JP2013163967A - Junction structure of steel pipe and footing and steel pipe/concrete composite structural pier using the same - Google Patents

Junction structure of steel pipe and footing and steel pipe/concrete composite structural pier using the same Download PDF

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JP2013163967A
JP2013163967A JP2013082257A JP2013082257A JP2013163967A JP 2013163967 A JP2013163967 A JP 2013163967A JP 2013082257 A JP2013082257 A JP 2013082257A JP 2013082257 A JP2013082257 A JP 2013082257A JP 2013163967 A JP2013163967 A JP 2013163967A
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steel pipe
footing
concrete
hollow steel
pier
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JP6180775B2 (en
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Toshiaki Kato
敏明 加藤
Keiichi Aoki
圭一 青木
Takeshi Hirose
剛 広瀬
Toru Makita
通 牧田
Soshi Oshiro
壮司 大城
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Obayashi Corp
West Nippon Expressway Co Ltd
Central Nippon Expressway Co Ltd
East Nippon Expressway Co Ltd
Nippon Expressway Research Institute Co Ltd
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Obayashi Corp
West Nippon Expressway Co Ltd
Central Nippon Expressway Co Ltd
East Nippon Expressway Co Ltd
Nippon Expressway Research Institute Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To fix a leg of a hollow steel pipe to a footing with high strength, to be excellent in workability and to reduce a manufacturing cost of the hollow steel pipe.SOLUTION: For a junction structure 21 of a hollow steel pipe and a footing according to the present invention, a hollow steel pipe 6 is joined to the footing so that the lower end thereof is buried in the footing 3, a communication hole 23 for communicating the inside and outside of the hollow steel pipe 6 is provided in a range to be buried in the footing 3 in a pipe wall 22 of the hollow steel pipe, and concrete 24 inside the hollow steel pipe 6 and concrete 25 spread around the hollow steel pipe are integrated through concrete 31 filled in the communication hole.

Description

本発明は、主として高橋脚に適用される鋼管とフーチングの接合構造及びそれを用いた鋼管・コンクリート複合構造橋脚に関する。   The present invention relates to a steel pipe and footing joint structure mainly applied to a high pier and a steel pipe / concrete composite structure pier using the same.

橋脚を構築するにあたり、高さの低い橋脚であればともかく、高橋脚を鉄筋コンクリート構造で構築しようとすると、輻輳する鉄筋の配筋作業や型枠の組立及び撤去作業に多くの時間を要するため、高強度と急速施工の要請に応えることができない。   When building a pier, it is necessary to build a high pier with a reinforced concrete structure, regardless of whether it is a low pier. It cannot meet the demand for high strength and rapid construction.

そのため、中空鋼管とその周囲に打設形成されたコンクリート体とからなる鋼管・コンクリート複合構造橋脚を滑動型枠装置を用いて構築する施工方法が広く採用されており、かかる施工方法によれば、溶接による接合が容易でなおかつ曲げ及びせん断耐力が大きい中空鋼管に鉄筋の一部を代替させることで該鉄筋の配筋量を少なくするとともに、先行建込みされた中空鋼管に滑動型枠装置を吊り下げることでスリップフォーム工法による施工を行い、さらには、横筋としてＰＣストランドを採用することにより、巻付け機による効率的な巻付けが可能となるため、高橋脚を急速施工することができる。   Therefore, a construction method for constructing a steel pipe / concrete composite structure pier composed of a hollow steel pipe and a concrete body cast around it has been widely adopted using a sliding formwork device, and according to such a construction method, By replacing a part of the reinforcing bar with a hollow steel pipe that is easy to join by welding and has a large bending and shear strength, the amount of reinforcing bar is reduced, and the sliding formwork device is suspended on the hollow steel pipe that has been built in advance. By lowering, construction by the slip form method is performed, and furthermore, by adopting the PC strand as the transverse line, efficient winding by the winding machine is possible, so that the high pier can be rapidly constructed.

特許第２５９１４２２号公報Japanese Patent No. 2591422

このように、橋脚本体については、中空鋼管やＰＣストランドを用いつつ、スリップフォーム工法で施工することにより、鉄筋工事、型枠工事及びコンクリート工事の作業性を格段に向上させることができる。   Thus, about a bridge pier main body, the workability | operativity of a reinforcing bar construction, a formwork construction, and concrete construction can be improved markedly by constructing by a slip form method, using a hollow steel pipe or PC strand.

一方、中空鋼管とフーチングとが取り合う箇所では、中空鋼管の周囲に補強筋を配置した上、該補強筋を取り囲むように建て込まれた型枠内にコンクリートを打設するという一般的な鉄筋コンクリート工事の手順で施工が行われるが、高橋脚の場合、脚部に生じる曲げモーメントや引抜き力が大きくなり、その分、中空鋼管とフーチングの接合部に高い強度が要求される。   On the other hand, in a place where the hollow steel pipe and the footing meet, a reinforcing bar is placed around the hollow steel pipe, and then concrete is laid in a formwork that is built around the reinforcing bar. In the case of a high pier, the bending moment and pulling force generated in the leg portion are increased, and accordingly, a high strength is required for the joint portion between the hollow steel pipe and the footing.

しかしながら、橋脚の高さに見合った定着強度を得るには、特許文献１に記載されているように、中空鋼管のうち、フーチングに埋設される範囲に、ピッチ４０ｍｍ程度以下、高さ２．５ｍｍ程度以上のスパイラル状のリブを外周面に突設するとともに、該リブに対向するように、縦筋及びスパイラル筋からなる補強筋を中空鋼管の周囲に配筋しなければならず、それゆえ、中空鋼管の周囲で鉄筋が複雑に交錯し、フーチングの鉄筋コンクリート工事に時間がかかるという問題や、中空鋼管の製作コストが高くなるという問題を生じていた。   However, in order to obtain a fixing strength commensurate with the height of the pier, as described in Patent Document 1, a pitch of about 40 mm or less and a height of 2.5 mm is set in a hollow steel pipe embedded in a footing. Spiral ribs of a degree or more protrude from the outer peripheral surface, and reinforcing bars composed of vertical bars and spiral bars must be arranged around the hollow steel pipe so as to face the ribs. Reinforcing bars are complexly mixed around the hollow steel pipe, and it takes time for the reinforced concrete work of the footing, and the manufacturing cost of the hollow steel pipe increases.

本発明は、上述した事情を考慮してなされたもので、中空鋼管の脚部を高い強度でフーチングに定着可能で作業性にも優れなおかつ中空鋼管の製作コストを低減可能な鋼管とフーチングの接合構造及びそれを用いた鋼管・コンクリート複合構造橋脚を提供することを目的とする。   The present invention has been made in consideration of the above-described circumstances, and it is possible to fix a leg portion of a hollow steel pipe to a footing with high strength, to have excellent workability, and to reduce the manufacturing cost of the hollow steel pipe and the footing. The object is to provide a structure and a steel pipe / concrete composite pier using the same.

上記目的を達成するため、本発明に係る鋼管とフーチングの接合構造は請求項１に記載したように、中空鋼管をその下端がフーチングに埋設されるように該フーチングに接合してなる鋼管とフーチングの接合構造において、
前記中空鋼管の管壁のうち、前記フーチングに埋設される範囲に該中空鋼管の内外を連通させる連通孔を設けるとともに、該連通孔に満たされたコンクリートを介して前記中空鋼管内のコンクリートと該中空鋼管の周囲に拡がるコンクリートとを一体化させたものである。 In order to achieve the above object, the steel pipe and footing joint structure according to the present invention is a steel pipe and footing formed by joining a hollow steel pipe to the footing so that the lower end thereof is embedded in the footing. In the joining structure of
A communication hole for communicating the inside and the outside of the hollow steel pipe is provided in a range of the pipe wall of the hollow steel pipe that is embedded in the footing, and the concrete in the hollow steel pipe is connected to the concrete through the concrete filled in the communication hole. It is made by integrating concrete that spreads around the hollow steel pipe.

また、本発明に係る鋼管とフーチングの接合構造は、前記連通孔にロッド状部材を挿通配置したものである。   Moreover, the joining structure of the steel pipe and footing which concerns on this invention inserts and arrange | positions a rod-shaped member in the said communicating hole.

また、本発明に係る鋼管・コンクリート複合構造橋脚は、フーチングと該フーチングに立設された橋脚本体とを備えるとともに、該橋脚本体を、鋼管群として複数立設された中空鋼管とそれらの周囲に配置されたコンクリート体とで構成した鋼管・コンクリート複合構造橋脚において、
前記中空鋼管と前記フーチングとの接合部を請求項１又は請求項２記載の鋼管とフーチングの接合構造を用いて構成したものである。 Moreover, the steel pipe / concrete composite structure pier according to the present invention includes a footing and a pier main body standing upright on the footing, and a plurality of the steel pier main body as a steel pipe group and around the hollow steel pipes. In steel pipe / concrete composite structure pier composed of placed concrete body,
The joining part of the said hollow steel pipe and the said footing is comprised using the joining structure of the steel pipe and the footing of Claim 1 or Claim 2.

本発明に係る鋼管とフーチングの接合構造においては、中空鋼管をその下端がフーチングに埋設されるように該フーチングに接合するにあたり、中空鋼管の管壁のうち、フーチングに埋設される範囲に該中空鋼管の内外を連通させる連通孔を設けるとともに、該連通孔に満たされたコンクリートを介して中空鋼管内のコンクリートと該中空鋼管の周囲に拡がるコンクリートとを一体化させてある。   In the joining structure of the steel pipe and the footing according to the present invention, when the hollow steel pipe is joined to the footing so that the lower end thereof is buried in the footing, the hollow steel pipe is hollowed within the range buried in the footing. A communication hole for communicating the inside and the outside of the steel pipe is provided, and the concrete in the hollow steel pipe and the concrete spreading around the hollow steel pipe are integrated through the concrete filled in the communication hole.

このようにすると、中空鋼管に引抜き又は曲げによる引張力が作用したとき、中空鋼管には、その外周面のみならず、内周面にもコンクリートからの付着応力が作用するとともに、連通孔に満たされたコンクリートが、それに一体化された中空鋼管内外のコンクリートに対してせん断抵抗するため、従来のように、リブ付き鋼管を用いたりその周囲に補強筋を配置したりせずとも、中空鋼管を高い強度でフーチングに定着することができる。   In this way, when a pulling or bending tensile force is applied to the hollow steel pipe, not only the outer peripheral surface but also the inner peripheral surface of the hollow steel pipe is subjected to the adhesion stress from the concrete and the communication hole is filled. Since the applied concrete has shear resistance against the concrete inside and outside the hollow steel pipe integrated therein, the hollow steel pipe can be removed without using a ribbed steel pipe or placing reinforcing bars around it. It can be fixed to the footing with high strength.

加えて、中空鋼管の内部空間のうち、フーチングに埋設される範囲には、中空鋼管の管壁に応力集中が生じて局部座屈を生じることがないよう、コンクリートを充填して剛性を高める必要があるが、上述のように構成すれば、コンクリート打設の際、連通孔を介してコンクリートを流出入させることができるため、中空鋼管内へのコンクリートの充填性や作業性を高めることも可能となる。   In addition, in the inner space of the hollow steel pipe, the area embedded in the footing must be filled with concrete to increase rigidity so that stress concentration does not occur on the pipe wall of the hollow steel pipe and local buckling occurs. However, if it is configured as described above, it is possible to allow concrete to flow in and out through the communication holes when placing concrete, so it is possible to improve the filling and workability of the concrete into the hollow steel pipe. It becomes.

ここで、フーチングへの中空鋼管の定着強度が上述の構成では十分でない場合、上述の連通孔にロッド状部材を挿通配置した構成を採用することができる。   Here, when the fixing strength of the hollow steel pipe to the footing is not sufficient with the above-described configuration, a configuration in which a rod-shaped member is inserted into the above-described communication hole can be employed.

かかる構成によれば、連通孔に挿通配置されたロッド状部材がシアキーとして作用するため、フーチングへの中空鋼管の定着強度はさらに向上する。   According to such a configuration, since the rod-shaped member inserted and arranged in the communication hole acts as a shear key, the fixing strength of the hollow steel pipe to the footing is further improved.

ロッド状部材は、管壁に対してほぼ垂直となるように連通孔に挿通配置するのが望ましい。   It is desirable that the rod-shaped member is inserted and arranged in the communication hole so as to be substantially perpendicular to the tube wall.

本発明に係る鋼管とフーチングの接合構造は、さまざまな構造物の基礎構造に適用することが可能であって、例えば鋼管・コンクリート複合構造橋脚の基礎構造に適用することができるが、かかる構成によれば、フーチングにおける鉄筋コンクリート工事の作業性が大幅に改善されるため、橋脚本体の工事を早期に開始することが可能となる。   The joint structure of the steel pipe and the footing according to the present invention can be applied to the foundation structure of various structures, for example, can be applied to the foundation structure of a steel pipe / concrete composite structure pier. According to this, the workability of the reinforced concrete work in the footing is greatly improved, so that the work of the pier body can be started at an early stage.

本実施形態に係る鋼管・コンクリート複合構造橋脚を示した全体図であり、(a)は橋軸方向から見た鉛直断面図、(b)は橋軸直交方向(Ａ−Ａ線方向)から見た矢視図。BRIEF DESCRIPTION OF THE DRAWINGS It is a general view which showed the steel pipe and concrete composite structure pier concerning this embodiment, (a) is a vertical sectional view seen from the bridge axis direction, (b) is seen from the bridge axis orthogonal direction (AA line direction). Arrow view. 本実施形態に係る鋼管とフーチングの接合構造を示した全体図であり、(a)は側面図、(b)は鉛直断面図。It is the whole figure which showed the joining structure of the steel pipe and footing which concern on this embodiment, (a) is a side view, (b) is a vertical sectional view. 本実施形態に係る鋼管とフーチングの接合構造の作用を示した説明図。Explanatory drawing which showed the effect | action of the joining structure of the steel pipe and footing which concerns on this embodiment. 変形例に係る鋼管とフーチングの接合構造を示した全体図であり、(a)は側面図、(b)は鉛直断面図、(c)はＢ−Ｂ線に沿う水平断面図。It is the whole figure which showed the joining structure of the steel pipe and footing which concern on a modification, (a) is a side view, (b) is a vertical sectional view, (c) is a horizontal sectional view which follows a BB line. 変形例に係る鋼管とフーチングの接合構造の作用を示した説明図。Explanatory drawing which showed the effect | action of the joining structure of the steel pipe and footing which concerns on a modification.

以下、本発明に係る鋼管とフーチングの接合構造及びそれを用いた鋼管・コンクリート複合構造橋脚の実施の形態について、添付図面を参照して説明する。   DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a steel pipe / footing joint structure and a steel pipe / concrete composite structure pier using the same will be described below with reference to the accompanying drawings.

図１は、本実施形態に係る鋼管・コンクリート複合構造橋脚を示した全体図であり、(a)は橋軸方向から見た鉛直断面図、(b)は橋軸直交方向（Ａ−Ａ線方向）から見た矢視図である。   FIG. 1 is an overall view showing a steel pipe / concrete composite structure pier according to the present embodiment, where (a) is a vertical sectional view as seen from the bridge axis direction, and (b) is a direction perpendicular to the bridge axis (AA line). It is an arrow view seen from (direction).

これらの図でわかるように、本実施形態に係る鋼管・コンクリート複合構造橋脚１は、地盤２内に造成された鉄筋コンクリートからなるフーチング３、該フーチングに立設された橋脚本体４及び該橋脚本体の上端に架け渡された上部工である橋桁５で構成してある。   As can be seen from these drawings, the steel pipe / concrete composite structure pier 1 according to the present embodiment includes a footing 3 made of reinforced concrete formed in the ground 2, a pier body 4 standing on the footing, and the pier body. It consists of a bridge girder 5 that is a superstructure spanning the upper end.

橋脚本体４は、フーチング３から立ち上げられ地表面からＨ1の高さ区間に延設された本体下部４ａと、その上方のＨ2の高さ区間に延設された本体中間部４ｂと、その上方のＨ3の高さ区間に延設された本体上部４ｃとで構成してあり、本体下部４ａは、フーチング３に立設された複数の中空鋼管６と、それらの周囲に配置された鉄筋コンクリートからなるコンクリート体７ａとで構成してあるとともに、中空鋼管６は、橋軸方向に沿って２列、橋軸直交方向に沿って４列となるように鋼管群として配置してある。 The pier body 4 is raised from the footing 3 and extended from the ground surface to a height section of H 1 , a main body intermediate section 4 b extending to a height section of H 2 above it, The upper part 4c of the main body extends in the upper H 3 height section, and the lower part 4a of the main body is arranged around the hollow steel pipes 6 erected on the footing 3 and around them. The hollow steel pipes 6 are arranged as a steel pipe group so that there are two rows along the bridge axis direction and four rows along the bridge axis orthogonal direction.

また、本体中間部４ｂは、本体下部４ａから延びる複数の中空鋼管６及びそれらの周囲に配置されたコンクリート体７ｂで、本体上部４ｃは、本体中間部４ｂから延びる複数の中空鋼管６及びそれらの周囲に配置されたコンクリート体７ｃでそれぞれ構成してある。   Moreover, the main body middle part 4b is a plurality of hollow steel pipes 6 extending from the lower body part 4a and a concrete body 7b arranged around them, and the upper body part 4c is a plurality of hollow steel pipes 6 extending from the main body middle part 4b and their Each is constituted by a concrete body 7c arranged around.

コンクリート体７ｂ，７ｃは、橋脚本体４ｂ，４ｃの表面側近傍に沿って建て込まれた縦筋の外側に複数の中空鋼管６からなる鋼管群を取り囲むように、ＰＣストランド等で構成された引張材を巻回した上、それらが埋設されるように中空鋼管６の周囲にコンクリートを打設することで適宜構成すればよい。   The concrete bodies 7b and 7c are tensions composed of PC strands or the like so as to surround a steel pipe group composed of a plurality of hollow steel pipes 6 outside the vertical bars built in the vicinity of the surface side of the pier main bodies 4b and 4c. What is necessary is just to comprise suitably by laying concrete around the hollow steel pipe 6 so that they may be embedded after winding a material.

図２は、中空鋼管６とフーチング３との接合部を本実施形態に係る鋼管とフーチングの接合構造２１として示したものである。同図に示すように、中空鋼管６は、その下端がフーチング３に埋設されるように該フーチングに接合してあるとともに、該中空鋼管の管壁２２のうち、フーチング３に埋設される範囲に中空鋼管６の内外を連通させる連通孔２３を設け、該連通孔に満たされたコンクリートを介して、中空鋼管６内のコンクリート２４と該中空鋼管の周囲に拡がるコンクリート２５を一体化させてある。   FIG. 2 shows a joining portion 21 between the hollow steel pipe 6 and the footing 3 as a joining structure 21 of the steel pipe and the footing according to this embodiment. As shown in the figure, the hollow steel pipe 6 is joined to the footing so that the lower end thereof is buried in the footing 3, and within the tube wall 22 of the hollow steel pipe within the range buried in the footing 3. A communication hole 23 for communicating the inside and the outside of the hollow steel pipe 6 is provided, and the concrete 24 extending around the hollow steel pipe is integrated with the concrete 24 in the hollow steel pipe 6 through the concrete filled in the communication hole.

連通孔２３は、該連通孔に満たされ固化したコンクリートとそれに一体化された中空鋼管６の内外のコンクリートとの間でせん断力が伝達されるように、その大きさやピッチを適宜設定する。   The size and pitch of the communication holes 23 are appropriately set so that a shearing force is transmitted between the concrete filled and solidified in the communication holes and the concrete inside and outside the hollow steel pipe 6 integrated therewith.

本実施形態に係る鋼管とフーチングの接合構造２１を構築するには、まず、一般的なフーチングの造成手順に従って地盤２を掘り下げるとともに掘り下げられた底面を適宜底付けし、しかる後、図２に示す下端筋２６を配筋するとともに、中空鋼管６を仮受けするための架台（図示せず）をその載置面が該中空鋼管の下端位置となるように設置する。   In order to construct the steel pipe and footing joint structure 21 according to the present embodiment, first, the ground 2 is dug in accordance with a general footing construction procedure, the dug down bottom is appropriately bottomed, and then shown in FIG. While arranging the lower end bars 26, a pedestal (not shown) for provisionally receiving the hollow steel pipe 6 is installed so that its mounting surface is at the lower end position of the hollow steel pipe.

次に、中空鋼管６を架台上に据え付け、次いで上端筋２７を配筋する。なお、本実施形態では、中空鋼管６を取り囲む補強筋の配筋作業は不要である。   Next, the hollow steel pipe 6 is installed on the gantry, and then the upper end bars 27 are arranged. In addition, in this embodiment, the reinforcing bar surrounding work which surrounds the hollow steel pipe 6 is unnecessary.

次に、型枠（図示せず）を適宜建て込んだ後、該型枠の内側にコンクリートを打設してフーチング３の造成を完了する。   Next, after forming a formwork (not shown) as appropriate, concrete is placed inside the formwork to complete the formation of the footing 3.

コンクリートを打設する際には、中空鋼管６の外側に投入されたコンクリートを中空鋼管６の管壁２２に形成された連通孔２３を介して該中空鋼管の内部に流入させ、又はその逆方向に流出させるようにしてもよいが、コンクリートの品質を確保するためには、中空鋼管６の外側と内側にそれぞれコンクリートを投入し、それらを個別に締め固めつつ、連通孔２３にもコンクリートが連続して満たされるようにするのが望ましい。   When placing concrete, the concrete thrown into the outside of the hollow steel pipe 6 is caused to flow into the hollow steel pipe through the communication hole 23 formed in the pipe wall 22 of the hollow steel pipe 6 or in the opposite direction. However, in order to ensure the quality of the concrete, concrete is put into the outer and inner sides of the hollow steel pipe 6 and the concrete is continuously put into the communication hole 23 while being individually compacted. It is desirable to be satisfied.

本実施形態に係る鋼管とフーチングの接合構造２１においては、中空鋼管６に引抜き又は曲げによる引張力が作用したとき、中空鋼管６には、図３に示すようにその外周面（同図右側の面）のみならず、内周面（同図左側の面）にもコンクリートからの付着応力や周面摩擦力が作用するとともに、中空鋼管６内のコンクリート２４と該中空鋼管の周囲に拡がるコンクリート２５が、連通孔２３に満たされたコンクリート３１を介して一体化されているため、コンクリート２４，２５からのせん断力がコンクリート３１に作用し（太い矢印で図示）、さらに連通孔２３へと伝達する。   In the steel pipe and footing joint structure 21 according to this embodiment, when a pulling or bending tensile force is applied to the hollow steel pipe 6, the hollow steel pipe 6 has an outer peripheral surface (on the right side of the figure) as shown in FIG. Not only the surface), but also the inner peripheral surface (the surface on the left side of the figure) is subjected to adhesion stress and peripheral frictional force from the concrete, and the concrete 24 in the hollow steel pipe 6 and the concrete 25 spreading around the hollow steel pipe. However, since it is integrated through the concrete 31 filled in the communication hole 23, the shearing force from the concrete 24, 25 acts on the concrete 31 (illustrated by a thick arrow) and is further transmitted to the communication hole 23. .

以上説明したように、本実施形態に係る鋼管とフーチングの接合構造２１によれば、中空鋼管６の管壁２２のうち、フーチング３に埋設される範囲に中空鋼管６の内外を連通させる連通孔２３を設け、該連通孔に満たされたコンクリート３１を介して、中空鋼管６内のコンクリート２４と該中空鋼管の周囲に拡がるコンクリート２５とを一体化させるようにしたので、中空鋼管６に引張力が作用したとき、該中空鋼管の内周面及び外周面には、コンクリート２４，２５からの付着応力や周面摩擦力が反力として作用するとともに、連通孔２３には、コンクリート３１を介してコンクリート２４，２５からのせん断力が反力として作用する。   As described above, according to the steel pipe and footing joint structure 21 according to the present embodiment, the communication hole that allows the inside and outside of the hollow steel pipe 6 to communicate with each other in the area embedded in the footing 3 in the pipe wall 22 of the hollow steel pipe 6. 23, and the concrete 24 in the hollow steel pipe 6 and the concrete 25 extending around the hollow steel pipe 6 are integrated with each other through the concrete 31 filled in the communication hole. Acts on the inner peripheral surface and outer peripheral surface of the hollow steel pipe as a reaction force from the adhesion stress and peripheral surface friction force from the concrete 24, 25, and the communication hole 23 through the concrete 31 The shearing force from the concrete 24, 25 acts as a reaction force.

そのため、従来のように、リブ付き鋼管を用いたりその周囲に補強筋を配置したりせずとも、中空鋼管６を高い強度でフーチング３に定着することが可能となる。   Therefore, it is possible to fix the hollow steel pipe 6 to the footing 3 with high strength without using a ribbed steel pipe or arranging reinforcing bars around it as in the prior art.

加えて、中空鋼管６の内部空間のうち、フーチング３に埋設される範囲には、中空鋼管６の管壁２２に応力集中が生じて局部座屈を生じることがないよう、コンクリートを充填して剛性を高める必要があるが、上述のように構成すれば、コンクリート打設の際、連通孔２３を介してコンクリートを流出入させることができるため、中空鋼管６内へのコンクリートの充填性や作業性を高めることも可能となる。   In addition, in the internal space of the hollow steel pipe 6, the area embedded in the footing 3 is filled with concrete so that stress concentration does not occur on the pipe wall 22 of the hollow steel pipe 6 and local buckling occurs. Although it is necessary to increase the rigidity, since the concrete can be made to flow in and out through the communication hole 23 when the concrete is placed, the concrete can be filled into the hollow steel pipe 6 and the work can be performed. It is also possible to increase the nature.

また、本実施形態に係る鋼管・コンクリート複合構造橋脚１によれば、上述した鋼管とフーチングの接合構造２１の作用により、フーチング３における鉄筋コンクリート工事の作業性が大幅に改善されることとなり、かくして橋脚本体４の工事を早期に開始することが可能となる。   Further, according to the steel pipe / concrete composite structure pier 1 according to the present embodiment, the workability of the reinforced concrete work in the footing 3 is greatly improved by the action of the joint structure 21 of the steel pipe and the footing described above. The construction of the main body 4 can be started at an early stage.

本実施形態では特に言及しなかったが、フーチング３への中空鋼管６の定着強度が上述の構成では十分でない場合、図４に示した変形例を採用することができる。   Although not particularly mentioned in the present embodiment, when the fixing strength of the hollow steel pipe 6 to the footing 3 is not sufficient with the above-described configuration, the modification shown in FIG. 4 can be adopted.

同図に示した変形例に係る鋼管とフーチングの接合構造４１は、上述した実施形態と同様、中空鋼管６をその下端がフーチング３に埋設されるように該フーチングに接合するとともに、中空鋼管６の管壁２２のうち、フーチング３に埋設される範囲に中空鋼管６の内外を連通させる連通孔２３を設け、該連通孔に満たされたコンクリートを介して中空鋼管６内のコンクリート２４と該中空鋼管の周囲に拡がるコンクリート２５とを一体化させてあるが、本変形例では、ロッド状部材としての短鉄筋４２を、管壁２２に対してほぼ垂直となるように連通孔２３に挿通配置してある。   The steel pipe and footing joint structure 41 according to the modification shown in the figure is similar to the above-described embodiment in that the hollow steel pipe 6 is joined to the footing so that the lower end thereof is embedded in the footing 3, and the hollow steel pipe 6 In the tube wall 22, a communication hole 23 for communicating the inside and outside of the hollow steel pipe 6 is provided in a range embedded in the footing 3, and the concrete 24 in the hollow steel pipe 6 and the hollow are connected via the concrete filled in the communication hole. The concrete 25 extending around the steel pipe is integrated, but in this modification, the short rebar 42 as a rod-shaped member is inserted into the communication hole 23 so as to be substantially perpendicular to the pipe wall 22. It is.

かかる構成において中空鋼管６に引張力が作用したときも上述の実施形態と同様、図５に示すように、中空鋼管６の内周面及び外周面にコンクリート２４，２５からの付着応力や周面摩擦力が反力として作用するとともに（細い矢印で図示）、連通孔２３には、コンクリート３１を介してコンクリート２４，２５からのせん断力が反力として作用するが（太い矢印で図示）、これらに加え、連通孔２３に挿通配置された短鉄筋４２がシアキーとして作用するため（白抜きの矢印で図示）、フーチング３への中空鋼管６の定着強度はさらに向上する。   In this configuration, when a tensile force is applied to the hollow steel pipe 6, as shown in FIG. 5, as shown in FIG. A frictional force acts as a reaction force (illustrated by thin arrows), and a shear force from the concrete 24, 25 acts as a reaction force through the concrete 31 in the communication hole 23 (illustrated by thick arrows). In addition, since the short reinforcing bar 42 inserted and arranged in the communication hole 23 acts as a shear key (illustrated by a white arrow), the fixing strength of the hollow steel pipe 6 to the footing 3 is further improved.

１ 鋼管・コンクリート複合構造橋脚
３ フーチング
４ 橋脚本体
６ 中空鋼管（鋼管群）
７ａ，７ｂ コンクリート体
２１，４１ 鋼管とフーチングの接合構造
２２ 管壁
２３ 連通孔
３１，２４，２５ コンクリート
４２ 短鉄筋（ロッド状部材） 1 Steel pipe / concrete composite pier 3 Footing 4 Pier body 6 Hollow steel pipe (steel pipe group)
7a, 7b Concrete bodies 21, 41 Joint structure of steel pipe and footing 22 Pipe wall 23 Communication holes 31, 24, 25 Concrete 42 Short rebar (rod-like member)

Claims (3)

中空鋼管をその下端がフーチングに埋設されるように該フーチングに接合してなる鋼管とフーチングの接合構造において、
前記中空鋼管の管壁のうち、前記フーチングに埋設される範囲に該中空鋼管の内外を連通させる連通孔を設けるとともに、該連通孔に満たされたコンクリートを介して前記中空鋼管内のコンクリートと該中空鋼管の周囲に拡がるコンクリートとを一体化させたことを特徴とする鋼管とフーチングの接合構造。 In the joining structure of the steel pipe and the footing formed by joining the hollow steel pipe to the footing so that the lower end thereof is embedded in the footing,
A communication hole for communicating the inside and the outside of the hollow steel pipe is provided in a range of the pipe wall of the hollow steel pipe that is embedded in the footing, and the concrete in the hollow steel pipe is connected to the concrete through the concrete filled in the communication hole. A joining structure of a steel pipe and a footing, characterized by integrating a concrete extending around a hollow steel pipe. 前記連通孔にロッド状部材を挿通配置した請求項１記載の鋼管とフーチングの接合構造。 The steel pipe and footing joint structure according to claim 1, wherein a rod-like member is inserted and disposed in the communication hole. フーチングと該フーチングに立設された橋脚本体とを備えるとともに、該橋脚本体を、鋼管群として複数立設された中空鋼管とそれらの周囲に配置されたコンクリート体とで構成した鋼管・コンクリート複合構造橋脚において、
前記中空鋼管と前記フーチングとの接合部を請求項１又は請求項２記載の鋼管とフーチングの接合構造を用いて構成したことを特徴とする鋼管・コンクリート複合構造橋脚。 A steel pipe / concrete composite structure comprising a footing and a pier body standing on the footing, the pier body comprising a plurality of hollow steel pipes standing as a steel pipe group and a concrete body arranged around them. On the pier,
3. A steel pipe / concrete composite structure pier, wherein the joint between the hollow steel pipe and the footing is constructed using the steel pipe / footing joint structure according to claim 1 or 2.
JP2013082257A 2013-04-10 2013-04-10 Steel pipe / concrete composite structure pier Active JP6180775B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109488099A (en) * 2018-12-27 2019-03-19 中国移动通信集团甘肃有限公司 It is a kind of for communicating the fender pier of overhead transmission line engineering construction

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06322720A (en) * 1993-05-12 1994-11-22 Ohbayashi Corp Steel pipe/concrete composite construction bridge pier
JPH07247556A (en) * 1994-03-03 1995-09-26 Nippon Steel Corp Structure for fixing base of column in steel column member
JP2006104747A (en) * 2004-10-05 2006-04-20 Public Works Research Institute Pier stud connection structure and pier stud connecting method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06322720A (en) * 1993-05-12 1994-11-22 Ohbayashi Corp Steel pipe/concrete composite construction bridge pier
JPH07247556A (en) * 1994-03-03 1995-09-26 Nippon Steel Corp Structure for fixing base of column in steel column member
JP2006104747A (en) * 2004-10-05 2006-04-20 Public Works Research Institute Pier stud connection structure and pier stud connecting method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109488099A (en) * 2018-12-27 2019-03-19 中国移动通信集团甘肃有限公司 It is a kind of for communicating the fender pier of overhead transmission line engineering construction

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