KR100563542B1 - Depth estimating device of steel embedded deep foundation - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a deep-based depth detection device in which steel is reinforced using a digital three-component flux-gate magnetic field meter. In particular, a flux gate sensor is inserted into a borehole to detect an induced magnetic field generated from steel and output it as a digital signal. And means for converting the digital sensing information output from the sensor into a RS-422 communication protocol capable of long distance transmission, a highly compatible RS-232 communication protocol, and a USB communication protocol that can be supplied to a portable computer such as a notebook computer. It can be configured to store and output the information detected by the flux gate sensor through a portable computer such as a notebook computer equipped with only one USB line, and to reduce the appearance of the product as well as the built-in battery. As it works, you can measure the depth of the foundation anywhere. In addition, the digitized flux gate sensor is able to detect and transmit large amounts of data, so that the steel is reinforced using a digital three-component flux-gate magnetic field meter, which gives a highly reliable measurement value. A deep base depth detector.

Digital, Magnetic Field Meter, Iron, Depth Detection, Portable Computer

Description

Depth estimating device of steel embedded deep foundation using steel three-component fluxgate magnetic field detector

1 is a schematic view showing a depth detection device of the present invention.

Figure 2 is a block diagram showing a depth detection device of the present invention.

3 is a graph showing a method for estimating the steel ends by induction magnetic field analysis.

4 is a graph showing the output curve of the induced magnetic field detected by the present invention.

5 is a schematic view showing a conventional depth detection device.

Figure 6 is a block diagram showing a conventional depth detector.

※ Explanation of code for main part of drawing

1: sensing means, 2: signal acquisition / processing means,

3: portable computer, 4: cable support,

5: foundation, 6: steel,

9: borehole, 11: digital three-component flux-gate sensor,

12: first converter, 13: leak detector,

21: second converter, 22: depth pulse generator,

23: depth pulse generation control unit, 24: leak alarm unit,

25: third converter

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a deep-based depth detection device in which steel is reinforced using a digital three-component flux-gate magnetic field meter. In particular, a portable computer such as a notebook computer having only one USB wire for information detected by the flux gate sensor is provided. Can be stored and printed out, the product's appearance can be reduced, and as a built-in battery, the depth of the foundation can be measured anywhere, and the digitized flux gate sensor It is a deep-based depth detection device based on steel, which uses a digital three-component flux-gate magnetic field meter, which can detect and transmit data, and thus obtain a highly reliable measurement value.

In general, the foundation of a piers or large structures consists of concrete piles reinforced with rebar, and if the design drawings of such foundations are not available, the depth of the foundation pile is measured by measuring the depth of the foundation piles.

4 and 5 show a conventional depth-detection apparatus (patent application No. 1998-8981) of the prior application,

In the rebar detection device for detecting the bottom depth of the rebar in the concrete foundation pile,

An analog type three-component magnetic field measuring sensor 31 inserted into an exploration borehole 40 drilled in parallel with the foundation pile and measuring an induction magnetic field of reinforcing bars in the foundation pile, and the three-component magnetic field measuring sensor 31. The low pass filter 32 into which the signal measured by the input signal is input, the signal passing through the low pass filter 32, and a signal switch board 33 through which the component passes, and the induction magnetic field sensing through the signal switch board 33. The ultra-precision voltmeter 34 into which signals are sequentially input, the depth pulse generator 35 measuring the insertion depth of the three-component magnetic field measuring sensor 31 inserted into the exploration borehole 40, and the ultra precision voltmeter 34. The industrial small computer 36 in which the coarse signal and the signal of the depth pulse generator 35 are recorded, the battery 38 for outputting the DC voltage, and the output voltage of the battery 38 are converted to AC 100V for each component. To drive power of Using the induced magnetic field of the information is composed of the inverter 39 are detected on the three-component magnetic field sensor 31 will be reinforced to determine the depth of the reinforcement installed to the depth.

However, the conventional basic depth detection device has the following problems.

Since the conventional technology is an analog type in which the three-component magnetic field measuring sensor 31 which detects the induction magnetic field of the reinforcing bar is an analog signal outputting the detection signal as an analog signal, the low pass filter for allowing the small computer 36 to recognize the analog detection signal. (32), components such as the signal wiring board 33, the ultra-precision voltmeter 34, etc. are required to be essential, there is a problem that not only the volume of the product but also the structure is complicated.

In addition, the ultra-precision voltmeter 34, the industrial small computer 36, the small color monitor 37 and the like are driven by an AC 100V power supply, so that the output voltage of the battery 38 is converted to the inverter 39 and supplied to the corresponding parts. There was a problem that it is very difficult to install and use the product at the construction site lacking electrical equipment such as must.

In addition, a specially designed depth meter interface is required to control the depth pulse generator for measuring the depth of the magnetic field meter, and a special computer capable of mounting the interface has to be provided. .

Accordingly, the present invention for solving the above problems is provided with a flux gate sensor which is inserted into the borehole to detect the induction magnetic field generated from the steel and output as a digital signal, the digital sensing information output from the sensor can be transmitted over a long distance By configuring the RS-422 communication protocol, the highly compatible RS-232 communication protocol and the USB communication protocol that can be supplied to a portable computer such as a notebook computer, only one USB cable can be used. It can be stored and printed out through a portable computer such as a laptop computer, and it can reduce the appearance of the product, and can operate as an embedded battery to measure the depth of foundation regardless of the place. Digitized flux gate sensors can detect and transmit large amounts of data It is an object of the present invention to provide a deep-based depth detection device in which steel is reinforced using a digital three-component flux-gate magnetic field meter, which enables to obtain a measurement value having a very high reliability of the measurement result.

1 to 4 illustrate the present invention for achieving the above object, the preferred embodiment of the present invention with reference to the drawings as follows.

The present invention for achieving the above object

In the device for detecting the depth of the steel 6 placed in the deep foundation (5),

A digital three component that is inserted into the exploration borehole 9 drilled adjacent to the foundation pile 5 and measures the induced magnetic field of the steel 6 placed in the foundation pile 5 and outputs it as a digital signal of RS-232 communication method. A flux-gate sensor 11 and a first converter 12 for converting and transmitting the digital sensing information output from the sensor 11 into an RS-422 communication system capable of long-distance transmission, and inserted into the borehole 9. Sensing means (1) comprising a leak detector (13) for detecting and transmitting a leak of the sensor (11);

A second converter 21 for converting the digital sensing information of the RS-422 communication method transmitted from the first converter 12 into a digital signal of the RS-232 communication method and a cable to which the sensor 11 is connected Depth pulse generator 22 which is installed in the cable support 4 and generates a pulse corresponding to the distance that the cable is inserted into the borehole 9, and the sensor 11 as a pulse generated from the depth pulse generator 22 The portable computer converts the depth pulse generation control unit 23 for calculating and outputting the inserted depth, the output signal of the second converter 21 and the depth measurement signal output from the depth pulse generation control unit 23 into a USB communication standard. (3) a third converter (25) to supply, a leak alarm unit (24) for outputting a predetermined alarm signal when the leak detection information is transmitted from the leak detector (13), and for driving the respective components With battery (26) to supply DC voltage Signal acquisition / processing means 2 configured;

A portable computer (3) for signal processing, storing and displaying the three-component inductance field sensing information and depth information of the USB communication method inputted from the signal acquisition / processing means (2); Characterized in that consisting of.

And, the portable computer 3,

It is characterized in that it is programmed to display the curve of absolute value by vertically differentiating the vertical magnetic field component of the sensed and induced magnetic field so that the maximum value portion of the curve can represent both ends of the steel (6).

Preferably, the signal acquisition / processing means 2 is modularized so that the movement of the place is convenient, and the portable computer 3 uses a notebook computer which is easy to carry.

In addition, the sensing means (1) is formed so that it can be inserted into the borehole (9) within 50mm in diameter, the outside is made of a non-magnetic material so as not to interfere with the measurement of the external magnetic field, waterproofed by O-ring It is desirable to prevent the internal circuits from being damaged by leakage.

Referring to the operation of the present invention configured as described above is as follows.

As shown in FIG. 1, the exploration borehole 9 is drilled in proximity to the foundation 5 (within 2 m), and the cable support 4 is installed at the inlet side of the borehole 9 so that the sensing means 1 is disposed at the end thereof. The connected cable can be inserted into the borehole (9).

In addition, the cable support 4 is provided with a depth pulse generator 22 for generating a predetermined pulse every time the cable passes, and connecting the signal acquisition / processing means 2 to the cable so as to detect the means 1. Induced magnetic field information of the steel (6) detected in the signal processing, and the output side of the signal acquisition / processing means (2) connected to the USB terminal provided in the portable computer 3 to detect the induction magnetic field processed signal The information can be stored and displayed on the portable computer 3.

Referring to the operation of the present invention in more detail as follows.

When the base pile (5) in which the steel (6) is placed is planted in the ground, the steel (6) is magnetized by the geomagnetic field to form an induction magnetic field. Since there is no ferromagnetic material other than the steel 6, the induced magnetic field can be regarded as generated from the steel 6 which is almost reinforced to the foundation pile 5.

Accordingly, the digital three-component flux-gate sensor 11 introduced into the borehole 9 as shown in FIG. 1 senses the induced magnetic field generated from the steel 6 placed in the foundation pile 5 at 200 to 300 times per second to generate RS-. 232 is output as a digital signal of the communication method, the first converter 12 converts the digital signal output from the sensor 11 into a digital signal of the RS-422 communication method capable of a long distance transmission signal acquisition / processing means via a cable Transfer to (2).

The second converter 21 of the signal acquisition / processing means 2 converts the supplied digital sensing signal of the RS-422 communication method into a digital signal of the RS-232 communication method and supplies it to the third converter 25. .

On the other hand, when the sensing means 1 is injected into the borehole 9, the depth pulse generator 22 generates a pulse corresponding thereto and outputs it to the depth pulse generation control unit 23, and the depth pulse generation control unit 23 As the input pulse, the sensing means 1 calculates the input depth and supplies it to the third converter 25.

The third converter 25 converts the digital induction magnetic field sensing information and the depth measurement information into a USB communication method and supplies the digital computer to the portable computer 3 through the USB terminal of the portable computer 3.

In general, the portable computer 3 such as a notebook computer has one USB port, and thus, the portable computer 3 is converted at a high speed by converting the sensing information and the depth measurement information into the USB communication method through the third converter 25. To be able to supply.

In a noisy environment, dozens of measurements are recorded at one depth and statistically processed to obtain high quality data with a high signal-to-noise ratio by averaging only measurements within a specific variance.

The portable computer 3 displays the input induction magnetic field in real time as shown in FIG. 4A, and when the measurement is completed, vertically differentiates the vertical components, takes the absolute value, and outputs the screen as shown in FIG. , So that the maximum value portion of the output curve can represent the bottom depth of the steel (6).

At this time, if the detected digital information is a signal with a lot of noise, the portable computer 3 selects a certain portion of the input information and regresses it with a polynomial of 4 or more orders, and differentiates the analysis function obtained to find a point showing the local maximum value. Both ends of the steel (6) to be judged.

On the other hand, the components constituting the signal acquisition / processing means (2) is driven by the DC voltage output from the battery 26 is built in itself, it is not necessary to provide a voltage conversion device such as a separate inverter.

If water penetrates into the detection means 1 when the detection means 1 is inserted into the borehole 9, the leak detector 13 detects whether the water is leaked and outputs the detection signal to the leak alarm 24. In addition, the leakage alarm unit 24 outputs a separate alarm sound or lights up an alarm light quickly when the leakage detection signal is input, so that the workers quickly raise the detection means 1 and leak the three-component flux-gate sensor 11. To prevent the internal circuits from being damaged.

3 (a, c) shows the vertical and horizontal components of a theoretical induction magnetic field formed by the vertical steel, and FIG. 3 (b, d) shows the two ends of the vertical steel using these vertical / horizontal components. As a technique for determining

When the vertical component of the detected magnetic field as shown in (a) of FIG. 3 is vertically differentiated, and the absolute value is taken, the maximum value present in the upper and lower sides as shown in (b) of FIG. It will represent both ends of.

The thick solid line in the figure means when the distance between the steel and the magnetic field measuring system is 1m, when the thin solid line is 2m and the dashed line is 3m.

In addition, if the horizontal component of the induced magnetic field shown in (c) of FIG. 3 is properly amplified, it is displayed as shown in (d) of FIG. 3, and it can be seen that the maximum and minimum values of the horizontal component represent both ends of the steel 6. have.

Therefore, as the maximum and minimum value positions of the vertical derivatives of the vertical components of the induced magnetic field and the waveforms of the amplified horizontal components coincide with each other, the reliability of the depth measurement result of the steel 6 is improved. It can be applied regardless of the distance between the steel (6) and the borehole (9).

Meanwhile, FIG. 4 illustrates an example of measuring and analyzing an induced magnetic field of steel planted at a real deep depth, and FIG. 4 (a) is a measurement curve shown in real time when measuring data, and (b) of FIG. After the measurement is completed, the vertical derivative of the vertical component is completed.

As described above, the present invention includes a flux gate sensor which is inserted into a borehole to detect an induced magnetic field generated from steel and outputs it as a digital signal, and RS-422 capable of transmitting long distances of digital sensing information output from the sensor. It consists of a communication protocol, a highly compatible RS-232 communication protocol, and a means of converting it into a USB communication protocol that can be supplied to a portable computer such as a notebook computer, so that only one USB cable has information detected by the flux gate sensor. It can be stored and printed out through a portable computer such as a notebook computer, can reduce the appearance of the product, and can operate as a built-in battery to measure the depth of the foundation wherever it is, and the digitized flux Gate sensors quickly detect large amounts of data and process it Therefore, the effect of providing a depth-based depth detection device based on steel using a digital three-component flux-gate magnetic field meter to obtain a highly reliable measurement value by minimizing the influence of noise can be expected. have.

Claims (2)

In the device for detecting the depth of the steel 6 placed in the deep foundation (5), A digital three component that is inserted into the exploration borehole 9 drilled adjacent to the foundation pile 5 and measures the induced magnetic field of the steel 6 placed in the foundation pile 5 and outputs it as a digital signal of RS-232 communication method. A flux-gate sensor 11 and a first converter 12 for converting and transmitting the digital sensing information output from the sensor 11 into an RS-422 communication system capable of long-distance transmission, and inserted into the borehole 9. Sensing means (1) comprising a leak detector (13) for detecting the leak of the sensor (11) and transmitting the detected information through the first converter (12); A second converter 21 for converting the digital sensing information of the RS-422 communication method transmitted from the first converter 12 into a digital signal of the RS-232 communication method and a cable to which the sensor 11 is connected Depth pulse generator 22 which is installed in the cable support 4 and generates a pulse corresponding to the distance that the cable is inserted into the borehole 9, and the sensor 11 as a pulse generated from the depth pulse generator 22 The portable computer converts the depth pulse generation control unit 23 for calculating and outputting the inserted depth, the output signal of the second converter 21 and the depth measurement signal output from the depth pulse generation control unit 23 into a USB communication standard. (3) a third converter (25) supplied to the water, a leak alarm unit (24) for outputting a predetermined alarm sound when the leak detection information is transmitted from the leak detector (13), and for driving the respective components Consists of a battery (26) to supply DC voltage Signal acquisition / processing means (2); A portable computer (3) for signal processing, storing and displaying the three-component induction magnetic field sensing information and depth information of the USB communication method inputted from the signal acquisition / processing means (2); Depth detection device of the deep foundation is iron-based using a digital three-component flux-gate magnetic field meter, characterized in that consisting of. The method of claim 1, The portable computer 3, Dozens of magnetic fields are measured at one depth and statistically processed to select a reliable representative value that maintains a high signal-to-noise ratio.At the same time, the curve obtained by taking an absolute value by vertically differentiating the vertical magnetic field components of the induced and induced magnetic fields is obtained. The maximum value of the curve is programmed to display both ends of the steel (6), and in the case of recordings with a lot of noise, regression analysis of a certain part of the magnetic field signal by 4 or more polynomials A depth-based depth detection device with a steel reinforcement using a digital three-component flux-gate magnetic field meter, characterized in that it is programmed analytically to find its maximum.

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