JPH09125531A - Insert - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an insert having sufficient fixing strength in quantities at low cost by providing protruded sections radially extended from a pedestal section having an area larger than the outer diameter area of a shaft section, and protruding branch sections from the protruded sections. SOLUTION: An opened inside screw 3 is provided at one end section of the shaft section 2 of an insert 1, and a pedestal section 4 having an area larger than the outer diameter area of the shaft section 2 is provided at the other end section. One or multiple protruded sections 5 radially extended from the pedestal section 4 are provided. Branch sections 6 are protruded from the tip section vicinities 7 of the protruded sections 5, and they are connected to the tip section vicinities 7 of the other adjacent protruded sections 5. The fixing area is increased without prolonging the whole length, and sufficient fixing strength can be exerted even if the shaft section 2 is short when the insert 1 is buried and used in a concrete panel thin in thickness. The insert 1 is integrally made of spherical graphite cast iron, it is coated with an epoxy resin paint, and an inside screw 3 is mechanically machined to complete the insert 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert for embedding in a concrete panel or the like and attaching the panel or the like to a structure.

[0002]

2. Description of the Related Art The use of concrete panels has become the mainstream in building construction because of labor saving at construction sites and shortening of construction period. Recently, however, the weight of concrete and the thickness of panels have been reduced with the increase in the number of buildings. As a result, high-strength concrete and lightweight cellular concrete panels have also been adopted in various fields. Further, as the thickness of the panel becomes thinner, the joint metal fittings to be used by being embedded in the concrete panel, that is, the insert and the like, are required to be smaller and lighter.

An example of such an insert is disclosed in Japanese Utility Model Publication No. 4-16805. FIG. 6 shows an insert 11 embedded in concrete 10.
FIG. Insert 11 is bolt 12
It is fixed to the structure 13 via. Elongated shaft 14
Is provided with an inner screw 15 for fixing to the structure 13 with a bolt 12 at one end, and a flange 16 and a fin 17 for fixing to the concrete 10 at the other end.

For lightweight cellular concrete panels, there is one disclosed in Japanese Utility Model Publication No. 6-36090.
Although not shown, a long nut for fixing to the structure is welded to the center of a wide plate-like anchor metal fitting for locking to two vertical reinforcing bars in concrete, and vertical reinforcing bars are attached to both ends. It has a shape that can be attached to.

A further improved insert is disclosed in Japanese Utility Model Publication No. 7-32655. FIG. 7 is a plan view of the insert. The shaft 14 has an inner screw 15 that opens at one end, a pedestal 18 at the other end, and a protrusion 19 from the pedestal 18.

[0006]

The thickness of the recent panel is thinner than that of the conventional panel.
The insert 11 described in Japanese Patent No. 5 has become difficult to handle. The size of the fixing flange 16 is relatively smaller than the length of the elongated shaft portion 14. That is, since the fixing area obtained by subtracting the cross-sectional area of the shaft portion 14 from the cross-sectional area of the flange portion 16 is small, it is difficult to obtain the cone-shaped breaking strength.
The fixing strength to the concrete 10 becomes insufficient. On the other hand, lengthening the shaft portion 14 to increase the fixing strength is limited when the thickness of the concrete 10 is thin.

Further, in the shape disclosed in Japanese Utility Model Publication No. 6-36090, the anchor metal fitting needs to be wide enough to be engaged with the two vertical reinforcing bars, which makes it difficult to miniaturize the anchor metal fitting and the length of the anchor metal fitting. Welding with nuts is also required.

Since the projecting portion 19 is provided in Japanese Utility Model Publication No. 7-32655, the fixing area is increased as compared with the insert 11 described in Japanese Utility Model Publication No. 4-16805, so that the fixing strength is increased. However, recently, due to the diversification of concrete materials and the tightening of design standards, further improvement of the fixing strength has been required. In view of these problems, the present invention provides an insert that has sufficient fixing strength even for a thin panel having a small embedded depth and can be mass-produced at low cost.

[0009]

As a result of earnest research to achieve the above object, the present invention has an inner screw opening at one end of a shaft portion and has an outer diameter area of the shaft portion at the other end. In an insert having a pedestal portion having a large area, one or more projecting portions radially extending from the pedestal portion are provided in order to increase the fixing strength, and a plurality of branch portions are further projected from the projecting portion. It is based on the finding that the purpose can be achieved by increasing the fixing area. Further, if the shaft portion, the pedestal portion, the projecting portion, and the branch portion are integrally formed, auxiliary work such as welding becomes unnecessary.

The first aspect of the invention is an insert having an inner screw opening at one end of a shaft portion and a pedestal portion having a larger area than the outer diameter area of the shaft portion at the other end. , One or more projecting portions radially extending from the pedestal portion are provided, a plurality of branch portions are further projected from the projecting portions, and the shaft portion and the pedestal portion, the projecting portion, and the branch portion are integrally formed. According to a second aspect of the present invention, the pedestal portion is provided with two projecting portions in a straight line, and branch portions are further projected from the projecting portions. A third aspect of the invention is that the pedestal portion is provided with four protrusions in a cross shape, and a branch portion further protruding from the protrusions is formed. Since one or more or two or four projecting portions are radially provided from the pedestal portion and the branch portions are further provided, the fixing area is significantly improved without increasing the entire length. Furthermore, a fourth aspect of the present invention has a shape in which a plurality of protrusions are provided, and a branch further protruding from one protrusion is connected to another protrusion. Since both ends of the branch portion are connected to the projecting portion, the strength of the branch portion itself of the insert is high and a sufficient fixing area can be secured.

Further, in the fifth invention, the above-mentioned material is an iron-based casting. By using an iron-based casting, the shaft portion, the pedestal portion, the protruding portion, and the branch portion can be easily integrally formed, and a strong fixing strength can be secured.

The sixth aspect of the invention is a method in which various kinds of plating or various kinds of inorganic or organic paints are coated. It is possible to prevent corrosion due to general oxidation and corrosion due to electrolytic corrosion and improve reliability.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to FIGS. 1 to 5, but the present invention is not limited to these.

[0014]

First Embodiment FIGS. 1 to 3 show a first embodiment of the present invention. 1 is a front view in which a part of the shaft portion 2 is shown in cross section, FIG. 2 is a plan view, and FIG. 3 is a side view. An inner screw 3 that opens at one end of the shaft portion 2 of the insert 1 is provided, and a pedestal portion 4 having an area larger than the external area of the shaft portion 2 is provided at the other end portion. Although the pedestal portion 4 has a circular shape that is concentric with the shaft portion 2 in the present embodiment, the pedestal portion 4 is not limited to a circular shape and may have a quadrangular shape or another shape, which means that the fixing strength (fixing area) increases. It may have a shape.

Further, the projecting portion 5 has a shape in which two projecting portions 5 extend straight from the pedestal portion 4 in a direction substantially perpendicular to the axis of the shaft portion 2.

Further, each projecting portion 5 is provided with a branch portion 6 in a direction substantially at a right angle. In this embodiment, as shown in FIG. 2, each of the protrusions 5 has four branches 6 (in FIG. 2, two branches 6 are provided above and below the protrusions 5, respectively).
However, the number is not limited, and the shape is not limited to the rod shape having a quadrangular cross section. Similar to the protrusion 5, the fixing strength (fixing area) may be increased.

The insert 1 has a shaft portion 2, a pedestal portion 4,
Since all the protrusions 5 and the branches 6 are integrally formed and the material is made of spheroidal graphite cast iron, mass production can be performed inexpensively and efficiently.

Next, it was coated with an epoxy resin paint, and the inner screw 3 was machined to obtain a finished product. Iron-based castings such as spheroidal graphite cast iron may have reduced strength due to corrosion or electrolytic corrosion during use. Therefore, corrosion can be prevented by coating various kinds of plating or an inorganic or organic paint such as zinc or epoxy resin.

Further, the material is stainless cast steel.
Since stainless steel has excellent corrosion resistance, there is no need to apply plating or paint to use it, and it is easy to manage and highly reliable.

[0020]

Embodiment 2 FIGS. 4 and 5 show a second embodiment. FIG. 4 is a front view showing a cross section of a part of the shaft portion 2, and FIG. 5 is a plan view. Similar to the first embodiment, an inner screw 3 that opens at one end of the shaft portion 2 of the insert 1 is provided, and a pedestal portion 4 having an area larger than the outer surface area of the shaft portion 2 is provided at the other end portion. Further, four projecting portions 5 are arranged in a cross shape from the pedestal portion 4. Further, in order to further increase the fixing strength (fixing area), the branch 6 is projected from the vicinity 7 of the tip of the protrusion 5 and is connected to the vicinity 7 of the tip of another adjacent protrusion 5. Even if the branch part 6 has a relatively small cross-sectional area, both ends are connected to the projecting part as an integral body, so not only the strength of the branch part of the insert becomes strong, but also the fixing strength to concrete is significantly improved. did it.

In this embodiment, the protruding portion 5 is the same as in the first embodiment.
Although the number is 2 and the number is 4 in the second embodiment, the number may be determined according to usage conditions, such as 1 provided in an L-shape or 3 provided with an angle divided into three equal parts. Also, the protrusion 5
Although the branch portion 6 is linearly connected between the tip end portion vicinity 7 and the adjacent tip end portion vicinity 7 of the protruding portion 5, the branch portion 6 may be arranged in an arc shape and may not be connected. A single branch shape protruding from the protruding portion 5 may be used.

Next, as in Example 1, the material was integrally manufactured from spheroidal graphite cast iron, further coated with an epoxy resin paint, and the inner screw 3 was machined to complete a finished product.

[0023]

As described above, according to the present invention, since the length of the shaft portion is short, it is possible to use a concrete panel having a small thickness without any trouble, and it is possible to secure sufficient fixing strength. Mass production is easy and an inexpensive insert can be provided.

[Brief description of the drawings]

FIG. 1 is a partial sectional front view of a first embodiment of the present invention.

FIG. 2 is a plan view of the first embodiment of the present invention.

FIG. 3 is a side view of the first embodiment of the present invention.

FIG. 4 is a partial sectional front view of the second embodiment of the present invention.

FIG. 5 is a plan view of a second embodiment of the present invention.

FIG. 6 is a partial cross-sectional front view of a conventional insert embedded in concrete.

FIG. 7 is a plan view of another conventional insert.

[Explanation of symbols]

 1: Insert 2: Shaft part 3: Inner screw 4: Pedestal part 5: Projection part 6: Branch part 7: Near tip part

Claims (6)

[Claims] 1. An inner screw opening at one end of a shaft portion,
In an insert having a pedestal portion having an area larger than the outer diameter area of the shaft portion at the other end, one or more protruding portions radially extending from the pedestal portion are provided, and a plurality of branches are further provided from the protruding portion. The shaft portion and the pedestal portion, the protruding portion,
An insert characterized in that the branches are integrally formed. 2. The two projecting portions are provided in a straight line, and the branch portion is further projected from the projecting portions.
Insert as described. 3. The insert according to claim 1, wherein four protrusions are provided in a cross shape, and branch portions further protruding from the protrusions are formed. 4. The insert according to claim 1, wherein a plurality of protrusions are provided, and a branch further protruding from one protrusion is connected to another protrusion. 5. The insert according to claim 1, wherein the material is an iron-based casting. 6. The insert according to claim 1, wherein the insert is coated with various kinds of plating or various kinds of inorganic or organic paints.