KR-102964098-B1 - SHEAR REINFORCING BAR AND CONSTRUCTION METHOD THEREOF

KR102964098B1KR 102964098 B1KR102964098 B1KR 102964098B1KR-102964098-B1

Abstract

The present invention relates to a shear reinforcement device for reinforcing the joint between a column and a slab, and a method for constructing the same. It is characterized by comprising a first reinforcement section formed by bending the rebar upward and downward, a second reinforcement section installed parallel to one side of the first reinforcement section with its upper ends joined together and formed by bending the rebar upward and downward, and an auxiliary reinforcement section joined between the lower ends of the first reinforcement section and the second reinforcement section. Accordingly, the present invention secures performance equivalent to or better than conventional shear reinforcement methods and improves constructability by seating the lower reinforcement in a continuous hook shape rather than wrapping the hook-shaped rebar around the slab reinforcement. Furthermore, since the general rebar is pre-fabricated in a factory using general processing machinery, it provides the effect of being advantageous in terms of processability and construction costs compared to existing shear reinforcement devices.

Inventors

유호원
안영태
이범식
김민준

Assignees

한국토지주택공사

Dates

Publication Date: 20260512
Application Date: 20241016

Claims (7)

As a shear reinforcement hardware for reinforcing the joint between a column and a slab, A first reinforcing bar section (10) formed by repeatedly bending the reinforcing bar upward and downward; A second reinforcing bar section (20) formed by repeatedly bending reinforcing bars upward and downward, with the upper ends joined together and installed parallel to one side of the first reinforcing bar section (10); and A shear reinforcement hardware characterized by including one or more auxiliary reinforcing bars (30) that are coupled between the lower ends of the first reinforcing bar section (10) and the second reinforcing bar section (20) to maintain the lower end spacing of each of the first reinforcing bar section (10) and the second reinforcing bar section (20).
In Article 1, The above first reinforcing bar section (10) is, A plurality of first reinforcing bars installed in the vertical direction and spaced apart at predetermined intervals; A first upper reinforcing bar formed by bending between the upper ends of the first reinforcing bars and joined to the second reinforcing bar portion (20) by spot welding; A first lower reinforcing bar formed by bending between the lower ends of the first reinforcing bars; and A shear reinforcing steel member characterized by including a first connecting reinforcing bar extended from one end of the first reinforcing bar.
In Article 1, The above second reinforcing bar section (20) is, Multiple second reinforcing bars installed in the vertical direction and spaced apart at predetermined intervals; A second upper reinforcing bar formed by bending between the upper ends of the second reinforcing bars and joined to the first reinforcing bar portion (10) by spot welding; A second lower reinforcing bar formed by bending between the lower ends of the second reinforcing bars; and A shear reinforcing steel member characterized by including a second connecting reinforcing bar extended from one end of the second reinforcing bar.
In Article 1, The above auxiliary reinforcing bar section (30) is characterized by being joined by spot welding between the lower ends of the above first reinforcing bar section (10) and the above second reinforcing bar section (20).
As a shear reinforcement hardware for reinforcing the joint between a column and a slab, A third reinforcing bar section (40) formed by repeatedly bending the reinforcing bar laterally and downwardly and extending integrally; and A shear reinforcing steel member characterized by including one or more connecting reinforcing bar sections (50) that are joined so as to maintain a gap between the lower ends of the third reinforcing bar sections (40).
In Article 5, The above third reinforcing bar section (40) is, Multiple third reinforcing bars installed in the vertical direction and spaced apart at predetermined intervals; A third upper reinforcing bar formed by laterally bending between the upper ends of the third reinforcing bars; and A shear reinforcing steel characterized by including a third lower reinforcing bar formed by bending downward between the lower ends of the third reinforcing bars.
A method for constructing a shear reinforcement of claim 1 or claim 5, wherein Step of arranging the lower main reinforcement of the slab; A step of placing shear reinforcing steel on the lower main reinforcement of the slab or on the support of the slab; Step of arranging the upper main reinforcement of the above slab; and A method for constructing a shear reinforcement, characterized by including the step of connecting the upper end of the shear reinforcement to the upper main reinforcement of the slab.

Description

Shear Reinforcing Bar and Construction Method Thereof The present invention relates to a shear reinforcing device and a method of constructing the same, and more specifically, to a shear reinforcing device for reinforcing the joint between a column and a slab and a method of constructing the same. Reinforced concrete is a concrete structure in which reinforcing bars are placed to strengthen concrete, which has weak tensile strength. When a load is applied to a reinforced concrete structure, compressive, tensile, and shear stresses occur in combination in each part of the concrete structure; therefore, shear reinforcement structures are applied to reinforced concrete structures to increase resistance to loads, particularly resistance to shear failure. Conventionally, a reinforcement system for a reinforced concrete slab embedded within concrete to reinforce the slab is disclosed, comprising a reinforced concrete slab having upper reinforcement for slab reinforcement and lower reinforcement provided at a certain distance below the upper reinforcement, and a shear reinforcement fixed vertically across the space between the upper reinforcement and the lower reinforcement to resist shear of the slab, wherein the upper part of the shear reinforcement is supported by the upper reinforcement and the lower part of the shear reinforcement is supported by the lower reinforcement so that the shear reinforcement is mounted on the upper reinforcement and fixed vertically. In particular, a flat slab structure is a structural system in which the floor is constructed solely of slabs without beams and the load from the slabs is directly transferred to the columns. Since excessive stress concentration occurs around the columns in flat slab structures, there is a high risk of the slabs undergoing punching shear failure; therefore, to suppress shear failure, the joints between the columns and the slabs are typically shear reinforced in flat slab structures. Traditional shear reinforcement methods include expanding the cross-section by constructing drop panels and capitals around columns; however, this method suffers from poor constructability, such as the need to install formwork for forming the drop panels or capitals. Consequently, a method of increasing shear strength by installing shear reinforcements at the joints with columns during the slab reinforcement process is currently being primarily applied. Figures 1 to 4 illustrate various methods of shear reinforcement using conventional shear reinforcement components. In addition, unlike frame structures where slab loads are transferred to columns through beams, flat-slab structures are beam-free structures where slab loads are transferred directly to columns, concentrating shear forces on the slabs around the columns. While concrete primarily resists factored shear loads, reinforcement with steel is required if the load exceeds the resistance limit. Typically, a single column in an underground parking garage supports a slab load in the range of 5.5m × 8.2m, and for the roof level, the common method of shear reinforcement is to wrap hook-shaped rebar around the slab reinforcement. However, this has the disadvantage of being complex and cumbersome for on-site work. As shown in FIGS. 5 to 8, existing products such as (a) a reinforced concrete truss method, (b) a stud rail method, (c) a reinforced concrete truss stud method, and (d) a steel reinforcement method were developed by improving general shear reinforcement. However, although construction convenience was improved compared to general methods, there were problems that it was not easy to apply due to additional installation of upper and lower chords, use of special hardware, complex processing, increased construction load, and increased cost. FIG. 1 is a diagram showing the installation state of a conventional shear reinforcement. Figure 2 is a diagram showing the construction state of a conventional shear reinforcement. FIG. 3 is a front view showing the installation state of a conventional shear reinforcement. Figure 4 is a diagram showing the damaged state of a conventional shear reinforcement. FIG. 5 is a schematic diagram showing an example of a conventional shear reinforcement. FIG. 6 is a schematic diagram showing another example of a conventional shear reinforcement. FIG. 7 is a schematic diagram showing another example of a conventional shear reinforcement. FIG. 8 is a schematic diagram showing a modified example of a conventional shear reinforcement. FIG. 9 is a configuration diagram showing a shear reinforcement steel member according to one embodiment of the present invention. FIG. 10 is a configuration diagram showing the usage state of a shear reinforcement steel according to one embodiment of the present invention. FIG. 11 is a perspective view showing the usage state of a shear reinforcement steel member according to one embodiment of the present invention. FIG. 12 is a plan view showing the usage state of