JPH10159259A - Reinforced concrete spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent the bending of a reinforcing bar definitely during construction time with regards to a plurality of reinforced concrete spacers which are laid out with a specified spacing in the longitudinal direction of a reinforcing bar when construction a reinforced concrete-made side wall. SOLUTION: A spring member 5 is fixed with the inner part 4a of a reinforcing bar introduction hole 4 of a main body 2 comprising a molded piece, such as concrete. The spring member 5 has a channel-like fixing part fixed with a holding recess 43 of the main body 2 and a pair of double leg-like clamping parts which clamp a reinforcing bar. Since the spring member 5 can hold the reinforcing bar elastically, it prevents a spacer 1 from dropping out of the reinforcing bar and moving in the longitudinal direction, which makes it possible to maintain a definite space between each spacer as a result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate-shaped reinforced concrete spacer which is used by being fitted into a reinforcing bar in order to surely maintain an interval between a reinforcing bar and a formwork when a reinforced concrete side wall or the like is constructed.

[0002]

2. Description of the Related Art As a spacer used for constructing a side wall of reinforced concrete or the like, a reinforcing disk introduction groove is formed in a substantially disk-shaped main body from the outer periphery to a central portion thereof. There was something. With such a reinforcing-bar introduction groove, the spacer can be introduced radially at an arbitrary position in the longitudinal direction of the long reinforcing bar, which is convenient.

In order to suppress the bending of a long reinforcing bar,
It is necessary to arrange a plurality of spacers on the rebar of a book, and these spacers need to maintain a certain span between each other. This is because if the span interval is too wide, the bending of the reinforcing bar between the spans becomes large, and the interval between the reinforcing bar and the formwork becomes narrow.

[0004] However, when a concrete having a large weight is poured in vigorously, the spacer is pushed in the longitudinal direction of the rebar by the pressure of the poured concrete and is easily moved, and the spacer comes off the rebar. In such a case, the gap between the mold and the reinforcing bar cannot be maintained. Therefore, conventionally, there has been a spacer of a type in which the reinforcing bar introduction groove is bent in a hook shape so that the spacer does not easily fall off the reinforcing bar (see Japanese Utility Model Laid-Open No. 1-1482). Further, there is a spacer of a type in which a steel wire embedded in a main body is protruded in the middle of a reinforcing bar introduction groove to prevent the reinforcing bar from coming off (see Japanese Utility Model Application Laid-Open No. 61-147808). Although these types are effective in preventing the steel bars from falling off from the reinforcing bars, the spacers cannot be prevented from moving in the longitudinal direction of the reinforcing bars, and as a result, the bending of the reinforcing bars during construction cannot be prevented.

An object of the present invention is to provide a reinforced concrete spacer which can reliably prevent bending of a reinforcing bar when a side wall of a reinforced concrete is constructed.

[0006]

In order to solve the above problems, a reinforced concrete spacer according to claim 1 of the present invention is provided between a formwork for casting and forming reinforced concrete and a reinforcing steel buried in the concrete. In the spacer for reinforced concrete, a plurality of which are arranged at predetermined intervals in the longitudinal direction of the reinforcing bar so as to regulate the spacing of A main body with a rebar introduction hole through which rebar placed in the center can be introduced from its outer periphery to the center, and a rebar introduced into the inner part of the rebar introduction hole of the main body and elastically introduced And a holding spring member.

In this case, the rebar can be held elastically by the spring member provided at the inner part of the rebar introduction hole, so that the spacers can be prevented from falling off from the rebar and, of course, each spacer moves in the longitudinal direction of the rebar. Can be prevented. Therefore, the spacing between the spacers can be maintained constant, so that bending of the reinforcing bar during construction can be reliably prevented. Further, as in claim 2, in claim 1, a holding recess for holding a spring member is formed in a deep portion of the rebar introduction hole, and the spring member is formed by bending a sheet steel material. Further, the spring member is fitted in the holding recess in an elastically deformed state, and is fixed to the inner surface of the holding recess by elastic repulsive force and fixed to the inner surface of the holding recess. It may have a pair of holding portions formed and elastically holding the reinforcing bars introduced between each other.

In this case, the same operation and effect as those of the first aspect of the invention can be obtained. In addition, since the spring member is formed by bending a sheet steel material, the spring member can be fixed to a molded product of the main body formed of concrete or the like by retrofitting, and the assembling property is good. Moreover, if the spring member is made of a sheet steel material, a sufficiently large contact area with the inner surface of the holding recess can be ensured. The fixing is secure and the spring member does not fall off the main body.

Further, since the spring member can be attached later to the molded product of the main body, the spring member of one or more specifications can be easily combined with the main body of one or more specifications. Through the standardization of products, flexible specification settings for products can be realized at low cost. According to a third aspect of the present invention, in the second aspect, the fixing portion has a channel shape having a pair of flanges at both ends of the web, and the inner surface of the holding recess is in contact with the web and the pair of flanges, respectively. The fixing portion is pulled out of the holding recess toward the outer peripheral side of the main body by including a web width, which is an interval between base ends of the pair of flanges, wider than an entrance width of the holding recess. It is preferable if the removal is regulated.

In this case, the same operation and effect as those of the second aspect of the invention can be obtained. Moreover, since the web and the flange, which are the surface elements of the channel-shaped fixing portion, are pressed against the positioning surfaces formed by the inner surfaces of the holding concave portions, the spring member is more securely fixed. Further, by making the web width wider than the entrance width of the holding recess, it is possible to reliably prevent the fixing portion from being pulled out from the holding recess toward the outer peripheral side of the main body, and the fall of the spring member is more reliably prevented. .

According to a fourth aspect of the present invention, in the first aspect, the spring member is formed by bending a wire steel material, and the spring member is embedded and fixed in a main body made of the molded body. It has a fixing portion, and a pair of holding portions formed in a bipedal shape continuous with the fixing portion and exposed into the reinforcing bar introduction groove, and elastically holding the reinforcing bars introduced between each other. It may be something.

In this case, the same operation and effect as the first aspect of the invention can be obtained. In addition, as a spring member, a generally inexpensive wire steel material formed by bending is used.
Manufacturing costs can be reduced. In addition, since this wire steel material can be easily insert-molded into a body formed of concrete or the like, and the spring member can be fixed simultaneously with the molding,
Hassle-free production. Moreover, since the spring member is embedded and fixed in the main body, there is no possibility that the spring member will fall off the main body.

According to a fifth aspect of the present invention, in the fourth aspect, the fixing portion includes a pair of first portions connected to the respective holding portions, and a pair of first portions connected to upper ends of the first portions and connected to the first portions.
And a second portion bent in a direction crossing a plane formed by the portion. In this case, the same operation and effect as those of the invention described in claim 4 can be obtained. In addition, since the fixing portion embedded and fixed in the main body made of a molded body has a three-dimensional structure having the first and second portions bent in a crossing manner with each other, it is easy to perform positioning when insert-molding this. In addition, the fixing strength after embedding becomes very strong. The crossing angle between the first portion and the second portion is most preferably a right angle for facilitating the positioning of the spring member during insert molding, but is not limited thereto. In the range of 60 to 120 °, more preferably 80 to 100
The angle may be in the range of °.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a front view of a reinforced concrete spacer as one embodiment of the present invention,
FIG. 2 is a schematic plan view showing the state of use of the spacers at the time of forming a side wall of reinforced concrete, for example. FIG.
FIG. 2 is an exploded perspective view of the spacer and a view showing an assembling process. In the following embodiment, description will be made on the case where the side wall of the reinforced concrete is constructed. However, the present spacer can be used in construction other than the side wall.

As shown in FIG. 2, a plurality of the reinforced concrete spacers 1 (hereinafter, simply referred to as spacers 1) are arranged at regular intervals S in the longitudinal direction of the reinforcing bar W, and the form F and the reinforcing bar W Is maintained.
Referring to FIGS. 1 and 3, the spacer 1 has a main body 2 made of a molded product such as concrete or mortar having a round plate shape such as a disk shape. This body 2 has
A reinforcing bar introduction hole 4 for introducing a reinforcing bar from the outer periphery 3 to the center is formed, and a spring member 5 for elastically holding the reinforcing bar is fixed to a deep portion of the reinforcing bar introducing hole 4. ing.

As shown in FIG. 4 which is a side view, the main body 2 has a shape in which one side is frusto-conical and the center is raised. Referring to FIGS. 1 and 3, a plurality of through holes 21 penetrating in the plate surface direction are formed in main body 2. These through-holes 21 are for allowing the concrete poured in at the time of construction to pass therethrough, relieving the pressure received by the spacer 1 from the poured concrete, and making the spacer 1 hard to shift in the longitudinal direction of the reinforcing bar W.

The above-described reinforcing bar introduction hole 4 has a first width having a constant width extending radially from the outer periphery 3 of the main body 2 toward the center.
Portion 41 and a second portion 42 which is continuous with the first portion 41 and has a larger width at the hole inner portion 4a which is the center of the main body 2.
And a holding recess 43 that extends further from the second portion 42 to the back with a narrow width. A spring member 5 for introducing a rebar and elastically holding it is fitted and fixed in the holding recess 43.

More specifically, the spring member 5 is formed by bending a plate steel material such as spring steel, and has a substantially U-shape as a whole. FIG. 5 is an enlarged front view of a main part of FIG. 1.
The spring member 5 includes a channel-shaped fixing portion 51 having a pair of flanges 53, 54 and a web 55 pressed and fixed to the inner surface of the holding recess 43, and a front end of the flange of the fixing portion 51. And a pair of holding portions 52, 52 which are formed in a continuous bipedal shape and elastically hold the reinforcing bar W introduced between each other.

Inner wall surfaces 44 and 45 as opposing positioning surfaces of the holding recess 43 are inclined in opposite directions to each other.
As a result, the distance between the inner wall surfaces 44 and 45 becomes narrower toward the entrance side of the holding recess 43. When fixing the spring member 5 to the holding recess 43, the flanges 53, 53 of the fixing portion 51 are pressed from the outside while the distance between the flanges 53, 53 is reduced, and the spring member 5 is laterally moved (in the axial direction of the body 2). ), And after the introduction, the external pressure on both flanges 53, 53 is released. Then, the two flanges 53, 53 expand in an attempt to return to the original state, and each flange 53, 53 is elastically pressed against the corresponding inner surface of the holding recess 43, and the fixing portion 51 is pressed against the holding recess 43 by this pressing force. Securely fixed.

On the other hand, the width d1 of the web 54 of the fixed portion 51
Is wider than the entrance width d2 of the holding recess 43,
The fixing portion 51 cannot be removed from the rebar introduction groove 4 to the outside in the radial direction of the main body 2 (indicated by a white arrow in the drawing). The fixing portion 51 cannot be introduced into the holding recess 43 of the reinforcing bar introduction groove 4 from the radial inside of the main body 2. As shown in FIG. 3, the fixing part 51 is introduced into the holding recess 43 from the axial direction of the main body 2. When no external force is applied to the flanges 53, 53, as shown by two-dot chain lines in FIG. 5, the flanges 53, 53 extend outward from each other. Are introduced while being bent so as to approach each other.

The pair of holding portions 52 of the fixed portion 51
The reinforcing members W are formed in a curved shape suitable for holding the reinforcing bar W having a round cross section (or a deformed cross section close to a round shape) therebetween, and the tip portions of the pair of holding portions 52 are disposed between the two. The guide portions 56 are formed so as to be outwardly extended from each other in order to facilitate the introduction of the reinforcing bar W into the inside. FIG. 6 is a longitudinal sectional view of a structure in which a side wall of reinforced concrete is formed using a formwork.
The spacer 1 is buried in the concrete C on the side wall. Reinforcing bar introduction hole 4 and through hole 21 of main body 2 of spacer 1
, Concrete enters and solidifies, and the spacer 1 and the concrete C are integrated.

According to this embodiment, since the reinforcing bar W can be elastically held by the spring member 5, the reinforcing bar W
As a result, each spacer 1 can be prevented from moving in the longitudinal direction of the reinforcing bar W, as a result, the spacing S between the spacers 1 and 1 can be kept constant, and the bending of the reinforcing bar W during construction can be reduced. It can be reliably prevented. In particular, since the spring member W is formed by bending a sheet steel material, the spring member 5 can be fixed after the molding of the main body 2 by retrofitting, and the assembling property is good.

Further, since the spring member 5 made of a steel plate material can secure a large contact area with the inner surface of the holding recess 43, the main body 2 can be provided despite good assemblability as described above.
Is securely fixed and does not fall off from the main body 2. In addition, since the spring member 5 can be fixed later, it is possible to easily and variously combine the spring member 5 with one or more specifications with the main body 2 with one or more specifications. Therefore, as a product of the spacer 1, flexible specification setting can be realized at low cost through standardization of parts.

Furthermore, since the fixing portion 51 has a channel shape and the web 54 and the flanges 53 are pressed against the positioning surfaces formed by the inner surfaces of the holding recesses 43, the spring member 5 is more fixed. It is certain. Further, by making the web width d1 wider than the entrance width d2 of the holding recess 43, it is possible to reliably restrict the spring member 5 from being pulled out radially outward of the main body 2.

Next, FIGS. 7, 8 and 9 show another embodiment of the present invention. Referring to the same figure, the present embodiment is different from the embodiment of FIG. 1 in that in the embodiment of FIG. 1, the spring member 5 made of a sheet steel material is fixed after the main body 2 is formed, In the present embodiment, the spring member 6 made of a wire steel is insert-molded and fixed to the main body 2.

For this reason, in this embodiment, the configuration of the holding recess 43 employed in the embodiment of FIG. 1 is abolished. 8 and 9 (a) and 9 (b),
The spring member 6 has substantially the same shape as the spring member 5 of the embodiment of FIG. 1 when viewed from the front, and includes a fixing portion 61 embedded and fixed in the main body 2 and a bipod continuous with the fixing portion 61. And a pair of holding portions 62 which are formed in a shape and are exposed in the reinforcing bar introduction groove 4 and elastically hold the reinforcing bars introduced between each other. The fixing portion 61 has a channel-like shape as a whole, and has a pair of first portions 61a continuous with the holding portions 62, and a first portion 61 continuous from the upper ends of the first portions 61a.
a, and a second portion 61b bent rearward at right angles. The second portion 61b may be bent so as to intersect with a plane (in this case, a vertical plane) formed by the pair of first portions 61a, but should be bent at a right angle as described above. However, this is most preferable in that the spring member can be easily positioned during insert molding. However, the intersection angle between the first portion 61a and the second portion 61b may be in the range of 60 to 120 °, preferably in the range of 80 to 100 °.

In the present embodiment, since the fixing portion 61 has a three-dimensional structure, positioning at the time of insert molding the fixing portion 61 is easy. Further, the fixing strength when the fixing portion 61 is buried becomes very strong. In the spring member 6 made of a wire steel material, the spring rigidity is weaker than that made of a sheet steel material.
The spacing between them has been reduced.

Further, in this embodiment, as in the embodiment shown in FIG. 1, the rebar W can be elastically held by the spring member 6, so that the spacers 1 can be dropped from the rebar W as well as each spacer 1 As a result of being able to prevent the rebar W from moving in the longitudinal direction, the spacing S between the spacers 1 and 1 can be kept constant, and the rebar W can be reliably prevented from being bent during construction.

In particular, since the spring member 6 is formed by bending a generally inexpensive wire rod, the manufacturing cost can be reduced. In addition, the wire steel material can be easily insert-molded into the main body 2 formed of concrete or the like, and the spring member can be fixed at the same time as the molding. Moreover, since the spring member 6 is embedded and fixed in the main body 2, there is no possibility that the spring member 6 will fall off the main body 2.

The present invention is not limited to the above embodiments. For example, in the embodiment shown in FIG.
Various modifications can be made within the scope of the present invention, such as making the fixing portion 51 of the spring member 5 round instead of channel-shaped.

[0031]

According to the first aspect of the present invention, since the rebar can be elastically held by the spring member, it is possible to prevent the spacers from dropping off the rebar and to prevent the spacers from moving in the longitudinal direction of the rebar. As a result, the spacing between the spacers can be kept constant, and the bending of the reinforcing bar during construction can be reliably prevented.

According to the second aspect of the invention, the same effect as the first aspect of the invention can be obtained. In particular, since the spring member used is formed by bending a sheet steel material, the spring member can be fixed by retrofitting after the main body is formed, and the assembling property is good. Moreover, since the spring member made of a sheet steel material can secure a large contact area with the inner surface of the holding recess, the spring member is securely fixed to the main body despite the good assemblability as described above, and falls off from the main body. Nothing to do. Also, since the spring member can be fixed by retrofitting, it becomes possible to easily combine one or more specifications of the spring member with one or more specifications of the main body.
Through standardization of parts, flexible specification setting of spacer products can be realized at low cost.

The third aspect of the invention has the same effect as the second aspect of the invention. In particular, since the fixing portion has a channel shape, the web and the flange, which are surface elements of the fixing portion, are pressed against the positioning surfaces formed by the inner surfaces of the holding recesses, respectively, so that the spring member is more securely fixed. . Further, by making the web width wider than the entrance width of the holding recess, it is possible to reliably prevent the fixing portion from being pulled out from the holding recess toward the outer peripheral side of the main body, and the fall of the spring member is more reliably prevented. .

According to the fourth aspect of the invention, the same effects as those of the first aspect of the invention can be obtained. In particular, since the spring member is formed by bending a generally inexpensive wire steel material, the manufacturing cost can be reduced. In addition, since this wire steel material can be easily insert-molded into a main body formed of concrete or the like, and the spring member can be fixed at the same time as the molding, there is no trouble in manufacturing. Moreover, since the spring member is embedded and fixed in the main body, there is no possibility that the spring member will fall off the main body.

According to the fifth aspect of the invention, the same effects as those of the fourth aspect of the invention can be obtained. In particular, since the fixing portion embedded and fixed in the main body has a three-dimensional structure having the first and second portions bent at right angles to each other, the positioning at the time of insert molding the same is facilitated. Thus, the fixing strength of the spring member after embedding becomes very strong.

[Brief description of the drawings]

FIG. 1 is a front view of a spacer according to an embodiment of the present invention.

FIG. 2 is a schematic plan view showing a use state of a spacer when constructing a side wall of reinforced concrete.

FIG. 3 is an exploded perspective view of the spacer and a view showing an assembling process.

FIG. 4 is a side view of a spacer.

FIG. 5 is an enlarged view of a main part of FIG. 1;

FIG. 6 is a longitudinal sectional view of a structure in which a side wall is constructed using a formwork.

FIG. 7 is a front view of a spacer according to another embodiment of the present invention.

FIG. 8 is a perspective view of a spring member.

FIGS. 9A and 9B are a front view and a side view of a spring member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spacer 2 Main body 3 Outer periphery 4 Rebar introduction groove 5 Spring member F Formwork D interval S interval 43 Holding concave part 44, 45 Inner wall surface (positioning surface) 51 Fixed part 52 Nipping part 53 Flange 54 Web d1 Web width d2 Inlet width 6 Spring Member 61 Fixed part 61a First part 61b Second part 62 Holding part C Concrete

Claims (5)

[Claims] 1. A plurality of reinforcing bars are arranged at predetermined intervals in the longitudinal direction of a reinforcing bar so as to regulate a space between a formwork for casting and forming reinforced concrete and a reinforcing bar embedded in the concrete. A reinforced concrete spacer, which is formed entirely of a substantially round plate-shaped molded body, and has a reinforcing bar introduction hole through which a reinforcing bar placed crosswise to the plate surface can be introduced from the outer periphery to a center portion; A reinforced concrete spacer comprising: a spring member fixed to a deep portion of a reinforcing bar introduction hole of a main body and elastically holding a reinforcing bar introduced into the deep hole. 2. A holding recess for holding a spring member is formed in a deep portion of the reinforcing bar introduction hole, and the spring member is formed by bending a sheet steel material. In a deformed state, the fixed portion is fitted into the holding concave portion and pressed and fixed to the inner surface of the holding concave portion by elastic repulsive force. The reinforced concrete spacer according to claim 1, further comprising a pair of holding portions for elastically holding the reinforcing bar. 3. The fixing portion has a channel shape having a pair of flanges at both ends of the web, and an inner surface of the holding recess includes a positioning surface that is in contact with and opposes the web and the pair of flanges, respectively. The width of the web, which is the distance between the base ends of the pair of flanges, is wider than the entrance width of the holding recess, so that the fixing portion is prevented from being pulled out of the holding recess toward the outer peripheral side of the main body. The reinforced concrete spacer according to claim 2, characterized in that: 4. The spring member is formed by bending a wire steel material, and the spring member has a fixed portion embedded and fixed in a main body made of the molded body, and a continuous portion connected to the fixed portion. 2. A reinforced concrete according to claim 1, comprising a pair of holding portions formed in a leg shape and exposed into the reinforcing bar introduction groove, and elastically holding the reinforcing bars introduced between each other. Spacer. 5. The fixing portion has a pair of first portions connected to each of the holding portions, and a direction continuous with an upper end of the first portions and intersecting a plane formed by the first portions. The spacer for reinforced concrete according to claim 4, further comprising a second portion bent at a right angle.