KR101254983B1 - Joint structure of concrete filled tube and beam - Google Patents

Abstract

PURPOSE: A Joint structure of concrete filled pipe and beam is provided to stably join concrete filled steel pipe and beam by effectively resisting to a load which is caused by a beam and the yield strength rise of a beam joint by using an inner steel pipe. CONSTITUTION: A Joint structure of concrete filled pipe and beam comprises an outer circumference steel pipe(110), an inner steel pipe(120), and connecting members(130a,130b). The outer circumference steel pipe is filled with concrete and is joined with a beam(140) on the outer surface. The inner steel pipe is arranged inside the outer circumference steel pipe and is partially filled with the concrete. A connecting member connects the outer circumference steel pipe and inner steel pipe for integrating.

Description

Joint structure of concrete filled tube and beam

The present invention relates to a joint structure of a concrete filled steel pipe and a beam, and more particularly, to a joint structure of a concrete filled steel pipe and a beam that is easy to fill and manufacture concrete.

Concrete Filled Steel Tube (CFT) is concrete filled inside steel pipe of existing steel frame, and it has excellent seismic performance and rigidity, and it has the advantages of reducing fireproof coating and excellent fire resistance. Steel frame), RC, and SRC, the fourth structure has been in the spotlight recently, and the building structure by this method is adopted in Japan, China, and Korea.

Since the filling of concrete is important, high flowable concrete is used, and the concrete needs to be filled without voids in the column.

When the concrete filled steel pipe is used as a pillar, the cheolgolbo is bonded to the large diameter concrete filled steel pipe.

Here, since all loads are transmitted to the joint of the cheolgolbo and the column, the steel pipe is locally destroyed by the force acting on the cheolgolbo, or it is difficult to transfer the load because the joint is broken early due to the stress concentration causing local deformation of the steel pipe.

For this reason, there are various conventional techniques for reinforcing the joints of the pillars and cheolgolbo to have sufficient rigidity and strength.

For example, the stud bolt method shown in (a) of Figure 1 is provided with a stud bolt 20 on the inner surface of the concrete filled steel pipe column 10 to reinforce the connection with the concrete. However, the stud bolt method requires not only too much stud bolt 20 but also the reinforcement range of the stud bolt 20 is limited to the inner side of the steel pipe to which the stud bolt 20 is bonded, the cheolgolbo 30 There is a problem that the shear force of the concrete filled steel pipe column 10 is not sufficiently transmitted.

On the other hand, the diaphragm method shown in Figure 1 (b) reinforces the joint by inserting the diaphragm 25 in the junction with the reinforcement beams 30 in the concrete filled steel pipe column (10). However, the diaphragm method is difficult to insert the diaphragm 25 when using a cold-formed steel pipe is complicated in construction.

In addition, the method of inserting the cheolgolbo shown in (c) of Figure 1 to dig a groove in the concrete filled steel pipe 10 to insert the cheolgolbo 30 into the steel pipe 10 to reinforce the joint. However, the method of inserting cheolgolbo is difficult to weld and construction, and the difficulty of quality control occurs as the concrete is tightly filled.

The present invention has been made to solve at least some of the problems of the prior art, as one aspect, to more effectively resist the increase in the strength of the beam joint and the load from the beam to stabilize the joint behavior of the concrete filled steel pipe and beam It is an object to provide a joint structure of concrete filled steel pipes and beams.

In addition, an object of the present invention is to provide a joint structure of the concrete filled steel pipe and the beam that can effectively resist the shear load of the outer peripheral steel pipe.

In addition, as an aspect of the present invention, it is an object of the present invention to provide a bonded structure of the concrete filled steel pipe and the beam that can prevent the concrete is not filled tightly and the strength of the concrete filled steel pipe is reduced.

In addition, as an aspect of the present invention, an object of the present invention is to provide a bonded structure of a concrete filled steel pipe and beam having good resistance to long-term behavior of concrete.

As one aspect for achieving at least some of the above object, the present invention is filled with concrete therein, the outer peripheral steel pipe is bonded to the outer surface; An inner steel pipe inserted into the outer circumferential steel pipe and embedded in the concrete filled in the outer circumferential steel pipe, and a portion of the concrete filled in the outer circumferential steel pipe filled therein; And an outer circumferential steel pipe and an inner steel pipe connected to each other on an inner surface of the outer circumferential steel pipe corresponding to a portion to which the beam is joined in the outer circumferential steel pipe, so that the outer circumferential steel pipe and the inner steel pipe with respect to a load acting on the beam. It provides a connection structure of the concrete-filled steel pipe and the beam comprising a; connection member to integrate the resistance behavior.

Preferably, the inner steel pipe may be disposed in parallel with the outer peripheral steel pipe.

As another aspect, the inner steel pipe may be configured in plurality in a one-to-one correspondence to the plurality of beams joined to the outer peripheral steel pipe.

In another aspect, a plurality of the connecting member may be bonded to the inner steel pipe.

Also preferably, when the beam is composed of H-beam or I-beam, the connecting member may be joined at positions corresponding to upper and lower flanges of the beam, respectively, on the inner surface of the outer peripheral steel pipe.

More preferably, the thickness of the connecting member may be composed of more than the thickness of the flange of the beam.

Also preferably, the inner steel pipe is composed of a plurality of diaphragms for connecting the plurality of inner steel pipes; may further include.

Also preferably, the inner steel pipe may be configured to be longer than the height of the corresponding beam, or may be of the same length as the outer peripheral steel pipe.

Also preferably, the connecting member may be composed of a plate perpendicular to the shear load acting on the outer peripheral steel pipe.

On the other hand, the outer peripheral steel pipe and the inner steel pipe may be configured in a circular or square.

Also preferably, a plurality of through holes may be formed on a side surface of the inner steel pipe, and the inner steel pipe may be strongly synthesized with concrete filled in and out of the inner steel pipe.

According to one embodiment of the present invention having such a configuration, by using the internal steel pipe can effectively resist the increase in the strength of the beam joint portion and the load from the beam to achieve the effect of stabilizing the joint behavior of the concrete filled steel pipe and beam have.

In addition, according to an embodiment of the present invention, it is possible to obtain the effect of using the connecting member formed in the diaphragm to resist the shear load of the outer circumferential steel pipe to the internal concrete pressure.

In addition, according to an embodiment of the present invention, by using the internal steel pipe that can resist the compressive force with acupressure, it is possible to obtain the effect of preventing the concrete strength of the concrete filled steel pipe is not lowered tightly filled. .

In addition, according to one embodiment of the present invention, it is possible to obtain a good effect of resistance to long-term behavior of concrete.

1 is a side view showing a conventional joining structure for joining the concrete filled steel pipe and the beam.
Figure 2 is a perspective view showing the bonding structure of the concrete filled steel pipe and the beam according to an embodiment of the present invention.
3 and 4 are a side view and a plan view showing a bonded structure of the concrete filled steel pipe and the beam according to an embodiment of the present invention shown in FIG.
5 to 9 are plan and side views showing other embodiments of the present invention.
Figure 10 is a side view showing the joining structure of the concrete filled steel pipe and the beam including a through-hole, a pin joint plate and a joining auxiliary member according to another embodiment of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Furthermore, the singular forms "a", "an," and "the" include plural referents unless the context clearly dictates otherwise.

In this specification, terms such as " comprise ", " comprise ", and " have "mean that there exist features, numbers, steps, operations, elements, parts, And should not be construed to preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, referring to Figures 2 to 4 looks at the junction structure of the concrete filled steel pipe and the beam according to an embodiment of the present invention. 2 is a perspective view showing a bonding structure according to an embodiment of the present invention, Figure 3 is a side view, Figure 4 is a plan view.

As shown in Figure 2 to 4, in the joining structure of the concrete filled steel pipe and the beam 140 according to an embodiment of the present invention, the outer circumferential steel pipe 110 and outer circumferential steel pipe 110 is directly bonded to the beam 140 It is configured to include a connecting member 130 for connecting the inner steel pipe 120 and the outer peripheral steel pipe 110 and the inner steel pipe 120 disposed in the.

Here, in the bonding structure of the concrete filled steel pipe and the beam 140 according to the embodiments of the present invention to be described later, but the case of the beam 140 is H-shaped steel, but the beam 140 that can be applied to the present invention is It is not limited, and may take various forms, such as I-beam, C-beam, and T-beam.

The outer periphery steel pipe 110 is filled with concrete to ensure seismic performance and rigidity, and corresponds to the concrete filled steel pipe that can be used as a pillar of the building. In addition, the outer surface of the outer peripheral steel pipe 110, the beam 140 may be pin-bonded or moment bonded.

On the other hand, the inner steel pipe 120 may be composed of a concrete filled steel pipe disposed in the outer peripheral steel pipe 110, in one embodiment may be disposed in parallel with the outer peripheral steel pipe (110). In the interior of the inner steel pipe 120, concrete may be poured at the time of concrete casting for the outer peripheral steel pipe (110).

When the concrete is filled in the outer circumferential steel pipe 110, as a result, the inner steel pipe 120 may be buried in the concrete is surrounded by the inner and outer concrete.

In addition, the concrete filled in the outer circumferential steel pipe 110 and the concrete filled in the inner steel pipe 120 may be strongly combined with each other through the openings at both ends of the inner steel pipe (120).

In addition, in the bonding structure of the concrete filled steel pipe and the beam 140 according to an embodiment of the present invention, the inner steel pipe 120 may be provided corresponding to the beam 140 bonded to the outer peripheral steel pipe 110 and corresponding It may be configured to be longer than the height of the beam 140. In addition, although not shown, the inner steel pipe 120 may be of the same length as the outer peripheral steel pipe (110).

The connecting member 130 connects the outer circumferential steel pipe 110 and the inner steel pipe 120 to integrate the behavior of the outer circumferential steel pipe 110 and the inner steel pipe 120. In other words, the connection member 130 is bonded to one end to the inner surface of the outer peripheral steel pipe 110 and the other end to the outer surface of the inner steel pipe 120, the inner steel pipe 120 receives the force received by the outer peripheral steel pipe 110. ) Can be delivered.

In one embodiment, the connection member 130 may be configured as a plate surrounding a portion of the outer circumference of the inner steel pipe (120). Here, the bonding area between the connecting member 130 and the inner steel pipe 120 may be sufficiently secured to sufficiently transfer the force between the connecting member 130 and the inner steel pipe 120, and in one embodiment, the connecting member 130. It may be configured to surround more than half of the outer circumference of the inner steel pipe 120 formed in a circular shape.

In addition, the connecting member 130 may be vertically bonded to both the outer peripheral steel pipe 110 and the inner steel pipe 120, the welding method may be used as a joining method, but is not limited thereto.

And, in the case where the beam 140 is composed of H-shaped steel or I-shaped steel, the connecting member 130 is each of the upper flange 144a and the lower flange 144b of the beam 140 on the inner side of the outer peripheral steel pipe 110 Bonded to a position corresponding to may be provided symmetrically on the top and bottom of the inner steel pipe (120).

On the other hand, when the beam 140 is not H-shaped steel or I-shaped steel, the connecting member 130 has a tensile force and a compressive force acting on the joint portion of the beam 140 and the outer peripheral steel pipe 110 due to the load is the internal steel pipe ( It may be provided corresponding to the cross-sectional shape of the beam 140 to be transmitted to the 120.

In addition, the thickness of the connecting member 130 may be a flange of the corresponding beam 140 so that the resistance of the inner steel pipe 120 to the force acting on the beam 140 by the load can be sufficiently transmitted to the outer peripheral steel pipe 110. 144) or more.

And, the connecting member 130 is composed of a plate perpendicular to the shear load acting on the outer peripheral steel pipe 110, acting on the outer peripheral steel pipe 110 by using the pressure of the concrete is filled in the lower portion of the connecting member 130. It can resist shear load.

To this end, in the joining structure of the concrete filled steel pipe and the beam 140 according to an embodiment of the present invention, the portion where the connecting member 130 and the outer peripheral steel pipe 110 is bonded as shown in Figure 4 the flange 144 It may be formed equal to or wider than the width of). In addition, a portion where the connection member 130 is joined to the inner steel pipe 120 may be configured to a sufficient area.

In addition, the inner steel pipe 120 and the connecting member 130 may be configured to ensure a sufficient joint portion.

Referring to FIG. 3, when a load acts directly on and below the beam 140 in the joining structure of the concrete filled steel pipe and the beam 140 according to an embodiment of the present invention, the upper flange 144a and the outer circumferential steel pipe 110. At the junction of the outer circumferential steel pipe 110 from the outer side of the steel tube 110, the tensile force acts, while the lower flange 144b and the outer circumferential steel pipe 110 at the junction of the compressive force from the beam 140 to the outer circumferential steel pipe 110 direction. This works.

At this time, the upper connecting member (130a) transmits a tensile force to the inner steel pipe 120, and the portion extending from the inner steel pipe 120 to the upper portion of the upper connecting member (130a) with the outer peripheral steel pipe (110) opposed thereto. Due to the pressure of the concrete filled in between can resist in the opposite direction to the tensile force.

On the other hand, the lower connecting member (130b) transmits the compressive force to the inner steel pipe 120, the opposite portion of the lower connecting member (130b) in the inner steel pipe (120) due to the pressure of the concrete filled around the outer peripheral steel pipe It can resist in the opposite direction against the compressive force acting in the direction from the 110 to the inner steel pipe (120).

In addition, as described above, the upper and lower connection members 130b can resist the shear load acting on the outer circumferential steel pipe 110 by the acupressure of the concrete filled in the lower portion of the upper and lower connection members 130b. .

Through this, the bonding structure of the concrete filled steel pipe and the beam 140 according to an embodiment of the present invention to prevent deformation of the outer peripheral steel pipe 110 by using the inner steel pipe 120 to which the load of the beam 140 is transmitted. It is possible to prevent the exit of the beam 140 by the tensile force.

In addition, when the concrete is not tightly filled in the portion where the outer circumferential steel pipe 110 and the beam 140 is bonded, since the outer circumferential steel pipe 110 must withstand the compressive force without the help of concrete pressure, the strength of the outer circumferential steel pipe 110 Deterioration may occur, in the joint structure of the concrete filled steel pipe and the beam 140 according to an embodiment of the present invention, since the inner steel pipe 120 can be resisted by receiving the compressive force, the strength of the outer peripheral steel pipe 110 is The fall can be prevented.

Next, other embodiments of the present invention will be described with reference to FIGS. 5 to 9. 5 to 9 have only differences in the shape of the junction structure and components, so there will be no significant difference in function and behavior, so it will be described together. 5 and 8 (a) and (b) respectively show a plan view and a side view of the illustrated embodiment, and FIGS. 6, 7 and 9 respectively show a plan view of the illustrated embodiment.

In another embodiment illustrated in FIG. 5, a plurality of connection members 130 may be bonded to the inner steel pipe 120. For example, the inner steel pipe 120 may be disposed in the inner center of the outer peripheral steel pipe 110, may be provided with a plurality of connecting members 130 to be symmetric in all directions, each connecting member 130 is an outer peripheral steel pipe It may be bonded to the inner side of the (110). Here, the plurality of beams 140 may be bonded to the outer circumferential steel pipe 110 to correspond to each of the connecting members 130 that are joined in all directions.

In the bonded structure of the concrete filled steel pipe and the beam 140 according to another embodiment of the present invention, the concrete is filled in the outer peripheral steel pipe 110 to the resistance of the inner steel pipe 120 to resist the load of the beam 140. In addition to the acupressure of the plurality of connection members 130 may be added to the strength.

On the other hand, unlike the present embodiment, one beam 140 is joined to the outer peripheral steel pipe 110, it is also possible to configure the joint of the beam 140 to reinforce the inner steel pipe 120 and a plurality of connecting members 130. .

6 and 7, the inner steel pipe 120 may be configured in plural in one-to-one correspondence with the plurality of beams 140 joined to the outer circumferential steel pipe 110. At this time, the connection member 130 for connecting the inner steel pipe 120 and the outer peripheral steel pipe 110 may be provided according to the number of the inner steel pipe (120). Here, since the inner steel pipe 120 and the connecting member 130 is substantially the same as the inner steel pipe 120 and the connecting member 130 described above with reference to Figures 2 to 4 will not be described.

In addition, referring to another embodiment illustrated in FIG. 8, the diaphragm 150 connecting the plurality of inner steel pipes 120 may be connected to the concrete filled steel pipe and the beam 140 according to another embodiment of the present invention. May be further included.

The diaphragm 150 may be bonded to the plurality of inner steel pipes 120, and may be provided at upper and lower portions of the inner steel pipe 120 in correspondence with the connection member 130.

In the bonding structure of the concrete filled steel pipe and the beam 140 according to another embodiment of the present invention, the tensile force due to the load applied to the beam 140 is bonded to one side of the outer peripheral steel pipe 110 is the upper connection member ( 130a) can be transmitted to one inner steel pipe 120, the upper diaphragm 150a and the other inner steel pipe 120, the compressive force from the lower connecting member 130b, one inner steel pipe 120, the lower diaphragm 150b and It may be delivered to another inner steel pipe (120).

As such, the diaphragm 150 may integrate the behavior of the plurality of inner steel pipes 120 and the outer circumferential steel pipe 110, and the plurality of inner steel pipes 120 having integrated behavior share the resistance to the aforementioned tensile and compressive forces. can do.

On the other hand, in another embodiment shown in Figure 9, the outer peripheral steel pipe 110 is circular, the inner steel pipe 120 may be configured in a square. As such, in the bonding structure of the concrete filled steel pipe and the beam 140 according to another embodiment of the present invention, the outer peripheral steel pipe 110 and the inner steel pipe 120 may be configured in a circular or square.

Finally, with reference to Figure 10 by the embodiment of the present invention, the connection structure of the concrete filled steel pipe and the beam 140, including the through-hole 125, the pin joint plate 160 and the joining auxiliary member 170 Take a look at

As shown in FIG. 10, the junction structure of the concrete filled steel pipe and the beam 140 according to another embodiment of the present invention includes a through hole 125 and an outer peripheral steel pipe 110 and a beam formed in the inner steel pipe 120. Joining support member 170 for assisting the bonding of the pin 140 and the pin 140 for the pin bonding of the 140 may be further included.

At least one through-hole 125 may be formed on a side surface of the inner steel pipe 120, and the concrete filled in and out of the inner steel pipe 120 and the inner steel pipe 120 may be formed from each other through the through-hole 125. Can be synthesized. Through this, the combination of the concrete and the inner steel pipe 120 inside the outer peripheral steel pipe 110 may be more robust. The through hole 125 is also applicable to the embodiment shown in FIGS. 2 to 9.

In addition, the pin bonding plate 160 is bent to the letter 'b' is configured to be coupled to the coupling bolt 165 to the web 142 and the outer peripheral steel pipe 110 of the beam 140, the beam 140 and It can support the pin joint of the outer peripheral steel pipe (110).

And, the joining auxiliary member 170 is bent to the 'b' and is provided at the bottom of the joint portion 140 of the outer steel pipe 110, the lower flange 144b of the beam 140 to be bonded to the outer steel pipe 110 It can be configured to support.

While the invention has been shown and described with respect to particular embodiments, it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as set forth in the claims below. I want to make it clear.

110: outer peripheral steel pipe 120: internal steel pipe
125: through hole 130: connecting member
140: beam 150: diaphragm
160: pin bonding plate 170: bonding auxiliary member

Claims (11)

Concrete is filled inside, the outer peripheral steel pipe is bonded to the outer surface;
An inner steel pipe inserted into the outer circumferential steel pipe and embedded in the concrete filled in the outer circumferential steel pipe, and a portion of the concrete filled in the outer circumferential steel pipe filled therein; And
The outer peripheral steel pipe and the inner steel pipe is installed on the inner surface of the outer peripheral steel pipe corresponding to the portion in which the beam is joined in the outer peripheral steel pipe to connect with each other, the resistance of the outer peripheral steel pipe and the inner steel pipe to the load acting on the beam A connection member integrating behavior;
Joining structure of concrete filled steel pipe and beam, including.
The method of claim 1,
The inner steel pipe,
Joining structure of the concrete filled steel pipe and the beam, characterized in that arranged in parallel with the outer peripheral steel pipe.
The method of claim 1,
The inner steel pipe,
Joining structure of the concrete filled steel pipe and the beam, characterized in that composed of a plurality of one to one corresponding to the plurality of beams joined to the outer peripheral steel pipe.
The method of claim 1,
Joining structure of the concrete filled steel pipe and the beam, characterized in that a plurality of the connecting member is bonded to the inner steel pipe.
The method of claim 1,
When the beam is composed of H-beam or I-beam,
The connecting member is a joining structure of the concrete filled steel pipe and the beam, characterized in that joined to the position corresponding to the upper and lower flanges of the beam on the inner surface of the outer peripheral steel pipe.
The method of claim 5,
The connection member of the concrete filled steel pipe and the beam, characterized in that the thickness of the connecting member is composed of more than the thickness of the flange of the beam.
The method of claim 1,
The inner steel pipe is composed of a plurality,
And a diaphragm connecting the plurality of inner steel pipes.
The method according to claim 6,
The inner steel pipe,
Joining structure of the concrete filled steel pipe and the beam, characterized in that configured to be longer than the height of the corresponding beam.
The method of claim 1,
The connecting member is a joint structure of the concrete filled steel pipe and the beam, characterized in that consisting of a plate perpendicular to the shear load acting on the outer peripheral steel pipe.
10. The method according to any one of claims 1 to 9,
Joining structure of the concrete filled steel pipe and the beam, characterized in that the outer peripheral steel pipe and the inner steel pipe is composed of a circular or square.
10. The method according to any one of claims 1 to 9,
A plurality of through holes are formed on the side of the inner steel pipe,
The inner steel pipe is a joint structure of the concrete filled steel pipe and the beam, characterized in that the steel composite and the steel filled inside and outside the inner steel pipe.

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