JP2015086584A - Steel support - Google Patents

Steel support Download PDF

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JP2015086584A
JP2015086584A JP2013225662A JP2013225662A JP2015086584A JP 2015086584 A JP2015086584 A JP 2015086584A JP 2013225662 A JP2013225662 A JP 2013225662A JP 2013225662 A JP2013225662 A JP 2013225662A JP 2015086584 A JP2015086584 A JP 2015086584A
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steel support
shotcrete
flange
steel
support
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熊坂 博夫
Hiroo Kumasaka
博夫 熊坂
圭 薬師寺
Kei Yakushiji
圭 薬師寺
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Shimizu Construction Co Ltd
Shimizu Corp
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Shimizu Construction Co Ltd
Shimizu Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a steel support that can be integrated with sprayed concrete and that improves workability.SOLUTION: A steel support 10 for being used as a support for natural ground of a tunnel together with sprayed concrete is made of H-shaped steel formed in such a shape as to have an H-shaped cross-section. A through-hole 18 is provided in a flange 12 that is arranged on a side, near a natural ground, of the H-shaped steel. The sprayed concrete can pass to a surface side 12b, facing a natural ground surface, of the flange 12 from a surface side 12a, not facing the natural ground surface, of the flange 12 through the through-hole 18.

Description

本発明は、山岳トンネルの標準工法などにおいて用いられる鋼製支保工に関するものである。   The present invention relates to a steel support used in a standard method for mountain tunnels.

従来、山岳トンネルの標準工法によって施工されるトンネルとして、図6に示されるように、内面が一次支保工1、二次覆工2、インバート工3によって巻き立てられているものがある。このうち、一次支保工の部材としては、吹付けコンクリート、鋼製支保工、ロックボルト等が用いられている。これらの一次支保工の部材は、トンネル掘削に伴う切羽近傍での天端・側壁部の崩落の抑制や防止、および、切羽が通過した後のトンネル周辺地山の押し出し変形などに対する周辺地山の安定性の確保をする目的で使用される。   Conventionally, as a tunnel constructed by a standard method of a mountain tunnel, there is a tunnel whose inner surface is wound up by a primary support 1, a secondary lining 2, and an invert 3 as shown in FIG. Of these, shot concrete, steel support, rock bolts, and the like are used as primary support members. These primary support members are used to control and prevent the collapse of the top and side walls near the face due to tunnel excavation, and to prevent the surrounding ground from being pushed out and deformed after the face has passed. Used for the purpose of ensuring stability.

この中で、鋼製支保工は、トンネル周辺地山に密着するようにリング状に設置され、吹付けコンクリートと一体となって、トンネル軸方向に連続した薄肉のアーチ構造を形成し、トンネル周辺地山と支保構造物により形成されるトンネル構造体の安定を図るために用いられる(例えば、特許文献1〜3を参照)。   Among them, the steel support is installed in a ring shape so as to be in close contact with the ground around the tunnel, and is integrated with the shotcrete to form a thin-walled arch structure continuous in the tunnel axis direction. It is used to stabilize the tunnel structure formed by the natural ground and the supporting structure (see, for example, Patent Documents 1 to 3).

鋼製支保工は鋼材を用いることから、セメント材料を利用する吹付けコンクリートやロックボルトに比べ、建込み直後の周辺地山の崩落や変形抑止に対する支保効果が高いと考えられている。そのため、切羽掘削直後のトンネル・周辺地山の安定性を確保することを目的に用いられている。   Since steel supports use steel, they are considered to have a higher support effect against collapse and deformation prevention of surrounding ground immediately after construction than shotcrete and rock bolts using cement materials. Therefore, it is used for the purpose of ensuring the stability of the tunnel and surrounding ground immediately after face excavation.

一方、近年、支保工の一つである吹付けコンクリートにおいて、切羽直後の吹付け後、短時間で強度と剛性が高まるような材料が開発され、地山のはく落、崩壊および変形に対する抑止等の支保性能が高くなってきている。この吹付けコンクリートは押し出し性の大きな地山のトンネルにおいても使用されている。   On the other hand, in recent years, in shotcrete, which is one of the support works, a material that has increased strength and rigidity in a short time after spraying immediately after the face has been developed, such as deterring the collapse, collapse and deformation of natural ground Support performance is getting higher. This shotcrete is also used in tunnels with large extrudability.

特開平5−86800号公報JP-A-5-86800 特開平7−97899号公報Japanese Unexamined Patent Publication No. 7-97899 特開平8−232589号公報JP-A-8-232589 特開2013−167069号公報JP 2013-167069 A

一次支保工部材である鋼製支保工と吹付けコンクリートは、様々な支保効果が期待されている。これらの部材は、周辺地山からの半径方向の地圧を主に部材に発生する断面力である軸力・軸応力に変換することで支保効果を発揮する。各部材に生じる軸応力は、主に、各部材の軸剛性に応じて分担される。   The steel support and shotcrete, which are primary support members, are expected to have various support effects. These members exhibit a supporting effect by converting a radial ground pressure from a surrounding natural ground into an axial force / axial stress which is a sectional force generated mainly in the member. The axial stress generated in each member is shared mainly according to the axial rigidity of each member.

しかしながら、既往のトンネル建設時の計測結果では、鋼製支保工の持つ軸剛性に比べて、計測される軸力・軸応力は小さいことが知られている。   However, it is known that the measured axial force and axial stress are smaller than the axial rigidity of the steel support in the measurement results of the existing tunnel construction.

この理由の一つとして、掘削直後に地山壁面の浮きはく落の防止と掘削面の平滑化を目的とした厚さ5cm程度の一次吹付けコンクリートの施工が行われるが、図7に示されるように、この一次吹付けコンクリート4によっても地山5の掘削面5aの平滑化を十分に行なうことが難しい場合があり、後工程で鋼製支保工6を建込んだときに、吹付け施工面4aと鋼製支保工6とが隙間なく均一に接触しないことで荷重分布が不均等な状態となり、鋼製支保工6が本来受けるべき地圧を十分に受けることができないことが原因の一つと考えられる。   One reason for this is that primary spray concrete of approximately 5 cm in thickness is constructed immediately after excavation for the purpose of preventing floating flaking of the natural ground wall and smoothing the excavation surface, as shown in FIG. In addition, it may be difficult to sufficiently smooth the excavation surface 5a of the natural ground 5 even with the primary sprayed concrete 4, and when the steel support 6 is built in a later process, One of the reasons is that the load distribution becomes uneven because 4a and the steel support 6 are not evenly contacted with no gap, and the steel support 6 cannot sufficiently receive the ground pressure that it should originally receive. Conceivable.

例えば、鋼製支保工としてH型鋼を用いる場合には、図8(a)に示すように、鋼製支保工6と吹付けコンクリート(一次吹付けコンクリート4および二次吹付けコンクリート7)とが一体化することが本来望ましい。しかしながら、図8(b)に示すように、鋼製支保工6の背面側6aにおいて、鋼製支保工6と一次吹付けコンクリート4との間に空隙Sが生じる場合もある。   For example, when H-shaped steel is used as the steel support, as shown in FIG. 8 (a), the steel support 6 and shotcrete (primary shot concrete 4 and secondary shot concrete 7) are It is inherently desirable to integrate. However, as shown in FIG. 8B, a gap S may be generated between the steel support 6 and the primary sprayed concrete 4 on the back side 6 a of the steel support 6.

こうしたことから、鋼製支保工が地山から一様な地圧を受け得るように、鋼製支保工の建込み後に行なわれる二次吹付けコンクリートの施工の際に吹付けコンクリートと鋼製支保工との一体化を図るための技術が望まれていた。   Therefore, in order to allow the steel support to receive uniform ground pressure from the natural ground, the shotcrete and the steel support are applied during the construction of the secondary shotcrete after the steel support is installed. A technique for integrating with the work was desired.

これに対し、本願発明者の一人は、既に特許文献4に示すような鋼製支保工を提案しているが、加工性をより一層向上することが求められていた。   On the other hand, one of the inventors of the present application has already proposed a steel support as shown in Patent Document 4, but has been demanded to further improve the workability.

本発明は、上記に鑑みてなされたものであって、吹付けコンクリートとの一体化を図ることができるとともに、加工性が向上した鋼製支保工を提供することを目的とする。   The present invention has been made in view of the above, and an object of the present invention is to provide a steel support that can be integrated with shotcrete and has improved workability.

上記した課題を解決し、目的を達成するために、本発明に係る鋼製支保工は、トンネルの地山の支保工として、吹付けコンクリートとともに用いられる鋼製支保工であって、断面H型に形成されたH型鋼からなり、前記H型鋼の地山に近い側に配置するフランジに貫通孔を設け、前記貫通孔を通じて前記吹付けコンクリートが前記フランジの地山面に対向しない面側から地山面に対向する面側に通り抜け可能にしたことを特徴とする。   In order to solve the above-described problems and achieve the object, a steel support according to the present invention is a steel support used together with shotcrete as a support for a natural ground in a tunnel, and has an H-shaped section. A through hole is provided in a flange disposed on the side close to the ground of the H-shaped steel, and the shotcrete is grounded from the surface side not facing the ground surface of the flange through the through hole. It is possible to pass through the surface facing the mountain surface.

また、本発明に係る他の鋼製支保工は、上述した発明において、前記貫通孔の孔径を、前記吹付けコンクリートの最大骨材寸法よりも大きくしたことを特徴とする。   Another steel support according to the present invention is characterized in that, in the above-described invention, the diameter of the through hole is larger than the maximum aggregate size of the shotcrete.

また、本発明に係る他の鋼製支保工は、上述した発明において、前記貫通孔を、所定間隔で複数設けたことを特徴とする。   Another steel support according to the present invention is characterized in that, in the above-described invention, a plurality of the through holes are provided at a predetermined interval.

本発明に係る鋼製支保工によれば、トンネルの地山の支保工として、吹付けコンクリートとともに用いられる鋼製支保工であって、断面H型に形成されたH型鋼からなり、前記H型鋼の地山に近い側に配置するフランジに貫通孔を設け、前記貫通孔を通じて前記吹付けコンクリートが前記フランジの地山面に対向しない面側から地山面に対向する面側に通り抜け可能にしたので、建込んだ鋼製支保工の背面側に仮に空隙が生じていたとしても、後工程の吹付けコンクリートの施工の際に吹付けコンクリートが貫通孔を通じてフランジの地山面に対向しない面側から地山面に対向する面側に通り抜け、鋼製支保工の背面側の空隙に入り込んでここを容易に充填することができるという効果を奏する。   According to the steel support according to the present invention, it is a steel support used together with shotcrete as a support for a natural ground of a tunnel, and is made of an H-shaped steel formed in an H-shaped section, and the H-shaped steel. A through hole is provided in the flange arranged on the side close to the natural ground, and the shotcrete can pass through the through hole from the surface side not facing the natural ground surface of the flange to the surface side facing the natural ground surface. Therefore, even if there is a gap on the back side of the built steel support, the surface side where the shotcrete does not face the ground surface of the flange through the through-hole when constructing the shotcrete in the subsequent process It passes through the surface opposite to the natural ground surface, enters the gap on the back side of the steel support, and can be filled easily here.

また、鋼製支保工の背面側の空隙がなくなり、鋼製支保工と吹付けコンクリートとの一体化が図られることで、鋼製支保工全体にわたって地山からの地圧を均等に受けやすくなる。これにより、従来よりも高い支保能力(地圧に対する耐荷能力)を発揮することができる。   In addition, there is no gap on the back side of the steel support, and the steel support and shotcrete are integrated, making it easier to receive ground pressure from the natural ground evenly throughout the steel support. . Thereby, the supporting ability (load bearing ability with respect to a ground pressure) higher than before can be exhibited.

また、本発明は、フランジに貫通孔を設ける加工だけで足りることから、従来の特許文献4に示すようなフランジを変形加工して得られる鋼製支保工に比べて、加工性を向上することができる。したがって、本発明によれば、吹付けコンクリートとの一体化を図ることができるとともに、加工性が向上した鋼製支保工を提供することができるという効果を奏する。   In addition, since the present invention only needs to provide a through-hole in the flange, the workability is improved as compared to a steel support obtained by deforming the flange as shown in Patent Document 4 of the related art. Can do. Therefore, according to this invention, while integrating with shotcrete, it is effective in the ability to provide the steel support which improved workability.

また、本発明に係る他の鋼製支保工によれば、前記貫通孔の孔径を、前記吹付けコンクリートの最大骨材寸法よりも大きくしたので、上記の効果に加え、鋼製支保工を建込んだ後の吹付けコンクリートが鋼製支保工の背面側に通り抜けやすくなり、空隙への吹付けコンクリートの充填性をより確実にすることができるという効果を奏する。   Further, according to another steel support according to the present invention, since the hole diameter of the through hole is larger than the maximum aggregate size of the shotcrete, in addition to the above effects, the steel support is constructed. It becomes easy for the shotcrete after being inserted to pass through to the back side of the steel support, and the filling property of the shotcrete into the gap can be more reliably ensured.

また、本発明に係る他の鋼製支保工によれば、前記貫通孔を、所定間隔で複数設けたので、上記の効果に加え、鋼製支保工を建込んだ後の吹付けコンクリートがより効率的に鋼製支保工の背面側に通り抜けやすくなり、空隙への吹付けコンクリートの充填性をより一層確実にすることができるという効果を奏する。   In addition, according to another steel support according to the present invention, since the plurality of through holes are provided at a predetermined interval, in addition to the above effects, the shotcrete after the steel support is installed is more It is easy to efficiently pass through to the back side of the steel support work, and there is an effect that the filling property of the shotcrete into the gap can be further ensured.

図1は、本発明に係る鋼製支保工の実施例を示す斜視図である。FIG. 1 is a perspective view showing an embodiment of a steel support according to the present invention. 図2は、本発明に係る鋼製支保工と吹付けコンクリートの接触状況を示す縦断面図である。FIG. 2 is a longitudinal sectional view showing a contact state between the steel support and the shotcrete according to the present invention. 図3は、本発明に係る鋼製支保工を適用したトンネルの概略横断面図である。FIG. 3 is a schematic cross-sectional view of a tunnel to which the steel support according to the present invention is applied. 図4は、本発明に係る鋼製支保工の建込み直後の状況を示す縦断面図である。FIG. 4 is a longitudinal sectional view showing a situation immediately after the construction of the steel support according to the present invention. 図5は、本発明に係る鋼製支保工の建込み後の二次吹付けコンクリートの施工状況を示す縦断面図である。FIG. 5: is a longitudinal cross-sectional view which shows the construction condition of the secondary shotcrete after construction of the steel support construction which concerns on this invention. 図6は、従来のトンネルの概略横断面図である。FIG. 6 is a schematic cross-sectional view of a conventional tunnel. 図7は、従来の鋼製支保工と一次吹付けコンクリートの接触状況を示す横断面図である。FIG. 7 is a cross-sectional view showing a contact state between a conventional steel support and primary shotcrete. 図8は、従来のH型鋼からなる鋼製支保工と吹付けコンクリートの接触状況を示す縦断面図であり、(a)は鋼製支保工と吹付けコンクリートがよく一体化している場合、(b)は鋼製支保工の背面の吹付けコンクリートに空隙がある場合である。FIG. 8 is a longitudinal sectional view showing a contact state between a steel support made of conventional H-shaped steel and shotcrete, and (a) is a case where the steel support and shotcrete are well integrated, b) is the case where there is a gap in the shotcrete on the back of the steel support.

以下に、本発明に係る鋼製支保工の実施の形態を図面に基づいて詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。   Hereinafter, embodiments of a steel support according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

図1に示すように、本発明に係る鋼製支保工10は、トンネルの地山の支保工として、吹付けコンクリートとともに用いられる鋼製支保工であって、上下2つのフランジ12、14とウェブ16とにより断面H型に形成されたH型鋼からなり、一方のフランジ12に複数の貫通孔18を設けたものである。   As shown in FIG. 1, a steel support 10 according to the present invention is a steel support used together with shotcrete as a support for a natural ground in a tunnel, and includes two upper and lower flanges 12 and 14 and a web. 16 and a plurality of through-holes 18 in one flange 12.

図2および図3に示すように、貫通孔18を有するフランジ12は、地山5に近い側、すなわち前工程で地山5に吹き付けられた一次吹付けコンクリート20に近い側に配置されるフランジである。この貫通孔18を通じて後工程の二次吹付けコンクリート22がフランジ12の内側12a(地山面5aに対向しない面側)から外側12b(地山面5aに対向する面側)に通り抜け可能となっている。   As shown in FIGS. 2 and 3, the flange 12 having the through hole 18 is disposed on the side close to the natural ground 5, that is, on the side close to the primary shotcrete 20 sprayed on the natural ground 5 in the previous step. It is. Through this through-hole 18, the secondary shot concrete 22 in the subsequent process can pass from the inner side 12 a (surface side not facing the ground surface 5 a) of the flange 12 to the outer side 12 b (surface side facing the ground surface 5 a). ing.

各貫通孔18の孔径は、二次吹付けコンクリート22の最大骨材寸法よりも大きくしてある。こうすることで、鋼製支保工10を建込んだ後の二次吹付けコンクリート22が鋼製支保工10の背面側に通り抜けやすくなり、この背面側に生じている空隙Sへの二次吹付けコンクリート22の充填性をより確実にすることができる。なお、貫通孔18をフランジ12に複数設けることで、鋼製支保工10を建込んだ後の二次吹付けコンクリート22がより効率的に鋼製支保工10の背面側に通り抜けやすくなり、空隙Sへの二次吹付けコンクリート22の充填性をより一層確実にすることができる。   The diameter of each through hole 18 is larger than the maximum aggregate size of the secondary shot concrete 22. By doing so, the secondary shotcrete 22 after the steel support 10 is built can easily pass through to the back side of the steel support 10, and the secondary blown into the gap S generated on the back side. The filling property of the attached concrete 22 can be further ensured. In addition, by providing a plurality of through holes 18 in the flange 12, the secondary shot concrete 22 after the steel support 10 is installed can more easily pass through to the back side of the steel support 10, and the gap The fillability of the secondary shotcrete 22 into S can be further ensured.

ここで、貫通孔18は、本実施例ではウェブ16との接続部を挟んでフランジ12の両側部分に、フランジ12の延在方向に沿ってそれぞれ等間隔で5個ずつ一列に配置した場合を示しているが、本発明はこれに限るものではない。例えば、これ以外の数の貫通孔18を配置してもよいし、各貫通孔18を異なる間隔で配置してもよい。また、フランジ12の両側部分にそれぞれ一列に配置する態様に限らず、複数列に配置したり、あるいは千鳥配置としてもよく、さらにその他の任意の配置レイアウトを採用してもよい。また、貫通孔18の形状も円形に限らず、四角形やその他の任意の形状を採用してもよい。   Here, in the present embodiment, the case where five through holes 18 are arranged in a row at equal intervals along the extending direction of the flange 12 on both side portions of the flange 12 across the connecting portion with the web 16. Although shown, the present invention is not limited to this. For example, other numbers of through holes 18 may be arranged, or the through holes 18 may be arranged at different intervals. Moreover, it is not restricted to the aspect arrange | positioned in the row | line | column both sides of the flange 12, respectively, You may arrange | position to multiple rows, or may be staggered arrangement | positioning, Furthermore, you may employ | adopt other arbitrary arrangement layouts. Further, the shape of the through hole 18 is not limited to a circle, and may be a quadrangle or any other shape.

上記構成の動作および作用について図4および図5を参照しながら説明する。
まず、図4に示すように、地山面5aに一次吹付けコンクリート20を吹付け施工した後、貫通孔18を有するフランジ12が一次吹付けコンクリートの施工面20aに近い側に位置するように鋼製支保工10を建込む。このとき、鋼製支保工10の背面側の施工面20aとの間に仮に空隙Sが生じていたとする。
The operation and action of the above configuration will be described with reference to FIGS.
First, as shown in FIG. 4, after the primary shotcrete 20 is sprayed on the ground surface 5a, the flange 12 having the through holes 18 is positioned on the side close to the primary shotcrete construction surface 20a. A steel support 10 is installed. At this time, it is assumed that there is a gap S between the rear surface of the steel support 10 and the construction surface 20a.

次に、図5に示すように、鋼製支保工10のフランジ14が位置する側から、施工面20aに向けて二次吹付けコンクリート22を吹付け施工する。この吹付け施工の際に、二次吹付けコンクリート22がフランジ12の貫通孔18を通じて内側12aから外側12bに通り抜け、鋼製支保工10の背面側の空隙Sに入り込むので、空隙Sを二次吹付けコンクリート22で容易に充填することができる。   Next, as shown in FIG. 5, the secondary shotcrete 22 is sprayed from the side where the flange 14 of the steel support 10 is located toward the construction surface 20 a. At the time of this spraying construction, the secondary shotcrete 22 passes from the inner side 12a to the outer side 12b through the through hole 18 of the flange 12, and enters the gap S on the back side of the steel support 10 so that the gap S is secondary. Can be easily filled with shotcrete 22.

鋼製支保工10の背面側の空隙Sがなくなることで、鋼製支保工10と一次および二次吹付けコンクリート20、22とが十分に接触して一体化が図られ、鋼製支保工10全体にわたって周辺の地山5からの地圧(荷重)を均等に受けやすくなる。これにより、本発明によれば、従来よりも高い支保能力(地圧に対する耐荷能力)を発揮することができる。   By eliminating the gap S on the back side of the steel support 10, the steel support 10 and the primary and secondary sprayed concrete 20 and 22 are sufficiently brought into contact with each other to be integrated. It becomes easy to receive the earth pressure (load) from the surrounding natural ground 5 equally throughout. Thereby, according to this invention, higher support ability (load-proof ability with respect to a ground pressure) than before can be exhibited.

また、本発明の鋼製支保工10は、フランジ12に貫通孔18を設ける加工だけで足りることから、従来の特許文献4に示すようなフランジを変形加工して得られる鋼製支保工に比べて、加工性を向上することができる。したがって、本発明によれば、吹付けコンクリートとの一体化を図ることができるとともに、加工性が向上した鋼製支保工を提供することができるという効果を奏する。   Moreover, since the steel support 10 of the present invention only needs to provide the through holes 18 in the flange 12, it is compared with the steel support obtained by deforming the flange as shown in Patent Document 4 of the related art. Thus, workability can be improved. Therefore, according to this invention, while integrating with shotcrete, it is effective in the ability to provide the steel support which improved workability.

以上説明したように、本発明に係る鋼製支保工によれば、トンネルの地山の支保工として、吹付けコンクリートとともに用いられる鋼製支保工であって、断面H型に形成されたH型鋼からなり、前記H型鋼の地山に近い側に配置するフランジに貫通孔を設け、前記貫通孔を通じて前記吹付けコンクリートが前記フランジの地山面に対向しない面側から地山面に対向する面側に通り抜け可能にしたので、建込んだ鋼製支保工の背面側に仮に空隙が生じていたとしても、後工程の吹付けコンクリートの施工の際に吹付けコンクリートが貫通孔を通じてフランジの地山面に対向しない面側から地山面に対向する面側に通り抜け、鋼製支保工の背面側の空隙に入り込んでここを容易に充填することができるという効果を奏する。   As described above, the steel support according to the present invention is a steel support used together with shotcrete as a support for a natural ground in a tunnel, and is an H-shaped steel formed in an H-shaped section. A through hole is provided in the flange disposed on the side close to the ground of the H-shaped steel, and the surface facing the ground surface from the surface side through which the sprayed concrete does not face the ground surface of the flange. Even if there is a gap on the back side of the steel support that has been built, the shotcrete will be passed through the through hole in the ground of the flange even if there is a gap on the back side. There is an effect that it passes from the surface side not facing the surface to the surface side facing the natural ground surface, enters the gap on the back surface side of the steel support and can be easily filled here.

また、鋼製支保工の背面側の空隙がなくなり、鋼製支保工と吹付けコンクリートとの一体化が図られることで、鋼製支保工全体にわたって地山からの地圧を均等に受けやすくなる。これにより、従来よりも高い支保能力(地圧に対する耐荷能力)を発揮することができる。   In addition, there is no gap on the back side of the steel support, and the steel support and shotcrete are integrated, making it easier to receive ground pressure from the natural ground evenly throughout the steel support. . Thereby, the supporting ability (load bearing ability with respect to a ground pressure) higher than before can be exhibited.

また、本発明は、フランジに貫通孔を設ける加工だけで足りることから、従来の特許文献4に示すようなフランジを変形加工して得られる鋼製支保工に比べて、加工性を向上することができる。したがって、本発明によれば、吹付けコンクリートとの一体化を図ることができるとともに、加工性が向上した鋼製支保工を提供することができる。   In addition, since the present invention only needs to provide a through-hole in the flange, the workability is improved as compared to a steel support obtained by deforming the flange as shown in Patent Document 4 of the related art. Can do. Therefore, according to this invention, while being able to aim at integration with shotcrete, the steel support construction with improved workability can be provided.

また、本発明に係る他の鋼製支保工によれば、前記貫通孔の孔径を、前記吹付けコンクリートの最大骨材寸法よりも大きくしたので、上記の効果に加え、鋼製支保工を建込んだ後の吹付けコンクリートが鋼製支保工の背面側に通り抜けやすくなり、空隙への吹付けコンクリートの充填性をより確実にすることができる。   Further, according to another steel support according to the present invention, since the hole diameter of the through hole is larger than the maximum aggregate size of the shotcrete, in addition to the above effects, the steel support is constructed. It becomes easy for the shotcrete after being inserted to pass through the back side of the steel support, and the filling property of the shotcrete into the gap can be made more reliable.

また、本発明に係る他の鋼製支保工によれば、前記貫通孔を、所定間隔で複数設けたので、上記の効果に加え、鋼製支保工を建込んだ後の吹付けコンクリートがより効率的に鋼製支保工の背面側に通り抜けやすくなり、空隙への吹付けコンクリートの充填性をより一層確実にすることができる。   In addition, according to another steel support according to the present invention, since the plurality of through holes are provided at a predetermined interval, in addition to the above effects, the shotcrete after the steel support is installed is more It becomes easy to efficiently pass through to the back side of the steel support, and the filling property of the shotcrete into the gap can be further ensured.

以上のように、本発明に係る鋼製支保工は、山岳トンネルの標準工法などにおいて用いられる鋼製支保工に有用であり、特に、吹付けコンクリートとの一体化を図るために用いるのに適している。   As described above, the steel support according to the present invention is useful for steel support used in the standard method of mountain tunnels, and is particularly suitable for use in integration with shotcrete. ing.

5 地山
5a 地山面(または掘削面)
10 鋼製支保工
12 フランジ(H型鋼の地山面に近い側に配置するフランジ)
12a フランジの内側(地山面に対向しない面側)
12b フランジの外側(地山面に対向する面側)
14 フランジ
16 ウェブ
18 貫通孔
20 一次吹付けコンクリート(吹付けコンクリート)
20a 一次吹付けコンクリートの施工面
22 二次吹付けコンクリート(吹付けコンクリート)
S 空隙
5 Natural ground 5a Natural ground surface (or excavation surface)
10 Steel support 12 Flange (Flange placed on the side close to the ground surface of H-shaped steel)
12a Inside of flange (surface side not facing natural ground)
12b Outside of flange (surface side facing ground)
14 Flange 16 Web 18 Through hole 20 Primary shotcrete (sprayed concrete)
20a Construction surface of primary shotcrete 22 Secondary shotcrete (sprayed concrete)
S gap

Claims (3)

トンネルの地山の支保工として、吹付けコンクリートとともに用いられる鋼製支保工であって、
断面H型に形成されたH型鋼からなり、前記H型鋼の地山面に近い側に配置するフランジに貫通孔を設け、前記貫通孔を通じて前記吹付けコンクリートが前記フランジの地山面に対向しない面側から地山面に対向する面側に通り抜け可能にしたことを特徴とする鋼製支保工。
It is a steel support used together with shotcrete as a support for the natural ground of the tunnel,
It consists of H-shaped steel formed in a H-shaped cross section, and a through hole is provided in a flange disposed on the side close to the ground surface of the H-shaped steel, and the shotcrete does not face the ground surface of the flange through the through hole. A steel supporter that can pass from the surface side to the surface side facing the natural ground surface.
前記貫通孔の孔径を、前記吹付けコンクリートの最大骨材寸法よりも大きくしたことを特徴とする請求項1に記載の鋼製支保工。   The steel support according to claim 1, wherein a diameter of the through hole is larger than a maximum aggregate size of the shotcrete. 前記貫通孔を、所定間隔で複数設けたことを特徴とする請求項1または2に記載の鋼製支保工。   The steel support according to claim 1 or 2, wherein a plurality of the through holes are provided at predetermined intervals.
JP2013225662A 2013-10-30 2013-10-30 Steel support Pending JP2015086584A (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092307A1 (en) * 1982-03-24 1983-10-26 Caledonian Mining Company Limited Improvements in and relating to support arches for colliery tunnels
JPS6217300A (en) * 1985-07-13 1987-01-26 株式会社神戸製鋼所 Timbering for reticulate member connection type tunnel
JPH0594398U (en) * 1990-12-06 1993-12-24 株式会社神戸製鋼所 Supporting work for tunnels connected to mesh members
JPH06193052A (en) * 1992-12-24 1994-07-12 Nippon Steel Corp Shape steel for continuous wall
JPH0734100U (en) * 1993-11-25 1995-06-23 東亜建設工業株式会社 Tunnel concrete spraying equipment
JPH09268878A (en) * 1996-03-29 1997-10-14 Kajima Corp Tunnel excavating method
JP2013167069A (en) * 2012-02-14 2013-08-29 Shimizu Corp Steel supporting

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0092307A1 (en) * 1982-03-24 1983-10-26 Caledonian Mining Company Limited Improvements in and relating to support arches for colliery tunnels
JPS6217300A (en) * 1985-07-13 1987-01-26 株式会社神戸製鋼所 Timbering for reticulate member connection type tunnel
JPH0594398U (en) * 1990-12-06 1993-12-24 株式会社神戸製鋼所 Supporting work for tunnels connected to mesh members
JPH06193052A (en) * 1992-12-24 1994-07-12 Nippon Steel Corp Shape steel for continuous wall
JPH0734100U (en) * 1993-11-25 1995-06-23 東亜建設工業株式会社 Tunnel concrete spraying equipment
JPH09268878A (en) * 1996-03-29 1997-10-14 Kajima Corp Tunnel excavating method
JP2013167069A (en) * 2012-02-14 2013-08-29 Shimizu Corp Steel supporting

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