KR101104541B1 - Shear reinforcement component for a slab-column connection and shear reinforcement structure using the same - Google Patents

Abstract

The present invention discloses a shear reinforcement for a slab-column joint and a shear reinforcement structure using the same. The shear reinforcing structure is disposed on each upper portion at regular intervals along its length and includes an upper fixing portion 10 including a first arc portion 11 forming a channel 11a for the corresponding upper reinforcing bar 42 of the slab. ; A lower fixing part 20 including a second circular arc part 21 on one side and a third circular arc part 22 on the other side, which are arranged in a form staggered with each other on the left and right sides of the lower part at predetermined intervals along the length; And connecting the corresponding portions of the second circular arc part 21 and the third circular arc part 22 on both sides of the first arc part 11 of the upper fixing part 10 and the lower fixing part 20. Two adjacent column bodies (30a) are arranged in parallel with each other in front and side parallel to each other; the upper fixing portion 10, the lower fixing portion 20 and the intermediate shear portion ( 30 is formed in a single body, each of the second arc portion 21 and the third arc portion 22 of the lower fixing portion 20 in the width direction from the corresponding column body 30a of the intermediate shear portion 30 It is characterized by protruding more than 3d (d: diameter of the reinforcement or shear reinforcement) to the outside.

Slab, Column, Shear Reinforcement, Shear Reinforcement Structure

Description

Shear reinforcement for slab-column joints and shear reinforcement structure using same {SEAR REINFORCEMENT COMPONENT FOR A SLAB-COLUMN CONNECTION AND SHEAR REINFORCEMENT STRUCTURE USING THE SAME}

The present invention relates to a shear reinforcement for a slab-column joint and a shear reinforcing structure using the same, in particular, a girder or a beam protrudes to the outside, such as a flat slab or a flat plate. The present invention relates to a shear reinforcement for slab-column joints applied to a flat plate structure of a type embedded in a corresponding slab or plate, and a shear reinforcing structure using the same.

In general, in the flat plate structure, unlike the beam-column joint, the slab-column joint generates excessive stress concentration around the column. As a result, cracks are more likely to occur in the slab around the column, and in the worst case, there is a high possibility of lead to punching shear failure. Thus, the flat plate structure must be designed to be sufficiently resistant to such punching shear failure.

Therefore, in order to increase the shear strength of the slab-column joint in a flat plate structure, a stirrup method, a shear head installation method, a shear stud installation method, and the like have been widely used.

The use of the stirrup is widely applied as shown in Figure 1 (a), to increase the shear strength by winding the stirrup (stiff reinforcing bar) on the upper and lower reinforcing bars disposed across the slab-column junction. However, the use of this stub is economical because it is used to bend the conventional rebar, but it is very difficult to maintain a uniform coating thickness of the slab because it must surround the upper and lower reinforcement of the slab, and also the upper and lower parts of the slab Due to the need to bind a plurality of stirrups to the reinforcing bars one by one, there was a problem that the workability of the site is reduced, the constructionability.

The shear head mounting method is to install a shear head reinforcement composed of structural steel, such as H-shaped steel or I-shaped steel as shown in Figure 1 (b) to share the shear strength by the slab-column joint. However, such a shear head installation method is not only costly due to the use of the shaped steel material, but also has a large weight, which is inconvenient to handle, and there is a high possibility of disconnection between the slab and the column reinforcement by the installed shear head reinforcement.

The shear stud installation method, as shown in Figure 1 (c), by welding a plurality of studs (stud) on the top of the flat iron plate processed in the form of a strip (strip) to form a shear reinforcement and slab-column junction It is installed in the reinforcement of shear strength. However, this shear stud installation method is easy to install but very cumbersome for welding.

Accordingly, the present invention has been made to solve the problems described above, the object is to increase the resistance to punching shear failure that can occur in the slab-column junction due to excessive or repeated external force in the flat plate structure It is to provide a shear reinforcement for the slab-column joint and a shear reinforcing structure using the same.

Another object of the present invention is to compact the structure having a curved bending portion to facilitate the manufacturing and to reduce the cumbersome work for avoiding the interference with the adjacent reinforcing bars installed at the time of construction, convenient installation, compact It is to provide a shear reinforcement for the slab-column joint and a shear reinforcement structure using the same to increase the binding force with concrete in the slab-column joint vulnerable to repeated vertical vibration.

Another object of the present invention is to arrange the shear reinforcing member installed on one side of the slab-column joint in the flat plate structure in the forward direction such that its lower fixing part faces downward, and the other side of the shearing reinforcing body so that its lower mounting part faces upward. Shear reinforcement for slab-column joints and shear reinforcement using the same, which can be conveniently arranged in the reverse direction and increase the resistance to punching shear failure that can occur at the slab-column junction through such opposite arrangements. To provide.

In order to achieve the above object, the present invention includes an upper fixing portion consisting of a first circular arc portion for forming a channel for installation in the upper slab at intervals in the longitudinal direction;

A lower fixing part including a second circular arc part on one side and a third circular arc part on the other side, which are arranged in a form in which left and right are staggered from each other at a lower side in the longitudinal direction at a predetermined interval;

A column body connecting the first arc part of the upper fixing part and the second and third arc parts which are both sides of the lower fixing part to be perpendicular to each other in the longitudinal direction and the width direction but disposed parallel to each other at regular intervals;

The upper fixing part, the lower fixing part and the intermediate shear part are formed as a single body, and the second and third circular arc parts of the lower fixing part are semicircular, respectively, 3d (d: slab reinforcement or shear reinforcement outward from the center of the column body of the intermediate shear part). It provides a shear reinforcing body for the slab-column junction characterized in that more than protruding).

On the other hand, when the present invention is applied to a flat plate structure, in the shear reinforcing structure to integrate the slab and the pillar by installing the shear reinforcement on the slab in four directions around the column,

On one side in the width direction of the column using the shear reinforcement, the upper fixing part is installed and coupled to the upper slab reinforcement, the other side of the column in the width direction of the lower reinforcement of the other shear reinforcement upper and lower inverted The additionally provided and coupled to a pair of upper reinforcing bar is provided, and provides a shear reinforcement structure characterized in that the shear reinforcement and the other shear reinforcement are alternately installed in four directions around the column.

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The present invention is a region capable of controlling the shear cracking of the concrete while maximizing the shear stress of the intermediate shear portion of the shear reinforcement through the shape of the shear reinforcement perpendicular to the longitudinal direction and the width direction but arranged parallel to each other at a predetermined interval By maximizing the slab-column joint of the flat plate structure, excessive or repetitive external force is applied to increase the resistance to punching shear failure that may occur.

In addition, the present invention introduces a curved bending portion to the shear reinforcement, to facilitate the manufacturing and to easily avoid the interference with the adjacent reinforcing bars installed during the construction to facilitate the installation work, and also compact It is possible to maximize the binding force between shear reinforcement and concrete at the slab-column joint, which is susceptible to repeated vertical vibration.

Furthermore, in the flat plate structure, the shear reinforcing body installed at one side of the slab-column joint at the slab-column joint is disposed in the forward direction such that its lower fixing part faces downward, and the other side of the shear reinforcing body is mounted at the bottom thereof. It is possible to conveniently arrange in the reverse direction with the addition upwards, thereby increasing the resistance to punching shear failure that can occur at the slab-column junction.

In addition, the present invention by providing both sides of the lower fixing portion of the arc-shaped geometric shape and the protruding length of the circular arc portion of more than 3d (diameter of the reinforcement or shear reinforcement), by increasing the binding force between the circular arc portion and the concrete, the lower fixing The additional reinforcing bars need not be installed on both side arcs of the unit, ultimately lowering the construction cost.

Hereinafter, an embodiment of the slab-column joint shear reinforcement and a shear reinforcement structure using the same according to the present invention will be described with reference to FIGS. 2 to 7.

2 is a schematic perspective view showing a shear reinforcement for a slab-column junction according to the present invention, Figure 3 is a schematic plan view of a shear reinforcement for a slab-column junction according to the present invention. 4 is a schematic front view of a shear reinforcement for a slab-column junction according to the present invention, and FIG. 5 is a schematic side perspective view of a shear reinforcement for a slab-column junction according to the present invention.

The shear reinforcing body (1) for the slab-column joint according to an embodiment of the present invention, as shown in Figures 2 to 5, the upper fixing portion 10; It consists of a lower fixing part 20 and the intermediate shear part 30.

Here, the upper fixing portion 10 is disposed in each upper portion at regular intervals along the length and includes a first arc portion 11 for forming a channel (11a) for the corresponding upper reinforcement (not shown) of the slab In the form of

The lower fixing part 20 has a second circular arc portion 21 on one side and the third circular arc portion 22 on the other side which are arranged in a mutually staggered form on the left and right of each lower portion at a predetermined interval along the length. Is done.

The intermediate shear portion 30 is formed of the second arc portion 21 and the third arc portion 22 which are both sides of the first arc portion 11 of the upper fixing portion 10 and the lower fixing portion 20. Each corresponding portion is connected and two adjacent column bodies 30a on both sides are arranged in parallel with each other in the longitudinal direction and the width direction, respectively.

In addition, the upper fixing portion 10, the lower fixing portion 20 and the intermediate shear portion 30 is made of a single body, each of the second circular arc portion 21 and the third of the lower fixing portion 20 The circular arc portion 22 is formed to protrude more than 3d (d: diameter of reinforcing bars or shear reinforcing bodies) outward in the width direction from the column body 30a of the intermediate shear portion 30 (see FIG. 4). Here, the protruding length of "3d" is up to the tip end of the arc portion on the basis of the axis of the column body 3a.

In the shear reinforcement structure as described above, the first circular arc portion 11 of the upper fixing portion 10 and the second and third circular arc portions 21 and 22 of the lower fixing portion 20 are each in an arc shape. It is provided to facilitate bending production without undue deformation to the part.

In addition, since the two adjacent column body 30a on both sides of the intermediate shear part 30 are arranged in parallel in the longitudinal direction and the width direction, respectively, the interference of the upper and lower reinforcing bars that are arranged for slab production is easily avoided. Can facilitate installation in slab-column joints.

In addition, each of the second arc portion 21 and the third arc portion 22 of the lower fixing portion 20 is 3d (d: in the width direction outward from the column body 30a of the intermediate shear portion 30). Since it is provided to protrude more than the diameter of the reinforcing bar or shear reinforcing body, it is possible to increase the binding force between the lower fixing portion 20 and the concrete to be cast by the composite action of the arc shape and the protrusion length. The radius of curvature of each of the second arc portion 21 and the third arc portion 22 is determined to be about 2d (diameter of the reinforcement or shear reinforcement) to facilitate bending and increase the binding force with the concrete. It is desirable to. Each of the second and third circular arc portions 21 and 22 may be coupled with concrete in the circumference as far as possible than the conventional angled structure in terms of shape, thereby increasing shear strength. In addition, such a reinforcement structure greatly increases the binding force between the shear reinforcement 1 and the concrete, and thus it is not necessary to reinforce the auxiliary reinforcing bars on both sides of the lower fixing part 20.

On the other hand, the shear reinforcing structure according to another embodiment of the present invention is applied to a flat plate structure, as shown in Figure 6 and 7, a plurality of lower with a certain interval on the formwork around the column 40 In the shear reinforcement structure in which the reinforcing bars 41 and the upper reinforcing bars 42 are disposed and the upper and lower reinforcing bars are integrated with each other by the concrete pouring, the upper fixing part 10, the lower fixing part 20, and the intermediate shear part Shear reinforcement (1) consisting of (30); And another shear reinforcement body 50 having the same structure as the shear reinforcement body.

Here, the upper fixing part 10 is disposed in each upper portion at regular intervals along the length and includes a first arc portion 11 to form a channel (11a) for the corresponding upper reinforcement (not shown) of the slab It is made in the form of

The lower fixing part 20 has a second circular arc portion 21 on one side and the third circular arc portion 22 on the other side which are arranged in a mutually staggered form on the left and right of each lower portion at a predetermined interval along the length. Is done.

The intermediate shear portion 30 is formed by the second arc portion 21 and the third arc portion 22 which are both sides of the first arc portion 11 and the lower portion 20 of the upper fixing portion 10. Each corresponding portion is connected and two adjacent column bodies 30a on both sides are arranged in parallel with each other in the longitudinal direction and the width direction, respectively.

In addition, the upper fixing portion 10, the lower fixing portion 20 and the intermediate shear portion 30 is made of a single body, each of the second circular arc portion 21 and the third of the lower fixing portion 20 The circular arc portion 22 is formed to protrude more than 3d (d: diameter of reinforcing bars or shear reinforcing bodies) outward in the width direction from the column body 30a of the intermediate shear portion 30 (see FIG. 4). In addition, the shear reinforcement body 50 is disposed on one side in the width direction of the pillar 40 and the upper fixing portion 10 is disposed in the upper direction of the slab (see FIG. 7).

In the shear reinforcement structure as described above, the first circular arc portion 11 of the upper fixing portion 10 and the second and third circular arc portions 21 and 22 of the lower fixing portion 20 are each in an arc shape. It is provided to facilitate bending production without undue deformation to the part.

In addition, since the two adjacent column body 30a on both sides of the intermediate shear part 30 are arranged in parallel in the longitudinal direction and the width direction, respectively, the interference of the upper and lower reinforcing bars that are arranged for slab production is easily avoided. Can facilitate installation in slab-column joints.

In addition, each of the second arc portion 21 and the third arc portion 22 of the lower fixing portion 20 is 3d (d: in the width direction outward from the column body 30a of the intermediate shear portion 30). Since it is provided to protrude more than the diameter of the reinforcing bar or shear reinforcing body, it is possible to increase the binding force between the lower fixing portion 20 and the concrete to be cast by the composite action of the arc shape and the protrusion length. The radius of curvature of each of the second arc portion 21 and the third arc portion 22 is preferably determined to be about 2d (diameter of reinforcement or shear reinforcement) to increase the binding force between the bending work and the concrete. . Each of the second and third circular arc portions 21 and 22 may be coupled with concrete in the circumference as far as possible than the conventional angled structure in terms of shape, thereby increasing shear strength. In addition, since such a structure greatly increases the binding between the shear reinforcing body 1 and the concrete, it is not necessary to reinforce the auxiliary reinforcing bars on both sides of the lower fixing part 20.

The other shear reinforcement 50 has the same structure as the shear reinforcement 1, and is disposed on the other side in the width direction of the pillar 40 and fixed to the bottom so as to be opposite to the arrangement of the shear reinforcement 1. The part 20 is arranged above the slab. The expression "the other side in the width direction of the pillar 40" refers to the remaining direction of "one side in the width direction of the pillar" for convenience, and the other side in the width direction of the pillar 40 crosses the pillar 40. It may be in the left direction, or the right direction of the pillar. Such a complex arrangement allows a relatively simple structure to increase the resistance to vertical vibration and shear forces applied to the slab-column junction.

Meanwhile, components not described among the parts shown in FIG. 7 are conventionally used in the shear reinforcement structure, and reference numeral 43 denotes a lower spacer and 44 denotes an upper spacer.

Next, with reference to Figs. 6 and 7 a preferred installation process for configuring the shear reinforcement structure for the slab on the formwork around the column using the shear reinforcement for the slab-column junction according to the present invention configured as described above do.

First, after the formwork 60 is installed around the column 40, a plurality of lower reinforcing bars 41 around the column 40 via the lower spacer 43 installed on the formwork 60. ) Is arranged in a lattice form (see FIG. 6).

Then, the upper reinforcing bars 42 are first positioned on the upper spacers 44 respectively installed on the plurality of lower reinforcing bars 41 positioned at four peripheral regions of the pillar 40, and then the secondary rebars are secondarily located. On the pre-installed upper reinforcing bar in the direction intersecting with the upper reinforcing bar 42, the other upper reinforcing bar is arranged at a predetermined interval (see Fig. 6).

Then, a predetermined number of shear reinforcement bodies are inserted into the channel 11a formed by the first arc portion 11 forming the upper fixing portion 10 of the shear reinforcement body 1. (1) is attached to the upper bar (42). At this time, the upper fixing portion 10 of the shear reinforcement (1) is disposed in the upper direction of the slab (see Figure 7).

Then, the pre-installed upper reinforcing bar located in the remaining peripheral area of the pillar 40 so that the second and third arcuate portions 21 and 22 on both sides of the lower fixing part 20 of the other shear reinforcing body 50 are supported ( 42) The other shear reinforcement 50 is mounted on. At this time, the lower fixing part 20 of the other shear reinforcing body 50 is disposed in the upper direction of the slab (see Fig. 7).

Meanwhile, an upper reinforcing bar 42 may be further disposed on the shear reinforcing body 1 and the other shear reinforcing body 50 in a direction crossing the shear reinforcing body or in a longitudinal direction. In addition, in the case of the lower fixing part 20 of the other shear reinforcing body 50, both the second arc portion 21 and the third arc portion 22 of both sides of the lower fixing portion 20 is shown in FIG. It may be arranged to be further supported by the upper reinforcing bar (42a) additionally provided.

Then, the column stub (not shown) (or column strip reinforcing bar) is wrapped around the upper portion of the pillar 40 at a predetermined interval (or before the construction of the shear reinforcement structure, the pillar around the upper portion of the pillar 40 in advance). In the state of winding the stub), a slab is formed by putting a certain amount of concrete pouring on the shear reinforcement structure.

As described above, the slab formed as described above increases the space of the slab-column joint by strengthening the binding force between the shear reinforcing body and the concrete embedded in the slab, so that the beam does not protrude to the outside of the slab. Increase

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and simple substitution, modification and alteration within the technical spirit of the present invention will be apparent to those skilled in the art.

1 is a schematic plan view and a side cross-sectional view, respectively showing examples of shear reinforcing structures commonly applied in the prior art.

Figure 2 is a schematic perspective view showing a shear stiffener for the slab-column junction according to the present invention.

3 is a schematic plan view of a shear stiffener for a slab-column junction according to the present invention.

4 is a schematic front view of a shear stiffener for a slab-column junction according to the present invention.

5 is a schematic side perspective view of a shear stiffener for a slab-column junction according to the present invention.

FIG. 6 is a schematic perspective photograph showing an upper passer applied to the lower rebar of the slab-column junction according to the present invention and a portion of the upper reinforcement supported by the upper spacer; FIG.

Figure 7 is a schematic perspective photo showing a shear reinforcement structure using a shear reinforcement for slab-column junction according to the present invention.

<Description of the symbols for the main parts of the drawings>

1,50: shear reinforcing body 10: upper fixing part

11a: channel 11: first arc

20: lower fixing part 21: second arc part

22: third arc part 30: intermediate shear part

30a: column body 40: column

41: lower reinforcing bar 42: upper reinforcing bar

43: lower spacer 44: upper spacer

Claims (2)

An upper fixing part (10) consisting of a first arc portion (11) forming a channel (11a) for installation in the slab upper reinforcing bars (42) at regular intervals in the longitudinal direction; Lower fixing consisting of a second arc portion 21 on one side and a third arc portion 22 on the other side, which are arranged in a form in which left and right are staggered from each other at a lower side of the first arc portion 11 at a predetermined interval in the longitudinal direction. Part 20; The column body 30a connecting the first arc part 11 of the upper fixing part 10 and the second and third arc parts 21 and 22 of the lower fixing part 20 is formed in the longitudinal direction and the width direction. An intermediate shear part 30 that is vertical but is disposed parallel to each other at a predetermined interval; The upper fixing part 10, the lower fixing part 20, and the intermediate shear part 30 are formed in a single body, and the second and third circular arc parts 21 and 22 of the lower fixing part 20 each have a semicircular shape. Shear reinforcement for slab-column junction, characterized in that protruding more than 3d (d: diameter of the slab reinforcement or shear reinforcement) from the center of the column body (30a) of the intermediate shear portion 30 to the outside. In the shear reinforcing structure in which the shear reinforcing body is installed on the slab in four directions around the column 40 to integrate the slab and the pillar, On one side of the column 40 in the width direction, the upper fixing part 10 is installed and coupled to the upper slab of the slab using the shear reinforcement 1 of claim 1, and the width direction of the pillar 40 is combined. The other side is installed and coupled to a pair of upper reinforcing bars (42a), which is additionally provided with a lower fixing portion 20 of the other shear reinforcement (50) inverted upper and lower parts of the shear reinforcement (1) of claim 1, Shear reinforcement structure, characterized in that the shear reinforcement body (1) and the other shear reinforcement body (50) are alternately installed in the four directions around the column.

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