JPH0762751A - Anchor bolt - Google Patents

Abstract

PURPOSE:To improve withstand load by forming an anchor bolt of which the diameter of a buried part in base material is larger than the diameter of the external threaded part projecting from the surface of base material. CONSTITUTION:An anchor bolt A is formed, which is constituted of the buried part 1 in base material such as concrete, a base rock, or a ALC plate and the external threaded part 2 projecting from the surface of base material. The diameter of the buried part 1 is formed larger than the diameter of the external threaded part projecting on the ground approximately by 65-90%. Consequently, the withstand load can be improved without changing the hole diameter of a device, a structure, or the like to be fixed by means of the anchor bolt.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to anchor bolts. More specifically, the present invention relates to an anchor bolt that can improve load resistance without changing specifications (such as a bolt hole diameter of a mounting plate) on a fixed object such as a device or a structure fixed by the anchor bolt.

[0002]

2. Description of the Related Art Conventionally, post-installation type anchor bolts are often used when equipment such as blowers and pumps are attached to the foundation or curtain walls are attached to the outer wall of a building. Has been done. This anchor bolt is attached to the base material such as the foundation or outer wall using a resin anchor (so-called chemical anchor) or a mechanical anchor, but the conventional anchor bolt is a portion embedded in the base material and the surface of the base material. It had the same diameter as the part protruding from.

By the way, the anchor bolts are usually selected in terms of thickness (diameter) and length in consideration of pulling load and shearing load in the design stage. It may be necessary to increase the size of the anchor bolts to improve the performance. However, regardless of the portion embedded in the base material, when the diameter of the portion protruding from the surface of the base material becomes larger than the design value, the portion related to the protruding portion is changed, for example, a bolt hole of a mounting plate of a device or the like. It is difficult to increase the size of the anchor bolt described above because it is necessary to increase the hole diameter.

In view of the above circumstances, it is an object of the present invention to provide an anchor bolt whose load resistance can be increased without affecting the specifications of other elements.

[0005]

The anchor bolt of the present invention is characterized in that the diameter of the portion embedded in the base material is larger than the diameter of the male screw portion protruding from the surface of the base material.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An anchor bolt of the present invention will be described below with reference to the accompanying drawings.

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

In FIG. 1, A is an anchor bolt according to an embodiment of the present invention. The anchor bolt projects from a portion 1 embedded in a base material such as concrete, rock, ALC plate and the surface of the base material. It is composed of a male screw part 2 that does. A male screw is formed on the outer periphery of the portion 1 to be embedded, and by forming the male screw, the adhesion strength of the anchor bolt can be increased.

When a resin anchor is used,
It is preferable that the tip portion of the anchor bolt A is obliquely cut to form the inclined surface 4. When the anchor bolt is driven by a rotary impact, the capsule 4 of the resin anchor and the filler in the capsule are sufficiently agitated and mixed by the inclined surface 4, and therefore the resin and the curing accelerator are aggregated. This is because the particles are mixed evenly and uniformly in the particle group, and the adhesive force is improved.

A feature of the present invention is that the diameter of the above-mentioned embedded portion is larger than the diameter of the male screw portion 2 protruding above the ground. By changing the diameter in this way, it is possible to increase the withstand load of the anchor bolt by increasing only the diameter of the embedded portion without changing the diameter of the ground portion. Since the diameter of the ground part has not been changed,
There is no need to change the bolt hole diameter of the device mounting plate or various specifications on the fixed object side such as the steel plate. The ratio of the diameter of the protruding portion 2 to the diameter of the embedded portion 1 is not particularly limited in the present invention, but is generally 0.65 to 0.90 as a standard, and the range of 0.75 to 0.88 is particularly preferable. preferable. The length of the protruding portion 2 is usually 50 to 100 mm, though it varies depending on how the bolts are attached (10
It may reach 0 to 200 mm). Further, the ratio of the length to the diameter of the embedded portion 1 is usually about 5 to 15 as a guide.

The anchor bolt of the present invention can be applied not only to resin anchors but also to mechanical anchors, but its application will be described below by taking it as an example.

First, a hole 6 having a predetermined depth and diameter is formed in the base material 5 using a drill or the like (see FIG. 2). After cleaning the inside of hole 6 with air or a brush,
The capsule 7 is inserted into the inside (see FIG. 3). Next, the anchor bolt A of the present invention is embedded in the hole 6 to a predetermined depth while applying a rotational impact with a drill or the like. After a lapse of a predetermined time, the resin is cured and the anchor bolt A is firmly fixed in the base material. In addition, when a rotational impact is applied, a washer is intervened in advance at the tip of the anchor bolt A so that two nuts are engaged with each other so as not to move, or a cap nut is fitted.

In addition to the rotational impact, there is also a type of capsule which is driven by a hammer or the like and inserted into the base material.

[0014]

EFFECTS OF THE INVENTION Since the anchor bolt of the present invention has the diameter of the portion embedded in the base material larger than the diameter of the portion projecting above the ground, the specifications of the fixed object side fixed by the anchor bolt The load capacity of the anchor bolt can be increased and safety can be further improved without making any changes.

[Brief description of drawings]

FIG. 1 is a side view illustrating an embodiment of an anchor bolt of the present invention.

FIG. 2 is an explanatory view of a construction state of the anchor bolt shown in FIG.

FIG. 3 is an explanatory view of a construction state of the anchor bolt shown in FIG.

FIG. 4 is an explanatory view of a construction state of the anchor bolt shown in FIG.

[Explanation of symbols]

 A Anchor bolt 1 Embedded part 2 Projected part

Claims (3)

[Claims] 1. An anchor bolt, wherein a diameter of a portion embedded in a base material is larger than a diameter of a male screw portion protruding from the surface of the base material. 2. An anchor bolt according to claim 1, wherein a male screw is formed on the outer periphery of the portion embedded in the base material. 3. The anchor bolt according to claim 1, wherein the ratio of the diameter of the male screw portion protruding from the surface of the base material to the diameter of the portion embedded in the base material is 0.65 to 0.90.