JP7326199B2

JP7326199B2 - Segment joints and segments

Info

Publication number: JP7326199B2
Application number: JP2020053653A
Authority: JP
Inventors: 吉孝岩崎; 育雄藤木; 淳小泉; 博之水上; 達也津田
Original assignee: Nippon Concrete Industries Co Ltd
Current assignee: Nippon Concrete Industries Co Ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2023-08-15
Anticipated expiration: 2040-03-25
Also published as: JP2021152314A

Description

本発明は、トンネル覆工等で用いられるセグメントを接続する技術であって、より詳細には、トンネル周方向において隣接するセグメント同士を接続するための技術に関する。 TECHNICAL FIELD The present invention relates to a technology for connecting segments used in tunnel lining or the like, and more particularly to a technology for connecting adjacent segments in the circumferential direction of a tunnel.

トンネル覆工においては、掘削孔の内壁面に円環状のライナーを配置して掘削孔の崩壊等を防止している。当該円環状のライナーは、円周方向に複数個のセグメントを接続して構成されている。
トンネル覆工に際しては、トンネル（或いは円環状のライナー）の円周方向に隣接するセグメント同士を接続して円環状のライナーを掘削孔内壁に配置する。そして掘削孔（或いはトンネル）が延在すると共に、掘削孔（トンネル）の長手方向に円環状のライナーを隣接して接続する。 In tunnel lining, an annular liner is placed on the inner wall surface of a borehole to prevent collapse of the borehole. The annular liner is constructed by connecting a plurality of segments in the circumferential direction.
When lining the tunnel, a ring-shaped liner is arranged on the inner wall of the excavation hole by connecting adjacent segments of the tunnel (or ring-shaped liner) in the circumferential direction. A borehole (or tunnel) then extends and connects adjacent toroidal liners in the longitudinal direction of the borehole (tunnel).

セグメントをトンネル円周方向に接続するに際しては、接続するべき一方のセグメントに雌継手、他方のセグメントに雄継手を埋設して固定し、雄継手の一部を雌継手に挿入することにより、セグメント同士を接続している。
そのようなセグメント継手としては、円周方向に隣接したセグメント同士を容易に接続することが出来て、しかも、セグメントを離隔させる方向に外力が作用してもセグメント同士の接続が容易に解除されないことが要求されている。そして、係る要求に応えることが出来るセグメント継手が、既に提案されている（特許文献１参照）。
係る従来技術（特許文献１）は大変に有用であるが、雄継手と雌継手の形状が複雑であり、製造に係る労力及びコストが大変に大きいという問題を有している。それと共に、隣接するセグメントの接続面の中央部に雄継手或いは雌継手を設けて、単一の継手によりセグメントを周方向に接続する用途を主としているため、その寸法及び重量が大きいという問題も有している。 When connecting the segments in the circumferential direction of the tunnel, a female joint is embedded in one segment to be connected and a male joint is embedded in the other segment, and a part of the male joint is inserted into the female joint to connect the segments. connecting each other.
As such a segment joint, it is possible to easily connect segments adjacent in the circumferential direction, and moreover, the connection between the segments should not be easily released even if an external force acts in the direction of separating the segments. is required. A segment joint that can meet such demands has already been proposed (see Patent Document 1).
The prior art (Patent Document 1) is very useful, but has the problem that the shapes of the male and female joints are complicated, and the labor and cost involved in manufacturing are very high. At the same time, since it is mainly used for connecting segments in the circumferential direction by providing a male joint or female joint in the central part of the connection surface of adjacent segments, there is also the problem that the size and weight are large. are doing.

特許第６４６０９７０号公報Japanese Patent No. 6460970

本発明は上述した従来技術の問題点に鑑みて提案されたものであり、円周方向に隣接したセグメント同士を容易に接続することが出来て、セグメントを離隔させる方向に外力が作用してもセグメント同士の接続が容易に解除されず、しかも、形状が複雑ではなく、小型・軽量化を実現することが出来るセグメント継手と、その様なセグメント継手を備えたセグメントを提供することを目的としている。 The present invention has been proposed in view of the above-mentioned problems of the prior art. It is possible to easily connect segments adjacent to each other in the circumferential direction, even if an external force acts in the direction of separating the segments. To provide a segment joint which does not easily disconnect segments, does not have a complicated shape, and realizes reduction in size and weight, and to provide a segment equipped with such a segment joint. .

本発明のセグメント継手（１００）は雄継手（１０）と雌継手（２０）から構成され、
雄継手（１０）は雄継手本体部（１）を有し、雄継手本体部（１）は雌継手（２０）と係合する雄継手先端部（３）及びその反対側端部に設けられてセグメント（ＳＧ）に埋設される雄継手アンカー部（４）を有し、
雄継手先端部（３）は、雄継手本体部（１）の長手方向（図１では左右方向）に対して直交する方向（図１では上下方向）の何れか一方（図１では上方）が突出して雄継手凸部（３Ａ）を形成し、他方（図１では下方）は窪んで雄継手凹部（３Ｂ）を形成し、雄継手凸部（３Ａ）及び雄継手凹部（３Ｂ）の雄継手アンカー部（４）側縁部は肩部（３ＡＡ、３ＢＡ：段差）を形成しており、
雌継手（２０）は雌継手本体部（２）を有し、雌継手本体部（２）は雄継手（１０）と係合する雌継手先端部（５）及びその反対側端部に設けられてセグメント（ＳＧ）に埋設される雌継手アンカー部（６）を有しており、
雌継手先端部（５）は雄継手先端部（３）と相補的な形状の内部空間（５Ｓ）を備え、当該内部空間（５Ｓ）の雌継手本体部（２）の長手方向（図３では左右方向）に対して直交する方向（図３では上下方向）の何れか一方（図３では上方）が窪んで雌継手凹部（５Ａ）を形成し、他方（図３では下方）には突出した雌継手凸部（５Ｂ：図３では板状の部材）を形成し、雌継手凸部（５Ｂ）の雌継手アンカー部（６）から離隔した側の縁部（５ＢＡ）は前記雄継手凹部（３Ｂ）の肩部（３ＢＡ）と相補的な形状であり、雌継手凹部（５Ａ）の雌継手アンカー部（６）から離隔した側の縁部（５ＡＡ）は前記雄継手凸部（３Ａ）の肩部（３ＡＡ）と相補的な形状であることを特徴としている。 The segment joint (100) of the present invention is composed of a male joint (10) and a female joint (20),
The male joint (10) has a male joint body (1) which is provided at a male joint tip (3) which engages with the female joint (20) and at its opposite end. has a male joint anchor part (4) embedded in the segment (SG),
The tip of the male joint (3) is oriented in one of the directions (vertical direction in FIG. 1) perpendicular to the longitudinal direction (horizontal direction in FIG. 1) of the male joint main body (1) (upward in FIG. 1). The male joint protrusion (3A) is projected to form the male joint protrusion (3A), and the other (lower side in FIG. 1) is recessed to form the male joint recess (3B). The side edges of the anchor part (4) form shoulders (3AA, 3BA: steps),
The female joint (20) has a female joint body (2) provided at a female joint tip (5) that engages the male joint (10) and at the opposite end. has a female joint anchor part (6) embedded in the segment (SG),
The female joint tip (5) has an internal space (5S) with a complementary shape to the male joint tip (3), and the internal space (5S) extends in the longitudinal direction of the female joint main body (2) (in FIG. 3, Left-right direction), one of which (upward in FIG. 3) is recessed to form a female joint recess (5A), and the other (downward in FIG. 3) protrudes. A female joint convex portion (5B: a plate-like member in FIG. 3) is formed, and the edge (5BA) of the female joint convex portion (5B) on the side away from the female joint anchor portion (6) is the male joint concave portion ( 3B), and the edge (5AA) of the female joint concave portion (5A) on the side remote from the female joint anchor portion (6) is the shape of the male joint convex portion (3A). It is characterized by a complementary shape to the shoulder (3AA).

ここで、セグメント（ＳＧ）の半径方向外方（地山側）の領域に埋設される雄継手（１０）では、雄継手本体部（１）の長手方向（図１では左右方向）に対して直交する方向（図１では上下方向）であって、雄継手（１０）が埋設されるセグメント（ＳＧ）の半径方向外方（地山側）が突出して雄継手凸部（３Ａ）を形成しているのが好ましい。
そして、セグメント（ＳＧ）の半径方向外方（地山側）の領域に埋設されている雌継手（２０）では、雌継手本体部（２）の長手方向（図３では左右方向）に対して直交する方向（図３では上下方向）であって、雌継手（２０）が埋設されるセグメント（ＳＧ）の半径方向外方（地山側）が窪んで雌継手凹部（５Ａ）を形成しているのが好ましい。 Here, in the male joint (10) embedded in the region radially outward (on the ground side) of the segment (SG), the longitudinal direction (horizontal direction in FIG. 1) of the male joint main body (1) direction (vertical direction in FIG. 1), the segment (SG) in which the male joint (10) is embedded protrudes radially outward (toward the natural ground) to form a male joint projection (3A). is preferred.
In the female joint (20) embedded in the region radially outward (on the ground side) of the segment (SG), the longitudinal direction (horizontal direction in FIG. 3) of the female joint main body (2) is orthogonal to the The radially outward direction (ground side) of the segment (SG) in which the female joint (20) is embedded is recessed to form the female joint recess (5A). is preferred.

一方、セグメント（ＳＧ）の半径方向内方（ライナーの内部空間側）の領域に埋設される雄継手（１０）では、雄継手本体部（１）の長手方向（図１では左右方向）に対して直交する方向（図１では上下方向）であって、雄継手（１０）が埋設されるセグメント（ＳＧ）の半径方向内方（ライナーの内部空間側）が突出して雄継手凸部（３Ａ）を形成しているのが好ましい。
そして、セグメント（ＳＧ）の半径方向内方（ライナーの内部空間側）の領域に埋設されている雌継手（２０）では、雌継手本体部（２）の長手方向（図３では左右方向）に対して直交する方向（図３では上下方向）であって、雌継手（２０）が埋設されるセグメント（ＳＧ）の半径方向内方（ライナーの内部空間側）が窪んで雌継手凹部（５Ａ）を形成しているのが好ましい。 On the other hand, in the male joint (10) embedded in the region radially inward (on the inner space side of the liner) of the segment (SG), the longitudinal direction (horizontal direction in FIG. 1) of the male joint main body (1) is 1), the segment (SG) in which the male joint (10) is embedded protrudes radially inward (on the inner space side of the liner) to form a male joint protrusion (3A). is preferably formed.
In the female joint (20) embedded in the region radially inward of the segment (SG) (inner space side of the liner), in the longitudinal direction (horizontal direction in FIG. 3) of the female joint main body (2) 3), the radially inner side (inner space side of the liner) of the segment (SG) in which the female joint (20) is embedded is recessed to form a female joint recess (5A). is preferably formed.

本発明のセグメント継手（１００）において、雄継手凹部（３Ｂ）の肩部（３ＢＡ）と雌継手凸部（５Ｂ）の雌継手アンカー部（６）から離隔した側の縁部（５ＢＡ）は（図１、図３の矢印Ｖ方向の）テーパー部を構成しており、当該テーパー部は雄継手（１０）及び雌継手（２０）（が埋設されているセグメント）に作用する外力の方向（抜け方向：図８の矢印Ｒ方向）に対して傾斜している（図８の矢印Ｖ方向）のが好ましい。 In the segment joint (100) of the present invention, the shoulder (3BA) of the male joint recess (3B) and the edge (5BA) of the female joint protrusion (5B) on the side remote from the female joint anchor (6) are ( 1 and 3), and the tapered portion acts on the male joint (10) and the female joint (20) (segments in which they are embedded) in the direction of the external force (disconnection). Direction: preferably inclined (direction of arrow V in FIG. 8) with respect to direction of arrow R in FIG.

本発明のセグメント（ＳＧ）では、上述したセグメント継手（１００：請求項１～４の何れか１項のセグメント継手）を周方向端面に埋設しており、
雌継手（２０）を埋設したセグメント（ＳＧ）の周方向端面から雌継手先端部（５）が突出しており、セグメント（ＳＧ）を接続した際に隣接するセグメント（ＳＧ）の境界に雄継手先端部（３）と係合した雌継手先端部（５）が位置することを特徴としている。 In the segment (SG) of the present invention, the above-described segment joint (100: the segment joint according to any one of claims 1 to 4) is embedded in the circumferential end face,
The female joint tip (5) protrudes from the circumferential end face of the segment (SG) in which the female joint (20) is embedded, and when the segments (SG) are connected, the male joint tip is positioned at the boundary between the adjacent segments (SG). It is characterized by the presence of a female coupling tip (5) in engagement with the part (3).

上述の構成を具備する本発明によれば、雄継手本体部（１）の長手方向（図１では左右方向）に対して直交する方向（図１では上下方向）の何れか一方（図１では上方）だけが突出して雄継手凸部（３Ａ）を形成し、雌継手先端部（５）の内部空間（５Ｓ）の雌継手本体部（２）の長手方向（図３では左右方向）に対して直交する方向（図３では上下方向）の何れか一方（図３では上方）のみが窪んで雌継手凹部（５Ａ）を形成しているため、雄継手（１０）は上述した従来技術（特許文献１）の雄継手を長手方向中心線で２分割した様な形状（いわゆる「半割」形状）となっており、雌継手は上述した従来技術（特許文献１）の雌継手を長手方向中心線で２分割した様な形状（いわゆる「半割」形状）となっている。そして、半割形状とした分だけ雄継手及び雌継手における凹凸が上述した従来技術（特許文献１）に比較して少なくなり、形状が簡便になっている。そのため、凹凸が多く複雑な形状の従来技術（特許文献１）に比較して製造に係る労力、コストを節減することが出来る。
また、半割形状としているため、上述した従来技術（特許文献１）に比較して、雄継手及び雌継手の小型軽量化を実現している。
雄継手（１０）と雌継手（２０）を接続（係合）するに際しては、雌継手先端部（５）の内部空間（５Ｓ）における雌継手凹部（５Ａ）に雄継手先端部（３）の雄継手凸部（３Ａ）を挿入すれば、雄継手凸部（３Ａ）が雌継手凹部（５Ａ）と係合するので、雄継手（１０）が埋設されたセグメント（ＳＧ）と雌継手（２０）が埋設されたセグメント（ＳＧ）を容易に（いわゆる「ワンタッチ」で）接続することが出来る。 According to the present invention having the above-described configuration, one of the directions (vertical direction in FIG. 1) perpendicular to the longitudinal direction (horizontal direction in FIG. 1) of the male joint main body (1) (vertical direction in FIG. 1) Only the upper part) protrudes to form a male joint convex part (3A), and the internal space (5S) of the female joint tip part (5) with respect to the longitudinal direction (horizontal direction in FIG. 3) of the female joint main body part (2) The female joint recess (5A) is formed by denting only one of the directions (upward and downward in FIG. 3) perpendicular to each other (upward and downward in FIG. 3). The male joint of Document 1) is divided into two along the longitudinal center line (so-called "half-split" shape), and the female joint is the female joint of the above-mentioned prior art (Patent Document 1), which is centered in the longitudinal direction. It has a shape that is divided into two by a line (a so-called “half-split” shape). In addition, the half-split shape reduces the unevenness of the male and female joints compared to the above-described prior art (Patent Document 1), thereby simplifying the shape. Therefore, it is possible to reduce the labor and cost involved in manufacturing, compared to the conventional technology (Patent Document 1) which has many irregularities and a complicated shape.
In addition, since it has a halved shape, it is possible to reduce the size and weight of the male joint and the female joint as compared with the above-described conventional technology (Patent Document 1).
When connecting (engaging) the male joint (10) and the female joint (20), the male joint tip (3) is inserted into the female joint recess (5A) in the internal space (5S) of the female joint tip (5). When the male joint protrusion (3A) is inserted, the male joint protrusion (3A) engages with the female joint recess (5A), so that the segment (SG) in which the male joint (10) is embedded and the female joint (20) are connected. ) are embedded in the segments (SG) can be easily connected (so-called “one-touch”).

また本発明のセグメント継手（１００）或いは本発明のセグメント（ＳＧ）において、（トンネル周方向に）隣接するセグメント（ＳＧ）の各々の接合面において、雄継手（１０）及び／又は雌継手（２０）が半径方向内方の領域と半径方向外方の領域にそれぞれ設けられており、雄継手（１０）の雄継手凸部（３Ａ）が突出している方向と、当該雄継手凸部（３Ａ）と係合する雌継手（２０）の雌継手凹部（５Ａ）が形成されている方向を、半径方向内方の領域と半径方向外方の領域で相違させれば、セグメント（ＳＧ）に外力（例えば土圧等）が作用した場合に、外力が作用する方向と隣接するセグメント同士の接続面或いは境界の相対的な位置関係により、引張力が作用する場合と圧縮力が作用する場合とがあるが、その様な引張力及び圧縮力を効果的に支持することが出来る。
より詳細には、隣接するセグメント同士の境界に引張力が作用する場合は、雄継手の凸部（３Ａ）と雌継手の凹部（５Ａ）の係合部が、当該引張力を支持或いは負荷している。そのため、セグメント（ＳＧ）が負荷できない引張力を雄継手（１０）と雌継手（２０）が負荷するので、セグメント（ＳＧ）に外力（例えば土圧等）が作用しても、発生した引張力を確実に負荷することが出来る。
一方、セグメント（ＳＧ）に外力して隣接するセグメント同士の接続面或いは境界に圧縮力が作用した場合には、雄継手凸部（３Ａ）と雌継手凹部（５Ａ）とが係合、当接しており、且つ、雄継手凹部（３Ｂ）と雌継手凸部（５Ｂ）も係合、当接しているので、雄継手凸部（３Ａ）と雌継手凹部（５Ａ）の係合面及び雄継手凹部（３Ｂ）と雌継手凸部（５Ｂ）の係合面により圧縮力を負荷することが出来る。セグメント（ＳＧ）を構成するコンクリート自体が圧縮力を負荷することに加えて、雄継手（１０）及び雌継手（２０）の凹部（３Ｂ）、（５Ａ）及び凸部（３Ａ）、（５Ｂ）が負荷することにより、セグメント（ＳＧ）に外力（例えば土圧等）が作用しても、発生した引張力を確実に負荷することが出来る。 Further, in the segment joint (100) of the present invention or the segment (SG) of the present invention, the male joint (10) and/or the female joint (20 ) are provided in the radially inner region and the radially outer region, respectively, and the direction in which the male joint protrusion (3A) of the male joint (10) protrudes and the male joint protrusion (3A) If the direction in which the female joint concave portion (5A) of the female joint (20) that engages with is formed is different between the radially inner region and the radially outer region, an external force ( For example, earth pressure, etc.), depending on the direction in which the external force acts and the relative positional relationship between the connecting surfaces or boundaries of the adjacent segments, there are cases where a tensile force acts and cases where a compressive force acts. can effectively support such tensile and compressive forces.
More specifically, when a tensile force acts on the boundary between adjacent segments, the engaging portions of the convex portion (3A) of the male joint and the concave portion (5A) of the female joint support or load the tensile force. ing. Therefore, since the male joint (10) and the female joint (20) load a tensile force that the segment (SG) cannot load, even if an external force (such as earth pressure) acts on the segment (SG), the generated tensile force can be reliably loaded.
On the other hand, when an external force acts on the segment (SG) and a compressive force acts on the connecting surfaces or boundaries between the adjacent segments, the male joint protrusion (3A) and the female joint recess (5A) are engaged and abutted. In addition, since the male joint concave portion (3B) and the female joint convex portion (5B) are also engaged and abutted, the engagement surfaces of the male joint convex portion (3A) and the female joint concave portion (5A) and the male joint Compressive force can be applied by the engagement surfaces of the concave portion (3B) and the female joint convex portion (5B). In addition to the compressive force exerted by the concrete constituting the segment (SG) itself, the recesses (3B), (5A) and protrusions (3A), (5B) of the male joint (10) and the female joint (20) By loading the segment (SG), even if an external force (for example, earth pressure, etc.) acts on the segment (SG), the generated tensile force can be reliably loaded.

ここで従来の継手では、雄継手と雌継手が係合した後、セグメントの自重などの外力に起因して、雄継手が雌継手から係合解除されて抜け出てしまい、隣接するセグメントから抜け落ちてしまう恐れが存在する。
それに対して本発明のセグメント継手（１００）では、雄継手凹部（３Ｂ）の肩部（３ＢＡ）と雌継手凸部（５Ｂ）の雌継手アンカー部（６）から離隔した側の縁部（５ＢＡ）は（図１、図３の矢印Ｖ方向の）テーパー部を構成しており、当該テーパー部が雄継手（１０）及び雌継手（２０）（が埋設されているセグメント）に作用する外力の方向（抜け方向：図８の矢印Ｒ方向）に対して傾斜しているので（図８の矢印Ｖ方向）、次の述べる様な作用効果を生じる。
すなわち、セグメント（ＳＧ）の自重などの外力に起因して雄継手（１０）が雌継手（２０）から係合解除されて、継手が埋設されているセグメント（ＳＧ）が隣接するセグメント（ＳＧ）から抜け出そうとしても、テーパー部の傾斜が当該継手（１０）、（２０）を埋設したセグメント（ＳＧ）に作用する重力（外力）が作用する方向（抜け方向Ｒ）に対して傾斜しており、外力の作用する方向（Ｒ）が、雄継手（１０）及び雌継手（２０）におけるテーパー部の傾斜方向（Ｖ）と異なる。そのため、当該外力（セグメントＳＧに作用する重力）は雄継手凹部（３Ｂ）の肩部（３ＢＡ）のテーパー部と雌継手凸部（５Ｂ）の雌継手アンカー部（６）から離隔した側の縁部（５ＢＡ）のテーパー部が互いに圧縮しあう方向に作用し、テーパー部同士が相互移動することを抑制する様に作用するので、雄継手（１０）と雌継手（２０）が相対移動することは防止される。その結果、雄側凹部（３Ｂ）のテーパー部と雌側凸部（５Ｂ）のテーパー部が摺動してしまうことが防止され、雄継手（１０）と雌継手（２０）は係合解除せず、セグメント（ＳＧ）が抜け落ちてしまうことが防止される。 Here, in conventional joints, after the male joint and the female joint are engaged, the male joint is disengaged from the female joint due to an external force such as the weight of the segments and falls out of the adjacent segment. There is a danger of being lost.
On the other hand, in the segment joint (100) of the present invention, the shoulder (3BA) of the male joint recess (3B) and the edge (5BA) of the female joint protrusion (5B) on the side away from the female joint anchor (6) ) constitutes a tapered portion (in the direction of arrow V in FIGS. 1 and 3), and the tapered portion acts on the male joint (10) and the female joint (20) (segments in which they are embedded). Since it is inclined (in the direction of arrow V in FIG. 8) with respect to the direction (removal direction: direction of arrow R in FIG. 8), the following effects are produced.
That is, the male joint (10) is disengaged from the female joint (20) due to an external force such as the weight of the segment (SG), and the segment (SG) in which the joint is embedded is adjacent to the segment (SG). Even if the joints (10) and (20) are embedded, the inclination of the tapered portion is inclined with respect to the direction of gravity (external force) acting on the segments (SG) in which the joints (10) and (20) are embedded (removal direction R). , the direction (R) in which the external force acts is different from the inclination direction (V) of the tapered portions of the male joint (10) and the female joint (20). Therefore, the external force (gravitational force acting on the segment SG) is applied to the tapered portion of the shoulder portion (3BA) of the male joint recess (3B) and the edge of the female joint protrusion (5B) away from the female joint anchor portion (6). Since the tapered portions of the portion (5BA) act in the direction of compressing each other and act to suppress the mutual movement of the tapered portions, the male joint (10) and the female joint (20) do not move relative to each other. is prevented. As a result, the tapered portion of the male concave portion (3B) and the tapered portion of the female convex portion (5B) are prevented from sliding, and the male joint (10) and the female joint (20) are disengaged. Therefore, it is possible to prevent the segment (SG) from falling off.

また本発明のセグメント（ＳＧ）によれば、雌継手（２０）を埋設したセグメント（ＳＧ）の周方向端面から雌継手先端部（５）が突出しており、セグメント（ＳＧ）を接続した際に隣接するセグメント（ＳＧ）の境界に雄継手先端部（３）と係合した雌継手先端部（５）が位置するので、隣接するセグメント（ＳＧ）の境界に作用するせん断力は断面積が大きく、雄継手先端（３）と係合している雌継手先端部（５）が受け持つことになる。
従来は断面積が小さい雄継手の延在している部分（特許文献１では雄継手の本体部）が隣接するセグメントの境界に位置して、セグメント間に作用するせん断力を支持していたのに比較して、本発明における雄継手先端部（３）と係合している雌継手先端部（５）の断面積の方が大きいので、同一の素材であれば、耐せん断力が向上する。 According to the segment (SG) of the present invention, the female joint tip (5) protrudes from the circumferential end face of the segment (SG) in which the female joint (20) is embedded, so that when the segment (SG) is connected, Since the female joint tip (5) engaged with the male joint tip (3) is positioned at the boundary of the adjacent segments (SG), the shear force acting on the boundary of the adjacent segments (SG) has a large cross-sectional area. , the female coupling tip (5) in engagement with the male coupling tip (3).
Conventionally, the extended portion of the male joint with a small cross-sectional area (the main body of the male joint in Patent Document 1) was positioned at the boundary between the adjacent segments to support the shear force acting between the segments. Compared to , the cross-sectional area of the female joint tip (5) engaged with the male joint tip (3) in the present invention is larger, so if the same material is used, the shear resistance is improved. .

図示の実施形態で用いられる雄継手を示す斜視図である。FIG. 4 is a perspective view of a male coupling used in the illustrated embodiment; 雄継手におけるテーパー部を説明する図１のＡ２矢視説明図である。It is an A2 arrow view explanatory drawing of FIG. 1 explaining the taper part in a male joint. 図示の実施形態で用いられる雌継手を示す斜視図である。FIG. 4 is a perspective view of a female coupling used in the illustrated embodiment; 雌継手におけるテーパー部を説明する図３のＡ４矢視説明図である。It is an A4 arrow view explanatory drawing of FIG. 3 explaining the taper part in a female joint. 雌継手における組み立ての一態様を説明する部分説明図である。FIG. 4 is a partial explanatory view explaining one mode of assembly in the female joint; 雄継手と雌継手を係合する一工程を示す説明図である。It is explanatory drawing which shows 1 process which engages a male joint and a female joint. 雄継手と雌継手が係合した状態を示す説明図である。FIG. 5 is an explanatory diagram showing a state in which the male joint and the female joint are engaged; 雄継手と雌継手が係合した状態における要部を示す部分拡大説明図である。FIG. 4 is a partially enlarged explanatory view showing the main parts in a state where the male joint and the female joint are engaged; 継手のセグメント半径方向位置により、雄継手凸部が突出する方向及び雌継手凹部が窪む方向が異なることを示す説明図である。FIG. 8 is an explanatory view showing that the direction in which the male joint protrusion protrudes and the direction in which the female joint recess is recessed differ depending on the segment radial position of the joint. 図示の実施形態における雌継手先端部と隣接するセグメントの境界との相対位置を説明する説明図である。FIG. 10 is an explanatory diagram illustrating the relative positions of the distal end of the female joint and the boundaries of adjacent segments in the illustrated embodiment;

以下、添付図面を参照して、本発明の実施形態について説明する。
最初に図１～図８を参照して、図示の実施形態に係るセグメント継手を説明する。
図示の実施形態におけるセグメント継手１００は、雄継手１０及び雌継手２０から構成されている。
図１において、雄継手１０は雄継手本体部１を有し、雄継手本体部１は雌継手２０と係合する雄継手先端部３と雄継手アンカー部４を有している。雄継手アンカー部４は雄継手先端部３の反対側端部に設けられ、図示しないセグメントに埋設される。
雄継手先端部３は、雄継手本体部１の長手方向（図１では左右方向）に対して直交する方向（図１では上下方向）の一方、図１では上方、が突出して雄継手凸部３Ａを形成している。そして、雄継手本体部１の長手方向に対して直交する方向の他方（図１では下方）は窪んで、雄継手凹部３Ｂを形成している。
雄継手凸部３Ａと雄継手凹部３Ｂの雄継手アンカー部４側の縁部は、それぞれ肩部３ＡＡ、３ＢＡを形成しており、肩部３ＡＡ、３ＢＡは雄継手本体部１と段差を形成している。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
1-8, a segment joint according to the illustrated embodiment will be described.
The segment joint 100 in the illustrated embodiment consists of a male joint 10 and a female joint 20 .
In FIG. 1, a male joint 10 has a male joint main body portion 1, and the male joint main body portion 1 has a male joint distal end portion 3 and a male joint anchor portion 4 that engage with a female joint 20. As shown in FIG. A male joint anchor portion 4 is provided at the opposite end of the male joint tip portion 3 and is embedded in a segment (not shown).
The male joint distal end portion 3 protrudes in one direction (the vertical direction in FIG. 1) perpendicular to the longitudinal direction of the male joint main body portion 1 (the lateral direction in FIG. 1), which is upward in FIG. 3A is formed. The other side (lower side in FIG. 1) of the male joint main body 1 in the direction orthogonal to the longitudinal direction is recessed to form a male joint concave portion 3B.
The edges of the male joint convex portion 3A and the male joint concave portion 3B on the side of the male joint anchor portion 4 form shoulder portions 3AA and 3BA, respectively. ing.

雄継手アンカー部４は、雄継手本体部１の長手方向（図１では左右方向）に対して直交する方向、図１では上下方向、に延在する板状部材により構成されており、図１では図示しないセグメントに埋設、定着される。図示の実施形態においては、雄継手アンカー部４は、雄継手本体部１と同一の幅寸法（図１の紙面に対して垂直方向における長さ）を有している。
図１及び図２で示す様に、雄継手本体部１には軽量化のための貫通孔１Ａが形成されている。貫通孔１Ａに代えて窪みを形成して、軽量化を図ることも出来る。
雄継手本体部１の雄継手凸部３Ａは、後述する雌継手２０における雌継手先端部５の雌継手凹部５Ａと係合する様に構成されている。雄継手１０は前記従来技術（特許文献１）における雄継手を長手方向中心線で２分割した様な形状（いわゆる「半割」形状）となっている。そして、後述する雌継手２０は前記従来技術（特許文献１）の雌継手を長手方向中心線で２分割した様な形状（いわゆる「半割」形状）となっている。
図示の実施形態に係る雄継手本体部１は、鍛造により一体成型することが可能であり、また鋳造することも可能である。 The male joint anchor portion 4 is composed of a plate-like member extending in a direction orthogonal to the longitudinal direction of the male joint main body portion 1 (horizontal direction in FIG. 1), which is a vertical direction in FIG. is embedded and fixed in a segment (not shown). In the illustrated embodiment, the male joint anchor portion 4 has the same width dimension (the length in the direction perpendicular to the plane of FIG. 1) as the male joint main body portion 1 .
As shown in FIGS. 1 and 2, the male joint main body 1 is formed with a through hole 1A for weight reduction. It is also possible to reduce the weight by forming a recess instead of the through hole 1A.
The male joint convex portion 3A of the male joint main body portion 1 is configured to engage with the female joint concave portion 5A of the female joint distal end portion 5 of the female joint 20, which will be described later. The male joint 10 has a shape (a so-called “half-split” shape) in which the male joint in the prior art (Patent Document 1) is divided into two along the longitudinal center line. A female joint 20, which will be described later, has a shape (a so-called "half-split" shape) in which the female joint of the prior art (Patent Document 1) is divided into two along the longitudinal center line.
The male joint body 1 according to the illustrated embodiment can be integrally molded by forging, or can be cast.

図１のＡ２矢視図である図２において、雄継手凸部３Ａの肩部３ＡＡは破線で表示されており、雄継手凹部３Ｂの肩部３ＢＡは実線で表示されている。
雄継手凸部３Ａの肩部３ＡＡ、雄継手凹部３Ｂの肩部３ＢＡは、それぞれ、図１の矢印Ｖ方向にテーパー部を形成している。肩部３ＡＡ、３ＢＡの各々におけるテーパー部は、後述する雌継手凹部５Ａの縁部５ＡＡ、雌継手凸部５Ｂの縁部５ＢＡと係合した際に、雄継手及び／又は雌継手が埋設されたセグメント（図１、図２では図示せず）に外力が発生した場合に、雄継手凸部３Ａと雌継手凹部５Ａの係合状態と、雄側凹部３Ｂと雌側凸部５Ｂの係合状態が解除されない様に構成されている。従来技術（特許文献１）でも、雄継手の先端部と雌継手の鉤状部分にテーパー部が形成されているが、当該従来技術におけるテーパー部は雄継手の先端部を雌継手の鉤状部分に挿入するのを容易にするために形成されており、その点で、図示の実施形態のテーパー部とは相違している。雄継手１０と雌継手２０の係合解除を防止する構成及び作用効果については、図８を参照して後述する。 In FIG. 2, which is a view along arrow A2 in FIG. 1, the shoulder portion 3AA of the male joint convex portion 3A is indicated by a broken line, and the shoulder portion 3BA of the male joint concave portion 3B is indicated by a solid line.
A shoulder portion 3AA of the male joint convex portion 3A and a shoulder portion 3BA of the male joint concave portion 3B each form a tapered portion in the direction of arrow V in FIG. A tapered portion of each of the shoulder portions 3AA and 3BA has a male joint and/or a female joint embedded therein when engaged with an edge portion 5AA of a female joint concave portion 5A and an edge portion 5BA of a female joint convex portion 5B, which will be described later. When an external force is generated in a segment (not shown in FIGS. 1 and 2), the engagement state between the male joint protrusion 3A and the female joint recess 5A, and the engagement state between the male side recess 3B and the female side protrusion 5B. is configured so that is not released. In the prior art (Patent Document 1) as well, a tapered portion is formed at the tip of the male joint and the hook-shaped portion of the female joint. It differs from the tapered portion of the illustrated embodiment in that respect. The configuration and effect of preventing disengagement of the male joint 10 and the female joint 20 will be described later with reference to FIG.

雌継手凹部５Ａの縁部５ＡＡ、雌継手凸部５Ｂの縁部５ＢＡにもテーパー部が形成されている。
図示の実施形態において、雄継手凸部３Ａの肩部３ＡＡ、雄継手凹部３Ｂの肩部３ＢＡにおけるテーパーは、例えば１／１０である。 An edge portion 5AA of the female joint concave portion 5A and an edge portion 5BA of the female joint convex portion 5B are also tapered.
In the illustrated embodiment, the taper at the shoulder 3AA of the male joint projection 3A and the shoulder 3BA of the male joint recess 3B is, for example, 1/10.

図３において、雌継手２０は雌継手本体部２を有し、雌継手本体部２は雄継手１０と係合する雌継手先端部５及び雌継手アンカー部６を有している。雌継手先端部５は雄継手１０と係合する部分であり、雌継手アンカー部６は雌継手先端部５の反対側端部に設けられてセグメント（図３、図４では図示せず）に埋設される。
雌継手先端部５は内部空間５Ｓを備え、内部空間５Ｓは雄継手先端部３と相補的な形状を有し、雄継手１０と雌継手２０が係合する際に内部空間５Ｓに雄継手先端部３が挿入される。
内部空間５Ｓの雌継手本体部２の長手方向（図３では左右方向）に対して直交する方向（図３では上下方向）の一方（図３では上方）が窪んで雌継手凹部５Ａを構成している。雌継手本体部２の長手方向に対して直交する方向の他方（図３では下方）に、図３では右方向（図３では図示しない雄継手１０側）に板状部材が突出しており、当該突出した板状部材が雌継手凸部５Ｂを構成している。
そして、雌継手凸部５Ｂにおいて、雌継手アンカー部６から離隔した側（図３、図４では右側）の縁部５ＢＡは、雄継手凹部３Ｂの肩部３ＢＡと相補的な形状である。また、雌継手凹部５Ａにおいて、雌継手アンカー部６から離隔した側（図３、図４では右側）の縁部５ＡＡは、雄継手凸部３Ａの肩部３ＡＡと相補的な形状である。 In FIG. 3, the female joint 20 has a female joint main body portion 2, and the female joint main body portion 2 has a female joint distal end portion 5 and a female joint anchor portion 6 that engage with the male joint 10. As shown in FIG. The female joint tip 5 is a portion that engages with the male joint 10, and the female joint anchor 6 is provided at the opposite end of the female joint tip 5 and attached to a segment (not shown in FIGS. 3 and 4). Buried.
The female joint distal end portion 5 has an internal space 5S, the internal space 5S has a shape complementary to the male joint distal end portion 3, and the male joint distal end portion is formed in the internal space 5S when the male joint 10 and the female joint 20 are engaged. Part 3 is inserted.
One (upper in FIG. 3) of the internal space 5S perpendicular to the longitudinal direction (horizontal direction in FIG. 3) of the female joint main body 2 is recessed to form the female joint concave portion 5A. ing. A plate member protrudes in the other direction perpendicular to the longitudinal direction of the female joint main body 2 (downward in FIG. 3) and rightward in FIG. The protruding plate-like member constitutes the female joint convex portion 5B.
In the female joint projection 5B, the edge 5BA on the side remote from the female joint anchor 6 (on the right side in FIGS. 3 and 4) has a shape complementary to the shoulder 3BA of the male joint recess 3B. Further, in the female joint concave portion 5A, the edge portion 5AA on the side away from the female joint anchor portion 6 (on the right side in FIGS. 3 and 4) has a shape complementary to the shoulder portion 3AA of the male joint convex portion 3A.

雌継手アンカー部６は、雌継手本体部２の長手方向（図３では左右方向）に対して直交する方向（図３では上下方向）に延在する板状部材であり、図３では表示しないセグメントに埋設されて、定着される。図示の実施形態の雌継手アンカー部６では、雌継手本体部２と同一の幅寸法（図３の紙面に垂直方向の長さ）を有している。
図３及び図４に示す様に、雌継手本体部２には軽量化のための貫通孔２Ａが形成されている。貫通孔２Ａに代えて窪みを形成しても良い。
ここで、雌継手２０（ただし雌継手凸部５Ｂを除いた部分）は上述した従来技術（特許文献１）の雌継手を長手方向中心線で２分割した様な形状（いわゆる「半割」形状）となっている。 The female joint anchor portion 6 is a plate-like member extending in a direction (vertical direction in FIG. 3) perpendicular to the longitudinal direction (horizontal direction in FIG. 3) of the female joint body portion 2, and is not shown in FIG. Embedded in the segment and anchored. The female joint anchor portion 6 of the illustrated embodiment has the same width dimension (the length in the direction perpendicular to the plane of FIG. 3) as that of the female joint main body portion 2 .
As shown in FIGS. 3 and 4, the female joint main body 2 is formed with a through hole 2A for weight reduction. A depression may be formed instead of the through hole 2A.
Here, the female joint 20 (the portion excluding the female joint convex portion 5B) has a shape (a so-called "half-split" shape) in which the female joint of the above-described prior art (Patent Document 1) is divided into two along the longitudinal center line. ).

図３のＡ４矢視図である図４において、雌継手凹部５Ａの縁部５ＡＡは破線で表示されており、雌継手凸部５Ｂの縁部５ＢＡは実線で表示されている。
図４において、板状の雌継手凸部５Ｂは実線で表示され、雌継手凹部５Ａにおける縁部５ＡＡ以外の２方の縁部（雌継手凸部５Ｂと重なる部分）は破線で表示されている。
雌継手凹部５Ａの縁部５ＡＡ、雌継手凸部５Ｂの縁部５ＢＡはテーパー部を構成しており、当該テーパーは、例えば１／１０である。
図８を参照して後述するが、当該テーパー部により、セグメントに外力が発生した場合でも、雄継手凸部３Ａと雌継手凹部５Ａの係合状態と、雄側凹部３Ｂと雌側凸部５Ｂの係合状態が解除されてしまうことが抑制される。 In FIG. 4, which is a view along arrow A4 in FIG. 3, the edge 5AA of the female joint recess 5A is indicated by a broken line, and the edge 5BA of the female joint protrusion 5B is indicated by a solid line.
In FIG. 4, the plate-shaped female joint protrusion 5B is indicated by a solid line, and the two edges of the female joint recess 5A other than the edge 5AA (the portion overlapping with the female joint protrusion 5B) are indicated by broken lines. .
The edge portion 5AA of the female joint concave portion 5A and the edge portion 5BA of the female joint convex portion 5B constitute a tapered portion, and the taper is, for example, 1/10.
As will be described later with reference to FIG. 8, even when an external force is applied to the segment due to the tapered portion, the engagement state between the male joint convex portion 3A and the female joint concave portion 5A and the male side concave portion 3B and the female side convex portion 5B is restrained from being released from the engaged state.

図示の実施形態において、図５でも示す様に、雌継手２０（雌継手本体部２）は雌側凸部５Ｂが存在するため、鍛造により一体成形することは困難である。図示の実施形態において、雌継手２０を鍛造により製造するためには、雌継手凸部５Ｂのみを単独で製造し、雌継手２０の雌継手凸部５Ｂ以外の部分を鍛造で一体成形する。そして、単独で製造した板状の雌継手凸部５Ｂを雌継手２０のその他の部分に溶接する。図５で示す領域Ｒ５は、溶接する際に、雌継手凸部５Ｂ以外の部分と接続される領域である。領域Ｒ５は、図３において、雌継手先端部５の開口している側（雄継手１０側：テーパー部を形成した縁部５ＢＡ側）とは反対側に位置している。
雌継手凸部５Ｂを雌継手先端部５に溶接した雌継手２０であっても、雄継手１０と係合した際に、雌継手凸部５Ｂを雌継手先端部５から引っ張る力は作用しないので、強度的に問題はない。
ここで、雌継手２０を鋳造で製造することが可能であり、雌継手２０を鋳造により製造した場合には、一体成形が可能であり、複数の部品同士を溶接する必要は無い。 In the illustrated embodiment, as shown in FIG. 5, the female joint 20 (female joint main body 2) has the female-side convex portion 5B, so that it is difficult to integrally form the female joint 20 by forging. In the illustrated embodiment, in order to manufacture the female joint 20 by forging, only the female joint convex portion 5B is manufactured independently, and the portion of the female joint 20 other than the female joint convex portion 5B is integrally formed by forging. Then, the independently manufactured plate-shaped female joint convex portion 5B is welded to the other portion of the female joint 20 . A region R5 shown in FIG. 5 is a region that is connected to a portion other than the female joint convex portion 5B during welding. The region R5 is located on the side opposite to the opening side of the distal end portion 5 of the female joint (the side of the male joint 10: the side of the edge portion 5BA where the tapered portion is formed) in FIG.
Even in the case of the female joint 20 in which the female joint convex portion 5B is welded to the female joint distal end portion 5, no force acts to pull the female joint convex portion 5B from the female joint distal end portion 5 when engaged with the male joint 10. , there is no problem in terms of strength.
Here, the female joint 20 can be manufactured by casting, and when the female joint 20 is manufactured by casting, integral molding is possible, and there is no need to weld a plurality of parts together.

次に図６、図７を参照して、雄継手１０と雌継手２０の係合について説明する。
図６は、雄継手１０を雌継手２０に係合させる直前の状態を示し、雄継手先端部３と、雌継手先端部５の内部空間５Ｓとを対向させて配置している。ここで、図６、図７における上下方向は、セグメント同士を接続した円環状のライナーの接続方向（トンネルの長手方向）であり、図１、図３における上下方向とは異なっている。
図１～図４を参照して上述した通り、雌継手先端部５の内部空間５Ｓと、雄継手先端部３とは相補的な形状である。 Next, the engagement between the male joint 10 and the female joint 20 will be described with reference to FIGS. 6 and 7. FIG.
FIG. 6 shows the state immediately before the male joint 10 is engaged with the female joint 20, in which the male joint distal end portion 3 and the internal space 5S of the female joint distal end portion 5 are arranged to face each other. Here, the vertical direction in FIGS. 6 and 7 is the connecting direction (longitudinal direction of the tunnel) of the ring-shaped liner that connects the segments, and is different from the vertical direction in FIGS.
As described above with reference to FIGS. 1 to 4, the internal space 5S of the female joint tip 5 and the male joint tip 3 have complementary shapes.

図６で示す状態から、雄継手１０を雌継手２０側（図６、図７の下側）へ（相対的に）移動すれば、雄継手先端部３が雌継手先端部５の内部空間５Ｓに係合して、雄継手１０と雌継手２０は係合する。雄継手１０を雌継手２０側に相対的に移動する際に、雄継手凸部３Ａの肩部３ＡＡは雌継手凹部５Ａの縁部５ＡＡに沿って移動或いは摺動し、雄継手凹部３Ｂの肩部３ＢＡは雌継手凸部５Ｂの縁部５ＢＡに沿って移動或いは摺動する。そして、図７で示す状態（雄継手１０と雌継手２０が係合した状態）になる。
図７で示す雄継手１０と雌継手２０が係合した状態を解除するためには、図７において、雄継手１０を雌継手２０に対して（図６、図７の上下方向に）相対的に移動する。係る相対移動により、雄継手先端部３が雌継手先端部５の内部空間５Ｓから係合解除されて、雄継手１０と雌継手２０が係合解除される。 From the state shown in FIG. 6, if the male joint 10 is (relatively) moved toward the female joint 20 side (the lower side of FIGS. 6 and 7), the male joint tip portion 3 is moved to the internal space 5S of the female joint tip portion 5. , the male joint 10 and the female joint 20 are engaged. When the male joint 10 is relatively moved toward the female joint 20, the shoulder 3AA of the male joint projection 3A moves or slides along the edge 5AA of the female joint recess 5A, and the shoulder of the male joint recess 3B moves or slides. The portion 3BA moves or slides along the edge portion 5BA of the female joint convex portion 5B. Then, the state shown in FIG. 7 (the state where the male joint 10 and the female joint 20 are engaged) is reached.
In order to release the engaged state between the male joint 10 and the female joint 20 shown in FIG. move to Due to such relative movement, the male joint distal end portion 3 is disengaged from the internal space 5S of the female joint distal end portion 5, and the male joint 10 and the female joint 20 are disengaged.

次に図８を参照して、雄継手１０と雌継手２０が外力によっては係合解除がされ難い理由を説明する。
図８において、雄継手１０の雄継手先端部３が雌継手２０の雌継手先端部５の内部空間５Ｓに収容され、雄継手１０と雌継手２０は係合している。上述した様に、雌継手凸部５Ｂの縁部５ＢＡと雄継手凹部３Ｂの肩部３ＢＡには、共に、テーパー部（例えば１／１０のテーパー：矢印Ｖ方向のテーパー）が形成されている。雌継手凹部５Ａの縁部５ＡＡ及び雄継手凸部３Ａの肩部３ＡＡにも、テーパー部（例えば１／１０のテーパー：矢印Ｖ方向のテーパー）が形成されている。そして、雄継手１０と雌継手２０が係合した際は、雌継手凸部５Ｂの縁部５ＢＡと雄継手凹部３Ｂの肩部３ＢＡ、雌継手凹部５Ａの縁部５ＡＡと雄継手凸部３Ａの肩部３ＡＡが、それぞれ密接している。 Next, with reference to FIG. 8, the reason why the engagement between the male joint 10 and the female joint 20 is difficult to be released by an external force will be described.
In FIG. 8, the male joint distal end portion 3 of the male joint 10 is accommodated in the internal space 5S of the female joint distal end portion 5 of the female joint 20, and the male joint 10 and the female joint 20 are engaged. As described above, both the edge portion 5BA of the female joint convex portion 5B and the shoulder portion 3BA of the male joint concave portion 3B are formed with tapered portions (for example, a taper of 1/10: a taper in the direction of the arrow V). An edge portion 5AA of the female joint concave portion 5A and a shoulder portion 3AA of the male joint convex portion 3A are also tapered (for example, a taper of 1/10: a taper in the direction of the arrow V). When the male joint 10 and the female joint 20 are engaged with each other, the edge portion 5BA of the female joint convex portion 5B and the shoulder portion 3BA of the male joint concave portion 3B, and the edge portion 5AA of the female joint concave portion 5A and the male joint convex portion 3A The shoulders 3AA are in close contact with each other.

ここで、雄継手１０が埋設されたセグメントと雌継手２０が埋設されたセグメントを接合する場合、例えば雄継手１０が埋設されたセグメントを、雌継手２０が埋設されたセグメントに向かって、例えばジャッキによって押圧して接続する。しかし、ジャッキを外すと、セグメントに作用する重力や地山圧力等の外力により、セグメント同士の接合が解除され、接続されたセグメントが抜け落ちてしまう恐れがある。
それに対して、図示の実施形態では図８に示す様に、前記テーパー部（矢印Ｖ方向）は雄継手１０及び雌継手２０（が埋設されているセグメント）に作用する外力の方向（抜け方向：矢印Ｒ方向）に対して傾斜しているため、雄継手１０と雌継手２０が係合した後、雄継手１０が雌継手２０から抜けてしまうことが抑制される。そのため、一方のセグメントが他方のセグメントから外れることが抑制される。 Here, when joining a segment in which the male joint 10 is embedded and a segment in which the female joint 20 is embedded, for example, the segment in which the male joint 10 is embedded is jacked toward the segment in which the female joint 20 is embedded. Press to connect. However, when the jack is removed, there is a risk that the segments will be disconnected from each other due to external forces acting on the segments, such as gravity and ground pressure, and the connected segments will fall off.
On the other hand, in the illustrated embodiment, as shown in FIG. 8, the tapered portion (direction of arrow V) is in the direction of the external force acting on (segments in which the male and female joints 10 and 20 are embedded) (removal direction: arrow R), it is possible to prevent the male joint 10 from coming off the female joint 20 after the male joint 10 and the female joint 20 are engaged with each other. Therefore, one segment is prevented from coming off the other segment.

図８を参照して上述した様に、雄継手凸部３Ａの肩部３ＡＡと雌継手凹部５Ａの縁部５ＡＡ、雄継手凹部３Ｂの肩部３ＢＡと雌継手凸部５Ｂの縁部５ＢＡには矢印Ｖ方向のテーパーが形成されているため、雌継手先端部５の内部空間５Ｓと雄継手先端部３との係合を解除する際には、矢印Ｖ方向に雄継手１０と雌継手２０を相対移動させなければならない。
換言すれば、雄継手先端部３と雌継手先端部５の内部空間５Ｓを係合した後は、雄継手１０と雌継手２０を矢印Ｖ方向に相対移動しない限り、雄継手１０と雌継手２０は係合解除されない。 As described above with reference to FIG. 8, the shoulder portion 3AA of the male joint convex portion 3A and the edge portion 5AA of the female joint concave portion 5A, the shoulder portion 3BA of the male joint concave portion 3B and the edge portion 5BA of the female joint convex portion 5B have Since the taper is formed in the direction of the arrow V, when releasing the engagement between the internal space 5S of the female joint distal end portion 5 and the male joint distal end portion 3, the male joint 10 and the female joint 20 are separated in the arrow V direction. must be moved relative to each other.
In other words, after the male joint distal end portion 3 and the female joint distal end portion 5 are engaged with each other in the internal space 5S, the male joint 10 and the female joint 20 are separated from each other unless the male joint 10 and the female joint 20 are relatively moved in the arrow V direction. is not disengaged.

そのため、セグメントに作用する重力や地山の圧力等により矢印Ｒ方向に力が作用しても、矢印Ｖ方向の力が作用していないので、雄継手凹部３Ｂの肩部３ＢＡのテーパー部と雌継手凸部５Ｂの縁部５ＢＡのテーパー部も相互に摺動せず、係合解除しない。
そして矢印Ｒ方向の外力は、雄継手凹部３Ｂの肩部３ＢＡのテーパー部と雌継手凸部５Ｂの縁部５ＢＡのテーパー部は互いに圧縮する様に作用し、雄継手１０と雌継手２０の係合解除に対する抵抗となる。 Therefore, even if a force acts in the direction of arrow R due to the gravity acting on the segment, the pressure of the ground, or the like, the force in the direction of arrow V does not act, so the tapered portion of the shoulder portion 3BA of the male joint recessed portion 3B and the female portion of the male joint recessed portion 3B do not. The tapered portions of the edge portions 5BA of the joint convex portion 5B do not slide against each other and do not disengage.
The external force in the direction of arrow R acts so that the tapered portion of the shoulder portion 3BA of the male joint concave portion 3B and the tapered portion of the edge portion 5BA of the female joint convex portion 5B are mutually compressed, and the male joint 10 and the female joint 20 are engaged. It becomes a resistance to uncoupling.

例えば、図８において、雌継手２０を埋設したセグメント（図８では図示せず）が先行して配置、固定され、雌継手２０を埋設したセグメントに雄継手１０を埋設したセグメント（図８では図示せず）が取り付けられる場合であって、雄継手１０を埋設したセグメントに作用する重力が図８の矢印Ｒ方向（図８の上方）に作用する場合を説明する。
その場合、雌継手２０に対して図８の上方に配置した雄継手１０を、矢印ＶＡ方向（矢印Ｖの反対方向）に移動して雌継手２０に接合する。矢印ＶＡ方向は、雄継手凹部３Ｂの肩部３ＢＡのテーパー部の傾斜及び雌継手凸部５Ｂの縁部５ＢＡのテーパー部の傾斜と平行であるため、雄継手１０は雌継手２０に摺動して係合し、図８で示す状態になる。
図８で示す状態で、重力により雄継手１０を埋設したセグメントが矢印Ｒ方向に移動しようとしても（抜け落ちようとしても）、雄継手凹部３Ｂの肩部３ＢＡのテーパー部が雌継手凸部５Ｂの縁部５ＢＡのテーパー部を矢印Ｒ方向に押圧するのみで、雄継手凹部３Ｂの肩部３ＢＡのテーパー部は雌継手凸部５Ｂの縁部５ＢＡのテーパー部に対して相対的に移動（摺動）することは出来ない。 For example, in FIG. 8, the segment in which the female joint 20 is embedded (not shown in FIG. 8) is arranged and fixed first, and the segment in which the female joint 20 is embedded is followed by the segment in which the male joint 10 is embedded (in FIG. not shown) is attached and the gravity acting on the segment in which the male joint 10 is embedded acts in the direction of arrow R in FIG. 8 (upward in FIG. 8).
In that case, the male joint 10 arranged above the female joint 20 in FIG. Since the direction of the arrow VA is parallel to the taper slope of the shoulder portion 3BA of the male joint concave portion 3B and the taper slope of the edge portion 5BA of the female joint convex portion 5B, the male joint 10 slides on the female joint 20. and engages, resulting in the state shown in FIG.
In the state shown in FIG. 8, even if the segment in which the male joint 10 is embedded moves in the direction of the arrow R (even if it tries to fall off) due to gravity, the tapered portion of the shoulder portion 3BA of the male joint concave portion 3B does not become the female joint convex portion 5B. By simply pressing the tapered portion of the edge portion 5BA in the direction of arrow R, the tapered portion of the shoulder portion 3BA of the male joint concave portion 3B moves (sliding) relative to the tapered portion of the edge portion 5BA of the female joint convex portion 5B. ) is not possible.

次に、図８において、雄継手１０を埋設したセグメントが先行して配置、固定され、雄継手１０を埋設したセグメントに雌継手２０を埋設したセグメント取り付けられる場合であって、雄継手１０を埋設したセグメントに作用する重力が図８の矢印Ｒ方向（図８の上方）に作用する場合を説明する。
その場合、雄継手１０に対して図８の下方に配置した雌継手２０を、矢印Ｖ方向に移動して雄継手１０に接合する。矢印Ｖ方向は、雄継手凹部３Ｂの肩部３ＢＡのテーパー部の傾斜及び雌継手凸部５Ｂの縁部５ＢＡのテーパー部の傾斜と平行であるため、雌継手２０は雄継手１０に摺動して係合し、図８で示す状態になる。
図８で示す状態で、重力により雌継手２０を埋設したセグメントが矢印Ｒ方向に移動しようとしても（抜け落ちようとしても）、雌継手２０の先端部５の一部５Ｗが雄継手１０の先端部３と当接しているため、雌継手２０は図８で示す状態から矢印Ｒ方向に移動することは出来ない。
ここで、雌継手先端部５の一部５Ｗは、雌継手先端部５の開放端側に延在する板状部分であって、且つ、雌継手凸部５Ｂと接触している板状部分である。 Next, in FIG. 8, the segment in which the male joint 10 is embedded is arranged and fixed first, and the segment in which the male joint 10 is embedded is attached to the segment in which the female joint 20 is embedded. A case in which the gravity acting on the segments acting on the segments acts in the direction of arrow R in FIG. 8 (upward in FIG. 8) will be described.
In that case, the female joint 20 arranged below the male joint 10 in FIG. Since the direction of arrow V is parallel to the tapered slope of the shoulder portion 3BA of the male joint concave portion 3B and the tapered portion slope of the edge portion 5BA of the female joint convex portion 5B, the female joint 20 slides on the male joint 10. and engages, resulting in the state shown in FIG.
In the state shown in FIG. 8, even if the segment with the female joint 20 embedded therein tries to move in the direction of the arrow R (even if it tries to fall off) due to gravity, a portion 5W of the distal end portion 5 of the female joint 20 does not move to the distal end portion of the male joint 10. 3, the female joint 20 cannot move in the direction of the arrow R from the state shown in FIG.
Here, the part 5W of the female joint distal end portion 5 is a plate-shaped portion that extends toward the open end side of the female joint distal end portion 5 and is in contact with the female joint convex portion 5B. be.

また図８において、雌継手２０を埋設したセグメントが先行して配置、固定され、雌継手２０を埋設したセグメントに雄継手１０を埋設したセグメントが取り付けられる場合であって、雄継手１０を埋設したセグメントに作用する重力が図８の矢印ＲＡ方向（図８の下方）に作用する場合を説明する。
その場合、雌継手２０に対して図８の上方に配置した雄継手１０を、矢印ＶＡ方向に移動して雌継手１０に接合する。矢印ＶＡ方向は、雄継手凹部３Ｂの肩部３ＢＡのテーパー部の傾斜及び雌継手凸部５Ｂの縁部５ＢＡのテーパー部の傾斜と平行であるため、雄継手１０は雌継手２０に摺動して係合し、図８で示す状態になる。
図８で示す状態で、重力により雄継手１０を埋設したセグメントが矢印ＲＡ方向に移動しようとしても（抜け落ちようとしても）、雌継手２０の先端部５の一部５Ｗが雄継手１０の先端部３と当接しているため、雌継手２０は図８で示す状態から矢印ＲＡ方向に移動することは出来ない。 In FIG. 8, the segment in which the female joint 20 is embedded is arranged and fixed first, and the segment in which the male joint 10 is embedded is attached to the segment in which the female joint 20 is embedded. A case where the gravity acting on the segment acts in the direction of arrow RA in FIG. 8 (downward in FIG. 8) will be described.
In that case, the male joint 10 arranged above the female joint 20 in FIG. Since the direction of the arrow VA is parallel to the taper slope of the shoulder portion 3BA of the male joint concave portion 3B and the taper slope of the edge portion 5BA of the female joint convex portion 5B, the male joint 10 slides on the female joint 20. and engages, resulting in the state shown in FIG.
In the state shown in FIG. 8, even if the segment with the male joint 10 embedded therein tries to move in the direction of the arrow RA (even if it tries to fall off) due to gravity, a portion 5W of the distal end portion 5 of the female joint 20 does not 3, the female joint 20 cannot move in the direction of the arrow RA from the state shown in FIG.

さらに図８において、雄継手１０を埋設したセグメントが先行して配置、固定され、雄継手１０を埋設したセグメントに雌継手２０を埋設したセグメントが取り付けられる場合であって、雌継手２０を埋設したセグメントに作用する重力が図８の矢印ＲＡ方向（図８の下方）に作用する場合を説明する。
係る場合においては、雄継手１０に対して図８の上方に配置した雌継手２０を、矢印ＶＡ方向に移動して雄継手１０に接合する。矢印ＶＡ方向は、雄継手凹部３Ｂの肩部３ＢＡのテーパー部の傾斜及び雌継手凸部５Ｂの縁部５ＢＡのテーパー部の傾斜と平行であるため、雌継手２０は雄継手１０に摺動して係合し、図８で示す状態になる。
図８で示す状態で、重力により雌継手２０を埋設したセグメントが矢印ＲＡ方向に移動しようとしても（抜け落ちようとしても）、雌継手凸部５Ｂの縁部５ＢＡのテーパー部が雄継手凹部３Ｂの肩部３ＢＡのテーパー部を矢印ＲＡ方向に押圧するのみで、雌継手凸部５Ｂの縁部５ＢＡのテーパー部は雄継手凹部３Ｂの肩部３ＢＡのテーパー部に対して相対的に移動（摺動）することは出来ない。
このように、雄継手１０と雌継手２０が係合して、雄継手１０を埋設したセグメントと雌継手２０を埋設したセグメントが接続されると、接続した側のセグメントは先行して配置されて固定されているセグメントに対して矢印Ｖ或いは矢印ＶＡ方向に相対移動しない限りは、接続が解除されてしまうことはない。 Furthermore, in FIG. 8, the segment in which the male joint 10 is embedded is arranged and fixed first, and the segment in which the male joint 10 is embedded is attached to the segment in which the female joint 20 is embedded. A case where the gravity acting on the segment acts in the direction of arrow RA in FIG. 8 (downward in FIG. 8) will be described.
In such a case, the female joint 20 arranged above the male joint 10 in FIG. The direction of the arrow VA is parallel to the tapered slope of the shoulder portion 3BA of the male joint concave portion 3B and the tapered portion slope of the edge portion 5BA of the female joint convex portion 5B. and engages, resulting in the state shown in FIG.
In the state shown in FIG. 8, even if the segment with the female joint 20 embedded therein tries to move in the direction of the arrow RA (even if it tries to fall off) due to gravity, the tapered portion of the edge 5BA of the female joint convex portion 5B will not be in contact with the male joint concave portion 3B. Only by pressing the tapered portion of the shoulder portion 3BA in the direction of the arrow RA, the tapered portion of the edge portion 5BA of the female joint convex portion 5B moves (sliding) relative to the tapered portion of the shoulder portion 3BA of the male joint concave portion 3B. ) is not possible.
Thus, when the male joint 10 and the female joint 20 are engaged and the segment in which the male joint 10 is embedded and the segment in which the female joint 20 is embedded are connected, the segment on the connected side is arranged first. As long as the fixed segment does not move in the direction of arrow V or arrow VA, the connection will not be released.

次に、図９を参照して、図示の実施形態に係るセグメント継手１００を埋設したセグメントについて説明する。
図９において、隣接するセグメントＳＧ１とセグメントＳＧ２をトンネル円周方向Ｃに接続するに際して、セグメントＳＧ１には雄継手１０、セグメントＳＧ２には雌継手２０を埋設し、雄継手１０の雄継手先端部３を雌継手２０の先端部５における内部空間５Ｓに挿入することにより、セグメントＳＧ１とセグメントＳＧ２を接続している。
図９では、セグメントＳＧ１とセグメントＳＧ２には、それぞれ、半径方向外方（地山側、矢印Ｏ側）の領域と、セグメントの半径方向内方（ライナーの内部空間側、矢印Ｉ側）の領域に、雄継手１０或いは雌継手２０が埋設されている。すなわち、セグメントＳＧ１、ＳＧ２には、合計２個のセグメント継手が埋設されている。 Next, a segment in which the segment joint 100 according to the illustrated embodiment is embedded will be described with reference to FIG.
In FIG. 9, when connecting the adjacent segments SG1 and SG2 in the tunnel circumferential direction C, the male joint 10 is embedded in the segment SG1 and the female joint 20 is embedded in the segment SG2. is inserted into the internal space 5S at the distal end portion 5 of the female joint 20 to connect the segments SG1 and SG2.
In FIG. 9, segment SG1 and segment SG2 each have a radially outer region (ground side, arrow O side) and a radially inner region (inner space side of the liner, arrow I side). , the male joint 10 or the female joint 20 is embedded. That is, a total of two segment joints are embedded in the segments SG1 and SG2.

図９において、セグメントＳＧ１の半径方向外方（地山側、矢印Ｏ側）の領域に埋設される雄継手１０では、雄継手本体部１の長手方向（図９では左右方向）に対して直交する方向（図９では上下方向）であって、雄継手１０が埋設されるセグメントＳＧ１の半径方向外方（地山側、矢印Ｏ側）に向かって突出して雄継手凸部３Ａを形成している。
そして、セグメントＳＧ２の半径方向外方（地山側、矢印Ｏ側）の領域に埋設されている雌継手２０では、雌継手本体部２の長手方向（図９では左右方向）に対して直交する方向（図９では上下方向）であって、雌継手２０が埋設されるセグメントＳＧ２の半径方向外方（地山側、矢印Ｏ側）に向かって窪んだ雌継手凹部５Ａを形成している。 In FIG. 9, the male joint 10 embedded in the region radially outward (the ground side, the arrow O side) of the segment SG1 is perpendicular to the longitudinal direction of the male joint main body 1 (the lateral direction in FIG. A male joint projection 3A is formed by protruding radially outward (toward the natural ground, toward arrow O) of the segment SG1 in which the male joint 10 is embedded in the direction (vertical direction in FIG. 9).
In the female joint 20 embedded in the region radially outward (on the ground side, on the arrow O side) of the segment SG2, the direction perpendicular to the longitudinal direction of the female joint main body 2 (left-right direction in FIG. 9) A female joint recessed portion 5A is formed which is recessed radially outward (toward the ground, toward the arrow O) of the segment SG2 in which the female joint 20 is embedded (vertical direction in FIG. 9).

一方、セグメントＳＧ１の半径方向内方（ライナーの内部空間側、矢印Ｉ側）の領域に埋設される雄継手１０では、雄継手本体部１の長手方向に対して直交する方向であって、雄継手１０が埋設されるセグメントＳＧ１の半径方向内方（ライナーの内部空間側、矢印Ｉ側）に向かって突出して雄継手凸部３Ａを形成している。
そして、セグメントＳＧ２の半径方向内方（ライナーの内部空間側、矢印Ｉ側）の領域に埋設されている雌継手２０では、雌継手本体部２の長手方向に対して直交する方向であって、雌継手２０が埋設されるセグメントＳＧ２の半径方向内方（ライナーの内部空間側、矢印Ｉ側）に向かって窪んだ雌継手凹部５Ａを形成している。 On the other hand, in the male joint 10 embedded in the region radially inward of the segment SG1 (inner space side of the liner, arrow I side), the direction perpendicular to the longitudinal direction of the male joint main body 1 is A male joint convex portion 3A is formed by protruding radially inward (on the inner space side of the liner, on the arrow I side) of the segment SG1 in which the joint 10 is embedded.
In the female joint 20 embedded in the region radially inward of the segment SG2 (inner space side of the liner, arrow I side), the direction perpendicular to the longitudinal direction of the female joint main body 2 is A female joint recess 5A is formed which is recessed radially inward (toward the inner space of the liner, the arrow I side) of the segment SG2 in which the female joint 20 is embedded.

ここで、セグメントＳＧ１、ＳＧ２に外力（例えば土圧等）が作用した場合に、外力が作用する方向と隣接するセグメント同士の接続面或いは境界の相対的な位置関係により、引張力が作用する場合と圧縮力が作用する場合とがある。換言すると、セグメントの半径方向外方（地山側、矢印Ｏ側）に圧縮力、半径方向内方（ライナー内の空間側、矢印Ｉ側）に引張力が作用する場合があり、或いは、半径方向外方（地山側）に引張力、半径方向内方（ライナー内の空間側）は圧縮力が作用する場合がある。
圧縮力については、セグメントを構成するコンクリートが圧縮力を負荷することが出来るが、コンクリートは引張力に対しては支持しないので、係合した雄継手１０、雌継手２０により、当該引張力を負荷或いは支持する必要がある。
特許文献１に開示された継手では、１組の継手のみをセグメントに埋設して使用することを原則としているため、雄継手或いは雌継手をセグメントの半径方向中央に配置し、大きな耐力を有する大型の継手を使用している。 Here, when an external force (such as earth pressure) acts on the segments SG1 and SG2, a tensile force acts due to the relative positional relationship between the connecting surfaces or boundaries of the adjacent segments and the direction in which the external force acts. and compressive force. In other words, there are cases where a compressive force acts radially outward (the side of the ground, arrow O side) of the segment, and a tensile force acts radially inward (the space side in the liner, the arrow I side), or In some cases, a tensile force acts on the outer side (the side of the ground), and a compressive force acts on the radially inner side (the side of the space inside the liner).
Concerning the compressive force, the concrete constituting the segment can apply the compressive force, but since the concrete does not support the tensile force, the male joint 10 and the female joint 20 engaged with each other can apply the tensile force. or should be supported.
The joint disclosed in Patent Document 1 is based on the principle that only one set of joints is embedded in the segment for use. fittings are used.

それに対して、図示の実施形態においては、図９で示す様に、（トンネル周方向Ｃについて）隣接するセグメントＳＧ１、ＳＧ２の各々の接合面において、雄継手１０及び／又は雌継手２０は、セグメントの接合面（境界）の半径方向内方の領域と半径方向外方の領域にそれぞれ設けられている。
そして、半径方向外方の雄継手凸部３Ａは半径方向外方に突出し、当該凸部３Ａと係合する雌継手凹部５Ａは半径方向外方に向かって窪んでおり、雄継手凸部３Ａと雌継手凹部５Ａが係合する箇所は、雄継手本体部１及び雌継手本体部２の中心軸ＣＬに対して半径方向外方に位置している。そのため、引張力がセグメントＳＧ１、ＳＧ２の半径方向外方の領域に作用した場合に、当該引張力を効果的に支持することが出来る。
一方、半径方向内方の雄継手凸部３Ａは半径方向内方に突出し、当該凸部３Ａと係合する雌継手凹部５Ａは半径方向内方に向かって窪んでおり、雄継手凸部３Ａと雌継手凹部５Ａが係合する箇所は、雄継手本体部１及び雌継手本体部２の中心軸ＣＬよりも半径方向内方となる。そのため、引張力がセグメントＳＧ１、ＳＧ２の半径方向内方の領域に作用した場合に、係合している雄継手１０及び雌継手２０により当該引張力を効果的に支持することが出来る。 On the other hand, in the illustrated embodiment, as shown in FIG. 9, the male joint 10 and/or the female joint 20 are connected to the joint surfaces of the adjacent segments SG1 and SG2 (in the circumferential direction C of the tunnel). are provided in the radially inner region and the radially outer region of the joint surface (boundary) of each.
The radially outward male joint projection 3A protrudes radially outward, and the female joint recess 5A that engages with the projection 3A is recessed radially outward. A portion where the female joint concave portion 5A engages is positioned radially outward with respect to the central axis CL of the male joint main body portion 1 and the female joint main body portion 2 . Therefore, when a tensile force acts on the radially outer regions of the segments SG1 and SG2, the tensile force can be effectively supported.
On the other hand, the radially inner male joint projection 3A protrudes radially inward, and the female joint recess 5A that engages with the projection 3A is recessed radially inward. A portion where the female joint recess 5A engages is radially inward of the central axis CL of the male joint main body 1 and the female joint main body 2. As shown in FIG. Therefore, when a tensile force acts on the radially inner region of the segments SG1 and SG2, the engaged male joint 10 and female joint 20 can effectively support the tensile force.

次に図１０を参照して、図示の実施形態によれば、隣接するセグメントＳＧ１、ＳＧ２の境界に作用するせん断力に対して良好な耐性を有することを説明する。ここで、図示の簡略化のために、図１０では雄継手１０及び雌継手２０を単純化して示している。
図１０（Ｂ）において、従来技術（特許文献１）では、雄継手１０Ａと雌継手２０Ａの嵌合箇所Ｄ（係合箇所）がセグメントＳＧ２内であり、セグメントＳＧ１、ＳＧ２の境界において、雄継手１０Ａのピン状或いは板状の部分１Ａがせん断力を受け持っている。そのため、断面積が小さい部分によってせん断力を支持している。
それに対して図示の実施形態においては、図１０（Ａ）で示す様に、雌継手２０が雄継手１０の側に突出している。より詳細には、図１０（Ａ）においては、雌継手２０を埋設したセグメントＳＧ２の周方向端面から、雌継手先端部５がセグメントＳＧ１側に突出している。そして、セグメントＳＧ１とセグメントＳＧ２を接続した際に、セグメントＳＧ１、ＳＧ２の境界に雌継手先端部５が位置しており、断面積が大きな雌継手先端部５によりセグメントＳＧ１、ＳＧ２の境界に作用するせん断力を支持している。雌継手先端部５の断面積が、従来技術に係る雄継手の部分１Ａよりも大きいことは、図１０（Ａ）と図１０（Ｂ）とを比較すれば明らかである。そのため、セグメントＳＧ１とセグメントＳＧ２の境界において、大きな断面積でせん断力を受け持つ図示の実施形態に係るセグメント継手では、耐せん断力が改善される。
また、従来技術（特許文献１）のセグメント継手は基本的にセグメントの周方向端面に１個だけ埋設する。それに対して、図示の実施形態のセグメント継手１００では、図９で示す様に、隣接するセグメントＳＧ１、ＳＧ２の境界の半径方向内方（セグメント内部空間側）と半径方向外方（地山側）の２箇所に継手（雄継手１０、雌継手２０）を埋設している。そのため、耐せん断性能が向上している。 Referring now to FIG. 10, it will be explained that the illustrated embodiment has good resistance to shear forces acting on the boundaries of adjacent segments SG1, SG2. Here, for simplification of illustration, FIG. 10 shows the male joint 10 and the female joint 20 in a simplified manner.
In FIG. 10B, in the prior art (Patent Document 1), the fitting point D (engagement point) of the male joint 10A and the female joint 20A is within the segment SG2, and the male joint A pin-like or plate-like portion 1A of 10A bears the shearing force. Therefore, the portion with a small cross-sectional area supports the shearing force.
On the other hand, in the illustrated embodiment, the female joint 20 protrudes toward the male joint 10 as shown in FIG. 10(A). More specifically, in FIG. 10A, the female joint distal end portion 5 protrudes toward the segment SG1 from the circumferential end face of the segment SG2 in which the female joint 20 is embedded. When the segment SG1 and the segment SG2 are connected, the female joint tip portion 5 is positioned at the boundary between the segments SG1 and SG2, and the female joint tip portion 5 having a large cross-sectional area acts on the boundary between the segments SG1 and SG2. It supports shear forces. Comparing FIGS. 10(A) and 10(B), it is clear that the cross-sectional area of the female joint distal end portion 5 is larger than that of the conventional male joint portion 1A. Therefore, the segment joint according to the illustrated embodiment, in which shear force is borne by a large cross-sectional area at the boundary between segment SG1 and segment SG2, has improved shear resistance.
Further, in the prior art (Patent Document 1), basically only one segment joint is embedded in the circumferential end face of the segment. On the other hand, in the segment joint 100 of the illustrated embodiment, as shown in FIG. Joints (a male joint 10 and a female joint 20) are embedded at two locations. Therefore, the shear resistance performance is improved.

図示の実施形態によれば、雄継手本体部１の長手方向（図１では左右方向）に対して直交する方向（図１では上下方向）の上方だけが突出して雄継手凸部３Ａを形成し、雌継手先端部５における内部空間５Ｓの雌継手本体部２の長手方向（図３では左右方向）に対して直交する方向（図３では上下方向）の上方のみが窪んで雌継手凹部５Ａを形成しており、雄継手１０は従来技術（特許文献１）の雄継手を長手方向中心線で２分割した様な形状（いわゆる「半割」形状）となっており、雌継手は従来技術（特許文献１）の雌継手を長手方向中心線で２分割した様な形状（いわゆる「半割」形状）となっている。
従来技術（特許文献１）に係る継手の半割形状とした結果、図示の実施形態に係る雄継手及び雌継手における凹凸が少なくなり、形状が簡便化され、製造に係る労力、コストを節減することが出来て、小型軽量化が実現される。
雄継手１０と雌継手２０の接続（係合）に際しては、雌継手先端部５の内部空間５Ｓにおける雌継手凹部５Ａに雄継手先端部３の雄継手凸部３Ａを挿入することにより、雄継手凸部３Ａが雌継手凹部５Ａに係合され、雄継手１０が埋設されたセグメントＳＧと雌継手２０が埋設されたセグメントＳＧを容易に（いわゆる「ワンタッチ」で）接続することが出来る。 According to the illustrated embodiment, only the upper part of the male joint main body 1 protrudes in a direction perpendicular to the longitudinal direction (horizontal direction in FIG. 1) (vertical direction in FIG. 1) to form the male joint projection 3A. Only the upper part of the internal space 5S of the female joint distal end portion 5 in the direction perpendicular to the longitudinal direction (horizontal direction in FIG. 3) of the female joint main body 2 (vertical direction in FIG. 3) is recessed to form the female joint concave portion 5A. The male joint 10 has a shape (a so-called "half-split" shape) in which the male joint of the prior art (Patent Document 1) is divided along the longitudinal center line, and the female joint has the shape of the prior art ( It has a shape (a so-called "half-split" shape) as if the female joint of Patent Document 1) was split in two along the longitudinal center line.
As a result of the halved shape of the joint according to the prior art (Patent Document 1), the male and female joints according to the illustrated embodiment have less unevenness, the shape is simplified, and the labor and cost involved in manufacturing are reduced. As a result, the size and weight can be reduced.
When connecting (engaging) the male joint 10 and the female joint 20, the male joint convex portion 3A of the male joint distal end portion 3 is inserted into the female joint concave portion 5A in the internal space 5S of the female joint distal end portion 5. The convex portion 3A is engaged with the female joint concave portion 5A, and the segment SG in which the male joint 10 is embedded and the segment SG in which the female joint 20 is embedded can be easily connected (so-called "one-touch").

また、図示の実施形態のセグメント継手１００或いはセグメントＳＧにおいて、（トンネル周方向Ｃに）隣接するセグメントＳＧ１、ＳＧ２（図９）の各々の接合面において、雄継手１０及び／又は雌継手２０は半径方向内方の領域と半径方向外方の領域にそれぞれ設けられており、雄継手１０の雄継手凸部３Ａが突出している方向と、当該雄継手凸部３Ａと係合する雌継手２０の雌継手凹部５Ａが形成されている方向は、半径方向内方の領域と半径方向外方の領域で相違させている。
そのため、セグメントＳＧに外力（例えば土圧等）が作用した場合に、外力が作用する方向と隣接するセグメント同士の接続面或いは境界の相対的な位置関係により、引張力が作用する場合と圧縮力が作用する場合が生じても、どのような場合においても外力により発生する引張力等を効果的に支持することが出来る。 Further, in the segment joint 100 or segment SG of the illustrated embodiment, the male joint 10 and/or the female joint 20 are radially Provided in a direction inner region and a radially outer region, respectively, the direction in which the male joint convex portion 3A of the male joint 10 protrudes and the female joint 20 that engages with the male joint convex portion 3A. The direction in which the joint concave portion 5A is formed is different between the radially inner region and the radially outer region.
Therefore, when an external force (for example, earth pressure) acts on the segment SG, depending on the direction in which the external force acts and the relative positional relationship between the connecting surfaces or boundaries of the adjacent segments, the tensile force acts and the compressive force In any case, it can effectively support the tensile force and the like generated by the external force.

図示の実施形態では、半径方向外方の雄継手凸部３Ａが半径方向外方に突出し、当該凸部３Ａと係合する雌継手凹部５Ａが半径方向外方に向かって窪んでいるので、雄継手凸部３Ａと雌継手凹部５Ａが係合する箇所（雄継手凸部３Ａの肩部３ＡＡと雌継手凹部５Ａの縁部５ＡＡ）は、雄継手本体部１及び雌継手本体部２の中心軸ＣＬよりも半径方向外方となり、引張力が半径方向外方の領域に作用した場合に、効率的に支持することが出来る。
一方、半径方向内方の雄継手凸部３Ａが半径方向内方に突出し、当該凸部３Ａと係合する雌継手凹部５Ａは半径方向内方に向かって窪んでいるので、雄継手凸部３Ａと雌継手凹部５Ａが係合する箇所（雄継手凸部３Ａの肩部３ＡＡと雌継手凹部５Ａの縁部５ＡＡ）は、雄継手本体部１及び雌継手本体部２の中心軸ＣＬよりも半径方向内方となり、引張力が半径方向内方の領域に作用した場合に、効率的に支持することが出来る。 In the illustrated embodiment, the radially outward male joint protrusion 3A protrudes radially outward, and the female joint recess 5A that engages with the protrusion 3A is recessed radially outward. The points where the joint convex portion 3A and the female joint concave portion 5A engage (the shoulder portion 3AA of the male joint convex portion 3A and the edge portion 5AA of the female joint concave portion 5A) are the central axes of the male joint main body portion 1 and the female joint main body portion 2. It is radially outward from CL, and can be efficiently supported when a tensile force acts on the radially outward region.
On the other hand, the radially inner male joint protrusion 3A protrudes radially inward, and the female joint recess 5A engaged with the protrusion 3A is recessed radially inward. and female joint concave portion 5A (shoulder portion 3AA of male joint convex portion 3A and edge portion 5AA of female joint concave portion 5A) have a radius larger than central axis CL of male joint body portion 1 and female joint body portion 2. It becomes direction inward, and when a tensile force acts on the area|region of radial direction inner, it can support efficiently.

さらに、図示の実施形態によれば、雄継手先端部３及び雌継手先端部５の内部空間５Ｓの係合箇所であって、雄継手凸部３Ａの肩部３ＡＡと雌継手凹部５Ａの縁部５ＡＡ及び雄継手凹部３Ｂの肩部３ＢＡと雌継手凸部５Ｂの縁部５ＢＡにはテーパー部（図１、図３、図８の矢印Ｖ方向のテーパー）が形成されており、当該テーパー部はセグメントＳＧに作用する外力の方向（抜け方向：図８の矢印Ｒ方向）に対して傾斜している（図８の矢印Ｖ方向）。
そのため、セグメントＳＧの自重等の外力がセグメントＳＧ及びセグメント継手１００に作用しても、前記テーパー部の傾斜が雄継手１０、雌継手２０を埋設したセグメントＳＧの自重が作用する方向（抜け方向Ｒ）に対して傾斜しているため、外力の作用する方向が、雄継手１０及び雌継手２０におけるテーパー部の傾斜方向と相違する。そのため、当該外力は雄継手凹部３Ｂの肩部３ＢＡのテーパー部と雌継手凸部５Ｂの縁部５ＢＡのテーパー部が互いに圧縮しあう方向に作用して、テーパー部同士が摺動、相互移動して雄継手１０と雌継手２０が相対移動することはなく、雄継手１０と雌継手２０は係合解除せず、セグメントＳＧが抜け落ちてしまうことが防止される。
或いは、雌継手先端５の部分５Ｗが雄継手先端３と当接することにより、雄継手１０を埋設したセグメントと雌継手２０を埋設したセグメントが、重力により矢印Ｒ或いは矢印ＲＡに相対移動することが防止される。 Furthermore, according to the illustrated embodiment, the engaging portion of the internal space 5S of the male joint distal end portion 3 and the female joint distal end portion 5, which is the shoulder portion 3AA of the male joint convex portion 3A and the edge portion of the female joint concave portion 5A. A tapered portion (a taper in the direction of the arrow V in FIGS. 1, 3, and 8) is formed in 5AA and the shoulder portion 3BA of the male joint concave portion 3B and the edge portion 5BA of the female joint convex portion 5B. It is inclined (in the direction of arrow V in FIG. 8) with respect to the direction of the external force acting on segment SG (the direction of removal: the direction of arrow R in FIG. 8).
Therefore, even if an external force such as the weight of the segment SG acts on the segment SG and the segment joint 100, the inclination of the tapered portion is in the direction in which the weight of the segment SG in which the male joint 10 and the female joint 20 are embedded acts (removal direction R ), the direction in which the external force acts is different from the direction of inclination of the tapered portions of the male joint 10 and the female joint 20 . Therefore, the external force acts in a direction in which the tapered portion of the shoulder portion 3BA of the male joint concave portion 3B and the tapered portion of the edge portion 5BA of the female joint convex portion 5B are mutually compressed, and the tapered portions slide and move relative to each other. Thus, the male joint 10 and the female joint 20 do not move relative to each other, the engagement between the male joint 10 and the female joint 20 is not released, and the segment SG is prevented from coming off.
Alternatively, when the portion 5W of the distal end 5 of the female joint abuts against the distal end 3 of the male joint, the segment in which the male joint 10 is embedded and the segment in which the female joint 20 is embedded may relatively move in the direction of arrow R or RA due to gravity. prevented.

また、図示の実施形態によれば、雌継手２０を埋設したセグメントＳＧの周方向端面から雌継手先端部５が雄継手１０を埋設したセグメントＳＧ側に突出しており、セグメントＳＧを接続した際に隣接するセグメントＳＧとの境界に雄継手先端部３と係合した雌継手先端部５が位置し、雌継手先端部５の断面積は継手本体部１、２の断面積に比較して大きく設定されている。そのため、隣接するセグメントＳＧの境界に作用するせん断力を大きな断面積で受け持つことにより、耐せん断力性能が向上する。
従来技術（特許文献１）の様に断面積が小さい雄継手の本体部がセグメントの境界に位置してせん断力を支持している構造に比較して、同一の素材であれば、図示の実施形態に係るセグメント継手の方が耐せん断力性能は改善される。 Further, according to the illustrated embodiment, the female joint distal end portion 5 protrudes from the circumferential end face of the segment SG in which the female joint 20 is embedded toward the segment SG in which the male joint 10 is embedded, so that when the segment SG is connected, A female joint distal end portion 5 engaged with a male joint distal end portion 3 is positioned at the boundary with the adjacent segment SG, and the cross-sectional area of the female joint distal end portion 5 is set larger than the cross-sectional areas of the joint main bodies 1 and 2. It is Therefore, shear force resistance performance is improved by bearing the shear force acting on the boundaries of the adjacent segments SG with a large cross-sectional area.
Compared to the conventional technology (Patent Document 1) in which the main body of the male joint with a small cross-sectional area is positioned at the boundary of the segment to support the shearing force, if the material is the same, the illustrated implementation The segment joint according to the form has improved shear force resistance performance.

図示の実施形態はあくまでも例示であり、本発明の技術的範囲を限定する趣旨の記述ではないことを付記する。
例えば、図示の実施形態においては、雄継手凹部３Ｂの肩部３ＢＡと雌継手凸部５Ｂの縁部５ＢＡのみにテーパー部を形成しても良い。或いは、テーパー部の方向を、図８の矢印Ｖ方向と異なり、図８で上方に行くほど矢印Ｒの方向から左側にそれる方向（Ｖ方向と矢印Ｒの方向に対して線対称な方向）とした上で、雄継手凸部３Ａの肩部３ＡＡと雌継手凹部５Ａの縁部５ＡＡのみにテーパー部を形成しても良い。
また、図示の実施形態においては、雄継手１０、雌継手２０のそれぞれのアンカー部４、６を板状部材で構成したが、棒状部材（例えば異形棒鋼やボルト）によりアンカー部４、６を構成して、雄継手本体部１、雌継手本体部２に固定することも可能である。 It should be noted that the illustrated embodiment is merely an example and is not intended to limit the technical scope of the present invention.
For example, in the illustrated embodiment, only the shoulder portion 3BA of the male joint concave portion 3B and the edge portion 5BA of the female joint convex portion 5B may be tapered. Alternatively, the direction of the tapered portion is different from the direction of the arrow V in FIG. 8, and diverges leftward from the direction of the arrow R as it goes upward in FIG. In addition, the tapered portions may be formed only at the shoulder portion 3AA of the male joint convex portion 3A and the edge portion 5AA of the female joint concave portion 5A.
In the illustrated embodiment, the anchor portions 4 and 6 of the male joint 10 and the female joint 20 are formed of plate-like members, but the anchor portions 4 and 6 are formed of bar-like members (for example, deformed bar steel or bolts). It is also possible to fix to the male joint main body portion 1 and the female joint main body portion 2 by doing so.

１・・・雄継手本体部
２・・・雌継手本体部
３・・・雄継手先端部
３Ａ・・・雄継手凸部
３ＡＡ・・・肩部
３Ｂ・・・雄継手凹部
３ＢＡ・・・肩部
４・・・雄継手アンカー部
５・・・雌継手先端部
５Ａ・・・雌継手凹部
５ＡＡ・・・縁部
５Ｂ・・・雌継手凸部
５ＢＡ・・・縁部
５Ｓ・・・内部空間
６・・・雌継手アンカー部
１０・・・雄継手
２０・・・雌継手
１００・・・セグメント継手
ＳＧ・・・セグメント Reference Signs List 1 Male joint main body 2 Female joint main body 3 Male joint tip 3A Male joint convex 3AA Shoulder 3B Male joint concave 3BA Shoulder Part 4 Male joint anchor part 5 Female joint tip part 5A Female joint concave part 5AA... Edge part 5B Female joint convex part 5BA... Edge part 5S... Internal space 6 Female joint anchor part 10 Male joint 20 Female joint 100 Segment joint SG Segment

Claims

Consists of a male joint and a female joint,
The male joint has a male joint main body portion, the male joint main body portion has a male joint tip portion that engages with the female joint and a male joint anchor portion that is provided at the opposite end portion and is embedded in the segment,
The tip of the male joint protrudes in one of the directions perpendicular to the longitudinal direction of the main body of the male joint to form a male joint projection, and the other is recessed to form a male joint recess. The male joint anchor side edge of the male joint recess forms a shoulder,
The female joint has a female joint body portion, and the female joint body portion has a female joint tip portion that engages with the male joint and a female joint anchor portion that is provided at the opposite end portion and is embedded in the segment. ,
The distal end portion of the female joint has an internal space having a shape complementary to that of the distal end portion of the male joint, and one of the directions perpendicular to the longitudinal direction of the body portion of the female joint in the internal space is recessed to form a female joint concave portion. A protruding female joint protrusion is formed on the other side, and the edge of the female joint protrusion on the side remote from the female joint anchor has a shape complementary to the shoulder of the male joint recess. A segment joint, wherein the edge on the side remote from the female joint anchor portion has a shape complementary to the shoulder portion of the male joint convex portion.

the male and female joints are embedded in radially outward regions of the segments;
A male joint projecting portion is formed by protruding outward in a radial direction of a segment in which the male joint is embedded in a direction perpendicular to the longitudinal direction of the male joint main body,
2. A segment joint according to claim 1, wherein the female joint recess is formed by recessing radially outward of the segment in which the female joint is embedded in a direction perpendicular to the longitudinal direction of the female joint main body.

the male and female joints are embedded in the radially inner region of the segment;
A male joint projection is formed by protruding radially inward of a segment in which the male joint is embedded in a direction perpendicular to the longitudinal direction of the male joint main body,
3. The segment according to claim 1, wherein the female joint recess is formed by recessing radially inward of the segment in which the female joint is embedded in a direction perpendicular to the longitudinal direction of the female joint main body. fittings.

A shoulder portion of the concave portion of the male joint and an edge portion of the convex portion of the female joint on the side away from the anchor portion of the female joint form a tapered portion. The segment joint according to any one of claims 1 to 3, which is inclined.

The segment joint according to any one of claims 1 to 4 is embedded in the circumferential end surface,
The tip of the female joint protrudes from the circumferential end face of the segment in which the female joint is embedded, and when the segments are connected, the tip of the female joint engaged with the tip of the male joint is positioned on the boundary between adjacent segments. segment.