JP3493353B2 - Retaining insert - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding insert.

[0002]

2. Description of the Related Art Retaining inserts for holding long bolts or hanging bolts on a concrete structure after construction, such as a concrete wall or a ceiling, are pre-installed on the inside of a formwork before concrete placing, and It is to be embedded in concrete after construction. As the insert, a conventional so-called ceramic insert is composed of an insert body and a fixing bolt. The insert body has a screw hole formed in the axial center thereof, and the fixing bolt is screwed into the screw hole. The construction procedure of this ceramic insert will be described. First of all, one of the two workers goes inside the formwork, holds the insert body, aligns the tip of the insert body with the insert support hole that is pre-drilled in the formwork, and the other one is outside the formwork. The worker holds the fixing bolt, inserts it into the insert support hole, and screws it into the screw hole of the insert body to fix the insert body to the inner surface of the mold. After the ceramic insert is cantilevered inside the formwork, concrete is poured into the formwork, and after the concrete hardens, the fixing bolts are removed and the formwork is removed. For example, scaffolding support bolts or ceiling suspension bolts are screwed into the insert body embedded in concrete.

[0003]

According to the conventional insert, two workers are always required at the time of construction, so that the worker can be efficiently arranged and the installation work can be speeded up as compared with the case of working alone. There was room for improvement. An object of the present invention is to improve the efficiency of the arrangement of workers and the speed of installation work.

[0004]

A first feature of the present invention is that it comprises an insert body and a holder that can be inserted into and removed from a support hole of a mold, and the insert body is mounted in the axial direction. A hole is provided, and an internal thread portion is formed on the inner periphery of the mounting hole, the holder is removably inserted into the mounting hole, and an external thread portion that can be coupled to the female thread portion is formed on the outer periphery thereof. A stopper is provided at the end protruding from the mounting hole, and the stopper is capable of penetrating the support hole of the mold from the inner surface side of the mold to the outer surface side,
The holder can be held on the mold by the outer surface of the mold.
A second feature of the present invention is, on the premise of the first feature, that the stopper is elastically deformable and that the rear portion thereof can be joined to the outer surface of the mold. A third feature of the present invention is based on the first feature, wherein the stopper is composed of a plurality of elastically deformable stopper pieces, and each stopper piece gradually extends from the axial center of the projecting end portion from the front end to the rear end. It is inclined in a direction away from it, and the rear end portion of the stopper piece can be joined to the outer surface of the mold. A fourth feature of the present invention is that, on the premise of the first, second or third feature, an operation portion for taking out the holder is provided at the tip end portion of the protruding end portion.

[0005]

[Operation] When the insert main body and the holder are combined and the projecting end portion of the holder is passed through the support hole of the form, the stopper is projected to the outer surface of the form, and the stopper supports the holder on the form and concrete placing Remove the holder from the insert body later.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The holding insert shown in FIG. 1 comprises an insert body 1 and a holder 2 and is attached to a mold K in a horizontal state through a support hole Ka formed in the mold. 1 to 3, the insert body 1 is made of ceramic and has a mounting hole 3 at the axial center. A female screw portion 3a is formed at the rear end (right end in FIG. 1) of the mounting hole 3. The tip surface of the insert body 1 contacts the inner surface of the mold K during mounting. 4 to 8,
The holder 2 is formed in a rod shape by a plastic member, and a male screw portion 4 is formed on the outer periphery of the rear end (right end in FIG. 4). Further, a stopper 5 is provided on the end portion 2a on the tip end side of the holder 2. The stopper 5 is composed of a pair of stopper pieces 5a that are elastically deformable in the illustrated example. The stopper pieces 5a are in a facing positional relationship, and are inclined from the front end to the rear end in a direction gradually away from the axis of the end portion 2a.
The rear end of the stopper piece 5a can come into contact with the outer surface of the form K as shown in FIG. The tip of the holder 2 is provided with a nut portion 6 which is an operation portion for taking out a bolt. In the example shown in FIG. 8, the nut portion 6 is formed in a hexagonal nut shape, and a hexagonal wrench L (FIG. 9) can be inserted therein, and an operation hole 6a having a hexagonal internal shape is formed. The relationship among the holder 2, the insert body 1, and the mold K will be described with reference to FIGS. The holder 2 is inserted into the mounting hole 3 of the insert body 1. Holder 2
The male screw portion 4 at the rear end is the female screw portion 3a of the insert body 1.
Is combined with. The tip side of the holder 2 is the insert body 1
Is protruded from the tip of the stopper, and the stopper 5 is attached to the protruding end 2a.
Are formed. The holder 2 as a whole has a support hole Ka of the form K.
Can be inserted and removed. The stopper 5 is a support hole K of the form K.
It is possible to penetrate a from the inner surface of the mold to the outer surface side. In the state shown in FIG. 1 in which the protruding end portion 2a of the holder 2 is inserted into the support hole Ka, the stopper piece 5a has a mold K on the outer periphery of the support hole.
It is in contact with the outer surface of the insert body 1 and supports the insert body 1 via the holder 2. In the holder 2 inserted in the insert body 1, the stopper piece 5a is in contact with the outer surface of the mold K, so that the holder is prevented from coming off from the support hole Ka to the inner surface of the mold.

Next, a construction method will be described. First, FIG.
As shown in (A), the holding insert in which the holder 2 is attached to the insert body 1 is horizontally moved in the arrow direction from the inside of the mold K and inserted into the support hole Ka. Stopper 5
In the process of passing through the support hole Ka, the stopper piece 5a hits the inner peripheral surface of the support hole and elastically deforms and bends inward. Stopper 5
When the whole passes through the support hole Ka, as shown in FIG.
At the same time that the stopper piece 5a returns to its original position, the tip surface of the insert body 1 contacts the outer surface of the mold K. At this stage,
The insert body 1 is cantileveredly fixed and held on the mold by the holder 2 in the support hole Ka and the stopper piece 5a that is in contact with the outer surface of the mold K. Thereafter, as shown in FIG. 9 (B), concrete C is placed in the form K. After the concrete is hardened, as shown in FIG. 9C, for example, by inserting the tip of the hexagon wrench L into the operation hole 6a (FIG. 8) and rotating the hexagon wrench L, the holder 2 gradually moves to the left in the figure. After a while, it is completely taken out of the mold K through the support hole Ka. Finally, the mold K is removed.

In the above example, the retaining insert can be attached to the mold with only one touch by inserting the protruding end 2a of the holder 2 into the support hole Ka of the mold K, and after embedding the retaining insert. Since the holder insert can be installed simply by removing the holder from the insert body 1, the installation can be done quickly, and since only one worker can perform the installation, another worker who was originally required It becomes possible to perform another work, the efficiency of the arrangement of the workers can be improved, and the restriction at the time of construction associated with securing the workers can be released.

The material and shape of the insert body 1 and the holder 2 are not particularly limited as long as the functions can be exhibited. The stopper 5 is not limited to the one shown in the figure, and the stopper piece 5a may be a single piece or three or more pieces. If the stopper 5 is composed of a plurality of stopper pieces, since the structure is simple and elastic deformation is easy, the insertion operation into the support hole Ka becomes easy.
Of course, the stopper 5 is, for example, a mushroom-shaped one, a mat-shaped one or the like, and can smoothly penetrate the support hole Ka,
The structure is not limited as long as it can support the holder 2. The female screw portion 3a may be formed over the entire length of the mounting hole 3 and is not limited to that shown in FIG. The male screw portion 4 may also be provided on the entire length of the holder 2.

[0010]

According to the present invention, the operation of inserting the holder into the support hole of the formwork and the operation of removing the holder from the support hole can be easily performed by one worker, so that the worker can be efficiently arranged and the mounting work can be performed. Is accelerated.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a usage state of a holding insert according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a front view of a holder in the holding insert according to the present invention.

5 is a sectional view taken along line VV of FIG.

FIG. 6 is a plan view of the tip end side of the holder in the holding insert according to the present invention.

FIG. 7 is an enlarged end view taken along the line VII-VII in FIG.

8 is an enlarged end view taken along the line VIII-VIII in FIG.

FIG. 9 is a process diagram showing a stepwise construction procedure of a holding insert.

[Explanation of symbols]

1 insert body 2 holder 2a protruding end 3 mounting hole 3a female thread 4 male thread 5 stopper 5a stopper piece 6 nut part (operation part for holder removal) K frame Ka support hole

Claims (5)

(57) [Claims] 1. An insert main body and a holder that can be inserted into and removed from a support hole of a mold, and the insert main body is provided with a mounting hole in the axial direction, and an internal thread portion is formed on the inner periphery of the mounting hole. The holder is removably inserted into the mounting hole, a male screw portion that can be coupled to the female screw portion is formed on the outer periphery of the holder, and a stopper is provided at the end protruding from the mounting hole. The stopper is capable of penetrating the support hole of the mold from the inner surface of the mold to the outer surface thereof, and the holder can be held on the mold by the outer surface of the mold. insert. 2. The holding insert according to claim 1, wherein the stopper is elastically deformable, and the rear portion of the stopper can be joined to the outer surface of the mold. 3. The stopper is composed of a plurality of elastically deformable stopper pieces, each stopper piece is inclined from the tip end to the rear end in a direction away from the axial center of the protruding end portion, and The holding insert according to claim 1, wherein the rear end portion can be joined to the outer surface of the formwork. 4. The operation unit for taking out the holder is provided at the tip of the protruding end.
Alternatively, the holding insert according to claim 3. 5. An insert main body and a rod-shaped plastic holder that can be inserted into and removed from a support hole of a mold, and the insert main body is provided with an attachment hole in the axial direction, and the inner periphery of the attachment hole is formed. A female screw portion is formed in the holder, the holder is removably inserted into the mounting hole, and a male screw portion that can be coupled to the female screw portion is formed on the outer periphery of the holder, and a protruding end portion from the mounting hole is formed. A stopper consisting of a plurality of elastically deformable stopper pieces is provided in the stopper.The stopper is capable of penetrating the support hole of the mold from the inner surface of the mold to the outer surface thereof, and the holder is mounted on the outer surface of the mold. It can be held in the formwork,
Each stopper piece is inclined from the tip to the rear end in a direction that gradually separates from the axis of the projecting end, and the rear end of the stopper piece can be joined to the outer surface of the formwork by holding. Insert.