JP2010106564A - Reinforcement with anchorage part, reinforcement element with anchorage part and anchor bolt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement with an anchorage part, a reinforcement element with an anchorage part and an anchor bolt capable of decreasing bending stress applied on a reinforcement body while reducing manufacturing cost and saving labor in work process. <P>SOLUTION: On the reinforcement body 2 close to the anchorage part 3, a recess 5 depressing inwardly from a circumferential face 2a of the reinforcement body 2 is formed. Into the recess 5, another reinforcement 8 crossing the reinforcement body 2 is brought to be entered and engaged. Accordingly, an eccentric distance (e), which is a distance between an axis L of the reinforcement body 2 and an axis L<SB>8</SB>of the another reinforcement 8 can be shortened. Therefore, an additional bending M applied to the reinforcement body 2 is reduced, so that the bending stress applied to the reinforcement body 2 can be reduced. Also, since a flat-plate portion 4 of the anchorage part 3 is bent and formed integrally with the reinforcement body 2, the cost and the labor in the work process can be reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a reinforcing bar with a fixing unit, a material for a reinforcing bar with a fixing unit, and an anchor bolt.

  Conventionally, as a mechanical fixing method for main bars in columns and beams of RC structures and SRC structures, fixed metal fittings are used for screw reinforcing bars, and friction joint types are used for deformed reinforcing bars. These are also used as shear reinforcement in the civil engineering field.

  The conventional mechanical fixing method for threaded reinforcing bars requires cast steel hardware as the fixing part, and the conventional mechanical fixing method for deformed reinforcing bars requires frictional bonding between the fixing part plate and the main body of the reinforcing bar. Therefore, cost reduction and labor saving of work processes have been demanded.

  Therefore, a reinforcing bar with a fixing unit in which a plate serving as a fixing unit is integrally formed from an end of a reinforcing bar main body has been proposed (for example, see Patent Document 1). In the reinforcing bar with fixing portion described in Patent Document 1, a plate is formed by forging the end portion of the reinforcing bar body, and the fixing portion is formed by bending the formed plate.

Conventionally, as an anchor bolt used when fixing a steel column base or the like to foundation concrete, a U-shaped anchor bolt is known (see, for example, Patent Documents 2 and 3). Such U-shaped anchor bolts are arranged and arranged so as to cross the underground beam main bar. Further, the U-shaped anchor bolt is set by being inserted through an opening of a plate-shaped metal column base (template) disposed at the lower end of the column base. When performing this insertion work, the open end is inserted into the opening of the column base metal using a dedicated jig for regulating the position of the U-shaped open end.
JP 2006-104785 A Japanese Patent Laid-Open No. 10-25743 JP-A-10-37204

  However, in the reinforcing bar with fixing portion described in Patent Document 1, a flat plate serving as a fixing portion is formed on one side in the radial direction of the reinforcing bar main body, and this flat plate is bent to the side opposite to the axis of the reinforcing bar main body. Since the fixing portion is formed, when another reinforcing bar is hooked on the fixing portion, additional bending acts on the reinforcing bar main body, which may increase the bending stress acting on the reinforcing bar main body.

  In addition, the U-shaped anchor bolts described in Patent Documents 2 and 3 have a problem that the work is complicated because the U-shaped anchor bolts are arranged so as to intersect with the underground beam main bars. Further, there is a problem that it takes time to insert the U-shaped open end into the flat plate opening disposed at the lower end of the column base.

  The present invention has been made to solve such a problem, and has a fixing portion capable of reducing bending stress acting on the main body of the reinforcing bar while reducing the cost and saving the work process. An object of the present invention is to provide a reinforcing bar, a reinforcing bar material with a fixing portion, and an anchor bolt.

  A reinforcing bar with a fixing part according to the present invention includes a reinforcing bar body and a fixing part that has a flat plate part and is bent from an end of the reinforcing bar body, and the fixing part is arranged on one side in the radial direction of the reinforcing bar body. The flat plate portion is bent to the other side in the radial direction, and a concave portion is formed on the reinforcing bar main body of the fixing portion that is recessed inward from the peripheral surface of the reinforcing bar main body and can be engaged with other reinforcing bars. It is characterized by being.

  In such a reinforcing bar with a fixing part, a concave part that is recessed inward from the peripheral surface of the reinforcing bar body is formed on the reinforcing bar main body of the fixing part, so that another reinforcing bar that crosses the reinforcing bar main body enters the concave part. Can be engaged. Thereby, the eccentric distance which is the distance of the axial center of a reinforcing bar main body and the axial center of another reinforcing bar can be made small. For this reason, it is possible to reduce the additional bending acting on the reinforcing bar main body and reduce the bending stress acting on the reinforcing bar main body. In addition, since the flat plate portion of the fixing portion is integrally bent from the reinforcing bar main body, cost reduction and labor saving can be achieved.

  Here, the flat plate portion is formed by forging a deformed reinforcing bar, and a plurality of convex portions formed by pressing the deformed reinforcing bar nodes are provided on the side portion of the flat plate portion. Preferably it is. Thereby, since the some convex part is formed in the side part of a flat plate part, extraction resistance can be improved further. Moreover, a convex part can be easily formed by forging a deformed bar and using the node of a deformed bar. In addition, by processing the fixing part at the end of the reinforcing bar by forging, the strength of the fixing part is higher than the strength of the reinforcing bar body. To do.

  In addition, it is preferable that a positioning shape capable of measuring a distance from another adjacent reinforcing bar main body is formed on the outer surface of the fixing unit. Thereby, since the space | interval with another adjacent reinforcing bar main body can be measured easily, bar arrangement management can be performed by visual confirmation and labor saving is achieved.

  Further, it is preferable that a position confirmation shape indicating the position of the axial center of the reinforcing bar main body is formed on the outer surface of the fixing portion. Thereby, since the position of the axial center of a reinforcing bar main body can be confirmed easily, bar arrangement management can be performed by visual confirmation, and labor saving is achieved.

  Further, the reinforcing bar-attached reinforcing bar material according to the present invention is a reinforcing bar material before the fixing part is processed, and a bent position confirmation shape indicating a base point for bending the fixing part is formed on the peripheral surface. It is characterized by being.

  In such a reinforcing bar-equipped reinforcing bar material, a bent position confirmation shape indicating the position of the base point for bending the fixing portion is provided on the peripheral surface, so that the position of the bending base point can be easily confirmed. Therefore, it is possible to save labor in the machining operation.

  Further, the anchor bolt according to the present invention is an anchor bolt fixed to the foundation concrete, and is formed by bending from a reinforcing bar main body having a threaded portion at one end and a flat plate portion from the other end of the reinforcing bar main body. A fixing portion, and the fixing portion has a flat plate portion arranged on one side in the radial direction of the reinforcing bar body bent to the other side in the radial direction. A recess that is recessed inward from the surface and engageable with another reinforcing bar that intersects with the reinforcing bar main body is formed.

  Such an anchor bolt has a concave portion that is recessed inward from the peripheral surface of the reinforcing bar main body when the reinforcing bar main body of the fixing portion is formed, so that another reinforcing bar that crosses the reinforcing bar main body is allowed to enter the concave portion. Can be engaged. Thereby, the eccentric distance which is the distance of the axial center of a reinforcing bar main body and the axial center of another reinforcing bar can be made small. For this reason, it is possible to reduce the additional bending acting on the reinforcing bar main body and reduce the bending stress acting on the reinforcing bar main body. In addition, since the flat plate portion of the fixing portion is integrally bent from the reinforcing bar main body, cost reduction and labor saving can be achieved.

  Further, when such anchor bolts are employed in a steel column base fixing structure, a pair of anchor bolts are arranged to face each other so that the fixing portion can be engaged with the underground beam main bar. As a result, it is not necessary to arrange the U-shaped anchor bolt and the underground beam main bar so as to cross each other as before, so that the bar arrangement is simplified and labor saving is achieved. In addition, since the anchor bolt can be easily inserted through the opening of the column base metal, further labor saving can be achieved.

  According to the reinforcing bar with a fixing portion of the present invention, it is possible to reduce the bending stress acting on the reinforcing bar main body while reducing the cost and labor saving of the work process.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same or corresponding elements are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a front view showing a reinforcing bar with a fixing unit according to an embodiment of the present invention, FIG. 2 is a schematic diagram for explaining a processing procedure of the fixing unit, and FIG. 3 is a main reinforcing bar orthogonal to the reinforcing bar with a fixing unit. It is a figure which shows the fixing | fixed part of the state hooked. 1 to 3 is used as a shear reinforcing bar arranged so as to intersect with the main reinforcing bar in an RC structure, for example, and a reinforcing bar main body 2 made of a deformed reinforcing bar, And a fixing portion 3 formed by bending from both ends of the reinforcing bar main body.

  The rebar main body 2 is formed in a straight line by using, for example, a steel bar for reinforced concrete. A pair of ribs 7 that are convex portions extending in the axial direction and a plurality of nodes 6 that are convex portions extending in the circumferential direction are formed on the peripheral surface 2 a of the reinforcing bar main body 2. The pair of ribs 7 are disposed so as to face each other, and the plurality of nodes 6 are disposed at regular intervals in the axial direction.

  The fixing unit 3 includes a fixing plate 4 formed into a flat plate shape by forging, for example. In addition, the fixing portion 3 is formed with a fixing recess 5 that can be engaged with another reinforcing bar 8 (see FIG. 3) arranged so as to intersect the reinforcing bar body 2.

  The fixing plate 4 is formed so that the thickness direction thereof is the axial direction of the reinforcing bar main body 2. That is, the fixing plate 4 is bent so as to be orthogonal to the axis of the reinforcing bar main body 2, and the main surface 4 a of the fixing plate 4 is oriented in the axial direction of the reinforcing bar main body 2. The fixing recess 5 is formed at the base end portion (rebar main body 2 side) of the fixing plate 4 and is formed so as to be recessed from the peripheral surface 2a of the rebar main body 2 to the axial line side.

  Next, with reference to FIG. 2, the process sequence of the fixing | fixed part 3 integrally formed in the edge part of the reinforcing bar main body 2 is demonstrated. In FIG. 2, the direction along the axis L of the reinforcing bar body 2 is the X-axis direction, the illustrated vertical direction orthogonal to the X-axis direction is the Y-axis direction, and the X-axis direction and the direction orthogonal to the Y-axis direction are the Z-axis direction. To do. 2A is a diagram showing the fixing plate before being bent and formed from the Z-axis direction, and FIG. 2B is a diagram showing the fixing plate before being bent and formed from the Y-axis direction. FIG. 4C is a diagram illustrating the fixing plate after being bent and formed from the Z-axis direction.

  As shown in FIGS. 2A and 2B, a flat plate portion to be the fixing plate 4 is formed at the end of the reinforcing bar main body 2. At this time, the fixing plate 4 is processed so as to be arranged on one side of the reinforcing bar main body 2 in the radial direction D (Y-axis direction). Further, when processing, the deformed reinforcing bar ribs 7 are directed in the Y-axis direction and pressed from the Y-axis direction, whereby the deformed reinforcing bar nodes 6 are crushed, and a plurality of convex portions 6a are formed on the side of the fixing plate 4. Is formed. In addition, you may form the some convex part 6a in the side part of the fixing plate 4 by forging a screw rebar.

  Next, as shown in FIG. 2C, a flat plate portion that becomes the fixing plate 4 arranged on one side in the radial direction D of the reinforcing bar body 2 is bent to the other side in the radial direction D, and the fixing plate 4 is formed. The main surface 4 a is directed in the direction of the axis L of the reinforcing bar body 2. Then, for example, by fixing by heating and bending using high frequency or gas pressure welding, the fixing is recessed inward from the peripheral surface 2a of the reinforcing bar body 2 on the proximal end side of the fixing plate 4 (on the reinforcing bar body 2 of the fixing unit 3). A recess 5 is formed. It is preferable that the curvature of the fixing recess 5 corresponds to the curvature of the peripheral surface of another reinforcing bar to be engaged.

  In addition, as a method (processing method) for manufacturing a reinforcing bar with a fixing portion, after forming a flat plate portion, the fixing portion 3 may be bent by pressing using a die, and the die is used. You may perform a bending process simultaneously with shaping | molding of a flat plate part only by a press. In any method, the connecting portion between the end portion of the reinforcing bar main body 2 and the flat plate portion is arranged on one side in the radial direction of the reinforcing bar main body 2, and the flat plate portion is bent on the other side in the radial direction. .

As shown in FIG. 3, the reinforcing bar 1 with the fixing unit configured as described above is used as a shear reinforcing bar arranged to be orthogonal to the main reinforcing bar 8 (another reinforcing bar), for example. At this time, the fixing part 3 of the reinforcing bar 1 with the fixing part is hooked by the main bar 8 and a part of the main bar 8 enters the fixing concave part 5. In other words, a state where the axis L ₈ of the axis L and main reinforcement 8 rebar body 2 approaches, it is possible to reduce the eccentricity e is the distance between the mutual axis L, L _8.

In the state shown in FIG. 3, the additional bending M acting on the reinforcing bar main body 2 is expressed by M = e × P ₈ (1). P ₈ is a force in the direction of the axis L acting on the axis of the main muscle 8. Thus, by making the eccentric distance e small, the additional bending M is reduced, and the bending stress acting on the reinforcing bar body 2 is reduced. Further, by directly hooking the fixing portion 3 of the reinforcing bar 1 with the fixing unit to the main reinforcing bar 8, the reinforcing bar 1 with the fixing unit used as a shear reinforcing bar can be more firmly fixed.

  Next, with reference to FIG. 4, the application to the beam main reinforcement of the reinforcing bar 1 with a fixing | fixed part is demonstrated. FIG. 4 is a schematic diagram illustrating an example of bar arrangement at a connection portion between columns and beams. In FIG. 4, the pillar 9 and the beams 10 and 11 are orthogonal to each other. Here, the reinforcing bar 1 with the fixing portion is used as a main bar of the beam 10. And the fixing | fixed part 3 of the reinforcing bar 1 with a fixing | fixed part is hooked by the main reinforcement 13 of the beam 11 orthogonal to the beam 10, and is arranged. A reinforcing bar with a fixing portion may be applied to the shear reinforcing bar 14 of the column 9. In this case, the fixing portion is hooked on the main bar 12 of the column 9 and the bars are arranged. Further, a reinforcing bar with a fixing portion may be applied to the shear reinforcing bar 15 of the beams 10 and 11. In this case, the fixing portion is hooked on the main bars of the beams 10 and 11 and arranged.

  Next, with reference to FIG. 5 and FIG. 6, a position confirmation shape for saving the bar arrangement management will be described. FIG. 5 is a diagram illustrating an example of the main bar arrangement. In this case, the reinforcing bar with fixing portion 1 of the present invention is used as a main reinforcing bar, and a plurality of main reinforcing bars are arranged. A plurality of reinforcing bars 16 intersecting with the plurality of reinforcing bars 1 with fixing portions are arranged between adjacent reinforcing bars 1 with fixing portions.

  A minimum gap confirmation step (positioning shape) 18 is formed on the outer surface of the fixing portion 3 of the reinforcing bar 1 with the fixing portion. When the end portion of the fixing plate 4 of the adjacent reinforcing bar 1 with the fixing portion is aligned with the step 18 for checking the minimum interval, the reinforcing bar main bodies 2 have the minimum reinforcing bar interval d (for example, 2.7 times the diameter D of the reinforcing bar main body). ), The position of the minimum gap confirmation step 18 is set. Thereby, since the space | interval of the adjacent reinforcing bar main bodies 2 can be measured easily, bar arrangement management can be performed by visual confirmation and labor saving can be achieved. The minimum distance confirmation positioning shape may be a concave portion, a convex portion, or the like, and may be any other shape as long as it can be confirmed by visual observation.

  Further, a bending base point mark 17 is formed at the end of the reinforcing bar body 2. The folding base point mark 17 is formed at a position to be a base point when the fixing unit 3 is bent. The bending base mark 17 is formed in advance on the peripheral surface of the reinforcing bar material before the fixing unit 3 is processed. Thereby, since the position of the bending base point can be easily confirmed, it is possible to save labor in the machining operation. In addition, the bending origin mark 17 may be a concave portion or a convex portion as long as it can be visually confirmed.

  FIG. 6 is a view showing a fixing portion in which a reinforcing bar center confirmation mark is formed. As shown in FIG. 6, it is preferable to form a reinforcing bar center confirmation mark 19 indicating the center (axial center) of the reinforcing bar body 2 when viewed from the axis L direction of the reinforcing bar body 2 on the outer surface of the fixing unit 3. Thereby, since the position of the axial center of the reinforcing bar main body 2 can be easily confirmed, the bar arrangement management can be performed by visual confirmation, and labor saving of the bar arrangement work can be achieved. The reinforcing bar center confirmation mark 19 may be a concave portion or a convex portion as long as it can be visually confirmed.

  As described above, according to the reinforcing bar 1 with the fixing unit of the present embodiment, the fixing concave part 5 that is recessed inward from the peripheral surface 2a of the reinforcing bar main body 2 is formed on the reinforcing bar main body 2 of the fixing unit 3. Another rebar 8 that intersects the rebar main body 2 can enter and engage with the recess 5. Thereby, the eccentric distance e can be made small and the additional bending which acts on the reinforcing bar main body 2 can be reduced. As a result, the bending stress acting on the reinforcing bar body 2 can be reduced. Further, since the fixing plate 4 of the fixing unit 3 is integrally bent from the end of the reinforcing bar main body 2, it is possible to eliminate the need for fixing hardware and friction bonding as in the past, and to reduce the cost and Labor saving work can be achieved.

  Further, by forming the fixing plate 4 by forging, the strength of the fixing portion 3 can be improved more than the strength of the reinforcing bar main body 2, so that the breakage at the reinforcing bar main body 2 is guaranteed and the breaking at the fixing portion 3 is prevented. can do.

  Further, by providing the plurality of convex portions 6a on the side portion of the fixing plate 4, in addition to the bearing resistance Ps due to the main surface 4a of the fixing plate 4, it is possible to consider the adhesion resistance Pb due to the plurality of convex portions 6a. As a result, the pulling resistance of the reinforcing bar 1 with the fixing portion can be increased.

  Next, a reinforcing bar with a fixing unit according to a modification of the present invention will be described with reference to FIG. 7 is different from the reinforcing bar with fixing unit 1 shown in FIG. 1 in that the shape of the fixing unit 23 is different. Specifically, a flat plate portion that becomes the fixing plate 24 is formed on one side in the radial direction of the reinforcing bar main body 2, and further bent outwardly and then bent on the other side in the radial direction. Accordingly, the fixing recess 25 formed at the base end portion of the fixing plate 24 can be formed deeply, the eccentric distance can be further reduced, and the bending stress acting on the reinforcing bar body 2 can be reduced.

  Next, with reference to FIG. 8, the application of the reinforcing bar with fixing portion of the present invention to an anchor bolt will be described. FIG. 8 is a schematic cross-sectional view showing a fixing structure of a steel column base using anchor bolts according to an embodiment of the present invention. The anchor bolt 31 shown in FIG. 8 is different from the reinforcing bar 1 with the fixing portion shown in FIG. 1 in that an external thread portion 32 is formed at an end portion where the fixing portion 3 is not formed and a nut 33 can be screwed. It is a point that is configured.

  The anchor bolt 31 is hooked by the underground beam main reinforcement 37 in the foundation concrete part 38, and is extended and arrange | positioned. The fixing portion 3 of the anchor bolt 31 is in a state in which the underground beam main bar 37 is hooked in the fixing recess 5. The upper end portion where the external thread portion 32 is formed is exposed to the ground, and the other portion is fixed in a state of being embedded in the foundation concrete portion 38.

  The column base metal 35 disposed at the lower end of the steel column base 34 is a rectangular flat plate, and openings 36 are formed at four corners thereof. The anchor bolts 31 are respectively inserted into the opening portions 36 of the column base metal 35, and the nuts 33 are screwed into the male screw portions 32. The column base 35 is fixed by the anchor bolt 31 and the nut 33, and the steel column base 34 is securely fixed to the foundation concrete portion 38 via the column base 35.

  Such an anchor bolt 31 has the same operations and effects as the above-described reinforcing bar 1 with a fixing portion. Further, unlike the conventional case, it is not necessary to arrange the U-shaped anchor bolt and the underground beam main bar in a crossing manner, so that the bar arrangement can be simplified and labor saving can be achieved. Moreover, since the anchor bolt 31 can be easily inserted through the opening 36 of the column base 35, the labor can be further saved, and the construction period can be shortened.

  FIG. 9 is a cross-sectional view showing an RC structure using the anchor bolt according to the embodiment of the present invention. As shown in FIG. 9, in the RC structure, the anchor bolt 31 that is a reinforcing bar with a fixing portion of the present invention is applied to the connecting portion between the foundation beam 40 and the column 41 and the connecting portion between the foundation beam 40 and the middle column 42. Also good.

  As mentioned above, although this invention was concretely demonstrated based on the embodiment, this invention is not limited to the said embodiment. In the above-described embodiment, the reinforcing bar 1 with the fixing unit is formed using the deformed reinforcing bar. However, the reinforcing bar 1 with the fixing unit may be formed using other reinforcing bars. Good.

  In the above embodiment, the plurality of convex portions 6 a are provided on the side portion of the fixing plate 4, but the plurality of convex portions 6 a may not be provided. Further, a reinforcing bar with a fixing portion in which the bending base mark 17, the step 18 for checking the minimum interval, and the reinforcing bar center checking mark 19 are not formed may be used.

It is a front view which shows the reinforcing bar with a fixing part which concerns on embodiment of this invention. It is the schematic for demonstrating the process sequence of a fixing part. It is a figure which shows the fixing | fixed part of the state hooked on the orthogonal main streak. It is the schematic which shows an example of the bar arrangement in the connection part of a column and a beam. It is a figure which shows an example of the main bar arrangement. It is a figure which shows the fixing | fixed part in which the reinforcing bar center confirmation mark was formed. It is a front view which shows the reinforcing bar with a fixing | fixed part which concerns on the modification of this invention. It is a schematic sectional drawing which shows the fixation structure of the steel column base using the anchor bolt which concerns on embodiment of this invention. It is sectional drawing which shows RC structure using the anchor bolt which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,21 ... Rebar with fixing part 2 ... Rebar main body 3,23 ... Fixing part 4,24 ... Fixing plate (flat plate part)
4a ... Main surface of fixing plate 5,25 ... Fixing recess 6 ... Node 6a ... Several projections 7 ... Rib 8 ... Main bars (other reinforcing bars)
DESCRIPTION OF SYMBOLS 9 ... Column 10, 11 ... Beam 12, 13 ... Main reinforcement 14, 15 ... Shear reinforcement 16 ... Reinforcement 17 ... Bending base mark (shape for confirming bending position)
18 ... Step for minimum interval confirmation (positioning shape)
19 ... Reinforcement center confirmation mark (position confirmation shape)
31 ... Anchor bolt (rebar with anchorage)
32 ... Male thread portion 33 ... Nut 34 ... Steel column base 35 ... Column base hardware 36 ... Opening portion 37 ... Underground beam main bar 38 ... Concrete concrete portion 40 ... Base beam 41 ... Column 42 ... Medium column d ... Reinforcement bar minimum interval e ... Eccentric distance D ... Radial direction P ₈ ... Force L, L ₈ ... Axis

Claims (6)

Rebar main body,
A fixing portion that has a flat plate portion and is bent from an end portion of the reinforcing bar main body,
In the fixing portion, the flat plate portion arranged on one side in the radial direction of the reinforcing bar body is bent on the other side in the radial direction,
A reinforcing bar with a fixing part, wherein a concave part that is recessed inward from the peripheral surface of the reinforcing bar main body and engages with another reinforcing bar intersecting with the reinforcing bar main body is formed on the reinforcing bar main body of the fixing part. The flat plate portion is formed by forging a deformed reinforcing bar,
The reinforcing bar with fixing portion according to claim 1, wherein a plurality of convex portions formed by pressing nodes of the deformed reinforcing bar are provided on a side portion of the flat plate portion.   The reinforcing bar with a fixing unit according to claim 1, wherein a positioning shape capable of measuring a distance from another adjacent reinforcing bar main body is formed on an outer surface of the fixing unit.   The reinforcing bar with a fixing unit according to any one of claims 1 to 3, wherein a position confirmation shape indicating a position of an axis of a reinforcing bar main body is formed on an outer surface of the fixing unit. Reinforcing bar material before processing the fixing portion according to any one of claims 1 to 4,
A material for reinforcing bars with a fixing portion, characterized in that a bending position confirmation shape indicating a base point for bending the fixing portion is formed on a peripheral surface. In anchor bolts fixed to foundation concrete,
A rebar main body with a threaded part at one end;
A fixing portion that has a flat plate portion and is bent from the other end of the reinforcing bar main body, and
In the fixing portion, the flat plate portion arranged on one side in the radial direction of the reinforcing bar body is bent on the other side in the radial direction,
An anchor bolt, wherein a concave portion that is recessed inward from a peripheral surface of the reinforcing bar main body and engages with another reinforcing bar intersecting with the reinforcing bar main body is formed on the reinforcing bar main body of the fixing portion.

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