JP2020020140A - Floor structure - Google Patents

Abstract

To provide a floor structure capable of securing support strength of a floor surface having a step without complicating a bar arrangement structure.SOLUTION: A floor structure 12 comprises: a reinforced concrete beam 30 jointed to columns 20, provided with vertical haunch parts 32 and having steps 34 on an upper end face thereof; and floor panels 36, 38 provided on the upper end surface of the reinforced concrete beam 30 and each forming a stepped floor surface. At end parts of the reinforced concrete beam 30, upper end bars 50 are arranged to rise vertically from lower end bars 56 of lower parts of the vertical haunch parts 32 and bend horizontally to be fixed inside the column 20.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a floor structure.

  Patent Literature 1 below discloses a beam-column joint of a concrete structure in which a beam forming a waist wall is joined to a side surface of a column. In this structure, a ring-shaped reinforcing bar is arranged so as to surround one end of the main bar of the lumbar wall and the lower bar of the lower end of the beam. Arrange the muscles.

  Also, in Patent Document 2 below, by forming a beam at an intermediate portion in the axial direction of a haunched steel girder smaller than beams at both ends in the axial direction, both ends of a haunched steel girder in the axial direction are formed. There is disclosed a beam joining structure in which the lower surface of the beam is disposed below the lower surface of the intermediate portion, and equipment piping is disposed below the intermediate portion.

  Further, in Patent Document 3 below, a cross-sectional shape of a portion formed at a lower end portion of a foundation beam and a central portion of the foundation beam has an inverted T-shape, and the width of the lower end portion of the foundation beam is a portion above the lower end portion of the foundation beam. That is, there is disclosed a building in which the width is larger than the width of the central portion of the foundation.

JP 2012-215063 A JP 2014-77339 A JP-A-2006-186186

  In the structure described in Patent Literature 1, the reinforcement arrangement at the beam-column joint is complicated, and the workability is reduced.

  In the structure described in Patent Literature 2, the height of the upper surface of the haunched steel girder is the same, and no step is formed on the upper part of the haunched steel girder.

  In the structure described in Patent Literature 3, the width of the lower end of the foundation beam is larger than the upper portion of the lower end of the foundation beam, that is, the width of the central portion of the foundation upholstery.

  The present invention has been made in view of the above circumstances, and has as its object to provide a floor structure capable of securing the supporting strength of a floor having a step without complicating a reinforcing arrangement.

  The floor structure according to the first aspect of the present invention is a reinforced concrete beam that is joined to a column, has a vertical haunch portion, and has a step at an upper end surface, and a floor that is provided on an upper end surface of the reinforced concrete beam and forms a floor surface with a step. A slab, and an end upper end main bar which is arranged at an end of the reinforced concrete beam, rises vertically from a lower main bar at a lower portion of the vertical haunch portion, bends in the horizontal direction, and is fixed inside the column.

  According to the first aspect of the present invention, the reinforced concrete beam having the vertical haunch portion and having a step on the upper end surface is joined to the column. By providing a floor slab on the upper end surface of the reinforced concrete beam, a floor surface with a step is formed. At the end of the reinforced concrete beam, an upper end main reinforcement that rises vertically from the lower main reinforcement at the lower part of the vertical haunch and bends in the horizontal direction and is fixed inside the column is arranged. Thereby, the supporting strength of the floor slab in the portion where the step on the upper end surface is high can be secured. In addition, when changing the vertical height of the vertical haunch portion, it is possible to easily arrange the reinforcing bars on the steps having different heights by a processing method of changing a bending position of the reinforcing bar.

  A floor structure according to a second aspect of the present invention is the floor structure according to the first aspect, wherein the reinforced concrete beam has a constant beam width between a portion including the vertical haunch portion and another portion.

  According to the invention described in claim 2, the reinforced concrete beam has a constant beam width between the portion provided with the vertical haunch portion and the other portion, and the beam width between the vertical haunch portion and the other portion. , The strength of the vertical haunch can be increased.

  A floor structure according to a third aspect of the present invention is the floor structure according to the first or second aspect, wherein a seismic isolation device is provided below the column to be joined to the reinforced concrete beam.

  According to the third aspect of the present invention, the seismic isolation device is provided below the column to be joined to the reinforced concrete beam to suppress the shaking of the floor slab due to the earthquake.

  ADVANTAGE OF THE INVENTION According to the floor structure of this invention, the supporting strength of the floor with a level | step difference can be ensured, without complicating a reinforcement arrangement structure.

It is an elevation sectional view showing the structure to which the floor structure of a 1st embodiment was applied. It is an elevation sectional view showing reinforcement of a floor structure of a 1st embodiment. FIG. 3 is a cross-sectional view (a cross-sectional view taken along line 3-3 in FIG. 2) of a reinforcing bar at a longitudinal end of a reinforced concrete beam used in the floor structure of the first embodiment. It is a top view showing the structure to which the floor structure of a 2nd embodiment was applied. FIG. 5 is a vertical sectional view (a sectional view along line 5-5 in FIG. 4) showing a structure to which the floor structure of the second embodiment is applied.

  Embodiments of the present invention will be described in detail with reference to the drawings. In addition, each figure is a schematic one, and illustrations that are not relevant to the present invention are omitted.

[First Embodiment]
The floor structure according to the first embodiment will be described with reference to FIGS.

(Construction)
FIG. 1 is a vertical sectional view showing a structure (building) 10 to which a floor structure 12 of the present embodiment is applied. As shown in FIG. 1, the structure 10 is installed on a foundation 14 while being seismically isolated and supported by a plurality of seismic isolation devices 16. The structure 10 includes a plurality of upper foundations 18 respectively installed above the plurality of seismic isolation devices 16. Each of the plurality of upper foundations 18 is provided with a pillar 20. That is, the lower end of the pillar 20 is joined to the upper foundation 18, and the outer shape of the upper foundation 18 is larger than the outer shape of the pillar 20 in a sectional view. In the present embodiment, the pillar 20 and the upper foundation 18 are constructed of reinforced concrete.

  The structure 10 includes a reinforced concrete beam 22 connected between adjacent columns 20 at the center in FIG. The beam of the reinforced concrete beam 22 is substantially uniform along the axial direction (longitudinal direction). Although not shown, reinforced concrete beams 22 connected between the plurality of columns 20 are arranged on the structure 10 at a plurality of intervals. A floor panel 24 is provided on the upper surface side of a plurality of adjacent reinforced concrete beams 22. The structure 10 includes two floor structures 12 provided between adjacent columns 20 on the outside in the axial direction of the reinforced concrete beam 22 in FIG. The two floor structures 12 have substantially the same configuration.

  The floor structure 12 is provided with a reinforced concrete beam 30 connected between adjacent columns 20. The reinforced concrete beam 30 is provided with two vertical haunch portions 32 at an intermediate portion in the axial direction (longitudinal direction). The upper end surface of the reinforced concrete beam 30 is provided with a step 34 constituted by a high upper surface portion 34A on both sides in the axial direction and a low upper surface portion 34B at the central portion in the axial direction (see FIG. 2). That is, the step 34 is composed of the upper surface portions 34A on both sides in the axial direction of the reinforced concrete beam 30, and the lower surface portions 34B corresponding to the two vertical haunch portions 32 between the high surface portions 34A. Further, the floor structure 12 is provided with a floor panel 36 on both sides and a floor panel 38 at the center which form a stepped floor surface at two high upper surfaces 34A and two lower upper surfaces 34B of the reinforced concrete beam 30. . Here, the floor panels 36 and 38 are examples of a floor slab.

  The axial end of the reinforced concrete beam 30 is joined to the upper corner of the reinforced concrete upper foundation 18, and the axial end of the reinforced concrete beam 30 and the upper foundation 18 are integrated. The reinforced concrete beam 30 has a shape in which the upper central portion in the axial direction of a substantially rectangular outer shape is concavely depressed in a side view.

  The lower end surface of the reinforced concrete beam 30 is a lower surface portion 35 extending in a substantially horizontal direction. That is, no step is provided on the lower surface portion 35. Although not shown, reinforced concrete beams 30 connected between the plurality of columns 20 are arranged in the floor structure 12 in parallel at a plurality of intervals. In the direction orthogonal to the axial direction of the reinforced concrete beam 30, a plurality of small beams (not shown) connecting the adjacent reinforced concrete beams 30 are provided.

  The high upper surface portion 34 </ b> A is provided on both ends in the axial direction of the reinforced concrete beam 30, that is, on the side joined to the column 20. A floor panel 36 on one side (for example, the left side in FIG. 1) includes a plurality of high-side portions 34 </ b> A in the axial direction of the adjacent reinforced concrete beam 30 (for example, on the left side in FIG. 1) and a plurality of adjacent reinforced concrete beams 30. Are provided on the upper surface side of the small beam. A floor panel 36 on the other side (for example, the right side in FIG. 1) is a plurality of members that connect the other high-side surface portion 34A in the axial direction of the adjacent reinforced concrete beam 30 (for example, the right side in FIG. 1) and the adjacent reinforced concrete beam 30. Are provided on the upper surface side of the small beam. In addition, the floor panel 38 is disposed on the upper surface side of a plurality of small beams that connect the low upper surface portion 34B of the adjacent reinforced concrete beam 30 and the adjacent reinforced concrete beam 30.

  The vertical height of the floor panel 38 is lower than the vertical height of the floor panels 36 on both sides of the floor panel 38. For example, the difference between the height of the upper surface of the floor panel 36 and the height of the upper surface of the floor panel 38 (floor step) is set to 1300 to 1850 mm. In the present embodiment, the difference between the height of the upper surface of the floor panel 36 and the height of the upper surface of the floor panel 38 (floor step) is set to 1850 mm as an example. A general floor step is about 100 to 300 mm, but the floor step of the floor structure 12 of the present embodiment is considerably larger than a general floor step.

  A wall panel 42 is provided on the side surface of the vertical haunch portion 32 of the reinforced concrete beam 30 so as to be bridged between the adjacent reinforced concrete beams 30.

  The structure 10 is used as, for example, a rotary press factory for newspaper printing, and a huge rotary press 44 is disposed on a floor panel 38 inside a building. In order to improve the efficiency of newspaper printing work, the height of the floor panel 38 needs to be lowered from the height of the floor panel 36 by, for example, about 1600 to 1850 mm. In addition, since the rotary press 44 is quite heavy, the floor panels 36 and 38 need to be stably supported by the reinforced concrete beams 30.

  In the reinforced concrete beam 30 of the present embodiment, the lower surface 34B is formed by providing the vertical haunch portion 32 at a portion where the height needs to be reduced. In the reinforced concrete beam 30, the structural performance of the reinforced concrete beam 30 is improved by increasing the height of the beam on the high upper surface portion 34A side, which does not need to be lowered.

  FIG. 2 shows an arrangement of reinforcing bars of the reinforced concrete beam 30 in a vertical sectional view along the axial direction. FIG. 3 is a cross-sectional view in a direction perpendicular to the axial direction of the reinforced concrete beam 30 on the side of the high upper surface portion 34A. The reinforcement arrangement of the reinforced concrete beams 30 is symmetrical in the axial direction. As shown in FIG. 2 and FIG. 3, a plurality of (for example, six) upper end streaks 50 are horizontally (horizontally) provided on the upper side of the high upper surface portion 34 </ b> A at both ends in the axial direction of the reinforced concrete beam 30. (See FIG. 2). The plurality of upper end streaks 50 are provided on the upper surface portion 34 </ b> A sides on both axial sides of the reinforced concrete beam 30, respectively. Here, the upper end streak 50 is an example of an upper end main streak.

  A plurality of (for example, six) central upper bars 52 are arranged in the horizontal direction (lateral direction) so as to straddle the upper part of the lower upper surface portion 34B in the axial direction of the intermediate portion in the vertical direction of the reinforced concrete beam 30. Below the plurality of upper central streaks 52, a plurality (for example, six) of lower central streaks 54 are arranged in a horizontal direction (lateral direction). In the axial direction of the lower end in the vertical direction of the reinforced concrete beam 30, a plurality (for example, six) of lower end reinforcements 56 are arranged in the horizontal direction (lateral direction) along the lower surface 35. Here, the lower end muscle 56 is an example of the lower end main muscle.

  As shown in FIG. 3, a plurality of abdominal muscles 58 are arranged in the axial direction (horizontal direction) at an intermediate portion in the vertical direction of the reinforced concrete beam 30. The abdominal muscles 58 are arranged as a pair in the beam width direction (the direction orthogonal to the axial direction of the reinforced concrete beam 30). The pair of abdominal muscles 58 are arranged at intervals in the up-down direction. In the beam width direction of the reinforced concrete beam 30 (a direction orthogonal to the axial direction), width stop bars 64 are arranged in a horizontal direction (lateral direction) so as to contact a pair of abdominal muscles 58. In FIG. 2, the abdominal muscle 58 and the width stopping muscle 64 are not shown.

  Further, the reinforced concrete beam 30 has a plurality of (eg, five) upper end streaks 50, a plurality of abdominal streaks 58 in a vertical direction, and a plurality ( Stirrups 60 are arranged so as to surround five (for example, five) upper central muscles 52, a plurality (for example, five) of lower central muscles 54, and a plurality of (for example, five) lower muscles 56. ing. A plurality of stirrups 60 are arranged at intervals in the axial direction of the reinforced concrete beam 30 (see FIG. 2).

  Further, the reinforced concrete beam 30 has a plurality of (for example, five) upper end bars 50 on the other side (for example, the right side in FIG. 3) of the reinforced concrete beam 30 in the beam width direction and a plurality of abdominal bars 58 in the vertical direction. The stirrup 62 surrounds a plurality of (eg, five) upper central muscles 52, a plurality (eg, five) central lower muscles 54, and a plurality (eg, five) lower muscles 56. Has been arranged. A part of the stirrup 62 is arranged so as to overlap a part of the stirrup 60 in the beam width direction. A plurality of stirrups 62 are arranged at intervals in the axial direction of the reinforced concrete beam 30.

  As shown in FIG. 2, a plurality of small reinforcing bars 68 are arranged in the axial direction on the side of the vertical haunch portion 32 at the axial end of the reinforced concrete beam 30. The plurality of small reinforcing bars 68 are arranged at intervals in the vertical direction of the reinforced concrete beam 30. A plurality of cap bars 70 are arranged at the axial end of the reinforced concrete beam 30 so as to surround the upper central bar 52 and the lower central bar 54 from above. The plurality of cap bars 70 are arranged at intervals in the axial direction of the reinforced concrete beam 30.

  The upper end streaks 50 include a vertical streak portion 50A that rises vertically from a lower end streak 56 at a lower portion of the vertical haunch portion 32, and a horizontal streak portion 50B that is bent in a horizontal direction from an upper end portion of the vertical streak portion 50A. . A bent portion 50 </ b> C bent downward is formed at one end of the horizontal streak portion 50 </ b> B (the end opposite to the vertical streak portion 50 </ b> A), and is fixed inside the pillar 20.

  The central upper bar 52 includes a horizontal bar 52A arranged along the axial direction of the reinforced concrete beam 30, and a bent portion 52B bent downward from both axial ends of the horizontal bar 52A inside the column 20. Have.

  The lower end bar 56 includes a horizontal streak portion 56 </ b> A arranged along the axial direction of the reinforced concrete beam 30 and a bent portion 56 </ b> B bent upward from both axial ends of the horizontal streak portion 56 </ b> A inside the column 20. I have. The upper end of the bent portion 56B of the lower muscle 56 and the lower end of the bent portion 52B of the upper central muscle 52 are disposed so as to face in the horizontal direction, and are fixed inside the pillar 20.

  In the present embodiment, the upper end streaks 50 having the vertical longitudinal streak portions 50A and the center upper streaks 52 are separately arranged. That is, in a reinforced concrete beam having a general haunch portion, the upper streaks are continuous, but in the present embodiment, the upper streaks 50 and the center upper streaks 52 are separately arranged, so that the upper streaks are provided. Are not continuous.

  The reinforced concrete beam 30 is constructed by placing the concrete 74 with the reinforcing bars arranged as described above. The beam width of the reinforced concrete beam 30 is constant at a portion on the side of the lower upper surface portion 34B provided with the vertical haunch portion 32 and at the other upper portion 34A of the upper surface portion.

  The seismic isolation device 16 is provided below the column 20 joined to the reinforced concrete beam 30 as described above. The seismic isolation device 16 includes, for example, a disk-shaped upper flange 16A, a disk-shaped lower flange 16B, and a laminated rubber 16C disposed between the upper flange 16A and the lower flange 16B. In the seismic isolation device 16, the upper flange 16A is fixed to the upper foundation 18 by bolts (not shown), and the lower flange 16B is fixed to the foundation 14 by bolts (not shown).

(Action and effect)
Next, the operation and effect of the present embodiment will be described.

  In the floor structure 12, the reinforced concrete beam 30 to be joined to the column 20 includes a vertical haunch portion 32, and a step formed by an upper end surface having a high upper surface portion 34A on both axial sides and a low upper surface portion 34B at an axial center portion. 34 are provided. Further, the floor panels 36 and 38 are provided on the high upper surface portion 34A and the low upper surface portion 34B of the reinforced concrete beam 30, so that a stepped floor surface is formed. At the end of the reinforced concrete beam 30, an upper end bar 50 is provided which rises vertically from a lower end bar 56 below the vertical haunch portion 32, bends in the horizontal direction, and is fixed inside the column 20. Accordingly, the beam height of the reinforced concrete beam 30 on the side of the high upper surface 34A at both ends in the axial direction can be increased, and the structural performance is improved. For this reason, the supporting strength of the floor panel 36 of the high upper surface portion 34A having a high step at the upper end surface can be ensured.

  Further, in the floor structure 12, since the upper end streaks 50 can be bent linearly and arranged, the arrangement of the reinforcements is simple, and the workability of the arrangement of the reinforcements is improved. In addition, the beam height of the reinforced concrete beam 30 on the side of the high upper surface portion 34A in the axial direction is large, and the structural performance is improved. Can be reduced. Therefore, the required amount of concrete and the amount of rebar of the reinforced concrete beam 30 can be reduced.

  Furthermore, when changing the height of the vertical haunch portion 32 in the vertical direction, it is possible to easily arrange the reinforcing bars on the steps 34 having different heights by a processing method of changing the position at which the upper end of the upper end streak 50 is bent.

  In the floor structure 12, the reinforced concrete beam 30 has a constant beam width between the lower surface portion 34B side provided with the vertical haunch portion 32 and the other upper surface portion 34A. Therefore, in the reinforced concrete beam 30, the strength of the vertical haunch portion 32 can be increased as compared with the case where the beam width between the vertical haunch portion and other portions is changed.

  In the floor structure 12, the seismic isolation device 16 is provided below the column 20 that is joined to the reinforced concrete beam 30, and the shaking of the floor panels 36 and 38 due to the earthquake is suppressed.

  Further, the floor structure 12 includes two vertical haunch portions 32 at an intermediate portion in the axial direction of the reinforced concrete beam 30. Therefore, with a simple configuration, the height of the floor panel 38 at the intermediate portion in the axial direction of the reinforced concrete beam 30 can be made lower than the height of the floor panels 36 on both axial sides of the reinforced concrete beam 30.

  On the other hand, as a structure for forming a step in a floor slab, for example, a structure in which a waist wall is constructed on a beam at a joint between a beam and a column, or a structure in which a waist wall is additionally struck on a beam at a joint between a beam and a column is high A structure for constructing a part is conceivable. Further, for example, a structure is conceivable in which diagonal reinforcement is provided at the end of a reinforced concrete beam by a normal haunch process, and a floor panel is disposed by additionally striking the diagonally disposed part.

  However, in the structure where the step is formed by the lumbar wall or additional striking, the supporting strength can be expected only in the lower part of the beam, and the supporting strength of the lumbar wall or the additional striking portion is weak, and the structural performance may be insufficient. is there.

  Further, in a structure in which a normal haunch process is performed on the end of a reinforced concrete beam, the normal haunch process portion bends a reinforcing bar, so that the triangular portion is additionally struck. In the normal haunching process, since the reinforcing bars are arranged diagonally, the reinforcing bar bending work is complicated, and the working efficiency may be reduced.

  On the other hand, in the floor structure 12 of the present embodiment, the reinforced concrete beam 30 having the vertical haunch portion 32 and having the step 34 on the upper end surface is provided. For this reason, the supporting strength of the floor panels 36 and 38 (particularly the high height floor panel 36) having the steps 34 can be secured without complicating the reinforcing arrangement.

[Second embodiment]
Next, a floor structure according to the second embodiment will be described with reference to FIGS. 4 and 5. Note that the same components as those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 4 is a plan view showing a structure 100 to which the floor structure 102 of the present embodiment is applied, and FIG. 5 is a vertical sectional view of the structure 100 to which the floor structure 102 is applied. It is shown. As shown in FIG. 4, the structure 100 includes a plurality of columns 104 and 106 and a wall 108 arranged to be connected to the adjacent columns 104 and 106. The wall 108 is formed in a substantially U shape in plan view. The structure 100 includes a work place 110 inside a building surrounded by a wall 108. The workplace 110 has a substantially rectangular shape, and an opening 112 is provided on one side of the workplace 110 along the longitudinal direction.

  The floor structure 102 includes a plurality of reinforced concrete beams 120 connected between adjacent columns 104. The reinforced concrete beams 120 are arranged substantially parallel to the longitudinal direction of the work place 110.

  As shown in FIG. 5, the reinforced concrete beam 120 includes a vertical haunch portion 122, and a step 124 composed of a high upper surface portion 124A and a low upper surface portion 124B is provided on the upper end surface. Further, the floor structure 102 includes floor panels 126 and 128 that form a stepped floor surface at the high upper surface portion 124A and the low upper surface portion 124B of the reinforced concrete beam 120 (see FIG. 4). Here, the floor panels 126 and 128 are examples of a floor slab.

  Although not shown, the floor structure 102 is provided with a plurality of small beams that connect adjacent reinforced concrete beams 120 in a direction orthogonal to the axial direction of the reinforced concrete beams 120.

  The high upper surface portion 124A is provided on one end side (the side joined to one pillar 104) of the reinforced concrete beam 120 in the axial direction. The floor panel 126 is disposed on the upper surface side 124A of the adjacent reinforced concrete beam 120 and on the upper surface side of the plurality of small beams. The low upper surface portion 124 </ b> B is provided on the other end side of the reinforced concrete beam 120 in the axial direction (the side joined to the other pillar 104). The floor panel 128 is disposed on the lower surface portion 124B of the adjacent reinforced concrete beam 120 and on the upper surface side of the plurality of small beams. The height of the floor panel 128 in the vertical direction is lower than the height of the floor panel 126 in the vertical direction. For example, the difference between the height of the upper surface of floor panel 128 and the height of the upper surface of floor panel 126 (floor step) is 1300 to 1850 mm.

  The beam width of the reinforced concrete beam 120 is constant at a portion on the side of the lower upper surface 124B having the vertical haunch portion 122 and at a portion of the upper surface 124A that is the other portion (see FIG. 4).

  The reinforcement arrangement structure of the reinforced concrete beam 120 is the same as the one end side in the axial direction (for example, the left side in the axial direction in FIG. 2) of the reinforced concrete beam 30 of the first embodiment shown in FIG. . That is, on the high upper surface portion 124A side of the reinforced concrete beam 120, the upper end streaks (upper end portions) which rise vertically from the lower end streaks at the lower part of the vertical haunch portion 122, bend in the horizontal direction and are fixed inside the pillar 104. Main bar) is arranged.

  As shown in FIG. 5, the lower end of the pillar 104 is joined to the upper foundation 18. A seismic isolation device 16 is provided between the foundation 14 and the upper foundation 18.

  As shown in FIG. 4, a floor panel 130 having substantially the same height as the floor panel 128 is installed on the opening 112 side of the work place 110. The structure 100 is used as a truck berth for loading a load by placing a transport truck 140 in the work place 110. In the structure 100, the area of the floor panel 128 and the floor panel 130 that is lower than the height of the floor panel 126 is a track yard, and is used as a place for a plurality of trucks 140 to approach. On the floor panel 126 that is higher than the height of the floor panel 128, a transport device 142 for transporting a load to a plurality of trucks 140 is installed. The area of the floor panel 126 is used as a place to load a plurality of trucks 140. The height of the floor panel 128 needs to be reduced by 1600 to 1850 mm with respect to the height of the floor panel 126 in order to improve the efficiency of the loading operation of the load. Since the truck berth is quite large in weight, it needs to be stably supported by the reinforced concrete beam 120.

  In the floor structure 102, a similar effect can be obtained by a configuration similar to that of the first embodiment. That is, in the floor structure 102, the beam height is large on the high upper surface portion 124 </ b> A side where the step of the upper end surface of the reinforced concrete beam 120 is high. Therefore, the supporting strength of the floor panel 126 can be ensured. In addition, although the beam height of the lower upper surface portion 124B of the reinforced concrete beam 120 is smaller than that of the upper surface portion 124A, a sufficient beam height for the load of the track berth is secured.

[Supplemental explanation]
The floor structures 12 and 102 of the first and second embodiments may be used for applications other than a newspaper printing press factory and a truck berth. For example, the floor structure of the present invention can be applied when a high load-bearing capacity is required, such as a dance stage or a poolside floor.

  In the first and second embodiments, the reinforcing bar structure other than the upper end bar 50 may be appropriately changed without departing from the present invention. Further, the size of the upper end streaks 50 may be appropriately changed.

  In the floor structure 12 of the first embodiment, floor panels 36 and 38 are used, and in the floor structure 102 of the second embodiment, floor panels 126 and 128 are used, but the present invention is limited to these configurations. Not something. For example, a floor slab that is constructed on site and forms a floor with a step may be used.

  Although the floor structures 12, 102 of the first and second embodiments are provided above the foundation 14, the present invention is not limited to this configuration. For example, a configuration in which the floor structure of the present invention is provided on the upper floor of a building (for example, a portion of two or more floors) may be employed.

  Although the present invention has been described in detail with respect to a specific embodiment, the present invention is not limited to such an embodiment, and it is understood that various other embodiments are possible within the scope of the present invention. It is clear to the trader.

12 Floor structure 16 Seismic isolation device 20 Column 30 Reinforced concrete beam 32 Vertical haunch part 34 Step 36 Floor panel (an example of floor slab)
38 Floor panel (an example of floor slab)
50 Upper end bar (an example of the upper main bar at the end)
56 Bottom muscle (example of bottom major muscle)
102 Floor structure 104 Column 120 Reinforced concrete beam 122 Vertical haunch 124 Step 126 Floor panel (an example of floor slab)
128 floor panel (example of floor slab)

Claims (3)

A reinforced concrete beam that is joined to a column and has a vertical haunch part and a step on the upper end surface,
A floor slab that is provided on an upper end surface of the reinforced concrete beam and forms a floor surface with a step;
Reinforced concrete beams are arranged at the ends of the reinforced concrete beams, and the upper ends of the lower ends of the vertical haunches are vertically raised and bent in the horizontal direction to be fixed inside the pillars.
Floor structure.   2. The floor structure according to claim 1, wherein the reinforced concrete beam has a constant beam width between a portion including the vertical haunch portion and another portion. 3.   The floor structure according to claim 1, wherein a seismic isolation device is provided below the column to be joined to the reinforced concrete beam.