JP2008214896A - Information carrier, and suction detection system and suction detection method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To rapidly and easily detect movement of soil under a road surface (or in the ground) caused by suction of back-filling soil from under a caisson to a seashore or the like in a bank, a revetment or the like. <P>SOLUTION: Using the suction detection system including at least one or more information carriers buried in the ground and a detector which wirelessly reads identification information of the information carriers inside and outside the ground, at least one or more information carriers are buried in the ground, transmission and receiving of information with the information carriers buried in the ground is performed by the detector in the system, and the moving state of each information carrier is acquired by comparative determination processing performed by a determination means of the detector. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a system and method for grasping the state of movement of soil in the ground where a cavity is generated in the ground. In particular, an information carrier using a wireless IC tag suitable for being buried in the ground in order to grasp the state of movement of soil in the ground as described above, and using this, the state of movement of soil in the ground can be determined. The present invention relates to a suction detection system and a suction detection method to be grasped.

  The embankment and revetment facing the coast, for example, are constructed in the order of the wave-dissipating block and the caisson from the coast or the like to the land side, and further, the backside soil is put on the land side of the caisson. On the backside of the caisson, the pavement may be paved.

  However, back-filled soil may be sucked out from under the caisson to the beach, etc. due to pressure fluctuations caused by the vertical movement of the water surface on the beach due to waves, tidal waves, etc. If a cavity is generated on the land side of the caisson due to such suction, there is a high possibility that it will lead to bank breakup. In addition, when the top of the backfill soil placed on the land side of the caisson is pavemented, etc. and formed on the road, if a cavity is generated on the land side of the caisson due to the suction as described above, the road surface below the road surface ( That is, a hollow is generated in the ground), and there is a high possibility that the road will collapse.

  Therefore, countermeasures such as covering with a sandproof sheet of backfill soil and solidification by adding chemicals are taken. However, even with these measures, it is not easy to prevent the phenomenon that the back soil is sucked out from the bottom of the caisson to the beach due to pressure fluctuations caused by the vertical movement of the water surface such as waves and tidal waves. Absent. For this reason, it is necessary to inspect the road surface in order to prevent the occurrence of road depression.

  Therefore, the inspection worker visually checks the presence or absence of dents and cracks on the road surface to check the outflow of the back soil and the occurrence of cavities. It is difficult. In addition, the discovery rate is low because visual inspection from the vehicle is almost necessary due to the necessity of wide area inspection. In addition, although it takes cost and labor to secure inspection workers, manual inspection is not uniform and nighttime inspection is difficult.

Therefore, an inspection method using a cavity exploration vehicle equipped with a ground penetrating radar device has been proposed in order to eliminate the above-described drawbacks (see, for example, Patent Document 1).
JP-A-5-87945

  According to the inspection method described in Patent Document 1 described above, it is possible to detect the occurrence of cavities by investigating and inspecting the situation under the road over a long distance (that is, underground) while traveling on the road. It is supposed to be.

  However, the cavity exploration vehicle is used for exploration under the road surface of the roadway (that is, underground), and for the exploration under the sidewalk, a hand-held cavity detector must be used. Exploration costs are high, and further, there is a problem that cavity exploration cannot be performed in real time because data processing after exploration requires a lot of time and labor.

  The present invention quickly and easily detects the movement of soil under the road surface (ie, underground) and the generation of cavities caused by backfill soil being sucked from the bottom of the caisson to the shore, etc. The purpose is to provide technology.

  To achieve the above object, the present invention is an information carrier embedded in the ground, comprising a polyhedral structure and at least one or more wireless IC tags attached to at least one surface of the polyhedral structure. The wireless IC tag proposes an information carrier characterized by including identification information for identifying each wireless IC tag.

  Here, the polyhedral structure may be a hexahedron, for example, a regular hexahedron.

  The suction detection system proposed by the present invention includes at least one information carrier embedded in the ground and a detection device that wirelessly reads identification information provided in the information carrier from outside the ground. The information carrier comprises any one of the information carriers of the present invention, and the detection device includes transmission / reception means and an antenna for transmitting / receiving various types of information to / from the information carrier, and identification information provided in the information carrier. An information carrier identification information recording means for recording the information carrier, and a judgment means for performing a comparison judgment between the identification information provided in the information carrier received by the transmission / reception means and the identification information recorded in the information carrier identification information recording means It is characterized by having.

  A suction detection method proposed by the present invention is performed using the suction detection system of the present invention, wherein at least one information carrier of the present invention is embedded in the ground, and the book Information is transmitted / received to / from the information carrier embedded in the ground by the detection device in the suction detection system of the invention, and the movement status of each information carrier is determined by the comparison determination process performed by the determination means of the detection device. By grasping, it is characterized by grasping the state of soil movement in the ground.

  As described above, the information carrier of the present invention includes a polyhedral structure and at least one or more wireless IC tags attached to at least one surface of the polyhedral structure, and the wireless IC tag includes each wireless IC tag. Identification information for identifying is provided. For example, at least one surface of each surface of a tetrahedron such as a triangular pyramid, at least one surface of each surface of a hexahedron such as a rectangular parallelepiped, and at least one surface of each surface of a regular hexahedron such as a cube, One wireless IC tag is provided. Each wireless IC tag includes identification information for identifying each wireless IC tag.

  If this information carrier is buried in the backfill soil placed on the land side of the caisson, such as on a dike or revetment, the road surface generated by the backfill soil being sucked out from under the caisson to the coast, etc. The information carrier also sinks, rotates, etc. according to the movement of the soil below (that is, in the ground) and the generation of a cavity. Therefore, identification information for identifying each wireless IC tag is attached to at least one surface of the polyhedral structure by a wireless IC tag reader (reader / writer) existing outside the ground, for example, on the ground. Based on fluctuations in the identification information read from the wireless IC tag provided, the movement state of the information carrier such as settling or rotation is grasped, and thereby the back soil is sucked out from under the caisson to the beach or the like. Therefore, it is possible to quickly and easily detect the movement of soil under the road surface (that is, the underground) and the generation of a cavity.

  It is buried in the backfill soil put on the land side of the caisson, and the movement of the soil under the road surface (that is, the underground) caused by sucking the backfill soil from the bottom of the caisson to the beach etc. When the information carrier settles, rotates, etc. according to the generation of the cavity, the information carrier settles and rotates due to fluctuations in the identification information read from the wireless IC tag attached to one surface of the polyhedron constituting the information carrier. The wireless IC tag needs to be attached to at least one surface of the polyhedron because it is used for grasping the movement state such as movement, and it is possible to suppress the generation of blind spots in reading identification information by the reading device and In order to grasp the more accurate movement status of each of the polyhedrons, each surface of the polyhedron is provided with at least one wireless IC tag (that is, identification information for identifying each wireless IC tag, respectively). It is desirable to form a line IC tag) has been deployed.

  The wireless IC tag includes a transmission / reception unit that transmits / receives various information to / from a wireless IC tag reader (reader / writer) like a conventionally known wireless IC tag. A power supply unit that supplies power to each part of the wireless IC tag from the induced current generated by the electromagnetic wave can be provided. In this way, electric power is generated by receiving electromagnetic waves transmitted from the wireless IC tag reader (reader / writer), and it is not necessary to provide a battery in the wireless IC tag, and it is not necessary to embed a power cable. .

  The suction detection method of the present invention, as described above, embeds one or more information carriers made of a polyhedral structure to which a wireless IC tag having recorded identification information is attached in the ground, and The above-mentioned identification information is read from the ground) by the detection device, and compared with the identification information recorded in advance on the information carrier recording means of the detection device, thereby changing the position of the information carrier, moving the information carrier, By detecting the change in the inclination of the information carrier, etc., it detects the movement of the soil in the ground, which causes the change in the position of the information carrier, the movement of the information carrier, the change in the inclination of the information carrier, etc. is there.

  For example, by embedding an information carrier consisting of a structure with a wireless IC tag attached at a predetermined interval in the embedded soil under the road formed on the upper surface of the embedded soil, In addition, it is possible to easily detect the position variation of the information carrier caused by the generation of the cavity. The number of information carriers to be embedded can be appropriately determined according to the depth of the back soil that may flow out. It is possible to easily and accurately detect the position variation due to the initial generation of cavities that are partially generated by embedding a plurality of them.

  According to the present invention, the movement of the soil under the road surface (that is, in the ground) caused by sucking the back soil from the bottom of the caisson to the shore or the like in a dike or a revetment can be quickly and easily performed. Can be detected.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 2, the information carrier 1 is embedded in the ground, and is a polyhedral structure 2 and at least one wireless IC tag attached to at least one surface of the polyhedral structure 2. It consists of three. In the illustrated embodiment, one wireless IC tag 3 is attached to each surface of a regular hexahedron, that is, a cube-shaped structure 2.

  The structure 2 has strength and corrosion resistance that do not deform even when buried in the ground, and can be made of, for example, a concrete block or a synthetic resin.

  In the illustrated embodiment, a flexible protective sheet 5 is attached to the surface of the regular hexahedron from above the wireless IC tag 3 so as to cover the wireless IC tag 3 from above. The protective sheet 5 protects the wireless IC tag 3 from damage caused by underground earth and stones, and may be any structure as long as the wireless IC tag covers the wireless IC tag as shown in FIG. It is not necessary to cover the entire surface of 2.

  As will be described later, the identification information recorded on each wireless IC tag 3 attached to the six surfaces of the structure 2 includes a code number for identifying the attached structure 2, and each wireless An ID number for identifying the IC tag 3 from the wireless IC tag 3 attached to the other surface of the same structure 2 is included. That is, in the example shown in FIG. 2, the wireless IC tag 3 attached to the right side in the figure, the wireless IC tag 3 attached to the front side in the figure, and attached to the upper side in the figure. Each wireless IC tag 3 includes a code number for identifying the structure 2 illustrated in FIG. 2 and an ID number assigned to each wireless IC tag 3 as identification information. In the figure, the ID number provided in the wireless IC tag 3 attached to the right side surface, in the figure, the ID number provided in the wireless IC tag 3 attached to the front side, The ID numbers provided to the wireless IC tags 3 attached to the side surfaces are different from each other, whereby each wireless IC tag 3 can be identified.

  Next, the identification information recorded on the wireless IC tag 3 attached to each surface of the information carrier 1 and the structure 2 constituting the information carrier 1 described in FIG. A suction detection system including a detection device 6 that wirelessly reads the image will be described with reference to the schematic configuration diagram of FIG.

  As shown in FIG. 1, among the six wireless IC tags 3 attached to the six surfaces of the structure 2, two wireless IC tags 3 a and 3 b and the detection device 6 are provided for the convenience of space. explain. The wireless IC tags 3a and 3b are identical in structure and have different ID numbers recorded. Accordingly, the same numbers are used for the components of the wireless IC tags 3a and 3b.

  The wireless IC tag 3a includes an antenna 11 that transmits and receives information wirelessly with the detection device 6, and an IC chip 12 that includes various circuits. In addition to transmitting and receiving information as data, the antenna 11 is a coil-shaped one that receives electromagnetic waves transmitted from the detection device 6 as will be described later, and generates power as a power source from current generated by electromagnetic induction. Can be used.

  In the illustrated embodiment, the IC chip 12 includes a transmission / reception circuit 13, a recording circuit 15, a power supply circuit 16, and a control circuit 17. The transmission / reception circuit 13 transmits / receives information to / from the detection device 6. The recording circuit 15 pastes the identification information of the wireless IC tag 3a (the code number for identifying the structure 2 to which the wireless IC tag 3a is attached and the wireless IC tag 3a on the other surface of the same structure 2. ID number for identifying the attached wireless IC tag 3). The power supply circuit 16 rectifies the induced current generated by electromagnetic induction from the electromagnetic wave received by the antenna 11 to generate power for power supply. The control circuit 17 controls these circuits.

  The detection device 6 serves as a wireless IC tag reading device (reader / writer). In the illustrated embodiment, the antenna 21, the transmission / reception means 22, the IC tag information recording means 23, the determination means 25, and the display means 26 are provided. The control means 27 is provided.

  The transmission / reception means 22 transmits / receives various information to / from the information carrier 1 via the antenna 21, that is, transmits / receives various information to / from the wireless IC tags 3a and 3b.

  The IC tag information recording means 23 identifies the identification information provided in the information carrier 1, that is, the identification information provided in each wireless IC tag 3a (to identify the structure 2 to which the wireless IC tag 3a is attached). The ID number for identifying the wireless IC tag 3a and the wireless IC tag 3 affixed to the other surface of the same structure 2) as an information carrier identification information recording means To fulfill.

  In the IC tag information recording means 23, when the identification information provided in each information carrier 1, for example, as will be described later, in carrying out the sucking detection method of the present invention, first, each information carrier 1 is put into the ground. The code number for identifying the structure 2 to which each wireless IC tag 3a, 3b attached to each information carrier 1 is attached and the same structure to each wireless IC tag 3a, 3b at the time of embedding 2 is recorded with an ID number for distinguishing it from the other wireless IC tag 3 attached to the other surface.

  The determination means 25 includes the identification information included in the information carrier 1 received by the transmission / reception means 22, that is, the identification information included in each wireless IC tag 3a (the structure 2 to which the wireless IC tag 3a is attached). A code number for identification, an ID number for identifying the wireless IC tag 3a from the wireless IC tag 3 attached to the other surface of the same structure 2, and information carrier identification information recording means (IC The information is compared with the identification information recorded in the tag information recording means 23).

  Information is transmitted between the information carrier 1 and the detection device 6, that is, between the wireless IC tags 3 a and 3 b and the detection device 6, via the antenna 11, the transmission / reception circuit 13, the antenna 21, and the transmission / reception means 22. When performing the above-described sucking detection method of the present invention, which is transmitted / received, received the identification information from each of the wireless IC tags 3a, 3b, and recorded in the IC tag information recording means 23, first Further, at the time when each information carrier 1 is buried in the ground, a code number for identifying the structure 2 to which each wireless IC tag 3a, 3b attached to each information carrier 1 is attached, and each wireless Each IC tag 3a, 3b is attached by comparing the IC tag 3a, 3b with an ID number for distinguishing the IC tag 3a, 3b from the other wireless IC tag 3 attached to the other surface of the same structure 2. Information 1, carrying out the suction detection method of the present invention described below, in which first, whether or not moved from the position in which buried the information carrier 1 in the ground, the determination is.

  The determination result made by the determination unit 25 in this way is displayed on the display unit 26.

  The control means 27 controls the processing operations described above performed by these means.

  The detection device 6 can be either in-vehicle type or portable type depending on the application.

  In addition to the liquid crystal display, the display means 26 may be printed on a paper surface.

  The detection device 6 described above includes an antenna 21, a flash memory as the IC tag information recording unit 23, a determination unit 25, a transmission / reception unit 22, and a CPU, RAM, ROM, and the like as the control unit 27. The functions of the respective means can be exhibited by operating the predetermined program.

  Next, an example of the embodiment of the suction detection method of the present invention, which is the operation of the suction detection system of the present invention, will be described with reference to FIGS.

  In carrying out the suction detection method of the present invention, first, the information carrier 1 is embedded in the backfill 33. For example, as shown in FIG. 4, a backfill 33 is constructed on the land side of the revetment 32 facing the coast 31, a vertical shaft 36 is excavated therein, and the vertical shaft 36 is used to In addition, a plurality (five in the illustrated example) of information carriers 1 are embedded at predetermined intervals in the vertical direction. Further, when constructing the backfill 33 on the land side of the revetment 32 facing the coast 31, as shown in FIG. 4, a plurality (five in the illustrated example) are spaced at predetermined intervals in the vertical direction. The information carrier 1 can also be embedded. A road or the like is formed on the constructed backfill 33. In the illustrated example, a road 35 paved with asphalt or the like is formed.

  Next, in the suction detection method of the present invention, the identification information recorded on the wireless IC tag 3 of the information carrier 1 buried in the ground as described above is read (S1).

  In the embedded state of FIG. 4, since five information carriers 1 are embedded in order from the bottom with a predetermined interval, each information carrier 1 when detected by the detection device 6 immediately after being embedded as identification information of the normal state. The identification information read from each is recorded in the IC tag information recording means 23 respectively.

  Next, as described above, information embedded in the ground using the detection device 6 at the time of a periodic inspection after a predetermined period of time has passed, or when there is heavy rain and an emergency inspection is performed. Between the carrier 1 and the detection device 6, that is, between the wireless IC tags 3 a and 3 b attached to each information carrier 1 and the detection device 6, the antenna 11, the transmission / reception circuit 13, the antenna 21, Information is transmitted / received via the transmission / reception means 22, identification information from each of the wireless IC tags 3a and 3b is received, and this is recorded in the IC tag information recording means 23 as described above. In carrying out the method, first, in order to identify the structure 2 to which each wireless IC tag 3a, 3b attached to each information carrier 1 is attached when each information carrier 1 is buried in the ground. of Over de number and compares each wireless IC tag 3a, the other radio IC tag 3 which is attached to the same other side of the structure 2 and 3b and ID number for identifying (S2).

  The identification information recorded on the wireless IC tag 3 attached to the information carrier 1 is the same as the code number for identifying the structure 2 to which each wireless IC tag 3 is attached and each wireless IC tag 3. The ID number for identifying with the other radio | wireless IC tag 3 affixed on the other surface of this structure 2 is included.

  As shown in FIG. 5, when the information carrier 1 flows out, moves, or rotates due to the backfill soil being sucked out and a cavity formed in the ground, the identification information read from outside the ground is IC In carrying out the suction detection method of the present invention recorded in the tag information recording means 23, each wireless IC attached to each information carrier 1 at the time when each information carrier 1 is first buried in the ground. A code number for identifying the structure 2 to which the tags 3a and 3b are attached, and the other wireless IC tag 3 in which the wireless IC tags 3a and 3b are attached to the other surface of the same structure 2 The result is different from the ID number for identification.

  Therefore, as shown in FIG. 5, it is possible to easily and accurately grasp that the back soil has been sucked out and discharged.

  As a result, when there is a difference between the identification information recorded in the IC tag information recording unit 23 in advance at the same point and the identification information received by detection, the determination unit 25 confirms according to a predetermined determination criterion. Cavity generation such as soil sucking out and outflow is determined (S3). This determination result is displayed on the display means 26 of the detection device 6.

  Judgment criteria are created based on experiments and past data, etc., depending on the degree of difference in the identification information to be compared, the degree of suction and outflow of the back soil, the situation, the initial stage of the cavity generation, the scale of the cavity generation, etc. Can be determined to be able to be determined.

  FIG. 5 is a cross-sectional view for explaining an example of a state in which the cavity 37 is generated by sucking out and outflow of the back soil. An example of the situation where the backfill soil 33 is sucked out to the shore due to pressure fluctuations caused by rising and falling of the sea level 38 caused by tidal fluctuations and sea conditions, and as a result, the cavity 37 is generated in the ground. Explain.

  Since the backfill 33 is sucked out to the shore side and the cavity 37 is generated, a plurality of information carriers 1 embedded in the backfill 33 flow out or move as shown in FIG. . Therefore, in this state, the identification information received by reading the wireless IC tag 3 by the detection device 6 from outside the ground is the identification information recorded in the IC tag information recording means 23 as the identification information of the normal state in the embedded state of FIG. It becomes different from information.

  Therefore, by using this, the determination means 25 can determine the generation of cavities such as sucking out and outflow of back soil.

  4, the identification information can be acquired from the information carrier 1 as shown in FIG. 6A. However, when the back soil is sucked out and discharged as shown in FIG. 5, the information carrier 1 Rotates as shown in FIG. Thus, in the normal state shown in FIG. 6A (embedded state in FIG. 4), as shown in FIG. 5, a state in which the backfill soil is sucked out and outflowed (for example, FIG. 6B ) In the illustrated state), the wireless ID tag 3 to be read is different, so that it is possible to determine the difference in the identification number and grasp the movement state, outflow state, etc. of the back soil.

  In order to make the determination accurate, reading by the detection device 6 is normally performed at a plurality of points, and the identification information recorded in the IC tag information recording unit 23 is also recorded in normal times as the identification information at normal times recorded in advance at the corresponding plurality of points. It is recorded (S4). For example, in addition to the road surface (upper side in FIG. 4), measurement and detection from the sea side (left side in FIG. 4) are also performed.

  As described above, one or more identification carriers 1 each having a polyhedral structure with the wireless IC tag 3 attached to at least one surface are buried in the ground, and the identification information recorded on the wireless IC tag 3 is read and its fluctuations are read. Therefore, it is possible to detect the underground fluctuation, that is, the movement state of the backfill, the suction, the outflow state, and the generation of cavities, so that more objective data can be obtained compared to the detection of the cavities generated manually. It can also be detected at night, and the detection device can be used as required, such as in-vehicle or portable.

  In addition, when a GPS measurement device is used in combination with the detection device and the information carrier is embedded, that is, the identification information acquisition position at the normal time is recorded in association with each other, and the GPS measurement device is also used at the time of detection, the identification information at the same position Can be easily obtained.

  Furthermore, the wireless IC tag generates an induced current by the received electromagnetic wave and uses this as electric power. However, the IC tag may be provided with a battery and constantly transmit identification information every predetermined time. Further, a pressure sensor, a temperature sensor or the like may be installed on the information carrier, and data measured by these sensors may be transmitted from the wireless IC tag. Further, a reader that receives the transmission data may be installed on site to generate an alarm or the like.

The figure explaining schematic structure of an example of the suction | inhalation detection system of this invention. The perspective view explaining an example of the information carrier of the present invention. The flowchart explaining the outline of an example of the suction detection method of this invention. Sectional drawing explaining an example of the state which embeds two or more information carriers of this invention in backfill soil in enforcing the suction | inhalation detection method of this invention. Sectional drawing explaining an example at the time of situations, such as sucking out of a backfill soil, outflow, etc. to the backfill soil in which the information carrier of this invention was embed | buried like FIG. (A) The figure explaining the identification information reading state in the state by which the information carrier of this invention is embed | buried like FIG. 4, (b) An example of the identification information reading state in the case shown in FIG. To do.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Information carrier 2 Structure 3, 3a, 3b Wireless IC tag 6 Detection apparatus 11 Antenna 12 IC chip 13 Transmission / reception circuit 15 Recording circuit 16 Power supply circuit 17 Control circuit 21 Antenna 22 Transmission / reception means 23 IC tag information recording means 25 Determination means 26 Display means 27 Control means

Claims (4)

  An information carrier embedded in the ground, comprising a polyhedron structure and at least one or more wireless IC tags attached to at least one surface of the polyhedron structure. An information carrier comprising identification information for identification.   The information carrier according to claim 1, wherein the polyhedral structure is a hexahedron. A suction detection system comprising at least one information carrier embedded in the ground and a detection device that wirelessly reads identification information provided in the information carrier from outside the ground,
The information carrier comprises the information carrier according to claim 1 or 2,
The detection apparatus includes: a transmission / reception unit and an antenna for transmitting / receiving various types of information to / from the information carrier; an information carrier identification information recording unit for recording identification information included in the information carrier; and the information carrier received by the transmission / reception unit A sucking detection system comprising: a determination unit that performs a comparison determination between the identification information included in the information carrier and the identification information recorded in the information carrier identification information recording unit. A suction detection method performed using the suction detection system according to claim 3,
At least one information carrier according to claim 1 or 2 is buried in the ground,
By transmitting and receiving information to and from the information carrier embedded in the ground by the detection device, by grasping the movement status of each information carrier by the comparison determination process performed by the determination unit of the detection device, A sucking detection method characterized by grasping the movement state of soil in the ground.

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