JP4769961B2 - Mirror bolt and tunnel excavation method - Google Patents

Mirror bolt and tunnel excavation method Download PDF

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JP4769961B2
JP4769961B2 JP2007228225A JP2007228225A JP4769961B2 JP 4769961 B2 JP4769961 B2 JP 4769961B2 JP 2007228225 A JP2007228225 A JP 2007228225A JP 2007228225 A JP2007228225 A JP 2007228225A JP 4769961 B2 JP4769961 B2 JP 4769961B2
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bolt
face
mirror
retaining member
tunnel
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JP2009057802A (en
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英樹 中村
豊明 橘高
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Okumura Corp
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Description

本発明は、砂土や砂質土等の未固結層や崩落性の高い軟岩等から成る軟弱な地山でのトンネルの掘削に好適な鏡止めボルト及びこの鏡止めボルトを用いたトンネル掘削方法に関する。   The present invention relates to a mirror fixing bolt suitable for excavation of a tunnel in a soft ground composed of an unconsolidated layer such as sand or sandy soil or soft rock with high collapsibility, and tunnel excavation using this mirror fixing bolt. Regarding the method.

軟弱な地山でのトンネルの掘削に際しては、トンネルの切羽に地山状況に応じた所定ピッチで複数の鏡止めボルトを打ち込み、掘削中に切羽が崩れないようにしている。そして、従来、切断が比較的容易なグラスファイバー製の鏡止めボルトを用い、この鏡止めボルトを打ち込んだ切羽を鏡止めボルトごと掘削する工程と、鏡止めボルトが残っている状態で切羽に新たな鏡止めボルトを打ち込む工程とを繰り返して掘削を進めていくトンネル掘削方法が知られている。   When excavating a tunnel in a soft ground, a plurality of mirror retaining bolts are driven into the face of the tunnel at a predetermined pitch according to the ground condition so that the face does not collapse during excavation. Conventionally, using a glass fiber mirror locking bolt that is relatively easy to cut, a process of excavating the face with this mirror locking bolt and the mirror locking bolt is excavated, and a new one is added to the face with the mirror locking bolt remaining. A tunnel excavation method is known in which excavation is repeated by repeating the process of driving a simple mirror set bolt.

然し、この掘削方法では、高価なグラスファイバー製ボルトが消耗品として扱われるため、コスト的に不利である。そこで、従来、鏡止めボルトとして鋼製のものを用い、トンネルの切羽に複数の鏡止めボルトを打ち込んだ後、鏡止めボルトの後部が露出するように鏡止めボルトを避けて切羽を掘削する工程と、鏡止めボルトを掘削後の切羽に押し込む工程とを繰り返すようにしたトンネル掘削方法も知られている（例えば、特許文献１参照）。   However, this excavation method is disadvantageous in terms of cost because expensive glass fiber bolts are handled as consumables. Therefore, conventionally, a steel bolt is used as the mirror stop bolt, and after a plurality of mirror stop bolts are driven into the face of the tunnel, the face is excavated by avoiding the mirror stop bolt so that the rear part of the mirror stop bolt is exposed. There is also known a tunnel excavation method in which a mirror locking bolt is pushed into a face after excavation (for example, see Patent Document 1).

この掘削方法によれば、同一の鏡止めボルトを用いて掘削を進めることができるため、工費が安くなる利点がある。然し、鏡止めボルトを避けて切羽を掘削する関係で、掘削作業が面倒になって時間がかかり、工期が長引く不具合がある。   According to this excavation method, since the excavation can be performed using the same mirror retaining bolt, there is an advantage that the construction cost is reduced. However, since the face is excavated while avoiding the mirror fixing bolt, the excavation work becomes troublesome and takes time, and the construction period is prolonged.

また、前後方向に長手のボルト本体の後端に、ボルト本体の径方向外方に突出する板状の土留め部材を着脱自在に取付けて成る鏡止めボルトを用いてトンネルを掘削する方法も知られている（例えば、特許文献２参照）。このものでは、切羽に打ち込んだ複数の鏡止めボルトのうちの一部の鏡止めボルトの土留め部材を取外して、この鏡止めボルトの後部が露出するように鏡止めボルトを避けて切羽を掘削した後、この鏡止めボルトを掘削後の切羽に押し込んでその後端に土留め部材を取付けることを順に全ての鏡止めボルトに対して行う。   Also known is a method of excavating a tunnel using a mirror retaining bolt in which a plate-like earth retaining member projecting radially outward of the bolt body is detachably attached to the rear end of the bolt body elongated in the front-rear direction. (For example, refer to Patent Document 2). In this case, remove the earth retaining member of some of the plurality of mirror fixing bolts driven into the face, and excavate the face avoiding the mirror fixing bolt so that the rear part of this mirror fixing bolt is exposed. After that, the mirror retaining bolt is pushed into the face after excavation, and the earth retaining member is attached to the rear end in order for all the mirror retaining bolts.

これによれば、周辺を掘削中の鏡止めボルト以外の鏡止めボルトの後端の土留め部材により切羽面が押えられるため、切羽の崩れがより確実に防止される。然し、このものでは、上記従来例と同様に鏡止めボルトを避けて切羽を掘削する必要があると共に、掘削の度に土留め部材を着脱することが必要になり、工期の短縮化を図ることはできない。
特開平７−１２７３８８号公報 特公昭５９−４５０７４号公報 According to this, since the face is pressed by the earth retaining member at the rear end of the mirror fixing bolt other than the mirror fixing bolt during excavation, the face is prevented from collapsing more reliably. However, in this case, it is necessary to excavate the face by avoiding the mirror fixing bolt as in the above-described conventional example, and it is necessary to attach and detach the earth retaining member each time excavation, thereby shortening the construction period. I can't.
JP-A-7-127388 Japanese Patent Publication No.59-45074

本発明は、以上の点に鑑み、土留め部材により切羽の崩れを確実に防止できるようにして、且つ、切羽を能率良く掘削できるようにした鏡止めボルト及びこの鏡止めボルトを用いたトンネル掘削方法を提供することをその課題としている。   In view of the above points, the present invention provides a mirror fixing bolt capable of reliably preventing the face from collapsing by the earth retaining member and excavating the face efficiently, and tunnel excavation using the mirror fixing bolt. The challenge is to provide a method.

上記課題を解決するために、本願の第１発明は、トンネルの切羽に打ち込む鏡止めボルトであって、前後方向に長手のボルト本体と、ボルト本体の後端にボルト本体の径方向外方に突出するように設けられる土留め部材とを備えるものにおいて、土留め部材の前面に切羽を掘削するための刃部が取付けられていることを特徴とする。   In order to solve the above-mentioned problem, the first invention of the present application is a mirror retaining bolt that is driven into a face of a tunnel, and a bolt body that is long in the front-rear direction, and a bolt body at the rear end of the bolt body radially outward. What is provided with the earth retaining member provided so that it may protrude is characterized by attaching the blade part for excavating a face to the front surface of the earth retaining member.

また、本願の第２発明は、上記第１発明の鏡止めボルトを用いたトンネル掘削方法であって、この鏡止めボルトの複数本をトンネルの切羽に打ち込んだ後、各鏡止めボルトを切羽に回転させつつ押し込むことにより、前記土留め部材の前記刃部で切羽を掘削し、鏡止めボルトが打ち込まれていない切羽の部分を掘削手段により掘削することを特徴とする。 The second invention of the present application is a tunnel excavation method using the mirror fixing bolt of the first invention, and after driving a plurality of the mirror fixing bolts into the face of the tunnel, each mirror fixing bolt is used as the face. By pushing in while rotating, the face is excavated by the blade portion of the earth retaining member, and the portion of the face where the mirror fixing bolt is not driven is excavated by excavating means .

本発明によれば、鏡止めボルトの後端の土留め部材により切羽面が押えられ、切羽の崩れが確実に防止される。また、鏡止めボルトを切羽に回転させつつ押し込むことにより、土留め部材の刃部で切羽が掘削される。そのため、鏡止めボルトが掘削の邪魔にならず、切羽を能率良く掘削できる。更に、掘削に際し、土留め部材を一々着脱する必要がなく、切羽の能率的な掘削が可能になることと相俟って、工期の短縮化を図ることができる。   According to the present invention, the face is pressed by the earth retaining member at the rear end of the mirror fixing bolt, and the face is reliably prevented from collapsing. Moreover, the face is excavated by the blade portion of the earth retaining member by pushing the mirror stop bolt while rotating the mirror stop bolt. Therefore, the mirror set bolt does not interfere with excavation, and the face can be excavated efficiently. Furthermore, when excavating, it is not necessary to attach and detach the earth retaining members one by one, and coupled with the fact that the face can be efficiently excavated, the construction period can be shortened.

尚、本発明の鏡止めボルトでは、基本的に土留め部材を着脱する必要はない。但し、土留め部材がボルト本体に着脱自在であれば、土留め部材の刃部が摩耗したときに土留め部材を交換することができ、有利である。   In addition, in the mirror stop bolt of the present invention, it is basically unnecessary to attach or detach the earth retaining member. However, if the retaining member is detachable from the bolt body, it is advantageous that the retaining member can be replaced when the blade portion of the retaining member is worn.

図１及び図２を参照して、１は、砂土や砂質土等の未固結層や崩落性の高い軟岩等から成る軟弱な地山に掘削するトンネルを示している。トンネル１の掘削済みの部分の底面には、コンクリート製のインバート２が築造される。そして、トンネル１の内面に沿わせてアーチ状の鋼製支保工３を建込み、この鋼製支保工３の左右両側部の下端をインバート２の左右両側部に結合して、トンネル断面を閉合している。また、トンネル１の内面にコンクリートを吹き付けて支保コンクリート層４を形成している。更に、トンネル１の周囲の地山に、掘削した周壁面の支保用のロックボルト（図示省略）を支保コンクリート層４を通して放射状に複数打ち込むと共に、斜め前方にのびる先受け鋼管５を打設している。   Referring to FIGS. 1 and 2, reference numeral 1 denotes a tunnel excavated in a soft ground consisting of an unconsolidated layer such as sand or sandy soil or soft rock with high collapsibility. A concrete invert 2 is constructed on the bottom of the excavated portion of the tunnel 1. Then, an arch-shaped steel support 3 is built along the inner surface of the tunnel 1, and the lower ends of the left and right sides of the steel support 3 are joined to the left and right sides of the invert 2 to close the tunnel cross section. is doing. Moreover, concrete is sprayed on the inner surface of the tunnel 1 to form a supporting concrete layer 4. Further, a plurality of rock bolts (not shown) for supporting the excavated peripheral wall surface are radially pierced through the supporting concrete layer 4 in the ground surrounding the tunnel 1 and a receiving steel pipe 5 extending obliquely forward is driven. Yes.

ところで、軟弱な地山では、トンネル１の切羽６の掘削時に、図１（ａ）に仮想線で示すような滑り面ａで切羽地山の滑りを生じ、切羽６が崩れることがある。そこで、切羽６に、トンネル断面の天井部から左右両側部に亘るアーチ状の線に沿って比較的狭い間隔で複数本のルーフ用ロックボルト７´を打ち込んでルーフを形成し、ルーフ形成部分の内側の切羽６の部分に複数本の鏡止めボルト７を打ち込んでいる。これによれば、滑り面ａより奥の地山に対する鏡止めボルト７の前半部分の摩擦で鏡止めボルト７の引抜きが抑制される。そして、この鏡止めボルト７の後半部分と滑り面ａの手前の切羽地山との間の摩擦抵抗で切羽地山が滑り止めされ、切羽６の崩れが防止される。   By the way, in a soft ground, when the face 6 of the tunnel 1 is excavated, the face face 6 may slide on the sliding face a as shown by an imaginary line in FIG. Therefore, a plurality of roof lock bolts 7 'are driven into the face 6 at a relatively narrow interval along an arched line extending from the ceiling portion of the tunnel cross section to the left and right side portions, thereby forming a roof. A plurality of mirror fixing bolts 7 are driven into the inner face 6. According to this, pulling out of the mirror fixing bolt 7 is suppressed by the friction of the first half portion of the mirror fixing bolt 7 with respect to the ground behind the sliding surface a. Then, the face mountain is prevented from slipping by the frictional resistance between the latter half of the mirror retaining bolt 7 and the face mountain before the sliding surface a, and the face 6 is prevented from collapsing.

ここで、鏡止めボルト７は、図３に示す如く、前後方向に長手の鋼管製のボルト本体７１と、ボルト本体７１の前端に固定した、前面に刃部７２ａを取付けた削孔ビット７２と、削孔ビット７２に形成した吐水孔７２ｂに給水するボルト本体７１内の給水パイプ７３と、ボルト本体７１の後端に固定した雄型のジョイント部７４とを備えている。ジョイント部７４には、図示省略した削孔機のドリフタにより前後動及び回転駆動されるロッド８がその前端の雌型のジョイント部８１において着脱自在に連結される。ロッド８は、中空で、内部にジョイント部８１，７４を介して鏡止めボルト７の給水パイプ７３に連通する給水パイプ８２が挿通されている。また、削孔ビット７２には、ボルト本体７１の内部空間に連通する排土孔７２ｃが形成されている。ボルト本体７１の内部空間はジョイント部７４，８１を介してロッド８の内部空間に連通する。   Here, as shown in FIG. 3, the mirror retaining bolt 7 includes a bolt body 71 made of a steel pipe that is long in the front-rear direction, and a drill bit 72 that is fixed to the front end of the bolt body 71 and has a blade portion 72 a attached to the front surface. A water supply pipe 73 in the bolt main body 71 for supplying water to the water discharge hole 72b formed in the drill bit 72 and a male joint portion 74 fixed to the rear end of the bolt main body 71 are provided. A rod 8 that is moved back and forth and rotated by a drifter of a drilling machine (not shown) is detachably connected to the joint 74 at a female joint 81 at the front end thereof. The rod 8 is hollow, and a water supply pipe 82 communicating with the water supply pipe 73 of the mirror fixing bolt 7 is inserted through the joint portions 81 and 74 inside. In addition, the drill bit 72 is formed with a drain hole 72 c that communicates with the internal space of the bolt body 71. The internal space of the bolt main body 71 communicates with the internal space of the rod 8 via joint portions 74 and 81.

切羽６への鏡止めボルト７の打ち込みに際しては、鏡止めボルト７の後端のジョイント部７４にロッド８の前端のジョイント部８１を連結し、この状態でロッド８を回転させつつ前進させる。これにより、鏡止めボルト７は切羽６に削孔ビット７２で削孔しつつ打ち込まれる。削孔部分の土は削孔ビット７２の吐水孔７２ｂからの水と混合して泥水となり、削孔ビット７２の排土孔７２ｃから鏡止めボルト７の内部空間とロッド８の内部空間とを介して排出される。   When driving the mirror stop bolt 7 into the face 6, the joint portion 81 at the front end of the rod 8 is connected to the joint portion 74 at the rear end of the mirror stop bolt 7, and the rod 8 is advanced while rotating in this state. Thereby, the mirror set bolt 7 is driven into the face 6 while drilling with the drill bit 72. The soil in the drilling portion mixes with the water from the water discharge hole 72b of the drilling bit 72 to become muddy water, and passes through the internal space of the mirror fixing bolt 7 and the internal space of the rod 8 from the soil discharge hole 72c of the drilling bit 72. Discharged.

尚、ルーフ用ロックボルト７´の構造も鏡止めボルト７の上述した構造と同様であり、ロッド８を用いて切羽６に打ち込まれる。   The structure of the roof lock bolt 7 ′ is the same as the structure of the mirror fixing bolt 7 described above, and is driven into the face 6 using the rod 8.

但し、鏡止めボルト７は、ルーフ用ロックボルト７´と異なり、ボルト本体７１の後端のジョイント部７４に着脱自在に螺着される土留め部材７５を備えている。土留め部材７５は、図２に示す如くボルト本体７１の径方向外方に放射状に突出する４個のアーム部を有する十字状に形成されている。また、土留め部材７５の前面には、図３に示す如く刃部７５ａが取付けられている。   However, unlike the roof locking bolt 7 ′, the mirror fixing bolt 7 includes an earth retaining member 75 that is detachably screwed to the joint portion 74 at the rear end of the bolt main body 71. As shown in FIG. 2, the earth retaining member 75 is formed in a cross shape having four arm portions projecting radially outward in the radial direction of the bolt main body 71. Further, a blade portion 75a is attached to the front surface of the earth retaining member 75 as shown in FIG.

上述したように鏡止めボルト７の後半部分と滑り面ａの手前の切羽地山との間の摩擦抵抗で切羽地山がある程度は滑り止めされるが、土留め部材７５を設ければ、切羽面（切羽６の端面）が土留め部材７５で押えられ、切羽６の崩れをより確実に防止できる。尚、鏡止めボルト７は、隣接する鏡止めボルト７，７の土留め部材７５，７５同士が干渉しないような間隔を存して切羽６に打ち込まれる。   As described above, the face mountain is prevented from slipping to some extent by the frictional resistance between the latter half of the mirror fixing bolt 7 and the face face mountain before the sliding surface a. The surface (the end surface of the face 6) is pressed by the earth retaining member 75, so that the face 6 can be more reliably prevented from collapsing. The mirror fixing bolt 7 is driven into the face 6 with an interval such that the earth retaining members 75 and 75 of the adjacent mirror fixing bolts 7 and 7 do not interfere with each other.

切羽６の掘削に際しては、先ず、図１（ａ）に示す如く切羽６に打ち込まれている鏡止めボルト７のうち最も上方に位置する鏡止めボルト７をロッド８により切羽６に回転させつつ所定ストローク押し込む。これによれば、土留め部材７５の刃部７５ａにより切羽６が掘削されて図１（ｂ）に示す状態になる。そして、鏡止めボルト７を上方のものから順に切羽６に回転させつつ押し込むことにより、切羽６が上部から下部に向かって順に掘削される。   When excavating the face 6, first, as shown in FIG. 1A, the uppermost mirror fixing bolt 7 driven into the face 6 is rotated to the face 6 by a rod 8 and is rotated to a predetermined position. Push in the stroke. According to this, the cutting face 6 is excavated by the blade part 75a of the earth retaining member 75, and the state shown in FIG. And the face 6 is excavated in order from the upper part to the lower part by pushing in while rotating the mirror stop bolt 7 to the face 6 in order from the upper one.

次に、鏡止めボルト７が打ち込まれていない切羽６の最下部を適宜の掘削手段により掘削する。そして、図１（ｃ）に示す如く、今回掘削した部分の底面にコンクリートを打設又は吹き付けしてインバート２を築造すると共に、インバート２の左右両側部に、今回掘削した部分の左右両側面に沿ってルーフ形成部分の左右両側部の下端と同等高さまで立ち上がる立上り壁２ａを形成する。尚、立上り壁２ａは、インバート２の各側部に鋼製の短尺支保工３ａを植設した後コンクリートを吹き付けることで形成される。   Next, the lowermost part of the face 6 where the mirror fixing bolt 7 is not driven is excavated by appropriate excavating means. Then, as shown in FIG. 1 (c), the invert 2 is constructed by placing or spraying concrete on the bottom surface of the portion excavated this time, and on the left and right sides of the invert 2 on the left and right sides of the excavated portion. A rising wall 2a that rises to the same height as the lower ends of the left and right sides of the roof forming portion is formed. The rising wall 2a is formed by spraying concrete after planting a short steel support 3a on each side of the invert 2.

次に、切羽６のルーフ形成部分を掘削した後、ルーフ用ロックボルト７´を掘削後の切羽６に押し込む。そして、図１（ｄ）に示す如く、今回掘削した部分の天井面から左右両側面に亘りアーチ状の鋼製支保工３を建込んで、この鋼製支保工３の左右両側部の下端をインバート２の左右両側部の立上り壁２ａに結合すると共に、コンクリートの吹き付けで支保コンクリート層４を形成する。以上の作業を繰り返して、トンネル１の掘削を進めて行く。   Next, after excavating the roof forming portion of the face 6, the roof lock bolt 7 ′ is pushed into the face 6 after excavation. And as shown in FIG.1 (d), the arch-shaped steel support 3 is built over the right-and-left both sides from the ceiling surface of the part excavated this time, and the lower end of the right and left both sides of this steel support 3 is attached. The support concrete layer 4 is formed by spraying concrete while being coupled to the rising walls 2a on both the left and right sides of the invert 2. The tunnel 1 is excavated by repeating the above operations.

ここで、ルーフ形成部分はルーフ用ロックボルト７´を避けて掘削する必要があるが、ルーフ形成部分の断面積は小さいため、掘削に然程時間はかからない。一方、ルーフ形成部分の内側の切羽６の部分は断面積が広く、この部分の掘削を鏡止めボルト７を避けて行ったのでは、掘削にかなり時間がかかる。然し、本実施形態では、鏡止めボルト７を切羽６に回転させつつ押し込むことにより、土留め部材７５の刃部７５ａで切羽６が掘削される。そのため、鏡止めボルト７が掘削の邪魔にならず、切羽６を能率良く掘削できる。更に、掘削に際し、土留め部材７５を一々着脱する必要がなく、切羽６の能率的な掘削が可能になることと相俟って、工期の短縮化を図ることができる。   Here, it is necessary to excavate the roof forming portion while avoiding the roof lock bolt 7 ', but since the cross-sectional area of the roof forming portion is small, excavation does not take much time. On the other hand, the face 6 inside the roof forming part has a large cross-sectional area, and if this part is excavated while avoiding the mirror stop bolt 7, the excavation takes much time. However, in the present embodiment, the face 6 is excavated by the blade portion 75 a of the earth retaining member 75 by pushing the mirror stop bolt 7 while rotating it on the face 6. Therefore, the mirror set bolt 7 does not interfere with excavation, and the face 6 can be excavated efficiently. Further, when excavating, it is not necessary to attach and remove the earth retaining member 75 one by one, and coupled with the fact that efficient excavation of the face 6 is possible, the construction period can be shortened.

また、土留め部材７５は、着脱する必要がないため、ボルト本体７１に一体化されていても良い。但し、本実施形態の如く土留め部材７５をボルト本体７１に着脱自在とすれば、刃部７５ａが摩耗したときに、土留め部材７５を新たなものに交換でき、有利である。   Moreover, since the earth retaining member 75 does not need to be attached or detached, it may be integrated with the bolt main body 71. However, if the earth retaining member 75 is detachable from the bolt body 71 as in the present embodiment, it is advantageous that the earth retaining member 75 can be replaced with a new one when the blade portion 75a is worn.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、上記実施形態では、鏡止めボルト７として削孔ビット７２付きのものを用いたが、前端を先鋭に形成した圧入式のロックボルトを用いることも可能である。また、上記実施形態では、土留め部材７５が４個のアーム部を有する十字状に形成されているが、アーム部の数は３個或いは５個以上であっても良く、更には、土留め部材７５を円板状に形成することも可能である。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above embodiment, the mirror locking bolt 7 with the drilling bit 72 is used, but a press-fit lock bolt having a sharp front end may be used. Further, in the above embodiment, the earth retaining member 75 is formed in a cross shape having four arm portions, but the number of arm portions may be three or more, and furthermore, the earth retaining member It is also possible to form the member 75 in a disc shape.

更に、上記実施形態では、鏡止めボルト７として鋼管を用いたが、棒状のものを用いることも可能である。その材質も鋼製に限らず、繊維補強プラスチック（ＦＲＰ）製など一定以上の剛性を有するあらゆるものが適用可能である。   Furthermore, in the said embodiment, although the steel pipe was used as the mirror stop bolt 7, a rod-shaped thing can also be used. The material is not limited to steel, and any material having a certain level of rigidity such as fiber reinforced plastic (FRP) can be used.

また、打ち込み及び押し込みの状況に応じて、鏡止めボルトの周囲に固化剤を注入して、ボルトと地山との摩擦抵抗の増大を図るようにしてもよい。この場合、鏡止めボルトの押し込み時にボルトと地山との剥離が良好に行えるよう、固化剤の材質を選定することが望ましい。   In addition, a solidifying agent may be injected around the mirror fixing bolt according to the driving and pushing conditions to increase the frictional resistance between the bolt and the ground. In this case, it is desirable to select a material for the solidifying agent so that the bolt and the ground can be peeled well when the mirror fixing bolt is pushed.

本発明の実施形態の掘削方法を示すトンネルの縦断面図。The longitudinal cross-sectional view of the tunnel which shows the excavation method of embodiment of this invention. トンネルの横断面図。The cross-sectional view of a tunnel. 本発明の実施形態の鏡止めボルトを示す縦断面図。The longitudinal cross-sectional view which shows the mirror stop bolt of embodiment of this invention.

符号の説明Explanation of symbols

１…トンネル、６…切羽、７…鏡止めボルト、７１…ボルト本体、７５…土留め部材、７５ａ…刃部。   DESCRIPTION OF SYMBOLS 1 ... Tunnel, 6 ... Face, 7 ... Mirror stop bolt, 71 ... Bolt main body, 75 ... Earth retaining member, 75a ... Blade part.

Claims (3)

トンネルの切羽に打ち込む鏡止めボルトであって、前後方向に長手のボルト本体と、ボルト本体の後端にボルト本体の径方向外方に突出するように設けられる土留め部材とを備えるものにおいて、
土留め部材の前面に切羽を掘削するための刃部が取付けられていることを特徴とする鏡止めボルト。 A mirror retaining bolt driven into the face of the tunnel, comprising a bolt body that is long in the front-rear direction, and a retaining member that is provided at the rear end of the bolt body so as to protrude outward in the radial direction of the bolt body.
A mirror retaining bolt, wherein a blade portion for excavating a face is attached to the front surface of the earth retaining member. 前記土留め部材は前記ボルト本体に着脱自在であることを特徴とする請求項１記載の鏡止めボルト。   The mirror retaining bolt according to claim 1, wherein the earth retaining member is detachably attached to the bolt body. 請求項１又は２記載の鏡止めボルトを用いたトンネル掘削方法であって、
この鏡止めボルトの複数本をトンネルの切羽に打ち込んだ後、各鏡止めボルトを切羽に回転させつつ押し込むことにより、前記土留め部材の前記刃部で切羽を掘削し、鏡止めボルトが打ち込まれていない切羽の部分を掘削手段により掘削することを特徴とするトンネル掘削方法。 A tunnel excavation method using the mirror fixing bolt according to claim 1 or 2,
After driving a plurality of these mirror stop bolts into the face of the tunnel, each mirror stop bolt is pushed into the face while being rotated, so that the face is excavated by the blade portion of the earth retaining member, and the mirror stop bolt is driven. A tunnel excavation method characterized by excavating an uncut face portion by excavation means .
JP2007228225A 2007-09-03 2007-09-03 Mirror bolt and tunnel excavation method Expired - Fee Related JP4769961B2 (en)

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JPS5945074B2 (en) * 1981-09-30 1984-11-02 株式会社間組 Tunnel face excavation method
JPH07127388A (en) * 1993-10-28 1995-05-16 Penta Ocean Constr Co Ltd Face shuttering method in tunnel excavation and bolts
JP3069234B2 (en) * 1994-02-17 2000-07-24 株式会社熊谷組 Rock mass slide prevention structure in mirror
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