JP5926871B1 - A method for preventing steel sheet piles from falling down during non-excavation, and a non-excavated installation method in the wall - Google Patents
A method for preventing steel sheet piles from falling down during non-excavation, and a non-excavated installation method in the wall Download PDFInfo
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Abstract
【課題】一定範囲の敷地と公道との境界部分などに周知の工法で連接させて打設した複数の鋼矢板を順次地中に圧入する際に、既に所定深度まで圧入された鋼矢板が共下がりするのを防止する工法及びその工法を用いて止水壁を非掘削で所定深度に設置する壁体地中設置工法を提供することを目的とする。【解決手段】連接された複数の鋼矢板のうちの一の鋼矢板の天端近傍に第１ナットを溶接し、溶接された該第１ナットに所定の長ねじを螺合した後、該天端に嵌合するヤットコで該一の鋼矢板を所定深度の地中に圧入する第１工程と、地中に圧入された一の鋼矢板から地上に突き出した長ねじを、地面に配置された鋼材に第２ナットで固定する第２工程と、を有し、一の鋼矢板に隣接する他の一の鋼矢板に対し第１工程を行う際に、他の一の鋼矢板から一の鋼矢板に作用する下向きの力を第２工程で固定した長ねじで支えることにより一の鋼矢板の共下がりを防止する。【選択図】図１０[PROBLEMS] When a plurality of steel sheet piles, which are connected by a well-known method at a boundary between a site of a certain range and a public road, are sequentially pressed into the ground, the steel sheet piles already pressed to a predetermined depth are shared. It is an object of the present invention to provide a method for preventing a descent and a wall underground installation method for installing a water blocking wall at a predetermined depth without excavation using the method. A first nut is welded in the vicinity of the top end of one steel sheet pile among a plurality of connected steel sheet piles, and a predetermined long screw is screwed onto the welded first nut, and then the top A first step of press-fitting the one steel sheet pile into the ground at a predetermined depth with a Yatco fitted to the end, and a long screw projecting to the ground from the one steel sheet pile pressed into the ground were arranged on the ground A second step of fixing to the steel material with a second nut, and when performing the first step on another steel sheet pile adjacent to the one steel sheet pile, from one other steel sheet pile to one steel By supporting the downward force acting on the sheet pile with the long screw fixed in the second step, the single steel sheet pile is prevented from falling down. [Selection] Figure 10
Description
本発明は、鋼矢板を地中の所定深度に圧入する際に、その鋼矢板に連結された、既に所定深度に圧入されている鋼矢板が共下がりするのを防止する共下がり防止工法、及び鋼矢板の壁体を非掘削で所定深度の地中に設置する壁体地中設置工法に関する。 The present invention, when press-fitting a steel sheet pile to a predetermined depth in the ground, connected to the steel sheet pile, a steel sheet pile already press-fitted to a predetermined depth to prevent the co-falling prevention method, and The present invention relates to a wall body underground installation method in which a steel sheet pile wall body is installed in the ground at a predetermined depth without excavation.
地下水層を有する地盤は、砂などの粒子が互いにくっつきながら積み重なり、その間に水が存在している。かかる地盤は、地震がなければ安定しているが、地震で揺すられると、水圧が上昇し、くっついていた粒子が離れるため水中に砂の粒子が浮いた状態となって液状化現象が起こる。その結果、地盤があたかも液体のような挙動をするので、その地盤上の建造物は、沈んだり傾いたりする。このような液状化現象を回避するには、その危険性がある領域の周囲に止水壁等を形成し、その領域内の地下水を排出して水位を低下させておく方法が有効である。
例えば、液状化現象の危険性がある一定領域の地盤を鋼矢板で締め切り、且つ砕石を入れた鉄筋籠を地中構造物の長手方向に沿って連接させた液状化対策工法（特許文献１参照）、地盤の液状化防止範囲を鋼矢板で隔壁する液状化防止工法（特許文献２参照）が開示されている。
また、建造物が地下構造物で、その両側に鋼矢板を打設する場合に、液状化層が厚いと鋼矢板を長尺にしなければならないので材料費、施工費が割高になる。そこで、地下構造物の高さをＨ１、鋼矢板の天端から地下構造物の底面に向かう距離をＬ１としたとき、鋼矢板の天端が地下水位面以下で、かつ、Ｌ１／Ｈ１≧０．３０となるように鋼矢板を打設する方法（特許文献３参照）などが開示されている。
一方、鋼矢板を地中に連接させて打設する際に、既に打設された鋼矢板が共下がりするのを防止する方法として、対向する一対の案内常規に配設されたラバースプリングで鋼矢板の側壁を圧接し、打ち込み時における鋼矢板の共下がりを防止する打込案内治具（特許文献４参照）、打設された鋼矢板連接部および連接部両側の鋼矢板側壁を覆うように鋼矢板天端部に被せ、締付具で鋼矢板側壁を締め付けることにより鋼矢板相互を固定し、新たな鋼矢板を打設する際の共下がりを防止する鋼矢板打設用治具（特許文献５参照）が開示されている。
In the ground with a groundwater layer, sand and other particles are piled up while sticking to each other, and water exists between them. Such ground is stable if there is no earthquake, but if it is shaken by an earthquake, the water pressure rises and the particles that are stuck are separated, so that sand particles float in the water and a liquefaction phenomenon occurs. As a result, the ground behaves like a liquid, and the building on the ground sinks or tilts. In order to avoid such a liquefaction phenomenon, it is effective to form a water blocking wall or the like around the area where there is a risk, and to discharge the ground water in the area to lower the water level.
For example, a liquefaction countermeasure method in which the ground in a certain area where there is a risk of liquefaction is cut off with steel sheet piles, and rebar rods containing crushed stone are connected along the longitudinal direction of the underground structure (see Patent Document 1) ), A liquefaction prevention construction method (see Patent Document 2) in which the liquefaction prevention range of the ground is partitioned by a steel sheet pile is disclosed.
In addition, when the building is an underground structure and steel sheet piles are placed on both sides thereof, if the liquefied layer is thick, the steel sheet pile must be made long, so the material cost and construction cost are high. Therefore, when the height of the underground structure is H1 and the distance from the top of the steel sheet pile to the bottom of the underground structure is L1, the top of the steel sheet pile is below the groundwater level and L1 / H1 ≧ 0. .. 30 (see Patent Document 3) and the like.
On the other hand, as a method of preventing the steel sheet piles already placed from falling together when the steel sheet piles are connected to the ground, the steel springs are disposed with a pair of opposing guide rulers. A driving guide jig (see Patent Document 4) that presses the side wall of the sheet pile to prevent the steel sheet pile from falling down at the time of driving, and covers the steel sheet pile side wall on both sides of the steel sheet pile connecting portion and the connecting portion. Steel sheet pile placing jig (patented on top of steel sheet pile top), fixing steel sheet piles by fastening steel sheet pile sidewalls with fasteners, and preventing co-falling when placing new steel sheet piles Reference 5) is disclosed.
しかしながら、特許文献４及び５に開示された方法は、鋼矢板の天端が地表面と面一となるように打設する際に共下がりを防止するには有効であるが、鋼矢板の天端を地中の一定深度まで圧入する必要がある場合の共下がり防止には適用できない。すなわち、液状化現象の危険性がある敷地と公道などとの境界等に液状化対策用止水壁を地表面と面一に設置すると、その敷地内に建造する構造物と公道上の配管等とを繋ぐ管路等の建設が困難になる。
上記事情に鑑み、本発明は、一定範囲の敷地と公道などとの境界部分等に周知の工法で連接させて打設した鋼矢板を地中に圧入する際に、既に所定深度まで圧入された鋼矢板が共下がりするのを防止する工法及びその工法を用いて非掘削で所定深度に止水壁を設置する壁体地中設置工法を提供することを目的とする。
However, the methods disclosed in Patent Documents 4 and 5 are effective in preventing co-falling when placing the steel sheet pile so that the top end of the steel sheet pile is flush with the ground surface. It cannot be applied to prevent co-falling when it is necessary to press-fit the edge to a certain depth in the ground. In other words, if a liquefaction-preventing wall is installed on the same level as the ground surface at the boundary between the site where there is a risk of liquefaction and public roads, etc., the structure to be built in the site and the piping on the public road, etc. It becomes difficult to construct a pipeline that connects the two.
In view of the above circumstances, the present invention has already been press-fitted to a predetermined depth when a steel sheet pile placed by connecting a well-known construction method to a boundary portion between a site of a certain range and a public road or the like is press-fitted into the ground. An object of the present invention is to provide a construction method for preventing the steel sheet piles from falling together and a wall body underground construction method in which a water blocking wall is installed at a predetermined depth without excavation using the construction method.
本発明の共下がり防止工法は、連接された複数の鋼矢板のうちの一の鋼矢板の天端近傍に第１ナットを溶接し、溶接された該第１ナットに所定の長ねじを螺合した後、該天端に嵌合するヤットコで該一の鋼矢板を所定深度の地中に圧入する第１工程と、上記地中に圧入された上記一の鋼矢板から地上に突き出した上記長ねじを、地面に配置された鋼材に第２ナットで固定する第２工程と、を有し、上記一の鋼矢板に隣接する他の一の鋼矢板に対し上記第１工程を行う際に、該他の一の鋼矢板から該一の鋼矢板に作用する下向きの力を上記第２工程で固定した上記長ねじで支えることにより該一の鋼矢板の共下がりを防止することを特徴とする。
このように、長ねじを取り付けた鋼矢板をヤットコで地中に圧入すれば、連接された複数の鋼矢板を順次一定深度に圧入することが容易である。また、地上に垂直に突き出た長ねじが上下動をしないように鋼材で固定すれば、地中に圧入した鋼矢板に隣接する鋼矢板を新たに地中に圧入する際に、下向きの力が作用する地中の鋼矢板を所定の引張強度を有する長ねじで支えれば、共下がりを防止することができる。
ここで、上記ヤットコは、上記一の鋼矢板と同じ横断面形状を有し、上記天端に嵌合する嵌合部材が下端に固定された所定長のガイド鋼矢板であって、上記第１工程は、上記一の鋼矢板の天端が所定の深度に配置されるように上記ヤットコを圧入する長さを調整する工程が含まれることが好ましい。
このように地中に圧入する鋼矢板に嵌合しているヤットコの圧入する長さを調整すれば、地中に圧入する鋼矢板の天端の深度を一様にすることができる。
また上記他の一の鋼矢板に対し上記第２工程を行う際に、上記一の鋼矢板から地上に突き出した上記長ねじは、上記鋼材への固定を解放すると共に上記第１ナットとの螺合を解除し、撤去されることが好ましい。
このように地中に既に圧入された鋼矢板に取り付けられた長ねじのうち、これから地中に圧入する鋼矢板の隣りの鋼矢板に取り付けられた長ねじを除外して、他の長ねじを撤去することにすれば、鋼材や長ねじを次の鋼矢板の圧入に使用することができるので、施工費用を抑制することができる。
ここで、上記第１工程における上記第１ナットは、上記一の鋼矢板のウエッブ内面に該一の鋼矢板の圧入方向と中心軸が一致するように溶接することが好ましい。
このように、鋼矢板のウエッブ内面に第１ナットを溶接すれば、圧入機として、例えば株式会社技研製作所の「サイレントパイラー（登録商標）」を使用したとき、チャックでヤットコを構成するガイド鋼矢板のウエッブ両面を把持することができる。また、第１ナットの中心軸が垂直であれば、下向きに作用する力を長ねじで支えるのが容易である。
In the joint falling prevention method of the present invention, a first nut is welded in the vicinity of the top end of one of the connected steel sheet piles, and a predetermined long screw is screwed to the welded first nut. Then, a first step of press-fitting the one steel sheet pile into the ground at a predetermined depth with a yatco fitted to the top end, and the length protruding from the one steel sheet pile press-fitted into the ground to the ground A second step of fixing a screw to a steel material arranged on the ground with a second nut, and when performing the first step on another steel sheet pile adjacent to the one steel sheet pile, A downward force acting on the one steel sheet pile from the other one steel sheet pile is supported by the long screw fixed in the second step, thereby preventing the one steel sheet pile from falling together. .
Thus, if the steel sheet pile to which the long screw is attached is press-fitted into the ground with a Yatco, it is easy to press-fit a plurality of connected steel sheet piles sequentially at a certain depth. In addition, if the long screw protruding perpendicularly to the ground is fixed with steel so that it does not move up and down, when a steel sheet pile adjacent to the steel sheet pile pressed into the ground is newly pressed into the ground, a downward force is applied. If the working steel sheet pile under the ground is supported by a long screw having a predetermined tensile strength, it is possible to prevent the co-falling.
Here, the Yatco is a guide steel sheet pile having a predetermined length having the same cross-sectional shape as the one steel sheet pile, and a fitting member fitted to the top end is fixed to a lower end. It is preferable that the process includes a step of adjusting the length for press-fitting the yatco so that the top end of the one steel sheet pile is arranged at a predetermined depth.
Thus, if the length of the press fit of the steel sheet pile fitted into the ground is adjusted, the depth of the top of the steel sheet pile pressed into the ground can be made uniform.
In addition, when the second step is performed on the other steel sheet pile, the long screw protruding from the one steel sheet pile to the ground releases the fixation to the steel material and is screwed with the first nut. It is preferable that the combination is released and removed.
Of the long screws attached to the steel sheet pile already press-fitted into the ground in this way, excluding the long screw attached to the steel sheet pile adjacent to the steel sheet pile to be pressed into the ground, If it removes, since steel materials and a long screw can be used for press injection of the following steel sheet pile, construction cost can be controlled.
Here, it is preferable that the first nut in the first step is welded to the inner surface of the web of the one steel sheet pile so that the press-fitting direction of the one steel sheet pile coincides with the central axis.
In this way, if the first nut is welded to the inner surface of the steel sheet pile web, when using, for example, “SILENT PILLER (registered trademark)” of Giken Co., Ltd. as a press-fitting machine, a guide steel sheet pile that constitutes a Yatco with a chuck. It is possible to grip both sides of the web. Further, if the central axis of the first nut is vertical, it is easy to support the downwardly acting force with a long screw.
本発明の壁体地中設置工法は、地上に形成された鋼矢板の壁体のうちの一の鋼矢板の天端近傍のウエッブ内面に、該一の鋼矢板の圧入方向と中心軸が一致するように該第１ナットを溶接し、溶接された該第１ナットに所定の長ねじを羅合した後、該天端に嵌合するヤットコで該一の鋼矢板を所定深度の地中に圧入する第１工程と、上記地中に圧入した上記一の鋼矢板から地上に突き出した上記長ねじを、地面に配置された一対のＨ型鋼それぞれで挟持し第２ナットで固定する第２工程と、を有し、上記一の鋼矢板に隣接する他の一の鋼矢板に対して上記第１工程を行う際に該他の一の鋼矢板から該一の鋼矢板に作用する下向きの力を、上記第２工程を行った上記長ねじの反作用で支えることにより上記壁体を非掘削で地中に設置することを特徴とする。
このように、長ねじを取り付けた鋼矢板をヤットコで地中に圧入すれば、壁体を構成する鋼矢板を順次圧入することが容易にできる。また、地上に垂直に突き出た長ねじが上下動しないように鋼材で固定すれば、隣接する鋼矢板を地中に圧入する際に地中の鋼矢板に下向きの力が作用しても、その力を長ねじの引っ張り強度で支えて共下がりを防止することができるので、地中に設置する壁体の天端を面一にすることができる。
ここで、上記ヤットコは、上記一の鋼矢板と同じ横断面形状を有し、上記天端に嵌合する嵌合部材が下端に固定された、所定長のガイド鋼矢板であって、上記第１工程は、上記一の鋼矢板の天端が所定の深度となるように上記ヤットコを圧入する長さを調整する工程が含まれることが好ましい。
このようにヤットコを圧入する長さを調整すれば、壁体を構成する各鋼矢板の天端の深度を調整し、壁体の天端を面一にすることができる。
また、上記他の一の鋼矢板に対し上記第２工程を行う際に、上記一の鋼矢板から地上に突き出した上記長ねじは、上記Ｈ型鋼それぞれによる挟持を解放し、上記第１ナットとの螺合を解除して撤去されることが好ましい。
このように、既に共下がりを防止する役割を果たした長ねじは、Ｈ型鋼それぞれによる挟持を解放し、撤去することにすれば、Ｈ型鋼の所要数や長ねじの所要本数が少なくて済み、施工費用を抑制することができる。
The wall body underground installation method of the present invention is the same as the press-fit direction of the steel sheet pile and the central axis on the inner surface of the web near the top of the steel sheet pile of the steel sheet pile walls formed on the ground. The first nut is welded so that a predetermined long screw is engaged with the welded first nut, and then the one steel sheet pile is brought into the ground at a predetermined depth with a Yatco fitted to the top end. A first step of press-fitting, and a second step of clamping the long screw projecting from the one steel sheet pile press-fitted into the ground with a pair of H-shaped steels arranged on the ground and fixing with a second nut And a downward force acting on the one steel sheet pile from the other one steel sheet pile when performing the first step on the other steel sheet pile adjacent to the one steel sheet pile. The wall body is installed in the ground without excavation by supporting it with the reaction of the long screw in which the second step has been performed. To.
Thus, if the steel sheet pile to which the long screw is attached is press-fitted into the ground with a Yatco, the steel sheet pile constituting the wall body can be easily press-fitted in sequence. Also, if the long screw protruding vertically on the ground is fixed with steel so that it does not move up and down, even if a downward force acts on the steel sheet pile in the ground when pressing the adjacent steel sheet pile into the ground, Since the force can be supported by the tensile strength of the long screw to prevent the joint from falling down, the top end of the wall installed in the ground can be made flush.
Here, the Yatco is a guide steel sheet pile having a predetermined length, having the same cross-sectional shape as the one steel sheet pile, and having a fitting member fitted to the top end fixed to the lower end. Preferably, the first step includes a step of adjusting the length for press-fitting the yatco so that the top end of the one steel sheet pile has a predetermined depth.
Thus, if the length which press-fits a Yatco is adjusted, the depth of the top end of each steel sheet pile which comprises a wall body can be adjusted, and the top end of a wall body can be made flush.
Moreover, when performing the said 2nd process with respect to said another one steel sheet pile, the said long screw protruded on the ground from said one steel sheet pile releases the pinching by each said H-shaped steel, and said 1st nut and It is preferable that the screw is removed and removed.
In this way, long screws that have already played a role in preventing co-falling can be reduced by removing the holding by each H-shaped steel and removing it, so that the required number of H-shaped steel and the required number of long screws can be reduced, Construction costs can be reduced.
本発明の共下がり防止工法によれば、連接する複数の鋼矢板それぞれを地中に圧入したとき、それぞれの鋼矢板の圧入時の深度をそのままの状態で保つことができる。また、本発明の壁体地中設置工法によれば、地面を掘削せずに地中の所定深度に壁体を設置し、かつその天端を面一にすることができる。 According to the co-falling prevention method of the present invention, when each of a plurality of connected steel sheet piles is press-fitted into the ground, the depth at the time of press-fitting of each steel sheet pile can be maintained as it is. Moreover, according to the underground installation method of the wall body of the present invention, the wall body can be installed at a predetermined depth in the ground without excavating the ground, and the top end thereof can be made flush.
以下に、本発明の共下がり防止工法及び壁体地中設置工法の実施形態について図に基づいて説明する。
図１は、本実施形態の共下がり防止工法及び壁体地中設置工法が適用される、連接された複数の鋼矢板の一例、あるいは鋼矢板の壁体の一例を示す図である。
図１に示す連接された複数の鋼矢板１、あるいは鋼矢板１の壁体１０は、液状化防止領域の周囲に４００ｍｍ幅の複数のＵ字形鋼矢板それぞれにおけるウエッブ（凸面）２が互い違いになるように連結し、全長３．５ｍの約６／７が地中に打込まれた状態で形成されている。壁体１０の厚さは、鋼矢板１単体の有効高さの２倍で、相互を連結した継ぎ手４は壁体１０の厚み方向の中央に位置している。
ここで、本実施形態においては、４００ｍｍ幅のＵ字形鋼矢板を用いているが、必ずしも４００ｍｍ幅のものに限定する必要はなく、５００ｍｍ、あるいは６００ｍｍ幅のＵ字形鋼矢板であっても、あるいは有効幅が９００ｍｍのハット形鋼矢板を用いてもよい。なお、ハット形鋼矢板を用いる場合は、同一施工延長での使用枚数が少なくて済む上、継手位置が、一方の最外縁部に配置されるためＵ字形鋼矢板を用いる場合に較べて壁体の厚さを薄くすることができる。なお、長さＬは、３．５ｍのものを用いているが、液状化層と同程度の長さ乃至はそれよりも若干長いものであれば、３．５ｍより長くても、短くてもよい。また、地中に打込む長さは、必ずしも全長Ｌの６／７に限定する必要はない。
鋼矢板全長の例えば約６／７を地中に打込む工法としては、バイブロハンマーをクレーンで吊下げ、振動力を鋼矢板に加えて周辺摩擦力や先端支持力を低減させて地中に慣入させるバイブロ工法、バックホーのアームの先端に取り付けられた油圧駆動のバイブロにより鋼矢板を打設するＬＨＶ工法、高性能のバイブレーターを、伸縮式のリーダーに搭載した杭打機により鋼矢板を打設するＲＧ工法、バックホータイプのベースマシンにリーダーを装着した杭打機を使用し、リーダー内部のチェーン駆動によってアタッチメントを上下させて鋼矢板を無振動・無騒音状態で打設するＦＰ工法、オーガーの削孔機構と鋼矢板の貫入機構を併有し、削孔と同時あるいは削孔後に油圧機構を用いて鋼矢板を押し込むＨＡＳ工法などが用いられる。
Below, embodiment of the joint fall prevention construction method and wall body underground construction method of this invention is described based on figures.
FIG. 1 is a diagram illustrating an example of a plurality of connected steel sheet piles or an example of a wall body of steel sheet piles to which the co-falling prevention method and the wall underground installation method of the present embodiment are applied.
In the connected steel sheet piles 1 shown in FIG. 1 or the wall body 10 of the steel sheet piles 1, the webs (convex surfaces) 2 in the plurality of U-shaped steel sheet piles having a width of 400 mm are staggered around the liquefaction prevention region. And about 6/7 having a total length of 3.5 m is formed in the state of being driven into the ground. The thickness of the wall body 10 is twice the effective height of the steel sheet pile 1 alone, and the joint 4 connecting them is located at the center of the wall body 10 in the thickness direction.
Here, in the present embodiment, a U-shaped steel sheet pile having a width of 400 mm is used, but it is not necessarily limited to a U-shaped steel sheet pile having a width of 400 mm, or a U-shaped steel sheet pile having a width of 500 mm or 600 mm, or A hat-shaped steel sheet pile having an effective width of 900 mm may be used. In addition, when using a hat-shaped steel sheet pile, the number of sheets used in the same construction extension can be reduced, and since the joint position is arranged at one outermost edge, the wall body is used compared to the case of using a U-shaped steel sheet pile. Can be made thinner. The length L is 3.5 m, but may be longer or shorter than 3.5 m as long as it is the same length as the liquefied layer or slightly longer than that. . Further, the length of driving into the ground is not necessarily limited to 6/7 of the total length L.
For example, about 6/7 of the total length of steel sheet piles is driven into the ground by suspending a vibro hammer with a crane and applying vibration force to the steel sheet piles to reduce the peripheral frictional force and tip support force. Vibro construction method, LHV construction method in which steel sheet piles are driven by a hydraulically driven vibro attached to the tip of the backhoe arm, and steel sheet piles are driven by a pile driving machine equipped with a high-performance vibrator on a telescopic leader. RG construction method, FP construction method using a pile driver with a leader mounted on a backhoe type base machine, and driving the steel sheet pile in a vibration-free and noise-free state by moving the attachment up and down by the chain drive inside the leader A HAS method is used in which a drilling mechanism and a steel sheet pile penetration mechanism are provided, and the steel sheet pile is pushed in by using a hydraulic mechanism at the same time as or after drilling.
図２〜図４は、本実施形態の共下がり防止工法及び壁体地中設置工法における第１工程を例示する図であり、図２は、ナットを鋼矢板に溶接した図、図３は、長ねじをナットに螺合した図、図４は、鋼矢板にヤットコを嵌合させて圧入する図である。
図２に例示するように、第１工程は、液状化防止領域の周囲に例えば４００ｍｍ幅の複数のＵ字形鋼矢板それぞれのウエッブ（凸面）２を互い違いにして連接し、全長Ｌの約６／７を地中に打込んで形成された複数の鋼矢板１、あるいは壁体１０のうちの一枚の鋼矢板（本発明の「一の鋼矢板」に相当する。）１の天端近傍に溶接ナット（本発明の「第１ナット」に相当する。）５を溶接する。
ここで、Ｕ字形鋼矢板又はハット形鋼矢板の横断面は、平面を形成するウエッブ２と、ウエッブ２の両側で傾斜面を形成するフランジ３と、継手４とを有し、溶接ナット５は、図２の拡大図（矢印で示された図）に示すように天端近傍のウエッブ２の内面側（凸面の裏面側）に、その中心軸５ａが鋼矢板１の圧入方向Ａと一致するように配置して溶接される。
2-4 is a figure which illustrates the 1st process in the co-fall prevention construction method of this embodiment, and a wall body underground installation construction method, FIG. 2 is the figure which welded the nut to the steel sheet pile, FIG. FIG. 4 is a diagram in which a long screw is screwed into a nut, and FIG.
As illustrated in FIG. 2, in the first step, the webs (convex surfaces) 2 of a plurality of U-shaped steel sheet piles each having a width of 400 mm, for example, are connected alternately around the liquefaction prevention region. In the vicinity of the top end of a plurality of steel sheet piles 1 formed by driving 7 into the ground, or one steel sheet pile (corresponding to “one steel sheet pile” of the present invention) 1 of the wall body 10. A welding nut (corresponding to the “first nut” of the present invention) 5 is welded.
Here, the cross section of the U-shaped steel sheet pile or the hat-shaped steel sheet pile has a web 2 that forms a plane, a flange 3 that forms inclined surfaces on both sides of the web 2, and a joint 4. 2, the central axis 5 a coincides with the press-fitting direction A of the steel sheet pile 1 on the inner surface side (the rear surface side of the convex surface) of the web 2 in the vicinity of the top end as shown in the enlarged view (the diagram indicated by the arrow) in FIG. 2. Are arranged and welded.
次に、図３に例示するように、長ねじ６を鋼矢板１に溶接された溶接ナット５にねじ込む。溶接ナット５は、既に、中心軸が鋼矢板１の圧入方向Ａと一致するように溶接されているので、図３の拡大図（矢印で示された図）に示すように、その溶接ナット５にねじ込まれた長ねじ６は、鋼矢板１の圧入方向Ａに沿って地面に対して垂直に固定される。
本実施形態における長ねじ６は、直径が１６ｍｍから２０ｍｍ、長さが１５０ｍｍから１８０ｍｍで、溶接ナット５に螺合する部分に雄ねじ６ａが刻まれたものを使用しているが、全長に亘って雄ねじ６ａが刻まれたものを使用することもできる。また、長ねじ６の直径及び長さは、鋼矢板１が圧入される地盤の状態や深度、鋼矢板１の長さや継手４の構造などによって任意に選択することができる。
Next, as illustrated in FIG. 3, the long screw 6 is screwed into a welding nut 5 welded to the steel sheet pile 1. Since the welding nut 5 is already welded so that the center axis thereof coincides with the press-fitting direction A of the steel sheet pile 1, as shown in the enlarged view of FIG. 3 (the figure indicated by the arrow), the welding nut 5 The long screw 6 screwed in is fixed perpendicularly to the ground along the press-fitting direction A of the steel sheet pile 1.
The long screw 6 in the present embodiment has a diameter of 16 mm to 20 mm, a length of 150 mm to 180 mm, and uses a portion in which the male screw 6a is engraved on the portion to be screwed into the welding nut 5, but over the entire length. The one in which the male screw 6a is engraved can also be used. Moreover, the diameter and length of the long screw 6 can be arbitrarily selected according to the state and depth of the ground into which the steel sheet pile 1 is press-fitted, the length of the steel sheet pile 1, the structure of the joint 4, and the like.
そして、図４に例示するように、長ねじ６が螺合された状態の鋼矢板１の天端に、ヤットコ２０下部に設けた嵌合部材（図示されていない）２２を嵌合し、圧入機３０のチャック３１でヤットコ２０の主要部のガイド鋼矢板２１を挟んで、ヤットコ２０を所定深度まで圧入する。その場合、地中に壁体１０を形成する鋼矢板１の天端それぞれが面一になるように、ヤットコ２０の圧入長を調整する。なお、ヤットコ２０については図５及び図６に基づいて詳述する。また、圧入機３０には、例えば株式会社技研製作所の「サイレントパイラー（登録商標）」を使用することができる。 Then, as illustrated in FIG. 4, a fitting member (not shown) 22 provided at the lower portion of the yatco 20 is fitted to the top end of the steel sheet pile 1 in a state in which the long screw 6 is screwed, and press-fitted. With the chuck 31 of the machine 30 sandwiching the guide steel sheet pile 21 of the main part of the YATCO 20, the YATCO 20 is press-fitted to a predetermined depth. In that case, the press-fitting length of the yatco 20 is adjusted so that the top ends of the steel sheet piles 1 forming the wall 10 in the ground are flush with each other. The YATCO 20 will be described in detail with reference to FIGS. Further, for example, “Silent Pillar (registered trademark)” of Giken Co., Ltd. can be used as the press-fitting machine 30.
図５及び図６は、本実施形態で使用されるヤットコを例示する図であり、図５は、ヤットコの正面側及び背面側を示す斜視図、図６は、ヤットコの正面及び底面を示す図である。
図５及び図６に示すように、ヤットコ２０は、地中に圧入する鋼矢板１と横断面形状及びそのサイズが同じであり、その長さは、地中に形成される壁体１０の深度よりも長いガイド鋼矢板２１の下端に鋼矢板１に嵌合する嵌合部材２２が固定されている。ここで、本実施形態における嵌合部材２２は、ガイド鋼矢板２１のウエッブ２１ａの両面それぞれに２箇所ずつに溶接された、合計４個の矩形鋼板２２ａによって形成されている。
従って、図６のヤットコ２０の底面に示すように、ウエッブ２１ａの両面それぞれに溶接された矩形鋼板２２ａ相互間の空隙に、長ねじ６が螺合された図４に示す鋼矢板の天端を嵌合させたとき、鋼矢板１は、同じ横断面形状を有するヤットコ２０の底面に当接する。従って、圧入機３０のチャック３１でヤットコ２０のウエッブ両面２１ａを挟み、ヤットコ２０を圧入すれば、地下の所定の深度までその鋼矢板１を圧入することができる。また、ヤットコ２０のガイド鋼矢板２１に目印をつけておき、ヤットコ２０が圧入される長さを地上で監視すれば、鋼矢板１の天端が圧入された深度がわかるので、壁体１０を構成する鋼矢板１それぞれの天端を面一にすることができる。
5 and 6 are diagrams illustrating a yatco used in the present embodiment, FIG. 5 is a perspective view showing the front side and the back side of the yatco, and FIG. 6 is a diagram showing the front and bottom of the yatco. It is.
As shown in FIGS. 5 and 6, the Yatco 20 has the same cross-sectional shape and size as the steel sheet pile 1 that is press-fitted into the ground, and its length is the depth of the wall 10 formed in the ground. The fitting member 22 fitted to the steel sheet pile 1 is fixed to the lower end of the longer guide steel sheet pile 21. Here, the fitting member 22 in the present embodiment is formed by a total of four rectangular steel plates 22a welded to each of the two surfaces of the web 21a of the guide steel sheet pile 21 at two locations.
Therefore, as shown on the bottom surface of the yatco 20 in FIG. 6, the top end of the steel sheet pile shown in FIG. 4 in which the long screw 6 is screwed into the space between the rectangular steel plates 22a welded to both surfaces of the web 21a. When fitted, the steel sheet pile 1 comes into contact with the bottom surface of the yatco 20 having the same cross-sectional shape. Therefore, the steel sheet pile 1 can be press-fitted to a predetermined depth underground by sandwiching the web both surfaces 21a of the yatco 20 with the chuck 31 of the press-fitting machine 30 and press-fitting the yatco 20. Further, if the guide steel sheet pile 21 of the YATCO 20 is marked, and the length of the YATCO 20 press-fitted is monitored on the ground, the depth at which the top end of the steel sheet pile 1 is press-fitted can be known. The top ends of the steel sheet piles 1 to be configured can be flush with each other.
図７は、共下がりを防止する第２工程を例示する図である。
図７に示すように、地面ＧＬに一対のＨ型鋼４０それぞれを鋼矢板１のウエッブ２と直交する方向に配置し、地中に圧入された鋼矢板１から地上に突き出た長ねじ６を一対のＨ型鋼４０で挟む。そして、図７の拡大図（矢印で示された図）に示すように、ナット（本発明の「第２ナット」に相当する。）７とワッシャーでその長ねじ６を一対のＨ型鋼４０に固定する。本実施形態では、長ねじ６を一対のＨ型鋼４０で挟持して固定しているが、必ずしも一対のＨ型鋼４０で挟持する必要はなく、長ねじ６が貫通する程度の穴を設けた型鋼その他の鋼材に固定することができる。
このように長ねじ６が長手方向に移動しないように鋼材で固定しておけば、隣接する鋼矢板１を圧入機３０で圧入する際に下向きの力が作用しても、その長ねじ６の引張強度でその下向きの力を支えることができるので、地中に圧入された鋼矢板１が共下がりするのを防止できる。
FIG. 7 is a diagram illustrating a second step of preventing the co-falling.
As shown in FIG. 7, a pair of H-shaped steels 40 are arranged on the ground GL in a direction orthogonal to the web 2 of the steel sheet pile 1, and a pair of long screws 6 protruding from the steel sheet pile 1 press-fitted into the ground are paired. Between the H-shaped steel 40. Then, as shown in an enlarged view of FIG. 7 (a diagram indicated by an arrow), the long screw 6 is formed into a pair of H-shaped steel 40 with a nut (corresponding to a “second nut” of the present invention) 7 and a washer. Fix it. In this embodiment, the long screw 6 is sandwiched and fixed by a pair of H-shaped steels 40, but it is not always necessary to sandwich the long screws 6 by a pair of H-shaped steels 40, and a shaped steel provided with a hole through which the long screws 6 penetrate. Can be fixed to other steel materials.
Thus, if the long screw 6 is fixed with a steel material so as not to move in the longitudinal direction, even if a downward force is applied when the adjacent steel sheet pile 1 is press-fitted with the press-fitting machine 30, the long screw 6 Since the downward force can be supported by the tensile strength, it is possible to prevent the steel sheet pile 1 press-fitted into the ground from falling together.
図８から図１０は、図７で第２工程を行った鋼矢板に隣接する鋼矢板に第１工程を行うことを例示する図であり、図８は、隣接する鋼矢板にナットを溶接した図、図９は、ナットに長ねじを螺合した図、図１０は、隣接する鋼矢板にヤットコを嵌合させて圧入することを例示する図である。
図８に例示するように、長ねじ６が地上に突き出した鋼矢板（本発明の「一の鋼矢板」に相当する。）１に隣接する鋼矢板（本発明の「他の一の鋼矢板」に相当する。）１の天端近傍のウエッブ２の内面側に溶接ナット（本発明の「第１ナット」に相当する。）５を溶接する。地中に圧入された鋼矢板１とそれに隣接する鋼矢板１とはウエッブ（凸面）２が互い違いに連結されているので、溶接ナット５を溶接するそれぞれの位置は、継手４相互を結ぶラインを挟んで反対側になる。なお溶接ナット５は、図８の拡大図（矢印で示された図）に示すように天端近傍のウエッブ２の内面側に、その中心軸５ａが鋼矢板１の圧入方向Ａと一致するように溶接される。
8-10 is a figure which illustrates performing a 1st process on the steel sheet pile adjacent to the steel sheet pile which performed the 2nd process in FIG. 7, and FIG. 8 welded the nut to the adjacent steel sheet pile. FIGS. 9A and 9B are diagrams in which a long screw is screwed into a nut, and FIGS. 10A and 10B are diagrams illustrating an example in which a Yatco is fitted to an adjacent steel sheet pile and press-fitted.
As illustrated in FIG. 8, a steel sheet pile adjacent to a steel sheet pile (corresponding to “one steel sheet pile” of the present invention) 1 in which the long screw 6 protrudes on the ground (“another steel sheet pile of the present invention”). The welding nut (corresponding to the “first nut” of the present invention) 5 is welded to the inner surface side of the web 2 near the top end of 1. Since the web (convex surface) 2 is alternately connected to the steel sheet pile 1 press-fitted into the ground and the steel sheet pile 1 adjacent thereto, each position where the welding nut 5 is welded is a line connecting the joints 4 to each other. On the opposite side across. The welding nut 5 is arranged so that its central axis 5a coincides with the press-fitting direction A of the steel sheet pile 1 on the inner surface side of the web 2 near the top end as shown in the enlarged view of FIG. Welded to.
図９に例示するように、長ねじ６を、溶接ナット５にねじ込む。溶接ナット５は、既にて中心軸５ａが鋼矢板１の圧入方向と一致するように溶接されているので、その溶接ナット５にねじ込まれた長ねじ６は、鋼矢板１の圧入方向Ａに沿って地面に垂直に固定される。 As illustrated in FIG. 9, the long screw 6 is screwed into the welding nut 5. Since the welding nut 5 has already been welded so that the center shaft 5a coincides with the press-fitting direction of the steel sheet pile 1, the long screw 6 screwed into the welding nut 5 is along the press-fitting direction A of the steel sheet pile 1. Fixed vertically to the ground.
図１０に例示するように、長ねじ６が螺合された状態の鋼矢板１の天端にヤットコ２０を嵌合し、ガイド鋼矢板２１のウエッブ両面を圧入機３０のチャック３１で挟み、ヤットコ２０を所定深度まで圧入する。その場合、鋼矢板１は、既に図７に示した第２工程によって、地中に圧入された鋼矢板１の溶接ナット５に螺合された長ねじ６が一対のＨ型鋼４０で固定されているので、ヤットコ２０を圧入する際に作用する下向きの力は、長ねじ６の引張強度でその下向きの力を支え、地中に圧入された鋼矢板１が共下がりすることがない。 As illustrated in FIG. 10, the Yachco 20 is fitted to the top end of the steel sheet pile 1 in which the long screw 6 is screwed, and both webs of the guide steel sheet pile 21 are sandwiched between chucks 31 of the press-fitting machine 30. 20 is press-fitted to a predetermined depth. In that case, in the steel sheet pile 1, the long screw 6 screwed into the welding nut 5 of the steel sheet pile 1 press-fitted into the ground is fixed by the pair of H-shaped steels 40 in the second step already shown in FIG. Therefore, the downward force that acts when the Yatco 20 is press-fitted supports the downward force with the tensile strength of the long screw 6, and the steel sheet pile 1 that is press-fitted into the ground does not drop together.
図１１及び図１２は、共下がりを防止する第２工程を例示する図であり、図１１は、新たに地中に圧入した鋼矢板から地上に突きだした長ねじをＨ型鋼で固定した図、図１２は、Ｈ型鋼を撤去して地上に突き出たままの長ねじを撤去した図である。
図１１に例示するように、図１０で示したヤットコ２０による圧入の際に共下がり防止に使用した一対のＨ型鋼４０を撤去し、その撤去した一対のＨ型鋼４０で、ヤットコ２０による圧入が終了した鋼矢板１から地上に突き出た長ねじ６を挟み、ナット（本発明の「第２ナット」に相当する。）７とワッシャーでその長ねじ６をＨ型鋼４０に固定する。このとき、一対のＨ型鋼４０を撤去した地中の鋼矢板１からは、長ねじ６が地上に突き出たままの状態になっている。
FIG.11 and FIG.12 is a figure which illustrates the 2nd process which prevents co-falling, and FIG. 11 is the figure which fixed the long screw protruded on the ground from the steel sheet pile newly press-fitted in the ground with H-shaped steel, FIG. 12 is a view in which the long screw that has been protruded to the ground after removing the H-shaped steel is removed.
As illustrated in FIG. 11, the pair of H-shaped steels 40 used for preventing the joint drop at the time of press-fitting by the YATCO 20 shown in FIG. 10 are removed, and the pair of H-shaped steels 40 thus removed can be pressed by the YATCO 20. The long screw 6 protruding from the finished steel sheet pile 1 to the ground is sandwiched, and the long screw 6 is fixed to the H-shaped steel 40 with a nut (corresponding to “second nut” of the present invention) 7 and a washer. At this time, from the underground steel sheet pile 1 from which the pair of H-shaped steels 40 have been removed, the long screws 6 are still protruding from the ground.
図１２に例示するように、図１１において地中の鋼矢板１から地上に突き出たままになっている長ねじ６を、その鋼矢板１から取り外し、溶接ナット５のみが残置される。
ここで、本実施形態では、共下がり防止に使用した一対のＨ型鋼４０は、その都度撤去し、Ｈ型鋼が撤去された長ねじ６も、その都度取り外すので、一対のＨ型鋼４０は、すくなくとも一組、長ねじ６は、最低限２本用意すれば本実施形態の共下がり防止工法及び壁体地中設置工法を行うことができる。しかしながら、一対のＨ型鋼４０は、必ずしもをその都度撤去する必要はなく、また、長ねじ６も、その都度取り外す必要はないので、その場合は一対のＨ型鋼４０を複数組、長ねじ６を３本以上用意する必要がある。
As illustrated in FIG. 12, the long screw 6 that remains protruding from the underground steel sheet pile 1 in FIG. 11 is removed from the steel sheet pile 1, and only the welding nut 5 is left.
Here, in the present embodiment, the pair of H-shaped steels 40 used for preventing the co-falling are removed each time, and the long screw 6 from which the H-shaped steel has been removed is also removed each time. If at least two pairs of long screws 6 are prepared, the joint fall prevention method and the wall body underground installation method of this embodiment can be performed. However, it is not always necessary to remove the pair of H-shaped steels 40 each time, and it is not necessary to remove the long screws 6 each time. In this case, a plurality of pairs of the H-shaped steels 40 and the long screws 6 are removed. It is necessary to prepare three or more.
図１３は、図１２で第２工程を行った鋼矢板に隣接する鋼矢板に第１工程におけるナットの溶接工程を行うことを例示する図である。
第２工程を行った地中の鋼矢板に隣接する鋼矢板１には、第１工程が行われる。ここでは、図８と同様に、隣接する鋼矢板１の天端近傍のウエッブ２の内面側に溶接ナット５を溶接する工程のみを示すが、長ねじ６の螺合工程やヤットコ２０による圧入工程は、図９及び図１０に例示したものと同じであり、図及び説明を省略する。
このように、第１工程と第２工程とを繰り返すことにより、連接された複数の鋼矢板１を順次地中に圧入することや、地面を掘削せずに壁体１０を構成する鋼矢板それぞれの天端が面一となるように地中に順次圧入して壁体を地中に設置することができる。
FIG. 13: is a figure which illustrates performing the welding process of the nut in a 1st process on the steel sheet pile adjacent to the steel sheet pile which performed the 2nd process in FIG.
The 1st process is performed to the steel sheet pile 1 adjacent to the underground steel sheet pile which performed the 2nd process. Here, as in FIG. 8, only the process of welding the welding nut 5 to the inner surface side of the web 2 near the top end of the adjacent steel sheet pile 1 is shown, but the screwing process of the long screw 6 and the press-fitting process by the yatco 20. Are the same as those illustrated in FIG. 9 and FIG.
In this way, by repeating the first step and the second step, each of the steel sheet piles constituting the wall body 10 can be sequentially press-fitted into the ground with a plurality of connected steel sheet piles 1 or without excavating the ground. It is possible to install the wall body in the ground by sequentially press-fitting into the ground so that the top ends of the walls are flush with each other.
連接された複数の鋼矢板を地中に圧入する際の共下がり防止のみならず、地面を掘削することなく地中の任意の深度に大規模な壁体を設置する場合にも活用できる。 It can be used not only for preventing joint falling when a plurality of connected steel sheet piles are press-fitted into the ground, but also when installing a large-scale wall body at an arbitrary depth in the ground without excavating the ground.
１ 鋼矢板
２ ウエッブ
３ フランジ
４ 継手
５ 溶接ナット
５a 中心軸
６ 長ねじ
６a 雄ねじ
７ ナット
１０ 壁体
２０ ヤットコ
２１ ガイド鋼矢板
２１a ウエッブ
２２ 嵌合部材
２２a 矩形鋼板
３０ 圧入機
３１ チャック
４０ Ｈ型鋼
DESCRIPTION OF SYMBOLS 1 Steel sheet pile 2 Web 3 Flange 4 Joint 5 Weld nut 5a Center shaft 6 Long screw 6a Male screw 7 Nut 10 Wall body 20 Yatco 21 Guide steel sheet pile 21a Web 22 Fitting member 22a Rectangular steel plate 30 Press fitting machine 31 Chuck 40 H type steel
Claims (7)
前記地中に圧入された前記一の鋼矢板から地上に突き出した前記長ねじを、地面に配置された鋼材に第２ナットで固定する第２工程と、を有し、
前記一の鋼矢板に隣接する他の一の鋼矢板に対し前記第１工程を行う際に、該他の一の鋼矢板から該一の鋼矢板に作用する下向きの力を前記第２工程で固定した前記長ねじで支えることにより該一の鋼矢板の共下がりを防止することを特徴とする共下がり防止工法。 A first nut is welded near the top end of one of the connected steel sheet piles, and a predetermined long screw is screwed onto the welded first nut, and then fitted to the top end. A first step of press-fitting the one steel sheet pile into the ground at a predetermined depth with
A second step of fixing the long screw projecting to the ground from the one steel sheet pile press-fitted into the ground with a second nut to a steel material disposed on the ground,
When performing the first step on another steel sheet pile adjacent to the one steel sheet pile, a downward force acting on the one steel sheet pile from the other one steel sheet pile in the second step. A co-falling prevention method characterized in that the single steel sheet pile is prevented from co-falling by being supported by the fixed long screw.
前記第１工程は、前記一の鋼矢板の天端が所定の深度に配置されるように前記ヤットコを圧入する長さを調整する工程が含まれることを特徴とする請求項１記載の共下がり防止工法。 The Yatco has the same cross-sectional shape as the one steel sheet pile, and is a guide steel sheet pile having a predetermined length with a fitting member fitted to the top end fixed to the lower end,
The said 1st process includes the process of adjusting the length which press-fits the said Yatco so that the top end of said one steel sheet pile may be arrange | positioned in predetermined depth, The co-falling of Claim 1 characterized by the above-mentioned. Prevention method.
前記地中に圧入した前記一の鋼矢板から地上に突き出した前記長ねじを、地面に配置された一対のＨ型鋼それぞれで挟持し第２ナットで固定する第２工程と、を有し、
前記一の鋼矢板に隣接する他の一の鋼矢板に対して前記第１工程を行う際に該他の一の鋼矢板から該一の鋼矢板に作用する下向きの力を、前記第２工程を行った前記長ねじで支えることにより前記壁体を非掘削で地中に設置することを特徴とする壁体地中設置工法。 The first nut is welded to the inner surface of the web in the vicinity of the top end of one steel sheet pile of the steel sheet pile walls formed on the ground so that the press-fit direction of the one steel sheet pile coincides with the central axis. A first step of press-fitting the one steel sheet pile into the ground at a predetermined depth with a Yatco fitted to the top end after a predetermined long screw is screwed into the first nut,
A second step of clamping the long screw projecting from the one steel sheet pile press-fitted into the ground with a pair of H-shaped steels arranged on the ground and fixing with a second nut,
When performing the first step on another steel sheet pile adjacent to the one steel sheet pile, the downward force acting on the one steel sheet pile from the other one steel sheet pile is the second step. The wall body underground installation method is characterized in that the wall body is installed in the ground without excavation by being supported by the long screw.
前記第１工程は、前記一の鋼矢板の天端が所定の深度となるように前記ヤットコを圧入する長さを調整する工程が含まれることを特徴とする請求項５記載の壁体地中設置工法。 The Yatco is a guide steel sheet pile of a predetermined length having the same cross-sectional shape as the one steel sheet pile, and a fitting member fitted to the top end fixed to the lower end,
6. The wall body ground according to claim 5, wherein the first step includes a step of adjusting a length for press-fitting the yatco so that a top end of the one steel sheet pile has a predetermined depth. Installation method.
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| CN113585260A (en) * | 2021-07-14 | 2021-11-02 | 中交一公局集团有限公司 | Corner pile construction method |
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| JPH0497939U (en) * | 1991-01-09 | 1992-08-25 | ||
| JPH0657737A (en) * | 1992-08-10 | 1994-03-01 | Nkk Corp | Steel sheet pile coupled sinking prevention device |
| JP2005133310A (en) * | 2003-10-28 | 2005-05-26 | Marutoku Kigyo:Kk | Core material erecting method in diaphragm wall construction method |
| JP2014221991A (en) * | 2013-05-14 | 2014-11-27 | Ｊｆｅスチール株式会社 | Steel plank cofferdam structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0497939U (en) * | 1991-01-09 | 1992-08-25 | ||
| JPH0657737A (en) * | 1992-08-10 | 1994-03-01 | Nkk Corp | Steel sheet pile coupled sinking prevention device |
| JP2005133310A (en) * | 2003-10-28 | 2005-05-26 | Marutoku Kigyo:Kk | Core material erecting method in diaphragm wall construction method |
| JP2014221991A (en) * | 2013-05-14 | 2014-11-27 | Ｊｆｅスチール株式会社 | Steel plank cofferdam structure and construction method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113585260A (en) * | 2021-07-14 | 2021-11-02 | 中交一公局集团有限公司 | Corner pile construction method |
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