JP2012112982A - Buried object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a low cost buried object that can easily detect a condition of a structure and surely transmit the detection result.SOLUTION: A reinforcement cage Sincludes a detector 3 to detect a condition of a detection target object. The detector 3 can be connected with a wireless tag 4 via a signal line 5. When the detection target object is a reinforcement S, the detector 3 detects a condition of the reinforcement S. The detector 3 is fixed to the reinforcement Sbeforehand when the reinforcement cage Sis assembled in a factory, and carried in a construction site in a state where the detector 3 is fixed to the reinforcement S. The detector 3 is buried in concrete Cin a state where the detector 3 is connected with the wireless tag 4 via the signal line 5. For example, the detector 3 is fixed to a position in which damage tends to be concentrated in the reinforcement Swithin a depth H (=1.5D) from a bottom of a footing B, where D is an outer diameter of a pile foundation B.

Description

  The present invention relates to an embedded object including a detection device that detects a state of a detection target portion.

  Conventionally, inspecting cracks due to deterioration of structures such as concrete, there are regular visual inspections where visible, and non-destructive inspection using ultrasonic, which is expensive equipment, where visible. ing. For this reason, instead of expensive non-destructive inspection using ultrasonic waves, a structure damage detection apparatus using a wireless tag has been proposed.

  A conventional state detection device for a structure includes an RF analog circuit for modulating / demodulating an electromagnetic wave signal and generating a DC power supply, a logic circuit for controlling chip operation, a strain sensor circuit for measuring distortion, and an output signal of the strain sensor circuit A single crystal silicon substrate on which an electronic circuit including an amplifier circuit is formed, and a power supply circuit that generates electric power by electromagnetic waves irradiated from the outside and supplies electric power to the electronic circuit (for example, Patent Documents) 1). In such a conventional structure state detection device, a MEMS (Micro Electro Mechanical Systems) technology in which a strain sensor is integrated with other circuits on a substrate is used, and connection with a lead wire is not required, Measurement is possible without contact.

JP 2006-029931 A

  In such a conventional structure state detection apparatus, the structure is simplified because the strain sensor circuit and the RF analog circuit are integrated. However, in the conventional structure state detection device, it is necessary to install it at a location where distortion is measured.When the measurement location is a buried portion of a structure such as concrete or a buried portion of an underground structure, the measurement result is displayed. There is a problem that the RF analog circuit cannot be transmitted to the outside.

  An object of the present invention is to provide an embedded object that can detect the state of a structure easily and inexpensively and can reliably transmit the detection result.

The present invention solves the above-mentioned problems by the solving means described below.
In addition, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this embodiment.
As shown in FIG. 25, the invention of claim 1 is an embedded object including a detection device (3) that detects the state of the detection target portion (S ₁ , C ₁ ), and the detection device includes a pile foundation ( B ₄₎ detects the state of the reinforcing bar (S ₁₎ of a connectable through this sending the state of the reinforcing steel pile foundation wireless tag (4) to the signal line (5), the outer diameter of the pile foundation D The embedded object (S ₂ ) is characterized in that it is fixed to a reinforcing bar having a depth of H = 1.5D from the lower surface of the footing (B ₃ ).

  The invention according to claim 2 is the embedded object according to claim 1, wherein the detection device detects distortion of a reinforcing bar of the pile foundation.

  According to a third aspect of the present invention, in the buried object according to the second aspect, the detection device includes a strain gauge (3a) whose electrical resistance changes according to the strain of the reinforcing bar of the pile foundation. It is a thing.

  According to the present invention, the state of the structure can be detected inexpensively and easily, and the detection result can be reliably transmitted.

It is a schematic diagram which shows roughly the use condition of the state detection system of the structure which concerns on 1st Embodiment of this invention. 1 is a block diagram of a structure state detection system according to a first embodiment of the present invention. It is a block diagram of the state detection apparatus of the state detection system of the structure which concerns on 1st Embodiment of this invention. It is a block diagram which shows roughly the installation state of the state detection apparatus of the structure state detection system which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows roughly the data structure of the memory | storage part by the side of the reader / writer apparatus in the state detection system of the structure concerning 1st Embodiment of this invention. It is a schematic diagram which shows roughly the data structure of the memory | storage part by the side of the evaluation apparatus of the structure state detection system which concerns on 1st Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the wireless tag of the state detection system of the structure which concerns on 1st Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the reader / writer apparatus of the state detection system of the structure which concerns on 1st Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the evaluation apparatus of the structure state detection system which concerns on 1st Embodiment of this invention. It is a block diagram of the state detection system of the structure concerning 2nd Embodiment of this invention. It is a block diagram of the state detection apparatus of the state detection system of the structure which concerns on 2nd Embodiment of this invention. It is a schematic diagram which shows schematically the data structure of the memory | storage part by the side of the reader / writer apparatus in the state detection system of the structure concerning 2nd Embodiment of this invention. It is a schematic diagram which shows roughly the data structure of the memory | storage part by the side of the evaluation apparatus of the structure state detection system which concerns on 2nd Embodiment of this invention. It is a block diagram of the state detection system which concerns on 3rd Embodiment of this invention. It is a schematic diagram which shows roughly the data structure of the memory | storage part by the side of the wireless tag of the state detection system of the structure which concerns on 3rd Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the radio | wireless tag of the state detection system of the structure which concerns on 3rd Embodiment of this invention. It is a block diagram of the state detection system of the structure concerning 4th Embodiment of this invention. It is a block diagram of the state detection apparatus of the state detection system of the structure which concerns on 4th Embodiment of this invention. It is a flowchart for demonstrating operation | movement of the radio | wireless tag of the state detection system of the structure which concerns on 4th Embodiment of this invention. It is a schematic diagram which shows roughly the use condition of the state detection system of the structure which concerns on 5th Embodiment of this invention. It is a conceptual diagram for demonstrating the installation method of the state detection apparatus of the state detection system of the structure which concerns on 5th Embodiment of this invention, (A)-(F) is an outline of the procedure from construction start to construction completion. FIG. It is a schematic diagram which shows roughly the use condition of the state detection apparatus of the state detection system of the structure which concerns on 6th Embodiment of this invention, (A) is a schematic diagram which shows the state installed in the pillar base part of a bridge (B) is a schematic diagram which shows the state installed in the abutment base of the bridge. It is a schematic diagram which shows roughly the use condition of the state detection apparatus of the state detection system of the structure which concerns on 7th Embodiment of this invention, (A) is a cross-sectional view, (B) is a longitudinal cross-sectional view. is there. It is a schematic diagram for demonstrating the detection operation of the crack by the state detection apparatus of the state detection system of the structure which concerns on 7th Embodiment of this invention, (A) is a cross-sectional view which shows the initial stage in which the crack generate | occur | produced (B) is a cross-sectional view showing a state in which a crack has developed. It is a schematic diagram which shows schematically the embedded object detected by the state detection system of the structure which concerns on 8th Embodiment of this invention, (A) is an external view which shows the state of the embedded object before installation, ( B) is an external view showing the state of the buried object after installation.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic diagram schematically showing a use state of the structure state detection system according to the first embodiment of the present invention.
A structure B shown in FIG. 1 is a detection object whose state is detected by the state detection system 1, and is a bridge or the like that secures a space below the track R on which the vehicle V travels and supports the train load. It is a fixed structure. The structure B is a viaduct that continuously elevates the track R with a bridge structure in a certain section such as an urban railway or a bullet train, for example, in order to three-dimensionalize road traffic in an urban area or the like. The structure B shown in FIG. 1 is a concrete structure such as a ramen viaduct mainly composed of a reinforced concrete structure (RC structure), such as a girder B ₁ , a column B ₂ , a footing B _3, and a pile foundation B _4. Etc. The ground G is the ground that supports the foundation of the structure B.

The girder B ₁ is a part that supports the track R and functions as a roadbed (base), and is a PC girder constructed by cast-in-place concrete and arranged in the horizontal direction. The column B ₂ is a portion that supports the beam B ₁ , and is a pier such as a reinforced concrete column that is constructed with cast-in-place concrete at a predetermined interval and arranged in the vertical direction. The footing B ₃ is a portion that receives a load from the column B ₂ and is a plate-like structure constructed by cast-in-place concrete. Footing B ₃ transfers the load from the column B ₂ is connected to the pile head of the pile foundation B ₄ in pile foundation B _4. The pile foundation B ₄ is a foundation part for supporting the structure B, and transmits the load from the footing B ₃ to the ground G. The pile foundation B ₄ is, for example, a cast-in-place concrete pile constructed by inserting a reinforcing bar into a hole having a predetermined depth excavated by an excavating machine and driving concrete.

Concrete C ₁ is a member in which aggregates such as sand, gravel and crushed stone, hydraulic cement and water are blended at an appropriate ratio, and these are kneaded and integrally hardened. Rebar S ₁ is a steel for reinforcing the concrete C ₁ embedded in the concrete C _1. Rebar S ₁ in cross section deformed steel bars (deformed bars) or circular cross-section of steel bar (round steel) and the like. Reinforcing bar S ₁ shown in FIG. 1 is a deformed reinforcing bar in which protrusions such as ribs or nodes are formed on the outer peripheral surface with a predetermined interval in the length direction in order to improve adhesion to concrete C ₁ .

  The track R is a passage (track) on which the vehicle V travels. The vehicle V is a railway vehicle such as a train or a train that travels on the structure B along the track R. The user M is an operator who monitors, maintains, or inspects the structure B.

FIG. 2 is a block diagram of the structure state detection system according to the first embodiment of the present invention. FIG. 3 is a block diagram of the state detection apparatus of the structure state detection system according to the first embodiment of the present invention. FIG. 4 is a block diagram schematically showing an installation state of the state detection device of the structure state detection system according to the first embodiment of the present invention.
The state detection system 1 shown in FIGS. 1 and 2 is a system that detects the state of the structure B. As shown in FIG. 2, the state detection device 2, the reader / writer device 6, the evaluation device 7, and the communication device. 8 and so on. The state detection system 1 detects the state of the structure B by the state detection device 2, receives the detection result of the state detection device 2 by the reader / writer device 6, analyzes the detection result by the evaluation device 7, and analyzes the structure. Evaluate the state of B.

The state detection device 2 is a device that detects the state of the structure B, and includes a detection device 3, a wireless tag 4, a signal line 5, and the like as shown in FIGS. The state detection device 2 detects the state of the structure B by the detection device 3, and transmits the detection result of the detection device 3 to the reader / writer device 6 shown in FIG. For example, in the case of the ramen viaduct in which the four right and left (total 8) pillars B ₂ support the girders B ₁ are usually used, the state detection device 2 has four pillars B at both ends that are easily damaged when an earthquake occurs. ₂ is preferable.

The detection device 3 is a device that detects the state of the structure B in an embedded state, and detects the state of the reinforcing bar S ₁ of the structure B as shown in FIGS. 3 and 4. As shown in FIG. 4, a plurality of detection devices 3 are arranged along the length direction of the reinforcing bar S ₁ so that the detection sensitivity direction coincides with the length direction of the reinforcing bar S ₁ . As shown in FIG. 1, the detection device 3 shown in FIG. 2 is installed on the pillar B ₂ of the structure B, and detects the distortion of the structure B. For example, a plurality of detection devices 3 are arranged side by side on both sides or one side of the reinforcing bar S ₁ along the length direction of the reinforcing bar S ₁ so that the bending of the reinforcing bar S ₁ can be detected. The detection device 3 is covered with a coating material such as a synthetic resin having weather resistance in order to ensure a long life without being corroded by alkali or acid of cement. As shown in FIGS. 2 and 3, the detection device 3 includes a strain gauge 3 a whose electrical resistance changes according to the strain of the structure B. As shown in FIG. 3, the strain gauge 3 a includes a thin plate-like insulating substrate (base) 3 b that is fixed to the outer peripheral portion of the reinforcing bar S _{1 with} an adhesive or the like before placing the concrete C ₁ , and this insulating property. A metal resistance wire 3c fixed to the substrate 3b with an adhesive or the like, and lead wires 3d connected to both ends of the metal resistance wire 3c are provided. Strain gauge 3a, as the metal resistance wire 3c is stretchable electrical resistance value changes according to the expansion and contraction of the reinforcing bar S _1, the length direction of the metal resistance wire 3c (detection sensitivity direction) length of the reinforcing bar S ₁ Arranged to match the direction.

The wireless tag 4 shown in FIGS. 2 and 3 is a device that transmits the detection result of the detection device 3 in an embedded state. The wireless tag 4 is, for example, a wireless IC tag, an ID tag, an RFID (Radio Frequency Identification), an RF tag, an electronic tag, and the like. As shown in FIGS. 2 and 3, the antenna unit 4a, the control unit 4b, and the storage A portion 4c, an interface portion 4d, a covering portion 4e, and the like are provided. The wireless tag 4 illustrated in FIGS. 2 and 3 is a passive tag that does not include a battery that serves as a power source and operates using power supplied from the reader / writer device 6 side as a power source. As shown in FIGS. 3 and 4, the wireless tag 4 is embedded in the cover concrete from the surface of the concrete C _{1 to} the surface of the rebar S ₁ , and this cover concrete usually has a thickness of about 30 to 50 mm. Is formed. The wireless tag 4 is normally embedded at a depth of, for example, about 10 cm from the surface of the concrete C ₁ so that radio waves can propagate through the concrete C ₁ and communicate with the outside in an embedded state. For example, the radio tag 4 is fixed by being bonded or tied to the surface of the reinforcing bar S ₁ before placing the concrete C ₁ . The wireless tag 4 is embedded in a state where it is exposed from the surface of the concrete C ₁ when the concrete C ₁ is placed in a state where the wireless tag 4 is attached to the formwork, and an inclusion is sandwiched between the formwork and fixed. When the concrete C ₁ is placed in such a state, the concrete C ₁ is buried in the concrete C ₁ . At the place where the wireless tag 4 is installed, an index is displayed on the surface of the structure B as a guide when the user M communicates from the outside using the reader / writer device 6 shown in FIG.

  The antenna unit 4a illustrated in FIGS. 2 and 3 is a part that transmits the detection result of the detection device 3, and supplies the induced electromotive force generated by the radio wave received from the outside to the detection device 3. As shown in FIG. 2, the antenna unit 4a can communicate with the antenna unit 6a on the reader / writer device 6 side. Electric power is supplied to the antenna line from the reader / writer device 6 side by the electromagnetic induction action between the antenna part 4a and the antenna line of the antenna part 6a shown in FIG.

  2 and 3 is a part that controls various operations on the wireless tag 4 side. The control unit 4b functions as a transmission / reception control unit that transmits and receives information, and operates using power supplied from the antenna unit 4a as a power source. The control unit 4b executes a series of processes in accordance with a control program that controls various operations of the wireless tag 4. For example, the control unit 4b transmits the unique ID information read from the storage unit 4c to the reader / writer device 6 from the antenna unit 4a, or measures the resistance value of the strain gauge 3a and uses the measurement result as detection result information. 4a is transmitted to the reader / writer device 6. The control unit 4b is connected so as to be able to communicate with the antenna unit 4a, the storage unit 4c, and the interface unit 4d.

The storage unit 4c is a part that stores various information. The storage unit 4c stores various information related to the structure B, and stores a control program that causes the control unit 4b to perform various operations on the wireless tag 4 side. The storage unit 4c stores an identification number for specifying the installation location of each detection device 3 as unique ID information, and constitutes a large scale integrated circuit (LSI) IC chip together with the control unit 4b. Storage unit 4c, for example, as in the middle portion of the up-line side from the line A - B station C th column B ₂ in the height direction, and stores the unique ID information for identifying the installation location of the detection device 3 ing.

  The interface unit 4 d is a part that inputs and outputs various information between the detection device 3 and the wireless tag 4. The interface unit 4d is an interface (I / O) circuit that connects the detection device 3 and the control unit 4b and inputs / outputs various information between them, and amplifies the output signal (electric signal) to the detection device 3. An amplification circuit and an A / D conversion circuit that converts an electric signal (analog signal) output from the amplification circuit into a digital signal are provided.

  3 is a part that covers the antenna unit 4a, the control unit 4b, the storage unit 4c, and the interface unit 4d. The covering portion 4e is insulated by a dielectric material such as glass or plastic, and the antenna portion 4a and the control portion are coated with a coating material such as a synthetic resin having weather resistance in order to prevent erosion due to alkali or acid of cement. 4b, the storage unit 4c, the interface unit 4d, and the like are covered and protected.

A signal line 5 shown in FIGS. 2 to 4 is a part for connecting the detection device 3 and the wireless tag 4. Signal line 5 is such as lead lines wired thereto electrically connected to and the concrete C ₁ such that a current flows between the detecting device 3 and the interface section 4d. One end of the signal line 5 is connected to the lead wire 3d of the strain gauge 3a, and the other end is connected to the interface unit 4d. Similarly to the detection device 3 and the wireless tag 4, the signal line 5 is covered and protected by a covering material.

  The reader / writer device 6 shown in FIG. 2 is a device that performs wireless communication with the wireless tag 4 and receives the detection result of the detection device 3 from the wireless tag 4. The reader / writer device 6 reads the unique ID information and the detection result information from the wireless tag 4 and transmits a radio wave (electromagnetic wave) to the wireless tag 4 to generate an induced electromotive force in the antenna unit 4 a of the wireless tag 4. As shown in FIG. 2, the reader / writer device 6 includes an antenna unit 6a, an input unit 6b, a storage unit 6c, a power supply unit 6d, an interface unit 6e, a display unit 6f, a control unit 6g, and the like. Yes.

  The antenna unit 6 a is a part that receives the detection result of the detection device 3. The antenna unit 6a can communicate with the antenna unit 4a on the wireless tag 4 side. The antenna unit 6a receives a unique ID information and detection result information transmission request to the antenna unit 4a together with a carrier wave, and receives the carrier wave from the antenna unit 4a and extracts the unique ID information and detection result information. The antenna line etc. which can communicate between a demodulator and the antenna line by the side of the antenna part 6a are provided.

  The input unit 6 b is a part for inputting various information to the reader / writer device 6. The input unit 6b is an input device that is operated by the user M when, for example, instructing the wireless tag 4 to transmit a unique ID information transmission request or a detection result information transmission request. The input unit 6b outputs information input by the user M to the control unit 6g. The input unit 6b is, for example, a touch panel switch for the user M to select an arbitrary operation item.

FIG. 5 is a schematic diagram schematically showing the data structure of the storage unit on the reader / writer device side in the structure state detection system according to the first embodiment of the present invention.
The storage unit 6c shown in FIG. 2 is a part that stores various information. The storage unit 6c stores detection result information for each detection device 3, and stores a control program that causes the control unit 6g to execute various operations on the reader / writer device 6 side. The storage unit 6c is, for example, a memory that stores unique ID information and detection result information received from the wireless tag 4 side. For example, as shown in FIG. 5, the storage unit 6 c stores unique ID information I ₁ ,..., I _N of each detection device 3 and relates to the date and time when each detection device 3 performs a detection operation. Detection time information D ₁₁ ,..., DN ₁ , resistance value information R _{11 ,.}

  The power supply unit 6 d shown in FIG. 2 is a part that supplies power to the reader / writer device 6. The power supply unit 6d is, for example, a detachable battery that is detachably attached to the reader / writer device 6, and starts supplying power to the reader / writer device 6 when the user M turns on a power switch (not shown). .

  The interface unit 6e is a part for inputting and outputting various information between the reader / writer device 6 and an external device. The interface unit 6e is an interface (I / O) circuit that connects an external device such as a computer or various controllers and the reader / writer device 6 and inputs / outputs various information between them.

  The display unit 6f is a part that displays various information. The display unit 6f displays, for example, the unique ID information and the detection result information input from the interface unit 7a on the screen, and displays the operation items selected by the user M by the input unit 6b on the screen. Device.

  The controller 6g is a part that controls various operations on the reader / writer device 6 side. The control unit 6g executes a series of processes in accordance with a control program that controls the operation of the reader / writer device 6. For example, the control unit 6g stores the unique ID information and the detection result received by the antenna unit 4a in the storage unit 6c, or reads the unique ID information and the detection result information from the storage unit 6c and outputs them from the interface unit 6e. . The control unit 6g is connected to be able to communicate with the antenna unit 6a, the input unit 6b, the storage unit 6c, the power supply unit 6d, the interface unit 6e, and the display unit 6f.

  The evaluation device 7 is a device that evaluates the detection result of the detection device 3. The evaluation device 7 evaluates the damage state of the structure B based on the detection result information read from the wireless tag 4 by the reader / writer device 6. The evaluation device 7 is configured by, for example, a personal computer and executes predetermined processing according to an evaluation program for evaluating the state of the structure B. As shown in FIG. 2, the evaluation device 7 includes an interface unit 7a, an input unit 7b, a storage unit 7c, an evaluation unit 7d, a display unit 7e, a control unit 7f, and the like.

  The interface unit 7a is a part for inputting and outputting various information between the evaluation device 7 and an external device. The interface unit 7a is an interface (I / O) circuit that connects the reader / writer device 6 and the evaluation device 7 and inputs / outputs various information between them. For example, the interface unit 7 a causes the evaluation device 7 to input unique ID information and detection result information stored in the storage unit 6 c of the reader / writer device 6.

  The input unit 7 b is a part for inputting various information to the evaluation device 7. The input unit 7b is, for example, an input device such as a keyboard operated by the user M when instructing the reader / writer device 6 to send a transmission request for unique ID information or a transmission request for detection result information. The input unit 7b outputs various information input by the user M to the control unit 7f.

FIG. 6 is a schematic diagram schematically showing the data structure of the storage unit on the evaluation device side of the structural state detection system according to the first embodiment of the present invention.
The storage unit 7c is a part that stores various information. The storage unit 7c is, for example, a memory that stores unique ID information and detection result information input from the reader / writer device 6. The storage unit 7c stores detection result information for each detection device 3 as a detection result history from the past to the present. Storage unit 7c are, for example, as shown in FIG. 6, the unique ID information I _1, ..., detection time information D ₁₁ for each I _N, ..., D _1n and the resistance value information R _11, ..., detects the R _1n The result information is stored in chronological order.

The evaluation unit 7d illustrated in FIG. 2 is a part that evaluates the damage state of the structure B based on the detection result of the detection device 3. The evaluation unit 7d measures the resistance value of the strain gauge 3a according to the evaluation program, and evaluates the damage state of the structure B based on the measurement result. As shown in FIG. 6, the evaluation unit 7d calculates the strain of the reinforcing bar S ₁ based on the resistance value information R ₁₁ ,..., R _1n of the strain gauge 3a from the past to the present, and based on the calculation result. Then, the damage state of the reinforcing bar S ₁ is evaluated. Evaluation unit 7d evaluates the distortion is a predetermined dangerous state rebar S ₁ proceeds damage state of the reinforcing bar S ₁ when the threshold is exceeded. The evaluation unit 7d evaluates the damage state of the reinforcing bar S ₁ of the structure B at multiple levels to assess whether this construct B is in an abnormal condition. For example, the evaluation unit 7d may damage state of the reinforcing bar S ₁ of the structure B Safety (level A), a rating is divided into three stages of attention (Level B) and risk (level C). The evaluation unit 7d evaluates that the structure B is in a damaged state when the resistance value of the strain gauge 3a gradually changes and exceeds a predetermined threshold value. Furthermore, when the resistance value of the strain gauge 3a becomes infinite and the evaluation unit 7d changes from the energized state to the non-energized state, the crack of the structure B progresses and the strain gauge 3a enters the cut state. Assess that is extremely dangerous. The evaluation unit 7d outputs these evaluation results as evaluation result information to the control unit 7f.

  The display unit 7 e is a part that displays various information on the evaluation device 7. The display unit 7e displays, for example, the evaluation result of the evaluation unit 7d on the screen, displays a warning for informing the user M of the damage state of the structure B, or reads from the wireless tag 4 The display device displays unique ID information and detection result information on a screen.

  The controller 7f is a part that controls various operations on the evaluation device 7 side. For example, the control unit 7f stores the unique ID information and the detection result information input from the interface unit 7a in the storage unit 7c, causes the evaluation unit 7d to evaluate the detection result of the detection device 3, and evaluates the evaluation result of the evaluation unit 7d. Is stored in the storage unit 7c, or the unique ID information, the detection result information, and the evaluation result information stored in the storage unit 7c are displayed on the display unit 7e. The control unit 7f is connected to be able to communicate with the interface unit 7a, the input unit 7b, the storage unit 7c, the evaluation unit 7d, and the display unit 7e.

  The communication device 8 is a device that connects the reader / writer device 6 and the evaluation device 7 so that they can communicate with each other. The communication device 8 is, for example, a signal line or an electric communication line that connects the interface unit 6e on the reader / writer device 6 side and the interface unit 7a on the evaluation device 7 side.

Next, the operation of the wireless tag of the structure state detection system according to the first embodiment of the present invention will be described.
FIG. 7 is a flowchart for explaining the operation of the wireless tag of the structure state detection system according to the first embodiment of the present invention.
In step (hereinafter referred to as S) 100 shown in FIG. 7, the wireless tag 4 receives a transmission request from the reader / writer device 6. When the user M operates the input unit 6b of the reader / writer device 6 shown in FIG. 1 to select a transmission request, electromagnetic waves are transmitted from the antenna unit 6a of the reader / writer device 6 shown in FIG. 2 to the antenna unit 4a of the wireless tag 4. Is transmitted, and the antenna unit 4a of the wireless tag 4 receives this electromagnetic wave.

  In S110, the wireless tag 4 is activated. When the antenna unit 4a of the wireless tag 4 receives a radio wave transmitted by the antenna unit 6a of the reader / writer device 6, power is supplied to the antenna unit 4a and the wireless tag 4 starts to be activated. As a result, the control unit 4b reads out the control program from the storage unit 4c, and executes a series of processes according to the control program.

  In S120, the control unit 4b determines whether or not a transmission request for unique ID information has been received. When the control unit 4b determines that the transmission of the unique ID information is requested from the radio wave received by the antenna unit 4a, the process proceeds to S130, and the control is performed if the transmission of the unique ID information is not requested from the radio wave received by the antenna unit 4a. When the unit 4b determines, the series of operations is terminated.

  In S130, the antenna unit 4a transmits the unique ID information to the antenna unit 6a. The control unit 4b reads the unique ID information from the storage unit 4c, and the antenna unit 4a transmits the unique ID information to the antenna unit 6a.

  In S140, the control unit 4b determines whether a detection result information transmission request is received from the reader / writer device 6. When the control unit 4b determines that transmission of detection result information is requested from the radio wave received by the antenna unit 4a, the process proceeds to S150, and control is performed if transmission of detection result information is not requested from the radio wave received by the antenna unit 4a. When the unit 4b determines, the series of operations is terminated.

  In S150, the antenna unit 4a transmits detection result information to the antenna unit 6a. When the antenna unit 4a supplies power to the detection device 3, a current flows through the strain gauge 3a, the resistance value of the metal resistance wire 3c of the strain gauge 3a is measured by the control unit 4b, and this measurement result is used as measurement result information for the antenna unit 4a. Transmits to the antenna unit 6a.

Next, the operation of the reader / writer device of the structure state detection system according to the first embodiment of the present invention will be described.
FIG. 8 is a flowchart for explaining the operation of the reader / writer device of the structure state detection system according to the first embodiment of the present invention.
In S200 shown in FIG. 8, the control unit 6g determines whether or not to request transmission. As shown in FIG. 1, the reader / writer device 6 is carried by the user M and goes to the site where the structure B exists, and approaches a distance where wireless communication can be performed between the wireless tag 4 and the reader / writer device 6. Next, when the user M turns on a power switch (not shown) of the reader / writer device 6, the reader / writer device 6 starts to be activated. As a result, the control unit 6g reads the control program from the storage unit 6c, and executes a series of processes according to the control program. When the control unit 6g determines that the transmission request is selected by the user M operating the input unit 6b, the process proceeds to S210, and when the control unit 6g determines that no transmission request is made, the series of operations ends.

  In S <b> 210, the reader / writer device 6 issues a transmission request to the wireless tag 4. As shown in FIG. 2, an electromagnetic wave is transmitted from the antenna unit 6a of the reader / writer device 6 to the antenna unit 4a of the wireless tag 4 to request transmission.

  In S220, the control unit 6g determines whether the reader / writer device 6 has received the unique ID information from the wireless tag 4. In S130 shown in FIG. 7, when the antenna unit 4a on the wireless tag 4 side transmits the unique ID information, the unique ID information is received by the antenna unit 6a. When the control unit 6g determines that the antenna unit 6a has received the unique ID information, the process proceeds to S230, and when the control unit 6g has not received the unique ID information, the series of operations ends.

  In S230, the storage unit 6c stores the unique ID information. When the antenna unit 6a receives the unique ID information from the antenna unit 4a, the control unit 6g outputs the unique ID information to the storage unit 6c, and the storage unit 6c stores the unique ID information as shown in FIG.

  In S240, the control unit 6g determines whether or not the reader / writer device 6 has received the detection result information from the wireless tag 4. In S150 illustrated in FIG. 7, when the antenna unit 4a on the wireless tag 4 side transmits the detection result information, the antenna unit 6a receives the detection result information. When the control unit 6g determines that the antenna unit 6a has received the detection result information, the process proceeds to S250, and when the control unit 6g has not received the detection result information, the series of operations is terminated.

  In S250, the storage unit 6c stores the detection result information. When the antenna unit 6a receives the detection result information from the antenna unit 4a, the control unit 6g outputs the detection result information to the storage unit 6c, and the storage unit 6c stores the detection result information as shown in FIG.

Next, the operation of the evaluation apparatus for the structure state detection system according to the first embodiment of the present invention will be described.
FIG. 9 is a flowchart for explaining the operation of the evaluation apparatus of the structure state detection system according to the first embodiment of the present invention.
In S300 shown in FIG. 9, the evaluation device 7 requests the reader / writer device 6 to transmit unique ID information. For example, the user M shown in FIG. 1 connects the reader / writer device 6 to the evaluation device 7 in the management office via the communication device 8 after the work is completed. Next, when the user M turns on a power switch (not shown) of the evaluation device 7, the evaluation device 7 starts to be activated, and the control unit 7f reads the evaluation program from the storage unit 7c and executes a series of processes according to the evaluation program. To do. When the interface unit 7a of the evaluation device 7 shown in FIG. 2 requests the interface unit 6e of the reader / writer device 6 to transmit unique ID information through the communication device 8, the control unit 6g of the reader / writer device 6 receives the unique ID information from the storage unit 6c. The interface unit 6e transmits this unique ID information to the interface unit 7a.

  In S310, the unique ID information is stored in the storage unit 7c. When the unique ID information is input from the interface unit 7a, the control unit 7f outputs the unique ID information to the storage unit 7c, and the storage unit 7c stores the unique ID information as shown in FIG.

  In S320, the evaluation device 7 requests the reader / writer device 6 to transmit detection result information. When the interface unit 7a shown in FIG. 2 requests the interface unit 6e to transmit detection result information, the control unit 6g reads the detection result information from the storage unit 6c, and the interface unit 6e transmits the detection result information to the interface unit 7a. To do.

  In S330, the storage unit 7c stores the detection result information. When detection result information is input from the interface unit 7a, the control unit 7f outputs the detection result information to the storage unit 7c, and the storage unit 7c stores the detection result information as shown in FIG.

In S340, the evaluation unit 7d evaluates the damaged state of the structure B. As shown in FIG. 6, the evaluation unit 7d calculates the strain of the reinforcing bar S ₁ based on the resistance value information R ₁₁ ,..., R _1n of the strain gauge 3a from the past to the present, and based on the calculation result. Then, the damage state of the reinforcing bar S ₁ is evaluated. The evaluation unit 7d outputs the evaluation result as evaluation result information to the control unit 7f.

  In S350, the storage unit 7c stores the evaluation result of the evaluation unit 7d. When the control unit 6g outputs the evaluation result information to the storage unit 7c, the storage unit 7c stores the evaluation result information.

  In S360, the display unit 7e displays the evaluation result of the evaluation unit 7d. When the control unit 6g transmits the evaluation result information to the display unit 7e, the display unit 7e displays the evaluation result information on the screen.

The structure state detection apparatus and the state detection system according to the first embodiment of the present invention have the following effects.
(1) In the first embodiment, the detection device 3 detects the state of the structure B in the embedded state, and the wireless tag 4 transmits the detection result of the detection device 3 in the embedded state. For this reason, for example, the state of the reinforcing bar S ₁ embedded in the concrete C ₁ of the structure B can be easily detected, and the detection result can be reliably transmitted. Further, since the detection device 3 and the wireless tag 4 are in an embedded state, it is possible to prevent an object from colliding or being maliciously damaged.

(2) In the first embodiment, the wireless tag 4 includes the antenna unit 4a for transmitting the detection result of the detection device 3, and the antenna unit 4a detects the induced electromotive force generated by the radio wave received from the outside. 3 is supplied. For this reason, it is not necessary to provide a power source for the wireless tag 4, and the detection result of the detection device 3 can be reliably transmitted by the wireless tag 4 having an inexpensive and simple structure.

(3) In the first embodiment, the detection device 3 detects the state of the reinforcing bar S ₁ of the structure B. For this reason, it is possible to easily detect a high place that is difficult to approach and dangerous, and a state of the reinforcing bar S ₁ in a buried place that cannot be visually inspected.

(4) In the first embodiment, the detection sensitivity direction of the detector 3 is to match the length direction of the reinforcing bar S _1, the detection device 3 with a plurality disposed along the length of the reinforcing bar S ₁ Yes. For this reason, it is possible to improve the detection accuracy by detecting the state of the reinforcing bar S _{1 in} a wide range by the detection device 3 having an inexpensive and simple structure.

(5) In the first embodiment, the detection device 3 detects the distortion of the structure B. For this reason, the damage state of the structure B can be evaluated by detecting distortion when receiving a disaster such as an earthquake or a fire.

(6) In the first embodiment, the detection device 3 includes the strain gauge 3 a whose electrical resistance changes according to the strain of the structure B. For this reason, the strain of the structure B can be easily detected by the strain gauge 3a having a simple and inexpensive structure without using an expensive and complicated optical fiber type detection device.

(7) In the first embodiment, the reader / writer device 6 receives the detection result of the detection device 3 from the wireless tag 4. For this reason, the state of the structure B can be detected from a long distance without contact.

(8) In the first embodiment, the evaluation device 7 evaluates the damage state of the structure B based on the detection result of the detection device 3. For this reason, for example, when the detection device 3 is the strain gauge 3a, the damage state of the structure B can be accurately evaluated by detecting the energized state of the strain gauge 3a.

(Second Embodiment)
FIG. 10 is a block diagram of a structure state detection system according to the second embodiment of the present invention. FIG. 11: is a block diagram of the state detection apparatus of the structure state detection system which concerns on 2nd Embodiment of this invention. In the following, the same parts as those shown in FIGS. 1 to 4 are denoted by the same reference numerals and detailed description thereof is omitted.
The detection device 3 shown in FIGS. 10 and 11 detects the distortion of the structure B and also detects the temperature of the structure B. The detection device 3 includes a thermocouple 3 e, and the electromotive force of the thermocouple 3 e changes according to the temperature of the structure B. As shown in FIG. 11, the thermocouple 3e is provided with two metal wires 3f of different materials and a pair of contacts 3g for connecting both ends of these metal wires 3f, and the temperature between the pair of contacts 3g. An electromotive force is generated by the difference. Thermocouple 3e, like strain gauge 3a, the concrete C ₁ is fixed by an adhesive to the outer peripheral portion of the reinforcing bar S ₁ before pouring, the strain along the length of the reinforcing bar S ₁ Gauge 3a And the same number is arranged.

  The control unit 4b shown in FIGS. 10 and 11 measures the resistance value of the strain gauge 3a and the voltage value of the thermocouple 3e, and transmits the measurement result as detection result information from the antenna unit 4a to the reader / writer device 6. The signal line 5 connects the lead wire 3d of the strain gauge 3a and the interface unit 4d, and connects the contact 3g of the thermocouple 3e and the interface unit 4d.

FIG. 12 is a schematic diagram schematically showing the data structure of the storage unit on the reader / writer device side in the structure state detection system according to the second embodiment of the present invention.
For example, as shown in FIG. 12, the storage unit 6c shown in FIG. 10 stores the unique ID information I ₁ ,..., I _N of each detection device 3, and the year and month when each detection device 3 performs a detection operation. Detection time information D ₁₁ ,..., D _N1 related to the date and time, resistance value information R ₁₁ ,..., R _N1 related to the resistance value of the strain gauge 3a of each detection device 3, and the voltage of the thermocouple 3e of each detection device 3 The voltage value information V ₁₁ ,..., V _N1 related to the values are stored as detection result information.

FIG. 13 is a schematic diagram schematically showing the data structure of the storage unit on the evaluation device side of the structure state detection system according to the second embodiment of the present invention.
When the detection device 3 detects the distortion and temperature of the structure B, the evaluation device 7 shown in FIG. 10 corrects the distortion based on the temperature, and damages the structure B based on the corrected distortion. Assess the condition. As shown in FIG. 10, the evaluation device 7 includes a correction unit 7g that corrects distortion based on temperature. Storage unit 7c are, for example, as shown in FIG. 13, unique ID information I _1, ..., detection time for each I _N information D _11, ..., and D _1n, the resistance value information R _11, ..., and R _1n, The voltage value information V ₁₁ ,..., V _N1 is stored in chronological order. The evaluation unit 7d evaluates the resistance value of the strain gauge 3a and the voltage value of the thermocouple 3e according to the evaluation program, and evaluates the damage state of the structure B based on the measurement result. The correction unit 7g corrects the resistance value information R ₁₁ ,..., R _1n based on the voltage value information V ₁₁ ,..., V _N1 stored in the storage unit 7c, and corrects the resistance value information R ₁₁ ,. _1n is output to the control unit 7f. Evaluation unit 7d, the resistance value information R ₁₁ the corrected strain gauge 3a from the past up to the present, ..., calculates the distortion of the reinforcing bars S ₁ based on the R _1n, rebar S ₁ on the basis of the calculation result Assess the damage status.

In addition to the effects of the first embodiment, the structure state detection system and the state detection apparatus according to the second embodiment of the present invention have the following effects.
(1) In the second embodiment, the detection device 3 detects the temperature of the structure B. For this reason, when the resistance value of the strain gauge 3a is affected by the temperature, the resistance value of the strain gauge 3a can be accurately detected by detecting the temperature of the structure B.

(2) In the second embodiment, the detection device 3 includes the thermocouple 3e whose electromotive force changes according to the temperature of the structure B. For this reason, the temperature of the structure B can be easily detected by the thermocouple 3e having an inexpensive and simple structure.

(3) In the second embodiment, when the detection device 3 detects the distortion and temperature of the structure B, the distortion is corrected based on the temperature, and the structure B is corrected based on the corrected distortion. The evaluation device 7 evaluates the damaged state. For this reason, even if the resistance value of the strain gauge 3a changes due to a change in temperature, the resistance value is corrected in consideration of the temperature characteristics, and the damage state of the structure B can be more accurately evaluated.

(Third embodiment)
FIG. 14 is a block diagram of a state detection system according to the third embodiment of the present invention. FIG. 15 is a schematic diagram schematically showing the data structure of the storage unit on the wireless tag side of the structure state detection system according to the third embodiment of the present invention.
The wireless tag 4 illustrated in FIG. 14 includes a storage unit 4f that stores the detection result of the detection device 3, and the storage unit 4f stores a control program, unique ID information, and detection result information. The memory | storage part 4f memorize | stores the detection result of the detection apparatus 3 immediately after construction completion of the structure B, updates the past detection result of the detection apparatus 3, and memorize | stores the latest detection result of this detection apparatus 3. . For example, as illustrated in FIG. 15, the storage unit 4 f stores the unique ID information I ₁ of the detection device 3, and the reference detection regarding the reference date and the reference time when the detection device 3 starts the detection operation. Time information D ₁₁ , reference resistance value information R ₁₁ regarding the reference resistance value (initial setting value) of the strain gauge 3 a of each detection device 3, and reference voltage value (initial setting value) of the thermocouple 3 e of each detection device 3 The reference voltage value information V ₁₁ is stored as detection result information.

Next, the operation of the wireless tag of the structure state detection system according to the third embodiment of the present invention will be described.
FIG. 16 is a flowchart for explaining the operation of the wireless tag of the structure state detection system according to the third embodiment of the present invention. In the following, the same processes as those shown in FIG. 7 are denoted by the same reference numerals and detailed description thereof is omitted.
In S160 illustrated in FIG. 16, the control unit 4b determines whether a reset request has been received. When the control unit 4b determines that the reset request is received from the radio wave received by the antenna unit 4a, the process proceeds to S170, and when the control unit 4b determines that the reset request is not received from the radio wave received by the antenna unit 4a, a series of operations are performed. finish.

In S170, the storage unit 4f stores the detection result information. For example, the concrete C ₁ fitted with a detection device 3 to the reinforcing bar S ₁ before pouring, then when concrete is C _1, the resistance value of the strain gauge 3a before and after the concrete is C ₁ or thermocouple The voltage value of 3e changes. Therefore, when the wireless tag 4 receives a reset request from the reader-writer device 6, the voltage value of the resistance value and the thermocouple 3e strain gauge 3a just finished completed all construction the pouring of the concrete C ₁ The control unit 4b measures, and these measurement results are stored in the storage unit 4f as reference resistance value information and reference voltage value information. When the wireless tag 4 receives a reset request from the reader / writer device 6, the previous measurement result is updated each time the control unit 4b measures the resistance value of the strain gauge 3a and the voltage value of the thermocouple 3e. Is stored in the storage unit 4f as reference resistance value information and reference voltage value information.

In addition to the effects of the first embodiment and the second embodiment, the state detection system for a structure and the state detection apparatus according to the third embodiment of the present invention have the following effects.
(1) In the third embodiment, the wireless tag 4 includes a storage unit 4 f that stores the detection result of the detection device 3. For this reason, it is not necessary to record and store the detection result of the detection device 3 in the reader / writer device 6 or the evaluation device 7, and the detection result of the detection device 3 can be recorded and held in the structure B itself. it can.

(2) In the third embodiment, the storage unit 4f stores the detection result of the detection device 3 immediately after the construction of the structure B is completed. For this reason, while being able to memorize | store and grasp the detection result immediately after construction completion in the memory | storage part 4f, the detection result immediately after construction completion can be confirmed as an initial value.

(3) In the third embodiment, the past detection result of the detection device 3 is updated, and the latest detection result of the detection device 3 is stored in the storage unit 4f. Therefore, by replacing the current detection result with the previous detection result, the latest measurement result can be used as a reference value for the next measurement.

(Fourth embodiment)
FIG. 17 is a block diagram of a structure state detection system according to a fourth embodiment of the present invention. FIG. 18: is a block diagram of the state detection apparatus of the structure state detection system based on 4th Embodiment of this invention.
The wireless tag 4 shown in FIGS. 17 and 18 is provided with a power supply unit 4g unlike the wireless tag 4 shown in FIGS. 2 and 3, and operates with the power of the power supply unit 4g to communicate with the reader / writer device 6. It is an active type tag. The control unit 4b controls the supply of power from the power supply unit 4g to the detection device 3 so that the detection device 3 starts the detection operation at a predetermined timing, and operates using the power supplied by the power supply unit 4g as a power source. To do. For example, the control unit 4b transmits the unique ID information read from the storage unit 4f to the reader / writer device 6 from the antenna unit 4a, stores the detection result information in the storage unit 4f, and stores the detection result information from the storage unit 4f. The data is read out and transmitted from the antenna unit 4a to the reader / writer device 6. The control unit 4b is connected so as to be able to communicate with the antenna unit 4a, the storage unit 4f, the interface unit 4d, and the power supply unit 4g. The storage unit 4f stores a control program, unique ID information, and detection result information. Storage unit 4f is, for example, as shown in FIGS. 6 and 12, the detection time information D _11, ..., and D _1n, the resistance value information R _11, ..., and R _1n, voltage value information V _11, ..., V and stores in chronological order and _1n as the detection result information, a reference detection time information D ₁₁ as shown in FIG. 15, a reference resistance value information R _11, and a reference voltage value information V ₁₁ stores as the detection result information Or The power supply unit 4 g is a part that supplies power to the detection device 3. The power supply unit 4g is, for example, a secondary battery that is charged by an induced electromotive force generated by the antenna unit 4a when the antenna unit 4a receives a radio wave transmitted by the antenna unit 6a on the reader / writer device 6 side. .

Next, the operation of the wireless tag of the structure state detection system according to the fourth embodiment of the present invention will be described.
FIG. 19 is a flowchart for explaining the operation of the wireless tag of the structure state detection system according to the fourth embodiment of the present invention.
In S400 shown in FIG. 19, the control unit 4b determines whether or not it is an operation timing. The control unit 4b includes a timer circuit (not shown). Based on the output signal of the timer circuit, the control unit 4b determines whether or not the time for starting the detection operation has been reached, and the detection start time has been reached. When the control unit 4b determines, the process proceeds to S410. When the control unit 4b determines that the detection start time has not been reached, the determination is repeated until the detection start time is reached.

  In S410, the control unit 4b supplies power to the detection device 3. When the control unit 4b supplies the power of the power supply unit 4g to the detection device 3, a current flows through the strain gauge 3a and the thermocouple 3e of the detection device 3.

  In S420, the control unit 4b starts measurement. When electric power is supplied to the detection device 3, the control unit 4b measures the resistance value of the strain gauge 3a and the voltage value of the thermocouple 3e.

  In S430, the storage unit 4f stores the detection result information. When the control unit 4b measures the resistance value of the strain gauge 3a and the voltage value of the thermocouple 3e, the control unit 4b outputs the measurement result as detection result information to the storage unit 4f, and the storage unit 4f outputs the detection result information. Remember.

  In S440, the control unit 4b determines whether it is the transmission timing. Based on an output signal of a timer circuit (not shown), the control unit 4b determines whether or not the time for starting the transmission operation has been reached. When the control unit 4b determines that the transmission start time has been reached, the process proceeds to S450, where transmission starts. When the control unit 4b determines that the time has not been reached, the determination is repeated until the transmission start time is reached.

  In S450, the antenna unit 4a transmits the unique ID information and the detection result information. The detection result information is read from the storage unit 4f by the control unit 4b, and this detection result information is transmitted from the antenna unit 4a to the control unit 4b. As shown in FIG. 1, the reader / writer device 6 is carried by a user M, approached to a wireless communication distance between the wireless tag 4 and the reader / writer device 6, and a power switch (not shown) of the reader / writer device 6 is used. Person M performs ON operation. As a result, the unique ID information and detection result information transmitted from the wireless tag 4 at a predetermined transmission timing are received by the antenna unit 6a of the reader / writer device 6, the storage unit 6c stores the information, and the evaluation device 7 The state of the structure B is evaluated.

In addition to the effects of the first to third embodiments, the structure state detection system and its state detection apparatus according to the fourth embodiment of the present invention have the following effects.
In the fourth embodiment, the power supply unit 4g supplies power to the detection device 3, and the power supply operation from the power supply unit 4g to the detection device 3 is performed so that the detection device 3 starts the detection operation at a predetermined timing. The control unit 4b controls, and the antenna unit 4a transmits the detection result of the detection device 3. For this reason, the state of the structure B can be periodically detected, and the detection result can be periodically transmitted from the wireless tag 4. Therefore, the detection result of the detection device 3 can be received by a reader / writer device having only a simple reception function.

(Fifth embodiment)
FIG. 20 is a schematic diagram schematically showing a use state of the structure state detection system according to the fifth embodiment of the present invention. FIG. 21: is a conceptual diagram for demonstrating the installation method of the state detection apparatus of the state detection system of the structure which concerns on 5th Embodiment of this invention, and FIG. 21 (A)-FIG. 21 (F) starts construction. It is a conceptual diagram which shows the procedure from construction to completion of construction roughly.
Pile foundation B ₄ shown in FIG. 20 is constructed by the reinforcing steel cage S ₂ and the concrete C _1, the upper part of the pile foundation B ₄ pile head B ₄₁ is formed. Rebar cage S _2, as shown in FIG. 21 (A), a buried object the assembly of the reinforcing bar S ₁ in cage are assembled in a cylindrical or prismatic by welding for example, a reinforcing bar S _1. The core rebar S ₃ shown in FIG. 20 and FIG. 21 (D) is a member responsible for transmission of the pulling force generated in the pile foundation B ₄ at the time of an earthquake, and is incorporated in the rebar cage S ₂ . The footing B ₃ shown in FIGS. 20 and 21 (E) and (F) is constructed on the discarded concrete C ₂ , and the discarded concrete C ₂ is made of cracked chestnut or crushed stone before placing the footing B ₃ . It is a concrete structure placed on top. The detection device 3 shown in FIG. 20 detects the state of the reinforcing bar S ₁ of the pile head B ₄₁ and is fixed to the reinforcing bar S ₁ of the reinforcing bar S ₂ above the discarded concrete C ₂ in the footing B _3. It is embedded in the inside concrete C _1. For example, the wireless tag 4 is embedded in the concrete C ₁ of the pillar B ₂ and is electrically connected to the detection device 3 by a signal line 5.

Next, an installation method of the state detection device of the structure state detection system according to the fifth embodiment of the present invention will be described.
As shown in FIG. 21 (A), a bore hole G ₁ drilled into the ground G such as by excavating machines, darken the rebar cage S ₂ in the borehole G _1, pouring concrete C ₁ to borehole G _1. As a result, as shown in FIG. 21 (B), when the concrete C ₁ is hardened, a pile foundation B ₄ is constructed. In the pile head B ₄₁ after the concrete is placed, the reinforcing bar S ₂ is covered with the concrete C ₁ . Therefore, as shown in FIG. 21 (C), the concrete C ₁ of pile head B ₄₁ removed to expose the upper end surface of the pile head B ₄₁ a (Kuitentan). Next, as shown in FIG. 21 (D), pile head and Da設concrete C ₂ discarded at a predetermined height on the upper end face of the B _41, the discarded rebar cage S ₂ exposed from the top surface of the concrete C ₂ Core rebar S ₃ is incorporated into At this time, the detecting device 3 is fixed to the reinforcing bar S ₁ of the reinforcing bar S ₂ exposed from the upper surface of the discarded concrete C ₂ , and the signal line 5 is connected to the detecting device 3. Next, as shown in FIG. 21E, the footing B ₃ is constructed on the discarded concrete C ₂ and the detection device 3 is embedded in the footing B ₃ . At this time, the footing B ₃ is constructed on the discarded concrete C ₂ in a state where the signal line 5 at the end connected to the wireless tag 4 is drawn to the outside. Thereafter, as shown in FIG. 21F, a pillar B ₂ is constructed on the footing B ₃ , and the wireless tag 4 is embedded in the pillar B ₂ .

In addition to the effects of the first to fourth embodiments, the structure state detection system and the state detection apparatus according to the fifth embodiment have the following effects.
In the fifth embodiment, for detecting the detection device 3 the state of the reinforcing bar S ₁ of pile head B _41. For this reason, it is possible to evaluate the damage state of the pile foundation B ₄ that is easily damaged when an earthquake occurs. Further, when the embedded detecting device 3 to the top of pile foundation B ₄ is below the footing B _3, for passing the signal lines 5 between the footing B ₃ and pile foundation B _4, by shaking during an earthquake The footing B ₃ and the pile foundation B ₄ may be relatively displaced and the signal line 5 may be broken. In the fifth embodiment, the detection device 3 is embedded above the pile foundation B ₄ in the footing B ₃ . Therefore, it is possible to prevent the can footing B ₃ and pile foundation B ₄ and the signal line 5 be relatively displaced by shaking during earthquake rupture.

(Sixth embodiment)
FIG. 22 is a schematic view schematically showing a use state of the state detection device of the structure state detection system according to the sixth embodiment of the present invention, and FIG. 22 (A) is a state installed at the column base of the bridge. FIG. 22B is a schematic diagram showing a state where the bridge is installed at the abutment base of the bridge.
Structure B shown in FIG. 22 (A) is a concrete structure such as a ramen viaduct. A structure B shown in FIG. 22B is an abutment that receives the beam B ₁ on both sides of the bridge, and includes a frame B ₅ that supports the beam B ₁ . The base portions B ₂₁ , B ₂₂ , and B ₅₁ shown in FIG. 22 are base portions where two members are connected, the base portion B ₂₁ is a base portion of the column B ₂ connected to the beam B _1, and the base portion B ₂₂ is a footing. The base portion of the column B ₂ connected to B ₃ and the base portion B ₅₁ are the base portion of the frame B ₅ connected to the footing B ₃ . The detection device 3 detects the state of the bases B ₂₁ , B ₂₂ , B ₅₁ of the structure B. When the structure B is a bridge such as a ramen viaduct, the detection device 3 shown in FIG. 22A detects the state of the bases B ₂₁ and B ₂₂ of the pillar B ₂ of the bridge, and the structure shown in FIG. The detection device 3 shown detects the state of the base B ₅₁ of the abutment when the structure B is an abutment of the bridge.

In addition to the effects of the first to fifth embodiments, the structure state detection system and the state detection apparatus according to the sixth embodiment have the following effects.
(1) In the sixth embodiment, the detection device 3 detects the state of the bases B ₂₁ , B ₂₂ , B ₅₁ of the structure B. For example, when a low-stiffness column B ₂ or a frame B ₅ is connected to a high-stiffness beam B ₁ or a footing B ₃ , the rebar S _{1 of the} bases B ₂₁ , B ₂₂ , B ₅₁ is greatly damaged by an earthquake. May receive. In the sixth embodiment, the state of the bases B ₂₁ , B ₂₂ , and B ₅₁ having greatly different strength ratios (stiffness ratios) for the stress between the two members is detected and evaluated by the detection device 3. Can do.

(2) In the sixth embodiment, the detection device 3 detects the state of the bases B ₂₁ and B ₂₂ of the bridge column B ₂ or the base B ₅₁ of the abutment. For this reason, it is possible to detect the state of the bases B ₂₁ , B ₂₂ , and B ₅₁ where damage due to the earthquake is likely to concentrate, and to evaluate the soundness after the earthquake.

(Seventh embodiment)
FIG. 23 is a schematic view schematically showing a use state of the state detection device of the structure state detection system according to the seventh embodiment of the present invention, and FIG. 23 (A) is a cross-sectional view. (B) is a longitudinal sectional view. FIG. 24 is a schematic diagram for explaining a crack detection operation by the state detection device of the structure state detection system according to the seventh embodiment of the present invention, and FIG. 24 (A) is an initial stage at which the crack has occurred. FIG. 24B is a cross-sectional view showing a state in which a crack has developed.
23 detect the state of the concrete C ₁ of the structure B, and a total of three detection devices 3X to 3Z are arranged in the concrete C ₁ so that the detection sensitivity directions are different from each other. The detection devices 3 </ b> X to 3 </ b> Z are arranged in the concrete C ₁ so that the detection sensitivity directions are the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively, and are connected to the wireless tag 4 by the signal line 5. For example, the detection device 3X detects a crack W ₁ that progresses from the reinforcing bar S ₁ along the surface of the concrete C ₁ as shown in FIG. 24A, and the detection device 3Y as shown in FIG. 24B. A crack W ₂ that propagates from the reinforcing bar S ₁ toward the surface of the concrete C ₁ is detected.

Next, the operation of the state detection apparatus of the structure state detection system according to the seventh embodiment of the present invention will be described.
For example, as shown in FIG. 24 (A), the concrete C ₁ around the reinforcing bar S ₁ is lifted when the reinforcing bars S ₁ is corroded, cracking W ₁ progresses along the surface of the concrete C _1. As a result, the detection device 3X detects cracks W ₁ that evolves from rebar S ₁ along the surface of the concrete C _1. As shown in FIG. 24 (B), the corrosion of reinforcing bars S ₁ is further advances, degradation of the concrete C ₁ lift from rebar S ₁ is peeled off the concrete C ₁ is further advanced, towards the surface of the concrete C ₁ crack W ₂ progresses. As a result, the detection device 3Y cracks W ₂ that evolves from rebar S ₁ toward the surface of the concrete C ₁ is detected.

In addition to the effects of the first to sixth embodiments, the structure state detection system and its state detection apparatus according to the seventh embodiment have the following effects.
(1) In the seventh embodiment, the state of the concrete C ₁ of the structure B detector 3X~3Z detects. For this reason, it is possible to easily evaluate the damage state of the structure B by detecting a deterioration state such as peeling of the concrete C ₁ .

(2) In the seventh embodiment, the detection sensitivity direction is arranged detector 3X~3Z in the concrete C ₁ differently, respectively. For this reason, while being able to confirm the directionality of peeling and cracking due to deterioration of the concrete C ₁ , it is possible to evaluate the degree of progress of deterioration of the structure B.

(3) In the seventh embodiment, X-axis sensitivity direction, respectively, the detection device 3X~3Z the concrete C ₁ such that the Y axis and the Z-axis direction is arranged. For this reason, it is possible to detect the cracks W ₁ and W ₂ that propagate in the concrete C ₁ in various directions, and to evaluate the damaged state of the structure B from the initial stage.

(4) In the seventh embodiment, the structure cracks W ₁ to progress along the surface of the concrete C ₁ of the structure B from rebar S ₁ detecting device 3X detects a B, the surface of the concrete C ₁ towards detector 3Y cracks W ₂ that evolves from rebar S ₁ and is detected. For this reason, it is possible to detect the initial start of floating of the concrete C ₁ from the reinforcing bar S ₁ and to detect a crack toward the surface of the concrete C ₁ .

(Eighth embodiment)
FIG. 25 is a schematic diagram schematically showing an embedded object detected by the structure state detection system according to the eighth embodiment of the present invention, and FIG. 25 (A) shows the state of the embedded object before installation. FIG. 25B is an external view showing the state of the buried object after installation.
The reinforcing bar S ₂ shown in FIG. 25 includes a detection device 3 that detects the state of the detection target portion, and this detection device 3 can be connected to the wireless tag 4 through the signal line 5. Detecting device 3, the detection target portion when a reinforcing bar S ₁ detects the state of the reinforcing bar S _1, when the detection target portion is concrete C ₁ detects the state of the concrete C _1. As shown in FIG. 25A, the detection device 3 is fixed to the reinforcing bar S ₁ in advance when the reinforcing bar S ₂ is assembled at an assembly factory or the like, and is carried to the site in a state of being fixed to the reinforcing bar S _1. The As shown in FIG. 25 (B), the detection device 3 is embedded in the concrete C ₁ together with the reinforcing bar S _{2 while} being connected to the wireless tag 4 by the signal line 5. For example, when the outer diameter D of the pile foundation B ₄ is detected, the detection device 3 is fixed at a position where damage is likely to concentrate on the reinforcing bar S ₁ within the depth H (= 1.5D) from the lower surface of the footing B ₃ . . In the eighth embodiment, in addition to the effects of the first to seventh embodiments, the rebar cage S ₂ is commercialized with the detection device 3 attached to the rebar S _1. The state of the structure B can be easily detected simply by bringing ₂ to the site and installing it.

(Other embodiments)
The present invention is not limited to the embodiment described above, and various modifications or changes can be made as described below, and these are also within the scope of the present invention.
(1) In this embodiment, the bridge is described as an example of the structure B, but the present invention can also be applied to other fixed structures such as a tunnel or an overhead pole. In this embodiment, the bridge on which the railway vehicle travels has been described as an example. However, the present invention can also be applied to a bridge on which an automobile travels or a bridge on which only pedestrians pass. Furthermore, in this embodiment, the case where the structure B is a concrete structure has been described as an example. However, the present invention is not limited to such a structure. For example, the present invention can also be applied to a composite (composite) structure such as a composite girder composed of a reinforced concrete slab and a steel girder, or an H steel embedding girder in which an H-shaped steel is embedded in an RC girder. Can do.

(2) In this embodiment, the case where the detection device 3 is configured by the strain gauge 3a has been described as an example. However, the detection device 3 is configured only by a crack detection sensor (crack sensor) other than the strain gauge 3a or the thermocouple 3e. It can also be configured. For example, when the detection device 3 is configured only by the thermocouple 3e, the damage state of the structure B due to a fire can be evaluated. Further, in this embodiment, the case where the detection device 3 is configured by the strain gauge 3a and the thermocouple 3e has been described as an example, but the detection device 3 is configured by one sensor having a strain detection function and a temperature detection function. It can also be configured. Furthermore, in this embodiment, the case where the pile foundation B ₄ is a cast-in-place pile has been described as an example, but the present invention can also be applied to a case where the pile foundation B ₄ is an existing pile.

(3) In this embodiment, the case where the state detection system 1 is configured by the reader / writer device 6 having a reception function and the evaluation device 7 having an analysis function has been described as an example. However, the reader / writer device 6 and the evaluation device are described. 7 and the state detection system 1 can be configured by a handy reader / writer device. In this embodiment, the case where the evaluation device 7 evaluates the state of the structure B has been described as an example. However, the state of the structure B is evaluated on the wireless tag 4 side, and the evaluation result is used as a reader / writer device. It can also be sent to the 6 side. Further, in this embodiment, the reinforcing steel cage S ₂ has been described as an example, it is possible for other buried objects such as piles that are buried in the ground to apply the present invention as a buried object. In this case, the wireless tag 4 can be fixed in a state of being exposed on the surface of the embedded object.

DESCRIPTION OF SYMBOLS 1 State detection system 2 State detection apparatus 3 Detection apparatus 3X-3Z Detection apparatus 3a Strain gauge 3e Thermocouple 4 Radio | wireless tag 4a Antenna part 4b Control part 4c Storage part 4d Interface part 4f Storage part 4g Power supply part 5 Signal line 6 Reader / writer apparatus 6a Antenna unit 6c Storage unit 6e Interface unit 6g Control unit 7 Evaluation device 7a Interface unit 7c Storage unit 7d Evaluation unit 7f Control unit 7g Correction unit B Structure (concrete structure)
B ₁ digit B ₂ pillar B ₂₁ , B ₂₂ base (pillar base)
B ₃ footing B ₄ pile foundation B ₄₁ pile head B ₅ frame B ₅₁ base (Abutment base)
C ₁ concrete (detection target)
S ₁ rebar (detection target part)
S ₂ rebar basket (buried)
M User V Vehicle R Track W ₁ , W ₂ Crack

Claims (3)

An embedded object comprising a detection device for detecting the state of the detection target part,
The detection device can detect the state of the reinforcing bar of the pile foundation and can be connected to a wireless tag that transmits the state of the reinforcing bar of the pile foundation through a signal line, and when the outer diameter of the pile foundation is D, the footing It is fixed to the rebar within the depth H = 1.5D from the lower surface of
A buried object characterized by In the buried object according to claim 1,
The detection device detects distortion of the reinforcing bar of the pile foundation;
A buried object characterized by In the buried object according to claim 2,
The detection device includes a strain gauge whose electrical resistance changes according to the strain of the reinforcing bar of the pile foundation,
A buried object characterized by

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