KR20110003884A - Heterogeneity reinforcing composite profile beam - Google Patents

Abstract

PURPOSE: A composite profile beam of layer elevation reduction type is provided to resist external force by properly using a steel sheet, a steel reinforcing wire and concrete. CONSTITUTION: A composite profile beam of layer elevation reduction type comprises a lower steel mold(10), an H-steel(20), a reinforcement plate(30), a stirrup steel reinforcing bar(40), a top compression bar(50), left and right steel molds and a concrete. The lower steel mold is composed of a bottom panel and both lower side panels extended upwardly from the bottom plate in a width direction.

Description

Heterogeneity reinforcing composite profile beam}

The present invention relates to a composite beam in which two members are integrated by utilizing the structural advantages of steel and reinforced concrete, and in particular, the formwork composed of thin plates is used as a permanent formwork, and the cross-section of both ends and the center of the beam is differently configured for efficiency of the cross section. The present invention relates to a layer-reduced composite beam that can economically resist external forces while increasing the height and reducing the height of a conventional composite beam.

Steel beams do not include concrete when manufacturing column beams in the conventional structural system, but concrete must be poured to construct slabs, which may increase the height of the entire building.

In order to solve this problem of increasing the height, a slim floor method using an asymmetrical steel beam having a wider width of a deep tech plate or a hollow precast concrete slab and a lower flange supporting the same is known. . However, the slim floor method has a problem in that there is a limitation in the span that can be constructed due to the limitation of the synthetic beam-slab dance.

 As another prior art for reducing the height of the floor, steel concrete is poured into the outer corners of columns and beams by placing steel beams or steel beams, assembled with reinforcement lattices between them, and installing permanent formwork with fireproof coating on the outer surface to pour concrete. There is a composite beam (Utility Model Registration No. 0166886). However, the prior art has a problem that it is difficult to reduce the floor when receiving the parent.

Another type of composite beam is the combination of two members utilizing the structural advantages of steel and reinforced concrete. Both ends of the beam are reinforced concrete beams to secure the integrity of the reinforced concrete columns, and the center of the beam is advantageous for large spans. There is a so-called "HI-BEAM". This prior art has advantages such as large diameter can be secured and air is shortened, but there are disadvantages such as difficulty in reducing the height of the floor, a large amount of steel required, and covering the exposed steel in the center.

Therefore, there is a need for a composite beam structure that can reduce the amount of steel and at the same time reduce the height of the floor height without requiring a separate fireproof coating. The present invention is to solve the above problems with the prior art has the following object.

An object of the present invention is to provide a composite beam that can be economically resistant to external forces while reducing the height of the conventional composite beam by properly utilizing the steel sheet, reinforcing steel and concrete.

According to a preferred embodiment of the present invention, there is provided a steel plate comprising: a lower steel permanent die consisting of a bottom plate and two lower side plates extending vertically upwardly from both ends in a width direction of the bottom plate; H-shaped steel joined to the upper surface of the bottom plate of both ends in the longitudinal direction of the lower steel permanent formwork; A reinforcing plate joined to an upper surface of the central bottom plate in the longitudinal direction of the lower steel permanent mold and connected to a lower flange of the H-shaped steel; A plurality of stirrup bars joined to the upper surface of the reinforcing plate at a predetermined interval and having the same height as the H-shaped steel; A plurality of upper compression bars joined to the upper flange of the H-beam and the upper surface of the stirrup reinforcement and installed over the entire length of the lower steel permanent formwork; Left and right steel permanent formwork and lower steel having an upper side plate joined to the outer side of the lower side plate of the lower steel permanent formwork and a supporting plate extending horizontally from the top of the upper side plate and positioned between the upper flange and the lower flange of the H-beam. Provided is a floor-reducing composite beam comprising concrete filled in a space surrounded by permanent formwork and left and right steel permanent formwork.

According to another suitable embodiment of the present invention, the left and right steel permanent dies are joined to the lower steel permanent dies using bolts, and the bolts are joined so that the threaded body portion faces inward.

According to another suitable embodiment of the present invention, a plurality of shear connecting members protrude from the reinforcing plate joined to the bottom plate upper surface of the center portion in the longitudinal direction of the lower steel permanent mold.

According to another suitable embodiment of the present invention, an insulation is further provided between the bottom plate of the lower steel permanent formwork and the lower flange of the H-shaped steel, which is an end reinforcement, and the reinforcement plate, which is a central reinforcement.

According to another suitable embodiment of the present invention, the upper side plates of the left and right steel permanent dies are provided with a plurality of attachment bolts in which a threaded body part is directed inward over its entire length.

According to another suitable embodiment of the present invention, the support plates of the left and right steel permanent dies are each bent inward and welded to the stirrup reinforcing bars.

According to another suitable embodiment of the present invention, the stirrup reinforcing bar is provided at both ends and the center of the center of the beam and a plurality of shear reinforcing bolts are installed therebetween, and the shear reinforcing bolts are provided with left and right steel permanent dies. Penetrate the supporting plate, and tighten and fix the nut from above and below the supporting plate.

According to another suitable embodiment of the present invention, through bolts are provided at both ends and the center of the center portion of the beam on which the stirrup rebar is installed so as to connect the upper side plates of the left and right steel permanent dies to each other.

According to the present invention, H-shaped steel, which is an end reinforcing material, is embedded in the slab, and only a minimum coating thickness is required on the H-shaped steel, so that it is possible to reduce the height of the floor. Steel permanent formwork has the advantage of improving the strength and reducing the deflection by acting as a structural role in normal times without fire.

In addition, the steel permanent formwork is modularized into the lower steel permanent formwork and the left and right steel permanent formwork, which has the advantage of easy design, manufacture and construction in two forms.

In addition, as the H-beam is installed at the end of the beam, the joint with the column becomes the same as the column-beam joint composed of the existing H-beam beam-column, so that various well-known column-beam joint details can be applied. There is no need to look for details.

In addition, the height of the left and right steel permanent formwork can be adjusted freely within the dance of the beam, there is no limitation on the type of slab applicable.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same components or parts are denoted by the same reference numerals as much as possible, and detailed descriptions of related known functions or configurations are omitted.

1 is a partial cutaway perspective view showing a state of high-precision composite beam according to the present invention before the concrete is poured, Figure 2a is a perspective view showing the end of the high-precision composite beam according to an embodiment of the present invention and Figure 2b Is a perspective view showing a central portion of the layer-reducing synthetic beam according to an embodiment of the present invention.

As shown, the layer-reduced composite beam according to the present invention, the lower steel permanent formwork (10) and the left and right steel permanent formwork (60, 61) having a formwork, the H-shaped steel 20 as the end reinforcement, the central reinforcement Consists of a concrete (70) filled in the space surrounded by the reinforcing plate 30 and the stirrup reinforcement 40, the upper compression reinforcement (50) and the lower steel permanent formwork (10) and the left and right steel permanent formwork (60, 61) do.

In the present invention, the lower steel permanent formwork 10 is synthesized integrally with the concrete 70 together with the role of the temporary formwork for placing the concrete 70 to serve as a structural material that resists external forces together with the concrete 70. The bottom plate 101 and both side lower side plates 102 and 103 extend vertically upward from both ends in the width direction of the bottom plate 101. The lower steel permanent die 10 is bent by pressing or roll forming the steel of the thin plate so that the bottom plate 101 and both lower side plates 102 and 103 are integrally formed. However, when the width of the beam is large and difficult or inconvenient to manufacture by the fleece or roll forming, the bottom plate 101 and both lower side plates 102 and 103 may be formed as separate members and welded to each other. When fabricated by welding, both lower side plates 102 and 103 are brought in at a predetermined distance from both ends in the width direction of the bottom plate 101 at a distance, that is, the bottom plate 101 protrudes from both lower side plates 102 and 103. Can be bonded as possible.

H-shaped steel 20 is joined to the upper surface of the bottom plate 101 at both ends in the longitudinal direction of the lower steel permanent die 10, respectively. This H-shaped steel 20 resists warpage and shear acting on the beam as an end reinforcement of the beam. That is, the end of the beam acts as a large shear force in the case of a simple beam and the parent moment acts in conjunction with a large shear force in the case of a continuous beam, the shear force and the simpler than the case of reinforced concrete by installing the H-shaped steel 20 at the end of the beam It can be made to have a large load capacity against the parent moment and the rigidity of the end is increased, which is also advantageous for sag and vibration. In addition, since the H-beam 20 is installed at the end of the beam, the connection with the column becomes the same as the existing column-beam joint consisting of the H-beam column, so that various well-known column-beam connection details can be applied. There is no need to find details for joining. The width of the lower flange 201 of the H-beam 20 is smaller than the width of the bottom plate 101 of the lower steel permanent mold 10 and the upper flange 202 has the same width as the lower flange 201 or more. It can have a small width and form asymmetric H-section steel as a whole.

The reinforcing plate 30 is joined to the upper surface of the bottom plate 101 in the center in the longitudinal direction of the lower steel permanent mold 10 and is connected to the H-shaped steel 20 bonded to both ends. The reinforcement plate 30 serves as a lower tension reinforcing bar as a center reinforcement of the beam and resists warpage acting on the beam together with the upper compressive bar 50 and the concrete 70. The reinforcing plate 30 preferably has the same width as the H-shaped steel 20 and the same thickness as the lower flange 201 of the H-shaped steel 20 in view of the convenience of assembly, but from an mechanical point of view, H is an end reinforcing material. Since it is to reinforce the tensile side of the beam, unlike the steel 20, it is preferable to have a larger width and a larger thickness than the lower flange 201 of the H-shaped steel 20 to increase the cross section. Therefore, the width and thickness of the reinforcing plate 30 is appropriately determined by combining the convenience of construction and structural advantages. In order to synthesize the internal concrete 70 and the reinforcing plate 30, the plurality of shear connecting members 32 may be protruded to protrude over the entire length of the reinforcing plate 30.

The upper surface of the reinforcing plate 30 is joined to a plurality of stirrups 40 having the same height as the H-shaped steel 20 at regular intervals. The stirrup reinforcing bar 40 is resistant to the shear force acting on the beam, similar to the stirrup reinforcing bar in the reinforced concrete beam. In addition, during construction, it serves as a support for preventing the left and right steel permanent formwork (60, 61) to open by the side pressure of the concrete not hardened. That is, by welding the support plates 602 of the left and right steel permanent dies 60 and 61 to the stirrup reinforcing bar 40, it is possible to prevent the left and right steel permanent dies 60 and 61 from being opened by the concrete side pressure.

A plurality of upper compressive bars 50 are reinforced over the entire length of the beam, i.e., across the entire length of the lower steel permanent formwork, across one end of the H-beam and the stub steel and the other end of the H-beam. The upper compression reinforcing bar 50 resists the bending acting on the center of the beam together with the reinforcement plate 30 and the concrete 70, and the H-shaped steel 20, which is an end reinforcement, and the stub steel reinforcement 40, which is the center reinforcement, are applied to the external force. These are connected to each other so as to be integrally fixed, and also fix the position of the stub steel 40 during construction.

The left and right steel permanent dies 60 and 61 are coupled to both lower side plates 102 and 103 of the lower steel permanent die 10, respectively. The left and right steel permanent dies 60 and 61 extend horizontally from the upper end of the upper side plate 601 and the upper side plate 601 bonded to the lower side plates 102 and 103 of the lower steel permanent die 10, respectively. It is composed of a support plate 602 located at a height between the upper flange 202 and the lower flange 201 of the H-beam 20. The left and right steel permanent dies 60 and 61 may be joined to the lower steel permanent die 10 by welding, but are preferably joined using bolts B1. The reason is that when joining with bolts (B1), not only the role of the steel permanent formwork can be connected, but also the adhesion between the steel permanent formwork and the inner concrete can be maximized, and it occurs at the interface between the steel permanent formwork, which is a different material, and the inner concrete. It can function as a shear connecting material that suppresses slip. In addition, by maximizing the adhesion between the steel permanent formwork and the internal concrete, it is possible to suppress the local buckling of steel permanent formwork composed of sheet steel. To this end, the bolt B1 is coupled so that the threaded body portion faces inward.

The upper side plate 601 and the support plate 602 constituting the left and right steel permanent dies 60 and 61 may be integrally formed by press or roll forming, but they may be formed as separate members and formed by welding. . And the support plate 602 may be bent inward or outward as a portion for mounting the formwork or deck plate 81, etc. for placing the slab concrete (80). When bending outwards, there is an advantage that concrete placing is easy, but there is a disadvantage in that it is necessary to take additional measures to prevent the left and right steel permanent dies from being opened by side pressure during concrete placing. On the other hand, there is a disadvantage in that it is difficult to fill the concrete tightly when bent inwardly, but there is an advantage that it can easily cope with the lateral pressure of the concrete if the support plate is joined to the stirrup reinforcement by spot welding.

As such, the steel permanent formwork, which serves as the formwork, is divided into lower steel permanent formwork (10) and left and right steel permanent formwork (60, 61), and assembled into these structures. Cross-sectional configuration is possible. In addition, the height of the left and right steel permanent formwork can be adjusted freely within the dance of the beam, so there is no limitation in the type of slab applicable. Therefore, not only the flat deck plate 81 shown in the drawing, but various decks such as deep decks, precast decks, and half precast decks can be freely applied.

On the other hand, when the length of the left and right steel permanent formwork (60,61) increases and the height is increased, the local buckling occurs to prevent this, the upper side plate 601 of the left and right steel permanent formwork (60,61) A plurality of mounting bolts B2 are provided over the entire length. The plurality of attachment bolts B2 are installed so that the threaded body portion faces inwardly so as to be fixed to the internal concrete 70. And it can be installed in one or two or more stages depending on the length and height of the left and right steel permanent die (60,61). The attachment bolt (B2) functions as a shear connector which induces a synthetic action by suppressing slip occurring at the interface between the steel permanent die, which is a dissimilar material, and the inner concrete, in addition to preventing buckling of the left and right steel permanent dies (60, 61). can do.

Concrete 70 is filled in the space surrounded by the lower steel permanent formwork 10 and the left and right steel permanent formwork 60 and 61. The concrete 70 is bonded at the same time to the slab concrete 80 after installing the formwork or precast bottom plate for slab casting after joining the composite beam according to the present invention to the column. Therefore, the composite beam according to the present invention has a cross-sectional shape similar to that of steel-filled beams having both ends of which are covered with thin steel and embedded with H-beams, and the center portion has a cross-sectional shape similar to that of reinforced concrete beams of which the bottom is coated with thin steel. Have.

As described above, according to the present invention, H-shaped steel, which is an end reinforcement material, is embedded in the slab, and only a minimum coating thickness is required on the H-shaped steel, thereby reducing the height of the floor, and at the same time, since the steel is located inside the concrete, it prevents buckling of the web to prevent buckling of the web. Discretion can be saved and the optimal assembly cross section can be used. In the center part, the reinforcement plate is reinforced only in the lower part, thereby saving steel quantity.

Figure 3a is a cross-sectional view showing the end of the layer-reduced composite beam according to another embodiment of the present invention, Figure 3b is a cross-sectional view showing a central portion of the layered-reduced composite beam according to another embodiment of the present invention.

Meanwhile, as shown in FIGS. 3A and 3B, between the bottom plate 101 of the lower steel permanent mold 10 and the lower flange 201 of the H-shaped steel 20, which is an end reinforcement, and the reinforcement plate 30, which is a central reinforcement. There may be further installed a heat insulating material (90) to serve as a fireproof coating. In the case of the composite beam according to the present invention, the steel + concrete and the reinforcement + concrete cross-section in the interior of the steel permanent formwork can only resist external forces, the external steel permanent formwork can contribute to the improvement of the strength of the structure during the usual additional reinforcement effect In the event of a fire, the internal steel + concrete and reinforcing steel + concrete cross-sections can ensure stability for a certain time from fire even without internal coating. The kind of the heat insulating material 90 is not particularly limited and may include gypsum board as an example.

Figure 4 is a perspective view showing a layer height reduction composite beam according to another embodiment of the present invention, Figure 5a is a cross-sectional view of the end of the layer height reduction composite beam according to another embodiment of the present invention, Figure 5b is a cross-sectional view of the central portion , 5c is a cross-sectional view of the portion where the stirrup reinforcement is placed in the center.

As shown in FIG. 4, unlike the above-described embodiments, instead of installing a plurality of stirrup reinforcing bars 40 at the center of the beam at regular intervals, only three end portions of the central part, that is, three stirrup reinforcing bars 40, are provided. Install. The stirrup reinforcement 40 serves to fix the position of the upper reinforcement (50). And a shear reinforcing bolt 42 is installed at the position of the omitted stirrup rebar 40. This shear reinforcing bolt 42 drills the support plates 602 constituting the left and right steel permanent dies 60 and 61, passes through the reinforcing reinforcing bars 42, and tightens nuts, respectively, as shown in FIG. 5B. Can be easily fixed. Shear reinforcement bolt 42 is a role of shear reinforcement of the abdomen in place of the omitted stub steel reinforcement (40) and at the same time combined with the shear connector, buckling prevention of the upper and lower side plates (102, 103, 601) and the magnetic field support of the slab. On the other hand, in the present embodiment in terms of buckling prevention of the upper and lower side plates, shear reinforcing bars 42 may be installed at both ends of the beam (see Fig. 5a). On the other hand, at the position where the stub reinforcing bar 40 is installed as shown in Figure 5c through bolt (B3) is installed to restrain the opening of the upper and lower steel permanent formwork. The through bolts B3 are installed to connect the upper side plates 601 of the left and right steel permanent dies 60 and 61 with each other. Therefore, according to the present embodiment, unlike the above-described embodiments, it is not necessary to weld the support plates 602 of the left and right steel permanent dies 60 and 61 to the stirrup reinforcing bar 40, thereby improving workability.

Although the present invention has been described above with reference to the drawings, the present invention is not limited to the embodiments and drawings disclosed herein, and various modifications may be made by those skilled in the art within the scope of the technical idea of the present invention. Can be done.

The following drawings, which are attached in this specification, illustrate the preferred embodiments of the present invention, and together with the detailed description thereof, serve to further understand the technical spirit of the present invention. It should not be construed as limited.

1 is a partial cutaway perspective view showing a state of high-precision composite beam according to the present invention before the concrete is poured.

Figure 2a is a perspective view showing the end of the layer height reduction composite beam according to an embodiment of the present invention.

Figure 2b is a perspective view showing the central portion of the layer-reducing composite beam according to an embodiment of the present invention.

Figure 3a is a cross-sectional view showing the end of the layer-reducing composite beam according to another embodiment of the present invention.

Figure 3b is a cross-sectional view showing the central portion of the layer-reducing composite beam according to another embodiment of the present invention.

Figure 4 is a perspective view showing a layer height reduction composite beam according to another embodiment of the present invention.

FIG. 5A is a cross-sectional view of an end portion of a layer-reduced composite beam according to another embodiment of the present invention, FIG. 5B is a cross-sectional view of a central portion, and 5c is a cross-sectional view of a portion where a stirrup reinforcement is disposed at the central portion.

Claims (8)

A lower steel permanent die composed of a bottom plate and two lower side plates extending vertically upwardly from both ends in a width direction of the bottom plate; H-shaped steel joined to the upper surface of the bottom plate of both ends in the longitudinal direction of the lower steel permanent formwork; A reinforcing plate joined to an upper surface of the central bottom plate in the longitudinal direction of the lower steel permanent mold and connected to a lower flange of the H-shaped steel; A plurality of stirrup bars joined to the upper surface of the reinforcing plate at a predetermined interval and having the same height as the H-shaped steel; A plurality of upper compression bars joined to the upper flange of the H-beam and the upper surface of the stirrup reinforcement and installed over the entire length of the lower steel permanent formwork; Left and right steel permanent dies having an upper side plate joined to an outer surface of a lower side steel permanent die and a support plate extending horizontally from an upper end of the upper side plate and positioned between an upper flange and a lower flange of an H-beam; And Floor-reducing composite beam comprising concrete filled in the space surrounded by the lower steel permanent formwork and the left, right steel permanent formwork. The method according to claim 1, The left and right steel permanent formwork is bonded to the lower steel permanent form using bolts, and the high-strength layered composite beam, characterized in that the bolts are joined so that the threaded body is directed inward. The method according to claim 1, Reinforcement plate bonded to the bottom plate upper surface of the central portion in the longitudinal direction of the lower steel permanent formwork, characterized in that a plurality of shear connection material protruded over the entire length of the high-strength composite beam. The method according to claim 1, High-layer composite beam, characterized in that the heat insulating material is further installed between the bottom plate of the lower steel permanent formwork and the lower flange of the H-shaped steel which is the end reinforcement and the reinforcement plate of the center reinforcement. The method according to claim 1, The upper side plate of the left and right steel permanent formwork, the high-strength layered composite beam, characterized in that a plurality of mounting bolts are installed to the inner side of the body portion formed with a thread over its entire length. The method according to claim 1, The support plates of the left and right steel permanent dies are each bent inward and welded to the stirrup reinforcement. The method according to claim 1, Stirrup rebars are installed at both ends of the center of the beam and at three places in the middle, and a plurality of shear reinforcing bolts are installed between them. Shear reinforcing bolt is a layer-reduced composite beam, characterized in that the left and right through the support plate constituting the steel permanent formwork and fixed by tightening the nut from above and below the support plate. The method of claim 7, Three-stage composite beams, characterized in that the through bolts are installed at both ends and the center of the center of the beam in which the stirrup rebar is installed to connect the upper side plates of the left and right steel permanent dies.

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