JPH09228639A - Cement-composition sensor and cement-composition detector and cement-composition filling detecting device and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filling detector capable of simply detecting a placing (filling) status to the inside of an inmost closing space inexpensively in the placing of fresh concrete to the closing space. SOLUTION: Fresh concrete sensors 10 with two rod-shaped electrodes 2 are arranged at places, where filling statuses must be confirmed, and AC voltage fed from a commercial power supply is applied to the fresh concrete sensors 10. Reference voltage corresponding to a resistance value at a time when AC voltage is applied to fresh concrete is supplied from a reference voltage section 31, and a detecting signal Sc is output and the display statuses of LEDs 21 are changed when lowering from reference voltage of the detecting voltage (corresponding to a resistance value between the rod-shaped electrodes 2) converted into DCs by a conversion section 29 of the fresh concrete sensors 10 is detected by a comparator 30. The above-mentioned operation is conducted at every fresh concrete sensor 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects the presence or absence of a cement composition containing fresh concrete (concrete before being hardened), thereby filling the cement space into a closed space that cannot be visually observed. TECHNICAL FIELD The present invention relates to a cement composition sensor, a cement composition detector, and a cement composition filling detection device and method.

[0002]

2. Description of the Related Art Generally, when a concrete structure is manufactured, fresh concrete or the like is placed in a closed space surrounded by a mold (a space in which it is impossible to see every corner of the space). It is necessary to cast the cement composition of. At this time, depending on the shape of the closed space and the fluidity of the fresh concrete, it was not possible to fill every corner of the closed space, and after the fresh concrete hardened, the placement was insufficient only after the formwork was removed. May become apparent. In such a case, in the portion where the fresh concrete did not reach, after hardening, fresh concrete will be added anew, but in the case where fresh concrete is newly placed for the hardened concrete, These are not integrated,
Peeling of the newly added portion will occur.

Therefore, when placing fresh concrete in a formwork, it is determined whether or not the fresh concrete is spread to every corner in the formwork before the fresh concrete is hardened (normally, fresh concrete is Curing starts from the surface 1 to 2 hours after casting.)
It is necessary to investigate with the formwork installed.

[0004] In conducting this investigation, it is impossible to visually check every corner of the closed space inside the formwork. Therefore, conventionally, a skilled person hits the formwork with a mallet, etc. Judgments were made based on intuition.

[0005]

However, in the conventional method for confirming the placement based on the experience and intuition by the skilled person, there is a large difference between the confirmers, and even if it is judged that the person is filled, the filling is actually performed. There was a problem that it may not be. This problem becomes a serious problem when a shortage of fresh concrete is not allowed (for example, in the case of a dam water pipe or a foundation pillar of a highway).

Therefore, the present invention has been made in view of the above-mentioned problems, and its object is to check the filling condition in the closed space when casting a cement composition such as fresh concrete into the deep closed space. It is an object of the present invention to provide a cement composition sensor, a cement composition detector, and a cement composition filling detection device and method that can be simply and inexpensively detected.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 provides at least two rod-shaped electrodes to which an AC voltage is applied, and a support for supporting the rod-shaped electrodes substantially in parallel. And a section.

According to the action of the invention described in claim 1, since the AC voltage is applied to at least two rod-shaped electrodes supported substantially in parallel by the supporting portion, it is determined whether the cement composition is present or not. It can be electrically detected as a change in the resistance value between them.

Further, since the electrodes are rod-shaped, the contact area with the cement composition can be increased to reduce the contact resistance and accurate detection can be performed. In order to solve the above problems, the invention according to claim 2 provides the cement composition sensor according to claim 1, wherein the support part is made of plastic, and the rod-shaped electrode is a metal cylinder. It is configured by connecting lead wires.

According to the operation of the invention described in claim 2, in addition to the operation of the invention described in claim 1, the support portion is made of plastic, and the rod-shaped electrode connects the metal cylinder and the lead wire. Since it is configured as described above, the cement composition sensor can be configured easily and inexpensively.

In order to solve the above problems, the invention according to claim 3 provides the cement composition sensor according to claim 1 or 2, wherein the cement composition sensor is a cement composition sensor. When the cement composition is hardened while it is embedded in an article, the cement composition has a size that does not affect the strength of the hardened cement composition.

According to the action of the invention described in claim 3, in addition to the action of the invention described in claim 1 or 2, the cement composition sensor has the cement composition sensor embedded in the cement composition. Since the size of the cement composition does not affect the strength of the hardened cement composition when the cement composition is hardened, the cement composition sensor can be used as it is embedded in the cement composition.

In order to solve the above-mentioned problems, the invention according to claim 4 provides the cement composition sensor according to any one of claims 1 to 3, wherein the supporting portion detects the cement composition. It is configured to support the rod-shaped electrode with a strength capable of withstanding the fluid resistance of an object.

According to the action of the invention described in claim 4, in addition to the action of the invention described in any one of claims 1 to 3, the support part must endure the fluid resistance of the cement composition detected by the support part. Since the rod-shaped electrodes are supported with a strength that enables the rod-shaped electrodes to contact each other due to the flow of the cement composition,
It is possible to prevent breakage.

In order to solve the above-mentioned problems, the invention according to claim 5 is the cement composition according to any one of claims 1 to 4, which is arranged in a closed space in which the cement composition is to be filled. A sensor, an application unit such as a transformer that applies the AC voltage to the rod-shaped electrode, a measurement unit such as a converter that measures the resistance value between the rod-shaped electrodes to which the AC voltage is applied, and the measured resistance. When the value is below a predetermined value corresponding to the cement composition, a detection unit such as a comparator that outputs a detection signal, and based on the detection signal, indicates that the resistance value is below the predetermined value LE to do
D (Light Emitting Diode), lamp or CRT (Cath
od Ray Tube) and other display means.

According to the action of the invention described in claim 5, the cement composition sensor according to any one of claims 1 to 4 is arranged in a closed space to be filled with the cement composition.

At this time, the applying means applies an AC voltage to the rod-shaped electrode. Then, the measuring means measures the resistance value between the rod-shaped electrodes to which the AC voltage is applied. After that, the detection means outputs a detection signal when the measured resistance value becomes equal to or lower than a predetermined value corresponding to the cement composition.

As a result, the display means displays, based on the detection signal, that the resistance value has become equal to or lower than the predetermined value. Therefore, the presence or absence of the cement composition can be electrically and simply detected even in the deep closed space.

Further, since the electrodes are rod-shaped, the contact area with the cement composition can be increased to reduce the contact resistance and accurate detection can be performed. In order to solve the above problems, the invention according to claim 6 is any one of a plurality of claims 1 to 4 arranged in a direction in which the cement composition is to be filled in a closed space where the cement composition is to be filled. The cement composition sensor according to any one of claims 1 to 3, an application unit such as a transformer that applies the AC voltage to the rod-shaped electrodes in each of the cement composition sensors, and each rod-shaped electrode to which the AC voltage is applied. Measuring means such as a conversion unit for individually measuring the resistance value between the two, when each measured resistance value is equal to or less than a predetermined value corresponding to the cement composition, corresponding to each cement composition sensor A detection means such as a comparator that outputs a detection signal, and L that indicates, based on the detection signal, that the resistance value is equal to or less than the predetermined value, for each cement composition sensor.
And a display unit such as an ED, a lamp, or a CRT.

According to the operation of the invention described in claim 6, the plurality of cement composition sensors according to any one of claims 1 to 4 are the cement composition sensors in the closed space to be filled with the cement composition. They are arranged in the direction in which the objects should be filled.

At this time, the applying means applies an AC voltage to each rod-shaped electrode. Then, the measuring unit individually measures the resistance value between the rod-shaped electrodes to which the AC voltage is applied.

After that, the detecting means outputs a detection signal corresponding to each cement composition sensor when each measured resistance value becomes equal to or less than a predetermined value corresponding to the cement composition.

As a result, the display means displays, for each cement composition sensor, that the resistance value has become equal to or less than the predetermined value, based on the detection signal. Therefore, a plurality of cement composition sensors are arranged in the filling direction of the cement composition,
Since the detection status of the cement composition in each cement composition sensor can be displayed for each cement composition sensor, the filling status of the cement composition in the closed space can be known electrically and simply in real time. Further, since the electrode has a rod shape, the contact area with the cement composition can be increased to reduce the contact resistance and accurate detection can be performed.

In order to solve the above-mentioned problems, the invention according to claim 7 is the cement composition filling detection device according to claim 6, wherein the AC voltage is supplied from a commercial power source. It

According to the action of the invention described in claim 7, in addition to the action of the invention described in claim 6, since the AC voltage is supplied from the commercial power source, the filling of the cement composition with a simple structure is possible. You can check the situation.

In order to solve the above-mentioned problems, the invention according to claim 8 is characterized in that a plurality of claims 1 are arranged in a closed space in which the cement composition is to be filled, in a direction in which the cement composition is to be filled. 5. The application step of applying the AC voltage to the rod-shaped electrodes in the cement composition sensor according to any one of 4 and the measurement of individually measuring the resistance value between the rod-shaped electrodes to which the AC voltage is applied. Process,
When the measured resistance value of each is less than or equal to a predetermined value corresponding to the cement composition, a detection step of outputting a detection signal corresponding to each of the cement composition sensors,
And a display step of displaying, based on the detection signal, that the resistance value is equal to or less than the predetermined value for each of the cement composition sensors.

According to the action of the invention described in claim 8, in the applying step, a plurality of claims 1 to 4 are arranged in a direction to be filled with the cement composition in the closed space to be filled with the cement composition. An AC voltage is applied to each of the rod-shaped electrodes of the cement composition sensor described in any one of 1.

Then, in the measuring step, the resistance value between the rod-shaped electrodes to which the AC voltage is applied is individually measured.
After that, in the detection step, when the measured resistance values become equal to or lower than the predetermined value corresponding to the cement composition, the detection signals corresponding to the respective cement composition sensors are output.

As a result, in the display step, it is displayed for each cement composition sensor that the resistance value has become equal to or less than the predetermined value, based on the detection signal. Therefore, since the detection status of the cement composition in the plurality of cement composition sensors arranged in the filling direction of the cement composition can be displayed for each cement composition sensor, the filling status of the cement composition in the closed space is electrically measured. You can know in real time. Furthermore, since the shape of the electrode is rod-shaped,
Accurate detection can be performed by increasing the contact area with the cement composition to reduce the contact resistance.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION Next, preferred embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below describes an example in which the present invention is applied to fresh concrete among cement compositions. (I) Principle Before describing specific embodiments, the principle of fresh concrete detection in the present invention will be described.

In the present invention, the presence / absence of fresh concrete is detected by the change in the resistance value between the two electrodes to which the fresh concrete is placed and which is in contact with the fresh concrete.

That is, when the fresh concrete is cast in the closed space, there is a possibility that the fresh concrete, water and air may exist in the space. By the way, it has been known from experiments that the resistance values of fresh concrete, water and air to alternating current are 300Ω to 450Ω for fresh concrete, 2.5 KΩ or more for water, and almost infinite for air (specifically, The experimental results will be shown later in the section of Examples). The reason why fresh concrete shows a lower resistance value than water is considered that the cement contained in fresh concrete dissolves in water, the components of the cement are ionized, and the ionized components serve as carriers to flow current. .

In the present invention, it is intended to detect only fresh concrete by using the above-mentioned difference in resistance value between fresh concrete, water and air. Next, specific embodiments will be described with reference to the drawings. In addition, in the following embodiments, a case will be described in which fresh concrete is filled in a closed space surrounded by a mold and in which reinforcing bars are arranged. (II) Embodiment of Fresh Concrete Sensor First, an embodiment of a fresh concrete sensor corresponding to the invention described in claims 1 to 4 will be described with reference to FIGS. 1 and 2.

As shown in FIGS. 1 (a) to 1 (c), the fresh concrete sensor 10 of the embodiment comprises a support 1 made of plastic and two rod-shaped electrodes 2.

In the rod-shaped electrode 2, the lead wire 3 is passed through the metal cylinder 2 ', and the metal cylinder 2'and the lead wire 3 are soldered at the tip of the metal cylinder 2'. There is. Further, the supporting portion 1 has a strength enough to withstand the flow resistance of the fresh concrete to be detected, and each of the rod-shaped electrodes 2 has a strength.
Are supported substantially parallel to each other. Further, the strength of the metal cylinder 2'is also set to withstand the flow resistance of the fresh concrete to be detected. The method of connecting the lead wire 3 to the metal cylinder 2 ′ may be performed by crimping the metal cylinder 2 ′ with a crimping tool or the like, in addition to the method by soldering described above. Further, the lead wire 3 may be connected to the base portion of the metal cylinder 2 ′ instead of the tip portion thereof.

Further, the supporting portion 1 is provided with a mounting hole 4 for mounting the fresh concrete sensor 10 on a reinforcing bar 5 described later. It should be noted that the actual size of the fresh concrete sensor 10 shown in FIG. 1 is about 10 mm to 20 mm when the length of the portion indicated by reference symbol A in FIG.
1B has a length of about 5 mm to 15 mm, and FIG. 1B has a length of 5 mm to 1 mm.
0 mm, and the length of the part indicated by the symbol D in Fig. 1 (c) is 5 mm
It is about 15 mm. The rod-shaped electrode 2 has a length of 5
The diameter is about 1 mm to 3 mm, and the diameter between the rod-shaped electrodes 2 is about 1 mm to 30 mm. These sizes are determined on the basis of sizes that do not affect the strength of the hardened concrete when the fresh concrete is hardened while being embedded in the fresh concrete to be detected by the fresh concrete sensor 10. .

Next, a method of attaching the fresh concrete sensor 10 to the reinforcing bar 5 will be described. As for the method of attaching the fresh concrete sensor 10 to the reinforcing bar 5, as shown in FIGS. 1 (d) and 1 (e), the fresh concrete sensor 10 is a wire that passes through the mounting hole 4 with respect to the reinforcing bar 5 in the closed space. It is fixed by 6.

In the above description, the supporting portion 1 is made of plastic, but the supporting portion 1 is not limited to this, and any inexpensive material such as metal or other resin or insulation from the rod-shaped electrode 2 may be used. It may be formed using hard rubber or the like.

Next, the fresh concrete sensor 10
Another embodiment relating to the shape will be described with reference to FIG. The shape of the fresh concrete sensor 10 and the method of attaching the fresh concrete sensor 10 to the reinforcing bar 5 are not limited to the form shown in FIG. 1, but the forms shown in FIGS. 2 (a) and 2 (b) are possible. In addition, the actual size of the fresh concrete sensor 10 in each form is set to be about the same size as the fresh concrete sensor 10 shown in FIG. 1, and the fresh concrete sensor 10 is embedded in the fresh concrete to be detected by the fresh concrete sensor 10. When the concrete is hardened, it is determined based on a size that does not affect the strength of the hardened concrete.

Further, as shown in FIG. 2C, the fresh concrete sensor 10 may be directly attached to the mold so that the rod-shaped electrode 2 is projected to the side filled with fresh concrete. In this case, the fresh concrete sensor 10 is directly attached to the mold with screws or the like.

Further, the fresh concrete sensor 10
In case of pulling out and reusing after using (after hardening of fresh concrete), the shape of the rod-shaped electrode 2 is shown in FIG.
As shown in (d), it may be tapered. (III) The first example of fresh concrete filling detector
Embodiment Next, a first embodiment of a fresh concrete filling detection device corresponding to the invention described in claims 5 to 7 will be described with reference to FIGS. 3 to 5.

First, the external appearance of the fresh concrete filling detection apparatus according to the embodiment will be described with reference to FIG.
As shown in FIG. 3, a fresh concrete filling detection device 20 of the embodiment includes a connector 22 for connecting a plurality of fresh concrete sensors 10 and a connector 2.
LE as display means provided in one-to-one correspondence with each fresh concrete sensor 10 via
D21, a power switch 23, a fuse 24 for circuit protection, a ground terminal 25, and a power source 26 connected to a commercial power source. The fresh concrete filling detection device 20 shown in FIG. 3 is connectable with ten fresh concrete sensors 10.

Next, a specific circuit configuration of the fresh concrete filling detection device 20 will be described with reference to FIG. As shown in FIG. 4, in the fresh concrete filling detection device 20, a series resistance 27, a conversion unit 29 as a measurement unit, and a comparator 3 as a detection unit.
0 and the LED 21 form one fresh concrete detector 20A corresponding to one fresh concrete sensor 10, and at least the number of fresh concrete detectors 20A corresponding to the number of the fresh concrete sensors 10 make the fresh concrete filling detection device 20. Is configured.

Further, the fresh concrete filling detection device 20 is, as a constituent member common to each fresh concrete detector 20A, a reference voltage section 31 for generating a reference voltage corresponding to the resistance value of the fresh concrete when an AC voltage is applied. And the transformation unit 28 and the transformation unit 2 described above.
The circuit power supply 32 supplies power to the comparator 9, the LED 21, and the like, and the power switch 23, the fuse 24, and the power supply 26 described above.

Further, the reference voltage section 31 is a conversion section 31A for converting the AC voltage supplied from the transformer section 28 into a DC voltage.
And a setting unit 31B that sets a reference voltage based on the converted DC voltage.

Here, each fresh concrete sensor 10 is installed in a closed space in the mold where the fresh concrete is to be filled. Next, the operation will be described with reference to FIG. In the following description of the operation, the operation of one fresh concrete detector 20A will be mainly described.

AC voltage (voltage 100 V, frequency 50 Hz or 60 Hz) supplied from a commercial power source through the power source 26
Is input to the transformer 28 via the power switch 23 and the fuse 24.

Here, the transformer 28 is composed of a transformer or the like (not shown), which reduces the AC voltage of 100V to about 5V to 6V while maintaining the frequency, and through the series resistors 27, respectively. The fresh concrete sensor 10 is supplied.

The fresh concrete sensor 1
When the rod-shaped electrode 2 at 0 contacts the fresh concrete, the conversion unit 29 detects a change in the resistance value between the rod-shaped electrodes 2 before and after the contact as a change in the AC voltage, converts the value into a DC voltage, and the comparator 30 Output to.

After that, the comparator 30 monitors a change in the DC voltage output from the conversion unit 29 before and after the fresh concrete sensor 10 contacts the fresh concrete, and the DC voltage is output from the reference voltage unit 31 to the reference voltage. When it becomes lower, that is, the rod electrode 2
When it is detected that the resistance value between the rod-shaped electrodes 2 is lower than the above predetermined resistance value corresponding to fresh concrete (the voltage corresponding to this resistance value corresponds to the reference voltage). Exists (in other words, it is filled with fresh concrete up to the position where the fresh concrete sensor 10 having the rod-shaped electrode 2 is installed), the detection signal S _C is output to the LED 21. Then, the LED 21 receives the detection signal S _C based on the detection signal S _C ,
The display state is changed. This change is performed, for example, by switching the connected red LED to the green LED until the detection signal S _C is input.

By the operation of one fresh concrete detector 20A described above, the detection display of the fresh concrete using one fresh concrete sensor 10 is performed. Since the fresh concrete sensor 10 is installed at the position where the fresh concrete is to be filled, the filling status of the fresh concrete at each position is displayed for each position.

Next, the arrangement of the fresh concrete sensor 10 in actual placement of fresh concrete will be described with reference to FIG. FIG. 5 shows an example of constructing a concrete building having a shape in which a cylinder is divided in half in the central axis direction.

As shown in FIG. 5, when constructing the building with concrete, the outer frame 40 and the inner frame 41 are constructed first, and the space between the outer frame 40 and the inner frame 41 (see FIG. 5). Fresh concrete will be placed in the middle shaded area.). At that time, the fresh concrete is placed by the injection port 42 formed in the outer frame 40 at the center upper part of the cylinder to be formed, and spreads in the direction shown by the solid line arrow in FIG. From the bottom of the space between 41
It will be placed (accumulated) in the direction indicated by the dashed arrow. The mold in this case has a thickness of, for example, 12
It is made of plywood or iron of about mm.

At this time, each of the fresh concrete sensors 10 has a reinforcing bar 5 (actually, a skeleton in the space) so that the rod-shaped electrode 2 is on the space side between the outer frame 40 and the inner frame 41. 5 are assembled in a lattice shape, but not shown in FIG. 5 for clarity of explanation.) And as shown in FIG. The sensor rows are arranged so as to form one row in the circumferential direction, and further, a plurality of such sensor rows (7 rows in the case shown in FIG. 5) are configured. In addition, in the case of FIG. 5, the length indicated by the symbol E is about 10 m and the length indicated by the symbol F is about 9 m, but in FIG. 5, the arrangement state of the fresh concrete sensor 10 is shown. For clarity, the longitudinal direction of the cylinder is drawn longer than it actually is.

Then, the respective fresh concrete sensors 10 arranged as shown in FIG. 5 are connected to the fresh concrete filling detection device 20 having the structure shown in FIG. 4, and the space between the outer frame 40 and the inner frame 41. The filling status of fresh concrete in is displayed. The fresh concrete filling detection device 20 in this case is
In order to connect the number of fresh concrete sensors 10 shown in FIG. 5, the number of fresh concrete detectors 20A corresponding to the number of the fresh concrete sensors 10 will be provided.

If the fresh concrete filling detection device 20 does not confirm the filling of fresh concrete, the outer frame 40 and the inner frame 41 are vibrated by a vibrator or the like as necessary to fill the fresh concrete. Will be promoted.

After the fresh concrete is hardened, the fresh concrete sensor 10 is left in the concrete together with the reinforcing bar 5 while being left in the concrete, and the lead wire 3 drawn out from the concrete after hardening is cut to cut the fresh concrete filling detecting device. 20 will be separated.

As described above, according to the fresh concrete filling detection apparatus 20 of the first embodiment, the presence or absence of fresh concrete is detected by using the difference in the resistance value between fresh concrete, water and air. The filling status of fresh concrete can be surely confirmed.

Also, the fresh concrete sensor 10
In the above, the support portion 1 is made of plastic, and the rod-shaped electrode 2 passes the lead wire 3 through the metal cylinder 2'and connects the lead wire 3 to the metal cylinder 2'at the tip of the metal cylinder 2 '. With such a configuration, a simple and inexpensive fresh concrete sensor 10 can be obtained, and the fresh concrete filling detection can be performed at low cost as a whole. Further, since the electrodes are rod-shaped, the contact area with the fresh concrete can be increased to reduce the contact resistance, and accurate detection can be performed.

Further, the fresh concrete sensor 10
When using, the length of the rod-shaped electrode 2 is selected, or the setting value of the reference voltage in the setting unit 31B (see FIG. 4) is set to an appropriate value, so that the mold and the freshness after filling are set. When a gap is provided between the concrete and the gap, a desired allowable range can be set for the gap.

Furthermore, the fresh concrete sensor 10 has a size that does not affect the strength of the hardened fresh concrete when the fresh concrete hardens while being embedded in the fresh concrete. It is possible to dispose 10 while being embedded in fresh concrete.

Further, since the supporting portion 1 supports the rod-shaped electrodes 2 with a strength capable of withstanding the fluid resistance of the fresh concrete to be detected, the rod-shaped electrodes 2 may come into contact with each other or be broken by the flow of the fresh concrete. Can be prevented.

Further, the fresh concrete sensor 10
Since the AC voltage supplied to the
You can check the filling status of fresh concrete with a simple configuration.

In the first embodiment described above, the general description has been made of fresh concrete, but the present invention is not limited to this, and in contrast to high-fluidity fresh concrete, which has recently attracted attention as high-quality, labor-saving concrete. It is particularly suitable.

Further, it can be applied to the detection of cement composition building materials such as mortar and paste other than concrete. At that time, the resistance value of the cement composition is supplied from the reference voltage unit 31 so that the resistance value of the cement composition and the resistance value of water or air can be distinguished from each other according to the resistance value specific to the cement composition to be detected. It is necessary to set the reference voltage that

Also, the fresh concrete sensor 10
Although the AC voltage applied to the circuit has a waveform of the commercial power source as it is, it may be converted into a rectangular wave or the like. Furthermore, if the fresh concrete filling detection device 20 shown in FIG. 3 or 4 is provided with an output device such as a simple printer such as a thermal printer, it is possible to record the detection condition on the spot, and the portable fresh concrete filling device can be recorded. A filling detection device can also be configured.

Further, in the fresh concrete filling detection device 20 shown in FIG. 3 or 4, the AC voltage supplied from the commercial power source of 100 V is stepped down and applied to the fresh concrete sensor 10, but the invention is not limited to this. , AC voltage supplied from a commercial power source of 200 V may be stepped down and applied to the fresh concrete sensor 10.

Furthermore, an AC voltage is supplied from a generator (the voltage is often 200 V AC) used at a construction site, and the AC voltage is stepped down and applied to the fresh concrete sensor 10. Good. In this case, the fresh concrete filling detection device 20 can be operated in a place where a commercial power source cannot be used, and the power source can be shared with a heavy machine or the like at a construction site, which further simplifies.

At this time, even if the voltage or frequency of the AC voltage supply source fluctuates, according to the present embodiment,
Since the reference voltage supplied from the reference voltage unit 31 also changes in response to the fluctuation, the relationship between the resistance value between the rod-shaped electrodes 2 and the reference voltage does not change relatively, and a stable fresh concrete Detection can be performed.

Further, the LED 21 may be a lamp, a CRT or the like. (IV) Second implementation of fresh concrete filling detector
Mode Next, a second embodiment of the fresh concrete filling detection device corresponding to the invention described in claim 8 will be described with reference to FIG.
It will be described with reference to FIGS.

In the above-described first embodiment, the fresh concrete filling detection device 20 is composed of a plurality of fresh concrete detectors 20A, but in the second embodiment, the fresh concrete detector 20A.
It is intended to cause a computer to execute the operation in.

In the second embodiment described below, a fresh concrete filling detection device for detecting the filling state of fresh concrete when forming a semi-cylindrical building shown in FIG. 5 will be described.

First, the configuration of the fresh concrete filling detection apparatus according to the second embodiment will be described with reference to FIG. As shown in FIG. 6, the fresh concrete filling detection device 50 of the second embodiment is connected with a required number of fresh concrete sensors 10 and switches each of the fresh concrete sensors 10 based on a command from a computer 55 described later. It is composed of a sensor scanning unit 51 that outputs the detection voltage, a general-purpose computer 55 that performs a fresh concrete filling detection operation described below, and a CRT 56 that outputs the detection result.

The sensor scanning unit 51 is connected to a plurality of fresh concrete sensors 10 and switches the fresh concrete sensors 10 to the respective fresh concrete sensors 10 based on a control signal S _S described later. A scanner 52 that applies an AC voltage, and further switches and outputs an AC detection voltage of each fresh concrete sensor 10 (corresponding to the resistance value between the rod-shaped electrodes 2 in each fresh concrete sensor 10), and a scanner. A conversion unit 29 for converting the AC detection voltage output from 52 into a DC detection voltage, an A / D converter 53 for A / D (Analog / Digital) conversion of the converted DC detection voltage, and a command from the computer 55. The above control for switching the detection voltage of the fresh concrete sensor 10 by While outputting the signal S _S ,
A microcomputer 54 that temporarily stores the detected voltage output from the A / D converter 53 and outputs it to the computer 55 when necessary, a power supply 26 connected to a commercial power supply, a power switch 23, and a fuse 24. , The AC voltage supplied from the power supply 26 is transformed, and the scanner 52 is connected via the DC resistance 27.
, The scanner 52, the conversion unit 29,
Circuit power supply 5 that supplies power supply voltage to the microcomputer 54, etc.
7.

Next, the operation of the fresh concrete filling detection device 50 will be described with reference to FIG. 7, focusing on the fresh concrete filling detection operation executed by the computer 55.

As shown in the flow chart of FIG. 7, in the fresh concrete filling detection device 50, first, a counter (not shown) storing the sensor numbers indicating the respective fresh concrete sensors 10 (the microcomputer 54).
It is provided inside. ) Is initialized (step S
1).

Next, in order to apply an AC voltage to the fresh concrete sensor 10 corresponding to the number indicated by the counter, the microcomputer 54 outputs a control signal S _S to the fresh concrete sensor 10 corresponding to the sensor number indicated by the counter. The alternating voltage transformed from the transformer 28 by the switching operation of the scanner 52 is applied (step S).
2).

In step S3, the resistance between the rod-shaped electrodes 2 in the fresh concrete sensor 10 is converted by taking in the detection voltage of the fresh concrete sensor 10 to which the AC voltage is applied and converting the value of the detection voltage into a resistance value. Measure the value.

Thereafter, it is determined whether or not the measured resistance value is equal to or less than a predetermined threshold value (a value of 300Ω to 450Ω as described above) corresponding to the resistance value when an AC voltage is applied to the fresh concrete ( Step S4).

In the determination in step S4, when the measured resistance value is not less than the predetermined threshold value (step S4; NO), there is no fresh concrete at the position of the corresponding fresh concrete sensor 10, that is, the fresh concrete sensor 10 It is displayed that the fresh concrete has not been filled up to the position (step S6).

On the other hand, when the measured resistance value is equal to or less than the predetermined threshold value (step S4; YES), it is indicated that the fresh concrete has been filled up to the position of the corresponding fresh concrete sensor 10, and the filling on the CRT 56 is indicated. A predetermined display is performed (step S5), then it is determined whether or not the measurement has been completed for all the fresh concrete sensors 10 (step S7), and if not completed (step S7; NO), In order to acquire the detection voltage of the next fresh concrete sensor 10, the counter indicating the number of the fresh concrete sensor 10 to which the AC voltage should be applied is incremented by "1" and the process returns to step S2.

The above operation is repeated for all fresh concrete sensors 10. On the other hand, when the processing for all the fresh concrete sensors 10 is completed (step S7; YES), all the detection processing is completed.

The program for the fresh concrete filling detection operation corresponding to the flowchart shown in FIG.
It may be stored in (Read Only Memory) or F
It is stored in a storage medium such as a D (Flexible Disk),
It may be read and executed each time fresh concrete filling is detected.

Next, a display example on the CRT 56 will be described with reference to FIG. In the display example shown in FIG. 8, the left side of the figure corresponds to the longitudinal side surface of the semi-cylindrical building shown in FIG. 5, and the right side of the figure corresponds to the front side of the semi-cylindrical building. In FIG. 8, white circles correspond to the positions of the fresh concrete sensors 10.

When the fresh concrete is not filled, the inside of the white circle is red, and the inside of the white circle corresponding to the fresh concrete sensor 10 which has detected the fresh concrete is sequentially changed to green at the position where the fresh concrete is filled. . That is, FIG.
In the example shown in FIG. 8, the display is sequentially changed from red to green in the direction shown by the solid line arrow in FIG. 8 with the pouring of fresh concrete. As described above, according to the fresh concrete filling detection device 50 of the second embodiment, the main fresh concrete filling detection operation is performed by the computer 55, the AC voltage is supplied to the fresh concrete sensor 10, and the switching operation of the fresh concrete sensor 10 is performed. Since only the sensor scanning unit 51 performs the above, the configuration of the entire fresh concrete filling detection device can be simplified in addition to the effect of the fresh concrete filling detection device of the first embodiment, and the fresh concrete filling detection can be performed more easily. It can be carried out.

If the output device such as a printer for outputting the display result on the CRT 56 is connected to the computer 55 in addition to the configuration of the fresh concrete filling detection device 50, the filling condition is recorded on the spot in real time. be able to.

When the display result on the CRT 56 is output together with the time, the filling condition of fresh concrete can be recorded in more detail.

[0088]

EXAMPLES Next, the experimental results of the resistance value of the fresh concrete to the alternating current described in the above section “(I) Principle” will be described with reference to FIG. Note that FIG.
(A) is the application of an AC voltage to the rod-shaped electrode 2,
It is the result of measuring the resistance value by changing the frequency at the time of application, and FIG. 9B shows the result of measuring the resistance value by changing the applied voltage.

First, as shown in FIG. 9 (a), when the frequency of the AC voltage is changed, it is 5 which is the frequency of the commercial power source.
The resistance value is about 420 Ω near 0 Hz or 60 Hz. On the other hand, as shown in FIG. 9B, when the applied voltage is changed, the resistance value is approximately 300Ω (more specifically, the shape of the rod electrode 2 is 2 mm in diameter, 10 mm in length, and 7 mm in interval). Is stable at 300 Ω.). Furthermore, these resistance values are sufficiently smaller than the resistance value of water (about 2.5 KΩ) or the resistance value of air.

Therefore, the fresh concrete sensor 1
As an example of the AC voltage applied to 0, it is understood that the voltage may be about 5V to 10V and the frequency may be 50Hz or 60Hz of the commercial power source.

Further, as an example of the reference voltage supplied to the comparator 30, if the voltage corresponding to the resistance value between the rod electrodes 2 is set to 500Ω to 2KΩ, only fresh concrete can be detected well. -It will be possible to identify.

[0092]

As described above, according to the invention described in claim 1, since an AC voltage is applied to at least two rod-shaped electrodes supported substantially in parallel by the supporting portion, the cement composition The presence or absence of can be electrically detected as a change in the resistance value between the rod electrodes.

Therefore, even if the cement composition is present in the closed space, which is difficult to visually observe,
It can be reliably detected electrically. Further, since the electrode has a rod shape, the contact area with the cement composition can be increased to reduce the contact resistance and accurate detection can be performed.

According to the invention of claim 2, claim 1
In addition to the effects of the invention described in (1), since the supporting portion is made of plastic and the rod-shaped electrode is configured by connecting the metal cylinder and the lead wire, the cement composition sensor can be configured easily and inexpensively. it can.

According to the invention of claim 3, claim 1
Or in addition to the effect of the invention described in 2, when the cement composition sensor hardens while the cement composition sensor is embedded in the cement composition, the cement composition sensor affects the strength of the hardened cement composition. Since the size of the cement composition sensor does not exceed that of the cement composition, the cement composition sensor can be disposable while being embedded in the cement composition.

According to the invention of claim 4, claim 1
In addition to the effect of the invention described in any one of 1 to 3, since the rod-shaped electrode is supported with a strength that can withstand the fluid resistance of the cement composition detected by the supporting portion, the rod-shaped electrode is supported by the flow of the cement composition Can be prevented from coming into contact with each other or breaking.

According to the invention of claim 5, claim 1
The cement composition sensor according to any one of 1 to 4 is arranged in a closed space in which the cement composition should be filled, and an AC voltage is applied to the sensor to electrically detect the presence or absence of the cement composition. , Even in a deep closed space,
The presence or absence of the cement composition can be easily detected.
Further, since the electrode has a rod shape, the contact area with the cement composition can be increased to reduce the contact resistance and accurate detection can be performed.

According to the invention described in claim 6, a plurality of cement composition sensors are arranged in the filling direction of the cement composition, and the detection status of the cement composition in each cement composition sensor is determined by the respective cement composition. Since it can be displayed for each sensor, it is possible to easily and electrically know the filling status of the cement composition in the closed space in real time. Further, since the electrode has a rod shape, the contact area with the cement composition can be increased to reduce the contact resistance and accurate detection can be performed.

Therefore, the filling status of the cement composition in the closed space, which is difficult to be visually observed, can be detected reliably and easily in real time. According to the invention described in claim 7, in addition to the effect of the invention described in claim 6, since the AC voltage is supplied from the commercial power source,
The filling status of the cement composition can be confirmed with a simple configuration.

According to the eighth aspect of the present invention, the plurality of cement composition sensors are arranged in the filling direction of the cement composition, and the detection status of the cement composition in each cement composition sensor is determined by the respective cement composition. Since it can be displayed for each sensor, the filling status of the cement composition in the closed space can be electrically known in real time. Furthermore,
Since the electrode has a rod shape, the contact area with the cement composition can be increased to reduce the contact resistance and accurate detection can be performed.

Therefore, the filling state of the cement composition in the closed space, which is difficult to be visually observed, can be reliably detected in real time.

[Brief description of drawings]

FIG. 1 is a diagram showing a shape and a mounting mode of a fresh concrete sensor, (a) is a plan view, (b) is a side view, (c) is a front view, and (d) is a reinforcing bar. It is a side view at the time of attaching to, and (e) is a front view at the time of attaching to a rebar.

FIG. 2 is a diagram showing a shape and an attachment mode in another embodiment of the fresh concrete sensor, (a) being a second
It is a figure showing an embodiment, (b) is a figure showing the 3rd embodiment, (c) is a figure showing the 4th embodiment,
(D) is a figure showing a 5th embodiment.

FIG. 3 is a plan view showing the external appearance of the fresh concrete filling detection device according to the first embodiment.

FIG. 4 is a block diagram showing a schematic configuration of a fresh concrete filling detection device according to the first embodiment.

FIG. 5 is a perspective view showing a mounting example of a fresh concrete sensor.

FIG. 6 is a block diagram showing a schematic configuration of a fresh concrete filling detection device according to a second embodiment.

FIG. 7 is a flowchart showing a fresh concrete filling detection operation according to the second embodiment.

FIG. 8 is a diagram showing a display example in the second embodiment.

FIG. 9 is a diagram showing the resistance value of fresh concrete when the frequency of the AC voltage and the voltage are changed, (a)
FIG. 4A is a diagram showing a change in resistance value when the frequency is changed, and FIG. 7B is a diagram showing a change in resistance value when the voltage is changed.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Support part 2 ... Rod-shaped electrode 2 '... Metal cylinder 3 ... Lead wire 4 ... Mounting hole 5 ... Reinforcing bar 6 ... Wire 10 ... Fresh concrete sensor 20, 50 ... Fresh concrete filling detector 20A ... Fresh concrete filling detector 21 ... LED 22 ... Connector 23 ... Power switch 24 ... Fuse 25 ... Ground terminal 26 ... Power supply 27 ... Series resistance 28 ... Transformer section 29, 31A ... Converter section 30 ... Comparator 31 ... Reference voltage section 31B ... Setting section 32, 57 ... Circuit power supply 40 ... Outer frame 41 ... Inner frame 42 ... Injection port 51 ... Sensor scanning section 52 ... Scanner 53 ... A / D converter 54 ... Microcomputer 55 ... Computer 56 ... CRT S _C ... Detection signal S _S ... Control signal

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hideaki Taniguchi 36-1 Aoji Construction Co., Ltd. Tsukuba City, Ibaraki Prefecture (72) Inventor Hiroshi Enomoto 1-4-3 Sarakucho, Chiyoda-ku, Tokyo Mikasa Industry Co., Ltd. Incorporated (72) Inventor Akinobu Shionoya 15-1 Shimookasaki, Shiraoka-cho, Minamisaitama-gun, Saitama Mikasa Sangyo Co., Ltd. (72) Inventor Takuma Takeuchi 1-30-4 Tomagome, Ota-ku, Tokyo Nagano Keiki Co., Ltd. (72) Inventor Tetsuo Ogawa 1-30-4 Higashimagome, Ota-ku, Tokyo Nagano Keiki Seisakusho Co., Ltd. (72) Inventor Kazutaka Kushita 1-54-5 Kumegawa-cho, Higashimurayama-shi, Tokyo

Claims (8)

[Claims] 1. A cement composition sensor comprising: at least two rod-shaped electrodes to which an AC voltage is applied; and a support portion that supports the rod-shaped electrodes substantially in parallel. 2. The cement composition sensor according to claim 1, wherein the support portion is made of plastic, and the rod-shaped electrode is formed by connecting a metal cylinder and a lead wire. Cement composition sensor. 3. The cement composition sensor according to claim 1, wherein the cement composition sensor is hardened when the cement composition hardens while the cement composition sensor is embedded in the cement composition. A cement composition sensor having a size that does not affect the strength of the cement composition. 4. The cement composition sensor according to any one of claims 1 to 3, wherein the supporting portion supports the rod-shaped electrode with a strength capable of withstanding a fluid resistance of the cement composition to be detected. A cement composition sensor, comprising: 5. The cement composition sensor according to any one of claims 1 to 4, which is arranged in a closed space to be filled with a cement composition, and an application unit which applies the AC voltage to the rod-shaped electrode. A measuring means for measuring the resistance value between the rod-shaped electrodes to which the alternating voltage is applied, and a detecting means for outputting a detection signal when the measured resistance value is equal to or lower than a predetermined value corresponding to the cement composition. And a display unit for displaying that the resistance value has become equal to or lower than the predetermined value based on the detection signal, and a cement composition detector. 6. The cement composition sensor according to any one of claims 1 to 4, wherein the cement composition sensor is arranged in a direction in which the cement composition is to be filled in a closed space where the cement composition is to be filled. Applying means for applying the AC voltage to the rod-shaped electrodes in the cement composition sensor, and measuring means for individually measuring the resistance value between the rod-shaped electrodes to which the AC voltage is applied, and the measured When each resistance value is equal to or less than a predetermined value corresponding to the cement composition, a detection unit that outputs a detection signal corresponding to each of the cement composition sensors, and based on the detection signal, the resistance value is A cement composition filling detection device, comprising: a display unit that displays that the value becomes equal to or less than the predetermined value for each of the cement composition sensors. 7. The cement composition filling detecting device according to claim 6, wherein the AC voltage is supplied from a commercial power source. 8. The rod shape in the cement composition sensor according to claim 1, wherein a plurality of rods are arranged in a direction in which the cement composition is to be filled in a closed space to be filled with the cement composition. An applying step of applying the AC voltage to the electrodes, respectively, a measuring step of individually measuring the resistance value between the rod-shaped electrodes to which the AC voltage is applied, and the measured resistance value of the cement composition When it is less than or equal to a predetermined value corresponding to, a detection step of outputting a detection signal corresponding to each of the cement composition sensors, based on the detection signal, the resistance value is below the predetermined value And a display step for displaying each of the cement composition sensors.