JP2008137284A - Concrete product, its manufacturing and management method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a management method of a concrete product which enables simple, correct and secure management of various data such as history pertaining a manufacturing process on the concrete product itself and concrete forming, hence easy application of the data to inventory/shipping management etc. and further, enables tracing investigation to be conducted later based on the data as application to traceability, the concrete product, and its manufacturing method. <P>SOLUTION: The concrete product is an L shaped retaining wall, and has such a configuration that a thin sheet-like IC tag 3 is embedded near the forming surface of a concrete body 1 so as to allow the antenna surface of an antenna part 13 of the IC tag 3 to be in parallel with the side surface 1a of the concrete body 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a concrete product, a manufacturing method thereof, and a management method thereof. More specifically, when a concrete product is managed, there is no risk of human error, and management is performed simply, accurately, reliably, and efficiently. Further, the present invention relates to a concrete product capable of managing the ready-mixed concrete used for placing the concrete product, a manufacturing method thereof, and a management method thereof.

  Conventionally, when manufacturing concrete products such as L-type retaining walls, box culverts, precast concrete plates, U-shaped grooves, and fume pipes, for example, when placing concrete, a tag is attached to the formwork to be placed. Alternatively, management is performed by writing various numbers such as lot numbers, various symbols, etc. on the formwork with paint. Moreover, when demolding a concrete product, the concrete product is managed by writing various numbers such as lot numbers, various symbols, etc. on the concrete product with ink or the like.

In addition, the management of concrete products such as manufacturing, inventory, and shipping is performed by computer management and ledger management using various numbers such as lot numbers and various symbols of the concrete products described above.
By the way, in a factory that manufactures concrete products, since the types and production amounts of the concrete products to be manufactured are very large, for example, when performing computer management, when managing production, inventory, shipping, etc. , Manual data entry is required. However, since manual data input itself is a very labor-intensive operation, human error such as erroneous input is likely to occur, and management accuracy may be lacked.

Moreover, in the conventional concrete product, since the space on description is limited, as a number and the symbol which recognizes this product, it is limited to a manufacturing date, a kind of product, a manufacturing factory, a composition of concrete, At present, detailed data such as quality (grade), placing conditions, curing conditions, etc. are not described.
For this reason, when concrete products have been delivered, deterioration, defects, etc. have occurred over the years, the information described in the concrete products with deterioration or defects is limited to the date of manufacture, product type, and manufacturing factory. Therefore, it takes time to trace, and in some cases, tracing becomes difficult, and it is very difficult to elucidate the cause of deterioration or malfunction.
These symbols that identify concrete products such as production date, product type, and manufacturing plant are not linked to detailed data related to placement, such as concrete composition, quality (grade), placement date and time, curing conditions, etc. There were also problems in quality control of concrete products.

In addition, when a concrete product is installed for a long time, the symbols written on the product disappear or are contaminated, which makes it difficult to visually identify the product.
In this way, it is difficult to obtain information on concrete of concrete products, and it is difficult to investigate and grasp, and in reality, it is not until natural disasters such as earthquakes, deterioration due to neutralization, salt damage, freezing and thawing, etc. Often, it turns out that the original concrete quality has not been ensured. In this case, it is conceivable that regular quality concrete was not placed on the concrete product. However, with the management method described above, it is difficult to track the concrete information placed on the concrete product later. There are many cases, and in some cases, it is possible to tamper with data that is convenient.

Therefore, in order to solve such problems, there has been proposed a concrete product to which an RFID (Radio Frequency Identification) system that is a non-contact wireless communication system is applied (Patent Document 1).
In this concrete product, an RFID data carrier (so-called IC tag) is installed at a position retracted inward from the outer peripheral surface of a concrete building material made of concrete, such as a fume pipe, with the antenna directing direction facing the outer peripheral surface. The data of the RFID data carrier is written and read by wireless communication between the RFID data carrier and the RFID device provided outside the concrete product.
This concrete product is obtained by attaching an RFID data carrier to a holding portion of a dedicated RFID data carrier installation jig, and then, before solidifying the fluid concrete, into the concrete product form in which fluid concrete has already been poured, The data carrier is inserted into the installation jig, embedded and fixed in the concrete, and then the fluidized concrete is solidified and demolded.
JP 2000-91963 A

Incidentally, the concrete product to which the above-described conventional RFID system is applied also has the following problems.
(1) Since the RFID data carrier is inserted into the fluidized concrete after being attached to the holding portion of the dedicated RFID data carrier installation jig, a dedicated RFID data carrier installation jig is required, and It takes time and effort for installation, and the work becomes complicated.

(2) Since the RFID data carrier is embedded in the concrete together with the dedicated RFID data carrier installation jig, the RFID data carrier installation jig also remains in the concrete product as a foreign substance. To affect.
(3) When the RFID data carrier is simply embedded in a concrete product, it is difficult to specify the position where the RFID data carrier is embedded. Therefore, even if the signal cannot be detected or the signal can be detected, the sensitivity is high. There are problems such as too low. For this reason, in the above-described conventional RFID system, it has been proposed to put out one end of the RFID data carrier installation jig on the surface of the concrete product. In such a structure, the above-mentioned ( In addition to the problems 1) and (2), there are problems in appearance.

  The present invention has been made to solve the above-described problems, and can easily, accurately, and reliably manage various data such as the history of the manufacturing process related to the concrete product itself and concrete placement. Therefore, it can be easily used in inventory, shipping management, etc., and can be followed up later and utilized for traceability, its manufacturing method and its management It aims to provide a method.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that only a thin plate-like non-contact communication medium is used without using a conventional installation jig dedicated to the non-contact communication medium. By embedding in the vicinity of one surface of the concrete body, the position of the non-contact communication medium in the concrete body is always constant, so that the management of the concrete product can be performed simply, accurately and reliably, and the management work As a result, the present invention has been completed.

That is, the concrete product of the present invention is characterized in that a thin plate-like non-contact communication medium is embedded in the vicinity of one surface of a concrete body.
In this concrete product, it is easy to specify the position of the non-contact communication medium embedded in the concrete body by embedding a thin plate-like non-contact communication medium in the vicinity of one surface of the concrete body. Thereby, it becomes possible to easily detect a signal from the non-contact communication medium with high sensitivity, and it becomes possible to easily, accurately and reliably manage the concrete product.
Moreover, since only the thin plate-like non-contact communication medium is embedded in the concrete body, a jig or the like for fixing the non-contact communication medium is not left in the concrete body. There is no risk that the communication medium will affect the strength of the concrete product.

This non-contact communication medium is also related to placement, such as concrete product production date, type, production factory, production lot, concrete lot number, composition, quality (grade), placement date, curing conditions, etc. Because it is possible to read / write information on concrete products including simple data, even if deterioration or defects occur over time after concrete products are delivered, the cause of deterioration or defects can be easily It is possible to elucidate.
In addition, even if these pieces of information have been installed for a long time, there is no risk of loss or deterioration of the information.

  The concrete product of the present invention is characterized in that the non-contact communication medium is embedded in the vicinity of the placing surface of the concrete body and in the vicinity of one surface other than the placing surface of the concrete body. .

The concrete product of the present invention is characterized in that the position of one end of the non-contact communication medium substantially coincides with the placement surface of the concrete body.
In this concrete product, the position of the non-contact communication medium in the concrete becomes constant by making the position of one end of the non-contact communication medium substantially coincide with the placement surface of the concrete body. Thereby, when reading information from this non-contact communication medium, it becomes extremely easy to specify the position of the non-contact communication medium, and it becomes possible to manage the concrete product more simply, accurately and reliably.

The concrete product of the present invention is characterized in that the non-contact communication medium is attached to a reinforcing bar positioning member provided in the concrete body.
In this concrete product, the position of the non-contact communication medium in the concrete body is fixed by attaching the non-contact communication medium to the reinforcing member positioning member provided inside the concrete body. When reading information, it is very easy to specify the position of the non-contact communication medium. Therefore, it becomes possible to manage concrete products more easily, accurately and reliably.

The concrete product of the present invention is characterized in that the distance between the antenna portion of the non-contact communication medium and the one surface is within 3 cm.
In this concrete product, when the distance between the antenna portion and the one surface is within 3 cm, the sensitivity of the antenna at the time of reading information becomes higher, and the reliability is improved. Therefore, it becomes possible to detect the signal from the non-contact communication medium with higher sensitivity and more easily, and it becomes possible to manage the concrete product more simply, accurately and reliably.

The concrete product of the present invention is characterized in that the non-contact communication medium has a length of 150 mm or less and a width of 100 mm or less.
In this concrete product, by setting the shape of the non-contact communication medium within the above range of values, there is no possibility that the non-contact communication medium affects the strength of the concrete body. Moreover, when embedding a non-contact communication medium, the opportunity to contact the aggregate in the ready-mixed concrete is reduced, and the embedding work is simplified.

The concrete product of the present invention is characterized in that the non-contact communication medium is provided with an integrated circuit capable of writing / reading information and the antenna unit on a substrate made of a flexible organic polymer. And
In this concrete product, by using a substrate made of an organic polymer having flexibility, the shape of the non-contact communication medium follows the deformation of the ready-mixed concrete even when the ready-mixed concrete is cured. There is no risk of cracks or gaps between the contact communication medium. Thereby, there is no possibility that the strength of the concrete body is lowered, and the concrete body has a desired mechanical strength.

The concrete product of the present invention is characterized in that the integrated circuit and the antenna portion are covered with a film made of an organic polymer.
In this concrete product, at least the integrated circuit and the antenna part are covered with a film made of an organic polymer, so that even when the concrete is cured, the integrated circuit and the antenna part are protected by the organic polymer, and the concrete is hardened. There is no risk of causing damage.

The concrete product of the present invention is characterized in that the information recorded on the non-contact communication medium is identification information of the concrete body.
In this concrete product, the information recorded in the non-contact communication medium is used as identification information of the concrete body, and by reading these information in a non-contact manner using a non-contact communication medium reader, the concrete composition, Characteristics, history, etc. can be easily known.

  In the method for producing a concrete product according to the present invention, ready-mixed concrete is placed in a form of a concrete product, and then a non-contact communication medium in the form of a thin plate is embedded in the ready-made concrete from the ready-made face of the ready-mixed concrete. Then, the ready-mixed concrete is cured and then demolded to obtain a concrete product.

  In this concrete product manufacturing method, a concrete product that can easily detect signals from a non-contact communication medium with high sensitivity, can be managed easily, accurately and reliably, and has no risk of lowering the concrete strength. Can be manufactured easily and inexpensively.

  In the method for producing a concrete product of the present invention, a non-contact communication medium is attached to a positioning member provided on the reinforcing bar, and then the reinforcing bar to which the non-contact communication medium is attached is placed in a formwork of the concrete product. The ready-mixed concrete is placed in the mold, and then the ready-mixed concrete is hardened and then demolded to obtain a concrete product.

  In this concrete product manufacturing method, a signal from a non-contact communication medium can be easily detected with high sensitivity, management can be performed simply, accurately and reliably, and there is no risk of the concrete strength being lowered. The product can be easily and inexpensively manufactured.

  The method for managing a concrete product of the present invention reads information recorded on a non-contact communication medium of the concrete product in a non-contact manner using a non-contact communication medium reader, and based on the read information, It is characterized by management.

  In this concrete product management method, by using a non-contact communication medium reader, the information recorded on the non-contact communication medium of the concrete product is read in a non-contact manner, and management is performed based on the read information. It becomes possible to quickly obtain a wide range of information about concrete products, and it becomes possible to manage concrete products simply, accurately and reliably.

  The method for managing a concrete product according to the present invention is such that the non-contact communication medium reading device performs both reading of information from the non-contact communication medium and writing of information to the non-contact communication medium. It is a communication medium reading / writing device.

  In this concrete product management method, a portable non-contact communication medium reading device that performs both reading of information from the non-contact communication medium and writing of information to the non-contact communication medium is performed by the non-contact communication medium reading device. By using the writing device, it becomes possible to know a wide range of information on concrete products on the spot and in real time.

According to the concrete product of the present invention, since the thin plate-like non-contact communication medium is embedded in the vicinity of one surface of the concrete body, it is easy to specify the position of the non-contact communication medium. The signal from the medium can be easily detected with high sensitivity, and the concrete product can be managed simply, accurately and reliably.
Further, since a jig or the like for fixing the non-contact communication medium does not remain in the concrete body, there is no possibility that the non-contact communication medium affects the strength of the concrete product.

  This non-contact communication medium is also related to placement, such as concrete product production date, type, production factory, production lot, concrete lot number, composition, quality (grade), placement date, curing conditions, etc. Because it is possible to read / write information on concrete products including simple data, even if deterioration or defects occur over time after concrete products are delivered, the cause of deterioration or defects can be easily There is no risk of loss or deterioration of information.

  According to the method for producing a concrete product of the present invention, ready-mixed concrete is placed in a mold of a concrete product, and then a thin plate-like non-contact communication medium is introduced into the ready-made concrete from the surface of the ready-mixed concrete. Then, the ready-mixed concrete is cured and then demolded, so that the concrete product of the present invention can be manufactured by the same manufacturing method as the conventional concrete product.

  According to another method for producing a concrete product of the present invention, a non-contact communication medium is attached to a positioning member provided on the rebar, and then the rebar to which the non-contact communication medium is attached is placed in a concrete product formwork. Since the ready-mixed concrete is placed in the formwork, and then the ready-mixed concrete is hardened and then demolded, the reinforced concrete product of the present invention is manufactured by the same manufacturing method as the conventional reinforced concrete product. be able to.

  According to the concrete product management method of the present invention, the information recorded in the non-contact communication medium of the concrete product is read in a non-contact manner using a non-contact communication medium reader, and the concrete product is read based on the read information. Since the management is performed, a wide range of information on the concrete product can be quickly obtained, and the management of the concrete product can be performed simply, accurately and reliably.

The best mode for carrying out the concrete product of the present invention, its manufacturing method and its management method will be described.
These forms are specifically described for better understanding of the gist of the invention, and do not limit the present invention unless otherwise specified.

“First Embodiment”
FIG. 1 is a perspective view showing an L-shaped retaining wall that is a concrete product according to the first embodiment of the present invention, FIG. 2 is a sectional view of a region A in FIG. A lattice-like reinforcing bar arranged inside the concrete body 1 and along the outer side surface 1a, 3 is near the placement surface 1b of the concrete body 1 and near the surface other than the placement surface 1b of the concrete body 1 It is a thin plate-like IC tag (non-contact communication medium) embedded in. The IC tag 3 is embedded in a state where the antenna surface of the antenna portion is parallel to the outer side surface (one surface) 1a of the concrete body 1 or inclined with respect to the side surface 1a.

  Considering the sensitivity and stability at the time of writing / reading of the IC tag 3, it is preferable that the antenna surface of the antenna portion of the IC tag 3 be parallel to the outer side surface 1 a of the concrete body 1. When the IC tag 3 is embedded in an inclined state with respect to the side surface 1a, the angle between the antenna surface and the side surface 1a is 45 ° in consideration of the sensitivity and stability during writing / reading of the IC tag 3. Is preferably within 30 °, and more preferably within 30 °.

3 is a perspective view showing the IC tag 3, and FIG. 4 is a cross-sectional view taken along the line BB of FIG. 3. In these figures, for ease of explanation, individual thicknesses, aspect ratios, and the like are shown. It has been changed from the actual one.
The IC tag 3 has a thin plate shape, an IC (integrated circuit) 12 capable of writing / reading information on a substrate 11 made of a flexible organic polymer, and around the IC 12. An oblong and spiral antenna portion 13 is provided so as to surround this, and the substrate 11, the IC 12 and the antenna portion 13 are entirely covered with a film 14 made of an organic polymer such as a laminate film. Has been.
The IC tag 3 may be either an active type or a passive type as long as it is thin. However, the IC tag 3 can be easily formed into a predetermined thin plate, and can be left in the concrete body 1 for a long time. An unnecessary passive type is preferable.

The substrate 11 may be any substrate as long as it has a function as a support for supporting the IC 12 and the antenna unit 13, and is preferably an organic polymer film in that it has moderate flexibility and is easy to handle. As the organic polymer film, for example, a plastic film such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC) is preferably used, and in particular, mechanical strength. A polyethylene terephthalate (PET) film is preferred because of its excellent thermal stability.
The shape of the substrate 11 may be set in accordance with the shapes of the IC 12 and the antenna unit 13, but a rectangle is preferable because it is easy to handle when embedded in concrete.

  The IC 12 only needs to be able to write / read information on the L-type retaining wall. However, in order to prevent falsification of information, the already written information cannot be erased or overwritten. It is preferable that only the additional portion is written.

The following items can be listed as information on the L-type retaining wall.
(1) Type of L-shaped retaining wall, production date, production location (factory line, etc.), production lot number, delivery destination, delivery date, other specifications, etc. (2) Concrete type, production date, production location (factory Line), production lot number,
(3) Concrete quality (slump, air content, chloride ion content, kneading temperature, etc.)
(4) Concrete raw materials (aggregate production area, type, density, etc.)
(5) Concrete composition (6) Compressive strength (test date, test data, etc.)
(7) Other items determined by specifications, etc.

The antenna unit 13 is formed by etching a metal thin film or a metal foil into an ellipse having a predetermined size and a spiral shape.
The film 14 covers the substrate 11, the IC 12, and the antenna unit 13 as a whole and protects them from the external environment, and those having good adhesion to concrete have an effect on the properties such as the mechanical strength of the L-type retaining wall. For example, a laminate film is preferable. In particular, a laminate film having a multilayer structure composed of a plurality of layers is preferable in terms of high strength.
As this laminate film, for example, a plastic film such as polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polystyrene (PS), polycarbonate (PC) is preferably used, and in particular, mechanical strength and heat. A polyethylene terephthalate (PET) film is preferred because of its excellent stability.

The IC tag 3 preferably has a length of 150 mm or less and a width of 100 mm or less, more preferably a length of 100 mm or less and a width of 70 mm or less, more preferably a length of 90 mm or less and a width of 60 mm or less. It is. The thickness is preferably within 3 mm, more preferably within 2 mm, and even more preferably within 1 mm.
When the size of the IC tag 3 is within the above range, the characteristics such as the mechanical strength of the L-type retaining wall are not affected. Furthermore, when the IC tag 3 is inserted, the chance of contact with the aggregate in the concrete is reduced, and the embedding work is simplified.
Here, the size of the IC tag 3 is the size excluding the film 14 when the film 14 is not covered, and the size of the concrete body 1 including the film 14 when the film 14 is covered. This is the size of the part embedded inside.

As the IC tag 3, since the ready-mixed concrete placed in the mold contains moisture and is alkaline, it is necessary to use an IC tag that does not deteriorate due to moisture or alkali contained in the concrete during the period of use. For this reason, it is necessary to perform waterproofing and alkaliproof treatment as necessary.
Furthermore, in the factory which manufactures a concrete product, since steam curing is performed after concrete placement, it is preferable that it is excellent not only in water resistance but in heat resistance.

For example, the whole is preferably covered with a film 14 made of an organic polymer such as a laminate film. The film 14 is preferably one having good adhesion to concrete so as not to affect the properties such as the mechanical strength of the L-shaped retaining wall.
The integrated substrate 11, IC 12, and antenna unit 13 may be housed in a plastic bag or a sealed container.
Further, as the substrate 11, the IC 12 and the antenna unit 13, those having durability against moisture and alkali contained in concrete, moisture entering the concrete from the outside during curing, and the like may be used.
Instead of the IC tag 3, an IC card (non-contact communication medium) or the like may be used as necessary.

Next, the manufacturing method of the L-shaped retaining wall of this embodiment is demonstrated based on FIGS.
First, the molds 21 to 24 are assembled into the shape of an L-shaped retaining wall, a predetermined ready-mixed concrete 25 is placed in the formwork 21 to 24, and the IC tag 3 is attached from the placement surface 25a of the ready-mixed concrete 25. The IC tag 3 is embedded in the ready-mixed concrete 25 so that the antenna portion 13 is positioned in the vicinity of the placement surface 25 a and in the vicinity of the inner surface 21 a of one mold 21.
Here, the antenna portion 13 of the IC tag 3 is embedded in the ready-mixed concrete 25 in a state parallel to the inner surface 21a of the mold 21 or inclined with respect to the inner surface 21a.

Considering the sensitivity and stability at the time of writing / reading of the IC tag 3, it is preferable that the antenna surface of the antenna portion 13 of the IC tag 3 is parallel to the inner surface 21 a of the mold 21.
Further, when the antenna surface of the antenna portion 13 of the IC tag 3 is embedded in an inclined state with respect to the inner surface 21a, the antenna portion of the IC tag 3 is considered in consideration of sensitivity and stability during writing / reading of the IC tag 3. The 13 antenna surfaces are preferably within 45 ° with respect to the inner surface 21a, and more preferably within 30 °.

In the IC tag 3, the entire antenna surface of the antenna portion 13 is preferably located within an area within 3 cm from the inner surface 21a (the surface of the concrete body) of the mold 21, and more preferably within an area within 1 cm. Is located. That is, it is preferable that the entire antenna surface of the antenna portion 13 of the IC tag 3 is located within a region within 3 cm, preferably within a region within 1 cm from the side surface of the concrete body 1.
By setting the embedding position of the entire antenna surface of the IC tag 3 to an area within 3 cm from the inner surface 21a of the mold 21, the antenna surface of the IC tag 3 can be either three-dimensional with respect to the inner surface 21a of the mold 21. Even when tilted in the direction, the sensitivity and stability when writing / reading the identification information are improved.

The embedded depth of the IC tag 3 only needs to be fixed when the ready-mixed concrete 25 placed in the molds 21 to 24 is cured. Further, the depth to be embedded only needs to be embedded in the IC tag 3 so as not to be affected by damage or the like, and the position of one end portion of the IC tag 3 may be substantially coincident with the placement surface.
Further, if embedded too deeply, the IC tag 3 may be damaged, deteriorated, and the stability of the signal may be lowered. Therefore, if necessary, the upper end of the IC tag 1 or the upper end of the antenna unit 13 is hit. It is preferable to embed up to a depth of about 5 mm to 10 mm from the installation surface 25a.
By setting the embedded depth of the IC tag 3 within the above range, the IC tag 3 is prevented from being damaged, deteriorated, and the stability of the signal is improved.

In order to make this IC tag 3 easily embedded in the placement surface 25a of the ready-mixed concrete 25, when the IC tag 3 is embedded to a predetermined depth, only the end portion of the substrate 11 protrudes from the placement surface 25a. Only the substrate 11 can be lengthened.
At this time, if the end of the stretched substrate 11 is marked in accordance with the embedding depth, the IC tag 3 can be easily embedded to a predetermined depth without variation for each L-type retaining wall.
The end portion of the substrate 11 protruding from the placement surface 25a can be easily cut if necessary after the ready-mixed concrete 25 is cured.

  In addition, when the IC tag 3 is used by being wrapped, a portion only for lapping so that a portion only for lapping protrudes from the placement surface 25a when the IC tag 3 is embedded to a predetermined depth from the placement surface 25a. Can also be kept long. Also here, if the stretched wrapping portion is marked according to the embedding depth, the IC tag 3 can be easily embedded to a predetermined depth without variation for each L-type retaining wall.

The wrapping portion protruding from the placement surface 25a can be easily cut if necessary after the ready-mixed concrete 25 is cured, and a notch may be formed so as to be easily cut.
The case of using an IC tag in a bag or other container is the same as in the case of wrapping.

Information regarding predetermined ready-mixed concrete may be written in advance on the IC tag 3 before placing, or information regarding predetermined ready-mixed concrete may be written after the IC tag 3 is embedded in the ready-mixed concrete 25. Good. In addition, a predetermined ID may be written in the IC tag 3 in advance, or the predetermined ID may be written after the IC tag 3 is embedded in the ready-mixed concrete 25. This information includes ID information, information about the used concrete, and the L-type retaining wall to be manufactured.
Next, the ready-mixed concrete 25 is cured by steam curing at a predetermined temperature for a predetermined time, and then demolded to obtain an L-shaped retaining wall of the present embodiment.

Information recorded on the IC tag 3 of the L-type retaining wall is read in a non-contact manner using an IC tag reader / writer (non-contact communication medium writing / reading device), and management of the L-type retaining wall is performed based on the read information. I do.
The IC tag reader / writer is not particularly limited but is preferably portable. The reason is that information can be easily written / read at a factory manufacturing site or the like without moving the L-shaped retaining wall, which is a heavy object.

In particular, a large number of L-type retaining walls are manufactured and shipped every day at manufacturing plants. For this reason, it is difficult to move the L-shaped retaining wall, which is a heavy object, from the manufacturing place or the storage place, read the information of the IC tag 3 and manage the L-shaped retaining wall. In such a case, by using a portable IC tag reader / writer, the L-type retaining wall can be easily managed on site.
In addition, after the L-type retaining wall is actually installed, it is necessary to read the information written on the IC tag 3 at the installation site or add new information, so a portable IC tag reader / writer is installed. They need to be brought to the site and read / write without contact.

  The distance at which the information written on the IC tag 3 can be read without contact depends on the size of the antenna of the IC tag reader / writer. However, when a portable IC tag reader / writer is used, one with a very large antenna cannot be used. Therefore, in order to bring the IC tag reader / writer close to the IC tag 3 embedded in the L-type retaining wall, it is possible to immediately find out where the IC tag 3 is embedded in the L-type retaining wall. This is very important.

In this L-type retaining wall, the IC tag 3 is embedded in the vicinity of the placing surface 1b of the concrete body 1 so that the antenna portion 13 is parallel to the side surface 1a of the concrete body 1. It can be easily inferred whether the IC tag 3 is embedded around.
In addition, when writing data to the IC tag 3, it is preferable that the written data cannot be corrected and only data can be added in order to prevent falsification of the data.

  As described above, the information recorded on the IC tag 3 of the L-type retaining wall is read in a non-contact manner using a portable IC tag reader / writer, and the L-type retaining wall is managed based on the read information. A wide range of information regarding individual L-shaped retaining walls can be quickly obtained, and management of individual L-shaped retaining walls can be performed simply, accurately and reliably.

  Next, as an application example of the L-type retaining wall management method of the present invention, two management methods will be given and described.

(Management method 1)
(1) Write predetermined information on the L-type retaining wall and ready-mixed concrete to the IC tag via the IC tag reader / writer. This information may be written before or after embedding in the ready-mixed concrete.
a) Predetermined information about the L-type retaining wall and ready-mixed concrete is input to the IC tag reader / writer and written to the IC tag.
b) Predetermined information about the L-type retaining wall and ready-mixed concrete is input to a server, a personal computer, etc., transmitted to an IC tag reader / writer wirelessly, etc., and written to the IC tag.
(2) The IC tag reader / writer reads the IC tag information and ships it.
(3) The IC tag information is read at the delivery destination, and it is confirmed whether or not the delivery is correct.
(4) After installing this L-shaped retaining wall at a predetermined position, IC tag reader / writer reads information on the IC tag at the time of inspection and repair.

According to this management method 1, the following effects can be achieved.
(1) Work such as writing characters, numbers, etc. on the mold becomes unnecessary, and work efficiency can be improved. In addition, the inconsistency between concrete and form number due to mistakes is eliminated, and the reliability of management is improved.
(2) When the formwork is removed, there is no need to transfer characters, numbers, etc. to the L-type retaining wall, and work efficiency can be improved. In addition, the inconsistency between the L-type retaining wall and the concrete due to a transcription mistake is eliminated, and the management reliability is improved.

(3) With an IC tag reader / writer, a predetermined L-shaped retaining wall can be easily, accurately and reliably identified.
(4) If the IC tag reader / writer and server, personal computer, etc. are connected wirelessly, etc., concrete data (quality, material, etc.) placed on a predetermined L-shaped retaining wall via ID, data of this L-shaped retaining wall (Production date, production factory, production lot number, etc.) can be easily confirmed.
(5) Data related to information can be easily stored and written.

(6) Since all necessary data is contained in the IC tag, the portable IC tag reader / writer can directly read information on the L-type retaining wall from the IC tag at the site. Therefore, it is possible to immediately grasp necessary information on the spot without exchanging information with a server or the like.
(7) Since the IC tag in which information is written is embedded in the L-type retaining wall, necessary data can be obtained on-site even after a long period of time without spending time and money on data management. As a result, long-term quality traceability can be achieved.

(Management method 2)
(1) Preserved information on ready-mixed concrete on a server, personal computer, etc.
(2) Predetermined information about the L-type retaining wall is stored in a server, a personal computer or the like.
(3) Write predetermined information regarding ready-mixed concrete, predetermined information regarding L-shaped retaining walls, and ID numbers corresponding to the information to the IC tag via the IC tag reader / writer. This information may be written before or after embedding in the ready-mixed concrete.

(4) The IC tag reader / writer reads the IC tag information and ships it.
(5) The IC tag information is read at the delivery destination to check whether the delivery is correct.
(6) After installing this L-shaped retaining wall at the specified position, during inspection and repair, the IC tag reader / writer reads the IC tag information and stores it on a server, personal computer, etc. that stores information on ready-mixed concrete and L-shaped retaining walls. By accessing, it is possible to know each information about the ready-mixed concrete and the L-shaped retaining wall based on the ID number.
This management method 2 can also achieve the same effects as the management method 1 described above.

As described above, according to the L-type retaining wall of the present embodiment, the IC tag 3 capable of writing / reading various data is identified on the L-type retaining wall with a predetermined embedding direction, embedding position, Since the embedding is performed at the embedding depth, it is possible to prevent an artificial error related to identification of the L-type retaining wall, and it is not necessary to describe the recognition information on the L-type retaining wall, thereby improving work efficiency. it can.
By writing the quality data of the placed concrete into the IC tag 3 embedded in the L-shaped retaining wall, the quality control of the L-shaped retaining wall can be more reliably performed.

In addition, when this L-type retaining wall is used for a long time, the traceability of the L-shaped retaining wall can be implemented accurately and in a short time by reading various data described in the IC tag 3.
Further, since the data of the IC tag 3 can be read by a portable IC tag reader / writer, information can be easily obtained even at a construction site or an installation position.
As described above, identification, maintenance, and management of the L-type retaining wall can be performed easily, accurately, and reliably, and it can be used in various fields such as manufacturing / inventory / shipment management and traceability. Big.

“Second Embodiment”
FIG. 7 is a cross-sectional view showing an L-shaped retaining wall that is a concrete product of the second embodiment of the present invention, and the L-shaped retaining wall of the present embodiment is different from the L-shaped retaining wall of the first embodiment. In the L-type retaining wall of the first embodiment, the thin plate-like IC tag 3 is directly embedded in the vicinity of the placing surface 1b of the concrete body 1, whereas the L-shaped retaining wall of the present embodiment. The thin plate-like IC tag 3 is attached to a spacer (positioning member) 31 for maintaining a constant distance between the reinforcing bar 2 and the inner surface 21a of the mold 21 on which the ready-mixed concrete is placed.

  The spacer 31 is provided so that the rebar 2 does not touch the inner surface of the mold when placing ready-mixed concrete on the mold, as shown in FIG. 7 and FIG. A fixing portion 32 that is fitted and fixed in a joint portion of the disposed reinforcing bars 2, a pair of plate-like positioning portions 33 and 33 that extend outward in the horizontal direction from the fixing portion 32, and tips of the positioning portions 33 and 33 And the plate-like connecting part 34 that connects the vicinity of the parts and keeps the distance between the positioning parts 33 and 33 constant. These positioning parts 33 and 33 connect the reinforcing bars 2 into the molds 21 and 22. It is possible to keep the distance between the reinforcing bar 2 and the inner surface 21a constant by bringing the inner surface 21a into contact with the inner surface 21a of the mold frame 21 when it is arranged.

The IC tag 3 is attached to the outer surface of the connecting portion 34 so that the antenna portion is parallel to one inner surface 21 a of the molds 21 and 22 of the concrete body 1. Thereby, the embedding position of the IC tag 3 from the surface of the ready-mixed concrete is also uniquely determined.
The L-type retaining wall is configured such that the IC tag 3 is attached to the spacer 31 at the joint of the reinforcing bar 2, and then the reinforcing bar 2 to which the IC tag 3 is attached is disposed in the molds 21 and 22 of the L-type retaining wall, Next, it is obtained by placing ready-mixed concrete in the molds 21 and 22 and demolding after curing.

Also in the L-shaped retaining wall of this embodiment, the same effect as the L-shaped retaining wall of the first embodiment can be obtained.
In addition, since the IC tag 3 is attached to the outer surface of the connecting portion 34 of the spacer 31 provided on the reinforcing bar 2, the attachment position of the IC tag 3 is fixed, and moves when placing the ready-mixed concrete. There is no fear of changes.
In addition, since the IC tag 3 is attached to the connection portion 34 of the spacer 31, a new jig or the like for attaching the IC tag is not required, and the IC tag can be easily attached by a human hand.

“Third Embodiment”
FIG. 9 is a cross-sectional view showing an L-shaped retaining wall that is a concrete product of the third embodiment of the present invention, and the L-shaped retaining wall of the present embodiment is different from the L-shaped retaining wall of the second embodiment. Is different in the shape of the spacer.

  As shown in FIG. 10, the spacer 41 includes a small ring portion 43 in which an incision 42 for fitting is formed along the axis, ribs 44, 44,... Radially extending outward from the small ring portion 43, The ribs 44, 44,... Are connected to each other in the vicinity of the tip end portion thereof, and a large ring portion 46 is formed along the axis with a fitting notch 45. The ribs 44, 44 ,... Can keep the distance between the reinforcing bar 2 and the inner surface 21a constant by bringing the reinforcing bar 2 into contact with the inner surface 21a of the mold 21 when the reinforcing bar 2 is placed in the molds 21 and 22. It is.

The IC tag 3 is attached to the outer peripheral surface of the large ring portion 46 between the ribs 44 of each of the plurality of spacers 41 (four in FIG. 10) fitted in the reinforcing bar 2 so that the antenna portion of the concrete body 1 is attached. The inner surface 21 a of the mold 21 is parallel to the inner surface 21 a. Thereby, the embedding position of the IC tag 3 from the surface of the ready-mixed concrete is also uniquely determined.
The L-type retaining wall is fitted with a predetermined number of spacers 41 at a predetermined position of the reinforcing bar 2, for example, in the vicinity of the connection portion, and the large ring portion 46 between the ribs 44, 44 of these spacers 41, 41,. The IC tag 3 is attached to the outer peripheral surface, and then the reinforcing bar 2 to which the IC tag 3 is attached is placed in the molds 21 and 22 of the L-type retaining wall, and then ready-mixed concrete is placed in the molds 21 and 22. It is obtained by placing and then curing and demolding.

Also in the L-shaped retaining wall of this embodiment, the same effect as the L-shaped retaining wall of the second embodiment can be achieved.
In addition, since a predetermined number of spacers 41 are fitted into the reinforcing bar 2 and the IC tag 3 is attached to the outer peripheral surface of the large ring portion 46 between the ribs 44, 44 of the spacers 41, 41,. Therefore, it is possible to easily attach an IC tag by a human hand without requiring a new jig or the like.

“Fourth Embodiment”
FIG. 11 is a perspective view showing a box culvert that is a concrete product according to the fourth embodiment of the present invention, and the box culvert according to the present embodiment is similar to the L-type retaining wall according to the first embodiment. The thin plate-like IC tag 3 is embedded in a position that is in the vicinity of the side surface 51a of the concrete body 51 and in the vicinity of the side surface 51a of the concrete body 51 inside and outside the cylindrical concrete body 51 having a letter-shaped shape. The tag 3 is embedded so that the antenna surface of the antenna portion is parallel to the outer side surface 51 a of the concrete body 51.
Also in the box culvert of this embodiment, the same effect as the L-type retaining wall of the first embodiment can be obtained.

It is a perspective view which shows the L-shaped retaining wall of the 1st Embodiment of this invention. It is sectional drawing of the A area | region of FIG. It is a perspective view which shows an IC tag. It is sectional drawing which follows the BB line of FIG. It is a perspective view which shows the manufacturing method of the L-shaped retaining wall of the 1st Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the L-shaped retaining wall of the 1st Embodiment of this invention. It is sectional drawing which shows the L-shaped retaining wall of the 2nd Embodiment of this invention. It is a perspective view which shows the spacer of the L-shaped retaining wall of the 2nd Embodiment of this invention. It is sectional drawing which shows the L-shaped retaining wall of the 3rd Embodiment of this invention. It is a perspective view which shows the spacer of the L-shaped retaining wall of the 3rd Embodiment of this invention. It is a perspective view which shows the box culvert of the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete body 1a Side 1b Placing surface 2 Reinforcing bar 3 Thin plate IC tag 11 Substrate 12 IC
DESCRIPTION OF SYMBOLS 13 Antenna part 14 Film 21-24 Formwork 21a Inner surface 25 Raw concrete 25a Placing surface 31 Spacer 32 Fixed part 33 Positioning part 34 Connection part 41 Spacer 42 Cut 43 Small ring part 44 Rib 45 Cut 46 Large ring part 51 Concrete body 51a One side 51b Placing surface

Claims (13)

  A concrete product comprising a thin plate-like non-contact communication medium embedded in the vicinity of one surface of a concrete body.   2. The concrete product according to claim 1, wherein the non-contact communication medium is embedded in the vicinity of the placement surface of the concrete body and in the vicinity of one surface other than the placement surface of the concrete body. .   The concrete product according to claim 1 or 2, wherein a position of one end portion of the non-contact communication medium substantially coincides with a placement surface of the concrete body.   3. The concrete product according to claim 1, wherein the non-contact communication medium is attached to a reinforcing bar positioning member provided in the concrete body.   The concrete product according to any one of claims 1 to 4, wherein a distance between the antenna portion of the non-contact communication medium and the one surface is within 3 cm.   The concrete product according to any one of claims 1 to 5, wherein the non-contact communication medium has a length of 150 mm or less and a width of 100 mm or less.   7. The non-contact communication medium is provided with an integrated circuit capable of writing / reading information and the antenna portion on a substrate made of a flexible organic polymer. The concrete product according to any one of the above.   The concrete product according to any one of claims 1 to 7, wherein the integrated circuit and the antenna section are covered with a film made of an organic polymer.   9. The concrete product according to claim 1, wherein the information recorded in the non-contact communication medium is identification information of the concrete body. A method for producing a concrete product according to claim 1, 2 or 3,
Placing ready-mixed concrete in the concrete product formwork,
Next, a non-contact communication medium in the form of a thin plate is embedded in the ready-mixed concrete from the casting surface of the ready-mixed concrete,
Next, a method for producing a concrete product, wherein the ready-mixed concrete is cured and then demolded to obtain a concrete product. A method for producing a concrete product according to claim 4,
A non-contact communication medium is attached to a positioning member provided on the reinforcing bar,
Next, the rebar with the non-contact communication medium attached is placed in the formwork of the concrete product,
Next, a method for producing a concrete product, characterized in that the ready-mixed concrete is placed in the formwork, then the ready-mixed concrete is cured, and then demolded to obtain a concrete product. A method for managing a concrete product according to any one of claims 1 to 9,
A concrete product characterized in that information recorded in a non-contact communication medium of the concrete product is read in a non-contact manner using a non-contact communication medium reader, and the concrete product is managed based on the read information. Management method.   The non-contact communication medium reading device is a portable non-contact communication medium reading / writing device that performs both reading of information from the non-contact communication medium and writing of information to the non-contact communication medium. The method for managing a concrete product according to claim 12, characterized in that:

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