JP5043351B2 - Joint structure of steel column and ready-made pile - Google Patents

Joint structure of steel column and ready-made pile Download PDF

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JP5043351B2
JP5043351B2 JP2006078925A JP2006078925A JP5043351B2 JP 5043351 B2 JP5043351 B2 JP 5043351B2 JP 2006078925 A JP2006078925 A JP 2006078925A JP 2006078925 A JP2006078925 A JP 2006078925A JP 5043351 B2 JP5043351 B2 JP 5043351B2
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ready
made pile
steel column
pile
main body
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JP2007255003A (en
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修 今野
俊英 山下
忠 成瀬
泰輔 藤嶋
近仁 峯
治人 五十嵐
仁 伊藤
勇治 芳賀
雅 青木
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Toray Engineering Co Ltd
Maeda Corp
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Toyo Construction Co Ltd
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Description

本発明は、鉄骨柱と既製杭との接合構造に関する。   The present invention relates to a joint structure between a steel column and a ready-made pile.

従来より、建物の杭と柱は基礎（フーチングや基礎梁等）を介して接合されるものであるが、近年においては杭の大口径化や支持力性能の向上、また工期短縮とコスト削減等を主目的として、基礎を省略して杭と柱とを直接的に接合する工法が試みられている（例えば、特許文献１参照）。   Traditionally, building piles and columns are joined via foundations (footing, foundation beams, etc.), but in recent years the diameter of piles has been increased, bearing capacity has been improved, construction period has been shortened and costs have been reduced, etc. As a main purpose, a construction method has been attempted in which the foundation is omitted and the pile and the column are directly joined (for example, see Patent Document 1).

この特許文献１に記載の技術は、既製杭の中空の杭頭部に柱の柱脚部を挿入するとともに、中空の杭頭部にコンクリート等の充填材を充填することで、既製杭と柱とを剛接合する技術となっている。
特開２００４−２３８９２７号公報 The technique described in Patent Document 1 inserts a column base of a column into a hollow pile head of a ready-made pile, and fills the hollow pile head with a filler such as concrete, so that the ready-made pile and the column It is a technology for rigid joining.
JP 2004-238927 A

ところが、上記特許文献１のような技術の場合、既製杭の打設時に地盤状況や施工方法によって施工誤差が生じてしまうことがある。
このように施工誤差が生じてしまうと、柱を既製杭の杭頭部に挿入する際に、例えば柱が杭頭部の縁に引っ掛かったり、所定の深さまで柱を挿入できなかったり等、前記既製杭の杭頭部内に柱を挿入しにくい場合があった。
そして、柱（以下、鉄骨柱）を前記既製杭の杭頭部内に挿入できなかった際には、既製杭の打設のやり直し等、手間がかかる場合があったため、既製杭の施工誤差を確実に吸収して施工性の向上を図ることが可能な技術の開発が望まれていた。 However, in the case of the technique such as Patent Document 1, a construction error may occur depending on the ground condition or the construction method when a ready-made pile is placed.
When construction errors occur in this way, when inserting the column into the pile head of the ready-made pile, for example, the column is caught on the edge of the pile head, the column cannot be inserted to a predetermined depth, etc. In some cases, it was difficult to insert a column into the pile head of a ready-made pile.
And when a column (hereinafter referred to as a steel column) could not be inserted into the pile head of the ready-made pile, it could take time, such as redoing the ready-made pile, so the construction error of the ready-made pile was reduced. There has been a demand for the development of a technique that can reliably absorb and improve workability.

本発明は、既製杭の施工誤差を確実に吸収することができ、これによって、施工性の向上を図ることが可能な鉄骨柱と既製杭との接合構造を提供することを目的とする。   An object of this invention is to provide the joining structure of the steel column and ready-made pile which can absorb the construction error of a ready-made pile reliably, and can aim at the improvement of workability by this.

請求項１に記載の発明は、例えば、図１（ａ）、（ｂ）および図２（ａ）、（ｂ）に示すように、鉄骨柱１０Ｃ（１０）と既製杭２０Ｃ（２０）との接合構造において、前記既製杭２０Ｃ（２０）は、既製杭本体３０Ｃ（３０）とこの既製杭本体３０Ｃ（３０）の上端部に設けられ、前記既製杭本体３０Ｃ（３０）より直径が大きい拡頭部４０Ｃ（４０）とから構成され、前記既製杭本体３０Ｃ（３０）の上端部に、前記鉄骨柱１０Ｃ（１０）が設けられるとともに、前記拡頭部４０Ｃ（４０）に前記鉄骨柱１０Ｃ（１０）が接合されており、前記拡頭部４０Ｃ（４０）は、前記鉄骨柱１０Ｃ（１０）の周囲を鉄筋コンクリート４１Ｃ（４３Ｃ）で包み込むことによって構成されていることを特徴とする。 For example, as shown in FIGS. 1 (a), (b) and FIGS. 2 (a), (b), the invention described in claim 1 includes a steel column 10C ( 10 ) and a ready-made pile 20C ( 20 ) . in the junction structure, the prefabricated pile 20C (20) is provided at the upper end of the prefabricated pile body 30C (30) and the ready-made pile body 30C (30), the prefabricated pile body 30C (30) than the larger diameter拡頭unit is composed from the 40C (40), the upper end of the prefabricated pile body 30C (30), together with the steel columns 10C (10) is provided, said steel columns 10C to the拡頭section 40C (40) (10) is The expanded head 40C (40) is formed by wrapping the periphery of the steel column 10C (10) with reinforced concrete 41C (43C) .

請求項１に記載の発明によれば、前記既製杭が、既製杭本体とこの既製杭本体の上端部に設けられ、前記既製杭本体より直径が大きい拡頭部とから構成されているので、この拡頭部に前記鉄骨柱を接合するに際して、前記拡頭部が従来の杭頭部に対して大径になった分、鉄骨柱の平面的な接合位置の自由度が高まる。これによって、既製杭の打設時に生じる施工誤差を容易、かつ確実に吸収することができ、施工性の向上を図ることが可能となる。
また、前記拡頭部が前記鉄骨柱の周囲を鉄筋コンクリートで包み込むことによって構成されているので、前記鉄骨柱と既製杭とを強固に接合することができるとともに、前記拡頭部が従来の杭頭部に対して大径になった分、鉄骨柱の平面的な接合位置の自由度が高まる。これにより、既製杭の打設時に生じる施工誤差を容易、かつ確実に吸収することができ、施工性の向上を図ることが可能となる。 According to invention of Claim 1, since the said ready-made pile is comprised in the upper end part of this ready-made pile main body and this ready-made pile main body, and it is comprised from the enlarged head larger in diameter than the said ready-made pile main body, this When joining the steel column to the enlarged head, the degree of freedom of the planar joining position of the steel column increases as the enlarged head becomes larger in diameter than the conventional pile head. This makes it possible to easily and reliably absorb construction errors that occur when placing ready-made piles, and to improve workability.
Moreover, since the said head extension is comprised by wrapping the circumference | surroundings of the said steel column with a reinforced concrete, while being able to join the said steel column and a ready-made pile firmly, the said head extension is a conventional pile head. On the other hand, the degree of freedom of the planar joining position of the steel column increases as the diameter increases. As a result, it is possible to easily and reliably absorb construction errors that occur when placing ready-made piles, and it is possible to improve workability.

本発明によれば、前記既製杭が、既製杭本体とこの既製杭本体の上端部に設けられ、前記既製杭本体より直径が大きい拡頭部とから構成されているので、この拡頭部に前記鉄骨柱を接合するに際して、前記拡頭部が従来の杭頭部に対して大径になった分、鉄骨柱の平面的な接合位置の自由度が高まる。これによって、既製杭の打設時に生じる施工誤差を容易、かつ確実に吸収することができ、施工性の向上を図ることが可能となる。
また、前記鉄骨柱と既製杭との接合に際し、前記鉄骨柱はコンクリートによって既製杭の拡頭部に設けられることとなるので、前記鉄骨柱と既製杭とを強固に接合することが可能となる。 According to this invention, since the said ready-made pile is provided in the upper end part of an ready-made pile main body and this ready-made pile main body, and is comprised from the said enlarged pile head with a larger diameter than the said ready-made pile main body, the steel frame is added to this enlarged head. When joining the columns, the degree of freedom of the planar joining position of the steel column is increased by the amount that the enlarged head has a larger diameter than the conventional pile head. This makes it possible to easily and reliably absorb construction errors that occur when placing ready-made piles, and to improve workability.
Further, when the steel column and the ready-made pile are joined, the steel column is provided on the enlarged head of the ready-made pile by concrete, so that the steel column and the ready-made pile can be firmly joined.

以下、図面を参照して本発明に係る鉄骨柱１０と既製杭２０との接合構造の実施の形態について説明する。
ここで、以下に説明する実施の形態の鉄骨柱１０（１０Ｃ）と既製杭２０（２０Ｃ）の接合構造は、図１〜図３に示すように、前記既製杭２０（２０Ｃ）が、既製杭本体３０（３０Ｃ）とこの既製杭本体３０（３０Ｃ）の上端部に設けられ、前記既製杭本体３０（３０Ｃ）より直径が大きい拡頭部４０（４０Ｃ）とから構成され、この拡頭部４０（４０Ｃ）に前記鉄骨柱１０（１０Ｃ）が接合されていることを基本構造Ｓとしている。 Hereinafter, an embodiment of a joint structure between a steel column 10 and a ready-made pile 20 according to the present invention will be described with reference to the drawings.
Here, joint structure that describes the following implementation form steel columns 10 of (1 0C) and ready-made pile 20 (2 0C), as shown in FIGS. 1 to 3, wherein the ready-made pile 20 (2 0C ) is provided at the upper end of the prefabricated pile body 30 (3 0C) and the ready-made pile body 30 (3 0C), the from prefabricated pile body 30 (3 0C) than larger diameter拡頭section 40 (4 0C) The basic structure S is that the steel column 10 (10 C) is joined to the expanded head 40 ( 40 C).

本実施の形態の鉄骨柱１０Ｃと既製杭２０Ｃ（２０Ｃａ、２０Ｃｂ）との接合構造は、前記基本構造Ｓを備えているとともに、図１（ａ）、（ｂ）および図２（ａ）、（ｂ）に示すように、前記既製杭本体３０Ｃ（３０Ｃａ、３０Ｃｂ）の上端部に、前記鉄骨柱１０Ｃが設けられており、前記拡頭部４０Ｃは、前記鉄骨柱１０Ｃの周囲を鉄筋コンクリート４１Ｃ（４３Ｃ）で包み込むことによって構成されているものである。 The joint structure of the steel column 10C and the ready-made pile 20C (20Ca, 20Cb) of the present embodiment includes the basic structure S, and FIGS. 1 (a), 1 (b) and 2 (a), ( As shown to b), the said steel column 10C is provided in the upper end part of the said ready-made pile main body 30C (30Ca, 30Cb), and the said expanded head 40C is reinforced concrete 41C (43C) around the said steel column 10C. It is configured by wrapping with.

ここで、本実施の形態の鉄骨柱１０Ｃとして中空状に形成された鋼管柱が採用され、その下端部にはベースプレート１１Ｃが設けられている。   Here, a steel pipe column formed in a hollow shape is adopted as the steel column 10C of the present embodiment, and a base plate 11C is provided at the lower end thereof.

一方、既製杭２０Ｃは、図１（ａ）、（ｂ）に示すように、中空円筒状に形成された既製杭本体３０Ｃａとこの既製杭本体３０Ｃａの上端部に設けられた拡頭部本体４０Ｃａとからなるもの（既製杭２０Ｃａ）と、図２（ａ）、（ｂ）に示すように、中空円筒状に形成された既製杭本体３０Ｃｂからなるもの（既製杭２０Ｃｂ）と、が用いられている。 On the other hand, prefabricated pile 20C is FIG. 1 (a), and (b), the provided ready-made pile body 30Ca formed in a hollow cylindrical shape with the upper end of the prefabricated pile body 30Ca拡頭body 40Ca As shown in FIGS. 2 (a) and 2 (b), the one made of a pre-made pile main body 30Cb formed in a hollow cylindrical shape (the pre-made pile 20Cb) is used. .

また、前記拡頭部４０Ｃは、上述したように、既製杭本体３０Ｃ（３０Ｃａ、３０Ｃｂ）の上端部に設けられた前記鉄骨柱１０Ｃの周囲を鉄筋コンクリート４１Ｃ（４３Ｃ）で包み込むことによって構成されている。   Further, as described above, the expanded head portion 40C is configured by wrapping the periphery of the steel column 10C provided at the upper end portion of the ready-made pile main body 30C (30Ca, 30Cb) with reinforced concrete 41C (43C).

すなわち、図１に示すように、前記既製杭本体３０Ｃａおよび拡頭部本体４０Ｃａを備えた既製杭２０Ｃａの場合は、拡頭部本体４０Ｃａの上端部に前記鉄骨柱１０Ｃを設け、この鉄骨柱１０Ｃの周囲を鉄筋コンクリート４１Ｃで包み込むようにしている。この際、鉄骨柱１０Ｃの周囲を包み込む鉄筋コンクリート４１Ｃは、前記拡頭部本体４０Ｃａと等しい外径になるようにコンクリート４１Ｃｂを打設するようにしている。
つまり、例えば図３（ａ）に示すように、縦横に組み付けられた鉄筋４１Ｃａを、拡頭部本体４０Ｃａの上端部に設けられた端部金具４２上に溶接してから、周囲にコンクリート４１Ｃｂを打設するようにしており、以上のようにして前記拡頭部４０Ｃが構成されている。 That is, as shown in FIG. 1 , in the case of the ready-made pile 20Ca provided with the ready-made pile main body 30Ca and the expanded head main body 40Ca, the steel column 10C is provided at the upper end of the expanded head main body 40Ca, and the periphery of the steel column 10C is provided. Is wrapped in reinforced concrete 41C. At this time, the reinforced concrete 41C wrapping around the steel column 10C is placed with the concrete 41Cb so as to have an outer diameter equal to that of the enlarged head main body 40Ca.
Striking words, for example, as shown in FIG. 3 (a), the reinforcing bars 41Ca assembled vertically and horizontally, from the welding on the end fitting 42 provided at the upper portion of the拡頭body 40Ca, concrete 41Cb around The expanded head 40C is configured as described above.

なお、コンクリート４１Ｃｂを打設する際は、図示はしないが、前記鉄骨柱１０Ｃの周囲に型枠を形成してからコンクリート打設作業を行う。   In addition, when placing concrete 41Cb, although not shown, a concrete placing operation is performed after forming a mold around the steel column 10C.

一方、図２に示すように既製杭本体３０Ｃｂからなる既製杭２０Ｃｂの場合は、既製杭本体３０Ｃｂの上端部に前記鉄骨柱１０Ｃを設け、この鉄骨柱１０Ｃの周囲を鉄筋コンクリート４３Ｃで包み込むようにしている。
つまり、例えば図２（ｂ）示すように、縦横に組みつけられた鉄筋４３Ｃａの下端部を、既製杭本体３０Ｃｂの上端部に溶接してから、周囲にコンクリート４３Ｃｂを打設するようにしており、このようにして前記拡頭部４０Ｃが構成されている。
この時、前記既製杭本体３０Ｃｂの上端部には、図３（ｂ）に示すように、既製杭本体３０Ｃｂの上端面に設けられた端部金具４２ａと、既製杭本体３０Ｃｂの上端部側面に設けられた側板４６ａおよび補強バンド４４ａとを備えている。
また、その他にも、図４に示すように、前記既製杭本体３０Ｃｂの上端部に、上端面に設けられる端部金具４２ｂと、上端部側面に設けられる鋼管バンド４７を設けるようにしても良い。 On the other hand, in the case of the ready-made pile 20Cb made of the ready-made pile main body 30Cb as shown in FIG. 2 , the steel column 10C is provided at the upper end of the ready-made pile main body 30Cb, and the periphery of the steel column 10C is wrapped with the reinforced concrete 43C. Yes.
That is, for example, as shown in FIG. 2 (b), the lower end portion of the reinforcing bar 43Ca assembled vertically and horizontally is welded to the upper end portion of the ready-made pile main body 30Cb, and then concrete 43Cb is placed around the periphery. In this way, the expanded head portion 40C is configured.
At this time, as shown in FIG. 3 (b), the upper end portion of the ready-made pile main body 30Cb is connected to the end fitting 42a provided on the upper end surface of the ready-made pile main body 30Cb, and the upper end side surface of the ready-made pile main body 30Cb. A side plate 46a and a reinforcing band 44a are provided.
In addition, as shown in FIG. 4 , an end fitting 42b provided on the upper end surface and a steel pipe band 47 provided on the side surface of the upper end portion may be provided on the upper end portion of the ready-made pile main body 30Cb. .

なお、前記補強バンド４４は、既製杭２０Ｃｂの補強のため、既製杭本体３０Ｃｂの上端部外面に取り付られるものである。また、この補強バンド４４は杭の補強のために用いるものであるから、前記既製杭本体３０Ｃａの上端部外面に取り付けても良い。
また、なお、コンクリート４３Ｃｂを打設する際は、図示はしないが、前記鉄骨柱１０Ｃの周囲に型枠を形成してからコンクリート打設作業を行う。 In addition, the said reinforcement band 44 is attached to the upper end part outer surface of the ready-made pile main body 30Cb for reinforcement of the ready-made pile 20Cb. Moreover, since this reinforcement band 44 is used for the reinforcement of a pile, you may attach to the upper end part outer surface of the said ready-made pile main body 30Ca.
In addition, when placing the concrete 43Cb, although not shown, the concrete placing work is performed after forming a mold around the steel column 10C.

次に、前記鉄骨柱１０Ｃと既製杭２０Ｃ（２０Ｃａ、２０Ｃｂ）とを接合する際は、まず、前記既製杭２０Ｃ（２０Ｃａ、２０Ｃｂ）を地中に打ち込むとともに、既製杭本体３０Ｃ（３０Ｃａ、３０Ｃｂ）の上端部に鉄筋（４１Ｃａ、４３Ｃａ）を溶接する。また、鉄筋（４１Ｃａ、４３Ｃａ）の周囲に型枠を設置しておく。
その後、前記既製杭本体３０Ｃ（３０Ｃａ、３０Ｃｂ）の上端部に前記鉄骨柱１０Ｃを設けるとともに型枠にコンクリート（４１Ｃｂ、４３Ｃｂ）を打設して、前記鉄骨柱１０Ｃの周囲を鉄筋コンクリート（４１Ｃ、４３Ｃ）で包み込むようにして拡頭部４０Ｃを形成し、鉄骨柱１０Ｃと既製杭２０Ｃ（２０Ｃａ、２０Ｃｂ）とを接合する。 Next, when joining the steel column 10C and the ready-made pile 20C (20Ca, 20Cb), first, the ready-made pile 20C (20Ca, 20Cb) is driven into the ground and the ready-made pile main body 30C (30Ca, 30Cb). Reinforcing bars (41Ca, 43Ca) are welded to the upper end of each. Moreover, the formwork is installed around the reinforcing bars (41Ca, 43Ca).
After that, the steel column 10C is provided at the upper end of the ready-made pile main body 30C (30Ca, 30Cb) and concrete (41Cb, 43Cb) is placed on the mold, and the periphery of the steel column 10C is reinforced concrete (41C, 43C). ) To wrap the steel head 10C and the steel pile 10C and the ready-made pile 20C (20Ca, 20Cb).

本実施の形態によれば、前記拡頭部４０Ｃが前記鉄骨柱１０Ｃの周囲を鉄筋コンクリート（４１Ｃ、４３Ｃ）で包み込むことによって構成されているので、前記鉄骨柱１０Ｃと既製杭２０Ｃ（２０Ｃａ、２０Ｃｂ）とを強固に接合することができるとともに、前記拡頭部４０Ｃが従来の杭頭部に対して大径になった分、鉄骨柱１０Ｃの平面的な接合位置の自由度が高まる。これにより、既製杭２０Ｃ（２０Ｃａ、２０Ｃｂ）の打設時に生じる施工誤差を容易、かつ確実に吸収することができ、施工性の向上を図ることが可能となる。   According to the present embodiment, the expanded head portion 40C is configured by wrapping the periphery of the steel column 10C with reinforced concrete (41C, 43C), so the steel column 10C and the ready-made pile 20C (20Ca, 20Cb) Can be firmly joined, and the degree of freedom of the planar joining position of the steel column 10C is increased by the amount that the expanded head 40C has a larger diameter than the conventional pile head. Thereby, the construction error which arises at the time of placement of ready-made pile 20C (20Ca, 20Cb) can be absorbed easily and certainly, and it becomes possible to aim at improvement of workability.

本発明に係る実施形態の鉄骨柱と既製杭との接合構造を示し、（ａ）は正面図であり、（ｂ）は断面図である。The present invention show a joint structure between the steel column and the ready-made pile engagement Ru implementation form, (a) is a front view, (b) is a cross-sectional view. 本発明に係る実施形態の鉄骨柱と既製杭との接合構造を示し、（ａ）は正面図であり、（ｂ）は断面図である。The present invention show a joint structure between the steel column and the ready-made pile engagement Ru implementation form, (a) is a front view, (b) is a cross-sectional view. 既製杭に鉄筋を固定する際の構造であり、（ａ）は既製杭本体の上端面に鉄筋を固定したことを示す斜視図であり、（ｂ）は既製杭本体の上端部側面に鉄筋を固定したことを示す要部拡大図である。It is a structure at the time of fixing a reinforcing bar to a ready-made pile, (a) is a perspective view which shows fixing a reinforcing bar to the upper end surface of a ready-made pile main body, (b) is a reinforcing bar to the upper end part side of a ready-made pile main body. It is a principal part enlarged view which shows having fixed. 既製杭本体の上端部側面に鉄筋を固定したことを示す要部拡大図である。It is a principal part enlarged view which shows having fixed the reinforcing bar to the upper end part side surface of a ready-made pile main body.

１０ 鉄骨柱
２０ 既製杭
３０ 既製杭本体
４０ 拡頭部 10 Steel pillar 20 Ready-made pile 30 Ready-made pile body 40 Head expansion

Claims (1)

鉄骨柱と既製杭との接合構造において、
前記既製杭は、既製杭本体と、この既製杭本体の上端部に設けられ、前記既製杭本体より直径が大きい拡頭部とから構成され、
前記既製杭本体の上端部に、前記鉄骨柱が設けられるとともに、前記拡頭部に前記鉄骨柱が接合されており、
前記拡頭部は、前記鉄骨柱の周囲を鉄筋コンクリートで包み込むことによって構成されていることを特徴とする鉄骨柱と既製杭との接合構造。 In the joint structure between steel columns and ready-made piles,
The ready-made pile is composed of a ready-made pile main body, and an enlarged head having a diameter larger than that of the ready-made pile main body, provided at the upper end of the ready-made pile main body
The steel column is provided on the upper end of the ready-made pile body, and the steel column is joined to the enlarged head ,
The said head extension is comprised by wrapping the surroundings of the said steel column with a reinforced concrete, The joining structure of the steel column and ready-made pile characterized by the above-mentioned .
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