JP2001269916A - Anchor embedded in concrete and method of manufacturing concrete products using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an anchor embedded in concrete which is easily attachable to a mold and removable from it and a method of manufacturing concrete products using it. SOLUTION: The anchor contains a shaft 2 having a head 2b at the one end and a stopper 2c at the other and a hemispherical former 1 which has female screw grooves inside its rim and is fixed to the anchor shaft. A disc-like fitting 3 having a male screw at its edge and a bolt 33 at its center is screwed to the anchor and then to a mold. Concrete mortar is cast into he mold and, after it hardens, demolded to give concrete products with embedded anchor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anchor to be embedded at the time of molding a concrete molded product, such as a concrete panel or a block, to be manufactured at a factory, and a method of producing a molded product in which the anchor is embedded.

[0002]

BACKGROUND OF THE INVENTION It is known to embed lifting anchors which engage lifting equipment on the surface of concrete moldings. Conventionally, as shown in FIGS. 4 and 5, the former P1 is a rubber hemispherical body, into which a cut P11 is formed on the diameter passing through the top of the spherical surface and halfway to the bottom, and is split (opened). It is made possible. And this former is opened and pinched by the head of anchor P2,
It is attached to the template F with the bolts and nuts of the fixture P3.

Now, a specific working method will be described with reference to FIG. When embedding the anchor P2 on the side surface, a hole for passing the bolt of the former P1 is formed in the form F at the position where the anchor is to be embedded. The former P1 is opened, the head of the anchor P2 is inserted, the bolt is passed through the hole of the form F, the wing nut is screwed, and the anchor is fixed to the form F. After that, concrete is poured.
Next, when removing the mold, the wing nut is removed to remove the template F as shown in FIG. 7, and then the rod P4 is inserted into two holes provided on the bottom surface of the former P1 as shown in FIG. When these two rods are crossed, the former opens and detaches from the head of the anchor, and the former is removed.

[0004]

However, in such a method, when using a wide formwork, a worker having an anchor and a worker having a bolt are required on the outside and inside of the formwork, respectively. In addition, it is necessary to secure two people, and it is necessary to perform positioning between the formwork, which is an inefficient operation. Furthermore, since the bolts are removed once again when the mold is removed, for example, when forming a box-shaped molded product, it is necessary to enter the inside of the formwork. Moreover,
There is a problem that the inside is very narrow and it is impossible or very difficult for a worker to enter the inside of the inner mold.

An object of the present invention is to solve the above problems and to provide a concrete embedded anchor which can be easily attached to and detached from a mold, and a method of manufacturing a concrete molded product using the anchor.

[0006]

Means for Solving the Problems To solve the above problems, the configuration of the present invention is as follows. That is, the concrete embedded anchor of the first configuration is an anchor body having a head at one end of a shaft portion and a retaining portion at the other end, fixed to an intermediate portion of the anchor shaft portion, and having an internal thread near an end face. With a hemispherical shell former.

The concrete embedded anchor of the second configuration is
In addition to the first configuration, a cap having a male screw is detachably screwed to the female screw of the former.

[0008] A method of manufacturing a concrete molded product having a third configuration is characterized in that an anchor body having a head at one end of a shaft portion and a retaining portion at the other end is fixed to an intermediate portion of the anchor shaft portion, and an inner side near an end surface is provided. An anchor including a hemispherical shell-shaped former having an internal thread is used, an external thread is provided on the outer periphery of the disk member, and a screw rod is protruded from the center of the circular member. With the rod facing outward, screw it into the former and fix it, pre-fix a holder on the outer surface of the mold provided with a through hole, and attach the screw rod of the fixture fixed to the anchor. Inserting and screwing into a holder, connecting the anchor to the formwork, casting concrete, and removing the formwork after the concrete has hardened.

[0009]

Embodiments of the present invention will be described below with reference to an embodiment shown in the drawings. In FIG.
The embedded anchor A of the present invention includes a former 1, an anchor body 2, and a positioning member 5. Anchor body 2
Is a head 2b at one end of the shaft portion 2a and a retaining portion 2c at the other end.
have. Then, the fixture 3 is screwed into the former 1, and the threaded rod 33 is screwed into the holder (nut) 4 provided on the mold F, so that the anchor A is attached to the mold F.

A positioning member 5 is fixed to an intermediate portion of the anchor shaft 2a. The positioning member 5 is made of a short-cylindrical synthetic resin, and is integrally resin-molded together with the anchor shaft 2a. Then, the resin-molded hemispherical shell-shaped former 1 is positioned and fixed to the positioning member 5. The former 1 has a circular fitting hole 1a passing through the top of the spherical surface and concentric with the radius passing through the spherical center. The fitting hole 1a is slightly larger than the diameter of the head 2b. Thereby, the former 1 penetrates the anchor head 2b and is fixed to the positioning member 5 by press-fitting.
Further, inside the vicinity of the end face of the former 1, female threads 1b are provided over several (shown in FIG. 2) pitches.

The attachment 3 has a male screw 32 on the outer circumference of a metal disk member 31 and a metal screw rod 33 at the center of the circle.
Is projected by welding. The male screw 33 is provided over several (two) pitches.

Next, a method of manufacturing a concrete molded product using the anchor A will be described with reference to FIGS. First, as shown in FIG. 1, a holder (nut) 4 is fixed by welding to the outer surface of a mold F provided with a through hole F0 having a diameter larger than the diameter of the screw rod 33 of the fixture 3. . Next, the disk member 31 of the attachment 3 is screwed and fixed to the female screw 1b of the former with the screw bar 33 facing outward. Next, the anchor shaft 2a is grasped by hand, and the screw rod 33 of the fixture 3 fixed to the anchor A is inserted into the holder 4 through the through hole F0 of the mold F and screwed together, so that the anchor A is fixed to the mold F.
To be combined.

As described above, the end face of the former 1 is
The anchor A is attached to the formwork F by closely contacting the inner surface of the mold. Next, as shown in FIG. 2, side molds F2 and F3 are erected on the upper surface of the lower mold F1, and concrete is cast. When the concrete is hardened, first, the mold F2 is tilted and removed from the mold, and then, with the lower part of the mold F3 fixed, a lifting tool is hooked on the anchor head 2b, and the concrete molded product is inclined obliquely upward ( Arrow B) Lift.

At this time, a separating force is applied between the end of the former 1 on the concrete molded product side and the disk member 31 fixed to the formwork F side, and the former female screw 1b is deformed or partially damaged. . As a result, the fixture 3 remains in the formwork F, and the anchor body 2, the former 1, and the positioning member 5 remain in the concrete molded product.

As another embodiment, a holder (nut) 4 is fixed in advance to the outer surface of the mold F by welding, and the screw rod 33 of the fixture 3 is passed through the through hole F0 of the mold F. 4 and screwed together to fix the fixture 3 to the formwork F in advance. Then, the female screw 1b of the former of the anchor A is screwed into this, and the former is connected to the formwork F. In addition, mounting fixture 3
If the disk member 31 is made of a permanent magnet having a strong magnetic force, the screw rod 33, the through hole F0 of the mold F and the holder 4 can be omitted, and the position at which the anchor A is coupled to the mold F is arbitrarily determined. Can be

An outer disk C2 is integrally formed on a female screw 1b of the former 1 with a cap C (a disk C1 having a male screw fitted in the female screw 1b) as shown in FIG. The disk C2 has a size to cover the end surface of the former 1.) is detachably attached. This prevents rainwater and snow from accumulating and freezing. When the cap C is mounted on the former 1, when the cap C is put on the end face and pressed, the end face of the former is expanded by elastic deformation, and the male screw of the cap C fits into the female screw 1b of the former 1. When removing the cap C, insert a removal tool such as a screwdriver into the gap between the outer disk C2 and the former 1.

The present invention is not limited to the examples and embodiments described above, but includes various modifications without departing from the spirit and scope of the appended claims.

[0018]

When the anchor of the present invention is used, the anchor can be attached only from the outside without performing positioning from both inside and outside of the formwork, so that only one person is required for the attaching operation. Moreover, even when removing the mold, the mold and anchor can be easily separated simply by removing the mold or lifting the concrete molded product without removing the screws etc., greatly improving the work efficiency. Safety can be ensured.

Since the former has a hemispherical shell shape, the following advantages are obtained. That is, when a concrete molded product is lifted in a direction that bends the anchor shaft, a part of the load is borne by the former,
This leads to prevention of breakage of the anchor. Further, when the anchor is embedded in the side surface of the molded product, when the anchor is set on the upright formwork, the anchor body protrudes horizontally and long. Since the former is supported by the former while being in close contact with the formwork, the anchor main body is prevented from tilting during concrete casting, and the anchor is reliably positioned. Moreover, since the cap is removable on the former,
By installing the cap, it is possible to prevent freezing of rainwater, snow and the like that accumulate in the recess of the former.

Since a female screw which is substantially parallel to the end face is formed inside the vicinity of the end face of the former, elastic deformation at the end face of the former becomes easy. Further, a cap can be detachably attached to the female screw.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention.

FIG. 2 is an explanatory sectional view showing the order of installation and removal of a mold.

FIG. 3 is an exploded longitudinal sectional view showing another embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a prior art anchor.

FIG. 5 is a left side view of FIG.

FIG. 6 is an explanatory diagram of a work in the related art.

FIG. 7 is a work explanatory diagram of a conventional technique.

FIG. 8 is a work explanatory diagram of a conventional technique.

[Explanation of symbols]

 Reference Signs List A anchor C cap C1 disk C2 outer disk F Form 1 Frame 1 Former 1a Hole 1b Female screw 2 Anchor body 2a Shaft 2b Head 2c Detachment stopper 3 Mounting tool 31 Disk part 32 Male screw 33 Screw rod 4 Holder 5 Positioning Element

Claims (3)

[Claims] 1. An anchor body having a head at one end of a shaft portion and a retaining portion at the other end, a hemispherical shell-like former fixed to an intermediate portion of the anchor shaft portion and having an internal thread near an end face. A concrete embedded anchor comprising: 2. The concrete embedding anchor according to claim 1, wherein a cap having a male screw is detachably screwed to the female screw of the former. 3. An anchor body having a head at one end of a shaft portion and a retaining portion at the other end, and a hemispherical shell-like former fixed to an intermediate portion of the anchor shaft portion and having an internal thread near an end face. Using an anchor that includes a male screw on the outer periphery of the disk member, and a screw rod protruding from the center of the circle of the mounting member, with the disk member facing the disk member, Screw it into the former and fix it.
A holder is fixed in advance on the outer surface of the mold provided with the through-hole, and the screw bar of the fixture fixed to the anchor is inserted into the holder and screwed, so that the anchor is coupled to the mold. A method of manufacturing a concrete molded product, comprising: casting concrete, removing the mold after the concrete has hardened.