JP3408483B2 - Spacer for reinforcing bars - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a spacer for a reinforcing bar,
As a ground improvement work for the foundation of especially seismic isolated buildings, the concrete cover allowance between the embedded hole drilled in the ground and the concrete pile reinforcing steel cage that is cast in-situ here should be kept constant. Reinforcing bar spacer for securing.

[0002]

2. Description of the Related Art As a reinforcing bar spacer used in this type of construction site, a first product shown in FIGS. 13 to 16 and a second product shown in FIGS. 17 and 18 are known.

The first product spacer (S1) for reinforcing bars is 1
A spacer main body (1) bent from a single metal plate material into a substantially horizontal trapezoidal shape , and a pair of upper and lower mounting seats (2a) (2b) that continuously project outward from the ends of both inclined leg surfaces thereof.
Both are equipped with a mounting pile (2a) (2b) for mounting and using the concrete pile on the rebar cage (A).
Is welded to the longitudinal main bar (3) of the rebar cage (A).

The second product, the rebar spacer (S2)
Is a spacer body arm (4) half-folded from one metal wire into a horizontal V-shape and a separate metal wire welded to the middle of the body arm (4). It is provided with a V-shaped mounting arm (5) and a metal ground plate (6) which is also welded to both ends of the spacer body arm (4) which are separated from each other. The pair of upper and lower locking hooks (7a) and (7b) bent in the opposite directions of are attached to the concrete pile rebar cage (A) for use.
The reinforcing bar cage (A) is twisted and locked to the longitudinal main bar (3).

Incidentally, other reference numerals (8) in FIGS. 14 and 15 are to the longitudinal main bar (3) of the above-mentioned reinforcing bar basket (A), one independent ring form or one continuous spiral. As a form, it is a hoop muscle that is wound and integrated, and (9) shows an embedding hole for a rebar cage that is bored in the ground.

[0006]

However, the first reinforcing bar spacer (S1) of the first product can be mass-produced at low cost only by sheet metal stamping, and has the advantage of being able to cope with the change in the thickness of the vertical main bar (3). On the other hand, at the construction site, the upper and lower pairs of the above-mentioned mounting seats (2a) and (2b) must be welded to the vertical main bar (3) of the reinforcing bar cage (A) one by one, resulting in a great deal of troublesome and labor intensive work efficiency. Can not be improved.

[0007] Further, a spacer (S
It is impossible to change or adjust the mounting position of 1) afterwards, and further, the welding of the construction site will significantly reduce the strength of the longitudinal main bar (3), which is not allowed at all. , Tend to be shunned.

On the other hand, the reinforcing bar spacer (S2) of the second product can be easily and conveniently attached to and detached from the longitudinal main bar (3) of the reinforcing bar cage (A), and therefore the longitudinal main bar (3).
It can be said that there is an advantage that it is possible to deal with the change / adjustment of the mounting position with respect to.

However, both locking hooks (7a) and (7b) of the mounting arm (5) bent from one metal wire.
Is applied to the vertical main bar (3) and is locked so as to be twisted and rotated. Therefore, both locking hooks (7a) (7a) having a bending degree according to the thickness of the vertical main bar (3) ( 7
As a spacer (S2) for a reinforcing bar including b), it is necessary to prepare and prepare many kinds of the spacer, and the compatibility or versatility with respect to the change in the thickness of the longitudinal main bar (3) is poor.

The mounting arm (5) is made of one metal wire rod, and the locking hooks (7a) at both ends thereof are separated.
Since the elastic force of the wire rod locks (7b) the vertical main bar (3) so that it is twisted and rotated, the spacer (S2)
It is extremely difficult to stand the metal ground plate (6), which will be grounded to the inner wall surface of the embedding hole (9), and the vertical main bar (3) in an accurate parallel posture in the mounted state of. Therefore, the concrete cover margin (T) between the inner wall surface of the embedding hole (9) and the longitudinal main bar (3) of the reinforcing bar cage (A) becomes unstable.

In such a situation, when the attachment work to the vertical main reinforcement (3) at the construction site is roughly performed, or when the pair of upper and lower locking hooks (7a) and (7b) are thicker than the vertical main reinforcement (3). As the degree of bending depending on the degree, when the bending process is not performed with high precision, it will occur remarkably, and the concrete cover allowance (T) cannot be constantly and correctly secured.

In particular, both locking hooks (7a) and (7b) of the mounting arm (5) are connected to the longitudinal main bar (3) of the reinforcing bar basket (A),
Since it is only twisted and locked by the elastic force of the metal wire rod, when the rebar cage (A) with such a spacer (S2) attached is subsequently suspended inside the embedding hole (8), its embedding hole (9) the spacer body arm (4) to the inner wall surface of the or a ground plate (6) or if I衝 <br/> those them, or subsequently pouring the concrete into the embedding hole (8) Sometimes also spacer body arm (4)
If the grounding plate (6) or the ground plate (6) receives a compressive force of concrete from above, the spacer (S
Even if it is assumed that there is a possibility that the 2) will drop out or the position will shift, and it is assumed that there is no such possibility, it is inevitable that the spacer (S2) itself swings around the longitudinal main bar (3) as the pivot axis.
Then, as a result of the ground plate (6) of the spacer (S2) not grounding to the inner wall surface of the embedding hole (9), it does not function as a reinforcing bar spacer (S2) for keeping the concrete cover margin (T) constant. .

Further, the spacer body arm (4) and the mounting arm (5) need to be bent from separate metal wires, and the welding of both arms (4) and (5) and the spacer body arm ( Since 4) and the ground plate (6) must also be welded, the manufacturing process of the reinforcing bar spacer (S2) requires significantly more steps, and has compatibility and versatility with respect to changes in the thickness of the vertical main bar (3). In combination with not doing so, there is also a problem that mass production effects cannot be expected.

[0014]

SUMMARY OF THE INVENTION The present invention intends to radically solve these problems and presents a buried hole in the ground.
Concrete reinforced concrete basket for reinforcement of concrete piles
In order to secure a certain amount of cover, the length of the rebar cage is vertical.
As a reinforcing bar spacer attached to the main bar,

The spacer body is made of a metal plate having a constant width.
From the above to the inner wall surface of the embedded hole
A vertical bottom surface and a pair of upper and lower inclined leg surfaces.
Bend into a horizontal trapezoid with the bottom as the streak,

Either one of the spacer bodies
Lock the hook from the inclined leg surface to the above-mentioned longitudinal main bar by
Overhangs for a certain length as an extended state that intersects with
Along with

From the same one inclined leg surface,
The outwardly bent end that is almost parallel to the bottom is
As a bolt support flange,
Screw the main bar pressure bolt so that it can be moved back and forth in the vertical main bar.
While concluding,

The other tilt remaining in the spacer body
The end of the oblique leg surface is used as a locking claw to the vertical main bar,

The locking claw and the locking hook are opposite to each other.
Under the condition that it is sandwiched from the front and back direction to the vertical main bar,
By pressing and fixing the above pressure bolt to the main bar,
The upper grounding bottom surface of the spacer body is approximately parallel to the vertical main bar.
It is characterized in that it is kept attached.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will now be described with reference to the drawings.
1 to 10 are basic embodiments of the present invention.
Reinforcing bar spacer (S) and its usage state
And that, but it was drilled in the ground underlying such as seismic isolation building
Implanted in the embedding hole (9) or in the embedding hole (9)
Reinforcement basket for concrete pile reinforcement (A), Reinforcement basket
To the longitudinal main bar (3) and the hoop bar (8) that form (A)
Since it is similar to the prior art described at the beginning,
Only the same reference numerals are entered in FIGS.

The rebar spacer (S) of the present invention is shown in FIGS.
As shown in Fig. 8, a single steel plate having a constant band width (W) or
From other rigid metal plate material sideways trapezoid, especially preferred
Is a spacer body (1
2) is provided.

Moreover, on the side of the spacer body (12)
A pair of upper and lower inclined leg surfaces (13a) (13
b) is the longitudinal main bar of the above-mentioned rebar cage (A) as shown in FIGS.
With the spacer (S) attached to (3),
The vertical axis (Y-Y) of the longitudinal main bar (3) and each 90 degrees
Keeping a constant crossing angle (α) (β), also on the trapezoid
The bottom surface (13c) has a vertical axis (Y-
Y) standing up substantially parallel to the inner wall of the embedding hole (9)
The surface can be grounded. That is, the above
The pacer body (12) uses the longitudinal main bar (3) of the rebar cage (A).
It is bent into a trapezoidal shape with a bottom surface.

Bilateral tilt forming the spacer body (12)
One of the inclined leg surfaces (13a) and (13b)
The separated end of the inclined leg surface (13a) is the above-mentioned upper bottom surface for grounding.
A bolt support flange (14) substantially parallel to (13c)
And continuously bend outward from the inclined leg surface (13a).
Is bulged out, and therefore also this is the vertical axis of the longitudinal bar (3)
It is almost parallel to (Y-Y).

(15) is the bolt support flange (1
4) A bolt insertion hole formed in the substantially central portion of (4), (1
6) Fixing with female thread (17) in mating communication therewith
It is a nut and has the above-mentioned grounding upper bottom surface (13c).
Welding to the bolt support flange (14) from the direction (front side).
It is embodied.

(18) is also the grounding upper bottom surface (13c)
Of the fixing nut (16) from the direction in which the
For vertical main bar screwed into J (17) so that it can be moved forward and backward freely
A pressure bolt, the tip of which is outside the vertical main bar (3).
It will be pressed to the peripheral surface. The pressure bolt (1
The head of 8) locks a rotary operation tool (not shown) here.
If possible, it is not limited to the large hexagonal shape shown.

Further , the bolt supporting flange (14) is fixed to the bolt supporting flange (14).
The bolt instead of the means for welding the constant nut (16)
From the support flange (14) to the first variant embodiment of FIG.
Insert the mouth tube part that will be the bolt insertion hole (15) as shown in the
Cut and raise the plate face up by burring the plate
The female screw (1
It does not matter even if you engrave 7).

The spacer main body (1
2) and the bolt-supporting flan continuously bent from this
The required number of reinforcing beads along the entire length with the j (14)
High rigidity by arranging (not shown) in a row
It can be said that keeping it is also effective.

Both forming the spacer body (12) as well
Of the inclined leg surfaces (13a) and (13b), the other remaining inclination
The separated end of the leg surface (13b) is connected to the vertical main bar (3).
It is processed as a locking claw (19). Its inclined leg surface
The end of (13b) is preferably flat and has a divergent tip in bottom view.
By cutting out in a U shape, V shape or arc shape,
As a locking claw (19) that bites the outer peripheral surface of the longitudinal main bar (3)
It is shaped.

According to this, the thickness of the longitudinal main bar (3) changes.
Even if the spacer claws of the spacer body (12) are attached to the outer peripheral surface
(19) can always be fitted with good stability and
The effect that can be kept in a locked state with a firm bite that does not move
There is a fruit.

Further, (20) is the spacer body (1)
Locking hydrofluoric 2) and consisting of separate steel plate or other metal plate material
It is shaped like a substantially L-shaped or J-shaped flat / bottom view
The bolt support flange (1
To one of the inclined leg surfaces (13a) that is bent out in 4),
Welded and integrated from the inside to the surface contact
ing.

Moreover, the locking hook (20) has one
The slanted leg surface (13a) intersects the longitudinal main bar (3).
It has been extended by a certain length (L) as a relational state.
The hook-shaped tip holds and locks on the outer peripheral surface of the longitudinal main bar (3).
It is like this.

On the other hand, the locking hook (20) is provided with one inclined leg.
A relationship in which the surface (13a) is integrally extended and extended.
Above, the angle at which this crosses the longitudinal bar (3) is the inclination
The above-mentioned constant crossing angle between the leg surface (13a) and the longitudinal main bar (3)
It goes without saying that it is the same as the degree (α).

In short, the spacer for rebar of the present invention
In (S), one of the spacer bodies (12) is formed.
The inclined leg surface (13a) intersects with the vertical main bar (3).
Locking hook (2
0) hugs the outer peripheral surface of the longitudinal main bar (3) from the back side
At the same time as locking, form the spacer body (12) as well.
The other sloping leg surface (13b) to be made is the cut end.
The locking claws (19) of the section reverse the outer surface of the longitudinal main bar (3).
It is designed to bite and lock from the front side.

And, the locking which is separated in the vertical positional relationship.
Insert the hook (20) and the locking claw (19) into the longitudinal main bar (3), and
Under the condition that it is pinched from the opposite direction,
One pressure bolt erected on the holding flange (14)
By screwing (18), the tip of the
From the front side to the outer peripheral surface of the muscle (3), press down and fix.
It is.

As a result, the rebar cage as shown in FIGS.
Reinforcing bar spacer (S) for longitudinal main bar (3) of (A)
When installed, then hang it in the embedded hole (9) on the ground.
In the process of lowering, the spacer body (12)
Sliding against the inner wall surface of the embedding hole (9) and colliding, or
The pressure of the concrete that is subsequently poured into the embedding hole (9)
Even if it receives contracting force, its spacer body (12)
There is no risk of misalignment or dropout along the longitudinal main bar (3).
Well, let's move around the vertical axis (Y-Y) of the longitudinal main bar (3).
There is no risk of the pacer body (12) itself swinging. This
As a result, the longitudinal main bar (3) of the rebar cage (A) and the embedding
Concrete cover between the inner wall surface of the hole (9)
The margin (T) is constantly and stably secured with good stability.
It

Regarding this point, in FIGS.
(18) and locking hook (20) are on the upper side,
Shows the state of attachment to the vertical main bar (3) with the claw (19) on the lower side.
However, the vertical main bar (3) is turned upside down.
To use the spacer (S) of the present invention attached to
Of course, it is possible, and achieve the above effects regardless of which
can do.

In particular, as is apparent from the illustrated embodiment, the vertical
To engage and lock the outer peripheral surface of the main bar (3) from the front side
Up and down between the pressure bolt (18) and the locking claw (19)
In between, hug from the reverse side to the outer peripheral surface of the longitudinal main bar (3)
There is a locking hook (20) for locking
The hook-shaped tip of the locking hook (20) and the pressing bolt (1
The direction of 8) is very close to each other.
The pressure bolts (1
8) toward the vertical axis (Y-Y) of the longitudinal main bar (3).
It can be easily and correctly screwed and its longitudinal main bar (3)
The mounting condition of the spacer (S) against
You can keep it firmly and firmly.

The push bolt (18) can be screwed back and forth.
For example, remove the reinforcing bar spacer (S) from the longitudinal main bar (3).
Of course, it can be removed, and the vertical main of the rebar cage (A)
The spacer (S) can be attached to the streak (3) at any position.
Can be changed and adjusted at any time, and the thickness of the longitudinal main bar (3)
It will be possible to deal with changes without problems.

Further, in FIGS. 1 to 10, the locking hook (2
Another number of single metal plate to 0) and a spacer body (12)
To the spacer body (12)
It is welded and integrated to one inclined leg surface (13a)
However, as shown in the second modified embodiment of FIG.
Extension that intersects the inclined leg surface (13a) with the vertical main bar (3)
Longer than the other inclined leg surface (13b) that remains
With the overhang, the long overhanging inclined leg surface (13
Part of the face-up cut-and-raised piece of a) is a bolt support flange.
(14) For grounding the spacer body (12)
While keeping it almost parallel to the upper bottom surface (13c),
On the side facing the cut-and-raised piece of the bolt support flange (14)
The remaining portion of the slanted leg surface (13a) itself is attached to the longitudinal main bar (3).
It may also be set as a locking hook (20) that bites into.

The locking hook (20) has a bolt support flap.
Inclination (14) faces the above-mentioned tilt relative to the bending and bending process.
Almost L-shaped or J-shaped in flat / bottom view on the inclined leg surface (13a)
Will remain as. In addition, the first and second change
Other configurations in the embodiment are the same as those in the basic embodiment.
Since they are substantially the same, FIGS.
Only enter the corresponding code with 0, and the detailed explanation
Is omitted.

[0041]

INDUSTRIAL APPLICABILITY As described above, the present invention is a buried hole in the ground.
(9) Reinforcing bars for concrete pile reinforcement that are cast in-situ
Securing a concrete cover allowance (T) for the basket (A)
Therefore, attach it to the longitudinal main bar (3) of the rebar cage (A).
As a rebar spacer (S)

The spacer body (12) has a constant band width.
From the metal plate material of (W) to the inner wall surface of the embedding hole (9)
A pair of top and bottom (13c) that can act as a ground in an upright state
The inclined leg surfaces (13a) (13b) of
Bend in a horizontal trapezoid with the main bar (3) as the lower bottom,

Any of the spacer bodies (12)
From one of the inclined leg surfaces (13a) to the vertical main bar (3)
The extension that crosses the locking hook (20) with the longitudinal main bar (3).
Constant as long state length (L) by co If protrude integrally
To

Above the same inclined leg surface (13a)
Outward continuous, almost parallel to the grounding upper bottom surface (13c)
The bent end is used as the bolt support flange (14).
On the bolt support flange (14).
The tilt (18) can be freely screwed in and out of the vertical main bar (3).
While concluding,

Remaining in the spacer body (12)
The end of the other inclined leg surface (13b) to the vertical main bar (3)
As the locking claw (19) of

The locking claw (19) and the locking hook (2)
It is sandwiched in the longitudinal main bar (3) from the front and back directions that are opposite to
The vertical bolt (3) under
By fixing (18) by pressing,
-Connect the upper grounding bottom surface (13c) of the main body (12) to the longitudinal main bar
Since the mounting condition is kept almost parallel to (3),
It is a solution to the problems of the prior art presented based on 3-18.
There is an effect.

That is, according to the above configuration of the present invention, one sheet of
A space that is bent from a metal plate into a horizontal trapezoid.
Is it one of the inclined leg surfaces (13a) forming the sir body (12)?
And an extended state where it crosses the longitudinal main bar (3) of the rebar cage (A).
The locking hook (20) that protrudes integrally with the vertical main
From the back side, hug and lock the muscle (3),
The other inclined leg surface (13) that forms the pacer body (12)
b) is the above-mentioned longitudinal main bar due to the locking claw (19) at its end.
(3) It is designed so that it can be eaten and locked from the opposite side.
The locking claw (19) and the locking hook (20).
When sandwiched from the opposite front and back sides to the longitudinal main bar (3)
Then, attach one pressure bolt (18) to the longitudinal main bar (3).
Since it is designed to be fixed by pressing,
There is no risk of misalignment or dropout along (3).
The space around the vertical axis (Y-Y) of the longitudinal main bar (3).
There is no risk of the user (S) swinging.

As a result, the spacer in such an attached state is
The grounding upper bottom surface (13c) of the main body (12 ) is
It is also supported by the fact that it is kept almost parallel to the longitudinal main bars (3).
The longitudinal main bar (3) of the rebar cage (A) and the embedding hole (9)
Cover amount between the inner wall surface and the inner wall
(T) is always consistently correct and extremely stable.
You can

Further , the locking claw (19) and the locking hook (2)
0) is sandwiched from the reciprocal direction to the longitudinal main bar (3),
By screwing one pressing bolt (18), its longitudinal main bar
It is designed to be clamped and fixed to (3) at the construction site.
Since there is no need to perform welding work in
Not only does the strength of (3) not decrease, but the longitudinal main bar (3)
Anyone can easily attach to the
In addition to being able to freely change and adjust, the vertical main bar (3)
It has the effect of being able to handle changes in thickness.

Furthermore, the spacer body (12) is fixed.
Consists of a single metal plate with a band width (W)
The locking hook (20) to which it belongs is also made of one metal plate material.
For this reason, the spacer for the reinforcing rod of the metal wire mentioned at the beginning (S2)
Unlike simple sheet metal stamping
Spacer for reinforcing bars that achieves the above effects by a small number of steps
As (S), it can be mass-produced at low cost.
Excellent.

[Brief description of drawings]

FIG. 1 is a perspective view showing a basic embodiment of a reinforcing bar spacer according to the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a rear view of FIG.

FIG. 4 is a plan view of FIG.

FIG. 5 is a bottom view of FIG.

FIG. 6 is a side view of FIG.

7 is a sectional view taken along line 7-7 of FIG.

8 is a sectional view taken along line 8-8 of FIG.

FIG. 9 is a side sectional view showing a usage state of the reinforcing bar spacer according to the present invention.

10 is a sectional view taken along the line 10-10 of FIG.

FIG. 11 is a side sectional view showing a first modified embodiment of a spacer for a reinforcing bar according to the present invention.

FIG. 12 is a perspective view showing a second modified embodiment of the same.

FIG. 13 is a perspective view showing a conventional example of a reinforcing bar spacer.

FIG. 14 is a side view showing a conventional example in which the conventional example is attached to a reinforcing steel basket for reinforcing concrete piles.

FIG. 15 is a plan view of FIG.

16 is a partially enlarged side view of FIG.

FIG. 17 is a perspective view showing another conventional example of a reinforcing bar spacer.

FIG. 18 is a partially enlarged side view of the conventional example in which the conventional example is attached to a rebar cage.

[Explanation of symbols]

(3) -Vertical main bar (9) -Embedded hole (12) -Spacer body (13a) -Inclined leg surface (13b) -Inclined leg surface (13c) -Earth bottom surface (14) -Bolt support flange (16) -Fixing Nut (17), female screw (18), pressing bolt (19), locking claw (20), locking hook (A), rebar cage (L), fixed length (T), concrete cover allowance (W)・ Constant band width (Y-Y) ・ Vertical axis (α) (β) ・ Crossing angle

Claims (6)

(57) [Claims] 1. A coin that is cast in-situ into an embedded hole (9) in the ground.
Concrete of reinforcing bar cage (A) for concrete pile reinforcement
To secure a certain amount of tint (T), its rebar cage (A)
Reinforcing bar spacer attached to the vertical main bar (3)
As (S), the spacer body (12) is a metal plate having a constant band width (W).
Ground from the material to the inner wall surface of the embedded hole (9) in a standing state
An upper bottom surface (13c) that can act and a pair of upper and lower inclined leg surfaces (1
3a) and (13b), and the vertical main bar (3) is below
Folding sideways trapezoidal as the bottom surface, the locking hooks of one of the inclined leg surface of the spacer body (12) from (13a) to said longitudinal main reinforcement (3)
(20) and with to exit tension in its longitudinal main reinforcement (3) and a predetermined length as an extension state crossing (L) only integrally, upper base above ground from the same one of the inclined leg surface (13a)
A bolt support flange (14) is provided as an outwardly bent end that is substantially parallel to the surface (13c), and a vertical main bar pressing bolt (18) is provided on the bolt support flange (14). One that can be screwed in and out freely
Write engaging claw of the end of the left of the spacer body (12) the other inclined leg surface (13b) to said longitudinal main reinforcement (3) (1
As 9), the engaging claw (19) and the engaging hook (20) are opposite to each other.
The spacer main body (12) is fixed by pressing and fixing the pressing bolt (18) to the vertical main bar (3) under a state of being sandwiched from the front and back directions to the vertical main bar (3).
The grounding upper bottom surface (13c) is approximately parallel to the longitudinal main bar (3).
Spacer for rebar characterized by being kept in a mounted state . 2. A spacer body (12) is bent from a single metal plate material into a substantially horizontal isosceles trapezoid , and a bolt supporting flange (14) is outwardly directed from the end of one of the inclined leg surfaces (13a). The reinforcing bar spacer according to claim 1, wherein the spacer is continuously bent. 3. The fixing nut (16) of the vertical main bar pressing bolt (18) is welded and integrated with the bolt supporting flange (14) of the spacer body (12).
Spacer for rebar described. 4. A flat U-shaped, V-shaped or arc-shaped flat-bottom view in which the end of the other inclined leg surface (13b) of the spacer body (12) can be fitted to the longitudinal main bar (3). The spacer for a reinforcing bar according to claim 1, wherein the spacer is formed as a locking claw (19) to the longitudinal main bar (3) by cutting it out. 5. The locking hook (20) is attached to the spacer body (1).
A metal plate that is separate from 2) is shaped into a substantially L-shape or J-shape in plan / bottom view that can be attached to the longitudinal main bar (3), and the base end of the locking hook (20). The spacer for reinforcing bars according to claim 1, wherein the spacer is integrally welded to one of the inclined leg surfaces (13a) of the spacer body (12) so as to come into surface contact from the inside. 6. The spacer body (12) is extended so that one inclined leg surface (13a) of the spacer body (12) crosses the longitudinal main bar (3) and extends longer than the remaining other inclined leg surface (13b). A partial cut-and-raised piece of the inclined leg surface (13a) is used as a bolt support flange (14) for the ground contact.
While keeping it substantially parallel to the bottom surface (13c), the remaining portion of the inclined leg surface (13a) itself facing the cut-and-raised piece of the bolt support flange (14) itself is retained by the hook (20) to the longitudinal main bar (3). ), The spacer for a reinforcing bar according to claim 1.