JPS63201226A - Anchor bolt used in post-execution anchor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an anchor bolt used for a post-installed anchor.

[Conventional technology] Conventionally, when attaching an anchor bolt to an existing structure such as reinforced concrete, a two-component capsule-type fixing material is inserted into a hole drilled in the base material, and the embedded tip is cut diagonally. By mechanically rotating the anchor bolt and pushing it to the bottom of the hole, the fixing material is mixed and hardened.
A construction method is known in which an anchor bolt is fixed in a hole in a base material.

In this construction method, the embedded tip of the anchor bolt is processed into a convex shape by cutting diagonally on one side or diagonally on both sides in order to improve the mixing of the fixing material. , the right side view is shown in Figure 3(a).
(b) shows a front view and a right side view of the tip of the anchor bolt cut diagonally on both sides, and FIGS. 4(a) and (b) show a right side view.

[Problems to be Solved by the Invention] As mentioned above, in order to improve the mixing of the two-component fixing material, conventionally the embedded tip of the anchor bolt is processed into a convex shape by cutting diagonally or diagonally on both sides. However, there is a problem in that the adhesion strength of this diagonally machined part cannot be expected because the cut part is a mirror surface. This means that when cutting an anchor bolt at an angle of 45 degrees on one side, it is not possible to obtain the anchoring strength for a length corresponding to the diameter of the anchor bolt at the bottom of the hole. etc., it is clear.

The present invention solves the above problems and changes the shape of the tip that enters the hole of the anchor bolt, so that even if the same construction is performed as before, the tip has a convex shape, such as the conventional one-side diagonal cutting or both-side diagonal cutting. The purpose of the present invention is to provide an anchor bolt with stronger adhesion strength than that of the anchor bolt.

Means for Solving Problem E] In order to solve the above problems and achieve the object of the first invention, the anchor bolt used in the post-installed anchor according to the present invention is characterized by being configured as follows. In other words, the anchor bolt is used in a method of fixing the anchor bolt in the borehole by mixing and accelerating hardening of the two-component fixing material in the borehole by pushing the anchor bolt into the borehole while rotating. It is characterized by having a concave shape at the tip that enters the perforation.

[Example] The present invention will be explained in detail by the example shown in the drawings below.
FIG. 1 (a
)(b), and FIGS. 2(a) and 2(b) show a front view and a right side view of the tip of the second embodiment.

The first embodiment is an example of an anchor bolt in which the tip part is machined to have a concave shape inward at 45 degrees, and the second embodiment is an example of an anchor bolt in which the tip part is machined inward to form a spherical concave shape.0According to the present invention Anchor bolts used for post-installation anchors may have a concave distal end that enters the hole, and are not limited to the above-mentioned shape.

Among the above-mentioned shapes, the anchor bolt with a 45-degree diagonal cut on one side, which is the most common shape of conventional anchor bolts, and the anchor bolt of the first embodiment according to the present invention are modified to improve the anchoring strength by changing the embedding depth. A comparative test was conducted.

The results are shown in Table 1.

As is clear from Table 1, the average adhesion strength is 3.52) n for the conventional type and 4.15) n for the anchor pol D16 at a buried depth of 84 m, which is approximately 18% stronger. is a good result. In addition, the embedding depth is 80
In the case of the conventional type, the average adhesion strength is 4.77.
), the example was 5.28 tons, which is a good result of about 13% strength.

[Effects of the Invention] Since the anchor bolt used for the post-installed anchor according to the present invention is constructed as described above, it can be constructed in the same manner as before, and can be cut with a convex tip such as the conventional diagonal cutting on one side or diagonal cutting on both sides. This has the effect of providing stronger adhesion strength than shaped anchor bolts. This can increase the anchoring strength at the same depth compared to the conventional anchor bolt anchoring method. Therefore, it has a particularly effective effect when attaching an anchor bolt to a base material that is not very thick, such as a wall or floor.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are front views of the tip of a first embodiment of an anchor bolt used for a post-installed anchor according to the present invention;
The right side view, FIGS. 2(a) and 2(b) are the front view and right side view of the tip of the second embodiment, and FIGS. 3(a) and (b) are the front and right views of the tip of the conventional anchor bolt cut diagonally on one side. A front view, a right side view, and FIGS. 4(a) and 4(b) are a front view and a right side view of a conventional end portion of an anchor bolt cut diagonally on both sides. Agent Patent attorney Elementary 1) Osamu Parent Figure 1 Figure 2 (a) (b) (a) (b) Figure 3 Figure 4

Claims (1)

[Claims] An anchor bolt used in a method of fixing an anchor bolt in a hole by mixing and accelerating hardening of a two-component fixing material in the hole by pushing the anchor bolt into the hole while rotating. An anchor bolt used for post-installation anchors, characterized by a concave shaped tip that goes inside.