JP3418677B2 - Joint structure of steel pipe pile and footing - Google Patents
Joint structure of steel pipe pile and footingInfo
- Publication number
- JP3418677B2 JP3418677B2 JP19998898A JP19998898A JP3418677B2 JP 3418677 B2 JP3418677 B2 JP 3418677B2 JP 19998898 A JP19998898 A JP 19998898A JP 19998898 A JP19998898 A JP 19998898A JP 3418677 B2 JP3418677 B2 JP 3418677B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- footing
- pile
- joint
- pipe pile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Foundations (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は鋼管杭とフーチングコ
ンクリートの結合部構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure between a steel pipe pile and footing concrete.
【0002】[0002]
【従来技術とこの発明が解決しようとする課題】従来の
杭とフーチングの結合部においては、一般に杭頭の中空
部に鉄筋篭の下部を挿入し、鉄筋篭の上部をフーチング
に挿入する構造が実施されている。2. Description of the Related Art A conventional pile-footing joint has a structure in which a lower portion of a rebar cage is inserted into a hollow portion of a pile head and an upper portion of the rebar cage is inserted into a footing. It has been implemented.
【0003】ところでこの構造では杭に作用する軸力や
水平力が大きくなると、補強鉄筋の配置が密になり、そ
の加工、施工が困難になる。さらに断面性能を確保する
ため杭頭部に補強鉄筋を溶接して杭頭上方に突設するよ
うに取付ける必要がある。By the way, in this structure, when the axial force and horizontal force acting on the pile become large, the reinforcing reinforcing bars are densely arranged, which makes it difficult to process and construct them. Furthermore, in order to ensure cross-sectional performance, it is necessary to weld reinforcing reinforcing bars to the head of the pile and install it so as to project above the head of the pile.
【0004】その他の構造として、杭頭を杭径程度フー
チング中に埋込む結合部構造では、フーチング下端筋の
配筋が密になり、作業性が悪い。そして杭頭とフーチン
グを剛結しているため、大地震等による外力に対してフ
ーチング、杭頭、杭中間部のどこで破壊するのか不明瞭
である。As another structure, in the joint structure in which the pile head is embedded in the footing to the extent of the pile diameter, the bar arrangement at the bottom end of the footing becomes dense and workability is poor. Since the pile head and footing are rigidly connected, it is unclear where to break the footing, the pile head, or the middle part of the pile against external force caused by a large earthquake.
【0005】さらに杭に作用する軸力が大きい場合、剪
断力に抵抗させるため、フーチング高さを大きくする必
要があり、必然的にフーチングが大型化する。Further, when the axial force acting on the pile is large, it is necessary to increase the footing height in order to resist the shearing force, which inevitably increases the size of the footing.
【0006】この発明は前記従来の問題点を解消するた
め創案、作成されたものである。The present invention was created and created in order to solve the above conventional problems.
【0007】[0007]
【課題を解決するための手段】この発明は鋼管杭頭部の
中空部に結合鋼管下部を挿入しその結合鋼管内および結
合鋼管と鋼管杭の間隙にモルタル類を中詰めすることに
よって固定し、杭頭部から突出した結合鋼管上部を杭頭
部上方のフーチングコンクリート内に定着し杭頭とフー
チングの接合部の変形性能を大きく構成してなり、また
杭の内面と結合鋼管の外面には多数の突起を設けてあ
る。According to the present invention, a joint steel pipe lower portion is inserted into a hollow portion of a steel pipe pile head and fixed by filling mortar inside the joint steel pipe and in the gap between the joint steel pipe and the steel pipe pile. The upper part of the joint steel pipe protruding from the pile head is anchored in the footing concrete above the pile head to make the deformation performance of the joint between the pile head and footing large, and there are many on the inner surface of the pile and the outer surface of the joint steel pipe. The projection is provided.
【0008】[0008]
【実施例】図1に示す実施例は地盤中に打込まれたその
結合鋼管2内および結合鋼管2と鋼管杭1の頭部の中空
部に継手金具となる結合鋼管2の下部を挿入し、その結
合鋼管2内および結合鋼管2と鋼管杭1の間隙コンクリ
ート等のモルタル類3を中詰めすることによって固定し
てある。鋼管杭1の頭部から突出した結合鋼管2を埋設
するように鋼管杭1上部にフーチング4のコンクリート
を鉄筋を配筋して打設してある。EXAMPLE In the embodiment shown in FIG. 1, the lower portion of the joint steel pipe 2 which is a joint fitting is inserted into the joint steel pipe 2 driven into the ground and into the hollow portion of the joint steel pipe 2 and the head of the steel pipe pile 1. The mortars 3 such as interstitial concrete of the joint steel pipe 2 and the joint steel pipe 2 and the steel pipe pile 1 are fixed by being filled. Concrete of the footing 4 is laid on the upper portion of the steel pipe pile 1 so that the joint steel pipe 2 protruding from the head of the steel pipe pile 1 is buried with reinforcing bars.
【0009】鋼管杭1の中空部の内側面および結合鋼管
2の外側面にはモルタル類3およびフーチング4のコン
クリートとの付着力を向上させるため、シアーコネクタ
ーとして多数の突起5、その他ジベル等を突設し、ある
いは縞模様を形成してある。On the inner surface of the hollow portion of the steel pipe pile 1 and the outer surface of the jointed steel pipe 2, in order to improve the adhesion of the mortar 3 and footing 4 to the concrete, a large number of protrusions 5 as a shear connector and other dowels are provided. It is projected or formed with a striped pattern.
【0010】そしてフーチングと鋼管杭の結合部は、地
震時における地盤の水平変位と構造物の水平変位の両者
の影響を吸収する性能が要求される箇所である。この結
合部は図1にみられるように杭1の剛性とフーチング4
の剛性に比較して、径の小さい結合鋼管2のみとなるの
で剛性が小さく、鋼管の中にコンクリートが充填された
鋼管構造となるので、変形性能が大きくなり、大地震等
による外力に対し、前記結合部で破壊が先行する。The joint between the footing and the steel pipe pile is a place where the ability to absorb both the horizontal displacement of the ground and the horizontal displacement of the structure during an earthquake is required. This joint is made up of the rigidity of the pile 1 and the footing 4 as shown in FIG.
Compared with the rigidity of the steel pipe, only the connected steel pipe 2 has a small diameter, so the rigidity is small, and the steel pipe structure has concrete filled in the steel pipe, so the deformation performance is large and the external force due to a large earthquake, etc. Destruction precedes at the joint.
【0011】フーチングに作用する鉛直荷重は直接鋼管
杭1に伝達される荷重と中詰めモルタル類3を介して伝
達される荷重により支持される。The vertical load acting on the footing is supported by the load directly transmitted to the steel pipe pile 1 and the load transmitted through the filling mortars 3.
【0012】図2,3に示す実施例は前記実施例と同様
の隣接する鋼管杭1の頭部から突出した結合鋼管2の上
部を連結鋼材6で接続してある。フーチングに作用する
水平荷重は結合鋼管2のせん断力として作用し、中詰め
モルタル類3を介して鋼管杭1に伝達される。In the embodiment shown in FIGS. 2 and 3, the upper part of the joint steel pipe 2 protruding from the head of the adjacent steel pipe pile 1 similar to the above-mentioned embodiment is connected by the connecting steel material 6. The horizontal load acting on the footing acts as a shearing force of the jointed steel pipe 2 and is transmitted to the steel pipe pile 1 via the filling mortars 3.
【0013】この実施例では連結鋼材6は平行した2枚
の厚鋼板の端部を結合鋼管2の側面に突合せ、溶接して
取付けてある。なおこの結合鋼管2と連結鋼材6を予め
組合せておいて現場で鋼管杭1に建込むようにしてもよ
い。In this embodiment, the connecting steel member 6 is attached by welding the ends of two parallel thick steel plates to the side surface of the joint steel pipe 2 and welding. The combined steel pipe 2 and the connecting steel material 6 may be combined in advance and installed in the steel pipe pile 1 on site.
【0014】また連結鋼材6には形鋼を使用し、結合鋼
管2の側面のみならず、図4に示すように頂部に載置
し、また溶接のみならず図5に示すようにボルト・ナッ
トによって結合鋼管2に結合することもできる。Shaped steel is used as the connecting steel material 6, and it is placed not only on the side surface of the joint steel pipe 2 but also on the top portion as shown in FIG. 4, and not only for welding but also for bolts and nuts as shown in FIG. It can also be joined to the joined steel pipe 2.
【0015】[0015]
【発明の作用・効果】このようにこの発明は以上の構成
からなり、大地震による外力で破壊する箇所が特定さ
れ、この破壊境界部分をどのように強化するか、また建
築物等の設計に際し、大地震時に耐える能力をどの程度
であるかを見積もって設計することが可能になるのであ
る。また施工工程が簡明になって手間がかからないの
で、工期が早くなることと、それに伴ってコストの安い
結合方法を提供できる。またこの発明の結合鋼管を使用
することにより杭頭部のフーチングの埋込みをなくする
ことができる。したがってフーチング下端筋の配筋が容
易となる。As described above, according to the present invention having the above-mentioned constitution, the portion to be destroyed by the external force due to the large earthquake is specified, and how to strengthen the fracture boundary portion and design the building or the like. , It becomes possible to design by estimating how much the ability to withstand a large earthquake. In addition, since the construction process is simple and requires no effort, it is possible to provide a coupling method in which the construction period is shortened and the cost is accordingly reduced. Further, by using the bonded steel pipe of the present invention, it is possible to eliminate the embedding of footing in the pile head. Therefore, it is easy to arrange the bottom foot of the footing.
【0016】図7aの杭径程度フーチングへ埋め込む従
来の結合方法の場合、図7(a) に示すように杭のある部
分にフーチングの下端筋を配筋することができないの
で、斜め補強筋が必要となり手間がかかる。この発明の
場合、埋め込み結合鋼管は杭径より相当小さくなるの
で、フーチング下端筋を配筋できない部分が少なくな
り、斜め補強筋も必ずしも必要としなくなる。In the case of the conventional connection method of embedding the pile diameter in the footing of FIG. 7a, the bottom reinforcement of the footing cannot be arranged in the portion where the pile is present as shown in FIG. It is necessary and time consuming. In the case of the present invention, since the embedded jointed steel pipe is considerably smaller than the pile diameter, the portion where the footing lower end bar cannot be arranged is reduced, and the diagonal reinforcing bar is not necessarily required.
【0017】フーチングと鋼管杭の結合部は、地震時お
ける地盤の水平変位と構造物の水平変位の両者の影響を
吸収する性能が要求される箇所である。この結合部は図
1にみられるように杭1の剛性とフーチング4の剛性に
比較して、径の小さい結合鋼管のみとなるので剛性が小
さいこととと、鋼管の中にコンクリートが充填された鋼
管構造となるので、変形性能が大きいという特徴があ
る。その結果大地震等による外力に対し、フーチングと
杭の接合境界で破壊が先行するように設計することがで
きる。The joint between the footing and the steel pipe pile is a part that is required to have the ability to absorb the effects of both the horizontal displacement of the ground and the horizontal displacement of the structure during an earthquake. As shown in FIG. 1, the joint portion has only a joint steel pipe with a smaller diameter than the rigidity of the pile 1 and the rigidity of the footing 4, and the rigidity is small, and the steel pipe was filled with concrete. Since it has a steel pipe structure, it is characterized by high deformation performance. As a result, it is possible to design the failure to precede the external force due to a large earthquake at the joint boundary between the footing and the pile.
【0018】図6aに示すように従来構造のフーチング
では、フーチング内に生じるせん断応力に対し、コンク
リートのせん断強度が弱いため、その厚みが大きくな
る。これに対しこの発明では結合鋼管間を剛性の大きい
連結鋼材で接続した状態でフーチングコンクリート中に
定着してあり、図6bに示すように剛性の大きい連結鋼
材がフーチングに作用する剪断力を負担するので、フー
チングの厚みを薄くすることができる。As shown in FIG. 6a, in the footing of the conventional structure, the shear strength of the concrete is weak with respect to the shear stress generated in the footing, so that the thickness thereof becomes large. On the other hand, in the present invention, the joint steel pipes are fixed in the footing concrete in the state of being connected by the connecting steel material having high rigidity, and the connecting steel material having high rigidity bears the shearing force acting on the footing as shown in FIG. 6b. Therefore, the footing can be made thinner.
【図1】この発明の実施例の縦断面図である。FIG. 1 is a vertical sectional view of an embodiment of the present invention.
【図2】この発明の他の実施例の縦断面図である。FIG. 2 is a vertical sectional view of another embodiment of the present invention.
【図3】図2の横断面図である。3 is a cross-sectional view of FIG.
【図4】この発明の変形例の縦断面図である。FIG. 4 is a vertical sectional view of a modified example of the present invention.
【図5】この発明の変形例の横断面図である。FIG. 5 is a cross-sectional view of a modified example of the present invention.
【図6】aは従来例,bはこの発明の作用説明図であ
る。FIG. 6A is a conventional example, and b is an explanatory view of the operation of the present invention.
【図7】aは従来例,bはこの発明のフーチング下端筋
の配筋図である。7A is a conventional example, and FIG. 7B is a bar arrangement diagram of a footing lower end streak of the present invention.
【図8】a,bは従来例の縦断面図である。8A and 8B are vertical sectional views of a conventional example.
【符号の説明】
1…杭、2…結合鋼管、3…モルタル類、4…フーチン
グ、5…突起、6…連結鋼材。[Explanation of Codes] 1 ... Pile, 2 ... Combined steel pipe, 3 ... Mortars, 4 ... Footing, 5 ... Projection, 6 ... Connection steel material.
Claims (2)
径の結合鋼管の下部を挿入し、その結合鋼管内および結
合鋼管と鋼管杭の間隙にモルタル類を中詰めすることに
よって固定し、杭頭部から突出した結合鋼管上部を杭頭
部上方のフーチングコンクリート内に定着し、杭頭とフ
ーチングの接合部の変形性能を大きく構成してなること
を特徴とする鋼管杭とフーチングの結合部構造。1. A steel pipe pile head is fixed by inserting a lower portion of a joint steel pipe having a diameter smaller than the pile diameter into the hollow portion, and filling mortar inside the joint steel pipe and in the gap between the joint steel pipe and the steel pipe pile. However, the joint steel pipe upper part protruding from the pile head is anchored in the footing concrete above the pile head, and the deformation performance of the joint between the pile head and footing is configured to be large. Joint structure.
コネクターとなる多数の突起を設けた請求項1記載の鋼
管杭とフーチングの結合部構造。2. The joint structure between a steel pipe pile and a footing according to claim 1, wherein a large number of projections serving as shear connectors are provided on the inner surface of the steel pipe pile and the outer surface of the joint steel pipe.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19998898A JP3418677B2 (en) | 1998-07-15 | 1998-07-15 | Joint structure of steel pipe pile and footing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19998898A JP3418677B2 (en) | 1998-07-15 | 1998-07-15 | Joint structure of steel pipe pile and footing |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2000027197A JP2000027197A (en) | 2000-01-25 |
JP3418677B2 true JP3418677B2 (en) | 2003-06-23 |
Family
ID=16416933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19998898A Expired - Fee Related JP3418677B2 (en) | 1998-07-15 | 1998-07-15 | Joint structure of steel pipe pile and footing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP3418677B2 (en) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4778805B2 (en) * | 2006-02-14 | 2011-09-21 | 株式会社播磨商事 | Construction method of foundation pile |
JP2009007746A (en) * | 2007-06-26 | 2009-01-15 | Shimizu Corp | Joint structure of pile head |
JP5133103B2 (en) * | 2008-03-24 | 2013-01-30 | 岡部株式会社 | Pile head joint connecting material and pile head joint structure using the same |
JP5691507B2 (en) * | 2010-12-27 | 2015-04-01 | 株式会社大林組 | Structure and method for joining steel pipe pile and foundation |
JP5785476B2 (en) * | 2011-11-02 | 2015-09-30 | 三井住友建設株式会社 | Reinforcing method and structure of existing foundation |
JP5966442B2 (en) * | 2012-03-01 | 2016-08-10 | Jfeスチール株式会社 | Pile head structure, pier structure using the same, and repair method thereof |
JP6241325B2 (en) * | 2014-03-07 | 2017-12-06 | 新日鐵住金株式会社 | Levee body, dam body component and method of constructing dam body |
-
1998
- 1998-07-15 JP JP19998898A patent/JP3418677B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JP2000027197A (en) | 2000-01-25 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20000208 |
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LAPS | Cancellation because of no payment of annual fees |