KR20240022080A - A Method for Evaluating Safety of EARTH RETAINING WORK during Civil Engineering - Google Patents

Abstract

The present invention proposes a method for evaluating the safety of earth retaining construction during civil engineering work. The above safety evaluation method is one in which the image acquisition device acquires a first image including one or more of the sheathing wall, strut, wale, or adjacent structures that exist within a preset range from the sheathing wall. Step, after the image acquisition device acquires the first image, acquiring a second image taken at the same angle as the first image, the safety evaluation server receiving the first image and the second image from the image acquisition device. , and the safety evaluation server may include a step of evaluating the safety of the earth retaining construction based on a change in the position of one or more of the retaining walls, braces, strips, or adjacent structures commonly included in the first image and the second image.

Description

{A Method for Evaluating Safety of EARTH RETAINING WORK during Civil Engineering}

The present invention relates to civil engineering work. More specifically, it relates to a method for evaluating the safety of earth retaining construction during civil engineering work.

Sheathing work is work that involves installing retaining walls and other structures to prevent the surrounding ground from sinking or collapsing when excavating the ground. As such, specific methods of earth retaining construction exist in various ways depending on the size of the structure to be constructed, surrounding environmental conditions, characteristics of the earth supporting structure (temporary or permanent), construction period, or construction cost.

First of all, the earth retaining construction method can be classified into board pile method, thumb pile and horizontal board method, C.I.P method, S.C.W method, and underground continuous wall method, etc., depending on the material of the retaining wall.

Specifically, the sheet pile method is a method of forming a continuous earth retaining wall by engaging the joints of sheet piles and typing them into the ground with a vibro hammer or water jet. The thumb pile and horizontal plate (H-Pile + earth retaining plate) method is a construction method that involves inserting thumb piles into the ground or into pre-drilled holes, and then inserting earth retaining walls between the thumb piles while excavating the site. . The C.I.P (Cast In Place pile) method is a method of creating a cast-in-place pile by drilling a hole to a predetermined length using excavating equipment, filling the hole with assembled rebar and coarse aggregate, and then injecting mortar or pouring concrete. The S.C.W (Soil Cement Wall) method involves excavating the ground using a 3-axis earth auger, mixing it with the excavated soil while injecting cement milk, and inserting H-type steel to excavate soil cement ( soil cement) is a method of forming a pillar. In addition, the underground continuous wall (slurry wall) method is a method of creating a reinforced concrete wall underground by excavating the ground using a stabilizing fluid (bentonite slurry) and excavating equipment, inserting a reinforcing bar network, and then pouring concrete.

In addition, the earth retaining construction method can be classified into self-supporting method, brace method, anchor method, and soil nailing method, etc., depending on the support method of the retaining wall.

Specifically, the self-supporting (cantilever) method is a method of excavating by bearing earth pressure through the bending resistance of the earth retaining wall and the bending resistance of the ground at the entrance, without erecting support structures such as braces or wales. The strut method is a method of excavating by installing an earth retaining wall on the outskirts of the site to be excavated and then supporting it with supporting structures such as strips and braces. The anchor method is a method of excavating in stages, installing strips, then drilling, inserting anchor bodies, grouting, tensioning, and settling for earth anchor construction. In addition, the soil nailing method inserts a nail into the base layer to increase the overall shear strength of the base layer itself, then treats the entire surface with shotcrete to integrate the reinforced soil body, and then integrates the reinforced soil body. This is a construction method that separates the back from the original ground and creates the same shape as a conventional retaining wall.

Meanwhile, earth retaining construction is designed based on the results of limited ground investigation and soil testing performed at the time of excavation construction for underground structure construction. However, depending on the construction conditions, construction sequence, and process of the excavated temporary structure and reinforcement method, the actual behavior of the ground may differ significantly from the value estimated at the time of design. Therefore, measurement and management of earth retaining structures and soil displacement are required.

Observation of earth retaining work determines the target items to be measured based on the method of retaining work, surrounding environmental conditions, design and construction standards, etc., and determines the measuring instrument, measurement location, measurement cycle, etc. according to the determined target items. can be performed.

Measuring instruments for earth retaining construction include inclinometer, water level meter, building tiltmeter, strain gauge, load cell, ground settlement, and gap pressure gauge ( Piezometer, crack gauge, settlement extensometer, pressure cell, and seismometer may be included. Such measuring instruments for earth retaining construction are generally measured twice a week during construction and once a week after construction is completed.

However, the conventional measurement method as described above takes a lot of time to check the measured value after taking out the measuring instrument installed in the structure or ground of the earth retaining construction, and to judge its safety by comparing the measured value with the judgment standard value. . In addition, even if the structure or ground of the earth retaining work moves rapidly in the middle of the measurement cycle, it is difficult to immediately determine its safety.

Therefore, there is a need for a solution that can evaluate the safety of earth retaining work by measuring the structure and ground behavior of the retaining work in real time.

The present invention seeks to provide a method for measuring external changes in the structure and ground of an earth retaining construction in real time from the outside of the retaining structure and immediately evaluating the safety of the retaining construction based on the results measured outside the retaining structure.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below.

In order to achieve the technical problems described above, the present invention proposes a method for evaluating the safety of earth retaining construction. The safety evaluation method includes an image acquisition device acquiring a first image including one or more of a sheathing wall, a strut, a wale, or an adjacent structure that exists within a preset range from the sheathing wall. steps; After the image acquisition device acquires the first image, acquiring a second image taken at the same angle as the first image; A safety evaluation server receiving the first image and the second image from the image acquisition device; And the safety evaluation server may include a step of evaluating the safety of the earth retaining construction based on a change in the position of one or more of the retaining wall, brace, wale, or adjacent structure commonly included in the first image and the second image. there is. Here, the image acquisition device is installed on any one of the outer surfaces of the retaining wall, brace, strip, or adjacent structure, and can acquire images of the retaining wall, brace, strip, or adjacent structure in which it is not installed. .

In the safety evaluation method, the motion detection sensor emits light toward the reflector using a laser diode according to a preset cycle, but if the emitted light is not received or the time required from emission to light reception changes, the Transmitting a measurement request signal to a safety evaluation server; And when the measurement request signal is received from the motion detection sensor, the safety evaluation server may further include instructing the image acquisition device to transmit the first image and the second image based on this. In this case, the reflector may be installed on any one of the retaining walls, braces, strips, or the outer surface of the adjacent structure.

The step of transmitting the measurement request signal is performed when the emitted light is received again within a preset allowable time after the emitted light is not received, or when the required time is changed and returned to the original time within the allowable time. In this case, a measurement stop signal can be transmitted to the safety evaluation server.

In addition, the indicating step further receives a temperature value from the motion detection sensor, and determines whether the light emitted using the laser diode is blocked by the movement of the living organism based on the amount of change in the received temperature value. You can.

The motion detection sensor transmits the measurement request signal to the signal relay device through Bluetooth Low Energy, and the signal relay device transmits the measurement request signal to the safety evaluation server through Wi-Fi (Wireless Fidelity). Can be transmitted.

The step of evaluating safety includes extracting an edge existing in the first image; extracting one or more enclosures based on the extracted edges; And based on the shape of the extracted closed area, it may include identifying only objects corresponding to the retaining wall, brace, strip, or adjacent structure in the first image.

Additionally, the step of evaluating safety may include identifying an object corresponding to an object identified from the first image from the second image; If the location of the object identified from the first image does not match the location of the object identified from the second image, the distance from the location of the object identified from the first image to the location of the object identified from the second image Identifying the direction and amount of change; And based on the direction and amount of change, it may include determining the type of dangerous situation occurring in the earth retaining construction. For example, the step of determining the type of the dangerous situation determines the type of the dangerous situation as a ground subsidence or uplift type if the change amount is more than a preset threshold change value and the change direction is vertical to the ground surface, If the direction of change is parallel to the ground surface, the type of dangerous situation can be determined as a horizontal wall movement type. Additionally, in the step of determining the type of dangerous situation, if the change amount is greater than or equal to a preset threshold change value, a message including the determined type of dangerous situation may be transmitted to a pre-registered mobile communication terminal. Other embodiments Specific details are included in the detailed description and drawings.

According to the safety evaluation method according to embodiments of the present invention, the presence or absence of safety can be immediately determined regardless of the measurement cycle by measuring changes in the external appearance of the structure or ground of the earth retaining work outside the earth retaining work in real time. In addition, by placing the measuring instrument exposed to the outside rather than inside the earthen barrier, the maintenance burden of the measuring instrument can be greatly reduced.

In particular, in the conventional measurement method of earth retaining construction, the safety evaluation results may vary depending on the type of measuring device determined for measurement, the characteristics of the ground where the measuring device is installed, and the accuracy of the measured value and judgment standard value, etc., but according to the embodiments of the present invention, The safety evaluation method of other earth retaining construction enables accurate safety evaluation regardless of the type of measuring instrument decided for measurement, the characteristics of the ground where the measuring instrument is installed, and the accuracy of the measured values and judgment standards.

As such, the safety evaluation method of earth retaining construction according to the embodiments of the present invention can be applied overlapping with the conventional measuring method of earth retaining construction to further improve the safety of earth retaining construction.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

It should be noted that the technical terms used in this specification are only used to describe specific embodiments and are not intended to limit the present invention. In addition, the technical terms used in this specification, unless specifically defined in a different way in this specification, should be interpreted as meanings commonly understood by those skilled in the art in the technical field to which the present invention pertains, and are not overly comprehensive. It should not be interpreted in a literal or excessively reduced sense. Additionally, if the technical terms used in this specification are incorrect technical terms that do not accurately express the idea of the present invention, they should be replaced with technical terms that can be correctly understood by those skilled in the art. In addition, general terms used in the present invention should be interpreted according to the definition in the dictionary or according to the context, and should not be interpreted in an excessively reduced sense.

Additionally, as used herein, singular expressions include plural expressions, unless the context clearly dictates otherwise. In this application, terms such as “consist of” or “have” should not be construed as necessarily including all of the various components or steps described in the specification, and some of the components or steps may be It may not be included, or it should be interpreted as including additional components or steps. Additionally, terms including ordinal numbers, such as first, second, etc., used in this specification may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be named a second component without departing from the scope of the present invention, and similarly, the second component may also be named a first component.

When a component is referred to as being “connected” or “connected” to another component, it may be directly connected to or connected to the other component, but there may also be other components in between. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted. Additionally, in describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted. In addition, it should be noted that the attached drawings are only intended to facilitate easy understanding of the spirit of the present invention, and should not be construed as limiting the spirit of the present invention by the attached drawings. The spirit of the present invention should be construed as extending to all changes, equivalents, or substitutes other than the attached drawings.

The conventional measurement method for earth retaining construction required a lot of time to dig up the installed measuring instrument from the structure or ground of the earth retaining work, check the value of the measuring instrument, and judge its safety by comparing the confirmed value with the judgment standard value. . In addition, in cases where the structure or ground of the earth retaining work moved rapidly in the middle of the measurement cycle, it was difficult to immediately determine its safety.

The present invention was derived to solve the limitations of conventional measurement methods as described above.

Figure 1 is an exemplary diagram for explaining the characteristics of a safety evaluation method for earth retaining construction according to an embodiment of the present invention. According to the conventional measurement method of earth retaining construction, most measuring instruments were installed in a perforated hole in the ground located on the back of the earth retaining wall. And, according to the conventional safety evaluation method, during construction, twice a week, once a week after construction is completed, the already installed measuring instrument is taken out, the measured value is checked, and the measured value is compared with the judgment standard value. The safety of the earth retaining construction was assessed.

Alternatively, the measuring instruments 10, 13, and 20 of earth retaining construction according to an embodiment of the present invention may be installed outside the retaining earth. Here, the outside of the retaining wall means the outside of the ground located on the back of the retaining wall (1), not the inside of the ground located on the back of the retaining wall (1). In addition, the safety evaluation method of earth retaining construction according to an embodiment of the present invention is that the measuring instruments (10, 13, and 20) of earth retaining construction installed outside the retaining construction measure the external appearance of the structures (1, 3, and 5) of earth retaining construction and the ground. Changes can be measured and the safety of earth retaining construction can be evaluated based on the measured results.

According to the safety evaluation method of earth retaining construction according to an embodiment of the present invention, physical changes in the structures 1, 3, and 5 of earth retaining construction or the ground are measured in real time from the outside of the retaining work, so that it is independent of the measurement cycle. Safety can be determined immediately. In addition, since the measuring instruments 10, 13, and 20 of the earth retaining construction are exposed to the outside of the earth retaining work, the maintenance burden of the measuring instruments 10, 13, and 20 can be greatly reduced.

In particular, according to the conventional measurement method for earth retaining construction, the safety evaluation results may vary depending on the type of measuring instrument determined for measurement, the characteristics of the ground where the measuring instrument is installed, and the accuracy of the measured value and judgment standard value. However, according to the safety evaluation method of earth retaining construction according to an embodiment of the present invention, accurate safety evaluation is performed regardless of the type of measuring instrument determined for measurement, the characteristics of the ground on which the measuring instrument is installed, the accuracy of the measured value and the judgment standard value, etc. It becomes possible.

As such, the safety evaluation method of earth retaining construction according to an embodiment of the present invention can be applied overlapping with the measurement method of conventional earth retaining construction, thereby further improving the safety of earth retaining construction.

Hereinafter, the components for performing the safety evaluation method of earth retaining construction according to an embodiment of the present invention as described above will be described. As shown in FIG. 2, the safety evaluation method of earth retaining construction according to an embodiment of the present invention is described. The safety evaluation system may be configured to include one or more motion detection sensors (10), one or more image acquisition devices (20), a safety evaluation server (100), and a central control server (200).

The safety evaluation system for earth retaining construction according to another embodiment of the present invention may be configured to further include a signal relay device 30.

The safety evaluation system for earth retaining construction according to another embodiment of the present invention may be configured to further include a mobile communication terminal (40).

Since the components of the safety evaluation system for earth retaining construction merely represent functionally distinct elements, any one or more components can be integrated and implemented in the actual physical environment.

To describe each component of the safety evaluation system in more detail, the motion detection sensor 10 is a sensor that detects whether physical changes exist in the retaining structures 1, 3, and 5 and the ground. The motion detection sensor 10 of the present invention can be installed outside the earthen barrier. As such, the motion detection sensor 10 of the present invention may be configured to include a laser diode and an infrared ray sensor.

Specifically, the motion detection sensor 10 may use a laser diode to emit light toward the reflector 1 3 according to a preset light emission cycle. Here, the light emission period may be in seconds or minutes, but is not limited thereto. Light emitted from the motion detection sensor 10 may be reflected by the reflector 13. And, the motion detection sensor 10 may receive light reflected by the reflector 10.

The motion detection sensor 10 may transmit a measurement request signal to the safety evaluation server 100 when the emitted light is not received or when the time required from emitting light to receiving light changes. Here, the measurement request signal is a signal to notify that movement is detected and more precise measurement is required.

The motion detection sensor 10 may transmit a measurement stop signal to the safety evaluation server 100 when the emitted light is received again within a preset allowable time after the emitted light is not received. The motion detection sensor 10 may transmit a measurement stop signal to the safety evaluation server 100 when the time required from emitting light to receiving light changes and returns to the original time within a preset allowable time.

Here, the measurement stop signal is a signal to indicate that the detected movement is not the movement of the earth retaining construction structures (1, 3, and 5) or the ground. In general, when the structures (1, 3, and 5) or the ground of an earth retaining construction move due to earth pressure or hydraulic pressure, the once moved structures (1, 3, and 5) or the ground naturally move. This is because it cannot return to its original position.

Meanwhile, the motion detection sensor 10 can measure temperature based on the received wavelength value using an infrared sensor. And, the motion detection sensor 10 can transmit the measured temperature value to the safety evaluation server 100. In this way, the temperature value measured through the infrared sensor can be used to determine whether the change detected by the motion detection sensor 10 is caused by the movement of a living organism.

As described above, the motion detection sensor 10 and the reflector 13 may be installed to face each other on any one of the retaining wall (1), brace (3), wale (5), or the outer surface of an adjacent structure.

Here, the adjacent structure is a structure that exists within the damageable range from the earth retaining wall (1) and is a structure that is related or unrelated to the earth retaining construction. In addition, the possible damage range is the range that can be damaged if an accident occurs in the earth retaining wall 1, and can be set in advance depending on the size of the structure to be constructed, the earth retaining construction method, and the characteristics of the earth supporting structure.

The motion detection sensor 10 installed on the outer surface of the retaining wall (1), brace (3), strip (5), or adjacent structure can operate by receiving power from a battery. The motion detection sensor 10 can transmit and receive signals using Bluetooth Low Energy (BLE) to reduce battery consumption.

The motion detection sensor 10 may transmit a signal directly to the safety evaluation server 100 through Bluetooth Low Energy (BLE). However, when the distance between the motion detection sensor 10 and the safety evaluation server 100 is greater than the transmission distance of Bluetooth Low Energy (BLE), the motion detection sensor 10 transmits the signal relay device 30 to ensure safety. A signal may be transmitted to the evaluation server 100.

For example, the motion detection sensor 10 may transmit a measurement request signal, a measurement stop signal, or a temperature value to the signal relay device 30 through Bluetooth Low Energy (BLE). In addition, the signal relay device 30 may transmit the measurement request signal, measurement stop signal, or temperature value received from the motion detection sensor 10 to the safety evaluation server 100 through Wi-Fi (Wireless Fidelity, Wi-Fi). .

In the following configuration, the image acquisition device 20 is a device that acquires images of the retaining structures 1, 3, and 5 and the ground. The image acquisition device 20 of the present invention, like the motion detection sensor 10, can be installed outside the earthen barrier. As such, the image acquisition device 20 may be configured to include a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS).

Specifically, the image acquisition device 20 may receive an image transmission instruction from the safety evaluation server 100. Here, the video transmission instruction is a signal instructing to acquire and transmit a digital video.

The image acquisition device 20 may acquire the first image using CCD or CMOS. After acquiring the first image, the image acquisition device 20 may acquire a second image captured at the same angle as the first image using a CCD or CMOS. Here, the first image and the second image include the earth retaining wall 1 and the brace ( 3), one or more of the strips (5) or adjacent structures may be included.

And, the image acquisition device 20 may transmit the acquired first and second images to the safety evaluation server 100. As described above, the image acquisition device 20 may acquire images while installed on any of the earth retaining walls (1), braces (3), wales (5), or the outer surfaces of adjacent structures. In this way, the image acquisition device 20 installed on any one of the retaining wall (1), brace (3), strip (5), or the outer surface of an adjacent structure is connected to the retaining wall (1), brace (3) on which it is not installed. , images of the band (5) or adjacent structures can be acquired.

The image acquisition device 20 can transmit and receive signals using short-range wireless communication or mobile communication. Here, short-range wireless communication may be any one of Bluetooth, Zigbee, Near Field Communication (NFC), Wi-Fi, Wimax, and Wibro, but is not limited thereto. Mobile communications include Code Division Multiple Access (CDMA), Wideband CDMA (WCDMA), High Speed Packet Access (HSPA), and Long Term Evolution. LTE), but is not limited to this.

In the following configuration, the signal relay device 30 is a device that relays (pass through) signals transmitted and received between the first device and the second device. Such a signal relay device 30 can be used when it is difficult for the first device and the second device to transmit and receive signals directly.

Specifically, the signal relay device 30 may receive a signal from the motion detection sensor 10 or the image acquisition device 20. In addition, the signal relay device 30 may transmit the signal received from the motion detection sensor 10 or the image acquisition device 20 to the safety evaluation server 100.

Conversely, the signal relay device 30 may receive a signal from the safety evaluation server 100. And, the signal relay device 30 may transmit the signal received from the safety evaluation server 100 to the motion detection sensor 10 or the image acquisition device 20.

In particular, the signal relay device 30 according to an embodiment of the present invention can support a plurality of communication technologies simultaneously. That is, the signal relay device 30 can transmit and receive signals using a first communication technology in a relationship with a first device, and can transmit and receive signals using a second communication technology in a relationship with a second device.

For example, the signal relay device 30 may receive a measurement request signal, a measurement stop signal, or a temperature value from the motion monitoring sensor 10 through Bluetooth Low Energy (BLE). In addition, the signal relay device 30 transmits the measurement request signal, measurement stop signal, or temperature value received from the motion detection sensor 10 to the safety evaluation server 100 via Wi-Fi. can be transmitted to.

With the following configuration, the mobile communication terminal 40 is a terminal that can immediately check real-time information on the safety of earth retaining construction. The mobile communication terminal 40 of the present invention may be a mobile communication terminal carried by the manager or person in charge of earth retaining construction, but is not limited thereto. Specifically, the mobile communication terminal 40 is a safety evaluation server 100. ) or an action request message may be received from the central control server 200. Here, the action request message is a message to inform that immediate action is needed for earth retaining construction. The action request message may include, but is not limited to, whether a hazardous situation has occurred in the earth retaining construction and the type of hazardous situation that has occurred in the earth retaining construction.

In the following configuration, the safety evaluation server 100 is a server that evaluates the safety of earth retaining construction. The safety evaluation server 100 of the present invention can evaluate the safety of earth retaining construction based on information collected from the motion detection sensor 10 and the image acquisition device 20 installed outside the retaining earth. The configuration and operation of the safety evaluation server 100 will be described in more detail later with reference to FIGS. 3, 4, 8, and 9.

In the following configuration, the central control server 200 is a server for integrated management of the safety of earth retaining work performed in multiple locations. The central control server 200 of the present invention is not limited to that term and may be any one of fixed computing devices such as a desktop, workstation, or server.

Specifically, the central control server 200 may receive the safety evaluation results of earth retaining construction from the safety evaluation server 100. The central control server 200 may store the received safety evaluation results in a database. If the central control server 20 0 determines that immediate action is needed for earth retaining construction, it may transmit an action request message to the mobile communication terminal 40.

As described above, the signal relay device 30, the safety evaluation server 100, and the central control server 200 can transmit and receive data through a public network. The public network can be either a mobile communication network or a public wired communication network. The mobile communication network may be, but is not limited to, a network using Code Division Multiple Access (CDMA), Wide Band Code Division Multiple Access (WCDMA), High Speed Packet Access (HSPA), or Long Term Evolution (LTE). The public wired communication network may be a network using Ethernet, xDigital Subscriber Line (xDSL), Hybrid Fiber Coax (HFC), or Fiber To The Home (FTTH). It may be possible, but it is not limited to this.

Hereinafter, the configuration of the safety evaluation server 100 as described above will be described in more detail. Figure 3 is a logical configuration diagram of a safety evaluation server according to an embodiment of the present invention.

As shown in FIG. 3, the safety evaluation server 100 includes a communication unit 105, an input/output unit 110, a measurement performance determination unit 115, an image collection unit 120, a safety evaluation unit 125, and a result dissemination unit. It may be configured to include a unit 130.

Since the components of the safety evaluation server 100 merely represent functionally distinct elements, any one or more components may be integrated and implemented in an actual physical environment.

To describe each component of the safety evaluation server 100 in more detail, the communication unit 105 can transmit and receive data with the motion detection sensor 10, the image acquisition device 20, or the central control server 200. .

Specifically, the communication unit 105 may receive a measurement request signal, a measurement stop signal, and a measured temperature value from the motion detection sensor 10. The communication unit 105 may transmit an image request signal to the image acquisition device 20. The communication unit 105 may receive an image from the image acquisition device 20. The communication unit 105 may transmit the safety evaluation results to the central control server 200. And, the communication unit 105 can transmit an action request message to the mobile communication terminal 40.

With the following configuration, the input/output unit 110 can receive commands or data required for operation of the safety evaluation server 100 or output calculation results of the safety evaluation server 100.

Specifically, the input/output unit 110 may receive a setting value for the light emission cycle of the motion detection sensor 10 from the user. The input/output unit 110 may receive a setting value for the allowable time from the user. The input/output unit 110 can receive input of the allowable temperature change amount from the user. The input/output unit 110 may receive a setting value for the possible damage range from the user to determine the range of the adjacent structure. The input/output unit 110 can receive a critical change value for evaluating the safety of earth retaining construction from the user. Additionally, the input/output unit 110 can receive the contact information of the mobile communication terminal 40 that will receive the action request message.

In the following configuration, the measurement performance determination unit 115 can determine whether to perform measurement on earth retaining construction based on the information collected from the motion detection sensor 10.

Specifically, the measurement performance determination unit 115 can set the setting value by transmitting it to the motion detection sensor 10 at the light emission cycle or allowable time input through the input/output unit 110. When a measurement request signal is received from the motion detection sensor 10 through the communication unit 105, the measurement performance determination unit 115 may wait for the allowable time or request a temperature value from the motion detection sensor 10. .

If a measurement stop signal is received from the motion detection sensor 10 within the allowable time, the measurement performance determination unit 115 may determine that there is no need to perform measurement. Alternatively, if a measurement stop signal is not received from the motion detection sensor 10 within the allowable time, the measurement performance determination unit 115 may determine a situation in which measurement must be performed.

Meanwhile, even if a measurement stop signal is not received from the motion detection sensor 10 within the allowable time, the measurement performance determination unit 115 determines that the difference between the temperature value received from the motion detection sensor 10 and the existing temperature value is the allowable temperature. If it is greater than the change amount, it can be determined that there is no need to perform measurement. Alternatively, the measurement performance determination unit 115 may determine a situation in which measurement must be performed when the difference between the temperature value received from the motion detection sensor 10 and the existing temperature value is smaller than the allowable temperature change amount.

That is, the measurement performance determination unit 115 determines whether the light emitted by the motion detection sensor 10 using a laser diode is blocked by the movement of the living organism based on the amount of change in the temperature value received from the motion detection sensor 10. You can judge whether it has been done or not. In addition, when the measurement performance determination unit 115 determines that the emitted light is blocked by the movement of a living organism, it may determine that there is no need to perform measurement.

In the following configuration, the image collection unit 120 can collect images from the image acquisition device 20 when the measurement performance determination unit 115 determines that a situation needs to be performed.

Specifically, when the image collection unit 120 determines that the measurement performance determination unit 115 is in a situation where measurement must be performed, the image collection unit 120 may transmit an image request signal to the image acquisition device 20 through the communication unit 105. .

Here, the image request signal is a signal instructing to transmit a plurality of images captured by the image acquisition device 20. The plurality of images may include a first image including one or more of an earth retaining wall, brace, strip, or adjacent structure, and a second image taken from the same angle as the first image after shooting the first image.

In addition, the image collection unit 120 may receive the first image and the second image from the image acquisition device 20 through the communication unit 105.

With the following configuration, the safety evaluation unit 125 can evaluate the safety of earth retaining construction based on the images collected by the image collection unit 120.

Specifically, the safety evaluation unit 125 may extract an edge existing in the image for each of the first image and the second image. The safety evaluation unit 125 may use either a Laplacian of Gaussian (LoG) algorithm or a Difference of Gaussian (DoG) algorithm to extract edges (edge detection) from each image.

For example, when using the LoG algorithm, the safety evaluation unit 125 can remove noise present in the image using a Gaussian filter. The safety evaluation unit 125 may apply a Laplacian filter to the image from which noise has been removed. Additionally, the safety evaluation unit 125 may detect zerocrossing in the image to which the Laplacian filter is applied and extract the edge.

For another example, when using the DoG algorithm, the safety evaluation unit 125 generates two Gaussian masks with different variances from the image. The safety evaluation unit 125 subtracts the other mask from one generated mask. Additionally, the safety evaluation unit 125 may extract an edge by applying a mask from which another mask is missing to the image.

The safety evaluation unit 125 may extract one or more enclosures based on the extracted edges. In this case, the safety evaluation unit 125 may first process binarization on the image to clarify whether the edge area is closed.

The safety evaluation unit 125 is based on the shape of the extracted closed area for each of the first image and the second image. Only the corresponding object can be identified. More specifically, the safety evaluation server 100 stores various shape information about earth retaining walls, braces, strips, or structures related to earth retaining construction that may have depending on the shooting angle and type. A database can be prepared in advance.

Based on the information on the shape of the extracted closed area, the safety evaluation unit 125 queries a previously prepared database to determine whether an earth retaining wall, brace, wale, or structure related to earth retaining construction corresponds to the shape of the closed area. You can determine whether it exists in the database.

If there is an earth retaining wall, brace, strip, or structure related to earth retaining construction that corresponds to the shape of the closed area in the database, the safety evaluation unit 125 determines that the closed area corresponds to an earth retaining wall, brace, strip, or adjacent structure. It can be identified as an object. On the contrary, if there is no earth retaining wall, brace, strip, or earth retaining construction-related structure corresponding to the shape of the closed area in the database, the safety evaluation unit 125 identifies the closed area as an object not related to earth retaining construction. can do.

The safety evaluation unit 125 may identify an object corresponding to the object identified from the first image from the second image. In addition, the safety evaluation unit 125 may determine that the earth retaining construction is safe when the location of the object identified from the first image matches the location of the object identified from the second image.

Differently, if the location of the object identified from the first image does not match the location of the object identified from the second image, the safety evaluation unit 125 determines the location of the object identified from the first image. The direction and amount of change from the location to the location of the object identified from the second image can be identified.

Here, the direction of change may be one of a vertical direction to the ground surface, a horizontal direction to the ground surface, or a diagonal line direction to the ground surface. And, the amount of change may be the number of pixels existing between the object in the first image and the object in the second image according to the resolution of the image.

If the identified change amount is greater than or equal to the threshold change value input through the input/output unit 110, the safety evaluation unit 125 may determine that a hazardous situation has occurred in the earth retaining construction. In this case, the safety evaluation unit 125 may determine the type of risk situation occurring in the earth retaining construction based on the identified direction of change. On the contrary, the safety evaluation unit 125 may determine that the earth retaining construction is safe when the identified change amount is less than the critical change value.

For example, if the identified direction of change is the vertical direction of the ground surface, the safety evaluation unit 125 may determine the type of dangerous situation occurring in the earth retaining construction as a ground subsidence or uplift type. Alternatively, when the identified direction of change is parallel to the ground surface, the safety evaluation unit 125 may determine the type of dangerous situation occurring in the earth retaining construction as the type of horizontal movement of the wall.

With the following configuration, the result dissemination unit 130 can disseminate the safety evaluation results of the earth retaining construction determined by the safety evaluation unit 125.

Specifically, the result dissemination unit 130 may transmit the safety evaluation results to the central control server 200 through the communication unit 105. Here, the safety evaluation result is a result evaluated by the safety evaluation unit 125 that the earth retaining construction is safe or that a dangerous situation has occurred in the earth retaining construction.

In addition, when the change amount identified by the safety evaluation unit 125 is greater than or equal to the threshold change value, the result propagation unit 130 pre-registers an action request message containing the type of risk situation determined by the safety evaluation unit 125. It can be transmitted to the mobile communication terminal 40.

Hereinafter, the hardware for implementing the logical components of the safety evaluation server 100 as described above will be described in more detail.

Figure 4 is a hardware configuration diagram of a safety evaluation server according to an embodiment of the present invention.

As shown in FIG. 4, the safety evaluation server 100 includes a processor (150), a memory (155), a transceiver (160), an input/output device (165), and a data bus. (Bus, 170) and storage (Storage, 175).

The processor 150 may implement the operations and functions of the safety evaluation server 100 based on instructions according to the software 180a in which the safety evaluation method is implemented, which resides in the memory 155. Software 180a implementing a safety evaluation method may be loaded in the memory 155. The transceiver 160 can transmit and receive signals with the motion detection sensor 10, the image acquisition device 20, the signal relay device 30, the mobile communication terminal 40, and the central control server 200. The input/output device 165 can receive data required for the operation of the safety evaluation server 100 and output status information and safety evaluation results. The data bus 170 is connected to the processor 150, memory 155, transceiver 160, input/output device 165, and storage 175, and is a moving path for transferring data between each component. can perform the role of

The storage 175 may store an application programming interface (API), a library file, a resource file, etc. required for the execution of the software 180a in which the safety evaluation method is implemented. The storage 175 may store software 180b in which the safety evaluation method is implemented. In addition, the storage 175 may store a database 185 in which various shape information about earth retaining walls, braces, strips, or earth retaining construction-related structures may be stored depending on the shooting angle and type.

When a measurement request signal is received from the motion detection sensor 10, the software 180a, 180b for implementing the safety evaluation method residing in the memory 155 or stored in the storage 175 generates the first image and Instructing the image acquisition device 20 to transmit a second image; Receiving a first image and a second image from the image acquisition device 20; and a computer recorded on a recording medium to execute the step of evaluating the safety of the earth retaining construction based on a change in the position of one of the retaining walls, braces, strips, or adjacent structures commonly included in the first image and the second image. It could be a program.

More specifically, the processor 150 may include an application-specific integrated circuit (ASIC), another chipset, a logic circuit, and/or a data processing device. Memory 155 may include read-only memory (ROM), random access memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The transceiver 160 may include a baseband circuit for processing wired and wireless signals. The input/output device 165 includes input devices such as a keyboard, mouse, and/or joystick, a liquid crystal display (LCD), an organic light emitting diode (OLED), and/ Alternatively, it may include an image output device such as an active organic light emitting diode (Active Matrix OLED, AMOLED), a printing device such as a printer, a plotter, etc.

When the embodiments included in this specification are implemented as software, the above-described method may be implemented as a module (process, function, etc.) that performs the above-described function. The module resides in memory 155 and can be executed by processor 150. Memory 155 may be internal or external to processor 150 and may be coupled to processor 150 by a variety of well-known means.

Each component shown in FIG. 4 may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of implementation by hardware, an embodiment of the present invention includes one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), and FPGAs ( Field Programmable Gate Arrays), processor, controller, microcontroller, microprocessor, etc.

In addition, in the case of implementation by firmware or software, an embodiment of the present invention is implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above, and is stored on a recording medium readable through various computer means. can be recorded Here, the recording medium may include program instructions, data files, data structures, etc., singly or in combination. Program instructions recorded on the recording medium may be those specifically designed and configured for the present invention, or may be known and available to those skilled in the art of computer software. For example, recording media include magnetic media such as hard disks, floppy disks and magnetic tapes, optical media such as CD-ROM (Compact Disk Read Only Memory) and DVD (Digital Video Disk), and flops. It includes magneto-optical media such as floptical disks, and hardware devices specially configured to store and execute program instructions such as ROM, RAM, flash memory, etc. Examples of program instructions may include machine language code such as that created by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc. Such a hardware device may be configured to operate as one or more software to perform the operation of the present invention, and vice versa. Hereinafter, the operation of the safety evaluation server 100 as described above will be described in more detail. Do this.

Figures 5A to 5D are exemplary diagrams for explaining the process of identifying structures of earth retaining construction according to an embodiment of the present invention.

Referring to FIG. 5A, the image received by the safety evaluation server 100 from the image acquisition device 20 includes the earth retaining construction structures (1, 3, and 5), the construction site ground (7), and other personnel working at the construction site ( 9) etc. may be included. In addition, the earth retaining construction structures (1, 3, and 5), the construction site ground (7), and other personnel working at the construction site (9) included in the video can be expressed in various colors depending on their types and characteristics.

As shown in FIG. 5B, the safety evaluation server 100 can extract edges present in the image received from the image acquisition device 20. The specific edge extraction method of the safety evaluation server 100 is the same as described above, so it is not described redundantly. In this way, by extracting edges from an image, unnecessary colors, unclear boundaries, etc. present in the image can be removed.

As shown in FIG. 5C, the safety evaluation server 100 may extract one or more closed areas formed by the extracted edges. The specific closed area extraction method of the safety evaluation server 100 is the same as described above, so it is not described redundantly. In this way, by extracting only the closed area from the image, segments of lines that do not form a specific shape within the image can be removed.

As shown in FIG. 5D, the safety evaluation server 100 can identify only the retaining wall (1), braces (3), and strips (5) corresponding to the structure of retaining work, based on the shape of the extracted closed area. You can. The method of identifying the structure of the earth retaining work of the safety evaluation server 100 is the same as described above, so it is not described redundantly. In this way, information unrelated to the safety of the earth retaining construction must be removed from the video to more accurately evaluate the safety of the earth retaining construction.

Figures 6a to 6c are exemplary diagrams for explaining the safety of an earthen barrier evaluated according to an embodiment of the present invention.

As shown in FIGS. 6A to 6C, the ground located on the back of the retaining wall 1 may move in a horizontal, vertical, or diagonal direction due to a change in surrounding earth pressure or a change in ground water level. In this case, the retaining wall (1), brace (3), and strip (5) pushed by earth pressure change their positions.

The amount of change from the position of the retaining wall (1) identified in the first image to the position of the retaining wall (1) identified in the second image is greater than or equal to the threshold change value, or the brace (3) identified in the first image Brace identified within the second image at the location of

The amount of change from the position of (3) is greater than or equal to the threshold change value, or the amount of change from the position of the wale 5 identified in the first image to the position of the wale 5 identified in the second image is the threshold change. If it is greater than or equal to the value, the safety evaluation server 100 may determine that a dangerous situation has occurred in the earth retaining construction.

In this case, the safety evaluation server 100 determines the direction of change from the position of the retaining wall 1 identified in the first image to the position of the retaining wall 1 identified in the second image, and the position of the retaining wall 1 identified in the first image. The direction of change from the position of the brace 3 to the position of the brace 3 identified in the second image, and the band field identified in the second image from the position of the band 5 identified in the first image ( Based on the fact that the direction of change up to the position in 5) is all parallel to the ground surface, it can be determined that a hazardous situation of the horizontal movement type of the wall has occurred in the earth retaining construction.

Hereinafter, features for reducing power consumption of the motion detection sensor 10 will be described.

Figure 7 is an exemplary diagram illustrating a process in which a motion detection sensor transmits a signal to a safety evaluation server according to an embodiment of the present invention.

As shown in FIG. 7, the motion detection sensor 10 can transmit a signal using Bluetooth Low Energy (BLE). However, Bluetooth Low Energy (BLE) has low power consumption, but the maximum range of the signal is not long.

Therefore, the motion detection sensor 10 does not transmit a signal directly to the safety evaluation server 100, but instead a signal relay device

It can be sent to (30). In addition, the signal relay device 30 transmits the signal received from the motion detection sensor 10 to the safety evaluation server 100 using Wi-Fi, which has a longer signal range than Bluetooth Low Energy (BLE). You can.

The motion detection sensor 10 according to an embodiment of the present invention can be attached to any one of the retaining wall 1, braces 3, strips 5, or the outer surface of an adjacent structure, and thus receives power from a battery. It can work. Therefore, in order to reduce the power consumption of the motion detection sensor 10, the signal relay device 30 operating with constant power is used to connect the motion monitoring sensor 10 and the safety evaluation server 100. Signals can be relayed.

Hereinafter, the operation of the safety evaluation server 100 as described above will be described. Figure 8 is a flowchart for explaining the safety evaluation method according to an embodiment of the present invention.

As shown in FIG. 8, the safety evaluation server 100 may receive a measurement request signal from the motion detection sensor 10 (S100). In this case, the safety evaluation server 100 may wait for the allowable time or may request a temperature value from the motion detection sensor 10.

The safety evaluation server 100 determines whether a measurement stop signal is not received from the motion detection sensor 10 within the allowable time, or the temperature value additionally received from the motion detection sensor 10 is compared with the existing temperature value to determine the allowable temperature. If it is smaller than the change amount, an image request signal can be transmitted to the image acquisition device 20 (S200).

Here, the image request signal is a signal instructing to transmit a plurality of images captured by the image acquisition device 20. Additionally, the plurality of images may include a first image including one or more of an earth retaining wall, brace, strip, or adjacent structure, and a second image taken from the same angle as the first image after the first image is captured.

The safety evaluation server 100 may receive the first image and the second image from the image acquisition device 20 (S300).

The safety evaluation server 100 includes an earth retaining wall (1), a brace (3), and a strip commonly included in the received first and second images.

(5) Alternatively, the safety of earth retaining construction can be evaluated based on a change in the position of one or more of the adjacent structures (S400). A specific evaluation method of the safety evaluation server 100 will be described later with reference to FIG. 9.

And, the safety evaluation server 100 may transmit the safety evaluation results to the central control server 200 (S500). If necessary, the safety evaluation server 100 may transmit an action request message to the mobile communication terminal 40.

Figure 9 is a flow chart to explain in more detail the safety evaluation step (S400) according to an embodiment of the present invention. As shown in FIG. 9, the safety evaluation server receives the first image and the second image from the image acquisition device 20 (S300).

(100) can extract edges existing in the images for each of the first and second images (S410). In this case, the safety evaluation server 100 may use either the LoG algorithm or the DoG algorithm to extract edges from each image.

The safety evaluation server 100 may extract one or more closed areas for edges for each of the first image and the second image (S420). In this case, the safety evaluation server 100 may first process binarization on the image to clarify whether the edge area is closed.

The safety evaluation server 100 is based on the shape of the extracted closed area for each of the first image and the second image, to the retaining wall (1), brace (3), wale (5) or adjacent structure in the image. The corresponding object can be identified (S430). In this case, the safety evaluation server 100 may use a database that stores various shape information about retaining walls, braces, strips, or structures related to retaining construction that may be present depending on the shooting angle and type.

The safety evaluation server 100 may identify an object corresponding to the object identified from the first image from the second image (S440).

The safety evaluation server 100 may determine whether the amount of change from the position of the object identified from the first image to the position of the object identified from the second image is greater than or equal to the threshold change value (S450). As a result of the determination, if the amount of change from the position of the object identified in the first image to the position of the object identified in the second image is less than the threshold change value, the safety evaluation server 100 may determine that the earth retaining construction is safe.

As a result of the determination, if the amount of change from the position of the object identified in the first image to the position of the object identified in the second image is greater than or equal to the threshold change value, the safety evaluation server 100 determines that a hazardous situation has occurred in the earth retaining construction, and , Based on the direction of change from the position of the object identified in the first image to the position of the object identified in the second image, the type of dangerous situation occurring in the earth retaining construction can be determined (S460).

Hereinafter, the signal flow for performing the safety evaluation method of earth retaining construction as described above will be described.

Figure 10 is a signal flow diagram between components of a safety evaluation system according to an embodiment of the present invention.

As shown in FIG. 10, the motion detection sensor 10 can detect whether physical changes exist in the retaining structures 1, 3, and 5 and the ground using a laser diode and an infrared sensor (S1110). When a physical change is detected in the earth retaining structures (1, 3, and 5) or the ground, the motion detection sensor 10 may transmit a measurement request signal to the safety evaluation server 100 (S1120).

The safety evaluation server 100 may transmit an image request signal to the image acquisition device 20 (S1130).

The image acquisition device 20 may acquire the first image by performing the first imaging using CCD or CMOS (S1140). Then, the image acquisition device 20 may transmit the acquired first image to the safety evaluation server 100 (S1150).

The image acquisition device 20 may acquire the second image by performing a second capture at the same angle as the first image (S1160). And, the image acquisition device 20 may transmit the acquired second image to the safety evaluation server 100 (S1170). Meanwhile, according to another embodiment of the present invention, the image acquisition device 20 may transmit the first image and the second image simultaneously. The safety evaluation server 100 determines the location of one or more of the retaining wall (1), brace (3), wale (5), or adjacent structures commonly included in the first and second images received from the image acquisition device (20). Based on the changes, the safety of earth retaining construction can be evaluated (S1180). And, the safety evaluation server 100 may transmit the safety evaluation results to the central control server 200 (S1190).

The central control server 200 may store the safety evaluation results received from the safety evaluation server 100 in a database. In addition, if the central control server 200 determines that immediate action is necessary for earth retaining construction, it may disseminate an action request message to pre-registered mobile communication terminals 40, etc. (S1200).

As described above, preferred embodiments of the present invention have been disclosed in the specification and drawings, but other modifications based on the technical idea of the present invention can be implemented in addition to the embodiments disclosed herein. It is self-evident to those with ordinary knowledge. In addition, although specific terms are used in the specification and drawings, they are merely used in a general sense to easily explain the technical content of the present invention and aid understanding of the invention, and are not intended to limit the scope of the present invention. Accordingly, the above detailed description should not be construed as restrictive in all respects and should be considered illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the present invention are included in the scope of the present invention.

In addition, a device or terminal according to the present invention can be driven by instructions that cause one or more processors to perform the functions and processes described above. For example, such instructions may include interpreted instructions, such as script instructions, such as JavaScript or ECMAScript instructions, executable code, or other instructions stored on a computer-readable medium. Furthermore, the device according to the present invention may be implemented in a distributed manner across a network, such as a server farm, or may be implemented in a single computer device.

In addition, a computer program (also known as a program, software, software application, script or code) mounted on the device according to the present invention and executing the method according to the present invention includes a compiled or interpreted language or an a priori or procedural language. It can be written in any form of programming language, and can be deployed in any form, including a stand-alone program, module, component, subroutine, or other unit suitable for use in a computer environment. Computer programs do not necessarily correspond to files in a file system. A program may be defined within a single file provided for the requested program, or within multiple interacting files (e.g., files storing one or more modules, subprograms, or portions of code), or files containing other programs or data. (e.g., one or more scripts stored within a markup language document). The computer program may be deployed to run on a single computer or multiple computers located at one site or distributed across multiple sites and interconnected by a communications network. In addition, in describing embodiments according to the present invention, Although operations are depicted in the drawings in a specific order, this should not be construed as requiring that such operations be performed in the specific order or sequential order shown or that all illustrated operations must be performed to obtain desirable results. . In certain cases, multitasking and parallel processing can be advantageous. Additionally, the separation of various system components in the above-described embodiments should not be construed as requiring such separation in all embodiments, and the described program components and systems are generally integrated together into a single software product or integrated into multiple software products. It should be understood that it can be packaged.

Claims (10)

Acquiring, by an image acquisition device, a first image including one or more of a sheathing wall, a strut, a wale, or an adjacent structure existing within a preset range from the sheathing wall;
acquiring, by the image acquisition device, a second image taken at the same angle as the first image after acquiring the first image;
A safety evaluation server receiving the first image and the second image from the image acquisition device; and
Comprising the step of evaluating, by the safety evaluation server, the safety of earth retaining construction based on a change in the position of one or more of the earth retaining wall, brace, strip, or adjacent structure commonly included in the first image and the second image, A method for evaluating the safety of earth retaining construction during civil engineering work. According to claim 1,
The motion detection sensor emits light toward the reflector using a laser diode according to a preset cycle, but if the emitted light is not received or the time required from emission to light reception changes, the safety evaluation server measures it. transmitting a request signal; and
When the measurement request signal is received from the motion detection sensor, the safety evaluation server further includes instructing the image acquisition device to transmit the first image and the second image based on this,
A method for evaluating the safety of earth retaining construction during civil engineering construction, characterized in that the reflector is installed on any one of the retaining walls, braces, strips, or the outer surface of the adjacent structure. The method of claim 2, wherein transmitting the measurement request signal
If the emitted light is received again within a preset allowable time after the emitted light is not received, or if the required time is changed and then returned to the original time within the allowable time, measurement is performed on the safety evaluation server. A method for evaluating the safety of earth retaining construction during civil engineering work, characterized by transmitting a stop signal. The method of claim 2, wherein the instructing step is
A civil engineering device that further receives a temperature value from the motion detection sensor and, based on the amount of change in the received temperature value, determines whether the light emitted using the laser diode is blocked by the movement of a living organism. Method for evaluating the safety of earth retaining construction during construction. According to clause 2,
The motion detection sensor transmits the measurement request signal to a signal relay device through Bluetooth Low Energy,
A method for evaluating the safety of earth retaining construction during civil engineering construction, characterized in that the signal relay device transmits the measurement request signal to the safety evaluation server through Wi-Fi (Wireless Fidelity). The method of claim 1, wherein the step of evaluating safety is
extracting an edge existing in the first image;
extracting one or more enclosures based on the extracted edges; and
Characterized in that it includes the step of identifying only objects corresponding to the retaining wall, brace, wale or adjacent structure in the first image, based on the shape of the extracted closed area, during civil engineering construction. Method for evaluating the safety of earth retaining construction. The method of claim 6, wherein the step of evaluating safety is
identifying an object corresponding to an object identified from the first image from the second image;
If the location of the object identified from the first image does not match the location of the object identified from the second image, the distance from the location of the object identified from the first image to the location of the object identified from the second image Identifying the direction and amount of change; and
A method for evaluating the safety of earth retaining construction during civil engineering work, comprising the step of determining the type of hazardous situation occurring in the earth retaining work based on the direction and amount of change. The method of claim 7, wherein determining the type of dangerous situation comprises
When the amount of change is more than a preset critical change value, if the direction of change is perpendicular to the ground surface, the type of the dangerous situation is determined as a ground subsidence or uplift type, and if the direction of change is parallel to the ground surface, the type of the dangerous situation is determined. Safety assessment method, characterized in that it is determined by the type of horizontal movement of the wall. The method of claim 7, wherein determining the type of dangerous situation comprises
A method for evaluating the safety of earth retaining construction during civil engineering construction, characterized in that when the amount of change is greater than or equal to a preset threshold change value, a message containing the type of the determined dangerous situation is transmitted to a pre-registered mobile communication terminal. The method of claim 1, wherein the image acquisition device
It is installed on any one of the outer surfaces of the earth retaining wall, brace, strip, or adjacent structure, and is characterized in that it acquires images of the earth retaining wall, brace, strip, or adjacent structure that is not installed. A method for evaluating the safety of.