JP2006132175A - Method of estimating tension resistance of underground anchor, and measuring instrument for use in the method - Google Patents

Method of estimating tension resistance of underground anchor, and measuring instrument for use in the method Download PDF

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JP2006132175A
JP2006132175A JP2004321786A JP2004321786A JP2006132175A JP 2006132175 A JP2006132175 A JP 2006132175A JP 2004321786 A JP2004321786 A JP 2004321786A JP 2004321786 A JP2004321786 A JP 2004321786A JP 2006132175 A JP2006132175 A JP 2006132175A
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underground anchor
tensile strength
hydraulic motor
underground
anchor
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JP4667009B2 (en
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Shinji Kuroiwa
伸二 黒岩
Hisatoku Inukai
久徳 犬飼
Kunio Iwata
邦男 岩田
Yoshio Mitsui
義夫 三井
Makoto Tamai
誠 玉井
Sumio Kawamura
純男 川村
Tomoyuki Kiyohara
智之 清原
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Asahi Tec Corp
Chubu Electric Power Co Inc
Toenec Corp
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Asahi Tec Corp
Chubu Electric Power Co Inc
Toenec Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To easily estimate tension resistance of an embedded underground anchor. <P>SOLUTION: There is provided a method of estimating tension resistance of the underground anchor which is embedded in the ground and has a spiral excavating blade at a front end thereof. According to the method, when the underground motor is rotatively driven by a hydraulic motor and embedded in the ground at a predetermined depth, by using a measuring means for measuring driving hydraulic pressure of the hydraulic motor, the tension resistance of the underground anchor is estimated based on the driving hydraulic pressure of the hydraulic motor measured by the measuring means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、配電線や電話線等の電柱、又は交通信号機のポール等の柱状物を支持する支線、あるいは建築構造物等の所定の構造物を支持する支線を地中において支持する地中アンカの耐張力を推定する地中アンカの耐張力の推定方法、及びその推定方法で用いられる計器に関する。   The present invention provides an underground anchor for supporting a branch line for supporting a columnar object such as a power pole such as a distribution line and a telephone line, a pole of a traffic signal, or a predetermined structure such as a building structure in the ground. The present invention relates to a method for estimating the tensile strength of an underground anchor that estimates the tensile strength of the ground, and an instrument used in the estimation method.

本出願人の中の一部の出願人（以下の出願人も同じ。）は、先に、電柱等の柱状物や建築物等の構造物（以下、「電柱」を例に説明する。）を支持する支線を地中で支えるための地中アンカを提案している（特許文献１〜４参照）。これら提案に係る地中アンカの構造については、本発明の実施の形態の項で詳述するが、棒状の軸部の先端側に螺旋状の掘削刃が間欠的に複数個設けられて構成されていて、その軸部の先端側と反対側が電柱を地面に立設するときに用いられる穴掘建柱車の回転部、いわゆるオーガの先端に所定の施工工具を介して取付けられるように構成されている。したがって、この提案に係る地中アンカは、穴掘建柱車のオーガが回転されると、地中を掘削するように進入するので、地中アンカを地中深くに容易に埋設することができる。そして、その地中に埋設された地中アンカには、電柱を支持する鋼線からなる支線が地中アンカに設けられた支線棒に取付けられるように構成されている。   Some applicants among the present applicants (the same applies to the following applicants) are first columnar objects such as utility poles and structures such as buildings (hereinafter, “electric poles” will be described as an example). An underground anchor for supporting a branch line supporting the ground in the ground is proposed (see Patent Documents 1 to 4). The structure of the underground anchor according to these proposals will be described in detail in the section of the embodiment of the present invention, and is configured by intermittently providing a plurality of spiral excavating blades on the tip side of the rod-shaped shaft portion. And the opposite side of the tip of the shaft part is configured to be attached to a rotating part of a digging pillar used for standing a power pole on the ground, a so-called tip of an auger via a predetermined construction tool. ing. Therefore, since the underground anchor according to this proposal enters so as to excavate the underground when the auger of the drilling column car is rotated, the underground anchor can be easily buried deep in the ground. . And in the underground anchor embed | buried in the ground, the branch line which consists of the steel wire which supports an electric pole is comprised so that it may attach to the branch line rod provided in the underground anchor.

ところで、地中アンカの支線を支持する力、すなわち、地中アンカの耐張力は、所定以上でなければ電柱を支持することができない。換言すれば、地中に埋設されている地中アンカが電柱を支持するために要求される所定の力以下で地中から引き抜かれたのでは、地中アンカの役目を果たすことができない。例えば、電柱を支持する支線に要求される力が９８ｋＮ（１０ｔｏｎ）であるとき、支線に９８ｋＮの引抜力を加えたときに地中アンカが引抜かれたときは、地中アンカの役目を果たすことができない。この引抜力に対抗する力である地中アンカの耐張力は、地中アンカを構成する軸部に設けられた掘削刃の地中に対する抵抗力に起因し、その抵抗力は、地中アンカの埋設される地質に大きく左右される性質を有している。   By the way, the power pole cannot be supported unless the force for supporting the branch line of the underground anchor, that is, the tensile strength of the underground anchor, is not less than a predetermined value. In other words, if the underground anchor buried in the ground is pulled out from the ground below a predetermined force required to support the utility pole, it cannot function as an underground anchor. For example, when the force required for the branch line supporting the utility pole is 98 kN (10 ton), if the underground anchor is pulled out when a pulling force of 98 kN is applied to the branch line, it will serve as the underground anchor. I can't. The tensile strength of the underground anchor, which is the force against this pulling force, is caused by the resistance force of the excavating blades provided on the shaft portion constituting the underground anchor to the ground, and the resistance force is the resistance of the underground anchor. It has properties that are greatly influenced by the geology to be buried.

そこで、本出願人は、地中アンカの埋設地点の地質に合った地中アンカを適切に選択できるようにした測定工具を提案している（特許文献５，６参照）。この測定工具は、棒状を呈した簡単な構成からなり、穴掘建柱車のオーガの先端に取付けてＮ値（このＮ値は、ＪＩＳＡ１２１９に示されるもので、外径５．１ｃｍ、内径３．５ｃｍ、長さ８１．０ｃｍの中空の測定具（サンプラー）を地中へ打ち込む際に生ずる地盤の抵抗から求められ、上述の測定具を質量６３．５ｋｇ（約６２２．３Ｎ）のハンマーを７５ｃｍの高さから自由落下させ、その測定具を３０ｃｍ打ち込むのに必要な打撃数Ｎから求められるものである。）を極めて容易に測定することができる特長を有している。この測定工具により地中アンカの埋設する地点のＮ値が分かるので、つまり、地中アンカの埋設地点の地質が分かるので、その地質に合った大きさの掘削刃を有する地中アンカを選んで埋設することができる。地中アンカが適切に選択されると、その地中アンカは、所定以上の耐張力を有することができる。
特開２０００−１８５０号公報 特開２００１−５９２２１号公報 特開２００１−１８２０５８号公報 特開２００１−２７１３４５号公報 特開２００３−２２７１２６号公報 特開２００３−２３９２８２号公報 Therefore, the present applicant has proposed a measuring tool that can appropriately select an underground anchor that matches the geology of the buried point of the underground anchor (see Patent Documents 5 and 6). This measuring tool has a simple configuration in the shape of a rod, and is attached to the tip of an auger of a digging column car. It is obtained from the resistance of the ground generated when a hollow measuring tool (sampler) with a length of 0.5 cm and a length of 81.0 cm is driven into the ground. It is obtained from the number N of hits required to drop the tool freely from the height of the tool and drive the measuring tool by 30 cm.). This measurement tool can be used to determine the N value at the point where the underground anchor is buried, that is, the geology of the buried anchor point is known. Can be buried. When the underground anchor is appropriately selected, the underground anchor can have a tensile strength higher than a predetermined value.
JP 2000-1850 A JP 2001-59221 A JP 2001-182058 A JP 2001-271345 A JP 2003-227126 A JP 2003-239282 A

しかしながら、上記提案に係る地中アンカを埋設する際には、地中アンカの埋設地点のＮ値を測定して使用する地中アンカの種類を選択し、地中アンカが所定の耐張力が得られるようにしているため、地中アンカの埋設作業には、地質の測定の工程を必要としていた。このため、このような地質の測定の工程を必要とすることなく、地中アンカの耐張力を推定できるようにすることが望まれていた。   However, when burying the underground anchor according to the above proposal, the type of the underground anchor to be used is selected by measuring the N value of the underground anchor, and the underground anchor has a predetermined tensile strength. Therefore, the underground anchoring work required a geological measurement process. Therefore, it has been desired to be able to estimate the tensile strength of the underground anchor without requiring such a geological measurement step.

そこで、本発明は、上記要望に応えるためになされたものであって、その目的は、地中アンカの埋設地点のＮ値測定を必要とすることなく、埋設された地中アンカの耐張力を推定できるようにした地中アンカの耐張力の推定方法を提供するとともに、その方法で用いられる計器を提供することにある。   Therefore, the present invention has been made to meet the above-mentioned demand, and its purpose is to increase the tensile strength of the buried underground anchor without requiring the N value measurement of the buried anchor point. An object of the present invention is to provide a method for estimating the tensile strength of an underground anchor that can be estimated, and to provide an instrument used in the method.

本発明に係る地中アンカの耐張力の推定方法は、上記目的を達成するために、請求項１に記載の発明は、先端側に螺旋状の掘削刃を有する地中に埋設された地中アンカの耐張力の推定方法であって、前記地中アンカが油圧モータによって回転させられて所定の深さに埋設されたときのその油圧モータの駆動油圧を計測する計測手段を用いて、その計測手段で計測された油圧モータの駆動油圧に基づいてその地中アンカの耐張力を推定することを特徴としている。
本発明に係る地中アンカの耐張力の推定方法で用いられる計器は、上記目的を達成するために、請求項２に記載の発明は、先端側に螺旋状の掘削刃を有する地中アンカが油圧モータによって回転させられて所定の深さに埋設されたときのその油圧モータの駆動油圧に基づいてその地中アンカの耐張力を推定するときに用いられる計器であって、前記計器の本体の目盛は、前記油圧モータの駆動油圧に対応した前記地中アンカの耐張力を示す耐張力目盛であることを特徴としている。
本発明の請求項３に記載の地中アンカの耐張力の推定方法で用いられる計器は、耐張力目盛の他に油圧モータの駆動油圧を示す油圧目盛が設けられていることを特徴としている。 In order to achieve the above object, a method for estimating the tensile strength of an underground anchor according to the present invention includes the following: An anchor tension resistance estimation method using a measuring means for measuring a driving hydraulic pressure of the hydraulic motor when the underground anchor is rotated by a hydraulic motor and buried at a predetermined depth. It is characterized in that the tensile strength of the underground anchor is estimated based on the drive hydraulic pressure of the hydraulic motor measured by the means.
In order to achieve the above object, the instrument used in the method for estimating the tensile strength of the underground anchor according to the present invention is characterized in that the underground anchor having a spiral excavating blade on the tip side is provided. An instrument used for estimating the tensile strength of the underground anchor based on the drive hydraulic pressure of the hydraulic motor when rotated by a hydraulic motor and buried in a predetermined depth, The scale is a tension resistance scale indicating the tensile strength of the underground anchor corresponding to the drive hydraulic pressure of the hydraulic motor.
The instrument used in the method for estimating the tensile strength of the underground anchor according to claim 3 of the present invention is characterized in that a hydraulic scale indicating the drive hydraulic pressure of the hydraulic motor is provided in addition to the tensile strength scale.

本発明の請求項１に記載の地中アンカの耐張力の推定方法は、地中アンカが油圧モータによって回転させられて所定の深さに埋設されたときのその油圧モータの駆動油圧を計測する計測手段を用いて、その計測手段で計測された油圧モータの駆動油圧に基づいてその地中アンカの耐張力を推定するので、地中アンカを埋設するときの油圧モータの駆動油圧を用いて地中アンカの耐張力が推定できるから、事前のＮ値測定等の地質調査を省略することができ、地中アンカの埋設作業をより省力化することができる。
本発明の請求項２に記載の地中アンカの耐張力の推定方法で用いられる計器は、計器の本体の目盛は、油圧モータの駆動油圧に対応した地中アンカの耐張力を示す耐張力目盛であるから、地中アンカの耐張力を容易に知ることができる。
本発明の請求項３に記載の地中アンカの耐張力の推定方法で用いられる計器は、耐張力目盛の他に油圧モータＭの駆動油圧を示す油圧目盛が設けられているので、地中アンカを埋設するときの駆動油圧も容易に知ることができる。 According to a first aspect of the present invention, there is provided a method for estimating a tensile strength of an underground anchor, which measures a drive hydraulic pressure of the hydraulic motor when the underground anchor is rotated by a hydraulic motor and buried at a predetermined depth. Since the tensile strength of the underground anchor is estimated based on the driving hydraulic pressure of the hydraulic motor measured by the measuring means using the measuring means, the ground pressure can be determined using the hydraulic pressure of the hydraulic motor when the underground anchor is buried. Since the tensile strength of the middle anchor can be estimated, the geological survey such as N-value measurement in advance can be omitted, and the work of burying the underground anchor can be further saved.
The instrument used in the method for estimating the tensile strength of the underground anchor according to claim 2 of the present invention is such that the scale of the main body of the instrument indicates the tensile resistance of the underground anchor corresponding to the drive hydraulic pressure of the hydraulic motor. Therefore, the tensile strength of the underground anchor can be easily known.
The instrument used in the method for estimating the tensile strength of the underground anchor according to claim 3 of the present invention is provided with a hydraulic scale indicating the drive hydraulic pressure of the hydraulic motor M in addition to the tensile resistance scale. The drive hydraulic pressure when embedding can be easily known.

以下、本発明を実施するための最良の形態を図面に基づいて説明する。図１は、本発明の一実施の形態に係る地中アンカの耐張力の推定方法を実施するための油圧系を示したもので、この油圧系は、実際は後述の図３の穴掘建柱車に設けられる。   Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. FIG. 1 shows a hydraulic system for carrying out a method for estimating the tensile strength of an underground anchor according to an embodiment of the present invention. This hydraulic system is actually a drilling column in FIG. Provided in the car.

図１中、Ｐは、油溜Ｖ内のオイルＯを吸引管Ｐ0 を介して吸引して加圧する油圧ポンプである。この油圧ポンプＰで加圧されたオイルＯは、供給管Ｐ1 を介して後述するオーガ等を回転させる油圧モータＭに供給されるように構成されているとともに、油圧モータＭから返送されるオイルＯは、返送管Ｐ2 を介して油溜Ｖに返送されるように構成されている。そして、上記供給管Ｐ1 の途中には、供給管Ｐ1 内の油圧、すなわち油圧モータＭの駆動油圧を計測するための本発明の計測手段に相当する計器Ｇが設けられている。   In FIG. 1, P is a hydraulic pump that sucks and pressurizes the oil O in the oil reservoir V through the suction pipe P0. The oil O pressurized by the hydraulic pump P is configured to be supplied to a hydraulic motor M that rotates an auger or the like to be described later via a supply pipe P1, and the oil O returned from the hydraulic motor M is configured to be supplied. Is configured to be returned to the oil sump V via the return pipe P2. A meter G corresponding to the measuring means of the present invention for measuring the hydraulic pressure in the supply pipe P1, that is, the drive hydraulic pressure of the hydraulic motor M, is provided in the supply pipe P1.

この計器Ｇは、穴掘建柱車又は土木機械の運転台に設けられ、周知のアナログ式の圧力計からなり、その計器の本体の目盛板ｇ0 には、円弧状に地中アンカの耐張力を示す耐張力目盛ｇ1 と油圧モータＭの駆動油圧を示す油圧目盛ｇ2 とが並行して設けられ、これら両目盛ｇ1 ，ｇ2 は、針ｇ′により同時に指示されるように構成されている。これら両目盛ｇ1 ，ｇ2 の関係については後述する。   This instrument G is provided in the cab of a digging column or civil engineering machine, and is composed of a well-known analog pressure gauge. The scale plate g0 of the instrument body has a circular arc-shaped anchor anchor strength. And a hydraulic scale g2 indicating the driving hydraulic pressure of the hydraulic motor M are provided in parallel, and both scales g1 and g2 are configured to be simultaneously indicated by the needle g '. The relationship between these graduations g1 and g2 will be described later.

なお、この計器Ｇは、ここではアナログ式としたが、これを周知のアナログデジタル変換回路及び数値表示回路を用いたデジタル式にすることもできる。計器Ｇをデジタル式にしたときは、地中アンカの耐張力及び油圧モータＭの駆動油圧を数値で具体的に認識することができる。また、上述の例では、計器Ｇには、耐張力目盛ｇ1 の他に油圧目盛ｇ2 を設けるようにしたが、耐張力目盛ｇ1 のみとすることもできる。しかし、上述のように、耐張力目盛ｇ1 の他に油圧目盛ｇ2 も設けるようにすると、油圧モータＭの駆動油圧を知ることができるので便利である。   The instrument G is an analog type here, but it can also be a digital type using a known analog-digital conversion circuit and numerical display circuit. When the instrument G is digital, the tensile strength of the underground anchor and the drive hydraulic pressure of the hydraulic motor M can be specifically recognized by numerical values. In the above-described example, the instrument G is provided with the hydraulic scale g2 in addition to the tensile strength scale g1, but it may be provided with only the tensile strength scale g1. However, as described above, it is convenient to provide the hydraulic scale g2 in addition to the tension-proof scale g1 because the drive hydraulic pressure of the hydraulic motor M can be known.

計器Ｇの目盛板ｇ0 に設けられた耐張力目盛ｇ1 と油圧目盛ｇ2 との関係は、地中アンカにおける本出願人の長年の経験と過去の多くの実践に基づいて得られたデータから決められている。すなわち、本出願人は、地中アンカを所定の深さに埋設したときの油圧モータＭの駆動油圧と、その所定の深さに埋設された地中アンカの耐張力との間に一定の比例関係があることを確認した。これにより、従来のように、事前に地中アンカの埋設地点のＮ値を測定することなく地中アンカの埋設時の油圧から耐張力を推定することができるのである。油圧モータＭの駆動油圧と地中アンカの耐張力の比例関係は、土質やアンカの形状（種類）、大きさによって異なるため、予めこれらの条件により比例関係を求めておき、適宜計器Ｇの耐張力目盛ｇ1 を変更して用いる。図２にこの比例関係の一例を示す。   The relationship between the tension-proof scale g1 and the hydraulic scale g2 provided on the scale board g0 of the instrument G is determined from the data obtained based on the applicant's many years of experience in the underground anchor and many past practices. ing. That is, the applicant of the present invention has a certain proportionality between the drive hydraulic pressure of the hydraulic motor M when the underground anchor is embedded at a predetermined depth and the tensile strength of the underground anchor embedded at the predetermined depth. Confirmed that there is a relationship. As a result, the tensile strength can be estimated from the hydraulic pressure at the time of burying the underground anchor without measuring the N value at the burial point of the underground anchor beforehand. The proportional relationship between the hydraulic pressure of the hydraulic motor M and the tensile strength of the underground anchor varies depending on the soil, the shape (type) and size of the anchor. Change the tension scale g1. FIG. 2 shows an example of this proportional relationship.

図２において、縦軸は地中アンカの最大耐張力（ｋＮ）及び横軸はその地中アンカ埋設停止時の油圧（ＭＰａ）である。この実験に供された地盤は、土丹地盤であり、図２中の塗潰し印は切土地盤であり、白抜き印は盛土地盤である。また、図２の中、９０ｃｍ、１１０ｃｍ及び１３５ｃｍは、後述の１４０φの地中アンカの埋設深さを表している。そして、図２中、太い比例関係を示す線は、最小２乗法（図２中の式参照）により求められたもので、σ＝１０．４は標準偏差を表している。   In FIG. 2, the vertical axis represents the maximum tensile strength (kN) of the underground anchor and the horizontal axis represents the hydraulic pressure (MPa) when the underground anchor is stopped. The ground used for this experiment is the Dotan ground, the filled mark in FIG. 2 is the cut ground, and the white mark is the embankment. Moreover, 90 cm, 110 cm, and 135 cm in FIG. 2 represent the embedding depth of the below-mentioned 140 φ underground anchor. In FIG. 2, a line indicating a thick proportional relationship is obtained by the least square method (see the formula in FIG. 2), and σ = 10.4 represents a standard deviation.

以下、地中アンカの耐張力の推定方法についてより具体的に説明する。ここで使用される地中アンカは標準型と呼ばれるもので、上部の最も大径の螺旋状の掘削刃（後述の図３の２ｄ参照）の直径が１４０ｍｍ（以下、１４０φのように示す。）で、軸棒（後述の図３の１参照）の長さ４５０ｍｍで、その軸棒の最も太い部分（最も大径の螺旋状の掘削刃の部分）の直径が５０φである。以下、この地中アンカを１４０φの地中アンカとして説明する。   Hereinafter, the method for estimating the tensile strength of the underground anchor will be described more specifically. The underground anchor used here is called a standard type, and the diameter of the uppermost spiral excavating blade (see 2d in FIG. 3 to be described later) is 140 mm (hereinafter referred to as 140φ). The length of the shaft rod (see 1 in FIG. 3 described later) is 450 mm, and the diameter of the thickest portion of the shaft rod (the portion of the largest-sized spiral excavating blade) is 50φ. Hereinafter, this underground anchor will be described as an underground anchor of 140φ.

図２に示すように、この１４０φの地中アンカを穴掘建柱車を用いて土丹地盤において地面から所定深さまで埋設したとき、つまり、地中アンカの上部に接続される支線棒（後述の図３の７参照）の上端部が地面から所定高さとなるように地中アンカを埋設したとき（通常、このときの地面から地中アンカの先端部（後述の図３の３参照）までの距離は約１．５ｍである。）のオーガを回転する油圧モータの駆動圧力が１３．１ＭＰａ以上であれば地中アンカの必要耐張力である６３．７ｋＮ以上を確保できることが確認できた（図２の鎖線参照）。   As shown in FIG. 2, when the underground anchor of 140φ is buried to a predetermined depth from the ground in the earthen ground using a digging column car, that is, a branch bar connected to the upper part of the underground anchor (described later) (See 7 in FIG. 3) When the underground anchor is buried so that the upper end of the upper end of the ground is at a predetermined height from the ground (usually from the ground at this time to the tip of the underground anchor (see 3 in FIG. 3 described later)) It was confirmed that if the driving pressure of the hydraulic motor that rotates the auger of the auger is 13.1 MPa or more, the necessary tensile strength of the underground anchor can be secured at 63.7 kN or more ( (See chain line in FIG. 2).

図３は、本発明に係る地中アンカの耐張力の推定方法を適用した地中アンカの埋設を示したもので、先ず、地中アンカＡから説明する。この地中アンカＡは、鋳鉄製からなり、所定長さの軸棒１を有し、この軸棒１の先端側（図３では下端部側）には、間欠的に複数個（図示の例では４個）の螺旋状の掘削刃２ａ〜２ｄが一体的に設けられている。これら螺旋状の掘削刃２ａ〜２ｄは、上方に行くほど、すなわち、螺旋状の掘削刃２ａよりも２ｂ、また、２ｂよりも２ｃの方が大径となるように構成されている。これら螺旋状の掘削刃２ａ〜２ｄの地中に進入する側及び外周は、尖鋭に形成されている。また、軸棒１の先端部分は、周知のドリルと同様の切込刃を有するドリル部３に形成されている。   FIG. 3 shows the underground anchor burial to which the underground anchor tension estimating method according to the present invention is applied. First, the underground anchor A will be described. The underground anchor A is made of cast iron and has a shaft rod 1 having a predetermined length. A plurality of intermittent anchors (example shown in the figure) are provided on the distal end side (lower end portion in FIG. 3) of the shaft rod 1. 4) spiral excavation blades 2a to 2d are integrally provided. These spiral excavation blades 2a to 2d are configured such that the diameter of the spiral excavation blades 2a to 2d increases, that is, 2b is larger than the spiral excavation blade 2a, and 2c is larger than 2b. The sides and outer circumferences of these spiral excavating blades 2a to 2d entering the ground are sharply formed. Moreover, the front-end | tip part of the axial rod 1 is formed in the drill part 3 which has the same cutting blade as a well-known drill.

軸棒１のドリル部３と反対側、すなわち、螺旋状の掘削刃２ａ〜２ｄの設けられている側と反対側の上端側で、地中アンカＡが地中に埋設されたときの地面側には、軸棒１の径よりも少し大きな径を有するつば部４が設けられているとともに、そのつば部４よりも上端部は、四角柱からなる角柱部５に形成されている。そして、この角柱部５には、穴５ａが設けられていて、後述する支線棒が取付けられるように構成されている。   The ground side when the underground anchor A is buried in the ground on the opposite side to the drill portion 3 of the shaft rod 1, that is, the upper end side opposite to the side where the spiral excavating blades 2a to 2d are provided. Is provided with a collar portion 4 having a diameter slightly larger than the diameter of the shaft 1, and an upper end portion of the collar portion 4 is formed in a rectangular column portion 5 made of a square column. And this prismatic part 5 is provided with the hole 5a, and it is comprised so that the branch bar mentioned later may be attached.

図３中、６は施工工具であって、この施工工具６は、内部に支線棒７を収容することのできる１本の筒状体からなり、その一端側（図３では下端側）には、地中アンカＡの角柱部５が着脱自在に嵌合される角穴６ａに形成されているとともに、その他端側（図３では上端側）は、穴堀建柱車（図示せず）のオーガ１０に設けられている角柱状の挿入口１０ａに挿入される角柱の装着部６ｂが形成されている。そして、この施工工具６の内部は、角穴６ａに開口した支線棒７を収納するのに十分な容積を有する空間６ｃが形成されている。上記支線棒７は、地中アンカＡの角柱部５に設けられた穴５ａに取付けられるように構成され、下部に設けられているリング７ａを介して穴５ａに回動自在に接続されるように構成されている。   In FIG. 3, 6 is a construction tool, and this construction tool 6 is composed of one cylindrical body that can accommodate the branch bar 7 therein, and at one end thereof (the lower end side in FIG. 3) In addition, the square pillar portion 5 of the underground anchor A is formed in a square hole 6a to be detachably fitted, and the other end side (upper end side in FIG. 3) is a hole-drilling column car (not shown). A prismatic mounting portion 6b to be inserted into a prismatic insertion port 10a provided in the auger 10 is formed. And inside this construction tool 6, the space 6c which has sufficient volume to accommodate the branch bar 7 opened to the square hole 6a is formed. The branch bar 7 is configured to be attached to a hole 5a provided in the prism 5 of the underground anchor A, and is rotatably connected to the hole 5a via a ring 7a provided in the lower part. It is configured.

図３中、６ｄは貫通孔であって、施工工具６の上部側に貫通して設けられている。したがって、施工工具６内に支線棒７が挿入され、その支線棒７のリング７ｂが挿入されている状態で、貫通孔６ｄにボルト６ｅが挿入され、そのボルト６ｅにナット（図示せず）が螺合されると、支線棒７を施工工具６に連結させることができる。   In FIG. 3, reference numeral 6 d denotes a through hole, which is provided penetrating on the upper side of the construction tool 6. Accordingly, the branch bar 7 is inserted into the construction tool 6, and the bolt 6e is inserted into the through-hole 6d with the ring 7b of the branch bar 7 inserted, and a nut (not shown) is inserted into the bolt 6e. When screwed, the branch bar 7 can be connected to the construction tool 6.

地中アンカＡを施工工具６を用いて地中に埋設するには、先ず、施工工具６の装着部６ｂがオーガ１０の挿入口１０ａに挿入される。そして、脱落防止のために、オーガ１０の先端に設けられている貫通孔１０ｂ及び装着部６ｂに設けられている貫通孔６ｆにボルト１０ｃが挿入されてナット１０ｄで固定される。   In order to embed the underground anchor A in the ground using the construction tool 6, first, the mounting portion 6 b of the construction tool 6 is inserted into the insertion port 10 a of the auger 10. Then, in order to prevent falling off, a bolt 10c is inserted into a through hole 10b provided at the tip of the auger 10 and a through hole 6f provided in the mounting portion 6b and fixed with a nut 10d.

次いで、施工工具６内に支線棒７が挿入され、角穴６ａ内に地中アンカＡの角柱部５が嵌合される。そして、施工工具６に設けられている貫通孔６ｄにボルト６ｅが挿入されるとともに、そのボルト６ｅにナット（図示せず）が螺合され、これにより、支線棒７と施工工具６とが連結状態に保たれる。   Next, the branch rod 7 is inserted into the construction tool 6, and the prism 5 of the underground anchor A is fitted into the square hole 6a. And while the bolt 6e is inserted in the through-hole 6d provided in the construction tool 6, a nut (not shown) is screwed into the bolt 6e, and thereby the branch bar 7 and the construction tool 6 are connected. Kept in a state.

オーガ１０を押圧状態を保ちながら油圧モータＭを回転すると、地中アンカＡは、螺旋状の掘削刃２ａ〜２ｄの作用により地中に埋設され始められる。そして、地中アンカＡの下部が所定深さに埋設されるとボルト６ｅが抜き取られる。地中アンカＡが所定深さに埋設されたとき、すなわち、支線棒７の上端部側が地面から所定高さとなったときに、穴掘建柱車の運転台に設置されている計器Ｇにより耐張力が読取られる。この読取られた耐張力の値が所定値以上であれば、油圧モータＭの回転が停止されてオーガ１０が上方へ移動させられる。これにより施工工具６は地中アンカＡから外れて、地中アンカＡ及び支線棒７の下端部は、地中に埋設された状態に保たれる。その後、支線棒７の上部に設けられたリング部７ｂには、図示しないワイヤが取付けられて電柱が支持される。なお、計器Ｇから読取られた耐張力が所定の値に達しないときは、埋設された地中アンカＡは電柱を支持するための所定の耐張力が得られないことを意味しているので、この場合は、油圧モータＭがこれまでの回転方向と逆の方向に回転（逆回転）させられる。この逆回転により地中アンカＡが徐々に地表に出されて地中から取り出される。   When the hydraulic motor M is rotated while the auger 10 is kept pressed, the underground anchor A starts to be buried in the ground by the action of the spiral excavation blades 2a to 2d. Then, when the lower part of the underground anchor A is buried at a predetermined depth, the bolt 6e is extracted. When the underground anchor A is buried at a predetermined depth, that is, when the upper end side of the branch bar 7 reaches a predetermined height from the ground, it is resisted by the instrument G installed in the cab of the digging pillar car. The tension is read. If the read tensile strength value is equal to or greater than a predetermined value, the rotation of the hydraulic motor M is stopped and the auger 10 is moved upward. As a result, the construction tool 6 is detached from the underground anchor A, and the underground anchor A and the lower ends of the branch rods 7 are kept buried in the ground. Thereafter, a wire (not shown) is attached to the ring portion 7b provided on the upper portion of the branch bar 7 to support the utility pole. When the tensile strength read from the instrument G does not reach a predetermined value, the buried underground anchor A means that the predetermined tensile strength for supporting the utility pole cannot be obtained. In this case, the hydraulic motor M is rotated (reversely rotated) in the direction opposite to the conventional rotation direction. By this reverse rotation, the underground anchor A is gradually brought out to the ground surface and taken out from the ground.

なお、上述の例では、耐張力の表示は計器を用いてアナログ式又はデジタル式で行うようにしたが、その計器の表示とともに、あるいは、この計器の表示に代えて音声、ブザー又は表示ランプで行うようにしてもよい。音声で耐張力を表示するときは、具体的な数値が音声案内され、ブザーで耐張力を表示するときは、所定の耐張力を満たすときの音色と、その所定の耐張力を満たさないときの音色とが区別して報知され、そして、表示ランプで耐張力を表示するときは、所定の耐張力を満たすときの表示色と、その所定の耐張力を満たさないときの表示色とが区別して報知される。   In the above-described example, the tension resistance is displayed in an analog or digital manner using a meter. However, a voice, a buzzer, or a display lamp is used together with the meter display or in place of the meter display. You may make it perform. When displaying the tensile strength with voice, specific numerical values are voice-guided, and when displaying the tensile strength with a buzzer, the tone when the predetermined tensile strength is met, and when the predetermined tensile strength is not met When the tone strength is displayed on the indicator lamp, the display color when the specified tension is satisfied and the display color when the specified tension is not satisfied are notified. Is done.

本発明の一実施の形態に係る地中アンカの耐張力の推定方法を実施するための油圧系の概略構成図である。It is a schematic block diagram of the hydraulic system for enforcing the tension | tensile_strength estimation method of the underground anchor which concerns on one embodiment of this invention. 油圧モータの油圧と地中アンカの耐張力との関係を示すグラフである。It is a graph which shows the relationship between the oil_pressure | hydraulic of a hydraulic motor, and the tensile strength of a underground anchor. 油圧モータが穴堀建柱車に設けられているときの説明図である。It is explanatory drawing when a hydraulic motor is provided in the hole excavation pillar car.

符号の説明Explanation of symbols

Ｐ 油圧ポンプ
Ｍ 油圧モータ
Ｇ 計器（計測手段）
ｇ′ 針
ｇ1 耐張力目盛
ｇ2 油圧目盛
Ａ 地中アンカ
６ 施工工具
７ 支線棒
１０ オーガ P Hydraulic pump M Hydraulic motor G Instrument (measuring means)
g 'Needle g1 Tensile Strength Scale g2 Hydraulic Scale A Underground Anchor 6 Construction Tool 7 Branch Bar 10 Auger

Claims (3)

先端側に螺旋状の掘削刃を有する地中に埋設された地中アンカの耐張力の推定方法であって、
前記地中アンカが油圧モータによって回転させられて所定の深さに埋設されたときのその油圧モータの駆動油圧を計測する計測手段を用いて、その計測手段で計測された油圧モータの駆動油圧に基づいてその地中アンカの耐張力を推定することを特徴とする地中アンカの耐張力の推定方法。 A method for estimating the tensile strength of an underground anchor embedded in the ground having a spiral excavating blade on the tip side,
When the underground anchor is rotated by the hydraulic motor and buried at a predetermined depth, the measurement hydraulic pressure is measured by the measurement means to measure the drive hydraulic pressure of the hydraulic motor. A method for estimating the tensile strength of an underground anchor, wherein the tensile strength of the underground anchor is estimated. 先端側に螺旋状の掘削刃を有する地中アンカが油圧モータによって回転させられて所定の深さに埋設されたときのその油圧モータの駆動油圧に基づいてその地中アンカの耐張力を推定するときに用いられる計器であって、
前記計器の本体の目盛は、前記油圧モータの駆動油圧に対応した前記地中アンカの耐張力を示す耐張力目盛であることを特徴とする計器。 Estimating the tensile strength of the underground anchor based on the hydraulic pressure of the hydraulic motor when the underground anchor having a spiral excavating blade on the tip side is rotated by the hydraulic motor and buried at a predetermined depth An instrument sometimes used,
The scale of the main body of the meter is a tension-proof scale indicating the tensile strength of the underground anchor corresponding to the drive hydraulic pressure of the hydraulic motor. 請求項２に記載の計器において、耐張力目盛の他に油圧モータの駆動油圧を示す油圧目盛が設けられていることを特徴とする計器。   3. The meter according to claim 2, further comprising a hydraulic scale indicating a driving hydraulic pressure of the hydraulic motor in addition to the tension-proof scale.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06212634A (en) * 1993-01-13 1994-08-02 Giken Seisakusho Co Ltd Pile press-fitting pull-out machine
JPH0674637U (en) * 1993-03-26 1994-10-21 三和機材株式会社 Pile support layer detector
JP2000001850A (en) * 1998-06-15 2000-01-07 Asahi Tec Corp Underground anchor
JP2000080650A (en) * 1998-03-10 2000-03-21 Nippon Steel Corp Construction management method for rotary press-fit pile
JP2001271345A (en) * 2000-03-27 2001-10-05 Asahi Tec Corp Working tool for underground anchor
JP2002021076A (en) * 2000-07-05 2002-01-23 Nippon Steel Corp System and method for controlling construction of rotatively press-fitted pile

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06212634A (en) * 1993-01-13 1994-08-02 Giken Seisakusho Co Ltd Pile press-fitting pull-out machine
JPH0674637U (en) * 1993-03-26 1994-10-21 三和機材株式会社 Pile support layer detector
JP2000080650A (en) * 1998-03-10 2000-03-21 Nippon Steel Corp Construction management method for rotary press-fit pile
JP2000001850A (en) * 1998-06-15 2000-01-07 Asahi Tec Corp Underground anchor
JP2001271345A (en) * 2000-03-27 2001-10-05 Asahi Tec Corp Working tool for underground anchor
JP2002021076A (en) * 2000-07-05 2002-01-23 Nippon Steel Corp System and method for controlling construction of rotatively press-fitted pile

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