JPS624491B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a driving anchor that is fixed by making a hole in concrete, rock, metal, etc. and driving it into the hole.

BACKGROUND OF THE INVENTION It is widely known to use anchors that bite into hole walls to place wood, metal, or other materials on or off surfaces such as concrete. Conventionally, this type of anchor has a general structure in which a screw or wedge is used to push the tubular anchor body into the hole wall, and the anchor body has a split groove and at least two screws or wedges. Since it is made up of two parts, it has a large number of parts and a complex structure, which not only makes it difficult to provide at a low price, but also makes fixing work difficult, making it impossible to fix a large number of anchors efficiently in a short time. The dot was hot. There are also anchors made of a single piece, which must be inserted into a hole and the gap filled with cement mortar or the like.

In the present invention, diagonal notches are symmetrically provided on both sides of a round rod-shaped anchor body, and the distal end thereof is eccentric with respect to the proximal end, so that the anchor body and the eccentric part are connected to opposing surfaces of the hole wall. The structure is very simple as it is a single part, and it can be fixed efficiently by simply driving it into place.

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 show an anchor body 2 in the shape of a round steel bar having a flat plate-shaped head 1 at the base end.
V-shaped notches 3, 3 inclined with respect to the central axis A are symmetrically formed on both sides near the tip of the holder by press working, and the tip is pushed out obliquely toward the tip during press working. Center axis B
An eccentric portion 4 is formed eccentrically by _δ1 with respect to the central axis A of the anchor body 2.

In this embodiment configured in this way, the anchor body 2
And when the diameter of the eccentric part 4 is D ₁ , D ₁ ≦D ₂
<D ₁ + δ ₁ A hole 11 with a diameter D ₂ of 1 is bored in the concrete 12 and the plate member 13 stacked on the surface thereof, and the eccentric portion 4 at the tip is inserted into this hole 11 (see Fig. 5). When the anchor body 2 is inserted into the hole 11, the eccentric part 4 is pushed in the direction of the central axis of the anchor body 2, that is, in the radial direction, so that D ₂ −D ₁ =δ ₂ <δ Eccentricity δ equal to _1
2 , it advances through the hole 11 and the driving is completed. When the eccentric part 4 advances through the hole 11 due to this driving, the front surface 4a of the eccentric part 4 receives resistance from the hole wall, so a force is applied that returns the eccentric part 4 toward the proximal direction, thereby reducing the eccentricity δ ₂ . Increasing direction, i.e. central axis B
A force is generated toward the front face 4a perpendicular to the arrow P in FIG.
A pressing force is applied to the hole wall. Further, a reaction force of the pressing force is generated on the back surface 2a of the anchor body 2 as shown by the arrow Q, and this acts as a pressing force on the hole wall. Therefore, forces in opposite directions with respect to the central axes A and B are generated in the anchor body 2 and the eccentric portion 4 of the anchor driven into the hole 11, and these act as resistance forces against pulling out.

FIG. 7 shows two eccentric parts 4, which are sequentially eccentric in the same direction with respect to the central axis of the anchor body 2, by providing notches 3, 3 inclined in the same direction with an interval in the axial direction at the tip of the anchor body 2. 5 was formed.

FIG. 8 shows an anchor body 2 having a bolt rod 6 at its base end, with notches 3, 3 inclined in opposite directions at a distance in the axial direction, and an eccentric portion 4 formed in the middle part of the anchor body 2. be.

It goes without saying that the number, position, and eccentric direction of the eccentric parts 4 are not limited to those in the three embodiments described above, but the principle of biting and fixing them to the hole wall is the same in all of them.

Incidentally, the depth of the notches provided symmetrically on both sides, the inclination angle with respect to the central axis, and the amount of eccentricity are appropriately set so as not to break when driven or pulled out, and at the same time to generate a large elastic restoring force in the radial direction.

As described above, the present invention has symmetrical notches on both sides of a round rod-shaped anchor body that are inclined with respect to its central axis, and the distal end is eccentric to the proximal end. The structure is extremely simple, and the eccentric portion can be formed simply by making a notch by press working, so it can be provided at a low cost. By setting the diameter of the hole in concrete, etc. within an appropriate range, when the hole is hammered into the concrete, the eccentric part approaches the center axis of the anchor body, and at the same time a force is applied due to resistance that increases the eccentricity. This, in cooperation with the elastic restoring force, presses the eccentric part against the hole wall, and the reaction force presses the anchor body against the hole wall on the opposite side, whereby the anchor is pressed against the hole wall over its entire length inside the hole. The material bites into the material and generates a strong pull-out resistance.

Therefore, according to the present invention, construction is extremely simple as it is only necessary to simply drive a single part of the anchor, and a large number of anchors can be efficiently driven and firmly fixed in a short time, which is an excellent effect never seen before. .

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention, Fig. 2 is a right side view, Fig. 3 is a rear view, and Fig. 4 is Fig. 2
5 and 6 are enlarged partial side views showing the driving situation; and FIGS. 7 and 8 are side views showing different embodiments of the present invention. 2... Anchor body, 3... Notch, 4... Eccentric part.

Claims (1)

[Claims] 1. A driving anchor characterized in that cuts are formed symmetrically on both sides of a round rod-shaped anchor body, inclined with respect to the central axis, and the distal end thereof is eccentric with respect to the proximal end thereof.