JP6087246B2 - Manhole ceiling deterioration detection method - Google Patents

Description

  The present invention relates to a manhole ceiling deterioration detection method for detecting concrete peeling, cracking or deformation of concrete on a manhole ceiling from the ground.

  As a method for detecting the peeling of concrete on the manhole ceiling from the ground, there is a “manhole abnormality detection system” described in Patent Document 1. In this system, a piezoelectric sensor is installed between the top plate installed along the ceiling of the manhole and the column that supports the top plate from below, and the weight of the concrete pieces peeled off from the ceiling of the manhole is passed through the top plate. This is a configuration that transmits the information from the wireless tag to the reader on the ground.

Japanese Patent No. 5178852

  In the system of Patent Document 1, the top plate and the support installed in the manhole are large, and it is not easy to carry the member into the manhole, and improvement has been desired in terms of cost.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a manhole ceiling deterioration detection method that can detect a concrete peeling, cracking or deformation of a manhole ceiling from the ground easily and at low cost using a wireless tag.

The manhole ceiling deterioration detection method of the present invention is configured to form a wireless tag antenna wiring and deterioration detection wiring on the concrete surface of the manhole ceiling, and connect the antenna wiring and the antenna terminal of the wireless tag circuit unit to configure the wireless tag. In addition, a sensor that measures the electrical resistance value of the deterioration detection wiring and notifies the wireless tag is configured, the wireless tag transmits the electrical resistance value measured by the sensor to the reader on the ground, and the reader receives together determine the deterioration of the manhole ceiling with the electric resistance value is equal to or greater than a prescribed value, attempt to read the RFID tag from the reader, the deterioration of the manhole ceiling when reading of the wireless tag becomes impossible by breakage of the antenna wire Judge as.

In manhole ceiling deterioration detecting method of the present invention, the antenna wiring and the deterioration detecting wiring have a shape intersecting at a plurality of positions relative to the closest reinforcing bars in the concrete surface of the manhole ceiling, and most concrete surface of the manhole ceiling It is arranged so that it crosses diagonally with respect to the nearby reinforcing bars.

In the present invention , when the antenna wiring formed on the concrete surface of the manhole ceiling is disconnected due to peeling, cracking or deformation of the concrete surface, the reader on the ground cannot read the wireless tag, and the manhole ceiling is deteriorated. Can be determined.

Furthermore , when the electrical resistance value exceeds a predetermined value due to the concrete surface peeling, cracking or deformation of the deterioration detection wiring formed on the concrete surface of the manhole ceiling, the ground reader reads the information from the wireless tag. Thus, it can be determined as degradation of the manhole ceiling.

It is a figure which shows Example 1 of the manhole ceiling degradation detection method of this invention. It is a figure explaining the shape of the antenna wiring. It is a figure which shows the relationship between the antenna wiring and a crack. FIG. 4 is a diagram illustrating a configuration example of a wiring contact member 43. FIG. 3 is a diagram showing a cross-sectional structure 1 of an antenna wiring 42. It is a figure which shows the cross-section 2 of the antenna wiring. It is a figure which shows Example 2 of the manhole ceiling degradation detection method of this invention.

  FIG. 1 shows Example 1 of the manhole ceiling deterioration detection method of the present invention. FIG. 1 (1) shows a cross-sectional configuration of the entire manhole, and FIG. 1 (2) shows a planar configuration of the wireless tag.

  In FIG. 1, 1 is a manhole body, 2 is a manhole ceiling, 3 is a manhole cover, 4 is a wireless tag, and 5 is a reader. A plurality of wireless tags 4 are installed on the manhole ceiling 2. The wireless tag 4 includes a wireless tag circuit portion 41, an antenna wiring 42 connected to the antenna terminal of the wireless tag circuit portion 41, and a wiring contact member 43 inserted at a predetermined position of the antenna wiring 42.

  The reader 5 on the ground tries to read the wireless tag 4 in the vicinity of the manhole cover 3. Here, when the reader 5 can read the wireless tag 4, that is, when a signal such as an ID transmitted from the wireless tag 4 can be detected, it is determined that the antenna wiring 42 is not disconnected. This indicates that the concrete of the manhole ceiling 2 that causes the disconnection of the antenna wiring 42 is not peeled off, cracked, or deformed, that is, the deterioration of the manhole ceiling 2 has not progressed.

  On the other hand, if the antenna wiring 42 is disconnected due to peeling, cracking, or deformation in the concrete of the manhole ceiling 2, the wireless tag 4 cannot transmit a signal such as an ID. At this time, the reader 5 determines that the manhole ceiling 2 has deteriorated when the wireless tag 4 cannot be read.

  When a plurality of wireless tags 4 are installed on the manhole ceiling 2, it is possible to roughly determine a position where peeling, cracking, or deformation has occurred from the ID of the wireless tag 4 that cannot be read by the reader 5. If there are a plurality of wireless tags 4 whose IDs cannot be read by the reader 5 with respect to the same manhole 1, it is possible to estimate a large size of peeling, cracking, and deformation from the positional relationship of the wireless tags 4. For example, when none of the IDs of the wireless tags 4 installed adjacent to each other can be read, peeling, cracking, or deformation has occurred due to the size of the manhole ceiling 2 across the positions of the wireless tags 4. Can be considered.

  By the way, if the position of peeling, cracking or deformation of the concrete on the manhole ceiling 2 is deviated from the antenna wiring 42, the peeling, cracking or deformation of the concrete may not be directly connected to the disconnection of the antenna wiring 42. Regarding this problem, the arrangement and shape of the antenna wiring 42 are devised as follows. The concrete peeling, cracking and deformation of the manhole ceiling 2 is mainly due to the expansion of the reinforcing bars due to the oxidation and corrosion of the reinforcing bars closest to the concrete surface. Therefore, the reinforcing bars shown by the broken lines in Fig. 2 (1) and (2) The antenna wiring 42 is formed so as to increase the number of portions that are not parallel to each other. Alternatively, the antenna wiring 42 is formed in a zigzag pattern as shown in FIG. The diagonal direction in FIG. 2 (2) is effective when the direction of the reinforcing bar is unknown whether it is vertical or horizontal. Thereby, deterioration of the manhole ceiling 2 can be determined reliably. Furthermore, for example, the crack of concrete does not overlap with the antenna wiring 42, and the crack can be easily found by visual observation.

  In addition, the micro crack (hair crack) by shrinkage also occurs in concrete. Such a hair crack can be left alone, unlike a structural crack that requires repair. However, it is inconvenient that the antenna wiring 42 is also disconnected from the hair crack and the wireless tag cannot be read and it is determined that the manhole ceiling 2 is deteriorated. Regarding this problem, the material of the antenna wiring 42 includes an expansion / contraction component, and as shown in FIG. The width of the crack where the antenna wiring 42 is not disconnected can be adjusted by the expansion / contraction component.

  FIG. 4 shows a configuration example of the wiring contact member 43. Here, the wiring contact member 43 provided in the straight line portion of the antenna wiring 42 is shown as an example, but the same applies to the wiring contact member 43 provided in the corner portion of the antenna wiring 42. 4 (1) shows a planar configuration of the wiring contact member 43, and FIGS. 4 (2) and 4 (3) show cross-sectional configurations of the wiring contact member 43. FIG.

  The wiring contact member 43 is composed of two contact members 43A and 43B that separate a part of the antenna wiring 42 and are connected to respective end portions. If there is no abnormality on the concrete surface of the manhole ceiling 2, as shown in FIG. 4 (2), the two contact members 43A and 43B come into contact with each other and function as the antenna wiring. On the other hand, if the concrete surface of the manhole ceiling 2 is deformed so as to be raised, the two contact members 43A and 43B are separated from each other and the antenna wiring 42 is disconnected as shown in FIG. The same applies to the structure in which the tip portions of the contact members 43A and 43B are in contact with each other.

FIG. 5 shows a cross-sectional structure 1 of the antenna wiring 42.
In FIG. 5, the antenna wiring 42 is formed on the concrete surface of the manhole ceiling 2 by a laminated structure of a first protective thin film 421, a metal thin film 422, and a second protective thin film 423. First, a negative sheet having the shape of the antenna wiring 42 is attached to a concrete surface, and a protective film material is sprayed on to form a first protective thin film 421. Next, metal powder is sprayed to form a metal thin film 422 that becomes a conductor portion of the antenna wiring 42, and a protective film material is sprayed to form a second protective thin film 423. Note that a negative sheet having the shape of the antenna wiring 42 is used only when the metal thin film 422 is formed, and the first protective thin film 421 and the second protective thin film 423 cover the entire shape of the antenna wiring 42 without using the negative sheet. Alternatively, a protective film material may be sprayed.

  The RFID tag circuit portion 41 and the wiring contact member 43 are each provided with a terminal portion for connection to the antenna wiring 42, and a negative sheet is formed so that the terminal portion and the metal thin film 422 of the antenna wiring 42 are connected. To do.

FIG. 6 shows a cross-sectional structure 2 of the antenna wiring 42.
In FIG. 6, the antenna wiring 42 is formed by applying an adhesive layer 424 serving as a first protective thin film on the concrete surface of the manhole ceiling 2 using a negative sheet having the shape of the antenna wiring 42, and applying a metal foil 425 thereon. The portion without the adhesive layer 424 is peeled off to form the conductor portion of the antenna wiring 42, and finally the water repellent spray is sprayed using a negative sheet having the shape of the antenna wiring 42 to form the water repellent protective film 426. Configured. The water repellent protective film 426 may be formed by spraying so as to cover the entire shape of the antenna wiring 42 without using a negative sheet.

  The antenna wiring 42 may be formed by a method of transferring the antenna wiring formed on the seal onto the concrete surface of the manhole ceiling 2, instead of the spraying method using the negative sheet shown in FIGS.

  FIG. 7 shows a second embodiment of the manhole ceiling deterioration detection method of the present invention. FIG. 7 (1) shows a cross-sectional configuration of the entire manhole, and FIG. 7 (2) shows a planar configuration of the wireless tag and sensor unit.

  In FIG. 7, 1 is a manhole body, 2 is a manhole ceiling, 3 is a manhole cover, 4 is a wireless tag, 5 is a reader, and 6 is a sensor unit. A set of a plurality of wireless tags 4 and sensor units 6 is installed on the manhole ceiling 2. The wireless tag 4 includes a wireless tag circuit portion 41, an antenna wiring 42 connected to the antenna terminal of the wireless tag circuit portion 41, and a wiring contact member 43 inserted at a predetermined position of the antenna wiring 42. The sensor unit 6 includes a resistance measurement circuit unit 61, a deterioration detection wiring 62 connected to the resistance measurement terminal of the resistance measurement circuit unit 61, and a wiring contact member 63 inserted into a predetermined position of the deterioration detection wiring 62. Composed. The resistance measurement circuit unit 61 measures the electrical resistance value of the deterioration detection wiring 62 and notifies the wireless tag circuit unit 41 of it. The wireless tag circuit unit 41 and the resistance measurement circuit unit 61 may be integrated as one circuit unit.

  The reader 5 on the ground tries to read the wireless tag 4 in the vicinity of the manhole cover 3. Here, when the reader 5 can read the wireless tag 4, that is, when a signal such as an ID transmitted from the wireless tag 4 can be detected, the electrical resistance measured by the sensor unit 6 further transmitted from the wireless tag 4. When the value is read and the electric resistance value is less than the predetermined value, it is determined that the antenna wiring 42 and the deterioration detection wiring 62 are normal. This causes disconnection of the antenna wiring 42, or the concrete of the manhole ceiling 2 that makes the electrical resistance value of the deterioration detection wiring 62 equal to or higher than a predetermined value is not peeled, cracked or deformed, that is, the manhole ceiling 2 is deteriorated. Indicates that no progress has been made.

  On the other hand, if the antenna wiring 42 is disconnected due to peeling, cracking, or deformation in the concrete of the manhole ceiling 2, the wireless tag 4 cannot transmit a signal such as an ID. Alternatively, when the deterioration detection wiring 62 is disconnected or extended, the electrical resistance value becomes equal to or greater than a predetermined value (infinite in the case of disconnection). At this time, the reader 5 determines that the manhole ceiling 2 has deteriorated when the wireless tag 4 cannot be read or the electric resistance value becomes equal to or higher than a predetermined value.

  The antenna wiring 42 and the deterioration detection wiring 62 are formed in the same manner as the antenna wiring 42 shown in the first embodiment. In particular, by forming the deterioration detection wiring 62 with an elastic material, it is possible to detect the change of the electric resistance value sensitively to a minute change of the manhole ceiling 2.

  Further, as in the first embodiment, when a plurality of wireless tags 4 are installed on the manhole ceiling 2, the position of peeling, cracking, or deformation is roughly determined by the ID of the wireless tag 4 that cannot be read, If a plurality of IDs cannot be read, large-sized peeling, cracking, and deformation can be estimated from the positional relationship of the wireless tags 4.

  Hereinafter, a third embodiment of the manhole ceiling deterioration detection method according to the present invention will be described. Unlike the configuration using the antenna wiring 42 of the first embodiment or the antenna wiring 42 and the deterioration detection wiring 62 of the second embodiment, the concrete is peeled off. By using a prevention net, the deterioration of the manhole ceiling 2 is detected by detecting the degree of bending when the concrete piece peels off the peeling prevention net.

  The first method for detecting the degree of bending when a concrete piece is peeled off the peeling prevention net is to attach a hall element to the manhole ceiling 2 and attach a magnet to the wire at the end of the peeling prevention net. A peeling prevention net is attached to the manhole ceiling 2 so as to penetrate the penetration portion.

  When the concrete piece peels off the peeling prevention net, the peeling prevention net and the wire at the end are bent by the weight, and the positional relationship between the magnet attached to the wire and the Hall element changes. The Hall element detects this change in the positional relationship as a change in magnetic flux, and the reader on the ground reads it through the wireless tag.

  A second method for detecting the degree of bending when the concrete piece is peeled off the peeling prevention net is obtained by replacing the relationship between the Hall element and the magnet with a proximity sensor and an iron plate. A proximity sensor is attached to the manhole ceiling 2, an iron plate is attached to the wire at the end of the peeling prevention net, and the peeling prevention net is attached to the manhole ceiling 2 so that the iron plate is close to the proximity sensor.

  When the concrete piece peels off the peeling prevention net, the peeling prevention net and the wire at the end are bent by the weight, and the distance between the iron plate attached to the wire and the proximity sensor changes. This change in distance is detected as a change in the capacitance of a parallel plate capacitor composed of a proximity sensor and an iron plate, and is read by a reader on the ground via a wireless tag.

  Note that the proximity sensor and the iron plate are usually replaced with a switch consisting of two metal pieces that are electrically contacted (ON), and the proximity sensor and the iron plate are in a non-contact (OFF) state due to the bending when the concrete piece is peeled off the peeling prevention net. It is good also as a structure to detect.

DESCRIPTION OF SYMBOLS 1 Manhole body 2 Manhole ceiling 3 Manhole cover 4 Wireless tag 5 Reader 6 Sensor part 41 Wireless tag circuit part 42 Antenna wiring 43 Wiring contact member 61 Resistance measurement circuit part 62 Deterioration detection wiring 63 Wiring contact member

Claims (2)

The concrete surface of the manhole ceiling forming the antenna wiring and degradation sensing wires of the wireless tag, together with forming a wireless tag by connecting the antenna terminal of the antenna wiring and the wireless tag circuit section, of the deterioration detection wire It constitutes a sensor for notifying to said radio tag by measuring the electrical resistance,
The wireless tag transmits an electrical resistance which the sensor is measured against ground reader, together with the reader determines with the electric resistance value received is less than the prescribed value as the deterioration of the manhole ceiling,
A method for detecting deterioration of a manhole ceiling , wherein the reading of the wireless tag from the reader is attempted, and when the reading of the wireless tag becomes impossible due to disconnection of the antenna wiring, the deterioration of the manhole ceiling is determined . In the manhole ceiling deterioration detection method according to claim 1,
The antenna wiring and the deterioration detecting wiring have a shape intersecting at a plurality of positions relative to the closest reinforcing bars in the concrete surface of the manhole ceiling, and diagonally to the nearest reinforcement concrete surface of the manhole ceiling A manhole ceiling deterioration detection method characterized by being arranged so as to intersect with each other .

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