JPH0643034U - Anchor for concrete - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a concrete anchor that enhances tensile strength in the axial direction and does not generate vibration during mounting. [Structure] An anchor 10 for concrete includes a tubular expansion body that adheres an outer side to a peripheral wall of an anchor mounting hole formed in concrete, and a core rod body 14 that is provided inside the expansion body and expands a diameter of the expansion body. An anchor 10 for concrete having a plurality of expansion pieces 11, 1
The expansion piece 11, 12, 13 is divided into 2 and 13
Is formed so that the thickness thereof decreases from one side edge on the left and right sides to the other side edge, and gradually becomes deeper in the circumferential direction on the outer side surface of the core rod body 14 of the expansion pieces 11, 12, 13. A plurality of groove portions 16, 17 and 18 which are fitted and engaged with each other are formed, and a prism 20 for rotating the core rod body is provided on the core rod body 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a concrete anchor provided on a concrete wall or the like.

[0002]

[Prior art]

 Conventionally, various anchors for concrete to be attached to concrete walls or floors have been proposed. As an anchor for concrete which has been conventionally used, there is an anchor bolt 70 as shown in FIG. 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 expansion 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. Reference numeral 76 denotes a nut screwed onto the male screw portion 73. The anchor bolt 70 is attached by embedding the expansion body 72 in the anchor attachment hole 78 of the concrete wall 77. Next, the expansion pin 75 was driven in to expand the lower part of the expansion body 72 to fix the anchor bolt 70 in the anchor mounting hole 78.

[0003]

[Problems to be solved by the device]

 However, in the conventional anchor bolt 70, since only the lower part of the expansion body 72 is expanded and fixed in the anchor mounting hole 78, there is a problem that it is easily pulled out when it is pulled in the axial direction. Further, 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 the wall or the like, which is difficult to generate when vibration occurs. The present invention has been made in view of such circumstances, and an object thereof is to provide a concrete anchor that has high tensile strength in the axial direction and does not generate vibration during mounting.

[0004]

[Means for Solving the Problems]

 The anchor for concrete according to claim 1, which is in accordance with the above object, has a cylindrical expansion body that adheres the outer side to a peripheral wall of an anchor mounting hole formed in concrete, and expands the diameter of the expansion body provided inside the expansion body. An anchor for concrete having a core rod body, wherein the expansion body is divided into a plurality of expansion pieces, and the expansion piece becomes thinner from one side edge on the left and right sides to the other side edge. A plurality of groove portions are formed on the outer side surface of the core rod body, which gradually become deeper in the circumferential direction and are fitted and engaged with each of the expansion pieces. It is configured by providing a prismatic portion for rotating the rod body. According to a second aspect of the present invention, in the anchor for concrete according to the first aspect of the present invention, a male screw portion is provided between the core rod and the prismatic portion. A concrete anchor according to a third aspect is the anchor for concrete according to the first aspect, wherein a female screw portion is provided inside the core rod and the prismatic portion.

[0005]

[Action]

 In the concrete anchor according to any one of claims 1 to 3, the core rod body provided with the expansion piece is embedded in the anchor attachment hole provided in the concrete, and the prismatic portion is rotated 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 to enhance the tensile strength.

[0006]

【Example】

 Next, an embodiment of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. FIG. 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 explanation showing how to use the concrete anchor. It is a figure. 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 body 14. The expansion pieces 11, 12, and 13 are made of steel, and are formed such that the thickness decreases from one side edge on the left and right sides to the other side edge, as shown in FIGS. 1 and 3. It is formed by bending and twisting in an oblique direction. The core rod body 14 is made of steel, and has a disc-shaped locking portion 15 for locking the lower ends of the expansion pieces 11, 12, and 13 at the bottom, and is gradually deepened in the circumferential direction on the outer surface. A plurality of groove portions 16, 17, and 18 are formed in a diagonal direction from the upper side to the lower side. The expansion piece 11 fits in the groove portion 16, the expansion piece 12 fits in the groove portion 17, and the expansion piece 13 fits in the groove portion 18. Has become. Further, a male screw portion 19 is provided on an upper portion of the core rod body 14, and a prismatic portion 20 having a peripheral surface formed by four faces 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 attachment hole is provided in a concrete wall, floor, ceiling, or the like, and the extension pieces 11, 12, and 13 are embedded in the anchor attachment hole together with the core rod body 14. Next, the prism 20 is rotated clockwise using a wrench or the like. As shown in FIG. 3, the rotation of the prism 20 causes the core rod 14 to rotate in the direction of the arrow, and the shallow portion of the groove of the groove 16 of the core rod 14 moves the thick portion of the expansion piece 11 outward. Each of the grooves 17, 18 similarly presses each of the expansion pieces 12, 13 outwardly. 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 anchor the concrete anchor 10. Fix in the mounting hole. 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 wedge function of the expansion pieces 11, 12, and 13 is lost, and the concrete anchor 10 can be easily extracted 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. As shown in FIGS. 4 and 5, a concrete anchor 21 according to a second embodiment of the present invention uses expansion pieces 11, 12 and 13 similar to those shown in FIG. 1 as expansion pieces. A core rod body 22 is provided inside the pieces 11, 12 and 13. Grooves 16, 17, and 18 similar to those shown in FIG. 1 are formed on the outer side of the core rod body 22, and a prismatic portion 23 having a peripheral surface formed of six faces is provided on the upper portion and a lower portion. An engaging portion 24 is formed on the inner surface of the inner wall, and a female screw portion 25 is formed on the inner side.

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, while the concrete anchor 21 is used. The point 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 the core rod body may be formed corresponding to the straightened expansion piece. The groove may be formed to be straight in the vertical direction, and steel was used as the material, but other metal materials such as stainless steel or plastic material can be used. The cross sections of the prismatic portions 20 and 23 are quadrangular and hexagonal, respectively, but they 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 may not be provided on the upper portion of the core rod body 14 and a hook via a prismatic portion may be provided.

[0011]

[Effect of device]

 The concrete anchor according to any one of claims 1 to 3, wherein an expansion piece and a core rod body are provided, and the core rod body is rotated to press the expansion piece outwardly, and the expansion piece has an anchor mounting hole. It functions as a wedge between the core rod and the core rod, and can increase the tensile strength in the axial direction of the concrete anchor. Further, since the concrete anchor uses an expansion piece and does not generate vibration due to driving, it can be attached to walls, ceilings, etc. that are disturbed by the vibration, and also through holes in walls, etc. Can be installed.

[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 Thread 20 Prismatic 21 Concrete Anchor 22 Core Rod 23 Prismatic 24 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.