JP2889498B2 - Rebar spacing tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rebar spacing holder for holding a rebar set apart from a forming mold.

[0002]

2. Description of the Related Art In general, as shown in FIG. 6, there is provided a rebar spacing holder 21 for holding a rebar set embedded in a concrete product in a state of being floated from a forming mold. That is, the insertion support portion 22 is formed in a cylindrical shape, and is inserted into the horizontal reinforcing bar. The space holding portion 23 is composed of a pair of long and short holding arms 24 formed on the outer peripheral surface of the distal end of the insertion support portion 22 so as to be orthogonal to the insertion support portion 22. The rebar holding portion 25 includes a pair of support arms 26 formed on both sides of the base end of one holding arm 24 so as to be orthogonal to the holding arm 24.
On the upper surface of the base end portion of the support arm 26, a column-shaped holding piece 27, 2
8 are erected in pairs.

The holding pieces 27 and 28 project from the support arm 26 at a predetermined interval from each other, and have an outer wall surface formed in an arc shape. As shown in FIG. It has a fan shape that is symmetrical with respect to the center line of the support arm 26 when viewed. When the vertical reinforcing bars come into contact between the holding pieces 27 and 28, the holding pieces 27 and 28 bend outward to the same extent, and the vertical reinforcing bars are held by the holding recess 29.

[0004] By mounting the rebar spacing holder 21 at the intersection of the horizontal rebar and the vertical rebar, the rebar set is held in a floating state in the formwork. As shown in FIG. 7, the rebar spacing holder 21 is injection-molded using a molding die 31 including a fixed die 32 and a movable die 33. The holding arm 2 of the rebar spacing holder 21
4 and the upper surface of the support arm 26 are a PL (parting line) surface between the two dies 32 and 33, and the fixed
A molding die 34 corresponding to a shape excluding 7 and 28 is formed. A tubular pin hole 35 is formed in the movable mold 33 at a position corresponding to the holding pieces 27 and 28. Although not shown, pin holes for the other holding pieces 27 and 28 are formed on the back side in FIG.

[0005] The cylindrical nesting pin 36 is formed at its tip with an upper-side keyhole-shaped forming part 37 having a shape corresponding to the symmetrical holding pieces 27 and 28, and is inserted and arranged in the pin hole 35. ing. Then, the fixed die 32 and the movable die 33 are joined, and after the injection molding, the movable die 33 is retracted, so that the pushing pin 38 is protruded, and the molded portion 37 of the nesting pin 36 and the holding portions 27 and 28 are forcibly removed. Then, the rebar spacing holder 21 is released from the molding die 31. Although not shown, the shape of the molding portion of the nesting pin for the other holding pieces 27 and 28 appears symmetrically with the nesting pin 36 and is inserted and arranged in the other pin hole.

However, there is a case where the reinforcing bar set has a vertical reinforcing bar that is thinner than the above. In order to obtain a corresponding rebar spacing holder (not shown),
Pin hole 35 of movable mold 33 as much as the diameter of the vertical reinforcing bar is reduced.
Of the nesting pin (not shown), the diameter of the circular portion 39 of the molding portion 37 is also adjusted by the nesting pin 36. In this case, a separate nested pin which is smaller than that of the conventional method has to cope with the problem, resulting in an increase in cost.

Therefore, conventionally, in order to share the movable mold 33 by using the position of the pin hole 35 as it is, the nesting pin 36 has a nesting shape having a molding portion 43 shape as shown by a two-dot chain line in FIG. In place of the pin 42, the rebar spacing holder 41 corresponding to the case where the vertical rebar is thin is formed at a reduced cost. That is, the molding part 4 of the nesting pin 42
The diameter of the circular portion 44 in 3 is smaller than that of the nesting pin 36, and the forming portion 44 fits the entire forming portion 37 of the nesting pin 36 toward the insertion support portion 22 (left side in FIG. 8).
The shape is shifted from the shape shown in FIG.

[0008] Accordingly, the rebar spacing holder 41 corresponding to the thin vertical rebar obtained by using the nesting pin 42 is shown in FIG.
The holding pieces 45 and 46 are shaped as shown in FIG. That is, one of the holding pieces 45 has an amount corresponding to that the molding portion 43 of the nesting pin 42 is entirely shifted toward the insertion / support portion 22.
Both the thickness L2 and the width H2 are wider than the rebar holding bracket 21, and the other corresponding holding piece 46 is narrower in both the thickness L3 and the width H3.

[0009]

However, the holding piece 4
When the shape of each of the holding members 46 is reduced, the thickness L and the width H are easily reduced.
It becomes difficult to bend the widened holding piece 45. That is, when the vertical rebar is inserted into the rebar spacing holder 41, the two holding pieces 45 and 46 are not expanded in a well-balanced manner, and the narrow holding piece 46 is mainly deformed. Therefore, there has been a problem that the amount of deformation of the holding piece 46 is increased and the holding piece 46 is easily damaged.

[0010] Although not shown, in the case where the vertical reinforcing bar is thicker, the displacement direction of the molded portion 43 in the nesting pin 42, that is, the holding piece 45,
The thickness relationship of 46 is reversed, and the thickness L2 and the width H are also the same.
The holding piece 45 on the side where 2 became narrow was easily damaged.

SUMMARY OF THE INVENTION The present invention has been made in view of the problems existing in the prior art described above, and has as its object to form the reinforcing bar gap holding tool before the change even when the diameter of the vertical reinforcing bar is changed. It is an object of the present invention to provide a rebar spacing holder that shares a tooling die and does not reduce the strength of a holding piece.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, a tubular insertion support portion for inserting and supporting a horizontal reinforcing bar intersects with an axis of the insertion support portion. A space holding portion that is integrally formed in the direction and holds the reinforcing bar set in a floating state in the formwork, and a reinforcing bar holding portion that is integrally formed on the upper surface of the spacing holding portion and holds the vertical reinforcing bar. The department is
This is a rebar spacing holding tool which is constituted by a pair of holding pieces and further has a thickness of one holding piece wider than a thickness of the other holding piece and a width smaller than the width of the other holding piece.

According to the second aspect of the present invention, the thickness of the one holding piece and the width of the other holding piece, and the one width and the other thickness are substantially the same length. According to the third aspect of the present invention, a reinforcing portion is provided at an end of the insertion support portion on the side of contact with the forming mold, and a contact portion that makes point contact with the forming mold is formed on the reinforcing portion. It is.

[0014]

According to the first aspect of the present invention, the thickness of one holding piece is made wider than the thickness of the other holding piece, and the width is made narrower than the other holding piece. In other words, only by changing the nesting pin, the rebar spacing holder for the rebar set before changing the diameter of the vertical rebar and the forming die are used in common, and it becomes narrower by the changed diameter of the vertical rebar. The width of the one holding piece is made wider than the width of the other holding piece corresponding to the thickness of the other holding piece. Therefore, unlike the related art, one of the holding pieces does not become narrower in both thickness and width than the other, and it can be prevented that the strength becomes weaker.

According to the second aspect of the present invention, the thickness of one of the holding pieces and the width of the other holding piece and the width of one of the holding pieces are made substantially equal to each other, so that the vertical reinforcing bar is inserted into the holding portion of the reinforcing bar. In this case as well, the degree of bending of the two holding pieces becomes substantially equal, and it is possible to prevent the amount of deformation from being biased to one side and prevent damage.

According to the third aspect of the present invention, since the reinforcing portion is provided with a contact portion which is in point contact with the molding frame, the end of the insertion support portion is not easily exposed on the surface of the concrete product. The external fitting of the concrete product can be kept good.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 4, in the state where the rebar spacing holder 1 of the present embodiment is mounted on the rebar set T, the rebar set T
At the same time, it is arranged in a mold K for molding a concrete product. The reinforcing bar set T is formed by welding such that a vertical reinforcing bar T1 formed linearly in the front side direction from the back side of the paper surface of FIG. 4 and a horizontal reinforcing bar T2 formed linearly in the vertical direction are orthogonal to each other. This vertical rebar T1 is a rebar spacing holder 2 shown in FIG.
1 is thinner than the corresponding vertical reinforcing bar. Then, the rebar spacing holder 1 is attached to the intersection of the vertical rebar T1 and the horizontal rebar T2 at the lowest stage of the rebar set T.

As shown in FIG. 1, the rebar spacing holder 1 is composed of a fitting support part 2, a spacing holding part 3, and a rebar holding part 4, and is integrally formed of synthetic resin. The insertion support portion 2 is formed in a cylindrical shape, and is inserted into the horizontal reinforcing bar T2.
The space holding portion 3 has a first holding arm 5 formed at the end of the insertion support portion 2 so as to be orthogonal to the insertion support portion 2, and a second holding arm formed on the opposite side of the first holding arm 5. It consists of an arm 6. The first holding arm 5 is longer than the second holding arm 6 and is formed to have a length such that the distance between both ends of both arms 5 and 6 is substantially equal to the distance between the inner walls of the forming frame K.

The rebar holding portion 4 has a pair of support arms 7 formed at both ends of the base end of the second holding arm 6 so as to be orthogonal to the second holding arm 6. The support arm 7 is tapered and formed in a linear shape having a predetermined length capable of supporting the vertical reinforcing bar T1. A pair of holding pieces 8 and 9 each having a columnar shape are provided upright on the upper surface of the base end of the support arm 7. The holding pieces 8 and 9 are formed so as to protrude from the support arm 7 while being separated from each other by a predetermined distance, and the outer wall surfaces thereof are formed in an arc shape. Further, a semicircular holding concave portion 10 is formed between the lower portions of the inner wall surfaces of the holding pieces 8 and 9 facing each other, so that the vertical reinforcing bar T1 can be held while being supported on the support arm 7.

Further, an oblique guide surface 11 is formed which extends outward from the center of the inner wall surface of the holding pieces 8 and 9 to the front end surface. When the vertical reinforcing bar T1 is pressed against the guide surface 11, the holding pieces 8 and 9 are spread outward by the pressing, and the vertical reinforcing bar T1 is held by the holding recess 10. Then, each pair of holding pieces 8 and 9 hold the vertical reinforcing bar T1 in the holding recess 10 in a state where the vertical reinforcing bar T1 is supported on the support arm 7, and the reinforcing bar interval holding tool 1 rattles in the vertical direction in FIGS. Is prevented.

As shown in FIG. 2, in this embodiment, each of the pair of holding pieces 8 and 9 has a thickness L1 of one holding piece 8.
Are substantially the same as the width H2 of the other, and the width H1 of one holding piece 8 is substantially the same as the thickness L2 of the other holding piece 9. That is, the symmetrical holding piece 27 shown in FIG.
As compared with the rebar spacing holder 21 having the holding member 28, the one holding piece 9 is formed to have a width H2 wider than the other holding piece 8 by an amount corresponding to the reduced thickness L2, and the elastic force of the other holding piece is reduced. 8 is substantially the same as FIG.

Now, as shown in FIG. 4, the rebar spacing holder 1 is attached to the intersection of the vertical rebar T1 and the horizontal rebar T2 at the bottom of the rebar set T. First, the horizontal reinforcing bar T2 is inserted into the fitting support portion 2 of the reinforcing bar interval holding tool 1. Next, the guide surfaces 11 of the pair of holding pieces 8 and 9 are brought into contact with the vertical reinforcing bar T1. Next, in this state, when the entire rebar spacing holder 1 is pushed in, each of the holding pieces 8 and 9 is pushed open against its elasticity,
The vertical reinforcing bar T1 enters the holding recess 10 and is held.
At this time, the two holding pieces 8 and 9 have different thicknesses L and widths H,
As described above, since the total elastic force is substantially the same, it is bent and expanded to the same extent.

When the rebar set T on which the rebar spacing holder 1 is mounted is arranged in the formwork K, the rebar set T comes into contact with the end of the insertion support portion 1 and the inner bottom surface of the formwork K. Supported by Further, the reinforcing bar T is held by the first and second holding arms 5 and 6 of the interval holding section 3 in a state of being separated from the molding frame K. Then, concrete is poured into the inside of the mold frame K to form a desired concrete product.

The rebar spacing holder 1 is obtained as follows. That is, as shown in FIGS. 6 and 7, the rebar spacing holder 21 and the fixed mold 32 and the movable mold 33 are shared, and the rebar spacing holder 1 of this embodiment is formed only by replacing the nesting pins 36. . As shown in FIG. 3, the nesting pin 13 of the present embodiment has a molding portion 14 formed at a tip end thereof.
However, it forms a pillar having a keyhole shape on the upper surface. The molding part 14 is shifted as a whole toward the insertion support part 2 (in the direction of the arrow X), and the side wall 15 of the molding part 14 is
The side is high and the other side is low. That is, the concave portion 16 on the front side of the drawing at the tip of the nesting pin 13 is
And the height S1 of the side wall 15
Corresponds to the width H2 of the holding piece 9 and the edge length E1 of the pin tip.
Corresponds to the thickness L2. The recess 17 on the opposite side to the arrow X direction has a shape corresponding to the other holding piece 8. That is, the side wall 15 (S
2) corresponds to the width H1 of the holding piece 8, and the edge length E2 of the pin tip corresponds to the thickness L1 of the holding piece 8.

The nesting pin 13 is inserted into the pin hole 35 in the molding die 31 shown in FIG. The steps are the same as in the prior art, and a description thereof will be omitted.

As described above, in the rebar spacing holder 1 of this embodiment, even when the vertical rebar T1 becomes thinner, the nesting pin 36 shown in FIGS.
The nesting pin 13 having the shape shown in FIG. 6 can be used to share the rebar spacing holder 21 and the molding die 31 shown in FIG. 6, and the manufacturing cost can be reduced. In addition, the elasticity of the holding pieces 8 and 9 becomes substantially the same, and when the reinforcing bar holding section 4 is expanded, both holding pieces 8 and 9 are deformed to the same extent,
On the other hand, stress due to the pushing of the vertical rebar T1 is not concentrated. Therefore, breakage of the holding pieces 8 and 9 can be prevented.

It should be noted that the present invention is not limited to the above-described embodiment, and may be made as follows without departing from the spirit of the present invention. (1) The tip of the insertion support portion 2 is changed to a shape as shown in FIG. That is, in the reinforcing portion 18 for reinforcing the end portion of the insertion support portion 2, two semi-disc-shaped plate-like bodies 19 are formed in a cross shape at the tip of the insertion support portion 2. The distal ends of these plate-like members 19 are formed in an arc shape, and the periphery of the intersection of the two plate-like members 19 is brought into point contact with the form K as a contact part 20. In this way, it is possible to prevent molding defects due to sink marks and the like during molding of the concrete product. (2) The relationship between the thickness and width of the holding pieces 8 and 9 is reversed. In other words, this is a rebar spacing holder that is compatible with the case where the diameter of the vertical rebar T1 is larger than the rebar spacing holder 21 shown in FIG. In this manner, the reinforcing bar gap holder 21 and the molding die 31 are shared, the cost can be reduced only by replacing the nesting pins 36, and one holding piece does not become weak in strength. (3) In the above embodiment, the first holding arm 5 is embodied in the rebar spacing holder 1 formed to be longer than the second holding arm 6.
However, by changing this, the first holding arm 5 is
The embodiment is embodied in a rebar spacing holder having the same length as the above or shorter than the second holding arm 6.

The technical ideas other than the claims that can be grasped from the above embodiment will be described below together with their effects. (1) The reinforcing-bar spacing holder according to claim 3, wherein the reinforcing portion (18) is configured so that a plurality of plate-like bodies (19) intersect, and the contact portion (20) with the formwork (K) is formed at the intersection.

In this way, it is possible to prevent molding defects due to sink marks and the like during the molding of concrete products.

[0030]

As described above in detail, according to the first aspect of the present invention, the diameter of the vertical rebar is formed by sharing the rebar spacing holder before the change and the molding die. It can suppress that the intensity | strength of one holding piece of an interval holding tool falls.

According to the second aspect of the present invention, even when the vertical reinforcing bar is inserted into the reinforcing bar holding portion, the degree of bending of both holding pieces becomes substantially equal, and the deformation amount is biased to one side, and damage is caused. Can be prevented.

According to the third aspect of the invention, the external fitting of the concrete product can be kept good.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment embodying the present invention, and is a perspective view of a rebar spacing holder.

FIG. 2 is an enlarged partial top view showing a reinforcing-bar holding portion.

FIG. 3 is an enlarged perspective view showing a distal end portion of the nesting pin.

FIG. 4 is a cutaway view showing a use state of the reinforcing bar interval holding tool.

FIG. 5 is a perspective view showing another example of the shape of the distal end portion of the insertion support portion.

FIG. 6 is a perspective view showing the rebar spacing holder before changing the diameter of the vertical rebar, which shares the rebar spacing holder of the present embodiment with a molding die.

FIG. 7 is a cross-sectional view showing a molding die for molding the rebar spacing holder shown in FIG.

FIG. 8 is a front view showing a nesting pin used for molding the rebar spacing holder shown in FIG.

9 (a) is a top view showing a reinforcing bar holding portion of the reinforcing bar gap holding device shown in FIG. 6, and FIG. 9 (b) is a reinforcing bar holding portion of the conventional reinforcing bar gap holding device corresponding to a case where a vertical reinforcing bar is thin. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rebar spacing holder, 2 ... Insert support part, 3 ... Spacing holding part, 4 ... Rebar clamping part, 8 ... Clamping piece, 9 ... Clamping piece, 18 ...
Reinforcing part, 20: contact part, H: width of holding piece, K: forming frame, L: thickness of holding piece, T: rebar set, T1: vertical reinforcing bar, T
2. Horizontal bars.

Claims (3)

(57) [Claims] Claims: 1. A rebar spacing retainer attached to an intersection of a horizontal rebar and a vertical rebar for disposing a rebar set composed of both rebars in a state separated from a molding form of a concrete product, A tubular insertion support portion that inserts and supports the horizontal reinforcing bar, and an interval holding portion that is integrally formed in a direction that intersects with the axis of the insertion insertion support portion and that holds the reinforcing bar set in a floating state in the mold. The rebar holding portion is formed integrally with the upper surface of the gap holding portion and holds the vertical rebar. The rebar holding portion is constituted by a pair of holding pieces, and furthermore, the thickness of one holding piece is reduced by the other. A rebar spacing holder having a width greater than the thickness of the holding piece and a width smaller than the width of the other holding piece. 2. The rebar spacing holder according to claim 1, wherein the thickness of the one holding piece and the width of the other holding piece, and the one width and the other thickness are substantially the same. 3. A reinforcing portion is provided at an end of the fitting and supporting portion on the side in contact with the forming mold, and a contact portion which is in point contact with the forming mold is formed on the reinforcing portion. 5. The reinforcing bar spacing retainer according to 4.