structures

Abstract

To reduce a deflection amount of a steel beam while suppressing lowering of designability when being looked up and lowering of workability.SOLUTION: A structure 10 includes: a pair of columns 22; a pair of jump-out steel beams 30 whose each of ends are rigidly joined to the columns 22; a pair of first orthogonal jump-out steel beams 40 for jumping out to one side in an orthogonal direction orthogonal to the jump-out steel beams from each of the pair of columns; a pair of second orthogonal jump-out steel beams 42 for jumping out to the other side in the orthogonal direction from each of the pair of columns; a one side steel beam 50 which is installed in the pair of first orthogonal jump-out steel beams, and have ends pin-joined to the first orthogonal jump-out steel beams; an other side steel beam 52 which is installed in the pair of second orthogonal jump-out steel beams and have ends pin-joined to the second orthogonal jump-out steel beams 42; and a pair of connection steel beams 32 which are provided on each tip in the jump-out direction of the jump-out steel beams, are installed in the one side steel beam and the other side steel beam, and have ends pin-joined to the one side steel beam and the other side steel beam.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] A plurality of beams are known that are installed in parallel on adjacent pillars (see, for example, Patent Documents 1 to 3). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-248760 [Patent Document 2] Japanese Patent Application Publication No. 5-133002 [Patent Document 3] Japanese Patent Application Laid-Open No. 2008-031644 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, in an elevated structure such as a pedestrian deck, a slab is provided on a plurality of columns arranged in a row and steel beams erected on adjacent columns.

[0005] Here, for example, in the case of a bracket-type steel beam, in order to resist horizontal forces during an earthquake, the end of the bracket that protrudes from the joint of the column and the end of the steel beam body are rigidly joined at the site using bolts and nuts.

[0006] Specifically, the bracket and the web of the steel beam are bolted together via a splice plate, and the upper flanges of the bracket and the steel beam are bolted together via a splice plate, and the lower flanges of the bracket and the steel beam are bolted together via a splice plate.

[0007] However, in this case, when looking up at the joint between the bracket and the steel beam body, the bolts or nuts are visible, which may reduce the design appeal.

[0008] One possible solution to this problem is to weld the lower flanges of the bracket and the steel beam body together, but this could result in reduced workability.

[0009] In consideration of the above facts, the present invention aims to provide a structure that can resist horizontal forces during an earthquake while suppressing a decrease in design when viewed from above and a decrease in workability. [Means for solving the problem]

[0010] According to the first aspect The structure comprises a pair of opposing columns, a pair of protruding steel beams that protrude from the pair of columns toward each other and have their ends rigidly connected to the columns, a pair of first orthogonal protruding steel beams that protrude from each of the pair of columns to one side in an orthogonal direction perpendicular to the protruding steel beams, a pair of second orthogonal protruding steel beams that protrude from each of the pair of columns to the other side in the orthogonal direction, a first-side steel beam that is erected on the pair of first orthogonal protruding steel beams and has its ends pin-connected to the first orthogonal protruding steel beams, a second-side steel beam that is erected on the pair of second orthogonal protruding steel beams and has its ends pin-connected to the second orthogonal protruding steel beams, and a pair of connecting steel beams that are respectively provided at the tips of the pair of protruding steel beams in the protruding direction, erected on the first-side steel beam and the other-side steel beam, and has its ends pin-connected to the first-side steel beam and the other-side steel beam.

[0011] First aspect The structure according to the present invention comprises a pair of columns, a pair of projecting steel beams, a pair of first orthogonal projecting steel beams, a pair of second orthogonal projecting steel beams, one side steel beam, the other side steel beam, and a connecting steel beam.

[0012] The pair of columns face each other, and the pair of protruding steel beams protrude from the pair of columns toward each other, and are rigidly connected at their ends to the pair of columns.

[0013] A pair of first orthogonal spring-out steel beams spring out from each of the pair of columns to one side in an orthogonal direction perpendicular to the spring-out steel beams, and a pair of second orthogonal spring-out steel beams spring out from each of the pair of columns to the other side in the orthogonal direction.

[0014] The steel beams on one side are erected on a pair of first orthogonal spring-out steel beams, and each end is pin-joined to the first orthogonal spring-out steel beams. The steel beams on the other side are erected on a pair of second orthogonal spring-out steel beams, and each end is pin-joined to the second orthogonal spring-out steel beams.

[0015] The connecting steel beams are provided at the tip ends of the pair of protruding steel beams in the protruding direction, and are erected between the one side steel beam and the other side steel beam, with their ends pin-joined to the one side steel beam and the other side steel beam, respectively.

[0016] As mentioned above, the steel beam on one side is connected to the first orthogonal protruding steel beam and the connecting steel beam by pins, so there are no bolts connecting their respective lower flanges. Similarly, the steel beam on the other side is connected to the second orthogonal protruding steel beam and the connecting steel beam by pins, so there are no bolts connecting their respective lower flanges. This improves the design when looking up at the steel beam on one side and the steel beam on the other side.

[0017] Furthermore, in the present invention, deterioration in workability is suppressed compared to when the lower flange portion of the steel beam on one side is welded to the lower flange portions of the first orthogonal protruding steel beam and the connecting steel beam. Similarly, in the present invention, deterioration in workability is suppressed compared to when the lower flange portion of the steel beam on the other side is welded to the lower flange portions of the second orthogonal protruding steel beam and the connecting steel beam.

[0018] Furthermore, the end of the steel beam on one side is supported at two points: the first orthogonal projecting steel beam and the connecting steel beam. This allows the bending moment to be transmitted between the column and the steel beam on one side, thereby reducing the deflection of the steel beam on one side.

[0019] Similarly, the end of the other steel beam is supported by two points: the second orthogonal projecting steel beam and the connecting steel beam. This allows the bending moment to be transmitted between the column and the other steel beam, thereby reducing the deflection of the other steel beam.

[0020] In this way, the present invention can reduce the amount of deflection of the steel beams on one side and the steel beams on the other side while suppressing a decrease in design when viewed up and a decrease in workability.

[0021] According to the second aspect The structure is According to the first aspect The structure includes a slab that spans the one-side steel beam and the other-side steel beam, with both ends projecting outward from the one-side steel beam and the other-side steel beam, respectively.

[0022] Second aspect In the structure described above, the slab spans between the steel beams on one side and the steel beams on the other side. The ends of the slab extend outward from the steel beams on one side and the steel beams on the other side, respectively. This slab can provide, for example, a wide passageway.

[0023] Furthermore, as mentioned above, by supporting the end of the steel beam on one side at two points, the first orthogonal projecting steel beam and the connecting steel beam, torsional deformation of the steel beam on one side due to the weight of the slab is suppressed. Similarly, by supporting the end of the steel beam on the other side at two points, the second orthogonal projecting steel beam and the connecting steel beam, torsional deformation of the steel beam on the other side due to the weight of the slab is suppressed. Therefore, the slab is stabilized.

[0024] According to the third aspect The structure is First aspect or According to the second aspectIn the structure, three or more of the columns are arranged in the opposing direction, and adjacent pairs of the columns are each provided with a pair of protruding steel beams that protrude toward each other, and the tips of the pair of protruding steel beams are each provided with a connecting steel beam that is erected between the steel beam on one side and the steel beam on the other side.

[0025] Third aspect According to the structure described above, three or more columns are arranged in opposing directions. A pair of protruding steel beams that protrude toward each other are provided on each pair of adjacent columns. A connecting steel beam is provided at the tip of each protruding steel beam in the protruding direction. Each connecting steel beam is installed between one steel beam and the other steel beam.

[0026] By arranging three or more pillars in this manner, it is possible to easily secure an elevated structure of a predetermined length. [Effects of the Invention]

[0027] As described above, according to the present invention, it is possible to reduce the amount of deflection of steel beams while suppressing deterioration in the design when viewed from above and deterioration in workability. [Brief explanation of the drawings]

[0028] [Figure 1] FIG. 1 is a plan view illustrating a structure according to an embodiment. [Figure 2] FIG. 2 is an enlarged plan view of the structure shown in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 2. [Figure 5] FIG. 5 is a cross-sectional view taken along line 5-5 in FIG. 2. [Figure 6] FIG. 10 is a plan view showing a structure according to a comparative example. [Figure 7] FIG. 7 is a side view showing the joint between the bracket and the steel beam body shown in FIG. 6. DETAILED DESCRIPTION OF THE INVENTION

[0029] Hereinafter, a structure according to one embodiment will be described with reference to the drawings.

[0030] (structure) 1 shows a structure 10 according to this embodiment. As an example, the structure 10 is an elevated structure (elevated walkway) such as a pedestrian deck. In plan view, the structure 10 is formed in a rectangular shape with a predetermined direction as its longitudinal direction.

[0031] In addition, the arrow X shown in each drawing indicates the longitudinal direction of the structure 10, and the arrow Y indicates the width direction of the structure 10.

[0032] (frame) The structure 10 includes a plurality of frames 20 and a slab 60. In one example, the plurality of frames 20 are arranged along the longitudinal direction of the structure 10. Each frame 20 includes a pair of columns 22, a pair of cantilever steel beams 30, a first orthogonal cantilever steel beam 40, a second orthogonal cantilever steel beam 42, a one-side steel beam 50, an other-side steel beam 52, and a pair of connecting steel beams 32.

[0033] (pillar) The pair of columns 22 are made of steel, reinforced concrete, steel-reinforced concrete, or CFT, and face each other in the longitudinal direction (arrow X direction) of the structure 10. The multiple columns 22 that make up each frame 20 are arranged in a row in the longitudinal direction of the structure 10. A protruding steel beam 30, a first orthogonal protruding steel beam 40, and a second orthogonal protruding steel beam 42 are provided at the joints of each column 22.

[0034] (protruding steel beam) 2, the pair of protruding steel beams 30 are formed of H-shaped steel. The pair of protruding steel beams 30 are arranged along the opposing direction of the pair of columns 22, and protrude from each other from the pair of columns 22. One end (base end) of each protruding steel beam 30 is rigidly connected to the joint of the column 22 by welding or the like.

[0035] 3, the protruding steel beam 30 has an upper flange portion 30A and a lower flange portion 30B that face each other in the vertical direction, and a web portion 30C that connects the upper flange portion 30A and the lower flange portion 30B. The beam depth of this protruding steel beam 30 is set higher than the beam depths of a first steel beam 50 and an second steel beam 52, which will be described later.

[0036] The total length of the pair of protruding steel beams 30 is, for example, 1 / 5 to 1 / 3 of the span L (see FIG. 1) of the pair of columns 22. A connecting steel beam 32, which will be described later, is provided at the tip end 30T (see FIG. 2) of the protruding steel beam 30.

[0037] (First orthogonal protruding steel beam) As shown in Fig. 2, the pair of first orthogonal spring-out steel beams 40 are formed of H-shaped steel. The pair of first orthogonal spring-out steel beams 40 are cantilever beams that spring out from each of the pair of columns 22 to one side in the orthogonal direction (arrow Y direction) perpendicular to the spring-out steel beam 30. One end (base end) of each first orthogonal spring-out steel beam 40 is rigidly joined to the joints of the pair of columns 22 by welding or the like. A one-side steel beam 50, which will be described later, is erected on the pair of first orthogonal spring-out steel beams 40.

[0038] In addition, the perpendicular direction perpendicular to the protruding steel beam 30 is a concept that includes not only a direction strictly perpendicular to the material axis direction of the protruding steel beam 30, but also a direction that deviates from that direction due to construction errors, etc.

[0039] (Second orthogonal projecting steel beam) The pair of second orthogonal protruding steel beams 42 are formed of H-shaped steel. The pair of second orthogonal protruding steel beams 42 are cantilever beams that protrude from each of the pair of columns 22 to one side in the orthogonal direction (direction of arrow Y) perpendicular to the protruding steel beam 30. One end (base end) of each first orthogonal protruding steel beam 40 is rigidly joined to the joint of the column 22 by welding or the like. A steel beam 52 on the other side, which will be described later, is erected on the pair of second orthogonal protruding steel beams 42.

[0040] The total length of the first orthogonal spring-out steel beam 40 and the second orthogonal spring-out steel beam 42 is preferably equal to or shorter than the total length of the spring-out steel beam 30, and more preferably equal to or shorter than 2 / 3 of the total length of the spring-out steel beam 30.

[0041] (Steel beam on one side) The one-side steel beam 50 is formed of an H-shaped steel. The one-side steel beam 50 is disposed between the tips of the pair of first orthogonal protruding steel beams 40 in the protruding direction, along the opposing direction of the pair of columns 22 (the direction of arrow X).

[0042] The one-side steel beam 50 is erected at the tip of a pair of first orthogonal spring-out steel beams 40. Ends 50E on both sides of this one-side steel beam 50 are pin-joined to the tip of the first orthogonal spring-out steel beam 40 with bolts and nuts (not shown).

[0043] The joint structure between the end 50E of the one-side steel beam 50 and the tip of the first orthogonal protruding steel beam 40 is similar to the joint structure between one end 32E1 of the connecting steel beam 32 described later and the middle part of the one-side steel beam 50 (see Figure 5).

[0044] As shown in Figure 3, one side steel beam 50 has an upper flange portion 50A and a lower flange portion 50B that face each other in the vertical direction, and a web portion 50C that connects the upper flange portion 50A and the lower flange portion 50B.

[0045] (Steel beam on the other side) 2, the other-side steel beam 52 is formed of an H-shaped steel. The other-side steel beam 52 is disposed along the opposing direction of the pair of columns 22 between the tips of the pair of first orthogonal protruding steel beams 40 in the protruding direction.

[0046] The other-side steel beam 52 is erected at the tip ends of the pair of first orthogonal spring-out steel beams 40. Specifically, both end portions 52E of the other-side steel beam 52 are pin-joined to the tip ends of the first orthogonal spring-out steel beams 40 with bolts and nuts (not shown).

[0047] The joint structure between the end 52E of the other steel beam 52 and the tip of the second orthogonal protruding steel beam 42 is similar to the joint structure between one end 32E1 of the connecting steel beam 32 described later and the middle part of the one steel beam 50 (see Figure 5).

[0048] As shown in Figure 3, the other steel beam 52 has an upper flange portion 52A and a lower flange portion 52B that face each other in the vertical direction, and a web portion 52C that connects the upper flange portion 52A and the lower flange portion 52B.

[0049] (Connected steel beams) 2, the connecting steel beam 32 is formed of an H-shaped steel. The connecting steel beam 32 is disposed between the one-side steel beam 50 and the other-side steel beam 52 along a direction perpendicular to the protruding steel beam 30 (the direction of arrow Y).

[0050] 4, the connecting steel beam 32 has an upper flange portion 32A and a lower flange portion 32B that face each other in the vertical direction, and a web portion 32C that connects the upper flange portion 32A and the lower flange portion 32B. The connecting steel beam 32 is rigidly joined to the center portion in the material axis direction of the connecting steel beam 32 at the tip end 30T of the protruding steel beam 30 in the protruding direction.

[0051] Specifically, the beam structure of the connecting steel beams 32 is substantially the same as the beam structure of the protruding steel beams 30. The tip of the upper flange portion 30A of the protruding steel beam 30 is welded to one side end of the upper flange portion 32A of this connecting steel beam 32 in a butting state. Similarly, the tip of the lower flange portion 30B of the protruding steel beam 30 is welded to one side end of the lower flange portion 32B of the connecting steel beam 32 in a butting state.

[0052] Additionally, the end of the web portion 30C of the protruding steel beam 30 is welded in a butted state to the web portion 32C of the connecting steel beam 32. This rigidly joins the center of the connecting steel beam 32 and the tip end 30T of the protruding steel beam 30.

[0053] 5, one end 32E1 of the connecting steel beam 32 is pin-joined to the middle portion of the one-side steel beam 50. Specifically, a gusset plate 34 is provided in the middle portion of the one-side steel beam 50. The gusset plate 34 is disposed between the upper flange portion 50A and the lower flange portion 50B of the one-side steel beam 50, and is welded in a butted state to the upper flange portion 50A, the lower flange portion 50B, and the web portion 50C.

[0054] The gusset plate 34 protrudes toward the connecting steel beam 32 from between the upper flange portion 50A and the lower flange portion 50B of the one-side steel beam 50. The tip of this gusset plate 34 in the protruding direction is joined to the web portion 32C of the connecting steel beam 32 with a bolt 36 and a nut (not shown) in a state where it is overlapped with the web portion 32C of the connecting steel beam 32. As a result, one end portion 32E1 of the connecting steel beam 32 and the middle portion of the one-side steel beam 50 are pin-joined.

[0055] 2, the end 50E side of the one-side steel beam 50 is supported at two points: the tip end of the first orthogonal protruding steel beam 40 and one end 32E1 of the connecting steel beam 32. A planar frame is formed by the protruding steel beam 30, the first orthogonal protruding steel beam 40, the one-side steel beam 50, and the connecting steel beam 32. This planar frame is formed in a rectangular shape with the opposing direction of the pair of columns 22 as the longitudinal direction.

[0056] The other end 32E2 of the connecting steel beam 32 is pin-joined to the middle portion of the other-side steel beam 52. The joint structure between the other end 32E2 of the connecting steel beam 32 and the middle portion of the other-side steel beam 52 is the same as the joint structure between the one end 32E1 of the connecting steel beam 32 and the middle portion of the one-side steel beam 50 (see FIG. 5).

[0057] Here, the end 52E side of the other-side steel beam 52 is supported at two points: the tip end of the second orthogonal protruding steel beam 42 and the other end 32E2 of the connecting steel beam 32. A planar frame is formed by the protruding steel beam 30, the second orthogonal protruding steel beam 42, the other-side steel beam 52, and the connecting steel beam 32. This planar frame is formed in a rectangular shape with the opposing direction of the pair of columns 22 as the longitudinal direction.

[0058] The connecting steel beams 32, the protruding steel beams 30, and the columns 22 are joined (integrated) in advance in a factory, a site yard, or the like.

[0059] Here, the "pin joint" in this embodiment is not limited to a configuration in which the web portion of one steel beam is joined to the web portion of another steel beam, and the upper and lower flange portions of the one steel beam are not joined to the upper and lower flange portions of the other steel beam. The "pin joint" in this embodiment is a concept that also includes, for example, a configuration in which the web portion and upper flange portion of one steel beam are joined to the web portion and upper flange portion of another steel beam, respectively, and the lower flange portion of the one steel beam is not joined to the lower flange portion of the other steel beam.

[0060] Therefore, for example, when one end 32E1 of the connecting steel beam 32 and the middle portion of the steel beam 50 on one side are pin-joined, as shown in FIG. 5 , this concept includes not only a configuration in which the web portion 32C of the connecting steel beam 32 is joined to the web portion 50C of the steel beam 50 on one side, and the upper flange portion 32A and the lower flange portion 32B of the connecting steel beam 32 are not joined to the upper flange portion 50A and the lower flange portion 50B of the steel beam 50 on one side, but also a configuration in which the upper flange portion 32A and the web portion 32C of the connecting steel beam 32 are joined to the upper flange portion 50A and the web portion 50C of the steel beam 50 on one side, respectively, and the lower flange portion 32B of the connecting steel beam 32 is not joined to the lower flange portion 50B of the steel beam 50 on one side.

[0061] (Slab) As shown in Fig. 1, the slab 60 is made of reinforced concrete. This slab 60 is provided along the multiple frames 20 and forms the floor of the structure 10. The slab 60 spans the steel beams 50 on one side and the steel beams 52 on the other side of each frame 20, with both ends 60E of the slab 60 projecting outward (outward in the direction of arrow Y) from the steel beams 50 on one side and the steel beams 52 on the other side, respectively. The center of the width of the slab 60 is supported by the multiple frames 20.

[0062] (action) Next, the operation of this embodiment will be described.

[0063] First, a structure according to a comparative example will be described. Fig. 6 shows a structure (elevated structure) 100 according to the comparative example. In this structure 100, a steel beam (steel girder) 110 is erected on a pair of columns 22. The steel beam 110 is of a bracket type, and includes a pair of brackets 120 and a steel beam body 130.

[0064] One end of each bracket 120 is rigidly joined to the joint of the column 22 at a factory or the like. The other end of this bracket 120 is rigidly joined to the end of the steel beam main body 130 with a bolt and a nut, for example, at the construction site.

[0065] Specifically, as shown in FIG. 7, the bracket 120 and the web portions 120C, 130C of the steel beam main body 130 are joined together via a splice plate 140 by bolts 142 and nuts (not shown).

[0066] Furthermore, the upper flange portions 120A, 130A of the bracket 120 and the steel beam main body 130 are joined together by bolts 142 and nuts 144 via a splice plate 140, and the lower flange portions 120B, 130B of the bracket 120 and the steel beam main body 130 are joined together by bolts 142 and nuts 144 via a splice plate 140. This reduces the amount of deflection of the steel beam 110.

[0067] However, in this case, when looking up at the joint between the bracket 120 and the steel beam main body 130, the bolt 142 and nut 144 are visible, which may reduce the aesthetic appeal.

[0068] One possible solution to this problem is to weld the lower flanges 120B, 130B of the bracket 120 and the steel beam body 130 together, but this could reduce workability. Also, for example, if the bracket 120 and the steel beam body 130 are made of hot-dip galvanized steel, the touch-up portion of the welded joint could easily rust and become soiled.

[0069] In contrast to this, in this embodiment, as shown in Fig. 2, a pair of opposing columns 22 are provided with a pair of protruding steel beams 30. The pair of protruding steel beams 30 protrude from the pair of columns 22 toward each other, and their ends (base ends) are rigidly joined to the pair of columns 22. Connecting steel beams 32 are provided at tip ends 30T of the pair of protruding steel beams 30.

[0070] The connecting steel beam 32 is erected between the one-side steel beam 50 and the other-side steel beam 52. Here, as shown in Fig. 5 , one end 32E1 of the connecting steel beam 32 is pin-joined to the middle part of the one-side steel beam 50. Therefore, there are no bolts joining the lower flange portions 32B, 50B of the connecting steel beam 32 and the one-side steel beam 50 to each other.

[0071] Similarly, the other end 32E2 of the connecting steel beam 32 is pin-joined to the middle portion of the other-side steel beam 52. Therefore, there are no bolts joining the lower flange portions 32B, 52B of the connecting steel beam 32 and the other-side steel beam 52 to each other.

[0072] Furthermore, the tip end of the first orthogonal spring-out steel beam 40 and the end 50E of the one-side steel beam 50 are joined by a pin. Therefore, there are no bolts joining the lower flange portions of the first orthogonal spring-out steel beam 40 and the one-side steel beam 50 together.

[0073] Similarly, a pin is connected between the tip end of the second orthogonal protruding steel beam 42 and the end 52E of the other-side steel beam 52. Therefore, there are no bolts connecting the lower flange portions of the second orthogonal protruding steel beam 42 and the other-side steel beam 52 to each other.

[0074] Therefore, in this embodiment, the design is improved when looking up at the one-side steel beam 50 and the other-side steel beam 52.

[0075] Furthermore, in this embodiment, compared to welding the lower flange portions 32B, 50B of the connecting steel beam 32 and the one-side steel beam 50 together, and the lower flange portions 32B, 52B of the connecting steel beam 32 and the other-side steel beam 52 together, deterioration in workability is suppressed and contamination due to rust is suppressed.

[0076] Similarly, in this embodiment, compared to welding the lower flange portions of the first orthogonal protruding steel beam 40 and the one-side steel beam 50 together, and the lower flange portions of the second orthogonal protruding steel beam 42 and the other-side steel beam 52 together, deterioration in workability is suppressed and contamination due to rust is suppressed.

[0077] Furthermore, the end 50E side of the one-side steel beam 50 is supported at two points: the first orthogonal projecting steel beam 40 and the connecting steel beam 32. This allows the bending moment to be transmitted between the column 22 and the one-side steel beam 50. Therefore, the amount of deflection of the one-side steel beam 50 is reduced.

[0078] Similarly, the end 52E side of the other-side steel beam 52 is supported at two points: the second orthogonal projecting steel beam 42 and the connecting steel beam 32. This allows the bending moment to be transmitted between the column 22 and the other-side steel beam 52. Therefore, the amount of deflection of the other-side steel beam 52 is reduced.

[0079] In this manner, in this embodiment, the amount of deflection of the one-side steel beam 50 and the other-side steel beam 52 can be reduced while suppressing degradation of the design when viewed up and degradation of workability.

[0080] The slab 60 spans the steel beam 50 on one side and the steel beam 52 on the other side. Ends 60E on both sides of the slab 60 protrude outward from the steel beam 50 on one side and the steel beam 52 on the other side, respectively. The slab 60 can provide, for example, a wide passageway.

[0081] Furthermore, as mentioned above, by supporting the end 50E side of the one-side steel beam 50 at two points, the tip of the first orthogonal protruding steel beam 40 and one end 32E1 of the connecting steel beam 32, torsional deformation of the one-side steel beam 50 due to the weight of the slab 60 is suppressed.

[0082] Similarly, by supporting the end 52E side of the other-side steel beam 52 at two points, the tip end of the second orthogonal projecting steel beam 42 and the other end 32E2 of the connecting steel beam 32, torsional deformation of the other-side steel beam 52 due to the load of the slab 60 is suppressed, and the slab 60 is therefore stabilized.

[0083] Furthermore, in this embodiment, by arranging multiple frames 20 in a row in a predetermined direction, i.e., by arranging three or more pillars 22 in a row in a predetermined direction, an elevated structure (elevated passage) or the like of a predetermined length can be easily formed.

[0084] (Variation) Next, a modification of the above embodiment will be described.

[0085] In the above embodiment, the one-side steel beam 50 is installed at the tip end of the pair of first orthogonal spring-out steel beams 110. However, the one-side steel beam 50 is not limited to being installed at the tip end of the pair of first orthogonal spring-out steel beams 110, and may be installed at an intermediate portion in the projection direction of the pair of first orthogonal spring-out steel beams 110. Similarly, the other-side steel beam 52 may be installed at an intermediate portion in the projection direction of the pair of second orthogonal spring-out steel beams 42.

[0086] In the above embodiment, the ends 60E on both sides of the slab 60 protrude outward from the one-side steel beam 50 and the other-side steel beam 52. However, the ends 60E on both sides of the slab 60 do not have to protrude outward from the one-side steel beam 50 and the other-side steel beam 52.

[0087] In addition, in the above embodiment, a plurality of frames 20 are arranged in a row. However, it is sufficient to have at least one frame 20. In addition, the above embodiment is not limited to an elevated structure, and can be appropriately applied to other structures.

[0088] Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and one embodiment and various modified examples may be used in appropriate combination, and it goes without saying that the present invention can be implemented in various forms as long as it does not deviate from the gist of the present invention. [Explanation of symbols]

[0089] 10 Structures 22 pillars 30 Casting steel beam 30T Protruding steel beam tip 32 Connected steel beams 32E1 One end of connecting steel beam 32E2 Other end of connecting steel beam 40 First orthogonal protruding steel beam 42 Second orthogonal projecting steel beam 50 One side steel beam 50E End of one side steel beam 52 Other side steel beam 52E End of the other steel beam 60 Slabs 60E Both ends of the slab

Claims

1. A pair of opposing pillars; a pair of protruding steel beams that protrude from the pair of columns toward each other and have their ends rigidly connected to the columns; A pair of first orthogonal spring-out steel beams springing out from each of the pair of columns to one side in an orthogonal direction perpendicular to the spring-out steel beams; A pair of second orthogonal spring-out steel beams springing out from each of the pair of columns to the other side in the orthogonal direction; a first steel beam that is erected on the pair of first orthogonal spring-out steel beams and has ends that are pin-connected to the first orthogonal spring-out steel beams; an other-side steel beam that is erected on the pair of second orthogonal spring-out steel beams and has ends that are pin-joined to the second orthogonal spring-out steel beams; a pair of connecting steel beams that are respectively provided at the tip ends of the pair of protruding steel beams in the protruding direction, that are spanned between the one-side steel beam and the other-side steel beam, and that have their ends pin-connected to the one-side steel beam and the other-side steel beam; Equipped with Three or more of the pillars are arranged in the opposing direction, A pair of the adjacent columns is provided with a pair of the protruding steel beams that protrude toward each other, The connecting steel beams are provided at the tip portions of the pair of protruding steel beams, respectively, and are installed between the one-side steel beam and the other-side steel beam. structure.

2. a slab that spans the one-side steel beam and the other-side steel beam, and has both ends that protrude outward from the one-side steel beam and the other-side steel beam, The structure of claim 1 .

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