JP6875219B2 - Reinforcing bar support structure using spacers for reinforcement and spacers for reinforcement - Google Patents

Description

According to the present invention, when concrete is cast on a deck plate having a structure in which peaks and valleys are alternately connected via an inclined portion and bent into a substantially trapezoidal corrugated cross section to construct a concrete slab, the valley is constructed. It belongs to the technical field of a spacer for reinforcing bars used for arranging reinforcing bars in a section.

The technique of arranging reinforcing bars (for example, fireproof reinforcing bars of D13) in the valleys of the deck plate having the above-described configuration is typified by the following two types.
(1) A construction method in which a single member such as a concrete dice is placed on the upper surface of the valley of the deck plate, and a reinforcing bar is installed and supported on the single member (hereinafter referred to as a single construction method).
(2) For example, as shown in FIG. 11 of the present application and Patent Documents 1 and 2, one bar material (wire material) having a groove formed in a portion corresponding to a valley portion of the deck plate is placed in the width direction of the deck plate. A method of arranging in the twist direction) and installing reinforcing bars in the groove to support it (hereinafter referred to as the bar method).

Jikkai Sho 58-156815 Design Registration No. 661736 Gazette

In the case of the single construction method (1), for example, if it is to be carried out in a large store or warehouse having a large floor area of about 30,000 square meters, about 3000 single members are actually required. Therefore, in addition to the high cost, it takes time and effort (labor) to arrange the product at a predetermined position, resulting in poor economic efficiency and workability.

In the case of the bar construction method (2), since one bar material can support a plurality of reinforcing bars, the number of used bars (number of bars used) can be reduced as compared with the single member, and the workability, economy, and load are not bulky. Excellent in handleability.
However, when the bar material a is free at both ends of FIG. 11 described above, the movement (sliding movement) of the deck plate b in the width direction cannot be restrained, and thus the positioning becomes unstable, so that the adjustment work is performed. There were problems to be improved in terms of workability and certainty, such as the fact that the positioning adjustment by the operator's sense was liable to vary.
Further, when the bar material provided with the hooking portions at both ends of Patent Documents 1 and 2 is used, the slipping movement can be restrained, but due to an error (cumulative error) due to the addition of a plurality of deck plates in the width direction. However, a new problem has arisen, such as a situation in which one of the hooks is fitted but the other is not fitted.

The present invention has been devised in view of the above-mentioned problems of the background technology, and an object of the present invention is to adopt a bar construction method which is superior in workability, economy, and cargo handling to the above-mentioned single construction method. Furthermore, the movement of the deck plate in the width direction can be restrained to eliminate the positioning adjustment work, and even if an error occurs due to the addition of the deck plate in the width direction, the work can be performed without any problem. It is an object of the present invention to provide a reinforcing bar spacer and a reinforcing bar support structure using the reinforcing bar spacer, which are extremely excellent in workability and reliability.

As a means for solving the above problems, the reinforcing bar spacer according to the invention according to claim 1 is formed by bending a substantially trapezoidal corrugated cross section in which peaks and valleys are alternately connected via inclined portions. It is a spacer for reinforcing bars used for arranging reinforcing bars in the valley when concrete is cast on the deck plate of the structure to construct a concrete slab.
With one wire rod, a flat portion resting on the upper surface of the mountain portion and a substantially V-shaped groove portion for arranging reinforcing bars in the valley portion are alternately bent and formed, and one end portion of the one wire rod. However, it is characterized in that it is bent and formed along the mountain portion and the upper portions of the inclined portions connected to both sides thereof, and the other end portion is formed in a free state.

According to the second aspect of the present invention, in the reinforcement spacer according to the first aspect, the deck plate is further formed on the inclined portions on both sides of the mountain portion from the slope portion and the jaw portion which are continuously provided with the mountain portion. When the configuration is provided with a hook-shaped step portion,
One end of the one wire rod is bent and formed along the mountain portion and the slope portions of the hook-shaped step portions on both sides thereof.

According to the third aspect of the present invention, in the reinforcing bar arrangement spacer according to the second aspect, the tip of one end of the one wire rod is bent into a hook portion that can be hooked to the jaw portion of the hook-shaped step portion. It is characterized in that it is formed.

The invention according to claim 4 is characterized in that, in the spacer for bar arrangement according to any one of claims 1 to 3, the other end of the one wire rod is formed on the flat portion. And.

In the invention according to claim 5, in the spacer for bar arrangement according to any one of claims 1 to 4, the number of flat portions is four and the number of substantially V-shaped groove portions is three. It is characterized in that the number of the flat portions is three and the number of the substantially V-shaped groove portions is bent to two.

In the reinforcing bar support structure using the reinforcing bar spacer according to the invention according to claim 6, the reinforcing bar supporting spacer according to any one of claims 1 to 5 is laid in the width direction of the deck plate. Being continuously arranged in a partially wrapped state,
A reinforcing bar directed in the span direction of the deck plate is supported at the bottom of a substantially V-shaped groove portion of the reinforcing bar-arranging spacer.

According to the reinforcing bar support structure using the bar arrangement spacer and the bar arrangement spacer according to the present invention, since it is carried out by the bar construction method, it is superior in workability, economy, and load handlingability as compared with the single construction method. In addition, one end of the reinforcing bar spacer is fastened to the mountain part of the deck plate, while the other end is not fastened to the deck plate in a free state, so the movement of the deck plate in the width direction is restricted. Therefore, the positioning adjustment work can be eliminated, and even if an error (cumulative error) occurs due to the addition of the deck plate in the width direction, the work can be performed without any problem. Therefore, it is possible to realize a reinforcing bar support structure using a reinforcing bar spacer and a reinforcing bar spacer that are extremely excellent in workability and reliability, and by extension, a high-quality concrete slab can be constructed.

It is a front view which showed the reinforcing bar support structure using the spacer for bar arrangement which concerns on Example 1. FIG. It is a front view which showed the spacer for bar arrangement which concerns on Example 1. FIG. It is a perspective view which showed the arrangement state of the spacer for bar arrangement which concerns on Example 1. FIG. It is a front view which showed the reinforcing bar support structure using the spacer for bar arrangement which concerns on Example 2. FIG. It is a front view which showed the spacer for bar arrangement which concerns on Example 2. FIG. It is a perspective view which showed the arrangement state of the spacer for bar arrangement which concerns on Example 2. FIG. It is a front view which showed the reinforcing bar support structure using the spacer for bar arrangement which concerns on Example 3. FIG. It is a front view which showed the spacer for bar arrangement which concerns on Example 3. FIG. It is a perspective view which showed the arrangement state of the spacer for bar arrangement which concerns on Example 3. FIG. A and B are front views showing variations of the bar arrangement spacers. A is a front view showing a reinforcing bar support structure using a reinforcement spacer according to a conventional example, and B is a front view showing the same reinforcement spacer.

Next, an example of the reinforcing bar supporting spacer and the reinforcing bar supporting structure using the reinforcing bar reinforcing spacer according to the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 3, the reinforcing bar spacer 1 according to the present invention has a deck having a structure in which peaks and valleys are alternately connected via inclined portions and bent into a substantially trapezoidal corrugated cross section. This is a reinforcing bar-arranging spacer 1 used for arranging reinforcing bars 11 (for example, fire-resistant reinforcing bars) in the valley portion when concrete is cast on the plate 10 to construct a concrete slab.
The reinforcing bar spacer 1 is an abbreviation for arranging the flat portion 2 placed on the upper surface of the mountain portion and the reinforcing bar 11 in the valley portion by one wire rod (for example, a mild steel wire rod having a diameter of about 4 to 5 mm). V-shaped groove portions (concave groove portions) 3 are alternately bent and formed, and one end portion 1a of the one wire rod is bent along the mountain portion and the upper portion of the inclined portion connected to both sides thereof. It is formed, and the other end 1b is formed in a free state.
In the present specification, the "free state" refers to a state in which the deck plate is not formed so as to be hookable.

Specifically, the reinforcement spacer 1 has a flat portion 2 having the same length as or slightly longer than the mountain portion, and a substantially V-shaped groove portion 3 for arranging the reinforcing bars 11 in the valley portion in the form of the deck plate 10. One end portion 1a is bent and formed so as to sandwich (hold) the mountain portion of the corresponding deck plate 10, and the other end portion 1b is formed on the flat portion 2. It is implemented in the configuration. The substantially V-shaped groove portion 3 is bent in a V shape with a structural design capable of hollowly supporting the reinforcing bar 11 at a predetermined height (for example, about 45 mm from the valley portion).

When the bar arrangement spacer 1 having the above configuration is arranged on the mountain portion of the deck plate 10, one end portion 1a thereof is fastened to the mountain portion of the corresponding deck plate 10, and the flat portion 2 of the other end portion 1b is attached. It is simply placed on the upper surface of the mountain portion of the corresponding deck plate 10.
Then, in the bar arrangement spacer 1, even if the other end 1b is in the free state, the one end 1a is hooked so as to sandwich the mountain portion of the deck plate 10, so that the width direction (twisting direction) of the deck plate 10 is obtained. ) Does not slide even if an external force acts on it, so that the positioning adjustment work in the width direction of the deck plate 10 can be eliminated.
Further, since the other end 1b of the bar arrangement spacer 1 is implemented in a free state in which the flat portion 2 is simply placed on the mountain portion, an error (cumulative error) due to the addition of the deck plate 10 in the width direction is performed. It can be placed smoothly on the mountain without being affected by the error.

By the way, the dimensions of the deck plate 10 according to FIG. 1 are such that the width is about 700 mm (three-mountain type), the height (mountain height) is about 75 mm, the width of the flat part of the mountain part is about 112 mm, and the flat part of the valley part. The width dimension is about 88 mm, the plate thickness is about 1.0 to 1.6 mm, and the total length (span length) is about 1.8 to 3.6 m.
Of course, the form (shape, dimensions) of the deck plate 10 is not limited to this, and the design is appropriately changed according to the structural design such as the installation interval of the beam material and the structurally required strength. In other words, the form of the deck plate 10 to which the reinforcing bar spacer 1 according to the present invention can be applied can be applied to any form as long as it is bent and formed on the substantially trapezoidal corrugated cross section described above. ..
For example, in recent years, there has been an increasing demand for the deck plate 10 having a synthetic mechanism such as embossing, a key groove, or a hook-shaped step portion in order to improve the fixing property with the cast concrete. The bar arrangement spacer 1 can also be applied to a deck plate to which the synthesis mechanism has been applied (see, for example, FIGS. 4, 7, and 10 described later), and a deck plate to which the synthesis mechanism has not been applied (for example, see FIG. 10). It can also be applied to (see FIGS. 1 and 11).

Thus, in the reinforcing bar support structure using the reinforcing bar spacer 1 having the above configuration, the reinforcing bar spacer 1 is provided in the width direction of the deck plate 10 laid in large numbers between the beams in a predetermined region (omitted for convenience of illustration). As shown in FIG. 3, the substantially V-shaped groove portion 3 for arranging the reinforcing bars 11 is continuously arranged in a partially wrapped state so as not to be interrupted.
Then, the reinforcing bars 11 directed in the span direction of the deck plate 10 are supported by the bottoms of the substantially V-shaped groove portions 3 of the plurality of reinforcing bar-arranging spacers 1 arranged in the predetermined region.

Since the reinforcing bar-arranging spacer 1 can be automatically positioned only by hooking one end portion 1a to the mountain portion of the corresponding deck plate 10, simple and good arrangement work can be performed. Incidentally, although not shown, the reinforcement spacer 1 is arranged substantially parallel to the span direction of the deck plate 10 at a pitch of, for example, about 0.5 to 1.0 m.
Further, since the reinforcing bar spacer 1 is automatically positioned only by hooking it on the mountain portion of the deck plate 10, a plurality of reinforcing bar reinforcing spacers 1 are arranged in the span direction to commonly support the reinforcing bars 11. 1 (substantially V-shaped groove portion 3) coincides so as to overlap when viewed along the span direction. Therefore, it is possible to reliably perform the reinforcing bar arrangement work of the reinforcing bar 11 with high accuracy.

After constructing the reinforcing bar support structure having the above structure, the reinforcing bar 11 and the reinforcing bar spacer 1 are appropriately bound with a binding material such as an iron wire, and a welded wire net is used on a portion having a cover thickness of about 30 mm from the upper surface of the concrete. A crack expansion prevention bar such as a diameter reinforcing bar is arranged, and then concrete is cast to construct a concrete slab.

4 to 6 show different examples of the reinforcing bar support structure using the reinforcing bar spacer 21 and the reinforcing bar spacer 21.
The reinforcement spacer 21 according to the second embodiment has three to four flat portions and two substantially V-shaped groove portions as compared with the reinforcement spacer 1 according to the first embodiment. The point that it was expanded to three and the length was formed to be longer by that amount, and the point that the design was slightly changed due to the change from the deck plate 10 without the synthesis mechanism to the deck plate 20 with the synthesis mechanism. Although different, the concept is the same as in Example 1.
That is, the reinforcing bar spacer 21 according to the second embodiment has a flat portion 22 mounted on the upper surface of the mountain portion of the deck plate 20 and a reinforcing bar 11 in the valley portion by a single wire rod, as in the first embodiment. The substantially V-shaped groove portions 23 for arranging the reinforcing bars are alternately bent and formed, and one end portion 21a of the one wire rod is formed on the mountain portion and the upper portion of the inclined portion continuously provided on both sides thereof. It is bent and formed along the slope portion 20a of the hook-shaped step portion 20a composed of the slope portion and the jaw portion, and the other end portion 21b is formed in a free state (flat portion 22).

By the way, FIG. 4 exemplifies the addition of two deck plates 20 of the same type, and the dimensions of each deck plate 20 are about 600 mm in width (two-mountain type) and about 92 mm in height (mountain height). The width of the flat part of the mountain part is about 142 mm, the width of the flat part of the valley part is about 100 mm, the plate thickness is about 1.0 to 1.6 mm, and the total length (span length) is about 1.8 to 3.6 m. It is carried out in.

When the bar arrangement spacer 21 according to the second embodiment is arranged on the mountain portion of the deck plate 20, the procedure is the same as that of the first embodiment. That is, one end 21a of the bar arrangement spacer 21 is fastened to the mountain portion of the corresponding deck plate 20, and the flat portion 22 of the other end 21b is simply placed on the upper surface of the mountain portion of the corresponding deck plate 20.
Then, in the bar arrangement spacer 21, even if the other end 21b is in the free state, the one end 21a is hooked so as to sandwich the mountain portion of the deck plate 20, so that an external force is applied in the width direction of the deck plate 20. Even if it acts, it does not slide, so that the positioning adjustment work in the width direction of the deck plate 20 can be eliminated.
Further, since the other end 21b of the bar arrangement spacer 21 is implemented in a free state in which the flat portion 22 is simply placed on the mountain portion, an error (cumulative error) due to the addition of the deck plate 20 in the width direction is performed. It can be placed smoothly on the mountain without being affected by the error.

The reinforcing bar support structure using the reinforcing bar spacer 21 having the above configuration is the same as that in the first embodiment. That is, in the width direction of the deck plate 20 laid in large numbers between the beams in the predetermined region, the reinforcing bar spacer 21 has a substantially V-shaped groove portion 23 for arranging the reinforcing bar 11 as shown in FIG. It is continuously arranged in a partially wrapped state so as not to be interrupted.
Then, the reinforcing bars 11 directed in the span direction of the deck plate 20 are supported on the bottom of the substantially V-shaped groove portions 23 of the plurality of reinforcing bar-arranging spacers 21 arranged in the predetermined region.

Since the reinforcing bar-arranging spacer 21 can be automatically positioned only by hooking one end portion 21a to the mountain portion of the corresponding deck plate 20, simple and good arrangement work can be performed.
Further, since the reinforcing bar spacer 21 is automatically positioned only by hooking it on the mountain portion of the deck plate 20, a plurality of reinforcing bar reinforcing spacers arranged in the span direction that commonly support the reinforcing bar 11 are arranged. 21 (substantially V-shaped groove portion 23) coincide with each other so as to overlap when viewed along the span direction. Therefore, it is possible to reliably perform the reinforcing bar arrangement work of the reinforcing bar 11 with high accuracy.

After constructing the reinforcing bar support structure having the above structure, the reinforcing bar 11 and the reinforcing bar spacer 21 are appropriately bound with a binding material such as an iron wire, and a welded wire net is used on a portion having a cover thickness of about 30 mm from the upper surface of the concrete. A crack expansion prevention bar such as a diameter reinforcing bar is arranged, and then concrete is cast to construct a concrete slab.

As shown in FIGS. 7 to 9, the tip of one end 21a of the bar arrangement spacer 21 is bent (extended) into a hook portion 4 that can be hooked to the jaw portion of the hook-shaped step portion 20a. ) When the reinforcement spacer 21'is used, one end of the reinforcement spacer 21'can be more reliably hooked to the corresponding mountain portion of the deck plate 20, so that the reinforcement spacer 21' It is possible to further improve the certainty and reliability of the arrangement work.

Although the examples have been described above with reference to the drawings, the present invention is not limited to the illustrated examples, and includes a range of design changes and application variations normally performed by those skilled in the art within a range that does not deviate from the technical idea thereof. Is mentioned just in case.
For example, the bar arrangement spacer according to the present invention is not limited to the bar arrangement spacers 1, 21, 21'according to the above Examples 1 to 3, and is like the bar arrangement spacer 31, 31'exemplified in FIG. The design can be freely changed according to the form of the deck plates 30 and 30'to be laid. Incidentally, the reinforcement spacers 31 and 31'according to FIG. 10 are carried out by a method of hooking one end portions 31a and 31a'to the left mountain portion of the deck plate 30, contrary to the above-described first to third embodiments. doing.

1 Reinforcing spacer 1a One end 1b Other end 2 Flat part 3 Approximately V-shaped groove 4 Hooking part 10 Deck plate 11 Reinforcing bar 20 Deck plate 20a Hook-shaped step 21'Reinforcing spacer 21a One end 21b Other end 22 Flat part 23 Approximately V-shaped groove 30 Deck plate 30' Deck plate 30a Hook-shaped step portion 31 Reinforcing spacer 31' One end 31a One end 31a'One end 31b'The other end Part 32 Flat part 33 Approximately V-shaped groove part

Claims (6)

When concrete is placed on a deck plate having a structure in which peaks and valleys are alternately connected via an inclined portion and bent into a substantially trapezoidal corrugated cross section to construct a concrete slab, reinforcing bars are provided in the valleys. A spacer for reinforcing bars used for reinforcing bars.
With one wire rod, a flat portion resting on the upper surface of the mountain portion and a substantially V-shaped groove portion for arranging reinforcing bars in the valley portion are alternately bent and formed, and one end portion of the one wire rod. However, the spacer for reinforcing bars is characterized in that the mountain portion and the upper portions of the inclined portions connected to both sides thereof are bent and formed, and the other end portion is formed in a free state. When the deck plate is further provided with hook-shaped step portions including a slope portion and a jaw portion that are continuously provided with the mountain portion on the inclined portions on both sides of the mountain portion.
The spacer for bar arrangement according to claim 1, wherein one end of the one wire rod is bent and formed along the mountain portion and the slope portions of the hook-shaped step portions on both sides thereof. .. The spacer for bar arrangement according to claim 2, wherein the tip of one end of the one wire rod is bent and formed on a hook portion that can be hooked to the jaw portion of the hook-shaped step portion. The spacer for bar arrangement according to any one of claims 1 to 3, wherein the other end of the one wire rod is formed on the flat portion. The number of flat portions is four and the number of substantially V-shaped grooves is bent to three, or the number of flat portions is three and the number of substantially V-shaped grooves is bent to two. The spacer for bar arrangement according to any one of claims 1 to 4, wherein the spacer is provided. The reinforcement spacer according to any one of claims 1 to 5 is continuously arranged in a state of being partially wrapped in the width direction of the laid deck plate.
A reinforcing bar support structure using a reinforcing bar spacer, characterized in that a reinforcing bar directed in the span direction of the deck plate is supported at the bottom of a substantially V-shaped groove portion of the reinforcing bar spacer.

Images