JP2923927B2 - Mounting method of shear reinforcement - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of mounting a shear reinforcing bar under a multi-step reinforcing bar.

[0002]

2. Description of the Related Art A reinforced concrete structure is composed of reinforced concrete and concrete. FIG. 9 shows a reinforced concrete beam, 101 is concrete, 103 is a main reinforcing bar, 105 is a main reinforcing bar arranged in a direction orthogonal to the main reinforcing bar 103, and 107 is a shear reinforcing bar. In such a reinforced concrete structure, the bending moment resists the compressive strength of the concrete 101 and the tensile strength of the main reinforcing bar 103, and the shearing force resists the shear resistance of the concrete 101 and the shear reinforcing bar 107. Resistance due to tensile strength. In order for the shear reinforcing bar 107 to exhibit a sufficient load-bearing capacity, it is necessary to securely fix the end portions.

[0003] A shear reinforcing reinforcing bar is formed by connecting a semi-circular hook-shaped reinforcing bar 109 as shown in FIG. 10 to a main reinforcing bar 105 by a coupler 111 as shown in FIG. In addition, a right-angled hook-shaped reinforcing bar 109a as shown in FIG. 12 is used as the shear reinforcing bar 107.

[0004] By the way, in the case where a force larger than expected in the design acts due to a large earthquake or the like and the concrete outside the main reinforcing bar peels off, the semicircular hook-shaped reinforcing bar 109 is most excellent, and the Great Hanshin Earthquake. This shape is also defined in the reference and the like created thereafter.

[0005]

However, the use of the semi-circular hook-shaped reinforcing bar 109 is excellent in terms of load-bearing capacity, but has the following problems, and has a small structure in which the reinforcing bars are assembled one by one. It is hard to be used for anything other than the object, and for large structures, it is mainly a right-angle hook-shaped reinforcing bar 109.
a has been adopted.

(A) To attach the shear reinforcement 107 using the semicircular hook-shaped reinforcing bar 109 after the main reinforcing bars 103 and 105 have been assembled, use an expensive threaded reinforcing bar, and change the end into a semicircular hook shape. The processed reinforcing bar 109 is connected between the main reinforcing bars 105 by a coupler 111. However, in the case of a multi-stage reinforcing bar, it is difficult to position the shear reinforcing reinforcing bar at a portion connected by the coupler due to an arrangement error of the main reinforcing bar.

(B) There is also a method in which a shear reinforcing bar is inserted between the main bars 103 and 105 and then processed into a semicircular hook shape by a bending machine. And it is difficult to secure sufficient quality such as cracks in the shear reinforcement.
In addition, it takes time to set a machine such as a bending machine, and the workability is poor. Further, the bending machine has been developed only for a reinforcing bar having a diameter of 16 mm, and a reinforcing bar having a large diameter cannot be used.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a method of mounting a shear reinforcing steel bar which is excellent in workability even in a large structure or the like and has good quality. It is in.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention provides a step of arranging a lower shear reinforcing bar, attaching a coupler to the lower shear reinforcing bar, A step of arranging a pipe at the upper end, a step of arranging a multi-step reinforcing bar around the pipe, and a step of removing the pipe and coupling the lower shear reinforcing bar and the upper shear reinforcing bar with the coupler. A method for mounting a shear reinforcing bar, comprising:

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of mounting a shear reinforcing bar under a multi-step reinforcing bar according to an embodiment of the present invention will be described below with reference to FIGS. First, as shown in FIG.
After the lower main reinforcing bars 1 and 3 are arranged, the lower shear reinforcing bars 5 are arranged and concrete 7 is poured. The lower-side shear reinforcing bar 5 and the later-described upper-side shear reinforcing bar 17 are obtained by dividing a screw bar into two and processing the ends into semicircular hooks at a processing site.

Next, as shown in FIG. 2, a coupler 9 is screwed into the lower shear reinforcing steel 5, and the lower shear reinforcing steel 5 is tightened.
So that the upper edge of is exposed. Then, a hollow cylindrical steel pipe 11 having both ends opened is mounted on the coupler 9. Since the inner diameter of the steel pipe 11 is slightly larger than the outer diameter of the lower shear reinforcement 5, the upper end of the lower shear reinforcement 5 is inserted into the steel pipe 11. FIG. 3 is an enlarged view near the coupler 9 in FIG.

Next, as shown in FIG.
15 are arranged in multiple stages (for example, three stages), and after removing the steel pipe 11 as shown in FIG.
After the upper shear reinforcing bar 17 is arranged so that the lower end of the lower shear reinforcing bar 5 and the upper end of the lower shear reinforcing bar 5 match, the coupler 9 is moved upward, and the lower shear reinforcing bar 5 and the upper shear The reinforcing reinforcing bar 17 is connected. FIG.
6 is an enlarged view near the coupler 9 in FIG.

Next, as shown in FIG.
Is installed. 21 is a concrete joint. FIG.
FIG. 3 is a schematic view showing the arrangement of upper main reinforcing bars 13 and 15, lower main reinforcing bars 1 and 3, and shear reinforcing bars.

As described above, according to the present embodiment, the following effects can be obtained. By steel pipe 11,
Since the space in which the upper shear reinforcing bar 17 is inserted can be secured, the upper shear reinforcing bar 17 can be easily arranged and joined at a predetermined position after the arrangement of the upper main reinforcing bars 13 and 15 is completed. The upper shear reinforcing steel 17 may be passed through between the upper main reinforcing bars 13 and 15 assembled in multiple stages, so that the upper shear reinforcing steel 17 can be surely arranged at a predetermined place. It is processed into a semicircular shape as specified at the processing site, and a shear-reinforced reinforcing bar excellent in quality can be used. When the upper main reinforcing bars 13 and 15 are attached, only the vertical steel pipe 11 is present, so that the upper main reinforcing bars 13 and 15 can be easily arranged and workability is improved.

In place of the steel pipe 11, a pipe made of another material such as plastic can be used. Further, the steel pipe 11 is not limited to a cylindrical shape, but may be a prismatic shape. Further, a member having only a hollow end portion may be used. In addition, the lower shear reinforcement 5 and the upper shear reinforcement 11 are:
The threaded portion may be provided only at the portion connected by the coupler.

[0016]

As described in detail above, according to the present invention, it is possible to provide a method of mounting a shear reinforcing steel bar which is excellent in workability even in a large structure or the like and has good quality.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a method of mounting a shear reinforcing bar.

FIG. 2 is an explanatory view showing a method of mounting a shear reinforcement bar.

FIG. 3 is an enlarged view of the vicinity of the coupler 9 in FIG. 2;

FIG. 4 is an explanatory view showing a method of mounting a shear reinforcement bar.

FIG. 5 is an explanatory view showing a method of mounting a shear reinforcing bar.

FIG. 6 is an enlarged view of the vicinity of the coupler 9 of FIG.

FIG. 7 is an explanatory view showing a method of mounting a shear reinforcing bar.

FIG. 8 is a diagram showing the arrangement of reinforcing bars.

FIG. 9 shows a reinforced concrete beam.

FIG. 10 is a diagram showing a semicircular hook-shaped reinforcing bar 109;

FIG. 11 is a diagram showing attachment of a shear reinforcing bar.

FIG. 12 is a view showing a right-angle hook-shaped reinforcing bar 109a.

[Explanation of symbols]

 1, 3 ... lower main reinforcing bar 5 ... lower shear reinforcing bar 9 ... coupler 11 ... pipe 17 ... upper shear reinforcing bar 13, 15 ... upper reinforcing bar 7, 19 ... …concrete

Claims (3)

(57) [Claims] A step of arranging a lower shear reinforcing bar, a step of attaching a coupler to the lower shear reinforcing bar, and arranging a pipe at an upper end of the lower shear reinforcing bar; And a step of removing the pipe and connecting the lower shear reinforcing steel and the upper shear reinforcing steel by the coupler. A method of mounting a shear reinforcing steel. 2. The method according to claim 1, wherein the lower and upper shear reinforcing bars are semicircular hook-shaped reinforcing bars. 3. The method according to claim 1, wherein the lower shear reinforcing steel and the upper shear reinforcing steel have a threaded portion.