KR101858557B1 - Reinforced concrete columns with multiple x-type reinforcing bars - Google Patents

Abstract

The present invention relates to an arrangement structure of reinforcing bars of a reinforced concrete column which efficiently arranges a vertical reinforcing bar buried in concrete to have high structural performance by a minimal area of a column. The reinforced concrete column has a plurality of vertical main reinforcing bars arranged on corners of a column end surface or an outer circumferential surface thereof. Multiple X-shaped reinforcing bars are inserted into an internal space formed by arranging a stirrup enclosing an outer surface of the main reinforcing bar in a lateral direction of the column in a vertical direction of the column. The multiple X-shaped reinforcing bars include a first and a second bent inclination bar symmetrically arranged to cross each other. The first and the second inclination bar are inclined around a bending point. The bending point of the first and the second inclination bar is positioned on an outer side of an end surface formed by the stirrup. The multiple X-shaped reinforcing bars are installed in the main reinforcing bars.

Description

REINFORCED CONCRETE COLUMNS WITH MULTIPLE X-TYPE REINFORCING BARS [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure of reinforcing bars disposed on columns of a reinforced concrete structure and more specifically to a reinforced concrete structure capable of achieving a high structural performance with a minimum cross section of columns by effectively arranging vertical reinforcing bars, This paper deals with the layout structure of steel bars.

For example, in the case of a column having a square cross section, a vertical reinforcing bar is placed at each corner of the column, and a reinforcing bar for preventing buckling of the vertical reinforcing bar is provided Is laid.

At least four or more (six or more in the case of a circular cross section) of the vertical reinforcing bars are usually disposed at each corner, and vertical reinforcing bars are further disposed between the reinforcing bars if necessary.

Since the column in the reinforced concrete tank is connected to the beam, it is affected by the bending moment transmitted from the beam as well as the axial load in the vertical direction.

At this time, the vertical reinforcing steel shares the con- struction load with the concrete, and at the same time, it takes charge of the tensile load generated by the bending. Therefore, when the eccentricity of the column is largely affected by the earthquake, tensile failure may occur due to the yielding of the tensile side reinforcement.

FIG. 1 is a perspective view of a reinforced concrete pillar according to an embodiment of the present invention. FIG. 1 is a perspective view of a reinforced concrete pillar according to an embodiment of the present invention. At least one position fixing hoop reinforcing bars provided on at least one end of the longitudinal reinforcing bars to maintain a gap between the longitudinal reinforcing bars; And a helical fiber reinforcing bar which surrounds the longitudinal reinforcing bars in a spiral manner along the longitudinal direction of the longitudinal reinforcing bars and selectively surrounds the contacting portions with the longitudinal reinforcing bars while surrounding the reinforcing bars.

That is, the prior art of FIG. 1 improves the seismic performance by preventing the buckling of the vertical reinforcing bars by increasing the restraining force to the longitudinal reinforcing bars (vertical reinforcing bars) through the helical fiber reinforcing bars and preventing the brittle fracture by increasing the binding force to concrete will be.

FIG. 2 is another prior art for enhancing the vibration resistance, which is disclosed in Patent Registration No. 10-0638098 as an invention entitled " Method of Reinforcing a Reinforced Concrete Column with Reinforced Concrete Columns for Seismic Design. &Quot;

The reinforcing concrete column of FIG. 2 has a plurality of reinforcing bars arranged longitudinally at regular intervals to form a rectangular reinforced concrete column structure. An outer band reinforcing bar provided in a structure for horizontally surrounding the plurality of main reinforcing bars; A plurality of inner band reinforcing bars, both ends of which are in contact with the cast steel reinforcing bars and the outer steel reinforcing bars and are parallel to the outer steel reinforcing bars; And hooks formed in the middle are placed on the inside of the cast steel reinforcing bars and on the outer reinforcing bars so that both ends of the reinforcing bars extend over the reinforcing bars of the inner reinforcing bars, A plurality of V-shaped auxiliary strip reinforcing bars supported so as to be supported only by the V- And the inner bar reinforcing bar is connected to only two side cast iron bars adjacent to the edge casting bar bars.

In the conventional art shown in FIG. 2, the end of one side of the tubular structure which restrains the main reinforcing bars (vertical reinforcing bars) must be hooked at 90 degrees, and after the maximum load acting on the pillars, The reinforced concrete columns can not maintain proper ductility and solve the problem of brittle failure, thereby improving the seismic resistance of the reinforced concrete columns.

The improvement of the strength of the reinforced concrete column according to the prior art as shown in FIGS. 1 and 2 is to prevent brittle fracture of the concrete through prevention of buckling of the steel rope. For this purpose, reinforcement or shape of the reinforcing bars is changed. However, this method of reinforcement does not consider tensile failure and shear failure of vertical steel bars at all.

For example, it is necessary to bend and shear reinforcements within a certain range based on the joining portion of the beam. For this purpose, more vertical reinforcement is required as the most preferable method. However, In addition, there is a restriction that minimum spacing should be maintained between the two sides due to the passage, and the bending and shear force control by vertical reinforcement only requires excessive use of reinforcing bars.

KR 10-2003-0018728 A KR 10-1418689 B1

The present invention has been made to solve the above-mentioned problems of the prior arts, and it is an object of the present invention to provide a method and apparatus for efficiently disposing reinforcing bars in a vertical direction of a reinforced concrete column, thereby preventing brittle fracture of the concrete by preventing buckling of the cast iron bars, And to provide a reinforced concrete column capable of increasing seismic performance and minimizing the cross section of the column to increase the space for use of the building while minimizing the amount of steel material used and sufficiently controlling the shear failure.

According to the most preferred embodiment of the present invention for solving the above problems, a plurality of vertical directional steel rods are disposed at each corner or an outer periphery of a columnar section, and a band bar surrounding the outer surface of the steel rope is disposed in a lateral direction of the column Wherein the multiple X-shaped rebar body is inserted in a vertical direction of the column, and the multiple X-shaped rebar body is disposed so as to be symmetrical with respect to the first bending ramp and the second bending ramp, Wherein the first and second bending ramps are inclined about the bending point and the bending points of the first and second bending ramps are located outside the cross section formed by the band bars. A reinforced concrete column provided with a reinforcing body is provided.

In this case, when the column has a rectangular cross-section, a plurality of X-shaped reinforcing steel bodies provided in the inner space of the cast iron rods are disposed across any one of the opposite sides, or a pair of multiple X-shaped reinforcing steel bodies are disposed on opposite sides or opposite sides Can be placed at each corner. When the column has a circular cross-section, a plurality of multiple X-shaped reinforcing bars are disposed at equal intervals in the inner space of the cast iron root located at the outer periphery of the column section.

The number of bending points of the first and second bending warp roots can be a plurality, but when only one bending point is formed, the bending points are positioned at the center of the column length direction.

The ends of the first and second bending rams extend between the upper and lower bars of the bare steel assembly, and the anchor head or the 90-degree hook 150 may be further provided at the end.

The present invention provides a very high structural performance in comparison with a common column section in general, without increasing the size of the column section, by using the internal space surrounded by the cast iron rope to provide the multiple X- To maximize the space for building use.

More specifically, the present invention makes it possible to arrange reinforcing bars having a sufficient inclination angle with respect to a narrow cross-sectional space by constituting the multiple X-shaped reinforcing steel body with the first and second bent inclined rods inclined around the bending point It is possible to construct economical reinforced concrete columns by reducing the amount of rebar and increasing the resistance to tensile failure due to flexural load or to shear failure of column due to earthquake or wind load.

In addition, the present invention places the ends of the multiple X-shaped rebar body between the upper and lower bars of the bobbin assembly, thereby improving the resistance to the maximum bending moment generated at the column-to-beam joint, Which has a high quality column-to-beam connection structure.

1 is a perspective view of a transverse reinforcement structure for a reinforced concrete column according to the prior art.
FIG. 2 is a plan view of a reinforcing bar arrangement structure for improving seismic performance by another conventional technique. FIG.
3 is a perspective view of a columnar reinforced concrete assembly for reinforced concrete to which a multi-X reinforced reinforcing steel body according to a first embodiment of the present invention is applied.
4 is a cross-sectional view of the pillar reinforcing assembly of the first embodiment at each location.
5 is a perspective view showing each embodiment of the multiple X type reinforcing steel body of the first embodiment.
FIG. 6 is a perspective view of a state in which the first embodiment is applied to a continuous column.
7 is a perspective view of a columnar reinforced concrete assembly according to a modification of the first embodiment.
8 is a cross-sectional view at each portion of the modification example.
9 is a perspective view of a columnar reinforced concrete assembly for reinforced concrete to which a multi-X reinforced reinforcing steel body according to a second embodiment of the present invention is applied.
10 is a cross-sectional view of the pillar reinforcing assembly of the second embodiment at each location.
11 is a perspective view showing a multiple X type reinforcing steel body of the second embodiment.
12 is a perspective view of a columnar reinforced concrete assembly for reinforced concrete to which a multi-X reinforced reinforcing steel body according to a third embodiment of the present invention is applied.
13 is a cross-sectional view of the pillar reinforcing assembly of the third embodiment at each location.
FIG. 14 is a perspective view showing a multiple X-shaped reinforcing steel body of the third embodiment. FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, in order to obscure or obscure the technical idea of the present invention due to the detailed description of the known structure in describing the present invention, the description of the structure of the above known structure will be omitted.

The present invention provides a multi-X reinforced reinforcing steel body (100) in a reinforced concrete column in which a reinforcing steel rod (11) and a reinforcing bar (13) are laid, thereby improving the buckling preventing ability of the reinforcing rods (11) Thereby increasing the sharing capacity, increasing the yield strength against the flexural load and the shear load.

FIG. 3 is an overall view of a pillar reinforcing assembly 10 assembled by pillar reinforcing according to an embodiment of the present invention. FIG. 4 is a cross-sectional view of the pillar reinforcing assembly 10 at each position And FIG. 5 is a view showing the shape of the multiple X-shaped reinforcing steel body 100 positioned inside the cast steel rope 11 of the column steel assembly 10. FIG. 6 shows an example in which the present invention is applied to a continuous column Respectively.

The reinforced concrete pillar of the present invention is characterized in that the reinforcing concrete column of the present invention comprises a vertical reinforcing steel rod 11 in the interior of concrete, a reinforcing steel bar 13 surrounding the outer surface of the reinforcing steel bar 11 in the lateral direction of the pillar, And a plurality of X-shaped reinforcing steel bodies 100 disposed in an inner space formed by the column reinforcing steel bodies 100. As shown in FIG.

The reinforced concrete column may have a rectangular cross section or a circular cross section. Accordingly, in the case of a square cross-section, a plurality of bars of the cast steel reinforcing bars 11 are disposed at each corner of the column cross section, and the steel reinforcing bars 13 surrounding the cast steel reinforcing bars 11 form a quadrangle. The reinforcing steel body 100 can be selectively disposed at sides or corners opposite to each other depending on a direction to be reinforced. On the other hand, in the case of a column having a circular section, at least six cast iron rods 11 are arranged with a constant spacing , And the multiple X reinforced reinforcing bars 100 inserted into the circular band reinforcing bars 13 surrounding the round reinforcing reinforcing bars 100 can have a non-directionality balanced equally spaced on the circumference. As described above, the X-type reinforcing steel bar 100 can be applied to any type of bar regardless of the cross-sectional shape of the column.

3 to 6 illustrate a case where a reinforced concrete column has a rectangular cross-section as a first embodiment of the present invention, in which a plurality of cast iron rods 11 are disposed at each corner of a column cross-section. At this time, a reinforcing water rectilinear reinforcement 12 may be further provided between adjacent reinforcing bars 11.

In this embodiment, an inner space having a rectangular cross-sectional shape is formed by the cast iron rods 11 disposed at the respective corners of the rectangular cross-sectional columns. The inner X- 100 are disposed.

The multi-X reinforced reinforcing steel body 100 includes a first bending warp 110 and a second bending warp 120 having the same shape. At this time, the first and second bending warp roots 110 and 120 are arranged to be symmetrical with respect to each other, and are each inclined about the bending point 131 as shown in FIG. Therefore, each bending point 131 of the first and second bending warp roots 110 and 120 is positioned outside the cross-section formed by the belt bar 13.

5 (a), each of the first and second bending warp roots 110 and 120 may be formed of one reinforcing bar, and as shown in FIG. 5 (b) Or may be composed of a plurality of reinforcing bars. Preferably, the multiple X-shaped rebar members 100 are arranged so as to be symmetrical with respect to each cross section so that the stress generated in the columns can be evenly distributed to the front end face.

As described above, the first and second bending warp roots 110 and 120 constituting the multi-X reinforced reinforcing steel body 100 are inclined at both sides with respect to the bending point 131, Even though it is a column section, the reinforcing bars arranged in the inner space have a sufficient inclination angle to effectively resist the shearing force due to warping and lateral load, thereby reducing the amount of reinforcing steel used, . The number of the bending points 131 may be two or more depending on the size and the length of the cross section of the column.

The upper and lower ends of the multiple X-shaped reinforcing steel body 100 in which the first and second bending warp roots 110 and 120 are assembled may have a number of bending points 131, (110, 120). This shape of the end portion prevents the stress acting on the multi-X reinforcing steel body 100 from being concentrated, thereby making it possible to suppress the occurrence of cracks in the beam-column joint portion.

In order to maximize the function of the multi-X reinforced reinforcing steel body 100, it is preferable that the first and second bending warp roots 110 and 120 have a sufficient inclination angle while crossing the cross section of the column as much as possible. For example, when the bending point 131 is formed by one bending point 131, it is preferable that the bending point 131 is positioned at the center of the column length direction. At this time, the bending point 131 is divided by two adjacent cast iron rods 11 Each of the ends of the first and second bending warp roots 110 and 120 located at the upper and lower sides is formed so as to extend across the pillar section to such an extent as to come into contact with an imaginary plane on the opposite side formed by another two cast iron rods 11 1,2 folding oblique roots (110,120) are installed.

It is preferable that the ends of the first and second bending warp roots 110 and 120 extend between the upper reinforcing bar 21 and the lower reinforcing bar 22 of the bare steel reinforcing assembly 20 to be fixed. This position of the end increases the coupling force between the column and the boss and improves the ability to resist the maximum bending moment generated at that position.

In addition, fixing means may be further provided at the ends of the first and second bending warp roots 110 and 120. The fixing means may be an anchor head 140 or a 90 degree hook 150 that is bent at an end thereof in a horizontal direction.

The anchor head 140 may be formed in various shapes that are not easily extracted from the concrete. In one embodiment, the anchor plate 141 may be formed with a threaded portion at the ends of the first and second bending warp roots 110 and 120, And then the nut 133 is fastened to the threaded portion to be anchored by the plate-shaped end face of the anchor plate 141. At this time, a spiral wire 143 is wound on the back side (inner sides of the first and second bending warp roots 110 and 120) of the anchor plate 141 so that the stress generated at the ends of the first and second bending warp roots 110 and 120 is wide So that it can be dispersed.

When the first and second bending warp threads 110 and 120 are formed of a plurality of reinforcing bars as shown in FIG. 5 (b), the anchor head 140 may be provided separately for each reinforcing bar, The anchor head 140 has a structure in which the end portions of the reinforcing bars are fixed to one anchor plate 141 so that the reinforcing bars act integrally with various loads and an anchoring area formed by the anchor plate 141 can be increased. .

The configuration of the anchor head 140 and the 90-degree hook at the ends of the first and second bending warp roots 110 and 120 is the same in the remaining embodiments described later.

In the embodiment shown in FIGS. 3 to 6, one multi-X reinforced reinforcing steel body 100 is installed on a square cross-section column, which is suitable for a column having a rectangular cross-section.

In the modification shown in Figs. 7 and 8, a pair of multiple X-shaped reinforcing steel bodies 100 are arranged at mutually opposite sides of a column section so as to be orthogonal to each other. This arrangement can be advantageously applied to columns of square cross section. However, this does not mean that one multi-X reinforcing steel body 100 is applied to a rectangular cross section and a pair of multiple X-type reinforcing steel bodies 100 should be applied to a square cross-section.

However, when a pair of multiple X-shaped reinforcing steel bodies 100 are installed so as to be orthogonal to each other, the first and second bent oblique roots 110 and 120 The inclination angles must be different from each other.

9 to 11 show a pillar reinforcing steel frame assembly 10 having a multi-X reinforcing steel reinforcing framework 100 arrangement structure of a second embodiment applicable to a square cross-section pillar and its multiple X reinforcing reinforcing steel framework 100, It is

In the above-described first embodiment, the multi-X reinforced reinforcing steel body 100 is installed around each side of the square cross section of the column, whereas the multiple X reinforcing steel body 100 in the second embodiment is a column Of the square cross-section.

More specifically, as shown in Fig. 9, the multiple X-shaped rebar structures 100 provided in the internal space of the cast iron 11 disposed at each corner of the rectangular cross-section are disposed at the corners opposite to each other.

The second embodiment of this arrangement can be advantageously applied especially when the cross-section of the square pillar is narrow. The second embodiment also has a structure in which two multi-X reinforcing steel reinforcing members 100 intersect with each other. As in the modification of the first embodiment, 2 bending warp threads 110 and 120 are different from each other. This is the same when two or more multiple X-shaped reinforcing steel bodies 100 of the third embodiment described later are disposed so as to intersect with each other.

FIGS. 12 to 14 show a third embodiment of the present invention in which a columnar reinforcing bar assembly 10 applied to a column having a circular cross section and a multiple X reinforcing barrel 100 constituting the column reinforcing bar assembly 10 are shown.

In the case where the column has a circular cross section, at least six vertical steel rods 11 are arranged on the outer circumference of the circular cross section, and the outer surface of the cast steel reinforcing bars 13 is surrounded by a circular or spiral band steel bar 13 And a plurality of multiple X-shaped reinforcing steel bodies 100 are installed in the inner space.

At this time, it is preferable to arrange the number of the multiple X-shaped reinforcing steel bodies 100 uniformly with respect to the end face of the column so that the eccentricity of stress does not occur. For example, when there are six cast iron rods 11, three multi-X reinforcing steel rods 100 are positioned between adjacent steel rods 11 so that the respective multiple X reinforcing rods 100 are spaced at the same interval .

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it will be possible to carry out various modifications thereof. It is therefore intended that such modifications are within the scope of the invention as set forth in the claims.

10; A pillar reinforcing assembly 11; Cast iron rope
12; Reinforced water rectilinear 13; Band bar
20; A bobbin assembly 21; Upper reinforcement
22; Lower reinforcement 100; Multiple X-shaped rebar
110; A first bending ramp 120; 2nd bending slope
131; Bending point 133; nut
140; Anchor head 141; Anchor plate
142; Nut 143; Wire
150; 90 degree hook

Claims (6)

For a reinforced concrete column,
A plurality of vertical reinforcing steel bars 11 are arranged at each corner of the column section and a reinforcing bar 13 surrounding the outer surface of the cast steel reinforcing bars 11 is disposed in the lateral direction of the column, (100) is inserted in the vertical direction of the column,
The multiple X-shaped rebar structure 100 has a first bending warp 110 and a second bending warp 120, which are inclined about a bending point 131 located at the center of the column length direction, And is configured to be crossed,
One pair of the multiple X-shaped reinforcing steel bodies 100 is arranged in a direction perpendicular to the mutually opposing sides of the internal space, and the respective bending points 131 of the first and second bending warp roots 110 and 120 are connected to each other , Wherein the upper and lower ends of the first and second bending warp roots (110, 120) are configured to have a shape in which a gap is formed between the upper and lower ends of the reinforcing bars Pillar. delete delete delete The method according to claim 1,
The end portions of the first and second bending warp roots 110 and 120 extend between the upper and lower reinforcing bars 21 and 22 of the bobbin assembly 20 and the anchor head 140 is installed at the end portion. A reinforced concrete column with multiple X - shaped reinforcing bars. The method according to claim 1,
The end portions of the first and second bending ramps 110 and 120 extend between the upper and lower reinforcing bars 21 and 22 of the bare steel assembly 20 and the end portion is provided with a horizontally bent 90- Wherein the reinforcing member is provided with a plurality of reinforcing bars.

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