JP6835162B2

JP6835162B2 - Sheet pile

Info

Publication number: JP6835162B2
Application number: JP2019150219A
Authority: JP
Inventors: 恩田　邦彦; 邦彦恩田; 正嗣道野
Original assignee: JFE Steel Corp
Current assignee: JFE Steel Corp
Priority date: 2019-08-20
Filing date: 2019-08-20
Publication date: 2021-02-24
Anticipated expiration: 2037-02-27
Also published as: JP2019194440A

Description

本発明は、板状素材をロール成形をはじめとする成形加工することにより形成され地中に打設されて壁構造を構成する矢板に関する。
なお、板状素材としては鋼材の他、プラスチック系材料や炭素繊維系材料を含む。 The present invention relates to a sheet pile which is formed by molding a plate-shaped material such as roll molding and is cast into the ground to form a wall structure.
In addition to steel, the plate-shaped material includes plastic-based materials and carbon fiber-based materials.

従来の矢板としては、前面側から後面側に向かって膨出する主体部の両側にフランジ部が設けられ、一方のフランジ部の遊端に雄側継手部が形成され、他方のフランジ部に雌側継手部が形成されたものが知られている。このような矢板は、隣接する矢板との連結にあたって雄側継手部と雌側継手部とが打設途中で外れないことが求められる。 As a conventional sheet pile, flanges are provided on both sides of a main body that bulges from the front side to the rear side, a male side joint is formed at the free end of one flange, and a female is formed on the other flange. It is known that a side joint portion is formed. In such a sheet pile, it is required that the male side joint portion and the female side joint portion do not come off during the driving when connecting to the adjacent sheet pile.

上記のような矢板の例としては、特許文献１に開示された「軽量鋼矢板」があり、この特許文献１の例では、雄側継手部は、第１のフランジ部の遊端から後面側に横向きＵ字状に折り返され、雌側継手部は、第２のフランジ部の遊端から後面側に突出する延長部の後端側から前面側に横向きＵ字状に折り返されている。第１のフランジ部には、雄側継手部が他の矢板の雌側継手部に連結した状態で、雌側継手部のＵ字状の折り返し部に当接する突部が形成されている。 An example of the sheet pile as described above is the "lightweight steel sheet pile" disclosed in Patent Document 1. In the example of Patent Document 1, the male side joint portion is from the free end to the rear surface side of the first flange portion. The female side joint portion is folded back in a lateral U shape from the rear end side of the extension portion protruding from the free end of the second flange portion to the rear surface side to the front surface side. The first flange portion is formed with a protrusion that abuts on the U-shaped folded portion of the female side joint portion in a state where the male side joint portion is connected to the female side joint portion of another sheet pile.

実開平４−１０８６１９号公報Jikkenhei 4-108619

ハット形状の矢板を地中に打設して壁構造を構成する際、壁体には土圧および水圧によって発生する曲げモーメントが卓越して作用する。
この時の作用を図１３に基づいて説明する。図１３は、ウェブ部８１の両端に一対のフランジ部８３が連続して形成され、各フランジ部８３の端部に第１のアーム部８５、第２のアーム部８７がそれぞれ形成されるとともに、第１のアーム部８５の先端に雄側継手部８９が設けられ、第２のアーム部８７の先端に雌側継手部９１が設けられたハット形状の矢板９３である。 When a hat-shaped sheet pile is placed in the ground to form a wall structure, the bending moment generated by earth pressure and water pressure acts predominantly on the wall body.
The operation at this time will be described with reference to FIG. In FIG. 13, a pair of flange portions 83 are continuously formed at both ends of the web portion 81, and a first arm portion 85 and a second arm portion 87 are formed at the ends of the flange portions 83, respectively. It is a hat-shaped sheet pile 93 in which a male side joint portion 89 is provided at the tip of the first arm portion 85 and a female side joint portion 91 is provided at the tip of the second arm portion 87.

土圧および水圧によって発生する曲げモーメントが作用した際、継手部の嵌合力が弱いと、図１３に示す破線の元の状態から実線の状態のように、継手部を含む第１のアーム部８５及び第２のアーム部８７が矢板断面中心軸方向に反りかえるとともに、横方向に広がる挙動を示す。
この断面変形により、矢板９３の断面二次モーメントや断面係数が元の断面形状に比べて小さくなることから、矢板壁体としての剛性や耐力が低下することとなる。 When the fitting force of the joint portion is weak when the bending moment generated by earth pressure and water pressure is applied, the first arm portion 85 including the joint portion is shown from the original state of the broken line to the solid line state shown in FIG. And the second arm portion 87 bends in the direction of the central axis of the sheet pile cross section and exhibits a behavior of spreading in the lateral direction.
Due to this cross-sectional deformation, the moment of inertia of area and the cross-sectional coefficient of the sheet pile 93 become smaller than the original cross-sectional shape, so that the rigidity and strength of the sheet pile wall body are lowered.

図１４は、図１３の継手部の嵌合状態を示しており、図１４（ａ）が上記の断面変形が生ずる前の状態（図１３の破線の状態）を示し、図１４（ｂ）は上記の断面変形後の状態（図１３の実線の状態）を示している。
断面変形が生ずることで、図１４（ｂ）に示すように、両継手部は互いに押し合う状態になり、このとき両継手部は１点のみの接触となる。このため両継手部に対する作用力が１か所に集中し（図１４（ｂ）の破線の丸で囲った部分）、継手部が早期に破壊してしまうリスクが高くなるとともに、矢板９３の断面変形も進行し、矢板壁体としての剛性や耐力の低下が大きくなる危険性がある。 FIG. 14 shows the fitting state of the joint portion of FIG. 13, FIG. 14 (a) shows the state before the above-mentioned cross-sectional deformation occurs (the state of the broken line in FIG. 13), and FIG. 14 (b) shows the state. The state after the cross-sectional deformation (the state of the solid line in FIG. 13) is shown.
As the cross-sectional deformation occurs, as shown in FIG. 14B, both joints are in a state of being pressed against each other, and at this time, both joints are in contact with only one point. For this reason, the proof stress on both joints is concentrated in one place (the part circled by the broken line in FIG. 14B), which increases the risk of the joints breaking at an early stage and the cross section of the sheet pile 93. Deformation also progresses, and there is a risk that the rigidity and proof stress of the sheet pile wall will decrease significantly.

本発明はかかる課題を解決するためになされたものであり、矢板の継手部を連結して形成した矢板壁体に曲げモーメントが作用した際に、矢板に断面変形が生じて剛性や耐力が低下することを抑制できる矢板を提供することを目的としている。 The present invention has been made to solve such a problem, and when a bending moment acts on a sheet pile wall body formed by connecting joints of sheet piles, the sheet pile is deformed in cross section to reduce rigidity and proof stress. The purpose is to provide a sheet pile that can suppress this.

（１）本発明に係る矢板は、ウェブ部の両端に一対のフランジ部が連続して形成され、各フランジ部の端部に第１のアーム部、第２のアーム部がそれぞれ形成されるとともに、前記第１のアーム部の先端に雄側継手部が設けられ、前記第２のアーム部の先端に雌側継手部が設けられたハット形状の矢板、又は、ウェブ部の両端の一方には第１のアーム部が他方には第２のアーム部がそれぞれ形成され、前記第１のアーム部の先端に雄側継手部が設けられ、前記第２のアーム部の先端に雌側継手部が設けられたＺ形状の矢板において、
前記雄側継手部は、前記第１のアーム部の遊端から後面側に湾曲する第１湾曲部と、該第１湾曲部に連続して折り返されたＵ字状の第２湾曲部と、該第２湾曲部に連続して前記第１のアーム部に向かって前記第１湾曲部の延長部とほぼ平行に直線状に延出する第１引掛部とを有し、
前記雌側継手部は、前記第２のアーム部の遊端から後面側に湾曲した第３湾曲部と、該第３湾曲部に連続して前面側に向かって湾曲する第４湾曲部と、該第４湾曲部に連続して前記雄側継手部の第１引掛部とほぼ平行になる方向に向かって折り返されたＵ字状の第５湾曲部と、該第５湾曲部に連続して前記雄側継手部の第１引掛部とほぼ平行に直線状に延出する第２引掛部とを有し、
前記雄側継手部の前記第２湾曲部の最外縁位置から前記第１引掛部の端部位置までの長さＳ１が、前記雌側継手部の前記第４湾曲部における湾曲内側の最も奥の位置から前記第２引掛部の端部位置までの長さＵ１よりも長くなるように設定されていることを特徴とするものである。 (1) In the sheet pile according to the present invention, a pair of flange portions are continuously formed at both ends of the web portion, and a first arm portion and a second arm portion are formed at the ends of the flange portions, respectively. A hat-shaped sheet pile provided with a male joint at the tip of the first arm and a female joint at the tip of the second arm, or one of both ends of the web. A second arm portion is formed on the other side of the first arm portion, a male side joint portion is provided at the tip of the first arm portion, and a female side joint portion is formed at the tip of the second arm portion. In the provided Z-shaped sheet pile,
The male side joint portion includes a first curved portion that curves from the free end of the first arm portion to the rear surface side, and a U-shaped second curved portion that is continuously folded back to the first curved portion. The second curved portion has a first hook portion that extends linearly toward the first arm portion in a line substantially parallel to the extension portion of the first curved portion.
The female side joint portion includes a third curved portion curved from the free end of the second arm portion to the rear surface side, and a fourth curved portion continuously curved toward the front surface side of the third curved portion. A U-shaped fifth curved portion that is continuous with the fourth curved portion and folded back in a direction substantially parallel to the first hooking portion of the male side joint portion, and continuous with the fifth curved portion. It has a second hook portion that extends linearly in parallel with the first hook portion of the male side joint portion.
The length S1 from the outermost edge position of the second curved portion of the male side joint portion to the end position of the first hook portion is the innermost part of the curved inner side of the fourth curved portion of the female joint portion. It is characterized in that the length from the position to the end position of the second hooking portion is set to be longer than the length U1.

（２）本発明に係る矢板は、ウェブ部の両端に一対のフランジ部が連続して形成され、各フランジ部の端部に第１のアーム部、第２のアーム部がそれぞれ形成されるとともに、前記第１のアーム部の先端に雄側継手部が設けられ、前記第２のアーム部の先端に雌側継手部が設けられたハット形状の矢板、又は、ウェブ部の両端の一方には第１のアーム部が他方には第２のアーム部がそれぞれ形成され、前記第１のアーム部の先端に雄側継手部が設けられ、前記第２のアーム部の先端に雌側継手部が設けられたＺ形状の矢板において、
前記雄側継手部は、前記第１のアーム部の遊端から後面側に湾曲する第１湾曲部と、続いて前面側に折り返される第２湾曲部と、該第２湾曲部の延長部に連続して折り返されたＵ字状の第３湾曲部と、該第３湾曲部に連続して前記第２湾曲部の延長部とほぼ平行に直線状に延出する第１引掛部とを有し、
前記雌側継手部は、前記第２のアーム部の遊端から後面側に湾曲した第４湾曲部と、該第４湾曲部に連続して後面側斜め方向に湾曲する第５湾曲部と、該第５湾曲部に連続して前記雄側継手部の第１引掛部とほぼ平行になる方向に向かって折り返されたＵ字状の第６湾曲部と、前記第６湾曲部に連続して前記雄側継手部の第１引掛部とほぼ平行に直線状に延出する第２引掛部とを有し、
前記雄側継手部の前記第２湾曲部の最外縁位置から前記第１のアーム部下端位置までの長さＳ３が、前記雄側継手部の第１引掛部の先端位置から前記第１のアーム部下端位置までの長さＳ２の0.5倍を越えると共に前記雄側継手部の前記第３湾曲部の最外縁位置から、前記第１引掛部の先端位置までの長さＳ４が、前記雌側継手部の前記第２引掛部の先端と前記第４湾曲部の内面で形成される開口部幅Ｕ２を越えることを特徴とするものである。 (2) In the sheet pile according to the present invention, a pair of flange portions are continuously formed at both ends of the web portion, and a first arm portion and a second arm portion are formed at the ends of the flange portions, respectively. A hat-shaped sheet pile provided with a male joint at the tip of the first arm and a female joint at the tip of the second arm, or one of both ends of the web. A second arm portion is formed on the other side of the first arm portion, a male side joint portion is provided at the tip of the first arm portion, and a female side joint portion is formed at the tip of the second arm portion. In the provided Z-shaped sheet pile,
The male side joint portion is formed on a first curved portion that curves from the free end of the first arm portion to the rear surface side, a second curved portion that is subsequently folded back to the front side, and an extension portion of the second curved portion. It has a U-shaped third curved portion that is continuously folded back, and a first hook portion that extends continuously to the third curved portion in a straight line substantially parallel to the extension portion of the second curved portion. And
The female side joint portion includes a fourth curved portion that is curved from the free end of the second arm portion to the rear surface side, and a fifth curved portion that is continuous with the fourth curved portion and is curved in the rear surface side oblique direction. A U-shaped sixth curved portion that is continuous with the fifth curved portion and folded back in a direction substantially parallel to the first hook portion of the male side joint portion, and continuous with the sixth curved portion. It has a second hooking portion that extends linearly in parallel with the first hooking portion of the male side joint portion.
The length S3 from the outermost edge position of the second curved portion of the male side joint portion to the lower end position of the first arm portion is from the tip position of the first hook portion of the male side joint portion to the first arm. The length S4 from the outermost edge position of the third curved portion of the male side joint portion to the tip position of the first hook portion is more than 0.5 times the length S2 to the lower end position of the portion and is the female side joint. It is characterized in that it exceeds the opening width U2 formed on the tip of the second hook portion of the portion and the inner surface of the fourth curved portion.

（３）本発明に係る矢板は、ウェブ部の両端に一対のフランジ部が連続して形成され、各フランジ部の端部に第１のアーム部、第２のアーム部がそれぞれ形成されるとともに、前記第１のアーム部の先端に雄側継手部が設けられ、前記第２のアーム部の先端に雌側継手部が設けられたハット形状の矢板、又は、ウェブ部の両端の一方には第１のアーム部が他方には第２のアーム部がそれぞれ形成され、前記第１のアーム部の先端に雄側継手部が設けられ、前記第２のアーム部の先端に雌側継手部が設けられたＺ形状の矢板において、
前記雄側継手部は、前記第１のアーム部の遊端から後面側に湾曲する第１湾曲部と、続いて前面側に折り返される第２湾曲部と、続いて前記第１のアーム部の延長方向になるように折り返される第３湾曲部と、その先に折り返されたＵ字状の第４湾曲部と、該第４湾曲部からほぼ直線状に前記第１のアーム部とほぼ平行になる方向に延出する第１引掛部とを有し、
前記雌側継手部は、前記第２のアーム部の遊端から後面側に湾曲した第５湾曲部と、該第５湾曲部に連続して前記第２のアーム部と平行となる方向に湾曲する第６湾曲部と、該第６湾曲部に連続して前記第２のアーム部と平行になる方向に向かって折り返されたＵ字状の第７湾曲部と、前記第７湾曲部に連続して前記第２のアーム部とほぼ平行に直線状に延出する第２引掛部とを有し、
前記雄側継手部の前記第２湾曲部の最外縁位置から前記第１のアーム部下端位置までの長さＳ６が、前記雄側継手部の第１引掛部の先端位置から前記第１のアーム部下端位置までの鉛直方向長さＳ５の２/３倍を越えるとともに、前記雄側継手部の前記第４湾曲部の最外縁位置から第１引掛部の先端位置までの長さＳ７が、前記雌側継手部の前記第２引掛部の先端と前記第５湾曲部の内面で形成される開口部幅Ｕ３を越えることを特徴とするものである。 (3) In the sheet pile according to the present invention, a pair of flange portions are continuously formed at both ends of the web portion, and a first arm portion and a second arm portion are formed at the ends of the flange portions, respectively. A hat-shaped sheet pile provided with a male joint at the tip of the first arm and a female joint at the tip of the second arm, or one of both ends of the web. A second arm portion is formed on the other side of the first arm portion, a male side joint portion is provided at the tip of the first arm portion, and a female side joint portion is formed at the tip of the second arm portion. In the provided Z-shaped sheet pile,
The male side joint portion includes a first curved portion that curves from the free end of the first arm portion to the rear surface side, a second curved portion that is subsequently folded back to the front surface side, and subsequently the first arm portion. A third curved portion that is folded back in the extension direction, a U-shaped fourth curved portion that is folded back at the end, and substantially linearly from the fourth curved portion and substantially parallel to the first arm portion. Has a first hook extending in the direction of
The female side joint portion is curved in a direction parallel to the second arm portion, which is continuous with the fifth curved portion and the fifth curved portion curved from the free end of the second arm portion to the rear surface side. A U-shaped seventh curved portion that is continuous with the sixth curved portion and is folded back in a direction parallel to the second arm portion, and a continuous seventh curved portion. It has a second hooking portion that extends linearly in parallel with the second arm portion.
The length S6 from the outermost edge position of the second curved portion of the male side joint portion to the lower end position of the first arm portion is the length S6 from the tip position of the first hook portion of the male side joint portion to the first arm. The length S7 from the outermost edge position of the fourth curved portion of the male side joint portion to the tip position of the first hook portion is more than two-thirds of the length S5 in the vertical direction to the lower end position of the portion. It is characterized in that it exceeds the opening width U3 formed on the tip of the second hook portion of the female side joint portion and the inner surface of the fifth curved portion.

本発明の矢板によれば、該矢板の継手部を連結して形成した矢板壁体に曲げモーメントが作用し、両継手部が押し合う状況となった際、該両継手部において少なくとも２点での接触状態が形成され、継手部における作用力の集中を緩和することができる。これにより、継手部の変形および破壊が防止され、矢板壁体の剛性や耐力の低下を抑制することが可能となる。 According to the sheet pile of the present invention, when a bending moment acts on the sheet pile wall body formed by connecting the joint portions of the sheet pile and the two joint portions are pressed against each other, at least two points at the two joint portions. The contact state is formed, and the concentration of the acting force at the joint portion can be relaxed. As a result, deformation and breakage of the joint portion are prevented, and it is possible to suppress a decrease in the rigidity and proof stress of the sheet pile wall body.

本発明の実施の形態１のハット形状の矢板の説明図である。It is explanatory drawing of the hat-shaped sheet pile of Embodiment 1 of this invention. 図１に示したハット形状の矢板の継手部の拡大図である。It is an enlarged view of the joint part of the hat-shaped sheet pile shown in FIG. 本発明の実施の形態１のハット形状の矢板の作用を説明する説明図である。It is explanatory drawing explaining the operation of the hat-shaped sheet pile of Embodiment 1 of this invention. 本発明の実施の形態１の矢板の他の態様の説明図である。It is explanatory drawing of another aspect of the sheet pile of Embodiment 1 of this invention. 本発明の実施の形態２のハット形状の矢板の説明図である。It is explanatory drawing of the hat-shaped sheet pile of Embodiment 2 of this invention. 図５に示したハット形状の矢板の継手部の拡大図である。It is an enlarged view of the joint part of the hat-shaped sheet pile shown in FIG. 本発明の実施の形態２のハット形状の矢板の作用を説明する説明図である。It is explanatory drawing explaining the operation of the hat-shaped sheet pile of Embodiment 2 of this invention. 本発明の実施の形態２の矢板の他の態様の説明図である。It is explanatory drawing of another aspect of the sheet pile of Embodiment 2 of this invention. 本発明の実施の形態３のハット形状の矢板の説明図である。It is explanatory drawing of the hat-shaped sheet pile of Embodiment 3 of this invention. 図９に示したハット形状の矢板の継手部の拡大図である。It is an enlarged view of the joint part of the hat-shaped sheet pile shown in FIG. 本発明の実施の形態３のハット形状の矢板の作用を説明する説明図である。It is explanatory drawing explaining the operation of the hat-shaped sheet pile of Embodiment 3 of this invention. 本発明の実施の形態３の矢板の他の態様の説明図である。It is explanatory drawing of another aspect of the sheet pile of Embodiment 3 of this invention. 本発明が解決しようとする課題を説明する説明図である（その１）。It is explanatory drawing explaining the problem which this invention tries to solve (the 1). 本発明が解決しようとする課題を説明する説明図である（その２）。It is explanatory drawing explaining the problem which this invention tries to solve (the 2).

［実施の形態１］
本発明の一実施の形態に係る矢板１は、図１に示すように、ウェブ部３の両端に一対のフランジ部５が連続して形成され、各フランジ部５の端部に第１のアーム部７、第２のアーム部９がそれぞれ形成されるとともに、第１のアーム部７の先端に雄側継手部１１が設けられ、第２のアーム部９の先端に雌側継手部１３が設けられたハット形状の矢板１である。そして、ハット形状の矢板１は、矢板１を連結して形成された矢板壁体に曲げモーメントが作用し、両継手が押し合う状況となった際に、少なくとも２点での接触状態が形成され、継手部における作用力の集中を緩和することができるように構成されている。
以下、雄側継手部１１、雌側継手部１３及びこれらの関係について詳細に説明する。 [Embodiment 1]
In the sheet pile 1 according to the embodiment of the present invention, as shown in FIG. 1, a pair of flange portions 5 are continuously formed at both ends of the web portion 3, and a first arm is formed at the end of each flange portion 5. A portion 7 and a second arm portion 9 are formed, respectively, a male side joint portion 11 is provided at the tip of the first arm portion 7, and a female side joint portion 13 is provided at the tip of the second arm portion 9. It is a hat-shaped sheet pile 1. Then, in the hat-shaped sheet pile 1, when a bending moment acts on the sheet pile wall formed by connecting the sheet piles 1 and both joints are pressed against each other, a contact state is formed at at least two points. , It is configured so that the concentration of the acting force in the joint portion can be relaxed.
Hereinafter, the male side joint portion 11, the female side joint portion 13, and their relationships will be described in detail.

＜雄側継手部＞
雄側継手部１１は、図２（ａ）に示すように、第１のアーム部７の遊端から後面側に湾曲する第１湾曲部１５と、第１湾曲部１５に連続して折り返されたＵ字状の第２湾曲部１７と、第２湾曲部１７に連続して第１のアーム部７に向かって第１湾曲部１５の延長部とほぼ平行に直線状に延出する第１引掛部１９とを有している。
なお、雄側継手部１１の第１湾曲部１５は、第１のアーム部７の遊端から後面側に、5°から90°の範囲で折り曲げるのがよい。すなわち、図２に示すように、第１のアーム部７の延長線と第１湾曲部１５の接線の成す角度αが、5°から90°の範囲となるのが好ましい。 <Male side joint>
As shown in FIG. 2A, the male side joint portion 11 is continuously folded back to the first curved portion 15 that curves from the free end of the first arm portion 7 to the rear surface side and the first curved portion 15. A first U-shaped second curved portion 17 that extends linearly toward the first arm portion 7 in succession to the second curved portion 17 and substantially parallel to the extension portion of the first curved portion 15. It has a hooking portion 19.
The first curved portion 15 of the male side joint portion 11 is preferably bent in the range of 5 ° to 90 ° from the free end of the first arm portion 7 to the rear surface side. That is, as shown in FIG. 2, the angle α formed by the extension line of the first arm portion 7 and the tangent line of the first curved portion 15 is preferably in the range of 5 ° to 90 °.

＜雌側継手部＞
雌側継手部１３は、図２（ｂ）に示すように、第２のアーム部９の遊端から後面側に湾曲した第３湾曲部２１と、第３湾曲部２１に連続して前面側に向かって湾曲する第４湾曲部２３と、第４湾曲部２３に連続して雄側継手部１１の第１引掛部１９とほぼ平行になる方向に向かって折り返されたＵ字状の第５湾曲部２５と、第５湾曲部２５に連続して雄側継手部１１の第１引掛部１９とほぼ平行に直線状に延出する第２引掛部２７とを有している。 <Female side joint>
As shown in FIG. 2B, the female side joint portion 13 has a third curved portion 21 curved from the free end of the second arm portion 9 to the rear surface side, and a front side continuous with the third curved portion 21. A U-shaped fifth curved portion 23 that curves toward the fourth curved portion 23 and is folded back in a direction that is continuous with the fourth curved portion 23 and substantially parallel to the first hook portion 19 of the male side joint portion 11. It has a curved portion 25 and a second hook portion 27 that extends continuously to the fifth curved portion 25 in a straight line substantially parallel to the first hook portion 19 of the male side joint portion 11.

＜雄側継手部と雌側継手部の関係＞
雄側継手部１１と雌側継手部１３が嵌合状態において、曲げモーメント作用時に上述した少なくとも２点での接触状態が形成されるための条件として、ハット形状の矢板１は、以下の条件を備えている。
雄側継手部１１の第２湾曲部１７の最外縁位置から第１引掛部１９の端部位置までの長さをＳ１とし、雌側継手部１３の第４湾曲部２３における湾曲内側の最も奥の位置から第２引掛部２７の端部位置までの長さＵ１としたときに、Ｓ１がＵ１よりも長くなるように、すなわちＳ１＞Ｕ１となるように設定されている。
なお、Ｓ１は、雄側継手部１１の第２湾曲部１７の最外縁位置から第１引掛部１９の端部位置までの最短の長さであり、第１のアーム部７に直交方向の長さ、あるいは図２中では、鉛直方向の長さである。
また、Ｕ１は、雌側継手部１３の第４湾曲部２３における湾曲内側の最も奥の位置から第２引掛部２７の端部位置までの最短の長さであり、第２のアーム部９に直交方向の長さ、あるいは図２中では、鉛直方向の長さである。 <Relationship between male side joint and female side joint>
When the male side joint portion 11 and the female side joint portion 13 are in the fitted state, the hat-shaped sheet pile 1 satisfies the following conditions as conditions for forming the contact state at at least two points described above when the bending moment is applied. I have.
The length from the outermost edge position of the second curved portion 17 of the male side joint portion 11 to the end position of the first hook portion 19 is S1, and the innermost part of the curved inner side of the fourth curved portion 23 of the female joint portion 13 is set to S1. When the length U1 from the position of 2 to the end position of the second hook portion 27 is set, S1 is set to be longer than U1, that is, S1> U1.
Note that S1 is the shortest length from the outermost edge position of the second curved portion 17 of the male side joint portion 11 to the end position of the first hook portion 19, and is the length in the direction orthogonal to the first arm portion 7. Or, in FIG. 2, it is the length in the vertical direction.
Further, U1 is the shortest length from the innermost position on the inner side of the curve in the fourth curved portion 23 of the female side joint portion 13 to the end position of the second hook portion 27, and is attached to the second arm portion 9. It is the length in the orthogonal direction, or the length in the vertical direction in FIG.

上記のように構成された本実施の形態のハット形状の矢板１の作用について、図３に基づいて説明する。
図３（ａ）は雄側継手部１１と雌側継手部１３の通常の嵌合状態を示しており、図３（ａ）の状態から矢板壁体に曲げモーメントが作用し、両継手部が押し合う状態（押し込み嵌合状態）になったときには図３（ｂ）に示すように、雄側継手部１１のＵ字状の第２湾曲部１７の外面と雌側継手部１３の第３湾曲部２１から第４湾曲部２３に至るいずれかの部分（以下、「第３湾曲部２１〜第４湾曲部２３」と表記する。他の部位についても同様）の内面が接触し、かつ雄側継手部１１の第１引掛部１９と雌側継手部１３の第２引掛部２７の内面同士が接触する２点接触状態となる。
なお、２点接触に至るまでの過程であるが、通常、最初に１点で接触した後、継手部が弾性範囲内で変形し、２点接触に至ると考えられる。弾性範囲内であれば、継手部の変形量は微小であり、矢板１の断面性能に大きな影響は与えることはない。 The operation of the hat-shaped sheet pile 1 of the present embodiment configured as described above will be described with reference to FIG.
FIG. 3A shows a normal fitting state of the male side joint portion 11 and the female side joint portion 13, and a bending moment acts on the sheet pile wall body from the state of FIG. 3A, and both joint portions are formed. When they are pressed against each other (push-fitting state), as shown in FIG. 3 (b), the outer surface of the U-shaped second curved portion 17 of the male side joint portion 11 and the third curved portion of the female side joint portion 13. The inner surface of any portion from the portion 21 to the fourth curved portion 23 (hereinafter, referred to as "third curved portion 21 to the fourth curved portion 23"; the same applies to the other portions) is in contact with the male side. A two-point contact state is established in which the inner surfaces of the first hook portion 19 of the joint portion 11 and the second hook portion 27 of the female side joint portion 13 come into contact with each other.
Although it is a process leading to two-point contact, it is usually considered that after the first contact at one point, the joint portion is deformed within the elastic range and reaches two-point contact. If it is within the elastic range, the amount of deformation of the joint portion is very small, and the cross-sectional performance of the sheet pile 1 is not significantly affected.

また、押し込み嵌合状態から雄側継手部１１が図中下方側（矢板１の前面側）にずれた状態［押し込み嵌合状態（下ずれ）］になったときには、図３（ｃ）に示すように、接触点の位置が少しずれるものの図３（ｂ）と同様の部位が接触する２点接触状態となる。
さらに、押し込み嵌合状態から雄側継手が図中上方側（矢板１の後面側）にずれた状態［押し込み嵌合状態（上ずれ）］になったときには、図３（ｄ）に示すように、雄側継手部１１のＵ字状の第２湾曲部１７の外面と雌側継手部１３の第３湾曲部２１〜第４湾曲部２３の内面が接触し、かつ雄側継手部１１の第１引掛部１９の外面と雌側継手部１３の第４湾曲部２３〜第５湾曲部２５の内面が接触する２点接触状態となる。
また、押し込み嵌合状態から雄側継手部１１が図中下方側（矢板１の前面側）に回転した状態［押し込み＋回転］になったときには、図３（ｅ）に示すように、雄側継手部１１のＵ字状の第２湾曲部１７の外面と雌側継手部１３の第３湾曲部２１〜第４湾曲部２３の内面が接触し、かつ雄側継手部１１の第１引掛部１９の先端内面と雌側継手部１３の第２引掛部２７の内面とが接触する２点接触状態となる。 Further, when the male side joint portion 11 is displaced from the push-fitting state to the lower side (front side of the sheet pile 1) in the drawing [push-fitting state (downward deviation)], it is shown in FIG. 3 (c). As described above, although the positions of the contact points are slightly deviated, a two-point contact state is achieved in which the same parts as those in FIG. 3B are in contact.
Further, when the male side joint is displaced from the push-fitting state to the upper side (rear surface side of the sheet pile 1) in the drawing [push-fitting state (upward shift)], as shown in FIG. 3 (d). , The outer surface of the U-shaped second curved portion 17 of the male side joint portion 11 and the inner surface of the third curved portions 21 to 4 curved portions 23 of the female side joint portion 13 are in contact with each other, and the male side joint portion 11 is the first. 1 The outer surface of the hooking portion 19 and the inner surface of the fourth curved portion 23 to the fifth curved portion 25 of the female side joint portion 13 come into contact with each other in a two-point contact state.
Further, when the male side joint portion 11 is rotated to the lower side (front side of the sheet pile 1) in the drawing from the push-fitting state [push-in + rotation], as shown in FIG. 3 (e), the male side The outer surface of the U-shaped second curved portion 17 of the joint portion 11 and the inner surface of the third curved portions 21 to 4 curved portions 23 of the female side joint portion 13 are in contact with each other, and the first hook portion of the male side joint portion 11 A two-point contact state is established in which the inner surface of the tip of 19 and the inner surface of the second hook portion 27 of the female side joint portion 13 come into contact with each other.

以上のように、本実施の形態のハット形の矢板１においては、雄側継手部１１と雌側継手部１３の形状を上記のように設定したことで、ハット形の矢板１の継手部同士を連結して形成した矢板壁体に曲げモーメントが作用し、両継手部が押し合う状況となった際、少なくとも２点での接触状態が形成され、継手部作用力の集中を緩和することができる。これにより、継手部の変形および破壊を防止され、矢板壁体の剛性や耐力の低下を抑制することが可能となる。 As described above, in the hat-shaped sheet pile 1 of the present embodiment, the shapes of the male side joint portion 11 and the female side joint portion 13 are set as described above, so that the joint portions of the hat-shaped sheet pile 1 are connected to each other. When a bending moment acts on the sheet pile wall body formed by connecting the two joints and the two joints are pressed against each other, a contact state is formed at at least two points, and the concentration of the joint acting force can be relaxed. it can. As a result, deformation and breakage of the joint portion can be prevented, and deterioration of the rigidity and proof stress of the sheet pile wall body can be suppressed.

上記の説明はハット形状の矢板１を例に挙げたが、本発明はこれに限られるものではなく、図４に示すように、ウェブ部３の両端の一方には第１のアーム部７が他方には第２のアーム部９がそれぞれ形成され、第１のアーム部７の先端に雄側継手部１１が設けられ、第２のアーム部９の先端に雌側継手部１３が設けられたＺ形状の矢板２９にも適用できる。 Although the above description has taken a hat-shaped sheet pile 1 as an example, the present invention is not limited to this, and as shown in FIG. 4, a first arm portion 7 is provided on one of both ends of the web portion 3. On the other hand, a second arm portion 9 is formed, a male side joint portion 11 is provided at the tip of the first arm portion 7, and a female side joint portion 13 is provided at the tip of the second arm portion 9. It can also be applied to the Z-shaped sheet pile 29.

［実施の形態２］
本実施の形態の矢板３１は、図５に示すように、実施の形態１と同様に、ウェブ部３の両端に一対のフランジ部５が連続して形成され、各フランジ部５の端部に第１のアーム部７、第２のアーム部９がそれぞれ形成されるとともに、第１のアーム部７の先端に雄側継手部３３が設けられ、第２のアーム部９の先端に雌側継手部３５が設けられたハット形状の矢板３１である。
そして、ハット形状の矢板３１は、矢板３１を連結して形成された矢板壁体に曲げモーメントが作用し、両継手が押し合う状況となった際に、少なくとも２点での接触状態が形成され、継手部作用力の集中を緩和することができるように構成されている。
以下、雄側継手部３３、雌側継手部３５及びこれらの関係について詳細に説明する。 [Embodiment 2]
As shown in FIG. 5, in the sheet pile 31 of the present embodiment, a pair of flange portions 5 are continuously formed at both ends of the web portion 3 and at the end of each flange portion 5, as in the first embodiment. A first arm portion 7 and a second arm portion 9 are formed respectively, a male side joint portion 33 is provided at the tip of the first arm portion 7, and a female side joint portion is provided at the tip of the second arm portion 9. It is a hat-shaped sheet pile 31 provided with a portion 35.
Then, in the hat-shaped sheet pile 31, when a bending moment acts on the sheet pile wall formed by connecting the sheet piles 31 and both joints are pressed against each other, a contact state is formed at at least two points. , It is configured so that the concentration of the acting force of the joint can be relaxed.
Hereinafter, the male side joint portion 33, the female side joint portion 35, and their relationships will be described in detail.

＜雄側継手部＞
雄側継手部３３は、図６（ａ）に示すように、第１のアーム部７の遊端から後面側に湾曲する第１湾曲部３７と、続いて前面側に折り返される第２湾曲部３９と、第２湾曲部３９の延長部に連続して折り返されたＵ字状の第３湾曲部４１と、第３湾曲部４１に連続して第２湾曲部３９の延長部とほぼ平行に直線状に延出する第１引掛部４３とを有している。
なお、雄側継手部３３の第１湾曲部３７は、第１のアーム部７の遊端から後面側に、5°から90°の範囲で折り曲げるのがよい。すなわち、図６に示すように、第１のアーム部７の延長線と第１湾曲部３７の接線の成す角度βが、5°から90°の範囲となるのが好ましい。 <Male side joint>
As shown in FIG. 6A, the male side joint portion 33 has a first curved portion 37 that curves from the free end of the first arm portion 7 to the rear surface side, and subsequently a second curved portion that is folded back to the front surface side. 39, a U-shaped third curved portion 41 that is continuously folded back to the extension portion of the second curved portion 39, and a third curved portion 41 that is continuous and substantially parallel to the extension portion of the second curved portion 39. It has a first hook portion 43 extending in a straight line.
The first curved portion 37 of the male side joint portion 33 is preferably bent from the free end of the first arm portion 7 to the rear surface side in a range of 5 ° to 90 °. That is, as shown in FIG. 6, the angle β formed by the extension line of the first arm portion 7 and the tangent line of the first curved portion 37 is preferably in the range of 5 ° to 90 °.

＜雌側継手部＞
雌側継手部３５は、第２のアーム部９の遊端から後面側に湾曲した第４湾曲部４５と、第４湾曲部４５に連続して後面側斜め方向に湾曲する第５湾曲部４７と、第５湾曲部４７に連続して雄側継手部３３の第１引掛部４３とほぼ平行になる方向に向かって折り返されたＵ字状の第６湾曲部４９と、第６湾曲部４９に連続して雄側継手部３３の第１引掛部４３とほぼ平行に直線状に延出する第２引掛部５１とを有している。 <Female side joint>
The female side joint portion 35 has a fourth curved portion 45 that is curved from the free end of the second arm portion 9 to the rear surface side, and a fifth curved portion 47 that is continuous with the fourth curved portion 45 and is curved in the rear surface side oblique direction. A U-shaped sixth curved portion 49 and a sixth curved portion 49 that are bent in a direction that is continuous with the fifth curved portion 47 and substantially parallel to the first hook portion 43 of the male side joint portion 33. It has a second hooking portion 51 that extends linearly in parallel with the first hooking portion 43 of the male side joint portion 33.

＜雄側継手部と雌側継手部の関係＞
上述した少なくとも２点での接触状態が形成されるための条件について、図６（ｂ）に基づいて説明する。
雄側継手部３３の第２湾曲部３９の最外縁位置から第１のアーム部７の下端位置までの長さをＳ３とし、雄側継手部３３の第１引掛部４３の先端位置から第１のアーム部７の下端位置までの長さをＳ２としたときに、Ｓ３がＳ２の0.5倍を越えること。
また、雄側継手部３３の第３湾曲部４１の最外縁位置から第１引掛部４３の先端位置までの長さをＳ４としたときに、Ｓ４が雌側継手部３５の第２引掛部５１の先端と第４湾曲部４５の内面で形成される開口部幅Ｕ２を上回ること。 <Relationship between male side joint and female side joint>
The conditions for forming the contact state at at least two points described above will be described with reference to FIG. 6 (b).
The length from the outermost edge position of the second curved portion 39 of the male side joint portion 33 to the lower end position of the first arm portion 7 is S3, and the first from the tip position of the first hook portion 43 of the male side joint portion 33 to the first. When the length to the lower end position of the arm portion 7 of is S2, S3 exceeds 0.5 times that of S2.
Further, when the length from the outermost edge position of the third curved portion 41 of the male side joint portion 33 to the tip position of the first hook portion 43 is S4, S4 is the second hook portion 51 of the female side joint portion 35. Exceeding the opening width U2 formed on the tip of the and the inner surface of the fourth curved portion 45.

なお、Ｓ３は、雄側継手部３３の第２湾曲部３９の最外縁位置から第１のアーム部７の下端位置までの最短の長さであり、第１のアーム部７に直交方向の長さであり、図６中では、鉛直方向の長さである。
また、Ｓ２は、雄側継手部３３の第１引掛部４３の先端位置から第１のアーム部７の下端位置までの最短の長さであり、第１のアーム部７に直交方向の長さであり、図６中では、鉛直方向の長さである。
また、Ｓ４は、雄側継手部３３の第３湾曲部４１の最外縁位置から第１引掛部４３の先端位置までの最短の長さであり、第１のアーム部７に平行方向の長さであり、図６中では、水平方向の長さである。
また、開口部幅Ｕ２は、雌側継手部３５の第２引掛部５１の先端と第４湾曲部４５の内面で形成される開口部の最短幅であり、第２のアーム部９に平行な長さであり、図６中では、水平方向の長さである。 Note that S3 is the shortest length from the outermost edge position of the second curved portion 39 of the male side joint portion 33 to the lower end position of the first arm portion 7, and is the length in the direction orthogonal to the first arm portion 7. In FIG. 6, it is the length in the vertical direction.
Further, S2 is the shortest length from the tip position of the first hook portion 43 of the male side joint portion 33 to the lower end position of the first arm portion 7, and is the length in the direction orthogonal to the first arm portion 7. In FIG. 6, it is the length in the vertical direction.
Further, S4 is the shortest length from the outermost edge position of the third curved portion 41 of the male side joint portion 33 to the tip position of the first hook portion 43, and is the length in the direction parallel to the first arm portion 7. In FIG. 6, it is the length in the horizontal direction.
Further, the opening width U2 is the shortest width of the opening formed on the tip of the second hook portion 51 of the female side joint portion 35 and the inner surface of the fourth curved portion 45, and is parallel to the second arm portion 9. It is the length, and in FIG. 6, it is the length in the horizontal direction.

上記のように構成された本実施の形態のハット形状の矢板３１の作用について、図７に基づいて説明する。
図７（ａ）は雄側継手部３３と雌側継手部３５の通常の嵌合状態を示しており、図７（ａ）の状態から矢板壁体に曲げモーメントが作用し、両継手部が押し合う状態（押し込み嵌合状態）になったときには図７（ｂ）に示すように、雄側継手部３３のＵ字状の第３湾曲部４１の外面と雌側継手部３５の第４湾曲部４５〜第５湾曲部４７の内面が接触し、かつ雄側継手部３３の第２湾曲部３９の内面と雌側継手部３５の第２引掛部５１の外面とが接触する２点接触状態となる。
なお、２点接触に至るまでの過程であるが、通常、最初に１点で接触した後、継手部が弾性範囲内で変形し、２点接触に至ると考えられる。弾性範囲内であれば、継手部の変形量は微小であり、矢板３１の断面性能に大きな影響は与えることはない。 The operation of the hat-shaped sheet pile 31 of the present embodiment configured as described above will be described with reference to FIG. 7.
FIG. 7A shows a normal fitting state of the male side joint portion 33 and the female side joint portion 35, and a bending moment acts on the sheet pile wall body from the state of FIG. 7A, and both joint portions are formed. When they are pressed against each other (push-fitting state), as shown in FIG. 7B, the outer surface of the U-shaped third curved portion 41 of the male side joint portion 33 and the fourth curvature of the female side joint portion 35. A two-point contact state in which the inner surfaces of the portions 45 to the fifth curved portion 47 are in contact with each other, and the inner surface of the second curved portion 39 of the male side joint portion 33 and the outer surface of the second hook portion 51 of the female joint portion 35 are in contact with each other. It becomes.
Although it is a process leading to two-point contact, it is usually considered that after the first contact at one point, the joint portion is deformed within the elastic range and reaches two-point contact. If it is within the elastic range, the amount of deformation of the joint portion is very small, and the cross-sectional performance of the sheet pile 31 is not significantly affected.

また、押し込み嵌合状態から雄側継手部３３が図中下方側（矢板３１の前面側）にずれた状態［押し込み嵌合状態（下ずれ）］になったときには、図７（ｃ）に示すように、接触点の位置が少しずれるものの図７（ｂ）と同様の部位が接触する２点接触状態となる。
さらに、押し込み嵌合状態から雄側継手部３３が図中上方側（矢板３１の後面側）にずれた状態［押し込み嵌合状態（上ずれ）］になったときにも、図７（ｄ）に示すように、接触点の位置が少しずれるものの図７（ｂ）と同様の部位が接触する２点接触状態となる。
また、押し込み嵌合状態から雄側継手が部３３図中下方側（矢板３１の前面側）に回転した状態［押し込み＋回転］になったときには、図７（ｅ）に示すように、雄側継手部３３のＵ字状の第３湾曲部４１の外面と雌側継手部３５の第４湾曲部４５〜第５湾曲部４７の内面が接触し、かつ雄側継手部３３の第１引掛部４３の先端内面と雌側継手部３５の第２引掛部５１の内面とが接触する２点接触状態となる。 Further, when the male side joint portion 33 is displaced from the push-fitting state to the lower side (front side of the sheet pile 31) in the drawing [push-fitting state (downward deviation)], it is shown in FIG. 7 (c). As described above, although the positions of the contact points are slightly deviated, a two-point contact state is achieved in which the same parts as those in FIG. 7B are in contact.
Further, even when the male side joint portion 33 is displaced from the push-fitting state to the upper side (rear surface side of the sheet pile 31) in the drawing [push-fitting state (upward shift)], FIG. 7 (d) is shown. As shown in FIG. 7, although the positions of the contact points are slightly deviated, a two-point contact state is achieved in which the same parts as those in FIG. 7B are in contact.
Further, when the male side joint is rotated to the lower side (front side of the sheet pile 31) in the section 33 from the push-fitting state [push + rotation], as shown in FIG. 7 (e), the male side The outer surface of the U-shaped third curved portion 41 of the joint portion 33 and the inner surface of the fourth curved portion 45 to the fifth curved portion 47 of the female side joint portion 35 are in contact with each other, and the first hook portion of the male side joint portion 33. A two-point contact state is established in which the inner surface of the tip of 43 and the inner surface of the second hooking portion 51 of the female joint portion 35 come into contact with each other.

以上のように、本実施の形態のハット形の矢板３１においては、雄側継手部３３と雌側継手部３５の形状を上記のように設定したことで、ハット形の矢板３１の継手部同士を連結して形成した矢板壁体に曲げモーメントが作用し、両継手部が押し合う状況となった際、少なくとも２点での接触状態が形成され、継手部作用力の集中を緩和することができる。これにより、継手部の変形および破壊を防止され、矢板壁体の剛性や耐力の低下を抑制することが可能となる。 As described above, in the hat-shaped sheet pile 31 of the present embodiment, by setting the shapes of the male side joint portion 33 and the female side joint portion 35 as described above, the joint portions of the hat-shaped sheet pile 31 are connected to each other. When a bending moment acts on the sheet pile wall body formed by connecting the two joints and the two joints are pressed against each other, a contact state is formed at at least two points, and the concentration of the joint acting force can be relaxed. it can. As a result, deformation and breakage of the joint portion can be prevented, and deterioration of the rigidity and proof stress of the sheet pile wall body can be suppressed.

上記の説明はハット形状の矢板３１を例に挙げたが、本発明はこれに限られるものではなく、図８に示すように、ウェブ部３の両端の一方には第１のアーム部７が他方には第２のアーム部９がそれぞれ形成され、前記第１のアーム部７の先端に雄側継手部３３が設けられ、前記第２のアーム部９の先端に雌側継手部３５が設けられたＺ形状の矢板５３にも適用できる。 Although the above description has taken a hat-shaped sheet pile 31 as an example, the present invention is not limited to this, and as shown in FIG. 8, a first arm portion 7 is provided on one of both ends of the web portion 3. On the other hand, a second arm portion 9 is formed, a male side joint portion 33 is provided at the tip of the first arm portion 7, and a female side joint portion 35 is provided at the tip of the second arm portion 9. It can also be applied to the Z-shaped sheet pile 53.

［実施の形態３］
本実施の形態の矢板５５は、図９に示すように、実施の形態１と同様に、ウェブ部３の両端に一対のフランジ部５が連続して形成され、各フランジ部５の端部に第１のアーム部７、第２のアーム部９がそれぞれ形成されるとともに、第１のアーム部７の先端に雄側継手部５７が設けられ、第２のアーム部９の先端に雌側継手部５９が設けられたハット形状の矢板５５である。
そして、ハット形状の矢板５５は、矢板５５を連結して形成された矢板壁体に曲げモーメントが作用し、両継手部が押し合う状況となった際に、少なくとも２点での接触状態が形成され、継手部作用力の集中を緩和することができるように構成されている。
以下、雄側継手部５７、雌側継手部５９及びこれらの関係について詳細に説明する。 [Embodiment 3]
As shown in FIG. 9, in the sheet pile 55 of the present embodiment, as in the first embodiment, a pair of flange portions 5 are continuously formed at both ends of the web portion 3, and the end portions of the flange portions 5 are formed. A first arm portion 7 and a second arm portion 9 are formed respectively, a male side joint portion 57 is provided at the tip of the first arm portion 7, and a female side joint portion is provided at the tip of the second arm portion 9. A hat-shaped sheet pile 55 provided with a portion 59.
Then, in the hat-shaped sheet pile 55, when a bending moment acts on the sheet pile wall formed by connecting the sheet piles 55 and both joints are pressed against each other, a contact state is formed at at least two points. It is configured so that the concentration of the acting force of the joint can be relaxed.
Hereinafter, the male side joint portion 57, the female side joint portion 59, and their relationships will be described in detail.

＜雄側継手部＞
雄側継手部５７は、図１０（ａ）に示すように、第１のアーム部７の遊端から後面側に湾曲する第１湾曲部６１と、続いて前面側に折り返される第２湾曲部６３と、続いて第１のアーム部７の延長方向になるように湾曲する第３湾曲部６５と、その先に折り返されてＵ字状の第４湾曲部６７と、第４湾曲部６７からほぼ直線状に第１のアーム部７とほぼ平行になる方向に延出する第１引掛部６９とを有している。
なお、雄側継手部５７の第１湾曲部６１は、第１のアーム部７の遊端から後面側に、5°から90°の範囲で折り曲げるのがよい。すなわち、図１０に示すように、第１のアーム部７の延長線と第１湾曲部６１の接線の成す角度γが、5°から90°の範囲となるのが好ましい。 <Male side joint>
As shown in FIG. 10A, the male side joint portion 57 has a first curved portion 61 that curves from the free end of the first arm portion 7 to the rear surface side, and subsequently a second curved portion that is folded back to the front surface side. From 63, a third curved portion 65 that is subsequently curved so as to extend in the extension direction of the first arm portion 7, a U-shaped fourth curved portion 67 that is folded back at the tip, and a fourth curved portion 67. It has a first hooking portion 69 extending in a direction substantially parallel to the first arm portion 7 in a substantially linear shape.
The first curved portion 61 of the male side joint portion 57 is preferably bent in the range of 5 ° to 90 ° from the free end of the first arm portion 7 to the rear surface side. That is, as shown in FIG. 10, the angle γ formed by the extension line of the first arm portion 7 and the tangent line of the first curved portion 61 is preferably in the range of 5 ° to 90 °.

＜雌側継手部＞
雌側継手部５９は、第２のアーム部９の遊端から後面側に湾曲した第５湾曲部７１と、第５湾曲部７１に連続して第２のアーム部９と平行となる方向に湾曲する第６湾曲部７３と、第６湾曲部７３に連続して第２のアーム部９と平行になる方向に向かって折り返されたＵ字状の第７湾曲部７５と、第７湾曲部７５に連続して第２のアーム部９とほぼ平行に直線状に延出する第２引掛部７７とを有している。 <Female side joint>
The female side joint portion 59 has a fifth curved portion 71 that is curved from the free end of the second arm portion 9 to the rear surface side, and a direction that is continuous with the fifth curved portion 71 and parallel to the second arm portion 9. A curved sixth curved portion 73, a U-shaped seventh curved portion 75 that is bent in a direction continuous with the sixth curved portion 73 and parallel to the second arm portion 9, and a seventh curved portion. It has a second hook portion 77 that extends linearly in parallel with the second arm portion 9 that is continuous with the 75.

＜雄側継手部と雌側継手部の関係＞
上述した少なくとも２点での接触状態が形成されるための条件について、図１０（ｂ）に基づいて説明する。
雄側継手部５７の第２湾曲部６３の最外縁位置から第１のアーム部７の下端位置までの長さをＳ６とし、雄側継手部５７の第１引掛部６９の先端位置から第１のアーム部７の下端位置までの鉛直方向長さをＳ５としたときに、Ｓ６がＳ５の２/３倍を越えること。
また、雄側継手部５７の第４湾曲部６７の最外縁位置から第１引掛部６９の先端位置までの長さＳ７が、雌側継手部５９の第２引掛部７７の先端と第５湾曲部７１の内面で形成される開口部幅Ｕ３を越えること。 <Relationship between male side joint and female side joint>
The conditions for forming the contact state at at least two points described above will be described with reference to FIG. 10 (b).
The length from the outermost edge position of the second curved portion 63 of the male side joint portion 57 to the lower end position of the first arm portion 7 is S6, and the first from the tip position of the first hook portion 69 of the male side joint portion 57 to the first. When the length in the vertical direction to the lower end position of the arm portion 7 is S5, S6 exceeds 2/3 times that of S5.
Further, the length S7 from the outermost edge position of the fourth curved portion 67 of the male side joint portion 57 to the tip position of the first hook portion 69 is the tip of the second hook portion 77 of the female side joint portion 59 and the fifth curvature. Exceeding the opening width U3 formed on the inner surface of the portion 71.

なお、Ｓ６は、雄側継手部５７の第２湾曲部６３の最外縁位置から第１のアーム部７の下端位置までの最短の長さであり、第１のアーム部７に直交方向の長さであり、図１０中では、鉛直方向の長さである。
また、Ｓ５は、雄側継手部５７の第１引掛部６９の先端位置から第１のアーム部７の下端位置までの最短の長さであり、第１のアーム部７に直交方向の長さであり、図１０中では、鉛直方向の長さである。
また、Ｓ７は、雄側継手部５７の第４湾曲部６７の最外縁位置から第１引掛部６９の先端位置までの最短の長さであり、第１のアーム部７に平行方向の長さであり、図１０中では、水平方向の長さである。
また、開口部幅Ｕ３は、雌側継手部５９の第２引掛部７７の先端と第５湾曲部７１の内面で形成される開口部の最短幅であり、第２のアーム部９に平行な長さであり、図１０中では、水平方向の長さである。 Note that S6 is the shortest length from the outermost edge position of the second curved portion 63 of the male side joint portion 57 to the lower end position of the first arm portion 7, and is the length in the direction orthogonal to the first arm portion 7. In FIG. 10, it is the length in the vertical direction.
Further, S5 is the shortest length from the tip position of the first hook portion 69 of the male side joint portion 57 to the lower end position of the first arm portion 7, and is the length in the direction orthogonal to the first arm portion 7. In FIG. 10, it is the length in the vertical direction.
Further, S7 is the shortest length from the outermost edge position of the fourth curved portion 67 of the male side joint portion 57 to the tip position of the first hook portion 69, and is the length in the direction parallel to the first arm portion 7. In FIG. 10, it is the length in the horizontal direction.
Further, the opening width U3 is the shortest width of the opening formed on the tip of the second hook portion 77 of the female side joint portion 59 and the inner surface of the fifth curved portion 71, and is parallel to the second arm portion 9. It is the length, and in FIG. 10, it is the length in the horizontal direction.

上記のように構成された本実施の形態のハット形状の矢板５５の作用について、図１１に基づいて説明する。
図１１（ａ）は雄側継手部５７と雌側継手部５９の通常の嵌合状態を示しており、図１１（ａ）の状態から矢板壁体に曲げモーメントが作用し、両継手部が押し合う状態（押し込み嵌合状態）になったときには図１１（ｂ）に示すように、雄側継手部５７のＵ字状の第４湾曲部６７の外面と雌側継手部５９の第５湾曲部７１〜第６湾曲部７３の内面が接触し、かつ雄側継手部５７の第２湾曲部６３の内面と雌側継手部５９のＵ字状の第７湾曲部７５の外面とが接触する２点接触状態となる。
なお、２点接触に至るまでの過程であるが、通常、最初に１点で接触した後、継手部が弾性範囲内で変形し、２点接触に至ると考えられる。弾性範囲内であれば、継手部の変形量は微小であり、矢板５５の断面性能に大きな影響は与えることはない。 The operation of the hat-shaped sheet pile 55 of the present embodiment configured as described above will be described with reference to FIG.
FIG. 11A shows a normal fitting state of the male side joint portion 57 and the female side joint portion 59, and a bending moment acts on the sheet pile wall body from the state of FIG. 11A, and both joint portions are formed. When the male side joint portion 57 is in the pressed state (push-fitted state), the outer surface of the U-shaped fourth curved portion 67 of the male side joint portion 57 and the fifth curved portion of the female side joint portion 59 are formed. The inner surfaces of the portions 71 to 6 are in contact with each other, and the inner surface of the second curved portion 63 of the male side joint portion 57 is in contact with the outer surface of the U-shaped seventh curved portion 75 of the female side joint portion 59. It becomes a two-point contact state.
Although it is a process leading to two-point contact, it is usually considered that after the first contact at one point, the joint portion is deformed within the elastic range and reaches two-point contact. If it is within the elastic range, the amount of deformation of the joint portion is very small, and the cross-sectional performance of the sheet pile 55 is not significantly affected.

また、押し込み嵌合状態から雄側継手部５７が図中下方側（矢板５５の前面側）にずれた状態［押し込み嵌合状態（下ずれ）］になったときには、図１１（ｃ）に示すように、接触点の位置が少しずれるものの図１１（ｂ）と同様の部位が接触する２点接触状態となる。
さらに、押し込み嵌合状態から雄側継手部５７が図中上方側（矢板５５の後面側）にずれた状態［押し込み嵌合状態（上ずれ）］になったときにも、図１１（ｄ）に示すように、接触点の位置が少しずれるものの図１１（ｂ）と同様の部位が接触する２点接触状態となる。
また、押し込み嵌合状態から雄側継手部５７が図中下方側（矢板５５の前面側）に回転した状態［押し込み＋回転］になったときには、図１１（ｅ）に示すように、雄側継手部５７のＵ字状の第４湾曲部６７の外面と雌側継手部５９の第６湾曲部７３の内面が接触し、かつ雄側継手部５７の第３湾曲部６５〜第４湾曲部６７の内面と雌側継手部５９の第２引掛部７７の先端外面とが接触する２点接触状態となる。 Further, when the male side joint portion 57 is displaced from the push-fitting state to the lower side (front side of the sheet pile 55) in the drawing [push-fitting state (downward deviation)], it is shown in FIG. 11 (c). As described above, although the positions of the contact points are slightly deviated, a two-point contact state is achieved in which the same parts as those in FIG. 11B are in contact.
Further, even when the male side joint portion 57 is displaced from the push-fitting state to the upper side (rear surface side of the sheet pile 55) in the drawing [push-fitting state (upward shift)], FIG. 11 (d) is shown. As shown in FIG. 11, although the positions of the contact points are slightly deviated, a two-point contact state is achieved in which the same parts as those in FIG. 11B are in contact.
Further, when the male side joint portion 57 is rotated to the lower side (front side of the sheet pile 55) in the drawing from the push-fitting state [push + rotation], as shown in FIG. 11 (e), the male side The outer surface of the U-shaped fourth curved portion 67 of the joint portion 57 and the inner surface of the sixth curved portion 73 of the female side joint portion 59 are in contact with each other, and the third curved portion 65 to fourth curved portion of the male side joint portion 57. The inner surface of 67 and the outer surface of the tip of the second hook portion 77 of the female side joint portion 59 are in contact with each other in a two-point contact state.

以上のように、本実施の形態のハット形の矢板５５においては、雄側継手部５７と雌側継手部５９の形状を上記のように設定したことで、ハット形の矢板５５の継手部同士を連結して形成した矢板壁体に曲げモーメントが作用し、両継手部が押し合う状況となった際、少なくとも２点での接触状態が形成され、継手部作用力の集中を緩和することができる。これにより、継手部の変形および破壊を防止され、矢板壁体の剛性や耐力の低下を抑制することが可能となる。 As described above, in the hat-shaped sheet pile 55 of the present embodiment, by setting the shapes of the male side joint portion 57 and the female side joint portion 59 as described above, the joint portions of the hat-shaped sheet pile 55 are connected to each other. When a bending moment acts on the sheet pile wall body formed by connecting the two joints and the two joints are pressed against each other, a contact state is formed at at least two points, and the concentration of the joint acting force can be relaxed. it can. As a result, deformation and breakage of the joint portion can be prevented, and deterioration of the rigidity and proof stress of the sheet pile wall body can be suppressed.

上記の説明はハット形状の矢板５５を例に挙げたが、本発明はこれに限られるものではなく、図１２に示すように、ウェブ部３の両端の一方には第１のアーム部７が他方には第２のアーム部９がそれぞれ形成され、前記第１のアーム部７の先端に雄側継手部５７が設けられ、前記第２のアーム部９の先端に雌側継手部５９が設けられたＺ形状の矢板７９にも適用できる。 Although the above description has taken a hat-shaped sheet pile 55 as an example, the present invention is not limited to this, and as shown in FIG. 12, a first arm portion 7 is provided on one of both ends of the web portion 3. On the other hand, a second arm portion 9 is formed, a male side joint portion 57 is provided at the tip of the first arm portion 7, and a female side joint portion 59 is provided at the tip of the second arm portion 9. It can also be applied to the Z-shaped sheet pile 79.

１矢板（実施の形態１）
３ウェブ部
５フランジ部
７第１のアーム部
９第２のアーム部
１１雄側継手部
１３雌側継手部
１５第１湾曲部
１７第２湾曲部
１９第１引掛部
２１第３湾曲部
２３第４湾曲部
２５第５湾曲部
２７第２引掛部
２９Ｚ形状の矢板
３１矢板（実施の形態２）
３３雄側継手部
３５雌側継手部
３７第１湾曲部
３９第２湾曲部
４１第３湾曲部
４３第１引掛部
４５第４湾曲部
４７第５湾曲部
４９第６湾曲部
５１第２引掛部
５３Ｚ形状の矢板
５５矢板（実施の形態３）
５７雄側継手部
５９雌側継手部
６１第１湾曲部
６３第２湾曲部
６５第３湾曲部
６７第４湾曲部
６９第１引掛部
７１第５湾曲部
７３第６湾曲部
７５第７湾曲部
７７第２引掛部
７９Ｚ形状の矢板
８１ウェブ部（従来例）
８３フランジ部
８５第１のアーム部
８７第２のアーム部
８９雄側継手部
９１雌側継手部
９３矢板 1 sheet pile (Embodiment 1)
3 Web part 5 Flange part 7 1st arm part 9 2nd arm part 11 Male side joint part 13 Female side joint part 15 1st curved part 17 2nd curved part 19 1st hooking part 21 3rd curved part 23 4 Curved portion 25 Fifth curved portion 27 Second hooking portion 29 Z-shaped sheet pile 31 Sheet pile (Embodiment 2)
33 Male side joint part 35 Female side joint part 37 1st curved part 39 2nd curved part 41 3rd curved part 43 1st hooking part 45 4th curved part 47 5th curved part 49 6th curved part 51 2nd hooking part 53 Z-shaped sheet pile 55 Sheet pile (Embodiment 3)
57 Male side joint part 59 Female side joint part 61 1st curved part 63 2nd curved part 65 3rd curved part 67 4th curved part 69 1st hooking part 71 5th curved part 73 6th curved part 75 7th curved part 77 Second hooking part 79 Z-shaped sheet pile 81 Web part (conventional example)
83 Flange part 85 First arm part 87 Second arm part 89 Male side joint part 91 Female side joint part 93 Sheet pile

Claims

A pair of flange portions are continuously formed at both ends of the web portion, a first arm portion and a second arm portion are formed at the ends of the flange portions, and at the tip of the first arm portion. A hat-shaped sheet pile provided with a male side joint and a female joint at the tip of the second arm, or a first arm on one end of the web and a first arm on the other. In a Z-shaped sheet pile in which two arm portions are formed, a male side joint portion is provided at the tip of the first arm portion, and a female side joint portion is provided at the tip of the second arm portion.
The male side joint portion includes a first curved portion that curves from the free end of the first arm portion to the rear surface side, a second curved portion that is subsequently folded back to the front surface side, and subsequently the first arm portion. A third curved portion that is folded back in the extension direction, a U-shaped fourth curved portion that is folded back at the end, and substantially linearly from the fourth curved portion and substantially parallel to the first arm portion. Has a first hook extending in the direction of
The female side joint portion is curved in a direction parallel to the second arm portion, which is continuous with the fifth curved portion and the fifth curved portion curved from the free end of the second arm portion to the rear surface side. A U-shaped seventh curved portion that is continuous with the sixth curved portion and is folded back in a direction parallel to the second arm portion, and a continuous seventh curved portion. It has a second hooking portion that extends linearly in parallel with the second arm portion.
The length S6 from the outermost edge position of the second curved portion of the male side joint portion to the lower end position of the first arm portion is the length S6 from the tip position of the first hook portion of the male side joint portion to the first arm. The length S7 from the outermost edge position of the fourth curved portion of the male side joint portion to the tip position of the first hook portion is more than two-thirds of the length S5 in the vertical direction to the lower end position of the portion. Beyond the opening width U3 formed on the tip of the second hook portion of the female side joint portion and the inner surface of the fifth curved portion .
In the fitted state of the male side joint portion and the female side joint portion, the first hook portion of the male side joint portion and the second hook portion of the female side joint portion do not come into contact with each other. A sheet pile characterized by becoming.