JPH04149347A - Spacer for deck plate - Google Patents

Abstract

PURPOSE:To ensure a desired cover and to prevent the outer surface of a concrete board from cracking by suspending a plurality of leg members for setting a height, from a support rod which supports reinforcement, and by forming concrete receivers in the lower end parts of the leg members. CONSTITUTION:A plurality of leg members 21 for setting a height is suspended from a support rod 20 for supporting a reinforcing member so as to form a spacer 22 for a deck plate. Further, a concrete receiver 21a which has a semicircular shape, or which has a totally U-like but a semicircular in its lower part is provided to the lower part of each of the leg members 21. Further, a single rod member is formed into a continuous spiral shape so as to form a plurality of substantially U-like leg parts 21.

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is used to set the "Kafuri A" of a reinforcing bar member buried in the concrete plate thickness when forming a concrete slab using a deck plate. This relates to a deck plate spacer.

<Prior art> As a conventional deck plate spacer, for example, the fourth
The devices shown in FIGS. 6 to 6 are known.

In the concrete slab 2 using the deck plate 1, a predetermined Welded wire mesh 3, etc. as reinforcing steel members are buried in positions to ensure "cover". Therefore, this welded wire mesh 3 etc. is normally installed between the top surface of the deck plate l and the surface of the concrete slab 2, and must be placed in a predetermined position floating in space before concrete is poured. (See Figure 5).

For this reason, the welded wire mesh 3 and the like are arranged using spacers 4 as shown in FIG. This spacer 4 is composed of a support rod 5 on which the welded wire mesh 3 and the like are placed and supported, and a plurality of legs 6 for height setting that are connected in an inclined manner downward from the support rod 5. . That is, this spacer 4
The distance from the surface of the concrete slab 2 to the welded wire mesh 3, etc. is determined by placing it on the valley 1a of the deck plate 1 and setting the height from the top surface of the valley 1a to the installation position of the welded wire mesh 3, etc. Ensure so-called "cover".

Spacers 4 are placed closely in areas where people walk or work on the welded wire mesh 3 to ensure sufficient strength.
This is to prevent deformation of the welded wire mesh 3 and the like. Also,
In other parts, spacers 4 are arranged at predetermined intervals.

<Problems to be Solved by the Invention> However, in such a conventional deck plate spacer 4, since the legs 6 are connected by the horizontally arranged support rods 5, it is difficult to support them during concrete pouring. A push-up blade acts on the rod 5. That is, as the concrete is poured, the upper surface of the concrete gradually rises and when it reaches the position of the support rod 5, the upper surface of the concrete acts as a push-up blade that tries to push the support rod 5 upward. However, since there is no force against this push-up blade to keep the spacer 4 on the deck plate, the spacer 4 itself lifts up, making it impossible to secure the predetermined "cover A" and causing the concrete plate 2 There was a risk of cracking on the surface.

This invention has been made by focusing on the above-mentioned conventional examples, and provides a deck that can prevent cracks on the surface of concrete slabs by ensuring a predetermined "cover height" without lifting up during concrete pouring. This invention provides a spacer for plates.

<Means for Solving the Problems> In order to achieve the above object, the deck plate spacer according to the present invention is a deck plate spacer in which a plurality of height setting legs are suspended from a support rod that supports a reinforcing steel member. This is a plate spacer in which a concrete receiving part is provided at the lower part of the leg.

<Function> The deck plate spacer according to the present invention has a concrete receiving part at the bottom of the leg body, so when concrete is poured, the concrete itself presses the concrete receiving part downward due to its weight, and the support rod When concrete is placed to a height of , it is possible to prevent the spacer from lifting up against the push-up blade acting on the support rod.

And, since the concrete receiving part was made into a roughly semicircular shape,
When the spacer is installed, it will be supported at one point on the bottom edge, so it will sit comfortably even if there are irregularities in the valleys of the deck plate.

Further, since the legs are formed in a U-shape as a whole, the entire U-shape resists input from the support rod, which is advantageous in terms of strength.

Furthermore, since the legs are continuously bent and formed from a single bar in the factory, attachment to the support rod becomes easy and the dimensions are constant, which is advantageous in terms of production.

<Embodiment> A preferred embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Here, parts common to the conventional example are given the same reference numerals, and redundant explanations will be omitted.

20 is a support rod, which is a straight bar. Numeral 21 is a leg, which is formed by bending a steel rod into a U-shape. These plurality of legs 21, 21... are formed by bending a single rod in a spiral-like continuous state, and are joined in an inclined state so as to be alternately located on both the left and right sides of the support rod 20. There is. That is, the lower semicircular portion of the leg body 21 serves as a concrete receiving portion 21a, and is placed in the valley portion 1a of the deck plate 1. and,
The ends 21b of the legs 21 located at both ends of the support rod 20 are
The adjacent leg body 2 is folded inward in parallel with the support rod 20.
1 by welding.

Here, if the thickness of the concrete slab 2 is H1, the predetermined net cover amount is C1, the diameter of the support rod 20 is D, and the thickness of the welded wire mesh 3, etc. is T, then the height h of the legs 21 is: h=H-C-T
-D (see Figure 2).

In the deck plate spacer according to the present invention configured as described above, since the concrete receiving part 21a is provided at the lower part of the leg body 21, when concrete is poured, the concrete is first moved by its own weight to the concrete receiving part 21a.
Since 1a is held down, when the concrete casting surface rises and reaches the support rod 20, the spacer 22 is prevented from lifting up against the force of the upper surface of the concrete trying to push up the support rod 20. As a result, it is possible to always ensure a predetermined "coverage", so the concrete slab 2
Surface cracks can be effectively prevented.

Further, since the concrete receiving portion 21a is formed into a substantially semicircular shape, when the spacer 22 is installed, it is supported at one point at the lowest end, making it easier to sit.

That is, even if there are irregularities in the troughs 1a of the deck plate 1, there is no wobbling because the concrete receiving portion 21a is not supported by a line unlike the case where the concrete receiving portion 21a is formed linearly at the lower end of the leg 21.

Further, since the leg body 21 is formed in a substantially U-shape, the leg body 21 integrally resists the upper load, which is advantageous in terms of strength. Thereby, even if a worker walks or works on the welded wire mesh 3 or the like installed on the spacer 22, deformation of the welded wire mesh 3 or the like can be prevented.

Furthermore, since the legs are formed by continuously bending a single rod, attachment to the support rod becomes easy, which is advantageous in terms of manufacturing. Moreover, the spacer 22 of constant quality can be manufactured by factory production.

Here, the member dimensions of the support rod 20 and the leg body 21 are not particularly limited, but as an example, the support rod 20 is made of a straight steel rod with a diameter of 9 mm, and the leg body 21 is made of a single steel rod with a diameter of 5 mm. One example is a spacer formed from a rod and having a total length L=600 cm. Using this spacer 22 as a standard, a spacer 22 of a required size can be obtained by varying the length and height h. In addition, if the height h increases, reinforcing material (
If a (not shown) is provided horizontally at a mid-height position of the leg 2I, the overall strength of the spacer 22 will be further improved, and it will also serve as a concrete receiving part when concrete is poured up to the support rod 20. Spacer 22
It also helps prevent floating.

Further, the treatment of the ends of the legs 21 located at both ends of the support rod 20 is not limited to that shown in the above embodiment, and may be joined in a way that does not get in the way during transportation and installation and is easy to manufacture. .

In addition, in the above embodiment, the concrete receiving part 21a
Although only a semicircular shape has been described, the present invention is not limited to this. That is, a linear member may be provided above the lowermost end of the legs 6 of the spacer 4 shown as a conventional example and this may be used as a concrete receiving part, or a linear member may be used as a concrete receiving part. The tip of the concrete can be extended horizontally and this part can be used as a concrete receiving part.

Further, in the above embodiment, the leg body 2 is formed in a U-shape.
1 is described as an example in which a single bar is bent in a continuous helical shape, but the invention is not limited to this. The same action and effect can be obtained even if it is formed as follows.

<Effects of the Invention> As explained above, the deck plate spacer according to the present invention has a concrete receiving part at the lower part of the leg body, so that when concrete is poured up to the support rod, the uplift that acts on the support rod is reduced. By preventing the spacer from lifting up against the blade and ensuring a predetermined amount of cover J, it is possible to prevent cracks on the surface of the concrete slab.In addition, since the concrete receiving part is approximately semicircular, it is possible to prevent the spacer from lifting up. In addition, since the legs are formed into a U-shape as a whole, they provide resistance as a whole, which is advantageous in terms of strength.Furthermore, the legs are formed by continuously bending a single bar at the factory. Since it is bonded to the support rod, manufacturing is easy and high quality spacers can be stably manufactured.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a deck plate spacer according to an embodiment of the present invention, Fig. 2 is an end view seen from the direction indicated by the arrow ■ in Fig. 1, and Fig. 3 is an end view viewed from the direction indicated by the arrow ■ in Fig. 1. 4 is a perspective view showing a conventional deck plate spacer, FIG. 5 is a sectional view taken along the line V-v in FIG. 6, and FIG. 6 is a conventional deck plate spacer. FIG. 2 is a partially cutaway perspective view showing a state in which the 3... Welded wire mesh (rebar member) 20... Support rod 21... Leg body 21a... Concrete receiving part 22... Spacer

Claims (4)

[Claims] (1) A deck plate spacer comprising a plurality of height setting legs suspended from a support rod supporting a reinforcing steel member, characterized in that a concrete receiving portion is provided at the bottom of the legs. spacer. (2) The deck plate spacer according to claim 1, wherein the concrete receiving portion has a substantially semicircular shape. (3) The spacer for a deck plate according to claim 2, wherein the legs are formed in a generally U-shape as a whole, and the lower part of the U-shape is a semicircular concrete receiving part. (4) The spacer for a deck plate according to claim 3, wherein a plurality of substantially U-shaped legs are formed by bending a single bar into a continuous spiral shape.