JP2000038807A - Reinforcement holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to surely indicate a thickness of cover concrete or a position of the upper surface of concrete even if concrete comes into contact with a level vial in the case concrete is placed. SOLUTION: A reinforcement holding device 70 bears reinforcing bars 72, 74, 76 and 78 by recess sections 12, 18, 32 and notches 22, 30 (bearing section) provided to a holding device main body 10. A level vial 40 capable of being mounted to the holding device main body 10 with a clip 68 indicates a required thickness of cover concrete of a position of the upper surface of concrete by elastic force of a spring 56 (elastic member). Even if concrete comes into contact with the level vial 40 in the case concrete is plated, the spring 56 is only flexible without bending or breaking the level vial. Then, in the case no pressure of concrete is applied to the spring, the spring is returned to an original state by its elastic force (arrows D8). Accordingly, the thickness of cover concrete or the position of the upper surface of concrete is surely indicated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holder for a reinforcing bar used in foundation works such as reinforced concrete works and skeleton works, and more particularly to a technique for surely indicating a cover thickness or a position of a concrete top.

[0002]

2. Description of the Related Art In a foundation work performed for building a building or pavement of a road, for example, in a reinforced concrete work, first, a reinforcing steel bar is assembled, and then concrete is poured. Assembling of the reinforcing bars is generally performed in the order of processes such as [Pasting concrete into foundation → Foundation base reinforcing → Column reinforcing → Connecting bar → Basic concrete driving → Column reinforcing → Wall reinforcing → Beam reinforcing → Floor reinforcing → Concrete driving) Done. Here, as the assembling of the rebar is carried out before and after the forming work, it is necessary to consider the relation and to prevent the rebar from moving due to vibration during concrete driving. Therefore, at the position where the two rebars intersect, the two rebars are bound by a smoothed iron wire. In addition, it is necessary to maintain linearity so that the rebar does not distort in the horizontal direction or bend in the vertical direction.

For this reason, in the prior art, for example, a Japanese Utility Model Laid-Open Publication No.
No. 201 uses a reinforcing bar holder (also called a "spacer"). According to the technique disclosed in the publication, as shown in FIG. 11, the reinforcing bar holder 200 includes a holder main body 206 and a level 202. The holder main body 206 is provided with a concave portion 204 and supports the reinforcing bar 208. The level 202 can be rotated (in the direction of arrow D22) to move in the vertical direction (in the direction of arrow D20) to adjust the cover thickness or the position of the concrete top.

[0004]

However, in concrete pouring, concrete is often transported to the site by a bucket, a pump, a chute or the like. When concrete is poured by this transportation, the concrete is level 2
In the case of 02, a part formed of plastic, metal, or the like is easily broken or bent by the pressure. If the level 202 breaks or bends, it will not accurately indicate the cover thickness or the position of the concrete top. Therefore, the operator does not know to what position (height) concrete should be driven.
The present invention has been made in view of such a point, even if the concrete hits during concrete driving,
An object of the present invention is to provide a reinforcing bar holder that can reliably indicate the cover thickness or the position of the concrete top.

[0005]

According to a first aspect of the present invention, there is provided a holder for a reinforcing bar according to the first aspect of the present invention, comprising: a supporting portion for supporting one or more reinforcing bars; And a level indicating the position of the top end.
According to the reinforcing bar holder according to the first aspect, the supporting portion supports one or more reinforcing bars, and the level indicates the cover thickness or the position of the concrete top. This level indicates the desired cover thickness or the position of the concrete top by the elastic force of the elastic member. Even if the concrete hits the level when the concrete is driven, it does not break or break, and only the elastic member bends. Thereafter, when the pressure of the concrete stops, the elastic member returns to the original state by the elastic force. Therefore, it is possible to reliably indicate the cover thickness or the position of the concrete top.

[0006]

According to a second aspect of the present invention, there is provided a reinforcing bar holder according to the second aspect, wherein the supporting portion has a plate-like member provided with irregularities. Formed. According to the reinforcing bar holder according to claim 2,
The support portion is formed of a plate-shaped member having irregularities. The unevenness can increase the rigidity of the plate-like member.
Therefore, it is possible to provide a reinforcing member for a reinforcing bar which is lightweight and has a low cost.

[0007]

According to a third aspect of the present invention, there is provided a reinforcing bar holder according to the third aspect, wherein the level of the reinforcing bar is attachable. I have. According to the reinforcing bar holder of the third aspect, the level can be attached. For this reason, the level can be attached to the necessary reinforcing bar holder.

[0008]

According to a fourth aspect of the present invention, there is provided a reinforcing bar holder according to the first, second, and third aspects, wherein the level is provided with a cover thickness. Alternatively, the position of the concrete top can be adjusted. According to the reinforcing bar holder according to the fourth aspect, the cover thickness or the position of the concrete top can be adjusted. Therefore, an appropriate cover thickness or the position of the top of the concrete can be indicated according to the foundation work such as the reinforced concrete work or the skeleton work.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Note that there are a plurality of types of reinforcing bars, such as slab bars and mesh bars, depending on the application. Therefore, Embodiment 1 shows an example corresponding to slab streaks, and Embodiment 2 shows an example corresponding to mesh streaks. Further, "cover thickness" and "position of the top of the concrete" are almost the same, and for the sake of simplicity, are described as "cover thickness" in the embodiment.

[Embodiment 1] First, Embodiment 1 is one in which the present invention is applied to a reinforcing bar holder for slab bars, and will be described with reference to FIGS. Here, FIG.
Shows a perspective view of the appearance of the reinforcing bar holder. In FIG.
The appearance of the level is shown in a perspective view. FIG. 3 shows the configuration of the level. FIG. 4 shows a process of attaching the level. FIG. 5 shows a reinforcing bar holder to which a level is attached. FIG.
Shows a state in which the reinforcing bar is supported. FIG. 7 shows a state in which the level is bent. In these figures,
The same elements are denoted by the same reference numerals.

The reinforcing bar holder for slab bars is constituted by a holder body and a level. First, the configuration of the holder main body will be described with reference to FIG. In FIG. 1, the holder main body 10 is formed by processing a metal plate such as pressing or molding, and has a height of about 50 to 500 mm according to the Building Standards Law. This holder main body 1
0 has three plate surfaces 16, substantially U-shaped when viewed from above.
24, 36, and the angle θ of the corner on the opening side exceeds 90 degrees. The reason for setting the angle θ as described above is that a plurality of holder main bodies 10 can be stacked on the opening side, so that carrying is simplified. Further, the angle θ makes it possible to stabilize the holder main body 10 and to reliably support the slab streaks. The structure may be another structure such as a K, L, V, W-shape or the like, which is approximately stable when the holder main body 10 is upright.
Here, a coating 20 is applied to a lower end portion of the holder main body 10 to improve appearance and prevent rust.
That is, the reinforcing bar holder for the slab muscle supports the slab muscle by being usually placed directly on the mold frame. Then, when the form is removed after the concrete has been driven in, the lower end of the reinforcing bar holder appears on the surface. If the coating 20 is not applied, the appearance deteriorates and rust is generated.

The plate surface 16 is provided with ribs 14 and concave portions 12 and 18. A rib 28 is provided on the plate surface 24, and notches 22 and 30 are provided at upper and lower ends. The plate surface 24 is provided with a mounting portion 38 for mounting a level 40 described later. The plate surface 36 has a plate surface 16
Similarly, the rib 34 and the concave portion 32 and the concave portion corresponding to the concave portion 18 are provided. Further, one or more concave portions 26 are provided on a ridge line formed by bending a single plate. The irregularities such as the ribs 14, 28, 34 are provided to increase the rigidity of each plate surface. The reason why the concave portion 26 is provided is to maintain the angle θ. These ribs 14, 28, 34 and recess 26
Accordingly, it is possible to provide a reinforcing bar holder that is lightweight and has a low cost.

Next, the structure of the level will be described with reference to FIGS. As shown in FIG.
Is composed of an adjusting portion 50 and a mounting piece 60.
The specific configuration of the adjusting portion 50 and the mounting piece 60 will be described with reference to FIG. Here, FIG.
FIG. 3A shows the adjusting section 50 in a front view, and FIG. 3B shows the structure of the mounting piece 60 in a three view.

The adjustment unit 50 shown in FIG.
And a spring 56. Head 54
And the pin 52 provided at the apex thereof are integrally formed of a predetermined material (for example, plastic, metal, rubber, or the like). A part of a spring 56 is wound around the lower end of the head 54 so as to withstand the pressure of the conveyed concrete. The spring 56 is made of metal, and is subjected to a low-temperature heat treatment in order to enhance the resilience of the spring. When the entire adjustment unit 50 is formed by an elastic member, the head 54 and the spring 56 may be formed integrally. Further, the adjusting portion 50 and the mounting piece 60 may be formed integrally.

The mounting piece 60 shown in FIG.
And a clip 68. The main body 64 is provided with a screw hole 62 that penetrates a portion that is bent so as to overlap with a gap. In the screw hole 62,
A cut 62b is provided from the end. This cut 6
The cutting piece 62a generated by 2b raises one piece slightly,
The other pieces are bent slightly so as to be lowered. Therefore, the spring 56 of the adjusting section 50 can be screwed into the screw hole 62 from above to below like a screw (in the direction of the arrow D2 in the drawing). The cover thickness can be appropriately adjusted by adjusting the screwing of the spring 56. The clip 68 is formed to extend from the main body 64, and includes end pieces (three end pieces in the figure) to be attached to the holder main body 10 by elastic force. The end portion of the end piece is formed so as to be spread so as to be easily sandwiched, and a stopper 66 is provided at a substantially central portion of the end piece (part or all). The stopper 66 is formed so as to withstand the pressure of the conveyed concrete. The level 40 can also be removed by removing the stopper 66 from the mounting hole 38b so as to press the stopper 66.

Here, it is more preferable that a part or the whole of the level 40 is colored with a color in which the cover thickness can be easily identified. The colors to be colored include colors such as yellow and orange, and fluorescent colors. Usually, the slab streaks are reddish brown and the concrete is gray. Therefore, the cover level can be easily identified by the colored level 40.

As shown in FIG. 4, the level 40 composed of the adjusting portion 50 and the mounting piece 60 sandwiches the clip 68 in the mounting hole 38a and the stopper 66 is hooked on the mounting hole 38b. To the holder main body 10. The clip 68 allows the level 40 to be attached to the holder body 10 in a short time and easily. Therefore, the mounting workability can be improved. In addition, the stopper 66 can reliably prevent the level 40 from being detached after being attached to the holder main body 10. FIG. 5 shows a reinforcing bar holder 70 in which the level 40 is attached to the holder main body 10 in this manner. Although the level 40 is configured to be attachable to the holder main body 10, the level 40 and the holder main body 10 may be formed integrally.

At a construction site such as a foundation construction such as a reinforced concrete construction or a skeleton construction, a reinforcing steel holder 7 is provided.
0 is used to support the slab muscle (rebar). In particular,
After the notch 30 is supported through the slab streaks 72, the slab streaks 74 are supported so as to bridge the recesses 12 and 32. After passing the slab streaks 76 through the notches 22, the slab streaks 78 are inserted into the not-shown concave portions and the concave portions 18 provided on the plate surface 36.
Support as a bridge. FIG. 6 shows a state in which four slab bars are supported by one reinforcing bar holder 70 in this manner. When the support of the slab streaks has been completed, concrete can be driven.

By the way, when concrete is poured, the concrete transported from the direction of arrow D6 may hit the level 40 as shown in FIG. However, also in this case, the spring 56 of the level 40 only bends and does not break or break under the pressure. Then, when the pressure of the concrete is stopped, the elastic force of the spring 56 causes the direction of arrow D8 (arrow D6).
(The direction opposite to the direction) and returns to the original position. Thus, since the level 40 returns to the original state as shown in FIG. 6, the cover thickness can be reliably indicated.

According to the first embodiment, the concave portions 12, 1
8, 32 and the notches 22, 30 (supporting portions) support one or more slab bars (rebars), and the level 40 indicates the cover thickness. In addition, the clip body 68 allows the holder body 1
The level 40, which can be attached to zero, indicates the desired cover thickness or the position of the concrete top by the elastic force of the spring 56 (elastic member). Then, even if the concrete hits the level 40 when the concrete is poured, the concrete does not break or break, and only the spring 56 bends. Thereafter, when the pressure of the concrete is stopped, the spring 56 returns to the original state by the elastic force.
Therefore, it is possible to reliably indicate the cover thickness or the position of the concrete top. Also, the ribs 14, 28, 34
In the plate-like member provided with the concave portions 26 (concavities and convexities),
8, 32 and notches 22, 30 (supporting portions) are formed. The unevenness can increase the rigidity of the plate-like member. Therefore, it is possible to provide a reinforcing member for a reinforcing bar which is lightweight and has a low cost.

Further, the level 40 can be attached or detached by a clip 68. Therefore, the level 40 can be attached to the necessary reinforcing bar holder 70, and furthermore, it can be removed and reused. The cover thickness can be adjusted by adjusting the level of screwing the spring 56 in the level 40 into the screw hole 62. Therefore, an appropriate cover thickness can be shown in accordance with foundation work such as reinforced concrete work or frame work.

[Embodiment 2] Next, Embodiment 2 is one in which the present invention is applied to a reinforcing bar holder for mesh bars, and will be described with reference to FIGS. here,
FIG. 8 is a perspective view showing the appearance of another holder for reinforcing bars. FIG. 9 shows a reinforcing bar holder to which a level is attached. FIG.
0 indicates a state where the reinforcing bar is supported. In these figures, the same elements as those shown in FIGS. 1 to 7 are denoted by the same reference numerals. Also, the same level as that in the first embodiment is used as the level 40.

The reinforcing bar holder for the mesh bars is composed of a holder body and a level 40. First, the configuration of the holder main body will be described with reference to FIG. The holder main body 100 shown in FIG. 8 is formed in a substantially square cylindrical shape by a processing method such as press working or molding, similar to the holder main body 10. The holder body 100
Is lower than the holder main body 10. Through holes 106, 108, 110 and 112 are provided on each surface, respectively.
Recesses 102, 104, 114,
116 are provided respectively. Also, on one side,
An attachment portion 118 for attaching the level 40 is provided. When the clip 68 of the level 40 is clamped in the mounting hole 118a and the stopper 66 is mounted on the holder main body 100 so that the stopper 66 is hooked on the mounting hole 118b, the state shown in FIG. In this manner, a reinforcing bar holder 130 in which the level 40 is attached to the holder main body 100 is obtained. The above clip 6
8, the level 40 can be attached to the holder main body 100 in a short time and easily. for that reason,
Installation workability can be improved. Further, the stopper 66 can reliably prevent the level 40 from being detached after being attached to the holder main body 100.

At a construction site such as a foundation construction such as a reinforced concrete construction or a skeleton construction, a reinforcing steel holder 1
30 is used to support a mesh bar (rebar). Specifically, the mesh streaks 120 are supported by bridging the concave portions 102 and 114. Alternatively, the mesh streaks 122 are supported so as to bridge the recesses 104 and 116. FIG. 10 shows a state in which the mesh bar 120 is supported by the reinforcing bar holder 130 in this manner. The through holes 106, 108, 110, and 112 are provided to make it easier for concrete to enter the inside of the square tube. Once the mesh bars have been supported, concrete can be driven. When concrete is driven, the level 40 is the same as that in the first embodiment. That is, the spring 56 bends when the conveyed concrete hits the level 40, but returns to its original state due to the elastic force of the spring 56 when the concrete is no longer subjected to pressure. Therefore, the level 40 can reliably indicate the cover thickness by the elastic force of the spring 56. Therefore, also in the second embodiment, the same effect as in the first embodiment can be obtained.

[Other Embodiments] In the above-described rebar holder, the structure, shape, size, material, number, arrangement, operating conditions, and the like of other portions are limited to those in the above-described embodiment. Not. For example, each of the following embodiments to which the above embodiment is applied may be implemented. (1) In each of the above embodiments, the spring 56 is used as the elastic member. Instead of this form, another elastic member may be used. As another elastic member, another elastic member having an elastic force, such as rubber, a leaf spring, or steel, can be used. Even in this case, the level is returned by the elastic force of the other elastic member, and the level 40 indicates the cover thickness or the position of the concrete top, so that the cover thickness or the position of the concrete top is surely ensured. Can be shown.

(2) Similarly, instead of using the spring 56 as an elastic member, the elastic member may be formed of a shape memory alloy having a superelastic function. Here, as the shape memory alloy, for example, Ni-Ti alloy or Ni-Ti-Co
Use an alloy. When a shape memory alloy is used, even if the shape memory alloy is used, it immediately returns to the stored original shape. Shape memory alloy hardly changes its material due to aging,
In addition, it has corrosion resistance and does not rust with water or salt water. Therefore, it is possible to more reliably indicate the cover thickness or the position of the concrete top. In addition, as the material of the shape memory alloy, another alloy containing Ni, another alloy containing Ti, another alloy containing Co, or the like may be used. Furthermore, Cu
A shape memory alloy having a superelastic function, such as an alloy containing Cd, an alloy containing Cd, an alloy containing In, an alloy containing Al, an alloy containing Fe, or an alloy containing Pd may be used. Specifically, beta-alloy (Cu-Zn-Al), Ag-Cd alloy, Au-Cd alloy, Cu
-Al-Ni alloy, Cu-Au-Zn alloy, Cu-Sn alloy, Cu-Zn alloy, Cu
-Zn-X (X = Si, Sn, Ga) alloy, In-Tl alloy, Ni-Al alloy, Fe-Pt
Alloy, Fe-Pd alloy, Mu-Cu alloy, Fe-Ni-Co-Ti alloy and the like.

(3) The material of the plate-like member forming the holding portions (recesses 12, 18 and recesses 102, 104, etc.) of the reinforcing bars 70, 130 is not limited to metal, but may be plastic (thermoplastic, thermosetting). Plastics, including fiber reinforced plastics (FRP), ceramics (including fine ceramics), metal-based composite materials [FRM],
It is also possible to form with other materials such as a shape memory alloy. When formed using such a material, it is possible to reduce the weight and cost particularly in the case of plastics, and in the case of a metal matrix composite material [FRM] or a shape memory alloy, etc., durability and corrosion resistance It is possible to prevent concrete destruction because of its excellent properties.

[0028]

As described above, the embodiments of the present invention have been described. This embodiment has not only the aspects of the invention described in the claims but also other aspects of the invention. Embodiments of the present invention will be enumerated below, and related explanations will be provided as necessary.

[Aspect 1] In the reinforcing bar holder according to the first, second, third and fourth aspects, a part or all of the level is formed of a shape memory alloy having a superelastic function. Utensils. [Relevant Description of Aspect 1] According to this aspect, even if the super-elastic function is performed, the shape immediately returns to the stored shape. Shape memory alloy hardly changes its material due to aging,
In addition, it has corrosion resistance and does not rust with water or salt water. Therefore, it is possible to more reliably indicate the cover thickness or the position of the concrete top.

[Embodiment 2] In the holder for reinforcing bars according to claim 1, 2, 3, 4 or 2, the cover level or the position of the top of the concrete can be easily provided on a part or all of the level. Reinforcing bar holder colored with a color that can be identified. [Relevant Description of Aspect 2] According to this aspect, the fogging thickness can be easily identified by the colored level.

[0031]

According to the present invention, the cover thickness or the position of the concrete top can be reliably indicated.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an appearance of a reinforcing bar holder.

FIG. 2 is a perspective view showing an appearance of a level.

FIG. 3 is a diagram showing a configuration of a level.

FIG. 4 is a diagram showing a process of attaching a level.

FIG. 5 is a view showing a state where a level is attached.

FIG. 6 is a diagram showing a state in which a reinforcing bar is supported.

FIG. 7 is a diagram showing a state in which a level is bent.

FIG. 8 is a perspective view showing the appearance of another holding tool for reinforcing bars.

FIG. 9 is a view showing a state where a level is attached.

FIG. 10 is a diagram showing a state where a reinforcing bar is supported.

FIG. 11 is a view showing a conventional holder.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Holder main body 12,18,32 Concave part (support part) 14,28,34 Rib (irregularity) 22,30 Notch 38 Mounting part 40 Level level 50 Adjusting part 56 Spring (elastic member) 60 Mounting piece 66 Stopper 68 Clip 70 Reinforcing bar holder 72, 74, 76, 78 Slab bar (rebar)

Claims (4)

[Claims] 1. A rebar holder having a support portion for supporting one or more rebars, and a level indicating a cover thickness or a position of a concrete top by an elastic force of an elastic member. 2. The reinforcing bar holder according to claim 1, wherein the support portion is formed of a plate-shaped member having irregularities. 3. The reinforcing bar holder according to claim 1, wherein the level is attachable. 4. The reinforcing bar holder according to claim 1, wherein the level of the reinforcing bar or the position of the concrete top is adjustable.