Reinforcement structure of existing beams

Abstract

To provide a reinforcement structure for existing beams that can effectively and smoothly reinforce existing beams forming the building frame of an existing building. [Solution] In a building frame 10 composed of upper and lower existing beams 11, 12 and left and right existing columns 13, the lower existing beam 12 is reinforced by an existing beam reinforcement structure 100. The lower existing beam 12 is formed of steel material having a web 12A, an upper flange 12B, and a lower flange 12C. A steel axial load-bearing member 80 is attached between the upper and lower flanges, between the upper flange 12B and the lower flange 12C, at a position corresponding to the existing column 13.

Description

Technical Field

[0006] , ,

[0007] ,

[0001] The present invention relates to a reinforcing structure for an existing beam.

Background Art

[0002] For an existing building, when the weight of the building increases due to newly installing solar panels on the roof or the like, it is necessary to reinforce the building structure by incorporating panels or the like into the building structure, or to reinforce the existing columns and existing beams forming the building structure.

[0003] Here, Patent Document 1 proposes a reinforcing structure for a composite beam. This reinforcing structure is formed by passing bolts through the upper and lower flanges on both sides of the web of the H-shaped steel and screwing nuts onto the bolts to fasten them to the upper and lower flanges.

Prior Art Documents

Patent Documents

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] Since the reinforcing structure of the composite beam described in Patent Document 1 reinforces a beam made of H-shaped steel forming a new building, relatively simple construction such as dropping bolts from above the upper flange into the bolt holes on both the upper and lower flanges of the H-shaped steel is possible.

[0006] Therefore, it cannot cope with the formation of a reinforcing structure that is difficult to reinforce, such as the reinforcement of an existing beam forming the building structure of the above-described existing building where various members are already assembled.

[0007] This invention has been made in view of the above problems, and aims to provide a reinforcement structure for existing beams that can effectively and smoothly reinforce existing beams that form the building frame of an existing building. [Means for solving the problem]

[0008] To achieve the above objective, one embodiment of the reinforcement structure for existing beams according to the present invention is: In a building frame composed of existing beams above and below and existing columns on the left and right, the existing beam below is reinforced, and this is a reinforcement structure for an existing beam. The aforementioned lower existing beam is formed from a steel material comprising a web, an upper flange, and a lower flange. A steel, axial load-bearing member is attached between the upper and lower flanges, at a position corresponding to the existing column.

[0009] According to this embodiment, with respect to a reinforcing structure for an existing lower beam that forms a building frame and is subjected to a larger load than other members, a steel, axial load-supporting member is attached between the upper and lower flanges that form the existing beam, at a position corresponding to the existing column, thereby enabling effective reinforcement of the existing beam with a relatively simple reinforcing member.

[0010] Furthermore, by installing load-bearing members between the upper and lower flanges and at a position corresponding to the existing column, for example by inserting the load-bearing members between the upper and lower flanges from the side or below the existing beam, it is possible to smoothly install load-bearing members and form a reinforced structure even when reinforcing existing beams at the bottom of a building frame, which are generally difficult to reinforce.

[0011] Here, "the position between the upper and lower flanges that corresponds to the existing column" includes the position directly below the existing column, as well as a position shifted laterally by several centimeters to several tens of centimeters from directly below the existing column. When the weight of the building increases, installing load-bearing members between the upper and lower flanges that are directly below the existing column can enhance the reinforcing effect of the load-bearing members on the existing beam.

[0012] Furthermore, at the position between the upper and lower flanges corresponding to the existing beam, one load-bearing member may be installed, or multiple load-bearing members may be installed. Depending on the degree of reinforcement of the existing beam against the increased load, the cross-sectional dimensions and number of load-bearing members can vary. For example, when the existing beam is formed from H-shaped steel, there are various configurations for the arrangement of multiple load-bearing members, such as one load-bearing member installed on each side of the web at the position between the upper and lower flanges corresponding to the existing column, or two load-bearing members installed on one side of the web.

[0013] Furthermore, existing beams equipped with a web, upper flange, and lower flange can be exemplified by structural steel materials such as H-beams (including I-beams) and channel steel.

[0014] Furthermore, in another embodiment of the existing beam reinforcement structure according to the present invention, The aforementioned building structure includes, A renewed load-bearing panel is incorporated into an existing load-bearing panel that has at least two existing vertical braces on the left and right and two existing horizontal braces on the top and bottom, by arranging one or two new braces that intersect within the existing panel, or A newly constructed load-bearing panel is incorporated, which includes at least two newly installed vertical supports on the left and right sides and two newly installed horizontal supports on the top and bottom. A separate load-supporting member is also attached between the upper and lower flanges at a position corresponding to the existing or newly installed vertical bar.

[0015] According to this embodiment, when a renewed load-bearing panel is incorporated into the building frame, a separate load-bearing member is attached between the upper and lower flanges at the position corresponding to the existing vertical members that are components of the panel, or when a new load-bearing panel is incorporated into the building frame, a separate load-bearing member is attached between the upper and lower flanges at the position corresponding to the new vertical members that are components of the panel. This enhances the reinforcing effect of the lower existing beams that support the load-bearing panel, in addition to the other components of the building frame.

[0016] Here, the renewed load-bearing panel is formed by installing new braces in the area where the existing braces were removed from the existing load-bearing panel.

[0017] Furthermore, in addition to a configuration that includes only two newly installed vertical braces on the left and right sides and two newly installed horizontal braces on the top and bottom, the newly installed load-bearing panel can also be configured to include one or two additional newly installed braces that intersect.

[0018] Furthermore, other embodiments of the existing beam reinforcement structure according to the present invention are: A first bolt protrudes from below the upper flange, A second bolt hole is provided in the lower flange. The load-supporting member, a first high nut having an upper end bolt hole and a lower end bolt hole, is disposed between the upper and lower flanges, and the first bolt is screwed into the upper end bolt hole. The second bolt, inserted through the second bolt hole from below the lower flange, is screwed into the lower end bolt hole.

[0019] According to this aspect, a first high nut having an upper bolt hole and a lower bolt hole as load support members is disposed between the upper and lower flanges. A first bolt protruding from below the upper flange is screwed into the upper bolt hole, and a second bolt inserted into a second bolt hole of the lower flange from below the lower flange is screwed into the lower bolt hole. Thus, the load support member can be smoothly installed from the side or below of the existing beam with respect to a desired position of the existing beam below. Further, since the load support member is attached by dry joining with bolts and nuts, welding can be made unnecessary when attaching the load support member, and the risk of fire caused by welding can be eliminated.

[0020] Another aspect of the reinforcing structure for an existing beam according to the present invention is characterized in that a washer for height adjustment having a third bolt hole into which the second bolt is screwed is interposed in a gap between the first high nut and the lower flange.

[0021] According to this aspect, by interposing a washer for height adjustment having a third bolt hole into which the second bolt is screwed in a gap between the first high nut and the lower flange, a first high nut having a length shorter than the height between the upper and lower flanges is disposed between the upper and lower flanges, and a lower gap generated when the upper bolt hole of the first high nut is screwed onto the first bolt can be closed by the washer for height adjustment.

[0022] the first bolt protrudes from below the upper flange, a first nut is attached to the lower flange, a second high nut having an upper bolt hole and a lower bolt hole, and a third bolt having a nut partially and movably screwed into the lower bolt hole form the load support member. The load support member is disposed between the upper and lower flanges, the first bolt is screwed into the upper bolt hole, and the third bolt moves with respect to the second high nut, so that the lower part of the third bolt is screwed into the first nut.

[0023] ​According to this embodiment, a load-supporting member formed by a second high nut and a third bolt having a nut that is partially movably screwed into the lower end bolt hole of the second high nut is disposed between the upper and lower flanges, and the first bolt is screwed into the upper end bolt hole of the second high nut, and the third bolt moves relative to the second high nut and its lower part is screwed into the first nut attached to the lower flange, thereby allowing the load-supporting member to be smoothly installed from the side or below of the existing beam at a desired position on the existing beam below.

[0024] Here, the first nut may be installed either above or below the lower flange. If it is installed below, a second bolt hole will be provided in the lower flange, and the first nut will be fixed at the lower position corresponding to the second bolt hole.

[0025] Furthermore, other embodiments of the existing beam reinforcement structure according to the present invention are: The third bolt is characterized by having a tall nut.

[0026] According to this embodiment, since the nut fixed to the third bolt is a tall nut, when the height between the upper and lower flanges is high, the tall nut, together with the second tall nut, can accommodate the height between the upper and lower flanges.

[0027] Furthermore, other embodiments of the existing beam reinforcement structure according to the present invention are: A first bolt protrudes from below the upper flange, The first nut is attached to the lower flange, The load-supporting member is formed by a third high nut having a bolt hole, a fourth high nut having an upper end bolt hole and a lower end bolt hole, a connecting bolt that screws into both the bolt hole of the third high nut and the upper end bolt hole of the fourth high nut, and a fourth bolt that screws into the lower end bolt hole of the fourth high nut, the load-supporting member is disposed between the upper and lower flanges, the first bolt screws into the bolt hole of the third high nut, and the lower part of the fourth bolt screws into the first nut as the fourth high nut moves relative to the connecting bolt.

[0028] According to this embodiment, a load-supporting member formed by a third high nut having a bolt hole, a fourth high nut having an upper end bolt hole and a lower end bolt hole, a connecting bolt that screws into both the bolt hole of the third high nut and the upper end bolt hole of the fourth high nut, and a fourth bolt that screws into the lower end bolt hole of the fourth high nut is disposed between the upper and lower flanges, and the first bolt screws into the bolt hole of the third high nut, and the fourth high nut moves relative to the connecting bolt so that the lower part of the fourth bolt screws into the first nut, thereby allowing the load-supporting member to be smoothly installed from the side or below of the existing beam at a desired position on the existing beam below.

[0029] Furthermore, other embodiments of the existing beam reinforcement structure according to the present invention are: The invention is characterized in that a thickness-reinforcing washer is provided at the position where the load-supporting member is attached to the upper flange and the lower flange, thereby reinforcing the flange thickness of both the upper flange and the lower flange.

[0030] According to this embodiment, thickness-reinforcing washers are provided at the positions where load-bearing members are attached to the upper and lower flanges, thereby reinforcing the flange thickness of both the upper and lower flanges. In addition to the reinforcement provided by the attachment of load-bearing members, the upper and lower flanges of the existing beam can be effectively reinforced by the thickness-reinforcing washers. [Effects of the Invention]

[0031] As can be understood from the above explanation, the existing beam reinforcement structure of the present invention makes it possible to effectively and smoothly reinforce existing beams that form the building frame of an existing building. [Brief explanation of the drawing]

[0032] [Figure 1] This is a front view of an example of a building frame before reinforcement. [Figure 2] Figure 1 is a front view showing the building frame before reinforcement, with the existing braces removed. [Figure 3]This is a front view showing an example of a new brace unit installed in the area where an existing brace was removed. [Figure 4] This is a front view of an example of a building frame reinforcement structure, including a reinforcement structure for existing beams according to the embodiment. [Figure 5] This is an enlarged view of section V in Figure 4. [Figure 6] This is a view in the direction of arrow VI in Figure 4. [Figure 7A] This is an enlarged view of the fourth section VII, and is a front view of an example of a reinforcement structure for an existing beam according to the embodiment. [Figure 7B] This is a view from the direction of arrow B in Figure 7A. [Figure 8] (a) to (c) are process diagrams illustrating the installation method of an example of a load-bearing member shown in Figures 7A and 7B, in that order. [Figure 9] (a) to (c) are process diagrams illustrating the installation methods of other examples of load-bearing members, in that order. [Figure 10] (a) through (d) are process diagrams illustrating the installation methods of yet another example of a load-bearing member. [Modes for carrying out the invention]

[0033] Hereinafter, an example of a reinforcement structure for an existing beam according to the embodiment will be described along with the overall reinforcement structure of the building frame, with reference to the attached drawings. In this specification and drawings, substantially identical components may be denoted by the same reference numerals to avoid redundant explanations.

[0034] [Reinforcement structure for building frame including reinforcement structure for existing beams according to the embodiment] Referring to Figures 1 to 10, an example of a reinforcement structure for an existing beam according to the embodiment will be described together with the overall reinforcement structure of the building frame. Here, Figure 1 is a front view of an example of a building frame before reinforcement, Figure 2 is a front view showing the state after the existing braces have been removed from the building frame shown in Figure 1 before reinforcement, and Figure 3 is a front view showing an example of a new brace unit installed in the area where the existing braces were removed. Also, Figure 4 is a front view of an example of a reinforcement structure for a building frame, including the reinforcement structure for an existing beam according to the embodiment, Figure 5 is an enlarged view of section V in Figure 4, and Figure 6 is a view in the direction of arrow VI in Figure 4. Furthermore, Figure 7A is an enlarged view of section VII of the fourth embodiment, which is a front view of an example of a reinforcement structure for an existing beam according to the embodiment, Figure 7B is a view in the direction of arrow B in Figure 7A, and Figure 8 is a process diagram illustrating the installation method of an example of a load-supporting member shown in Figures 7A and 7B, in the order of (a) to (c). Furthermore, Figure 9 is a process diagram illustrating the installation method of other examples of load-bearing members in the order of (a) to (c), and Figure 10 is a process diagram illustrating the installation method of yet another example of load-bearing members in the order of (a) to (d).

[0035] The building frame 10 shown in the illustration is, for example, a frame that makes up a two-story lightweight steel building, and is being reinforced against an increase in the building's weight due to, for example, the installation of solar panels. However, the building to be reinforced may be a one-story building or a building with three or more floors. Furthermore, there are various reasons for reinforcing an existing building that may arise from renovations of the existing building, and seismic reinforcement is one of them.

[0036] The building frame 10 in the illustrated example is, for example, a two-story frame and includes an upper existing beam 11 (steel beam) made of H-shaped steel or the like, having a web 11A, an upper flange 11B, a lower flange 11C, and reinforcing ribs 11D; a lower existing beam 12 (steel beam) made of H-shaped steel or the like, similarly having a web 12A, an upper flange 12B, a lower flange 12C, and reinforcing ribs 12D; and existing columns 13A and 13B made of a pair of square steel pipes or the like. Note that the building frame to be reinforced may be a first-story or third-story frame, and leg jigs or the like (not shown) may be attached below the lower existing beam 12.

[0037] The building frame 10 incorporates existing load-bearing panels 20 (an example of existing panels), and therefore, the building equipped with the building frame 10 shown in the illustration is an existing panel construction building.

[0038] The existing load-bearing panel 20 is equipped with two existing vertical members 21, three existing horizontal members 22, 23, and 24 located in the upper, lower, and middle sections, and two existing braces 25 that intersect. Existing gusset plates 26 are welded to both ends of the existing braces 25, and the existing gusset plates 26 are welded to the existing vertical members 21 and the existing horizontal members 22 and 23. Note that the existing braces provided in the existing load-bearing panel may be a single brace located at one diagonal position.

[0039] The existing load-bearing panels 20 are incorporated into the building frame 10 by fastening the existing vertical members 21 and existing horizontal members 22 and 23 of the existing load-bearing panels 20 to the pair of existing columns 13 and the existing upper and lower beams 11 and 12 of the building frame 10 using fasteners not shown (bolts, screws, nails, etc.).

[0040] Here, the existing vertical bars 21 and existing horizontal bars 22, 23, and 24 are formed from shaped steel materials such as channel steel and angle steel, while the existing braces 25 and existing gusset plates 26 are formed from steel plates or the like.

[0041] Furthermore, the existing load-bearing panel 20 in the illustrated example has a width t1 of 2P (where 1P represents the module width, for example, 910 mm), and a height t2 in the range of, for example, 2400 mm to 2800 mm. Here, the width t1 of the existing load-bearing panel 20 can be various other widths besides 2P in the illustrated example, such as 0.5P, 1P, 1.5P, etc.

[0042] As shown in Figure 2, in the existing load-bearing panel 20, the existing gusset plate 26 is left in place, and the end region of the existing brace 25 is cut, thereby creating a space above and below the existing horizontal rail 24 in the middle section that will become a removal region 28.

[0043] More specifically, the existing brace 25 will be cut and removed from the outside (outdoor side) of the existing building, eliminating the need for residents to vacate the premises during construction.

[0044] A new brace unit 30, as shown in Figure 3, is installed in this removal area 28.

[0045] The newly installed brace unit 30 has two intersecting newly installed braces 31 and newly installed gusset plates 34 fixed to both ends of each newly installed brace 31 by welding or the like. Each newly installed brace 31 is constructed by connecting the ends of two divided brace pieces 32 with connecting pieces 33. Alternatively, the newly installed brace unit may have a single newly installed brace and newly installed gusset plates at both ends of it.

[0046] Here, both the divided brace piece 32 and the connecting piece 33 are formed from steel plates. Furthermore, the newly installed brace may be formed from a single continuous steel plate, in addition to the configuration shown in the illustration, which consists of two divided brace pieces 32.

[0047] The width of the new brace unit 30 installed in the area 28 where the existing brace 25 of the existing load-bearing panel 20 is removed is 2P, the same as the width of the existing load-bearing panel 20.

[0048] As shown in Figure 4, the new gusset plates 34 of the new brace unit 30 are installed from the outside to each corner of the existing load-bearing panel 20, and as shown in Figure 5, the new load-bearing panel 60, formed by the two existing vertical members 21 and the two existing horizontal members 22 and 23, as well as the existing columns 13A and 13B, is joined from the outside using multiple self-drilling tapping screws 40 (an example of fasteners). In this way, the renewed load-bearing panel 60, formed by the two existing vertical members 21 and the two existing horizontal members 22 and 23 that make up the existing load-bearing panel 20, and the new brace unit 30, is incorporated into the building frame 10, forming a reinforcement structure 200 (an overall reinforcement structure for the building frame).

[0049] Although not shown in the illustration, instead of the renewed load-bearing panel 60 shown in the illustration, the entire existing load-bearing panel 20 may be removed, and a new load-bearing panel equipped with two new vertical supports on the left and right, two new horizontal supports on the top and bottom, and a new brace unit may be incorporated into the building frame 10.

[0050] Furthermore, as shown in Figure 4, load-bearing members 80A and 80B are attached to the lower existing beam 12 of the reinforced building frame 10 at positions corresponding to the existing column 13 and existing vertical rail 21, respectively, thereby forming a reinforcement structure 100 for the existing beam.

[0051] The reinforcement structure 100 for the existing beam will be explained in detail below, but the load-bearing member 80 can also be installed from the outside of the existing building, eliminating the need for residents to vacate the premises during construction.

[0052] In this way, by attaching the new brace units 30 to the existing panel 20 components and existing columns 13, and attaching the load-bearing members 80 to the lower existing beams 12 from the outside, the construction of the entire reinforcing structure 200 of the building frame, including the reinforcing structure 100 of the existing beams, can be carried out from the outside, eliminating the need for residents to vacate the premises during construction.

[0053] Furthermore, by connecting the newly installed gusset plate 34 to the existing column 13 in addition to the existing load-bearing panel 20 components, the reinforcing effect of the newly installed brace unit 30 on the building frame 10 can be further enhanced.

[0054] In the reinforcing structure 200, the intersection 36 of the two newly installed braces 31 is fastened to the existing horizontal bar 24 in the middle section with self-drilling tapping screws or bolts.

[0055] In the reinforcement structure 100, in addition to installing the new brace unit 30, as shown in Figure 6, the existing vertical bars 21 and existing columns 13 are fastened to each other via a load distribution plate 50 using multiple self-drilling tapping screws 40 (an example of fasteners), thereby achieving a stronger integration of the existing vertical bars 21 and existing columns 13.

[0056] For example, when connecting an existing vertical rail 21 and an existing column 13 using only multiple self-drilling tapping screws 40, stress may concentrate on any of the self-drilling tapping screws 40, potentially causing damage to the stress-concentrated points in the existing vertical rail 21 and existing column 13. In contrast, by applying a load-distributing plate 50 to connect the existing vertical rail 21 and existing column 13, as shown in the illustrated example, the concentration of stress on any of the self-drilling tapping screws 40 can be suppressed.

[0057] Figure 6 shows a state in which a load distribution plate 50 is installed below the existing vertical bar 21, but a load distribution plate 50 can also be installed above the existing vertical bar 21 in the same manner. In addition to installing one load distribution plate 50 each above and below, multiple load distribution plates 50 may be installed at intervals in the vertical direction.

[0058] The load-distributing plate 50 and multiple self-drilling tapping screws 40 further strengthen the integration of the existing vertical members 21 and existing columns 13. Combined with the fact that the newly installed brace unit 30 is joined to the existing vertical members 21 and the upper and lower existing horizontal members 22 and 23, as well as to the existing columns 13, this creates a reinforced structure 200 for the entire building frame, making the entire frame more strongly integrated.

[0059] According to the illustrated reinforcement structure 200 formed by a series of construction methods, a new brace unit 30 consisting of one or two intersecting new braces 31 and new gusset plates 34 fixed to both ends of the new braces 31 is installed on the outdoor side of the existing load-bearing panel 20 in the area 28 where the existing braces 25 constituting the existing load-bearing panel 20 are removed, and the new gusset plates 34 are joined to the existing vertical members 21 and existing horizontal members 22, 23 by fasteners 40 to form a renewed load-bearing panel 60. Furthermore, the lower existing beam 12, which will be explained in detail below, is reinforced with load-bearing members 80, thereby increasing the load-bearing capacity of the existing building frame 10 without requiring the eviction of existing building occupants or on-site welding.

[0060] Here, the illustrated example shows a configuration in which a new brace unit 30 is installed in the area 28 where the existing brace 25 is removed, in a building frame 10 that incorporates an existing load-bearing panel 20 equipped with an existing brace 25. However, for example, in a building frame that incorporates an existing non-load-bearing panel that does not have an existing brace, the new brace unit 30 shown in the illustration may be installed from the outside to the existing non-load-bearing panel to form a reinforcing structure (not shown).

[0061] Next, with reference to Figure 4, Figure 7A which is an enlarged view of section VII in Figure 4, Figure 7B which is a view in the direction of arrow B in Figure 7A, and Figure 8 which illustrates an example of the installation method of a load-bearing member, the reinforcing structure 100 for the lower existing beam 12 in the building frame 10 will be described.

[0062] As shown in Figures 4 and 7A, steel, axial load-bearing members 80A and 80B are attached to the lower existing beam 12, which is made of H-shaped steel forming the building frame 10, at positions corresponding to the existing columns 13 and existing vertical members 21, respectively, thereby forming a reinforcing structure 100 for the existing beam.

[0063] Here, in the illustrated example, the "position corresponding to the existing column 13" is the position directly below the existing column 13, and the "position corresponding to the existing vertical rail 21" is the position directly below the existing vertical rail 21. Note that the positions corresponding to the existing column 13 and existing vertical rail 21 to which the load-bearing member 80 is attached may be slightly shifted to the side, in addition to the position directly below each member as shown in the illustrated example.

[0064] Due to the increased weight of the building resulting from the installation of new solar panels or renovations of existing buildings, an increased load is further applied to the existing beam 12 below via the existing columns 13 and existing vertical rails 21. Therefore, as shown in the illustrated example, load-supporting members 80A and 80B are installed directly below the existing columns 13 and existing vertical rails 21 between the upper and lower flanges. The load-supporting members 80A and 80B support the upper flange 12B and effectively transmit a portion of the applied load to the foundation below (not shown) via the lower flange 12C.

[0065] As clearly shown in Figure 8(a), the first bolt 82 is attached to the upper flange 12B of the existing beam 12, and the first bolt 82 protrudes downward from the upper flange 12B.

[0066] On the other hand, a second bolt hole 12a is provided in the lower flange 12C at a position directly below the first bolt 82.

[0067] The first high nut 81 forming the load-supporting members 80A and 80B is provided with an upper bolt hole 81a and a lower bolt hole 81b. As shown in Figure 8(a), the first high nut 81 is positioned between the upper and lower flanges of the existing beam 12, and the upper bolt hole 81a of the first high nut 81 is screwed in the X1 direction to the first bolt 82 which protrudes downward.

[0068] Prior to screwing the first high nut 81 onto the first bolt 82, as shown in Figure 8(b), a thickness-reinforcing washer 84, equipped with a fourth bolt hole 84a, is attached around the first bolt 82 on the lower surface of the upper flange 12B to reinforce the flange thickness of the upper flange 12B.

[0069] Next, as shown in Figure 8(b), when inserting the second bolt 83 in the X2 direction from below the lower flange 12C through the second bolt hole 12a, a height adjustment washer 85 having a third bolt hole 85a is placed in the gap between the lower end of the first height nut 81 and the lower flange 12C, as shown in Figure 8(c).

[0070] Furthermore, a thickness-reinforcing washer 84, equipped with a fourth bolt hole 84a, is attached to the lower surface of the lower flange 12C at a position corresponding to the second bolt hole 12a, thereby reinforcing the flange thickness of the lower flange 12C.

[0071] Next, the second bolt 83 is inserted from below the lower flange 12C through the second bolt hole 12a, and the second bolt 83 is inserted through the fourth bolt hole 84a and the third bolt hole 85a and screwed into the lower end bolt hole 81b of the first high nut 81, thereby forming the load-bearing member 80B(80). The load-bearing member 80A located directly below the existing column 13 is formed by the same method.

[0072] As is clear from Figure 8, the load-bearing member 80 can be installed from the outside (outdoor side) of the existing building, so it is not necessary for the residents to vacate the premises.

[0073] Furthermore, since this is a reinforcement of the existing beam 12 that forms the existing building frame 10, there are existing members such as columns 13 above, making it difficult to attach from above. However, it becomes possible to smoothly attach it to the upper and lower flanges of the existing beam 12 from the side or below.

[0074] For example, if the existing beam 12 is a lower existing beam that constitutes the building frame 10 of an upper floor (such as the second or third floor), the load-bearing member 80 is attached by inserting the second bolt 83 through the second bolt hole 12a from below the building frame 10 and screwing it into the lower end bolt hole 81b of the first high nut 81, making the attachment of the load-bearing member 80 extremely easy.

[0075] Next, with reference to Figure 9, we will describe the installation method of other examples of load-bearing members.

[0076] As shown in Figure 9(a), a first bolt 82 is attached to the upper flange 12B of the existing beam 12, with the first bolt 82 protruding downward from the upper flange 12B. A second bolt hole 12a is provided in the lower flange 12C at a position directly below the first bolt 82, and a first nut 86 is attached to the lower surface of the lower flange 12C at a position corresponding to the second bolt hole 12a. Here, the first nut 86 may also be attached to the upper surface of the lower flange 12C.

[0077] The second high nut 87 forming the load-supporting member 80C has an upper bolt hole 87a and a lower bolt hole 87b. The upper part of the third bolt 88, which has a nut 88a screwed onto it in the middle, is screwed into the lower bolt hole 87b of the second high nut 87, and the second high nut 87 is positioned between the upper and lower flanges of the existing beam 12. The upper bolt hole 87a of the second high nut 87 is screwed in the X3 direction to the first bolt 82 which protrudes downward.

[0078] Prior to screwing the second high nut 87 onto the first bolt 82, as shown in Figure 9(b), a thickness-reinforcing washer 84, equipped with a fourth bolt hole 84a, is attached around the first bolt 82 on the lower surface of the upper flange 12B to reinforce the flange thickness of the upper flange 12B.

[0079] Next, as shown in Figure 9(b), the third bolt 88 is moved downward in the X4 direction relative to the second high nut 87, and the lower part of the third bolt 88 is screwed into the first nut 86 through the second bolt hole 12a of the lower flange 12C, thereby forming the load support member 80C as shown in Figure 9(c). Here, the nut 88a screwed into the third bolt 88 in the illustrated example may be a high nut.

[0080] Prior to screwing the third bolt 88 into the first nut 86, a thickness-reinforcing washer 84, equipped with a fourth bolt hole 84a, is attached to the upper surface of the lower flange 12C at a position corresponding to the second bolt hole 12a, thereby reinforcing the flange thickness of the lower flange 12C.

[0081] The method of attaching the load-bearing member 80C shown in Figure 9 also eliminates the need for residents to vacate the premises by attaching it from the outside of the existing building, and allows for smooth attachment of the load-bearing member 80C between the upper and lower flanges of the existing beam 12 from the side or below.

[0082] Next, with reference to Figure 10, we will describe the installation method of yet another example of a load-bearing member.

[0083] As shown in Figure 10(a), a first bolt 82 is attached to the upper flange 12B of the existing beam 12, with the first bolt 82 protruding downward from the upper flange 12B. A second bolt hole 12a is provided in the lower flange 12C at a position directly below the first bolt 82, and a first nut 86 is attached to the lower surface of the lower flange 12C at a position corresponding to the second bolt hole 12a.

[0084] The third high nut 91 forming the load-supporting member 80D is provided with a bolt hole 91a, and the fourth high nut 92 is provided with an upper end bolt hole 92a and a lower end bolt hole 92b. A connecting bolt 93 is screwed into both the bolt hole 91a of the third high nut 91 and the upper end bolt hole 92a of the fourth high nut 92, and a fourth bolt 94 is inserted into the lower end bolt hole 92b of the fourth high nut 92. The assembly is positioned between the upper and lower flanges of the existing beam 12, and the bolt hole 91a of the third high nut 91 is screwed in the X5 direction to the first bolt 82 which protrudes downward.

[0085] Prior to screwing the third high nut 91 onto the first bolt 82, as shown in Figure 10(b), a thickness-reinforcing washer 84, equipped with a fourth bolt hole 84a, is attached around the first bolt 82 on the lower surface of the upper flange 12B to reinforce the flange thickness of the upper flange 12B.

[0086] Next, as shown in Figure 10(c), the fourth height nut 92 is moved downward in the X6 direction relative to the connecting bolt 93, and the lower part of the fourth bolt 94 is screwed into the first nut 86 through the second bolt hole 12a of the lower flange 12C, thereby forming the load support member 80D as shown in Figure 10(d).

[0087] Prior to screwing the fourth bolt 94 into the first nut 86, a thickness-reinforcing washer 84, equipped with a fourth bolt hole 84a, is attached to the upper surface of the lower flange 12C at a position corresponding to the second bolt hole 12a, thereby reinforcing the flange thickness of the lower flange 12C.

[0088] The method of attaching the load-bearing member 80D shown in Figure 10 also eliminates the need for residents to vacate the premises by attaching it from the outside of the existing building, and allows for smooth attachment of the load-bearing member 80D between the upper and lower flanges of the existing beam 12 from the side or below.

[0089] Furthermore, other embodiments may be used in which other components are combined with the configurations listed in the above embodiments, and the present invention is not limited in any way to the configurations shown herein. In this regard, modifications can be made without departing from the spirit of the present invention, and can be appropriately determined according to the application form.

[0090] For example, the load-bearing member may be attached to various positions other than those corresponding to existing columns, between the upper and lower flanges of the existing beam below. Even if the load-bearing member is attached to the upper and lower flanges of the existing beam, at a position away from the existing column, the load applied to the upper flange of the existing beam from the existing column, etc., can still be transmitted to the lower flange via the web of the existing beam and the load-bearing member.

[0091] The configuration of the reinforcing structure for existing beams of this type is as follows:

[0092] In a building frame composed of existing beams above and below and existing columns on the left and right, the existing beam below is reinforced, and this is a reinforcement structure for an existing beam. The lower existing beam is formed from a steel material comprising a web, an upper flange, and a lower flange. A reinforcing structure for an existing beam, characterized in that a steel, axial load-bearing member is attached between the upper and lower flanges. [Explanation of Symbols]

[0093] 10: Building frame 11: Existing beam (existing beam above) 11A: Web 11B: Upper flange 11C: Lower flange 11D: Reinforcement Rib 12: Existing beam (existing beam below) 12A: Web 12B: Upper flange 12C: Lower flange 12D: Reinforcement Rib 12a: Second bolt hole 13, 13A, 13B: Existing columns 20: Existing load-bearing panels (existing panels) 21: Existing vertical supports 22: Existing horizontal bar on the upper level (existing horizontal bar) 23: Existing horizontal bar on the lower level (existing horizontal bar) 24: Existing horizontal bar in the middle section (existing horizontal bar) 25: Existing braces 28: Removal area 30,30A: Newly installed brace unit 31: Newly installed brace 32: Split brace piece 33: Connecting piece 34: Newly installed gusset plate 36: Intersection 40: Fasteners (self-tapping screws with drill bits) 50: Load distribution plate 60: Renewal load-bearing panel 80, 80A, 80B, 80C, 80D: Load-bearing members 81: First high nut 81a: Upper end bolt hole 81b: Lower end bolt hole 82: First bolt 83: Second bolt 84: Washer for thickness reinforcement 84a: Fourth bolt hole 85: Height adjustment washer 85a: Third bolt hole 86: First nut 87: Second high nut 87a: Upper end bolt hole 87b: Lower end bolt hole 88: Third bolt 88a: Nut (high nut) 91: Third high nut 91a: Bolt hole 92: 4th high nut 92a: Upper end bolt hole 92b: Lower end bolt hole 93: Connecting bolt 94: Fourth bolt 100: Reinforcement structure for existing beams (reinforcement structure) 200: Reinforcement structure for building frames (reinforcement structure)

Claims

1. In a building frame composed of existing beams above and below and existing columns on the left and right, the existing beam below is reinforced, and this is a reinforcement structure for an existing beam. The aforementioned lower existing beam is formed from a steel material comprising a web, an upper flange, and a lower flange. A reinforcing structure for an existing beam, characterized in that a steel, axial load-bearing member is attached between the upper and lower flanges, at a position corresponding to the existing column.

2. The aforementioned building structure includes, A renewed load-bearing panel is incorporated into an existing load-bearing panel that has at least two existing vertical supports on the left and right and two existing horizontal supports on the top and bottom, by arranging one or two newly installed braces that intersect within the existing panel, or A newly constructed load-bearing panel is incorporated, which includes at least two newly installed vertical supports on the left and right sides and two newly installed horizontal supports on the top and bottom. The existing beam reinforcement structure according to claim 1, characterized in that a separate load-bearing member is also attached between the upper and lower flanges at a position corresponding to the existing vertical bar or the newly installed vertical bar.

3. A first bolt protrudes from below the upper flange, A second bolt hole is provided in the lower flange. The load-supporting member, a first high nut having an upper end bolt hole and a lower end bolt hole, is disposed between the upper and lower flanges, and the first bolt is screwed into the upper end bolt hole. The reinforcing structure for an existing beam according to claim 1 or 2, characterized in that a second bolt inserted through the second bolt hole from below the lower flange is screwed into the lower end bolt hole.

4. The existing beam reinforcement structure according to claim 3, characterized in that a height-adjusting washer having a third bolt hole into which the second bolt is screwed is interposed in the gap between the first high nut and the lower flange.

5. A first bolt protrudes from below the upper flange, A first nut is attached to the lower flange. The load-supporting member is formed by a second high nut having an upper end bolt hole and a lower end bolt hole, and a third bolt having a nut that is partially screwed into the lower end bolt hole so as to be movable, the load-supporting member is disposed between the upper and lower flanges, the first bolt is screwed into the upper end bolt hole, and the lower part of the third bolt is screwed into the first nut as the third bolt moves relative to the second high nut. This is the reinforcing structure for an existing beam according to claim 1 or 2.

6. The reinforcing structure for an existing beam according to claim 5, characterized in that the nut of the third bolt is a tall nut.

7. A first bolt protrudes from below the upper flange, A first nut is attached to the lower flange. The load-supporting member is formed by a third high nut having a bolt hole, a fourth high nut having an upper end bolt hole and a lower end bolt hole, a connecting bolt that is screwed into both the bolt hole of the third high nut and the upper end bolt hole of the fourth high nut, and a fourth bolt that is screwed into the lower end bolt hole of the fourth high nut, the load-supporting member is disposed between the upper and lower flanges, the first bolt is screwed into the bolt hole of the third high nut, and the lower part of the fourth bolt is screwed into the first nut as the fourth high nut moves relative to the connecting bolt, the reinforcing structure for an existing beam according to claim 1 or 2.

8. The reinforcement structure for an existing beam according to claim 1 or 2, characterized in that a thickness-reinforcing washer is provided at the position where the load-supporting member is attached to the upper flange and the lower flange, to reinforce the flange thickness of both the upper flange and the lower flange.

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