JP3460018B2 - Foundation anchor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foundation anchor, and more particularly to an anchor that can be embedded in a foundation with a small number of parts.

[0002]

2. Description of the Related Art For example, when installing mechanical equipment, it is common to embed an anchor in a foundation such as a floor of a factory and fix the base portion of the mechanical equipment to the anchor.

Conventionally, in this type of basic anchor, a substantially J-shaped anchor bolt is embedded in the foundation, and a hole of a base portion of mechanical equipment is fitted into a protruding portion of the anchor bolt.
It was fixed by tightening with a nut.

Recently, from the viewpoint of installation strength and stability,
As shown in FIG. 4, the anchor bolt 100 is used as a base 1
50 in the bottom of the anchor bolt 100.
The plate 120 is sandwiched between the nuts 110 and 110 to stop the anchor bolt 100 from coming off the foundation 150, the protruding portion of the anchor bolt 100 is fitted into the hole of the base portion 140 of the mechanical equipment, and the nut 130 is tightened and fixed. The so-called plate method has been proposed.

[0005]

However, in the conventional plate system, two nuts 1 are provided for each foundation anchor.
There is a problem that 10 and 110 are required, the number of parts is large, and the cost is high.

In view of the above problems, it is an object of the present invention to provide a basic anchor that can reduce the number of parts and reduce the cost.

[0007]

Therefore, the foundation anchor according to the present invention is constructed by embedding an anchor bolt upright in the foundation and locking the plate with a nut screwed to the lower end portion of the anchor bolt to form the foundation bolt. In the basic anchor adapted to be prevented from coming off from the nut, a flange portion having a size corresponding to the plate is integrally formed on the nut, and an internal thread is continuously formed on the inner surface of the hole of the flange section with the internal thread of the nut. It is characterized in that it is engraved and screwed with a male screw at the lower end portion of the anchor bolt, and the flange portion prevents the anchor bolt from coming off.

One of the features of the present invention is that the collar portion corresponding to the plate is formed integrally with the nut. As a result, one nut in the conventional plate system is unnecessary, the number of parts can be reduced and the cost can be reduced, and since the number of parts is small, the work of embedding in the foundation can be easily performed.

Further, the retaining strength of the anchor bolt depends on the screwing strength of the nut and the anchor bolt, and in order to secure the prescribed retaining strength, a predetermined number or more of threads are screwed together. I need to put it.

On the other hand, another feature of the present invention is that a female screw is formed on the inner surface of the hole of the collar portion. As a result, the number of threads of the internal thread of the nut can be reduced and therefore the height of the nut can be reduced,
It saves the material needed to manufacture the nut.

The collar portion is preferably formed at the end portion of the nut in the axial direction, but may be formed at an intermediate portion in the axial direction of the nut. Also, the collar may be formed by simply projecting to the side, but considering the case where an excessive tensile load is applied to the anchor bolt, the reinforcement between the nut body and the collar is taken into consideration. It is better to form the raised part of the.

In the present invention, the collar portion corresponding to the plate is formed integrally with the nut, but the same effect can be expected by forming a female screw on the inner surface of the hole of the plate and screwing it with the anchor bolt. .

That is, in the foundation anchor according to the present invention, an anchor bolt is erected and embedded in the foundation, and the plate is locked by a nut screwed to the lower end portion of the anchor bolt to prevent the anchor bolt from coming off from the foundation. In the basic anchor described above, a female screw is engraved on the inner surface of the hole of the plate and is screwed with the male screw at the lower end of the anchor bolt.

Also in the present invention, since the plate is screwed onto the anchor bolt, it is possible to screw a predetermined number of threads or more, and to secure the prescribed retaining strength of the anchor bolt. As a result, the number of threads of the internal thread of the nut can be reduced and therefore the height of the nut can be reduced, and the material required for manufacturing the nut can be saved.

In order to reduce the height of the nut, it is necessary that the flange portion or the plate is securely screwed into the male screw of the anchor bolt. Therefore, it is preferable that the female screw of the collar portion or the plate is screwed with at least two threads of the male screw at the lower end portion of the anchor bolt.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to specific examples shown in the drawings. 1 and 2 schematically show a preferred embodiment of a basic anchor according to the present invention. In the figure, the anchor bolt 10 has a straight rod shape, and male screws 11 and 12 are engraved at both ends thereof.

The anchor bolt 10 is vertically embedded in the foundation 150, and a nut 20 is screwed into the male screw 12 at the lower end of the anchor bolt 10. This nut 20
Then, as shown in FIG. 2, a circular collar portion 22 is formed laterally overhanging at the axial end portion of the nut body 21, and the collar portion 22 is set to a size corresponding to the conventional plate 120. .

The nut body 21 is provided on the inner surface of the hole of the collar portion 22.
At least two ridges are formed continuously with the female screw.

Further, a reinforcing inclined portion (raised portion) 23 is formed between the collar portion 22 and the nut body 21. It is possible to use so-called thread-bar reinforcement for the anchor bolts, but if pulling load is repeatedly applied to the anchor bolts, the foundation around the anchor bolts may collapse little by little and the anchor may loosen. Good to do.

For example, when mechanical equipment is installed, the anchor bolt 10 is erected upright on the foundation 150 as in the conventional case, but the lower end male screw 12 of the anchor bolt 10 is screwed with the female screw of the nut 20 to anchor the anchor bolt 10. Do not slip out. At that time, since the collar portion 22 is integrally formed with the nut body 21 and does not move freely with respect to the anchor bolt 10, the foundation 150 of the anchor bolt 10 is not formed.
It is possible to easily embed it in the.

When the anchor bolt 10 is embedded,
The hole of the base portion 140 of the mechanical equipment is fitted into the protruding portion of the anchor bolt 10, and the nut 130 is screwed into the male screw 11 at the upper end of the anchor bolt 10 to make the base portion 140.
Should be fixed.

Further, in the nut 20, since the female thread is formed on the inner surface of the hole of the collar portion 22, the number of threads of the female thread of the nut main body 21 can be reduced, and as a result, a nut corresponding to the height of the conventional nut and plate is combined. The overall height of the nut 20 can be made lower than in the conventional method, and the material required for manufacturing the nut 20 can be saved.

The inventors of the present invention made a prototype of a conventional basic anchor and a basic anchor of this example having the same mechanical characteristics as that of the conventional basic anchor and compared them. Regarding the conventional basic anchor, the plate thickness is 17 mm, the plate diameter is 84 mm, the nut width across flats is 42 mm, the nut height is 38 mm, and the bolt diameter is 30 m.
m, and the total height of the plate and the nut was 55 mm. On the other hand, regarding the basic anchor of this example, the thickness of the collar portion is 11 mm, the diameter of the collar portion is 84 mm, and the width across flats of the nut body is 42 mm.
mm, the total height of the nut including the collar portion and the raised portion was 42 mm, and the bolt diameter was 30 mm.
Therefore, it was found that the total height of the nut of this example, which corresponds to the total height of the conventional plate and the nut, can be lowered by 13 mm.

FIG. 3 shows a second embodiment of the basic anchor according to the present invention. In this example, as in the conventional case, the nut 30 and the plate 40, which are separately manufactured, are used for the anchor bolt 10.
The inner surface of the hole of the plate 40 has a female screw 41 that is screwed with the male screw 12 of the lower end portion of the anchor bolt 10.
There are at least two mountains formed.

As described above, even when the nut 30 and the plate 40 are separately manufactured, the height of the nut 30 can be reduced by engraving the female screw on the plate 40, and the plate 40 can also be manufactured. The thickness of can be reduced and the material required for manufacturing can be saved as a whole.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a preferred embodiment of a basic anchor according to the present invention.

FIG. 2 is a perspective view of the nut in the above embodiment as seen from below (a) and above (b).

FIG. 3 is a diagram showing a second embodiment.

FIG. 4 is a diagram showing a conventional basic anchor.

[Explanation of symbols]

10 Anchor bolt 11, 12 Male screw 20 nuts 21 Nut body 22 Collar 23 Inclined part (rising part) 30 nuts 40 plates 41 female screw

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-8-226132 (JP, A) JP-A-8-209802 (JP, A) JP-A-10-54413 (JP, A) JP-A-10- 195989 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E04B 1/41 502 E02D 27/00

Claims (3)

(57) [Claims] 1. A foundation anchor in which an anchor bolt is erected and embedded in a foundation and a plate is locked by a nut screwed to a lower end portion of the anchor bolt to prevent the anchor bolt from coming off from the foundation. Is integrally formed with a collar portion having a size corresponding to the plate, and between the nut body and the collar portion.
A bulging portion for reinforcement is formed, and an internal thread is continuously engraved on the inner surface of the hole of the flange portion to be continuous with the internal thread of the nut and screwed with the male thread of the lower end portion of the anchor bolt. A basic anchor characterized in that it is designed to prevent slipping out. 2. The foundation anchor according to claim 1, wherein the female screw of the flange portion is screwed with at least two threads of the male screw at the lower end portion of the anchor bolt. 3. A foundation anchor in which an anchor bolt is erected and embedded in a foundation, and the plate is locked by a nut screwed to the lower end portion of the anchor bolt to prevent the anchor bolt from coming off from the foundation. internal thread the anchor bolt into the hole inner surface
A basic anchor characterized by being engraved so as to be screwed with at least two threads of the lower end male screw of the above, and being screwed with the lower end male screw of the anchor bolt.