KR101734107B1 - Cft column structure with the diaphragm and the manufacturing method thereof - Google Patents

Abstract

The present invention relates to a CFT column structure to construct a composite column by pouring concrete in a rectangular steel column whose cross section is closed. The CFT column structure has a diaphragm installed in a position of joining at least an upper flange of a steel beam in a longitudinal direction of a column structure. The diaphragm has a C-shaped three-faced diaphragm and a straight one-faced diaphragm integrated by welding. The one-faced diaphragm has a larger width than the three-faced diaphragm. A front plate and a pair of side plates individually manufactured are attached to an outer end of the three-faced diaphragm. A rear plate having a horizontal slit is attached to an outer end of the one-faced diaphragm.

Description

TECHNICAL FIELD The present invention relates to a box-shaped CFT column structure having a diaphragm for joining a steel beam,

The present invention relates to a CFT column structure for constructing a composite column by pouring concrete into a square steel column having a closed section, more specifically, a diaphragm is built in the column structure, Lt; RTI ID = 0.0 > CFT column < / RTI >

CFT (Concrete Filled Steel Tube) structure is a structure that can take the advantages of steel frame and concrete by filling the closed inner space of steel pipe with concrete.

The CFT structure prevents the general phenomenon that the concrete is abruptly broken due to a large compressive force by restricting the concrete inside the steel pipe forming the shell, thereby increasing the strength of the concrete. On the other hand, The buckling strength of the member is reinforced to increase the strength of the members. As a result, the size of the cross section can be reduced to improve the economical efficiency and to maximize the utilization space of the building.

In addition, the CFT structure improves other functions as a structural material such as durability and vibration resistance, and its usage has been greatly increased in recent years.

In this case, when the CFT steel pipe is used as a column, there is a structural advantage that the column itself can support a very large axial force. However, when the steel pipe is joined to a steel member such as a steel beam, the CFT steel pipe There is a problem that a thin outer shell (steel plate) is torn to cause local breakage or, in severe cases, the joint is broken prematurely.

Therefore, in order to prevent local damage of the steel pipe constituting the shell of the CFT column, it is common to use a reinforcing means such as a diaphragm to correspond to the flexural load by the beam member.

Such a diaphragm is largely provided by an inner diaphragm type inserted into the inside of a steel pipe, an outer diaphragm type provided in a rim shape on the outer surface of the steel pipe, and a through diaphragm type penetrating the steel pipe and provided therein. The inner diaphragm system does not cause problems such as steel cutting and welding work in the field where the workability is deteriorated in the outer diaphragm etc., and it is the most preferable reinforcing system because the appearance is simple and clean.

In order to install the diaphragm inside the closed end face of the steel pipe, a method is generally used in which a steel pipe is cut to install a diaphragm, and then the cut steel pipe is welded again. However, such a manufacturing method not only has the possibility of causing an error in the weighted critical vertical degree in the column member, but also has a limitation on the application of the column having a large cross section because the standard of the manufactured steel pipe is limited.

Therefore, in recent years, various examples have been researched and presented on a method of installing a diaphragm therein without cutting a concrete filled steel column, and examples thereof are disclosed in Published Unexamined Patent Application No. 10-2009-0105512 There is an invention entitled " a connection structure between a steel plate form and a beam ".

As shown in FIG. 1, the connecting structure of the prior art described above is constructed such that the steel plates 11 bent in a " C " shape are welded to each other, The inner half diaphragm 20 is welded to the inner half of the diaphragm 20 and then welded on both sides of the bending steel plates 11 so that one half of the inner half diaphragm 20 corresponds to each other, will be.

In the above-mentioned prior art, since the steel pipe column is not cut, the welding spot can be reduced compared with the conventional inner diaphragm, and the quality of the column can be improved because there is no need to reassemble the column.

However, although the diaphragm is integrally formed so that the stress can be uniformly distributed on all the cross sections, in the above-mentioned conventional art, the two inner diaphragms are separated from each other on the mutually facing surfaces (arc portions) It is not clear and this is a factor that prevents the diaphragm from fully exhibiting its structural function.

KR 10-2009-105512 A

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and it is an object of the present invention to provide a diaphragm which can be installed during a process of assembling the column structure without horizontally cutting the column structure, Box type CFT column with diaphragm for steel beam joining which can be applied in general, irrespective of the required cross-sectional size, can be made clear, and vertical stiffener can be installed inside to minimize the cross- And a method for manufacturing the same.

According to a preferred embodiment of the present invention to solve the above problems, a diaphragm is provided at a position where at least an upper flange of a steel beam is joined in a longitudinal direction of the column structure, Wherein the diaphragm and the one-sided diaphragm are integrally welded, wherein the one-sided diaphragm is of a greater width than the three-sided diaphragm, and each of the outer ends of the tri- There is provided a box-shaped CFT column structure with a diaphragm incorporated therein, characterized in that a front plate and a pair of side plates are attached to each other, and a rear plate having horizontal slits is attached to an outer end of the one-sided diaphragm .

At this time, a plurality of vertical reinforcing bars formed of a plurality of flat steel pieces and a vertical steel reinforcing bars in the longitudinal direction may be installed in parallel on inner surfaces of the front plate, the side plate, and the rear plate. In this case, The vertical reinforcing bars installed on the front plate and the side plate are located on the inner side of the three-sided diaphragm and inserted into the plurality of vertical reinforcing bars provided with the three-sided diaphragms in parallel, Regarding the installation of the face diaphragm, the vertical reinforcement of the vertical reinforcement installed on the back plate is located inside the cross-section of the one-sided diaphragm.

According to another embodiment of the present invention, there is provided a method of manufacturing an electronic device, comprising the steps of: a) preparing a front plate, a rear plate and a pair of side plates, b) laying the front plate on a working bed, C) welding the side plates to both sides of the three-sided diaphragm with the front plate attached, d) attaching the front plate and the side plate to each other, E) attaching the back plate to the one-sided diaphragm constituting the integral diaphragm; and e) attaching the back plate to the one-sided diaphragm constituting the integral diaphragm. The present invention also provides a method of manufacturing a box-shaped CFT column structure having a diaphragm for joining steel beams.

Since the column structure of the present invention is not horizontally cut, it is unnecessary to examine the vertical degree at the time of manufacture, and the outer surface is clean and has a beautiful appearance, and the built-in diaphragm is structurally integrated, .

Also, the column structure of the present invention can be easily installed with the vertical stiffener, thereby minimizing the cross-section of the synthetic column, thereby maximizing the space utilization rate.

In addition, when the column structure of the present invention is manufactured in a prefabricated form and has versatility that can be applied regardless of the size of the cross section of the column, the triple-sided diaphragm can maintain the angle with respect to each side plate in the manufacturing process, It is possible to have a rectangular cross-section, and it has high preparation.

1 is a cross-sectional view of a conventional CFT column structure.
2 is a partially cutaway perspective view and a cross-sectional view illustrating a column structure according to an embodiment of the present invention.
3 is a plan view of a diaphragm embedded in the column structure of the present invention.
Fig. 4 is a perspective view showing one embodiment of each shell plate constituting the column structure of the present invention. Fig.
FIGS. 5 to 8 are perspective views showing steps of fabricating the column structure of the present invention.

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

2 is a partially cutaway perspective view and a cross-sectional view illustrating a column structure according to an embodiment of the present invention. FIG. 3 is a cross-sectional view of the column structure shown in FIG. Fig. 4 is a perspective view showing an embodiment of each outer plate (a front plate, a side plate, and a rear plate to be described later) to be a shell of a composite column.

2, the column structure 100 of the present invention has a box-like shape having a rectangular cross-section in which the diaphragm 110 is embedded. The column structure 100 includes a diaphragm 110, And a pair of side plates 122 and a rear plate 123 welded to the outer ends of the front plate 121 and the rear plate 123, respectively.

The diaphragm 110 is formed by integrally welding a three-sided diaphragm 111 and a one-sided diaphragm 112 formed of a central portion 111a and two side portions 111b.

The diaphragm 110 is installed at a position where at least the upper flange 210 of the steel beam 200 is joined in the longitudinal direction of the column structure 100. That is, the diaphragm 110 may be installed only on the upper flange 210 of the steel beam 200, and may be formed not only on the upper flange 210 of the steel beam 200 but also on the lower flange 210 220 may be located together.

Shaped diaphragm 110 adhered to each inner surface of the columnar structure 100 in a structurally integrated state is formed in the columnar structure 100 through the upper flange 210 of the steel beam 200, ) Is dispersed on each end surface of the column structure 100 and the stress transfer is made clear so that a secure moment connection can be established between the column and the beam. On the other hand, the column structure 100 The shape of the cross section of the box formed by the front plate 121, the side plates 122 and the back plate 123 can be maintained by itself during the manufacturing process, thereby improving the preparation.

As shown in FIG. 3, the diaphragm 110 integrated into a square shape is formed by welding a single-sided single-sided diaphragm 112 at both ends of the side portions 111b of the three-sided diaphragm 111, The width d 1 of the one-sided diaphragm 112 may be greater than the width d 2 of the three-sided diaphragm 111.

As described above, the one-sided diaphragm 112 having a width larger than that of the three-sided diaphragm 111 allows the outer end to form a rib insertion groove 112a into which a vertical rib 130 described later can be inserted.

The front plate 121, the side plate 122 and the rear plate 123 of the outer plate 120 having the shape of the box section are made of individual steel plates and the side ends of both side plates 122 are connected to the front plate 121 And the inner surface of the rear plate 123.

At this time, it is preferable that both side edges of the front plate 121 and the rear plate 123 protrude slightly from the outer surface of the side plate 122 so that the columnar structure 100 has a cross- Welding between the side plates 122 and between the back plate 123 and the side plates 122 is not only facilitated but also required to be attached at the final stage during the manufacturing process of the column structure 100 Thereby facilitating the joining of the rear plate 123.

The front plate 121 and the pair of side plates 122 are attached to the respective outer ends of the three-sided diaphragm 111. More specifically, the front plate 121 is attached to the outer end of the central portion 111a of the three-sided diaphragm 111, the side plate 122 is attached to each of the side portions 111b on both sides of the central portion 111a, (123) is attached to the outer end of the one-sided diaphragm (112).

The triangular diaphragm 111 is welded on each inner surface of the front plate 121 and the side plate 122 while the one surface diaphragm 112 is welded on the outer surface of the back plate 123, And is integrated with the rear plate 123. To this end, the rear plate 123 is provided with a horizontal slit 123a at a position where the outer end of the one-sided diaphragm 112 contacts.

As shown in FIG. 4, a vertical reinforcing bar 130 may be further provided on inner surfaces of the front plate 121, the side plate 122, and the rear plate 123.

The vertical reinforcing bar 130 provided inside the column structure 100 maximizes the space utilization rate so as to minimize the column section by further increasing the rigidity of the composite column constructed by placing the concrete.

The vertical reinforcing bars 130 may be variously configured, but most preferably, the vertical reinforcing bars 130 are vertically arranged on the inner surface of the outer sheathing 120, And a plurality of vertical reinforcing bars 132 arranged in a manner to connect the end portions of the outer plates 120 to each other.

The flat steel pieces 131 perpendicular to the inner surfaces of the outer plates 120 and particularly the inner surfaces of the front plate 121 and the side plates 122 allow the vertical reinforcing bars 132 to be disposed and the front plates 121 and the side plates 122 Facilitates the installation of the three-sided diaphragm 111 relative to the other.

For example, the spaces between the flat plates 131 perpendicular to the inner surface of the outer plate 120 provide a passage across a plurality of vertical reinforcing bars 130 arranged in parallel while contacting the inner surface of the outer plate 120 , The triple-sided diaphragm 111 is inserted into the passage so that the entire length of each outer end of the three-sided diaphragm 111 can be brought into contact with the inner surfaces of the front plate 121 and the side plates 122 .

The vertical reinforcement 132 of the vertical reinforcement 130 installed on the front plate 121 and the side plate 122 in the present embodiment is located at the inner end of the triple-sided diaphragm 111, The diaphragm 110 is inserted into a plurality of vertical reinforcing bars 130 installed in parallel with each other. This not only simplifies the installation process of the diaphragm 110 but also ensures excellent performance of the diaphragm 110 .

A plurality of vertical reinforcing bars 130 including flat bars 131 and vertical bars 132 are provided in parallel to the rear plate 123 in the same manner as the front plate 121 or the side plates 122, 123 are assembled after welding the one-sided diaphragm 112 to the three-sided diaphragm 111 by welding.

Therefore, the diaphragm 112 can not be inserted into the vertical bar 130, unlike the diaphragm 111, and the diaphragm 112, which is in contact with the back plate 123, And a vertical reinforcing bar 130 installed on the back plate 123 is inserted into the reinforcing bar insertion groove 112a.

The vertical reinforcing bars 132 of the vertical reinforcing bars 130 installed on the rear plate 123 are formed in the end face of the one side diaphragm 112 .

Up to now, the structure of the column structure 100 according to the present invention has been described. Next, a method of manufacturing the column structure 100 will be described.

5 to 8 illustrate a method of manufacturing the column structure 100 according to the respective steps, wherein a) preparing each outer plate 120, b) attaching a three-sided diaphragm to the front plate 121, (C) attaching a side plate to the three-sided diaphragm (111), d) forming an integral diaphragm (110), and e) And installing the plate (123). The following is a detailed description of each step.

a) preparing each shell plate (120);

The front plate 121 and the rear plate 123 and the pair of side plates 122 constituting the outer shell 120 of the column structure 100 are prepared.

As described above, each of the outer shells 120 is made of a separate steel sheet and is integrally formed with each other in connection with the installation of the three-sided diaphragm 111 or the one-sided diaphragm 112 according to the subsequent steps. Thereby forming a box-like columnar structure 100 having a rectangular cross-sectional space closed by welding. Of course, the rear plate 123 should be provided with a horizontal slit 123a for welding with the one-sided diaphragm 112 in the future.

On the other hand, when vertical stiffener 130 is installed on column structure 100, a plurality of vertical portions 130 are formed on the inner surfaces of front plate 121, rear plate 123 and side plate 122 in this step, The reinforcing bar 130 can be installed in advance. At this time, the vertical bar 130 includes a plurality of flat bars 131 and one vertical bar 132. In this step, however, only the flat bar 131 is installed, and the vertical bars 132 are provided on the front plate 121, The diaphragm 111 may be installed before the three-sided diaphragm 111 is installed.

At this time, a C-shaped three-sided diaphragm 111 and a one-sided diaphragm 112 should be prepared together with the outer shell 120, and the outer end of the one-sided diaphragm 112 is provided with a vertical A reinforcing bar insertion groove 112a into which the reinforcing bar 130 can be inserted may be further provided.

b) In the front plate 121  3 sides The diaphragm (111)  Installing step (Fig. 5);

The front plate 121 is laid down on a workbad (not shown) so that the inner surface of the front plate 121 faces upward, and a triple-sided diaphragm 111 is vertically disposed on the front surface of the front plate 121, And a triple-sided diaphragm 111 is installed on the front plate 121 through a process of welding to the inner surface of the plate 121.

The central portion 111a of the three-sided diaphragm 111 is welded to the front plate 121 so that the side portions 111b formed on both sides of the central portion 111a are self- So that the side plates 122 can be installed on both sides of the front plate 121 while maintaining the box shape at an accurate angle.

In the case where the vertical plate 130 is installed on the front plate 121, the three-sided diaphragm 111 is inserted into the plurality of vertical reinforcing bars 130 installed in parallel, And the three-sided diaphragm 111 is installed on the front plate 121 by welding them to each other.

c) three sides On the diaphragm (111) Shroud  Installing step (Fig. 6);

The side plates 122 are welded to both side portions 111b of the three-sided diaphragm 111 with the front plate 121 attached thereto. At this time, the side ends of the respective side plates 122 are welded to both inner surfaces of the front plate 121

The inner surface of the side plate 122 is welded to the outer end of the side portion 111b of the triangular diaphragm 111. When the vertical reinforcing bar 130 is provided on the inner surface of the side plate 122, The side plate 122 is positioned so that the side portion 111b of the diaphragm 111 is inserted into the vertical barrel 130 and then the outer end of the side portion 111b is welded to the inner surface of the side plate 122 .

d) Integral The diaphragm (110)  (Fig. 7);

The one-sided diaphragm 112 is welded to connect the ends of the side portions 111b of the three-sided diaphragm 111 with the front plate 121 and the side plate 122 to each other, .

As a result, the diaphragm 110 positioned on the inner surface of the columnar structure 100 has a shape corresponding to each surface of the columnar structure 100, and has a structural integrity, To the surface.

e) One side On the diaphragm 112 The rear plate 123  Installing step (Fig. 8);

The step of assembling the column structure 100 is completed by attaching the back plate 123 to the single-sided diaphragm 112 constituting the integrated diaphragm 110 as described above.

In the case where the vertical plate 130 is provided on the rear plate 123 and the reinforcing bar insertion groove 112a is provided at the outer end of the one-sided diaphragm 112, the vertical bar 130 is inserted into the reinforcing bar insertion groove 112a The rear plate 123 is brought into close contact with the outer end of the one-sided diaphragm 112 and welded therebetween.

The attachment of the back plate 123 to the one-sided diaphragm 112 is achieved by welding the horizontal slit 123a provided on the back plate 123. [ That is, the outer end of the one-sided diaphragm 112 is exposed to the outside through the horizontal slit 123a and the outer end of the exposed one-sided diaphragm 112 is welded to the inner surface of the horizontal slit 123a So that the one-side diaphragm 112 and the rear plate 123 are integrated. Of course, the other side edge of each side plate 122 is also welded to both side surfaces of the back plate 123.

 Thus, a box-shaped CFT column structure having a diaphragm for steel beam joining according to the present invention is completed.

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

100; Column structure 110; Diaphragm
111; Three-sided diaphragm 111a; Central part
111b; Side 112; One side diaphragm
112a; A reinforcing bar insertion groove 120; skin
121; Front plate 122; Side plate
123; A back plate 123a; Horizontal slit
130; Vertical bar 131; Flatiron
132; Vertical rebar 200; Steel beam
210; An upper flange 220; Bottom flange

Claims (6)

A column structure for constructing a steel-concrete composite column by filling concrete therein,
A diaphragm 110 is installed at a position where at least the upper flange 210 of the steel beam 200 is joined in the longitudinal direction of the column structure 100. The diaphragm 110 has a three- The single-sided diaphragm (112) and the single-sided diaphragm (112) are integrated by welding. The single-sided diaphragm (112)
The front face plate 121 and the pair of side face plates 122 are separately attached to the respective outer ends of the three-sided diaphragm 111. The outer face of the one-sided diaphragm 112 is horizontally A rear plate 123 provided with a slit 123a is attached,
A plurality of vertical reinforcing bars 130 formed of a plurality of flat steel pieces 131 and one vertical reinforcing bars 132 in the longitudinal direction are formed on the inner surfaces of the front plate 121, the side plates 122 and the rear plate 123, The dogs are installed in parallel,
The vertical reinforcement 132 of the vertical reinforcement 130 installed on the front plate 121 and the side plate 122 is located on the inner side of the three-sided diaphragm 111 and includes a plurality of vertical reinforcing bars 130 And a diaphragm (111) is inserted in the inside of the box-shaped CFT column structure. delete delete The diaphragm according to claim 1, wherein the vertical reinforcing bar (132) of the vertical bar (130) installed in the rear plate (123) is located inside the end face of the one- Built-in boxed CFT column structure. A method of manufacturing a column structure for filling concrete with a steel-concrete composite column, the method comprising:
a) preparing a front plate (121), a rear plate (123) and a pair of side plates (122);
b) The central portion 111a of the triple-sided diaphragm 111 is placed on the front plate 121 so that the triple-sided diaphragm 111 is perpendicular to the front plate 121, (121);
c) welding the side plates 122 to both side portions 111b of the three-sided diaphragm 111 to which the front plate 121 is attached;
d) The one-sided diaphragm 112 is welded to connect the ends of the side portions 111b of the three-sided diaphragm 111 with the front plate 121 and the side plate 122, );
e) attaching the back plate 123 to the one-sided diaphragm 112 constituting the integral diaphragm 110; Wherein the step of joining the steel beam and the step of joining the steel beam to each other is performed by using the joining method. 6. The method of claim 5,
Each of the inner surfaces of the front plate 121, the rear plate 123 and the side plate 122 prepared in the step a) is provided with a plurality of vertical flat bars 131 and one vertical bar 132 A plurality of reinforcing bars 130 are installed in parallel,
The three-sided diaphragm 111 is installed on the front plate 121 in the step b) by inserting the three-sided diaphragm 111 into the plurality of vertical reinforcing bars 130 installed in parallel, 111a are welded to the inner surface of the front plate 121,
The side plate 122 is installed in the step c) by inserting the side plate 122 so that the side portion 111b of the triple-sided diaphragm 111 is inserted into the vertical reinforcement 130 provided on the side plate 122 And the side portion (111b) is welded to the inner surface of the side plate (122). A method of manufacturing a box-shaped CFT column structure with a diaphragm incorporated therein.

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