JP2016048012A - Square columnar pile - Google Patents

Square columnar pile Download PDF

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JP2016048012A
JP2016048012A JP2014173740A JP2014173740A JP2016048012A JP 2016048012 A JP2016048012 A JP 2016048012A JP 2014173740 A JP2014173740 A JP 2014173740A JP 2014173740 A JP2014173740 A JP 2014173740A JP 2016048012 A JP2016048012 A JP 2016048012A
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pile
square columnar
columnar pile
cutting
square
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JP6408833B2 (en
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北村　精男
Morio Kitamura
北村　　精男
田内　宏明
Hiroaki Tauchi
田内　　宏明
勝彦 小野
Katsuhiko Ono
勝彦 小野
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Giken Seisakusho Co Ltd
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Giken Seisakusho Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a square columnar pile that is easy to bury underground.SOLUTION: A square columnar pile 11 including a through hole 11a into which an auger screw can be inserted has a cutting part 12 having a triangular cutting surface 12a at a corner part of the square columnar pile's bottom surface. Arranging one vertex 12b of the cutting surface 12a downward to make the cutting surface 12a's posture tilt from the one vertex 12b to the through hole 11a enables the cutting part 12 to cut an excavation hole antecedently excavated by the auger screw so that the excavation hole is extended to the size of a square columnar pile 10's bottom surface, thereby making it possible to easily bury the square columnar pile 10 underground.SELECTED DRAWING: Figure 1

Description

本発明は、四角柱状杭に関する。   The present invention relates to a square columnar pile.

従来、中空の四角柱状杭であるＰＣ（プレストレストコンクリート）壁体を中堀工法によって地中に鉛直向きに埋設し、複数のＰＣ壁体を並設することで擁壁等の土留め構造物を構築する技術が知られている（例えば、非特許文献１参照。）。
中堀工法とは、ＰＣ壁体の中空部に挿入したオーガスクリューによってＰＣ壁体の先端側の地盤を掘削しながら、そのＰＣ壁体を地中に埋設する工法である。 Conventionally, a retaining wall structure such as a retaining wall is constructed by embedding PC (prestressed concrete) walls, which are hollow square columnar piles, vertically in the ground using the Nakabori method, and arranging multiple PC walls in parallel. The technique to do is known (for example, refer nonpatent literature 1).
The Nakabori method is a method of burying the PC wall in the ground while excavating the ground on the tip side of the PC wall with an auger screw inserted into the hollow portion of the PC wall.

ＮＥＴＩＳ新技術情報提供システム、技術名称「ＰＣ−壁体」、登録番号「ＫＴ−９９００７７−Ｖ」、［平成２６年７月３１日検索］、インターネット＜ＵＲＬ：http://www.netis.mlit.go.jp/NetisRev/Search/NtDetail3.asp?REG_NO=KT-990077&TabType=2&nt=nt＞NETIS new technology information provision system, technology name “PC-wall”, registration number “KT-990077-V”, [searched on July 31, 2014], Internet <URL: http: //www.netis.mlit .go.jp / NetisRev / Search / NtDetail3.asp? REG_NO = KT-990077 & TabType = 2 & nt = nt>

しかしながら、上記従来技術の場合、杭体としてのＰＣ壁体２０は、中空部２０ａの内面から杭の外面までの厚みを有しているため、その厚みがあるほど杭の底面積が大きくなって圧入抵抗を受けるようになる。そして、例えば図９（ａ）（ｂ）に示すように、地中にＰＣ壁体２０を埋設する過程で杭の底面に圧密土Ｍが生じてしまうと、その杭の埋設が困難になることがある。   However, in the case of the above prior art, since the PC wall body 20 as a pile body has a thickness from the inner surface of the hollow portion 20a to the outer surface of the pile, the bottom area of the pile increases as the thickness increases. Receives press-fit resistance. And, for example, as shown in FIGS. 9A and 9B, if the compacted soil M is generated on the bottom surface of the pile in the process of burying the PC wall body 20 in the ground, it becomes difficult to bury the pile. There is.

本発明の目的は、地中に埋設しやすい四角柱状杭を提供することである。   An object of the present invention is to provide a square columnar pile that can be easily embedded in the ground.

以上の課題を解決するため、請求項１に記載の発明は、
オーガスクリューを挿通可能な貫通穴を有する四角柱状杭であって、
当該四角柱状杭の底面の角部には、三角形状の切削面を有する切削部が設けられ、前記切削面の一頂点が下方に向けて配されており、前記切削面は前記一頂点から前記貫通穴へ向かって傾斜していることを特徴とする。 In order to solve the above problems, the invention described in claim 1
A square columnar pile with a through hole through which an auger screw can be inserted,
A cutting portion having a triangular cutting surface is provided at a corner portion of the bottom surface of the square columnar pile, and one vertex of the cutting surface is arranged downward, and the cutting surface is from the one vertex to the above Inclined toward the through hole.

請求項２に記載の発明は、請求項１に記載の四角柱状杭において、
前記切削面の一頂点は、当該四角柱状杭の側面の交線を当該四角柱状杭の長手方向に沿って延在した仮想線上に位置していることを特徴とする。 The invention according to claim 2 is the quadrangular columnar pile according to claim 1,
One vertex of the cutting surface is located on an imaginary line extending along the longitudinal direction of the square columnar pile with the intersection line of the side surfaces of the square columnar pile.

本発明によれば、地中に埋設しやすい四角柱状杭が得られる。   According to the present invention, a square columnar pile that can be easily embedded in the ground is obtained.

本実施形態の四角柱状杭を示す側面図（ａ）と、その底面図（ｂ）である。It is the side view (a) which shows the square columnar pile of this embodiment, and its bottom view (b). 本実施形態の四角柱状杭を他の方向から見た側面図（ａ）と、その底面図（ｂ）である。They are the side view (a) which looked at the square columnar pile of this embodiment from the other direction, and the bottom view (b). 四角柱状杭の底面を拡大して示す斜視図（ａ）と、その側面図（ｂ）である。They are the perspective view (a) which expands and shows the bottom face of a square columnar pile, and the side view (b). 四角柱状杭の切削部を拡大して示す側面図（ａ）と、その底面図（ｂ）である。They are the side view (a) which expands and shows the cutting part of a square columnar pile, and the bottom view (b). 四角柱状杭を地中に埋設する過程を示す説明図（ａ）と、その四角柱状杭の底面図（ｂ）である。It is explanatory drawing (a) which shows the process of burying a square pillar pile in the ground, and a bottom view (b) of the square pillar pile. 四角柱状杭を地中に埋設する過程の他の実施形態を示す説明図（ａ）と、その四角柱状杭の底面図（ｂ）である。It is explanatory drawing (a) which shows other embodiment of the process of burying a square columnar pile in the ground, and the bottom view (b) of the square columnar pile. 切削部の変形例を示す側面図（ａ）と、底面図（ｂ）である。It is the side view (a) which shows the modification of a cutting part, and a bottom view (b). 切削部の変形例を示す側面図（ａ）と、底面図（ｂ）である。It is the side view (a) which shows the modification of a cutting part, and a bottom view (b). 従来の四角柱状杭（ＰＣ壁体）を地中に埋設する過程を示す説明図（ａ）と、その四角柱状杭の底面図（ｂ）である。It is explanatory drawing (a) which shows the process of embed | buying the conventional square columnar pile (PC wall body) in the ground, and the bottom view (b) of the square columnar pile.

以下、図面を参照して、本発明に係る四角柱状杭の実施形態について詳細に説明する。   Hereinafter, with reference to drawings, an embodiment of a square pillar pile concerning the present invention is described in detail.

本実施形態の四角柱状杭１０は、図１（ａ）（ｂ）、図２（ａ）（ｂ）に示すように、オーガスクリューを挿通可能な貫通穴１１ａが形成されている杭本体１１と、杭本体１１の底面の角部に設けられた切削部１２を備えている。
オーガスクリューＳ（図５参照）は、オーガ軸の周囲に螺旋状に設けられたスクリュー翼を有する周知の土木機械であり、その下端部にはオーガヘッドＨが交換可能に取り付けられている。オーガスクリューＳは、オーガスクリューＳの上端部に接続されているモータなどの駆動部（図示省略）によってオーガ軸を軸心にして回転されるようになっている。 As shown in FIGS. 1 (a), 1 (b), 2 (a) and 2 (b), the rectangular columnar pile 10 of the present embodiment includes a pile body 11 in which a through hole 11a into which an auger screw can be inserted is formed. The cutting part 12 provided in the corner | angular part of the bottom face of the pile main body 11 is provided.
The auger screw S (see FIG. 5) is a known civil engineering machine having screw blades spirally provided around an auger shaft, and an auger head H is attached to the lower end portion of the auger screw H in a replaceable manner. The auger screw S is rotated about an auger shaft by a drive unit (not shown) such as a motor connected to the upper end of the auger screw S.

杭本体１１は、例えば、底面側および上面側それぞれの端部にＰＣ鋼材（図示省略）の定着部としての金属製の端板１１ｂが設けられたプレストレストコンクリート製の杭体である。この杭本体１１は、底面及び上面が略正方形を呈する四角柱形状を有している。なお、底面と上面には、杭本体１１を長手方向に貫通する貫通穴１１ａの円形開口が形成されている。   The pile main body 11 is a pile body made of prestressed concrete in which, for example, a metal end plate 11b as a fixing portion of a PC steel material (not shown) is provided at each end on the bottom surface side and the top surface side. This pile main body 11 has a quadrangular prism shape whose bottom surface and top surface are substantially square. In addition, the circular opening of the through-hole 11a which penetrates the pile main body 11 to a longitudinal direction is formed in the bottom face and the upper surface.

切削部１２は、例えば、図３（ａ）（ｂ）に示すように、略三角錐形状を呈する鉄鋼製の部材であり、三角形状の切削面１２ａを有している。その切削面１２ａの一頂点１２ｂが下方に向けて配されており、切削面１２ａが一頂点１２ｂから貫通穴１１ａの開口へ向かって傾斜する向きとなるように、切削部１２が杭本体１１の底面に取り付けられている。   For example, as shown in FIGS. 3A and 3B, the cutting unit 12 is a steel member having a substantially triangular pyramid shape, and has a triangular cutting surface 12a. One apex 12b of the cutting surface 12a is arranged downward, and the cutting unit 12 of the pile body 11 is arranged so that the cutting surface 12a is inclined from the one apex 12b toward the opening of the through hole 11a. It is attached to the bottom.

具体的に、切削部１２は、図４（ａ）（ｂ）に示すように、切削面１２ａを有する二等辺三角形状の平板材１と、その平板材１が所定の角度で傾斜した姿勢を維持するように支える支持材２とで構成されている。支持材２は、直角三角形状を呈する二つの面が直交し、その斜辺がそれぞれ平板材１と接する形体を有している。この支持材２は、二枚の板材を直交させて溶接したものでも、一枚の板材を折り曲げて形成したものでもよい。なお、支持材２の斜辺部分と平板材１の二辺部分とが溶接されている。   Specifically, as shown in FIGS. 4A and 4B, the cutting unit 12 has an isosceles triangular flat plate 1 having a cutting surface 12a and a posture in which the flat plate 1 is inclined at a predetermined angle. It is comprised with the support material 2 supported so that it may maintain. The support member 2 has a shape in which two surfaces having a right triangle shape are orthogonal to each other and the hypotenuses thereof are in contact with the flat plate member 1. The support material 2 may be formed by welding two plate materials orthogonally or by bending a single plate material. The oblique side portion of the support member 2 and the two side portions of the flat plate member 1 are welded.

この切削部１２は、例えばボルトなどの締結部材によって杭本体１１の底面側の端板１１ｂに固定されている。また、この切削部１２は、杭本体１１の底面側の端板１１ｂに溶接によって固定することもできる。
切削部１２は、施工現場にて杭本体１１に固定しても、予め工場で杭本体１１に固定してもよい。 This cutting part 12 is being fixed to the end plate 11b by the side of the bottom face of the pile main body 11 with fastening members, such as a volt | bolt, for example. Moreover, this cutting part 12 can also be fixed to the end plate 11b of the bottom face side of the pile main body 11 by welding.
The cutting unit 12 may be fixed to the pile main body 11 at the construction site or may be fixed to the pile main body 11 in advance at the factory.

そして、杭本体１１の底面と切削面１２ａとがなす角度α（図３（ｂ）参照）は、３０°以上７５°以下であることが好ましい。この角度αは、地盤の硬さ（地質）や杭本体１１の太さなどに応じて適宜選択され、切削部１２が設計されるようになっている。本実施形態の四角柱状杭１０の場合、切削面１２ａと底面とが成す角度αは５０°に設計されている。
また、切削面１２ａの一頂点１２ｂは、四角柱状杭１０（杭本体１１）の側面の交線を当該四角柱状杭１０の長手方向に沿って延在した仮想線上に位置している。
また、切削面１２ａに隣接して互いに接している２つの面１２ｃ（図１参照）は、四角柱状杭１０（杭本体１１）の側面を当該四角柱状杭１０の長手方向に沿って延在した仮想面上に位置している。 And it is preferable that angle (alpha) (refer FIG.3 (b)) which the bottom face of the pile main body 11 and the cutting surface 12a make is 30 degrees or more and 75 degrees or less. This angle α is appropriately selected according to the hardness (geology) of the ground, the thickness of the pile body 11, and the like, and the cutting portion 12 is designed. In the case of the square columnar pile 10 of the present embodiment, the angle α formed by the cutting surface 12a and the bottom surface is designed to be 50 °.
Further, one vertex 12 b of the cutting surface 12 a is located on an imaginary line that extends along the longitudinal direction of the square columnar pile 10 at the intersection of the side surfaces of the square columnar pile 10 (pile main body 11).
Further, two surfaces 12c (see FIG. 1) adjacent to each other adjacent to the cutting surface 12a extend along the longitudinal direction of the square columnar pile 10 on the side surface of the square columnar pile 10 (pile body 11). Located on a virtual plane.

次に、本実施形態の四角柱状杭１０を地中に埋設する際の手順について説明する。   Next, the procedure at the time of embedding the square columnar pile 10 of this embodiment in the ground is demonstrated.

まず、四角柱状杭１０を地中に埋設する際の導枠材とするＨ型鋼をバックホウなどによって地中に埋め込み、さらに押さえ杭によって固定する。
次いで、四角柱状杭１０の貫通穴１１ａにオーガスクリューＳを挿入し、四角柱状杭１０およびオーガスクリューＳをクレーンで吊り込み、その四角柱状杭１０を導枠材にて案内される位置に配置する。 First, H-shaped steel, which serves as a guide frame material for embedding the quadrangular columnar pile 10 in the ground, is buried in the ground with a backhoe or the like, and further fixed with a pressing pile.
Next, the auger screw S is inserted into the through-hole 11a of the square columnar pile 10, the square columnar pile 10 and the auger screw S are suspended by a crane, and the square columnar pile 10 is arranged at a position guided by the guide frame material. .

次いで、図５（ａ）（ｂ）に示すように、オーガスクリューＳ（オーガヘッドＨ）によって四角柱状杭１０の先端側の地盤を掘削しながら四角柱状杭１０を地中に埋設する。
具体的には、オーガスクリューＳ（オーガヘッドＨ）が貫通穴１１ａと略同じ径の掘削穴を形成し、四角柱状杭１０の底面の角部に設けられた切削部１２が、その掘削穴の周囲の地盤をオーガスクリューＳ側に寄せるように削って掘削穴を略正方形状に広げ、その略正方形状に広がった掘削穴に四角柱状杭１０を沈めるように埋設している。
ここで、四角柱状杭１０の貫通穴１１ａの周囲に僅かに圧密土Ｍが生じることがあるが、その圧密土Ｍは切削部１２が切削した地盤の土砂とともにオーガスクリューＳ側に寄せられて除去されるので、四角柱状杭１０の埋設に支障はない。
なお、地盤を掘削した掘削土は、回転するオーガスクリューＳによって四角柱状杭１０の貫通穴１１ａの上部から排出される。
ここで、切削部１２は、一頂点１２ｂから貫通穴１１ａの開口へ向かって傾斜する切削面１２ａを有しているので、切削部１２が切削した掘削土は切削面１２ａに沿って移動して貫通穴１１ａの開口側にスムーズに寄せられて、オーガスクリューＳによって好適に排出されるようになっている。特に、本実施形態のように、切削面１２ａの一頂点１２ｂが、四角柱状杭１０の側面の交線を四角柱状杭１０の長手方向に沿って延在した仮想線上に位置していると、切削面１２ａの一頂点１２ｂがその仮想線上に位置していない場合と比較して、オーガヘッドＨによる掘削穴の周囲の地盤をオーガスクリューＳ側に寄せるように削る効果が高い。 Next, as shown in FIGS. 5A and 5B, the square columnar pile 10 is buried in the ground while excavating the ground on the tip side of the square columnar pile 10 with the auger screw S (auger head H).
Specifically, the auger screw S (auger head H) forms an excavation hole having substantially the same diameter as the through hole 11a, and the cutting portion 12 provided at the corner of the bottom surface of the quadrangular columnar pile 10 has an excavation hole. The surrounding ground is shaved so as to approach the auger screw S side to widen the excavation hole into a substantially square shape, and the quadrangular columnar pile 10 is embedded in the excavation hole that expands into the substantially square shape.
Here, there is a case where the compacted soil M is slightly generated around the through hole 11a of the square columnar pile 10. The compacted soil M is moved to the auger screw S side together with the earth and sand cut by the cutting portion 12 and removed. Therefore, there is no hindrance to the embedding of the square columnar pile 10.
The excavated soil excavated from the ground is discharged from the upper part of the through hole 11a of the square columnar pile 10 by the rotating auger screw S.
Here, since the cutting part 12 has the cutting surface 12a which inclines toward the opening of the through hole 11a from one vertex 12b, the excavated soil cut by the cutting part 12 moves along the cutting surface 12a. It is smoothly brought close to the opening side of the through hole 11a and is suitably discharged by the auger screw S. In particular, as in the present embodiment, when one vertex 12b of the cutting surface 12a is located on an imaginary line extending along the longitudinal direction of the quadrangular columnar pile 10 at the intersection of the side surfaces of the quadrangular columnar pile 10, Compared with the case where one vertex 12b of the cutting surface 12a is not located on the imaginary line, the effect of cutting the ground around the excavation hole by the auger head H to the auger screw S side is high.

所定の深度に四角柱状杭１０を埋設した後、貫通穴１１ａからオーガスクリューＳを抜き出して、次に埋設する四角柱状杭１０の貫通穴１１ａに挿入し、四角柱状杭１０の埋設を繰り返す。
そして、所定数の四角柱状杭１０を隣接させて並設することで、壁構造体を構築することができる。 After embedding the square columnar pile 10 at a predetermined depth, the auger screw S is extracted from the through hole 11a, inserted into the through hole 11a of the rectangular column pile 10 to be embedded next, and the embedding of the square columnar pile 10 is repeated.
And a wall structure can be constructed | assembled by arranging in parallel the predetermined number of square pillar-shaped piles 10 adjacent.

以上のように、底面の角部に切削部１２が設けられている四角柱状杭１０であれば、貫通穴１１ａに挿入したオーガスクリューＳが先行掘削した掘削穴を、切削部１２によって四角柱状杭１０の底面のサイズに広げるように切削することができるので、四角柱状杭１０を容易に地中に埋設することが可能になる。   As described above, in the case of the quadrangular columnar pile 10 in which the cutting portion 12 is provided at the corner portion of the bottom surface, the excavation hole previously drilled by the auger screw S inserted into the through hole 11a is formed by the cutting portion 12 into the quadrangular columnar pile. Since it can cut so that it may expand to the size of the bottom face of 10, square pillar pile 10 can be easily embed | buried in the ground.

特に、図６（ａ）（ｂ）に示すように、回転抵抗や油圧の供給などによって拡縮可能なオーガヘッドＨを用いれば、貫通穴１１ａの径よりも大きな掘削穴を形成することができ、切削部１２によって地盤を削り取る部分が少なくなるので、より容易に四角柱状杭１０を地中に埋設することができる。   In particular, as shown in FIGS. 6 (a) and 6 (b), if an auger head H that can be expanded and contracted by rotation resistance, hydraulic pressure supply, or the like is used, a drilling hole larger than the diameter of the through hole 11a can be formed. Since the portion where the ground is scraped off by the cutting portion 12 is reduced, the square columnar pile 10 can be embedded in the ground more easily.

このように、本実施形態の四角柱状杭１０であれば、切削部１２によって地盤を削り取ってオーガスクリューＳによる掘削穴を広げることができるので、四角柱状杭１０を地中に埋設する過程で杭の底面に圧密土が生じてしまうことはなく、容易に四角柱状杭１０を地中に埋設することができる。
つまり、この四角柱状杭１０は、地中に埋設しやすい優れた杭体として様々な用途に活用することができる。 Thus, if it is the square pillar-shaped pile 10 of this embodiment, since the ground can be scraped off by the cutting part 12 and the excavation hole by the auger screw S can be expanded, the pile in the process of burying the square pillar-shaped pile 10 in the ground Consolidation soil does not occur on the bottom surface of the square pillars, and the square columnar pile 10 can be easily embedded in the ground.
That is, this square columnar pile 10 can be utilized for various applications as an excellent pile body that is easily embedded in the ground.

なお、本発明は上記実施形態に限られるものではない。
例えば、図７（ａ）（ｂ）に示すように、切削部１２は、切削面１２ａを有する二等辺三角形状の平板材１と、その平板材１が所定の角度で傾斜した姿勢を維持するように支える支持板３とで構成されていてもよい。この支持板３は直角三角形状を呈する板材であって、その斜辺が平板材１を２つの直角三角形に二分する中心線と直交するように溶接などによって固定されている。
このような切削部１２であっても、オーガスクリューＳによる掘削穴を四角柱状杭１０の底面のサイズに広げるように切削することができる。 The present invention is not limited to the above embodiment.
For example, as shown in FIGS. 7A and 7B, the cutting unit 12 maintains an isosceles triangular flat plate material 1 having a cutting surface 12a and a posture in which the flat plate material 1 is inclined at a predetermined angle. It may be comprised with the support plate 3 supported so. The support plate 3 is a plate material having a right triangle shape, and is fixed by welding or the like so that the hypotenuse of the support plate 3 is orthogonal to a center line that bisects the flat plate material 1 into two right triangles.
Even such a cutting portion 12 can be cut so as to widen the excavation hole by the auger screw S to the size of the bottom surface of the square columnar pile 10.

また、図８（ａ）（ｂ）に示すように、切削部１２は、切削面１２ａを有する二等辺三角形状の平板材１と、その平板材１を支える支持柱４とで構成されていてもよい。この支持柱４は円柱状の部材であって、その一端が所定の角度を有する傾斜面とされている。この支持柱４の傾斜面に溶接などによって固定された平板材１は、所定の角度で傾斜した姿勢となる。
このような切削部１２であっても、オーガスクリューＳによる掘削穴を四角柱状杭１０の底面のサイズに広げるように切削することができる。 Further, as shown in FIGS. 8A and 8B, the cutting portion 12 includes an isosceles triangular flat plate material 1 having a cutting surface 12 a and a support column 4 that supports the flat plate material 1. Also good. The support column 4 is a cylindrical member, and one end of the support column 4 is an inclined surface having a predetermined angle. The flat plate 1 fixed to the inclined surface of the support column 4 by welding or the like is inclined at a predetermined angle.
Even such a cutting portion 12 can be cut so as to widen the excavation hole by the auger screw S to the size of the bottom surface of the square columnar pile 10.

なお、以上の実施の形態においては、クレーンを使用して四角柱状杭１０を地中に埋設するようにしたが、本発明はこれに限定されるものではなく、例えば、杭圧入機や杭打機を使用して四角柱状杭１０を地中に埋設するようにしてもよい。   In addition, in the above embodiment, although the quadrangular columnar pile 10 was embed | buried in the ground using a crane, this invention is not limited to this, For example, a pile press-in machine and a pile driving machine The square columnar pile 10 may be embedded in the ground using a machine.

また、以上の実施の形態においては、切削部１２が杭本体１１の底面に取り付けられるものであるようにしたが、本発明はこれに限定されるものではなく、例えば、杭本体１１の底面側の端板１１ｂと切削部１２とが一体成型されていてもよい。これによれば、切削部１２を杭本体１１の底面に取り付ける手間が省ける。   Moreover, in the above embodiment, although the cutting part 12 was attached to the bottom face of the pile main body 11, this invention is not limited to this, For example, the bottom face side of the pile main body 11 The end plate 11b and the cutting part 12 may be integrally formed. According to this, the effort which attaches the cutting part 12 to the bottom face of the pile main body 11 can be saved.

また、以上の実施形態においては、本発明の四角柱状杭がプレストレストコンクリート製の杭体である例を挙げて説明したが、本発明の四角柱状杭はこれに限定されるものではなく、例えば、ＳＣ杭（Ｓｔｅｅｌ Ｃｏｍｐｏｓｉｔｅ Ｃｏｎｃｒｅｔｅ Ｐｉｌｅｓ）やＲＣ杭（Ｒｅｉｎｆｏｒｃｅｄ Ｃｏｎｃｒｅｔｅ ｐｉｌｅ）やＰＨＣ杭（Ｐｒｅｔｅｎｓｉｏｎｅｄ Ｓｐｕｎ Ｈｉｇｈ Ｓｔｒｅｎｇｔｈ Ｃｏｎｃｒｅｔｅ Ｐｉｌｅｓ）などであってもよい。なお、杭底面がコンクリートの場合には、本発明にいう切削部を、例えば、その杭底面にボルトなどの締結部材によって固定してもよく、あるいは、その杭底面に金属板を取り付けたうえでその金属板に溶接によって固定してもよい。   Moreover, in the above embodiment, the square columnar pile of the present invention has been described with an example of a pile body made of prestressed concrete, but the square columnar pile of the present invention is not limited to this, for example, It may be an SC pile (Steel Composite Concrete Piles), an RC pile (Reinforced Concrete pile), a PHC pile (Pretended Spun High Strength Pipes), or the like. When the bottom of the pile is concrete, the cutting portion referred to in the present invention may be fixed to the bottom of the pile with a fastening member such as a bolt, or a metal plate is attached to the bottom of the pile. You may fix to the metal plate by welding.

また、その他、具体的な細部構造等についても適宜に変更可能であることは勿論である。   In addition, it is needless to say that other specific detailed structures can be appropriately changed.

１ 平板材
２ 支持材
３ 支持板
４ 支持柱
１０ 四角柱状杭
１１ 杭本体
１１ａ 貫通穴
１１ｂ 端板
１２ 切削部
１２ａ 切削面
１２ｂ 一頂点
Ｓ オーガスクリュー
Ｈ オーガヘッド DESCRIPTION OF SYMBOLS 1 Flat plate material 2 Support material 3 Support plate 4 Support column 10 Square columnar pile 11 Pile main body 11a Through-hole 11b End plate 12 Cutting part 12a Cutting surface 12b One vertex S Auger screw H Auger head

Claims (2)

オーガスクリューを挿通可能な貫通穴を有する四角柱状杭であって、
当該四角柱状杭の底面の角部には、三角形状の切削面を有する切削部が設けられ、前記切削面の一頂点が下方に向けて配されており、前記切削面は前記一頂点から前記貫通穴へ向かって傾斜していることを特徴とする四角柱状杭。 A square columnar pile with a through hole through which an auger screw can be inserted,
A cutting portion having a triangular cutting surface is provided at a corner portion of the bottom surface of the square columnar pile, and one vertex of the cutting surface is arranged downward, and the cutting surface is from the one vertex to the above A square columnar pile characterized by inclining toward a through hole. 前記切削面の一頂点は、当該四角柱状杭の側面の交線を当該四角柱状杭の長手方向に沿って延在した仮想線上に位置していることを特徴とする請求項１に記載の四角柱状杭。   2. The square according to claim 1, wherein one vertex of the cutting surface is located on an imaginary line extending along the longitudinal direction of the square columnar pile with the intersection line of the side surfaces of the square columnar pile. Column pile.
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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS46408Y1 (en) * 1965-10-27 1971-01-08
JPS5024525B1 (en) * 1969-07-15 1975-08-16
JPS54178904U (en) * 1978-05-19 1979-12-18
JPS55150841U (en) * 1979-04-17 1980-10-30
JPH05321253A (en) * 1992-05-22 1993-12-07 Hitachi Constr Mach Co Ltd Boring device
EP1482094A1 (en) * 2003-05-26 2004-12-01 Heifu B.V. Apparatus for arranging a pile in the ground for foundation or sheet piling purposes
JP2005155303A (en) * 2003-11-07 2005-06-16 Giken Seisakusho Co Ltd Method for forming pile wall and elastic sealing material
CN101974905A (en) * 2010-10-22 2011-02-16 上海中技桩业股份有限公司 Pile-embedding method for hollow pile and auger drill for implementing same

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS46408Y1 (en) * 1965-10-27 1971-01-08
JPS5024525B1 (en) * 1969-07-15 1975-08-16
JPS54178904U (en) * 1978-05-19 1979-12-18
JPS55150841U (en) * 1979-04-17 1980-10-30
JPH05321253A (en) * 1992-05-22 1993-12-07 Hitachi Constr Mach Co Ltd Boring device
EP1482094A1 (en) * 2003-05-26 2004-12-01 Heifu B.V. Apparatus for arranging a pile in the ground for foundation or sheet piling purposes
JP2005155303A (en) * 2003-11-07 2005-06-16 Giken Seisakusho Co Ltd Method for forming pile wall and elastic sealing material
CN101974905A (en) * 2010-10-22 2011-02-16 上海中技桩业股份有限公司 Pile-embedding method for hollow pile and auger drill for implementing same

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