JPH1089600A - Device for detecting part damaged by nail in concealed pipe line - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for detecting a part of piping for gas or water which is concealed by a concealing material like a wall plate and is broken by a nail driven from the outside of the material from the outside of the material. SOLUTION: This device has a detecting part 15 which is moved on the surface of a concealing material for concealing a metal pipe line and a detector body 16. The detecting part 15 has a pipe detector 17 for detecting piping and a nail detector 18 for detecting a nail driven in the pipe line side from the outside of the material. The detector body 16 has an information part 20 for informing a relative position of the detecting part 15 to the pipe line by the magnitude of the detecting signal of the pipe detector 17 and judges from the magnitude of the detecting signal of the pipe detector 17 and the detecting signal of the nail detector 18 if a nail might break the pipe line or not and the information part 20 informs the presence of the nail which might break the pipe line.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a ceiling plate for a building,
Concealment for detecting from the outside of the concealed object a location where a pipe line such as gas or water concealed by a floor plate, a wall plate, or the like is damaged by a nail or the like driven from the outside of the concealed object during interior construction work or the like. The present invention relates to a pipe damage detection device.

[0002]

2. Description of the Related Art Conventional ceilings and floorboards of buildings,
Pipes such as gas and water that are concealed by gypsum board or plywood used for wall boards, etc. are driven by nailing machines from the surface of concealment materials such as boards or plywood during interior work after piping etc. It may be damaged by nails and the like. On the other hand, in recent years, flexible metal pipe materials commonly called flexible pipes have been frequently used for indoor pipes as described above. The strength is lower than that of steel pipes, and nails driven by a nailing machine or the like penetrate relatively easily.

[0003] When a damage accident such as the penetration of a nail or the like into the concealed pipe line occurs as described above, it is usually found by gas leak or water leak generated at the time of completion inspection or by pressure test of the pipe line. Even in the situation where pressure fluid is not supplied in the pipeline, there is no inspection technology that can identify the damage point by the nail etc. of the pipeline from the outside of the concealment, and the head of the nail etc. Normally, it is completely concealed by painting or cloth-finishing, so that even if an approximate damage is found, it is difficult even to visually identify the penetrating nail for the pipe line from the outside of the concealment.

[0006] Only a few studies have been conducted in which a fiberscope, a television camera, or the like is inserted into the pipe, and a human observes and judges the obtained image. These methods require construction work such as disconnection and connection of pipes, so work cannot be done without qualified personnel.In addition, when the pipe diameter is not large enough, or in the pipes, there are branch points and bends with small curvatures. In some cases, there is a problem that the smooth passage of the inspection equipment cannot be guaranteed. Therefore, the applicable range is limited, the equipment is expensive, and the equipment is not in a practical use at present.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a concealed pipe passage penetrating nail detecting device which can solve the above-mentioned conventional problems. When shown with a reference numeral of the form, the detection unit 15 includes a detection unit 15 movable on the surface of a concealing material 54 that conceals the metal pipe passage 50, and a detector main body 16, and the detection unit 15 includes:
It has a pipe detector 17 for detecting the pipe 50 and a nail detector 18 for detecting a nail or the like driven into the pipe 50 from the concealing material 54.
0, the notifying unit 20 notifies the relative position of the detection unit 15 with respect to the pipe line 50 from the magnitude of the detection signal of the tube detector 17, and the magnitude of the detection signal of the tube detector 17. And the presence or absence of a nail or the like that may damage the piping 50 based on the detection signal of the nail detector 18 and the presence of the nail or the like that may damage the piping 50. The notification is made in the unit 20.

A method of detecting the position of the concealed metal pipe line 50 from outside the concealing material 54 by the tube detector 17 is as follows.
For example, an alternating current is passed through the pipe in advance, a magnetic field generated by the alternating current is detected by a detection coil, and the position of the pipe and the pipe concealment depth are determined from the magnitude of the detection signal (induced current). Method is available,
In order to detect nails or the like hidden by the surface finishing material 55b of the concealing material 54 with the nail detector 18, metal detection used for residual inspection of sewing needles of clothing and bedding and foreign substance detection inspection in processed foods is performed. The technique of the container, that is, the technique utilizing the fact that the self-inductance of the coil changes when a metal body is brought close to the coil can be used.

In the apparatus of the present invention having the above-described structure, the detecting unit 15 is moved on the surface of the pipe concealing material 54 to perform a sweeping search of the pipe 50, and the notifying unit 20 informs the pipe 50 of the notification. Based on the relative position of the detection unit 15,
The detection unit 15 can be moved directly above the pipe line 50. In such a state, the detector main body 16 determines the presence or absence of a nail or the like that may damage the pipe passage 50 based on the magnitude of the detection signal of the pipe detector 17 and the detection signal of the nail detector 18. If there is a corresponding nail or the like, the notifying unit 20 notifies the user of the nail, and the operator can use this notification to allow the nail or the like in the detection area of the detecting unit 15 (the nail detector 18) at that time to move the pipe 50. You can know what might have been damaged.

In implementing the above-described apparatus of the present invention,
As described above, the transmitter 1 that supplies an alternating current between both ends of the pipe line 50 in the exploration area is used together, and the tube detector 17 of the detection unit 15 detects the magnetic field generated around the pipe line 50. In general, a magnetic detection coil for detection is used, but at this time, a transmitter that can be adjusted according to the length of the nail to be detected (the concealing depth of the pipe passage 50) is used as the transmitter 1. It is desirable.

The size of the detection signal of the pipe detector 17 when the detector 15 is located directly above the pipe line 50 is determined by the length of a nail or the like used in the search area. A nail that may damage the pipeline 50 when the pipeline concealing depth from the surface of the concealing material 54 to the pipeline 50 is shallow, and when the nail detector 18 outputs a nail detection signal. By notifying the presence of such as in the notifying unit 20, when the pipe passage concealing depth is deeper than the length of a nail or the like used, the pipe passage 5
Even if a nail or the like is detected at a position overlapping with zero, it is not notified.

A detector 70 having a plurality of tube detectors 74c and 74d is provided at appropriate intervals in the vertical direction, and the detector main body 71 is provided with the plurality of upper and lower tube detectors 74c and 74d.
The pipe line concealment depth is obtained by a comparison operation of the detection signals of d,
The pipe line 50 is damaged when the obtained pipe line concealing depth is shallower than the set value corresponding to the length of the nail or the like used in the exploration area and the nail detector outputs a nail detection signal. By configuring the notification unit 73 to notify the presence of a nail or the like that may be caused, detection with even higher accuracy is possible.

Further, a pair of right and left tube detectors 74a and 74b are provided.
Is provided, and the detector main body 71 notifies the relative position of the detector 70 with respect to the pipe line 50 based on a comparison operation result of the detection signals of the pair of left and right pipe detectors 74a and 74b. , It is possible to move the detecting unit 70 along the route of the pipe line 50 with high accuracy. Further, the adjustment of the output current of the oscillator 1 becomes unnecessary.

A plurality of nail detectors 75a and 75b having different widths of the nail detection area are arranged in front and rear on the center line of the detection unit 70, and the main body 71 of the detector is adapted to the diameter of the pipe 50 in the search area. Accordingly, by selectively using the detection signals of the plurality of nail detectors 75a and 75b, it is possible to accurately cope with a large change in the diameter of the pipe line,
It is possible to accurately detect a nail or the like that may damage the pipeline 50.

In any case, the detector main bodies 16, 71 are
A criterion for determining the presence of a nail or the like that may damage the pipe line 50 based on the magnitude of the detection signal of the pipe detector 17, 74a to 74d and the detection signal of the nail detector 18, 75a, 75b. It is desirable that the value be adjustable. Further, the detector main body 71 is provided with input means 84 so that the determination reference value is automatically adjusted based on the length of the nail or the like or the pipe passage concealing depth input by the input means 84. Can also.

Further, a contact needle 46 for contacting the head of a nail or the like and a notifying means 44 for measuring and notifying the electric resistance between the contact needle 46 and the pipe 50 are provided. Based on the electric resistance between the nail or the like and the pipe 50 detected as described above, whether the nail or the like penetrates the pipe 50 or the pipe 5
It can be configured such that it is possible to determine whether contact damage has been given to 0 or if it is away from the pipe line 50.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the detecting apparatus of the present invention comprises a transmitter 1, a detector 2, It comprises a contact resistance measuring device 3. As shown in FIG. 2, the oscillator 1 includes an oscillating circuit 5 for an AC signal, an output current adjusting circuit 6, a manual output current adjuster 7 of the output current adjusting circuit 6, and an output for amplifying the output current to a required level. Amplifying circuit 8, power supply circuit 9 for supplying a power supply current to each of these circuits, output ammeter 10, and output terminals 11a and 11b
The output current adjuster 7 can be manually adjusted based on the display of the output ammeter 10 to output a signal current of a constant level. Of course, a constant current circuit can be used instead of the manual output current adjusting means for automation.

As shown in FIGS. 1B and 3, the detector 2 includes a detector 15 and a detector main body 16. The detector 15 includes a tube detector (magnetic detection coil) 17 and a nail detector. (Magnetic detection coil) 18 and the detector body 16
Is composed of a signal processing unit 19 and a notification unit 20. The signal processing unit 19 includes the tube detector 17 of the detection unit 15.
Amplifier circuit 2 connected to connection line 21 through connection cord 21
2, filter circuit 23, second amplifier circuit 24, meter display circuit 25, first determination circuit 26, second determination circuit 27,
A self-excited oscillation circuit 29, a third discrimination circuit 30, and a power supply circuit 31 for supplying a power supply current to each of these circuits are connected to the nail detector (magnetic detection coil) 18 of the detection unit 15 via a connection cord 28. It is configured. The notification unit 20
Is a meter 32 connected to the meter display circuit 25,
An indicator light 33 and a speaker 34 connected to the second determination circuit 27 and an indicator light 35 connected to the third determination circuit 30 are provided.

As shown in FIGS. 1C and 4, the contact resistance measuring device 3 includes an oscillating circuit 40 for generating an AC signal, an amplifying circuit 41 for amplifying an output signal of the oscillating circuit 40 to a certain level, and an amplifying circuit 41. Output from the connection line 42a,
A current detection circuit 43 that supplies a current to the current supply circuit 42b and detects a current flowing therethrough; a meter 44 that displays a resistance value calculated from the current value detected by the current detection circuit 43 and the voltage value of the amplifier circuit 41; The power supply circuit 45 supplies a power supply current to each circuit. As shown in FIG. 1C, a contact needle 46 is attached to the connection line 42a, and a clip 47 for connection to a pipeline is attached to the connection line 42b. I have.

FIGS. 5 and 6 show a metal indoor pipeway 50 and nails 51a and 51b to be detected. The indoor pipeway 50 is fixed to a structural member 52 such as a stud by a pipe fixing bracket 53 and is concealed by a concealing material 54. This concealing material 54 is a concealing material main body 55 such as a gypsum board or a plywood.
a and a finishing material 55b such as a paint film or cloth for decorating the surface thereof, and the nails 51a and 51b
Before finishing the concealing material main body 55a in FIG.
It is driven into 5a. The illustrated nail 51a is, for example, a nail that has been accidentally driven into a position penetrating the pipe line 50,
b illustrates a nail driven away from the pipeline 50.

When the indoor pipeline 50 is a gas pipeline, a gas meter 56 is connected to one end of the indoor pipeline 50 and a gas cock 57 is connected to the other end of the indoor pipeline 1 as shown in FIG. These gas meters 56
In the gas cock 57, both ends of the indoor piping passage 50 are exposed.

Next, the method of use and operation of the detecting device having the structure shown in FIGS. 1 to 4 will be described. As shown in FIG. 7, a connecting line 60 connected to the output terminals 11a and 11b of the transmitter 1 is used.
When a and 60b are connected to both ends of the exploration area of the indoor pipeline 50, that is, the gas meter 56 and the gas cock 57, and the power supply circuit 9 is closed to supply power to each circuit, each circuit operates and the output amplification is performed. From the circuit 8 to the output ammeter 10 → connection line 60a → gas meter 56 → pipe line 50 → gas cock 5
7 → connection line 60 b → output amplifier circuit 8 and a closed circuit through which a signal current flows is formed, and a magnetic field having a strength corresponding to the signal current is generated around piping 50. At this time, the user operates the output current regulator 7 while watching the display of the output ammeter 10 so as to adjust so that a predetermined current flows according to the length of the nail 51a to be detected. In such a state, the detection section 15 of the detector 2 is slid and moved on the surface of the pipe concealing material 54 to perform a sweeping search of the pipe 50.

That is, as shown in FIGS. 5 and 6, a tube detector (magnetic detection coil) 17 and a nail detector 18 of the detection unit 15 are provided.
Means that the pipe detector 17 of the detector 15 is generated around the pipe 50 on the surface of the pipe concealing material 54 in the vicinity of the sliding bottom surface of the detector 15. When in the magnetic field, the tube detector (magnetic detection coil) 17
, An induced current (detection signal) flows. The weak detection signal of this tube detector 17 is amplified by the first amplifier circuit 22 in the signal processing unit 19 of the detector main body 16 shown in FIG. 3, and after the noise component is removed by the next filter circuit 23, The signal is further amplified to a required level by the two amplifier circuit 24. The AC signal is converted to a DC signal by the meter display circuit 25, and the level is displayed on the meter 32 of the notification unit 20. The deflection of the meter 32 at this time indicates the depth of the pipe 50 from the surface of the pipe concealing material 54 (hereinafter referred to as the pipe concealing depth).

The output of the second amplifying circuit 24 is input to a first discriminating circuit 26, which discriminates whether or not the output is higher than a set level. That is, if the signal current flowing through the pipe 50 is constant, the output of the second amplifier circuit 24 is inversely proportional to the distance between the pipe 50 and the pipe detector 17, ie, inversely proportional to the pipe concealment depth. On the other hand, the nail that is driven into the pipe concealing material 54 penetrates the pipe 50 because the length of the nail is longer than the pipe concealing depth. The pipe detector 1 is located directly above the pipe line 50 where the pipe line concealing depth is shallower than the length of the pipe line (which can be known in advance).
The determination criterion (threshold) of the first determination circuit 26 so that an output is generated from the first determination circuit 26 when the position 7 is located.
May be set according to the length of the nail to be detected (length of the nail to be detected). Thus, the output of the first determination means 26 is input to the second determination circuit 27.

The setting and changing of the criterion (threshold) corresponding to the length of the nail to be detected in the first determining circuit 26 is performed by the output current regulator 7 of the transmitter 1 as described above. Makes the output of the transmitter 1 constant, and the first and second amplifier circuits 22 and 2 in the signal processing unit 19 of the detector main body 16.
4 may be manually changed.
Of course, the determination criterion (threshold) of the first determination circuit 26 may be directly changed.

The self-excited oscillation circuit 29 uses the nail detector (magnetic detection coil) 18 of the detection section 15 connected via a connection cord 28 as an oscillation element. ) The transmission frequency and level change due to the change in the self-inductance of 18. The self-inductance changes greatly when a magnetic material such as a nail approaches the nail detector 18, and the distance between the two and the change in the self-inductance change. Since the relationship greatly changes exponentially, it is possible to take out only the change caused by the nail without being affected by the piping 50 that is far away. The change is discriminated by the third discriminating circuit 30, and if there is a change equal to or more than a certain value (change in the level due to the nail), the indicator light 35 is turned on and the output is input to the second discriminating circuit 27.

The second discriminating circuit 27 outputs an indicator light 33 when both the first discriminating circuit 26 and the third discriminating circuit 30 have an output.
Is turned on, and the speaker 34 is sounded.

Therefore, the surface of the pipe concealing material 54 is swept by the detector 15 and the position of the pipe detector 17 when the deflection of the meter 32 is maximized is determined.
By moving the detection unit 15 so that the deflection of the meter 32 maintains the maximum value, the route of the pipeline 50 can be determined from the movement locus. I do. At this time, by moving the detection unit 15 in a direction parallel to the tube detector 17 and the nail detector 18, the nail 51a is located in the nail detection area of the nail detector 18, that is, at a position overlapping with the pipe line 50 or a position near the same. ,
When 51b is present, the indicator light 35 is turned on by the above operation, and if the pipe passage concealing depth is equal to or less than the reference set by the first determination circuit 26, the indicator light 33 is turned on and the speaker 34 is sounded. From the lighting of the indicator light 33 and the sounding of the speaker 34, the nail 51a or 51b in the detection area of the nail detector 18 at that time penetrates or comes into contact with the pipe line 50 directly below the pipe detector 17. You may know that you may have been damaged.

When the above situation is found, the actual degree of damage is measured using the contact resistance measuring device 3. That is, the connection wire 4 is connected using the connection clip 47 of the contact resistance measuring device 3.
2b is connected to a gas cock 57 or a gas meter 56, and in a state where the power supply circuit 45 is closed, the nail 51 at a position on or near the pipe line discovered by the sweeping search
The electric resistance between the head of a or 51b and the piping 50 is measured. Specifically, as shown in FIG. 8, a contact needle 46 made of a conductive material such as metal and having a needle-like tip is pierced from the surface of the concealing material 54 into the detection area of the nail detector 18. Then, the tip of the contact needle 46 is brought into contact with the head of the nail 51a or 51b.

If the nail in contact with the contact needle 46 is
a, the current detection circuit 43 of the contact resistance measuring instrument 3 → the connection line 42b → the pipe line 50 → the nail → the contact needle 46 → connection line 42a → a closed circuit of the current detection circuit 43 is formed and current flows, and the contact resistance value between the pipe line 50 and the nail at this time can be read by the meter 44, so that the contact resistance value is low. If the detected nail is in the pipeline 5
0 is completely penetrated or close to 0, it can be determined that the possibility of damage is large, and if the contact resistance value is high, the possibility of damage to the pipe line 50 due to the detected nail is high. It can be determined that it is low or completely separated. Of course, if the nail 51b is within the detection area of the nail detector 18 but is completely separated from the pipe line 50, the contact needle 46 is brought into contact with the head of the nail 51b. Since the contact resistance value that can be measured at this time is substantially infinite, it can be determined that the nail 51b is separated from the pipe line 50.

The contact resistance between the pipe 50 and the nail is read by the meter 44. However, a predetermined reference value is set, and a determination circuit for comparing and determining the contact resistance with the reference value is provided. In combination, an indication lamp or a speaker may notify when the contact resistance value is equal to or less than the reference value. As shown in FIG. 9, the nail detector (magnetic detection coil) 18 in the detection unit 15 is formed in a ring shape, and the center portion thereof is provided so that the contact needle 46 of the contact resistance measurement device 39 can be moved up and down. Thus, the operation of contacting the contact needle 46 with the head of the nail detected by the nail detector 18 can be performed easily and quickly.

Further, in the above-described embodiment, as shown in FIG. 1, the detecting device comprises a transmitter 1, a detector 2, and a contact resistance measuring device 3 which are separated and independent from each other.
Detector body 1 composed of signal processing unit 19 and notification unit 20
6 and the detection unit 15, but the hardware configuration is not limited to this, and all may be integrated or may be integrated in any combination. For example, the transmitter 1, the detector main body 16, and the contact resistance measuring device 3 are integrated, the notification unit 20 of the detector main body 16 is integrated with the detection unit 15, and the notification unit 20 of the detector main body 16 is further integrated. The contact needle 46 of the contact resistance measuring device 3 can be integrated with the integrated detection unit 15 as described above.

Next, a second embodiment of the detector 2 will be described with reference to FIGS. The detector 2 according to the second embodiment is divided into a detection unit 70 and a detector main body 71, and the detector main body 71 includes a signal processing unit 72 and a notification unit 73.
It is composed of The detector 70 is provided with four tube detectors 74a to 74d and two nail detectors 75a and 75b.

As shown in FIG. 11, the tube detectors 74a to 74a-7
4d, two tube detectors 74a and 74b formed of magnetic detection coils of the same specification are arranged on a plane parallel to the bottom surface of the detection unit 70 which is in sliding contact with the surface of the pipe passage concealing material 54 and the detection unit 7
The other two tube detectors 74c, 7 which are arranged side by side with respect to the center line of 0 and are made of magnetic detection coils of the same specification.
4d is disposed at an appropriate interval above and below the center line of the detection unit 70 so that the lower tube detector 74c is located on the same plane as the two tube detectors 74a and 74b. .

Two nail detectors (magnetic detection coils) 75
a and 75b are arranged in front and rear on the center line of the detection unit 70, and one nail detector 75a is a nail detector for a large-diameter pipe having a large nail detection area, and the other nail detector 75 is used.
b is a nail detector for small-diameter pipes having a small width of the nail detection area.

The signal processing section 72 includes a first amplifier circuit 77a to 77d, a filter circuit 78a to 78d, and a first amplifier circuit 77a to 77d respectively connected to the tube detectors 74a to 74d of the detection section 70 via connection lines 76a to 76d. Two amplifier circuits 79a to 79
d, each nail detector 75a, 75b of the detection unit 70 and the connection line 8
Self-excited oscillation circuits 8 connected separately through the circuits 0a and 80b
Each analog output of 1a, 81b, amplifier circuits 82a, 82b, second amplifier circuits 79a-79d for each tube detector and amplifier circuits 82a, 82b for each nail detector is digitally converted by a built-in A / D converter. A microprocessor 83 for performing predetermined arithmetic processing; input means (such as a keyboard) for the microprocessor 83;
4 and a power supply circuit 85 for supplying power to each component. The notification unit 73 includes a display lamp 86, a character display panel 87 such as a liquid crystal display, and a speaker 88 connected to the microcomputer 83 via an appropriate interface.

The first amplifying circuits 77a to 77d and the filter circuit 78 are respectively connected to the tube detectors 74a to 74d.
a to 78d and the second amplifier circuits 79a to 79d are the same as the first amplifier circuit 22, the filter circuit 23, and the second amplifier circuit 24 shown in the above embodiment, and perform the same operation. Further, the self-excited oscillation circuits 81a and 81b respectively connected to the nail detectors 75a and 75b perform the same operation as the self-excited oscillation circuit 29 shown in the previous embodiment.

According to the detector 2 having the above configuration, the detecting unit 70
Are above the pipeline 50, the four magnetic field detectors 74a-74 are generated by the magnetic field generated around the pipeline 50.
d, a detection signal (induced current) is induced, but at the time of a sweeping search by the detection unit 70, a pair of left and right tube detectors 74a, 74
The detection signal of b is compared by the microprocessor 83, and when the difference between the magnitudes of the detection signals of the pair of right and left tube detectors 74a and 74b becomes zero or within an allowable range, the center line of the detection unit 70 is set to the pipe line. Since it is located almost directly above 50, this can be notified by at least one of the indicator lamp 86, the character display panel 87, and the speaker 88 of the notification unit 73. The detection unit 7 is designed to maintain this state.
By moving 0, the route of the pipeline 50 can be known.

On the other hand, a pair of upper and lower tube detectors 74c and 74d
Since the interval between them and the interval between the lower pipe detector 74c and the surface of the pipe passage concealing material 54 are known conditions, the center line of the detection unit 70 is located almost directly above the pipe path 50 as described above. When it is located, the vertical distance from the surface of the pipe concealing material 54 to the pipe 50 by the microprocessor 83 (pipe concealing depth) from the magnitude of each detection signal of the pair of upper and lower pipe detectors 74c and 74d. Can be calculated, and
From the magnitude of the detection signal of the pair of left and right tube detectors 74a and 74b, the microprocessor 83 can calculate the horizontal displacement of the pipe line 50 with respect to the position immediately below the detection unit 70 by the microprocessor 83. Detector 74
c, 74d and the detection signals of the pair of left and right tube detectors 74a, 74b,
Can be detected with high accuracy.

The pair of front and rear nail detectors 75a and 75b have a large nail detection area in the case of a large-diameter pipe according to the width (pipe diameter) of the pipe 50 input from the input means 84. The detection output of 75a is taken in, and in the case of a small diameter tube, the detection output of the nail detector 75b having a small width of the nail detection area is taken. Of course, the same applies to the previous embodiment, but the self-excited oscillation circuits 81a, 8b are provided for a change in the pipe diameter to the extent that there is no need to switch the nail detectors 75a, 75b.
1b and switching of the discrimination reference value (threshold) by the microprocessor 83 (switching of the discrimination reference value (threshold) of the third discrimination circuit 30 in the above embodiment). . When a plurality of nail detectors having different widths of the nail detection area are selectively used, the number thereof may be increased or decreased according to the applicable range.

From the input means 84, the length of the nail specified for the search area is input. Microprocessor 8
3 is the input nail length, the pipe passage concealment depth determined by the calculation of the detection signal from the detection unit 70 as described above, and the calculation of the detection signal from the detection unit 70 or from the input means 84. Based on the input conditions such as the pipe diameter, the presence or absence of nails that may cause penetration or contact damage to the detected concealed pipeline 50 is calculated, and the indicator lamp 86 of the notification unit 73 is obtained. , A character display panel 87, and a speaker 88.

Also, in the above embodiment, the vertical direction
Although the two tube detectors 74c and 74d are arranged and combined with the pair of left and right tube detectors 74a and 74b, it is possible to arrange three or more tube detectors vertically. Conversely, the detection unit may be configured by a combination of a pair of left and right tube detectors 74a and 74b and one tube detector 74c (or 74d) disposed at the center position. Further, the contact resistance measuring device 3 in the above embodiment can be combined. In this case, the output of the current detection circuit 43 to the meter 44 is
3 and after the arithmetic processing, it can be notified by at least one of the indicator lamp 86, the character display panel 87, and the speaker 88 of the notification unit 73.

Although a gas pipe is used as the detected pipe, other pipes such as a water pipe can be similarly detected. In addition, although a magnetic detection coil was used for the tube detector and the nail detector, a method of electromagnetically detecting these pipes, nails, and the like was used. Other detection methods can be employed. Of course,
The detection target of the nail detector is not only general nails driven from the outside of the pipe line concealment due to interior construction work, but also screw type such as wood screw and coach screw, and bifurcated shape called stapler Also includes nails.

[0042]

As described in the above embodiment, according to the apparatus for detecting a damaged portion of a concealed pipeline by a nail or the like according to the present invention, the detection section is connected to the pipe section in accordance with the notification content of the notification section of the detector main body. Just by moving along the upper position, the presence of a nail or the like that may damage the piping path is notified by the notification unit. In other words, it is possible to easily detect a nail or the like that may damage the pipe line hidden inside the concealing material from the outside of the concealing material. Therefore,
Before supplying pressure fluid such as gas or tap water to the piping,
It is possible to investigate the possibility of gas leaks and water leakage accidents, and to narrow down the location of nails etc. that may have damaged the pipeline, so that concealment materials can be used during repair work. It is not necessary to peel off the entire surface and re-attach the concealing material again after the repair, and the repair work may be performed on the detected minimum area, so that the economic effect is large.

In the following, the effects of the structure of each claim will be listed. According to the structure of claim 2, a magnetic field is generated around the pipe line in the exploration area, and this magnetic field is detected by the detecting section. The strength of the magnetic field generated around the pipe line can be adjusted according to the length of the nail or the like to be detected (the concealment depth of the pipe line). Even if the length of a nail or the like used in the search area changes, it is possible to accurately detect a nail or the like that may actually damage the pipeline.

According to the third aspect of the present invention, when the pipe passage concealing depth is deeper than the length of the nail or the like used, even if the nail or the like is detected at a position overlapping with the pipe passage, the nail is detected. The notification is not performed, and unnecessary repair work can be eliminated.

According to the configuration of the fourth aspect, it is possible to more accurately detect a nail or the like that may damage the pipe line, and it is not necessary to adjust the output of the oscillator used together. According to the configuration described in 5, the operation of moving the detection unit along the route of the pipeline can be performed with higher accuracy. Further, according to the configuration of the sixth aspect, it is possible to accurately detect a nail or the like which may damage the pipeline by accurately coping with a large change in the diameter of the pipeline to be searched. be able to.

According to the seventh aspect of the present invention, even when the length of a nail or the like used in the exploration area changes, only the nail or the like that may damage the pipe line by adjusting the determination reference value. Can be accurately detected. Claim 8
According to the configuration described in (1), the length of a nail or the like that needs to be detected or the depth of concealing a pipe passage can be input to automatically adjust the determination reference value, so that the practicality is improved.

Further, according to the structure of the ninth aspect,
From the electric resistance between the nail etc. and the pipeline detected as described above, whether the nail etc. penetrates the pipeline,
Alternatively, it is possible to determine whether the pipe has caused contact damage to the pipe, or whether the pipe is away from the pipe, and it is possible to eliminate unnecessary repair work.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of a detection device of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a transmitter.

FIG. 3 is a block diagram illustrating a configuration of a detector.

FIG. 4 is a block diagram illustrating a configuration of a contact resistance measuring device.

FIG. 5 is a partially cutaway plan view showing a piping path, a concealing material, and a detection unit in a use state.

FIG. 6 is a vertical sectional side view of the same.

FIG. 7 is a diagram illustrating how to use the transmitter.

FIG. 8 is a diagram illustrating a method of using a contact resistance measuring device.

FIG. 9 is a longitudinal sectional front view of a main part illustrating a modification of the contact resistance measuring device.

FIG. 10 is a perspective view showing an appearance of a device of the present invention in a second embodiment.

FIG. 11 is a longitudinal sectional front view showing a detection unit in a second embodiment in a used state.

FIG. 12 is a block diagram illustrating a configuration of a detector according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmitter 2 Detector 3 Contact resistance measuring device 15 Detector 16 Detector main body 17 Tube detector (magnetic detecting coil) 18 Nail detector (magnetic detecting coil) 19 Signal processing unit 20 Notification unit 46 Contact of contact resistance measuring device Needle 50 Metal pipeway 51a Nail penetrating the pipeway 51b Nail separated from the pipeway 54 Concealment material 55a Concealment material body 55b such as gypsum board or plywood 55b Finishing material such as paint film or cloth 56 Gas meter 57 Gas cock 70 Detector 71 Detector body 72 Signal processing unit 73 Notification unit 74a to 74d Tube detector (magnetic detection coil) 75a, 75b Nail detector (magnetic detection coil) 83 Microprocessor 84 Input means (keyboard, etc.)

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G08B 21/00 G08B 21/00 A // G01V 3/02 G01V 3/02 A

Claims (9)

[Claims] 1. A detecting unit movable on a surface of a concealing material for concealing a metal pipe line, and a detector main body, wherein the detecting unit detects the pipe line, a pipe detector, and the concealing unit. A nail detector for detecting nails or the like driven into the pipe from the material, wherein the detector main body is provided with a notifying unit, and the detection of the pipe relative to the magnitude of the detection signal of the pipe detector. Notifying the relative position of the section in the notifying section, based on the magnitude of the detection signal of the tube detector and the detection signal of the nail detector, the presence or absence of a nail or the like that may damage the pipe line. A device for detecting a damaged portion of a concealed pipe line by a nail, which discriminates and notifies the presence of a nail or the like that may damage the pipe line in the notifying section. 2. A transmitter for supplying an alternating current between both ends of a pipe line in an exploration area is used in combination. The transmitter has an adjustable output current. 2. The apparatus according to claim 1, further comprising a magnetic coil for detecting a magnetic field generated around the pipeline. 3. The detector main body according to claim 1, wherein a magnitude of a detection signal of the pipe detector when the detector is at a position directly above a pipe line is:
When the pipe line concealing depth from the surface of the concealing material to the pipe line is shallower than the length of the nail etc. used in the exploration area, and when the nail detector outputs a nail detection signal,
The device for detecting a damaged part of a concealed pipeline by a nail according to claim 1 or 2, wherein the notification unit reports the presence of a nail or the like that may damage the pipeline. 4. The detecting section is provided with a plurality of pipe detectors at appropriate intervals in the vertical direction. The detector main body is configured to compare the detection signals of the plurality of upper and lower pipe detectors with each other in the pipe line. When the concealing depth is obtained, and the obtained pipe channel concealing depth is shallower than the set value corresponding to the length of the nail or the like used in the search area, and when the nail detector outputs a nail detection signal. 4. The apparatus according to claim 3, wherein the notifying unit notifies the presence of a nail or the like that may damage the pipeline by the notifying unit. 5. A pair of left and right pipe detectors are provided in the detection section, and the main body of the detector is configured to detect the detection section of the pair of right and left pipe detectors based on a comparison operation result of the detection section. The device for detecting a damaged portion of a concealed pipeline by a nail according to claim 1, wherein the relative position is reported by the reporting unit. 6. A plurality of nail detectors having different widths of a nail detection area are arranged in front and behind on a center line of the detection section in the detection section, and the main body of the detector is provided in a pipe line in an exploration area. 6. The device according to claim 1, wherein the detection signals of the plurality of nail detectors are selectively used in accordance with a diameter of the nail. 7. A detection criterion for judging the presence of a nail or the like that may damage a pipe line based on a magnitude of a detection signal of a pipe detector and a detection signal of a nail detector. 7. The device according to claim 1, wherein the value is adjustable. 8. The detector body according to claim 7, wherein the detector body has an input means, and the determination reference value is automatically adjusted based on a length of the nail or the like or a pipe passage concealing depth input by the input means. Detecting device for damaged parts of nails in concealed pipelines. 9. A contact resistance measuring device for measuring the electric resistance between a contact needle for contacting a head of a nail or the like and the contact needle and a pipe line. 9. A device for detecting a damaged portion of a concealed pipeline by a nail according to any one of claims 1 to 8, further comprising: