JP3007043B2 - Reinforcing bars for concrete products - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar holder for holding reinforcing members made of reinforcing steel, which are embedded in a concrete product to reinforce the concrete product, at predetermined intervals in a concrete product manufacturing formwork.

[0002]

2. Description of the Related Art Generally, a reinforcing member buried in a concrete product such as a U-shaped groove is formed in a mesh shape by connecting a plurality of reinforcing bars vertically and horizontally, and this mesh-like reinforcing member is used for manufacturing a concrete product. Reinforcing bar holders for holding apart from the formwork engage the vertical and horizontal reinforcing bars at the intersections of the vertical and horizontal reinforcing bar rows.

As a conventional reinforcing bar holder, the present applicant has proposed a structure as shown in Japanese Patent Application Laid-Open No. 64-36851. This rebar holder has a pair of left and right support legs, a support recess formed on the upper portion of the support leg to externally support the lower rebar from below, and an upper rebar intersecting the lower rebar from the upper side. It is constituted by a pair of left and right position regulating pieces formed on both sides of the support recess so as to be pressed down above the support recess.

[0004]

In a concrete U-shaped groove provided along the shoulder of a road in Japan, only one row of vertical and horizontal reinforcing bars is buried. However, in recent years,
Domestic traffic, such as a foreign-made heavy-duty trailer exceeding domestic heavy-duty vehicles, is authorized, and the wheels of this heavy-duty trailer may move on a cover plate that covers the U-shaped groove. Due to the lack of mechanical strength of the U-shaped groove,
The U-shaped groove may be damaged. Therefore, measures have been taken to make the vertical and horizontal reinforcing bars buried in the bottom wall of the U-shaped groove used on the road shoulder into two layers. For this reason, a new problem has arisen that the above-described conventional reinforcing bar holder cannot cope with the problem. In other words, in order to arrange the newly buried vertical and horizontal reinforcing bar rows at a predetermined height from the formwork, it is necessary to prepare another reinforcing bar holder. Not only can not be carried out at the same time, there is a problem that it is necessary to prepare a different type of reinforcing steel holder.

A first object of the present invention is to solve the above-mentioned conventional problems, to maintain a predetermined interval between vertical and horizontal reinforcing bar rows of upper and lower layers embedded in a concrete product, and to set a predetermined interval from a formwork. An object of the present invention is to provide a reinforcing bar holder for a concrete product that can be supported at a height position.

A second object of the present invention, in addition to the first object, is to provide a reinforcing bar holder for a concrete product which can reliably prevent a reinforcing bar once gripped from coming out of a reinforcing bar gripping portion. It is in.

Further, a third object of the present invention is to provide the above-mentioned first embodiment.
Another object of the present invention is to provide a reinforcing bar holder for a concrete product that can stabilize the gripping state of upper and lower reinforcing bars.

Further, a fourth object of the present invention is to provide the above first object.
Another object of the present invention is to provide a rebar holding device for a concrete product that can stably hold both rebars even when upper and lower rebars are displaced in a lateral direction.

[0009]

In order to achieve the first and fourth objects, the invention according to claim 1 has a plurality of upper reinforcing bars and a plurality of lower reinforcing bars at the time of manufacturing a concrete product. And a second reinforcing member, which is disposed between the first reinforcing member and the formwork and is composed of a row of vertical and horizontal reinforcing bars, is connected to each other. A reinforcing bar supporting the first and second reinforcing members on an upper surface of the reinforcing bar, an upper reinforcing bar gripping portion for gripping a reinforcing bar of the first reinforcing member is provided at an upper end portion of the reinforcing bar holding device, and a second reinforcing bar gripping portion is provided at a lower portion thereof. A lower reinforcing bar grip portion for gripping the reinforcing bar of the reinforcing member is provided,
Further, a support leg supported on the upper surface of the formwork is provided below the lower rebar gripping portion, and the upper and lower rebar grippers are provided .
Parts are displaced from each other in the horizontal direction,
It is designed to stand upright while holding the rebar. Claim
According to the invention described in 2 above, in order to achieve the first object described above,
Multiple rebars and lower ones at the top during concrete product manufacturing
The first is formed by combining a plurality of reinforcing bars on the side in the vertical and horizontal directions.
A reinforcing member, disposed between the first reinforcing member and the formwork,
And a second reinforcing member composed of vertical and horizontal reinforcing bars is connected to each other.
And the first and second reinforcing members are supported on the upper surface of the formwork.
A reinforcing bar holding tool, the upper end of the reinforcing bar holding device
An upper rebar gripping portion for gripping the rebar of the first reinforcing member is provided,
A lower rebar gripping portion for gripping a rebar of the second reinforcing member is provided at a lower portion.
Is provided, and on the lower side of the lower rebar gripping portion,
A supporting leg supported on the upper surface, wherein the upper rebar gripping portion is provided;
Is smaller than the width of the lower reinforcing bar grip.
ing.

According to a third aspect of the present invention, in order to achieve the second object described above, in the first or second aspect , the upper and lower rebar gripping portions are provided with a supporting recess which is opened laterally, and the supporting recess is provided. A pair of upper and lower arms extending laterally from a position separated by a predetermined height from the upper and lower sides, and a pair of upper and lower arms formed integrally with the distal ends of the arms, and the distal ends are provided so as to cover the openings of the support recesses. And a pair of pressing pieces, and the both pressing pieces are formed so as to be elastically deformable when the reinforcing bar is fitted into the supporting recess.

According to a fourth aspect of the present invention, in order to achieve the third object described above, in any one of the first to third aspects,
The support leg portion includes a pair of leg portions that are opened on both left and right sides in a plane perpendicular to the reinforcing bar gripped by the support concave portion, and a connecting portion that connects the both leg portions.

[0012]

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention as a reinforcing bar holder of a two-layer vertical and horizontal reinforcing bar row of a U-shaped groove used on a road shoulder will be described below with reference to FIGS. I do.

First, a description will be given of a reinforcing bar holder 10 for supporting two layers of vertical and horizontal reinforcing bars with reference to FIGS. 1 and 2. The reinforcing bar holder 10 is integrally formed of a hard synthetic resin such as an epoxy resin. I have. A support leg 11 is integrally formed at a lower portion of the lower rebar gripping portion 12 of the rebar holder 10, and a lower end thereof is supported on an upper surface of an inner mold 30 described later. Ribs 11a that converge toward the lower end of the support leg 11 are formed at four locations at equal intervals. An upper reinforcing bar grip 14 is formed integrally with an upper portion of the lower reinforcing bar grip 12 via a connecting portion 13. The cross section of the connecting portion 13 has a cross shape.

The lower reinforcing bar gripping portion 12 has a laterally semi-cylindrical supporting recess 15 for engaging and gripping a reinforcing bar. Arm portions 16 are provided on both upper and lower sides of the support recess 15.
17 are integrally formed horizontally. Both arms 16,1
At the front end of the supporting member 7, holding pieces 18 and 19 are provided.
Are formed integrally with each other so as to be directed toward the opening.
The tips of the pressing pieces 18 and 19 are set so as to be separated from each other and to be located within the circular-arc radius area of the support recess 15. The holding pieces 18 and 19 are formed so as to be elastically deformable in the vertical direction about the connection with the arms 16 and 17 when the reinforcing bar 26 is fitted into the supporting recess 15 and gripped. The upper rebar gripping portion 14 is formed to be smaller than the width of the lower rebar gripping portion 12 as shown in FIG. 1 and, as shown in FIG. Displaced. By this displacement, the upper and lower rebars 23 and 26, which do not correspond to the upper and lower sides, are held upright by the upper and lower rebar grasping portions 14 and 12, so that the entire holder stands upright. Other configurations and functions of the upper rebar gripping portion 14 are the same as those of the lower rebar gripping portion 12, and thus, the same members are denoted by the same reference characters with "A" appended thereto and description thereof is omitted.

FIG. 2 shows a state in which the first reinforcing member 22 and the second reinforcing member 25 for the U-shaped groove are supported on the formwork 30 by the rebar holder 10. Here, both reinforcing members 22, 25
The first reinforcing member 22 includes a plurality of U-shaped bent reinforcing bars 23 arranged in a row in the left-right direction and a plurality of straight lines arranged in a column in the front-rear direction as shown in FIG. And a vertical reinforcing bar 24 are welded up and down to form an inverted U-shaped net groove as a whole. When manufacturing the U-shaped groove, the bent reinforcing bar 23 is on the upper side, and the straight vertical reinforcing bar 24 is on the lower side.

A second reinforcing member 25 for increasing the mechanical strength of the bottom of the U-shaped groove is provided below the upper portion of the first reinforcing member 22. As shown in FIG. 6, the second reinforcing members 25 include a plurality of linear horizontal reinforcing bars 26 arranged in a horizontal row and a plurality of linear reinforcing bars 26 arranged in a longitudinal direction (two in this embodiment). Are welded up and down with the same linear vertical reinforcing bar 27 to form a flat net as a whole. At the time of manufacturing the U-shaped groove, the horizontal reinforcing bar 26 is on the lower side, and the vertical reinforcing bar 27 is on the upper side. When both reinforcing members 22 and 25 are assembled, a pair of left and right vertical reinforcing bars 24 </ b> A, 24 </ b> A corresponding to the corners of the concrete formwork 30 in the vertical reinforcing bars 24 of the first reinforcing member 22.
The left and right ends of the horizontal reinforcing bar 26 of the second reinforcing member 25 are supported with respect to 24B. Accordingly, the plurality of horizontal reinforcing bars 26 of the second reinforcing member 25 are connected to the plurality of horizontal reinforcing bars 23 of the first reinforcing member 22.
And vertically displaced by the diameter of the reinforcing bar, respectively. In addition, the horizontal reinforcing bar 26 and the vertical reinforcing bars 24A, 24
B is not connected by welding or the like, but if connected at the final stage of the assembling process, the mechanical strength of the concrete U-shaped groove increases.

Next, the first and second reinforcing members 22, 25
On the other hand, a method of assembling the rebar holding tool 10 will be described with reference to FIGS. First, as shown in FIG. 3, the horizontal reinforcing bar 23 of the first reinforcing member 22 and the horizontal reinforcing bar 26 of the second reinforcing member 25
On the other hand, pressing pieces 18A, 19A, 1A of the upper reinforcing bar gripping portion 14 and the lower reinforcing bar gripping portion 12 of the reinforcing bar holder 10 are provided.
8, 19 correspond respectively. In this state, when the rebar holding tool 10 is pushed leftward in FIG.
8A, 19A, 18, 19 are elastically deformed in the vertical direction and widened as shown in FIG.
26 fits into the support recesses 15A and 15 as shown in FIG. In this state, the holding pieces 18A, 1
9A, 18 and 19 are restored by elastic force, respectively.
The horizontal reinforcing bars 23, 26 are sandwiched by the cooperation of the supporting recesses 15A, 15 and the two holding pieces 18A, 19A, 18, 19, and the horizontal reinforcing bars 23, 26 cannot escape from the supporting recesses 15A, 15 to the left. Becomes

As shown in FIG. 4, the supporting recesses 15A and 15 are located on the left side of a vertical line H passing through the center point O thereof.
Are formed so that the vertical distance between both end edges e and e is slightly larger than the outer diameter of the reinforcing bar 26, and the reinforcing bar 26 is pressed into the support recess 15 to hold the reinforcing bar 26. To ensure that

In this manner, the first reinforcing member 22 and the second reinforcing member 25 are disposed on the inner formwork 30 for manufacturing the U-shaped groove by the reinforcing bar holder 10, and the formwork 30 shown in FIG. Fresh concrete is poured into the space between the outer mold 31 and the U-shaped groove 32 as a concrete product.

Next, the structure of the reinforcing bar holder 10 of the present embodiment and the operation and effect based thereon will be described below. (A) The rebar holding tool 10 of the above embodiment includes first and second
Of the reinforcing members 22, 25 for holding the horizontal reinforcing bars 23, 26 of the reinforcing members 22, 25,
25 can be held at a predetermined interval. (B) The rebar gripping portions 14 and 12 are provided with support recesses 15A,
15, the arm portions 16A, 17A, 16, 17 and the holding pieces 18A, 19A, 18, 19, the horizontal reinforcing bars 23, 26 once engaged with the supporting recesses 15A, 15 hold the holding pieces 18A. , 19A, 18,1
9 ensures that the engagement state is maintained. (C) Since the rebar gripping portions 14 and 12 can maintain the interval between the first and second reinforcing members 22 and 25 and can support the two reinforcing members 22 and 25 on the formwork 30. There is an advantage that only one type of reinforcing bar holder is required without using a conventional reinforcing bar holder. (D) Reinforcing bar gripping part 1 of reinforcing bar holder 10 of the embodiment.
4 and 12 are displaced in the lateral direction by the outer diameter of the reinforcing bar 23, so that the entire reinforcing bar gripping tool 10 can be made to stand upright while gripping a pair of horizontal reinforcing bars 23 and 26 that do not correspond to the upper and lower sides. Can be stably supported.

Next, another embodiment of the present invention will be described with reference to FIGS.
2 will be described. (1) The reinforcing bar holder 10 shown in FIGS. 7 and 8 has the two reinforcing bars 23, 2 when the horizontal reinforcing bars 23, 26 correspond to the upper and lower sides.
The upper and lower rebar gripping portions 14, 12 correspond to the upper and lower sides so that the supporting member 6 can be stably supported. (2) The rebar holding tool 10 shown in FIG. 9 is configured such that the configuration of the upper and lower rebar gripping portions 14 and 12 is changed to support recesses 15A and 15A.
5 and elbow-shaped introduction grooves 35 and 36 for guiding the rebars 23 and 26 to the concave portions. (3) In the rebar holder 10 shown in FIG. 10, the upper rebar gripper 14 is the same as the rebar gripper 14 of the above-described embodiment, and the lower rebar gripper 12 adopts the structure of the rebar gripper 12 shown in FIG. ing. (4) The reinforcing bar holder 10 shown in FIG.
Reinforcing bar introduction grooves 37 and 38 which are directed obliquely upward at 15 are formed, and a holding piece 18A is formed above the upper introduction groove 37. (5) In the reinforcing-bar holder 10 shown in FIG.
1, 42 and a connecting portion 43 connecting the open legs 41, 42.
It consists of:

In this embodiment, the support state of the upper and lower two layers of the first and second reinforcing members 22 and 25 by the reinforcing bar holder 10 is stabilized by the pair of leg portions 41 and 42. (6) In each of the embodiments shown in FIGS. 7 to 12, the upper and lower rebar gripping portions 14, 12 may be displaced in the lateral direction as in the embodiment shown in FIGS. (7) In the above embodiments, the outer diameters of the horizontal reinforcing bars 23 and 26 are the same, and the diameters of the support recesses 15A and 15 are substantially the same as the outer diameters of the horizontal reinforcing bars. If they are different from each other, the diameters of the support recesses 15A and 15 are made different in accordance with the diameters. (8) In each of the above embodiments, the lower rebar gripping portion 12
And the support leg 11 are formed separately and connected to each other by screws or the like.

The following are technical ideas that can be considered other than the claims described in the claims. (A) The edge (e) of the inner peripheral surface of each of the support concave portions (15, 15A) having the shape of a horizontal cylinder is defined by the concave portions (15, 1).
Reinforcing bar holder for a concrete product extending laterally beyond a perpendicular H passing through the center O of 5A.

The above-mentioned reinforcing bar holder is provided with support recesses 15A, 15A.
The horizontal reinforcing bars 23 and 26 are pressed into the
It is possible to prevent the members 3 and 26 from coming out of the support concave portions. (B) The rebar holder according to any one of claims 1 to 4, wherein the concrete product is a U-shaped groove. (C) The reinforcing bar holder in a concrete product according to any one of claims 1 to 5, wherein the reinforcing bar holder is integrally formed of a synthetic resin. (D) The reinforcing bar holder for a concrete product according to any one of claims 1 to 5, wherein the width of the upper reinforcing bar gripping portion 14 is smaller than the width of the lower reinforcing bar gripping portion 12.

The above-described rebar gripper properly performs a load sharing function between the lower rebar gripper 12 where the rebar weight acts greatly and the upper rebar gripper 14 where the rebar weight is less likely to act. Can be saved.

[0027]

As described in detail above, the inventions according to claims 1 and 2 adopt the structure described in the claims, so that the space between the vertical and horizontal reinforcing bar rows of the upper and lower layers buried in the concrete product. Can be held at a predetermined interval and can be supported at a predetermined height from the mold. In particular, claim 1
The invention of the above is that even if the upper and lower rebars are displaced in the horizontal direction,
Can be held stably. Claim 2
The invention of the lower rebar gripping portion where the rebar weight acts greatly
And the upper rebar gripper, on which the weight of the rebar is less likely to act
Load sharing function properly, and material costs can be reduced.
it can.

According to the third aspect of the present invention, in addition to the effects of the first or second aspect of the present invention, it is possible to reliably prevent the rebar once gripped from falling out of the rebar gripping portion. According to the fourth aspect of the present invention, in addition to the effects of the first to third aspects, the gripping state of the upper and lower rebars can be stabilized.

[0029]

[Brief description of the drawings]

FIG. 1 is a perspective view of a rebar holder according to an embodiment of the present invention.

FIG. 2 is a side sectional view showing a use state of the reinforcing bar holder.

FIG. 3 is a side sectional view showing a step of assembling a reinforcing bar holder.

FIG. 4 is a side sectional view showing a step of assembling the reinforcing bar holder.

FIG. 5 is a partial sectional view of a U-shaped groove.

FIG. 6 is a perspective view showing an assembled state of first and second reinforcing members.

FIG. 7 is a perspective view showing another embodiment of the present invention.

FIG. 8 is a sectional view showing a use state of the reinforcing bar holder of FIG. 7;

FIG. 9 is a cross-sectional view showing another embodiment of the present invention.

FIG. 10 is a sectional view showing another embodiment of the present invention.

FIG. 11 is a sectional view showing another embodiment of the present invention.

FIG. 12 is a sectional view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Rebar holding tool, 11 ... Support leg part, 12 ... Lower rebar gripping part, 13 ... Connecting part, 14 ... Upper rebar gripping part, 15, 1
5A: Support concave portion, 16, 17, 16A, 17A: Arm portion, 18, 19, 18A, 19A: Pressing piece, 2
2, 25 ... first and second reinforcing members, 23, 26 ... horizontal reinforcing bars,
24, 27 ... vertical reinforcing bars.

Claims (4)

(57) [Claims] 1. A first reinforcing member formed by connecting a plurality of upper reinforcing bars and a plurality of lower reinforcing bars vertically and horizontally during the production of a concrete product, and a first reinforcing member and a formwork. A second reinforcing member disposed between the first and second reinforcing bars is connected to each other, and the first and second reinforcing members are formed on the upper surface of the formwork.
(2) A reinforcing bar holder for supporting a reinforcing member, wherein an upper reinforcing bar gripping portion for gripping a reinforcing bar of a first reinforcing member is provided at an upper end portion of the reinforcing bar holder, and a reinforcing bar of a second reinforcing member is gripped at a lower portion. A lower reinforcing bar grip is provided, and a support leg supported on an upper surface of the formwork is provided below the lower reinforcing bar grip ,
The upper and lower rebar grippers are displaced laterally from each other,
Standing upright with upper and lower rebar not grasping up and down
Rebar holder in concrete products that you are so. 2. A method for manufacturing a concrete product, comprising:
Connect several rebars and several lower rebars vertically and horizontally
A first reinforcing member formed by
A second reinforcing member disposed between the first and second reinforcing bars and
Are connected to each other and the first,
(2) A rebar holding tool for supporting a reinforcing member, the rebar holding device comprising:
The upper reinforcing bar that holds the reinforcing bar of the first reinforcing member at the upper end of the fixture
A grip portion is provided, and a reinforcing bar of the second reinforcing member is gripped at a lower portion.
A lower reinforcing bar grip is provided, and further below the lower reinforcing bar grip.
Provide a supporting leg portion supported on the upper surface of the formwork,
The width of the upper rebar grip is smaller than the width of the lower rebar grip
Reinforcing bars in concrete products. 3. The method of claim 1 or 2, rebar grip of the upper and lower, a support recess that opens laterally, vertically extending laterally from a predetermined height position spaced from the upper and lower sides of the support recess The arm includes a pair of arms, and a pair of pressing pieces formed integrally with the distal ends of the both arms and formed so as to cover the opening of the support recess, and the pressing pieces are formed of reinforcing steel. A reinforcing steel holder for a concrete product which is formed so as to be elastically deformable when it is fitted into a supporting recess. In any of 4. The method of claim 1, wherein the support legs and a pair of open leg portions of the open leg right and left both sides in a plane perpendicular to the rebar to be held in the supporting recess, RyoHirakiashi A reinforcing bar retainer in a concrete product constituted by a connecting part for connecting parts.