Skeleton structure of building

Abstract

To provide skeleton structure of a building in which a concrete slab with a thickened part can be supported by a steel beam with a simple configuration.SOLUTION: The skeleton structure 1 of a building has several pieces of steel columns 10, a steel beam 20 bridged across steel columns 10 adjacent to each other, and a concrete slab 30 supported by the steel beam 20. The concrete slab 30 has a body part 31 placed on a part of an upper flange (upper wall) 22 of the steel beam 20, and a thickened part 32 that is integrally run to the body part 31 and is formed thicker than the body part 31 and in which the other part of the upper flange 22 of the steel beam 20 is embedded.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a framework structure of a building. [Background technology]

[0002] For example, as the structural frame of a building such as an office building, a steel-frame construction having multiple steel columns, steel beams spanning adjacent steel columns, and a concrete slab supported by the steel beams is known (see, for example, Patent Document 1).

[0003] In this type of steel frame structure, the steel beams are typically made of H-shaped steel, and the concrete slab is placed on the upper flange (top wall) of the steel beam and supported by the steel beam. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2014-9502 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the framework structure of a building such as that described above, when it is necessary to increase the strength of a portion of the concrete slab, for example by making part of the concrete slab a cantilever slab that protrudes outside the building, that portion of the concrete slab may be configured as an increased thickness portion that is thicker than other portions.

[0006] However, if part of a concrete slab is made into a thickened section, for example if the level of the top surface of the concrete slab is constant, the height or level of the bottom surface of the concrete slab will be lower in the thickened section than the height or level of the bottom surface of other parts, resulting in a step shape.This means that it will be necessary to fix raising materials such as angle irons to the steel beams to align the level of the thickened section with the other parts, which creates the problem of complicating the structure of the structure.

[0007] In particular, when part of the concrete slab is made into a cantilever slab, it is necessary to use raiser materials to align the level of the majority of the concrete slab other than the cantilever slab, which increases the amount of raiser materials used and the labor required to fix the raiser materials.

[0008] The present invention has been made in consideration of such problems, and its purpose is to provide a building framework structure that enables a concrete slab having a thickened portion to be supported by steel beams with a simple configuration. [Means for solving the problem]

[0009] The building skeleton structure of the present invention is a building skeleton structure having a plurality of steel columns, steel beams spanning adjacent steel columns, and a concrete slab supported by the steel beams, wherein the concrete slab has a main body portion placed on a part of the upper wall of the steel beam, and a thickened portion that is integrally connected to the main body portion and is formed to be thicker than the main body portion, and in which another part of the upper wall of the steel beam is embedded.

[0010] In the framework structure of the building of the present invention, in the above-mentioned configuration, it is preferable that reinforcing steel bars are embedded inside the thickened portion above the steel beams and straddle the steel beams.

[0011] In the framework structure of the building of the present invention, in the above-mentioned configuration, it is preferable that a part of the thickened portion protrudes to the outside of the building to form a cantilever slab. Effect of the Invention

[0012] According to the present invention, it is possible to provide a building framework structure in which a concrete slab having a thickened portion can be supported by steel beams with a simple configuration. [Brief description of the drawings]

[0013] [Figure 1] FIG. 2 is a plan view of a certain floor of a building having a framework structure according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line BB in FIG. [Figure 4] FIG. 3 is a cross-sectional view taken along line CC in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, a detailed example of a building skeleton structure 1 (hereinafter, sometimes simply referred to as "skeleton structure 1") according to an embodiment of the present invention will be described with reference to the drawings.

[0015] The skeleton structure 1 shown in Figures 1 and 2 is applied to a steel-framed building 100 such as an office building. In this embodiment, the building 100 has multiple floors, and the portion of the skeleton structure 1 shown in Figures 1 and 2 is in the upper floors of the building 100 above the ground floor.

[0016] It should be noted that the building 100 is not limited to an office building having multiple floors.

[0017] The skeleton structure 1 has a plurality of steel columns 10, steel beams 20 spanning adjacent steel columns 10, and a concrete slab 30 supported by the steel beams 20.

[0018] The multiple steel columns 10 are each formed of a square steel pipe and are arranged at intervals from one another. The multiple steel columns 10 are not limited to square steel pipes, and may be formed of steel of other shapes, such as H-shaped steel.

[0019] The steel beams 20 are connected at one end to a steel column 10 and at the other end to another steel column 10, so that they are supported in a bridging state between adjacent steel columns 10. In this embodiment, the multiple steel beams 20 are each bridged between a steel column 10 disposed at the outermost position of the building 100 and a steel column 10 disposed on the inner side of the building 100 relative to the steel column 10. Each of the multiple steel beams 20 is a main girder.

[0020] A part of each steel beam 20 may be formed with a joint 11 that is previously joined to the steel column 10 at a factory or the like. In this case, the diaphragm provided between the steel column 10 and the joint 11 may be, for example, a through diaphragm, an inner diaphragm, or the like, which may be provided at an appropriate position depending on the size and thickness of the steel column 10, the steel beam 20, and the concrete slab 30.

[0021] In this embodiment, each of the multiple steel beams 20 is formed of an H-shaped steel. That is, each steel beam 20 is a steel beam with an H-shaped cross section, which has a web 21 arranged in a vertical position, an upper flange 22 as an upper wall fixed to the upper end of the web 21, and a lower flange 23 fixed to the lower end of the web 21. The steel beam 20 is not limited to an H-shaped steel, and may be formed of a steel beam of another shape, such as a square steel pipe.

[0022] The skeleton structure 1 further has a plurality of exterior steel beams 40 that are bridged between a pair of steel columns 10 that are positioned on the outermost sides of the building 100. Each exterior steel beam 40 is connected at one end to a steel column 10 and at the other end to another steel column 10, thereby being supported in a bridged state between the adjacent steel columns 10. These exterior steel beams 40 are also main girders, and each is formed of an H-shaped steel.

[0023] The concrete slab 30 is supported by the steel beams 20 and constitutes the floor portion of the upper floor of the building 100. Although not shown in detail, the concrete slab 30 is formed by pouring concrete onto a deck fixed to the steel beams 20.

[0024] As shown in FIG. 2, the concrete slab 30 has a main body portion 31 and a thickened portion 32.

[0025] In Figures 1 and 2, a portion of the main body portion 31 is omitted, but in this embodiment, the area (floor area) of the main body portion 31 in a plan view is larger than the area (floor area) of the thickened portion 32 in a plan view.

[0026] The main body 31 is in the form of a plate with a predetermined thickness between the lower surface 31a and the upper surface 31b, and constitutes a predetermined area of ​​the inside of the building 100 of the concrete slab 30.

[0027] The thickened portion 32 has a thickness between the lower surface 32a and the upper surface 32b that is thicker than the thickness of the main body portion 31, and is integrally connected to the main body portion 31 to form a specified area of ​​the concrete slab 30 outside the building 100.

[0028] In this embodiment, the upper surface 32b of the thickened portion 32 is at the same height or level as the upper surface 31b of the main body portion 31, and the lower surface 32a of the thickened portion 32 is at a lower height or level than the lower surface 31a of the main body portion 31. Therefore, the concrete slab 30 has a stepped shape in which the lower surface 31a of the main body portion 31 is at a higher height or level than the lower surface 32a of the thickened portion 32.

[0029] A plurality of reinforcing bars 33 are arranged in a lattice pattern inside the concrete slab 30. In this embodiment, a plurality of reinforcing bars 33 are arranged in one layer inside the main body portion 31, and a plurality of reinforcing bars 33 are arranged in two layers, upper and lower, inside the thickened portion 32. Note that, for the sake of convenience, only some of the reinforcing bars 33 are labeled with reference numerals in Figs. 2 to 4.

[0030] In this embodiment, a part of the thickened portion 32 protrudes to the outside of the building 100 (outside the outermost outer steel beam 40), and the protruding part constitutes a cantilever slab 34. The cantilever slab 34 may constitute, for example, the eaves of the building 100, but may also be used for other purposes, such as constituting a veranda, balcony, etc. of the building 100.

[0031] The thickened portion 32 constituting the cantilever slab 34 is provided across both the inside and outside of the building 100, sandwiching the outermost outer steel beam 40 of the building 100. This increases the strength of the cantilever slab 34 that protrudes outward from the outer steel beam 40, and also increases the strength of a specified range of the portion connected to the cantilever slab 34 that is on the inside of the outer steel beam 40, thereby increasing the load resistance of the cantilever slab 34.

[0032] 2 and 3, the main body 31 is placed at its lower surface 31a on a part of the upper flange 22 of the steel beam 20 and is supported by the steel beam 20. The steel beam 20 on which the concrete slab 30 is placed is disposed to extend across the main body 31 and the thickened portion 32.

[0033] 1 and 2, the main body 31 may be placed on one or more small beams 50 that are bridged between adjacent steel beams 20 and supported by the small beams 50. The main body 31 may also be supported by multiple inner girders 60 that are bridged between multiple steel columns 10 inside the building 100.

[0034] The main body 31 is placed on the upper flange 22 of the steel beam 20 at the lower surface 31a and supported by the steel beam 20, while the thickened portion 32 is configured by embedding the other portion of the upper flange 22 of the steel beam 20 other than the portion on which the main body 31 is placed, as shown in Figs. 2 and 4. In this embodiment, the thickened portion 32 is configured by embedding the entire upper flange 22 of the steel beam 20 formed of H-shaped steel and a predetermined range above the web 21. In this way, the concrete slab 30 is not placed on the upper flange 22 of the steel beam 20 at the thickened portion 32, but is supported by the steel beam 20 inside the thickened portion 32 by embedding the upper flange 22 of the steel beam 20 inside the thickened portion 32. The other portion of the upper flange 22 of the steel beam 20 embedded in the thickened portion 32 is adjacent to the portion on which the main body 31 is placed in the extension direction of the steel beam 20.

[0035] As shown in Figures 1 and 2, the thickened portion 32 may be placed on one or more small beams 70 spanning between adjacent steel beams 20 and supported by the small beams 70 as well.

[0036] As described above, in the building framework structure 1 of this embodiment, the concrete slab 30 has a main body portion 31 and a thickened portion 32 that is integrally connected to the main body portion 31 and is formed to be thicker than the main body portion 31, so that the underside 31a of the main body portion 31 and the underside 32a of the thickened portion 32 are stepped and have different heights or levels.The main body portion 31 is supported by the steel beam 20 by being placed on a part of the upper flange 22 of the steel beam 20, while the thickened portion 32 is supported by the steel beam 20 inside the thickened portion 32 by being embedded in the other part of the upper flange 22 of the steel beam 20. With this configuration, according to the building structural structure 1 of this embodiment, the main body 31 and thickened portion 32 of the concrete slab 30 can be supported by the steel beams 20 with a simple configuration without using any bulking materials to match the height or level of the underside 31a of the main body 31 and the underside 32a of the thickened portion 32.This reduces the amount of steel used in the structural structure 1, and thereby reduces the cost and labor required for construction.

[0037] As shown in Fig. 2 and Fig. 4, the skeleton structure 1 according to this embodiment can also be configured such that reinforcing steel bars 80 are embedded above the steel beams 20 inside the thickened portion 32, straddling the steel beams 20. In this embodiment, a plurality of reinforcing steel bars 80 shorter in length than the steel bars 33 are arranged parallel to each other and spaced apart from each other inside the thickened portion 32 between the upper flange 22 of the steel beams 20 and the upper reinforcing bar 33. Note that in Fig. 2, for convenience, only one reinforcing steel bar 80 is indicated by a reference symbol.

[0038] In this way, by configuring the thickened portion 32 so that reinforcing bars 80 are embedded above the steel beam 20 and straddle the steel beam 20, the strength of the portion between the upper flange 22 and the upper surface 32b of the thickened portion 32 is increased by the reinforcing bars 80, thereby preventing damage such as cracks from occurring in that portion.

[0039] It should be noted that at least one reinforcing steel bar 80 needs to be provided.

[0040] The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit and scope of the present invention.

[0041] For example, in the present embodiment, the thickened portion 32 constitutes a cantilever slab 34, but the present invention is not limited to this. [Explanation of symbols]

[0042] 1. Building structure 10 Steel column 11 Joint 20 Steel Beam 21 Web 22 Upper flange (upper wall) 23 Lower flange 30 Concrete slab 31 Main body 31a Bottom surface 31b Top surface 32 Thickened section 32a Bottom side 32b Top surface 33 Reinforcement 34 Cantilever Slab 40 Outside steel beam 50 Small beam 60 Inner girder 70 Small beam 80 Reinforcing steel bars 100 Buildings

Claims

1. A building structure having a plurality of steel columns, a steel beam spanning adjacent steel columns, and a concrete slab supported by the steel beam, The concrete slab is A main body portion placed on a part of the upper wall of the steel beam; a thickened portion that is integrally connected to the main body portion and is thicker than the main body portion, and into which another portion of the upper wall of the steel beam is embedded.

2. 2. The building structure according to claim 1, wherein reinforcing bars are embedded inside the thickened portion above the steel beams so as to straddle the steel beams.

3. 3. The building structure according to claim 1, wherein a part of the thickened portion protrudes to the outside of the building to form a cantilever slab.

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