JP4373388B2 - Displacement information acquisition system - Google Patents

Description

  The present invention relates to a displacement information acquisition system that acquires, in real time, displacement information of, for example, a side wall of a vertical hole formed at a construction site or a beam or a column of a building.

  Conventionally, at construction sites, so-called mountain retaining work is performed so that the side walls of the vertical holes formed by excavation do not collapse.

  The important thing in the construction of this mountain retaining work is to measure the change in the slope of the above-mentioned side wall that has been fixed by some method, and if it is recognized that there is an abnormality, immediately perform repairs, reinforcement, etc. There is a point that must be secured.

  By the way, as an inclination measurement system that simultaneously measures changes in inclination of a side wall or the like at a plurality of measurement positions, there is a structure disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-97694 (Patent Document 1).

The outline of the conventional tilt measurement system is a group of tilters that output tilt signals measured by themselves in correspondence with self-identification information and output them as electrical signals, computers connected to these by wire, and self-identification by receiving electrical signals. The controller includes a controller that transmits the inclination value as a digital signal to the computer in correspondence with information.
JP 2000-97694 A

  However, although the inclination measurement system is considered to measure the inclination value at a predetermined sampling rate, an abnormality occurs because the inclination value is only monitored manually. It is easy to overlook, thus reducing the reliability of the system.

In addition, since the tilt value transmitted from the inclinometer is once received by the controller, predetermined signal processing is performed, and the processed tilt value is transmitted to the computer. For example, wireless communication is performed between the controller and the computer. Wireless communication cannot be performed when a structure such as an obstructing steel frame is installed.
In this case, in order to switch to wired communication, a cable or the like must be laid between the controller and the computer.

  Furthermore, since the controller controls all the tilters, if the controller that is the control center fails, there is a serious problem that data of all the tilters connected to the controller cannot be collected. is there.

  Therefore, the first object of the present invention is to reliably detect that an abnormality has occurred in the target object and promptly notify the occurrence of the abnormality. With this first object, some terminal devices and the main body A second purpose is to provide a displacement information acquisition system that can reliably transmit displacement information to be transmitted from another terminal device to the main unit even when a situation in which displacement information cannot be transmitted to or received from the device occurs. Yes.

The configuration of the present invention for achieving the above object is as follows.
The displacement information acquisition system according to the present invention connects a plurality of terminal devices that are arranged at predetermined positions of an object and acquire displacement information at each predetermined position, and a main body device via a wireless communication network. In the displacement information acquisition system, the main body device determines abnormality based on the displacement information transmitted from each terminal device, and abnormality determination means for determining abnormality of the object, and the abnormality determination means The abnormality notifying means for notifying each terminal device of the abnormality, the transmission requesting means for transmitting the displacement information of the object to each terminal device at a predetermined time interval, and the abnormality determining means When it is determined that there is, the transmission time switching means for shortening the transmission time interval of the displacement information than before the determination, the rain detection sensor for detecting the rain, and the rain detection sensor. And rainfall was detected rain determination means for determining whether or not exceeds a predetermined reference value by, in response to the transmit request, and determines transmission & reception determination means for determining whether transmission of the displacement information from each terminal device has been made When the transmission / reception determination unit determines that the displacement information is not transmitted from one terminal device, the maintenance information request unit requests the other terminal device to transmit the maintenance information of the one terminal device. And the terminal device, displacement information acquisition means for acquiring the displacement information of the object, displacement information transmission means for transmitting the acquired displacement information to the main body device at a predetermined time interval, displacement information is transmitted to the main unit, and routing means are provided for relaying each transmission request transmitted from the main apparatus to each terminal device, send the displacement information When there is a transmission request from the transmission request means, the means transmits the displacement information of the object in response to the transmission request, and the transmission time switching means uses the rainfall determination means to determine whether the rainfall is When it is determined that a certain reference value has been exceeded, the transmission time interval of displacement information is made shorter than before the determination, and when the other terminal device receives maintenance request information from the main unit, The maintenance request information is transferred to the one terminal device by the routing means, and the maintenance report information of the one terminal device is transmitted to the main device .

In the displacement information acquisition system according to the present invention, the displacement information transmission time interval is different for each preset terminal device.

In the displacement information acquisition system according to the present invention , the transmission time switching means shortens the transmission time interval of the displacement information according to the degree of abnormality.

Further, in the displacement information acquisition system according to the present invention , the main body device includes an earthquake detection sensor that detects an earthquake, and an earthquake determination unit that determines whether or not an earthquake detected by the earthquake detection sensor has a certain seismic intensity or more. DOO are further provided, it means switching transmission time, by the seismic determination means, when it is determined that the detected seismic exceeds a certain seismic intensity, the transmission time interval of the displacement information is shorter than the time of the determination previously It is characterized by that.

Further, in the displacement information acquisition system according to the present invention , a relay device is provided that relays the displacement information transmitted from each terminal device to the main device and the transmission request signal transmitted from the main device to each terminal device. It is characterized by.

In the displacement information acquisition system according to the present invention , the main body device is provided with a display, and the abnormality notifying means converts the displacement information of the object transmitted from each terminal device into a visual change and displays the display. It is characterized by being displayed on .

Further, in the displacement information acquiring system according to the present invention, the displacement information transmission means, together with the displacement information, it is characterized by transmitting identification information for identifying the time data and the terminal apparatus acquires the displacement information.

According to the present invention, the following effects can be obtained.
In the terminal device, the displacement information of the object is acquired, and the acquired displacement information is transmitted to the main body device at a predetermined time interval. In the main body device, the object is based on the displacement information transmitted from each terminal device. When the abnormality is determined and the abnormality is determined, the abnormality is notified for each terminal device, so that the abnormality is surely detected in the target object, and the occurrence of the abnormality is immediately notified. be able to.

Further , according to the present invention, since the displacement information transmission time interval is varied for each preset terminal device, the displacement information can be acquired in accordance with the situation of the object on which the terminal device is installed.

In addition, according to the present invention, the displacement information transmission time interval is made shorter than before the determination by determining that it is abnormal, so that it is possible to acquire the displacement information of the abnormal location in detail. it can.

Further , according to the present invention, since the displacement information transmission time interval is shortened according to the degree of abnormality, the displacement information of the abnormal part can be acquired in detail according to the degree of abnormality.

Further , according to the present invention, when it is determined that the rainfall detected by the rainfall detection sensor has exceeded a certain reference value, the transmission time interval of the displacement information is made shorter than before the determination, so that an abnormal location The displacement information can be acquired in detail. Therefore, it is possible to quickly and surely detect the occurrence of an abnormality due to rain.

Further , according to the present invention, when it is determined that the earthquake detected by the earthquake detection sensor has exceeded a certain seismic intensity, the displacement information transmission time interval is shorter than that before the determination, so The displacement information can be acquired in detail. Therefore, it is possible to quickly and surely detect the occurrence of an abnormality due to an earthquake.

Further , according to the present invention, it is determined whether or not displacement information is transmitted from each terminal device in response to a transmission request, and when it is determined that displacement information is not transmitted from one terminal device, Requesting the terminal device to transmit displacement information to be transmitted from the one terminal device, and together with the displacement information related to the one terminal device, the displacement information itself is transmitted together. Even when a situation in which displacement information cannot be transmitted and received between the terminal device and the main body device occurs, displacement information to be transmitted from a part of the terminal devices can be reliably transmitted to the main body device.

According to the present invention, the relay device relays the displacement information transmitted from each terminal device to the main device and the transmission request signal transmitted from the main device to each terminal device. It should be sent from some of the terminal devices even when it cannot send / receive directly to / from the main unit or when there is a situation where displacement information cannot be sent / received between some of the terminal units and the main unit. The displacement information can be reliably transmitted to the main device.

Further , according to the present invention, since the displacement information of the object transmitted from each terminal device is converted into a visual change and displayed on the display, the displacement state can be intuitively determined.

In addition, according to the present invention, since the time data when the displacement information is acquired and the identification information for identifying the terminal device are transmitted together with the displacement information, the position of the displacement and the change of the displacement are accurately grasped. be able to.

The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a displacement information acquisition system according to an embodiment of the present invention.
A displacement information acquisition system A according to an embodiment of the present invention includes a plurality of terminal devices B,..., A relay device C, and a main device D that acquire displacement information of an object W, for example, wirelessly such as a LAN (Local Area Network). It is configured to be connected via a communication network.

“Objects” include various plants such as oil, dams such as hydroelectric power stations, iron bridges, highways, large structures in amusement parks, power transmission towers, tunnels, beams, pillars and walls of subways and underground malls, etc. In addition to structures, it includes the surface of the earth. In this embodiment, the side wall of the vertical hole in a construction site is demonstrated as an example as a target object.
The “displacement information” is an inclination angle of the side wall W as an object in the present embodiment, but may be a deflection, a twist, a temperature, or the like.

The terminal devices B,..., The relay device C, and the main device D can transmit and receive packet data 1 having the following contents between them. FIG. 2 is an explanatory diagram showing the contents of the packet data.
As shown in FIG. 2, the packet data includes identification information 1a such as an ID number for specifying the terminal device B..., The relay device C or the main device D, displacement information 1b, displacement information request information 1c, and the displacement. It includes an acquisition time 1d for acquiring the information 1b, maintenance request information (maintenance report information) 1e (1e '), other data 1f, and the like.

The “maintenance request information 1e” is included in the packet data transmitted from the main device D when transmission of displacement information from the terminal device B is interrupted, and “0”, “1”, “2” Is one of the values.
“0” indicates that there is no request for the terminal device B, “1” indicates that the terminal device B is to perform self-diagnosis, and “2” indicates that the terminal device B is set in advance. Each means making a request.
In the packet data transmitted from the main device D, the displacement information 1b and the acquisition time 1d for acquiring the displacement information 1b are “0”.

The “maintenance report information 1e ′” is included in the packet data transmitted from the terminal device B toward the main device D, and has any one value from “0” to “3”. .
“0” indicates that the result of the self-diagnosis is normal, “1” indicates that the result of the self-diagnosis is abnormal, and “2” indicates that there is a response from the terminal device B set in advance. “3” means that there is no response from the preset terminal device B.
In the packet data transmitted from the terminal device B, the displacement information request information is “0”.

First, the main device D will be described.
The main unit D has a configuration in which a personal computer 3 provided with a display 2 is connected to a wireless unit 4, a rain detection sensor 5 for detecting rainfall, and an earthquake detection sensor 6 for detecting an earthquake via an interface.

The personal computer 3, and thus the main unit D, realizes the following functions by executing a required program. FIG. 3 is a functional block diagram of the main device D.
(1) A function of making a transmission request for displacement information of the side wall (object) W toward each terminal device B at a predetermined time interval. This function is called transmission request means D1.
The “predetermined time interval” is a normal time when an abnormality described later does not occur on the side wall (object) W, and is, for example, twice a day, that is, once every 12 hours. Depending on the time interval, a shorter time interval or a longer time interval may be used.
By setting such a time interval, it is possible to extend the life of the power supply 13 mounted on each terminal device B, which will be described in detail later, and to reliably acquire displacement information of the side wall (object) W. .
“Power supply life” is assumed to be, for example, a period longer than the construction period and not to be cut off within the construction period. Thereby, it is not necessary to perform complicated replacement work of the power supply 13 of each terminal device B.

Further, the predetermined time interval described above may be different for each terminal device B. In other words, it is possible to adopt a configuration in which the transmission time interval of the displacement information is different for each terminal device B set in advance.
“Preliminary terminal device” is, for example, a request for transmission at a rate of about four times a day, that is, about once every six hours, for example, for a terminal device B that is arranged in a position that is assumed to have a large change in inclination. By doing this, it is possible to cope with accuracy even when the change in inclination is fast.
On the other hand, for example, for the terminal device B arranged in a position where it is assumed that the change in inclination is small, a transmission request is made, for example, once a day, that is, once every 24 hours. You may do it.

(2) A function of determining an abnormality of the side wall W based on the displacement information transmitted from each terminal device B ... in response to the transmission request from the transmission request unit D1. This function is referred to as abnormality determination means D2.
The displacement information is a change in the tilt angle, and among the tilt angles acquired at a predetermined time interval, there were changes in which two consecutive tilt angles acquired successively exceeded the tilt angle used as a criterion. Sometimes, it is determined that an abnormality has occurred in the sidewall W. Specifically, it is when the change in the tilt angle exceeds 1 (°) and is 2 (°) or less, or when the change in the tilt angle exceeds 2 (°).

(3) A function for notifying each terminal device B of an abnormality when it is determined that the abnormality is determined by the abnormality determining means D2. This function is referred to as abnormality notification means D3. FIG. 4 is an explanatory diagram showing display contents on the display 2.
A hard disk (not shown) in the personal computer 3 stores a terminal arrangement table in which identification information of each terminal device B... Described later is associated with their installation position information.
In the present embodiment, assuming that the terminal devices B are arranged in four rows and three stages on the side wall (object) W, as shown in FIG. 4, each terminal device is based on the terminal arrangement table. The points B ′ indicating B are arranged on the display 2 in the same arrangement as the actual one.
That is, it has a function of converting the displacement information of the side wall (object) W transmitted from each terminal device B into a visual change and displaying it on the display 2.
In this embodiment, when no abnormality has occurred, all the points B ′ are displayed in blue, for example, and when an abnormality has occurred, the point B ′ corresponding to the terminal device B in which the abnormality has occurred is yellow or It is displayed in red.
In this case, “yellow” corresponds to the degree of abnormality, such as when the change in tilt angle is 2 (°) or less, and “red” is when the change in tilt angle exceeds 2 (°). In this way, it is possible to intuitively determine the degree of abnormality and the position where the abnormality occurs on the side wall W.
In addition, the position on the side wall W where the abnormality has occurred and the degree of abnormality may be notified by voice, and the same contents may be displayed on the display 2 by using a telop or the like.

(4) A function of shortening the transmission time interval of the transmission request transmitted from the transmission request unit D1 when it is determined to be abnormal by the abnormality determination unit D2 than before the determination. This function is called transmission time switching means D4.
Although the time interval shorter than that before the determination is set uniformly as, for example, once every two hours regardless of the degree of abnormality in the present embodiment, it may be set as follows.
・ Set multiple time intervals according to the degree of abnormality.
Specifically, when the change in the inclination angle exceeds 1 (°) and the change is 2 (°) or less, for example, once every two hours, when the change in the inclination angle exceeds 2 (°), You may do it once per hour.
To summarize this function, when the abnormality determination unit D2 determines that an abnormality has occurred, the transmission time interval of the transmission request transmitted from the transmission request unit D1 is made shorter according to the degree of abnormality than before the determination. It can be said that the function to do.

In this embodiment, the transmission time switching means D4 has the following functions.
When the following rainfall determination means D5 determines that the rainfall detected by the rainfall detection sensor 5 exceeds a certain reference value, or when the earthquake detection means D6 below determines the seismic intensity of the earthquake detected by the earthquake detection sensor 6 to be constant. A function of shortening the transmission time interval of the transmission request transmitted from the transmission request means D1 when it is determined that the reference value has been exceeded, compared to the time before the determination.

(5) A function for determining whether or not the rainfall detected by the rainfall detection sensor 5 exceeds a certain reference value. This is called rainfall determination means D5.
The “certain reference value” is, for example, a rainfall amount that has an adverse effect that accelerates a change in the inclination of the side wall W.

(6) A function for determining whether the seismic intensity of the earthquake detected by the earthquake detection sensor 6 exceeds a certain reference value. This is called earthquake determination means D6.
The “certain reference value” is a seismic intensity that exerts an adverse effect such as advancing the change in the inclination of the side wall W, for example.
In the present embodiment, the rain detection sensor 5 and the earthquake detection sensor 6 are provided on the main device D side, but they may be provided on some terminal devices or all terminal devices.

(7) A function for determining whether or not displacement information is transmitted from each terminal device B in response to a transmission request. This is referred to as transmission / reception determination means D7.
In this embodiment, when no displacement information is transmitted until a certain time has elapsed since the transmission request is transmitted, the displacement information is not transmitted from each terminal device B in response to the transmission request. Judgment.

(8) When the transmission / reception determination unit D7 determines that the displacement information is not transmitted from one terminal device, the other terminal device is requested to transmit maintenance information of the one terminal device. function. This function is called maintenance information request means D8.
The “maintenance request information” indicates that when transmission of displacement information from the terminal device B is interrupted, in other words, when the transmission / reception determination means D7 determines that displacement information is not transmitted from one terminal device, It is included in the packet data transmitted from the device D, and the contents thereof are as described above.

Next, the terminal device B will be described. FIG. 5 is a functional block diagram of the terminal device B.
As shown in FIG. 1, the terminal device B includes an inclinometer 10, a wireless unit 11, a processing unit 12 having a built-in memory, and a power source 13 such as a battery.
The inclinometer 10 is a bubble sensor made of, for example, a conductive liquid sealed in a tube and bubbles, and the movement of the bubbles due to the change in inclination changes the area covering the two left and right electrodes, causing a change in conductive resistance. The analog voltage is output through an amplifier that does not. This inclinometer 10 is an inclination detection sensor.

The processing unit 12 implements the following functions by executing a required program.
(1) A function for acquiring displacement information of the object W. Hereinafter, it is referred to as displacement information acquisition means 12a.
In this embodiment, the acquisition of the tilt angle (displacement information) by the displacement information acquisition means 12a is made in response to the transmission request from the transmission request means D1, but regardless of the transmission request. Instead, it may be acquired at regular time intervals.

(2) A function of converting the analog voltage output from the inclination detection sensor (inclinometer) 10 into an inclination angle. This function is called angle conversion means 12b.
In addition, each time the conversion means 12b does not necessarily need to be provided in the terminal device B, and may be configured to be provided in the main device D.

(3) A function of transmitting the acquired displacement information toward the main unit D at a predetermined time interval. Hereinafter, the displacement information transmission unit 12c is referred to.
In the present embodiment, the inclination angle of the side wall W is transmitted in response to the transmission request from the transmission request unit D1 of the main device D described above. In this case, as described above, the packet data including the inclination time and the acquisition time (acquisition time) at which the inclination angle is acquired and the identification information for identifying the terminal device B are transmitted.

The wireless unit 11 has an output that is small enough to reach another terminal device B adjacent to the wireless unit 11, thereby reducing consumption of the power supply 13 as much as possible.
Therefore, the terminal device B relays the displacement information transmitted from each terminal device B to the main device D and the transmission request transmitted from the main device D to each terminal device B, in addition to the above-described functions. It has a function. This function is called routing means 12d.
That is, when some abnormality occurs in another adjacent terminal device and the terminal device lacks a transmission / reception function, displacement information or the like is exchanged with the main body device via another terminal device other than the other terminal device. Is to send and receive. Thereby, even if an abnormality occurs in any of the terminal devices, it is possible to continue to transmit and receive displacement information between the other terminal devices and the main body device.

The relay device C has a function of relaying displacement information transmitted from each terminal device B to the main device D and a transmission request transmitted from the main device D to each terminal device B. The wireless unit 20, a processing unit 21 with a built-in memory, and a power source 22 such as a battery are provided.
The relay device C may be provided as necessary when some or all of the terminal devices B are not arranged in the transmission area of the wireless unit 4 of the main device D.

The operation of the displacement information acquisition system configured as described above is as follows. FIG. 6 is a flowchart showing the operating state of the system.
<Operation on the main unit>
Step 1 (abbreviated as S1 in the figure. The same applies hereinafter): Initial setting is performed. The initial setting is to initialize various settings of the main device D and the terminal device B.
Step 2: Self-diagnosis of the main device D, the relay device C, and each terminal device B is performed. If there is an abnormality, the process proceeds to step 3 to perform NG processing. If normal, the process proceeds to step 4.
Step 3: Perform NG processing. The content of this NG process is that the system is not operated.

Step 4: Set the transmission time interval of the transmission request. The transmission time interval is in a situation where the above-described abnormality does not occur on the side wall W, and as described above, for example, it is assumed to be twice a day, that is, about once every 12 hours.
Step 5: It is determined whether or not the rainfall detected by the rainfall detection sensor 5 exceeds a certain reference value, and if it is below the certain reference, the process proceeds to Step 6, and if it exceeds the reference value, the process proceeds to Step 7. .
Step 6: It is determined whether or not the seismic intensity detected by the earthquake detection sensor 6 exceeds a certain reference value. If the seismic intensity exceeds a certain reference value, the process proceeds to Step 8; move on.
Step 7: It is determined whether or not the change in the inclination angle of the side wall W exceeds a certain reference value. If it exceeds the certain reference value, the process proceeds to Step 8; .

Step 9: A request for transmission of displacement information is made to each terminal device B.
Step 10: The displacement information received from the terminal device B is stored.
Step 11: It is determined whether or not to end. If not, the process returns to Step 5, and if it ends, the process proceeds to Step 15. The determination as to whether or not to end is based on whether or not a preset work period has elapsed.

  Step 8: Set the transmission time interval of the transmission request when an abnormality has occurred. Specifically, as described above, when the change in the inclination angle exceeds 1 (°) and the change is 2 (°) or less, for example, once every 2 hours, the change in the inclination angle changes to 2 (°). When exceeding the change, the interval is once per hour.

Step 12: It is determined whether or not to cancel the setting of the transmission time interval when an abnormality has occurred. If so, the process returns to Step 5; otherwise, the process proceeds to Step 13.
Judgment whether or not to cancel the transmission time interval setting is when the change in the inclination angle after rainfall or after the earthquake occurs or when it falls below the preset value, etc. It can be.

Step 13: A request for transmission of displacement information or the like is made to each terminal device B.
Step 14: Store the displacement information received from each terminal device B... And return to Step 12.
Step 15: End processing is performed. The termination process includes turning off the power of the terminal devices B.

The present invention is not limited to the embodiment described above, and the following modifications can be made.
In the above-described embodiment, the configuration in which the time interval for acquiring the displacement information is shortened by determining that an abnormality has occurred has been described, but the acquisition of displacement information has been performed by determining that an abnormality has occurred. You may make it start.
That is, an information acquisition start unit that starts acquiring the displacement of each terminal device may be provided when the above-described abnormality determination unit determines that an abnormality has occurred.

It is a conceptual diagram of the displacement information acquisition system which concerns on one Embodiment of this invention. It is explanatory drawing which shows the content of packet data. It is a functional block diagram of a main unit. It is explanatory drawing which shows the display content of a display. It is a functional block diagram of a terminal device. It is a flowchart which shows the operation state of this system.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Identification information 1b Displacement information 1c Acquisition time 2 Display 5 Rain detection sensor 6 Earthquake detection sensor 10 Inclination detection sensor 12a Displacement information acquisition means 12c Displacement information transmission means B Terminal apparatus C Relay apparatus D Main body apparatus D1 Transmission request means D2 Abnormality determination means D3 Abnormality notification means D4 Transmission time switching means D5 Rain amount determination means D6 Earthquake determination means W Object

Claims (7)

A displacement information acquisition system in which a plurality of terminal devices that are arranged at predetermined positions of an object and acquire displacement information at each predetermined position and a main body device are connected via a wireless communication network,
Based on the displacement information transmitted from each terminal device, the main body device has an abnormality determining means for determining abnormality of the object, and when the abnormality determining means determines that there is an abnormality, the abnormality is detected for each terminal device. An abnormality notifying means for notifying, a transmission requesting means for making a transmission request for displacement information of the object to each terminal device at a predetermined time interval, and when the abnormality determining means determines that there is an abnormality, A transmission time switching means that shortens the transmission time interval than before the determination, a rain detection sensor that detects rainfall, and whether or not the rainfall detected by the rain detection sensor exceeds a certain reference value In response to the transmission request, the rainfall determination unit, the transmission / reception determination unit that determines whether or not displacement information is transmitted from each terminal device, and the transmission / reception determination unit from the one terminal device When the transmission of the position information is determined not to be made, to the other terminal devices, together with and a maintenance information requesting means are provided for requesting transmission of maintenance information for the one terminal device,
The terminal device transmits displacement information acquisition means for acquiring displacement information of the object, displacement information transmission means for transmitting the acquired displacement information toward the main body device at predetermined time intervals, and transmission toward the main body device. Displacement information, and routing means for relaying transmission requests transmitted from the main unit to each terminal device, respectively, are provided,
The displacement information transmission means is configured to transmit displacement information of the object in response to the transmission request when there is a transmission request from the transmission request means,
When the transmission time switching means determines that the rainfall has exceeded a certain reference value by the rain amount determination means, the transmission time interval of the displacement information is made shorter than before the determination ,
When the other terminal device receives the maintenance request information from the main device, the routing means transfers the maintenance request information to the one terminal device, and directs the maintenance report information of the one terminal device to the main device. displacement information acquiring system and transmits Te.   The displacement information acquisition system according to claim 1, wherein a transmission time interval of the displacement information is varied for each preset terminal device.   The displacement information acquisition system according to claim 1 or 2, wherein the transmission time switching means shortens the displacement information transmission time interval according to the degree of abnormality. The main unit is further provided with an earthquake detection sensor for detecting an earthquake, and a seismic intensity determination means for determining whether the seismic intensity detected by the earthquake detection sensor is equal to or greater than a certain reference value,
The transmission time switching means is characterized in that, when the seismic intensity determination means determines that the detected seismic intensity exceeds a certain reference value, the transmission time interval of the displacement information is made shorter than before the determination. Item 4. The displacement information acquisition system according to any one of Items 1 to 3.   5. A relay device for relaying displacement information transmitted from each terminal device toward the main device and a transmission request transmitted from the main device to each terminal device, respectively, is provided. The displacement information acquisition system according to any one of the above. The main unit is provided with a display,
6. The displacement information acquisition unit according to claim 1, wherein the abnormality notification unit converts the displacement information of the object transmitted from each terminal device into a visual change and displays the change on the display. system.   7. The displacement information according to any one of claims 1 to 6, wherein the displacement information transmitting means transmits the time data when the displacement information is acquired and identification information for identifying the terminal device together with the displacement information. Acquisition system.

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