JP2813264B2 - Shear reinforcement method for reinforced concrete columns - 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 shear-reinforcing a reinforced concrete column at a steel-column reinforced concrete beam-column joint.

[0002]

2. Description of the Related Art Conventionally, a method of shear-reinforcing a reinforced concrete column at a steel-column reinforced concrete beam-column joint is shown in FIG.
And the method shown in FIG. FIG. 4A is a plan sectional view showing a method of shear reinforcement of a reinforced concrete column at a steel beam reinforced concrete beam-column joint, FIG. 4B is a plan view of a split hoop used for shear reinforcement of the column, and FIG. It is a longitudinal section of a pillar. After the completion of the steel frame construction, three column main reinforcements a and a 'are arranged at the four corners of the steel column A, and the column main reinforcement a of the column portion except for the beam-column joint is firstly arranged after the completion of the steel frame construction. A square hoop streak 2 is arranged around a ′ to reinforce shearing. Next, the beam-to-column joint is split into webs B 'of the steel beams B in four directions intersecting the steel columns in advance and the hoop bars 1'.
Of the reinforcement position leave drilled through holes B ₁ at predetermined intervals, into the through hole B ₁ each by inserting a long piece 1'a of the L-shaped split hoop 1 ', the split hoop The 1 'long piece 1'a and the single piece 1'b are temporarily tied together in an overlapping state, and the overlapped temporary tied parts are welded and joined to form a square-shaped hoop, and so on. By arranging a square-shaped hoop formed by the bars 1 'and surrounding the column main bars a and a' of the column-beam joint, the column main bars a and a 'and the core concrete c are restrained, and the column-beam joint is formed. Shear reinforcement is achieved by preventing the expansion of the shear crack width of concrete.

[0003]

In [0006] The shear reinforcement method of the conventional steel reinforced concrete beam-column reinforced concrete columns at the junction, the through hole B ₁ each which had been drilled in the web B 'of the steel beam B, L Insert the long piece 1'a of the U-shaped split hoop muscle 1 'and insert the long piece 1' of each split hoop muscle 1 '
a and the both ends of the single piece 1'b are temporarily bound in an overlapping state,
The overlapped temporary binding portions are welded and joined to form a square-shaped hoop, and similarly, the square-shaped hoop formed by the split hoop bar 1 'is arranged in the same manner to reinforce the column main bars a, a of the beam-column joint. 'To provide shear reinforcement. Therefore, the number of work steps is complicated and troublesome, and work efficiency is poor. In addition, there is a problem that a welder is separately required for welding work. The present invention has been proposed in view of the above-mentioned problems of the prior art, and the object thereof is to eliminate the need for shear reinforcement work on columns at steel-frame reinforced concrete beam-column joints at work sites. It is another object of the present invention to provide a method of shear reinforcement of a reinforced concrete column, which makes it possible to shorten the construction period and reduce the cost by making the work of arranging a bar efficient and eliminating the need for a welder.

[0004]

SUMMARY OF THE INVENTION The present invention has achieved the above object in a method for shear reinforcement of a reinforced concrete column at a joint of a steel reinforced concrete column and beam. For this reason, plate-shaped hoops formed by bending an iron plate of thickness and width having the required design strength in the shape of an arrow are welded to the four corners of the beam-column joint of the steel column, and after completion of the steel frame construction, A predetermined number of column main reinforcements are inserted into the respective plate-shaped hoops welded to the four corners of the steel column, each column main reinforcement abuts on the plate-shaped hoop, and further surrounds the column main reinforcement other than the column-beam joint. Arrange closed hoop muscles

[0005]

According to the present invention, a plate-shaped hoop formed by bending an iron strip having a required design strength and a thickness and a width into an arrow shape is welded to each of the four corners of a beam-column joint of a steel column. Therefore, the plate-shaped hoop restrains the column main reinforcement and the core concrete, and prevents the shear crack width of the beam-column joint concrete from expanding, thereby strengthening the shear strength of the reinforced concrete column at the steel-frame reinforced concrete beam-column joint. Therefore, after the completion of the steel frame construction, a predetermined number of column main reinforcements are inserted into the respective plate-shaped hoops welded to the four corners of the steel column, and the main reinforcements of the corners are brought into contact with the tip projections of the plate-shaped hoops, and the tip side The inner reinforcement is brought into contact with the bending point, and the reinforcement of the column can be strengthened by arranging the closed hoop reinforcement surrounding the column reinforcement other than the column-beam joint, and the column-beam joint at the site No need for shear reinforcement work on reinforced concrete columns.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of shear reinforcement of a reinforced concrete column at a steel beam reinforced concrete beam-column joint according to the present invention will be described. As shown in FIG. 3, a plate-shaped hoop 1 used in the method of shear reinforcement of a reinforced concrete column is formed by bending an iron plate having a required design strength into a thickness and a width in an arrow shape and forming a corner of the reinforced concrete column. Bent at 90 degrees at the tip projection 1a at a position where it contacts the main bar a, and further bent at 135 degrees at a refraction point 1c at a position where it contacts the innermost main bar a '. Both sides 1 having both front end sides 1b therebetween and projecting outward from both refraction points 1c
d. The plate-shaped hoops 1 are located at the four corners of the beam-column joint of the steel column A at the steel factory, so that the tip protrusions 1a of the respective plate-shaped hoops 1 are in contact with the column main reinforcements a of the corners. A plurality of plate-shaped hoops 1 are welded to the steel column flange A 'at predetermined intervals along the height direction by abutting the ends of the side edges 1d of the plate-shaped hoops 1 or by fillet welding. The outer ends of both sides 1d of each plate-shaped hoop 1 are welded to the flange A 'of the steel column A.

FIGS. 1 and 2 are a plan sectional view and a longitudinal sectional view, respectively, showing an embodiment of a method of shear-reinforcing a reinforced concrete column at a steel-column reinforced concrete beam-column joint according to the present invention. In the case of arranging the steel reinforced concrete columns according to the method of the present invention, the steel columns A are erected, and after the steel beams B are crossed in the four directions, the respective plate-shaped members are welded to the four corners of the steel columns A. The three main pillars a and a ′ are inserted into the hoop 1, and the main pillar a of the corner is brought into contact with the tip projection 1 a of the plate-shaped hoop 1, and the inner major bar a is bent at the refraction point 1 c of the plate-shaped hoop 1. 'And abut it. Furthermore, for steel column A,
The closed-type hoop bar 2 is arranged so as to surround the column main bars a and a 'excluding the beam-column joint. In this embodiment, three column main bars a and a 'are inserted into each plate-shaped hoop 1. However, when the column main bars a and a' are three or more, the bending point 1c and the tip protrusion 1 are provided.
What is necessary is just to arrange the increased inner main bar a ′ in contact with the tip side 1b between the a.

The plate-shaped hoop 1 is formed of a steel strip having a thickness and a width having a required design strength and is welded to the flange A 'of the steel column A at a predetermined interval. Restrain main bars a, a 'and core concrete c,
In addition, by reinforcing the shear crack width of the beam-column joint, the shear reinforcement of the reinforced concrete column at the steel-frame reinforced concrete beam-column joint is prevented. Therefore, after completion of the steel frame construction, the three main pillars a and a ′ are inserted into the respective plate-shaped hoops 1 welded to the four corners of the steel column A, and the corners are inserted into the tip protrusions 1a of the plate-shaped hoop 1. The main bar a is abutted, the inner main bar a ′ abuts on the bending point 1c of the plate-shaped hoop 1, and the closed hoop bar 2 is arranged so as to surround the column main bars a and a ′ excluding the beam-column joint. This makes it possible to reinforce the columns by shearing, eliminating the need for on-site shear reinforcement of reinforced concrete columns at beam-column joints.

[0009]

According to the present invention, the plate-shaped hoop restrains the main column and the core concrete, and prevents the width of the shear crack of the concrete at the beam-column joint, thereby preventing the width of the concrete from increasing at the steel-column reinforced concrete beam-column joint. After completion of the steel frame construction, a predetermined number of column main bars are inserted into each of the plate-shaped hoops welded to the four corners of the column steel frame at the steel-frame factory, and corners are formed at the tip protrusions of the plate-shaped hoops. The main reinforcement is abutted, the inner main reinforcement is in contact with the tip side and the bending point, and the closed main hoop reinforcement is arranged around the column main reinforcement other than the beam-column joint, thereby reinforcing the column by shearing. Therefore,
The on-site shear reinforcement work of reinforced concrete columns at beam-to-column joints is simplified, the work efficiency of shear reinforcement is improved, and the construction period and cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan sectional view showing one embodiment of a method for shear reinforcement of a reinforced concrete column according to the present invention.

FIG. 2 is a longitudinal sectional view of FIG.

FIG. 3 is a perspective view showing one embodiment of a plate-shaped hoop used in the present invention.

FIG. 4 (a) is a plan sectional view showing an example of a conventional method for shear reinforcement of a reinforced concrete column, and FIG. 4 (b) is a plan view of a split hoop used in the conventional method.

FIG. 5 is a longitudinal sectional view of FIG.

[Explanation of symbols]

 A steel column B steel beam a pillar main bar 1 plate hoop 2 closed hoop bar

Claims (1)

(57) [Claims] 1. A method of shear-reinforcing a reinforced concrete column at a steel-reinforced reinforced concrete column-to-column joint, wherein a plate-shaped hoop formed by bending a strip having a required thickness and a width having a required design strength into an arrow shape is formed. After welding is completed at the four corners of the beam-column joint, after completion of the steel frame construction, a predetermined number of column main reinforcements are inserted into the respective plate-shaped hoops welded to the four corners of the steel column, and each main reinforcement is formed into a plate-shaped hoop. A reinforcing reinforcement for a reinforced concrete column, characterized in that a closed-type hoop reinforcement is arranged surrounding the column main reinforcement other than the column-beam joint.