JP3236839B2 - Rebar spacer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a reinforcing bar spacer, and more particularly, to a method for efficiently forming upper and lower reinforcing bars for reinforcing various concrete structures into a forming frame for the structures. Moreover, it is devised so that the reinforcing bars can be arranged in a stable supporting state.

[0002]

2. Description of the Related Art For example, when manufacturing slabs of buildings, bridge girders of elevated roads, and other various concrete structures,
It is necessary to stably support the reinforcing steel for the concrete structure to the weir plate of the formwork for forming the structure, and to keep the cover thickness of the cast concrete against the reinforcing steel constant and correct.

[0003] As a reinforcing bar spacer for that purpose, Japanese Utility Model Publication No. Hei 7-32711 has been proposed, and this is considered to be the known technique most similar to the present invention.

[0004]

However, in the configuration of the invention of Japanese Utility Model Publication No. 7-32711, the support leg (2) of the reinforcing bar (T) is formed by bending a single metal wire into a simple bridge shape. At the lower ends of the cut ends, which only form a straight form, are embedded in the concrete or mortar block body (3) from above, so that the lower ends of the cut ends are fixed to the block body (3). Poor strength, rough handling, or severe vibration of the vibrator during compaction of the poured concrete may cause relative unevenness or pull-out.

A pair of block bodies (3) in which the lower ends of the bearing legs (2) made of a metal wire are completely covered are all considered to be flower pots in order to stably raise the bearing legs (2). It is shaped into an inverted truncated cone,
Because it has a flat bottom surface with a large area, the bottom surface is largely exposed from the surface of the concrete structure, giving a sense of incongruity in the appearance and cosmetics, and being considered as impurities of the concrete structure. Nor can it be used universally in the manufacture of any concrete structure.

[0006] This is the same problem even when the provisional block (3) is formed from concrete or mortar into a polygonal pillar such as a square pillar or a hexagonal pillar.

On the other hand, in the case of the invention of Japanese Utility Model Publication No. Hei 7-32711, the sideways (2)
Since only one rebar (T) can be placed at the center of a), if the one rebar (T) is now the upper rebar, the lower rebar cannot be placed. .

[0008] In order to support the lower muscle, a specially designed lower spacer for the lower muscle must be specially prepared and used, and a combination of the two spacers must be used. In addition to being extremely troublesome, the inventory number will increase unnecessarily.

[0009] Even if the lower muscle is placed on the upper surface of both block bodies (3), it is inevitable that the lower muscle rolls down. It is impossible at all.

[0010] In this regard, as a reinforcing bar spacer capable of performing double bar arrangement of an upper bar and a lower bar, Japanese Utility Model Laid-Open No. 27215/1981 has been proposed.
No. 5,985,867, and the lower end of both ends of the metal wire (1) is embedded and integrated in a mortar block (3).

However, in the structure of the device disclosed in Japanese Utility Model Application Laid-Open No. 56-27215, the middle portion of one metal wire (1) is formed as a concave curved portion (2) for supporting the upper muscle, and the lower portion at both ends is similarly cut off (3). The multi-step complicated bending process must be performed as the spirally bent portion (8) embedded in), so that the mass production effect can be maximized as this kind of spacer for a large amount of reinforcing bars. In addition, it is difficult to use a thick round steel bar or the like that can withstand the compressive load of cast concrete as the metal wire (1).

For the same purpose as in the invention of Japanese Utility Model Publication No. Hei 7-32711, the block body (3) is formed into a flat rectangular parallelepiped on its lower surface. Moreover, from the lower surface of the large area in the block body (3), the metal wire (1)
The spiral bend (8) is also exposed. for that reason,
Not only does the concrete structure give a sense of discomfort in appearance, but also the surface of the concrete structure becomes unsightly stained due to rusting of the spiral bent portion (8) over time.

Further, in the case of the device disclosed in Japanese Utility Model Publication No. 56-27215, the flat upper surface of the block (3) is used as the lower muscle mounting surface (4), and the lower muscle (10) can be mounted thereon. However, the parallel legs (7) of the metal wire (1) for pinching the lower muscle (10) so as not to roll down, the upper end of the metal wire (1) is in a transversely closed state as an upper muscle supporting concave curved part (2). In order to place the lower muscle (10) on the upper surface of the block (3), it is necessary to pass the lower muscle (10) side by side into the space between the opposing parallel legs (7). It is very cumbersome, and the arrangement work cannot be performed easily and efficiently.

[0014]

SUMMARY OF THE INVENTION The present invention intends to completely improve such problems, and for this purpose, a single metal wire is bent into a generally inverted U-shape viewed from the front as viewed from the front. In the reinforcing bar spacer, the separated both ends of the formed reinforcing bar support stand are embedded and integrated in the grounding block made of a pair of right and left concrete, respectively.

By shaping each of the grounding blocks into a substantially inverted kamaboko shape having a fixed length extending along the front-rear direction of the reinforcing bar support stand, the arc-shaped lower surface is formed on the dam plate of the concrete structure forming formwork. With a ground plane that can be substantially in line contact, and with a substantially flat upper surface each set as a reinforcing bar receiving surface,

Separation of the reinforcing bar support stand so that both ends of the reinforcing bar supporting stand are exposed as a pair of left and right reinforcing bar receiving claws by a certain height above the reinforcing bar receiving surface of each grounding block. Both ends are continuously bent forward or backward.

[0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a first embodiment of a reinforcing bar spacer according to the present invention; FIG. In order to stably ground the reinforcing bar support stand (A) which is formed into a generally inverted U-shape viewed from the front and a formwork (M) for molding a concrete structure, the stand is molded from concrete. A pair of left and right grounding blocks (B1)
(B2), and the reinforcing bar support stand (A) is particularly in a relational state in which both ends of the rebar support stand are exposed upward.
Each of the ground blocks (B1) and (B2) is partially embedded and integrated.

First, the ground blocks (B1) and (B2)
As for the right and left pair, the right and left pairs are almost the same size, and a certain height (H1) (for example, about 35 mm), a width (W) (for example, about 28 mm) and a length (L) (for example, about 30 mm) are made from concrete. It is molded and hardened into an almost inverted kamaboko mold having the following. (11) and (11) show the substantially flat front surface of the grounding blocks (B1) and (B2) exhibiting an inverted conical or semicircular shape, and (12) and (12) show the substantially flat rear surface.

Then, each ground block (B1) (B2)
The substantially flat upper surface of a rectangular or square shape in plan view is used as a reinforcing bar receiving surface (13), (13), and a reinforcing bar (lower bar) (1) for reinforcing a concrete structure is provided here.
4) can be placed,
Similarly, the arc-shaped lower surfaces of the grounding blocks (B1) and (B2) are defined as grounding surfaces (15) and (15) so as to be substantially in line contact with the weir plate (16) of the concrete structure forming form (M). Have been.

That is, the ground blocks (B1) (B
As shown in FIGS. 7 to 9, the constant height (H1) of 2) fulfills the spacer function of providing the required cover thickness (T1) of the lower muscle (14). Therefore, when the cover thickness (T1) of the cast concrete with respect to the lower reinforcement (14) changes depending on the concrete structure and its arrangement, the height of the grounding blocks (B1) and (B2) is correspondingly changed. (H1) can also be changed.

The reason why the right and left pair of the grounding blocks (B1) and (B2) are formed from concrete is to maintain high affinity with cast concrete so as not to be regarded as impurities of the concrete structure. It is. Also, the reason why the grounding surfaces (15) and (15) of the grounding blocks (B1) and (B2) are formed as circular arc surfaces is as follows.
This is to prevent the concrete structure from being largely exposed from the surface of the concrete structure and not to give an uncomfortable appearance.

In any case, the grounding blocks (B1) and (B2), which are formed in an almost inverted kamaboko shape from concrete.
Is a constant length along the front-rear direction of the reinforcing bar support stand (A) in relation to the reinforcing bar support stand (A) which is bent and formed in a generally U-shape as viewed from the front from the metal wire. (L) is arranged as a direction extending only
Together with the left and right pair which are arranged side by side at a constant interval (D), the rebar support stand (A) does not fall down in the front-rear direction, and the weir plate (1) of the concrete structure forming form (M) is prevented.
6) It can be made to stand in a stable ground contact state.

In this regard, a pair of left and right grounding blocks (B1)
(B2) is fixed length (L) along the left-right direction of the reinforcing bar support stand (A) in relation to the reinforcing bar support stand (A).
If they are arranged so as to extend only in direction, both of the grounding blocks (B1) and (B2) are substantially inverted and inverted, so that the reinforcing bar support stand (A) falls down in the front-rear direction. In that sense, the present invention sets the above-described arrangement directionality.

Next, as described above, the reinforcing bar support stand (A) has a pair of right and left grounding blocks (B) which are bent and formed from a single metal wire and have a substantially inverted U-shape as viewed from the front.
1) A pair of left and right pillars (17) and (17) that stand substantially parallel to each other while maintaining the above-mentioned fixed interval (D) (for example, about 60 mm) corresponding to (B2), and a top bar that is horizontally mounted on the upper end thereof. (18).

The metal wire to be the reinforcing bar support stand (A) is preferably about 5 mm in order to resist the compressive load of the cast concrete and to cope with the change in the thickness of the reinforcing bar.
A round bar steel material having a thickness of mm is adopted, and another reinforcing bar for reinforcing a concrete structure is provided on one concave surface (19) for receiving a reinforcing bar which is depressed in an intermediate portion of the top bar (18). (Upper muscle) (20) can be stably mounted. In particular, the top bar (18) of the reinforcing bar support stand (A) is used to support the upper bar (20).

The upper bar (20) received by the rebar receiving concave curved surface (19) forms a reinforcing bar support stand (A).
It goes without saying that it extends along the front-back direction.

On the other hand, as shown in FIG. 4, the pair of right and left pillars (17) and (17) are all at a predetermined angle (α) (α) (front or rear) from the lower end thereof substantially perpendicular to the top bar (18). (For example, about 25 degrees), so that the entire reinforcing bar support stand (A) is substantially J-shaped in a side view.

The lower ends of the two pillars (17) (17) in such a reinforcing bar support stand (A) are paired with the pair of left and right grounding blocks (B1) (B).
2) By being buried and integrated into the implanted state, the spacer is finished as the reinforcing bar spacer of the present invention. The lower ends of the pillars (17) and (17) and the grounding blocks (B1) and (B2) Is set as follows.

That is, both ends of the metal wire rod which is continuously bent and raised by a predetermined angle (α) forward or backward from the lower ends of the pillars (17) and (17) are shown in FIGS.
As is apparent from the above, the grounding blocks (B1) and (B2) so as to function as a pair of left and right rebar receiving claws (21) (21) in the rebar supporting stand (A).
Of the grounding blocks (B1) and (B2) of the rebar receiving surfaces (13) and (13). (13) The lower muscle (14) placed on (13) can be received so as not to roll down together with the vertical part of the pillars (17) and (17). I have.

In this case, the lower reinforcing bar receiving claws (21) and (21) bent and raised by a predetermined angle (α) from the lower ends of the pillars (17) and (17) are grounded as shown in FIG. (B1) and (B2) are exposed obliquely upward from the reinforcing bar receiving surfaces (13) and (13), and the reinforcing bar receiving surfaces (13) and (13).
And an obtuse angle (β) (for example, about 115 degrees).

Therefore, the reinforcing bar receiving claw (21)
The lower muscle (14) can be smoothly dropped from above into the front-rear space between the (21) and the pedestal (17) (17), and the lower muscle (14) can be connected to the ground block (B1) (B2). Can be stably placed on the reinforcing bar receiving surfaces (13) and (13). The lower bar (14) extends along the left-right direction parallel to the top bar (18) of the reinforcing bar support stand (A), and is received by the concave reinforcing surface (19) of the top bar (18). It goes without saying that the relationship is orthogonal to the line (20).

Also, the above-mentioned rebar receiving claws (21) (21)
The grounding block (B) having a fixed length (L) is set in such a manner that the bending direction of the grounding block is in front of or behind the reinforcing bar support stand (A).
1) Since it adapts to the longitudinal direction (front-rear direction) of (B2), the length (L) of the grounding blocks (B1) and (B2) is made longer so that the thickness of the lower muscle (14) is increased. Accordingly, the angle (α) of bending of the reinforcing bar receiving claws (21) and (21) can be easily adjusted, and each of the grounding blocks (B1) and (B2) can be formed into an almost inverted camber shape without restriction. You can also do it. In that sense,
The pillars (17) and (17) and the reinforcing bar receiving claws (21) and (21) bent forward or backward from the lower ends thereof,
It is desirable to arrange them along the longitudinal center line of the ground blocks (B1) and (B2).

Further, from the pillars (17) and (17), they are temporarily buried in the grounding blocks (B1) and (B2), and are again used as the reinforcing bar receiving claws (21) and (21).
As shown in FIGS. 5 and 6, the middle part of the bend from (B2) to the exposed portion is also connected to the ground block (B) from above.
1) (B2) The concrete anchors (22) and (22) function as embedded anchors (22) and (22) around which the concrete of the concrete itself is attached. It is possible to remarkably increase the fixing strength to the reinforcing bar support stand (A) made of, and there is no possibility that the two members may be pulled out of each other, or even the unevenness may occur.

When the cover thickness (T2) of the cast concrete with respect to the upper bar (20) changes depending on the concrete structure and its arrangement, the top of the reinforcing bar support stand (A) is correspondingly changed. What is necessary is just to change the installation height (H2) of the bar (18). This can be dealt with by adjusting the vertical length of the pillars (17) (17).

In the production of the reinforcing bar spacer according to the present invention, a single round steel bar or another metal wire is press-bend-processed to form a double pillar (1) as shown in FIG.
7) An overall inverted U-shaped rebar supporting stand (A) having rebar receiving claws (21) and (21) continuously rising from the lower end of (17) is prepared and prepared.

Then, the embedded anchors (22) and (22) of the reinforcing bar support stand (A) are inserted into a molding casting (not shown) of the grounding blocks (B1) and (B2) arranged in parallel as a pair of right and left. Ground concrete (B1) (B
At the same time, each of the items 2) is molded and hardened as an inverted kamaboko mold, and the grounding blocks (B1) and (B2) shown in FIGS.
The reinforcing bar support stand (A) may be buried and integrated as shown in FIG. 6. In particular, by adopting a so-called multi-cavity casting mold for molding the grounding blocks (B1) and (B2). Can be mass-produced very easily.

The reinforcing bar spacer of the present invention can be used not only for the reinforcing bar support stand (A) which is bent substantially in an inverted U-shape as viewed from the front, but also for the pillars (17) and (17). The lower reinforcing bar receiving claw (21) which is continuously bent and raised forward or backward and is exposed tall from the reinforcing bar receiving surfaces (13) (13) of the grounding blocks (B1) (B2) by a certain height (h). ) (21), the upper and lower bars (20) and (14) for reinforcing the concrete structure can be supported at once and in an accurate vertical and horizontal orthogonal state. It can be used conveniently and well for double bar arrangement.

That is, in performing the double reinforcing work using the spacer of the present invention, as is apparent from FIGS. 7 to 9, the dam plate (1) of the concrete structure forming form (M) is used.
6) A number of reinforcing steel spacers are arranged in a dotted distribution at predetermined intervals and are grounded.

First, the reinforcing bar receiving surfaces (13) and (13) of the grounding blocks (B1) and (B2) in each spacer.
Then, for example, the lateral inferior muscle (14x) is placed from above, so that the lateral inferior muscle (14x) and the pillars (17) (17) exposed from the grounding blocks (B1) (B2) and the reinforcing steel Since it is received in a state where it does not roll down between the front and rear receiving claws (21) and (21), the vertical inferior muscle (14y) orthogonal to the horizontal inferior muscle (14x) is attached to the reinforcing bar support stand ( A), and put on the upper surface of the lateral inferior muscle (14x).

Next, the vertical bar (2), which is parallel to the position just above the vertical bar (14y), is fitted to the reinforcing bar receiving concave surface (19) of the top bar (18) in each spacer.
0y), this is the concave curved surface (1
9), the upper streaks (20x) are placed in an orthogonal state on the upper surface of the upper streaks (20y).

When concrete is subsequently poured into the double-arranged concrete structure forming frame (M), the upper bars (20x) and (20y) and the lower bars (14x) and (14y) are formed. ), The cover thickness (T2) (T1) of the cast concrete is kept constant and correctly.

The reinforcing bar support stand (A) of each reinforcing bar spacer is bent from a metal wire into an almost inverted U-shape as viewed from the front, while the grounding block (B1).
Even if (B2) is formed in an inverted kamaboko shape, the grounding blocks (B1) and (B2) have a fixed length along the front-rear direction substantially orthogonal to the top bar (18) of the reinforcing bar support stand (A). Since it extends only by (L), there is no danger that the above-mentioned reinforcing bar spacer will fall over.

Moreover, the pillars (17) and (17) of the reinforcing bar support stand (A) are bent and raised from the lower ends to the reinforcing bar receiving claws (21) and (21), and the grounding blocks (B1) ( Since the anchors (22) and (22) for retaining are buried in B2), relative pull-out and / or unevenness between the ground blocks (B1) and (B2) and the reinforcing bar support stand (A) occur. There is no fear.

Since the grounding blocks (B1) and (B2) are made of concrete having a high affinity for cast concrete, they are formed in a substantially inverted kamaboko shape forming an arcuate surface of the grounding surfaces (15) and (15). It is possible to obtain a concrete structure with an excellent appearance.

In the first embodiment of the present invention described with reference to FIGS. 1 to 9, the lower reinforcing bar receiving claws (21) and (21) of the reinforcing bar support stand (A) are connected to the grounding block (B1).
It is bent and raised so as to be exposed from the reinforcing bar receiving surfaces (13) and (13) of (B2).
As apparent from the second embodiment of FIGS. 10 and 11, as long as it stands up tall by a certain height (h) than 3), the reinforcing bar receiving claws (21) and (21) are connected to the ground block (B1).
(B2) front (11) (11) or rear (12) (1)
It may be bent to be exposed from 2).

In this case, the grounding blocks (B1) and (B2)
The clearance (S) into which the molding cast is allowed to escape is inserted into the front surface (11) (11) or the rear surface (12) (12) of the ground block (B1) (B2) and the reinforcing bar receiving claw ( 21) While securing between the opposing surfaces of (21), the rebar receiving claw (21) is used for casting.
Even if it is necessary to provide the escape recesses (23) and (23) of (21), it is still possible to manufacture the reinforcing bar spacer of the present invention.

In the first and second embodiments, the reinforcing bar receiving claws (21) and (21) of the reinforcing bar support stand (A) are
Each of the pair of left and right is bent up and down in the same front or rear direction, but also as long as it rises tall from the reinforcing bar receiving surfaces (13) and (13) of the grounding blocks (B1) and (B2) by a certain height (h). Then, as shown in the third embodiment of FIGS. 12 to 14, one of the left and right pairs may be bent forward and the other may be bent rearward. The bending angle (α) may be set to about 90 degrees, and the reinforcing bar receiving claws (21) and (21) may be suspended substantially parallel to the pillars (17) and (17). According to this, the grounding blocks (B1) and (B2) of the reinforcing bar spacers adjacent to the lower bar (14).
By this, it can be stably received and supported for the first time, but it can be said that it is worthy of adoption because it does not hinder the overall arrangement of reinforcing bars in the formwork (M).

Further, in the first to third embodiments, a concave curved surface (19) for receiving an upper reinforcing bar is provided at an intermediate portion of the top bar (18) of the reinforcing bar support stand (A). As is apparent from the fourth and fifth embodiments, a plurality of rebar receiving concave curved surfaces (19a) and (19b) having a constant height difference are formed in parallel with the top bar (18). A plurality of upper streaks (20) may be stably placed on the upper surface.

Since other configurations and usage in the second to fourth embodiments are substantially the same as those in the first embodiment, the corresponding reference numerals in FIGS. And a detailed description thereof will be omitted.

[0050]

As described above, according to the present invention, both ends of the reinforcing bar support stand (A), which is formed by bending one metal wire rod into an almost inverted U-shape viewed from the front, are formed by a pair of left and right parts. Grounding block made of concrete (B1) (B
2) In the spacer for reinforcing bars buried and integrated in each implanted state,

By shaping each of the grounding blocks (B1) and (B2) into a substantially inverted kamaboko shape having a fixed length (L) extending in the front-rear direction of the reinforcing bar support stand (A), its arc-shaped lower surface is formed. For forming concrete structures (M)
Contact surface (15) capable of substantially line contact with the weir plate (16)
(15) and the almost flat upper surface is
3) Set each as (13),

Both ends of the reinforcing bar support stand (A) are formed as a pair of right and left reinforcing bar receiving claws (21) and (21) from the reinforcing bar receiving surfaces (13) and (13) of the grounding blocks (B1) and (B2). Also, since the both ends of the reinforcing bar support stand (A) are continuously bent forward or backward so as to be exposed tall by a certain height (h), the prior art described at the beginning is used. There is an effect that all the problems can be improved.

That is, according to the above configuration of the present invention, the top bar (18) of the reinforcing bar support stand (A) bent from a single metal wire into a generally inverted U-shape as viewed from the front.
In addition, not only can the upper reinforcement (20) for reinforcing the concrete structure be placed in an extended state in the front-rear direction, but also the reinforcing-bar receiving surfaces (13) and (13) of both the grounding blocks (B1) and (B2) can be mounted. 13) The lower streaks (14) can be stably placed on the lower streaks (14) in a horizontal direction perpendicular to the upper streaks (20).

The pillars (17) and (17) of the reinforcing bar support stand (A) exposed from the ground blocks (B1) and (B2).
Similarly, as long as the lower muscle (14) is dropped from above into the front and rear space between the lower metal support catching claws (21) and (21) of the reinforcing bar support stand (A), the lower muscle (14) is This is because it is reliably received without fear of rolling down, and in that sense, the upper streaks (20x) (2
0y) and the lower muscle (14x) (14y) can also be conveniently arranged, and two types of upper muscle-specific spacer and lower muscle-specific spacer with height differences are prepared and used in combination. No inconvenience and the number of stocks can be reduced by half.

In addition, the grounding blocks (B1) (B1) are temporarily moved from the pillars (17) (17) of the reinforcing bar support stand (A).
2), the middle part of the bend until it is exposed again from the grounding blocks (B1) and (B2) as the reinforcing bar receiving claws (21) and (21) is embedded anchor (22) into the grounding blocks (B1) and (B2). As (22), since the molding concrete of the grounding blocks (B1) and (B2) is wrapped around the entire area from above as well, it is subjected to rough handling or violent vibration of the vibrator during compaction of cast concrete. Even when the reinforcing bar support stand (A) and the grounding blocks (B1) and (B2) are received, there is no danger of relative unevenness or pull-out.

The grounding blocks (B1) and (B2) maintain an affinity with the concrete structure, and are substantially inverted so as not to be largely exposed from the surface thereof so as to form arcs of the grounding surfaces (15) and (15). Although it is shaped like a Kamaboko,
The fixed lengths (L) of the grounding blocks (B1) and (B2) extend in the front-rear direction, and are formed by bending a metal wire rod into a generally inverted U-shape as viewed from the front. ) Are substantially perpendicular to the top bar (18), and therefore, the grounding blocks (B1) (B
The pair of left and right 2) can surely prevent the rebar spacer from overturning, and can stably support the upper muscle (20) and the lower muscle (14).

These effects can be achieved substantially in the same manner by adopting the structure of claim 2 or claim 3. In particular, according to the structure of claim 2, the ground block (B1) (B2) Reinforcement receiving claw (2
1) There is no need to provide the escape recesses (23) and (23) of (21), and there is an advantage that the mass production effect can be further improved.

Further, if the configuration of claim 4 is adopted,
Reinforcing bar claw (21) of the reinforcing bar support stand (A)
(21) is bent and raised obliquely upward as a fixed angle (β) crossing the reinforcing bar receiving surfaces (13) and (13) of the grounding blocks (B1) and (B2) at an obtuse angle. ) The lower muscle (14) can be more smoothly dropped between the front and rear of the (21) and the pillars (17) and (17), and the rebar arrangement workability is remarkably excellent.

If the structure of claim 5 is adopted, the upper streaks (20) can be received more and more stably, and even if the cover thickness (T2) of the cast concrete against the upper streaks (20) changes. There is also an effect that versatility corresponding to this is exhibited.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is an oblique view showing extracted reinforcing bar support stands.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 2;

FIG. 6 is a sectional view taken along line 6-6 of FIG. 2;

FIG. 7 is a perspective view showing a use state of the present invention.

FIG. 8 is a partially enlarged perspective view of FIG. 7;

FIG. 9 is a side view showing a state in which upper and lower bars are double-arranged with respect to a mold for molding a concrete structure.

FIG. 10 is a perspective view showing a second embodiment of the present invention.

FIG. 11 is a side sectional view of FIG. 10;

FIG. 12 is a perspective view showing a third embodiment of the present invention.

FIG. 13 is a plan view of FIG.

FIG. 14 is a sectional view taken along line 14-14 of FIG.

FIG. 15 is a perspective view showing a fourth embodiment of the present invention.

FIG. 16 is a front view of FIG.

[Explanation of symbols]

 (11) (11) ・ Front (12) (12) ・ Back (13) (13) ・ Reinforcing bar receiving surface (upper surface) (14) ・ Lower bar (15) (15) ・ Grounding surface (lower surface) (16)・ Weir plate (17) (17) ・ Pole (18) ・ Top bar (19) (19a) (19b) ・ Concave curved surface for reinforcing bar (20) ・ Upper bar (21) (21) ・ Reinforcing bar claw (22) ) (22)-Embedded anchor (A)-Reinforcing bar support stand (B1) (B2)-Grounding block (M)-Formwork for concrete structure molding (D)-Constant spacing (L)-Constant length (T1) ) (T2) · Cover thickness of cast concrete (h) · Constant height (α) · Bending angle (β) · Crossing angle

Claims (5)

(57) [Claims] 1. A grounding block (B1) made of a pair of right and left concrete parts at both ends of a reinforcing bar support stand (A) bent from a single metal wire into a generally inverted U-shape viewed from the front. (B2) In the reinforcing steel spacer embedded and integrated in the implanted state, each of the grounding blocks (B1) and (B2) has a substantially fixed length (L) extending along the front-rear direction of the reinforcing bar support stand (A). By shaping it into an inverted kamaboko mold, its arc-shaped lower surface is made of a weir plate (1) of a concrete structure forming frame (M).
6) The ground planes (15) and (15) that can be substantially in line contact with each other, and the substantially flat upper surface is a reinforcing bar receiving surface (13) (13).
The two ends of the reinforcing bar support stand (A) are formed as a pair of left and right reinforcing bar receiving claws (21) and (21), and the reinforcing bar receiving surfaces (13) and (13) of the grounding blocks (B1) and (B2). 1
3) For a reinforcing bar characterized in that both ends of the separated stand of the reinforcing bar support stand (A) are continuously bent forward or backward so as to be exposed at a height (h) higher than that of 3). spacer. 2. A pair of left and right reinforcing bar receiving claws (21) and (21) are provided at both ends of the reinforcing bar support stand (A).
2. The reinforcing bar spacer according to claim 1, wherein each of the spacers is bent so as to be exposed from the reinforcing bar receiving surfaces (13) of the ground blocks (B1) and (B2). 3. A pair of left and right reinforcing bar receiving claws (21) and (21) at opposite ends of the reinforcing bar support stand (A).
In each case, the front surface (1) of each ground block (B1) (B2)
2. The reinforcing bar spacer according to claim 1, wherein the spacer is bent so as to be exposed from 1) (11) or the rear surfaces (12), (12). 4. A pair of left and right reinforcing bar receiving claws (21) are provided at both ends of the reinforcing bar support stand (A).
2. The reinforcing bar according to claim 1, wherein each of the reinforcing bars is bent obliquely upward so that an angle (β) intersecting with the reinforcing bar receiving surface of each of the ground blocks (B1) and (B2) becomes an obtuse angle. Spacer. 5. A top bar (18) which horizontally spans a pair of left and right pillars (17) (17) in a reinforcing bar support stand (A).
2. The reinforcing-bar spacer according to claim 1, wherein one of the reinforcing-bar receiving concave curved surfaces (19) or a plurality of reinforcing-bar receiving concave curved surfaces (19a, 19b) having a height difference is provided.