Relative story displacement recording system

Abstract

To provide a relative story displacement recording system which records relative story displacement even when a power source is lost due to blackout by an earthquake.SOLUTION: A recording device 13 includes a recording surface which is fixed at least in a horizontal direction to a structure (beam 83) belonging to one of a plurality of stories of a building 80 so as to be arranged in a substantially horizontal manner. A contact maker 12 is fixed at least in a horizontal direction to a structure (beam 82) belonging to a story different from the story of the structure (beam 83) of the building 80 so as to be arranged contacting with the recording surface of the recording device 13. The recording device 13 records a position contacted by the contact maker 12 on the recording surface without consuming power.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a system for recording inter-story displacement of a building caused by an earthquake or the like. [Background technology]

[0002] Patent Document 1 discloses a system for diagnosing the soundness of a building against earthquake shaking. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-181887 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 discloses the use of a laser displacement sensor as a displacement sensor. However, if an earthquake causes a power outage, the laser displacement sensor may not work and may not be able to detect displacement. The present invention aims to solve such problems, for example. [Means for solving the problem]

[0005] The story displacement recording system includes a recording device and a contact device. The recording device has a recording surface that is fixed at least in the horizontal direction to a structure that belongs to any one of the stories of a building having multiple stories and is arranged approximately horizontally. The contact device is fixed at least in the horizontal direction to a structure that belongs to a story different from the structure of the building and is arranged to contact the recording surface of the recording device. The recording device records the position where the contact device contacts the recording surface without consuming power. Effect of the Invention

[0006] Since the recording device records the position where the contact device comes into contact with the recording surface, the inter-story displacement can be recorded even if the power source is lost due to a power outage caused by an earthquake or the like. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is a side view showing an example of an interlayer displacement recording system. [Diagram 2] FIG. 1 is a plan view showing an example of a recording apparatus. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Referring to FIG. 1, a layer displacement recording system 10 will be described. The story displacement recording system 10 records horizontal story displacements occurring in a building 80 due to an earthquake or the like. The layer displacement recording system 10 includes, for example, a contact device 12, a recording device 13, an imaging device 14, an analysis device 15, and fixed units 16 and 17.

[0009] The recording device 13 has, for example, a recording surface 31 (see FIG. 2) that is disposed substantially horizontally. The recording device 13 is fixed to the beam 83 of the building 80 at least in the horizontal direction (direction perpendicular to the ±Z directions). For example, the recording device 13 is fixed to the upper surface (the surface on the +Z side) of the fixing part 17 fixed to the beam 83, and thereby fixed to the beam 83 via the fixing part 17. As a result, the recording surface 31 is fixed to the beam 83 of the building 80 at least in the horizontal direction. The fixing part 17 may be fixed not only to the beam 83 but also to a structure (such as a floor) belonging to any story of the building 80. The recording device 13 may be fixed directly to a structure such as the beam 83 or a floor without using the fixing part 17.

[0010] The contact device 12 is fixed at least in the horizontal direction to a beam 82 of a different story (e.g., the story one story above) from the beam 83 of the building 80. For example, the contact device 12 is fixed to the lower end (the end on the -Z side) of the fixing part 16 fixed to the beam 82, and thereby fixed to the beam 82 via the fixing part 16. The fixing portion 16 is not limited to the beam 82, and may be fixed to a structure (such as a floor) that belongs to a layer different from the layer to which the structure to which the recording device 13 is fixed belongs. The contact device 12 may be fixed directly to a structure such as the beam 82 or a floor without using the fixing portion 16. The contact device 12 is disposed so that, for example, its tip portion extending thinly downward (-Z side) comes into contact with the recording surface 31 of the recording device 13. It is desirable that the area of ​​the portion where the tip portion comes into contact with the recording surface 31 is sufficiently small so that recording with the required accuracy can be performed.

[0011] At least one of the contact device 12 and the recording device 13 may be movable in the vertical direction (±Z direction) relative to the beams 82 and 83, and may be biased by a weight, a spring, or the like in a direction in which the contact device 12 and the recording device 13 approach each other. In this way, even if the vertical distance between the beams 82 and 83 changes due to earthquake shaking or the like, the contact device 12 can always remain in contact with the recording surface 31 of the recording device 13.

[0012] The recording device 13 records the position where the contact device 12 contacts the recording surface 31 without consuming power. Since the contact device 12 is fixed to the beam 82 and the recording device 13 is fixed to the beam 83, when the horizontal positional relationship between the beams 82 and 83 changes due to shaking caused by an earthquake, the position at which the contact device 12 contacts the recording surface 31 changes accordingly. By recording this, the maximum inter-storey displacement amount is recorded, and after the earthquake has ended, it is possible to grasp the maximum inter-storey deformation angle caused by the earthquake, which can greatly reduce the effort required for damage investigation of the building 80. When recording the acceleration caused by an earthquake and calculating the amount of displacement from the recorded acceleration, it is necessary to perform integration twice, which amplifies the error and makes it difficult to grasp the maximum inter-story drift angle with high accuracy.In contrast, the recording device 13 directly records the amount of displacement caused by an earthquake, so it is possible to grasp the maximum inter-story drift angle with high accuracy.

[0013] The recording surface 31 of the recording device 13 records the position where the contact device 12 makes contact, for example, by changing color at the position. In this way, the maximum interlayer displacement amount can be easily grasped by visually checking the recording surface 31. For example, contact device 12 may be a writing implement, such as a pencil, and recording surface 31 may be paper.

[0014] Alternatively, the contact device 12 may be a touch pen and the recording device 13 may be an electronic note pad. Some electronic memo pads only require power when erasing, and do not require power when recording. Using these eliminates the need for standby power while waiting for an earthquake, which may strike at any time, and prevents data from being missed due to loss of power due to a power outage or dead battery. Furthermore, since less contact pressure is required than when using a writing implement, friction is reduced and the vibrations can be recorded more accurately.

[0015] The photographing device 14 photographs the recording surface 31 of the recording device 13. Since the amount of displacement is recorded on the recording surface 31, the photographing device 14 only needs to photograph a still image of the recording surface 31, and does not need to photograph a moving image. Even if a power outage occurs due to an earthquake, photographing can be performed after the power outage is restored. The photographing device 14 transmits the photographed image to the analyzing device 15. This enables automatic analysis of the amount of displacement recorded by the recording device 13. The image may be transmitted via a network such as a wireless LAN (local area network) installed in the building 80, or may be transmitted via a public communication line. The photographing device 14 may be fixedly installed in the building 80 as shown in Fig. 1, or may be portable, for example, carried by an investigator. Also, for example, the recording device 13 may be installed in a position where it is captured by a security camera installed in the building 80, and the security camera may be used as the photographing device 14.

[0016] The analysis device 15 is, for example, a computer such as a server device. The analysis device 15 may be located inside the building 80 or may be located in a place other than the building 80, and it is sufficient if the analysis device 15 can receive the images transmitted by the image capture device 14 via a network or the like. The analysis device 15 calculates the maximum inter-story displacement in the horizontal direction between the beams 82 and 83 by analyzing the image received from the photographing device 14. For example, from among the pixels constituting the image photographed by the photographing device 14, pixels in the area discolored due to the contact device 12 contacting the recording surface 31 are extracted, and for each of the extracted pixels, the actual distance from the origin (the position where the contact device 12 was in contact with the recording surface 31 before the earthquake occurred) is calculated, and the maximum of the calculated distances is determined to be the maximum inter-story displacement.

[0017] The analysis device 15 may calculate the maximum inter-story deformation angle based on the calculated maximum inter-story displacement and the distance (inter-story distance) in the vertical direction (±Z direction) between the beams 82 and 83. For example, the analysis device 15 calculates a quotient by dividing the calculated maximum inter-story displacement by the inter-story distance stored in advance, and determines the arc tangent of the calculated quotient to be the maximum inter-story deformation angle.

[0018] The recording device 13 will now be described in detail with reference to FIG. Recording device 13 has marks 32 to 37 for facilitating image analysis by analysis device 15. The marks 32 to 37 are arranged at positions that appear in an image captured by the photographing device 14. The marks 32 to 37 may be arranged within the recording surface 31, for example, by writing on the recording surface 31 with a touch pen, or may be arranged at positions adjacent to the recording surface 31.

[0019] The linear marks 32 and 33 indicate the origin (the position where the contact device 12 contacts the recording surface 31 before an earthquake occurs). In other words, the point where the two marks 32 and 33 intersect indicates the origin. Note that the marks 32 and 33 do not need to be continuous, and may be, for example, a broken line, or only both ends. In that case, the position where imaginary straight lines connecting both ends of the marks 32 and 33 intersect indicates the origin. The analysis device 15 extracts the marks 32 and 33 by analyzing the image captured by the image capture device 14, and determines the position of the origin in the image based on the extracted marks 32 and 33.

[0020] The dotted marks 34 to 36 indicate reference lengths. That is, the distance between the marks 34 and 35 is a predetermined length, and the distance between the marks 35 and 36 is also a predetermined length. Moreover, when viewed from the mark 35, the marks 34 and 36 are disposed in directions that differ by exactly 90 degrees. The analysis device 15 analyzes the image captured by the image capturing device 14 to extract the marks 34-36, and determines a reference length based on the extracted marks 34-36. Furthermore, if the photographing device 14 does not photograph the recording surface 31 from the front, the recording surface 31 will appear distorted in the image photographed by the photographing device 14. The analysis device 15 detects distortion of the recording surface 31 based on the positional relationship of the extracted marks 34 to 36 in the image, and corrects the detected distortion. This makes it possible to accurately grasp the maximum inter-story displacement amount even if the photographing device 14 is not fixedly disposed.

[0021] Mark 37 indicates a direction, for example an arrow or the letter "N" indicating north. The analysis device 15 analyzes the image captured by the image capture device 14 to extract the mark 37, and based on the extracted mark 37, ascertains the direction (for example, north-south or east-west).

[0022] When the marks 32 to 37 are written on the recording surface 31, it is preferable to place the marks 34 to 37 at positions far enough from the origin so as not to overlap with the area discolored due to contact of the contact device 12 with the recording surface 31. It is also preferable to place the marks 32 and 33 at positions far enough from the origin so that both ends do not overlap with the discolored area. In this way, even if the middle parts of the marks 32 and 33 overlap with the discolored area, the analysis device 15 can grasp the position of the origin.

[0023] The analysis device 15 calculates the actual distance of each pixel from the origin based on the position of the origin ascertained from the marks 32 to 37, a reference length, and the like, and calculates the maximum amount of inter-story displacement. Furthermore, the analysis device 15 may calculate the maximum amount of inter-storey displacement in a predetermined direction based on the determined orientation. For example, the direction in which the columns 81 of the building 80 are arranged is stored in advance, and the maximum amount of inter-storey displacement in the direction in which the columns 81 are arranged is calculated.

[0024] The mark indicating the direction may not indicate an absolute direction such as north, but may indicate a relative direction to the building 80, such as the direction in which the pillars 81 are lined up. In addition, two or more of the position of the origin, the reference length, the direction, etc. may be indicated by one mark.

[0025] As described above, the recording device 13 records the position where the contact device 12 comes into contact with the recording surface 31 without consuming power, so that inter-story displacement caused by an earthquake or the like can be recorded even during a power outage, and the maximum amount of inter-story displacement can be easily determined.

[0026] The above-described embodiment is an example for facilitating understanding of the present invention. The present invention is not limited thereto, and includes various modifications, changes, additions, or deletions without departing from the scope defined by the appended claims. This can be easily understood by those skilled in the art from the above description.

[0027] When a major earthquake occurs, it is necessary to determine whether or not damaged buildings can continue to be used, and from the perspective of business continuity, it is necessary to quickly investigate and determine the extent of damage to buildings. In general, the maximum story drift angle experienced by a building is used as an indicator for evaluating the soundness of damaged buildings. Therefore, if story drift angles during earthquakes can be recorded cheaply, accurately, and simply, it will help reduce the labor required for damage assessment. The story displacement recording system makes it possible to obtain the maximum story displacement angle experienced by a building after an earthquake inexpensively, accurately, and easily. A writing tablet (electronic memo pad) is used to directly record the history of the building's inter-story displacement. Writing tablets require power only when erasing records, and are commercially available at low cost, and do not require power when recording. Similar tablets are used. Furthermore, if about three markers and directions are written on the writing tablet in advance, the relationship between the absolute amount of displacement and direction can be determined from still image data captured with the writing tablet alone, and the maximum inter-story displacement angle in each direction between the building's girders and floors can be ascertained. If linked with the online image data transmission function, it is possible to determine from a distance whether the target building can continue to be used. Unlike indirect assessments, which measure the acceleration, classify the magnitude of shaking as seismic intensity, and compare it with past damage data to determine the soundness of a building, this method allows for a direct assessment. Unlike the case where displacement is calculated from acceleration through two integration processes (acceleration → velocity → displacement), this method makes it possible to obtain the correct displacement. Unlike the case where the residual deformation of a building after an earthquake is actually measured and the maximum story drift angle experienced is estimated, there is no need to spend a great deal of time and effort on on-site surveys, etc. A marking board with a writing tablet is used. If a security camera is installed, images can be sent. The deformation history can also be visually observed. The writing tablet does not require a power source when recording, and only needs a power source when erasing the records. The maximum inter-story displacement in the X and Y directions can be grasped from the digital data of still images alone. It is possible to directly record the history of horizontal story displacements of buildings caused by earthquakes. Since it is possible to grasp the maximum value of the inter-story deformation angle experienced by the building, it is possible to directly evaluate the soundness of the damaged building. Since the maximum story deformation angles in each direction of the building's span and floor space can be determined solely from still image data that can be transmitted online, there is no need to conduct on-site surveys of damaged buildings, which significantly reduces the effort required for damage surveys. The object of recording is horizontal story displacement, not acceleration, which directly relates to the evaluation of the soundness of damaged buildings. The recording device itself does not need to be connected to a power source, so records can be kept even in the event of a power outage. The deformation of the building can be visually grasped from the recorded results. It can be constructed using inexpensive parts and materials. It can be installed in a variety of buildings regardless of their purpose, thereby improving business continuity. This will reduce the amount of work required by investigators to assess the extent of damage when a large earthquake occurs. [Explanation of symbols]

[0028] 10 Inter-story displacement recording system, 12 Contact device, 13 Recording device, 14 Photographing device, 15 Analysis device, 16, 17 Fixed part, 31 Recording surface, 32-37 Marks, 80 Building, 81 Column, 82, 83 Beam.

Claims

1. A recording device having a recording surface that is fixed at least in a horizontal direction to a structure belonging to any one of the stories of a building having a plurality of stories and disposed approximately horizontally; a contact device fixed at least in a horizontal direction to a structure belonging to a different floor from the structure of the building and arranged to contact the recording surface of the recording device; Equipped with The recording device records the position where the contact device contacts the recording surface without consuming power. Inter-storey displacement recording system.

2. the recording device records the position where the contact device contacts the recording surface by discoloring the position where the contact device contacts the recording surface; The layer displacement recording system according to claim 1.

3. The recording device further includes an image capturing device for capturing an image of the recording surface of the recording device. The layer displacement recording system according to claim 2.

4. The structure further includes an analysis device that analyzes the image captured by the imaging device and calculates a maximum inter-story displacement amount. The layer displacement recording system according to claim 3.

5. The photographing device photographs a mark indicating at least one of an origin, a length, and a direction together with the recording surface; The analysis device calculates the maximum inter-story displacement amount based on the mark photographed by the photographing device.

5. The layer displacement recording system according to claim 4.

6. The mark is provided on the recording surface. The layer displacement recording system according to claim 5.

7. The recording device is an electronic memo pad, The contact device is a touch pen.

7. The layer displacement recording system according to claim 1.

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