JP2018084048A - Steel pipe pile, pile head structure, pile type construction, construction method for steel pipe pile, and construction method for pile type construction - Google Patents

Steel pipe pile, pile head structure, pile type construction, construction method for steel pipe pile, and construction method for pile type construction Download PDF

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JP2018084048A
JP2018084048A JP2016226427A JP2016226427A JP2018084048A JP 2018084048 A JP2018084048 A JP 2018084048A JP 2016226427 A JP2016226427 A JP 2016226427A JP 2016226427 A JP2016226427 A JP 2016226427A JP 2018084048 A JP2018084048 A JP 2018084048A
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pile
steel pipe
steel
head structure
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佐藤 光一
Koichi Sato
光一 佐藤
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Nippon Steel Corp
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Nippon Steel and Sumitomo Metal Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a steel pipe pile, pile head structure, pile type construction, etc. whose lamellar tear breakdown-resistant performance and the like are improved for a target such as a harbor construction installed in a coastal water area.SOLUTION: A steel pipe pile 1 to which the present invention is applied is used for a pile type construction 7 installed in a coastal water area and comprises a pile body 5 erected on a water bottom ground 8 and a pile head structure 2 installed on the crown side of the pile body 5. The pile head structure 2 includes a reinforcement anchorage steel plate 3 to which a reinforcement 70 inside an upper concrete 71 supported by the pile body 5 is connected, where a steel pipe made from lamellar tear-resistant steel having a 10% or more contraction value in a plate thickness direction and a 0.010 or less mass% sulfur (S) content is used at least for a junction location at which the reinforcement anchorage steel plate 3 is welded and joined.SELECTED DRAWING: Figure 2

Description

本発明は、沿岸の水域に設けられる杭式構造物の鋼管杭、杭頭構造、杭式構造物、鋼管杭の施工方法、及び杭式構造物の施工方法に関する。   The present invention relates to a steel pipe pile of a pile structure, a pile head structure, a pile structure, a construction method of a steel pipe pile, and a construction method of a pile structure provided in a coastal water area.

従来から、板厚を厚くしたり径を大きくしたりすることなく所定レベルの地震に対する要求性能を満足するものとして、例えば、特許文献1に開示される鋼管杭式桟橋が提案されている。また、運搬・施工が容易であり、なおかつ、動揺を充分抑制できるものとして、例えば、特許文献2に開示される桟橋構造物が提案されている。   Conventionally, for example, a steel pipe pile type jetty disclosed in Patent Document 1 has been proposed as satisfying the required performance for an earthquake of a predetermined level without increasing the plate thickness or increasing the diameter. In addition, for example, a jetty structure disclosed in Patent Document 2 has been proposed as being easy to transport and construct and capable of sufficiently suppressing shaking.

ここで、特許文献1に開示された鋼管杭式桟橋は、海底地盤に根入れされた複数の鋼管杭によって構成される鋼管杭列と、該鋼管杭列における海水面上に突出した部位に構築される上部工とで構成される鋼管杭式桟橋において、前記鋼管杭の直径と前記鋼管杭の全塑性モーメントに対応する曲率とが所定の関係を満足することを特徴とする。   Here, the steel pipe pile type pier disclosed in Patent Document 1 is constructed in a steel pipe pile row constituted by a plurality of steel pipe piles embedded in the seabed ground, and a portion protruding on the sea surface in the steel pipe pile row. In the steel pipe pile type pier constituted by the superstructure, the diameter of the steel pipe pile and the curvature corresponding to the total plastic moment of the steel pipe pile satisfy a predetermined relationship.

また、特許文献2に開示された桟橋構造物は、水底の地盤中にその下端部が打設された複数の杭と、該杭の上端部により支持された上部構造とを備えてなる桟橋式構造物であって、前記杭同士は、前記上部構造と独立した構造とされたフレーム構造体を介して、少なくとも水平方向の相対移動が互いに規制されていることを特徴とする。   Moreover, the pier structure disclosed in Patent Document 2 is a pier type structure including a plurality of piles having lower ends placed in the bottom of the water bottom and an upper structure supported by the upper ends of the piles. It is a structure, Comprising: The said piles are mutually controlled by the relative movement of the horizontal direction at least through the frame structure made into the structure independent of the said upper structure.

特開2015−155645号公報JP2015-155645A 特開平11−264127号公報JP-A-11-264127

一般に、鋼管杭の側面には上部コンクリートに配筋される鉄筋が溶接された鉄筋定着用鋼板が溶接されている。このため、鉄筋に発生した引張力は鉄筋定着用鋼板を介して溶接接合箇所より鋼管杭の側面をその板厚方向に引っ張る力として作用するため、板厚方向の引張力により鋼管杭にラメラティア破壊を発生させることが懸念されていた。   In general, a steel plate for reinforcing steel bars to which reinforcing bars arranged in the upper concrete are welded is welded to the side surface of the steel pipe pile. For this reason, the tensile force generated in the reinforcing bar acts as a force that pulls the side surface of the steel pipe pile in the thickness direction from the welded joint through the steel plate for fixing the reinforcing bar. There was a concern to generate.

ここで、特許文献1に開示された鋼管杭式桟橋は、従来よりも変形性能が高い鋼管杭を用いることで、鋼管杭の板厚を厚くしたり径を大きくしたりすることなく、所定レベルの地震に対する要求性能を満足するとされている。しかし、特許文献1に開示された鋼管杭式桟橋は、各々の鋼管杭に発生し得るラメラティア破壊については考慮されていない。   Here, the steel pipe pile type pier disclosed in Patent Document 1 uses a steel pipe pile having a higher deformation performance than the conventional one, without increasing the thickness of the steel pipe pile or increasing the diameter. It is said that the required performance for earthquakes will be satisfied. However, the steel pipe pile type jetty disclosed in Patent Document 1 does not take into account the lamellar tear that can occur in each steel pipe pile.

また、特許文献2に開示された桟橋構造物は、フレーム構造体が上部構造と独立の構造となっているため、杭同士を固定して構造物に生じる動揺を抑制するにあたって、大規模な剛構造を上部構造の下方に設置する必要がないものとされている。しかし、特許文献2に開示された桟橋構造物も、各々の鋼管杭に発生し得るラメラティア破壊については考慮されておらず、鋼管杭のラメラティア破壊への対策がなされていない。   In the pier structure disclosed in Patent Document 2, since the frame structure is an independent structure from the upper structure, a large-scale rigid body is required to suppress the shaking generated in the structure by fixing the piles together. There is no need to install the structure below the superstructure. However, the pier structure disclosed in Patent Document 2 is not considered for the lamellar damage that may occur in each steel pipe pile, and no measures are taken for the lamellar damage of the steel pipe pile.

そこで、本発明は、上述した問題点に鑑みて案出されたものであって、その目的とするところは、沿岸の水域に設けられる港湾構造物等を対象として、耐ラメラティア破壊性能を向上させた鋼管杭、杭頭構造、杭式構造物、鋼管杭の施工方法、及び杭式構造物の施工方法を提供することにある。   Therefore, the present invention has been devised in view of the above-described problems, and the object of the present invention is to improve the lamellar tear resistance against port structures and the like provided in coastal waters. It is providing the construction method of a steel pipe pile, a pile head structure, a pile type structure, a steel pipe pile, and a pile type structure.

第1発明の鋼管杭は、沿岸の水域に設けられる杭式構造物の鋼管杭であって、水底地盤に立設される杭本体と、前記杭本体の天端側に設けられる杭頭構造とを備え、前記杭頭構造は、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板を有し、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管が、少なくとも前記鉄筋定着用鋼板が溶接接合される接合箇所に用いられることを特徴とする。   The steel pipe pile of the first invention is a steel pipe pile of a pile-type structure provided in a coastal water area, and a pile main body erected on the water bottom ground, and a pile head structure provided on the top end side of the pile main body, The pile head structure includes a steel plate for fixing reinforcing bars to which the internal reinforcing bars of the upper concrete supported by the pile main body are connected, and has a drawing value in the thickness direction of 10% or more and sulfur (S ) A steel pipe made of a lamellar-resistant steel having a content of 0.010% or less in mass% is used at least at a joint where the steel plate for fixing a reinforcing bar is welded.

第2発明の鋼管杭は、第1発明において、前記杭頭構造は、前記杭本体に取り付けられる鋼管を有し、前記鋼管は、前記鉄筋定着用鋼板が溶接接合される接合箇所を包摂し、かつ、前記鉄筋定着用鋼板の板厚以上の範囲に、前記耐ラメラティア鋼からなる鋼管が用いられることを特徴とする。   The steel pipe pile of the second invention is the first invention, wherein the pile head structure includes a steel pipe attached to the pile main body, and the steel pipe includes a joint location where the steel sheet for fixing reinforcing bars is welded, And the steel pipe which consists of the said lamellar-resistant steel is used in the range more than the plate | board thickness of the said steel plate for reinforcement reinforcement.

第3発明の鋼管杭は、第2発明において、前記杭頭構造は、前記鋼管の上端部が、前記上部コンクリートの内部に埋め込まれるとともに、前記杭本体との境界となる前記鋼管の下端部が、前記上部コンクリートの下端面から上方に50mm〜200mmの範囲まで離間させた位置に配置されることを特徴とする。   In the steel pipe pile of the third invention, in the second invention, the upper end portion of the steel pipe is embedded in the upper concrete, and the lower end portion of the steel pipe serving as a boundary with the pile body is provided in the pile head structure. And it arrange | positions in the position spaced apart from the lower end surface of the said upper concrete to the range of 50 mm-200 mm, It is characterized by the above-mentioned.

第4発明の鋼管杭は、第2発明において、前記杭頭構造は、前記鋼管の上端部が、前記上部コンクリートの内部に埋め込まれるとともに、前記杭本体との境界となる前記鋼管の下端部が、前記上部コンクリートの下端面から下方に、前記杭本体の管径の大きさ以上離間させた位置に配置されることを特徴とする。   A steel pipe pile according to a fourth invention is the steel plate pile according to the second invention, wherein the upper end portion of the steel pipe is embedded in the upper concrete and the lower end portion of the steel pipe serving as a boundary with the pile body is provided. The upper concrete is disposed below the lower end surface of the upper concrete at a position spaced apart by a pipe diameter of the pile body or more.

第5発明の鋼管杭は、第2発明において、前記杭頭構造は、前記鋼管の上端部が、前記上部コンクリートの内部に埋め込まれるとともに、前記杭本体との境界となる前記鋼管の下端部が、干潮時水位よりも1m程度下方となる位置に配置されることを特徴とする。   The steel pipe pile of the fifth invention is the steel sheet pile according to the second invention, wherein the upper end of the steel pipe is embedded in the upper concrete and the lower end of the steel pipe serving as a boundary with the pile body is provided. It is arranged at a position about 1 m below the water level at low tide.

第6発明の鋼管杭は、第5発明において、前記杭頭構造は、前記杭本体との境界となる前記鋼管の下端部が、前記杭本体及び前記鋼管とともに被覆防食されることを特徴とする。   The steel pipe pile of the sixth invention is characterized in that, in the fifth invention, the lower end portion of the steel pipe that becomes a boundary with the pile main body is coated and anticorrosive together with the pile main body and the steel pipe. .

第7発明の鋼管杭は、第1発明〜第6発明の何れかにおいて、前記杭頭構造は、高さ方向に延びる縦リブが、前記鋼管又は前記杭本体の側面及び前記鉄筋定着用鋼板に接合されて、前記縦リブは、板厚方向に貫通させた孔部又は切欠部が形成されることを特徴とする。   In the steel pipe pile of the seventh invention, in any one of the first invention to the sixth invention, the pile head structure has a vertical rib extending in a height direction on the side surface of the steel pipe or the pile main body and the steel plate for fixing reinforcing bars. The vertical rib is formed with a hole or a notch penetrating in the thickness direction.

第8発明の鋼管杭は、第1発明〜第7発明の何れかにおいて、前記鉄筋定着用鋼板は、板厚方向に貫通させた孔部又は切欠部が形成されることを特徴とする。   The steel pipe pile according to an eighth aspect of the present invention is characterized in that, in any one of the first to seventh aspects, the steel sheet for fixing a reinforcing bar is formed with a hole or a notch that is penetrated in the thickness direction.

第9発明の鋼管杭は、沿岸の水域に設けられる杭式構造物の鋼管杭であって、水底地盤に立設される杭本体と、前記杭本体の天端側に設けられる杭頭構造とを備え、前記杭頭構造は、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板を有し、高さ方向に延びる縦リブが、前記杭本体の側面及び前記鉄筋定着用鋼板に接合されることを特徴とする。   The steel pipe pile of the ninth invention is a steel pipe pile of a pile-type structure provided in a coastal water area, a pile main body erected on the water bottom ground, and a pile head structure provided on the top end side of the pile main body, The pile head structure includes a steel plate for reinforcing steel bars to which a reinforcing steel inside an upper concrete supported by the pile body is connected, and a vertical rib extending in a height direction includes a side surface of the pile body and the It is characterized by being joined to a steel plate for reinforcing steel bars.

第10発明の鋼管杭は、沿岸の水域に設けられる杭式構造物の鋼管杭であって、水底地盤に立設される杭本体と、前記杭本体の天端側に設けられる杭頭構造とを備え、前記杭頭構造は、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板を有し、前記鉄筋定着用鋼板は、板厚方向に貫通させた孔部又は切欠部が形成されることを特徴とする。   The steel pipe pile of the tenth invention is a steel pipe pile of a pile-type structure provided in a coastal water area, and a pile main body erected on the water bottom ground, and a pile head structure provided on the top end side of the pile main body, The pile head structure has a steel plate for fixing reinforcing bars to which a reinforcing bar inside the upper concrete supported by the pile main body is connected, and the steel plate for fixing reinforcing bars is a hole portion penetrated in the plate thickness direction. Alternatively, a notch is formed.

第11発明の杭頭構造は、沿岸の水域に設けられる杭式構造物の鋼管杭の杭頭構造であって、水底地盤に立設される杭本体の天端側で前記杭本体に取り付けられる鋼管と、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板とを備え、前記鋼管は、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管が、少なくとも前記鉄筋定着用鋼板が溶接接合される接合箇所に用いられることを特徴とする。   The pile head structure of the eleventh invention is a pile head structure of a steel pipe pile of a pile-type structure provided in a coastal water area, and is attached to the pile main body at the top end side of the pile main body standing on the water bottom ground. A steel pipe, and a steel plate for reinforcing steel bars to which a reinforcing steel inside the upper concrete supported by the pile body is connected, the steel pipe having a drawing value of 10% or more in the thickness direction and containing sulfur (S) A steel pipe made of a lamellar-resistant steel having an amount of 0.010% or less in mass% is used at least at a joint location where the steel plate for fixing reinforcing bars is welded.

第12発明の杭式構造物は、沿岸の水域に設けられる杭式構造物であって、水底地盤に立設される複数の杭本体と、前記杭本体の天端側に設けられる杭頭構造と、複数の前記杭本体に支持される上部コンクリートとを備え、前記杭頭構造は、前記杭本体に取り付けられる鋼管と、前記上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板とを有し、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管が、前記鋼管における少なくとも前記鉄筋定着用鋼板が溶接接合される接合箇所に用いられることを特徴とする。   The pile structure of the twelfth invention is a pile structure that is provided in a coastal water area, and a pile head structure that is provided on the top end side of the pile body and a plurality of pile bodies that are erected on the bottom of the water. And a plurality of upper concretes supported by the pile main body, and the pile head structure includes a steel pipe attached to the pile main body and a steel sheet for fixing reinforcing bars to which reinforcing bars inside the upper concrete are connected. And a steel pipe made of lamellar-resistant steel having a drawing value in the plate thickness direction of 10% or more and a sulfur (S) content of 0.010% by mass or less is at least the steel sheet for fixing reinforcing bars in the steel pipe. It is characterized by being used for joints to be welded.

第13発明の鋼管杭の施工方法は、沿岸の水域に設けられる杭式構造物の鋼管杭の施工方法であって、水底地盤に杭本体を立設する立設工程と、前記杭本体の天端側に杭頭構造を設ける接合工程とを備え、前記接合工程では、前記杭頭構造において鉄筋定着用鋼板が溶接接合される接合箇所の鋼管に、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管を用いて、水底地盤に立設された前記杭本体に前記鋼管を取り付けることを特徴とする。   A construction method of a steel pipe pile according to a thirteenth aspect of the invention is a construction method of a steel pipe pile of a pile-type structure provided in a coastal water area, the standing step of standing the pile body on the bottom of the ground, and the top of the pile body. And a joining step of providing a pile head structure on the end side, and in the joining step, a steel pipe at a joining location where a steel plate for reinforcing steel fixing is weld-joined in the pile head structure is 10% or more in the plate thickness direction, And the said steel pipe is attached to the said pile main body erected on the water bottom ground using the steel pipe which consists of a lamellar-resistant steel which made sulfur (S) content 0.010% or less by mass%.

第14発明の杭式構造物の施工方法は、沿岸の水域に設けられる杭式構造物の施工方法であって、水底地盤に複数の杭本体を立設する立設工程と、前記杭本体の天端側に杭頭構造を設ける接合工程と、上部コンクリートの内部に前記杭頭構造を埋め込む埋設工程とを備え、前記接合工程では、前記杭頭構造において鉄筋定着用鋼板が溶接接合される接合箇所の鋼管に、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管を用いて、水底地盤に立設された前記杭本体に前記鋼管を取り付けて、前記埋設工程では、前記鉄筋定着用鋼板に鉄筋を連結してから、前記上部コンクリートとなるコンクリートを打設して、前記上部コンクリートの内部に前記杭頭構造を埋め込むことで、前記上部コンクリートの内部で鉄筋が前記鉄筋定着用鋼板に連結されることを特徴とする。   The construction method of the pile type structure of the fourteenth invention is a construction method of a pile type structure provided in a coastal water area, wherein a standing step of standing a plurality of pile main bodies on the water bottom ground, A joining step in which a pile head structure is provided on the top end side, and a burying step in which the pile head structure is embedded in the upper concrete, and in the joining step, a steel sheet for reinforcing steel fixing is welded in the pile head structure. A steel pipe made of lamellar-resistant steel with a drawing value in the plate thickness direction of 10% or more and a sulfur (S) content of 0.010% or less by mass is used to stand on the bottom of the water. The steel pipe is attached to the pile main body, and in the embedding step, a rebar is connected to the steel plate for fixing reinforcing bars, and then concrete that becomes the upper concrete is placed, and the pile is placed inside the upper concrete. Embedding the head structure In, wherein the reinforcing bars in the interior of the upper concrete is connected to the reinforcing bar fixing steel.

第1発明〜第8発明、第11発明〜第14発明によれば、鉄筋定着用鋼板の接合箇所に耐ラメラティア鋼が用いられるため、杭頭構造の耐ラメラティア破壊性能が向上し、上部コンクリートの内部の鉄筋と鋼管杭の杭頭構造との連結状態が頑強なまま維持され、水域で経年した港湾構造物等においても、高い構造上の安全性を確保することが可能となる。   According to 1st invention-8th invention, 11th invention-14th invention, since the lamellar tear steel is used for the joining location of the steel plate for reinforcing steel bars, the lamellar tear breaking performance of the pile head structure is improved, and the upper concrete The connection state between the internal rebar and the pile head structure of the steel pipe pile is maintained robustly, and it is possible to ensure high structural safety even in harbor structures and the like aged in water.

第2発明によれば、杭本体の全長に高価な耐ラメラティア鋼を用いることなく、鉄筋定着用鋼板の接合箇所の鋼管にのみ重点的に耐ラメラティア鋼を用いることで、耐ラメラティア破壊性能を低コストで向上させることが可能となる。また、この耐ラメラティア鋼において、板厚方向の絞り値及び硫黄(S)含有量を適宜調節することで、要求される水準に合わせて耐ラメラティア破壊性能を調節させることが可能となる。   According to the second invention, without using expensive lamellar-resistant steel for the entire length of the pile body, lamellar-resistant steel is focused only on the steel pipes at the joints of the steel plates for fixing reinforcing bars, thereby reducing the lamellar tear-resistant performance. It can be improved at a cost. Moreover, in this lamellar-resistant steel, it is possible to adjust the lamellar tear-resistant performance to the required level by appropriately adjusting the drawing value in the thickness direction and the sulfur (S) content.

第2発明によれば、スパイラル鋼管等の杭本体に一般的な鋼種が用いられて、耐ラメラティア鋼が全長等に用いられた鋼管を杭本体の天端に取り付けることができるため、この鋼管を杭本体の天端に溶接等するだけの容易な作業で、鉄筋定着用鋼板の接合箇所で杭頭構造の耐ラメラティア破壊性能を向上させることが可能となる。   According to the second invention, a general steel type is used for a pile body such as a spiral steel pipe, and a steel pipe in which lamellar resistant steel is used for the entire length can be attached to the top end of the pile body. It is possible to improve the lamellar tear resistance of the pile head structure at the joint location of the steel plate for fixing the reinforcing bar by an easy operation such as welding to the top end of the pile body.

第3発明によれば、杭本体との境界となる鋼管の下端部が、上部コンクリートの下端面から上方に50mm〜200mmの範囲まで離間させた位置に配置されるため、鉄筋や鉄筋定着用鋼板に対するコンクリートのかぶりが確保され、構造物としての耐久性を担保することが可能となる。   According to the 3rd invention, since the lower end part of the steel pipe used as a boundary with a pile main body is arrange | positioned in the position spaced apart from the lower end surface of the upper concrete to the range of 50 mm-200 mm, it is a steel plate for reinforcing steel bars or reinforcing steel bars. It is possible to ensure the covering of the concrete with respect to the durability of the structure.

第4発明によれば、杭本体との境界となる鋼管の下端部が、上部コンクリートの下端面から下方に杭本体の管径の大きさ以上離間させた位置に配置されるため、鉄筋定着用鋼板に鉄筋が連結されることによる応力集中が上部コンクリートの近傍で発生するものの、杭本体と鋼管との境界が上部コンクリートから十分に離間して応力集中の影響が低減することで、鋼管の脱落等を抑制、防止することが可能となる。   According to the 4th invention, since the lower end part of the steel pipe used as a boundary with a pile main part is arranged in the position spaced apart from the lower end surface of upper concrete below the pipe diameter of a pile main part, it is for reinforcement reinforcement Although stress concentration due to the connection of steel bars to the steel plate occurs in the vicinity of the upper concrete, the boundary between the pile body and the steel pipe is sufficiently separated from the upper concrete and the influence of the stress concentration is reduced. Etc. can be suppressed and prevented.

第5発明、第6発明によれば、杭本体との境界となる鋼管の下端部が、干潮時水位よりも1m程度下方となる位置で、常時海水面下となる位置に配置されて、必要に応じて、鋼管と杭本体との境界が被覆防食層で覆われることで、杭本体と鋼管との境界における腐食による経年劣化、及び漂流物の衝突による損傷等を抑制、防止することが可能となる。   According to 5th invention, 6th invention, the lower end part of the steel pipe used as a boundary with a pile main body is a position which is about 1 m below the water level at the time of low tide, and is always arrange | positioned in the position which is under the sea level, and is required Therefore, the boundary between the steel pipe and the pile body is covered with a coating anti-corrosion layer, so that it is possible to suppress and prevent deterioration due to corrosion at the boundary between the pile body and the steel pipe, and damage caused by the collision of drifting objects. It becomes.

第7発明、第9発明によれば、縦リブが鋼管等の側面及び鉄筋定着用鋼板の上面の両方に接合される場合は、鋼管等の側面に対して鉄筋定着用鋼板の位置決めをした状態で、鉄筋定着用鋼板の開先を鋼管等の側面に完全溶け込み溶接等で溶接接合することができるため、鋼管等の側面に対する鉄筋定着用鋼板の溶接作業を効率的に実施することが可能となる。なお、杭本体の天端に鋼管が取り付けられる場合は、鉄筋定着用鋼板の鋼管の側面に対する溶接作業を工場でも実施することができる。   According to the seventh invention and the ninth invention, when the longitudinal rib is joined to both the side surface of the steel pipe and the upper surface of the steel plate for fixing the reinforcing bar, the steel plate for fixing the reinforcing bar is positioned with respect to the side surface of the steel pipe and the like. Therefore, the groove of the reinforcing steel sheet can be welded and joined to the side surface of the steel pipe or the like by welding, etc., so that it is possible to efficiently carry out the welding work of the reinforcing steel sheet to the side surface of the steel pipe or the like. Become. In addition, when a steel pipe is attached to the top end of a pile main body, the welding operation with respect to the side surface of the steel pipe of the steel plate for reinforcing steel can also be implemented in a factory.

第7発明、第9発明によれば、鋼管等の側面及び鉄筋定着用鋼板の上面の少なくとも何れか一方に縦リブが接合されることで、上部コンクリートの内部に埋め込んだ縦リブとコンクリートとの付着力が付加されるため、大規模地震等にも対応可能な付着力を確保して、鋼管杭に発生する軸方向力を上部コンクリートに十分に伝達することが可能となる。また、縦リブに板厚方向に貫通させた孔部等が形成されることで、縦リブが軽量化するとともに、縦リブとコンクリートとの付着力がジベル効果により向上するため、縦リブの数量を減らせられるほか、上部コンクリートへの軸方向力の伝達をより確実なものとできる。   According to the seventh invention and the ninth invention, the vertical rib is bonded to at least one of the side surface of the steel pipe or the like and the upper surface of the steel plate for fixing reinforcing bars, so that the vertical rib embedded in the upper concrete and the concrete Since the adhesive force is added, it is possible to secure an adhesive force that can cope with a large-scale earthquake and the like and to sufficiently transmit the axial force generated in the steel pipe pile to the upper concrete. In addition, since the vertical ribs are formed with holes or the like penetrated in the thickness direction, the vertical ribs become lighter and the adhesion between the vertical ribs and the concrete is improved by the Gibel effect. In addition, the transmission of axial force to the upper concrete can be made more reliable.

第8発明、第10発明によれば、鉄筋定着用鋼板に板厚方向に貫通させた孔部等が形成されることで、型枠の内部にフレッシュコンクリートを充填するときに、鉄筋定着用鋼板の孔部等を通じて下方から上方に空気が抜けて、鉄筋定着用鋼板の下面側に空気溜まりが形成されないものとなるため、上部コンクリートにおける強度上の欠陥の発生を抑制することが可能となる。   According to the eighth invention and the tenth invention, when a hole or the like penetrated in the thickness direction is formed in the steel sheet for fixing reinforcing bars, the steel sheet for fixing reinforcing bars is used when filling the inside of the mold with fresh concrete. Since air escapes from below to above through the holes of the steel plate and no air pool is formed on the lower surface side of the steel plate for fixing reinforcing bars, it is possible to suppress the occurrence of strength defects in the upper concrete.

第8発明、第10発明によれば、鉄筋定着用鋼板に孔部等が形成されることで、鉄筋定着用鋼板が軽量化するほか、鉄筋定着用鋼板とコンクリートとの付着力がジベル効果により向上して、鉄筋から鉄筋定着用鋼板に伝達される引張力の一部をこの付着力により相殺させて、鋼管等の側面の略直交方向に作用する引張力が低減するため、杭頭構造の耐ラメラティア破壊性能を一段と向上させることが可能となる。   According to the eighth and tenth inventions, by forming holes or the like in the steel plate for fixing reinforcing bars, the weight of the steel plate for fixing reinforcing bars is reduced, and the adhesion between the steel plate for fixing reinforcing bars and the concrete is due to the Gibel effect. As a result, a part of the tensile force transmitted from the reinforcing bar to the reinforcing steel plate is offset by this adhesion force, and the tensile force acting in the direction substantially perpendicular to the side surface of the steel pipe, etc. is reduced. The lamellar tear resistance can be further improved.

第11発明によれば、杭本体の天端に鋼管が取り付けられて設けられるため、鋼管の側面に鉄筋定着用鋼板を工場等で溶接して、鉄筋定着用鋼板が溶接接合された鋼管を現場に搬入してから、杭本体の天端に現場で鋼管を溶接接合等で取り付けることが可能となる。   According to the eleventh invention, since the steel pipe is attached to the top end of the pile body, the steel pipe for reinforcing bar fixing is welded to the side surface of the steel pipe in a factory or the like, and the steel pipe welded and joined to the steel bar for reinforcing steel bar is installed in the field. It is possible to attach a steel pipe to the top end of the pile body by welding or the like at the site after loading.

第12発明〜第14発明によれば、杭本体が回転圧入等により水底地盤に埋め込まれるものの、水底地盤に埋め込まれた杭本体の天端の幅方向及び奥行方向における位置が定まった後、杭本体の天端に後から鋼管を取り付けることができるため、上部コンクリートの内部で鉄筋が配設される方向に合わせて、鉄筋定着用鋼板の幅方向及び奥行方向における位置決めを容易に実施することが可能となる。   According to the twelfth to fourteenth inventions, the pile main body is embedded in the water bottom ground by rotational press-fitting or the like, but after the positions in the width direction and the depth direction of the top end of the pile main body embedded in the water bottom ground are determined, the pile Since a steel pipe can be attached later to the top end of the main body, it is possible to easily carry out positioning in the width direction and depth direction of the steel sheet for fixing reinforcing bars in accordance with the direction in which the reinforcing bars are arranged inside the upper concrete. It becomes possible.

本発明を適用した杭式構造物を示す斜視図である。It is a perspective view which shows the pile type structure to which this invention is applied. 本発明を適用した杭式構造物を示す正面図である。It is a front view showing a pile type structure to which the present invention is applied. 本発明を適用した鋼管杭を示す正面図である。It is a front view which shows the steel pipe pile to which this invention is applied. 本発明を適用した杭頭構造を示す正面図である。It is a front view which shows the pile head structure to which this invention is applied. 本発明を適用した鋼管杭等の鉄筋定着用鋼板を示す平面図である。It is a top view which shows the steel plate for reinforcing steel bars, such as a steel pipe pile to which this invention is applied. (a)は、本発明を適用した鋼管杭等で杭頭構造として耐ラメラティア鋼が用いられた鋼管を示す拡大正面図であり、(b)は、その杭頭構造として耐ラメラティア鋼が用いられた杭本体を示す拡大正面図である。(A) is an enlarged front view showing a steel pipe in which lamellar resistant steel is used as a pile head structure in a steel pipe pile or the like to which the present invention is applied, and (b) is a lamellar resistant steel as the pile head structure. It is an enlarged front view which shows the pile main body. (a)は、本発明を適用した鋼管杭等で上部コンクリートの内部に埋め込まれた鋼管と杭本体との境界を示す正面図であり、(b)は、上部コンクリートの内部から露出した鋼管と杭本体との境界を示す正面図である。(A) is a front view which shows the boundary of the steel pipe embedded in the inside of upper concrete with the steel pipe pile etc. which applied this invention, and a pile main body, (b) is the steel pipe exposed from the inside of the upper concrete, It is a front view which shows the boundary with a pile main body. 本発明を適用した鋼管杭等で干潮時水位よりも1m程度下方となる位置に配置された鋼管と杭本体との境界を示す正面図である。It is a front view which shows the boundary of the steel pipe and pile main body which are arrange | positioned in the steel pipe pile etc. which apply this invention in the position which is about 1 m lower than the water level at the time of low tide. (a)は、本発明を適用した鋼管杭等で縦リブに形成された孔部を示す拡大正面図であり、(b)は、その縦リブに形成された切欠部を示す拡大正面図である。(A) is an enlarged front view which shows the hole formed in the vertical rib by the steel pipe pile etc. which applied this invention, (b) is an enlarged front view which shows the notch part formed in the vertical rib is there. (a)は、本発明を適用した鋼管杭等で鉄筋定着用鋼板に形成された孔部を示す平面図であり、(b)は、その鉄筋定着用鋼板に形成された切欠部を示す平面図である。(A) is a top view which shows the hole formed in the steel plate for reinforcing bar fixation with the steel pipe pile etc. which applied this invention, (b) is a plane which shows the notch part formed in the steel plate for reinforcing bar fixation FIG. (a)は、本発明を適用した鋼管杭等で耐ラメラティア鋼が用いられるか否かにかかわらず鉄筋定着用鋼板に接合された縦リブを示す平面図であり、(b)は、その鉄筋定着用鋼板に形成された孔部又は切欠部を示す平面図である。(A) is a top view which shows the longitudinal rib joined to the steel plate for reinforcing bars irrespective of whether lamellar-resistant steel is used by the steel pipe pile etc. which applied this invention, (b) is the reinforcing bar It is a top view which shows the hole or notch formed in the steel plate for fixing. 本発明を適用した鋼管杭の施工方法を示す正面図である。It is a front view which shows the construction method of the steel pipe pile to which this invention is applied. 本発明を適用した杭式構造物の施工方法における立設工程及び接合工程を示す正面図である。It is a front view which shows the standing-up process and joining process in the construction method of the pile type structure to which this invention is applied. 本発明を適用した杭式構造物の施工方法における埋設工程を示す正面図である。It is a front view which shows the embedding process in the construction method of the pile type structure to which this invention is applied. (a)は、本発明を適用した鋼管杭等で耐ラメラティア破壊性能が向上した状態を示す拡大正面図であり、(b)は、従来の鋼管杭式桟橋等で発生するラメラティア破壊を示す拡大正面図である。(A) is an enlarged front view showing a state in which the lamellar breakage resistance is improved in a steel pipe pile or the like to which the present invention is applied, and (b) is an enlarged view showing a lamellar breakage occurring in a conventional steel pipe pile type jetty or the like. It is a front view. (a)は、本発明を適用した鋼管杭等で縦リブにより上部コンクリートに伝達される軸方向力が向上した状態を示す拡大正面図であり、(b)は、コンクリートを充填するときに空気が抜け易くなる状態を示す拡大正面図である。(A) is an enlarged front view showing a state in which the axial force transmitted to the upper concrete by the vertical rib is improved in a steel pipe pile or the like to which the present invention is applied, and (b) is an air view when filling concrete. It is an enlarged front view which shows the state which becomes easy to come off.

以下、本発明を適用した鋼管杭1、杭頭構造2、杭式構造物7、鋼管杭1の施工方法、及び杭式構造物7の施工方法を実施するための形態について、図面を参照しながら詳細に説明する。   DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Refer to the drawings for forms for implementing a steel pipe pile 1, a pile head structure 2, a pile type structure 7, a steel pipe pile 1 construction method, and a pile type structure 7 construction method to which the present invention is applied. However, it explains in detail.

本発明を適用した杭式構造物7は、図1に示すように、主に、港湾構造物等の杭式桟橋又は橋脚基礎等として、複数の鋼管杭1が水底地盤8にまで根入れした状態で立設されて、複数の鋼管杭1で上部コンクリート71を支持するために用いられる。   As shown in FIG. 1, the pile structure 7 to which the present invention is applied mainly includes a plurality of steel pipe piles 1 as a pile-type pier or a pier foundation such as a harbor structure, and the like. It stands up in a state and is used to support the upper concrete 71 with the plurality of steel pipe piles 1.

本発明を適用した杭式構造物7は、水底地盤8に立設される複数の杭本体5と、杭本体5の天端5a側に設けられる杭頭構造2と、複数の杭本体5に支持されて海水面等の上方に配置される上部コンクリート71とを備え、港湾等の沿岸の水域に設けられる。   The pile structure 7 to which the present invention is applied includes a plurality of pile main bodies 5 erected on the water bottom ground 8, a pile head structure 2 provided on the top end 5 a side of the pile main body 5, and a plurality of pile main bodies 5. The upper concrete 71 is supported and disposed above the sea surface, and is provided in a coastal water area such as a harbor.

上部コンクリート71は、海水面等の上方で複数の鋼管杭1に架設されるコンクリート梁72が設けられる。また、上部コンクリート71は、必要に応じて、鉄筋コンクリート製等の床版73がコンクリート梁72に載置等させて設けられる。   The upper concrete 71 is provided with concrete beams 72 installed on the plurality of steel pipe piles 1 above the sea surface. Further, the upper concrete 71 is provided by placing a floor slab 73 made of reinforced concrete on the concrete beam 72 as necessary.

上部コンクリート71は、図2に示すように、鉄筋コンクリート製又は鉄骨鉄筋コンクリート製等のコンクリート梁72が用いられることで、特に、コンクリート梁72となる上部コンクリート71の内部に、異形鉄筋又は異形棒鋼等の鉄筋70が配設される。   As shown in FIG. 2, the upper concrete 71 is made of a concrete beam 72 made of reinforced concrete or steel reinforced concrete. A reinforcing bar 70 is provided.

上部コンクリート71の内部の鉄筋70は、杭式構造物7の幅方向X又は奥行方向Yに延びて設けられて、幅方向X又は奥行方向Yに隣り合った複数の鋼管杭1の杭頭構造2に連結される。そして、上部コンクリート71の内部の鉄筋70は、各々の鋼管杭1の杭頭構造2に連結されることで、互いに隣り合った複数の鋼管杭1に架設されるものとなる。   The reinforcing bars 70 inside the upper concrete 71 are provided extending in the width direction X or the depth direction Y of the pile structure 7 and are pile head structures of a plurality of steel pipe piles 1 adjacent to each other in the width direction X or the depth direction Y. 2 connected. The rebar 70 inside the upper concrete 71 is connected to the pile head structure 2 of each steel pipe pile 1 so as to be installed on a plurality of adjacent steel pipe piles 1.

本発明を適用した鋼管杭1は、本発明を適用した杭式構造物7の各々の鋼管杭1としても用いられる。そして、本発明を適用した鋼管杭1は、図3に示すように、水底地盤8に立設される杭本体5と、杭本体5の天端5a側に設けられる杭頭構造2とを備える。   The steel pipe pile 1 to which the present invention is applied is also used as each steel pipe pile 1 of the pile-type structure 7 to which the present invention is applied. And the steel pipe pile 1 to which this invention is applied is provided with the pile main body 5 standingly installed in the water bottom ground 8, and the pile head structure 2 provided in the top end 5a side of the pile main body 5, as shown in FIG. .

杭本体5は、主に、幅方向X及び奥行方向Yの管径Dを400mm〜1600mm程度とし、板厚txを6mm〜30mm程度としたスパイラル鋼管が用いられる。杭本体5は、天端5aから下端5bまで高さ方向Zに延びて設けられて、海水面側に天端5aが配置されるとともに、水底地盤8内に下端5bが埋め込まれて配置される。   The pile body 5 is mainly a spiral steel pipe having a pipe diameter D in the width direction X and a depth direction Y of about 400 mm to 1600 mm and a plate thickness tx of about 6 mm to 30 mm. The pile body 5 is provided so as to extend in the height direction Z from the top end 5a to the lower end 5b. The top end 5a is disposed on the seawater surface side, and the lower end 5b is embedded in the bottom bottom ground 8. .

杭頭構造2は、図4に示すように、杭本体5に支持される上部コンクリート71の内部に埋め込まれる。そして、杭頭構造2は、上部コンクリート71の内部の鉄筋70が連結される鉄筋定着用鋼板3を有する。また、杭頭構造2は、必要に応じて、杭本体5の天端5aに取り付けられる鋼管4をさらに有する。   As shown in FIG. 4, the pile head structure 2 is embedded in the upper concrete 71 supported by the pile body 5. And the pile head structure 2 has the steel plate 3 for reinforcement fixing to which the reinforcement 70 inside the upper concrete 71 is connected. Moreover, the pile head structure 2 further has the steel pipe 4 attached to the top end 5a of the pile main body 5 as needed.

鉄筋定着用鋼板3は、主に、高さ方向Zの板厚tzを9mm〜12mm程度とした鋼板が用いられる。そして、鉄筋定着用鋼板3は、上部コンクリート71の内部に配設された1又は複数の鉄筋70の端部が、鉄筋定着用鋼板3の上面3aに当接等させた状態で溶接接合されることで、上部コンクリート71の内部の鉄筋70が連結されるものとなる。   As the steel plate 3 for fixing reinforcing bars, a steel plate having a plate thickness tz in the height direction Z of about 9 mm to 12 mm is mainly used. The reinforcing steel plate 3 is welded and joined with the end portions of one or more reinforcing bars 70 disposed in the upper concrete 71 in contact with the upper surface 3 a of the reinforcing steel plate 3. Thus, the reinforcing bars 70 inside the upper concrete 71 are connected.

鉄筋定着用鋼板3は、図5(a)に示すように、所定の鋼管杭1に対して幅方向X及び奥行方向Yの四方向にコンクリート梁72が架設される場合は、主に、鋼管杭1の外周に沿って全周の4箇所に設けられる。また、鉄筋定着用鋼板3は、図5(b)に示すように、所定の鋼管杭1に対して幅方向X及び奥行方向Yの二方向にコンクリート梁72が架設される場合は、主に、鋼管杭1の外周に沿って半周の2箇所に設けられる。   As shown in FIG. 5 (a), the steel plate 3 for reinforcing steel bars is mainly formed by a steel pipe when concrete beams 72 are laid on the predetermined steel pipe pile 1 in four directions of the width direction X and the depth direction Y. It is provided along the outer periphery of the pile 1 at four locations on the entire periphery. Further, as shown in FIG. 5 (b), the steel plate 3 for reinforcing steel bars is mainly used when a concrete beam 72 is installed in two directions of the width direction X and the depth direction Y with respect to a predetermined steel pipe pile 1. The steel pipe pile 1 is provided at two locations along the outer circumference of the steel pipe pile 1.

なお、鉄筋定着用鋼板3は、三方向にコンクリート梁72が架設される場合は、鋼管杭1の外周に沿って3箇所に設けられてもよく、一方向にコンクリート梁72が架設される場合は、鋼管杭1の外周に沿って1箇所に設けられてもよい。また、鉄筋定着用鋼板3は、鋼管杭1の外周に沿って複数箇所に分断させて設けられるほか、1枚の鋼板等が鋼管杭1の外周に沿って溶接接合されて、複数箇所に分断させることなく設けられてもよい。   In the case where the concrete beam 72 is erected in three directions, the reinforcing steel plate 3 may be provided at three locations along the outer periphery of the steel pipe pile 1 or when the concrete beam 72 is erected in one direction. May be provided at one location along the outer periphery of the steel pipe pile 1. In addition, the steel plate 3 for fixing reinforcing bars is divided into a plurality of locations along the outer periphery of the steel pipe pile 1, and a single steel plate or the like is welded along the outer periphery of the steel tube pile 1 to be divided into a plurality of locations. It may be provided without making it.

杭頭構造2は、図6に示すように、鋼管4又は杭本体5の側面2aに、鉄筋定着用鋼板3が溶接接合される。このとき、杭頭構造2は、少なくとも鉄筋定着用鋼板3が溶接接合される接合箇所Jに、板厚方向の絞り値を所定値とし、かつ、硫黄(S)含有量を質量%で所定値とした耐ラメラティア鋼6からなる鋼管が用いられる。   As shown in FIG. 6, the pile head structure 2 is formed by welding a reinforcing steel plate 3 to a side surface 2 a of a steel pipe 4 or a pile body 5 by welding. At this time, the pile head structure 2 has a drawing value in the plate thickness direction as a predetermined value and a sulfur (S) content in mass% as a predetermined value at least at a joint J where the reinforcing steel plate 3 is welded. A steel pipe made of the lamellar resistant steel 6 is used.

杭頭構造2は、例えば、鋼管杭1の外周に沿って略全周に鉄筋定着用鋼板3が溶接接合される場合等は、鋼管4又は杭本体5の略全周に亘って耐ラメラティア鋼6が用いられる。また、杭頭構造2は、鋼管杭1の外周の一部に鉄筋定着用鋼板3が溶接接合される場合は、鋼管4又は杭本体5の外周の一部にのみ耐ラメラティア鋼6が用いられてもよい。   The pile head structure 2 is made of, for example, a lamellar-resistant steel that extends around the entire circumference of the steel pipe 4 or the pile body 5 when the steel plate 3 for reinforcing steel bars is welded and joined to the entire circumference along the outer circumference of the steel pipe pile 1. 6 is used. In addition, when the steel plate 3 for reinforcing steel bars is welded to a part of the outer periphery of the steel pipe pile 1, the pile head structure 2 uses the lamellar-resistant steel 6 only on a part of the outer periphery of the steel pipe 4 or the pile body 5. May be.

耐ラメラティア鋼6は、板厚方向の絞り値を10%以上とし、かつ、硫黄(S)含有量を質量%で0.010%以下とした鋼材とする。また、耐ラメラティア鋼6は、板厚方向の絞り値を15%以上、かつ、硫黄(S)含有量を質量%で0.008%以下とすることが望ましく、板厚方向の絞り値を25%以上、かつ、硫黄(S)含有量を質量%で0.006%以下とすることがより望ましい。ここで、板厚方向の絞り値及び硫黄(S)含有量の定義は、JIS G 3199(2013)に準拠するものとする。   The lamellar resistant steel 6 is a steel material having a drawing value in the thickness direction of 10% or more and a sulfur (S) content of 0.010% or less by mass%. Further, the lamellar resistant steel 6 desirably has a drawing value in the plate thickness direction of 15% or more and a sulfur (S) content of 0.008% or less in mass%, and has a drawing value in the plate thickness direction of 25. % And more preferably the sulfur (S) content is 0.006% or less by mass%. Here, the definition of the drawing value in the plate thickness direction and the sulfur (S) content shall conform to JIS G 3199 (2013).

杭頭構造2は、主に、図6(a)に示すように、杭本体5の天端5aに取り付けられる鋼管4において、鉄筋定着用鋼板3の接合箇所Jとそれ以外の部分とで鋼種を異ならせることなく、鋼管4の高さ方向Zの全長に耐ラメラティア鋼6が用いられる。杭頭構造2は、必要に応じて、鉄筋定着用鋼板3の接合箇所Jとそれ以外の部分とで鋼種を異ならせて、鋼管4の高さ方向Zの一部分にのみ耐ラメラティア鋼6が用いられてもよい。   As shown in FIG. 6 (a), the pile head structure 2 is mainly composed of a steel pipe 4 attached to the top end 5a of the pile body 5 with a joint J of the reinforcing steel plate 3 and other portions. The lamellar resistant steel 6 is used for the entire length in the height direction Z of the steel pipe 4 without making the difference. The pile head structure 2 uses the lamellar steel 6 only at a part in the height direction Z of the steel pipe 4 by changing the steel type at the joint J of the reinforcing steel plate 3 and other parts as needed. May be.

鋼管4は、鉄筋定着用鋼板3が溶接接合される接合箇所Jを包摂し、かつ、鉄筋定着用鋼板3の板厚tz以上の範囲Rに、耐ラメラティア鋼6が用いられる。このとき、鋼管4は、例えば、高さ方向Zの全長の一部又は全部に耐ラメラティア鋼6が用いられることで、少なくとも鉄筋定着用鋼板3の接合箇所J、及び接合箇所Jから上方及び下方の各々に50mm程度までの範囲Rに、耐ラメラティア鋼6が用いられる。   The steel pipe 4 includes the joint J where the reinforcing steel plate 3 is welded and the lamellar steel 6 is used in a range R equal to or greater than the thickness tz of the reinforcing steel plate 3. At this time, for example, the lamellar-resistant steel 6 is used for part or all of the entire length in the height direction Z of the steel pipe 4, so that at least the joint J of the reinforcing steel plate 3 and the upper and lower sides from the joint J The lamellar-resistant steel 6 is used in a range R up to about 50 mm.

杭頭構造2は、図6(b)に示すように、スパイラル鋼管等の杭本体5において、鉄筋定着用鋼板3の接合箇所Jとそれ以外の部分とで鋼種を異ならせて、杭本体5の高さ方向Zの一部分にのみ耐ラメラティア鋼6が用いられてもよい。なお、杭頭構造2は、必要に応じて、鉄筋定着用鋼板3の接合箇所Jとそれ以外の部分とで鋼種を異ならせることなく、杭本体5の高さ方向Zの全長に耐ラメラティア鋼6が用いられてもよい。   As shown in FIG. 6 (b), the pile head structure 2 has a pile main body 5 such as a spiral steel pipe in which the steel type is different between the joint J of the reinforcing steel plate 3 and other portions. The lamellar resistant steel 6 may be used only in a part in the height direction Z of the steel plate. In addition, the pile head structure 2 is made of lamellar-resistant steel to the entire length in the height direction Z of the pile body 5 without changing the steel type at the joint J of the reinforcing steel plate 3 and other portions as necessary. 6 may be used.

杭頭構造2は、杭本体5の高さ方向Zの一部分にのみ耐ラメラティア鋼6が用いられる場合に、鉄筋定着用鋼板3が溶接接合される接合箇所Jを包摂し、かつ、鉄筋定着用鋼板3の板厚tz以上の範囲Rに、耐ラメラティア鋼6が用いられる。このとき、杭頭構造2は、例えば、鉄筋定着用鋼板3の接合箇所J、及び接合箇所Jから上方及び下方の各々に50mm程度までの範囲Rの杭本体5に、耐ラメラティア鋼6が用いられる。   The pile head structure 2 includes the joint J where the reinforcing steel plate 3 is welded and joined when the lamellar resistant steel 6 is used only in a part of the pile body 5 in the height direction Z, and for fixing the reinforcing bar. The lamellar resistant steel 6 is used in a range R equal to or greater than the plate thickness tz of the steel plate 3. At this time, the pile head structure 2 uses, for example, a lamellar tear resistant steel 6 for the joint body J of the steel plate 3 for fixing reinforcing bars and the pile body 5 in the range R up to about 50 mm above and below the joint part J. It is done.

本発明を適用した杭頭構造2は、図4に示すように、本発明を適用した鋼管杭1の杭頭構造2としても用いられて、杭本体5の天端5a側で杭本体5に取り付けられる鋼管4と、上部コンクリート71の内部の鉄筋70が連結される鉄筋定着用鋼板3とを備える。   As shown in FIG. 4, the pile head structure 2 to which the present invention is applied is also used as the pile head structure 2 of the steel pipe pile 1 to which the present invention is applied. The steel pipe 4 to be attached and the steel sheet 3 for fixing reinforcing bars to which the reinforcing bars 70 in the upper concrete 71 are connected are provided.

鋼管4は、主に、杭本体5と同程度の管径D及び板厚txとした板巻鋼管が用いられて、高さ方向Zの上端部4aが、上部コンクリート71の内部に埋め込まれる。また、鋼管4は、高さ方向Zの下端部4bが、杭本体5の天端5aに溶接接合で取り付けられることで、鋼管4の下端部4b及び杭本体5の天端5aが、鋼管4と杭本体5との境界となる。   As the steel pipe 4, a sheet-wound steel pipe having a pipe diameter D and a plate thickness tx comparable to those of the pile body 5 is mainly used, and the upper end portion 4 a in the height direction Z is embedded in the upper concrete 71. Moreover, the steel pipe 4 has the lower end part 4b of the height direction Z attached to the top end 5a of the pile main body 5 by welding joining, and the bottom end part 4b of the steel pipe 4 and the top end 5a of the pile main body 5 are the steel pipe 4 It becomes a boundary with the pile main body 5.

杭頭構造2は、図7、図8に示すように、杭本体5の天端5aに鋼管4が取り付けられることで、鋼管4の上端部4aが、上部コンクリート71の内部に埋め込まれるとともに、鋼管4と杭本体5との境界となる鋼管4の下端部4bが、所定の位置に配置される。   As shown in FIGS. 7 and 8, the pile head structure 2 has the steel pipe 4 attached to the top end 5 a of the pile body 5 so that the upper end portion 4 a of the steel pipe 4 is embedded in the upper concrete 71. A lower end portion 4b of the steel pipe 4 serving as a boundary between the steel pipe 4 and the pile body 5 is disposed at a predetermined position.

杭頭構造2は、図7(a)に示すように、杭本体5との境界となる鋼管4の下端部4bが、上部コンクリート71の下端面71aから上方に50mm以上離間させた位置に配置されてもよい。このとき、杭頭構造2は、鋼管4と杭本体5との境界が上部コンクリート71の内部に埋め込まれて、主に、上部コンクリート71の下端面71aから上方に50mm〜200mmの範囲まで離間させた位置に鋼管4の下端部4bが配置される。   As shown in FIG. 7A, the pile head structure 2 is disposed at a position where the lower end portion 4 b of the steel pipe 4 that becomes the boundary with the pile body 5 is separated from the lower end surface 71 a of the upper concrete 71 by 50 mm or more upward. May be. At this time, the pile head structure 2 is such that the boundary between the steel pipe 4 and the pile main body 5 is embedded in the upper concrete 71 and is mainly spaced apart from the lower end surface 71a of the upper concrete 71 to a range of 50 mm to 200 mm. The lower end 4b of the steel pipe 4 is disposed at the position.

杭頭構造2は、図7(b)に示すように、杭本体5との境界となる鋼管4の下端部4bが、上部コンクリート71の下端面71aから下方に杭本体5の管径Dの大きさ以上離間させた位置に配置されてもよい。このとき、杭頭構造2は、鋼管4と杭本体5との境界が上部コンクリート71の下端面71aから下方に露出して、主に、上部コンクリート71の下端面71aから下方にD〜2D程度の位置に鋼管4の下端部4bが配置される。   As shown in FIG. 7 (b), the pile head structure 2 has a lower end 4 b of the steel pipe 4 serving as a boundary with the pile main body 5, and a pipe diameter D of the pile main body 5 downward from the lower end surface 71 a of the upper concrete 71. You may arrange | position in the position spaced apart from the magnitude | size. At this time, in the pile head structure 2, the boundary between the steel pipe 4 and the pile body 5 is exposed downward from the lower end surface 71 a of the upper concrete 71, and is mainly about D to 2D downward from the lower end surface 71 a of the upper concrete 71. The lower end portion 4b of the steel pipe 4 is disposed at the position.

杭頭構造2は、図8(a)に示すように、杭本体5との境界となる鋼管4の下端部4bが、干潮時水位LWLよりも1m程度下方となる位置で、常時海水面下となる位置に配置されてもよい。このとき、杭頭構造2は、鋼管4と杭本体5との境界が上部コンクリート71の下端面71aから下方に露出して、主に、干潮時水位LWLよりも下方に0.9m〜1.1mの位置に鋼管4の下端部4bが配置される。   As shown in FIG. 8 (a), the pile head structure 2 is such that the lower end 4b of the steel pipe 4 serving as the boundary with the pile body 5 is at a position approximately 1 m below the low tide level LWL and is always below the sea level. It may be arranged at a position. At this time, in the pile head structure 2, the boundary between the steel pipe 4 and the pile main body 5 is exposed downward from the lower end surface 71 a of the upper concrete 71, and mainly 0.9 m to 1.m below the low tide level LWL. The lower end 4b of the steel pipe 4 is arranged at a position of 1 m.

杭頭構造2は、図8(b)に示すように、杭本体5との境界となる鋼管4の下端部4bが、干潮時水位LWLよりも1m程度下方となる位置に配置される場合に、杭本体5及び鋼管4とともに被覆防食されてもよい。このとき、杭頭構造2は、鋼管4と杭本体5との境界が上部コンクリート71の下端面71aから下方に露出するものの、鋼管4と杭本体5との境界が被覆防食層11で覆われるものとなる。   When the pile head structure 2 is disposed at a position where the lower end portion 4b of the steel pipe 4 serving as the boundary with the pile main body 5 is about 1 m below the low tide level LWL, as shown in FIG. 8 (b). The pile body 5 and the steel pipe 4 may be covered and protected against corrosion. At this time, in the pile head structure 2, the boundary between the steel pipe 4 and the pile main body 5 is exposed downward from the lower end surface 71 a of the upper concrete 71, but the boundary between the steel pipe 4 and the pile main body 5 is covered with the coating anticorrosion layer 11. It will be a thing.

被覆防食層11は、エポキシ樹脂又はウレタン樹脂等の高分子系防食材を用いた重防食塗覆層で形成されて、又は、重層構造のペトロラタム系被覆防食層等で形成される。このとき、ペトロラタム系被覆防食層は、鋼管4及び杭本体5の表面に隣接し1層目の内側層となるペトロラタム系防食材層、ペトロラタム系防食材層に隣接し2層目の中間層となる緩衝層、及び緩衝層に隣接し3層目の外側層となる防護層等を有した重層構造となる。   The coated anticorrosive layer 11 is formed of a heavy anticorrosive coating layer using a polymer anticorrosive material such as an epoxy resin or a urethane resin, or a petrolatum coated anticorrosive layer having a multilayer structure. At this time, the petrolatum-based coated anticorrosion layer is adjacent to the steel pipe 4 and the surface of the pile body 5 and is a petrolatum-based anticorrosion material layer that is the first inner layer, adjacent to the petrolatum-based anticorrosion material layer, and a second intermediate layer And a protective layer that is adjacent to the buffer layer and serves as a third outer layer adjacent to the buffer layer.

なお、ペトロラタム系防食材層は、主に、ペトロラタムペースト又はペトロラタム含浸テープ等が用いられる。また、緩衝層は、発泡ウレタン又は発泡ポリエチレン等が用いられる。そして、防護層は、繊維強化プラスチック(FRP)、高耐食性ステンレスを含むステンレス、チタン、鋼材、又はFRPの外側にチタンを配置したもの等が用いられる。   The petrolatum-based anticorrosive material layer is mainly made of a petrolatum paste or a petrolatum-impregnated tape. The buffer layer is made of foamed urethane or foamed polyethylene. As the protective layer, fiber reinforced plastic (FRP), stainless steel including high corrosion resistance stainless steel, titanium, a steel material, or a material in which titanium is disposed outside the FRP is used.

被覆防食層11よりも下方の杭本体5には、必要に応じて、電気防食が施される。このとき、被覆防食層11よりも下方の杭本体5には、例えば、鋼(鉄)よりもイオン化傾向の大きなアルミ、亜鉛又はアルミと亜鉛との合金等の通電性部材が杭本体5に配設されることで、海水面下の杭本体5に電気防食が施されるものとなる。   The pile body 5 below the coated anticorrosion layer 11 is subjected to electrocorrosion protection as necessary. At this time, a conductive member such as aluminum, zinc, or an alloy of aluminum and zinc, which has a higher ionization tendency than steel (iron), is disposed on the pile body 5 below the anticorrosion layer 11. By being provided, the anticorrosion is applied to the pile body 5 below the sea level.

杭頭構造2は、図9に示すように、高さ方向Zに延びる鋼板等の縦リブ21が、鋼管4の側面2a及び鉄筋定着用鋼板3の上面3aの何れか一方又は両方に、溶接接合等で接合される。縦リブ21は、例えば、高さ寸法hを20cm程度とする。そして、縦リブ21は、鋼管4の側面2aには仮付け溶接等で接合されるとともに、鉄筋定着用鋼板3の上面3aには完全溶け込み溶接等で接合されるものとなる。   As shown in FIG. 9, the pile head structure 2 has a longitudinal rib 21 such as a steel plate extending in the height direction Z welded to either one or both of the side surface 2 a of the steel pipe 4 and the upper surface 3 a of the steel plate 3 for reinforcing steel bars. Joined by joining or the like. For example, the vertical rib 21 has a height dimension h of about 20 cm. The vertical ribs 21 are joined to the side surface 2a of the steel pipe 4 by tack welding or the like, and are joined to the upper surface 3a of the reinforcing steel plate 3 by full penetration welding or the like.

縦リブ21は、必要に応じて、板厚方向に貫通させた1又は複数の孔部30又は切欠部31が形成される。このとき、縦リブ21は、図9(a)に示すように、例えば、内径を5cm程度とした略真円形状の開口が形成されて、複数の孔部30が高さ方向Zに並べて配置される。また、縦リブ21は、図9(b)に示すように、例えば、鋼管4の側面2aに近接させた部分が切り欠かれて、複数の切欠部31が高さ方向Zに並べて配置される。   The vertical rib 21 is formed with one or a plurality of holes 30 or notches 31 penetrating in the thickness direction as necessary. At this time, as shown in FIG. 9A, the vertical rib 21 is formed with a substantially circular opening having an inner diameter of about 5 cm, for example, and the plurality of hole portions 30 are arranged in the height direction Z. Is done. Moreover, as shown in FIG.9 (b), the vertical rib 21 is notched in the part which adjoined the side surface 2a of the steel pipe 4, for example, and the some notch part 31 is arranged in the height direction Z. .

鉄筋定着用鋼板3にも、図10に示すように、必要に応じて、板厚方向に貫通させた1又は複数の孔部30又は切欠部31が形成されてもよい。このとき、鉄筋定着用鋼板3は、図10(a)に示すように、例えば、内径を5cm程度とした略真円形状の開口が形成されて、複数の孔部30が鋼管杭1の外周に沿って並べて配置される。また、鉄筋定着用鋼板3は、図10(b)に示すように、例えば、鋼管4等の側面2aに近接させた部分が切り欠かれて、複数の切欠部31が鋼管杭1の外周に沿って並べて配置される。   As shown in FIG. 10, the reinforcing steel plate 3 may also be provided with one or a plurality of holes 30 or notches 31 that are penetrated in the thickness direction as necessary. At this time, as shown in FIG. 10 (a), the steel plate 3 for reinforcing steel bars is formed with, for example, a substantially circular opening having an inner diameter of about 5 cm, and the plurality of holes 30 are formed on the outer periphery of the steel pipe pile 1. Are arranged side by side. Further, as shown in FIG. 10 (b), the steel plate 3 for reinforcing steel bars is cut out, for example, at a portion close to the side surface 2 a of the steel pipe 4 or the like, and a plurality of cutout portions 31 are formed on the outer periphery of the steel pipe pile 1. Are arranged side by side.

本発明を適用した鋼管杭1は、図9、図10に示すように、主に、耐ラメラティア鋼6が用いられた鋼管4を有する杭頭構造2を備える。そして、本発明を適用した鋼管杭1は、耐ラメラティア鋼6が用いられた鋼管4又は杭本体5の側面2aに、孔部30又は切欠部31が形成等された縦リブ21又は鉄筋定着用鋼板3が溶接接合等で接合される。   As shown in FIGS. 9 and 10, the steel pipe pile 1 to which the present invention is applied mainly includes a pile head structure 2 having a steel pipe 4 in which lamellar resistant steel 6 is used. And the steel pipe pile 1 to which this invention is applied is the vertical rib 21 by which the hole part 30 or the notch part 31 was formed etc. in the side surface 2a of the steel pipe 4 or the pile main body 5 in which the lamellar-resistant steel 6 was used, or for reinforcement reinforcement The steel plate 3 is joined by welding joining or the like.

本発明を適用した鋼管杭1は、これに限らず、耐ラメラティア鋼6が用いられた鋼管4を有しない杭頭構造2を備えるものであってもよい。このとき、本発明を適用した鋼管杭1は、図11に示すように、鉄筋定着用鋼板3を有する杭頭構造2と杭本体5とを備えるものの、杭頭構造2及び杭本体5に耐ラメラティア鋼6が用いられることなく、鉄筋定着用鋼板3が杭本体5の側面2aに溶接接合される。   The steel pipe pile 1 to which the present invention is applied is not limited to this, and may include a pile head structure 2 that does not have the steel pipe 4 in which the lamellar resistant steel 6 is used. At this time, as shown in FIG. 11, the steel pipe pile 1 to which the present invention is applied includes a pile head structure 2 having a steel plate 3 for fixing reinforcing bars and a pile body 5, but is resistant to the pile head structure 2 and the pile body 5. The reinforcing steel plate 3 is welded to the side surface 2 a of the pile body 5 without using the lamellar steel 6.

本発明を適用した鋼管杭1は、耐ラメラティア鋼6が用いられない場合でも、図11(a)に示すように、高さ方向Zに延びる縦リブ21が、杭本体5の側面2a及び鉄筋定着用鋼板3の上面3aの何れか一方又は両方に、溶接接合等で接合される。そして、本発明を適用した鋼管杭1は、必要に応じて、図9に示す縦リブ21と同様に、板厚方向に貫通させた孔部30又は切欠部31が、縦リブ21に形成されるものとなる。また、本発明を適用した鋼管杭1は、耐ラメラティア鋼6が用いられない場合でも、図11(b)に示すように、必要に応じて、図10に示す鉄筋定着用鋼板3と同様に、板厚方向に貫通させた孔部30又は切欠部31が、鉄筋定着用鋼板3に形成されるものとなる。   Even when the lamellar steel 6 is not used, the steel pipe pile 1 to which the present invention is applied has the vertical ribs 21 extending in the height direction Z, as shown in FIG. It joins to either one or both of the upper surfaces 3a of the fixing steel plate 3 by welding or the like. And as for the steel pipe pile 1 to which this invention is applied, the hole 30 or the notch 31 penetrated in the plate | board thickness direction is formed in the vertical rib 21 like the vertical rib 21 shown in FIG. Will be. Moreover, the steel pipe pile 1 to which the present invention is applied, even when the lamellar resistant steel 6 is not used, as shown in FIG. The hole 30 or the notch 31 penetrated in the plate thickness direction is formed in the steel plate 3 for fixing reinforcing bars.

本発明を適用した鋼管杭1の施工方法は、図12に示すように、水底地盤8に杭本体5を立設する立設工程と、杭本体5の天端5a側に杭頭構造2を設ける接合工程とを備える。このとき、本発明を適用した鋼管杭1の施工方法は、主に、図1に示す杭式構造物7の各々の鋼管杭1を対象として実施されるものとなる。   As shown in FIG. 12, the construction method of the steel pipe pile 1 to which the present invention is applied includes a standing step of standing the pile main body 5 on the water bottom ground 8, and the pile head structure 2 on the top end 5 a side of the pile main body 5. A joining step to be provided. At this time, the construction method of the steel pipe pile 1 to which the present invention is applied is mainly implemented for each steel pipe pile 1 of the pile structure 7 shown in FIG.

立設工程では、図12(a)に示すように、スパイラル鋼管等の杭本体5が、回転圧入等により、海水面上から水底地盤8に埋め込まれる。このとき、立設工程では、杭本体5の下端5bが水底地盤8内に配置されるとともに、杭本体5の天端5aが海水面側に配置されて、杭本体5が水底地盤8に立設されるものとなる。   In the erection process, as shown in FIG. 12A, a pile body 5 such as a spiral steel pipe is embedded in the bottom bottom ground 8 from above the seawater surface by rotational press-fitting or the like. At this time, in the standing step, the lower end 5b of the pile main body 5 is disposed in the water bottom ground 8, the top end 5a of the pile main body 5 is disposed on the sea surface side, and the pile main body 5 stands on the water bottom ground 8. It will be established.

接合工程では、図12(b)に示すように、水底地盤8に立設された杭本体5に、鉄筋定着用鋼板3が溶接接合された鋼管4を、杭頭構造2として取り付ける。このとき、接合工程では、杭本体5の天端5aに鋼管4の下端部4bが溶接接合で取り付けられることで、鋼管4の上端部4aが海水面上から突出して配置されるものとなる。   In the joining step, as shown in FIG. 12 (b), the steel pipe 4 in which the reinforcing steel plate 3 is welded to the pile main body 5 erected on the water bottom ground 8 is attached as the pile head structure 2. At this time, in the joining process, the lower end portion 4b of the steel pipe 4 is attached to the top end 5a of the pile body 5 by welding joining, so that the upper end portion 4a of the steel pipe 4 protrudes from the seawater surface.

本発明を適用した杭式構造物7の施工方法は、図13、図14に示すように、水底地盤8に複数の杭本体5を立設する立設工程と、杭本体5の天端5a側に杭頭構造2を設ける接合工程と、上部コンクリート71の内部に杭頭構造2を埋め込む埋設工程とを備える。   As shown in FIGS. 13 and 14, the construction method of the pile structure 7 to which the present invention is applied includes a standing process for standing a plurality of pile bodies 5 on the water bottom ground 8, and a top end 5 a of the pile body 5. A joining step of providing the pile head structure 2 on the side and a burying step of embedding the pile head structure 2 inside the upper concrete 71 are provided.

立設工程では、複数の杭本体5を対象として、本発明を適用した鋼管杭1の施工方法における立設工程と同様に、各々の杭本体5を水底地盤8に回転圧入等することで、図13(a)に示すように、複数の杭本体5が水底地盤8に立設されるものとなる。   In the standing process, for each of the plurality of pile main bodies 5, as in the standing process in the construction method of the steel pipe pile 1 to which the present invention is applied, each pile main body 5 is rotationally press-fitted into the water bottom ground 8. As shown to Fig.13 (a), the some pile main body 5 will be erected on the water bottom ground 8. As shown in FIG.

接合工程でも、本発明を適用した鋼管杭1の施工方法における接合工程と同様に、図13(b)に示すように、水底地盤8に立設された各々の杭本体5に、鉄筋定着用鋼板3が溶接接合された鋼管4を、杭頭構造2として取り付ける。なお、杭式構造物7の施工方法における接合工程では、水底地盤8に立設された全部の杭本体5に鋼管4が取り付けられるほか、水底地盤8に立設された一部の杭本体5にのみ鋼管4が取り付けられてもよい。   Also in the joining step, as in the joining step in the construction method of the steel pipe pile 1 to which the present invention is applied, as shown in FIG. 13 (b), each pile main body 5 erected on the water bottom ground 8 is used for fixing a reinforcing bar. A steel pipe 4 to which a steel plate 3 is welded is attached as a pile head structure 2. In addition, in the joining process in the construction method of the pile-type structure 7, the steel pipe 4 is attached to all the pile main bodies 5 erected on the submarine ground 8, and some of the pile main bodies 5 erected on the submarine ground 8. Only the steel pipe 4 may be attached.

本発明を適用した鋼管杭1の施工方法及び杭式構造物7の施工方法の何れの接合工程にもおいても、図6(a)に示すように、杭頭構造2において鉄筋定着用鋼板3が溶接接合される接合箇所Jの鋼管4に、板厚方向の絞り値を所定値とし、かつ、硫黄(S)含有量を質量%で所定値とした耐ラメラティア鋼6を用いるものとする。   In any of the joining steps of the construction method of the steel pipe pile 1 and the construction method of the pile structure 7 to which the present invention is applied, as shown in FIG. For the steel pipe 4 at the joint J where 3 is welded, the lamellar resistant steel 6 is used in which the drawing value in the plate thickness direction is a predetermined value and the sulfur (S) content is a predetermined value in mass%. .

埋設工程では、最初に、図14(a)に示すように、満潮時水位HWLから上方に離間させた位置にコンクリート打設用の型枠75を設置する。また、埋設工程では、型枠75の設置に前後させて、鉄筋定着用鋼板3に鉄筋70が溶接接合されて連結される。そして、埋設工程では、鉄筋定着用鋼板3に溶接接合された鉄筋70が、幅方向X又は奥行方向Yに隣り合った複数の鋼管杭1の各々の杭頭構造2に架設されるものとなる。   In the embedding process, first, as shown in FIG. 14A, a concrete casting form 75 is installed at a position spaced upward from the high tide level HWL. In the embedding process, the reinforcing bar 70 is welded and connected to the reinforcing steel sheet 3 before and after the installation of the mold 75. In the embedding step, the reinforcing bar 70 welded to the reinforcing steel plate 3 is installed on each pile head structure 2 of the plurality of steel pipe piles 1 adjacent to each other in the width direction X or the depth direction Y. .

埋設工程では、次に、型枠75の内部にフレッシュコンクリートを打設して硬化させてから型枠75を撤去することで、図14(b)に示すように、鉄筋コンクリート製の上部コンクリート71がその内部に杭頭構造2を埋め込んだ状態で設けられる。埋設工程では、上部コンクリート71の内部に杭頭構造2を埋め込むことで、鉄筋定着用鋼板3に溶接接合された鉄筋70が上部コンクリート71の内部に配設された状態となって、上部コンクリート71の内部の鉄筋70が鉄筋定着用鋼板3に連結される。   In the embedding process, next, fresh concrete is placed inside the mold 75 and hardened, and then the mold 75 is removed, so that the upper concrete 71 made of reinforced concrete is formed as shown in FIG. It is provided with the pile head structure 2 embedded therein. In the burying step, the pile head structure 2 is embedded in the upper concrete 71, so that the reinforcing bars 70 welded to the reinforcing steel plate 3 are arranged in the upper concrete 71. The rebar 70 inside is connected to the steel plate 3 for fixing the rebar.

埋設工程では、最後に、上部コンクリート71の内部の鉄筋70を鉄筋定着用鋼板3に連結して、互いに隣り合った複数の鋼管杭1に鉄筋70が架設された状態となる。そして、埋設工程では、満潮時水位HWLから上方に離間させた位置に、上部コンクリート71の下端面71aが配置されて、上部コンクリート71を複数の杭本体5で支持するものとする。このとき、埋設工程では、図1に示すように、海水面等の上方で複数の鋼管杭1に架設されるコンクリート梁72が設けられて、必要に応じて、床版73も設けられる。   In the embedding step, finally, the reinforcing bars 70 in the upper concrete 71 are connected to the steel plate 3 for fixing the reinforcing bars, and the reinforcing bars 70 are installed in a plurality of adjacent steel pipe piles 1. In the burying step, the lower concrete surface 71a of the upper concrete 71 is disposed at a position spaced upward from the high tide level HWL, and the upper concrete 71 is supported by the plurality of pile main bodies 5. At this time, in the embedding process, as shown in FIG. 1, concrete beams 72 installed on the plurality of steel pipe piles 1 are provided above the sea surface and the like, and a floor slab 73 is also provided as necessary.

本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、図15(a)に示すように、杭頭構造2における鋼管4又は杭本体5(以下、鋼管4等)の側面2aに、鉄筋定着用鋼板3の開先が完全溶け込み溶接で溶接接合される。そして、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、上部コンクリート71の内部の鉄筋70が鉄筋定着用鋼板3に連結されることで、鉄筋70から鉄筋定着用鋼板3に引張力Tが伝達される。   The steel pipe pile 1, the pile head structure 2 and the pile type structure 7 to which the present invention is applied include a steel pipe 4 or a pile main body 5 (hereinafter referred to as a steel pipe 4 or the like) in the pile head structure 2 as shown in FIG. The groove of the reinforcing steel plate 3 is welded to the side surface 2a by complete penetration welding. And the steel pipe pile 1, the pile head structure 2, and the pile type structure 7 to which this invention is applied are connected to the steel plate 3 for reinforcing bar fixation by connecting the reinforcing bar 70 in the upper concrete 71 to the steel plate 3 for fixing reinforcing bar. A tensile force T is transmitted to the steel plate 3.

本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋70から鉄筋定着用鋼板3に引張力Tが伝達されるため、鉄筋定着用鋼板3が溶接接合された接合箇所Jから鋼管4等の側面2aに対して、この引張力Tが側面2aの略直交方向に作用する。しかし、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、特に、鉄筋定着用鋼板3の接合箇所Jの鋼管4等に耐ラメラティア鋼6が用いられるものとなる。   In the steel pipe pile 1, the pile head structure 2 and the pile structure 7 to which the present invention is applied, the tensile force T is transmitted from the reinforcing bar 70 to the reinforcing steel plate 3, so that the reinforcing steel plate 3 is joined by welding. This tensile force T acts on the side surface 2a of the steel pipe 4 or the like from the location J in a direction substantially orthogonal to the side surface 2a. However, in the steel pipe pile 1, the pile head structure 2 and the pile structure 7 to which the present invention is applied, particularly, the lamellar-resistant steel 6 is used for the steel pipe 4 or the like of the joint J of the steel plate 3 for reinforcing steel bars.

このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、この引張力Tが鋼管4等の側面2aの略直交方向に作用するにもかかわらず、杭頭構造2における鋼管4等のラメラティア破壊が抑制されるものとなる。これに対して、従来の鋼管杭式桟橋9等においては、図15(b)に示すように、各々の鋼管杭90に発生し得るラメラティア破壊への対策がなされておらず、鋼管杭90の側面と平行な割裂Sが板厚内部に発生することで、構造上の欠陥が生じるおそれがあった。   At this time, the steel pipe pile 1, the pile head structure 2 and the pile type structure 7 to which the present invention is applied have a pile head structure despite the fact that this tensile force T acts in the substantially orthogonal direction of the side surface 2a of the steel pipe 4 or the like. Lamella tear destruction of the steel pipe 4 etc. in 2 will be suppressed. On the other hand, in the conventional steel pipe pile type pier 9 and the like, as shown in FIG. 15 (b), no countermeasure is taken against the lamellar tear that may occur in each steel pipe pile 90. There is a possibility that structural defects may occur due to the generation of the split S parallel to the side surface inside the plate thickness.

このため、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、図15に示すように、特に、鉄筋定着用鋼板3の接合箇所Jに耐ラメラティア鋼6が用いられることで、杭頭構造2における鋼管4等の耐ラメラティア破壊性能が向上する。そして、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、杭頭構造2における耐ラメラティア破壊性能が向上して、上部コンクリート71の内部の鉄筋70と鋼管杭1の杭頭構造2との連結状態が頑強なまま維持されることで、沿岸の水域に設けられて経年した港湾構造物等においても、高い構造上の安全性を確保することが可能となる。   For this reason, as shown in FIG. 15, the steel pipe pile 1, the pile head structure 2, and the pile type structure 7 to which the present invention is applied, particularly, the lamellar-resistant steel 6 is used at the joint J of the steel plate 3 for reinforcing steel bars. This improves the lamellar tear resistance of the steel pipe 4 and the like in the pile head structure 2. And the steel pipe pile 1, the pile head structure 2, and the pile type structure 7 to which this invention is applied improve the lamellar tear breaking performance in the pile head structure 2, and the reinforcement 70 inside the upper concrete 71 and the steel pipe pile 1 By maintaining the connection state with the pile head structure 2 robustly, it is possible to ensure high structural safety even in a harbor structure or the like provided in the coastal water area.

また、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、杭本体5の全長に高価な耐ラメラティア鋼6を用いることなく、鉄筋定着用鋼板3の接合箇所Jの鋼管4等にのみ重点的に耐ラメラティア鋼6を用いることで、耐ラメラティア破壊性能を低コストで向上させることが可能となる。また、耐ラメラティア鋼6は、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下として、板厚方向の絞り値及び硫黄(S)含有量を適宜調節することで、要求される水準に合わせて耐ラメラティア破壊性能を調節させることが可能となる。   Moreover, the steel pipe pile 1, the pile head structure 2, and the pile type structure 7 to which the present invention is applied do not use the expensive lamellar resistant steel 6 for the entire length of the pile main body 5, and the joint J of the steel plate 3 for fixing reinforcing bars is used. By using the lamellar resistant steel 6 mainly for the steel pipe 4 or the like, the lamellar resistant resistance can be improved at a low cost. In addition, the lamellar steel 6 has a drawing value in the plate thickness direction of 10% or more and a sulfur (S) content of 0.010% or less in mass%, and a drawing value in the plate thickness direction and sulfur (S) content. By appropriately adjusting the amount, the lamellar tear resistance can be adjusted to the required level.

また、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、スパイラル鋼管等の杭本体5に一般的な鋼種が用いられて、耐ラメラティア鋼6が全長等に用いられた鋼管4を杭本体5の天端5aに取り付けることができる。このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、耐ラメラティア鋼6が用いられた鋼管4を杭本体5の天端5aに溶接等するだけの容易な作業で、鉄筋定着用鋼板3の接合箇所Jで杭頭構造2の耐ラメラティア破壊性能を向上させることが可能となる。   Moreover, as for the steel pipe pile 1, the pile head structure 2, and the pile type structure 7 to which this invention is applied, a general steel type is used for the pile main bodies 5 such as spiral steel pipes, and the lamellar-resistant steel 6 is used for the entire length or the like. The steel pipe 4 can be attached to the top end 5a of the pile body 5. At this time, the steel pipe pile 1 to which the present invention is applied, the pile head structure 2 and the pile structure 7 are easy to simply weld the steel pipe 4 using the lamellar resistant steel 6 to the top end 5a of the pile body 5. It becomes possible to improve the lamellar tear resistance of the pile head structure 2 at the joint J of the steel plate 3 for fixing reinforcing bars.

また、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、図7(a)に示すように、杭本体5との境界となる鋼管4の下端部4bが、上部コンクリート71の下端面71aから上方に50mm〜200mmの範囲まで離間させた位置に配置されてもよい。このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋70や鉄筋定着用鋼板3に対するコンクリートのかぶりが確保され、構造物としての耐久性を担保することが可能となる。   Moreover, as shown to Fig.7 (a), the steel pipe pile 1 to which this invention is applied, the pile head structure 2, and the pile-type structure 7 have the lower end part 4b of the steel pipe 4 used as the boundary with the pile main body 5, as an upper part. You may arrange | position in the position spaced apart from the lower end surface 71a of the concrete 71 to the range of 50 mm-200 mm upward. At this time, the steel pipe pile 1, the pile head structure 2 and the pile-type structure 7 to which the present invention is applied ensure a concrete cover for the reinforcing bar 70 and the reinforcing steel plate 3 to secure the durability as a structure. Is possible.

また、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、図7(b)に示すように、杭本体5との境界となる鋼管4の下端部4bが、上部コンクリート71の下端面71aから下方に、杭本体5の管径Dの大きさ以上離間させた位置に配置されてもよい。このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋定着用鋼板3に鉄筋70が連結されることによる応力集中が上部コンクリート71の近傍で発生するものの、杭本体5と鋼管4との境界が上部コンクリート71から十分に離間して応力集中の影響が低減するため、鋼管4の脱落等を抑制、防止することが可能となる。   Moreover, as shown in FIG.7 (b), the steel pipe pile 1 to which this invention is applied, the pile head structure 2, and the pile-type structure 7 have the lower end part 4b of the steel pipe 4 used as the boundary with the pile main body 5, as an upper part. You may arrange | position in the position spaced apart from the lower end surface 71a of the concrete 71 more than the magnitude | size of the pipe diameter D of the pile main body 5. FIG. At this time, in the steel pipe pile 1, the pile head structure 2 and the pile structure 7 to which the present invention is applied, stress concentration is generated in the vicinity of the upper concrete 71 due to the rebar 70 being connected to the steel plate 3 for fixing the rebar. Since the boundary between the pile main body 5 and the steel pipe 4 is sufficiently separated from the upper concrete 71 and the influence of stress concentration is reduced, it is possible to suppress or prevent the steel pipe 4 from dropping off.

また、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、図8に示すように、杭本体5との境界となる鋼管4の下端部4bが、干潮時水位LWLよりも1m程度下方となる位置で、常時海水面下となる位置に配置されて、必要に応じて、鋼管4と杭本体5との境界が被覆防食層11で覆われるものとなる。このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、杭本体5と鋼管4との境界を常時海水面下に配置して、又は被覆防食層11で覆うことで、杭本体5と鋼管4との境界における腐食による経年劣化、及び漂流物の衝突による損傷等を抑制、防止することが可能となる。   Moreover, as shown in FIG. 8, the steel pipe pile 1 to which this invention is applied, the pile head structure 2, and the pile-type structure 7 have the lower end part 4b of the steel pipe 4 used as the boundary with the pile main body 5, the water level LWL at the time of low tide. It is arrange | positioned in the position which is always below sea level in the position which is about 1 m below, and the boundary of the steel pipe 4 and the pile main body 5 will be covered with the coating | coated anticorrosion layer 11 as needed. At this time, the steel pipe pile 1, the pile head structure 2 and the pile type structure 7 to which the present invention is applied are always arranged at the boundary between the pile main body 5 and the steel pipe 4 below the sea surface or covered with the coating anticorrosion layer 11. Thus, it is possible to suppress and prevent aged deterioration due to corrosion at the boundary between the pile main body 5 and the steel pipe 4, damage due to collision of drifting objects, and the like.

本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、杭頭構造2の鋼管4等に耐ラメラティア鋼6が用いられるか否かにかかわらず、図9、図11に示すように、鋼管4又は杭本体5の側面2a、及び鉄筋定着用鋼板3の上面3aの何れか一方又は両方に、縦リブ21が接合されてもよい。そして、この縦リブ21には、必要に応じて、板厚方向に貫通させた孔部30又は切欠部31(以下、孔部30等)が形成される。   The steel pipe pile 1, the pile head structure 2 and the pile-type structure 7 to which the present invention is applied are shown in FIGS. 9 and 11 regardless of whether the lamellar steel 6 is used for the steel pipe 4 of the pile head structure 2 or the like. As shown, the longitudinal ribs 21 may be joined to either one or both of the side surface 2a of the steel pipe 4 or the pile body 5 and the upper surface 3a of the steel plate 3 for reinforcing steel bars. The vertical rib 21 is formed with a hole 30 or a notch 31 (hereinafter referred to as a hole 30 or the like) penetrating in the plate thickness direction as necessary.

縦リブ21が鋼管4等の側面2a及び鉄筋定着用鋼板3の上面3aの両方に接合される場合は、鋼管4等の側面2aに鉄筋定着用鋼板3を接合させる前段で、縦リブ21を鉄筋定着用鋼板3の上面3aに接合させてから鋼管4等の側面2aに仮付け溶接させることができる。そして、鋼管4等の側面2aに仮付け溶接された縦リブ21に鉄筋定着用鋼板3が接合されているため、鋼管4等の側面2aに対して鉄筋定着用鋼板3の位置決めをした状態で、鉄筋定着用鋼板3の開先を鋼管4等の側面2aに完全溶け込み溶接等で溶接接合することができる。このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋定着用鋼板3の位置決めをした状態で完全溶け込み溶接等ができるため、鋼管4等の側面2aに対する鉄筋定着用鋼板3の溶接作業を効率的に実施することが可能となる。なお、杭本体5の天端5aに鋼管4が取り付けられる場合は、鉄筋定着用鋼板3の鋼管4の側面2aに対する溶接作業を工場でも実施することができる。   When the vertical rib 21 is joined to both the side surface 2a of the steel pipe 4 and the upper surface 3a of the reinforcing steel plate 3, the longitudinal rib 21 is formed before the reinforcing steel plate 3 is joined to the side surface 2a of the steel pipe 4 or the like. After joining to the upper surface 3a of the steel plate 3 for reinforcing steel bars, it can be tack welded to the side surface 2a of the steel pipe 4 or the like. And since the steel plate 3 for reinforcing bar fixing is joined to the vertical rib 21 which is tack welded to the side surface 2a of the steel pipe 4 etc., the steel plate 3 for reinforcing bar fixing is positioned with respect to the side surface 2a of the steel pipe 4 etc. The groove of the steel plate 3 for fixing reinforcing bars can be welded and joined to the side surface 2a of the steel pipe 4 or the like by complete penetration welding or the like. At this time, the steel pipe pile 1, the pile head structure 2 and the pile type structure 7 to which the present invention is applied can perform complete penetration welding or the like in a state in which the steel plate 3 for fixing reinforcing bars is positioned. It becomes possible to efficiently perform the welding operation of the steel plate 3 for reinforcing steel bars. In addition, when the steel pipe 4 is attached to the top end 5a of the pile main body 5, the welding operation | work with respect to the side surface 2a of the steel pipe 4 of the steel plate 3 for reinforcing steel can be implemented also in a factory.

本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、図16(a)に示すように、杭式構造物7に水平外力、鉛直外力等が作用すると、杭本体5に押込力又は引抜力等の軸方向力Pが発生する。そして、押込力は、上部コンクリート71の内部に埋め込んだ杭頭構造2とコンクリートとの付着力と、杭頭構造2の上端部4aから上部コンクリート71の上端面71bまでの押抜きせん断抵抗力とによって、上部コンクリート71に伝達される。また、引抜力は、上部コンクリート71の内部に埋め込んだ杭頭構造2とコンクリートとの付着力によって、上部コンクリート71に伝達される。   The steel pipe pile 1, the pile head structure 2 and the pile type structure 7 to which the present invention is applied, as shown in FIG. 16 (a), when a horizontal external force, a vertical external force, etc. act on the pile type structure 7, the pile body 5 An axial force P such as pushing force or pulling force is generated. The indentation force includes the adhesion force between the pile head structure 2 embedded in the upper concrete 71 and the concrete, the punching shear resistance force from the upper end portion 4a of the pile head structure 2 to the upper end surface 71b of the upper concrete 71, and Is transmitted to the upper concrete 71. Further, the pulling force is transmitted to the upper concrete 71 by the adhesion force between the pile head structure 2 embedded in the upper concrete 71 and the concrete.

一般的に、大規模地震等の際には、杭本体5に作用する軸方向力Pが大きくなり、従来実施されている杭頭構造2の上部コンクリート71の内部への埋設長(例えば、管径Dの大きさと同程度)では対応できない場合がある。そして、上部コンクリート71の内部への杭頭構造2の埋設長を大きくする方法も考えられるが、上部コンクリート71の全体の高さを大きくすると、供用上の制限が課されることで対応できない場合があった。   In general, in the case of a large-scale earthquake or the like, the axial force P acting on the pile body 5 is increased, and the length of embedding in the upper concrete 71 of the pile head structure 2 that is conventionally performed (for example, a pipe) In some cases, it is not possible to cope with the same as the size of the diameter D. And although the method of enlarging the embedding length of the pile head structure 2 in the inside of the upper concrete 71 is also considered, if the overall height of the upper concrete 71 is increased, it may not be possible due to restrictions imposed on service. was there.

このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、特に、鋼管4等の側面2a及び鉄筋定着用鋼板3の上面3aの少なくとも何れか一方に、縦リブ21が接合されることで、上部コンクリート71の内部に埋め込んだ縦リブ21とコンクリートとの付着力が付加されるため、大規模地震等にも対応可能な付着力を確保して、鋼管杭1に発生する軸方向力Pを上部コンクリート71に十分に伝達することが可能となる。また、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、縦リブ21に板厚方向に貫通させた孔部30等が形成されることで、縦リブ21が軽量化するとともに、縦リブ21とコンクリートとの付着力がジベル効果により向上するため、縦リブ21の数量を減らせられるほか、上部コンクリート71への軸方向力Pの伝達をより確実なものとできる。   At this time, the steel pipe pile 1, the pile head structure 2 and the pile structure 7 to which the present invention is applied have, in particular, vertical ribs on at least one of the side surface 2 a of the steel pipe 4 and the upper surface 3 a of the steel plate 3 for reinforcing steel bars. 21 is joined, so that the adhesion between the vertical ribs 21 embedded in the upper concrete 71 and the concrete is added, so that the adhesion that can cope with a large-scale earthquake or the like is secured, and the steel pipe pile 1 It is possible to sufficiently transmit the axial force P generated in the upper concrete 71 to the upper concrete 71. Moreover, the steel pipe pile 1, the pile head structure 2, and the pile-type structure 7 to which the present invention is applied are such that the vertical ribs 21 are light-weighted by forming the holes 30 and the like that are penetrated in the thickness direction in the vertical ribs 21. In addition, since the adhesive force between the vertical ribs 21 and the concrete is improved by the Giberl effect, the number of the vertical ribs 21 can be reduced, and the transmission of the axial force P to the upper concrete 71 can be made more reliable.

本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、図16(b)に示すように、杭頭構造2の周囲に設置された型枠75の内部にフレッシュコンクリートを打設して硬化させることで、鉄筋コンクリート製の上部コンクリート71が設けられる。このとき、型枠75の内部に打設されたフレッシュコンクリートは、鉄筋定着用鋼板3の下方から徐々に充填されるときに、鉄筋定着用鋼板3の下面側にコンクリートの空気溜まりが形成されて、上部コンクリート71に強度上の欠陥が生じるおそれがある。   As shown in FIG. 16 (b), the steel pipe pile 1, pile head structure 2 and pile type structure 7 to which the present invention is applied have fresh concrete inside the formwork 75 installed around the pile head structure 2. By placing and hardening, the upper concrete 71 made of reinforced concrete is provided. At this time, when the fresh concrete placed inside the mold 75 is gradually filled from below the reinforcing steel plate 3, a concrete air pocket is formed on the lower surface side of the reinforcing steel plate 3. There is a possibility that a defect in strength may occur in the upper concrete 71.

本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、特に、杭頭構造2の鉄筋定着用鋼板3に板厚方向に貫通させた孔部30等が形成されることで、型枠75の内部にフレッシュコンクリートを充填するときに、鉄筋定着用鋼板3の孔部30等を通じて下方から上方に空気Aが抜けるものとなる。このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋定着用鋼板3の下方からフレッシュコンクリートを充填するときに、鉄筋定着用鋼板3の下面側に空気溜まりが形成されないものとなって、上部コンクリート71における強度上の欠陥の発生を抑制することが可能となる。鉄筋定着用鋼板3に形成された孔部30等は、特に、幅方向X又は奥行方向Yで鉄筋定着用鋼板3の中央よりも鋼管4等の側面2aに近接させた部分で、鉄筋定着用鋼板3を開口又は切り欠いて形成されることが望ましい。このとき、鉄筋定着用鋼板3の下面側で鋼管4等の側面2aに近接させた部分に空気溜まりが形成され易いが、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鋼管4等の側面2aに近接させた部分で鉄筋定着用鋼板3に孔部30等が形成されることで、鉄筋定着用鋼板3の下方から上方に空気Aが抜け易くなる。   In the steel pipe pile 1, the pile head structure 2 and the pile structure 7 to which the present invention is applied, in particular, a hole 30 or the like that is penetrated in the thickness direction of the steel plate 3 for reinforcing bar fixing of the pile head structure 2 is formed. Thus, when fresh concrete is filled into the mold 75, the air A escapes upward from below through the hole 30 of the steel plate 3 for fixing reinforcing bars. At this time, when the steel pipe pile 1, the pile head structure 2 and the pile structure 7 to which the present invention is applied are filled with fresh concrete from below the reinforcing steel plate 3, the air is applied to the lower surface side of the reinforcing steel plate 3. It is possible to suppress the occurrence of strength defects in the upper concrete 71 because no pool is formed. The hole 30 or the like formed in the reinforcing steel plate 3 is a portion that is closer to the side surface 2a of the steel pipe 4 or the like than the center of the reinforcing steel plate 3 in the width direction X or the depth direction Y. It is desirable that the steel plate 3 is formed by opening or notching. At this time, an air pocket is easily formed on the lower surface side of the steel plate 3 for reinforcing steel bars close to the side surface 2a such as the steel pipe 4, but the steel pipe pile 1, the pile head structure 2 and the pile type structure to which the present invention is applied. 7, the hole 30 is formed in the reinforcing steel plate 3 at a portion close to the side surface 2 a of the steel pipe 4 or the like, so that the air A easily escapes from below to above the reinforcing steel plate 3.

また、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋定着用鋼板3に孔部30等が形成されることで、鉄筋定着用鋼板3が軽量化するほか、鉄筋定着用鋼板3とコンクリートとの付着力がジベル効果により向上する。このとき、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋定着用鋼板3に孔部30等が形成されることで、鉄筋70から鉄筋定着用鋼板3に伝達される引張力Tの一部をこの付着力により相殺させて、鋼管4等の側面2aの略直交方向に作用する引張力Tが低減するため、杭頭構造2の耐ラメラティア破壊性能を一段と向上させることが可能となる。なお、本発明を適用した鋼管杭1、杭頭構造2及び杭式構造物7は、鉄筋定着用鋼板3に孔部30が形成される場合には、鋼管4等の側面2aに対する鉄筋定着用鋼板3の開先の溶接長を、鋼管4等の側面2aの略全周に亘って十分に確保することが可能となる。   Moreover, the steel pipe pile 1, the pile head structure 2, and the pile-type structure 7 to which the present invention is applied include the formation of the hole 30 or the like in the reinforcing steel plate 3 to reduce the weight of the reinforcing steel plate 3. The adhesion between the steel plate 3 for fixing reinforcing bars and the concrete is improved by the Giber effect. At this time, the steel pipe pile 1 to which the present invention is applied, the pile head structure 2 and the pile structure 7 are formed from the reinforcing bar 70 to the reinforcing steel plate 3 by forming the hole 30 or the like in the reinforcing steel plate 3. A part of the transmitted tensile force T is offset by this adhesion force, and the tensile force T acting in the substantially orthogonal direction of the side surface 2a of the steel pipe 4 or the like is reduced, so that the lamellar tear resistance of the pile head structure 2 is further improved. It becomes possible to improve. In addition, the steel pipe pile 1, the pile head structure 2, and the pile type structure 7 to which the present invention is applied are used for fixing the reinforcing bar to the side surface 2a of the steel pipe 4 or the like when the hole 30 is formed in the reinforcing bar fixing steel plate 3. The weld length of the groove of the steel plate 3 can be sufficiently ensured over substantially the entire circumference of the side surface 2a of the steel pipe 4 or the like.

また、本発明を適用した杭頭構造2は、杭本体5の天端5aに鋼管4が取り付けられて設けられるため、鋼管4の側面2aに鉄筋定着用鋼板3を工場等で溶接して、鉄筋定着用鋼板3が溶接接合された鋼管4を現場に搬入してから、杭本体5の天端5aに現場で鋼管4を溶接接合等で取り付けることができる。また、本発明を適用した鋼管杭1の施工方法、及び杭式構造物7の施工方法は、図12、図13に示すように、杭本体5が回転圧入等により水底地盤8に埋め込まれるため、水底地盤8に埋め込まれた杭本体5の天端5aの幅方向X及び奥行方向Yにおける位置が定まった後、杭本体5の天端5aに鋼管4を取り付けることができる。このとき、本発明を適用した鋼管杭1の施工方法、及び杭式構造物7の施工方法は、杭本体5の天端5aに後から鋼管4が取り付けられるため、上部コンクリート71の内部で鉄筋70が配設される方向に合わせて、鉄筋定着用鋼板3の幅方向X及び奥行方向Yにおける位置決めを容易に実施することが可能となる。   Moreover, since the pile head structure 2 to which the present invention is applied is provided with the steel pipe 4 attached to the top end 5a of the pile body 5, the steel plate 4 for rebar fixing is welded to the side surface 2a of the steel pipe 4 at a factory or the like, After the steel pipe 4 welded and joined to the reinforcing steel plate 3 is carried into the site, the steel pipe 4 can be attached to the top end 5a of the pile body 5 by welding or the like on the site. Moreover, since the construction method of the steel pipe pile 1 to which this invention is applied, and the construction method of the pile-type structure 7 are shown in FIG. 12, FIG. 13, the pile main body 5 is embedded in the underwater ground 8 by rotary press fit etc. The steel pipe 4 can be attached to the top end 5a of the pile body 5 after the positions in the width direction X and the depth direction Y of the top end 5a of the pile body 5 embedded in the water bottom ground 8 are determined. At this time, the construction method of the steel pipe pile 1 and the construction method of the pile structure 7 to which the present invention is applied are because the steel pipe 4 is attached to the top end 5a of the pile body 5 later. In accordance with the direction in which 70 is disposed, it is possible to easily perform positioning in the width direction X and the depth direction Y of the steel plate 3 for fixing reinforcing bars.

以上、本発明の実施形態の例について詳細に説明したが、上述した実施形態は、何れも本発明を実施するにあたっての具体化の例を示したものに過ぎず、これらによって本発明の技術的範囲が限定的に解釈されてはならない。   As mentioned above, although the example of embodiment of this invention was demonstrated in detail, all the embodiment mentioned above showed only the example of actualization in implementing this invention, and these are the technical aspects of this invention. The range should not be interpreted in a limited way.

1 :鋼管杭
11 :被覆防食層
2 :杭頭構造
2a :側面
21 :縦リブ
3 :鉄筋定着用鋼板
3a :上面
30 :孔部
31 :切欠部
4 :鋼管
4a :上端部
4b :下端部
5 :杭本体
5a :天端
5b :下端
6 :耐ラメラティア鋼
7 :杭式構造物
70 :鉄筋
71 :上部コンクリート
71a :下端面
71b :上端面
72 :コンクリート梁
73 :床版
75 :型枠
8 :水底地盤
X :幅方向
Y :奥行方向
Z :高さ方向
DESCRIPTION OF SYMBOLS 1: Steel pipe pile 11: Coating | coated anticorrosion layer 2: Pile head structure 2a: Side 21: Vertical rib 3: Steel plate 3a for reinforcing bar fixation: Upper surface 30: Hole 31: Notch part 4: Steel pipe 4a: Upper end part 4b: Lower end part 5 : Pile body 5a: Top end 5b: Lower end 6: Lamella steel 7: Pile structure 70: Reinforcement 71: Upper concrete 71a: Lower end surface 71b: Upper end surface 72: Concrete beam 73: Floor slab 75: Formwork 8: Underwater ground X: Width direction Y: Depth direction Z: Height direction

Claims (14)

沿岸の水域に設けられる杭式構造物の鋼管杭であって、
水底地盤に立設される杭本体と、前記杭本体の天端側に設けられる杭頭構造とを備え、
前記杭頭構造は、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板を有し、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管が、少なくとも前記鉄筋定着用鋼板が溶接接合される接合箇所に用いられること
を特徴とする鋼管杭。
A steel pipe pile of a pile-type structure provided in a coastal water area,
A pile main body standing on the bottom of the water, and a pile head structure provided on the top end side of the pile main body,
The pile head structure has a steel plate for reinforcing steel bars to which the internal reinforcement of the upper concrete supported by the pile body is connected, and has a drawing value in the thickness direction of 10% or more, and a sulfur (S) content. A steel pipe pile, characterized in that a steel pipe made of lamellar-resistant steel with a mass% of 0.010% or less is used at least at a joint where the steel plate for fixing reinforcing bars is welded.
前記杭頭構造は、前記杭本体に取り付けられる鋼管を有し、
前記鋼管は、前記鉄筋定着用鋼板が溶接接合される接合箇所を包摂し、かつ、前記鉄筋定着用鋼板の板厚以上の範囲に、前記耐ラメラティア鋼からなる鋼管が用いられること
を特徴とする請求項1記載の鋼管杭。
The pile head structure has a steel pipe attached to the pile body,
The steel pipe includes a joint portion where the steel plate for fixing the reinforcing bar is welded, and a steel pipe made of the lamellar-resistant steel is used in a range equal to or greater than the thickness of the steel plate for fixing the reinforcing bar. The steel pipe pile according to claim 1.
前記杭頭構造は、前記鋼管の上端部が、前記上部コンクリートの内部に埋め込まれるとともに、前記杭本体との境界となる前記鋼管の下端部が、前記上部コンクリートの下端面から上方に50mm〜200mmの範囲まで離間させた位置に配置されること
を特徴とする請求項2記載の鋼管杭。
In the pile head structure, the upper end portion of the steel pipe is embedded in the upper concrete, and the lower end portion of the steel pipe serving as a boundary with the pile body is 50 mm to 200 mm upward from the lower end surface of the upper concrete. The steel pipe pile according to claim 2, wherein the steel pipe pile is arranged at a position separated to a range of.
前記杭頭構造は、前記鋼管の上端部が、前記上部コンクリートの内部に埋め込まれるとともに、前記杭本体との境界となる前記鋼管の下端部が、前記上部コンクリートの下端面から下方に、前記杭本体の管径の大きさ以上離間させた位置に配置されること
を特徴とする請求項2記載の鋼管杭。
In the pile head structure, an upper end portion of the steel pipe is embedded in the upper concrete, and a lower end portion of the steel pipe serving as a boundary with the pile main body is downward from a lower end surface of the upper concrete. The steel pipe pile according to claim 2, wherein the steel pipe pile is arranged at a position separated from the pipe diameter of the main body.
前記杭頭構造は、前記鋼管の上端部が、前記上部コンクリートの内部に埋め込まれるとともに、前記杭本体との境界となる前記鋼管の下端部が、干潮時水位よりも1m程度下方となる位置に配置されること
を特徴とする請求項2記載の鋼管杭。
In the pile head structure, the upper end portion of the steel pipe is embedded in the upper concrete, and the lower end portion of the steel pipe serving as a boundary with the pile body is at a position about 1 m below the water level at low tide. The steel pipe pile according to claim 2, wherein the steel pipe pile is arranged.
前記杭頭構造は、前記杭本体との境界となる前記鋼管の下端部が、前記杭本体及び前記鋼管とともに被覆防食されること
を特徴とする請求項5記載の鋼管杭。
The steel pipe pile according to claim 5, wherein the pile head structure is coated and anticorrosive with a lower end portion of the steel pipe, which becomes a boundary with the pile main body, together with the pile main body and the steel pipe.
前記杭頭構造は、高さ方向に延びる縦リブが、前記鋼管又は前記杭本体の側面及び前記鉄筋定着用鋼板に接合されて、
前記縦リブは、板厚方向に貫通させた孔部又は切欠部が形成されること
を特徴とする請求項1〜6の何れか1項記載の鋼管杭。
In the pile head structure, vertical ribs extending in the height direction are joined to the steel pipe or the side surface of the pile body and the steel plate for fixing reinforcing bars,
The steel pipe pile according to any one of claims 1 to 6, wherein the vertical rib is formed with a hole or a notch penetrated in a plate thickness direction.
前記鉄筋定着用鋼板は、板厚方向に貫通させた孔部又は切欠部が形成されること
を特徴とする請求項1〜7の何れか1項記載の鋼管杭。
The steel pipe pile according to any one of claims 1 to 7, wherein the steel sheet for fixing reinforcing bars is formed with a hole or a notch that is penetrated in a thickness direction.
沿岸の水域に設けられる杭式構造物の鋼管杭であって、
水底地盤に立設される杭本体と、前記杭本体の天端側に設けられる杭頭構造とを備え、
前記杭頭構造は、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板を有し、高さ方向に延びる縦リブが、前記杭本体の側面及び前記鉄筋定着用鋼板に接合されること
を特徴とする鋼管杭。
A steel pipe pile of a pile-type structure provided in a coastal water area,
A pile main body standing on the bottom of the water, and a pile head structure provided on the top end side of the pile main body,
The pile head structure has a steel plate for fixing reinforcing bars to which reinforcing bars inside the upper concrete supported by the pile main body are connected, and vertical ribs extending in the height direction are used for fixing the side surfaces of the pile main body and the reinforcing bars. A steel pipe pile characterized by being joined to a steel plate.
沿岸の水域に設けられる杭式構造物の鋼管杭であって、
水底地盤に立設される杭本体と、前記杭本体の天端側に設けられる杭頭構造とを備え、
前記杭頭構造は、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板を有し、
前記鉄筋定着用鋼板は、板厚方向に貫通させた孔部又は切欠部が形成されること
を特徴とする鋼管杭。
A steel pipe pile of a pile-type structure provided in a coastal water area,
A pile main body standing on the bottom of the water, and a pile head structure provided on the top end side of the pile main body,
The pile head structure has a steel sheet for reinforcing bar fixing to which the reinforcing bars inside the upper concrete supported by the pile main body are connected,
The steel pipe pile according to claim 1, wherein the steel plate for fixing reinforcing bars is formed with a hole or a notch penetrated in the thickness direction.
沿岸の水域に設けられる杭式構造物の鋼管杭の杭頭構造であって、
水底地盤に立設される杭本体の天端側で前記杭本体に取り付けられる鋼管と、前記杭本体に支持される上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板とを備え、
前記鋼管は、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管が、少なくとも前記鉄筋定着用鋼板が溶接接合される接合箇所に用いられること
を特徴とする杭頭構造。
It is a pile head structure of a steel pipe pile of a pile-type structure provided in a coastal water area,
A steel pipe attached to the pile body on the top end side of the pile body erected on the bottom of the ground, and a steel plate for reinforcing steel fixing to which the reinforcing bars inside the upper concrete supported by the pile body are connected,
The steel pipe is made of a lamellar-resistant steel having a drawing value in the plate thickness direction of 10% or more and a sulfur (S) content of 0.010% by mass or less. Pile head structure characterized by being used for joints to be joined.
沿岸の水域に設けられる杭式構造物であって、
水底地盤に立設される複数の杭本体と、前記杭本体の天端側に設けられる杭頭構造と、複数の前記杭本体に支持される上部コンクリートとを備え、
前記杭頭構造は、前記杭本体に取り付けられる鋼管と、前記上部コンクリートの内部の鉄筋が連結される鉄筋定着用鋼板とを有し、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管が、前記鋼管における少なくとも前記鉄筋定着用鋼板が溶接接合される接合箇所に用いられること
を特徴とする杭式構造物。
A pile-type structure provided in coastal waters,
A plurality of pile main bodies erected on the water bottom ground, a pile head structure provided on the top end side of the pile main bodies, and an upper concrete supported by the plurality of pile main bodies,
The pile head structure has a steel pipe attached to the pile main body, and a steel plate for reinforcing bar fixing to which a reinforcing bar inside the upper concrete is connected, and a drawing value in the thickness direction is 10% or more, and sulfur ( S) A pile-type structure characterized in that a steel pipe made of lamellar steel having a content of 0.010% or less in mass% is used at a joint where at least the steel sheet for reinforcing steel in the steel pipe is welded. object.
沿岸の水域に設けられる杭式構造物の鋼管杭の施工方法であって、
水底地盤に杭本体を立設する立設工程と、前記杭本体の天端側に杭頭構造を設ける接合工程とを備え、
前記接合工程では、前記杭頭構造において鉄筋定着用鋼板が溶接接合される接合箇所の鋼管に、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管を用いて、水底地盤に立設された前記杭本体に前記鋼管を取り付けること
を特徴とする鋼管杭の施工方法。
It is a construction method of a steel pipe pile of a pile type structure provided in a coastal water area,
A standing process of standing a pile body on the bottom of the ground, and a joining process of providing a pile head structure on the top end side of the pile body,
In the joining step, the steel pipe at the joining location where the steel plate for reinforcing bar fixing is weld-joined in the pile head structure has a drawing value in the thickness direction of 10% or more and a sulfur (S) content of 0.0% by mass. A construction method of a steel pipe pile, characterized in that the steel pipe is attached to the main body of the pile standing on the bottom of the ground using a steel pipe made of lamellar-resistant steel with a 010% or less.
沿岸の水域に設けられる杭式構造物の施工方法であって、
水底地盤に複数の杭本体を立設する立設工程と、前記杭本体の天端側に杭頭構造を設ける接合工程と、上部コンクリートの内部に前記杭頭構造を埋め込む埋設工程とを備え、
前記接合工程では、前記杭頭構造において鉄筋定着用鋼板が溶接接合される接合箇所の鋼管に、板厚方向の絞り値を10%以上、かつ、硫黄(S)含有量を質量%で0.010%以下とした耐ラメラティア鋼からなる鋼管を用いて、水底地盤に立設された前記杭本体に前記鋼管を取り付けて、
前記埋設工程では、前記鉄筋定着用鋼板に鉄筋を連結してから、前記上部コンクリートとなるコンクリートを打設して、前記上部コンクリートの内部に前記杭頭構造を埋め込むことで、前記上部コンクリートの内部で鉄筋が前記鉄筋定着用鋼板に連結されること
を特徴とする杭式構造物の施工方法
A construction method of a pile-type structure provided in a coastal water area,
A standing step of standing a plurality of pile main bodies on the water bottom ground, a joining step of providing a pile head structure on the top end side of the pile main body, and a burying step of embedding the pile head structure inside the upper concrete,
In the joining step, the steel pipe at the joining location where the steel plate for reinforcing bar fixing is weld-joined in the pile head structure has a drawing value in the thickness direction of 10% or more and a sulfur (S) content of 0.0% by mass. Using a steel pipe made of lamellar steel resistant to 010% or less, attaching the steel pipe to the pile main body standing on the bottom of the water,
In the embedding step, after connecting a reinforcing bar to the steel sheet for fixing the reinforcing bar, placing the concrete as the upper concrete and embedding the pile head structure inside the upper concrete, the interior of the upper concrete A method for constructing a pile-type structure, wherein the reinforcing bar is connected to the steel plate for fixing the reinforcing bar
JP2016226427A 2016-11-22 2016-11-22 Steel pipe pile, pile head structure, pile type construction, construction method for steel pipe pile, and construction method for pile type construction Pending JP2018084048A (en)

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