JPH0466281B2 - - Google Patents
Info
- Publication number
- JPH0466281B2 JPH0466281B2 JP4408487A JP4408487A JPH0466281B2 JP H0466281 B2 JPH0466281 B2 JP H0466281B2 JP 4408487 A JP4408487 A JP 4408487A JP 4408487 A JP4408487 A JP 4408487A JP H0466281 B2 JPH0466281 B2 JP H0466281B2
- Authority
- JP
- Japan
- Prior art keywords
- steel pipe
- pipe pile
- measured
- length
- measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229910000831 Steel Inorganic materials 0.000 claims description 78
- 239000010959 steel Substances 0.000 claims description 78
- 238000001514 detection method Methods 0.000 claims description 25
- 230000005284 excitation Effects 0.000 claims description 24
- 238000005259 measurement Methods 0.000 claims description 15
- 230000010355 oscillation Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は埋設されている鋼管杭の長さを地上か
ら測定する鋼管杭の長さ測定方式に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a steel pipe pile length measuring method for measuring the length of a buried steel pipe pile from the ground.
（従来技術）
従来、埋設されている鋼管杭の長さを測定する
場合、鋼管杭の下端に励磁コイル、上端に圧電振
動子を取付け、励磁コイルに電気パルスを印加し
て鋼管中に超音波を発生させ、鋼管の下端からの
反射波を上端の圧電振動子で検出することによつ
て、超音波の往復伝播時間と伝播速度とから鋼管
杭の長さを求める方式が用いられている。(Prior technology) Conventionally, when measuring the length of a buried steel pipe pile, an excitation coil is attached to the lower end of the steel pipe pile and a piezoelectric vibrator is attached to the upper end, and an electric pulse is applied to the excitation coil to generate ultrasonic waves inside the steel pipe. A method is used in which the length of a steel pipe pile is determined from the reciprocating propagation time and propagation velocity of the ultrasonic wave by generating ultrasonic waves and detecting the reflected waves from the lower end of the steel pipe with a piezoelectric vibrator at the upper end.
（発明が解決しよようとする問題点）
しかしながら、この方式では、鋼管の長さが長
くなると鋼管の接続部における伝播ロスと超音波
のモード変換による不要反射によつて、反射波を
正確に判別できないという欠点があつた。(Problem to be solved by the invention) However, with this method, as the length of the steel pipe becomes longer, the reflected waves cannot be accurately reflected due to propagation loss at the joints of the steel pipes and unnecessary reflections due to mode conversion of the ultrasonic waves. The problem was that it was impossible to distinguish.
（発明の目的）
そこで、本発明の目的は、上記従来の欠点を除
去するために、電磁誘導の結合性を利用すること
によつて、地中に埋設されている長い鋼管杭の長
さを正確に測定することのできる鋼管杭の長さ測
定方式を提供することにある。(Object of the Invention) Therefore, an object of the present invention is to reduce the length of long steel pipe piles buried underground by utilizing the connectivity of electromagnetic induction in order to eliminate the above-mentioned conventional drawbacks. The object of the present invention is to provide a method for measuring the length of steel pipe piles that can be accurately measured.
（問題点を解決するための手段）
本鋼管杭の長さ測定方式における第１の発明
は、測定対象となる鋼管杭に結合可能な測定用鋼
管と、励磁信号を発生する発振回路と、前記測定
用鋼管の上端付近に該鋼管を磁心として巻かれ、
前記発振回路の出力をうけて励磁する励磁コイル
と、前記測定用鋼管の該励磁コイルの位置より下
方に該鋼管を磁心として巻かれ、該鋼管内を伝わ
る磁気信号を検出する検出コイルと、該検出コイ
ルにより検出された信号を検波する検波回路とを
含み構成され、前記測定用鋼管を地中に埋設され
た測定対象となる鋼管杭の上端に結合させること
により、前記検波回路の出力を測定して該鋼管杭
の長さを計るようにしたことを特徴とする。(Means for Solving the Problems) A first invention of the present steel pipe pile length measuring method includes: a measuring steel pipe that can be coupled to a steel pipe pile to be measured; an oscillation circuit that generates an excitation signal; The steel pipe is wound around the upper end of the measurement steel pipe as a magnetic core,
an excitation coil that is excited in response to the output of the oscillation circuit; a detection coil that is wound below the position of the excitation coil on the measurement steel pipe with the steel pipe as a magnetic core, and that detects a magnetic signal transmitted within the steel pipe; The method includes a detection circuit that detects a signal detected by a detection coil, and the output of the detection circuit is measured by coupling the measurement steel pipe to the upper end of a steel pipe pile buried underground to be measured. The length of the steel pipe pile is measured by measuring the length of the steel pipe pile.
本鋼管杭の長さ測定方式における第２の発明
は、励磁信号を発生する発振回路と、該発振回路
の出力をうける励磁コイルと、磁気信号を検出す
る検出コイルと、該検出コイルにより検出された
信号を検波する検波回路とを含み構成され、前記
励磁コイルおよび前記検出コイルを地中に埋設さ
れた測定対象となる鋼管杭のそれぞれ上端付近お
よびそれより下方位置に、かつそれぞれ該鋼管杭
が磁心となるように結合させることにより、前記
検波回路の出力を測定して該鋼管杭の長さを計る
ようにしたことを特徴とする。 The second invention in this steel pipe pile length measuring method is an oscillation circuit that generates an excitation signal, an excitation coil that receives the output of the oscillation circuit, a detection coil that detects a magnetic signal, and a magnetic signal detected by the detection coil. the excitation coil and the detection coil are placed near and below the upper end of a steel pipe pile to be measured, which is buried underground, and where the steel pipe pile is The steel pipe pile is characterized in that the length of the steel pipe pile is measured by coupling it to form a magnetic core and measuring the output of the detection circuit.
（発明の実施例）
次に、本発明による鋼管杭の長さ測定方式につ
いて実施例を挙げ、図面を参照して説明する。(Embodiments of the Invention) Next, an embodiment of a method for measuring the length of a steel pipe pile according to the present invention will be described with reference to the drawings.
第１図は、本発明による実施例の構成をブロツ
ク図により示したものである。この図において、
１は励磁信号を作り出すための発振回路であり、
例えば周波数10kHz前後のサイン波を出力する。
２は発振回路１の出力を増幅する増幅回路であ
る。３は励磁コイルであり、４は検出コイルであ
る。５は発振周波数成分のみを通過させるバンド
パスフイルタである。６は交流信号を直流に変換
するための検波回路である。７は埋設されている
測定対象の鋼管杭、８は鋼管杭７と径が等しく、
長さ２ｍ前後の測定用鋼管である。９は鋼管どう
しの磁気結合性を高めるための鋼製ベルトであ
る。 FIG. 1 is a block diagram showing the structure of an embodiment according to the present invention. In this diagram,
1 is an oscillation circuit for generating an excitation signal,
For example, it outputs a sine wave with a frequency of around 10kHz.
2 is an amplifier circuit that amplifies the output of the oscillation circuit 1. 3 is an excitation coil, and 4 is a detection coil. 5 is a bandpass filter that passes only the oscillation frequency component. 6 is a detection circuit for converting an alternating current signal into direct current. 7 is a buried steel pipe pile to be measured; 8 is a steel pipe pile with the same diameter as steel pipe pile 7;
This is a steel pipe for measurement with a length of around 2m. 9 is a steel belt for improving magnetic coupling between steel pipes.
例えば、励磁コイル３は測定用鋼管８の最上部
に200ターン前後巻かれて形成され、増幅回路２
の出力を受けて鋼管８および鋼管杭７内に誘導磁
界を発生させる。検出コイル４は鋼管８内の誘導
磁界の強さを測定するため、励磁コイル３の下方
１ｍ付近に約5000ターン巻かれている。 For example, the excitation coil 3 is formed by winding around 200 turns around the top of the measurement steel pipe 8, and the amplification circuit 2
An induced magnetic field is generated within the steel pipe 8 and the steel pipe pile 7 in response to the output. The detection coil 4 is wound around 1 m below the excitation coil 3 for approximately 5000 turns in order to measure the strength of the induced magnetic field within the steel pipe 8.
第２図は、第１図の実施例により達成される測
定の原理を説明するための図である。この図にお
いて、測定する鋼管杭７の上に直径が等しい測定
用鋼管８をのせ、その接続部に鋼製のベルト８を
巻いて磁気結合性を高める。この鋼管８上に巻か
れた励磁コイル３に発振回路１の出力を増幅して
加えると、鋼管８および鋼管杭７内とその周囲に
誘導磁界が発生する。この誘導磁界は鋼管内を通
つた後、地中及び大気中を通つて閉磁気ループを
形成する。鋼管杭７の長さが長い場合には、それ
だけ磁気抵抗が増すことになるため、鋼管杭７内
を通過する磁束が減少し、反面励磁コイル３の近
傍を通る漏洩磁束が増すことになる。したがつ
て、励磁コイル３からある程度離した位置に巻か
れた検出コイル４により鋼管内を通過する磁界の
強さを測定することによつて、予め作成されたデ
ータに基き、地上に埋設されている鋼管の長さを
知ることができる。 FIG. 2 is a diagram for explaining the principle of measurement achieved by the embodiment of FIG. 1. In this figure, a measuring steel pipe 8 having the same diameter is placed on a steel pipe pile 7 to be measured, and a steel belt 8 is wrapped around the connecting portion to improve magnetic coupling. When the output of the oscillation circuit 1 is amplified and applied to the excitation coil 3 wound on the steel pipe 8, an induced magnetic field is generated in and around the steel pipe 8 and the steel pipe pile 7. After passing through the steel pipe, this induced magnetic field forms a closed magnetic loop through the ground and the atmosphere. When the length of the steel pipe pile 7 is long, the magnetic resistance increases accordingly, so the magnetic flux passing through the steel pipe pile 7 decreases, and on the other hand, the leakage magnetic flux passing near the excitation coil 3 increases. Therefore, by measuring the strength of the magnetic field passing through the steel pipe with the detection coil 4 wound at a certain distance from the excitation coil 3, we can determine whether the You can find out the length of the steel pipe.
なお、上記の実施例においては、測定用鋼管を
備え、励磁コイルと検出コイルをこの測定用鋼管
に組合わせたのち、測定用鋼管を鋼管杭の上端に
結合させて測定するようにしているが、これとは
別に測定対象となる鋼管杭の上端付近およびそれ
より下方の位置に、それぞれ鋼管杭が磁心となる
ように直接励磁コイルと検出コイルを結合させて
も、同じ効果が得られることは言うまでもない。 In the above embodiment, a steel pipe for measurement is provided, and the excitation coil and the detection coil are combined with this steel pipe for measurement, and then the steel pipe for measurement is connected to the upper end of the steel pipe pile for measurement. Apart from this, the same effect cannot be obtained even if the excitation coil and detection coil are directly connected near the top of the steel pipe pile to be measured and below it so that the steel pipe pile serves as the magnetic core. Needless to say.
（発明の効果）
以上の説明により明らかなように、本発明によ
れば、測定対象となる鋼管杭との電磁誘導の結合
性を利用することにより、長さ鋼管杭でもその長
さを埋設後に計測できるだけでなく、既に埋設さ
れている古い鋼管杭の再利用も可能となる点、建
設等の分野に活用してその経済性を向上すべく得
られる効果は大である。(Effects of the Invention) As is clear from the above explanation, according to the present invention, by utilizing the electromagnetic induction connectivity with the steel pipe pile to be measured, the length of the steel pipe pile can be measured even after being buried. Not only can it be used for measurements, but it also makes it possible to reuse old steel pipe piles that have already been buried, which has a great effect in improving economic efficiency when used in fields such as construction.
第１図は本発明による実施例の構成を示すブロ
ツク図、第２図は、第１図の実施例により達成さ
れる測定の原理を説明するための図である。
図において、１は発振回路、２は増幅回路、３
は励磁コイル、４は検出コイル、５はフイルタ回
路、６は検波回路、７は鋼管杭、８は測定用鋼
管、９は鋼製ベルトである。
FIG. 1 is a block diagram showing the configuration of an embodiment according to the present invention, and FIG. 2 is a diagram for explaining the principle of measurement achieved by the embodiment of FIG. In the figure, 1 is an oscillation circuit, 2 is an amplifier circuit, and 3
4 is an excitation coil, 4 is a detection coil, 5 is a filter circuit, 6 is a detection circuit, 7 is a steel pipe pile, 8 is a steel pipe for measurement, and 9 is a steel belt.
Claims (1)
管と、励磁信号を発生する発振回路と、前記測定
用鋼管の上端付近に該鋼管を磁心として巻かれ、
前記発振回路の出力をうけて励磁する励磁コイル
と、前記測定用鋼管の該励磁コイルの位置より下
方に該鋼管を磁心として巻かれ、該鋼管内を伝わ
る磁気信号を検出する検出コイルと、該検出コイ
ルにより検出された信号を検波する検波回路とを
含み構成され、前記測定用鋼管を地中に埋設され
た測定対象となる鋼管杭の上端に結合させること
により、前記検波回路の出力を測定して該鋼管杭
の長さを計るようにしたことを特徴とする鋼管杭
の長さ測定方式。 ２ 励磁信号を発生する発振回路と、該発振回路
の出力をうける励磁コイルと、磁気信号を検出す
る検出コイルと、該検出コイルにより検出された
信号を検波する検波回路とを含み構成され、前記
励磁コイルおよび前記検出コイルを地中に埋設さ
れた測定対象となる鋼管杭のそれぞれ上端付近お
よびそれより下方位置に、かつそれぞれ該鋼管杭
が磁心となるように結合させることにより、前記
検波回路の出力を測定して該鋼管杭の長さを計る
ようにしたことを特徴とする鋼管杭の長さ測定方
式。[Scope of Claims] 1. A measuring steel pipe that can be coupled to a steel pipe pile to be measured, an oscillation circuit that generates an excitation signal, and a steel pipe wound around the upper end of the measuring steel pipe as a magnetic core,
an excitation coil that is excited in response to the output of the oscillation circuit; a detection coil that is wound below the position of the excitation coil on the measurement steel pipe with the steel pipe as a magnetic core, and that detects a magnetic signal transmitted within the steel pipe; The method includes a detection circuit that detects a signal detected by a detection coil, and the output of the detection circuit is measured by coupling the measurement steel pipe to the upper end of a steel pipe pile buried underground to be measured. A method for measuring the length of a steel pipe pile, characterized in that the length of the steel pipe pile is measured by measuring the length of the steel pipe pile. 2 comprises an oscillation circuit that generates an excitation signal, an excitation coil that receives the output of the oscillation circuit, a detection coil that detects a magnetic signal, and a detection circuit that detects the signal detected by the detection coil, and By coupling the excitation coil and the detection coil to positions near and below the upper end of a steel pipe pile to be measured buried underground, respectively, and with the steel pipe pile serving as the magnetic core, the detection circuit is activated. A method for measuring the length of a steel pipe pile, characterized in that the length of the steel pipe pile is measured by measuring output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4408487A JPS63212802A (en) | 1987-02-28 | 1987-02-28 | Measuring system of length of steel pipe pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4408487A JPS63212802A (en) | 1987-02-28 | 1987-02-28 | Measuring system of length of steel pipe pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63212802A JPS63212802A (en) | 1988-09-05 |
| JPH0466281B2 true JPH0466281B2 (en) | 1992-10-22 |
Family
ID=12681750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4408487A Granted JPS63212802A (en) | 1987-02-28 | 1987-02-28 | Measuring system of length of steel pipe pile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63212802A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115436431B (en) * | 2022-09-02 | 2023-06-23 | 江苏海洋大学 | Foundation pile detection method and system |
-
1987
- 1987-02-28 JP JP4408487A patent/JPS63212802A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63212802A (en) | 1988-09-05 |
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