JP2002061176A - Base isolation pile and its work execution method - Google Patents
Base isolation pile and its work execution methodInfo
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- JP2002061176A JP2002061176A JP2000250593A JP2000250593A JP2002061176A JP 2002061176 A JP2002061176 A JP 2002061176A JP 2000250593 A JP2000250593 A JP 2000250593A JP 2000250593 A JP2000250593 A JP 2000250593A JP 2002061176 A JP2002061176 A JP 2002061176A
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- Prior art keywords
- pile
- outer pipe
- seismic isolation
- steel pipe
- upper structure
- Prior art date
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Abstract
Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明は、回転貫入式鋼管杭
からなる免震杭とその施工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation pile composed of a rotary penetration steel pipe pile and a method for constructing the same.
【０００２】[0002]
【従来の技術】建物に用いられる杭は、建物の重量（鉛
直荷重）を支持すると共に、地震などの水平力にも耐え
る必要がある。地震時には杭頭に大きなせん断力や曲げ
モーメントが発生するため、杭は鉛直荷重と水平力に対
して十分耐えられるように設計されている。2. Description of the Related Art A pile used in a building must support the weight (vertical load) of the building and withstand horizontal forces such as earthquakes. The piles are designed to withstand vertical loads and horizontal forces, as large shear forces and bending moments occur at the pile head during an earthquake.
【０００３】しかし、発生した地震がきわめて大きいも
のであった場合には、杭頭に作用する力も過大なものと
なり、杭の破壊ひいては上部構造物の倒壊といった不測
の事態を招く恐れもある。そのような事情を考慮して、
地震などの水平力による杭の破壊、特に杭頭での破壊を
防止することを目的とした免震杭が提案されている。[0003] However, if the generated earthquake is extremely large, the force acting on the pile head becomes too large, which may cause an unexpected situation such as breakage of the pile and collapse of the upper structure. Considering such circumstances,
Seismic isolation piles have been proposed to prevent piles from breaking due to horizontal forces such as earthquakes, especially at the pile head.
【０００４】［従来技術１］ 特開平１１−１２４８６４（杭の免震構造） この免震構造では、構造物の重量を支持する杭と、水平
荷重負担用の水平抵抗部材を別々に設置する構造が示さ
れている。水平抵抗部材の配置は任意とされているが、
一つの方法として水平抵抗部材を管体で構成すると共
に、その管体の内部に杭が貫通するように当該管体を配
置することによって、杭と水平力抵抗部材の施工場所を
共通とし、施工コストの低減を図る方法が示されてい
る。その施工方法は、次の従来技術２と同様である。[Prior Art 1] JP-A-11-124864 (seismic isolation structure of pile) In this seismic isolation structure, a pile for supporting the weight of a structure and a horizontal resistance member for horizontal load bearing are separately installed. It is shown. Although the arrangement of the horizontal resistance member is optional,
As one method, the horizontal resistance member is formed of a pipe, and the pipe is disposed so that the pile penetrates inside the pipe, so that the pile and the horizontal force resistance member can be constructed in a common place, A method for reducing costs is shown. The construction method is the same as that of the following related art 2.
【０００５】［従来技術２］ 特開２０００−６４３０４（免震杭） 図１２に示すように、この免震杭２９は、上部構造物３
０の鉛直荷重を支持する内杭３１と、当該内杭３１の杭
頭周囲に設けられた外管杭３２と、内杭３１と外管杭３
２の隙間に充填されたゴム体３５と、外管杭３２と前記
内杭３１とをそれらの頂部において一体に連結する剛板
（連結部）３３からなり、前記外管杭３２は、前記上部
構造物からの水平力を周囲の地盤３４に伝達するように
なっていることを特徴としている。[Prior Art 2] Japanese Patent Laid-Open No. 2000-64304 (Seismic Isolation Pile) As shown in FIG.
0, an outer pile 32 provided around the pile head of the inner pile 31, an inner pile 31, and an outer pile 3
2, a rigid plate (connecting portion) 33 for integrally connecting the outer pipe pile 32 and the inner pile 31 at their tops, and the outer pipe pile 32 is provided in the upper part. It is characterized in that a horizontal force from a structure is transmitted to the surrounding ground 34.
【０００６】その施工方法については、公開公報の段落
［００２１］に次のように記されている。すなわち、
「…製作された免震杭を現場で施工するには、まず、地
盤３４に外管杭用埋設穴（図示せず）をその内径と深さ
がそれぞれ外管杭３２の外径と高さにほぼ一致するよう
に予め掘削形成する。[0006] The construction method is described as follows in paragraph [0021] of the publication. That is,
“… In order to construct the manufactured seismic isolation pile on-site, first, a buried hole (not shown) for the outer pipe pile is formed in the ground 34 by the inner diameter and the depth of the outer pipe pile 32, respectively. Is formed in advance so as to substantially match
【０００７】次に、現場に搬入された免震杭２９を吊持
して鉛直姿勢にて保持し、次いで、当該免震杭２９の内
杭３１の下端を外管杭用埋設穴の中央に位置合わせした
状態で剛板３３の上面を打ち込み面としてディーゼルハ
ンマー等で免震杭２９を地盤３４に打ち込むか、予め形
成された挿入孔に対して振動圧入する。このような打ち
込みあるいは圧入作業は、免震杭２９の外管杭３２が外
管杭用埋設穴にちょうど嵌まり込むまで行う…」とされ
ている。Next, the seismic isolation pile 29 carried into the site is suspended and held in a vertical posture, and then the lower end of the inner pile 31 of the seismic isolation pile 29 is placed at the center of the outer pipe pile burial hole. In the aligned state, the seismic isolation pile 29 is driven into the ground 34 using a hammer or the like with the upper surface of the rigid plate 33 as a driving surface, or is vibration-pressed into an insertion hole formed in advance. Such a driving or press-fitting operation is performed until the outer pipe pile 32 of the seismic isolation pile 29 just fits into the buried hole for the outer pipe pile ... ".
【０００８】[0008]
【発明が解決しようとする課題】しかし、前記の従来技
術１、２は、最も合理的な施工方法とはいえず、様々な
不都合が想定され、その場合の問題点を下に示す。However, the prior arts 1 and 2 cannot be said to be the most rational construction methods, and various inconveniences are assumed. Problems in such cases are shown below.
【０００９】まず、外管杭とほぼ同径の孔を掘削し、そ
の孔の中央に細い内杭を施工するため、内杭の周辺に深
い孔が空いた状態になっており、人や物がその孔に落下
してしまう危険性がある。また、あらかじめ孔を掘削す
るということは、残土を発生するということになる。近
年は、建設残土の処分場所が少なくなっており、処分費
用も高騰しているため、建設コストの上昇につながって
しまう。[0009] First, a hole having substantially the same diameter as the outer pipe pile is excavated, and a thin inner pile is constructed at the center of the hole, so that a deep hole is formed around the inner pile. May fall into the hole. In addition, excavating a hole in advance means generating residual soil. In recent years, the number of disposal sites for construction surplus soil has decreased, and disposal costs have also increased, leading to an increase in construction costs.
【００１０】また、前述のように、外管杭の外径および
高さにほぼ一致する孔を予め掘削し、その孔の中央に内
杭の先端を位置合わせする必要があるため、位置合わせ
用の特別な治具が必要となる。つまり、この場合、内杭
の先端位置が地表面であれば、地面に位置合わせ用の印
を付けておけばよいが、内杭の先端が孔になっているた
め、孔の底に印を付けても位置合わせをしながらでは、
人がその印を確認できないため、宙に浮いた状態で位置
合わせをできるような治具を別途使用する必要がある。Further, as described above, it is necessary to excavate a hole substantially corresponding to the outer diameter and height of the outer pipe pile, and to position the tip of the inner pile at the center of the hole. Special jig is required. In other words, in this case, if the tip of the inner pile is at the ground surface, it is sufficient to put a mark for alignment on the ground, but since the tip of the inner pile is a hole, mark the bottom of the hole. Even while attaching, while aligning,
Since a person cannot see the mark, it is necessary to use a jig that can be positioned while floating in the air.
【００１１】特開２０００−６４３０４の公開公報で
は、「…内杭の下端を外管杭用埋設穴の中央に位置合わ
せした状態で鋼板４の上面を打ち込み面として……」と
の記述になっている。一般に杭長が１５ｍ以下程度の場
合には、このような方法が可能であるが、杭長がそれ以
上に長くなると、杭を溶接等の方法で接合しながら施工
する必要がある。この場合には、最初は外管杭が取り付
けられていない内杭だけの鋼管を施工し、最終的に外管
杭が取り付けられた杭を接合することになる。The publication of Japanese Patent Application Laid-Open No. 2000-64304 describes that "... the upper surface of the steel plate 4 is used as a driving surface with the lower end of the inner pile aligned with the center of the buried hole for the outer pipe pile." ing. Generally, when the pile length is about 15 m or less, such a method is possible. However, when the pile length is longer than that, it is necessary to construct the pile while joining it by welding or the like. In this case, steel pipes of only the inner pile to which the outer pipe pile is not attached are first constructed, and finally, the pile to which the outer pipe pile is attached is joined.
【００１２】しかし、杭の接合時には杭の極近傍まで作
業者が立ち入る必要があり、内杭の周辺の孔には、人や
物が落下しないような安全措置を別途準備しなければな
らない。特に、近年建設工事の多い臨海部では支持層が
非常に深い位置にあり、杭長も５０ｍ程度になることが
多い。However, at the time of joining the piles, it is necessary for an operator to enter the pole very close to the piles, and safety measures must be separately provided in the holes around the inner piles so that people and objects do not fall. In particular, in the seaside area where many construction works have been performed in recent years, the support layer is located at a very deep position, and the pile length is often about 50 m.
【００１３】前記従来の免震杭の施工方法の問題点をま
とめると、次のようになる。 （１）杭施工前に外管杭用の孔を予め掘削しておく必要
があるため、作業手間がある上に残土を発生し、建設コ
ストの上昇につながる。 （２）外管杭用の孔を予め掘削しておくため、内杭との
間に隙間を生じ、人や物が落下する危険がある。 （３）その危険を回避するために別途安全対策が必要で
あり、手間とコストがかかる。 （４）杭の位置合わせにも専用の治具が必要となり、手
間とコストがかかる。The problems of the conventional seismic isolation pile construction method can be summarized as follows. (1) Since it is necessary to excavate holes for outer pipe piles before pile construction, there is a lot of work and waste soil is generated, leading to an increase in construction costs. (2) Since the hole for the outer pipe pile is excavated in advance, a gap is formed between the outer pile and the inner pile, and there is a risk that a person or an object may fall. (3) Separate safety measures are required to avoid the danger, which is troublesome and costly. (4) A dedicated jig is also required for positioning the piles, which requires labor and cost.
【００１４】そこで、本発明は、内杭と外杭に回転貫入
式鋼管杭を用いることによって、これらの問題を解決し
た免震杭および、その合理的な施工方法を提供すること
を目的とする。Accordingly, an object of the present invention is to provide a seismic isolation pile which solves these problems by using a rotary penetration steel pipe pile for the inner pile and the outer pile, and a rational construction method thereof. .
【００１５】[0015]
【課題を解決するための手段】前記の課題を解決するた
め、本発明の免震杭の施工方法は、次のように構成す
る。In order to solve the above-mentioned problems, a method for constructing a seismic isolation pile according to the present invention is configured as follows.
【００１６】第１の発明は、主として上部構造物の鉛直
荷重を支持する内杭と、当該内杭の杭頭部の周囲に貫入
され、主として当該上部構造物からの水平力に抵抗し、
あるいはさらにエネルギー吸収可能とした外管杭とから
なる免震杭を施工する施工方法であって、前記内杭と外
管杭は、それぞれの杭本体鋼管下端部に螺旋状の羽根が
固着された羽根付き回転貫入式鋼管杭であり、内外両杭
の施工に当たって、まず前記内杭を回転駆動して地盤中
に貫入施工し、ついで前記外管杭を内杭の杭頭部にかぶ
せるようにして貫入施工することを特徴とする。According to a first aspect of the present invention, there is provided an inner pile mainly supporting a vertical load of an upper structure, and penetrating around a pile head of the inner pile, mainly resisting a horizontal force from the upper structure,
Alternatively, it is a construction method of constructing a seismic isolation pile composed of an outer pipe pile capable of further absorbing energy, wherein the inner pile and the outer pipe pile have a spiral blade fixed to a lower end of each pile body steel pipe. It is a rotary penetration type steel pipe pile with blades, and in the construction of both inner and outer piles, first, the inner pile is rotated and driven to penetrate into the ground, and then the outer pipe pile is put on the pile head of the inner pile. It is characterized by intrusive construction.
【００１７】第２の発明は、主として上部構造物の鉛直
荷重を支持する内杭と、当該内杭の杭頭部の周囲に貫入
され、主として当該上部構造物からの水平力に抵抗し、
あるいはさらにエネルギー吸収可能とした外管杭とが予
め連結されてなる免震杭であって、前記内杭の杭本体鋼
管下端部に螺旋状の羽根が固着され、回転駆動されて地
盤中に貫入施工される羽根付き回転貫入式鋼管杭であ
り、また、前記外管杭の杭本体鋼管下端部に螺旋状の補
助羽根が固着されてなることを特徴とする。According to a second aspect of the present invention, there is provided an inner pile mainly supporting a vertical load of an upper structure, and penetrating around a pile head of the inner pile, mainly resisting a horizontal force from the upper structure,
Alternatively, a seismic isolation pile in which an outer pipe pile capable of absorbing energy is connected in advance, and a spiral blade is fixed to the lower end of the pile main body steel pipe of the inner pile, and is driven to rotate to penetrate into the ground. This is a rotary penetrating steel pipe pile with blades to be constructed, and a spiral auxiliary blade is fixed to the lower end of the pile body steel pipe of the outer pipe pile.
【００１８】第３の発明は、主として上部構造物の鉛直
荷重を支持する内杭と、当該内杭の杭頭部の周囲に貫入
され、主として当該上部構造物からの水平力に抵抗し、
あるいはさらにエネルギー吸収可能とした外管杭とが予
め連結されてなる免震杭であって、前記内杭の杭本体鋼
管下端に螺旋状の羽根が固着され回転駆動されて地盤中
に貫入施工される羽根付き回転貫入式鋼管杭であり、中
空の円錐台状に形成され大径側の上端が前記外管杭の下
端に接合されると共に、小径側の下端が前記内杭の杭本
体鋼管の外周に接合されたテーパー部材が設けられてな
ることを特徴とする。According to a third aspect of the present invention, there is provided an inner pile mainly supporting a vertical load of an upper structure, and penetrating around a pile head of the inner pile, mainly resisting a horizontal force from the upper structure,
Alternatively, it is a seismic isolation pile in which an outer pipe pile capable of absorbing energy is connected in advance, and a spiral blade is fixed to the lower end of the pile body steel pipe of the inner pile and driven to rotate to penetrate the ground. A rotary penetrating steel pipe pile with blades, the upper end of which is formed in a hollow frustoconical shape, the upper end of the large diameter side is joined to the lower end of the outer pipe pile, and the lower end of the small diameter side is the pile main body steel pipe of the inner pile. A tapered member joined to the outer periphery is provided.
【００１９】また、第４の発明は、第３の発明における
テーパー部材のテーパ部に螺旋状の補助羽根が設けられ
てなることを特徴とする。A fourth invention is characterized in that a spiral auxiliary blade is provided in the tapered portion of the tapered member according to the third invention.
【００２０】また、第５の発明の免震杭は、主として上
部構造物の鉛直荷重を支持する内杭と、当該内杭の杭頭
部の周囲に貫入され、主として当該上部構造物からの水
平力に抵抗し、あるいはさらにエネルギー吸収可能とし
た外管杭とが予め連結されてなる免震杭であって、前記
内杭の杭本体鋼管下端部に螺旋状の羽根が固着され回転
駆動されて地盤中に貫入施工される羽根付き回転貫入式
鋼管杭であり、中空の円錐台状に形成され大径側の上端
が前記外管杭の下端に僅かな隙間をもって対向配置され
ると共に、小径側の下端が前記内杭の杭本体鋼管の外周
に接合されたテーパー部材が設けられ、前記テーパー部
材の下端接合部に螺旋状の補助羽根が固着されてなるこ
とを特徴とする。The seismic isolation pile according to the fifth aspect of the present invention is an inner pile mainly supporting a vertical load of the upper structure, and penetrates around a pile head of the inner pile, and mainly extends horizontally from the upper structure. A seismic isolation pile in which an outer pipe pile capable of resisting force or capable of further absorbing energy is connected in advance, and a spiral blade is fixed to the lower end of the pile main body steel pipe of the inner pile and is driven to rotate. This is a rotary penetrating steel pipe pile with blades penetrating into the ground, formed in a hollow truncated cone shape, and the upper end of the large diameter side is arranged opposite to the lower end of the outer pipe pile with a small gap, and the small diameter side A tapered member having a lower end joined to the outer periphery of the pile body steel pipe of the inner pile is provided, and a spiral auxiliary blade is fixed to a lower end joint of the tapered member.
【００２１】第６の発明は、第２〜５の発明の免震杭で
あって、前記内杭と外管杭との間の空間に弾性材が充填
されてなることを特徴とする。According to a sixth aspect of the present invention, there is provided the seismic isolation pile according to any of the second to fifth aspects, wherein a space between the inner pile and the outer pipe pile is filled with an elastic material.
【００２２】[0022]
【作用】本発明によれば、免震杭が羽根付き回転貫入杭
であるので、杭の施工前に挿入用の穴を掘削する必要が
ないため、内杭と外管杭用の穴との間に隙間が生じるよ
うなことがないので、人や物がその隙間に落下する危険
がなくなり、落下防止のための安全対策も不要となる。According to the present invention, since the seismic isolation pile is a rotary penetrating pile with blades, there is no need to drill an insertion hole before the pile is constructed. Since there is no gap between them, there is no danger of a person or an object falling into the gap, and no safety measures are required to prevent the fall.
【００２３】また、内杭施工時に、外管杭の外径および
高さにほぼ一致する孔を予め掘削しておく必要がないた
め、内杭の位置合わせは、地表面で実行できるようにな
り、作業が容易で、特別な治具も必要でない。外杭につ
いても先に施工された内杭の外側に回転貫入すればよい
ので、作業性に何ら問題を生じない。In addition, when the inner pile is constructed, it is not necessary to excavate a hole substantially corresponding to the outer diameter and the height of the outer pipe pile, so that the inner pile can be positioned on the ground surface. The work is easy and no special jig is required. As for the outer pile, it is only necessary to rotate and penetrate outside the inner pile previously constructed, so that there is no problem in workability.
【００２４】また、内杭と外管杭とが一体化された免震
杭にあっては、内杭と外管杭とを別々に施工しないで、
同時に回転貫入工法で施工することになるので、施工現
場での両杭の位置合わせは不要で、施工に手間がかから
ず、作業性は一層向上する。In the case of a seismic isolation pile in which the inner pile and the outer pipe pile are integrated, the inner pile and the outer pipe pile are not separately constructed.
At the same time, since the construction is performed by the rotary penetration method, there is no need to position the two piles at the construction site, so that the construction is not troublesome and the workability is further improved.
【００２５】[0025]
【発明の実施の形態】［第１実施形態］本発明の第１実
施形態を図１〜図３を参照して説明する。図１は本実施
形態の免震杭の適用例を示す側面図、図２は免震杭の斜
視図、図３は断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] A first embodiment of the present invention will be described with reference to FIGS. 1 is a side view showing an application example of the seismic isolation pile of the present embodiment, FIG. 2 is a perspective view of the seismic isolation pile, and FIG. 3 is a sectional view.
【００２６】図１に示すように、例えば４階建ての事務
所ビルのような上部構造物１を支持する免震杭２は、例
えば、深さＨが３０ｍの軟弱地盤３のさらにその下にあ
る支持層４に到達して貫入されて上部構造物１の鉛直荷
重を支持する鋼管製内杭５と、その杭頭部５ａの周囲に
貫入されて上部構造物１の水平力を周囲の地盤３に伝達
する外管杭６とからなっている。As shown in FIG. 1, for example, a seismic isolation pile 2 supporting an upper structure 1 such as a four-story office building is provided under a soft ground 3 having a depth H of 30 m, for example. An inner pile 5 made of steel pipe, which reaches and penetrates a certain support layer 4 and supports the vertical load of the upper structure 1, and a horizontal force of the upper structure 1 which penetrates around the pile head 5a to reduce the horizontal force of the surrounding ground. 3 and an outer pipe pile 6 for transmitting to the outer pipe 3.
【００２７】図２、図３（ａ）に示すように、前記内杭
５の杭本体鋼管５ｂの下端は略一巻きの螺旋状に形成さ
れ、その螺旋形状に対応した形状で略一巻きの螺旋状の
羽根５ｃが、その下端に固着されている。羽根５ｃは内
杭５の内外径から内外へそれぞれ所定量延出して、杭本
体鋼管５ｂの下端部には若干の開口５ｄが形成されてい
る。こうして、内杭５は開端の羽根付き回転貫入式鋼管
杭に形成されている。ただし、内杭５の先端部形状は、
実施形態の形状に限るものではなく、これまでに提案さ
れている回転貫入形式の杭の何れの形状でもよい。As shown in FIGS. 2 and 3 (a), the lower end of the pile main body steel pipe 5b of the inner pile 5 is formed in a substantially spiral shape, and the shape corresponding to the spiral shape is substantially one spiral. A spiral blade 5c is fixed to the lower end. The blades 5c extend a predetermined amount from the inner and outer diameters of the inner pile 5 inward and outward, respectively, and a slight opening 5d is formed at the lower end of the pile main body steel pipe 5b. Thus, the inner pile 5 is formed as a rotating penetrating steel pipe pile with blades at the open end. However, the tip shape of the inner pile 5 is
The shape of the pile is not limited to the shape of the embodiment, and may be any shape of a rotary penetration type pile proposed so far.
【００２８】また、前記外管杭６の杭本体鋼管６ｂは、
内杭５の杭本体鋼管５ｂよりも大径で、杭長Ｌが例えば
５ｍに形成され、その杭本体鋼管６ｂの下端には内杭５
と同様に一巻きの螺旋状の羽根（以下外管杭に設けられ
る羽根を補助羽根という）６ｃが固着されている。補助
羽根６ｃの内縁は、内杭５の杭本体鋼管５ｂの外形より
も若干大径に形成されて隙間７が生じている（図３
ａ）。なお、この隙間７の大きさは必要に応じて決め
る。The pile body steel pipe 6b of the outer pipe pile 6 is
The inner pile 5 has a diameter larger than that of the pile body steel pipe 5b and a pile length L of, for example, 5 m.
Similarly, a spiral spiral blade (hereinafter, a blade provided on the outer tube pile is referred to as an auxiliary blade) 6c is fixed. The inner edge of the auxiliary blade 6c is formed slightly larger in diameter than the outer shape of the pile main body steel pipe 5b of the inner pile 5, and a gap 7 is generated.
a). Note that the size of the gap 7 is determined as needed.
【００２９】すなわち、内杭５と外管杭６との隙間スペ
ース８に土を入れたくない場合は、隙間７をできるだけ
小さく設定し、さらに補助羽根６ｃの段差部の隙間を閉
じ板で塞ぐ。また、土が入っても構わない場合は、隙間
７を大きく設定すると施工性が良くなる。さらに、隙間
７を大きく設定し、進入した土を後で除去しても構わな
い。また、外管杭６の鋼管外周に補助羽根を固着しても
構わない。In other words, when it is not desired to put soil in the gap space 8 between the inner pile 5 and the outer pipe pile 6, the gap 7 is set as small as possible, and the gap at the step portion of the auxiliary blade 6c is closed with a closing plate. In addition, when it is acceptable for the soil to enter, setting the gap 7 to be large improves workability. Further, the gap 7 may be set large, and the soil that has entered may be removed later. Further, auxiliary blades may be fixed to the outer periphery of the steel pipe of the outer pipe pile 6.
【００３０】図３（ｂ）は、同図（ａ）の変形例を示
す。この例では、外管杭６の下端がフラットに切断され
ていて、その下端部の内周縁に環状の閉塞板１３を固着
して、かつ、閉塞板１３と内杭５との間に隙間７を形成
する。また、外管杭６の外周面には、外管杭６の下端縁
を螺旋の始端とする補助羽根６ｃ−１が設けられてい
る。FIG. 3B shows a modification of FIG. 3A. In this example, the lower end of the outer pipe pile 6 is cut flat, an annular closing plate 13 is fixed to the inner peripheral edge of the lower end, and a gap 7 is provided between the closing plate 13 and the inner pile 5. To form Further, on the outer peripheral surface of the outer pipe pile 6, an auxiliary blade 6c-1 having a lower end edge of the outer pipe pile 6 as a start end of a spiral is provided.
【００３１】免震杭２の施工に当たっては、まず内杭５
を回転駆動して支持層４に達するように貫入する。つい
で外管杭６を内杭５と同心状態に配置して、内杭５と同
様に回転駆動して貫入する。このとき、外管杭６と内杭
５は共に羽根付き鋼管杭であるから、例えば前記従来例
のように、外管杭挿入用の孔（この孔には、人が落下す
る危険性がある）を外管杭の杭長に合わせて予め掘削し
ておき、その後、その孔の中央に位置合わせして、場合
によっては、予め掘削してある内杭挿入用の孔に内杭を
挿入するような手順を踏む必要はない。When constructing the seismic isolation pile 2, first, the inner pile 5
Is driven to rotate and penetrates to reach the support layer 4. Then, the outer pipe pile 6 is arranged concentrically with the inner pile 5, and is driven to rotate and penetrate similarly to the inner pile 5. At this time, since the outer pipe pile 6 and the inner pile 5 are both steel pipe piles with blades, for example, a hole for inserting the outer pipe pile (in this hole, there is a ) Is excavated in advance according to the pile length of the outer pipe pile, and then aligned with the center of the hole, and in some cases, the inner pile is inserted into the previously excavated hole for inserting the inner pile. There is no need to take such steps.
【００３２】また、本施工における内杭５の貫入時に
は、外管杭６の外径および高さにほぼ一致する孔を予め
掘削しておく必要がないため、当該内杭５の位置合わせ
は地表面で実行できるようになり、作業が容易で特別な
治具も必要でない。外管杭６の貫入に当たっては、先に
貫入施工した内杭５の杭頭を例えば地表に露出させるこ
とにより、当該外管杭６の位置合わせも容易であり、こ
の場合も治具が不要で、手間もかからない。Further, when the inner pile 5 penetrates in the present construction, it is not necessary to excavate a hole substantially corresponding to the outer diameter and height of the outer pipe pile 6 in advance. It can be performed on the surface, is easy to work and does not require special jigs. When the outer pipe pile 6 is penetrated, the outer pipe pile 6 can be easily positioned by exposing the pile head of the inner pile 5 previously penetrated to, for example, the ground surface. In this case, no jig is required. , No hassle.
【００３３】もしも、内杭５の杭頭部５ａが地表面より
も下のレベルにある場合は、内杭５の施工にヤットコ
（図示省略）を用いる。そして、そのヤットコをすぐに
撤去せずに、外管杭６の施工を行えば、ヤットコを目印
として外管杭６の施工を実施できる。また外管杭６の施
工にも外管杭６用のヤットコを使用する。そして、外管
杭６の施工終了後にそれぞれのヤットコを撤去する。If the pile head 5a of the inner pile 5 is at a level lower than the ground surface, a Yatco (not shown) is used for the construction of the inner pile 5. If the outer pipe pile 6 is constructed without immediately removing the yatco, the outer pipe pile 6 can be constructed with the yatco as a mark. In addition, the outer pipe pile 6 is also constructed using a yoke for the outer pipe pile 6. Then, after the construction of the outer pipe pile 6 is completed, each yacht is removed.
【００３４】内外両杭５，６の貫入後、それらの間の隙
間スペース８をそのままにするか、あるいはその隙間ス
ペース８にコンクリートを充填すると共に、両杭５，６
の杭頭部５ａ，６ａを上部構造物１の下部１ａに固着す
る。なお固着する場合には、杭頭に定着用の鉄筋や鉄骨
を溶接等の方法で固定し、しかる後に上部構造物の下部
１ａを施工すればよい。あるいは杭頭を下部１ａに埋め
込んでもよい（図１）。After the inner and outer piles 5 and 6 have penetrated, the gap space 8 between them is either left as it is, or the gap space 8 is filled with concrete, and the piles 5 and 6 are filled.
Is fixed to the lower part 1a of the upper structure 1. In the case of fixing, a reinforcing steel or a steel frame for fixing is fixed to the pile head by welding or the like, and then the lower part 1a of the upper structure may be constructed. Alternatively, the pile head may be embedded in the lower part 1a (FIG. 1).
【００３５】［第２実施形態］本発明の第２実施形態を
図４、図５を参照して説明する。図４は本実施形態の免
震杭の側面図であり、図５は断面図である。[Second Embodiment] A second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a side view of the seismic isolation pile of the present embodiment, and FIG. 5 is a sectional view.
【００３６】図４、図５（ａ）に示すように、免震杭９
を構成する内杭１０と外管杭１１とは、それらの杭頭部
１０ａ，１１ａが厚鋼板１２により一体に結合されてい
る。この点が第１実施形態の構成（図１〜図３）との相
違点であり、その他の構成は同じである。したがって、
同等要素には対応符号を付して重複説明を省略する。As shown in FIG. 4 and FIG.
The pile heads 10a and 11a of the inner pile 10 and the outer pipe pile 11 are integrally connected by a thick steel plate 12. This is a difference from the configuration of the first embodiment (FIGS. 1 to 3), and the other configurations are the same. Therefore,
Equivalent elements are denoted by corresponding reference numerals, and redundant description is omitted.
【００３７】内外両杭１０，１１の杭頭部１０ａ，１１
ａが結合された状態で、外管杭１１下端に固着された羽
根１１ｃの螺旋は、内杭１０下端に固着された羽根１０
ｃと同ピッチで、かつ羽根１０ｃの螺旋のほぼ延長上に
あるように配置されている。したがって、外管杭１１の
羽根は補助羽根１１ｃとなっており、外管杭１１の貫入
に必要となる推進力を発揮する。また、補助羽根１１ｃ
の内縁は内杭１０の杭本体鋼管１０ｂの外周との間に隙
間１３を有している。なお、杭が長い場合には、現場溶
接によって杭を接合しながら施工を行う。例えば３本の
鋼管を接続する場合には、一番下を下杭、中央を中杭、
上部を上杭と呼ぶ。図中１０ｄは杭間の溶接接合部を示
す。The pile heads 10a, 11 of the inner and outer piles 10, 11
a, the spiral of the blade 11 c fixed to the lower end of the outer pipe pile 11 is rotated by the blade 10 c fixed to the lower end of the inner pile 10.
The blades 10c are arranged at the same pitch as that of the blade c and substantially on the extension of the spiral of the blade 10c. Therefore, the blades of the outer pipe pile 11 are the auxiliary blades 11c, and exert the propulsion necessary for the penetration of the outer pipe pile 11. In addition, the auxiliary blade 11c
Has a gap 13 between the inner pile 10 and the outer periphery of the pile body steel pipe 10b. When piles are long, construction is performed while joining piles by field welding. For example, when connecting three steel pipes, the bottom is the lower pile, the center is the middle pile,
The upper part is called the upper pile. In the drawing, 10d indicates a welded joint between the piles.
【００３８】図５（ｂ）は、同図（ａ）の変形例を示
す。この例では、内杭１０の上端に開孔部１２ｂが形成
されていて、それらの杭頭部１０ａ，１１ａが円環状の
厚鋼板１２ａにより一体に結合されている。FIG. 5B shows a modification of FIG. 5A. In this example, an opening 12b is formed at the upper end of the inner pile 10, and the pile heads 10a and 11a are integrally connected by an annular thick steel plate 12a.
【００３９】免震杭９の貫入に当たっては、その杭頭を
施工機に固着して、杭頭に回転力を作用させるか、また
は下杭、中杭の施工時には、内杭１０の外周を把持し、
上杭の施工時には外管杭１１の外周を把持して回転力を
作用させるかの何れかの方法をとる。When penetrating the seismic isolation pile 9, the pile head is fixed to a construction machine and a rotational force is applied to the pile head, or the outer periphery of the inner pile 10 is gripped when lower piles and middle piles are constructed. And
At the time of construction of the upper pile, any method of gripping the outer periphery of the outer pipe pile 11 and applying a rotational force is employed.
【００４０】内外両杭１０，１１が予め固着されている
ため、内杭１０と外管杭１１とを別々に施工しないで、
同時に回転貫入工法で施工するので、施工現場での両杭
１０，１１の位置合わせは不要で、施工に手間がかから
ず、作業性は一層向上する。Since the inner and outer piles 10 and 11 are fixed in advance, the inner pile 10 and the outer pipe pile 11 are not separately constructed.
At the same time, since the construction is carried out by the rotary intrusion method, it is not necessary to align the two piles 10 and 11 at the construction site, so that the construction is not troublesome and the workability is further improved.
【００４１】内杭１０の径と板厚は、上部構造物１から
の鉛直荷重によって定める。地震時の水平力を外管杭１
１で負担するためには、外管杭１１の剛性を大きくする
必要がある（水平力は、内杭１０と外管杭１１にそれぞ
れの剛性比に分配される）。外管杭１１の径と板厚は、
必要とされる剛性および作用する水平力によって定め
る。また、エネルギー吸収性能を向上させるために外管
杭１１に低降伏点鋼を用いてもよい。The diameter and thickness of the inner pile 10 are determined by the vertical load from the upper structure 1. Outer pipe pile 1 for horizontal force during earthquake
It is necessary to increase the rigidity of the outer pipe pile 11 in order to bear the burden of 1 (horizontal force is distributed to the inner pile 10 and the outer pipe pile 11 at respective rigidity ratios). The diameter and thickness of the outer pipe pile 11
It depends on the required rigidity and the acting horizontal force. In addition, a low yield point steel may be used for the outer pipe pile 11 to improve the energy absorption performance.
【００４２】［第３実施形態］本発明の第３実施形態
を、図６、図７を参照して説明する。図６は本実施形態
の免震杭の側面図であり、図７は断面図である。[Third Embodiment] A third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a side view of the seismic isolation pile of the present embodiment, and FIG. 7 is a sectional view.
【００４３】図６、図７に示すように、この免震杭１４
は、その内杭１５と外管杭１６とが互いの杭頭部１５
ａ，１６ａにて厚鋼板１７により一体に結合されると共
に、外管杭１６下端の補助羽根１６ｃの内縁が内杭１５
の外周に接合されている。この外管杭１６は、エネルギ
ー吸収性能を向上させるために低降伏点鋼を用いてもよ
い。As shown in FIG. 6 and FIG.
Means that the inner pile 15 and the outer pipe pile 16 are
a, 16a are integrally joined by a thick steel plate 17, and the inner edge of the auxiliary blade 16c at the lower end of the outer pipe pile 16 is
Is joined to the outer periphery of The outer pipe pile 16 may use low yield point steel in order to improve the energy absorption performance.
【００４４】そして、内杭１５と外管杭１６との隙間ス
ペース１８には予めゴム材１９（弾性材）を充填しても
よい。The space 18 between the inner pile 15 and the outer pipe pile 16 may be filled with a rubber material 19 (elastic material) in advance.
【００４５】［第４実施形態］本発明の第４実施形態を
図８、図９を参照して説明する。図８は本実施形態の免
震杭の側面図であり、図９はその断面図である。[Fourth Embodiment] A fourth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a side view of the seismic isolation pile of the present embodiment, and FIG. 9 is a sectional view thereof.
【００４６】図８、図９に示すように、この免震杭２０
では、内杭２１の杭本体鋼管２１ｂに下端を接合され
て、上方に向かって拡径するテーパー部材２３が設けら
れ、そのテーパー部材２３の大径側の上端が、外管杭２
２の下端との間に隙間２４を有して対向している。この
隙間２４を設けることにより、外管杭２２は軸力を負担
てきないので、外管杭２２には軸力が入力しない。As shown in FIG. 8 and FIG.
In this example, a tapered member 23 whose lower end is joined to the pile main body steel pipe 21b of the inner pile 21 and whose diameter increases upward is provided, and the upper end of the tapered member 23 on the large diameter side is the outer pipe pile 2.
2 with a gap 24 between them. By providing the gap 24, the outer pipe pile 22 does not bear the axial force, so that no axial force is input to the outer pipe pile 22.
【００４７】そして、内杭２１の杭本体鋼管２１ｂとの
接合部近傍に補助羽根２２ｃが設けられている。この点
が前記第２実施形態と異なり、内杭２１の下端に羽根２
１ｃが設けられること、その他は第２実施形態と同様の
構成である。An auxiliary blade 22c is provided in the vicinity of the joint between the inner pile 21 and the pile body steel pipe 21b. This point differs from the second embodiment in that the blades 2
1c is provided, and the other configuration is the same as that of the second embodiment.
【００４８】このような構成により、免震杭２０の貫入
に当たっては、第２実施形態と同様の施工方法が採られ
る。With such a configuration, when penetrating the seismic isolation pile 20, a construction method similar to that of the second embodiment is employed.
【００４９】［第５実施形態］本発明の第５実施形態を
図１０、図１１を参照して説明する。図１０は本実施形
態の免震杭の側面図であり、図１１はその断面図であ
る。[Fifth Embodiment] A fifth embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a side view of the seismic isolation pile of the present embodiment, and FIG. 11 is a sectional view thereof.
【００５０】図１０、図１１に示すように、この免震杭
２５は、第４実施形態の補助羽根２２ｃを備えていない
点および、テーパー部材２６の上端が外管杭２８の下端
に接合されている点が第４実施形態と相違し、内杭２７
の下端に羽根２７ｃが設けられること、その他の構成は
第４実施形態と同じである。As shown in FIGS. 10 and 11, the seismic isolation pile 25 does not include the auxiliary blade 22c of the fourth embodiment, and the upper end of the tapered member 26 is joined to the lower end of the outer pipe pile 28. Is different from the fourth embodiment in that the inner pile 27
The other configuration is the same as that of the fourth embodiment in that a blade 27c is provided at the lower end of the blade.
【００５１】外管杭２８を配置する深さ範囲の地盤３
（図１）は軟弱であることが多いので、その地盤条件に
よっては補助羽根が不要の場合もある。補助羽根の必要
性の有無は、地盤条件、内杭２７と外管杭２８の径の
差、杭径などの条件の組み合わせによって決まり、例え
ばＮ値が５程度以下であれば補助羽根は不要であること
も多い。The ground 3 in the depth range where the outer pipe pile 28 is to be arranged
Since FIG. 1 is often soft, the auxiliary blades may not be required depending on the ground conditions. The necessity of the auxiliary blade is determined by a combination of ground conditions, a difference between the diameter of the inner pile 27 and the outer pipe pile 28, and a diameter of the pile. For example, if the N value is about 5 or less, the auxiliary blade is unnecessary. There are many.
【００５２】このような構成により、この免震杭２５の
貫入に当たっては、第２実施形態と同様の施工方法が採
られる。With such a configuration, when penetrating the seismic isolation pile 25, the same construction method as in the second embodiment is adopted.
【００５３】第１〜第５実施形態において、内杭２、９
…の杭本体鋼管の下端は、一巻きの螺旋状に形成され、
その螺旋形状に対応した形状で一巻きの螺旋状の羽根５
ｃ、６ｃ…が固着された例を示したが、螺旋状の羽根の
内杭に対する固着態様は、図示例に限定されず、内杭
２、９…の下端部外周に固着してもよい。したがって、
請求の範囲に記載する内杭の下端部に螺旋状の羽根を固
着するとは、このように広い意味で使用するもので、例
えば閉端杭等でもよい。In the first to fifth embodiments, the inner piles 2, 9
The lower end of the pile body steel pipe of ... is formed in a spiral of one turn,
One spiral spiral blade 5 having a shape corresponding to the spiral shape
Although the example in which c, 6c,... are fixed is shown, the manner in which the spiral blade is fixed to the inner pile is not limited to the illustrated example, and may be fixed to the outer periphery of the lower ends of the inner piles 2, 9,. Therefore,
Affixing the spiral blade to the lower end of the inner pile described in the claims is used in such a broad sense, and may be, for example, a closed end pile.
【００５４】第１〜第３実施形態において、外管杭６、
１１…についても同様で、当該外管杭６、１１…の杭本
体鋼管の下端を、一巻きの螺旋状に形成し、その螺旋形
状に対応した形状で一巻きの螺旋状の羽根５ｃ、６ｃ…
が固着された例を示したが、螺旋状の羽根の外管杭６、
１１…に対する固着態様は、図示例に限定されず、外管
杭の下端部外周に固着してもよい。したがって、請求の
範囲に記載する外管杭の下端部に螺旋状の羽根を固着す
るとは、このように広い意味で使用するものである。In the first to third embodiments, the outer pipe pile 6,
Similarly, the lower ends of the pile body steel pipes of the outer pipe piles 6, 11,... Are formed in a spiral shape, and the spiral blades 5c, 6c in a shape corresponding to the spiral shape are formed. …
Is shown, but the outer pipe pile 6 of the spiral blades,
The manner of fixing to 11 is not limited to the illustrated example, and may be fixed to the outer periphery of the lower end of the outer pipe pile. Therefore, fixing the spiral blade to the lower end of the outer pipe pile described in the claims is used in such a broad sense.
【００５５】[0055]
【発明の効果】以上の説明から明らかなように、本発明
によれば、免震杭が羽根付き回転貫入杭であるので、免
震杭の施工前に杭挿入用の穴を掘削する必要がなく、し
たがって従来例と異なり、内杭用と外管杭用の各穴間に
隙間が生じるようなことがないので、人や物がその隙間
に落下する危険がなくなり、安全対策も不要となる。As is apparent from the above description, according to the present invention, since the seismic isolation pile is a rotary penetrating pile with blades, it is necessary to drill a hole for inserting the pile before constructing the seismic isolation pile. Therefore, unlike the conventional example, there is no gap between the holes for the inner pile and the outer pipe pile, so there is no danger of people or objects falling into the gap, and no safety measures are required. .
【００５６】また、内杭の施工時に外管杭の外径および
高さにほぼ一致する孔を予め掘削しておく必要がないた
め、当該内杭の位置合わせは地表面で実行できるように
なり、作業が容易で、特別な治具も必要でない。さら
に、先に貫入施工した内杭の杭頭を例えば地表に露出さ
せることにより、外管杭の位置合わせも容易であり、こ
の場合も治具が不要で、手間もかからない。Since there is no need to previously drill a hole substantially corresponding to the outer diameter and the height of the outer pipe pile at the time of constructing the inner pile, the positioning of the inner pile can be performed on the ground surface. The work is easy and no special jig is required. Furthermore, by exposing the pile head of the inner pile previously penetrated to the surface of the ground, for example, it is easy to position the outer pipe pile. In this case, too, no jig is required, and no labor is required.
【００５７】また、内杭と外管杭とが一体化された免震
杭にあっては、内杭と外管杭とを別々に施工しないで、
同時に回転貫入工法で施工するので、施工現場での両杭
の位置合わせは不要で、施工に手間がかからず、作業性
は一層向上する。In the case of a seismic isolation pile in which the inner pile and the outer pipe pile are integrated, the inner pile and the outer pipe pile are not separately constructed.
At the same time, since the construction is performed by the rotary penetration method, there is no need to position the two piles at the construction site, so that the construction is not troublesome and the workability is further improved.
【図１】本発明の第１実施形態における免震杭の適用例
を示す側面図である。FIG. 1 is a side view showing an application example of a seismic isolation pile according to a first embodiment of the present invention.
【図２】第１実施形態の免震杭の斜視図である。FIG. 2 is a perspective view of the seismic isolation pile according to the first embodiment.
【図３】（ａ）は第１実施形態の免震杭の断面図、
（ｂ）はその変形例の断面図である。FIG. 3A is a sectional view of a seismic isolation pile according to the first embodiment,
(B) is sectional drawing of the modification.
【図４】本発明の第２実施形態における免震杭の側面図
である。FIG. 4 is a side view of a seismic isolation pile according to a second embodiment of the present invention.
【図５】（ａ）は第２実施形態の免震杭の断面図、
（ｂ）はその変形例の断面図である。FIG. 5A is a sectional view of a seismic isolation pile according to a second embodiment,
(B) is sectional drawing of the modification.
【図６】本発明の第３施形態における免震杭の側面図で
ある。FIG. 6 is a side view of a seismic isolation pile according to a third embodiment of the present invention.
【図７】第３施形態の免震杭の断面図である。FIG. 7 is a sectional view of a seismic isolation pile according to a third embodiment.
【図８】本発明の第４実施形態における免震杭の側面図
である。FIG. 8 is a side view of a seismic isolation pile according to a fourth embodiment of the present invention.
【図９】第４実施形態の免震杭の断面図である。FIG. 9 is a sectional view of a seismic isolation pile according to a fourth embodiment.
【図１０】本発明の第５実施形態における免震杭の側面
図である。FIG. 10 is a side view of a seismic isolation pile according to a fifth embodiment of the present invention.
【図１１】第５実施形態の免震杭の断面図である。FIG. 11 is a sectional view of a seismic isolation pile according to a fifth embodiment.
【図１２】（ａ）は従来例の免震杭の使用例の全体断面
図、（ｂ）は同（ａ）のイ−イ断面図である。12A is an overall sectional view of an example of using a conventional seismic isolation pile, and FIG. 12B is an II sectional view of FIG. 12A.
１ 上部構造物 ２，９，１４，２０，２５ 免震杭 ３ 軟弱地盤 ４ 支持層 ５，９，１０，１５，２１，２７ 内杭 ５ａ，６ａ，１０ａ，１１ａ，１５ａ，１６ａ 杭頭部 ５b，６b 杭本体鋼管 ５ｃ，１０ｃ，１５ｃ，２１ｃ，２７ｃ 羽根 ６ｃ，６ｃ−１，１１ｃ，１６ｃ，２２ｃ 補助羽根 ６，１１，１６，２２，２８ 外管杭 ７ 隙間 ８，１８ 隙間スペース １０ｄ 溶接接合部 １２，１２ａ，１７ 厚鋼板 １２ｂ 開孔部 １３ 閉塞板 １９ ゴム材（弾性材） ２３，２６ テーパー部材 ２９ 免震杭 ３０ 上部構造物 ３１ 内杭 ３２ 外管杭 ３３ 剛板（連結部） ３４ 地盤 ３５ ゴム体 DESCRIPTION OF SYMBOLS 1 Upper structure 2, 9, 14, 20, 25 Seismic isolation pile 3 Soft ground 4 Support layer 5, 9, 10, 15, 21, 27 Inner pile 5a, 6a, 10a, 11a, 15a, 16a Pile head 5b , 6b Pile body steel pipe 5c, 10c, 15c, 21c, 27c Blade 6c, 6c-1, 11c, 16c, 22c Auxiliary blade 6,11,16,22,28 Outer pipe pile 7 Gap 8,18 Gap space 10d Welding Part 12, 12a, 17 Thick steel plate 12b Opening part 13 Closure plate 19 Rubber material (elastic material) 23, 26 Tapered member 29 Seismic isolation pile 30 Upper structure 31 Inner pile 32 Outer pipe pile 33 Rigid plate (connection part) 34 Ground 35 Rubber body
Claims (6)
る内杭と、当該内杭の杭頭部の周囲に貫入され、主とし
て当該上部構造物からの水平力に抵抗し、あるいはさら
にエネルギー吸収可能とした外管杭とからなる免震杭を
施工する施工方法であって、前記内杭と外管杭は、それ
ぞれの杭本体鋼管下端部に螺旋状の羽根が固着された羽
根付き回転貫入式鋼管杭であり、内外両杭の施工に当た
って、まず前記内杭を回転駆動して地盤中に貫入施工
し、ついで前記外管杭を内杭の杭頭部にかぶせるように
して貫入施工することを特徴とする免震杭の施工方法。1. An inner pile mainly supporting a vertical load of an upper structure, and penetrated around a pile head of the inner pile, mainly capable of resisting horizontal force from the upper structure or further absorbing energy. A method of constructing a seismic isolation pile consisting of an outer pipe pile and an inner pile and an outer pipe pile, wherein the inner pile and the outer pipe pile each have a blade penetrating with a spiral blade fixed to a lower end portion of a steel pipe at a lower end thereof. In the case of steel pipe piles, in the construction of both inner and outer piles, first, the inner pile is driven to rotate and penetrate into the ground, and then the outer pipe pile is penetrated to cover the pile head of the inner pile. Characteristic construction method of seismic isolation pile.
る内杭と、当該内杭の杭頭部の周囲に貫入され、主とし
て当該上部構造物からの水平力に抵抗し、あるいはさら
にエネルギー吸収可能とした外管杭とが予め連結されて
なる免震杭であって、前記内杭の杭本体鋼管下端部に螺
旋状の羽根が固着され、回転駆動されて地盤中に貫入施
工される羽根付き回転貫入式鋼管杭であり、また、前記
外管杭の杭本体鋼管下端部に螺旋状の補助羽根が固着さ
れてなることを特徴とする免震杭。2. An inner pile mainly supporting a vertical load of an upper structure, and penetrating around a pile head of the inner pile, mainly resisting a horizontal force from the upper structure, or capable of further absorbing energy. A seismic isolation pile in which the outer pipe pile and the outer pile are connected in advance, and a spiral blade is fixed to the lower end of the pile body steel pipe of the inner pile, and the blade is driven to rotate and penetrates into the ground. A seismic isolation pile, which is a rotary penetrating steel pipe pile, wherein a spiral auxiliary blade is fixed to a lower end of a pile body steel pipe of the outer pipe pile.
る内杭と、当該内杭の杭頭部の周囲に貫入され、主とし
て当該上部構造物からの水平力に抵抗し、あるいはさら
にエネルギー吸収可能とした外管杭とが予め連結されて
なる免震杭であって、前記内杭の杭本体鋼管下端に螺旋
状の羽根が固着され回転駆動されて地盤中に貫入施工さ
れる羽根付き回転貫入式鋼管杭であり、中空の円錐台状
に形成され大径側の上端が前記外管杭の下端に接合され
ると共に、小径側の下端が前記内杭の杭本体鋼管の外周
に接合されたテーパー部材が設けられてなることを特徴
とする免震杭。3. An inner pile mainly supporting the vertical load of the upper structure, and penetrating around the pile head of the inner pile, mainly resisting horizontal force from the upper structure or capable of further absorbing energy. A seismic isolation pile in which the outer pipe pile and the outer pipe pile are connected in advance, wherein a spiral blade is fixed to the lower end of the pile body steel pipe of the inner pile and is driven to rotate to penetrate into the ground. A steel pipe pile having a hollow truncated cone shape, the upper end of the large diameter side is joined to the lower end of the outer pipe pile, and the lower end of the small diameter side is joined to the outer periphery of the pile body steel pipe of the inner pile. A seismic isolation pile comprising a tapered member.
に螺旋状の補助羽根が設けられてなることを特徴とする
免震杭。4. A seismic isolation pile according to claim 3, wherein a spiral auxiliary blade is provided on a tapered portion of the tapered member according to claim 3.
る内杭と、当該内杭の杭頭部の周囲に貫入され、主とし
て当該上部構造物からの水平力に抵抗し、あるいはさら
にエネルギー吸収可能とした外管杭とが予め連結されて
なる免震杭であって、前記内杭の杭本体鋼管下端部に螺
旋状の羽根が固着され回転駆動されて地盤中に貫入施工
される羽根付き回転貫入式鋼管杭であり、中空の円錐台
状に形成され大径側の上端が前記外管杭の下端に僅かな
隙間をもって対向配置されると共に、小径側の下端が前
記内杭の杭本体鋼管の外周に接合されたテーパー部材が
設けられ、前記テーパー部材の下端接合部に螺旋状の補
助羽根が固着されてなることを特徴とする免震杭。5. An inner pile mainly supporting a vertical load of an upper structure, and penetrating around a pile head of the inner pile, mainly resisting a horizontal force from the upper structure, or capable of absorbing energy. A seismic isolation pile in which the outer pipe pile and the outer pile pile are connected in advance, and a spiral blade is fixed to the lower end of the pile main body steel pipe of the inner pile, and is driven to rotate and is driven to penetrate into the ground. A penetrating steel pipe pile, which is formed in a hollow truncated conical shape and whose upper end on the large diameter side is opposed to the lower end of the outer pipe pile with a small gap, and whose lower end on the small diameter side is the pile body steel pipe of the inner pile A seismic isolation pile characterized in that a tapered member joined to the outer periphery of the tapered member is provided, and a spiral auxiliary blade is fixed to a lower end joint of the tapered member.
杭であって、前記内杭と外管杭との間の空間に弾性材が
充填されてなることを特徴とする免震杭。6. The seismic isolation pile according to claim 2, wherein a space between the inner pile and the outer pipe pile is filled with an elastic material. Seismic isolation pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000250593A JP2002061176A (en) | 2000-08-22 | 2000-08-22 | Base isolation pile and its work execution method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000250593A JP2002061176A (en) | 2000-08-22 | 2000-08-22 | Base isolation pile and its work execution method |
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| Publication Number | Publication Date |
|---|---|
| JP2002061176A true JP2002061176A (en) | 2002-02-28 |
Family
ID=18740138
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000250593A Withdrawn JP2002061176A (en) | 2000-08-22 | 2000-08-22 | Base isolation pile and its work execution method |
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| Country | Link |
|---|---|
| JP (1) | JP2002061176A (en) |
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