WO2015072792A1 - Device for reinforcing resistance force of concrete post and method for reinforcing same - Google Patents

Abstract

The present invention relates to a device for reinforcing the resistance force of a concrete post and a method for reinforcing a concrete post, which can prevent an occurrence of a compression fracture due to an external force applied to the concrete post. The device for reinforcing the resistance force of a concrete post comprises: a hollow fastening rod installed to be able to slide along the longitudinal direction of a through-hole, which extends across the interior of a post made of concrete, a thread being formed on the inner peripheral surface of the fastening rod; a reinforcement plate fastened to surround the outer peripheral surface of the post; a screw portion having an end screw-coupled to a fastening member through the reinforcement plate; a coupling member having a head portion having a diameter larger than that of the screw portion so as to be supported on the outer peripheral surface of the reinforcement plate, thereby coupling the reinforcement plate to the post. The fastening rod is formed to be shorter than the distance between outer peripheral surfaces of the post. The aforementioned device for reinforcing the resistance force of a concrete post and the method for reinforcing the same are advantageous in that, while minimizing damage to an existing concrete structure, efficient reinforcement for preventing a compression fracture of a concrete post due to an external force acting on the concrete post is possible.

Description

Strength-bearing device of concrete column and its reinforcement method

The present invention relates to a load bearing reinforcement device and a method of reinforcing concrete pillars, and more particularly, a load bearing reinforcement device and a reinforcement thereof for introducing a confinement effect (confinement effect) to increase the strength of the existing concrete column It is about a method.

The structure is generally constructed to physically support the structures located at the top by a column.

Therefore, the column must be able to withstand the load of the structure and other loads on it, and also to withstand the external force applied in the horizontal direction such as earthquake or wind pressure. If the column does not withstand it, it collapses, and as a result, the physically supported superstructures are also forced to collapse. In particular, the seismic design of earthquakes in concrete columns is very important.

The method of reinforcing the concrete pillars has been posted in various ways such as Korean Patent Publication No. 10-2004-0057564, Korean Patent Registration No. 10-0498247.

As a method of reinforcing concrete columns, various methods such as fiber reinforcement, steel plate reinforcement, and cross-sectional expansion are applied depending on the site conditions. This method is to wrap the exterior of concrete column with one-way fiber sheet, fiber board, steel plate, and concrete. It is common to attach a fiber sheet or the like to the concrete pillar by using.

The method of reinforcing concrete columns using fiber sheets, such as carbon fibers or aramid fibers, has an excellent load-bearing effect while increasing the flexibility in the transverse direction. In addition, when the fiber sheet is attached to the surface of the pillar using a general epoxy resin, there is a problem that the work of removing bubbles formed on the attachment surface during construction is very cumbersome.

The present invention was created in order to solve the above problems, by inserting the fastening rods penetrating the existing concrete pillars installed and installing the reinforcement plate and then using the post-tension by using this to prevent the compressive fracture and concrete The purpose of the present invention is to provide a strength-bearing device and a method of reinforcing a concrete column, which can be reinforced and enhanced construction convenience.

In order to achieve the above object, the strength-reinforcement device of the concrete pillar according to the present invention is installed to be slidable along the longitudinal direction of the through hole crossing the interior of the pillar formed of concrete and has a hollow with a thread formed on the inner circumferential surface thereof. Rods; A reinforcing plate formed to surround an outer circumferential surface of the pillar; A coupling member for coupling the reinforcement plate to the pillar by having a screw portion through which the end portion is screwed to the fastening rod and a head portion having a diameter larger than the screw portion so as to be supported on an outer circumferential surface of the reinforcement plate; Is provided, the fastening rod is formed shorter than the distance between the outer peripheral surface of the pillar.

Preferably, the fastening rod is a first fastening rod which is inserted and installed to extend in a first direction across the pillar, and is installed on the upper or lower portion of the first fastening rod and extends in a direction crossing the first direction. A second reinforcing plate having a first fastening hole corresponding to the first fastening rod, and a second fastening hole corresponding to the second fastening rod, And a second reinforcing plate installed to surround the outer circumferential surface of the column together with the first reinforcing plate, wherein the coupling member penetrates the reinforcing plate through the first fastening hole or the second fastening hole and fastens the first fastening plate. It is formed to be fastened to the rod or the second fastening rod.

The coupling member is coupled to the upper portion of the head portion, the coupling member may be further provided with a pin tail which is separated from the head portion when the coupling rod is fastened to the fastening rod and the tensile force is set to the fastening rod and the coupling member. .

According to an aspect of the present invention, the reinforcement plate is formed of concrete and a plurality of reinforcement plate is applied to fasten to surround the outer circumferential surface of the pillar in the form of a polygonal column, the edge portion of the column where both ends of the reinforcement plate meet each other It is further provided; a corner cover member installed on.

More preferably, the pillar is formed as a square pillar having a cross section of a square, the fastening rod is a first fastening rod is inserted to be installed to extend in a first direction across the column, and the upper or lower portion of the first fastening rod It is installed and includes a second fastening rod extending across the column in a direction crossing the first direction, the reinforcing plate is formed with a first fastening hole corresponding to the first fastening rod is mutually The first reinforcement plate and the second reinforcing plate corresponding to the second fastening rods are formed to be in close contact with the two outer circumferential surfaces positioned side by side, respectively, and are installed on the other two side surfaces where the first reinforcing plate is not installed. And a second reinforcement plate surrounding the outer circumferential surface of the column together with a first reinforcement plate, wherein the edge cover member is installed to surround four corners of the column. The first reinforcing plate and the second reinforcing plate are formed so that both ends cover the corner cover member.

In addition, to achieve the above object, the method of reinforcing the strength of a concrete pillar according to the present invention is for reinforcement of a pillar formed of concrete, and drilling a through-hole crossing the inside of the pillar; A fastening rod insertion step of inserting and installing a fastening rod having a thread formed on an inner circumferential surface thereof and slidably inserting a fastening rod shorter than the length of the through hole into the through hole; A reinforcing plate installation step of adding a reinforcing plate to the outer circumferential surface of the pillar; And a coupling member coupling step of screwing an end portion of the coupling member penetrating the reinforcement plate to the coupling rod to fix the reinforcement plate to the pillar and introducing a tensile force between the coupling rod and the coupling member.

The drilling step may include a first drilling step of drilling a first through hole by drilling along a first direction crossing the pillar, and a second crossing of an extension direction of the first through hole at an upper or lower portion of the first through hole. And a second drilling step of drilling a second through hole along a direction, wherein the fastening rod insertion step includes a first fastening rod insertion step inserted into the first through hole and a second insertion hole inserted into the second through hole. And a fastening rod insertion step, wherein the reinforcement plate installation step comprises: a first reinforcement plate installation step of installing a first reinforcement plate having a first fastening hole through which the coupling member penetrates corresponding to the first through hole; And a second reinforcing plate installation step of installing a second reinforcing plate having a second fastening hole through which the coupling member penetrates corresponding to the second through hole.

The pillar is formed of concrete and has a polygonal pillar shape, and a cover member installation step of installing a corner cover member at an edge portion of the pillar between the fastening rod insertion step and the reinforcement plate installation step may be further included.

Strength bearing device and reinforcement method of the concrete pillar according to the present invention has the advantage that can be efficiently reinforced to prevent the compression destruction of the concrete pillar by the external force acting on the concrete pillar while minimizing the damage of the existing concrete structure.

1 is a perspective view showing a column in which a reinforcement device of a concrete pillar is installed according to an embodiment of the present invention;

Figure 2 is an exploded perspective view showing the separation of the reinforcement device of the concrete pillar of Figure 1,

3 is a plan sectional view of a column reinforced through the reinforcement device of the concrete column of FIG.

Figure 4 is a perspective view showing another embodiment of the coupling member applied to the present invention,

5 and 6 are cross-sectional views showing a process of fastening the coupling member of FIG.

7 is a perspective view for explaining the drilling process in the reinforcement method of the concrete column according to the present invention,

8 is a perspective view for explaining a fastening rod installation process in a method of reinforcing a concrete column according to the present invention;

Figure 9 is a perspective view for explaining the installation process of the reinforcement plate in the reinforcement method of the concrete column according to the present invention,

10 is a perspective view showing a state in which a reinforcement device of a concrete column according to the present invention is installed in a circular concrete column,

Figure 11 is an exploded perspective view of the reinforcement device of the concrete column of Figure 10,

12 is a perspective view showing a column in which a reinforcing device for a concrete column is installed according to another embodiment of the present invention;

Figure 13 is an exploded perspective view showing the reinforcement device of the concrete pillar of Figure 12,

14 is a plan sectional view of a column reinforced by the reinforcement device of the concrete column of FIG. 13,

15 is a view showing another example of the process of coupling through the coupling member to the pillar of Figure 12,

16 is a perspective view for explaining a corner cover member installation process,

FIG. 17 is a perspective view illustrating a reinforcing plate installation process after installing the corner cover member of FIG. 16. FIG.

Hereinafter, with reference to the accompanying drawings will be described in more detail the reinforcing device and concrete reinforcement method of the concrete pillar according to an embodiment of the present invention.

1 is a perspective view showing a column in which a reinforcement device of a concrete column is installed according to an embodiment of the present invention, FIG. 2 is an exploded perspective view illustrating a reinforcement device of the concrete column of FIG. 1, and FIG. 3 is of FIG. 2. A plan cross-sectional view of a column reinforced by a reinforcement device for a concrete column.

1 to 3, the reinforcement device 100 of the concrete pillar according to an embodiment of the present invention is the first and second fastening rods (111, 112) inserted into the pillar 10 made of concrete, and The first and second reinforcement plates 121 and 122 surrounding the outer circumferential surface of the column 10, and the first and second reinforcement plates 121 and 122 to fix the first and second reinforcement plates 121 and 122 to the column 10. It includes a coupling member 130 penetrated through the first and second fastening rods (111, 112).

Concrete pillar 10 of the present embodiment has a cross-section of the square, the first fastening rods 111 are two parallel to extend along a first direction passing through two surfaces located in the parallel direction of the concrete pillar 10 To be installed.

The first fastening rod 111 is a hollow body having a predetermined hollow, and a thread 111a for fastening with the coupling member 130 to be described later is formed on the inner circumferential surfaces of both edges.

The second fastening rod 112 is installed on the upper or lower portion of the first fastening rod 111 and is inserted into and installed in the column 10 so as to extend in a second direction crossing the first direction and the first fastening rod ( Like 111, a hollow is formed inside, and a thread 112a for fastening the coupling member 130 is formed at the edge side.

The first fastening rods 111 and the second fastening rods 112 are both first and second through-holes respectively formed in the pillars 10 for installation of the first fastening rods 111 and the second fastening rods 112. It is formed shorter than the length of the holes (141, 142).

The reinforcement plate is coupled to the outer circumferential surface of the column 10, and as described above, the first reinforcement plate 121 is fastened to two sides in the form of a column 10 having a rectangular cross section and positioned in parallel directions. ) And the second reinforcing plate 122 installed on the other two side surfaces in the direction intersecting the surface to which the first reinforcing plate 121 is fastened.

The first reinforcing plate 121 is fastened to two side surfaces at which the first through hole 141 is formed for the installation of the first fastening rod 111. The first fastening hole corresponding to the first fastening rod 111 ( 123 is formed.

In addition, the second reinforcing plate 122 is installed on two sides of the second through-hole 142 is formed for the installation of the second fastening rod 112, the second fastening corresponding to the second fastening rod 112 The hole 124 is formed.

The first reinforcing plate 121 and the second reinforcing plate 122 is in close contact with the pillar 10 by the coupling member 130.

As described above, the coupling member 130 penetrates through the first and second reinforcement plates 121 and 122, respectively, and is coupled to the first fastening rod 111 or the second fastening rod 112, and thus the first and second reinforcement plates 121 and 122 are used. ) Is tightly coupled to the pillar (10).

The coupling member 130 is a screw portion 131 which is screwed to the first fastening rod 111 or the second fastening rod 112 through the first fastening hole 123 or the second fastening hole 124, The head portion 132 is provided at the end of the screw portion 131.

A screw thread is formed on the outer circumferential surface of the screw part 131, and the head part 132 is formed to have an outer diameter relatively larger than the diameter of the first fastening hole 123 or the second fastening hole 124. The head portion 132 is formed in a hexagonal shape so as to rotate the screw portion 131 using a fastening tool such as a spanner.

When the coupling member 130 is mounted in a state in which the first reinforcing plate 121 and the second reinforcing plate 122 are in contact with the outer circumferential surface of the column 10, the first fastening rod 111 may be installed in the case of the first fastening rod 111. Coupling members 130 that penetrate the first reinforcing plate 121 on both sides of the) are screwed, respectively, even in the case of the second fastening rod 112, the second reinforcing plate (112) on both sides of the second fastening rod (112) The coupling member 130 penetrating through 122 is screwed.

When the coupling member 130 is screwed and rotated at both sides of the first fastening rod 111 or the second fastening rod 112, both sides of the first fastening rod 111 and the second fastening rod 112 are pulled out. Post tension is applied to the column 10.

The coupling member 130 may further include a pin tail 133 to easily fit the size of the post tension as shown in FIGS. 4 to 6.

The pin tail 133 is attached to the head portion 132 and the spline is formed on the outer circumferential surface, the pin tail 133 is automatically the head portion when a torque of a predetermined size is applied, such as a torque shear bolt (torque shear bolt) It is to be separated from the 132 to fasten the coupling member 130 with a constant torque.

That is, the fastening mechanism for installing the coupling member 130 of the present embodiment includes a first clamping portion 151 for clamping the head portion 132 and a second clamping portion 152 for clamping the pin tail 133. The first clamping part 151 and the second clamping part 152 rotate together to turn the head part 132 and the pin tail 133 to screw the coupling member 130 to the fastening rod. As the coupling progresses, the magnitude of the torque applied to the first clamping part 151 and the second clamping part 152 increases gradually. The pin tail 133 is separated from the head 132 when a torque greater than or equal to a predetermined size is applied, and an operator may stop the fastening at the time point at which the pin tail 133 is separated, thereby installing a post tension of a predetermined size.

The reinforcement method of the concrete column 10 using the reinforcement device 100 of the concrete column according to the present invention described above is as follows.

As shown in FIG. 7, first, the first through hole 141 and the second through hole 142 for installing the first fastening rod 111 and the second fastening rod 112 in the concrete pillar 10 are drilled. do.

In the drilling step, the concrete pillars 10 are bored to drill the first and second through holes 141 and 142 corresponding to the outer diameters of the first and second fastening rods 111 and 112. The first and second through holes 141 and 142 are formed to extend in a first direction and a second direction, respectively, extending in directions crossing each other.

When the first and second through holes 141 and 142 are drilled, the first and second fastening rods 111 and 112 are inserted into and installed in the first and second through holes 141 and 142, as shown in FIG.

In the fastening rod insertion step, the first fastening rods 111 are formed in the first and second through holes 141 and 142, and the second fastening rods 112 are formed in the second through holes 142. Insert and install. Since the first and second fastening rods 111 and 112 are both shorter in length than the first through hole 141 and the second through hole 142, the first and second fastening rods 111 and 112 are formed of the first and second fastening rods 111 and 112. The end portions are installed so as to be brought into a predetermined depth from the outer circumferential surface of the pillar 10, respectively. The first and second fastening rods 111 and 112 are buried in the pillar 10 so as to be slid or rotate along the longitudinal direction of the first and second through holes 141 and 142.

After the installation of the first and second fastening rods 111 and 112 is finished, the first reinforcing plate 121 and the second reinforcing plate 122 are attached to the outer surface of the column 10, respectively, as shown in FIG. 9, The first and second reinforcement plates 121 and 122 are fixed to the pillars 10 through the coupling member 130.

The coupling member 130 may be formed by screwing the screw 131 through the first fastening hole 123 or the second fastening hole 124 formed in the first reinforcing plate 121 or the second reinforcing plate 122. 1 is fastened to the hollow of the fastening rod 111 or the second fastening rod 112, the head portion 132 by pressing the first reinforcing plate 121 or the second reinforcing plate 122 to the pillar 10 side Fixation is made.

Particularly, when fastening the coupling member 130, the coupling member is applied to the fastening rod and the coupling member 130 such that a force having a predetermined size is applied through a fastening mechanism such as a torque wrench so that post tension for reinforcing the pillar 10 may be applied. 130).

Of course, through the coupling member 130 is attached to the pin tail 133, as shown in the embodiment shown in Figures 4 to 6 can also fasten the coupling member 130 to take a post tension of a certain size without a separate measuring mechanism have.

10 and 11 show another embodiment of the reinforcement device 200 of the concrete column capable of reinforcing the circular concrete column 20.

In the present embodiment, the pillar 20 is formed in a cylindrical shape, and the plurality of third through holes 211 are formed to be spaced apart vertically so as to extend across the center of the pillars. A fourth through hole 212 is provided to extend in a direction crossing the third through hole 211 at an upper portion or a lower portion thereof, and a third fastening to be inserted into the third through hole 211 and the fourth through hole 212. The rod 241 and the fourth fastening rod 242 are installed.

Both the third fastening rods 241 and the fourth fastening rods 242 are applied to those formed with a shorter length than the diameter of the pillar 20.

The third reinforcing plate 221 and the fourth reinforcing plate 222 are installed on the outer circumferential surface of the column 20, and the third fastening rods 241 are respectively provided on the third reinforcing plate 221 and the fourth reinforcing plate 222. And a third fastening hole 223 and a fourth fastening hole 224 corresponding to the fourth fastening rod 242, respectively, which are positioned at opposite positions with respect to the center point of the pillar 20. The third reinforcement plate 221 and two fourth reinforcement plates 222 surround the outer circumferential surface of the column.

In addition, the coupling member 230 is screwed to the thread formed in the hollow of the third fastening rod 241 and the fourth fastening rod 242 through the third fastening hole 223 or the fourth fastening hole 224. , The fourth reinforcing plates (221, 222) are in close contact with the pillar.

Each of the third reinforcement plate 221 and the fourth reinforcement plate 222 has a first inlet groove 225 drawn outward from the inner circumferential surface at one edge thereof, and a second inlet drawn inward from the outer circumferential surface at the other edge thereof. Groove 226 is formed, it is preferable to form so that one edge of the reinforcement plate is superimposed on the other edge of the adjacent reinforcement plate.

The reinforcement device 200 of the concrete pillar of the present embodiment is also fastened to the reinforcing plate 221, 222 through the coupling member 230 at both ends of the fastening rods 241, 242 extending across the column 20. Post-tension is introduced and reinforcement is achieved by pressing the column 20 by the reinforcement plates 221 and 222.

Meanwhile, another embodiment of the present invention will be described with reference to FIGS. 12 to 14. Elements having the same function as in the above-described drawing are denoted by the same reference numerals.

12 to 14, the reinforcement device 300 of the concrete pillar is disposed at four corners of the pillar 10 between the first and second reinforcement plates 121 and 122 and the pillar 10 having a rectangular cross section. Further provided with a corner cover member 150 is installed.

The edge cover member 150 is installed at four corners of the pillar 10 and is formed in a 'b' shape so as to cover adjacent side surfaces of the pillar 10.

The edge cover member 150 is covered at both ends of the first and second reinforcement plates 121 and 122 when the first and second reinforcement plates 121 and 122 are installed, and thus, together with the first and second reinforcement plates 121 and 122. By being in close contact with the pillar 10, it is possible to provide adhesion over the entire outer circumferential surface of the pillar 10.

The edge cover member 150 may be formed to have a thickness thinner than that of the first and second reinforcement plates 121 and 122.

Both edge regions of the first reinforcing plate 121, the edge cover member 150 is in close contact with the first reinforcement plate 121 in a seated state while the inner side is thinly inserted so that the edge cover member 150 can be seated. A seating groove 121a is formed so that the overlapped portions of the edge cover member 150 may have the same thickness as the non-overlapping portions.

In addition, both edge regions of the second reinforcing plate 122 that the edge cover member 150 of the second reinforcing plate 122 is in close contact with each other may be seated while the inside of the edge cover member 150 may be seated. In the second reinforcing plate 122 and the corner cover member 150, the overlapping portion of the non-overlapping portion and the thickness of the non-overlapping portion is formed with a mounting groove (122a).

The first and second reinforcement plates 121 and 122 may be coupled to each other by applying the coupling member 130 having the pin tail 133 as shown in FIG. 15.

The reinforcement method of the concrete column 10 using the reinforcement device 300 of the concrete column according to the present invention described above is as follows.

As described above with reference to FIGS. 7 and 8, first through holes 141 and second through holes for installing the first fastening rods 111 and the second fastening rods 112 on the concrete pillars 10. The hole 142 is drilled and the first and second fastening rods 111 and 112 are inserted into the first and second through holes 141 and 142.

After the installation of the first and second fastening rods 111 and 112 is completed, the corner cover members 150 are mounted at four corners of the pillar 10 as shown in FIG. 16.

The edge cover member 150 may be directly coupled to the pillar 10 through a separate adhesive or coupling means, and although not shown, the edge cover member 150 may be bonded or bonded to the first reinforcement plate 121 and the first reinforcement plate 121. You can also

After mounting the edge cover member 150, as shown in FIG. 17, the first reinforcement plate 121 and the second reinforcement plate 122 are attached to the outer surface of the column 10, respectively, and the coupling member 130. The first and second reinforcement plates 121 and 122 may be fixed to the pillars 10 through the pillars 10.

Claims (8)

A fastening rod installed to be slidable along a longitudinal direction of the through hole traversing the interior of the pillar formed of concrete and having a hollow having a thread formed on an inner circumferential surface thereof; A reinforcing plate formed to surround an outer circumferential surface of the pillar; A coupling member for coupling the reinforcement plate to the pillar by having a screw portion through which the end portion is screwed to the fastening rod and a head portion having a diameter larger than the screw portion so as to be supported on an outer circumferential surface of the reinforcement plate; Equipped with The fastening rod is a strength of the concrete reinforcement device, characterized in that formed shorter than the distance between the outer peripheral surface of the column. The method of claim 1, The fastening rod may include a first fastening rod inserted into and extending in a first direction crossing the pillar, and a second fastening rod installed in an upper or lower portion of the first fastening rod and extending in a direction crossing the first direction. Including, The reinforcing plate has a first reinforcing plate having a first fastening hole corresponding to the first fastening rod, and a second fastening hole corresponding to the second fastening rod, and is formed together with the first reinforcing plate. It includes a second reinforcement plate is installed to surround the outer peripheral surface of the pillar, The coupling member is a load bearing reinforcement device of the concrete pillar, characterized in that formed through the reinforcing plate through the first fastening hole or the second fastening hole to be fastened to the first fastening rod or the second fastening rod. The method of claim 2, The coupling member is coupled to an upper portion of the head portion, and the coupling member is fastened to the fastening rod further comprises a pin tail separated from the head portion when a tension force equal to or greater than a predetermined size is set to the fastening rod and the coupling member. Strength-bearing device of concrete column. According to claim 1, The reinforcement plate is formed of concrete and a plurality of reinforcement plate is applied to fasten so as to surround the outer circumferential surface of the pillar of the polygonal pillar shape, Strength-bearing device of a concrete column further comprises a; edge cover member is installed on the corner portion of the column where both ends of the reinforcing plate meet each other. The method of claim 4, wherein The pillar is formed of a square pillar having a rectangular cross section, The fastening rod may include a first fastening rod inserted into and extending in a first direction crossing the pillar, and installed on an upper or lower portion of the first fastening rod and extending across the pillar in a direction crossing the first direction. Including a second fastening rod, The reinforcing plate may include a first reinforcing plate formed to have a first fastening hole corresponding to the first fastening rod, and installed to be in close contact with two outer circumferential surfaces of the pillar, respectively, and a first corresponding to the second fastening rod. 2 fastening holes are formed, the second reinforcing plate is installed on the other two side which is not installed includes a second reinforcing plate surrounding the outer peripheral surface of the column with the first reinforcing plate, The corner cover member is installed to surround the four corners of the pillar, the first reinforcement plate and the second reinforcement plate is characterized in that the strength of the concrete pillar characterized in that both ends are formed to cover the corner cover member . For reinforcement of columns formed of concrete, A drilling step of drilling a through hole crossing the inside of the pillar; A fastening rod insertion step of inserting and installing a fastening rod having a screw thread formed on an inner circumferential surface thereof and slidably inserting a fastening rod shorter in length than the length of the through hole; A reinforcing plate installation step of adding a reinforcing plate to the outer circumferential surface of the pillar; And a coupling member coupling step of screwing an end portion of the coupling member penetrating the reinforcement plate to the coupling rod to fix the reinforcement plate to the pillar and introducing a tensile force between the coupling rod and the coupling member. Strength method of concrete column The method of claim 6, The drilling step may include a first drilling step of drilling a first through hole by drilling along a first direction crossing the pillar, and a second crossing of an extension direction of the first through hole at an upper or lower portion of the first through hole. A second drilling step of drilling the second through hole along the direction; The fastening rod insertion step includes a first fastening rod insertion step inserted into the first through hole and a second fastening rod insertion step inserted into the second through hole, The reinforcing plate installation step may include a first reinforcing plate installation step of installing a first reinforcement plate having a first fastening hole through which the coupling member penetrates corresponding to the first through hole, and corresponding to the second through hole. And a second reinforcing plate installation step of installing a second reinforcing plate having a second fastening hole through which the coupling member penetrates. The method of claim 6, wherein the pillar is formed of concrete and has a polygonal pillar shape, Cover member installation step of installing a corner cover member in the corner portion of the column between the fastening rod insertion step and the reinforcing plate installation step; further comprising the strength of the concrete pillars.

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