JP2006083609A - Joint structure of pile head section and its construction method - Google Patents

Joint structure of pile head section and its construction method Download PDF

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JP2006083609A
JP2006083609A JP2004269934A JP2004269934A JP2006083609A JP 2006083609 A JP2006083609 A JP 2006083609A JP 2004269934 A JP2004269934 A JP 2004269934A JP 2004269934 A JP2004269934 A JP 2004269934A JP 2006083609 A JP2006083609 A JP 2006083609A
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pile head
steel pipe
pile
outer steel
gap
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JP4430496B2 (en
Inventor
Kazuhiko Isoda
和彦 磯田
Akira Otsuki
明 大槻
Keiji Nakanishi
啓二 中西
Hiromasa Tanaka
宏征 田中
Yoichi Kobayashi
洋一 小林
Yukihiro Kurio
幸弘 栗生
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Shimizu Construction Co Ltd
Nippon Steel Corp
Shimizu Corp
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Shimizu Construction Co Ltd
Sumitomo Metal Industries Ltd
Shimizu Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint structure of a pile head section, which enhances constructibility and quality and which enables the shortening of a construction period and a reduction in cost, and a construction method for the pile head. <P>SOLUTION: This joint structure of the pile head section is intended for a pile 1, the outer peripheral section of which is composed of a steel pipe, such as a steel pipe pile, an SC pile (prefabricated concrete pile covered with the steel pipe), and a concrete-filled steel pipe pile. A plurality of vertical ribs 3 etc. are radially welded to an outer peripheral surface of the pile head section 2 at each angle of 45° from the center of the cross section of the pile 1. Leading ends of the adjacent vertical ribs 3 and 3 are welded to a steel plate 4a, so as to form an outer steel pipe 4 in an octagonal shape in plan view. A plurality of anchor bars 6 etc., which are to be embedded in a foundation, are welded to an upper outer peripheral surface of the outer steel pipe 4 at predetermined intervals. A filler 7, which is composed of concrete, soil mortar, mortar, etc., is infilled into a gap between the outer steel pipe 4 and the pile head section 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、杭頭部の接合構造およびその施工方法に関する。   The present invention relates to a pile head joint structure and a construction method thereof.

従来より、コンクリート充填鋼管杭や鋼管杭と基礎梁とを接合する際の杭頭部の接合構造としては、例えば、杭頭部の内部にアンカー筋の一端を挿入して固定する内籠方式や、杭頭部の外周面にアンカー筋の一端を溶接するひげ筋方式がある。あるいは、杭頭部の外周面に装着されたカプラーにねじ鉄筋を固定するカプラー方式(特許文献1参照)や、杭頭部よりひと回り大きな外鋼管を杭頭部に巻装して杭頭部と外鋼管との間にコンクリートを充填するとともに、当該コンクリートにアンカー筋の一端を埋設する二重鋼管方式(特許文献2、3参照)が提案されている。
特公平3−54736号公報 (第1−2頁、第5図) 特開平11−13139号公報 (第3−4頁、第1図) 特開2000−297472号公報 (第2−3頁、第1図)
Conventionally, as a joint structure of a pile head when joining a concrete-filled steel pipe pile or a steel pipe pile and a foundation beam, for example, an inner anchor method in which one end of an anchor bar is inserted and fixed inside the pile head, There is a whisker muscle method in which one end of an anchor bar is welded to the outer peripheral surface of the pile head. Alternatively, a coupler method (see Patent Document 1) for fixing screw reinforcing bars to a coupler mounted on the outer peripheral surface of the pile head, or an outer steel pipe that is slightly larger than the pile head is wound around the pile head and There has been proposed a double steel pipe system (see Patent Documents 2 and 3) in which concrete is filled between the outer steel pipe and one end of an anchor bar is embedded in the concrete.
Japanese Patent Publication No. 3-54736 (Page 1-2, Fig. 5) Japanese Patent Laid-Open No. 11-13139 (page 3-4, FIG. 1) JP 2000-297472 A (page 2-3, FIG. 1)

しかしながら、従来の杭頭部の接合構造では以下のような問題が存在する。
内籠方式では、杭頭部に大きな曲げモーメントが生じる場合に、アンカー筋が過密配筋となり、施工性に劣るという問題がある。しかも、アンカー筋が杭頭部の内部に配置されるため、曲げに対してアンカー筋の断面効率が悪く、杭頭固定時に生じる杭頭応力に対処できない場合が多い。
また、ひげ筋方式では、アンカー筋が杭頭部の外周面に溶接されるため、内籠方式と比較して断面効率が高いものの、現場での施工性や溶接品質に課題があるだけでなく、杭頭曲げ応力が大きくなると必要数のアンカー筋を配置しきれず、杭頭固定時の杭頭応力を処理できない場合がある。
さらに、カプラー方式では、現場溶接が不要でアンカー筋の取り付けが容易なことから施工性および品質ともに向上するものの、カプラーが高価なため工費が増大しやすい。また、杭頭曲げ応力が大きくなると必要数のアンカー筋を配置しきれず、杭頭固定時の杭頭応力を処理できない場合がある。
さらにまた、二重鋼管方式では、内籠方式やひげ筋方式あるいは カプラー方式と比較して、杭体 の中立軸からアンカー筋までの距離が大幅には 大きくならないため、アンカー筋の軸力負担はさほど 軽減されない 。また 、アンカー筋を杭頭部 と外鋼管 との間の コンクリートに定着することから、定着長を確保するために外鋼管の長さが長くなり、コストアップの要因となり易いといった問題がある 。
However, the conventional pile head joint structure has the following problems.
In the inner saddle method, when a large bending moment is generated at the pile head, the anchor bars become overcrowded and there is a problem that the workability is inferior. In addition, since the anchor bars are arranged inside the pile head, the cross-section efficiency of the anchor bars is poor with respect to bending, and it is often impossible to cope with the pile head stress generated when the pile head is fixed.
In addition, in the beard muscle method, anchor bars are welded to the outer peripheral surface of the pile head, so the cross-sectional efficiency is higher compared to the inner collar method, but there are not only problems with workability and welding quality on site. When the pile head bending stress increases, the necessary number of anchor bars cannot be arranged, and the pile head stress at the time of fixing the pile head may not be processed.
Further, in the coupler method, on-site welding is not required and anchor bars can be easily attached, so that both workability and quality are improved. However, since the coupler is expensive, the construction cost is likely to increase. Moreover, when pile head bending stress becomes large, a required number of anchor bars cannot be arranged, and pile head stress at the time of pile head fixation may not be processed.
Furthermore, in the double steel pipe method, the distance from the neutral axis of the pile body to the anchor bar is not significantly increased compared to the inner rod method, the whiskers method, or the coupler method. Not much reduced. In addition, since anchor bars are anchored to the concrete between the pile head and the outer steel pipe, there is a problem that the length of the outer steel pipe becomes long in order to secure the anchoring length, which tends to increase costs.

本発明は、上述する問題点に鑑みてなされたもので、 施工性および品質 が向上し、且つ、工期短縮とコストダウンが図れる杭頭部の接合構造およびその施工方法を提供することを目的とする。   The present invention has been made in view of the above-described problems, and has an object to provide a pile head joint structure that improves workability and quality, shortens the work period, and reduces the cost, and its construction method. To do.

上記目的を達成するため、本発明に係る杭頭部の接合構造は、鋼管杭または鋼管が巻装された杭を構造物の基礎(フーチングまたは基礎梁)に接合するための杭頭部の接合構造であって、前記基礎に埋設される複数のアンカー筋を外周部に有し、前記杭頭部を囲繞する平面視多角形状の外鋼管と、前記杭頭部の外周面に放射状に配設され当該杭頭部と前記外鋼管との間に架設される複数の鉛直リブとを備え、前記杭頭部と前記外鋼管との間隙には充填材が充填されていることを特徴とする。
本発明では、杭頭部と外鋼管とを繋ぐ複数の鉛直リブを設けることにより、杭の曲げを鉛直リブを介して外鋼管に円滑に伝達することができる。その結果、杭頭部と外鋼管との間隙に充填される充填材の効果を期待せずに、杭頭部と外鋼管とを一体化することができる。一方、充填材に要求される機能は、鋼材の防錆と座屈防止のみとなるため、充填材の充填性や品質管理に特別な配慮を払う必要がなくなる。
In order to achieve the above object, a pile head joint structure according to the present invention is a pile head joint for joining a steel pipe pile or a pile around which a steel pipe is wound to a foundation (footing or foundation beam) of a structure. The structure has a plurality of anchor bars embedded in the foundation at the outer peripheral portion, and is arranged radially on the outer peripheral surface of the pile head and a polygonal outer steel pipe surrounding the pile head. And a plurality of vertical ribs provided between the pile head and the outer steel pipe, and a gap between the pile head and the outer steel pipe is filled with a filler.
In this invention, the bending of a pile can be smoothly transmitted to an outer steel pipe via a vertical rib by providing the some vertical rib which connects a pile head and an outer steel pipe. As a result, the pile head and the outer steel pipe can be integrated without expecting the effect of the filler filled in the gap between the pile head and the outer steel pipe. On the other hand, since the functions required of the filler are only rust prevention and buckling prevention of the steel material, it is not necessary to pay special attention to the filling property and quality control of the filler.

また、本発明に係る杭頭部の接合構造では、前記杭頭部と前記外鋼管との間隙を閉塞するように当該間隙の上端面および/または下端面にダイアフラムが設置されていてもよい。   In the pile head joint structure according to the present invention, a diaphragm may be provided on the upper end surface and / or the lower end surface of the gap so as to close the gap between the pile head and the outer steel pipe.

また、本発明に係る杭頭接合部の施工方法は、上記の接合構造を有する杭頭部の施工方法であって、前記杭頭部の外周面に複数の鉛直リブを放射状に配設する第一の工程と、隣接する前記鉛直リブ間に鋼板を架設し、前記杭頭部を囲繞する平面視多角形状の外鋼管を形成する第二の工程と、前記杭頭部と前記外鋼管との間隙に充填材を充填する第三の工程と、前記外鋼管の外周部にアンカー筋を配設する第四の工程とを備えることを特徴とする。
本発明では、杭の打設に先立ち、予め工場等で杭頭部に外鋼管を装着しておくので、安定した品質を低コストで実現することができる。しかも、特別な技量や工具も不要なため、施工時間を短縮することができる。
Moreover, the construction method of the pile head joint part which concerns on this invention is a construction method of the pile head which has said joining structure, Comprising: The several vertical rib is arrange | positioned radially on the outer peripheral surface of the said pile head. A first step, a second step of laying a steel plate between the adjacent vertical ribs to form a polygonal outer steel pipe surrounding the pile head, and the pile head and the outer steel pipe. A third step of filling the gap with a filler and a fourth step of disposing anchor bars on the outer peripheral portion of the outer steel pipe are characterized.
In the present invention, since the outer steel pipe is attached to the pile head in advance in a factory or the like prior to the pile placement, stable quality can be realized at low cost. Moreover, since no special skills or tools are required, the construction time can be shortened.

また、本発明に係る杭頭接合部の施工方法では、前記第二の工程と前記第三の工程の間に、前記杭頭部と前記外鋼管との間隙を閉塞するように当該間隙の上端面および/または下端面にダイアフラムを設置してもよい。
本発明では、杭頭部と外鋼管との間隙に充填材を充填する前に、当該間隙を閉塞するダイアフラムを設置するので、充填材が間隙から流れ出ないように別途処置する必要がなくなり、充填材の充填が容易となる。
Further, in the construction method of the pile head joint according to the present invention, the gap head is closed between the second step and the third step so as to close the gap between the pile head and the outer steel pipe. You may install a diaphragm in an end surface and / or a lower end surface.
In the present invention, before the filler is filled in the gap between the pile head and the outer steel pipe, a diaphragm for closing the gap is installed, so that it is not necessary to separately treat the filler so that it does not flow out of the gap. Filling of the material becomes easy.

本発明によれば、杭頭部と外鋼管とを繋ぐ複数の鉛直リブを設けることにより、杭の曲げを鉛直リブを介して外鋼管に円滑に伝達することができる。そのため、充填材に要求される機能は、鋼材の防錆と座屈防止のみとなり、充填材の充填性や品質管理に特別な配慮を払う必要がなくなる。
また、本発明によれば、杭の打設に先立ち、予め工場等で外鋼管を杭頭部に装着しておくので、安定した品質を低コストで実現することができる。しかも、特別な技量や工具も不要なため、施工時間を短縮することができる。
ADVANTAGE OF THE INVENTION According to this invention, the bending of a pile can be smoothly transmitted to an outer steel pipe via a vertical rib by providing the several vertical rib which connects a pile head and an outer steel pipe. Therefore, the functions required of the filler are only rust prevention and buckling prevention of the steel material, and it is not necessary to pay special attention to the filling property and quality control of the filler.
Further, according to the present invention, since the outer steel pipe is attached to the pile head in advance at a factory or the like prior to the driving of the pile, stable quality can be realized at low cost. Moreover, since no special skills or tools are required, the construction time can be shortened.

以下、本発明に係る杭頭部の接合構造の実施形態について図面に基いて説明する。
[杭頭部の接合構造]
図1は、本発明に係る杭頭部の接合構造の第一の実施形態を示す斜視図である。また、図2は、その平面図およびA−A矢視断面図である。
本発明に係る杭頭部の接合構造は、鋼管杭、SC杭(鋼管で被覆した既製コンクリート杭)、コンクリート充填鋼管杭など外周部が鋼管からなる杭1を対象とし、杭1断面の中心から45度ごとに放射状に複数の鉛直リブ3…が杭頭部2の外周面に溶接されている。また、隣接する鉛直リブ3、3の先端部同士は鋼板4aに溶接され、平面視八角形状の外鋼管4を形成している。外鋼管4の上部外周面には、基礎(図示省略)に埋設される複数のアンカー筋6…が所定の間隔をおいて溶接されている。
一方、外鋼管4と杭頭部2との間隙には、鋼材の防錆と座屈防止のために、コンクリート、ソイルモルタル、モルタル等からなる充填材7が充填されている。
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a pile head joint structure according to the present invention will be described with reference to the drawings.
[Pile head joint structure]
FIG. 1 is a perspective view showing a first embodiment of a pile head joint structure according to the present invention. Moreover, FIG. 2 is the top view and AA arrow sectional drawing.
The joint structure of the pile head according to the present invention is for a pile 1 whose outer peripheral portion is made of a steel pipe, such as a steel pipe pile, an SC pile (a prefabricated concrete pile covered with a steel pipe), and a concrete-filled steel pipe pile. A plurality of vertical ribs 3 are radially welded to the outer peripheral surface of the pile head 2 every 45 degrees. Moreover, the front-end | tip parts of the adjacent vertical ribs 3 and 3 are welded to the steel plate 4a, and form the outer steel pipe 4 of a planar view octagonal shape. A plurality of anchor bars 6 embedded in a foundation (not shown) are welded to the upper outer peripheral surface of the outer steel pipe 4 at a predetermined interval.
On the other hand, the gap between the outer steel pipe 4 and the pile head 2 is filled with a filler 7 made of concrete, soil mortar, mortar or the like in order to prevent rust and buckling of the steel material.

鉛直リブ3は、杭径Dの0.25倍程度の幅と0.5〜1.0倍程度の長さ(鉛直リブ3と杭頭部2とのラップ長)を有する矩形状の鋼板である。同様に、外鋼管4を構成する鋼板4aも、鉛直リブ3と同じ長さを有する矩形状の鋼板である。   The vertical rib 3 is a rectangular steel plate having a width of about 0.25 times the pile diameter D and a length of about 0.5 to 1.0 times (wrap length between the vertical rib 3 and the pile head 2). is there. Similarly, the steel plate 4 a constituting the outer steel pipe 4 is also a rectangular steel plate having the same length as the vertical rib 3.

アンカー筋6としては、通常の鉄筋を用いる他に、先端に拡径部を有するTヘッドバーや定着プレートを鉄筋の先端に溶接等で固着したアンカー筋を用いることにより定着強度を増大させ、アンカー長を短くすることができる。
また、アンカー筋6を外鋼管4にフレア溶接する代わりに、雌ねじを有するカプラーや袋ナット等を予め工場等で外鋼管4の上部外周面に溶接しておいてもよい。これにより、杭1施工時にアンカー筋6がなくなり、中掘り工法も容易に施工でき、杭頭斫り時にアンカー筋6がないため施工能率が向上する。
As the anchor bars 6, in addition to using normal reinforcing bars, anchor strength is increased by using a T head bar having a diameter-expanded portion at the tip or an anchor bar in which a fixing plate is fixed to the tip of the reinforcing bar by welding or the like. The length can be shortened.
Instead of flaring the anchor bar 6 to the outer steel pipe 4, a coupler having a female thread, a cap nut, or the like may be welded to the upper outer peripheral surface of the outer steel pipe 4 in advance at a factory or the like. Thereby, the anchor reinforcement 6 is eliminated when the pile 1 is constructed, and the medium digging method can be easily constructed, and the construction efficiency is improved because there is no anchor reinforcement 6 when the pile head is rolled.

図3は、本発明に係る杭頭部の接合構造の第二の実施形態を示す斜視図である。また、図4は、その平面図およびA−A矢視断面図である。
本実施形態では、第一の実施形態に加えて、杭頭部2と外鋼管4との間隙を閉塞するように当該間隙の上端面および下端面にそれぞれダイアフラム5が設置されており、外鋼管4とダイアフラム5によって杭頭部2のせん断力を円滑に外鋼管4に伝達することができる。
ここでは、鉛直リブ3で仕切られた間隙について一つおきにダイアフラム5が設置されているが、鉛直リブ3で仕切られた全ての間隙にダイアフラム5を設置してもよい。また、間隙の下端面のみにダイアフラム5を設置してもよい。
FIG. 3 is a perspective view showing a second embodiment of a pile head joint structure according to the present invention. Moreover, FIG. 4 is the top view and AA arrow sectional drawing.
In this embodiment, in addition to the first embodiment, diaphragms 5 are respectively installed on the upper end surface and the lower end surface of the gap so as to close the gap between the pile head 2 and the outer steel pipe 4. The shear force of the pile head 2 can be smoothly transmitted to the outer steel pipe 4 by the 4 and the diaphragm 5.
Here, every other gap 5 is provided for the gaps partitioned by the vertical ribs 3, but the diaphragms 5 may be installed in all the gaps partitioned by the vertical ribs 3. Further, the diaphragm 5 may be provided only on the lower end surface of the gap.

本実施形態による杭頭部の接合構造では、杭頭部2と外鋼管4とを繋ぐ複数の鉛直リブ3…を設けることにより、杭1の曲げを鉛直リブ3を介して外鋼管4に円滑に伝達することができる。その結果、杭頭部2と外鋼管4との間隙に充填される充填材7の効果を期待せずに、杭頭部2と外鋼管4とを一体化することができる。一方、充填材7に要求される機能は、鋼材の防錆と座屈防止のみとなるため、充填材7の充填性や品質管理に特別な配慮を払う必要がなくなる。
また、本実施形態による杭頭部の接合構造では、外鋼管4の外周部にアンカー筋6を配設するので、 従来のひげ筋方式や内籠方式と比較して、 アンカー筋6 の配置径を大きくすることができ 、しかも、 その大きさを 外鋼管4 の断面径によって自在に調整できるため、過密配筋を解消することが できる。これにより、杭頭部2 の曲げ耐力や引抜き耐力を容易に増大することができ、無理なく杭頭部2 の接合構造の高耐力化を図ることが可能となる。その結果、杭頭接合部の損傷が無く、杭体に降伏部位を発生させる杭頭構造とすることができる。即ち、靭性指向の杭に最適な接合構造であり、細径の杭を採用して合理的な杭設計が可能となる。
さらに、本実施形態による杭頭部の接合構造では、 アンカー筋6 の配置形状が八角形で、従来の円形配置よりも基礎配筋との干渉が生じにくく、配置径が大きくなることで アンカー筋6 の本数も低減できるため、基礎の施工は大幅に容易になる。
加えて、本実施形態による杭頭部の接合構造では、杭頭部2と外鋼管4のラップ長が杭径Dの0.5〜1.0倍程度と、従来工法の半分以下のラップ長でよいため、材料や掘削土量の大幅な低減につながる。
In the pile head joint structure according to the present embodiment, by providing a plurality of vertical ribs 3 that connect the pile head 2 and the outer steel pipe 4, the bending of the pile 1 is smoothly performed on the outer steel pipe 4 via the vertical rib 3. Can be communicated to. As a result, the pile head 2 and the outer steel pipe 4 can be integrated without expecting the effect of the filler 7 filled in the gap between the pile head 2 and the outer steel pipe 4. On the other hand, since the functions required of the filler 7 are only rust prevention and buckling prevention of the steel material, it is not necessary to pay special attention to the filling property and quality control of the filler 7.
Moreover, in the joint structure of the pile head according to the present embodiment, the anchor bars 6 are arranged on the outer peripheral portion of the outer steel pipe 4, so that the arrangement diameter of the anchor bars 6 is smaller than that of the conventional beard bar method or inner collar method. Furthermore, since the size can be freely adjusted according to the cross-sectional diameter of the outer steel pipe 4, overcrowding can be eliminated. As a result, the bending strength and the pulling strength of the pile head 2 can be easily increased, and the strength of the joint structure of the pile head 2 can be increased without difficulty. As a result, there is no damage to the pile head joint, and a pile head structure that generates a yield site in the pile body can be obtained. In other words, it is an optimum joint structure for a tough-oriented pile, and a rational pile design is possible by adopting a thin pile.
Furthermore, in the pile head joint structure according to the present embodiment, the anchor bar 6 is arranged in an octagonal shape, and interference with the base bar arrangement is less likely to occur than in the conventional circular arrangement. Since the number of 6 can also be reduced, the construction of the foundation is greatly facilitated.
In addition, in the joint structure of the pile head according to the present embodiment, the lap length of the pile head 2 and the outer steel pipe 4 is about 0.5 to 1.0 times the pile diameter D, and is less than half the lap length of the conventional method. As a result, the material and excavated soil volume can be greatly reduced.

[杭頭接合部の施工方法]
次に、本発明に係る杭頭接合部の施工方法について説明する。
図5は、本発明に係る杭頭接合部の施工方法を順を追って示したものである。
先ず、予め工場等で、杭1断面の中心から45度ごとに放射状に複数の鉛直リブ3…を杭頭部2の外周面に溶接する(図5(a)参照)。
次いで、隣接する鉛直リブ3、3の先端部同士を鋼板4aによって繋いで杭頭部2を囲繞する平面視八角形状の外鋼管4を形成し(図5(b)参照)、外鋼管4と杭頭部2との間隙に充填材7を充填する(図5(c)参照)。
そして杭打設現場において、杭頭部2に外鋼管4が装着された杭1を打設し、外鋼管4が露頭するまで掘削し、外鋼管4の外周部にアンカー筋6を溶接する((図5(d)参照)。
その後、外鋼管4の周囲Rを埋め戻し、杭頭部2上に基礎(図示省略)を構築する。
[Pile head joint construction method]
Next, the construction method of the pile head joint part concerning this invention is demonstrated.
FIG. 5 shows the construction method of the pile head joint according to the present invention in order.
First, in a factory or the like, a plurality of vertical ribs 3 are radially welded to the outer peripheral surface of the pile head 2 every 45 degrees from the center of the cross section of the pile 1 (see FIG. 5A).
Next, the outer steel pipe 4 having an octagonal shape in plan view that surrounds the pile head 2 is formed by connecting the tips of the adjacent vertical ribs 3 and 3 with a steel plate 4a (see FIG. 5B), Filler 7 is filled in the gap with the pile head 2 (see FIG. 5C).
Then, at the pile driving site, the pile 1 with the outer steel pipe 4 attached to the pile head 2 is driven, excavated until the outer steel pipe 4 is exposed, and the anchor bars 6 are welded to the outer periphery of the outer steel pipe 4 ( (See FIG. 5 (d)).
Thereafter, the periphery R of the outer steel pipe 4 is backfilled, and a foundation (not shown) is constructed on the pile head 2.

なお、杭頭部2と外鋼管4との間隙にダイアフラム5を設置する場合は、外鋼管4の形成後、且つ充填材7の充填前にダイアフラム5を設置し、ダイアフラム5に設けた充填孔(図示省略)より充填材7を間隙に充填する。   In addition, when installing the diaphragm 5 in the gap | interval of the pile head 2 and the outer steel pipe 4, the diaphragm 5 is installed after formation of the outer steel pipe 4 and before filling of the filler 7, and the filling hole provided in the diaphragm 5 is provided. Filler 7 is filled with filler 7 (not shown).

本実施形態による杭頭接合部の施工方法では、杭1の打設に先立ち、予め工場等で外鋼管4を杭頭部2に装着しておくので、安定した品質を低コストで実現することができる。しかも、杭頭部2に取り付ける補強鋼材は全て鋼板だけから成っており、プレス加工も必要ないため、製作期間を短縮でき、併せてコストダウンを図ることができる。   In the construction method of the pile head joint portion according to the present embodiment, the outer steel pipe 4 is mounted on the pile head 2 in advance at the factory or the like prior to placing the pile 1, so that stable quality can be realized at low cost. Can do. Moreover, all the reinforcing steel materials to be attached to the pile head 2 are made of only steel plates, and no press work is required, so that the production period can be shortened and the cost can be reduced.

以上、本発明に係る杭頭部の接合構造の実施形態について説明したが、本発明は上記の実施形態に限定されるものではなく、その趣旨を逸脱しない範囲で適宜変更可能である。例えば、上記の実施形態では、外鋼管は平面視八角形であるが、四角形や六角形など他の多角形でもよいことは言うまでもない。また、上記の実施形態では、外鋼管と杭頭部との間隙に充填材を充填してから杭を打設したが、外鋼管と杭頭部との間隙に土砂が入らないように養生してから杭を打設し、基礎施工時に基礎コンクリートと一緒に間隙が充填されるようにしてもよい。要は、本発明において所期の機能が得られればよいのである。   As mentioned above, although embodiment of the joining structure of the pile head concerning this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. For example, in the above embodiment, the outer steel pipe has an octagonal shape in plan view, but it goes without saying that it may be another polygon such as a quadrangle or a hexagon. In the above embodiment, the pile is placed after filling the gap between the outer steel pipe and the pile head. However, the pile is placed so as not to enter the gap between the outer steel pipe and the pile head. After that, piles may be laid and the gap filled with the foundation concrete during foundation construction. In short, it is only necessary to obtain the desired function in the present invention.

本発明に係る杭頭部の接合構造の第一の実施形態を示す斜視図である。It is a perspective view which shows 1st embodiment of the joining structure of the pile head which concerns on this invention. 同、(a)は平面図、(b)はA−A矢視断面図である。(A) is a top view and (b) is an AA arrow sectional drawing. 本発明に係る杭頭部の接合構造の第二の実施形態を示す斜視図である。It is a perspective view which shows 2nd embodiment of the junction structure of the pile head which concerns on this invention. 同、(a)は平面図、(b)はA−A矢視断面図である。(A) is a top view and (b) is an AA arrow sectional drawing. 本発明に係る杭頭接合部の施工方法を示す立断面図である。It is an elevation sectional view showing a construction method of a pile head junction concerning the present invention.

符号の説明Explanation of symbols

1 杭
2 杭頭部
3 鉛直リブ
4 外鋼管
4a 鋼板
5 ダイアフラム
6 アンカー筋
7 充填材
DESCRIPTION OF SYMBOLS 1 Pile 2 Pile head 3 Vertical rib 4 Outer steel pipe 4a Steel plate 5 Diaphragm 6 Anchor reinforcement 7 Filler

Claims (4)

鋼管杭または鋼管が巻装された杭を構造物の基礎に接合するための杭頭部の接合構造であって、
前記基礎に埋設される複数のアンカー筋を外周部に有し、前記杭頭部を囲繞する平面視多角形状の外鋼管と、前記杭頭部の外周面に放射状に配設され、当該杭頭部と前記外鋼管との間に架設される複数の鉛直リブとを備え、前記杭頭部と前記外鋼管との間隙には充填材が充填されていることを特徴とする杭頭部の接合構造。
A pile head joint structure for joining a steel pipe pile or a pile wrapped with a steel pipe to the foundation of a structure,
A plurality of anchor bars embedded in the foundation on the outer periphery, a polygonal outer steel pipe surrounding the pile head, and radially disposed on the outer peripheral surface of the pile head, the pile head A pile head joint comprising: a plurality of vertical ribs erected between a section and the outer steel pipe, and a gap between the pile head and the outer steel pipe is filled with a filler. Construction.
前記杭頭部と前記外鋼管との間隙を閉塞するように当該間隙の上端面および/または下端面にダイアフラムが設置されていることを特徴とする請求項1に記載の杭頭部の接合構造。   2. The pile head joint structure according to claim 1, wherein a diaphragm is installed on an upper end surface and / or a lower end surface of the gap so as to close the gap between the pile head and the outer steel pipe. . 請求項1または2に記載の接合構造を有する杭頭部の施工方法であって、
前記杭頭部の外周面に複数の鉛直リブを放射状に配設する第一の工程と、
隣接する前記鉛直リブ間に鋼板を架設し、前記杭頭部を囲繞する平面視多角形状の外鋼管を形成する第二の工程と、
前記杭頭部と前記外鋼管との間隙に充填材を充填する第三の工程と、
前記外鋼管の外周部にアンカー筋を配設する第四の工程とを備えることを特徴とする杭頭接合部の施工方法。
A method for constructing a pile head having the joint structure according to claim 1 or 2,
A first step of radially arranging a plurality of vertical ribs on the outer peripheral surface of the pile head;
A second step of laying a steel plate between the adjacent vertical ribs to form a polygonal outer steel pipe that surrounds the pile head; and
A third step of filling a filler in the gap between the pile head and the outer steel pipe;
And a fourth step of disposing an anchor bar on the outer peripheral portion of the outer steel pipe.
前記第二の工程と前記第三の工程の間に、
前記杭頭部と前記外鋼管との間隙を閉塞するように当該間隙の上端面および/または下端面にダイアフラムを設置することを特徴とする請求項3に記載の杭頭接合部の施工方法。
Between the second step and the third step,
The construction method of a pile head joint according to claim 3, wherein a diaphragm is installed on the upper end surface and / or the lower end surface of the gap so as to close the gap between the pile head and the outer steel pipe.
JP2004269934A 2004-09-16 2004-09-16 Pile head joint structure and construction method Expired - Fee Related JP4430496B2 (en)

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KR101165445B1 (en) * 2009-12-28 2012-07-12 재단법인 포항산업과학연구원 Steel pipe pile and construciton method thereof
CN104153384A (en) * 2014-08-22 2014-11-19 熊翱 On-sea sandwich steel pipe pile foundation and construction method
CN104612173A (en) * 2015-01-29 2015-05-13 福州大学 Novel jointless bridge structure comprising ultra-high performance concrete piles and construction method thereof
JP2016023538A (en) * 2014-07-24 2016-02-08 三谷セキサン株式会社 Connection structure between existing pile and structure on ground
CN106836260A (en) * 2016-12-16 2017-06-13 兰州理工大学 A kind of crawler belt steel-pipe pile and construction method for reducing negative friction
JP2018071056A (en) * 2016-10-24 2018-05-10 岡部株式会社 Pile head reinforcement structure
JP2018071055A (en) * 2016-10-24 2018-05-10 岡部株式会社 Pile head reinforcement member and pile head reinforcement structure
JP2020037780A (en) * 2018-09-03 2020-03-12 東電設計株式会社 Pile foundation

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101165445B1 (en) * 2009-12-28 2012-07-12 재단법인 포항산업과학연구원 Steel pipe pile and construciton method thereof
JP2016023538A (en) * 2014-07-24 2016-02-08 三谷セキサン株式会社 Connection structure between existing pile and structure on ground
CN104153384A (en) * 2014-08-22 2014-11-19 熊翱 On-sea sandwich steel pipe pile foundation and construction method
CN104612173A (en) * 2015-01-29 2015-05-13 福州大学 Novel jointless bridge structure comprising ultra-high performance concrete piles and construction method thereof
JP2018071056A (en) * 2016-10-24 2018-05-10 岡部株式会社 Pile head reinforcement structure
JP2018071055A (en) * 2016-10-24 2018-05-10 岡部株式会社 Pile head reinforcement member and pile head reinforcement structure
CN106836260A (en) * 2016-12-16 2017-06-13 兰州理工大学 A kind of crawler belt steel-pipe pile and construction method for reducing negative friction
JP2020037780A (en) * 2018-09-03 2020-03-12 東電設計株式会社 Pile foundation

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