KR100870068B1 - Formed steel beam for steel-concrete composite beam and slab - Google Patents

Abstract

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

Formed steel sheet assembly beam according to the present invention is configured by joining a plurality of molded steel sheet and the slab is located in the dance of the beam so that it is possible to reduce the layer height, the bottom portion and vertically bent upward from one side end of the lower surface portion A first lower formed steel sheet formed to have a side vertical portion, a support portion bent horizontally at an upper end of the side vertical portion, and a first central vertical portion bent vertically upward from the other end of the lower surface portion; A second lower formed steel sheet having a cross-sectional shape symmetrical or asymmetrical with the first lower formed steel sheet and symmetrically disposed with respect to the first central vertical portion of the first lower formed steel sheet and joined to the first lower formed steel sheet; A first upper formed steel sheet formed to have an upper surface portion, a second central vertical portion bent vertically downward from one side end of the upper surface portion, and joined to an upper side of the first central vertical portion of the first lower formed steel sheet; A second upper portion having a cross-sectional shape symmetrical or asymmetrical with the upper formed steel sheet and symmetrically disposed with respect to the second central vertical portion of the first upper formed steel sheet to be joined to the upper other side of the first central vertical portion of the second lower formed steel sheet; It characterized in that it comprises a formed steel sheet.

 Formed Steel Sheet, Beam, Assembly Beam, Composite Beam-Slab, Slim Floor

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

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

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

7A to 7E are cross-sectional views showing a modified example of the molded steel sheet assembly beam 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: first lower formed steel sheet 111: lower surface portion

112: side vertical portion 113: support portion

114: first central vertical portion 115: second bent abdomen

120: second lower formed steel sheet 210: first upper formed steel sheet

211: upper surface portion 212: second center vertical portion

213: first bent abdomen 214: opening

230: cover plate 300: deck plate

400: 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 the composite slab structure consisting of deck plate and concrete slab, but unlike general synthetic slab, the plate 12 is additionally welded to the lower flange 11 of H-beam or square steel pipe so that the deck plate is connected to the lower flange of the beam member. This is to reduce the height of the floor by placing it on the plate welded on.

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.

The molded steel sheet assembly beam according to the present invention is constructed by joining four molded steel sheets. Therefore, it is possible to provide a molded steel sheet assembly beam having a large dance while satisfying the limitation of the formable steel sheet width.

Assembling the formed steel sheet according to the present invention is largely composed of the first and second lower formed steel sheets 110 and 120 and the first and second upper formed steel sheets 210 and 220, and these formed steel sheets are bent Or it is produced by roll forming (roll forming), it can be divided 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- Sectional view of the slab.

Assembling the formed steel sheet according to the present embodiment first and second lower formed steel sheets 110, 120 and the first central vertical portion 114 of the first and second lower formed steel sheets 110, 120 interviewed with each other It is composed of first and second upper formed steel plates 210 and 220 joined to the upper outer side of the center.

The first and second lower formed steel sheets 110 and 120 have the same cross-sectional shape, and specifically, the lower surface portion 111 and the side vertically bent vertically upward from one side end of the lower surface portion 111. The portion 112, the support portion 113 bent horizontally at the upper end of the side vertical portion 112, and the first central vertical portion 114 bent vertically upward from the other end of the lower surface portion 111. It is produced by molding one steel sheet to have a.

At this time, the support portion 113 may be horizontally bent inward or outward from the upper end of the side vertical portion 112. 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 support part bent inward is inconvenient to fill the concrete inside the steel frame when placing concrete, it is difficult to secure the sealability, and the working conditions of the lower tensile reinforcing bar becomes inconvenient during site construction. 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.

Here, the first and second lower formed steel sheets 110 and 120 are joined to each other after continuous or intermittent welding.

The first and second upper formed steel sheets 210 and 220 have the same cross-sectional shape, and specifically, an upper surface portion 211 and a second bent vertically downward from one side end of the upper surface portion 211. It is produced by molding one steel sheet to have a central vertical portion 212.

At this time, the first and second upper formed steel sheets 210 and 220 are joined to the upper outer side of the first center vertical portion 114 of the first and second lower formed steel sheets 110 and 120. Bolting method is used as the joining method.

Assembling the molded steel sheet according to the present embodiment configured as described above, the lower portion 111 of the first and second lower formed steel sheets 110 and 120 forms a lower flange, the first and second lower formed steel sheets 110 ( The first center vertical portion 114 of the 120 and the second center vertical portion 212 of the first and second upper formed steel sheets 210 and 220 form an inner web, and the first and second upper formed steel sheets 210 are formed. Top portion 211 of 220 forms an upper flange. And the side vertical portion 112 forms the outer web at the same time as the formwork when placing concrete and the supporting portion 113 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 asymmetric structure of the flange and the height of the side vertical portion can be freely adjusted so that various slab systems can be installed in the dance of the assembly beam It is a molded shape.

As shown in FIG. 3, the concrete 400 is disposed after the slab reinforcing bars 410 are disposed on the supporting portions 113 of the steel plate assembly beam according to the present embodiment and the end of the deep deck plate 300 is extended. When poured, a composite beam slab can be constructed.

Synthetic beam-slab using the molded steel plate assembly beam according to the present embodiment maximizes the advantages of concrete and steel, and in the case of the upper compression side, it minimizes the amount of steel in the upper part and embeds it in concrete to improve adhesion and fire resistance performance. 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 is a cross-sectional view 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 210 and 220 are welded to each other, and the first and second upper formed steel sheets 210 and 220 are respectively disposed on the lower outer side of the second central vertical portion 212. , 2 is a structure bonded to the lower forming steel sheet (110, 120). Thus, the space portion 130 formed by joining the first and second lower formed steel sheets 110 and 120 is used to install various base hardware.

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

In this embodiment, the lower ends of the second central vertical portion 212 of the first and second upper formed steel sheets 210 and 220 are bent horizontally outward to further form the first bent abdomen 213. The first bent abdomen 213 formed as described above increases the bonding area with the concrete to increase the compounding effect and the effect of restraining the concrete to be filled in the space formed by the central vertical parts 114 and 212 and the side vertical parts 112. Can improve.

On the other hand, as shown, the cover plate 230 may be further installed to prevent the cross-section is opened by the load of the operator during lifting or construction of the side vertical portion 112 and to further improve the restraint effect of the concrete.

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

In the present embodiment, the second bent portion 115 bent horizontally outward from the upper end of the first central vertical portion 114 of the first and second lower formed steel sheets 110 and 120 is further formed.

In this embodiment, the second bent abdomen 115 enhances the concrete restraining effect filled in the same as the first bent abdomen 213 in the third embodiment.

In the above embodiments, the case in which the first and second lower formed steel sheets 110 and 120 and the first and second upper formed steel sheets 210 and 220 are symmetrical has been described, but the first and second lower formed steel sheets are described. The 110 and 120 and the first and second upper formed steel sheets 210 and 220 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 112 different slab system, for example side vertical to the support portion 113 of the first and second lower forming steel sheet 110, 120 On the support portion 113 of the second lower formed steel sheet 120 having a short length of the unit 112, a long deck plate (300, also known as a 'deep deck') having a long length is placed on the first lower formed steel sheet ( On the support portion 113 of the 110 can be installed by placing a deck plate (310, a deck truss reinforcing the truss reinforcement on the steel plate) is called a truss deck. As shown in FIG. 7B, the widths of the lower surfaces 111 of the first and second lower formed steel sheets 110 and 120 may be different from each other.

In addition, in the above-described embodiments, the widths of the lower surfaces 111 of the first and second lower formed steel sheets 110 and 120 and the upper surfaces 211 of the first and second upper formed steel sheets 210 and 220 are wide. Although only different cases have been described, as illustrated in FIG. 7C, the widths of the lower surface 111 and the upper surface 211 may be equal to each other.

Meanwhile, as illustrated in FIG. 7D, the first central vertical portion 114 of the first and second lower formed steel sheets 110 and 120 or the first and second upper formed steel sheets 210 and 220 as illustrated in FIG. 7E. It is possible to form a plurality of openings 214 in the second central vertical portion 212. The opening 214 improves the integrity between the formed steel plate assembly beam and the concrete through the dowel action, and can easily penetrate the slab reinforcing bar, thereby improving the horizontal shear strength, and between the adjacent slabs. The continuity can be enhanced and it can be used as facility space for electricity and piping.

As described above, by forming a plurality of molded steel sheets bonded together according to the present invention by joining a plurality of molded steel sheets, unlike the existing layer reduction method can be adjusted in height and various slab systems can be applied and the cross-sectional shape of the existing H Since it is compatible with the composite steel composite beam-slab, the column-beam joining method using the existing H-shaped steel 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-slab using this material is a type that wraps the central vertical steel plate constituting the inner web, and thus exhibits great adhesion performance in its cross-sectional shape. It can exhibit very good cross-sectional performance. In addition, the cost of fireproof coating is greatly reduced due to the increase in thermal performance by concrete.

In addition, since the conventional H-beam composite beam-slab joining method can be used as it is in the form of joining with a column, it is possible to construct relatively easily without additional construction or cost burden, and can secure very excellent joint stiffness.

Claims (5)

In the beam that is formed by joining a plurality of molded steel plate and the slab is located in the dance to enable the reduction of floor height, A lower surface portion 111, a side vertical portion 112 bent vertically upward from one end of the lower surface portion 111, and a support portion 113 bent horizontally at an upper end of the side vertical portion 112; A first lower formed steel sheet (110) formed to have a first central vertical portion (114) bent vertically upward from the other end of the bottom portion (111); It has a cross-sectional shape symmetrical or asymmetrical with the first lower formed steel sheet 110 and is disposed symmetrically with respect to the first central vertical portion 114 of the first lower formed steel sheet 110 and the first lower formed steel sheet ( A second lower formed steel plate 120 bonded to the 110; Is formed to have an upper surface portion 211, and a second central vertical portion 212 bent vertically downward from one side end of the upper surface portion 211, the first central vertical portion of the first lower formed steel sheet 110 A first upper formed steel sheet 210 bonded to an upper one side of the 114; It has a cross-sectional shape symmetrical or asymmetrical with the first upper formed steel sheet 210 and is arranged symmetrically with respect to the second central vertical portion 212 of the first upper formed steel sheet 210 to the second lower formed steel sheet ( And a second upper formed steel plate 220 joined to the other upper portion of the first central vertical portion 114 of the 120. The method of claim 1, Assembly of the formed steel sheet further comprises a second bent portion 115 bent horizontally outward from the upper end of the first central vertical portion 114 of the first and second lower formed steel sheets 110 and 120. Bo. The method of claim 1, Assembly of the formed steel sheet further comprises a first bent abdomen 213 horizontally bent outwardly from the lower end of the second central vertical portion 212 of the first and second upper formed steel sheet (210) (220) Bo. The method according to any one of claims 1 to 3, The first central vertical portion 114 of the first and second lower formed steel sheets 110 and 120 or the second central vertical portion 212 of the first and second upper formed steel sheets 210 and 220 may be provided in plural. Shaped steel sheet assembly beam, characterized in that the opening 214 is formed. The method of claim 4, wherein Forming steel sheet assembly beam, characterized in that it further comprises a cover plate 230 connecting the support portion 113 and the first and second bent abdomen (115) (213) to cover the lower space therebetween while restraining the gap between them. .

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