JP5163246B2 - Underground continuous wall and its construction method - Google Patents

Underground continuous wall and its construction method Download PDF

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JP5163246B2
JP5163246B2 JP2008100978A JP2008100978A JP5163246B2 JP 5163246 B2 JP5163246 B2 JP 5163246B2 JP 2008100978 A JP2008100978 A JP 2008100978A JP 2008100978 A JP2008100978 A JP 2008100978A JP 5163246 B2 JP5163246 B2 JP 5163246B2
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sheet pile
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俊彦 坂本
健二 西海
裕章 中山
真治 妙中
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Nippon Steel Corp
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本発明は、土木建築工事で主に土砂などの崩落を防ぐ土留め壁や地下構造物の壁、河川や港湾の護岸壁、道路工事などの擁壁に用いられる地中連続壁及びその構築方法に関するものである。   The present invention relates to a retaining wall for underground construction, a wall for underground structures, a revetment wall for rivers and harbors, a retaining wall for road construction, etc., and a construction method thereof. It is about.

建築土木分野において、主に土砂などの崩落を防ぐ土留め壁や河川の護岸壁などに用いられる地中連続壁用鋼材として一般に鋼矢板が使用される。その一例としてU形、Z形、直線形、ハット形などがあり、土木建築工事に際しては、その継手どうしを嵌合させながら打設することで一体の地中連続壁とする。ここで、壁体の耐力を高める方法として、鋼矢板単体の断面性能を高める所謂サイズアップや、U形鋼矢板2枚を継手部合わせて溶接加工にて一体化し筒状を成した組み合わせ鋼矢板や、直線鋼矢板、U形、Z形、直線形、ハット形鋼矢板にH形鋼やCT鋼を溶接接合した加工鋼矢板などがある。   In the field of construction and civil engineering, steel sheet piles are generally used as steel materials for underground continuous walls used mainly for retaining walls that prevent collapse of earth and sand and riverwalls. For example, there are U shape, Z shape, straight line shape, hat shape, etc., and in civil engineering construction work, it is made into an integrated underground continuous wall by placing the joints together. Here, as a method for increasing the proof stress of the wall body, a so-called upsizing that increases the cross-sectional performance of a steel sheet pile alone, or a combined steel sheet pile that is formed by joining two U-shaped steel sheet piles together by welding and forming a tubular shape. And straight steel sheet piles, U-shaped, Z-shaped, straight-line, hat-shaped steel sheet piles, and H-shaped steel and CT steel sheet steel.

加工鋼矢板の従来技術としては、例えば特許文献1には、直線鋼矢板の幅方向中央部にCT形鋼のウェブ部先端を溶接し、前記CT形鋼のフランジ部にプレキャストコンクリート版を挿入した高剛性鋼矢板が開示されている。   As a prior art of a processed steel sheet pile, for example, in Patent Document 1, a web portion tip of a CT section steel is welded to a central portion in the width direction of a straight steel sheet pile, and a precast concrete plate is inserted into a flange portion of the CT section steel. A highly rigid steel sheet pile is disclosed.

特許文献2では、左右の継手形状が非対称な略U形鋼矢板のウェブ面内にT形鋼のウェブ部を溶接した地中連続壁用鋼製部材が開示されている。   In patent document 2, the steel member for underground continuous walls which welded the web part of the T-shaped steel in the web surface of the substantially U-shaped steel sheet pile with which the joint shape of right and left is asymmetrical is disclosed.

さらに、鋼矢板にH形鋼を溶接接合した地中連続壁に関する発明がいくつか開示されている。例えば特許文献3では、左右の継手形状が非対称の直線鋼矢板とH形鋼とを溶接接合した壁形鋼矢板とその製造方法が開示されている。この特許文献3に記載の発明では、直線鋼矢板のウェブ部の裏面側に凹部を設けてH形鋼のフランジを配置し、この凹部の底面に形成した突条にH形鋼のフランジ外面を接させ、H形鋼フランジの両端部を開先溶接し、前記突条により直線鋼矢板のウェブ部と溶接部とを離すことで直線鋼矢板ウェブ部が溶接熱により変形することを防止している。   Further, several inventions relating to underground continuous walls in which H-shaped steel is welded to steel sheet piles are disclosed. For example, Patent Document 3 discloses a wall-shaped steel sheet pile obtained by welding and joining a straight steel sheet pile with an asymmetric left and right joint shape and an H-shaped steel, and a manufacturing method thereof. In the invention described in Patent Document 3, a concave portion is provided on the back surface side of the web portion of the straight steel sheet pile, and an H-shaped steel flange is disposed, and the flange outer surface of the H-shaped steel is formed on the protrusion formed on the bottom surface of the concave portion. The two ends of the H-shaped steel flange are welded to each other, and the straight steel sheet pile web portion is prevented from being deformed by welding heat by separating the web portion and the welded portion of the straight steel sheet pile by the protrusions. Yes.

特許文献4では、特許文献2におけるT形鋼の加工手間や製作上の問題を解決した発明として、左右の継手形状が非対称の略U字形状の鋼矢板にH形鋼を溶接あるいはボルト接合した地中連続壁用鋼材が開示されている。また特許文献4、5には、打設前に鋼矢板とH形鋼を溶接、一体化する技術が開示されている。   In patent document 4, as an invention which solved the problem in processing and manufacturing of T-shaped steel in patent document 2, H-shaped steel was welded or bolted to a substantially U-shaped steel sheet pile with asymmetrical left and right joint shapes. A steel material for underground continuous walls is disclosed. Patent Documents 4 and 5 disclose techniques for welding and integrating a steel sheet pile and an H-shaped steel before placing.

特許文献6では、前記特許文献4の地中連続壁用鋼材における鋼矢板とH形鋼を溶接加工する際に生じる溶接後の熱ひずみによって鋼矢板が幅方向に変形しやすいという問題点を解決するため、H形鋼フランジ部両端の溶接を左右同時に実施し、あるいは溶接時の温度を管理し断面内左右2箇所の熱ひずみを均等化するという製造方法の発明が開示されている。
特許第2680383号公報 特開平6−280251号公報 特開平11−140864号公報 特開2002−212943号公報 特開昭62−133209号公報 特開2005−127033号公報 特開2006−241816号公報
Patent Document 6 solves the problem that the steel sheet pile easily deforms in the width direction due to the thermal strain after welding that occurs when welding the steel sheet pile and the H-shaped steel in the steel for continuous underground wall of Patent Document 4 described above. Therefore, an invention of a manufacturing method is disclosed in which welding at both ends of the H-shaped steel flange portion is performed simultaneously on the left and right, or the temperature at the time of welding is controlled to equalize the thermal strain at the two left and right positions in the cross section.
Japanese Patent No. 2680383 JP-A-6-280251 JP-A-11-140864 JP 2002-212943 A JP 62-133209 A JP 2005-127033 A JP 2006-241816 A

上記特許文献1、特許文献2、特許文献4、及び特許文献5は、鋼矢板壁の耐力を高める方法としてCT形鋼、T形鋼、H形鋼などの形鋼部材との異なる組み合わせを提案しているが、主に鋼矢板と形鋼部材の接合は溶接接合によるものである。この鋼矢板と形鋼部材の溶接接合では、両者の溶接は接合部全長に亘って行われるのが通常である。ところが、上記、特許文献3および5で指摘されているように、溶接による接合では、溶接後の熱ひずみにより鋼矢板が幅方向あるいは長手方向に大きく変形するという問題がある。   Patent Document 1, Patent Document 2, Patent Document 4, and Patent Document 5 propose different combinations with structural steel members such as CT section steel, T section steel, and H section steel as methods for increasing the strength of steel sheet pile walls. However, the joining of the steel sheet pile and the shaped steel member is mainly by welding joining. In the welding joining of the steel sheet pile and the shaped steel member, the welding is usually performed over the entire length of the joining portion. However, as pointed out in Patent Documents 3 and 5 above, in joining by welding, there is a problem that the steel sheet pile is greatly deformed in the width direction or the longitudinal direction due to thermal strain after welding.

ここで、溶接が接合部全長に亘って行われるのは、地中連続壁の断面性能を確保するためと考えられる。例えば、特許文献7では、特許文献4に記載される発明に相当する実施例が記載されている。それによると、鋼矢板としてSM−Jパイル、H形鋼としてH588×300×12×20を用いて鋼矢板ウェブ部とH形鋼フランジ部を隅肉溶接またはフレア溶接して両者を一体化させたものである。この地中連続壁用鋼材を用いて地中連続壁を構築した場合、壁体の断面性能は8720cm/mとなることが記載されている。 Here, the reason why the welding is performed over the entire length of the joint is considered to ensure the cross-sectional performance of the underground continuous wall. For example, Patent Document 7 describes an embodiment corresponding to the invention described in Patent Document 4. According to it, steel sheet pile web part and H-shaped steel flange part are fillet welded or flare welded using SM-J pile as steel sheet pile and H588 × 300 × 12 × 20 as H-section steel to integrate both. It is a thing. It is described that when the underground continuous wall is constructed using the steel material for underground continuous wall, the cross-sectional performance of the wall body becomes 8720 cm 3 / m.

ここで、断面性能の考え方は以下の式を満足する必要がある。

Figure 0005163246
Here, the concept of the cross-sectional performance needs to satisfy the following formula.
Figure 0005163246

表1に上式中の記号の意味を示す。上式が成立するためには、図15に示す鋼矢板103のウェブ部103aとH形鋼102のフランジ部102aが溶接部104の位置で溶接され、両者が一体化されていることが前提であり、このとき地中連続壁用鋼材101の中立軸はGとなる。 Table 1 shows the meanings of the symbols in the above formula. In order for the above equation to be established, it is assumed that the web portion 103a of the steel sheet pile 103 and the flange portion 102a of the H-section steel 102 shown in FIG. 15 are welded at the position of the welded portion 104, and both are integrated. At this time, the neutral axis of the steel material 101 for the underground continuous wall is G.

Figure 0005163246
Figure 0005163246

以上から、特許文献4および特許文献7に記載の発明が成立するためには、溶接部が図16(a)に示すように鋼矢板103とH形鋼102の全長にわたって行われていること、又は図16(b)に示すように1mあたり数十%の溶接部104が全長にわたって行われている必要があることが判る。仮に溶接が全長にわたって行われていなければ、特許文献4および特許文献7に示される断面性能を発揮することはできない。   From the above, in order for the inventions described in Patent Document 4 and Patent Document 7 to be established, the welded portion is performed over the entire length of the steel sheet pile 103 and the H-section steel 102 as shown in FIG. 16 (a). Alternatively, as shown in FIG. 16 (b), it can be seen that several tens of% of the welded portion 104 per meter must be formed over the entire length. If welding is not performed over the entire length, the cross-sectional performance shown in Patent Document 4 and Patent Document 7 cannot be exhibited.

また、溶接が原因の熱ひずみによる鋼矢板の変形は、両側に位置する継手の長手方向の直線性に大きく影響を与えて、この直線性が保持できなくなる。鋼矢板に代表される地中連続用鋼材は、互いの継手を嵌合させて打設するため、地中連続壁用の継手の直線性が保持できない場合、嵌合時における継手部の摩擦が増大して打設性を損ねることとなり、溶接接合後にガスあぶりやプレス矯正などによって変形を矯正する必要が生じる。   Further, the deformation of the steel sheet pile due to thermal strain caused by welding greatly affects the linearity in the longitudinal direction of the joints located on both sides, and this linearity cannot be maintained. Steel for underground use represented by steel sheet piles is driven by fitting each other's joints, so if the linearity of the joint for underground continuous walls cannot be maintained, the friction of the joint during fitting will be reduced. It increases and impairs the casting property, and it becomes necessary to correct the deformation by gas blow or press correction after welding joining.

特許文献3では、左右の継手形状が非対称の特殊な断面形状の直線鋼矢板を用いることで直線鋼矢板のウェブ部と溶接部を離すことを可能とし、直線鋼矢板のウェブ部が溶接熱により変形するのを防止しているが、専用の孔型圧延機やユニバーサル圧延機等を用いて特殊直線鋼矢板を製造する必要があり、コスト面での課題がある。   In Patent Document 3, it is possible to separate the web portion of the straight steel sheet pile from the welded portion by using a straight steel sheet pile having a special cross-sectional shape in which the left and right joint shapes are asymmetric. Although deformation is prevented, it is necessary to manufacture a special straight steel sheet pile using a dedicated hole rolling mill, a universal rolling mill or the like, and there is a problem in terms of cost.

特許文献4では、鋼矢板とH形鋼の接続方法において、溶接だけではなくボルトによる方法でもよいと記述されており、ボルト接合を採用した場合、鋼矢板とH形鋼を個別に搬送し、現地にて組立てることが可能となる。また、溶接加工によって生じる鋼矢板の矯正作業を行う必要は無い。しかし、鋼矢板とH形鋼は全長にわたって接合しなければならず、ボルト孔の加工、組立て作業、軸力管理など非常に煩雑な作業が生じることから溶接による接合方法と比較しても利便性が大きく向上するわけではない。   In patent document 4, in the connection method of a steel sheet pile and H-section steel, it is described that not only welding but the method by a bolt may be used, When a bolt joining is employ | adopted, a steel sheet pile and H-section steel are conveyed separately, It can be assembled locally. Moreover, it is not necessary to correct the steel sheet pile produced by welding. However, steel sheet piles and H-shaped steel must be joined over their entire length, which is very complicated compared to welding methods because welding is very complicated, such as bolt hole processing, assembly work, and axial force management. Is not a big improvement.

特許文献6では、特許文献4に記載の地中連続壁用鋼材を製作する際に生じる熱ひずみを抑えるため、H形鋼両端フランジ部の溶接を左右同時に実施し、あるいは、フランジ部両端のうち一方の溶接の溶接完了後における溶接部の温度が200℃以上の範囲で他方の溶接を開始し、断面内左右2箇所の熱ひずみを均等化するという製造方法が記載されている。上記方法にて熱ひずみを抑制するためには徹底した製造管理が必要となり、場合によっては大掛かりな設備導入を行う必要がある。たとえ、熱ひずみを抑制した加工を行うことができたとしても、それを確認するための煩雑な形状測定をオフラインにて行う必要がある。   In patent document 6, in order to suppress the thermal distortion which arises when manufacturing the steel material for underground underground walls described in patent document 4, welding of the H-section steel both-ends flange part is implemented simultaneously on either side, or A manufacturing method is described in which the welding of one weld is started in the range of 200 ° C. or more after completion of welding of one welding, and the thermal strains at the two left and right positions in the cross section are equalized. In order to suppress thermal strain by the above method, thorough manufacturing management is required, and in some cases, it is necessary to introduce large-scale equipment. Even if it is possible to perform processing with suppressed thermal distortion, it is necessary to perform complicated shape measurement for confirming it offline.

以上より、鋼矢板壁の耐力を高めるためにCT形鋼、T形鋼、H形鋼などの形鋼部材を組み合わせた構造は、溶接加工、形状測定、ひずみの矯正作業、その他煩雑な作業により必ずしも経済的な構造であるとはいい難い。また、これらの製造方法は徹底した管理の下で行われることが必須条件であり、工場などで加工した後、施工現場に搬送することとなる。鋼矢板やH形鋼は、その横断面形状から搬送時に積み重ねが可能であるが、特許文献4、5の発明による地中連続壁用鋼材では鋼矢板とH形鋼を溶接加工しているため、複雑な横断面形状となり運搬の際に非常に非効率であり、運搬した後の工事現場での保管にも広大なスペースが必要となってくる。   From the above, the structure that combines shape steel members such as CT shape steel, T shape steel, H shape steel in order to increase the strength of the steel sheet pile wall can be done by welding, shape measurement, distortion correction work, and other complicated work. It is not necessarily an economic structure. In addition, these manufacturing methods are required to be performed under thorough management, and after processing at a factory or the like, they are transported to a construction site. Steel sheet piles and H-section steel can be stacked from the cross-sectional shape at the time of transportation, but steel sheet piles and H-section steel are welded in the steel materials for underground continuous walls according to the inventions of Patent Documents 4 and 5. It has a complicated cross-sectional shape, is very inefficient during transportation, and requires a large space for storage at the construction site after transportation.

上記の従来技術を踏まえ、本発明においては鋼矢板のみに比べてはるかに剛性が大きく、溶接接合のような溶接部の温度管理、長手方向の全長に亘るボルト接合のような煩雑な作業が不要であり、かつ運搬・保管効率に優れた地中連続壁及びその構築方法を提供することを目的とする。   Based on the above prior art, in the present invention, the rigidity is much higher than that of a steel sheet pile alone, and there is no need for troublesome work such as temperature control of the welded part such as welded joints and bolted joining over the entire length in the longitudinal direction. An object of the present invention is to provide an underground continuous wall that is excellent in transportation and storage efficiency and a construction method thereof.

本発明者は、上述した課題を解決するために、鋼矢板と、H形鋼とからなる地中連続壁において、隣接する鋼矢板間を連結するための継手部と、H形鋼のフランジ部とが長手方向に沿って、互いに接触して重ならせ、その重なっている部分の長手方向の両端のうち、一端のみを拘束させた地中連続壁を発明した。   In order to solve the above-mentioned problems, the present inventor, in the underground continuous wall made of steel sheet piles and H-section steel, a joint portion for connecting adjacent steel sheet piles, and a flange portion of the H-section steel Invented the underground continuous wall in which the two are in contact with each other along the longitudinal direction, and only one end is constrained at both ends in the longitudinal direction of the overlapping portion.

即ち、本願請求項1に記載の地中連続壁は、幅方向の中央部にウェブ部を有し且つ両端部に継手を有する鋼矢板と、ウェブ部の端部にフランジ部を有する断面H形状又は断面T形状の鋼材とからなる地中連続壁において、隣接する鋼矢板間を連結するための前記継手を含む継手部と、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部とが長手方向に沿って、互いに接触して重なっていると共に、前記重なっている部分の長手方向の両端のうち、一端のみが拘束され、前記継手は、前記フランジ部に向けて突設され、前記継手と周接可能な曲面が形成されたガイドが、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部に長手方向にわたって連続的もしくは断続的に固着されてなることを特徴とする。 That is, the underground continuous wall according to claim 1 is a steel sheet pile having a web portion at the center in the width direction and joints at both ends, and a cross-sectional H shape having a flange portion at the end of the web portion. Or, in the underground continuous wall made of steel material having a T-shaped cross section, a joint portion including the joint for connecting adjacent steel sheet piles, and one flange portion in the steel material having the H-shaped cross section or the T-shaped cross section The flange portion of the steel material is overlapped in contact with each other along the longitudinal direction, and only one end of the overlapping portion in the longitudinal direction is constrained, and the joint is directed toward the flange portion. The guide provided with a curved surface that protrudes and can be circumferentially contacted with the joint is continuous over the longitudinal direction on one flange portion in the steel material having the H-shaped cross section or the flange portion in the steel material having the T-shaped cross section. Characterized by comprising a connection to anchoring.

本願請求項2に記載の地中連続壁は、請求項1に記載の発明において、鋼矢板は、Z形鋼矢板、ハット形鋼矢板又は直線鋼矢板であることを特徴とする。   The underground continuous wall according to claim 2 of the present application is characterized in that, in the invention according to claim 1, the steel sheet pile is a Z-shaped steel sheet pile, a hat-shaped steel sheet pile, or a straight steel sheet pile.

本願請求項3に記載の地中連続壁は、請求項1又は2に記載の発明において、前記断面H形状の鋼材は、H形鋼であり、前記断面T形状の鋼材は、T形鋼であることを特徴とする。   The underground continuous wall according to claim 3 of the present application is the invention according to claim 1 or 2, wherein the steel material having the H-shaped section is H-shaped steel, and the steel material having the T-shaped cross section is T-shaped steel. It is characterized by being.

本願請求項4に記載の地中連続壁は、請求項1〜3の何れか1項に記載の発明において、前記一端の拘束は、コーピング、ボルト、ドリルねじ、溶接の何れかまたはこれら2つ以上を組み合わせたものによるものであることを特徴とする。   The underground continuous wall according to claim 4 of the present application is the invention according to any one of claims 1 to 3, wherein the constraint at the one end is any one of coping, bolt, drill screw, welding, or two of these. It is characterized by a combination of the above.

本願請求項5に記載の地中連続壁は、請求項1〜4の何れか1項に記載の発明において、前記一端が拘束されるとき、前記継手部と、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部との間に介装材が介装されてなることを特徴とする。 The underground continuous wall according to claim 5 of the present application is the invention according to any one of claims 1 to 4, wherein when the one end is constrained, the joint portion and the steel material having the H-shaped cross section. An interposing material is interposed between the flange portion of the steel plate or the flange portion of the steel material having the T-shaped cross section .

本願請求項6に記載の地中連続壁の構築方法は、請求項1〜5の何れか1項に記載の地中連続壁の構築方法において、複数の前記鋼矢板同士を、前記継手を介して嵌合して地盤内に打設することで前記鋼矢板による壁体を構築した後、前記継手を含む継手部に対して、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部を長手方向に沿って、互いに接触して重なるように打設し、前記重なっている部分の長手方向の両端のうち、地上側の一端のみを拘束し、曲面が形成されたガイドを前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部の長手方向に予め配設し、前記鋼矢板の継手に前記ガイドの曲面を沿わせつつ前記鋼材を打設することを特徴とする。 The underground continuous wall construction method according to claim 6 of the present application is the underground continuous wall construction method according to any one of claims 1 to 5, wherein a plurality of the steel sheet piles are connected to each other via the joint. The wall made of the steel sheet pile is constructed by fitting and placing in the ground, and then one flange part in the steel material having the H-shaped section or the T-shaped section in the steel part with respect to the joint part including the joint. In the steel material, the flange portion was placed so as to be in contact with each other and overlapped along the longitudinal direction, and only one end on the ground side was constrained among the longitudinal ends of the overlapping portion, and a curved surface was formed. A guide is disposed in advance in the longitudinal direction of one flange portion of the steel material having the H-shaped cross section or the flange portion of the steel material having the T-shaped cross section, and the steel material is hit while keeping the curved surface of the guide along the joint of the steel sheet pile. and wherein the set to Rukoto.

本願請求項7に記載の地中連続壁の構築方法は、請求項1〜の何れか1項に記載の地中連続壁の構築方法において、既設で両端部に継手を有する鋼矢板で構築された地中連続壁を用い、前記継手を含む継手部に対して、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部を長手方向に沿って、互いに接触して重なるように打設し、前記重なっている部分の長手方向の両端のうち、地上側の一端のみを拘束することを特徴とする。 The construction method of the underground continuous wall according to claim 7 of the present application is the construction method of the underground continuous wall according to any one of claims 1 to 5 , wherein the construction is made of an existing steel sheet pile having joints at both ends. One flange portion in the steel material having the H-shaped section or the flange portion in the steel material having the T-shaped cross section is brought into contact with each other along the longitudinal direction with respect to the joint portion including the joint. It is characterized in that only one end on the ground side is constrained among both ends in the longitudinal direction of the overlapping portion.

本願請求項8に記載の地中連続壁の構築方法は、請求項1〜の何れか1項に記載の地中連続壁の構築方法において、隣接する前記鋼矢板同士を、前記継手を介して嵌合して地盤内に打設し、前記継手を含む継手部に対して、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部を長手方向に沿って、互いに接触して重なるように打設し、前記重なっている部分の長手方向の両端のうち、地上側の一端のみを拘束し、更に前記打設された鋼矢板に隣接するように他の鋼矢板を前記継手を介して嵌合して地盤内に打設した後、当該継手を含む継手部に対して前記鋼材を打設することを順次実行することにより壁体を構築することを特徴とする。 The construction method of the underground continuous wall according to claim 8 of the present application is the construction method of the underground continuous wall according to any one of claims 1 to 5 , wherein the adjacent steel sheet piles are connected to each other via the joint. And fitting into the ground, and with respect to the joint portion including the joint, the flange portion in the steel material of the cross-section H shape or the flange portion in the steel material of the cross-section T shape along the longitudinal direction, Other steel sheet piles are placed so as to be in contact with each other and constrain only one end on the ground side of both ends in the longitudinal direction of the overlapping parts, and further adjacent to the placed steel sheet pile Is inserted into the ground by fitting through the joint, and then the wall body is constructed by sequentially executing the steel material against the joint portion including the joint. .

上述した構成からなる本発明では、鋼矢板の継手部と断面がH形状又はT形状の鋼材が直接接触し施工され、鋼矢板に作用する荷重を断面がH形状又はT形状の鋼材が負担するため、鋼矢板のみで構成される地中連続壁に対してはるかに高い剛性をもつ地中連続壁を構築することができる。   In the present invention having the above-described configuration, the steel sheet pile joint portion and the steel material having a H-shaped or T-shaped cross section are directly contacted and constructed, and the steel material having the H-shaped or T-shaped cross section bears the load acting on the steel sheet pile. Therefore, it is possible to construct an underground continuous wall having much higher rigidity than an underground continuous wall composed only of steel sheet piles.

また、鋼矢板と断面がH形状又はT形状の鋼材で構成された地中連続壁用鋼材は、長手方向の一端のみをコーピング、ボルト、ドリルねじ、溶接で拘束する構造であるため、溶接以外の拘束方法では鋼矢板の矯正を行う必要がなく、溶接による拘束方法においても鋼矢板の変形量を従来技術よりも抑えることが可能である。   In addition, the steel material for underground continuous wall, which is composed of steel sheet piles and steel materials having a cross section of H shape or T shape, has a structure in which only one end in the longitudinal direction is constrained by coping, bolts, drill screws, and welding. In this restraining method, it is not necessary to correct the steel sheet pile, and even in the restraining method by welding, the deformation amount of the steel sheet pile can be suppressed as compared with the prior art.

鋼矢板の継手部と断面がH形状又はT形状の鋼材を直接接触し施工する方法としては、鋼矢板のウェブ部と断面がH形状又はT形状の鋼材のフランジ部が接するように断面がH形状又はT形状の鋼材を施工する方法も考えられるが、この場合には断面がH形状又はT形状の鋼材の位置あわせ、および施工精度を確保するために十分な配慮が必要となる。断面がH形状又はT形状の鋼材のフランジ部長手方向に沿って連続的もしくは断続的に固着したガイドを鋼矢板の継手部と沿わせて施工することで、断面がH形状もしくはT形状の鋼材の位置あわせが容易となり、かつ施工精度を向上させることができる。   As a method of directly contacting and constructing a steel sheet pile joint part and a steel material having a cross section of H shape or T shape, the cross section is H so that the web part of the steel sheet pile and the flange part of the steel material having a cross section of H shape or T shape are in contact. A method of constructing a steel material having a shape or a T shape is also conceivable, but in this case, sufficient consideration is necessary to ensure the alignment of the steel material having a cross section of the H shape or the T shape and the construction accuracy. A steel material with a cross-section of H or T-shape, by installing a guide that is continuously or intermittently fixed along the longitudinal direction of the flange of a steel material with a cross-section of H or T. Can be easily aligned, and the construction accuracy can be improved.

ボルト接合を行う場合、鋼矢板と断面がH形状又はT形状の鋼材の一端のみを接合し、ボルト本数を減らすことができるためボルト孔の加工、軸力管理などの煩雑な作業を従来技術よりも抑えることが可能である。   When bolted, only one end of the steel sheet pile and H-shaped or T-shaped steel material can be joined and the number of bolts can be reduced. Therefore, complicated work such as bolt hole processing and axial force management is required. Can also be suppressed.

この結果、工場にて煩雑な管理加工を行う必要性はなくなり、必ずしも地中連続壁用鋼材を工場で製作する必要もなく、鋼矢板と断面がH形状又はT形状の鋼材を個別に搬送した後、現地サイトもしくはその近傍サイトにおいて組立て加工を行うことができる。そのため、現地サイトへは鋼矢板とH形状の鋼材を分けて搬送することができ、この場合は、搬送における非効率性が発生することなく、搬送コストを1/2〜1/3程度まで低減することができる。   As a result, there is no need to perform complicated management processing at the factory, and it is not always necessary to manufacture steel materials for underground continuous walls at the factory, and steel sheet piles and steel materials having a cross section of H shape or T shape are individually conveyed. Thereafter, assembly processing can be performed at the local site or a nearby site. Therefore, steel sheet piles and H-shaped steel can be transported separately to the local site. In this case, transport costs are reduced to about 1/2 to 1/3 without inefficiencies in transport. can do.

また、同程度の剛性をもつ従来U形鋼矢板と比較して鋼材重量を低減し、経済性のある地中連続壁を構築することができる。   Moreover, compared with the conventional U-shaped steel sheet pile with comparable rigidity, steel material weight can be reduced and an underground underground wall with economy can be constructed | assembled.

以下、本発明を実施するための最良の形態として、土留め壁や護岸壁、道路工事などの擁壁に用いられる地中連続壁について、図面を参照しながら詳細に説明をする。   Hereinafter, as the best mode for carrying out the present invention, an underground continuous wall used for retaining walls for earth retaining walls, revetment walls, road construction and the like will be described in detail with reference to the drawings.

本発明を適用した地中連続壁1は、例えば図1に示すように、鋼矢板2と、H形鋼3とを備えている。鋼矢板2は、隣接する他の鋼矢板2との間で継手を介して連結されていわゆる壁体を構成してなる。ちなみに、この鋼矢板2は予め地盤中に打設された既設のもので構成されていてもよく、H形鋼3は、補強用として事後的に地盤内に打設されるものとして構成されていてもよい。   The underground continuous wall 1 to which the present invention is applied includes a steel sheet pile 2 and an H-shaped steel 3 as shown in FIG. The steel sheet pile 2 is connected to another adjacent steel sheet pile 2 via a joint to form a so-called wall body. By the way, this steel sheet pile 2 may be composed of an existing one that has been previously cast in the ground, and the H-section steel 3 is configured to be subsequently placed in the ground for reinforcement. May be.

図2は、本発明を適用した地中連続壁1における2つの鋼矢板2並びにH形鋼3に着目した場合の平面図を示している。また、図3には、地盤に埋設された鋼矢板2、H形鋼3からなる地中連続壁1の側面図を示している。   FIG. 2: has shown the top view at the time of paying attention to the two steel sheet piles 2 and the H-section steel 3 in the underground continuous wall 1 to which this invention is applied. Moreover, in FIG. 3, the side view of the underground continuous wall 1 which consists of the steel sheet pile 2 and the H-section steel 3 which were embed | buried under the ground is shown.

鋼矢板2は、ウェブ部11の両側に図中内側に向かって傾斜するようにフランジ部12が一体に設けられ、そのフランジ部12の先端からウェブ部11に平行にアーム部13が設けられ、更にそのアーム部13の先端部に継手14が設けられている。この左右の継手14のうち、一方の継手14と、他方の継手14は、互いに点対称の形状となるように調整されている。この継手14は、隣接する鋼矢板2における継手14と互いに嵌合可能な形状で成形されており、特に嵌合時において継手14が相互に離脱しないように嵌合強度が高められている。なお、以下の説明においては、このアーム部13と継手14とをまとめて継手部8という。   The steel sheet pile 2 is integrally provided with a flange portion 12 so as to be inclined inward in the figure on both sides of the web portion 11, and an arm portion 13 is provided in parallel to the web portion 11 from the tip of the flange portion 12. Further, a joint 14 is provided at the tip of the arm portion 13. Of the left and right joints 14, one joint 14 and the other joint 14 are adjusted to have a point-symmetric shape. The joint 14 is formed in a shape that can be fitted to the joint 14 in the adjacent steel sheet piles 2, and the fitting strength is enhanced so that the joint 14 does not separate from each other particularly during fitting. In the following description, the arm portion 13 and the joint 14 are collectively referred to as a joint portion 8.

また、鋼矢板2は、熱間圧延加工による圧延鋼材であり、継手14が複雑な形状に成形され、継手14の強度が高められている鋼矢板であり、従来公知の一枚の鋼板を冷間曲げ加工により製作された鋼矢板と比較して、継手部を含めた鋼矢板全体としての曲げ剛性が高められている。   The steel sheet pile 2 is a rolled steel material obtained by hot rolling, and is a steel sheet pile in which the joint 14 is formed into a complicated shape and the strength of the joint 14 is increased. Compared to a steel sheet pile manufactured by inter-bending, the bending rigidity of the steel sheet pile as a whole including the joint is enhanced.

ちなみに、この鋼矢板2は、いわゆるハット形鋼矢板を例に挙げて説明をしているが、これに限定されるものではなく、Z形鋼矢板等のようにフランジ部を有するいかなる鋼矢板を適用するようにしてもよい。   By the way, this steel sheet pile 2 is described by taking a so-called hat-shaped steel sheet pile as an example, but is not limited to this, and any steel sheet pile having a flange portion such as a Z-shaped steel sheet pile or the like is used. You may make it apply.

H形鋼3は、圧延加工により製作されるものであって、ウェブ部21と、当該ウェブ部21の両端に設けられた一対のフランジ部22a、22bとから構成されている。このH形鋼3は、そのフランジ部22が、鋼矢板2における継手部8に対して、互いに接触されて重なっている。ここで重なっているという意味は、水平方向Aで見たときにこの継手部8と、フランジ部22との間で重複した領域を持つことを意味している。但しこの継手部8とフランジ部22とがあまりに離間していると本発明所期の効果が得られないことから、継手部8のいずれかの部位とフランジ部22とが接触されていることが必須となる。   The H-section steel 3 is manufactured by rolling, and includes a web portion 21 and a pair of flange portions 22a and 22b provided at both ends of the web portion 21. As for this H-section steel 3, the flange part 22 is mutually contacted and overlapped with respect to the joint part 8 in the steel sheet pile 2. FIG. Here, the meaning of overlapping means that there is an overlapping region between the joint portion 8 and the flange portion 22 when viewed in the horizontal direction A. However, if the joint portion 8 and the flange portion 22 are too separated from each other, the desired effect of the present invention cannot be obtained, so that any portion of the joint portion 8 and the flange portion 22 may be in contact with each other. Required.

また、図4に示すように、継手14と周接可能な曲面が形成されたガイド36を、H形鋼3における一フランジ部22の長手方向に沿って固着させることで、施工時において鋼矢板2における継手部8と一フランジ部22の位置あわせが容易となる。また、継手14の突起部にガイド36を沿わせるように施工することで施工性を向上させることができる。このガイド36は、断面円形状の鋼棒を使用するようにしてもよい。このガイド36は、H形鋼3の鋼材全長に亘って連続するように配設されてもよいし、また断続的に配設されていてもよい。 Further, as shown in FIG. 4, a steel sheet pile at the time of construction is secured by fixing a guide 36 formed with a curved surface capable of circumferential contact with the joint 14 along the longitudinal direction of one flange portion 22 in the H-section steel 3. 2 makes it easy to align the joint 8 and the one flange 22. Moreover, workability | operativity can be improved by constructing so that the guide 36 may be along the protrusion part of the coupling 14. FIG. The guide 36 may be a steel bar having a circular cross section. The guide 36 may be disposed so as to be continuous over the entire length of the steel material of the H-section steel 3, or may be disposed intermittently.

また、鋼矢板2とH形鋼3の各上端をコンクリート35によりコーピング処理している。図3(b)は、このコーピング処理が施された鋼矢板2とH形鋼3の各上端の頭部詳細断面を示している。頭部をコーピングすることにより、鋼矢板2とH形鋼3とが一体として荷重に抵抗することができ、高い剛性を発揮することが可能となる。   Further, the upper ends of the steel sheet pile 2 and the H-shaped steel 3 are coping treated with concrete 35. FIG. 3B shows a detailed cross-section of the head at each upper end of the steel sheet pile 2 and the H-section steel 3 that have been subjected to the coping process. By coping the head, the steel sheet pile 2 and the H-shaped steel 3 can integrally resist the load and can exhibit high rigidity.

本発明を適用した地中連続壁1は、上述した実施の形態に限定されることなく、例えば図5〜に示すように、頭部をコーピングする代替として、ボルトとナットにより接合するようにしてもよい。 Diaphragm wall 1 according to the present invention is not limited to the embodiments described above, for example, as shown in FIGS. 5 to 7 as a substitute for coping head, so as to bond the bolt and nut May be.

図5は、頭部をボルトとナットによる接合する場合の斜視図、図6は、その平面図を、図7はその側面図を示している。この図5〜において、上述した図1〜3と同一の構成要素、部材については、同一の符号を引用することにより以下での説明を省略する。 FIG. 5 is a perspective view when the head is joined with a bolt and a nut, FIG. 6 is a plan view thereof, and FIG. 7 is a side view thereof. 5 to 7 , the same components and members as those of FIGS. 1 to 3 described above are referred to by the same reference numerals, and the description thereof will be omitted.

継手部8とフランジ部22との間には介装材20が介装されている。そしてこの介装材20を介してこの継手部8とフランジ部22がボルト18、ナット19を介して連結される。ちなみに、このボルト18、ナット19を介した継手部8とフランジ部22の連結は、図5、7に示すように上端のみ実行する。これにより、継手部8とフランジ部22における重なっている部分の長手方向Bの両端のうち一端(上端)のみが拘束されることになる。   An interposition material 20 is interposed between the joint portion 8 and the flange portion 22. The joint portion 8 and the flange portion 22 are connected to each other via a bolt 18 and a nut 19 via the interposition material 20. Incidentally, the connection between the joint portion 8 and the flange portion 22 via the bolt 18 and the nut 19 is performed only at the upper end as shown in FIGS. As a result, only one end (upper end) of both ends in the longitudinal direction B of the overlapping portion of the joint portion 8 and the flange portion 22 is restrained.

H形鋼3におけるフランジ部22は、鋼矢板2における継手部8に対して、互いに接触で重なっていることを前提としている。継手部8は、その継手14がアーム部13よりもH形鋼3側に向けて突出している。この突出した継手14をH形鋼3におけるフランジ部22aに当接させた状態で固定したものである。かかる場合においても、アーム部13とフランジ部22aとの間は非接触となるため、その間に介装材20を介装させ、これらをボルト18とナット19で固定する。ちなみに、このボルト18とナット19の本数は、地盤60から作用する荷重に対して拘束部が破断しない本数となるように予め設計しておく。 It is assumed that the flange portion 22 in the H-shaped steel 3 overlaps with the joint portion 8 in the steel sheet pile 2 in contact with each other. In the joint portion 8, the joint 14 projects toward the H-section steel 3 side with respect to the arm portion 13. The protruding joint 14 is fixed in a state where it is brought into contact with the flange portion 22a of the H-section steel 3. Even in such a case, the arm portion 13 and the flange portion 22a are not in contact with each other. Therefore, the interposition material 20 is interposed therebetween, and these are fixed by the bolt 18 and the nut 19. Incidentally, the number of the bolts 18 and nuts 19 is designed in advance so that the restraining portion does not break against the load acting from the ground 60 .

即ち、本発明では、鋼矢板2における継手部8と、H形鋼3におけるフランジ部22とが長手方向に沿って、互いに接触して重なっていればよい。このとき、継手部におけるアーム部13と、フランジ部22とが略平行となっていることが望ましい。 That is, in this invention, the joint part 8 in the steel sheet pile 2 and the flange part 22 in the H-section steel 3 should just contact and overlap each other along a longitudinal direction. At this time, it is desirable that the arm portion 13 and the flange portion 22 in the joint portion 8 are substantially parallel.

図8は、介装材20を省略する構成を示しているが、かかる構成であっても本発明所期の効果を奏することは勿論である。   FIG. 8 shows a configuration in which the intervening material 20 is omitted, but it is a matter of course that the effect of the present invention can be achieved even with such a configuration.

なお、本発明を適用した地中連続壁1においては、上述したようにボルト18、ナット19を介した連結の代替として、ドリルねじを介してこれらを連結するようにしてもよい。また、本発明を適用した地中連続壁1においては、上述したボルト18、ナット19を介した連結の代替として、例えば図9に示すように溶接により継手部8とフランジ部22とを固着させるようにしてもよい。この図9の実施形態では、継手部8における継手14と、フランジ部22aとを溶接による溶着部29を介して互いに固着された例を示している。このように継手14とフランジ部22aを直接的に固着させるようにしてもよいし、アーム部13とフランジ部22aとの間に介装材20を介装させ、その介装材20を介して溶接して互いに固着させるようにしてもよい。   In the underground continuous wall 1 to which the present invention is applied, these may be connected via a drill screw as an alternative to the connection via the bolt 18 and the nut 19 as described above. Further, in the underground continuous wall 1 to which the present invention is applied, as an alternative to the connection via the bolt 18 and the nut 19 described above, the joint portion 8 and the flange portion 22 are fixed by welding, for example, as shown in FIG. You may do it. 9 shows an example in which the joint 14 in the joint portion 8 and the flange portion 22a are fixed to each other via a welded portion 29 by welding. In this way, the joint 14 and the flange portion 22a may be directly fixed, or the interposition material 20 is interposed between the arm portion 13 and the flange portion 22a, and the interposition material 20 is interposed therebetween. It may be welded and fixed to each other.

従来技術である鋼矢板とH形鋼を全長に亘って溶接加工した構造は、作用する荷重に対して鋼矢板とH形鋼が一体として抵抗するため高い断面性能を期待できる。一方、本発明を適用した鋼矢板2とH形鋼3の頭部のみを拘束した構造は、鋼矢板2とH形鋼3間の荷重伝達が頭部拘束部のみで行われるため全長に亘って溶接加工した構造に比べて剛性が劣るものの、溶接加工、形状測定、矯正作業、加工管理に費やす労力や、コストを低減させることができ、保管、運搬効率に優れた地中連続壁を構築することが可能となる。   A conventional structure in which a steel sheet pile and an H-shaped steel are welded over the entire length can be expected to have a high cross-sectional performance because the steel sheet pile and the H-shaped steel integrally resist the acting load. On the other hand, the structure in which only the head of the steel sheet pile 2 and the H-section steel 3 to which the present invention is applied is confined over the entire length because load transmission between the steel sheet pile 2 and the H-section steel 3 is performed only by the head restraint section. Although it is inferior in rigidity compared to the welded structure, it can reduce the labor and cost spent on welding, shape measurement, correction work, process management, and builds a continuous underground wall with excellent storage and transport efficiency It becomes possible to do.

なお、本発明は、上述したようなH形鋼フランジ部22aと継手部8とを連結する構成に限定されるものではなく、例えば図10に示すようにフランジ部22bと、継手部8とを連結する構成を採用するようにしてもよい。   In addition, this invention is not limited to the structure which connects the H-shaped steel flange part 22a and the joint part 8 as mentioned above, For example, as shown in FIG. 10, the flange part 22b and the joint part 8 are made. You may make it employ | adopt the structure to connect.

更に図11に示すようにH形鋼3の代替として、T形鋼5により補強する構成としてもよい。このときT形鋼5におけるフランジ部38を、鋼矢板2における継手部8に対して接触させて重ならせ、重なっている部分の長手方向の両端のうち、一端のみを上述した各種連結方法により拘束されていることとなる。   Furthermore, as shown in FIG. 11, a T-shaped steel 5 may be used as an alternative to the H-shaped steel 3. At this time, the flange portion 38 in the T-shaped steel 5 is brought into contact with and overlapped with the joint portion 8 in the steel sheet pile 2, and only one end of the overlapping portions in the longitudinal direction is subjected to the various connection methods described above. It will be restrained.

また、図12は、鋼矢板2としてZ形鋼矢板2’を適用した実施形態を示している。このZ形鋼矢板2’は、フランジ部12の両端にそれぞれアーム部13、継手14が形成されてなり、断面略Z字となるように折り曲げられて構成されている。かかるZ形鋼矢板2’を連結するとともに、鋼矢板2と同様に、継手部8と、H形鋼3におけるフランジ部22とが長手方向に沿って、互いに接触して重ならせ、上端を連結する。   FIG. 12 shows an embodiment in which a Z-shaped steel sheet pile 2 ′ is applied as the steel sheet pile 2. The Z-shaped steel sheet pile 2 ′ is formed by forming an arm portion 13 and a joint 14 at both ends of the flange portion 12, and is bent so as to have a substantially Z-shaped cross section. While connecting this Z-shaped steel sheet pile 2 ', like the steel sheet pile 2, the joint part 8 and the flange part 22 in the H-shaped steel 3 are brought into contact with each other along the longitudinal direction so as to overlap each other. Link.

なおH形鋼3の代替として断面H形状であればいかなる鋼材を使用してもよい。またT形鋼5の代替として、断面T形状であればいかなる鋼材を使用してもよい。   Any steel material may be used as long as it has a cross-sectional H shape as an alternative to the H-section steel 3. As an alternative to the T-shaped steel 5, any steel material having a T-shaped cross section may be used.

次に本発明を適用した地中連続壁1の構築方法について、補強材としてH形鋼3を用いる場合を例にとり説明をする。   Next, the construction method of the underground continuous wall 1 to which the present invention is applied will be described by taking as an example the case of using the H-shaped steel 3 as a reinforcing material.

先ず図13(a)に示すように鋼矢板2を継手14を介して嵌合して地盤内に打設する。その結果、この鋼矢板2を連結した壁体が構築された状態となる。   First, as shown in FIG. 13 (a), the steel sheet pile 2 is fitted through the joint 14 and placed in the ground. As a result, it will be in the state where the wall body which connected this steel sheet pile 2 was constructed.

次に図13(b)に示すように、継手部8に対してH形鋼3のフランジ部22が重なるように打設し、地上側の一端のみを拘束する。   Next, as shown in FIG. 13 (b), the flange portion 22 of the H-section steel 3 is placed over the joint portion 8 so as to restrain only one end on the ground side.

次に図13(c)に示すように、残りの継手部8に対しても同様にH形鋼3を打設し、地上側の一端のみを拘束していく。   Next, as shown in FIG. 13 (c), the H-section steel 3 is similarly applied to the remaining joint portion 8, and only one end on the ground side is constrained.

即ち、この図13に示す方法では、最初に隣接する鋼矢板2間の連結を終了させて壁体を構成した後に、H形鋼3によりこれを補強していく。即ち、鋼矢板2を連結することにより得られた既設の壁体に対して、事後的にこのH形鋼3により壁体の補強を行うケースも想定したものである。これにより既存護岸として鋼矢板2からなる壁体が形成されていた場合において、かかる既存護岸の耐震補強を容易に行うことが可能となる。なお、この図13に説明した工法を新設の護岸を構築する際においても適用可能であることは勿論である。   That is, in the method shown in FIG. 13, first, the connection between the adjacent steel sheet piles 2 is terminated and the wall body is formed, and then this is reinforced by the H-shaped steel 3. That is, it is assumed that the existing wall obtained by connecting the steel sheet piles 2 is retrofitted with the H-shaped steel 3 afterwards. Thereby, when the wall body which consists of the steel sheet pile 2 is formed as an existing revetment, it becomes possible to perform the seismic reinforcement of this existing revetment easily. Of course, the construction method described in FIG. 13 can also be applied when constructing a new revetment.

このような構築方法に加えて、以下に説明するように、壁体と補強材を交互に取り付ける構築方法を適用するようにしてもよい。   In addition to such a construction method, as will be described below, a construction method for alternately attaching wall bodies and reinforcing materials may be applied.

先ず図14(a)に示すように、隣接する鋼矢板2同士を、継手部8を介して嵌合して地盤内に打設する。   First, as shown to Fig.14 (a), adjacent steel sheet piles 2 are fitted through the joint part 8, and are laid in the ground.

次に図14(b)に示すように、継手部8に対して、H形鋼3のフランジ部22が重なるように打設する。その結果、互いに連結された2つの鋼矢板2と、かかる鋼矢板2間の継手部8に対して1つのH形鋼3が打設された状態となる。   Next, as shown in FIG. 14B, the flange portion 22 of the H-section steel 3 is placed on the joint portion 8 so as to overlap. As a result, the two steel sheet piles 2 connected to each other and one H-section steel 3 are driven into the joint portion 8 between the steel sheet piles 2.

次に図14(c)に示すように、互いに連結された2つの鋼矢板2に対して、さらに他の鋼矢板2を連結する。   Next, as shown in FIG.14 (c), the other steel sheet pile 2 is further connected with respect to the two steel sheet piles 2 connected mutually.

次に、図14(d)に示すように、この新たに連結された他の鋼矢板2との間で形成された継手部8に対してH形鋼3を打設する。   Next, as shown in FIG.14 (d), the H-section steel 3 is driven with respect to the joint part 8 formed between this newly connected other steel sheet piles 2. As shown in FIG.

このようにして鋼矢板2とH形鋼3の打設を順次実行していくことにより、地中連続壁1が形成されることになる。この図14に示すプロセスは、既存の壁体を事後的に補強するのではなく、いわゆる壁体を新設していくケースにおいて適用される。   The underground continuous wall 1 is formed by sequentially executing the steel sheet pile 2 and the H-shaped steel 3 in this manner. The process shown in FIG. 14 is applied to a case where a so-called wall body is newly installed instead of retrofitting an existing wall body.

なお、このH形鋼3を打設する際には、図4に示すガイド36により誘導させることで、施工性を向上させることが可能となる。かかる場合には、曲面が形成されたガイド36をH形鋼3のフランジ部22の長手方向に予め配設し、鋼矢板2の継手14に前記ガイド36の曲面を沿わせつつ鋼材の打設を行う。これにより、建て込み時の位置あわせが容易となり、またH形鋼3を打設する際に鋼矢板2に対してブレてしまうのを軽減させることが可能となる。   When the H-shaped steel 3 is placed, it is possible to improve the workability by guiding it with the guide 36 shown in FIG. In such a case, a guide 36 having a curved surface is disposed in advance in the longitudinal direction of the flange portion 22 of the H-section steel 3, and the steel material is placed while the curved surface of the guide 36 is aligned with the joint 14 of the steel sheet pile 2. I do. Thereby, alignment at the time of erection becomes easy, and it becomes possible to reduce blurring with respect to the steel sheet pile 2 when placing the H-section steel 3.

以上、本発明を適用した地中連続壁1及びその構築方法について説明をした。本発明によれば、鋼矢板2を連結することにより壁体を構築した後、H形鋼3を打設するか、もしくは鋼矢板2とH形鋼3とを交互に打設していくため、従来技術のように、鋼矢板とH形鋼とを一体化した状態で搬送する必要がなくなり、運搬効率、保管効率を向上させることができる。   The underground continuous wall 1 to which the present invention is applied and the construction method thereof have been described above. According to the present invention, after the wall body is constructed by connecting the steel sheet piles 2, the H-section steel 3 is driven, or the steel sheet pile 2 and the H-section steel 3 are alternately driven. As in the prior art, it is not necessary to transport the steel sheet pile and the H-shaped steel in an integrated state, and the transport efficiency and storage efficiency can be improved.

また、本発明を適用した地中連続壁の構築方法では、H形鋼3と鋼矢板2について長手方向の一端のみを拘束すればよいことから、施工労力の負担を軽減させることができる。コーピング処理により頭部を拘束する場合、鋼矢板頭部のコーピング処理は通常の鋼矢板工事で行われており、本発明の構造における特有の作業ではない。また、コーピング、ボルト18やナット19、ドリルねじ等により頭部を拘束する場合、従来技術である溶接による変形といった課題を考慮する必要はない。 また、本発明では、仮に溶接によりH形鋼3と鋼矢板2とを固着させる場合においても、その溶接領域は、H形鋼3と鋼矢板2の長手方向の両端のうち地上側の一端のみとすればよい。このため溶接領域を減らすことができ、溶接熱による矢板の変形を抑制することが可能となる。   Moreover, in the construction method of the underground continuous wall to which the present invention is applied, it is only necessary to constrain only one end in the longitudinal direction of the H-section steel 3 and the steel sheet pile 2, so that the burden of construction labor can be reduced. When the head is constrained by the coping process, the coping process of the steel sheet pile head is performed by ordinary steel sheet pile work and is not a specific operation in the structure of the present invention. Further, when the head is constrained by coping, bolts 18, nuts 19, drill screws, or the like, it is not necessary to consider the problem of deformation due to welding, which is a conventional technique. Further, in the present invention, even when the H-section steel 3 and the steel sheet pile 2 are fixed by welding, the welding region is only one end on the ground side of both ends in the longitudinal direction of the H-section steel 3 and the steel sheet pile 2. And it is sufficient. For this reason, a welding area | region can be reduced and it becomes possible to suppress the deformation | transformation of the sheet pile by welding heat.

本発明を適用した地中連続壁の斜視図である。It is a perspective view of the underground continuous wall to which the present invention is applied. 本発明を適用した地中連続壁における2つの鋼矢板並びにH形鋼に着目した場合の平面図である。It is a top view at the time of paying attention to two steel sheet piles and H-section steel in an underground continuous wall to which the present invention is applied. 地盤に埋設された鋼矢板の補強構造の側面図である。It is a side view of the reinforcement structure of the steel sheet pile embedded in the ground. 継手と周接可能な曲面が形成されたガイドを設ける実施形態を示す図である。It is a figure which shows embodiment which provides the guide in which the curved surface which can be circumferentially contacted with a coupling was formed. 本発明を適用した地中連続壁の他の実施形態における斜視図である。It is a perspective view in other embodiment of the underground continuous wall to which this invention is applied. 本発明を適用した地中連続壁における2つの鋼矢板並びにH形鋼に着目した場合の他の実施形態における平面図である。It is a top view in other embodiments at the time of paying attention to two steel sheet piles and H section steel in an underground continuous wall to which the present invention is applied. 地盤に埋設された鋼矢板の補強構造の他の実施形態における側面図である。It is a side view in other embodiments of the reinforcement structure of the steel sheet pile embedded in the ground. 介装材を介さない実施形態を示す平面図である。It is a top view which shows embodiment which does not interpose an intervention material. 継手部における継手と、フランジ部とを溶接による溶着部を介して互いに固着した実施形態を示す図である。It is a figure which shows embodiment which mutually joined the joint and flange part in a joint part through the welding part by welding. 本発明を適用した地中連続壁における2つの鋼矢板並びにH形鋼に着目した場合の他の実施形態における平面図である。It is a top view in other embodiments at the time of paying attention to two steel sheet piles and H section steel in an underground continuous wall to which the present invention is applied. T形鋼を補強材として適用する実施形態について説明するための図である。It is a figure for demonstrating embodiment which applies T-shaped steel as a reinforcing material. Z形鋼矢板を適用する実施形態について説明するための図である。It is a figure for demonstrating embodiment to which a Z-shaped steel sheet pile is applied. 本発明を適用した地中連続壁の構築方法について説明するための図である。It is a figure for demonstrating the construction method of the underground continuous wall to which this invention is applied. 本発明を適用した地中連続壁の他の構築方法について説明するためのである。It is a figure for demonstrating the other construction method of the underground continuous wall to which this invention is applied. 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. 特許文献4および特許文献7に記載の発明が成立するための条件について説明するための図である。It is a figure for demonstrating the conditions for the invention of patent document 4 and patent document 7 to be materialized.

符号の説明Explanation of symbols

1 地中連続壁
2 鋼矢板
3 H形鋼
8 継手部
11 鋼矢板のウェブ部
12 鋼矢板のフランジ部
13 鋼矢板のアーム部
14 継手
18 ボルト
19 ナット
20 介装材
21 断面H形状の鋼材のウェブ部
22 断面H形状の鋼材のフランジ部
29 溶着部
36 ガイド
DESCRIPTION OF SYMBOLS 1 Underground continuous wall 2 Steel sheet pile 3 H-section steel 8 Joint part 11 Steel sheet pile web part 12 Steel sheet pile flange part 13 Steel sheet pile arm part 14 Joint 18 Bolt 19 Nut 20 Interstitial material 21 Cross section H-shaped steel material Web section 22 Steel section flange section 29 welded section 36 guide

Claims (8)

幅方向の中央部にウェブ部を有し且つ両端部に継手を有する鋼矢板と、ウェブ部の端部にフランジ部を有する断面H形状又は断面T形状の鋼材とからなる地中連続壁において、
隣接する鋼矢板間を連結するための前記継手を含む継手部と、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部とが長手方向に沿って、互いに接触して重なっていると共に、前記重なっている部分の長手方向の両端のうち、一端のみが拘束され、
前記継手は、前記フランジ部に向けて突設され、
前記継手と周接可能な曲面が形成されたガイドが、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部に長手方向にわたって連続的もしくは断続的に固着されてなること
を特徴とする地中連続壁。
In the underground continuous wall composed of a steel sheet pile having a web portion at the center in the width direction and having joints at both ends, and a steel material having a cross-sectional H shape or a T cross-section having a flange portion at the end of the web portion,
A joint portion including the joint for connecting between adjacent steel sheet piles and one flange portion in the steel material having the H-shaped cross section or a flange portion in the steel material having the T-shaped cross section are in contact with each other along the longitudinal direction. And, at both ends in the longitudinal direction of the overlapping portion, only one end is restrained,
The joint protrudes toward the flange portion,
A guide having a curved surface that can be circumferentially contacted with the joint is fixed continuously or intermittently in the longitudinal direction to one flange portion of the steel material having the H-shaped cross section or the flange portion of the steel material having the T-shaped cross section. An underground continuous wall characterized by that .
前記鋼矢板は、Z形鋼矢板、ハット形鋼矢板又は直線鋼矢板であること
を特徴とする請求項1に記載の地中連続壁。
The steel sheet piles, characterized in that it is a Z-shaped steel sheet pile, hat-shaped steel sheet pile or straight steel sheet piles, diaphragm wall according to claim 1.
前記断面H形状の鋼材は、H形鋼であり、
前記断面T形状の鋼材は、T形鋼であること
を特徴とする請求項1又は2に記載の地中連続壁。
The steel material having the H-shaped cross section is an H-shaped steel,
Steel of the cross-sectional T shape, characterized in that it is a T-shaped steel, diaphragm wall according to claim 1 or 2.
前記一端の拘束は、コーピング、ボルト、ドリルねじ、溶接、の何れかまたはこれら2
つ以上を組み合わせたものによるものであること
を特徴とする、請求項1〜3の何れか1項に記載の地中連続壁。
The constraint at the one end may be any one of coping, bolt, drill screw, welding, or these 2
The underground continuous wall according to any one of claims 1 to 3, wherein the underground continuous wall is a combination of two or more.
前記一端が拘束されるとき、前記継手部と、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部との間に介装材が介装されてなること
を特徴とする、請求項1〜のうち何れか1項に記載の地中連続壁。
When the one end is constrained, an interposition material is interposed between the joint portion and one flange portion in the steel material having the H-shaped cross section or the flange portion in the steel material having the T-shaped cross section. The underground continuous wall according to any one of claims 1 to 4 .
請求項1〜の何れか1項に記載の地中連続壁の構築方法において、
複数の前記鋼矢板同士を、前記継手を介して嵌合して地盤内に打設することで前記鋼矢板による壁体を構築した後、
前記継手を含む継手部に対して、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部を長手方向に沿って、互いに接触して重なるように打設し、
前記重なっている部分の長手方向の両端のうち、地上側の一端のみを拘束し、
曲面が形成されたガイドを前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部の長手方向に予め配設し、
前記鋼矢板の継手に前記ガイドの曲面を沿わせつつ前記鋼材を打設すること
を特徴とする地中連続壁の構築方法。
In the construction method of the underground continuous wall according to any one of claims 1 to 5 ,
After constructing a wall body by the steel sheet pile by fitting a plurality of the steel sheet piles through the joint and placing in the ground,
For the joint part including the joint, one flange part in the steel material having the H-shaped cross section or the flange part in the steel material having the T-shaped cross section is placed so as to contact and overlap each other along the longitudinal direction,
Of both ends in the longitudinal direction of the overlapping portion, only one end on the ground side is restrained,
A guide in which a curved surface is formed is disposed in advance in the longitudinal direction of one flange portion in the steel material having the H cross section or the flange portion in the steel material having the T shape in cross section,
The method for constructing an underground continuous wall , characterized in that the steel material is placed along a curved surface of the guide along a joint of the steel sheet pile .
請求項1〜の何れか1項に記載の地中連続壁の構築方法において、
既設で両端部に継手を有する鋼矢板で構築された地中連続壁を用い、
前記継手を含む継手部に対して、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部を長手方向に沿って、互いに接触して重なるように打設し、
前記重なっている部分の長手方向の両端のうち、地上側の一端のみを拘束すること
を特徴とする地中連続壁の構築方法。
In the construction method of the underground continuous wall according to any one of claims 1 to 5 ,
Using an underground continuous wall built with steel sheet piles with joints at both ends,
For the joint part including the joint, one flange part in the steel material having the H-shaped cross section or the flange part in the steel material having the T-shaped cross section is placed so as to contact and overlap each other along the longitudinal direction,
Among both longitudinal ends of the portion it said overlapped, characterized by constraining only one end of the ground side, how to build a diaphragm wall.
請求項1〜の何れか1項に記載の地中連続壁の構築方法において、
隣接する前記鋼矢板同士を、前記継手を介して嵌合して地盤内に打設し、
前記継手を含む継手部に対して、前記断面H形状の鋼材における一のフランジ部又は前記断面T形状の鋼材におけるフランジ部を長手方向に沿って、互いに接触して重なるように打設し、
前記重なっている部分の長手方向の両端のうち、地上側の一端のみを拘束し、
更に前記打設された鋼矢板に隣接するように他の鋼矢板を前記継手を介して嵌合して地盤内に打設した後、当該継手を含む継手部に対して前記鋼材を打設することを順次実行することにより壁体を構築すること
を特徴とする地中連続壁の構築方法。
In the construction method of the underground continuous wall according to any one of claims 1 to 5 ,
The steel sheet piles adjacent to each other are fitted through the joint and placed in the ground,
For the joint part including the joint, one flange part in the steel material having the H-shaped cross section or the flange part in the steel material having the T-shaped cross section is placed so as to contact and overlap each other along the longitudinal direction,
Of both ends in the longitudinal direction of the overlapping portion, only one end on the ground side is restrained,
Furthermore, after fitting another steel sheet pile through the joint so as to be adjacent to the placed steel sheet pile and placing it in the ground, the steel material is placed on the joint portion including the joint. characterized by constructing a wall by sequentially executing the method constructing underground continuous wall.
JP2008100978A 2008-04-09 2008-04-09 Underground continuous wall and its construction method Expired - Fee Related JP5163246B2 (en)

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