KR101222034B1 - Concrete-filled steel tube - Google Patents

Abstract

The present invention relates to a filled steel pipe, hollow steel pipe; An inner compartment reinforcing means provided to divide the interior of the steel pipe into a plurality of closed end spaces, thereby improving structural performance of the steel pipe; And a filler filled in the inside of the steel pipe, wherein the internal compartment reinforcing means is fastened to cooperate with each other while being joined to the steel pipe, thereby providing the closed end space in the inside of the steel pipe, and the multiple fillers are It comprises a plurality of unit reinforcing members to reinforce the resistance to the load via the closed end space, the unit reinforcing members including a bent or curved portion is coupled to each other, providing a central space in the center of the steel pipe And providing a plurality of outer space portions between the central space portion and the steel pipe, wherein the plurality of fillings are configured to resist load through the central space portion and the outer space portion, and harden by filling a filling in the closed space. It improves the structural performance of filled steel pipes such as resistance to shear load, rigidity and fire resistance.

Description

Filled Steel Pipes {CONCRETE-FILLED STEEL TUBE}

The present invention relates to a filled steel pipe, and more particularly, a plurality of unit reinforcing members having a plurality of holes are fastened to cooperate with each other while being joined to the steel pipe, and a plurality of closed end spaces are provided inside the steel pipe. The present invention relates to a filled steel pipe which improves the structural performance of a steel pipe by filling a space with a filling material.

Figure 1a is a perspective view schematically showing a filled steel pipe used for a large column, Figure 1b is a cross-sectional view of the filled steel pipe filled with concrete.

In general, the concrete-filled steel pipe exhibits sufficient synthetic behavior when the concrete 130 is filled inside the steel pipe body 110 without a separate shear connector. However, in the case of the concrete-filled steel pipe 100 forming a CFT mega column used in a high-rise building, the length of one side of the cross section is 1M or more, so the size of the concrete-filled steel pipe 100 is very large and the steel pipe body 110 and Synthesis between the concrete 130 has a problem that the concrete 130 filled in the steel pipe body 110 is separated from the steel pipe body 110 by sliding.

In order to solve this problem, conventionally, a plurality of studs 120 as shear connectors are installed on the inner surface of the steel pipe body 110 as illustrated in FIGS. 1A and 1B. Here, the stud 120 is a member in which the head and the body are integrally formed, and thus, the stud 120 can be easily attached to a steel plate or a steel pipe by welding at a construction site or a factory, and thus is widely used as a shear connector.

However, because the stud 120 is generally not large in size, when used as a shear connector of a large column, a plurality of studs 120 should be welded inside the steel pipe body 110.

As such, as the plurality of studs 120 are welded to the inner surface of the steel pipe body 110, there is a problem in that workability increases due to a large number of welding operations when constructing a large column. In addition, this causes a problem that the construction period is long and the construction cost increases.

In addition, even though many studs 120 are attached to the inner surface of the steel pipe body 110 is used as a shear connecting material, because the size of the stud 120 is very small compared to the size of the steel pipe body 110 used for large columns, concrete The studs 120 embedded in the 130 have a problem in that the resistance to the concrete 130 is small so that the concrete 130 may not be easily constrained.

In addition, in the event of a fire in the building, the steel pipe made of steel sheet is a high heat, the resistance to shear load is sharply lowered, there is a risk of collapse of the building.

Therefore, it is necessary to develop a shear connector having excellent construction ability, economic efficiency and stability as well as excellent resistance to shear load acting on the filled steel pipe.

The present invention has been proposed to solve the conventional problems as described above, the plurality of unit reinforcing members are joined to cooperate with each other while being joined to the steel pipe, a plurality of closed end spaces are provided inside the steel pipe, the concrete and Filling the same filling provides a filled steel pipe which improves the structural performance of the steel pipe.

In addition, the unit reinforcing member of the present invention is coupled to each other, providing a space portion to the center and the outer portion of the steel pipe, even if the resistance to the shear load of the fill-type steel pipe in the event of a fire in the building suddenly lowers, It provides a reinforcing steel pipe configured to reinforce the resistance capacity by the unit reinforcing member to form a space portion and the filler filled in the space portion.

In addition, the unit reinforcing member of the present invention, a plurality of holes are formed to improve the unity between the configuration of the filling of the filling and filling-type steel pipe, the edge of the hole is formed so that at least a portion of the curved in the hole To prevent cracking, to provide a filled steel pipe to improve the structural performance of the steel pipe.

Technical aspect in order to achieve the above object, the hollow steel pipe; An inner compartment reinforcing means provided to divide the interior of the steel pipe into a plurality of closed end spaces, thereby improving structural performance of the steel pipe; And a filler filled in the inside of the steel pipe, wherein the internal compartment reinforcing means is fastened to cooperate with each other while being joined to the steel pipe, thereby providing the closed end space in the inside of the steel pipe, and the multiple fillers are It comprises a plurality of unit reinforcing members to reinforce the resistance to the load via the closed end space, the unit reinforcing members including a bent or curved portion is coupled to each other, providing a central space in the center of the steel pipe And providing a plurality of outer spaces between the central space part and the steel pipe, so that the plurality of fillings are configured to resist load through the central space part and the outer space part.

In one embodiment, the plurality of unit reinforcing members are bolted to each other through a bolt, the bolt may be combined with the filler.

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Preferably, the unit reinforcing member, a plurality of holes are formed so as to increase the integrity of the filling, the edge of the hole is at least partially curved.

According to the filling type steel pipe according to the present invention, a plurality of unit reinforcing members are fastened to cooperate with each other while being joined to the steel pipe, a plurality of closed end spaces are provided in the interior of the steel pipe, and the filler such as concrete is filled in the closed end space. As a result, there is an advantage of improving the structural performance of the filled steel pipe by the interaction between the steel pipe, the unit reinforcing member and the filler.

In addition, the unit reinforcing member of the present invention is coupled to each other, providing a space portion to the center and the outer portion of the steel pipe, even if the resistance to the shear load of the fill-type steel pipe in the event of a fire in the building suddenly lowers, The unit reinforcing member to form a space portion and the filler to be filled in the space portion to reinforce the resistance, there is an effect of improving the stability of the building.

In addition, the unit reinforcing member of the present invention, a plurality of holes are formed to improve the unity between the configuration of the filling of the filling and filling-type steel pipe, the edge of the hole is formed so that at least a portion of the curved in the hole By preventing the crack, there is an effect of improving the structural performance of the filled steel pipe.

1A and 1B are a perspective view and a cross-sectional view schematically showing a large column in which a stud is used as the shear thermal binder according to the prior art
Figures 2a to 2c is a cross-sectional view and a perspective view showing an embodiment of a filled steel pipe according to the present invention and a perspective view showing a unit reinforcing member used therein
Figure 3a and 3b is a cross-sectional view and perspective view showing another embodiment of the filled steel pipe and unit reinforcing member according to the present invention
Figures 4a and 4b is a cross-sectional view and perspective view showing another embodiment of the filled steel pipe and unit reinforcing member according to the present invention

Hereinafter, the filled steel pipe according to the present invention according to the accompanying drawings will be described in detail.

Figure 2a is a cross-sectional view showing a cross section of the filled steel pipe 1 according to an embodiment of the present invention, Figure 2b is a perspective view showing a unit reinforcing member 25 used to partition the interior of the steel pipe 10, 2C is a perspective view showing the filled steel pipe 1 according to an embodiment of the present invention.

3A and 3B are cross-sectional and perspective views showing another embodiment of the filled steel pipe 1 and the unit reinforcing member 25 according to the present invention, and FIGS. 4A and 4B show another embodiment of the present invention. One cross section and a perspective view.

Filled steel pipe 1 according to the present invention, the hollow steel pipe 10, the internal compartment provided to improve the structural performance of the steel pipe 10 by partitioning the interior of the steel pipe 10 into a plurality of closed end spaces. Type reinforcement means 20 and the filling material 30 is filled in the interior of the steel pipe (10).

In general, the steel pipe 10 is made of a steel sheet, the steel sheet has a high thermal conductivity and a specific heat is small, heat transfer in the event of a fire, the load resistance capacity is sharply lowered. In order to overcome this, the heat resistance is low and the specific heat is high, thereby filling the filling 30, which slows heat transfer in the event of a fire, to enhance the fire resistance of the steel pipe 10 by reinforcing load resistance. In addition, the steel pipe 10 and the filler material 30 interact to improve rigidity.

Here, the shape of the steel pipe 10 may be a shape having a rectangular cross section, as shown in Figures 2a, 3a and 4a, in addition, various shapes such as a shape having a circular cross section is possible.

In addition, the filler 30 may be, for example, concrete, but is not limited thereto. Various materials may be used as long as the material may improve fire resistance, load resistance, and rigidity of the filled steel pipe 1. have.

However, in the case where only the filling 30 is simply filled into the hollow steel pipe 10 as described above, the properties of the steel pipe 10 and the filling material 30 are different from each other, so that the shear surface is in contact with the steel pipe 10 and the filling material 30. Phenomenon occurs. In order to overcome this problem, the prior art includes a stud on the inner surface of the rape, but there are problems as described above.

Thus, the present invention improves the structural performance of the filled steel pipe (1) by providing the internal compartmental reinforcement means (20) instead of the stud as a shear connector.

The internal compartment reinforcing means 20 of the present invention is provided to partition the interior of the steel pipe 10 into a plurality of closed end spaces. That is, referring to Figures 2a, 2c, 3a and 4a, the inner compartment reinforcing means 20 is provided in the steel pipe 10 in the longitudinal direction of the steel pipe 10 is provided to partition the inside of the steel pipe 10 cross section and , Filled 30 is filled in a plurality of closed end spaces.

The filling 30 filled in the plurality of closed end spaces is hardened and attached to the inner wall of the steel pipe 10 and one surface of the inner compartment reinforcing means 20. That is, the filling 30 is attached to the inner wall of the steel pipe 10 and one surface of the internal compartmental reinforcing means 20 in multiple. Accordingly, the contact surface of the filling 30 and the inner wall of the steel pipe 10 and the internal partition type reinforcing means 20 increases, thereby preventing the shearing phenomenon from occurring in the contact surface when the filled steel pipe 1 receives a shear load. . Thus, the resistance to shear load of the filled steel pipe 1 is improved.

Hereinafter, the internal compartment reinforcing means 20 will be described in more detail.

The internal compartmental reinforcement means 20 of the present invention is coupled to cooperate with each other while being joined to the steel pipe 10, to provide the closed end space in the interior of the steel pipe 10, multiple of the filler material 30 It includes a plurality of unit reinforcing members 25 to reinforce the resistance to the load via the closed end space.

In the prior art, since the stud, which is a shear connecting material, must be welded and joined to the inner wall of the steel pipe 10, the work is not easy and the working time is long.

However, the internal compartmental reinforcement means 20, which is a shear connecting member of the present invention, is coupled to a plurality of unit reinforcement members 25 by joining each other, and welds one end of the unit reinforcement member 25 to the inner wall of the steel pipe 10. By joining, installation is completed. That is, the internal compartment reinforcing means 20 according to the present invention has an advantage in that the installation work is easy, and the working time is shortened to reduce the cost.

At this time, the means for fastening the unit reinforcing member 25 may be made in a variety of ways, in the present invention is fastened using the bolt 50 and the nut (55).

In the present invention, as the stud functions as a shear connector and resists shear loads acting on the filled steel pipe 1, the stiffness of the filled steel pipe 1 is improved. In the present invention, the bolt 50 and the nut 55 Does this.

Specifically, the bolt 50 uses a through bolt without a head. In addition, the unit reinforcing member 25 is provided with a fastening hole 26 so that the bolt 50 is inserted into and coupled to each other. 2B to 4B, a plurality of fastening holes 26 are provided in the longitudinal direction of the steel pipe 10 near one side and the other side of the unit reinforcing member 25. In addition, since the unit reinforcing member 25 is formed in the same shape, the plurality of fastening holes 26 are matched with each other when combined with each other. That is, the unit reinforcing member 25 is brought into contact with each other so that the fastening holes 26 coincide with each other, and then the bolts 50 are inserted into the fastening holes 26 and the nuts 55 are fastened by fastening the nuts 55 at both sides thereof. The members 25 are coupled to each other.

Here, the bolt 50 is preferably formed long in the longitudinal direction. Specifically, the body of the bolt 50 is formed long, it is formed so that both ends of the bolt 50 when projecting from the unit reinforcing member 25. Therefore, both ends of the bolt 50 protruding from the unit reinforcing member 25 serves as a stud of the prior art. However, the shape of the bolt 50 is not limited to the above cases.

In detail, the unit reinforcing members 25 are fastened and coupled to each other by the bolts 50 as described above, such that the internal partition type reinforcing means 20 is formed. When the filling 30 is hardened by filling the plurality of closed end spaces partitioned by the internal compartmental reinforcing means 20, the bolt 50 serves as a stud. That is, when the filled steel pipe 1 receives a shear load, when the shear 30 is about to occur at the contact surface of the filling 30 and the inner wall of the steel pipe 10 and the inner partition type reinforcing means 20, the bolt 50 and The nut 55 acts to hinder this. This improves the resistance to shear load of the filled steel pipe 1.

In addition, at least one end of the plurality of unit reinforcing members 25 constituting the internal compartmental reinforcing means 20 is joined to the inner wall of the steel pipe 10. Even when the unit reinforcing member 25 is not bonded to the inner wall of the steel pipe 10 at all, the contact surface of the filling material 30 is formed in multiple to improve the resistance to the shear load of the filled steel pipe 1 to some extent. However, it is preferable to join one or more ends of the plurality of unit reinforcing members 25 to the inner wall of the steel pipe 10 to improve the integrity of the steel pipe 10, the filling 30, and the internal compartmental reinforcing means 20. Do.

2A to 4A, one end of each unit reinforcing member 25 is configured to be joined to the inner wall of the steel pipe 10. Accordingly, the internal compartmental reinforcement means 20 and the filler material 30 support the steel pipe 10, and the unity of the steel tube 10, the filler material 30, and the internal compartmental reinforcement means 20 is improved. The resistance to shear loads acting on the filled steel pipe 1 is improved.

Next, the unit reinforcing member 25 of the present invention, including the bent or curved portion is coupled to each other, the center space portion 40 and the center space portion of the bent or curved shape in the center of the steel pipe 10 A plurality of bent or curved outer spaces 45 are provided to the outside of the 40 so that the plurality of fillers 30 can be applied to the load through the central spaces 40 and the outer spaces 45. Configured to resist.
Here, the plurality of unit reinforcement members 25 form a closed end space in the center of the steel pipe 10 to make the steel pipe 10 as an external steel pipe as a whole, and a central space portion 40 in the center of the steel pipe 10. It is possible to form a double pipe structure of the plurality of unit reinforcing member 25 to be formed as an inner steel pipe.

The unit reinforcement member 25 illustrated in FIGS. 2B and 4B includes a bent portion, and the unit reinforcement member 25 illustrated in FIG. 3B includes a curved portion. The illustrated unit reinforcing member 25 is formed on one side shorter than the other side, but is not limited thereto.

According to the shape of the unit reinforcing member 25, the shape of the central space portion 40 formed by the inner compartment reinforcing means 20 is determined. That is, according to the shape of the unit reinforcing member 25 shown in FIG. 2B, the central space portion 40 has a rectangular shape as shown in FIG. 2A. Similarly, the central space portion 40 shown in FIG. 3A is circular, and the central space portion 40 shown in FIG. 4A is rhombic.

Depending on the shape of the central space portion 40 and the outer space portion 45, the resistance to the shear load of the filled steel pipe (1) may be slightly different, the manufacturing and coupling of the unit reinforcing member 25 There is a difference in ease. Therefore, the user may select the shape of the unit reinforcing member 25 as needed. In addition, the shape of the unit reinforcing member 25 shown in Figs. 2b to 4b can be various forms of course.

As shown in Figures 2a to 4a, the central space portion 40 and the outer space portion 45 is provided by the internal compartmental reinforcement means 20 of the present invention.

As described above, the central space portion 40 and the outer space portion 45 are provided inside the steel pipe 10. First, as described above, the center space portion 40 and the outer space portion 45, which are closed spaces, are provided to provide multiple resistance to shear loads.

And, in the event of a fire in the building, the steel pipe 10 made of steel sheet is rapidly reduced resistance to shear load due to the high heat, in the present invention the internal compartmental reinforcement means 20 and concrete to the steel pipe 10 Reinforce the resistance by supporting. In particular, the central space portion 40 is formed so as to be spaced apart from the wall of the steel pipe 10 and filled with the refractory filler in the outer space portion 45 therebetween, the heat transfer is late, so that the fire is less affected. That is, the internal compartmental reinforcement means 20 providing the central space portion 40 and the filler 30 filled in the central space portion 40 serve as separate filled steel pipes.

Therefore, the resistance to shear load of the filled steel pipe 1 is improved, so that the rigidity of the filled steel pipe 1 is increased, and the central space 40 is provided to improve the fire resistance of the filled steel pipe 1. .

Next, the unit reinforcing member 25 of the present invention, a plurality of holes 27 are formed so as to increase the integrity of the filling 30, the edge of the hole 27 so that at least a portion of the curvature Is formed.

As shown in FIGS. 2B to 4B, the unit reinforcing member 25 has a plurality of X-shaped holes 27 formed therein. In addition, the shape of the hole 27 is not limited to X letter, Various shapes are possible.

By forming the hole 27 as described above has the following effects. After the internal compartmental reinforcing means 20 is installed in the steel pipe 10, the filling material 30 such as concrete is filled. If the hole 27 is not formed in the unit reinforcing member 25, it is cumbersome because the work must be filled in the spaces 40 and 45 which are the closed spaces, respectively. In the present invention, however, the filling material 30 may move through the hole 27, and the filling material 30 is filled while being spread into the central space portion 40 and the plurality of outer space portions 45, so that the steel pipe ( 10) filling the filling 30 therein is easy to improve the filling properties.

In addition, when the filling 30 is filled in the steel pipe 10 and then hardened, the unity between the internal compartmental reinforcement means 20 and the concrete is improved by the hardened concrete passing through the hole 27. In addition, since the internal compartmental reinforcement means 20 is joined to the steel pipe 10, the integrity of the steel tube 10, the internal compartmentalized reinforcement means 20 and concrete is improved. That is, when the shear load acts on the filled steel pipe 1, the steel pipe 10, the internal compartmental reinforcing means 20 and concrete behave together to resist the shear load.

Thus, by providing a plurality of holes 27 in the unit reinforcing member 25 as described above, the unity between the filling of the filling material 30 into the steel pipe 10 and the configuration is improved, and thus the filled steel pipe 1 Resistance to shear load is improved.

However, the edge of the hole 27 is preferably formed so that at least a portion is curved. As such, forming a curved or curved portion of the edge of the hole 27 is to prevent the occurrence of cracking. That is, when there is a sharp or sharply formed portion of the edge of the hole 27, the crack is easily generated at the sharp or sharply formed portion of the edge of the hole 27 as the shear load acts on the filled steel pipe (1) This reduces the resistance to shear loads.

Therefore, it is preferable that sharp or sharp portions are not formed in the edge of the hole 27.

In summary, the fill-type steel pipe 1 according to the present invention, the plurality of unit reinforcing members 25 having a plurality of holes 27 are fastened to cooperate with each other while being joined to the steel pipe 10, the steel pipe 10 By providing a plurality of closed end spaces, in particular the central space portion 40 in the interior of the filling and filling the filling 30 in the closed end space, the resistance to shear load, rigidity and fire resistance of the filled steel pipe (1) It has the effect of improving the structural performance.

While the invention has been shown and described in connection with specific embodiments so far, it is to be understood that the invention can be variously modified and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

1 ... fillable steel pipe 10 ... steel pipe
20 ... internal compartment reinforcing means 25 ... unit reinforcing members
26 ... fastening hole 27 ... hole
30 ... Filling 40 ... Center Space
45 ... outer space 50 ... bolt
55 ... Nuts

Claims (4)

Hollow steel pipe 10;
An internal compartmental reinforcement means (20) provided to partition the interior of the steel pipe (10) into a plurality of closed end spaces to improve structural performance of the steel pipe (10); And
Includes; Filling 30 is filled in the steel pipe 10,
The internal compartment reinforcing means 20 is fastened to cooperate with each other while being joined to the steel pipe 10 to provide the closed space in the interior of the steel pipe 10, so that the plurality of the fillings 30 are the closed space. It is configured to include a plurality of unit reinforcing members 25 to reinforce the resistance to the load through the medium,
The unit reinforcement member 25 includes a bent or curved portion and is coupled to each other to provide a central space portion 40 at the center of the steel pipe 10, and the central space portion 40 and the steel pipe 10. Filled steel pipe is configured to provide a plurality of outer space (45) between), the plurality of the filling (30) is configured to resist the load through the center space portion 40 and the outer space (45).
The method of claim 1,
The plurality of unit reinforcing members 25 are bolted to each other through the bolt 50,
Filled steel pipe, characterized in that the bolt 50 is synthesized with the filling (30).
delete The method of claim 1,
The unit reinforcing member (25), a plurality of holes (27) are formed so as to increase the integrity of the filling, the fill-in steel pipe, characterized in that the edge of the hole (27) is at least partially curved.

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