KR102726033B1 - Wide girder structure to improve stability and increase construction conveience and slab construction method using the same - Google Patents

Abstract

A wide girder according to one embodiment of the present invention comprises: a body; a pair of upper recesses formed on upper surfaces of both ends of the body; a lower recess formed in the center of a lower surface of the body; and a plurality of hook reinforcing bars installed on the upper surface of the body at regular intervals in a longitudinal direction of the body; wherein each of the pair of upper recesses comprises: a pair of protrusions formed at an entrance of the upper recess to protrude toward each other from an inner surface of the upper recess; and a plurality of protrusions formed at regular intervals on an inner surface of the upper recess.
By using a wide girder according to one embodiment of the present invention having the structure as described above, the thickness and length of the slab can be reduced, thereby reducing the sagging load and sagging moment of the slab, thereby ensuring structural stability, and there is an advantage in that the amount of concrete used to manufacture the wide girder and the slab can be minimized, and since the slab is constructed using the wide girder, the manufacturing cost can be reduced, and there is an advantage in that rapid construction can be performed with excellent construction quality during assembly.

Description

Wide girder structure to improve stability and increase construction convenience and slab construction method using the same

The present invention relates to a girder structure, and more specifically, to a wide girder structure capable of improving stability and increasing construction convenience, and a slab construction method using the same.

Generally, there are two methods of constructing slabs: one is to install a formwork on-site and pour concrete to construct, and the other is to produce the slab by pouring concrete into the formwork at a factory, then transporting it to the site and installing it.

Precast concrete slab construction method uses high-strength concrete and introduces prestress to suppress sagging or cracking of the slab, so it is widely used in factories, large stores, warehouses, stadiums, parking lots, etc.

However, PC slabs require long-span structures to secure internal space, and PC slabs are very large and heavy to support long spans and high loads.

Therefore, a method that can reduce the thickness and length of the slab is required.

1. Republic of Korea Patent No. 10-2489817 “PC Structure Beam and PC Structure Equipped with Same” 2. Republic of Korea Patent No. 10-2489814 “PC Structure Beam and PC Structure Equipped with Same” 3. Republic of Korea Patent No. 10-2204561 “Ultra-speed PC structure construction method using two-way low PC girder” 4. Republic of Korea Publication Patent No. 10-2015-0031777 “Construction method of a jointless bridge using a wide PSC girder with integrated shear connector” 5. Republic of Korea Patent No. 10-2294567 "Prestressed wide-width convex T-girder with adjustable tension and information construction system for temporary structures capable of predicting and adjusting external forces using the same and construction method thereof" 6. Republic of Korea Publication Patent No. 10-2015-0019274 “Wide PC Composite Girder”

The purpose of the present invention is to provide a wide girder capable of securing structural stability by reducing the thickness and length of the slab, thereby reducing the sagging load and sagging moment of the slab, and minimizing the amount of material.

In addition, the present invention aims to provide a slab construction method using wide girders, which can reduce manufacturing costs by constructing a slab using the wide girders as described above, and can rapidly construct with excellent construction quality during assembly.

In order to achieve the above object of the present invention, a wide girder according to one embodiment of the present invention comprises: a body; a pair of upper recesses formed on upper surfaces of both ends of the body; a lower recess formed in the center of a lower surface of the body; and a plurality of hook reinforcing bars installed on the upper surface of the body at a predetermined interval in the longitudinal direction of the body; wherein each of the pair of upper recesses may include a pair of protrusions formed to protrude toward each other from an inner surface of the upper recess at an entrance of the upper recess; and a plurality of protrusions formed at a predetermined interval on an inner surface of the upper recess.

According to a wide girder according to one embodiment of the present invention, both sides of the body may include inclined surfaces inclined with respect to the lower surface.

According to a wide girder according to one embodiment of the present invention, a plurality of protrusions of the upper recess may be formed to be arranged at regular intervals in the longitudinal direction and the width direction of the body.

In order to achieve the above-described object of the present invention, a slab construction method using a wide girder according to one embodiment of the present invention comprises the steps of: preparing a first wide girder and a second wide girder including a body, a pair of upper recesses formed on the upper surface of both ends of the body, a lower recess formed in the center of the lower surface of the body, and a plurality of hook reinforcing bars installed at a predetermined interval in the longitudinal direction of the body on the upper surface of the body; installing a plurality of columns including a support plate formed on an upper end and a pair of connecting protrusions formed on both ends of the upper surface of the support plate at a predetermined interval from each other; arranging the first wide girder and the second wide girder on the support plates of the plurality of columns so as to face each other in the longitudinal direction with the pair of connecting protrusions interposed therebetween, thereby forming a connecting space formed by connecting the upper recess of the first wide girder, the upper recess of the second wide girder, and the space between the pair of connecting protrusions; A method of constructing a reinforced concrete structure, the method comprising: a step of installing a plurality of slabs along the longitudinal direction of a pair of wide girders, wherein both ends of a slab are placed on a pair of wide girders that are installed in a widthwise direction; and a step of pouring concrete into the connecting space, the upper surfaces of the first and second wide girders, and the upper surfaces of the plurality of slabs and curing the concrete; wherein each of the pair of upper recesses of the first wide girder and the second wide girder may include a pair of protrusions formed to protrude toward each other from the inner surface of the upper recess at the entrance of the upper recess; and a plurality of protrusions formed at a set interval on the inner surface of the upper recess.

According to a slab construction method using a wide girder according to one embodiment of the present invention, the distance between the outer surfaces of a pair of connecting jaws of the column may be equal to the width of the first wide girder and the width of the second wide girder.

By using a wide girder according to one embodiment of the present invention having the structure as described above, the thickness and length of the slab can be reduced, thereby reducing the sagging load and sagging moment of the slab, thereby ensuring structural stability. In addition, the amount of concrete used to manufacture the wide girder and the slab can be minimized.

According to the slab construction method using a wide girder according to one embodiment of the present invention as described above, the slab is constructed using a wide girder, so the manufacturing cost can be reduced, and rapid construction can be performed with excellent construction quality during assembly.

FIG. 1 is a perspective view showing a wide girder according to one embodiment of the present invention.
Figure 2 is a bottom perspective view showing a wide girder according to one embodiment of the present invention.
Figure 3 is a front view showing a wide girder according to one embodiment of the present invention.
FIG. 4 is a partial perspective view showing an upper recess of a wide girder according to one embodiment of the present invention.
Figure 5 is an enlarged perspective view of part A of Figure 4.
FIG. 6 is a partial perspective view showing a state in which reinforcing bars are installed between a plurality of projections of an upper recess of a wide girder according to one embodiment of the present invention.
FIG. 7 is a perspective view showing a state in which two wide girders are installed on a support plate (110) of a column according to one embodiment of the present invention.
FIGS. 8 to 11 are drawings for explaining a slab construction method using a wide girder according to one embodiment of the present invention.

The embodiments described below are provided as examples to help understand the present invention, and it should be understood that the present invention can be implemented by modifying variously different from the embodiments described herein. However, in describing the present invention below, if it is determined that a specific description of a related known function or component may unnecessarily obscure the gist of the present invention, the detailed description and specific illustration thereof will be omitted. In addition, the attached drawings are not drawn to scale to help understand the present invention, and the dimensions of some components may be exaggerated.

Terms used in the embodiments of the present invention may be interpreted as having meanings commonly known to a person of ordinary skill in the art, unless otherwise defined.

In addition, the terms 'leading end', 'rear end', 'upper end', 'lower end', 'top end', 'bottom end', etc. used in the present invention are defined based on the drawings, and the shape and position of each component are not limited by these terms.

Hereinafter, with reference to the attached drawings, a wide girder (1) and a slab construction method using the wide girder (1) according to one embodiment of the present invention will be described in detail.

Fig. 1 is a perspective view showing a wide girder (1) according to one embodiment of the present invention. Fig. 2 is a bottom perspective view showing a wide girder (1) according to one embodiment of the present invention. Fig. 3 is a front view showing a wide girder (1) according to one embodiment of the present invention. Fig. 4 is a partial perspective view showing an upper recess (20) of a wide girder (1) according to one embodiment of the present invention. Fig. 5 is a partial enlarged perspective view showing an enlarged portion A of Fig. 4.

Referring to FIGS. 1 to 4, a wide girder (1) according to one embodiment of the present invention may include a body (10) and a plurality of hook reinforcing bars (60).

The body (10) can be formed in a rectangular hexahedron shape with a length (L) that is approximately long. The cross section of the body (10) is formed to have a wide width (W) and a thin thickness (T). That is, the width (W) of the body (10) is larger than the thickness (T) of the body (10). For example, the width of the body (10) can be at least twice the thickness of the body (10).

Increasing the width of the body (10) can reduce the net span of the slab, thereby reducing the structural burden on the slab.

The body (10) may include a pair of inclined surfaces (131). The pair of inclined surfaces (131) may be formed on both sides (13) of the body (10), that is, the left side and the right side. The pair of inclined surfaces (131) may be formed to be inclined with respect to the lower surface (12) of the body (10). The pair of inclined surfaces (131) may be formed to have the same inclination.

The two sides (13) of the body (10) may include a vertical surface (132) and an inclined surface (131). The vertical surface (132) may be formed perpendicular to the lower surface (12) of the body (10). The height of the vertical surface (132) may be formed smaller than the height of the inclined surface (131).

By forming an inclined surface (131) on both sides (13) of the body (10), the amount of material required to manufacture the wide girder (1), i.e. the amount of concrete, can be reduced, the structural stability is excellent, and there is also a visually attractive effect.

The body (10) includes a pair of upper recesses (20). The pair of upper recesses (20) are formed on the upper surfaces of both ends of the body (10). That is, the pair of upper recesses (20) can be formed at the front and rear ends of the body (10). Since the pair of upper recesses (20) are formed identically, the following description will be based on one upper recess (20).

The upper recess (20) is formed at a certain depth on the upper surface (11) of the body (10). The upper recess (20) is formed so as not to penetrate the lower surface (12) of the body (10). One end of the upper recess (20) is open. Therefore, the upper recess (20) can be formed at a certain depth in the longitudinal direction at one end of the body (10). For example, the upper recess (20) formed at the front end of the body (10) is connected to the front surface (14) of the body (10). That is, the entrance of the upper recess (20) is formed at the front surface (14) of the body (10).

The upper recess (20) may include a pair of protrusions (30). The pair of protrusions (30) may be formed at the entrance of the upper recess (20). The pair of protrusions (30) may be formed to protrude toward each other from the inner surface of the upper recess (20). That is, the pair of protrusions (30) may be formed to protrude from the left inner surface and the right inner surface of the upper recess (20). The gap (W1) between the pair of protrusions (30) is narrower than the gap (W2) between the two sides of the upper recess (20).

By forming a pair of protrusions (30) in the upper recess (20), the bonding strength and integrity of the concrete and the wide girder (1) can be improved when pouring concrete into the upper recess (20) to connect two wide girders (1).

The upper recess (20) may include a plurality of protrusions (40). The plurality of protrusions (40) may be formed at regular intervals on the inner surface of the upper recess (20). The plurality of protrusions (40) may be formed on the inner surface of the upper recess (20). For example, the plurality of protrusions (40) may be formed on the bottom (21), the left side, the right side, and the rear surface of the upper recess (20). In addition, the plurality of protrusions (40) may be formed on the surfaces of a pair of protrusions (30).

By forming a plurality of protrusions (40) in the upper recess (20), when pouring concrete into the upper recess (20) to connect two wide girders (1), the bonding strength and integrity of the concrete and the wide girders (1) can be improved.

As illustrated in FIG. 5, a plurality of protrusions (40) may be formed to be arranged at regular intervals in the longitudinal and width directions of the body (10). For example, a plurality of protrusions (40) may be formed at a plurality of intersections where a plurality of virtual first straight lines (VL1) parallel to the longitudinal direction of the body (10) and a plurality of virtual second straight lines (VL2) parallel to the width direction of the body (10) intersect. Accordingly, a plurality of protrusions (40) may be positioned at the corners of an imaginary square.

The plurality of protrusions (40) can be spaced apart at a distance such that a reinforcing bar (70) can be inserted between two adjacent protrusions (40).

FIG. 6 is a partial perspective view showing a state in which reinforcing bars (70) are installed between a plurality of protrusions (40) of an upper recess (20) of a wide girder (1) according to one embodiment of the present invention.

As shown in FIGS. 5 and 6, a plurality of protrusions (40) are arranged at equal intervals in the transverse and longitudinal directions. Accordingly, a space like a straight groove in the transverse and longitudinal directions can be formed between the plurality of protrusions (40).

As shown in Fig. 6, reinforcing bars (70) for connecting two wide girders (1) can be inserted into the space between the plurality of projections (40). Then, the reinforcing bars (70) can be easily positioned in the correct position by the plurality of projections (40). In addition, when the reinforcing bars (70) are positioned in the space between the plurality of projections (40), the reinforcing bars (70) can be prevented from moving when pouring concrete into the upper recess (20).

The plurality of protrusions (40) may be formed to have a square cross-section. However, the cross-sectional shape of the plurality of protrusions (40) is not limited thereto. For example, the plurality of protrusions (40) may be formed to have a circular cross-section.

The body (10) may include a lower recess (50). The lower recess (50) may be formed longitudinally in the center of the lower surface (12) of the body (10). The lower recess (50) may be formed between a pair of upper recesses (20). The lower recess (50) may be formed as large as possible without interfering with the pair of upper recesses (20) and the plurality of reinforcing bars (70).

The lower recess (50) can be formed as a groove having a roughly rectangular cross-section on the lower surface (12) of the body (10). The lower recess (50) is formed so as not to penetrate the upper surface (11) of the body (10).

By forming a lower recess (50) in the body (10), the amount of concrete forming the wide girder (1) can be reduced.

The lower recess (50) may include a middle wall (51). The middle wall (51) may be installed in the center in the longitudinal direction of the lower recess (50). When the middle wall (51) is installed in the lower recess (50), distortion of the wide girder (1) can be prevented, thereby increasing structural stability.

The body (10) may include a plurality of hook reinforcing bars (60). The plurality of hook reinforcing bars (60) may be installed at regular intervals along the length of the body (10) on the upper surface of the body (10). The plurality of hook reinforcing bars (60) may be installed at regular intervals along both sides of the body (10). For example, the plurality of hook reinforcing bars (60) may be installed in two rows along the length of the body (10) along the left and right sides of the body (10).

A plurality of hook reinforcing bars (60) can be installed on both sides of a pair of upper recesses (20) formed on the upper surface of the body (10) so as not to interfere with the pair of upper recesses (20).

The lower portions of the plurality of hook reinforcing bars (60) are embedded in the interior of the body (10), and the upper portions (61) of the plurality of hook reinforcing bars (60) are formed in a hook shape. The lower portions of the plurality of hook reinforcing bars (60) can be installed so as not to interfere with the lower recess (50) formed on the lower surface of the body (10).

A plurality of hook reinforcing bars (60) can improve the bonding with concrete that will be poured on the upper surface of the body (10) at the site later and reinforce the shear force of the body (10).

A body (10) having the above structure can be manufactured using a precast concrete method.

By using a wide girder (1) according to one embodiment of the present invention having a structure as described above, the thickness and length of the slab can be reduced, so that the sagging load and sagging moment of the slab can be reduced, thereby ensuring structural stability. In addition, the amount of concrete used to manufacture the wide girder (1) and the slab can be minimized.

According to one embodiment of the present invention having the structure as described above, two wide girders (1) can be joined using a column support plate (110) and a pair of connecting projections (120). The joining structure of two wide girders (1) is described with reference to Fig. 7.

FIG. 7 is a perspective view showing a state in which two wide girders (1) according to one embodiment of the present invention are installed on a support plate (110) of a column (100).

Referring to FIG. 7, the pillar (100) may include a support plate (110) and a pair of connecting jaws (120).

The support plate (110) can be installed on the top of the pillar (100). The support plate (110) can be formed in a roughly rectangular flat shape. The support plate (110) is formed so as to support one end of the two bodies (10).

A pair of connecting jaws (120) may be formed on the upper surface of the support plate (110). The pair of connecting jaws (120) may be installed at a predetermined distance apart from each other on the upper surface of the support plate (110). For example, the distance between the outer surfaces of the pair of connecting jaws (120) may be installed to be the same as the width of the wide girder (1). The pair of connecting jaws (120) may be installed perpendicularly to the upper surface of the support plate (110).

A pair of connecting jaws (120) may be positioned between two wide girders (1) supported by the supporting plates (110). For example, when the two wide girders (1) supported by the supporting plates (110) in FIG. 7 are respectively referred to as the first wide girder (1) and the second wide girder (1), a pair of connecting jaws (120) may be positioned between one end of the first wide girder (1) and one end of the second wide girder (1) facing each other. That is, the first wide girder (1) and the second wide girder (1) are spaced apart by the width of the pair of connecting jaws (120).

The space between the upper recess (20) of the first wide girder (1), the upper recess (20) of the second wide girder (1), and a pair of connecting ribs (120) forms a connecting space (S).

By arranging reinforcing bars (70) in the connecting space (S) and pouring concrete, the first wide girder (1) and the second wide girder (1) that are adjacent to each other can be connected. That is, by arranging a plurality of reinforcing bars (70) on the bottom surface of the upper recess (20) of the first wide girder (1) forming the connecting space (S) and the bottom surface of the upper recess (20) of the second wide girder (1), and pouring concrete in the connecting space (S), the two wide girders (1) can be connected. At this time, the plurality of reinforcing bars (S) are supported by a plurality of protrusions (40) formed on the bottom surfaces of the two wide girders (1), so that the positions can be maintained when pouring the concrete.

When concrete is poured and cured in the connecting space (S) at the site to connect two wide girders (1), a pair of protrusions (30) of the upper recesses (20) of the two wide girders (1) are inserted into the interior of the concrete, so that the two connected wide girders (1) can be prevented or suppressed as much as possible from being separated longitudinally from the concrete.

The support plate (110) and the pair of connecting jaws (120) may be formed integrally with the column (100). For example, the column (100), the support plate (110), and the pair of connecting jaws (120) may be manufactured integrally using a precast concrete method.

In addition, although not shown, a plurality of reinforcing bars may protrude from the upper surface of the support plate (110). The lower portions of the plurality of reinforcing bars may be embedded in the column (100). When a plurality of reinforcing bars protrude from the upper surface of the support plate (110), the connection between the two wide girders (1) and the column (100) can be further strengthened.

Hereinafter, with reference to FIGS. 8 to 11, a slab construction method using a wide girder (1) according to one embodiment of the present invention will be described.

Figures 8 to 11 are drawings for explaining a slab construction method using a wide girder (1) according to one embodiment of the present invention.

First, a plurality of wide girders (1) are prepared. The plurality of wide girders (1) are formed in the same shape. Specifically, the wide girder (1) may include a body (10), a pair of upper recesses (20) formed on the upper surface of both ends of the body (10), a lower recess (50) formed in the center of the lower surface of the body (10), and a plurality of hook reinforcing bars (60) installed at regular intervals in the longitudinal direction of the body (10) on the upper surface of the body (10). Since the structure of these plurality of wide girders (1) has been described above, a detailed description thereof will be omitted.

Multiple wide girders (1) are manufactured in a separate precast concrete factory and transported to the site.

Next, as shown in Fig. 8, a plurality of pillars (100) are installed on site. The plurality of pillars (100) are installed at a set interval from each other.

A plurality of columns (100) can be manufactured in a separate precast concrete factory and transported to the site. A plurality of columns (100) are formed in the same shape. Specifically, the column (100) can include a support plate (110) formed on the top and a pair of connecting protrusions (120) formed on both sides of the upper surface of the support plate (110). Since the structure of these plurality of columns (100) has been described above, a detailed description thereof will be omitted.

Next, a wide girder (1) is installed on the upper portion of two adjacent columns (100) among a plurality of columns (100) installed at regular intervals, that is, on the support plates (110) of the two adjacent columns (100). Specifically, one end of the wide girder (1) is installed so that it contacts one end of a pair of connecting jaws (120) of the support plates (110) of the columns (100), and the other end of the wide girder (1) is installed so that it contacts one end of a pair of connecting jaws (120) of the support plates (110) of the adjacent columns (100).

A pair of connecting jaws (120) are faced and a wide girder (1) that is different in the longitudinal direction is installed on the support plate (110). For example, as illustrated in FIG. 9, two wide girders (1, 1') are installed in a straight line and continuously on the support plates (110) of three columns (100). At this time, since one end of the wide girder (1, 1') can be installed so as to contact one end of the pair of connecting jaws (120), the installation of the wide girder (1, 1') can be easily accomplished. That is, since the wide girder (1, 1) can be installed based on the pair of connecting jaws (120) of the column (100), the wide girder (1) can be easily installed.

When two wide girders, i.e., a first wide girder (1) and a second wide girder (1'), are placed facing each other in the longitudinal direction with a pair of connecting jaws (120) interposed on a support plate (110) of a column (100), the space between the upper recess (20) of the first wide girder (1), the upper recess (20) of the second wide girder (1'), and the pair of connecting jaws (120) is connected to form a connecting space (S).

Next, a plurality of slabs (200) are installed on a plurality of wide girders (1, 1'). Specifically, as shown in Fig. 10, both ends of the slab (200) are installed on a pair of wide girders (1) that are installed in parallel in the width direction. A plurality of slabs (200) are installed continuously along the length direction of a pair of wide girders (1). The plurality of slabs (200) can be installed so as to be in contact with each other.

Next, as shown in Fig. 11, concrete (300) is poured and cured on the upper surfaces of the first and second wide girders (1, 1') and the upper surfaces of multiple slabs (200) at the site to connect them.

Specifically, concrete (300) is poured into the connecting space (S) formed by the upper recesses (20) of the first and second wide girders (1), the upper surfaces of the first and second wide girders (1, 1'), and the upper surfaces of the plurality of slabs (200). The concrete (300) can be poured at a height at which the plurality of hook reinforcing bars (60) of the first and second wide girders (1) are not exposed.

Since a plurality of reinforcing bars (70) are arranged on the floor of a connecting space (S) formed by an upper recess (20) of an adjacent first wide girder (1), an upper recess (20) of a second wide girder (1'), and a pair of connecting ribs (120) of a column (100), when concrete (300) is poured into the connecting space (S) and cured, the first wide girder (1) and the second wide girder (1) can be connected.

According to the slab construction method using a wide girder (1) according to one embodiment of the present invention as described above, the slab is constructed using a wide girder (1), so the manufacturing cost can be reduced, and rapid construction can be performed with excellent construction quality during assembly.

While the present disclosure has been illustrated and described above with reference to various embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the present disclosure as defined by the appended claims and their equivalents.

1; Wide girder 10; Body
20; upper recess 30; protrusion
40; protrusion 50; lower recess
60; Hook rebar 70; Rebar
100; Column 110; Support plate
120; connecting jaw 200; slab

Claims (5)

Body (10);
A pair of upper recesses (20) formed on the upper surface of both ends of the body;
A lower recess (50) formed in the center of the lower surface of the above body; and
It includes a plurality of hook reinforcing bars (60) installed at regular intervals in the longitudinal direction of the body on the upper surface of the body;
Each of the above pair of upper recesses (20) is
A pair of protrusions (30) formed so as to protrude toward each other from the inner surface of the upper recess at the entrance of the upper recess; and
It is characterized by including a plurality of protrusions (40) formed at regular intervals on the inner surface of the upper recess;
The above pair of protrusions (30) are formed to protrude toward each other from the inner surface of the upper recess, and are formed to protrude from the left inner surface and the right inner surface of the upper recess (20), respectively, so as to enhance the bonding strength and integrity of the concrete and the wire girder when pouring concrete into the upper recess to connect two wide girders (1).
The above plurality of protrusions (40) are formed to be arranged at regular intervals in the longitudinal and width directions of the body, and are formed at a plurality of intersection points where a plurality of virtual first straight lines (VL1) parallel to the longitudinal direction of the body and a plurality of virtual second straight lines (VL2) parallel to the width direction of the body intersect, and the above plurality of protrusions (40) are characterized in that they are positioned at the vertices of an imaginary square.
The above plurality of protrusions (40) are characterized in that they are spaced apart at an interval such that a reinforcing bar (70) can be inserted between two adjacent protrusions, so that the reinforcing bar (70) is positioned in the correct position and prevents the reinforcing bar (70) from moving when concrete is poured into the upper recess.
The lower recess (50) is formed between the pair of upper recesses (20), but is formed without interfering with the upper recess and the plurality of reinforcing bars (70), and is formed as a groove having a rectangular cross-section on the lower surface of the body, and is characterized in that it is formed so as not to penetrate the upper surface of the body.
A wide girder characterized in that the lower recess (50) includes a middle wall (51), and the middle wall (51) is installed at the center in the longitudinal direction of the lower recess to prevent distortion of the wide girder (1) and increase structural stability.
In paragraph 1,
A wide girder characterized in that both sides of the body include inclined surfaces inclined with respect to the lower surface.
In paragraph 1,
A wide girder characterized in that the plurality of protrusions of the upper recess are formed to be arranged at regular intervals in the length direction and width direction of the body.
A step of preparing a first wide girder and a second wide girder, respectively, according to claim 1;
A step of installing a plurality of columns, each of which includes a support plate formed at the top and a pair of connecting protrusions formed at both ends of the upper surface of the support plate, at a set interval from each other;
A step of forming a connecting space by arranging the first wide girder and the second wide girder on the support plates of the plurality of columns so as to face each other in the longitudinal direction with the pair of connecting jaws interposed therebetween, and connecting the upper recess of the first wide girder, the upper recess of the second wide girder, and the space between the pair of connecting jaws being connected;
A step of installing a plurality of slabs along the length of a pair of wide girders, while mounting both ends of the slab on a pair of wide girders installed in parallel in the width direction; and
A step of pouring and curing concrete on the connecting space, the upper surfaces of the first and second wide girders, and the upper surfaces of the plurality of slabs;
Each of the pair of upper recesses of the first wide girder and the second wide girder,
A pair of protrusions formed at the entrance of the upper recess so as to protrude toward each other from the inner surface of the upper recess; and
A slab construction method using a wide girder, characterized in that it includes a plurality of protrusions formed at regular intervals on the inner surface of the upper recess.
In paragraph 4,
A slab construction method using a wide girder, characterized in that the distance between the outer surfaces of a pair of connecting jaws of the above columns is the same as the width of the first wide girder and the width of the second wide girder.

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