JP2500294Y2 - Hook bolt - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hook bolt for fixing a concrete panel to a steel material.

[0002]

2. Description of the Related Art For example, there is a mounting structure using hook bolts as a structure for mounting a lightweight cellular concrete panel on a frame to form an outer wall of a building. This is to fix the end of the L-shaped hook bolt to the structural steel of the skeleton by welding, penetrate the concrete panel and tighten the nut to fix the panel to the hook bolt and then to the structural steel. Is. Conventionally, this hook bolt has been manufactured by bending a steel round bar into an L-shape and threading the end.

[0003]

However, in the hook bolt having the above construction, the cross section is circular as shown in FIG. 7, and therefore the hook bolt 1 and the shaped steel 2 are merely in line contact with each other. For this reason, the hook bolt 1 is easy to move so as to roll with respect to the welding surface of the shaped steel 2, and the hook bolt 1 cannot be stably applied to the shaped steel 2, so that the hook bolt 1 does not tilt. However, there is a drawback in that the welding work must be carried out while carefully holding it, and the work cannot be carried out smoothly. Further, even if the welding work is carried out carefully, the conventional hook bolt 1 may actually be welded with an inclination as shown in FIG. In this case, there is a problem in that welding work must be redone because it also interferes with the work of mounting the concrete panel.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a hook bolt capable of easily performing a welding operation on a steel material.

[0005]

The hook bolt according to the present invention is characterized in that a flat portion is formed at a contact portion with a steel material in a base end portion welded to the steel material.

The hook bolt is manufactured by processing a round bar, and in this case, the removal depth from the peripheral surface for forming the flat portion is 1/10 to 1/4 of the diameter of the round bar. Is desirable.

[0007]

According to the hook bolt of the above means, the flat portion is formed at the contact portion with the steel material. Therefore, if the flat portion is brought into close contact with the steel material, the hook bolt does not roll on the steel material. It is addressed stably. As a result, the welding work can be performed smoothly without worrying about the inclination of the hook bolt.

Further, if the removal depth from the peripheral surface for forming the flat portion is set to 1/10 to 1/4 of the diameter of the round bar, experimentally while ensuring sufficient strength of the hook bolt, It was confirmed that the hook bolt could be stably applied to the steel material.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A description will be given with reference to FIGS.

First, FIG. 2 shows an example of a structure for mounting a concrete panel 12 made of lightweight cellular concrete using the hook bolt 11 of the present invention. In the figure, the shaped steel 13 as a steel material constitutes, for example, the frame of a building, and the concrete panel 12 constitutes, for example, the outer wall of the building. A hook bolt 11 penetrates the concrete panel 12, and a nut member 14 is screwed into the hook bolt 11 to fix the hook bolt 11 to the concrete panel 12. An end portion of the hook bolt 11 projecting from the concrete panel 12 is bent into a substantially L-shape and is welded to the shaped steel 13.

Now, the overall shape of the hook bolt 11 is as shown in FIG. 1, and its manufacturing method and structure will be described as follows.

First, a round bar made of steel is cut into a predetermined length dimension, and a flat portion 15 is formed on a part thereof. In order to form the flat portion 15, the round bar may be cold or hot forged by, for example, a forging machine. At that time, the round bar is housed in a die having a groove having a semicircular cross section and pressed. It is preferable. If there is no die, the round bar is crushed and deformed so that the cross section of the round bar becomes oval. However, if the die as described above is used, the cross section of the round bar is almost circular as shown in FIG. This is because it will be maintained. Further, it was found from the experiment that the removal depth d (see FIG. 5) from the peripheral surface for forming the flat portion 15 is 1/10 to 1/4 of the diameter D of the round bar. did. This is because if it is less than 1/10 of the diameter D, the effect of forming the flat portion 15 is not sufficiently exerted, and if it exceeds 1/4 of the diameter D, the strength of the hook bolt 11 may be reduced. In this example,
The diameter of the round bar was 12 mm.

Next, after forming the flat portion 15 as described above, the round bar is placed on a bender and bent at a substantially right angle in the vicinity of the end of the flat portion 15. The bending direction is such that the flat portion 15 is inside the bending. Finally, the hook bolt 11 is completed by threading the tip of the round bar to form the threaded portion 16.

The hook bolt 11 having such a structure
Is applied to the flange portion 13a of the shaped steel 13 and welded. At that time, in the hook bolt 11 of the present embodiment, if the flat portion 15 is directed to the flange portion 13a of the shaped steel 13, the entire area of the flat portion 15 comes into close contact with the flange portion 13a and comes into a surface contact state. The bolt 11 is stably applied to the shaped steel 13 without rolling motion. Therefore, the worker can proceed with the welding work promptly without having to worry about the hook bolt 11 tilting with respect to the shaped steel 13, and the work efficiency is greatly improved. Further, while the work can be carried out smoothly in this manner, the hook bolt 11 is provided with the flange portion 1 of the shaped steel 13 as shown in FIG.
Since it is fixed so as to always form a right angle with respect to 3a, the fixing quality is high, and there is no fear that it will interfere with the mounting of the concrete panel 12.

In the above embodiment, the flat portion 15 is formed by forging a round bar. However, in the present invention, the flat portion may be formed by any method, for example, the round bar may be ground with a grinder. The round bar may be deformed so as to be crushed simply by a press machine. FIG. 6 shows an example in which the round bar is crushed and deformed by pressing.

[0016]

As described above, according to the hook bolt of the present invention, since the flat portion is in surface contact with the steel material, the hook bolt can be stably applied to the steel material, and the welding work can be performed. It has an excellent effect that high-speed welding can be performed while high-speed welding can be performed.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view showing a mounting structure of a concrete panel using the hook bolt.

3 is a sectional view taken along the line AA in FIG.

FIG. 4 is an enlarged sectional view of a welded portion.

FIG. 5 is a cross sectional view of the hook bolt.

FIG. 6 is a cross-sectional view of hook bolts according to different embodiments.

FIG. 7 is a view corresponding to FIG. 3 showing a conventional hook bolt.

FIG. 8 is a sectional view showing an example of a conventional hook bolt welding failure.

[Explanation of symbols]

 11 ... Hook bolt 12 ... Concrete panel 13 ... Shaped steel (steel material) 14 ... Nut member 15 ... Flat part

Claims (2)

(57) [Scope of utility model registration request] 1. A portion between the base end side and the tip end side is bent,
In order to fix the concrete panel to the steel material by welding the base end portion to steel material and inserting the tip end portion into a concrete panel and screwing a nut member to the tip end portion, the base end portion A hook bolt, wherein a flat portion is formed at a contact portion of the portion with the steel material. 2. A round bar manufactured by machining, wherein a removal depth from a peripheral surface for forming a flat portion is 1/10 to 1/4 of a diameter of the round bar. Hook bolt characterized by.