JP2000170161A - Screw-in pile and driving method therefor - Google Patents
Screw-in pile and driving method thereforInfo
- Publication number
- JP2000170161A JP2000170161A JP10346692A JP34669298A JP2000170161A JP 2000170161 A JP2000170161 A JP 2000170161A JP 10346692 A JP10346692 A JP 10346692A JP 34669298 A JP34669298 A JP 34669298A JP 2000170161 A JP2000170161 A JP 2000170161A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- auger
- tip
- pile body
- ground
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Piles And Underground Anchors (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、ねじ込み杭の施工
方法及びこれに使用するねじ込み杭に係り、さらに詳し
くは、鋼管杭やコンクリート杭の如き既成杭の先端部又
はその近傍に取付けた翼を利用し、杭体を回転させるこ
とにより翼のねじ作用によって地中に貫入するようにし
たねじ込み杭の施工方法及びこれに使用するねじ込み杭
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a threaded pile and a threaded pile used in the method, and more particularly, to a wing attached to or near a tip of an existing pile such as a steel pipe pile or a concrete pile. The present invention relates to a method for constructing a threaded pile, which is used to penetrate the ground by screw action of a wing by rotating a pile body, and a threaded pile used for the method.
【０００２】[0002]
【従来の技術】地上に設置した機械によって回転力を与
えることにより、先端部近傍に取付けた翼のねじ作用に
より鋼管杭を埋設する方法は、従来から種々提案されて
おり、その一部は小径の鋼管杭を対象としたものではあ
るが実用化されている。以下、本発明に関連すると思わ
れる従来の技術について説明する。2. Description of the Related Art Various methods have been proposed for burying steel pipe piles by screwing a wing attached near the tip by applying a rotating force by a machine installed on the ground. Although it is intended for steel pipe piles, it has been put to practical use. Hereinafter, a conventional technique which is considered to be related to the present invention will be described.
【０００３】特公平２−６２６４８号公報に記載された
鋼管杭の埋設工法は、鋼管製の杭本体の下端に底板を固
設し、該底板に掘削刃を設けると共に、杭本体の下端部
外周面に杭本体の外径のほぼ２倍強の外径を有する翼幅
の大きな杭ネジ込み用の螺旋翼を、ほぼ一巻きにわたり
突設した鋼管杭を、軟弱地盤にネジ込むように回転させ
ながら地中に押圧し、下端の掘削刃によって杭本体先端
の土砂を掘削軟化させて、杭側面の未掘削土砂中に螺旋
翼を食い込ませて、土の耐力を反力として杭体を回転推
進しつつ、掘削軟化した土砂を杭側面に押出し圧縮し、
無俳土で地中に抗体をネジ込んでゆくようにしたもので
ある（従来技術１）。[0003] In the method of burying steel pipe piles described in Japanese Patent Publication No. 2-62848, a bottom plate is fixed to the lower end of a steel pipe pile body, a digging blade is provided on the bottom plate, and an outer periphery of the lower end of the pile body is provided. A spiral wing for screwing a pile with a large wing width, which has an outer diameter almost twice as large as the outer diameter of the pile body on the surface, is rotated so that a steel pipe pile projecting over almost one turn is screwed into soft ground. While pushing into the ground, the excavation blade at the lower end excavates and softens the earth and sand at the tip of the pile body, and makes the spiral wings bite into the unexcavated earth and sand on the side of the pile. While extruding and softening the excavated softened soil to the side of the pile,
The antibody is screwed into the ground with no soil (prior art 1).
【０００４】また、特開平７−２９２６６６号公報に記
載された鋼管杭は、一枚の長さが半巻きで、外径が杭本
体の１．５〜３倍程度である一対のラセン翼を、鋼管杭
の下端部外周面の同じ高さ位置でラセン方向を同じにし
て互いに相対的に複数枚不連続に固定したものである
（従来技術２）。A steel pipe pile described in Japanese Patent Application Laid-Open No. 7-292666 has a pair of spiral wings, each of which has a length of half a roll and an outer diameter of about 1.5 to 3 times the pile body. A plurality of steel pipe piles are fixed discontinuously relative to each other at the same height position on the outer peripheral surface of the lower end portion of the steel pipe pile with the same helical direction (prior art 2).
【０００５】さらに、特開昭６１−９８８１８号公報に
記載された回転圧入式鋼管杭は、鋼製円筒体の下部に、
上下方向に延長する押込用傾斜前面を有する刃を設ける
と共に、その傾斜前面の下端部から円筒体回転方向の後
方に向って斜めに上昇する傾斜ブレードを固定して環状
のドリルヘッドを構成し、そのドリルヘッドの上端部に
鋼管杭の下端部を取付けたものである（従来技術３）。[0005] Further, a rotary press-fit steel pipe pile described in Japanese Patent Application Laid-Open No. 61-98818 has a structure in which a steel cylinder is provided at a lower portion thereof.
Providing a blade having a pushing inclined front surface extending in the vertical direction, and forming an annular drill head by fixing an inclined blade obliquely rising upward from a lower end portion of the inclined front surface toward the rear in the cylindrical body rotating direction, The lower end of the steel pipe pile is attached to the upper end of the drill head (prior art 3).
【０００６】また、特開平８−２２６１２４号公報に記
載された鋼管杭は、先端近くの外周面に螺旋羽根を備
え、先端より上方の鋼管内側に閉塞を促す開孔リブを設
けることにより、閉塞された土砂と鋼管で支持底部を形
成するようにしたものである（従来技術４）。Further, the steel pipe pile described in Japanese Patent Application Laid-Open No. 8-226124 has a spiral blade on the outer peripheral surface near the tip, and an open rib for promoting closure is provided on the inside of the steel pipe above the tip. The supporting bottom is formed by the earth and sand and the steel pipe (prior art 4).
【０００７】これら従来技術１〜４に示す螺旋翼又は傾
斜ブレードは、施工に際してねじとして機能し、また、
螺旋翼は大きな地盤反力を得るための支持体としての機
能も備えている。[0007] The spiral wings or inclined blades shown in these prior arts 1 to 4 function as screws during construction, and
The spiral wing also has a function as a support for obtaining a large ground reaction force.
【０００８】[0008]
【発明が解決しようとする課題】従来技術１は鋼管先端
が底板で閉塞されているため、比較的大きな先端支持力
を確保することができるが、螺旋翼が受ける地盤反力が
大きいために、回転貫入に要するトルクが非常に大きく
なり、貫入能率が低下する。また、掘削刃により支持層
のような硬い地盤が乱されるため、支持層本来の支持力
を発揮することができず、先端支持力が低下する。In the prior art 1, since the tip of the steel pipe is closed by the bottom plate, a relatively large tip supporting force can be secured. However, since the ground reaction force received by the spiral blade is large, The torque required for rotational penetration becomes very large, and the penetration efficiency decreases. In addition, since the hard ground such as the support layer is disturbed by the excavation blade, the original support force of the support layer cannot be exhibited, and the tip support force decreases.
【０００９】従来技術２は、底板がある場合は、従来技
術１と同じ問題がある。また、底板がない場合でも支持
層本来の支持力が発揮されず、先端支持力は低下する。The prior art 2 has the same problem as the prior art 1 when there is a bottom plate. In addition, even if there is no bottom plate, the original support force of the support layer is not exhibited, and the tip support force is reduced.
【００１０】従来技術３の鋼管杭は、傾斜ブレードの幅
が狭いために、施工時のトルクは小さいが推進力が得ら
れない。また、先端開放型であるため、大きな先端支持
力を確保できない。[0010] In the steel pipe pile of the prior art 3, since the width of the inclined blade is narrow, the torque at the time of construction is small, but no propulsive force is obtained. In addition, since it is an open end type, a large end support force cannot be secured.
【００１１】また、従来技術４の鋼管杭は、先端開放に
よりトルクの低減を行っているが、支持層などの硬い層
の手前で先端部が土砂により閉塞してしまうと、支持層
貫入時に大きなトルクが必要になる。In the steel pipe pile of the prior art 4, the torque is reduced by opening the tip. However, if the tip is blocked by earth and sand before the hard layer such as the support layer, the steel pipe pile has a large size when penetrating the support layer. Requires torque.
【００１２】本発明は、上記の課題を解決するためなさ
れたもので、ねじ込み貫入の能率を向上すると共に、回
転トルクを大幅に低減して強固な地盤まで杭体をねじ込
みにより埋設することができ、併せて翼を利用して大き
な地盤支持力を得ることのできるねじ込み杭の施工方法
及びこれに使用するねじ込み杭を提供することを目的と
するものである。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is possible to improve the efficiency of screw-in penetration, drastically reduce rotational torque, and embed a pile body into a firm ground by screwing. It is another object of the present invention to provide a method for constructing a threaded pile capable of obtaining a large ground support force by using wings, and a threaded pile used for the method.
【００１３】[0013]
【課題を解決するための手段】本発明に係るねじ込み杭
の施工方法は、先端部又は先端部近傍に翼を有する中空
の杭体を地盤中に設置する施工方法であって、前記杭体
内にオーガーを挿入してその先端部を前記杭体の先端部
から突出させ、前記杭体とオーガーに互いに反対方向の
回転力を与えて前記杭体を地盤中にねじ込み、該杭体が
所定の深さに達したときは前記オーガーを引上げるよう
にしたものである。According to the present invention, there is provided a method for constructing a screw-in pile, which comprises placing a hollow pile having wings at the tip or in the vicinity of the tip in the ground. An auger is inserted and its tip protrudes from the tip of the pile, and a rotational force is applied to the pile and the auger in opposite directions to screw the pile into the ground, and the pile has a predetermined depth. When the auger is reached, the auger is pulled up.
【００１４】また、上記のねじ込み杭の施工方法におい
て、オーガーに取付けた土砂止め板により杭体内への土
砂の侵入を抑制し、前記オーガーの先端部より掘削軟化
した土砂を前記杭体の周面に押出して該杭体の周面摩擦
力を上昇させるようにした。さらに、上記のねじ込み杭
の施工方法において、先端部が杭体の先端部より大きく
拡大できるオーガーを使用するようにした。[0014] In the above-described method of constructing a screw-in pile, the intrusion of earth and sand into the pile body is suppressed by a sediment stop plate attached to the auger, and the earth and sand excavated and softened from the tip of the auger is removed from the peripheral surface of the pile body. To increase the peripheral frictional force of the pile. Further, in the above-described method of constructing a screw-in pile, an auger whose tip is larger than the tip of the pile is used.
【００１５】本発明に係るねじ込み杭は、先端部又は先
端部近傍の外周に螺旋状翼又は平板状の複数の鋼製翼が
取付けられて上記の施工方法により施工されたものであ
る。The screw-in pile according to the present invention is constructed by attaching the spiral wings or a plurality of flat plate-like steel wings to the distal end portion or the outer periphery near the distal end portion by the above-described method.
【００１６】[0016]
【発明の実施の形態】［実施の形態１］図１は本発明の
実施の形態１を説明するための模式図である。図におい
て、１は鋼管杭、コンクリート杭の如き中空で円形断面
の既成杭（以下、杭体という）で、先端部外周又はその
近傍には翼１０が設けられている。２０は杭体１内に挿
入されたオーガー、３０は地上に設置されたベースマシ
ンで、互に反対方向に回転する２個の回転軸（外軸と内
軸）を備えたモータ３１が搭載されている。[First Embodiment] FIG. 1 is a schematic diagram for explaining a first embodiment of the present invention. In the figures, reference numeral 1 denotes a hollow pile (hereinafter referred to as a pile) such as a steel pipe pile and a concrete pile (hereinafter referred to as a pile body). Reference numeral 20 denotes an auger inserted into the pile 1, and reference numeral 30 denotes a base machine installed on the ground, on which a motor 31 having two rotating shafts (an outer shaft and an inner shaft) rotating in opposite directions is mounted. ing.
【００１７】杭体１は先端部が開口されており、先端部
のやや上方の外周には翼１０が取付けられている。この
翼１０は、例えば図３に示すように、中心部に杭体１の
外径Ｄとほぼ等しい径Ｄ2 の穴１２を有し、外径Ｄ1 が
杭体１の外径Ｄより大きい（例えば、Ｄ1 ＝２Ｄ）ドー
ナツ状の円形鋼板１１（又は楕円形鋼板）を２分割して
形成した平板状の鋼製翼１３ａ，１３ｂを、杭体１の先
端部外周又はそれよりやや上方に、始端部と終端部の高
さの差（ピッチ）がＰになるように同方向に連続して溶
接により取付けて、全体としてほぼ螺旋状の翼１０を構
成したものである。The pile 1 has an opening at the tip, and a wing 10 is attached to the outer periphery slightly above the tip. The blade 10 is, for example, as shown in FIG. 3, approximately equal has a hole 12 of diameter D 2, the outer diameter D 1 is larger than the outer diameter D of Kuitai 1 and the outer diameter D of Kuitai 1 in the center (For example, D 1 = 2D) Flat steel wings 13 a and 13 b formed by dividing a donut-shaped circular steel plate 11 (or an elliptical steel plate) into two parts are placed on the outer periphery of the tip of the pile 1 or slightly above it. The blades 10 are attached by welding continuously in the same direction so that the height difference (pitch) between the start end and the end is P, thereby forming a substantially spiral blade 10 as a whole.
【００１８】ここに、円形鋼板１１の外径Ｄ1 （したが
って、翼１０の外径）は、設計及び施工の経験から、一
般に、杭体１の外径Ｄの１．５〜２．５倍程度が望まし
く、また、ピッチＰは、杭体１の外径Ｄの０．０５〜
０．３０倍程度が望ましい。なお、これらは、以下の例
でも同様である。Here, the outer diameter D 1 of the circular steel plate 11 (therefore, the outer diameter of the wing 10) is generally 1.5 to 2.5 times the outer diameter D of the pile 1 based on experience in design and construction. Preferably, the pitch P is 0.05 to the outer diameter D of the pile 1.
Desirably about 0.30 times. These are the same in the following examples.
【００１９】次に、上記のように構成した本実施の形態
の施工方法の一例を図４、図５により説明する。なお、
図４、図５にはベースマシン３０は省略してある。 （１）図４（ａ）に示すように、杭体１内に杭体１より
若干長いオーガー２０を挿入する。なお、軟弱地盤に杭
体１を貫入させる場合は、杭体１を地中に貫入し、先端
部が支持層の近傍に達したときに杭体１内にオーガー２
０を挿入してもよい。Next, an example of the construction method of the present embodiment configured as described above will be described with reference to FIGS. In addition,
4 and 5, the base machine 30 is omitted. (1) As shown in FIG. 4A, an auger 20 slightly longer than the pile 1 is inserted into the pile 1. When the pile 1 is penetrated into the soft ground, the pile 1 is penetrated into the ground, and the auger 2 is inserted into the pile 1 when the tip reaches the vicinity of the support layer.
0 may be inserted.
【００２０】（２）図６に示すように、杭体１をベース
マシン３０に搭載したモータ３１の外軸３２に連結し、
オーガー２０を内軸３３に連結する。このとき、オーガ
ー２０の先端部は、図４（ａ）に示すように、杭体１の
先端部から突出するが、その突出長は、杭体１の外径Ｄ
とほぼ等しいかそれ以下であることが望ましい。(2) As shown in FIG. 6, the pile 1 is connected to an outer shaft 32 of a motor 31 mounted on a base machine 30,
The auger 20 is connected to the inner shaft 33. At this time, the tip of the auger 20 protrudes from the tip of the pile 1 as shown in FIG.
It is desirable to be substantially equal to or less than.
【００２１】（３）モータ３１により、例えば、杭体１
を正方向に、オーガー２０を逆方向に回転させる。な
お、杭体１とオーガー２０に互いに反対方向の回転力を
与える手段としては、図６に示すモータ３１に限定する
ものではなく、例えば１軸のモータにアダプタを取付け
るなど、他の手段を用いてもよい。これにより、図４
（ｂ）に示すように、オーガー２０は杭体１に先行して
先端部近傍の地盤を掘削軟化し、杭体１は翼１０のねじ
作用により地盤中に貫入される。このとき、杭体１の先
端部近傍の土砂は、主として翼１０の作用で翼１０の上
方の杭体１の外周部に移動し、一部の土砂はオーガー２
０により杭体１内に取り込まれる。なお、オーガー２０
により杭体１内に取り込まれる土砂の量は、杭体１の先
端開口部の大きさやオーガー２０の寸法、形状等によっ
て異なるため、これらを調整することにより土砂が杭体
１から溢れないようにする。(3) By the motor 31, for example, the pile 1
Is rotated in the forward direction, and the auger 20 is rotated in the reverse direction. The means for applying rotational forces in the opposite directions to the pile 1 and the auger 20 is not limited to the motor 31 shown in FIG. 6, but other means such as attaching an adapter to a one-axis motor may be used. You may. As a result, FIG.
As shown in FIG. 2B, the auger 20 excavates and softens the ground near the tip portion prior to the pile 1, and the pile 1 penetrates into the ground by the screw action of the wing 10. At this time, the earth and sand near the tip of the pile 1 moves to the outer peripheral portion of the pile 1 above the wing 10 mainly by the action of the wing 10, and a part of the earth and sand is
0 is taken into the pile 1. In addition, auger 20
The amount of sediment taken into the pile body 1 by the above differs depending on the size of the opening at the tip of the pile body 1 and the size and shape of the auger 20. I do.
【００２２】杭体１の貫入にあたっては、オーガー２０
で地盤を翼１０に先行して掘削軟化させるために、杭体
１の回転に必要なトルクはオーガー２０を使用しない場
合に比べて大幅に減少する。また、杭体１とオーガー２
０の回転方向が逆であるため、ベースマシン３０に作用
するモータ３１からの反力も、両者のトルクの差による
反力になるため、大幅に減少する。なお、オーガー２０
による掘削軟化を必要としないほどの軟弱地盤に杭体１
を貫入させるときは、オーガー２０を杭体１の先端部か
ら突出させないで回転を停止しておいてもよい。このよ
うにすれば、杭体１内への土砂の侵入を抑制することが
できる。When the pile 1 is penetrated, the auger 20 is used.
In order to excavate and soften the ground prior to the wing 10, the torque required for rotating the pile 1 is greatly reduced as compared with the case where the auger 20 is not used. In addition, pile body 1 and auger 2
Since the rotation direction of 0 is opposite, the reaction force from the motor 31 acting on the base machine 30 also becomes a reaction force due to the difference between the two torques, and thus is greatly reduced. In addition, auger 20
Pile 1 on soft ground that does not require excavation softening
When the auger 20 is penetrated, the rotation may be stopped without projecting the auger 20 from the tip of the pile 1. In this way, it is possible to suppress intrusion of earth and sand into the pile 1.
【００２３】（４）図５（ａ）に示すように、杭体１の
先端部が支持層に達したときは、杭体１及びオーガー２
０の回転を停止する。なお、打ち止め近くではオーガー
２０による掘削を中止し、杭体１のみの貫入にした方が
先端支持力は大きく発揮される。 （５）ついで、図５（ｂ）に示すように、杭体１をモー
タ３１から外し、杭体１を地中に残置した状態でオーガ
ー２０を反対方向に回転させながらモータ３１を上昇さ
せれば、オーガー２０は杭体１から引上げられ、杭体１
は地盤中に埋設されて施工は終了する。(4) As shown in FIG. 5 (a), when the tip of the pile 1 reaches the support layer, the pile 1 and the auger 2
0 rotation is stopped. In addition, the excavation by the auger 20 is stopped near the stop, and the tip support force is more exerted when the pile body 1 is penetrated only. (5) Then, as shown in FIG. 5B, the pile 1 is removed from the motor 31, and the motor 31 is raised while rotating the auger 20 in the opposite direction with the pile 1 remaining in the ground. If the auger 20 is lifted from the pile 1,
Is buried in the ground and the construction ends.
【００２４】本実施の形態に係るねじ込み杭の施工方法
は、杭体１内に挿入したオーガー２０により杭先端部近
傍の地盤を先行して掘削軟化するため、杭体１を回転す
るためのトルクを軽減することができ、これにより、杭
体１の貫入能率が向上すると共に、オーガー２０やベー
スマシン３０を小型化することができる。また、杭体１
に作用するねじりモーメントが小さいため、肉厚の薄い
鋼管杭やコンクリート杭にも適用することができる。さ
らに、従来ねじ込み式が困難とされていた外径が６００
ｍｍを超える大型の杭体にも適用することができる。The method for constructing a threaded pile according to the present embodiment employs an auger 20 inserted into the pile body 1 to excavate and soften the ground near the tip of the pile in advance, so that the torque for rotating the pile body 1 is increased. Therefore, the penetration efficiency of the pile 1 is improved, and the auger 20 and the base machine 30 can be downsized. In addition, pile 1
Since the torsional moment acting on the pile is small, it can be applied to thin steel pipe piles and concrete piles. Furthermore, the outside diameter, which has conventionally been considered difficult to screw in, is 600 mm.
It can also be applied to large piles exceeding mm.
【００２５】また、上記のように杭体１とオーガー２０
とは互いに反対方向に回転するために、それぞれのトル
クが打ち消し合ってモータ３１からベースマシン３０に
作用する反力を低減することができ、そのため、ベース
マシン３０を小型化しても安定性を確保することができ
る。Also, as described above, the pile 1 and the auger 20
, The torques cancel each other, and the reaction force acting on the base machine 30 from the motor 31 can be reduced. Therefore, stability is ensured even when the base machine 30 is downsized. can do.
【００２６】［実施の形態２］本実施の形態は、図７に
示すように、オーガー２０の先端部より上方に、その外
径が杭体１の内径より若干小径で鋼製の土砂止め板２２
を設けたものである。本実施の形態によれば、オーガー
により掘削軟化された土砂の杭体１内への侵入が土砂止
め板２２により抑止されるため、掘削軟化された土砂が
杭体１の外周に移動して杭体１の周辺の地盤を圧縮し、
周面摩擦力を上昇させる。また、これにより、杭体１の
上部から土砂があふれるおそれがない。なお、杭体１は
先端部のトルクが大きいため、周面摩擦が上昇しても杭
体１の貫入には特に支障がない。[Embodiment 2] In this embodiment, as shown in FIG. 7, a steel sediment stop plate whose outer diameter is slightly smaller than the inner diameter of the pile body 1 is provided above the tip of the auger 20. 22
Is provided. According to the present embodiment, the intrusion of the earth and sand excavated and softened by the auger into the pile body 1 is suppressed by the earth and sand stopper plate 22, so that the excavated and softened earth moves to the outer periphery of the pile body 1 and the pile Compress the ground around body 1,
Increase the peripheral friction force. In addition, there is no risk of earth and sand overflowing from the upper part of the pile body 1. In addition, since the pile 1 has a large torque at the tip, even if the peripheral surface friction increases, there is no particular problem in the penetration of the pile 1.
【００２７】［実施の形態３］図８は本発明の実施の形
態３の要部の模式図である。本実施の形態は、杭体１内
に挿入されて先端部から突出したオーガー２０の先端部
に、地上からの操作によって拡大できる構造のオーガー
ヘッド２１を設けたものである。この場合、オーガーヘ
ッド２１の拡大は、杭体１の外径以上で、かつ翼１０の
外径以内の範囲であることが望ましい。[Embodiment 3] FIG. 8 is a schematic diagram of a main part of Embodiment 3 of the present invention. In the present embodiment, an auger head 21 having a structure that can be enlarged by an operation from the ground is provided at the tip of an auger 20 that is inserted into the pile 1 and protrudes from the tip. In this case, the enlargement of the auger head 21 is desirably in the range of not less than the outer diameter of the pile 1 and not more than the outer diameter of the wing 10.
【００２８】本実施の形態の施工方法も実施の形態１の
場合とほぼ同様であるが、オーガーヘッド２１は、オー
ガー２０を杭体１内に挿入した杭先端部から突出させた
のち最初から拡大してもよく、あるいは、オーガー２０
の先端部が支持層の近傍に達したときに拡大してもよ
い。杭体１の埋設が終了したときは、オーガーヘッド２
１を縮小して元の状態に戻し、杭体１を地中に残置して
オーガー２０を引き上げる。The construction method of the present embodiment is almost the same as that of the first embodiment, except that the auger head 21 is enlarged from the beginning after the auger 20 is projected from the tip of the pile inserted into the pile body 1. Or auger 20
May be enlarged when the leading end portion thereof reaches the vicinity of the support layer. When the embedding of the pile 1 is completed, the auger head 2
The auger 20 is pulled up while the pile 1 is left underground and the auger 20 is lifted.
【００２９】本実施の形態においても実施の形態１の場
合と同様の効果が得られるが、さらに、オーガー２０に
より土砂を掘削軟化させる範囲が広くなるため、杭体１
を回転するためのトルクをより小さくすることができ
る。In this embodiment, the same effect as in the first embodiment can be obtained. However, since the range of excavation and softening of the earth and sand by the auger 20 is widened, the pile 1
The torque for rotating can be further reduced.
【００３０】［実施の形態４］本実施の形態は、杭体１
に設けた翼１０の他の例を示すものである。図９，図１
０の例は、図１０に示すように（図１０は説明を容易に
するため、杭体１の上下を逆にしてある）、杭体１の先
端部を２分割して段差部２ａ，２ｂを設け、一方の段差
部２ａの下端部から他方の段差部２ｂの上端部に達する
ほぼレ字状の取付部３ａを設けると共に、他方の段差部
２ｂの下端部から一方の段差部２ａの上端部に達するほ
ぼレ字状の取付部３ｂを設け、図３で説明した鋼製翼１
３ａ，１３ｂを、図９に示すように、同じ高さで交差さ
せて取付部３ａ，３ｂに溶接により取付けて翼１０を構
成したものである。[Embodiment 4] In this embodiment, a pile 1
5 shows another example of the wing 10 provided in the above. 9 and 1
In the example of No. 0, as shown in FIG. 10 (in FIG. 10, the pile body 1 is turned upside down for ease of explanation), the tip of the pile body 1 is divided into two and the steps 2a and 2b are formed. And a substantially L-shaped mounting portion 3a extending from the lower end of one step 2a to the upper end of the other step 2b, and the upper end of one step 2a from the lower end of the other step 2b. A substantially ridge-shaped mounting portion 3b reaching the portion is provided, and the steel wing 1 described in FIG.
As shown in FIG. 9, the wing 10 is formed by intersecting 3a and 13b at the same height and attaching them to the attaching portions 3a and 3b by welding.
【００３１】上記の段差部３ａ，３ｂの高さはＰ／２で
ある。なお、杭体１の先端部に高さＰの１個の段差部を
設けて連続した螺旋状の取付部を形成し、この取付部に
鋼製翼１４ａ，１４ｂを連続して取付けて、ほぼ螺旋状
の翼１０を構成してもよい。The height of the steps 3a and 3b is P / 2. It should be noted that a single stepped portion having a height P is provided at the tip of the pile body 1 to form a continuous spiral mounting portion, and the steel wings 14a and 14b are continuously mounted on this mounting portion, thereby substantially A spiral wing 10 may be configured.
【００３２】図１１，図１２の例は、図１２に示すよう
に、中心部に杭体１の外径Ｄとほぼ等しい径Ｄ2 の穴１
２を有し、外径Ｄ1 が杭体１の外径Ｄより大きいドーナ
ツ状の円形鋼板１１（又は楕円形鋼板）の一か所を穴１
２から外周まで切断し、これをピッチＰの螺旋状に曲げ
加工して形成したほぼ一巻の螺旋状翼１４を、溶接等に
より杭体１の外周に取付けたものである。なお、杭体１
の先端部に高さＰの１個の段差部を設けて連続した螺旋
状の取付部を形成し、この取付部に螺旋状翼１４を取付
けて螺旋状の翼１０を構成してもよい。In the example shown in FIGS. 11 and 12, as shown in FIG. 12, a hole 1 having a diameter D 2 substantially equal to the outer diameter D of the pile 1 is provided at the center.
2 and a part of a donut-shaped circular steel plate 11 (or an elliptical steel plate) having an outer diameter D 1 larger than the outer diameter D of the pile 1
A spiral wing 14 of approximately one turn, which is cut from 2 to the outer periphery and bent into a spiral with a pitch P, is attached to the outer periphery of the pile 1 by welding or the like. In addition, pile body 1
A spiral step may be formed by providing a single stepped portion having a height P at the tip of the helical blade to form a continuous helical mounting portion and mounting the helical blade 14 to the mounting portion.
【００３３】以上、杭体１に設ける翼１０の一例につい
て説明したが、本発明はこれに限定するものではなく、
翼の形状・構造、数、取付位置、取付手段等は適宜変更
することができる。Although an example of the wing 10 provided on the pile 1 has been described above, the present invention is not limited to this.
The shape / structure, number, mounting position, mounting means, etc. of the wings can be changed as appropriate.
【００３４】[0034]
【発明の効果】本発明に係るねじ込み杭の施工方法は、
先端部又は先端部近傍に翼を有する中空の杭体を地中に
設置する施工方法であって、杭体内にオーガーを挿入し
てその先端部を杭体の先端部から突出させ、杭体とオー
ガーに互いに反対方向の回転力を与えて杭体を地盤中に
ねじ込み、杭体が所定の深さに達したときはオーガーを
引上げるようにしたので、ねじ込み杭の貫入効率を向上
すると共に回転トルクを大幅に低減することができ、併
せて大きな先端支持力を得ることができる。また、杭体
とオーガーの回転が反対方向であるため、ベースマシン
に偏心やねじれが作用することもない。According to the present invention, there is provided a method for constructing a threaded pile,
A method of installing a hollow pile having wings at the tip or near the tip in the ground, in which an auger is inserted into the pile and the tip projects from the tip of the pile, and The piles are screwed into the ground by applying rotational forces in opposite directions to the augers, and when the piles reach a predetermined depth, the augers are pulled up, improving the penetration efficiency of the screwed piles and rotating The torque can be greatly reduced, and a large tip supporting force can be obtained. In addition, since the rotation of the pile body and the auger are in opposite directions, there is no eccentricity or twist on the base machine.
【００３５】上記のねじ込み杭の施工方法において、オ
ーガーに取付けた土砂止め板により杭体内への土砂の侵
入を抑制し、オーガーの先端部により掘削軟化した土砂
を杭体の周面に押出すようにしたので、杭体の周面摩擦
力を上昇させることができる。[0035] In the above-described method for constructing a screw-in pile, the intrusion of earth and sand into the pile body is suppressed by the earth and sand stopper plate attached to the auger, and the excavated and softened earth and sand is extruded to the peripheral surface of the pile body by the tip of the auger. As a result, the peripheral frictional force of the pile body can be increased.
【００３６】また、上記のねじ込み杭の施工方法におい
て、先端部が杭体の先端部より大きく拡大できるオーガ
ーを使用することにより、広い範囲を先行して掘削軟化
できるため、杭体の回転トルクをさらに軽減することが
できる。In the above-described method for constructing a threaded pile, the use of an auger whose tip is larger than the tip of the pile makes it possible to soften the excavation over a wide range. It can be further reduced.
【００３７】本発明に係るねじ込み杭は、先端部又は先
端部近傍の外周に螺旋状翼又は平板状の複数の鋼製翼が
取付けられて上記の施工方法に使用するようにしたの
で、上記と同様の効果を得ることができる。In the screw pile according to the present invention, a spiral wing or a plurality of flat steel wings are attached to the tip portion or the outer periphery near the tip portion to be used in the above-mentioned construction method. Similar effects can be obtained.
【図１】本発明の実施の形態１を説明するための模式図
である。FIG. 1 is a schematic diagram for explaining Embodiment 1 of the present invention.
【図２】図１の杭体先端部の説明図である。FIG. 2 is an explanatory view of a tip end of a pile body of FIG. 1;
【図３】図２の鋼製翼の製作過程の説明図である。FIG. 3 is an explanatory view of a manufacturing process of the steel wing of FIG. 2;
【図４】実施の形態１の施工方法の説明図である。FIG. 4 is an explanatory diagram of a construction method according to the first embodiment.
【図５】実施の形態１の施工方法の説明図である。FIG. 5 is an explanatory diagram of a construction method according to the first embodiment.
【図６】実施の形態１のモータと杭体及びオーガーとの
連結状態を示す模式図である。FIG. 6 is a schematic diagram showing a connection state of the motor, the pile body, and the auger according to the first embodiment.
【図７】本発明の実施の形態２の説明図である。FIG. 7 is an explanatory diagram of Embodiment 2 of the present invention.
【図８】本発明の実施の形態３の説明図である。FIG. 8 is an explanatory diagram of Embodiment 3 of the present invention.
【図９】本発明の実施の形態３の要部の斜視図である。FIG. 9 is a perspective view of a main part according to a third embodiment of the present invention.
【図１０】図９の杭体先端部の説明図である。FIG. 10 is an explanatory view of the tip of the pile body of FIG. 9;
【図１１】実施の形態３の他の例の要部の斜視図であ
る。FIG. 11 is a perspective view of a main part of another example of the third embodiment.
【図１２】図１１の螺旋状の製作過程の説明図である。FIG. 12 is an explanatory view of the spiral manufacturing process of FIG. 11;
１ 杭体 ２ａ，２ｂ 段差部 ３ａ，３ｂ 翼の取付部 １０ 翼 １３ａ，１３ｂ 鋼製翼 １４ 螺旋状翼 ２０ オーガー ２１ オーガーヘッド ２２ 土砂止め板 ３０ ベースマシン ３１ モータ DESCRIPTION OF SYMBOLS 1 Pile 2a, 2b Step part 3a, 3b Blade attachment part 10 Blade 13a, 13b Steel wing 14 Spiral wing 20 Auger 21 Auger head 22 Sand stopper plate 30 Base machine 31 Motor
───────────────────────────────────────────────────── フロントページの続き (72)発明者 篠原 敏雄 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 森 玄 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 Ｆターム(参考） 2D041 AA02 BA21 BA33 CA05 CB06 DB02 DB03 FA03 2D050 AA06 CA02 CB03 EE14 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshio Shinohara 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Gen Gen Mori 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Sun F-term in Honko Pipe Co., Ltd. (Reference) 2D041 AA02 BA21 BA33 CA05 CB06 DB02 DB03 FA03 2D050 AA06 CA02 CB03 EE14
Claims (4)
の杭体を地盤中に設置する施工方法であって、 前記杭体内にオーガーを挿入してその先端部を前記杭体
の先端部から突出させ、前記杭体とオーガーに互いに反
対方向の回転力を与えて前記杭体を地盤中にねじ込み、
該杭体が所定の深さに達したときは前記オーガーを引上
げることを特徴とするねじ込み杭の施工方法。1. A method for installing a hollow pile having wings at a tip portion or a vicinity of a tip portion in a ground, wherein an auger is inserted into the pile body and the tip portion is attached to the tip portion of the pile body. Projecting from the pile, screwing the pile into the ground by applying a rotational force in the opposite direction to the pile and the auger,
When the pile reaches a predetermined depth, the auger is pulled up, and a method for constructing a threaded pile is provided.
体内への土砂の侵入を抑制し、前記オーガーの先端部よ
り掘削軟化した土砂を前記杭体の周面に押出して該杭体
の周面摩擦力を上昇させることを特徴とする請求項１記
載のねじ込み杭の施工方法。2. An earth and sand stopper attached to an auger suppresses intrusion of earth and sand into a pile body, and extrudes softened earth and sand excavated from the tip of the auger to the peripheral surface of the pile body to thereby extrude the peripheral surface of the pile body. The method according to claim 1, wherein the frictional force is increased.
きるオーガーを使用することを特徴とする請求項１記載
のねじ込み杭の施工方法。3. The method for constructing a screwed pile according to claim 1, wherein an auger whose tip is larger than the tip of the pile body is used.
又は平板状の複数の鋼製翼が取付けられ、請求項１，
２，３のいずれかの施工方法により施工されることを特
徴とるすねじ込み杭。4. A spiral wing or a plurality of flat-plate-shaped steel wings are attached to a tip portion or an outer periphery near the tip portion.
A threaded pile that is constructed by one of the construction methods described in (2) and (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34669298A JP3677645B2 (en) | 1998-12-07 | 1998-12-07 | Construction method of screwed pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34669298A JP3677645B2 (en) | 1998-12-07 | 1998-12-07 | Construction method of screwed pile |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2004332670A Division JP2005048590A (en) | 2004-11-17 | 2004-11-17 | Work execution method for screwed pile and screwed pile used therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000170161A true JP2000170161A (en) | 2000-06-20 |
| JP3677645B2 JP3677645B2 (en) | 2005-08-03 |
Family
ID=18385178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34669298A Expired - Fee Related JP3677645B2 (en) | 1998-12-07 | 1998-12-07 | Construction method of screwed pile |
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| Country | Link |
|---|---|
| JP (1) | JP3677645B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005200824A (en) * | 2004-01-07 | 2005-07-28 | Nippon Koatsu Concrete Kk | Immersion method for pile and cutter plate |
| JP2009167714A (en) * | 2008-01-17 | 2009-07-30 | Toshio Akesaka | Construction apparatus and construction method of cylindrical pipe pile |
| KR20230042867A (en) * | 2021-09-23 | 2023-03-30 | 박진규 | Helical pile construction method using extension boring |
-
1998
- 1998-12-07 JP JP34669298A patent/JP3677645B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005200824A (en) * | 2004-01-07 | 2005-07-28 | Nippon Koatsu Concrete Kk | Immersion method for pile and cutter plate |
| JP4481662B2 (en) * | 2004-01-07 | 2010-06-16 | 日本高圧コンクリート株式会社 | Pile setting method and blade plate |
| JP2009167714A (en) * | 2008-01-17 | 2009-07-30 | Toshio Akesaka | Construction apparatus and construction method of cylindrical pipe pile |
| KR20230042867A (en) * | 2021-09-23 | 2023-03-30 | 박진규 | Helical pile construction method using extension boring |
| KR102595736B1 (en) * | 2021-09-23 | 2023-10-31 | 박진규 | Helical pile construction method using extension boring |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3677645B2 (en) | 2005-08-03 |
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