WO2012093836A2

WO2012093836A2 - Composite beam having concrete member precasted or casted in place and construction method using same

Info

Publication number: WO2012093836A2
Application number: PCT/KR2012/000048
Authority: WO
Inventors: 김점한; 조영상
Original assignee: 주식회사 네오크로스구조엔지니어링
Priority date: 2011-01-06
Filing date: 2012-01-03
Publication date: 2012-07-12
Also published as: KR101049880B1; WO2012093836A3

Abstract

A composite beam according to the present invention has a low weight such that the composite beam may be easily lifted. Therefore, the constructability thereof is superior and transport fees thereof or the like are reduced. In addition, concrete consumption is small such that the composite beam is environmentally-friendly and may be easily coupled with columns.

Description

Composite beam having concrete member made by precast or cast in place, and construction method

The present invention relates to a composite beam, and more specifically, because the weight is small, the weight is easy, the workability is excellent, the logistics cost, such as transport cost is reduced, because the concrete consumption is small, eco-friendly, fastening with the pillar The invention relates to a composite beam that is easy and provides enough space for the operator to step on the slab, eliminates the risk of injury to the operator, and can unify deck plate specifications. The present invention also relates to a construction method of such a composite beam.

This application claims priority based on Korean Patent Application No. 10-2011-0001530 filed on January 6, 2011, and all the contents disclosed in the specification and drawings of the application are incorporated in this application.

In general, the beam (beam) is a structure that is installed to connect the column and the pillar to support the load, and supports the load transmitted from the slab. Such a beam is typically a steel frame having a cross section of an “industrial” shape, a concrete member placed to enclose the steel frame, steel bars embedded in the concrete member along the longitudinal direction of the steel frame, and lower flanges and steel bars of the steel frame. Stirrups embedded in the concrete member to surround the.

When the slab is completed, when the beam is firmly fastened to the pillar, the bending moment is largely applied at both ends of the beam and the center of the beam, and the shear force is greatly applied at both ends of the beam. On the other hand, concrete is strong in compressive force but small in tensile resistance. In light of this, the present applicant, as shown in Figs. 1 and 2, places less concrete in the center of the beam 10 so as to reduce the cross-sectional area and to increase the concrete cross-sectional area at both ends of the beam 10. . The beam 10 has the advantage of being able to effectively cope with the moment and shear force acting on both ends while reducing the amount of concrete used.

However, the beam 10 has a problem that the operator is very inconvenient during slab construction because the stub 11 protrudes on the upper surface of the concrete member 12. At the time of slab construction, the protruding stirrup 11 often causes a worker to not only have a lack of space to step on the foot, but also to stumble or injure the protruding stub 11. In the case where the concrete member 12 is manufactured by PC (precast) at the factory, when the beam 10 is rigidly welded to the column 20, the upper and lower flange welding work or the web of the concrete member 12 is performed by the precast concrete member 12. There is a problem that the high-strength bolt 23 fastening operation is difficult.

In addition, as shown in Figure 3, to install the deck plate (d) for the construction of the slab, the deck plate (d) is installed to be mounted on the upper surface and the upper flange 13 of the concrete member (12).

However, the length of the deck plate d mounted on the upper surface of the concrete member 12 and the deck plate d mounted on the upper flange 13 due to the protruding stub 11 should be different. That is, the deck plate (d) to be mounted on the upper surface of the concrete member 12 should have a shorter length than the deck plate (d) to be mounted on the upper flange 13, and therefore, the construction site is mounted on the upper flange (13) The deck plate (d) to be cut by a predetermined length to make the deck plate (d) to be mounted on the upper surface of the concrete member (12). Therefore, the construction is delayed and inefficient by the time required for the cutting.

On the other hand, in general, when the beam (beam) is manufactured in a rigid beam (steel beam) or prestressed method in which the gravity load acts, the compressive stress is applied to the lower portion of the beam cross-section and the tensile stress is applied to the upper portion of the beam cross-section. When the slab is constructed on the beam, the compressive stress acts on the upper end of the beam cross section by the load of the slab or the like, and the tensile stress acts on the lower end of the beam end face.

Therefore, in general, when manufacturing a beam in a rigid beam or prestressed manner in which gravity load is applied, it is not necessary to pour concrete to the portion where the tensile stress acts, that is, the upper part of the neutral axis. This is because the upper slab receives the compressive stress due to the fixed load and the live load even when the slab is constructed even if the concrete is not poured on the portion where the tensile stress is applied.

In addition, as shown in Figures 1 and 4, when the concrete is cast to the portion where the tensile stress acts, for example, the upper flange 13, the flange 21 and the concrete member of the column 20 Since the bolt 23 must be installed in the through hole 15 and the coupling hole 25 in the narrow space between the 12, the work is not easy and the working speed is lowered.

The present invention has been designed to solve the above problems, and has an object of providing a composite beam, which is easy to lift due to its small weight, which is excellent in workability and reduces logistics costs such as transportation costs.

Another object of the present invention is to provide an environment-friendly composite beam because the concrete consumption is small.

Still another object of the present invention is to provide a composite beam that is easy to fasten with a pillar.

Still another object of the present invention is to provide a composite beam that provides a sufficient space for the operator to step on the slab and eliminates the risk of injury to the operator.

It is still another object of the present invention to provide a composite beam capable of unifying the specifications of the deck plate used in slab operation.

Another object of the present invention to provide a construction method using such a composite beam.

In order to achieve the above object, the composite beam according to the present invention includes a steel frame which is formed in the longitudinal direction to form the entire length of the beam and has a '工' shape cross section; A concrete member for embedding a portion of the web of the steel frame and the lower flange therein; Reinforcing bars embedded in the concrete member along the length direction; And a stub disposed at predetermined intervals along the longitudinal direction and installed to surround the lower flange of the steel frame and the reinforcing steel. The upper flange of the steel frame is exposed to the outside without being embedded in the concrete member, the stirrup is embedded in the concrete member is not exposed to the outside.

The concrete member may be installed only at both ends of the steel frame without being installed at the center of the steel frame.

In addition, in order to increase the coupling force between the concrete member and the steel frame, the lower flange or the web may be provided with a stud or at least a part of the reinforcing bar may be welded to the web and coupled.

On the other hand, the composite beam according to the present invention, the steel frame is formed long in the longitudinal direction to constitute the entire length of the beam having a '工' shape; A concrete member coupled to the bottom surface of the lower flange of the steel frame; Reinforcing bars embedded in the concrete member along the length direction; And a stub disposed at predetermined intervals along the length direction and installed to surround the reinforcing bars. The upper flange and web of the steel frame are exposed to the outside without being embedded in the concrete member, and the stub is embedded in the concrete member and is not exposed to the outside.

The width w1 of the concrete member may be equal to the width w2 of the lower flange.

In addition, the concrete member may be installed only at both ends of the steel frame without being installed at the center of the steel frame.

In addition, a stud may be installed on the lower surface of the lower flange to increase the bonding force with the concrete member.

In addition, the composite beam according to the present invention, the steel frame is formed long in the longitudinal direction to constitute the entire length of the beam; A plate whose upper surface is coupled to the lower end of the steel frame; And a concrete member in which the plate is embedded so that the upper surface of the plate is exposed to the outside. At this time, the steel frame is exposed to the outside without being embedded in the concrete member.

The steel frame may have at least one of a cross section of an 'engine' shape, a cross section of a 'T' shape, and a cross section of which a width of the lower flange is narrower than that of the upper flange.

The composite beam may include a stub installed to be embedded in the concrete member at predetermined intervals along the longitudinal direction. The stub is connected to the bolt and the concrete member and the plate and the steel frame by both ends thereof penetrate the plate and the lower flange.

The plate and the concrete member may be installed only at both ends of the steel frame and may not be installed at the center of the steel frame.

The steel frame may have a cross section having a central portion at an industrial shape and both ends thereof having a cross section having a T shape. At this time, the steel frame and the plate may be formed to extend more toward the pillar than the concrete member.

According to another aspect of the present invention, a method of constructing a composite beam includes: installing a pillar; And connecting the composite beam to a pillar.

At this time, it is preferable that the deck plate for constructing the slab is mounted on the upper flange of the composite beam and is not mounted on the concrete member, and thus the length of the deck plate can be unified.

After manufacturing the assembly of the plate and the concrete member and manufacturing the steel frame, the assembly and the steel frame can be combined in the field or factory.

The concrete member preferably extends further towards the column than the concrete surface of the column.

The present invention will be described in detail with reference to the following drawings, but these drawings illustrate preferred embodiments of the present invention, and the technical concept of the present invention is not limited to the drawings and should not be interpreted.

1 is a perspective view showing a composite beam according to the prior art.

FIG. 2 is a cross-sectional view taken along line AA ′ of FIG. 1.

FIG. 3 is a plan view illustrating the composite beam of FIG. 1 and shows a deck plate installed. FIG.

4 is a front view showing that the composite beam of FIG. 1 is connected to a pillar.

5 is an exploded perspective view showing a composite beam and a pillar according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view taken along line BB ′ of FIG. 5.

7 is a front view illustrating that the composite beam and the pillar of FIG. 5 are connected.

8 is a perspective view showing a composite beam according to a second exemplary embodiment of the present invention.

FIG. 9 is a cross-sectional view taken along line CC ′ of FIG. 8.

10 is a perspective view showing a composite beam according to a third exemplary embodiment of the present invention.

FIG. 11 is a cross-sectional view taken along line D-D 'of FIG. 10.

12 is an exploded perspective view showing a composite beam according to a fourth embodiment of the present invention.

13 is a cross-sectional view illustrating the composite beam of FIG. 12.

14 and 15 are cross-sectional views showing steel frames that can be used in the composite beam of FIG. 12, respectively.

16 is a perspective view showing a composite beam according to a fifth embodiment of the present invention.

17 is a cross-sectional view illustrating the composite beam of FIG. 16.

18 is a perspective view showing a composite beam according to a sixth embodiment of the present invention.

19 is a perspective view showing a composite beam according to a seventh embodiment of the present invention.

20 is a perspective view showing a composite beam according to an eighth embodiment of the present invention.

21 is a perspective view showing a composite beam according to a ninth embodiment of the present invention.

22 is a perspective view showing a composite beam according to a tenth embodiment of the present invention.

FIG. 23 is a front view illustrating that a composite beam according to an eleventh embodiment of the present invention is coupled to a pillar.

FIG. 24 is a cross-sectional view taken along line H-H 'of FIG. 23.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention. Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

5 is an exploded perspective view illustrating a composite beam and a pillar according to the first embodiment of the present invention, and FIG. 6 is a cross-sectional view taken along line BB ′ of FIG. 5.

Referring to the drawings, the composite beam 100 is a steel frame 30 having a '工' cross-sectional shape, the concrete member 40, the reinforcing steel bar 50 disposed along the longitudinal direction of the steel frame 30, and the lower The stub 55 is installed to surround the flange 33 and the reinforcing bar 50.

Steel frame 30 is formed long in the longitudinal direction to form the entire length of the beam 100, and has a cross section of the '工' shape. The steel frame 30 includes an upper flange 31, a web 32, and a lower flange 33.

Both ends of the steel frame 30 is preferably exposed to the outside without being embedded in the concrete member (40). Through holes 35 are formed in the exposed both ends, and fastening bolts 23 are inserted into the through holes 35. The fastening bolt 23 is inserted into the coupling hole 25 and the through hole 15 formed in the connecting portion 22 of the pillar 20 and then coupled to the nut to couple the beam 100 and the pillar 20.

The concrete member 40 is installed along the longitudinal direction of the steel frame 30. The concrete member 40 embeds a portion of the web 32 and the lower flange 33 therein. In addition, the concrete member 40 does not extend to both ends of the steel frame 30 but extends only to a portion proximate to both ends, to the surface of the concrete of the pillar 20 when the pillar 20 is covered with concrete, or It is preferable to extend approximately 10 mm further toward the pillar 20 than the surface of the concrete.

In general, a tension force is applied to the upper ends of the steel beams and a compressive force is generated at the lower ends of the steel beams when the gravity direction is applied. When the steel beam bears the shear force, it is safe in structural strength.

Even when the composite beam is manufactured in a prestressed manner, the compressive stress acts on the lower portion of the neutral axis and the tensile stress acts on the upper portion of the neutral axis. Since concrete is strong in compressive stress and weak in tensile stress, it is preferable to install only up to the neutral axis or below the neutral axis. Therefore, the web 32 and the upper flange 31 above the neutral shaft are exposed to the outside without being embedded in the concrete member 40. An upper slab (not shown in the figure) is placed on the exposed portion. When the upper slab is completed, the upper slab is subjected to compressive stress and the lower flange 33 is subjected to tensile stress.

In addition, the composite beam 100 can reduce the manufacturing cost of the composite beam 100 and reduce the amount of CO ₂ generated by reducing the amount of concrete used, and improves the construction and logistics by reducing the weight of the composite beam 100 Reduce costs

In addition, since both ends of the steel frame 30 is exposed to the outside and the concrete member 40 embeds only a part of the web 32 therein, it is easy to connect the composite beam 100 and the pillar 20. That is, as shown in Figure 7, since the relatively wide space is secured to the flange 21 side direction of the column 20, the coupling work using the fastening bolt 23 is facilitated. Conventionally, since the concrete member 12 embeds the web 32 and the upper flange 31 therein, sufficient space cannot be secured on the lateral side of the flange 21.

Furthermore, in the past, concrete is poured to the upper flange (13 of Figs. 1 and 3) and the stirrup 11 is exposed to the outside, so it is mounted on the deck plate (d) and the upper flange 13 mounted on the concrete member 12. The length of the deck plate (d) was to be different (this problem has been described in the background art). In the present invention, because all the deck plate (d) is mounted on the upper flange 31 can solve the above problems and can unify the standard of the deck plate (d in FIG. 3).

Reinforcing bar 50 is embedded in the concrete member 40 along the longitudinal direction of the steel frame (30). When manufacturing the composite beam 100 in a prestressed manner, concrete is poured in a state where tension is applied to the reinforcing bar 50, and thus the reinforcing bar 50 applies a compressive force to the concrete member 40.

The rebar 50 is preferably arranged around the lower flange 33. At least some of the reinforcing bars 50 are preferably welded to the web 32 to be joined, in order to integrate the concrete member 40 and the steel frame 30.

On the other hand, as an alternative to welding some of the rebar 50 to the web 32 or welding some of the rebar 50 to the web 32, the studs 57 to the lower flange 33. May be installed. The stud 57 protrudes from the lower flange 33 to integrate the steel frame 30 and the concrete member 40. The stud 57 is preferably installed on the bottom surface of the lower flange 33, but may be installed on the web 32.

Stirrups 55 are installed at predetermined intervals along the longitudinal direction of the steel frame 30. Stirrup 55 is preferably installed to surround the lower flange 33 and the reinforcing bar (50). The stub 55 is embedded inside the concrete member 40 and is not exposed to the outside. Therefore, the problem caused by exposing the stirrup to the outside, that is, the worker falls over the stirrup, or the problem of insufficient space to step on the foot due to the stirrup can be solved.

8 is a perspective view illustrating a composite beam according to a second exemplary embodiment of the present invention, and FIG. 9 is a cross-sectional view taken along line CC ′ of FIG. 8.

Referring to the drawings, the composite beam 200 is a steel frame 30 having a '工' shape cross section, the concrete member 140 is installed coupled to the lower surface of the lower flange 33, and the concrete member 140 It includes a reinforcing bar 50 embedded therein, and a stub 55 installed to surround the reinforcing bar. On the other hand, the steel frame 30 is the same as the configuration of the steel frame 30 of the first embodiment will be omitted here. 8 and 9, the same reference numerals as those in FIGS. 5 to 7 denote the same components having the same function.

Concrete member 140 is installed on the lower surface of the lower flange 33 along the longitudinal direction of the steel frame (30). Accordingly, the web 32 and the upper flange 31 are exposed to the outside without being embedded in the concrete member 140. The width of the concrete member 140 is formed longer than the width of the lower flange 33.

It is preferable that the concrete member 140 does not extend to both ends of the steel frame 30 and extends only to a portion near the both ends. In addition, in order to integrate the concrete member 140 and the steel frame 30, it is preferable that a stud 57 is provided on the lower surface of the lower flange 33.

Reinforcing bar 50 is installed to be embedded in the concrete member 140 along the longitudinal direction of the steel frame (30). When the composite beam 200 is manufactured in a prestressed manner, the reinforcement bar 50 applies a compressive force to the concrete member 140.

Stirrups 55 are installed at predetermined intervals along the longitudinal direction of the steel frame 30. Stirrups 55 are preferably installed to surround the reinforcing bar (50). The stub 55 is embedded in the concrete member 140 and is not exposed to the outside.

10 is a perspective view illustrating a composite beam according to a third exemplary embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along line D-D 'of FIG. 10.

The composite beam 300 is a steel frame 30 having an 'industrial' shape, a concrete member 240 installed to be coupled to the lower surface of the lower flange 33, and reinforcement embedded in the concrete member 240. Reinforcing bar 50 and a stub (55) is installed to surround the reinforcing bar (50). The same reference numerals as those in FIGS. 5 to 9 among the reference numerals of FIGS. 10 and 11 denote the same components having the same functions. In addition, the composite beam 300 has the characteristic that the width W1 of the concrete member 240 is the same as the width W2 of the lower flange 33, compared to the composite beam 200 of the second embodiment. The remaining configuration is the same as the composite beam 200.

12 is an exploded perspective view illustrating a composite beam according to a fourth exemplary embodiment of the present invention, and FIG. 13 is a cross-sectional view illustrating the composite beam. 12 and 13, the same reference numerals as the reference numerals of FIGS. 1 to 11 denote the same components having the same function.

The composite beam 350 is a steel frame 30 having a cross section of an “industrial” shape, a concrete member 360, and a plate installed on an upper surface of the concrete member 360 and coupled to a lower surface of the lower flange 33 ( 370 and a reinforcing bar 50 embedded in the concrete member 360. Of the above components, the steel frame 30 and the reinforcing bar 50 are the same as the steel frame 30 and the reinforcing bar 50 of the above-described embodiment, so description thereof will be omitted herein.

The plate 370 is installed to be embedded in the upper surface of the concrete member 360, the upper surface of the plate 370 is exposed to the outside is coupled to the lower flange 33. The plate 370 may be made of steel, and thus the plate 370 may be welded to the lower surface of the lower flange 33 by welding. In addition to the plate 370, other plates herein may be made of steel.

A plurality of studs 57 may be installed on the bottom surface of the plate 370. The studs 57 increase the coupling force between the concrete member 360 and the plate 370.

The assembly of the plate 370 and the concrete member 360 and the steel frame 30 are manufactured, respectively, and then coupled by welding or the like. The assembly of the assembly and the steel frame 30 may be performed at a site or a factory.

The plate 370 is preferably formed to extend further outward (ie, pillar side) than the concrete member 360, in order to weld the plate 370 to the column.

On the other hand, recently, with the development of steelmaking technology, the strength of the plate 370 can be made larger than that of the steel frame 30. Thus, instead of the steel frame 30 having a cross section of the '工' shape, the steel frame having a cross section of the 'T' shape (30a in FIG. 14) may be used. That is, by making the strength of the plate 370 larger than that of the steel frame 30, the steel frame 30a having a 'T' shape without the lower flange 33 can be used, thereby reducing the manufacturing cost of the steel frame. to be. The combination of the steel frame 30a and the plate 370 may couple the lower end of the web 32 and the plate 370 by welding or the like.

In addition, as an alternative to the

steel frame

30, 30a, as shown in Figure 15, it is also possible to use a steel frame (30b) narrower than the upper flange 31 of the lower flange (33b). The combination of the steel frame 30b and the plate 370 may couple the lower surface of the lower flange 33b to the plate 370 by welding or the like.

16 is an exploded perspective view illustrating a composite beam according to a fifth embodiment of the present invention, and FIG. 17 is a cross-sectional view illustrating the composite beam. 16 and 17, the same reference numerals as those of Figs. 1 to 15 denote the same components having the same functions.

The composite beam 450 is a steel frame 30c having a '工' shape cross section, a concrete member 360, a plate installed on the upper surface of the concrete member 360 and coupled to the lower surface of the lower flange 33 ( 470, a reinforcing bar 50 embedded in the concrete member 360, and a stub 55a embedded in the concrete member 360. Among the components, since the concrete member 360 and the reinforcing bar 50 are the same as the concrete member 360 and the reinforcing bar 50 of the fourth embodiment, description thereof will be omitted herein. In addition, both ends of the steel frame 30c extends more than both ends of the concrete member 360 is the same as the above-described embodiment.

The plate 470 is installed to be embedded in the upper surface of the concrete member 360, the upper surface of the plate 470 is exposed to the outside. Although not shown in the drawings, a stud may be installed on the bottom surface of the plate 470.

The plate 470 is coupled to the bottom surface of the lower flange 33 by the stub 55a and the bolt 56. The plate 470 may be made of steel or the like. Accordingly, the bottom surface of the plate 470 and the lower flange 33 may be welded together with the bolt 56. The assembly of the plate 470 and the concrete member 360 and the steel frame 30c may be respectively manufactured and then combined at a site or a factory.

The plate 470 is preferably formed to extend further outward (ie, pillar side) than the concrete member 360, to weld the plate 470 to the column.

The stub 55a is installed at predetermined intervals along the longitudinal direction of the steel frame 30c. Both ends of the stirrup 55a pass through the through

holes

54 and 34, and are then fastened to the bolt 56. Therefore, the stub 55a serves to couple the steel frame 30c with the plate 470 and the concrete member 360.

Meanwhile, the composite beam 450 may use the steel frame 30b instead of the steel frame 30c, which will be easily understood by those skilled in the art with reference to the contents of the present specification.

Referring to the drawings, the composite beam 400 is a steel frame 30 having a 'engine' shaped cross section, the concrete member 340, the reinforcing steel bar 50 embedded in the interior of the concrete member 340, and The stub 55 is installed to surround the flange 33 and the reinforcing bar 50.

The composite beam 400 is the same as the composite beam 100 except that the concrete member 340 is not formed at the center of the steel frame 30 as compared with the composite beam 100 of the first embodiment. A cross-sectional view taken along line E-E 'of FIG. 12 is the same as that of FIG. 6, and the same reference numerals of FIGS. 5 to 7 in FIG. 18 denote the same components having the same function.

Concrete member 340 is installed along the longitudinal direction of the steel frame 30, it is not installed in the central portion of the steel frame (30). As is known, the bending moment is largely applied to the center of the beam and the shear force is largely applied to both ends of the beam. Since the concrete has a small resistance to the bending moment, the concrete does not have a concrete member 340 in the center of the beam. The concrete member 340 is installed only at both ends. Therefore, the composite beam 400 can reduce the amount of concrete used to lower the manufacturing cost of the composite beam 400, reduce the amount of CO ₂ generated, and improve the construction and reduce the logistics cost by reducing the weight of the composite beam 400 It has the feature that it can.

Referring to the drawings, the composite beam 500 is a steel frame 30 having a '工' shape, the concrete member 440, the reinforcing bar 50 embedded in the concrete member 440, and reinforcement The stub 55 is installed to surround the reinforcing bar 50.

The composite beam 500 is the same as the composite beam 200 except that the concrete member 440 is not formed at the center of the steel frame 30 as compared with the composite beam 200 of the second embodiment. 19 is the same as that of FIG. 9, and the same reference numerals as those of FIGS. 8 and 9 in FIG. 19 denote the same components having the same functions.

Referring to the drawings, the composite beam 600 is a steel frame 30 having a '工' shape cross section, the concrete member 540, the reinforcing bars 50 embedded in the concrete member 540, and reinforcement The stub 55 is installed to surround the reinforcing bar 50.

The composite beam 600 is the same as the composite beam 300 except that the concrete member 540 is not formed at the center of the steel frame 30 as compared with the composite beam 300 of the third embodiment. The cross-sectional view taken along line G-G 'of FIG. 20 is the same as that of FIG. 11, and the same reference numerals as those of FIGS. 10 and 11 in FIG.

21 is an exploded perspective view illustrating a composite beam according to a ninth embodiment of the present invention.

The composite beam 550 is a steel frame 30 having a 'engine' shaped cross section, a concrete member 380, a plate installed on the upper surface of the concrete member 380 and coupled to the lower surface of the lower flange 33 ( 375 and reinforcing bars 50 embedded in the concrete member 380. Of the above components, the steel frame 30 and the reinforcing bar 50 are the same as the steel frame 30 and the reinforcing bar 50 of the above-described embodiment, so description thereof will be omitted herein.

The composite beam 550 is the same as the composite beam 350 according to the fourth embodiment except that the concrete member 380 is not installed at the center and the concrete member 380 is installed only at both ends. Therefore, the cross section of both ends of the composite beam 550 is the same as FIG.

Meanwhile, instead of the steel frame 30, a steel frame having a 'T' shape cross section (30a of FIG. 14), or a steel frame 30b having a narrower width than the upper flange 31 may be used.

22 is an exploded perspective view showing a composite beam according to a tenth embodiment of the present invention. In FIG. 22, the same reference numerals as used in FIGS. 1 to 21 denote the same components having the same functions.

The composite beam 650 is a steel frame (30d) having a cross section of the '工' shape, the concrete member 380, the plate is installed on the upper surface of the concrete member 380 and coupled to the lower surface of the lower flange 33 ( 475, a reinforcing bar 50 embedded in the concrete member 380, and a stirrup 55a embedded in the concrete member 380.

Among the components, the rebar 50 and the stub 55a are the same as the rebar 50 and the stub 55a of the composite beam 450, respectively. The composite beam 650 is the same as the composite beam 450 according to the fifth embodiment except that the concrete member 380 is not installed at the center portion and the concrete member 380 is installed only at both ends. Therefore, the cross section of both ends of the composite beam 650 is the same as FIG.

Meanwhile, instead of the steel frame 30d, the steel frame 30b of which the width of the lower flange 33b is narrower than that of the upper flange 31 may be used.

FIG. 23 is a front view illustrating a composite beam coupled to a pillar according to an eleventh embodiment of the present invention, and FIG. 24 is a cross-sectional view taken along line H-H 'of FIG. In Fig. 23, the same reference numerals as those of Figs. 1 to 22 denote the same components having the same functions.

The composite beam 700 is a steel frame, the concrete member 380, the plate 376 is installed on the upper surface of the concrete member 380 and coupled to the lower end of the web 32 and the inside of the concrete member 380 Buried rebar 50 is included. Among the components, the concrete member 380 and the rebar 50 are the same as the concrete member 380 and the rebar 50 of the ninth embodiment, respectively.

Both ends of the steel frame is made of steel frame 30a having a 'T' shaped cross section, and the central portion of the steel frame is made of steel frame 30 having a cross section of an 'engine' shape. Connection coupling of the steel frame 30a and the steel frame 30 may be made by the connecting plate 38 and the bolt 39, or by welding the connecting plate 38 to the steel frame (30a) (30).

Plate 376 is welded to the bottom of web 32. The plate 376 is installed to be embedded in the upper surface of the concrete member 380, the upper surface of the plate 376 is exposed to the outside is coupled to the web 32.

The plate 376 is preferably formed to extend further to both sides than the end of the concrete member 380, which is a combination of the plate 376 and the pillar 20, and the combination of the plate 376 and the lower flange 33 For The plate 376 and the lower flange 33 may be joined by the connecting plate 38 and the bolt 39 or by welding the connecting plate 38.

In addition, the concrete member 380 preferably extends further toward the pillar 20 by a predetermined distance S than the concrete surface 27 of the pillar 20, more preferably the distance S is approximately 10 mm. .

The present invention has the following effects.

First, since the weight is small, the weight is easy to provide a composite beam is excellent in workability and the logistics cost such as transportation costs are reduced.

Second, because the concrete consumption is small, it provides an environment-friendly composite beam.

Third, it provides a composite beam easy to fasten with the pillar.

Fourth, it provides a composite beam to provide enough space for the operator to step on the slab work and eliminate the risk of injury to the operator.

Fifth, the present invention provides a composite beam capable of unifying the specifications of the deck plate used in slab work. This can increase the efficiency of slab casting and reduce the work time.

Sixth, a construction method using such a composite beam is provided.

Claims

Steel frame formed long in the longitudinal direction to constitute the entire length of the beam;

A concrete member for embedding a portion of the web of the steel frame and the lower flange therein;

Reinforcing bars embedded in the concrete member along the length direction; And

It is disposed at a predetermined interval along the longitudinal direction, the stub is installed to surround the lower flange and reinforcing steel of the steel frame; includes;

The upper flange of the steel frame is exposed to the outside without being embedded in the concrete member, the stirrup is embedded in the concrete member, characterized in that not exposed to the outside.
The method of claim 1,

The concrete member is not installed in the center of the steel frame composite beam, characterized in that it is installed only at both ends of the steel frame.
The method of claim 1,

A composite beam, characterized in that a stud is provided on the lower flange or web to increase the bonding force between the concrete member and the steel frame, or at least a part of the reinforcing bar is welded to the web and joined.
Steel frame formed long in the longitudinal direction to constitute the entire length of the beam;

A concrete member coupled to the bottom surface of the lower flange of the steel frame;

Reinforcing bars embedded in the concrete member along the length direction; And

It is disposed at a predetermined interval along the longitudinal direction, the stub is installed to surround the reinforcing steel;

The upper flange and the web of the steel frame is exposed to the outside without being embedded in the concrete member, the stub is embedded in the concrete member, characterized in that not exposed to the outside.
The method of claim 4, wherein

And the width w1 of the concrete member is equal to the width w2 of the lower flange.
The method of claim 4, wherein

The concrete member is not installed in the center of the steel frame composite beam, characterized in that it is installed only at both ends of the steel frame.
The method of claim 4, wherein

Composite beam, characterized in that the stud is installed on the lower surface of the lower flange to increase the bonding force with the concrete member.
Steel frame formed long in the longitudinal direction to constitute the entire length of the beam;

A plate whose upper surface is coupled to the lower end of the steel frame; And

It includes; a concrete member embedded with a plate so that the upper surface of the plate is exposed to the outside,

The steel frame is a composite beam, characterized in that exposed to the outside without being embedded in the concrete member.
The method of claim 8,

Steel frame is a composite beam characterized in that it has at least one of the cross section of the 'engine' shape, the cross section of the 'T' shape, the cross section of the lower flange narrower than the upper flange.
The method of claim 8,

It includes a stub installed to be embedded in the concrete member at a predetermined interval along the longitudinal direction,

The steel frame includes an upper flange, a lower flange, and a web connecting the upper flange and the lower flange,

The stirrup is characterized in that both ends of the plate and the lower flange penetrates the bolt and then joins the concrete member, the plate and the steel frame.
The method of claim 8,

The plate and the concrete member is installed only at both ends of the steel frame, the composite beam, characterized in that not installed in the center of the steel frame.
The method of claim 11,

Steel frame is a composite beam, characterized in that the central portion has a cross section of the 'engine' shape and both ends have a 'T' shape cross section.
The method of claim 12,

Steel and plate is a composite beam, characterized in that formed to extend more toward the pillar than the concrete member.
The method of claim 8,

And the concrete member is formed to extend further toward the column than the concrete surface of the column, and the steel frame and the plate are formed to extend more toward the column than the concrete member.
Installing a column; And

15. A method of constructing a composite beam, comprising: connecting the composite beam of any one of claims 1 to 14 to a column.
The method of claim 15,

Deck plate for constructing the slab is mounted on the upper flange of the composite beam, it is not mounted on the concrete member construction method of the composite beam.
The method of claim 15,

The compound beam is any one of the compound beam of claim 8,

After manufacturing the assembly of the plate and the concrete member and manufacturing the steel frame, the construction method of the composite beam characterized in that the assembly and the steel frame combined.
The method of claim 17,

The method of constructing a composite beam, characterized in that the concrete member extends further toward the column than the concrete surface of the column.