Beam through hole reinforcement structure

Abstract

To provide, in a beam penetration hole reinforcement structure having an unreinforced part in a perimeter of a penetration hole, further reliable reinforcement of the penetration hole as well as to improve constructability.SOLUTION: A reinforcement structure 1 for a penetration hole 14 provided in a steel beam 10 having a web 11 and flanges 12, 13, is provided with reinforcements 20a, 20b which include a hole perimeter reinforcement part 21 having an arc edge 22 shaped along a part of a perimeter of the penetration hole 14 and a fastening part 23 which is a fastening point with the web 11, and an unreinforced part 30 provided along a remainder of the perimeter of the penetration hole 14. The hole perimeter reinforcement part 21 is present between the unreinforced part 30 and the flanges 12, 13, and at least one fastening part 23 is provided in each of a plurality of first regions R1 provided in the hole perimeter reinforcement part 21, as well as at least one fastening part is provided in each of second regions R2.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a technique for reinforcing through holes in beams in steel frame structures. [Background technology]

[0002] Conventionally, a reinforcement structure in which a reinforcing material is welded around a through hole formed in a beam of a steel frame structure is known. However, this reinforcement structure can cause problems such as deformation of the beam or local material change due to welding, and problems such as difficulty in securing welding quality during construction or difficulty in welding itself during erection.

[0003] For this reason, a reinforcement structure in which reinforcing materials are attached around the through-holes by high-strength bolts instead of welding has been conventionally adopted. Examples of such reinforcement structures include those described in Patent Documents 1 and 2. Patent Document 1 discloses a reinforcement structure in which opening reinforcement plates are joined around the through-holes by high-strength bolts on both sides of the beam web. Patent Document 2 discloses a structure in which the through-holes of beam joints are reinforced by splice plates. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Utility Model Application Publication No. 5-057149 [Patent Document 2] Japanese Patent Application Publication No. 5-179756 Summary of the Invention [Problem to be solved by the invention]

[0005] In the reinforcement structure described in Patent Document 1, many bolts are required to fasten the opening reinforcement plate to the beam web, which makes construction complicated. On the other hand, the reinforcement structure described in Patent Document 2 is configured to provide splice plates above and below the through hole, and is considered to be easier to construct than the reinforcement structure described in Patent Document 1. However, since the structure is such that the through hole is not reinforced except for the upper and lower ends, that is, the structure has an unreinforced portion around the through hole, there is room for improvement in terms of reinforcing the through hole against shear force.

[0006] The present invention has been made in consideration of the above-mentioned circumstances, and aims to more reliably reinforce the through hole and improve workability in a beam through hole reinforcement structure having an unreinforced portion around the through hole. [Means for solving the problem]

[0007] One aspect of the present invention that solves the above-mentioned problems is a reinforcement structure for a through hole provided in a steel beam having a web and a flange, comprising a reinforcing material including a hole perimeter reinforcement portion having an arc-shaped edge shaped along part of the perimeter of the through hole and a fastening portion that is a fastening point with the web, and an unreinforced portion provided along the remainder of the perimeter of the through hole, wherein the hole perimeter reinforcement portion is between the unreinforced portion and the flange, and at least one fastening portion is provided in each of the following first regions provided in the hole perimeter reinforcement portion, and at least one fastening portion is provided in each of the following second regions. X-axis direction: the longitudinal direction of the steel beam Y-axis direction: A direction perpendicular to the X-axis direction when viewed from a direction perpendicular to the web surface. α x Line: A straight line extending in the X-axis direction that passes through the end point of the arc edge ·Circle intersection: α mentioned above x Intersection of the line and the through hole α y Line: A straight line extending in the Y-axis direction that passes through the circle edge intersection point α x Line ´: A tangent line of the through hole extending in the X-axis direction α yLine ´: A tangent line of the through hole extending in the Y-axis direction First region: the α in the hole periphery reinforcement portion x Outside the line and the α y Area outside the lines Second region: the α in the hole periphery reinforcement portion x Outside the line ' and the α y The area outside the line overlaps with the first area.

[0008] The reinforcing material may include an upper reinforcing material that reinforces an upper portion of the through hole, and a lower reinforcing material that reinforces a lower portion of the through hole.

[0009] The thickness of a central portion of the periphery reinforcing portion in the X-axis direction may be greater than the thickness of an end portion.

[0010] The unreinforced portion may be provided at only one location around the through hole.

[0011] An angle between a line passing through a center of the through hole, extending in the Y-axis direction, and a line connecting the center of the through hole and the circle edge intersection point may be approximately 45°. Effect of the Invention

[0012] According to the present invention, in a beam through hole reinforcement structure having a non-reinforced portion around the through hole, the reinforcement of the through hole can be more reliably performed and workability can be improved. [Brief description of the drawings]

[0013] [Figure 1] 1 is a front view and a right side view showing the schematic configuration of a beam through hole reinforcement structure according to a first embodiment. FIG. [Diagram 2] FIG. 2 is a single-item view of the reinforcing material according to the first embodiment. [Diagram 3] 4 is a diagram showing a fastening region (second region) between a steel beam and a reinforcing material according to the first embodiment. FIG. [Figure 4] FIG. 13 is a diagram for explaining the definition of a fastening region (second region). [Diagram 5]11 is a diagram showing a deformation state of a through hole when a shear force is applied. FIG. [Figure 6] 13A and 13B are a front view and a right side view showing the schematic configuration of a beam through hole reinforcement structure according to a second embodiment. [Figure 7] 11 is a single-item view (front view and bottom view) of a reinforcing material according to a second embodiment. FIG. [Figure 8] 11A and 11B are diagrams illustrating an example of a configuration of a reinforcing material according to a second embodiment. [Figure 9] 13A to 13C are a left side view, a front view, and a right side view showing the schematic configuration of a beam through hole reinforcement structure relating to a third embodiment. [Figure 10] FIG. 13 is a single-item view of a reinforcing material according to a third embodiment. [Figure 11] 13 is a diagram showing a fastening region (second region) between a steel beam and a reinforcing material according to the third embodiment. FIG. [Figure 12] FIG. 13 is a diagram for explaining the definition of a fastening region (second region) according to the third embodiment. [Figure 13] 11A to 11C are diagrams showing examples of attaching reinforcing materials to both sides of a web. [Figure 14] 11A to 11C are diagrams showing examples of attaching reinforcing materials to both sides of a web. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In this specification and the drawings, elements having substantially the same functional configurations are denoted by the same reference numerals, and duplicated description will be omitted.

[0015] First Embodiment Fig. 1 is a front view and a right side view showing a schematic configuration of a beam through hole reinforcement structure according to a first embodiment Fig. 2 is a single-item view of a reinforcement material according to the first embodiment.

[0016] As shown in FIG. 1, a beam through-hole reinforcement structure 1 (hereinafter referred to as "reinforcement structure") includes a steel beam 10 and two reinforcement members 20a, 20b.

[0017] The steel beam 10 is a beam having a web 11 and flanges 12, 13, and is made of steel material such as an H-shaped steel or an I-shaped steel. A circular through hole 14 is formed in the center of the web 11 between the flanges 12, 13.

[0018] The two reinforcing members 20a, 20b are substantially rectangular plate members that reinforce the periphery of the through hole 14, and are disposed above and below the through hole 14. More specifically, the upper reinforcing member 20a is disposed between the through hole 14 and the upper flange 12, and the lower reinforcing member 20b is disposed between the through hole 14 and the lower flange 13.

[0019] As shown in Figure 2, the lower reinforcement material 20b has a hole-surrounding reinforcement portion 21 that reinforces the area around the through hole 14, an arc edge 22 formed on the hole-surrounding reinforcement portion 21, and a fastening portion 23 that is the fastening point with the steel beam 10.

[0020] The hole periphery reinforcing portion 21 has a surface that contacts the web surface around the through hole 14 .

[0021] The arc side 22 is a curved portion that is curved so as to be convex toward the inside of the hole periphery reinforcement portion 21, and is formed in the center of one of the two long sides of the hole periphery reinforcement portion 21. The radius of curvature of the arc side 22 is approximately the same as the radius of curvature of the through hole 14, and the arc side 22 is shaped to follow the periphery (hole circumference) of the through hole 14. The arc length of the arc side 22 is shorter than half the length of the circumference of the through hole 14.

[0022] The fastening portion 23 is an insertion hole through which a fastening tool such as a bolt is inserted. The fastening portions 23 are provided at two locations on the periphery reinforcing portion 21 of the lower reinforcing member 20b.

[0023] The upper reinforcement member 20a is a part having the same shape as the lower reinforcement member 20b, and has an arc side 22 and a fastening portion 23 in a hole periphery reinforcement portion 21, similar to the lower reinforcement member 20b.

[0024] Although the reinforcing members 20a, 20b do not have to have the same shape, it is preferable that they have the same shape in order to uniformly generate deformation resistance against shear force at the upper and lower parts of the through hole 14. For the same reason, it is preferable that the reinforcing members 20a, 20b each have a symmetrical shape.

[0025] The upper reinforcement member 20a and the lower reinforcement member 20b are arranged so as to be upside down around the through hole 14. In detail, the upper reinforcement member 20a is arranged at the upper part of the through hole 14 so that a part of the periphery of the through hole 14 and the position of the arc side 22 of the upper reinforcement member 20a overlap, and the lower reinforcement member 20b is arranged at the lower part of the through hole 14 so that a part of the periphery of the through hole 14 and the position of the arc side 22 of the lower reinforcement member 20b overlap.

[0026] 1(b), the upper reinforcement member 20a and the lower reinforcement member 20b are attached to both surfaces 11a, 11b, respectively, of the web 11. In detail, a pair of an upper reinforcement member 20a and a lower reinforcement member 20b is attached to one web surface 11a, and another pair of an upper reinforcement member 20a and a lower reinforcement member 20b is attached to the other web surface 11b.

[0027] As mentioned above, the arc length of each of the arc sides 22 of the upper reinforcement material 20a and the lower reinforcement material 20b is shorter than half the circumference of the through hole 14, so that when each reinforcement material 20a, 20b is fixed to the web 11, a gap is formed between the hole periphery reinforcement portions 21 of each reinforcement material 20a, 20b.

[0028] In the above gap, since through hole 14 is not reinforced by periphery reinforcement portion 21, this gap portion becomes unreinforced portion 30. Unreinforced portions 30 exist on the left and right sides of through hole 14, with through hole 14 in between, and periphery reinforcement portions 21 exist between unreinforced portions 30 and flanges 12, 13, respectively.

[0029] That is, in the reinforcement structure 1, a part of the periphery of the through hole 14 is reinforced by the hole periphery reinforcing part 21, and the remaining part of the periphery of the through hole 14 is not reinforced due to the presence of the non-reinforced part 30. In order to increase the deformation resistance against shear force in such a reinforcement structure 1, it is necessary to have a specific fastening area described later and to position the fastening part 23 within this specific fastening area. Note that the state in which the fastening part 23 is provided within the specific fastening area means a state in which the center of the insertion hole as the fastening part 23 is located within the specific fastening area (including the case in which the center of the insertion hole is located on the boundary line of the area). Therefore, the state in which the center of the insertion hole is located outside the specific fastening area means a state in which the fastening part 23 is not provided within the specific fastening area, even if a part of the area of ​​the insertion hole is included within the specific fastening area.

[0030] 3 is a diagram showing fastening regions R2 between the steel beam 10 and the reinforcing members 20a and 20b. As shown in the figure, the reinforcing structure 1 has four fastening regions R2, and a fastening portion 23 is located in each of the fastening regions R2.

[0031] Hereinafter, the definition of the fastening region R2 will be described with reference to FIG.

[0032] In the following description, the "X-axis direction" refers to the longitudinal direction of the steel beam 10, in other words, the direction parallel to the flanges 12, 13 when viewed from a direction perpendicular to the web surface 11a. The "Y-axis direction" refers to the direction perpendicular to the X-axis direction when viewed from a direction perpendicular to the web surface 11a, in other words, the direction perpendicular to the flanges 12, 13. In the following description, a straight line extending in the X-axis direction that passes through the center of the through hole 14 is referred to as the center line C. x and a straight line passing through the center of the through hole 14 and extending in the Y-axis direction is defined as a center line C y It is written as follows.

[0033] First, as shown in FIG. 4(a), a straight line extending in the X-axis direction and passing through the end point 24 (also shown in FIG. 2) of the arc side 22 is defined as “α xIn this embodiment, a straight line passing through the end point 24 of the arc side 22 of the upper reinforcement member 20a and a straight line passing through the end point 24 of the arc side 22 of the lower reinforcement member 20b are defined as a straight line having an α x It becomes a line.

[0034] Depending on the shape of the arcuate side 22 of each of the reinforcing members 20a and 20b, for example when the arcuate side 22 is not symmetrical, there may be two straight lines passing through the end points 24 of the arcuate side 22 for each reinforcing member, resulting in a total of four α x However, in such a case, among the multiple end points 24 of one reinforcement member, the end point 24 located closer to the flange (in other words, the center line C x A line extending in the X-axis direction that passes through the end point farthest from the x Line.

[0035] Next, α x The intersection P between the line and the through hole 14 is defined as a "circular edge intersection." In this embodiment, the upper reinforcement member 20a and the lower reinforcement member 20b each have a bilaterally symmetrical shape, and the arc-shaped sides 22 of each reinforcement member 20a, 20b are located along the periphery of the through hole 14, so that the positions of the end points 24 of the two arc-shaped sides 22 are directly the positions of the circular edge intersection P.

[0036] Next, as shown in Figure 4(b), a straight line extending in the Y-axis direction through the circle edge intersection point P is called "α y In this embodiment, the four circular edge intersection points P are located at positions symmetrical in the vertical and horizontal directions, so that the center line C of the through hole 14 is defined as a line. y A straight line passing through the circular edge intersection points P arranged vertically on the left side of the line and the center line C of the through hole 14 y The line passing through the intersection point P, which is aligned vertically to the right of α y It becomes a line.

[0037] In addition, depending on the shape of the arcuate sides 22 of the reinforcing members 20a and 20b, the positions of the arcuate intersection points P in the X-axis direction may differ from each other, so that the four α y However, in such a case, the center line C of the through hole 14 y Among the circular intersection points P that exist to the left of the center line Cy The first line α is the line extending in the Y-axis direction through the circular edge intersection point P that is the furthest from the y The center line C of the through hole 14 is y Among the circular intersection points P that exist to the right of the center line C y The second line α is drawn along the Y axis through the circular edge intersection point P, which is the furthest from the y Line.

[0038] Next, α in the hole periphery reinforcement portion 21 x Outside the line (opposite side to the center side of the through hole 14), and α y The region R1 on the outside of the line (opposite the center side of the through hole 14) is defined as a "first region."

[0039] Next, as shown in FIG. 4(c), a tangent to the through hole 14 extending in the X-axis direction is defined as “α x The tangent line of the through hole 14 extending in the Y-axis direction is defined as "α y ' line'.

[0040] Finally, α in the hole perimeter reinforcement portion 21 x The outside of the line (opposite side of the center of the through hole 14) and α y The region R2 where the region outside the line (the side opposite to the center of the through hole 14) overlaps with the first region R1 is defined as the "second region." This second region R2 is the fastening region R2 between the steel beam 10 and each of the reinforcing members 20a and 20b described above.

[0041] In this embodiment, the above-mentioned first region R1 and a fastening region R2 located within the first region R1 are present at each of the four corners of a rectangle formed by the reinforcing members 20a, 20b and the pair of unreinforced portions 30, and fastening portions 23 are located within each fastening region R2. The upper reinforcing member 20a and the lower reinforcing member 20b are fastened to the web surface 11a at each fastening portion 23 with a bolt or the like.

[0042] As described above, in the reinforcement structure 1 according to this embodiment, the periphery hole reinforcement part 21 having the arc side 22 and the non-reinforced part 30 are provided, and the fastening parts 23 are located in each of the fastening parts R2 (second area) provided in each first area R1. According to tests carried out by the inventors of the present application, it has been confirmed that in such a reinforcement structure 1, by fastening the steel beam 10 and the reinforcing members 20a, 20b with bolts or the like at each fastening part 23, sufficient reinforcement performance can be exhibited even if fastening is not performed outside the fastening area R2.

[0043] That is, even though the reinforcement structure 1 has the unreinforced portion 30, the reinforcement performance of the through hole is improved compared to the conventional structure such as that of Patent Document 2. Furthermore, the reinforcement structure 1 can reduce the number of fastening points compared to the conventional structure in which a large number of bolts are fastened at equal intervals along each side of the reinforcement plate, thereby reducing the load of the fastening work and improving workability. In addition, the reinforcement structure 1 can enjoy the effects of reducing the construction cost and the weight of the steel frame structure by reducing the amount of material used due to the presence of the unreinforced portion 30 and reducing the number of bolts.

[0044] In this embodiment, one fastening portion 23 is provided per fastening region R2, but from the viewpoint of enhancing the reinforcing performance, two or more fastening portions 23 may be provided per fastening region R2. In other words, at least one fastening portion 23 may be provided in each of the multiple fastening regions R2 (second regions). Also, a fastening portion 23 may be provided in the second region R2, and another fastening portion (not shown) may be provided outside the second region R2 and within the first region R1. That is, at least one fastening portion 23 may be provided in each region of the first region R1, and at least one fastening portion 23 may be provided in each region of the second region R2. Since the second region R2 is a region that exists in the first region R1, for example, when one fastening portion 23 is provided in the second region R2, the fastening portion 23 is counted as one of the fastening portions provided in the second region R2, but is also counted as one of the fastening portions provided in the first region R1. In other words, when one fastening portion 23 is provided in the second region R2, it can be said that one fastening portion 23 is also provided in the first region R1.

[0045] In addition, according to a test conducted by the inventors of the present application, it has been confirmed that when a shear force as shown by the black arrow in Fig. 5 acts on the through hole 14, the through hole 14 is deformed in a direction of approximately 45°. Therefore, in order to effectively reinforce the through hole 14, it is necessary to make the center line C of the through hole 14 shown in Fig. 3 y The angle θ between the line connecting the center of the through hole 14 and the circular edge intersection point P is preferably approximately 45° (40 to 50°).

[0046] Second Embodiment Fig. 6 is a front view and a right side view showing a schematic configuration of a beam through hole reinforcement structure 1 according to the second embodiment. Fig. 7 is a single-item view (front view and bottom view) of a reinforcement material 20b according to the second embodiment.

[0047] In the second embodiment, only the shape of the hole perimeter reinforcement part 21 is different from that of the first embodiment. The reinforcement structure 1 according to the second embodiment is useful when the distance between the hole perimeter reinforcement part 21 and the flanges 12, 13 of the steel beam 10 is short. The shape of the hole perimeter reinforcement part 21 according to the second embodiment will be described below, but descriptions similar to those of the first embodiment may be omitted.

[0048] As shown in FIG. 6, in this embodiment as well, the upper reinforcing member 20a and the lower reinforcing member 20b are arranged upside down above and below the through hole 14, and have the same shape as individual components.

[0049] 7, the periphery of the fastening portion 23 of the hole periphery reinforcement portion 21 according to this embodiment is flat, but in the area where the arc side 22 is formed, the plate thickness of the hole periphery reinforcement portion 21 gradually increases toward the center of the hole periphery reinforcement portion 21 in the X-axis direction. In other words, in a cross section of the hole periphery reinforcement portion 21 perpendicular to the Y-axis direction, there is a mountain-shaped portion toward the center of the hole periphery reinforcement portion 21.

[0050] As exemplified in this embodiment, when the plate thickness of the central portion of the periphery hole reinforcement portion 21 in the X-axis direction is thicker than the plate thickness of the end portion, the rigidity of the periphery hole reinforcement portion 21 against shear force is increased, and the reinforcing performance is improved. Therefore, even if the width W in the Y-axis direction of the periphery hole reinforcement portion 21 shown in Fig. 7(a) is made shorter than that of the flat plate-shaped periphery hole reinforcement portion 21 exemplified in the first embodiment, it is possible to obtain reinforcing performance equivalent to that of the flat plate-shaped periphery hole reinforcement portion 21.

[0051] In the above explanation, an example has been described in which the plate thickness of the periphery hole reinforcement part 21 gradually increases toward the center of the periphery hole reinforcement part 21 in the X-axis direction in the area where the arc side 22 is formed, but as exemplified in Figures 8(a) to (c), a separate plate material 25 may be joined to the periphery hole reinforcement part 21 so as to overlap it. Even in such a case, the plate thickness of the center of the periphery hole reinforcement part 21 in the X-axis direction is thicker than the plate thickness of the end parts, so that the above-mentioned reinforcing performance can be obtained.

[0052] According to the reinforcement structure 1 of this embodiment, it is possible to reduce the size of the reinforcement members 20a, 20b while ensuring the reinforcing performance of the through hole 14. This makes it possible to apply the reinforcement structure 1 to a steel beam 10 in which the interval between the flanges 12, 13 is narrow, for example.

[0053] <Third embodiment> Fig. 9 is a left side view, a front view, and a right side view showing a schematic configuration of a beam through hole reinforcement structure 1 according to the third embodiment. Fig. 10 is a single view of a reinforcement material 20 according to the third embodiment.

[0054] The third embodiment differs from the first embodiment in that one reinforcing member 20 is used instead of the upper reinforcing member 20a and the lower reinforcing member 20b, and that only one unreinforced portion 30 is provided. The third embodiment will be described below, but descriptions similar to those of the first embodiment may be omitted.

[0055] 9 and 10, the reinforcing material 20 according to this embodiment is a flat plate with a quadrangular outer shape, and has a generally U-shaped shape in which a rectangular cutout formed on one side of the quadrangle is connected to a circular opening formed in the center of the plate. In this reinforcing material 20, the portion excluding the circular opening in the center and the rectangular cutout is the periphery-hole reinforcement portion 21, and the cutout portion is the non-reinforced portion 30.

[0056] The hole periphery reinforcing portion 21 has an arcuate side 22 formed along the periphery of the through hole 14, and as shown in FIG. 10, the arcuate side 22 has two end points 24.

[0057] As shown in Figure 11, in this embodiment as well, the reinforcement material 20 is positioned so that the periphery of the through hole 14 and the position of the arc side 22 coincide with each other, and the steel beam 10 and the reinforcement material 20 are fastened with a bolt or the like at the fastening portion 23 located within the fastening region R2.

[0058] FIG. 12 is a diagram for explaining the definition of the fastening region R2 (second region) according to this embodiment. However, since the method of defining the fastening region R2 is similar to that in the first embodiment, the description thereof will be omitted.

[0059] However, in this embodiment, unlike the first embodiment, there is only one unreinforced portion 30, so that the center line C of the through hole 14 is y However, the end point 24 of the arc side 22 does not exist on the left side of the line (α x Since the intersections of the line 14 and the through hole 14 are circular edge intersections P, there are four circular edge intersections P as in the first embodiment.

[0060] The reinforcement structure 1 according to this embodiment is configured as described above. With this reinforcement structure 1, the number of unreinforced portions 30 is smaller than in the reinforcement structure 1 according to the first embodiment, and therefore the reinforcement performance of the through hole 14 is improved. For this reason, the reinforcement structure 1 according to this embodiment is useful when high reinforcement performance is required. Furthermore, with this reinforcement structure 1 as well, the number of fastening points for bolts or the like can be reduced compared to conventional structures, and therefore it is possible to obtain the effect of improving workability.

[0061] Furthermore, when attaching the reinforcement members 20 to the steel beam 10, it is preferable that the unreinforced portion 30 is not only positioned in the longitudinal direction of the steel beam 10, but also that the positions of the unreinforced portion 30 do not coincide with the web surface 11a and the web surface 11b. For example, by attaching the reinforcement members 20 so that the unreinforced portion 30 of the reinforcement member 20 attached to the web surface 11a is positioned on the right side (positive side in the X-axis direction) in Fig. 12 and the unreinforced portion 30 of the reinforcement member 20 attached to the web surface 11b is positioned on the left side (negative side in the X-axis direction) in Fig. 12, the steel beam 10 as a whole will have no unreinforced portion 30 around the entire circumference of the through hole 14 (i.e., the periphery of the through hole 14 will be reinforced around the entire circumference), thereby improving the reinforcing performance.

[0062] In the reinforcing structures 1 according to the first to third embodiments described above, the reinforcing material 20 disclosed in the present application was attached to each of both sides (front side and back side) of the web 11, but reinforcing materials 20 of different shapes may be attached to one web surface 11a and the other web surface 11b.

[0063] 13, a pair of reinforcing members 20a, 20b described in the first embodiment may be attached to one web surface 11a, and a conventional reinforcing member 80 may be attached to the other web surface 11b. Even in this case, the effects described in the above embodiment can be obtained on the side of one web surface 11a.

[0064] For the same reason, as shown in FIG. 14, the reinforcing material 20 described in the third embodiment may be attached to one web surface 11a, and the conventional reinforcing material 80 may be attached to the other web surface 11b.

[0065] Although the embodiment of the present invention has been described above, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or altered examples within the scope of the technical ideas described in the claims, and it is understood that these also naturally belong to the technical scope of the present invention.

[0066] For example, the components of the above-described embodiments may be combined in any manner. Any combination will naturally provide the functions and advantages of each of the components in the combination, and will also provide other functions and advantages that will be apparent to those skilled in the art from the description of this specification.

[0067] In addition, the effects described in this specification are merely explanatory or exemplary and are not limiting. In other words, the technology according to the present disclosure may achieve other effects that are apparent to a person skilled in the art from the description of this specification in addition to or in place of the above effects. [Industrial Applicability]

[0068] The present invention can be applied to reinforcement of through holes in beams in steel frame structures. [Explanation of symbols]

[0069] 1 Beam through-hole reinforcement structure 10 Steel beam 11. Web 11a Web surface 11b Web surface 12 Upper flange 13 Lower flange 14 Through hole 20 Reinforcement 20a Upper Reinforcement 20b Lower Reinforcement 21 Hole circumference reinforcement 22 Arc Edge 23 Fastening Part 24 End point of arc 25 Board material 30 Unreinforced section P circle intersection R1 first area R2 fastening area (second area)

Claims

1. A reinforcement structure for a through hole provided in a steel beam having a web and a flange, A reinforcing material including a hole periphery reinforcing portion having an arc side shaped along a part of the periphery of the through hole and a fastening portion which is a fastening portion to the web; and an unreinforced portion provided along the remainder of the periphery of the through hole, The hole periphery reinforcement portion is present between the non-reinforced portion and the flange, A beam through hole reinforcement structure, characterized in that the fastening portion is provided in at least one of the following first regions provided in the hole surrounding reinforcement portion, and in at least one of the following second regions. X-axis direction: the longitudinal direction of the steel beam Y-axis direction: A direction perpendicular to the X-axis direction when viewed from a direction perpendicular to the web surface. ・α x Line: A straight line extending in the X-axis direction passing through the end point of the arc side Circular intersection point: the above α x Intersection of the line and the through hole ・α y Line: A straight line extending in the Y-axis direction passing through the circle edge intersection point ・α x Line ': tangent line of the through hole extending in the X-axis direction ・α y Line ': tangent line of the through hole extending in the Y-axis direction First region: the α in the hole periphery reinforcement portion x Outside the line and within the α y Area outside the lines Second region: the α in the hole periphery reinforcement portion x Outside the line ' and the α y The area outside the line overlaps with the first area.

2. As the reinforcing material, an upper reinforcing material that reinforces an upper portion of the through hole and a lower reinforcing material that reinforces a lower portion of the through hole are provided, The beam through hole reinforcement structure according to claim 1 , wherein the non-reinforced portion is provided between the upper reinforcement member and the lower reinforcement member.

3. The beam through hole reinforcement structure according to claim 2 , characterized in that the plate thickness of the central portion of the hole perimeter reinforcement portion in the X-axis direction is thicker than the plate thickness of the end portions.

4. The beam through hole reinforcement structure according to claim 1 , characterized in that the non-reinforced portion is provided in only one place around the through hole.

5. A beam through hole reinforcement structure described in any one of claims 1 to 4, characterized in that the angle between a straight line extending in the Y-axis direction passing through the center of the through hole and a straight line connecting the center of the through hole and the circular edge intersection is approximately 45°.

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