KR20070099815A - Alarm detection method and device of tower crane - Google Patents

Abstract

An alarming method of danger detection in a tower crane and an apparatus thereof are provided to alarm potential damage or danger in a tower crane by comparing measured wind, wind pressure on a truss structure, and displacement of the tower crane due to weather condition etc. with reference data, displaying the current structural safety state as images, and transmitting the images to an assistant driver on the ground and a field office through a wireless network. An alarming method of danger detection in a tower crane includes the following steps of: inputting basic data about a truss structure of a tower crane(S100); installing a wind direction meter and a wind speed meter on a cat head after fixing a plurality of slope sensors on a mast and a cat head at proper intervals to gather data corresponding to the basic data(S200); detecting electrical signals having information, wind pressure acting on the truss structure, displacement due to main jib movement, and weather data measured from the wind direction meter and the wind speed meter(S300); transforming analog signals into digital signals through an A/D(Analog to Digital) converter by amplifying and filtering the electrical signals for a central processing unit to operate the digital signals(S400); determining structural safety by comparing the measured information data with reference values and analyzing/interpreting the detected data(S500); outputting the results from the previous step on a display device and storing them in a server prepared at a driver seat(S600); transmitting the image data outputted in the previous step to an assistant driver on the ground and a field office through a wireless network(S700); and operating an alarming sound and lamp till an alarm canceling signal is inputted if the state is out of a permitted safety range(S800).

Description

Danger detection alarm method and apparatus thereof for tower cranes {.}

1 is a risk detection alarm flow chart of the present invention

2 is a front view of the tower crane to which the present invention is applied

Figure 3 is a block diagram of a risk detection alarm device of the present invention

4 is a view showing a screen on which a behavior state is displayed according to the present invention;

5 is a view showing the number of times the section in which the main jib is rotated by the present invention on the screen

FIG. 6 is a diagram illustrating a screen displaying a graph of a driving state for each section according to time according to the present invention. FIG.

* Explanation of symbols for the main parts of the drawings

10: main server 11: input unit

12 control unit 13 memory

14 video signal processor 16 alarm unit

20: measuring unit 30: the first management server

40: second management server

The present invention relates to a method for detecting and alerting to a dangerous state of a tower crane, and more specifically, to measure and grasp the behavior of deformation of a tower crane, and to breakage due to deformation of the tower crane based on the identified data. Automatically detects dangers and notifies workers, riggers and managers to visually recognize safe tolerances for variable variations in tower cranes, as well as those on board cranes, as well as remote assistance It relates to a method for detecting the danger of a tower crane that allows the managers of the riggers and the field office to monitor the deformation of the tower crane in real time and establish safety measures.

Tower cranes are installed on the ship's fleet and quay walls for port unloading, or in bulk construction and spool holding in high-rise buildings, apartment construction sites, and plant construction. It is widely used, and it is divided into jib type and hammer head type according to the shape of the top part, and the jib type has a rotating frame installed at the top of the tower, and the jib is a rotary motion or trolley. In order to raise or lower the cargo by the linear movement of the hammer, the hammer head type is equipped with a swing frame at the top of the tower and a boom that equips it to the left and right to move the load horizontally. Will be.

These tower cranes are operated in the driver's seat at a considerably high position from the ground, so that the overload protection device and the protection device operate at 105% or less of the rated load according to the 'Technical Guidelines on the Protection Measures of the Tough Crane'. · A motion limiting device such as a lower limiting device, a turning limiting device, a driving limiting device, an air limiting device, a rope relaxation prevention device, a jib telescoping limiting device, and a performance limiting device for limiting the speed of rising, lowering, and rolling are attached. .

However, while the tower crane is installed, it is deformed at any time by the bending stress caused by the rotational motion of the jib according to the weight of the structure itself and the movement of the workpiece while responding to the wind pressure by the wind for a considerable period of time. The operator who rides in the driver's seat, which is formed in a structured structure, does not easily feel the shaking due to the displacement, and thus does not feel the danger of the behavior of the tower crane.

For this reason, if the damage caused by the deformation of the tower crane is neglected due to the idea that the tower crane is a fixed structure and the structural design considering the safety factor of the steel tower, the damage caused by the deformation of the tower crane is overlooked. In addition to damage to property, economic losses will result, as well as disruption to the company's image and planned work plans related to safety management.

Therefore, since the tower crane is one of the important matters after the installation because it is directly related to the safety of the general public and workers, it is necessary to observe the behavior of deformation in consideration of safety accidents and loss costs, Safety measures must be followed.

Risk detection of truss structures such as tower cranes is performed by comparing the measured data with the initial design and analysis data of the structure by automatically and continuously monitoring objective data using measurement tools such as wind vanes, anemometers, and tilt sensors. By identifying the structure, it is possible to initially predict the deformation of the structure and the damage and lifespan of the structure, and to obtain information on regional design supplements and design criteria considering the wind speed.

In the tower crane, the strain, deflection, acceleration, slope, and wind direction and wind speed can be measured mainly to obtain the stress caused by wind pressure.The acceleration measurement is used to measure the dynamic behavior of the tower such as natural frequency, attenuation mode, and mode shape. The measurement of the wind direction and wind speed is to measure the influence of the wind pressure on the deformation of the steel tower.

As a device for measuring and alerting to a dangerous situation of a tower crane, Republic of Korea Patent Publication No. 10-2005-26945 "Wireless wind speed alarm device" is known.

The wireless wind speed alarm device detects the wind strength as an electrical signal with a wind speed measurement sensor to calculate the wind speed value, and transmits the calculated wind speed value wirelessly by using a control signal outputted by comparing with the set wind speed value of the tower crane. Color-coded lamps and alarms alert the danger to the tower crane operator and site managers.

In such a conventional alarm device, the alarm and the alarm sound are output within a safe allowable range of the movement displacement of the tower crane, and in fact, the alarm and the alarm sound operate for the weak behavior for quick and safe alarm and notify the alarm from time to time. Given. This inertia against general alarms makes it impossible for most drivers or field managers to predict a dangerous situation, especially if the ground driving assistant cannot communicate with the driver without predicting how much displacement the structure has. In doing so, it is possible to induce large accidents by deciding driving progress based on observation and experience.

The present invention calculates the wind direction and wind speed value by detecting the wind intensity as an electrical signal using a weather measurement instrument such as an anemometer and wind speed sensor such as an anemometer and a wind vane, and is generated by wind pressure and self-weight detected using a tilt sensor. The displacement of the behavior is detected as an electrical signal, the calculated wind direction value and the displacement of the behavior are wirelessly transmitted and compared with a set reference value, and the displacement of the tower crane corresponding to the output signal is output to the tower crane driver's seat. It is intended to provide a danger detection alarm method for the tower crane that can be visually displayed on the monitor of the driver's seat and the ground operating assistant seat and the field management room so that the danger situation can be immediately recognized.

In order to achieve the above object, a risk detection alarm method of a tower crane wirelessly transmits a detected wind speed value using a weather measurement instrument, and compares the transmitted wind speed value with a set wind speed value to alert a dangerous situation of the tower crane. In that,

Inputting basic data on the truss structure of the tower crane (S100);

Fixing a plurality of tilt sensors at appropriate intervals on the mast and the kat head to acquire data corresponding to the basic data input in the step, and installing a wind vane and an anemometer on the cat head (S200);

Detecting, by an inclination sensor installed in the step, displacements caused by wind pressure acting on the truss structure and the own weight of the main jib, and weather information by the wind vane and anemometer as electrical signals (S300);

Amplifying and filtering the electrical signal detected in the step, and converting the digital signal from the A / D converter into digital data so as to perform arithmetic processing in the central processing unit (S400);

Comparing the wind velocity value and the displacement for the behavior obtained in the above step with the set reference value, and performing structural analysis and analysis of the detection data to determine the structural safety of whether the detected signal is out of a predetermined setting range (S500). );

Storing the result data on the structural safety and the behavior of the tower crane in the server in the driver's seat and outputting the result data on the display device as an image (S600);

Transmitting the image data output in the above step to the ground driving assistant and the on-site management room through the wireless network (S700);

And, when the image data is out of the set allowable safety range, an alarm step (S80) for operating the alarm and the lamp to inform the dangerous situation until the alarm release signal is input; characterized in that it comprises a technical feature.

The method of outputting the result data on the structural safety and the behavior of the tower crane as an image to the display device provided in the driver's seat shows the appearance of the tower crane and is estimated by the inclination of the mast with respect to the basic data. The vertical permissible safety range indicating the independence safety state and the maximum vertical destruction permissible range in which the breakage of the mast occurs are shown in a vertical line, and the independence safety state of the main jib is estimated by the weight of the main jib and the inclination by the object suspended on the hook. The horizontal permissible safety range and the maximum horizontal destruction permissible range in which the breakage of the mast occurs are displayed on the horizontal line to perform an audiovisual alarm according to the approach range of the envelope formed by the inclination of the mask and the main jib.

The above-described tower crane risk detection alarm method of the present invention, as well as the tower crane operator working in the height, as well as the ground operation assistant and site managers who work on the ground in cooperation with the driver as the alarm situation and alarm sound While audibly alerting, it is possible to visually check the allowable safety range and the maximum destruction allowance range in real time on the display device, so that the user can immediately determine the dangerous situation and take prompt action.

The device for detecting and alerting the danger of such a tower crane includes an input unit 11 for inputting site basic data of the tower crane C, design data of the truss structure, and various variables and commands;

In order to obtain the inclination angle and the inclination direction according to the behavior of the tower crane (C) calculated in correspondence with the basic data input to the input unit 11 is installed at a suitable interval between the mast (2) and the ket head (5) Tilt sensors 21, 22, 23, and 24;

A wind direction and anemometer (25) installed in the ket head (5) to obtain the wind direction and the wind speed calculated in correspondence with the basic data input to the input unit (11);

A control unit 12 having the input unit 11 and controlling the inclination sensors 21, 22, 23, 24 and the wind direction and anemometer 25, and controlling storage and display of related data; A memory 13 for storing field data and data obtained from an inclination sensor and a wind direction anemometer according to the control of (12); and related data according to the control of the control unit 12; and an operation state and a behavior state of the tower crane. A main server 10 having an image signal processing unit 14 outputted to the unit 14 and installed in the cab 4 of the tower crane C;

A first management server 30 for displaying a signal output from the control unit 12 of the main server 10 on a monitor of a ground driving assistant seat;

A second management server 40 for displaying a signal output from the control unit 12 of the main server 10 on a monitor of an on-site management room;

In addition, the control unit 12 of the main server 10 as a result of the analysis of the detection data and the structural safety as a result of detecting the detected signal is out of a predetermined setting range includes a technical feature that includes a warning unit do.

The features and advantages of the invention will be apparent from the embodiments described by the accompanying drawings.

Next, an embodiment of the present invention will be described.

The present invention can be applied to a tower crane having a structure of various forms, the following embodiment is described by taking an example of the situation applied to the jib-type tower crane.

2 shows an example of a jib type tower crane.

As referred to in this figure, the jib-type tower crane is a mast (2) formed of a truss structure on the foundation anchor (1), and the mast (2) as a hydraulic driving device using a hydraulic cylinder and a hydraulic motor on the upper part of the mast (2). Telescoping cage (3) for raising and lowering), the cab (4) provided in the upper part of the telescoping cage (3), the cat head (5) provided in the cab (4), and the head 5) a truss structure extending horizontally from the main body; a trolley 6 and a hook 7 are installed, and a main jib 8 for pulling the work object M; and a hoist from the opposite side of the main jib 8; It is comprised by the counter jib 9 equipped with the apparatus and maintaining the balance of the main jib 8.

Figure 3 shows a block diagram of a risk detection alarm apparatus of the present invention.

As referred to in this figure is the risk detection alarm device of the present invention is located in the cab (4) of the tower crane (C) is installed in the main server 10, the tower crane (C) for performing data input and output and operation Measuring unit 20 for measuring weather information and data on the behavior of the tower crane C and transmitting the data to the main server 10 and the ground operation assistance room to process the data acquired by the measuring unit 20 The first management server 30 for transmitting the data transmitted from the main server 10 to the ground driving assistant, and from the main server 10 to the second management server 40 for transmitting the situation to the field management room It is composed.

The main server 10 includes an input unit 11, a control unit 12, a memory 13, a display screen 14, and an image signal processor 15, and the measurement unit 20 includes a plurality of tilt sensors 21 and 22. , 23, 24 and the wind direction anemometer 25.

1 and 2, the mast 2 includes tilt sensors 21, 22, 23, and 24 at appropriate intervals in order to obtain data on the inclination angle and the inclination direction due to the weight of the structure, the working load, and the wind pressure. It is provided, and the wind head anemometer 25 for detecting the wind pressure and outputting it as an electrical signal is provided in the ket head 5 of the upper part of the mast 2. As shown in FIG.

The controller 12 is an A / D converter for converting analog signals output from the tilt sensors 21, 22, 23, 24 and the wind direction anemometer 25 into digital signals for calculation in the central processing unit, and the A / D converter. A D / A converter converts a signal output from the converter into an analog signal for outputting an image.

The controller 12 may be integrally formed on a board on which the tilt sensors 21, 22, 23, and 24 are installed in the measurement unit 20.

The main server 10 includes a wireless transmitter for transmitting signals output from the controller 12 and the image signal processor 15 to the first management server 30 and the second management server 40.

5 to 6 show an example in which the state of the tower crane is monitored and displayed on the screen according to the present invention.

5 is a screen showing the inclination angle of the tower crane in real time, the dotted line indicates the allowable safety range (S1, S2, S3), and the solid line indicates the maximum destruction allowable range (D1, D2, D3). Represent each.

The wind speed and wind direction at the top of the screen indicate the current state, in particular, the wind direction is shown as the current tower crane (C) rotated and the direction of the wind.

The risk is calculated by calculating the direction of wind and the current load to determine whether it passes the maximum vertical breaking allowance (D, D2, D3) compared to the maximum dynamic load according to the rolling.

The estimated load is calculated by showing the bending when lifting the initial workpiece (M). At this time, there may be some differences depending on the wind and location, but it can be estimated by calculating the height and bending of the tower.

The maximum dynamic load is estimated by calculating the difference in bending caused by the movement of the tower crane.

Therefore, the ground driving assistant may determine the transport of the trolley 6 in consideration of the transmitted bending angle and the estimated weight.

5 shows the accumulated number of times the section rotated by the main jib (9), it is easy to perform the settlement of the depreciation cost when renting the tower crane (C) through this analysis.

Figure 6 is a graph showing the operating state for each section over time, the time when the section having a slope from the bending start point (A) to the completion of the bending and the tilt direction angle movement start point (B) is loaded, the tilt direction angle The time period in which the horizontal section from the movement start point B to the inclination direction stop point C has traveled, and the section having the inclination from the inclination direction stop point C to the inclination angle return point D is unloaded. The horizontal section from the inclination angle return point D to the bending start point A 'of the next round represents the time of stopping without movement.

Through this analysis, the actual loading time and loading intervals can be analyzed to produce a report that can consider the repair and safety of the parts at a certain angle.

According to the present invention, by comparing the data measured in the course of automatic continuous objective monitoring with the initial design and analysis data of the truss structure of the tower crane to determine the current state of the structure, the deformation of the structure and the damage caused by the deformation And life expectancy can be predicted early, information on design supplements and design standards by region considering wind speed can be obtained, and safety due to inertia caused by conventional constant alarm sounding can be displayed visually on monitor by finding the slope according to wind direction. Relieve consciousness.

Claims (3)

In wirelessly transmitting the detected wind speed value by using a weather measuring instrument, and comparing the transmitted wind speed value with the set wind speed value to alert the dangerous situation of the tower crane, Inputting basic data on the truss structure of the tower crane (S100); Fixing a plurality of tilt sensors at appropriate intervals on the mast and the cat head to acquire data corresponding to the basic data input in the step, and installing a wind vane and an anemometer on the cat head (S200); Detecting, by an inclination sensor installed in the step, displacements caused by wind pressure acting on the truss structure and the own weight of the main jib, and weather information by the wind vane and anemometer as electrical signals (S300); Amplifying and filtering the electrical signal detected in the step, and converting the digital signal from the A / D converter into digital data so as to perform arithmetic processing in the central processing unit (S400); Comparing the wind velocity value and the displacement for the behavior obtained in the above step with the set reference value, and performing structural analysis and analysis of the detection data to determine the structural safety of whether the detected signal is out of a predetermined setting range (S500). ); Storing the result data on the structural safety and the behavior of the tower crane in the server in the driver's seat and outputting the result data on the display device as an image (S600); Transmitting the image data output in the above step to the ground operator and the on-site management room through the wireless network (S700); And, if the image data is out of the set allowable safety range alarm detection step (S800) for operating the alarm and the lamp to inform the dangerous situation until the alarm release signal is input; dangerous detection of the tower crane comprising a Alarm method. According to claim 1, The method of outputting the result data on the structural safety and the behavior of the tower crane to the display device provided in the driver's seat as an image showing the appearance of the tower crane, and estimated by the slope of the mast with respect to the basic data The vertical permissible safety range indicating the independence safety state on both sides of the mast and the maximum vertical destruction allowance for the destruction of the mast are shown in a vertical line, and the main jib is estimated by the weight of the main jib and the inclination of the object suspended on the hook. The horizontal permissible safety range indicating the jib's independence safety status and the maximum horizontal destruction permissible range at which the mast is destroyed are displayed on the horizontal line to perform audiovisual alarms according to the approach range of the envelope formed by the inclination of the mask and main jib. Above the tower crane characterized by Hum detection alarm method. In forming a device for wirelessly transmitting the detected wind speed value by using a meteorological measuring instrument and comparing the transmitted wind speed value with a set wind speed value to alert a dangerous situation of the tower crane, An input unit 11 for inputting site basic data of the tower crane C, design data of the truss structure, and various variables and commands; In order to obtain the inclination angle and the inclination direction according to the behavior of the tower crane (C) calculated in correspondence with the basic data input to the input unit 11, a plurality of installed at appropriate intervals on the mast (2) and the ket head (5) Tilt sensors 21, 22, 23, and 24; A wind direction and anemometer (25) installed in the ket head (5) to obtain the wind direction and the wind speed calculated in correspondence with the basic data input to the input unit (11); A control unit 12 having the input unit 11 and controlling the inclination sensors 21, 22, 23, 24 and the wind direction and anemometer 25, and controlling storage and display of related data; A memory 13 for storing field data and data obtained from an inclination sensor and a wind direction anemometer according to the control of (12); and related data according to the control of the control unit 12; and an operation state and a behavior state of the tower crane. A main server 10 having an image signal processing unit 15 outputted to the unit 14 and installed in the cab 4 of the tower crane C; A first management server 30 for displaying a signal output from the control unit 12 of the main server 10 on a monitor of a ground driving assistant seat; A second management server 40 for displaying a signal output from the control unit 12 of the main server 10 on a monitor of an on-site management room; And, as a result of the analysis of the detection data and the structural safety of the control unit 12 of the main server 10 as a result of the detected signal is out of a predetermined setting range includes a warning unit 16, characterized in that it comprises a tower Danger detection alarm of the crane.

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