JP2008057113A - Rotary press-in pile and its construction method - Google Patents

Rotary press-in pile and its construction method Download PDF

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JP2008057113A
JP2008057113A JP2006231885A JP2006231885A JP2008057113A JP 2008057113 A JP2008057113 A JP 2008057113A JP 2006231885 A JP2006231885 A JP 2006231885A JP 2006231885 A JP2006231885 A JP 2006231885A JP 2008057113 A JP2008057113 A JP 2008057113A
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pile
rotary press
steel pipe
ground
fit
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Takeshi Inoue
武 井上
Taketo Kato
健人 加藤
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KFC Ltd
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KFC Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary press-in pile which exerts high peripheral surface friction resistance to pulling-out and a great end bearing capacity against pushing-in, despite a rotary press-in type. <P>SOLUTION: In the rotary press-in pile 10 for being pressed into ground while being rotated, a plurality of grouting ejection holes 11c are provided in a scattering manner in the peripheral wall of a steel pipe pile body, the leading end of which is provided with a lower spiral blade 11a; knot protrusions 11b are provided at each predetermined pitch in the length direction of the steel pipe pile body; and an upper blade 13 larger than in diameter than the lower blade is provided at the upper end of the long anchoring portion 11 of the steel pipe pile body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は回転圧入杭及びその施工方法に係わり、特に、回転させながら地盤に圧入される回転圧入杭及びその施工方法に関する。   The present invention relates to a rotary press-fit pile and a construction method thereof, and more particularly, to a rotary press-fit pile that is press-fitted into the ground while rotating and a construction method thereof.

軟弱地盤を改良する目的で該地盤中に回転圧入される鋼管杭がある（特許文献１及び特許文献２参照）。かかる従来技術の鋼管杭は、他の削孔手段によらずに鋼管杭自体を回転圧入する形で地盤に打ち込まれる回転圧入杭である。この種の杭は、比較的安価で小型のボーリングマシン（打撃を伴わないスピンドルタイプのボーリングマシン等）で簡便に地盤に打設でき、騒音や排土が少ないというメリットがある。しかし、反面、貫入抵抗が小さいため支持力が限定され、特に周面摩擦抵抗がないため引き抜きに対する支持力について大きな値を期待することができない。
一方、二重管堀りをしてグラウト注入を行なうような大口径杭は、引き抜きに対する周面摩擦抵抗と押し込みに対する先端支持力の両方が確保され、大きな支持力があり、地盤を強固に支持することができる。しかし、かかる大口径杭では、専用の大型削孔機械が必要となり、騒音や排土の問題があり、また狭隘な箇所には施工不可能となる問題がある。
特公平２−６２６４８号公報 特開２００５−２９９１９２号公報 There is a steel pipe pile that is rotationally pressed into the ground for the purpose of improving the soft ground (see Patent Document 1 and Patent Document 2). Such a conventional steel pipe pile is a rotary press-fit pile that is driven into the ground in such a manner that the steel pipe pile itself is rotationally press-fitted without using other drilling means. This type of pile has the advantage that it can be easily placed on the ground with a relatively inexpensive and small boring machine (such as a spindle type boring machine that does not strike), and has less noise and soil removal. However, on the other hand, since the penetration resistance is small, the supporting force is limited. Especially, since there is no peripheral surface frictional resistance, it is not possible to expect a large value for the supporting force for pulling out.
On the other hand, large-diameter piles that are double-drilled and grout injected have both large peripheral force and strong support for the ground because both the peripheral friction resistance against pulling and the tip supporting force against pushing are secured. can do. However, such a large-diameter pile requires a dedicated large-scale drilling machine, which has problems of noise and earth removal, and has a problem that it cannot be constructed in a narrow area.
Japanese Examined Patent Publication No. 2-62648 JP 2005-299192 A

以上からは、本発明の目的は、回転圧入式でありながら引き抜きに対する周面摩擦抵抗と押し込みに対する先端支持力の大きな鋼管杭、すなわち回転圧入杭を提供することである。
本発明の別の目的は、防錆処理が施された表面ツルツルの鋼管でも確実に押し込み支持力と引き抜き支持力を確保できるようにすることである。
本発明の別の目的は、先端から鋼管内に土砂が入り込んでも、グラウトを注入可能にすることである。
本発明の別の目的は、定着長全体をグラウトすることによって、周面摩擦力を増大させ、これによって地盤の支持層に到達しない短い杭でも支持力を大きくすることである。
本発明の別の目的は、施工性（杭の貫入性）は従来型の回転圧入杭と遜色ないまま、引き抜きや押し込みに対する大きな支持力を発揮できるようにすることである。 In view of the above, an object of the present invention is to provide a steel pipe pile that is a rotary press-fitting type and has a large surface frictional resistance against drawing and a large tip support force against pushing, that is, a rotary press-fit pile.
Another object of the present invention is to ensure that the push-in support force and the pull-out support force can be ensured even with a smooth steel pipe subjected to a rust prevention treatment.
Another object of the present invention is to make it possible to inject grout even if earth or sand enters the steel pipe from the tip.
Another object of the present invention is to increase the peripheral friction force by grouting the entire fixing length, thereby increasing the support force even for short piles that do not reach the ground support layer.
Another object of the present invention is to make it possible to exert a large supporting force against pulling out and pushing in while maintaining workability (pile penetration) comparable to conventional rotary press-fit piles.

本発明は回転させながら地盤に圧入される回転圧入杭であり、先端に螺旋状の下部羽根を設けた鋼管抗本体の周壁に、グラウト材吐出孔を該鋼管抗本体の長さ方向に複数個散在して有すると共に、前記鋼管抗本体の長さ方向所定ピッチ毎に節突起を備えている。
本発明の回転圧入杭は、前記鋼管杭本体における定着長部の上端に前記下部羽根より大径の上部羽根を備えている。
本発明の回転圧入杭は、更に、前記下部羽根と前記上部羽根との間に第３の羽根を１段以上備えている。
本発明の回転圧入杭は、更に、前記下部羽根より上側の鋼管本体を被覆する袋体を供えている。
本発明の第１の施工方法は、前記回転圧入杭を回転圧入して地中に打設するステップ、該回転圧入杭の鋼管本体内にグラウト材を加圧注入するステップ、前記グラウト材吐出孔よりグラウト材を排出して定着長部を形成するステップを有している。
本発明の第２の施工方法は、前記回転圧入杭を回転圧入して地中に打設しながら、該回転圧入杭の鋼管本体内にグラウト材を加圧注入するステップ、グラウト材吐出孔よりグラウト材を排出して定着長部を形成するステップを有している。 The present invention is a rotary press-fitting pile that is press-fitted into the ground while rotating, and a plurality of grout material discharge holes are provided in the length direction of the steel pipe anti-main body on the peripheral wall of the steel pipe anti-main body provided with a spiral lower blade at the tip. In addition to being scattered, it has node protrusions for every predetermined pitch in the length direction of the steel pipe anti-main body.
The rotary press-fitting pile of the present invention includes an upper blade having a diameter larger than that of the lower blade at the upper end of the fixing length portion in the steel pipe pile body.
The rotary press-fitting pile of the present invention further includes one or more third blades between the lower blade and the upper blade.
The rotary press-fitting pile of the present invention further includes a bag body covering the steel pipe body above the lower blade.
The first construction method of the present invention includes a step of rotationally press-fitting the rotary press-fit pile and placing it in the ground, a step of pressure-injecting a grout material into a steel pipe body of the rotary press-fit pile, and the grout discharge port It further includes a step of discharging the grout material to form a fixing length portion.
The second construction method of the present invention comprises a step of pressurizing and injecting a grout material into a steel pipe body of the rotary press-fit pile while rotating and inserting the rotary press-fit pile into the ground, A step of discharging the grout material to form a fixing length portion;

本発明によれば、小型の機器で回転圧入杭を施工することができ、しかもグラウトが可能であるため、グラウトによる地盤改良効果を最大限に発現させることができる。なお、従来の回転圧入杭では下部羽根によって地盤を乱してしまうので周辺地盤の緩みを引き起こし、その影響を受けて、1本当たりの杭支持力が小さいが、本発明はグラウトを前提としているため、むしろ、杭の周面のある領域に限って下部羽根が緩ませた地盤にグラウト材を注入することによって、均一なグラウト柱体が形成され、これによって確実な支持力が得られる。すなわち、本発明は地盤を下部羽根で緩ませることによるデメリットをメリットに転換するものである。
本発明によれば、節突起によりグラウト付着性能と荷重伝達性能を確保できるので、防錆処理が施された表面ツルツルの鋼管でも確実に地盤支持力の増大を図ることができ、しかも、鋼管周辺の地盤にグラウト材が入るため、鋼管に対する防食効果を発揮できる。
また、本発明によれば、グラウトは杭先端からではなく鋼管杭本体の周壁に設けた逆止弁機構付きグラウト材吐出孔から行なうので、鋼管先端部の閉塞に影響されずに注入できる。また、鋼管下端からグラウト材を吐出させて先端支持力をアップさせるのではなく、定着長部全体をグラウトすることによって周面摩擦力を増大させるもので、これにより、地盤の支持層に到達しない短い杭でも効果を発現できる。すなわち、本発明によれば、回転圧入式でありながらグラウトすることにより押し込み支持力と引き抜き支持力の大きな鋼管杭、すなわち回転圧入杭を提供できる。 According to the present invention, it is possible to construct a rotary press-fit pile with a small device and to grout, so that the ground improvement effect by the grout can be maximized. In addition, in the conventional rotary press-fit pile, the ground is disturbed by the lower blades, causing the surrounding ground to loosen, and affected by this, the pile supporting force per one is small, but the present invention is premised on the grout Therefore, a uniform grout pillar is formed by injecting the grout material into the ground where the lower blades are loosened only in a region where the peripheral surface of the pile is present, thereby obtaining a reliable supporting force. That is, the present invention converts the disadvantages of loosening the ground with the lower blades into merits.
According to the present invention, the grout adhesion performance and load transmission performance can be ensured by the node protrusions, so that it is possible to surely increase the ground support force even in the steel pipe with the rust-proof surface, and the periphery of the steel pipe Since the grout material enters the ground, it is possible to exert an anticorrosive effect on the steel pipe.
Moreover, according to this invention, since grout is performed from the grout material discharge hole with a non-return valve mechanism provided in the surrounding wall of the steel pipe pile main body instead of from the pile front-end | tip, it can inject | pour without being influenced by obstruction | occlusion of the steel pipe front-end | tip part. Also, instead of discharging the grouting material from the lower end of the steel pipe to increase the tip support force, it is intended to increase the peripheral frictional force by grouting the entire fixing length, so that it does not reach the ground support layer. Even short piles can be effective. That is, according to the present invention, it is possible to provide a steel pipe pile having a large indentation support force and pull-out support force, that is, a rotary press-fit pile, by being grouted while being a rotary press-fit type.

本発明によれば、下部羽根部より大きい径の上部羽根部を鋼管杭本体の定着長部の上端に設けたから、施工時上部羽根部の下側の地盤を圧密することになり、特に自由長部との境界域で大きな押し込み支持力を発揮することができる。また、上部羽根による地盤の圧密により上部側へのグラウトの逸失を抑止することができる。
本発明によれば、前記下部羽根と前記上部羽根との間に第３の羽根を１段以上設けたから、より大きな杭支持力を得ることができる。
本発明によれば、下部羽根より上側の鋼管杭本体を袋体（パッカー）で被覆するようにしたから、グラウトを鋼管杭本体から直接地盤に注入しないで袋体の内部に注入して膨らませる形で造成体を地中に形成するため、地盤性状にかかわりなく確実且つ均一な杭ができる。また、本発明によれば、地盤に亀裂や緩い部分があってもグラウトが逃げていってしまうことはなく、しかも、袋体からグラウトの水分が出るのでグラウト強度を上げることができる。また、パッカーを用いたグラウト注入が可能となるため長さ方向に任意の領域に定着長部を形成することができる。
本発明によれば、上部自由長部接続後、回転圧入しながらグラウトを行なうことができ、作業性の向上と、より確実な改良効果が得られる。 According to the present invention, since the upper blade portion having a diameter larger than that of the lower blade portion is provided at the upper end of the fixing length portion of the steel pipe pile main body, the ground below the upper blade portion at the time of construction is consolidated, and particularly the free length. A large indentation support force can be exhibited in the boundary area with the part. Moreover, the loss of the grout to the upper side can be suppressed by the consolidation of the ground by the upper blades.
According to the present invention, since one or more third blades are provided between the lower blade and the upper blade, a greater pile supporting force can be obtained.
According to the present invention, since the steel pipe pile main body above the lower blade is covered with the bag body (packer), the grout is injected from the steel pipe pile main body directly into the ground and inflated into the bag body. Since the formed body is formed in the ground, a reliable and uniform pile can be formed regardless of the ground properties. In addition, according to the present invention, the grout does not escape even if there are cracks or loose parts in the ground, and the grout moisture can be increased from the bag body, so that the grout strength can be increased. In addition, since the grout injection using the packer is possible, the fixing length portion can be formed in an arbitrary region in the length direction.
According to the present invention, after connecting the upper free length portion, it is possible to grout while rotationally press-fitting, so that workability is improved and a more reliable improvement effect is obtained.

（Ａ）第１実施例
図１は第１実施例の回転圧入杭の正面図である。回転圧入杭１０は、中空で全長3000〜6000mm、直径114.3mm、厚さ4.5mmの鋼管杭であり、図２(a)~(d)に示すように、下部定着長部１１と上部自由長部１２と上部羽根部１３に分離できるようになっている。
下部定着長部１１は2000〜5000mmの長さを備え、その先端には螺旋状の下部羽根部１１aが形成され、下部定着長部１１の外周には第１のピッチ（図では500mm）で円形の節突起１１ｂが形成され、かつ、下部定着長部１１の周壁には第２のピッチ（図では600mm）で逆止弁機構付きグラウト材吐出孔１１ｃが形成され、下部定着長部１１の他端部には上部自由長部１２と接続するためのネジ構成の継ぎ手１１ｄ(図２（ｂ）参照)が形成されている。 (A) 1st Example FIG. 1: is a front view of the rotary press-fit pile of 1st Example. The rotary press-fit pile 10 is a hollow steel pipe pile having a total length of 3000 to 6000 mm, a diameter of 114.3 mm, and a thickness of 4.5 mm. As shown in FIGS. 2 (a) to 2 (d), the lower fixing length 11 and the upper free length The part 12 and the upper blade part 13 can be separated.
The lower fixing length portion 11 has a length of 2000 to 5000 mm, a spiral lower blade portion 11a is formed at the tip thereof, and the outer periphery of the lower fixing length portion 11 is circular at a first pitch (500 mm in the drawing). And a grout material discharge hole 11c with a check valve mechanism is formed on the peripheral wall of the lower fixing length portion 11 at a second pitch (600 mm in the figure). A threaded joint 11d (see FIG. 2B) is formed at the end to connect to the upper free length 12.

図３（Ａ）は下部羽根部１１ａ（図１のＡ部分）の拡大図、図３（Ｂ）は図１のＢ矢視図である。下部羽根部１１ａは図３（Ａ）に示すように鋼管杭の先端を外側に張り出すようにして塑性加工し、その張り出し部に切り込みを入れて螺旋状に曲げ加工を施して形成されている（特開2005-68987号公報参照）。下部羽根部１１ａの直径は図３（Ｂ）より204mmであり、鋼管本体の２倍程度の大きさとなっている。
図４は節突起１１ｂ周辺（図１のＣ部分）における鋼管杭の長手方向の一部破断図である。節突起１１ｂはビード溶接加工により形成される。図５は逆止弁機構付きグラウト材吐出孔１１ｃ周辺（図１のＤ部分）における鋼管杭の長手方向の一部破断図である。逆止弁機構付きグラウト材吐出孔１１ｃはバルブ加工により形成され、吐出孔11c‐1、逆止弁11c‐2で構成され、グラウトの加圧注入時に逆止弁11c‐2が開いてグラウトが吐き出されるようになっている。
上部自由長部１２は1000mm程の長さを備え、その下部先端には下部定着長部１１と接続するためのネジ構成の継ぎ手１２a(図２(ｄ)参照)が形成されている。上部羽根部１３は、図２（ｃ）に示すように、上部羽根１３ａと継ぎ手部（ジョイントカプラ）１３ｂを備え、継ぎ手部１３ｂを介して下部定着長部１１と上部自由長部１２間が接続される。上部羽根１３ａの外形は下部羽根１１ａの1.5倍程度、下部羽根部の外径は鋼管本体の２倍程度が望ましい。
鋼管杭本体（回転圧入杭）１０は標準的に防錆処理されたものを用いる。防錆処理された鋼管はグラウト材との付着が小さいが、節突起１１ｂによって地盤と杭の荷重伝達性能が大幅に向上する。 3A is an enlarged view of the lower blade portion 11a (A portion in FIG. 1), and FIG. 3B is a view as viewed in the direction of arrow B in FIG. As shown in FIG. 3 (A), the lower blade portion 11a is formed by plastic working so that the tip of the steel pipe pile projects outward, and a cut is made in the projecting portion to be helically bent. (See JP-A-2005-68987). The diameter of the lower blade | wing part 11a is 204 mm from FIG. 3 (B), and has a magnitude | size about 2 times the steel pipe main body.
FIG. 4 is a partially cutaway view in the longitudinal direction of the steel pipe pile around the node protrusion 11b (C portion in FIG. 1). The node protrusion 11b is formed by bead welding. FIG. 5 is a partial cutaway view in the longitudinal direction of the steel pipe pile around the grout material discharge hole 11c with check valve mechanism (D portion in FIG. 1). The grout material discharge hole 11c with a check valve mechanism is formed by valve processing, and is composed of a discharge hole 11c-1 and a check valve 11c-2. When the grout is pressurized and injected, the check valve 11c-2 opens and the grout It is supposed to be exhaled.
The upper free length portion 12 has a length of about 1000 mm, and a joint 12a (see FIG. 2D) having a screw structure for connecting to the lower fixing length portion 11 is formed at the lower end. As shown in FIG. 2C, the upper blade portion 13 includes an upper blade 13a and a joint portion (joint coupler) 13b, and the lower fixing length portion 11 and the upper free length portion 12 are connected via the joint portion 13b. Is done. The outer shape of the upper blade 13a is preferably about 1.5 times that of the lower blade 11a, and the outer diameter of the lower blade portion is preferably about twice that of the steel pipe body.
As the steel pipe pile main body (rotary press-fitting pile) 10, a rust-proof treated one is used. The steel pipe subjected to the rust prevention treatment has little adhesion to the grout material, but the load transmission performance of the ground and the pile is greatly improved by the node protrusion 11b.

第１実施例の回転圧入杭１０を地盤に回転圧入後、あるいは地盤に回転圧入しながらグラウト材を加圧注入すると、下部羽根１１ａが緩ませた地盤にグラウト材が複数のグラウト材吐出孔１１ｃより排出し、均一なグラウト柱体が形成され、これによって確実な支持力が得られる。すなわち、杭圧入によって、杭周囲の地盤を均一に攪拌した状態で、グラウトを行い、その均一なグラウトとの付着によって大きな荷重伝達性能を得ることが可能となる。この際、グラウトの不測部位への逸失等が起こらない。
また、回転圧入杭１０を打設する際、杭の先端から鋼管内に土砂が入り込むが、グラウト材は杭先端からではなく鋼管杭本体の周壁に設けた逆止弁機構付きグラウト材吐出孔１１ｃから行なうので、鋼管先端部の閉塞に影響されずに注入することができる。すなわち、本発明の回転圧入杭１０は鋼管下端からグラウト材を吐出させて先端支持力をアップさせるのではなく、定着長部全体をグラウトすることによって、周面摩擦力を増大させて支持力をアップするもので、これによって地盤の支持層に到達しない短い杭でも支持力をアップすることができる。つまり、施工性（杭の貫入性）は従来型の回転圧入杭と遜色ないまま、引き抜きや押し込みに対する大きな支持力を発揮できる。 After the rotary press-fitting pile 10 of the first embodiment is rotary press-fitted into the ground, or when the grout material is pressurized and injected while being rotary press-fitted into the ground, the grout material has a plurality of grout discharge holes 11c on the ground loosened by the lower blades 11a. It discharges more, and a uniform grout pillar body is formed, and reliable support force is obtained by this. That is, it is possible to grout with the pile press-fitting in a state where the ground around the pile is uniformly agitated, and to obtain a large load transmission performance by adhering to the uniform grout. At this time, loss of grout to unforeseen parts does not occur.
Further, when the rotary press-fit pile 10 is placed, earth and sand enter the steel pipe from the tip of the pile, but the grout material is not from the tip of the pile, but the grout material discharge hole 11c with a check valve mechanism provided in the peripheral wall of the steel pipe pile body. Therefore, the injection can be performed without being affected by the blockage of the steel pipe tip. In other words, the rotary press-fit pile 10 of the present invention does not discharge the grout material from the lower end of the steel pipe to increase the tip support force, but increases the peripheral friction force by grouting the entire fixing length, thereby increasing the support force. This increases the support force even with a short pile that does not reach the ground support layer. In other words, the workability (pile penetration) is not inferior to that of conventional rotary press-fit piles, and can exert a great support for pulling out and pushing.

図６は回転圧入杭１０を地盤に施工した状態を示す説明図であり、下部羽根部１１ａと上部羽根部１３間で均一なグラウト柱体３１が形成されて定着長領域となり、上部羽根部１３と地表間はさほど定着に寄与せず自由長領域となる。上部羽根部１３から最初の節突起までの領域は圧密領域である。下部羽根部１１ａより大きい径の上部羽根部１３を鋼管杭本体の下部定着長部１１の上端に設けた結果、施工時に該上部羽根部１３の下側の地盤を圧密し、上部自由長部１２との境界域で大きな押し込み支持力を発揮する。また、上部羽根部１３による地盤の圧密により上部側へのグラウト材の逸失を抑止することができる。   FIG. 6 is an explanatory view showing a state in which the rotary press-fit pile 10 is constructed on the ground. A uniform grout column 31 is formed between the lower blade portion 11 a and the upper blade portion 13 to form a fixing length region, and the upper blade portion 13. The space between the earth and the ground does not contribute much to the settlement and becomes a free-length area. A region from the upper blade portion 13 to the first node protrusion is a consolidation region. As a result of providing the upper blade portion 13 having a diameter larger than the lower blade portion 11a at the upper end of the lower fixing length portion 11 of the steel pipe pile main body, the ground below the upper blade portion 13 is consolidated during construction, and the upper free length portion 12 Exhibits a large indentation support force in the boundary area. Moreover, the loss of the grout material to the upper side can be suppressed by the consolidation of the ground by the upper blade portion 13.

（Ｂ）第２実施例
第１実施例の回転圧入杭は上部羽根部１３を備えているが、この上部羽根部１３は圧密領域を形成して支持力をアップする上で必要であるが地盤によっては必ずしも必要ではない。
図７は第２実施例の回転圧入杭を地盤に施工した状態を示す説明図である。第２実施例の回転圧入杭は第１実施例の回転圧入杭から上部羽根部１３を削除したもので、その他の点では同じであり、同一部分には同一符号を付している。
第２実施例によれば、第１実施例と圧密領域が形成される効果を除けば同等の効果を奏することができる。また、第２実施例によれば、先端羽根だけなので経済的であり、杭長が短い場合には上部自由長部１２を省略して接続作業を不要にでき、施工性を向上することができる。 (B) Second embodiment The rotary press-fit pile of the first embodiment is provided with an upper blade portion 13, but this upper blade portion 13 is necessary for forming a compacted region and increasing the supporting force, but the ground. This is not always necessary.
FIG. 7 is an explanatory view showing a state in which the rotary press-fitting pile of the second embodiment is constructed on the ground. The rotary press-fit pile of the second embodiment is obtained by deleting the upper blade portion 13 from the rotary press-fit pile of the first embodiment, and is the same in other respects, and the same portions are denoted by the same reference numerals.
According to the second embodiment, the same effects as those of the first embodiment can be obtained except for the effect of forming the consolidation region. In addition, according to the second embodiment, it is economical because only the tip blade is used, and when the pile length is short, the upper free length portion 12 can be omitted, and the connection work can be omitted, and the workability can be improved. .

（Ｃ）第３実施例
第３実施例の回転圧入杭は下部羽根部１１ａと上部羽根部１３との間に第３の羽根を１段以上備えたもので、より大きな杭支持力が得られる。
図８は第３実施例の回転圧入杭を地盤に施工した状態を示す図であり、下部羽根部１１ａと上部羽根部１３との間に複数の中間羽根部４１が設けられている。中間羽根部４１を除いた他の構成は第１実施例と同一であり、同一部分には同一符号を付している。
多段羽根タイプの第３実施例によれば、第１実施例の効果に加えて、更に、上から下に順に圧密するのでより杭支持力が向上するという効果が発生する。 (C) Third Example The rotary press-fit pile of the third example is provided with one or more third blades between the lower blade portion 11a and the upper blade portion 13, and a greater pile supporting force can be obtained. .
FIG. 8 is a view showing a state in which the rotary press-fitting pile of the third embodiment is constructed on the ground, and a plurality of intermediate blade portions 41 are provided between the lower blade portion 11 a and the upper blade portion 13. Other configurations except for the intermediate blade portion 41 are the same as those of the first embodiment, and the same portions are denoted by the same reference numerals.
According to the third embodiment of the multi-stage blade type, in addition to the effect of the first embodiment, the pile supporting force is further improved because consolidation is performed in order from the top to the bottom.

（Ｄ）第４実施例
第４実施例の回転圧入杭は下部羽根より上側の鋼管杭本体の一部を被覆する袋体（パッカー）を備えた実施例である。
図９は第４実施例の回転圧入杭の説明図であり、第１実施例の下部羽根部１１ａから上部羽根部１３までの鋼管杭本体の一部（下部定着長部）を袋体５１で被覆した構成を備えている。袋体は織物、不織物、編物、などの脱水性があるものにより作成することが望ましい。
第４実施例の回転圧入杭１０を地盤に回転圧入後にグラウト材を加圧注入すると、該グラウト材が複数のグラウト材吐出孔１１ｃより袋体５１に注入される。この結果、図１０に示すように注入されたグラウト材により袋体５１が膨らむ形で造成体が地中に形成されるため、地盤性状にかかわりなく確実且つ均一な杭ができる。また、地盤に亀裂や緩い部分があってもグラウトが逃げていってしまうことはない。さらに、袋体からグラウトの水分が出るのでグラウト強度も上がる。すなわち、第４実施例よれば、直接地盤に注入するより袋内への注入によって一層確実にグラウト柱状体を形成することが可能となる。
なお、図９は第１実施例の回転圧入杭を袋体５１で被覆した例であるが、図７の第２実施例の回転圧入杭を袋体５１で被覆するように構成することもできる。この場合には、下部羽根部１１ａから下部定着長部１１の上端部までを袋体５１で被覆するようにする。 (D) Fourth Example The rotary press-fit pile of the fourth example is an example provided with a bag (packer) that covers a part of the steel pipe pile main body above the lower blade.
FIG. 9 is an explanatory view of the rotary press-fitting pile of the fourth embodiment, and a part (lower fixing length portion) of the steel pipe pile main body from the lower blade portion 11a to the upper blade portion 13 of the first embodiment is a bag body 51. It has a coated configuration. The bag body is preferably made of a dewaterable material such as woven fabric, non-woven fabric, or knitted fabric.
When the grout material is pressurized and injected after the rotary press-fitting pile 10 of the fourth embodiment is rotationally pressed into the ground, the grout material is injected into the bag body 51 from the plurality of grout material discharge holes 11c. As a result, as shown in FIG. 10, the formed body is formed in the ground so that the bag body 51 is expanded by the injected grout material, so that a reliable and uniform pile can be formed regardless of the ground properties. Also, the grout will not escape even if there are cracks or loose parts in the ground. Furthermore, since the grout moisture comes out of the bag body, the grout strength also increases. That is, according to the fourth embodiment, it is possible to form the grout columnar body more reliably by the injection into the bag than the direct injection into the ground.
9 shows an example in which the rotary press-fit pile of the first embodiment is covered with the bag body 51. However, the rotary press-fit pile of the second embodiment of FIG. . In this case, the bag body 51 covers the lower blade portion 11 a to the upper end portion of the lower fixing long portion 11.

（Ｅ）第１の施工方法
図１１〜図１３は本発明の第１の施工方法説明図であり、小型の回転式削孔機械６１を用いて第１実施例の回転圧入杭１０を施工する例である。第１実施例の回転圧入杭１０は図２で説明したように、下部定着長部１１と上部自由長部１２と上部羽根部１３を組み立てて構成される。
まず、図１１（Ａ）に示すように回転式削孔機械６１に下部定着長部１１を把持させて所定ストロークづつ回転圧入する。図１１（Ｂ）に示すように下部定着長部１１の圧入が終了すれば、図１１（Ｃ）に示すように回転式削孔機械６１の下部定着長部１１の把持を解除する。ついで、図１２（Ａ）に示すように下部定着長部１１の上端部に上部羽根部１３を接続する。以後、図１２（Ｂ）に示すように回転式削孔機械６１により把持された上部自由長部１２を上部羽根部１３の継ぎ手により下部定着長部１１に接続し、接続完了後、回転圧入杭１０を所定ストロークづつ回転圧入する。そして、図１３（Ａ）に示すように回転圧入杭１０の圧入が終了すれば、図１３（Ｂ）に示すように上部自由長部１２の口元をバルブ６２で塞いでグラウト注入装置７１よりグラウトを加圧注入する。この加圧注入により、下部羽根１１ａが緩ませた地盤にグラウト材が複数のグラウト材吐出孔１１ｃより排出し、図６に示すように均一なグラウト柱体３１が形成され、これによって確実な支持力が得られる。
以上は第１実施例の回転圧入杭１０を施工する例であるが、同様に第２〜第４実施例の回転圧入杭を施工することができる。 (E) 1st construction method FIGS. 11-13 is the 1st construction method explanatory drawing of this invention, and constructs the rotary press-fit pile 10 of 1st Example using the small rotary drilling machine 61. FIG. It is an example. As described with reference to FIG. 2, the rotary press-fit pile 10 of the first embodiment is configured by assembling the lower fixing length portion 11, the upper free length portion 12, and the upper blade portion 13.
First, as shown in FIG. 11A, the rotary fixing machine 11 is held by the rotary drilling machine 61 and rotationally press-fitted by a predetermined stroke. When the press-fitting of the lower fixing length portion 11 is completed as shown in FIG. 11B, the gripping of the lower fixing length portion 11 of the rotary drilling machine 61 is released as shown in FIG. 11C. Next, the upper blade portion 13 is connected to the upper end portion of the lower fixing length portion 11 as shown in FIG. Thereafter, as shown in FIG. 12 (B), the upper free length portion 12 held by the rotary drilling machine 61 is connected to the lower fixing length portion 11 by the joint of the upper blade portion 13, and after the connection is completed, the rotary press pile 10 is rotationally press-fitted by a predetermined stroke. When the press-fitting of the rotary press-fit pile 10 is completed as shown in FIG. 13A, the mouth of the upper free length portion 12 is closed with a valve 62 as shown in FIG. Is injected under pressure. By this pressure injection, the grout material is discharged from the plurality of grout material discharge holes 11c on the ground where the lower blade 11a is loosened, and a uniform grout column 31 is formed as shown in FIG. Power is obtained.
The above is an example of constructing the rotary press-fit pile 10 of the first embodiment, but the rotary press-fit piles of the second to fourth embodiments can be similarly constructed.

（Ｆ）第２の施工方法
図１４〜図１６は本発明の第２の施工方法説明図であり、大型の回転式削孔機械８１を用いて第１実施例の回転圧入杭１０を一気に施工する例である。第１実施例の回転圧入杭１０は図２で説明したように、下部定着長部１１と上部自由長部１２と上部羽根部１３の３つの部品を組み立てて構成されるが、第２の施工方法では下部定着長部１１と上部羽根付きの上部自由長部１２を準備する。
まず、図１４（Ａ）に示すように大型回転式削孔機械８１に下部定着長部１１を把持させて一気に回転圧入する。図１４（Ｂ）に示すように下部定着長部１１の圧入が終了すれば、図１５（Ａ）に示すように回転式削孔機械８１の回転押し付け部８１ａを上方に移動させ、ついで、図１５（Ｂ）に示すように上部羽根付きの上部自由長部１２を下部定着長部１１に接続する。ついで、図１６（Ａ）に示すように回転式削孔機械８１の回転押し付け部８１ａで上部自由長部１２を押し付けながら回転させて回転圧入杭１０を一気に回転圧入する。回転圧入杭１０の圧入が終了すれば、図１６（Ｂ）に示すように上部自由長部１２の口元をバルブ６２で塞いでグラウト注入装置７１よりグラウトを加圧注入する。この加圧注入により、下部羽根１１ａが緩ませた地盤にグラウト材が複数のグラウト材吐出孔１１ｃより排出し、図６に示すように均一なグラウト柱体３１が形成され、これによって確実な支持力が得られる。
以上は第１実施例の回転圧入杭１０を施工する例であるが、同様に第２〜第４実施例の回転圧入杭を施工することができる。 (F) Second Construction Method FIGS. 14 to 16 are explanatory diagrams of the second construction method of the present invention, and the rotary press-in pile 10 of the first embodiment is constructed at once using a large rotary drilling machine 81. This is an example. As described with reference to FIG. 2, the rotary press-fit pile 10 of the first embodiment is constructed by assembling three parts of the lower fixing length portion 11, the upper free length portion 12, and the upper blade portion 13, but the second construction In the method, a lower fixing length 11 and an upper free length 12 with an upper blade are prepared.
First, as shown in FIG. 14A, the large rotary drilling machine 81 is made to grip the lower fixing length 11 and is rotationally pressed at once. When the press-fitting of the lower fixing length portion 11 is completed as shown in FIG. 14B, the rotary pressing portion 81a of the rotary drilling machine 81 is moved upward as shown in FIG. As shown in FIG. 15B, the upper free length portion 12 with the upper blade is connected to the lower fixing length portion 11. Next, as shown in FIG. 16 (A), the rotary press-fitting pile 10 is rotated and pressed at a stretch by rotating the upper free length portion 12 while pressing it with the rotary pressing portion 81a of the rotary drilling machine 81. When the press-fitting of the rotary press-fitting pile 10 is finished, the mouth of the upper free length portion 12 is closed with a valve 62 as shown in FIG. By this pressure injection, the grout material is discharged from the plurality of grout material discharge holes 11c on the ground where the lower blade 11a is loosened, and a uniform grout column 31 is formed as shown in FIG. Power is obtained.
The above is an example of constructing the rotary press-fit pile 10 of the first embodiment, but the rotary press-fit piles of the second to fourth embodiments can be similarly constructed.

第１実施例の回転圧入杭の正面図である。It is a front view of the rotation press fit pile of the 1st example. 第１実施例の回転圧入杭の組み立て説明図である。It is assembly explanatory drawing of the rotation press fit pile of 1st Example. 下部羽根部の説明図である。It is explanatory drawing of a lower blade | wing part. 節突起の説明図である。It is explanatory drawing of a node protrusion. 逆止弁機構付きグラウト材吐出孔の説明図である。It is explanatory drawing of the grout material discharge hole with a non-return valve mechanism. 回転圧入杭を地盤に施工した状態を示す説明図である。It is explanatory drawing which shows the state which constructed the rotary press-fit pile in the ground. 第２実施例の回転圧入杭を地盤に施工した状態を示す説明図である。It is explanatory drawing which shows the state which constructed the rotary press-fit pile of 2nd Example on the ground. 第３実施例の回転圧入杭を地盤に施工した状態を示す説明図である。It is explanatory drawing which shows the state which constructed the rotary press-fit pile of 3rd Example on the ground. 第４実施例の回転圧入杭の説明図である。It is explanatory drawing of the rotary press-fit pile of 4th Example. グラウト材により第４実施例の袋体が膨らんだ状態の説明図である。It is explanatory drawing of the state which the bag body of 4th Example swelled with the grout material. 本発明の第１の施工方法説明図（その１）である。It is 1st construction method explanatory drawing (the 1) of this invention. 本発明の第１の施工方法説明図（その２）である。It is the 1st construction method explanatory drawing (the 2) of this invention. 本発明の第１の施工方法説明図（その３）である。It is the 1st construction method explanatory drawing (the 3) of this invention. 本発明の第２の施工方法説明図（その１）である。It is the 2nd construction method explanatory view (the 1) of the present invention. 本発明の第２の施工方法説明図（その２）である。It is the 2nd construction method explanatory view (the 2) of the present invention. 本発明の第２の施工方法説明図（その３）である。It is the 2nd construction method explanatory view (the 3) of the present invention.

符号の説明Explanation of symbols

１１ 下部定着長部
１２ 上部自由長部
１３ 上部羽根部
１１ａ 下部羽根部
１１ｂ 節突起
１１ｃ 逆止弁機構付きグラウト材吐出孔 11 Lower fixing length portion 12 Upper free length portion 13 Upper blade portion 11a Lower blade portion 11b Node protrusion 11c Grout material discharge hole with check valve mechanism

Claims (6)

回転させながら地盤に圧入される回転圧入杭において、
先端に螺旋状の下部羽根を設けた鋼管抗本体の周壁に、グラウト材吐出孔を該鋼管抗本体の長さ方向に複数個散在して有し、かつ、
前記鋼管抗本体の長さ方向所定ピッチ毎に節突起を有する、
ことを特徴とする回転圧入杭。 In rotating press piles that are pressed into the ground while rotating,
The peripheral wall of the steel pipe anti-body provided with a spiral lower blade at the tip has a plurality of grout material discharge holes scattered in the length direction of the steel pipe anti-body, and
Having a node projection for each predetermined pitch in the length direction of the steel pipe anti-main body,
This is a rotary press-fit pile. 前記鋼管杭本体における定着長部の上端に前記下部羽根より大径の上部羽根を有する、
ことを特徴とする請求項１記載の回転圧入杭。 The upper end of the fixing length in the steel pipe pile main body has an upper blade having a larger diameter than the lower blade,
The rotary press-fitting pile according to claim 1. 前記下部羽根と前記上部羽根との間に第３の羽根を１段以上有する、
ことを特徴とする請求項２記載の回転圧入杭。 Having one or more third blades between the lower blade and the upper blade;
The rotary press-fitting pile according to claim 2. 前記下部羽根より上側の鋼管本体を被覆する袋体を有する、
ことを特徴とする請求項１または２記載の回転圧入杭。 Having a bag covering the steel pipe body above the lower blade,
The rotary press-fitting pile according to claim 1 or 2. 請求項１乃至４記載の回転圧入杭の施工方法において、
回転圧入杭を回転圧入して地中に打設し、
該回転圧入杭の鋼管本体内にグラウト材を加圧注入し、
前記グラウト材吐出孔よりグラウト材を排出して定着長部を形成する、
ことを特徴とする回転圧入杭の施工方法。 In the construction method of the rotary press-fit pile according to claim 1 to 4,
Rotating and press-fitting a rotary press-fit pile into the ground,
Injecting grout material into the steel pipe body of the rotary press-fit pile,
The fixing material is formed by discharging the grout material from the grout material discharge hole,
The construction method of the rotary press-fit pile characterized by this. 請求項１乃至４記載の回転圧入杭の施工方法において、
回転圧入杭を回転圧入して地中に打設しながら、該回転圧入杭の鋼管本体内にグラウト材を加圧注入し、
グラウト材吐出孔よりグラウト材を排出して定着長部を形成する、
ことを特徴とする回転圧入杭の施工方法。 In the construction method of the rotary press-fit pile according to claim 1 to 4,
While rotating and pressing the rotary press pile, placing the grout material into the steel pipe body of the rotary press pile,
The grout material is discharged from the grout material discharge hole to form a fixing length portion.
The construction method of the rotary press-fit pile characterized by this.
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JP2011196023A (en) * 2010-03-17 2011-10-06 Asahi Kasei Construction Materials Co Ltd Pile construction method, pile construction device, and pile for ground construction
JP2013155485A (en) * 2012-01-26 2013-08-15 Kfc Ltd Ground reinforcement structure and method of forming the same
CN105220687A (en) * 2014-06-30 2016-01-06 中国一冶集团有限公司 Prestressed concrete pipe pile grouting behind shaft or drift lining method fills with core reinforcing construction method
KR101970992B1 (en) * 2018-10-29 2019-08-13 주식회사 대산시빌테크날러지 Non-displacement pile construction method therewith
CN110374500A (en) * 2019-07-16 2019-10-25 上海广大基础工程有限公司 A kind of drilling pile construction method in groups
CN113089505A (en) * 2021-04-26 2021-07-09 张金泉 Bridgehead grouting device for highway bridge engineering

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JP2011026911A (en) * 2009-07-29 2011-02-10 Kfc Ltd Construction method of rotary penetrating pile
JP2011026910A (en) * 2009-07-29 2011-02-10 Kfc Ltd Rotary penetrating pile
JP2011069072A (en) * 2009-09-24 2011-04-07 Ohbayashi Corp Structure and method for coupling steel pipes for steel pipe pile
JP2011196023A (en) * 2010-03-17 2011-10-06 Asahi Kasei Construction Materials Co Ltd Pile construction method, pile construction device, and pile for ground construction
JP2013155485A (en) * 2012-01-26 2013-08-15 Kfc Ltd Ground reinforcement structure and method of forming the same
CN105220687A (en) * 2014-06-30 2016-01-06 中国一冶集团有限公司 Prestressed concrete pipe pile grouting behind shaft or drift lining method fills with core reinforcing construction method
KR101970992B1 (en) * 2018-10-29 2019-08-13 주식회사 대산시빌테크날러지 Non-displacement pile construction method therewith
CN110374500A (en) * 2019-07-16 2019-10-25 上海广大基础工程有限公司 A kind of drilling pile construction method in groups
CN113089505A (en) * 2021-04-26 2021-07-09 张金泉 Bridgehead grouting device for highway bridge engineering
CN113089505B (en) * 2021-04-26 2022-05-20 张金泉 Bridgehead grouting device for highway bridge engineering

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