KR20090105512A - Concrete Filled Steel Tube - Google Patents

Abstract

PURPOSE: A connection structure of a steel cast and a beam is provided to correct a deviated welding surface by loosening the bolts fastening reinforcement plates and the beam, thereby improving welding accuracy. CONSTITUTION: A connection structure of a steel cast and a beam comprises upper and lower reinforcement plates(40,44) which are welded to the outside surface of a steel column(10) of upper and lower flanges(31,32) on the end of a beam(30). The upper reinforcement plate has a cutout groove so that the upper reinforcement plate is fitted in the vertical web of the beam and placed beneath the upper flange, corresponding to a diaphragm(20). The upper and lower reinforcement plates and the upper and lower flanges are connected by bolts, respectively.

Description

Construction Structure of Steel Formwork and Beams {Concrete Filled Steel Tube}

The present invention is to connect the beam to the concrete filled steel tube (CFT: Concrete Filled Steel Tube), and more specifically, the reinforcing plate to the upper and lower flanges of the beam connected to the steel pipe column by assembling the bolt fastening method and in the field When welding the reinforcement plate and the steel pipe pillar, when welding the vertical web of the steel sheet pillar and the beam by bolts, the welding surface of the reinforcement plate and the steel pipe pillar is aligned in line and fixed with bolts and then welded to increase the welding precision. And it relates to the connecting structure between the steel sheet formwork and the beam that the shear force and the bending moment received from the diaphragm inside the column is reinforced in the reinforcement plate to withstand the transverse buckling and seismic of the beam.

Concrete Filled Steel Tube (CFT), which is a steel sheet formwork, is a concrete filled steel pipe column of existing steel frame, which has excellent seismic performance and rigidity, and also has the advantages of reducing fireproof coating and excellent fire resistance. The fourth structure following Group S (Steel Frame), RC Group and SRC Group has recently been in the spotlight, and the building structure has been adopted by this method 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. The basement is usually cast from the top with hoppers and concrete buckets, and the ground-floor column is casted back from the bottom of the column with pump pipes or from the top with a tram tube.

Conventional iron sheet formwork fabricated four square steel plate pillars forming one side of the column to produce a steel pipe column with a square cross-section. In the process of welding four steel plates, the diaphragm for beam connection of the building was built to reinforce the connection between beams and columns.

In the formwork, beams and columns transfer all the loads at the joint, so the formwork steel pipe can be locally destroyed by the force acting on the beam, or the joint can be broken early due to the stress concentration that causes local deformation of the steel pipe. For this reason, it is essential to make proper reinforcement to ensure that the joints of the columns and beams have sufficient rigidity and strength. The joint reinforcement of concrete filled steel pipe columns and beams can be divided into shear reinforcement and moment reinforcement.

Conventionally, a steel plate addition reinforcement method for increasing the thickness by applying an iron plate on the outer surface of a column for shear reinforcement and a stud bolt joint reinforcement method for joining a stud bolt to the inner surface of a concrete filled steel pipe column have been adopted. However, the method of reinforcing steel plate is less economical due to the demand of steel plate with considerable thickness, and the method of reinforcing the stud bolt joint reinforces the shear force of the beam to the inside of the concrete filled steel pipe because the reinforcement range of the stud bolt is limited to the inner side of the steel pipe. There was no problem.

In addition, the diaphragm method of inserting a beam connecting diaphragm to the joint part by moment reinforcement has been adopted. Conventional diaphragm method can be divided into the inner diaphragm method, the outer diaphragm method and the through-type diaphragm method according to the insertion position of the diaphragm. However, because the diaphragm must be installed in the middle of the pillar, there was a problem in that the middle portion was cut partially.

Japanese Patent Laid-Open No. 1-290844 discloses a column-beam connection structure in which a cross-shaped diaphragm having concrete filling holes and holes for reinforcing steel bars is directly connected to upper and lower gussets of steel golbo beams. In the above, a structure in which a diaphragm in which a sleeve is inserted is welded to a steel pipe has been disclosed. In Japanese Patent Laid-Open No. 62-072841, a sleeve is embedded in an inner center of a steel pipe at a site where a column and a beam are joined, and a stiffener is inserted between the steel pipe and the sleeve. The structure has been disclosed, and Japanese Patent Laid-Open No. 6-294159 discloses a structure in which a tubular member is embedded in the inside of a steel pipe column surface or a concrete filled steel pipe column surface welded and bonded to a bogie sheet. No. 288001 discloses a structure in which vertical ribs and diaphragms are welded to the inside of a concrete-filled steel pipe column welded to a bogie sheet. -346039 discloses a column-beam connection structure in which a vertical stiffener is attached to an inner surface of a steel pipe at a concrete-filled steel pipe column-SRC beam connection, and Japanese Patent Laid-Open No. 5-156710 discloses a square or circular steel pipe column-beam connection. A joint structure has been disclosed in which a vertical stiffener is attached to the inner side of JP-A-6-306942. An outer diaphragm is welded between a bogie sheet and a steel pipe column, and reinforced with a vertical stiffener on the inner surface of the steel pipe at the site. The structure has been disclosed.

However, they are also difficult to manufacture because of the method of shear reinforcement or diaphragm welding with one side of the column open, and the problem of falling verticality due to the bending deformation of the steel plate because of the method of transverse welding of the column. There was.

The present invention has been developed in view of the conventional problems, and an object of the present invention is to weld each of the iron plates bent in the form of "c" to each other but weld each diaphragm to the portion corresponding to the upper flange of the beam to each bending iron plate Then, when these two bent iron plates are welded to each other and the two sides are welded, the half inner diaphragms are made to correspond to each other so that a single steel pipe column is manufactured, thereby providing a steel pipe column with reduced welding points, wherein a bolt is provided on the upper side of the beam. The reinforcing plate is fastened to the steel pipe pillar in contact with the bisected diaphragms to connect the bisected diaphragms to reinforce the shear force and bending moment received from the diaphragm and to withstand the transverse buckling and seismic resistance of the beam. In particular, when the welding surface of the reinforcement plate and the steel pipe column is distorted, loosen the bolts, and then align the welding surface and finally weld the reinforcement plate and the column surface to provide the connection structure of the steel plate formwork and the beam, which improves the welding precision. have.

According to an embodiment of the present invention, a diaphragm is welded to each beam connection portion inside a concrete-filled steel pipe column, and upper and lower flanges of upper and lower flanges are formed on the upper and lower reinforcing plates directly welded to the outer circumferential surface of the steel pipe column. The plate is inserted into the vertical web of the beam to be placed under the upper flange to form a cutting groove so as to correspond to the diaphragm, the upper reinforcing plate and the upper flange of the beam is fastened by bolts, the lower reinforcing plate is the lower portion of the beam The bolt is fastened under the flange, and when the upper and lower reinforcing plate of the beam is welded to the outer circumferential surface of the steel pipe pillar, the tightening force of the bolt is adjusted to increase the welding precision by matching the welding surface and complement the beam tension.

Since the reinforcement plate of the present invention is assembled to the upper and lower flanges of the beam by the bolt fastening method, when the welding surface is twisted when welding with the steel pipe pillar in the field, the bolts can be adjusted in a straight line after the bolts are loosely adjusted. Therefore, welding precision can be improved. And since the diaphragm is welded to the inside of the steel pipe column and does not protrude to the outside of the steel pipe column, it is not necessary to form a separate outlet for the steel pipe column, and it is not necessary to separately weld the auxiliary horizontal beam for connecting the beam to the steel pipe column. Since it is possible to carry more steel pipe pillars is reduced, there is an effect that the logistics cost is reduced.

In addition, the steel pipe pillar has only the two sides facing each other by bending the steel plate in a "c" shape, so that the welding location is reduced and the productivity is improved.The reinforcement plate of the beam is a diaphragm structure that connects the diaphragm of the divided steel pipe pillar. It is also effective in that shear reinforcement and moment reinforcement are securely performed.

1 is an exploded perspective view of a steel pipe pillar and a beam of an embodiment of the present invention, Figure 2 is an assembled plan sectional view of the beam of an embodiment of the present invention. The present invention prepares two bending iron plate 11 bent to the iron plate "c" and then welds a plurality of diaphragms 20 for each beam connection portion inside each of the bending iron plate (11). These diaphragms 20 are installed for each portion where the upper flange 31 of the beam 30 is directly welded to the steel pipe pillar surface, and one diaphragm is bisected, and these bent iron plates 11 have a right angle maintenance and reinforcement. To this end, a plurality of right angle retaining bars 13 are welded in a V shape.

When the two bent iron plates 11 are welded to each other and the two sides of the welding surface 12 facing each other is produced as a single steel pipe pillar (10). At this time, the diaphragms bisected with each other are completed with one diaphragm 20 while the opposing surfaces are in contact with each other, and these diaphragms are formed with a pouring hole 21 for pouring the upper part or reverse pouring the lower part.

Beam 30 is provided with upper and lower reinforcing plates (40, 44) for direct welding with the outer surface of the steel pipe column (10). The reinforcing plates 40 and 44 are bolted to the upper and lower flanges 31 and 32 of the beam 30, the upper reinforcing plate 40 is fitted to the vertical web 33 of the beam 30. An incision groove 41 is formed to be placed under the upper flange 31 and a rectangular bolt hole 42 for fastening the bolt 50 and the nut 51 is formed, and the bolt hole 34 is also formed in the upper flange 31. The upper reinforcing plate 40 and the upper flange 31 is fastened with bolts 50, and the welding faces 35 and 43 for welding the steel pipe pillars 10 to their ends are chamfered. As the upper reinforcing plate 40 is placed under the upper flange 31, it is not necessary to install a separate back bar under the upper flange 31 during welding.

In addition, the lower flange 32 has bolt holes 34 and 46 formed therein in order to fasten the lower reinforcing plate 44 to the bolt 50 at the bottom thereof, and a welding surface for welding to the steel pipe column 10 surface ( 35,45) are formed in the form of chamfers. Reference numeral 14 denotes a gusset for welding the outer circumferential surface of the steel pipe column 10 to fasten the vertical web 33 of the beam 30 with a bolt.

The connection structure of the pillar and the beam of the embodiment of the present invention configured as described above does not need to process a separate outlet on the pillar 10 because the diaphragm 20 is welded inside the steel pipe pillar 10 so as to improve productivity. do. Since the steel pipe pillar 10 is bi-directionally manufactured in a bent form, only two places of welding are required to face each other, thereby reducing the welding location and improving productivity of the steel pipe pillar.

As shown in FIGS. 2 and 3, the upper and lower reinforcing plates 40 and 44 of the beam 30 correspond to the internal diaphragm 20 while crossing the welding surface 12 facing each other of the steel pipe pillar 10. Are welded in position. In the welding process, the vertical webs 33 of the beams 30 are fastened to the gussets 13 of the steel pipe columns 10 by bolts to connect the beams and the columns. At this time, if the fastening force of the upper and lower reinforcing plates 40 and 44 fastened to the upper and lower flanges 31 and 32 of the beam 30 is loosely adjusted, the weld surfaces 43 and 45 of these reinforcing plates are steel pipe columns 10. Contact with the outer surface of the) to improve the precision of the weld (60), and finally tighten the bolts to secure the reinforcement plate and the flange, and then these reinforcement plate (40, 44) and the steel pipe column (10) Welding complements the connection between beams and columns.

Therefore, even if the diaphragm 20 welded into the steel pipe pillar 10 is bisected, the upper reinforcing plate 40 of the beam is welded to the outer surface of the steel pipe pillar 10 to connect these divided diaphragms. Complementary, the upper and lower reinforcing plate (40, 44) is connected to the upper and lower flanges (31, 32) of the beam (30) through the bolts and welds 60, the beam and the column is structurally stable.

4 is a side cross-sectional view of the assembly of the steel pipe pillar and the beam of another embodiment of the present invention, except that the upper reinforcing plate 40 on the upper surface to the upper flange 31 of the beam 30 and fastened with bolts. It has the same configuration as the embodiment. Since only the upper reinforcing plate 40 is fixed to the upper flange, it is necessary to attach a separate back bar 47 to the bottom of the upper flange 31 to prevent the welding contents fall during the welding process.

Figure 5 shows a beam connection structure of another embodiment of the present invention, the beam TSC beam 70 of another embodiment of the present invention.

The TSC beam 70 is a composite beam welded from the bottom by bending the iron plate, the steel pipe pillar 10 is formed with a seat 15 and a pedestal 16 for fixing the TSC beam 70, The upper reinforcing plate 71 is fastened to the upper portion of the TSC beam 70 by a bolt 72.

In another embodiment of the present invention configured as described above, the process of manufacturing the steel pipe pillar 10 by welding the divided diaphragm 20 inside the pair of bent iron plates 11 is the same as the embodiment of the present invention. There is a difference in that only the upper reinforcing plate 71 is fastened to the upper portion of the TSC beam 70 by the bolt 72, the TSC beam 70 is formed on the outer circumferential surface of the steel pipe column 10 and the pedestal Put on (16) and fasten with bolts and then weld the upper reinforcement plate (71) to the column to finally connect the beam and the column. In this case, since a plurality of reinforcing bars 73 for connecting the reinforcing bars 74 are formed in the upper reinforcing plate 71, the reinforcing bars 74 may be connected to the reinforcing plates to supplement the tensile force.

1 is an exploded perspective view of the steel pipe pillar and beam of one embodiment of the present invention

Figure 2 is a cross-sectional view of the assembly of the steel pipe column and beam of one embodiment of the present invention

Figure 3 is an assembled side cross-sectional view of the steel pipe pillar and beam of one embodiment of the present invention

Figure 4 is a side cross-sectional view of the assembly of the steel pipe column and beam of another embodiment of the present invention

5 is an assembled cross-sectional view of the steel pipe pillar and beam of another embodiment of the present invention

<Code Description of Main Parts of Drawing>

10: steel pipe pillar 11: bending iron plate

20: diaphragm 30: beam

31,32: upper and lower flange 33: web:

40 Upper Reinforcement Plate 41: Incision Groove

42: bolt hole 43: welding surface

44: lower reinforcing plate 45: welding surface

46: bolt hole 50: bolt

Claims (3)

Weld the diaphragm that does not protrude to the outside of each beam connection portion inside the concrete-filled steel pipe column, and the upper and lower flanges of the upper and lower flanges of the upper and lower reinforcing plates directly welded to the outer circumferential surface of the steel pipe column, The upper reinforcing plate is inserted into the vertical web of the beam to be placed under the upper flange to form a cutting groove to correspond to the diaphragm, the upper reinforcing plate and the upper flange of the beam is fastened by bolts, The lower reinforcing plate is fastened with a bolt under the lower flange of the beam, Before welding the upper and lower stiffening plate of the beam to the outer peripheral surface of the steel pipe pillar, the welding surface is matched, and then the steel plate formwork to fix the welding plate and flange with the bolt to increase the welding precision and complement the beam tension Connection structure of the beam. The method of claim 1, Rectangle bolt holes are formed in the upper and lower reinforcing plates, and bolt holes are formed in the upper and lower flanges of the beam corresponding thereto, and the bolts are fastened by bolts, and the upper and lower reinforcing plates are welded to the steel pipe column. The connecting structure of the iron formwork and the beam, characterized in that the welding surface of the upper and lower reinforcement plate and the steel tube column surface to be matched by using a rectangular bolt hole while adjusting the tightening force of the. The method of claim 2, The steel pipe column is a welded two sides facing each other facing each other a pair of bending iron plate folded in the form of the letter "c", The diaphragms are first welded to each of the bent iron plates in a divided state, The upper reinforcing plate is welded to the steel pipe pillar surface so as to face each of the divided diaphragms to connect the nutrient plate diaphragm and the connection structure of the steel sheet formwork and beam.

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