JPH0679017B2 - Void probe - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a void probe for determining the peeling state of exterior tiles of a building and the floating state of mortar.

[A] Conventional technology Conventionally, the following investigation technology exists as a method for confirming the peeling state of tiles and the like.

(A) Method of judging by the sound when hit with a hammer etc.

(B) A method of oscillating with ultrasonic waves and analyzing and judging the reflected wave thereof (C) A method of judging infrared rays radiated from an object to be examined by photographing with an infrared camera [B] To solve the present invention There are the following problems in each of the above methods.

(1) In the method of hitting with a hammer, since the judgment of the hitting sound is artificially made, it requires considerable skill to make an accurate judgment, and there is individual difference in the judgment result, and the judgment result is reliable. It is not very popular.

(2) The method using ultrasonic waves requires a large-scale device, and it takes time to determine the reflected waves of ultrasonic waves.

(3) The determination method by infrared imaging must be determined in consideration of environmental conditions such as temperature change around the object to be probed,
Requires specialized knowledge.

Further, it is possible to judge the peeling state as a whole, but it is difficult to judge partially.

(4) Japanese Patent Laid-Open No. 56-652 discloses a device for exploring the cavity of a cast concrete insect.

This device has a structure in which an elastic wave with a natural vibration of concrete is generated by hitting a mold, the frequency of air vibration caused by the elastic wave is measured, and the frequency is compared with the frequency in a normal state (no void).

However, this type of device has the following problems.

・ It takes time to measure and check the frequency, and the measurement result cannot be obtained instantly.

・ The frequency analysis circuit becomes complicated.

・ A large impact force is required to transmit the impact to the concrete inside through the formwork.

-A high-sensitivity detector is needed to capture elastic waves through the formwork.

-Since elastic waves are affected by the natural vibration of the mold, it is necessary to correct the input data of the frequency analyzer according to the difference in the material (wooden, steel, etc.) of the mold.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a void exploration device capable of instantaneously and accurately obtaining the location of a partial void with a simple device. .

[C] Means for Solving the Problems The present invention relates to a void exploration device for exploring a void by striking a hammer exploration object, and a striking part for reciprocating the hammer,
A microphone that collects the impact sound generated when the hammer hits the object to be probed, and an electrical signal corresponding to the sound pressure level of the impact sound generated when the hammer hits the object to be probed that does not have a void. A reference signal generating device for generating as a reference signal, and a comparison circuit for comparing the reference signal with an electric signal obtained by collecting the impact sound generated when the hammer hits the object to be probed with the microphone. And a display unit for displaying light or sound or a combination thereof according to the comparison result of the comparison circuit.

[D] Embodiment Hereinafter, one embodiment of the void probe according to the present invention will be described with reference to the drawings.

(1) Explanatory view of the whole device (FIG. 1) A probe according to the present invention includes a striking section for striking an object to be probed, a sound collecting section for collecting a hitting sound, and a sound collecting in the main body 1. An analysis unit that determines the generation state of voids based on the sounds collected by the department,
And a display unit that expresses the analysis result visually or auditorily.

(2) Striking part The storage cylinder 2 is hung vertically on the base plate 11 that divides the inner space of the main body 1 with the lower surface open.

A hammer 22 made of a ferromagnetic material inserted in a solenoid 21 is reciprocally housed in the housing cylinder 2.

The tip of the hammer 22 is arranged toward the opening 12 of the main body 1, and the spring 23 is locked by the stopper 23 at the base end side of the hammer 22.
Wrap around.

A cushioning material 24 such as rubber is attached to the lower surface of the substrate 11 at a position corresponding to the stopper 23 of the hammer 22.

(3) Periodic Signal Generating Unit The periodic signal generating unit 6 is a device which generates an ON / OFF signal from the periodic signal generating unit 6 for a predetermined period of time, at a constant period, or when necessary.

This signal is output to the solenoid 21 of the striking unit and the comparison circuit.

As a result, when the solenoid 21 is energized, the hammer 22 projects to the outside, and when it is OFF, it is returned to its original state by the force of the spring 25.

Since the sound wave can be input from the microphone 3 in accordance with the operation, the sound wave can be taken in only at the moment of striking, and other noises are not unnecessarily taken in when not striking.

However, there is no practical problem even if the microphone 3 is always taken in.

(4) Sound Collecting Section In the vicinity of the opening 12 in the main body 1, the microphone 3 is arranged at a position avoiding a collision with the hammer 22 and in a state where it does not directly contact the measurement target.

Therefore, a cylindrical sound collecting tube 31 is attached to the tip of the microphone 3, and the tip is arranged close to the object.

Then, the microphone 3 and the analysis unit are connected 32 so that the sound pressure of the impact sound collected by the sound collection tube 31 can be converted into an electric signal and transmitted to the analysis unit 7.

(5) Analysis Unit FIG. 2 shows a basic circuit diagram of the analysis unit 7. Reference numeral 4 in the drawing is a reference signal generation circuit.

This circuit 4 is a circuit for generating a reference signal which is a signal of the sound pressure level of the impact sound in a solid state in which no void exists in the object M to be probed. For example, the reference signal may be set to generate a voltage corresponding to the sound pressure level of the impact sound by changing the resistance value in the reference signal generation circuit 4 when the object to be probed having no void is hit. it can.

Since the sound pressure in this case is almost constant regardless of the thickness and material of the object M to be probed, once set, there is almost no need to adjust it.

Reference numeral 5 denotes a comparison circuit unit that compares the signal collected by the micro 22 and converted into a signal with the signal of the reference signal generation circuit 4.

(6) The display unit 51 is a light emitting circuit unit, and 52 is a buzzer circuit unit.

The light emitting circuit unit 51 and the buzzer circuit unit 52 are both connected to the comparison circuit unit 5, and some kinds of determination results given by the comparison circuit unit 5, for example, “peeled”, “not peeled”,
One of the light emitting diodes 53 to 55 is turned on based on the three kinds of judgment results of "neither can be said".

In addition, the buzzer 56 can be used to notify when "peeled".

(7) Other Examples The case where a solenoid is used has been described above.
Since the purpose is that the hammer hits the object to be measured even once, it is possible to adopt a known configuration in which the rotation of the motor is changed to the reciprocating movement of the hammer.

Next, a method of using the void probe will be described.

(1) Strike When electricity is started to the air gap probe, electricity flows to the solenoid 21, and the hammer 22 inserted in the solenoid 21 is excited and jumps to the outside. To start reciprocating motion.

In some cases, reciprocating motion is not required and only one impact may be required.

When the opening 12 of the main body 1 is brought into contact with the object to be probed M, the hammer 22
The tip of the object collides with the object M to be probed, and the impact sound is repeatedly generated.

(2) Analysis of Sound Collection and Impact Sound The sound pressure of the impact sound is collected by the microphone 3 through the sound collection tube 31, converted into an electric signal, and transmitted to the analysis unit 7.

The signal transmitted to the analysis unit 7 is collated with the preset sound pressure signal of the reference signal generation unit 4.

Then, the matching result is instantly obtained by the light emitting diodes 53 to 55,
Expressed at buzzer 56.

Therefore, the worker is required to emit the light from the light emitting diodes 53 to 55 and the buzzer.
The state of presence or absence of voids can be instantly grasped by the pronunciation of 56.

Note that the impact sound can be collected by the sound collecting unit in synchronization with the energization cycle of the solenoid 21.

[E] Effect Since the present invention is as described above, the following effects can be expected.

(1) Sound pressure of a hitting sound generated by a uniform hitting force,
This is a device having a structure for comparing the sound pressure data of the striking sound serving as a reference and determining the presence or absence of a void in the object to be probed.

Therefore, no individual differences, expert skills or specialized knowledge are required for the exploration work, and anyone can obtain an accurate exploration result in a moment by a simple operation.

(2) Since the electric signal of the hit sound received is used as it is, only the sound at the moment of hitting is sufficient, and it is not necessary to continue to collect the sound, so that the measurement can be performed quickly and the work efficiency can be improved.

(3) Since the tip of a hammer having a relatively small area hits the object to be probed rather than a large area, a partial probe is possible.

(4) Since it does not require a large-scale device, it can be miniaturized and convenient for handling and carrying.

(5) Since the automatic measurement is possible, the labor can be significantly reduced.

[Brief description of drawings]

 FIG. 1: Cross-sectional explanatory diagram of the void probe according to the present invention FIG. 2: Explanatory diagram of circuit of analysis unit FIG. 3: Explanatory diagram of usage condition 1: Main body, 21: Solenoid 7: Analysis unit, 22: Hammer , M: Object to be probed

Claims (1)

[Claims] 1. A void exploration device for exploring a void by hammering a hammer against an object to be probed, a hitting part for reciprocating the hammer, and a hitting sound generated when the hammer hits the object to be explored. A sounding microphone, a reference signal generator that generates, as a reference signal, an electric signal corresponding to the sound pressure level of the impact sound generated when the hammer is struck on an object to be probed without a gap, and the hammer is probed. A comparison circuit for comparing the electric signal obtained by collecting the hitting sound generated when hitting an object with the microphone and the reference signal, and a light or sound or a combination thereof depending on the comparison result of the comparison circuit. A void exploration device, comprising: a display unit for displaying.