨張型鋼管ロックボルトが孔内で膨張した状態を示す部分拡大図。(A) is a side view showing a state in which the expansion type steel pipe lock bolt of the embodiment according to the present invention has expanded in a hole drilled, and (b) is a partially enlarged view showing a state in which the expansion type steel pipe lock bolt has expanded in the hole. Figure. （ａ）は本発明による実施形態の膨張型鋼管ロックボルトに使用する中空鋼管表面の縞目模様を示す拡大図、（ｂ）は膨張型鋼管ロックボルトに使用する中空鋼管表面の縞目模様と縞高を示す説明図。(A) is an enlarged view showing a striped pattern on the surface of a hollow steel pipe used for the expandable steel pipe lock bolt of the embodiment according to the present invention, and (b) is a striped pattern on the surface of the hollow steel pipe used for the expandable steel pipe lock bolt. Explanatory drawing which shows stripe height. 実施形態の膨張型鋼管ロックボルトを支保部材として使用した加圧膨張後の地山の応力状態を示す説明図。Explanatory drawing which shows the stress state of the natural ground after pressure expansion which used the expansion type steel pipe lock bolt of embodiment as a support member. （ａ）は実施形態の膨張型鋼管ロックボルトを地山補強工の支保部材として使用した状態の横断面図、（ｂ）は支保部材として使用した加圧膨張後の地山の応力状態を示す説明図。(A) is a cross-sectional view of a state in which the expansion type steel pipe lock bolt of the embodiment is used as a support member of a natural ground reinforcement work, and (b) shows the stress state of the natural ground after pressure expansion used as a support member. Illustration. （ａ）は実施形態の膨張型鋼管ロックボルトを先受け工として使用した状態を示す横断面図、（ｂ）は先受け工として使用した加圧膨張後の地山の応力状態を示す縦断面図。(A) is a cross-sectional view showing a state in which the expansion-type steel pipe lock bolt of the embodiment is used as a pre-receiving work, and (b) is a vertical cross-section showing a stress state of a natural mountain after pressure expansion used as a pre-receiving work. Figure. （ａ）は実施形態の膨張型鋼管ロックボルトを鏡補強工として使用した状態を示す横断面図、（ｂ）は鏡補強工として使用した加圧膨張後の地山の応力状態を示す縦断面図。(A) is a cross-sectional view showing a state in which the expansion-type steel pipe lock bolt of the embodiment is used as a mirror reinforcement, and (b) is a longitudinal cross-section showing a stress state of a natural mountain after pressure expansion used as a mirror reinforcement. Figure. （ａ）は従来の膨張型鋼管ロックボルトを穿孔した孔内に挿入した状態を示す膨張前の断面図、（ｂ）は従来の膨張型鋼管ロックボルトが孔内で膨張した状態を示す断面図、（ｃ）は従来の膨張型鋼管ロックボルトが孔内で膨張した後の接触応力を受けた状態を示す断面図。(A) is sectional drawing before the expansion which shows the state inserted in the hole which perforated the conventional expansion type steel pipe lock bolt, (b) is sectional drawing which shows the state which the conventional expansion type steel pipe lock bolt expanded in the hole (C) is sectional drawing which shows the state which received the contact stress after the conventional expansion type steel pipe lock bolt expanded in the hole. （ａ）は従来の支保部材として使用した加圧膨張後の地山の応力状態を示す説明図。(A) is explanatory drawing which shows the stress state of the natural ground after the pressure expansion used as a conventional supporting member.

以下に、本発明の実施形態について図１〜図７に従って説明する。   Hereinafter, embodiments of the present invention will be described with reference to FIGS.

本実施形態の膨張型鋼管ロックボルト１は、図１〜図４に示すように、地山３０に穿孔した孔３１内に挿入される中空鋼管２に流体が加圧注入され、中空鋼管２を膨張させて孔壁３２との周面摩擦により、地山３０に定着されるものであり、中空鋼管２は図示例の中央上端など周方向の一箇所から内側に折り曲げられた凹部２１を有する形状になっている。中空鋼管２の先端部には封止側スリーブ３、中空鋼管３の口元端部には注水側スリーブ４が設けられて、その両端部が閉塞されており、その表面には複数の突起５が規則的に設けられている。   As shown in FIGS. 1 to 4, the expandable steel pipe lock bolt 1 of the present embodiment is configured such that a fluid is pressurized and injected into a hollow steel pipe 2 inserted into a hole 31 drilled in a natural ground 30. The hollow steel pipe 2 is inflated and fixed to the natural ground 30 by the peripheral surface friction with the hole wall 32, and the hollow steel pipe 2 has a concave portion 21 bent inward from one place in the circumferential direction, such as the center upper end of the illustrated example. It has become. A sealing sleeve 3 is provided at the tip of the hollow steel tube 2, and a water injection sleeve 4 is provided at the mouth end of the hollow steel tube 3, both ends thereof are closed, and a plurality of protrusions 5 are formed on the surface thereof. It is provided regularly.

中空鋼管２は、引張強さ４００〜５１０Ｎ／ｍｍ２、伸びが２０％以上である鋼板を素材とし、板厚２．１〜２．３ｍｍで形成されている。表面の突起５は、前記鋼板の素材に圧延加工を施す際に、同時に形成すると好適である。 The hollow steel pipe 2 is made of a steel plate having a tensile strength of 400 to 510 N / mm 2 and an elongation of 20% or more, and is formed with a plate thickness of 2.1 to 2.3 mm. The protrusions 5 on the surface are preferably formed at the same time when the steel plate material is rolled.

突起５の配置形状は、図３に示すように、平面視略楕円形の突起５を長径方向が交互になるような配置で縞目模様に形成すると好適である。図３（ｂ）の例では、突起５の高さ（縞高）１．０〜２．０ｍｍ、突起５・５間のピッチ（縞ピッチ）２０ｍｍ、突起５の部分以外の板厚（地厚）２．１〜２．３ｍｍで形成されている。突起５の縞高は、縞高が高いと大きな摩擦抵抗が確保されるが、縮径における加工を考慮して１〜２ｍｍが好ましい。また、中空鋼管２は、圧延鋼板を曲げて外径寸法５７〜７６．３ｍｍの電縫鋼管を形成し、電縫鋼管をロール成形して外形寸法４０〜５５ｍｍに縮径して中空鋼管を形成すると好適である。 As shown in FIG. 3, it is preferable to form the protrusions 5 having a substantially elliptical shape in plan view in a striped pattern so that the major axis directions are alternated. In the example of FIG. 3B, the height (stripe height) of the protrusion 5 is 1.0 to 2.0 mm, the pitch between the protrusions 5 and 5 (stripe pitch) is 20 mm, and the plate thickness (ground thickness) other than the protrusion 5 portion. ) It is formed with 2.1 to 2.3 mm. When the fringe height is high, a large frictional resistance is ensured, but the fringe height of the protrusion 5 is preferably 1 to 2 mm in consideration of processing in a reduced diameter. The hollow steel pipe 2 is formed by bending a rolled steel plate to form an ERW steel pipe having an outer diameter of 57 to 76.3 mm, and roll forming the ERW steel pipe to reduce the outer diameter to 40 to 55 mm to form a hollow steel pipe. It is preferable.

膨張型鋼管ロックボルト１は、図１（ａ）に示すように、地山３０に穿孔された孔３１内に挿入されている。膨張型鋼管ロックボルト１は、図１（ｂ）に示すように、縮径されて外周は円形に形成され、且つ中央上端から内側に管の内径に沿うように折り曲げられ、凹部２１が深く内側に突出する断面形状で形成されている。孔３１は、例えば孔壁３２の外径が５５ｍｍで穿孔長４ｍとされ、膨張型鋼管ロックボルト１は、例えば外径寸法４５ｍｍ、長さ４ｍとされる。   The expansion type steel pipe lock bolt 1 is inserted into a hole 31 drilled in a natural ground 30 as shown in FIG. As shown in FIG. 1 (b), the expansion type steel pipe lock bolt 1 is reduced in diameter and formed in a circular outer periphery, and is bent from the upper end of the center inward along the inner diameter of the pipe, so that the recess 21 is deeply inside. It is formed in the cross-sectional shape which protrudes. The hole 31 has, for example, an outer diameter of the hole wall 32 of 55 mm and a perforation length of 4 m, and the expandable steel pipe lock bolt 1 has an outer diameter of 45 mm and a length of 4 m, for example.

口元端部の注水側スリーブ４には、高圧の注入水Ｗの注入口が形成されており、この注入口から注入水Ｗを注入して膨張型鋼管ロックボルト１を加圧膨張させ、凹部２１の大きさが縮小するように膨張型鋼管ロックボルト１が拡大し、図２に示すように、地山３０の岩盤の孔壁３２に定着させる。図２（ａ）及び（ｂ）は、膨張型鋼管ロックボルト１が加圧膨張後の孔壁３２に定着した状態で、中空鋼管２の断面形状が拡大し、膨張して接触する孔壁３２に突起５の形状が食い込んで密着した状態を示しており、軟質な地山においても中空鋼管２表面の突起５の孔壁面への食い込み力は大きく確保される。   The water injection side sleeve 4 at the end of the mouth is formed with an injection port for high-pressure injection water W. The injection water W is injected from this injection port to pressurize and expand the expandable steel pipe lock bolt 1, thereby forming the recess 21. The expansion type steel pipe lock bolt 1 is enlarged so that the size of the steel pipe is reduced, and is fixed to the hole wall 32 of the rock mass of the natural ground 30 as shown in FIG. 2 (a) and 2 (b) show a state in which the hollow steel pipe 2 is expanded and brought into contact with the hole wall 32 in a state where the expandable steel pipe lock bolt 1 is fixed to the hole wall 32 after the pressure expansion. The shape of the protrusion 5 bites into and closely adheres, and even in a soft ground, the biting force of the protrusion 5 on the surface of the hollow steel pipe 2 into the hole wall surface is largely secured.

ここで、膨張型鋼管ロックボルト１を砂質土地山を想定した引き抜き試験の結果を表１に示す。従来の表面が平滑な膨張型鋼管ロックボルト１００と本実施形態の表面が縞模様形状の膨張型鋼管ロックボルト１に対する、砂質土を想定した地山状況による引き抜き試験は、未固結な砂質土地山の孔壁に膨張型鋼管ロックボルト１、１００が密着した状態を再現するために、注入材による付着力の影響を最小限とした水ガラス系溶液タイプの浸透によるサンドゲルの状態によって行った。   Here, Table 1 shows the results of a pull-out test assuming that the expandable steel pipe lock bolt 1 is sandy land. A conventional pull-out test based on a ground condition assuming a sandy soil for the expansion steel pipe lock bolt 100 having a smooth surface and the expansion steel pipe lock bolt 1 having a striped pattern on the surface according to the present embodiment is an unconsolidated sand. In order to reproduce the state where the expansion type steel pipe rock bolts 1 and 100 are in close contact with the hole wall of the pebble land, it is performed by the state of the sand gel by the penetration of the water glass solution type that minimizes the influence of the adhesive force by the injection material It was.

結果は表１の数値に示されるように、膨張型鋼管ロックボルト１では、従来の膨張型鋼管ロックボルト１００の約５倍の付着力が示されている。引き抜き試験の結果においては、従来の表面が平滑な膨張型鋼管ロックボルト１００が７２ｋＮ（１８×４ｍ）で、所要の引抜き耐力（１９０ｋＮ）に不足する状態であるが、本実施形態の膨張型鋼管ボルト１では所要の１９０ｋＮ以上（９７．８×4ｍ）を充分に確保できる結果が得られている。   As shown in the numerical values of Table 1, the expansion type steel pipe lock bolt 1 shows about five times the adhesion force of the conventional expansion type steel pipe lock bolt 100. As a result of the pull-out test, the conventional expansion-type steel pipe lock bolt 100 with a smooth surface is 72 kN (18 × 4 m), and the required pull-out strength (190 kN) is insufficient. In the case of the bolt 1, the result that the required 190 kN or more (97.8 × 4 m) can be sufficiently secured is obtained.

Figure 2012077509
Figure 2012077509

次に、膨張型鋼管ロックボルト１を支保部材として用いる場合について説明する。図4には、トンネル掘削後のトンネル空間Ｔに吹付けコンクリート６、鋼製支保工７が設置され、パターンボルトとして膨張型鋼管ロックボルト１を設置後の地山３０の応力状態が示されている。地山３０が軟質な地山の場合には、通常のロックボルトでは早期の引抜き耐力を確保することができないことから、トンネル掘削時の支保部材として膨張型鋼管ロックボルト１が設置されている。膨張型鋼管ロックボルト１には、注水側スリーブ4の注入口より高圧の注入水Ｗが封入され、膨張型鋼管ロックボルト１を加圧膨張した孔壁３２に定着した状態とし、中空鋼管２の断面形状が拡大して接触する膨張時の孔壁３２に縞模様形状の突起５が食い込み密着している。   Next, the case where the expansion type steel pipe lock bolt 1 is used as a support member will be described. FIG. 4 shows the stress state of the natural ground 30 after the shot concrete 6 and the steel support 7 are installed in the tunnel space T after tunnel excavation, and the expandable steel pipe lock bolt 1 is installed as a pattern bolt. Yes. In the case where the natural ground 30 is a soft natural ground, it is impossible to secure an early pulling strength with a normal rock bolt. Therefore, the expandable steel pipe lock bolt 1 is installed as a support member during tunnel excavation. The expansion type steel pipe lock bolt 1 is filled with high-pressure injection water W from the injection port of the water injection side sleeve 4, and the expansion type steel pipe lock bolt 1 is fixed to the pressurized and expanded hole wall 32. The protrusion 5 having a striped pattern bites into and comes into close contact with the hole wall 32 at the time of expansion in which the cross-sectional shape expands and comes into contact.

軟質な地山状況においては、軟質な地山状況においては、膨張圧ｃから接触応力ｆが拘束圧として変換されにくく、所要の引抜き耐力としての摩擦抵抗ｇが得られないため、中空鋼管２の断面形状を拡大して接触する膨張時の孔壁３２に縞模様形状の突起５を食い込み密着させて、膨張型鋼管ロックボルト１による大きな摩擦抵抗ｇが得られ、早期の引抜き耐力が確保される。図中のｋは地山の応力である。   In the soft ground condition, in the soft ground condition, the contact stress f is not easily converted from the expansion pressure c as a restraint pressure, and the frictional resistance g as the required pulling strength cannot be obtained. By expanding the cross-sectional shape into the hole wall 32 at the time of expansion, the strip-shaped protrusion 5 is bitten and brought into close contact, thereby obtaining a large frictional resistance g by the expandable steel pipe lock bolt 1 and ensuring an early pulling strength. . K in the figure is the stress of the natural ground.

図５（ａ）に実施形態の膨張型鋼管ロックボルト１を地山補強工の支保部材（パターンボルト）として使用した状態の横断面図、図５（ｂ）に膨張型鋼管ロックボルト１を天端部の支保部材として使用した加圧膨張後の地山の応力状態を示す。トンネル掘削に伴うゆるみ領域８の影響から地山の応力ｋはトンネル内空側に働くが、膨張型鋼管ロックボルト１の大きな摩擦抵抗ｇによりロックボルトの補強効果が発揮される。 FIG. 5 (a) is a cross-sectional view of the state in which the expansion-type steel pipe lock bolt 1 of the embodiment is used as a support member (pattern bolt) for natural ground reinforcement, and FIG. The stress state of the natural ground after pressurization expansion used as a support member of an end is shown. Due to the influence of the loosened region 8 associated with tunnel excavation, the stress k of the natural ground acts on the inner space side of the tunnel, but the reinforcing effect of the lock bolt is exerted by the large frictional resistance g of the expandable steel pipe lock bolt 1.

次に、亀裂性岩盤及び未固結地山において、トンネル掘削時に天端部の前方地山を拘束して剥落等を防止する先受け工９として、従来の表面が平滑な膨張型鋼管ロックボルト１００と本実施形態による表面が縞模様形状の膨張型鋼管ロックボルト１とを用いる場合について説明する。本例では、密着性を高めるためのモルタル充填を併用しており、先受け工９を設置後の掘削サイクルは早期となり、弱令時におけるモルタルの付着耐力が影響することとなる。   Next, in the cracked rock mass and unconsolidated ground, the conventional steel expansion rock bolt with a smooth surface is used as a receiving work 9 for restraining the front ground at the top of the tunnel to prevent peeling. The case where the expansion type steel pipe lock bolt 1 whose surface by 100 and the surface by this embodiment are striped pattern shape is used is demonstrated. In this example, mortar filling for improving adhesion is used in combination, and the excavation cycle after installing the first receiving work 9 becomes early, and the adhesion strength of the mortar at the time of weak age is affected.

その試験結果について表２に示す。モルタルの硬化状況は１２ｈ後の材令とし、その際の付着力を試験結果としている。表２に示されるように、弱令時の引抜き試験結果において従来の表面が平滑な膨張型鋼管ボルト１００では、０．１９Ｎ／ｍｍ２の付着力であり、膨張型鋼管ロックボルト１では、０．５０Ｎ／ｍｍ２と２倍以上の付着力が確保でき、充分な付着力向上の効果が得られている。 The test results are shown in Table 2. The mortar is cured after 12 hours, and the adhesive strength at that time is the test result. As shown in Table 2, the conventional steel pipe bolt 100 having a smooth surface in the pull-out test result at the time of weak age has an adhesion of 0.19 N / mm 2 , and the expansion steel pipe lock bolt 1 has 0 .. Adhesive strength of 50 N / mm 2 or more can be secured, and a sufficient effect of improving adhesive strength is obtained.

Figure 2012077509
Figure 2012077509

図６（ａ）はトンネル空間Ｔにおける先受け工９の横断面図で、天端部の１２０°範囲に６０cm間隔で、長さ３ｍの膨張型鋼管ロックボルト１で先受け工９として設置されている。図中、６は吹付けコンクリート、７は鋼製支保工、８はゆるみ領域である。図６（ｂ）の縦断図は先受け工９のトンネル掘削時における地山３０の応力状態を示し、膨張型鋼管ロックボルト１には曲げ応力と軸方向応力が作用しているため、軟質地山においては拘束力としての付着耐力が劣り、先受け工部材と孔壁周面との摩擦抵抗ｇと付着耐力を確保する必要性がある。従って、好ましくは、膨張型鋼管ロックボルト１の打設に先立ち予め孔３１内にモルタルを充填しておく等の手段により、接触する粗面状の中空鋼管２の表面と孔壁３２との間にモルタル充填を併用して、膨張型鋼管ロックボルト１の摩擦抵抗ｇと密着性の向上により切羽前方地山の拘束力を高める。 FIG. 6 (a) is a cross-sectional view of the front receiving work 9 in the tunnel space T, which is installed as a front receiving work 9 with an expansion-type steel pipe lock bolt 1 having a length of 3 m at a distance of 60 cm in a 120 ° range of the top end. ing. In the figure, 6 is shotcrete, 7 is a steel support, and 8 is a loosened region. 6B shows the stress state of the natural ground 30 at the time of tunnel excavation of the receiving work 9, and since the bending stress and the axial stress are acting on the expandable steel pipe lock bolt 1, the soft ground In the mountains, the adhesion strength as a binding force is inferior, and it is necessary to secure the frictional resistance g and adhesion strength between the front receiving member and the peripheral surface of the hole wall. Therefore, it is preferable that the surface of the rough hollow steel pipe 2 to be in contact with the hole wall 32 by a means such as filling mortar in the hole 31 in advance before the expansion type steel pipe lock bolt 1 is placed. In addition, mortar filling is used in combination with the frictional resistance g and adhesion of the expandable steel pipe lock bolt 1 to increase the restraint force of the ground in front of the face.

また、本実施形態の膨張型鋼製ロックボルト１は、例えば図７に示すように、鏡補強工１０の補強管として用いても従来の周面が平滑な鋼管による周面付着力の不足を補うことができ、縞模様形状の突起５を孔壁３２に食い込み密着させ、膨張型鋼管ロックボルト１による大きな摩擦抵抗ｇを得ることができ、早期の引抜き耐力が確保される。図７（ａ）の鏡補強工１０の横断面図において、吹付けコンクリート６を施した鏡部には、範囲に１．５ｍ間隔で、長さ６ｍの膨張型鋼管ロックボルト１が設置されている。図７（ｂ）の縦断図は、鏡補強工１０のトンネル掘削時における切羽鏡部１１の地山の応力状態を示しており、膨張型鋼管ロックボルト１には卓越した軸方向応力が作用している。軟質地山のゆるみ領域8においては拘束力としての付着耐力が劣るため、鏡補強部材と孔壁周面との摩擦抵抗ｇを確保する必要性があり、膨張型鋼管ロックボルト１の摩擦抵抗ｇの向上により切羽前方地山の拘束力を高めることができる。 Further, as shown in FIG. 7, for example, as shown in FIG. 7, the expansion type steel rock bolt 1 of the present embodiment has insufficient peripheral surface adhesion due to a steel tube having a smooth peripheral surface even when used as a reinforcing tube of a mirror reinforcement work 10. It is possible to compensate, and the striped projection 5 is bitten into the hole wall 32 so as to be brought into close contact therewith, thereby obtaining a large frictional resistance g by the expandable steel pipe lock bolt 1 and securing an early pulling strength. In the cross-sectional view of the mirror reinforcement work 10 in FIG. 7 (a), an expansion type steel pipe lock bolt 1 having a length of 6m is installed in the range at 1.5m intervals in the mirror part to which the shotcrete 6 is applied. Yes. The vertical cross-sectional view of FIG. 7B shows the stress state of the natural ground of the face mirror part 11 during the tunnel excavation of the mirror reinforcement work 10, and an excellent axial stress acts on the expandable steel pipe lock bolt 1. ing. In the loose region 8 of the soft ground, the adhesion strength as a restraining force is inferior, so it is necessary to secure the frictional resistance g between the mirror reinforcing member and the peripheral surface of the hole wall, and the frictional resistance g of the expandable steel pipe lock bolt 1 is improved. Thus, the binding force of the ground in front of the face can be increased.

尚、鏡補強工１０の補強管等として膨張型鋼製ロックボルト１を接続する場合には、例えば膨張型鋼管ロックボルト１の中空鋼管２の長さを３ｍ〜８ｍとし、中空鋼管２を接続管を介して接続して長さ６ｍ〜２０ｍの補強管を形成して孔３１内に挿入し、その補強管に流体を加圧注入して膨張させる構成等とすると良好である。   When the expansion steel lock bolt 1 is connected as a reinforcement pipe or the like of the mirror reinforcement work 10, for example, the length of the hollow steel pipe 2 of the expansion steel pipe lock bolt 1 is set to 3 m to 8 m, and the hollow steel pipe 2 is connected. It is preferable to form a reinforcing pipe having a length of 6 m to 20 m by connecting through a pipe, inserting the reinforcing pipe into the hole 31, and injecting a fluid into the reinforcing pipe for expansion.

〔実施形態の変形例等〕
本明細書開示の発明には、各発明や実施形態等の構成の他に、これらの部分的な構成を本明細書開示の他の構成に変更して特定したもの、或いはこれらの構成に本明細書開示の他の構成を付加して特定したもの、或いはこれらの部分的な構成を部分的な作用効果が得られる限度で削除して特定した上位概念化したものも含まれ、例えば下記変形例も包含する。 [Modifications of Embodiment, etc.]
In addition to the configurations of the inventions and embodiments, the invention disclosed in the present specification includes those specified by changing these partial configurations to other configurations disclosed in the present specification, or these configurations. Also included are those specified by adding other configurations disclosed in the specification, or those obtained by deleting these partial configurations to the extent that partial effects can be obtained and specifying them as higher-level concepts. Is also included.

例えば上記実施形態における突起５の形状は平面視略楕円形としたが、これに限定されず、例えば平面視略多角形、平面視略円形等とすることが可能である。また、突起５の配列も縞目模様に限定されず、規則的な配列であれば適宜である。   For example, the shape of the protrusion 5 in the above embodiment is a substantially elliptical shape in plan view, but is not limited thereto, and may be a substantially polygonal shape in plan view, a substantially circular shape in plan view, or the like. Further, the arrangement of the protrusions 5 is not limited to the striped pattern, and is appropriate as long as it is a regular arrangement.

１、１００…膨張型鋼管ロックボルト
２…中空鋼管 ２１、１０１…凹部
３…封止側スリーブ
４…注水側スリーブ
５…突起
６…吹付けコンクリート
７…鋼製支保工
８…ゆるみ領域
９…先受け工
１０…鏡補強工
１１…切羽鏡部
３０、２００…地山
３１、２０１…孔 ３２、２０２…孔壁
ｃ…膨張圧
ｆ…接触応力
ｇ…摩擦抵抗
ｋ…地山応力
Ｗ…注入水
Ｔ…トンネル空間 DESCRIPTION OF SYMBOLS 1,100 ... Expansion type steel pipe lock bolt 2 ... Hollow steel pipe 21, 101 ... Recess 3 ... Sealing side sleeve
4 ... Water injection side sleeve 5 ... Protrusion 6 ... Spring concrete 7 ... Steel support 8 ... Loose area 9 ... Picking work 10 ... Mirror reinforcement work 11 ... Face mirror part 30, 200 ... Mt. 31, 31 ... 201 Hole 32 202 ... hole wall c ... expansion pressure f ... contact stress g ... friction resistance k ... mountain stress W ... injected water T ... tunnel space

Claims (5)

穿孔した孔内に挿入される中空鋼管に流体が加圧注入され、前記中空鋼管を膨張させて孔壁との周面摩擦により、地山に定着される膨張型鋼管ロックボルトにおいて、
前記中空鋼管の表面に複数の突起が規則的に設けられていることを特徴とする膨張型鋼管ロックボルト。 In an expandable steel pipe lock bolt in which fluid is pressurized and injected into a hollow steel pipe inserted into a drilled hole, and the hollow steel pipe is expanded and the peripheral surface friction with the hole wall is fixed to a natural ground.
An expansion type steel pipe lock bolt, wherein a plurality of protrusions are regularly provided on the surface of the hollow steel pipe. 前記中空鋼管が、板厚２．１〜２．３ｍｍで形成され、
引張強さ４００〜５１０Ｎ／ｍｍ２、伸びが２０％以上である鋼板を素材とし、表面に縞目模様が形成されていることを特徴とする請求項１記載の膨張型鋼管ロックボルト。 The hollow steel pipe is formed with a plate thickness of 2.1 to 2.3 mm,
The expansion type steel pipe rock bolt according to claim 1, wherein a steel plate having a tensile strength of 400 to 510 N / mm 2 and an elongation of 20% or more is used as a raw material, and a striped pattern is formed on the surface. 穿孔した孔内に挿入される中空鋼管に流体が加圧注入され、前記中空鋼管を膨張させて孔壁との周面摩擦により、地山に定着される膨張型鋼管ロックボルトの製造方法において、
引張強さ４００〜５１０Ｎ／ｍｍ２、伸びが２０％以上である鋼板を素材とし、圧延によって表面側に複数の突起を規則的に形成する工程と、
前記圧延鋼板を曲げて外径寸法５７〜７６．３ｍｍの電縫鋼管を形成する工程と、
前記電縫鋼管をロール成形して外形寸法４０〜５５ｍｍに縮径して中空鋼管を形成する工程と、
を備えることを特徴とする膨張型鋼管ロックボルトの製造方法。 In a method for producing an expandable steel pipe lock bolt in which a fluid is pressurized and injected into a hollow steel pipe inserted into a drilled hole, and the hollow steel pipe is expanded and the peripheral surface friction with a hole wall is fixed to a natural ground.
A step of forming a plurality of protrusions regularly on the surface side by rolling, using a steel sheet having a tensile strength of 400 to 510 N / mm 2 and an elongation of 20% or more,
Bending the rolled steel sheet to form an ERW steel pipe having an outer diameter of 57 to 76.3 mm;
Forming the hollow steel pipe by roll forming the electric resistance steel pipe and reducing the outer diameter to 40 to 55 mm;
A method for producing an expandable steel pipe lock bolt, comprising: 請求項１又は２記載の膨張型鋼管ロックボルトを用いる地山補強工法であって、
地山に穿孔した孔内にモルタルを充填すると共に前記規則的な複数の突起を有する中空鋼管を挿入し、該孔内の中空鋼管に流体を加圧注入して膨張させることを特徴とする地山補強工法。 A natural ground reinforcement method using the expansion type steel pipe lock bolt according to claim 1,
A ground made by filling a mortar into a hole drilled in a natural ground and inserting a hollow steel pipe having the plurality of regular protrusions, and injecting a fluid into the hollow steel pipe in the hole for expansion. Mountain reinforcement method. 前記膨張型鋼管ロックボルトの前記中空鋼管の長さを３ｍ〜８ｍとし、
前記中空鋼管を接続して長さ６ｍ〜２０ｍの補強管を形成して前記孔内に挿入し、
前記補強管に流体を加圧注入して膨張させることを特徴とする請求項４記載の地山補強工法。 The length of the hollow steel pipe of the expandable steel pipe lock bolt is 3 m to 8 m,
The hollow steel pipe is connected to form a reinforcing pipe having a length of 6m to 20m and inserted into the hole,
The ground reinforcement method according to claim 4, wherein a fluid is pressurized and injected into the reinforcement pipe.
JP2010223515A 2010-10-01 2010-10-01 Expansion steel pipe lock bolt, manufacturing method thereof, and natural ground reinforcing method Pending JP2012077509A (en)

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JP2012255318A (en) * 2011-06-10 2012-12-27 Kajima Corp Expansion-type lock bolt having protrusion
CN104805838A (en) * 2014-01-24 2015-07-29 河南理工大学 Closed tube seam anchor rod body
US9175561B2 (en) 2011-06-14 2015-11-03 Shane Brown Resin injection apparatus for drilling apparatus for installing a ground anchor
KR101690271B1 (en) * 2015-06-30 2016-12-28 광성지엠(주) Packer for square type reinforcement pipe of grout injection apparatus
JP2017150264A (en) * 2016-02-26 2017-08-31 公益財団法人鉄道総合技術研究所 Hollow self-drilling lock bolt reinforcement method using steel expansion-type packer
JP2017150263A (en) * 2016-02-26 2017-08-31 公益財団法人鉄道総合技術研究所 Natural ground improvement-type lock bolt reinforcement method
JP2018123471A (en) * 2017-01-30 2018-08-09 株式会社安藤・間 Method of measuring displacement in front direction of tunnel excavation working face
JP2020023818A (en) * 2018-08-07 2020-02-13 鹿島建設株式会社 Rectangular pit and its construction method

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JP2004019359A (en) * 2002-06-19 2004-01-22 Taisei Corp Natural ground reinforcing method
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JP2005200893A (en) * 2004-01-14 2005-07-28 Nisshin Steel Co Ltd Steel pipe expansion type rock bolt with high bearing capacity and its manufacturing method

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012255318A (en) * 2011-06-10 2012-12-27 Kajima Corp Expansion-type lock bolt having protrusion
US9175561B2 (en) 2011-06-14 2015-11-03 Shane Brown Resin injection apparatus for drilling apparatus for installing a ground anchor
CN104805838A (en) * 2014-01-24 2015-07-29 河南理工大学 Closed tube seam anchor rod body
KR101690271B1 (en) * 2015-06-30 2016-12-28 광성지엠(주) Packer for square type reinforcement pipe of grout injection apparatus
JP2017150264A (en) * 2016-02-26 2017-08-31 公益財団法人鉄道総合技術研究所 Hollow self-drilling lock bolt reinforcement method using steel expansion-type packer
JP2017150263A (en) * 2016-02-26 2017-08-31 公益財団法人鉄道総合技術研究所 Natural ground improvement-type lock bolt reinforcement method
JP2018123471A (en) * 2017-01-30 2018-08-09 株式会社安藤・間 Method of measuring displacement in front direction of tunnel excavation working face
JP2020023818A (en) * 2018-08-07 2020-02-13 鹿島建設株式会社 Rectangular pit and its construction method

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