JPS6137846Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to structural improvement of a driving anchor bolt.

Generally, when fixing equipment to a concrete wall, a drive-in anchor is often used.
First, a conventional driving anchor bolt will be explained with reference to FIGS. 1 to 3.

In the figure, 1 is a concrete wall, 1a is a hole made in it, 2 is equipment placed on one side of the wall, and 2
a is a through hole provided in this, 3 is a threaded rod, 3
3b is a slit provided in a direction that traverses the fitting hole 3a and is orthogonal to each other;
4 is a conical plug, 4a is a small diameter end thereof, 4 is a fitting part formed from the fitting hole 3a side of the threaded rod 3;
b is a large diameter end, 5 is a flat washer, 6 is a spring washer, 7 is a nut screwed into the threaded rod 3, 8 is a concrete grain existing between the bottom of the hole 1a and the surface of the large diameter end 4b,
9 is a concrete grain existing between the hole 1a and the side surface of the plug 4.

That is, the threaded rod 3 is inserted into the hole 1a with the plug 4 temporarily fitted into the fitting hole 3a as shown in FIG. Then, the head of the threaded rod 3 is struck and the plug 4 comes into contact with the bottom of the hole 1a, and the plug 4 is fitted into the fitting hole 3a, and the fitting part 3 is wedged.
c is increased in diameter and fitted into the hole 1a. Then, the fitted threaded rod 3 is fitted into the through hole 2a, and the equipment 2 is attached to the wall 1 by the flat washer 5, spring washer 6, and nut 7.
Fixed.

However, in the hole 1a, concrete particles 8 and 9 remain in the hole 1a, which was drilled using a hammer drill etc., and accumulate in the state shown in FIG. This prevents the plug 4 from fitting into the fitting hole 3a. Therefore, there was a problem in that the diameter of the fitting portion 3c was not sufficiently increased, and the pulling strength of the threaded rod 3 was significantly reduced. In addition, the grains 8 make the hole 1a relatively shallow, reducing the pull-out strength of the threaded rod 3, and the amount of protrusion of the threaded rod 3 from the wall 1 also changes, impeding proper fixation of the instrument 2. There were flaws. Furthermore, if the bottom surface of the hole 1a is soft due to the fact that the material of the wall 1 is young, etc., even if the head of the threaded rod 3 is hit, the large diameter end 4b of the plug 4 will not reach the hole 1a.
By pushing down the bottom surface of the plug 4, the amount by which the plug 4 is fitted into the fitting hole 3a decreases, and the pull-out strength of the threaded rod 3 decreases. As described above, the conventional drive-in anchor bolt has the disadvantage that its performance is significantly reduced depending on the state of removal of the concrete grains 8 and 9 from the hole 1a and the strength of the wall 1.

This invention solves the above-mentioned drawbacks and aims to provide a driving anchor bolt that can obtain stable strength through simple work.

An embodiment of this invention will be described below with reference to FIGS. 4 and 5.

In the figure, the same reference numerals as in FIGS. 1 to 3 indicate corresponding parts, and 4c is a pedestal formed at the large diameter end 4b of the plug 4 and having approximately the same diameter as the outer diameter of the threaded rod 3. As shown, it is provided to protrude from the conical surface of the plug 4. 4d is a recess provided on the bottom surface of the pedestal 4, and 8 is a space formed by the hole 1a and the bottom surface of the pedestal 4c.

That is, when the threaded rod 3 with the plug 4 temporarily fitted into the fitting hole 3a is inserted into the hole 1a, the concrete grains in the hole 1a are pushed toward the bottom of the hole 1a by the pedestal 4c, and some of them are pushed into the recess 4d. Estimate to space 8 while entering. When the head of the threaded rod 3 is struck, the plug 4 is fitted into the fitting hole 3a, the diameter of the fitting portion 3c is increased, and the threaded rod 3 is fitted into the hole 1a. That is, by providing the plug 4 with the pedestal 4c, the concrete particles are pushed toward the bottom of the hole 1a, and the accumulation of concrete particles in the space on the side surface of the plug 4 can be prevented. Furthermore, the base 4c increases the bottom surface area of the plug 4 and reduces surface pressure, so that the threaded rod 3 can provide resistance against the plug 4 even if the bottom surface of the hole 1a is made of soft concrete. Furthermore, some of the concrete grains are stored in the recess 4d of the plug 4, and the gap between the bottom of the pedestal 4c and the bottom of the anchor hole 1a becomes smaller, so the insertion depth of the threaded rod 3 into the hole 1a becomes shallower due to the concrete grains. As I get older,
It is possible to eliminate the problem of reduced pull-out strength. In this way, even if concrete grains remain in the anchor hole 1a or the wall 1 is soft, stable anchor bolt pull-out strength performance can be obtained, and the labor required to remove concrete grains can be reduced. Although this embodiment shows the case where the threaded rod 3 is installed horizontally, it is clear that the same effect can be obtained even when the screw rod 3 is installed vertically.

Figure 6 shows another embodiment of this invention.
In the figure, the same symbols as in Figures 4 and 5 indicate corresponding parts,
3 is a threaded rod having a female thread, and 4 is a plug that is integrally formed with this rod and connected to the fitting hole 3a at a small diameter end 4a with a small wall thickness.

That is, when the threaded rod 3 is struck, the small diameter end 4a
The threaded rod 3 is broken and the plug 4 is fitted into the fitting hole 3a. In this embodiment as well, the pedestal 4
c. Since the recessed portion 4d is provided, although detailed explanation will be omitted, it is clear that the same effect as the embodiment shown in FIGS. 4 and 5 can be obtained.

As explained above, this invention has a pedestal protruding from the conical surface at the large diameter end of the cone of the plug that is fitted into the fitting hole of the threaded rod, and a concave portion is provided on the bottom of the pedestal. When fixing a threaded rod upright on a concrete wall to prevent defects caused by concrete grains in the hole in the wall, inhibition of plug insertion caused by the softness of the concrete, and shallow holes, it is important to consider the strength of the anchor bolt, etc. This is to prevent performance deterioration.

As a result, a stable and high-performance anchor bolt can be obtained, and the time required to remove concrete grains from the anchor hole can be reduced, thereby improving the efficiency of erection work.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a conventional driving anchor bolt in an upright state, Figure 2 is an exploded perspective view of the fitting part of Figure 1, and Figure 3 shows the anchor bolt in Figure 1 being inserted into the anchor hole. 4 is a diagram corresponding to FIG. 2 showing an embodiment of the driving anchor bolt according to this invention, and FIG. 5 is a diagram corresponding to the anchor bolt of FIG. 4. 3 is a view corresponding to FIG. 3, and FIG. 6 is a view corresponding to FIG. 5 showing another embodiment of the driving anchor bolt according to this invention. 3... Threaded rod, 3a... Fitting hole, 3b... Slit, 4... Plug, 4a... Small diameter end, 4b...
Large diameter end, 4c...pedestal, 4d...recess. In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Scope of utility model registration request] a threaded rod having a fitting hole opened in the end face at one end and a slit arranged to divide the peripheral edge of the fitting hole;
a conical body, and a pedestal provided at the large diameter end of the conical body, extending from the conical surface of the conical body, having a diameter corresponding to the outer diameter of the threaded rod, and having a concave portion on the bottom surface; and a plug whose end is fitted into the fitting hole to increase the diameter of the end of the threaded rod on the fitting hole side.