JP3248089B2 - Concrete insert equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete insert device which is embedded when molding a concrete molded product such as a concrete panel or a block, which is manufactured in a factory. This is suitable when the direction is perpendicular to the direction.

[0002]

2. Description of the Related Art It is well known to embed concrete inserts on the surface of concrete moldings to attach bolts for the purpose of mounting or interconnecting to a building body at the time of construction or mounting of lifting equipment.

[0003] When manufacturing molded articles such as various concrete panels and blocks in a factory, an insert is temporarily mounted at a predetermined location on an inner surface of a formwork, concrete is poured, and the insert is left on the concrete when the form is removed from the mold. Thereby, a molded product in which an insert is buried at a predetermined location can be easily mass-produced.

[0004] Conventionally, as shown in FIG.
0, the insert 51 is directly connected with a bolt 55, and after the concrete 60 is cast, the bolt 55 is removed and the mold 6 is removed.
The method of demolding 0 was common.

[0005] Alternatively, when the direction of mold release corresponds to the axial direction of the insert, as shown in FIG.
Attach the spacer 52 to the base end side of the insert body 51,
A method of temporarily attaching the insert 51 to the formwork 50 by press-fitting the plug 53 into the spacer 52, casting concrete 60, and then pulling out the plug 53 together with the formwork 50 to remove the mold is also conventionally used.

However, as shown in FIG. 5, for example, when manufacturing a concrete molded product 15 having a box-shaped structure, an outer mold frame 13 is arranged around an inner mold frame 10 (a) (FIG. 5B), and between them, After the concrete is poured into the concrete form (c), the outer mold 13 is first removed from the mold (d), and then the concrete molded product 15 is formed.
Is lifted (e) to release the inner mold 10. When an insert is installed on the surface of the concrete molded product 15 on the side of the inner mold 10, the horizontal surface of the concrete molded product 15 is removed along the axial direction of the insert, as shown in FIG. An insert device using the spacer 52 can be used, but the side surface of the inner mold 10
, Ie, in the direction perpendicular to the axis of the insert, the insert mounted and held on the inner mold 10 must be separated from the inner mold 10 prior to movement. Therefore, the spacer 52 shown in FIG.
In the past, bolts were screwed into the screw holes of the insert and fixed to the inner mold as shown in FIG.
When removing the mold, the molded product was lifted after removing the bolt.

However, in such a method, a worker having an insert and a worker having a bolt are required on the outside and inside of the inner form when installing the inner form, and two people must be secured. In addition, the positioning must be performed with the inner mold frame interposed therebetween, which is an inefficient operation. Furthermore, when the mold is released, the bolt must be inserted into the inner mold to remove the bolt again. In addition, 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.

[0008]

The problem to be solved by the present invention is that when an insert is installed on a surface of a concrete molded product in contact with the inner mold at right angles to the demolding direction, a bolt is screwed into a screw hole of the insert. In the method of stopping and fixing to the inner mold, removing the bolts when removing the mold, and lifting the molded product, the work is inefficient and dangerous, and the inside is very narrow, In some cases it is impossible or difficult to get inside.

[0009]

SUMMARY OF THE INVENTION Accordingly, the present invention provides an insert main body; an attachment portion in which the insert main body is projected forward and a base end portion thereof is fixed to a front portion; A cylindrical wall portion having a smaller diameter than the mounting portion, a male screw shorter than one pitch formed near the base end of the cylindrical wall portion, and a thin section formed at a distal end of the cylindrical wall portion that contacts the mounting portion. A fitting having an easily breakable portion; an inner hole into which the cylindrical wall portion is inserted, and an internal thread formed in the internal hole and shorter than one pitch that engages with the external thread;
And a holder fixed to the outer side surface of the mold so that the inner hole communicates with the inside of the mold, thereby providing a first means for solving the above problem.

An insert main body; a cylindrical wall formed integrally with the insert main body and extending from the base end face in a proximal direction, and having a diameter smaller than that of the insert main body; and one formed near the base end of the cylindrical wall part. A fixture having an external thread shorter than a pitch, an easily breakable portion formed of a thin cross-section formed at the tip of the cylindrical wall portion which is in contact with the insert body; an inner hole into which the cylindrical wall portion is inserted; An internal thread formed in the hole and shorter than one pitch engaging the external thread,
And a holder fixed to the outside surface of the mold by connecting the inner hole to the inside of the mold, thereby providing a second means for solving the above problem.

[0011]

The holder is fixed to the mold by aligning the through hole of the inner mold with the inner hole of the holder, and the cylindrical wall portion of the mounting having the insert body at the distal end is formed in the holder inner hole. And the male screw is screwed into the female screw to place the insert in place. After installing the inner formwork to which the insert is attached, install the outer formwork and cast concrete.

Next, when the concrete is hardened, the outer mold is first released from the mold in a normal manner, and then the concrete molded product is lifted. Since the base end side is separated from the concrete molded product together with the inner formwork, only the insert body is left in the concrete molded product.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG.

The insert device 1 according to the present invention comprises an insert body 2, a fixture 3, and a holder 4.

The insert body 2 is the same as that conventionally used as an insert, and comprises a female screw hole 21 for screwing a bolt and a flange 22 for preventing removal.

The mounting member 3 has a mounting portion 31 having a mounting hole 36 at a distal end side for tightly fitting and fixing a base end portion of the insert body 2 and a cylindrical wall portion having a diameter smaller than that of the mounting portion 31 extending forward. An external thread 33 having a pitch shorter than one pitch is provided near the base end face of the cylindrical wall section 32, and the thin section is formed at one place which is the same as or about a few millimeters forward of the base end face of the mounting section 31. It is provided on the circumference and is an easily breakable portion 34. The inner hole 35 passes through the inside of the fixture 3 on the center axis, and has a diameter slightly larger than the root diameter of the female screw 21 of the insert body 2. The material of the fixture 3 may be a synthetic resin or a metal, but is preferably a synthetic resin in consideration of the fact that it is easily broken at the easily breakable portion 34.

The holding member 4 is formed in a short cylindrical body, and its inner hole 41 is slightly larger in diameter than the thread diameter of the male screw 33 of the mounting member 3, and is formed with a pitch so as to engage with the male screw 33. Also has a short internal thread 42. And this holder 4
The material may be either synthetic resin or metal. However, the material may be used for durability when used repeatedly, or as shown in FIG.
Considering that it is fixed by welding, metal is preferred.

Next, a method of using this embodiment will be described with reference to FIGS.

The insert device of the present embodiment is used, for example, in the case of manufacturing a box-shaped concrete molded product, of a concrete molded product produced by casting concrete between an inner mold frame and an outer mold frame. This is suitable for the case where an insert is installed on a surface that is in contact with a formwork.

First, as shown in FIG.
The holder 4 is fixed by welding or the like to the outer surface of the inner mold 10 in which the through hole 11 having a diameter larger than the thread diameter of the male screw 33 is provided at a predetermined insert position. Then, insert body 2
The fitting 3 is tightly fixed to the fitting 3, the cylindrical wall portion 32 of the fitting 3 is inserted into the inner hole 41 of the holder 4 through the through hole 11 of the inner mold 10, and the male screw 33 and the female screw 42 are screwed together. Each screw is shorter than one pitch, so after inserting,
It can be easily screwed together with just a slight turn.

Then, the fixture 3 that projects and holds the insert body 2 forward is connected to the holder 4, and the base end surface of the attachment portion 31 is brought into close contact with the inner surface of the inner mold 10 to close the through hole 11. After the inner mold 10 is installed, the outer mold 13 is installed as shown in FIG. 5, and concrete is poured. When the concrete has hardened, the outer mold 13 is first released from the mold by a conventional method, and then the concrete molded product 15 is lifted while the lower part of the inner mold 10 is fixed. Then, a shearing force is applied between the mounting portion 31 that is lifted integrally with the concrete molded product 15 and the cylindrical wall portion 32 that is left integrally with the inner mold 10, and easily breaks at the easily breakable portion 34. As shown in 2 (B), the concrete molded product 1
5 and the mounting portion 31 of the insert body 2 and the mounting fixture 3
Is removed from the inner mold 10, and the insert body 2 is installed in the concrete molded product 15.

Since the cylindrical wall portion 32 of the attachment 3 remaining in the inner hole 41 of the holder 4 is screwed with a screw shorter than one pitch, it can be easily removed and the inner frame is formed. 10
And the holder 4 can be used repeatedly.

FIG. 3 shows a different embodiment of the present invention, in which the same insert body 2 as in FIG. 1 and a fixture 3 having a cylindrical wall portion 32 without a mount portion are integrally formed. It is. The portion where the base end of the insert main body 2 and the fixture 3 are in contact with each other is an easily breakable portion 34 having a thin cross section.
The cylindrical wall portion 32 has an external thread 33 shorter than one pitch near the base end face, and the diameter of the inner hole 35 is larger than the root diameter of the internal thread 21 of the insert body 2. The method of use is exactly the same as that of the embodiment of FIG. 1, and the holder 4 can be the same as that of FIG.
Is preferably larger than the through hole 11 of the mold 10.

FIG. 4 shows a different embodiment of the holder of the present invention.

FIG. 4A shows a male screw 43 provided on the outer periphery of one end of the cylindrical holder 4. The female screw 12 provided on the mold 10 and the male screw 43 are screwed together. In addition, a step portion 45 at the boundary between the male screw 43 and the cylindrical portion 44 having a diameter larger than the crest diameter is brought into contact with the mold 10 and fixed.
The inner hole 41 has a slightly larger diameter than the diameter of the male screw 33 of the mounting fixture 3, and has a female screw 42 shorter than one pitch that engages with the male screw 33.

FIG. 4B shows the entire outer periphery of the cylindrical holder 4 forming a male screw 43. The configurations of the inner hole 41 and the female screw 42 are the same as those in FIG. 4A. . Then, the inner hole 41 of the holder 4 to which the nut 5 is attached and the mold 1
The nut 5 is fixed to the formwork 10 by welding with the position of the through-hole 11.

In the embodiment described above, of the insert body 2 and the fixture 3 in FIGS. 1 and 3 and the holder 4 in FIG. Any combination may be used as long as it is one set.

Since the easily breakable portion 34 can be broken not only by shearing but also by pulling, the present invention can be applied to a case where the mold is moved obliquely or axially with respect to the axis of the insert to remove the mold. it can.

[0029]

According to the insert apparatus of the present invention, the insert can be mounted only from the outside without performing positioning from both inside and outside of the formwork, so that only one person is required for the mounting work. .

In addition, when removing the mold, the mold and the insert can be easily separated from each other simply by lifting the concrete molded product without removing the screws and the like, so that the work efficiency is greatly improved and safety is secured. it can.

Also, since the fixture and the holder are only connected by screws shorter than one pitch, the insert can be easily attached in a short time when the insert is installed, and the remaining portion of the fixture in the holder is removed. After the mold is released, it can be easily removed, and the mold and the holder can be reused.

Further, the use of the fixture having the attachment portion according to the first aspect has an effect of preventing concrete from flowing into the female screw hole of the insert at the time of placing concrete. Even if the tip of the fixture is left after the mold is removed, the inner hole of the fixture is larger than the internal thread root diameter of the insert, so that it does not hinder the bolt from being attached to the insert.

Further, when the insert body and the mounting member are integrally formed as described in claim 2, the structure and the labor of mounting are further simplified.

In addition, if the fixture is made of synthetic resin,
Breaking at the easily breakable portion is further facilitated and a large force is not required.

Further, if the holding member is made of metal, deformation or the like does not occur even in repeated use, which is advantageous in terms of durability.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing a use state of the embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a different embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing another embodiment of the holder of the present invention.

FIG. 5 is an explanatory sectional view showing the order of installation and removal of a mold.

FIG. 6 is a longitudinal sectional view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insert apparatus 2 Insert main body 3 Mounting tool 4 Holder 10 Formwork 31 Mounting part 32 Cylindrical wall part 33 Male screw 34 Easily breakable part 41 Inner hole 42 Female screw

Claims (5)

(57) [Claims] 1. An insert main body; a mounting portion in which the insert main body is protruded forward and a base end portion thereof is fixed to a front portion; and a cylindrical wall portion having a smaller diameter than the mounting portion extending in a base end direction from the mounting portion. A fitting having an external thread shorter than one pitch formed near the base end of the cylindrical wall portion, and an easily breakable portion having a thin section formed at a distal end of the cylindrical wall portion which is in contact with the mounting portion. An inner hole into which the cylindrical wall portion is inserted, and a female screw formed in the inner hole and engaging with the male screw and shorter than one pitch, and communicating the inner hole to the inside of the mold with the outer surface of the mold. And a fixture fixed and fixed thereto. 2. An insert main body; a cylindrical wall formed integrally with the insert main body and extending in a proximal direction from a base end surface, and having a smaller diameter than the insert main body; and one formed near the base end of the cylindrical wall portion. A fixture having an external thread shorter than a pitch, an easily breakable portion formed of a thin cross-section formed at the tip of the cylindrical wall portion which is in contact with the insert body; an inner hole into which the cylindrical wall portion is inserted; And a female screw formed in the hole and having a female thread shorter than one pitch that engages with the male screw, and a retainer fixed to the outer surface of the form by communicating the inner hole to the inside of the form. apparatus. 3. The concrete insert device according to claim 1, wherein the fixture is formed of a synthetic resin. 4. The concrete insert device according to claim 2, wherein the insert body and the fixture integrated therewith are formed of synthetic resin. 5. The concrete insert device according to claim 1, wherein the holder is formed of metal.