KR19990080158A - Automatic device for measuring tilt displacement using serial communication and its method - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for automatically measuring and measuring a plurality of inclination sensors using serial communication. In general, inclined displacements and grounds of various structures due to the influence of ground motion and vibration in civil engineering works such as roads and bridges Applied to measure and manage horizontal displacements.

In particular, the present invention relates to an automatic device for measuring inclined displacement using serial communication, which is applied to the detailed measurement of underground horizontal displacement, that is, inclined displacement of underground soil.

The system configuration for automatically measuring the plurality of inclination sensors are inclined gages for inserting the inclination sensors into the basement, sensor connecting rods for positioning the sensors at regular intervals into the inclination gages, and connecting rods along the grooves inside the inclinometers A guide attached to the connecting rod for retracting, a signal conversion unit for transmitting data converted from the inclination sensor to digital, and a serial communication method, a sensor control unit for receiving and storing this data in serial, It is characterized by comprising a main computer that receives the measurement data by the sensor control unit for analysis and information.

Therefore, it is possible to easily and easily measure the horizontal displacement of the ground at the civil engineering site, and digital conversion is performed directly at the inclination sensor, so that it can be transmitted without the loss due to long lines, thereby achieving high precision civil measurement.

Description

Automatic device for measuring tilt displacement using serial communication and its method

The present invention relates to an automatic measuring device for automatically measuring the amount of inclination displacement by controlling a plurality of inclination sensors using serial communication, in particular applied to the field for measuring in detail the amount of inclination displacement of underground soil, that is, the horizontal horizontal displacement. The present invention relates to a device for automatically measuring a displacement amount of a displacement using a serial communication in which a narrow and long inclinometer is buried underground and a large number of inclination sensors are inserted into a certain depth.

In general, it is also necessary to measure and manage the amount of displacement of various structures and ground caused by the influence of ground behavior, wind power, vibration, etc. in civil engineering works such as roads, bridges, ports, and dams.

The conventional method of measuring underground horizontal displacement in civil engineering, that is, the amount of inclined displacement caused by the ground, can be measured manually by manually inserting a probe with a tilt sensor at the end of a tape measure by inserting it into the plastic tilt gauge. It was a cumbersome task that required personnel.

As described above with reference to Figure 1 a typical inclinometer measuring method for measuring the amount of underground horizontal displacement commonly used in civil engineering sites as follows.

Take the measuring cable 13 marked with depth in 0.5 meter length from the cable storage drum 14 and insert the measuring probe 11 with the tilt sensor at its end into the 50 mm wide plastic inclinometer 12 Insert the roller wheel 10 into (Fig. 3B, 31 and 32) and insert it into the unit 0.5 meter by hand and at the same time while measuring the tilt while pressing the instrument logger (15) with one hand.

Since the measuring equipment has a cable length of 50 meters or more, the weight is heavy and it cannot be lifted with one hand, and it is expensive and is used to rent each other for each civil site.

The conventional measurement method, which is a little more improved than the conventional method, may include a method of measuring a plurality of inclination sensors made in the same shape as the conventional probe 11 into the inclinometer 12 by line by measurement depth. In this case, as shown in FIG. 4B, the signal lines 41 of each sensor are all gathered in one place and concentrated on the measuring device 40, so that the line is very complicated and wiring is difficult.

Since many such lines have to pass through the narrow diameter 50 mm inclination tube 12, there is a limit of the quantity of the inclination measurement probe 11 into the inclination tube, and the price is very disadvantageous. In more detail, since six lines 41 are provided per sensor, 120 signal lines are provided even when 20 inclination sensors are installed. Therefore, the number of sensor installations cannot be increased.

Such prior arts have many limitations and limitations in measuring tilt displacement in civil engineering applications.

As described above, in the field of civil engineering in the related art, despite the urgent need for automatic control and high-precision measurement in view of various working conditions, the conventional method still relies on the low-precision manual measurement of the conventional method.

The technical problem to solve this problem is to reduce the control line and to digitize the output signal of the sensor in the sensor itself to configure the system suitable for the measurement work conditions for inclined measurement automation, and the measurement data to the main communication It's a technology that delivers to a computer.

The present invention has been made in view of the above-described problems of the prior art, the object of which is to convert the underground horizontal displacement of the ground that can occur when excavation underground for civil engineering-related construction into an electrical signal, serial communication It is an object of the present invention to provide a device for automatically measuring tilt displacement, which can automatically measure tilt displacement in a remote location.

Still another object of the present invention is to permanently measure the change in the slope of a civil structure due to an external natural environment or poor construction, not permanently, and to permanently fix a measurement sensor to a measurement point at a measurement site, and use a data communication line. By measuring the amount of displacement of the structure automatically in the office, it provides an automatic method of measuring the amount of displacement of the displacement to permanently measure the amount of displacement until the life of the structure permanently, regardless of the measurement time and place.

1 is a schematic cross-sectional view showing a conventional manual tilt displacement measuring device,

Figure 2 is a schematic cross-sectional view showing a device for automatically measuring the displacement amount in accordance with the present invention,

3A is a schematic view of a guide for inserting a tilt sensor into an inclinometer;

3B is a cross-sectional view of the inclinometer with guide grooves,

Figure 4A is a block diagram connecting the inclination sensor according to the present invention,

4B is a schematic diagram of a track connecting the inclination sensor conventionally;

5A is a detailed block diagram of an inclination sensor signal converter according to the present invention;

5B is a detailed block diagram of a sensor controller according to the present invention;

6A is a flowchart of a signal conversion unit shown in FIG. 5A;

6B is a flow chart of the sensor controller shown in FIG. 5B;

7A is a serial communication protocol for transmitting to a sensor signal converter;

7B is a serial communication protocol received by a sensor controller.

(Explanation of symbols for the main parts of the drawing)

10; Rolla wheel 11; Probe

12; Inclinometer tube 13; Measuring cable

14; Cable drum 15; Manual measuring instrument

20; Signal converter 21; Connecting rod

22; Spring plates for guides 23; Guide protrusion

24; Serial sensor measuring line 25; Sensor control unit

26; Serial main communication line 27; Main computer

30; Spring plate projections 31,32; Inclinometer Home

40; Conventional instruments 41; Conventional signal line

42,53; Inclination sensor 50; A / D converter

51; Microprocessor for conversion 52; RS-485 converter

53; Display panel (L C D) 54; Microprocessor for control

55; Memory 56; Nonvolatile Memory (EEPROM)

57; Serial Transceiver Driver

In order to achieve the above object, the present invention, the inclination tube for inserting the inclination sensor into the basement, the sensor connecting rod for positioning the sensor at regular intervals into the inclination system, and picking up the connecting rod along the groove inside the inclination system A guide attached to the connecting rod for input, a signal converting means for transmitting data converted from the inclination sensor into a digital signal by serial communication method, a sensor control means for receiving and storing this data in serial, The present invention provides an automatic tilt displacement measuring apparatus and method comprising a main computer for receiving and analyzing measurement data.

In addition, according to another feature of the present invention, in the inclination displacement measuring method using the inclinometer, inclination sensor, sensor connecting rod, signal conversion unit, sensor control unit and the main computer to measure the horizontal horizontal displacement amount,

Instructing, by the sensor control unit, the A / D conversion of the inclination sensor to each signal conversion unit using a serial communication protocol method;

A signal conversion unit which monitors and waits for a serial communication line at all times, recognizes its own address, performs A / D conversion, and transfers the converted digital data to a signal controller through a serial communication method;

Storing the collected data by the serial communication method, displaying information such as measurement time and stored state on the display panel, and transmitting the collected data to the main computer;

The present invention provides a method for automatically measuring tilt displacement, which analyzes, plots and informatizes data in a received main computer.

According to the present invention, the main computer is located in the office and can perform automatic measurement unattended, and the modem can be connected to the remote central computer communication network, so that the measurement data processing is more rapid regardless of time and place. And convenient.

(Example)

Hereinafter, with reference to the accompanying drawings showing a preferred embodiment of the present invention described above in more detail.

2 is a schematic cross-sectional view showing a device for automatically measuring a displacement amount according to the present invention, FIG. 3 is a schematic diagram of a line connecting the inclination sensor, FIG. 4 is a schematic diagram for inserting the inclination sensor into the inclination system, and FIG. FIG. 6 is a flowchart illustrating a control circuit of FIG. 5, and FIG. 7 is a serial communication protocol between a sensor signal converter and a sensor controller.

First, the flow of operation of each part of the present invention will be briefly described. When the inclination tube 12 embedded in the ground is inclined with the ground, there is a change in the output voltage of the inclination sensor 53 in the inclination system, and the signal is digital. The sensor control unit 25 arrives and is stored as a digital signal via a signal conversion unit 20 having a built-in inclination sensor. The sensor control unit collects inclination displacement data of all sensors and sends them to the main computer 27 via RS-232 communication. Therefore, the main computer can analyze and informatize this measurement data. The inclination sensor 53 may use the well-known inclination sensor 42 or the inclination sensor proposed by the present applicant in the patent application Nos. 97-18936 "Anti-angle measuring transducer using the capacitance of the bridge circuit and its method". have.

Then, referring to FIG. 2 as an installation example, the quantity of the measurement point is selected for the signal conversion unit 20 in which the inclination sensor 53 is incorporated, and a predetermined distance (about 0.5-2 meters) is provided therebetween. The connecting rod 21 is connected between the signal conversion units 20 to maintain the installation depth of the gap, and the signal line 24 is connected to the last sensor unit through the inside of the connecting rod. Typically, the total length of this connection is about 20-30 meters, although it varies slightly between civil sites.

When assembled as described above, the guides (Figs. 3A, 23 and 30) are matched with the grooves (Figs. 3B, 31 and 32) of the plastic inclined tube 12 having a diameter of about 50 millimeters and pushed to the end of the inclined tube and the inclined tube lid ( 28) Close and seal.

The signal line 24 from this inclination tube is connected to the sensor control part 25, and the data line 26 from the control part is connected to the main computer 27, and a system is completed.

When the system is applied to civil engineering structures, the sensor signal converter 20 may be separated and attached to measurement points at regular intervals, thereby simplifying configuration.

The guides 22, 23, and 30 for inserting the inclination sensor signal converter 20 into the inclination tube 12 will be described in more detail with reference to FIG. 3.

The guide has two widths of 4 mm groove support protrusions 23 at intervals of 120 millimeters so as to descend along the inclination tube grooves (FIGS. 3B and 31). On the opposite side, the spring iron plate 22 having a width of 4 mm and a length of 120 mm is pushed so that the protruding portion 30 slides in close contact with the groove 32. This guide system, once installed, can be said to be much more stable than conventional roller wheels 10, which must be moved from time to time, in view of the features of the present invention, which are automatically and permanently measured. In addition, by connecting the connecting rod 21 and the inclination sensor signal conversion unit 20 subsequent to the connecting method, in order to ensure that the movement does not move to make a screw thread at the end of the connecting rod 21, or fixed by fixing pins All tilt sensor signal converters can be tilted together. However, the length of the connecting rod 21 is set to the same length (about 0.5 m or less) as the manual measuring probe 11 so as to be able to flexibly move back, forth, left and right as in manual measurement, and the connecting portions are joined to each other in a round spherical shape, respectively. The sensor may be connected to the inclination sensor signal converter 20 to move easily.

The serial communication method, which is a representative feature of the present invention, will be described below with reference to FIG. 4. Unlike the conventional method, this system can be easily configured with two lines 24 from the sensor control unit 25. These two lines adopt RS-485 communication method and the communication distance is several kilometer.

RS-485 communication supports multi-point mode. Multi-point refers to a standard that allows multiple devices to be connected to one line, each device is assigned a unique address, and then a host can transmit and receive a desired device.

In order to apply the above method, a sensor signal conversion unit (FIGS. 5A and 20) capable of A / D conversion (Analog to Digital Conversion) of each inclination sensor 42 and digitalization of the inclination displacement amount to manage serial communication is required. . This serial communication system can realize high-precision civil engineering measurement that could not be realized by the conventional system that requires many lines 41 as shown in FIG. 4B.

Referring to Figure 5 when explaining the inclination amount automatic measuring apparatus using serial communication as follows.

FIG. 5A illustrates an inclination signal converter 20 incorporating an inclination sensor 53 and digitally converting a signal. When a direct current voltage is applied to the inclination sensor 53, a voltage change occurs according to a change in inclination. In order to send to the sensor control unit 25 in the serial communication, the A / D converter 50 is passed through, and the microprocessor 51 receives the conversion data and the RS-485 converter 52 in accordance with the serial communication protocol for RS-485 communication. The data is transmitted to the sensor controller 25 through.

FIG. 5B is a sensor control unit 25 for controlling the respective inclination sensor signal conversion units 20 located inside the inclination tube 12 to comprehensively receive the inclination displacement data, and is received through the RS-485 converter 52. When the received data is sent to the microprocessor 54, the reception status is displayed on the display screen 53, the displacement amount of each sensor received in the memory storage device 55 is stored, and in the nonvolatile memory 56, the sensor address, Save constant data such as communication standard.

In addition, information is exchanged with the main computer 27 through the serial transmission / reception driver 57 in an RS-232 manner.

FIG. 6 is a flowchart illustrating a program of the microprocessor 51 in the sensor signal converter 20 and the microprocessor 54 in the sensor controller 25.

FIG. 6A is a flowchart of a macro processor of a signal conversion unit. In detail, when the power is supplied and the operation is started, the inclination sensor is called to request the sensor data transmission from the sensor controller while the RS-485 communication port is in the standby state for input. If the signal is not confirmed, the standby state is repeatedly maintained (step S61). If there is a call signal, it is checked whether it is my sensor address (step S62). If the inclination sensor displacement amount request of the My Address is performed, the A / D conversion operation is performed (step S63). The converted data is stored in the memory (step S64), the data is transmitted by RS-485 communication (step S65), and the operation is terminated after confirming the data reception completion signal of the control unit. In order to save transmission and reception time, the confirmation operation may be omitted.

6B is a flowchart of a macro processor of a sensor controller, which will be described in detail. When power is supplied to the controller and the operation is started, the controller call signal is waited at the sensor signal conversion unit while the RS-485 communication port is input (step). S67). If there is a control unit call signal, the transmission sensor address checking operation is performed (step S68). After the confirmation operation, the reception data and measurement time are stored in the memory (step S69), the reception completion data is sent out (step S70), the reception status is displayed on the display screen LCD (step S71), and the measurement of all installed sensors is performed. Upon completion, the data transfer operation is performed to the main computer (step S72).

7 illustrates a serial communication standard (protocol) between the sensor signal converter 20 and the sensor controller 25. This is described as follows.

FIG. 7A is a protocol for calling a signal converter of a sensor measured by a sensor controller, the first 16 bits of which transmits two characters of ASCII codes as signals for calling a tilt sensor, and then receives a received sensor address. Send the number 8 bits. The following 8 bits are the inverted signals inverting the sensor address, that is, 1 is 0 and 0 is 1, which is a signal for preventing transmission / reception errors and may be omitted to save transmission / reception time.

7B is a protocol for transmitting the measurement result data from the sensor signal conversion unit to the sensor control unit. The first 16 bits are signals for calling the sensor control unit, and transmit two characters (ASCII) in ASCII code, and then transmit sensor address. The number 8 bits and the inverted 8 bits are sent in succession. The next data is the four digits of the measurement result, a total of 32 bits of data, followed by an invert signal. Again, the inverted signal can be omitted to save transmission and reception time.

For example, if the transmission / reception signal is expressed in ASCII code, it can be expressed as follows. That is, the sensor transmission code of FIG. 7A may be represented by “SN 01 FE”, and the gradient result receiving code of FIG. 7B may be represented by “MH 01 FE 31 32 33 34 AE AD AC AB”.

As described above, in the present invention, it is possible to perform a fully automated information construction and civil engineering measurement, instead of the manual conventional civil measurement, in the measurement of the horizontal and horizontal displacements of structures and underground soils at the civil construction site.

Briefly, the effect of the invention is described as follows.

As a first effect, the control line from the tilt sensor is reduced to only 2 lines from the conventional method, which required at least dozens of lines, so that precise measurement can be automatically performed using many sensors even in the field where there is no space for installation.

Second, since the A / D conversion of the inclination displacement is converted to digital signal by outputting A / D at the stage immediately after the sensor signal, it is generally more accurate and lossless than the conventional method of dragging a line over 30 meters and converting the signal. have.

Third, the individual inclination sensor can be made small, and the built-in conversion control circuit is built in, so that additional equipment such as a roller wheel for manual measurement is unnecessary, so that it can be manufactured at a low cost, and the installation is simple and costly. Very savings.

Fourth, it is not a conventional method of measuring while moving the measuring instrument with tilt sensor, but it can be installed as a measuring facility fixed in one place, so it is possible to make a long-term permanent measurement and is suitable for permanent safety inspection of civil structures.

Fifthly, since it is fixedly installed at the measurement point, the measurement error caused by measuring and shifting once and then moving again at the next measurement time can be reduced as in the conventional measurement method.

In addition, as a last effect, the measurement time is shortened automatically because it is measured at a long distance, and labor costs are saved because there is no need for a separate measurement personnel, and a larger effect is that the current measurement data is quickly input into a computer, which enables information-based measurement management. Innovative contributions to civil engineering surveys can be made.

While the present invention has been illustrated and described with reference to certain preferred embodiments, the invention is not limited to the above embodiments and is commonly understood in the art to which the invention pertains without departing from the spirit of the invention. Various changes and modifications may be made by those who have.

Claims (6)

An inclination sensor that outputs a voltage or a current according to the inclination displacement; Signal conversion means for converting the signal from the inclination sensor into digital and transmitting the conversion data by serial communication; Sensor control means for receiving and storing the converted measurement data in serial; It is composed of a main computer that receives the measurement data from the sensor control unit to analyze and inform information. The apparatus of claim 1, wherein the inclination sensor control unit and each inclination sensor signal converter are connected to a serial communication line to collect data in a multi-point manner. The apparatus for automatically measuring tilt displacement according to claim 1, further comprising embedding a tilt gauge and inserting a tilt sensor therein as a means for measuring the underground horizontal displacement amount in the underground ground. According to claim 3, Protruding portion and the support spring plate attached to the inclined sensor side or connecting rod side for connecting to maintain the inclined sensor at regular intervals so that the inclined sensor can fit into the groove in the inclined tube. Slope displacement automatic measuring device further comprising. An inclination sensor in which an output signal changes according to an inclination displacement amount; An A / D converter that converts the signal output from the tilt sensor into digital, Control means for controlling the A / D converter and storing the converted data; An inclination sensor displacement detection and conversion circuit comprising a serial converter for transmitting and receiving data to or from a main computer or other storage device. In the method of automatic measurement of inclination displacement composed of inclination sensor to measure underground horizontal displacement, sensor connecting rod, sensor connecting rod, inclination sensor signal conversion unit, sensor control unit and main computer for analyzing measurement data Instructing, by the sensor control unit, the A / D conversion operation of the inclination sensor to each signal conversion unit using a serial communication protocol method; A signal conversion unit which monitors and waits for a serial communication line at all times, recognizes its own address, performs A / D conversion, and transfers the converted digital data to a signal controller through a serial communication method; Storing the collected data by the serial communication method, displaying information such as measurement time and stored state on the display panel, and transmitting the collected data to the main computer; A method for automatically measuring tilt displacement, characterized in that the data is analyzed, plotted, and informed by the transmitted main computer.