JPH0725449Y2 - Anchor bolts for construction - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to an anchor bolt for construction which becomes an insert for concrete.

[0002]

2. Description of the Related Art Generally, as anchor bolts for construction buried in concrete, for example, anchors for mounting PC version fasteners, anchors for mounting equipment, signboards, etc., anchors for pedestals of steel columns, hybrid type concrete systems. There are various types such as anchors for curtain walls. In this case, the structure of this kind of anchor bolt has been
There is known a bolt shaft type in which a tip end of a simple bolt is bent at a right angle and a bolt shaft type with a locking member in which a horizontal pin for retaining is separately inserted at a lower end portion of the bolt shaft.

[0003]

However, in any of the above anchor bolts, the concrete embedding edge portion, which is the base end of the threaded portion of the bolt shaft projecting to the outside, has only one shaft portion exposed. Due to this mode, the shearing force of the bolt shaft is applied to the buried edge portion, which easily causes concrete crushing. Further, the latter anchor bolt type has a complicated structure in which a horizontal pin is separately inserted, and thus the manufacturing process is troublesome and the handling is not easy.

In view of the above situation, the present invention is a simplified type anchor bolt for construction that solves the above problems by providing flanges above and below a shaft on the concrete burying side and disposing a plurality of rotation preventing ribs. The purpose is to provide.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a single shaft type bolt main body in which a mounting shaft portion provided with a mounting screw at the upper end and a large diameter embedded shaft portion are connected to each other is formed, and the embedded shaft portion The retaining collars are arranged in parallel at the upper and lower positions, and a plurality of triangular detent rib pieces are projected from the outer periphery of the lower portion of the embedded shaft portion toward the periphery of the retaining collar at the lower end. It is a thing.

[0006]

As described above, since the two flange portions that serve as retaining members are arranged in parallel above and below the embedded position of the bolt main body that is a single shaft, the insertion into the bar arrangement is easy, and In order to match the upper flange to the concrete surface,
Implant depth is easily determined. Moreover, since the brim is located at the concrete burying edge, even if a shearing force due to bending etc. acts on the protruding bolt mounting side, the force is dispersed to the concrete surface and the concrete is not destroyed, and rotation is prevented. The force is blocked by the locking of the anti-rotation rib formed at the lower end of the bolt body, and the anchor bolt is used stably.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings of the embodiments.

1 is provided with a mounting screw 2 at the upper end and a mounting shaft portion 3
And a single-shaft type bolt main body in which a large diameter embedded shaft portion 4 is arranged in the lower part of the embedded shaft portion 2 to form two retaining collars 5 and 6 which are parallel to the upper and lower ends of the embedded shaft portion 4. In addition, four triangular detent rib pieces 7 which also serve as reinforcement are projected from the four-sided position (radial direction), which is the outer circumference of the lower portion of the embedded shaft portion 4, toward the peripheral edge of the lower end collar portion 5, and the entire construction thereof is provided. The anchor bolt for construction 8 is used.

To explain this action, first, the shape of the anchor bolt 8 is, for example, a large diameter (φ12) in which retaining collars 5, 6 (thickness of 22 mm and thickness of 3 mm) are arranged vertically.
Embedded shaft part 4 (length 30 mm) and mounting screw 2 (length 20
mm) and the mounting shaft part 3 (length 30 mm) that is provided 1
The main shaft type bolt main body 1 is formed, and triangular rotation preventing rib pieces 7 (height 6 mm × protruding width 3 mm) are arranged on the four sides of the retaining flange 6 at the lower end by welding or the like.

Here, when burying in concrete A, the retaining collar portion 5 disposed in the middle of the anchor bolt 8 faces the position of the concrete placing surface a, and the retaining collar portion 6 and the triangular rotation stopper. When the embedded shaft portion 4 having the rib pieces 7 disposed therein is set in a form (not shown) and concrete A is then struck, the anchor bolt 8 is fixed by embedding the base portion. Buried shaft 4 in this concrete pouring
Since the anti-rotation rib piece 7 at the base has a wedge shape from the upper part toward the lower part, it reaches the lower end collar part 6 smoothly.

The embedded portions are vertically secured by retaining collars 5, 6
Since the triangular anti-rotation rib piece 7 is in a state of overhanging in the concrete, it is a stable fixing that does not slip out or rotate.

When fixing the fixing jig B such as an angle, the fixing jig B is inserted into the protruding mounting shaft portion 3 and the nut 9 is screwed into the mounting screw 2 to be tightened. in this case,
Since the fixing jig B faces the upper surface of the retaining collar 5 arranged above the embedded shaft portion 4, the shearing force applied to the mounting shaft portion 3 is received by the retaining collar portion 5, so that the concrete placing surface a is It will not be crushed.

[0013]

As described above, since the anchor bolt for construction of the present invention is formed with a large-diameter embedded shaft portion above and below the retaining collar portion and a plurality of triangular detent pieces at the lower portion thereof. The concrete to be poured will flow in smoothly and will be received by the two retaining collars that are parallel to each other in the vertical direction. Moreover, since the plurality of triangular detent pieces are arranged radially, the detent action can be achieved with the minimum rib protrusion. Furthermore, the present invention has a practical effect that it is easy to handle because it presents a simple unit structure as a whole.

[Brief description of drawings]

FIG. 1 is a front view of an anchor bolt showing an embodiment of the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is a perspective view of the same.

FIG. 4 is an explanatory view of a usage state of being embedded in concrete.

[Explanation of symbols]

 1 1-axis type bolt main body 2 Mounting screw 3 Mounting shaft part 4 Embedded shaft part 5 Retaining collar part 6 Retaining collar part 7 Triangular locking rib piece

Claims (1)

[Scope of utility model registration request] 1. A single-shaft bolt main body in which a mounting shaft portion provided with a mounting screw at an upper end and a large-diameter embedded shaft portion are connected to each other is formed, and retaining collars are provided at upper and lower positions of the embedded shaft portion. An anchor bolt for construction, which is arranged in parallel and is formed by projecting a plurality of triangular anti-rotation rib pieces from the outer periphery of the lower portion of the embedded shaft portion toward the periphery of the retaining collar at the lower end.