JP6360818B2 - Steel pipe concrete composite pile, its manufacturing method and pile head treatment method - Google Patents

Steel pipe concrete composite pile, its manufacturing method and pile head treatment method Download PDF

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JP6360818B2
JP6360818B2 JP2015182551A JP2015182551A JP6360818B2 JP 6360818 B2 JP6360818 B2 JP 6360818B2 JP 2015182551 A JP2015182551 A JP 2015182551A JP 2015182551 A JP2015182551 A JP 2015182551A JP 6360818 B2 JP6360818 B2 JP 6360818B2
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佐藤　啓
啓 佐藤
浩 田口
浩 田口
菅　一雅
一雅 菅
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Japan Pile Corp
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本発明は、鋼管コンクリート複合杭、その製造方法及び杭頭処理方法に関し、更に詳しくは、杭頭部と構造物の基礎とを接合する際に使用して最適な鋼管コンクリート複合杭及びその製造方法並びに杭頭部の処理方法に関する。   The present invention relates to a steel pipe concrete composite pile, a manufacturing method thereof, and a pile head processing method, and more particularly, a steel pipe concrete composite pile optimal for use when joining a pile head and a foundation of a structure and a manufacturing method thereof. Moreover, it is related with the processing method of a pile head.

鋼管コンクリート複合杭は、ＰＨＣ杭やＰＲＣ杭に比較して大きな曲げ耐力を有することから、高支持力杭等の杭頭部に作用する大きな水平力に対して耐えられるよう上杭として採用されることが増えている。   Steel pipe-concrete composite piles have higher bending strength than PHC piles and PRC piles, so they are used as upper piles to withstand large horizontal forces acting on pile heads such as high bearing capacity piles. Things are increasing.

このような鋼管コンクリート複合杭を土木構造物の基礎部に適用する場合、杭頭側のコンクリート層に構造物の基礎と接合するためのアンカー鉄筋を予め埋め込んだものが知られている（例えば特許文献１参照）。しかしながら、予めコンクリート層に埋め込んだアンカー鉄筋を杭施工後に露出させなければならず、杭頭処理に多大な手間と労力を要するといった問題点がある。   When such a steel pipe concrete composite pile is applied to the foundation part of a civil engineering structure, an anchor reinforcement for joining the foundation of the structure is embedded in a concrete layer on the pile head side is known (for example, patent) Reference 1). However, there is a problem that the anchor reinforcing bars embedded in the concrete layer in advance must be exposed after the pile construction, and a great deal of labor and labor are required for the pile head processing.

これに対し、杭頭部のコンクリート層にこれを杭頭部上部側および杭頭部下部側に仕切る仕切板とアンカー鉄筋とを有する鉄筋籠を埋め込み、杭頭部上部側のコンクリート層のアンカー鉄筋を被覆パイプで被覆しておくことで、施工後に鋼管を周方向に切断して仕切板の上方の杭頭部上部を引き抜くだけでアンカー鉄筋を露出させることができるようにした提案が知られている（特許文献２参照）。このようにすることで、鋼管の軸方向切断やコンクリート層の破壊、さらには斫り作業が全く不要となり、杭頭処理作業を極めて容易に行うことができる。   On the other hand, the reinforcing bar of the concrete layer on the pile head upper side is embedded in the concrete layer of the pile head with a reinforcing bar with a partition plate and an anchor reinforcing bar separating the pile head upper side and the pile head lower side. It is known that the steel bar can be exposed to the anchor rebar by simply cutting the steel pipe in the circumferential direction after construction and pulling out the top of the pile head above the partition plate. (See Patent Document 2). By doing in this way, the axial cutting of a steel pipe, the destruction of a concrete layer, and also the turning work become unnecessary, and the pile head processing work can be performed very easily.

特開平７ー１８６７５号公報Japanese Patent Laid-Open No. 7-18675 特許第５０３６００７号公報Japanese Patent No. 5035607

しかしながら、上記仕切板をコンクリートを投入する前の外殻鋼管内に固定するのに、作業員が鋼管の内部に入って溶接等の作業をする必要があり、杭径が６００ｍｍ以下の小径ともなると事実上製造できなかった。   However, in order to fix the partition plate in the outer shell steel pipe before putting the concrete, it is necessary for an operator to enter the inside of the steel pipe and perform work such as welding, and the pile diameter becomes a small diameter of 600 mm or less. It was virtually impossible to manufacture.

本発明は、上記のような困難を伴う技術的な背景に基づいてなされたものであって、鋼管の内部に作業員が入ることなく、鉄筋籠を所定の位置に固定できる鋼管コンクリート複合杭を提供することにある。   The present invention was made on the basis of the technical background with the above difficulties, and a steel pipe concrete composite pile capable of fixing a reinforcing bar in a predetermined position without an operator entering the inside of the steel pipe. It is to provide.

上記の課題を解決するため、本願の第１発明は、筒状の鋼管と、当該鋼管の内側に設けられて前記鋼管の内周面に当接する筒状のコンクリート層と、当該コンクリート層に一部分が埋め込まれる鉄筋籠と、当該鉄筋籠の端部に締結部材により脱着可能に取付けられる固定板とを備える鋼管コンクリート複合杭であって、
前記鉄筋籠は、前記鋼管の端面と前記固定板との間に配設されて、前記端面に固定される杭頭部端板と、前記杭頭部端板から所定距離だけ離れた前記鋼管内に設けられ、外周面が前記鋼管の内周面に当接する環状の仕切板と、前記仕切板を貫通するとゝもに、前記コンクリート層の長手方向に沿って前記コンクリート層内に埋め込まれたアンカー鉄筋と、一端部が前記仕切板に固定され、他端部が前記杭頭部端板を貫通するとゝもに、前記固定板を貫通して前記締結部材に当接する棒状の補助鋼棒と、を有し、
前記杭頭部端板から前記仕切板までの区間において、前記補助鋼棒及び前記アンカー鉄筋の外周をそれぞれ被覆する被覆材を備えており、
前記締結部材を締結すると、前記固定板は前記杭頭部端板に固定されるとゝもに、前記締結部材にて前記補助鋼棒の前記他端部が押圧されて前記固定板に固定され、前記鉄筋籠と前記鋼管とが一体化されることを特徴とする鋼管コンクリート複合杭とした。 In order to solve the above problems, a first invention of the present application includes a cylindrical steel pipe, a cylindrical concrete layer provided inside the steel pipe and in contact with an inner peripheral surface of the steel pipe, and a part of the concrete layer. Steel pipe-concrete composite pile comprising a reinforcing steel rod embedded with a fixing plate detachably attached to the end of the reinforcing steel rod by a fastening member,
The reinforcing bar is disposed between an end surface of the steel pipe and the fixing plate, and is fixed to the end surface. A pile head end plate is fixed to the end surface, and the steel pipe is separated from the pile head end plate by a predetermined distance. An annular partition plate whose outer peripheral surface is in contact with the inner peripheral surface of the steel pipe, and an anchor embedded in the concrete layer along the longitudinal direction of the concrete layer when passing through the partition plate Reinforcing bar, rod-shaped auxiliary steel bar that is fixed to the partition plate and the other end penetrates the pile head end plate, and is in contact with the fastening member through the fixed plate, Have
In the section from the pile head end plate to the partition plate, the auxiliary steel rod and the anchor reinforcing bar are each covered with a covering material,
When the fastening member is fastened, when the fixing plate is fixed to the pile head end plate, the other end portion of the auxiliary steel rod is pressed by the fastening member and fixed to the fixing plate. The steel pipe-concrete composite pile is characterized in that the steel bar and the steel pipe are integrated.

また、本願の第２発明は、前記杭頭部端板と前記固定板との間にあって、前記補助鋼棒及び前記アンカー鉄筋の外周には前記被覆材で覆われた内部と外部との連通を阻止するシール部がそれぞれ設けられており、前記シール部は、前記締結部材によって前記固定板を前記杭頭部端板に固定する際に、前記杭頭部端板の上端面よりも前記固定板側に突出する前記被覆材の上端部を、前記固定板及び前記杭頭部端板で圧潰することにより形成されたことを特徴とする鋼管コンクリート複合杭とした。   Moreover, the 2nd invention of this application is between the said pile head end plate and the said fixed board, Comprising: On the outer periphery of the said auxiliary steel bar and the said anchor reinforcement, communication with the inside and the exterior covered with the said coating | covering material is carried out. Each of the sealing portions to be blocked is provided, and the sealing portion is fixed to the fixing plate more than the upper end surface of the pile head end plate when the fixing plate is fixed to the pile head end plate by the fastening member. A steel pipe concrete composite pile was formed by crushing the upper end portion of the covering material protruding sideward with the fixed plate and the pile head end plate.

そして、本願の第３発明は、環状の仕切板に、周方向に所定の間隔をおいて設置した補助鋼棒をその下端部で、及び前記仕切板の両側に延びるアンカー鉄筋を杭頭部上部側と杭頭部下部側との境界部近傍でそれぞれ固定するとゝもに、前記補助鋼棒及び杭頭部上部側となる前記アンカー鉄筋に被覆パイプをそれぞれ被覆する工程、
前記補助鋼棒及びアンカー鉄筋の上端部を杭頭部端板の挿通孔にそれぞれ挿入するとゝもに、前記挿通孔を貫通せしめた前記補助鋼棒の加工ヘッド部を前記杭頭部端板の上に設置した固定板の定着孔に定着させて、この固定板と鉄筋籠とを組立てる工程、
前記固定板を締結部材で締結して前記杭頭部端板に固定するとゝもに、前記補助鋼棒の加工ヘッド部を前記締結部材で押圧して、前記補助鋼棒の上端部を前記固定板に固定し、前記鉄筋籠を一体化する工程、
前記固定板及び鉄筋籠を仕切板側から鋼管内に挿入し、前記杭頭部端板を鋼管の開口部に溶接により固定する工程、
前記鋼管の内部にコンクリートを供給し、遠心成形により前記鉄筋籠が埋め込まれたコンクリート層を鋼管の内周に形成する工程、
コンクリート層が硬化した後、前記固定板を取り外し、前記補助鋼棒の加工ヘッド部を除去する工程、
をそれぞれ備えたことを特徴とする鋼管コンクリート複合杭の製造方法とした。 And the third invention of the present application is that the auxiliary steel bar installed at a predetermined interval in the circumferential direction on the annular partition plate, the anchor rebar extending on both sides of the partition plate at the upper part of the pile head A step of covering each of the auxiliary steel bars and the anchor rebars on the pile head upper side with covering pipes, respectively, by fixing in the vicinity of the boundary between the side and the pile head lower side,
When the upper ends of the auxiliary steel bar and the anchor reinforcing bar are respectively inserted into the insertion holes of the pile head end plate, the processing head part of the auxiliary steel bar penetrating the insertion hole is inserted into the pile head end plate. The process of assembling the fixing plate and the reinforcing bar rod by fixing it in the fixing hole of the fixing plate installed on the top,
When the fixing plate is fastened with a fastening member and fixed to the pile head end plate, the processing head portion of the auxiliary steel rod is pressed with the fastening member to fix the upper end portion of the auxiliary steel rod. Fixing to the plate and integrating the rebar rods;
Inserting the fixing plate and the reinforcing bar into the steel pipe from the partition plate side, and fixing the pile head end plate to the opening of the steel pipe by welding;
Supplying concrete to the inside of the steel pipe, and forming a concrete layer embedded with the steel bar by centrifugal molding on the inner periphery of the steel pipe;
After the concrete layer has hardened, the step of removing the fixing plate and removing the processing head part of the auxiliary steel bar,
It was set as the manufacturing method of the steel pipe concrete composite pile characterized by including each.

更に、本願の第４発明は、前記固定板を締結部材で締結して前記杭頭部端板に固定する工程において、前記杭頭部端板の挿通孔から突出する前記被覆パイプの上端部を前記固定板と杭頭部端板とで圧潰して、前記補助鋼棒及びアンカー鉄筋を被覆する前記被覆パイプの内部と外部との連通を阻止するシール部を形成する工程を備えたことを特徴とする鋼管コンクリート複合杭の製造方法とした。   Furthermore, 4th invention of this application is the process of fastening the said fixing plate with a fastening member, and fixing to the said pile head end plate, The upper end part of the said covering pipe which protrudes from the penetration hole of the said pile head end plate is provided. Crushing with the fixing plate and the pile head end plate to provide a step of forming a seal portion that prevents communication between the inside and the outside of the covered pipe that covers the auxiliary steel rod and the anchor reinforcing bar. It was set as the manufacturing method of the steel pipe concrete composite pile.

また、本願の第５発明は、鋼管コンクリート複合杭の杭頭処理方法であって、前記鋼管コンクリート複合杭を施工現場の地盤に埋設した後、表層地盤を前記仕切板位置まで掘削するする工程、前記仕切板の位置で、前記鋼管コンクリート複合杭の鋼管を周方向に切断する工程、前記仕切板よりも上方の前記杭頭部上部側のコンクリート層及びその外周の鋼管部分を含む杭頭部上部を引き抜いて撤去し、前記杭頭部上部側のアンカー鉄筋及び補助鋼棒を露出させる工程、を備えたことを特徴とする鋼管コンクリート複合杭の杭頭処理方法とした。   Further, the fifth invention of the present application is a pile head processing method of a steel pipe concrete composite pile, and after the steel pipe concrete composite pile is embedded in the ground of a construction site, a step of excavating a surface layer ground to the partition plate position, The step of cutting the steel pipe of the steel pipe concrete composite pile in the circumferential direction at the position of the partition plate, the pile head upper portion including the concrete layer on the pile head upper side above the partition plate and the steel pipe portion on the outer periphery thereof The pile head processing method for a steel-pipe concrete composite pile, comprising: a step of extracting and removing the steel bar to expose the anchor rebar and the auxiliary steel bar on the pile head upper side.

本発明に係る鋼管コンクリート複合杭は、鉄筋籠がアンカー鉄筋、杭頭部端板および仕切板によって構成され、杭頭部の固定板と杭頭部端板との間で円周上に位置決めされ定着された補助鋼棒を介して杭頭部端板と仕切板との間で固定されることで軸方向の位置決めがされ、鉄筋籠は鋼管内の所定位置に確実に固定される。   In the steel pipe concrete composite pile according to the present invention, the reinforcing bar is composed of an anchor reinforcing bar, a pile head end plate and a partition plate, and is positioned on the circumference between the fixing plate of the pile head and the pile head end plate. By fixing between the pile head end plate and the partition plate via the fixed auxiliary steel rod, the axial positioning is performed, and the reinforcing bar is securely fixed at a predetermined position in the steel pipe.

また、杭頭部上部側コンクリート層のアンカー鉄筋及び補助鋼棒は被覆パイプでそれぞれ被覆され、この被覆パイプの上端部は前記杭頭部端板及び固定板との間でシールされていることを特徴とするから、この被覆パイプ内にセメントペーストが入ることがなく、前記杭頭部上部側のコンクリート層及びその外周の鋼管部分を含む杭頭部上部の抜き出しに支承を与えることがない。   In addition, the anchor rebar and the auxiliary steel bar of the pile head upper concrete layer are respectively covered with the covering pipe, and the upper end of the covering pipe is sealed between the pile head end plate and the fixing plate. Since it is a characteristic, cement paste does not enter into this covering pipe, and support is not given to extraction of the pile head upper part including the concrete layer on the pile head upper side and the steel pipe part on the outer periphery thereof.

また前記鋼管コンクリート複合杭の製造において、補助鋼棒、仕切板及び固定板を介して一体に形成した鉄筋籠を仕切板側から鋼管内に挿入し、杭頭部端板を鋼管の開口部に溶接により固定する方法を採用しているので、作業者が鋼管内に入って仕切板を鋼管内に溶接するなどして固定する必要がない。   Further, in the manufacture of the steel pipe concrete composite pile, a reinforcing bar made integrally through an auxiliary steel bar, a partition plate and a fixing plate is inserted into the steel pipe from the partition plate side, and the pile head end plate is inserted into the opening of the steel pipe. Since the method of fixing by welding is adopted, it is not necessary for the operator to enter the steel pipe and weld the partition plate into the steel pipe for fixing.

また、鋼管内のコンクリート層が硬化した後、前記固定板を杭頭部端板から取り外し、前記補助鋼棒の加工ヘッド部を除去した後、施工現場に配送されることから、鋼管コンクリート複合杭を地盤に埋設した後、前記仕切板の位置で前記鋼管を周方向に切断するだけで、前記仕切板よりも上方の前記杭頭部上部側のコンクリート層及びその外周の鋼管部分を含む杭頭部上部を引き抜き撤去できる。   In addition, after the concrete layer in the steel pipe has hardened, the fixed plate is removed from the pile head end plate, the processing head part of the auxiliary steel bar is removed, and then delivered to the construction site. The pile head including the concrete layer on the upper side of the pile head above the partition plate and the steel pipe portion on the outer periphery thereof just by cutting the steel pipe in the circumferential direction at the position of the partition plate after being embedded in the ground The upper part can be pulled out and removed.

本発明に係る鋼管コンクリート複合杭の杭頭部の縦断面図である。It is a longitudinal cross-sectional view of the pile head of the steel pipe concrete composite pile concerning this invention. 本発明におけるコンクリート層に埋設する鉄筋籠の縦断面図である。It is a longitudinal cross-sectional view of the reinforcing bar cage embed | buried in the concrete layer in this invention. 同上の鉄筋籠を組立てる状態を示す縦断面図である。It is a longitudinal cross-sectional view which shows the state which assembles the same reinforcing steel bar. 鉄筋籠の構成部材である杭頭部端板の平面図である。It is a top view of the pile head end plate which is a structural member of a reinforcing bar rod. 杭頭部に固定する固定板の平面図である。It is a top view of the fixed board fixed to a pile head. 鉄筋籠の一体化を図る動作説明図で、鉄筋籠の杭頭部端板の上に固定板を配置した状態を示す縦断面拡大部分図である。It is operation | movement explanatory drawing which aims at integration of a reinforcing bar, and is a longitudinal cross-section enlarged partial view which shows the state which has arrange | positioned the fixed board on the pile head end plate of a reinforcing bar. 同上の杭頭部端板から突出する補助鋼棒の加工ヘッド部が、固定板の定着孔内に収納された状態を示す縦断面拡大部分図である。It is a longitudinal cross-sectional enlarged partial view which shows the state by which the process head part of the auxiliary steel bar which protrudes from a pile head end plate same as the above was accommodated in the fixing hole of a fixed plate. 同上の杭頭部端板と固定板とがボルトの締結により一体化された状態を示す縦断面拡大部分図である。It is a longitudinal cross-section enlarged partial view which shows the state by which the same pile head end plate and fixing plate same as the above were integrated by the fastening of a volt | bolt. 杭を地盤に埋設した後、杭頭部上部側の鋼管を切断位置で周方向に切断する状態を示す杭頭処理方法の説明図である。It is explanatory drawing of the pile head processing method which shows the state which cut | disconnects the steel pipe of the pile head upper part side in the circumferential direction in a cutting position, after burying a pile in the ground. 杭頭部上部側を吊り具で吊り上げ、アンカー鉄筋および補助鋼棒が露出した状態を示す杭頭処理方法の説明図である。It is explanatory drawing of the pile head processing method which shows the state which lifted the pile head upper side with the hanger, and exposed the anchor reinforcement and the auxiliary steel bar. 鉄筋籠の作成から鋼管コンクリート複合杭の成形までを示すブロック図である。It is a block diagram which shows from creation of a reinforcing bar to formation of a steel pipe concrete composite pile. 鋼管コンクリート複合杭の施工から基礎フーチングの施工までの工程を示すブロック図である。It is a block diagram which shows the process from construction of a steel pipe concrete composite pile to construction of a foundation footing.

以下、本願発明を図面に示す実施例を参照して説明する。図において、１は本発明に係る鋼管コンクリート複合杭で、鋼管２と、該鋼管２の内周に一体化した筒状のコンクリート層３と、該コンクリート層３に埋め込まれた鉄筋籠４と、鋼管コンクリート複合杭１の杭頭部端部に設置した固定板５とから主に構成されている。   The present invention will be described below with reference to embodiments shown in the drawings. In the figure, 1 is a steel pipe concrete composite pile according to the present invention, a steel pipe 2, a cylindrical concrete layer 3 integrated on the inner periphery of the steel pipe 2, a reinforcing bar 4 embedded in the concrete layer 3, It is mainly comprised from the fixed plate 5 installed in the pile head end part of the steel pipe concrete composite pile 1. FIG.

前記鉄筋籠４は、コンクリート層３の杭頭部端面を覆う杭頭部端板６と、杭頭部上部側Ａと杭頭部下部側Ｂとに分かつ環状の仕切板７と、杭頭部上部側Ａのコンクリート層３ａ及び杭頭部下部側Ｂのコンクリート層３ｂのそれぞれに延びる複数のアンカー鉄筋８と、杭頭部上部側Ａのコンクリート層３ａの部分にのみ延びている複数の補助鋼棒９とから構成されている。   The reinforcing bar 4 is divided into a pile head end plate 6 covering the pile head end face of the concrete layer 3, a pile head upper side A and a pile head lower side B, an annular partition plate 7, and a pile head A plurality of anchor rebars 8 extending to each of the concrete layer 3a on the upper side A and the concrete layer 3b on the lower side B of the pile head, and a plurality of auxiliary steels extending only to the portion of the concrete layer 3a on the upper side A of the pile head It is composed of a bar 9.

１０は被覆パイプで、杭頭部上部側Ａのコンクリート層３ａに埋め込まれているアンカー鉄筋８の一部８Ａ及び補助鋼棒９はそれぞれ被覆パイプ１０で被覆されている。１１は杭頭部端板６に形成したアンカー鉄筋８の挿通孔で、アンカー鉄筋８の上端部８ａは挿通孔１１内に被覆パイプ１０を介して挿入されており、該被覆パイプ１０の上端部１０ａはアンカー鉄筋８の挿通孔１１から上方へ突出した状態で設置されている。   10 is a covered pipe, and a part 8A of the anchor reinforcing bar 8 and the auxiliary steel bar 9 embedded in the concrete layer 3a on the upper side A of the pile head are covered with the covered pipe 10, respectively. Reference numeral 11 denotes an insertion hole of the anchor reinforcing bar 8 formed in the pile head end plate 6, and an upper end portion 8 a of the anchor reinforcing bar 8 is inserted into the insertion hole 11 through the covering pipe 10, and the upper end portion of the covering pipe 10 10a is installed in a state protruding upward from the insertion hole 11 of the anchor reinforcing bar 8.

１２は前記杭頭部端板６に形成した補助鋼棒９の挿通孔で、補助鋼棒９の上端部９ｂは挿通孔１２内に被覆パイプ１０を介して挿入されており、この被覆パイプ１０の上端部１０ａは補助鋼棒９の挿通孔１２から上方へ突出した状態で、さらに補助鋼棒９の上端の加工ヘッド部９ａは被覆パイプ１０の上端部１０ａよりも上方へ突出した状態で挿通孔１２内に設置されている。加工ヘッド部９ａの外径は、補助鋼棒９の上端部９ｂ及び下端部９ｃの外径より大きくなるように形成されている。なお、図中１３は加工ヘッド部９ａの挿通孔１２と隣接する位置に形成したボルト穴である。   Reference numeral 12 denotes an insertion hole for the auxiliary steel rod 9 formed in the pile head end plate 6, and an upper end portion 9 b of the auxiliary steel rod 9 is inserted into the insertion hole 12 via a covering pipe 10. The upper end portion 10a of the auxiliary steel rod 9 protrudes upward from the insertion hole 12 and the processing head portion 9a of the upper end of the auxiliary steel rod 9 is inserted in a state of protruding upward from the upper end portion 10a of the coated pipe 10. It is installed in the hole 12. The outer diameter of the machining head portion 9a is formed to be larger than the outer diameters of the upper end portion 9b and the lower end portion 9c of the auxiliary steel rod 9. In the figure, reference numeral 13 denotes a bolt hole formed at a position adjacent to the insertion hole 12 of the machining head portion 9a.

１４は前記固定板５に形成した加工ヘッド部９ａの定着孔、１５はこの定着孔１４と連通するボルト穴で、このボルト穴１５と前記定着孔１４とは所謂ダルマ孔状に形成したものである。１６は固定ボルトで、固定板５のボルト穴１５と杭頭部端板６のボルト穴１３とを合致させた状態で螺合させ、これを締め付けることで固定板５と杭頭部端板６とを一体に連結する手段として使用するものである。   14 is a fixing hole of the processing head portion 9a formed in the fixing plate 5, 15 is a bolt hole communicating with the fixing hole 14, and the bolt hole 15 and the fixing hole 14 are formed in a so-called Dharma hole shape. is there. Reference numeral 16 denotes a fixing bolt, which is screwed in a state where the bolt hole 15 of the fixing plate 5 and the bolt hole 13 of the pile head end plate 6 are matched, and tightened to fix the fixing plate 5 and the pile head end plate 6. Are used as means for connecting the two together.

前記定着孔１４は、杭頭部端板６側の径よりも杭頭部端板６側と反対側の外方側の径が大きく形成されている。具体的には、杭頭部端板６側の径、外方側の径はそれぞれ補助鋼棒９の上端部９ｂ、加工ヘッド部９ａを収納可能な大きさである。さらに、定着孔１４の外方側の深さは、加工ヘッド部９ａの軸方向の長さと略同一である。すなわち、加工ヘッド部９ａを固定板５の定着孔１４内に収納した際に、加工ヘッド部９ａの上端が固定板５の上端面とほぼ一致する。   The fixing hole 14 has a diameter on the outer side opposite to the pile head end plate 6 side larger than the diameter on the pile head end plate 6 side. Specifically, the diameter on the pile head end plate 6 side and the diameter on the outer side are large enough to accommodate the upper end portion 9b and the machining head portion 9a of the auxiliary steel rod 9, respectively. Further, the outer depth of the fixing hole 14 is substantially the same as the axial length of the machining head portion 9a. That is, when the processing head portion 9 a is stored in the fixing hole 14 of the fixed plate 5, the upper end of the processing head portion 9 a substantially coincides with the upper end surface of the fixed plate 5.

つぎに、前記鋼管コンクリート複合杭１の製造方法について説明する。   Below, the manufacturing method of the said steel pipe concrete composite pile 1 is demonstrated.

（一）鉄筋籠４の組み立て
（１）仕切板７に設けた取付孔７ａに補助鋼棒９の下端部９ｃを差し込む。また周方向
に前記取付孔７ａと所定の間隔をおいて設けた挿通孔７ｂにアンカー鉄筋８を挿入し
て貫通させ、杭頭部上部側Ａと杭頭部下部側Ｂとの境界部近傍まで挿通させる。そし
て、補助鋼棒９の下端部９ｃ及びアンカー鉄筋８の前記境界部近傍を取付孔７ａ及び
挿通孔７ｂの部分で前記仕切板７に溶接により固定する。なお、図中１７は杭頭部下
部側Ｂのコンクリート層３ｂに埋め込まれるアンカー鉄筋８Ｂの下端部８ｂに溶接に
より固定した環状筋である。
（２）補助鋼棒９及びアンカー鉄筋８の杭頭部上部側Ａとなるアンカー鉄筋８Ａの外周
に被覆パイプ１０をそれぞれ装着する。なお、杭頭部下部側Ｂとなるアンカー鉄筋８
Ｂの下端部８ｂに環状筋１７を固定する溶接作業は、アンカー鉄筋８Ａに被覆パイプ
１０を被覆する前或いは後であってもよい。
（３）補助鋼棒９の上端部９ｂ及びアンカー鉄筋８の上端部８ａを杭頭部端板６の挿通
孔１１，１２にそれぞれ挿入する。この挿入時、被覆パイプ１０の上端部１０ａは前
記挿通孔１１，１２から上方へ突出した状態で、そして、前記補助鋼棒９の上端部９
ｂの加工ヘッド部９ａは前記被覆パイプ１０の上端部１０ａよりも上方へ突出した状
態で挿通孔１２内に設置される。 (1) Assembling of the reinforcing bar 4 (1) Insert the lower end portion 9c of the auxiliary steel rod 9 into the mounting hole 7a provided in the partition plate 7. In addition, the anchor rebar 8 is inserted through the insertion hole 7b provided at a predetermined distance from the mounting hole 7a in the circumferential direction and penetrated to the vicinity of the boundary between the pile head upper side A and the pile head lower side B. Insert. Then, the lower end portion 9c of the auxiliary steel rod 9 and the vicinity of the boundary portion of the anchor reinforcing bar 8 are fixed to the partition plate 7 by welding at portions of the attachment hole 7a and the insertion hole 7b. In the figure, 17 is an annular bar fixed by welding to the lower end 8b of the anchor reinforcing bar 8B embedded in the concrete layer 3b on the lower part B side of the pile head.
(2) The covering pipes 10 are respectively mounted on the outer circumferences of the anchor reinforcing bars 8A which are the pile head upper side A of the auxiliary steel bars 9 and the anchor reinforcing bars 8. In addition, anchor reinforcement 8 which becomes pile head lower part side B
The welding operation for fixing the annular reinforcing bar 17 to the lower end 8b of B may be before or after the covering pipe 10 is covered with the anchor reinforcing bar 8A.
(3) Insert the upper end 9b of the auxiliary steel bar 9 and the upper end 8a of the anchor reinforcing bar 8 into the insertion holes 11 and 12 of the pile head end plate 6, respectively. At the time of this insertion, the upper end portion 10a of the covering pipe 10 protrudes upward from the insertion holes 11 and 12, and the upper end portion 9 of the auxiliary steel rod 9
The processing head portion 9a of b is installed in the insertion hole 12 in a state of protruding upward from the upper end portion 10a of the covering pipe 10.

（二）鉄筋籠４の一体連結化
（１）杭頭部端板６の上方に固定板５を配設し、補助鋼棒９の加工ヘッド部９ａと固定
板５のボルト穴１５とを合致させる（図６参照）。固定板５を杭頭部端板６方向（図
６中の矢印方向）に移動させ、ボルト穴１５を貫通させる。続けて、固定板５の下端
面が被覆パイプ１０の上端面に当接したら固定板５を所定の方向（図７の矢印方向）
へ回転させる。固定板５を回転させることにより、加工ヘッド部９ａを固定板５の定
着孔１４に定着させる。これにより、固定板５のボルト穴１５と杭頭部端板６のボル
ト穴１３とが合致する（図７参照）。
（２）固定板５と杭頭部端板６の合致したボルト穴１５，１３に固定ボルト１６を螺合
させこれを締め付ける。固定ボルト１６の締め付けで、固定板５と杭頭部端板６とは
一体的に固定されるとゝもに、固定ボルト１６の頭部下面１６ａで補助鋼棒９の加工
ヘッド部９ａが上方から杭頭部端板６方向に押さえ付けられる（図８参照）。
（３）固定ボルト１６を締め付けることで、補助鋼棒９の上端部９ｂの加工ヘッド部９
ａが固定板５の定着孔１４内に固定される。他方、補助鋼棒９の下端部９ｃは仕切板
７に溶接により固定されているので、鉄筋籠４は補助鋼棒９を介して固定板５および
杭頭部端板６に一体的に連結される。
（４）同時に、挿通孔１１，１２から上方へ突出した状態で組み立てられていた被覆パ
イプ１０の上端部１０ａは圧潰されて、固定板５と杭頭部端板６とはその接合面が密
着状態で連結される。この圧潰された部分が挿通孔１１，１２周辺のシール部として
の機能を有する。 (2) Reinforcement rod 4 integrated connection (1) The fixed plate 5 is disposed above the pile head end plate 6 and the machining head portion 9a of the auxiliary steel bar 9 and the bolt hole 15 of the fixed plate 5 are matched. (See FIG. 6). The fixing plate 5 is moved in the direction of the pile head end plate 6 (in the direction of the arrow in FIG. 6), and the bolt hole 15 is penetrated. Subsequently, when the lower end surface of the fixing plate 5 comes into contact with the upper end surface of the coated pipe 10, the fixing plate 5 is moved in a predetermined direction (the arrow direction in FIG. 7).
Rotate to By rotating the fixing plate 5, the processing head portion 9 a is fixed to the fixing hole 14 of the fixing plate 5. Thereby, the bolt hole 15 of the fixing plate 5 and the bolt hole 13 of the pile head end plate 6 match (see FIG. 7).
(2) The fixing bolt 16 is screwed into the bolt holes 15 and 13 which are aligned with each other on the fixing plate 5 and the pile head end plate 6 and tightened. When the fixing plate 5 and the pile head end plate 6 are fixed together by tightening the fixing bolt 16, the head portion 9a of the auxiliary steel rod 9 is moved upward by the head lower surface 16a of the fixing bolt 16. To the pile head end plate 6 (see FIG. 8).
(3) By tightening the fixing bolt 16, the machining head portion 9 of the upper end portion 9b of the auxiliary steel rod 9 is obtained.
a is fixed in the fixing hole 14 of the fixing plate 5. On the other hand, since the lower end portion 9c of the auxiliary steel bar 9 is fixed to the partition plate 7 by welding, the reinforcing bar 4 is integrally connected to the fixing plate 5 and the pile head end plate 6 via the auxiliary steel bar 9. The
(4) At the same time, the upper end portion 10a of the covering pipe 10 assembled in a state of protruding upward from the insertion holes 11 and 12 is crushed, and the joint surface between the fixing plate 5 and the pile head end plate 6 is the same. Connected in close contact. This crushed portion functions as a seal portion around the insertion holes 11 and 12.

（三）鉄筋籠４の鋼管２への設置
（１）一体構造となるよう固定された鉄筋籠４を、環状筋１７側から鋼管２内に挿入し
、環状筋１７の外周部分ではスペーサー１８を、仕切板７ではその外周面が鋼管２の
内周面と当接せることで、鋼管２の中心軸と鉄筋籠４の中心軸とを合致させることが
できる。また、鉄筋籠４の下方部は鋼管２の中心軸と直行する水平方向の位置決めが
なされる。すなわち、仕切板７を予め設計等にて設定された切断位置１９（図９参照
）よりも下方の所定の位置に配置することができる。
（２）鉄筋籠４を所定位置まで鋼管２内に挿入した後、杭頭部端板６を鋼管２の端面に
溶接により固定する。これにより、鉄筋籠４は鋼管２の軸方向の上下の位置決めがな
され、杭頭部上部の所定の位置に固定される。 (3) Installation of the reinforcing bar 4 on the steel pipe 2 (1) Insert the reinforcing bar 4 fixed so as to form an integral structure into the steel pipe 2 from the annular bar 17 side. In addition, the outer peripheral surface of the partition plate 7 is brought into contact with the inner peripheral surface of the steel pipe 2, whereby the central axis of the steel pipe 2 and the central axis of the reinforcing bar 4 can be matched. The lower part of the reinforcing bar 4 is positioned in the horizontal direction perpendicular to the central axis of the steel pipe 2. That is, the partition plate 7 can be disposed at a predetermined position below the cutting position 19 (see FIG. 9) set in advance by design or the like.
(2) After the reinforcing bar 4 is inserted into the steel pipe 2 to a predetermined position, the pile head end plate 6 is fixed to the end surface of the steel pipe 2 by welding. As a result, the reinforcing bar 4 is positioned vertically in the axial direction of the steel pipe 2 and is fixed at a predetermined position above the pile head.

（四）コンクリート層の遠心成形
（１）鋼管２の内部にコンクリートを供給し、遠心成形により杭頭部上部の所定の位置
に鉄筋籠４が埋め込まれたコンクリート層３を鋼管２の内周に形成する。
（２）コンクリート層８が硬化した後、固定板５を鉄筋籠４の杭頭部端板６から取り外
し、補助鋼棒９の加工ヘッド部９ａを除去する。 (4) Centrifugal forming of concrete layer (1) Concrete is supplied to the inside of the steel pipe 2, and the concrete layer 3 in which the reinforcing bar 4 is embedded at a predetermined position on the top of the pile head is formed on the inner circumference of the steel pipe 2 by centrifugal forming. Form.
(2) After the concrete layer 8 is hardened, the fixing plate 5 is removed from the pile head end plate 6 of the reinforcing bar 4, and the machining head portion 9a of the auxiliary steel bar 9 is removed.

つぎに、前記鋼管コンクリート複合杭１の杭頭処理方法を説明する。     Below, the pile head processing method of the said steel pipe concrete composite pile 1 is demonstrated.

（１）鋼管コンクリート複合杭１を地盤Ｇに埋設する。その後、表層地盤を仕切板７の 位置まで掘削し、鋼管２を切断位置１９で周方向に切断する。
（２）仕切板７よりも上方の杭頭部上部側Ａのコンクリート層３ａ及びその外周の鋼管
部分を含む杭頭部上部を引き抜いて撤去し、杭頭部上部側Ａのアンカー鉄筋８Ａおよ
び補助鋼棒９を露出させる。 (1) The steel pipe concrete composite pile 1 is buried in the ground G. Thereafter, the surface layer ground is excavated to the position of the partition plate 7, and the steel pipe 2 is cut in the circumferential direction at the cutting position 19.
(2) The pile head upper part including the concrete layer 3a on the pile head upper side A above the partition plate 7 and the steel pipe portion on the outer periphery thereof is pulled out and removed, and the anchor reinforcing bars 8A on the pile head upper side A and And the auxiliary steel bar 9 is exposed.

上述したように、本実施形態では、締結部材として固定ボルト１６を用いた場合について説明したが、これに限定されるものではなく、小ネジ、タッピンネジ、ピン等を用いてもよい。また、本実施形態では、被覆材として被覆パイプ１０を用いた場合について説明したが、これに限定されるものではなく、補助鋼棒９に当接する面に摩擦抵抗を低減する油脂等の摩擦低減剤が塗布された不織布等を用いても良い。要は、補助鋼棒９との付着を容易に解消できるものであればよい。   As described above, in this embodiment, the case where the fixing bolt 16 is used as the fastening member has been described. However, the present invention is not limited to this, and a small screw, a tapping screw, a pin, or the like may be used. Moreover, although this embodiment demonstrated the case where the covering pipe 10 was used as a coating | covering material, it is not limited to this, The friction reduction of oil etc. which reduces friction resistance to the surface contact | abutted to the auxiliary steel rod 9 You may use the nonwoven fabric etc. which the agent was apply | coated. In short, any material that can easily eliminate adhesion to the auxiliary steel rod 9 may be used.

１ 鋼管コンクリート複合杭
Ａ 杭頭部上部側
Ｂ 杭頭部下部側
２ 鋼管
３ コンクリート層
３ａ 杭頭部上部側のコンクリート層
３ｂ 杭頭部下部側のコンクリート層
４ 鉄筋籠
５ 固定板
６ 杭頭部端板
７ 仕切板
７ａ 取付孔
７ｂ 挿通孔
８ アンカー鉄筋
８Ａ 杭頭部上部側
８ａ アンカー鉄筋の上端部
８Ｂ 杭頭部上部側
８ｂ アンカー鉄筋の下端部
９ 補助鋼棒
９ａ 加工ヘッド部
９ｂ 上端部
９ｃ 下端部
１０ 被覆パイプ
１０ａ 上端部
１１，１２ 挿通孔
１３ ボルト穴
１４ 定着孔
１５ ボルト穴
１６ 固定ボルト
１６ａ 頭部下面
１７ 環状筋
１８ スペーサ DESCRIPTION OF SYMBOLS 1 Steel pipe concrete composite pile A A pile head upper side B Pile head lower side 2 Steel pipe 3 Concrete layer 3a Pile head upper side concrete layer 3b Pile head lower side concrete layer 4 Reinforcement rod 5 Fixing plate 6 Pile head End plate 7 Partition plate 7a Mounting hole 7b Insertion hole 8 Anchor rebar 8A Pile head upper side 8a Anchor rebar upper end 8B Pile head upper side 8b Anchor rebar lower end 9 Auxiliary steel bar 9a Processing head 9b Upper end 9c Lower end 10 Covered pipe 10a Upper end 11, 12 Insertion hole 13 Bolt hole 14 Fixing hole 15 Bolt hole 16 Fixing bolt 16a Head lower surface 17 Annulus 18 Spacer

Claims (5)

筒状の鋼管と、当該鋼管の内側に設けられて前記鋼管の内周面に当接する筒状のコンクリート層と、当該コンクリート層に一部分が埋め込まれる鉄筋籠と、当該鉄筋籠の端部に締結部材により脱着可能に取付けられる固定板とを備える鋼管コンクリート複合杭であって、
前記鉄筋籠は、前記鋼管の端面と前記固定板との間に配設されて、前記端面に固定される杭頭部端板と、前記杭頭部端板から所定距離だけ離れた前記鋼管内に設けられ、外周面が前記鋼管の内周面に当接する環状の仕切板と、前記仕切板を貫通するとゝもに、前記コンクリート層の長手方向に沿って前記コンクリート層内に埋め込まれたアンカー鉄筋と、一端部が前記仕切板に固定され、他端部が前記杭頭部端板を貫通するとゝもに、前記固定板を貫通して前記締結部材に当接する棒状の補助鋼棒と、を有し、
前記杭頭部端板から前記仕切板までの区間において、前記補助鋼棒及び前記アンカー鉄筋の外周をそれぞれ被覆する被覆材を備えており、
前記締結部材を締結すると、前記固定板は前記杭頭部端板に固定されるとゝもに、前記締結部材にて前記補助鋼棒の前記他端部が押圧されて前記固定板に固定され、前記鉄筋籠と前記鋼管とが一体化されることを特徴とする鋼管コンクリート複合杭。 Fastened to a tubular steel pipe, a cylindrical concrete layer that is provided inside the steel pipe and abuts against the inner peripheral surface of the steel pipe, a reinforcing bar that is partially embedded in the concrete layer, and an end of the reinforcing bar A steel pipe concrete composite pile comprising a fixing plate detachably attached by a member,
The reinforcing bar is disposed between an end surface of the steel pipe and the fixing plate, and is fixed to the end surface. A pile head end plate is fixed to the end surface, and the steel pipe is separated from the pile head end plate by a predetermined distance. An annular partition plate whose outer peripheral surface is in contact with the inner peripheral surface of the steel pipe, and an anchor embedded in the concrete layer along the longitudinal direction of the concrete layer when passing through the partition plate Reinforcing bar, rod-shaped auxiliary steel bar that is fixed to the partition plate and the other end penetrates the pile head end plate, and is in contact with the fastening member through the fixed plate, Have
In the section from the pile head end plate to the partition plate, the auxiliary steel rod and the anchor reinforcing bar are each covered with a covering material,
When the fastening member is fastened, when the fixing plate is fixed to the pile head end plate, the other end portion of the auxiliary steel rod is pressed by the fastening member and fixed to the fixing plate. The steel pipe-concrete composite pile, wherein the steel bar and the steel pipe are integrated. 前記杭頭部端板と前記固定板との間にあって、前記補助鋼棒及び前記アンカー鉄筋の外周には前記被覆材で覆われた内部と外部との連通を阻止するシール部がそれぞれ設けられており、
前記シール部は、前記締結部材によって前記固定板を前記杭頭部端板に固定する際に、前記杭頭部端板の上端面よりも前記固定板側に突出する前記被覆材の上端部を、前記固定板及び前記杭頭部端板で圧潰することにより形成されたことを特徴とする請求項１記載の鋼管コンクリート複合杭。 A seal portion is provided between the pile head end plate and the fixed plate, and the outer steel rod and the anchor reinforcing bar are provided with seal portions for preventing communication between the inside and the outside covered with the covering material. And
When the fixing member fixes the fixing plate to the pile head end plate by the fastening member, the seal portion includes an upper end portion of the covering material that protrudes to the fixing plate side from an upper end surface of the pile head end plate. The steel pipe concrete composite pile according to claim 1, wherein the pile is formed by crushing with the fixed plate and the pile head end plate. 環状の仕切板に、周方向に所定の間隔をおいて設置した補助鋼棒をその下端部で、及び前記仕切板の両側に延びるアンカー鉄筋を杭頭部上部側と杭頭部下部側との境界部近傍でそれぞれ固定するとゝもに、前記補助鋼棒及び杭頭部上部側となる前記アンカー鉄筋に被覆パイプをそれぞれ被覆する工程、
前記補助鋼棒及びアンカー鉄筋の上端部を杭頭部端板の挿通孔にそれぞれ挿入するとゝもに、前記挿通孔を貫通せしめた前記補助鋼棒の加工ヘッド部を前記杭頭部端板の上に設置した固定板の定着孔に定着させて、この固定板と鉄筋籠とを組立てる工程、
前記固定板を締結部材で締結して前記杭頭部端板に固定するとゝもに、前記補助鋼棒の加工ヘッド部を前記締結部材で押圧して前記補助鋼棒の上端部を前記固定板に固定し、前記鉄筋籠を一体化する工程、
前記固定板及び鉄筋籠を仕切板側から鋼管内に挿入し、前記杭頭部端板を鋼管の開口部に溶接により固定する工程、
前記鋼管の内部にコンクリートを供給し、遠心成形により前記鉄筋籠が埋め込まれたコンクリート層を鋼管の内周に形成する工程、
コンクリート層が硬化した後、前記固定板を取り外し、前記補助鋼棒の加工ヘッド部を除去する工程、
をそれぞれ備えたことを特徴とする鋼管コンクリート複合杭の製造方法。 An auxiliary steel bar installed at a predetermined interval in the circumferential direction on an annular partition plate at its lower end, and anchor reinforcing bars extending on both sides of the partition plate between the pile head upper side and the pile head lower side Steps of covering the anchor rebars on the auxiliary steel bars and the pile head upper side, respectively, with covering pipes when fixed in the vicinity of the boundary portions,
When the upper ends of the auxiliary steel bar and the anchor reinforcing bar are respectively inserted into the insertion holes of the pile head end plate, the processing head part of the auxiliary steel bar penetrating the insertion hole is inserted into the pile head end plate. The process of assembling the fixing plate and the reinforcing bar rod by fixing it in the fixing hole of the fixing plate installed on the top,
When the fixing plate is fastened with a fastening member and fixed to the pile head end plate, the processing head portion of the auxiliary steel rod is pressed with the fastening member to fix the upper end portion of the auxiliary steel rod to the fixing plate. Fixing the reinforcing bar rod to a single piece,
Inserting the fixing plate and the reinforcing bar into the steel pipe from the partition plate side, and fixing the pile head end plate to the opening of the steel pipe by welding;
Supplying concrete to the inside of the steel pipe, and forming a concrete layer embedded with the steel bar by centrifugal molding on the inner periphery of the steel pipe;
After the concrete layer has hardened, the step of removing the fixing plate and removing the processing head part of the auxiliary steel bar,
A method for producing a steel-pipe concrete composite pile characterized by comprising: 前記固定板を締結部材で締結して前記杭頭部端板に固定する工程において、前記杭頭部端板の挿通孔から突出する前記被覆パイプの上端部を前記固定板と杭頭部端板とで圧潰して、前記補助鋼棒及びアンカー鉄筋を被覆する前記被覆パイプの内部と外部との連通を阻止するシール部を形成する工程を備えたことを特徴とする請求項３記載の鋼管コンクリート複合杭の製造方法。   In the step of fastening the fixing plate with a fastening member and fixing the fixing plate to the pile head end plate, the upper end portion of the covering pipe protruding from the insertion hole of the pile head end plate is the fixing plate and the pile head end plate. The steel pipe concrete according to claim 3, further comprising a step of forming a seal portion for preventing communication between the inside and the outside of the covered pipe covering the auxiliary steel rod and the anchor reinforcing bar. Manufacturing method of composite pile. 請求項１，２のいずれかに記載の鋼管コンクリート複合杭の杭頭処理方法であって、 前記鋼管コンクリート複合杭を施工現場の地盤に埋設した後、表層地盤を前記仕切板位置まで掘削するする工程、
前記仕切板の位置で、前記鋼管コンクリート複合杭の鋼管を周方向に切断する工程、
前記仕切板よりも上方の前記杭頭部上部側のコンクリート層及びその外周の鋼管部分を含む杭頭部上部を引き抜いて撤去し、前記杭頭部上部側のアンカー鉄筋及び補助鋼棒を露出させる工程、
を備えたことを特徴とする鋼管コンクリート複合杭の杭頭処理方法。 It is a pile head processing method of the steel pipe concrete composite pile according to any one of claims 1 and 2, and after excavating the steel pipe concrete composite pile in the ground of a construction site, excavating the surface layer ground to the partition plate position. Process,
Cutting the steel pipe of the steel pipe concrete composite pile in the circumferential direction at the position of the partition plate;
The pile head upper part including the concrete layer on the pile head upper side above the partition plate and the steel pipe part on the outer periphery thereof is pulled out and removed to expose the anchor reinforcing bars and auxiliary steel bars on the pile head upper side. Process,
The pile head processing method of the steel pipe concrete composite pile characterized by having provided.
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