JP2013205937A - Concrete embedded ic tag, and concrete hardened body in which concrete embedded ic tag is embedded - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a concrete embedded IC tag capable of maintaining strength properties of a concrete hardened body and improving a communication performance, and provide a concrete hardened body in which the concrete embedded IC tag is embedded.SOLUTION: A concrete embedded IC tag 1 is embedded in a concrete hardened body A. With an IC tag body 2 of the concrete embedded IC tag 1 as a center, four antennas 3 are arranged in a cross shape.

Description

  The present invention relates to a concrete embedding IC tag embedded in concrete and transmitting identification (ID) information using radio frequency (RF) radio waves, and a concrete hardened body in which the concrete embedding IC tag is embedded. .

  This type of IC tag for embedding concrete has identification information such as the material, date of manufacture, and storage location of the concrete. This information is read by a non-contact type external reading device (hereinafter referred to as a reader) and used for management of the hardened concrete.

  As an IC tag for embedding concrete, for example, the IC tag body is built in the protector so that it does not break or dissolve even if mixed in the manufacturing process of the hardened concrete, and the antenna sensitivity has a wide directivity. In order to be able to do so, there is known one in which an antenna portion is formed in a three-dimensional manner following the curved surface of a concrete embedding IC tag having a three-dimensional shape (see Patent Document 1). The protector is formed of a thermoplastic resin material and has a three-dimensional shape such as a sphere, an ellipsoid, or a polyhedron. The protector is provided with a plurality of recesses on the surface. The protective body is provided with a plurality of recesses, so that concrete sinks into the recesses, and adhesion and affinity with concrete and the like can be obtained. The IC tag main body has a chip shape.

JP 2009-282688 A

  However, in any concrete embedded IC tag, since the concrete is interposed between the concrete embedded IC tag and the reader, the communication performance is greatly reduced. As a countermeasure, a concrete burying IC tag with a built-in antenna is effective. However, depending on the shape of the antenna, the concrete burying IC tag becomes large and the strength property of the hardened concrete body is significantly reduced.

  Accordingly, in view of the above problems, the present invention provides a concrete burying IC tag capable of improving communication performance while maintaining the strength property of the concrete hardened body, and a concrete hardening in which the concrete burying IC tag is embedded. The challenge is to provide a body.

  An IC tag for embedding concrete according to the present invention is characterized by comprising a plurality of antennas extending radially about the IC tag body of a concrete embedding IC tag embedded in concrete.

  According to such a configuration, since the plurality of antennas are arranged radially with the IC tag body as the center, even if the signal wave of the reader is transmitted to the hardened concrete body, The IC tag can receive the signal radio wave efficiently. Therefore, the communication performance between the IC tag main body and the reader can be improved. Moreover, since the antenna shape is radial, the influence on the strength property of the concrete hardened body can be minimized.

  Here, as one embodiment of the present invention, a configuration in which the antenna is arranged in a cross shape can be employed.

  When the number of antennas is small, the communication performance is lowered, and when the number of antennas is large, the strength property of the hardened concrete body is lowered. If the antennas are arranged in a cross shape, both can be effectively realized.

  As another aspect of the present invention, the IC tag main body preferably has a shape that fits in a cube having a side of 10 mm.

  According to this configuration, the influence on the strength property of the hardened concrete body can be further reduced by downsizing the IC tag main body.

  As another aspect of the present invention, the cross-sectional area of each antenna is preferably 0.1 to 0.4 mm, and the length of each antenna is such that the hardened concrete body has a cylindrical shape. It is preferable that it is 40 to 60% of the radius.

  According to these configurations, the size of the entire concrete embedded IC tag to which the antenna is attached can be reduced, so that the strength property of the hardened concrete body can be maintained, the communication performance is excellent, and the shape stability of the antenna is also achieved. Also good.

  The hardened concrete body according to the present invention is characterized in that any of the above-described concrete embedding IC tags is embedded.

  According to such a configuration, the effective radiation area of the antenna is increased and the directivity is improved. As a result, the communication performance is improved, and the hardened concrete body can be managed easily and reliably.

  As described above, according to the present invention, it is possible to improve the communication performance while maintaining the strength property of the concrete hardened body.

The perspective view which shows the IC tag for concrete embedding concerning one Embodiment of this invention. The figure which shows the usage condition of IC tag for concrete embedding of FIG. It is a figure which shows the process of embed | burying the IC tag for concrete embedment of FIG. 1 in a concrete hardening body, (a) is a side view which shows the state which embedded the IC tag main body in the concrete in a concrete formwork, (b) FIG. 3 is a plan view of FIG.

  Hereinafter, an IC tag for embedding concrete according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3 (a) and 3 (b). In the present embodiment, an example of a columnar concrete specimen A (see FIG. 2) having a diameter of 10 cm and a height of 20 cm will be described as an example of a hardened concrete body. The concrete specimen A is arranged and stored in a predetermined storage place.

  The concrete embedding IC tag 1 according to the present embodiment includes an IC tag main body 2 and a plurality of antennas 3, as shown in FIG.

  The IC tag main body 2 is made of a cylindrical body having a diameter of 5 mm and a height of 10 mm, for example. Further, the IC tag main body 2 transmits a nonvolatile memory (not shown) in which information is stored and information in the nonvolatile memory to a non-contact type reader (external reading device) 5 shown in FIG. A communication circuit (not shown) and a power supply circuit (not shown) for generating an operating power supply from the received power are provided. In the nonvolatile memory, for example, identification information such as the material of the concrete specimen A, the date of manufacture, and the case of storage is stored. The information in the nonvolatile memory is read by the reader 5.

  As shown in FIG. 1, the antennas 3,... Are made of a straight bar made of a copper material, and four antennas are provided in this embodiment. And so that the four antennas 3,... Are arranged in a cross shape (radially) on the same plane (so that they are located on lines orthogonal to the center line of the IC tag body 2 and orthogonal to each other), It is mechanically attached to the outer peripheral surface of the IC tag main body 2 by soldering or the like. Accordingly, the four antennas 3 are arranged so as to extend from the center of the concrete specimen A to the peripheral surface.

  When the desired concrete specimen A is selected from the plurality of concrete specimens A that are arranged and stored at the storage location described above, the desired concrete specimen A is selected by a robot arm (not shown). The reader 5 is positioned above. That is, the reader 5 is disposed at a position orthogonal to the surface on which the antennas 3 are arranged in a cross shape. In the present embodiment, the surface on which the antennas 3 are arranged in a cross shape is parallel to the upper surface (upper end surface) of the concrete specimen A, so that the reader 5 is orthogonal to the upper surface of the concrete specimen A. It is arranged at the position to do. Then, as shown in FIG. 2, information stored in the IC tag main body 2 is read by the reader 5. Information read from the IC tag main body 2 is transmitted to the server 6 and collated with the quality control data of the concrete specimen A stored in the server 6.

  Here, the process of embedding the concrete embedding IC tag 1 in the concrete specimen A will be described. For example, as shown in FIG. 3A, a concrete mold 10 is assembled using bolts B and nuts N in order to produce a concrete specimen A. That is, the disc-shaped bottom mold 10a and the pair of semi-cylindrical side molds 10b and 10b are assembled into a bottomed cylindrical shape. The bottomed cylindrical portion 100 has an inner diameter of 10 cm and a height from the bottom mold 10a to the top opening of 20 cm in order to produce a columnar concrete specimen A having a diameter of 10 cm and a height of 20 cm. It has become.

  And after placing concrete C inside the bottomed cylindrical part 100, as shown in FIG.3 (b), the distance from the upper surface opening part of the bottomed cylindrical part 100 to the center position of the IC tag main body 2 For example, a is 5 cm, and the distance b from the inner peripheral surface of the bottomed cylindrical portion 100 to the center position of the IC tag main body 2 is, for example, 5 cm (that is, the center position of the bottomed cylindrical portion 100). Push IC tag 1 with your finger. At this time, the IC of the concrete-embedded IC tag 1 is placed inside the bottomed tubular part 100 so that the surface on which the antennas 3 are arranged in a cross shape is orthogonal to the center of the bottomed tubular part 100. The main body 2 is positioned.

  And the upper surface opening part of the bottomed cylindrical part 100 is sealed by the cover mold (not shown) of the substantially same shape as the bottom mold 10a.

  Then, after 24 to 48 hours have elapsed, when the cover mold, side molds 10b and 10b, and bottom mold 10a are removed, the concrete specimen A in which the concrete embedding IC tag 1 is embedded is completed.

  In this case, the communication performance between the concrete embedding IC tag 1 embedded in the concrete C and the reader 5 is ensured within a range of 30 to 40 cm from the upper surface of the concrete embedding IC tag 1 to the reader 5a of the reader 5. Is done. Moreover, if it is within 45 degrees with respect to the long axis of the concrete specimen A, the concrete burying IC tag 1 and the reader 5 can communicate.

  In addition to preparing one IC tag body 2 without the antenna 3 and preparing a plurality of concrete embedded IC tags 1 having different cross-sectional areas of the antenna 3 and different lengths of the antenna 3, communication performance, concrete specimen (hardened concrete) Body) The influence on the strength of A (the strength against the interface between the concrete matrix and the aggregate) and the shape stability of the antenna 3 inside the concrete specimen A were tested. Regarding the shape stability of the antenna 3, the concrete specimen A is shaved from the surface, and it is determined whether or not the shape of the antenna 3 of the concrete embedding IC tag 1 embedded therein is maintained.

Only IC tag main body 2 of the antenna 3 without sample 1, and in cross-sectional area 0.05 mm ^2, 20 mm of the antenna 3 in length, ... concrete burying IC tag 1 arranged in a cross shape as a sample 2, the cross-sectional A concrete burying IC tag 1 in which antennas 3,... Having an area of 0.1 mm ² and a length of 15 mm are arranged in a cross shape is taken as sample 3, antenna 3 having a cross-sectional area of 0.1 mm ² and a length of 20 mm. ,... Are placed in a cross shape, and a concrete burying IC tag 1 is used as a sample 4, and a concrete burying IC tag 1 having a cross-sectional area of 0.1 mm ² and a length of 30 mm is placed in a cross shape. and sample 5, in the cross-sectional area 0.4 mm ^2, length 15mm antennas 3, ... concrete burying IC tag 1 arranged in a cross shape as a sample 6, is in 0.4 mm ² cross-sectional area and length Concrete buried but 20mm antenna 3, ... and concrete burying IC tag 1 Sample 7 was arranged in a cross shape and in cross-sectional area 0.4 mm ^2, the length placed 30mm antenna 3, ... to the cross-shaped The IC tag 1 for use is a sample 8, and the concrete embedded IC tag 1 in which antennas 3... Having a cross-sectional area of 0.5 mm ² and a length of 20 mm are arranged in a cross shape is a sample 9. And about each of samples 1-9, the communication performance, the influence on the intensity | strength with respect to the concrete test body A, and shape stability are seen.

  The results are shown in Table 1.

The results shown in Table 1 will be described. First, the difference in performance depending on the presence or absence of the antenna 3 and the effective cross-sectional area of the antenna 3 are examined. In the sample 1, the communication performance is seen only with the IC tag main body 2 of the concrete burying IC tag 1 without the antenna 3. Since the antenna 3 is not provided, the communication performance is naturally poor. In the sample 2, the cross-sectional area of the antenna 3 is set to 0.05 mm ² and the length of the antenna 3 is set to 20 mm. In this case, the communication performance is good and there is no influence on the strength of the concrete specimen A. However, since the cross-sectional area of the antenna 3 is as small as 0.05 mm ² , the shape stability of the antenna 3 arranged in a cross shape is poor.

Next, the experiment is performed by changing the length of the antenna 3 to 15 mm, 20 mm, and 30 mm while making the cross-sectional area of the antenna 3 the same as 0.1 mm ² . In the sample 3, the cross-sectional area of the antenna 3 is set to 0.1 mm ² and the length of the antenna 3 is set to 15 mm (shorter than the sample 2). In this case, although the communication performance is poor, there is no influence on the strength of the concrete specimen A, and the shape stability of the antenna 3 arranged in a cross shape is good. In the sample 4, the cross-sectional area of the antenna 3 is set to 0.1 mm ² and the length of the antenna 3 is set to 20 mm. In this case, the communication performance is good, the strength of the concrete specimen A is not affected, and the shape stability of the antenna 3 arranged in a cross shape is good. In the sample 5, the cross-sectional area of the antenna 3 is set to 0.1 mm ² and the length of the antenna 3 is set to 30 mm. In this case, like the sample 4, the communication performance is good, the strength of the concrete specimen A is not affected, and the shape stability of the antenna 3 arranged in a cross shape is good. That is, it is considered that the cross-sectional area of the antenna 3 is preferably 0.1 mm ² and the length of the antenna 3 is 20 to 30 mm.

Next, the experiment is performed by changing the length of the antenna 3 to 15 mm, 20 mm, and 30 mm while making the cross-sectional area of the antenna 3 equal to 0.4 mm ² . In the sample 6, the antenna 3 has a length of 15 mm and is shorter than the samples 4 and 5, so the communication performance is poor. However, there is no influence on the strength of the concrete specimen A, and the shape stability of the antenna 3 arranged in a cross shape is good. In the sample 7, the cross-sectional area of the antenna 3 is set to 0.4 mm ² , and the length of the antenna 3 is set to 20 mm. In this case, the communication performance is good, the strength of the concrete specimen A is not affected, and the shape stability of the antenna 3 arranged in a cross shape is good. In the sample 8, the cross-sectional area of the antenna 3 is set to 0.4 mm ² , and the length of the antenna 3 is set to 30 mm. In this case, the communication performance is good, the strength of the concrete specimen A is not affected, and the shape stability of the antenna 3 arranged in a cross shape is good.

In the sample 9, the cross-sectional area of the antenna 3 is set to 0.5 mm ² and the length of the antenna 3 is set to 20 mm. In this case, the communication performance and the shape stability of the antenna arranged in a cross shape are good, but the strength to the concrete specimen A is affected. That is, even if the cross-sectional area of the antenna 3 is increased by 0.1 mm ² , the concrete specimen A is affected.

From the above results, the cross-sectional area of each antenna 3 is preferably in the range of 0.1 to 0.4 mm ² , and the length of each antenna 3 is in the range of 20 to 30 mm, that is, relative to the radius of the concrete specimen A. A range of 40-60% is considered preferable.

  As described above, according to the present embodiment, the plurality of antennas 3,... Are arranged in a cross shape on the same plane with the IC tag body 2 as the center, so that the concrete specimen (hardened concrete) A Even if it embeds inside, the strength of the concrete specimen (hardened concrete) A can be maintained and the communication performance can be improved.

  In addition, this invention is not limited to the said embodiment, A various change can be made in the range which does not deviate from the summary of this invention.

  For example, in the case of the above embodiment, the four antennas 3,... Are arranged in a cross shape on the same plane with the IC tag main body 2 as the center, but the number of antennas 3,. You may make it arrange | position to. In this case, even if the signal radio wave of the reader 5 is transmitted from multiple directions to the hardened concrete A, the concrete embedding IC tag 1 in the hardened concrete A can receive the signal radio wave efficiently. .

  Moreover, in the case of the said embodiment, although the linear antenna 3 was used, you may use a curved antenna.

  In the case of the above embodiment, the IC tag body 2 is formed of a cylindrical body having a diameter of 5 mm and a height of 10 mm. However, the shape is not particularly limited as long as the shape fits in a cube having a side of 10 mm. For example, any of a sphere and a rectangular parallelepiped may be used.

  In the embodiment, a reader (external reading device) is used. However, a reader / writer (external reading device) capable of both reading and writing may be used. In that case, information can be written into the non-volatile memory of the IC tag body 2 using a reader / writer (external reading device).

  In the embodiment, the radio frequency is not particularly limited, but the LF (125 kHz) band, HF (13.56 MHz) band, UHF band, and EHF (2.4 GHz) band can be used.

  DESCRIPTION OF SYMBOLS 1 ... IC tag for embedding concrete, 2 ... IC tag main body, 3 ... Antenna, 5 ... Reader (external reader), 6 ... Server, A ... Concrete specimen (hardened concrete)

Claims (6)

  A concrete embedding IC tag comprising a plurality of antennas extending radially about an IC tag main body of a concrete embedding IC tag embedded in concrete.   The IC tag for embedding concrete according to claim 1, wherein the antenna is arranged in a cross shape.   The IC tag for embedding concrete according to claim 1 or 2, wherein the IC tag main body has a shape that fits in a cube having a side of 10 mm. 4. The concrete embedded IC tag according to claim 1, wherein a cross-sectional area of each antenna is 0.1 to 0.4 mm ² .   The IC tag for concrete embedment according to any one of claims 1 to 4, wherein each antenna has a length of 40 to 60% with respect to a radius when the hardened concrete body has a cylindrical shape.   A hardened concrete body, wherein the concrete embedding IC tag according to any one of claims 1 to 5 is embedded.

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