JP2007224537A - Foundation for steel pipe pole, and foundation method therefor - Google Patents

Foundation for steel pipe pole, and foundation method therefor Download PDF

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JP2007224537A
JP2007224537A JP2006044909A JP2006044909A JP2007224537A JP 2007224537 A JP2007224537 A JP 2007224537A JP 2006044909 A JP2006044909 A JP 2006044909A JP 2006044909 A JP2006044909 A JP 2006044909A JP 2007224537 A JP2007224537 A JP 2007224537A
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foundation
pipe
blade
steel pipe
pipe pole
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JP3839461B1 (en
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Akira Kawahara
晃 川原
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Yoshimoto Pole Co Ltd
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Yoshimoto Pole Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a foundation for a steel pipe pole with an excavating blade provided at the end of a foundation pipe for fixing a columnar pipe which forms a simple foundation and is excellent in construction performance and durability against a repeated load caused by a strong wind, an earthquake, etc., and a foundation method for the foundation. <P>SOLUTION: The foundation for the steel pipe pole with the excavating blade provided at the end of the foundation pipe, and the foundation method therefor are characterized in that the excavating blade the edge of which is provided in the longitudinal direction of the foundation pipe is formed by notching the end of the foundation pipe in a tooth shape. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、柱管を固定する基礎管の端部に掘削刃を有する鋼管ポール用基礎およびその基礎工法に関する。
具体的には、例えば、道路標識や外灯などに用いる円形鋼管や角形鋼管を使用した鋼管ポール用基礎およびその基礎工法に関する。 The present invention relates to a steel pipe pole foundation having a drilling blade at an end of a foundation pipe for fixing a column pipe, and a foundation method for the foundation.
Specifically, for example, the present invention relates to a steel pipe pole foundation using a circular steel pipe or a square steel pipe used for road signs, outdoor lights, and the like, and its foundation method.

道路標識や外灯などに用いる円形鋼管や角形鋼管を使用した鋼管ポール用基礎は、強風などよる繰り返し荷重に長期間耐える耐久性と施工性が求められており、鋼管をコンクリートに直接埋め込む方法や、土中に打ち込んだＨ形鋼からなる杭基礎に鋼管ポールのアンカーを溶接する方法など種々の方法が用いられているが、従来のコンクリート基礎はコンクリートの養生期間が必要であり工程が多いため施工に時間がかかるうえ、打ち込み基礎は、大型の打ち込み機が必要となるうえ、騒音問題が生じるという問題点があった。   Steel pipe pole foundations using round and square steel pipes used for road signs and outdoor lights are required to have durability and workability that can withstand repeated loads caused by strong winds for a long period of time. Various methods are used, such as welding the anchors of steel pipe poles to pile foundations made of H-shaped steel driven into the soil. However, conventional concrete foundations require a concrete curing period and are constructed with many processes. In addition, the driving foundation requires a large driving machine and causes noise problems.

そこで、鋼管ポール自体を基礎として用いる方法が検討され、従来から種々の提案がなされている。
例えば、先端にスクリュービットを有する掘削機（オーガ）を用いて鋼管ポールの内側の土砂を取り除くことにとって、鋼管ポールを土中に貫入し易くして土中に埋め込む方法が提案され、一部で採用されている。
しかし、この方法は、鋼管ポールの内側の土砂を一旦取り除き、基礎が出来上がった後に再度埋め戻す
など、残土処理が必要となるという問題点があった。
また、特開２００３−０２７４７５号公報（特許文献１）には、図３に示すように基礎管１の端部における外周に傾斜した掘削刃４´を設けることにより、基礎管１を回転しながら土中に押し込む方法が提案されている。 Therefore, methods using the steel pipe pole itself as a basis have been studied, and various proposals have been made.
For example, in order to remove the earth and sand inside the steel pipe pole using an excavator (auger) having a screw bit at the tip, a method of embedding the steel pipe pole in the soil so as to make it easy to penetrate into the soil has been proposed. It has been adopted.
However, this method has a problem that the soil inside the steel pipe pole is once removed, and after the foundation is completed, it is refilled again.
Further, in Japanese Patent Application Laid-Open No. 2003-027475 (Patent Document 1), as shown in FIG. 3, an inclined excavating blade 4 ′ is provided on the outer periphery at the end of the basic pipe 1, thereby rotating the basic pipe 1. A method of pushing into the soil has been proposed.

しかし、この方法は、図３に示すように傾斜した掘削刃４´を新たに作り、基礎管１の外周に溶接する必要があるうえ、基礎管１の回転と推進を同調させるために大掛かりな回転圧入機を用いる必要があり、施工コストが高くつくという問題点があった。
また、傾斜した掘削刃４´が回転して土中を進む際に、基礎管１の周囲の土壁を崩してしまうため、出来上がった基礎の耐力が低下してしまうという問題点もあった。
特開２００３−０２７４７５号公報 However, this method requires a new excavating blade 4 'inclined as shown in FIG. 3 and welded to the outer periphery of the foundation pipe 1, and also requires a large scale to synchronize the rotation and propulsion of the foundation pipe 1. It was necessary to use a rotary press-fitting machine, and there was a problem that the construction cost was high.
Further, when the inclined excavating blade 4 'rotates and advances through the soil, the earth wall around the foundation pipe 1 is destroyed, so that the yield strength of the completed foundation is reduced.
Japanese Patent Laid-Open No. 2003-027475

本発明は、前述のような従来技術の問題点を解決し、柱管を固定する基礎管の端部に掘削刃を有する鋼管ポール用基礎において簡便な基礎を形成し、強風や地震などによる繰り返し荷重に対する耐久性、施工性に優れた鋼管ポール用基礎およびその基礎工法を提供することを課題とする。   The present invention solves the problems of the prior art as described above, forms a simple foundation in a steel pipe pole foundation having an excavating blade at the end of the foundation pipe for fixing the column pipe, and is repeatedly caused by strong winds, earthquakes, etc. It is an object to provide a steel pipe pole foundation excellent in durability against load and workability and its foundation method.

本発明は、前述の課題を解決するために鋭意検討の結果、柱管を固定する基礎管の端部を歯型状に切欠いて、その基礎管の長手方向に刃先を有する掘削刃を形成することによって簡便な基礎を形成することができ、強風や地震などによる繰り返し荷重に対する耐久性、施工性に加に優れた鋼管ポール用基礎およびその基礎工法を提供するものであり、その要旨とするところは特許請求の範囲に記載した通りの下記内容である。
（１）柱管を固定する基礎管の端部に掘削刃を有する鋼管ポール用基礎において、前記掘削刃は、基礎管の端部を歯形状に切り欠いて、該基礎管の長手方向に刃先を有する掘削刃を形成したことを特徴とする鋼管ポール用基礎。
（２）前記掘削刃の刃先角θを30〜70度、刃高Ｈを30〜100mm、刃幅Ｗを50〜100mmとしたことを特徴とする（１）に記載の鋼管ポール用基礎。
（３）前記掘削刃の刃元を前記基礎管の内側方向に湾曲させたことを特徴とする（１）または（２）に記載の鋼管ポール用基礎。
（４）前記湾曲させた刃元幅Ｗ´を刃幅Ｗの30〜50％、前記刃元の基礎管径方向の湾曲距離Ｄを5〜20mmとしたことを特徴とする（１）乃至（３）のいずれかに記載の鋼管ポール用基礎。
（５）（１）乃至（４）のいずれかに記載の鋼管ポール用基礎を、長手軸を中心に回転させながら地面に押し込むことにより、基礎外面の土壁をくずさず、かつ、基礎内面の残土処理を必要としないことを特徴とする鋼管ポールの基礎工法。 As a result of intensive studies to solve the above-mentioned problems, the present invention forms a drilling blade having a cutting edge in the longitudinal direction of the foundation pipe by cutting out the end of the foundation pipe fixing the column pipe into a tooth shape. It is possible to form a simple foundation, and to provide a steel pipe pole foundation excellent in durability and workability against repeated loads due to strong winds, earthquakes, etc. and its foundation method. Is the following content as described in the claims.
(1) In a steel pipe pole foundation having an excavating blade at an end of a foundation pipe for fixing a column pipe, the excavating blade is cut out at the end of the foundation pipe into a tooth shape, and a cutting edge is formed in the longitudinal direction of the foundation pipe. A steel pipe pole foundation characterized in that a drilling blade having a shape is formed.
(2) The steel pipe pole foundation according to (1), wherein the cutting edge angle θ of the excavating blade is 30 to 70 degrees, the blade height H is 30 to 100 mm, and the blade width W is 50 to 100 mm.
(3) The steel pipe pole foundation according to (1) or (2), wherein a cutting edge of the excavating blade is curved inward of the foundation pipe.
(4) The curved cutting edge width W ′ is 30 to 50% of the cutting edge width W, and the bending distance D of the cutting edge in the basic tube diameter direction is 5 to 20 mm. The foundation for steel pipe poles as described in any one of 3).
(5) By pushing the steel pipe pole foundation according to any one of (1) to (4) into the ground while rotating about the longitudinal axis, the earth wall of the foundation outer surface is not destroyed and A steel pipe pole foundation method that does not require residual soil treatment.

本発明によれば、柱管を固定する基礎管の端部を歯型状に切欠いて、その基礎管の長手方向に刃先を有する掘削刃を形成することによって簡便な基礎を形成することができ、強風や地震などによる繰り返し荷重に対する耐久性、施工性に加に優れた鋼管ポール用基礎およびその基礎工法を提供することができ、産業上有用な著しい効果を奏する。   According to the present invention, a simple foundation can be formed by notching the end portion of the foundation pipe for fixing the column pipe into a tooth shape and forming a drilling blade having a cutting edge in the longitudinal direction of the foundation pipe. In addition, it is possible to provide a steel pipe pole foundation excellent in durability and resistance to repeated loads due to strong winds, earthquakes, and the like, and its foundation method of construction, and has a remarkable industrially useful effect.

発明を実施するための最良の形態について、図１乃至図３を用いて詳細に説明する。
図３は、従来の掘削刃を有する鋼管ポール用基礎を例示する側断面図である。
図３において、１は基礎管、２はフランジ、３はボルト穴、４´は掘削刃を示し、基礎管１の上部にフランジ２を介して柱管がボルト穴３の位置で固定される。 The best mode for carrying out the invention will be described in detail with reference to FIGS.
FIG. 3 is a side sectional view illustrating a steel pipe pole foundation having a conventional excavating blade.
In FIG. 3, reference numeral 1 denotes a foundation pipe, 2 denotes a flange, 3 denotes a bolt hole, 4 ′ denotes a drilling blade, and a column pipe is fixed to the upper portion of the foundation pipe 1 via the flange 2 at the position of the bolt hole 3.

前述のように、従来の掘削刃４´は、図３に示すように基礎管１の端部における外周に傾斜させて取り付けられており、基礎管１を回転しながら土中に押し込むことによって、掘削刃４´が地中方向への推進力を担うことができ、基礎管１の内面の土砂を取り除く必要がないので残土処理が不要であるうえ、打ち込む必要がないため騒音問題も軽減することができる。   As described above, the conventional excavation blade 4 'is attached to the outer periphery at the end of the foundation pipe 1 as shown in FIG. 3, and by pushing the foundation pipe 1 into the soil while rotating, The excavating blade 4 'can bear the propulsive force in the underground direction, so there is no need to remove the earth and sand on the inner surface of the foundation pipe 1, so no residual soil treatment is necessary, and noise problems are reduced because there is no need to drive in Can do.

しかし、この方法は、図３に示すように地中方向に傾斜した掘削刃４´を新たに作り、基礎管１の外周に溶接する必要があるうえ、掘削刃４´の傾斜角によって、基礎管１の回転角と推進距離との関係が決まってしまうので、基礎管１の回転角と推進距離とを同調させるために大掛かりな回転圧入機を用いる必要があり、施工コストが高くつくという問題点があり、基礎管１の径が250mmφを超える建築用の基礎工法としてはよいが、基礎管１の径が150〜250mmφ程度の、道路標識や外灯などに用いる鋼管ポール用基礎には適さなかった。
また、傾斜した掘削刃４´が回転して土中を進む際に、基礎管１の周囲の土壁を崩してしまうため、出来上がった基礎の耐力が低下してしまうという問題点もあった。 However, in this method, as shown in FIG. 3, it is necessary to make a new excavating blade 4 'inclined in the underground direction and weld it to the outer periphery of the foundation pipe 1, and also depending on the inclination angle of the excavating blade 4'. Since the relationship between the rotation angle of the tube 1 and the propulsion distance is determined, it is necessary to use a large rotary press-fitting machine in order to synchronize the rotation angle of the basic tube 1 and the propulsion distance, which increases the construction cost. There is a point, but it is good as a foundation method for construction where the diameter of the foundation pipe 1 exceeds 250mmφ, but it is not suitable for the foundation for steel pipe poles with the diameter of the foundation pipe 1 of about 150 ~ 250mmφ used for road signs and outdoor lights etc. It was.
Further, when the inclined excavating blade 4 'rotates and advances through the soil, the earth wall around the foundation pipe 1 is destroyed, so that the yield strength of the completed foundation is reduced.

図１は、本発明における鋼管ポール用基礎の実施形態を例示する側縦断面図である。
また、図２は、本発明における鋼管ポール用基礎に用いる掘削刃を例示する詳細図であり、上段（a）は、基礎管の長手方向から見た横断面図、下段(b)は、側断面図である。
図１及び図２において、１は基礎管、２はフランジ、３はボルト穴、４は掘削刃、５は刃先、６は刃元、θは刃先角（度）、Ｈ刃高(mm)、Ｗは刃幅(mm)、Ｗ´湾曲させた刃元幅(mm)、Ｄは刃元の基礎管径方向の湾曲距離を(mm)を示し、基礎管１の上部にフランジ２を介して柱管がボルト穴３の位置で固定される。 FIG. 1 is a side longitudinal sectional view illustrating an embodiment of a steel pipe pole foundation according to the present invention.
FIG. 2 is a detailed view illustrating a drilling blade used for a steel pipe pole foundation according to the present invention, wherein the upper stage (a) is a cross-sectional view seen from the longitudinal direction of the foundation pipe, and the lower stage (b) is a side view. It is sectional drawing.
1 and 2, 1 is a basic pipe, 2 is a flange, 3 is a bolt hole, 4 is a drilling blade, 5 is a cutting edge, 6 is a cutting edge, θ is a cutting edge angle (degrees), H blade height (mm), W is the blade width (mm), W ′ is the curved blade base width (mm), D is the bending distance in the basic pipe radial direction of the blade base (mm), and the upper part of the basic pipe 1 via the flange 2 The column tube is fixed at the position of the bolt hole 3.

図１及び図２に示すように、本発明の鋼管ポール用基礎は、基礎管１の端部に掘削刃４を有する鋼管ポール用基礎において、前記掘削刃４は、基礎管１の端部を歯形状に切り欠いて、該基礎管１の長手方向に刃先５を有する掘削刃を形成したことを特徴とする。
本発明は、基礎管１の端部を歯形状に切り欠いて、該基礎管１の長手方向に刃先５を有する掘削刃４を形成させることによって、図３に示す従来の掘削刃４´のように、基礎管１の外周に掘削刃を溶接する必要がなく、簡便に掘削刃４を形成することができる。 As shown in FIGS. 1 and 2, the steel pipe pole foundation of the present invention is a steel pipe pole foundation having an excavating blade 4 at the end of the foundation pipe 1, and the excavating blade 4 has an end of the foundation pipe 1. An excavation blade having a cutting edge 5 in the longitudinal direction of the basic pipe 1 is formed by cutting out into a tooth shape.
In the present invention, the end portion of the foundation pipe 1 is cut out in a tooth shape, and the excavation blade 4 having the cutting edge 5 in the longitudinal direction of the foundation pipe 1 is formed, whereby the conventional excavation blade 4 ′ shown in FIG. Thus, it is not necessary to weld a digging blade to the outer periphery of the foundation pipe 1, and the digging blade 4 can be formed easily.

本発明においては、掘削刃４の形成方法は問わないが、切断精度及び汎用性の観点から、例えば、プラズマやレーザーなどを用いた切断機を用いて、基礎管１の管端を歯形状に切除する方法が好ましい。
また、本発明に用いる切削刃４は、基礎管１の長手方向に刃先５を有するので、基礎管１の外周方向に刃先を有する場合に比べて、掘削抵抗を著しく低減することができるうえ、基礎管１の回転と土中方向への推進距離を自由に選択できるため、従来の基礎管１の外周に設けた掘削刃４´のように、掘削刃の傾斜角に応じて基礎管１の回転角と推進距離とを同調させる大掛かりな回転圧入機を用いる必要がなく、コンクリート電柱の建柱に一般的に用いられている自走式建柱機を使用することで充分である。 In the present invention, the method of forming the excavating blade 4 is not limited, but from the viewpoint of cutting accuracy and versatility, for example, using a cutting machine using plasma or laser, the tube end of the basic tube 1 is formed into a tooth shape. A method of excision is preferred.
Moreover, since the cutting blade 4 used for this invention has the blade edge | tip 5 in the longitudinal direction of the foundation pipe 1, excavation resistance can be reduced remarkably compared with the case where it has a blade edge in the outer peripheral direction of the foundation pipe 1, Since the rotation of the foundation pipe 1 and the propulsion distance in the soil direction can be freely selected, the foundation pipe 1 can be selected according to the inclination angle of the excavation blade, such as the excavation blade 4 'provided on the outer periphery of the conventional foundation pipe 1. It is not necessary to use a large rotary press-fitting machine that synchronizes the rotation angle and the propulsion distance, and it is sufficient to use a self-propelled building column machine that is generally used for a concrete utility pole.

また、本発明においては、図１の矢印で示すように基礎管１を回転させながら地中に押し込むことによって、掘削刃４が地面を切削しながら地中に押し込まれるため、基礎管１の内側に土砂が内在する状態で基礎管１を土中に埋め込むことができ、基礎管１の内側の土砂を取り除いたり、埋め戻したりする必要がない。
さらに、本発明においては、掘削刃４が基礎管１の外周から外側に突出していないので、基礎管１の外周の土壁を崩すことがないため、出来上がった基礎の耐力が低下してしまうという問題点も解消された。 In the present invention, as shown by the arrow in FIG. 1, the excavation blade 4 is pushed into the ground while cutting the ground by rotating the foundation pipe 1 into the ground. The foundation pipe 1 can be embedded in the soil in a state where the earth and sand are present, and it is not necessary to remove or backfill the earth and sand inside the foundation pipe 1.
Furthermore, in the present invention, since the excavation blade 4 does not protrude outward from the outer periphery of the foundation pipe 1, the earth wall of the outer circumference of the foundation pipe 1 is not destroyed, so that the yield strength of the completed foundation is reduced. The problem was solved.

次に、本発明の好ましい実施形態について説明する。
本発明に用いる掘削刃４の刃元６は、図２（a）の横断面図に示すように、基礎管１の内側方向に湾曲させることが好ましい。
基礎管１を埋め込む地中の土砂が空隙を多く含む場合には、基礎管１を回転させながら比較的簡単に地中に押し込むことができるが、水分を含んだ粘土層に押し込む場合には、空隙が少ないため、粘土層が掘削刃４にからまって推進できなくなる場合がある。 Next, a preferred embodiment of the present invention will be described.
The cutting edge 6 of the excavating blade 4 used in the present invention is preferably curved in the inner direction of the foundation pipe 1 as shown in the cross-sectional view of FIG.
If the earth and sand in which the foundation pipe 1 is embedded contains a lot of voids, it can be pushed into the ground relatively easily while rotating the foundation pipe 1, but when it is pushed into a clay layer containing moisture, Since there are few voids, the clay layer may become entangled with the excavating blade 4 and cannot be propelled.

そこで、図２（a）の基礎管１の長手方向から見た横断面図に示すように、掘削刃４の刃元６を、基礎管１の内側方向に湾曲させることによって、粘土層を「ろくろ」でなでるように、基礎管１の内側に図２（a）の矢印の方向に押し込むことによって、基礎管１の内面と粘土層との間に空隙を形成することができるため、粘土質の地盤であっても基礎管１を比較的容易に押し込むことができる。
また、本発明においては、基礎管１の径は問わないが、道路標識や外灯などに多用されている比較的小径の150〜250mmφの円形鋼管や150〜250mm□の角形鋼管を使用した鋼管ポールに用いることが好ましい。 Therefore, as shown in the cross-sectional view seen from the longitudinal direction of the basic pipe 1 in FIG. 2A, the clay layer is formed by curving the cutting edge 6 of the excavating blade 4 in the inner direction of the basic pipe 1. Since it is possible to form a void between the inner surface of the foundation pipe 1 and the clay layer by pushing it into the inside of the foundation pipe 1 in the direction of the arrow in FIG. The foundation pipe 1 can be pushed in relatively easily even if it is the ground.
In the present invention, the diameter of the basic pipe 1 is not limited, but a steel pipe pole using a relatively small-diameter 150-250 mmφ round steel pipe or 150-250 mm □ square steel pipe, which is frequently used for road signs and outdoor lights. It is preferable to use for.

本発明者は、この管径150〜250mmφサイズの基礎管１を対象として、種々の実験を行った結果、図２（b）に示す掘削刃４の刃先角θを30〜70度、刃高Ｈを30〜100mm、刃幅Ｗを50〜100mmとし、前記湾曲させた刃元幅Ｗ´を刃幅Ｗの30〜50％、前記刃元の基礎管径方向の湾曲距離Ｄを5〜20mmとすることが好ましいことを見出した。
まず、刃先角θを30〜70度とするのは、刃先角θが30度未満では、刃の強度が弱く、掘削した際に刃先が曲がってしまうからであり、また、刃先角θが70度を超えると掘削力が弱くなって基礎管１を土中に推進できなくなるからである。 As a result of various experiments conducted on the basic pipe 1 having a pipe diameter of 150 to 250 mmφ, the present inventor has found that the cutting edge angle θ of the excavating blade 4 shown in FIG. H is 30 to 100 mm, the blade width W is 50 to 100 mm, the curved blade width W ′ is 30 to 50% of the blade width W, and the bending distance D of the blade base in the basic tube diameter direction is 5 to 20 mm. It was found that it is preferable.
First, the cutting edge angle θ is set to 30 to 70 degrees because the cutting edge angle θ is less than 30 degrees because the strength of the blade is weak and the cutting edge is bent when excavated. This is because the excavation force becomes weaker than the degree, and the foundation pipe 1 cannot be pushed into the soil.

また、刃高Ｈを30〜100mm、刃幅Ｗを50〜100mmとするのは、掘削刃の刃高を小さく刃幅を広くした方が刃の強度が向上する一方で掘削力が低下するため、刃の強度と掘削力のバランスを考慮し、種々の実験の結果、この範囲であれば掘削できることが判明したからである。
また、湾曲させた刃元幅Ｗ´を刃幅Ｗの30〜50％、前記刃元の基礎管径方向の湾曲距離Ｄを5〜20mmとするのは、湾曲幅Ｗ´及び湾曲距離Ｄを大きくすることによって、前述の粘土層を管の内側に押し込む効果は増大するが、その分、掘削刃４の強度が低下するため、粘土層を管の内側に押し込む効果と掘削刃の強度とのバランスを考慮し、種々の実験の結果、この範囲であれば粘土質の地盤であっても掘削できることが判明したからである。 The blade height H is set to 30-100 mm and the blade width W is set to 50-100 mm because the blade strength is improved while the cutting force is reduced while the blade height is reduced and the blade width is increased. This is because, considering the balance between the strength of the blade and the excavation force, it was found that excavation was possible within this range as a result of various experiments.
Further, the curved blade width W ′ is 30 to 50% of the blade width W, and the bending distance D in the basic tube diameter direction of the blade edge is 5 to 20 mm. By increasing the size, the effect of pushing the clay layer into the pipe increases. However, the strength of the excavating blade 4 decreases accordingly, so the effect of pushing the clay layer into the pipe and the strength of the excavating blade This is because, as a result of various experiments in consideration of balance, it was found that even within this range, excavation is possible even in clay soil.

なお、本発明においては、掘削刃４の枚数は問わないが、１０枚以上では、掘削の際に刃が折れ曲がったため、掘削刃４の枚数は５〜７枚が好ましい。
また、本発明においては、刃元幅Ｗ´を湾曲させる方法は問わないが、刃元の刃幅Ｗの30〜50％に切り込みを入れ、その先端部分を基礎管１の内側に押し込んで円弧状に湾曲させることが好ましい。
また、図１に示すように、刃元６の湾曲部の先端を基礎管の内径方向に折り曲げてすくい角を付けることにより、前述の粘土を内側に押し込む効果をさらに増大させることができる。
また、基礎管１の長さは通常２〜３ｍであるが、柱管の径や長さの関係で３〜５ｍの長さの基礎管１が必要な場合には、特に土質が粘土層の場合には、刃先形状の工夫だけでは基礎管１の内部に、土砂が詰り基礎管１の内面との摩擦力が増加するため、一度の工程で基礎管１を埋め込むことが困難な場合がある。
そこで、例えば、基礎管１の長さが４ｍの場合を例に挙げると、掘削開始から約１ｍ掘削した時点で基礎管１を一旦引き抜き、先端にスクリュービットを有する掘削機（オーガ）などを用いて、基礎管１の内側に詰まっている土砂を取り除いた後に再度掘削を開始し、状況によってこの作業を繰り返し、最終の１ｍについては基礎管１を引き抜くことなく埋設作業を終了させることができる。
この場合、基礎管１の内側から除去した土砂が排出されるが、掘削終了後に基礎管１の内部に残土を投入することで、土砂の残存を極力低減することができる。
以上のように、柱管を固定する基礎管１の端部を歯形状に切り欠いて、該基礎管１の長手方向に刃先を有する掘削刃４を形成した鋼管ポール用基礎を長手軸を中心に回転させながら地面に押し込むことにより、基礎外面の土壁をくずさず、かつ、基礎内面の残土処理を必要としない鋼管ポールの基礎工法を実現することができる。 In the present invention, the number of the excavating blades 4 is not limited, but when the number is 10 or more, the blades are bent during excavation, and therefore the number of excavating blades 4 is preferably 5 to 7.
In the present invention, the method of curving the blade width W ′ is not limited, but a cut is made in 30 to 50% of the blade width W at the blade edge, and the tip portion is pushed into the inside of the basic tube 1 to make a circle. It is preferable to bend in an arc shape.
Further, as shown in FIG. 1, the effect of pushing the clay inward can be further increased by bending the tip of the curved portion of the blade base 6 in the inner diameter direction of the basic tube to form a rake angle.
In addition, the length of the foundation pipe 1 is usually 2 to 3 m. However, when the foundation pipe 1 having a length of 3 to 5 m is necessary due to the diameter and length of the column pipe, the soil quality is particularly a clay layer. In some cases, it is difficult to embed the basic pipe 1 in a single process because the earth and sand are clogged inside the basic pipe 1 and the frictional force with the inner surface of the basic pipe 1 is increased only by devising the shape of the cutting edge. .
Thus, for example, when the length of the foundation pipe 1 is 4 m, for example, when the foundation pipe 1 is excavated about 1 m from the start of excavation, the foundation pipe 1 is pulled out once, and an excavator (auger) having a screw bit at the tip is used. Then, excavation is started again after the earth and sand clogged inside the foundation pipe 1 is removed, and this operation is repeated depending on the situation. With respect to the final 1 m, the burying operation can be completed without pulling out the foundation pipe 1.
In this case, the earth and sand removed from the inside of the foundation pipe 1 is discharged. However, by putting the remaining earth into the inside of the foundation pipe 1 after the completion of excavation, the remaining earth and sand can be reduced as much as possible.
As described above, the steel pipe pole foundation in which the end portion of the foundation pipe 1 for fixing the column pipe is cut into a tooth shape and the excavation blade 4 having the cutting edge in the longitudinal direction of the foundation pipe 1 is formed around the longitudinal axis. By pushing it into the ground while rotating it, it is possible to realize a steel pipe pole foundation method that does not destroy the soil wall on the outer surface of the foundation and does not require residual soil treatment on the inner surface of the foundation.

図１及び図２に示す本発明の鋼管ポール用基礎を下記条件で実施した。
＜実施条件＞
・基礎管の径：216.3mmφ、板厚：5.8mm
・刃先角：30〜70度
・刃高Ｈ：30〜100mm
・刃幅Ｗ：50〜100mm
・湾曲させた刃元幅Ｗ´：30〜50mm（刃幅Ｗの30〜50％）
・刃元の基礎管径方向の湾曲距離Ｄ：5〜20mm The steel pipe pole foundation of the present invention shown in FIGS. 1 and 2 was carried out under the following conditions.
<Conditions for implementation>
・ Diameter of foundation pipe: 216.3mmφ, thickness: 5.8mm
・ Cutting edge angle: 30 to 70 degrees ・ Cutting height H: 30 to 100 mm
・ Blade width W: 50-100mm
・ Curved blade width W ': 30-50mm (30-50% of blade width W)
・ Bending distance D in the basic tube diameter direction at the blade base: 5 to 20 mm

その結果、図３に示す従来の掘削刃４´を用いた鋼管ポール用基礎に比べて耐力は同等で、施工コストは約30％低減することができ、本発明の効果が確認された。   As a result, the proof stress was equivalent to that of the steel pipe pole foundation using the conventional excavating blade 4 ′ shown in FIG. 3, and the construction cost could be reduced by about 30%, confirming the effect of the present invention.

本発明における鋼管ポール用基礎の実施形態を例示する側縦断面図である。It is a side longitudinal cross-sectional view which illustrates embodiment of the foundation for steel pipe poles in this invention. 本発明における鋼管ポール用基礎に用いる掘削刃を例示する詳細図である。It is detail drawing which illustrates the excavation blade used for the foundation for steel pipe poles in this invention. 従来の掘削刃を有する鋼管ポール用基礎を例示する側断面図である。It is a sectional side view which illustrates the foundation for steel pipe poles which has the conventional excavation blade.

符号の説明Explanation of symbols

１ 基礎管
２ フランジ
３ ボルト穴
４、４´ 掘削刃
５ 刃先
６ 刃元
Ｈ 刃高(mm)
Ｗ 刃幅(mm)
Ｗ´湾曲させた刃元幅(mm)
Ｄ 刃元の基礎管径方向の湾曲距離(mm) 1 Foundation pipe 2 Flange 3 Bolt hole 4, 4 'Drilling blade 5 Cutting edge 6 Cutting edge H Cutting height (mm)
W Blade width (mm)
W'curved edge width (mm)
D Bending distance in the base pipe radial direction at the blade edge (mm)

Claims (5)

柱管を固定する基礎管の端部に掘削刃を有する鋼管ポール用基礎において、
前記掘削刃は、基礎管の端部を歯形状に切り欠いて、該基礎管の長手方向に刃先を有する掘削刃を形成したことを特徴とする鋼管ポール用基礎。 In a steel pipe pole foundation having a drilling blade at the end of the foundation pipe that fixes the column pipe,
A foundation for a steel pipe pole, wherein the excavation blade is formed by cutting out an end portion of a foundation pipe into a tooth shape to form an excavation blade having a cutting edge in the longitudinal direction of the foundation pipe. 前記掘削刃の刃先角θを30〜70度、刃高Ｈを30〜100mm、刃幅Ｗを50〜100mmとしたことを特徴とする請求項１に記載の鋼管ポール用基礎。   The foundation for a steel pipe pole according to claim 1, wherein the cutting edge angle θ of the excavation blade is 30 to 70 degrees, the blade height H is 30 to 100 mm, and the blade width W is 50 to 100 mm. 前記掘削刃の刃元を前記基礎管の内側方向に湾曲させたことを特徴とする請求項１または請求項２に記載の鋼管ポール用基礎。 The foundation for a steel pipe pole according to claim 1 or 2, wherein a blade base of the excavation blade is curved inwardly of the foundation pipe. 前記湾曲させた刃元幅Ｗ´を刃幅Ｗの30〜50％、前記刃元の基礎管径方向の湾曲距離Ｄを5〜20mmとしたことを特徴とする請求項１乃至請求項３のいずれか一項に記載の鋼管ポール用基礎。   The curved blade base width W 'is 30 to 50% of the blade width W, and the bending distance D in the basic tube radial direction of the blade base is 5 to 20 mm. Steel pipe pole foundation according to any one of the above. 請求項１乃至請求項４のいずれか一項に記載の鋼管ポール用基礎を、長手軸を中心に回転させながら地面に押し込むことにより、基礎外面の土壁をくずさず、かつ、基礎内面の残土処理を必要としないことを特徴とする鋼管ポールの基礎工法。
The steel pipe pole foundation according to any one of claims 1 to 4 is pushed into the ground while rotating about the longitudinal axis, so that the soil wall on the outer surface of the foundation is not destroyed and the remaining soil on the inner surface of the foundation is removed. A steel pipe pole foundation method that does not require treatment.
JP2006044909A 2006-02-22 2006-02-22 Steel pipe pole foundation and its foundation method Expired - Fee Related JP3839461B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015163757A (en) * 2014-02-03 2015-09-10 積水樹脂株式会社 Column for guard fence and guard fence
JP2016003549A (en) * 2014-06-19 2016-01-12 大都技研株式会社 Rotary burial-type support and method for rotatively burying support
JP2018016937A (en) * 2016-07-25 2018-02-01 積水樹脂株式会社 Support post for guard fence, and guard fence

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015163757A (en) * 2014-02-03 2015-09-10 積水樹脂株式会社 Column for guard fence and guard fence
JP2016003549A (en) * 2014-06-19 2016-01-12 大都技研株式会社 Rotary burial-type support and method for rotatively burying support
JP2018016937A (en) * 2016-07-25 2018-02-01 積水樹脂株式会社 Support post for guard fence, and guard fence

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