JP5750246B2 - Composite beam, building, and composite beam construction method - Google Patents

Description

  The present invention relates to a composite beam, a building, and a construction method for the composite beam.

  The composite beam of Patent Document 1 is used in a building in which a steel reinforced concrete floor is formed on the upper part of a steel beam covered with concrete. The thickness of the upper half of the steel frame web built in the beam is approximately the same. It is formed thinner than the wall thickness of the lower half, and the upper end of the beam is disposed in the in-situ reinforced concrete part formed at the upper part of the beam, and the upper part is a steel reinforced concrete beam.

  The composite beam of Patent Document 2 is a precast composite beam formed of precast concrete with a steel-concrete structure in which an H-shaped steel is disposed at the end of a joint portion with a column, and a central portion.

  The construction method of the composite beam of patent document 3 arrange | positions a formwork in the both sides of the web between the upper flange of a steel beam, and a lower flange, and connects in the formwork to the deck plate edge part supported by a steel beam. A through hole is provided, and when the floor concrete is placed, the concrete is placed in the formwork via the through hole provided at the end of the deck plate.

JP 04-261945 JP 2001-123534 A JP-A-10-102657

  An object of the present invention is to obtain a composite beam, a building, and a method for constructing a composite beam that can eliminate a small beam.

A composite beam according to claim 1 of the present invention includes an H-shaped steel beam, web concrete constructed on both sides of the web integrally with the lower flange at a distance from the upper flange of the beam, and an end portion. Reinforcing bars attached to the beam are arranged in the formed groove portions, precast slab concrete in which an end portion is constructed on the upper surface of the web concrete, between the web concrete and the upper flange , and the slab concrete the filled in the groove of having, a filler to flush the finished surface of the concrete slab and the upper surface of the top flange.

  According to the above configuration, after the web concrete is constructed on both sides of the web of the H-shaped steel beam, the end portion of the precast slab concrete is constructed on the upper surface of the web concrete. Then, a filler is filled between the web concrete and the upper flange of the beam to construct a composite beam. Since the constructed composite beam is made of precast slab concrete, for example, by setting the thickness of the slab concrete to a thickness that can withstand the load in advance, the slab concrete can withstand the load without a small beam. Thereby, if this composite beam is used in the construction of a building, the small beam can be eliminated.

A composite beam according to a second aspect of the present invention includes an H-shaped steel beam, web concrete constructed on both sides of a web integrally with a lower flange at a distance from the upper flange of the beam, and the web concrete. A precast slab concrete having an end portion erected on the upper surface thereof, and a filler filled between the web concrete and the upper flange, the upper surface of the upper flange and the finished surface of the slab concrete being flush with each other. A groove portion in which a reinforcing bar is arranged is formed at an end of the slab concrete, a through-hole through which the reinforcing bar can be inserted is formed in the web of the beam, and the reinforcing bar is inserted into the through-hole. At the same time, the slab concretes facing each other across the beam are connected. According to this structure, since several slab concrete is connected via a reinforcing bar, stress is transmitted to each slab concrete. Thereby, the load capacity of slab concrete can be raised.

In the composite beam according to a third aspect of the present invention, the web concrete is formed with a widened portion that widens outward from the end of the lower flange of the beam as viewed from the axial direction of the beam. According to this configuration, since the upper surface of the web concrete is wider than the lower surface, it is possible to secure a sufficient width for constructing the end portion of the slab concrete and to widen the filling port of the filler. it can.

  In the composite beam according to claim 4 of the present invention, prestress is introduced into the slab concrete. According to this configuration, since prestress is introduced into the slab concrete, it is possible to withstand the load even when the installation interval of the large beams is widened and the slab concrete has a large span.

  The building which concerns on Claim 5 of this invention is constructed | assembled with the composite beam and pillar of any one of Claims 1-4. According to this configuration, the use of synthetic beams in building construction can eliminate the small beams, so that the aesthetics of the building can be enhanced and the degree of freedom of equipment arrangement can be increased.

According to a sixth aspect of the present invention, there is provided a method for constructing a composite beam, the step of constructing web concrete on both sides of a web integrally with the lower flange with a gap from the upper flange of the H-shaped steel beam, and the web concrete. A step of laying the beam constructed to the column, a step of laying an end portion of the precast slab concrete having a groove portion on the web concrete, a reinforcing bar is arranged in the groove portion, and the reinforcing bar is attached to the beam. after mounting, the between the upper flange of said web concrete and the beam, and a step of flush upper surface with finished surface of the concrete slab of the top flange is filled with a filler in the groove Have.

  According to the above configuration, since the constructed composite beam is made of precast slab concrete, for example, by setting the thickness of the slab concrete to a thickness that can withstand the load in advance, it can withstand the load even without a small beam. be able to. Thereby, if this composite beam is used in the construction of a building, the small beam can be eliminated.

  Since the present invention has the above-described configuration, the small beam can be eliminated.

It is a top view of the building concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view of the composite beam which concerns on 1st Embodiment of this invention. It is a construction process figure of the composite beam concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view of the modification of the composite beam which concerns on 1st Embodiment of this invention. It is a longitudinal cross-sectional view of the composite beam which concerns on 2nd Embodiment of this invention. It is a construction process figure of a composite beam concerning a 2nd embodiment of the present invention. It is a longitudinal cross-sectional view of the composite beam which concerns on 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the composite beam which concerns on 4th Embodiment of this invention.

  1st Embodiment of the construction method of the composite beam of this invention, a building, and a composite beam is described based on drawing.

  FIG. 1 is a plan view showing one level of a building 10 as an example of a building constructed on the ground (not shown). The building 10 is erected on a plurality of pillars 12 erected at intervals in an arrow X direction (right direction in the figure) and an arrow Y direction (upward direction in the figure), and two pillars 12 in the arrow X direction. And a composite beam 20 installed on the plurality of columns 12.

  FIG. 2A shows a cross-sectional view (XZ plane) of the composite beam 20 with the vertical direction orthogonal to the arrow X direction as the arrow Z direction. The composite beam 20 includes an H-shaped steel beam 22, a web concrete 34 built on the beam 22, a slab concrete 16 having an end erected on the upper surface of the web concrete 34, and between the web concrete 34 and the upper flange 24. And a filling material 30 filled in. In FIG. 2A, the members are arranged symmetrically with the beam 22 as the center.

  The beam 22 is an H-shaped steel having an upper flange 24, a lower flange 26, and a web 28, and both ends in the longitudinal direction are connected to the columns 12. The web concrete 34 is constructed on both sides of the web 28 integrally with the lower flange 26 at a distance from the upper flange 24. Further, the web concrete 34 is formed with a widened portion 34 </ b> A that widens from the end portion of the lower flange 26 in the arrow Z direction to the outside with a width W as viewed from the axial direction of the beam 22.

  A stud 36 having a length direction in the arrow Z direction is joined to the lower surface of the upper flange 24 and the upper surface of the lower flange 26. A welding wire mesh 32 for reinforcing the composite beam 20 is attached to the stud 36 with a binding wire (not shown). Reinforcing bars 38 as a plurality of reinforcing bars are provided from the slab concrete 16 toward the stud 36 on the lower surface of the upper flange 24. One end portion of the reinforcing bar 38 is bent in a U shape at the lower side of the upper flange 24 to form a bent portion 38A. In FIG. 2A, illustration of other studs joined to the web 28 and main bars provided in a direction intersecting with the reinforcing bars 38 is omitted.

  As shown in FIG. 2B, the slab concrete 16 is a precast material, and a groove portion 42 in which a reinforcing bar 38 (see FIG. 2A) is arranged is formed. The groove 42 has a shape opened to the end surface 16A and the upper surface 16B of the slab concrete 16 with the arrow X direction as a longitudinal direction, and an inclined surface 42A is formed on the side opposite to the end surface 16A. The slab concrete 16 has a plurality of through holes 44 formed along the arrow X direction for the purpose of weight reduction. In addition, although the prestress is introduced into the slab concrete 16 using PC steel wire, illustration of PC steel wire is abbreviate | omitted.

  As shown in FIG. 2A, for example, the filler 30 is composed of high-fluid mortar, and is filled between the web concrete 34 and the upper flange 24 through the slab concrete 16 and the upper flange 24. The upper surface of the upper flange 24 and the finished surface of the slab concrete 16 are the same surface.

  Next, the construction method of the composite beam 20 and the building 10 will be described.

  As shown in FIG. 3A, studs 36 are joined to the lower surface of the upper flange 24 and the upper surface of the lower flange 26 in the beam 22. Then, the welded wire mesh 32 is disposed outside the stud 36 with respect to the web 28, and is tightly attached to the stud 36. Further, a mold frame (not shown) is arranged outside the welded wire mesh 32, and concrete is placed in the mold frame. Thereby, the web concrete 34 is constructed on both sides of the web 28. The beam 22 on which the web concrete 34 is constructed in this way is laid on the column 12 (see FIG. 1).

  The height of the formwork for constructing the web concrete 34 is such that the distance Δh from the upper surface of the web concrete 34 to the upper surface of the upper flange 24 when completed is the set thickness of the slab concrete 16 (see FIG. 2A). It is preset so as to be equal to this. Moreover, this formwork is inclinedly arranged so that the width | variety of the arrow X direction of the web concrete 34 spreads so that the arrow Z direction upper direction.

  On the other hand, the PC steel wire is placed on the molding table and strained, and concrete is cast and the through hole and the groove part 42 are molded and cured, so that the groove part 42 and the through hole 44 (see FIG. 2B). ) Slab concrete 16 is formed. For the main bars, the illustration and the description of the bar arrangement process are omitted.

  Subsequently, as shown in FIG. 3B, the slab concrete 16 is installed by placing each end of the slab concrete 16 on the widened portion 34 </ b> A of the web concrete 34. Then, the reinforcing bar 38 having the bent portion 38A formed in advance at the end portion is inserted into the groove portion 42, and the bent portion 38A is disposed below the upper flange 24. In this state, the stud 36 and the reinforcing bar 38 are bound by a binding wire (not shown). It should be noted that half the overall width of the upper flange 24 is Δd2, and the end of the reinforcing bar 38 is only on the lower side of the upper flange 24 within a range of 2/3 or more of the width Δd2 from the end face of the upper flange 24. It is arranged so that it is included.

  Subsequently, as shown in FIG. 3C, the filler 30 is filled between the web concrete 34 and the upper flange 24 of the beam 22 so that the upper surface of the upper flange 24 to the finished surface of the slab concrete 16 are the same. The upper surface of the filler 30 is leveled so that it becomes a surface. The composite beam 20 and the building 10 are constructed by these construction processes. The groove portion 42 is also filled with the filler 30.

  Next, the operation of the first embodiment of the present invention will be described.

  As shown in FIG. 3C, since the constructed composite beam 20 is made of precast slab concrete 16, for example, the thickness of the slab concrete 16 is set to a thickness that can withstand the load in advance. Even if there is not, it can endure the load which acts on the slab concrete 16. FIG. Thereby, a small beam can be eliminated in the construction of the building 10. Further, in the composite beam 20 of the present embodiment, since prestress is introduced to the slab concrete 16 by PC steel wire (not shown), even if the installation interval of the beams 22 is widened and the slab concrete 16 has a large span. The load acting on the slab concrete 16 can be withstood.

  Moreover, in the composite beam 20, since the upper surface of the web concrete 34 is expanded compared with the lower surface, and the widened part 34A is formed, the width | variety which constructs the edge part of the slab concrete 16 can fully be ensured. Furthermore, in the composite beam 20, the presence of the widened portion 34 </ b> A increases the opening width Δd <b> 1 (see FIG. 3B) of the filling port 25 for filling the filler 30 compared to the configuration without the widened portion 34 </ b> A. Therefore, the filling property of the filler 30 can be improved. Moreover, since the small beam can be eliminated as the building 10 by using the composite beam 20, the aesthetic appearance of the building 10 can be enhanced and the degree of freedom of equipment arrangement can be increased.

  As a modification of the composite beam 20 of the first embodiment, a straight bar 46 shown in FIG. 4 may be used instead of the reinforcing bar 38 having the bent portion 38A shown in FIG. Similar to the configuration using the reinforcing bar 38, the end of the straight bar 46 is disposed so as to be indented only below the upper flange 24 within a range of 2/3 or more of the width Δd2 from the end face of the upper flange 24. Is done.

  Next, 2nd Embodiment of the construction method of the composite beam of this invention, a building, and a composite beam is described based on drawing. Note that the same reference numerals as those in the first embodiment are given to the members that are basically the same as those in the first embodiment described above, and the description thereof is omitted.

  FIG. 5 shows a cross-sectional view (XZ plane) of the composite beam 50 of the second embodiment. The composite beam 50 includes an H-shaped steel beam 52, a web concrete 34 constructed on the beam 52, a slab concrete 16 having an end portion erected on the upper surface of the web concrete 34, and a reinforcing bar connecting the plurality of slab concrete 16. 62 and a filler 30 filled between the web concrete 34 and the upper flange 54. In FIG. 5, the members are arranged symmetrically about the beam 52. In addition, as the reinforcing bar 62, a straight bar is used as an example.

  The beam 52 is an H-shaped steel having an upper flange 54, a lower flange 56, and a web 58, and both ends in the longitudinal direction are connected to the columns 12 (see FIG. 1). The upper flange 54 is formed with a plurality of air holes 52A penetrating in the arrow Z direction, and the web 58 is formed with a through hole 52B having a size penetrating in the arrow X direction and allowing the reinforcing bar 62 to be inserted therethrough. ing. Further, the slab concrete 16 disposed opposite to each other with the beam 52 interposed therebetween is connected by a reinforcing bar 62 having an end portion disposed in the groove portion 42.

  The web concrete 34 is constructed on both sides of the web 58 integrally with the lower flange 56 at a distance from the upper flange 54. Further, a stud 36 whose length direction is the arrow Z direction is joined to the lower surface of the upper flange 54 and the upper surface of the lower flange 56, and the welding wire mesh 32 is attached to the stud 36 with a binding wire (not shown). It has been.

  Next, the construction method of the composite beam 50 will be described.

  As shown in FIG. 6A, the stud 36 is joined to the lower surface of the upper flange 54 and the upper surface of the lower flange 56 in the beam 52. Then, the welded wire mesh 32 is disposed outside the stud 36 with respect to the web 58, and is tightly attached to the stud 36. Further, a mold frame (not shown) is arranged outside the welded wire mesh 32, and concrete is placed in the mold frame. Thereby, the web concrete 34 is constructed on both sides of the web 58. The beam 52 on which the web concrete 34 is constructed in this way is laid on the pillar 12 (see FIG. 1).

  The height of the mold for constructing the web concrete 34 is such that the distance Δh from the upper surface of the web concrete 34 to the upper surface of the upper flange 54 at the time of completion is equal to the set thickness of the slab concrete 16 (see FIG. 5). It is preset so that Moreover, this formwork is inclinedly arranged so that the width | variety of the arrow X direction of the web concrete 34 spreads so that the arrow Z direction upper direction.

  Subsequently, as shown in FIG. 6B, the slab concrete 16 is constructed by placing each end of the slab concrete 16 on the widened portion 34 </ b> A of the web concrete 34. Then, one end of the reinforcing bar 62 is inserted into the groove portion 42 of the slab concrete 16 on one side (the left side in the drawing) and through the through hole 52B, and is inserted into the groove portion 42 of the slab concrete 16 on the other side (the right side in the drawing). In this state, the stud 36 and the reinforcing bar 62 are bound by a binding wire (not shown).

  Subsequently, as shown in FIG. 6C, the filler 30 is filled between the web concrete 34 and the upper flange 54 of the beam 52, and the upper surface of the upper flange 54 to the finished surface of the slab concrete 16 are the same. The upper surface of the filler 30 is leveled so that it becomes a surface. Through these construction steps, the composite beam 50 and the building 10 having the composite beam 50 are constructed. Note that when filling the filler 30, air escapes from the air holes 52 </ b> A of the upper flange 54, so that it is difficult to collect air between the beam 52 and the filler 30. Further, the filler 30 is also filled in the groove 42.

  Next, the operation of the second embodiment of the present invention will be described.

  As shown in FIG. 5, since the constructed composite beam 50 has a plurality of slab concretes 16 connected to each other via reinforcing bars 62, the bending stress acting on the slab concrete 16 is transmitted to the other slab concretes 16. The Thereby, the load capacity of the slab concrete 16 can be increased and the small beam can be eliminated.

  Next, 3rd Embodiment of the construction method of the composite beam of this invention, a building, and a composite beam is described based on drawing. Note that the same reference numerals as those in the first and second embodiments are given to the same members as those in the first and second embodiments described above, and the description thereof is omitted.

  FIG. 7 shows a cross-sectional view (XZ plane) of the composite beam 70 of the third embodiment. The composite beam 70 is cast in-situ on the upper side of the beam 52, the web concrete 34 constructed on the beam 52, the half precast slab concrete 72 having an end erected on the upper surface of the web concrete 34, and the slab concrete 72. The top concrete 74 and the reinforcing bar 76 provided in the top concrete 74 are included. In FIG. 7, the members are arranged symmetrically about the beam 52. The top concrete 74 is an example of a filler.

  Both ends of the beam 52 in the longitudinal direction are connected to the pillar 12 (see FIG. 1), and a reinforcing bar 76 is inserted into a through hole 52 </ b> B formed in the web 58. The top concrete 74 is placed on the upper side of the slab concrete 72 and is filled between the web concrete 34 and the upper flange 54, and is leveled so that the finished surface is flush with the upper surface of the upper flange 54. Yes. The leveling of the concrete surface does not mean placing concrete up to a preset height on the upper surface of the upper flange 54, but placing concrete while matching the height of the upper surface of the upper flange 54. For example, when the upper flange 54 is in a bent state in which the central portion is lower than the end portion, the upper surface of the top concrete 74 is aligned with the upper surface of the upper flange 54 so that the central portion is lower than the end portion. Means leveling.

  The slab concrete 72 is a half precast material, and has a set height Δh / 2 with respect to a distance Δh from the upper surface of the web concrete 34 to the upper surface of the upper flange 54 at the time of completion (the height of the top concrete 74). Is Δh / 2). The slab concrete 72 has a plurality of through holes (not shown) for weight reduction, and prestress is introduced using a PC steel wire (not shown).

  Next, the construction method of the composite beam 70 will be described.

  In the beam 52, the stud 36 is joined to the lower surface of the upper flange 54 and the upper surface of the lower flange 56. Then, the welded wire mesh 32 is disposed outside the stud 36 with respect to the web 58, and is tightly attached to the stud 36. Further, a mold frame (not shown) is arranged outside the welded wire mesh 32, and concrete is placed in the mold frame. Thereby, the web concrete 34 is constructed on both sides of the web 58. The beam 52 on which the web concrete 34 is constructed in this way is laid on the pillar 12 (see FIG. 1).

  Subsequently, the slab concrete 72 is constructed by placing each end of the slab concrete 72 on the widened portion 34 </ b> A of the web concrete 34. Then, the reinforcing bar 76 is inserted into the through hole 52B and disposed on the slab concrete 72 on both sides of the beam 52, and the stud 36 and the reinforcing bar 76 are bound by a binding wire (not shown).

  Subsequently, the concrete is placed on the slab concrete 72 to construct the top concrete 74, and the concrete is filled between the web concrete 34 and the upper flange 54 of the beam 52, and the top concrete is started from the upper surface of the upper flange 54. Up to 74 finished surfaces are the same surface. Through these construction steps, the composite beam 70 and the building 10 having the composite beam 70 are constructed.

  Next, the operation of the third embodiment of the present invention will be described.

  As shown in FIG. 7, the constructed composite beam 70 withstands the load acting on the slab concrete 72 due to the prestress introduced into the slab concrete 72. Furthermore, since the plurality of top concretes 74 are connected via the reinforcing bars 76, the bending stress acting on the top concrete 74 is transmitted to each other top concrete 74. Thereby, the load resistance of the slab concrete 72 and the top concrete 74 can be raised, and a small beam can be eliminated. In addition, since the slab concrete 72 is made of half precast, the weight is lighter than that of full precast, making it easy to carry in to the site and making it easier to install.

  Next, 4th Embodiment of the construction method of the composite beam of this invention, a building, and a composite beam is described based on drawing. The same reference numerals as those in the first to third embodiments are given to the basically same members as those in the first to third embodiments, and the description thereof is omitted.

  FIG. 8 shows a cross-sectional view (XZ plane) of the composite beam 80 of the fourth embodiment. The composite beam 80 connects the beam 52, the web concrete 34 built on the beam 52, the slab concrete 82 having an end portion erected on the upper surface of the web concrete 34, and the plurality of slab concrete 82 inserted through the through holes 52B. The reinforcing bar 88 and the filler 30 filled between the web concrete 34 and the upper flange 54 are configured. In FIG. 8, the members are arranged symmetrically about the beam 52.

  The slab concrete 82 is a precast material, and has a groove 82A in which the reinforcing bars 88 are arranged. The groove 82A has a shape opened on the end surface and the upper surface of the slab concrete 82 with the arrow X direction as the longitudinal direction, and an inclined surface is formed on the side opposite to the end surface. Further, a sheath tube 84 is provided along the direction of the arrow X at the lower part of the slab concrete 82, and a PC steel wire 86 is inserted into the sheath tube 84. Both ends of the PC steel wire 86 are fixed by a fixing tool 87 in a state in which the PC steel wire 86 is previously tensioned by a jack (not shown), so that prestress is introduced into the slab concrete 82.

  Next, the construction method of the composite beam 80 will be described.

  The beam 52 on which the web concrete 34 is constructed is installed on the column 12 (see FIG. 1). Subsequently, the slab concrete 82 is installed by placing each end of the slab concrete 82 on the widened portion 34 </ b> A of the web concrete 34. Then, one end of the reinforcing bar 88 is inserted into the groove portion 82A of the slab concrete 82 on one side (left side in the drawing) and through the through hole 52B, and is inserted into the groove portion 82A of the slab concrete 82 on the other side (right side in the drawing). In this state, the stud 36 and the reinforcing bar 88 are bound by a binding wire (not shown).

  Subsequently, the filler 30 is filled between the web concrete 34 and the upper flange 54 of the beam 52 so that the upper surface of the filler 30 is the same surface from the upper surface of the upper flange 54 to the finished surface of the slab concrete 82. Level. Through these construction steps, the composite beam 80 and the building 10 having the composite beam 80 are constructed.

  Next, the operation of the fourth exemplary embodiment of the present invention will be described.

  As shown in FIG. 8, the constructed composite beam 80 withstands the load acting on the slab concrete 82 due to the prestress introduced into the slab concrete 82. Further, since the plurality of slab concretes 82 are connected via the reinforcing bars 88, the bending stress acting on the slab concrete 82 is transmitted to the other slab concretes 82. Thereby, the load-bearing amount of the slab concrete 82 can be raised and a small beam can be eliminated.

  In addition, this invention is not limited to said embodiment.

  The web concrete 34 is not limited to the inverted trapezoidal shape and has the widened portion 34A. For example, the web concrete 34 may have a rectangular cross section by expanding the width of the lower flange 26 with respect to the upper flange 24. Good.

10 Building (Building)
12 Column 16 Slab concrete 20 Composite beam 22 Beam 24 Upper flange 26 Lower flange 28 Web 30 Filler 34 Web concrete 34A Widened portion 42 Groove portion 50 Composite beam 52 Beam 52B Through hole 54 Upper flange 56 Lower flange 58 Web 62 Reinforcement 70 Composite beam 72 Slab concrete 74 Top concrete (filler)
80 Composite beam 82 Slab concrete 88 Reinforcing bar

Claims (6)

H-beams and
A web concrete constructed on both sides of the web integrally with the lower flange, spaced from the upper flange of the beam;
Reinforcing bars attached to the beam are arranged in the groove formed in the end, and precast slab concrete in which the end is constructed on the upper surface of the web concrete;
Filling material between the web concrete and the upper flange, and in the groove portion of the slab concrete, the upper surface of the upper flange and the finished surface of the slab concrete being the same surface,
Composite beam with H-beams and
A web concrete constructed on both sides of the web integrally with the lower flange, spaced from the upper flange of the beam;
Precast slab concrete with an end erected on the upper surface of the web concrete;
A filler filled between the web concrete and the upper flange, the upper surface of the upper flange and the finished surface of the slab concrete being the same surface;
Have
At the end of the slab concrete is formed a groove where reinforcing bars are laid,
A through-hole through which the reinforcing bar can be inserted is formed in the web of the beam,
A composite beam in which the reinforcing bar is inserted through the through-hole and connects the slab concrete that is opposed to the beam.   The composite beam according to claim 1 or 2, wherein the web concrete is formed with a widened portion that widens outward from an end portion of a lower flange of the beam when viewed from the axial direction of the beam.   The composite beam according to any one of claims 1 to 3, wherein prestress is introduced into the slab concrete.   A building constructed with the composite beam and column according to any one of claims 1 to 4. Constructing web concrete on both sides of the web integrally with the lower flange, spaced from the upper flange of the H-beam,
Laying the beam on which the web concrete is constructed to a column;
Laying an end of the precast slab concrete having a groove on the web concrete;
After attaching the reinforcing bar by Haisuji reinforcing bars to said groove in the beam, between the upper flange of said web concrete and the beam, and the upper surface of the top flange is filled with a filler in the groove the A process of making the finished surface of the slab concrete the same surface;
A method of constructing a composite beam having

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