JP2005299191A - Rotary press-in pile - Google Patents

Rotary press-in pile Download PDF

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JP2005299191A
JP2005299191A JP2004115985A JP2004115985A JP2005299191A JP 2005299191 A JP2005299191 A JP 2005299191A JP 2004115985 A JP2004115985 A JP 2004115985A JP 2004115985 A JP2004115985 A JP 2004115985A JP 2005299191 A JP2005299191 A JP 2005299191A
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pile
bit
bits
ground
end surface
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Kenji Yoshida
憲司 吉田
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SOIENSU KK
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SOIENSU KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary press-in pile further facilitating penetration work into the ground. <P>SOLUTION: A steel pipe pile 10 is provided with a pair of bits 13A, 13B of plate shape projected downward from a lower end face 11a of a pipe body 11. A cutting face 14 of each of the bits 13A, 13B forms an acute angle α to an orthogonal line P to a straight line Q extending forward in the rotating direction of the pipe body 11 from an intersection T of the cutting face 14 and the straight line Q intersecting an axis Z of the pipe body 11, on the outside of the orthogonal line P. Each of the bits 13A, 13B has a guide face 15 continuous with the cutting face 14 and facing the axis Z side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、先端にビットを設けた回転圧入杭に関するものである。   The present invention relates to a rotary press-fit pile provided with a bit at the tip.

従来、この種の回転圧入杭としては、特許文献１に開示されるものが提案されている。すなわち、特許文献１に記載された回転圧入杭８０は、図１０に示すように、その下端面８０ａに、一対の平板状の爪８１，８２が、異なる位置において互いに平行となるように、かつ、その軸心Ｚを中心とする点対称となるように配設されている。そして、杭８０が回転されながら地盤に対して押圧されると、各爪８１，８２が地盤に食い込んで地盤を削る。この杭においては、各爪８１，８２の削面８１ａ，８２ａが、杭本体の軸線Ｚに直交する平面上において、軸心Ｚに交差する直線Ｑと削面８１ａ，８２ａとの交点Ｔから杭本体の回転方向前方に延びる直線Ｑとの直交線Ｐに対し、該直交線Ｐの外側において鈍角θをなしている。このため、各爪８１，８２の削面８１ａ，８２ａによって削られた土は、各削面８１ａ，８２ａに沿って下端面８０ａの中心側から外周側に移動される。この結果、杭８０の下端面８０ａ下側の地盤が掘削され、杭８０が地盤に貫入される。
特開平７−１７３８３２号公報 Conventionally, what is disclosed by patent document 1 is proposed as this kind of rotary press-fit pile. That is, as shown in FIG. 10, the rotary press-fit pile 80 described in Patent Document 1 has a pair of plate-like claws 81 and 82 parallel to each other at different positions on the lower end surface 80a, and These are arranged so as to be point-symmetric about the axis Z. And if the pile 80 is pressed with respect to the ground while rotating, each nail | claw 81,82 will dig into the ground and cuts the ground. In this pile, the cut surfaces 81a, 82a of the claws 81, 82 are on the plane perpendicular to the axis Z of the pile body from the intersection T between the straight line Q intersecting the axis Z and the cut surfaces 81a, 82a. An obtuse angle θ is formed outside the orthogonal line P with respect to the orthogonal line P to the straight line Q extending forward in the rotational direction. For this reason, the soil cut by the cut surfaces 81a and 82a of the claws 81 and 82 is moved from the center side of the lower end surface 80a to the outer peripheral side along the cut surfaces 81a and 82a. As a result, the ground below the lower end surface 80a of the pile 80 is excavated, and the pile 80 penetrates into the ground.
JP 7-173832 A

しかしながら、前記従来の杭８０では、各爪８１，８２が地盤に対してブルドーザのブレードのように当たって地盤を削り、削った土をそのまま外周側に無理に押し出すだけであるため、杭８０の回転に大きなトルクを要する。このため、下端面８０ａ下側の地盤を効率良く掘削することができず、杭８０の貫入作業に時間を要していた。   However, in the conventional pile 80, the claws 81 and 82 hit the ground like a bulldozer blade, and the ground is shaved, and the shaved soil is pushed out to the outer peripheral side as it is. Requires large torque. For this reason, the ground below the lower end surface 80a could not be excavated efficiently, and it took time to penetrate the pile 80.

本発明の目的は、地盤への貫入作業をより容易に行うことができる回転圧入杭を提供することにある。   The objective of this invention is providing the rotary press-fit pile which can perform the penetration | penetration operation | work to a ground more easily.

上記目的を達成するため、請求項１に記載の発明は、杭本体の下端面から下方に突出する複数の掘削用ビットを備えた回転圧入杭であって、前記ビットの削面は、前記杭本体の軸心に直交する平面上において、前記杭本体の軸心を通る直線と該削面との交点から杭本体の回転方向前方に延びる前記直線との直交線に対し、該直交線の外側において鋭角をなしていることを特徴とする。なお、「直交線の外側」とは、直交線に対し、軸心の側とは反対側を意味する。   In order to achieve the above object, the invention described in claim 1 is a rotary press-fit pile including a plurality of excavation bits protruding downward from a lower end surface of the pile body, wherein the cutting surface of the bit is the pile body. An acute angle outside the orthogonal line with respect to an orthogonal line between a straight line passing through the axis of the pile body and the straight line extending forward in the rotational direction of the pile body from the intersection of the cut surface on a plane perpendicular to the axis of the pile body It is characterized by. The “outside of the orthogonal line” means the side opposite to the axis side with respect to the orthogonal line.

請求項２に記載の発明は、請求項１に記載の発明において、前記ビットは平板状をなすことを特徴とする。
従って、請求項１または請求項２に記載の発明によれば、ビットの削面によって地盤から削られた土が、杭の下端面における外周側から中心側に一旦移動される。中心側に移動された土は、ビットから外れた後、中心側から再び外周側に移動されて押し出される。このような作用になす構成により、地盤がより効率良く掘削される。 According to a second aspect of the present invention, in the first aspect of the present invention, the bit has a flat plate shape.
Therefore, according to the invention described in claim 1 or claim 2, the soil cut from the ground by the cutting surface of the bit is once moved from the outer peripheral side to the center side on the lower end surface of the pile. The soil moved to the center side is removed from the bit and then moved again from the center side to the outer peripheral side and pushed out. The structure excavating in this way allows the ground to be excavated more efficiently.

請求項３に記載の発明は、請求項２に記載の発明において、前記ビットは、その基端側に前記削面に続く案内面を有していることを特徴とする。
従って、請求項３に記載の発明によれば、ビットの削面によって地盤から削られた土は、削面に続く案内面に沿って下端面の外周側に移動され、地盤がさらに効率良く掘削される。 According to a third aspect of the present invention, in the second aspect of the present invention, the bit has a guide surface following the cut surface on the base end side.
Therefore, according to the invention described in claim 3, the soil cut from the ground by the cutting surface of the bit is moved to the outer peripheral side of the lower end surface along the guide surface following the cutting surface, and the ground is excavated more efficiently. .

請求項４に記載の発明は、請求項２又は請求項３に記載の発明において、前記ビットは、その先端が前記杭本体の下端面の外周から突出することを特徴とする。
従って、請求項４に記載の発明によれば、下端面の外周から外周側に突出するビットにより、地盤の杭本体の外周側部分を解すことができ、地盤に対する杭本体の外周面の摩擦力を向上することができる。 The invention according to claim 4 is the invention according to claim 2 or 3, wherein the tip of the bit protrudes from the outer periphery of the lower end surface of the pile body.
Therefore, according to the fourth aspect of the present invention, the outer peripheral side portion of the pile main body of the ground can be solved by the bit protruding from the outer periphery of the lower end surface to the outer peripheral side, and the frictional force of the outer peripheral surface of the pile main body against the ground Can be improved.

請求項５に記載の発明は、請求項１〜請求項４のいずれか一項に記載の発明において、前記杭本体の下端面の中央には、下方に突出する中央ビットが設けられていることを特徴とする。   The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein a central bit protruding downward is provided at the center of the lower end surface of the pile body. It is characterized by.

従って、請求項５に記載の発明によれば、中央ビットにより、下端面中央部に面する地盤が掘削されるので、前記ビットの削面によって地盤から削られた土が、下端面の外周側から中心側により効率良く移動される。このため、地盤がより効率良く掘削される。   Therefore, according to the fifth aspect of the present invention, since the ground facing the center portion of the lower end surface is excavated by the central bit, the soil cut from the ground by the cutting surface of the bit is removed from the outer peripheral side of the lower end surface. It is moved more efficiently by the center side. For this reason, the ground is excavated more efficiently.

本発明によれば、ビットによって地盤から削られた土が、ビットの削面に沿って杭本体の外周側に押し出される。このため、地盤をより効率良く掘削することができ、地盤に対する回転圧入杭の貫入作業をより容易に行うことができる。   According to the present invention, the soil cut from the ground by the bit is pushed out to the outer peripheral side of the pile body along the cut surface of the bit. For this reason, the ground can be excavated more efficiently, and the penetration work of the rotary press-fit pile to the ground can be performed more easily.

（第１実施形態）
次に、本発明の回転圧入杭を鋼管杭に具体化した第１実施形態を図１〜図３に従って説明する。 (First embodiment)
Next, 1st Embodiment which actualized the rotary press-fit pile of this invention to the steel pipe pile is described according to FIGS. 1-3.

図２（ａ），（ｂ）に示すように、鋼管杭１０は、杭本体としての管体１１を備え、管体１１の先端（下端）には底板１２が固定されている。底板１２の下面によって管体１１の下端面１１ａが形成されている。下端面１１ａには、内側面を削面１４とした一対のビット１３Ａ，１３Ｂが固着され、その削面１４が下端面１１ａに対して直角をなしている。   As shown in FIGS. 2A and 2B, the steel pipe pile 10 includes a pipe body 11 as a pile body, and a bottom plate 12 is fixed to the tip (lower end) of the pipe body 11. A lower end surface 11 a of the tubular body 11 is formed by the lower surface of the bottom plate 12. A pair of bits 13A and 13B having an inner surface as a cutting surface 14 are fixed to the lower end surface 11a, and the cutting surface 14 is perpendicular to the lower end surface 11a.

図１，２に示すように、前記一対のビット１３Ａ，１３Ｂは同一形状、同一大きさの平板よりなり、それら一対のビット１３Ａ，１３Ｂは、互いに平行となるように配設されるとともに、管体１１の軸心Ｚを中心として点対称となる位置に配設されている。   As shown in FIGS. 1 and 2, the pair of bits 13A and 13B are made of flat plates having the same shape and the same size, and the pair of bits 13A and 13B are arranged so as to be parallel to each other, and It is arranged at a position that is point-symmetric about the axis Z of the body 11.

また、各ビット１３Ａ，１３Ｂは、下端面１１ａの直径Ｒに対し約半分の長さＬ（＝Ｒ／２）を有している。そして、両ビット１３Ａ，１３Ｂは、その長さ方向においてＬ／２だけ重なるように配設されている。また、両ビット１３Ａ，１３Ｂは、削面１４間の距離が、下端面１１ａの直径Ｒの半分Ｒ／２となる位置に配設されている。また、各ビット１３Ａ，１３Ｂの高さＨは一定である。   Each of the bits 13A and 13B has a length L (= R / 2) that is approximately half of the diameter R of the lower end surface 11a. Both bits 13A and 13B are arranged so as to overlap by L / 2 in the length direction. Further, both the bits 13A and 13B are disposed at a position where the distance between the cut surfaces 14 is half R / 2 of the diameter R of the lower end surface 11a. Further, the height H of each bit 13A, 13B is constant.

さらに、各ビット１３Ａ，１３Ｂは、その先端が下端面１１ａの外周から外周側に突出されている。但し、各ビット１３Ａ，１３Ｂの先端が下端面１１ａの外周から突出する量Ｓは、下端面１１ａの直径Ｒの５％程度とされている。   Further, the tips of the respective bits 13A and 13B protrude from the outer periphery of the lower end surface 11a to the outer peripheral side. However, the amount S that the tip of each bit 13A, 13B protrudes from the outer periphery of the lower end surface 11a is about 5% of the diameter R of the lower end surface 11a.

各ビット１３Ａ，１３Ｂの削面１４は、管体１１の軸心Ｚに直交する平面上において、軸心Ｚに交差する直線Ｑとの交点Ｔから管体１１の回転方向前方に延びる直線Ｑとの直交線Ｐに対し、該直交線Ｐの外側において鋭角αをなしている。なお、直交線Ｐの外側とは、直交線Ｐに対し、軸心Ｚの側とは反対側を意味する。この鋭角αは、３０度〜６０度の範囲内の値が設定される。また、各ビット１３Ａ，１３Ｂは、その基端側に削面１４に同一平面上で続く案内面１５を有している。この案内面１５は、図１に示す二点鎖線を境にして点対称位置に配設されている。従って、案内面１５とは、削面１４に対して直交する半径線を介して削面１４の反対側に位置する面をいう。   The cut surface 14 of each bit 13A, 13B is on a plane perpendicular to the axis Z of the tube body 11 and a straight line Q extending forward in the rotation direction of the tube body 11 from the intersection T with the line Q intersecting the axis Z. With respect to the orthogonal line P, an acute angle α is formed outside the orthogonal line P. Note that the outside of the orthogonal line P means the opposite side of the orthogonal line P to the axis Z side. The acute angle α is set to a value within a range of 30 degrees to 60 degrees. Moreover, each bit 13A, 13B has the guide surface 15 which continues on the same surface to the cutting surface 14 in the base end side. The guide surface 15 is disposed at a point-symmetrical position with respect to the two-dot chain line shown in FIG. Therefore, the guide surface 15 is a surface located on the opposite side of the cutting surface 14 via a radial line orthogonal to the cutting surface 14.

次に、以上のように構成された本実施形態の作用について説明する。
鋼管杭１０を地中に埋設する際には、施工装置（図示略）により鋼管杭１０を地面に直立させ、この状態で鋼管杭１０に対し図１の矢印Ｆ方向の回転力を与えるとともに下向きの押圧力を与える。すると、両ビット１３Ａ，１３Ｂの削面１４によって下端面１１ａ下方の地盤が掘削され、鋼管杭１０が徐々に地盤に貫入される。 Next, the operation of the present embodiment configured as described above will be described.
When embedding the steel pipe pile 10 in the ground, the steel pipe pile 10 is brought upright on the ground by a construction device (not shown), and in this state, the steel pipe pile 10 is given a rotational force in the direction of arrow F in FIG. Give a pressing force of. Then, the ground below the lower end surface 11a is excavated by the cutting surfaces 14 of both the bits 13A and 13B, and the steel pipe pile 10 is gradually penetrated into the ground.

すなわち、鋼管杭１０の押圧に伴って、両ビット１３Ａ，１３Ｂが地盤に食い込み、鋼管杭１０の回転に伴って、地盤が各ビット１３Ａ，１３Ｂの削面１４によって削られる。このとき、各ビット１３Ａ，１３Ｂの削面１４によって削られた土は、鋼管杭１０の回転に伴い、図３に矢印Ｊ１，Ｊ２で示すように、ビット１３Ａ，１３Ｂの削面１４及び案内面１５に沿って移動され、下端面１１ａの外周側から外方へ移動される。これは、ビット１３Ａ，１３Ｂの削面１４が、管体１１の軸心Ｚに直交する平面上において、軸心Ｚに交差する直線Ｑとの交点Ｔから管体１１の回転方向に延びる直線Ｑとの直交線Ｐに対し、該直交線Ｐの外側において鋭角αをなしているためである。このとき、案内面１５は、土を矢印Ｊ１，Ｊ２方向へ案内する補助を行う。この結果、鋼管杭１０の回転圧入に伴って、下端面１１ａ下方の地盤が両ビット１３Ａ，１３Ｂにより連続的に掘削され、鋼管杭１０が次第に地盤中に貫入される。ちなみに、鋭角αが大きくなると、掘削力は大きくなるが、回転に要するトルクも大きくなり、鋭角αが小さくなると、この逆となる。従って、実施形態のように、鋭角αは、３０度〜６０度の範囲内が好ましい。   That is, as the steel pipe pile 10 is pressed, both the bits 13A and 13B bite into the ground, and the ground is scraped by the cut surface 14 of each bit 13A and 13B as the steel pipe pile 10 rotates. At this time, the soil cut by the cutting surface 14 of each bit 13A, 13B is transferred to the cutting surface 14 and the guide surface 15 of the bits 13A, 13B as indicated by arrows J1, J2 in FIG. Along the outer periphery of the lower end surface 11a. This is because the cutting surface 14 of the bits 13A and 13B is a straight line Q extending in the rotation direction of the tubular body 11 from the intersection T with the straight line Q intersecting the axial center Z on a plane orthogonal to the axial center Z of the tubular body 11. This is because an acute angle α is formed on the outer side of the orthogonal line P. At this time, the guide surface 15 assists in guiding the soil in the directions of arrows J1 and J2. As a result, with the rotary press-fitting of the steel pipe pile 10, the ground below the lower end surface 11a is continuously excavated by both the bits 13A and 13B, and the steel pipe pile 10 is gradually penetrated into the ground. Incidentally, when the acute angle α increases, the excavation force increases, but the torque required for rotation also increases, and when the acute angle α decreases, the reverse is true. Therefore, as in the embodiment, the acute angle α is preferably within a range of 30 degrees to 60 degrees.

以上のように構成された本実施形態によれば、従来とは異なり、ビット１３Ａ，１３Ｂの削面１４が、管体１１の軸心Ｚに交差する直線Ｑとの交点Ｔから管体１１の回転方向に延びる直線Ｑとの直交線Ｐに対し、該直交線Ｐの外側において鋭角αをなしている。このため、管体１１の下端面１１ａの地盤がより効率良く掘削され、鋼管杭１０を地盤に容易に貫入させることができることが確認された。この理由としては、以下のことが考えられる。すなわち、本実施形態の鋼管杭１０においては、軸心Ｚに直交する平面上において、軸心Ｚに交差する直線Ｑとの交点Ｔから回転方向前方に延びる直線Ｑとの直交線Ｐに対し、直交線Ｐの外側において鋭角αをなす削面１４によって地盤が削られる。そして、ビット１３Ａ，１３Ｂの回転方向前方側の部分によって削られた土は、削面１４及び案内面１５に沿ってビット１３Ａ，１３Ｂの回転方向後方側へ移動され、管体１１の外周側に円滑に押し出される。また、削面１４が前記の鋭角αをなしているため、管体１１の回転に伴い、ビット１３Ａ，１３Ｂが掘削域の周囲を回るように移動する。このため、図１０に示す従来構成とは異なり、大きな回転トルクは必要ない。この結果、掘削が効率良く行われると考えられる。   According to the present embodiment configured as described above, unlike the prior art, the cutting surface 14 of the bits 13A and 13B rotates the tube 11 from the intersection T with the straight line Q intersecting the axis Z of the tube 11. An acute angle α is formed outside the orthogonal line P with respect to the orthogonal line P to the straight line Q extending in the direction. For this reason, it was confirmed that the ground of the lower end surface 11a of the tubular body 11 was excavated more efficiently, and the steel pipe pile 10 could be easily penetrated into the ground. The reason is considered as follows. That is, in the steel pipe pile 10 of this embodiment, on the plane orthogonal to the axis Z, with respect to the orthogonal line P with the straight line Q extending forward in the rotational direction from the intersection T with the straight line Q intersecting the axis Z, The ground is cut by the cut surface 14 having an acute angle α outside the orthogonal line P. Then, the soil cut by the portion on the front side in the rotation direction of the bits 13A and 13B is moved to the rear side in the rotation direction of the bits 13A and 13B along the cutting surface 14 and the guide surface 15, and smoothly on the outer peripheral side of the tubular body 11. Extruded. Moreover, since the cut surface 14 has the acute angle α, the bits 13A and 13B move so as to go around the excavation area as the tube body 11 rotates. Therefore, unlike the conventional configuration shown in FIG. 10, a large rotational torque is not necessary. As a result, excavation is considered to be performed efficiently.

また、本実施形態では、各ビット１３Ａ，１３Ｂの先端が、下端面１１ａの外周から、下端面１１ａの直径Ｒに対する約５％の量Ｓだけ突出するようにした。この各ビット１３Ａ，１３Ｂの突出量が直径Ｒの５％を大きく超えると、掘削時における地盤との間の摩擦抵抗が大きくなって、掘削効率が低下する。また、突出量が５％を大きく下回ると、掘削力そのものが低下する。   In the present embodiment, the tips of the respective bits 13A and 13B protrude from the outer periphery of the lower end surface 11a by an amount S of about 5% with respect to the diameter R of the lower end surface 11a. When the protruding amount of each of the bits 13A and 13B greatly exceeds 5% of the diameter R, the frictional resistance with the ground during excavation increases and the excavation efficiency decreases. Further, when the protruding amount is significantly less than 5%, the excavation force itself is reduced.

（第２実施形態）
次に、本発明を具体化した第２実施形態を図４に従って説明する。なお、本実施形態は、中央ビット２０を設けたことのみが第１実施形態と異なるため、中央ビット２０についてのみ詳述する。 (Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Note that this embodiment is different from the first embodiment only in that the central bit 20 is provided, and therefore only the central bit 20 will be described in detail.

図４に示すように、鋼管杭１０の下端面１１ａの中心には、一対のビット１３Ａ，１３Ｂの中間に、中央ビット２０が固着されている。この中央ビット２０は、両ビット１３Ａ，１３Ｂとほぼ同一形状、同一大きさの平板よりなる。中央ビット２０は、両ビット１３Ａ，１３Ｂと平行となるように配設されている。また、中央ビット２０は、両ビット１３Ａ，１３Ｂの高さＨよりも高い一定の高さＨ２を有している。   As shown in FIG. 4, the center bit 20 is fixed to the center of the lower end surface 11a of the steel pipe pile 10 in the middle of the pair of bits 13A and 13B. The central bit 20 is formed of a flat plate having substantially the same shape and the same size as both the bits 13A and 13B. The central bit 20 is disposed so as to be parallel to both the bits 13A and 13B. The central bit 20 has a constant height H2 higher than the height H of both bits 13A and 13B.

さて、鋼管杭１０が回転及び押圧されると、中央ビット２０及び両ビット１３Ａ，１３Ｂにより鋼管杭１０の下端面１１ａ下方の地盤が掘削される。すなわち、鋼管杭１０の押圧に伴い、中央ビット２０が両ビット１３Ａ，１３Ｂに先立って下端面１１ａ中央部に面する地盤に食い込む。さらに、鋼管杭１０の回転に伴って、中央ビット２０によって下端面１１ａ中央部に面する地盤が破砕される。また、鋼管杭１０の圧入回転に伴って、両ビット１３Ａ，１３Ｂにより、中央ビット２０によって破砕された地盤の周囲の地盤が破砕される。   Now, when the steel pipe pile 10 is rotated and pressed, the ground below the lower end surface 11a of the steel pipe pile 10 is excavated by the central bit 20 and both bits 13A and 13B. That is, with the pressing of the steel pipe pile 10, the central bit 20 bites into the ground facing the central portion of the lower end surface 11a prior to both the bits 13A and 13B. Furthermore, with the rotation of the steel pipe pile 10, the ground facing the central portion of the lower end surface 11 a is crushed by the central bit 20. Further, with the press-fitting rotation of the steel pipe pile 10, the ground around the ground crushed by the central bit 20 is crushed by both the bits 13A and 13B.

このとき、両ビット１３Ａ，１３Ｂは、中央ビット２０が破砕した地盤の周囲の地盤を掘削することになるため、両ビット１３Ａ，１３Ｂの削面１４によって削られた土が、ビット１３Ａ，１３Ｂの削面１４及び案内面１５に沿って下端面１１ａの外周側へ効率良く移動される。従って、本実施形態においても、下端面１１ａ下方の地盤が効率良く掘削される。   At this time, since both the bits 13A and 13B excavate the ground around the ground crushed by the central bit 20, the soil cut by the cutting surface 14 of both the bits 13A and 13B is cut by the cutting surfaces of the bits 13A and 13B. 14 and the guide surface 15 are efficiently moved to the outer peripheral side of the lower end surface 11a. Therefore, also in this embodiment, the ground below the lower end surface 11a is excavated efficiently.

（第３実施形態）
次に、本発明を具体化した第３実施形態を図５に従って説明する。なお、本実施形態は、底板１２に代わる低円錐形の底板３０を設けたことと、これに伴ってビット１３Ａ，１３Ｂの固定側の形状を一部変更したことのみが第１実施形態と異なるため、底板３０及びビット１３Ａ，１３Ｂについてのみ詳述する。 (Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. Note that this embodiment differs from the first embodiment only in that a low conical bottom plate 30 is provided in place of the bottom plate 12 and the shape on the fixed side of the bits 13A and 13B is partially changed accordingly. Therefore, only the bottom plate 30 and the bits 13A and 13B will be described in detail.

図５に示すように、鋼管杭１０は、下方に突出する低円錐形の前述した底板３０を有している。底板３０の下面３０ａには、一対のビット１３Ａ，１３Ｂが固着されている。両ビット１３Ａ，１３Ｂは、円錐形の底板３０に合わせて、その固着側の形状が第１実施形態のものと変えられている。   As shown in FIG. 5, the steel pipe pile 10 has the above-mentioned bottom plate 30 of the low cone shape which protrudes below. A pair of bits 13 </ b> A and 13 </ b> B are fixed to the lower surface 30 a of the bottom plate 30. Both the bits 13A and 13B are changed in shape on the fixing side from those of the first embodiment in accordance with the conical bottom plate 30.

さて、本実施形態によれば、鋼管杭１０が地盤に貫入していくとき、円錐状の底板３０の頂部が地盤に食い込むため、鋼管杭１０の貫入方向が安定する。
（第４実施形態）
次に、本発明を具体化した第４実施形態を図６に従って説明する。なお、本実施形態は、２つのビット１３Ａ，１３Ｂに代えて４つのビット４０Ａ〜４０Ｄを設けたことと、各ビット４０Ａ〜４０Ｄが削面４１に続く案内面を有しないこととが第１実施形態と異なる。 Now, according to this embodiment, when the steel pipe pile 10 penetrates into the ground, since the top part of the conical bottom plate 30 bites into the ground, the penetration direction of the steel pipe pile 10 is stabilized.
(Fourth embodiment)
Next, a fourth embodiment embodying the present invention will be described with reference to FIG. In the first embodiment, four bits 40A to 40D are provided in place of the two bits 13A and 13B, and that each of the bits 40A to 40D does not have a guide surface following the cut surface 41. And different.

図６に示すように、鋼管杭１０の下端面１１ａには、同一形状、同一大きさからなる４つの平板状のビット４０Ａ，４０Ｂ，４０Ｃ，４０Ｄが９０°間隔で設けられている。４つのビット４０Ａ〜４０Ｄは、１８０度を隔てて位置するビット４０Ａ，４０Ｃ、４０Ｂ，４０Ｄ同士がそれぞれ互いに平行となるように配設されるとともに、同ビット４０Ａ，４０Ｃ、４０Ｂ，４０Ｄ同士がそれぞれ同軸心Ｚを中心とする点対称となるように配設されている。さらに、各ビット４０Ａ〜４０Ｄは、その先端が下端面１１ａの外周から外周側に突出するように配設されている。本実施形態のビット４０Ａ〜４０Ｄは、削面４１のみを有し、案内面を有していない。   As shown in FIG. 6, on the lower end surface 11a of the steel pipe pile 10, four flat bits 40A, 40B, 40C, 40D having the same shape and the same size are provided at 90 ° intervals. The four bits 40A to 40D are arranged so that the bits 40A, 40C, 40B, and 40D positioned at 180 degrees are parallel to each other, and the bits 40A, 40C, 40B, and 40D are respectively connected to each other. They are arranged so as to be point-symmetric about the coaxial center Z. Furthermore, each bit 40A-40D is arrange | positioned so that the front-end | tip may protrude to the outer peripheral side from the outer periphery of the lower end surface 11a. The bits 40 </ b> A to 40 </ b> D of the present embodiment have only the cut surface 41 and do not have a guide surface.

以上のように構成された本実施形態も、前記第１実施形態の効果を有する。
本発明は、前記各実施形態に限定されるものではなく、以下のように具体化してもよい。 The present embodiment configured as described above also has the effect of the first embodiment.
The present invention is not limited to the above embodiments, and may be embodied as follows.

・ 図７に示すように、各ビット１３Ａ，１３Ｂの下端面を、管体１１の外周側ほど高くなる構成としてもよい。
また、図８に示すように、各ビット１３Ａ，１３Ｂの下端面を、管体１１の内周側ほど高くなる構成としてもよい。 -As shown in FIG. 7, it is good also as a structure where the lower end surface of each bit 13A, 13B becomes high as the outer peripheral side of the tubular body 11. As shown in FIG.
Moreover, as shown in FIG. 8, it is good also as a structure where the lower end surface of each bit 13A, 13B becomes so high that the inner peripheral side of the tubular body 11. FIG.

・ 図９に示すように、管体１１の下端面１１ａに、３つの同一形状、同一大きさの平板状のビット５０Ａ，５０Ｂ，５０Ｃを、下端面１１ａの外周から外方へ突出しない状態で、軸心Ｚに対して１２０°間隔に点対称で配設した構成とする。各ビット５０Ａ〜５０Ｃは、その基端側に削面５１に続く案内面５２を有している。   As shown in FIG. 9, in the lower end surface 11 a of the tube body 11, three flat bits 50 A, 50 B, 50 C having the same shape and the same size are not projected outward from the outer periphery of the lower end surface 11 a. In addition, it is configured to be point-symmetrically arranged at 120 ° intervals with respect to the axis Z. Each bit 50 </ b> A to 50 </ b> C has a guide surface 52 following the cutting surface 51 on the base end side.

・ 底板１２，３０を設けることなく、その下端を開放した構成としてもよい。従って、ビットは、管体１１の下端縁に固着される。
・ 各ビット１３Ａ，１３Ｂ、４０Ａ〜４０Ｄは平板でなくてもよく、例えば回転方向前方側ほどより厚くなる、あるいは、回転方向後方側ほど薄くなるテーパ形状であってもよい。 -It is good also as a structure which opened the lower end, without providing the baseplates 12 and 30. FIG. Therefore, the bit is fixed to the lower end edge of the tube body 11.
Each of the bits 13A, 13B, 40A to 40D may not be a flat plate, and may be, for example, a tapered shape that becomes thicker toward the front side in the rotational direction or thinner toward the rear side in the rotational direction.

・ 前記第２実施形態で、中央ビット２０の高さを、両ビット１３Ａ，１３Ｂと同じ高さＨとしてもよい。
・ 前記第３、第４実施形態、及び、図７，８，９に示す各実施形態で、下端面１１ａの中央部に、前記中央ビット２０を設けた構成としてもよい。 In the second embodiment, the height of the central bit 20 may be the same height H as both the bits 13A and 13B.
In the third and fourth embodiments and the embodiments shown in FIGS. 7, 8, and 9, the central bit 20 may be provided at the center of the lower end surface 11a.

・ 各ビット１３Ａ，１３Ｂの削面１４は、図７に二点鎖線６１で示すように、軸心Ｚに直交する平面上において、管体１１の回転方向前方に向かって凸状に湾曲した構成であってもよい。または、図８に二点鎖線６２で示すように、軸心Ｚに直交する平面上において、各ビット１３Ａ，１３Ｂの削面１４は、管体１１の回転方向前方に向かって凹状に湾曲した構成であってもよい。すなわち、削面１４は、軸心Ｚに直交する平面上において、軸心Ｚに交差する直線Ｑと削面１４のある点との交点Ｔから回転方向に延びる直線Ｑとの直交線Ｐに対し、この直交線Ｐの外側において鋭角をなすのであれば、軸心Ｚに直交する平面上において湾曲した曲面であってもよい。   The cut surface 14 of each bit 13A, 13B is configured to be convexly convex toward the front in the rotational direction of the tubular body 11 on a plane orthogonal to the axis Z as indicated by a two-dot chain line 61 in FIG. There may be. Alternatively, as shown by a two-dot chain line 62 in FIG. 8, on the plane orthogonal to the axis Z, the ground surface 14 of each bit 13 </ b> A, 13 </ b> B is configured to be concavely curved toward the front in the rotational direction of the tube body 11. There may be. That is, on the plane orthogonal to the axis Z, the machined surface 14 is in relation to the orthogonal line P of the straight line Q extending in the rotational direction from the intersection T between the straight line Q intersecting the axis Z and a point on the machined surface 14. As long as an acute angle is formed outside the orthogonal line P, it may be a curved surface curved on a plane orthogonal to the axis Z.

・ 各ビット１３Ａ，１３Ｂの削面１４は、図７に二点鎖線６３で示すように、軸心Ｚに平行な平面上において、管体１１の回転方向前方に向かって下端側が傾いた構成であってもよい。または、図８に二点鎖線６４で示すように、軸心Ｚに平行な平面上において、管体１１の回転方向後方に向かって下端側が傾いた構成であってもよい。すなわち、削面１４は、軸心Ｚに直交する平面上において、軸心Ｚに交差する直線Ｑと削面１４のある点との交点Ｔから回転方向に延びる直線Ｑとの直交線Ｐに対し、この直交線Ｐの外側において鋭角をなすのであれば、軸心Ｚに対して平行な平面でなくてもよい。   The cutting surface 14 of each bit 13A, 13B has a configuration in which the lower end side is inclined toward the front in the rotation direction of the tube body 11 on a plane parallel to the axis Z as indicated by a two-dot chain line 63 in FIG. May be. Alternatively, as indicated by a two-dot chain line 64 in FIG. 8, a configuration in which the lower end side inclines toward the rear in the rotation direction of the tube body 11 on a plane parallel to the axis Z may be employed. That is, on the plane orthogonal to the axis Z, the machined surface 14 is in relation to the orthogonal line P of the straight line Q extending in the rotational direction from the intersection T between the straight line Q intersecting the axis Z and a point on the machined surface 14. As long as an acute angle is formed outside the orthogonal line P, the plane need not be parallel to the axis Z.

第１実施形態の鋼管杭を示す底面図。The bottom view which shows the steel pipe pile of 1st Embodiment. （ａ）は鋼管杭の下端部を示す側面図、（ｂ）は同じく別方向からの側面図。(A) is a side view which shows the lower end part of a steel pipe pile, (b) is a side view from another direction similarly. 掘削時における土の流れを示す模式図。The schematic diagram which shows the flow of the soil at the time of excavation. 第２実施形態の鋼管杭を示す三面図。The three-plane figure which shows the steel pipe pile of 2nd Embodiment. 第３実施形態の鋼管杭を示す三面図。The three-plane figure which shows the steel pipe pile of 3rd Embodiment. 第４実施形態の鋼管杭を示す三面図。The three-plane figure which shows the steel pipe pile of 4th Embodiment. 他の実施形態の鋼管杭を示す三面図。The three-plane figure which shows the steel pipe pile of other embodiment. 同じく鋼管杭を示す三面図。The three-sided figure which shows a steel pipe pile similarly. 同じく鋼管杭を示す三面図。The three-sided figure which shows a steel pipe pile similarly. 従来の回転圧入杭を示す底面図。The bottom view which shows the conventional rotary press fit pile.

符号の説明Explanation of symbols

１０…回転圧入杭としての鋼管杭、１１ａ…下端面、１１…杭本体としての管体、１３Ａ，１３Ｂ…ビット、１４…削面、１５…案内面、２０…中央ビット、４０Ａ，４０Ｂ，４０Ｃ，４０Ｄ…ビット、４１…削面、５０Ａ，５０Ｂ，５０Ｃ…ビット、５１…削面、５２…案内面、Ｐ…直交線、Ｑ…直線、Ｔ…交点、Ｚ…軸心、α…鋭角。   DESCRIPTION OF SYMBOLS 10 ... Steel pipe pile as rotary press-fit pile, 11a ... Lower end surface, 11 ... Pipe body as pile main body, 13A, 13B ... Bit, 14 ... Cutting surface, 15 ... Guide surface, 20 ... Center bit, 40A, 40B, 40C, 40D ... Bit, 41 ... Machining surface, 50A, 50B, 50C ... Bit, 51 ... Machining surface, 52 ... Guide surface, P ... Orthogonal line, Q ... Line, T ... Intersection, Z ... Axis center, α ... Acute angle.

Claims (5)

杭本体の下端面から下方に突出する複数の掘削用ビットを備えた回転圧入杭であって、
前記ビットの削面は、前記杭本体の軸心に直交する平面上において、前記軸心に交差する直線と該削面との交点から杭本体の回転方向前方に延びる前記直線との直交線に対し、該直交線の外側において鋭角をなしていることを特徴とする回転圧入杭。 A rotary press-fit pile with a plurality of excavation bits protruding downward from the lower end surface of the pile body,
The cutting surface of the bit is on a plane orthogonal to the axis of the pile body, and a line perpendicular to the straight line extending in the rotation direction of the pile body from the intersection of the straight line intersecting the axis and the cutting surface, A rotary press-fit pile having an acute angle outside the orthogonal line. 前記ビットは平板状をなすことを特徴とする請求項１に記載の回転圧入杭。   The rotary press-fit pile according to claim 1, wherein the bit has a flat plate shape. 前記ビットは、その基端側に前記削面に続く案内面を有していることを特徴とする請求項２に記載の回転圧入杭。   The rotary press-fit pile according to claim 2, wherein the bit has a guide surface following the cut surface on a base end side thereof. 前記ビットは、その先端が前記杭本体の下端面の外周から突出することを特徴とする請求項２又は請求項３に記載の回転圧入杭。   The rotary press-fit pile according to claim 2 or 3, wherein a tip of the bit protrudes from an outer periphery of a lower end surface of the pile body. 前記杭本体の下端面の中央には、下方に突出する中央ビットが設けられていることを特徴とする請求項１〜請求項４のいずれか一項に記載の回転圧入杭。   The rotary press-fit pile according to any one of claims 1 to 4, wherein a central bit protruding downward is provided at the center of the lower end surface of the pile body.
JP2004115985A 2004-04-09 2004-04-09 Rotary press-in pile Pending JP2005299191A (en)

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Cited By (3)

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WO2020184283A1 (en) * 2019-03-08 2020-09-17 日本製鉄株式会社 Steel pipe pile and method for installing steel pipe pile
WO2020184282A1 (en) * 2019-03-08 2020-09-17 日本製鉄株式会社 Steel pipe pile and method for installing steel pipe pile
JP2020172821A (en) * 2019-04-12 2020-10-22 日本製鉄株式会社 Steel pipe pile and construction method for steel pipe pile

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020184283A1 (en) * 2019-03-08 2020-09-17 日本製鉄株式会社 Steel pipe pile and method for installing steel pipe pile
WO2020184282A1 (en) * 2019-03-08 2020-09-17 日本製鉄株式会社 Steel pipe pile and method for installing steel pipe pile
JPWO2020184282A1 (en) * 2019-03-08 2021-11-18 日本製鉄株式会社 Construction method of steel pipe pile and steel pipe pile
JP7192963B2 (en) 2019-03-08 2022-12-20 日本製鉄株式会社 Steel pipe piles and construction methods for steel pipe piles
JP2020172821A (en) * 2019-04-12 2020-10-22 日本製鉄株式会社 Steel pipe pile and construction method for steel pipe pile
JP7277726B2 (en) 2019-04-12 2023-05-19 日本製鉄株式会社 Steel pipe piles and construction methods for steel pipe piles

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