Bridge soundness evaluation system

Abstract

To solve the problems of the related art, that is, to provide a bridge soundness evaluation system capable of understanding a place where a smartphone is installed and measuring acceleration by a firmly fixed smartphone.SOLUTION: The bridge soundness evaluation system of the present invention evaluates the soundness of a bridge and includes smartphone with a built-in accelerometer, an installation table, and measurement data analysis means. An accommodation space for accommodating the smartphone has a concave shape recessed from the upper surface of the installation table and is formed to have a size for accommodating the substantially horizontal smartphone. Then, the soundness of a bridge can be evaluated based on the result analyzed by the measurement data analysis means.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to bridge maintenance and management, and more specifically to a bridge health assessment system that can assess the health of a bridge based on measurement data acquired by an acceleration sensor built into a smartphone. [Background technology]

[0002] It has been pointed out that the construction infrastructure (hereafter referred to as "construction infrastructure"), which was developed intensively during the period of high economic growth, is already showing signs of considerable deterioration. In 2014, the Council for Social Capital Development compiled a "Recommendation for Full-scale Implementation of Measures to Counteract Aging Roads," which cited the Sasago Tunnel accident of 2012 as an example, sounding the alarm that "in the near future, this will lead to fatal incidents, such as bridge collapses, affecting human lives and social infrastructure," and strongly advocated the importance of maintaining and managing construction infrastructure.

[0003] Against this background, the government has promulgated a ministerial ordinance amending part of the Road Act Enforcement Regulations, formulating periodic inspection guidelines that indicate specific construction infrastructure inspection methods, areas to look out for in major abnormalities, and photographs of assessment examples.For example, with regard to bridges, the guidelines target bridges with a length of 2.0 m or more, which is said to number around 700,000, and require an initial inspection within two years of opening to service, followed by periodic inspections once every five years thereafter.

[0004] Bridge inspections require a lot of time and manpower, which results in considerable costs. Therefore, attempts are being made to detect bridge abnormalities, monitor the condition, and evaluate the soundness of bridges based on acceleration and displacement obtained through bridge vibration measurements. Bridge vibration measurements do not require as many manpower as conventional inspections, which means the cost of bridge diagnosis can be reduced. Non-Patent Document 1, in particular, discloses research that uses an acceleration sensor built into a smartphone to measure the acceleration associated with bridge vibration and evaluate the soundness of the bridge based on changes in the natural vibration characteristics. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] Takumi Kobayashi, Michio Osumi: "Basic Study on the Applicability of Acceleration Sensors Built into Smartphones to Bridge Vibration Measurement (Infrastructure Maintenance Practice Research Paper Vol. 2 No. 1)" Summary of the Invention [Problem to be solved by the invention]

[0006] Non-Patent Document 1 experimentally demonstrated that the inherent vibration characteristics of a bridge can be adequately grasped using an acceleration sensor built into a smartphone. However, it is not realistic to install a smartphone, which requires charging, on a bridge on a regular basis. For example, a smartphone-based measurement would be suitable for use in an operation in which people passing over a bridge take measurements with their smartphones for a set period of time, and the soundness of the bridge can be evaluated by obtaining numerous measurement results from many passersby.

[0007] However, while it is desirable to measure at a specific location on the bridge (for example, the center of the span), non-expert passersby are unable to accurately determine where to place their smartphone. Furthermore, changes in the bridge can only be ascertained by repeatedly measuring at the same location, but it is unknown where the previous measurer placed their smartphone, so measurements will be taken in a different location each time. Furthermore, simply placing a smartphone on the bridge will not result in accurate measurements, and it is also possible that the measurement conditions will differ for each measurement.

[0008] The object of the present invention is to solve the problems of the conventional technology, that is, to provide a bridge health assessment system that can grasp the location where a smartphone is installed and can measure acceleration using a firmly fixed smartphone. [Means for solving the problem]

[0009] The present invention was made based on an unprecedented idea, focusing on the fact that acceleration can be measured in a stable state by installing a base (hereinafter referred to as the "installation base") for placing a smartphone on a bridge and storing the smartphone in a "storage space" provided in the installation base.

[0010] The bridge soundness assessment system of the present invention is a system for assessing the soundness of a bridge, and includes a smartphone with a built-in acceleration sensor, an installation stand, and measurement data analysis means. The installation stand is fixed to a pre-planned position on the bridge and has a storage space for the smartphone, and the measurement data analysis means analyzes measurement data acquired by the acceleration sensor of the smartphone placed in the storage space. The storage space is recessed from the top surface of the installation stand and is large enough to accommodate a smartphone placed flat. The bridge soundness can then be assessed based on the results of analysis by the measurement data analysis means.

[0011] The bridge soundness assessment system of the present invention may further include a clamp that moves substantially horizontally (including horizontally). In this case, when the clamp moves so as to press the smartphone that is in contact with the inner wall of the storage space, the smartphone is clamped between the inner wall and the clamp.

[0012] The bridge soundness assessment system of the present invention can also be configured so that the clamping body has a movable plate and a rotating shaft. The movable plate has a long hole formed therein, and a rack is provided in the long hole. The rotating shaft rotates around a substantially vertical axis (including vertical), and a pinion is provided on its outer periphery, with the rack and pinion meshing within the long hole. When the rotating shaft rotates, the rack and pinion move the movable plate substantially horizontally (including horizontally).

[0013] The bridge soundness assessment system of the present invention can further include a partition plate, a smartphone detection means, and a measurement status output means. The smartphone detection means is a means for detecting a smartphone placed in the accommodation space, and the measurement status output means is a means for outputting information indicating that measurement by the smartphone is in progress when the smartphone detection means detects a smartphone. The two partition plates are arranged so that they sandwich the installation base and are aligned in the bridge axis direction of the bridge.

[0014] The bridge soundness evaluation system of the present invention may further include a measurement data storage means, a measurement point assignment means, and a measurement point storage means. The measurement data storage means is a means for storing measurement data transmitted from a smartphone. The measurement point assignment means is a means for, upon receiving measurement data, assigning measurement points to the user of the smartphone associated with the measurement data. The measurement point storage means is a means for storing "user information" that identifies the user and the "measurement points" assigned by the measurement point assignment means in association with each other.

[0015] The bridge soundness assessment system of the present invention may further include a bridge information transmission means. This bridge information transmission means is a means for transmitting bridge information relating to two or more bridges to a smartphone. In this case, an installation base is fixed to each of two or more bridges, i.e., two or more bridges are targeted for measurement. The bridge information relating to each bridge also includes the measurement priority of that bridge. The measurement point assignment means assigns different measurement points according to the measurement priority, such as assigning larger measurement points to bridges with higher measurement priorities. [Effects of the Invention]

[0016] The bridge soundness evaluation system of the present invention has the following effects. (1) Compared to conventional bridge inspections, this method does not require as many manpower, which reduces the cost of assessing the health of bridges. (2) Furthermore, since a smartphone is used, there is no need to procure a dedicated accelerometer, which further reduces costs. (3) By installing smartphones that many passersby take turns using, there is no need to secure power sources or deal with malfunctions. (4) Even if the measurement point is in an environment with poor communication, the measurement data can be transmitted after moving to an environment with good communication, so there is no need to install special communication equipment. (5) Through the measurement, many citizens will become aware of the maintenance and management of construction infrastructure, and as a result, their understanding of the importance of construction infrastructure will also deepen. [Brief explanation of the drawings]

[0017] [Figure 1] 1 is a model diagram showing an outline of a bridge soundness evaluation system according to the present invention; [Figure 2] 1 is a block diagram showing the main configuration of a bridge soundness evaluation system according to the present invention; [Figure 3] (a) is a model diagram showing a smartphone equipped with an operating application and a notebook-type personal computer on the administrator side that receives the measurement data, and (b) is a graph showing the measurement data acquired by the smartphone's acceleration sensor and the results of analysis of the measurement data by the measurement data analysis means. [Figure 4] FIG. 10 is a perspective view showing a schematic view of an installation base attached to a bridge. [Figure 5] A cross-sectional view taken along a vertical plane at the position where the installation base is fixed. [Figure 6] 1A is a plan view of the installation table provided with the storage space as seen from above, and FIG. 1B is a cross-sectional view of the installation table provided with the storage space as seen from the arrow AA. [Figure 7] (a) is a partial cross-sectional view showing the storage space of the installation stand, (b) is a partial plan view showing the storage space of the installation stand, and (c) is a partial plan view showing a smartphone clamped by a clamping body. [Figure 8](a) is a cross-sectional view showing the rotation of the rotary shaft, and (b) is a plan view showing the rack and pinion mechanism consisting of a moving plate and a rotary shaft. [Figure 9] A model diagram showing a smartphone displaying bridge information as a map along with the bridge's location. [Figure 10] 1 is a flowchart showing the main processing flow of the bridge soundness evaluation system of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] An example of the implementation of the bridge soundness evaluation system of the present invention will be described with reference to the drawings. The bridge soundness evaluation system of the present invention can be used particularly effectively by bridge managers (hereinafter simply referred to as "managers"), such as the national government, local governments, or companies commissioned by the national government, when evaluating the soundness of the bridges in question.

[0019] FIG. 1 is a model diagram showing an overview of the bridge health assessment system of the present invention. As shown in this diagram, one of the technical features of the bridge health assessment system of the present invention is that a smartphone 210 is installed on a bridge, and data such as acceleration time-series data measured by an acceleration sensor built into the smartphone 210 (hereinafter referred to as "measurement data") is transmitted to an administrator. Of course, the administrator may target one bridge, i.e., the bridge on which the smartphone 210 can be installed, or two or more bridges (Bridges A and B in FIG. 1). Furthermore, the administrator may install smartphones 210 at two or more locations on a single bridge for measurement. Furthermore, in addition to transmitting data from the smartphone 210 installed on the bridge to the administrator, information about the bridge (hereinafter referred to as "bridge information") may also be distributed from the administrator. In this case, the bridge information can be distributed not only to "measurers (Users 1 and 6 in FIG. 1)" who have already installed smartphones 210 on the bridge, but also to potential measurers (Users 2 to 5 in FIG. 1) who will be measuring in the future.

[0020] 2 is a block diagram showing the main components of the bridge soundness evaluation system 100 of the present invention. As shown in this figure, the bridge soundness evaluation system 100 of the present invention is configured to include a smartphone 210, an installation stand 220, and a measurement data analysis means 310, and can also be configured to include a partition board 230, a smartphone detection means 240, a measurement status output means 250, a measurement point assignment means 320, a bridge information transmission means 330, a measurement data storage means 340, a measurement point storage means 350, and a transmission / reception means on the administrator's side.

[0021] As shown in this diagram, smartphone 210, installation stand 220, partition board 230, smartphone detection means 240, measurement status output means 250, etc. are arranged on the bridge side, which is the measurement target, while measurement data analysis means 310, measurement point assignment means 320, bridge information transmission means 330, measurement data storage means 340, measurement point storage means 350, etc. are arranged on the administrator side. Smartphone 210 and the administrator side (particularly the transmission and reception means on the administrator side) are connected so that they can communicate with each other.

[0022] Of the main elements constituting the bridge soundness evaluation system 100, the measurement data analysis means 310 and the measurement point assignment means 320 can be manufactured as dedicated units, or general-purpose computer devices can be used. In other words, the computer device executes arithmetic processing according to a predetermined program, thereby performing processing specific to each means. This computer device is equipped with a processor such as a CPU, memory such as ROM and RAM, input means such as a mouse and keyboard, and a display, and executes arithmetic processing according to a predetermined program. It can be configured as a personal computer (PC), a server, a tablet PC such as an iPad (registered trademark), a mobile device including a smartphone, or the like.

[0023] The measurement data storage means 340 and the measurement point storage means 350 can be implemented in a storage device such as a personal computer, or can be implemented in a database server. When implemented in a database server, they can be placed on a local network (LAN: Local Area Network), or can be implemented as a cloud server that stores data via the Internet.

[0024] Below, each of the main elements constituting the bridge soundness evaluation system 100 of the present invention will be described in detail.

[0025] (Smartphone) The smartphone 210 that constitutes the bridge soundness assessment system 100 has a built-in acceleration sensor and is capable of transmitting and receiving various data including measurement data. The smartphone 210 is a plate-like device with a small thickness compared to the display surface, and various models available on the market can be used.

[0026] The acceleration sensor built into the smartphone 210 can acquire measurement data, including acceleration time-series data. The measurement data acquired by the acceleration sensor is sent to the administrator side using the smartphone 210's transmission / reception function. To perform measurements using the acceleration sensor and send the measurement data, it is recommended that the smartphone 210 be equipped with an operating application. For example, the display screen of the smartphone 210 shown in FIG. 3(a) displays icons for instructing "Start Measurement," "End Measurement," and "Send." When the user taps the "Start Measurement Icon," the acceleration sensor starts measurement. When the user taps the "End Measurement Icon," the acceleration sensor ends measurement. When the user taps the "Send Icon," the measurement data is sent to the administrator side. If the measurement location is in an environment with poor communication, it is recommended that the measurement data be sent after moving to an environment with good communication.

[0027] (Installation stand) The installation stand 220 is a support stand for stably positioning the smartphone 210, and is detachably fixed to a part of the bridge. Fig. 4 is a perspective view showing the installation stand 220 attached to the bridge, and Fig. 5 is a cross-sectional view taken along a vertical plane at the position where the installation stand 220 is fixed. As shown in these figures, the installation stand 220 can be fixed to, for example, the sidewalk of the bridge. In this case, however, it is preferable to fix the installation stand 220 in a position that does not obstruct ordinary pedestrians.

[0028] The installation stand 220 is a transportable box-like structure that can be made of various materials such as concrete or steel. If it is made of concrete, it is recommended to use lightweight concrete or fiber-reinforced concrete to facilitate transportation, i.e., to reduce weight.

[0029] To detachably fix the installation base 220 to the bridge, it is advisable to use anchors AC as shown in Fig. 5. Specifically, a mechanical joint is attached to the installation base 220 in advance, and anchors AC are buried in the bridge deck, and the installation base 220 is fixed using the mechanical joints and anchors AC. Alternatively, angle irons with bolt holes can be attached to the installation base 220 in advance, and anchors AC with screw holes can be buried in the bridge deck, and bolts can be fixed using the bolt holes in the angle irons and the screw holes in the anchors AC. Note that when adjusting unevenness before installing the installation base 220, it is advisable to use, for example, bedding mortar.

[0030] The location where the installation base 220 is placed, i.e., the location on the bridge where measurement will be performed, is determined in advance by a person with specialized knowledge. At this time, it is advisable to determine the optimal location after measuring acceleration using both a dedicated device for measuring acceleration and the smartphone 210. For example, it is necessary to understand the extent to which the acceleration time-series data of interest differs between the dedicated device and the smartphone 210, and to search for a location where measurement can be performed with high accuracy using the smartphone 210. Note that the influence of noise may change depending on factors such as the distance from the bridge joint, so it is desirable to determine the location of the installation base 220 after taking these factors into consideration.

[0031] To acquire measurement data, the measurer places the smartphone 210 on the installation stand 220 and waits there for a predetermined measurement period (e.g., several minutes to several tens of minutes). It is desirable to separate the space where this work is performed (hereinafter simply referred to as the "measurement space") from general traffic space. For example, in FIG. 4, an explicit measurement space is formed by installing two partitions 230 aligned along the bridge axis. That is, the partitions 230 are installed on the bridge (e.g., on the sidewalk) so that the installation stand 220 is sandwiched between them and a space where the measurer can stay is provided, thereby forming the measurement space. In this case, fixing the installation stand 220 close to the protective fence, as shown in FIG. 4, is preferable because it ensures general traffic space and clearly separates it from the measurer's traffic flow. The partitions 230 are installed on the bridge in a detachable manner, just like the installation stand 220.

[0032] While the measurer is in the measurement space, it is desirable to display a sign indicating that measurement is in progress so as not to arouse suspicion among passersby. For example, a sign saying "Measurement in Progress" can be hung on the partition board 230 to indicate that measurement is in progress.

[0033] Alternatively, a sensor capable of detecting the smartphone 210 (hereinafter referred to as the "smartphone detection means 240") and a means for outputting a signal detected by the smartphone detection means 240 (hereinafter referred to as the "measurement status output means 250") can be used to indicate that measurement is in progress. Specifically, when the smartphone detection means 240 arranged in the measurement space detects that the smartphone 210 has been placed in a predetermined position (the "accommodation space 260" described below) on the installation stand 220, the measurement status output means 250 receives the detection signal and outputs predetermined information. As the smartphone detection means 240, various conventionally known sensors can be used, such as those that detect the smartphone 210 by image, by its weight, or by infrared rays like a human presence sensor. Furthermore, as the measurement status output means 250, a display that displays characters and symbols, a speaker that outputs sound, a light that outputs light (e.g., a red rotating light), etc. can be used.

[0034] (Containment space) The installation stand 220 is formed with a "storage space 260" that clearly indicates the placement location of the smartphone 210 and allows the smartphone 210 to be stably placed therein. Fig. 6 is a diagram showing the installation stand 220 provided with the storage space 260, where (a) is a plan view seen from above and (b) is a cross-sectional view taken along the line AA in Fig. 6(a). As shown in this figure, the storage space 260 is formed approximately near the center of the top surface of the installation stand 220.

[0035] Because the accommodation space 260 is provided in this way, even a measurer visiting the measurement space for the first time can clearly understand where to place the smartphone 210, and because the installation stand 220 is stably fixed, the smartphone 210 can also be stably placed. However, since the smartphone 210 remains placed in the accommodation space 260 for the measurement period (for example, several minutes to several tens of minutes), it is necessary to protect the smartphone 210 with an umbrella or the like in rainy weather. Therefore, it is advisable to attach a "roof body 280" that covers the accommodation space 260 to the installation stand 220.

[0036] As shown in FIG. 6, the roof body 280 is composed of a ceiling slab 281 and a side slab 282, and the side slabs 282 are fixed to the sides of the installation base 220, while the ceiling slab 281 is fixed to the upper end of the side slab 282. By attaching the roof body 280 in this manner, the smartphone 210 can be protected from rain falling from above or the sides. Note that in FIG. 6, side slabs 282 are installed on three sides to allow the smartphone 210 to be taken in and out, with one side being an opening, but it is also possible to install side slabs 282 on all four sides, making one side openable and closable. Also, in FIG. 6, an opening is provided in the bridge axis direction, but an opening can also be provided in the direction perpendicular to the bridge axis (particularly on the roadway side).

[0037] FIG. 7 is a diagram showing the installation stand 220, particularly the storage space 260, where (a) is a partial cross-sectional view, (b) is a partial plan view seen from above, and (c) is a partial plan view showing the smartphone 210 held by the holding body 270 (described later). The storage space 260 is formed as a recess recessed from the upper surface of the installation stand 220 as shown in FIG. 7(a), and is formed to a size capable of holding the smartphone 210 in a "flat-laid" state as shown in FIG. 7(b). The height difference (i.e., the step) between the upper surface of the installation stand 220 and the bottom surface of the storage space 260 should be approximately the same as the thickness of an average smartphone 210, and the planar dimensions and planar shape of the storage space 260 should be designed based on the average smartphone 210. Note that "flat-laid" here refers to a state in which the smartphone 210 is placed in a substantially horizontal (including horizontal) position with its display screen facing up (or down).

[0038] A "holding member 270" for more firmly fixing the smartphone 210 can also be provided on the upper surface of the installation base 220. This holding member 270 can be composed of a moving plate 271 and a rotating shaft 272, as shown in FIG. 7. The rotating shaft 272 is embedded in the installation base 220 so that a portion of it protrudes from the upper surface of the installation base 220. One of the moving plates, the moving plate 271, has an elongated hole 271H formed therein, and the moving plate 271 is attached to the rotating shaft 272 by inserting the rotating shaft 272 into this elongated hole 271H. Note that although the moving plate 271 is attached so as not to come off the rotating shaft 272, the moving plate 271 is not fixed to the rotating shaft 272, and therefore can slide along the elongated hole 271H.

[0039] Here, a procedure for firmly fixing the smartphone 210 using the clamping body 270 will be described. First, as shown in FIG. 7(b), the smartphone 210 is placed so as to abut against a portion of the inner wall of the storage space 260 (the upper surface and left surface in the figure). Next, the movable plate 271 is slid to press the smartphone 210. As a result, as shown in FIG. 7(c), the smartphone 210 is clamped between the inner wall of the storage space 260 and the clamping body 270 (particularly the movable plate 271), i.e., the smartphone 210 is firmly fixed. Note that, to prevent damage to the smartphone 210 of the measurer, it is advisable to install a cushioning material CM made of, for example, synthetic rubber on a portion of the inner wall of the storage space 260 and the tip of the movable plate 271. Furthermore, in the example of FIG. 7, two clamping bodies 270 are provided to clamp the smartphone 210 from two directions. However, the clamping bodies 270 may be provided to clamp the smartphone 210 from one or three directions.

[0040] To slide the movable plate 271, a so-called "rack and pinion mechanism" can be used, as shown in FIG. 8. FIG. 8(a) is a cross-sectional view (a cross-sectional view taken along the arrow BB in FIG. 6(a)) that schematically shows the state in which the rotating shaft 272 rotates, and FIG. 8(b) is a plan view that schematically shows the rack and pinion mechanism made up of the movable plate 271 and the rotating shaft 272. In this case, the rotating shaft 272 is configured to be rotatable around a substantially vertical axis (including the vertical) as shown in FIG. 8(a). Also, as shown in FIG. 8(b), a pinion 272P is provided on the outer periphery of the rotating shaft 272, and a rack 271R is provided in the elongated hole 271H of the movable plate 271. The rotating shaft 272 is arranged so that the pinion 272P and the rack 271R mesh with each other within the elongated hole 271H. As a result, when the rotary shaft 272 rotates around a substantially vertical axis, the pinion 272P also rotates accordingly, and the rack 271R meshed with the pinion 272P moves relative to the rotary shaft 272, causing the moving plate 271 to slide.

[0041] (Method of analyzing measurement data) The measurement data analysis means 310 is a means for analyzing measurement data acquired by the acceleration sensor of the smartphone 210 placed in the accommodation space 260. This measurement data analysis means 310 is installed on a computer on the administrator's side that is located away from the bridge where the measurement is being performed. Therefore, the administrator receives the measurement data transmitted from the smartphone 210, and the measurement data analysis means 310 performs analysis using the received measurement data. For example, in FIG. 3(b), a frequency response analysis is performed using the received acceleration time-series data (measurement data) to determine the natural vibration characteristics of the bridge (particularly the deck). Note that in the example of FIG. 3(a), the measurement data is received and analyzed by a notebook personal computer on the administrator's side, but it can also be received and analyzed by a desktop personal computer or smartphone.

[0042] The measurement data analysis means 310 can be configured to perform analysis every time it receives measurement data from the smartphone 210, or to perform analysis when measurement data has been accumulated for a predetermined measurement period. The measurement data transmitted from the smartphone 210 is stored in the measurement data storage means 340 (FIG. 2), and the results of analysis by the measurement data analysis means 310 can also be stored in the measurement data storage means 340.

[0043] (Means for assigning measurement points) The measurement point assigning means 320 is a means for assigning "measurement points" to the user of the smartphone 210 that sent the measurement data when the transmitting / receiving means on the administrator side receives the measurement data. The measurement points are then associated with "user information" registered in advance and stored in the measurement point storage means 350 (FIG. 2). Here, "user information" refers to information that can identify the user, such as a user identifier (ID), for example.

[0044] As mentioned above, the administrator's transmitting / receiving means can not only receive measurement data from the smartphone 210, but also distribute "bridge information" to multiple users' smartphones 210. This bridge information can include the importance of the bridge set based on traffic volume and road class, the number and measurement time of measurements taken on the bridge, and the "measurement priority" for measurements. This measurement priority can be set based on the importance, number of measurements, and measurement time of the bridge; for example, the higher the importance and the fewer the number of measurements and measurement time, the higher the measurement priority can be set.

[0045] It is advisable to display the bridge information distributed by the administrator on a map along with the bridge location, as shown in Figure 9. In Figure 9, the measurement priority (high, medium, low) for bridge information is displayed along with a road map, which shows that Bridge A has a high measurement priority, Bridge B has a medium measurement priority, and Bridge C has a low measurement priority. By displaying bridge information on a map along with the bridges in this way, the user can grasp which bridges are close to their current location, as well as the measurement priority of those bridges.

[0046] If a smartphone detection means 240 is installed in a measurement space, the administrator can also broadcast the measurement status in that measurement space to the user. That is, the administrator receives the signal detected by the smartphone detection means 240 and broadcasts to the user that measurement is in progress based on that detection information. This prevents different measurers from visiting the same measurement space at the same time. In this case, it is also desirable to display the map; for example, in Figure 9, bridge B is displayed as "measuring." As mentioned above, it is possible to fix the installation stand 220 in two or more locations on one bridge, so in that case it is better to display "measuring" for each installation stand 220 (measurement space) rather than for each bridge.

[0047] The measurement point assigning means 320 can assign measurement points after setting their size. For example, measurement points can be set according to measurement priority, and the higher the measurement priority, the larger the measurement points can be set and assigned to the user. Alternatively, in addition to (or instead of) measurement priority, the longer the measurement time per measurement, the larger the measurement points can be set and assigned to the user.

[0048] (Processing flow) The main processing of the bridge soundness evaluation system 100 of the present invention will be described in detail below with reference to Fig. 10. Fig. 10 is a flow diagram showing an example of the flow of the main processing of the bridge soundness evaluation system 100, in which the processing to be executed is shown in the center column, the information required for that processing is shown in the left column, and the information resulting from that processing is shown in the right column.

[0049] First, as a preliminary step, an expert or the like determines the location for placing the installation stand 220, and then the installation stand 220 is fixed in that location. At this time, it is preferable to perform measurements using both a dedicated device for measuring acceleration and the smartphone 210 and then determine the optimal location. A partition board 230 is installed to form a measurement space, and the smartphone detection unit 240 and the measurement status output unit 250 are also installed as needed. Then, bridge information such as measurement priority and measurement status is distributed from the administrator to the smartphones 210 of multiple users (Step 401 in FIG. 10 ), and the bridge information is displayed on the smartphone 210 along with the bridge as a map (Step 402 in FIG. 10 ). Meanwhile, the user, referring to the bridge information displayed on the map, heads toward the target bridge and places their smartphone 210 in the accommodation space 260 of the installation stand 220 (Step 403 in FIG. 10 ). At this time, it is preferable to firmly fix the smartphone 210 by operating the clamping body 270.

[0050] When the smartphone 210 is placed in the accommodation space 260, the smartphone detection means 240 transmits the detection information to the measurement status output means 250 (Step 404 in FIG. 10), and the measurement status output means 250 outputs that measurement is in progress (Step 405 in FIG. 10). The user then performs measurement by operating an application installed on the smartphone 210 (Step 406 in FIG. 10), and after the measurement is completed, the measurement data is transmitted to the administrator (Step 407 in FIG. 10). At this time, if the measurement point is in an environment with poor communication, it is recommended to transmit the measurement data after moving to an environment with good communication.

[0051] When the administrator receives the measurement data (Step 408 in FIG. 10), the measurement point assigning means 320 assigns measurement points to the user (Step 409 in FIG. 10). At this time, as mentioned above, the size of the measurement points can be set according to the measurement priority before assigning them. Then, the measurement data analysis means 310 performs an analysis using the measurement data acquired by the acceleration sensor, and the soundness of the bridge can be evaluated based on the results (Step 410 in FIG. 10). [Industrial Applicability]

[0052] The bridge soundness assessment system of the present invention can be used for various bridges, including steel bridges, concrete bridges, etc. Considering that it is possible to grasp the soundness of bridges, which are construction infrastructure, in a timely manner and, as a result, to prevent accidents caused by bridge damage, the present invention can be said to be an invention that is not only applicable industrially but is also expected to make a great contribution to society. [Explanation of symbols]

[0053] 100 Bridge soundness evaluation system of the present invention 210 (Bridge Soundness Assessment System) Smartphone 220 (Bridge Health Assessment System) Installation Base 230 (Bridge Integrity Assessment System) Divider 240 Smartphone Detection Method (for Bridge Health Assessment System) 250 (Bridge Soundness Assessment System) Measurement Status Output Means 260 (Bridge Health Assessment System) Accommodating Space 270 (Bridge Integrity Assessment System) Clamp 271 (Clipping body) moving plate 271H (clamp) slot 271R (long hole) rack 272 (Clipping body) rotation axis 272P (rotating shaft) pinion 280 (Installation base) roof body 281 (roof) ceiling slab 282 (Roof) Side Plate 310 (Bridge Health Assessment System) Measurement Data Analysis Method 320 (Bridge Health Assessment System) Measurement Point Assignment Method 330 (Bridge Health Assessment System) Bridge Information Transmission Means 340 (Bridge Soundness Assessment System) Measurement Data Storage Means 350 (Bridge Soundness Assessment System) Measurement Point Storage Means AC Anchor CM buffer material

Claims

1. A system for evaluating the soundness of a bridge, A smartphone with a built-in acceleration sensor An installation stand that is fixed to a pre-planned position on the bridge and has an accommodation space for accommodating the smartphone; a measurement data analysis means for analyzing measurement data acquired by the acceleration sensor of the smartphone placed in the accommodation space, The storage space is a recessed space recessed from an upper surface of the installation stand, and is formed to a size that can store the smartphone placed flat, The soundness of the bridge can be evaluated based on the results of analysis by the measurement data analysis means. A bridge soundness evaluation system characterized by:

2. Further provided with a clamping body that moves horizontally or approximately horizontally, When the clamping body moves so as to press the smartphone abutting against the inner wall of the storage space, the smartphone is clamped between the inner wall and the clamping body.

2. The bridge soundness evaluation system according to claim 1.

3. the clamping body has a moving plate having a long hole formed therein and a rotating shaft that rotates around a vertical or approximately vertical axis, A rack is provided in the long hole of the moving plate, The rotating shaft is provided with a pinion on its outer periphery, and is disposed in the elongated hole so that the rack and the pinion mesh with each other, When the rotation shaft rotates, the moving plate moves horizontally or approximately horizontally by the rack and the pinion.

3. The bridge soundness evaluation system according to claim 2.

4. Two partition plates arranged so as to sandwich the installation base therebetween and to be aligned in the bridge axis direction of the bridge; A smartphone detection means for detecting the smartphone placed in the storage space; Further provided is a measurement status output means for outputting information indicating that measurement by the smartphone is in progress when the smartphone detection means detects the smartphone.

2. The bridge soundness evaluation system according to claim 1.

5. a measurement data storage means for storing the measurement data transmitted from the smartphone; a measurement point assigning means for assigning measurement points to a user of the smartphone related to the measurement data upon receiving the measurement data; a measurement point storage means for storing user information for identifying the user and the measurement points assigned by the measurement point assigning means in association with each other, 2. The bridge soundness evaluation system according to claim 1.

6. Further provided is a bridge information transmission means for transmitting bridge information relating to two or more of the bridges to the smartphone, The installation base is fixed to each of the two or more bridges, the bridge information relating to the bridge includes a measurement priority relating to the bridge; the measurement point assigning means assigns different measurement points depending on the measurement priority.

6. The bridge soundness evaluation system according to claim 5.

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