Architecture Construction

Abstract

This provides a rational frame structure that allows for appropriate force transmission between the upper inclined column and beam, and between the lower inclined column and beam. [Solution] In a frame structure formed by joining a beam B and inclined columns P that are inclined in a direction intersecting the extending direction of beam B in a plan view, the inclined columns P consist of an upper inclined column PU positioned on the upper side of beam B and a lower inclined column PL positioned on the lower side of beam B, and the upper inclined column PU and the lower inclined column PL are inclined in the same direction, and their respective column axes Pc are misaligned in the beam width direction of beam B, and are joined to the upper or lower surface of the inclined column joint portion Ba in beam B, and are provided with a torsion prevention member 4 that is joined to the side surface of the inclined column joint portion Ba to prevent torsion of beam B.

Description

Technical Field

[0001] The present invention relates to a structural structure formed by joining a beam and an inclined column inclined in an intersection direction intersecting the extending direction of the beam in a plan view.

Background Art

[0002] As the background art of the present invention, for example, an opening base is composed of an annular beam, a truss column supporting the annular beam, and an annular foundation beam receiving the truss column, and a tension member is provided in a spoke shape in each beam plane of the annular beam and the annular foundation beam in this opening base. There is an opening base structure of a large cooling tower (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the opening base structure described in Patent Document 1, since the annular foundation beam is an annular beam (frame-shaped beam) having a larger diameter than the annular beam, each of the column members constituting the truss column is an inclined column inclined in the beam plane.

[0005] By the way, in a tower-like structure such as a radio tower, for example, an inclined column provided in the opening base structure described in Patent Document 1 is joined to the upper and lower surfaces of the beam, and an inclined region in which the upper and lower inclined columns are connected vertically via the beam is provided. It is considered that the design property can be improved. And in such a case, for example, a plurality of frame-shaped beams having different sizes and similar shapes are arranged in a plurality of stages in the order that their sizes become larger toward the lower side of the tower-like structure, and the frame-shaped beams adjacent to each other above and below are connected by a plurality of inclined columns extending over them. A structural structure is conceivable.

[0006] However, in the frame structure described above, it is common practice to align the column axes of the upper and lower inclined columns joined to the upper and lower surfaces of the beam in order to properly transmit vertical loads between the upper and lower inclined columns via the beam. However, aligning the column axes requires increasing the beam width of the beam placed between the columns, or tilting the beam in the beam width direction to match the inclination of the inclined columns. This leads to increased costs due to the increased beam width and increased complexity in fabrication due to the tilting of the beam in the beam width direction.

[0007] In light of these circumstances, the main objective of the present invention is to provide a rational structural frame that allows for the appropriate transmission of forces between the upper inclined column and the beam, and between the lower inclined column and the beam, without increasing costs due to increasing the beam width or complicating processing due to inclining the beam in the beam width direction, while improving design aesthetics by providing an inclined region in which the inclined column is connected vertically via a beam. [Means for solving the problem]

[0008] The first characteristic configuration of the present invention is a frame structure formed by joining a beam and an inclined column that is inclined in a direction that intersects the extending direction of the beam in a plan view, The inclined column consists of an upper inclined column positioned on the upper side of the beam and a lower inclined column positioned on the lower side of the beam. The upper inclined column and the lower inclined column are inclined in the same direction, and their respective column axes are misaligned in the beam width direction, and are joined to the upper or lower surface of the inclined column joint portion in the beam. The key feature is that a torsion prevention member is provided, which is joined to the side surface of the inclined column joint to prevent the beam from twisting.

[0009] In this configuration, the inclined columns are an upper inclined column and a lower inclined column that are joined to the upper and lower surfaces of the beam in the same direction, thereby providing an inclined region in which the inclined columns are connected vertically via the beam.

[0010] Furthermore, in providing such an inclined region, this configuration offsets the column axis of the upper inclined column and the column axis of the lower inclined column in the beam width direction. This eliminates the need to widen the beam width of the beam placed between the upper and lower inclined columns or to incline the beam in the beam width direction to match the inclination of the inclined columns in order to align their column axes. This prevents increased costs due to widening the beam width and increased complexity of processing due to inclining the beam in the beam width direction.

[0011] Furthermore, by attaching anti-torsion members to the sides of the inclined column joints in the beam, it is possible to prevent torsion of the beam caused by the couple force resulting from the misalignment of the column axes of the upper and lower inclined columns connected via the beam in the beam width direction. In other words, although the structure involves a misalignment of the column axes of the upper and lower inclined columns in the beam width direction, the torsion of the beam caused by this misalignment can be prevented by the anti-torsion members, allowing for proper force transmission between the upper and lower inclined columns and the beam. In addition, the anti-torsion members, along with the beam between the upper and lower inclined columns, resist the horizontal component force generated by the axial force difference between the upper and lower inclined columns, thereby improving the resistance to that horizontal component force.

[0012] Therefore, by providing an inclined region in which inclined columns are connected vertically via beams, it is possible to improve the design aesthetics, while avoiding increased costs due to larger beam widths or increased complexity of processing due to inclining the beams in the beam width direction. This allows for the appropriate transmission of forces between the upper inclined column and beam, and between the lower inclined column and beam.

[0013] A second characteristic feature of the present invention is that the beam and the anti-torsion member are made of steel materials that have the same vertical length and are joined with their upper and lower flanges butted together.

[0014] According to this configuration, at the inclined column joint portion of the beam, the torsion prevention members are joined in a state where their upper and lower flanges are abutted against each other, so that the torsional deflection due to the couple force in the beam caused by the misalignment of the column axes of the upper inclined column and the lower inclined column connected via the beam can be more reliably prevented.

[0015] The third characteristic configuration of the present invention is that the beam is a frame-shaped beam that is continuously arranged in a frame shape in plan view, and the inclined column joint portions are provided at a plurality of locations in the extending direction of the frame-shaped beam. The torsion prevention members are installed at a plurality of the inclined column joint portions.

[0016] According to this configuration, the torsional deflection of the beam caused by the misalignment of the column axes of the upper inclined column and the lower inclined column connected via the beam can be efficiently prevented while reducing the number of installed torsion prevention members.

Brief Description of the Drawings

[0017] [Figure 1] Schematic vertical sectional view of the frame portion in the tower-like structure [Figure 2] Cross-sectional view taken along line II-II of FIG. 1 [Figure 3] (a) is a view taken in the direction of arrow III-III of FIG. 1, and (b) is a cross-sectional view taken along line b-b of FIG. 3(a). [Figure 4] Horizontal sectional view showing another embodiment of the torsion prevention member [Figure 5] Horizontal sectional view showing another alternative embodiment of the torsion prevention member

Embodiments for Carrying Out the Invention

[0018] Hereinafter, as an example of an embodiment for carrying out the present invention, an embodiment in which the frame structure according to the present invention is applied to a tower-like structure will be described based on the drawings. Note that the frame structure according to the present invention can be applied to various structures other than tower-like structures.

[0019] As shown in Fig. 1, the tower-like structure exemplified in this embodiment includes a frame structure S having a narrowing shape that includes a beam B and an inclined column P inclined in an intersection direction that intersects the extending direction of the beam B in a plan view, and is joined together. As shown in Fig. 2, the beam B is a circular beam, which is an example of a frame-shaped beam that is connected in a frame shape in a plan view. Although not shown, the circular beam B is formed into a shape that is connected in a circular frame shape in a plan view by bolt-joining a plurality of H-shaped steels formed in an arc shape by bending in the weak axis direction through a plurality of splice plates.

[0020] In addition, in this embodiment, the circular beam B is exemplified as the beam B, but it is not limited to this. For example, a frame-shaped beam such as a triangular beam that is connected in a triangular frame shape in a plan view or a quadrangular beam that is connected in a quadrangular frame shape in a plan view may be used. Also, the beam B may be one that extends linearly in the horizontal direction other than the frame-shaped beam. Furthermore, the H-shaped steel used for the circular beam B may be one formed in an arc shape by bending in the strong axis direction. And the steel material used for the beam B is not limited to H-shaped steel, and for example, built-up H-shaped steel or square steel pipes may be used.

[0021] As shown in Figs. 1 to 3, the circular beam B is provided with inclined column joint portions Ba at a plurality of locations (eight locations in this embodiment) in the circumferential direction, which is the extending direction thereof, where the inclined columns P are pin-joined. As shown in Fig. 2, the inclined column joint portions Ba are dispersed in the circumferential direction of the circular beam B at equal intervals of 45 degrees based on the center Bc of the circular beam B. As shown in Fig. 3, a plurality of stiffeners 1 for reinforcing the inclined column joint portions Ba are welded to each of the inclined column joint portions Ba.

[0022] In addition, in this embodiment, the inclined column joint portions Ba where the inclined columns P are pin-joined are exemplified, but it is not limited to this, and the inclined columns P may be rigidly joined.

[0023] Although not shown in the diagram, the multiple inclined columns P are arranged between adjacent circular beams B, in a configuration where they are alternately inclined in a V-shape and an A-shape when viewed from the side in the circumferential direction (extension direction) of the circular beams B. Furthermore, the multiple inclined columns P are also arranged in a configuration where they are alternately in a V-shape and an A-shape when viewed from the side in the vertical direction where the circular beams B are arranged. As a result, in the frame section S of the tower-like structure illustrated in this embodiment, each inclined column P serves as both an axial force member that receives vertical loads and a bracing member that has a bracing effect that deflects horizontal forces.

[0024] In this embodiment, the inclined columns P are shown as being arranged alternately in a V-shape and an inverted V-shape when viewed from the side in the circumferential direction of the circular beam B. However, the embodiment is not limited to this, and the columns may be arranged in a position that is not inclined in the circumferential direction of the circular beam B.

[0025] As shown in Figure 3, a circular steel pipe is used for each inclined column P. A lower bracket 2 is welded to the lower end of each inclined column P, which is bolted to the upper flange fa of the circular beam B. An upper bracket 3 is welded to the upper end of each inclined column P, which is bolted to the lower flange fb of the circular beam B.

[0026] In this embodiment, a circular steel pipe is used as an example of the steel material used for the inclined column P, but it is not limited to this, and other materials such as square steel pipes or H-shaped steel may also be used.

[0027] As shown in Figure 1, the frame S is equipped with multiple circular beams B1 to B3 of different sizes. The multiple circular beams B1 to B3 are arranged in multiple stages at predetermined intervals, with their sizes decreasing as they move towards the top of the tower-like structure.

[0028] In this embodiment, the structural frame S is exemplified by a configuration in which circular beams B1 to B3 of different sizes are arranged in multiple stages at predetermined intervals, with their sizes decreasing as they rise towards the top of the tower-like structure. However, the configuration is not limited to this; for example, the beams may be arranged in multiple stages at predetermined intervals, with their sizes increasing as they rise towards the top of the tower-like structure. Furthermore, the number of circular beams B1 to B3 of different sizes in the structural frame S can be varied as long as there are three or more.

[0029] Each inclined column P shown in Figure 1 is an upper inclined column PU positioned on the upper side of the circular beam B, and a lower inclined column PL positioned on the lower side of the circular beam B. In the frame section S, as also shown in Figure 3(b), the upper inclined column PU and the lower inclined column PL, which are connected vertically via the circular beam B, are inclined in the same direction toward the interior of the frame section S, and their respective column axes Pc are misaligned in the beam width direction of the circular beam B, and are joined to the upper surface (upper surface of the upper flange fa) or lower surface (lower surface of the lower flange fb) of the inclined column joint Ba in the circular beam B.

[0030] In other words, in the frame section S illustrated in this embodiment, each of the inclined columns P is either an upper inclined column PU or a lower inclined column PL that is joined to the upper and lower surfaces of the circular beam B in the same direction, thereby providing an inclined region SA that is connected vertically via the upper inclined column PU, the lower inclined column PL, and the circular beam B.

[0031] Furthermore, in a structure with such an inclined region SA, by offsetting the column axis Pc of the upper inclined column PU and the column axis Pc of the lower inclined column PL in the beam width direction of the circular beam B, it becomes unnecessary to widen the beam width of the circular beam B positioned between the upper and lower inclined columns PU and PL, or to incline the circular beam B in the beam width direction to match the inclination of the upper and lower inclined columns PU and PL, in order to align their column axis Pc. This prevents increased costs due to widening the beam width of the circular beam B and the increased complexity of processing due to inclining the circular beam B in the beam width direction.

[0032] Therefore, by providing an inclined region SA through which the upper inclined column PU and the lower inclined column PL are connected vertically via a circular beam B, it is possible to improve the design aesthetics while providing a rational frame structure that can appropriately transmit forces between the upper inclined column PU and the circular beam B, and between the lower inclined column PL and the circular beam B, without increasing costs by increasing the beam width of the circular beam B or complicating processing by inclining the circular beam B in the beam width direction.

[0033] As shown in Figures 1-2 and Figure 3(b), the frame S is equipped with torsion prevention members 4 that prevent twisting of the circular beam B by being joined to the side surface of the inclined column joint Ba. The torsion prevention members 4 employ cross beams that are erected on the four inclined column joints Ba located at 90-degree intervals on the circular beam B, and the outer ends 4A of these four locations are rigidly joined by welding to the inner side surface of the beam at the corresponding inclined column joints Ba.

[0034] This prevents twisting of the circular beam B caused by a couple force resulting from the misalignment of the column axes Pc of the upper inclined column PU and the lower inclined column PL, which are connected via the circular beam B, in the beam width direction. Furthermore, since the torsion prevention member 4 is a cross beam installed at four of the eight inclined column connection points Ba provided on the circular beam B, compared to, for example, a case where torsion prevention members 4 are individually connected to all of the inclined column connection points Ba provided on the circular beam B, it is possible to efficiently prevent twisting of the circular beam B caused by the misalignment of the column axes Pc of the upper inclined column PU and the lower inclined column PL, which are connected via the circular beam B, while reducing the number of torsion prevention members 4 required.

[0035] In other words, in order to provide the aforementioned inclined region SA in the frame section S, the structure is designed so that the column axis Pc of the upper inclined column PU and the column axis Pc of the lower inclined column PL are misaligned in the beam width direction. However, the twisting of the circular beam B caused by this misalignment can be prevented by the twist prevention member 4, thereby enabling proper force transmission between the upper and lower inclined columns PU and PL and the circular beam B. Furthermore, the twist prevention member 4, along with the circular beam B between the upper and lower inclined columns PU and PL, resists the horizontal component force generated by the axial force difference between the upper and lower inclined columns PU and PL, thereby improving the resistance to that horizontal component force.

[0036] As shown in Figure 3(b), the anti-torsion member 4 is made of an H-shaped steel that has the same vertical length (beam depth) as the H-shaped steel used in the circular beam B, and has upper and lower flanges 4a and 4b that are welded together in a butt position with the upper and lower flanges fa and fb of the circular beam B, and a web 4c that extends toward and abuts against the web w of the circular beam B and is welded together. This allows each outer end 4A of the anti-torsion member 4 to be welded to the inner side surface of the beam at the corresponding inclined column joint Ba of the circular beam B, with their upper and lower flanges 4a, fa, 4b, and fb butted together, and with the extended end of the web 4c of the anti-torsion member 4 abutting against the side surface of the web w of the circular beam B.

[0037] Therefore, it is possible to more reliably prevent torsion caused by couple forces in the circular beam B, which results from the misalignment of the column axes Pc of the upper inclined column PU and the lower inclined column PL, connected via the circular beam B, in the beam width direction of the circular beam B.

[0038] Although not shown in the diagram, the cross beam used in the anti-torsion member 4 is constructed by bolting together multiple H-shaped steel beams of the same vertical length (beam depth) via gusset plates, splice plates, etc.

[0039] In this embodiment, the outer end portion 4A of the anti-torsion member 4 is shown as being welded to the inner side surface of the beam at the inclined column joint portion Ba of the circular beam B. However, the embodiment is not limited to this, and for example, the inclined column joint portion Ba of the circular beam B may be provided with brackets used for bolting the upper and lower flanges 4a, fa, 4b, fb and webs 4c, w of the anti-torsion member 4 and the circular beam B, so that the outer end portion 4A of the anti-torsion member 4 is bolted to the inner side surface of the beam at the inclined column joint portion Ba of the circular beam B via the bolting brackets.

[0040] Furthermore, in this embodiment, the H-shaped steel used for the torsion prevention member 4 is exemplified as having the same vertical length as the H-shaped steel used for the circular beam B. However, it is not limited to this, and for example, it may be shorter in the vertical direction than the H-shaped steel used for the circular beam B. Moreover, the steel material used for the torsion prevention member 4 is not limited to H-shaped steel; for example, built-up H-shaped steel or square steel pipes may also be used.

[0041] [Another embodiment] Other embodiments of the present invention will be described. Furthermore, the configurations of each embodiment described below are not limited to being applied individually, but can also be applied in combination with the configurations of other embodiments.

[0042] (1) In the above embodiment, the upper inclined column PU and lower inclined column PL, which are connected vertically via a circular beam B, are shown as examples in which they are inclined in the same direction toward the interior of the frame S. However, the embodiment is not limited to this, and for example, the upper inclined column PU and the lower inclined column PL may be inclined in the same direction toward the exterior of the frame S.

[0043] (2) In the above embodiment, the circular beam B is shown as having inclined column joints Ba provided at 45-degree intervals, but it is not limited to this, and for example, the inclined column joints Ba may be provided at 30-degree intervals or 90-degree intervals.

[0044] (3) In the above embodiment, a cross beam installed on four inclined column joints Ba located at 90-degree intervals on the circular beam B was used as the anti-torsion member 4. However, the invention is not limited to this, and for example, as shown in Figure 4, a beam installed in a square frame shape in plan view on four inclined column joints Ba located at 90-degree intervals on the circular beam B, or as shown in Figure 5, a beam installed in a triangular frame shape in plan view on three inclined column joints Ba located at 120-degree intervals on the circular beam B, may be used. In addition, although not shown, the anti-torsion member 4 may be individually joined to the sides of all inclined column joints Ba provided on the circular beam B. [Explanation of symbols]

[0045] 4. Anti-twist member 4a Flange 4b flange B. Circular beam (beam, frame beam) Ba inclined column joint area P inclined column PL lower inclined column PU upper inclined column Pc column axis FA flange fb flange

Claims

1. A frame structure formed by joining a beam and an inclined column that is inclined in a direction that intersects the extending direction of the beam in a plan view, The inclined column consists of an upper inclined column positioned on the upper side of the beam and a lower inclined column positioned on the lower side of the beam. The upper inclined column and the lower inclined column are inclined in the same direction, and their respective column axes are misaligned in the beam width direction, and are joined to the upper or lower surface of the inclined column joint portion in the beam. A frame structure in which a torsion prevention member is attached to the side surface of the inclined column joint portion to prevent the torsion of the beam.

2. The frame structure according to claim 1, wherein the beam and the torsion prevention member are steel materials that have the same vertical length and are joined with their upper and lower flanges butted together.

3. The aforementioned beam is a frame-shaped beam in which the beams are connected in a frame-like manner when viewed from above, and the inclined column joint portions are provided at multiple locations along the extension direction of the frame-shaped beam. The frame structure according to claim 1 or 2, wherein the torsion prevention member is installed on multiple of the inclined column joint portions.

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