JP2019031802A - Method and device for measuring pile penetration amount - Google Patents

Method and device for measuring pile penetration amount Download PDF

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JP2019031802A
JP2019031802A JP2017152260A JP2017152260A JP2019031802A JP 2019031802 A JP2019031802 A JP 2019031802A JP 2017152260 A JP2017152260 A JP 2017152260A JP 2017152260 A JP2017152260 A JP 2017152260A JP 2019031802 A JP2019031802 A JP 2019031802A
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pile
linear body
penetration
measuring
amount
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JP6912803B2 (en
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文彦 後藤
Fumihiko Goto
文彦 後藤
博文 百武
Hirofumi Momotake
博文 百武
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Naniwa Shisui Ind Co Ltd
Naniwa Shisui Industry Co Ltd
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Naniwa Shisui Ind Co Ltd
Naniwa Shisui Industry Co Ltd
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Abstract

To provide a method for measuring a pile penetration amount which makes measuring work of a penetration amount easy regardless of weather.SOLUTION: A method for measuring a penetration amount of a pile rotating and penetrating into a ground performs: a preparation step of, when a pile 10 or a rod 10c connected with the pile 10 is an object to be wound, fixing an end of a linear body 20 such as a thread or a string to an outer peripheral surface of the object to be wound and holding the linear body 20 extended from the object to be wound at a lateral side of an installation position of the pile 10; a penetration step of, after the preparation step, making the pile 10 rotate and penetrate in an extended state of the linear body 20 and winding the linear body 20 supplied from the lateral side of the installation position around the outer peripheral surface of the object to be wound at approximately constant height; and a measurement step of measuring a length of the pile 10 in an axial direction about an area in which the outer peripheral surface of the object to be wound is wound with the linear body 20 in the preparation step.SELECTED DRAWING: Figure 2

Description

本発明は、杭の貫入量の測定方法等に関する。   The present invention relates to a method for measuring the amount of penetration of a pile.

従来から、杭の施工時に支持層を判断する管理指標として、杭の貫入量が用いられている。例えば、杭の一回転当たりの地中への貫入量（ＰＲ値）が所定の管理値以下となった場合に、支持層を確認できたと判断して打ち止めの判断を行う。   Conventionally, the penetration amount of a pile has been used as a management index for determining a support layer during construction of the pile. For example, when the penetration amount (PR value) into the ground per one rotation of the pile is equal to or less than a predetermined management value, it is determined that the support layer has been confirmed, and the stop is determined.

特許文献１には、回転杭の回転数と回転杭の深度との関係から貫入量を求める貫入量の検出方法が記載されている。この方法では、検出器の計測値が伝達される制御装置において、回転杭の回転数及び回転杭の深度に基づいて貫入量が算出される。   Patent Document 1 describes a penetration amount detection method for obtaining a penetration amount from the relationship between the rotational speed of the rotary pile and the depth of the rotary pile. In this method, the penetration amount is calculated based on the number of rotations of the rotating pile and the depth of the rotating pile in the control device to which the measurement value of the detector is transmitted.

特許５５７５５８９号公報Japanese Patent No. 5575589

ところで、特許文献１に記載された検出方法ではコンピュータを用いて貫入量の算出を行うが、改ざんできるデジタルデータは信頼性が高いとは言えない。そのため、デジタルデータ以外の形式で、貫入量の測定結果を残すことが求められる場合がある。このような場合、従来は、杭に接続されたヤットコロッドなどに記録紙を巻き付けた後、記録紙に筆記具の先端を押し付けながら杭の回転貫入を行い、貫入量を求めるための筆跡を記録紙に残す。しかし、この場合、杭の回転貫入の際に杭には少なからずぶれが生じるために、筆記具で記録紙に描く作業が容易ではなく、さらに降雨時に作業がしにくいという問題がある。   By the way, in the detection method described in Patent Document 1, the amount of penetration is calculated using a computer, but it cannot be said that digital data that can be tampered with has high reliability. For this reason, it may be required to leave the measurement result of the penetration amount in a format other than digital data. In such a case, conventionally, after wrapping the recording paper around a Yatkorod etc. connected to the pile, the pile is rotated and penetrated while pressing the tip of the writing instrument on the recording paper, and the handwriting for obtaining the penetration amount is recorded on the recording paper. To leave. However, in this case, since the pile is slightly shaken at the time of the rotation penetration of the pile, there is a problem that it is not easy to draw on the recording paper with a writing instrument and it is difficult to work at the time of rain.

本発明は、このような事情に鑑みてなされたものであり、杭の貫入量の測定方法において、天候に拘わらず貫入量の測定作業が容易な測定方法を提供することを目的とする。   This invention is made | formed in view of such a situation, and it aims at providing the measuring method with which the measurement operation | work of an penetration amount is easy regardless of the weather in the measurement method of the penetration amount of a pile.

上述の課題を解決するべく、第１の発明は、地中に回転貫入する杭の貫入量の測定方法であって、杭または杭に接続されたロッドを巻付対象物とした場合、巻付対象物の外周面に糸又は紐などの線状体の端部を固定すると共に、杭の打設箇所の側方において巻付対象物から延ばした線状体を保持する準備ステップと、準備ステップ後に、線状体を張った状態で杭を回転貫入させて、打設箇所の側方から繰り出される線状体を略一定の高さで巻付対象物の外周面に巻き付けさせる貫入ステップと、貫入ステップにおいて巻付対象物の外周面に線状体が巻き付けられた所定区間について、杭の軸方向の長さを測定する測定ステップとを実行する。   In order to solve the above-mentioned problem, the first invention is a method for measuring the amount of penetration of a pile that rotates and penetrates into the ground, and when a rod connected to the pile or the pile is used as a winding object, A preparation step for fixing the end of a linear body such as a thread or string to the outer peripheral surface of the object, and holding the linear body extended from the winding object on the side of the place where the pile is placed, and a preparation step Later, the pile is rotated and penetrated in a state where the linear body is stretched, and the linear body fed out from the side of the placement site is wound around the outer peripheral surface of the winding object at a substantially constant height, and A measurement step of measuring the axial length of the pile is performed for a predetermined section in which the linear body is wound around the outer peripheral surface of the winding object in the penetration step.

第２の発明は、第１の発明において、線状体の端部には磁石が取り付けられ、準備ステップでは、巻付対象物の外周面に磁石を貼り付けて、線状体の端部を固定する。   According to a second invention, in the first invention, a magnet is attached to the end of the linear body, and in the preparation step, the magnet is attached to the outer peripheral surface of the winding object, and the end of the linear body is attached. Fix it.

第３の発明は、第１又は第２の発明の杭の貫入量の測定方法に用いる貫入量の測定用具であって、糸又は紐などの線状体が巻き付けられたリールと、線状体における巻き出し側の端部に取り付けられた磁石とを備えている。   A third invention is a tool for measuring the amount of penetration used in the method for measuring the amount of penetration of a pile of the first or second invention, a reel around which a linear body such as a thread or string is wound, and a linear body And a magnet attached to the end on the unwinding side.

第４の発明は、第３の発明において、リールと同じ器具に取り付けられ、リールから巻き出された線状体を通す穴又は溝が形成された高さ調整部とを備えている。   According to a fourth invention, in the third invention, there is provided a height adjusting portion attached to the same instrument as the reel and having a hole or a groove through which the linear body unwound from the reel is passed.

第１の発明では、巻付対象物に線状体の端部を固定して杭を回転貫入させて、巻付対象物に線状体を略一定の高さで巻き付け、線状体を巻き付けた所定区間について杭の軸方向の長さを測定するという手法によって杭の貫入量を測定する。そのため、回転貫入時の杭のぶれの影響を受けにくく、また降雨の影響も受けにくい。従って、天候に拘わらず貫入量の測定作業が容易な測定方法を提供することができる。   In the first invention, the end of the linear body is fixed to the winding object, the pile is rotated and penetrated, the linear body is wound around the winding object at a substantially constant height, and the linear body is wound. The amount of penetration of the pile is measured by a method of measuring the axial length of the pile for a predetermined section. For this reason, it is less susceptible to pile shake during rotation penetration, and is less susceptible to rainfall. Therefore, it is possible to provide a measurement method that allows easy measurement of the penetration amount regardless of the weather.

また、第２及び第３の各発明では、巻付対象物に磁石を貼り付けて線状体の端部を固定するため、巻付対象物への線状体の端部の固定作業が容易である。   In each of the second and third inventions, since the end of the linear body is fixed by attaching a magnet to the winding object, the fixing work of the end of the linear body to the winding object is easy. It is.

第４の発明では、リールから巻き出された線状体を通す穴又は溝が形成された高さ調整部が、リールと同じ器具に取り付けられる。そのため、線状体を略一定の高さで巻付対象物の外周面に巻き付けさせるための器具又は部品（第４の発明では、高さ調整部）について、同様の機能の器具等を地盤に設置する場合に比べて小さくすることができる。   In 4th invention, the height adjustment part in which the hole or groove | channel which lets the linear body unwound from the reel pass is formed is attached to the same instrument as a reel. Therefore, with respect to an instrument or component for wrapping the linear body around the outer peripheral surface of the winding object at a substantially constant height (in the fourth invention, a height adjustment unit), an instrument having the same function is used on the ground. It can be made smaller than when it is installed.

（ａ）杭の貫入量の測定方法における準備ステップの一工程を説明するための模式図、（ｂ）杭の貫入量の測定方法における準備ステップの別の一工程を説明するための模式図(A) Schematic diagram for explaining one process of the preparation step in the measurement method of the penetration amount of the pile, (b) Schematic diagram for explaining another process of the preparation step in the measurement method of the penetration quantity of the pile （ａ）杭の貫入量の測定方法における貫入ステップを説明するための模式図、（ｂ）杭の貫入量の測定方法における測定ステップを説明するための模式図(A) Schematic diagram for explaining the penetration step in the measurement method of the penetration amount of the pile, (b) Schematic diagram for explaining the measurement step in the measurement method of the penetration amount of the pile 杭の貫入量の測定する際の三脚等の配置を表す平面図Plan view showing the arrangement of tripods etc. when measuring the penetration of piles （ａ）その他の実施形態における貫入量の測定用具を説明するための図、（ｂ）その他の実施形態における別の貫入量の測定用具を説明するための図(A) The figure for demonstrating the measurement tool of the penetration amount in other embodiment, (b) The figure for demonstrating the measurement tool of another penetration quantity in other embodiment.

以下、図１−図４を参照しながら、本発明の実施形態を詳細に説明する。なお、以下の実施形態は、本発明の一例であって、本発明、その適用物、あるいはその用途の範囲を制限することを意図するものではない。   Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. The following embodiment is an example of the present invention, and is not intended to limit the scope of the present invention, its application, or its use.

［１．杭の施工方法の概要］
まず杭（鋼管杭）１０の施工方法について説明する。杭１０の施工では、杭１０の打設長に応じて、１本又は複数本の杭１０ａ，１０ｂを用いる。複数本の杭１０ａ，１０ｂを用いる場合、まず下杭１０ａを回転貫入して埋設した後に、下杭１０ａに継ぎ杭１０ｂ（中杭又は上杭）を溶接又は機械式継手などで接合し、継ぎ杭１０ｂを回転貫入する。 [1. Outline of pile construction method]
First, the construction method of the pile (steel pipe pile) 10 will be described. In the construction of the pile 10, one or a plurality of piles 10 a and 10 b are used according to the driving length of the pile 10. When using a plurality of piles 10a, 10b, first, the lower pile 10a is rotated through and embedded, and then the joint pile 10b (middle pile or upper pile) is joined to the lower pile 10a by welding or a mechanical joint, etc. The pile 10b is rotated and penetrated.

下杭１０ａには、図１及び図２に示すように、先端に螺旋羽根１１が設けられたものが使用される。各杭１０ａ，１０ｂは、杭打ち機２５への建込みを行った後に、杭打ち機２５によって回転貫入（回転圧入）される。杭打ち機２５によって杭１０ａ，１０ｂを回転させると、螺旋羽根１１の回転による推進力によって杭１０ａ，１０ｂが圧入される。   As shown in FIGS. 1 and 2, a lower pile 10 a having a spiral blade 11 at the tip is used. Each pile 10 a, 10 b is rotationally penetrated (rotated press-fitted) by the pile driving machine 25 after being built into the pile driving machine 25. When the piles 10 a and 10 b are rotated by the pile driving machine 25, the piles 10 a and 10 b are press-fitted by the propulsive force generated by the rotation of the spiral blade 11.

鋼管杭１０の施工では、所定数の杭１０ａ，１０ｂが埋設されると、図１（ａ）に示すヤットコロッド１０ｃの建込みを行い、杭打ち機２５によってヤットコロッド１０ｃを回転させて杭１０ａ，１０ｂをさらに回転貫入する。ヤットコロッド１０ｃは、一番上の杭１０ｂに接続される。そして、下杭１０ａの下端が打設完了深度の少し手前の深さに到達すると、杭１０ａ，１０ｂの打設を一時停止し、貫入量の測定を行う。貫入量の測定についての詳細は後述する。そして、貫入量の測定結果によって支持層を確認できた場合に打ち止めの判断を行う。杭１０の打ち止め判断後、ヤットコロッド１０ｃは引き抜かれる。   In the construction of the steel pipe pile 10, when a predetermined number of piles 10a and 10b are embedded, the yat-cold rod 10c shown in FIG. 1 (a) is installed, and the pile-driving machine 25 rotates the yat-cold rod 10c to pile 10a. , 10b is further rotated through. The Yat Korod 10c is connected to the top pile 10b. And when the lower end of the lower pile 10a reaches the depth just before the completion depth of placement, the placement of the piles 10a and 10b is temporarily stopped and the penetration amount is measured. Details of the measurement of the penetration amount will be described later. Then, when the support layer can be confirmed based on the measurement result of the penetration amount, determination of stopping is performed. After determining whether the pile 10 is to be stopped, the yat corod 10c is pulled out.

［２．杭の貫入量の測定方法］
次に、杭１０の貫入量の測定方法について詳細に説明する。実施形態に係る貫入量の測定方法では、準備ステップ、貫入ステップ、及び測定ステップがこの順番で行われる。 [2. Measuring method of pile penetration]
Next, the measuring method of the penetration amount of the pile 10 is demonstrated in detail. In the penetration amount measuring method according to the embodiment, the preparation step, the penetration step, and the measurement step are performed in this order.

準備ステップでは、作業者が、貫入量を測定する対象の杭１０の打設箇所の側方に三脚１５を設置し、図１（ａ）に示すように、三脚１５の脚頭部１５ａにリール１６（貫入量の測定用具）を設置する。リール１６は、水平回転可能に脚頭部１５ａ上に固定される。具体的に、図１（ａ）において波線で囲まれた拡大図に示すように、リール１６における筒状部（胴部）１６ａの内側に棒状部材１７を通し、脚頭部１５ａの貫通孔にも棒状部材１７を通した状態で、リール１６は回転軸が上下方向を向く姿勢で設置される。なお、リール１６の筒状部１６ａには水糸２０が巻き付けられ、水糸２０の端部（巻き出し側の端部）には磁石１８が取り付けられている。水糸２０としては、ヤットコロッド１０ｃの外周面上に巻き付けた場合に目立つ色（例えば赤色）のものを用いる。また、棒状部材１７が通されたリール１６が脚頭部１５ａ上から動くことを防止するために、重しによって棒状部材１７をリール１６に押しつけてもよい。   In the preparation step, the operator installs the tripod 15 on the side of the place where the pile 10 whose penetration is to be measured is placed, and the reel is mounted on the leg head 15a of the tripod 15 as shown in FIG. 16 (tool for measuring penetration amount) is installed. The reel 16 is fixed on the leg head 15a so as to be horizontally rotatable. Specifically, as shown in an enlarged view surrounded by a wavy line in FIG. 1A, a rod-like member 17 is passed inside a cylindrical portion (body portion) 16a of the reel 16, and is passed through a through hole of the leg head portion 15a. Further, the reel 16 is installed in such a state that the rotation axis is directed in the vertical direction with the rod-shaped member 17 being passed. A water string 20 is wound around the cylindrical portion 16a of the reel 16, and a magnet 18 is attached to an end portion (end portion on the unwinding side) of the water yarn 20. As the water thread 20, one having a conspicuous color (for example, red) when wound on the outer peripheral surface of the Yatco rod 10 c is used. Further, in order to prevent the reel 16 through which the rod-shaped member 17 is passed from moving on the leg head 15a, the rod-shaped member 17 may be pressed against the reel 16 by weight.

また、準備ステップでは、作業者が、杭１０の打設箇所と三脚１５との間に、ヤットコロッド１０ｃに水糸２０が巻き付く高さを一定にするための糸通し用部材１９を設ける。本実施形態では、糸通し用部材１９として、穴を有する糸通し部１９ａが端に設けられた棒状杭（ペグ）を用いる。また、穴を有する糸通し部１９ａは、その穴全体が、リール１６の筒状部１６ａの下端より下側又は筒状部１６ａの上端より上側になるように設ける。なお、糸通し用部材１９の代わりに、別途に三脚を設置して、その三脚上に糸通し部１９ａを取り付けてもよい。   Further, in the preparation step, the operator provides a threading member 19 between the place where the pile 10 is placed and the tripod 15 so as to make the height at which the water thread 20 wraps around the yat corod 10c constant. In this embodiment, as the threading member 19, a rod-like pile (peg) having a threading part 19a having a hole at its end is used. Further, the threading portion 19a having a hole is provided such that the whole hole is located below the lower end of the cylindrical portion 16a of the reel 16 or above the upper end of the cylindrical portion 16a. Instead of the threading member 19, a tripod may be separately installed and the threading portion 19a may be attached on the tripod.

そして、作業者は、脚頭部１５ａ上のリール１６から水糸２０を横方向に引っ張り出し、図１（ｂ）に示すように、糸通し部１９ａに水糸２０を通した後に、ヤットコロッド１０ｃの外周面に磁石１８を貼り付けて水糸２０の端部を固定する。作業者は、糸通し部１９ａから磁石１８の貼付箇所までの間は水糸２０が略水平に張った状態にする。つまり、ヤットコロッド１０ｃの外周面では、磁石１８が糸通し部１９ａの穴と略同じ高さに固定される。そして、この状態で貫入ステップを行う。   Then, the operator pulls the water thread 20 laterally from the reel 16 on the leg head 15a and passes the water thread 20 through the threading part 19a as shown in FIG. A magnet 18 is attached to the outer peripheral surface of 10c to fix the end of the water string 20. The operator keeps the water thread 20 stretched substantially horizontally between the threading part 19a and the place where the magnet 18 is applied. In other words, the magnet 18 is fixed at substantially the same height as the hole of the threading portion 19a on the outer peripheral surface of the Yattco rod 10c. In this state, the penetration step is performed.

貫入ステップでは、図２（ａ）に示すように、杭打ち機２５によってヤットコロッド１０ｃを回転させて杭１０の打設を再開する。ヤットコロッド１０ｃの回転中は、水糸２０にテンションがかかるようにする。そうすると、リール１６から水糸２０が巻き出されて、水糸２０がヤットコロッド１０ｃの外周面に巻き付いていく。水糸２０は糸通し部１９ａに通されてヤットコロッド１０ｃ側が略水平になっているため、リール１６から水糸２０が巻き出される高さは変化するが、水糸２０がヤットコロッド１０ｃの外周面に巻き付く高さは略一定になる。ヤットコロッド１０ｃが回転貫入されることで、水糸２０はヤットコロッド１０ｃに螺旋状に巻き付く。   In the penetration step, as shown in FIG. 2 (a), the pile driving machine 25 rotates the yat corod 10c to resume the driving of the pile 10. During the rotation of the Yattco rod 10c, the tension is applied to the water string 20. Then, the water string 20 is unwound from the reel 16, and the water thread 20 is wound around the outer peripheral surface of the Yatco rod 10c. Since the water thread 20 is passed through the threading part 19a and the Yatco rod 10c side is substantially horizontal, the height at which the water thread 20 is unwound from the reel 16 changes, but the water thread 20 is outside the Yatco rod 10c. The height wrapped around the surface is substantially constant. As the Yattco rod 10c rotates and penetrates, the water string 20 is spirally wound around the Yatco rod 10c.

また、杭１０の打設再開後は、１人の作業者がレベル測量器（図示省略）を覗き込み、打設再開後の杭１０の貫入量を目視で見続ける、作業者は、打設再開後の貫入量が例えば２０ｃｍになったタイミングで、杭打ち機２５のオペレーターに「打設の終了」を伝えて杭打ち機２５によるヤットコロッド１０ｃの回転を停止させる。   In addition, after the placement of the pile 10 is resumed, one worker looks into the level surveying instrument (not shown) and continues to visually observe the penetration amount of the pile 10 after the placement is resumed. At the timing when the penetration amount after resumption becomes 20 cm, for example, the operator of the pile driving machine 25 is notified of the “end of placing” and the rotation of the yat corod 10c by the pile driving machine 25 is stopped.

なお、図３は、杭の貫入量の測定する際の三脚１５等の配置を表す平面図である。図１及び図２は、三脚１５とヤットコロッド１０ｃとが重ならないように、便宜的に左側から杭打ち機２５、ヤットコロッド１０ｃ及び三脚１５を記載しているが、本実施形態では、図３に示すように、杭打ち機２５の運転席２５ａ側に三脚１５を設置している。このように配置するのは、杭打ち機２５のオペレーターがいる運転席２５ａの前方又は左側に、レベル測量器及びその作業者が配置する様にし、杭打ち機２５のオペレーターに「打設の終了」の合図を伝えやすくする為である。なお、杭の貫入量の測定時の平面配置は、図３の配置に限定されない。   In addition, FIG. 3 is a top view showing arrangement | positioning of the tripod 15 grade | etc., When measuring the penetration amount of a pile. 1 and 2 show the pile driving machine 25, the yat corod 10c, and the tripod 15 from the left side for the sake of convenience so that the tripod 15 and the yat corod 10c do not overlap. In this embodiment, FIG. As shown, the tripod 15 is installed on the driver's seat 25a side of the pile driving machine 25. In this way, the leveling instrument and its operator are arranged in front of or on the left side of the driver seat 25a where the operator of the pile driver 25 is located. This is to make it easier to convey the signal. In addition, the planar arrangement | positioning at the time of the measurement of the penetration | invasion amount of a pile is not limited to the arrangement | positioning of FIG.

次に、測定ステップを行う。作業者３０は、図２（ｂ）に示すように、コンベックス（巻尺）、物差しなどの長さを測定する長さ測定具２１を用いて、ヤットコロッド１０ｃの外周面に水糸２０が巻き付けられた全区間のうち最後の一巻き分（所定区間）について、ヤットコロッド１０ｃの軸方向の測定長Ｌを測定する。この測定状況は、別の作業者が写真で撮影する。   Next, a measurement step is performed. As shown in FIG. 2 (b), the operator 30 uses the length measuring tool 21 that measures the length of a convex (tape measure), a ruler, or the like to wind the water thread 20 around the outer peripheral surface of the Yatko rod 10 c. For the last one turn (predetermined section) of all the sections, the measurement length L in the axial direction of the yat corod 10c is measured. This measurement situation is photographed by another operator.

ここで、長さ測定具２１を用いて測定した測定長Ｌは、打設終了直前に最後の１回転で回転貫入された杭１０の貫入長と等しくなる。そのため、最後の一巻き分の軸方向の長さを測ることで、１回転当たりの貫入量（ＰＲ値）の測定結果が得られる。作業者は、ＰＲ値の測定結果を杭打ち機２５における貫入量のデジタル計測値（最後の１回転の計測値）と照合してＰＲ値の測定結果の妥当性を確認できた場合、支持層を確認できたものと判断する。   Here, the measurement length L measured using the length measuring tool 21 is equal to the penetration length of the pile 10 that has been rotationally penetrated by the last one rotation just before the placement is completed. Therefore, the measurement result of the penetration amount (PR value) per rotation can be obtained by measuring the axial length of the last one turn. If the operator collates the measurement result of the PR value with the digital measurement value (the measurement value of the last one rotation) of the penetration amount in the pile driving machine 25 and can confirm the validity of the measurement result of the PR value, the support layer Judge that it was confirmed.

［３．実施形態の効果など］
本実施形態では、ヤットコロッド１０ｃに水糸２０の端部を固定して杭１０を回転貫入させて、ヤットコロッド１０ｃに水糸２０を略一定の高さで巻き付け、水糸２０を巻き付けた所定区間について杭１０の軸方向の長さを測定するという手法によって杭１０の貫入量を測定する。そのため、回転貫入時の杭１０のぶれの影響を受けにくく、また降雨の影響も受けにくい。従って、天候に拘わらず貫入量の測定作業が容易な測定方法を提供することができる。また、貫入量の測定時は地盤が固いために杭を逆回転させる場合があるが、そのような事態の時も容易に測定作業をやり直すことができる。 [3. Effects of the embodiment]
In this embodiment, the end of the water thread 20 is fixed to the Yatko rod 10c, the pile 10 is rotated and penetrated, the water thread 20 is wound around the Yatko rod 10c at a substantially constant height, and the water string 20 is wound around the predetermined length. The penetration amount of the pile 10 is measured by a method of measuring the axial length of the pile 10 for the section. Therefore, it is hard to receive the influence of the shake of the pile 10 at the time of rotation penetration, and is hard to receive the influence of rainfall. Therefore, it is possible to provide a measurement method that allows easy measurement of the penetration amount regardless of the weather. Further, when measuring the amount of penetration, the pile may be rotated in reverse because the ground is hard, but the measurement work can be easily performed again in such a situation.

また、ヤットコロッド１０ｃに磁石１８を貼り付けて水糸２０の端部を固定するため、ヤットコロッド１０ｃへの水糸２０の端部の固定作業が容易である。   In addition, since the magnet 18 is attached to the Yatco rod 10c to fix the end of the water string 20, the fixing operation of the end of the water string 20 to the Yatco rod 10c is easy.

［４．その他の実施形態］
上述の実施形態において、リール１６は必須ではなく、ヤットコロッド１０ｃの回転貫入中に作業者が、ヤットコロッド１０ｃの外周面の貼付箇所から延び出た水糸２０を一定の高さで持ってテンションをかけながら、水糸２０を繰り出してもよい。また、ヤットコロッド１０ｃの外周面の貼付箇所から延び出た水糸２０を糸通し部１９ａに通して作業者が持ってもよい。 [4. Other Embodiments]
In the above-described embodiment, the reel 16 is not essential, and the operator holds the water thread 20 extending from the sticking position on the outer peripheral surface of the yat corod 10c at a certain height while the yat corod 10c is rotating and penetrating. The water yarn 20 may be unwound while applying. Further, the operator may hold the water thread 20 extending from the pasting position on the outer peripheral surface of the yat corod 10c through the threading part 19a.

また、上述の実施形態では、線状体２０として水糸を用いたが、これに限定されず紐、ロープなど他のものを用いてもよい。   Moreover, in the above-mentioned embodiment, although the water thread was used as the linear body 20, it is not limited to this, You may use other things, such as a string and a rope.

また、上述の実施形態において、磁石１８によってヤットコロッド１０ｃの外周面に水糸２０を貼り付けたが、テープ等の他の手段で水糸２０を貼り付けてもよい。   Moreover, in the above-mentioned embodiment, although the water thread | yarn 20 was affixed on the outer peripheral surface of the yattkorod 10c with the magnet 18, you may affix the water thread | yarn 20 with other means, such as a tape.

また、上述の実施形態では、本発明の貫入量の測定方法を直杭に適用した例について説明したが、本発明の貫入量の測定方法を斜杭に適用してもよい。   Moreover, although the above-mentioned embodiment demonstrated the example which applied the measuring method of the penetration amount of this invention to the straight pile, you may apply the measuring method of the penetration amount of this invention to a diagonal pile.

また、上述の実施形態では、地盤に対して糸通し用部材１９を設けたが、図４に示すように、リール１６と同じ器具に取り付ける部品として、リール１６から巻き出された水糸２０を通す穴又は溝が形成された高さ調整部２３を貫入量の測量用具３５に設けてもよい。図４（ａ）では、高さ調整部２３が、リール１６と共に回転しない三脚１５の脚頭部１５ａに固定されている。高さ調整部２３には、穴を有する糸通し部２３ａが設けられている。リール１６から巻き出された水糸２０は、糸通し部２３ａの穴に通される。また、図４（ｂ）では、脚頭部１５ａに棒状部材１７を固定しており、高さ調整部２３は棒状部材１７に固定されている。高さ調整部２３は棒状部材１７を介して三脚１５に取り付けられている。高さ調整部２３には、溝を有する糸通し部２３ａが設けられている。リール１６から巻き出された水糸２０は、糸通し部２３ａの溝（上側が開放された溝）に通される。   In the above-described embodiment, the threading member 19 is provided on the ground. However, as shown in FIG. 4, the water thread 20 unwound from the reel 16 is used as a part to be attached to the same instrument as the reel 16. You may provide the height adjustment part 23 in which the hole or groove | channel to let pass was provided in the surveying tool 35 of penetration amount. In FIG. 4A, the height adjusting unit 23 is fixed to the leg head 15 a of the tripod 15 that does not rotate with the reel 16. The height adjusting portion 23 is provided with a threading portion 23a having a hole. The water thread 20 unwound from the reel 16 is passed through the hole of the threading part 23a. In FIG. 4B, the rod-shaped member 17 is fixed to the leg head portion 15 a, and the height adjusting unit 23 is fixed to the rod-shaped member 17. The height adjusting unit 23 is attached to the tripod 15 via the rod-shaped member 17. The height adjusting portion 23 is provided with a threading portion 23a having a groove. The water thread 20 unwound from the reel 16 is passed through a groove (a groove whose upper side is opened) of the threading part 23a.

また、上述の実施形態では、貫入ステップにおいてヤットコロッド１０ｃの外周面に糸２０が巻き付けられた区間のうち最後の一巻き分について杭１０の軸方向の長さを測定したが、複数回の巻かれた区間について杭１０の軸方向の長さを測定し、巻付け回数で測定長を割ってＰＲ値の測定結果を算出してもよい。   Moreover, in the above-mentioned embodiment, although the length of the axial direction of the pile 10 was measured about the last one turn among the sections where the thread | yarn 20 was wound around the outer peripheral surface of the Yatko rod 10c in the penetration step, You may measure the length of the pile 10 in the axial direction about the section, and divide the measurement length by the number of windings, and may calculate the measurement result of PR value.

本発明は、杭の貫入量の測定方法等に適用可能である。   The present invention can be applied to a method for measuring the amount of penetration of a pile.

１０ 杭
１０ａ 下杭
１０ｂ 継ぎ杭
１０ｃ ヤットコロッド（ロッド）
１５ 三脚
１６ リール（貫入量の測定用具）
１８ 磁石
１９ 糸通し用部材
２０ 水糸（線状体）
２１ 長さ測定具
２５ 杭打ち機 10 Pile 10a Lower Pile 10b Joint Pile 10c Yatko Rod (Rod)
15 Tripod 16 Reel (Tool for measuring penetration)
18 Magnet 19 Threading member 20 Water thread (linear body)
21 Length measuring tool 25 Pile driver

Claims (4)

地中に回転貫入する杭の貫入量の測定方法であって、
前記杭または前記杭に接続されたロッドを巻付対象物とした場合、前記巻付対象物の外周面に糸又は紐などの線状体の端部を固定すると共に、前記杭の打設箇所の側方において前記巻付対象物から延ばした前記線状体を保持する準備ステップと、
前記準備ステップ後に、前記線状体を張った状態で前記杭を回転貫入させて、前記打設箇所の側方から繰り出される前記線状体を略一定の高さで前記巻付対象物の外周面に巻き付けさせる貫入ステップと、
前記貫入ステップにおいて前記巻付対象物の外周面に前記線状体が巻き付けられた所定区間について、前記杭の軸方向の長さを測定する測定ステップとを実行することを特徴とする、貫入量の測定方法。 A method for measuring the amount of penetration of a pile that penetrates into the ground,
When the pile or the rod connected to the pile is a winding object, the end of the linear body such as a thread or string is fixed to the outer peripheral surface of the winding object, and the place where the pile is placed A preparation step for holding the linear body extended from the winding object on the side of the winding;
After the preparation step, the pile is rotated and penetrated in a state where the linear body is stretched, and the linear body fed out from the side of the placement site is arranged at a substantially constant height on the outer periphery of the winding object. An intrusion step to wrap around the surface,
A measuring step of measuring an axial length of the pile with respect to a predetermined section in which the linear body is wound around an outer peripheral surface of the winding object in the penetration step; Measuring method. 前記線状体の端部には磁石が取り付けられ、
前記準備ステップでは、前記巻付対象物の外周面に前記磁石を貼り付けて、前記線状体の端部を固定することを特徴とする、請求項１に記載の貫入量の測定方法。 A magnet is attached to the end of the linear body,
The penetration amount measuring method according to claim 1, wherein, in the preparation step, the end of the linear body is fixed by attaching the magnet to the outer circumferential surface of the winding object. 請求項１又は２に記載された杭の貫入量の測定方法に用いる貫入量の測定用具であって、
糸又は紐などの線状体が巻き付けられたリールと、
前記線状体における巻き出し側の端部に取り付けられた磁石とを備えていることを特徴とする、貫入量の測定用具。 A tool for measuring the amount of penetration used in the method for measuring the amount of penetration of a pile according to claim 1 or 2,
A reel around which a linear body such as a thread or string is wound;
A penetration amount measuring tool, comprising: a magnet attached to an unwinding side end of the linear body. 前記リールと同じ器具に取り付けられ、前記リールから巻き出された線状体を通す穴又は溝が形成された高さ調整部とを備えていることを特徴とする、請求項３に記載の貫入量の測定用具。   The penetration according to claim 3, further comprising: a height adjusting portion which is attached to the same instrument as the reel and has a hole or groove through which a linear body unwound from the reel is passed. Quantity measuring tool.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5226853A (en) * 1975-08-26 1977-02-28 Nippon Fume Can Kk Automatic recording method for driven length of pile
JPH0649941U (en) * 1992-12-04 1994-07-08 株式会社原子力エンジニアリング Power transmission mechanism with rotation amount measurement function
JPH0995944A (en) * 1995-10-03 1997-04-08 Ohbayashi Corp Recording apparatus for piling work
JP2002021076A (en) * 2000-07-05 2002-01-23 Nippon Steel Corp System and method for controlling construction of rotatively press-fitted pile
JP2012062623A (en) * 2010-09-14 2012-03-29 Nippon Sharyo Seizo Kaisha Ltd Detection method of penetration amount using pile driver and construction method of rotary pile

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5226853A (en) * 1975-08-26 1977-02-28 Nippon Fume Can Kk Automatic recording method for driven length of pile
JPH0649941U (en) * 1992-12-04 1994-07-08 株式会社原子力エンジニアリング Power transmission mechanism with rotation amount measurement function
JPH0995944A (en) * 1995-10-03 1997-04-08 Ohbayashi Corp Recording apparatus for piling work
JP2002021076A (en) * 2000-07-05 2002-01-23 Nippon Steel Corp System and method for controlling construction of rotatively press-fitted pile
JP2012062623A (en) * 2010-09-14 2012-03-29 Nippon Sharyo Seizo Kaisha Ltd Detection method of penetration amount using pile driver and construction method of rotary pile

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