JPH10160854A - Electric wire used for detecting conduit tube and method and device for detecting conduit tube using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely detect a conduit tube by connecting solenoid winding of a certain winding width at one end of linear conductor, repeating a similar connection of coil in reverse direction with the same winding width and making other linear conductor a return path. SOLUTION: A coil cable 8 is produced by connecting a solenoid winding of a certain winding width at one end of linear conductor, connecting a solenoid winding in reverse direction with the same winding width and repeating similar connection for other linear conductor in turn as a return path. In a conduit 6 between rebers 1 and 2, the coil cable 8 is inserted to the middle and high frequency current of an oscillator 9 is sent. A conduit detector 10 is placed on concrete 5, a coil cable current magnetic field is detected with an air-core coil 11 in it, the output is sent via an amplifier 12 to a signal component extractor 13 and a direct current voltage proportional to the magnetic field is output. This is indicated with a volt meter 14 and it turns on a yellow lamp 16 using a comparator 15 at a specified voltage and turns on a red lamp 18 using a comparator 17 at a higher voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conduit for accommodating a signal line for transmitting information important for business functions in a reinforcing bar or the like in concrete for maintaining the strength of a concrete building. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conduit tube detecting device for detecting only conduits and avoiding them in order to prevent the conduits from being broken by mistake during repair work.

[0002]

2. Description of the Related Art Extending the service life of existing buildings by repairing or renovating them increases the costs of dismantling and rebuilding,
At present, it is extremely difficult to process residual materials,
% Of buildings are being renovated without dismantling. At the time of renovation, the functions of the building are dramatically improved by adding a cooling / heating function, a telephone call, and a communication function. It is indispensable to make holes in concrete floors or walls during such repair work, and when performing such work, cut off the conduit containing the communication lines, such as computers, and destroy the communication function. Has a very serious negative effect on society. In addition, during the construction, if the power line, the power line for lighting, etc. is short-circuited by mistake, the main breaker will fall, the computer connected to it will go down, or in a room without windows, It becomes dark. Therefore, it is desired to detect only the conduit so as not to destroy the conduit that is important for business functions, regardless of the reinforcing steel in the concrete for maintaining the strength of the building.

Conventionally, an X-ray system, a γ-ray system, an ultrasonic system, a radar system, a static magnetic field system, an induction magnetic field system and the like have been proposed for detecting a conduit tube.

However, each of these methods has its own drawbacks. In other words, the X-ray method uses X
If the x-ray film must be set and the location is outside a high-rise building, setting the x-ray film can be enormous. Also, in the case of a conduit made of plastic, a clear image cannot be expected, and an enormous cost is required to investigate over a large area. The same applies to the γ-ray method. In the ultrasonic method, it is necessary to take measures to attenuate the ultrasonic wave, such as painting vaseline between the probe and the wall surface, and it is difficult to decode the waveform of the echo. The radar method also detects reinforcing bars for concrete reinforcement, and it is difficult to decipher the waveform of the echo. The static magnetic field method detects a reinforcing bar for concrete reinforcement similarly to the radar method, and is difficult to distinguish from a conduit.
Also, if the conduit is non-metallic or non-ferromagnetic, it cannot be detected at all. The induction magnetic field method detects a reinforcing bar for concrete reinforcement and cannot detect only a conduit.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks, without breaking existing concrete, and being easy to handle and excellent in portability. It is an object of the present invention to provide a conduit tube detecting device capable of reliably detecting a conduit tube.

[0006]

In order to solve the above-mentioned object, a conduit tube detecting device according to the present invention inserts a coiled electric wire from one end of a conductive or non-conductive conduit tube and energizes the same. An electric conduit detection method and apparatus, wherein an electric conduit is detected by detecting a coiled electric field generated by energization. Here, since concrete is non-magnetic, it has nothing to do with a conduit tube detecting device for detecting a coiled electric wire magnetic field.

FIG. 5 shows a connection state of the coiled electric wires, and FIG. 6 shows a state of a magnetic field generated by energization of the coiled electric wires. Even if two solenoid-shaped coils in the same winding direction are energized while being separated from each other for a certain period, the magnetic field distribution at the terminals near the two solenoid-shaped coils is parallel to the electric wire, and the magnetic field distribution is in the direction perpendicular to the electric wire. Does not occur. On the other hand, in a solenoidal coil in which adjacent coils are wound in opposite directions, a magnetic field in a direction perpendicular to the electric wire is generated from the terminals near two solenoidal coils as shown in FIG. If the magnetic field is in a perpendicular direction, the presence of an energized coiled electric wire can be detected in the same manner as a magnetic field when an electric current is applied to a linear electric wire. Since the magnetic field is more locally concentrated than in the case of Japanese Patent Application No. 8-271346 filed on Sep. 24, 2008, detection with higher sensitivity is possible.
More specifically, the coiled electric wire has a solenoid-shaped first winding having a fixed winding width connected to the end of the linear conductor, and the first winding having an equal winding width in the opposite direction to the first winding. Connect the second solenoidal winding, and further connect a third winding of the same winding width in the opposite direction to the second winding at a position away from the second coil in the same manner,
This is repeatedly and sequentially connected, and another linear conductor is used as a return path for an electric wire. The coiled portion of the wire is inserted into the conduit. This coil-shaped electric wire is supplied as a single wire or as two sets in which the winding portions are shifted from each other while being inserted into the conduit, using a conduit detector that detects a magnetic field generated by the supply of electricity. Is detected.
If one wants to know not only the installation position of the conduit, but also the depth from the wall, the magnetic field obtained by inserting the coiled electric wire having the above configuration from one end of the conduit and energizing the main conduit is used. A detector and at least one auxiliary conduit detector located at a certain distance from the main conduit detector (possibly changing the angle with respect to the conduit)
By comparing the detection output of the main conduit detector with the output of the auxiliary conduit detector, the position on the wall surface of the conduit and the depth therefrom can be confirmed.

When the rebar is magnetized from the lateral direction by the coil-shaped electric current magnetic field, the demagnetizing field coefficient is large.
Very little magnetization. Therefore, the current magnetic field of the coil-shaped electric wire is overwhelmingly large, and the magnetic field due to the magnetization of the rebar is ignored, that is, the rebar is not detected.

When the rebar is partially magnetized in the longitudinal direction, that is, in the longitudinal direction, by the coil-shaped electric current magnetic field, the demagnetizing factor is small and the rebar is magnetized, but its magnetic pole is mainly located at the end of the rebar. As such, they are far from the detector and generate very little magnetic field from the rebar. Therefore, the magnetic field due to the coiled electric wire current is overwhelmingly large, and the lengthwise magnetization of the rebar is ignored. That is, no rebar is detected.

In this manner, a method and an apparatus for detecting a conduit which can detect only a conduit regardless of upper and lower rebars even when sandwiched between ferromagnetic rebars can be provided. In a method in which an induction current is generated by applying a high-frequency magnetic field from the outside and a conduit is detected from the line current, a line current is also generated from a nearby reinforcing bar, so that it is difficult to distinguish the conduit from the conduit as in the radar method.

[0011] The conduit tube detection device has the following basic structure.
An oscillator that inserts a coiled electric wire into a conduit to a required length and conducts electricity to generate a coiled electric wire current magnetic field, and an air-core coil or fluxgate type magnetic field that detects the coiled electric wire current magnetic field Consists of a detector.

In the coil-shaped electric current magnetic field, since a magnetic field is generated radially from the electric wire, the magnetic field detector is opposed to the radiation direction.

When the conduit tube detector is moved parallel to the wall or floor, there is a point where the coil-shaped electric current magnetic field becomes maximum just above the conduit, and when the conduit is further moved, the next maximum point is obtained. Thus, the position of the conduit can be confirmed.

The conduit detector displays a yellow lamp when the conduit detection output reaches a predetermined fixed level, and displays a red lamp when it reaches the maximum level.

As another example, a secondary conduit detector is provided at a certain distance to the left and right of the primary conduit detector, the angle of the secondary conduit detector is changed, and the detection output of the secondary conduit detector is maximized. The depth of the conduit can be known from the wall or floor from the angle at which the angle has changed and the distance from the main conduit detector.

The detector level may be notified by a buzzer sound.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a structural view of a concrete floor detected by using the method and apparatus for detecting a conduit according to the present invention, wherein FIG. 1 (a) is a vertical sectional view, and FIG. Is a plan view. The arranged reinforcing bars 1 and 2 are supported by steel spacers 3 and 4, respectively, and are left in the concrete 5 after the concrete 5 is hardened. The electric conduit 6 may be installed in the middle of the reinforcing bars 1 and 2 in the arrangement, or may be installed on the reinforcing bar 2 like the electric conduit 7. In any state of the conduit, the conduit detecting device according to the present invention includes:
These conduits are surely detected.

FIG. 2 shows the configuration of an embodiment of the conduit tube detecting device. In the figure, reinforcing bars 1 and 2
Between them, there is an electric conduit 6, and the coiled electric wire 8 is inserted partway into the electric conduit 6, and a high-frequency current flows from the oscillator 9. A conduit detector 10 is placed on the surface of the concrete 5, and the conduit detector 10 includes an air-core coil 11 for detecting a coil-shaped electric current magnetic field. The detection output of the air-core coil 11 is connected to the amplifier 12.
The amplifier 12 is connected to the conduit detector 1 by the signal component extractor 13.
0 outputs a DC voltage proportional to the magnitude of the detected coil-shaped electric wire current magnetic field. The output voltage is displayed on a digital or analog voltmeter 14, and when a predetermined voltage is reached by a comparator 15, the yellow lamp 1
6 is turned on, and when a higher voltage level is reached, the red lamp 18 is turned on via the comparator 17.

When the conduit tube detecting device 10 is moved back and forth on the wall or floor in parallel to the wall or floor, and a conduit tube 6 is detected, the voltage is more slowly increased in the vicinity thereof. Search for a position where Assuming that the position is the position shown in FIG. 3A, the position of the conduit is just below the intersection of the red line 19 between "A" and "A". In the same manner, the position where the voltage is maximum is searched around, and the direction connecting the position and the intersection of “A” and “A” is the direction of the conduit. FIG. 3B is a diagram in which the direction of the vertical line of the red line 19 of the conduit tube detecting device 10 is made coincident with the intersection of “A” and “A”.
Here, a fluxgate type detector is used as the detector 20, because the magnetic field received by the fluxgate type detector 20 in this direction becomes maximum.

FIG. 4 illustrates another conduit tube detection device. In the figure, a fluxgate type main conduit detector 20 is shown.
At a fixed distance from −1, fluxgate type secondary conduit tube detectors 21 and 22 are prepared. The angle of the flux gate type auxiliary conduit detectors 21 and 22 can be freely changed by pulse motors 23 and 24 having a speed reducer.
Main conduit detector 20-1 and auxiliary conduit detectors 21, 22
Respectively, when a certain detection level is reached, respectively, the yellow lamps 25, 26 and 27 are turned on. The auxiliary conduit detectors 21 and 22 are set at the same horizontal position as the main conduit detector 20-1, and are moved in parallel to the wall surface on which the conduit detector is measured to output the output of the main conduit detector 20-1. Finds the largest position. Immediately below the intersection of the red line "A" (line 19) and "I" is the position of the conduit. Further, the conduit detector is moved around the position to find a position where the output of the main conduit detector 20-1 is maximized, and the intersection of "a" and "a" of the red line 19 of the previous measurement is determined. The conduit detector is rotated so as to be on the "A" line of the red line 19 of the conduit detector after the movement. At that position, pulse motors 23, 24 with speed reducers
To automatically rotate the auxiliary conduit detectors 21 and 22 to a position where the output of the auxiliary conduit detectors 21 and 22 becomes maximum, and automatically stop at the maximum position. The rotation angle is displayed on the angle indicators 29 and 30 of the auxiliary conduit detectors 21 and 22 of the display 28. When the indications of the angle indicators 29 and 30 have the same angle due to different polarities, the position of the conduit is immediately below the main conduit detector 20-1 and its direction is indicated by the red line 19 In the direction. At this time, the depth of the conduit is determined by the angle indicator 2 of the auxiliary conduit detectors 21 and 22.
9 and 30 and the auxiliary conduit detectors 21 and 22
Is calculated from the distance from the main conduit detector 20-1 by a simple geometric calculation, and the depth of the conduit can be accurately known. It is clear that in principle, only one auxiliary conduit detector may be used, but accuracy can be expected by using two auxiliary conduit detectors. According to the method of energizing one set of solenoidal windings like the coiled electric wire of the present invention, the detection voltage becomes zero immediately above the solenoidal windings, but another set of solenoidal windings that are stranded is used. By arranging the windings so that the windings come between the windings, and by applying current alternately, the detection signal component can obtain a detection voltage immediately above any solenoidal winding.

As described above, when the present conduit tube detecting device is used, in conducting a preliminary inspection of a conduit in a large opening such as an opening of a duct of an air conditioner or an addition of an entrance / exit, an electric wire follows a line to be opened. The tube detector can be moved and operated, and there is no need to inspect the entire surface. Further, it is only necessary to insert the coiled electric wire from one side, and it is an extremely simple and reliable conduit tube detector.

[0022]

As described above, according to the present invention,
It is easy to handle and has excellent portability without breaking the wall surface, and can reliably detect only the conduit.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a concrete wall surface according to the present invention.

FIG. 2 is an embodiment of a conduit tube detector.

FIG. 3 is an embodiment in which a conduit detector is used.

FIG. 4 is an embodiment for detecting the depth of a conduit.

FIG. 5 is an explanatory view of a coiled electric wire.

FIG. 6 is an explanatory diagram of a magnetic field generated by energizing a coiled electric wire.

[Explanation of symbols]

 1, 2 Reinforcing bar 3, 4 Spacer 5 Concrete 6, 7 Conduit tube 8 Coiled wire 9 Oscillator 10 Conduit tube detector 11 Coil 12 Amplifier 13 Signal component extractor 14 Voltmeter 15, 17 Comparator 16, 18 Lamp 19 Red line 20 Fluxgate detector 21-1 Main conduit detector 21, 22 Secondary conduit detector 23, 24 Pulse motor 28 Display 29, 30 Angle display

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Kunihiko Yoshimi 2-29-29 Heian-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture 1 Inside Keisan Seisakusho Co., Ltd. (72) Inventor Yuji Nozawa 2 Heian-cho, Tsurumi-ku, Yokohama-shi, Kanagawa (72) Inventor: Tomiyo Yamado, 1411, Kashio-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture (72) Inventor: Masanori Tsutsui 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Stock Company Obayashi Gumi Tokyo head office (72) Inventor Yoshitoshi Watanabe 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Gumi Tokyo head office

Claims (5)

[Claims] 1. A solenoid-shaped first winding having a constant winding width is formed at an end of a linear conductor, and the first winding is opposite to the first winding close to the other end of the first winding. Connect the second solenoid-shaped winding of the same winding width in the direction, and further connect the third winding of the same winding width in the opposite direction to the second winding at a position away from the second coil in the same manner. A coil-shaped electric wire, which is repeatedly and sequentially connected, and finally made for another electric wire using another linear conductor as a return path. 2. A conduit tube detecting method for inserting the coiled electric wire according to claim 1 from one end of the conduit tube, detecting a magnetic field generated by energization, and thereby detecting a position of the conduit tube. 3. The coiled electric wire according to claim 1,
A conduit tube detecting device for detecting the position of a conduit, comprising: means for supplying current to the coiled electric wire inserted into the conduit, and a conduit detector for detecting a magnetic field generated by the supply of electric current. 4. The coiled electric wire according to claim 1,
A main conduit detector for detecting a magnetic field obtained by inserting a coiled electric wire from one end of the conduit and energizing the main conduit detector, and at least one auxiliary conduit detector at a position separated from the main conduit detector by a certain distance And a detector for comparing the detection output of the main conduit detector and the output of the auxiliary conduit detector to confirm the position of the conduit. 5. The apparatus according to claim 5, further comprising: means for changing an angle of the auxiliary conduit detector with respect to the conduit, wherein a depth of the conduit is detected from a detection change of the auxiliary conduit detector due to the angle change. The conduit tube detecting device according to claim 4, wherein