JP6317985B2 - Spacer structure - Google Patents

Description

  The present invention relates to a spacer structure.

In a reinforced concrete structure, in order to prevent corrosion of a reinforcing bar (metal), it is necessary to secure a concrete covering having a predetermined thickness.
The concrete covering is generally set so that a desired distance can be secured by inserting a spacer between the formwork and the reinforcing bar when placing concrete.

  As such a spacer, for example, Patent Document 1 discloses a spacer main body made of a metal plate having a spring property integrated with a spacer body made of concrete or mortar. This spacer secures a desired concrete covering thickness from the reinforcing bar to the formwork by being fixed to the reinforcing bar by the reinforcing bar holding portion.

  Patent Document 2 discloses a spacer structure including an attachment jig attached to a reinforcing bar, an adjustment post screwed to the attachment jig, and a spacer main body attached to the tip of the adjustment post. The spacer main body and the adjustment post are fixed through a nut embedded in the base end portion of this.

JP 2006-161296 A JP 2005-344379 A

  Since the spacer described in Patent Document 1 is configured such that the spacer is fixed to the reinforcing bar, when an assembling error of the reinforcing bar occurs, a gap is generated between the spacer and the formwork.

  On the other hand, the spacer structure of Patent Document 2 allows the spacer body to abut the formwork with the adjustment strut when an assembly error of the reinforcing bar occurs, but the metal member (nut) is exposed in the concrete covering portion. (The metal member is directly embedded in the concrete covered part). If the metal is exposed in the concrete cover, the metal may corrode for some reason.

  The present invention aims to solve the above-mentioned problems, and has a spacer structure in which a metal object is not exposed in the concrete cover and a desired concrete cover thickness can be reliably ensured. The challenge is to propose.

  In order to solve the above-mentioned problem, a spacer structure according to a first aspect of the present invention includes a fixing jig fixed to a reinforcing bar and a spacer that secures a predetermined concrete covering thickness on the concrete surface side of the reinforcing bar. The spacer includes a spacer main body disposed on the concrete covering portion, a bolt receiving portion protruding from the back surface of the spacer main body, and an allowance adjusting bolt screwed to the fixing jig. The spacer main body and the bolt receiving portion are formed of a non-metallic material, one end of the allowance adjusting bolt is fixed to the bolt receiving portion, and the base end surface of the bolt receiving portion is the concrete cover. It is characterized by not entering the part.

According to such a spacer structure, since the allowance adjustment of the spacer can be adjusted by the allowance adjusting bolt, the spacer can be brought into contact with the formwork even when a rebar assembling error occurs.
Moreover, since the base end surface (end surface opposite to the concrete surface) of the bolt receiving portion does not enter the concrete covering portion, the metal is not exposed in the concrete covering portion. Therefore, the metal does not corrode in the concrete covering portion.

  The spacer structure according to the second invention comprises a fixing jig fixed to a reinforcing bar, and a spacer for securing a predetermined concrete covering thickness on the concrete surface side of the reinforcing bar, A spacer main body having the same height as the concrete covering thickness, a bolt receiving portion protruding from the back surface of the spacer main body, and an allowance adjusting bolt screwed to the fixing jig. The main body is made of a cement-based material, and one end of the allowance adjusting bolt is fixed to the bolt receiving portion.

  According to such a spacer structure, the concrete covering thickness can be secured only by positioning the spacer main body on the concrete surface side of the reinforcing bar. Therefore, the spacer main body plays a regular role and is excellent in workability. Further, since there is no hardware in the spacer body, there is no foreign matter in the concrete covering, and therefore the quality of the concrete structure can be improved.

  It is good to form the collar part which can contact | abut the outer surface of the concrete surface side of the said reinforcing bar in the base end side of the said spacer main body. If it does in this way, it will become possible to ensure predetermined concrete covering thickness only by making a collar part contact a reinforcing bar.

  The fixing jig preferably has a female screw portion screwed to the allowance adjusting bolt and a grip portion for gripping the reinforcing bar.

  Further, the gripping portion includes a locking portion that locks the reinforcing bar, and a fixing bolt that contacts the reinforcing bar from the opposite side of the locking portion, and the tip of the locking portion on the concrete surface side is If it is located between the center of the reinforcing bar and the outer surface of the reinforcing bar on the concrete surface side, the hardware is not disposed in the concrete cover.

  According to the spacer structure of the present invention, hardware can be prevented from being exposed in the concrete cover, and a predetermined concrete cover thickness can be reliably ensured, and the labor during construction can be reduced. Become.

(A) And (b) is a perspective view which shows the spacer structure which concerns on 1st embodiment. It is a side view of the spacer structure shown in FIG. It is an AA arrow line view of FIG. (A) And (b) is a perspective view which shows the fixing jig of 1st embodiment. (A) And (b) is a perspective view which shows the spacer structure which concerns on 2nd embodiment. It is a figure which shows the fixing jig of 2nd embodiment, Comprising: (a) is a top view, (b) is a BB arrow directional view of (a).

<First embodiment>
As shown in FIG. 1, the spacer structure 1 according to the first embodiment and the like includes a fixing jig 2 fixed to the reinforcing bar 4 and a spacer 3 attached to the fixing jig 2.

  The spacer 3 is a member for securing a predetermined concrete covering thickness on the concrete surface side of the reinforcing bar 4, and as shown in FIG. 2, the spacer body 31, the bolt receiving portion 32, and the allowance adjusting bolt 33 are arranged. I have.

  The spacer body 31 is a portion disposed on the concrete surface side of the reinforcing bar 4 and is formed in a columnar shape. The spacer main body 31 is made of a cement-based material and is formed so as not to include a hardware. Furthermore, the spacer main body 31 is formed so that the distance (height) from the front end to the base end is the same as the design concrete covering thickness (reference value).

At the base end portion of the spacer main body 31, a collar portion 34 having an enlarged skirt shape is formed.
The radius of the base end face of the collar portion 34 is equal to or longer than the radius of the bolt receiving portion 32 plus the radius of the reinforcing bar 4.

The shape of the spacer body 31 is not limited.
Moreover, the cement-type material which comprises the spacer main body 31 is not limited, For example, what is necessary is just to use concrete and mortar.

The bolt receiving portion 32 is made of a cement material and is integrally formed on the base end surface of the spacer body 31. The bolt receiving portion 32 is formed in a cylindrical shape in a state of protruding from the base end surface (back surface) of the spacer main body 31.
One end of an allowance adjusting bolt 33 is embedded in the bolt receiving portion 32.

The allowance adjustment bolt 33 is constituted by a so-called dimensioning bolt (full screw).
The allowance adjusting bolt 33 extends from the bolt receiving portion 32 toward the rear of the spacer body 31 (in the direction opposite to the tip of the spacer body 31) and is screwed to the fixing jig 2.

  One end of the allowance adjusting bolt 33 is fixed to the bolt receiving portion 32 in a state of being housed in the bolt receiving portion 32. In other words, the allowance adjusting bolt 33 is located behind the base end surface of the spacer body 31 and is not inserted into the spacer body 31.

  In the present embodiment, a plurality of fixing members 36, 36,... Are formed on the outer surface of one end portion (portion embedded in the bolt receiving portion 32) of the allowance adjusting bolt 33.

The fixing member 36 of the present embodiment is made of a blade-like member and protrudes from the outer surface of the allowance adjusting bolt 33.
The fixing member 36 may be formed as necessary, and is not necessarily formed. Further, the shape and arrangement of the fixing member 36 are not limited.

The fixing jig 2 is a jig for fixing the spacer 3 to the reinforcing bar 4.
As shown in FIGS. 2 and 3, the fixing jig 2 of the present embodiment includes a jig main body 20 and fixing bolts 21 attached to the jig main body 20.

As shown in FIGS. 4A and 4B, the jig body 20 includes a pair of side plates 22, 22, a lateral plate 23 laid across one end of the side plates 22, 22, and other side plates 22, 22. A vertical plate 24 laid horizontally on the rear surface on the end side forms a mouth shape in front view (see FIG. 3).
In the present embodiment, the jig body 20 is formed by pressing a single steel sheet, but the jig body 20 may be formed by joining a plurality of steel sheets.

As shown in FIG. 3, the pair of side plates 22, 22 are opposed to each other with a horizontal plate 23 interposed therebetween.
In the present embodiment, the side plates 22 and 22 and the horizontal plate 23 are formed by bending into a gate shape.

The distance between the pair of side plates 22 and 22 is larger than the outer diameter of the bolt receiving portion 32. That is, the jig body 20 has a shape that allows the bolt receiving portion 32 to be inserted between the pair of side plates 22 and 22.
In addition, the magnitude | size of the space | interval of a pair of side plates 22 and 22 should just be able to insert the bolt receiving part 32 between a pair of side plates 22 and 22 in the concrete surface side of the vertical board 24, and the full length (overall height of the side plate 22). ) Over the outer diameter of the bolt receiving portion 32.

As shown in FIG. 4, the side plate 22 is formed in a U shape when viewed from the side by forming a recess 25 that opens to the concrete surface side.
The recess 25 has a shape into which the reinforcing bar 4 can be inserted. A locking portion 26 is formed in the recess 25.

The locking portion 26 is formed at a position facing the horizontal plate 23 and is locked to the reinforcing bar 4.
A locking groove 26 a is formed in the locking part 26. As shown in FIG. 2, the locking portion 26 is locked to the reinforcing bar 4 by inserting a part of the reinforcing bar 4 into the locking groove 26 a.

  The locking groove 26a of the present embodiment is formed in a rectangular cross section, but the shape of the locking groove 26a is not limited. Further, the locking groove 26a may be formed as necessary, and the locking groove 26a is not necessarily formed.

  The distance from the center line of the locking groove 26 a to the tip of the locking portion 26 (tip on the concrete surface side of the jig body 20) is smaller than the radius of the reinforcing bar 4. Therefore, when the locking part 26 of the reinforcing bar 4 is locked, the tip of the locking part 26 is arranged at a position between the center of the reinforcing bar 4 and the outer surface of the reinforcing bar 4 on the concrete surface side.

  The portion of the recess 25 that faces the locking portion 26 (the side of the recess 25 on the side of the horizontal plate 23) is inclined so that the distance from the locking portion 26 increases toward the tip. That is, in the recess 25, the interval between the opening portions is larger than the interval between the bottom portions, and the rebar 4 can be easily inserted. In addition, the shape of the recessed part 25 is not limited. The locking portion 26 does not protrude toward the concrete surface side from the base end surface of the spacer body 31 (the collar portion 34).

As shown in FIG. 3, the horizontal plate 23 connects one end portion (lower portion in FIG. 3) of the pair of side plates 22, 22 and is disposed in parallel with the reinforcing bar 4.
Further, as shown in FIG. 2, the horizontal plate 23 is slightly inclined with respect to the axial center of the spacer 3 so as to move away from the spacer 3 toward the concrete surface side. That is, the normal line of the plate surface of the horizontal plate 23 is inclined with respect to a plane whose normal is the center line of the allowance adjusting bolt 33. The inclination angle of the horizontal plate 23 is not limited.

A bolt hole 27 for screwing the fixing bolt 21 is formed in the horizontal plate 23.
The bolt hole 27 is formed such that an extension line of the central axis of the fixing bolt 21 screwed into the bolt hole 27 intersects the central axis of the reinforcing bar 4. The intersection angle between the center of the allowance adjusting bolt 33 and the extension line of the central axis of the fixing bolt 21 is smaller than 90 °.
The shape (inner diameter) of the bolt hole 27 may be appropriately set according to the standard of the fixing bolt 21.

As shown in FIG. 2, the vertical plate 24 is horizontally mounted on the back surfaces of the pair of side plates 22, 22 (surface opposite to the concrete surface) so as to be parallel to the axis of the reinforcing bar 4.
In the present embodiment, the vertical plate 24 is formed only on the other end side (the side opposite to the horizontal plate 23) from the recess 25. In addition, the range which forms the vertical board 24 is not limited, For example, you may form over the full length (overall height) of the side board 22. FIG.

In the present embodiment, the vertical plate 24 is formed by bending a plate piece extending from one side plate 22 toward the other side plate 22, but the method of forming the vertical plate 24 is not limited.
The other side plate 22 is formed with a claw 22 b for locking the vertical plate 24, and the end of the vertical plate 24 is held by the claw 22 b of the other side plate 22.

The vertical plate 24 is formed with a female screw portion 28 for screwing the allowance adjusting bolt 33 of the spacer 3.
The shape (inner diameter) of the female screw portion 28 may be appropriately set according to the standard of the allowance adjusting bolt 33.

  The distance from the extension line of the central axis of the female screw portion 28 to the central axis of the reinforcing bar 4 is larger than the sum of the radius of the bolt receiving part 32 and the radius of the reinforcing bar 4.

  The fixing bolt 21 is inserted into the bolt hole 27 and comes into contact with the reinforcing bar 4 disposed in the recess 25 from the opposite side of the locking portion 26. That is, the fixing bolt 21 and the locking portion 26 constitute a grip portion 29 that grips the reinforcing bar 4.

When using the spacer structure 1, first, the fixing bolt 21 is tightened in a state where the reinforcing bar 4 is disposed in the recess 25, and the jig body 20 is fixed to the reinforcing bar 4.
Next, the allowance of the spacer 3 is adjusted by rotating the spacer 3 around the axis of the spacer 3 (progress allowance adjusting bolt 33).

  According to the spacer structure 1 of the present embodiment, since the allowance adjustment of the spacer 3 can be adjusted by the allowance adjusting bolt 33, even if an assembly error of the reinforcing bar 4 occurs, the spacer 3 is applied to the formwork. Can be touched. Moreover, it can also prevent that a formwork is damaged because the spacer 3 protrudes too much.

Moreover, since the height of the spacer main body 31 is the same as the design concrete covering thickness, the required concrete covering thickness can be ensured only by positioning the spacer main body 31 on the concrete surface side of the reinforcing bar 4. That is, the spacer main body 31 functions as a ruler for ensuring the concrete covering thickness.
Moreover, since it can confirm that the required concrete covering thickness is ensured by the positional relationship of a spacer main body and a reinforcing bar, an inspection and adjustment are easy.

  Further, since no metal is present in the spacer body 31, no foreign matter is present in the concrete cover, and therefore the quality of the concrete structure can be improved.

  Since the spacer main body 31 is formed with a collar portion 34 that can come into contact with the outer surface of the reinforcing bar 4 on the concrete surface side, a predetermined concrete covering thickness (design) can be obtained only by bringing the collar portion 34 into contact with the reinforcing bar 4. (Concrete covering thickness) can be secured. Therefore, it is excellent in workability.

  Since the fixing jig 2 is formed in such a manner that its end is positioned between the center of the reinforcing bar 4 and the outer surface of the reinforcing bar 4 on the concrete surface side in a state of being fixed to the reinforcing bar 4, it is fixed in the concrete cover. The jig 2 (hardware) does not enter (the entire fixing jig 2 does not protrude toward the mold frame from the reinforcing bar 4), and therefore the quality of the concrete structure can be improved.

Since the fixing jig 2 is securely fixed to the reinforcing bar through the grip portion 29, the spacer 3 is prevented from being tilted, rotated, and dropped off, and a predetermined concrete covering thickness can be reliably ensured.
Further, since the horizontal plate 23 is inclined, the head of the fixing bolt 21 screwed into the horizontal plate 23 is prevented from entering the concrete cover.

  Since the bolt receiving part 32 is housed between the pair of side plates 22, 22, the bolt receiving part 32 and the fixing jig 2 do not come into contact with each other. It never happens.

<Second Embodiment>
As shown in FIGS. 5A and 5B, the spacer structure 5 according to the second embodiment includes a fixing jig 6 fixed to the reinforcing bar 4, and a spacer 3 attached to the fixing jig 6. It has.
The details of the spacer 3 according to the second embodiment are the same as those of the spacer 3 shown in the first embodiment, and thus detailed description thereof is omitted.

  In this embodiment, the spacer 3 is installed so that the base end surface of the bearing portion 32 of the spacer 3 does not enter the concrete covering portion. That is, the spacer 3 is arranged so that the base end surface of the bearing portion 32 is inside the tip of the concrete surface side of the reinforcing bar 4.

The fixing jig 6 is a jig for fixing the spacer 3 to the reinforcing bar 4.
The fixing jig 6 is fixed to the intersection of the vertical bars 41 and the horizontal bars 42.

As shown in FIGS. 6A and 6B, the fixing jig 6 is mainly formed of a jig body 60.
The jig body 60 is made of a U-shaped steel plate. A female screw portion 61 is formed at a corner portion of the jig body 60 (the lower right corner portion in FIG. 6A). The material constituting the jig body 60 is not limited.

An extension allowance adjusting bolt 33 of the spacer 3 is screwed to the female screw portion 61.
The shape (inner diameter) of the female screw portion 61 may be appropriately set according to the standard of the allowance adjusting bolt 33.

  The female screw part 61 includes a central axis of the reinforcing bar 4 (vertical bar 41) intersecting with the reinforcing bar 4 (lateral bar 42) to which the jig main body 60 is attached, and a central axis of the allowance adjusting bolt 33 screwed into the female screw part 61. Is formed at a position smaller than the radius of the flange portion 34 of the spacer 3.

  The jig body 60 is formed with a recess 62 that opens on one side (the upper side in FIG. 6A).

  The recess 62 has a width larger than the reinforcing bar diameter of the reinforcing bar 4 and a depth larger than the reinforcing bar diameter. Although the recessed part 62 of this embodiment is formed in the rectangular shape, the shape of the recessed part 62 is not limited, For example, circular arc shape may be sufficient.

Further, claw portions 63 and 63 are formed on one side of the jig body 60. The nail | claw part 63 is affixed toward the concrete surface from the one side (upper side in (a) of FIG. 6) of the jig | tool main body 60. FIG.
The claw portion 63 is formed by bending an end portion of the jig body 60.
In addition, the formation method of the nail | claw part 63 is not limited. The shape of the claw portion 63 is not limited as long as it has a height smaller than the diameter of the reinforcing bar 4.

A gripping member 64 is formed on the rear surface of the jig body 60 (the lower surface in FIG. 6B). The jig body 60 is attached to the reinforcing bar 4 by holding the reinforcing bar 4 by the holding member 64.
The gripping member 64 grips the reinforcing bar 4 (the horizontal bar 42 in the present embodiment) that intersects the reinforcing bar 4 (the vertical bar 41 in the present embodiment) serving as a reference for the concrete covering.

  In the present embodiment, a so-called leaf spring steel clip formed by bending a leaf spring into a C shape is used as the gripping member 64. In addition, the structure of the holding member 64 is not limited.

In the present embodiment, the gripping member 64 is fixed to the jig main body 60 by the rivet 65. The gripping member 64 is fixed to the jig body 60 so that two opposing pieces protrude from the back surface of the jig body 60.
The method for fixing the gripping member 64 to the jig body 60 is not limited. For example, it may be fixed by welding or bolts.

The separation distance between the two opposing pieces is equal to or greater than the reinforcing bar diameter of the reinforcing bar 4 at the largest position, and is equal to or smaller than the reinforcing bar diameter of the reinforcing bar 4 at the smallest position.
The intermediate portion of the gripping member 64 is constricted, and the end portions of the gripping member 64 (front ends of two opposing pieces) are widened so as to be separated toward the front end.

As shown in FIG. 6B, the jig main body 60 has a central portion that swells on the surface side of the side portion along the axial direction of the reinforcing bar 4 to be attached. The gripping member 64 is fixed to this central portion.
The jig body 60 does not necessarily have to be raised at the center.

As shown in FIG. 5, the fixing jig 6 is configured to fit a gripping member 64 into a reinforcing bar (lateral bar 42 in the present embodiment) disposed on the inner side (opposite to the concrete surface) and to fix the claw portions 63 and 63. It fixes to the reinforcing bar 4 by latching to the reinforcing bar (vertical reinforcing bar 41 used as the reference | standard of concrete covering) arrange | positioned on the surface side.
At this time, the vertical stripe 41 is located between the claw portions 63 and 63 and the female screw portion 61.

  When fixing the fixing jig 6 to the reinforcing bar 4, first, the reinforcing bar 4 (horizontal bar 42) gripped by the gripping member 64 is inserted into the recess 62, so that the jig body 60 intersects the horizontal bar 42. At this time, the jig main body 60 is disposed on the surface side of the horizontal bar 42 and on the back side of the vertical bar 41.

  Next, when the jig main body 60 is rotated about the vertical bar 41 so that the jig main body 60 is parallel to the horizontal bar 42, the gripping member 64 is fitted into the horizontal bar 42, and the claw portions 63, 63 are moved vertically. Locked to the muscle 41.

  According to the spacer structure 1 of the present embodiment, the installation of the fixing jig 6 is completed simply by fitting the reinforcing bar 4 into the gripping member 64, and therefore, the workability is excellent.

  Since the jig body 20 is attached to the horizontal bar 42 and locked to the vertical bar 41, positional deviation, rotation, and drop-out are prevented. Therefore, the inclination, rotation, and falling off of the spacer 3 are prevented, and a predetermined concrete covering thickness can be ensured reliably.

Since the jig body 60 is disposed along the inner reinforcing bar 4 (the horizontal bar 42), the fixing jig 6 does not protrude toward the concrete surface side of the reinforcing bar 4.
Moreover, since the height of the claw part 53 is smaller than the reinforcing bar diameter of the vertical bar 41, the claw part 53 does not protrude from the reinforcing bar 4 to the concrete surface side.

  Since the spacer 3 is arranged so that the base end face of the bolt receiving portion 32 does not enter the concrete covering portion, the metal (protrusion allowance adjusting bolt 33) does not directly enter the concrete covering portion. That is, since the allowance adjusting bolt 33 is covered with the bolt receiving portion 32 formed of a cement-based material, the allowance adjusting bolt is not exposed in the concrete covering portion. Therefore, a high quality structure can be constructed.

  Since the operational effects of the spacer structure 6 according to the other second embodiment are the same as those of the spacer structure 1 shown in the first embodiment, detailed description thereof is omitted.

  The embodiment according to the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the above-described components can be appropriately changed without departing from the spirit of the present invention.

  In each of the above-described embodiments, the case where the concrete covering thickness is ensured by using the spacer structure has been described. However, the spacer structure may be used for slab height adjustment (top edge protrusion).

Colored spacers may be used. If the spacer is colored, it becomes easier to visually recognize the spacer.
Therefore, by installing a colored spacer at a predetermined position, it is possible to improve work efficiency by installing other spacers based on the colored spacer.

  In each of the above-described embodiments, the case where the spacer includes the collar portion has been described. However, the collar portion is not necessarily formed.

  In each of the above embodiments, the case where the spacer main body and the bearing portion are formed of a cement-based material has been described. However, the spacer main body and the bearing portion are not limited as long as they are non-metallic materials.

  In each of the above embodiments, the case where the spacer main body has the same height as the design concrete covering thickness has been described. However, the height of the spacer main body does not necessarily have to be the same as the design concrete covering thickness. The spacer only needs to have a height from the tip of the spacer body to the base end surface of the bearing portion equal to or greater than the design concrete covering thickness (more than the minimum distance between the reinforcing bar and the formwork).

  Although the case where the spacer is screwed into the female screw portion of the fixing jig has been described, the spacer may be fixed to the fixing jig via a nut.

DESCRIPTION OF SYMBOLS 1 Spacer structure 2 Fixing jig 20 Jig main body 21 Fixing bolt 25 Recessed part 26 Locking part 28 Female thread part 29 Gripping part 3 Spacer 31 Spacer main body 32 Bolt receiving part 33 Protrusion adjustment bolt 34 Collar part 4 Reinforcing bar 41 Vertical bar 42 Horizontal bar 6 Fixing jig 60 Jig body 61 Female thread

Claims (5)

A fixing jig fixed to the reinforcing bar,
A spacer for securing a predetermined concrete covering thickness on the concrete surface side of the reinforcing bar, and a spacer structure comprising:
The spacer is
A spacer body arranged in the concrete covering portion;
A bolt receiving portion protruding from the back of the spacer body;
And an allowance adjustment bolt screwed to the fixing jig,
The spacer main body and the bolt receiving part are formed of a non-metallic material,
One end of the allowance adjustment bolt is fixed to the bolt receiving part,
The spacer structure characterized by the base end surface of the said bolt receiving part not entering the said concrete covering part. A fixing jig fixed to the reinforcing bar,
A spacer for securing a predetermined concrete covering thickness on the concrete surface side of the reinforcing bar, and a spacer structure comprising:
The spacer is
A spacer body having the same height as the concrete covering thickness;
A bolt receiving portion protruding from the back of the spacer body;
And an allowance adjustment bolt screwed to the fixing jig,
The spacer body is made of a cement-based material,
One end of the said allowance adjustment bolt is being fixed to the said bolt receiving part, The spacer structure characterized by the above-mentioned.   The spacer structure according to claim 2, wherein a flange portion capable of contacting an outer surface of the reinforcing bar on the concrete surface side is formed on a base end side of the spacer main body.   The said fixing jig has the internal thread part screwed together with the said allowance adjustment bolt, and the holding part which hold | grips the said reinforcing bar, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. 2. The spacer structure according to item 1. The gripping portion includes a locking portion that locks to the reinforcing bar, and a fixing bolt that contacts the reinforcing bar from the opposite side of the locking portion,
The spacer structure according to claim 4, wherein a tip of the engaging portion on the concrete surface side is located between a center of the reinforcing bar and an outer surface of the reinforcing bar on the concrete surface side.

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