JPH0729292Y2 - Anchor 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 anchor provided on a concrete wall or the like.

[0002]

2. Description of the Related Art Conventionally, various types of concrete anchors have been proposed to be attached to concrete walls or floors. An anchor bolt 70 as shown in FIG. 6 is a conventionally used concrete anchor. The anchor bolt 70 is provided with a tubular expansion body 72 having a slit 71 in the lower portion, and a male screw portion 73 is provided in the upper portion of the extension body 72. A pin hole 74 is formed inside the male screw portion 73 and the expansion body 72. An expansion pin 75 is inserted into the pin hole 74. 76 is the male screw portion 7
It is a nut screwed to 3. And anchor bolt 7
In the mounting method of 0, the expansion body 72 is embedded in the anchor mounting hole 78 of the concrete wall 77. Then the expansion pin 75
The anchor bolt 70 was fixed in the anchor mounting hole 78 by driving the anchor bolt 70 by expanding the lower part of the expander 72.

[0003]

However, in the conventional anchor bolt 70, only the lower portion of the expansion body 72 is expanded and fixed in the anchor mounting hole 78, so that it will come off when pulled in the axial direction. There was a problem that it was easy. In addition, the anchor bolt 70 has a problem that it is difficult to use the anchor bolt 70 in a wall, a ceiling, or the like, or a through hole in a wall or the like, which is impaired when vibration is generated. The present invention has been made in view of such circumstances, and an object thereof is to provide a concrete anchor that enhances tensile strength in the axial direction and does not generate vibration during mounting.

[0004]

A method according to the above-mentioned object.
The concrete anchor described above has a concrete expansion body that adheres the outer side to a peripheral wall of an anchor mounting hole provided in concrete, and a core rod body that is provided inside the expansion body and expands the diameter of the expansion body. An anchor for
The expansion body is divided into a plurality of expansion pieces, and the expansion piece is formed such that the thickness decreases from one side edge on the left and right sides to the other side edge, and the expansion piece has a peripheral surface on the outer side surface. A plurality of groove portions that become gradually deeper in the direction and in which each of the expansion pieces fits and engages with each other, and a prism portion for rotating the core rod body is provided on the upper portion of the core rod body. Has been done. A concrete anchor according to a second aspect of the present invention is the concrete anchor according to the first aspect, wherein a male screw portion is provided between the core rod and the prism portion.
A concrete anchor according to a third aspect is the concrete anchor according to the first aspect, wherein a female screw portion is provided inside the core rod and the prismatic portion.

[0005]

In the concrete anchor according to the first to third aspects, the core rod body provided with the expansion piece is embedded in the anchor mounting hole provided in the concrete, and the prismatic portion is rotated by using a wrench or the like. The core rod rotates together with the prism, and the shallow part of the groove presses the thick part of the expansion piece into the anchor mounting hole. The expansion piece functions as a wedge between the anchor mounting hole and the core rod body to enhance tensile strength.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. 1 is an exploded perspective view of a concrete anchor according to the first embodiment of the present invention, FIG. 2 is a front view of the concrete anchor, and FIG. 3 is an explanatory view showing a method of using the concrete anchor. is there. As shown in FIGS. 1 and 2, a concrete anchor 10 according to a first embodiment of the present invention includes three expansion pieces 11, 12, and 13 and a core rod 1.
4 is provided. The extension pieces 11, 12, 13 are
Using steel as a material, as shown in FIGS. 1 and 3, it is formed so that the thickness decreases from one side edge on the left and right sides to the other side edge, and the entire body is curved and twisted diagonally. Has been formed. The core rod body 14 is made of steel,
The bottom portion is provided with a disc-shaped locking portion 15 that locks the lower ends of the expansion pieces 11, 12, and 13, and is gradually deepened in the circumferential direction on the outer side surface, and a plurality of groove portions 16 and 17 are formed obliquely downward from above. ,
18 is formed, and the expansion piece 11 is fitted in the groove portion 16, the expansion piece 12 is fitted in the groove portion 17, and the expansion piece 13 is fitted in the groove portion 18. Further, a male screw portion 19 is provided on the upper portion of the core rod body 14, and a prismatic portion 20 having a four-sided peripheral edge is provided on the top portion thereof. A nut or the like can be screwed into the male screw portion 19.

Next, a method of using the concrete anchor 10 will be described with reference to FIG. First, an anchor mounting hole is provided in a concrete wall, floor, ceiling, or the like, and the expansion rods 11, 12, and 1 are provided in the anchor mounting hole together with the core rod body 14.
3 is buried. Next, the prism 20 is rotated clockwise using a wrench or the like. The rotation of the prismatic portion 20 causes the core rod 14 to rotate in the direction of the arrow as shown in FIG. 3, and the shallow portion of the groove of the groove 16 of the core rod 14 causes the thick portion of the expansion piece 11 to move outward. Each of the grooves 17 and 18 also presses each of the expansion pieces 12 and 13 outward in the same manner. The expansion pieces 11, 12 and 13 pressed outwardly contact the peripheral side surface of the anchor mounting hole, function as a wedge between the anchor mounting hole and the core rod body 14, and fix the concrete anchor 10 to the anchor mounting hole. Fixed to. Since the contact surface between the expansion pieces 11, 12 and 13 and the anchor mounting hole is large, the tensile strength in the axial direction can be greatly increased as compared with the conventional concrete anchor. Further, when the prismatic portion 20 is rotated counterclockwise, the expansion piece 11,
The wedge function of 12, 13 is lost and the concrete anchor 10 can be easily pulled out and reused.

Next, a concrete anchor according to a second embodiment of the present invention will be described. FIG. 4 is a front view of a concrete anchor according to a second embodiment of the present invention, and FIG. 5 is a plan view of the concrete anchor. The concrete anchor 21 according to the second embodiment of the present invention is
As shown in FIGS. 4 and 5, expansion pieces 11, 12 and 13 similar to those shown in FIG. 1 are used as expansion pieces, and a core rod body 22 is provided inside the expansion pieces 11, 12 and 13. ing. Grooves 16, 17, and 18 similar to those shown in FIG. 1 are formed on the outer side of the core rod body 22, a prismatic portion 23 having a peripheral surface formed by six faces is provided on the upper portion, and a lower portion is provided on the lower portion. Is formed with a locking portion 24, and further the female screw portion 2 is provided on the inner side.
5 is formed.

Subsequently, the method of using the concrete anchor 21 is substantially the same as the method of using the concrete anchor 10 according to the first embodiment shown in FIG. The difference from the method of using the concrete anchor 10 according to the first embodiment is that the concrete anchor 10 can be used by screwing a nut or the like into the male screw portion 19.
The concrete anchor 21 is that a bolt or the like can be screwed into the female screw portion 25 for use.

Although the expansion pieces 11, 12 and 13 are formed by twisting, they may be formed straight without twisting, and corresponding to the straightened expansion pieces, the core rod body may be formed. The groove may be formed straight in the vertical direction, and steel is used as the material, but it is also possible to use other metal material such as stainless steel or plastic material. The cross sections of the prismatic portions 20 and 23 are quadrangular and hexagonal, respectively, but may be formed in other shapes as long as they can be fixed with a tightening tool such as a wrench. The male screw portion 19 is not provided on the upper portion of the core rod body 14,
A hook via the prismatic portion may be provided.

[0011]

In the concrete anchor according to claims 1 to 3, an expansion piece and a core rod body are provided, and the core rod body is rotated to press the expansion piece outwardly. It functions as a wedge between the anchor mounting hole and the core rod body, and can increase the tensile strength of the concrete anchor in the axial direction. Also, the concrete anchor,
Since the expansion piece is used and vibration due to driving does not occur, it can be attached to a wall, a ceiling or the like which is impeded by the vibration, and also to a through hole of the wall or the like.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a concrete anchor according to a first embodiment of the present invention.

FIG. 2 is a front view of the concrete anchor.

FIG. 3 is an explanatory view showing a method of using the concrete anchor.

FIG. 4 is a front view of a concrete anchor according to a second embodiment of the present invention.

FIG. 5 is a plan view of the concrete anchor.

FIG. 6 is an explanatory view showing a usage state of a conventional anchor bolt.

[Explanation of symbols]

 10 Concrete Anchor 11 Expansion Piece 12 Expansion Piece 13 Expansion Piece 14 Core Rod 15 Locking Part 16 Groove 17 Groove 18 Groove 19 Male Screw 20 Prismatic 21 Concrete Anchor 22 Core Rod 23 Prismatic 24 Locking 25 Female thread

Claims (3)

[Scope of utility model registration request] 1. An anchor for concrete having a tubular expansion body that adheres an outer side to a peripheral wall of an anchor mounting hole provided in concrete and a core rod body that is provided inside the expansion body and expands a diameter of the expansion body. The expansion body is divided into a plurality of expansion pieces, and the expansion piece is formed such that the thickness decreases from one side edge on the left and right sides to the other side edge. A plurality of groove portions are formed on the side surface, which are gradually deepened in the circumferential direction so that each of the expansion pieces fits and engages with each other, and a prism portion for rotating the core rod body is formed on the upper portion of the core rod body. Anchor for concrete characterized by being provided. 2. The concrete anchor according to claim 1, wherein a male screw portion is provided between the core rod and the prism. 3. The anchor for concrete according to claim 1, wherein internal threads are provided inside the core rod and the prism.