JP5177603B2 - Combined steel sheet pile wall - Google Patents

Combined steel sheet pile wall Download PDF

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JP5177603B2
JP5177603B2 JP2011549366A JP2011549366A JP5177603B2 JP 5177603 B2 JP5177603 B2 JP 5177603B2 JP 2011549366 A JP2011549366 A JP 2011549366A JP 2011549366 A JP2011549366 A JP 2011549366A JP 5177603 B2 JP5177603 B2 JP 5177603B2
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sheet pile
steel sheet
main body
steel
earth pressure
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JPWO2011132489A1 (en
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直也 永尾
宏征 田中
彰久 亀山
輝樹 西山
政信 岡本
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Nippon Steel Corp
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/02Sheet piles or sheet pile bulkheads
    • E02D5/03Prefabricated parts, e.g. composite sheet piles
    • E02D5/04Prefabricated parts, e.g. composite sheet piles made of steel

Description

本発明は、土留め壁、護岸壁、擁壁等の地中連続壁に用いられる組合せ鋼矢板壁に関するものである。   The present invention relates to a combined steel sheet pile wall used for underground continuous walls such as earth retaining walls, revetment walls and retaining walls.

土留め壁等として鋼矢板を一列に連結して設けられる鋼矢板壁が用いられている。また、前記鋼矢板に、例えば、H形鋼やT形鋼などの形鋼を固定して補剛した組合せ鋼矢板およびこの組合せ鋼矢板を用いた組合せ鋼矢板壁が知られている(例えば、特許文献1,2参照)。例えば、図17に示すように、鋼矢板本体(ハット形鋼矢板)1は、ウェブ2とその左右側縁にそれぞれウェブ2に対して斜めで互いに広がるように設けられたフランジ3と、2つのフランジ3の先端部にそれぞれウェブ2に対して略平行に設けられたアーム4と、2つのアーム4の先端にそれぞれ設けられた継手5とを備えている。そして、継手5同士を繋ぐことにより、複数の鋼矢板本体1を連結して鋼矢板壁を構築可能となっている。この鋼矢板本体1のウェブ2に、ウェブ6の両端にそれぞれウェブ6に対して直角にフランジ7を設けてなるH形鋼8の一方のフランジ7の両側縁部をそれぞれ溶接することにより、組合せ鋼矢板9が構成される。   A steel sheet pile wall provided by connecting steel sheet piles in a row as a retaining wall or the like is used. Further, for example, a combination steel sheet pile obtained by fixing and stiffening a shape steel such as an H-shaped steel or a T-shaped steel to the steel sheet pile, and a combination steel sheet pile wall using this combination steel sheet pile are known (for example, (See Patent Documents 1 and 2). For example, as shown in FIG. 17, a steel sheet pile main body (hat-shaped steel sheet pile) 1 includes a web 2 and flanges 3 provided on the left and right side edges thereof so as to spread obliquely with respect to the web 2. An arm 4 provided substantially parallel to the web 2 at the tip of the flange 3 and a joint 5 provided at the tip of the two arms 4 are provided. And the steel sheet pile wall can be constructed by connecting the plurality of steel sheet pile main bodies 1 by connecting the joints 5 to each other. The web 2 of the steel sheet pile main body 1 is combined by welding both side edges of one flange 7 of an H-shaped steel 8 provided with flanges 7 at both ends of the web 6 at right angles to the web 6 respectively. A steel sheet pile 9 is constructed.

前記組合せ鋼矢板9を用いた組合せ鋼矢板壁においては、鋼矢板本体1と例えばH形鋼8が略全長に渡って溶接されているので、図18(a)に示すように、土圧等により、組合せ鋼矢板9が変形する場合に、これらが上下方向にずれることがなく一体に変形し、大きな断面剛性を得ることができるが、以下のような問題がある。例えば、鋼矢板本体1の略全長に渡って連続的もしくは断続的に溶接により形鋼が固定されていることから、溶接の手間がかかる。また、溶接による熱影響で鋼矢板本体1に歪みが生じる虞があり、溶接方法を工夫したり、溶接の温度管理等の加工管理を行ったり、溶接後に歪みを確認するために形状測定を行ったり、歪が生じている場合に矯正作業を行ったりする必要があり、これに費やす手間やコストが問題となる。   In the combined steel sheet pile wall using the combined steel sheet pile 9, since the steel sheet pile main body 1 and, for example, the H-shaped steel 8 are welded over substantially the entire length, as shown in FIG. Thus, when the combined steel sheet pile 9 is deformed, they are deformed integrally without shifting in the vertical direction, and a large cross-sectional rigidity can be obtained, but there are the following problems. For example, since the shape steel is fixed by welding continuously or intermittently over substantially the entire length of the steel sheet pile main body 1, it takes time and effort for welding. In addition, there is a possibility that the steel sheet pile main body 1 may be distorted due to the heat effect of welding, and devise the welding method, perform processing management such as temperature management of welding, or perform shape measurement to confirm the distortion after welding. If the distortion occurs, it is necessary to carry out a correction work, and the labor and cost spent for this becomes a problem.

また、鋼矢板本体1に形鋼を溶接した状態で地盤中に埋設する場合に、地盤の抵抗が大きくなるという問題がある。また、工場等で鋼矢板本体1に形鋼を溶接した後に施工現場に運送する場合に、鋼矢板本体1単独の場合に比較して組合せ鋼矢板9は嵩張る形状となっており、一度に運送できる数が限られ、運送効率が悪いという問題がある。   Moreover, when it embed | buries in the ground in the state which welded the shape steel to the steel sheet pile main body 1, there exists a problem that the resistance of a ground becomes large. In addition, when a steel sheet pile main body 1 is welded to a construction site after being transported to a construction site in a factory or the like, the combined steel sheet pile 9 has a bulky shape compared to the case of the steel sheet pile main body 1 alone, and is transported at one time. There is a problem that the number that can be done is limited and the transportation efficiency is poor.

そこで、鋼矢板本体に対して、例えば、H形鋼を全長に渡って溶接せずに、鋼矢板本体にH形鋼のフランジに係合する係合片を設けて係合させた組合せ鋼矢板が提案されている(例えば、特許文献3参照)。また、鋼矢板本体に対してH形鋼を全長に渡って溶接せずに、鋼矢板本体とH形鋼の一方の端部どうしだけを溶接やボルト接合等により固定した組合せ鋼矢板が提案されている(例えば、特許文献4参照)。   Therefore, for example, a combined steel sheet pile that is engaged with a steel sheet pile main body by providing an engagement piece that engages a flange of the H-shaped steel without welding the H-shaped steel over the entire length. Has been proposed (see, for example, Patent Document 3). In addition, a combined steel sheet pile in which only one end of the steel sheet pile main body and the H-section steel is fixed to each other by welding or bolt joining without welding the H-section steel to the steel sheet pile main body over the entire length is proposed. (For example, see Patent Document 4).

これらの組合せ鋼矢板を用いた組合せ鋼矢板壁では、H形鋼と鋼矢板本体が全長にわたっては一体になっていないが、図18(b)に示すように、互いの接触する面で上下にずれが生じた状態でH形鋼8と鋼矢板本体1のたわみ挙動が同じになり、重ね梁式の組合せ鋼矢板として断面剛性の向上を図ることができる。   In the combined steel sheet pile wall using these combined steel sheet piles, the H-shaped steel and the steel sheet pile main body are not integrated over the entire length, but as shown in FIG. The deflection behavior of the H-section steel 8 and the steel sheet pile main body 1 becomes the same in a state where the deviation occurs, and the cross section rigidity can be improved as a laminated beam type combined steel sheet pile.

上述の全長に渡って溶接された組合せ鋼矢板9を用いた組合せ鋼矢板壁に比較すると、断面剛性は及ばないものの、溶接加工、加工管理、形状測定、矯正作業に費やす手間やコストを削減することが可能となる。また、現場でH形鋼8および鋼矢板本体1を接合したり、地盤中に埋設する際に、鋼矢板本体1とH形鋼8を別々に施工したりすることも可能であり、H形鋼8と鋼矢板本体1を別々に荷造りして運送効率の向上を図ったり、鋼矢板本体1およびH形鋼8の打設や圧入等に際して地盤抵抗の減少を図ったりすることができる。   Compared to the combined steel sheet pile wall using the combined steel sheet pile 9 welded over the entire length described above, although the cross-sectional rigidity does not reach, it reduces the labor and cost spent on welding, processing management, shape measurement, and correction work It becomes possible. Moreover, when joining the H-section steel 8 and the steel sheet pile main body 1 at the site, or embedding it in the ground, it is possible to construct the steel sheet pile main body 1 and the H-section steel 8 separately. The steel 8 and the steel sheet pile main body 1 can be separately packed to improve the transport efficiency, or the ground resistance can be reduced when the steel sheet pile main body 1 and the H-section steel 8 are placed or press-fitted.

以上のような重ね梁式組合せ鋼矢板壁では、必ずしも鋼矢板本体1とH形鋼8が係合していたり、一端部同士が固定されていなくても、変形時に上述のようにずれが生じるが、互いに離れない状態となっていることで、断面剛性の向上を図ることができる。   In the above laminated beam type combined sheet pile wall, even when the steel sheet pile main body 1 and the H-section steel 8 are not necessarily engaged or one end portions are not fixed to each other, a shift occurs as described above at the time of deformation. However, since it is in a state where they are not separated from each other, the cross-sectional rigidity can be improved.

特許3603793号公報Japanese Patent No. 3603793 特開2008−175029号公報JP 2008-175029 A 特開2005−299202号公報JP-A-2005-299202 特開2008−267069号公報JP 2008-267069 A

ところで、特許文献3,4の組合せ鋼矢板や、或いは図19に示すように係合も接合もされていない鋼矢板本体1およびH形鋼8を用いて、図20に示すように鋼矢板壁11を構築し、例えば、土留め壁とした場合に、土留めされる土砂側、すなわち土圧(図中において矢印で示す。)がかかる側(相対的に土圧が高い側)にH形鋼8を配置すると、H形鋼8に土圧が作用するだけではなく、H形鋼8どうしの間から鋼矢板本体1にも直接大きな土圧が作用してしまう。このように鋼矢板本体1に直接大きな土圧が作用すると、鋼矢板本体1をH形鋼8から引き離す力が作用するとともに、鋼矢板本体1とH形鋼8とでたわみ挙動が異なってしまう虞がある。   By the way, the steel sheet pile wall as shown in FIG. 20 using the steel sheet pile main body 1 and the H-shaped steel 8 which are not engaged and joined as shown in FIG. 11 is constructed, for example, when it is used as a retaining wall, the earth-and-sand side to be retained, that is, the side on which the earth pressure (indicated by an arrow in the figure) is applied (the side where the earth pressure is relatively high) is H-shaped. When the steel 8 is arranged, not only the earth pressure acts on the H-shaped steel 8 but also a large earth pressure acts directly on the steel sheet pile main body 1 between the H-shaped steels 8. When a large earth pressure acts directly on the steel sheet pile main body 1 in this way, a force that separates the steel sheet pile main body 1 from the H-section steel 8 acts, and the deflection behavior differs between the steel sheet pile main body 1 and the H-section steel 8. There is a fear.

鋼矢板本体1とH形鋼8が離れて、たわみ挙動が異なった状態となると、H形鋼8による補剛の効果がなくなってしまう。したがって、基本的に、特許文献2,3の組合せ鋼矢板を用いた鋼矢板壁11や図19の構成を用いた鋼矢板壁11において、H形鋼8を鋼矢板本体1に対して土圧がかかる側に配置するのは困難である。特許文献2の組合せ鋼矢板の場合に、鋼矢板本体1とH形鋼8とが全長に渡って係合部材によって係合しているので、この係合部分の構造や強度によっては、鋼矢板本体1に対してH形鋼8を土圧がかかる側に配置することが可能となる場合もあるが、係合部材の一体成形や、係合部材の鋼矢板への接合等にコストがかかる。   If the steel sheet pile main body 1 and the H-section steel 8 are separated from each other and the bending behavior is different, the stiffening effect by the H-section steel 8 is lost. Therefore, basically, in the steel sheet pile wall 11 using the combination steel sheet pile of Patent Documents 2 and 3, and the steel sheet pile wall 11 using the configuration of FIG. It is difficult to arrange on the side where the In the case of the combined steel sheet pile of Patent Document 2, the steel sheet pile main body 1 and the H-shaped steel 8 are engaged by the engagement member over the entire length, and depending on the structure and strength of this engagement portion, the steel sheet pile Although it may be possible to arrange the H-shaped steel 8 on the side where the earth pressure is applied to the main body 1, it is costly to integrally form the engaging member, join the engaging member to the steel sheet pile, and the like. .

本発明は、鋼矢板本体とH形鋼等の形鋼が略全長に渡って固定されていない重ね梁式の構造となっていても、H形鋼を鋼矢板に対して土圧がかかる側に配置可能な組合せ鋼矢板および組合せ鋼矢板壁を提供することを目的とする。   In the present invention, even if the steel sheet pile main body and the shape steel such as the H-shaped steel are not fixed over the entire length, the H-shaped steel is subjected to earth pressure on the steel sheet pile. It is an object of the present invention to provide a combination steel sheet pile and a combination steel sheet pile wall that can be arranged on the wall.

前記課題を解決するために、請求項1に記載の組合せ鋼矢板壁は、鋼矢板本体と、当該鋼矢板本体に実質的に接触して当該鋼矢板本体の軸方向に沿って配置される長尺な補剛材とを備え、前記鋼矢板本体を隣接する前記鋼矢板本体と継手を介して連続して配置することで構築する組合せ鋼矢板壁であって、
前記鋼矢板本体と前記補剛材とは略全長に渡る固定はされておらず、
前記補剛材は、前記連続配置した鋼矢板本体により仕切られた二つの区域のうちの相対的に土圧の高い区域側に配置され、
前記補剛材は、前記鋼矢板本体に実質的に接触する矢板接触部と、前記矢板接触部から離れた位置に設けられる土圧受け部と、これら矢板接触部および土圧受け部の間にあってこれら矢板接触部および土圧受け部を接続された状態とする接続部とを備え、前記土圧受け部の左右幅が、前記矢板接触部の左右幅より広くなっていることを特徴とする。
In order to solve the above-mentioned problem, the combined steel sheet pile wall according to claim 1 is a steel sheet pile main body and a length that is substantially in contact with the steel sheet pile main body and arranged along the axial direction of the steel sheet pile main body. A steel sheet pile body that is constructed by continuously arranging the steel sheet pile main body via the steel sheet pile main body and the joint adjacent to each other,
The steel sheet pile main body and the stiffener are not fixed over substantially the entire length,
The stiffener is arranged on the relatively high earth pressure side of the two areas partitioned by the continuously arranged steel sheet pile main bodies,
The stiffener is between a sheet pile contact portion that substantially contacts the steel sheet pile main body, an earth pressure receiving portion provided at a position away from the sheet pile contact portion, and between the sheet pile contact portion and the earth pressure receiving portion. The sheet pile contact part and the connection part which makes the earth pressure receiving part the state connected are provided, The left-right width of the earth pressure receiving part is wider than the left-right width of the sheet pile contact part, It is characterized by the above-mentioned.

請求項1に記載の発明においては、補剛材の土圧受け部の左右幅が、この土圧受け部を有する補剛材と前記鋼矢板本体とが同等にたわむことが可能なように前記土圧受け部に土圧が作用するように、前記補剛材の矢板接触部の左右幅より広くなっているので、土圧により補剛材から鋼矢板本体が離されることがなく、鋼矢板本体と補剛材とのたわみ挙動を同じ状態とすることが可能になる。   In the invention according to claim 1, the lateral width of the earth pressure receiving portion of the stiffener is such that the stiffener having the earth pressure receiving portion and the steel sheet pile main body can be flexed equally. Since the width of the sheet pile contact portion of the stiffener is wider than the width of the sheet pile contact portion so that earth pressure acts on the earth pressure receiving portion, the steel sheet pile main body is not separated from the stiffener by earth pressure. It becomes possible to make the bending behavior of the main body and the stiffener the same.

したがって、特許文献1、2のように鋼矢板本体と補剛材とを一体に固定しなくても、重ね梁方式による鋼矢板本体の補剛をすることが可能となる。この構造では、例えば、鋼矢板本体と補剛材とを全長に渡って溶接した場合の上述の問題は生じない。また、組合せ鋼矢板壁を土留め壁等とした場合に、補剛材が地盤から露出されない側に配置されることにより、鋼矢板壁のスペース効率を向上することが可能となるとともに施工外観上も好ましい。   Therefore, it is possible to stiffen the steel sheet pile main body by the overlap beam method without fixing the steel sheet pile main body and the stiffener integrally as in Patent Documents 1 and 2. In this structure, for example, the above-described problem when the steel sheet pile main body and the stiffener are welded over the entire length does not occur. In addition, when the combined steel sheet pile wall is a retaining wall, etc., it is possible to improve the space efficiency of the steel sheet pile wall by arranging the stiffener on the side that is not exposed from the ground, and on the construction appearance. Is also preferable.

請求項2に記載の組合せ鋼矢板壁は、請求項1に記載の鋼矢板壁において、前記補剛材はH形鋼からなり、当該H形鋼の一方のフランジが前記矢板接触部とされ、他方のフランジが土圧受け部とされ、ウェブが接続部とされ、前記一方のフランジより前記他方のフランジの幅が広くされていることを特徴とする。   The combined steel sheet pile wall according to claim 2 is the steel sheet pile wall according to claim 1, wherein the stiffener is made of H-shaped steel, and one flange of the H-shaped steel is the sheet pile contact portion, The other flange is the earth pressure receiving portion, the web is the connecting portion, and the width of the other flange is wider than the one flange.

請求項2に記載の発明においては、補剛材として、フランジの幅が異なるH形鋼を用いる。このようなH形鋼をそのまま補剛材として用いることで、部品点数および施工工数の削減を図ることができる。   In the invention described in claim 2, H-shaped steel having different flange widths is used as the stiffener. By using such an H-shaped steel as a stiffener as it is, the number of parts and the number of construction steps can be reduced.

請求項3に記載の組合せ鋼矢板壁は、請求項1に記載の鋼矢板壁において、前記補剛材は、矢板接触部材と土圧受け部材とを備え、前記矢板接触部材は、前記矢板接触部および接続部を備え、前記土圧受け部材は前記土圧受け部を備えていることを特徴とする。   The combined steel sheet pile wall according to claim 3 is the steel sheet pile wall according to claim 1, wherein the stiffener includes a sheet pile contact member and an earth pressure receiving member, and the sheet pile contact member is the sheet pile contact. The earth pressure receiving member is provided with the earth pressure receiving part.

請求項3に記載の発明においては、例えば、矢板接触部材としてH形鋼やI形鋼や溝形鋼等の形鋼を用いてこれを鋼矢板本体に接触させ、この形鋼とは別部材の幅の広い土圧受け部材を形鋼に取り付ける(接触する)ことで、すなわち、通常の形鋼に幅の広い土圧受け部材を組み合わせることで、補剛材とすることができる。   In the invention according to claim 3, for example, a shape steel such as an H-shaped steel, an I-shaped steel or a grooved steel is used as a sheet pile contact member, and this is brought into contact with the steel sheet pile main body, and is a separate member from the shape steel. By attaching (contacting) a wide earth pressure receiving member to the shape steel, that is, by combining a wide earth pressure receiving member with a normal shape steel, a stiffener can be obtained.

請求項4に記載の組合せ鋼矢板壁は、請求項3に記載の鋼矢板壁において、前記矢板接触部材がH形鋼であり、前記土圧受け部材が鋼板、形鋼または鋼矢板のいずれかであることを特徴とする。   The combined steel sheet pile wall according to claim 4 is the steel sheet pile wall according to claim 3, wherein the sheet pile contact member is H-shaped steel, and the earth pressure receiving member is any one of a steel plate, a section steel, and a steel sheet pile. It is characterized by being.

請求項4に記載の発明においては、建築資材として広範に使用され、各種のサイズ、強度等のものを容易に調達可能なH形鋼を補剛材の矢板接触部材として用いるとともに、土圧受け部材をH形鋼のフランジとは別に設けることで、例えば、H形鋼のフランジの一方を加工するなどして一対のフランジの幅が互いに異なるH形鋼を設けなくても、矢板接触部材に対して土圧受け部材の幅を広くすることができる。なお、鋼板は、形鋼としての平鋼であってもよい。   In the invention described in claim 4, the H-shaped steel, which is widely used as a building material and can be easily procured in various sizes and strengths, is used as a stiffener sheet pile contact member, By providing the member separately from the flange of the H-section steel, for example, by processing one of the flanges of the H-section steel, the sheet pile contact member can be provided without providing the H-section steel having a pair of different flange widths. On the other hand, the width of the earth pressure receiving member can be increased. The steel plate may be a flat steel as a shape steel.

請求項5に記載の組合せ鋼矢板壁は、請求項1から請求項4のいずれか1項に記載の鋼矢板壁において、前記土圧受け部の左右幅が、前記鋼矢板本体の有効幅以下であることを特徴とする。   The combined steel sheet pile wall according to claim 5 is the steel sheet pile wall according to any one of claims 1 to 4, wherein a lateral width of the earth pressure receiving portion is equal to or less than an effective width of the steel sheet pile main body. It is characterized by being.

請求項5に記載の発明においては、土圧受け部の左右幅を鋼矢板本体の有効幅以下とすることで、鋼材使用量が少なくて済みコストを低減することができる。本発明の組合せ鋼矢板壁では、土圧受け部を有する補剛材と前記鋼矢板本体とが同等にたわむことが可能なように前記土圧受け部に土圧が作用すればよく、そのためには、隣り合う土圧受け部どうしは、端部が接触したりまたはその一部が重なり合う必要は必ずしもなく、ある程度の間隔が空いていてもよい。なお、鋼矢板本体の有効幅とは、鋼矢板本体の左右幅から左右で隣り合う鋼矢板本体の継手と重なり合う部分の半分の幅を除いたものである。   In invention of Claim 5, the amount of steel materials used can be reduced and cost can be reduced by making the left-right width of the earth pressure receiving part below the effective width of the steel sheet pile main body. In the combined steel sheet pile wall of the present invention, it is sufficient that earth pressure acts on the earth pressure receiving portion so that the stiffener having the earth pressure receiving portion and the steel sheet pile main body can be bent equally. The adjacent earth pressure receiving portions do not necessarily have to be in contact with each other or overlap with each other, and may be spaced apart to some extent. In addition, the effective width of the steel sheet pile main body is obtained by excluding the half width of the portion overlapping the joint of the steel sheet pile main body adjacent to the left and right from the left and right width of the steel sheet pile main body.

請求項6に記載の組合せ鋼矢板壁は、請求項5に記載の組合せ鋼矢板壁において、前記土圧受け部の左右幅Xは、次式(a)および(b)の条件を満たすことを特徴とする。   The combined steel sheet pile wall according to claim 6 is the combined steel sheet pile wall according to claim 5, wherein the lateral width X of the earth pressure receiving portion satisfies the conditions of the following expressions (a) and (b): Features.

Figure 0005177603
Figure 0005177603

請求項7に記載の組合せ鋼矢板壁は、請求項5に記載の組合せ鋼矢板壁において、前記土圧受け部の左右幅Xは、次式(c)の条件を満たすことを特徴とする。   The combination steel sheet pile wall according to claim 7 is the combination steel sheet pile wall according to claim 5, characterized in that a lateral width X of the earth pressure receiving portion satisfies a condition of the following expression (c).

Figure 0005177603
Figure 0005177603

請求項6および請求項7に記載の発明においては、土圧受け部の左右幅を各請求項に記載の式で表わされる範囲とすることで、隣り合う土圧受け部どうしの端部が接触したりまたはその一部が重なり合わなくとも、より確実に補剛材と鋼矢板本体とが同等にたわむように土圧を作用させることができると考えられる。   In the invention according to claim 6 and claim 7, by making the left and right width of the earth pressure receiving part a range represented by the formulas described in each claim, the ends of adjacent earth pressure receiving parts are in contact with each other. It is considered that the earth pressure can be applied so that the stiffener and the steel sheet pile main body bend more evenly even if they do not overlap or part of them overlap.

本発明によれば、鋼矢板本体とこれを補剛する形鋼等の補剛材とからなる組合せ鋼矢板壁を構築するに際し、鋼矢板本体と補剛材とを略全長に渡って固定せずに、補剛材を鋼矢板壁の土圧を受ける側や相対的に土圧が高い側に配置しても、土圧により補剛材から鋼矢板本体が引き離されることがなく、重ね梁式組合せ鋼矢板壁として断面剛性を向上することができる。   According to the present invention, when constructing a combined steel sheet pile wall composed of a steel sheet pile body and a stiffener such as a shape steel to stiffen the steel sheet pile body, the steel sheet pile body and the stiffener are fixed over substantially the entire length. Even if the stiffener is placed on the side of the steel sheet pile wall where the earth pressure is received or on the side where the earth pressure is relatively high, the steel sheet pile body is not pulled away from the stiffener by the earth pressure. As a combined steel sheet pile wall, the cross-sectional rigidity can be improved.

本発明の第1実施形態に係る組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall which concerns on 1st Embodiment of this invention. 本発明の第2実施形態に係る組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall which concerns on 2nd Embodiment of this invention. 本発明の第3実施形態に係る組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall which concerns on 3rd Embodiment of this invention. 第3実施形態の変形例となる組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall used as the modification of 3rd Embodiment. 第3実施形態の別の変形例となる組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall used as another modification of 3rd Embodiment. 第3実施形態のさらに別の変形例となる組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall used as another modification of 3rd Embodiment. 本発明の第4実施形態に係る組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall which concerns on 4th Embodiment of this invention. 第4実施形態の変形例となる組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall used as the modification of 4th Embodiment. 本発明の第5実施形態に係る組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall which concerns on 5th Embodiment of this invention. 本発明の第6実施形態に係る組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall which concerns on 6th Embodiment of this invention. 本発明の第7実施形態に係る組合せ鋼矢板壁を示す平面図である。It is a top view which shows the combination steel sheet pile wall which concerns on 7th Embodiment of this invention. 土圧受け部の好ましい幅の算出方法を説明するための図である。It is a figure for demonstrating the calculation method of the preferable width | variety of an earth pressure receiving part. 土圧受け部の好ましい幅の算出方法を説明するための図である。It is a figure for demonstrating the calculation method of the preferable width | variety of an earth pressure receiving part. 土圧受け部の好ましい幅の算出方法を説明するための図である。It is a figure for demonstrating the calculation method of the preferable width | variety of an earth pressure receiving part. 土圧受け部の好ましい幅の算出方法を説明するための図である。It is a figure for demonstrating the calculation method of the preferable width | variety of an earth pressure receiving part. 土圧受け部の好ましい幅の別の算出方法を説明するための図である。It is a figure for demonstrating another calculation method of the preferable width | variety of an earth pressure receiving part. 従来の組合せ鋼矢板を示す斜視図である。It is a perspective view which shows the conventional combination steel sheet pile. 従来の組合せ鋼矢板壁と重ね梁式組合せ鋼矢板壁の作用を説明するための図である。It is a figure for demonstrating the effect | action of the conventional combination steel sheet pile wall and a laminated beam type combination steel sheet pile wall. 従来の重ね梁式組合せ鋼矢板壁(の一部)を示す斜視図である。It is a perspective view which shows the conventional laminated beam type | formula combined steel sheet pile wall (part). 従来の重ね梁式組合せ鋼矢板を示す平面図である。It is a top view which shows the conventional laminated beam type | formula combination steel sheet pile.

以下、本発明の実施形態を図面に基づいて説明する。
図1は、本発明の第1実施形態を示す図である。
図1に示すように、この例の組合せ鋼矢板壁26は、従来と同様のハット形の鋼矢板本体1と、鋼矢板本体1を補剛する補剛材として機能し、一対のフランジ22,23の左右幅が異なるH形鋼24とからなるものである。鋼矢板本体1は、上述のように、ウェブ2、フランジ3、アーム4および継手5を備えており、隣接する鋼矢板本体1と継手5を介して接続されている。H形鋼24は、ウェブ25の両端部にそれぞれ相対的に左右幅(フランジ幅)の狭いフランジ22と、このフランジ22より左右幅の広いフランジ23とを備えている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a first embodiment of the present invention.
As shown in FIG. 1, the combined steel sheet pile wall 26 of this example functions as a hat-shaped steel sheet pile main body 1 similar to the conventional one and a stiffening material that stiffens the steel sheet pile main body 1, and a pair of flanges 22, 23 is made of H-section steel 24 having different left and right widths. As described above, the steel sheet pile main body 1 includes the web 2, the flange 3, the arm 4, and the joint 5, and is connected to the adjacent steel sheet pile main body 1 via the joint 5. The H-shaped steel 24 includes a flange 22 having a relatively narrow left and right width (flange width) at both ends of the web 25 and a flange 23 having a wider left and right width than the flange 22.

幅の狭いフランジ22は、鋼矢板本体1のウェブ2の左右幅より少し幅の狭い幅を有し、ウェブ2に接触させられる矢板接触部となっている。この例では、幅の狭いフランジ22が鋼矢板本体1の谷側(凹側)となる面でウェブ2に接触している。
なお、幅の狭いフランジ22を鋼矢板本体1の山側(凹側)の面でウェブ2に接触させる場合には、幅の狭いフランジ22の左右幅の方が鋼矢板本体1のウェブ2の左右幅より広くなってもよい。
The narrow flange 22 has a width that is slightly narrower than the left and right widths of the web 2 of the steel sheet pile main body 1, and serves as a sheet pile contact portion that is brought into contact with the web 2. In this example, the narrow flange 22 is in contact with the web 2 on the surface that becomes the valley side (concave side) of the steel sheet pile main body 1.
When the narrow flange 22 is brought into contact with the web 2 on the surface (concave side) of the steel sheet pile main body 1, the left and right width of the narrow flange 22 is the right and left of the web 2 of the steel sheet pile main body 1. It may be wider than the width.

また、鋼矢板壁26を構築した際に、鋼矢板本体1に対して、土留め壁として土砂を支えて土圧(図中において矢印で示す。)がかかる側にH形鋼24が配置される。幅の広いフランジ23は、幅の狭いフランジ22を鋼矢板本体1に接触した状態で、鋼矢板本体1と離れた側に配置されることになる。すなわち、幅の広いフランジ23は、補剛材としてのH形鋼24において主に土圧を受ける土圧受け部となっている。また、H形鋼24のウェブ25は、矢板接触部としてのフランジ22と土圧受け部としてのフランジ23とを接続する接続部として機能する。   Further, when the steel sheet pile wall 26 is constructed, the H-section steel 24 is arranged on the side on which the earth pressure (indicated by arrows in the figure) is applied to the steel sheet pile main body 1 while supporting the earth and sand as a retaining wall. The The wide flange 23 is disposed on the side away from the steel sheet pile main body 1 with the narrow flange 22 in contact with the steel sheet pile main body 1. That is, the wide flange 23 is an earth pressure receiving portion that mainly receives earth pressure in the H-section steel 24 as a stiffener. Moreover, the web 25 of the H-section steel 24 functions as a connection part that connects the flange 22 as the sheet pile contact part and the flange 23 as the earth pressure receiving part.

組合せ鋼矢板壁26は、通常の鋼矢板壁と同様に、鋼矢板本体1どうしが継手5を介して接続するように鋼矢板本体1を地盤に埋設(打設、圧入等)するとともに、各鋼矢板本体1毎にH形鋼24を埋設することにより構築される。そして、複数の鋼矢板本体1が接続されているとともに、鋼矢板壁26の同じ面側において、各鋼矢板本体1のウェブ2にH形鋼24の幅の狭いフランジ22の外面が接触した状態となっている。   Like the normal steel sheet pile wall, the combined steel sheet pile wall 26 embeds the steel sheet pile main body 1 in the ground so that the steel sheet pile main bodies 1 are connected to each other via the joint 5 (for example, placing and press-fitting). It is constructed by embedding an H-section steel 24 for each steel sheet pile main body 1. And while the some steel sheet pile main body 1 is connected, in the same surface side of the steel sheet pile wall 26, the outer surface of the flange 22 with a narrow width | variety of the H-section steel 24 contacts the web 2 of each steel sheet pile main body 1 It has become.

組合せ鋼矢板壁26の施工においては、鋼矢板本体1とH形鋼24とを別々に埋設するものとしてもよいし、鋼矢板本体1とH形鋼24とを一体にして埋設してもよい。また、一本の鋼矢板本体1を埋設した後に一本のH形鋼24を埋設していくことを繰り返すものとしてもよいし、複数の鋼矢板本体1を埋設した後に複数のH形鋼24を順次埋設していくものとしてよい。鋼矢板本体1とH形鋼24とは、基本的に接合しないが、一方の端部同士を接合したり係合できるようにしてもよく、特に鋼矢板本体1とH形鋼24とを一体に地盤に打設や圧入する場合に、鋼矢板本体1とH形鋼24との下端側を互いに接合してもよい。   In the construction of the combined steel sheet pile wall 26, the steel sheet pile main body 1 and the H-section steel 24 may be embedded separately, or the steel sheet pile main body 1 and the H-section steel 24 may be embedded integrally. . Moreover, after embedding one steel sheet pile main body 1, it is good also as what repeats embedding one H-section steel 24, and after embedding several steel sheet pile main bodies 1, several H-section steel 24 is embedded. May be buried sequentially. The steel sheet pile main body 1 and the H-section steel 24 are not basically joined, but one end may be joined or engaged. In particular, the steel sheet pile main body 1 and the H-section steel 24 are integrated. When placing or press-fitting into the ground, the lower end sides of the steel sheet pile main body 1 and the H-section steel 24 may be joined to each other.

この組合せ鋼矢板壁26においては、鋼矢板本体1が土圧のかからない側(相対的に土圧が低い側)に配置され、H形鋼24が土圧のかかる側(相対的に土圧が高い側)に配置される。例えば、組合せ鋼矢板壁26をその上端付近まで埋設して構築した後に、組合せ鋼矢板壁26で仕切られる地盤の二つの区域の一方の区域側を掘削した場合は、掘削された区域側が土圧のかからない側であり、掘削されていない区域側が土圧のかかる側である。また、組合せ鋼矢板壁26の上部が地盤上に露出するように組合せ鋼矢板壁を構築した後に、仕切られた二つの区域のうちの一方の区域側に土砂を充填する場合は、土砂が充填される一方の区域側が土圧のかかる側であり、他方の区域側が土圧のかからない側である。   In this combined steel sheet pile wall 26, the steel sheet pile main body 1 is arranged on the side where the earth pressure is not applied (the side where the earth pressure is relatively low), and the H-section steel 24 is the side where the earth pressure is applied (the earth pressure is relatively low). Placed on the high side. For example, when the combined steel sheet pile wall 26 is buried and constructed near the upper end and then excavated in one of the two areas of the ground divided by the combined steel sheet pile wall 26, the excavated area side is the earth pressure. The side that is not covered and the area that is not excavated is the side that is subject to earth pressure. In addition, after constructing the combined steel sheet pile wall so that the upper part of the combined steel sheet pile wall 26 is exposed on the ground, when the earth and sand are filled in one of the two divided areas, the earth and sand are filled. One area side to be subjected to earth pressure is a side to which earth pressure is applied, and the other area side is a side to which earth pressure is not applied.

この状態で、H形鋼24には、幅の広いフランジ23から主に土圧が作用し、鋼矢板本体1では、隣り合うH形鋼24の同士の間から鋼矢板本体1に土圧が作用することになる。H形鋼24では、フランジ23の左右幅を広くすることで、受ける土圧が大きくなり、鋼矢板本体1では、左右幅の広いフランジ23に遮られることにより受ける土圧が弱くなる。   In this state, earth pressure mainly acts on the H-shaped steel 24 from the wide flange 23, and in the steel sheet pile main body 1, earth pressure is applied to the steel sheet pile main body 1 from between adjacent H-shaped steels 24. Will work. In the H-section steel 24, the earth pressure received by increasing the left and right width of the flange 23 is increased, and in the steel sheet pile main body 1, the earth pressure received by being blocked by the flange 23 having a large left and right width is reduced.

ここで、フランジ23の幅が十分に広くH形鋼24にかかる土圧が十分に高くなると、土圧により鋼矢板本体1にH形鋼24が押し付けられて、鋼矢板本体1とH形鋼24とが接触した状態が維持されるとともに、鋼矢板本体1とH形鋼24とのたわみ挙動が一致することになる。なお、フランジ23の幅が不十分だと、H形鋼24にかかる土圧による変形よりも、鋼矢板本体1の土圧による変形が大きくなってしまい、鋼矢板本体1とH形鋼24が土圧により離れてしまい、鋼矢板本体1とH形鋼24のたわみ挙動が一致せず重ね梁として機能しない。   Here, when the earth pressure applied to the H-section steel 24 becomes sufficiently high when the width of the flange 23 is sufficiently wide, the H-section steel 24 is pressed against the steel sheet pile body 1 by the earth pressure, and the steel sheet pile body 1 and the H-section steel 24 is maintained in contact with each other, and the bending behavior of the steel sheet pile main body 1 and the H-section steel 24 is matched. In addition, if the width of the flange 23 is insufficient, the deformation due to the earth pressure of the steel sheet pile main body 1 becomes larger than the deformation due to the earth pressure applied to the H-section steel 24, and the steel sheet pile main body 1 and the H-section steel 24 are The steel sheet pile main body 1 and the H-shaped steel 24 do not coincide with each other and do not function as a laminated beam.

したがって、フランジ23の幅は、H形鋼24の土圧による変形より鋼矢板本体1の土圧による変形が大きくならないように設定される。すなわち、H形鋼24から鋼矢板本体1が土圧により離れないようにフランジ23の幅が設定される。このようなフランジ23の幅は、鋼矢板本体1およびH形鋼24の形状、サイズ、板厚、材質等に基づく強度や、地盤を構成する土砂の条件等に基づいて計算もしくは実験的に求められることになる。なお、隣り合うフランジ23の幅が鋼矢板本体1の有効幅を超えると、互いのフランジ23が接触する状態となり、鋼矢板本体1の後側を完全に覆った状態となる。この場合は、鋼矢板本体1側に直接的に土圧がかかる状態とならず、鋼矢板本体1がH形鋼24から離れることはない。しかし、必要以上の鋼材が使用されることになるので、幅の広いフランジ23の幅は、鋼矢板本体1の有効幅以下とすることが好ましい。   Therefore, the width of the flange 23 is set so that the deformation due to the earth pressure of the steel sheet pile main body 1 does not become larger than the deformation due to the earth pressure of the H-section steel 24. That is, the width of the flange 23 is set so that the steel sheet pile main body 1 is not separated from the H-shaped steel 24 by earth pressure. The width of the flange 23 is calculated or experimentally determined based on the strength based on the shape, size, thickness, material, etc. of the steel sheet pile main body 1 and the H-shaped steel 24, the conditions of the earth and sand constituting the ground, and the like. Will be. In addition, when the width | variety of the adjacent flange 23 exceeds the effective width of the steel sheet pile main body 1, it will be in the state which mutual flange 23 contacts and will be in the state which covered the rear side of the steel sheet pile main body 1 completely. In this case, no earth pressure is directly applied to the steel sheet pile main body 1 side, and the steel sheet pile main body 1 is not separated from the H-section steel 24. However, since the steel material more than necessary is used, it is preferable that the width of the wide flange 23 is equal to or less than the effective width of the steel sheet pile main body 1.

このH形鋼24のフランジ23の幅が十分広い場合には、鋼矢板本体1にH形鋼24を溶接等により固定してない状態で、H形鋼24を鋼矢板本体1に対して土圧のかかる側、または相対的に土圧が高くなる側に配置しても、H形鋼24から鋼矢板本体1が離れることがなく、H形鋼24と鋼矢板本体1とのたわみ挙動が一致する。これにより、組合せ鋼矢板壁26は、鋼矢板本体1とH形鋼24とが重ね梁として機能して土圧を支持するので、鋼矢板本体1からなる鋼矢板壁よりも土圧による変形量を小さくすることができる。   When the width of the flange 23 of the H-shaped steel 24 is sufficiently wide, the H-shaped steel 24 is not soiled with respect to the steel sheet pile main body 1 in a state where the H-shaped steel 24 is not fixed to the steel sheet pile main body 1 by welding or the like. Even if it is arranged on the side where the pressure is applied or on the side where the earth pressure is relatively high, the steel sheet pile main body 1 does not leave the H-section steel 24, and the deflection behavior between the H-section steel 24 and the steel sheet pile main body 1 is Match. Thereby, since the steel sheet pile main body 1 and the H-shaped steel 24 function as a laminated beam and support earth pressure, the combination steel sheet pile wall 26 is more deformed by earth pressure than the steel sheet pile wall made of the steel sheet pile main body 1. Can be reduced.

組合せ鋼矢板26の曲げモーメントに対する物体の変形のしにくさを表した量である断面二次モーメントaは、鋼矢板本体1とH形鋼24とが重ね梁として機能する場合、鋼矢板本体1の断面二次モーメントbと、H形鋼24の断面二次モーメントcとの足し合わせにより求めることができる。すなわち、a=b+cとなる。
なお、第1実施形態では、鋼矢板本体1の谷側となる面にH形鋼24を配置したが、山側となる側面にH形鋼24を配置してもよい(図2参照)。但し、鋼矢板本体1の谷側となる面にH形鋼24を配置した場合よりも、山側となる面にH形鋼24を配置した方が、鋼矢板本体1の接続方向(前記左右となる方向)、すなわち、組合せ鋼矢板壁26の延在する長さ方向と直交する方向に沿った長さ(厚さ)が長くなる。したがって、打設スペースは鋼矢板本体1の谷側となる面にH形鋼24を配置する方が小さくて済む。
When the steel sheet pile main body 1 and the H-section steel 24 function as a laminated beam, the cross-sectional secondary moment a, which is an amount representing the difficulty of deformation of the object with respect to the bending moment of the combined steel sheet pile 26, is the steel sheet pile main body 1. Of the cross sectional secondary moment b and the cross sectional secondary moment c of the H-section steel 24 can be obtained. That is, a = b + c.
In addition, in 1st Embodiment, although the H-section steel 24 was arrange | positioned in the surface used as the trough side of the steel sheet pile main body 1, you may arrange | position the H-section steel 24 in the side used as the peak side (refer FIG. 2). However, the direction in which the H-section steel 24 is disposed on the surface that is the ridge side is greater than the connection direction of the steel sheet pile body 1 (the left and right sides) Direction), that is, the length (thickness) along the direction orthogonal to the extending length direction of the combined steel sheet pile wall 26 becomes longer. Therefore, the placement space is smaller when the H-section steel 24 is disposed on the surface of the steel sheet pile main body 1 on the valley side.

次に、本発明の第2実施形態を図2に基づいて説明する。
図2に示すように、この例の組合せ鋼矢板壁36は、第1実施形態と同様のハット形の鋼矢板本体1と、一対のフランジ32の幅が互いに等しい一般的な形状のH形鋼33と、土圧受け部材となる鋼板34とから構成されている。なお、鋼板34は、形鋼としての平鋼であってもよい。第2実施形態においては、矢板接触部材であるH形鋼33の一方のフランジ32が鋼矢板本体1のウェブ2に接触させられ、他方のフランジ32にフランジ32より幅の広い鋼板34が土圧受け部材として取り付けられる。この構造ではH形鋼33の鋼矢板本体1に接触している一方のフランジ32が矢板接触部、鋼板34が土圧受け部、H形鋼のウェブ35および鋼板34が取り付けられる他方のフランジ32が接続部として機能する。
Next, a second embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 2, the combined steel sheet pile wall 36 of this example includes a hat-shaped steel sheet pile main body 1 similar to the first embodiment, and a H-shaped steel having a general shape in which the widths of a pair of flanges 32 are equal to each other. 33 and a steel plate 34 serving as a soil pressure receiving member. The steel plate 34 may be a flat steel as a shape steel. In the second embodiment, one flange 32 of the H-section steel 33 that is a sheet pile contact member is brought into contact with the web 2 of the steel sheet pile main body 1, and a steel plate 34 wider than the flange 32 is grounded to the other flange 32. It is attached as a receiving member. In this structure, one flange 32 in contact with the steel sheet pile main body 1 of the H-shaped steel 33 is a sheet pile contact portion, a steel plate 34 is an earth pressure receiving portion, the other flange 32 to which the H-shaped steel web 35 and the steel plate 34 are attached. Functions as a connection.

すなわち、第1実施形態では、H形鋼33の一対のフランジ22,23の幅を互いに異なるものとすることにより、幅の狭いフランジ22を矢板接触部とし、幅の広いフランジ23を土圧受け部としていたが、第2実施形態では、フランジ32より幅の広い鋼板34を他方のフランジ32に取り付けることで、鋼板34を土圧受け部(土圧受け部材)としている。
鋼板34は、鋼矢板本体1およびH形鋼33と同様に長尺な構造を有するもので、H形鋼33とほぼ同じ長さを有するものとなっている。
また、鋼板34の長さ方向と直交する左右幅は、第1実施形態の幅の広いフランジ23の左右幅と同様に決定される。
That is, in the first embodiment, by making the widths of the pair of flanges 22 and 23 of the H-section steel 33 different from each other, the narrow flange 22 is used as a sheet pile contact portion, and the wide flange 23 is received by earth pressure. However, in the second embodiment, the steel plate 34 is used as the earth pressure receiving portion (earth pressure receiving member) by attaching the steel plate 34 wider than the flange 32 to the other flange 32.
The steel plate 34 has a long structure similar to the steel sheet pile main body 1 and the H-section steel 33, and has substantially the same length as the H-section steel 33.
Moreover, the left-right width orthogonal to the length direction of the steel plate 34 is determined similarly to the left-right width of the wide flange 23 of the first embodiment.

H形鋼33のフランジ32の左右幅は、第1実施形態のH形鋼24の幅の狭いフランジ22と同様に鋼矢板本体1のウェブ2の左右幅より少し短いものとなっている。   The left-right width of the flange 32 of the H-section steel 33 is slightly shorter than the left-right width of the web 2 of the steel sheet pile main body 1 in the same manner as the narrow flange 22 of the H-section steel 24 of the first embodiment.

組合せ鋼矢板壁36を施工する際には、鋼矢板本体1、H形鋼33、鋼板34を一体として施工してもよいし、それぞれ別々に施工してもよいし、鋼矢板本体1を施工し、これらとは別にH形鋼33と鋼板34とを一体に施工してもよいし、鋼矢板本体1とH形鋼33とを一体に施工し、これらとは別に鋼板34を施工してもよい。これらの施工に対して各部材の施工順は任意に決められる。   When constructing the combined steel sheet pile wall 36, the steel sheet pile main body 1, the H-shaped steel 33, and the steel sheet 34 may be constructed integrally, or may be separately constructed, or the steel sheet pile main body 1 is constructed. Alternatively, the H-section steel 33 and the steel plate 34 may be constructed integrally, or the steel sheet pile main body 1 and the H-section steel 33 are constructed integrally, and the steel plate 34 is constructed separately from these. Also good. For these constructions, the construction order of each member is arbitrarily determined.

第2実施形態の組合せ鋼矢板壁36は、第1実施形態の組合せ鋼矢板壁26と同様の作用効果を奏する。また、第1実施形態では、補剛材として、H形鋼24以外の部材を必要とせず、施工性に優れるが、一般的なH形鋼と異なる形状のH形鋼24を必要とする。それに対して、第2実施形態では、補剛材としてH形鋼33のほかに鋼板34が必要となるが、H形鋼33として一般的な形状のものを用いることができる。   The combined steel sheet pile wall 36 of the second embodiment has the same effects as the combined steel sheet pile wall 26 of the first embodiment. Moreover, in 1st Embodiment, members other than H-section steel 24 are not required as a stiffening material, and it is excellent in workability, but the H-section steel 24 of a shape different from general H-section steel is required. On the other hand, in the second embodiment, a steel plate 34 is required in addition to the H-section steel 33 as the stiffening material, but a general shape can be used as the H-section steel 33.

なお、図2では、鋼矢板本体1の山側となる面にH形鋼33を配置しているが、鋼矢板本体1の谷側となる面にH形鋼33を配置する方が打設スペースは小さくて済む。
また、H形鋼33の他方のフランジ32と、鋼板34との接合方法は、例えば、コーピング、溶接、ボルト、ドリルねじのいずれか、またはこれらのうちのいくつかの組合せで行うことができる。また、H形鋼33と鋼板34とは、ほぼ全長に渡って接合する必要はなく、例えば、上端部もしくは下端部だけを接合するものであってもよい。また、H形鋼33と鋼板34とを接合しないものとしてもよい。なお、コーピングは、鋼矢板式岸壁で、鋼矢板頭部を巻き込んで打設するコンクリートであり、このコンクリートにより鋼矢板本体1、H形鋼33、鋼板34が接合された状態となる。
また、このような第2実施形態の組合せ鋼矢板壁36における断面二次モーメントは、鋼矢板本体1、H形鋼33および鋼板34それぞれの断面二次モーメントを足し合わせることにより求めることができる。
In addition, in FIG. 2, although the H-section steel 33 is arrange | positioned in the surface used as the mountain side of the steel sheet pile main body 1, the direction which arrange | positions the H-section steel 33 in the surface used as the trough side of the steel sheet pile main body 1 is placement space. Is small.
Moreover, the joining method of the other flange 32 of the H-section steel 33 and the steel plate 34 can be performed by, for example, any of coping, welding, bolts, drill screws, or some combination thereof. Moreover, it is not necessary to join the H-section steel 33 and the steel plate 34 over substantially the whole length, for example, only an upper end part or a lower end part may be joined. Further, the H-shaped steel 33 and the steel plate 34 may not be joined. The coping is a steel sheet pile quay and is a concrete in which a steel sheet pile head is wound and placed, and the steel sheet pile main body 1, the H-shaped steel 33 and the steel plate 34 are joined by this concrete.
Moreover, the cross-sectional secondary moment in the combination steel sheet pile wall 36 of such 2nd Embodiment can be calculated | required by adding the cross-sectional secondary moment of each of the steel sheet pile main body 1, the H-section steel 33, and the steel plate 34. FIG.

次に、本発明の第3実施形態を図3に基づいて説明する。
図3に示すように、この例の組合せ鋼矢板壁47は、第2実施形態と同様の鋼矢板本体1と、第2実施形態と同様の矢板接触部材としてのH形鋼33と、土圧受け部材として第2実施形態の鋼板に代えて補剛用鋼矢板42とからなるものである。この例で補剛用鋼矢板42は、ウェブ43と、その左右側縁にそれぞれウェブ43に対して斜めで互いに広がるように設けられたフランジ44と、フランジ44の先端部に設けられた継手45とからなるU形の鋼矢板である。なお、補剛用鋼矢板42は、接続して用いる必要はないので、継手45がなくてもよい。
Next, a third embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 3, the combined steel sheet pile wall 47 of this example includes a steel sheet pile main body 1 similar to the second embodiment, an H-section steel 33 as a sheet pile contact member similar to the second embodiment, and earth pressure. The receiving member is composed of a stiffening steel sheet pile 42 instead of the steel plate of the second embodiment. In this example, the stiffening steel sheet pile 42 includes a web 43, a flange 44 provided at each of the left and right side edges thereof so as to spread obliquely with respect to the web 43, and a joint 45 provided at a distal end portion of the flange 44. Is a U-shaped steel sheet pile. Note that the stiffening steel sheet pile 42 does not need to be connected and used, and therefore the joint 45 may not be provided.

この例では、矢板接触部材であるH形鋼33の鋼矢板本体1に接触する一方のフランジ32が矢板接触部であり、H形鋼33の他方のフランジ32に接触する補剛用鋼矢板42が土圧受け部であり、H形鋼33のウェブ35および補剛用鋼矢板42に接触する他方のフランジ32が接続部である。矢板接触部としてのH形鋼33の一方のフランジ32の左右幅より、土圧受け部材としての補剛用鋼矢板42の左右幅の方が広くなっている。また、鋼矢板本体1のウェブ2および補剛用鋼矢板42のウェブ43の左右幅より、H形鋼33のフランジ32の左右幅の方が少し狭くなっている。また、H形鋼33の一対のフランジ32のうちの一方のフランジ32は、鋼矢板本体1の谷側に接触し、他方のフランジ32は、補剛用鋼矢板42の谷側に接触している。   In this example, one flange 32 that contacts the steel sheet pile main body 1 of the H-section steel 33 that is a sheet pile contact member is a sheet pile contact portion, and the stiffening steel sheet pile 42 that contacts the other flange 32 of the H-section steel 33. Is the earth pressure receiving portion, and the other flange 32 in contact with the web 35 of the H-shaped steel 33 and the stiffening steel sheet pile 42 is the connecting portion. The left and right width of the stiffening steel sheet pile 42 as the earth pressure receiving member is wider than the left and right width of one flange 32 of the H-shaped steel 33 as the sheet pile contact portion. Moreover, the left-right width of the flange 32 of the H-shaped steel 33 is slightly narrower than the left-right width of the web 2 of the steel sheet pile main body 1 and the web 43 of the steel sheet pile 42 for stiffening. Moreover, one flange 32 of the pair of flanges 32 of the H-shaped steel 33 is in contact with the valley side of the steel sheet pile main body 1, and the other flange 32 is in contact with the valley side of the stiffening steel sheet pile 42. Yes.

第3実施形態の組合せ鋼矢板壁47は、第2実施形態の組合せ鋼矢板壁36における鋼板34を補剛用鋼矢板42に代えたものであり、第2実施形態と同様の方法で、組合せ鋼矢板壁47を構築することができ、また、第2実施形態の組合せ鋼矢板壁36と同様の作用効果を得ることができる。また、補剛用鋼矢板42の左右幅は、第1実施形態のH形鋼24の幅の広い方のフランジ23の左右幅と同様に決定することができる。
なお、補剛用鋼矢板42としては、U形鋼矢板以外に、ハット形鋼矢板、直線形鋼矢板等を用いることが可能である。
The combination steel sheet pile wall 47 of the third embodiment is obtained by replacing the steel sheet 34 in the combination steel sheet pile wall 36 of the second embodiment with a steel sheet pile 42 for stiffening, and is combined in the same manner as in the second embodiment. The steel sheet pile wall 47 can be constructed, and the same effects as the combined steel sheet pile wall 36 of the second embodiment can be obtained. Moreover, the left-right width of the stiffening steel sheet pile 42 can be determined similarly to the left-right width of the wider flange 23 of the H-section steel 24 of the first embodiment.
In addition to the U-shaped steel sheet pile, a hat-shaped steel sheet pile, a linear steel sheet pile, or the like can be used as the stiffening steel sheet pile 42.

図4から図6は、第3実施形態の組合せ鋼矢板壁47の変形例を示すものである。
図4に示す変形例としての組合せ鋼矢板壁52は、第3実施形態のU形の補剛用鋼矢板42に代えて、ハット形の補剛用鋼矢板53を用い、かつ、補剛用鋼矢板53のうちの一方の継手を無くしたものである。それ以外の構成については、第3実施形態と同様の構成を有するものとなっている。
4 to 6 show modified examples of the combined steel sheet pile wall 47 of the third embodiment.
A modified steel sheet pile wall 52 as a modification shown in FIG. 4 uses a hat-shaped stiffening steel sheet pile 53 instead of the U-shaped stiffening steel sheet pile 42 of the third embodiment, and is used for stiffening. One of the steel sheet piles 53 is eliminated. About the structure of other than that, it has the structure similar to 3rd Embodiment.

なお、補剛用鋼矢板53は、ハット形の鋼矢板本体1と略同様に、ウェブ54、フランジ55およびアーム56とを備え、一方のアーム56に継手57を備え、他方のアーム56には継手57が設けられていないものとなっている。接合に使われない継手57を一つ設けないことで、コストの低減を図ることができる。また、継手57を両方とも設けないものとしてもよい。   The stiffening steel sheet pile 53 includes a web 54, a flange 55, and an arm 56, substantially the same as the hat-shaped steel sheet pile main body 1, one arm 56 includes a joint 57, and the other arm 56 includes The joint 57 is not provided. The cost can be reduced by not providing one joint 57 that is not used for joining. Further, both of the joints 57 may not be provided.

図5に示す変形例としての組合せ鋼矢板壁62は、図3に示す第3実施形態において、補剛用鋼矢板42の谷側にH形鋼33のフランジ32を接触していたのに対して、補剛用鋼矢板42の山側にH形鋼33のフランジ32を接触したものであり、それ以外の構成は第3実施形態と同様の構成を有するものとなっている。なお、スペース効率的には、図3に示す第3実施形態の組合せ鋼矢板壁47のように、補剛用鋼矢板42の谷側にH形鋼33のフランジ32を接触することが好ましい。   The modified combination sheet pile wall 62 shown in FIG. 5 is in contact with the flange 32 of the H-section steel 33 on the valley side of the stiffening steel sheet pile 42 in the third embodiment shown in FIG. Then, the flange 32 of the H-shaped steel 33 is brought into contact with the mountain side of the stiffening steel sheet pile 42, and the other configuration has the same configuration as that of the third embodiment. In terms of space efficiency, it is preferable that the flange 32 of the H-section steel 33 is in contact with the valley side of the stiffening steel sheet pile 42 as in the combination steel sheet pile wall 47 of the third embodiment shown in FIG.

図6に示す変形例としての組合せ鋼矢板壁72は、第3実施形態のU形の補剛用鋼矢板42に代えて、図4に示す補剛用鋼矢板53と同様に、一方の継手のないハット形の補剛用鋼矢板53を用い、かつ、補剛用鋼矢板42の山側にH形鋼33のフランジ32を接触したものであり、それ以外の構成は第3実施形態と同様の構成を有するものとなっている。なお、上述のようにスペース効率的には、補剛用鋼矢板53の谷側にH形鋼33を接触させることが好ましい。   A combination steel sheet pile wall 72 as a modified example shown in FIG. 6 is replaced with one joint similarly to the stiffening steel sheet pile 53 shown in FIG. 4 instead of the U-shaped stiffening steel sheet pile 42 of the third embodiment. A hat-shaped stiffening steel sheet pile 53 without a flange is used, and the flange 32 of the H-shaped steel 33 is brought into contact with the mountain side of the stiffening steel sheet pile 42, and the other configuration is the same as that of the third embodiment. It has the structure of. As described above, it is preferable that the H-section steel 33 is brought into contact with the valley side of the stiffening steel sheet pile 53 in terms of space efficiency.

次に、本発明の第4実施形態を図7に基づいて説明する。
図7に示すように、この例の組合せ鋼矢板壁86は、第1実施形態と同様の鋼矢板本体1と、第2実施形態と同様のH形鋼33と、土圧受け部材として第2実施形態の鋼板34に代えて補剛用H形鋼82とからなるものである。
Next, a fourth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 7, the combined steel sheet pile wall 86 of this example includes a steel sheet pile main body 1 similar to the first embodiment, an H-section steel 33 similar to the second embodiment, and a second earth pressure receiving member. Instead of the steel plate 34 of the embodiment, it comprises a stiffening H-section steel 82.

第4実施形態の組合せ鋼矢板壁86は、第2実施形態と同様の方法で、組合せ鋼矢板壁86を構築することができ、また、第2実施形態の組合せ鋼矢板壁36と同様の作用効果を得ることができる。また、H形鋼82のウェブ83の幅は、第1実施形態のH形鋼24の幅の広い方のフランジ23の左右幅と同様に決定することができる。   The combination steel sheet pile wall 86 of the fourth embodiment can construct the combination steel sheet pile wall 86 by the same method as the second embodiment, and also has the same action as the combination steel sheet pile wall 36 of the second embodiment. An effect can be obtained. The width of the web 83 of the H-section steel 82 can be determined in the same manner as the left and right widths of the wider flange 23 of the H-section steel 24 of the first embodiment.

図8は、図7の組合せ鋼矢板壁86の変形例を示すものである。
図7に示す組合せ鋼矢板壁86は、補剛用H形鋼82のウェブ83を、H形鋼33の他方のフランジ32に接触させて、補剛用H形鋼82のウェブ83を土圧受け部材としたが、図8の組合せ鋼矢板壁96は、補剛用H形鋼92の一方のフランジ94を、H形鋼33の他方のフランジ32に接触させて、補剛用H形鋼92の一方のフランジ94と他方のフランジ94を土圧受け部材としたものである。この補剛用H形鋼92は、ウェブ93とその両端部にそれぞれ設けられたフランジ94とからなるものである。
FIG. 8 shows a modification of the combined steel sheet pile wall 86 of FIG.
The combined steel sheet pile wall 86 shown in FIG. 7 brings the web 83 of the H-shaped steel 82 for stiffening into contact with the other flange 32 of the H-shaped steel 33, thereby causing the web 83 of the H-shaped steel 82 for stiffening to earth pressure. 8, the combined steel sheet pile wall 96 in FIG. 8 has one flange 94 of the stiffening H-shaped steel 92 brought into contact with the other flange 32 of the H-shaped steel 33, so that the stiffening H-shaped steel. 92, one flange 94 and the other flange 94 are earth pressure receiving members. The stiffening H-section steel 92 is composed of a web 93 and flanges 94 provided at both ends thereof.

矢板接触部材となるH形鋼33のフランジ32より、土圧受け部材となる補剛用H形鋼92のフランジ94の方が幅が広くなっている。この変形例においても、上述の第4実施形態と同様の作用効果を得ることができる。また、補剛用H形鋼92のフランジ94の幅は、第1実施形態のH形鋼24の幅の広い方のフランジ23の左右幅と同様に決定することができる。   The flange 94 of the stiffening H-section steel 92 serving as the earth pressure receiving member is wider than the flange 32 of the H-section steel 33 serving as the sheet pile contact member. Also in this modification, the same effect as the above-described fourth embodiment can be obtained. Further, the width of the flange 94 of the H-shaped steel 92 for stiffening can be determined in the same manner as the left and right width of the wider flange 23 of the H-shaped steel 24 of the first embodiment.

また、鋼矢板本体としては、以下に説明するように、U型鋼矢板やZ型鋼矢板を用いることもできる。
本発明の第5実施形態を図9に基づいて説明する。
図9に示すように、この例の組合せ鋼矢板壁64は、U形の鋼矢板本体65と、第2の実施形態と同様の、一対のフランジ32の幅が互いに等しい一般的な形状のH形鋼33と、土圧受け部材となる鋼板34とから構成されている。またこの例では、鋼矢板本体が1枚おきに補剛されている。
Moreover, as a steel sheet pile main body, a U-shaped steel sheet pile or a Z-type steel sheet pile can also be used so that it may demonstrate below.
A fifth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 9, the combined steel sheet pile wall 64 of this example includes a U-shaped steel sheet pile main body 65 and a general shape H having the same width of a pair of flanges 32 as in the second embodiment. It is comprised from the shape steel 33 and the steel plate 34 used as an earth pressure receiving member. In this example, every other sheet pile main body is stiffened.

本発明の第6実施形態を図10に基づいて説明する。
図10に示すように、この例の組合せ鋼矢板壁67は、Z形の鋼矢板本体68と、第2の実施形態と同様の、一対のフランジ32の幅が互いに等しい一般的な形状のH形鋼33と、土圧受け部材となる鋼板34とから構成されている。H形鋼33の矢板接触部となるフランジ32は、隣接する鋼矢板本体68の継手69a、69bの接続部において鋼矢板本体68に接触される。
A sixth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 10, the combined steel sheet pile wall 67 of this example includes a Z-shaped steel sheet pile main body 68 and a general shape H having the same width of a pair of flanges 32 as in the second embodiment. It is comprised from the shape steel 33 and the steel plate 34 used as an earth pressure receiving member. The flange 32 serving as a sheet pile contact portion of the H-shaped steel 33 is brought into contact with the steel sheet pile main body 68 at a connection portion between the joints 69 a and 69 b of the adjacent steel sheet pile main bodies 68.

本発明の第7実施形態を図11に基づいて説明する。
図11に示すように、この例の組合せ鋼矢板壁71は、Z形の鋼矢板本体68と、第2の実施形態と同様の、一対のフランジ32の幅が互いに等しい一般的な形状のH形鋼33と、土圧受け部材となる鋼板34とから構成されている。H形鋼33の矢板接触部となるフランジ32は、隣接する鋼矢板本体68の継手69a、69bの接続部においてスペーサー70を介して鋼矢板本体に接触される。
A seventh embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 11, the combined steel sheet pile wall 71 of this example has a general shape H in which the widths of the pair of flanges 32 are equal to each other, similar to the Z-shaped steel sheet pile main body 68 and the second embodiment. It is comprised from the shape steel 33 and the steel plate 34 used as an earth pressure receiving member. The flange 32 serving as the sheet pile contact portion of the H-shaped steel 33 is brought into contact with the steel sheet pile main body via the spacer 70 at the connection portion of the joints 69 a and 69 b of the adjacent steel sheet pile main bodies 68.

以上のように、各種鋼矢板の土圧がかかる側(土圧が高くなる側)に補剛材を配置しても、補剛材に広い左右幅を備えた土圧受け部(土圧受け部材)を設けることで、補剛材が大きな土圧を受けて、鋼矢板と補剛材とのたわみ挙動がほぼ同様となり、組合せ鋼矢板の断面2次モーメントを高めることができる。また、図示した実施形態の例では、図9を除き、全ての鋼矢板本体が補剛されているが、鋼矢板壁の断面性能が許容されるのであれば、例えば鋼矢板本体を1枚おきに補剛する等、鋼矢板壁を構成する鋼矢板本体の全てが補剛されていなくてもよい。   As described above, even if a stiffener is placed on the side of the steel sheet pile where the earth pressure is applied (the side where the earth pressure increases), the earth pressure receiving part (earth pressure receiver) with a wide left and right width is provided on the stiffener. By providing the member, the stiffener is subjected to a large earth pressure, so that the bending behavior of the steel sheet pile and the stiffener becomes substantially the same, and the cross-sectional secondary moment of the combined steel sheet pile can be increased. Moreover, in the example of embodiment shown in figure, all the steel sheet pile main bodies are stiffened except FIG. 9, However, If the cross-sectional performance of a steel sheet pile wall is accept | permitted, every other steel sheet pile main body will be used, for example. All of the steel sheet pile main bodies constituting the steel sheet pile wall may not be stiffened.

さらに、土圧受け部(土圧受け部材)の好ましい左右幅(の下限値)ついて、算出方法を図12から図15に基づいて説明する。
土塊内の任意の面での応力状態を示す基本的な表示となるものとして、図12に示す「モールの応力円」がある。図12(a)で示すように土塊に上下左右より応力が作用した場合、任意の面ABでの主応力σとせん断応力τは、図12(b)のモールの応力円上のσ,τの値となる。図13に示す式(1)のラインは、モール・クーロンの破壊基準と呼ばれ、土塊に作用する応力が大きくなり、破壊基準のラインに接すると土塊は破壊に至る。なお、このときの図12における破壊面角度θはθ=45°+φ/2となる。
Further, a calculation method for a preferable left and right width (lower limit value) of the earth pressure receiving portion (earth pressure receiving member) will be described with reference to FIGS.
As a basic display showing the stress state on an arbitrary surface in the soil mass, there is a “Mole stress circle” shown in FIG. As shown in FIG. 12 (a), when stress is applied to the mass from above, below, left, and right, the principal stress σ and shear stress τ on an arbitrary plane AB are σ, τ on the stress circle of the mall in FIG. 12 (b). It becomes the value of. The line of the formula (1) shown in FIG. 13 is called Morle Coulomb's failure criterion, and the stress acting on the soil mass increases, and the soil mass breaks when it touches the failure criterion line. Note that the fracture surface angle θ in FIG. 12 at this time is θ = 45 ° + φ / 2.

Figure 0005177603
Figure 0005177603

一方、本発明の組合せ鋼矢板壁を考えた場合、図14の斜線に示す部分に対して、図15に示すように矢板壁に垂直な方向に長さdx分抜き出して力の釣り合いを考えると、下式(2)が成り立つ。   On the other hand, when considering the combined steel sheet pile wall of the present invention, considering the balance of force by extracting the length dx in the direction perpendicular to the sheet pile wall as shown in FIG. The following equation (2) holds.

Figure 0005177603
Figure 0005177603

ここで、式(2)のせん断力τ0において、式(1)で示すような最大のせん断力が作用すると考えると、下式(3)が成立し、式(2)と式(3)より、式(4)が成り立つ。Here, when it is considered that the maximum shearing force as shown in the equation (1) acts on the shearing force τ 0 in the equation (2), the following equation (3) is established, and the equations (2) and (3) Thus, Expression (4) is established.

Figure 0005177603
Figure 0005177603

Figure 0005177603
Figure 0005177603

x=0での主働土圧(すなわち、土圧受け部にかかる土圧)をP0とすると、x=Hでの土圧(すなわち、鋼矢板本体に直接作用する土圧)σhsは以下のようになる。If the main earth pressure at x = 0 (ie earth pressure applied to the earth pressure receiving part) is P 0 , the earth pressure at x = H (ie earth pressure acting directly on the steel sheet pile body) σ hs is become that way.

Figure 0005177603
Figure 0005177603

式(5),(6)より、鋼矢板本体に直接土圧が作用しない(すなわちσhs≦0となる)ような土圧受け部の左右幅Xは、式(7),(8)となる。From Equations (5) and (6), the left and right width X of the earth pressure receiving portion where the earth pressure does not act directly on the steel sheet pile main body (that is, σ hs ≦ 0) is expressed by Equations (7) and (8). Become.

Figure 0005177603
Figure 0005177603

以上より、土圧受け部の左右幅Xが式(7),(8)で示される範囲であれば、鋼矢板本体に直接土圧が作用せず、鋼矢板本体と補剛材のたわみ挙動が一致し、重ね梁式の組合せ鋼矢板とみなすことができると考えられる。   From the above, if the lateral width X of the earth pressure receiving portion is within the range indicated by the equations (7) and (8), earth pressure does not act directly on the steel sheet pile body, and the bending behavior of the steel sheet pile body and the stiffener It can be considered that it is regarded as a laminated beam type combined sheet pile.

さらに、土圧受け部の好ましい左右幅(の下限値)ついて、別の算出方法を下記の参考文献1の考え方を応用しつつ図16を用いて説明する。
[参考文献1:野本哲也,今泉繋良,阿部秀治,坪井正行,二見智子;基盤の局所沈下に伴う敷設高密度ポリエチレン(HDPE)ジオメンブレンの伸び挙動評価の模型実験,土木学会論文集No.652/lll-51,35-45,200.6]
Further, another preferred calculation method for the preferable left and right width (lower limit value) of the earth pressure receiving portion will be described with reference to FIG. 16 while applying the concept of Reference Document 1 below.
[Reference 1: Tetsuya Nomoto, Tatsuya Imaizumi, Hideharu Abe, Masayuki Tsuboi, Tomoko Futami; Model experiment for evaluating the elongation behavior of high density polyethylene (HDPE) geomembranes with local subsidence of the foundation, JSCE Proceedings No. 652 / lll-51,35-45,200.6]

参考文献1では、廃棄物処分場に敷設されるジオメンブレンに対して、その基盤の局所沈下を起こった際の引張ひずみの評価方法が提案されている。その本文中で、下式(9)の砂層のすべり面を仮定して、ジオメンブレンのひずみを算出している(参考文献1の図1およびp.42の式(15)参照)。   Reference Document 1 proposes a method for evaluating a tensile strain when a local subsidence of a base occurs in a geomembrane laid at a waste disposal site. In the text, the strain of the geomembrane is calculated on the assumption of the slip surface of the sand layer of the following formula (9) (see FIG. 1 of Reference 1 and formula (15) of p.42).

Figure 0005177603
Figure 0005177603

その考え方を水平方向に適用して、鋼矢板壁に作用する土圧と考える。図16に示すように、土圧受け部から式(9)の角度αに伸ばした線が、鋼矢板壁本体にぶつかる前に交差する条件であれば、鋼矢板本体に直接土圧が作用して補剛材と離れるように変形する条件ではないと考えられる。したがって、土圧受け部の左右幅が下式(10)を満たせば、鋼矢板本体に直接土圧が作用して補剛材と離れるように変形することはないと考えられる。   The idea is applied in the horizontal direction and considered as earth pressure acting on the steel sheet pile wall. As shown in FIG. 16, if the line extending from the earth pressure receiving portion to the angle α of the equation (9) intersects before hitting the steel sheet pile wall body, the earth pressure acts directly on the steel sheet pile body. Therefore, it is considered that it is not a condition to deform away from the stiffener. Therefore, if the left-right width of the earth pressure receiving portion satisfies the following expression (10), it is considered that the earth pressure directly acts on the steel sheet pile main body and does not deform away from the stiffener.

Figure 0005177603
Figure 0005177603

以上より、土圧受け部の左右幅Xが式(10)で示される範囲であっても、矢板に直接土圧が作用せず、鋼矢板本体と補剛材のたわみ挙動が一致し、重ね梁式の組合せ鋼矢板とみなすことができると考えられる。   From the above, even if the left and right width X of the earth pressure receiving portion is within the range represented by the formula (10), the earth pressure does not act directly on the sheet pile, and the bending behavior of the steel sheet pile body and the stiffener coincide with each other. It can be regarded as a beam-type combined steel sheet pile.

1 鋼矢板本体
22 フランジ(矢板接触部)
23 フランジ(土圧受け部)
24 H形鋼(補剛材、形鋼)
25 ウェブ(接続部)
26 組合せ鋼矢板壁
32 フランジ(矢板接触部、接続部)
33 H形鋼(形鋼、矢板接触部材)
34 鋼板(土圧受け部材)
35 ウェブ(接続部)
36 組合せ鋼矢板壁
42 補剛用鋼矢板(土圧受け部材)
47 組合せ鋼矢板壁
52 組合せ鋼矢板壁
53 補剛用鋼矢板(土圧受け部材)
62 組合せ鋼矢板壁
72 組合せ鋼矢板壁
82 補剛用H形鋼(土圧受け部材)
83 ウェブ(土圧受け部)
86 組合せ鋼矢板壁
92 補剛用H形鋼(土圧受け部材)
94 フランジ(土圧受け部)
96 組合せ鋼矢板壁
1 Steel sheet pile body 22 Flange (sheet pile contact part)
23 Flange (earth pressure receiving part)
24 H section steel (stiffener, section steel)
25 Web (connection part)
26 Combination steel sheet pile wall 32 Flange (sheet pile contact part, connection part)
33 H-section steel (section steel, sheet pile contact member)
34 Steel plate (earth pressure receiving member)
35 Web (connection part)
36 Combined steel sheet pile wall 42 Stiffening steel sheet pile (earth pressure receiving member)
47 Combined steel sheet pile wall 52 Combined steel sheet pile wall 53 Steel sheet pile for stiffening (earth pressure receiving member)
62 Combined steel sheet pile wall 72 Combined steel sheet pile wall 82 H-shaped steel for stiffening (earth pressure receiving member)
83 Web (earth pressure receiving part)
86 Combined steel sheet pile wall 92 H-shaped steel for stiffening (earth pressure receiving member)
94 Flange (earth pressure receiving part)
96 Combined steel sheet pile wall

Claims (5)

鋼矢板本体と、当該鋼矢板本体に実質的に接触して当該鋼矢板本体の軸方向に沿って配置される長尺な補剛材とを備え、前記鋼矢板本体を隣接する前記鋼矢板本体と継手を介して連続して配置することで構築する組合せ鋼矢板壁であって、
前記鋼矢板本体と前記補剛材とは略全長に渡る固定はされておらず、
前記補剛材は、前記連続配置した鋼矢板本体により仕切られた二つの区域のうちの相対的に土圧の高い区域側に配置され、
前記補剛材は、前記鋼矢板本体に実質的に接触する矢板接触部と、前記矢板接触部から離れた位置に設けられる土圧受け部と、これら矢板接触部および土圧受け部の間にあってこれら矢板接触部および土圧受け部を接続された状態とする接続部とを備え、
前記土圧受け部の左右幅Xは、次式(a)および(b)の条件を満たすことを特徴とする組合せ鋼矢板壁。
Figure 0005177603
The steel sheet pile main body, and the steel sheet pile main body adjacent to the steel sheet pile main body, comprising a steel sheet pile main body and a long stiffener disposed substantially along the axial direction of the steel sheet pile main body. And a combined steel sheet pile wall constructed by arranging them continuously through a joint,
The steel sheet pile main body and the stiffener are not fixed over substantially the entire length,
The stiffener is arranged on the relatively high earth pressure side of the two areas partitioned by the continuously arranged steel sheet pile main bodies,
The stiffener is between a sheet pile contact portion that substantially contacts the steel sheet pile main body, an earth pressure receiving portion provided at a position away from the sheet pile contact portion, and between the sheet pile contact portion and the earth pressure receiving portion. The sheet pile contact portion and the earth pressure receiving portion are provided with a connection portion that is connected,
The combined steel sheet pile wall characterized in that the lateral width X of the earth pressure receiving portion satisfies the conditions of the following expressions (a) and (b).
Figure 0005177603
鋼矢板本体と、当該鋼矢板本体に実質的に接触して当該鋼矢板本体の軸方向に沿って配置される長尺な補剛材とを備え、前記鋼矢板本体を隣接する前記鋼矢板本体と継手を介して連続して配置することで構築する組合せ鋼矢板壁であって、
前記鋼矢板本体と前記補剛材とは略全長に渡る固定はされておらず、
前記補剛材は、前記連続配置した鋼矢板本体により仕切られた二つの区域のうちの相対的に土圧の高い区域側に配置され、
前記補剛材は、前記鋼矢板本体に実質的に接触する矢板接触部と、前記矢板接触部から離れた位置に設けられる土圧受け部と、これら矢板接触部および土圧受け部の間にあってこれら矢板接触部および土圧受け部を接続された状態とする接続部とを備え、
前記土圧受け部の左右幅Xは、次式(c)の条件を満たすことを特徴とする組合せ鋼矢板壁。
Figure 0005177603
The steel sheet pile main body, and the steel sheet pile main body adjacent to the steel sheet pile main body, comprising a steel sheet pile main body and a long stiffener disposed substantially along the axial direction of the steel sheet pile main body. And a combined steel sheet pile wall constructed by arranging them continuously through a joint,
The steel sheet pile main body and the stiffener are not fixed over substantially the entire length,
The stiffener is arranged on the relatively high earth pressure side of the two areas partitioned by the continuously arranged steel sheet pile main bodies,
The stiffener is between a sheet pile contact portion that substantially contacts the steel sheet pile main body, an earth pressure receiving portion provided at a position away from the sheet pile contact portion, and between the sheet pile contact portion and the earth pressure receiving portion. The sheet pile contact portion and the earth pressure receiving portion are provided with a connection portion that is connected,
The combined steel sheet pile wall characterized in that the lateral width X of the earth pressure receiving portion satisfies the condition of the following formula (c).
Figure 0005177603
前記補剛材はH形鋼からなり、当該H形鋼の一方のフランジが前記矢板接触部とされ、他方のフランジが土圧受け部とされ、ウェブが接続部とされ、前記一方のフランジより前記他方のフランジの幅が広くされていることを特徴とする請求項1または請求項2に記載の組合せ鋼矢板壁。  The stiffener is made of H-shaped steel, one flange of the H-shaped steel is the sheet pile contact portion, the other flange is a soil pressure receiving portion, and the web is a connection portion. The combined steel sheet pile wall according to claim 1 or 2, wherein a width of the other flange is widened. 前記補剛材は、矢板接触部材と土圧受け部材とを備え、前記矢板接触部材は前記矢板接触部および接続部を備え、前記土圧受け部材は前記土圧受け部を備えている請求項1または請求項2に記載の組合せ鋼矢板壁。  The stiffener includes a sheet pile contact member and an earth pressure receiving member, the sheet pile contact member includes the sheet pile contact portion and a connection portion, and the earth pressure receiving member includes the earth pressure receiving portion. The combined steel sheet pile wall according to claim 1 or claim 2. 前記矢板接触部材がH形鋼であり、前記土圧受け部材が鋼板、形鋼または鋼矢板のいずれかであることを特徴とする請求項4に記載の組合せ鋼矢板壁。  The combined steel sheet pile wall according to claim 4, wherein the sheet pile contact member is H-shaped steel, and the earth pressure receiving member is any one of a steel plate, a shape steel, and a steel sheet pile.
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