JPH05230874A - Reinforced concrete column shearing reinforcing method - Google Patents

Abstract

PURPOSE:To enhance the reinforcement arranging work efficiency and obviate welders so as to shorten the construction period and reducing the cost by obviating the shearing reinforcing work of a steel-framed reinforced concrete column at its column-beam joint parts at a construction site. CONSTITUTION:Plate like hoops 1 formed by bending band iron plates of thickness and width with the required design strength into arrow mark shape are welded to four corners of the column-beam joint part of a steel framed column A. After completing steel frame erection, the specified number of column main reinforcements a, a' are inserted into each plate like hoop 1 welded to each of four corners of the steel framed column A, and the respective main reinforcements a, a' are brought into contact with the plate like hoop 1. Closing type hoop reinforcements 2 are further disposed in such a way as to surround column main reinforcements a, a' excluding the ones at the column-beam joint parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for shearing and reinforcing a reinforced concrete column in a steel-framed reinforced concrete column-beam joint.

[0002]

2. Description of the Related Art Conventionally, a method of shearing a reinforced concrete column in a steel-framed reinforced concrete column-beam joint has been described in FIG.
And the method shown in FIG. FIG. 4 (a) is a plan sectional view showing a shear reinforcement method of a reinforced concrete column at a steel-reinforced concrete column-beam joint, FIG. 4 (b) is a plan view of a split hoop used for shear reinforcement of the column, and FIG. 5 is the same. It is a longitudinal cross-sectional view of a pillar. After the steel frame has been erected, the steel-framed reinforced concrete columns are arranged with three column main bars a and a ′ at the four corners of the steel column A, and the column main bar a excluding the column-beam joints is first Surrounding a ′, the square hoop muscle 2 is arranged to perform shear reinforcement. Next, the beam-column joint is divided into webs B'of the steel beams B in four directions that intersect the steel columns in advance, and the hoop reinforcement 1 '
The through holes B ₁ are drilled at predetermined intervals at the bar arrangement positions, and the long piece 1′a of the L-shaped split hoop muscle 1 ′ is inserted into each of the through holes B ₁ to form each split hoop muscle. The long piece 1'a and the single piece 1'b of 1'are temporarily bound together with both ends overlapping, and the overlapped temporary binding portions are weld-joined to form a square hoop. By arranging the square-shaped hoop formed by the streak 1'and surrounding the column main bars a and a'of the beam-column joint, the column main bars a and a'and the core concrete c are constrained, and the beam-column joint Shear reinforcement is performed by preventing the expansion of the width of concrete cracks.

[0003]

In the conventional shear reinforcement method for a reinforced concrete column in a steel-frame-reinforced-column-column-joint, the through holes B _{1 formed} in the web B ′ of the steel beam B are replaced by L Insert the long piece 1'a of the character-shaped split hoop muscle 1'to insert the long piece 1'of each split hoop muscle 1 '.
a and a piece 1'b of both ends are temporarily bound together in an overlapping state,
The overlapping temporary binding portions are weld-joined to form a square hoop, and the square hoop formed by the split hoop muscle 1'is laid out in the same manner as described below to form the main pillar a, a of the beam-column joint. 'Is surrounded by shear reinforcement. Therefore, many work steps are complicated and troublesome and work efficiency is poor. Moreover, there is a problem that a welding person is separately required for the welding work. The present invention has been proposed in view of the above problems of the prior art, the object of which is to eliminate the need for shear reinforcement work of the column in the steel frame reinforced concrete column beam joint at the work site. The purpose of the present invention is to provide a method for shearing reinforcement of reinforced concrete columns, which makes the work of arranging work more efficient and does not require welding, thus shortening the construction period and reducing costs.

[0004]

DISCLOSURE OF THE INVENTION The present invention has achieved the above object in a method of shearing a reinforced concrete column in a steel-framed reinforced concrete column-beam joint. Therefore, the plate-shaped hoops formed by bending the steel strip with a thickness and width having the required design strength into an arrow shape are welded to the four corners of the beam-column joints of the steel column, respectively, and after the steel frame construction is completed, Inserting a predetermined number of column main bars in each plate-shaped hoop welded to the four corners of the steel column, abutting each column main bar to the plate-shaped hoop, and further surrounding the column main bars other than the beam-column joints. Arrange closed hoop muscles

[0005]

According to the present invention, a plate-shaped hoop formed by bending a steel strip having a thickness and width having a required design strength 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 bar and the core concrete, and prevents the shear crack width of the column-beam joint concrete from expanding, thereby reinforcing the shear of the reinforced concrete column at the steel-frame reinforced concrete column-beam joint. Therefore, after the steel frame erection is completed, insert a predetermined number of column main bars in each plate hoop welded to the four corners of the steel frame column, abut the corner main bar to the tip protrusion of the plate hoop, and tip side While the inner main bar is in contact with the refraction point and the main bar other than the beam-column joint is surrounded and the closed hoop bar is reinforced, shear reinforcement of the column becomes possible, and the beam-column joint at the site. No need for shear reinforcement work for reinforced concrete columns.

[0006]

EXAMPLE A method for shearing and reinforcing a reinforced concrete column in a steel-framed reinforced concrete column-beam joint of the present invention will be described. As shown in Fig. 3, the plate-shaped hoop 1 used in the shear reinforcement method for reinforced concrete columns is formed by bending an iron strip with a thickness and width that has the required design strength into an arrow shape. Of the tip protrusion 1a at the position where it abuts the main bar a, and at the bending point 1c at the position where it abuts the innermost main bar a ', bends at 135 degrees. Both sides 1 having both ends 1b between them and projecting outward from both refraction points 1c
configured to have d. The plate-shaped hoops 1 are located at the four corners of the beam-column joint of the steel-framed column A at the steel frame factory so that the tip projections 1a of the plate-shaped hoops 1 are brought into contact with the column main bars a of the corners, and A plurality of plate-shaped hoops 1 are welded to the steel column flange A ′ by abutting the ends of the side edges 1d of the plate-shaped hoop 1 or by fillet welding at predetermined intervals in the height direction. The outer ends of both side edges 1d of each plate-shaped hoop 1 are welded to the flange A ′ of the steel column A.

1 and 2 are a plan sectional view and a longitudinal sectional view showing an embodiment of the method for shearing reinforcement of a reinforced concrete column in a steel-framed reinforced concrete column-beam joint of the present invention. When arranging a steel reinforced concrete column by the method of the present invention, after constructing the steel column A and intersecting the steel beams B in the four directions, each plate shape welded to the four corners of the steel column A The three main pillars a and a'are inserted into the hoop 1, the corner main bars a are brought into contact with the tip projections 1a of the plate-shaped hoop 1, and the inner main bars a are attached to the bending points 1c of the plate-shaped hoop 1. 'Abut and place. Furthermore, for steel column A,
The closed type hoop muscles 2 are arranged around the column main bars a and a ′ excluding the beam-column joints. In this embodiment, three column main reinforcements a and a'are inserted into each plate-shaped hoop 1. However, when the number of column main reinforcements a and a'is three or more, the bending point 1c and the tip projection 1 are formed.
The increased inner main bar a ′ may be brought into contact with the tip side 1b between a and disposed.

The plate-shaped hoop 1 is formed of a band iron plate having a thickness and width having a required design strength, and a plurality of the plate-shaped hoops are welded to the flange A'of the steel frame column A at predetermined intervals. Restrain the main bars a, a'and the core concrete c,
Moreover, the shear crack width of the concrete-column joints is prevented from expanding and the reinforcement of the reinforced concrete columns in the steel-framed reinforced concrete column-column joints is strengthened. Therefore, after the steel frame construction is completed, the three column main bars a and a ′ are inserted into the respective plate-shaped hoops 1 welded to the four corners of the steel-framed column A, and the corners are inserted into the tip projections 1 a of the plate-shaped hoop 1. The main bar a is brought into contact, the inner main bar a'is brought into contact with the inflection point 1c of the plate-shaped hoop 1, the column main bars a and a'excluding the beam-column joint are surrounded, and the closed hoop line 2 is arranged. This makes it possible to reinforce the columns by shearing and eliminates the need for on-site shear reinforcement work for reinforced concrete columns at beam-column joints.

[0009]

EFFECTS OF THE INVENTION According to the present invention, the plate-shaped hoop restrains the main reinforcement of the column and the core concrete, and prevents the shear crack width of the concrete of the beam-column joint from expanding. After the steel frame construction is completed, insert a predetermined number of column main bars into each plate hoop welded to the four corners of the column steel frame at the steel frame factory, and add the corner reinforcement to the tip projection of the plate hoop. The shear reinforcement of the column can be performed by abutting the main reinforcement, abutting the inner main reinforcement on the tip side and the inflection point, surrounding the main reinforcement other than the beam-column joint and arranging the closed hoop reinforcement. Therefore,
Shear reinforcement work for reinforced concrete columns at beam-column joints at the site is simplified, work efficiency of shear reinforcement is improved, and it is possible to shorten the construction period and cost.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional view of FIG.

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

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

FIG. 5 is a vertical cross-sectional view of FIG.

[Explanation of symbols]

 A Steel column B B Steel beam a Column main muscle 1 Plate hoop 2 Closed hoop muscle

Claims (1)

[Claims] 1. A method of shearing a reinforced concrete column in a steel-reinforced reinforced concrete column-beam joint, wherein a plate-shaped hoop formed by bending a strip steel plate having a required design strength in a thickness and width into an arrow shape is used. After welding each of the four corners of the beam-column joint, and after completing the steel frame construction, insert a predetermined number of column main bars into the plate hoops welded to the four corners of the steel column, and insert each main bar into the plate hoop. A method for shearing reinforcement of a reinforced concrete column, characterized in that the closed type hoop reinforcement is arranged by surrounding the column main bars other than the column-beam joints.