JP7021420B2 - Connection structure and connection method of invert steel support - Google Patents

Connection structure and connection method of invert steel support Download PDF

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JP7021420B2
JP7021420B2 JP2018007313A JP2018007313A JP7021420B2 JP 7021420 B2 JP7021420 B2 JP 7021420B2 JP 2018007313 A JP2018007313 A JP 2018007313A JP 2018007313 A JP2018007313 A JP 2018007313A JP 7021420 B2 JP7021420 B2 JP 7021420B2
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invert
joint plate
steel support
connecting portion
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和彦 水谷
正彦 森
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Maeda Corp
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Description

本発明は、インバート鋼製支保工の連結構造および連結方法に関する。 The present invention relates to a connecting structure and a connecting method of an invert steel support.

トンネルを構築する工法として、ＮＡＴＭ工法(New Austrian Tunneling Method)が知
られている。ＮＡＴＭ工法は、地山が有する支保能力、強度を有効に利用してトンネルの安定を保つという考え方のもとに、吹付けコンクリート、ロックボルト、鋼製支保工を適宜に用いて、地山と一体化したトンネル構造物を建設する工法である。 The NATM method (New Austrian Tunneling Method) is known as a method for constructing a tunnel. The NATM method uses sprayed concrete, rock bolts, and steel support as appropriate based on the idea of effectively utilizing the support capacity and strength of the ground to maintain the stability of the tunnel. It is a construction method to construct an integrated tunnel structure.

ＮＡＴＭ工法においてトンネルを構築する際に、変位が大きい地山の場合に、１次インバートを施工する場合がある。この場合、上半支保工の位置に合わせて、下半支保工、インバート支保工を順次締結することになるが、トンネルの内空を規定通りに確保するためにインバート支保工の必要長さが変化するため、インバート支保工の長さ調整のために用意された長さ調整用支保工をインバート支保工の中間部に取り付ける場合がある。 When constructing a tunnel in the NATM method, a primary invert may be constructed in the case of a ground with a large displacement. In this case, the lower half support and the invert support will be concluded in sequence according to the position of the upper half support, but the required length of the invert support is required to secure the inside of the tunnel as specified. Due to the change, a length adjustment support prepared for adjusting the length of the invert support may be attached to the middle part of the invert support.

特開２００５－１６１６７号公報Japanese Unexamined Patent Publication No. 2005-16167

しかしながら、従来においては、長さ調整用支保工を介した一対のインバート支保工の連結時には、ボルトおよびナットを用いた締結を人手作業によって行う必要があった。 However, in the past, when connecting a pair of invert supports via a length adjusting support, it was necessary to manually fasten them using bolts and nuts.

本発明は、上記のような問題点に鑑みてなされたものであって、その目的は、トンネル底部に設置される一対のインバート鋼製支保工を連結する際に、施工時における安全性や施工性を従来よりも向上させることができる技術を提供することにある。 The present invention has been made in view of the above-mentioned problems, and an object thereof is safety at the time of construction and construction when connecting a pair of invert steel support works installed at the bottom of a tunnel. The purpose is to provide a technique capable of improving the sex.

上記課題を解決するための本発明は、以下の手段を採用した。すなわち、本発明は、トンネルの下半鋼製支保工の両脚部に一端がそれぞれ接合された、トンネル底部に設置される一対のインバート鋼製支保工の連結構造であって、前記一対のインバート鋼製支保工の他端にそれぞれ設けられた第１インバート継手板および第２インバート継手板と、前記一対のインバート鋼製支保工の間に介在すると共に、前記一対のインバート鋼製支保工同士を連結する長さ調整用鋼製支保工と、を備え、前記長さ調整用鋼製支保工は、前記第１インバート継手板と接合される第１連結用継手板と、前記第２インバート継手板と接合される第２連結用継手板と、前記第１インバート継手板および前記第１連結用継手板の一方に凸設された第１雄型連結部と、他方に凹設されると共に当該第１雄型連結部を挿入可能な第１雌型連結部と、前記第２インバート継手板および前記第２連結用継手板の一方に凸設された第２雄型連結部と、他方に凹設されると共に当該第２雄型連結部を挿入可能な第２雌型連結部と、を有し、前記第１雌型連結部が前記第１雄型連結部を係止し、前記第２雌型連結部が前記第２雄型連結部を係止することで、前記一対のインバート鋼製支保工のそれぞれに前記長さ調整用鋼製支保工が連結されることを特徴とする。 The present invention for solving the above problems employs the following means. That is, the present invention is a connecting structure of a pair of invert steel support works installed at the bottom of the tunnel, one ends of which are joined to both legs of the lower half steel support work of the tunnel. The first invert joint plate and the second invert joint plate provided at the other end of the support work are interposed between the pair of invert steel support works, and the pair of invert steel support works are connected to each other. The length adjusting steel support is provided with a first connecting joint plate to be joined to the first invert joint plate and the second invert joint plate. The second connecting joint plate to be joined, the first male type connecting portion projected on one of the first invert joint plate and the first connecting joint plate, and the first male type connecting portion recessed on the other. A first female connecting portion into which a male connecting portion can be inserted, a second male connecting portion projecting on one of the second invert joint plate and the second connecting joint plate, and a recessed portion on the other. It also has a second female-type connecting portion into which the second male-type connecting portion can be inserted, and the first female-type connecting portion locks the first male-type connecting portion, and the second female-type connecting portion is engaged with the second female-type connecting portion. By engaging the second male type connecting portion with the connecting portion, the length adjusting steel support is connected to each of the pair of invert steel support works.

また、本発明において、前記長さ調整用鋼製支保工は、前記第１インバート継手板および前記第２インバート継手板を支持する第１および第２の底板部が、前記第１連結用継手板および前記第２連結用継手板の下縁から連結用支保工の軸方向に沿って延設されており
、前記一対のインバート鋼製支保工に対する前記長さ調整用鋼製支保工の連結時に、前記第１および第２の底板部に前記第１インバート継手板および前記第２インバート継手板が支持された状態で前記長さ調整用鋼製支保工が上方に吊り上げられることで、前記第１雌型連結部および前記第２雌型連結部に対して、前記第１雄型連結部および前記第２雄型連結部がそれぞれガイドされるように構成されていても良い。 Further, in the present invention, in the length adjusting steel support, the first and second bottom plates supporting the first invert joint plate and the second invert joint plate are the first connection joint plates. And, it extends from the lower edge of the second connecting joint plate along the axial direction of the connecting support, and when the length adjusting steel support is connected to the pair of invert steel supports, The length adjusting steel support is lifted upward while the first invert joint plate and the second invert joint plate are supported by the first and second bottom plates, whereby the first female The first male type connecting portion and the second male type connecting portion may be guided to the mold connecting portion and the second female type connecting portion, respectively.

また、本発明は、インバート鋼製支保工の連結方法として特定することができる。すなわち、本発明は、トンネルの下半鋼製支保工の両脚部に一端がそれぞれ接合された、トンネル底部に設置される一対のインバート鋼製支保工同士を連結する連結方法であって、前記一対のインバート鋼製支保工の他端にはそれぞれ第１インバート継手板および第２インバート継手板が設けられており、前記連結方法は、前記第１インバート継手板と接合される第１連結用継手板と、前記第２インバート継手板と接合される第２連結用継手板と、前記第１インバート継手板および前記第１連結用継手板の一方に凸設された第１雄型連結部と他方に凹設されると共に当該第１雄型連結部を挿入可能な第１雌型連結部と、前記第２インバート継手板および前記第２連結用継手板の一方に凸設された第２雄型連結部と他方に凹設されると共に当該第２雄型連結部を挿入可能な第２雌型連結部と、前記第１連結用継手板および前記第２連結用継手板の下縁から前記長さ調整用鋼製支保工の軸方向に沿ってそれぞれ延設されると共に前記第１インバート継手板および前記第２インバート継手板を支持する第１および第２の底板部と、を有する、長さ調整用鋼製支保工をインバート盤上に載置する長さ調整用鋼製支保工設置工程と、前記長さ調整用鋼製支保工の前記第１の底板部および第２の底板部にそれぞれ前記第１インバート継手板および前記第２インバート継手板を載置するインバート継手板載置工程と、前記長さ調整用鋼製支保工を上方に吊り上げることで、前記第１雌型連結部によって前記第１雄型連結部を係止すると共に前記第２雌型連結部によって前記第２雄型連結部を係止することで、前記一対のインバート鋼製支保工のそれぞれに前記長さ調整用鋼製支保工を連結する吊り上げ連結工程と、を含むことを特徴とする。ここで、前記吊り上げ連結工程において、前記長さ調整用鋼製支保工を重機によって上方に吊り上げても良い。 Further, the present invention can be specified as a method for connecting invert steel support works. That is, the present invention is a connecting method for connecting a pair of invert steel support works installed at the bottom of a tunnel, one ends of which are joined to both legs of the lower half steel support work of the tunnel. A first invert joint plate and a second invert joint plate are provided at the other ends of the invert steel support, respectively, and the connection method is a first connection joint plate to be joined to the first invert joint plate. To the second connecting joint plate to be joined to the second invert joint plate, the first male type connecting portion projected on one of the first invert joint plate and the first connecting joint plate, and the other. A first female connecting portion that is recessed and into which the first male connecting portion can be inserted, and a second male connecting portion that is convexly provided on one of the second invert joint plate and the second connecting joint plate. The length from the lower edge of the first connecting joint plate and the second connecting joint plate to the second female connecting portion that is recessed in the portion and the other and into which the second male connecting portion can be inserted. Length adjustment having first and second bottom plate portions extending along the axial direction of the adjusting steel support and supporting the first invert joint plate and the second invert joint plate, respectively. The length adjusting steel support installation process in which the steel support is placed on the invert board, and the first bottom plate portion and the second bottom plate portion of the length adjusting steel support are described above, respectively. By the invert joint plate mounting step of mounting the first invert joint plate and the second invert joint plate, and by lifting the length adjusting steel supporter upward, the first female mold connecting portion is used to make the first. By locking the 1 male type connecting portion and locking the 2nd male type connecting portion by the 2nd female type connecting portion, the length adjusting steel is used for each of the pair of invert steel support works. It is characterized by including a lifting connection process for connecting support works. Here, in the lifting connection step, the length adjusting steel support may be lifted upward by a heavy machine.

また、本発明に係るインバート鋼製支保工の連結方法は、前記インバート継手板載置工程において、前記第１インバート継手板と前記第１連結用継手板が対向しつつ互いに離反し、前記第２インバート継手板と前記第２連結用継手板が対向しつつ互いに離反した状態で配置されるように、前記第１の底板部および第２の底板部にそれぞれ前記第１インバート継手板および前記第２インバート継手板を載置し、前記吊り上げ連結工程において前記長さ調整用鋼製支保工が上方に吊り上げられることで、前記第１の底板部上を前記第１インバート継手板が摺動すると共に前記第２の底板部上を前記第２インバート継手板が摺動する結果、前記第１インバート継手板と前記第１連結用継手板が接近すると共に前記第２インバート継手板と前記第２連結用継手板が接近し、前記第１雌型連結部および前記第２雌型連結部に対して前記第１雄型連結部および前記第２雄型連結部がそれぞれガイドされても良い。 Further, in the method of connecting the invert steel support according to the present invention, in the invert joint plate mounting step, the first invert joint plate and the first connection joint plate are separated from each other while facing each other, and the second The first invert joint plate and the second invert joint plate are placed on the first bottom plate portion and the second bottom plate portion, respectively, so that the invert joint plate and the second connection joint plate are arranged so as to face each other and are separated from each other. The first invert joint plate slides on the first bottom plate portion and the first invert joint plate slides on the first bottom plate portion by mounting the invert joint plate and lifting the length adjusting steel support in the lifting connection step. As a result of the second invert joint plate sliding on the second bottom plate portion, the first invert joint plate and the first connection joint plate come close to each other, and the second invert joint plate and the second connection joint. The plates may approach each other and guide the first male-type connecting portion and the second male-type connecting portion to the first female-type connecting portion and the second female-type connecting portion, respectively.

本発明によれば、一対のインバート鋼製支保工を連結する際に、施工時における安全性や施工性を従来よりも向上させることができる技術を提供できる。 According to the present invention, it is possible to provide a technique capable of improving safety and workability at the time of construction when connecting a pair of invert steel supports.

図１は、実施形態１に係るトンネルの掘進方向を横から見たトンネル断面の概略図である。FIG. 1 is a schematic view of a tunnel cross section when the tunnel excavation direction according to the first embodiment is viewed from the side. 図２は、図１におけるＡの方向から切羽の周辺を見た図である。FIG. 2 is a view of the periphery of the face from the direction of A in FIG. 図３は、実施形態１に係るトンネルの鋼製支保構造を示す図である。FIG. 3 is a diagram showing a steel support structure of the tunnel according to the first embodiment. 図４は、図３における破線円Ｂで囲まれた左側下半鋼製支保工の脚部近傍の拡大図である。FIG. 4 is an enlarged view of the vicinity of the leg portion of the left lower semi-steel support work surrounded by the broken line circle B in FIG. 図５は、図３における破線円Ｃで囲まれた右側下半鋼製支保工の脚部近傍の拡大図である。FIG. 5 is an enlarged view of the vicinity of the leg portion of the right lower semi-steel support work surrounded by the broken line circle C in FIG. 図６は、図３における破線円Ｄで囲まれた部分の拡大図である。FIG. 6 is an enlarged view of the portion surrounded by the broken line circle D in FIG. 図７Ａは、実施形態１に係る第１インバート継手板および第２インバート継手板の正面図である。FIG. 7A is a front view of the first invert joint plate and the second invert joint plate according to the first embodiment. 図７Ｂは、実施形態１に係る第１インバート継手板および第２インバート継手板の背面図である。FIG. 7B is a rear view of the first invert joint plate and the second invert joint plate according to the first embodiment. 図８Ａは、実施形態１に係る長さ調整用鋼製支保工における第１連結用継手板および第２連結用継手板の正面図である。FIG. 8A is a front view of the first connecting joint plate and the second connecting joint plate in the length adjusting steel support according to the first embodiment. 図８Ｂは、実施形態１に係る長さ調整用鋼製支保工における第１連結用継手板および第２連結用継手板の背面図である。FIG. 8B is a rear view of the first connecting joint plate and the second connecting joint plate in the length adjusting steel support according to the first embodiment. 図９は、実施形態１に係る雌型連結部および雄型連結部の概略構造を示す図である。FIG. 9 is a diagram showing a schematic structure of a female type connecting portion and a male type connecting portion according to the first embodiment. 図１０は、図９におけるＸ－Ｘ矢視断面図である。FIG. 10 is a cross-sectional view taken along the line XX in FIG. 図１１は、実施形態１に係る左側インバート鋼製支保工および右側インバート鋼製支保工を長さ調整用鋼製支保工に連結する手順を説明する図である。FIG. 11 is a diagram illustrating a procedure for connecting the left invert steel support and the right invert steel support according to the first embodiment to the length adjusting steel support. 図１２は、実施形態１に係る雌型連結部と雄型連結部を連結した状態を示す図である。FIG. 12 is a diagram showing a state in which the female type connecting portion and the male type connecting portion according to the first embodiment are connected. 図１３は、実施形態１の変形例に係る連結構造を説明する図である。FIG. 13 is a diagram illustrating a connection structure according to a modified example of the first embodiment.

以下、本発明の実施形態について、図面を参照しながら説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

＜実施形態１＞
図１は、実施形態１に係るトンネルＴの施工状況を示す図である。図１は、実施形態１に係るトンネルＴの掘進方向を横から見たトンネル断面の概略図である。図１に示すトンネル掘削においては、例示的にトンネル断面を上半部と下半部に分割して掘削を行う補助ベンチ付き全断面工法を採用しており、切羽１００の手前下方にベンチ部２００が形成されている。また、図１中における符号Ａは、トンネルＴの掘進方向を示している。図２は、図１におけるＡの方向から切羽１００の周辺を見た図である。図２中の斜線で示す部分は垂直面を示している。 <Embodiment 1>
FIG. 1 is a diagram showing a construction status of the tunnel T according to the first embodiment. FIG. 1 is a schematic view of a tunnel cross section when the excavation direction of the tunnel T according to the first embodiment is viewed from the side. In the tunnel excavation shown in FIG. 1, an all-section method with an auxiliary bench is used to exemplify the excavation by dividing the tunnel cross section into an upper half and a lower half, and the bench portion 200 is located below the front of the face 100. Is formed. Further, reference numeral A in FIG. 1 indicates the excavation direction of the tunnel T. FIG. 2 is a view of the periphery of the face 100 from the direction of A in FIG. The shaded area in FIG. 2 indicates a vertical plane.

符号１１０は、切羽１００の上半鏡である。上半鏡１１０には、地山の変位が増大して崩壊することを抑制するために、鏡ボルト１２０や鏡吹付けコンクリート１３０が必要に応じて施工されている。また、符号１４０は、ロックボルトである。 Reference numeral 110 is an upper mirror of the face 100. A mirror bolt 120 and a mirror sprayed concrete 130 are installed on the upper half mirror 110 as needed in order to prevent the ground from being displaced due to an increase and collapsing. Further, reference numeral 140 is a lock bolt.

ベンチ部２００は、上半鏡１１０の下端からトンネル軸方向手前側に連なる水平面である上半盤２１０と、この上半盤２１０の手前端から鉛直下方に連なる垂直面である下半鏡２２０とからなる段部である。なお、ここでいう「手前」とは、トンネル軸方向において、トンネルＴの掘進方向とは逆側を指す。上半盤２１０は、一例として、掘進方向に２～４ｍ程度の長さに設定されている。また、下半鏡２２０の下端からは、トンネル軸方向手前側に下半盤２３０が連なっている。下半盤２３０は、一例として例えば１～２ｍ程度の水平面である。 The bench portion 200 includes an upper half plate 210 which is a horizontal plane extending from the lower end of the upper half mirror 110 to the front side in the tunnel axial direction, and a lower half mirror 220 which is a vertical plane extending vertically downward from the front end of the upper half plate 210. It is a stepped part consisting of. The term "front" as used herein refers to the side opposite to the excavation direction of the tunnel T in the direction of the tunnel axis. The upper half 210 is set to a length of about 2 to 4 m in the excavation direction as an example. Further, from the lower end of the lower half mirror 220, the lower half board 230 is connected to the front side in the tunnel axial direction. The lower half 230 is, for example, a horizontal plane of about 1 to 2 m.

また、下半盤２３０の手前端から下方にバックホウ５００などの重機によって掘削されることで、インバート施工部７００が設けられる。下半盤２３０の手前端からはインバート鏡７１０が鉛直下方に連なっており、インバート鏡７１０の下端からは、インバート盤７２０が連続して設けられている。インバート施工部７００の掘削が完了すると、インバート盤７２０に後述するインバート鋼製支保工３０（図３を参照）を配置して、このイン
バート鋼製支保工を既に設置済みの下半鋼製支保工（不図示）と連結し、インバート吹付けコンクリート（不図示）を施すことで、断面閉合が行われる。このようなインバート施工が行われたインバート施工完了部は、トンネル断面全周にわたる補強がなされることとなり、力学的安定性が確保される。なお、インバート鋼製支保工の設置およびインバート吹付けコンクリートの施工が完了したインバート施工部７００は、埋め戻し土によって埋め戻される。 Further, the invert construction unit 700 is provided by excavating from the front end of the lower half plate 230 downward by a heavy machine such as a backhoe 500. The invert mirror 710 is connected vertically downward from the front end of the lower half plate 230, and the invert plate 720 is continuously provided from the lower end of the invert mirror 710. When the excavation of the invert construction section 700 is completed, the invert steel support 30 (see FIG. 3) described later is placed on the invert board 720, and this invert steel support is already installed in the lower half steel support. Cross-section closure is performed by connecting with (not shown) and applying invert sprayed concrete (not shown). The invert construction completed portion where such invert construction is performed is reinforced over the entire circumference of the tunnel cross section, and mechanical stability is ensured. The invert construction section 700, in which the installation of the invert steel support and the construction of the invert spray concrete have been completed, is backfilled with backfill soil.

図３は、実施形態１に係るトンネルＴの鋼製支保構造１を示す図である。符号１０は上半鋼製支保工、符号２０Ｌは左側下半鋼製支保工、符号２０Ｒは右側下半鋼製支保工である。また、符号３０はインバート鋼製支保工、符号６０は長さ調整用鋼製支保工である。上半鋼製支保工１０は、一対の円弧状の左側上半鋼製支保工１０Ｌおよび右側上半鋼製支保工１０Ｒの天端部（上端部）同士を一体に連結することでアーチ状に形成されている。インバート鋼製支保工３０は、左側下半鋼製支保工２０Ｌの脚部に接合される左側インバート鋼製支保工３０Ｌと、右側下半鋼製支保工２０Ｒの脚部に接合される右側インバート鋼製支保工３０Ｒを含んでいる。インバート鋼製支保工３０（左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒ）は、トンネル底部のインバート施工部７００におけるインバート盤７２０に設置される鋼製支保工であり、長さ調整用鋼製支保工６０を介して互いに連結される。 FIG. 3 is a diagram showing a steel support structure 1 of the tunnel T according to the first embodiment. Reference numeral 10 is an upper half steel support, reference numeral 20L is a left lower half steel support, and reference numeral 20R is a right lower half steel support. Reference numeral 30 is an invert steel support, and reference numeral 60 is a length adjusting steel support. The upper semi-steel support 10 has an arch shape by integrally connecting the top ends (upper ends) of the pair of arc-shaped left upper semi-steel support 10L and the right upper semi-steel support 10R. It is formed. The invert steel support 30 is the right invert steel joined to the left invert steel support 30L joined to the leg of the left lower half steel support 20L and the right invert steel support 20R joined to the right lower half steel support 20R. Includes support work 30R. The invert steel support 30 (left side invert steel support 30L and right side invert steel support 30R) is a steel support installed on the invert board 720 in the invert construction section 700 at the bottom of the tunnel, and the length is adjusted. They are connected to each other via a steel support 60.

左側上半鋼製支保工１０Ｌの下端部には四角形の鋼製平板である下端接合板１１Ｌが設けられている。左側下半鋼製支保工２０Ｌの上端部に設けられている四角形の鋼製平板である上端接合板２２Ｌに下端接合板１１Ｌがボルト接合されることで、左側上半鋼製支保工１０Ｌおよび左側下半鋼製支保工２０Ｌが一体に接合されている。同様に、右側上半鋼製支保工１０Ｒの下端部には四角形の鋼製平板である下端接合板１１Ｒが設けられており、右側下半鋼製支保工２０Ｒの上端部に設けられている四角形の鋼製平板である上端接合板２２Ｒに下端接合板１１Ｒがボルト接合されることで、右側上半鋼製支保工１０Ｒおよび右側下半鋼製支保工２０Ｒが一体に接合されている。 A lower end joining plate 11L, which is a quadrangular steel flat plate, is provided at the lower end of the left upper semi-steel support 10L. By bolting the lower end joint plate 11L to the upper end joint plate 22L, which is a square steel flat plate provided at the upper end of the left lower half steel support 20L, the left upper half steel support 10L and the left side The lower semi-steel support 20L is integrally joined. Similarly, a lower end joining plate 11R, which is a square steel flat plate, is provided at the lower end of the right upper half steel support 10R, and a square provided at the upper end of the right lower half steel support 20R. By bolting the lower end joint plate 11R to the upper end joint plate 22R, which is a steel flat plate, the right upper half steel support 10R and the right lower half steel support 20R are integrally joined.

図４は、図３における破線円Ｂで囲まれた左側下半鋼製支保工２０Ｌの脚部近傍の拡大図である。図５は、図３における破線円Ｃで囲まれた右側下半鋼製支保工２０Ｒの脚部近傍の拡大図である。図４および図５に示すように、左側下半鋼製支保工２０Ｌおよび右側下半鋼製支保工２０Ｒの両脚部の下端小口には、左側下半鋼製支保工２０Ｌおよび右側下半鋼製支保工２０Ｒを支持するための底板２３Ｌ，２３Ｒがそれぞれ設けられている。更に、左側下半鋼製支保工２０Ｌの脚部には、左側インバート鋼製支保工３０Ｌと連結される左側下半継手部２４Ｌが設けられ、右側下半鋼製支保工２０Ｒの脚部には、右側インバート鋼製支保工３０Ｒと連結される右側下半継手部２４Ｒが設けられている。 FIG. 4 is an enlarged view of the vicinity of the leg portion of the left lower semi-steel support 20L surrounded by the broken line circle B in FIG. FIG. 5 is an enlarged view of the vicinity of the leg portion of the right lower semi-steel support 20R surrounded by the broken line circle C in FIG. As shown in FIGS. 4 and 5, the lower left half-steel support 20L and the right lower half-steel support 20L and the right lower half-steel support 20L are located at the lower end edges of both legs of the left lower half-steel support 20L and the right lower half-steel support 20R. Bottom plates 23L and 23R for supporting the support work 20R are provided, respectively. Further, the leg of the left lower half steel support 20L is provided with a left lower half joint portion 24L connected to the left invert steel support 30L, and the leg of the right lower half steel support 20R is provided. , The right lower half joint portion 24R connected to the right side invert steel support 30R is provided.

図４に示すように、左側下半鋼製支保工２０Ｌにおける左側下半継手部２４Ｌには、左側下半継手板２４０Ｌが設けられている。また、図５に示すように、右側下半鋼製支保工２０Ｒにおける右側下半継手部２４Ｒには、右側下半継手板２４０Ｒが設けられている。 As shown in FIG. 4, a left lower half joint plate 240L is provided on the left lower half joint portion 24L in the left lower half steel support work 20L. Further, as shown in FIG. 5, the right lower half joint plate 240R is provided on the right lower half joint portion 24R in the right lower half steel support 20R.

次に、左右一対の左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒおよび長さ調整用鋼製支保工６０の詳細について説明する。図６は、図３における破線円Ｄで囲まれた部分の拡大図であり、インバート鋼製支保工３０および長さ調整用鋼製支保工６０の接合部およびその近傍を示している。 Next, the details of the pair of left and right invert steel support 30L, the right invert steel support 30R, and the length adjusting steel support 60 will be described. FIG. 6 is an enlarged view of the portion surrounded by the broken line circle D in FIG. 3, showing the joint portion of the invert steel support 30 and the length adjusting steel support 60 and their vicinity thereof.

図４および図６に示すように、左側インバート鋼製支保工３０Ｌは、支保工本体３００Ｌと、支保工本体３００Ｌの一端に接合された四角形の鋼製平板である第１インバート接合板３１Ｌと、支保工本体３００Ｌの他端に接合された四角形の鋼製平板である第１インバート継手板３２Ｌを有する。また、図５および図６に示すように、右側インバート鋼製
支保工３０Ｒは、支保工本体３００Ｒと、支保工本体３００Ｒの一端に接合された四角形の鋼製平板である第２インバート接合板３１Ｒと、支保工本体３００Ｒの他端に接合された四角形の鋼製平板である第２インバート継手板３２Ｒを有する。また、支保工本体３００Ｌ，３００Ｒは、ウェブ３００ａ、当該ウェブ３００ａに直交する一対の上フランジ３００ｂおよび上フランジ３００ｃから構成されるＨ形鋼である。トンネルＴの鋼製支保構造１において、左側下半鋼製支保工２０Ｌにおける左側下半継手部２４Ｌの左側下半継手板２４０Ｌと、左側インバート鋼製支保工３０Ｌの第１インバート接合板３１Ｌがボルト接合されることで、これらが一体に接合されている。同様に、右側下半鋼製支保工２０Ｒにおける右側下半継手部２４Ｒの右側下半継手板２４０Ｒと、右側インバート鋼製支保工３０Ｒの第２インバート接合板３１Ｒがボルト接合されることで、これらが一体に接合されている。また、左右一対の左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒは、図６に示すように、長さ調整用の鋼製支保工である長さ調整用鋼製支保工６０を介して連結されている。 As shown in FIGS. 4 and 6, the left invert steel support 30L includes a support main body 300L and a first invert joint plate 31L which is a quadrangular steel flat plate joined to one end of the support main body 300L. It has a first invert joint plate 32L, which is a square steel flat plate joined to the other end of the support main body 300L. Further, as shown in FIGS. 5 and 6, the right invert steel support 30R is a second invert joint plate 31R which is a square steel flat plate joined to one end of the support main body 300R and the support main body 300R. And a second invert joint plate 32R, which is a quadrangular steel flat plate joined to the other end of the support main body 300R. Further, the support main bodies 300L and 300R are H-shaped steel composed of a web 300a, a pair of upper flanges 300b orthogonal to the web 300a, and an upper flange 300c. In the steel support structure 1 of the tunnel T, the left lower half joint plate 240L of the left lower half joint portion 24L in the left lower half steel support 20L and the first invert joint plate 31L of the left invert steel support 30L are bolts. By being joined, these are joined together. Similarly, the right lower half joint plate 240R of the right lower half joint portion 24R in the right lower half steel support 20R and the second invert joint plate 31R of the right invert steel support 30R are bolted together. Are joined together. Further, as shown in FIG. 6, the pair of left and right invert steel support 30L and the right invert steel support 30R have a length adjustment steel support 60 which is a length adjustment steel support 60. It is connected via.

長さ調整用鋼製支保工６０は、支保工本体６００と、第１底板部６１０、第２底板部６２０を有している。支保工本体６００は、ウェブ６００ａ、当該ウェブ６００ａに直交する一対の上フランジ６００ｂおよび下フランジ６００ｃから構成されるＨ形鋼である。支保工本体６００の両端には、第１連結用継手板６４０Ｌおよび第２連結用継手板６４０Ｒが溶接されている。上フランジ６００ｂには、バックホウ５００などの重機によって長さ調整用鋼製支保工６０を吊り上げるために用いる被吊上げ部６６０が設けられている。本実施形態において、被吊上げ部６６０は、吊ワイヤの先端に設けられる吊り具を装着するための吊り穴（図示せず）形成されていても良い。 The length adjusting steel support 60 has a support main body 600, a first bottom plate portion 610, and a second bottom plate portion 620. The support main body 600 is an H-shaped steel composed of a web 600a, a pair of upper flanges 600b orthogonal to the web 600a, and a lower flange 600c. A first connecting joint plate 640L and a second connecting joint plate 640R are welded to both ends of the support main body 600. The upper flange 600b is provided with a lifted portion 660 used for lifting the length adjusting steel support 60 by a heavy machine such as a backhoe 500. In the present embodiment, the lifted portion 660 may be formed with a hanging hole (not shown) for mounting a hanging tool provided at the tip of the hanging wire.

長さ調整用鋼製支保工６０の第１底板部６１０は、支保工本体６００の一端に設けられた第１連結用継手板６４０Ｌの下縁から、支保工本体６００における下フランジ６００ｃの延伸方向に沿って延設されている。長さ調整用鋼製支保工６０の第２底板部６２０は、支保工本体６００における第２連結用継手板６４０Ｒの下縁から、支保工本体６００における下フランジ６００ｃの延伸方向に沿って延設されている。 The first bottom plate portion 610 of the length adjusting steel support 60 is from the lower edge of the first connecting joint plate 640L provided at one end of the support body 600 in the extending direction of the lower flange 600c in the support body 600. It is extended along. The second bottom plate portion 620 of the steel support 60 for length adjustment extends from the lower edge of the second connecting joint plate 640R in the support body 600 along the extending direction of the lower flange 600c in the support body 600. Has been done.

長さ調整用鋼製支保工６０における第１底板部６１０は、左側インバート鋼製支保工３０Ｌに長さ調整用鋼製支保工６０を連結する際に、左側インバート鋼製支保工３０Ｌの他端に設けられている第１インバート継手板３２Ｌの下縁を載置することで、第１インバート継手板３２Ｌを支持するため支持プレートである。長さ調整用鋼製支保工６０における第１底板部６１０には、左側インバート鋼製支保工３０Ｌの第１インバート継手板３２Ｌを載置した際に、第１インバート継手板３２Ｌが第１底板部６１０の横幅方向にずれることを抑制するためのストッパー部材６１１ａ，６１１ｂが、第１底板部６１０の一対の側縁からそれぞれ上方に向かって延設されている。 The first bottom plate portion 610 of the length adjusting steel support 60 is the other end of the left invert steel support 30L when the length adjusting steel support 60 is connected to the left invert steel support 30L. It is a support plate for supporting the first invert joint plate 32L by placing the lower edge of the first invert joint plate 32L provided in the above. When the first invert joint plate 32L of the left invert steel support 30L is placed on the first bottom plate portion 610 of the length adjusting steel support 60, the first invert joint plate 32L is the first bottom plate portion. Stopper members 611a and 611b for suppressing the deviation of the 610 in the lateral width direction are extended upward from the pair of side edges of the first bottom plate portion 610, respectively.

また、長さ調整用鋼製支保工６０における第２底板部６２０は、右側インバート鋼製支保工３０Ｒに長さ調整用鋼製支保工６０を連結する際に、右側インバート鋼製支保工３０Ｒの他端に設けられている第２インバート継手板３２Ｒを載置することで、これを支持するため支持プレートである。長さ調整用鋼製支保工６０における第２底板部６２０には、右側インバート鋼製支保工３０Ｒの第２インバート継手板３２Ｒを載置した際に、第２インバート継手板３２Ｒが第２底板部６２０の横幅方向にずれることを抑制するためのストッパー部材６２１ａ，６２１ｂが、第２底板部６２０の一対の側縁からそれぞれ上方に向かって延設されている。 Further, the second bottom plate portion 620 of the length adjusting steel support 60 is the right invert steel support 30R when the length adjusting steel support 60 is connected to the right invert steel support 30R. It is a support plate for supporting the second invert joint plate 32R provided at the other end by mounting the second invert joint plate 32R. When the second invert joint plate 32R of the right invert steel support 30R is placed on the second bottom plate portion 620 of the length adjusting steel support 60, the second invert joint plate 32R is the second bottom plate portion. Stopper members 621a and 621b for suppressing the deviation of the 620 in the lateral width direction are extended upward from the pair of side edges of the second bottom plate portion 620, respectively.

図７Ａは、実施形態１に係る第１インバート継手板３２Ｌおよび第２インバート継手板３２Ｒの正面図である。図７Ｂは、実施形態１に係る第１インバート継手板３２Ｌおよび第２インバート継手板３２Ｒの背面図である。本実施形態における第１インバート継手板
３２Ｌおよび第２インバート継手板３２Ｒは、同一構造である。ここで、符号３２０ａは、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の外面（表面）、符号３２０ｂは、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の内面（裏面）である。符号３２０ｃは第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の上縁、符号３２０ｄは第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の下縁、符号３２０ｅは第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の左側縁、符号３２０ｆは第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の右側縁である。 FIG. 7A is a front view of the first invert joint plate 32L and the second invert joint plate 32R according to the first embodiment. FIG. 7B is a rear view of the first invert joint plate 32L and the second invert joint plate 32R according to the first embodiment. The first invert joint plate 32L and the second invert joint plate 32R in the present embodiment have the same structure. Here, reference numeral 320a is the outer surface (front surface) of the first invert joint plate 32L (second invert joint plate 32R), and reference numeral 320b is the inner surface (back surface) of the first invert joint plate 32L (second invert joint plate 32R). Is. Reference numeral 320c is the upper edge of the first invert joint plate 32L (second invert joint plate 32R), reference numeral 320d is the lower edge of the first invert joint plate 32L (second invert joint plate 32R), and reference numeral 320e is the first invert joint plate. The left edge of 32L (second invert joint plate 32R), reference numeral 320f, is the right edge of the first invert joint plate 32L (second invert joint plate 32R).

図７Ｂにおいて、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）に接続される支保工本体３００Ｌ（３００Ｒ）の端部形状を破線で示す。また、図７Ａおよび図７Ｂに、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の上下方向（高さ方向）および横幅方向を図示する。第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の上下方向は、左側縁３２０ｅおよび右側縁３２０ｆの延伸方向と平行である。また、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の横幅方向は上縁３２０ｃおよび下縁３２０ｄの延伸方向と平行である。また、図７Ａおよび図７Ｂに示すように、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）には、一対の雄型連結部５０が第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の横幅方向に並んで設けられている。雄型連結部５０は、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の外面３２０ａに凸設されており、外面３２０ａに対して垂直に突出している（図９を参照）。 In FIG. 7B, the end shape of the support main body 300L (300R) connected to the first invert joint plate 32L (second invert joint plate 32R) is shown by a broken line. Further, FIGS. 7A and 7B show the vertical direction (height direction) and the horizontal width direction of the first invert joint plate 32L (second invert joint plate 32R). The vertical direction of the first invert joint plate 32L (second invert joint plate 32R) is parallel to the extension direction of the left side edge 320e and the right side edge 320f. Further, the lateral width direction of the first invert joint plate 32L (second invert joint plate 32R) is parallel to the extension direction of the upper edge 320c and the lower edge 320d. Further, as shown in FIGS. 7A and 7B, the first invert joint plate 32L (second invert joint plate 32R) has a pair of male connecting portions 50 on the first invert joint plate 32L (second invert joint plate 32R). ) Are provided side by side in the width direction. The male connecting portion 50 is projected on the outer surface 320a of the first invert joint plate 32L (second invert joint plate 32R) and projects perpendicularly to the outer surface 320a (see FIG. 9).

図８Ａは、実施形態１に係る長さ調整用鋼製支保工６０における第１連結用継手板６４０Ｌおよび第２連結用継手板６４０Ｒの正面図である。図８Ｂは、実施形態１に係る長さ調整用鋼製支保工６０における第１連結用継手板６４０Ｌおよび第２連結用継手板６４０Ｒの背面図である。本実施形態における第１連結用継手板６４０Ｌおよび第２連結用継手板６４０Ｒは、同一構造である。ここで、符号６４０ａは、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の外面（表面）、符号６４０ｂは、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の内面（裏面）である。符号６４０ｃは第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の上縁、符号６４０ｄは第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の下縁、符号６４０ｅは第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の左側縁、符号６４０ｆは第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の右側縁である。 FIG. 8A is a front view of the first connecting joint plate 640L and the second connecting joint plate 640R in the length adjusting steel support 60 according to the first embodiment. FIG. 8B is a rear view of the first connecting joint plate 640L and the second connecting joint plate 640R in the length adjusting steel support 60 according to the first embodiment. The first connecting joint plate 640L and the second connecting joint plate 640R in the present embodiment have the same structure. Here, reference numeral 640a is the outer surface (surface) of the first connection joint plate 640L (second connection joint plate 640R), and reference numeral 640b is the first connection joint plate 640L (second connection joint plate 640R). The inner surface (back surface). Reference numeral 640c is the upper edge of the first connecting joint plate 640L (second connecting joint plate 640R), reference numeral 640d is the lower edge of the first connecting joint plate 640L (second connecting joint plate 640R), and reference numeral 640e is the first. 1 The left edge of the connecting joint plate 640L (second connecting joint plate 640R), reference numeral 640f is the right edge of the first connecting joint plate 640L (second connecting joint plate 640R).

図８Ｂにおいて、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に接続される支保工本体６００の端部形状を破線で示す。また、図６Ａおよび図６Ｂに、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の上下方向（高さ方向）および横幅方向を図示する。第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の上下方向は、左側縁６４０ｅおよび右側縁６４０ｆの延伸方向と平行である。また、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の横幅方向は上縁６４０ｃおよび下縁６４０ｄの延伸方向と平行である。 In FIG. 8B, the end shape of the support main body 600 connected to the first connecting joint plate 640L (second connecting joint plate 640R) is shown by a broken line. Further, FIGS. 6A and 6B show the vertical direction (height direction) and the horizontal width direction of the first connecting joint plate 640L (second connecting joint plate 640R). The vertical direction of the first connecting joint plate 640L (second connecting joint plate 640R) is parallel to the extending direction of the left side edge 640e and the right side edge 640f. Further, the lateral width direction of the first connecting joint plate 640L (second connecting joint plate 640R) is parallel to the stretching direction of the upper edge 640c and the lower edge 640d.

第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）には、一対の雌型連結部４０が第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の横幅方向に並んで設けられている。雌型連結部４０は、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に対して凹設されている（図９を参照）。 The first connecting joint plate 640L (second connecting joint plate 640R) is provided with a pair of female connecting portions 40 arranged side by side in the lateral width direction of the first connecting joint plate 640L (second connecting joint plate 640R). Has been done. The female connecting portion 40 is recessed with respect to the first connecting joint plate 640L (second connecting joint plate 640R) (see FIG. 9).

本実施形態においては、左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒに長さ調整用鋼製支保工６０を連結する際に、第１インバート継手板３２Ｌおよび第２インバート継手板３２Ｒに凸設された一対の雄型連結部５０と、長さ調整用鋼製
支保工６０の第１連結用継手板６４０Ｌおよび第２連結用継手板６４０Ｒに凹設された一対の雌型連結部４０がワンタッチで連結される。その結果、第１インバート継手板３２Ｌと第１連結用継手板６４０Ｌ、第２インバート継手板３２Ｒと第２連結用継手板６４０Ｒがそれぞれ面接触した状態で、長さ調整用鋼製支保工６０が左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒに対して接合される（図６を参照）。 In the present embodiment, when the length adjusting steel support 60 is connected to the left invert steel support 30L and the right invert steel support 30R, the first invert joint plate 32L and the second invert joint plate 32R are used. A pair of male connecting portions 50 convex to the surface, and a pair of female connecting portions recessed in the first connecting joint plate 640L and the second connecting joint plate 640R of the length adjusting steel support 60. 40 are connected with one touch. As a result, the length adjusting steel support work 60 is in a state where the first invert joint plate 32L and the first connection joint plate 640L and the second invert joint plate 32R and the second connection joint plate 640R are in surface contact with each other. It is joined to the left side invert steel support 30L and the right side invert steel support 30R (see FIG. 6).

図９は、実施形態１に係る雌型連結部４０および雄型連結部５０の概略構造を示す図である。図９は、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）と、第１連結用継手板６４０Ｌ（第２インバート継手板３２Ｒと第２連結用継手板６４０Ｒ）が連結される直前の状態で互いに離間している状態を示している。 FIG. 9 is a diagram showing a schematic structure of the female connecting portion 40 and the male connecting portion 50 according to the first embodiment. FIG. 9 shows a state immediately before the first invert joint plate 32L (second invert joint plate 32R) and the first connection joint plate 640L (second invert joint plate 32R and second connection joint plate 640R) are connected. Shows the state of being separated from each other.

まず、第１インバート継手板３２Ｌおよび第２インバート継手板３２Ｒに凸設された雄型連結部５０について説明する。第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）には、一対の雄型連結部５０が設けられる位置にそれぞれ開口孔３２１が穿設されている。また、雄型連結部５０は、棒状の雄型係止部材５１を有している。雄型係止部材５１は、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の開口孔３２１よりも若干小径の軸部材であり、その基端部に雄ネジ５１ａが刻設されている。また、雄型係止部材５１の中間部には環状の鍔部５１ｂが設けられている。また、雄型係止部材５１の鍔部５１ｂよりも先端側の部位における外周部には、雄ネジ５１ｃが形成されている。雄型係止部材５１の雄ネジ５１ｃは、雄型係止部材５１の外周に複数並設された周方向の雄側係止溝である。また、雄型係止部材５１の先端部５１ｄには、先端に向かって縮径するテーパ面５１ｅが形成されている。 First, the male connecting portion 50 projected on the first invert joint plate 32L and the second invert joint plate 32R will be described. The first invert joint plate 32L (second invert joint plate 32R) is provided with opening holes 321 at positions where a pair of male connecting portions 50 are provided. Further, the male connecting portion 50 has a rod-shaped male locking member 51. The male locking member 51 is a shaft member having a diameter slightly smaller than the opening hole 321 of the first invert joint plate 32L (second invert joint plate 32R), and a male screw 51a is engraved at the base end portion thereof. .. Further, an annular flange portion 51b is provided in the middle portion of the male locking member 51. Further, a male screw 51c is formed on the outer peripheral portion of the male type locking member 51 at a portion on the tip end side of the flange portion 51b. The male screw 51c of the male locking member 51 is a plurality of male-side locking grooves in the circumferential direction arranged side by side on the outer periphery of the male locking member 51. Further, the tip portion 51d of the male locking member 51 is formed with a tapered surface 51e whose diameter is reduced toward the tip.

また、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の外面３２０ａ側における開口孔３２１の周囲には、周囲よりも一段凹んだザグリ部３２２が形成されている。雄型係止部材５１の鍔部５１ｂは、開口孔３２１の径よりも大きい。雄型係止部材５１の基端側を、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の外面３２０ａ側から開口孔３２１に挿通し、鍔部５１ｂをザグリ部３２２に配置した状態で基端部の雄ネジ５１ａにナット５２を螺着する。その結果、雄型係止部材５１が第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の外面３２０ａから突出した状態で、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）に雄型係止部材５１を固定することができる。 Further, a counterbore portion 322 which is one step recessed from the periphery is formed around the opening hole 321 on the outer surface 320a side of the first invert joint plate 32L (second invert joint plate 32R). The flange portion 51b of the male locking member 51 is larger than the diameter of the opening hole 321. The base end side of the male locking member 51 is inserted into the opening hole 321 from the outer surface 320a side of the first invert joint plate 32L (second invert joint plate 32R), and the flange portion 51b is arranged in the counterbore portion 322. The nut 52 is screwed onto the male screw 51a at the base end. As a result, in a state where the male locking member 51 protrudes from the outer surface 320a of the first invert joint plate 32L (second invert joint plate 32R), the male mold is formed on the first invert joint plate 32L (second invert joint plate 32R). The locking member 51 can be fixed.

次に、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に凹設された一対の雌型連結部４０について説明する。第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）は、一対の雌型連結部４０が設けられる位置にそれぞれ開口孔６４１が穿設されており、その内面６４０ｂには金属製の円筒状のケーシング４１が溶接ｗｐなどによって固定されている。ケーシング４１は、その軸心を開口孔６４１の略中央部に位置させている。ケーシング４１内には、収納室４２が形成されている。収納室４２の先部（前部）には、その内周面を後端側から先端側にかけて内径が徐々に縮径するテーパ面４３ａを有するテーパ穴４３が形成されている。また、収納室４２の中間部にはバネ収納部４２ａが形成されており、収納室４２の後部内周に雌ネジ４５が刻設されている。また、テーパ穴４３の先端部には、挿入口４８が開口形成されている。ケーシング４１の前端部に位置する挿入口４８は、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に形成された開口孔６４１と略同径で、開口孔６４１と連通している。また、ケーシング４１が第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に固定された状態で挿入口４８が開口孔６４１と重なった位置に配置されている。 Next, a pair of female connecting portions 40 recessed in the first connecting joint plate 640L (second connecting joint plate 640R) will be described. The first connecting joint plate 640L (second connecting joint plate 640R) is provided with opening holes 641 at positions where a pair of female connecting portions 40 are provided, and a metal cylinder is formed on the inner surface 640b thereof. The shaped casing 41 is fixed by welding wp or the like. The casing 41 has its axis positioned substantially at the center of the opening hole 641. A storage chamber 42 is formed in the casing 41. A tapered hole 43 having a tapered surface 43a whose inner diameter gradually decreases from the rear end side to the tip side is formed in the front portion (front portion) of the storage chamber 42. Further, a spring storage portion 42a is formed in the middle portion of the storage chamber 42, and a female screw 45 is engraved on the inner circumference of the rear portion of the storage chamber 42. Further, an insertion port 48 is formed at the tip of the tapered hole 43. The insertion port 48 located at the front end of the casing 41 has substantially the same diameter as the opening hole 641 formed in the first connecting joint plate 640L (second connecting joint plate 640R) and communicates with the opening hole 641. .. Further, the insertion port 48 is arranged at a position overlapping with the opening hole 641 in a state where the casing 41 is fixed to the first connecting joint plate 640L (second connecting joint plate 640R).

また、テーパ穴４３内には、分割された雌型係止部材４６が軸方向に摺動可能に配置されている。本実施形態では、図１０に示すように、周方向に３つに分割してなる楔形の雌
型係止部材４６が、ケーシング４１の軸（前後）方向に摺動可能に配設されている。図１０は、図９におけるＸ－Ｘ矢視断面図である。ここで、雌型係止部材４６の外面は、テーパ穴４３におけるテーパ面４３ａに沿って摺動可能なテーパ面４６ａとして形成されている。雌型係止部材４６のテーパ面４６ａは、先端側から後方にかけて外径が徐々に拡大している。更に、各雌型係止部材４６の内面には、雌ネジ４６ｂが形成されている。雌ネジ４６ｂは、各雌型係止部材４６の内面に、複数並設された周方向の雌側係止溝である。雌ネジ４６ｂは、ケーシング４１の軸心を中心とする円弧で且つ、軸心に沿った方向に刻設されている。以上より、複数個の雌型係止部材４６によって雌ネジ穴が形成され、各雌型係止部材４６のテーパ面４６ａがテーパ穴４３のテーパ面４３ａに沿って後退することにより、その雌ネジ穴が拡径され、前方（先方）へ移動することにより当該雌ネジ穴が縮径するようになる。なお、各雌型係止部材４６の内面に形成された雌ネジ４６ｂは、雄型係止部材５１の先端側外周部に形成された雄ネジ５１ｃと噛合させることができる。 Further, in the tapered hole 43, the divided female locking member 46 is slidably arranged in the axial direction. In the present embodiment, as shown in FIG. 10, a wedge-shaped female locking member 46 divided into three in the circumferential direction is slidably arranged in the axial (front-back) direction of the casing 41. .. FIG. 10 is a cross-sectional view taken along the line XX in FIG. Here, the outer surface of the female locking member 46 is formed as a tapered surface 46a that can slide along the tapered surface 43a in the tapered hole 43. The outer diameter of the tapered surface 46a of the female locking member 46 gradually increases from the tip side to the rear. Further, a female screw 46b is formed on the inner surface of each female locking member 46. The female screw 46b is a plurality of female-side locking grooves in the circumferential direction arranged side by side on the inner surface of each female locking member 46. The female screw 46b is an arc centered on the axis of the casing 41 and is engraved in the direction along the axis. From the above, a female screw hole is formed by the plurality of female locking members 46, and the tapered surface 46a of each female locking member 46 retracts along the tapered surface 43a of the tapered hole 43, whereby the female screw is formed. The diameter of the hole is expanded, and the female screw hole is reduced in diameter by moving forward (toward). The female screw 46b formed on the inner surface of each female locking member 46 can be meshed with the male screw 51c formed on the outer peripheral portion on the tip end side of the male locking member 51.

また、収納室４２のバネ収納部４２ａには、雌型係止部材４６を前方（先方）に押圧（弾性付勢）する押圧部材である押圧ばね４４が、各雌型係止部材４６の後端に設けられるばね受け４７と蓋板４９との間に圧縮した状態で収納されており、押圧ばね４４の押圧力によって各雌型係止部材４６を常時前方に押圧している。蓋板４９は、収納室４２の後部内周側に刻設された雌ネジ４５に螺着されることで、押圧ばね４４を圧縮した状態に保持することができる。なお、蓋板４９の外面には、六角穴４９ａが設けられており、六角レンチによって蓋板４９をケーシング４１から着脱自在になっている。 Further, in the spring storage portion 42a of the storage chamber 42, a pressing spring 44, which is a pressing member for pressing (elastically urging) the female locking member 46 forward (frontward), is provided after each female locking member 46. It is housed in a compressed state between the spring receiver 47 provided at the end and the lid plate 49, and each female locking member 46 is constantly pressed forward by the pressing force of the pressing spring 44. The lid plate 49 can hold the pressing spring 44 in a compressed state by being screwed onto the female screw 45 engraved on the rear inner peripheral side of the storage chamber 42. A hexagonal hole 49a is provided on the outer surface of the lid plate 49, and the lid plate 49 can be detached from the casing 41 by a hexagon wrench.

以上のように構成される雌型連結部４０および雄型連結部５０において、各雌型係止部材４６の内面に形成された雌ネジ４６ｂと雄型係止部材５１の外周部に形成された雄ネジ５１ｃは、ネジピッチが、ＪＩＳに規定する細目ネジのピッチよりも小さく形成されている。また、本実施形態の雌型連結部４０では各雌型係止部材４６の内面に螺旋状の雌ネジ４６ｂを形成したが、雌ネジ４６ｂに代えて、各雌型係止部材４６の周方向に伸びる環状の山部と環状の谷部を交互かつ並行に配置した並行溝を各雌型係止部材４６の内面に設けても良い。同様に、雄型連結部５０においては、雄型係止部材５１の外周部に形成した雄ネジ５１ｃに代えて、雄型係止部材５１の周方向に伸びる環状の山部と環状の谷部を交互かつ並行に配置した並行溝を雄型係止部材５１の外周面に設けても良い。 In the female connecting portion 40 and the male connecting portion 50 configured as described above, the female screw 46b formed on the inner surface of each female locking member 46 and the outer peripheral portion of the male locking member 51 are formed. The male screw 51c is formed so that the screw pitch is smaller than the pitch of the fine screw specified in JIS. Further, in the female connecting portion 40 of the present embodiment, the spiral female screw 46b is formed on the inner surface of each female locking member 46, but instead of the female screw 46b, the circumferential direction of each female locking member 46 is formed. Parallel grooves may be provided on the inner surface of each female locking member 46 in which annular peaks and annular valleys extending in an annular manner are arranged alternately and in parallel. Similarly, in the male type connecting portion 50, instead of the male screw 51c formed on the outer peripheral portion of the male type locking member 51, an annular mountain portion and an annular valley portion extending in the circumferential direction of the male type locking member 51 Parallel grooves may be provided on the outer peripheral surface of the male locking member 51 in which parallel grooves are arranged alternately and in parallel.

次に、長さ調整用鋼製支保工６０を介した左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒの相互連結について説明する。左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒの連結に際しては、図１に示したように、下半盤２３０の手前端から下方にバックホウ５００などの重機によってインバート掘削を行うことで、左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒを設置するためのインバート盤３２０が形成される。 Next, the interconnection of the left invert steel support 30L and the right invert steel support 30R via the length adjusting steel support 60 will be described. When connecting the left side invert steel support 30L and the right side invert steel support 30R, as shown in FIG. 1, invert excavation is performed downward from the front end of the lower half plate 230 by a heavy machine such as a back hoe 500. , An invert board 320 for installing the left invert steel support 30L and the right invert steel support 30R is formed.

なお、トンネルＴの軸方向におけるインバート施工部７００に対応する区間は、上半部の上半鋼製支保工１０と下半部の下半鋼製支保工２０Ｌ，２０Ｒの建て込みが既に完了している。また、下半鋼製支保工２０Ｌ，２０Ｒの両脚部を除いて、上半鋼製支保工１０および下半鋼製支保工２０Ｌに対する吹付けコンクリートの吹付けも完了している。なお、インバート施工部７００は、トンネルＴの内空断面を規定通りに確実に確保するために、インバート盤７２０には余掘りがなされている。 In the section corresponding to the invert construction section 700 in the axial direction of the tunnel T, the construction of the upper half steel support 10 and the lower half steel support 20L and 20R in the lower half has already been completed. ing. Further, the spraying of the sprayed concrete to the upper half steel support 10 and the lower half steel support 20L has been completed except for both legs of the lower half steel support 20L and 20R. In addition, the invert construction unit 700 has an extra digging in the invert board 720 in order to surely secure the inner sky cross section of the tunnel T as specified.

インバート盤７２０の掘削が完了すると、左側下半鋼製支保工２０Ｌの左側下半継手部２４Ｌに設けられている左側下半継手板２４０Ｌに、左側インバート鋼製支保工３０Ｌの第１インバート接合板３１Ｌを、ボルトによって仮締めする。また、右側下半鋼製支保工２０Ｒの右側下半継手部２４Ｒに設けられている右側下半継手板２４０Ｒに、右側インバート鋼製支保工３０Ｒの第２インバート接合板３１Ｒを、ボルトによって仮締めする。上
記の仮締めとは、左側下半鋼製支保工２０Ｌ（右側下半鋼製支保工２０Ｒ）の左側下半継手部２４Ｌ（右側下半継手部２４Ｒ）に対して左側インバート鋼製支保工３０Ｌ（右側インバート鋼製支保工３０Ｒ）がある程度、揺動可能な程度にボルトとナットを緩められている状態を指す。 When the excavation of the invert board 720 is completed, the first invert joint plate of the left invert steel support 30L is attached to the left lower half joint plate 240L provided in the left lower half joint portion 24L of the left lower half steel support 20L. Temporarily tighten 31L with bolts. Further, the second invert joint plate 31R of the right invert steel support 30R is temporarily tightened to the right lower half joint plate 240R provided in the right lower half joint portion 24R of the right lower half steel support 20R by bolts. do. The above temporary tightening is the left invert steel support 30L with respect to the left lower half joint 24L (right lower half joint 24R) of the left lower half steel support 20L (right lower half steel support 20R). (Right side invert steel support 30R) refers to a state in which the bolts and nuts are loosened to the extent that they can swing to some extent.

上記のように、左側下半鋼製支保工２０Ｌに対して左側インバート鋼製支保工３０Ｌを仮固定し、右側下半鋼製支保工２０Ｒに対して右側インバート鋼製支保工３０Ｒを仮固定した後、図１１に示すように左側インバート鋼製支保工３０Ｌと右側インバート鋼製支保工３０Ｒの間に、長さ調整用鋼製支保工６０を設置する。より詳しくは、図１１に示すように、インバート盤７２０の上に長さ調整用鋼製支保工６０を載置する。そして、長さ調整用鋼製支保工６０の第１底板部６１０の上に左側インバート鋼製支保工３０Ｌの第１インバート継手板３２Ｌ側の端部を載置すると共に、第２底板部６２０の上に右側インバート鋼製支保工３０Ｒの第２インバート継手板３２Ｒを載置する。なお、この状態では、長さ調整用鋼製支保工６０の第１底板部６１０上に載置されている左側インバート鋼製支保工３０Ｌの第１インバート継手板３２Ｌと、長さ調整用鋼製支保工６０の第１連結用継手板６４０Ｌは、対向しつつ互いに離反した状態で配置されている。同様に、長さ調整用鋼製支保工６０の第２底板部６２０上に載置されている右側インバート鋼製支保工３０Ｒの第２インバート継手板３２Ｒと、長さ調整用鋼製支保工６０の第２連結用継手板６４０Ｒは、対向しつつ互いに離反した状態で配置されている。 As described above, the left invert steel support 30L was temporarily fixed to the left lower half steel support 20L, and the right invert steel support 30R was temporarily fixed to the right lower half steel support 20R. Later, as shown in FIG. 11, a length adjusting steel support 60 is installed between the left invert steel support 30L and the right invert steel support 30R. More specifically, as shown in FIG. 11, the length adjusting steel support 60 is placed on the invert board 720. Then, the end portion of the left invert steel support 30L on the first invert joint plate 32L side is placed on the first bottom plate portion 610 of the length adjusting steel support 60, and the end of the second bottom plate portion 620 is placed. The second invert joint plate 32R of the right invert steel support 30R is placed on the right side. In this state, the first invert joint plate 32L of the left invert steel support 30L mounted on the first bottom plate 610 of the length adjustment steel support 60 and the length adjustment steel support. The first connecting joint plate 640L of the support work 60 is arranged in a state of being separated from each other while facing each other. Similarly, the second invert joint plate 32R of the right invert steel support 30R mounted on the second bottom plate portion 620 of the length adjustment steel support 60, and the length adjustment steel support 60. The second connecting joint plate 640R of the above is arranged in a state of being separated from each other while facing each other.

本実施形態においては、支保工本体６００の軸方向長さの異なる複数種類の長さ調整用鋼製支保工６０を用意しておく。そして、例えば、既に形成されている上半部および下半部の支保壁面（例えば、上半鋼製支保工１０Ｌ，１０Ｒの内空側フランジ面、下半鋼製支保工２０Ｌ，２０Ｒの内空側フランジ面）の座標を測量した測量結果に基づいて、トンネルＴにおける規定通りの内空断面を確保するために必要な支保工本体６００の必要長さを算出し、支保工本体６００の軸方向長さが上記の必要長さ以上の長さ調整用鋼製支保工６０を選択し、採用するようにしている。長さ調整用鋼製支保工６０は、例えば、支保工本体６００の長さが数ｃｍピッチで異なるものを複数種類用意しておいても良い。 In the present embodiment, a plurality of types of length adjusting steel support works 60 having different axial lengths of the support work main body 600 are prepared. Then, for example, the support wall surfaces of the upper half and the lower half already formed (for example, the inner empty side flange surface of the upper half steel support 10L, 10R, the inner space of the lower half steel support 20L, 20R). Based on the measurement result obtained by measuring the coordinates of the side flange surface), the required length of the support main body 600 required to secure the specified inner space cross section in the tunnel T is calculated, and the axial direction of the support main body 600 is calculated. A steel support 60 for length adjustment whose length is longer than the above required length is selected and adopted. As the length adjusting steel support 60, for example, a plurality of types of support main bodies 600 having different lengths at a pitch of several cm may be prepared.

そして、上記のように長さ調整用鋼製支保工６０の第１底板部６１０の上に左側インバート鋼製支保工３０Ｌの第１インバート継手板３２Ｌを載置し、第２底板部６２０の上に右側インバート鋼製支保工３０Ｒの第２インバート継手板３２Ｒを載置した状態で、バックホウ５００などの重機によって長さ調整用鋼製支保工６０を上方に吊り上げる。例えば、バックホウ５００に取り付けられた吊ワイヤの吊り具を、支保工本体６００の上フランジ６００ｂに設けられた被吊上げ部６６０に装着して、長さ調整用鋼製支保工６０を上方に吊り上げることができる。 Then, as described above, the first invert joint plate 32L of the left invert steel support 30L is placed on the first bottom plate portion 610 of the length adjusting steel support 60, and above the second bottom plate portion 620. With the second invert joint plate 32R of the right invert steel support 30R placed on the right side, the length adjustment steel support 60 is lifted upward by a heavy machine such as a back ho 500. For example, the hanging tool of the hanging wire attached to the backhoe 500 is attached to the lifted portion 660 provided on the upper flange 600b of the support main body 600, and the length adjusting steel support 60 is lifted upward. Can be done.

その際、長さ調整用鋼製支保工６０の第１底板部６１０の上に左側インバート鋼製支保工３０Ｌの第１インバート継手板３２Ｌが載置されており、第２底板部６２０の上に右側インバート鋼製支保工３０Ｒの第２インバート継手板３２Ｒが載置されているため、長さ調整用鋼製支保工６０が上方に吊り上げられることに伴って、左側インバート鋼製支保工３０Ｌにおける第１インバート継手板３２Ｌ側の端部と、右側インバート鋼製支保工３０Ｒにおける第２インバート継手板３２Ｒ側の端部が上方に持ち上げられる。 At that time, the first invert joint plate 32L of the left invert steel support 30L is placed on the first bottom plate portion 610 of the steel support 60 for length adjustment, and is placed on the second bottom plate portion 620. Since the second invert joint plate 32R of the right invert steel support 30R is mounted, the length adjustment steel support 60 is lifted upward, and the left invert steel support 30L is the first. The end of the 1 invert joint plate 32L side and the end of the right invert steel support 30R on the 2nd invert joint plate 32R side are lifted upward.

ここで、左側インバート鋼製支保工３０Ｌは、第１インバート接合板３１Ｌが左側下半鋼製支保工２０Ｌにおける左側下半継手部２４Ｌの左側下半継手板２４０Ｌに仮固定されているため、ある程度は揺動可能である。そのため、左側インバート鋼製支保工３０Ｌにおける第１インバート継手板３２Ｌ側の端部が上方に持ち上がることに伴い、第１底板部６１０の表面を第１インバート継手板３２Ｌの下縁が摺動する結果、第１インバート継手板３２Ｌが第１連結用継手板６４０Ｌに接近する。 Here, in the left invert steel support 30L, the first invert joint plate 31L is temporarily fixed to the left lower half joint plate 240L of the left lower half joint portion 24L in the left lower half steel support 20L to some extent. Can swing. Therefore, as the end of the left invert steel support 30L on the side of the first invert joint plate 32L is lifted upward, the lower edge of the first invert joint plate 32L slides on the surface of the first bottom plate portion 610. , The first invert joint plate 32L approaches the first connecting joint plate 640L.

また、右側インバート鋼製支保工３０Ｒは、第２インバート接合板３１Ｒが右側下半鋼製支保工２０Ｒにおける右側下半継手部２４Ｒの右側下半継手板２４０Ｒに仮固定されているため、ある程度は揺動可能である。そのため、右側インバート鋼製支保工３０Ｒにおける第２インバート継手板３２Ｒ側の端部が上方に持ち上がることに伴い、第２底板部６２０の表面を第２インバート継手板３２Ｒが摺動する結果、第２インバート継手板３２Ｒが第２連結用継手板６４０Ｒに接近する。 Further, in the right invert steel support 30R, since the second invert joint plate 31R is temporarily fixed to the right lower half joint plate 240R of the right lower half joint portion 24R in the right lower half steel support 20R, to some extent. It can swing. Therefore, as the end portion of the right invert steel support 30R on the side of the second invert joint plate 32R is lifted upward, the second invert joint plate 32R slides on the surface of the second bottom plate portion 620, resulting in the second. The invert joint plate 32R approaches the second connecting joint plate 640R.

本実施形態においては、長さ調整用鋼製支保工６０の第１底板部６１０の上に左側インバート鋼製支保工３０Ｌの第１インバート継手板３２Ｌが載置された状態で、第１インバート継手板３２Ｌに凸設された一対の雄型連結部５０の高さと、第１連結用継手板６４０Ｌに凹設された一対の雌型連結部４０（挿入口４８、開口孔６４１）の高さが合致するように調整されている。また、長さ調整用鋼製支保工６０の第１底板部６１０の横幅寸法、第１連結用継手板６４０Ｌの横幅寸法、および第１インバート継手板３２Ｌの横幅寸法は互いに等しく、第１連結用継手板６４０Ｌの横幅寸法および第１インバート継手板３２Ｌの横幅寸法の位置が合致した状態で、第１インバート継手板３２Ｌに凸設された一対の雄型連結部５０と、第１連結用継手板６４０Ｌに凹設された一対の雌型連結部４０（挿入口４８、開口孔６４１）の横幅方向の位置が合致するように調整されている。そして、上記のように、第１底板部６１０には、第１インバート継手板３２Ｌの横ずれを抑制するストッパー部材６１１ａ，６１１ｂが設けられているため、ストッパー部材６１１ａ，６１１ｂにガイドされた状態で第１底板部６１０上を第１インバート継手板３２Ｌが摺動することで、第１インバート継手板３２Ｌに凸設された一対の雄型連結部５０と第１連結用継手板６４０Ｌに凹設された一対の雌型連結部４０（挿入口４８、開口孔６４１）の横幅方向の位置および高さ位置が合致した状態で、第１インバート継手板３２Ｌを第１連結用継手板６４０Ｌに接近させることができる。 In the present embodiment, the first invert joint is placed on the first bottom plate portion 610 of the length adjusting steel support 60 with the first invert joint plate 32L of the left invert steel support 30L. The height of the pair of male connecting portions 50 projecting on the plate 32L and the height of the pair of female connecting portions 40 (insertion port 48, opening hole 641) recessed in the first connecting joint plate 640L Adjusted to match. Further, the width dimension of the first bottom plate portion 610 of the length adjusting steel support 60, the width dimension of the first connection joint plate 640L, and the width dimension of the first invert joint plate 32L are equal to each other, and are used for the first connection. With the positions of the width dimension of the joint plate 640L and the width dimension of the first invert joint plate 32L matched, the pair of male connecting portions 50 projecting on the first invert joint plate 32L and the first connecting joint plate. The positions of the pair of female connecting portions 40 (insertion port 48, opening hole 641) recessed in 640L in the lateral width direction are adjusted to match. As described above, since the first bottom plate portion 610 is provided with stopper members 611a and 611b for suppressing lateral displacement of the first invert joint plate 32L, the first invert joint plate portion 610 is guided by the stopper members 611a and 611b. By sliding the first invert joint plate 32L on the bottom plate portion 610, the pair of male connecting portions 50 projecting on the first invert joint plate 32L and the first connecting joint plate 640L were recessed. The first invert joint plate 32L may be brought closer to the first connection plate 640L in a state where the position in the width direction and the height position of the pair of female connecting portions 40 (insertion port 48, opening hole 641) match. can.

同様に、本実施形態においては、長さ調整用鋼製支保工６０の第２底板部６２１０の上に右側インバート鋼製支保工３０Ｒの第２インバート継手板３２Ｒが載置された状態で、第２インバート継手板３２Ｒに凸設された一対の雄型連結部５０の高さと、第２連結用継手板６４０Ｒに凹設された一対の雌型連結部４０（挿入口４８、開口孔６４１）の高さが合致するように調整されている。また、長さ調整用鋼製支保工６０の第２底板部６２０の横幅寸法、第２連結用継手板６４０Ｒの横幅寸法、および第２インバート継手板３２Ｒの横幅寸法は互いに等しく、第２連結用継手板６４０Ｒの横幅寸法および第２インバート継手板３２Ｒの横幅寸法の位置が合致した状態で、第２インバート継手板３２Ｒに凸設された一対の雄型連結部５０と、第２連結用継手板６４０Ｒに凹設された一対の雌型連結部４０（挿入口４８、開口孔６４１）の横幅方向の位置が合致するように調整されている。上記のように、第２底板部６２０には、第２インバート継手板３２Ｒの横ずれを抑制するストッパー部材６２１ａ，６２１ｂが設けられているため、ストッパー部材６２１ａ，６２１ｂにガイドされた状態で第２底板部６２０上を第２インバート継手板３２Ｒが摺動することで、第２インバート継手板３２Ｒに凸設された一対の雄型連結部５０と第２連結用継手板６４０Ｒに凹設された一対の雌型連結部４０（挿入口４８、開口孔６４１）の横幅方向の位置および高さ位置が合致した状態で、第２インバート継手板３２Ｒを第２連結用継手板６４０Ｒに接近させることができる。 Similarly, in the present embodiment, the second invert joint plate 32R of the right invert steel support 30R is placed on the second bottom plate portion 6210 of the length adjusting steel support 60. 2 The height of the pair of male connecting portions 50 projecting on the invert joint plate 32R and the pair of female connecting portions 40 (insertion port 48, opening hole 641) recessed in the second connecting joint plate 640R. The height is adjusted to match. Further, the width dimension of the second bottom plate portion 620 of the steel support 60 for length adjustment, the width dimension of the second connection joint plate 640R, and the width dimension of the second invert joint plate 32R are equal to each other, and are used for the second connection. With the positions of the width dimension of the joint plate 640R and the width dimension of the second invert joint plate 32R matched, the pair of male connecting portions 50 projecting on the second invert joint plate 32R and the second connecting joint plate. The positions of the pair of female connecting portions 40 (insertion port 48, opening hole 641) recessed in the 640R in the lateral width direction are adjusted to match. As described above, since the second bottom plate portion 620 is provided with stopper members 621a and 621b for suppressing lateral displacement of the second invert joint plate 32R, the second bottom plate is guided by the stopper members 621a and 621b. By sliding the second invert joint plate 32R on the portion 620, a pair of male connecting portions 50 projecting on the second invert joint plate 32R and a pair recessed in the second connecting joint plate 640R. The second invert joint plate 32R can be brought closer to the second connection plate 640R in a state where the position in the lateral width direction and the height position of the female connecting portion 40 (insertion port 48, opening hole 641) match.

以上のように、本実施形態においては、重機によって長さ調整用鋼製支保工６０を上方にリフトすることで、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）に凸設された一対の雄型連結部５０と第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に凹設された一対の雌型連結部４０の平面位置（横位置および高さ）を合致させた状態で、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）を第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に接近させることができる。そのため、第１インバ
ート継手板３２Ｌ（第２インバート継手板３２Ｒ）に凸設された一対の雄型連結部５０の雄型係止部材５１を第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の開口孔６４１を通じて、雌型連結部４０の挿入口４８に挿入させることができる。なお、本実施形態において、雄型係止部材５１の外径は、開口孔６４１および雌型連結部４０（ケーシング４１）の挿入口４８よりも若干小径で、且つ、各雌型係止部材４６がテーパ穴４３（テーパ面４３ａ）の最前進位置に配置された状態で、各雌型係止部材４６によって形成される雌ネジ穴の直径よりも若干大径に設定されている。 As described above, in the present embodiment, the length adjusting steel support 60 is lifted upward by a heavy machine, so that the pair is projected on the first invert joint plate 32L (second invert joint plate 32R). A state in which the plane positions (horizontal position and height) of the pair of female connecting portions 40 recessed in the male connecting portion 50 and the first connecting joint plate 640L (second connecting joint plate 640R) are matched. Therefore, the first invert joint plate 32L (second invert joint plate 32R) can be brought close to the first connection joint plate 640L (second connection joint plate 640R). Therefore, the male locking member 51 of the pair of male connecting portions 50 projecting on the first invert joint plate 32L (second invert joint plate 32R) is replaced with the first connecting joint plate 640L (second connecting joint plate). It can be inserted into the insertion port 48 of the female connecting portion 40 through the opening hole 641 of 640R). In the present embodiment, the outer diameter of the male locking member 51 is slightly smaller than the opening hole 641 and the insertion port 48 of the female connecting portion 40 (casing 41), and each female locking member 46. Is arranged at the most advanced position of the tapered hole 43 (tapered surface 43a), and is set to have a diameter slightly larger than the diameter of the female screw hole formed by each female locking member 46.

第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）に凸設された雄型係止部材５１が第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の開口孔６４１を通じて雌型連結部４０の挿入口４８に挿入されると、押圧ばね４４の押圧力によって前端部にテーパ穴４３（テーパ面４３ａ）の最前進位置に位置決めされている各雌型係止部材４６の前端面４６ｃに雄型係止部材５１の先端部５１ｄが当接する。そして、雄型係止部材５１が押圧ばね４４の押圧力に抗して、各雌型係止部材４６をテーパ面４３ａに沿って、雌型連結部４０（ケーシング４１）の軸方向後方に向かって後退させることで、各雌型係止部材４６におけるテーパ面４６ａの雌ネジ４６ｂによって形成されている雌ネジ穴を拡径しつつ雄型係止部材５１が収納室４２内に挿入される。 The male locking member 51 projecting from the first invert joint plate 32L (second invert joint plate 32R) is female connected through the opening hole 641 of the first connection joint plate 640L (second connection joint plate 640R). When inserted into the insertion port 48 of the portion 40, the front end surface 46c of each female locking member 46 positioned at the most advanced position of the tapered hole 43 (tapered surface 43a) at the front end portion by the pressing force of the pressing spring 44. The tip portion 51d of the male locking member 51 comes into contact with the male type locking member 51. Then, the male locking member 51 opposes the pressing force of the pressing spring 44 and directs each female locking member 46 along the tapered surface 43a to the rear in the axial direction of the female connecting portion 40 (casing 41). The male locking member 51 is inserted into the storage chamber 42 while expanding the diameter of the female screw hole formed by the female screw 46b on the tapered surface 46a of each female locking member 46.

そして、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）の外面３２０ａと第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の外面６４０ａとが当接することで面接触し、雌型連結部４０における収納室４２内への雄型係止部材５１の挿入が完了することで、それ以上の収納室４２内への雄型係止部材５１の挿入が停止されると、各雌型係止部材４６は押圧ばね４４の押圧力によって前方（先方）に押し戻されると共に、各雌型係止部材４６のテーパ面４６ａによって形成される雌ネジ穴が縮径する。その結果、図１２に示すように、雌型連結部４０における各雌型係止部材４６の雌ネジ４６ｂ（雌側係止溝）及び雄型連結部５０における雄型係止部材５１の雄ネジ５１ｃ（雄側係止溝）が相互に噛合する。これによって、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）と第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）が面接触した状態で接合される。その結果、図４、６等に示したように、左右一対の左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒが長さ調整用鋼製支保工６０を介して一体に連結される。 Then, the outer surface 320a of the first invert joint plate 32L (second invert joint plate 32R) and the outer surface 640a of the first connection joint plate 640L (second connection joint plate 640R) come into contact with each other to make surface contact, and the female When the insertion of the male locking member 51 into the storage chamber 42 in the mold connecting portion 40 is completed and the further insertion of the male locking member 51 into the storage chamber 42 is stopped, each female The mold locking member 46 is pushed back forward (toward) by the pressing force of the pressing spring 44, and the female screw hole formed by the tapered surface 46a of each female locking member 46 is reduced in diameter. As a result, as shown in FIG. 12, the female screw 46b (female side locking groove) of each female locking member 46 in the female connecting portion 40 and the male screw of the male locking member 51 in the male connecting portion 50. 51c (male side locking groove) mesh with each other. As a result, the first invert joint plate 32L (second invert joint plate 32R) and the first connection joint plate 640L (second connection joint plate 640R) are joined in a state of surface contact. As a result, as shown in FIGS. 4 and 6, a pair of left and right invert steel support 30L and right invert steel support 30R are integrally connected via a length adjusting steel support 60. ..

ここで、図１２に示したように、雌型連結部４０の雌ネジ４６ｂと雄型連結部５０（雄型係止部材５１）の雄ネジ５１ｃが噛合した状態で、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）と第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）を離反する方向に外力が作用した場合、雌型連結部４０における収納室４２から雄型係止部材５１を引き抜く方向に引き抜き力が作用する。この引き抜き力は、互いに噛み合う雄ネジ５１ｃと雌ネジ４６ｂを介して各雌型係止部材４６に伝達される。ところで、各雌型係止部材４６のテーパ面４６ａは後方側から前方にかけて外径が徐々に縮小している。そのため、上記引き抜き力が各雌型係止部材４６に作用しても、各雌型係止部材４６がテーパ穴４３の前方に向かって変位することが制限される。すなわち、雌型連結部４０の収納室４２から雄型係止部材５１を引き抜く方向に外力が作用しても、当該外力に対抗して連結状態を維持することができる。 Here, as shown in FIG. 12, the first invert joint plate 32L is in a state where the female screw 46b of the female connecting portion 40 and the male screw 51c of the male connecting portion 50 (male locking member 51) are meshed with each other. When an external force acts in the direction of separating the (second invert joint plate 32R) and the first connection joint plate 640L (second connection joint plate 640R), the male type is locked from the storage chamber 42 in the female type connection portion 40. A pulling force acts in the direction of pulling out the member 51. This pulling force is transmitted to each female locking member 46 via the male screw 51c and the female screw 46b that mesh with each other. By the way, the outer diameter of the tapered surface 46a of each female locking member 46 gradually decreases from the rear side to the front side. Therefore, even if the pull-out force acts on each female locking member 46, the displacement of each female locking member 46 toward the front of the tapered hole 43 is restricted. That is, even if an external force acts in the direction of pulling out the male locking member 51 from the storage chamber 42 of the female connecting portion 40, the connected state can be maintained against the external force.

つまり、本実施形態においては、雌型連結部４０の挿入口４８から雄型連結部５０（雄型係止部材５１）を挿入する動作だけで、雌型連結部４０に対して雄型連結部５０が連結されるため、簡単に長さ調整用鋼製支保工６０を左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒに対して一体に接合することができる。また、雌型連結部４０における収納室４２から雄型係止部材５１を引き抜く方向に引き抜き力が作用しても、雌型連結部４０および雄型連結部５０の連結が解除されることを抑制できる。 That is, in the present embodiment, only the operation of inserting the male connecting portion 50 (male locking member 51) from the insertion port 48 of the female connecting portion 40 is enough to insert the male connecting portion 50 into the female connecting portion 40. Since the 50s are connected, the length adjusting steel support 60 can be easily integrally joined to the left invert steel support 30L and the right invert steel support 30R. Further, even if a pulling force acts in the direction of pulling out the male locking member 51 from the storage chamber 42 in the female connecting portion 40, the connection between the female connecting portion 40 and the male connecting portion 50 is suppressed. can.

以上のように、本実施形態においては、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）に凸設された一対の雄型連結部５０と第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に凹設された一対の雌型連結部４０をワンタッチで接合することができ、従来のようにボルトおよびナットの締結を人手作業で行うことが不要となる。従って、左右一対の左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒの連結作業時に、作業者が揚重機に接触する接触事故や、各インバート鋼製支保工３０Ｌ，３０Ｒや長さ調整用鋼製支保工６０への作業者手足の挟まれ事故を好適に抑制できる。つまり、インバート鋼製支保工の施工時における安全性や施工性を従来よりも向上させることができる。 As described above, in the present embodiment, the pair of male connecting portions 50 and the first connecting joint plate 640L (for the second connecting) convexly provided on the first invert joint plate 32L (second invert joint plate 32R). The pair of female connecting portions 40 recessed in the joint plate 640R) can be joined with one touch, and it is not necessary to manually fasten the bolts and nuts as in the conventional case. Therefore, during the connection work of the pair of left and right invert steel support 30L and the right invert steel support 30R, a contact accident in which the worker comes into contact with the lifting machine, and each invert steel support 30L, 30R and length adjustment Accidents in which workers' hands and feet are pinched by steel support 60 can be suitably suppressed. That is, it is possible to improve the safety and workability at the time of construction of the invert steel support work as compared with the conventional case.

左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒの連結の完了後は、左側下半鋼製支保工２０Ｌにおける左側下半継手部２４Ｌの左側下半継手板２４０Ｌと、左側インバート鋼製支保工３０Ｌにおける第１インバート接合板３１Ｌとのボルト本締めを行う。同様に、右側下半鋼製支保工２０Ｒにおける右側下半継手部２４Ｒの右側下半継手板２４０Ｒと、右側インバート鋼製支保工３０Ｒにおける第２インバート接合板３１Ｒとのボルト本締めを行う。そして、これらの本締めを行った後、下半鋼製支保工２０Ｌ，２０Ｒの両脚部と、インバート鋼製支保工３０Ｌ，３０Ｒ、および長さ調整用鋼製支保工６０に対して吹付けコンクリートの吹付けを行うことでインバート施工が完了し、トンネルＴの断面全周が閉合することで力学的安定性が確保される。 After the connection of the left invert steel support 30L and the right invert steel support 30R is completed, the left lower half joint plate 240L of the left lower half joint portion 24L in the left lower half steel support 20L and the left invert steel The bolt is finally tightened with the first invert joint plate 31L in the support work 30L. Similarly, bolt final tightening is performed between the right lower half joint plate 240R of the right lower half joint portion 24R in the right lower half steel support 20R and the second invert joint plate 31R in the right invert steel support 30R. Then, after these final tightening, sprayed concrete is applied to both legs of the lower semi-steel support 20L and 20R, the invert steel support 30L and 30R, and the length adjusting steel support 60. The invert construction is completed by spraying, and the entire circumference of the cross section of the tunnel T is closed to ensure mechanical stability.

更に、本実施形態においては、図１０に示したように、雄型係止部材５１の先端部５１ｄには、先端に向かって縮径するテーパ面５１ｅが形成されている。このため、左側インバート鋼製支保工３０Ｌ（右側インバート鋼製支保工３０Ｒ）と長さ調整用鋼製支保工６０を連結する際に、雌型連結部４０の挿入口４８と雄型係止部材５１の中心位置が相対的に多少ずれていたとしても、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の開口孔６４１の縁部に沿って雄型係止部材５１のテーパ面５１ｅを摺動させることで、雌型連結部４０における挿入口４８と、雄型係止部材５１の中心同士の位置ずれ量が減少する方向に雄型係止部材５１をガイドし、雄型係止部材５１を雌型連結部４０の挿入口４８へと円滑に導くことができる。なお、雄型係止部材５１の先端部５１ｄに形成するテーパ面５１ｅのディテールは適宜変更できる。例えば、雄型係止部材５１の先端部５１ｄを円錐形状として形成しても良い。この場合、当該円錐形状の側面がテーパ面５１ｅとして形成される。 Further, in the present embodiment, as shown in FIG. 10, the tip portion 51d of the male locking member 51 is formed with a tapered surface 51e whose diameter is reduced toward the tip. Therefore, when connecting the left invert steel support 30L (right side invert steel support 30R) and the length adjusting steel support 60, the insertion port 48 of the female connecting portion 40 and the male locking member are connected. Even if the center position of 51 is relatively slightly displaced, the tapered surface of the male locking member 51 is along the edge of the opening hole 641 of the first connecting joint plate 640L (second connecting joint plate 640R). By sliding the 51e, the male locking member 51 is guided in the direction in which the amount of misalignment between the insertion port 48 in the female connecting portion 40 and the center of the male locking member 51 is reduced, and the male locking member 51 is engaged. The stop member 51 can be smoothly guided to the insertion port 48 of the female connecting portion 40. The details of the tapered surface 51e formed on the tip portion 51d of the male locking member 51 can be appropriately changed. For example, the tip portion 51d of the male locking member 51 may be formed in a conical shape. In this case, the side surface of the conical shape is formed as a tapered surface 51e.

＜変形例＞
図１３は、実施形態１の変形例に係る連結構造を説明する図である。本変形例に係る第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に形成された開口孔６４１は、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の厚さ方向における内面６４０ｂから外面６４０ａにかけて拡径するテーパ面６４１ａを有している。このように、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）の開口孔６４１にテーパ面６４１ａを形成することで、左側インバート鋼製支保工３０Ｌ（右側インバート鋼製支保工３０Ｒ）と長さ調整用鋼製支保工６０を連結する際に、雌型連結部４０の挿入口４８と雄型係止部材５１の中心位置が相対的に多少ずれていたとしても、開口孔６４１におけるテーパ面６４１ａを雄型係止部材５１が摺動することで、雌型連結部４０における挿入口４８と雄型係止部材５１の中心同士の位置ずれ量が小さくなる方向に雄型係止部材５１をガイドすることができる。これによれば、雄型係止部材５１を雌型連結部４０の挿入口４８へと円滑に導くことができる。 <Modification example>
FIG. 13 is a diagram illustrating a connection structure according to a modified example of the first embodiment. The opening hole 641 formed in the first connecting joint plate 640L (second connecting joint plate 640R) according to this modification is in the thickness direction of the first connecting joint plate 640L (second connecting joint plate 640R). Has a tapered surface 641a whose diameter increases from the inner surface 640b to the outer surface 640a. In this way, by forming the tapered surface 641a in the opening hole 641 of the first connecting joint plate 640L (second connecting joint plate 640R), the left side invert steel support 30L (right side invert steel support 30R). Even if the center positions of the insertion port 48 of the female connecting portion 40 and the male locking member 51 are relatively slightly misaligned when connecting the length adjusting steel support work 60 to the opening hole 641. When the male locking member 51 slides on the tapered surface 641a, the male locking member reduces the amount of misalignment between the center of the insertion port 48 and the male locking member 51 in the female connecting portion 40. 51 can be guided. According to this, the male locking member 51 can be smoothly guided to the insertion port 48 of the female connecting portion 40.

また、上記実施形態においては、第１インバート継手板３２Ｌおよび第２インバート継手板３２Ｒに雄型連結部５０を凸設し、第１連結用継手板６４０Ｌおよび第２連結用継手
板６４０Ｒに一対の雌型連結部４０を凹設する例を説明したが、これには限られず、雄型連結部５０を凸設する側と、雌型連結部４０を凹設する側とを入れ替えても良い。例えば、第１連結用継手板６４０Ｌ（第２連結用継手板６４０Ｒ）に雄型連結部５０を設け、第１インバート継手板３２Ｌ（第２インバート継手板３２Ｒ）に雌型連結部４０を設けても良い。また、上記実施形態では、長さ調整用鋼製支保工６０を重機によって上方に吊り上げながら、長さ調整用鋼製支保工６０を介して左側インバート鋼製支保工３０Ｌおよび右側インバート鋼製支保工３０Ｒを連結する態様を説明したが、長さ調整用鋼製支保工６０の吊り上げは重機以外で行っても良い。例えば、ウインチ等といった巻き上げ機の動力を利用して長さ調整用鋼製支保工６０を吊り上げても良い。 Further, in the above embodiment, the male connecting portion 50 is convexly provided on the first invert joint plate 32L and the second invert joint plate 32R, and a pair is provided on the first connecting joint plate 640L and the second connecting joint plate 640R. The example in which the female connecting portion 40 is recessed has been described, but the present invention is not limited to this, and the side on which the male connecting portion 50 is convex and the side on which the female connecting portion 40 is recessed may be exchanged. For example, the male connecting portion 50 is provided on the first connecting joint plate 640L (second connecting joint plate 640R), and the female connecting portion 40 is provided on the first invert joint plate 32L (second invert joint plate 32R). Is also good. Further, in the above embodiment, while the length adjusting steel support 60 is lifted upward by a heavy machine, the left invert steel support 30L and the right invert steel support 60 are passed through the length adjustment steel support 60. Although the embodiment of connecting the 30Rs has been described, the length adjusting steel support 60 may be lifted by a machine other than a heavy machine. For example, the length adjusting steel support 60 may be lifted by using the power of a hoist such as a winch.

以上、本発明の実施形態および変形例を説明したが、本発明に係るインバート鋼製支保工の連結構造はこれらに限られず、可能な限りこれらを組み合わせることができる。 Although the embodiments and modifications of the present invention have been described above, the connecting structure of the invert steel support according to the present invention is not limited to these, and these can be combined as much as possible.

１・・・鋼製支保構造
１０・・・上半鋼製支保工
１０Ｌ・・・左側上半鋼製支保工
１０Ｒ・・・右側上半鋼製支保工
２０Ｌ・・・左側下半鋼製支保工
２０Ｒ・・・右側下半鋼製支保工
３０Ｌ・・・左側インバート鋼製支保工
３０Ｒ・・・右側インバート鋼製支保工
４０・・・雌型連結部
５０・・・雄型連結部
５１・・・雄型係止部材
６０・・・長さ調整用鋼製支保工
６００・・・支保工本体
６１０・・・第１底板部
６２０・・・第２底板部 1 ... Steel support structure 10 ... Upper half steel support 10L ... Left upper half steel support 10R ... Right upper half steel support 20L ... Left lower half steel support Work 20R ・ ・ ・ Right lower semi-steel support 30L ・ ・ ・ Left invert steel support 30R ・ ・ ・ Right Invert steel support 40 ・ ・ ・ Female connection 50 ・ ・ ・ Male connection 51 ・・ ・ Male locking member 60 ・ ・ ・ Steel support for length adjustment 600 ・ ・ ・ Support body 610 ・ ・ ・ 1st bottom plate 620 ・ ・ ・ 2nd bottom plate

Claims (4)

トンネルの下半鋼製支保工の両脚部に一端がそれぞれ接合された、トンネル底部に設置される一対のインバート鋼製支保工の連結構造であって、
前記一対のインバート鋼製支保工の他端にそれぞれ設けられた第１インバート継手板および第２インバート継手板と、
前記一対のインバート鋼製支保工の間に介在すると共に、前記一対のインバート鋼製支保工同士を連結する長さ調整用鋼製支保工と、
を備え、
前記長さ調整用鋼製支保工は、
前記第１インバート継手板と接合される第１連結用継手板と、
前記第２インバート継手板と接合される第２連結用継手板と、
前記第１インバート継手板および前記第１連結用継手板の一方に凸設された第１雄型連結部と、他方に凹設されると共に当該第１雄型連結部を挿入可能な第１雌型連結部と、
前記第２インバート継手板および前記第２連結用継手板の一方に凸設された第２雄型連結部と、他方に凹設されると共に当該第２雄型連結部を挿入可能な第２雌型連結部と、
を有し、
且つ、前記第１インバート継手板および前記第２インバート継手板を支持する第１および第２の底板部が、前記第１連結用継手板および前記第２連結用継手板の下縁から前記長さ調整用鋼製支保工の軸方向に沿って延設されており、
前記第１雌型連結部が前記第１雄型連結部を係止し、前記第２雌型連結部が前記第２雄型連結部を係止することで、前記一対のインバート鋼製支保工のそれぞれに前記長さ調整用鋼製支保工が連結され、
前記一対のインバート鋼製支保工に対する前記長さ調整用鋼製支保工の連結時に、前記第１および第２の底板部に前記第１インバート継手板および前記第２インバート継手板が支持された状態で前記長さ調整用鋼製支保工が上方に吊り上げられることで、前記第１雌型連結部および前記第２雌型連結部に対して、前記第１雄型連結部および前記第２雄型連結部がそれぞれガイドされる、
インバート鋼製支保工の連結構造。 It is a connecting structure of a pair of invert steel supports installed at the bottom of the tunnel, with one end joined to both legs of the lower half steel support of the tunnel.
The first invert joint plate and the second invert joint plate provided at the other ends of the pair of invert steel supports, respectively,
A length-adjusting steel support that intervenes between the pair of invert steel supports and connects the pair of invert steel supports to each other.
Equipped with
The steel support for length adjustment is
The first connecting joint plate to be joined to the first invert joint plate,
A second connecting joint plate to be joined to the second invert joint plate,
A first male connecting portion projecting on one of the first invert joint plate and the first connecting joint plate, and a first female that is recessed on the other and into which the first male connecting portion can be inserted. With the mold connection part,
A second male connecting portion projected on one of the second invert joint plate and the second connecting joint plate, and a second female recessed on the other and into which the second male connecting portion can be inserted. With the mold connection part,
Have,
Moreover, the first and second bottom plate portions supporting the first invert joint plate and the second invert joint plate have the length from the lower edge of the first connection joint plate and the second connection joint plate. It extends along the axial direction of the adjustment steel support.
The first female type connecting portion locks the first male type connecting portion, and the second female type connecting portion locks the second male type connecting portion, whereby the pair of invert steel support works. The steel support for length adjustment is connected to each of the above .
A state in which the first invert joint plate and the second invert joint plate are supported on the first and second bottom plates when the length adjusting steel support is connected to the pair of invert steel supports. The length adjusting steel support is lifted upward so that the first female connecting portion and the second female connecting portion can be compared with the first male connecting portion and the second male connecting portion. Each connection is guided,
Invert steel timbering structure. トンネルの下半鋼製支保工の両脚部に一端がそれぞれ接合された、トンネル底部に設置される一対のインバート鋼製支保工同士を連結する連結方法であって、
前記一対のインバート鋼製支保工の他端にはそれぞれ第１インバート継手板および第２インバート継手板が設けられており、
前記連結方法は、
前記第１インバート継手板と接合される第１連結用継手板と、前記第２インバート継手板と接合される第２連結用継手板と、前記第１インバート継手板および前記第１連結用継手板の一方に凸設された第１雄型連結部と他方に凹設されると共に当該第１雄型連結部を挿入可能な第１雌型連結部と、前記第２インバート継手板および前記第２連結用継手板の一方に凸設された第２雄型連結部と他方に凹設されると共に当該第２雄型連結部を挿入可能な第２雌型連結部と、前記第１連結用継手板および前記第２連結用継手板の下縁から前記長さ調整用鋼製支保工の軸方向に沿ってそれぞれ延設されると共に前記第１インバート継手板および前記第２インバート継手板を支持する第１および第２の底板部と、を有する、長さ調整用鋼製支保工をインバート盤上に載置する長さ調整用鋼製支保工設置工程と、
前記長さ調整用鋼製支保工の前記第１の底板部および第２の底板部にそれぞれ前記第１インバート継手板および前記第２インバート継手板を載置するインバート継手板載置工程と、
前記長さ調整用鋼製支保工を上方に吊り上げることで、前記第１雌型連結部によって前記第１雄型連結部を係止すると共に前記第２雌型連結部によって前記第２雄型連結部を係止することで、前記一対のインバート鋼製支保工のそれぞれに前記長さ調整用鋼製支保工を連結する吊り上げ連結工程と、
を含む、
インバート鋼製支保工の連結方法。 It is a connection method to connect a pair of invert steel supports installed at the bottom of the tunnel, one end of which is joined to both legs of the lower half steel support of the tunnel.
A first invert joint plate and a second invert joint plate are provided at the other ends of the pair of invert steel supports, respectively.
The connection method is
A first connecting joint plate to be joined to the first invert joint plate, a second connecting joint plate to be joined to the second invert joint plate, the first invert joint plate and the first connecting joint plate. A first male-type connecting portion that is convex on one side, a first female-type connecting portion that is recessed on the other side and into which the first male-type connecting portion can be inserted, the second invert joint plate, and the second. A second male connecting portion projecting on one side of the connecting joint plate, a second female connecting portion recessed on the other and into which the second male connecting portion can be inserted, and the first connecting joint. It extends from the lower edge of the plate and the second connecting joint plate along the axial direction of the length adjusting steel support, and supports the first invert joint plate and the second invert joint plate. A length-adjusting steel support installation process for mounting a length-adjusting steel support on an invert board, which has first and second bottom plates.
An invert joint plate mounting step of mounting the first invert joint plate and the second invert joint plate on the first bottom plate portion and the second bottom plate portion of the length adjusting steel support, respectively.
By lifting the length adjusting steel support upward, the first female connecting portion locks the first male connecting portion and the second female connecting portion engages with the second male connecting portion. A lifting connection step of connecting the length adjusting steel support to each of the pair of invert steel supports by locking the portions.
including,
Invert steel timbering method. 前記吊り上げ連結工程において、前記長さ調整用鋼製支保工を重機によって上方に吊り上げる、
請求項２に記載のインバート鋼製支保工の連結方法。 In the lifting connection step, the length adjusting steel support is lifted upward by a heavy machine.
The method for connecting an invert steel support according to claim 2 . 前記インバート継手板載置工程において、前記第１インバート継手板と前記第１連結用継手板が対向しつつ互いに離反し、前記第２インバート継手板と前記第２連結用継手板が対向しつつ互いに離反した状態で配置されるように、前記第１の底板部および第２の底板部にそれぞれ前記第１インバート継手板および前記第２インバート継手板を載置し、
前記吊り上げ連結工程において前記長さ調整用鋼製支保工が上方に吊り上げられることで、前記第１の底板部上を前記第１インバート継手板が摺動すると共に前記第２の底板部上を前記第２インバート継手板が摺動する結果、前記第１インバート継手板と前記第１連結用継手板が接近すると共に前記第２インバート継手板と前記第２連結用継手板が接近し、前記第１雌型連結部および前記第２雌型連結部に対して前記第１雄型連結部および前記第２雄型連結部がそれぞれガイドされる、
請求項２又は３に記載のインバート鋼製支保工の連結方法。
In the invert joint plate mounting step, the first invert joint plate and the first connection joint plate are opposed to each other and separated from each other, and the second invert joint plate and the second connection joint plate are opposed to each other. The first invert joint plate and the second invert joint plate are placed on the first bottom plate portion and the second bottom plate portion, respectively, so as to be arranged in a separated state.
In the lifting connection step, the length adjusting steel support is lifted upward so that the first invert joint plate slides on the first bottom plate and the second bottom plate is above the second bottom plate. As a result of the second invert joint plate sliding, the first invert joint plate and the first connection joint plate approach each other, and the second invert joint plate and the second connection joint plate approach each other, and the first The first male type connecting portion and the second male type connecting portion are guided to the female type connecting portion and the second female type connecting portion, respectively.
The method for connecting invert steel support according to claim 2 or 3 .
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