JPH0512417Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> The present invention relates to an iron plate hoop formed of an iron plate in the shape of a frame.

<<Conventional technology and its problems>> In reinforced concrete construction (hereinafter referred to as RC construction), restraint reinforcements are provided to mutually restrain multiple main reinforcements (column main reinforcements, beam main reinforcements). This restraining reinforcement is usually composed of a frame-shaped steel wire (reinforcing bar hoop), and is arranged so as to surround the main reinforcement.
The restraining bars and the main bars are connected to each other by binding wires.

By the way, in recent years, high-rise or ultra-high-rise construction technology using RC construction has been developed, and along with this, there is a tendency to use large diameter or heavy reinforcing bars to a large extent. In RC structures using such large-diameter reinforcing bars, it is necessary to significantly increase shear reinforcement in areas with high axial stress, but conventional shear reinforcement using reinforcing bar hoops has certain limitations due to insufficient bearing capacity. Furthermore, when considering shear reinforcement of lap joints of main reinforcing bars, reinforcing bar hoops may make it extremely difficult to arrange the reinforcing bars. moreover,
The problem with reinforcing bar hoops is that they cannot provide shear reinforcement for the concrete inside the main reinforcement cage.

On the other hand, in order to increase the shear reinforcing force in the high axial force section and to shear reinforce the concrete inside the main reinforcement cage, it has recently been proposed to use iron plate hoops 1 instead of reinforcing bar hoops as shown in Fig. 3. (Jet application 1986-17124, Utility patent application 1984-133620)
reference). Inside this iron plate hoop 1, width-stopping iron plates 2 are disposed in a criss-cross pattern, and the width-stopping iron plates 2 regulate the spacing distortion between the side plate portions 1a of the iron plate hoop 1. The aim is to further increase the shear reinforcing force.

However, since the conventional width stopper steel plate 2 requires welding not only to both ends but also to the intersection part 3, the total welding length becomes relatively long, which poses a problem in terms of construction efficiency.

The present invention was developed to effectively solve the above-mentioned problems, and its purpose is to provide a steel plate hoop that has a relatively short welding length and can exert sufficient shear reinforcing force. It is in.

<Means for Solving the Problems> In order to solve the above-mentioned problems, the present invention surrounds a plurality of main bars with a steel plate frame, and also sets a plurality of width-stopping steel plates that cross the inside of the steel plate frame at different levels from each other. They are arranged in a crossed manner, and both ends of the width stopper iron plates are welded and fixed to the inner surface of the iron plate frame.

<<Function>> In the iron plate hoop constructed as described above, the width stopper steel plates do not intersect with each other, so installation and welding of the width stopper steel plates becomes easy, and construction efficiency can be improved, and the distance between the side plates of the steel plate hoop can be reduced. As in the past, strain is regulated by the width-stopping steel plates, and since the width-stopping steel plates are in contact with the concrete inside the main reinforcement over a wide area, sufficient shear replenishment force can be obtained.

<<Example>> An example of the present invention will be described below based on the drawings. FIG. 1 shows an embodiment using two width-stopping iron plates 4 and 5. As shown in the figure, these two width-stopping iron plates 4 and 5 are arranged at different heights, intersecting each other in a cross shape, and the center portions of both width-stopping iron plates 4 and 5 touch each other slightly. However, there is no complete intersection like in the past. Therefore, there is no blind welding point between the both width stopping iron plates 4 and 5. By arranging the width stopper iron plates 4 and 5 at different levels, the vertical width h of the width stopper iron plates 4 and 5 is half the height H of the iron plate hoop 1, but if necessary for strength, Measures such as appropriately increasing the thickness of the width stopper iron plates 4 and 5 may be taken. Both ends of the width stopper iron plates 4 and 5 are welded and fixed to the inner surface of the side plate portion 1a of the iron plate hoop 1, respectively, as in the conventional case.
The spacing strain between the side plate parts 1a is caused by the width stopper iron plate 4,
5 has come to be regulated.

Next, FIG. 2 shows an embodiment using four width stopper iron plates 6 to 9. In this example, the width stop iron plates 6 to 9 are
Because of the large number of steel plates, it is strong enough even if the thickness of the steel plate is the same as before. The relationship between the upper width stopper steel plates 6, 7 and the lower width stopper steel plates 8, 9 is the same as that shown in FIG. 1, and there is no welding point between the two steel plates.

The steel plate hoop 1 is constructed as described above, and since there are no welded parts between the upper and lower width-stopping steel plates, construction efficiency is increased accordingly, and width-stopping steel plates 4, 5, 6 to 9 are spread over a wide area on the concrete inside the main reinforcement girder. Since the inner concrete is in contact with the inner concrete, shear reinforcement can be achieved. In addition,
The installation position of the width stop steel plate is shown in Figure 2.
If it is set to the 0 position, the mutual restraining effect of the main reinforcements 10 will be further enhanced, and the shear strength can be increased.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above-mentioned embodiment and can be modified in various ways. For example, the shape of the iron plate hoop 1 is not limited to a rectangular shape, but may be circular to correspond to the shape of a column. Also, the width stopper iron plate does not necessarily have to be in two layers, upper and lower.
Of course, it is possible to have three or more stages, and in addition to intersecting at right angles, the width stopper iron plates may also be intersected at an appropriate angle, and especially for circular iron plate hoops, they may be intersected radially. You can let me.

[Effects of the invention] As mentioned above, in this invention, the width stopper steel plates arranged inside the steel plate hoop are shifted from each other in different steps and intersect with each other, so there is no need to weld the width stopper steel plates to each other, and the sameness is achieved accordingly. The installation work of iron plates can be carried out efficiently, shortening the construction period and reducing construction costs.

[Brief explanation of the drawing]

Figures 1 and 2 show an embodiment of the present invention, in which Figure 1 is a perspective view of a steel hoop with two width-stopping iron plates, and Figure 2 is a perspective view of a steel plate hoop with four width-stopping iron plates. It is a perspective view of the iron plate hoop which has. Also the third
The figure is a perspective view of a conventional iron plate hoop. 1... Iron plate hoop, 4-9... Width stopper iron plate, 1
0... Main plot.

Claims (1)

[Scope of utility model registration request] A plurality of main reinforcements are surrounded by a steel plate frame, and a plurality of width-stopping steel plates are arranged to cross each other at different levels, crossing the inside of the steel plate frame, and both ends of the width-stopping steel plates are connected to the inner side of the steel plate frame. An iron plate hoop that is fixed by welding.