JPH0413284Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to an anchor fixing structure, and more particularly to an anchor fixing structure for fixing an anchor for fixing a partition to a concrete floor.

(Prior Art) A conventional fixing structure for this type of anchor is constructed as shown in FIG. 11. In other words, variant muscle 1
A tapered surface 3 that expands downward is formed near the lower end 2 of the
A collar 5 inserted from above was locked. A slit (not shown) extends from the lower end surface 6 of the collar 5 to approximately the center in the length direction.
In order to fix the anchor composed of the deformed reinforcement 1 and the collar 5 to the concrete floor 9, an anchor fixing hole 10 formed in the concrete floor 9 is required.
Insert the lower end 2 side of the deformed rebar 1 through which the collar 5 has been inserted, and in this state, insert the driving hype 12 shown in FIG. After the end face is brought into contact with the upper end face of the collar 5, the driving hype 12 is struck from the upper part with a hammer (not shown) to expand the lower part of the collar 5 along the tapered surface in the direction of arrow a, and this expansion is performed. Connect the opened part to the side wall 1 of the anchor fixing hole 10.
1 (not shown), and fixed the modified reinforcement 1 to the concrete floor 9.

Deformed reinforcement 1 fixed to this concrete floor 9
Partitions (not shown), etc. were fixed to the walls.

(Problems with the Prior Art) However, the tapered surface 3 of the deformed difference reinforcement 1 described above is formed by forging the vicinity of the lower end 2 of the deformed difference reinforcement 1, and the tapered surface 3 is formed during heating.
There was a problem with scale adhering to the top, which later caused rust. In addition, due to forging, it is not possible to form the taper angle α of the tapered surface 3 gently, and the taper angle α of the tapered surface 3 becomes steep, and scale is generated.
When the collar 5 is driven in according to No. 2, it is necessary to drive the collar 5 many times, resulting in a problem that the work is time-consuming.

Moreover, since this driving pipe 12 requires strength, it is necessary to use a special alloy using molybdenum or the like, and it is expensive.

(Means for solving the problem) The present invention includes a lower end head portion having a tapered surface that expands downward, and a lower end head portion located above the lower end head portion that abuts against the upper end surface of the collar to prevent the collar from coming off. a deformed reinforcing bar formed with a slit of a predetermined size extending upward in the length direction from the lower end surface; a cotter having a tapered surface expanding downward and press-fitted into the slit; A collar is provided in which a slit is formed in the horizontal direction, and a collar is located on the outer circumferential side of the irregularly shaped reinforcement between the head portion and the stepped portion, and the irregularly shaped difference is driven into the bottom of the fixing hole of the irregularly shaped reinforcement. The anchor fixing structure is characterized in that the thread, the cotter, and the collar are configured to be integrally fixed to the hole.

(Example) In FIG. 1 showing an example of the present invention, the lower end head portion 21 of the modified reinforcing bar 19 is formed to be slightly thicker (for example, 9 mm) than the diameter of the embedded portion 20 (for example, 8.5 mm). A tapered surface 22 (FIG. 2) is formed from the thick portion to the embedded portion 20. This lower end head portion 21 is formed at the same time as the deformed differential reinforcement 19 is rolled.
Unlike the case of forging, it is not heated afterwards and has a structure in which scale does not adhere.
A predetermined distance (for example, 46 mm) from this lower end head portion 21
mm) On the upper side, there are two protruding step portions 24 facing each other, for example.
Individually formed. Annular protrusions 25 are formed at approximately equal intervals on the outer circumferential surface of the deformed differential reinforcement 19 above the protruding step portion 24 to strengthen the connection with other members (for example, the concrete of the partition).
A slit 26 is formed from the lower end surface 23 of the deformed reinforcing bar 19 upward in the length direction to about the middle part of the embedded portion 20 in the length direction.

Into this slit 26 is inserted an upper thin-walled portion 42 of a cotter 40 shown in FIGS. 7 and 8. This cone 40 has a shape in which a tapered surface 41 is formed by cutting out a part of a substantially truncated cone, and the upper part of this tapered surface 41 is a thin part, for example, about 1 mm thick. 42, on the other hand, the lower part of the tapered surface 41 is a thick part 43 having a thickness of, for example, about 6 mm. A tapered surface 4 is formed between the thin part 42 and the thick part 43.
1, and support pieces 44 are formed on both sides of this tapered surface 41 to guide the lower end head portion 21 of the deformed differential reinforcement 19. An extended insertion part 45 is formed at the tip of the thin part 42 to have the same thickness as the tip of the thin part 42, and has a structure that allows stable insertion of the cotter 40 into the slit 26. There is.

A collar 27 is located between the lower end head portion 21 on the outer peripheral side of the deformed differential reinforcement 19 and the protruding step portion 24 (Fig. 1), and this collar 27 has a substantially cylindrical shape as shown in Fig. 4. A plurality of (for example, four) slits 29 extend from the lower end surface 28 to approximately the center in the length direction. Further, for example, three annular grooves 30 are formed on the lower outer peripheral surface of the collar 27. As shown in FIG. 6, the annular groove 30 has a triangular cross-sectional shape with a base C substantially perpendicular to the axial direction, and the lower part of the collar 27 digs into the side wall 35 of the fixing hole 34. Time (9th
), the collar 27 has a shape that makes it difficult to pull it out upwards. Also, near the lower end of the collar 27 is a thin section 31.
Therefore, even when the cotter 40 is inserted into the slit 26, the vicinity of the lower end of the collar 27 does not separate from the upper part of the lower end head 21 of the deformed difference bar 19, and closely follows the outer periphery of the lower end head 21. (Figure 5).

A fixing hole 34 is formed on the concrete floor 9 side to which the embedded portion 20, collar 27, and cotter 40 are fixed. This fixing hole 34 is formed using an ordinary drill, and its depth is set to correspond to the embedded portion 20.

Next, the operation will be explained. Insert the embedded part 20, collar 27, and lockter 40 assembled in the state shown in FIG. The lower end surface of is the bottom surface 36 of the fixing hole 34.
While in contact with the deformed rebar 19, the upper end of the deformed rebar 19 is directly struck from above with a hammer (not shown). The collar 27 is supported by the bottom surface 36 of the fixing hole 34, so it does not move downward, and the collar 27 is prevented from moving upward by the embedded part 20 and the protruding step part 24, as shown in FIG. It will move downward like this. As a result, Kotter 40
enters deeply into the slit 26 formed in the embedded portion 20, and both sides of the slit 26 of the lower end head portion 21 are expanded by the tapered surface 41, and this expanded lower end head portion 21 is inserted into the collar 27. The lower part of the collar 27 is expanded and the lower part of the collar 27 bites into the side wall 35 of the fixing hole 34. In addition, since the support piece 40 is generally formed into a truncated conical shape that becomes wider as it goes downward, the support piece 4
The lower part of the collar 27 is also expanded directly by the four-way portion without going through the lower end head part 21, and the collar 27
The lower part of the tapered surface 41 also bites into the side wall 35 at a portion not facing the tapered surface 41. Furthermore, the lower end head portion 21 expanded by the collar 40 also bites directly into the side wall 35, and is fixed to the side wall 35 by both the lower portion of the collar 27 and the lower end head portion 21.
It is done in stages.

Since the lower part of the collar 27 is a thin wall portion 31, even if the lower end head portion 21 is expanded by the cockter 40, the thin wall portion 31 will not spread outward, and as shown in FIG. Head part 21
The state along the upper outer periphery is maintained. Through the above operations, the embedded part 20, the collar 27, and the protector 40 are integrated, and the integrated components of the embedded part 20, collar 27, and protector 40 are firmly fixed in the fixing hole 34. It will be done.

In the above-mentioned embodiment, a long rod portion is integrally formed above the embedded portion 20 as the modified reinforcing bar 19, but in another embodiment, only the embedded portion 20 is formed. It may be formed as a separate body, and the embedded portion 20 may be integrated with the upper rod portion by means such as welding or screwing.

(Effects of the invention) In the anchor fixing structure according to the present invention, the member constituting the conventional tapered surface is formed by the cotter 40, and the cotter 40 is made of a different member from the deformed differential reinforcement 19, and is more loose. It is possible to form a slightly tapered surface, and by making the taper angle of this tapered surface 41 gentler, it is possible to easily insert the slit 40 into the slit 26. Therefore, the conventional method of hammering the collar into a predetermined position, which required about five times, can now be driven in about one time, thereby greatly speeding up the work of fixing the anchor.

Furthermore, the upper part of the deformed reinforcing bar 19 can be struck with a straight hammer, making it unnecessary to use the expensive driving pipe 12.

Furthermore, since the fixing to the side wall 35 is performed not only by the collar 27 but also by the lower end head part 21 itself expanded by the connector 40, it is fixed in two stages, and the fixing hole 34 of the deformed differential bar 19 is fixed. The fixation can be made even more stable and strong, and problems such as looseness during fixation can be eliminated. That is, in FIG. 10, which shows the relationship between displacement and load, the conventional curve E can be improved to curve F according to the present invention, and its rise characteristics can be made extremely good.

[Brief explanation of the drawing]

FIG. 1 is a partially omitted vertical sectional side view showing an embodiment of the present invention, FIG. 2 is an enlarged view of part A in FIG. 1,
Fig. 3 is a partially omitted perspective view of the modified reinforcement, Fig. 4 is a perspective view of the collar, Fig. 5 is a partial sectional view of the collar, Fig. 6 is an enlarged sectional view of part B in Fig. 5, and Fig. 7
The figure is a perspective view of the cotter, Figure 8 is a cross-sectional view of Figure 7, Figure 9 is a partially omitted vertical side view showing the state in which the modified reinforcement is driven, and Figure 10 is a diagram showing the relationship between displacement and load. A graph showing the relationship, and FIG. 11 is a partially omitted vertical sectional side view showing a conventional example. 19... Deformed difference bar, 21... Lower end head part, 2
2...Tapered surface, 24...Protruding stepped portion, 26...
...Slit, 27...Collar, 29...Slit, 31...Thin wall portion, 34...Fixing hole, 40...
...Cottater, 41...Tapered surface.

Claims (1)

[Claims for Utility Model Registration] (1) A lower end head portion having a tapered surface that expands downward, and a step located above the lower end head portion that comes into contact with the upper end surface of the collar to prevent the collar from coming off. a deformed reinforcing bar formed with a slit of a predetermined size extending upwardly in the longitudinal direction from the lower end surface; a cotter having a tapered surface that expands downward and press-fitted into the slit; A slit is formed in the deformed rebar, and a collar located on the outer peripheral side of the deformed rebar between the head portion and the stepped portion, and by driving the deformed rebar into the bottom of the fixing hole, the deformed rebar, An anchor fixing structure, characterized in that the cotter and the collar are configured to be integrally fixed in the hole. (2) The anchor fixing structure according to claim 1, wherein the lower end portion of the collar is thinner than the upper portion.