JPH08302906A - Reinforcement space holder - Google Patents

Abstract

PURPOSE: To mount reinforcing bars with a greater stability and more positively by forming a short arm and a long arm formed in their symmetrical directions and an arm formed intersectingly against the arm at right angles in a proper symmetrical shape which is identical to each other and installing both reinforcing bar mounting part and a reinforcing bar support section respectively. CONSTITUTION: A short arm 2 and a long arm 3 in the symmetrical directions and arms 4 and 4a formed intersectingly with the arms at right angles are shaped up substantially like a cross where there are installed a reinforcement fit-in part 5, which holds vertical reinforcing bars and reinforcement supports 6 and 6a which hold horizontal reinforcing bars. Then, the vertical reinforcing bars are inserted from a reinforcement insertion opening 9 while the horizontal reinforcing bars are inserted from reinforcement insertion parts 23 and 23a. Then, the insertion opening 9 and the insertion parts 23 and 23a are elastically expanded so that each of the reinforcing bars may be guided to the through hole 9 and clamping holes 19 and 19 respectively where each of the reinforcing bars are clamped and held with the through hole 9 and the clamping holes 19 and 19a substantially over the entire area. Then, a main body 1 mounted at an intersecting space of each reinforcing bar, holds a spacing with a form with the arms 2, 3, 4 and 4a and a space holding arm 24 and provides a covering thickness with high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing bar spacing holder which is installed at a crossing point of reinforcing bars embedded in a reinforced concrete construction or other concrete products to maintain a distance between the reinforcing bars and the formwork.

[0002]

2. Description of the Related Art Conventionally, various kinds of reinforcing bar interval holders made of synthetic resin have been found. For example, a reinforcing bar interval holder a as shown in FIG. 17 has its main body composed of four arm portions b, b1 ... A first cylindrical reinforcing bar holding part d for inserting and holding the vertical reinforcing bar c and a transverse reinforcing bar c1 arranged orthogonally to the first reinforcing bar holding part d. Second reinforcement holding parts d1, d2
Are provided so as to project from a pair of arms b2 and b3 on the same line, respectively. In the reinforcing bar spacing holder a having such a configuration, the second reinforcing bar holding parts d1 and d2 are the first reinforcing bar holding parts. Since it is arranged so as to be spaced apart from d, if the protruding length of the reinforcing bar end from the intersection at the end of the horizontal reinforcing bar c1 is short, one reinforcing bar holding part d2 will move the end of the horizontal reinforcing bar c1. It was not possible to hold them by sandwiching, and due to the impact generated when placing concrete, it was not possible to easily separate from the horizontal reinforcing bar c1 by the lever principle with the reinforcing bar holding part d1 as the fulcrum, and to maintain the distance from the formwork.

In concrete products such as U-shaped grooves, the reinforcing bars are bent and used. As shown in FIG.
Since c1 is slightly open outward in the state before arranging in the mold E, the bending is corrected by closing the mold e1 on the opening and closing sides with respect to the mold e on the fixed side, and the mold E The reinforcing bars c and c1 are arranged by contacting the tips of the arm portions b of the reinforcing bar spacing holder a, which holds the mold frame e1 and the reinforcing bar c with each other, to the mold frame e1. Since it is pushed in, the arm b is broken,
As a result, the space between the reinforcing bar c and the form e1 cannot be maintained sufficiently, and therefore it is not possible to secure a sufficient cover thickness for the concrete product after curing, and the strength of the concrete product is reduced. The result was.

In order to solve the above-mentioned drawbacks, the width, thickness, etc. of the reinforcing bar spacing holder a are increased as compared with the conventional ones so that the arm portions b of the reinforcing bar spacing holder a are not broken or chipped. However, since the reinforcing bar spacing holder a made of synthetic resin does not adhere to and integrate with concrete and its strength is smaller than that of concrete, the reinforcing bar spacing holder in the concrete product occupies a portion occupied by the reinforcing bar spacing holder. Since a result similar to the generation of voids, that is, almost the same as the occurrence of cracks, can be obtained. Therefore, increasing the reinforcing bar spacing retainer a significantly weakens the concrete product. It was not possible to improve the strength of the ingredients.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to the center of the rebar,
An object of the present invention is to provide a reinforcing bar spacing holder having a strength that can be stably and reliably attached regardless of the end portion and has strength that does not damage even when the formwork is assembled.

[0006]

SUMMARY OF THE INVENTION The present invention is based on the above-mentioned prior art, and in view of the problems such as the mounting stability and strength improvement of the reinforcing bar spacing holder at the ends of the reinforcing bar, the shorts formed in the symmetrical direction. In the rebar spacing holder made of synthetic resin, which is made of a synthetic resin in which the proper arm portion and the long arm portion and the arm portions formed orthogonal to these arm portions are formed in a symmetrical shape with an appropriate length, The base end is provided with a through-hole penetrating vertically, and a reinforcing-bar fitting portion is formed by opening a reinforcing-bar insertion opening obliquely provided from one side of the arm portion toward the substantially central portion of the through-hole,
Further, a holding hole orthogonal to the reinforcing bar fitting portion is provided on the arm portion having the same length, and a support piece having an inclined surface obliquely provided from above and below the holding hole toward the substantially central portion of the holding hole is provided. By projecting a reinforcing bar support part, and by disposing one reinforcing bar support part at the base end of the arm part provided with this, the protruding length of the reinforcing bar end part from the intersection part at the end part of the reinforcing bar is At least one reinforcing bar support is adjacent to the intersection of the reinforcing bars,
Reinforcing bars can be securely clamped and held by both reinforcing bar support parts, and they do not separate even when impacted during concrete pouring, and they can be installed reliably and reliably regardless of the orthogonality of the reinforcing bars and the end part. It is a solution to the problem.

Further, the long arm portion is formed in a band plate shape wider than other arm portions, and a large number of through holes are provided to improve the strength of the arm portion which is the main portion of the main body. Made me
For example, in order to improve the strength, the width and thickness of the arms of the rebar spacing holder are made large, and even if the ratio of the main body in the concrete product is larger than that of the conventional product, a large number of through holes are provided. This is to solve the above-mentioned drawbacks by making it possible to increase the adhesiveness of the concrete flowing in, thereby hardly affecting the strength of the concrete product and maintaining the original strength of the concrete product.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a main body of a reinforcing bar interval holder made of synthetic resin and integrally molded. Arm 2 and long arm 3, and these arms 2, 3
And the arm portions 4 and 4a formed orthogonally to each other are formed in a substantially cross shape having a symmetrical shape having an appropriate length and a reinforcing bar fitting portion 5 for holding the vertical reinforcing bar S, and the reinforcing bar fitting portion. Reinforcing bar support 6, which holds the horizontal rebar S1 in an orthogonal state to the vertical rebar S held in 5,
6a is provided.

The reinforcing bar fitting portion 5 is formed by forming a thick block at the lower end of the short arm portion 2 at the base end, and at the center of the block portion 7, a through hole 8 penetrating vertically is formed, and On either one of the left and right sides of the portion 7, a reinforcing bar insertion opening 9 is formed which is at the same height as the through hole 8 and is obliquely provided toward the substantially central portion of the through hole 8. And a connecting portion 10 between the reinforcing bar insertion port 9 and the through hole 8 are formed to have a width smaller than the diameter of the through hole 8. When the vertical reinforcing bar S is inserted from the reinforcing bar insertion port 9 into the through hole 8 in the reinforcing bar fitting portion 5, the reinforcing bar insertion port 9 is elastically expanded.

Further, the long arm portion 3 is connected to the other arm portions 2, 4, 4a.
In addition to being formed into a strip-like shape having a width larger than that of the main body 1, it is formed so as to extend from the intersecting portion 11 of the main body 1 with a step having a thickness substantially equal to that of the front end and has a uniform end face with the front end face of the arm portion 3. Substantially triangular fins 12 and 12a are formed so as to project outward, and projections 13 and 13a that come into contact with the mold are provided at the rear edges of the tips of the fins 12 and 12a.
Further, on the axis of the arm portion 3, projecting ribs 14 and 14a, which stand up and down so as to be orthogonal to this, are formed so that the tips of the ribs 14 and 14a are tapered fins 15 up and down, respectively. 15
In addition to projecting a, only the trailing edge corner portions 16 and 16a of the tips of the fins 15 and 15a are provided on the same plane as the protrusions 13 and 13a.

Reference numerals 17 and 17a are penetrating holes formed in a large number in the left and right portions of the arm portion 3 which are divided into left and right parts by the ribs 14 and 14a. The penetrating holes 17, 17a are elliptical in the drawing. Although it is a shape, it may be formed in a triangular shape like the reinforcing bar spacing holder shown in FIGS. 9 to 15, or a circular shape, a square shape, although not shown.
It may be formed in another polygonal shape, and the ribs 14 and 14a may be provided with through holes 17, 17a ...

Reinforcing bar support portions 6 and 6a are formed by forming outer peripheral wall surfaces in a substantially cylindrical shape so as to project on arm portions 7 and 7a.
The base 18 of 6a, the holding hole 19 orthogonal to the reinforcing bar fitting portion 5,
An inclined surface that extends through 19a and is inclined from the upper and lower ends of the reinforcing bar supporting portions 6 and 6a toward the substantial center of the holding holes 19 and 19a.
Forming supporting pieces 21, 21a, ..., having inclined surfaces 20, 20a ... lower end edges 22, 22a ... forming part of arcs of the holding holes 19, 19a. Support piece
The gap between 21, 21a, ... Is formed by the reinforcing bar insertion portions 23, 23a, and the holding hole 1 is sandwiched from the reinforcing bar insertion portions 23, 23a in the reinforcing bar supporting portions 6, 6a.
When inserting the horizontal rebar S1 into 9, 19a, the supporting pieces 21, 21a ...
Is designed to expand elastically.

In the drawing, the inclined surfaces 20, 20b of the front support pieces 21, 21b are formed only on the inner side of the reinforcing bar fitting portion 5 side, and the outer side is formed in a vertical plane. Like the rear support pieces 21a and 21c, the front support pieces 21 and 21b may be provided with the inclined surfaces 20 and 20b over the entire width thereof.

Further, like the reinforcing bar spacing holders shown in FIGS. 9 to 15, both sides of the reinforcing bar supporting portions 6 and 6a are formed in vertical planes, and the front supporting pieces 21 and 21b are connected to the reinforcing bar fitting portion 5. The inclined surfaces 20 and 20b are formed only on the inner side portion, and the outer side is formed in a vertical plane shape, and the rear support pieces 21a and 21c are formed on the inner side portion on the rebar fitting portion 5 side in a vertical plane shape. , The inclined surfaces 20a, 20c are formed only on the outer side, and the inclined surfaces of the support pieces 21, 21a ...
20, 20a ... May be formed so as to alternately project.

Further, the reinforcing bar supporting portions 6 and 6a may be arranged at symmetrical positions on the arm portions 4 and 4a having the same length, that is, at equal intervals from the intersection portion 11 of the main body 1, but it is preferably shown in the drawing. In this way, one reinforcing bar support 6 is arranged at the base end of the arm 4, and the other reinforcing bar support 6a is arranged substantially at the center of the arm 4a.

Reference numeral 24 is a space-holding leg vertically provided at the lower portion of the intersecting portion 11 of the main body 1. The space-holding leg 24 is formed in a cross shape in cross section, and its tip end is formed in a tapered shape.

Although the spacing legs 24 are shown to have a cross-shaped cross section, the spacing legs are not limited to this and may have a round bar shape with their tips formed in a substantially conical shape. It is not necessary to form the space holding legs 24 unlike the reinforcing bar space holding tool shown in FIG.

Further, 25 is a rib formed to project in the longitudinal direction of the lower surface of the short arm portion 2, and 26 and 26a are ribs formed to project in the longitudinal direction of the lower surface of the arm portions 4 and 4a having the same length.

Next, the operation of the reinforcing bar spacing holder according to the present invention will be described. The reinforcing bar insertion port 9 in the reinforcing bar fitting portion 5 will be described.
By inserting the vertical rebar S from, and inserting the horizontal rebar S1 from the rebar insertion portions 23, 23a of the rebar support portions 6, 6a,
The reinforcing bar insertion port 9 and the reinforcing bar insertion portions 23, 23a are elastically expanded due to their material characteristics, and the reinforcing bars S, S1 are inserted through the through hole 8 and the holding hole, respectively.
Guide to 19 and 19a, elastically return after passing the reinforcing bars S and S1,
The distance between the communicating portion 10 of the reinforcing bar fitting portion 5 and the lower end edges 22, 22a of the reinforcing bar supporting portions 6, 6a is narrower than the diameter of the through hole 8 and the holding holes 19, 19a.

In this state, since the through hole 8 and the holding holes 19 and 19a are both formed in a substantially arcuate cross section,
Holds the reinforcing bars S, S1 in a substantially circumferential direction in a sandwiched manner,
The vertical reinforcing bar S and the horizontal reinforcing bar S1 are supported in an intersecting state on the intersecting portion 11 of the main body 1.

As described above, the main body 1 attached to the intersection of the reinforcing bars S and S1 has arms 2, 3, 4, depending on the attachment state.
An accurate cover thickness is obtained by maintaining the space between the mold and the frame with 4a and the space holding legs 24.

Even when the end of the horizontal rebar S1 is shorter than the end of the transverse rebar S1, the one rebar support portion 6 is at the base end of the arm 4, that is, the cross of the rebars S and S1. Since it is arranged at a position adjacent to the point, the distal end of the horizontal reinforcing bar S1 is securely clamped and held, so that the horizontal reinforcing bar S1 is stably and reliably clamped and held by both reinforcing bar supporting portions 6 and 6a. it can.

Further, the main body 1 is provided with the projections 13 and 13a provided on the fins 12 and 12a of the arm 3 and the rear edge corners 16 and 16a of the fins 15 and 15a of the ribs 14 and 14a on the same plane. For the body 1
Since the main body 1 can be stably supported upright at the four points of the projections 13 and 13a and the rear edge corners 16 and 16a, the grid-shaped reinforcing bars arranged horizontally can be stably supported horizontally and the formwork The distance between the arm 3 and the arm 3 can be accurately maintained, and the arm 3 is floated from the inner surface of the form due to the protrusions 13 and 13a and the trailing edge corners 16 and 16a, so that the arm 3 is not directly exposed on the concrete surface. Exposure to the surface of the concrete product does not impair the strength and aesthetics of the concrete product.

[0024]

In summary, according to the present invention, the short arm portion 2 and the long arm portion 3 formed in the symmetrical direction and the arm portions 4 and 4a formed orthogonal to the arm portions 2 and 3 are appropriately the same. In a reinforcing bar spacing holder made of synthetic resin having a symmetrical length, a short through arm 8 is provided at the base end of the short arm 2, and the through hole 8 is penetrated from one side of the arm 2. A reinforcing bar fitting portion 5 is provided by opening a reinforcing bar insertion opening 9 obliquely provided toward the substantially central portion of the hole 8, and the reinforcing bar fitting portion 5 is orthogonal to the arm portions 4 and 4a having the same length. A supporting piece provided with the holding holes 19 and 19a, and having inclined surfaces 20, 20a which are obliquely provided from above and below the holding holes 19 and 19a toward the substantial center of the holding holes 19 and 19a.
Since the reinforcing bar supporting portions 6 and 6a provided with 21, 21a ...
The reinforcing bar fitting part 5 and the reinforcing bar supporting parts 6 and 6a are elastically expanded when the reinforcing bar insertion port 9 and the supporting pieces 21 and 21a pass through the reinforcing bars S and S1 due to their material characteristics, and the reinforcing bars S and S1 are penetrated through the through holes 8, Clamping hole 19,
After being guided to 19a, it elastically returns to the through hole 8 and the nipping hole.
By narrowing the open sides of the reinforcing bars S and S1 of the 19 and 19a, and forming the through hole 8 and the clamping holes 19 and 19a in a cross section having an arc shape, it is possible to clamp and hold almost the entire area around the reinforcing bars S and S1, Therefore, the reinforcing bars S and S1 can be easily held and held, and the workability can be improved by preventing them from coming off, and the reinforcing bars S and S1 can be prevented from being separated from the reinforcing bars S and S1 due to an impact when placing concrete. By the main body 1 formed, the vertical rebar S and the horizontal rebar S1 can be attached with good stability in both the vertical and horizontal directions.

Further, the long arm portion 3 is formed in the shape of a strip plate which is wider than the other arm portions 2, 4, 4a, and a large number of through holes 1 are formed.
7, 17a ... are provided, so that the arm portion 3 serving as the main portion of the main body 1
Even if the reinforcing bars S and S1 are pushed into the mold by the main body 1 during the assembly of the mold, the arm 3 abutting against the inner surface of the mold is not broken or damaged, and the reinforcing bar S and the mold are not damaged. It can be held at a predetermined interval, and the width, thickness, etc. of the arm 3 of the main body 1 are made large in order to improve the strength, and the ratio of the main body 1 in the concrete product is larger than that of the conventional product. Even if the concrete flows into a large number of through holes 17, 17a ..., its adhesiveness is increased, so that the strength of the concrete product is hardly affected and the original strength of the concrete product can be maintained.

Further, since one of the reinforcing bar supporting portions 6 and 6a is arranged at the base ends of the arm portions 4 and 4a provided with the reinforcing bar supporting portions 6 and 6a, particularly at the end portion of the horizontal reinforcing bar S1, the end portion protruding from the intersection point thereof. Even if the length is short, since the reinforcing bar support portion 6 is arranged at the base end of the arm portion 4, that is, at the position adjacent to the intersection of the reinforcing bars S and S1, the tip end of the horizontal reinforcing bar S1 is securely clamped. Therefore, the horizontal reinforcing bars S1 can be stably and securely sandwiched and held by both reinforcing bar supporting portions 6 and 6a, and the reinforcing bars do not separate even when impacted during concrete pouring, and the reinforcing bars are perpendicular to each other and end portions. It can be installed with good stability regardless of.

Further, since the inclined surfaces 20, 20a provided on the opposing support pieces 21, 21a ... Are formed alternately, when the horizontal reinforcing bar S1 is sandwiched between the reinforcing bar supporting portions 6, 6a, the horizontal reinforcing bar S1 and the horizontal reinforcing bar S1 are inclined. Face 2
0, 20a ... Supporting pieces 21, 21a ... with reduced contact resistance with
Of the arm 4 is made smooth by applying force to improve the wearability of the arm 4 even if the end protruding from the intersection of the ends of the horizontal reinforcing bar S1 is short. Inclined surface 2 of supporting pieces 21, 21a in reinforcing bar supporting portion 6 provided at the end
0, 20a One of the lower end edges 22, 22a is always located near the intersection of the reinforcing bars S, S1 and holds the horizontal reinforcing bar S1 in the holding hole 18, so that the horizontal reinforcing bar S1 easily comes out of the reinforcing bar supporting portion 6. In fact, the mounting state of the main body 1 of the reinforcing bars S and S1 can be maintained stably, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a front view of a reinforcing bar spacing holder according to the present invention.

FIG. 2 is a rear view of FIG.

FIG. 3 is a plan view of FIG.

FIG. 4 is a bottom view of FIG.

5 is a left side view of FIG. 1. FIG.

FIG. 6 is a right side view of FIG. 1.

FIG. 7 is a perspective view of a reinforcing bar spacing holder.

FIG. 8 is an enlarged perspective view of a reinforcing bar supporting portion.

FIG. 9 is a front view showing another embodiment.

FIG. 10 is a rear view of FIG.

FIG. 11 is a plan view of FIG.

FIG. 12 is a bottom view of FIG.

FIG. 13 is a left side view of FIG.

FIG. 14 is a right side view of FIG.

FIG. 15 is a perspective view of a reinforcing bar spacing holder.

FIG. 16 is an enlarged perspective view of a reinforcing bar support portion.

FIG. 17 is a perspective view showing a conventional reinforcing bar interval holder.

FIG. 18 is a simplified cross-sectional view showing a usage state of a conventional reinforcing bar spacing holder.

[Explanation of Codes] 2 Arms 3 Arms 4, 4a Arms 5 Reinforcing Bar Fittings 6, 6a Reinforcing Bar Supports 8 Through Holes 9 Reinforcing Bar Inserts 17, 17a ... Penetrating Holes 19, 19a Holding Holes 20, 20a ... Inclined surface 21, 21a… Support piece

Claims (3)

[Claims] 1. A synthetic resin in which a short arm and a long arm which are formed in a symmetrical direction and a long arm, and an arm which is formed orthogonal to these arms are formed in a symmetrical shape having an appropriate length. In the reinforcing bar spacing holder, a through hole that vertically penetrates is provided at the base end of the short arm part, and a reinforcing bar insertion opening that is obliquely provided from one side of the arm part toward the substantially central part of the through hole is opened. And a holding hole which is orthogonal to the reinforcing bar fitting portion is provided on the arm portion having the same length, and is inclined from above and below the holding hole to a substantially central portion of the holding hole. A reinforcing bar supporting portion provided with a supporting piece having an inclined surface is provided in a protruding manner, and the long arm portion is formed in a strip plate shape wider than other arm portions,
A reinforcing bar spacing holder characterized in that a large number of through holes are provided. 2. The reinforcing bar spacing holder according to claim 1, wherein one of the reinforcing bar supporting portions is arranged at the base end of the arm portion provided with the supporting portion. 3. The reinforcing bar spacing holder according to claim 1, wherein the inclined surfaces provided on the opposing support pieces are formed alternately.