JPH06109862A - Method for detecting object part in underground pipe - Google Patents
Method for detecting object part in underground pipeInfo
- Publication number
- JPH06109862A JPH06109862A JP26127592A JP26127592A JPH06109862A JP H06109862 A JPH06109862 A JP H06109862A JP 26127592 A JP26127592 A JP 26127592A JP 26127592 A JP26127592 A JP 26127592A JP H06109862 A JPH06109862 A JP H06109862A
- Authority
- JP
- Japan
- Prior art keywords
- receiving
- coil
- pig
- buried pipe
- transmitting coil
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は埋設管に於ける全周減肉
等の重大欠陥や、継手部等の対象個所の検知方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting a serious defect such as a reduction in the entire circumference of a buried pipe and a target portion such as a joint portion.
【０００２】[0002]
【従来の技術】埋設配管の腐食状況を検査したり継手等
を検出するための装置の一つとして、リモートフィール
ド渦流式探傷装置がある。2. Description of the Related Art A remote field eddy current flaw detector is one of the devices for inspecting the corrosion condition of buried pipes and detecting joints and the like.
【０００３】この探傷装置は、送信コイルと受信コイル
を所定距離隔てて装置した探傷センサを、距離が測定可
能な走行装置により埋設配管内に走行させ、送信コイル
から受信コイルまでの電磁波の伝播時間の変化により腐
食減肉や貫通孔等の欠陥または継手等の対象個所を検出
すると共に、探傷センサの走行距離により前記欠陥等の
対象個所を測定するものである。In this flaw detection device, a flaw detection sensor having a transmission coil and a reception coil separated from each other by a predetermined distance is made to travel in a buried pipe by a traveling device capable of measuring the distance, and the propagation time of electromagnetic waves from the transmission coil to the reception coil is increased. Is used to detect defects such as corrosion thinning and through holes, or target points such as joints, and to measure the target points such as defects based on the running distance of the flaw detection sensor.
【０００４】[0004]
【発明が解決しようとする課題】走行距離による位置の
測定は一次元尺度による測定であるから、配管が湾曲し
ていたりすると欠陥等を検出した位置を二次元位置とし
て正確に測定することはできない。Since the measurement of the position based on the traveled distance is based on the one-dimensional scale, it is impossible to accurately measure the position where the defect is detected as the two-dimensional position when the pipe is curved. .
【０００５】従ってこのような欠陥等を検出した配管個
所を、掘削により補修するような場合には、無駄な掘削
をしたり、掘削をした個所にたまたま近接していた他の
配管を誤認してしまうというような不都合を生じる場合
がある。本発明は、このような課題を解決することを目
的とするものである。Therefore, in the case of repairing a pipe part where such a defect is detected by excavation, wasteful excavation is performed or other pipes that happen to be close to the excavated part are mistakenly recognized. In some cases, such inconvenience may occur. The present invention aims to solve such problems.
【０００６】[0006]
【課題を解決するための手段】上述した課題を解決する
ために本発明では、埋設管内を移動させながら内蔵した
送信コイルから交流磁界を発生させるピグと、送信コイ
ルからの交流磁界を受信する受信コイルを設けた受信装
置とを使用し、受信コイルと送信コイルの相対位置関係
を一定とするように受信装置をピグの移動に追随して移
動させながら、受信コイルにより送信コイルからの交流
磁界の受信レベルを連続的に測定し、受信レベルが変化
した範囲により対象個所の存在及び位置を検知する方法
を提案する。In order to solve the above-mentioned problems, according to the present invention, a pig for generating an AC magnetic field from a built-in transmission coil while moving in a buried pipe and a receiver for receiving the AC magnetic field from the transmission coil. Using a receiving device provided with a coil, while moving the receiving device following the movement of the pig so that the relative positional relationship between the receiving coil and the transmitting coil is constant, the receiving coil causes the AC magnetic field from the transmitting coil to change. We propose a method of continuously measuring the reception level and detecting the existence and position of the target location according to the range in which the reception level changes.
【０００７】また本発明は、かかる方法を適用するにあ
たり、受信コイルと送信コイルの相対位置関係を一定と
するように受信装置をピグの移動に追随して移動させる
ために、受信装置には、左右対称に配設した第１の一対
の受信コイルと、この第１の一対の受信コイルの対称軸
上の前後に設けた第２の一対の受信コイルとから成り、
これらの受信コイルの巻軸を上記対称軸と平行に構成し
た位置調整手段を設けることを提案する。そして、この
ような方法に於いて、これらの受信コイルのいずれかを
受信レベル測定に兼用する構成とすることを提案する。Further, according to the present invention, in applying such a method, in order to move the receiving device following the movement of the pig so that the relative positional relationship between the receiving coil and the transmitting coil is constant, It is composed of a first pair of receiving coils arranged symmetrically, and a second pair of receiving coils provided in front of and behind the axis of symmetry of the first pair of receiving coils.
It is proposed to provide a position adjusting means in which the winding axes of these receiving coils are arranged in parallel with the axis of symmetry. Then, in such a method, it is proposed that any one of these receiving coils is also used for the reception level measurement.
【０００８】また本発明は、上記方法を地上への投影位
置が既知な埋設管を対象とした場合に適用するにあたっ
ては、受信コイルと送信コイルの相対位置関係を一定と
するように受信装置をピグの移動に追随して移動させる
ために、ピグは移動距離を測定可能な駆動手段により移
動させる構成とすることを提案する。そして、この方法
を適用するに於いては、駆動手段は移動距離を測定可能
なケーブルや管内自走機構とすることを提案する。ま
た、駆動手段はピグに埋設管内の気体の圧力を受ける部
材を設けて構成し、埋設管内のガス流量に対応するピグ
の移動速度を積算して移動距離を測定することを提案す
る。Further, when the above method is applied to a buried pipe whose projection position on the ground is known, the present invention provides a receiving device so that the relative positional relationship between the receiving coil and the transmitting coil is constant. In order to move the pig following the movement of the pig, it is proposed that the pig be moved by a driving unit capable of measuring the movement distance. Then, in applying this method, it is proposed that the driving means is a cable or a self-propelled mechanism in a tube capable of measuring the moving distance. Further, it is proposed that the driving means is configured by providing the pig with a member for receiving the pressure of the gas in the buried pipe, and integrating the moving speed of the pig corresponding to the gas flow rate in the buried pipe to measure the moving distance.
【０００９】[0009]
【作用】以上の構成に於いて、ピグは、内蔵した送信コ
イルから交流磁界を発生させながらワイヤによる牽引ま
たは押し込みにより駆動したり、自走駆動機構により駆
動したり、あるいはガスの圧力で駆動する等により対象
とする埋設管内を移動させる。一方、受信装置は、それ
に内蔵した受信コイルと送信コイルの相対位置関係を一
定とするようにピグの移動に追随して移動させながら、
受信コイルにより送信コイルからの交流磁界の受信レベ
ルを連続的に測定する。In the above structure, the pig is driven by pulling or pushing with a wire while generating an AC magnetic field from the built-in transmission coil, driven by a self-propelled drive mechanism, or driven by gas pressure. Move inside the target buried pipe by the above. On the other hand, the receiving device moves while following the movement of the pig so that the relative positional relationship between the receiving coil and the transmitting coil incorporated therein becomes constant,
The reception level of the AC magnetic field from the transmission coil is continuously measured by the reception coil.
【００１０】このように受信コイルと送信コイルの相対
位置関係を一定とすると、送信コイルから埋設管を経て
受信コイルにより受信される交流磁界の受信レベルは、
埋設管の状態に左右される。If the relative positional relationship between the receiving coil and the transmitting coil is fixed in this way, the receiving level of the AC magnetic field received by the receiving coil from the transmitting coil through the buried pipe is
It depends on the condition of the buried pipe.
【００１１】即ち、埋設管の壁の一部が腐食等により減
肉していると、ここを経て外部に漏洩する交流磁界が増
えるので、この範囲の受信レベルが高くなる。従って受
信レベルが高くなる範囲の存在により減肉部分が検知さ
れ、これと共に、地上への投影位置としての位置を検知
することができる。That is, when a part of the wall of the buried pipe is thinned due to corrosion or the like, the AC magnetic field leaking to the outside through the wall increases, so that the reception level in this range becomes high. Therefore, the presence of the range in which the reception level is high detects the thinned portion, and at the same time, the position as the projection position on the ground can be detected.
【００１２】一方、継手部のように埋設管の壁の厚さが
等価的に厚くなっている部分では、ここを経て漏洩する
交流磁界が減少するので、この範囲の受信レベルが低く
なる。従って受信レベルが低くなる範囲の存在により継
手部が検知され、これと共に、地上への投影位置として
の位置を検知することができる。On the other hand, in the portion where the thickness of the wall of the buried pipe is equivalently thick like the joint portion, the AC magnetic field leaking through this portion decreases, so the reception level in this range becomes low. Therefore, the joint portion is detected by the existence of the range in which the reception level is low, and the position as the projection position on the ground can be detected together with this.
【００１３】以上説明したように本発明では、受信装置
は、それに内蔵した受信コイルと送信コイルの相対位置
関係を一定とするようにピグの移動に追随して移動させ
ることが必要である。As described above, in the present invention, the receiving device needs to be moved following the movement of the pig so that the relative positional relationship between the receiving coil and the transmitting coil incorporated therein is constant.
【００１４】このような移動は、まず受信装置に、左右
対称に配設した第１の一対の受信コイルと、この第１の
一対の受信コイルの対称軸上の前後に設けた第２の一対
の受信コイルとから成り、これらの受信コイルの巻軸を
上記対称軸と平行に構成した位置調整手段を設けること
によって達成される。このような位置調整手段を設ける
ことにより、地上への投影位置が未知の埋設管であって
も、受信装置を、それに内蔵した受信コイルと送信コイ
ルの相対位置関係を一定とするようにピグの移動に追随
して移動させることができる。In such a movement, first, in the receiving device, a first pair of receiving coils symmetrically arranged and a second pair of receiving coils provided on the front and rear on the axis of symmetry of the first pair of receiving coils. This is achieved by providing position adjusting means which is composed of the receiving coils of No. 1 and the winding axes of these receiving coils are parallel to the above-mentioned axis of symmetry. By providing such a position adjusting means, even if the projection position on the ground is an unknown buried pipe, the receiving device is configured so that the relative positional relationship between the receiving coil and the transmitting coil is fixed. It can be moved following the movement.
【００１５】一方、敷設時の図面やパイプロケーターに
より、地上への投影位置がわかる埋設管に関しては、送
信コイルを内蔵したピグを、移動距離を測定可能な駆動
手段により移動させる構成とすることにより、受信装置
を、それに内蔵した受信コイルと送信コイルの相対位置
関係を一定とするようにピグの移動に追随して移動させ
ることができる。On the other hand, for a buried pipe whose projected position on the ground can be determined by a drawing or a pipe locator at the time of laying, a pig having a transmitter coil is moved by a driving means capable of measuring a moving distance. The receiver can be moved following the movement of the pig so that the relative positional relationship between the receiver coil and the transmitter coil built in the receiver is constant.
【００１６】[0016]
【実施例】次に本発明の実施例を図について説明する。
図１は本発明方法の基本概念を表した説明図である。符
号１はピグ、２はこのピグ１に内臓した送信コイル、３
は発振器である。ピグ１は、後述するような適宜の方法
で埋設管４内を移動させる構成としている。一方、符号
５は受信装置であり、この受信装置５には送信コイル２
からの交流磁界を受信する受信コイル６と、その受信レ
ベルの測定手段７とを設けている。送信コイル２から発
生させる交流磁界の周波数は、例えばピグロケーターに
於いて通常使用されている周波数の範囲から適宜に選定
することができる。例えば強磁性体の埋設管の場合には
10〜100Hzの範囲から選定することができ、またステン
レス管、ポリエチレン管等の場合には、それ以上で100k
Hz程度までの範囲から適宜選定することができる。Embodiments of the present invention will now be described with reference to the drawings.
FIG. 1 is an explanatory view showing the basic concept of the method of the present invention. Reference numeral 1 is a pig, 2 is a transmitter coil incorporated in the pig 1, 3
Is an oscillator. The pig 1 is configured to move inside the buried pipe 4 by an appropriate method described later. On the other hand, reference numeral 5 is a receiving device, and the receiving device 5 includes a transmitting coil 2
A receiving coil 6 for receiving an AC magnetic field from the device and measuring means 7 for measuring the receiving level thereof are provided. The frequency of the AC magnetic field generated from the transmission coil 2 can be appropriately selected from the range of frequencies normally used in, for example, a piggator. For example, in the case of a buried tube of ferromagnetic material,
It can be selected from the range of 10 to 100 Hz, and in the case of stainless steel pipe, polyethylene pipe, etc., 100 k
It can be appropriately selected from the range up to about Hz.
【００１７】図２は本発明に適用する受信装置５の実施
例に於ける受信コイル６等の平面的配置を表したもの
で、この実施例では、上記受信コイル６に加え、左右対
称に配設した第１の一対の受信コイル８ａ，８ｂと、こ
の第１の一対の受信コイル８ａ，８ｂの対称軸ｓ上の前
後に設けた第２の一対の受信コイル９ａ，９ｂとを設
け、これらの受信コイル８ａ，８ｂ，９ａ，９ｂの巻軸
を上記対象軸ｓと平行に構成して位置調整手段を設けて
いる。この実施例では、受信コイル６は位置調整手段の
構成要素の受信コイル８ａ，８ｂ，９ａ，９ｂとは別に
設けているが、図３の実施例では、受信コイル６は、位
置調整手段の構成要素である受信コイル９ａを兼用して
いる。尚、図２、図３に於いて、符号１０は上記測定手
段７と位置調整手段を総合的に制御する制御手段であ
る。FIG. 2 shows a planar arrangement of the receiving coil 6 and the like in the embodiment of the receiving apparatus 5 applied to the present invention. In this embodiment, in addition to the receiving coil 6 described above, the receiver coil 6 is symmetrically arranged. The first pair of receiving coils 8a, 8b provided and the second pair of receiving coils 9a, 9b provided before and after the symmetry axis s of the first pair of receiving coils 8a, 8b are provided. The receiving coils 8a, 8b, 9a, 9b are constructed such that the winding axes of the receiving coils 8a, 8b, 9a and 9b are parallel to the target axis s and the position adjusting means is provided. In this embodiment, the receiving coil 6 is provided separately from the receiving coils 8a, 8b, 9a, 9b which are the components of the position adjusting means, but in the embodiment of FIG. The receiving coil 9a, which is an element, is also used. In FIG. 2 and FIG. 3, reference numeral 10 is a control means for comprehensively controlling the measuring means 7 and the position adjusting means.
【００１８】以上の受信装置５を適用する場合には、検
知の対象となる埋設管４は、地上への投影位置が分から
ないものであっても良く、またピグ１の埋設管４内移動
のための駆動方法も、従来のピグロケーターに於いて利
用されている駆動方法、例えばケーブルによる牽引また
は押し込みによる駆動、自走ロボット等の管内自走機構
による駆動、埋設管４内を流れる気体の圧力による駆動
等を利用することができる。When the above receiving device 5 is applied, the buried pipe 4 to be detected may be one whose projection position on the ground is unknown, and the movement of the pig 1 inside the buried pipe 4 may be unknown. The driving method for this purpose is also the driving method used in the conventional piggator, for example, driving by pulling or pushing in by a cable, driving by a self-propelled mechanism such as a self-propelled robot, pressure of gas flowing in the buried pipe 4. It is possible to use the driving by etc.
【００１９】このようにして内蔵した送信コイル２から
交流磁界を発生させながらピグ１を埋設管４内に移動さ
せ、そしてピグ１の移動に追随して受信装置５を移動さ
せると共に、受信コイル６により、送信コイル２からの
交流磁界の受信レベルを連続的に測定して、記録紙や磁
気的記録媒体等の適宜の記録媒体に記録する。In this way, the pig 1 is moved into the buried pipe 4 while generating an alternating magnetic field from the built-in transmitter coil 2, and the receiver 5 is moved following the movement of the pig 1, and the receiver coil 6 is also moved. Thus, the reception level of the AC magnetic field from the transmission coil 2 is continuously measured and recorded on an appropriate recording medium such as recording paper or a magnetic recording medium.
【００２０】この際、左右一対の受信コイル８ａ，８ｂ
の受信レベルが等しくなるように受信装置５を左右に移
動すると、受信レベルが等しくなった時点では、これら
の受信コイル８ａ，８ｂの対象軸ｓが送信コイル２の巻
軸の直上に位置するように調整され、また前後一対の受
信コイル９ａ，９ｂの受信レベルが等しくなるように受
信装置５を前後に移動すると、受信レベルが等しくなっ
た時点では、これらの中央位置に送信コイル２が位置す
るように調整される。このようにして、夫々の対毎に受
信レベルを等しくするように受信装置５を移動させるこ
とにより、受信コイル６と送信コイル２との相対位置関
係が一定となる状態で受信装置５をピグ１の移動に追随
して移動させることができる。At this time, a pair of left and right receiving coils 8a, 8b
When the receiving device 5 is moved to the left and right so that the receiving levels become equal, the target axes s of these receiving coils 8a and 8b are positioned immediately above the winding axis of the transmitting coil 2 when the receiving levels become equal. When the receiving device 5 is moved back and forth so that the reception levels of the front and rear reception coils 9a and 9b become equal to each other, when the reception levels become equal, the transmission coil 2 is located at the center position of these. Is adjusted. In this way, by moving the receiving device 5 so that the reception level becomes equal for each pair, the receiving device 5 is moved to the pig 1 while the relative positional relationship between the receiving coil 6 and the transmitting coil 2 becomes constant. It can be moved following the movement of.
【００２１】このように受信コイル６と送信コイル２の
相対位置関係が一定とすると、送信コイル２から埋設管
４の壁を経て漏洩し、受信コイル６により受信される交
流磁界の受信レベルは、埋設管４の状態に左右される。Assuming that the relative positional relationship between the receiving coil 6 and the transmitting coil 2 is constant as described above, the receiving level of the AC magnetic field leaked from the transmitting coil 2 through the wall of the buried pipe 4 and received by the receiving coil 6 is It depends on the condition of the buried pipe 4.
【００２２】例えば、図４に示すように埋設管４の壁に
腐食による減肉部分１１があると、この減肉部分１１を
経て送信コイル２から埋設管４の外部に漏洩する交流磁
界が増えるので、この減肉部分１１に対応する範囲の受
信レベルが高くなる。また、図５に示すようにピグ１が
継手部１２に至ると、この部分では埋設管４の壁の厚さ
が等価的に厚くなっているので、ここを経て漏洩する交
流磁界が減少する。このため継手部１２に対応する範囲
の受信レベルが低くなる。For example, as shown in FIG. 4, when the wall of the buried pipe 4 has a thinned portion 11 due to corrosion, an AC magnetic field leaking from the transmission coil 2 to the outside of the buried pipe 4 via the thinned portion 11 increases. Therefore, the reception level in the range corresponding to the thinned portion 11 becomes high. Further, as shown in FIG. 5, when the pig 1 reaches the joint portion 12, the wall of the buried pipe 4 is equivalently thicker in this portion, so that the AC magnetic field leaking therethrough is reduced. Therefore, the reception level in the range corresponding to the joint portion 12 becomes low.
【００２３】そこで受信コイル６を介しての受信レベル
の変化を時々刻々と監視したり、または記録されたデー
タを解析することにより受信レベルが変化している範囲
の有無を観測する。そして、受信レベルが高くなる範囲
が存在した場合には減肉部分１１、受信レベルが低くな
る範囲が存在した場合には継手部１２を、それらの位
置、即ちそれらの地上への投影位置としての位置を検知
することができる。Therefore, the presence or absence of the range in which the reception level is changing is observed by monitoring the change in the reception level via the receiving coil 6 every moment, or by analyzing the recorded data. Then, when there is a range where the reception level is high, the thinned portion 11 and when there is a range where the reception level is low, the joint portion 12 is set as their position, that is, their projected position on the ground. The position can be detected.
【００２４】尚、埋設管４が傾斜している場合には、傾
斜に応じて受信レベルも変化していくのであるが、この
変化は殆ど単調に増加するか、減少するかであって、あ
る範囲内の変化として現れることがないので上記検知対
象との区別は容易である。When the buried pipe 4 is tilted, the reception level also changes according to the tilt, but this change is almost monotonic increase or decrease. Since it does not appear as a change within the range, it can be easily distinguished from the detection target.
【００２５】このように図２または図３に示す実施例の
受信装置５を用いた場合には、検知の対象となる埋設管
４が、地上への投影位置が分からない場合であっても、
位置調整手段により自動的に受信コイル６と送信コイル
２の相対位置関係を一定とするようにピグ１の移動に追
随して移動させることができ、こうして上述した減肉部
分１１や継手部１２の検知を行うことができる。As described above, when the receiving device 5 of the embodiment shown in FIG. 2 or 3 is used, even if the embedded pipe 4 to be detected does not know the projected position on the ground,
The position adjusting means can automatically move the pig 1 so as to keep the relative positional relationship between the receiving coil 6 and the transmitting coil 2 constant, and thus the thinning portion 11 and the joint portion 12 described above can be moved. Detection can be performed.
【００２６】一方、埋設管敷設時の図面やパイプロケー
ター等により、地上への投影位置がわかる埋設管４に関
しては、送信コイル２を内蔵したピグ１を、移動距離を
測定可能な駆動手段により移動させる構成とする。この
ように埋設管４の地上への投影位置とピグ１の移動距離
が分かれば、ピグ１の現在位置を知ることができ、従っ
て受信装置５を、それに内蔵した受信コイル６と送信コ
イル２の相対位置関係を一定とするようにピグ１の移動
に追随して移動させることができる。On the other hand, with respect to the buried pipe 4 whose projection position on the ground can be known from the drawing when laying the buried pipe and the pipe locator, the pig 1 having the transmitter coil 2 is moved by the driving means capable of measuring the moving distance. Let it be configured to. If the projection position of the buried pipe 4 on the ground and the moving distance of the pig 1 are known in this way, the current position of the pig 1 can be known, and therefore the receiving device 5 is provided with the receiving coil 6 and the transmitting coil 2 incorporated therein. It can be moved following the movement of the pig 1 so that the relative positional relationship becomes constant.
【００２７】ピグ１の移動距離を測定可能な駆動手段と
しては、上述したようにピグロケーターに於ける駆動手
段として従来から利用されている手段を利用することが
できる。即ち、ケーブルによる駆動の場合には、ケーブ
ルの送り距離を回転距離計等で測定してピグの移動距離
を測定することができるし、ロボット自走車等の管内自
走機構の場合には、それ自体に移動距離測定機構を設け
ることにより測定することができる。またピグ１に埋設
管４の気体の圧力を受ける部材を設けて、気体の圧力に
よりピグ１を駆動する場合には、埋設管内のガス流量に
対応するピグの移動速度を積算することにより移動距離
を測定することができる。As the driving means capable of measuring the moving distance of the pig 1, it is possible to use the means which has been conventionally used as the driving means in the piggylocator as described above. That is, in the case of driving with a cable, the traveling distance of the pig can be measured by measuring the feed distance of the cable with a tachometer, and in the case of a self-propelled mechanism in a pipe such as a robot self-driving vehicle, It can be measured by providing a moving distance measuring mechanism on its own. In addition, when the pig 1 is provided with a member for receiving the gas pressure of the buried pipe 4 and the pig 1 is driven by the gas pressure, the moving distance of the pig corresponding to the gas flow rate in the buried pipe is integrated to move the moving distance. Can be measured.
【００２８】[0028]
【発明の効果】本発明は以上の通りであるので、埋設管
に於ける腐食減肉等の重大欠陥や、継手部等の対象個所
の検知を簡単な装置構成で行うことができるという効果
がある。Since the present invention is as described above, it is possible to detect a serious defect such as corrosion wall thinning in a buried pipe and a target portion such as a joint portion with a simple device configuration. is there.
【図１】本発明の基本概念を表した説明図である。FIG. 1 is an explanatory diagram showing the basic concept of the present invention.
【図２】本発明に適用する受信装置の実施例に於ける受
信コイル等の平面的配置を表した説明図である。FIG. 2 is an explanatory diagram showing a planar arrangement of receiving coils and the like in an embodiment of a receiving apparatus applied to the present invention.
【図３】本発明に適用する受信装置の他の実施例に於け
る受信コイル等の平面的配置を、本発明の動作説明と共
に表した説明図である。FIG. 3 is an explanatory view showing a planar arrangement of receiving coils and the like in another embodiment of the receiving apparatus applied to the invention together with an explanation of the operation of the invention.
【図４】本発明により検知する埋設管の重大欠陥の一例
及びそれによる受信レベルの変化を表した説明図であ
る。FIG. 4 is an explanatory diagram showing an example of a serious defect of a buried pipe detected by the present invention and a change in reception level due to the serious defect.
【図５】本発明により検知する埋設管の継手部の一例及
びそれによる受信レベルの変化を表した説明図である。FIG. 5 is an explanatory view showing an example of a joint portion of a buried pipe detected by the present invention and a change in reception level due to the joint portion.
１ ピグ ２ 送信コイル ３ 発振器 ４ 埋設管 ５ 受信装置 ６ 受信コイル ７ 測定手段 ８ａ，８ｂ 受信コイル ９ａ，９ｂ 受信コイル １０ 制御手段 １１ 減肉部分 １２ 継手部 1 Pig 2 Transmitting coil 3 Oscillator 4 Buried pipe 5 Receiving device 6 Receiving coil 7 Measuring means 8a, 8b Receiving coil 9a, 9b Receiving coil 10 Control means 11 Thinning portion 12 Joint part
Claims (7)
コイルから交流磁界を発生させるピグと、送信コイルか
らの交流磁界を受信する受信コイルを設けた受信装置と
を使用し、受信コイルと送信コイルの相対位置関係を一
定とするように受信装置をピグの移動に追随して移動さ
せながら、受信コイルにより送信コイルからの交流磁界
の受信レベルを連続的に測定し、受信レベルが変化した
範囲により対象個所の存在及び位置を検知することを特
徴とする埋設管に於ける対象個所の検知方法1. A receiving coil and a transmitting coil using a pig for generating an alternating magnetic field from a built-in transmitting coil while moving inside a buried pipe and a receiving device provided with a receiving coil for receiving the alternating magnetic field from the transmitting coil. While moving the receiving device following the movement of the pig so that the relative positional relationship of is constant, the receiving coil continuously measures the receiving level of the AC magnetic field from the transmitting coil, and the receiving level changes depending on the range. A method for detecting a target point in a buried pipe, characterized by detecting the presence and position of the target point
送信コイルの相対位置関係を一定とするように受信装置
をピグの移動に追随して移動させるために、受信装置に
は、左右対称に配設した第１の一対の受信コイルと、こ
の第１の一対の受信コイルの対称軸上の前後に設けた第
２の一対の受信コイルとから成り、これらの受信コイル
の巻軸を上記対象軸と平行に構成した位置調整手段を設
けたことを特徴とする埋設管に於ける対象個所の検知方
法2. The method according to claim 1, wherein in order to move the receiver device following the movement of the pig so that the relative positional relationship between the receiver coil and the transmitter coil is constant, the receiver device is provided with The first pair of receiving coils symmetrically arranged and the second pair of receiving coils provided on the front and rear on the axis of symmetry of the first pair of receiving coils. A method for detecting a target point in an embedded pipe, characterized by comprising position adjusting means configured parallel to the target axis.
いずれかを受信レベル測定に兼用する構成としたことを
特徴とする埋設管に於ける対象個所の検知方法3. The method according to claim 2, wherein one of the receiving coils is also used for measuring the receiving level, and the method detects the target portion in the buried pipe.
は地上への投影位置が既知なものとすると共に、受信コ
イルと送信コイルの相対位置関係を一定とするように受
信装置をピグの移動に追随して移動させるために、ピグ
は移動距離を測定可能な駆動手段により移動させる構成
としたことを特徴とする埋設管に於ける対象個所の検知
方法4. The method according to claim 1, wherein the target buried pipe has a known projection position on the ground, and the receiving device is arranged so that the relative positional relationship between the receiving coil and the transmitting coil is constant. In order to move the pig following the movement of the pig, the pig is moved by a driving means capable of measuring the movement distance, and a method for detecting a target portion in the buried pipe is characterized.
動距離を測定可能なケーブルとしたことを特徴とする埋
設管に於ける対象個所の検知方法5. The method according to claim 4, wherein the drive means is a cable capable of measuring a moving distance, and the target location in the buried pipe is detected.
動距離が測定可能な管内自走機構としたことを特徴とす
る埋設管に於ける対象個所の検知方法6. The method for detecting a target portion in a buried pipe according to claim 4, wherein the driving means is a self-propelled mechanism in the pipe capable of measuring a moving distance.
グに埋設管内の気体の圧力を受ける部材を設けて構成
し、埋設管内のガス流量に対応するピグの移動速度を積
算して移動距離を測定することを特徴とする埋設管に於
ける対象個所の検知方法7. The method according to claim 4, wherein the driving means is configured by providing a member for receiving the pressure of the gas in the buried pipe in the pig, and integrating the moving speed of the pig corresponding to the gas flow rate in the buried pipe. A method for detecting a target point in a buried pipe characterized by measuring a moving distance
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26127592A JP3119321B2 (en) | 1992-09-30 | 1992-09-30 | Detection method of target points in buried pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26127592A JP3119321B2 (en) | 1992-09-30 | 1992-09-30 | Detection method of target points in buried pipes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06109862A true JPH06109862A (en) | 1994-04-22 |
| JP3119321B2 JP3119321B2 (en) | 2000-12-18 |
Family
ID=17359561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26127592A Expired - Fee Related JP3119321B2 (en) | 1992-09-30 | 1992-09-30 | Detection method of target points in buried pipes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3119321B2 (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08166316A (en) * | 1994-12-16 | 1996-06-25 | Tokyo Gas Co Ltd | Pipe inspection apparatus |
| JPH11101774A (en) * | 1997-09-26 | 1999-04-13 | Tsutomu Hoshimiya | Apparatus for inspecting and evaluating surface flaw of conductor |
| JP2000088571A (en) * | 1998-07-15 | 2000-03-31 | Osaka Gas Co Ltd | Detecting method for position of moving body at inside of pipe |
| JP2001235089A (en) * | 2000-02-21 | 2001-08-31 | Tokyo Gas Co Ltd | Pig locator and method of chasing pig |
| JP2002055087A (en) * | 2000-08-11 | 2002-02-20 | Non-Destructive Inspection Co Ltd | Piping inspecting method |
| JP2003348774A (en) * | 2002-05-23 | 2003-12-05 | Tm:Kk | Non-invasive charging system for artificial organ, power storage apparatus using the system, and power feeding apparatus |
| US6748340B2 (en) | 2002-09-20 | 2004-06-08 | Ntt Infrastructure Network Corporation | Cable position information management system, facility information management system, cable core wire management system, and methods and programs thereof |
| JP2008275395A (en) * | 2007-04-26 | 2008-11-13 | Asahi Kasei Electronics Co Ltd | Position attitude detection system, its detection method, and position attitude detection device |
| CN104297596A (en) * | 2014-10-17 | 2015-01-21 | 中国石油天然气股份有限公司 | Magnetic field transmitter signal strength detecting device for tracking and positioning tube cleaner |
| JP2018044555A (en) * | 2016-09-12 | 2018-03-22 | 株式会社大林組 | Transfer device and position specification method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08166316A (en) * | 1994-12-16 | 1996-06-25 | Tokyo Gas Co Ltd | Pipe inspection apparatus |
| JPH11101774A (en) * | 1997-09-26 | 1999-04-13 | Tsutomu Hoshimiya | Apparatus for inspecting and evaluating surface flaw of conductor |
| JP2000088571A (en) * | 1998-07-15 | 2000-03-31 | Osaka Gas Co Ltd | Detecting method for position of moving body at inside of pipe |
| JP2001235089A (en) * | 2000-02-21 | 2001-08-31 | Tokyo Gas Co Ltd | Pig locator and method of chasing pig |
| JP2002055087A (en) * | 2000-08-11 | 2002-02-20 | Non-Destructive Inspection Co Ltd | Piping inspecting method |
| JP2003348774A (en) * | 2002-05-23 | 2003-12-05 | Tm:Kk | Non-invasive charging system for artificial organ, power storage apparatus using the system, and power feeding apparatus |
| US6748340B2 (en) | 2002-09-20 | 2004-06-08 | Ntt Infrastructure Network Corporation | Cable position information management system, facility information management system, cable core wire management system, and methods and programs thereof |
| JP2008275395A (en) * | 2007-04-26 | 2008-11-13 | Asahi Kasei Electronics Co Ltd | Position attitude detection system, its detection method, and position attitude detection device |
| CN104297596A (en) * | 2014-10-17 | 2015-01-21 | 中国石油天然气股份有限公司 | Magnetic field transmitter signal strength detecting device for tracking and positioning tube cleaner |
| JP2018044555A (en) * | 2016-09-12 | 2018-03-22 | 株式会社大林組 | Transfer device and position specification method |
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| Publication number | Publication date |
|---|---|
| JP3119321B2 (en) | 2000-12-18 |
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