JPH086885Y2 - Insert for concrete - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete insert which is embedded in a cockleat and is locked to a hanging tool when the concrete is transported or installed.

[0002]

2. Description of the Related Art As a conventional technique, there is one shown in FIG. In FIG. 6, reference numeral 1 is an iron insert, which is formed by forging the right end portion of a cylindrical shaft portion 2 to form a skirt portion 3 having a large diameter and a conical shape, and a screw hole 4 at the shaft center portion of the shaft portion 2. Is formed.

[0003]

Since the conventional insert 1 forms the skirt portion 3 by forging, the amount of protrusion in the radial direction is limited, the amount of concrete adhered is reduced, and the skirt portion 3 is made of concrete. Since it cannot be bridged over the reinforcing bars embedded in the shape of a double girder, it cannot be firmly engaged with a thin concrete molded product such as a concrete panel. Further, the screw hole 4 formed in the shaft portion 2 has a blind pilot hole formed in the shaft portion 2 in order to prevent cement water from entering during burying, and a female screw is formed on the inner circumference of the pilot hole. However, this female screw cannot be formed to the deep part of the prepared hole. Therefore, the short shaft portion 2
In this case, the amount of internal thread becomes insufficient, and it becomes impossible to form a short insert. Further, the formation of the skirt portion 3 requires a large forging machine, which has a drawback that the equipment cost increases. It is an object of the present invention to obtain a novel concrete insert that overcomes the above drawbacks.

[0004]

SUMMARY OF THE INVENTION The present invention to achieve the above object, in the longitudinal central portion of the predetermined length metal rod material which is shredded in, allowed to compressive deformation in the radial direction, and, on the upper surface A plate-shaped flat portion having linear protrusions is formed, and a screw cylinder having a screw hole having a cross-sectional area smaller than the area of the flat portion is formed in the shaft center portion, and the screw cylinder is erected on the upper surface of the flat portion. A concrete insert characterized by being placed and fixed integrally by welding .

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partial cross-sectional side view showing an embodiment of the present invention. In FIG. 1, reference numeral 5 denotes an iron (metal) insert capable of resistance welding, in which an iron screw cylinder 7 is similarly welded and fixed to the longitudinal center of a rod main body 6 made of iron.

As shown in FIGS. 3 and 4, the rod main body 6 has a rectangular flat shape when viewed from the top by radially compressing the central portion in the longitudinal direction of a round rod 6a cut into a predetermined length by a pressing machine. The part 6b is formed. The flat portion 6b is formed by compressing the upper surface of the round bar in the lower surface direction, and simultaneously with this formation, a cross-shaped linear projection 6c is formed on the upper surface of the flat portion 6b.

The screw cylinder 7 has a screw hole 7 in the axial center portion.
A nut is formed and has a hexagonal outer shape and has a predetermined length. The outer diameter D (width between parallel sides) of the nut is approximately equal to the width W of the flat portion 6b. Then, the screw cylinder 7 is erected on the protrusion 6c on the upper surface side of the flat portion 6b, and a welding current (DC current) is applied between them to press the screw cylinder 7 in the direction of the flat portion 6b. , The protrusion 6c that is in contact with the screw cylinder 7 is melted by electric resistance heat, that is, resistance welding is performed to integrally fix the two.

According to the above-mentioned embodiment, the left and right ends 6d, 6d of the rod main body 6 largely protrude laterally from the screw cylinder 7, and as shown in FIG. 5, the left and right ends 6d, 6d are made of concrete. It is possible to bridge over the reinforcing bars 8a embedded in the shape of a cross girder, and the amount of concrete adhered increases, so that it can be firmly engaged with a thin concrete molded product 8 such as a concrete panel. The bottom surface of the screw cylinder 7 is closed by the flat portion 6b of the rod main body 6,
When the concrete molded product 8 is molded, the cement water is screwed into the screw cylinder 7.
Does not enter the screw hole 7a from the bottom of the. Further, since the rod main body 6 and the screw cylinder 7 can be made of commercially available round rods and nuts, they can be obtained at low cost, and the flat portion 6b of the rod main body 6 is the middle of the round rod 6a in the longitudinal direction. Since the portion is formed by compressing it in the radial direction, it can be formed by a small press machine.

Further, the area of the flat portion 6b can be changed by changing the thickness of the flat portion 6b, that is, the compression amount of the rod main body 6, and one type of rod main body 6 having different diameters can be used. It can be applied to various types of screw cylinders 7. Further, the bottom portion of the screw cylinder 7 is connected to the flat portion 6 of the separate rod main body 6.
Since it is closed by b, the female screw formed on the screw cylinder 7 can be formed over the entire length of the screw cylinder 7, and the short insert can be easily formed.

[0010]

As is apparent from the above description, according to the present invention, a short insert can be easily and inexpensively obtained. Further, since it can be engaged with the reinforcing bars in the concrete molded product, and the amount of concrete adhered is increased, it is possible to firmly engage with the thin concrete molded product.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side view of a rod main body according to the present invention.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a sectional view of a concrete molded article in which an insert according to the present invention is embedded.

FIG. 6 is a partial cross-sectional side view showing a conventional example.

[Explanation of symbols]

 5 Insert 6 Bar Main Body 6a Round Bar 6b Flat Part 6c Protrusion 7 Screw Tube 7a Screw Hole 8 Concrete Molded Product 8a Reinforcing Bar

Claims (1)

[Scope of utility model registration request] In the longitudinal central portion of claim 1. A predetermined length metal rod material which is shredded in being compressed and deformed in the radial direction and form a plate-like flat portion having linear protrusions on the top surface, A screw cylinder having a screw hole with a cross-sectional area smaller than the area of the flat portion is provided at the shaft center, and the screw cylinder is erected on the upper surface of the flat portion and integrally fixed by welding. A concrete insert characterized by the above.