JPH0978689A - X-shaped arrangement method of reinforcements - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the bending reinforcement effect and improve breakage conditions, by providing parallel parts formed at the ends of X-shaped arrangement of reinforcements within the clear span and arranging reinforcements in the parallel parts. SOLUTION: Parallel parts 12 are formed at the ends of X-shaped reinforcements 11 within the clear span. As the specifications of the parallel parts 12, the length 1h is selected so as to be within the range of 1h: D/3-D/2 against the beam height D. Lateral reinforcements 13 are arranged in the parallel parts 12. Regarding to prefabricated arrangement of reinforcements, the parallel parts 12 of the X-shaped arrangement of reinforcements 11 are in close proximity to the parallel reinforcements 10 and hence, these can be easily fixed by binding these parts. In this way, when reinforcements are arranged to form a X-shape in a short span, the breakage conditions can be improved and also the bending reinforcement effect of X-shaped arrangement of reinforcements is improved and further, the prefabricating arrangement of reinforcements can be easily applied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an X-shaped reinforcing method for improving the bending shear properties of short-span beams as well as the adhesiveness.

[0002]

2. Description of the Related Art Peripheral tube / core wall frame made of reinforced concrete (RC) that enables large space construction is shown in FIG. 11 and FIG.
It comprises a tube frame 1 and a core wall 2 as shown in FIG. Figure 11 shows that if the tube frame 1 is the standard frame 3,
FIG. 12 shows the case where the tube frame 1 is an eccentric beam frame 4 and a wall type frame frame 5. In the figure, 6 is a boundary beam of the core wall 2.

In such a structure type as the outer peripheral tube / core wall frame, the tube frame 1 has a normal span, and the main bars of the columns 7 and the beams 8 are parallel bars 10 as shown in FIG. is there. In the figure, 9 indicates a reinforcing bar joint.

On the other hand, it is attached to the outer perimeter frame and the core wall.
Since it cannot be dealt with by means of 10, the method of arranging the X-shaped bar 11 as shown in FIG. 10 has been proposed.

It is well known that the provision of the core muscle is effective for buckling and attachment of the reinforcing bar.
By using the shaped reinforcing bar 11, the bending shearing property which improves the adhesiveness in addition to the bending shearing property is improved, but as the improvement of this X type reinforcing bar 11, a high strength reinforcing bar and concrete are used. The action and effect of this is as described in the annual report of concrete engineering Vol.17, No.2, 1995, but it is not necessarily effective.

[0006]

[Problems to be Solved by the Invention] A conventional method for arranging X-shaped bar 11 shown in Fig. 10, including the one described in the above-mentioned annual report of concrete engineering Vol.17, No.2, 1995. In this case, the reinforcing bar is arranged in the X shape in the clear span, and the structural performance (load-deformation property) shows stable toughness property in the large deformation region, but there were the following problems. .

In the first case, there is a case where the proof stress is suddenly lowered due to buckling of the reinforcing bar at the starting end portion of the X-shaped bar 11 and destruction of the concrete (compression side). The second is that the bending strength of the beam member is lower than that in the case where all of them are arranged in parallel, because the main bars are X-shaped to resist shearing. In No. 3, in the clear span, the X-shaped bar 11 does not contact the hoop bar in the hoop bar bar, so prefabricated bar assembly is difficult and some special fixture is required.

The object of the present invention is to eliminate the disadvantages of the above-mentioned conventional example, to improve the fracture property, to improve the bending reinforcing effect of the X-shaped bar, and to apply the prefabricated reinforcing bar construction method (reinforcing bar preassembly method). It is to provide an X-shaped bar arrangement method that is also easy.

[0009]

In order to achieve the above-mentioned object, the present invention provides an X-shaped reinforcing bar on the inner end of the clear span.
There is a parallel portion formed at the end of the shape reinforcement, and transverse reinforcement is arranged in this parallel portion, and the length l _h of the parallel portion of the X shape reinforcement is l _{h with} respect to the beam ridge D: The gist is that the specifications are D / 3 to D / 2.

According to the first aspect of the present invention, since the end portion of the X-shaped bar of the beam is restrained by the lateral reinforcing bar, buckling of the X-shaped bar and crushing of concrete are prevented, and the X-shaped bar is prevented. Since there is a parallel part at the end of the muscle, it is possible to expect an increase in bending strength and a strengthening effect. Furthermore, the prefabricated reinforcing bar assembly can be easily performed by utilizing the parallel portion of the X-shaped reinforcing bar.

According to the second aspect of the present invention, the beam beam D
D / 2 is considered to be the hinge zone (Ultimate strength design guideline: Architectural Institute of Japan), and it was taken into consideration that the reinforcing bar joint is possible at D / 3.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a side view showing an embodiment of an X-shaped bar arrangement method of the present invention, FIG. 2 is a plan view of the same as above, FIG. 3 is a sectional view taken along the line aa of FIG. 1, and FIG. 4 is a sectional view taken along the line bb of the same. so,
The same components as those of the conventional example shown in FIG. 10 are designated by the same reference numerals.

In the figure, 7 is a pillar, and 8 is a beam. However, when the beam 8 is an extremely short span beam, the present invention defines the X-shaped bar 11 inside the clear span at the end of this X-shaped bar 11. The parallel portion 12 was formed.

The specification of the parallel portion 12 is such that its length l _h is within the range of l _h : D / 3 to D / 2 with respect to the beam beam D.

Further, a horizontal reinforcing bar 13 is arranged in the parallel portion 12. In the figure, 10 is parallel bar arrangement as before, 14
Is the hoop muscle.

FIG. 5 shows a mode of the lateral reinforcing bar 13, which is X
Items such as (a) to (b) can be selected depending on the state of the shape-reinforcing bar 11, and the closed type (a) or (d) has a parallelogram shape or a trapezoidal shape.

Further, the reinforcing bar joint 9 of the X-shaped bar 11 and the parallel bar 10 is used as a column / beam joint inner joint as shown in FIG. 6 and a beam end joint as shown in FIG. It is possible that In principle, the column-beam joint inner joint shown in FIG. 6 is used, and when this is not possible, the beam end joint shown in FIG. 7 is used.

As for the prefabricated reinforcing bar assembly, as can be seen from FIGS. 1 and 3, the parallel portion 12 of the X-shaped reinforcing bar 11 and the parallel reinforcing bar 10 are close to each other. Easy to fix.

FIG. 8 shows an example in which the present invention is applied to a column member. In this case, the conventional column prefabricated reinforcing bar system can be used.

[0020]

As described above, the X-shaped bar arrangement method of the present invention improves the fracture property and improves the bending reinforcing effect of the X-shaped bar when the X-shaped bar is arranged in a short span. Let
Furthermore, the prefabricated reinforcing bar method (reinforcing bar pre-assembly method) can be easily applied.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an X-shaped bar arrangement method of the present invention.

FIG. 2 is a plan view showing an embodiment of an X-shaped bar arrangement method of the present invention.

FIG. 3 is a sectional view taken along line aa of FIG. 1;

FIG. 4 is a sectional view taken along line bb of FIG. 1;

FIG. 5 is an explanatory view showing a mode of a lateral reinforcing bar.

FIG. 6 is a side view showing an example of a place of a reinforcing bar joint.

FIG. 7 is a side view showing another example of a place of a reinforcing bar joint.

FIG. 8 is an explanatory diagram showing application to a pillar member.

FIG. 9 is a side view and a plan view showing a conventional example.

FIG. 10 is a side view and a plan view showing another conventional example.

FIG. 11 is a plan view showing an example of an outer peripheral tube / core wall frame structure.

FIG. 12 is a plan view showing another example of the outer peripheral tube / core wall frame structure.

[Explanation of symbols]

 1 ... Tube frame 2 ... Core wall 3 ... Standard frame 4 ... Eccentric beam frame 5 ... Wall type frame frame 6 ... Boundary beam 7 ... Column 8 ... Beam 9 ... Reinforcing bar joint 10 ... Parallel bar 11 ... X-shaped bar 12 ... Parallel part 13… Horizontal reinforcement 14… Hoop

Claims (2)

[Claims] 1. An X-shaped bar arrangement method characterized in that as an X-shaped bar, there is a parallel portion formed at the end of the X-shaped bar inside the clear span, and a horizontal reinforcing bar is arranged in this parallel portion. . 2. The length l _h of the parallel portion of the X-shaped reinforcing bar has a specification of l _h : D / 3 to D / 2 with respect to the beam beam D.
The X-shaped bar arrangement method described.