JPH08261708A - Method and device for detecting position of magnetic field-generating body, and method for detecting underground object - Google Patents

Method and device for detecting position of magnetic field-generating body, and method for detecting underground object

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Publication number
JPH08261708A
JPH08261708A JP6302395A JP6302395A JPH08261708A JP H08261708 A JPH08261708 A JP H08261708A JP 6302395 A JP6302395 A JP 6302395A JP 6302395 A JP6302395 A JP 6302395A JP H08261708 A JPH08261708 A JP H08261708A
Authority
JP
Japan
Prior art keywords
magnetic field
detection
magnetic
plane
detecting
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.)
Pending
Application number
JP6302395A
Other languages
Japanese (ja)
Inventor
Koichi Kimura
宏一 木村
Takeetsu Shibano
健悦 柴野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kidoh Construction Co Ltd
Original Assignee
Kidoh Construction Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Kidoh Construction Co Ltd filed Critical Kidoh Construction Co Ltd
Priority to JP6302395A priority Critical patent/JPH08261708A/en
Publication of JPH08261708A publication Critical patent/JPH08261708A/en
Pending legal-status Critical Current

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  • Geophysics And Detection Of Objects (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

PURPOSE: To accurately and simply detect a magnetic field-generating body regardless of the presence of a magnetic obstacle by detecting the center direction of the magnetic field, obtaining a cross point, judging the center axis penetration point of the magnetic field, and judging the presence of the magnetic generating body. CONSTITUTION: The directions of magnetic field vectors Va, Vb, and Vd match at a center penetration point PO. It can be estimated that the magnetic field vectors are not affected by the turbulence of magnetic field and only a remaining magnetic field vector Vc is affected by the turbulence of the magnetic field. Even if only a detector 10c of center direction of the magnetic field is affected by a magnetic obstacle, detectors 10a, 10b, and 10d in the center direction of the magnetic field in the remaining three dimensions are not affected by the magnetic obstacle, thus accurately indicating the center direction of the magnetic field. It is judged that a magnetic generating body (for example, an advancing machine) exists on a line extended in a direction for crossing a plane to be measured, namely a paper surface, from a center axis penetration point Po thus obtained.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は、磁界発生***置検出方
法および装置ならびに地下物体検出方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field generator position detecting method and apparatus and an underground object detecting method.

【０００２】[0002]

【従来の技術】地下にトンネルを掘ったり下水管やガス
管などを埋設施工する方法として推進工法が知られてい
る。推進工法では、地盤に掘削された立坑から掘進機で
水平方向にトンネルを掘削し、掘進機をトンネル内に推
進させながら掘進機の後方に下水管などの埋設管を連結
して掘進機とともに推進させて埋設施工する。この推進
工法では、地盤を開削しないので、地表面の交通や利用
を阻害せずに地下に埋設管を施工することができ、施工
の作業能率も優れているという利点がある。2. Description of the Related Art A propulsion method is known as a method of digging a tunnel underground or burying a sewer pipe or a gas pipe. In the propulsion method, a tunnel is excavated horizontally from a vertical shaft excavated in the ground with a machine, and while the machine is propelled into the tunnel, a buried pipe such as a sewer pipe is connected behind the machine and propelled with the machine. Let it be buried. In this propulsion method, since the ground is not cut, the buried pipe can be constructed underground without hindering traffic and use on the ground surface, and there is an advantage that the work efficiency of the construction is excellent.

【０００３】推進工法では、埋設管を正確な経路に沿っ
て埋設していくために、地下にある掘進機の位置を正確
に知る必要がある。そのため、掘進機にコイルなどの磁
界発生器を備え、この磁界発生器から発生する磁界を地
上に配置された磁気測定装置で測定して、磁界発生器の
位置すなわち掘進機の位置を検出する方法が提案されて
いる。In the propulsion method, it is necessary to accurately know the position of the excavator under the ground in order to bury the buried pipe along an accurate path. Therefore, the excavator is equipped with a magnetic field generator such as a coil, and the magnetic field generated from the magnetic field generator is measured by a magnetic measurement device placed on the ground to detect the position of the magnetic field generator, that is, the position of the excavator. Is proposed.

【０００４】例えば、地下の磁界発生器から鉛直方向に
磁界を発生させておくと、地上では磁界の中心軸が地表
を貫通する地点で磁束の方向が鉛直方向になり磁束密度
すなわち磁界の強さが最大になる。磁気測定装置を地上
で走査して、磁界の最も強い地点を探せば、その真下に
磁界発生器すなわち掘進機が存在することが判る。この
ような用途に利用される磁気測定装置としては、磁界中
に置かれたコイルに発生する起電力を測定する装置があ
る。コイルに発生する起電力は磁界の強さとその変化の
度合に比例するので、起電力が最も大きくなる地点を探
すことで、掘進機の位置を検出することができる。For example, when a magnetic field is generated in the vertical direction from an underground magnetic field generator, the direction of the magnetic flux becomes the vertical direction at the point where the central axis of the magnetic field penetrates the ground surface on the ground, and the magnetic flux density, that is, the strength of the magnetic field. Is the maximum. Scanning the magnetometer on the ground and looking for the strongest magnetic field reveals that there is a magnetic field generator or excavator beneath it. As a magnetic measurement device used for such an application, there is a device that measures an electromotive force generated in a coil placed in a magnetic field. Since the electromotive force generated in the coil is proportional to the strength of the magnetic field and the degree of its change, the position of the excavator can be detected by searching for the point where the electromotive force is the largest.

【０００５】[0005]

【発明が解決しようとする課題】前記のように、地上に
おける磁界の強さを測定して、磁界の強さが最大になる
地点の地下に磁界発生器が存在すると判断する方法で
は、磁界発生器と地表の間に、磁界を乱すような磁性体
からなる埋設物すなわち磁気障害物が存在すると、磁界
発生器の位置を正確に知ることができないという問題が
ある。磁気障害物によって磁界発生器の磁界が乱される
と、磁界の方向が曲げられてしまい、磁界発生機の真上
でも磁界が鉛直方向を向かず磁界の強さも最大にはなら
ない。また、磁界発生器の真上ではないのに磁界が鉛直
方向を向いたり磁界の強さが最大になる地点が生じてし
まう。As described above, in the method of measuring the strength of the magnetic field on the ground and determining that the magnetic field generator exists below the point where the strength of the magnetic field is maximum, the magnetic field generation is not performed. If there is an embedded object made of a magnetic material that disturbs the magnetic field, that is, a magnetic obstacle, between the vessel and the surface of the earth, there is a problem that the position of the magnetic field generator cannot be accurately known. When the magnetic field of the magnetic field generator is disturbed by the magnetic obstacle, the direction of the magnetic field is bent, and the magnetic field does not face the vertical direction even directly above the magnetic field generator, and the strength of the magnetic field does not become maximum. In addition, there is a point where the magnetic field is oriented vertically but is not directly above the magnetic field generator or where the strength of the magnetic field is maximum.

【０００６】前記した推進工法を実施する地盤には、電
気、ガス、上下水道などの配管や配線が埋設されてお
り、これらの配管や配線には磁性体材料が使われてい
て、磁界を乱す磁気障害物となる。地下に埋設された各
種の金属構造物も同様の磁気障害物となる可能性があ
る。なお、磁界発生器などの磁界発生体を検出する際
に、周囲に存在する磁気障害物で磁界が乱されて磁界発
生体の位置が正確に検出できないという問題が生じるの
は、前記した推進工法における掘進機の位置検出に限ら
ず、磁気測量や非破壊検査技術分野など様々な技術分野
でも同様に問題となる。In the ground for carrying out the above-mentioned propulsion method, pipes and wiring for electricity, gas, water and sewage, etc. are buried, and a magnetic material is used for these pipes and wiring to disturb the magnetic field. It becomes a magnetic obstacle. Various metal structures buried underground may also become similar magnetic obstacles. When detecting a magnetic field generator such as a magnetic field generator, the problem that the magnetic field is disturbed by surrounding magnetic obstacles and the position of the magnetic field generator cannot be accurately detected occurs. Not only the position detection of the excavator in the above, but also various technical fields such as magnetic surveying and nondestructive inspection technical fields are similarly problematic.

【０００７】本発明の目的は、磁界発生体の磁界を乱す
磁気障害物があっても、磁界発生体を正確かつ簡単に検
出できるようにすることにある。また、推進工法におけ
る掘進機などの地下物体を正確かつ簡単に検出できるよ
うにすることにある。An object of the present invention is to make it possible to detect a magnetic field generator accurately and easily even if there is a magnetic obstacle that disturbs the magnetic field of the magnetic field generator. Another object is to make it possible to accurately and easily detect an underground object such as an excavator in the propulsion method.

【０００８】[0008]

【課題を解決するための手段】本発明の磁界発生***置
検出方法は、以下の工程を備えている。磁界発生体の磁
界の中心軸と直交する被測定平面上で、被測定平面に対
する磁界の中心軸の貫通点を囲む４地点以上において磁
界の中心方向を検出する工程。各地点における磁界の中
心方向同士の交点を求める工程。各交点のうち最も多数
の交点が集中する位置を磁界の中心軸貫通点であると判
定する工程。磁界の中心軸貫通点から被測定平面と直交
する方向に磁界発生体が存在すると判断する工程。The magnetic field generator position detecting method of the present invention comprises the following steps. A step of detecting the central direction of the magnetic field at four or more points surrounding a penetration point of the central axis of the magnetic field with respect to the measured plane on the measured plane orthogonal to the central axis of the magnetic field of the magnetic field generator. The process of finding the intersection of the center directions of the magnetic fields at each point. A step of determining the position where the largest number of intersections among the intersections are concentrated as the central axis penetration point of the magnetic field. A step of determining that the magnetic field generator exists in the direction orthogonal to the measured plane from the penetration point of the central axis of the magnetic field.

【０００９】なお、前記磁界の中心方向を検出する工程
が、以下の工程を含むことができる。検出平面上におけ
るその地点の磁界の中心方向を検出する磁界の中心方向
検出器が、検出平面上に設定された多角形の各頂点位置
ごとに合計４個以上配置された磁界発生***置検出装置
を準備する工程。被測定平面上に、検出平面が被測定平
面と一致し、各磁界の中心方向検出器が磁界の中心軸貫
通点を囲んで配置されるように磁界発生***置検出装置
を配置する工程。各磁界の中心方向検出器でそれぞれの
配置地点における磁界の中心方向を検出する工程。The step of detecting the central direction of the magnetic field may include the following steps. Magnetic field generator position detecting device in which a total of four or more magnetic field center direction detectors for detecting the center direction of the magnetic field at that point on the detection plane are arranged at each vertex position of the polygon set on the detection plane. The step of preparing. A step of arranging the magnetic field generator position detection device on the measured plane so that the detection plane coincides with the measured plane and the central direction detectors of the respective magnetic fields are arranged so as to surround the central axis penetration point of the magnetic field. The step of detecting the central direction of the magnetic field at each placement point with the central direction detector of each magnetic field.

【００１０】本発明の磁界発生***置検出装置は、上記
磁界発生***置検出方法に用いる装置であって、検出平
面上におけるその地点の磁界の中心方向を検出する磁界
の中心方向検出器が、前記検出平面上に設定された多角
形の各頂点位置ごとに合計４個以上配置される。なお、
前記磁界の中心方向検出器が、前記平面上で互いに直交
する方向にそれぞれの軸方向が配置されたＸＹ両方向の
検出コイル部と、ＸＹ検出コイル部の検出信号を比較し
て磁界の中心方向を検出する磁界の中心方向検出手段と
を備えることができる。The magnetic field generator position detecting apparatus of the present invention is an apparatus used in the magnetic field generator position detecting method, wherein a magnetic field center direction detector for detecting the center direction of the magnetic field at that point on the detection plane is A total of four or more are arranged for each vertex position of the polygon set on the detection plane. In addition,
The magnetic field center direction detector compares the detection signals of the XY detection coil units in which the respective axial directions are arranged in the directions orthogonal to each other on the plane and the detection signals of the XY detection coil unit, and determines the center direction of the magnetic field. And a means for detecting the central direction of the magnetic field to be detected.

【００１１】前記ＸＹ検出コイル部が、同軸上で前後に
間隔をあけて配置され電気的に接続された一対のコイル
を有し、一対のコイルの間でＸＹ検出コイル部が互いに
直交し、ＸＹ検出コイル部のコイル同士が間隔をあけて
配置されていることができる。本発明の地下物体検出方
法は、地下に配置された物体を地上で検出する方法であ
って、以下の工程を備えている。地下に物体とともに配
置された磁界発生器で鉛直方向に中心軸を有する磁界を
発生させる工程。前記の磁界発生***置検出方法を、被
測定平面を地上で地表面と平行な平面に設定して実行し
て磁界の中心軸貫通点を求める工程。磁界の中心軸貫通
点の真下の地下に前記物体が存在すると判断する工程。The XY detection coil section has a pair of coils which are coaxially arranged at anteroposterior intervals and electrically connected to each other, and the XY detection coil sections are orthogonal to each other between the pair of coils. The coils of the detection coil unit may be arranged at intervals. The underground object detection method of the present invention is a method for detecting an object placed underground, on the ground, and includes the following steps. A step of generating a magnetic field having a central axis in the vertical direction with a magnetic field generator that is placed underground with an object. A step of determining the magnetic field generator position detection method by setting the plane to be measured to be a plane parallel to the ground surface on the ground and determining the central axis penetration point of the magnetic field. A step of determining that the object exists underground just below the central axis penetration point of the magnetic field.

【００１２】なお、前記磁界発生器が、通電により交番
磁界を発生するコイルであることができる。The magnetic field generator may be a coil which generates an alternating magnetic field when energized.

【００１３】[0013]

【作用】磁界発生体による磁界は、磁界発生体の中心軸
すなわち磁界の中心軸を中心にして外側へとループ状に
拡がる閉回路を構成するように分布している。磁界の中
心軸と直交する平面上での磁界のベクトル成分は、平面
と磁界の中心軸との交点すなわち平面上での磁界の中心
軸貫通点を中心にして平面上を放射状に延びている。す
なわち、平面上での任意の地点でその地点における磁界
ベクトル成分すなわち磁界の方向を直線的に延長した線
上に磁界の中心軸貫通点が存在することになる。The magnetic field generated by the magnetic field generator is distributed so as to form a closed circuit that expands outward in a loop around the central axis of the magnetic field generator, that is, the central axis of the magnetic field. The vector component of the magnetic field on the plane orthogonal to the central axis of the magnetic field extends radially on the plane around the intersection of the plane and the central axis of the magnetic field, that is, the through point of the central axis of the magnetic field on the plane. That is, at any point on the plane, the magnetic field vector component at that point, that is, the point through the central axis of the magnetic field exists on a line obtained by linearly extending the direction of the magnetic field.

【００１４】したがって、被測定平面上の複数の地点
で、それぞれの地点における磁界の中心方向を検出すれ
ば、各磁界の中心方向の延長線が交差する地点に磁界の
中心軸貫通点が存在することになる。こうして検出され
た磁界の中心軸貫通点を被測定平面と直交する方向に延
長した先に磁界発生体が存在する。このようにして、磁
界発生体の位置が判る。Therefore, if the center direction of the magnetic field at each point is detected at a plurality of points on the plane to be measured, the magnetic field central axis penetrating point exists at the point where the extension lines in the center direction of the respective magnetic fields intersect. It will be. The magnetic field generator is present at the end of the central axis penetration point of the magnetic field detected in this way extended in the direction orthogonal to the plane to be measured. In this way, the position of the magnetic field generator can be known.

【００１５】但し、磁界内に磁性体などの磁界を乱す物
体すなわち磁気障害物が存在すると、その周辺では磁束
が曲げられてしまう。このような曲げられた磁束が通過
する地点で、その地点の磁界の中心方向を検出しても、
検出された磁界の中心方向の延長線上には磁界の中心軸
貫通点は存在せず、正確な磁界発生体の位置を検出する
ことができなくなる。However, if there is an object such as a magnetic material that disturbs the magnetic field, that is, a magnetic obstacle, the magnetic flux is bent around the magnetic field. At a point where such a bent magnetic flux passes, even if the center direction of the magnetic field at that point is detected,
Since there is no central axis penetrating point of the magnetic field on the extension line in the center direction of the detected magnetic field, it becomes impossible to accurately detect the position of the magnetic field generator.

【００１６】そこで、本発明では、磁界発生体の磁界の
中心軸と直交する被測定平面上で、被測定平面に対する
磁界の中心軸の貫通点を囲む４地点以上において磁界の
中心方向を検出する。磁界の中心軸貫通点の位置が正確
には判っていなくても、おおよその範囲が判っていれ
ば、その範囲の外側になる地点に磁界の中心方向の検出
地点を設定すればよい。Therefore, in the present invention, the central direction of the magnetic field is detected at four or more points surrounding the penetration point of the central axis of the magnetic field with respect to the measured plane on the measured plane orthogonal to the central axis of the magnetic field of the magnetic field generator. . Even if the position of the penetration point of the central axis of the magnetic field is not exactly known, if the approximate range is known, the detection point in the central direction of the magnetic field may be set at a point outside the range.

【００１７】前記したように、磁界内に磁気障害物がな
ければ、全ての交点は一致し、この交点が磁界の中心軸
貫通点となり、この磁界の中心軸貫通点を被測定平面と
直交する方向に延長した線上に磁界発生体が存在する。
しかし、磁気障害物があると、全ての交点が一致しなく
なる。この場合、各交点のうち最も多数の交点が集中す
る位置を磁界の中心軸貫通点であると判定する。As described above, if there are no magnetic obstacles in the magnetic field, all the intersections are coincident with each other, and the intersections become the central axis penetration points of the magnetic field, and the central axis penetration points of the magnetic field are orthogonal to the measured plane. A magnetic field generator exists on a line extending in the direction.
However, if there are magnetic obstacles, all intersections will not match. In this case, the position where the largest number of intersections among the intersections are concentrated is determined to be the center axis penetration point of the magnetic field.

【００１８】被測定平面上で磁界の中心軸貫通点を中心
にして放射方向に拡がる磁界のうち、磁気障害物によっ
て方向が曲げられるのは、磁気障害物が存在する方向の
磁界だけである。磁気障害物から離れた方向では磁気障
害物の影響は少なくなる。磁界の中心軸貫通点を中心に
して磁気障害物の存在位置とは反対側になる位置では磁
界の方向はほとんど曲げられない。Among the magnetic fields that spread in the radial direction around the center axis penetration point of the magnetic field on the plane to be measured, only the magnetic field in the direction in which the magnetic obstacle exists is bent by the magnetic obstacle. The influence of the magnetic obstacle is reduced in the direction away from the magnetic obstacle. The direction of the magnetic field is hardly bent at the position opposite to the position where the magnetic obstacle exists with the center axis penetration point of the magnetic field as the center.

【００１９】したがって、磁界の中心軸貫通点を囲む４
地点以上で磁界の中心方向を検出すれば、そのうち、誤
った磁界の中心方向を示すのは１地点あるいは少数地点
だけである。その他の多数の地点については正確な磁界
の中心方向が検出できる。多数の正確な磁界の中心方向
同士の交点は全て一致するから、各交点のうち最も多数
の交点が集中する位置を磁界の中心軸貫通点であると判
定すれば、磁気障害物による影響は無視できることにな
る。Therefore, 4 surrounding the central axis penetration point of the magnetic field
When the center direction of the magnetic field is detected at a point or more, only one or a few points show the wrong center direction of the magnetic field. At many other points, the exact direction of the magnetic field center can be detected. Since the intersections of many accurate magnetic field center directions all match, if the position where the largest number of intersections are concentrated is determined to be the magnetic field central axis penetration point, the effect of magnetic obstacles is ignored. You can do it.

【００２０】検出地点の多くで磁気障害物の影響を受け
たとしても、磁気障害物から離れた方向の検出地点ほど
受ける影響は少なく、検出された磁界の中心方向の誤差
も少なくなる。したがって、磁界の中心方向同士の交点
が完全に一致しなくても、多数の交点が狭い範囲に集中
する位置を磁界の中心軸貫通点であると判定すれば、実
用上は十分な精度で磁界の中心軸貫通点すなわち磁界発
生体の位置を検出することができる。Even if many of the detection points are affected by the magnetic obstacles, the detection points farther away from the magnetic obstacles are less affected, and the error in the center direction of the detected magnetic field is also reduced. Therefore, even if the intersections of the center directions of the magnetic field do not completely match, if the position where many intersections are concentrated in a narrow range is determined to be the center axis penetration point of the magnetic field, the magnetic field will be sufficiently accurate for practical use. It is possible to detect the central axis penetrating point of, that is, the position of the magnetic field generator.

【００２１】なお、磁界の中心方向を検出する工程で、
前記のような４個以上の磁界の中心方向検出器を備えた
磁界発生***置検出装置を用いれば、被測定平面上に各
磁界の中心方向検出器が磁界の中心軸貫通点を囲むよう
に磁界発生***置検出装置を配置して、各磁界の中心方
向検出器で磁界の中心方向を検出するという簡単な操作
だけで、磁界の中心軸貫通点すなわち磁界発生体の位置
を迅速かつ簡単に検出することができる。各検出地点毎
に磁界の中心方向検出器を移動させて順次検出を行う方
法に比べて手間と作業時間が省ける。各磁界の中心方向
検出器の位置および姿勢が正確に設定されるので、各検
出地点における検出誤差が生じ難く、正確な検出結果が
得られる。In the step of detecting the central direction of the magnetic field,
By using the magnetic field generator position detecting device provided with four or more magnetic field center direction detectors as described above, the center direction detectors of each magnetic field surround the central axis penetration point of the magnetic field on the plane to be measured. The position of the magnetic field generator position detector can be arranged and the central direction detector of each magnetic field can detect the central direction of the magnetic field. Can be detected. The labor and work time can be saved as compared with the method of sequentially detecting the magnetic field center direction detector by moving it at each detection point. Since the position and orientation of the center direction detector of each magnetic field are accurately set, a detection error is unlikely to occur at each detection point, and an accurate detection result can be obtained.

【００２２】本発明の磁界発生***置検出装置は、検出
平面上におけるその地点の磁界の中心方向を検出する磁
界の中心方向検出器が、前記検出平面上に設定された多
角形の各頂点位置ごとに合計４個以上配置されるので、
前記検出方法に適用することができ、前記した作用効果
が発揮できる。磁界の中心方向検出器が、前記のような
ＸＹ両方向の検出コイル部と磁界の中心方向検出手段を
備えていれば、簡単な構造でありながら、平面上におけ
る磁界の中心方向の検出を確実に行うことができる。In the magnetic field generator position detecting device of the present invention, a magnetic field center direction detector for detecting the center direction of the magnetic field at that point on the detection plane is provided at each vertex position of the polygon set on the detection plane. There will be 4 or more in total, so
It can be applied to the above-mentioned detection method, and the above-mentioned effects can be exhibited. If the detector for detecting the central direction of the magnetic field is provided with the above-described XY bidirectional detecting coil section and the detecting means for detecting the central direction of the magnetic field, the detection of the central direction of the magnetic field on the plane can be surely performed even though the structure is simple. It can be carried out.

【００２３】ＸＹ検出コイル部が、前記のような一対の
コイルを備えていれば、ＸＹ検出コイル部のコイルの配
置形状が全く同じになり、コイル同士が重なりあったり
干渉したりすることがないので、ＸＹ両方向の検出特性
が揃うことになり、磁界の中心方向の検出が正確に行え
る。本発明の地下物体検出方法は、前記した磁界発生体
位置検出方法を、地下に配置された物体を地上で検出す
るために適用する。磁界発生体として地下に配置された
物体に磁界発生器を備えておき、被測定平面を地上で地
表面と平行な平面に設定することで、検出された磁界の
中心軸貫通点の真下に前記物体が存在することが判る。
地下に目的の物体以外に磁界を乱す物体が存在していて
も、このような磁界を乱す物体の影響を受けることな
く、目的の物体の位置を正確に検出することができる。If the XY detection coil section is provided with a pair of coils as described above, the arrangement shapes of the coils of the XY detection coil section will be exactly the same, and the coils will not overlap or interfere with each other. Therefore, the detection characteristics in both the XY directions are aligned, and the detection of the center direction of the magnetic field can be performed accurately. The underground object detection method of the present invention applies the magnetic field generator position detection method described above to detect an object placed underground under the ground. An object placed underground as a magnetic field generator is equipped with a magnetic field generator, and by setting the plane to be measured to a plane parallel to the ground surface on the ground, the above-mentioned point is directly below the central axis penetration point of the detected magnetic field. It turns out that an object exists.
Even if there is an object that disturbs the magnetic field other than the target object in the underground, the position of the target object can be accurately detected without being affected by such an object that disturbs the magnetic field.

【００２４】なお、前記磁界発生器が、通電によりその
軸方向に磁界の中心軸を有する磁界を発生するコイルで
あれば、磁界発生器が簡単かつ小型化される。If the magnetic field generator is a coil that generates a magnetic field having the central axis of the magnetic field in the axial direction when energized, the magnetic field generator can be easily and miniaturized.

【００２５】[0025]

【実施例】図１に示す磁界発生***置検出装置は、４個
の磁界の中心方向検出器１０ａ、１０ｂ、１０ｃ、１０
ｄが正方形の頂点位置Ｓａ、Ｓｂ、Ｓｃ、Ｓｄごとに配
置されている。 〔磁界の中心方向検出器〕各磁界の中心方向検出器１０
ａ…は、磁界中に配置されたときに、それぞれの中心Ｓ
ａ…における磁界ベクトルＶａ、Ｖｂ、Ｖｃ、Ｖｄを検
出する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The magnetic field generator position detecting device shown in FIG. 1 is composed of four magnetic field center direction detectors 10a, 10b, 10c, 10
d is arranged at each vertex position Sa, Sb, Sc, Sd of the square. [Center direction detector of magnetic field] Center direction detector 10 of each magnetic field
a ... is the center S of each when placed in a magnetic field.
The magnetic field vectors Va, Vb, Vc, Vd at a ... Are detected.

【００２６】図２に示すように、磁界の中心方向検出器
１０は、立方体状をなす支持ブロック１１と、支持ブロ
ック１１の３軸方向それぞれに設けられた検出コイル部
２０ｘ、２０ｙ、２０ｚとを有する。支持ブロック１１
の各面には、円盤状のコイル支持環１２が張り出してい
る。図３に詳しく示すように、コイル支持環１２の外周
には凹溝状のコイル巻回溝１４を有する。コイル巻回溝
１４には、導線を多数巻回して構成されたコイル２２が
支持されている。コイル２２の外径はコイル支持環１２
の外径よりも小さく、支持ブロック１０の面よりも外に
はみ出ることはない。隣接する面のコイル２２…同士は
十分な間隔をあけて配置されている。As shown in FIG. 2, the magnetic field center direction detector 10 includes a support block 11 having a cubic shape, and detection coil portions 20x, 20y, 20z provided in the three axial directions of the support block 11, respectively. Have. Support block 11
A disk-shaped coil support ring 12 projects from each surface of the. As shown in detail in FIG. 3, a coil winding groove 14 having a concave groove shape is provided on the outer periphery of the coil support ring 12. A coil 22 formed by winding a large number of conductive wires is supported in the coil winding groove 14. The outer diameter of the coil 22 is the coil support ring 12
Is smaller than the outer diameter of the support block 10 and does not extend beyond the surface of the support block 10. The coils 22 on adjacent surfaces are arranged with a sufficient space therebetween.

【００２７】各検出コイル部２０ｘ…の中心軸は、ＸＹ
Ｚの互いに直交する３軸方向にそれぞれ沿って配置され
ている。また、各検出コイル部２０ｘ…の中心軸は、支
持ブロック１０の中心Ｃで３軸が直交する。支持ブロッ
ク１０の３軸方向それぞれの対向面に配置された一対の
コイル２２、２２は、その一端同士が導線２４で電気的
に接続されて、検出コイル部２０ｘ、２０ｙ、２０ｚを
構成している。各検出コイル部２０ｘ…の接続導線２４
…同士は交差したり異なる経路に配置されたりしてい
る。各コイル２２、２２の他端は、図示しない検出信号
の制御装置に接続される。検出信号の制御装置は、検出
コイル対２０ｘ…で発生する起電力などの検出信号を電
気的に処理して計器に表示したり記録したりする。ま
た、各検出コイル対２０ｘ…の検出信号を比較したり演
算処理したりする。制御装置の具体的な構造は、通常の
電気的測定装置と同様である。 〔磁界の中心方向検出器の動作〕図４(a) に示すよう
に、磁界の中心方向検出器１０の中心Ｃに磁界ベクトル
Ｖが作用する。The central axes of the detection coil portions 20x ...
They are arranged along the three axial directions of Z, which are orthogonal to each other. Further, the central axes of the respective detection coil portions 20x ... Are orthogonal to each other at the center C of the support block 10. The pair of coils 22, 22 arranged on the opposing surfaces of the support block 10 in the respective three axial directions are electrically connected to each other at one end by a conductor wire 24 to form detection coil portions 20x, 20y, 20z. . Connection wire 24 of each detection coil unit 20x ...
… They intersect or are placed on different routes. The other ends of the coils 22 and 22 are connected to a detection signal control device (not shown). The detection signal control device electrically processes a detection signal such as an electromotive force generated in the detection coil pair 20x, and displays or records it on an instrument. Further, the detection signals of the respective detection coil pairs 20x ... Are compared and arithmetic processing is performed. The specific structure of the control device is similar to that of a normal electrical measuring device. [Operation of Magnetic Field Center Direction Detector] As shown in FIG. 4A, the magnetic field vector V acts on the center C of the magnetic field center direction detector 10.

【００２８】図４(b) に示すように、検出コイル部２０
ｘ、２０ｙには、磁界ベクトルＶの各軸方向成分に対応
する起電力Ｅが発生する。図４の場合は、Ｘ軸方向より
もＹ軸方向に磁界ベクトルＶが傾いているので、Ｙ軸方
向の起電力が大きくなっている。逆に言うと、検出コイ
ル部２０ｘ、２０ｙに発生するＸＹ方向の起電力Ｅを検
出することによって、その地点ＣにおけるＸＹ平面上で
の磁界ベクトルＶの方向が判る。磁界ベクトルＶの方向
の延長方向が磁界の中心方向となる。As shown in FIG. 4B, the detection coil unit 20
An electromotive force E corresponding to each axial component of the magnetic field vector V is generated in x and 20y. In the case of FIG. 4, since the magnetic field vector V is tilted in the Y-axis direction rather than the X-axis direction, the electromotive force in the Y-axis direction is large. Conversely, by detecting the electromotive force E in the XY directions generated in the detection coil units 20x and 20y, the direction of the magnetic field vector V on the XY plane at the point C can be known. The extension direction of the direction of the magnetic field vector V is the central direction of the magnetic field.

【００２９】なお、検出コイル部２０ｚにも磁界ベクト
ルＶのＺ軸方向成分に対応するＺ軸方向の起電力Ｅが発
生するので、ＸＹＺ軸方向の起電力Ｅを合成すれば磁界
ベクトルＶの３次元方向も判るが、通常はＸＹ平面上で
の磁界ベクトルＶの方向を知るだけで十分である。上記
実施例の磁界の中心方向検出器１０では、ＸＹ方向の検
出コイル部２０ｘ、２０ｙで、それぞれ軸方向に前後に
分割配置されたコイル２２、２２を備えていて、前後の
コイル２２、２２をつなぐ接続導線２４の部分のみが互
いに交差しており、ＸＹ方向のコイル２２が同一構造で
あり互いに重なり合ったり干渉したりすることもないの
で、ＸＹ両方向の検出特性が揃っている。その結果、前
記したようなＸＹ方向の起電力Ｅを合成して得られる磁
界の中心方向の検出精度が向上する。 〔磁界発生***置検出装置〕上記のような構造の磁界の
中心方向検出器１０が４個、それぞれのＸＹ方向の検出
コイル部２０ｘ、２０ｙで構成する平面が互いに一致し
ＸＹ方向の検出コイル部２０ｘ、２０ｙがそれぞれ互い
に平行になるように、前記した正方形の頂点位置Ｓａ…
ごとに配置されて磁界発生***置検出装置を構成してい
る。したがって、各磁界の中心方向検出器１０ａ…のＸ
Ｙ平面が磁界発生***置検出装置の検出平面となる。Since the electromotive force E in the Z-axis direction corresponding to the Z-axis direction component of the magnetic field vector V is also generated in the detection coil section 20z, if the electromotive forces E in the XYZ axis directions are combined, the magnetic field vector 3 will be three. Although the dimension direction can be known, it is usually sufficient to know the direction of the magnetic field vector V on the XY plane. In the magnetic field center direction detector 10 of the above-described embodiment, the detection coil portions 20x and 20y in the XY directions are provided with the coils 22 and 22 which are divided in the axial direction, respectively. Only the connecting conductors 24 to be connected intersect with each other, and the coils 22 in the XY directions have the same structure and do not overlap or interfere with each other, so that the detection characteristics in both the XY directions are uniform. As a result, the detection accuracy in the central direction of the magnetic field obtained by combining the electromotive forces E in the XY directions as described above is improved. [Magnetic field generator position detection device] Four center direction detectors 10 of the magnetic field having the above-described structure, the planes formed by the respective detection coil sections 20x and 20y in the XY directions are coincident with each other and the detection coil section in the XY directions is provided. The apex positions Sa of the above-mentioned squares are arranged so that 20x and 20y are parallel to each other.
The magnetic field generator position detecting device is configured by arranging each of them. Therefore, X of the central direction detectors 10a ...
The Y plane serves as the detection plane of the magnetic field generator position detection device.

【００３０】磁界発生***置検出装置には、各磁界の中
心方向検出器１０で検出された検出信号を電気的に演算
処理するマイクロコンピュータなどの演算処理装置や検
出データを記憶する記憶装置、検出結果を表示する表示
装置なども備えている。 〔磁界発生***置検出方法〕上記のような磁界発生***
置検出装置を用いる磁界発生***置検出方法について説
明する。The magnetic field generator position detecting device includes an arithmetic processing device such as a microcomputer for electrically arithmetically processing the detection signal detected by the center direction detector 10 of each magnetic field, a storage device for storing detection data, and a detection device. A display device for displaying the result is also provided. [Magnetic field generator position detection method] A magnetic field generator position detection method using the above magnetic field generator position detection device will be described.

【００３１】図１において、紙面が被測定平面であり、
紙面と直交する方向の延長線上に磁界発生体が存在する
ものと仮定する。磁界発生体から発生する磁界の磁界の
中心軸が紙面を貫通する点Ｐｏが磁界の中心軸貫通点で
ある。但し、検出を開始する段階では、磁界の中心軸貫
通点Ｐｏの正確な位置は不明である。磁界発生***置検
出装置の検出平面を紙面すなわち被測定平面に配置す
る。被測定平面上に設定された正方形の各頂点位置Ｓａ
〜Ｓｄごとに磁界の中心方向検出器１０ａ〜１０ｄが配
置される。磁界の中心軸貫通点Ｐｏが磁界の中心方向検
出器１０ａ〜１０ｄで囲まれるように、磁界発生***置
検出装置を配置する。但し、正確な磁界の中心軸貫通点
Ｐｏは不明であるから、この段階では、磁界の中心軸貫
通点Ｐｏが存在するであろう領域を囲むように磁界発生
***置検出装置を配置すればよい。In FIG. 1, the paper surface is the plane to be measured,
It is assumed that the magnetic field generator exists on the extension line in the direction orthogonal to the paper surface. The point Po at which the central axis of the magnetic field of the magnetic field generated from the magnetic field generator penetrates the plane of the drawing is the central axis penetration point of the magnetic field. However, at the stage of starting the detection, the exact position of the central axis penetration point Po of the magnetic field is unknown. The detection plane of the magnetic field generator position detection device is arranged on the plane of the drawing, that is, the plane to be measured. Each vertex position Sa of the square set on the measured plane
The magnetic field center direction detectors 10a to 10d are arranged for each of ~ Sd. The magnetic field generator position detection device is arranged such that the central axis penetration point Po of the magnetic field is surrounded by the magnetic field center direction detectors 10a to 10d. However, since the exact center axis penetration point Po of the magnetic field is unknown, at this stage, the magnetic field generator position detection device may be arranged so as to surround the region where the center axis penetration point Po of the magnetic field may exist. .

【００３２】この状態で、各磁界の中心方向検出器１０
ａ〜１０ｄによって検出地点Ｓａ〜Ｓｄの磁界ベクトル
Ｖａ〜Ｖｄの方向を検出する。各磁界ベクトルＶａ〜Ｖ
ｄの方向を延長すれば、互いの交点Ｐab、Ｐac、Ｐad、
Ｐbc、Ｐbd、Ｐcdが求まる。交点Ｐab、Ｐad、Ｐbdは、
検出地点Ｓａ〜Ｓｄが構成する正方形の中にあって互い
に一致しており、この複数の交点が一致する地点を磁界
の中心軸貫通点Ｐｏであると判定する。In this state, the center direction detector 10 for each magnetic field is detected.
The directions of the magnetic field vectors Va to Vd at the detection points Sa to Sd are detected by a to 10d. Each magnetic field vector Va-V
If the direction of d is extended, the intersection points Pab, Pac, Pad,
Pbc, Pbd, and Pcd are obtained. The intersection points Pab, Pad, Pbd are
It is determined that a point in the square formed by the detection points Sa to Sd that are coincident with each other and that the plurality of intersections coincide with each other is the central axis penetration point Po of the magnetic field.

【００３３】３つの磁界ベクトルＶａ、Ｖｂ、Ｖｄの方
向が磁界の中心軸貫通点Ｐｏで一致することから、これ
らの磁界ベクトルＶａ…は、磁気障害物による磁界の乱
れの影響を受けておらず、残りの一つの磁界ベクトルＶ
ｃのみが磁気障害物による磁界の乱れの影響を受けてい
るものと推定できる。磁界の中心方向検出器１０ａ…
は、磁界の中心軸貫通点Ｐｏの四方に配置されているの
で、一方向の磁界の中心方向検出器１０ｃが磁気障害物
の影響を受けても、残りの３方向の磁界の中心方向検出
器１０ａ、１０ｂ、１０ｃは磁気障害物の影響を受けず
正確な磁界の中心方向を示すことができる。Since the directions of the three magnetic field vectors Va, Vb and Vd coincide at the central axis penetration point Po of the magnetic field, these magnetic field vectors Va ... Are not affected by the disturbance of the magnetic field by the magnetic obstacles. , The remaining one magnetic field vector V
It can be estimated that only c is affected by the disturbance of the magnetic field due to the magnetic obstacle. Magnetic field center direction detector 10a ...
Are arranged on all four sides of the central axis penetrating point Po of the magnetic field, so even if the central direction detector 10c of the magnetic field in one direction is affected by a magnetic obstacle, the central direction detectors of the magnetic fields in the remaining three directions are Reference numerals 10a, 10b, and 10c can accurately indicate the center direction of the magnetic field without being affected by the magnetic obstacle.

【００３４】上記のようにして求められた磁界の中心軸
貫通点Ｐｏから被測定平面すなわち紙面と直交する方向
に延長した線上で磁界発生体が存在するものと判断でき
る。 〔磁界発生***置検出装置の配置方法〕上記検出方法
で、磁界発生***置検出装置の各磁界の中心方向検出器
１０ａ…を磁界の中心軸貫通点Ｐｏを囲むように配置す
るには、予め、磁界の中心軸貫通点Ｐｏが存在する可能
性のある領域を調べておくことが好ましい。It can be determined that the magnetic field generator exists on the line extending from the central axis penetration point Po of the magnetic field obtained as described above in the direction perpendicular to the plane to be measured, that is, the paper surface. [Arrangement Method of Magnetic Field Generator Position Detecting Device] In the above detecting method, in order to arrange the central direction detectors 10a of the respective magnetic fields of the magnetic field generator position detecting device so as to surround the central axis penetration point Po of the magnetic field, It is preferable to check the area where the central axis penetration point Po of the magnetic field may exist.

【００３５】そのためには、磁界発生***置検出装置を
被測定平面上で走査して、各磁界の中心方向検出器１０
ａ…で検出される磁界の強さが最も大きくなる場所を求
め、この磁界の強さの最大地点を囲むように各磁界の中
心方向検出器１０ａ…を配置すれば、各磁界の中心方向
検出器１０ａ…で囲まれた領域内に磁界の中心軸貫通点
Ｐｏが存在する可能性が高くなる。To this end, the magnetic field generator position detecting device is scanned on the plane to be measured, and the center direction detector 10 for each magnetic field is detected.
If the location where the strength of the magnetic field detected by a ... Is maximized is obtained and the center direction detectors 10a for each magnetic field are arranged so as to surround the maximum point of this magnetic field strength, the center direction detection of each magnetic field is detected. The central axis penetration point Po of the magnetic field is more likely to be present in the area surrounded by the vessels 10a.

【００３６】これは、磁気障害物が存在していたとして
も、磁界発生体の磁界の中心軸貫通点Ｐｏの近くで磁界
の強さが最も大きくなるはずであり、各磁界の中心方向
検出器１０ａ…で囲まれた領域の何れかの地点に磁界の
中心軸貫通点Ｐｏが存在していれば、十分に正確な検出
が可能である。磁界の中心軸貫通点Ｐｏの位置を推定す
る際に、磁界の中心方向検出器１０ａ…のＺ軸方向の検
出コイル部２０ｚを利用することができる。磁界の中心
軸貫通点Ｐｏの近傍では、磁界ベクトルＶは被測定平面
に対して鉛直方向に近い方向を向くから、磁界ベクトル
ＶのＺ軸方向成分がＺＹ軸方向成分に比べて十分に大き
くなる。This means that even if there is a magnetic obstacle, the strength of the magnetic field should be maximized near the central axis penetration point Po of the magnetic field of the magnetic field generator, and the central direction detector of each magnetic field should be detected. If the central axis penetrating point Po of the magnetic field exists at any point in the region surrounded by 10a ..., It is possible to perform sufficiently accurate detection. When estimating the position of the central axis penetration point Po of the magnetic field, the detection coil unit 20z in the Z axis direction of the magnetic field central direction detector 10a can be used. In the vicinity of the central axis penetration point Po of the magnetic field, the magnetic field vector V faces a direction close to the vertical direction with respect to the plane to be measured, so that the Z-axis direction component of the magnetic field vector V becomes sufficiently larger than the ZY-axis direction component. .

【００３７】そこで、ひとつの磁界の中心方向検出器１
０ａで、ＸＹＺ軸方向の検出信号を比較し、Ｚ軸方向成
分が他の方向成分よりも最も大きくなった地点を、仮の
磁界の中心軸貫通点Ｐｏとして、この地点を囲むように
磁気発生体検出装置を配置すればよい。 〔地下物体検出方法〕上記磁界測定装置および磁界測定
方法を、推進工法における掘進装置の位置検出に適用し
た場合について説明する。Therefore, one magnetic field center direction detector 1
At 0a, the detection signals in the XYZ axis directions are compared, and the point where the Z axis direction component becomes the largest compared to the other direction components is set as the central axis penetration point Po of the provisional magnetic field, and the magnetic field is generated so as to surround this point. The body detection device may be arranged. [Underground Object Detection Method] A case will be described in which the magnetic field measurement device and the magnetic field measurement method described above are applied to position detection of an excavation device in a propulsion method.

【００３８】図５(a) に示すように、地盤５０の内部を
掘進装置３０と掘進装置３０の後方に連結された埋設管
３２…が推進される。掘進装置３０には磁界発生器４０
が設置されている。磁界発生器４０は、導線が巻回され
たコイルからなり、コイルの軸方向が鉛直方向を向いて
いる。磁界発生器４０のコイルに通電すれば、コイルの
両端をループ状に結ぶ磁界が発生する。As shown in FIG. 5 (a), the excavation device 30 and the buried pipes 32 connected to the rear of the excavation device 30 are propelled inside the ground 50. The excavator 30 includes a magnetic field generator 40.
Is installed. The magnetic field generator 40 is composed of a coil wound with a conductive wire, and the axial direction of the coil is oriented vertically. When the coil of the magnetic field generator 40 is energized, a magnetic field connecting both ends of the coil in a loop is generated.

【００３９】磁界発生器４０から地表面Ｇに向けて磁力
線Ｍが延びる。鉛直断面でみると、地表面Ｇでの磁力線
Ｍの方向は、磁界発生器４０に近い位置では鉛直方向に
近くなり、磁界発生器４０から遠い位置では鉛直方向か
ら傾斜した水平方向に近い状態になる。図５(b) に示す
ように、地表面における磁力線Ｍの方向を水平面でみる
と、磁界発生器４０の真上の地点すなわち磁界の中心軸
貫通点Ｐｏを中心にして、放射線状に磁力線Ｍが延び
る。Magnetic field lines M extend from the magnetic field generator 40 toward the ground surface G. In the vertical cross section, the direction of the magnetic field lines M on the ground surface G is close to the vertical direction at a position close to the magnetic field generator 40, and is close to the horizontal direction inclined from the vertical direction at a position far from the magnetic field generator 40. Become. As shown in FIG. 5 (b), when the direction of the magnetic field lines M on the ground surface is viewed on a horizontal plane, the magnetic field lines M are radiated radially around a point directly above the magnetic field generator 40, that is, a central axis penetration point Po of the magnetic field. Extends.

【００４０】但し、地盤５０中で磁界発生器４０の上方
には、鋼鉄の磁性体からなる磁気障害物６０が存在して
いる。そのため、磁気障害物６０の近くを通過する磁力
線Ｍが歪んでいる。図５(a) の垂直断面では、磁界発生
器４０から鉛直方向に延びる磁力線Ｍが磁気障害物６０
の方向に曲がっている。地表面Ｇにおいて、磁力線Ｍが
最も大きくなる地点は、磁界発生器４０の真上の磁界の
中心軸貫通点Ｐｏではなく、磁気障害物４０の上方に少
し寄った位置になる。磁界の中心軸貫通点Ｐｏでは、磁
力線Ｍが鉛直方向を向いておらず少し傾いている。逆
に、磁界の中心軸貫通点Ｐｏから少し離れた位置で、磁
力線Ｍが鉛直方向を向いている。However, above the magnetic field generator 40 in the ground 50, a magnetic obstacle 60 made of a magnetic material of steel exists. Therefore, the magnetic force lines M passing near the magnetic obstacle 60 are distorted. In the vertical cross section of FIG. 5 (a), the magnetic field lines M extending in the vertical direction from the magnetic field generator 40 are magnetic obstacles 60.
Is bent in the direction of. On the ground surface G, the point where the magnetic force line M becomes the largest is not a position Po which is the center axis penetration point of the magnetic field directly above the magnetic field generator 40, but a position slightly above the magnetic obstacle 40. At the central axis penetration point Po of the magnetic field, the magnetic force lines M are not oriented in the vertical direction but are slightly inclined. On the contrary, the magnetic force lines M face the vertical direction at a position slightly away from the central axis penetration point Po of the magnetic field.

【００４１】図５(b) の地表面Ｇでは、磁気障害物４０
の上方近くを通過する方向の磁力線Ｍが、磁気障害物４
０のほうに引き寄せられるように曲がっている。しか
し、磁界発生器４０に対して磁気障害物４０とは離れた
方向の磁力線Ｍは、ほぼ正確な放射方向へと延びてい
る。掘進装置３０すなわち磁気検出器４０の位置を検出
するには、地表面Ｇと平行に磁気発生体検出装置を配置
する。磁気発生体検出装置の検出地点Ｓａ〜Ｓｄを、磁
気発生器４０の真上すなわち磁界の中心軸貫通点Ｐｏを
囲むように配置する。掘進装置３０の推進位置は予め予
測できるので、磁界の中心軸貫通点Ｐｏを囲む位置に各
検出地点Ｓａ〜Ｓｄを配置するのは容易である。On the ground surface G of FIG. 5 (b), the magnetic obstacle 40
The magnetic field lines M in the direction of passing near the upper part of the
It is bent so that it can be drawn toward 0. However, the magnetic field lines M in the direction away from the magnetic obstacle 40 with respect to the magnetic field generator 40 extend in a substantially accurate radiation direction. To detect the position of the excavation device 30, that is, the magnetic detector 40, the magnetic generator detection device is arranged in parallel with the ground surface G. The detection points Sa to Sd of the magnetic generator detection device are arranged right above the magnetic generator 40, that is, so as to surround the central axis penetration point Po of the magnetic field. Since the propulsion position of the excavation device 30 can be predicted in advance, it is easy to arrange the detection points Sa to Sd at positions surrounding the central axis penetration point Po of the magnetic field.

【００４２】この状態で、各検出地点Ｓａ〜Ｓｄにおけ
る磁界ベクトルＶすなわち磁界の中心方向を検出する。
磁界の中心方向Ｖは磁力線Ｍの延びる方向の逆方向とな
る。この場合、検出地点Ｓａ〜Ｓｃについては磁界障害
物６０の影響を受けないので、磁界の中心方向Ｖａ〜Ｖ
ｃの延長線は磁界の中心軸貫通点Ｐｏで一致して交わ
る。検出地点Ｓｄで検出された磁界の中心方向Ｖｄは磁
界障害物６０の影響を受けるため、他の磁界の中心方向
Ｖａ〜Ｖｃの延長線との交点が磁界の中心軸貫通点Ｐｏ
とは一致しなくなる。In this state, the magnetic field vector V at each detection point Sa to Sd, that is, the central direction of the magnetic field is detected.
The central direction V of the magnetic field is opposite to the direction in which the magnetic force lines M extend. In this case, since the detection points Sa to Sc are not affected by the magnetic field obstacle 60, the magnetic field central directions Va to V are detected.
The extension lines of c coincide with each other and intersect at the central axis penetration point Po of the magnetic field. Since the central direction Vd of the magnetic field detected at the detection point Sd is influenced by the magnetic field obstacle 60, the intersection with the extension line of the central directions Va to Vc of the other magnetic field is the central axis penetration point Po of the magnetic field.
Will no longer match.

【００４３】しかし、複数の磁界の中心方向Ｖａ〜Ｖｃ
の交点が一致する点Ｐｏを磁界の中心軸貫通点であると
判定すれば、正確な磁界の中心軸貫通点Ｐｏが求められ
る。磁界の中心軸貫通点Ｐｏの真下に磁界発生器４０お
よび掘進装置３０が存在することが判る。 〔その他の実施例〕 (a) 磁界の中心方向検出器１０は、検出平面上における
その地点の磁界の中心方向を検出することができれば、
磁界の中心方向の検出原理や具体的な構造については、
前記実施例以外にも変更することができる。コイル２２
の配置やコイルの支持構造などは、通常の磁気測定装置
と同様の構造を採用することができる。However, the central directions Va to Vc of a plurality of magnetic fields
If it is determined that the point Po at which the intersections of the two coincide with each other is the center axis penetration point of the magnetic field, an accurate center axis penetration point Po of the magnetic field can be obtained. It can be seen that the magnetic field generator 40 and the excavation device 30 are located directly below the central axis penetration point Po of the magnetic field. [Other Embodiments] (a) The magnetic field center direction detector 10 can detect the center direction of the magnetic field at that point on the detection plane.
Regarding the principle of detection of the magnetic field center direction and the specific structure,
It is possible to change other than the above embodiment. Coil 22
The arrangement and the coil support structure may be the same as those of ordinary magnetic measurement devices.

【００４４】(b) 磁界の中心方向検出器１０は、前記実
施例のようにＸＹＺ３軸方向に検出コイル部２０ｘ〜２
０ｚを備えたもののほか、ＸＹ２軸方向のみに検出コイ
ル部２０ｘ、２０ｙを備えたものであってもよい。 (c) 磁界の中心方向の検出は、前記実施例のように４地
点で行えば実用上は十分に正確な磁界発生体の検出が可
能である。但し、５地点以上の多数個所で磁界の中心方
向の検出を行って、得られたデータを総合的に評価する
ことで、より誤差の少ない検出結果を得ることもでき
る。(B) The magnetic field center direction detector 10 has the detection coil sections 20x to 2 in the XYZ triaxial directions as in the above embodiment.
Besides 0z, the detection coil units 20x and 20y may be provided only in the XY biaxial directions. (c) If the magnetic field center direction is detected at four points as in the above embodiment, it is possible to detect the magnetic field generator sufficiently accurately in practical use. However, it is also possible to obtain a detection result with a smaller error by performing detection of the magnetic field center direction at a large number of points of 5 or more points and comprehensively evaluating the obtained data.

【００４５】(d) 磁界発生***置検出装置は、前記実施
例のように正方形の頂点位置ごとに磁界の中心方向検出
器１０ａ…を配置しておくのが、構造が簡単であり正確
な検出も行えるので好ましい。但し、正方形以外の正多
角形あるいは不等辺多角形の頂点に配置しておいてもよ
い。 (e) 本発明の磁界発生***置検出方法および装置は、前
記した推進工法における掘進装置の検出だけでなく、各
種の地下構造物の位置を検出したり、土木測量を行った
り、建築物の非破壊検査を行ったりするにも適用でき
る。(D) In the magnetic field generator position detecting device, the magnetic field center direction detectors 10a are arranged at each vertex position of the square as in the above embodiment, so that the structure is simple and accurate detection is possible. Is also preferable because it can be performed. However, they may be arranged at the vertices of a regular polygon or an isosceles polygon other than a square. (e) The magnetic field generator position detection method and device of the present invention is not only for detecting the excavation device in the above-mentioned propulsion method, but also for detecting the position of various underground structures, performing civil engineering surveys, and building construction. It can also be applied to non-destructive inspection.

【００４６】[0046]

【発明の効果】本発明の磁界発生***置検出方法は、前
記のような４地点以上で検出された磁界の中心方向から
磁界の中心軸貫通点の位置および磁気発生体の位置を検
出することにより、磁気障害物による影響を無くして、
正確な検出結果を得ることができる。磁気方向の検出自
体は通常の磁気測定方法や装置を用いて行えるので、検
出作業は簡単で作業コストも安くつく。According to the magnetic field generator position detecting method of the present invention, the position of the central axis penetrating point of the magnetic field and the position of the magnetic generator are detected from the center direction of the magnetic field detected at four or more points as described above. Eliminates the influence of magnetic obstacles,
An accurate detection result can be obtained. Since the detection of the magnetic direction itself can be performed by using a normal magnetic measurement method or device, the detection work is simple and the work cost is low.

【００４７】なお、磁界の中心方向を検出する工程で、
前記のような４個以上の磁界の中心方向検出器を備えた
磁界発生***置検出装置を用いれば、簡単な操作で正確
な検出結果を得ることができる。本発明の磁界発生***
置検出装置は、前記のような磁界発生***置検出方法
を、能率的に実行して、正確な検出結果を得ることがで
きる。In the step of detecting the central direction of the magnetic field,
By using the magnetic field generator position detecting device having the above-described four or more magnetic field center direction detectors, accurate detection results can be obtained by a simple operation. The magnetic field generator position detecting device of the present invention can efficiently execute the magnetic field generator position detecting method as described above to obtain an accurate detection result.

【００４８】なお、磁界の中心方向検出器が、前記のよ
うなＸＹ両方向の検出コイル部と磁界の中心方向検出手
段を備えていれば、簡単な構造で正確な検出結果が得ら
れる。ＸＹ検出コイル部が、前記のような一対のコイル
を備えていれば、ＸＹ両方向の検出特性が揃い、磁界の
中心方向の検出が正確に行え、磁界発生体の検出精度が
向上する。If the magnetic field center direction detector is provided with the XY bidirectional detection coil portions and the magnetic field center direction detecting means as described above, an accurate detection result can be obtained with a simple structure. If the XY detection coil unit includes the pair of coils as described above, the detection characteristics in both the XY directions are uniform, the center direction of the magnetic field can be accurately detected, and the detection accuracy of the magnetic field generator is improved.

【００４９】本発明の地下物体検出方法は、前記した磁
界発生***置検出方法を適用することで、磁気障害物が
存在していても地下の物体を地上から簡単かつ正確に検
出することができる。その結果、推進工法など地下の物
体の位置を正確に知ることが要求される各種技術分野の
技術改善に大きく貢献することができる。なお、磁界発
生器が前記のようなコイルであれば、構造が簡単でかつ
高い性能が発揮でき、地下物体に内蔵させておくのも容
易である。By applying the above-mentioned magnetic field generator position detecting method to the underground object detecting method of the present invention, an underground object can be easily and accurately detected from the ground even if a magnetic obstacle is present. . As a result, it can greatly contribute to technical improvement in various technical fields in which it is required to accurately know the position of an underground object such as a propulsion method. If the magnetic field generator is a coil as described above, the structure is simple and high performance can be exhibited, and it can be easily incorporated in an underground object.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の実施例となる磁界発生***置検出装置
の配置構造図FIG. 1 is a layout structure diagram of a magnetic field generator position detection device according to an embodiment of the present invention.

【図２】磁界の中心方向検出器の一部断面構造図FIG. 2 is a partial cross-sectional structural diagram of a magnetic field center direction detector.

【図３】磁界の中心方向検出器の要部拡大断面図FIG. 3 is an enlarged cross-sectional view of a main part of a magnetic field center direction detector.

【図４】磁界の中心方向検出器の動作を説明する概略構
造図(a) および検出信号線図(b)FIG. 4 is a schematic structural diagram (a) and a detection signal diagram (b) for explaining the operation of the magnetic field center direction detector.

【図５】地下物体の検出方法の実施例を表す縦断面図
(a) および平面図(b)FIG. 5 is a vertical sectional view showing an embodiment of a method for detecting an underground object.
(a) and plan view (b)

【符号の説明】[Explanation of symbols]

１０ａ〜１０ｄ 磁界の中心方向検出器 ２０ｘ、２０ｙ、２０ｚ 検出コイル部 ２２ コイル ２４ 接続導線 ３０ 掘進装置 ３２ 埋設管 ４０ 磁界発生器 ５０ 地盤 ６０ 磁気障害物 Ｖａ〜Ｖｄ 磁界ベクトル 10a-10d Center direction detector of magnetic field 20x, 20y, 20z Detection coil part 22 Coil 24 Connection conductor 30 Excavator 32 Buried pipe 40 Magnetic field generator 50 Ground 60 Magnetic obstacle Va-Vd Magnetic field vector

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】磁界発生体の磁界の中心軸と直交する被測
定平面上で、前記被測定平面に対する前記磁界中心軸の
貫通点を囲む４地点以上において磁界の中心方向を検出
する工程と、 前記各地点における磁界の中心方向同士の交点を求める
工程と、 前記各交点のうち最も多数の交点が集中する位置を前記
磁界の中心軸貫通点であると判定する工程と、 前記磁界の中心軸貫通点から前記被測定平面と直交する
方向に前記磁界発生体が存在すると判断する工程とを備
える磁界発生***置検出方法。1. A step of detecting a central direction of a magnetic field at four or more points surrounding a penetration point of the magnetic field central axis with respect to the measured plane on a measured plane orthogonal to the central axis of the magnetic field of the magnetic field generator, A step of obtaining an intersection between the center directions of the magnetic fields at the respective points, a step of determining a position where the largest number of the intersections are concentrated as a central axis penetration point of the magnetic field, and a central axis of the magnetic field And a step of determining that the magnetic field generator is present in a direction orthogonal to the measured plane from a penetration point. 【請求項２】前記磁界の中心方向を検出する工程が、 検出平面上におけるその地点の磁界の中心方向を検出す
る磁界の中心方向検出器が、前記検出平面上に設定され
た多角形の各頂点位置ごとに合計４個以上配置された磁
界発生***置検出装置を準備する工程と、 前記被測定平面上に、前記検出平面が前記被測定平面と
一致し、前記各磁界の中心方向検出器が前記磁界の中心
軸貫通点を囲んで配置されるように前記磁界発生***置
検出装置を配置する工程と、 前記各磁界の中心方向検出器でそれぞれの配置地点にお
ける前記磁界の中心方向を検出する工程とを含む請求項
１に記載の磁界発生***置検出方法。2. The step of detecting the center direction of the magnetic field comprises: a magnetic field center direction detector for detecting the center direction of the magnetic field at that point on the detection plane; each of the polygons set on the detection plane. Preparing a total of four or more magnetic field generator position detectors arranged at each apex position; and on the measurement plane, the detection plane coincides with the measurement plane, and the center direction detector of each magnetic field is detected. Arranging the magnetic field generator position detection device so as to surround the central axis penetrating point of the magnetic field, and detecting the central direction of the magnetic field at each arrangement point with the central direction detector of each magnetic field. The magnetic field generator position detecting method according to claim 1, further comprising: 【請求項３】請求項２の磁界発生***置検出方法に用い
る磁界発生***置検出装置であって、 検出平面上におけるその地点の磁界の中心方向を検出す
る磁界の中心方向検出器が、前記検出平面上に設定され
た多角形の各頂点位置ごとに合計４個以上配置された磁
界発生***置検出装置。3. A magnetic field generator position detecting device for use in the magnetic field generator position detecting method according to claim 2, wherein a magnetic field center direction detector for detecting the center direction of the magnetic field at the point on the detection plane is provided. A magnetic field generator position detection device in which a total of four or more are arranged for each vertex position of the polygon set on the detection plane. 【請求項４】前記磁界の中心方向検出器が、 前記検出平面上で互いに直交する方向にそれぞれの軸方
向が配置されたＸＹ両方向の検出コイル部と、 前記ＸＹ検出コイル部の検出信号を比較して前記磁界の
中心方向を検出する磁界の中心方向検出手段とを備える
請求項３に記載の磁界発生***置検出装置。4. The center direction detector of the magnetic field compares a detection signal of the XY detection coil unit with a detection coil unit of both XY directions in which respective axial directions are arranged in directions orthogonal to each other on the detection plane. 4. The magnetic field generator position detection device according to claim 3, further comprising magnetic field center direction detection means for detecting the center direction of the magnetic field. 【請求項５】前記ＸＹ検出コイル部が、同軸上で前後に
間隔をあけて配置され電気的に接続された一対のコイル
を有し、前記一対のコイルの間で前記ＸＹ検出コイル部
が互いに直交し、前記ＸＹ検出コイル部の前記コイル同
士が間隔をあけて配置されている請求項４に記載の磁界
発生***置検出装置。5. The XY detection coil section has a pair of coils that are coaxially arranged at anteroposterior intervals and are electrically connected to each other, and the XY detection coil section is mutually connected between the pair of coils. The magnetic field generator position detection device according to claim 4, wherein the coils of the XY detection coil unit are orthogonal to each other and are spaced from each other. 【請求項６】地下に配置された物体を地上で検出する方
法であって、 前記地下に前記物体とともに配置された磁界発生器で鉛
直方向に中心軸を有する磁界を発生させる工程と、 前記請求項１または２の磁界発生***置検出方法を、前
記被測定平面を前記地上で地表面と平行な平面に設定し
て実行して前記磁界の中心軸貫通点を求める工程と、 前記磁界の中心軸貫通点の真下の地下に前記物体が存在
すると判断する工程とを備える地下物体検出方法。6. A method for detecting an object placed underground, on the ground, comprising: generating a magnetic field having a central axis in the vertical direction with a magnetic field generator placed together with the object underground. The step of determining the magnetic field generator position detection method according to Item 1 or 2 by setting the measured plane to a plane parallel to the ground surface on the ground to obtain the central axis penetration point of the magnetic field, and the center of the magnetic field. And a step of determining that the object exists in the underground just below the axis penetration point. 【請求項７】前記磁界発生器が、通電により交番磁界を
発生するコイルである請求項６に記載の地下物体検出方
法。7. The method for detecting an underground object according to claim 6, wherein the magnetic field generator is a coil that generates an alternating magnetic field when energized.
JP6302395A 1995-03-22 1995-03-22 Method and device for detecting position of magnetic field-generating body, and method for detecting underground object Pending JPH08261708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6302395A JPH08261708A (en) 1995-03-22 1995-03-22 Method and device for detecting position of magnetic field-generating body, and method for detecting underground object

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6302395A JPH08261708A (en) 1995-03-22 1995-03-22 Method and device for detecting position of magnetic field-generating body, and method for detecting underground object

Publications (1)

Publication Number Publication Date
JPH08261708A true JPH08261708A (en) 1996-10-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP6302395A Pending JPH08261708A (en) 1995-03-22 1995-03-22 Method and device for detecting position of magnetic field-generating body, and method for detecting underground object

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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001235089A (en) * 2000-02-21 2001-08-31 Tokyo Gas Co Ltd Pig locator and method of chasing pig
JP2016038320A (en) * 2014-08-08 2016-03-22 株式会社日本自動車部品総合研究所 Position estimation device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001235089A (en) * 2000-02-21 2001-08-31 Tokyo Gas Co Ltd Pig locator and method of chasing pig
JP2016038320A (en) * 2014-08-08 2016-03-22 株式会社日本自動車部品総合研究所 Position estimation device

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