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JP5381760B2 - Steel sheet pile retaining wall and design method thereof - Google Patents

Steel sheet pile retaining wall and design method thereof Download PDF

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JP5381760B2
JP5381760B2 JP2010021996A JP2010021996A JP5381760B2 JP 5381760 B2 JP5381760 B2 JP 5381760B2 JP 2010021996 A JP2010021996 A JP 2010021996A JP 2010021996 A JP2010021996 A JP 2010021996A JP 5381760 B2 JP5381760 B2 JP 5381760B2
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steel sheet
sheet pile
plate
retaining wall
earth pressure
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JP2011157781A (en
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裕章 中山
典佳 原田
辰昭 黒澤
亮祐 永津
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Description

本発明は、断面屈曲状に形成された鋼矢板で背面土圧を支持する鋼矢板擁壁、および鋼矢板擁壁の設計方法に関するものである。   The present invention relates to a steel sheet pile retaining wall that supports a back earth pressure with a steel sheet pile having a bent cross section, and a method for designing a steel sheet pile retaining wall.

土木建築分野における土留め壁として、鋼矢板を左右に連結して構築される鋼矢板擁壁が利用されている。このような鋼矢板擁壁の剛性を向上させるために、鋼矢板の側面にH形鋼を溶接固定したものが提案されている(例えば、特許文献1参照)。
また、鋼矢板擁壁として、背面側に複数の鋼矢板を連結した控え壁と、この控え壁の先端側に交差して複数の鋼矢板を連結した支圧壁とを設けることで、当該鋼矢板擁壁の剛性向上を図ったものも提案されている(例えば、特許文献2参照)。
As a retaining wall in the civil engineering and construction field, a steel sheet pile retaining wall constructed by connecting steel sheet piles to the left and right is used. In order to improve the rigidity of the steel sheet pile retaining wall, a steel sheet pile is welded and fixed to the side face of the steel sheet pile (for example, see Patent Document 1).
Further, as the steel sheet pile retaining wall, by providing a retaining wall in which a plurality of steel sheet piles are connected to the back side, and a bearing wall in which a plurality of steel sheet piles are connected to intersect the front end side of the retaining wall. The thing which aimed at the rigidity improvement of a sheet pile retaining wall is also proposed (for example, refer patent document 2).

ところで、土留め壁の前面側の敷地に建物や排水設備等を構築する場合、図6に示すように、土留め壁W近傍の地盤を掘削することがあり、このように前面地盤G1に掘削部Bを形成すると背面地盤G2との段差D2が大きくなって背面土圧P(=P1+P2)が増加することとなる。このため、土留め壁の設計に際しては、所定段差D1における背面土圧P1に対してのみならず、増加土圧P2も考慮して土留め壁Wの壁厚や根入れ深さ等を算出することが一般的である。従って、特許文献1、2に記載の鋼矢板擁壁においても、増加土圧P2を考慮した荷重に対して鋼矢板のサイズや板厚を算出するとともに、溶接固定するH形鋼のサイズや板厚、控え壁や支圧壁の長さ等を算出することになる。   By the way, when constructing a building or drainage facility on the front side of the earth retaining wall, as shown in FIG. 6, the ground near the earth retaining wall W may be excavated and thus excavated on the front ground G1. When the portion B is formed, the step D2 with the back ground G2 is increased, and the back earth pressure P (= P1 + P2) is increased. For this reason, when designing the earth retaining wall, the wall thickness, depth of penetration, etc. of the earth retaining wall W are calculated in consideration of not only the rear earth pressure P1 at the predetermined step D1 but also the increased earth pressure P2. It is common. Therefore, also in the steel sheet pile retaining wall described in Patent Literatures 1 and 2, the size and thickness of the steel sheet pile are calculated for the load in consideration of the increased earth pressure P2, and the size and plate of the H-shaped steel to be fixed by welding. The thickness, the length of the retaining wall and the bearing wall, etc. are calculated.

特開2008−175029号公報JP 2008-175029 A 特許第3072065号公報Japanese Patent No. 3072065

しかしながら、従来の鋼矢板擁壁のように、鋼矢板にH形鋼を溶接固定したり、控え壁や支圧壁を連結したりすると、これらのH形鋼や控え壁、支圧壁が鋼矢板擁壁の背面側に突出することから、背面側の敷地における有効利用可能な面積が減少したり、敷地内に構築する建物等の基礎や地下の設置領域が制限されたりなどの不都合が生じてしまう。
また、従来の土留め壁の設計方法では、増加土圧P2も考慮した背面土圧P(=P1+P2)に対して鋼矢板やH形鋼、控え壁や支圧壁を設計することになるため、所定段差に対して設計するよりも部材サイズや板厚が増加してしまい、材料コストや施工コストが増大するという不都合が生じる。
However, as with conventional steel sheet pile retaining walls, when H-shaped steel is welded and fixed to a steel sheet pile, or when a retaining wall or bearing wall is connected, these H-shaped steel, retaining wall, and bearing wall are steel. Since it protrudes to the back side of the sheet pile retaining wall, there are inconveniences such as the area that can be used effectively on the back side of the site is reduced, and the foundation of the building etc. built in the site and the basement installation area are restricted. End up.
Further, in the conventional retaining wall design method, steel sheet piles, H-shaped steel, retaining walls and bearing walls are designed for the rear earth pressure P (= P1 + P2) in consideration of the increased earth pressure P2. The member size and the plate thickness are increased as compared with the case of designing with respect to the predetermined step, resulting in an inconvenience that the material cost and the construction cost are increased.

本発明の目的は、背面地盤側の敷地の有効利用を図ることができるとともに土圧の増加に対しても経済的に設計することができる鋼矢板擁壁およびその設計方法を提供することにある。   An object of the present invention is to provide a steel sheet pile retaining wall that can be effectively used for a site on the back ground side and can be economically designed against an increase in earth pressure, and a design method thereof. .

本発明の鋼矢板擁壁は、断面屈曲状に形成された鋼矢板で背面土圧を支持する鋼矢板擁壁であって、前記鋼矢板には、背面側に延びて背面土に貫入される1枚または複数枚の板状部材が固定され、前記板状部材は、前記鋼矢板の背面側の側面よりも前面側に位置して設けられ、板厚が前記鋼矢板の板厚以上であり、上端が前記鋼矢板の上端より低く、下端が前記鋼矢板の下端より高く、かつ前面側掘削土の表面位置を跨いで設けられていることを特徴とする。 The steel sheet pile retaining wall of the present invention is a steel sheet pile retaining wall that supports a back earth pressure with a steel sheet pile formed in a bent cross section, and extends to the back side and penetrates into the back soil. One or a plurality of plate-like members are fixed, the plate-like member is provided on the front side with respect to the side surface on the back side of the steel sheet pile , and the plate thickness is equal to or greater than the plate thickness of the steel sheet pile. The upper end is lower than the upper end of the steel sheet pile, the lower end is higher than the lower end of the steel sheet pile, and is provided across the surface position of the front-side excavated soil .

以上の本発明によれば、鋼矢板の背面側に固定した板状部材が背面土中に貫入されるが、この板状部材は鋼矢板の背面側の側面よりも前面側に位置する、つまり板状部材が鋼矢板よりも背面側に突出しないようにしたことで、当該鋼矢板擁壁の壁厚を増加させずかつ背面地盤に控え壁等が存在しないようにでき、背面地盤側の敷地の有効利用を図ることができる。また、板状部材を背面土に貫入することで、この板状部材と背面土との摩擦力を得ることができる。従って、前面地盤を掘削して増加土圧が生じた場合であっても、背面地盤が静止している状態(静止土圧状態)であれば、板状部材と背面土との摩擦力によって土圧の増加分を負担することができ、鋼矢板のサイズや板厚を増加させなくてもよいことから当該鋼矢板擁壁を経済的に設計することができる。 According to the present invention described above, the plate-like member fixed on the back side of the steel sheet pile is inserted into the back soil, but this plate-like member is located on the front side of the side surface on the back side of the steel sheet pile, that is, By preventing the plate-shaped member from projecting to the back side of the steel sheet pile, the wall thickness of the steel sheet pile retaining wall can be prevented from increasing, and there can be no retaining wall etc. on the back ground. Can be used effectively. Moreover, the frictional force of this plate-shaped member and back soil can be obtained by penetrating the plate-shaped member into the back soil. Therefore, even if an increased earth pressure is generated by excavating the front ground, if the back ground is in a stationary state (static earth pressure state), the soil is caused by the frictional force between the plate member and the back soil. Since the increase in pressure can be borne and the size and thickness of the steel sheet pile need not be increased, the steel sheet pile retaining wall can be economically designed.

この際、本発明の鋼矢板擁壁では、前記板状部材は、板厚が前記鋼矢板の板厚以上であり、上端が前記鋼矢板の上端より低く、下端が前記鋼矢板の下端より高く、かつ前面側掘削土の表面位置を跨いで設けられている。
このような構成によ、鋼矢板の長さ寸法よりも板状部材の上下長さ短くなり、板状部材の材料コストや溶接手間等に伴う加工コストを必要最低限まで低減でき、板状部材を固定した鋼矢板の重量増加を必要最小限に抑制できることから施工性を向上させることができる。また、板状部材の板厚寸法は、鋼矢板の板厚寸法と同等以上に設定されているので、地盤への打設時の変形を防止することができる。さらに、板状部材は、上端が前記鋼矢板の上端より低く設定されているため、バイブロチャック等の打設機械で鋼矢板の上端部を保持することができ、下端が前記鋼矢板の下端より高く設定され、つまり鋼矢板下端部には取り付けないため、鋼矢板下端部での打設抵抗の増加を防ぐことができる。さらに、前面側掘削土の表面位置を跨いで板状部材を設置することで、増加土圧を受けた際に鋼矢板の曲げ変形が最も大きく発生しやすいその上下近傍位置において、板状部材と背面土との摩擦力による支持で効果的に鋼矢板の変形を抑制することができる。
本発明の鋼矢板擁壁では、前記鋼矢板は、断面中央に位置する第1フランジと、この第1フランジの両側端縁に連続する一対のウェブと、これら一対のウェブの先端縁から前記第1フランジと平行かつ外方に延びる一対の第2フランジと、これら一対の第2フランジの先端縁に設けられる一対の継手部とを有したハット形鋼矢板であることが好ましい。
At this time, in the steel sheet pile retaining wall of the present invention, the plate-like member has a plate thickness equal to or greater than the plate thickness of the steel sheet pile, an upper end is lower than the upper end of the steel sheet pile, and a lower end is higher than the lower end of the steel sheet pile. and that has been kicked set across the surface position of the front side excavated soil.
Ri by such a structure, than the length of the steel sheet pile becomes shorter vertical length of the plate-like member, it can be reduced to minimum processing cost associated with the material cost and the welding time or the like of the plate-like member, a plate Since the increase in the weight of the steel sheet pile to which the shaped member is fixed can be suppressed to the necessary minimum, the workability can be improved. Moreover, since the plate | board thickness dimension of the plate-shaped member is set to be equal to or greater than the plate thickness dimension of the steel sheet pile, it is possible to prevent deformation at the time of placing on the ground. Furthermore, since the upper end of the plate-like member is set lower than the upper end of the steel sheet pile, the upper end portion of the steel sheet pile can be held by a driving machine such as a vibro chuck, and the lower end is lower than the lower end of the steel sheet pile. Since it is set high, that is, it is not attached to the lower end portion of the steel sheet pile, it is possible to prevent an increase in driving resistance at the lower end portion of the steel sheet pile. Furthermore, by installing a plate-like member across the surface position of the front-side excavated soil, the plate-like member is located at a position near the top and bottom where bending deformation of the steel sheet pile is most likely to occur when subjected to increased earth pressure. The deformation of the steel sheet pile can be effectively suppressed by the support by the frictional force with the back soil.
In the steel sheet pile retaining wall according to the present invention, the steel sheet pile includes a first flange located at the center of the cross section, a pair of webs continuous to both side edges of the first flange, and the first edge from the leading edges of the pair of webs. It is preferable that it is a hat-shaped steel sheet pile having a pair of second flanges extending parallel to the one flange and extending outward, and a pair of joint portions provided at the tip edges of the pair of second flanges.

さらに、本発明の鋼矢板擁壁では、前記板状部材は、表面に凹凸が形成された縞鋼板で構成されるか、または表面に溶接した鋼材からなる突起を有して構成されていることが好ましい。
このような構成によれば、縞鋼板の凹凸や鋼材からなる突起を設けることで、板状部材と背面土との摩擦力を増大させて増加土圧に対する支持力を向上させることができる。
Furthermore, in the steel sheet pile retaining wall of the present invention, the plate-like member is constituted by a striped steel plate having irregularities formed on the surface, or has a protrusion made of a steel material welded to the surface. Is preferred.
According to such a configuration, by providing the projections and depressions of the striped steel plate and the steel material, it is possible to increase the frictional force between the plate-like member and the back soil and improve the supporting force against the increased earth pressure.

さらに、本発明の鋼矢板擁壁では、前記板状部材の背面側端縁には、当該板状部材の板厚方向に膨出する膨出部または板厚方向に延びる延出部が形成されていることが好ましい。
このような構成によれば、板状部材の背面側端縁に膨出部や延出部を形成して背面土と幾何学的に係合させることで、この係合力が加わることにより増加土圧に対する支持力をさらに向上させることができる。
Furthermore, in the steel sheet pile retaining wall of the present invention, a bulging portion that bulges in the plate thickness direction of the plate-like member or an extension portion that extends in the plate thickness direction is formed on the rear side edge of the plate-like member. It is preferable.
According to such a configuration, the bulging portion and the extending portion are formed on the rear side edge of the plate-like member and geometrically engaged with the back soil, and this engagement force is applied to increase the soil. The supporting force against pressure can be further improved.

一方、本発明の鋼矢板擁壁の設計方法は、断面屈曲状に形成された鋼矢板を用いて背面土圧を支持する前記いずれかの鋼矢板擁壁の設計方法であって、前面側と背面側との所定段差における背面土圧を支持可能に前記鋼矢板を設計し、前記所定段差よりもさらに前面地盤を掘削して段差が大きくなった際の増加土圧を、前記鋼矢板の背面側に延びて固定される板状部材と背面土との摩擦力で支持可能に当該板状部材を設計することを特徴とする。   On the other hand, the design method of the steel sheet pile retaining wall of the present invention is a design method of any one of the steel sheet pile retaining walls supporting a back earth pressure using a steel sheet pile formed in a cross-sectionally bent shape, The steel sheet pile is designed to be able to support the back side earth pressure at a predetermined step with the back side, and the increased earth pressure when the step is increased by excavating the front ground further than the predetermined step, the back side of the steel sheet pile The plate member is designed so as to be supported by the frictional force between the plate member and the back soil extending and fixed to the side.

このような本発明によれば、板状部材と背面土との摩擦力によって増加土圧を支持可能に板状部材を設計することで、所定段差における背面土圧を支持可能に設計した鋼矢板のサイズや板厚等を増加させる必要がないため、鋼矢板擁壁を経済的に設計することができる。   According to the present invention, the steel sheet pile designed to support the back surface earth pressure at a predetermined level by designing the plate member so that the increased earth pressure can be supported by the frictional force between the plate member and the back surface soil. Since there is no need to increase the size, thickness, etc., the steel sheet pile retaining wall can be designed economically.

以上のような本発明の鋼矢板擁壁およびその設計方法によれば、板状部材が鋼矢板よりも背面側に突出しないことから、背面地盤側の敷地の有効利用を図ることができるとともに、板状部材と背面土との摩擦力によって増加土圧を支持することで、鋼矢板のサイズや板厚等を増加させる必要がないため、鋼矢板擁壁を経済的に設計することができる。   According to the steel sheet pile retaining wall and the design method of the present invention as described above, since the plate-like member does not protrude to the back side than the steel sheet pile, effective utilization of the site on the back ground side can be achieved, By supporting the increased earth pressure by the frictional force between the plate-like member and the back soil, there is no need to increase the size and thickness of the steel sheet pile, and therefore the steel sheet pile retaining wall can be designed economically.

本発明の一実施形態に係る鋼矢板擁壁を示す断面図である。It is sectional drawing which shows the steel sheet pile retaining wall which concerns on one Embodiment of this invention. 前記鋼矢板擁壁を示す斜視図である。It is a perspective view which shows the said steel sheet pile retaining wall. 前記鋼矢板擁壁を示す断面図である。It is sectional drawing which shows the said steel sheet pile retaining wall. 前記鋼矢板擁壁の変形例を示す断面図である。It is sectional drawing which shows the modification of the said steel sheet pile retaining wall. 前記鋼矢板擁壁の他の変形例を示す断面図である。It is sectional drawing which shows the other modification of the said steel sheet pile retaining wall. 鋼矢板擁壁に作用する土圧を説明する図である。It is a figure explaining the earth pressure which acts on a steel sheet pile retaining wall.

以下、本発明の一実施形態を図面に基づいて説明する。
図1〜図3において、鋼矢板擁壁1は、傾斜地における前面地盤G1と背面地盤G2の段差部において背面土Sの土圧を支持する土留め壁として利用されるものであって、複数の鋼矢板2を左右に連結した壁体として構成されている。鋼矢板2は、断面中央に位置する第1フランジ21と、この第1フランジ21の両側端縁に連続する一対のウェブ22と、これら一対のウェブ22の先端縁から第1フランジ21と平行かつ外方に延びる一対の第2フランジ23と、これら一対の第2フランジ23の先端縁に設けられる一対の継手部24とを有したハット形鋼矢板であり、隣り合う鋼矢板2の継手部24同士を係合することで連結されている。このような鋼矢板2では、第1フランジ21の前面側表面と継手部24の背面側端面との外面間距離である鋼矢板断面高さHを有し、この鋼矢板断面高さHが鋼矢板擁壁1の壁厚寸法になっている。
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 to 3, the steel sheet pile retaining wall 1 is used as a retaining wall that supports the earth pressure of the back soil S at a step portion between the front ground G1 and the back ground G2 in an inclined ground. It is comprised as the wall body which connected the steel sheet pile 2 to right and left. The steel sheet pile 2 is parallel to the first flange 21 from the first flange 21 located at the center of the cross section, a pair of webs 22 continuing to both side edges of the first flange 21, and the leading edges of the pair of webs 22. A hat-shaped steel sheet pile having a pair of second flanges 23 extending outward and a pair of joint portions 24 provided at the leading edges of the pair of second flanges 23, and joint portions 24 of adjacent steel sheet piles 2. It is connected by engaging each other. In such a steel sheet pile 2, it has the steel sheet pile cross-section height H which is the distance between the outer surfaces of the front side surface of the 1st flange 21, and the back side end surface of the coupling part 24, and this steel sheet pile cross-section height H is steel. It is the wall thickness dimension of the sheet pile retaining wall 1.

鋼矢板2の第1フランジ21には、背面側に延びて背面土Sに貫入される板状部材3が溶接固定されている。この板状部材3は、鋼矢板2の長さ寸法Lよりも短い長さ寸法L1を有し、鋼矢板2の上端縁よりも高さ寸法L2だけ下がった位置から、鋼矢板2の下端(先端)縁よりも高さ寸法L3だけ高い位置までの間であって、前面地盤G1の表面および掘削部Bの底面の両方の高さ位置を跨いで設けられている。ここで、鋼矢板2の上端縁よりも板状部材3を低くする高さ寸法L2としては、鋼矢板2の上端部を保持するバイブロチャック等の打設機械の所要寸法以上で、例えば500mm以上に設定されていればよい。また、板状部材3の背面側への幅寸法は、その先端が鋼矢板2の背面側の側面Mよりも前面側に位置する、すなわち、板状部材3が鋼矢板擁壁1の壁厚範囲内に位置して背面側に突出しないように設定されている。   A plate-like member 3 extending to the back side and penetrating into the back soil S is welded and fixed to the first flange 21 of the steel sheet pile 2. The plate-like member 3 has a length dimension L1 that is shorter than the length dimension L of the steel sheet pile 2, and from the position lower than the upper end edge of the steel sheet pile 2 by the height dimension L2, the lower end of the steel sheet pile 2 ( It is provided between the height of both the surface of the front ground G1 and the bottom of the excavation part B, up to a position higher than the front edge) by the height dimension L3. Here, the height L2 for lowering the plate-like member 3 below the upper edge of the steel sheet pile 2 is not less than the required dimension of a driving machine such as a vibro chuck that holds the upper end of the steel sheet pile 2, for example, 500 mm or more. As long as it is set to. Moreover, the width dimension to the back side of the plate-like member 3 is such that the tip is located on the front side with respect to the side M on the back side of the steel sheet pile 2, that is, the plate-like member 3 has a wall thickness of the steel sheet pile retaining wall 1. It is set within the range so as not to protrude to the back side.

このような板状部材3は、図2に示すように、表面に凹凸31が形成された縞鋼板で構成されており、貫入された背面土Sとの間に摩擦力が発生するようになっている。そして、図3(A)に示すように、1本の鋼矢板2の第1フランジ21に1枚の板状部材3が固定されていてもよいし、必要とされる摩擦力が大きい場合には、図3(B)に示すように、1本の鋼矢板2の第1フランジ21に2枚あるいは3枚以上の板状部材3が固定されていてもよい。さらに、板状部材3は、縞鋼板の平板から構成されるものに限らず、図4(A)に示すように、その背面側端縁から板厚方向に延びる延出部32が固定されて断面略T字形に形成されたものでもよいし、図4(B)に示すように、その背面側端縁に鉄筋等を固定して板厚方向に膨出する膨出部33を有したものであってもよい。また、図4(C)に示すように、板状部材3の表面に溶接固定した複数の鉄筋34等によって突起が形成されていてもよい。また、板状部材3の板厚寸法は、地盤への打設時の変形を防止するために、鋼矢板2の板厚寸法と同等以上に設定されていることが望ましい。   As shown in FIG. 2, such a plate-like member 3 is composed of a striped steel plate having irregularities 31 formed on the surface, and a frictional force is generated between the penetrating back soil S. ing. And as shown to FIG. 3 (A), when the one plate-shaped member 3 may be fixed to the 1st flange 21 of the one steel sheet pile 2, and the required frictional force is large, As shown in FIG. 3B, two or three or more plate-like members 3 may be fixed to the first flange 21 of one steel sheet pile 2. Furthermore, the plate-like member 3 is not limited to a striped steel plate, and as shown in FIG. 4 (A), an extending portion 32 extending in the plate thickness direction from the rear side edge is fixed. It may be formed in a substantially T-shaped cross section, and as shown in FIG. 4 (B), has a bulging portion 33 that bulges in the plate thickness direction with a reinforcing bar or the like fixed to the rear side edge. It may be. Further, as shown in FIG. 4 (C), a projection may be formed by a plurality of reinforcing bars 34 and the like that are welded and fixed to the surface of the plate-like member 3. Further, it is desirable that the plate thickness of the plate-like member 3 is set to be equal to or greater than the plate thickness of the steel sheet pile 2 in order to prevent deformation at the time of placing on the ground.

以下、板状部材3の設計例を示す。
設計条件としては、擁壁の壁高さ(所定段差)D1を3m、前面地盤G1の掘削部B深さD3を1.5mとし、地盤の単位体積重量を18kN/m3 、地盤のN値を15とした。従って、掘削部Bの掘削に伴う土圧の増加分(増加土圧P2)は、50.6kN/mと算出される。
また、地盤を砂質土として、「道路橋示方書(社団法人日本道路協会)」に基づき、板状部材3との単位面積あたりの摩擦力を30kN/m2 に設定した。そして、幅寸法が0.287mで長さ寸法L1が6mの板状部材3を1枚固定するように設定すると、板状部材3と背面土Sとの摩擦力は、57.4kN/mと算出される。
以上のように、板状部材3の幅、長さおよび枚数を設定することで、掘削部Bの掘削による増加土圧P2を板状部材3の摩擦抵抗力が上回るようにでき、増加土圧P2を板状部材3の摩擦抵抗によって支持することができる。
Hereinafter, design examples of the plate-like member 3 will be shown.
As design conditions, the wall height (predetermined step) D1 of the retaining wall is 3 m, the excavation part B depth D3 of the front ground G1 is 1.5 m, the unit volume weight of the ground is 18 kN / m 3 , and the N value of the ground Was set to 15. Therefore, the increase in earth pressure (increase earth pressure P2) accompanying excavation of the excavation part B is calculated as 50.6 kN / m.
In addition, with the ground as sandy soil, the frictional force per unit area with the plate member 3 was set to 30 kN / m 2 based on the “Road Bridge Specification (Japan Road Association)”. And if it sets so that the plate-shaped member 3 with a width dimension of 0.287m and length dimension L1 of 6m may be fixed, the frictional force of the plate-shaped member 3 and the back soil S is 57.4 kN / m. Calculated.
As described above, by setting the width, length, and number of the plate-like members 3, the increased earth pressure P <b> 2 due to excavation of the excavation part B can exceed the frictional resistance force of the plate-like member 3, and the increased earth pressure P2 can be supported by the frictional resistance of the plate-like member 3.

以上の本実施形態によれば、以下のような効果が得られる。
すなわち、板状部材3が鋼矢板擁壁1の壁厚範囲から背面側に突出しないので、鋼矢板擁壁1の壁厚が厚くなって背面地盤G2の敷地を圧迫することがなく、背面側の敷地の有効利用を図ることができる。また、板状部材3と背面土Sとの摩擦抵抗力によって増加土圧P2を支持することができるので、鋼矢板2のサイズや板厚を増加させなくてもよいことから、鋼矢板擁壁1を経済的に設計することができる。
さらに、凹凸31を有した縞鋼板から板状部材3を構成したり、板状部材3の表面に鉄筋34等によって凹凸を形成したりすることで、板状部材3と背面土Sとの摩擦力を増大させて増加土圧P2に対する支持力を向上させることができる。また、板状部材3の枚数を増やしたり、板状部材3の先端に延出部32や膨出部33を形成したりすることで、支持力をさらに向上させることができる。
According to the above embodiment, the following effects can be obtained.
That is, since the plate-like member 3 does not protrude from the wall thickness range of the steel sheet pile retaining wall 1 to the back side, the wall thickness of the steel sheet pile retaining wall 1 does not increase and does not press the site of the back ground G2, and the back side Can be used effectively. Further, since the increased earth pressure P2 can be supported by the frictional resistance between the plate-like member 3 and the back soil S, the size and thickness of the steel sheet pile 2 need not be increased. 1 can be designed economically.
Further, the plate-like member 3 is composed of a striped steel plate having the unevenness 31, or the unevenness is formed on the surface of the plate-like member 3 by a reinforcing bar 34 or the like, whereby the friction between the plate-like member 3 and the back soil S. By increasing the force, the supporting force against the increased earth pressure P2 can be improved. Further, the supporting force can be further improved by increasing the number of the plate-like members 3 or by forming the extending portion 32 or the bulging portion 33 at the tip of the plate-like member 3.

なお、本発明は、前記実施形態に限定されるものではなく、本発明の目的を達成できる他の構成等を含み、以下に示すような変形等も本発明に含まれる。
例えば、前記実施形態ではハット形鋼矢板からなる鋼矢板2を例示したが、本発明の鋼矢板としては、ハット形鋼矢板に限らず、U形鋼矢板やZ形鋼矢板など他の形態の鋼矢板も利用可能である。U形鋼矢板を用いた鋼矢板擁壁の変形例を図5に基づいて説明する。
In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the said embodiment, although the steel sheet pile 2 which consists of a hat-shaped steel sheet pile was illustrated, as a steel sheet pile of this invention, not only a hat-shaped steel sheet pile but other forms, such as a U-shaped steel sheet pile and a Z-shaped steel sheet pile. Steel sheet piles are also available. A modification of the steel sheet pile retaining wall using the U-shaped steel sheet pile will be described with reference to FIG.

図5において、鋼矢板擁壁1Aは、フランジ25と、このフランジ25の両側端縁に連続する一対のウェブ26と、これら一対のウェブ26の先端縁に設けられる一対の継手部27とを有したU形の鋼矢板2Aを表裏交互に連結して構成されている。このような鋼矢板2Aでは、隣り合う一対の鋼矢板2Aのフランジ25表面間の距離によって鋼矢板断面高さHが決まり、この鋼矢板断面高さHが鋼矢板擁壁1Aの壁厚寸法になっている。そして、板状部材3は、前面側に凸な鋼矢板2Aのフランジ25から背面側に延びて固定され、この板状部材3が鋼矢板擁壁1Aの壁厚範囲内に位置して背面側に突出しないように設定されている。   In FIG. 5, the steel sheet pile retaining wall 1 </ b> A has a flange 25, a pair of webs 26 that are continuous with both side edges of the flange 25, and a pair of joint portions 27 that are provided at the leading edges of the pair of webs 26. The U-shaped steel sheet piles 2A are alternately connected to the front and back. In such a steel sheet pile 2A, the steel sheet pile cross-sectional height H is determined by the distance between the flange 25 surfaces of a pair of adjacent steel sheet piles 2A, and this steel sheet pile cross-sectional height H is the wall thickness dimension of the steel sheet pile retaining wall 1A. It has become. And the plate-shaped member 3 is extended and fixed to the back side from the flange 25 of the steel sheet pile 2A convex to the front side, and this plate-shaped member 3 is located in the wall thickness range of the steel sheet pile retaining wall 1A and is on the back side. It is set not to protrude.

その他、本発明を実施するための最良の構成、方法などは、以上の記載で開示されているが、本発明は、これに限定されるものではない。すなわち、本発明は、主に特定の実施形態に関して特に図示され、かつ説明されているが、本発明の技術的思想および目的の範囲から逸脱することなく、以上述べた実施形態に対し、形状、材質、数量、その他の詳細な構成において、当業者が様々な変形を加えることができるものである。
従って、上記に開示した形状、材質などを限定した記載は、本発明の理解を容易にするために例示的に記載したものであり、本発明を限定するものではないから、それらの形状、材質などの限定の一部もしくは全部の限定を外した部材の名称での記載は、本発明に含まれるものである。
In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

1,1A…鋼矢板擁壁、2,2A…鋼矢板、3…板状部材、31…凹凸、32…延出部、33…膨出部、34…鉄筋(突起)、S…背面土。   DESCRIPTION OF SYMBOLS 1,1A ... Steel sheet pile retaining wall, 2, 2A ... Steel sheet pile, 3 ... Plate-like member, 31 ... Concavity and convexity, 32 ... Extension part, 33 ... Expansion part, 34 ... Reinforcement (protrusion), S ... Back soil.

Claims (5)

断面屈曲状に形成された鋼矢板で背面土圧を支持する鋼矢板擁壁であって、
前記鋼矢板には、背面側に延びて背面土に貫入される1枚または複数枚の板状部材が固定され、
前記板状部材は、前記鋼矢板の背面側の側面よりも前面側に位置して設けられ、板厚が前記鋼矢板の板厚以上であり、上端が前記鋼矢板の上端より低く、下端が前記鋼矢板の下端より高く、かつ前面側掘削土の表面位置を跨いで設けられていることを特徴とする鋼矢板擁壁。
A steel sheet pile retaining wall that supports the back earth pressure with a steel sheet pile formed in a cross-sectionally bent shape,
In the steel sheet pile, one or a plurality of plate-like members extending to the back side and penetrating into the back soil are fixed,
The plate-like member is provided on the front side rather than the back side surface of the steel sheet pile , the plate thickness is equal to or greater than the plate thickness of the steel sheet pile, the upper end is lower than the upper end of the steel sheet pile, and the lower end is A steel sheet pile retaining wall characterized by being provided higher than the lower end of the steel sheet pile and straddling the surface position of the front-side excavated soil .
請求項1に記載の鋼矢板擁壁において、
前記鋼矢板は、断面中央に位置する第1フランジと、この第1フランジの両側端縁に連続する一対のウェブと、これら一対のウェブの先端縁から前記第1フランジと平行かつ外方に延びる一対の第2フランジと、これら一対の第2フランジの先端縁に設けられる一対の継手部とを有したハット形鋼矢板であることを特徴とする鋼矢板擁壁。
In the steel sheet pile retaining wall according to claim 1,
The steel sheet pile extends in parallel and outward with the first flange from a first flange located at the center of the cross section, a pair of webs continuous to both side edges of the first flange, and tip edges of the pair of webs. A steel sheet pile retaining wall characterized by being a hat-shaped steel sheet pile having a pair of second flanges and a pair of joint portions provided at the leading edges of the pair of second flanges .
請求項1または請求項2に記載の鋼矢板擁壁において、
前記板状部材は、表面に凹凸が形成された縞鋼板で構成されるか、または表面に溶接した鋼材からなる突起を有して構成されていることを特徴とする鋼矢板擁壁。
In the steel sheet pile retaining wall according to claim 1 or 2,
The steel sheet pile retaining wall, wherein the plate-like member is constituted by a striped steel plate having irregularities formed on a surface thereof, or has a protrusion made of a steel material welded to the surface.
請求項1から請求項3のいずれかに記載の鋼矢板擁壁において、
前記板状部材の背面側端縁には、当該板状部材の板厚方向に膨出する膨出部または板厚方向に延びる延出部が形成されていることを特徴とする鋼矢板擁壁。
In the steel sheet pile retaining wall according to any one of claims 1 to 3,
A steel sheet pile retaining wall characterized in that a bulging portion that bulges in the plate thickness direction of the plate-like member or an extending portion that extends in the plate thickness direction is formed at the rear side edge of the plate-like member. .
断面屈曲状に形成された鋼矢板を用いて背面土圧を支持する請求項1から請求項4のいずれかに記載の鋼矢板擁壁の設計方法であって、
前面側と背面側との所定段差における背面土圧を支持可能に前記鋼矢板を設計し、
前記所定段差よりもさらに前面地盤を掘削して段差が大きくなった際の増加土圧を、前記鋼矢板の背面側に延びて固定される板状部材と背面土との摩擦力で支持可能に当該板状部材を設計することを特徴とする鋼矢板擁壁の設計方法。
It is a design method of the steel sheet pile retaining wall according to any one of claims 1 to 4, wherein the rear earth pressure is supported using a steel sheet pile formed in a cross-sectionally bent shape.
The steel sheet pile is designed to be able to support the back earth pressure at a predetermined step between the front side and the back side,
It is possible to support the increased earth pressure when excavating the front ground further than the predetermined step and the step becomes larger with the frictional force between the plate-like member that is extended and fixed to the back side of the steel sheet pile and the back soil. A method for designing a steel sheet pile retaining wall, wherein the plate-like member is designed.
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