JP5406563B2 - 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.

  Conventionally, synthetic beams are used in buildings. The composite beam is formed by placing concrete around a steel beam made of H-shaped steel or the like, and increases the strength of the beam and suppresses deterioration of the strength of the steel beam at the time of fire.

  As an example of a composite beam, when forming a frame on both sides of the web between the upper and lower flanges of H-shaped steel, placing a deck plate on the upper flange, and placing concrete on the deck plate There is also one in which concrete is placed in a mold and a beam and a slab are integrally constructed (see, for example, Patent Documents 1 and 2).

  In the composite beam of Patent Document 1, a through hole is formed at the end of the deck plate, and when concrete is placed on the deck plate, a part of the concrete passes through the through hole of the deck plate and enters the web formwork. To flow into.

  In the composite beam of Patent Document 2, a through hole is formed in the upper flange of the H-shaped steel, and when concrete is placed on the deck plate, a part of the concrete passes through the through hole of the upper flange to form a web mold. It flows into the frame.

  As described above, in the composite beams of Patent Documents 1 and 2, the upper surface of the slab is above the upper surface of the upper flange of the H-shaped steel, and the upper surface of the slab and the upper flange are not the same surface.

JP-A-10-102657 JP 10-102658 A

  The present invention relates to a composite beam, a building, and a composite beam for improving the filling property of concrete when filling the web with concrete when the slab upper surface is flush with the upper surface of the upper flange of the H-shaped steel. The purpose is to obtain a method.

The composite beam according to claim 1 of the present invention includes an H-shaped steel, a first stud bonded to the lower surface of the upper flange of the H-shaped steel, and a second stud bonded to both surfaces of the H-shaped steel web. And a corrugated deck plate mounted on the H- beam, a corrugated deck plate placed on the beam and having a valley at the end disposed below the upper flange of the H- beam, and concrete The second stud is embedded in the concrete by being installed or precast, and the concrete is constructed on both sides of the H-shaped steel web, and placed on the deck plate, and the upper surface is the H-shaped. And slab concrete that is flush with the upper surface of the upper flange of the steel and integrated with the web concrete and the first stud.

  According to the said structure, the edge part of a corrugated deck plate is a trough part, and this trough part is arrange | positioned under the upper side flange of H-section steel. For this reason, the peak part of a deck plate is not arrange | positioned under the upper side flange of H-section steel. In this way, the distance between the upper flange of the H-section steel and the deck plate is larger than the distance between the upper flange of the H-section steel and the top surface of the peak portion of the deck plate, that is, when the web is filled with concrete. Since the filling port is wide, the filling property of concrete is improved.

  In addition, since there is a small beam, a vertical load acting on the slab concrete is transmitted from the deck plate to the H-shaped steel via the small beam and resisted. For this reason, for example, when providing reinforcing bars in slab concrete, even if the reinforcing bars cannot be continued between the slab concretes due to the presence of the H-shaped steel web, the vertical load acting on the slab concrete can be prevented. Strength is improved.

  The composite beam which concerns on Claim 2 of this invention has the reinforcing bar arrange | positioned in the length direction of the said H-section steel along the said 1st stud on the said web side of the said 1st stud. According to this structure, since there is a reinforcing bar at the place where the first stud is not present in the length direction of the H-section steel, the fixing property of the concrete is improved.

  In the composite beam according to claim 3 of the present invention, an end portion of the slab concrete distribution bar arranged in a direction intersecting the length direction of the H-shaped steel is a U-shaped hook, The hook, the first stud, and the reinforcing bar are bound together. According to this configuration, the U-shaped hooks of the slab concrete distribution bars are hung on the concrete and are difficult to come off, so that the fixing ability of the distribution bars is improved.

  In a building according to claim 4 of the present invention, the composite beam according to any one of claims 1 to 3 is connected to a column. According to this structure, since the concrete filling property of a composite beam improves, construction of a building becomes easy.

According to a fifth aspect of the present invention, there is provided a composite beam construction method in which an H-shaped steel having studs bonded to both the lower surface of the upper flange and the both surfaces of the web is installed, and the end of the small beam is joined to the H-shaped steel web. A corrugated deck plate is placed on the beam, and a trough at the end of the deck plate is disposed below the upper flange, and a reinforcing bar is disposed on the web side of the stud on the lower surface of the upper flange. , A power distribution bar having a U-shaped hook is disposed on the upper side of the deck plate, the U-shaped hook is disposed on the lower side of the upper flange, the stud on the lower surface of the upper flange, the reinforcing bar, and the A U-shaped hook is bound, and a mold is attached to both sides of the H-shaped steel web from the tip of the lower flange of the H-shaped steel to the lower surface of the deck plate, and between the upper flange and the deck plate. Said type When placing concrete between the web and the slab concrete on the deck plate, the upper surface of the upper flange of the H-shaped steel and the upper surface of the slab concrete are flush with each other, Level the concrete surface.

  According to the above configuration, even if the beam of the H-shaped steel is bent, the upper surface of the slab concrete is leveled according to the bending, so that a step is generated between the upper surface of the upper flange of the H-shaped steel and the upper surface of the slab concrete. Can be suppressed.

  Since this invention set it as the said structure, when the slab upper surface is made into the same surface as the upper surface of the upper flange of H-shaped steel, the filling property of concrete when filling concrete with a web improves.

It is a top view of the composite beam of the building concerning a 1st embodiment of the present invention. It is a perspective view which shows the arrangement | positioning state of each member of the composite beam which concerns on 1st Embodiment of this invention. (A), (b) It is sectional drawing in the position with and without the position of the small beam of the composite beam which concerns on 1st Embodiment of this invention. (A), (b) It is sectional drawing which shows the state before concrete placement in the position without a small beam of the composite beam which concerns on 1st Embodiment of this invention, and a position with it. (A), (b) It is sectional drawing in the position with and without the position of the small beam of the composite beam which concerns on 2nd Embodiment of this invention. (A), (b) It is sectional drawing which shows the state before concrete placement in the position without a small beam of the composite beam which concerns on 2nd Embodiment of this invention, and a position.

  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 a building constructed on the ground (not shown). The building 10 includes a plurality of columns 12 and a beam slab structure 20. The beam slab structure 20 includes a composite beam 14 erected on the column 12, a small beam 16 having an H-shaped steel erected on the composite beam 14, and a concrete cast on the upper side of the small beam 16. And a slab 18 extending in the same plane.

  3A and 3B are sectional views of the beam slab structure 20. 3A is a cross-sectional view at a position where the small beam 16 of the composite beam 14 is not provided, and FIG. 3B is a position at which the small beam 16 of the composite beam 14 is provided. It is a sectional view.

  As shown in FIG. 3A, the composite beam 14 has an H-shaped steel 22. The H-shaped steel 22 includes an upper flange 24, a lower flange 26, and a web 28, and a first stud 30 having a vertical direction as a length direction is joined to the lower surface of the upper flange 24.

  Here, assuming that the distance from the end face of the upper flange 24 to the axial center of the first stud 30 is L1, the distance L1 = 4 cm. The distance L1 = 4 cm is a minimum value defined by various synthetic structure design guidelines. The distance L2 is the distance from the web 28 to the axis of the first stud 30 (ft roller dimension). Further, on the web 28 side of the first stud 30, a reinforcing bar 34 is disposed along the length of the H-shaped steel 22 along the first stud 30, and the reinforcing bar 34 is connected to the first stud 30 with a binding wire 35. They are united.

  Moreover, the 2nd stud 32 which makes a length direction a substantially horizontal direction is joined to both surfaces of the web 28. As shown in FIG. A reinforcing bar 36 for reinforcing the composite beam 14 is attached to the second stud 32 with a binding line (not shown).

  On the other hand, as shown in FIG. 3B, a gusset plate 38 having a joint surface 38 </ b> A protruding toward the small beam 16 is disposed at a portion corresponding to the end portion of the small beam 16 of the H-shaped steel 22. ing. Here, the end portion of the small beam 16 is joined to the joining surface 38 </ b> A of the gusset plate 38 by the bolt 40.

  Next, as shown in FIGS. 2 and 3 (a) and 3 (b), the other end of the corrugated deck plate 42 in which a crest 42A and a trough 42B are continuously formed on the upper surface of the beam 16 Is placed. In the deck plate 42, one end 42 </ b> C that is not placed on the beam 16 is a flat surface (valley). A deck adjustment plate 44 is disposed below the end portion 42C of the deck plate 42.

  As shown in FIGS. 3A and 3B, on the upper side of the deck plate 42, distribution bars 46 are arranged in a direction intersecting with the length direction of the H-section steel 22. A main bar 48 is disposed along the length direction of the H-section steel 22 so as to intersect with the distribution bar 46. The end of the distribution bar 46 is a bent portion 46A bent along the web 28, and the distribution bar 46, the first stud 30, and the reinforcing bar 34 are bound by a binding wire 35.

  Here, the concrete is cast on both surfaces of the web 28 of the H-shaped steel 22 so that the first stud 30 and the second stud 32 are embedded therein, and the web concrete 50 is formed. The web concrete 50 is prevented from falling by the second studs 32 and the reinforcing bars 36 on both sides of the web 28.

  Further, concrete is placed on the deck plate 42 so as to be flush with the upper surface of the upper flange 24 of the H-shaped steel 22, thereby forming slab concrete 52. Here, the web concrete 50 and the slab concrete 52 are united. In addition, although concrete is cast also in the H-section steel of the small beam 16, illustration is abbreviate | omitted.

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

  As shown in FIG. 4A, the first stud 30 is joined to the lower surface of the upper flange 24 of the H-section steel 22, and the second stud 32 is joined to both surfaces of the web 28. Then, the reinforcing bar 36 is attached in the vicinity of the second stud 32. The H-section steel 22 is previously provided with a gusset plate 38 (see FIG. 4B) by welding.

  Subsequently, as shown in FIG. 4B, the H-section steel 22 is bridged between the columns 12 (see FIG. 1), and the distance from the upper surface of the upper flange 24 to the upper surface of the small beam 16 is slab concrete 52. The small beams 16 are arranged so as to be equal to the set thickness (see FIG. 3). Then, the end portion of the small beam 16 and the H-shaped steel 22 are joined by the gusset plate 38 and the bolt 40.

  Subsequently, the deck plate 42 is placed on the upper surface of the small beam 16. At this time, the end portion 42 </ b> C of the deck plate 42 is disposed below the end portion of the upper flange 24. A reinforcing bar 34 is disposed on the web 28 side of the first stud 30. Further, the deck plate 42 is fixed to the upper surface of the small beam 16 by spot welding.

  Subsequently, as shown in FIGS. 4A and 4B, the reinforcing bars 46 and the main bars 48 are arranged above the deck plate 42. At this time, the bent portion 46 </ b> A of the distribution bar 46 is disposed below the upper flange 24 beyond the reinforcing bar 34. Then, the first stud 30, the reinforcing bar 34, and the distribution bar 46 are bound by a binding wire 35.

  Subsequently, on both sides of the web 28 of the H-section steel 22, the formwork 54 is attached in the vertical direction from the tip of the lower flange 26 of the H-section steel 22 to a height corresponding to the lower surface of the deck plate 42. Then, the deck adjusting plate 44 is disposed on the upper surface of the mold 54, and concrete is driven between the upper flange 24, the deck adjusting plate 44 and the end 42 </ b> C of the deck plate 42, and between the mold 54 and the web 28. And concrete is placed on the deck plate 42.

  Here, the end portion 42 </ b> C of the deck plate 42 is a valley portion, and is overlapped with the deck adjustment plate 44 below the upper flange 24 to form a flat plate shape. 42A is not arranged. As a result, the distance A between the lower surface of the upper flange 24 and the upper surface of the deck adjusting plate 44 is larger than the distance B between the lower surface of the upper flange 24 and the upper surface 42A of the deck plate 42, that is, the web 28 is made of concrete. The filling port when filling is widened and the filling property of concrete is improved.

  On the other hand, when placing concrete on the deck plate 42, the concrete surface is leveled so that the upper surface of the upper flange 24 of the H-section steel 22 and the upper surface of the slab concrete 52 (see FIG. 3) are flush with each other. . The leveling of the concrete surface does not mean placing the concrete up to a preset height on the upper surface of the upper flange 24, but means placing the concrete in accordance with the height of the upper surface of the upper flange 24. For example, when the upper flange 24 is in a bent state in which the central portion is lower than the end portion, the upper surface of the slab concrete 52 is aligned with the upper surface of the upper flange 24 so that the central portion is lower than the end portion. Means leveling.

  Through the above construction process, the beam slab structure 20 and the building 10 are constructed as shown in FIGS. 1 to 3A and 3B.

  Here, due to the presence of the small beam 16, the vertical load acting on the slab concrete 52 (see FIG. 3) is transmitted from the deck plate 42 to the H-section steel 22 via the small beam 16. . Thereby, even when the force distribution reinforcement 46 cannot be continued between each slab concrete 52 by the web 28 of the H-section steel 22, the proof strength with respect to the vertical load which acts on the slab concrete 52 can be improved.

  The distance L1 from the end of the upper flange 24 to the axis of the first stud 30 is set to the shortest distance. For this reason, the distance L2 from the web 28 of the H-section steel 22 to the first stud 30 is the longest distance within a settable range. Thereby, the fixing length of the distribution muscle 46 becomes long, and the fixing property of the distribution muscle 46 can be improved.

  Even if the composite beam 14 of the H-shaped steel 22 is bent, the upper surface of the slab concrete 52 is leveled according to the bending, so that the upper surface of the upper flange 24 of the H-shaped steel 22 and the upper surface of the slab concrete 52 The generation of steps can be suppressed. Furthermore, since the reinforcing bar 34 is present in the length direction of the H-shaped steel 22 and where the first stud 30 is not present, the fixing property of the concrete is improved.

  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.

  5A and 5B are cross-sectional views of a beam slab structure 70 in one layer of the building 60 constructed on the ground (not shown). In addition, although the building 60 has the some pillar 12 (refer FIG. 1), illustration is abbreviate | omitted here. The beam slab structure 70 includes a plurality of composite beams 72 installed on the column 12, a small beam 90 installed on the composite beam 72, and a concrete placed on the upper side of the small beam 90, and is flush with the upper surface of the composite beam 72. And a slab 74 that spreads out.

  As shown in FIG. 5A, the composite beam 72 has an H-section steel 22. Precast concrete 76 is formed on both surfaces of the web 28 of the H-shaped steel 22 and is precast from the upper surface of the lower flange 26 to a height corresponding to the upper surface of the small beam 90 with the width of the lower flange 26. Further, a reinforcing bar 78 for reinforcing the composite beam 72 is attached in the vicinity of the second stud 32.

  As shown in FIG. 5B, a gusset plate 92 having a joint surface 92 </ b> A protruding toward the small beam 90 is disposed at a portion corresponding to the end of the small beam 90 of the H-section steel 22. . Here, the end portion of the small beam 90 is joined to the joining surface 92 </ b> A of the gusset plate 92 by the bolt 40.

  As shown in FIGS. 5A and 5B, the other end of the deck plate 42 is placed on the upper surface of the small beam 90. A deck adjustment plate 44 is placed below the end 42C of the deck plate 42.

  On the upper side of the deck plate 42, a distribution bar 80 is disposed in a direction intersecting the length direction of the H-section steel 22. A main bar 48 is disposed along the length direction of the H-section steel 22 so as to intersect with the distribution bar 80. The end of the reinforcing bar 80 is a U-shaped hook 80A bent in a U-shape, and the distributing bar 80, the first stud 30, and the reinforcing bar 34 are bound by a binding wire 35.

  Further, concrete is cast on the deck plate 42 so as to be flush with the upper surface of the upper flange 24 of the H-section steel 22 to form slab concrete 82. In addition, although concrete is cast also in the H-section steel of the small beam 16, illustration is abbreviate | omitted.

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

  As shown in FIG. 6A, the first stud 30 is joined to the lower surface of the upper flange 24 of the H-section steel 22, and the second stud 32 is joined to both surfaces of the web 28. Then, a reinforcing bar 78 is attached in the vicinity of the second stud 32. As shown in FIG. 6B, gusset plates 92 are provided in advance on both surfaces of the web 28 at a predetermined position of the H-section steel 22 by welding.

  Subsequently, as shown in FIG. 6A, the formwork (not shown) is placed on both sides of the web 28 of the H-shaped steel 22 from the tip of the lower flange 26 of the H-shaped steel 22 to the upper surface of the small beam 90. Install to the corresponding height. Then, concrete is cast between the mold and the web 28 to form precast concrete 76. After curing the precast concrete 76, the H-section steel 22 to which the precast concrete 76 is fixed is bridged between the columns 12 (similar to FIG. 1).

  Subsequently, as shown in FIG. 6B, the beam 90 is moved so that the distance from the upper surface of the upper flange 24 to the upper surface of the beam 90 is equal to the set thickness of the slab concrete 82 (see FIG. 5). Deploy. Then, the end of the small beam 90 and the gusset plate 92 are joined with the bolt 40.

  Subsequently, the deck plate 42 is placed on the upper surface of the small beam 90. At this time, the end portion 42 </ b> C of the deck plate 42 is disposed below the end portion of the upper flange 24. Then, as shown in FIG. 6A, the reinforcing bar 34 is disposed on the web 28 side of the first stud 30. Further, the deck plate 42 is fixed to the upper surface of the small beam 90 by spot welding.

  Subsequently, as shown in FIG. 6A, the reinforcing bars 80 and the main bars 48 are arranged on the upper side of the deck plate 42. At this time, the U-shaped hook 80 </ b> A of the distribution bar 80 is disposed below the upper flange 24 beyond the reinforcing bar 34. Then, the first stud 30, the reinforcing bar 34, and the distribution bar 80 are bound by the binding wire 35.

  Subsequently, the deck adjustment plate 44 is disposed on a part of the upper surface of the precast concrete 76, and a gap below the upper flange 24 from between the upper flange 24 and the end 42 </ b> C of the deck adjustment plate 44 and the deck plate 42. Concrete is placed on the deck plate 42 as well as concrete.

  Here, the end portion 42 </ b> C of the deck plate 42 is a valley portion, and is overlapped with the deck adjustment plate 44 below the upper flange 24 to form a flat plate shape. 42A is not arranged. Thereby, the distance C between the lower surface of the upper flange 24 and the upper surface of the deck adjusting plate 44 is larger than the distance D between the lower surface of the upper flange 24 and the upper surface 42A of the deck plate 42, that is, the web 28 is made of concrete. The filling port when filling is widened and the filling property of concrete is improved.

  On the other hand, when placing concrete on the deck plate 42, the concrete surface is leveled so that the upper surface of the upper flange 24 of the H-section steel 22 and the upper surface of the slab concrete 82 (see FIG. 5) are flush with each other. That is, when the upper flange 24 is in a bent state in which the central portion is lower than the end portion, the upper surface of the slab concrete 82 is aligned with the upper surface of the upper flange 24 so that the central portion is lower than the end portion. Equalize.

  By the above construction process, as shown in FIGS. 5A and 5B, the beam slab structure 70 and the building 60 are constructed.

  Here, the presence of the small beam 90 allows a vertical load acting on the slab concrete 82 (see FIG. 3) to be transmitted from the deck plate 42 to the H-section steel 22 via the small beam 90. . Thereby, even when the force distribution reinforcement 46 cannot be continued between each slab concrete 82 by the web 28 of the H-section steel 22, the proof strength with respect to the vertical load which acts on the slab concrete 82 can be improved.

  Even if the composite beam 72 of the H-shaped steel 22 is bent, the upper surface of the slab concrete 82 is leveled according to the bending, so that the upper surface of the upper flange 24 of the H-shaped steel 22 and the upper surface of the slab concrete 82 The generation of steps can be suppressed.

  Furthermore, since the reinforcing bar 34 is present in the length direction of the H-shaped steel 22 and where the first stud 30 is not present, the fixing property of the concrete is improved. Further, since the U-shaped hook 80A of the distribution bar 80 is hung on the slab concrete 82 and is difficult to be removed, the fixing property of the distribution bar 80 is improved.

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

  The number of the first studs 30 or the second studs 32 may be not only two or four in the cross-sectional views shown in FIGS. Further, the end 42C of the deck plate 42 may be disposed so as to overlap the end of the upper flange 24 in plan view.

10 Building (Building)
12 pillars
14 Composite beam (Composite beam)
16 Small beam
20 Beam slab structure 22 H-section steel (H-section steel)
24 Upper flange (upper flange)
28 Web
30 1st stud (1st stud)
32 Second stud (second stud)
34 Reinforcing bars (reinforcing bars)
35 Bundling wire (Bundling wire)
42 Deck plate
44 Deck adjustment plate (Deck adjustment plate)
46 Strength muscles
50 Web concrete (web concrete)
52 Slab concrete (slab concrete)
54 Formwork (Formwork)
60 Building (Building)
70 Beam Slab Structure 72 Composite Beam (Composite Beam)
76 Precast concrete (web concrete)
80 Strength bars (Power lines)
80A U-shaped hook (U-shaped hook)
82 Slab concrete (slab concrete)
90 Small beam

Claims (5)

H-section steel,
A first stud joined to the lower surface of the upper flange of the H-shaped steel;
A second stud joined to both sides of the H-shaped steel web;
A small beam erected on the H-shaped steel;
A corrugated deck plate placed on the beam and having a trough at the end disposed below the upper flange of the H-section steel ;
Web concrete built on both sides of the H-shaped steel web, wherein the second stud is embedded inside by concrete cast or precast concrete;
A slab concrete that is placed on the deck plate, the upper surface of which is flush with the upper surface of the upper flange of the H-shaped steel, and that is integrated with the web concrete and the first stud;
Composite beam with   2. The composite beam according to claim 1, further comprising reinforcing bars arranged in a length direction of the H-shaped steel along the first stud on the web side of the first stud.   The ends of the slab concrete distribution bars arranged in a direction intersecting the length direction of the H-shaped steel are U-shaped hooks, and the U-shaped hooks, the first studs, and the reinforcing bars are The composite beam according to claim 2, which is bound.   A building in which the composite beam according to any one of claims 1 to 3 is connected to a column. H-shaped steel with studs joined to the lower surface of the upper flange and both surfaces of the web
Joining the end of the beam to the H-shaped steel web,
A corrugated deck plate is placed on the beam and the trough at the end of the deck plate is placed below the upper flange ,
Reinforcing bars are placed on the web side of the stud on the lower surface of the upper flange ,
A power distribution bar having a U-shaped hook is disposed on the upper side of the deck plate, and the U-shaped hook is disposed on the lower side of the upper flange.
Bundling the stud on the lower surface of the upper flange, the reinforcing bar, and the U-shaped hook,
On both sides of the H-shaped steel web, a mold is attached from the tip of the lower flange of the H-shaped steel to the lower surface of the deck plate,
Placing concrete between the mold and the web from between the upper flange and the deck plate;
A synthetic beam construction method for leveling a concrete surface so that an upper surface of an upper flange of the H-shaped steel and an upper surface of the slab concrete are flush with each other when slab concrete is placed on the deck plate.

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