Three-dimensional girder displacement sensor module for bridges, three-dimensional girder displacement detection system for bridges, and three-dimensional girder displacement detection method for bridges

Abstract

To quickly know the propriety of the passage on a bridge.SOLUTION: A three-dimensional girder displacement detection system 100 for bridges includes a three-dimensional girder displacement sensor module 101 for bridges and a server device 102. A three-dimensional girder displacement sensor module 101 for bridges measures the displacement of a bridge girder provided in association with a plurality of antennas 104_A and 104_B for receiving radio waves for position detection, based on output signals from the plurality of antennas 104_A and 104_B, and wirelessly transmits measurement information including the measured result by radio. The server device 102 determines the possibility of passage of the bridge BR based on the measurement information, and outputs the result of the determination.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a three-dimensional girder displacement sensor module for bridges, a three-dimensional girder displacement detection system for bridges, and a three-dimensional girder displacement detection method for bridges. [Background technology]

[0002] For example, Patent Document 1 discloses a technology for identifying the amount of displacement of a bridge superstructure. The technology described in Patent Document 1 calculates the amount of displacement of a bridge when a vehicle passes over it in order to estimate the degree of deterioration of the bridge.

[0003] Here, the superstructure refers to a structure supported by multiple substructures (including piers, supports, etc.) aligned in the bridge axis direction, and includes the main girders, deck slabs, etc. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2018-204952 A Summary of the Invention [Problem to be solved by the invention]

[0005] Generally, when a relatively large earthquake occurs, the bridge girders may be displaced in various directions, causing gaps, steps, etc. in the passageway formed by the bridge. When such a situation occurs, an emergency situation often occurs in the area surrounding the bridge, so even if there are gaps, steps, etc. in the passageway formed by the bridge, emergency vehicles may pass over the bridge depending on the condition of the passageway.

[0006] In addition, if the passageway is impassable due to large gaps or steps, emergency vehicles may have to turn back along the bridge passageway and take a detour route that does not go through the bridge. In such cases, arrival at the scene is delayed due to the time it takes to travel to and from the bridge.

[0007] In order for emergency vehicles to arrive quickly at the scene of an emergency, it is desirable to know as soon as possible whether a bridge is passable after an earthquake or other event occurs.

[0008] However, as mentioned above, the technology described in Patent Document 1 aims to estimate the degree of deterioration of a bridge, and calculates the amount of displacement of the bridge when a vehicle passes over it. When an earthquake or other event occurs, general vehicles often refrain from normal driving by slowing down or stopping, so it is difficult to apply this technology to obtaining the amount of displacement of a bridge to know whether it is passable or not.

[0009] The present invention aims to solve this problem and to provide a three-dimensional girder displacement sensor module for bridges, a three-dimensional girder displacement detection system for bridges, and a three-dimensional girder displacement detection method for bridges, which can quickly determine whether or not a bridge is passable. [Means for solving the problem]

[0010] In order to achieve the above object, a three-dimensional girder displacement sensor module for bridges according to a first aspect of the present invention comprises: Receive radio waves for location detection 1. antenna , a second antenna and a third antenna; The first antenna, the second antenna, and the third antenna Based on the output signal from The first antenna, the second antenna and the third antenna The bridge girder to which the antennas are attached And adjacent bridge girders A measurement unit for measuring the displacement of the a sensor communication unit that wirelessly transmits measurement information including the results of measurement by the measurement unit; 、 The first antenna is provided near one of both ends in the extension direction of the bridge girder, The second antenna is provided in the vicinity of an end portion close to the one end portion of the two end portions of the adjacent bridge girders in the extension direction, the third antenna is provided near the other of the two ends, The measurement unit includes: measuring a change in relative position between adjacent ends of the bridge girder and the adjacent bridge girder as the displacement based on a difference between the output signals from the first antenna and the second antenna; Based on a difference between the output signals from the first antenna and the third antenna, a change in an angle of the extension direction of the bridge girder with respect to a predetermined bridge axis direction is measured as the displacement. do.

[0011] A three-dimensional girder displacement detection system for bridges according to a second aspect of the present invention comprises: The above-mentioned three-dimensional girder displacement sensor module for bridges; A passage determination device is provided, The passage determination device determines the passability of a bridge BR based on measurement information transmitted from a sensor communication unit, and outputs the result of the determination.

[0012] A three-dimensional girder displacement detection method for bridges according to a third aspect of the present invention comprises: a three-dimensional girder displacement sensor module for bridges, the three-dimensional girder displacement sensor module including: an antenna for receiving radio waves for position detection, the first antenna being provided near one of both ends in the extension direction of the bridge girder; a second antenna being provided near an end close to the one end of both ends in the extension direction of a bridge girder adjacent to the bridge girder; and a third antenna being provided near the other end of the both ends; The first antenna, the second antenna, and the third antenna Based on the output signal from the antenna, The first antenna, the second antenna, and the third antenna The antennas are provided in correspondence with each other. The above Bridge girder and the adjacent bridge girder Measuring the displacement of and wirelessly transmitting measurement information including the measured results. fruit, Measuring the displacement comprises: Measuring a change in relative position between adjacent ends of the bridge girder and the adjacent bridge girder as the displacement based on a difference between output signals from the first antenna and the second antenna; and measuring, as the displacement, a change in an angle of an extension direction of the bridge girder with respect to a predetermined bridge axis direction based on a difference between output signals from the first antenna and the third antenna. . Effect of the Invention

[0013] According to the present invention, it is possible to quickly know whether a bridge is passable or not. [Brief description of the drawings]

[0014] [Figure 1] 1 is a diagram showing a configuration of a three-dimensional girder displacement detection system for a bridge according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a diagram showing a physical configuration of the sensor module according to the first embodiment. [Diagram 3] FIG. 2 is a diagram showing a physical configuration of a server device according to the first embodiment. [Figure 4] FIG. 2 is a diagram illustrating a functional configuration of the sensor module according to the first embodiment. [Diagram 5] FIG. 2 is a diagram illustrating a functional configuration of a server device according to the first embodiment. [Figure 6]FIG. 2 is a diagram illustrating a functional configuration of a terminal device according to the first embodiment. [Figure 7] FIG. 2 is a diagram showing an example of a process flow in the three-dimensional girder displacement detection method for a bridge according to the first embodiment of the present invention. [Figure 8] FIG. 13 is a diagram showing an example of gaps that occur at the joints of bridge girders. [Figure 9] FIG. 13 is a diagram showing an example of lateral displacement occurring at a bridge girder joint. [Figure 10] FIG. 13 is a diagram showing an example of a step occurring at a joint of a bridge girder. [Figure 11] FIG. 11 is a diagram showing an example of a process flow in a three-dimensional girder displacement detection method for a bridge according to Modification 1. [Figure 12] FIG. 11 is a diagram showing a configuration of a three-dimensional girder displacement detection system for bridges according to a second embodiment of the present invention. [Figure 13] FIG. 11 is a diagram illustrating a functional configuration of a sensor module according to a second embodiment. [Figure 14] FIG. 11 is a diagram illustrating a functional configuration of a server device according to the second embodiment. [Figure 15] FIG. 11 is a diagram showing an example of a process flow in a three-dimensional girder displacement detection method for a bridge according to the second embodiment of the present invention. [Figure 16] FIG. 1 is a diagram showing an example of rotation occurring in a bridge girder. [Figure 17] FIG. 11 is a diagram showing a configuration of a three-dimensional girder displacement detection system for bridges according to a third embodiment of the present invention. [Figure 18] FIG. 11 is a diagram illustrating a functional configuration of a sensor module according to a third embodiment. [Figure 19] FIG. 11 is a diagram illustrating a functional configuration of a server device according to the third embodiment. [Figure 20] FIG. 11 is a diagram showing an example of a process flow in a three-dimensional girder displacement detection method for a bridge according to embodiment 3 of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The same elements are designated by the same reference numerals throughout the drawings.

[0016] <<Embodiment 1>> A three-dimensional girder displacement detection system for bridges 100 according to the first embodiment of the present invention is a system for detecting displacements of a plurality of bridge girders BG included in a bridge BR, as shown in FIG.

[0017] Here, the bridge BR according to this embodiment comprises a plurality of support structures D and a plurality of bridge girders BG. The plurality of support structures D are structures whose lower ends are fixed to the ground or the like and arranged in a line in the bridge axis direction, and each includes, for example, piers and bearings. The plurality of bridge girders BG are supported by the support structures D by being bridged between adjacent support structures D. The upper surfaces of the plurality of bridge girders BG become the road surface S of, for example, an expressway, a general road, or the like.

[0018] In such a bridge BR, adjacent bridge girders BG are arranged in the bridge axis direction so that they are generally in contact on a common supporting structure D. This makes the road surface S generally even with no gaps, forming a passageway for vehicles, people, etc.

[0019] The structure of the bridge BR is not limited to being composed of multiple support structures D and bridge girders BG; the bridge BR may, for example, be equipped with a deck in addition to these, or may be a suspension bridge in which multiple bridge girders BG are supported by cables or the like.

[0020] In this embodiment, as shown in Fig. 1, the predetermined bridge axis direction is the left-right direction, and the direction perpendicular to the road surface S is the up-down direction. The bridge axis direction is defined, for example, when the bridge BR is designed or constructed. The direction perpendicular to the left-right and up-down directions is defined as the front-to-rear direction, and the left and right are defined according to the direction as seen from the front (the direction toward the front of the paper in Fig. 1). These terms indicating directions are used for the purpose of explanation and are not intended to limit the present invention.

[0021] In this embodiment, the up-down direction is described as being parallel to the vertical direction, but if the road surface S is not horizontal, the up-down direction may be either a direction perpendicular to the road surface S or the vertical direction.

[0022] FIG. 1 shows a portion of a bridge BR, and the number of bridge girders BG included in the bridge BR may be any number as long as it is two or more.

[0023] As shown in Fig. 1, a three-dimensional girder displacement detection system for bridges (hereinafter also simply referred to as a "displacement detection system") 100 includes a plurality of three-dimensional girder displacement sensor modules for bridges (hereinafter also simply referred to as "sensor modules") 101, a server device 102, and a terminal device 103. Note that, for ease of understanding, in Fig. 1, the sensor module 101 is shown larger than it actually is compared to the bridge girder BG, but it goes without saying that the size of each component may be changed as appropriate.

[0024] Each of the multiple sensor modules 101 and the server device 102 transmit and receive information to and from each other by communicating via a network N1. The network N1 may be constructed including a wireless communication line, that is, may be constructed only by a wireless communication line or by a combination of wireless and wired communication lines.

[0025] Furthermore, the server device 102 and the terminal device 103 transmit and receive information to and from each other by communicating via a wireless communication line, a wired communication line, or a network N2 constructed by combining these communication lines.

[0026] In this embodiment, an example will be described in which the displacement detection system 100 includes a plurality of sensor modules 101. However, it is preferable that the displacement detection system 100 includes at least one sensor module 101.

[0027] (Physical configuration of the sensor module 101) Each of the sensor modules 101 physically includes two antennas 104_A and 104_B and a storage box SB connected to the antennas 104_A and 104_B by conductors W_A and W_B, respectively, as shown in Fig. 1. The storage box SB is a box-shaped member that is difficult for raindrops and the like to penetrate, and is fixed to an appropriate location such as the ground or a support member D. The storage box SB physically includes two receiving modules 105_A and 105_B, a control module 106, a communication module 107, and a power source 108 therein, as shown in Fig. 2.

[0028] Each of the antennas 104_A and 104_B receives radio waves for position detection and outputs an output signal corresponding to the received radio waves. The radio waves received by the antennas 104_A and 104_B are preferably radio waves from positioning satellites of the Global Navigation Satellite System (GNSS).

[0029] Antennas 104_A and 104_B are provided near the respective adjacent ends of adjacent bridge girders BG.

[0030] That is, the antenna 104_A is an antenna provided near one of the adjacent ends of adjacent bridge girders BG and is associated with the bridge girders BG including the one end, while the antenna 104_B is an antenna provided near the other of the adjacent ends of adjacent bridge girders BG and is associated with the bridge girders BG including the other end.

[0031] One of the antennas 104_A and 104_B according to the present embodiment corresponds to a first antenna, and the other of the antennas 104_A and 104_B according to the present embodiment corresponds to a second antenna.

[0032] Here, the vicinity means within a predetermined range from a reference position such as an end, and the same applies hereinafter. For example, in the case of antennas 104_A and 104_B, the range near the end is preferably about 0 to 1 m (meter) from the end, but is not limited to this.

[0033] In detail, each of the antennas 104_A, 104_B is appropriately housed in a case into which raindrops and the like are unlikely to penetrate, and is provided at or above the upper end of the side part (the front end part in this embodiment) of the bridge girder BG.

[0034] Typical examples of installation above the side of the bridge girder BG include installation at the upper end of a soundproof wall installed on the side of the bridge girder BG, or installation on a support member extending upward on the side of the bridge girder BG.

[0035] In this way, by providing the antennas 104_A and 104_B at the upper end or above the side of the bridge girder BG, the possibility of radio waves being blocked by an object between the positioning satellite or the like that outputs radio waves and the antennas 104_A and 104_B is reduced. Therefore, the antennas 104_A and 104_B can stably receive radio waves from the positioning satellite or the like. Therefore, it becomes possible to detect the positions of the antennas 104_A and 104_B at any desired time.

[0036] A metal plate may be disposed below each of the antennas 104_A and 104_B to facilitate reception of radio waves.

[0037] The receiving modules 105_A and 105_B are connected to the antennas 104_A and 104_B via conductors W_A and W_B, respectively, and are composed of electrical circuits (e.g., amplifiers, conversion circuits, oscillator circuits, etc.) that process electrical signals from the antennas 104_A and 104_B, and a CPU incorporating a computer program for controlling the electrical circuits.

[0038] The control module 106 includes a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), a storage unit, etc. The storage unit includes, for example, a solid state drive (SSD), a flash memory, a hard disk drive (HDD), etc.

[0039] The communication module 107 is a module for wireless communication with the server device 102, and is composed of a communication antenna, electric circuits (for example, an amplifier, a conversion circuit, an oscillation circuit, etc.), a CPU with a built-in computer program for controlling the electric circuits, and the like.

[0040] It is desirable for the wireless communication used by the communication module 107 to be capable of relatively large-capacity data communication and to have a communication network that covers a relatively wide area. From this perspective, the wireless communication used by the communication module 107 is preferably, for example, wireless communication used in mobile phones and mobile data communication such as LTE (Long Term Evolution).

[0041] The power supply 108 supplies power for operating the sensor module 101. The power supply 108 is preferably a battery. The power supply 108 may supply power obtained from a commercial power source, for example. In this case, however, there is a risk that the power supply may be cut off due to a power outage or a cut in the power line when an earthquake or the like occurs. By employing a battery as the power supply 108, it is possible to reduce the possibility that the power supply will be cut off when an earthquake or the like occurs, and it is possible to increase the possibility that the sensor module 101 can continue to operate stably. The battery employed as the power supply 108 may be either a primary battery or a secondary battery.

[0042] The control module 106 executes, for example, a software program (also simply referred to as a "program") preinstalled on a CPU included in the control module 106, using the RAM 1002 as a workspace. As a result, the control module 106 controls the receiving modules 105_A and 105_B and the communication module 107, operates together with them, and performs functions described below (see FIG. 4).

[0043] (Physical configuration of server device 102) The server device 102 is a device installed in an institution or the like that manages the data acquired by the sensor module 101, and is physically a computer such as a personal computer, a mainframe, or a supercomputer.

[0044] As shown in FIG. 3, the server device 102 is physically composed of a CPU (Central Processing Unit) 1001, a RAM (Random Access Memory) 1002, a ROM (Read Only Memory) 1003, a storage unit 1004, a communication I / F (Interface) 1005, a display unit 1006, an input unit 1007, etc., which are communicatively connected via an internal bus 1008.

[0045] The storage unit 1004 is composed of, for example, an SSD, a flash memory, a HDD, etc. The display unit 1006 is composed of, for example, a liquid crystal panel, etc. The input unit 1007 is composed of, for example, a keyboard, a mouse, a touch panel, etc.

[0046] The server device 102 performs functions described below by, for example, executing a pre-installed program by the CPU 1001 using the RAM 1002 as a workspace (see FIG. 5).

[0047] (Physical configuration of terminal device 103) The terminal device 103 is a device used by a user such as a crew member of an emergency vehicle, and is, for example, a general-purpose tablet terminal, a smartphone, etc. The terminal device 103 may be a general-purpose personal computer.

[0048] The terminal device 103 is physically configured in roughly the same way as a server device (see FIG. 3). The terminal device 103 performs the functions described below, for example, by executing a pre-installed program on the CPU using the RAM as a workspace (see FIG. 6).

[0049] (Functional configuration of sensor module 101) The sensor module 101 functionally measures the displacement of a bridge girder BG to which the multiple antennas 104_A, 104_B are associated, based on output signals from the multiple antennas 104_A, 104_B. The sensor module 101 functionally includes a measurement unit 109 and a sensor communication unit 110, as shown in FIG.

[0050] The measuring unit 109 measures the displacement of the bridge girder BG to which the antennas 104_A and 104_B are associated, based on the output signals from the antennas 104_A and 104_B.

[0051] In this embodiment, the bridge girders BG to which the antennas 104_A and 104_B are associated are adjacent bridge girders BG. As the displacement of the bridge girders BG, the change in the relative position between the adjacent ends of the adjacent bridge girders BG from a predetermined relative position is measured.

[0052] The predetermined relative position between the adjacent ends of adjacent bridge girders BG is, for example, a position that forms a substantially gap-free and even road surface S on the upper surface of the bridge girders BG.

[0053] The sensor communication unit 110 wirelessly transmits measurement information including the results of measurement by the measurement unit 109 (i.e., the measurement results). The sensor communication unit 110 according to this embodiment wirelessly transmits the measurement information to the server device 102. By using wireless communication in this manner, it is possible to reduce the possibility of communication being interrupted due to a disconnection caused by an earthquake or the like. Therefore, it becomes possible to stably transmit the measurement information to the server device 102.

[0054] (Functional configuration of server device 102) Functionally, the server device 102 is a device that manages the displacement detection system 100, and, for example, as a passage determination device, determines the passability of a bridge BR based on measurement information transmitted from the sensor communication unit 110, and outputs the result of the determination.

[0055] In detail, as shown in FIG. 5, the server device 102 functionally includes a first server communication unit 111, a measurement history storage unit 112, a determination unit 113, a second server communication unit 114, and a server display unit 115.

[0056] The first server communication unit 111 communicates with the sensor module 101. For example, the first server communication unit 111 transmits a measurement request to the sensor module 101 at a predetermined time to cause the sensor module 101 to measure the displacement of the girder BG. Also, for example, the first server communication unit 111 acquires measurement information transmitted from the sensor communication unit 110.

[0057] When the first server communication unit 111 acquires measurement information, the measurement history storage unit 112 stores therein measurement history information that associates the measurement information with measurement time information indicating the date and time of the measurement.

[0058] The determination unit 113 acquires the measurement information from the measurement history storage unit 112 or the first server communication unit 111. Then, the determination unit 113 compares the displacement included in the measurement information with a predetermined reference value to determine the passability of the bridge BR.

[0059] Here, the reference value may be set to, for example, a value according to the magnitude of displacement at which passage across the bridge BR is permitted. When three-dimensional measurement is performed by the sensor module 101, the displacement included in the measurement information may include multiple components, and in such a case, the reference value is determined in advance for each component. When the displacement includes multiple components, the reference value may be set to a single value common to the multiple components, or different values ​​may be set for some or each of the multiple components. Note that the displacement may be a single component, and in this case, the reference value is one.

[0060] The second server communication unit 114 communicates with the terminal device 103. For example, the second server communication unit 114 transmits response information to the terminal device 103 in response to a transmission request from the terminal device 103.

[0061] The response information includes, for example, at least one of the result of the determination made by the determining section 113 and the measurement information adopted for the determination.

[0062] The server display unit 115 displays various information. For example, in response to an operation by a user of the server device 102, the server display unit 115 displays at least one of the result of the determination made by the determination unit 113 and the measurement information adopted for the determination.

[0063] Each of second server communication unit 114 and server display unit 115 according to the present embodiment is an example of an output unit that outputs determination information indicating the result of determination by determination unit 113.

[0064] (Functional configuration of terminal device 103) The terminal device 103 is a device for a user to mainly refer to measurement information and determination information. The terminal device 103 transmits a transmission request to the server device 102, and receives and displays response information transmitted from the server device 102 in response to the transmission request.

[0065] In detail, as shown in FIG. 6, the terminal device 103 functionally includes a request sending unit 116, a response receiving unit 117, and a terminal display unit 118.

[0066] In response to an input operation by the user, the request transmitting unit 116 transmits a transmission request to the server device 102. The response receiving unit 117 receives response information transmitted from the server device 102. The terminal display unit 118 displays the response information on a screen.

[0067] (Operation of the displacement detection system 100) So far, the configuration of the displacement detection system 100 according to the first embodiment of the present invention has been described. From here, the operation of the displacement detection system 100 according to the present embodiment (a three-dimensional girder displacement detection method for bridges) will be described with reference to FIG.

[0068] When the sensor module 101 and the server device 102 are powered on, they are normally in continuous operation and capable of communicating with each other. In addition, the terminal device 103 starts operating in response to an operation by the user of the terminal device 103, such as when the user starts a program.

[0069] As shown in FIG. 7, the first server communication unit 111 transmits a measurement request to the multiple sensor modules 101 via the network N1 (step S101).

[0070] In detail, for example, the first server communication unit 111 transmits a measurement request when an earthquake occurs. In this case, the first server communication unit 111 may detect the earthquake by acquiring notification information that is generally issued simultaneously when an earthquake occurs, and transmit the measurement request.

[0071] When the measurement request is transmitted, the determining unit 113 starts measuring the elapsed time from the reference time, which is the time when the measurement request is transmitted (step S102).

[0072] When the sensor module 101 receives a measurement request from the server device 102 (step S103), each of the measurement units 109 performs a measurement process (step S104).

[0073] The measurement process is a process for measuring the displacement of the bridge girder BG to which the antennas 104_A and 104_B are associated, based on the output signals from the antennas 104_A and 104_B.

[0074] In this embodiment, the change in relative position between the adjacent ends of adjacent bridge girders BG is measured in three dimensions, and therefore the change in relative position includes the gap, lateral displacement, and step between the adjacent ends of adjacent bridge girders BG.

[0075] As shown in FIG. 8, the mesh opening is the magnitude of the change in relative position between adjacent ends of adjacent bridge girders BG in the bridge axis direction (in the present embodiment, the left-right direction).

[0076] As shown in Figure 9, lateral deviation is the magnitude of change in relative position between the adjacent ends of adjacent bridge girders BG in a direction parallel to the road surface S on the bridge girders BG and perpendicular to the bridge axis direction (in this embodiment, the front-to-rear direction).

[0077] As shown in FIG. 10, the step is the magnitude of the change in relative position between adjacent ends of adjacent bridge girders BG in a direction perpendicular to the road surface S (in this embodiment, the vertical direction).

[0078] In addition, the change in the relative position between adjacent ends of adjacent bridge girders BG may include the magnitude of the change in the relative position between the adjacent ends in at least one direction.

[0079] Also in this embodiment, the measuring unit 109 measures the change in the relative position between the adjacent ends of adjacent bridge girders BG based on the difference between the output signal from antenna 104_A and the output signal from antenna 104_B.

[0080] This makes it possible to reduce noise and other factors commonly contained in the output signals, thereby enabling more accurate measurements to be made than if the positions of the antennas 104_A and 104_B were measured independently based on the output signals of the antennas 104_A and 104_B.

[0081] Referring again to FIG. Each of the sensor communication units 110 transmits measurement information including the measurement result obtained in step S101 via the wireless network N1 (step S105).

[0082] The first server communication unit 111 receives the measurement information transmitted in step S102 via the wireless network N1 (step S106).

[0083] The determining unit 113 determines whether the bridge BR is passable based on the measurement information received in step S103 (step S107).

[0084] In detail, the determination unit 113 acquires the measurement information from the measurement history storage unit 112 or the first server communication unit 111. Note that the determination unit 113 may acquire the measurement information from the first server communication unit 111.

[0085] The determining unit 113 then determines whether the bridge BR is passable by comparing each component of the displacement contained in the measurement information with a reference value that is determined in advance for each component.

[0086] In this embodiment, the measurement result includes three components, the mesh size, the lateral deviation, and the step, as described above, so the reference value includes a first reference value corresponding to the mesh size, a second reference value corresponding to the lateral deviation, and a third reference value corresponding to the step. The first reference value is, for example, 300 mm (millimeters). The second reference value is, for example, 250 mm. The third reference value is, for example, 50 mm.

[0087] The reference value for each component included in the measurement information may be a common value for some or all of the components. Also, the measurement information may include only one displacement component, and in this case, the reference value may be a single value corresponding to that component.

[0088] For example, the determination unit 113 determines that the bridge BR is passable when all of the displacement components included in the measurement information are within the range of the reference value corresponding to each component. Also, for example, the determination unit 113 determines that the bridge BR is impassable when at least one of the displacement components included in the measurement information exceeds the range of the corresponding reference value.

[0089] Furthermore, the determination unit 113 may determine that the bridge BR is impassable when no measurement information can be acquired from the sensor module 101 even when the time elapsed from the reference time exceeds a predetermined time. The reference time may be when an earthquake occurs. In such a case, there is a possibility that a fault that makes it impossible to measure displacement has occurred, such as a wire break in the sensor module 101 caused by the earthquake.

[0090] The determination unit 113 holds the result of the determination and the measurement information used for the determination. As a result, the determination unit 113 holds the latest result of the determination and the measurement information used for the determination.

[0091] Furthermore, the determination unit 113 generates measurement history information that associates the result of the determination, the measurement information used in the determination, and measurement time information of the measurement information, and stores the measurement history information in the measurement history storage unit 112.

[0092] At this time, at least one of the result of the judgment and the measurement information used in the judgment may be displayed on the server display unit 115. This allows the user of the server device 102 to know whether the bridge BR is passable or not by referring to the judgment result and the measurement information on the screen.

[0093] In addition, when an earthquake occurs, the condition of the bridge BR may change from moment to moment, so when an earthquake occurs, the processing of steps S101 to S104 may be performed continuously at predetermined time intervals (e.g., 5 minutes, 10 minutes) for a predetermined period of time (e.g., 1 hour, 2 hours).

[0094] In response to an input operation by the user, the request transmitting unit 116 transmits a transmission request to the server device 102 via the network N2 (step S108).

[0095] The second server communication unit 114 receives the transmission request transmitted in step S105 via the network N2 (step S109).

[0096] In response to receiving the transmission request in step S106, the second server communication unit 114 performs step The second server communication unit 114 acquires the latest judgment result stored in the judgment unit 113 and the measurement information used for the judgment from the judgment unit 113. The second server communication unit 114 transmits response information including the acquired judgment result and measurement information to the terminal device 103 via the network N2 (step S110).

[0097] The response receiving unit 117 receives the response information transmitted from the server device 102 via the network N2 (step S111).

[0098] The terminal display unit 118 displays the response information received in step S108 on the screen (step S112). This allows the user of the terminal device 103 to know whether the bridge BR is passable or not by referring to the judgment result and the measurement information on the screen.

[0099] So far, the first embodiment of the present invention has been described.

[0100] According to this embodiment, the measurement result by the measurement unit 109 is transmitted from the sensor module 101 wirelessly.

[0101] This allows the user of the server device 102 or the terminal device 103 to know the extent of the displacement at a location away from the bridge BR when a relative displacement occurs at the adjacent ends of adjacent bridge girders BG. Also, the process in which the measuring unit 109 measures the displacement of the adjacent ends of adjacent bridge girders BG and transmits it wirelessly can be executed almost instantly at a desired time even during an earthquake. In other words, the user of the server device 102 or the terminal device 103 can determine whether or not the bridge BR can be passed at a desired time almost instantly.

[0102] Therefore, it becomes possible to quickly find out whether the bridge BR is passable or not.

[0103] Furthermore, in general, for example, when multiple bridge girders BG are displaced overall while roughly maintaining their relative positional relationship, a vehicle can pass over the multiple bridge girders BG. Therefore, to determine whether or not a vehicle can pass, it is sufficient to measure the relative positions between the adjacent ends of adjacent bridge girders BG, and the absolute positions of each bridge girder BG are not very important.

[0104] Therefore, in this embodiment, the change in the relative position between the adjacent ends of the adjacent bridge girders BG is measured. The change in the relative position between the adjacent ends may be modified to be obtained as the difference in the absolute positions of the ends, but as explained in this embodiment, the measurement accuracy can be improved by obtaining it from the difference between the output signal from antenna 104_A and the output signal from antenna 104_B.

[0105] Therefore, it becomes possible to quickly and accurately know whether the bridge BR is passable or not.

[0106] Furthermore, the measurement result of the measuring unit 109 includes a plurality of components of the displacement of the adjacent ends of the adjacent bridge girders BG. This allows the user of the server device 102 or the terminal device 103 to know the magnitude of the relative displacement in a plurality of directions for the adjacent ends. This allows the user to know more accurately the relative displacement occurring at the adjacent ends. This makes it possible to quickly and more accurately know whether the bridge BR is passable or not.

[0107] Furthermore, the determination unit 113 determines whether the bridge BR is passable. This allows the user of the server device 102 or the terminal device 103 to know the result of the determination at a location away from the bridge BR. This makes it possible to quickly and easily know whether the bridge is passable or not.

[0108] The first embodiment of the present invention may be modified as follows.

[0109] <<Variation 1>> In the first embodiment, an example has been described in which the sensor module 101 executes the measurement process (step S104) upon receiving a measurement request from the server device 102. However, the timing of performing the measurement process (step S104) is not limited to when the measurement request is received from the server device 102. In the first modification, as another example of the timing of performing the measurement process (step S104), an example will be described in which the measurement process (step S104) is performed when a predetermined measurement time arrives, such as once a day to once a week.

[0110] The measurement process (step S101) may be performed in response to a measurement request as in embodiment 1, and may be performed when a predetermined time arrives as in this modified example.

[0111] The measurement section 109 according to this modification has the function of judging whether or not a predetermined measurement time has arrived, in addition to the functions of the measurement section 109 according to the first embodiment.

[0112] Except for this point, the displacement detection system according to this modification may be configured similarly to the first embodiment.

[0113] The operation of the displacement detection system according to this modified example (a three-dimensional girder displacement detection method for bridges) will be described with reference to FIG.

[0114] The three-dimensional girder displacement detection method for a bridge according to this modification includes step S201 instead of steps S101 to S103 of the three-dimensional girder displacement detection method for a bridge according to embodiment 1. Except for this point, the three-dimensional girder displacement detection method for a bridge according to this modification is generally similar to the three-dimensional girder displacement detection method for a bridge according to embodiment 1.

[0115] In step S201, as shown in FIG. 11, the measurement unit 109 determines whether or not the measurement time has arrived (step S201).

[0116] For example, if the measurement process is executed once a day, the measurement time may be set by time, and the measurement unit 109 may detect that the current time is a predetermined time. Then, when the measurement unit 109 detects that the current time is the measurement time, it may determine that the measurement time has arrived. Also, when the measurement unit 109 does not detect that the current time is the measurement time (i.e., the current time is not the measurement time), it may determine that the measurement time has not arrived.

[0117] Also, for example, if the measurement process is executed once a week, the measurement time may be set by a day of the week and a time, and the measurement unit 109 may detect that the current day of the week and time are predetermined days of the week and time. Then, when it is detected that the current day of the week and time are the measurement time, the measurement unit 109 may determine that the measurement time has arrived. Also, when it is not detected that the current day of the week and time are the measurement time (i.e., the current day of the week and time are not the measurement time), the measurement unit 109 may determine that the measurement time has not arrived.

[0118] When it is determined that the measurement time has not arrived (step S201; NO), the measurement unit 109 repeatedly executes the process of determining whether the measurement time has arrived (step S201).

[0119] When it is determined that the measurement time has arrived (step S201; YES), the measurement unit 109 performs the same measurement process as in the first embodiment (step S104).

[0120] Generally, relative displacement of the adjacent ends of adjacent bridge girders BG may occur due to a cause for which notification information cannot be obtained from outside, such as the occurrence of an earthquake. According to this modified example, the measurement time can be set by time. Therefore, when relative displacement of the bridge girders BG occurs, the user can determine the extent of the relative displacement of the bridge girders BG and determine whether or not the bridge BR can be passed through, at least with a time delay corresponding to the time set in the measurement time, and at a location away from the bridge BR. Therefore, this modified example also makes it possible to quickly know whether or not the bridge BR can be passed through.

[0121] <<Embodiment 2>> In the first embodiment, an example has been described in which two antennas 104_A, 104_B are provided near the adjacent ends of adjacent bridge girders BG, respectively, to measure the mesh opening, lateral displacement, and step of the adjacent ends.

[0122] In the second embodiment, an example will be described in which two antennas 104_A and 104_B are provided near the end of a common bridge girder BG, and the rotation of the bridge girder BG is measured as a displacement. In the present embodiment, the configuration different from the first embodiment will be mainly described, and the common configuration will be omitted as appropriate for the sake of simplicity.

[0123] A three-dimensional girder displacement detection system for bridges (hereinafter also simply referred to as a "displacement detection system") 200 according to embodiment 2 of the present invention includes a plurality of three-dimensional girder displacement sensor modules for bridges (hereinafter also simply referred to as "sensor modules") 201, a server device 202, and a terminal device 103 that is physically and functionally similar to that of embodiment 1, as shown in FIG. 12.

[0124] Each of the sensor modules 201 and the server device 202 communicate with each other via the network N1, as in the first embodiment. The server device 202 and the terminal device 103 communicate with each other via the network N2, as in the first embodiment.

[0125] (Physical configuration of the sensor module 201) The sensor module 201 includes two antennas 204_A and 204_B, and a storage box SB connected to the antennas 204_A and 204_B by conductors W_A and W_B, respectively. In this embodiment, the antennas 204_A and 204_B are provided near both ends of a common bridge girder BG, respectively.

[0126] In this way, except for the bridge girder BG to which the two antennas 204_A and 204_B are associated, the physical configuration of the sensor module 201 is generally similar to that of the sensor module 101 according to the first embodiment.

[0127] (Physical configuration of server device 202) The physical configuration of the server device 202 is generally similar to that of the server device 102 according to the first embodiment.

[0128] (Functional configuration of sensor module 201) The sensor module 201 is functionally similar to the sensor module 101 of embodiment 1 in that it measures the displacement of the bridge girder BG to which the multiple antennas 204_A, 204_B are associated based on output signals from the multiple antennas 204_A, 204_B.

[0129] As shown in FIG. 13, a sensor module 201 according to this embodiment includes a measurement unit 209 and a sensor communication unit 110 similar to that of the first embodiment.

[0130] The measuring unit 209 measures the displacement of the bridge girder BG to which the antennas 204_A and 204_B are associated, based on the output signals from the antennas 204_A and 204_B, as in the first embodiment.

[0131] In this embodiment, the bridge girder BG to which the antennas 204_A and 204_B are associated is a common bridge girder BG. Then, as the displacement of the bridge girder BG, the change in angle of the extension direction of the bridge girder BG with respect to a predetermined bridge axis direction is measured. Therefore, the measurement information according to this embodiment is information indicating the change in angle, and the angle is preferably measured three-dimensionally. Note that the angle may also be measured two-dimensionally.

[0132] Here, when the upper surface of the bridge girder BG forms a substantially even road surface S without any gaps, the extension direction of the bridge girder BG is generally along the predetermined bridge axis direction. Therefore, in this embodiment, it can be said that the change in the angle of the extension direction of the bridge girder BG is measured as the displacement of the bridge girder BG based on the position where the upper surface of the bridge girder BG forms a substantially even road surface S without any gaps.

[0133] (Functional configuration of server device 202)

[0134] Functionally, the server device 202 is a device that manages the displacement detection system 200, and, for example, as a passage determination device, determines the passability of the bridge BR based on the measurement information transmitted from the sensor communication unit 110, and outputs the result of the determination, which is similar to the server device 102 in embodiment 1.

[0135] Functionally, as shown in FIG. 14, the server device 202 of this embodiment includes a determination unit 213, a first server communication unit 111, a measurement history memory unit 112, a second server communication unit 114, and a server display unit 115 similar to those of embodiment 1.

[0136] The determination unit 213 acquires measurement information from the measurement history storage unit 112 or the first server communication unit 111, and compares the angle included in the measurement information with a predetermined reference value for the angle to determine the passability of the bridge BR. As with the first embodiment, the reference value in this embodiment may be set to a value according to the magnitude of displacement that allows passage across the bridge BR.

[0137] (Operation of the displacement detection system 200) So far, the configuration of the displacement detection system 200 according to the second embodiment of the present invention has been described. From here, the operation of the displacement detection system 200 according to the present embodiment (a three-dimensional girder displacement detection method for bridges) will be described with reference to FIG.

[0138] As shown in the figure, the three-dimensional girder displacement detection method for a bridge according to this embodiment includes steps S204 and S207 instead of steps S104 and S107, respectively, of the three-dimensional girder displacement detection method for a bridge according to embodiment 1. Except for these points, the three-dimensional girder displacement detection method for a bridge according to this embodiment is generally similar to the three-dimensional girder displacement detection method for a bridge according to embodiment 1.

[0139] In step S204, as shown in Fig. 15, each of the measuring units 209 performs a measurement process. In the measurement process according to the present embodiment, based on the output signals from the antennas 204_A and 204_B, the rotation of the bridge girder BG to which the antennas 204_A and 204_B are associated is measured as a change in position of the bridge girder BG.

[0140] As described above, the rotation is the magnitude of the change in angle of the extension direction of the bridge girder BG with respect to the predetermined bridge axis direction (see FIG. 16).

[0141] Also in this embodiment, the measuring unit 209 measures the change in the relative position of the bridge girder BG to which the antennas 204_A and 204_B are commonly associated, based on the difference between the output signal from the antenna 204_A and the output signal from the antenna 204_B. As in the first embodiment, accurate measurement is possible.

[0142] Referring again to FIG. In step S207, the determining unit 213 determines whether the bridge BR is passable based on the measurement information received in step S103, as in the first embodiment.

[0143] In detail, as in embodiment 1, the judgment unit 213 acquires measurement information from the measurement history memory unit 112 or the first server communication unit 111, and judges the passability of the bridge BR by comparing the displacement components contained in the measurement information with predetermined reference values ​​for the components.

[0144] In this embodiment, since the measurement result includes only the rotation component as described above, the reference value needs to be only the fourth reference value corresponding to the rotation.

[0145] For example, the determination unit 213 determines that the bridge BR is passable when the rotation included in the measurement information is within the range of the fourth reference value. Also, for example, the determination unit 213 determines that the bridge BR is impassable when the rotation included in the measurement information exceeds the range of the fourth reference value.

[0146] Also, similar to embodiment 1, if the judgment unit 213 is unable to acquire measurement information from the sensor module 101 even when the elapsed time from the reference time exceeds a predetermined time, the judgment unit 213 may determine that the bridge BR is impassable.

[0147] The judgment unit 213 holds the result of the judgment and the measurement information used in the judgment. The judgment unit 213 also generates measurement history information that associates the result of the judgment, the measurement information used in the judgment, and measurement time information of the measurement information, and stores the measurement history information in the measurement history storage unit 112. At this time, at least one of the result of the judgment and the measurement information used in the judgment may be displayed on the server display unit 115. These are also similar to those in the first embodiment.

[0148] So far, the second embodiment of the present invention has been described.

[0149] In this embodiment, similarly to the first embodiment, the measurement result by the measuring unit 209 is wirelessly transmitted from the sensor module 201.

[0150] This allows the user of the server device 202 or the terminal device 103 to know the extent of displacement at a location away from the bridge BR when displacement occurs in the bridge girder BG associated with the antennas 204_A and 204_B. Also, the process of measuring the displacement of the bridge girder BG associated with the antennas 204_A and 204_B and transmitting it wirelessly can be executed almost instantly at a desired time even during an earthquake. That is, the user of the server device 202 or the terminal device 103 can determine whether or not the bridge BR can be passed at a desired time almost instantly.

[0151] Therefore, it becomes possible to quickly find out whether the bridge BR is passable or not.

[0152] <<Embodiment 3>> In the first embodiment, an example has been described in which two antennas 104_A, 104_B are provided near the adjacent ends of adjacent bridge girders BG, respectively, to measure the mesh opening, lateral displacement, and step of the adjacent ends.

[0153] In this embodiment, an example will be described in which a third antenna is further provided near the end of the bridge girder BG shared with antenna 104_A. This allows rotation to be further measured in the same manner as in embodiment 2. In this embodiment, mainly the configuration different from embodiment 1 will be described, and common configurations will be omitted as appropriate for simplicity.

[0154] A three-dimensional girder displacement detection system for bridges (hereinafter also simply referred to as a "displacement detection system") 300 according to embodiment 2 of the present invention includes a plurality of three-dimensional girder displacement sensor modules for bridges (hereinafter also simply referred to as "sensor modules") 301, a server device 302, and a terminal device 103 that is physically and functionally similar to that of embodiment 1, as shown in FIG. 17.

[0155] Each of the sensor modules 301 and the server device 302 communicate with each other via the network N1, as in the first embodiment. The server device 302 and the terminal device 103 communicate with each other via the network N2, as in the first embodiment.

[0156] (Physical configuration of the sensor module 301) The sensor module 301 includes three antennas 104_A, 104_B, and 304_C, and a storage box SB connected to the antennas 104_A, 104_B, and 304_C by conductors W_A, W_B, and W_C, respectively. The antennas 104_A and 104_B according to this embodiment are provided near the respective adjacent ends of adjacent bridge girders BG, as in the first embodiment.

[0157] The antenna 304_C is provided near an end of the bridge girder BG at which the antenna 104_A is provided, which is different from the end in the vicinity of which the antenna 104_A is provided.

[0158] One of the antennas 104_A and 104_B according to the present embodiment corresponds to a first antenna, and the other of the antennas 104_A and 104_B according to the present embodiment corresponds to a second antenna. Moreover, the antenna 304_C corresponds to a third antenna.

[0159] Instead of the antenna 304_C, an antenna 104_B located near the antenna 304_C may be connected to the storage box SB as a third antenna by a conductor W_C. In this case, the antenna 104_B is shared by the adjacent storage box SB, and the mesh opening, lateral displacement, step and step can be measured with fewer antennas than in this embodiment. This makes it possible to reduce costs.

[0160] In this way, the antenna 304_C is further provided in association with the bridge girder BG shared with the antenna 104_A. A receiving module 105_C is further provided and connected to the antenna 304_C via a conductor W_C, and the receiving module 105_C is connected to the control module 106 shared with the receiving modules 105_A and 105B. Except for these points, the physical configuration of the sensor module 301 is generally similar to that of the sensor module 101 according to the first embodiment.

[0161] (Physical configuration of server device 302) The physical configuration of the server device 302 is generally similar to that of the server device 102 according to the first embodiment.

[0162] (Functional configuration of sensor module 301) The sensor module 301 is functionally similar to the sensor module 101 of embodiment 1 in that it measures the displacement of the bridge girder BG to which the multiple antennas 104_A, 104_B, 304_C are associated based on output signals from the multiple antennas 104_A, 104_B, 304_C.

[0163] As shown in FIG. 18, a sensor module 301 according to this embodiment includes a measurement unit 309 and a sensor communication unit 110 similar to that of the first embodiment.

[0164] The measurement unit 309 measures the relative displacement of adjacent bridge girders BG to which the antennas 204_A, 204_B are associated, and the relative displacement of the bridge girders BG to which the antennas 204_A, 304_C are associated, based on the output signals from the antennas 204_A, 204_B, 304_C.

[0165] The adjacent bridge girders BG to which the antennas 104_A and 104_B are associated may be measured in the same manner as in embodiment 1, for example, the mesh size, lateral displacement, and step of the adjacent ends of the adjacent bridge girders BG are measured. Also, for a common bridge girder BG to which the antennas 204_A and 304_C are associated, the rotation of the bridge girder BG is measured in the same manner as in embodiment 2. Therefore, the measurement information in this embodiment is information indicating the mesh size, lateral displacement, step, and angle change.

[0166] For adjacent bridge girders BG to which antennas 104_A and 104_B are associated, at least one of the opening, lateral displacement, and step difference needs to be measured.

[0167] (Functional configuration of server device 302)

[0168] Functionally, the server device 302 is a device that manages the displacement detection system 300, and, for example, as a passage determination device, determines the passability of the bridge BR based on the measurement information transmitted from the sensor communication unit 110, and outputs the result of the determination, which is similar to the server device 102 in embodiment 1.

[0169] Functionally, as shown in FIG. 19, the server device 302 of this embodiment includes a determination unit 313, a first server communication unit 111, a measurement history memory unit 112, a second server communication unit 114, and a server display unit 115 similar to those of embodiment 1.

[0170] The judgment unit 313 acquires measurement information from the measurement history memory unit 112 or the first server communication unit 111, and judges the passability of the bridge BR by comparing the mesh size, lateral deviation, step, and angle contained in the measurement information with the corresponding reference values ​​(first reference value to fourth reference value).

[0171] The reference value is set to a value corresponding to the magnitude of displacement at which passage across the bridge BR is permitted, as in embodiment 1 for the first to third reference values ​​corresponding to mesh opening, lateral displacement, and step, and as in embodiment 2 for the fourth reference value corresponding to the angle.

[0172] (Operation of the displacement detection system 300) So far, the configuration of the displacement detection system 300 according to the third embodiment of the present invention has been described. From here, the operation of the displacement detection system 300 according to the present embodiment (a three-dimensional girder displacement detection method for bridges) will be described with reference to FIG.

[0173] As shown in the figure, the three-dimensional girder displacement detection method for a bridge according to this embodiment includes steps S304 and S307 instead of steps S101 and S104, respectively, of the three-dimensional girder displacement detection method for a bridge according to embodiment 1. Except for these points, the three-dimensional girder displacement detection method for a bridge according to this embodiment is generally similar to the three-dimensional girder displacement detection method for a bridge according to embodiment 1.

[0174] In step S304, as shown in Fig. 20, each of the measuring units 309 performs a measurement process. In the measurement process according to this embodiment, based on the output signals from the antennas 104_A, 104_B, 304_C, the mesh opening, lateral displacement, step, and rotation of the bridge girder BG are measured as changes in the position of the bridge girder BG to which the antennas 104_A, 104_B, 304_C are associated.

[0175] Also in this embodiment, the measurement unit 309 measures the mesh opening, lateral shift, and step of the adjacent ends of the bridge girders BG to which they are associated, i.e., adjacent bridge girders BG, based on the difference between the output signal from antenna 104_A and the output signal from antenna 104_B.

[0176] Furthermore, the measurement unit 309 measures the rotation of the bridge girder BG to which the output signal from the antenna 104_A and the output signal from the antenna 304_C are commonly associated, based on the difference between these signals.

[0177] That is, among the three antennas 104_A, 104_B, and 304_C, the antenna 104_A located in the middle is used as a reference for both the measurement of the mesh size, lateral deviation, and step, and the measurement of the rotation. This allows for highly accurate measurements, as in the first embodiment.

[0178] Referring again to FIG. In step S307, the determining unit 313 determines whether the bridge BR is passable based on the measurement information received in step S103, as in the first embodiment.

[0179] In detail, as in embodiment 1, the judgment unit 313 acquires measurement information from the measurement history memory unit 112 or the first server communication unit 111, and judges the passability of the bridge BR by comparing each component of the displacement contained in the measurement information with a predetermined reference value for each component.

[0180] In this embodiment, the measurement result includes the four components of the mesh opening, lateral deviation, step, and rotation, as described above, and therefore the reference value includes a first reference value corresponding to the mesh opening, a second reference value corresponding to the lateral deviation, a third reference value corresponding to the step, and a fourth reference value corresponding to the rotation.

[0181] The determination unit 313 determines that the bridge BR is passable, for example, when all of the components (mesh opening, lateral displacement, step, and rotation) included in the measurement information are within the ranges of the corresponding reference values ​​(first to fourth reference values). Also, for example, the determination unit 313 determines that the bridge BR is impassable, when at least one of the displacement components included in the measurement information exceeds the range of the corresponding reference value.

[0182] Also, similarly to the first embodiment, if the determination unit 313 is unable to acquire measurement information from the sensor module 101 within a predetermined time from the reference time, it may determine that the bridge BR is impassable.

[0183] The judgment unit 313 holds the result of the judgment and the measurement information used in the judgment. The judgment unit 313 also generates measurement history information that associates the result of the judgment, the measurement information used in the judgment, and measurement time information of the measurement information, and stores the measurement history information in the measurement history storage unit 112. At this time, at least one of the result of the judgment and the measurement information used in the judgment may be displayed on the server display unit 115. These are also similar to those in the first embodiment.

[0184] So far, the third embodiment of the present invention has been described.

[0185] This embodiment also provides the same functions and effects as the first embodiment.

[0186] Furthermore, the measurement results of the measuring unit 309 according to this embodiment measure the displacement of the bridge girder BG, which includes more components than in the first embodiment. This allows the user of the server device 302 or the terminal device 103 to know the magnitude of relative displacement in many directions for the bridge girder BG. This allows the user to know more accurately the relative displacement occurring in the bridge girder BG. This makes it possible to quickly and more accurately know whether the bridge BR is passable or not.

[0187] Although the embodiment and the modified examples of the present invention have been described above, the present invention is not limited to these. For example, the present invention also includes a form in which some or all of the embodiment and the modified examples described so far are appropriately combined, and a form in which the form is appropriately modified. [Explanation of symbols]

[0188] 100,200,300 3D girder displacement detection system for bridges (displacement detection system) BR Bridge D Support structure BG Bridge girder S road surface 101, 201, 301 3D girder displacement sensor module for bridges (sensor module) 102,202,302 Server equipment 103 Terminal Equipment 104_A, 104_B, 204_A, 204_B, 304_C Antenna 105_A, 105_B Receiving module 106 Control Module 107 Communication Module 108 Power supply 109,209,309 Measuring part 110 Sensor communication unit 111 First Server Communication Department 112 Measurement history memory unit 113,213,313 Judgment section 114 Second Server Communication Department 115 Server Display 116 Request sending part 117 Response Reception Unit 118 Terminal display unit

Claims

1. a first antenna, a second antenna, and a third antenna for receiving radio waves for position detection; a measurement unit that measures the displacement of a bridge girder to which the first antenna, the second antenna, and the third antenna are associated and a bridge girder adjacent to the bridge girder, based on output signals from the first antenna, the second antenna, and the third antenna; a sensor communication unit that wirelessly transmits measurement information including a result of measurement by the measurement unit; The first antenna is provided near one of both ends in the extension direction of the bridge girder, The second antenna is provided in the vicinity of an end portion close to the one end portion of the two end portions of the adjacent bridge girders in the extension direction, the third antenna is provided near the other of the two end portions, The measurement unit includes: Measure a change in relative position between adjacent ends of the bridge girder and the adjacent bridge girder as the displacement based on a difference between the output signals from the first antenna and the second antenna; Based on a difference between the output signals from the first antenna and the third antenna, a change in an angle of the extension direction of the bridge girder with respect to a predetermined bridge axis direction is measured as the displacement. 3D girder displacement sensor module for bridges.

2. Each of the plurality of antennas is provided at the upper end or above the side of the associated bridge girder.

2. The three-dimensional girder displacement sensor module for bridges according to claim 1.

3. A plurality of three-dimensional bridge girder displacement sensor modules according to claim 1 or 2; A passage determination device is provided, The passage determination device determines whether a bridge is passable based on the measurement information transmitted from the sensor communication unit, and outputs the result of the determination. 3D girder displacement detection system for bridges.

4. A three-dimensional girder displacement sensor module for bridges, comprising an antenna for receiving radio waves for position detection, the first antenna being provided near one of both ends in the extension direction of the bridge girder, a second antenna being provided near the end closest to the one end of both ends in the extension direction of a bridge girder adjacent to the bridge girder, and a third antenna being provided near the other end of the both ends, Measuring the displacement of the bridge girder and the adjacent bridge girder to which the first antenna, the second antenna, and the third antenna are associated based on output signals from the first antenna, the second antenna, and the third antenna; and wirelessly transmitting measurement information including the measured result; Measuring the displacement comprises: Measuring a change in relative position between adjacent ends of the bridge girder and the adjacent bridge girder as the displacement based on a difference between output signals from the first antenna and the second antenna; and measuring, as the displacement, a change in an angle of an extension direction of the bridge girder with respect to a predetermined bridge axis direction based on a difference between output signals from the first antenna and the third antenna. A method for detecting three-dimensional girder displacement for bridges.

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