JPH0521371Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Industrial Application Field) The present invention relates to a spacer for supporting cage reinforcement, which is used by being attached to cage reinforcement used as a reinforcing material for lightweight aerated concrete members. (Prior art) Conventionally, as a spacer for supporting cage reinforcement, a plate-shaped spacer made of a plate-shaped body as described in Japanese Utility Model Publication No. 54-30373 and shown in FIG.
There is a spacer described in Publication No. 50-22988 and shown in Figure 4, which is made by combining four wire rods in a grid shape and welded, and a spacer described in Publication No. 52-4739 and shown in Figure 4.
There is a spacer, etc., which is made by combining and welding two wire rods bent into a U-shape, facing each other, as shown in the figure. These spacers for supporting cage reinforcement are used to provide a space between two welded wire meshes 1' and 1'' to form cage reinforcement 1, as shown in FIG. The upper spacer 6 shown is a spacer in which the four sides of the hole in the center are equal, and the lower spacer 2 is a spacer with a rectangular hole 3. 1 is suspended by a support rod 7 within a molding frame 10 of lightweight aerated concrete as shown in FIG. 7.The cage reinforcement 1 is suspended by the support rod 7 as shown in FIG. By inserting the support rod 7 having a notch 9 at the bottom and a flat plate 8 at the tip into the elongated hole 3 of the lower spacer 2, which is a spacer for supporting the cage muscle, and rotating the support rod 7 by 90 degrees, as shown in FIG. As shown in FIG. 7, the car reinforcement 1 is supported by the support rod 7 which is inserted into the lower part of the long side around the hole of the lower spacer 2. As shown in FIG. Then, a raw material slurry for lightweight cellular concrete is injected into the formwork 10 in which the cage reinforcement 1 supported by the support rod 7 is suspended in the lower spacer 2 and hardened to produce a preformed body for lightweight cellular concrete. After this preform reaches a predetermined hardness, the support rod 7 is rotated 90 degrees and then pulled upward to remove the support rod 7, and then the cage wire 10 is centered. (Problem to be Solved by the Invention) When using any of the conventional cage reinforcement spacers shown above, the fifth Even in the case of a spacer in which the wire rods are doubled on the short side of the hole shown in the figure, as mentioned above, the support rod can be rotated 90 degrees in the lightweight aerated concrete preform to remove the lower part of the support rod. When pulling the support rod upward after releasing the spacer, the notch 9 at the bottom of the support rod 7 tends to get caught on the spacer. , the entire cage reinforcement 1 is pulled up a little, and the support rod 7 and the lower spacer 2 are separated.In this way, the lightweight aerated concrete preform is formed, and the position of the cage reinforcement 1 is slightly changed in a state where it has hardened to some extent. This resulted in a lightweight aerated concrete product with gaps around the cage bars, which could also cause physical problems. (Means for solving the problem) Spacer for supporting the cage bars of the present invention is a spacer for supporting cage reinforcement used by attaching it to cage reinforcement used as a reinforcing material for lightweight aerated concrete members, and is made entirely of plate-shaped material, with two opposing pieces having a V-shaped spacer. It has a bent groove,
The plate material has a rectangular hole in the center thereof, the short side of the hole is parallel to the groove, and a vertical portion is provided that protrudes along the short side. It is something. (Example) Hereinafter, the present invention will be explained using the example shown in FIG. Fig. 1 shows one embodiment of the spacer for supporting cage reinforcement of the present invention, in which Fig. A is a perspective view, Fig. B is a cross-sectional view taken from Fig. A along the line A-A', and Fig. C is a cross-sectional view taken from Fig. A along the line B--
FIG. 3 is a cross-sectional view taken along line B'. As seen in FIG. 1, the cage support spacer 2 is entirely made of a plate-like material, and has grooves bent into a V-shape in two opposing pieces. Similar to the conventional plate-shaped spacer shown in FIG. 3, this V-shaped groove serves to improve weldability with a welded metal mesh when forming a cage line. That is, the groove and the reinforcing bars of the welded wire mesh are perpendicular to each other so that they can be easily welded together. In addition, the spacer for supporting cage reinforcement in FIG. 1 has a rectangular hole 3 in the center of the plate material, and the short side of the hole 3 is parallel to the groove, and the short side 5
The plate material is bent to provide a protruding vertical portion. Generally, a thin plate with a thickness of 3 mm or less (i.e., the thickness of the long side of the hole 3) is preferably used.
The thickness of the short side 5 including the vertical part is 5 to 6 mm (i.e.
The height of the protrusion on the vertical portion is preferably 2 mm or more. For comparison, the diameter is 3 mm as shown in Figure 2.
A hole 3, a long side 4, and a short side 5 are formed using a wire rod of
A spacer for supporting cage reinforcement is welded to a real wire rod, a plate-shaped spacer for supporting cage reinforcement made from a plate with a thickness of 3 mm as shown in Figure 3, and two spacers for supporting cage reinforcement with a diameter of 3 mm as shown in Figure 5. A spacer for supporting cage reinforcement using a wire rod bent into a U shape, and a plate-shaped spacer with a thickness of 3 mm and a protrusion height on the short side (height of the part protruding above the plate material) of 2 mm as shown in Figure 1 above. EXAMPLE 1 A lightweight cellular concrete preform with cage reinforcement was manufactured using a spacer for supporting cage reinforcement according to an example of the present invention. For comparison, a lightweight aerated concrete preform was also created using a formwork in which only support rods were suspended from the top of the formwork without using cage reinforcement. This is called a blank (no spacer) condition. In these experiments, after rotating the support rod 90 degrees to disengage the support rod and spacer,
A spring scale was attached to the support rod, the support rod was pulled up by lifting the spring, and the pull-out resistance of the support rod was measured. Even under the blank condition without a spacer, the support rod was rotated 90 degrees, a spring scale was attached to the support rod, the spring was lifted to pull up the support rod, and the pull-out resistance of the support rod was measured. These measurements were conducted using 20 spacers for each condition, and the average value of the pull-out resistance when pulling out the support rod was determined for each condition. The results are shown in Table 1. In Table 1, the types of spacers are indicated by drawing numbers.

[Table] As shown in Table 1 above, there are not only spacers where the short side around the hole has the same thickness as the long side as shown in Figure 5, but also spacers as shown in Figures 2 and 5. Even if the wire rod is doubled on the short side around the hole to increase the thickness of the short side, the pull-out resistance of the support rod will be large compared to the blank condition without a spacer, and it will be difficult to pull out the support rod. This shows that the notch at the lower end of the support rod gets caught on the spacer when it is removed. On the other hand, when the spacer of the embodiment of the present invention is used, the pull-out resistance is equal to that of the blank, indicating that the notch at the lower end of the support rod does not catch on the spacer when the support rod is pulled out. Ta. (Effect of the invention) The cage reinforcement spacer of the present invention is used to hold the cage reinforcement in the formwork by the support rod, and after the raw material slurry for lightweight cellular concrete has hardened to a predetermined hardness, a lightweight cellular concrete preform is produced. When the support rod is pulled out from inside, the resistance due to the spacer is hardly felt, and the excellent effect of preventing displacement of the cage wire during the work of pulling out the support rod is exhibited.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the cage muscle supporting spacer of the present invention, in which figure A is a perspective view and figure B is a perspective view.
The figure is a cross-sectional view of figure A taken along the line A-A', figure C is a cross-sectional view of figure A taken along the line B-B', and figure 2 is a diagram showing a spacer for supporting cage reinforcement of a comparative example. ,
Figure A is a perspective view, Figure B is a cross-sectional view of Figure A taken along line A-A', Figure C is a cross-sectional view of Figure A taken along line B-B', Figures 3, 4, and Figure 5 is a perspective view showing various conventional cage reinforcement spacers, Figure 6 is a perspective view of a cage reinforcement made by assembling the cage reinforcement spacer and welded wire mesh, and Figure 7A is a support for cage reinforcement with spacers. Fig. 7B is an enlarged sectional view of the part indicated by A in Fig. 7A, and Fig. 8 is a side view of the cage suspended in the formwork by a rod. FIG. 9 is a side sectional view of the state shown in FIG. 7 with the support rod rotated 90 degrees. DESCRIPTION OF SYMBOLS 1...Cage bar, 2...Spacer for supporting cage bar, 3...Hole, 4...Long side of hole, 5...Short side of hole, 6...Top spacer, 7...Support rod, 8...
... lower flat plate part, 9 ... lower notch part, 10 ... formwork.

Claims (1)

[Scope of utility model registration request] This is a spacer for supporting cage reinforcement used by being attached to cage reinforcement used as a reinforcing material for lightweight aerated concrete members. The plate material has a rectangular hole in the center thereof, and the short side of the hole is parallel to the groove, and a protrusion is formed along the short side. A spacer for supporting cage reinforcement, characterized by having a vertical portion that supports the cage.