JP6408350B2 - Foundation pile - Google Patents

Foundation pile Download PDF

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JP6408350B2
JP6408350B2 JP2014228976A JP2014228976A JP6408350B2 JP 6408350 B2 JP6408350 B2 JP 6408350B2 JP 2014228976 A JP2014228976 A JP 2014228976A JP 2014228976 A JP2014228976 A JP 2014228976A JP 6408350 B2 JP6408350 B2 JP 6408350B2
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side member
end side
pile
bolt
foundation pile
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憲一 三輪
憲一 三輪
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SANKI KOHMUTEN CO., LTD.
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Description

本発明は、比較的軽量な工作物等を支持、固定するために地盤に打ち込まれ、又は圧入等により埋設される基礎杭に関し、より詳しくは、地盤（地面）上に、例えば、太陽光パネルの設置用の架台（枠体）や、比較的軽量の小型ハウスなどの工作物を地面上に設置する際において、それら架台等を支持、固定するために地盤（土壌中）に打ち込まれ、又は押し込みによる圧入等により埋設される基礎杭に関する。   The present invention relates to a foundation pile which is driven into the ground to support and fix a relatively light workpiece or the like, or is embedded by press-fitting or the like, and more particularly, on a ground (ground), for example, a solar panel. When installing a work (such as a frame) or a relatively lightweight small house on the ground, it is driven into the ground (in the soil) to support and fix the work, etc. It relates to foundation piles that are buried by press-fitting by pressing.

この種の基礎杭（以下、単に杭ともいう）は、通常、金属製でストレート（横断面が先後に同一）のパイプからなり、上端部（杭頭）又はその近傍に、架台（枠体）等を支持、固定（取付け）等するための取付け手段が設けられ、下端（先端）は適度に尖らされ、或いは先細り状にされているものが基本的なものといえる。すなわち、この種の基礎杭は、パイプ状の杭本体部の先端において先細りパイプ状に形成された先細り部を一体的に備えてなるものが基本的なものといえる。これらのものは、地盤中に打ち込み方式（又は圧入方式）で施工することになり、その打ち込み又は圧入（以下、本願では、単に「打ち込み」ともいう）により、周囲の地盤との摩擦力や土圧によって支持される摩擦杭であり、工事方法（施工方法）も簡易であることから、比較的軽量な工作物等を支持、固定するためによく採用されている。一方、このような基礎杭（以下、単純杭）では、それ自体の構造が簡易であることから、これに加わる重量によって沈降しやすく、また、抜けやすいなど、その設置後の耐沈降性、或いは耐引抜性（引き抜き力に対する強度ないしアンカー作用）が低く、固定力が弱いのが難点とされる。とくに、軟弱な地盤ではその問題が大きい。   This type of foundation pile (hereinafter also referred to simply as “pile”) is usually made of a metal straight pipe (the cross section is the same before and after), and has a pedestal (frame) at or near the top (pile head). An attachment means for supporting, fixing (attaching) or the like is provided, and a lower end (tip) is appropriately sharpened or tapered. That is, it can be said that this type of foundation pile is basically provided with a tapered portion integrally formed in a tapered pipe shape at the tip of a pipe-shaped pile main body. These are to be constructed in the ground by a driving method (or press-fitting method), and by the driving or press-fitting (hereinafter, simply referred to as “driving” in this application), frictional force with the surrounding ground and soil It is a friction pile supported by pressure, and since the construction method (construction method) is simple, it is often used to support and fix relatively lightweight workpieces. On the other hand, in such a foundation pile (hereinafter referred to as a simple pile), the structure itself is simple, so it is easy to settle due to the weight applied to it, and it is easy to come off. The difficulty is that the pull-out resistance (strength or anchoring action against pull-out force) is low and the fixing force is weak. The problem is particularly great on soft ground.

こうした中、螺旋杭といわれる、パイプ（円管）の外周面に螺旋を設けたネジ様のものも使用されている（例えば、特許文献１、図１参照）。このものは、ネジ構造を有するため、回転させながら地盤中に圧入するものであるから、単純杭に比べれば、埋設後における耐沈降性や耐引抜性の点で優れる。このため、比較的簡易な構造の基礎杭ではあるものの、上記架台等の設置における支持、固定用のものとしては、比較的高い安定性及び高強度の基礎となり得る。   Under such circumstances, a screw-like one called a spiral pile in which a spiral is provided on the outer peripheral surface of a pipe (circular tube) is also used (see, for example, Patent Document 1 and FIG. 1). Since this has a screw structure and is pressed into the ground while rotating, it is superior in terms of sedimentation resistance and pull-out resistance after embedding compared to simple piles. For this reason, although it is a foundation pile of a comparatively simple structure, it can become a foundation of comparatively high stability and high strength as a thing for support and fixation in installation of the above-mentioned mount.

特開２００７−２０５１０８号公報JP 2007-205108 A

ところが、上記したような螺旋杭では、その杭自体（全体）を回転させながら地盤に圧入するものであるがために、特殊の専用機（重機）が必要となるという点での難点がある。しかも、作業者は入り込めても、このような専用機を持ち込めない、例えば、狭小地や、道のない野原などでは施工ができないか、困難である。また、汎用性のある専用機や工具等の使用では、杭自体（全体）を回転させて施工することはできないことから、施工コストが増大するという点での問題もある。   However, the spiral pile as described above is press-fitted into the ground while rotating the pile itself (whole), and therefore there is a difficulty in that a special dedicated machine (heavy machine) is required. Moreover, even if an operator can enter, such a dedicated machine cannot be brought in. For example, it is difficult or difficult to perform construction in a narrow area or a field with no road. In addition, the use of a general purpose dedicated machine or a tool has a problem in that the construction cost increases because the pile itself (the whole) cannot be rotated for construction.

本発明は、このような問題点に鑑みてなされたもので、特殊の専用機（重機）を要することなく、単純くいと同様に、単に、打ち込むか、又は圧入により、その打ち込み、ないし埋設を行い得ると共に、その打ち込み後において、汎用な工具等の使用により、簡易に、耐沈降性や耐引抜性にも優れる支持が得られる基礎杭を提供することをその目的とする。   The present invention has been made in view of such a problem, and does not require a special dedicated machine (heavy machine). As is simple, it is simply driven or press-fitted to bury or bury it. It is an object of the present invention to provide a foundation pile that can be supported and easily obtained by using a general-purpose tool or the like, after which the support is excellent in sedimentation resistance and pullout resistance.

請求項１に記載の本発明は、パイプ状の杭本体部の先端から先方に先細りパイプ状に形成された先細り部を備えてなる基礎杭において、
前記杭本体部内であって該杭本体部の先端より後方には後端側部材を備えており、前記先細り部内であって該杭本体部の先端より先方又は該先細り部の先端には先端側部材を備えており、
該先端側部材と前記後端側部材とがその先後間において圧縮されて該先後間の間隔が小さくされたときに、該先後間における前記先細り部と前記杭本体部とをなす壁が、基礎杭自体の周方向において分割された状態で、外側に突出するか、張出す形で変形するように、該先後間の壁には変形容易手段が設けられており、
前記後端側部材には、ボルトの軸部が挿通可能の貫通穴が設けられている一方、
前記先端側部材には、前記ボルトの軸部に設けられた雄ネジが螺合する雌ネジが設けられており、
前記ボルトが、その軸部を前記貫通穴に挿通されて、前記雄ネジが前記雌ネジにねじ込まれ、このねじ込み状態にある該ボルトが、前記杭本体部内にその後端側の開口から挿入される工具によってねじ締めされることによって、前記先後間の間隔が小さくなるようなねじ構造を有しており、
しかも、基礎杭自体が地盤に打ち込まれることによって、前記先端側部材が後方に押圧されて前記先後間における前記先細り部と前記杭本体部とをなす壁が先後方向に圧縮力を受ける際に、該圧縮力が前記ボルトの軸部にも軸力として作用するように、該ボルトが前記後端側部材に対し後方へ移動するのを防止する後方移動防止手段を備えていることを特徴とする。 The present invention according to claim 1 is a foundation pile comprising a tapered portion formed in a tapered pipe shape from the tip of a pipe-shaped pile main body portion to the tip,
A rear end side member is provided in the pile main body portion and behind the front end of the pile main body portion, and in the tapered portion and ahead of the front end of the pile main body portion or on the front end of the tapered portion. With components,
When the front end side member and the rear end side member are compressed between the front and rear and the distance between the front and rear is reduced, the wall that forms the tapered portion and the pile main body portion between the front and rear is a foundation. In a state of being divided in the circumferential direction of the pile itself, the wall between the front and rear is provided with an easy-to-transform means so as to project outward or deform in a protruding form,
While the rear end side member is provided with a through hole through which a shaft portion of a bolt can be inserted,
The distal end side member is provided with a female screw into which a male screw provided on a shaft portion of the bolt is screwed.
The bolt is inserted through the through hole through the shaft, the male screw is screwed into the female screw, and the bolt in this screwed state is inserted into the pile main body from the opening on the rear end side. It has a screw structure such that the space between the front and rear is reduced by being screwed by a tool,
Moreover, when the foundation pile itself is driven into the ground, the tip side member is pressed backward, and the wall that forms the tapered portion and the pile main body portion between the front and rear receives a compressive force in the front-rear direction. Backward movement preventing means for preventing the bolt from moving backward relative to the rear end side member is provided so that the compressive force also acts on the shaft portion of the bolt as an axial force. .

請求項２に記載の本発明は、前記後方移動防止手段として、前記後端側部材の先端向き面又は該先端向き面における前記貫通穴の周縁に係合する係合部材が、前記ボルトの軸部に設けられていることを特徴とする請求項１に記載の基礎杭である。   According to a second aspect of the present invention, as the backward movement preventing means, an engagement member that engages with a front end facing surface of the rear end side member or a peripheral edge of the through hole in the front end facing surface is a shaft of the bolt. The foundation pile according to claim 1, wherein the foundation pile is provided at a portion.

請求項３に記載の本発明は、前記変形容易手段として、基礎杭自体の周方向に間隔をおいて、前記先後間における前記先細り部と前記杭本体部とをなす壁に、上下に連なって又は連ならずに延びるスリット又は溝が設けられていることを特徴とする請求項１又は２のいずれか１項に記載の基礎杭である。
請求項４に記載の本発明は、前記杭本体部は、横断面が先後に一定の角パイプ構造を有しており、前記先細り部は、この角パイプの先端を基端とする角錐状又は角錐台状のパイプ構造に形成されており、
前記変形容易手段として、前記先後間における前記先細り部と前記杭本体部とをなす壁のうち、横断面におけるコーナ又は該コーナ近傍に、上下に連なって又は連ならずに延びるスリット又は溝が設けられていることを特徴とする請求項１又は２のいずれか１項に記載の基礎杭である。 The present invention according to claim 3 is connected to the wall which forms the taper part and the pile main-body part in the front-rear space at intervals in the circumferential direction of the foundation pile itself as the easy deformation means. Alternatively, the foundation pile according to any one of claims 1 and 2, wherein a slit or a groove extending without being connected is provided.
The present invention according to claim 4 is characterized in that the pile main body portion has a square pipe structure with a constant cross-sectional shape, and the tapered portion has a pyramid shape with the tip of the square pipe as a base end or It is formed in a truncated pyramid-shaped pipe structure,
As the deformation facilitating means, a slit or a groove extending in the vertical direction or not in the vicinity of the corner in the cross section or in the vicinity of the corner is provided in the wall forming the tapered portion and the pile main body portion between the front and rear. It is the foundation pile of any one of Claim 1 or 2 characterized by the above-mentioned.

請求項５に記載の本発明は、前記変形容易手段として、前記上下に連なって又は連ならずに延びるスリット又は溝とは別に、
前記杭本体部と前記先細り部との境界部位、前記先後間のうちの前記先端側部材寄り部位、及び前記後端側部材寄り部位の各壁の部位に、基礎杭自体の周方向に延びるスリット又は溝が設けられていることを特徴とする請求項３又は４のいずれか１項に記載の基礎杭である。 In the present invention according to claim 5, as the easily deformable means, apart from the slit or groove extending in the vertical direction or not extending,
A slit extending in the circumferential direction of the foundation pile itself at a boundary portion between the pile main body portion and the tapered portion, a portion closer to the front end side member between the front and rear portions, and a portion closer to the rear end side member. Or it is provided with a groove | channel, It is a foundation pile of any one of Claim 3 or 4 characterized by the above-mentioned.

請求項６に記載の本発明は、前記先後間の間隔が、前記ねじ締めによって小さくなり、該間隔が所定量になったときに、そのねじ締めにおける前記ボルトの回転が空転となるように、前記雄ネジのネジ長と、該雄ネジに連なる前記軸部の外径とが設定されていることを特徴とする請求項１〜５のいずれか１項に記載の基礎杭である。
請求項７に記載の本発明は、前記後端側部材には、前記先端側部材と前記後端側部材との先後間の空間に、前記杭本体部内の後方から固結剤を注入可能の開口が設けられていることを特徴とする請求項１〜６のいずれか１項に記載の基礎杭である。 In the present invention according to claim 6, the interval between the front and rear is reduced by the screw tightening, and when the interval reaches a predetermined amount, the rotation of the bolt in the screw tightening is idle. The foundation pile according to any one of claims 1 to 5, wherein a screw length of the male screw and an outer diameter of the shaft portion connected to the male screw are set.
The present invention according to claim 7 is capable of injecting a caking agent into the rear end side member from the rear in the pile main body into the space between the front end and the rear end side member. The foundation pile according to any one of claims 1 to 6, wherein an opening is provided.

本発明の基礎杭においては、上記した構成を有することから、これを地盤に打ち込むのは、従来のパイプ製単純杭と同様に、打ち込み又は圧入によって簡易に行うことができる。そして、本発明の基礎杭によれば、杭本体部の後端側（上端）の開口から挿入する工具によるねじ締め（ねじ締め）をすることによって、前記先後間の間隔を小さくでき、これによって、該先後間における前記先細り部と前記杭本体部とをなす各壁が、基礎杭自体の周方向において分割された状態で、外側に突出するか、張り出す形での変形が得られるものとされている。この構成により、その打ち込み後は、汎用性のある、例えば、電動式インパクトレンチ等のねじ込み工具を、杭本体部の後端側（上端）の開口から挿入してねじ締めをすることで、前記した変形（塑性変形）が得られるから、簡易な作業で、耐沈降性や耐引抜性に優れる基礎杭となすことができる。このように、本発明の基礎杭では、地盤への打ち込みは、従来の単純杭と同様に簡易に行うことができる上に、その後は、ねじ締めを行うことで、前記した変形が得られるため、汎用性のある工具による簡易な作業により、耐沈降性や耐引抜性にも優れる支持が得られる、という際立って優れた効果が得られる。   Since the foundation pile of the present invention has the above-described configuration, it can be easily driven into the ground by driving or press-fitting as in the conventional pipe-made simple pile. And according to the foundation pile of this invention, the space | interval between the said front and rear can be made small by carrying out the screw fastening (screw fastening) by the tool inserted from the opening of the rear-end side (upper end) of a pile main-body part, thereby. In addition, each wall forming the tapered portion and the pile main body portion between the front and rear portions is divided in the circumferential direction of the foundation pile itself, and is projected outward or deformed in a protruding form. Has been. With this configuration, after the driving, a versatile, for example, an electric impact wrench or the like is inserted from the opening on the rear end side (upper end) of the pile body portion and screwed, Since the obtained deformation (plastic deformation) is obtained, it is possible to form a foundation pile excellent in sedimentation resistance and pull-out resistance by a simple operation. As described above, in the foundation pile of the present invention, driving into the ground can be easily performed similarly to the conventional simple pile, and thereafter, the above-described deformation can be obtained by screwing. The remarkable effect that a support excellent in sedimentation resistance and pull-out resistance can be obtained by a simple operation using a versatile tool is obtained.

すなわち、本発明では、前記杭本体部と該先細り部との境界部位（杭本体部の先端）より先方が、前記先細り部をなすことから、前記変形がなされる前の前記先後間における前記先細り部と前記杭本体部とをなす壁は、基礎杭を縦断面視したとき、その境界部位を屈曲点又は屈曲部位として屈曲したものとなっている。このため、本発明の基礎杭においては、この境界部位、すなわち、屈曲点（又は屈曲部位）を先後に跨ぐ配置にある前記先端側部材と、前記後端側部材との先後間を、上記したねじ締めによって小さくするように圧縮することで、その境界部位を屈曲点として、その壁が外側に突出するか、張出す形で変形し易いものとなっている。しかも、本発明では、該先端側部材と前記後端側部材とがその先後間において圧縮されて該先後間の間隔が小さくされたときに、該先後間における前記先細り部と前記杭本体部とをなす壁が、基礎杭自体の周方向において分割された状態で、外側に突出するか、外側に張出す形で変形するように、該先後間の壁には変形容易手段が設けられている。このため、構造の複雑化を招くことなく、上記ボルトのねじ締めを行うことのみで、その変形が得られるため、汎用性のある工具による簡易な作業により、耐沈降性や耐引抜性にも優れる支持が得られる、という際立って優れた効果が得られるのである。   That is, in the present invention, since the tip of the boundary portion (the tip of the pile main body) between the pile main body portion and the tapered portion forms the tapered portion, the taper between the front and rear before the deformation is made. The wall which forms a part and the said pile main-body part is what bent the boundary site | part as a bending | flexion point or a bending site | part, when a basic pile is seen in a longitudinal cross section. For this reason, in the foundation pile of the present invention, the boundary portion, that is, the front-rear portion between the front end side member and the rear end side member in the arrangement straddling the bending point (or the bending portion) is described above. By compressing so as to be reduced by screw tightening, the wall is projected to the outside with the boundary portion as a bending point, or is easily deformed in a protruding form. Moreover, in the present invention, when the front end side member and the rear end side member are compressed between the front and rear, and the distance between the front and rear is reduced, the tapered portion and the pile main body portion between the front and rear The wall between the front and rear is provided with an easy-to-deform means so that the wall forming the wall is divided in the circumferential direction of the foundation pile itself and protrudes outward or deforms so as to project outward. . For this reason, the deformation can be obtained only by screwing the bolt without complicating the structure, so that it is possible to achieve sedimentation resistance and pull-out resistance by a simple operation with a versatile tool. The outstanding effect that excellent support is obtained is obtained.

本発明と異なり、上記したような屈曲点（又は屈曲部位）がない、ストレートのパイプ（パイプ構造）の部分において、例え、パイプの周方向に間隔をおいて、先後（縦）にスリット又は切れ目（以下、スリット）や溝、或いは薄肉部等の変形容易手段が設けられているとしても、これを先後に圧縮することのみで、その壁が外側に突出するか、張出す形で変形させることは困難である。このため、そのような変形を得るには、パイプ内に別途、壁を外側（横方向外向き）に押す外力を付与できる機構、構造を設ける必要があり、それでは構造の複雑化を招くことになる。しかし、小径のパイプからなる基礎杭では、そのような機構、構造を設けることは困難である。これに対し、本発明の基礎杭によれば、かかる問題もなく、ねじ締めによる先後間の圧縮のみで、その変形が得られる点で、際立って優れた基礎杭といえる。なお、本発明において、「パイプ」又は「パイプ状」とは、液体を外部に漏れなく、流すことのできるパイプ（管、又は筒）に限られるものではなく、その壁（周壁）に、切れ目や貫通孔が設けられているなどの構成を有するパイプに似た構造の部材など、基礎杭になり得る限り、一見、パイプ状の構成を有するものでもよい。   Unlike the present invention, in a straight pipe (pipe structure) portion having no bending point (or bending portion) as described above, for example, a slit or a cut is formed at the front and rear (longitudinal) at intervals in the circumferential direction of the pipe. Even if easy deformation means such as (hereinafter referred to as slits), grooves, or thin-walled parts are provided, the wall can be deformed by projecting outward or projecting by simply compressing it. It is difficult. For this reason, in order to obtain such a deformation, it is necessary to provide a mechanism and a structure that can apply an external force that pushes the wall outward (laterally outward) in the pipe. Become. However, it is difficult to provide such a mechanism and structure in a foundation pile composed of small-diameter pipes. On the other hand, according to the foundation pile of the present invention, it can be said that the foundation pile is remarkably excellent in that the deformation can be obtained only by compression between the front and the rear by screw tightening without such a problem. In the present invention, the term “pipe” or “pipe shape” is not limited to a pipe (tube or cylinder) through which liquid can flow without leaking to the outside. As long as it can be a foundation pile such as a member having a structure similar to a pipe having a configuration such as a through hole or the like, it may have a pipe-like configuration at first glance.

前記先後間の壁に設ける前記変形容易手段は、パイプの強度、その壁の肉厚、横断面形状、サイズ等により、適宜に設定すればよく、特に限定されるものではなく、前記壁に、スリット（切れ目）、貫通穴、溝（又は薄肉部）、或いは切欠きを設けるか、それらの少なくともいずれか、又は、それらの適宜の組み合わせとしてもよい。これら変形容易手段は、基礎杭の地盤中への打ち込み後において、地盤の軟弱度や強度等に応じて、地盤中で土圧に抗して上記した変形を、上記ボルトを適度のトルクでネジ締めすることで得られるように設定すればよい。すなわち、前記変形容易手段は上記変形を得るための強度低下手段であり、そのネジ締めでその変形が得られるように設ければよい。   The deformation facilitating means provided on the front and rear walls may be appropriately set according to the strength of the pipe, the wall thickness, the cross-sectional shape, the size, etc., and is not particularly limited. A slit (cut), a through hole, a groove (or a thin portion), or a notch may be provided, or at least one of them, or an appropriate combination thereof. These easy-to-deform means, after driving the foundation pile into the ground, screw the bolt with an appropriate torque against the earth pressure in the ground according to the softness and strength of the ground. What is necessary is just to set so that it may be obtained by fastening. That is, the easy deformation means is a strength reducing means for obtaining the above deformation, and may be provided so that the deformation can be obtained by tightening the screw.

また、本発明の基礎杭では、前記後方移動防止手段を設けたことから、前記先後間における前記先細り部と前記杭本体部とをなす前記壁の肉厚を薄くし、該壁自体の低強度化を図ることができる。これにより、基礎杭自体を地盤に打込んだ後での前記ボルトのねじ締め（ねじ込み）による該先後間の圧縮による前記壁の変形の容易化が図られる。すなわち、上記後方移動防止手段がない場合において、基礎杭自体を地盤に打ち込む過程では、その打ち込みに起因して、前記先後間に作用する圧縮力は、その先後間における前記先細り部と前記杭本体部とをなす前記壁に作用するから、該壁の肉厚が薄く、或いは、それが低強度の場合には、その打込み時に、前記先後間における壁が座屈等の変形を起こしてしまう等の問題がある。   In the foundation pile of the present invention, since the backward movement preventing means is provided, the wall thickness of the tapered portion and the pile main body portion between the front and rear is reduced, and the strength of the wall itself is reduced. Can be achieved. Thereby, the deformation | transformation of the said wall by the compression between the front and back by screwing (screwing) of the said bolt after driving foundation foundation itself into the ground is achieved. That is, in the process of driving the foundation pile itself into the ground without the backward movement preventing means, the compressive force acting between the front and rear due to the driving is the taper portion and the pile body between the front and rear. Acting on the wall forming the part, so that if the wall is thin, or if it is of low strength, the wall between the front and rear will cause deformation such as buckling, etc. There is a problem.

これに対し、本発明のように、前記ボルトが、前記後端側部材に対し後方に移動するのを防ぐように、上記後方移動防止手段を備えたものとすることで、そのボルト自体でも、基礎杭の打ち込みに起因する前記先後方向の圧縮力を受け持つことができる。これにより、前記壁の肉厚が薄く、低強度であるとしても、打込み時において、前記したような座屈等の変形の発生を防止できる。このため、前記壁の肉厚の薄肉化を図ることができると共に、その打ち込み後におけるねじ締めによる前記壁の変形を容易にすることができるから、そのねじ締め作業の簡易化が図られる。   On the other hand, as in the present invention, the bolt is provided with the backward movement preventing means so as to prevent the bolt from moving backward with respect to the rear end side member. The compression force in the front-rear direction resulting from the driving of the foundation pile can be handled. Thereby, even if the wall is thin and has low strength, the occurrence of deformation such as buckling as described above can be prevented during driving. For this reason, the wall thickness can be reduced and the wall can be easily deformed by screw tightening after the driving, so that the screw tightening operation can be simplified.

前記ボルトは、六角ボルトなど、頭部が多角形の普通のボルトを用いることでもよいが、それに限定されるものではない。このような頭部が多角形のボルト（以下、六角ボルトともいう）では、その頭部に回螺用の工具の嵌合部を嵌合して、これを回転することでねじ締めすることで、その頭部（頭部の先端向き面）と、ボルトの軸部の雄ネジで、前記先端側部材と前記後端側部材との先後間の間隔を小さくすることになる。そして、このように、頭部が多角形のボルトを用いる場合における前記後方移動防止手段としては、請求項２に記載のような、ボルトの軸部に設けた係合部材とするのがよい。そして、このような係合部材は、ボルトの軸部に溶接によって固定してもよいし、別途、ナットを螺合してカシメや溶接により固定したものとしてもよいし、ピンを軸部においてその直径方向に打込み等により固定したものとしてもよい。なお、このような係合部材は、ボルトの回転（ねじ締め）に支障がない程度に、前記後端側部材の先端向き面、又はその先端向き面における前記貫通穴の周縁との間（先後間）に隙間（空隙）が形成されるように設ければよい。   The bolt may be an ordinary bolt having a polygonal head, such as a hexagon bolt, but is not limited thereto. In such a bolt with a polygonal head (hereinafter also referred to as a hexagonal bolt), a fitting part of a screwing tool is fitted to the head, and the screw is tightened by rotating this. The distance between the front and rear ends of the front end side member and the rear end side member is reduced by the head (surface facing the front end of the head) and the external thread of the shaft portion of the bolt. As described above, when the bolt having a polygonal head is used as the backward movement preventing means, it is preferable that the engaging member provided at the shaft portion of the bolt as described in claim 2. Such an engaging member may be fixed to the shaft portion of the bolt by welding, or may be separately screwed and fixed by caulking or welding, or the pin may be fixed at the shaft portion. It may be fixed in the diameter direction by driving or the like. In addition, such an engaging member is between the front end facing surface of the rear end side member or the peripheral edge of the through hole on the front end facing surface so as not to hinder the rotation (screw tightening) of the bolt. It suffices if a gap (gap) is formed between the two.

上記したように、本発明において用いるボルトは、このような六角ボルトに限られるものではなく、全ネジボルトや、丸棒の先端又は先端寄り部位に雄ネジを形成してなるねじ部材であって、その先後の中間部位に、上記頭部付きのボルトの頭部（多角形部）の役割をする大径部を設け、その大径部より後方に、別途、ボルトを回螺用の工具でねじ締めするための嵌合部（例えば、回螺用工具の嵌合部が嵌合する多角形部（頭部付きのボルトの頭部に相当する部位））を設けたものとしてもよい。そして、このようなボルトを用いる場合には、その先後の中間部位に設けた大径部において、ボルトが後方に移動するのを防止するようにしてもよい。すなわち、この場合の前記後方移動防止手段としては、前記ボルトの軸部に前記圧縮力が作用した際に、それが後端側部材に対し後方へ移動するのが防止されるように、この大径部の後端向き面において、別の部材が係合するように、杭本体部内にその別の部材を溶接や打ち込み等により設けることとしてもよい。   As described above, the bolt used in the present invention is not limited to such a hexagonal bolt, it is a screw member formed by forming a male screw at the tip of a round bar or a tip end of a round bar, A large-diameter portion that serves as the head (polygonal portion) of the bolt with the head is provided in the intermediate portion at the front and rear, and the bolt is separately screwed with a tool for screwing behind the large-diameter portion. It is good also as what provided the fitting part (For example, the polygon part (part corresponded to the head of the bolt with a head) which the fitting part of the tool for screwing fits) for fastening. And when using such a volt | bolt, you may make it prevent a volt | bolt moving to the back in the large diameter part provided in the intermediate part ahead and behind. In other words, the backward movement preventing means in this case is such that it is prevented from moving backward relative to the rear end side member when the compressive force is applied to the shaft portion of the bolt. It is good also as providing the other member in a pile main-body part by welding, driving | running, etc. so that another member may engage in the rear-end-facing surface of a diameter part.

なお、前記ボルトの軸部に設ける雄ネジは、ねじ締めが可能なように、その先端又は先端寄り部位に、適当長さ設けられていればよい。また、前記雌ネジは、先端側部材にナットを溶接しても形成することもできるが、この場合は、そのナットも先端側部材を構成することになる。なお、ナット自体を先端側部材としてもよい。   In addition, the external thread provided in the axial part of the said bolt should just be provided in the suitable length in the front-end | tip or the position near a front-end | tip so that screw fastening is possible. The female screw can also be formed by welding a nut to the tip side member. In this case, the nut also constitutes the tip side member. Note that the nut itself may be the tip side member.

本発明の前記変形容易手段は、上記もしたように、適宜の手段とすることができるが、前記壁が、基礎杭自体の周方向において分割された状態に容易にするためには、請求項３に記載の本発明のように設けるのがよい。そして、請求項４に記載の本発明のように、角パイプ構造を有するもの（例えば、一般構造用角形鋼管（横断面略正方形（等辺）の四角パイプ）。以下、単に角パイプともいう）では、前記変形容易手段としては、前記先後間における前記先細り部と前記杭本体部とをなす壁のうち、横断面におけるコーナ（角パイプの角部）又は該コーナ近傍に、上下に連なって又は連ならずに延びるスリット又は溝が設けられているとよい。本願において角錐又は角錐台は、数学（図学）的意味におけるそれらを意味するものではなく、一般、構造物において使用される意味におけるそれらを指称する。なお、本発明において、角パイプには、鋼管からなるもの（例えば、一般構造用角形鋼管）の他、その全体、又は部分を、例えば、平鋼のような帯状板材（又は板材）から溶接等により、形成したものも含まれる。   The deformation facilitating means of the present invention can be an appropriate means as described above, but in order to facilitate the state that the wall is divided in the circumferential direction of the foundation pile itself, It is good to provide like 3 this invention. Further, as in the present invention according to claim 4, in the case of having a square pipe structure (for example, a general structural square steel pipe (a square pipe having a substantially square cross section (equal side)). As the means for easily deforming, among the walls forming the tapered portion and the pile main body portion between the front and rear sides, a corner (corner portion of a square pipe) in the cross section or the vicinity of the corner is connected vertically or continuously. It is preferable that a slit or a groove extending without being provided. In the present application, pyramids or truncated pyramids do not mean those in mathematical (graphical) sense, but generally refer to them in the meaning used in structures. In the present invention, the square pipe is made of a steel pipe (for example, a general structural square steel pipe), or the whole or a part thereof is welded from, for example, a belt-like plate material (or plate material) such as a flat steel. Thus, the formed one is also included.

また、本発明において、前記変形をより容易に得られるようにするには、請求項５に記載の本発明のように、前記変形容易手段として、前記上下に連なって又は連ならずに延びるスリット又は溝とは別に、前記杭本体部と前記先細り部との境界部位、前記先後間のうちの前記先端側部材寄り部位、及び前記後端側部材寄り部位の各壁の部位に、基礎杭自体の周方向（横方向）に延びるスリット又は溝が設けられているのがよい。このようにしておけば、上下の３つの各部位で発生する応力集中により、前記境界部位を頂部として、これを先後に挟む形で、前記先後間の壁を外側に突出させるか、張り出させる変形、例えば、外方に凸となす「く」の字形の屈曲となる変形が容易に得られるためである。なお、ねじ締めに使用する工具は、基礎杭の長さ等に応じて使用できる適宜の工具を用いればよい。例えば、ボルトの頭部に嵌合する嵌合部を有する回螺工具（例えば、軸（柄）の長いボックスレンチ）を杭本体部の後端側の開口から挿入して、それをボルトの頭部に嵌合させて、電動等のインパクトレンチでねじ締めすればよい。   Further, in the present invention, in order to obtain the deformation more easily, as in the present invention according to claim 5, as the deformation easy means, a slit extending in the up and down direction or not extending. Alternatively, apart from the groove, the foundation pile itself at the boundary portion between the pile main body portion and the tapered portion, the portion closer to the front end side member and the portion closer to the rear end side member in the front and rear portions, It is preferable that a slit or a groove extending in the circumferential direction (lateral direction) is provided. If it does in this way, by the stress concentration which generate | occur | produces in each of three upper and lower parts, the boundary part is made into the top part, and the wall between the front and rear is made to protrude outside or is projected so as to sandwich the front and rear. This is because a deformation, for example, a deformation that forms an outwardly convex “K” shape can be easily obtained. In addition, what is necessary is just to use the appropriate tool which can be used according to the length etc. of a foundation pile as a tool used for screw fastening. For example, a screwing tool (for example, a box wrench having a long shaft (handle)) having a fitting portion to be fitted to the head of the bolt is inserted from the opening on the rear end side of the pile main body, and is inserted into the head of the bolt. It is only necessary to fit the part and screw it with an electric impact wrench.

請求項６に記載の本発明においては、前記先後間の間隔が、前記ねじ締めによって小さくなり、該間隔が所定量になったときに、そのねじ締めにおける回転が空転となる。これにより、ねじ締め作業者においては、変形させるべき所定の変形量が確保できたことを、簡易に知ることができるので、作業者によるバラツキのない適切かつ安定した施工が確保される。雄ネジ長は、適度の変形が得られるように設定すればよい。なお、請求項７に記載の本発明のように、固結材を注入できるものとしておくのがよい。これにより、その注入によって、変形した後の前記空間内の強度アップ及び耐久性向上が容易に得られる。固結剤としては、セメントやモルタル等があげられ、これらをスラリー等として注入すればよいが、固結材は注入でき、グラウト材となり得るものであればよい。   In this invention of Claim 6, when the space | interval between the said front and back becomes small by the said screw fastening, when this space | interval becomes predetermined amount, the rotation in the screw fastening will be idling. As a result, the screw tightening operator can easily know that the predetermined deformation amount to be deformed can be secured, so that appropriate and stable construction without variation by the operator is ensured. The male screw length may be set so as to obtain an appropriate deformation. Note that, as in the present invention described in claim 7, it is preferable to be able to inject a consolidated material. Thereby, the injection | pouring can obtain easily the intensity | strength improvement and durability improvement in the said space after deform | transforming. Examples of the caking agent include cement and mortar. These may be injected as a slurry or the like, but any caking material can be used as long as it can be injected and become a grout material.

本発明の基礎杭は、杭本体部を含め、通常、金属製のパイプであり、代表例としては横断面が等辺の薄肉の角パイプ（一般構造用角形鋼管）とするのがコスト面で好ましいといえるが、アルミニウム又はアルミニウム合金製としてもよいなど、その材質は、強度や耐食性に応じて適宜に選択すればよい。ただし、本発明の基礎杭、又はこれをなす杭本体部等は、材質に限られず、板材から溶接等によりパイプ構造に組立てられ、又は製造されたものでもよいし、このようなパイプ構造のもの（パイプ）と、一般構造用角形鋼管等のパイプとをつないでなるパイプとしてもよいのは上記したとおりである。   The foundation pile of the present invention is usually a metal pipe including the pile main body, and as a typical example, it is preferable in terms of cost to use a thin-walled square pipe (general structural square steel pipe) having an equal cross section. However, the material may be appropriately selected according to strength and corrosion resistance, such as aluminum or an aluminum alloy. However, the foundation pile of the present invention, or the pile main body forming the same, is not limited to the material, and may be assembled or manufactured from a plate material by welding or the like, or of such a pipe structure. As described above, the pipe may be formed by connecting a (pipe) and a pipe such as a general structural square steel pipe.

本発明の基礎杭を具体化した実施形態例１（第１実施例）の正面図（立面図）、及びその要部の一部破断拡大縦半断面図。BRIEF DESCRIPTION OF THE DRAWINGS The front view (elevation figure) of Embodiment 1 (1st Example) which actualized the foundation pile of this invention, and the partially broken expansion vertical half sectional view of the principal part. 図１の先後（上下）方向の各位置における横断面図。FIG. 2 is a cross-sectional view at each position in the front-rear (up and down) direction of FIG. 1. 図１の基礎杭の製造組立て過程、及び要部の説明用の分解図。The assembly assembly process of the foundation pile of FIG. 1, and the exploded view for description of the principal part. Ａは、図１の基礎杭を地盤中に打ち込んだ後、ボルトを回転して変形をさせる途中を説明する要部の一部破断拡大縦半断面図、Ｂは、ボルトが空転するまで回転させた変形後を説明する要部の一部破断拡大縦半断面図。1 is a partially broken enlarged vertical half-sectional view of the main part for explaining the middle of the deformation of the foundation pile shown in FIG. 1 after being driven into the ground, and B is rotated until the bolt is idled. The partially broken expansion vertical half sectional view of the principal part explaining after a deformation | transformation. 図４のＢを先端側から見た図。The figure which looked at B of Drawing 4 from the tip side. 図１の基礎杭において、係合部材（後方移動防止手段）が設けられておらず、壁強度が低いために地盤中に打ち込む際、又はその打込み過程で変形してしまう状態を説明する図。In the foundation pile of FIG. 1, the engagement member (rearward movement prevention means) is not provided, and is a view for explaining a state where the wall is low and the wall is deformed or is deformed during the driving process. 本発明の基礎杭を具体化した第２実施例の要部の拡大縦半断面図。The expanded vertical half sectional view of the principal part of 2nd Example which actualized the foundation pile of this invention. Ａは、図１の基礎杭を地盤中に打ち込んだ後、ボルトを回転して変形をさせる途中を説明する要部の拡大縦半断面図、Ｂは、ボルトが空転するまで回転させた変形後を説明する要部の拡大縦半断面図。1A is an enlarged vertical half sectional view of the main part for explaining the middle of the deformation of the foundation pile shown in FIG. 1 after being driven into the ground, and B is after the deformation of rotating the bolt until it is idle. The expanded vertical half sectional view of the principal part explaining A. 第２実施例において、後方移動防止手段を変更した別例を説明図であって、Ａは要部の拡大縦半断面図、Ｂはその平面図（後端側から見た図）。In 2nd Example, it is explanatory drawing which changed the back movement prevention means, Comprising: A is an expanded vertical half sectional view of the principal part, B is the top view (figure seen from the rear end side).

本発明に係る基礎杭を具体化した実施の形態例１（第１実施例）について、図１〜図５を参照しながら説明する。本例の基礎杭１００は、先後（図示上下）に横断面が一定の角（横断面、略正方形の四角）パイプ状の杭本体部２０の先端（図示下端）２３において、その先端２３を基端として先方（図示下方）に、四角すい状で先細りパイプ状に形成された先細り部３０を一体的に備えたものであり、いずれも鋼材から形成されている。そして、杭本体部２０内であって、その先端２３より所定量後方（図示上方）には、その横断面を、外側に突出しないで横断するように形成された後端側部材（板材）４０を備えている。本例では、この後端側部材４０は、パイプ状の杭本体部２０の壁（平板部分）２５の外周に沿って溶接されている。すなわち、本例では、後端側部材４０は、杭本体部２０の先端寄り部位に配置されており、後端側部材４０の先後において杭本体部２０を突き合わせるようにして溶接した構成を有している。そして、この後端側部材４０のうち、杭本体部（パイプ）２０の中心に相当する位置には、頭部付きのボルト（例えば、六角ボルト）５０の頭部５３が係止され、かつボルト５０の軸部５４を隙間を保持して挿通させるため、先後に貫通する貫通穴（円穴）４３が設けられている。   Embodiment 1 (first embodiment) embodying a foundation pile according to the present invention will be described with reference to FIGS. The foundation pile 100 of the present example is based on the tip 23 at the tip (lower end in the drawing) 23 of the pipe-shaped pile main body portion 20 having a constant cross section (horizontal cross section, a substantially square square) at the front and rear (upper and lower sides in the drawing). A tapered portion 30 integrally formed in the shape of a tapered pipe in the shape of a square cone is provided at the end (lower side in the drawing) as an end, and both are formed from steel. And the rear end side member (plate | board material) 40 formed in the pile main-body part 20, Comprising: A predetermined amount back (upward illustration) from the front-end | tip 23 is formed so that the cross section may be crossed without protruding outside. It has. In this example, the rear end side member 40 is welded along the outer periphery of the wall (flat plate portion) 25 of the pipe-shaped pile main body 20. That is, in this example, the rear end side member 40 is disposed near the tip of the pile main body portion 20, and has a configuration in which the pile main body portion 20 is welded so as to abut the front end of the rear end side member 40. doing. And the head 53 of the bolt (for example, hexagon bolt) 50 with a head is latched in the position corresponded to the center of the pile main-body part (pipe) 20 among this rear end side member 40, and bolt A through-hole (circular hole) 43 penetrating the shaft 50 is provided in order to allow the 50 shaft portions 54 to be inserted while maintaining a gap.

一方、先細り部３０内であって、杭本体部２０の先端２３より所定量先方（図示下方。先細り部３０の先後の中間）には、その横断面を、外側に突出しないで横断するように形成された先端側部材（板材）６０を備えている。この先端側部材６０は、四角すいで先細り状をなす先細り部（パイプ状の構造体）３０の壁３５の外周に沿って溶接されている。ただし、この先端側部材６０のうち、先細り部（四角すいパイプ構造）３０の中心に相当する位置には、ボルト５０の軸部５４を隙間を保持して挿通できる貫通穴（円穴）６３が設けられており、その先端向き面（下面）には、ボルト５０の軸部５４の先端側に設けられた雄ネジ５７をねじ込むための雌ネジを備えたナット６５が溶接されており、本例ではこのナット６５も含め、先端側部材６０をなしている。なお、先端側部材６０自体に直接雄ネジ５７をねじ込むためのネジ穴（雌ネジ）を形成しておいてもよい。   On the other hand, within the tapered portion 30, a predetermined amount ahead of the tip 23 of the pile main body portion 20 (downward in the figure, intermediate between the front and rear of the tapered portion 30) is to cross the transverse section without protruding outward. A formed distal end side member (plate material) 60 is provided. The distal end side member 60 is welded along the outer periphery of the wall 35 of the tapered portion (pipe-like structure) 30 that is tapered by a square corner. However, a through hole (circular hole) 63 through which the shaft portion 54 of the bolt 50 can be inserted with a gap is provided at a position corresponding to the center of the tapered portion (square-piped pipe structure) 30 in the distal end side member 60. A nut 65 having a female screw for screwing a male screw 57 provided on the tip side of the shaft portion 54 of the bolt 50 is welded to the tip-facing surface (lower surface). Then, the tip side member 60 including the nut 65 is formed. In addition, you may form the screw hole (female screw) for screwing the male screw 57 directly in the front end side member 60 itself.

また本例では、上記した後端側部材４０には、杭本体部２０を後方から見たとき（図２のＳ１−Ｓ１断面、Ｓ２−Ｓ２断面参照）、対向するその角寄り部位に開口（貫通穴）４４が設けられており、この開口４４を介して、杭本体部（四角のパイプ）２０内が、先後（上下）に連通するように形成されている。これにより、杭本体部２０内の後方（パイプの後端の開口）から、注入後に固結する液状又は流動体状の固結剤（例えばセメントスラリー）を、この後端側部材４０と先端側部材６０との先後間の空間に注入できるようにされている。   Moreover, in this example, when the pile main-body part 20 is seen from back (refer S1-S1 cross section of FIG. 2, S2-S2 cross section), it opens to the above-mentioned rear end side member 40 at the corner | angular part which opposes ( A through hole) 44 is provided, and the inside of the pile main body (square pipe) 20 is formed to communicate with the front and rear (up and down) through the opening 44. Thereby, from the rear (opening of the rear end of the pipe) in the pile main body portion 20, a liquid or fluid-like solidifying agent (for example, cement slurry) that solidifies after injection is supplied to the rear end side member 40 and the front end side. Injection into the space between the front and rear of the member 60 is possible.

なお、本例の基礎杭１００は、横断面一定のパイプ状の杭本体部２０と、その先端（下端）２３において、先細りパイプ状に形成された先細り部３０とからなる１本のパイプ構造を呈しているが、この先細り部３０のうちの、先端側部材６０より後方の部位と、杭本体部２０のうちの、後端側部材４０より先方の部位とが、先後に一体のものとして事前に構成されている。そして、詳細は後述するが、この先端側部材６０と後端側部材４０との先後間における部位をなす壁２５，３５には、この先端側部材６０と後端側部材４０とがその先後間において圧縮されて、その先後間の間隔が小さくされたときに、その壁２５，３５が、基礎杭自体の周方向において分割された状態で、外側に突出するか、張出す形で変形するように、変形容易手段が設けられている。   In addition, the foundation pile 100 of this example has one pipe structure which consists of the pipe-shaped pile main-body part 20 with a constant cross section, and the taper part 30 formed in the front-end | tip (lower end) 23 in the shape of a taper pipe. Although it has shown, the site | part behind the front end side member 60 of this taper part 30, and the site | part ahead of the rear end side member 40 of the pile main-body part 20 are integrated as a thing ahead of time beforehand. It is configured. As will be described in detail later, the front end side member 60 and the rear end side member 40 are arranged between the front and rear sides of the walls 25 and 35 forming the portion between the front end side member 60 and the rear end side member 40. The wall 25, 35 is divided in the circumferential direction of the foundation pile itself so that it protrudes outward or deforms in a protruding form when the space between the front and rear is reduced. Further, a means for easily deforming is provided.

本例の基礎杭１００では、後端側部材４０に設けられた貫通穴４３に、後方から六角ボルト５０の軸部５４が挿通されており、その先端又は先端寄り部位に設けられた雄ネジ５７が、先端側部材６０をなすナット（雌ネジ）６５に螺合されたネジ構造を有しており、このネジ構造によってその両部材４０，６０を連結している。なお、本例では、後端側部材４０と、六角ボルト５０の頭部５３との間には、ワッシヤ（座金。スリップ用のワッシャ）５９が介在されており、その状態のもとで、六角ボルト５０がねじ込み方向に回転され、少なくともネジが、そのねじ込み状態から外れない適度の螺合状態とされて、その連結が確保されている。これにより、本例の基礎杭１００においては、その六角ボルト５０を、その頭部５３に、杭本体部２０内にその後端側の開口から挿入される柄の長いボックスレンチ等の工具（図示せず）における嵌合部を嵌合して、ねじ締めをすることによって、先端側部材６０と後端側部材４０との先後間を圧縮でき、その先後間の間隔を小さくするようなネジ構造とされている。なお、このネジ構造においては、先端側部材６０と後端側部材４０との先後間が適度の圧縮状態になるように、ボルト５０の雄ネジ５７が、先端側部材６０をなすナット（雌ネジ）６５にねじ込まれていてもよいが、その頭部５３が、ワッシヤ５９の厚み以上、後端側部材４０の後端向き面（図示上面）より、若干、浮いており、緩んだ状態にあり、そのような圧縮状態になくてもよい。   In the foundation pile 100 of this example, the shaft portion 54 of the hexagon bolt 50 is inserted from the rear into the through hole 43 provided in the rear end side member 40, and the male screw 57 provided at the tip or a portion near the tip. However, it has the screw structure screwed together by the nut (female screw) 65 which makes the front end side member 60, The both members 40 and 60 are connected by this screw structure. In this example, a washer (washer, slip washer) 59 is interposed between the rear end side member 40 and the head 53 of the hexagon bolt 50. The bolt 50 is rotated in the screwing direction, and at least the screw is brought into an appropriate screwed state so as not to be removed from the screwed state, so that the connection is ensured. Thereby, in the foundation pile 100 of this example, the tool (not shown) such as a long box wrench having a handle inserted into the head 53 of the hexagon bolt 50 from the rear end side opening into the pile body 20. A screw structure that can compress the front-rear portion of the front-end side member 60 and the rear-end-side member 40 by fitting the fitting portion in FIG. Has been. In this screw structure, the male screw 57 of the bolt 50 is a nut (female screw) that forms the front end side member 60 so that the front-rear space between the front end side member 60 and the rear end side member 40 is in an appropriately compressed state. ) May be screwed into 65, but the head 53 is slightly floated and loosened from the rear end-facing surface (the upper surface in the drawing) of the rear end side member 40 by the thickness of the washer 59 or more. In such a compressed state, it is not necessary.

一方、上記したネジ構造におけるそのボルト５０の軸部５４には、ボルト５０が後端側部材４０に対し、後方に移動するような作用を受けたとしても、その移動が止められるように、後端側部材４０の先端向き面（図示下面）４５、又は先端向き面４５における貫通穴４３の周縁に係合するように、その先端向き面４５と、例えば、１ｍｍ〜５ｍｍの空隙が保持される位置で、リング状の係合部材７０が溶接等により固定されている。これにより、基礎杭１００自体が地盤に打ち込まれることで、先端側部材６０が後方に押圧されて前記先後間における先細り部３０と杭本体部２０とをなす壁２５が先後方向に圧縮力を受ける際に、該圧縮力がボルト５０の軸部５４にも軸力として作用するようにされている。このように本例では、このように設けられた係合部材７０が、ボルトの後方移動防止手段をなしている。なお、上記したようにボルト５０の頭部５３が、ワッシヤ５９の厚み以上、後端側部材４０の後端向き面（図示上面）より、浮いているようなときには、後端側部材４０の先端向き面４５と係合部材７０との間には空隙がなくともよい。ボルト５０のねじ込み（回転）に支障はないためである。なお、この場合には、上記のように、前記先後間における先細り部３０と杭本体部２０とをなす壁２５に先後方向に圧縮力が作用するのと同時に、ボルト５０の軸部にも軸力（圧縮力）が作用する。   On the other hand, the shaft portion 54 of the bolt 50 in the above-described screw structure has a rear portion so that the movement is stopped even if the bolt 50 is subjected to an action of moving backward with respect to the rear end side member 40. The front-facing surface 45 of the end-side member 40 (the lower surface in the drawing) 45 or the front-facing surface 45 and a gap of, for example, 1 mm to 5 mm are held so as to engage with the peripheral edge of the through hole 43 in the front-facing surface 45. At the position, the ring-shaped engaging member 70 is fixed by welding or the like. Thereby, when the foundation pile 100 itself is driven into the ground, the distal end side member 60 is pressed rearward, and the wall 25 that forms the tapered portion 30 and the pile main body portion 20 between the front and rear receives a compressive force in the front-rear direction. At this time, the compressive force acts on the shaft portion 54 of the bolt 50 as an axial force. Thus, in this example, the engaging member 70 provided in this way constitutes a bolt rearward movement preventing means. As described above, when the head 53 of the bolt 50 floats from the rear end-facing surface (the upper surface in the drawing) of the rear end side member 40 by the thickness of the washer 59 or more, the front end of the rear end side member 40 is used. There may be no gap between the facing surface 45 and the engaging member 70. This is because there is no hindrance to screwing (rotation) of the bolt 50. In this case, as described above, the compressive force acts in the front-rear direction on the wall 25 that forms the tapered portion 30 and the pile main body portion 20 between the front and rear, and at the same time, the shaft portion of the bolt 50 also has a shaft. Force (compression force) acts.

また、このボルト５０のネジ（雄ネジ５７）は、その軸部５４の全長に設けられていてもよいが、本例では、軸部５４の先端寄り部位において、所定の長さＬ１とされている。そして、その長さＬ１分のねじ締め後は、ナット６５の雌ネジから離脱して空転するように設定されている。すなわち、その雄ネジ５７に連なる部位の軸部５４ａは、その外径が、雄ネジ５７の谷径以下に、小さくされ、かつ、その長さＬ２はナット６５の高さより大きくされている。なお、このネジ構造は、本例基礎杭１００の製造、組み立て工程中において得ることになる。そして、本例の基礎杭１００は、後端側部材４０より後方の部位が、一般構造用角形鋼管を適寸法の長さで切断したものからなっており、例えば、次のようにして製造、組立てられる（図３参照）。   Further, the screw (male screw 57) of the bolt 50 may be provided over the entire length of the shaft portion 54, but in this example, a predetermined length L1 is provided at a portion near the tip of the shaft portion 54. Yes. Then, after the screw tightening for the length L1, the nut 65 is set so as to be separated from the female screw and idle. That is, the shaft portion 54 a that is connected to the male screw 57 has an outer diameter that is smaller than or equal to the root diameter of the male screw 57 and a length L 2 that is greater than the height of the nut 65. This screw structure is obtained during the manufacturing and assembling process of the foundation pile 100 of this example. And as for the foundation pile 100 of this example, the site | part behind the rear-end side member 40 consists of what cut | disconnected the square steel pipe for general structures by the length of an appropriate dimension, for example, manufactured as follows, Assembled (see FIG. 3).

すなわち、図３の左上に示したように、後端側部材４０の貫通穴４３にボルト５０を後方から、ワッシャ５９を介して挿通し、頭部５３が、後端側部材４０の後端向き面にワッシャ５９を介して、当接するように保持し、その軸部５４のうち、後端側部材４０の先端向き面４５と適度の空隙が保持される位置に、係合部材７０を外嵌して位置決めして溶接等により固定する。一方、図３の左下に示したように、先細り部３０のうちの、先端側部材６０より後方の部位と、杭本体部２０のうちの、後端側部材４０より先方の部位とが、先後に一体のものとして構成された部位（変形対象パイプ部位）２１の先端に対しては、ナット６５の溶接前の先端側部材６０をあてがって溶接しておく。そして、この変形対象パイプ部位２１に、前記したようにして、後端側部材４０にボルト５０及び係合部材７０を組み付けた組み付け体におけるボルト５０の軸部を内挿し、その先端の雄ネジ５７を先端側部材６０の貫通穴６３に遊挿する。そして、後端側部材４０を変形対象パイプ部位２１の後端に位置決めしてあてがって溶接し、先端側部材６０の貫通穴６３から突出する雄ネジ５７にナット６５をねじ込み、このナット６５を先端側部材６０の先端向き面にあてがうようにして溶接して一体化する。その後、後端側部材４０に、それより後方の前記鋼管からなる杭本体部２０を突き合わせて溶接し、先端側部材６０には、先細り部３０のうち、先方の尖った部位を含む部位（キャップ状部位）３７を、その後端において突き合わせて溶接する。こうすることで、図１に示した基礎杭１００として組立てられる。なお、この組立て手順は一例であり、これに限定されるものではない。例えば、この組立てにおいて、変形対象パイプ部位２１の先端に溶接されている先端側部材６０に、事前にナット６５を溶接しておいてもよい。この場合には、上記組み付け品におけるボルト５０の軸部を内挿し、その先端の雄ネジ５７を先端側部材６０の雌ネジ（ナット６５）に所定量ねじ込み、そして、後端側部材４０を変形対象パイプ部位の後端に位置決めしてあてがい溶接すればよい。   That is, as shown in the upper left of FIG. 3, the bolt 50 is inserted into the through-hole 43 of the rear end side member 40 from the rear side through the washer 59 so that the head 53 faces the rear end of the rear end side member 40. The engagement member 70 is externally fitted in a position where the front end facing surface 45 of the rear end side member 40 and an appropriate gap are held in the shaft portion 54. And then fixed by welding or the like. On the other hand, as shown in the lower left of FIG. 3, a portion of the tapered portion 30 that is behind the front end side member 60 and a portion of the pile main body portion 20 that is ahead of the rear end side member 40 are The tip side member 60 before welding of the nut 65 is applied to the tip of the part (deformation target pipe part) 21 that is configured as an integral part later and welded. Then, in the pipe part 21 to be deformed, as described above, the shaft portion of the bolt 50 in the assembly in which the bolt 50 and the engaging member 70 are assembled to the rear end side member 40 is inserted, and the male screw 57 at the tip is inserted. Is freely inserted into the through hole 63 of the distal end side member 60. Then, the rear end side member 40 is positioned and applied to the rear end of the pipe part 21 to be deformed, and a nut 65 is screwed into the male screw 57 protruding from the through hole 63 of the front end side member 60. They are integrated by welding so as to be applied to the tip-facing surface of the side member 60. Then, the pile main body part 20 which consists of the said steel pipe behind it is abutted and welded to the rear end side member 40, and the part (cap) of the taper part 30 is included in the front end side member 60. Shaped part) 37 is abutted and welded at the rear end. By doing so, the foundation pile 100 shown in FIG. 1 is assembled. This assembly procedure is an example, and the present invention is not limited to this. For example, in this assembly, the nut 65 may be welded in advance to the distal end side member 60 welded to the distal end of the pipe part 21 to be deformed. In this case, the shaft portion of the bolt 50 in the assembled product is inserted, the male screw 57 at the tip thereof is screwed into the female screw (nut 65) of the tip side member 60, and the rear end side member 40 is deformed. What is necessary is just to position and weld to the rear end of a target pipe part.

さて、上記もしたように、本例においては、先端側部材６０と後端側部材４０とがその先後間において圧縮されて、この先後間の間隔が小さくされたときに、その先後間における先細り部３０と杭本体部２０とをなす各パイプ部位の壁２５、３５が、基礎杭１００自体の周方向において分割された状態で、外側に突出するか、外側に張出す形で容易に変形できるように、その先後間の壁２５，３５には、変形容易手段（本例では、スリット）が設けられている。すなわち、本例では、先端側部材６０と後端側部材４０との先後間における先細り部３０と杭本体部２０とをなす壁２５，３５のコーナ（角パイプのコーナ（角部）又はそのコーナ近傍）において変形容易手段として、スリット（縦スリット）Ｔｓが上下に連なって設けられており、この先後間において、各壁２５、３５は、基礎杭１００自体の周方向に当所から４つに分割されたものとされている（図１、図２参照）。なお、このスリットＴｓは本例では上下に連なっているが、例えば、杭本体部２０と先細り部３０との先後の境界部位である屈曲部位（杭本体部２０の先端２３）で分断され、連なっていなくともよい。各壁２５、３５の強度に応じて変形容易手段として機能するように、適宜に設定すればよい。   As described above, in the present example, when the front end side member 60 and the rear end side member 40 are compressed between the front and rear, and the distance between the front and rear is reduced, the taper between the front and rear is reduced. The walls 25 and 35 of each pipe part forming the part 30 and the pile main body part 20 can be easily deformed by protruding outward or projecting outward while being divided in the circumferential direction of the foundation pile 100 itself. As described above, the walls 25 and 35 between the front and rear sides are provided with easy-to-transform means (in this example, slits). That is, in this example, the corners of the walls 25 and 35 that form the tapered portion 30 and the pile main body portion 20 between the front and rear ends of the front end side member 60 and the rear end side member 40 (corner corners of the square pipe or corners thereof). In the vicinity), slits (vertical slits) Ts are provided as upper and lower continuous means as deformation means, and in the front and rear, each wall 25, 35 is divided into four from the center in the circumferential direction of the foundation pile 100 itself. (See FIGS. 1 and 2). In addition, although this slit Ts is connected to the upper and lower sides in this example, for example, the slit Ts is divided at the bent portion (the tip 23 of the pile main body portion 20) that is a boundary portion between the pile main body portion 20 and the tapered portion 30 and connected. It does not have to be. What is necessary is just to set suitably so that it may function as a deformation | transformation easy means according to the intensity | strength of each wall 25 and 35. FIG.

また、本例では、この変形容易手段に加え、その先後間のうち、後端側部材４０寄り部位（後端側部材４０の近傍）、杭本体部２０と先細り部３０との先後の境界部位である屈曲部位（杭本体部２０の先端２３）、及び先端側部材６０寄り部位（先端側部材６０の近傍）の各部位（先後の３箇所）において、コーナにおいて上下に連なって形成されているスリット（縦スリット）Ｔｓから、各壁（周方向における４つの壁）２５，３５とも、その両側から横方（周方向）に部分的に切り込む形で延びる（切断する）ようにスリット（横スリット）Ｙｓ１，Ｙｓ２，Ｙｓ３が設けられている。このように、本例では、上下に延びるスリットＴｓのほか、前記先後間をなす各壁（平板部分）２５，３５とも、その先後における３箇所において、横方向に延びるスリットＹｓ１，Ｙｓ２，Ｙｓ３が設けられていることから、その各スリット（横スリット）の箇所（３箇所）は、局所的に低強度とされている。   Moreover, in this example, in addition to this deformation | transformation easy means, the rear end side member 40 side part (near the rear end side member 40) among the front and back, the front-rear boundary part of the pile main-body part 20 and the taper part 30 In each of the bent parts (the tip 23 of the pile body 20) and the parts near the tip side member 60 (near the tip side member 60) (the previous three points), the corners are formed continuously in the corner. From the slit (longitudinal slit) Ts, each wall (four walls in the circumferential direction) 25 and 35 extends (cuts) so as to be partially cut laterally (circumferentially) from both sides thereof. ) Ys1, Ys2, and Ys3 are provided. Thus, in this example, in addition to the slit Ts extending vertically, each of the walls (flat plate portions) 25, 35 forming the front-rear side has slits Ys1, Ys2, Ys3 extending in the lateral direction at three points in the front-rear direction. Since it is provided, the location (three locations) of each slit (lateral slit) is locally low in strength.

これにより、上記のネジ構造において、その六角ボルト５０を、頭部５３を介してねじ締めする（ねじ込む）ことにより、先端側部材６０と後端側部材４０の先後間を締め上げるように圧縮して、その先後間の間隔が小さくなるようにすると、その圧縮状態に応じて、その先後間の周方向における４つの各壁２５，３５は、先端側部材６０寄り部位、及び後端側部材４０寄り部位のスリットＹｓ１，Ｙｓ３を基点として、境界部位である屈曲部位、すなわち、杭本体部の先端２３（杭本体部２０と先細り部３０との先後の境界部位）に設けられたスリットＹｓ２の部位が頂部をなして横向き「Ｖ」字状に突出する（張り出す）形で変形するように形成されている（図４のＡ，Ｂ参照）。なお、この変形の進行に伴い縦スリットＴｓの幅は次第に広がり、最終的には杭本体部の先端２３（屈曲部位）において、図４に示したように、最大の広がりとなって開く設定とされている。なお、六角ボルト５０が空転するまでねじ締めしたときにおける、この「Ｖ」字の先後方向の角度α（図４−Ｂ参照）は、耐沈降性や耐引抜性等を考慮して適宜のものとすればよいが、本例では、その角度αが、約９０度となるように設定されている。すなわち、この角度αが得られるように、ネジ締めにおけるストロークが設定され、これに基づいてネジ長（雄ネジ５７の長さＬ１）を設定すればよい。   Thus, in the above screw structure, the hexagon bolt 50 is compressed (screwed) through the head 53 so that the front-rear portion of the front end side member 60 and the rear end side member 40 is tightened. Thus, if the distance between the front and rear is reduced, the four walls 25 and 35 in the circumferential direction between the front and rear according to the compression state are the portions closer to the front end side member 60 and the rear end side member 40. With the slits Ys1 and Ys3 of the offset part as the base point, the bent part that is the boundary part, that is, the part of the slit Ys2 provided at the tip 23 of the pile body part (the boundary part between the pile body part 20 and the tapered part 30). Is formed so as to be deformed in a shape of projecting (extending) in a laterally “V” shape with a top (see FIGS. 4A and 4B). As the deformation progresses, the width of the longitudinal slit Ts gradually increases, and finally, at the tip 23 (bent portion) of the pile body, as shown in FIG. Has been. In addition, the angle α (see FIG. 4-B) of the “V” shape when the hexagon bolt 50 is screwed until idling is appropriate in consideration of sedimentation resistance, pullout resistance, and the like. In this example, the angle α is set to be approximately 90 degrees. That is, the stroke in screw tightening is set so that this angle α is obtained, and the screw length (the length L1 of the male screw 57) may be set based on the stroke.

このような本例の基礎杭１００においては、これを従来の単純杭と同様に地盤中（地中）に打ち込み、その上端部を適度に地面上に突出させる。そして、その打ち込み後は、杭本体部２０の後端側（上端）の開口から、例えば、電動式インパクトレンチ等のねじ込み工具（図示せず）を挿入し、そのレンチをなす軸部の先端（ボックス状の嵌合部）を六角ボルト５０の頭部５３に嵌合させてねじ締めをする。すると、先端側部材６０と、後端側部材４０との先後間の間隔が小さくなり、その先後の各壁２５，３５が先後（図示上下）に圧縮される。これにより、周方向において、コーナで分割された４つの各壁２５、３５は、基礎杭１００自体の周方向において、土圧に抗して、図４−Ａ（図４の左図）に示したように、外側に突出するか、張り出す形で変形（塑性変形）し、ねじ締めを進行することで、その変形が次第に大きくなる。そして、ボルト５０における雄ネジ５７に連なるその後方の軸部５４ａの外径が、雄ネジ５７の谷径以下とされているため、最終的に、雄ネジ５７はナット６５のネジ（雌ネジ）から離脱して空転し、図４−Ｂ（図４の右図）に示したように所定の変形（壁２５，３５が角度αの「Ｖ」字状の変形）となってその変形が止まる。   In the foundation pile 100 of this example, this is driven into the ground (underground) in the same manner as the conventional simple pile, and its upper end portion is appropriately projected on the ground. Then, after the driving, for example, a screwing tool (not shown) such as an electric impact wrench is inserted from the opening on the rear end side (upper end) of the pile main body portion 20, and the tip end of the shaft portion forming the wrench ( The box-shaped fitting portion) is fitted to the head 53 of the hexagon bolt 50 and screwed. Then, the space | interval between the front and back of the front end side member 60 and the rear end side member 40 becomes small, and each wall 25 and 35 of the front and rear is compressed back and forth (illustrated up and down). Thereby, in the circumferential direction, each of the four walls 25 and 35 divided by the corners is shown in FIG. 4-A (the left figure of FIG. 4) against the earth pressure in the circumferential direction of the foundation pile 100 itself. As described above, the deformation gradually increases by projecting outward or deforming in a protruding manner (plastic deformation) and proceeding with screw tightening. Then, since the outer diameter of the rear shaft portion 54a connected to the male screw 57 in the bolt 50 is equal to or less than the valley diameter of the male screw 57, the male screw 57 is finally a screw (female screw) of the nut 65. As shown in FIG. 4-B (the right diagram in FIG. 4), the vehicle is slipped and becomes a predetermined deformation (the walls 25 and 35 are deformed in a “V” shape with an angle α), and the deformation stops. .

かくして本例の基礎杭１００においては、その打ち込み後に、このねじ締めを行うことで、作業者に関係なく一定の変形が得られることになるから、耐沈降性や耐引抜性に優れるうえに、バラツキのない安定した基礎杭１００となすことができる。とくに、本例では、四角パイプであり、その周方向における４つの壁において同様の変形が得られるため、これを先端から見たときは、図５に示したように、変形が周囲において均等に突出したものとなる。このように、本例の基礎杭１００では、地盤への打ち込みは、従来の単純杭と同様に簡易に行うことができる。その上に、打ち込み後は、上記したようなネジ構造により、特殊の工具を要することもなく、そのねじ締めを行うだけで耐沈降性や耐引抜性を高めることができる。よって、施工現場等に関係なく、簡易に耐沈降性や耐引抜性にも優れる基礎杭１００が得られる。そしてこの施工後においては、基礎杭１００の上部に設けた工作物の固定手段等の取付穴（図示せず）などを用いて、所望とする架台等を組付け、或いは工作物を設置することができ、その安定した施工を得ることができる。   Thus, in the foundation pile 100 of this example, by performing this screw tightening after the driving, a certain deformation can be obtained regardless of the operator. A stable foundation pile 100 without variations can be obtained. In particular, in this example, it is a square pipe, and the same deformation can be obtained in the four walls in the circumferential direction. Therefore, when viewed from the tip, as shown in FIG. It will be protruding. Thus, in the foundation pile 100 of this example, the driving into the ground can be easily performed as in the conventional simple pile. In addition, after the driving, the above-described screw structure does not require a special tool, and it is possible to improve the settling resistance and the pullout resistance only by tightening the screw. Therefore, the foundation pile 100 which is easily excellent in sedimentation resistance and pull-out resistance can be obtained regardless of the construction site. And after this construction, a desired mount or the like is assembled using a mounting hole (not shown) such as a workpiece fixing means provided on the upper portion of the foundation pile 100, or a workpiece is installed. And stable construction can be obtained.

また、本例の基礎杭１００においては、その打ち込み過程では、先細り部３０の先端等を介して先端側部材６０が後方に押圧される。これにより、先端側部材６０と後端側部材４０との先後間における先細り部３０と杭本体部２０とをなす、上記変形対象パイプ部位２１の壁２５，３５が先後方向に圧縮力を受ける。しかし、ボルト５０に上記したような係合部材７０が設けられているため、その圧縮力をボルト５０の軸部によっても受圧することができる。これにより、その壁２５，３５が低強度であるためにその圧縮力に抗することができず、その打ち込み過程において上記した変形を起こしてしまうことを有効に防止できる。すなわち、本例の基礎杭において、壁が低強度で、係合部材７０を設けてない場合には、図６に示したように、基礎杭を地盤Ｇに打ち込む際、又はその打ち込み過程で、後端側部材４０に対しボルト５０が後退してしまい、壁２５，３５が変形してしまうおそれがある。これに対し、本例では、ボルト５０自体もその打ち込みに起因する圧縮力を受け持つことができるから、そのような変形の発生防止に有効である。これにより、地盤が高強度であるような場合に極めて効果的である。すなわち、上記変形対象パイプ部位２１の壁の厚さが薄く、或いは、それが低強度でも、ボルト５０自体が高強度であれば、打ち込み過程での前記変形を招くことなく、打ち込み後におけるねじ締めにより、壁２５，３５に所望とする変形を容易に得ることができるから、その壁に設ける変形容易手段の簡略化を図ることもできる。よって、その変形のための作業効率の向上も図ることができる。   Moreover, in the foundation pile 100 of this example, in the driving | running process, the front end side member 60 is pressed back via the front end of the taper part 30, etc. Thereby, the walls 25 and 35 of the pipe part 21 to be deformed, which form the tapered portion 30 and the pile main body portion 20 between the front and rear sides of the front end side member 60 and the rear end side member 40, receive a compressive force in the front and rear direction. However, since the engaging member 70 as described above is provided on the bolt 50, the compressive force can be received by the shaft portion of the bolt 50. Thereby, since the walls 25 and 35 have low strength, they cannot resist the compressive force, and it is possible to effectively prevent the above-described deformation from occurring in the driving process. That is, in the foundation pile of this example, when the wall has low strength and the engagement member 70 is not provided, as shown in FIG. 6, when the foundation pile is driven into the ground G, or in the driving process thereof, There is a possibility that the bolts 50 are retracted with respect to the rear end side member 40 and the walls 25 and 35 are deformed. On the other hand, in this example, the bolt 50 itself can also take a compressive force resulting from the driving thereof, which is effective in preventing such deformation. This is extremely effective when the ground is high strength. In other words, if the wall of the pipe part 21 to be deformed is thin or if the bolt 50 itself has a high strength even if it has a low strength, the screw tightening after driving is not caused without causing the deformation in the driving process. Thus, since the desired deformation of the walls 25 and 35 can be easily obtained, the deformation easy means provided on the walls can be simplified. Therefore, the work efficiency for the deformation can be improved.

なお、地盤が軟弱でなく、比較的強度があるような場合には、ねじ締めが空転に至る前に、そのねじ締めを停止してもよい。すなわち、適度の変形が得られた状態で、その変形を止めてもよい。また、本例では、このような変形作業の終了後に、基礎杭１００の後端（上端）から、セメントミルク等のグラウト材を、適量、その内側に流し込み、注入するとよい。この場合、本例では、後端側部材４０に開口４４を設けている（図２のＳ１−Ｓ１、Ｓ２−Ｓ２断面参照）ため、変形後の先端側部材６０と、後端側部材４０との先後間の空間に、グラウト材を注入できる。これにより、その固結後においては、変形後の基礎杭１００の強度や、その空間内部の耐食性のアップも図られる。   When the ground is not soft and has a relatively strong strength, the screw tightening may be stopped before the screw tightening is idle. That is, the deformation may be stopped in a state where an appropriate deformation is obtained. Moreover, in this example, after completion | finish of such a deformation | transformation work, it is good to pour and inject | pour a suitable amount of grout materials, such as cement milk, from the rear end (upper end) of the foundation pile 100 inside. In this case, since the opening 44 is provided in the rear end side member 40 in this example (refer to S1-S1 and S2-S2 cross sections in FIG. 2), the front end side member 60 after deformation, the rear end side member 40, and Grout material can be injected into the space between the front and rear. Thereby, after the consolidation, the strength of the foundation pile 100 after deformation and the corrosion resistance inside the space can be improved.

上記例では、変形容易手段として、上記先後間における、先細り部３０と杭本体部２０とをなすパイプの壁２５，３５のうち、そのコーナにおいて上下に連なるようにスリットＴｓが設けられており、しかも、上記したように、その壁の先後の各部位では横方向（周方向）に延びるスリットＹｓ１，Ｙｓ２，Ｙｓ３も設けられている。このため、コーナに上下に連なるように設けられたスリットＴｓに挟まれる各壁（上下の平板部分）２５、３５ごと、上記境界部位（杭本体部の先端２３）を屈曲点として、外側に突出するか、張出す形で容易に変形させることができる。なお、上記の変形の難易は、先端側部材６０と、後端側部材４０との先後間における先細り部３０と杭本体部２０のなす壁２５，３５の肉厚や、その先後間の壁の先後長、幅、さらには材質等に基づく強度、そして、打ち込んだ地盤における基礎杭１００に対する土圧等によって異なる。このため、これらの難易を考慮し、適度のトルクで上記ねじ締めを行うことのみで、その変形が得られるように、打ち込みをする現場の地盤（土壌）強度、軟弱性等を考慮して、変形容易手段を設けるようにすればよい。   In the above example, as the means for easily deforming, the slits Ts are provided so as to be continuous at the corner of the wall 25, 35 of the pipe forming the tapered portion 30 and the pile main body portion 20 between the front and rear, In addition, as described above, slits Ys1, Ys2, and Ys3 extending in the lateral direction (circumferential direction) are also provided at the front and rear portions of the wall. For this reason, each wall (upper and lower flat plate portions) 25 and 35 sandwiched between slits Ts provided to be vertically connected to the corner protrudes outward with the boundary portion (the tip 23 of the pile body portion) as a bending point. It can be easily deformed in a protruding manner. In addition, the difficulty of said deformation | transformation is the thickness of the walls 25 and 35 which the taper part 30 and the pile main-body part 20 make between the front-and-back between the front end side member 60 and the rear-end side member 40, and the wall between the front and rear. It depends on the strength based on the length and width of the front and rear, the strength based on the material, and the earth pressure on the foundation pile 100 in the driven ground. For this reason, considering these difficulties, considering the ground (soil) strength, softness, etc. of the site to be driven so that the deformation can be obtained only by performing the above screw tightening with an appropriate torque, What is necessary is just to provide a deformation | transformation easy means.

また、上記例においては、変形容易手段として、角パイプのコーナに上下に連なるようにスリットＴｓを設けた場合を例示したが、壁の肉厚次第、或いは、低強度材からなる基礎杭１００であり、ねじ締めによる応力集中等によって容易に壁の破断（周方向の分割）が得られるような場合には、スリットに代えて溝（薄肉部）をコーナ（例えば、壁の外周面の角部）に上下に連なるように設けることとしてもよいし、前記先後間のみ他より肉厚を小さくするなどして、低強度にしてもよい。すなわち、本発明において、上記先後間におけるパイプの周方向に関しては、第１実施例におけるように、当初から分割したものとしてもよいし、ねじ締めによって分割状態が得られるように、適宜の変形容易手段（薄肉部、又は溝）を設けるものとしてもよい。また、上記例では、角パイプのコーナにおいて上下に連なるように変形容易手段を設けたものとして具体化したが、この上下に連なる変形容易手段は、横断面で隣接するコーナ相互に挟まれる壁（平板部）の中間において、上下に連なるように設けてもよいし、これを、上記例におけるようなコーナに設けるものに加えて設けてもよい。   Moreover, in the above example, the case where the slit Ts is provided so as to be connected to the corner of the square pipe as an easy deformation means is illustrated. However, depending on the wall thickness, or the foundation pile 100 made of a low strength material. Yes, when a wall break (circumferential division) can be easily obtained due to stress concentration due to screw tightening, etc., a groove (thin wall portion) is replaced with a corner (for example, a corner of the outer peripheral surface of the wall). ) May be provided so as to be continuous in the vertical direction, or the strength may be reduced by making the thickness smaller than the others only during the first and second periods. That is, in the present invention, the circumferential direction of the pipe between the front and rear may be divided from the beginning as in the first embodiment, or may be appropriately deformed so that a divided state can be obtained by screw tightening. Means (thin wall portion or groove) may be provided. Further, in the above example, the corner pipe of the square pipe is embodied as the means for easily deforming so as to be continuous in the vertical direction. In the middle of the flat plate portion), it may be provided so as to be continuous in the vertical direction, or this may be provided in addition to that provided in the corner as in the above example.

そして、上記例では、横方向に延びる変形容易手段として、横スリットＹｓ１，Ｙｓ２，Ｙｓ３を設けたが、これについても、適宜の変形容易手段（切れ目、薄肉部、又は溝）を設けるものとしてもよい。さらに、壁の肉厚次第、或いは、低強度材からなる基礎杭１００であり、ねじ締めによって容易に、外側に突出するか、張り出すような変形が得られる限り、変形容易手段は適宜の位置、又は部位に設ければよい。すなわち、変形容易手段は、上記ねじ締めにおける圧縮力の作用時に、このような変形が得られるように、適宜の位置に、適宜の形態で設ければよい。なお、上記例では、横向き「Ｖ」字状に変形する場合で説明したが、この変形の形態は、これに限定されるものではなく、外側に突出するか、張り出す（膨らむ）ような変形であればよく、その変形の仕方や量（突出量）も地盤等に応じて適宜のものとなるものであればよい。   In the above example, the horizontal slits Ys1, Ys2, and Ys3 are provided as the easily deformable means extending in the lateral direction. However, it is also possible to provide appropriate easy deformable means (cuts, thin portions, or grooves). Good. Furthermore, depending on the wall thickness or the foundation pile 100 made of a low-strength material, as long as deformation that protrudes outward or protrudes easily can be obtained by screw tightening, the deformable means is in an appropriate position. Or it may be provided at the site. In other words, the easy-to-deform means may be provided in an appropriate form at an appropriate position so that such deformation is obtained when the compression force is applied in the screw tightening. In the above example, the case where the shape is deformed in a horizontal “V” shape has been described. However, the form of the deformation is not limited to this, and the shape protrudes outward or bulges (swells). Any method may be used as long as the deformation method and amount (projection amount) are appropriate depending on the ground and the like.

さらに、上記例では、杭本体部２０は、横断面が先後に一定の角パイプ構造を有しており、先細り部３０は、この角パイプの先端を基端とする角錐のパイプ構造で形成されたものとして具体化したが、本発明の基礎杭１００は、横断面が他の多角形のものとしても具体化できる。また、杭本体部２０は、横断面が先後に一定の円パイプ構造を有しており、先細り部３０は、円すいパイプ構造のものとしても具体化できる。このように、本発明の基礎杭１００は、パイプ状のものにおいて広く適用できる。   Furthermore, in the above example, the pile main body portion 20 has a square pipe structure with a constant cross section before and after, and the tapered portion 30 is formed with a pyramid pipe structure with the distal end of the square pipe as a base end. However, the foundation pile 100 of the present invention can be embodied as having a polygonal cross section. Moreover, the pile main-body part 20 has a circular pipe structure where a cross section is constant ahead, and the taper part 30 can be embodied as a conical pipe structure. Thus, the foundation pile 100 of this invention is widely applicable in a pipe-shaped thing.

次に第２実施例の基礎杭２００について図７、図８に基づいて説明する。ただし、本例の基礎杭２００は、上記第１実施例における先細り部３０のうち、それに溶接されている先端側部材６０より先方に位置する部位（キャップ状部位）３７を除去した構成のものである。このように本例では、上記第１実施例における先細り部３０のうち、先方の尖った部位を有する部位（キャップ状部位）３７がないもの、すなわち、四角錐状の先細り部３０を先端側部材６０より先方において、その頭を切った四角錐台形状として、先端側部材６０の先方においてナット６５を露出させると共に、ボルト５０の軸部５４の先端５８を露出させるようにした点のみが、上記第１実施例と相違するだけである。このように、実質的に、先細り部３０を、第１実施例よりも短めに形成し、先端側部材６０をその先細り部３０の先端に備えるものとした点のみが前例と相違するだけであるから、その相違点を中心として説明し、同一又は対応する部位には、同一の符号を付すに止める。   Next, the foundation pile 200 of 2nd Example is demonstrated based on FIG. 7, FIG. However, the foundation pile 200 of the present example has a configuration in which a portion (cap-shaped portion) 37 positioned ahead of the distal end side member 60 welded to the tapered portion 30 in the first embodiment is removed. is there. As described above, in this example, the tapered portion 30 in the first embodiment does not have the portion (cap-shaped portion) 37 having the pointed tip, that is, the quadrangular pyramid tapered portion 30 is the tip side member. Only the point that the nut 65 is exposed at the tip of the tip side member 60 and the tip 58 of the shaft portion 54 of the bolt 50 is exposed at the tip of the tip side member 60 as a truncated pyramid shape at the tip of the head 60. The only difference is the first embodiment. As described above, the tapered portion 30 is substantially formed shorter than the first embodiment, and only the point that the distal end side member 60 is provided at the distal end of the tapered portion 30 is different from the previous example. Therefore, the difference will be mainly described, and the same or corresponding parts will be denoted by the same reference numerals.

すなわち、上記第１実施例では、先細り部３０にキャップ状部位３７があるため、先端側部材６０を形成するナット６５、及びボルト５０の軸部５４の先端を包囲し、それらを保護する作用と、先細り部３０の先端形状を一定に保持できる効果が得られる。一方、このような作用、効果を得るため、キャップ状部位３７を設ける場合には、その部品や取付工程（溶接工程）が増えるなど、製造工程のみならず、基礎杭２００の構造もその分、複雑化する。これに対して、本第２実施例では、そのようなキャップ状部位３７がない分、製造工程のみならず、構造の単純化が図られる。しかも、上記第１実施例では、ねじ締めにおいてボルト５０の軸部５４の先端を先細り部３０内に収まるようにする必要があるから、先細り部３０の先細りを急先細りとすることができないため、先細り部３０の長さが長くなりがちとなるが、本第２実施例ではかかる問題もない。なお、この第２実施例のものでは、先細り部３０は、その先端が地盤中に打ち込まれ易くなるように、その先細り具合を設定する（テーパ角を付ける）か、その先端側部材６０をなすナット６５が、地盤中に打ち込まれ易くなるように、ナット自体を先後に長くし、かつ、先細り状にしておくなど、杭の先端に相応しい大きさ、形状、構造としておくとよい。また、この場合、ボルト５０の先端５８をネジ構造の当初から突出させておく場合には、その先端５８も図７中に示したように、適度に先細り状にしておくのがよい。   That is, in the first embodiment, since the tapered portion 30 has the cap-shaped portion 37, the nut 65 forming the tip side member 60 and the tip of the shaft portion 54 of the bolt 50 are surrounded and protected. The effect that the tip shape of the tapered portion 30 can be kept constant can be obtained. On the other hand, in order to obtain such actions and effects, when the cap-shaped portion 37 is provided, the number of parts and attachment processes (welding processes) are increased. To be complicated. On the other hand, in the second embodiment, since there is no such cap-shaped portion 37, not only the manufacturing process but also the structure can be simplified. Moreover, in the first embodiment, since it is necessary to fit the tip of the shaft portion 54 of the bolt 50 in the taper portion 30 in screw tightening, the taper of the taper portion 30 cannot be sharply tapered. Although the length of the tapered portion 30 tends to be long, there is no such problem in the second embodiment. In the second embodiment, the tapered portion 30 is set to have a tapered state (with a taper angle) or to form the distal end side member 60 so that the distal end thereof is easily driven into the ground. In order to make the nut 65 easier to be driven into the ground, the nut itself may be made longer and tapered, and the size, shape and structure suitable for the tip of the pile may be used. Further, in this case, when the front end 58 of the bolt 50 is protruded from the beginning of the screw structure, the front end 58 should be appropriately tapered as shown in FIG.

なお、第２実施例の基礎杭２００についても、第１実施例の基礎杭１００と同様に施工することができ、同様の効果が得られることは明らかである。すなわち、この基礎杭２００を地盤中に打ち込んだ後は、図８−Ａ、Ｂに示したように、第１実施例の基礎杭１００と同様にねじ締めを行うことで、同様の作用効果が得られる他、その構造上の差による前記したような基礎杭自体のメリットもある。   It is obvious that the foundation pile 200 of the second embodiment can be constructed in the same manner as the foundation pile 100 of the first embodiment, and the same effect can be obtained. That is, after driving this foundation pile 200 into the ground, as shown in FIGS. 8A and 8B, the same operation and effect can be obtained by screwing in the same manner as the foundation pile 100 of the first embodiment. In addition to the above, there is also a merit of the foundation pile itself as described above due to the difference in structure.

本発明は、上記した各実施例のものに限定されるものではなく、本発明の要旨を逸脱しない範囲において、適宜に変更して具体化できる。上記例では、上記先後間において、周方向に分割されたパイプの壁を、先後（上下）において、外方に横向き「Ｖ」字形に変形させるものとしたが、本発明においては、前記先端側部材と前記後端側部材とがその先後間において圧縮されて該先後間の間隔が小さくされたとき、該先後間における前記先細り部と前記杭本体部とをなす壁が、基礎杭自体の周方向において分割された状態で、外側に突出するか、外側に張出す形で変形することができれば十分である。したがって、上記もしたように、このパイプの壁は、先後（上下）において、外方に円弧状に膨らむものであってもよい。そして、該先後間の壁に設ける変形容易手段は、前記先後間の間隔を小さくしたとき、このような変形が得られるものでありさえすればよい。   The present invention is not limited to the above-described embodiments, and can be embodied with appropriate modifications without departing from the spirit of the present invention. In the above example, the wall of the pipe divided in the circumferential direction between the front and rear is deformed outwardly in a laterally “V” shape in the front and rear (up and down). When the member and the rear end side member are compressed between the front and rear and the distance between the front and rear is reduced, the wall that forms the tapered portion and the pile body portion between the front and rear is the circumference of the foundation pile itself. It suffices if it can be deformed so as to protrude outward or project outward while being divided in the direction. Therefore, as described above, the wall of the pipe may bulge outwardly in a circular arc shape at the front and rear (up and down). And the deformation | transformation easy means provided in this wall between the front and back should just be such a deformation | transformation, when the space | interval between the said front and back is made small.

また、後方移動防止手段として、上記例では、後端側部材４０の先端向き面４５、又はその先端向き面４５における貫通穴４３の周縁に係合するように、ボルト５０の軸部に設けられた係合部材７０としたが、本発明における後方移動防止手段はこれに限られるものではない。すなわち、後方移動防止手段は、基礎杭自体が地盤に打ち込まれることで、先端側部材が後方に押圧されて前記先後間における前記先細り部と前記杭本体部とをなす壁が先後方向に圧縮力を受ける際に、該圧縮力が前記ボルトの軸部にも軸力として作用するように、すなわち、該ボルトが前記後端側部材に対し後方へ移動するのを防止することができる手段でありさえすればよく、したがって、その移動防止が図られる限り、適宜に変更して具体化できる。   In the above example, the rearward movement preventing means is provided at the shaft portion of the bolt 50 so as to engage with the front end facing surface 45 of the rear end side member 40 or the peripheral edge of the through hole 43 in the front end facing surface 45. However, the backward movement preventing means in the present invention is not limited to this. That is, the backward movement preventing means is such that the foundation pile itself is driven into the ground, the tip side member is pressed backward, and the wall formed between the tapered portion and the pile main body portion between the front and rear is compressed in the front-rear direction. Is a means capable of preventing the bolt from moving backward with respect to the rear end side member so that the compressive force acts as an axial force on the shaft portion of the bolt when receiving the force. Therefore, as long as the movement can be prevented, it can be appropriately changed and embodied.

図９は、前記した第２実施例において、後方移動防止手段のみを変更した別例を示したものである。すなわち、図９に示した基礎杭３００では、前例におけるボルトよりも長い六角ボルト５０を用い、その頭部５３より先端側の軸部５４に、別途、例えば、リング状の大径部材７３を溶接、ピン止め等により固定し、このボルト５０のネジ締めによって、この大径部材７３と、先端側部材６０におけるナット６５との間で、後端側部材４０と先端側部材６０との先後間を圧縮し、その間の間隔を小さくするネジ構造とされている。そして、その大径部材７３の後端向き面（図示上面）７５に、ボルト５０のネジ締め（回転）に支障が出ないように適度の空隙が確保されるようにして、移動規制部材８０が設けられており、ボルト５０が後方に移動しないようにされている。この移動規制部材８０は、大径部材７３の後端向き面（図示上面）７５の若干、後方において杭本体部２０の対向する壁２０にて両端支持状態で固定されるように配置されている。このように本例では、ボルト５０が後端側部材４０に対し後方へ移動するのを防止する後方移動防止手段が、後端側部材４０の後方にてボルト５０に設けられた大径部材７３の後端向き面７５が、杭本体部２０に設けられた移動規制部材８０に係合することで構成されている。   FIG. 9 shows another example in which only the backward movement preventing means is changed in the second embodiment. That is, in the foundation pile 300 shown in FIG. 9, for example, a ring-shaped large-diameter member 73 is welded to the shaft portion 54 on the tip side from the head 53 separately, using a hexagon bolt 50 longer than the bolt in the previous example. By fixing the bolt 50 with a bolt or the like, the front-rear portion between the rear end side member 40 and the front end side member 60 is fixed between the large diameter member 73 and the nut 65 of the front end side member 60 by tightening the bolt 50. It is a screw structure that compresses and reduces the interval therebetween. The movement restricting member 80 is secured to the rear-end-facing surface (the upper surface in the drawing) 75 of the large-diameter member 73 so that an appropriate gap is secured so as not to hinder the screw tightening (rotation) of the bolt 50. It is provided so that the bolt 50 does not move backward. The movement restricting member 80 is disposed so as to be fixed in a state where both ends are supported by the facing wall 20 of the pile body 20 at the rear of the rear end-facing surface (upper surface in the drawing) 75 of the large-diameter member 73. . Thus, in this example, the rearward movement preventing means for preventing the bolt 50 from moving backward relative to the rear end side member 40 is a large diameter member 73 provided on the bolt 50 behind the rear end side member 40. The rear end facing surface 75 is configured by engaging with a movement restricting member 80 provided in the pile main body portion 20.

このような別例においても、基礎杭３００を地盤に打込む等により先端側部材６０が後方に押圧され、後端側部材４０と先端側部材６０との先後間における先細り部６０と杭本体部２０とをなす壁２５，３５が先後方向に圧縮力を受ける際には、その圧縮力は、ボルト５０の軸部５４にも軸力として作用するから、上記したのと同様の効果が得られることは明らかである。そして、その打ち込み後には、上記例と同様にボルト５０の頭部５３を回転させて、ネジ締めすることにより、所望とする変形が得られる。このように、本発明における後方移動防止手段は、適宜の手段に変更して具体化できる。なお、本例では、ボルト５０の軸部５４に設けた大径部材７３が、杭本体部２０に設けた移動規制部材８０に係合することで、ボルト５０の後方への移動を防止する後方移動防止手段をなしている。また、本例では、ボルトの頭部５３が後端側部材４０よりも上方に位置することになるため、ねじ込み工具の嵌合部をその頭部５３に嵌合しやすくなる。   Also in such another example, the front end side member 60 is pressed backward by driving the foundation pile 300 into the ground, and the tapered portion 60 and the pile main body portion between the front end and the rear end side member 40 and the front end side member 60 are rearranged. When the walls 25 and 35 forming 20 receive a compressive force in the front-rear direction, the compressive force acts on the shaft portion 54 of the bolt 50 as an axial force, so that the same effect as described above can be obtained. It is clear. Then, after the driving, the desired deformation can be obtained by rotating the head 53 of the bolt 50 and tightening the screw as in the above example. Thus, the backward movement preventing means in the present invention can be embodied by changing to an appropriate means. In this example, the large-diameter member 73 provided on the shaft portion 54 of the bolt 50 engages with the movement restricting member 80 provided on the pile main body portion 20 to prevent the bolt 50 from moving backward. It is a means for preventing movement. Moreover, in this example, since the head 53 of the bolt is positioned above the rear end side member 40, the fitting portion of the screwing tool can be easily fitted to the head 53.

また、本発明におけるネジ構造は、上記各実施例において例示したものに限定されるものではない。前記先端側部材と前記後端側部材とが、前記杭本体部内に後端側の開口から挿入される工具によるねじ締めによって、前記先後間の間隔を小さくできるネジ構造であればよい。なお、パイプ状の杭本体部は、通常は、鋼製とされ、そのパイプの径（太さ）、壁の肉厚、長さ等の仕様は、基礎杭として支持すべき架台等の重量や使用する地盤の軟弱性に応じて適宜に選択すればよい。また、先細り部の先細り具合（テーパ）は、基礎杭の太さや、地盤の強度等に応じて適宜に設定すればよい。さらに、基礎杭は、打ち込みに支障がなく、上記ボルト締めにおいて、適度の締付け力で上記した変形（塑性変形）が得られるものから選択すればよく、その材質が限定されるものではないのは上記したとおりである。   Further, the screw structure in the present invention is not limited to those illustrated in the above embodiments. The front end side member and the rear end side member may have a screw structure that can reduce the distance between the front and rear by screwing with a tool inserted from the rear end side opening into the pile main body. The pipe-shaped pile body is usually made of steel, and the specifications of the pipe diameter (thickness), wall thickness, length, etc. What is necessary is just to select suitably according to the softness of the ground to be used. Moreover, what is necessary is just to set the taper condition (taper) of a taper part suitably according to the thickness of a foundation pile, the intensity | strength of a ground, etc. Furthermore, the foundation pile has no hindrance to driving, and in the above bolt tightening, it may be selected from those that can obtain the above deformation (plastic deformation) with an appropriate tightening force, and the material is not limited. As described above.

２０ パイプ状の杭本体部の先端
２３ 杭本体部の先端
２５，３５ 先細り部と杭本体部とをなす壁
３０ 先細り部
４０ 後端側部材
４３ 後端側部材の貫通穴
４４ 後端側部材における固結剤の注入用の開口
４５ 後端側部材の先端向き面
５０ ボルト
５３ ボルトの頭部
５４ ボルトの軸部
５７ ボルトの雄ネジ
６０ 先端側部材
６５ ナット（先端側部材）
７０ 係合部材（後方移動防止手段）
７３ 大径部材（後方移動防止手段）
８０ 移動規制部材（後方移動防止手段）
１００，２００，３００ 基礎杭
Ｔｓ，Ｙｓ１，Ｙｓ２，Ｙｓ３ スリット（変形容易手段） 20 The tip of the pipe-shaped pile body 23 The tip of the pile body
25, 35 Wall which forms tapered part and pile body part 30 Tapered part 40 Rear end side member 43 Through hole in rear end side member 44 Opening for injection of caking agent in rear end side member 45 Front end of rear end side member Orientation surface 50 Bolt 53 Bolt head 54 Bolt shaft 57 Bolt male screw 60 Tip side member 65 Nut (tip side member)
70 Engagement member (backward movement prevention means)
73 Large-diameter member (backward movement prevention means)
80 Movement restriction member (backward movement prevention means)
100, 200, 300 Foundation pile Ts, Ys1, Ys2, Ys3 Slit (easy deformation means)

Claims (7)

パイプ状の杭本体部の先端から先方に先細りパイプ状に形成された先細り部を備えてなる基礎杭において、
前記杭本体部内であって該杭本体部の先端より後方には後端側部材を備えており、前記先細り部内であって該杭本体部の先端より先方又は該先細り部の先端には先端側部材を備えており、
該先端側部材と前記後端側部材とがその先後間において圧縮されて該先後間の間隔が小さくされたときに、該先後間における前記先細り部と前記杭本体部とをなす壁が、基礎杭自体の周方向において分割された状態で、外側に突出するか、張出す形で変形するように、該先後間の壁には変形容易手段が設けられており、
前記後端側部材には、ボルトの軸部が挿通可能の貫通穴が設けられている一方、
前記先端側部材には、前記ボルトの軸部に設けられた雄ネジが螺合する雌ネジが設けられており、
前記ボルトが、その軸部を前記貫通穴に挿通されて、前記雄ネジが前記雌ネジにねじ込まれ、このねじ込み状態にある該ボルトが、前記杭本体部内にその後端側の開口から挿入される工具によってねじ締めされることによって、前記先後間の間隔が小さくなるようなねじ構造を有しており、
しかも、基礎杭自体が地盤に打ち込まれることによって、前記先端側部材が後方に押圧されて前記先後間における前記先細り部と前記杭本体部とをなす壁が先後方向に圧縮力を受ける際に、該圧縮力が前記ボルトの軸部にも軸力として作用するように、該ボルトが前記後端側部材に対し後方へ移動するのを防止する後方移動防止手段を備えていることを特徴とする基礎杭。 In a foundation pile comprising a tapered portion formed into a pipe shape tapered from the tip of the pipe- shaped pile main body part,
A rear end side member is provided in the pile main body portion and behind the front end of the pile main body portion, and in the tapered portion and ahead of the front end of the pile main body portion or on the front end of the tapered portion. With components,
When the front end side member and the rear end side member are compressed between the front and rear and the distance between the front and rear is reduced, the wall that forms the tapered portion and the pile main body portion between the front and rear is a foundation. In a state of being divided in the circumferential direction of the pile itself, the wall between the front and rear is provided with an easy-to-transform means so as to project outward or deform in a protruding form,
While the rear end side member is provided with a through hole through which a shaft portion of a bolt can be inserted,
The distal end side member is provided with a female screw into which a male screw provided on a shaft portion of the bolt is screwed.
The bolt is inserted through the through hole through the shaft, the male screw is screwed into the female screw, and the bolt in this screwed state is inserted into the pile main body from the opening on the rear end side. It has a screw structure such that the space between the front and rear is reduced by being screwed by a tool,
Moreover, when the foundation pile itself is driven into the ground, the tip side member is pressed backward, and the wall that forms the tapered portion and the pile main body portion between the front and rear receives a compressive force in the front-rear direction. Backward movement preventing means for preventing the bolt from moving backward relative to the rear end side member is provided so that the compressive force also acts on the shaft portion of the bolt as an axial force. Foundation pile. 前記後方移動防止手段として、前記後端側部材の先端向き面又は該先端向き面における前記貫通穴の周縁に係合する係合部材が、前記ボルトの軸部に設けられていることを特徴とする請求項１に記載の基礎杭。   As the backward movement preventing means, an engagement member that engages with a front end facing surface of the rear end side member or a peripheral edge of the through hole in the front end facing surface is provided on a shaft portion of the bolt. The foundation pile according to claim 1. 前記変形容易手段として、基礎杭自体の周方向に間隔をおいて、前記先後間における前記先細り部と前記杭本体部とをなす壁に、上下に連なって又は連ならずに延びるスリット又は溝が設けられていることを特徴とする請求項１又は２のいずれか１項に記載の基礎杭。   As the easily deformable means, there is a slit or groove extending vertically or not on the wall that forms the tapered portion and the pile main body portion between the front and rear sides with an interval in the circumferential direction of the foundation pile itself. The foundation pile according to claim 1, wherein the foundation pile is provided. 前記杭本体部は、横断面が先後に一定の角パイプ構造を有しており、前記先細り部は、この角パイプの先端を基端とする角錐状又は角錐台状のパイプ構造に形成されており、
前記変形容易手段として、前記先後間における前記先細り部と前記杭本体部とをなす壁のうち、横断面におけるコーナ又は該コーナ近傍に、上下に連なって又は連ならずに延びるスリット又は溝が設けられていることを特徴とする請求項１又は２のいずれか１項に記載の基礎杭。 The pile body portion has a square pipe structure with a constant cross section before and after, the tapered portion is formed into a pyramid-shaped or truncated pyramid-shaped pipe structure with the tip of the square pipe as a base end. And
As the deformation facilitating means, a slit or a groove extending in the vertical direction or not in the vicinity of the corner in the cross section or in the vicinity of the corner is provided in the wall forming the tapered portion and the pile main body portion between the front and rear. The foundation pile according to claim 1, wherein the foundation pile is formed. 前記変形容易手段として、前記上下に連なって又は連ならずに延びるスリット又は溝とは別に、
前記杭本体部と前記先細り部との境界部位、前記先後間のうちの前記先端側部材寄り部位、及び前記後端側部材寄り部位の各壁の部位に、基礎杭自体の周方向に延びるスリット又は溝が設けられていることを特徴とする請求項３又は４のいずれか１項に記載の基礎杭。 As the easily deformable means, apart from the slit or groove extending vertically or without being continuous,
A slit extending in the circumferential direction of the foundation pile itself at a boundary portion between the pile main body portion and the tapered portion, a portion closer to the front end side member between the front and rear portions, and a portion closer to the rear end side member. Or the foundation pile of any one of Claim 3 or 4 provided with the groove | channel. 前記先後間の間隔が、前記ねじ締めによって小さくなり、該間隔が所定量になったときに、そのねじ締めにおける前記ボルトの回転が空転となるように、前記雄ネジのネジ長と、該雄ネジに連なる前記軸部の外径とが設定されていることを特徴とする請求項１〜５のいずれか１項に記載の基礎杭。   The screw length of the male screw and the male screw are such that when the screw tightening reduces the distance between the front and rear, and when the distance reaches a predetermined amount, rotation of the bolt during screw tightening is idle. The foundation pile according to any one of claims 1 to 5, wherein an outer diameter of the shaft portion connected to the screw is set. 前記後端側部材には、前記先端側部材と前記後端側部材との先後間の空間に、前記杭本体部内の後方から固結剤を注入可能の開口が設けられていることを特徴とする請求項１〜６のいずれか１項に記載の基礎杭。   The rear end side member is provided with an opening through which a caking agent can be injected from the rear in the pile main body in a space between the front end and the rear end side member. The foundation pile according to any one of claims 1 to 6.
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