KR100646661B1 - Hybrid beam for slim-floor and slim-floor structure using the same - Google Patents

Abstract

A deformation section composite beam for a slim floor and a slim floor structure using the same are provided to reduce the floor height according to the smooth bonding process of neighboring columns or beams as the beam dept of the center part is narrower than the beam depth of the both ends. A deformation section composite beam(100) for a slim floor comprises a steel frame beam(110); upper and lower reinforcing bars horizontally distributed with the longitudinal direction of the steel frame beam and placed at upper and lower sides; a band reinforcing bar(140) distributed to cover the upper and lower reinforcing bars; and a beam concrete(150) where the upper part of the steel frame beam and the upper parts of the upper and band reinforcing bars are exposed, and the lower part of the steel frame beam and the lower parts of the lower and band reinforcing bars are placed. The steel frame beam is placed only at the center part, and the upper/lower and band reinforcing bars and the beam concrete is uniformly distributed. The center part is completed as a steel frame reinforced concrete structure, and the both ends are completed as a reinforced concrete structure. The beam dept of the center part is narrower than the beam depth of the both ends. The lower reinforcing bar contains first and second reinforcing bars.

Description

Composite beam for slim floor and slim floor structure using the same {Hybrid beam for slim-floor and slim-floor structure using the same}

1 is a schematic cross-sectional view (b) of examples (a) of various conventional composite structures and a beam structure in a state in which facility piping is installed on these structures.

Figure 2 is a perspective view showing an embodiment of a modified cross-section composite beam for a slim floor according to the present invention.

3 is a longitudinal cross-sectional view (a) and a widthwise cross-sectional view (b) of another embodiment of a modified cross-section composite beam for a slim floor according to the present invention.

Figure 4 is a construction sequence diagram of a slim floor structure is completed using a modified cross-section composite beam for the slim floor of FIG.

5 is a cross-sectional view in the width direction (a) and the longitudinal cross-section (b) of the completed slim floor structure in accordance with the construction sequence of FIG.

FIG. 6 is a schematic cross-sectional view of a slim floor structure in which facility piping is installed on a completed slim floor structure according to the construction procedure of FIG. 4.

7 is a schematic view of a state in which the modified cross-section composite beam for the slim floor according to the present invention is installed only in a partial section.

<Description of the symbols for the main parts of the drawings>

100: composite beam

110: Cheolgolbo 115: stud bolt

120: lower bar 130: upper bar

140: band reinforcement 150: boconcrete

200: slab

210: half PC slab 220: slab rebar

250: slab concrete

300: facility piping

The present invention relates to a modified cross-section composite beam for a slim floor and a slim floor structure using the same, and more particularly, to properly induce the joining of adjacent columns or beams constructed of reinforced concrete by appropriately combining steel and reinforced concrete. At the same time, the present invention relates to a deformed cross-section composite beam and a slim floor structure using the same, allowing the reduction of the centering space to be used as an installation space for facility pipes crossing the beams.

The most important and frequent construction materials in the construction work are steel and concrete, steel is strong in tension and concrete is effective in compressive. The composite structure combines these two materials with each other to take full advantage of each other. When the steel is subjected to compressive force, the concrete effectively resists buckling, and thus the overall compressive strength of the composite structure can be expected. At this time, concrete also serves to protect the steel initially from rust prevention and high heat of the steel.

In addition, due to the diversification of construction technology and the lack of construction labor due to the recent economic development, prospective review of precast construction method is being conducted in the existing site-oriented reinforced concrete construction method. In particular, considering the traffic problems in the downtown area and the rapid construction period, it is necessary to develop a construction method that minimizes the construction of the parts made in advance in the factory.

Considering the structural, economical, and constructional aspects as described above, there is a (precast) synthetic structure that is a combination of steel cheolgol (or composite beam) and reinforced concrete slab.

1 is a schematic cross-sectional view (b) of examples (a) of various conventional composite structures and beam structures in a state in which facility piping is installed on these composite structures. As shown in FIG. 1 (a), the conventional composite structure is mainly composed of a cheolgolbo (or synthetic beam) and a composite of the reinforced concrete slab thereon. In this way, in a building with a composite structure, the facility pipe is installed in the lower part of the beam as shown in Figure 1 (b), the ceiling will be the height from the floor to the facility piping. In other words, the ceiling height is the height of the floor minus the height of installation and installation of the plumbing.

On the other hand, efforts to reduce costs in building construction have been attempted in various ways, and cost reduction through floor height reduction is one of them.

Underground parking lot usually consists of multiple underground floors, and the vehicle load and the finishing load of the upper floor of the underground parking lot acting as vertical load are considerably higher than the load applied to the general floor of the building (especially the roof floor of the underground parking lot). It is required that the cross section of the member be quite large on the floor where the building is not constructed and the road is constructed. Accordingly, it is legally stipulated that the ceiling height (inner floor, the height from the floor of the parking lot to the ceiling installation) is secured at 2.3 m in the driving section and 2.1 m or more in the parking section. In order to satisfy these requirements, most underground parking lots have a facility space (more than 0.3m), bowing (0.8m-0.9m), ceiling height (2.3m), as shown in FIG. It is designed.

As a method for reducing the height of the underground parking lot, a wide beam system that reduces the dance of the beam and increases its width has been tried, but it is limited to reduce the bowing to obtain the structural performance necessary to support the high load applied to the underground parking lot. Because of this, it was difficult to expect a great effect on floor savings. Rather, it is expected that new problems such as joining problems with pillars due to the excessively wide beam width, the possibility of sagging at the construction stage, and the increase of the quantity of the frame are expected.

Accordingly, the present inventors have developed a composite cross-section composite beam and a slim floor structure using the same as a composite beam to secure economical efficiency, workability, structural stability, to implement a slim floor structure by reducing the bowing of the part passing through the facility piping to form a deformation cross section Was done.

The present invention has been made to improve the above-mentioned problems, by appropriately combining the steel frame and reinforced concrete to induce a smooth connection with adjacent columns or beams constructed of reinforced concrete and at the same time reduce the bowing of the center The purpose of the present invention is to provide a deformed cross-section composite beam that can reduce the height of the floor while having the same ceiling height as a whole.

Another object of the present invention is to increase the number of floors of the building for the same building height by applying the deformed cross-section composite beam that can reduce the height of the floor, and in the case of the underground space can reduce the amount of structural materials while reducing the amount of breakage It is to provide a slim floor structure that contributed to the overall economics of the building.

The present invention for achieving the above object, Cheolgolbo; Upper and lower reinforcing bars are respectively reinforced above and below the cheolgolbo parallel to the longitudinal direction of the cheolgolbo; A band reinforcing bar to surround the upper and lower reinforcing bars; And, the upper, the upper reinforcement and the upper portion of the band reinforcing bar beam concrete exposed to the upper portion of the lower, the lower reinforcing and the band reinforcing bar is buried concrete; is configured to include, but the steel cheolgolbo disposed only And the upper and lower reinforcing bars, the band reinforcing bars, and the bocon concrete are disposed throughout, the central part is completed with a steel reinforced concrete structure (SRC), and both ends are completed with a reinforced concrete structure (RC), and the central part in which the steel beam is disposed It provides a deformed cross-section composite beam for the slim floor that the bowing is formed smaller than the bowing of both ends.

In addition, the present invention, the deformed cross-section composite beam formed in the bowing of the center portion smaller than both ends provided at the beam position; A slab integrated with the modified cross-section composite beam by placing concrete so that the exposed portion (the upper part of the steel frame beam, the upper reinforcing bar and the band reinforcing bar) is embedded in the modified cross-section composite beam; It provides a slim floor structure comprising a; and the installation pipe is installed using the space secured by the small bowing in the central portion of the deformed cross-section composite beam.

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

Figure 2 is a perspective view showing one embodiment of a modified cross-section composite beam for a slim floor according to the present invention, Figure 3 is a longitudinal cross-sectional view (a) and a widthwise cross-sectional view (b) of another embodiment of a composite beam for a slim floor 2 and 3 are all common in that they are factory precast members, but are classified according to the reinforcement timing (site or factory reinforcement) of the upper reinforcement 130 and the connection of the stud bolts 115. Even though precast composite beams, the upper reinforcement 130 is completely exposed without being buried in boconcrete, unlike the steel frame 110 and the band reinforcing bar 140, so that the site reinforcement is also possible, in view of this Figure 2 (site reinforcement) And Figure 3 (factory reinforcement) is proposed by dividing into examples. In addition, the embodiment of Figure 3 is further bonded to the stud bolt 115 to the upper surface of the H-beam upper flange. Of course, the composite beam as shown in Figures 2 and 3 can be constructed in its entirety.

Deformed cross-section composite beam 100 of the present invention is a composite beam that is a combination of steel and reinforced concrete, the center portion is a steel reinforced concrete structure (SRC) and both ends are reinforced with a reinforced concrete structure (RC), but the center portion is formed smaller than both ends of the reinforcement Compared to this, it is characterized by using the reduced gaze as a space for facility piping. In other words, the center part is completed by RC will be a structural strength is improved by the reinforcement of the cheolgolbo 110 will be able to reduce the bowing, and the end of the RC is structural strength is reduced compared to the center part is completed by SRC that The dance is enlarged and complemented to realize a deformation cross section of the bowing of the end and the center as a whole.

Such deformed cross-section composite beams reduce the amount of steel used rather than complete SRC structure to secure economic feasibility, and at the same time continuity and integration in the treatment of the joints with adjacent beam members and / or columns, which are made of (steel) reinforced concrete structures. It is advantageous in that the castle can be secured. In addition, the central portion of the composite beam secured by reducing the bowing can be utilized as the installation space of the facility pipes installed across the beam, and as a result, all or part of the installation height of the facility pipe 300 is accommodated as the bowing to secure the same ceiling height. It can be expected to reduce the floor height.

In such a deformed cross-section composite beam, it is preferable that one end of the beam is increased to 1/4 of the span l of the beam, and the center of the beam to become smaller is 1/2 of the span of the beam. This is because the moment in the structure where the L / 4 point is completed in the boss span becomes zero, so it is most desirable to deform the cross-sectional structure at this point in consideration of structural stability and economics. However, since the cheolgolbo 110 that is disposed only in the center portion and contributes to reducing the bowing of the center part should be settled stably at both ends of the RC structure, the cheolgolbo is substantially shorter than the overall length of the deformed cross-section composite beam, but the bowing becomes smaller A member longer than length will be needed.

The present embodiments are completed with RC composite beams (1) and the first reinforcement (120a) and the bottom of the first reinforcement (120a) is reinforced so that the lower reinforcement 120 is disposed throughout the composite beam 100 at both ends of the composite beam (100) The reinforcement is designed to be composed of the double reinforcement of the second reinforcing rod (120b) to be disposed only at both ends of the 100 is formed so that the central portion of the composite beam 100 is smaller than the both ends.

Figure 4 is a construction sequence diagram of a slim floor structure completed using a modified cross-section composite beam for the slim floor of Figure 2, Figure 5 is a widthwise cross-sectional view (a) and length of the completed slim floor structure in accordance with the construction sequence of Figure 4 Directional cross-sectional view (b), Figure 6 is a schematic view of the slim floor structure cross-sectional view of the installation of the installation pipe in the slim floor structure completed according to the construction sequence of FIG. The slim floor structure of the present invention will be described with reference to these.

In Figure 4 by adopting the modified cross-section composite beam 100 of Figure 2 prepared in advance in the factory and reinforce the upper reinforcement 130 in the field with the slab reinforcement 220 as shown in Figure 4 (c) and 4 (b) have. As such, adopting the deformed cross-section composite beam 100 as a precast member reduces the field work and simultaneously includes the upper reinforcement 130 reinforcement in the reinforcement process of the slab reinforcement 220 in the field. It is effective in reducing the weight in the weight of 100).

Slim floor structure of the present invention is a modified cross-section composite beam 100 as shown in Figures 2 and 3; A slab (200) integrally constructed with the modified cross-section composite beam (100) by placing concrete so that the exposed portion (the upper part of the steel golbo beam, the upper reinforcing bar and the band reinforcing bar) is embedded in the modified cross-section composite beam; And a facility pipe 300 installed using a space secured by a small bow in the center of the deformed cross-section composite beam 100. As described above, since the central portion of the deformed cross-section composite beam 100 is formed with a small bowing, it is possible to install the facility pipe 300 that crosses the beam through the secured space, and thus, a floor height reduction effect can be expected.

In the slim floor structure according to the present invention, when the deformed cross-section composite beam is constructed as a precast member manufactured in a factory, it is preferable to construct the slab 200 using a permanent slab formwork which does not need to be dismantled. Permanent slab formwork can be used (synthetic) deck plate, half PC slab 210, etc., and is mounted on the upper surface of the boconcrete 150 of the modified cross-section composite beam between the modified cross-section composite beam (100). The slab reinforcement 220 is reinforced on the permanent slab formwork and above the deformed cross-section composite beam, and when the slab concrete 250 is poured in the site so that the exposed portion and the slab reinforcement are buried in the deformed cross-section composite beam 100, The composite beam 100 and the slab 200 are integrated.

Such a slim floor structure would be more advantageous when applied to the case that the floor height must be increased due to the need for a large brace member to support a high load such as an underground parking lot, and in particular, the facility piping is installed across the beam as shown in FIG. 7. It is preferable to selectively employ only the section.

According to the present invention as described above, by appropriately combining the steel frame and the reinforced concrete, the central portion and both ends are completed in a heterogeneous structure (center portion-steel reinforced concrete structure (SRC), both ends-reinforced concrete structure (RC)) and at the same time By manufacturing the composite beams smaller than both ends, the joints with adjacent columns or beams constructed in the same homogeneous structure by both ends of the RC can be smoothly processed, and further, the facility pipes that cross the beams of the reduced center of the SRC are reduced. Since it can be used as an installation space, it is possible to reduce the floor height while having the same ceiling height as a whole. In addition, by applying a composite cross section beam that can reduce the height of the floor, it is possible to increase the number of floors of the building for the same building height. Furthermore, in the case of underground space, it is connected to the reduction of the amount of breakage and structural materials, which contributes to the overall economy of the building. It is expected to be.

Claims (6)

Cheolgolbo; Upper and lower reinforcing bars are respectively reinforced above and below the cheolgolbo parallel to the longitudinal direction of the cheolgolbo; A band reinforcing bar to surround the upper and lower reinforcing bars; And, Boconcrete is placed so that the lower part of the cheolgolbo, the lower reinforcing bar and the lower part of the band reinforcement in the exposed state of the upper, upper reinforcing bar and the band reinforcing bar; Consists of including The steel ball is arranged only in the center portion and the upper and lower reinforcing bars, band reinforcement and bocon concrete are arranged throughout the center portion is completed with a steel reinforced concrete structure (SRC) and both ends are completed with a reinforced concrete structure (RC), Deformed cross-section composite beam for a slim floor, characterized in that the boulge of the center portion is arranged cheolgolbo is smaller than the boulge of both ends. In claim 1, The lower reinforcement is composed of a first reinforcement is arranged to be disposed over the entire deformed composite beam; and a second reinforcing bar arranged to be disposed only at both ends of the deformed cross-section composite beam below the first reinforcement; Deformed cross-section composite beam for slim floor, characterized in that the bowing is formed small. In claim 2, Both ends of the deformed cross-section composite beam is formed to have a quarter length of each of the boss span (ℓ), the modified cross-sectional composite beam for the slim floor, characterized in that. The method according to any one of claims 1 to 3, The cheolgolbo deformed cross-section composite beam for the slim floor, characterized in that the stud is further bonded on the upper flange to the H-beam. Deformed cross-section composite beam of any one of claims 1 to 3 installed in the beam position; A slab integrated with the modified cross-section composite beam by placing concrete so that the exposed portion (the upper part of the steel frame beam, the upper reinforcing bar and the band reinforcing bar) is embedded in the modified cross-section composite beam; And, Facility piping is installed by using the space secured to the small bow in the center of the deformed cross-section composite beam; Slim floor structure, characterized in that comprising a. In claim 5, The modified cross-section composite beam is a precast member manufactured at the factory, The slab is a permanent slab formwork is installed mounted on the upper surface of the boconcrete of the modified cross-section composite beam between the modified cross-section composite beam; Slab reinforcement is reinforced on the permanent slab formwork and above the deformed cross-section composite beam; And on-site placing slab concrete in which the exposed portion and the slab reinforcing bar are embedded in the deformed cross-section composite beam.

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