JP7079056B2 - Fixing jig and fixing method using this - Google Patents

Description

The present invention relates to a fixing jig for sandwiching and fixing an object in a pair at a position where concrete is placed, and a fixing method using the jig.

In concrete structures, reinforcing bars may corrode due to the effects of salt damage, neutralization, etc., and the load bearing capacity and long-term durability of the structure may be impaired. Therefore, in recent years, the maintenance of concrete structures has been attracting attention, and there is a demand for a technique for monitoring the corrosive environment and internal strain of concrete structures.

As one method of such monitoring, a method of arranging a sensor and an RFID tag connected to the sensor in advance in a concrete structure is known. FIG. 12 is a schematic view showing the sensor S1 and the RFID tag T1. As shown in FIG. 12, the sensor S1 is connected to the RFID tag T1 by the communication cable C1, and the information detected by the sensor S1 while these are embedded in the concrete structure is transmitted to the RFID tag T1. Read non-contact from the outside of the concrete structure. Conventionally, a method for attaching such a sensor or an RFID tag has been proposed.

For example, Patent Document 1 describes a method of adhering an RFID tag to a joint surface of a U-shaped metal fitting and fastening the RFID tag to the U-shaped metal fitting by sandwiching a reinforcing bar with a screw. Patent Document 2 describes a method in which a recess is provided in a sensor, the recess is sandwiched between metal mounting jigs, and the sensor is mounted on a reinforcing bar. Patent Document 3 describes a method of attaching an IC tag to a reinforcing bar by biting a ceramic member for adjusting a position in which a counterbore portion is formed.

Further, in Patent Document 4, a pair of plate-shaped spacers extending outward in the horizontal direction are fixed to reinforcing bars arranged in a grid pattern in order to maintain a constant distance from the inner surface of the formwork, and the spacer spacing is provided. A method of positioning the IC tag by attaching the IC tag to the outside of the plate-shaped connection portion for holding the constant constant is described.

Japanese Unexamined Patent Publication No. 2006-348538 Japanese Unexamined Patent Publication No. 2016-0231119 Japanese Unexamined Patent Publication No. 2016-141591 Japanese Unexamined Patent Publication No. 2008-138452

However, since the method of burying the RFID tag or sensor as described above is a work at the site where concrete is placed, it is desired to fix the RFID tag or sensor as quickly and easily as possible. In addition, in the above method, sensors and RFID tags are attached to multiple locations using wires and fixing bands. Therefore, it is usually necessary to accurately install the burial position and the direction of the sensor, and the installation time and know-how are required. Is required.

The present invention has been made in view of such circumstances, and provides a fixing jig capable of quickly and easily fixing an object to a desired position at a concrete placing site, and a fixing method using the same. With the goal.

(1) In order to achieve the above object, the fixing jig of the present invention is a fixing jig for sandwiching and fixing an object in a pair at a position where concrete is placed, and is formed of an inorganic compound and is an object. It is characterized by including a contact body that comes into contact with an object and a fitting that attaches the contact body to a reinforcing bar.

This makes it possible to quickly and easily fix the sensor or RFID tag as an object in a desired position at the concrete casting site. In addition, anyone can fix the object without shifting the position and orientation without any technical knowledge or experience.

(2) Further, the fixing jig of the present invention is characterized in that the contact body covers the surface of the object in contact with the contact body. As a result, the surface of the object in contact with the abutting body is covered with the fixing jig, so that the position and angle of the object are more stable and do not shift. Furthermore, corrosive factors do not invade the object more than just sealing with epoxy or the like. This is especially effective when the object is a corrosion sensor.

(3) Further, the fixing jig of the present invention is characterized in that a bottomed hole that fits into the shape of the object is formed on the surface of the contact body with which the object abuts. This makes it possible to prevent the object from shifting in the direction parallel to the contact surface.

(4) Further, the fixing jig of the present invention is characterized in that the bottomed holes are provided at a plurality of positions stepwise along a certain direction on a surface on which the object abuts. Thereby, by using any one of the plurality of bottomed holes, the object can be fixed in a stepwise desired position by using one kind of fixing jig.

(5) Further, the fixing jig of the present invention is characterized in that the contact body is formed with a through hole provided for inserting a cable from a surface in contact with an object to a surface on the opposite side. It is supposed to be. As a result, when the sensor is attached as an object, the cable can be inserted through the abutting body. As a result, the sensor can be pinched by the abutting body without the cable becoming an obstacle to fixing.

(6) Further, the fixing jig of the present invention is characterized in that the contact body is formed with a recess for arranging the wire on a surface other than the surface in contact with the object. As a result, the object can be firmly fixed by sandwiching the object with the abutting body and binding it from the outside with a wire.

(7) Further, the fixing jig of the present invention is characterized in that the attachment has a fitting portion into which the abutting body fits and a holding portion for sandwiching the reinforcing bar. As a result, the abutting body can be easily and firmly attached to the reinforcing bar.

(8) Further, the fixing jig of the present invention is characterized in that the abutting body is formed of a hardened cement body or a ceramic material having a strength equal to or higher than that of concrete. As a result, the proof stress of the structure can be maintained and the obstruction of wireless communication can be suppressed.

(9) Further, the fixing method of the present invention is a fixing method of an object using the fixing jig according to any one of (1) to (8) above, and the object is sandwiched between the abutting bodies. It is characterized by including a step and a step of fixing the attachment to the reinforcing bar. This makes it possible to quickly and easily fix an RFID tag or sensor as an object in a desired position at a concrete casting site. In addition, anyone can fix the object without shifting the position and orientation without any technical knowledge or experience.

(10) Further, the fixing method of the present invention is characterized by further including a step of covering the object with a curing material and curing the object after the sandwiching step. By covering the object with a hardening material such as concrete in advance in this way, the work at the concrete placing site becomes easy.

According to the present invention, an object can be quickly and easily fixed in a desired position at a concrete casting site.

(A) and (b) are a perspective view and a front view which show the fixing jig in 1st Embodiment, respectively. (A) and (b) are perspective views which show the usage mode of the fixing jig in 1st Embodiment respectively. It is a perspective view which shows the fixing jig which has the bottomed hole in each of (a) and (b) in the 2nd Embodiment. It is a perspective view which shows the fixing jig provided with a plurality of bottomed holes in 3rd Embodiment. It is a front view which shows the fixing jig which has a triangular plate-shaped contact body in 4th Embodiment. (A) and (b) are perspective views showing a pentagonal plate-shaped and a trapezoidal plate-shaped abutting body, respectively. (A) and (b) are a front view and a perspective view showing a fixing jig having a narrow contact surface in the fourth embodiment and a usage mode thereof, respectively. (A), (b) is a perspective view which shows the fixing jig which has a through hole in each of 5th Embodiment, and the usage mode thereof. It is a perspective view which shows the usage mode of the fixing jig tied with a wire in 6th Embodiment. (A) and (b) are perspective views which show the contact body and a fixing jig which have a groove in 8th Embodiment respectively. It is a perspective view which shows the usage mode of the fixing jig coated with the hardening material in 7th Embodiment. It is a schematic diagram which shows the sensor and the RFID tag.

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

[First Embodiment]
(Structure of fixing jig)
1 (a) and 1 (b) are a perspective view and a front view showing the fixing jig 100, respectively. As shown in FIGS. 1A and 1B, the fixing jig 100 includes an abutting body 110 and a fixture 120, and is used at a desired position on the site where concrete is placed, in pairs. The object is sandwiched and fixed. FIGS. 1 (a) and 1 (b) show the configuration of a single fixing jig 100, but when in use, two fixing jigs 100 are used to sandwich an object. 2 (a) and 2 (b) are perspective views showing how to use the fixing jig 100, respectively. FIG. 2A shows a scene in which the sensor S1 is fixed as an object, and FIG. 2B shows a scene in which the RFID tag T1 is fixed as an object. In addition, an antenna can also be used as the object.

The abutting body 110 is formed of a material having a hardness that allows the object to be sandwiched, and abuts on the object. The abutting body 110 may be formed of a resin or a metal, but is preferably formed of a cement hardened body or an inorganic compound such as ceramics from the viewpoint of fixing certainty, cost, prevention of invasion of corrosion factors, and the like. .. The hardened cement body includes concrete, mortar, cement paste and the like. In the case of a hardened cement, it can be manufactured by pouring a hardened material made of a kneaded material of cement and aggregate or a hardened material made of cement paste into a mold having a designed shape and curing it. Further, in the case of ceramics, it can be manufactured by molding a powder material into a designed shape and firing it. The contact body 110 can also be used as a spacer for keeping the fog on the casting surface constant.

In the example shown in FIGS. 1A and 1B, the contact body 110 is formed in the shape of a square plate having four rounded corners and recessed sides. As shown in FIGS. 2A and 2B, the main surface (widest surface) of the plate-like body is used as the surface 112 that abuts on the object. The contact body 110 has a concave portion on the side surface due to the recessed side of the plate shape, which makes it easy to attach a reinforcing bar. This recess can also be used for wire placement as described below. As will be described later, the shape of the abutting body 110 is not limited to the illustrated example, but it is preferable that the shape is such that the attachment device 120 can be easily fitted by utilizing the unevenness.

Further, the contact body 110 is preferably formed of a hardened cement body or a ceramic material having a strength equal to or higher than that of concrete. As a result, it is possible to suppress the obstruction of wireless communication without leading to a decrease in the yield strength of the concrete structure. The contact body 110 preferably covers the surfaces S1a and T1a in contact with the contact body 110 in the object. That is, it is preferable that the contact body 110 covers the side surface of the sensor S1 or the RFID tag T1. As a result, the corrosive factor does not invade the object from the side surface direction, rather than simply adhering and sealing the side surface of the object with epoxy or the like. Such a configuration is effective for ensuring accurate detection, particularly when the object is the sensor S1 for detecting corrosion. It is more preferable that the contact body 110 covers all of the surfaces S1a and T1a in contact with the contact body 110 in the object.

The attachment 120 has a fitting portion 123 into which the abutting body 110 fits and a holding portion 126 for sandwiching the reinforcing bar R1, and attaches the abutting body 110 to the reinforcing bar R1. As a result, the sensor S1 or the RFID tag T1 can be quickly and easily fixed to a desired position as an object at the concrete placing site. In addition, anyone can fix the object without shifting the position and orientation without any technical knowledge or experience. When used in the field, it is preferable that the fitting of the contact body 110 and the attachment 120 has already been completed.

It is preferable that the fitting 120 is formed of a metal plate having an elastic force, and the fitting portion 123 and the holding portion 126 are integrally formed. For example, it can be manufactured by cutting out a SUS plate, heating it if necessary, and processing it. The fitting portion 123 is formed in a substantially U-shape in which the opening portion is slightly smaller than the side surface length of the contact body 110. The fitting portion 123 is adapted to widen the opening and insert the two claw portions into the recesses of the abutting body 110 so as to be fitted to the side surface of the abutting body 110.

The sandwiching portion 126 is provided on each side of the fitting portion 123 so that the reinforcing bar R1 can be sandwiched while maintaining the balance. Therefore, the fitting 120 is alternately formed with openings of the fitting portion 123 and the holding portion 126. The pinching portion 126 has an opening formed in a V shape so that the reinforcing bar R1 can be easily guided to the main body portion (the portion that contacts and presses the reinforcing bar R1 during pinching), and the main body portion is slightly smaller than the diameter of the reinforcing bar R1. It is formed narrowly so that the open main body portion can sandwich the reinforcing bar R1 by elastic force.

(Fixing method using a fixing jig)
A method of fixing an object using the fixing jig 100 configured as described above will be described. First, two fixing jigs 100 in which the attachment 120 is fitted to the contact body 110 are prepared in advance, and the contact surface 112 of each contact body 110 is applied to the object and sandwiched. Then, while maintaining the sandwiched state, it is attached to the assembled reinforcing bar R1 at a desired position at the concrete placing site. At the time of attachment, the reinforcing bar R1 is sandwiched by the holding portion 126 of the attachment 120. In order to maintain the state in which the object is sandwiched between the two abutting bodies 110, for example, it can be tied with a wire from the outside of the fixing jig 100. Details when using wires will be described later. The above order is preferable from the viewpoint of convenience of work, but it is also possible to first attach the two fixing jigs 100 to the reinforcing bar R1 and then sandwich the object to fix the position.

[Second Embodiment]
In the above embodiment, the contact surface 112 of the contact body 110 is flat, but a bottomed hole may be provided. 3A and 3B are perspective views showing fixing jigs 200 and 300 having bottomed holes 215 and 315, respectively. In the example shown in FIG. 3A, a circular bottomed hole 215 matching the side surface shape of the sensor S1 is formed on the contact surface 212 of the contact body 210. The bottomed hole refers to a hole having a bottom for receiving an object, and is not necessarily limited to a hole having a bottom on the entire surface of the hole. For example, the bottomed hole includes a hole having a partially bottom such as a counterbore and a hole having a mortar-shaped receiving surface.

Further, in the example shown in FIG. 3B, a rectangular bottomed hole 315 matching the side surface shape of the RFID tag T1 is formed on the contact surface 312 of the contact body 310. As described above, it is preferable that the contact bodies 210 and 310 are formed with bottomed holes 215 and 315 that fit into the shape of the object on the surfaces 212 and 312 with which the object abuts. As a result, it is possible to prevent the object from shifting in the direction parallel to the contact surfaces 212 and 312, facilitate the work of attaching the fixing jig 300 to the reinforcing bar R1, and firmly fix the object even after the attachment.

[Third Embodiment]
In the above embodiment, the contact bodies 210 and 310 are provided with only one bottomed hole 215 and 315, but a plurality of bottomed holes may be provided. FIG. 4 is a perspective view showing a fixing jig 400 provided with a plurality of bottomed holes 415a and 415b.

In the example shown in FIG. 4, bottomed holes 415a and 415b are provided at two positions stepwise along a certain direction (diameter direction of the reinforcing bar R1) on the surface with which the object abuts. Thereby, by using any of the bottomed holes 415a and 415b, the object can be fixed at a stepwise position by using one kind of fixing jig 400. As a result, for example, the distance (fog) from the reference position such as the casting surface to the RFID tag T1 can be adjusted.

[Fourth Embodiment]
In the above embodiment, the shape of the contact body 110 is a square plate having four rounded corners and recessed sides, but other shapes may be used. FIG. 5 is a front view showing a fixing jig 500 having a triangular plate-shaped contact body 510. In the example shown in FIG. 5, the contact body 510 is formed in the shape of a triangular plate having three rounded corners and recessed sides. One of the three corners is formed to be the largest, and the fitting portion 123 of the fixture 120 is fitted into the protrusions and recesses of the other two corners. The square plate shape of the contact body 110 may be a rectangular plate shape having a long bottom surface with the reinforcing bar mounting side as the bottom surface, or a rectangular plate shape having a long side surface. Further, it may have a square plate shape or a trapezoidal plate shape as described later.

6 (a) and 6 (b) are perspective views showing a pentagonal plate-shaped and a trapezoidal plate-shaped abutting body, respectively. In the example shown in FIG. 6A, the contact body 510a is formed in the shape of a pentagonal plate. Further, a groove 511a is formed in the center of the side surface of the contact body 510a along the thickness direction, and a fitting 520a formed by bending one metal rod is fitted. The fixing jig 500a is composed of such an abutting body 510a and a fixture 520a. In this case, the reinforcing bars can be attached in an arrangement parallel to the longitudinal direction of the bottom surface 515a of the contact body 510a, and the object can be sandwiched by, for example, the fixing jigs 500a attached to the two reinforcing bars. On the other hand, in the example shown in FIG. 6B, the contact body 510b is formed in the shape of a trapezoidal plate. In this case, it is possible to attach the contact body 510b to a plurality of reinforcing bars provided in parallel by utilizing the recess 515b formed on the bottom surface corresponding to the longest side of the trapezoid.

7 (a) and 7 (b) are a front view and a perspective view showing the narrow fixing jig 600 having the contact surface 612 and its usage mode, respectively. In the examples shown in FIGS. 7 (a) and 7 (b), the contact body 610 is formed in the shape of a square plate having recesses 614 on both side surfaces at the center, and the fixture 120 is fitted to the main surface of the contact body 610. I'm wearing it. The side surface adjacent to the side surface having the recess 614 (corresponding to one side when viewed from the main surface side) is the contact surface 612, and in the usage mode shown in FIG. 7 (b), the RFID tag is used as an object. T1 is fixed. In such a usage mode, the object can be firmly fixed particularly in the axial direction of the reinforcing bar R1.

[Fifth Embodiment]
In the above example, the contact body 210 is not provided with a through hole, but may be provided with a through hole through which the cable of the object is passed. 8 (a) and 8 (b) are perspective views showing a fixing jig 700 having a through hole 717 and a mode of use thereof. As shown in FIGS. 8A and 8B, the fixing jig 700 includes a contact body 710.

The abutting body 710 is formed with a through hole 717 provided in the center of the bottomed hole 715 and the bottomed hole 715 for inserting the communication cable C1 from the surface 712 that abuts on the object to the opposite surface 713. ing. As a result, when the sensor S1 is attached as an object, the communication cable C1 can be inserted through the contact body 710. As a result, the sensor S1 can be easily sandwiched by the contact body 710 without the communication cable C1 becoming an obstacle to fixing.

The position of the through hole 717 does not have to be the center of the contact surface 712, and may be outside the side surface of the sensor S1 when the sensor S1 is brought into contact with the bottomed hole 715. For example, when the sensor S1 is a distortion sensor using an optical fiber, it is preferable in design that the through hole 717 is provided outside the side surface of the sensor S1. When an optical fiber is used, the optical fiber corresponds to the communication cable C1. Further, the cable is not necessarily limited to the communication cable, but also includes an electric wire.

[Sixth Embodiment]
In the above embodiment, the force for pinching the object by the pair of fixing jigs 100 is only the elastic force for pinching the reinforcing bar R1 by the fixture 120, but when the fixing jig 100 is used, the force for pinching the object is separately. It is preferable to give. FIG. 9 is a perspective view showing a usage mode of the fixing jig 100 tied with the wire 800.

Since the abutting body 110 is formed in the shape of a square plate having a recessed side, the recess is a recess for arranging the wire 800. That is, the recess is formed on a surface other than the surface 112 that abuts on the object. As a result, the object can be firmly fixed by sandwiching the object with the abutting body 110 and binding the object from the outside with the wire 800. The example shown in FIG. 9 is an example, and a groove for crawling the wire 800 may be provided on a surface other than the surface 112 of the contact body 110 that abuts on the object.

[7th Embodiment]
In the above embodiment, the wire is used for sandwiching the object, but the wire may be used for attachment to the reinforcing bar. 10 (a) and 10 (b) are perspective views showing a contact body having a groove and a fixing jig 900, respectively. As shown in FIG. 10A, the contact body 910 has a groove 915 on the side surface along the longitudinal direction of the side surface. Therefore, as shown in FIG. 10B, the reinforcing bar R1 can be applied to the recess of the contact body 910, the wire 800 can be laid in the groove 915, and the contact body 910 can be attached to the reinforcing bar R1 with the wire 800. In this way, the contact body 910 can be attached to the reinforcing bar R1 with the wire 800 while maintaining the state in which the object is sandwiched between the contact bodies 910.

[Eighth Embodiment]
In the above-mentioned usage mode, the object is not covered with any material when the fixing jig is used, but the object may be covered with the cured body while the object is sandwiched between the abutting bodies. FIG. 11 is a perspective view showing a usage mode of the fixing jig 100 coated with the curing material. The hardening material includes a cement hardening material such as concrete, mortar, and cement paste. Further, a thermosetting resin or the like may be used as the curing material. In this case, the object is sandwiched between the abutting bodies 110, the object is covered with the curing material in that state, and the curing material is cured to form the covering portion D1. By covering the object with concrete or the like in advance in this way, the object can be completely fixed to the fixing jig 100, and storage and transportation can be performed at once, so that it is possible to prevent incorrect selection or loss of parts. Work at the concrete casting site becomes easier. In addition, it is possible to protect the object from deterioration during storage until casting and impact during casting. The covering work is also easy because the contact body 110 is used as a formwork on the side surface.

If the object is a sensor, it may be used by covering it with a paste or mortar that does not interfere with the penetration of corrosive factors. The covering portion that does not hinder the penetration of the corrosive factor shall be a cement hardened body with the same strength as the surrounding concrete or slightly lower strength so that the penetration of the corrosive factor typified by salt content does not become slower than that of the surrounding concrete. Further, the sensor coated with the cement hardened body has a passive film formed because the conductor pattern portion becomes an alkaline environment, is stable in the atmosphere, and has sufficient strength to withstand the casting of concrete.

100, 200, 300, 400, 500, 500a, 600, 700 Fixing jig 110, 210, 310, 510, 510a, 510b, 610, 710, 910 Contact body 112, 212, 312, 612, 712 Contact surface 120, 520a Mounting tool 123 Fitting part 126 Holding part 215, 315, 415a, 415b, 715 Bottomed hole 511a Groove 515b, 614 Recessed 713 Surface opposite to the contact surface 717 Through hole 800 Wire 915 Groove C1 Communication cable D1 Covering part R1 Reinforcing bar S1 Sensor T1 RFID tag S1a, T1a Surface that abuts on the abutting body

Claims (9)

It is a fixing jig that is attached in pairs along one reinforcing bar and sandwiches and fixes the object in pairs at the position where concrete is placed.
An abutting body made of an inorganic compound that comes into contact with an object,
A mounting tool for attaching the contact body to the reinforcing bar is provided .
The abutting body is a fixing jig characterized in that a bottomed hole that fits in the shape of the object is formed on the surface on which the object abuts . A fixing jig that sandwiches and fixes an object in pairs at the position where concrete is placed.
An abutting body made of an inorganic compound that comes into contact with an object,
A mounting tool for attaching the contact body to the reinforcing bar is provided.
In the abutting body, a bottomed hole that fits the shape of the object is formed on the surface on which the object abuts.
The bottomed hole is a fixing jig characterized in that the bottomed hole is provided at a plurality of positions stepwise along a certain direction on a surface with which the object abuts. A fixing jig that sandwiches and fixes an object in pairs at the position where concrete is placed.
An abutting body made of an inorganic compound that comes into contact with an object,
A mounting tool for attaching the contact body to the reinforcing bar is provided.
The contact body is a fixing jig characterized in that a through hole provided for inserting a cable from a surface in contact with an object to a surface on the opposite side is formed. The fixing jig according to any one of claims 1 to 3, wherein the abutting body covers a surface of the object in contact with the abutting body. The fixing jig according to any one of claims 1 to 4 , wherein the abutting body is formed with a recess for arranging a wire on a surface other than the surface that abuts on the object. The fixing jig according to any one of claims 1 to 5 , wherein the attachment has a fitting portion into which the abutting body fits and a holding portion for sandwiching a reinforcing bar. The fixing jig according to any one of claims 1 to 6 , wherein the abutting body is made of a hardened cement body or a ceramic material having a strength equal to or higher than that of concrete. A method for fixing an object using the fixing jig according to any one of claims 1 to 7 .
The process of sandwiching the object with the abutting body and
A method for fixing an object, which comprises a step of fixing the attachment to a reinforcing bar. The fixing method according to claim 8 , further comprising a step of covering the object with a curing material and curing the object after the sandwiching step.

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