JP3500515B2 - Pressure sensitive cable - Google Patents
Pressure sensitive cableInfo
- Publication number
- JP3500515B2 JP3500515B2 JP07290295A JP7290295A JP3500515B2 JP 3500515 B2 JP3500515 B2 JP 3500515B2 JP 07290295 A JP07290295 A JP 07290295A JP 7290295 A JP7290295 A JP 7290295A JP 3500515 B2 JP3500515 B2 JP 3500515B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- cable
- sensitive cable
- resistance layer
- sensitive
- 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 - Fee Related
Links
Landscapes
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
- Geophysics And Detection Of Objects (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は地すべり地帯における地
すべり面の深さを検出する方式に適した感圧ケーブルに
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive cable suitable for a method of detecting the depth of a landslide surface in a landslide area.
【0002】[0002]
【従来の技術】従来、地すべり対策工事を行う場合に
は、地すべり地帯におけるすべり面の深さを測定するこ
とで対策工事の場所選定と規模を決定している。すべり
面の深さ測定方法としては、次の2通りの方法がある。
第1の方法は、地すべり地帯に垂直にボーリング孔を掘
り、このボーリング孔内に同軸ケーブルを挿入配置し、
ケーブルの周囲をモルタル等で間詰めを行い、地すべり
の発生による断線でケーブル長が短くなることを利用し
ている。この第1の方法では、地上側のケーブル端より
パルスを入射させ、断線部からの反射信号が検出される
までの時間を測定することでケーブル端から断線部まで
のケーブル長を測定し、測定されたケーブル長から地上
部分のケーブルの長さを引くことで地すべり面の深さを
求める。2. Description of the Related Art Conventionally, when carrying out landslide countermeasure work, the site selection and scale of the countermeasure work are determined by measuring the depth of the slip surface in the landslide area. There are the following two methods for measuring the depth of the slip surface.
The first method is to dig a boring hole vertically in the landslide area, insert a coaxial cable in the boring hole,
We use the fact that the cable length is shortened due to disconnection due to the occurrence of landslides by packing the area around the cable with mortar. In this first method, a pulse is injected from the cable end on the ground side, and the time until the reflected signal from the disconnection part is detected is measured to measure the cable length from the cable end to the disconnection part. The depth of the landslide surface is obtained by subtracting the length of the cable on the ground from the calculated cable length.
【0003】第2の方法は、ボーリング孔内に同軸状の
感圧ケーブルを挿入配置し、感圧ケーブル周囲を砂等で
間詰めを行い、地すべりの発生による圧縮により感圧ケ
ーブルに短絡を生ずることを利用している。この第2の
方法でも、感圧ケーブルの地上端よりパルスを入射さ
せ、入射波とは極性が異なる反射波が検出されるまでの
時間を測定することで地上端から圧縮発生位置までの長
さを測定し、測定された長さから地上部分の感圧ケーブ
ルの長さを引くことで地すべり面の深さを求める。In the second method, a coaxial pressure-sensitive cable is inserted and arranged in the boring hole, the circumference of the pressure-sensitive cable is packed with sand or the like, and a short circuit occurs in the pressure-sensitive cable due to compression due to occurrence of landslide. I'm taking advantage of that. Also in this second method, a pulse is injected from the ground end of the pressure-sensitive cable, and the time from when the reflected wave having a polarity different from that of the incident wave is detected to measure the length from the ground end to the compression generation position. Then, the depth of the landslide surface is obtained by subtracting the length of the pressure-sensitive cable on the ground from the measured length.
【0004】上記第2の方法に基づく感圧ケーブル構造
は、図7に示す通りである。図7において、中心導体7
1の周囲に導電性ゴム72を被覆し、その外側にナイロ
ン糸編組73を設けている。ナイロン糸編組73の外側
には導電性ゴム74を巻き、その外側に金属シールド7
5を配置し、更にその外側をシース76で被覆してい
る。このように構成された感圧ケーブルが圧縮を受ける
と、感圧ケーブルは変形してナイロン糸編組73の隙間
に導電性ゴム72が入り込み、中心導体71と金属シー
ルド75が10Ω程度の抵抗で短絡される。その結果、
入射端よりパルスを入射させると、入射波とは逆極性の
反射波が入射端で得られる。中心導体71と金属シール
ド75間の電気抵抗は、導電性ゴム72の接触面積と反
比例の関係にあり、外部圧力が強まると電気抵抗は小さ
くなる。A pressure-sensitive cable structure based on the second method is as shown in FIG. In FIG. 7, the center conductor 7
1 is covered with a conductive rubber 72, and a nylon thread braid 73 is provided on the outside thereof. A conductive rubber 74 is wound around the nylon thread braid 73, and the metal shield 7 is wound around the conductive rubber 74.
5 is arranged, and the outside thereof is covered with a sheath 76. When the pressure-sensitive cable configured as described above is compressed, the pressure-sensitive cable is deformed and the conductive rubber 72 enters the gap between the nylon thread braids 73, and the center conductor 71 and the metal shield 75 are short-circuited with a resistance of about 10Ω. To be done. as a result,
When a pulse is made incident from the incident end, a reflected wave having a polarity opposite to that of the incident wave is obtained at the incident end. The electric resistance between the central conductor 71 and the metal shield 75 is in inverse proportion to the contact area of the conductive rubber 72, and the electric resistance decreases as the external pressure increases.
【0005】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来の方法では、感圧ケーブルを地中に長期間設置した場
合、シースを通して水分がナイロン糸編組に入り込むた
めに中心導体と金属シールド間の絶縁が劣化する傾向が
示されていた。このため感圧ケーブルが長い場合には減
衰が大きくなり、反射波が得られなくなるという欠点が
あった。However, in the above-mentioned conventional method, when the pressure-sensitive cable is installed in the ground for a long period of time, moisture is introduced into the nylon yarn braid through the sheath, so that insulation between the center conductor and the metal shield is caused. It showed a tendency to deteriorate. Therefore, when the pressure-sensitive cable is long, there is a drawback that the attenuation becomes large and the reflected wave cannot be obtained.
【0006】そこで本発明の課題は、前記のような従来
の感圧ケーブルの持つ問題を解決し、耐水性が良く、位
置の異なる複数の圧縮点の検出をも可能にする地すべり
面検出用の感圧ケーブルを提供することにある。Therefore, an object of the present invention is to detect a landslide surface which solves the problems of the conventional pressure-sensitive cable as described above, has good water resistance, and enables detection of a plurality of compression points at different positions. To provide a pressure sensitive cable.
【0007】[0007]
【課題を解決するための手段】本発明によれば、中心導
体の周囲に抵抗層を設け、該抵抗層の外側に絶縁体より
なるスペーサを間隔をおいて配置し、該スペーサの外側
に金属管を配置し、該金属管の外側に絶縁シースを施
し、前記抵抗層を、前記中心導体の周囲に導電性塗料を
塗布して形成したことを特徴とする感圧ケーブルが得ら
れる。According to the present invention, a resistance layer is provided around a center conductor, spacers made of an insulator are arranged at intervals outside the resistance layer, and a metal is provided outside the spacer. A tube is arranged, an insulating sheath is provided on the outside of the metal tube , the resistance layer is provided , and a conductive paint is applied around the center conductor.
A pressure-sensitive cable characterized by being formed by coating is obtained.
【0008】[0008]
【0009】また、前記スペーサは、前記抵抗層の外側
にリング状の絶縁体を長さ方向に間隔をおいて配置して
形成される。The spacers are formed by arranging ring-shaped insulators on the outer side of the resistance layer at intervals in the lengthwise direction.
【0010】また、前記スペーサを、前記抵抗層の外側
に絶縁体による線状体を螺旋状に巻き付けて形成するよ
うにしても良い。The spacer may be formed by spirally winding a linear body made of an insulating material on the outside of the resistance layer.
【0011】[0011]
【作用】上記の地すべり面検出用の感圧ケーブルにおい
ては、地すべりの発生によりすべり面において感圧ケー
ブルが圧縮を受けた場合、抵抗層を挾む状態で中心導体
と金属管が接触することからケーブル自体の持つ特性イ
ンピーダンスに変化が生じる。そこで、ケーブル端から
パルスを入射させた場合には圧縮点からの反射波がケー
ブルの入射端において観測され、入射波から反射波まで
の時間を測定することで、入射端から圧縮点までの長さ
が判り、地すべり面の深さが求まることになる。In the above pressure-sensitive cable for detecting the landslide surface, when the pressure-sensitive cable is compressed on the slip surface due to the occurrence of landslide, the center conductor and the metal pipe contact each other while sandwiching the resistance layer. The characteristic impedance of the cable itself changes. Therefore, when a pulse is incident from the cable end, the reflected wave from the compression point is observed at the incident end of the cable, and by measuring the time from the incident wave to the reflected wave, the length from the incident end to the compression point can be measured. The depth of the landslide surface can be obtained by knowing the depth.
【0012】特に、本方式では抵抗層の存在により中心
導体と金属管が直接短絡されることが無く、水の進入を
防止する効果が高まるため、位置の異なる複数の圧縮点
からの反射波をパルス入射端で観測することができる特
徴がある。In particular, in this method, the presence of the resistance layer does not directly short-circuit the central conductor and the metal tube, and the effect of preventing water from entering is enhanced, so that reflected waves from a plurality of compression points at different positions are generated. There is a feature that it can be observed at the pulse incident end.
【0013】[0013]
【実施例】次に、本発明の実施例を図面を参照して詳細
に説明する。図1は本発明の第1の実施例の構成を示す
図である。中心導体11の周囲には抵抗体を塗布して抵
抗層12を形成する。抵抗層12の材料は、抵抗率の高
いものよりもむしろ導電性材料が好ましい。抵抗層12
の外側には絶縁材よりなるリング状のスペーサ13を長
さ方向に間隔をおいて配置して絶縁層を形成する。この
外側に金属管14を配置し、その外側に絶縁材のシース
15を施すことで感圧ケーブルが形成される。このケー
ブルに強度の圧縮力が作用すると、中心導体11と金属
管14は圧縮点において抵抗層12を挾んで接触するた
め、中心導体11と金属管14間の抵抗は0Ωにはなら
ず、ケーブル自体の特性インピーダンスの約1/2程度
の抵抗値に保つことが可能となる。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a diagram showing the configuration of the first embodiment of the present invention. A resistor is applied around the center conductor 11 to form a resistor layer 12. The material of the resistive layer 12 is preferably a conductive material rather than a material having a high resistivity. Resistance layer 12
The ring-shaped spacers 13 made of an insulating material are arranged on the outer side of the with an interval in the length direction to form an insulating layer. The pressure sensitive cable is formed by arranging the metal tube 14 on the outer side and applying the sheath 15 of the insulating material on the outer side. When a strong compressive force acts on this cable, the central conductor 11 and the metal tube 14 sandwich the resistance layer 12 at the compression point and come into contact with each other. Therefore, the resistance between the central conductor 11 and the metal tube 14 does not become 0Ω, and the cable It is possible to keep the resistance value at about ½ of its own characteristic impedance.
【0014】図2は本発明の第2の実施例の構成を示す
図である。中心導体11の周囲の抵抗体として導電性塗
料を塗布して抵抗層21を形成する。抵抗層21の外側
には絶縁材よりなる線状体22を、中心導体11を中心
にして螺旋状に巻き付け、絶縁層を形成する。この外側
に金属管14を配置し、その外側に絶縁材のシース15
を施すことで感圧ケーブルが形成される。このケーブル
に強度の圧縮力が作用すると、中心導体11と金属管1
4は圧縮点において抵抗層21を挾んで接触するため、
中心導体11と金属管14間は0Ωにはならず、ケーブ
ル自体の特性インピーダンスの約1/2程度の抵抗値に
保つことが可能となる。FIG. 2 is a diagram showing the configuration of the second embodiment of the present invention. A conductive paint is applied as a resistor around the center conductor 11 to form a resistance layer 21. A linear body 22 made of an insulating material is spirally wound around the central conductor 11 on the outer side of the resistance layer 21 to form an insulating layer. A metal tube 14 is arranged on the outer side of this, and a sheath 15 of an insulating material is arranged on the outer side thereof.
A pressure-sensitive cable is formed by applying. When a strong compressive force acts on this cable, the center conductor 11 and the metal tube 1
No. 4 sandwiches the resistance layer 21 at the compression point and makes contact therewith,
The resistance between the central conductor 11 and the metal tube 14 does not become 0Ω, and it is possible to maintain the resistance value of about 1/2 of the characteristic impedance of the cable itself.
【0015】図3は本発明の第3の実施例の構成を示す
図である。中心導体11の周囲の抵抗体として導電性ゴ
ムを塗り抵抗層31を形成する。抵抗層31の外側には
絶縁材よりなる線状体22を、中心導体11を中心にし
て巻き付け、絶縁層を形成する。この外側に金属管14
を配置し、その外側に絶縁材のシース15を施すことで
感圧ケーブルが形成される。このケーブルに強度の圧縮
力が作用した場合にも中心導体11と金属管14は圧縮
点において抵抗層31を挾んで接触するため、中心導体
11と金属管14間の抵抗は0Ωにはならず、ケーブル
自体の特性インピーダンスの約1/2程度の抵抗値に保
つことが可能となる。FIG. 3 is a diagram showing the configuration of the third embodiment of the present invention. A conductive rubber is applied as a resistor around the center conductor 11 to form a resistance layer 31. A linear body 22 made of an insulating material is wound around the resistance layer 31 around the center conductor 11 to form an insulating layer. Metal tube 14 on the outside
Is arranged, and a sheath 15 made of an insulating material is applied to the outside thereof to form a pressure-sensitive cable. Even when a strong compressive force acts on this cable, the central conductor 11 and the metal tube 14 sandwich the resistance layer 31 at the compression point and come into contact with each other. Therefore, the resistance between the central conductor 11 and the metal tube 14 does not become 0Ω. It is possible to keep the resistance value at about 1/2 of the characteristic impedance of the cable itself.
【0016】図4は本発明の第4の実施例の構成を示す
図である。中心導体11の周囲の抵抗体として導電性プ
ラスチックを塗布して抵抗層41を形成する。抵抗層4
1の外側には絶縁材よりなる線状体22を、中心導体1
1を中心にして螺旋状に巻き付け、絶縁層を形成する。
この外側に金属管14を配置し、その外側に絶縁材のシ
ース15を施すことで感圧ケーブルが形成される。この
ケーブルに強度の圧縮力が作用すると、中心導体11と
金属管14は抵抗層41を挾んで接触するため、中心導
体11と金属管14間の抵抗は0Ωにはならず、ケーブ
ル自体の特性インピーダンスの約1/2程度の抵抗値に
保つことが可能となる。FIG. 4 is a diagram showing the configuration of the fourth embodiment of the present invention. A conductive plastic is applied as a resistor around the center conductor 11 to form a resistance layer 41. Resistance layer 4
A linear member 22 made of an insulating material is provided on the outer side of the center conductor 1.
The insulating layer is formed by spirally winding it around 1.
The pressure sensitive cable is formed by arranging the metal tube 14 on the outer side and applying the sheath 15 of the insulating material on the outer side. When a strong compressive force acts on this cable, the central conductor 11 and the metal tube 14 sandwich the resistance layer 41 and come into contact with each other. Therefore, the resistance between the central conductor 11 and the metal tube 14 does not become 0Ω, and the characteristic of the cable itself. It is possible to maintain the resistance value at about ½ of the impedance.
【0017】図5は本発明による感圧ケーブルを使用し
て地すべり面の深さを測定する装置の一例を示す図であ
る。地すべり地帯には垂直にボーリング孔1が掘られ、
このボーリング孔1内には感圧ケーブル10が挿入配置
されている。感圧ケーブル10の周囲はモルタル2等で
間詰めを行っている。FIG. 5 is a diagram showing an example of an apparatus for measuring the depth of the landslide surface using the pressure-sensitive cable according to the present invention. Boring hole 1 was dug vertically in the landslide area,
A pressure sensitive cable 10 is inserted and arranged in the bore hole 1. The circumference of the pressure-sensitive cable 10 is filled with mortar 2 or the like.
【0018】図6をも参照して、発振回路51では一定
周期でトリガパルス(図6a)を発生し、増幅回路52
でトリガパルスを増幅して感圧ケーブル10の入射端よ
り中心導体11を通して入射する。なお、感圧ケーブル
10の金属管14は接地する。入射された入射波(図6
b)は圧縮点においてケーブルの特性インピーダンスが
著しく減少することから逆極性の反射波を生じ、その結
果、入射端に接続された反射波検出回路57においては
入射波と極性の異なる反射波(図6c)が検出される。
発振回路51のトリガパルスでRSフリップフロップ5
3のセットを行い、ゲート回路55を通した反射波(図
6e)でRSフリップフロップ53のリセットを行え
ば、RSフリップフロップ53の出力(図6f)はパル
スの伝搬時間だけハイレベルを出力する。Referring also to FIG. 6, the oscillation circuit 51 generates the trigger pulse (FIG. 6a) at a constant cycle, and the amplification circuit 52
The trigger pulse is amplified by and is incident from the incident end of the pressure-sensitive cable 10 through the central conductor 11. The metal tube 14 of the pressure sensitive cable 10 is grounded. Incident wave (Fig. 6)
In b), since the characteristic impedance of the cable is significantly reduced at the compression point, a reflected wave of opposite polarity is generated. As a result, in the reflected wave detection circuit 57 connected to the incident end, a reflected wave having a polarity different from that of the incident wave (Fig. 6c) is detected.
The RS flip-flop 5 is triggered by the trigger pulse of the oscillation circuit 51.
3 is set, and the RS flip-flop 53 is reset by the reflected wave (FIG. 6e) that has passed through the gate circuit 55, the output of the RS flip-flop 53 (FIG. 6f) outputs a high level for the pulse propagation time. .
【0019】複数の圧縮点からの反射波が想定される場
合には、遅延回路54とゲート回路55とを用いて入射
端から遠い方の圧縮点(すべり面2)からの反射波から
検出する方式を用いる。この出力を低域通過フィルタ5
6を通すことで直流出力(図6g)が得られ、その値は
感圧ケーブル10の入射端から反射点、すなわち圧縮点
までの距離に比例することになる。次に、遅延回路54
の時間設定を短くすることで図6(d)のハイレベル領
域をずらし、ゲート回路55を通した入射端に近い反射
波でRSフリップフロップ53をリセットすれば入射端
に近い圧縮点(すべり面1)までの長さを求めることが
可能となる。When reflected waves from a plurality of compression points are assumed, a delay circuit 54 and a gate circuit 55 are used to detect from reflected waves from a compression point (sliding surface 2) farther from the incident end. Use the method. This output is low pass filter 5
A DC output (FIG. 6g) is obtained by passing through 6, and the value is proportional to the distance from the incident end of the pressure-sensitive cable 10 to the reflection point, that is, the compression point. Next, the delay circuit 54
6D is shifted by shortening the time setting and the RS flip-flop 53 is reset by the reflected wave near the incident end that has passed through the gate circuit 55, and the compression point (slip surface) near the incident end It is possible to obtain the length up to 1).
【0020】[0020]
【発明の効果】以上の説明で明らかなように、本発明に
よれば、中心導体と外側の金属管で伝送線路を形成する
ことでパルス計測を可能とし、地すべり発生によるすべ
り面でのケーブルの圧縮で特性インピーダンスに変化が
生じる構造とし、しかも圧縮点における中心導体と金属
管間の抵抗が0Ωまで低下しない構造となっている。こ
の構造により、複数のすべり面深度を検出する際に問題
となる0Ω短絡を防止することができることと、金属管
を使用することで水の進入を防止することができるた
め、1本のケーブルを設置することで長期にわたり複数
の深さのすべり面検出を可能にするなど得られる効果は
大である。As is apparent from the above description, according to the present invention, it is possible to measure a pulse by forming a transmission line with a central conductor and an outer metal tube, and to perform cable measurement on a slip surface due to occurrence of a landslide. The structure is such that the characteristic impedance changes due to compression, and the resistance between the central conductor and the metal tube at the compression point does not decrease to 0Ω. With this structure, it is possible to prevent a 0Ω short circuit, which is a problem when detecting multiple slip surface depths, and it is possible to prevent water from entering by using a metal tube. By installing it, it is possible to detect slip planes at multiple depths over a long period of time, which is very effective.
【図1】本発明の第1の実施例の構成を示す図である。FIG. 1 is a diagram showing a configuration of a first exemplary embodiment of the present invention.
【図2】本発明の第2の実施例の構成を示す図である。FIG. 2 is a diagram showing a configuration of a second exemplary embodiment of the present invention.
【図3】本発明の第3の実施例の構成を示す図である。FIG. 3 is a diagram showing a configuration of a third exemplary embodiment of the present invention.
【図4】本発明の第4の実施例の構成を示す図である。FIG. 4 is a diagram showing a configuration of a fourth exemplary embodiment of the present invention.
【図5】本発明による測定回路の一例を示す図である。FIG. 5 is a diagram showing an example of a measuring circuit according to the present invention.
【図6】図5に示された各部の信号波形を示した図であ
る。FIG. 6 is a diagram showing signal waveforms of respective parts shown in FIG.
【図7】従来のケーブルの一例を示す図である。FIG. 7 is a diagram showing an example of a conventional cable.
1 ボーリング孔 2 モルタル 10 感圧ケーブル 11 中心導体 12,21,31,41 抵抗層 13 スペーサ 14 金属管 15 シース 22 線状体 1 boring hole 2 mortar 10 Pressure-sensitive cable 11 center conductor 12, 21, 31, 41 Resistance layer 13 Spacer 14 metal tubes 15 sheath 22 linear objects
フロントページの続き (58)調査した分野(Int.Cl.7,DB名) G01L 1/20 Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) G01L 1/20
Claims (3)
層の外側に絶縁体よりなるスペーサを間隔をおいて配置
し、該スペーサの外側に金属管を配置し、該金属管の外
側に絶縁シースを施し、前記抵抗層を、前記中心導体の
周囲に導電性塗料を塗布して形成したことを特徴とする
感圧ケーブル。1. A resistance layer is provided around a central conductor, spacers made of an insulating material are arranged outside the resistance layer at intervals, a metal pipe is arranged outside the spacer, and a metal pipe is arranged outside the metal pipe. An insulating sheath is applied to the
A pressure-sensitive cable characterized by being formed by applying a conductive paint to the surrounding area .
ング状の絶縁体を長さ方向に間隔をおいて配置して形成
したことを特徴とする請求項1記載の感圧ケーブル。2. The spacer is attached to the outside of the resistance layer.
Formed with ring-shaped insulators at intervals in the length direction
The pressure-sensitive cable according to claim 1, wherein the pressure-sensitive cable is formed.
縁体による線状体を螺旋状に巻き付けて形成したことを
特徴とする請求項1記載の感圧ケーブル。3. The spacer is provided outside the resistance layer.
The pressure-sensitive cable according to claim 1, wherein the linear body formed of an edge body is spirally wound and formed .
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07290295A JP3500515B2 (en) | 1995-03-30 | 1995-03-30 | Pressure sensitive cable |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP07290295A JP3500515B2 (en) | 1995-03-30 | 1995-03-30 | Pressure sensitive cable |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH08271356A JPH08271356A (en) | 1996-10-18 |
JP3500515B2 true JP3500515B2 (en) | 2004-02-23 |
Family
ID=13502750
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP07290295A Expired - Fee Related JP3500515B2 (en) | 1995-03-30 | 1995-03-30 | Pressure sensitive cable |
Country Status (1)
Country | Link |
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JP (1) | JP3500515B2 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11258011A (en) * | 1998-03-10 | 1999-09-24 | Reideikku:Kk | Slant face collapse detecting system |
KR100917541B1 (en) * | 2008-01-10 | 2009-09-16 | 이시우 | Wiring switch structure and production method |
CN110904983B (en) * | 2019-12-11 | 2020-06-19 | 冯翠娟 | Highway side slope reinforcing apparatus |
CN117980752A (en) * | 2021-10-06 | 2024-05-03 | 株式会社自动网络技术研究所 | Wire inspection system, wire inspection method, and wire |
-
1995
- 1995-03-30 JP JP07290295A patent/JP3500515B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
JPH08271356A (en) | 1996-10-18 |
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