JP2012188923A - Earth retaining wall reinforcing structure and method - Google Patents

Earth retaining wall reinforcing structure and method Download PDF

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JP2012188923A
JP2012188923A JP2012110580A JP2012110580A JP2012188923A JP 2012188923 A JP2012188923 A JP 2012188923A JP 2012110580 A JP2012110580 A JP 2012110580A JP 2012110580 A JP2012110580 A JP 2012110580A JP 2012188923 A JP2012188923 A JP 2012188923A
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retaining wall
steel wire
wall member
earth
earth retaining
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JP5516643B2 (en
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Kazuyuki Tazaki
和之 田崎
Munehiro Ishida
宗弘 石田
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Nippon Steel Corp
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Nippon Steel Corp
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Abstract

PROBLEM TO BE SOLVED: To inhibit the deformation of an earth retaining wall member by improving the rigidity of a steel member for the earth retaining wall member, while efficiently inhibiting the deformation thereof, reducing a construction cost and a construction period and also minimizing a required site area.SOLUTION: For an earth retaining member 4 built in soil, a plurality of steel members 11 are provided so that locking members at the upper ends have different fastening positions in the depth direction of the earth retaining member 4. In the case, tensioning force is introduced into a steel rod material 11 located on the upper side and a steel rod material 11 located on the lower side, in that order, stepwise depending on the excavation depth of excavation side sediment. Specifically, the tensioning force is introduced into the upper stage of the earth retaining member 4 throughout one stage, and in the progression phase of front excavation to some extent, the tensioning force is introduced into the upper and medium stages of the earth retaining wall member 4 throughout two stages. Furthermore, in the progression phase of the front excavation deeper, the tensioning force is introduced into the upper, medium and lower stages of the earth retaining wall member 4 throughout three stages.

Description

本発明は、地中に設置された土留め壁鋼材の補強構造および方法に関する。   The present invention relates to a reinforcing structure and method for retaining wall steel installed in the ground.

従来から使用されている土留め壁は、鋼矢板、鋼管矢板、H型鋼矢板等の鋼製土留め壁やSMW等のようなH型鋼を芯材としてソイルセメント地中連続壁、そして鉄筋コンクリートの地中連続壁等がある。   The earth retaining walls that have been used in the past are steel earth retaining walls such as steel sheet piles, steel pipe sheet piles, H-shaped steel sheet piles, etc., and soil cement underground continuous walls using H-shaped steel such as SMW as the core, and reinforced concrete ground. There are medium continuous walls.

例えば、図15に示すように、土留め壁8は、地盤80からA方向に向けて土水圧を受けることになる。一般に土留め壁頂部81の曲げ変形量に応じて土留め壁8の部材断面等が決定され、時にはより高い剛性を有する部材が必要となる。特に鋼製材料で構成される土留め壁は、コンクリート系の土留め壁と比較してその傾向は大きくなる。   For example, as shown in FIG. 15, the earth retaining wall 8 receives earth water pressure from the ground 80 toward the A direction. In general, the member cross-section of the retaining wall 8 is determined according to the amount of bending deformation of the retaining wall top 81, and sometimes a member having higher rigidity is required. In particular, the tendency of a retaining wall made of steel material is greater than that of a concrete retaining wall.

通常、土留め壁における前面掘削深さが深くなる場合には、切梁支保工を使って土留め壁を補強して施工することになるが、例えば、片側にしか土留め壁が形成されない場合や、切梁支保工の面積が広くなる場合には、切梁支保工自体が困難、或いは不経済になる。かかる場合には、アンカー工法を併用した土留め壁を用いることになる。土留め壁前面から土留め壁背面に至る地盤にアンカーを施工し、固定するものであるが、土留め壁背面に民家等が存在する場合には、これを適用することが困難となる。このとき、自立土留め壁を構築することにより対処することが可能となるが、上述したように土留め壁の剛性に限界があるという問題点があった。   Normally, when the front excavation depth in the retaining wall becomes deep, it will be constructed by reinforcing the retaining wall using a beam support, but for example, when the retaining wall is formed only on one side If the area of the beam support is increased, the beam support itself is difficult or uneconomical. In such a case, a retaining wall combined with an anchor method is used. An anchor is constructed and fixed on the ground extending from the front of the retaining wall to the rear of the retaining wall. However, when a private house or the like is present on the rear of the retaining wall, it is difficult to apply this. At this time, it is possible to cope by constructing a self-supporting earth retaining wall, but there is a problem that the rigidity of the earth retaining wall is limited as described above.

一方、鋼製線材を緊張することにより、橋梁等の鋼桁を補強する方法も提案されている(例えば、特許文献1参照。)。しかし、このような補強方法は、あくまで水平方向へ鋼製線材を延長するものであり、しかも橋梁に発生する曲げ変形と、土留め壁頂部81の曲げ変形とは、互いにその大きさも異なり、地盤とのやり取りが発生して、分布傾向も異なるものである。さらに、土留め壁は地中に設置するものであるため、これに鋼製線材を取り付けた場合において、実際に緊張力が不要となり、当該鋼製線材を除去しなければならないケースが生じた場合に、従来の橋梁等の補強方法を単に転用するのみでは、これを具体化させることができないという問題点があった。   On the other hand, a method of reinforcing a steel girder such as a bridge by tensioning a steel wire rod has also been proposed (see, for example, Patent Document 1). However, such a reinforcing method extends the steel wire in the horizontal direction to the last, and the bending deformation generated in the bridge and the bending deformation of the earth retaining wall top 81 are also different in size from each other. There is a difference in distribution tendency. Furthermore, because the retaining wall is to be installed in the ground, when a steel wire is attached to it, there is a case where tension is not actually required and the steel wire has to be removed. In addition, there is a problem that this cannot be realized simply by diverting a conventional method of reinforcing a bridge or the like.

特開2003−269093号公報JP 2003-269093 A

そこで、本発明は、上述した問題点に鑑みて案出されたものであり、土留め壁の部材断面を大きくすることなく、土留め壁部材としての剛性を向上させることにより、工事費用を低減させるとともに施工期間の短縮を図り、更に必要な用地を極力少なくすることが可能な土留め壁の補強構造及び方法を提供することを目的とする。   Accordingly, the present invention has been devised in view of the above-described problems, and reduces the construction cost by improving the rigidity as the retaining wall member without increasing the member cross section of the retaining wall. It is another object of the present invention to provide a structure and a method for reinforcing a retaining wall capable of shortening the construction period and further reducing the necessary site as much as possible.

本発明を適用した土留め壁の補強方法は、上述した課題を解決するために、土留め壁部材の断面図芯より地山側に偏芯して上記土留め壁部材の略軸方向に沿った略直線状に管の内壁と間隙を設けた状態で挿入された鋼製線材が取り付けられた土留め壁部材を地盤中に建て込み、上記土留め壁部材が土水圧を受けて掘削側に曲げ変形しようとするものに抗して地山側に曲げ変形しようとする力が作用するように上記鋼製線材に緊張力を導入し、上記鋼製線材を挿入した管内に、セメントミルクを充填、固化することを特徴とする。   In order to solve the above-described problem, a method for reinforcing a retaining wall to which the present invention is applied is eccentric to the natural ground side from the cross-sectional center of the retaining wall member and extends along the substantially axial direction of the retaining wall member. A retaining wall member with a steel wire inserted in a state of being provided with a gap between the inner wall of the pipe in a substantially straight line is built in the ground, and the retaining wall member receives the soil pressure and bends to the excavation side. Tension force is introduced into the steel wire rod so that a force to bend and deform against the ground is against the object to be deformed, and cement milk is filled and solidified in the tube into which the steel wire rod is inserted. It is characterized by doing.

本発明を適用した土留め壁の補強方法は、上述した課題を解決するために、ウェブ鋼板の両端にフランジ鋼板が設けられた断面H形状の鋼材である土留め壁部材の地山側のフランジ鋼板における外面に鋼製線材の上端を取り付けるとともに、当該フランジ鋼板における内面に上記鋼製線材の下端を取り付け、上記土留め壁部材を建て込み、上記土留め壁部材が土水圧を受けて掘削側に曲げ変形しようとするものに抗して地山側に曲げ変形しようとする力が作用するように上記鋼製線材に緊張力を導入することを特徴とする。
また本発明を適用した土留め壁の補強方法は、上述した課題を解決するために、土留め壁部材の断面図芯より地山側に偏芯して上記土留め壁部材の略軸方向に沿って略直線状に構成した鋼製線材を、その上端部の係止部材の上記土留め壁部材深さ方向における固着位置が異なるように複数本設ける際に、上側に位置する鋼製線材から下側に位置する鋼製線材の順に、掘削側土砂の掘削深さに応じて段階的に緊張力を導入することを特徴とする。
In order to solve the above-described problem, a method for reinforcing a retaining wall to which the present invention is applied is a flange steel plate on the ground side of a retaining wall member, which is a steel material having an H-shaped cross section in which flange steel plates are provided at both ends of a web steel plate. At the same time, the upper end of the steel wire rod is attached to the outer surface of the steel plate, the lower end of the steel wire rod is attached to the inner surface of the flange steel plate, the retaining wall member is installed, and the retaining wall member is subjected to earth and water pressure on the excavation side. It is characterized in that a tension force is introduced into the steel wire rod so that a force to bend and deform acts on the natural ground side against what is to be bent and deformed.
Further, in order to solve the above-described problem, the method of reinforcing the retaining wall to which the present invention is applied is eccentric to the ground mountain side from the cross-sectional view center of the retaining wall member and extends along the substantially axial direction of the retaining wall member. When a plurality of steel wire rods configured in a substantially straight line are provided so that the fixing positions of the locking members at the upper end portions thereof in the depth direction of the retaining wall member are different, the steel wire rods are arranged below the steel wire rods located on the upper side. It is characterized in that tension is introduced stepwise in accordance with the excavation depth of the excavation-side earth and sand in the order of the steel wire rods located on the side.

上述した構成からなる本発明において、土留め壁部材は、鋼製線材により緊張力が付与されている。しかも、この鋼製線材は、背面側のフランジ鋼板に取り付けられているため、鋼製線材に対して緊張力を導入することにより、土留め壁部材は、背面側へ向けて曲げ応力が負荷されることになる。その結果、土留め壁部材は背面側へ向けて曲げ変形しようとすることになる。   In the present invention having the above-described configuration, the earth retaining wall member is given tension by a steel wire rod. Moreover, since this steel wire is attached to the flange-side steel plate on the back side, by introducing tension to the steel wire, the retaining wall member is subjected to bending stress toward the back side. Will be. As a result, the earth retaining wall member tends to bend and deform toward the back side.

本発明では、上述の如き土留め壁部材の背面側に取り付けられた鋼製線材により緊張力に基づき、当該土留め部材に対して背面側へ向けて曲げ変形しようとする力を働かせているため、土水圧に基づく応力に対して対抗することができる。その結果、土水圧に基づく土留め壁部材の上端部の前面側への変位量を抑えることが可能となる。   In the present invention, because the steel wire attached to the back side of the earth retaining wall member as described above exerts a force to bend and deform toward the back side of the earth retaining member based on the tension force. Can counteract stress based on soil water pressure. As a result, it is possible to suppress the amount of displacement of the upper end portion of the retaining wall member based on the earth water pressure toward the front side.

特に本発明では、鋼製線材をU字状に配置し、また係止部材に引っ掛けて固定することもできる。このため、滑車の原理により、鋼製線材に対する1回の緊張力導入により、2倍の緊張力を得ることが可能となる。   In particular, in the present invention, the steel wire can be arranged in a U-shape and can be fixed by being hooked on the locking member. For this reason, according to the principle of a pulley, it becomes possible to obtain twice the tension force by introducing the tension force once for the steel wire rod.

また、本発明では、土留め壁の機能が終了した後、緊張力が不要となった時、当該鋼製線材を除去することができる。つまり、この鋼製線材の端部を地上付近に位置させていることから、これを容易に引き上げることが可能となる。    Moreover, in this invention, when the tension | tensile_strength becomes unnecessary after the function of a retaining wall is complete | finished, the said steel wire can be removed. That is, since the end of this steel wire rod is positioned near the ground, it can be easily pulled up.

また、本発明では、土留め壁部材の剛性を向上させる代わりに上述した鋼製線材により土水圧に基づく上端部の変形を抑えることができるため、換言すれば土留め壁部材の剛性を向上させる必要が無くなる。このため、土留め壁部材の部材断面を大きくする必要も無くなり、工事費用を低減させることができ、施工期間の短縮化を図ることも可能となる。さらに、本発明では、土留め壁を構築するために必要な用地を極力少なくすることが可能となる。   Moreover, in this invention, since the deformation | transformation of the upper end part based on earth water pressure can be suppressed with the steel wire mentioned above instead of improving the rigidity of a retaining wall member, in other words, the rigidity of a retaining wall member is improved. There is no need. For this reason, it is not necessary to increase the member cross section of the retaining wall member, the construction cost can be reduced, and the construction period can be shortened. Furthermore, according to the present invention, it is possible to reduce the land necessary for constructing the retaining wall as much as possible.

本発明を適用した土留め壁の補強構造を示す図である。It is a figure which shows the reinforcement structure of the earth retaining wall to which this invention is applied. 土留め壁部材が埋め込まれた状態にある土留め壁の平面図である。It is a top view of the earth retaining wall in the state where the earth retaining wall member was embedded. 図2(a)B方向から見た土留め壁部材4の正面図である。FIG. 2 (a) is a front view of the earth retaining wall member 4 as viewed from the B direction. 本発明を適用した土留め壁の補強構造の作用について説明するための図である。It is a figure for demonstrating the effect | action of the reinforcement structure of the earth retaining wall to which this invention is applied. 本発明を適用した土留め壁の補強構造の作用について説明するための他の図である。It is another figure for demonstrating the effect | action of the reinforcement structure of the earth retaining wall to which this invention is applied. 本発明を適用した土留め壁の補強方法における他の適用例について説明するための図である。It is a figure for demonstrating the other application example in the reinforcement method of the earth retaining wall to which this invention is applied. 管内に鋼製線材を挿入することにより、これを取り付ける形態を示す図である。It is a figure which shows the form which attaches this by inserting a steel wire rod in a pipe | tube. 鋼製線材の配置方法における他の適用例を示す図である。It is a figure which shows the other application example in the arrangement | positioning method of a steel wire. 鋼製線材の配置方法における更なる他の適用例を示す図である。It is a figure which shows the further another example of application in the arrangement | positioning method of a steel wire. 鋼製線材の配置方法における他のバリエーションについて説明するための図である。It is a figure for demonstrating the other variation in the arrangement | positioning method of steel wires. フランジ鋼板の外面又は内面に鋼製線材の上下端を配置した図である。It is the figure which has arrange | positioned the steel wire rod upper and lower ends to the outer surface or inner surface of a flange steel plate. 鋼製線材を、土留め壁部材の背面側のみに設けた場合における問題点について説明するための図である。It is a figure for demonstrating the problem in the case of providing a steel wire only in the back side of a retaining wall member. 前面掘削の各段階に応じて多段に配置した鋼製線材を緊張することにより、効率的な変形抑制が可能とした例を示す図である。It is a figure which shows the example which enabled the efficient deformation | transformation suppression by tensioning the steel wire arrange | positioned in multiple steps according to each step of front surface excavation. 自立式の土留め壁構造における実際の曲げモーメント図、並びに変形分布図である。It is an actual bending moment figure in a self-supporting earth retaining wall structure, and a deformation distribution figure. 従来技術の問題点について説明するための図である。It is a figure for demonstrating the problem of a prior art.

以下、本発明を実施するための最良の形態として、土留め壁の補強構造について、図面を参照しながら詳細に説明する。   Hereinafter, as a best mode for carrying out the present invention, a reinforcing structure of a retaining wall will be described in detail with reference to the drawings.

本発明を適用した土留め壁の補強構造1は、例えば、図1に示すように道路2端部の地山5を留める山留め壁等として適用される土留め壁3を補強するものである。この土留め壁3は、鋼矢板、鋼管矢板、H型形状の鋼材等を使用した土留め壁部材4により具体化されるものである。以下の説明では、H型形状の鋼材を土留め壁部材4として構成する場合を例にとり説明をする。   The earth retaining wall reinforcing structure 1 to which the present invention is applied reinforces an earth retaining wall 3 applied as a retaining wall or the like for fastening a natural mountain 5 at the end of a road 2 as shown in FIG. The earth retaining wall 3 is embodied by an earth retaining wall member 4 using a steel sheet pile, a steel pipe sheet pile, an H-shaped steel material or the like. In the following description, a case where an H-shaped steel material is configured as the retaining wall member 4 will be described as an example.

図2(a)は、土留め壁部材4が埋め込まれた状態にある土留め壁3の平面図を示してい
る。また図3(a)は、図2(a)B方向から見た土留め壁部材4の正面図を示している。
Fig.2 (a) has shown the top view of the retaining wall 3 in the state by which the retaining wall member 4 was embedded. Moreover, Fig.3 (a) has shown the front view of the earth retaining wall member 4 seen from Fig.2 (a) B direction.

土留め壁部材4は、ウェブ鋼板41の両端にフランジ鋼板42a、42bが設けられてなる。このフランジ鋼板42a、42bの両端には、互いに隣接する他の土留め壁部材4におけるフランジ鋼板42a、42bと連結するための継ぎ手46a、46bがそれぞれ設けられている。また、土留め壁部材4は、地山5側にフランジ鋼板42aが、道路2側にフランジ鋼板42bが位置するように、配置されるものとする。即ち、フランジ鋼板4
2aは、地山5からの土水圧を受ける背面側に位置することになり、フランジ鋼板42bは、道路2に面する前面側に位置することになる。
The retaining wall member 4 includes flange steel plates 42 a and 42 b provided at both ends of a web steel plate 41. At both ends of the flange steel plates 42a and 42b, joints 46a and 46b for connecting to the flange steel plates 42a and 42b in the other retaining wall members 4 adjacent to each other are provided. Moreover, the retaining wall member 4 shall be arrange | positioned so that the flange steel plate 42a may be located in the natural ground 5 side, and the flange steel plate 42b may be located in the road 2 side. That is, flange steel plate 4
2a will be located in the back side which receives the earth-water pressure from the natural ground 5, and the flange steel plate 42b will be located in the front side which faces the road 2. FIG.

図2(b)は、継ぎ手の構成を省略し、単にH型形状の鋼材60を並列配置した土留め壁3の平面図を示している。継ぎ手の構成を省略しても、以下に説明する本発明所期の作用効果を得ることができることは勿論である。   FIG. 2B is a plan view of the earth retaining wall 3 in which the configuration of the joint is omitted and the H-shaped steel members 60 are simply arranged in parallel. Of course, even if the configuration of the joint is omitted, it is possible to obtain the intended effects of the present invention described below.

フランジ鋼板42aの背面側には、金具44が上端部において取り付けられ、また下部には係止部材48が取り付けられている。   A metal fitting 44 is attached at the upper end on the back side of the flange steel plate 42a, and a locking member 48 is attached at the lower part.

金具44は、少なくとも上下に亘り貫通孔が形成されているものであればいかなる構成であってもよいが、例えば図2(c),(d)に示すように下方に向けて先細状のテーパ57が形成された貫通孔56を備えるものであってもよい。この金具44は、溶接55等の手段により、フランジ鋼板42aの背面側に取り付けられている。   The metal fitting 44 may have any configuration as long as a through-hole is formed at least vertically. For example, as shown in FIGS. 2 (c) and 2 (d), the taper is tapered downward. You may provide the through-hole 56 in which 57 was formed. The metal fitting 44 is attached to the back side of the flange steel plate 42a by means such as welding 55.

係止部材48は、下向きに湾曲部が設けられた形状で構成されていてもよい。この係止部材48は、後述する鋼製線材を係止可能な程度に溝が形成された形状を用いてもよい。また、図3(c)に示すように、溝が形成されただけの形状で構成されていてもよいし、また図3(d)に示すようにU字状の貫通孔56が形成されたもので構成されていてもよい。   The locking member 48 may be configured in a shape in which a curved portion is provided downward. The locking member 48 may have a shape in which a groove is formed to the extent that a later-described steel wire rod can be locked. Moreover, as shown in FIG.3 (c), it may be comprised by the shape only in which the groove | channel was formed, and the U-shaped through-hole 56 was formed as shown in FIG.3 (d). It may consist of things.

また、鋼製線材11をこの金具44に固定する際には、例えば図3(e)に示すように、金具44の貫通孔56にクサビ53を嵌合させ、このクサビ53の中心に鋼製線材11を挿通させるようにしてもよい。クサビ53は金具44の貫通孔56に嵌合されることにより、テーパ57の持つ角度勾配に伴って内側へ締め付け力が作用することになり、鋼製線材11を強固に固定することが可能となる。   Further, when the steel wire 11 is fixed to the metal fitting 44, for example, as shown in FIG. 3 (e), the wedge 53 is fitted into the through hole 56 of the metal fitting 44, and the steel 53 is made in the center of the wedge 53. The wire 11 may be inserted. When the wedge 53 is fitted into the through hole 56 of the metal fitting 44, a tightening force acts inward along with the angle gradient of the taper 57, and the steel wire 11 can be firmly fixed. Become.

また、この土留め壁部材4には、図3(a)に示すように下方に湾曲させて略U字形に鋼製線材11が取り付けられている。この鋼製線材11の両端部11bは、金具44における貫通孔に挿通されて固定されている。またこの鋼製線材11において湾曲させた湾曲部11aは、係止部材48に係止されている。   Further, as shown in FIG. 3 (a), a steel wire 11 is attached to the earth retaining wall member 4 in a substantially U shape by being bent downward. Both ends 11 b of the steel wire 11 are inserted and fixed in through holes in the metal fitting 44. Further, the bent portion 11 a bent in the steel wire 11 is locked to the locking member 48.

この鋼製線材11は、PC鋼材、棒鋼や平鋼で構成されていてもよい。ちなみに、この鋼製線材11には、緊張力が導入されている。この緊張力は、例えば鋼製線材11の両端に螺着された図示しない緊張装置により導入されていてもよい。即ち、この図示しないボルトの締め付け度合いにより、緊張力を増減させることが可能となる。また、この鋼製線材11の両端には、当該鋼製線材11を地上側へ引っ張り可能な図示しない緊張装置が設けられていてもよい。これにより、土留めの変位の状況に基づいて地上において自由に緊張力を増減することが可能となる。   This steel wire 11 may be made of PC steel, steel bar or flat steel. Incidentally, tension is introduced into the steel wire 11. This tension force may be introduced by, for example, a tension device (not shown) screwed to both ends of the steel wire 11. That is, the tension can be increased or decreased depending on the tightening degree of the bolt (not shown). Moreover, the tension apparatus which is not shown in figure which can pull the said steel wire 11 to the ground side may be provided in the both ends of this steel wire 11. This makes it possible to increase or decrease the tension force freely on the ground based on the state of displacement of the retaining ring.

図3(b)は、参考例として土留め壁の補強構造1の他の実施の形態を示している。この図3(b)の例においては、上述の如く鋼製線材11をU字状に設ける代わりに、2本の鋼製線材111を略直線状に取り付ける。このとき、鋼製線材111は、互いに離間させるとともに、それぞれ図芯から離れた位置においてそれぞれ偏心した状態で取り付けられている。この鋼製線材111は、上下に取り付けられた金具44を介してそれぞれ固定するようにしてもよい。この鋼製線材111も同様に緊張力が導入されていることになる。   FIG.3 (b) has shown other embodiment of the reinforcement structure 1 of the earth retaining wall as a reference example. In the example of FIG. 3B, instead of providing the steel wire 11 in a U shape as described above, two steel wires 111 are attached in a substantially linear shape. At this time, the steel wire rods 111 are attached to each other in a state of being eccentric from each other at positions away from the centroid while being separated from each other. You may make it fix this steel wire 111 through the metal fitting 44 attached up and down, respectively. This steel wire 111 is similarly introduced with tension.

このような土留め壁3は、鋼製線材11が設けられた土留め壁部材4の周囲において、さらにソイルセメントやコンクリート39があってもよい。   Such a retaining wall 3 may further include soil cement or concrete 39 around the retaining wall member 4 provided with the steel wire 11.

次に、本発明を適用した土留め壁の補強構造1の施工方法について説明をする。   Next, the construction method of the retaining wall reinforcing structure 1 to which the present invention is applied will be described.

先ず、土留め壁部材4におけるフランジ鋼板42aの背面側に、金具44、係止部材48を取り付ける。次に、鋼製線材11を金具44並びに係止部材48へ取り付けてこれを固定する。この段階において緊張力を負荷するようにしてもよい。   First, the metal fitting 44 and the locking member 48 are attached to the back surface side of the flange steel plate 42 a in the retaining wall member 4. Next, the steel wire 11 is attached to the metal fitting 44 and the locking member 48 and fixed thereto. At this stage, tension may be applied.

次に、この土留め壁部材4を地中に建て込む。土留め壁部材4を地中に建て込む方法としては、連続掘削機で土砂を掘削した後、クレーンで建て込んでコンクリートを打設してもよいし、いわゆるSMW工法のようにソイルセメントを造成した後、クレーンで建て込んでもよい。また、バイブロ工法や圧入工法を使用するようにしてもよい。最終的に建て込みを終了させた後、上述した図示しない緊張装置等を用いて緊張力を負荷し、また増減させるようにしてもよい。   Next, this earth retaining wall member 4 is built in the ground. As a method of building the earth retaining wall member 4 into the ground, after excavating the earth and sand with a continuous excavator, it may be built with a crane and cast concrete, or a soil cement may be formed as in the so-called SMW method. After that, it may be built with a crane. Further, a vibro method or a press-fitting method may be used. After the installation is finally finished, the tension force may be applied and increased or decreased using the tension device (not shown) described above.

このような方法により施工された土留め壁の補強構造1は、以下に説明するような作用を奏する。   The retaining wall reinforcing structure 1 constructed by such a method has the following effects.

先ず、土留め壁部材4は、鋼製線材11により緊張力が付与されている。しかも、この鋼製線材11は、フランジ鋼板42aに取り付けられているため、鋼製線材11に対して緊張力を導入することにより、図4(a)に示すように背面側へ向けて曲げ応力が負荷されることになる。その結果、土留め壁部材4は背面側へ向けて曲げ変形しようとすることになる。   First, the retaining wall member 4 is given tension by the steel wire 11. Moreover, since this steel wire 11 is attached to the flange steel plate 42a, by introducing tension to the steel wire 11, bending stress toward the back side as shown in FIG. 4 (a). Will be loaded. As a result, the earth retaining wall member 4 tends to bend and deform toward the back side.

一般に、土留め壁部材4の背面側に位置する地山5からは図5に示すように土水圧に基づく応力が作用することになり、特に土留め壁部材4の上端部の変位が大きくなってしまう。これは、土留め壁部材4の前面側において道路2を構成すべく掘削を行うことが原因である。しかし、本発明では、上述の如き土留め壁部材4の背面側に取り付けられた鋼製線材11による緊張力に基づき、当該土留め部材4に対して背面側へ向けて曲げ変形しようとする力を働かせているため、上記土水圧に基づく応力に対して対抗することができる。その結果、図4(b)における実線で示される図のように、土水圧に基づく土留め壁部材4の上端部の前面側への変位量を抑えることが可能となる。ちなみに、この図4(b)における点線で示される例は、鋼製線材11を配置しない場合における土留め壁部材4の変形状態を示している。   Generally, stress based on earth water pressure acts from the natural ground 5 located on the back side of the retaining wall member 4 as shown in FIG. 5, and in particular, the displacement of the upper end portion of the retaining wall member 4 becomes large. End up. This is because excavation is performed to form the road 2 on the front side of the retaining wall member 4. However, in the present invention, based on the tension force by the steel wire 11 attached to the back side of the earth retaining wall member 4 as described above, the force to bend and deform the earth retaining member 4 toward the back side. Therefore, it is possible to counter the stress based on the soil water pressure. As a result, as shown by the solid line in FIG. 4B, it is possible to suppress the amount of displacement of the upper end portion of the retaining wall member 4 based on the earth water pressure toward the front side. Incidentally, the example shown by the dotted line in FIG. 4B shows a deformed state of the retaining wall member 4 when the steel wire 11 is not arranged.

特に本発明では、参考例として鋼製線材11をU字状に配置し、また係止部材48に設けられた溝部にこれを引っ掛けて固定している。このため、滑車の原理により、鋼製線材11に対する1回の緊張力導入により、2倍の緊張力を得ることが可能となる。   Particularly in the present invention, the steel wire 11 is arranged in a U-shape as a reference example, and is hooked and fixed to a groove provided in the locking member 48. For this reason, according to the principle of a pulley, it becomes possible to obtain twice the tension force by introducing the tension force to the steel wire 11 once.

また、参考例として鋼製線材11を取り付けた後、実際に緊張力が不要となり、当該鋼製線材11を除去しなければならないケースが生じた場合においても、この鋼製線材11の端部を地上付近に位置させていることから、これを容易に引き上げることが可能となる。   Moreover, after attaching the steel wire 11 as a reference example, even when a tension force is actually unnecessary and the case where the steel wire 11 must be removed occurs, the end of the steel wire 11 is Since it is located near the ground, it can be easily lifted.

また、本発明では、土留め壁部材4の剛性を向上させる代わりに上述した鋼製線材11により土水圧に基づく上端部の変形を抑えることができるため、換言すれば土留め壁部材4の剛性を向上させる必要が無くなる。このため、土留め壁部材4の部材断面を大きくする必要も無くなり、工事費用を低減させることができ、施工期間の短縮化を図ることも可能となる。さらに、本発明では、土留め壁3を構築するために必要な用地を極力少なくすることが可能となる。   Moreover, in this invention, since the deformation | transformation of the upper end part based on earth water pressure can be suppressed by the steel wire 11 mentioned above instead of improving the rigidity of the earth retaining wall member 4, in other words, the rigidity of the earth retaining wall member 4 Need not be improved. For this reason, it is not necessary to enlarge the member cross section of the retaining wall member 4, the construction cost can be reduced, and the construction period can be shortened. Furthermore, according to the present invention, it is possible to reduce the site necessary for constructing the retaining wall 3 as much as possible.

ちなみに、上述した図3(b)に示すような形態においても同様に、鋼製線材111を介
して緊張力が導入されていることから、土水圧に基づく土留め壁部材4の上端部の前面側への変位量を抑えることが可能となる。
Incidentally, in the configuration as shown in FIG. 3 (b) described above, the tension force is also introduced through the steel wire 111, so that the upper end portion of the retaining wall member 4 based on the soil water pressure is applied. It is possible to suppress the amount of displacement toward the front side.

また、鋼製線材11は、上端部が掘削底面2aよりも上側に位置し、下端部が掘削底面よりも下側に位置している。この掘削底面2aとは、前面掘削2の地盤表面を意味している。これにより、土留め壁部材4の変形を効率的に小さくできる効果がある。
なお、本発明を適用した土留め壁の補強方法は、上述した実施の形態に限定されるものではない。
Moreover, as for the steel wire rod 11, an upper end part is located above the excavation bottom face 2a, and a lower end part is located below the excavation bottom face. The excavation bottom surface 2 a means the ground surface of the front excavation 2. Thereby, there exists an effect which can make small deformation of the earth retaining wall member 4 efficiently.
Note that the retaining wall reinforcement method to which the present invention is applied is not limited to the above-described embodiment.

図6(a)〜(c)は、本発明を適用した土留め壁の補強方法における他の適用例を示している。先ず図6(a)に示すように、上述した方法に基づいて構築した鋼製線材11が取り付けられた土留め壁3の前面側において構造物51を構築する。次に図6(b)に示すように、当該構造物51の上部を土砂で埋め戻す。この段階において土留め壁3は、前面側において埋め戻された土砂により支持されることになり、前面側へ撓もうとする力が小さくなる。このため、図6(c)に示すように土留め壁部材4から鋼製線材11を引き抜く。   6 (a) to 6 (c) show other application examples in the retaining wall reinforcement method to which the present invention is applied. First, as shown to Fig.6 (a), the structure 51 is constructed | assembled in the front side of the earth retaining wall 3 to which the steel wire 11 constructed | assembled based on the method mentioned above was attached. Next, as shown in FIG. 6B, the upper portion of the structure 51 is backfilled with earth and sand. At this stage, the earth retaining wall 3 is supported by the earth and sand buried back on the front side, and the force to bend toward the front side is reduced. For this reason, the steel wire 11 is pulled out from the earth retaining wall member 4 as shown in FIG.

図7は、管52内に鋼製線材11を挿入することにより、これを取り付ける形態を示している。管52は、例えば金属製やプラスチック等のシース等で適用されていてもよく、管52の内壁と鋼製線材11との間に間隙を設けた状態で配置される。鋼製線材を緊張したまま半永久に残置する場合は、この管52内に鋼製線材11を挿通させ、さらにその間隙においてセメントミルクを充填する。そして、このセメントミルクが固化されることにより、鋼製線材11を管52に対して強固に固定することが可能となる。ちなみに、このセメントミルクの充填は、鋼製線材11に対して緊張力を付与した後において実行することになる。ちなみに、この緊張力の付与はジャッキを介して行うようにしてもよい。   FIG. 7 shows a form in which the steel wire 11 is inserted into the pipe 52 and attached thereto. The tube 52 may be applied with a sheath made of metal or plastic, for example, and is disposed in a state where a gap is provided between the inner wall of the tube 52 and the steel wire 11. When the steel wire rod is left semi-permanently while being in tension, the steel wire rod 11 is inserted into the tube 52, and cement milk is filled in the gap. Then, the cement milk is solidified, so that the steel wire 11 can be firmly fixed to the pipe 52. Incidentally, the filling of the cement milk is executed after applying tension to the steel wire 11. Incidentally, this tension may be applied through a jack.

図8〜10は、鋼製線材11の配置方法における他の適用例を示している。図8(a)は、フランジ鋼板42aにおける内面に鋼製線材11を取り付ける例を示している。また、図8(b)は、フランジ鋼板42aにおける外面に鋼製線材11の上端を取り付け、フラン
ジ鋼板42aにおける内面に鋼製線材11の下端を取り付ける例を示している。
FIGS. 8-10 has shown the other application example in the arrangement | positioning method of the steel wire 11. FIG. Fig.8 (a) has shown the example which attaches the steel wire 11 to the inner surface in the flange steel plate 42a. FIG. 8B shows an example in which the upper end of the steel wire 11 is attached to the outer surface of the flange steel plate 42a and the lower end of the steel wire 11 is attached to the inner surface of the flange steel plate 42a.

また、図9(a)は、フランジ鋼板42aにおける外面に鋼製線材11の上端を取り付け、フランジ鋼板42bにおける内面に鋼製線材11の下端を取り付ける例を示している。図9(b)は、フランジ鋼板42bにおける外面に鋼製線材11の上端を取り付け、フラン
ジ鋼板42aにおける内面に鋼製線材11の下端を取り付ける例を示している。
Moreover, Fig.9 (a) has shown the example which attaches the upper end of the steel wire 11 to the outer surface in the flange steel plate 42a, and attaches the lower end of the steel wire 11 to the inner surface in the flange steel plate 42b. FIG.9 (b) has shown the example which attaches the upper end of the steel wire 11 to the outer surface in the flange steel plate 42b, and attaches the lower end of the steel wire 11 to the inner surface in the flange steel plate 42a.

図10(a)は、フランジ鋼板42aにおける外面に鋼製線材11の下端を固定し、鋼製
線材11の上端は、固定治具61を介してフランジ鋼板42b側へ突出させ、これを固定している。図10(b)は、固定治具61の位置を下方にシフトさせることにより、導入さ
れた緊張力に基づく曲げモーメント分布の調整を図ったものである。さらに図10(c)は
、フランジ鋼板42aにおける内面に鋼製線材11の下端を固定し、鋼製線材11の上端は、固定治具61を介してフランジ鋼板42b側へ突出させ、これを固定している。図10(d)は、フランジ鋼板42bにおける内面に鋼製線材11の下端を固定し、これを一度
フランジ鋼板42a側にある固定治具61に引っ掛けてから再度鋼製線材11の上端をフランジ鋼板42b側へ突出させ、これを固定している。
10A, the lower end of the steel wire 11 is fixed to the outer surface of the flange steel plate 42a, and the upper end of the steel wire 11 is protruded toward the flange steel plate 42b via the fixing jig 61 and fixed. ing. FIG. 10B is an adjustment of the bending moment distribution based on the introduced tension by shifting the position of the fixing jig 61 downward. Further, in FIG. 10 (c), the lower end of the steel wire 11 is fixed to the inner surface of the flange steel plate 42a, and the upper end of the steel wire 11 is protruded to the flange steel plate 42b side via the fixing jig 61 and fixed. is doing. FIG. 10 (d) shows that the lower end of the steel wire 11 is fixed to the inner surface of the flange steel plate 42b, and once hooked on the fixing jig 61 on the flange steel plate 42a side, the upper end of the steel wire 11 is again connected to the flange steel plate 42b. It protrudes to the 42b side and is fixed.

何れの実施の形態においても、鋼製線材11に緊張力を導入することにより、土留め壁部材4が背面側へ向けて曲げ変形しようとする力を作用させることができるため、本発明の所期の効果を得ることが可能となる。   In any of the embodiments, by introducing a tension force to the steel wire 11, the retaining wall member 4 can be subjected to a force to bend and deform toward the back side. The effect of the period can be obtained.

図11(a)は、前面側のフランジ鋼板42bの外面に鋼製線材11、111の上下端を配置した例である。また、図11(b)は、フランジ鋼板42bの内面に鋼製線材11、111の上下端を配置した例である。このように前面側に設けた鋼製線材11を緊張することにより、土留め部材4の中央部が前面に突き出てしまうのを防止することができる。   FIG. 11A shows an example in which the upper and lower ends of the steel wire rods 11 and 111 are arranged on the outer surface of the front side flange steel plate 42b. Moreover, FIG.11 (b) is the example which has arrange | positioned the steel wire rods 11 and 111 on the inner surface of the flange steel plate 42b. By tensioning the steel wire 11 provided on the front side in this way, it is possible to prevent the central portion of the earth retaining member 4 from protruding to the front.

本発明では、構成線材11等に負荷すべき緊張力を掘削側土砂の掘削深さに応じて段階的に高めるようにしてもよい。その理由として、前面掘削してから鋼製線材を1次締めし、更に前面掘削後、鋼製線材を2次締めすることにより、一度に全ての緊張力を導入することができ、効率的な変形抑制が可能となる。   In this invention, you may make it raise the tension | tensile_strength which should be loaded to the structural wire 11 etc. in steps according to the excavation depth of excavation side earth and sand. The reason for this is that the steel wire is first tightened after excavating the front surface, and then the steel wire is secondarily tightened after excavating the front surface. Deformation can be suppressed.

また、上端部の係止部材の土留め壁部材4深さ方向における固着位置が異なるように鋼製部材11を複数本設ける際に、上側に位置する鋼製線材11から下側に位置する鋼製線材11の順に、掘削側土砂の掘削深さに応じて段階的に緊張力を導入するようにしてもよい。その理由として、図12に示すように、前面掘削の各段階に応じて多段に配置した鋼製線材を緊張することにより、効率的な変形抑制が可能となる。図12(a)は、前面掘削が浅い状態を示している。かかる場合には、土留め壁部材4の上段から一段に亘って緊張力を導入するようにしている。図12(b)は、前面掘削がある程度進展した状態を示して いる。かかる場合には、土留め壁部材4の上段、中段の二段に亘って緊張力を導入するようにしている。図12(c)は、前面掘削がさらに深く進展した状態を示している。かかる場合には、土留め壁部材4の上段、中段、下段の三段に亘って緊張力を導入するようにしている。   Moreover, when providing the multiple steel members 11 so that the fixing position in the depth direction of the retaining wall member 4 of the retaining member of an upper end part may differ, the steel located below from the steel wire 11 located on the upper side You may make it introduce tension force in steps according to the excavation depth of excavation side earth and sand in order of the wire-making material 11. FIG. As a reason for this, as shown in FIG. 12, it is possible to efficiently suppress deformation by tensioning steel wires arranged in multiple stages in accordance with each stage of front excavation. FIG. 12 (a) shows a state where the front excavation is shallow. In such a case, the tension force is introduced from the upper stage to the upper stage of the earth retaining wall member 4. Fig. 12 (b) shows a state where front excavation has progressed to some extent. In such a case, the tension force is introduced over the upper and middle stages of the retaining wall member 4. FIG. 12 (c) shows a state in which the front excavation has further progressed. In such a case, the tension force is introduced over the upper, middle, and lower stages of the retaining wall member 4.

なお、この図12における実際の鋼製線材11の止着方法は、図9(b)に基づくものであるが、これに限定されるものではなく、上述した他のいかなる止着方法を採用するものであってもよい。   The actual method for fastening the steel wire 11 in FIG. 12 is based on FIG. 9B, but is not limited to this, and any other fastening method described above is employed. It may be a thing.

なお、鋼製線材11を、土留め壁部材4の背面側のみに設けると、図13(a)に示すよ
うに、中央部が前面側に大きく凸状に突き出てしまう。特に土留め壁部材4の高さが高いほど、この傾向が顕著に現れることになる。このため、図13(b)に示すように、前面側
において金具61、係止部材62を設け、上述と同様の手法に基づいて鋼製線材12を緊張力を持たせて配置する。このとき金具61、係止部材62の配置間隔は、金具44、係止部材48の間隔よりも狭く設定し、これに配設すべき鋼製線材12の長さも背面側のそれよりも短く設定することになる。
If the steel wire 11 is provided only on the back side of the retaining wall member 4, as shown in FIG. 13 (a), the central portion protrudes greatly in a convex shape on the front side. In particular, this tendency appears more prominently as the height of the retaining wall member 4 is higher. For this reason, as shown in FIG. 13 (b), a metal fitting 61 and a locking member 62 are provided on the front side, and the steel wire 12 is placed with tension based on the same method as described above. At this time, the arrangement interval of the metal fitting 61 and the locking member 62 is set to be narrower than the interval between the metal fitting 44 and the locking member 48, and the length of the steel wire 12 to be arranged on this is also set shorter than that on the back side. Will do.

このように前面側に設けた鋼製線材12を緊張することにより、図13(b)に示すよう
に中央部が前面に突き出てしまうのを防止することができる。
By tensioning the steel wire 12 provided on the front side in this way, it is possible to prevent the central portion from protruding to the front as shown in FIG. 13 (b).

このように、本発明では、土留め壁部材4の安定を保持する目的で架設する支保工やグラウンドアンカー等を適用しない自立式の土留め壁構造としている。即ち、本発明では、根入れ長を十分に確保し、背面側からの土水圧荷重に対して掘削底面下の地盤の反力で抵抗させ、土留め壁の安定を確保する構造形式である。   Thus, in this invention, it is set as the self-supporting earth retaining wall structure which does not apply the support work constructed | assembled in order to maintain the stability of the earth retaining wall member 4, a ground anchor, etc. That is, in the present invention, the structure is a structure that secures a sufficient depth of penetration, resists the soil pressure load from the back side by the reaction force of the ground below the bottom of the excavation, and ensures the stability of the retaining wall.

即ち、本発明を適用した、自立式の土留め壁構造は、図14(a)の曲げモーメント分布図に示すように、堀削底面付近よりも下側の土留め壁部材4に大きな曲げモーメントが発生しえるものであり、これに伴い図14(b)の変形分布図に示すように、土留め壁部材4の掘削側への変位が増大しえるものであっても、これを抑制するための土留め壁部材4を背面側へ曲げ変形させようとする緊張力を付与するものである。即ち、緊張力を掘削底面よりも下側から掘削底面よりも上側に亘る範囲において導入することにより、図14(c)の曲げモーメント分布図に示すように、曲げモーメントを分散させる効果を発揮させることができ、これに伴って図14(d)の変形分布図に示すように、土留め壁部材4の掘削側への変位を抑制することが可能となる。   That is, the self-supporting retaining wall structure to which the present invention is applied has a large bending moment at the retaining wall member 4 below the bottom of the excavation as shown in the bending moment distribution diagram of FIG. Accordingly, as shown in the deformation distribution diagram of FIG. 14 (b), even if the displacement of the retaining wall member 4 to the excavation side can be increased, this is suppressed. Therefore, a tension force is applied to bend and deform the earth retaining wall member 4 to the back side. That is, by introducing the tension force in a range from the lower side of the excavation bottom to the upper side of the excavation bottom, the effect of dispersing the bending moment is exhibited as shown in the bending moment distribution diagram of FIG. Accordingly, as shown in the deformation distribution diagram of FIG. 14D, it is possible to suppress the displacement of the retaining wall member 4 toward the excavation side.

1 土留め壁の補強構造
2 道路
3 土留め壁
4 土留め壁部材
5 地山
11 鋼製線材
41 ウェブ鋼板
42 フランジ鋼板
46 継ぎ手
44 金具
48 係止部材
DESCRIPTION OF SYMBOLS 1 Reinforcement structure of retaining wall 2 Road 3 Earth retaining wall 4 Earth retaining wall member 5 Ground 11 Steel wire material 41 Web steel plate 42 Flange steel plate 46 Joint 44 Metal fitting 48 Locking member

Claims (6)

土留め壁部材の断面図芯より地山側に偏芯して上記土留め壁部材の略軸方向に沿った略直線状に管の内壁と間隙を設けた状態で挿入された鋼製線材が取り付けられた土留め壁部材を地盤中に建て込み、
上記土留め壁部材が土水圧を受けて掘削側に曲げ変形しようとするものに抗して地山側に曲げ変形しようとする力が作用するように上記鋼製線材に緊張力を導入し、
上記鋼製線材を挿入した管内に、セメントミルクを充填、固化すること
を特徴とする土留め壁の補強方法。
A steel wire inserted with a gap between the inner wall of the pipe and a gap in a substantially straight line along the substantially axial direction of the earth retaining wall member attached to the ground mountain side from the cross-sectional core of the earth retaining wall member is attached. Built the retaining wall member in the ground,
Introducing tension to the steel wire so that the earth retaining wall member is subjected to earth water pressure and acts to bend and deform on the excavation side against a force that tries to bend and deform on the ground.
A method for reinforcing a retaining wall, wherein cement steel is filled and solidified in a pipe into which the steel wire is inserted.
ウェブ鋼板の両端にフランジ鋼板が設けられた断面H形状の鋼材である土留め壁部材の地山側のフランジ鋼板における外面に鋼製線材の上端を取り付けるとともに、当該フランジ鋼板における内面に上記鋼製線材の下端を取り付け、
上記土留め壁部材を建て込み、
上記土留め壁部材が土水圧を受けて掘削側に曲げ変形しようとするものに抗して地山側に曲げ変形しようとする力が作用するように上記鋼製線材に緊張力を導入すること
を特徴とする土留め壁の補強方法。
The upper end of the steel wire rod is attached to the outer surface of the flange steel plate on the ground wall side of the retaining wall member, which is a steel material having a H-shaped cross section provided with flange steel plates at both ends of the web steel plate, and the steel wire rod is attached to the inner surface of the flange steel plate. Attach the bottom edge of
The above earth retaining wall member is installed,
Tension force is introduced into the steel wire rod so that the earth retaining wall member is subjected to earth water pressure and acts to bend and deform to the excavation side against the earth and the ground. A method of reinforcing the retaining wall as a feature.
土留め壁部材の断面図芯より地山側に偏芯して上記土留め壁部材の略軸方向に沿って略直線状に構成した鋼製線材を、その上端部の係止部材の上記土留め壁部材深さ方向における固着位置が異なるように複数本設ける際に、上側に位置する鋼製線材から下側に位置する鋼製線材の順に、掘削側土砂の掘削深さに応じて段階的に緊張力を導入すること
を特徴とする土留め壁の補強方法。
A steel wire rod that is eccentric from the cross-sectional view core of the earth retaining wall member to the natural ground side and is configured substantially linearly along the substantially axial direction of the earth retaining wall member, the earth retaining of the locking member at the upper end portion thereof. When providing multiple wires so that the fixing positions in the wall member depth direction are different, stepwise according to the excavation depth of the excavation-side earth and sand in order from the steel wire rod located on the upper side to the steel wire rod located on the lower side A method for reinforcing a retaining wall, characterized by introducing tension.
地盤中に建て込まれた土留め壁部材において、
上記土留め壁部材の断面図芯より地山側に偏芯して上記土留め壁部材の略軸方向に沿って略直線状に鋼製線材が取り付けられ、
上記鋼製線材は、管の内壁と間隙を設けた状態で挿入されるとともに、上記土留め壁部材が土水圧を受けて掘削側に曲げ変形しようとするものに抗して地山側に曲げ変形しようとする力が作用するように緊張力が導入され、
上記鋼製線材が挿入された管内は、セメントミルクにより充填、固化されること
を特徴とする土留め壁の補強構造。
In the retaining wall member built in the ground,
A steel wire is attached in a substantially straight line along the substantially axial direction of the earth retaining wall member eccentric from the cross-sectional view core of the earth retaining wall member to the natural ground side.
The steel wire is inserted in a state where a gap is provided between the inner wall of the pipe, and the earth retaining wall member is bent and deformed to the natural ground side against the one that is subjected to bending deformation to the excavation side due to earth pressure. Tension is introduced so that the power to try is applied,
A structure for reinforcing a retaining wall, wherein the pipe into which the steel wire is inserted is filled and solidified with cement milk.
地盤中に建て込まれた土留め壁部材において、
上記土留め壁部材はウェブ鋼板の両端にフランジ鋼板が設けられた断面H形状の鋼材であり、
上記土留め壁部材の地山側のフランジ鋼板における外面に鋼製線材の上端が取り付けられるとともに、当該フランジ鋼板における内面に上記鋼製線材の下端が取り付けられ、
上記土留め壁部材が土水圧を受けて掘削側に曲げ変形しようとするものに抗して地山側に曲げ変形しようとする力が作用するように上記鋼製線材に緊張力が導入されていること
を特徴とする土留め壁の補強構造。
In the retaining wall member built in the ground,
The retaining wall member is a steel material having a cross-sectional H shape in which flange steel plates are provided at both ends of the web steel plate,
The upper end of the steel wire rod is attached to the outer surface of the flange steel plate on the natural ground side of the retaining wall member, and the lower end of the steel wire rod is attached to the inner surface of the flange steel plate,
Tensile force is introduced into the steel wire so that the earth retaining wall member is subjected to earth and water pressure and acts to bend and deform on the excavation side against the earth and the ground. A retaining wall reinforcement structure characterized by this.
地盤中に建て込まれた土留め壁部材において、
上記土留め壁部材の断面図芯より地山側に偏芯して上記土留め壁部材の略軸方向に沿って略直線状を構成する鋼製線材が、その上端部の係止部材の上記土留め壁部材深さ方向の固着位置が異なるように複数本取り付けられ、
上側に位置する鋼製線材から下側に位置する鋼製線材の順に、掘削側土砂の掘削深さに応じて段階的に緊張力が導入されていること
を特徴とする土留め壁の補強構造。
In the retaining wall member built in the ground,
A steel wire rod that is eccentric from the cross-sectional view core of the earth retaining wall member to the natural ground side and forms a substantially straight shape along the substantially axial direction of the earth retaining wall member is the earth of the locking member at the upper end portion thereof. A plurality of fixing wall members are attached so that the fixing positions in the depth direction are different,
Reinforcement structure for retaining wall, wherein tension is introduced stepwise according to the excavation depth of the excavation-side earth and sand in the order of the steel wire located on the upper side to the steel wire located on the lower side .
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CN108277798A (en) * 2018-04-08 2018-07-13 江苏地基工程有限公司 Prestressing force shaped steel support pile and its construction method
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