JPS6355270A - Reinforcing bar assembling construction method - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a reinforced concrete structural column in which a large number of deformed reinforcing bars and ordinary reinforcing bars are used as the main reinforcement of columns and beams, and the ends of the reinforced concrete structure are butt-welded to each other. This invention relates to a method of arranging the hoop muscle and the tang muscle, which are circular muscles.

[Prior art and problems to be solved by the invention] When columns and beams are made of reinforced concrete, a large number of deformed reinforcing bars and regular reinforcing bars are used as the main reinforcement, and a ring-shaped reinforcement is formed around the outer circumference of the reinforced concrete. Often placed. The annular reinforcing bars used in this case are usually formed by forming predetermined reinforcing bars into an annular shape at the construction site and used as stirrups, as shown in FIG. 6, for example. However, as shown in Figure 6 (fat), a hook that is separate from the top requires 4 d or more and 10 d or more (where d is the diameter of the reinforcing bar). When constructed with two reinforcing bars, hooks of 4 d or more and 10 d or more were required, respectively.

The same is true even when hoop muscles are used, as shown in Figure 7 (a
) and FIG. 7 (bl), when forming an annular joint, an overlapping portion of 10 d or more was required in the case of arc welding.

Thus, the need for a hook or overlap in the circular muscle not only makes the circular muscle heavier;
Its installation is also troublesome, and there is also the disadvantage that bending work must be performed at the construction site.

On the other hand, there is a method of processing such circular reinforcement in a pot and then transporting it to the site by combining it with a part of the main reinforcement, but this is not common because it is not only expensive but also expensive to transport.

Also, recently (S) in Figure 8 ta+ and (S) in Figure 8 fbl
The spiral hoop muscle shown in ') is now often used. When transporting it to the site, it is compressed from above and below, similar to how a spring is compressed, and then folded and tied so that the strings are in close contact with each other. The hoop muscles are then placed around the outer periphery of the main muscle group and untied at the site, but since the hoop muscles are plastically deformed, they cannot be fully stretched by their own elastic force, even if they are stretched by hand. It is not possible to maintain the same pitch over the entire length, and the pitch needs to be adjusted. This pinch adjustment requires effort and time, and in the case of the core reinforcement shown by (Sa) in Figures 8(a) and 9, it is necessary to weld each core reinforcement to the spiral hoop reinforcement at each location. There is. Further, in this case, since the spiral hoop lines are oblique, it is very difficult to apply the core line (Sa), and furthermore, it is difficult to follow the outer circumferential hoop during welding, making it difficult to weld. in this way,
When using spiral hoop muscles, it is technically quite difficult. These are the drawbacks of reinforcement using spiral hoop reinforcement.

The present invention aims to eliminate these drawbacks.

[Means for solving problems]

The present invention provides a closed type hoop reinforcement whose ends are butted together and welded, and a closed type hoop reinforcement whose ends are butted and welded together and which is located near the center of the cross-sectional shape of a column or beam. A predetermined number of surrounding core reinforcements, which are almost rectangular in shape, are inserted into predetermined positions of a large number of main reinforcements of a column or beam (Fig. 2), and then both are inserted as shown in Fig. 1. Then, they are disassembled and connected to the main reinforcements in a direction perpendicular to each main reinforcement and at a predetermined interval from each other.

[For production]

In this way, among the many main reinforcements, the main reinforcement located near the center of the cross-sectional shape of the column or base will be surrounded by the rectangular core reinforcement. Therefore, even if the number of main reinforcements is large and the cross-sectional shape of the column or beam is, for example, a 5Qcm square column or l+
Even when the size becomes large, such as a square column, the spacing (pitch) between each main reinforcement can be maintained at the correct dimensional accuracy by using the core reinforcement, and the cross-sectional shape of the hoop reinforcement or column or beam that surrounds the outside of each main reinforcement can be maintained at the correct dimensional accuracy. This can prevent the concrete located near the center from swelling.

〔Example〕

Embodiments of the present invention will be described with reference to the accompanying drawings.

In an embodiment, a case will be described in which the present invention is applied to the arrangement of hoop reinforcements and core reinforcements in the main reinforcement of a column having a rectangular cross-sectional shape.

A large number of main reinforcing bars (fl) are arranged to form a rectangular frame in plane, similar to the cross-sectional shape of the column (A). On the outside of a large number of main reinforcing bars (1) arranged in a frame shape, there are closed hoop reinforcing bars (2) whose ends are butted against each other and welded in a direction perpendicular to each main reinforcing bar (11) and in the upper and lower directions in Figure 3. The main reinforcing bars (1a) located between each hoop reinforcing bar (21,
) is a rectangular core bar (3a) on the outside of the main bar (3a).
1b), rectangular core reinforcements (3b) are arranged with a predetermined interval between the upper and lower sides of FIG. 3, respectively.

For example, if the maximum diameter of the hoop strip (2) exceeds 6001 m, the diameter of the material is 13 mm, and the upper and lower hoop strips (2+, (the interval between 2+, that is, the pitch is 100 + n
In addition, if the maximum diameter of the hoop strip (2) is 600 fins or less, the diameter of the material should be 10 layers, and the upper and lower hoop strips (the interval of 21, +21, that is, the pitch is 100 fins, etc.), etc. It is preferable to select various diameters, ie, thicknesses, of the material of the striations and the distance between the upper and lower hoop striations, ie, the pitch.

A predetermined number of hoop bars (2) are placed outside the large number of main bars (Ia) and (Ib), and a main bar (2) located between each hoop bar (2+, +21 and near the center of the large number of main bars (1))
When arranging the rectangular core reinforcement (3a) on the outside of 1a) and the rectangular core reinforcement (3b) outside of the main reinforcement (1b), these are shown in Figure 2. A large number of main reinforcing bars (1) are inserted at predetermined positions as shown in FIG. and connect to each main reinforcement.

When this method is adopted, the main reinforcement, hoop reinforcement (2),
It is sufficient to bring the core bars (3a) and (3b) to the site and assemble them there, which is convenient in terms of transportation to the site, storage, etc. Although welding is generally used to connect the hoop reinforcements (2), core reinforcements (3a), and (3b) to each main reinforcement, the present invention is not limited to this.

Hoop muscle (2), core muscle (3a) in the example,
The shape of (3b) is a rectangular shape in plan, but if the column is circular or cylindrical, the hoop muscle (2) will be circular, and the core muscle (3a) will be circular.
), (3b) also do not have a regular rectangular shape, and the main reinforcement (I
The space between a), (la), (lb), and (lb) is a deformed shape of an externally projecting arc, but these shapes vary depending on the shape of the column. In addition, in the case of the example, two types of core muscles (3a) and (3b) were arranged in a planar cross shape, but if one of them - only stress in the force direction is required, the other is unnecessary. Therefore, it can be omitted.

Core reinforcements (3a) and (3b) are main reinforcements (l) located facing each other near the center of each main reinforcement arranged in a rectangular frame shape.
a) and (lb) are arranged so as to surround the outside, so that each main reinforcement can constantly maintain a predetermined interval. Therefore, even if a formwork (B) as shown by the chain line in Fig. 5 is constructed outside the formwork (B) and concrete (4) is poured into the formwork (B) to form a reinforced concrete column, the concrete pressure will The shapes of the main reinforcements, especially the main reinforcements (1a) and (1b) located near the center, are not disturbed.

In addition, the hoop muscle (2) and the tungsten muscle (3a), (3b)
Both ends are butt welded, so the conventional
As there are no overlapping parts, the poured concrete can be rolled easily.

In addition, as shown in Fig. 4, the hoop muscle (2) and the tangential muscle (
3a) and (3b) overlapping each other (and welding them together to make them integral), compared to placing them separately on each main reinforcement as shown in Figure 3. The time and effort required is reduced to 1/3, and the number of man-hours is reduced accordingly, which has the advantage of shortening the construction period and streamlining construction management.

In the embodiment, the case where the present invention is applied to a column has been described, but it goes without saying that the present invention can also be applied to a beam.

〔Effect of the invention〕

According to the present invention, due to the presence of the core reinforcement, the main reinforcement located near the center of the column or beam among the many main reinforcements will not be disturbed even by concrete pressure. Ideal for making into beams.

Even when calculations require that the diameter of the hoop muscle be increased or the pitch must be decreased, the core hoop has the advantage of being able to maintain the conventional diameter and pitch. In addition, since the ends of both the hoop reinforcement (2) and the core reinforcement are butt welded, there is no overlap like in the past, and the poured concrete will move better, so we can expect a synergistic effect from this. Can be done. In addition, the seventh example showing the conventional example is
Even when three hoops in one direction are required as in Figure (al), in the case of the present invention, two hoop bars are used, such as the outer hoop is D13 and the core hoop is DIO (however, D is the diameter of the reinforcing bar). Since various combinations with different diameters can be made, not only can the number of welding locations be reduced, but also costs can be saved.

Furthermore, when the construction method according to the present invention is adopted, all the materials need to be brought to the site and assembled there, which is advantageous in terms of transportation to the site and storage.

[Brief explanation of the drawing]

Figures 1 to 5 of the accompanying drawings show an embodiment in which the present invention is applied to a column, with Figure 1 being a plan view showing the state after reinforcing bars are assembled, Figures 2 and 3. Figure 4 is a side view showing the state before and after reinforcing bars are assembled, Figure 4 is a perspective view showing the hoop reinforcement and two core reinforcements integrated, and Figure 5 is a view of the column after concrete is poured. Cross-sectional view, Figure 6 fat, (b) and Figure 7+a), (bl is a front view of only the conventional circular reinforcement, Figure 8 (al), (bl is the spiral construction method, which is one of the conventional construction methods) A side view showing an assembled state using hoop reinforcements. FIG. 9 is a cross-sectional view in the case of FIG. 8 (al). fl), (la), (lb) - main reinforcement, (2) - hoop Muscle, (3a), (3b) -m-core muscle. Patent applicant Toyo Wire Net Co., Ltd. (and 2 others) Figure 1 Figure 5 1.1a, Ib: 'E;li 2: Fu 3a, 3b : Core figure 3 Figure 2 old and 22. 11 - Shoulder muscle collapse Figure 4 Figure 6 (Q) (b) (Q) (b) ia, lb: l child) 2: Hoop night 3a, 3b: Core muscle

Claims (1)

[Claims] 1. A closed hoop muscle whose ends are butted together and welded;
Core reinforcement, which is a closed type whose ends are butt-welded to each other and has an approximately rectangular shape surrounding any main reinforcement located near the center of the cross-sectional shape of the column or beam, is A method of assembling reinforcing bars characterized by inserting a predetermined number of main reinforcing bars at predetermined positions at once, and then separating them and joining them to the main reinforcing bars in a direction perpendicular to each main reinforcing bar and at a predetermined interval from each other. . 2. The reinforcing bar assembly method according to claim 1, wherein the hoop reinforcement and the core reinforcement are welded together so as to overlap.