Support structure for building

Abstract

To provide a support structure of a building for sufficiently restraining deflection in the tip of a cantilever beam, in the building having the cantilever beam.SOLUTION: A support structure 10 of a building includes a girder 21 joining a column 11 and a column 12, a cantilever beam 35 joined to the girder 21 in a cantilever manner, and an oblique beam 45 joined to the column 11 and a tip of the cantilever beam 35. The support structure 10 of the building further includes a cantilever beam 31 joined to the column 11 in a cantilever manner, and a beam 33 joining a tip of the cantilever beam 35 and a tip of the cantilever beam 31. Further, the end portion of the diagonal beam 45 is joined to the cantilever beam 35 and the beam 33.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to building support structures, and more particularly to building support structures with cantilever beams. [Background technology]

[0002] Buildings using cantilever beams for balconies and the like are well known. Patent Document 1 discloses one such building, which has a main frame consisting of a column and a floor beam spanning two adjacent columns, and a secondary frame provided outside the main frame. In the building of Patent Document 1, the secondary frame has a pair of lower cantilever beams and a pair of upper cantilever beams of the same length extending from two exterior columns. Furthermore, the secondary frame has a lower fascia and an upper fascia beam spanning the tips of the pair of lower cantilever beams and the tips of the upper cantilever beam, respectively, and a plurality of rafter members spanning between the upper fascia beams. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-91975 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in buildings equipped with cantilever beams, deflection can occur. However, in buildings equipped with conventional cantilever beams, there are cases where deflection cannot be sufficiently suppressed. [Means for solving the problem]

[0005] A support structure for a building that solves the above problem comprises a connecting beam that joins a first column and a second column, a first cantilever beam that is cantilevered to the connecting beam or the second column, and a diagonal beam that is joined to the first column and the tip of the first cantilever beam. [Effects of the Invention]

[0006] According to the present invention, in a building having a cantilever beam protruding from a column, deflection at the tip of the cantilever beam can be sufficiently suppressed. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view schematically illustrating a support structure of a building in an embodiment. [Figure 2] FIG. 2 is a plan view corresponding to FIG. 1 and schematically showing the supporting structure of the building. [Figure 3] FIG. 3 is a diagram corresponding to FIG. 2 and is an enlarged plan view of the main part of the support structure of the building. [Figure 4] FIG. 4 is a vertical cross-sectional view taken along line IV-IV in FIG. 3. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of a building support structure with a cantilever beam will be described below with reference to Figures 1 to 4. Here, a building support structure using square steel pipes as columns and H-shaped steel beams as beams will be described.

[0009] FIG. 1 is a perspective view that schematically shows a support structure 10 of a building, and FIG. 2 is a view corresponding to FIG. 1 and is a plan view that schematically shows the support structure 10 of a building. As shown in Figures 1 and 2, the building support structure 10 includes a column (first column) 11, a column (second column) 12, and columns 15, 16, 17, and 18. The columns 11, 12, 15, and 16 are spaced apart at the corners of a rectangle. The columns 17 and 18 are located closer to the interior of the building (inside the rooms) than the columns 11, 12, 15, and 16.

[0010] Adjacent columns 11 and 15 are joined by one small beam 13 and three small beams B1 arranged vertically across the small beam 13. The small beam 13 is arranged on the same floor as the diagonal beams described below. Adjacent columns 12 and 16 are joined by one small beam 14 and three small beams B2 arranged vertically across the small beam 14. The small beam 14 is arranged on the same floor as the diagonal beams described below.

[0011] The upper ends of adjacent columns 11 and 12 are joined by a beam B3. The support structure 10 for a building according to this embodiment is symmetrical about a center line C1 indicated by a dashed line in FIG.

[0012] Adjacent columns 11 and 12 are joined by a main beam 21, which serves as a connecting beam. The main beam 21 is located directly below the beam B3. The sub-beams 13 and 14 face each other across the main beam 21 and are joined by a sub-beam 22 that is located parallel to the main beam 21.

[0013] Adjacent columns 15 and 17 are joined by a beam 19. Adjacent columns 16 and 18 are joined by a beam 20.

[0014] The beam 22 and the column 17 are joined by a beam 23. The beam 22 and the column 18 are joined by a beam 24. Furthermore, the beam 22 and the main beam 21 are joined by beams 25, 26, 27, 28, and 29 that are arranged in parallel but spaced apart. The beams 25 and 26 are arranged in the extension directions of the beams 23 and 24, respectively.

[0015] One end of a cantilever beam 31 protruding toward the outside (outside the room) of the building's support structure 10 is joined to the column 11. One end of a cantilever beam 32 protruding toward the outside of the building is joined to the column 12. Cantilever beams 31 and 32 correspond to second cantilevers. Furthermore, the tip (outside end) of cantilever 31 and the tip (outside end) of cantilever 32 protruding from column 12 are joined by beam 33, which serves as an outer joining beam. Beam 33 is joined to main girder 21 via cantilever beams 35 and 36, which are spaced apart from each other. Each cantilever beam 35, 36 is located at a distance from cantilever beams 31, 32 toward center line C1. Cantilever beams 35, 36 correspond to first cantilever beams. In this embodiment, cantilever beams 35 and 36 are arranged in the extension directions of sub-beams 27 and 28, respectively.

[0016] In addition, the corner (intersection) where the cantilever beam 35 and the beam 33 intersect is joined to the column 11 by a diagonal beam 45. This diagonal beam 45 is welded to the column 11 via a diaphragm 41, and is also welded to the cantilever beam 35 and the beam 33 at these intersections. The corner (intersection) where the cantilever beam 36 and the beam 33 intersect is joined to the column 12 by a diagonal beam 46. This diagonal beam 46 is welded to the column 12 via a diaphragm 42, and is also welded to the cantilever beam 36 and the beam 33 at their intersections.

[0017] Next, the structure around the diagonal beam 45 of the support structure 10 of the building described above will be described in detail with reference to FIGS. Fig. 3 is a view corresponding to Fig. 2, and is an enlarged plan view of a main part of the support structure 10 of the building. Fig. 4 is a vertical cross-sectional view taken along line IV-IV in Fig. 3. Since the support structure 10 of the building is symmetrical with respect to the center line C1 in FIG. 2, the configuration on the left side of the paper with respect to the center line C1 will be described below, and the configuration on the right side will not be described.

[0018] As shown in Figure 3, the diagonal beam 45 is arranged to protrude diagonally from the column 11 toward the outside of the room, crossing the planar space surrounded by the main beam 21 and the cantilever beam 31, and the beam 33 and the cantilever beam 35.

[0019] The girder 21 has an upper flange 21t, a lower flange 21d, and a web 21w connecting these. The girder 21 also has a pair of reinforcing plates 21R in a direction perpendicular to the web 21w. The reinforcing plates 21R are disposed with the web 21w therebetween and are welded to the web 21w, the upper flange 21t, and the lower flange 21d. The reinforcing plate 21R of the main girder 21 is arranged so as to coincide with the extending direction of the webs of the sub-beams 25, 29 joined to the main girder 21.

[0020] Furthermore, the girder 21 has side reinforcing plates 21s that are substantially parallel to the web 21w. The side reinforcing plates 21s are welded to the ends of the upper flange 21t and the lower flange 21d of the girder 21.

[0021] The girder 21 is constructed by joining a plurality of steel beams together by a known joining method using splice plates 61, bolts 62, and nuts (not shown). A plurality of engagement holes (not shown) used for joining the diaphragms 41 and 43 are formed in the end of the girder 21 on the column 11 side.

[0022] As shown in Figures 3 and 4, the pillar 11 is provided with a pair of diaphragms 41, 43 that penetrate the pillar 11. The diaphragms 41, 43 have the same plate shape and are arranged spaced apart from each other in the vertical direction (height direction). In this embodiment, the diaphragm 41 is located above the diaphragm 43, and the distance between the diaphragms 41 and 43 is set to match the beam depth of the diagonal beam 45. As a result, the diaphragms 41, 43 are flush with the upper flange 45a and the lower flange 45b of the diagonal beam 45, respectively.

[0023] 3, the diaphragms 41 and 43 have a heptagonal plate shape including beam-corresponding sides 41a, 41b, and 41c. The beam-corresponding sides 41a, 41b, and 41c are provided so as to be perpendicular to the extension directions of the main girder 21, the diagonal beam 45, and the cantilever beam 31 connected to the column 11, respectively. Furthermore, reinforcing plates P1, P2, P3, and P4 extending in the vertical direction are welded to the diaphragms 41 and 43. Each of the reinforcing plates P1 to P4 is welded to the side surface of the square steel pipe of the column 11. The reinforcing plates P1 and P2 are provided so as to coincide with the extending directions of the side reinforcing plates 21s and web 21w on the indoor side of the girder 21. The reinforcing plates P3 and P4 extend vertically so as to coincide with the extending directions of the web 45w of the diagonal beam 45 and the side reinforcing plates 45s on the outdoor side, respectively.

[0024] The diaphragms 41 and 43 are formed with a plurality of engagement holes near the beam-corresponding sides 41a and 41b, which are used for joining to the main girder 21 and the diagonal beams 45. The diaphragms 41 and 43 are joined to the end of the girder 21 on the column 11 side. Here, the end of the upper flange 21t and the end of the lower flange 21d of the girder 21 are joined using a splice plate S1, bolts 66, and nuts (not shown) in a state where they are arranged so that they are flush with the diaphragms 41 and 43, respectively.

[0025] The beam end portion 31a of the cantilever beam 31 is welded to the beam-corresponding side 41c of the diaphragms 41 and 43. The main body 31 b of the cantilever 31 includes the tip of the cantilever 31 . The beam end portion 31a of the cantilever beam 31 and the main body portion 31b of the cantilever beam 31 are integrally joined together using a splice plate 63, a bolt 64, and a nut (not shown), thereby forming the cantilever beam 31.

[0026] The diagonal beam 45 has an upper flange 45a, a lower flange 45b, and a web 45w connecting them, as well as a pair of reinforcing members 45R and a pair of side reinforcing plates 45s. The reinforcing member 45R is disposed perpendicular to the plane of the web 45w and is welded to the web 45w, the upper flange 45a, and the lower flange 45b. The pair of side reinforcing plates 45s are disposed opposite each other across the web 45w, are welded to the end of the upper flange 45a, and the end of the lower flange 45b, and are disposed approximately parallel to the web 21w.

[0027] The tip of the diagonal beam 45 on the outdoor side has a shape that fits into the intersection of the beam 33 and the cantilever beam 35. The upper flange 45a on the outdoor side of the diagonal beam 45 is welded to the upper flanges of the beam 33 and the cantilever beam 35. In this embodiment, the cantilever beam 35 is provided with a reinforcing plate 35R that is on the same plane as the web 45w of the diagonal beam 45. The reinforcing plate 35R extends in a direction perpendicular to the plane of the web 35w of the cantilever beam 35 and is welded to the web 35w, the upper flange, and the lower flange. In this embodiment, one of the reinforcing plates 35R of the cantilever beam 35 is provided so as to coincide with the extension direction of the web 45w of the diagonal beam 45. A plurality of engagement holes are formed at the end of the diagonal beam 45 on the column 11 side to be used for joining to the diaphragms 41 and 43.

[0028] 4, the end of the diagonal beam 45 on the column 11 side is joined to the diaphragms 41 and 43, similar to the girder 21. In this case, the diagonal beam 45 is attached to the diaphragms 41 and 43 in such a direction that the web 45w and side reinforcing plate 45s of the diagonal beam 45 are flush with the reinforcing plates P3 and P4.

[0029] The splice plate S2a is disposed across the upper surface of the upper flange 45a of the diagonal beam 45 and the upper surface of the diaphragm 41. The splice plate S2b is disposed across the lower surface of the lower flange 45b of the diagonal beam 45 and the lower surface of the diaphragm 43.

[0030] Furthermore, splice plate S4a is arranged to extend across the lower surface of the upper flange 45a of the diagonal beam 45 and the lower surface of the diaphragm 41. Furthermore, splice plate S4b is arranged to extend across the upper surface of the lower flange 45b of the diagonal beam 45 and the upper surface of the diaphragm 43. These splice plates S4a and S4b have a width approximately half that of splice plates S2a and S2b, and are arranged two by two, with the web 45w of the diagonal beam 45 sandwiched between them.

[0031] Then, with the engagement holes formed in the splice plates S2a, S2b, S4a, and S4b aligned with the engagement holes formed in the diagonal beam 45 and diaphragms 41 and 43, nuts (not shown) are screwed onto the bolts 68 that are passed through these engagement holes.

[0032] (Construction method of building support structure 10) Next, a method for constructing the building support structure 10 having the above-described configuration will be described. First, columns 11, 12, 15, 16, 17, and 18 are erected, and beams B1 to B3, main girder 21, and sub-girders 13, 14, 19, 20, and 22 to 29 are attached. Here, main girder 21 is formed by joining multiple steel beams. Then, the steel beams on the column 11 side that constitute main girder 21 are joined using diaphragms 41 and 43 and splice plate S1. Furthermore, the cantilever beam 35 is joined to the girder 21 by welding.

[0033] Next, the cantilever beam 31 is joined to the column 11 by attaching the main body portion 31b to the beam end portion 31a of the cantilever beam 31, which has been welded to the diaphragms 41, 43 in advance at a factory or the like. Then, one end of the diagonal beam 45 is joined to the diaphragms 41 and 43 of the column 11 using splice plates S2a, S2b, S4a, and S4b, bolts 68, and nuts. Furthermore, the web 45w at the other end of the diagonal beam 45 and the side reinforcing plate 45s on the indoor side are welded to the cantilever beam 35. Thereafter, a beam 33 is welded to the tip of the cantilever beam 31. Furthermore, this beam 33 is welded to the tip of the cantilever beam 35 and the side reinforcing plate 45s on the exterior side of the other end of the diagonal beam 45.

[0034] (Operation of the embodiment) The tip of the cantilever beam 35 (36) protruding from the girder 21 connecting the columns 11 and 12 to the outside of the room is connected to the column 11 (12) by the diagonal beam 45 (46). As a result, the load applied to the tip of the cantilever beam 35 (36) is distributed and supported in the extension direction of the girder 21 via the diagonal beam 45.

[0035] According to this embodiment, the following effects can be obtained. (1) In this embodiment, a diagonal beam 45 is provided that connects the tip of a cantilever beam 35 that protrudes outside the room from a girder 21 that connects the column 11 and the column 12 to the column 11. As a result, the load applied to the tip of the cantilever beam 35 is supported not only by the girder 21 but also by the column 11 via the diagonal beam 45. In this way, the load applied to the tip of the diagonal beam 45 is distributed by being transmitted not only in the extension direction of the cantilever beam 35 but also in the extension direction of the girder 21 that is perpendicular to the extension direction. Therefore, deflection at the tip of the cantilever beam 35 can be reduced.

[0036] (2) In this embodiment, one end of the diagonal beam 45 is joined to the intersection of the beam 33 and the cantilever beam 35. This beam 33 is also joined to the tip of the cantilever beam 31 joined to the column 11. This allows the load applied to the tip of the cantilever beam 35 to be supported also via the beam 33 and the cantilever beam 35.

[0037] (3) In this embodiment, the diaphragms 41 and 43 provided on the pillar 11 are connected to the diagonal beam 45. This allows the pillar 11 to efficiently support the diagonal beam 45 via the diaphragms 41 and 43.

[0038] (4) In this embodiment, the diaphragms 41, 43 of the column 11 are provided with reinforcing plates P3, P4 that are aligned with the web 45w of the diagonal beam 45 and the side reinforcing plate 45s on the exterior side. This allows the diaphragms 41, 43 to reinforce the exterior side.

[0039] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, the building support structure 10 has been described as having a bilaterally symmetrical structure with respect to the center line C1. However, the building support structure 10 according to the present invention is not limited to a bilaterally symmetrical structure and may be used in an asymmetrical structure. Furthermore, although the building support structure 10 uses the diagonal beams 45, 46 symmetrically, the number of diagonal beams is not particularly limited, and a configuration having only one diagonal beam 45 may be used.

[0040] In the above embodiment, the diagonal beam 45 is joined to the cantilever beam 35 extending from the column 11 and to the beam 33 joined to this cantilever beam 35. However, it is sufficient that the diagonal beam 45 is joined to at least the tip of the cantilever beam 35, and it does not have to be supported by the beam 33 extending in a direction perpendicular to the cantilever beam 35.

[0041] In the above embodiment, the diagonal beam 45 is connected to the tip of the cantilever beam 35 which is cantilevered to the main girder 21 which connects the columns 11 and 12. Alternatively, the diagonal beam may be arranged to connect the tip of a cantilever beam which is cantilevered from a second column (column 12) which is provided at a distance from the first column (column 11 in the embodiment) to the first column.

[0042] In the above embodiment, the cantilever beam 35 is attached to the girder 21, and the cantilever beam 31 is attached to the column 11 via the diaphragms 41, 43. Then, one end of the diagonal beam 45 is attached to the diaphragms 41, 43, and then the other end of the diagonal beam 45 is attached to the cantilever beam 35. After that, the beam 33 is attached to the cantilever beams 31, 35, and the diagonal beam 45 is attached to the beam 33. In this way, instead of attaching the girder 21, cantilever beams 31, 35, diagonal beams 45, and beam 33 sequentially on site, some of these may be constructed as an integrated unit in a factory, etc., and then this unit may be attached on site. For example, the main body 31b of the cantilever beam 31, the cantilever beam 35, the portion of the beam 33 between the cantilevers 31 and 35, and the diagonal beam 45 may be configured as a single unit. In this case, the other end of the diagonal beam 45 can be pre-welded to the intersection of the cantilever beam 35 and the beam 33 in a factory or the like. To install this unit, the end of the cantilever beam 35 of the unit is joined to the main girder 21, and the main body 31b including the tip of the cantilever beam 31 of the unit is joined to the beam end 31a joined to the diaphragms 41 and 43. Furthermore, one end of the diagonal beam 45 is joined to the diaphragms 41 and 43. This allows the diagonal beam 45 to be installed by joining the unit to the cantilever beam 31, the main girder 21, and the diaphragms 41 and 43 using splice plates, bolts, and nuts. This allows the diagonal beam 45 to be installed efficiently on-site. Since the above-described unit includes the entire cantilever 35, the end of the cantilever 35 of the unit is joined to the girder 21. Alternatively, the unit may be configured to include a portion of the cantilever 35, and the portion of the cantilever 35 may be joined to the girder 21 in advance, so that the unit is joined midway along the cantilever 35.

[0043] In the above embodiment, the tip of the diagonal beam 45 is positioned closer to the center line C1 than the columns 11, 15, 17 (12, 16, 18) of the building's support structure 10. However, the placement of these columns is not limited to the placement shown in the embodiment, and they may be placed in a building where columns exist at the intersections of the main beam 21, the sub-beam 22, and the cantilever beam 35 (36) and the sub-beam 27 (28), for example. However, in a building support structure 10 configured as in the above embodiment where there are no columns supporting a load near the tip of the diagonal beam 45, the use of the above-described diagonal beam 45 can efficiently suppress deflection of the cantilever beam.

[0044] In the above embodiment, the diagonal beam 45 is connected to the column 11 and the cantilever beam 35 that protrudes outside the building from the main girder 21 that is connected to the column 11. The diagonal beam may be connected to the tip of a cantilever beam that protrudes from a secondary beam, or may be connected to the tip of a cantilever beam that protrudes inside the building, for example, in the building's courtyard. In the above embodiment, the support structure 10 for the building was described using square steel pipe columns and H-shaped steel beams. However, the columns and beams used in the support structure for the building described above are not limited to square steel pipes and steel beams. For example, the present invention may be applied to a building using columns and beams made of reinforced concrete, or to a building with reinforced concrete columns and steel beams.

[0045] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (a) The support structure of a building described in claim 3, characterized in that the diaphragm has a polygonal shape having a first beam-corresponding side perpendicular to the extension direction of the connecting beam and a second beam-corresponding side perpendicular to the extension direction of the diagonal beam.

[0046] (b) one end of the second cantilever beam is welded to the first column; the diagonal beam is formed as a unit integrated with at least a portion of the outer joint beam, the tip of the first cantilever beam, and the tip of the second cantilever beam; The first column side end of the diagonal beam in the unit is joined to the diaphragm, A support structure for a building according to any one of claims 1 to 3 or (a), characterized in that the tip of a first cantilever in the unit is joined to the main body of the first cantilever, and the second cantilever in the unit is joined to one end of the second cantilever of the first column. [Explanation of symbols]

[0047] B1, B2, B3... Beam, C1... Center line, P1, P2, P3, P4... Reinforcement plate, S1, S2a, S2b, S4a, S4b, 61, 63... Splice plate, 10... Support structure, 11... Column (first column), 12... Column (second column), 15, 16, 17, 18... Column, 13, 14, 19, 20, 22, 23, 24, 25, 26, 27, 28, 29... Sub-beam, 21... Main beam (connecting beam), 21R, 35R... Reinforcement plate, 21d... Bottom flange, 2 1t...upper flange, 21s, 45s...side reinforcement plate, 21w, 35w, 45w...web, 31, 32...cantilever beam (second cantilever beam), 31a...beam end, 31b...main body, 33...beam (outer joint beam), 35, 36...cantilever beam (first cantilever beam), 41, 42, 43...diaphragm, 41a, 41b, 41c...beam corresponding edge, 45, 46...diagonal beam, 45a...upper flange, 45b...lower flange, 62, 64, 66, 68...bolts.

Claims

1. a connecting beam that joins the first column and the second column; a first cantilever beam joined to the connecting beam or the second column in a cantilever manner; A building support structure comprising: a diagonal beam connected to the first column and the tip of the first cantilever beam.

2. a second cantilever beam cantilevered to the first column; an outer joining beam that joins a tip of the first cantilever beam and a tip of the second cantilever beam, The building support structure according to claim 1, wherein the tip of the diagonal beam is connected to the first cantilever beam and the outer connecting beam.

3. 3. The building support structure according to claim 1, wherein the first column is provided with a diaphragm that connects the connecting beam and the diagonal beam.

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