JPH0137210Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to an improvement of a holder for fixing a metal insert.

<Prior Art> A fixing holder used to attach an insert to a concrete formwork is a cylindrical body into which the insert is inserted. On the other hand, unlike wooden formwork, metal formwork is used many times, so after use, the holder must be removed and the mounting holes in the holder filled in for repair, so it is desirable that the mounting holes be as small as possible. However, since the conventional holder is a cylindrical body into which the insert is inserted as described above, its diameter must be large to some extent, and the hole for attaching it to the formwork has the disadvantage of having an even larger diameter.

<Problems to be solved by the invention and means thereof> The present invention aims to solve the above-mentioned drawbacks and provide a holder for fixing metal inserts in which the diameter of the mounting hole drilled into the formwork is as small as possible. It is configured as follows.

In other words, it consists of an insertion part that screws into the threaded part at the open end of a metal insert, a flange part with a larger diameter, and a foamed plastic body with a through hole in the center longitudinal direction for passing a metal fixing bolt. In the holder for fixing the insert, the insertion part has a slightly larger diameter than the inner diameter of the threaded part at the open end of the metal insert, and the inner diameter of the through hole has a slightly smaller diameter than the outer diameter of the metal fixing bolt. It is a fixed holder.

<Operation> When the insertion part made of foamed plastic is screwed into the threaded part at the open end of the metal insert, the diameter of the inserted part is slightly larger than the inner diameter of the threaded part at the open end.
A female thread is cut on the outer periphery of the insertion portion and the two are screwed together, so that the holder is fixed to the insert. Furthermore, if a metal fixing bolt is screwed into the through hole of the holder, the bolt will have a slightly larger diameter than the inside diameter of the through hole, and since the holder is made of foamed plastic, a female thread will be cut on the inside circumference of the through hole. The two are screwed together. Therefore, by screwing this fixing bolt into the holder through a mounting hole drilled at a predetermined position in the formwork, the metal insert can be fixed to the predetermined position in the formwork through the holder.

<Example> Examples will be described below based on the drawings. It consists of an insertion part 3 that is screwed into the open end threaded part 2 of the metal insert 1, and a flange part 4 having a larger diameter than this,
A metal insert fixing holder 7 having a through hole 6 in the central longitudinal direction through which a metal fixing bolt 5 is passed is molded from foamed plastic, such as expanded polystyrene. If the through hole 6 is a bag-shaped hole with a bottom 61, foreign matter such as concrete can be prevented from entering the insert 1. A driver groove 8 or a wrench groove 9 is provided on the surface of the flange portion 4. Note that by closing both outer ends of the driver groove 8, foreign matter can be prevented from entering from the outer periphery.

The outer diameter of the insertion portion 3 should be slightly larger than the inner diameter of the open end threaded portion 2 of the metal insert 1 to be screwed in. For example, if the inner diameter of the threaded portion 2 is 105 mm, the outer diameter of the insertion portion 3 should be 110 to 115 mm. . Further, the inner diameter of the through hole 6 is set to be slightly smaller than the outer diameter of the fixing bolt 5, for example, if the outer diameter of the bolt 5 is 6 mm, the inner diameter is set to 5.0 to 5.5 mm.

Next, I will explain how to use it. First, if the insertion part 3 of the fixing holder 7 is screwed into the open end threaded part 2 of the metal insert 1, the holder 7 is made of foamed plastic and has a slightly larger diameter than the open end threaded part 2, so the insertion part 3 A thread is cut on the outer periphery of the holder 7 so that the holder 7 is screwed into the metal insert 1.

Next, the insert 1 with the holder 7 attached is placed in a predetermined position in the formwork 10, and the metal fixing bolt 5 is inserted into the through hole 6 of the holder 7 through the mounting hole 11 previously drilled in the predetermined position of the formwork 10. When screwed in, the fixing bolt 5 has a slightly larger diameter than the through hole 6, so a female thread is cut on the inner periphery of the through hole 6, and the two screw together, thereby fixing the fixing bolt 5 to the holder 7. Ru. The mounting hole 11 is a screw hole, and the fixing bolt 5 is screwed into it.

With the insert 1 fixed at a predetermined position in the formwork 10 in this manner, concrete 12 is poured into the formwork 10. After the concrete 12 has hardened, loosen the fixing bolts 5 and remove them from the holder 7, and remove the formwork 10.
Remove the mold. Next, a driver or wrench is inserted into the driver groove 8 or the wrench groove 9, thereby loosening the holder 7 and removing it from the insert 1. Note that since the fixing holder 7 is made of polystyrene foam, instead of loosening and removing it, if it is ignited and burned, it burns out leaving almost no ash, so this method may be used.

When the fixing holder 7 is removed, the flange portion 4 of the holder 7 is located at the recessed portion 13 at the open end of the insert 1.
remains as. When burying the used insert 1 in concrete 12, this concave portion 13 is
This area can also be filled with mortar, which helps create a flat concrete surface.

<Effects of the invention> Since the present invention is constructed as described above, it has the following effects.

(1) Fix the insert to the formwork with a fixing bolt that is screwed into the through hole of the fixing holder that is screwed into the metal insert. Therefore, it is sufficient to simply drill a mounting hole in the formwork through which the fixing bolt passes, and repair of the formwork becomes easier than in the past.

(2) The fixing holder is made of foamed plastic,
Threads are cut on its outer and inner circumferences by a screwing operation. Therefore, there is no need to cut threads in the holder in advance, so the manufacturing cost of the fixing holder is reduced.

(3) Since the fixing holder is composed of an insertion portion and a flange portion having a large diameter, a recess is formed at the open end of the insert when the holder is removed from the insert. For this reason, when the insert is embedded in concrete after use, the concrete surface is finished flat.

(4) Since the insert is sealed by the screwed fixing holder until it is used, there is no risk of foreign matter getting into it.

[Brief explanation of drawings]

Figures 1 and 2 are perspective views showing the fixing holder of the present invention, Figure 3 is a vertical sectional view showing the metal insert, Figure 4 is a vertical sectional view showing the insert with the fixing holder fixed, and Figure 4 is a vertical sectional view showing the insert with the fixing holder fixed. FIG. 5 is an explanatory view showing how to use the insert, and FIG. 6 is a longitudinal cross-sectional view showing the buried state of the insert. DESCRIPTION OF SYMBOLS 1... Metal insert, 2... Open end threaded part, 3... Insertion part, 4... Flange part, 5... Fixing bolt.

Claims (1)

[Scope of utility model registration request] A metal insert consisting of an insertion part that screws into the threaded part at the open end of the metal insert, a flange part with a larger diameter, and a foamed plastic body with a through hole in the center longitudinal direction for passing a metal fixing bolt. Fixing of a metal insert in the fixing holder, in which the insertion part has a slightly larger diameter than the inner diameter of the threaded part at the open end of the metal insert, and the inner diameter of the through hole has a slightly smaller diameter than the outer diameter of the metal fixing bolt. holder.