JPH08312004A - Insert - Google Patents

Abstract

PURPOSE: To prevent the destruction trouble of a concrete plate by arranging a pair of bar arrangement members welded at a fixed inclination angle at the axial tip part of a long nut buriedly provided in parallel to the surface and back of the concrete plate. CONSTITUTION: An insert is composed of a long nut 21 buriedly provided along the edge 9a of a concrete plate 9 and a pair of bar arrangement members 22, 22 which are weldedly fixed to the tip part of the long nut 21 in parallel to the surface and back of the concrete plate 9 with inclinations formed mutually opposite in an axial direction at about 30 degrees. The bar arrangement members 22, 22 welded in this way can surely resist against bending force at the time of the drawing out of a pattern and erection for concrete 9 and also drawing out force at the time of hanging up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert used for releasing a concrete plate, raising it, and lifting it, more specifically, it is provided on an edge of the concrete plate and is used for releasing the concrete plate from the mold. The present invention relates to an insert capable of preventing shear failure or pulling out of the concrete plate that occurs at the time of lifting or lifting.

[0002]

2. Description of the Related Art Conventionally, a concrete plate 9 is referred to as an insert for mainly preventing the shear failure of the concrete plate 9 at the time of lifting the concrete plate 9 and connecting a hanging jig (not shown). Although the long nut 11 to be embedded is embedded, when the concrete plate 9 is removed from the mold,
In addition, the concrete plate 9 often suffered shear failure (breakage portion 8) at the time of building (Fig. 1 (a)).

Therefore, in order to prevent the shear failure of the concrete plate 9 that occurs when the concrete plate 9 is removed from the mold and when it is built up, as shown in FIG.
A bar arrangement member 1 in which a is perpendicular to the long nut 11 embedded along the edge 9a of the concrete plate 9
2 and the other end 11b in the axial direction of the long nut 11
An insert that is reinforced by further extending it and integrating it with a bar arrangement member 13 whose tip portion is curved like a hook is currently proposed.

[0004]

However, in the above-mentioned conventional insert, the reinforcing bar 12 which is orthogonal to the long nut 11 prevents shear failure of the concrete plate 9 when the concrete plate 9 is built up. Yes, and the other end 11b in the axial direction of the long nut 11
The bar arrangement member 13 which is further extended and the tip portion of which is curved on the hook prevents the concrete plate 9 from being pulled out when the concrete plate 9 is lifted up. Since prevention of shear failure and pulling out of the concrete plate 9 at the time of raising and at the time of lifting is performed by the separate reinforcing bar members 12 and 13, at least two kinds of reinforcing bar members must be prepared.

The present invention focuses on the above-mentioned drawbacks of the prior art and solves this problem. The object of the present invention is to face the front and back surfaces of a concrete board without requiring many kinds of reinforcing members. By improving the arrangement of one type of reinforcing bar member formed in a predetermined shape on each facing surface of the long nut, it is possible to prevent shear failure or pull-out of the concrete plate when the concrete plate is released from the mold, built up, or lifted. It is to provide an insert that can be reliably prevented.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above objects, and the gist thereof is an insert provided at an edge portion of a concrete board,
A long nut whose one end is embedded along the edge of the concrete plate and a front and back surfaces of the concrete plate that are parallel to each other and are inclined at predetermined angles in opposite directions with respect to the axial direction of the long nut. An insert characterized by comprising a reinforcing bar member having a predetermined shape integrated with each facing surface of the long nut facing the front and back surfaces of the concrete.

As the long nut embedded in the concrete plate, for example, a long nut that secures an area where the reinforcement members can be integrated by welding or the like can be used, and an appropriate long nut such as an existing long nut is used. You can The other end of the long nut may be sealed.

[0008] Further, as the reinforcing bar member, deformed rebar,
Appropriate ones can be used from round steel, flat steel, etc., and one having a hook-shaped tip can be used. The diameter (or circumference) and axial length of the bar arrangement member are
It can be appropriately determined based on the tensile force or the compressive force generated during each work. It is desirable that the inclination angle of the reinforcing bar member integrated with the long nut is about 30 degrees, which increases the adhesion resistance to the reinforcing bar. Further, it is desirable that the fixing position of the long nut and the reinforcing member be closer to the end of the concrete plate in order to minimize bending that occurs when the concrete plate is released from the mold and built up.

[0009]

In the insert of the present invention, the inserts are parallel to the front and back surfaces of the concrete board and opposite to the axial direction of the long nut embedded so that one end of the insert is along the edge of the concrete board. A reinforcing member having a predetermined shape, which is inclined at a predetermined angle and is integrated with each facing surface of the long nut facing the front and back surfaces of the concrete, resists a bending force at the time of erecting the concrete board and It resists the pulling force at the time of demolding and at the time of lifting, reliably prevents the shear fracture of the concrete that occurs at the time of demolding and building of the concrete plate, and resists the pulling force at the time of lifting.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited thereto.

Provided on the edge 9a of the concrete plate 9,
As shown in FIGS. 2 (a) and 2 (b), the insert of the present invention capable of preventing the shear failure of the concrete board 9 when the concrete board 9 is raised or lifted has one end 21a at the end. Of the long nut 21 embedded along the edge 9a of the concrete nut and the front and back surfaces of the concrete plate 9 in parallel with each other and inclined by 30 degrees in the opposite direction with respect to the axial direction of the long nut 21. The reinforcing nuts 22 and 22 'each have a predetermined shape and are welded to the respective facing surfaces of the long nut that face the front and back surfaces of concrete.

The long nut 21 has an inner diameter of 16 mm and an axial length of 7
It has a thickness of 0 mm, and a hanging jig (not shown) is screwed and fixed to the female screw engraved inside.

The bar arrangement members 22 and 22 'have an outer diameter of 10
mm and an axial length of 300 mm, the deformed bar is welded to a predetermined position on each of the facing surfaces of the long nut 21 determined based on the shearing force and the tensile force calculated from the working mode.

The reinforcement members 22, 22 'welded in this way
According to this, it is possible to reliably resist the bending force Q × d when the concrete plate 9 is released from the mold and when it is built up, and also reliably resist the pulling force 2Q when the concrete plate 9 is lifted. can do.

In FIG. 2 (b), Q is the shearing force of the concrete plate 9 when the concrete plate 9 is released from the mold, and is raised, and d is the long nut 21 and the reinforcing bar members 22, 2.
The distance between the fixed portion of 2'and the edge 9a of the concrete plate 9, h is the distance between the centers of the reinforcing members 22 and 22 ', N and T are the values of the insert when the concrete plate 9 is demolded and when it is built up. Push and pull force.

Generally, the bending force M applied to the insert when the concrete plate 9 is demolded and when it is raised is in a relationship equal to the value obtained by multiplying the shearing force Q by the distance d, and the pushing and pulling forces N and T are given. Is equal to the bending force M divided by the center-to-center distance. In the present invention, by arranging the bar arrangement members 22 and 22 'with a predetermined angle of inclination, it is possible to improve the resistance to the push-pull forces N and T. Specifically, n = T between the push and pull forces N and T, the tilt angle θ, and the compressive tension forces n and t.
There is a relationship of t = N / cos θ = T / cos θ.

The reinforcing members 22 and 22 'are shown in FIG.
As shown in FIG. 5, the bar arrangement members 23 and 23 ′ whose tip portions are curved in a hook shape may be used.

[0018]

According to the insert of the present invention, one type of bar arrangement member formed in a predetermined shape is provided in a direction opposite to the axial direction of the long nut without the need for many types of bar arrangement members. By arranging at an angle and improving the arrangement of the reinforcing bars by integrating with the facing surfaces of the long nuts that face the front and back of the concrete plate, it is possible to ensure the shear failure of the concrete plate when the concrete plate is removed from the mold or built up. Therefore, it is possible to resist the pulling force generated during lifting.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing a conventional insert and shear failure of a concrete plate, and FIG. 1 (b) is a perspective front view showing still another conventional insert.

2A is a perspective front view showing an embodiment of an insert of the present invention, and FIG. 2B is a perspective side view of FIG. 2A.

FIG. 3 is a perspective front view showing another embodiment of the insert of the present invention.

[Explanation of symbols]

 9 Concrete plate 11,21 Long nut 12,13,22,22 ', 23,23' Reinforcing member

Claims (1)

[Claims] 1. An insert provided on an edge portion of a concrete plate, wherein a long nut embedded at one end along the edge portion of the concrete plate and parallel to front and back surfaces of the concrete plate, In addition, the bar is composed of a reinforcing member having a predetermined shape, which is inclined at opposite angles to the axial direction of the long nut by a predetermined angle and is integrated with the facing surfaces of the long nut facing the front and back surfaces of the concrete. Characteristic insert.