JP6696822B2 - Foundation structure - Google Patents

Foundation structure Download PDF

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JP6696822B2
JP6696822B2 JP2016089688A JP2016089688A JP6696822B2 JP 6696822 B2 JP6696822 B2 JP 6696822B2 JP 2016089688 A JP2016089688 A JP 2016089688A JP 2016089688 A JP2016089688 A JP 2016089688A JP 6696822 B2 JP6696822 B2 JP 6696822B2
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tip
steel sheet
basic structure
sheet pile
footing
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JP2017197974A (en
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和秀 戸田
和秀 戸田
太亮 佐名川
太亮 佐名川
西岡　英俊
英俊 西岡
直之 喜多
直之 喜多
光佑 松浦
光佑 松浦
妙中　真治
真治 妙中
和孝 乙志
和孝 乙志
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Obayashi Corp
Railway Technical Research Institute
Nippon Steel Corp
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Obayashi Corp
Railway Technical Research Institute
Nippon Steel Corp
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Description

本発明は、上部構造を支持する基礎構造に係り、具体的には、鋼矢板を用いて地震などの際に強い構造物を構築することができる基礎構造に関するものである。   The present invention relates to a foundation structure that supports an upper structure, and more specifically, to a foundation structure that can use a steel sheet pile to construct a strong structure during an earthquake or the like.

従来、上部構造を支持する基礎構造としては、種々の構造が知られており、熱間圧延で製造され、ウェブ部の両端に一対のフランジ部が配置され、フランジ部の先端側に継手部が配置された鋼矢板を複数連結して平面多角形状に形成された鋼矢板構造体と、コンクリート製の直接基礎とを結合した鋼矢板併用直接基礎などが知られている。   Conventionally, as a basic structure for supporting the upper structure, various structures are known, manufactured by hot rolling, a pair of flange portions are arranged at both ends of the web portion, and a joint portion is provided on the tip side of the flange portion. A steel sheet pile combined direct foundation in which a steel sheet pile structure formed by connecting a plurality of arranged steel sheet piles in a planar polygonal shape and a direct foundation made of concrete are combined is known.

また、従来の基礎構造によると、鋼矢板の打設時の変形や損傷によって所望する鉛直支持力を発揮することができない場合があり、これを防止するために例えば特許文献１に記載されているように、鋼矢板本体の開断面を閉じる閉合鋼材の長さ寸法を鋼矢板本体の断面高さ寸法に対して２倍以上に設定することで、支持層などの硬質な基盤に鋼矢板の先端部を打ち付けた場合でも、閉合鋼材のめくり上がりが防止でき、鋼矢板本体の変形を防止して打設後の鉛直精度も確保でき、十分な支持力を確保することができるものである。   Further, according to the conventional basic structure, it may not be possible to exert a desired vertical supporting force due to deformation or damage at the time of driving the steel sheet pile, and in order to prevent this, it is described in Patent Document 1, for example. As described above, by setting the length dimension of the closed steel material that closes the open cross section of the steel sheet pile main body to twice or more the cross sectional height dimension of the steel sheet pile main body, the tip of the steel sheet pile is supported on a hard base such as a support layer. Even when the portion is hammered, the closed steel material can be prevented from turning up, the deformation of the steel sheet pile body can be prevented, and the vertical accuracy after driving can be ensured, and a sufficient supporting force can be secured.

特開２００８−２４８５０３号公報JP 2008-248503 A

しかし、従来の基礎構造によると、地震などによって地盤の変形が生じると、地層境界に存在する杭やシートパイルといった構造物に大きな断面力が生じ、これらの構造物が損傷してしまう可能性があった。また、このような地盤の変形は軟弱地盤や液状化地盤において、特に顕著に生じるため、これらの軟弱地盤や液状化地盤へ基礎構造を施工する場合でも十分な支持力を確保することができる基礎構造が望まれていた。   However, according to the conventional foundation structure, when the ground is deformed due to an earthquake or the like, a large cross-sectional force is generated in the structures such as piles and sheet piles existing at the boundary of the stratum, and these structures may be damaged. there were. In addition, since such deformation of the ground is particularly noticeable in the soft ground and the liquefied ground, it is possible to secure sufficient bearing capacity even when constructing the foundation structure on these soft ground and liquefied ground. The structure was desired.

また、従来の基礎構造のように、先端加工部を基盤１０２に貫入させると、例えば図６に示すように閉合鋼材１２６を設けた部位と、鋼矢板本体１２１のみの部位との連続部が地層境界１０３と重複することとなる。このとき、上側の地層１０１が地盤の変化に伴って移動すると、当該位置が鋼矢板の断面変化点となって応力が集中してしまうという課題を有していた。   Further, as in the case of the conventional foundation structure, when the tip processed portion is penetrated into the base 102, for example, as shown in FIG. 6, the continuous portion of the portion where the closed steel material 126 is provided and the portion where only the steel sheet pile body 121 is formed is a stratum. It will overlap with the boundary 103. At this time, when the upper stratum 101 moves along with the change of the ground, the position becomes a cross-sectional change point of the steel sheet pile, and the stress is concentrated.

そこで、本発明は上記問題に鑑みてなされたものであり、上部構造を支持する基礎構造について、地震時に生じる地盤変形に対しても強い強度を有すると共に、地盤の変化に伴う応力集中を防止し、軟弱地盤や液状化地盤についても想定外の外力により構造物が破壊することを防止することが可能となる基礎構造を提供することを目的とする。   Therefore, the present invention has been made in view of the above problems, and with respect to the foundation structure that supports the upper structure, it has a strong strength against the ground deformation that occurs during an earthquake and prevents the stress concentration due to the ground change. It is an object of the present invention to provide a foundation structure that can prevent the structure from being broken by an unexpected external force even on soft ground and liquefied ground.

本発明に係る基礎構造は、液状化地層と非液状化地層をまたぐように配置される基礎構造であって、前記基礎構造は、フーチングと、該フーチングに一体に形成されると共に複数の地層を介して基盤に貫入された基礎構造体と、前記フーチングに設けられた増しフーチングと、該増しフーチングの外周方向に沿って並ぶと共に前記基礎構造体と略平行に延びる先端加工鋼矢板とを備え、前記先端加工鋼矢板は、ウェブ部と、該ウェブ部の両端に連続して形成された一対のフランジ部と、これら一対のフランジ部の先端側に形成された継手部を有した鋼矢板本体と、該鋼矢板本体の長手方向先端部における前記一対のフランジ部の先端間に渡って接合され、該鋼矢板本体の開断面を閉塞する閉合鋼材を有する先端加工部が形成され、前記先端加工部が前記液状化地層と前記非液状化地層の層境をまたぐように配置されることを特徴とする。 The foundation structure according to the present invention is a foundation structure arranged so as to straddle a liquefied formation and a non-liquefied formation, wherein the foundation structure is a footing and a plurality of formations formed integrally with the footing. A base structure penetrating into the base through, an additional footing provided on the footing, and a tip processed steel sheet pile that is arranged along the outer peripheral direction of the additional footing and extends substantially parallel to the base structure, The tip processed steel sheet pile has a web portion, a pair of flange portions continuously formed at both ends of the web portion, and a steel sheet pile body having a joint portion formed on the tip side of the pair of flange portions. A tip working portion having a closed steel material that is joined across the tip ends of the pair of flange portions at the tip portion in the longitudinal direction of the steel sheet pile body to close the open cross section of the steel sheet pile body, and the tip working portion. Is arranged so as to straddle the boundary between the liquefied formation and the non-liquefied formation.

また、本発明に係る基礎構造において、前記先端加工部の先端から前記層境までの長手方向に沿った長さは、前記先端加工部の長手方向に沿った長さの半分以上であると好適である。   Further, in the basic structure according to the present invention, it is preferable that a length along a longitudinal direction from the tip of the tip-processed portion to the layer boundary is half or more of a length along the longitudinal direction of the tip-processed portion. Is.

また、本発明に係る基礎構造において、前記先端加工部の基端から前記層境までの長手方向に沿った長さの、前記先端加工部の幅に対する比は、１以上であると好適である。   Further, in the basic structure according to the present invention, it is preferable that the ratio of the length along the longitudinal direction from the base end of the distal end processed portion to the layer boundary to the width of the distal end processed portion is 1 or more. ..

また、本発明に係る基礎構造において、前記先端加工部の長手方向に沿った長さは換算杭幅の５倍以下であると好適である。   Further, in the basic structure according to the present invention, it is preferable that the length along the longitudinal direction of the tip processed portion is 5 times or less the converted pile width.

また、本発明に係る基礎構造において、前記先端加工部の長手方向に沿った長さは換算杭幅の３倍以下であると好適である。
また、本発明に係る基礎構造において、前記フーチングは、前記増しフーチングの下方に配置されていると好適である。 Further, in the basic structure according to the present invention, it is preferable that the length along the longitudinal direction of the tip processed portion is 3 times or less the converted pile width.
Further, in the basic structure according to the present invention, it is preferable that the footing is arranged below the additional footing.

本発明に係る基礎構造は、先端加工部が地層の境界をまたぐように配置されているので、地震時に強い基礎構造とすることができる。   The foundation structure according to the present invention is arranged so that the tip processed portion straddles the boundary of the stratum, so that the foundation structure can be strong during an earthquake.

本発明の実施形態に係る基礎構造の構成を説明するための図。The figure for demonstrating the structure of the basic structure which concerns on embodiment of this invention. 本発明の本実施形態に係る基礎構造の変形例を説明するための図。The figure for demonstrating the modification of the basic structure which concerns on this embodiment of this invention. 本発明の本実施形態に係る基礎構造の変形例を説明するための図。The figure for demonstrating the modification of the basic structure which concerns on this embodiment of this invention. 本発明の実施形態に係る基礎構造に用いる先端加工鋼矢板を説明するための図。The figure for demonstrating the tip processing steel sheet pile used for the basic structure which concerns on embodiment of this invention. 先端加工鋼矢板の構造を説明するための図。The figure for demonstrating the structure of the tip processed steel sheet pile. 本発明の実施形態に係る基礎構造の上部構造の支持構造を説明するため図。The figure for demonstrating the support structure of the superstructure of the foundation structure which concerns on embodiment of this invention. 図４におけるＡ部拡大図。The A section enlarged view in FIG. 従来の鋼矢板を用いた基礎構造の構成を説明するための図。The figure for demonstrating the structure of the basic structure using the conventional steel sheet pile.

以下、本発明を実施するための好適な実施形態について、図面を用いて説明する。なお、以下の実施形態は、各請求項に係る発明を限定するものではなく、また、実施形態の中で説明されている特徴の組み合わせの全てが発明の解決手段に必須であるとは限らない。   Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. It should be noted that the following embodiments do not limit the invention according to each claim, and all combinations of the features described in the embodiments are not necessarily essential to the solution means of the invention. ..

図１ａは、本発明の実施形態に係る基礎構造の構成を説明するための図であり図１ｂ及び図１ｃは、本発明の本実施形態に係る基礎構造の変形例を説明するための図であり、図２は、本発明の実施形態に係る基礎構造に用いる先端加工鋼矢板を説明するための図であり、図３は、先端加工鋼矢板の構造を説明するための図であり、図４は、本発明の実施形態に係る基礎構造の上部構造の支持構造を説明するため図であり、図５は、図４におけるＡ部拡大図である。   FIG. 1a is a diagram for explaining a configuration of a basic structure according to an embodiment of the present invention, and FIGS. 1b and 1c are diagrams for explaining a modified example of the basic structure according to the present embodiment of the present invention. Yes, FIG. 2 is a diagram for explaining a tip-processed steel sheet pile used for the basic structure according to the embodiment of the present invention, and FIG. 3 is a diagram for explaining a structure of the tip-machined steel sheet pile. 4 is a view for explaining a support structure of a superstructure of a basic structure according to the embodiment of the present invention, and FIG. 5 is an enlarged view of part A in FIG. 4.

図１ａ〜図１ｃに示すように、本実施形態に係る基礎構造１０は、上部構造１を支持する構造体であって、上部構造１を支持するコンクリート製の増しフーチング１１と、該増しフーチング１１の下方に形成されたフーチング１１ａと一体に形成されると共に複数の地層を介して基盤に貫入する複数の基礎構造体２と、増しフーチング１１の外周方向に沿って並ぶと共に基礎構造体２と略平行に延びる先端加工鋼矢板２０とを備えている。なお、基礎構造体２は、杭基礎、ケーソン基礎又は直接基礎など従来から基礎構造に用いられている種々の構造を採用することが可能である。   As shown in FIGS. 1 a to 1 c, a foundation structure 10 according to the present embodiment is a structure that supports the superstructure 1, and is a concrete additional footing 11 that supports the upper structure 1 and the additional footing 11. A plurality of substructures 2 which are formed integrally with the footing 11a formed below the base and penetrate the foundation through a plurality of formations, and are arranged along the outer peripheral direction of the additional footing 11 and are substantially the same as the substructure 2. It is provided with a tip-processed steel sheet pile 20 extending in parallel. The foundation structure 2 can employ various structures conventionally used for foundation structures such as a pile foundation, a caisson foundation, or a direct foundation.

図２に示すように、先端加工鋼矢板２０は、熱間圧延で製造され、断面中央に位置するウェブ部２２と、このウェブ部２２の両端に連続して形成された一対のフランジ部２３，２３と、一対のフランジ部２３，２３の先端側に形成された継手部２４，２４とを備えた鋼矢板本体２１と、鋼矢板本体２１の長手方向先端部における一対のフランジ部２３，２３の先端間に渡って接合され、鋼矢板本体２１の開断面を閉塞する閉合鋼材２５が取り付けられた先端加工部２６とを備えている。   As shown in FIG. 2, the tip-processed steel sheet pile 20 is manufactured by hot rolling, and has a web portion 22 located at the center of the cross section, and a pair of flange portions 23 continuously formed at both ends of the web portion 22, 23 and a pair of flange portions 23, 23 of the steel sheet pile main body 21 provided with joint portions 24, 24 formed on the tip side of the pair of flange portions 23, 23, and a pair of flange portions 23, 23 at the longitudinal end portions of the steel sheet pile body 21. It is provided with a front end processing part 26 to which a closed steel material 25 that is joined across the front ends and closes the open cross section of the steel sheet pile body 21 is attached.

また、図３（ａ）に示すように、先端加工部２６の断面形状は、概略六角形状に形成されており、鋼矢板本体２１と閉合鋼材２５の断面積の和と鋼矢板本体２１と閉合鋼材２５によって形成される閉断面部分の面積の和である先端閉塞面積ＡP及び換算杭幅Ｄpを有している。 Further, as shown in FIG. 3A, the cross-sectional shape of the tip processed portion 26 is formed in a substantially hexagonal shape, and the sum of the cross-sectional areas of the steel sheet pile body 21 and the closed steel material 25 and the steel sheet pile body 21 and the closed state. It has a tip closed area A P and a converted pile width D p , which are the sum of the areas of the closed cross-sections formed by the steel material 25.

さらに、図３（ｂ）に示すように、先端加工部２６の長手方向に沿った長さＬは、換算杭幅ＤPから求められる所定の長さに形成されている。ここで、換算杭幅ＤPは、以下の計算式によって求めることができる。
ＤP＝ＡP 1/2 Further, as shown in FIG. 3B, the length L along the longitudinal direction of the tip processed portion 26 is formed to be a predetermined length obtained from the converted pile width D P. Here, the converted pile width D P can be obtained by the following calculation formula.
D P = A P 1/2

ここで、先端加工部２６の長さＬは、例えば換算杭幅ＤPの５倍程度以下に形成されると好適である。このように換算杭幅ＤPの５倍程度以下に先端加工部２６の長さＬを形成すると、本実施形態に係る基礎構造を液状化地盤に適用することが可能となる。 Here, it is preferable that the length L of the tip processed portion 26 is formed to be, for example, about 5 times or less of the converted pile width D P. In this way, if the length L of the tip processed portion 26 is formed to be about 5 times the converted pile width D P or less, the foundation structure according to the present embodiment can be applied to the liquefied ground.

また、先端加工部２６の長さＬを換算杭幅ＤPの３倍程度以下に形成すると、比較的良好な地盤への適用が可能となり、従来の基礎構造に比べて地震に強い構造物を構築することができる。 Further, if the length L of the tip-end processed portion 26 is formed to be about 3 times or less of the converted pile width D P , it can be applied to relatively good ground, and a structure that is more resistant to earthquakes than a conventional foundation structure can be obtained. Can be built.

さらに、図４に示すように、本実施形態に係る基礎構造１０は、地表面３に形成される構造体であり、上述したように複数の地層３ｂ，３ｃを介して基盤３ａに貫入する複数の基礎構造体２と、基礎構造体２と略平行に延びる先端加工鋼矢板２０とを備えている。このとき、先端加工鋼矢板２０は、基盤３ａに貫入しておらず、第１層３ｂと第２層３ｃの間の層境３ｄに先端加工部２６がまたぐように配置されている。第１層３ｂは基盤３ａの上方に位置する所謂軟弱地盤であり、地震時に液状化を起こす可能性のある液状化地層である。また、第２層３ｃは、同様に基盤３ａの上方に位置する地層であるが、第１層３ｂと異なり液状化しない非液状化地層であり、比較的強度が高めの良好な地層である。このように、本実施形態に係る基礎構造１０は、液状化地層と非液状化地層をまたぐように配置されている。   Further, as shown in FIG. 4, the base structure 10 according to the present embodiment is a structure formed on the ground surface 3, and as described above, a plurality of base structures 3b, 3c penetrating the base 3a. Of the basic structure 2 and a tip-processed steel sheet pile 20 extending substantially parallel to the basic structure 2. At this time, the tip-processed steel sheet pile 20 does not penetrate into the base 3a, and the tip-processed portion 26 is arranged so as to straddle the layer boundary 3d between the first layer 3b and the second layer 3c. The first layer 3b is a so-called soft ground located above the base 3a, and is a liquefied ground layer that may cause liquefaction during an earthquake. Similarly, the second layer 3c is a stratum located above the base 3a, but unlike the first layer 3b, it is a non-liquefied stratum that does not liquefy, and has a relatively high strength. Thus, the foundation structure 10 according to the present embodiment is arranged so as to straddle the liquefied formation and the non-liquefied formation.

図５に示すように、先端加工部２６は、第２層３ｃに先端側が貫入しており、先端加工部２６の先端から層境３ｄまでの長手方向に沿った長さｌ、即ち、先端加工部２６のうち、第２層３ｃに貫入している根入れ深さは、先端加工部２６の長手方向に沿った長さＬの半分以上となるように貫入している。このように先端加工部２６の根入れ深さを設定することで、地震時に水平力Ｆが作用しても鋼矢板が抜けることを防止することができる。   As shown in FIG. 5, the tip processing portion 26 has the tip side penetrating into the second layer 3c, and has a length 1 along the longitudinal direction from the tip of the tip processing portion 26 to the layer boundary 3d, that is, the tip processing. In the portion 26, the rooting depth that penetrates the second layer 3c is half or more of the length L along the longitudinal direction of the tip-processed portion 26. By setting the rooting depth of the tip processed portion 26 in this manner, it is possible to prevent the steel sheet pile from coming off even when the horizontal force F acts during an earthquake.

また、先端加工部２６の基端から層境３ｄまでの長手方向に沿った長さｄ、即ち、先端加工部２６のうち、第１層３ｂに挿入されている部位の長さ（先端加工部２６の第１層３ｂ側に突出している突出量）は、先端加工部２６の幅方向の長さｗとの比ｄ／ｗが１以上となるように設定されている。このように先端加工部２６の突出量を設定することで、例えば図５に示すように地盤変化による応力を受けた場合に、鋼矢板内で当該応力が４５°分散しても鋼矢板本体２１と先端加工部２６の連続点に応力が集中することを防止することができ、応力分散を適切に行うことができる。   Further, the length d along the longitudinal direction from the base end of the tip processing portion 26 to the layer boundary 3d, that is, the length of the portion of the tip processing portion 26 that is inserted into the first layer 3b (the tip processing portion). The amount of protrusion of 26 toward the side of the first layer 3b) is set so that the ratio d / w to the length w in the width direction of the tip processing portion 26 is 1 or more. By setting the protrusion amount of the tip processed portion 26 in this manner, for example, when a stress due to ground change is applied as shown in FIG. 5, even if the stress is dispersed 45 ° in the steel sheet pile, the steel sheet pile main body 21 It is possible to prevent the stress from concentrating on the continuous points of the tip processed portion 26, and it is possible to appropriately disperse the stress.

このように、先端加工部２６が層境３ｄをまたぐように配置されているので、地震などの発生時に水平力Ｆを受けて地盤の変化が生じた場合であっても、層境３ｄに先端加工部２６が存在することで基礎構造体２の変形を抑制して地盤の変化に強い基礎構造を構築することができる。   In this way, since the tip processing portion 26 is arranged so as to cross the layer boundary 3d, even if the ground changes due to the horizontal force F at the time of occurrence of an earthquake or the like, the tip is located at the layer boundary 3d. Due to the presence of the processed portion 26, it is possible to suppress the deformation of the foundation structure 2 and construct a foundation structure that is resistant to changes in the ground.

なお、上述した実施形態に係る基礎構造１０は、先端加工部が液状化地層と非液状化地層の層境をまたぐように配置されれば先端加工鋼矢板の形状は棒状に限定されず、種々の形状を採用することができる。例えば、上述した実施形態に係る基礎構造１０は、先端加工部２６が液状化地層である第１層３ｂと非液状化地層である第２層３ｃとの層境３ｄをまたぐように配置した場合について説明をおこなったが、地層の数はこれに限定されず、例えば、液状化地層である第１層３ｂと複数の地層及び層境を介して比較的強度が高めの良好な地層である非液状化地層である第２層３ｃに貫入するように配置しても構わない。   In the basic structure 10 according to the above-described embodiment, the tip processed steel sheet pile is not limited to the rod shape as long as the tip processed portion is arranged so as to cross the boundary between the liquefied formation and the non-liquefied formation. The shape of can be adopted. For example, in the basic structure 10 according to the above-described embodiment, when the tip processing portion 26 is arranged so as to straddle the layer boundary 3d between the first layer 3b which is the liquefied formation and the second layer 3c which is the non-liquefied formation. However, the number of formations is not limited to this. For example, the formation is a good formation having relatively high strength through the first layer 3b which is a liquefied formation and a plurality of formations and boundary layers. You may arrange | position so that it may penetrate into the 2nd layer 3c which is a liquefied formation.

また、上述した実施形態に係る基礎構造では、先端加工鋼矢板２０は、図１ａに示すように周方向に全周にわたって配置した場合について説明を行ったが、先端加工鋼矢板２０は、全周に配置することに限らず、例えば、図１ｂに示すように周方向に一枚おきに配置しても構わない。また、図１ｃに示すように、通常の鋼矢板２０ａは、先端加工鋼矢板２０よりも長さを短く形成しても構わない。   Further, in the basic structure according to the above-described embodiment, the tip processed steel sheet pile 20 is described as being arranged over the entire circumference in the circumferential direction as shown in FIG. 1a. The arrangement is not limited to the above, but may be arranged every other sheet in the circumferential direction, for example, as shown in FIG. 1b. Moreover, as shown in FIG. 1c, the normal steel sheet pile 20a may be formed to have a shorter length than the tip processed steel sheet pile 20.

また、上述した実施形態に係る基礎構造では、先端加工鋼矢板２０は、断面形状が所謂ハット形鋼矢板で構成した場合について説明を行ったが、先端加工鋼矢板２０の断面形状はこれに限られず、例えば、断面形状をＵ字形やハ字形に形成しても構わない。その様な変更又は改良を加えた形態も本発明の技術的範囲に含まれうることが、特許請求の範囲の記載から明らかである。   Further, in the basic structure according to the above-described embodiment, the case where the tip processed steel sheet pile 20 is configured by a so-called hat-shaped steel sheet pile has been described, but the cross-sectional shape of the tip processed steel sheet pile 20 is not limited to this. Alternatively, for example, the cross-sectional shape may be formed in a U shape or a C shape. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

１ 上部構造
２ 基礎構造体
３ 地表面
３ａ 基盤
３ｂ 第１層
３ｃ 第２層
３ｄ 層境
１０ 基礎構造
１１ 増しフーチング
１１ａ フーチング
２０ 先端加工鋼矢板
２１，１２１ 鋼矢板本体
２２ ウェブ部
２３ フランジ部
２４ 継手部
２５ 閉合鋼材
２６ 先端加工部
Ｌ 先端加工部長さ
ＡP 先端閉塞面積
ＤP 換算杭幅
ｄ 第１層側の突出量
ｌ 根入れ深さ
ｗ 幅方向長さ
Ｆ 水平力
１０１ 上側の地層
１０２ 基盤
１０３ 地層境界
１２６ 閉合鋼材 1 Superstructure 2 Foundation structure 3 Ground surface 3a Base 3b 1st layer 3c 2nd layer 3d Layer boundary 10 Foundation structure 11 Additional footing 11a Footing 20 Tip processed steel sheet pile 21, 121 Steel sheet pile body 22 Web portion 23 Flange portion 24 Joint Part 25 Closed steel 26 Tip processed part L Tip processed part length A P Tip closed area D P converted pile width d 1st layer side protrusion amount 1 Insertion depth w Width direction length F Horizontal force 101 Upper formation 102 Base 103 Stratum boundary 126 Closed steel

Claims (6)

液状化地層と非液状化地層をまたぐように配置される基礎構造であって、
前記基礎構造は、フーチングと、該フーチングに一体に形成されると共に複数の地層を介して基盤に貫入された基礎構造体と、前記フーチングに設けられた増しフーチングと、該増しフーチングの外周方向に沿って並ぶと共に前記基礎構造体と略平行に延びる先端加工鋼矢板とを備え、
前記先端加工鋼矢板は、ウェブ部と、該ウェブ部の両端に連続して形成された一対のフランジ部と、これら一対のフランジ部の先端側に形成された継手部を有した鋼矢板本体と、該鋼矢板本体の長手方向先端部における前記一対のフランジ部の先端間に渡って接合され、該鋼矢板本体の開断面を閉塞する閉合鋼材を有する先端加工部が形成され、前記先端加工部が前記液状化地層と前記非液状化地層の層境をまたぐように配置されることを特徴とする基礎構造。 A basic structure that is arranged so as to straddle a liquefied formation and a non-liquefied formation,
The foundation structure includes a footing, a foundation structure formed integrally with the footing and penetrating the foundation through a plurality of formations, an additional footing provided in the footing, and an outer peripheral direction of the additional footing. With tip processed steel sheet piles extending substantially parallel to the basic structure while being lined up,
The tip processed steel sheet pile has a web portion, a pair of flange portions continuously formed at both ends of the web portion, and a steel sheet pile body having a joint portion formed on the tip side of the pair of flange portions. A tip working portion having a closed steel material that is joined across the tip ends of the pair of flange portions at the tip portion in the longitudinal direction of the steel sheet pile body to close the open cross section of the steel sheet pile body, and the tip working portion. Is arranged so as to straddle the boundary between the liquefied formation and the non-liquefied formation. 請求項１に記載の基礎構造において、
前記先端加工部の先端から前記層境までの長手方向に沿った長さは、前記先端加工部の長手方向に沿った長さの半分以上であることを特徴とする基礎構造。 In the basic structure according to claim 1,
The basic structure, wherein the length along the longitudinal direction from the tip of the tip processing portion to the layer boundary is half or more of the length along the longitudinal direction of the tip processing portion. 請求項１又は２に記載の基礎構造において、
前記先端加工部の基端から前記層境までの長手方向に沿った長さの、前記先端加工部の幅に対する比は、１以上であることを特徴とする基礎構造。 In the basic structure according to claim 1 or 2,
The basic structure, wherein the ratio of the length along the longitudinal direction from the base end of the tip processing portion to the layer boundary to the width of the tip processing portion is 1 or more. 請求項１から３のいずれか１項に記載の基礎構造において、
前記先端加工部の長手方向に沿った長さは換算杭幅の５倍以下であることを特徴とする基礎構造。 The foundation structure according to any one of claims 1 to 3,
The length along the longitudinal direction of the tip processed portion is 5 times or less the converted pile width, which is a basic structure. 請求項１から３のいずれか１項に記載の基礎構造において、
前記先端加工部の長手方向に沿った長さは換算杭幅の３倍以下であることを特徴とする基礎構造。 The foundation structure according to any one of claims 1 to 3,
A basic structure characterized in that the length along the longitudinal direction of the tip processed portion is not more than 3 times the converted pile width. 請求項１から５のいずれか１項に記載の基礎構造において、  The foundation structure according to any one of claims 1 to 5,
前記フーチングは、前記増しフーチングの下方に配置されていることを特徴とする基礎構造。  The foundation structure, wherein the footing is arranged below the additional footing.
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