KR20220149983A - Joint structure between improved CFT column and prefabricated beam with concrete form - Google Patents

Abstract

The present invention relates to a joint structure for a mold-prefabricated steel beam (2) and a concrete-filled steel tube (CFT) column (1), which is joined to a space (a) by complete joint penetration of deposited metal. The space (a) is formed as a cover plate (12) is added to a part to which ends of a bent steel plate (11) are connected by being spaced at fixed intervals. The joint structure for a mold-prefabricated steel beam (2) and a CFT column (1) comprises: a side panel (20) installed on one side and an opposite side of the CFT column (1) and comprising a bottom unit (21) and a side unit (22) accommodating concrete placed in a joint part of the mold-prefabricated steel beam (2) and the CFT column (1) while the side panel (20) integrally connects the CFT column (1) and the mold-prefabricated steel beam (2) to be continuous; and a support panel (30) integrally formed by being in contact with the bottom unit (21) of the side panel (20), and protruding more than both ends of the side panel (20) to support the mold-prefabricated steel beam (2).

Description

Joint structure between improved CFT column and prefabricated beam with concrete form}

The present invention relates to a joint structure of a CFT column and a formwork line assembly type beam of a building structure, and more particularly, a CFT column that joins the formwork line assembly type beam to the CFT column joined by fully penetrating the deposited metal into the space formed using the backing plate. It is related to the joint structure of the formwork line assembly type beam.

In recent construction work, as the number of construction specialists decreases and labor costs increase, a dry construction method using a PC (precast) member is applied to shorten the construction period. In the case of a beam, which is a horizontal member corresponding to a flat part of a building structure, a beam with reinforcing bars pre-attached to a steel plate form used as a permanent member is called a formwork prefabricated beam, a beam structure formwork, a prefabricated formwork beam, a DH beam, or a beam formwork. Hereinafter, in the present invention, as described above, a beam in which concrete is poured into a steel plate formwork used as a permanent material will be called a formwork prefabricated beam.

In addition, the vertical member corresponding to the vertical part is also changing to a PC column or CFT column (Concrete Filled Steel Tube Column) being applied a lot in the field. Therefore, there is a problem in that the installation is complicated and space is limited,

And the CFT column is a closed cross-section member that combines the strengths of steel and concrete. The steel pipe column bearing the bending moment is on the outside and the concrete bearing the axial force is on the inside. By increasing the strength and bearing capacity and at the same time allowing the steel pipe column to use up to an allowable stress without being easily buckled, it greatly improves the member strength and deformability of the steel pipe column and concrete, while increasing the efficiency of the section.

In general, the steel pipe column applied to the CFT column is made by assembling and welding a plurality of prefabricated closed-type steel frame members using a bent steel plate to have an empty, closed-type cross section. As shown in FIG. 1, in the assembly of a steel pipe column, the installation-type assembly box steel pipe" is a bent steel plate having bent portions 110b bent inward at both ends after manufacturing an L-shaped unit member 110, the bent portion 110b ) to form a square by connecting the L-shaped unit members 110 to each other so that the surface contact, and then welding the part where the unit member 110 and the unit member 110 abut using a partial penetration technique to form a steel pipe column, The CFT column is completed by pouring concrete inside it.

That is, both ends of the L-shaped unit member 110 applied to the steel pipe column are bent inward, so that the welding metal is completely penetrated into the entire thickness of the portion where the unit member 110 and the unit member 110 meet. Since it is impossible, the connection portion between the unit member 110 and the unit member 110 becomes weak, and there is a problem in that the stress that the CFT column resists buckling or bending force is lowered. In addition, when an external horizontal force such as a lateral force is applied to a CFT column formed by pouring concrete on a steel pipe column in which the unit member 110 having the bent portion 110b and the unit member 110 are welded together, the external force is the bending portion of the steel pipe column. Due to the concentration along 110b, the contact surface between the bent portion 110b and the concrete causes a sliding phenomenon, which causes a stress loss in the CFT column. Although studs are installed at intervals to integrate the steel pipe column and concrete, it takes a lot of work time to install the studs on the steel pipe column, and there is a limit to compensating for the stress loss with the studs.

In addition, the CFT column is lighter than the PC column and has excellent workability, but since the exterior is all made of steel plate and most are used without a separate coating, when connecting the CFT column and the beam by welding, etc., it is essential to secure the stability of the welded part. Since the force applied from the beam connected to the CFT column is applied to the coated steel pipe column of the CFT column as it is, there is a structural limit to the steel pipe column itself formed from the steel plate. are installing

In particular, as the CFT column, which is a vertical member, is mainly responsible for the shear force generated by being transmitted from the beam, which is a horizontal member, in the joint between the CFT column and the beam. The thin shell constituting the column, the steel plate, is torn to cause local destruction or, in severe cases, the joint of the two members is broken.

Republic of Korea Patent Publication No. 10-2019-0124561 "Joint structure and floor structure of column member and wide beam" is to improve the joint performance of the joint part of the wide beam consisting of CFT columns and reinforced concrete beams, In the patented invention, the reinforced shear reinforcement is connected in a direction intersecting with the column member and provided to form a pair with a wide beam installed to surround the cross section of the column member, respectively joined to both sides of the column member and embedded in the concrete member of the wide beam However, in the previous patented invention, the moment or shear force generated by the force applied from the wide beam to the CFT column is applied to the shear reinforcement, and the external force that the shear reinforcement is responsible for is transferred to the steel sheet covering the CFT column. In addition to stress concentration, the shear reinforcement is installed only in the same direction as the reinforced concrete beam connected to the longitudinal CFT column, so there is a structural limit in responding to the punching shear force generated throughout the circumference of the CF column.

In addition, the joint part for connecting and joining the CFT column and the formwork prefabricated beam requires a form that can accommodate it when pouring concrete as shown in Figs. 2a and 2b. After the concrete has cured, there is a hassle of dismantling the installed formwork and copper bar.

Republic of Korea Patent Publication No. 10-1367626 Republic of Korea Patent Publication No. 10-2019-0124561

Accordingly, in view of the various problems of the prior art as described above, the present invention relates to a CFT column formwork line assembly type beam joint structure,

An object of the present invention is to increase the rigidity of the joint by fully penetrating and joining the welded metal in the space formed by padding the bent steel plate and the bent steel plate used for the steel pipe column of the CFT column as a backing plate to increase the bending stress of the CFT column. have.

In addition, the present invention is to provide a way to increase the bending stress of the CFT column by changing the bent portion of the bent steel sheet and the shape of the backing plate applied to the bent portion.

In addition, the present invention integrates the steel pipe column with the concrete poured inside by installing the studs on the backing plate inside the CFT column, suppresses the occurrence of sliding on the joint surface of the steel tube column and the concrete, and simultaneously transfers the bending force applied to the outside to the inside of the concrete It is intended to provide an even distribution.

In addition, the present invention provides an efficient response to the punching shear force generated around the periphery of the CFT column by integrally installing the side plate panel and the support panel on the CFT column in the bonding of the CFT column and the formwork prefabricated beam.

In addition, in the present invention, by installing a side plate panel using a support panel on a CFT column in advance in the joining of a CFT column and a formwork prefabricated beam, without installing a separate side plate form and a copper bar, it can be It is to provide a thing that can easily pour concrete.

In addition, the present invention is to provide a thing that can omit the installation of a separate copper bar to the prefabricated beam since it is possible to connect the prefabricated beam over the protrusion of the support panel in the joining of the CFT column and the formwork prefabricated beam.

The present invention is to solve the above problems, and the end of the bent steel sheet and the end of the bent steel sheet are spaced apart from each other and face to face, and the space formed by the padded over the spaced portion is completely penetrated by the welded metal. CFT column, which is formed integrally by pouring concrete inside the steel pipe column formed by joining, and pouring at the junction of the CFT column and the formwork prefabricated beam while continuously connecting it with the formwork prefabricated beam on one side and the opposite side of the CFT column A side plate panel consisting of a floor and a side part for accommodating the concrete to be used, a support panel that is formed integrally with the bottom surface of the bottom part of the side plate panel and protrudes from both ends of the side plate panel to support the formwork prefabricated beam, and a CFT column The purpose of this study is to provide a joint structure of a formwork pre-assembly type beam of a CFT column consisting of a reinforcing rib that is joined to the lower surface of the support panel and supports the support panel.

In addition, in the present invention, each end of the bent steel sheet has a bent part vertically bent inward, and the back plate padded to the spaced part is formed in a 'ㅗ' shape or a '+' shape so that it is fitted in close contact between the bent parts. It is intended to provide a joint structure of a formwork line assembly type beam of a CFT column, characterized in that the space is formed between the upper end of the vertical part of the fitted 'ㅗ' or '+'-shaped backing plate and both bent parts.

The present invention increases the rigidity of the joint by joining the bent steel plate and the bent steel plate used for the steel pipe column of the CFT column by full penetration of the deposited metal in the space formed by padding the back plate, and by changing the shape of the back plate, the bending stress of the CFT column is reduced. heightening effect.

In addition, the present invention integrates the steel pipe column with the concrete poured inside by installing the studs on the backing plate inside the CFT column, suppresses the occurrence of sliding on the joint surface of the steel tube column and the concrete, and simultaneously transfers the bending force applied to the outside to the inside of the concrete It has the effect of distributing it evenly.

In addition, the present invention has the effect of effectively responding to the punching shear force generated around the CFT column by installing the side plate panel and the support panel on the CFT column integrally in the bonding of the CFT column and the formwork line assembly type beam.

In addition, the present invention has the effect of easily pouring concrete without the need to install a separate side plate form at the joint site by installing a side plate panel using a support panel on the CFT column in advance in the joining of the CFT column and the formwork prefabricated beam. have.

In addition, the present invention has the effect of omitting the installation of a separate copper bar in the prefabricated beam since the present invention can connect the prefabricated beam over the protrusion of the support panel in the joining of the CFT column and the formwork prefabricated beam.

1 is an exploded perspective view of a conventional CFT column;
Figures 2a and 2b are an elevation view and a partial perspective view of the formwork and the copper bar used when the conventional CFT column and the formwork line assembly type beam are connected.
3a to 3c are an exploded perspective view and a combined perspective view of a steel pipe column to which a '-' shaped back plate is applied in the present invention, and a perspective view in which a reinforcement bar is installed on the back plate;
4A to 4C are an exploded cross-sectional view of a steel pipe column to which an 'ㅗ'-shaped backing plate is applied in the present invention, a cross-sectional view in which the steel pipe column is combined to form a space so that the welded metal is completely penetrated, and a cross-sectional view in which the welded metal is completely penetrated;
5 is a cross-sectional view of a steel pipe column to which a '+'-shaped pad is applied in the present invention;
6 is a cross-sectional view of a steel pipe column to which a '‡'-shaped pad is applied in the present invention;
7 is a cross-sectional view of a CFT column formed with a fire resistant coating in the present invention;
8a and 8b are exploded perspective views showing the formwork line assembly type beam joint structure of the CFT column in the present invention;
9a is a cross-sectional view taken along line AA of FIG. 8a showing the formwork line assembly type beam joint structure of the CFT column in the present invention, and 9b is an elevation view showing the formwork line assembly type beam joint structure of the CFT column in the present invention.
10 is a plan view of the formwork line assembly type beam joint structure of the CFT column in the present invention;
11 is a cross-sectional view of a state in which the CFT column and the CFT column are connected in the present invention.

Hereinafter, the present invention will be described in detail based on the accompanying drawings, but the presented embodiments are illustrative for a clear understanding of the present invention, and the present invention is not limited thereto. same.

3a to 3c are respectively an exploded perspective view and a combined perspective view of a steel pipe column to which a '-'-shaped backing plate is applied in the present invention, and a perspective view in which a reinforcing bar is installed on the backing board. 3a and 3b show that each end of the bent steel sheet 11 has a vertical cross-section, and the end of the bent steel sheet 11 and the end of the bent steel sheet 11 are spaced apart from each other and are abutted, and the number of padded on the spaced portion A CFT column ( 1) is made, wherein the studs 13 are welded to the back plate 12 in the inner direction of the back plate 12, or the reinforcement bar 14 is welded at regular intervals between the back plate 12 and the back plate 12. is integrally connected with

That is, the weld metal is completely penetrated and welded into the space (a) formed by adding the horizontal plate-formed back plate 12 to the inner surface of the part spaced apart from the end of the bent steel plate 11 and the end of the bent steel plate 11. Unlike the conventional steel pipe column 10 described in 1, the joint portion of the bent steel plate 11 and the bent steel plate 11, which is a weak part of the steel pipe column 10, was further strengthened to increase the stress against the external bending force, and also By installing the studs 13 at (12), the stress loss caused by the sliding phenomenon occurring between the steel pipe column 10 and the concrete poured inside the steel pipe column 10 was prevented. Figure 3c shows that the reinforcement 14 is integrally connected by welding at regular intervals between the back plate 12 and the back plate 12 instead of the studs 13 installed on the back plate 12, so that the back plate 12 and the reinforcement plate 14 are connected to each other. As a result, the bending stress is further increased and the steel pipe column 10 and concrete are integrated by the reinforcing bar 14, thereby reducing the sliding phenomenon in which the steel pipe column 10 and the concrete are separated, as well as strengthening the internal stress of the steel pipe column 10 It has the function of a diaphragm.

Figures 4a to 4c are an exploded perspective view and a combined perspective view of a steel pipe column to which an 'ㅗ'-shaped backing plate is applied in the present invention. 4b is a cross-sectional view showing the space (a) in which the welded metal is penetrated by combining the bent steel plate 11 and the 'ㅗ'-shaped back plate 12 constituting the steel pipe column 10 before the welding joint, and FIG. 4c is It is a cross-sectional view in which the welded metal is penetrated and joined to the space formed by combining the bent steel plate 11 and the 'ㅗ'-shaped backing plate 12. As shown in FIGS. 4b and 4c, each end of the bent steel plate 11 has a bent portion 11a vertically bent inward, and the vertical portion 12b of the backing plate 12 that is padded on the spaced apart portion is the bent portion ( 11a), the horizontal portion 12a is in close contact with the end of the bent portion 11a in the 'V'-shaped backing plate 12 formed of the horizontal portion 12a and the vertical portion 12b. The space (a) formed between the upper end of the vertical portion 12b of the fitted 'ㅗ'-shaped backing plate 12 and both bent portions 11a is formed as shown in FIG. 4b, and the deposited metal is completely formed in the space (a) thus formed. The configuration in which the penetration is welded is shown in Fig. 4c, which also includes the bent steel plate 11 and the bent steel plate using the 'ㅗ'-shaped back plate 12 in the bent steel plate 11 having the bent portion 11a. While forming the steel pipe column 11 that is strongly and integrally joined, the joint portion of the bent portion 11a and the bent portion 11a, which are the ends of the bent steel sheet 11, is strengthened to further increase the stress against the external bending force.

5 shows that each end of the bent steel plate 11 in the present invention has a bent portion 11a vertically bent inward, and the backing plate 12 padded to the spaced portion is inserted in close contact between the bent portions 11a. However, in the '+'-shaped backing plate 12 formed in such a way that the horizontal portion 12a and the vertical portion 12b intersect with each other, the vertical portion 12b is closely fitted between the bent portions 11a, and the horizontal portion (12b) is in close contact with the end of the bent portion (11a). It consists of a configuration in which the weld metal is completely penetrated and welded to the space (a) formed between the upper end of the vertical part 12b and the both bent parts 11a of the inserted '+'-shaped backing plate 12, and the bent steel plate 11 The vertical portion 12b to the 'ㅗ'-shaped backing plate 12 where bending stress is required more than the 'ㅗ'-shaped backing plate 12 in the bent part 11a, which is the joint part of the bent steel plate 11 and By applying the '+'-shaped back plate 12 with further reinforcement, there is an effect that the bending stress can be further reinforced without installing a separate member or diaphragm.

6 is a '‡'-shaped backing plate 12 in the present invention, one vertical part 12b is added to a portion spaced apart between the bent parts 11a vertically bent to the inside, and it is fitted in close contact with it. A space (a) through which the deposited metal can be completely penetrated is formed between the upper end of the vertical portion 12b of the ‡'-shaped backing plate 12 and both bent portions 11a. And the back plate 12 applied in FIG. 6 is a horizontal part 12a and a vertical part 12b one more added compared to the back plate 12 applied in FIG. ), it can be applied to a place that requires more bending stress, and at the same time, the ‡'-shaped backing plate 12 itself also serves as a stud 13, so the integrity of the steel pipe column 10 and the concrete is improved. It has a higher function.

7 is a cross-sectional view of the CFT column 1 on which the fire resistant coating 60 is formed. The CFT column 1 is lighter than the PC column, while the steel plate column 10 constituting the outer shell of the CFT column 1 is formed of a steel plate. Therefore, it is vulnerable to fire, and in order to meet the required fire resistance standards, the cost increases due to the increase in the thickness of the steel plate, etc. Accordingly, in order to have an economical structure while increasing the fire-resistance performance of the CFT column (1), a wire mesh 61 is installed over the outer peripheral surface of the CFT column (1), and a mortar is poured to provide a fire-resistance coating (60) of the CFT column (1). ) to form

8a and 8b are exploded perspective views showing the joint structure of the formwork line assembly of the CFT column, FIG. 9a is a cross-sectional view taken along the line A-A of FIG. 8a showing the formwork line assembly type beam joint structure of the CFT column, and 9b is the formwork line assembly of the CFT column It is an elevation view showing the type beam joint structure, and FIG. 10 is a plan view showing the formwork line assembly type beam joint structure of the CFT column.

As shown in FIGS. 8a, 8b and 9a, 9b, the bent portion 11a and the bent portion 11a, which are the ends of the bent steel sheet 11, are spaced apart from each other and face to face, and the spaced apart bent portion 11a ) The 'ㅗ'-shaped backing plate 12 is added to the inner side to strengthen the bending stress corresponding to the external bending force, while the welded metal is completely penetrated and welded, so that the stress loss of the steel pipe column 10 due to fatigue or damage at the welding site is designed to prevent it. Although not separately shown in the drawings, the CFT column 1 is formed by pouring concrete inside the steel pipe column 10 . 8a and 8b show the bent portion 11a in which the end of the bent steel plate 11 is bent and the vertical portion 12b of the bent portion 11a spaced apart between the bent portion 11a, the vertical portion 12b of the 'ㅗ'-shaped backing plate 12. ) is inserted and welded, but in order to further reinforce the bending stress, the '+' shaped back plate 12 or ‡' shaped back plate 12 described above is applied.

In addition, in order to connect the CFT column (1) and the formwork line assembly type beam (2), on one side and the opposite side of the CFT column (1), the CFT column (1) A side plate panel 20 for accommodating the concrete to be poured into the joint portion of the formwork line assembly type beam 2 is installed, and the side plate panel 20 is composed of a bottom part 21 and a side part 22 . As in the formwork prefabricated beam (2), the main reinforcing bars or strip reinforcing bars are pre-reinforced at the factory and transported to the site, so the side panel panel 20 also requires the required rebars to be pre-arranged at the factory, thereby reducing the working time according to the reinforcing bars at the work site. It can be shortened, and the arrangement of the main reinforcing bars or the strip reinforcing bars in the formwork prefabricated beam is not specifically shown in the drawings, but may be installed in various forms that are generally practiced.

And the bracket 50 connecting the side part 22 of the side plate panel 20 and the CFT column 1 with an oblique line is fixed by welding to firmly fix the side plate panel 20, and at the same time, these brackets 50 are used for pouring concrete. There is an effect that can prevent the phenomenon that the side plate panel 20 sags down by the concrete being poured without installing a starter bar.

On the lower surface of the bottom part 21 of the side plate panel 20, a support panel 30 formed integrally with the bottom part 21 is installed. The support panel 30 is installed around the steel pipe column 10 and has a function corresponding to the punching shear force generated around the steel pipe column 10 . The punching shear force generated in the CFT column (1) is generated not only at the joint of the CFT column (1) and the formwork prefabricated beam (2) but also around the joint between the CFT column (1) and the floor slab. ) is formed around the whole while having a certain distance from the CFT column (1).

In addition, by forming the protrusions 31 that protrude from both ends of the side plate panel 20 in the direction in which the support panel 30 is joined as described above, the CFT column 1 and the formwork line assembly type beam 2 are connected and joined together. While seating the formwork prefabricated beam 2 on the protrusion 31 of the supporting panel 30, one end of the side plate panel 20 and one end of the formwork prefabricated beam 2 are buttted to each other and subsequently joined. It is possible to construct quickly and precisely without

And the support panel 30 is in surface contact with the lower surface of the bottom part 21 of the side plate panel 20 and is integrally constituted by welding, etc., so as to prevent the side plate panel 20 from sagging during concrete pouring. , the bottom part 21 of the side plate panel 20 together with the support panel 30 increases the stress corresponding to the punching shear force together.

In addition, a reinforcing rib 40 joined to the lower surface of the CFT column 1 and the support panel 30 is installed to share and support the load applied from the upper portion of the support panel 30 with the CFT column 1, the reinforcement As the rib 40, a generally widely applied reinforcing rib 40 may be applied.

11 is a cross-sectional view of a state in which the CFT column and the CFT column are connected in the present invention. At the end of each CFT column 1 to be connected to each other, the connecting portion 72 of the connecting plate 70 is attached to the inner surface of the steel pipe column 10. After being seated in close contact, the steel pipe column 10 and the connecting portion 72 are integrally fastened with the screw portion S that has passed through the screw portion passing hole H, and then each connection plate coupled to the CFT column 10 is combined. After attaching the flange portions 71 of (70) to face each other, the CFT column (1) and the CFT column (1) are integrally fastened with the fastening portion (B) to combine the CFT column (1) and the CFT column (1) will connect In addition, between the connection portion 72 and the flange portion 71 of the connection plate 70, in order to prevent buckling due to bending force generated at the portion where the CFT column 1 and the CFT column 1 are connected, a rib-type support portion (73) is integrally formed by welding.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the terms or words used in the present specification and claims should not be construed as being limited to conventional or dictionary meanings, and the technical spirit of the present invention It must be interpreted with a corresponding meaning and concept. Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only an embodiment of the present invention, and do not represent all the technical spirit of the present invention, so within the limit without departing from the scope of the present invention, various It should be understood that there may be equivalents and variations.

1: CFT column 2: Formwork prefabricated beam
10: Steel pipe machine, etc. 11: Bending steel sheet
11a: bent part 12: back plate
13: stud 14: reinforcing bar
20: side panel panel 21: bottom part
22: side part 30: support panel
31: protrusion 40: reinforcing rib
50: Bracket 60: Fireproof coating
61: wire mesh 70: connection plate
71: flange 72: connection part
73: support a: space
B: fastening part H: threaded part through hole
S: thread

Claims (8)

The end of the bent steel plate 11 and the end of the bent steel plate 11 are spaced apart from each other and face to face, and joined to the space (a) formed by the back plate 12 padded on the spaced part by full penetration of the weld metal. CFT column (1) which is integrally formed by pouring concrete inside the steel pipe column (10);
On one side and the opposite side of the CFT column (1), it continuously connects with the formwork prefabricated beam (2), and the floor portion that accommodates the concrete poured into the joint of the CFT column (1) and the formwork prefabricated beam (2) (21) and a side plate panel (20) consisting of a side portion (22);
A support having formed protrusions 31 protruding from both ends of the side plate panel 20 so as to be integrally formed by surface contact with the lower surface of the bottom portion 21 of the side plate panel 20 and to support the formwork assembly type beam 2 . panel 30;
A CFT column formwork assembly type beam joint structure, characterized in that it consists of a reinforcing rib (40) joined to the lower surface of the CFT column (1) and the support panel (30) to support the support panel (30).
The method according to claim 1,
Each end of the bent steel plate 11 has a vertical cross section, and the back plate 12 that is padded on the spaced part is formed as a horizontal plate, and the studs 13 are installed at regular intervals in the inner direction of the back plate 12. CFT column formwork line assembly type beam joint structure.
The method according to claim 1,
Each end of the bent steel plate 11 has a bent portion 11a vertically bent inward, and the back plate 12 padded to the spaced portion is in a 'ㅗ' shape so that it is fitted in close contact between the bent portions 11a. , or is formed in a '+' shape, and the welded metal can be completely penetrated between the upper end of the vertical part 12b of the fitted 'ㅗ' or '+'-shaped top plate 12 and the both bent parts 11a. Formwork line assembly type beam joint structure of CFT column, characterized in that the space (a) is formed.
The method according to claim 1,
A wire mesh (61) is installed on the outer peripheral surface of the CFT column (1) and a mortar is poured to form a fire resistant coating (60).
The method according to claim 1,
A formwork line assembly type beam joint structure of a CFT column, characterized in that a bracket (50) connecting the side part (22) of the side plate panel (20) and the CFT column (1) in an oblique line is provided.
The method according to claim 1,
Formwork prefabricated beam joint structure of CFT column, characterized in that the reinforcing bars 14 are integrally connected by welding at regular intervals between the back plate 12 and the back plate 12.
The method according to claim 1,
Each end of the bent steel plate 11 has a bent portion 11a vertically bent inward, and the back plate 12 padded on the spaced apart portion is in a '‡' shape to fit closely between the bent portions 11a. CFT column, characterized in that the space (a) through which the welded metal can be completely penetrated is formed between the upper end of the vertical part 12b and the both bent parts 11a of the fitted '‡'-shaped backing plate 12 Formwork line assembly type beam joint structure.
The method according to claim 1,
For the CFT column (1) and the CFT column (1), at the end of each CFT column (1) to be connected, the connecting portion 72 of the connecting plate 70 is seated in close contact with the inner surface of the steel pipe column 10. After that, the steel pipe column 10 and the connection part 72 are integrally fastened with the threaded part S that has passed through the threaded part passing hole H, and then each of the connection plates 70 coupled with the CFT column 10 is CFT column formwork assembly type beam joint structure, characterized in that the CFT column (1) and the CFT column (1) are integrally fastened with the fastening portion (B) after the flange portions (71) are brought into close contact with each other.

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