KR100740512B1 - Composite beam for girder - Google Patents

Abstract

A composite beam for a girder is provided to utilize the story height of a building to the maximum by passing ventilation ducts or wire tubes through penetration portions of an outer steel member, and to have an effective cross-section and to have a long span by installing a tension member on an outer steel member. The composite beam for a girder contains an outer steel member(100) provided with penetration portions(400) to penetrate ventilation ducts or wire tubes horizontally and composed of a lower flange(130) folded to have an inside space longitudinally, a web plate(120) projected upward to the top of the lower flange to have an inside space and provided with penetration plates to form penetration portions and an upper flange(110) folded from the web plate to have an inside space longitudinally, a lower column(200) formed between the penetration portions, inner concrete(300) filled in the outer steel member, and a tension member anchored on the end of the outer steel member and extended to the lower flange longitudinally.

Description

Composite girder for beams {COMPOSITE BEAM FOR GIRDER}

Figures 1a, 1b, 1c is a cross-sectional view of the conventional girders for girders.

2A, 2B, 2C, and 2D show examples of the assembly installation diagram and the composite girder of the external steel of the present invention.

Figure 3 shows a state in which the composite girder of the present invention according to Figure 2b is installed on a column.

<Explanation of symbols for main parts of the drawings>

100: outer steel 200: lower pillar

300: inner concrete 400: through part

500: tension member 600: inner reinforcing plate

700: duct 800: electric wire pipe

900: pillar

The present invention relates to a composite girder for beams. More specifically, the present invention relates to a composite girder in which steel materials and concrete are installed between upper surfaces of pillars in a building.

As a beam-shaped member installed between columns for a conventional building beam, reinforced concrete beam (Reinforced Concrete Beam 10, RC beam) or prestressed concrete beam (PSC beam, 20) as shown in Figure 1a and 1b In the case of), a considerable amount of concrete is used, which inevitably entails installing and dismantling reinforcement and formwork of reinforcing bars, which requires a lot of manpower and time, and due to the effects of load and environment, There was a problem in that deterioration such as reinforcing steel was inevitable, and thus, it was difficult to maintain and shorten the life of the public.

Furthermore, the RC beam 10 and the PSC beam 20 do not act as a structural cross section that bears stress in the girder section around the neutral axis in supporting the tensile and compressive stresses generated in the beam cross section due to the loading. There was a problem of being inefficient in supporting a load.

In order to compensate for the shortcomings of the RC beam and the PSC beam, as shown in FIG. 1C, a composite beam 30 having a formwork reinforcement 31 surrounded on the outside of the RC girder formed therein has been developed.

However, the composite beam 30 is simply a type surrounding the steel (reinforcement) outside the RC beam in which the reinforcing bar 32 is reinforced, so that the concrete inside does not resist the tension, and thus the self-weight is increased by using unnecessary tension-side concrete. It was pointed out that the rebar reinforcement is needed for the internal tension side reinforcement, so that it is not suitable for supporting a large upper load as a long girder.

In addition, when it is necessary to install ducts and conduits for ventilation inside buildings in the synthetic beams, RC beams, and PSC beams, the ceiling height between the bottom plate and the bottom plate is inevitably limited due to the suspension hanging under the beam. There is a need to secure more efficient ceiling heights.

An object of the present invention is to provide a composite girders for beams do not need the maintenance of the concrete member because the formwork, reinforcement for the concrete, such as RC beam or PSC beam of the existing bridge beams is not necessary.

Another object of the present invention is to provide a composite girder for beams that can sufficiently secure the low height compared to the height of the paper.

The present invention to achieve the above technical problem,

In the composite girder that is filled with concrete in the box-shaped steel,

An outer steel material (100) having a through portion (400) connected in a lateral direction such that a transverse through member (700,800) including a duct can be penetrated between both ends;

A lower pillar portion 200 formed between the through portions 400;

An inner concrete 300 filled in the outer steel 100; And

Both ends are fixed after tension in the outer steel end surface, the middle portion of the tension member 500 disposed to extend in the longitudinal direction to the lower flange portion of the outer steel;

Hereinafter, the composite girder for beams according to the present invention will be described in detail with reference to the embodiment shown in the drawings.

Figure 2a is an assembled view of the outer steel constituting the composite girder according to the present invention, Figures 2b, 2c and 2d is a completed state of the composite girder according to the upper surface.

The outer steel 100 is as shown in Figure 2a,

A lower flange portion 130 bent to form a lower inner space in a longitudinal direction;

Protruding upward from the upper surface of the lower flange portion is installed so as to face each other is formed in the abdominal inner space, the through-holes 121 are in communication with the through-plates 122, 123, 124 to the lower portion of the abdominal inner space to form An installed abdominal plate member 120; And

And an upper flange portion 110 bent to form an upper inner space from the abdominal plate member in a longitudinal direction.

The lower flange portion 130 is characterized in that the tension member 500 is disposed in the longitudinal direction in the closed lower inner space formed by bending the steel plate is fixed to both end surfaces of the outer steel material 100 after the tension. .

That is, the sheath pipe inside the sheath pipe in a state in which the sheath pipe is installed in advance so that the tension member 500 including the PC strand in a horizontal or parabolic shape may be inserted inside the lower flange portion 130 of the outer steel material 100. The PC strand can be inserted and installed, so that the inner concrete 300 is poured and cured later, and then tensioned and fixed, so that the required compression prestress is introduced into the composite girder. As a result, the advantage that the composite girder can be designed in the long-term with a more efficient cross section.

Although the lower flange portion 130 is shown in a state extending in the longitudinal direction while having a predetermined width, the width and length can be changed, the composite girder of the present invention by the lower flange portion is stable on the upper surface of the column It can be supported by.

The abdominal plate member 120 is vertically projected upwardly on the upper surface of the lower flange plate 130 so as to be spaced apart from each other so as to form an abdominal inner space, and is manufactured using two steel sheets.

The abdominal plate member 120 cuts the lower side surface to form the through hole 121 as shown in FIG. 2A, and allows both side plates 122 and 123 to be formed on the side of the through hole 121 by welding. 124 is also formed on the upper surface of the through hole 121 by welding, so that the through part 400 of the present invention is formed as shown in FIG. 2B.

Thus, each side plate and the upper plate is referred to as a through plate in the sense of the member to form a through portion, it may be formed in various shapes.

The through part 400 serves as a space through which the ventilation duct 700 or the conduit 800 passes through, as shown in FIG. 3.

That is, when the ventilation duct 700 or the conduit 800 is conventionally installed by a wire or the like under the girder, there is a problem that the use of floors is unreasonable because the ceiling distance is reduced by the space occupied by the wire. Since it is installed to penetrate the composite girder abdomen becomes very efficient in using the height of the floor.

Since only a duct or the like may not always be inserted into the through part 400, an inner reinforcing plate 600 including a bracing material or a spacer may be further installed therein as shown in FIG. 2A.

The through part 400 may be integrally formed as a single space, but may be formed to be spaced apart from each other by the lower column part 200, and preferably divided by the lower column part to secure the rigidity of the composite girder. It is preferable to form it.

In this case, the inner concrete space formed by the abdominal plate member 120 is filled with the inner concrete 300 as shown in FIG. 2B.

The lower pillar portion 200 may be naturally formed in forming a plurality of spaced apart portions in forming the through portion 400 so that the inner concrete 300 may be charged, but not the inner concrete. It can also be made into a hollow part.

To this end, the upper plate 125 may be formed on the upper surface of the lower pillar 200. In addition, the upper plate 125 may be installed, but the lower pillar filler may be filled with concrete and other materials such as urethane and epoxy resin.

The upper flange portion 110 is formed at the upper end of the abdominal plate member 120 bent to form the upper inner space from the abdominal plate member in the longitudinal direction.

The upper flange portion 110 may be bent inward to both sides inward to be horizontally extended to form the upper central opening S1 as shown in FIG. 2B so that only a portion of the upper surface of the outer steel may be opened.

The upper central opening portion S1 may serve as a space for placing the inner concrete 300 and a space for allowing the compressed steel plate 140 to be buried in the upper side of the inner concrete 300.

The compressed steel plate 140 is to be made of a member having a more efficient cross-sectional force by resisting the compressive stress due to the external force acting on the composite girder.

The compressed steel plate 140 may be installed in the longitudinal direction in the form of an integral plate 141, but may be installed as a divided steel plate 142 for ease of transportation and installation.

After all, the external steel 100 has a function as the inner concrete 300 formwork, but is synthesized with the inner concrete 300 to function as a structural member capable of integrally resisting the inner concrete against the external load.

By such a function, there is an advantage in that the fatigue stiffness is increased while the vibration and deflection of the composite girder are reduced, and thus, the external steel of the present invention may be referred to as an external formwork or an external reinforcement.

Although not shown on the inner surface of the outer steel 100, a plurality of studs are installed by welding or the like to increase the synthetic action with the inner concrete.

In addition, a plurality of studs are attached to the upper surface of the upper flange 110 of the outer steel 100 so as to be combined with the bottom plate concrete.

2c shows that the outer steel upper surface of the present invention in particular can be manufactured in an open state, so that the upper flange portion 110 is formed only from the abdominal member as a haunch portion.

That is, the upper end portion of the abdominal plate member 120 is bent inward so that the horizontal extension is formed so that the upper central opening S1 is formed, and the upper end portion of the abdominal plate member 120 is not treated separately so that the upper surface of the outer steel is completely. To stay open.

Figure 2d shows that the outer surface of the outer steel of the present invention in particular can be manufactured in a closed state, the upper flange portion 110 is to make the upper surface closed while forming the haunch portion.

That is, while the upper end portion of the abdominal plate member 120 extends inward, the lower flange plate, the abdominal plate member and the upper flange portion are formed in a closed box shape. As a result, the upper surface of the outer steel is closed, thereby forming a through hole for placing the inner concrete.

Figure 3 shows a state in which the composite girder according to Figure 2b is installed to be placed on the upper surface of both pillars (900). In other words,

It can be seen that the tension member 500 is to be arranged on the lower side of the composite girder in order to be able to install the composite girders between the long poles 900, and the through part 400 formed in the abdominal plate of the composite girder. Is formed so that the duct 700 and the conduit 800 is penetrated through it can be seen that no obstacles are also installed at the bottom of the composite girder.

Since the duct 700 and the conduit 800 are merely an example of a facility pipe, all of the different end layer transverse transmissive members may be inserted into the penetrating portion of the present invention.

In addition, the through part 400 may be placed in an empty state, and it can be seen that the inner reinforcing plate 600 which is a bracing material may be inserted and installed.

According to the present invention, the outer side is composed of steel and the inner side of which is filled with inner concrete composite girders on the compression side of the upper side of the neutral shaft, the compressive steel plate bears the compressive force according to the structural characteristics, the tension member located under the neutral shaft bears the tensile force By doing so, it acts as a composite girder that can maximize the advantages of each constituent material such as concrete, steel, and tension material, and offsets the tension caused by the weight generated during the manufacture of external steel by tensioning the tension material installed in the lower part of the composite girder step by step. In the case of making it possible, the composite girders between the long sections can be installed even with the same cross-sectional size.

In addition, compared to steel box girders made of steel only, concrete is filled inside, so there is little noise, vibration and welding amount are excellent, so fatigue performance is excellent, rigidity is large, there is little risk of local buckling, no reinforcement, and there is no possibility of corrosion. Is low. Since the inner concrete is wrapped in the outer steel, there is no need for reinforcement in the inner concrete, no need for maintenance, such as cracking, and facility pipes and conduits including ducts are formed to penetrate the abdomen of the composite girder to maximize the use of buildings. And it is possible to manufacture and construct a composite beam for girders having excellent economical efficiency, and if the characteristics of the present invention is included, the present invention may be used for construction and civil girders.

As described above, the present invention is economical girder type that is complementary to the weakness of the existing beam girders and utilizes its strengths, and has a long span at low mold height, and is advantageous in terms of life cycle cost due to low maintenance cost as well as initial construction cost. In addition, the appearance of the girders is aesthetically advantageous, as well as its mechanical advantages. An embodiment of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. Those skilled in the art of the present invention can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

Claims (8)

In the composite girder that is filled with concrete in the box-shaped steel, An outer steel forming a through portion communicating in a transverse direction such that a transverse through member including a duct can pass between both ends; Inner concrete filled in the outer steel; And Both ends are fixed after the tension in the outer steel end surface, the middle portion is a tension member disposed to extend in the longitudinal direction to the outer steel; composite girders for beams comprising a. The composite girder for beams according to claim 1, wherein the through part is formed of a plurality of through parts separated by one or a lower pillar part. According to claim 1, wherein the outer steel is to be formed in the form of I-shaped cross-section box, the overall shape, A lower flange portion bent to form a lower inner space in a longitudinal direction; An abdominal plate material protruding upward from the upper surface of the lower flange part so as to face each other, and having an inner abdominal space formed therein, and a through plate disposed below the inner abdominal space such that the through hole is in communication with the through hole; And And an upper flange portion bent to form an upper inner space in the longitudinal direction from the abdominal plate material. The upper surface of the upper flange portion is Open top surface; A partially open upper surface formed by horizontally bending the upper end portion of the abdominal plate member so as to form an upper central opening; And Shear surface closed upper surface is formed concrete filling hole; Synthetic girder, characterized in that any one. The composite girder for beams according to claim 3 or 4, wherein a compressed steel plate is further embedded in the upper flange portion in the longitudinal direction. The composite girder according to any one of claims 1 to 4, wherein the through portion is further provided with a transverse through member including a facility pipe or a conduit inside the building to be supported by the composite girder. The lower pillar portion according to any one of claims 2 to 4, wherein a lower pillar filler including an empty space or an inner concrete is filled in the lower pillar portion formed between the through portions, but the lower pillar portion is formed to form the empty space. Composite beam for beams, characterized in that the upper plate is further formed on the upper side of the lower column to be closed. The composite girder for beams according to any one of claims 1 to 4, further comprising an inner reinforcing plate including a bracing material or a spacer material inside the through part where the lateral through member is not provided.

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