JPH10220446A - Anchor bolt, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the working and improve the production efficiency by providing a screw on an upper inner circumferential surface and/or an upper outer circumferential surface of a metallic pipe, integrating a hollow expanded anchor part with a lower end part of the pipe, and fitting a plug body to a hollow part. SOLUTION: In manufacturing an anchor bolt 1, a metallic round pipe 2 is used, and a screw 3 is cut on an upper inner circumferential surface of the metallic round pipe 2. Then, a lower end part of the metallic round pipe 2 is pressed and expanded into a hexagonal shape to form a hollow expanded anchor part 4. A plug body 5 which is separately prepared, is fitted to a lower hollow part of the metallic round pipe 2 from the inside of the hollow expanded anchor part 4 of the anchor bolt 1, and fixed for completion so that the plug body is not detached from the metallic round pipe 2. Because the metallic round pipe is used, the whole weight can be reduced, and a complicated working can be dispensed with.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor bolt inserted into concrete or the like and a method of manufacturing the same, and more particularly, to an anchor bolt formed by processing a hollow metal pipe, and an anchor bolt. And a method for producing the same.

[0002]

2. Description of the Related Art The present invention relates to an anchor bolt of this type and a method of manufacturing the same, which are disclosed in Japanese Patent Publication No. 57-22684 or FIGS. 5 (A), 5 (B), 5 (C) and 5 (D). Its manufacturing method is well known. That is,
An anchor bolt 51 shown in FIG.
As shown in (B), a screw hole 53 is formed in the upper part of a solid metal bar 52, and two cutting blades 54, 55 cross each other from the opposite center at the lower center of the metal bar 52. As a result, the lower part is divided at the center cross section, and the legs 56, 5
7, and by bending these legs 56 and 57 up and down.

[0003]

However, in the conventional anchor bolt 51, since a deep screw hole 53 must be formed in the upper part of the solid metal bar 52, there is a problem that the screw hole processing is troublesome. . Further, the lower part of the metal bar 52 is
Since the legs 56 and 57 must be formed by being cut by the cutting blades 54 and 55 and the legs 56 and 57 must be bent, a special processing device must be used.
In addition, there is a problem that processing is extremely complicated, work efficiency is low, and cost is high.

An anchor bolt and a method of manufacturing the same according to the present invention are completely new technologies developed in view of the above-mentioned conventional problems, and in particular, an anchor bolt using a metal pipe and a method of manufacturing the same. An anchor bolt having a structure in which a screw is provided on the upper inner peripheral surface or the upper outer peripheral surface or both, and a hollow enlarged diameter anchor portion is provided at a lower end portion, and a plug is further fitted into the lower hollow portion. The technology of the manufacturing method is provided.

[0005]

SUMMARY OF THE INVENTION An anchor bolt according to the present invention is a technique which fundamentally improves on the above-mentioned conventional problems, and the gist of the invention is to provide an upper inner peripheral surface or upper part of a metal pipe. A screw is provided on the outer peripheral surface or both of them, and a hollow enlarged diameter anchor portion is integrally formed at a lower end portion of the metal pipe, and a plug is fitted into a lower hollow portion of the metal pipe. An anchor bolt characterized by being worn and configured.

The gist of the method of manufacturing an anchor bolt according to the present invention is that a lower end portion of a metal pipe is expanded by pressing to form a hollow enlarged-diameter anchor portion, and an upper inner periphery of the metal pipe is formed. The surface or the upper outer peripheral surface or both are subjected to screw processing to cut screws, or the upper inner peripheral surface is subjected to screw processing before forming the hollow enlarged diameter anchor portion at the lower end of the metal pipe, Further, there is provided a method for manufacturing an anchor bolt, wherein a plug body is fitted into a lower hollow portion of the metal pipe to manufacture the anchor pipe.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an anchor bolt according to the present invention, and FIG.
(A), (B), (C) and (D) are explanatory views showing steps of manufacturing the anchor bolt of FIG. 1, respectively. FIG. 3 is a bottom view and a longitudinal sectional view of the anchor bolt of FIG. A), (B)
It is a perspective view of the anchor bolt of another example, respectively.

1 and 3, reference numeral 1 denotes an anchor bolt according to the present invention, in which a screw 3 is provided on an inner peripheral surface of an upper part of a metal round pipe 2. The lower end of the metal round pipe 2 is expanded in a hexagonal shape by press working to form a hollow enlarged diameter anchor 4. In the above embodiment, the hollow enlarged diameter anchor 4 is formed in a hexagonal shape, but the hollow enlarged diameter anchor 4 may be formed in a circular shape.

Further, a plug 5 is fitted in the hollow portion of the lower part of the metal round pipe 2. The plug 5 is made of a rubber material, a plastic material, or the like, and is fitted so as not to fall off from the inside of the hollow enlarged diameter anchor portion 4.

In producing the anchor bolt 1 according to the present invention, as shown in FIGS. 2A, 2B, 2C and 2D, a metal round pipe is used.
The screw 3 is cut on the upper inner peripheral surface of. Next, the lower end portion of the metal round pipe 2 is press-processed to expand the diameter into a hexagonal shape, thereby forming the hollow expanded anchor portion 4.

Subsequently, a plug 5 separately prepared in advance is fitted into the lower hollow portion of the metal round pipe 2 from the inside of the hollow enlarged diameter anchor portion 4 of the anchor bolt 1, and the plug is inserted from the metal round pipe 2. By fixing the body 5 so as not to fall off, the anchor bolt 1 according to the present invention can be manufactured.

In the above embodiment, the upper inner peripheral surface of the metal round pipe 2 was threaded before the hollow enlarged diameter anchor 4 was pressed. After the processing is completed, the upper inner peripheral surface of the metal round pipe 2 may be subjected to screw processing. Further, the base material used is not limited to the metal round pipe 2 but may be a metal square pipe.

Since the anchor bolt 1 according to the present invention uses the metal round pipe 2 as described above, the material cost is lower than in the case where a solid metal bar is used as in the prior art, and the press is performed at a lower cost. Processing can be facilitated and the lightweight anchor bolt 1 can be manufactured.

In the present invention, as described above, the metal round pipe 2 is used, and the lower end portion is expanded by pressing to form the hollow enlarged diameter anchor portion 4. It is not necessary to form a pair of legs by dividing the bar material by using a special device, and it is not necessary to further bend the legs, thereby greatly simplifying the processing operation.

Anchor bolt 1 constructed as described above
Since the lower end portion of the anchor bolt 1 is expanded to form a large-diameter hollow enlarged-diameter anchor portion 4, when the anchor bolt 1 is buried in concrete, the anchor bolt 1 has a large shearing force and a strong pull-out. If you do this, don't worry about falling out of the concrete. Further, since the plug 5 is fitted in the lower hollow portion, there is no fear that concrete flows into the anchor bolt 1.

In the above embodiment, the anchor bolt 1
In the production of, a metal round pipe 2 was used as a base material, but is not necessarily limited to a round pipe.
It is also possible to use square pipes.

In the above embodiment, the anchor bolt 1 which is used by being buried almost entirely in concrete has been described. However, as shown in FIG. The anchor bolt 1a used in the above can be formed by cutting a screw 3 on the upper outer peripheral surface. Further, as shown in FIG. 4 (B), it is also possible to form an anchor bolt 1b in which a screw 3 is cut on an upper outer peripheral surface and an inner peripheral surface, respectively.

[0018]

Since the anchor bolt and the method of manufacturing the same according to the present invention have the above-described structure and operation, they have the following significant effects.

(1) Since the metal pipe is used as the base material, the overall weight is light. (2) Therefore, transportation and handling are convenient, and material costs can be reduced. (3) It is possible to eliminate the need for screw hole processing during manufacturing.

(4) Therefore, the incidence of defective products can be reduced. (5) As in the past, using a special device, a part of the metal bar was cut vertically to make a leg,
It is possible to obviate the need for a complicated processing operation such as bending this. (6) It can be mass-produced inexpensively using a simple device. (7) Since a large diameter anchor is provided at the lower end, a large shearing force can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an anchor bolt according to the present invention.

2 (A), 2 (B), 2 (C) and 2 (D) are explanatory views showing steps of manufacturing the anchor bolt of FIG. 1, respectively.

FIG. 3 is a bottom view and a longitudinal sectional view of the anchor bolt of FIG. 1;

FIGS. 4A and 4B are perspective views of anchor bolts according to other examples.

FIGS. 5A, 5B, 5C, and 5D are explanatory views showing a conventional anchor bolt and its manufacturing process.

[Explanation of symbols]

1,1a, 1b Anchor bolt 2 Metal round pipe 3 Screw 4 Hollow enlarged diameter anchor 5 Plug body 51 Anchor bolt 52 Metal rod 53 Screw hole 54,55 Cutting blade 56,57 Leg

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kuniyuki Ichikawa 1-22-2 Nishishinjuku, Shinjuku-ku, Tokyo Haneda Hume Kanko Co., Ltd.

Claims (2)

[Claims] 1. A metal pipe is provided with a screw on an upper inner peripheral surface and / or an upper outer peripheral surface thereof, and a hollow enlarged diameter anchor portion is integrally formed at a lower end portion of the metal pipe. An anchor bolt characterized in that a plug is fitted into a lower hollow portion of the metal pipe. 2. A lower end portion of a metal pipe is expanded by press working to form a hollow enlarged-diameter anchor portion, and an upper inner peripheral surface and / or an upper outer peripheral surface of the metal pipe are threaded. Before forming a hollow enlarged diameter anchor at the lower end of the metal pipe, a screw is applied to the upper inner peripheral surface of the metal pipe, and a plug is further inserted into the lower hollow of the metal pipe. A method for manufacturing an anchor bolt, characterized by being fitted and manufactured.