KR20080099754A - Formed steel beam for steel-concrete composite beam and slab - Google Patents

Abstract

A molding steel sheet assembly beam is provided to make the adjustment of lateral surface height possible and to gain an excellent productivity since the molding steel sheet is manufactured in the factory. A molding steel sheet assembly beam comprises an abdominal steel sheet(110), a base part(121) welded into the down side of the abdominal steel sheet, a side perpendicular unit(122) curved upward from one-side end of backside, a support part(123) which is curve-cut on the top of the side perpendicular unit, a first lower shaping steel sheet(120) having the first center vertical part(124) curved upward from the other side end of base part, a second lower shaping steel sheet(130) welded into the lower part other side of the abdominal steel sheet, an upper surface portion(141) welded into the upper one side of the abdominal steel sheet, a first top molding steel sheet(140) having the second center vertical(142) which is bent downward from the one-side end of the upper surface portion, a second top molding steel sheet(150) welded into the top other side of the abdominal steel sheet.

Description

Formed steel beam for steel-concrete composite beam and slab}

1 is a perspective view of a molded steel sheet assembly beam according to a first embodiment of the present invention.

2 is a cross-sectional view of FIG. 1.

3 is a cross-sectional view of a composite beam-slab constructed using a molded steel sheet-assembled beam according to a first embodiment of the present invention.

4 and 5 are cross-sectional views of the molded steel sheet assembly beam according to the second embodiment of the present invention.

6 is a cross-sectional view of the molded steel sheet assembly beam according to the third embodiment of the present invention.

7A to 7C are cross-sectional views showing modified examples of the formed steel sheet assembling beams according to the present invention.

8 is a perspective view showing a conventional slim floor system.

9 is a cross-sectional view showing a conventional slim floor system.

<Description of Symbols for Major Parts of Drawings>

110: abdominal steel plate 112: opening 114: groove

120: first lower formed steel sheet 121: lower surface portion

122: side vertical portion 123: support portion

124: first central vertical portion 125: bent abdomen

130: second lower formed steel sheet 140: first upper formed steel sheet

141: upper surface portion 142: second center vertical portion

150: second upper formed steel sheet 200: deck plate

300: slab concrete

The present invention relates to a molded steel sheet-fabricated beam applied to a layer-reduced steel-concrete composite beam-slab system.

Steel framed building has the advantage of excellent space variability, safety and durability of the structure compared to reinforced concrete building, but there is a problem that the overall height is increased because the slab is placed on top of the steel beam.

In order to solve this problem, a slim floor (Slim Floor) method for constructing the slab can be constructed in the dance of steel beams have been developed and used in various ways.

As shown in FIGS. 8 and 9, the slim floor method uses a deep deck plate 20 or a hollow precast concrete slab to support and support the slab at the lower flange 11 of the steel beam 10. ) Consists of asymmetrical steel beams with increased width.

This is similar to a composite slab structure consisting of deck plates and concrete slabs, but unlike conventional composite slabs, the plate 12 is additionally welded to the lower flange 11 of the H-beam or square steel pipe to connect the deck plate to the lower flange of the beam member. This is to reduce the height by placing it on the welded plate.

In the case of such a slim floor composite beam-slab system, the layer height reduction effect is very good, but the limitation of the applicable slab system shows a limitation in the applicable span since the dance of the composite beam-slab is limited.

On the other hand, even in the case of the domestic composite beam-slab system developed for reducing the height of the floor, inconveniences such as low effect of reducing the height of the floor or low application efficiency during the fabrication and construction of the asymmetric steel beams have been found.

Moreover, due to the recent rise in steel prices, research on composite beam-slab systems that can fully utilize relatively inexpensive concrete is needed rather than applying the composite slab system by pure steel frame.

The present invention is to provide a molded steel sheet assembly beam improved construction and economical efficiency by eliminating floor formwork and reinforcement, while reducing floor height freely regardless of the production specifications of the synthetic slab and the span of the beam, etc. have.

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

As shown, the molded steel sheet assembly beam according to the present invention is configured by joining the four molded steel sheets on the upper and lower sides of the abdominal steel sheet. Therefore, it is possible to produce a large molded steel sheet assembly beam while satisfying the limitation of the formable steel sheet width.

The molded steel sheet assembly beam according to the present invention is largely composed of the abdominal steel plate 110, the first and second lower formed steel sheets 120, 130, and the first and second upper formed steel sheets 140, 150, these Formed steel sheets are manufactured by bending or roll forming, and may be classified into various embodiments according to the shape and assembly method of the formed steel sheet.

1 is a perspective view of a molded steel sheet assembly beam according to a first embodiment of the present invention, Figure 2 is a cross-sectional view of Figure 1, Figure 3 is a composite beam configured using a molded steel sheet assembly beam according to a first embodiment of the present invention It is a cross section.

The molded steel sheet assembly beam according to the present embodiment is configured by joining the first and second lower formed steel plates 120 and 130 and the first and second upper formed steel sheets 140 and 150 on both upper and lower sides of the abdominal steel sheet 110. .

The first and second lower formed steel sheets 120 and 130 have the same cross-sectional shape, and specifically, a lower side portion 121 and a side vertically bent vertically upward from one end of the lower side portion 121. The portion 122, the supporting portion 123 bent horizontally at the upper end of the side vertical portion 122, and the first central vertical portion 124 vertically bent upwardly from the other end of the lower surface portion 121. It is produced by molding one steel plate to have a.

At this time, the support 123 may be horizontally bent inward or outward from the upper end of the side vertical portion 122. When bent inward, the slab enters the inner side of the steel frame so that it can be more stable when deflection occurs, and since the concrete is completely enclosed by the steel cross section, the adhesion area is increased, thereby enabling better synthesis. . However, the supporting part bent inwardly is inconvenient to fill the concrete inside the steel frame when placing concrete, making it difficult to secure the seal and making the working condition of the lower reinforcing reinforcing bar in the field construction difficult. In addition, if the height of the side vertical portion is very large, there is a possibility that the accessibility to the central vertical portion is reduced and the workability of the column-beam connection is reduced. Therefore, in order to improve the workability of the site, it is preferable to bend the support portion outward.

The first and second upper formed steel sheets 140 and 150 have the same cross-sectional shape, and specifically, an upper surface 141 and a second bent vertically downward from one end of the upper surface 141. It is produced by molding one steel sheet to have a central vertical portion 142.

The bending molding assembly beam according to the present embodiment configured as described above, the lower portion 121 of the first and second lower formed steel sheets 120 and 130 forms a lower flange, the abdominal steel plate 110 and the first and second lower portions The first central vertical portion 124 of the formed steel sheets 120 and 130 and the second central vertical portion 142 of the first and second upper formed steel sheets 140 and 150 form an inner web, The upper surface portion 141 of the upper formed steel sheet 140, 150 forms an upper flange. And the side vertical portion 122 forms the outer web at the same time as the formwork when placing concrete and the supporting portion 123 is to support the slab system.

That is, the upper compression side of the molded steel sheet assembly according to the present embodiment has a narrow width of the flange and the lower tension side is a wide asymmetrical structure of the flange and freely adjust the height of the side vertical portion so that the various slabs can be installed in the dance of the assembly beam It is a shape.

Referring to FIG. 3, when the concrete 300 is poured after placing the end of the deep deck plate 200 on the support of the formed steel sheet assembly beam according to the present embodiment and reinforcing the slab reinforcement, the composite beam-slab may be constructed. Can be.

Synthetic beam-slab using molded steel sheet assembly beam according to the present embodiment maximizes the advantages of concrete and steel, and minimizes the amount of steel in the upper compression side and embeds it in concrete, thereby improving adhesion and fire resistance. It is easy to reinforce the steel plate, which can contribute to the bending resistance performance of the cement. The side verticals at both ends of the lower tension flange are free to adjust the height, so there is no limit to the applicable slab system and can be applied to various spans and dances. In particular, the side vertical portion at both ends of the lower flange acts as formwork for concrete placement and can freely adjust the height to cope with it according to the applied slab system and contribute to the improvement of torsion and shear performance during construction and synthesis.

4 and 5 are cross-sectional views of the molded steel sheet assembly beam according to the second embodiment of the present invention.

In this embodiment, the first and second upper formed steel sheets 140 and 150 are bonded to both sides of the abdominal steel sheet 110 so that a part of the upper end of the abdominal steel sheet 110 protrudes. In addition, a plurality of grooves 114 are formed on an upper surface of the abdominal steel plate 110 protruding above the upper surface portions of the first and second upper formed steel plates 140 and 150, and a plurality of openings are formed in the abdominal steel plate 110. (112) was formed. The opening 112 improves the integrity with the concrete through the dowel action, can easily penetrate the lower end of the slab, and can improve the horizontal shear strength and enhance the continuity between adjacent slabs. It can also be used as a facility space for electricity and piping.

6 is a cross-sectional view of the molded steel sheet assembly beam according to the third embodiment of the present invention.

In the present embodiment, the first and second lower formed steel sheets 120 and 130 further form a bending abdomen 125 that is bent horizontally outward from the upper end of the first central vertical portion 124. The bent abdomen 125 formed as described above may improve the concrete restraint effect of filling the space formed by the central vertical portion and the side vertical portion.

Meanwhile, in the above-described embodiments, the first and second lower formed steel sheets 120 and 130 and the first and second upper formed steel sheets 140 and 150 have been described to be symmetrical, but the first and second lower formed steel sheets are described. The steel sheets 120 and 130 and the first and second upper formed steel sheets 140 and 150 may have cross-sectional shapes that are asymmetric with each other.

That is, as shown in Figure 7a, by varying the length of the side vertical portion different slab system, for example, the second lower portion of the short side length of the side vertical portion different from the supporting portion of the first and second lower formed steel sheet (120, 130) On the support of the formed steel sheet 130, a deck plate having a deep dance (200, also called 'Deep deck') is placed on the support of the long first lower formed steel sheet 120, the dance deck deck 210, It is a deck plate bonded with truss reinforcement on a steel plate and can be installed by placing it on a flat plate. And, as shown in 7b, the width of the lower surface portion 121 of the first and second lower formed steel sheets 120 and 130 may be different.

In addition, in the above-described embodiments, the widths of the lower surfaces 121 of the first and second lower formed steel sheets 120 and 130 and the upper surfaces 141 of the first and second upper formed steel sheets 140 and 150 are Although only different cases have been described, the widths of the lower surface 121 and the lower surface 141 may be equal to each other.

As described above, by forming a plurality of molded steel sheets bonded together according to the present invention by bonding a plurality of molded steel sheets to each other, unlike the existing high layer reduction method, the height can be adjusted and various slab systems can be applied, and the cross-sectional shape of the conventional H Since it is compatible with the composite steel beam, the column-beam joining method using the existing H-beam as the assembled beam can be used without any change. In addition, because it is produced by molding in the factory, the productivity and economics at the time of manufacturing is excellent, the formwork can be omitted during the construction site, and the air is shortened because the bonding is relatively simple.

According to the present invention as described above, it is possible to adjust the height of the side vertical portion of both ends of the formed steel sheet assembly beam, and the productivity is also excellent because the molded steel sheet is produced in the factory.

In addition, the composite beam using this wraps around the central vertical steel plate constituting the inner web, and thus exhibits great adhesion performance in its cross-sectional shape. It can exhibit excellent cross-sectional performance. In addition, the cost of fireproof coating is greatly reduced due to the increase in thermal performance by concrete.

In addition, in the form of joining with the column, the existing joining method of the H-beam composite beam can be used as it is, so that the construction can be performed relatively easily without additional construction or cost burden, and very excellent joint rigidity can be secured.

Claims (5)

In the beam formed by joining a plurality of molded steel sheets, Abdominal steel plate 110, It is bonded to the lower side of the abdominal steel plate 110, the lower surface portion 121, the side vertical portion 122 is bent vertically upward from one side end of the lower surface portion 121, and the side vertical portion 122 A first lower formed steel sheet 120 formed to have a supporting portion 123 horizontally bent at an upper end of the upper surface portion, and a first central vertical portion 124 vertically bent upwardly from the other end of the lower surface portion 121; , A second lower formed steel sheet 130 which has a cross-sectional shape which is symmetrical or asymmetrical with the first lower formed steel sheet 120, and is bonded to the other lower side of the abdominal steel sheet 110 symmetrically with respect to the abdominal steel sheet 110; , A first upper part joined to an upper side of the abdominal steel plate 110 and formed to have an upper surface portion 141 and a second central vertical portion 142 bent vertically downward from one side end of the upper surface portion 141. Forming steel sheet 140, The second upper formed steel sheet 150 having a cross-sectional shape symmetrical or asymmetrical with the first upper formed steel sheet 140 and bonded to the other side of the upper portion of the abdominal steel sheet 110 symmetrically based on the abdominal steel sheet 110. Shaped steel sheet assembly beam comprising a. The method of claim 1, Shaped steel sheet assembly beam, characterized in that the abdominal steel sheet 110 is formed with a plurality of openings (112). The method according to claim 1 or 2, Formed steel sheet assembly beam, characterized in that it further comprises a bent abdomen (125) horizontally bent outward from the upper end of the first central vertical portion (124) of the first and second lower formed steel sheet (120) (130). The method according to claim 1 or 2, The first and second upper formed steel sheets 140 and 150 are bonded steel sheet assembly, characterized in that joined to both sides of the abdominal steel sheet 110 so that a part of the upper end of the abdominal steel sheet 110 protrudes. The method of claim 4, wherein Shaped steel sheet assembly beam, characterized in that a plurality of grooves 114 are formed on the upper surface of the abdominal steel plate 110 protruding above the upper surface portion of the first and second upper formed steel sheet (140) (150).

Images