KR20070087867A - The test apparatus for security of neighboring building according to subway driving from a remote server - Google Patents

Abstract

A testing apparatus for security of a neighboring building according to subway driving from a remote server is provided to effectively solve the problems caused by the vibration of subway by quantitatively estimating the damage of structures. A testing apparatus for security of a neighboring building according to subway driving from a remote server comprises a sensor unit(100), an analog-digital converter(210), a field server(200), and a remote server(300). The sensor unit sets a predetermined subway driving section on a railroad, and measures an acceleration signal according to the subway driving. The analog-digital converter converts a sensor output signal to a digital signal. The field server converts the acceleration signal to a velocity and/or displacement signal, and transmits the signal to a remote place. The remote server compares and analyzes the signal transmitted from the field server with a reference subway vibration value based on the signal, and measures and monitors the security of the neighboring building.

Description

The test apparatus for security of neighboring building according to Subway Driving from a remote server}

1 is a view showing briefly that the installation of the adjacent building safety measuring apparatus according to the present invention in the subway.

2 is a block diagram illustrating an apparatus for measuring safety of an adjacent building according to a subway running from a remote server according to the present invention.

3 is a data flow diagram of a device for measuring the safety of an adjacent building according to the subway running from a remote server according to the present invention.

<Description of the symbols for the main parts of the drawings>

100: sensor unit 200: field-side server

210: A / D converter 220: field side control unit

203: field side transmitter / receiver 300: remote side server

310: remote side transmitter / receiver 320: remote side control unit

330: Memory 340: Display

350: keypad

The present invention relates to a device for measuring the safety of a neighboring building according to the subway running from a remote server. In particular, it is possible to remotely measure the safety of a neighboring building according to the subway using a cheap acceleration sensor without using an expensive sensor. It is about a device that can be made.

The number of complaints related to damage to nearby structures is increasing due to the vibration caused by the subway or the vibration generated at the construction site. In order to measure / evaluate this, the existing portable vibration level meter (Portable vibration level meter) The worker who had a resident stayed at the site of complaint for a certain time and measured / evaluated it. However, since these vibration sources occur 24 hours, the maximum value of the operator's measurements does not represent the maximum value of the entire vibration, and the maximum value may occur in the non-measured time zone, such as at night. It is becoming.

Since the international damage scale of subway or construction site vibration is a speed or displacement signal, a moving coil type sensor for expensive vibration velocity measurement should be used instead of a piezo sensor, which is a general acceleration measurement sensor, and a dynamic signal such as a vibration signal. In order to perform continuous measurement and to monitor remotely, expensive Dynamic Data Logger should be used. For this reason, it is difficult to proactively and effectively respond to civil complaints caused by the vibration damage of subways and construction sites, and economic problems are emerging.

The present invention has been made to solve the above problems, and its object is to use a cheap acceleration sensor and a controller-based signal processing program without using an expensive moving coil type sensor for measuring vibration speed. Real-time monitoring system is implemented to measure the vibration acceleration of adjacent structures caused by the vibration generated when traveling on the subway and convert it to speed and displacement, which is an international (domestic) standard measure of the structure, to quantitatively evaluate the degree of damage of the structure. Effective resolution of complaints related to structural damage.

In addition, an object of the present invention is to remotely transmit the data converted into the speed and displacement to be able to grasp and act on the site status in real time remotely.

In order to achieve the above object, the adjacent building safety measuring device according to the subway running from the remote server according to the present invention, an acceleration sensor for setting a predetermined subway driving section of the railway running subway and measuring the acceleration signal according to the subway driving Sensor unit comprising a; An analog-digital converter for converting the sensor output signal into a digital signal; A field-side server converting an acceleration signal, which is an output signal of the analog-digital converter, into a speed and / or displacement signal, and transmitting the signal to a remote location; And a remote server that receives the signal transmitted from the field server and compares and analyzes the standard subway vibration value based on the signal to measure and monitor the safety of the adjacent building.

In addition, the present invention is characterized in that the remote side server transmits the safety measurement result of the adjacent building to the site side server so that the site operator can monitor and take follow-up measures.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First, the present invention will be described with reference to the domestic and overseas allowable structure vibration reference (allowed value) with reference to Tables 1 to 4.

First, look at the domestic standard vibration criteria are shown in Table 1 and Table 2.

Table 1-Maximum allowable ground vibrations (DIN 4150 draft) depending on the condition of the building

Ground speed Application mm / sec dB 2 106 Historic sites that are very valuable but very old buildings 5 114 Defective brick building, such as visible cracks 10 120 Structurally very stable building without small defects 10-40 120-132 Very strong buildings, such as industrial buildings with reinforced concrete or steel

<Table 2> Vibration Velocity Standards for Seoul and Busan Subway

Rating Kind of building Speed tolerance mm / sec f≥30Hz f <30Hz I Cultural property (historically very old building) 2.0 1.5 Ⅱ Old buildings (apartments, malls), houses, hospitals, small cracks or defects sensitive to vibration 3.0    4.0 5.0 2.0    2.5 3.5 Ⅲ Good general building without cracks due to housing, apartments, malls etc.  5.0-7.0  3.5-5.0 Ⅳ Reinforced concrete reinforced building for industrial facilities 10.0-30.0 5.0-20.0

Second, Table 3 and Table 4 show the vibration allowance and vibration damage of structures in major overseas countries.

<Table 3> Vibration Tolerance of Structures of Major Overseas Countries

Major countries Type of building Speed or displacement tolerance  Germany (DIN 4150Z) Cultural assets such as ruins or old remains 0.2cm / sec Defective building, such as cracks 0.5cm / sec Defect-free building 1.0 ~ 4.0cm / sec Industrial concrete structures without walls 1.0 ~ 4.0cm / sec Austria (CA-23, 1967) For vibrations with frequencies below 15 Hz 0.02 cm For vibrations with frequencies above 15 Hz 1.9 cm / sec  England Tunnel blasting in densely populated areas 1.0 cm / sec Tunnel blasting in sparsely populated areas 2.5cm / sec Open-air coal mine with frequency below 12Hz 1.2 cm / sec Etc 0.5cm / sec

<Table 4> Building Damages According to Vibration Levels

1 is a view showing briefly that the installation of the adjacent building safety measuring apparatus according to the present invention in the subway.

Referring to FIG. 1, an acceleration sensor (shown in a circle) or the like installed in one or more subway running sections A may be provided.

Although the installation position of the acceleration sensor may be anywhere in the driving section A, it is preferable that the acceleration sensor is installed in the railway line 2 to which the subway 1 runs or in a structure in which damage by vibration is expected.

2 is a block diagram illustrating an apparatus for measuring safety of an adjacent building according to a subway running from a remote server according to the present invention.

Referring to FIG. 2, an adjacent building safety measuring apparatus according to the present invention includes a sensor unit 100, a field server 200, and a remote server 300.

In the present invention, the field server 200 and the remote server 300 may be regarded as a kind of computer. However, the general computer may include algorithms for converting acceleration into speed and displacement, and algorithms for determining whether the converted speed and displacement values comply with national and international standards. The description is made in more detail below.

The sensor unit 100 includes an acceleration sensor and the like, and a detailed description of the sensor is made in FIG. 1 and will not be described herein.

The field server 200 includes an analog-to-digital converter (ADC) 210, a field controller 220, and a transmitter / receiver 230. In addition, although not shown, the field server 200 may also include a display unit, a memory unit, a keypad, and the like provided in the remote server.

The analog-to-digital converter (ADC) 210 converts the sensor unit output signal into a digital signal. The converted digital signal is a vibration acceleration signal.

The field-side control unit 220 converts the vibration acceleration signal, which is an output signal of the analog-to-digital converter (ADC) 210, into a speed and / or displacement signal.

The analog-to-digital converter (ADC) 220 may be included in the field-side server 200 as shown in FIG. 2, but may not be included in the field-side server 200.

The field-side transmitter / receiver 230 transmits the vibration speed and / or displacement signal converted by the field-side controller 220 to the remote-side server 300 (more specifically, 'receiver of the remote-side server'). Send it to. In addition, the field-side transmitter / receiver 230 also receives data from the transmitter / receiver of the remote server 300 and transmits the data to the field-side controller 220.

The remote server 300 includes a remote transmitter / receiver 310, a remote controller 320, a memory unit 330, a display unit 340, and a keypad 350.

The remote side transmitter / receiver 310 plays a role of exchanging data with the field side transmitter / receiver 230.

The data transmitted from the field server 200 is stored in the memory unit 330, and the data analyzed by the algorithm as well as the algorithm to analyze the data and the control algorithm information of the remote controller are stored.

The display unit 340 displays the detection data (acceleration signal) of the sensor unit, the converted speed and displacement signals, and the analysis data of the detection information through data analysis algorithms numerically or graphically under the control of the remote control unit 320. Displays various control operation status.

The data analysis algorithm includes an algorithm for determining whether or not the speed and displacement signals detected and converted by the sensor unit 100 conform to (standard) the standard subway vibration value (a neighboring building safety measurement algorithm according to subway driving). Say.

The keypad 350 is provided with various function keys for the remote server operator to control function selection, wireless information reception, and information transmission through the communication port.

The remote control unit 320 communicates with the field server 200 to receive data (speed and displacement signals) transmitted from the field server 200 and converts the received data into numerical data and data by the data analysis algorithm. Graphical data is used to control display and save.

3 is a data flow diagram of a device for measuring the safety of an adjacent building according to the subway running from a remote server according to the present invention.

1 to 3, in the present invention, the acceleration sensor is installed in a predetermined section A in which the subway travels (S101) to measure the acceleration. (S102)

Then, the analog-to-digital converter 210 converts the sensor output signal into a digital signal (S103), and then converts the digitized vibration acceleration signal into a vibration velocity and displacement signal (time domain integration and frequency domain integration) ( S104 and S105 are converted into speed and displacement signals. (S106) Then, the vibration speed and displacement signals are transmitted to the remote server 300 by the field-side transmitter / receiver 230. (S107) Then, the control unit of the remote server may measure the risk of the adjacent building due to the subway driving using the data analysis algorithm.

In the exemplary embodiment of the present invention, the vibration acceleration signal, which is a sensor output signal, is converted into a vibration speed and a displacement signal in the field server, but this operation may be performed in the remote server 200.

In addition, although briefly described in the description of FIG. 2, in the present invention, the result of the safety measurement of the adjacent building carried out by the remote side server 300 is transmitted to the field side server 200 to monitor the field worker to follow up. Can be taken.

Next, an algorithm for converting an acceleration signal applied to the present invention into a speed and displacement signal will be described.

That is, in the present invention, after measuring the acceleration at the position to measure the dynamic displacement of the subway, the displacement is calculated using the following signal processing technique.

(A) integration of the time domain

If the measured acceleration record is a (t), the velocity component is expressed as in Equation (1).

Integrating equation (1), the displacement component x (t) is equal to equation (2)

Among the displacement components of Eq. (2), if the terms based on the measured acceleration recording and the terms based on the initial conditions are displayed separately, the estimated displacement is as shown in Eq. (3).

 That is, when the initial condition is 0, the displacement response may be obtained by integrating only the acceleration signal measured as in Equation (4).

(B) the frequency domain is integrated

The Fourier transform of the acceleration response measured from the definition of the Fourier transform can be obtained and divided into a Fourier sine transform and a Fourier cosine transform as shown in Equation (6).

In order to find the displacement response from the Fourier transform of the measured acceleration record, the derivative theorem of Eq. (7) is introduced and substituted into Eq. (6).

The relationship of equation (8) can be derived.

here,

From the Fourier transform of the measured acceleration signal, equation (8-b) can be used to obtain the Fourier transform X (ω) of the displacement response, and the displacement response x (t) in the time domain is obtained from the Fourier inverse transform of equation (9). Can be.

As described above, with reference to the preferred embodiment of the present invention, those skilled in the art will be variously modified and modified within the scope of the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated that it can be changed.

As described above, the present invention uses an inexpensive acceleration sensor and a controller-based signal processing program without using a moving coil type sensor for measuring the vibration speed of an expensive structure to evaluate the influence of nearby structures caused by subway vibration. By monitoring the vibration of adjacent structures due to the vibration generated during subway running, and converting them into speed and displacement, which are international standard measures of the structure, to quantitatively evaluate the degree of damage of the structures. Effectively resolve related complaints.

In addition, by remotely transmitting the signal converted into the speed and displacement, it is possible to grasp the site status in real time from the remote, thereby improving the ability to cope with the site.

Claims (2)

A sensor unit including an acceleration sensor configured to set a predetermined subway driving section of the railroad track and measure an acceleration signal according to the subway driving; An analog-digital converter for converting the sensor output signal into a digital signal; A field-side server converting an acceleration signal, which is an output signal of the analog-digital converter, into a speed and / or displacement signal, and transmitting the signal to a remote location; And Adjacent building safety according to the subway running from a remote server including a remote server that receives the signal transmitted from the field server and compares and analyzes the standard subway vibration value based on the signal to measure and monitor the safety of the adjacent building Measuring device. The method of claim 1, wherein the remote site server transmits the safety measurement result of the adjacent building to the site server so that the site operator can monitor and take follow-up measures. Degree measuring device.

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