Displacement measurement device and damage assessment system

Abstract

To provide a displacement measurement device that can measure the amount of displacement of each story of a multi-story building after an earthquake without time deviation, and a damage degree evaluation system that can accurately evaluate the presence or absence of damage to the building and the degree of the damage by using the displacement measurement device.SOLUTION: A displacement measurement device 50 measures displacement of a multi-story building B after an earthquake, and the device has: a plurality of marks 30 that are provided at different heights on an outer wall W of the building B; a support member 20 that overhangs outdoors from the rooftop B1 or the roof of the building B; and an imaging device 10 that is attached to the support member 20 and simultaneously picks up images of the plurality of marks 30.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a displacement measuring device and a damage assessment system. [Background technology]

[0002] When assessing the degree of damage (or damage level) to a building during an earthquake, the measured displacement of the building (displacement of each floor) and the story deformation angle calculated based on this displacement are used. Patent Document 1 proposes an example of a technology that measures the displacement of a multi-story building during an earthquake and evaluates the soundness of the building based on the measured displacement.

[0003] The building integrity assessment system proposed in Patent Document 1 is a system in which cameras are fixed to the ceiling of each floor of a multi-story building, and the cameras on each floor capture images of an area including signs fixed to the floor of each floor, and the images captured by each camera are sent to a server via a network. The server performs image analysis on the captured images to determine the three-dimensional position and shape of signs of known shapes included in the images, identifies the amount of displacement of each floor during an earthquake based on the determined three-dimensional position and shape of the signs, and performs an earthquake integrity assessment using the story deformation angle calculated based on the amount of displacement. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-189578 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the building health assessment system described in Patent Document 1, the amount of displacement of a building can be directly determined, instead of indirectly determining the amount of displacement of a building through numerical integration, as in the case of using an acceleration sensor.

[0006] However, because this system identifies the amount of displacement of each floor during an earthquake based on images transmitted from a camera specific to each floor and calculates the inter-story deformation angle based on the identified amount of displacement of each floor, if the time of each camera is not synchronized, it is not possible to identify the amount of displacement of each floor at the same time during an earthquake. For example, even if the inter-story deformation angle of a building is calculated based on the amount of displacement of each floor at different times, it generally does not become the amount of displacement and inter-story deformation angle of each floor that can be used to evaluate the degree of damage to the building.

[0007] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a displacement measuring device that can measure the amount of displacement on each floor of a multi-story building during an earthquake without time lag, and a damage assessment system that can use this displacement measuring device to accurately assess the presence or absence of damage to a building and the extent of the damage. [Means for solving the problem]

[0008] In order to achieve the above object, one aspect of the displacement measuring device according to the present invention comprises: A displacement measurement device that measures displacement of a multi-story building during an earthquake, A plurality of reference points provided at different heights on the exterior wall of the building; A support member extending from the roof of the building to the outdoors; and an imaging device attached to the support member for simultaneously imaging the plurality of reference points.

[0009] According to this aspect, an imaging device is attached to the rooftop of a building or to a support member that protrudes from the roof to the outdoors, and the imaging device simultaneously captures images of multiple reference points set at different heights on the exterior walls of the building, thereby making it possible to capture the displacement amounts of the multiple reference points without time lag. Furthermore, since multiple reference points are captured with a single imaging device, for example, the manufacturing cost of the device can be reduced compared to when multiple imaging devices are used. Here, when capturing images of multiple reference points on multiple exterior walls that make up a building, it is desirable to apply a unique imaging device to each exterior wall.

[0010] Another aspect of the displacement measuring device according to the present invention is The support member is characterized by having rigidity that prevents relative displacement from occurring between the support member and its installation position in the building during an earthquake.

[0011] According to this aspect, the support member has enough rigidity to prevent relative displacement from occurring between the support member and its installation position in the building during an earthquake, thereby suppressing a decrease in the accuracy of the measurement values ​​regarding the amount of displacement of the building caused by the building and the imaging device displacing in different ways.

[0012] Another aspect of the displacement measuring device according to the present invention is The imaging device is characterized in that it can freely detect the distance to the reference point.

[0013] According to this aspect, since the imaging device can freely detect the distance to the reference point, the displacement amount of the reference point can be directly determined by the imaging device. For example, in a conventional method for determining the displacement amount of a building, the displacement amount of the building is indirectly determined by second-order integration of the acceleration waveform measured by a seismometer. However, according to this aspect, the displacement amount of the reference point provided on the exterior wall of the building can be directly determined by the imaging device, improving the characteristic accuracy of the displacement amount and significantly shortening the time required to determine the displacement amount.

[0014] In another aspect of the displacement measuring device according to the present invention, The reference point is a part of the outer wall.

[0015] According to this aspect, since the reference point is a part of the exterior wall, there is no need to apply a special member to the reference point, and there is also no need to install the reference point on the exterior wall, which reduces the cost of forming the displacement measuring device. Here, examples of "a part of the exterior wall" include horizontal joints between floors or in the vicinity thereof, ventilation members (grilles) protruding from the exterior wall, windows installed in the exterior wall, etc.

[0016] Another aspect of the displacement measuring device according to the present invention is The reference points are provided between floors or at predetermined positions on each floor.

[0017] According to this aspect, by providing reference points between floors or at preset positions between each floor, the three-dimensional coordinates of the reference points in normal times can be determined with high accuracy. Furthermore, for example, when reference points are provided between floors, the story height of each floor is known, so that the inter-story deformation angle can be calculated in a short time from the difference in the amount of displacement of each floor measured (determined) during an earthquake and the story height of each floor, which is preferable.

[0018] Another aspect of the displacement measuring device according to the present invention is The imaging device captures images of the plurality of reference points, and the inter-story deformation angle of the building is determined from the amount of change in the detected distance to the reference points.

[0019] According to this aspect, for example, a single imaging device is used to determine the amount of displacement of the detected distance to multiple reference points at the same time, and the inter-story deformation angle of the building is detected based on the amount of displacement of each reference point (inter-story displacement amount), making it possible to determine the inter-story deformation angle of the building with high accuracy using only the displacement measuring device.

[0020] Furthermore, one aspect of the damage assessment system according to the present invention is the displacement measuring device; an evaluation device that acquires image data from the imaging device and evaluates the degree of damage to the building; The evaluation device a storage unit that stores at least a normal coordinate of the reference point in normal times and a threshold value related to an inter-story deformation angle of the building; a calculation unit that specifies, from the imaging data of the plurality of benchmark points, the earthquake coordinates of each benchmark point when the building is displaced during an earthquake, and calculates the amount of displacement of each benchmark point during an earthquake from the normal coordinates and the earthquake coordinates, or calculates the amount of displacement during an earthquake from the imaging device and the earthquake coordinates of each benchmark point, and calculates the amount of inter-story displacement and inter-story deformation angle from the amount of displacement of each benchmark point; The building is characterized by having an evaluation unit that compares the inter-story deformation angle with the threshold value to evaluate the degree of damage to the building.

[0021] According to this aspect, the damage level of a building can be evaluated with high accuracy in the shortest possible time by calculating the displacement of each landmark during an earthquake from the earthquake coordinates of multiple landmarks measured simultaneously and the normal coordinates of each landmark, or by calculating the displacement during an earthquake from the imaging device and the respective earthquake coordinates of each landmark and then dividing the inter-story displacement, which is the difference between the displacements of each landmark, by the story height to calculate the inter-story deformation angle. For example, if the imaging device is equipped with a device capable of acquiring its own three-dimensional coordinate data, it can acquire its own three-dimensional coordinate data during an earthquake and obtain the three-dimensional coordinate data of each landmark during an earthquake from the imaging data of each landmark. Therefore, by calculating the difference between the three-dimensional coordinate data of each landmark during an earthquake and the normal coordinate data of each landmark, the displacement of each landmark during an earthquake can be identified, and the inter-story displacement of each floor can be calculated by determining the difference between the displacements of each landmark. On the other hand, if the imaging device is not equipped with a device capable of acquiring its own three-dimensional coordinate data, the amount of inter-story displacement of each floor during an earthquake can be calculated in the same way by calculating the relative distance between each reference point based on the imaging data of each reference point during an earthquake.

[0022] In another aspect of the damage assessment system according to the present invention, A seismometer is installed in the building, and thresholds for seismic waveforms and other waveforms are set in the seismometer; The imaging device is characterized in that it is configured to be turned on when the waveform measured by the seismometer reaches the threshold value.

[0023] According to this aspect, when the waveform measured by the seismometer reaches a threshold value that identifies the earthquake waveform, the power of the imaging device is turned on, and since the power of the imaging device can be turned on only when an earthquake occurs, it is possible to reduce running costs, such as electricity consumption. Here, the imaging device and the seismometer are connected so that signals can be transmitted and received either wirelessly or via a wire, and a power-on signal is sent from the seismometer to the imaging device.

[0024] In another aspect of the damage assessment system according to the present invention, the evaluation device further includes a communication unit, The imaging data transmitted from the imaging device via a network is received by the communication unit.

[0025] According to this aspect, the imaging data transmitted from the imaging device via a network is received by the communication unit of the evaluation device, and therefore the imaging device and evaluation device, which are located far from each other, can be connected so as to be able to send and receive data, in cases where the evaluation device is installed in a management office or the like of a building (such as a building or condominium) in which the displacement measuring device is installed, as well as in cases where the evaluation device is installed in a management office of a management company or the like that is remote from the building and manages or maintains the building, or in a management office of a construction company or the like that constructed the building. [Effects of the Invention]

[0026] As can be understood from the above explanation, the displacement measuring device and damage assessment system of the present invention can measure the amount of displacement of each floor of a multi-story building during an earthquake without time lag, and can accurately assess the presence or absence of damage to the building and the extent of the damage. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a diagram showing an overall configuration of an example of a displacement measuring device and a damage evaluation system according to an embodiment; [Figure 2A] 2 is a view taken in the direction of the arrow II in FIG. 1, showing an example of a plurality of reference points provided on the outer wall of a building. FIG. [Figure 2B] 2 is a view taken in the direction of the arrow II in FIG. 1, showing another example of a plurality of reference points provided on the outer wall of a building. FIG. [Figure 3] FIG. 2 illustrates an example of a hardware configuration of an evaluation device. [Figure 4] FIG. 2 illustrates an example of a functional configuration of an evaluation device. [Figure 5]This is a diagram showing the coordinates of each benchmark during normal times and during an earthquake, along with the amount of displacement during the earthquake. [Figure 6] FIG. 10 is a diagram illustrating another example of an installation form of the imaging device in a building. DETAILED DESCRIPTION OF THE INVENTION

[0028] Hereinafter, an example of a displacement measurement device and a damage assessment system according to an embodiment will be described with reference to the accompanying drawings. Note that in this specification and the drawings, substantially identical components may be designated by the same reference numerals to avoid redundant description.

[0029] [Displacement measurement device and damage assessment system according to the embodiment] An example of a displacement measuring device and a damage evaluation system according to an embodiment will be described with reference to FIGS. 1 to 6. FIG.

[0030] The displacement measuring device 50 is a device that measures displacement of a multi-story (seven-story) building B during an earthquake. The displacement measuring device 50 has a plurality of (seven in the illustrated example) reference points 30 provided at different heights on the exterior wall W of building B, a support member 20 that protrudes outdoors from the roof B1 of building B, and an imaging device 10 that is attached to the support member 20 and simultaneously captures images of the plurality of reference points 30. Here, the support member may protrude from the roof of the building, and any configuration is acceptable as long as the imaging device can simultaneously capture images of at least the plurality of reference points provided on the exterior wall of the building.

[0031] The support member 20 has high rigidity in both the fixed part fixed to the roof B1 and the main body of the support member, and has a strong structure so that when building B vibrates during an earthquake, the support member 20 supporting the imaging device 10 does not produce vibrations different from those of building B (it vibrates in the same way as building B, becoming one with building B).

[0032] In the illustrated example, a thick base plate 22 is fixed to a roof B1 made of, for example, reinforced concrete via a plurality of anchor bolts 23, and the legs of a support frame 21 that is L-shaped in side view are welded to the base plate 22.

[0033] The legs of the support frame 21 and the base plate 22 are further fixed to each other by a plurality of reinforcing ribs 24 .

[0034] The support frame 21 is formed from highly rigid steel members such as square steel pipes, steel pipes, or H-shaped steel beams, and the L-shaped bent portion of the support frame 21 is reinforced with braces 25 made of shaped steel or the like. Although not shown, one end of a cable may be fixed to the L-shaped bent portion of the support frame 21 and the other end of the cable may be fixed to another area of ​​the rooftop B1, thereby increasing the stability of the cantilevered support frame 21. Note that there are various other highly rigid support members besides those shown in the examples.

[0035] The imaging device 10 is fixed to the tip of the support frame 21 via an angle adjustment mechanism (not shown), and the imaging device 10 is adjusted to an angle that allows it to capture an image of the entire plurality of reference points 30 provided on the exterior wall W.

[0036] Various devices capable of acquiring coordinate data (e.g., three-dimensional coordinate data) of reference points, such as a 3D camera or a 3D scanner (LRF (Laser Range Finder)), can be used as the imaging device 10. Furthermore, a strobe may be attached to the imaging device 10 so that the imaging device 10 can clearly image each reference point 30 even at night, and lighting equipment (not shown) may be provided near each reference point 30 so that the area around the reference point can be clearly imaged at night.

[0037] As shown in Fig. 2A, a plurality of reference points 30 are provided at a plurality of positions on the exterior wall W that are spaced apart in the height direction. In the illustrated example, a plurality of reference points 30 are provided on an imaginary straight line (dash-dotted line) that vertically cuts through the horizontal joints m between each floor. The reference points 30 may be marking members made of a luminescent material that can be clearly imaged by the imaging device 10 even at night, and are fixed to the horizontal joints m between floors via fixing means (nails, screws, screws, etc.) not shown, for example.

[0038] 2B, the reference point 30A may be set on an imaginary straight line (dash-dotted line) that vertically crosses the horizontal joint m between each floor. In this case, the work of attaching a reference point to the exterior wall W is not required, which leads to a reduction in the manufacturing cost of the displacement measuring device 50. Here, markings that serve as the reference points 30A may be attached to each point on the vertical line of the horizontal joint m between each floor.

[0039] Returning to FIG. 1, a seismometer 60 is installed in building B, and the seismometer 60 and the imaging device 10 are connected by wire or wirelessly.

[0040] Seismometer 60 is set with thresholds for earthquake waveforms due to seismic motion E propagating through ground G and for other waveforms caused by traffic vibrations, etc. When the waveform measured by seismometer 60 reaches the threshold, imaging device 10 receives a power-on signal from seismometer 60, and the power of imaging device 10 is turned on.

[0041] With this configuration, the power of the imaging device 10 is normally turned off, and when seismic motion E propagates to building B, the power of the imaging device 10 is automatically turned on, thereby reducing running costs, such as the amount of electricity used by the imaging device 10.

[0042] The damage assessment system 100 includes a displacement measurement device 50 and an assessment device 80 located at a management company M located away from a building B that is the target of damage assessment. In addition to the illustrated example, the assessment device 80 may be installed in a management office in the building B that is the target of damage assessment, in a management department such as the head office or branch office of the construction company that built building B, or as a server device on the cloud.

[0043] Coordinate data of each reference point 30 measured by the imaging device 10 at the time of an earthquake is transmitted to the evaluation device 80 via the network 70. For example, the three-dimensional coordinates of the imaging device 10, such as a 3D camera supported by the support member 20, are determined in advance based on survey control points in the vicinity of the building B, and the three-dimensional coordinates of each reference point 30 are determined from these three-dimensional coordinates and the measurement values ​​(coordinate data) of each reference point 30 measured by the imaging device 10. Alternatively, the imaging device 10 may be equipped with a GPS (Global Positioning System) or the like, and may acquire its own three-dimensional coordinate data via the GPS or the like.

[0044] The evaluation device 80 determines the amount of displacement of each reference point 30 from normal times based on the received coordinate data of each reference point 30 during an earthquake, and determines the inter-story deformation angle of each floor from the amount of displacement and the story height. That is, as shown in Figures 2A and 2B, because each reference point 30, 30A is provided between each floor, the vertical distance between each reference point is the story height of each floor. Therefore, by finding the difference in the amount of displacement (inter-story displacement) of each determined reference point 30, 30A and dividing the inter-story displacement by the story height, the inter-story deformation angle of each floor can be determined in a short time.

[0045] The network 70 includes a public network such as the Internet, a wireless network such as a mobile phone network, a dedicated network such as a VPN (Virtual Private Network), a LAN (Local Area Network), and the like.

[0046] In this way, the damage assessment system 100 is a system in which the displacement measuring device 50 and the assessment device 80 are connected via the network 70, but it may also be configured in such a way that, for example, an administrator or the like directly obtains the measurement data measured by the imaging device 10 from the imaging device 10 and inputs the data into the assessment device 80.

[0047] Next, an example of the hardware configuration of the evaluation device 80 will be described with reference to FIG. 3, and an example of the functional configuration of the evaluation device 80 will be described with reference to FIG.

[0048] As shown in FIG. 3, the evaluation device 80 is configured by an information processing device (computer) such as a personal computer (PC).

[0049] The computer constituting the evaluation device 80 includes a CPU (Central Processing Unit) 81, a main memory device 82, an auxiliary memory device 83, a communication IF (interface) 84, and an input / output IF 84, which are interconnected by a connection bus 86. The main memory device 82 and the auxiliary memory device 83 are computer-readable recording media. Note that the above components may be provided separately, or some of the components may not be provided.

[0050] The CPU 81 is also called an MPU (Microprocessor) or a processor, and may be a single processor or a multiprocessor. The CPU 81 is a central processing unit that performs overall control of the evaluation device 80, which is made up of a computer. The CPU 81, for example, deploys a program stored in the auxiliary storage device 83 in an executable manner in the working area of ​​the main storage device 82, and controls peripheral devices through the execution of the program, thereby providing functions that meet a predetermined purpose.

[0051] The main storage device 82 stores computer programs executed by the CPU 81, data processed by the CPU 81, etc. The main storage device 82 includes, for example, a flash memory, a RAM (Random Access Memory), and a ROM (Read Only Memory). The auxiliary storage device 83 stores various programs and various data on a readable and writable recording medium, and is also called an external storage device. The auxiliary storage device 83 stores, for example, an OS (Operating System), various programs, various tables, etc. The OS includes, for example, a communication interface program that exchanges data with external devices connected via the communication IF 84. External devices for the evaluation device 80 include the imaging device 10, etc.

[0052] The auxiliary storage device 83 is used, for example, as a storage area that supplements the main storage device 82, and stores computer programs executed by the CPU 81, data processed by the CPU 81, etc. The auxiliary storage device 83 is a silicon disk including nonvolatile semiconductor memory (flash memory, EPROM (Erasable Programmable ROM)), a hard disk drive (HDD: Hard Disk Drive), a solid state drive, etc. Examples of the auxiliary storage device 83 include drives for removable recording media such as CD drives, DVD drives, and BD drives, and examples of removable recording media include CDs, DVDs, BDs, USB (Universal Serial Bus) memories, and SD (Secure Digital) memory cards.

[0053] The input / output IF 85 is an interface for inputting and outputting data between devices connected to the evaluation device 80. Input devices such as a keyboard, a touch panel, a mouse, or other pointing device, and a microphone are connected to the input / output IF 85. The evaluation device 80 receives operation instructions and the like from an operator who operates the input device via the input / output IF 85.

[0054] Furthermore, output devices such as display devices, such as liquid crystal panels (LCD: Liquid Crystal Display) and organic EL panels (EL: Electroluminescence), printers, speakers, etc. are connected to the input / output IF 85. The evaluation device 80 displays, for example, the displacement of each reference point 30 of building B during an earthquake, and the inter-story deformation angle of each floor calculated based on this displacement.

[0055] The communication IF 84 is an interface with the network 70 to which the evaluation device 80 is connected. The communication IF 84 receives measurement data from the imaging device 10 via various networks 70 including the above-mentioned public network such as the Internet.

[0056] 4, the evaluation device 80 provides various functions of at least a communication unit 802, a calculation unit 804, an evaluation unit 806, a display unit 808, and a storage unit 810 by executing a program by a CPU 81. Here, at least a part of the processing functions may be provided by a DSP (Digital Signal Processor), a GPU (Graphics Processing Unit), or the like, and similarly, at least a part of the processing functions may be provided by a dedicated LSI (Large Scale Integration) such as an FPGA (Field-Programmable Gate Array), a numerical calculation processor, an image processing processor, or other digital circuits, or the like.

[0057] The communication unit 802 receives imaging data (coordinate data) of a plurality of reference points 30 that are simultaneously captured by the imaging device 10 and transmitted from the imaging device 10.

[0058] The storage unit 810 stores (memorizes) the normal coordinates of each reference point 30 in normal times. Here, Fig. 5 is a diagram showing the coordinates of each reference point in normal times and during an earthquake, along with the amount of displacement during an earthquake, in which building B in normal times is shown by a dashed dotted line, and building B displaced by horizontal force H acting during an earthquake is shown by a solid line.

[0059] For example, the normal coordinate data P0 (x0, y0, z0) of the imaging device 10 in normal times, and the normal coordinate data of each of the reference points 30a to 30g from the normal coordinate data (x2, y2, z7) of the reference point 30a installed on the top floor to the normal coordinate data (x2, y2, z1) of the reference point 30g installed on the bottom floor are stored in the storage unit 810.

[0060] If the imaging device 10 is equipped with a GPS or the like, the earthquake coordinate data P1 (x1, y1, z1) of the imaging device 10 when the building B is horizontally displaced during an earthquake can be instantly identified.

[0061] Based on the earthquake coordinate data (x1, y1, z1) of the imaging device 10 and the imaging data of each of the reference points 30a to 30g by the imaging device 10, the earthquake coordinates of each of the reference points 30a to 30g at the time of the earthquake (for example, earthquake coordinate data (x3, y2, z7) of the reference point 30a, and earthquake coordinate data (x9, y2, z1) of the reference point 30g) are identified.

[0062] During an earthquake, horizontal forces H act alternately on building B, for example, in the left and right directions, causing repeated horizontal displacement of building B. Therefore, the imaging device 10 continuously captures images of each of the reference points 30a to 30g, and continuously acquires earthquake coordinate data based on this continuous imaging. The acquired earthquake coordinate data of each of the reference points 30a to 30g is stored in storage unit 810.

[0063] Since the images of the reference points 30a to 30g are captured simultaneously by the common imaging device 10, the storage unit 810 stores the same number of combinations of earthquake coordinate data of the reference points 30a to 30g at the same time as the number of imaging times (different imaging times).

[0064] The calculation unit 804 calculates the difference between the three-dimensional coordinate data of each of the reference points 30a to 30g during normal times and during an earthquake, and identifies the amount of displacement. As shown in Fig. 5, each of the reference points 30a to 30g is displaced by δ1 to δ7 in the direction of the horizontal force H. Here, the displacement amount δ1 of the reference point 30a is obtained from the difference (S1 - J) between the difference value S1 of the three-dimensional coordinate data between normal times and during an earthquake and the horizontal displacement amount J of the ground G. The displacement amounts δ2 to δ7 of the other reference points 30b to 30g are calculated in a similar manner (for example, the displacement amount δ2 of the reference point 30b: δ2 = S2 - J).

[0065] The storage unit 810 stores the same number of combinations of earthquake coordinate data for each of the reference points 30a to 30g at the same time as the number of times images are taken, and therefore the displacement of each of the reference points 30a to 30g at each image taking time is calculated.

[0066] The calculation unit 804 performs a calculation to divide the inter-story displacement amount, which is the difference value of the displacement amount of each of the reference points 30a to 30g (for example, δ1-δ2, δ2-δ3, etc.), by the story height, and calculates the inter-story deformation angle of each story.

[0067] Since the inter-story deformation angle of each floor can reach its maximum at different times, the maximum inter-story deformation angle for each floor is extracted for each floor from the inter-story deformation angles for each floor at multiple times calculated according to the number of times the images are taken.

[0068] Here, if the imaging device 10 is not equipped with a GPS or the like, the imaging device 10, which is installed in building B via a rigid support member 20, will displace in the same manner as building B in synchronization with it. Therefore, from the imaging data (earthquake coordinate data) of each reference point 30a to 30g imaged at the same time, each coordinate value of the axial direction (x direction in the illustrated example) displaced by the horizontal force H can be obtained (this x coordinate is not an absolute coordinate), and the calculation unit 804 can obtain the difference value of the x coordinate of each reference point to obtain the inter-story displacement amount similar to δ1-δ2, δ2-δ3, etc. described above.

[0069] Furthermore, when the imaging device 10 is not equipped with a GPS or the like, a survey reference point Pr (xr1, yr, zr) with known three-dimensional coordinates may be provided on the ground surface directly below the imaging device 10, as shown in Fig. 5. The three-dimensional coordinates of each of the reference points 30a to 30g in normal times are measured based on this survey reference point Pr (xr1, yr, zr), and during an earthquake, the survey reference point Pr is imaged (the three-dimensional coordinates Pr (xr2, yr, zr) after displacement), and the movement distance of the imaging device 10 is calculated, thereby making it possible to identify the amount of displacement of each of the reference points 30a to 30g.

[0070] The storage unit 810 stores a plurality of threshold values ​​related to the inter-story deformation angle of the building B. The plurality of threshold values ​​of the inter-story deformation angle are related to the damage level (or damage level) of the building B.

[0071] For example, the threshold value of the inter-story deformation angle: θ1 = 1 / 200 can be set as the threshold value for minor damage and below, and the threshold value of the inter-story deformation angle: θ2 = 1 / 100 can be set as the threshold value for minor damage and medium damage.

[0072] The evaluation unit 806 refers to each threshold value of the inter-story deformation angle stored in the storage unit 810, and compares the (maximum value of) the inter-story deformation angle of each floor with each threshold value to evaluate the damage level of each floor of building B.

[0073] The display unit 808 displays the evaluation results regarding the (maximum) inter-story deformation angle and damage level of each floor.

[0074] The displacement measuring device 50 can measure the amount of displacement of each floor of a multi-story building B during an earthquake without any time lag. As a result, the damage assessment system 100 equipped with the displacement measuring device 50 can accurately assess the presence or absence of damage to building B and the extent of the damage.

[0075] Fig. 6 is a diagram showing another example of the installation form of the imaging device relative to a building. When building B is a high-rise building or an ultra-high-rise building, deformation of a higher mode than the second-order mode may occur in the vibration mode of building B. For example, in the case of the deformation mode shown in Fig. 6, a form having only the imaging device 10 corresponding to one exterior wall W cannot handle the case where the imaging device 10 cannot simultaneously image all of the reference points 30.

[0076] In the example shown in FIG. 6, the left imaging device 10 cannot capture images of all the reference points 30 simultaneously because the reference points 30 are outside the imaging range.

[0077] Therefore, as shown in the illustrated example, a separate imaging device 10 corresponding to the right exterior wall W is further mounted on building B, and the left and right displacement measuring devices 50 are configured so that during an earthquake, the left and right (multiple) imaging devices 10 simultaneously capture images of multiple reference points 30 on the corresponding exterior walls W.This makes it possible to simultaneously capture images of all reference points 30 by one imaging device 10 at a time when the other imaging device 10 cannot simultaneously capture images of all reference points 30.

[0078] Although not shown in the drawings, in a building that is rectangular in plan view, it is preferable to equip the building with a displacement measuring device 50 corresponding to each of the four exterior walls. Also, in a building that is circular, elliptical, or polygonal other than rectangular in plan view, it is preferable to equip the building with displacement measuring devices 50 in appropriate locations that can simultaneously capture images of all reference points in the event of any deformation mode that may occur.

[0079] The present invention is not limited to the configurations shown here, and other embodiments may be possible in which other components are combined with the configurations described in the above embodiments. In this regard, the present invention can be modified within the scope of the present invention, and can be appropriately determined depending on the application form. [Explanation of symbols]

[0080] 10: Imaging device 20: Support member 21: Support frame 22: Base plate, 23: Anchor bolt 24: Reinforcement rib 25: Cheek rest 30,30A,30a~30g: Gauge 50: Displacement measuring device 60: Seismograph 70: Network 80: Evaluation device 100: Damage Assessment System 802: Communications Department 804: Calculation Department 806: Evaluation Department 808: Display section 810: Storage area G: Ground B: Building B1: Rooftop W: Exterior wall E: Earthquake motion M: Management company m: horizontal joint H:Horizontal force

Claims

1. A displacement measurement device that measures displacement of a multi-story building during an earthquake, A plurality of reference points provided at different heights on the exterior wall of the building; A support member extending from the roof of the building to the outdoors; an imaging device attached to the support member and configured to simultaneously image the plurality of reference points.

2. 2. The displacement measuring device according to claim 1, wherein the support member has a rigidity that prevents relative displacement from occurring between the support member and its installation position in the building during an earthquake.

3. 3. The displacement measuring device according to claim 1, wherein the imaging device is capable of detecting a distance to a reference point.

4. The displacement measuring device according to claim 1 , wherein the reference point is a part of the outer wall.

5. 5. The displacement measuring device according to claim 1, wherein the reference points are provided between floors or at predetermined positions.

6. 6. The displacement measuring device according to claim 1, wherein the inter-story deformation angle of the building is determined from the amount of displacement of the detected distance to the reference point by capturing images of the plurality of reference points by the imaging device.

7. A displacement measuring device according to any one of claims 1 to 6; an evaluation device that acquires image data from the imaging device and evaluates the degree of damage to the building; The evaluation device a storage unit that stores at least a normal coordinate of the reference point in normal times and a threshold value related to an inter-story deformation angle of the building; a calculation unit that identifies, from the imaging data of the plurality of benchmark points, the earthquake coordinates of each benchmark point when the building is displaced during an earthquake, calculates the amount of displacement of each benchmark point during an earthquake from the normal coordinates and the earthquake coordinates, and calculates the amount of inter-story displacement and the inter-story deformation angle from the amount of displacement of each benchmark point; a damage assessment system comprising an assessment unit that assesses the damage level of the building by comparing the inter-story deformation angle with the threshold value.

8. a seismometer is installed in the building, and a threshold value for a seismic waveform is set in the seismometer; 8. The damage assessment system according to claim 7, wherein the imaging device is configured to be turned on when the waveform measured by the seismometer reaches the threshold value.

9. the evaluation device further includes a communication unit, 9. The damage assessment system according to claim 7, wherein the imaging data transmitted from the imaging device via a network is received by the communication unit.

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