Building renovation method and building

Abstract

This building renovation method includes: a detachment step in which, from a building provided with four beams (12) that extend mutually parallel and columns that respectively support the four beams (12), a column that supports the beam (12), of the four beams (12), that is not located at either end is detached; and a reinforcement step in which a reinforcement target beam (121), which is the beam (12) from which the column was detached, is reinforced. In the reinforcement step, a receiving beam (15) is placed below the reinforcement target beam (121) so as to intersect the beams (12), and the receiving beam (15) is joined to the reinforcement target beam (121). Receiving columns are placed below both ends of the receiving beam (15), and the receiving columns are joined to the receiving beam (15). The reinforcement target beams (121) and the receiving beam (15) are joined using high-strength bolts (B2). Reinforcement members (17) are placed at sections of the reinforcement target beam (121) that intersect the receiving beam (15), and the reinforcement members (17) are joined to the reinforcement target beam (121).

Description

Building renovation method and building

[0001] The present invention relates to a method for renovating a building and a building.

[0002] Patent Document 1 discloses a method for renovating a building. The building before renovation has three existing beams extending parallel to one another and columns supporting each of the three existing beams. In the renovation, the column supporting the central existing beam of the three existing beams is removed. Then, a beam-like reinforcing member is installed below the central existing beam so as to be perpendicular to the existing beam, and support columns supporting the beam-like reinforcing member are installed below both ends of the beam-like reinforcing member.

[0003] Japanese Patent Application Laid-Open No. 2021-116599

[0004] At the point where the existing beam located in the center intersects with the beam-like reinforcing member, the deformation of the existing beam and the deformation of the beam-like reinforcing member are added together, which may result in the deformation of the beam being greater than that of the building before the renovation.

[0005] (1) A method for renovating a building that is one aspect of the present disclosure includes, from a building having three or more cross members extending parallel to each other and columns supporting each of the three or more cross members, a removal process for removing the columns supporting the cross members located at any of the three or more cross members other than the two ends, and a reinforcement process for reinforcing the cross member to be reinforced, which is the cross member from which the columns have been removed. In the reinforcement process, a support cross member is placed under the cross member to be reinforced so that it intersects with the cross member, and the support cross member is joined to the cross member to be reinforced. In the reinforcement process, the cross member to be reinforced and the support cross member are joined with high-strength bolts, and a reinforcing member is placed at the part of the cross member to be reinforced that intersects with the support cross member, and the reinforcing member is joined to the cross member to be reinforced.

[0006] According to this method, the member to be reinforced and the supporting member are joined with high-strength bolts, forming a rigidly joined, integrated structure, which can suppress deformation of the member to be reinforced and the supporting member. Furthermore, at the intersection of the member to be reinforced and the supporting member, the member to be reinforced is reinforced with a reinforcing member, which can further suppress deformation of the member to be reinforced.

[0007] (2) In the building renovation method of (1) above, the cross member to be reinforced has a cross member web, an upper cross member flange provided at the upper end of the cross member web, and a lower cross member flange provided at the lower end of the cross member web, the receiving cross member has a receiving web, an upper receiving flange provided at the upper end of the receiving web, and a lower receiving flange provided at the lower end of the receiving web, and the reinforcing member has a reinforcing web, an upper reinforcing flange provided at the upper end of the reinforcing web, and a lower reinforcing flange provided at the lower end of the reinforcing web. and a flange, and in the reinforcing step, the reinforcing member is positioned so that the reinforcing web intersects with the cross member web, the upper reinforcing flange is along the upper cross member flange, and the lower reinforcing flange is along the lower cross member flange, the support cross member is positioned so that a portion of the upper support flange overlaps the lower cross member flange, the upper cross member flange and the upper reinforcing flange are joined with bolts, and the lower reinforcing flange, the lower cross member flange, and the upper support flange are joined with the high-strength bolts.

[0008] In the case of renovation, since it is necessary to join reinforcing members to the already constructed beam members to be reinforced, it is desirable that the joining work between the beam members to be reinforced and the reinforcing members be easy. According to the above method, the beam members to be reinforced and the reinforcing members are joined with bolts and high-strength bolts, so the joining work between the beam members to be reinforced and the reinforcing members is easier than when the beam members to be reinforced and the reinforcing members are joined by welding.

[0009] In addition, since the lower reinforcing flange, the lower cross member flange, and the upper receiving flange are joined together by high-strength bolts, the cross member to be reinforced and the receiving cross member can be joined at the same time as the cross member to be reinforced and the reinforcing member are joined.

[0010] (3) In the building renovation method of (2) above, the support member further has a stiffener connecting the support web, the upper support flange, and the lower support flange, and in the reinforcing step, the support member is arranged so that the stiffener is located below the support member to be reinforced. According to this method, the support member is reinforced by the stiffener at the intersection between the support member to be reinforced and the support member, thereby further suppressing deformation of the support member.

[0011] (4) In the method for renovating a building according to any one of (1) to (3) above, the vertical dimension of the supporting cross member is equal to or smaller than the vertical dimension of the cross member to be reinforced.

[0012] Because support beams are placed under the beams to be reinforced, the ceiling height of the building after renovation may be lower than that of the building before renovation by the amount of the vertical dimension of the support beams. For this reason, it is preferable that the vertical dimension of the support beams is small.

[0013] When a member to be reinforced and a supporting member are joined with bolts, a method of suppressing deformation of the member and the supporting member is to make the vertical dimensions of the supporting member equal to or greater than the vertical dimensions of the member to be reinforced. However, this tends to result in a lower ceiling height.

[0014] In contrast, when the deformation of the target beam and the supporting beam is suppressed by joining them with high-strength bolts as in the above method, the vertical dimensions of the supporting beam can be made equal to or smaller than the vertical dimensions of the target beam. Therefore, when joining the target beam and the supporting beam with bolts, it is possible to avoid a decrease in ceiling height compared to when deformation is suppressed by making the dimensions of the supporting beam equal to or larger than the dimensions of the target beam.

[0015] (5) In the method for renovating a building according to any one of (1) to (4) above, in the reinforcing step, the supporting cross member is positioned under the end cross members, which are the cross members located on both sides of the cross member to be reinforced, among the three or more cross members, so that both ends of the supporting cross member are located under the end cross members, and the supporting cross member is joined to the end cross members.

[0016] As described above, the support beam is placed under the target beam so as to intersect with the beam, and the support columns are placed under both ends of the support beam. Therefore, the load acting on the target beam is transmitted to the two support columns via the support beam. In other words, the support beam and the two support columns support the target beam in place of the column removed in the removal process.

[0017] According to the above method, both ends of the support beam are placed under the end beam, and the support columns placed under both ends of the support beam are also placed under the end beam. In addition, the support beam is joined to the end beam. Therefore, the two support columns can support not only the reinforced beam and the support beam, but also the end beam.

[0018] (6) In the building renovation method of (5) above, at least one of the end beams is an internal beam located inside the building, and in the removal process, some of the multiple columns supporting the internal beam are removed, and in the reinforcement process, the support column is placed under the internal beam so that the multiple columns placed under the internal beam are lined up at a predetermined interval.

[0019] According to this method, the internal beam is supported by a plurality of columns arranged at predetermined intervals. Therefore, even if the columns supporting the internal beam are removed in the removal process, the internal beam can be stably supported.

[0020] (7) In the building renovation method of (5) above, at least one of the end cross members is a peripheral cross member located on the periphery of the building, and in the reinforcing process, the support cross member is positioned so that the end of the support cross member is adjacent to the upper end of the column supporting the peripheral cross member in the direction in which the support cross member extends, and the support column is positioned along the column supporting the peripheral cross member, and the support column is joined to the column supporting the peripheral cross member.

[0021] According to this method, the perimeter beams are supported by the support columns in addition to the existing columns. Therefore, the perimeter beams can be supported more stably. Furthermore, by joining the support columns to the existing columns that support the perimeter beams, the stability of the support columns can be improved. Therefore, the support columns can support the support beams and the beams to be reinforced more stably.

[0022] (8) A building that is one aspect of the present disclosure comprises a cross member to be reinforced and three or more cross members including end cross members extending parallel to the cross member to be reinforced and located on both sides of the cross member to be reinforced; a support cross member positioned below the cross member to be reinforced so as to intersect with the cross members and joined to the cross member to be reinforced; and a support column positioned below both ends of the support cross member and joined to the support cross member, wherein no column is positioned below the part of the cross member to be reinforced that intersects with the support cross member, the cross member to be reinforced and the support cross member are joined by high-strength bolts, and a reinforcing member positioned at the part of the cross member to be reinforced that intersects with the support cross member and joined to the cross member to be reinforced.

[0023] According to this configuration, the beam to be reinforced and the receiving beam are joined with high-strength bolts, forming a rigidly joined, integrated structure, which can suppress deformation of the beam to be reinforced and the receiving beam. Furthermore, at the intersection between the beam to be reinforced and the receiving beam, the beam to be reinforced is reinforced with a reinforcing member, which can further suppress deformation of the beam to be reinforced.

[0024] According to the building renovation method and building disclosed herein, deformation of the cross member to be reinforced and the supporting cross member can be suppressed.

[0025] A perspective view showing the building before renovation. A plan view showing the building before renovation. A perspective view showing the building after renovation. A plan view showing the building after renovation. A cross-sectional view of the building taken along line 5-5 in Figure 4. A cross-sectional view of the building taken along line 6-6 in Figure 5. A cross-sectional view of the building taken along line 7-7 in Figure 4. A cross-sectional view of the building taken along line 8-8 in Figure 4.

[0026] 1 to 8, a method for renovating a building 10 and the building 10 according to this embodiment will be described. The building 10 according to this embodiment is a two-story residence. The method for renovating the building 10 according to this embodiment is applied to a renovation in which the layout of the first floor is changed by removing some of the columns on the first floor.

[0027] <Building before renovation> As shown in Figures 1 and 2, the building 10 before renovation has three or more cross members extending parallel to each other. In this embodiment, the building 10 before renovation has four beams 12 extending parallel to each other as the three or more cross members extending parallel to each other. In the following description, the direction in which each beam 12 extends is referred to as the first direction X. The direction in which the four beams 12 are lined up is referred to as the second direction Y. The first direction X is a direction perpendicular to the vertical direction Z. The second direction Y is a direction perpendicular to the first direction X and the vertical direction Z.

[0028] In this embodiment, the four beams 12 are provided at equal intervals in the second direction Y. The four beams 12 are provided, for example, at intervals of 2 m in the second direction Y. Between adjacent beams 12 in the second direction Y, girders 11 extending in the second direction Y are provided. The girders 11 are provided, for example, in portions of the outer periphery of the building 10 that are located at both ends in the first direction X.

[0029] When distinguishing the four beams 12, they are referred to as a first beam 12a, a second beam 12b, a third beam 12c, and a fourth beam 12d from one side to the other in the second direction Y. The first beam 12a and the fourth beam 12d are the beams 12 located at both ends of the four beams 12. The second beam 12b and the third beam 12c are the beams 12 located other than the both ends of the four beams 12.

[0030] As shown in Figures 5 and 7, each beam 12 is made of an H-shaped steel. Each beam 12 has a beam web 20 as a cross member web, an upper beam flange 21 as an upper cross member flange, and a lower beam flange 22 as a lower cross member flange. The upper beam flange 21 is provided at the upper end of the beam web 20. The lower beam flange 22 is provided at the lower end of the beam web 20.

[0031] As shown in Figures 1 and 2, the building 10 before renovation includes independent columns 13 that support beams 12 inside the building 10. The building 10 before renovation in this embodiment includes a first independent column 13a that supports the first beam 12a, a second independent column 13b that supports the second beam 12b, and a third independent column 13c that supports the third beam 12c. The first independent column 13a, the second independent column 13b, and the third independent column 13c are aligned in the second direction Y. Each independent column 13 is made of a square steel pipe.

[0032] The building 10 before renovation includes peripheral columns 14 that support beams 12 on the periphery of the building 10. The building 10 before renovation in this embodiment includes first peripheral columns 41a, 41b that support both ends of the first beam 12a in the first direction X, second peripheral columns 42a, 42b that support both ends of the second beam 12b in the first direction X, and third peripheral columns 43a, 43b that support both ends of the third beam 12c in the first direction X. The building 10 before renovation includes fourth peripheral columns 44a, 44b, 44c, 44d that support the fourth beam 12d.

[0033] The first peripheral columns 41a, 41b, the second peripheral columns 42a, 42b, and the third peripheral columns 43a, 43b are each composed of two C-shaped steels 14a adjacent to each other in the second direction Y. The two C-shaped steels 14a are arranged so that one C-shaped steel 14a opens toward one side in the second direction Y, and the other C-shaped steel 14a opens toward the other side in the second direction Y.

[0034] The fourth peripheral columns 44a, 44b, 44c, and 44d are spaced apart in the first direction X. In this embodiment, the fourth peripheral columns 44a, 44b, 44c, and 44d are spaced apart at equal intervals in the first direction X. The fourth peripheral columns 44a, 44b, 44c, and 44d are spaced apart at intervals of 2 m in the first direction X, for example.

[0035] The fourth peripheral columns 44a, 44d support both ends of the fourth beam 12d in the first direction X. Each of the fourth peripheral columns 44a, 44d is composed of two C-shaped steel beams 14a and a support column 14b located at a corner of the building 10.

[0036] The fourth peripheral columns 44b, 44c are located between the fourth peripheral columns 44a, 44d in the first direction X. The fourth peripheral column 44b is aligned with the first independent column 13a, the second independent column 13b, and the third independent column 13c in the second direction Y. The fourth peripheral column 44c is located between the fourth peripheral columns 44b, 44d. Each of the fourth peripheral columns 44b, 44c is composed of two C-shaped steels 14a adjacent to each other in the first direction X. The two C-shaped steels 14a are arranged so that one C-shaped steel 14a opens toward one side in the first direction X and the other C-shaped steel 14a opens toward the other side in the first direction X. The fourth peripheral columns 44b, 44c are each located below a portion of the fourth beam 12d that is located outdoors relative to the beam web 20 (see FIG. 8 ).

[0037] Thus, in the building 10 before renovation, the first beam 12a is supported by the first independent column 13a and the first peripheral columns 41a, 41b. The second beam 12b is supported by the second independent column 13b and the second peripheral columns 42a, 42b. The third beam 12c is supported by the third independent column 13c and the third peripheral columns 43a, 43b. The fourth beam 12d is supported by the fourth peripheral columns 44a, 44b, 44c, 44d. Therefore, the building 10 before renovation has columns supporting each of the four beams 12.

[0038] 3 and 4, the building 10 after renovation includes first to fourth beams 12a to 12d, a girder 11, first peripheral columns 41a, 41b, second peripheral columns 42a, 42b, third peripheral columns 43a, 43b, and fourth peripheral columns 44a, 44b, 44c, and 44d. The first to fourth beams 12a to 12d, the girder 11, the first peripheral columns 41a, 41b, the second peripheral columns 42a, 42b, the third peripheral columns 43a, 43b, and the fourth peripheral columns 44a, 44b, 44c, and 44d are existing components that were provided in the building 10 before renovation.

[0039] The building 10 after renovation does not include the second independent column 13b and the third independent column 13c. The second independent column 13b and the third independent column 13c are components removed from the building 10 during renovation. The second beam 12b and the third beam 12c are beams 121 to be reinforced, which are beams to be reinforced from which the columns have been removed. The first beam 12a and the fourth beam 12d are end beams 122 located on both sides of the beams to be reinforced. Therefore, the four beams 12 include two beams 121 to be reinforced and end beams 122 located on both sides of the beams 121 to be reinforced. In this embodiment, of the two end beams 122, the first beam 12a, which is one end beam 122, is an interior beam located inside the building 10, and the other end beam 122, the fourth beam 12d, is an outer periphery beam located on the periphery of the building 10. In this embodiment, the building 10 after renovation does not include the first independent column 13a. The first independent column 13a is a member that has been removed from the building 10 during renovation.

[0040] <Beams> The building 10 after renovation has beams 15 as cross-support members. The beams 15 are newly installed components through renovation. The building 10 after renovation in this embodiment has two beams 15. When distinguishing between the two beams 15, one beam 15 is referred to as the first beam 15a, and the other beam 15 is referred to as the second beam 15b.

[0041] The support beam 15 is arranged below the beam 121 to be reinforced so as to intersect with the beam 12 in a plan view. No pillar is arranged below the portion of the beam 121 to be reinforced that intersects with the support beam 15. The support beam 15 is provided from one end beam 122 to the other end beam 122. Both ends of the support beam 15 are located below the end beams 122.

[0042] Specifically, each support beam 15 is disposed below the second beam 12b and the third beam 12c so as to intersect with the second beam 12b and the third beam 12c in a plan view. No pillars are disposed below the portions of the second beam 12b and the third beam 12c that intersect with the support beam 15. Each support beam 15 extends from the first beam 12a to the fourth beam 12d. A first end 151 of each support beam 15 is located below the first beam 12a (see FIG. 7). A second end 152 of each support beam 15 is located below the fourth beam 12d (see FIG. 8).

[0043] The first support beam 15a is disposed in the first direction X at a position where the fourth peripheral column 44b is provided. The first support beam 15a is disposed in the first direction X at a position where the first independent column 13a, the second independent column 13b, and the third independent column 13c were provided. The first support beam 15a is located below the portion of the second beam 12b that was supported by the second independent column 13b and the portion of the third beam 12c that was supported by the third independent column 13c. A first end 151 of the first support beam 15a is located below the portion of the first beam 12a that was supported by the first independent column 13a.

[0044] 8, the second end 152 of the first support beam 15a is located below a portion of the fourth beam 12d that is located indoors relative to the beam web 20. The second end 152 of the first support beam 15a is adjacent to the upper end of the fourth peripheral column 44b in the direction in which the support beam 15 extends. The second end 152 of the first support beam 15a is located indoors relative to the fourth peripheral column 44b.

[0045] 3 and 4, the second support beam 15b is disposed at a position where the fourth peripheral column 44c is provided in the first direction X. The second support beam 15b is disposed closer to the first peripheral column 41b, the second peripheral column 42b, the third peripheral column 43b, and the fourth peripheral column 44d than the first support beam 15a in the first direction X. The first end 151 of the second support beam 15b is located below a portion of the first beam 12a that is positioned closer to the first peripheral column 41b than the portion supported by the first independent column 13a.

[0046] 8, the second end 152 of the second support beam 15b is located below a portion of the fourth beam 12d that is located indoors relative to the beam web 20. The second end 152 of the second support beam 15b is adjacent to the upper end of the fourth peripheral column 44c in the extension direction of the support beam 15. The second end 152 of the second support beam 15b is located indoors relative to the fourth peripheral column 44c.

[0047] As shown in Figures 5 and 6, each support beam 15 is made of an H-shaped steel. Each support beam 15 has a support web 50, an upper support flange 51, and a lower support flange 52. The upper support flange 51 is provided at the upper end of the support web 50. The lower support flange 52 is provided at the lower end of the support web 50. Each support beam 15 is positioned so that a portion of the upper support flange 51 overlaps the lower beam flange 22 of the beam 121 to be reinforced.

[0048] Each support beam 15 in this embodiment further has stiffeners 53 connecting the support web 50, the upper support flange 51, and the lower support flange 52. The stiffeners 53 are provided on both sides of the support web 50. The stiffeners 53 are located below the beam 121 to be reinforced. More specifically, the stiffeners 53 are located below the beam web 20 of the beam 121 to be reinforced. In this embodiment, the stiffeners 53 are also located below the beam web 20 of the first beam 12a (see FIG. 7). In this embodiment, the dimension of each support beam 15 in the vertical direction Z is smaller than the dimension of the beam 121 to be reinforced in the vertical direction Z.

[0049] <Support columns> As shown in Figures 3 and 4, the remodeled building 10 has support columns 16 arranged under both ends of the support beams 15. The support columns 16 are members newly installed during the remodeling. The remodeled building 10 of this embodiment has two support beams 15. Therefore, the remodeled building 10 has four support columns 16.

[0050] When distinguishing between the four support columns 16, the support column 16 arranged below the first end 151 of the first support beam 15a will be referred to as the first support column 16a. The support column 16 arranged below the second end 152 of the first support beam 15a will be referred to as the second support column 16b. The first support column 16a and the second support column 16b support the first support beam 15a. The support column 16 arranged below the first end 151 of the second support beam 15b will be referred to as the third support column 16c. The support column 16 arranged below the second end 152 of the second support beam 15b will be referred to as the fourth support column 16d. The third support column 16c and the fourth support column 16d support the second support beam 15b.

[0051] The dimension of the first support column 16a in the vertical direction Z is smaller than the dimension of the first independent column 13a in the vertical direction Z by the dimension of the first support beam 15a in the vertical direction Z. The dimension of the second support column 16b in the vertical direction Z is smaller than the dimension of the fourth peripheral column 44b in the vertical direction Z by the dimension of the first support beam 15a in the vertical direction Z. The dimension of the third support column 16c in the vertical direction Z is the same as the dimension of the first support column 16a in the vertical direction Z. The dimension of the fourth support column 16d in the vertical direction Z is the same as the dimension of the second support column 16b in the vertical direction Z.

[0052] As described above, the first end 151 of the first support beam 15a is located below the portion of the first beam 12a that was supported by the first independent column 13a. Therefore, the first support column 16a, which is located below the first end 151 of the first support beam 15a, is located below the portion of the first beam 12a that was supported by the first independent column 13a. The second end 152 of the first support beam 15a is located adjacent to the upper end of the fourth peripheral column 44b in the extension direction of the support beam 15. Therefore, the second support column 16b, which is located below the second end 152 of the first support beam 15a, is adjacent to the fourth peripheral column 44b in the extension direction of the support beam 15. The second support column 16b extends along the fourth peripheral column 44b.

[0053] The second end 152 of the second support beam 15b is disposed adjacent to the upper end of the fourth peripheral post 44c in the extension direction of the support beam 15. Therefore, the fourth support post 16d, which is disposed below the second end 152 of the second support beam 15b, is adjacent to the fourth peripheral post 44c in the extension direction of the support beam 15. The fourth support post 16d extends along the fourth peripheral post 44c.

[0054] In the remodeled building 10, the first beam 12a is supported by the first peripheral column 41a, the first support column 16a, the third support column 16c, and the first peripheral column 41b. The first peripheral column 41a, the first support column 16a, the third support column 16c, and the first peripheral column 41b are arranged at predetermined intervals in the first direction X. The first peripheral column 41a, the first support column 16a, the third support column 16c, and the first peripheral column 41b are arranged at intervals of 2m in the first direction X, for example. Therefore, the first beam 12a is supported by a plurality of columns arranged at predetermined intervals.

[0055] As shown in Fig. 7, the first support column 16a and the third support column 16c each have a column body 60 and a connection part 61 integrally formed at the upper end of the column body 60. The column body 60 is made of a square steel pipe.

[0056] As shown in Figures 4 and 8, the second support column 16b and the fourth support column 16d are each formed of two C-shaped steels 62 adjacent to each other in the first direction X. Note that Figure 8 shows only one of the two C-shaped steels 62. The two C-shaped steels 62 are arranged such that one C-shaped steel 62 opens toward one side in the first direction X, and the other C-shaped steel 62 opens toward the other side in the first direction X.

[0057] In this embodiment, the second support column 16b is joined to the fourth peripheral column 44b via a connection plate 63. The fourth support column 16d is joined to the fourth peripheral column 44c via a connection plate 63. Specifically, the connection plate 63 is disposed between the two C-shaped steels 62 that constitute the support column 16 and between the two C-shaped steels 14a that constitute the peripheral column 14. Nuts (not shown) are engaged with bolts B1 that pass through the two C-shaped steels 62 and connection plate 63 that constitute the support column 16. This joins the support column 16 and the connection plate 63. Furthermore, nuts (not shown) are engaged with bolts B1 that pass through the two C-shaped steels 62 and connection plate 63 that constitute the peripheral column 14. This joins the peripheral column 14 and the connection plate 63.

[0058] 5 and 6 , reinforcing members 17 are arranged at the portions of the beam 121 to be reinforced that intersect with the support beam 15. Specifically, the reinforcing members 17 are arranged at the portions of the second beam 12b that intersect with the first support beam 15a, the portions of the second beam 12b that intersect with the second support beam 15b, the portions of the third beam 12c that intersect with the first support beam 15a, and the portions of the third beam 12c that intersect with the second support beam 15b. One reinforcing member 17 is arranged on each side of the beam web 20 at the portions of the beam 121 to be reinforced that intersect with the support beam 15.

[0059] 7, in this embodiment, the reinforcing members 17 are also provided at the portion of the first beam 12a that intersects with the support beam 15. The reinforcing members 17 are arranged one on each side of the beam web 20 at the portion of the first beam 12a that intersects with the support beam 15.

[0060] The reinforcing member 17 has a reinforcing web 70, an upper reinforcing flange 71, and a lower reinforcing flange 72. The upper reinforcing flange 71 is provided at the upper end of the reinforcing web 70. The lower reinforcing flange 72 is provided at the lower end of the reinforcing web 70. The reinforcing member 17 is arranged so that the reinforcing web 70 intersects with the beam web 20, the upper reinforcing flange 71 is along the lower surface of the upper beam flange 21, and the lower reinforcing flange 72 is along the upper surface of the lower beam flange 22. The reinforcing member 17 is arranged so that the reinforcing web 70 is located above the support web 50 of the support beam 15.

[0061] As shown in Figure 4, the renovated building 10 has a plurality of openings A in plan view. Each opening A is defined by adjacent girders 11 or support beams 15 in the first direction X and adjacent beams 12 in the second direction Y. As shown by the two-dot chain lines in Figure 4, each opening A has two diagonally extending braces 18 intersecting each other.

[0062] 5, plate-shaped brace brackets 19 are fixed to each end of the brace 18. The brace brackets 19 are disposed along the upper surface of the lower reinforcing flange 72 of the reinforcing member 17.

[0063] As shown in Figures 5 and 6, a nut N is engaged with a bolt B1 that penetrates the upper reinforcing flange 71 of the reinforcing member 17 and the upper beam flange 21 of the beam 121 to be reinforced. A nut N is engaged with a high-strength bolt B2 that penetrates the lower reinforcing flange 72 of the reinforcing member 17, the lower beam flange 22 of the beam 121 to be reinforced, and the upper support flange 51 of the support beam 15. As a result, the reinforcing member 17 is joined to the beam 121 to be reinforced by the bolt B1 and the high-strength bolt B2. The support beam 15 is joined to the beam 121 to be reinforced by the high-strength bolt B2. Note that if a brace bracket 19 is disposed on the upper surface of the lower reinforcing flange 72 of the reinforcing member 17, the high-strength bolt B2 also penetrates the brace bracket 19. As a result, the brace 18 is joined to the beam 121 to be reinforced.

[0064] As shown in FIG. 7 , a nut N is engaged with a bolt B1 that penetrates the upper reinforcing flange 71 of the reinforcing member 17 and the upper beam flange 21 of the first beam 12a. A nut N is engaged with a high-strength bolt B2 that penetrates the lower reinforcing flange 72 of the reinforcing member 17, the lower beam flange 22 of the first beam 12a, and the upper support flange 51 of the support beam 15. As a result, the reinforcing member 17 is joined to the first beam 12a by the bolt B1 and the high-strength bolt B2. The first end 151 of the support beam 15 is joined to the first beam 12a by the high-strength bolt B2. Note that if a brace bracket 19 is disposed on the upper surface of the lower reinforcing flange 72 of the reinforcing member 17, the high-strength bolt B2 also penetrates the brace bracket 19. As a result, the brace 18 is joined to the first beam 12a.

[0065] A nut N is engaged with a bolt B1 that passes through the connection portion 61 of the support column 16 and the lower support flange 52 of the support beam 15. In this way, the support column 16 is joined to the first end portion 151 of the support beam 15.

[0066] As shown in Figure 8, a nut N is engaged with a bolt B1 that passes through the lower beam flange 22 of the fourth beam 12d and the upper receiving flange 51 of the receiving beam 15. As a result, the second end 152 of the receiving beam 15 is joined to the fourth beam 12d by the bolt B1.

[0067] A nut N is engaged with a bolt B1 that passes through the support column 16 and the lower support flange 52 of the support beam 15. This joins the support column 16 to the second end 152 of the support beam 15. <Method for renovating a building> A method for renovating a building 10 will now be described. The renovation of the building 10 is carried out by workers. The method for renovating a building 10 includes a removal process and a reinforcement process.

[0068] The removal process is a process of removing columns supporting cross members located other than both ends of three or more cross members extending parallel to one another from the pre-renovation building 10. As described above, in this embodiment, of the four beams 12 extending parallel to one another, the beams 12 located other than both ends are the second beam 12b and the third beam 12c. In the removal process of this embodiment, the second independent column 13b supporting the second beam 12b and the third independent column 13c supporting the third beam 12c are removed.

[0069] As a result, the second beam 12b and the third beam 12c each become a beam to be reinforced 121 from which the column has been removed. The first beam 12a and the fourth beam 12d become end beams 122 located on both sides of the beam to be reinforced 121. The first beam 12a is an interior beam located inside the building 10. The fourth beam 12d is an outer periphery beam located on the outer periphery of the building 10.

[0070] In the removal step of this embodiment, some of the columns supporting the interior cross members are also removed. Specifically, of the first outer peripheral column 41a, the first independent column 13a, and the first outer peripheral column 41b supporting the first beam 12a, the first independent column 13a is removed.

[0071] The reinforcing process is a process of reinforcing the beam 121 to be reinforced. In the reinforcing process, a support beam 15 is placed below the beam 121 to be reinforced so as to intersect with the beam 12. In the reinforcing process of this embodiment, a first support beam 15a and a second support beam 15b are placed below the second beam 12b and the third beam 12c so as to be perpendicular to the beam 12. In the reinforcing process of this embodiment, the support beam 15 is placed so that the stiffeners 53 of the support beam 15 are located below the second beam 12b and the third beam 12c.

[0072] In the reinforcing step, the support beams 15 are positioned so that both ends of the support beams 15 are located below the end beams 122. That is, the support beams 15 are positioned so that both ends of the support beams 15 are located below the first beams 12a and the fourth beams 12d. In the reinforcing step of this embodiment, the first support beams 15a are positioned so that the second end 152 of the first support beam 15a is adjacent to the upper end of the fourth peripheral column 44b in the extension direction of the support beams 15. The second support beams 15b are positioned so that the second end 152 of the second support beam 15b is adjacent to the fourth peripheral column 44c in the extension direction of the support beams 15.

[0073] In the reinforcing process, support columns 16 are placed under both ends of the support beam 15. Specifically, in the reinforcing process, a first support column 16a and a second support column 16b are placed under both ends of the first support beam 15a. A third support column 16c and a fourth support column 16d are placed under both ends of the second support beam 15b. In the reinforcing process of this embodiment, the support beam 15 is placed so that a portion of the upper support flange 51 of the support beam 15 overlaps the lower beam flange 22 of the beam 121 to be reinforced.

[0074] In the reinforcing step of this embodiment, support columns 16 are arranged under the first beams 12a, which are internal cross members, so that the multiple columns arranged under the first beams 12a are lined up at a predetermined interval. Specifically, the first support columns 16a and the third support columns 16c are arranged under the first beams 12a so that the first peripheral column 41a, the first support column 16a, the third support column 16c, and the first peripheral column 41b are lined up at a predetermined interval.

[0075] In the reinforcement process of this embodiment, support columns 16 are arranged along the perimeter columns 14 that support the fourth beams 12d, which are the perimeter cross members. Specifically, the second support column 16b is arranged along the fourth perimeter column 44b. The fourth support column 16d is arranged along the fourth perimeter column 44c.

[0076] In the reinforcing step, reinforcing members 17 are placed at the portions of the beam 121 to be reinforced that intersect with the support beams 15. Specifically, reinforcing members 17 are placed at the portions of the second beam 12b that intersect with the first support beam 15a, the portions of the second beam 12b that intersect with the second support beam 15b, the portions of the third beam 12c that intersect with the first support beam 15a, and the portions of the third beam 12c that intersect with the second support beam 15b.

[0077] In the reinforcing process of this embodiment, the reinforcing member 17 is positioned so that the reinforcing web 70 intersects with the beam web 20, the upper reinforcing flange 71 is along the upper beam flange 21, and the lower reinforcing flange 72 is along the lower beam flange 22. In addition, the reinforcing member 17 is positioned so that the reinforcing web 70 is located above the support web 50 of the support beam 15.

[0078] In the reinforcing process, the reinforcing member 17 is joined to the beam 121 to be reinforced, and the support beam 15 is joined to the beam 121 to be reinforced with high-strength bolts B2. In this embodiment, nuts N are locked onto bolts B1 that penetrate the upper beam flange 21 of the beam 121 to be reinforced and the upper reinforcing flange 71 of the reinforcing member 17. Nuts N are also locked onto high-strength bolts B2 that penetrate the lower reinforcing flange 72 of the reinforcing member 17, the lower beam flange 22 of the beam 121 to be reinforced, and the upper support flange 51 of the support beam 15. As a result, the reinforcing member 17 is joined to the beam 121 to be reinforced with bolts B1 and high-strength bolts B2, and the support beam 15 is joined to the beam 121 to be reinforced with high-strength bolts B2.

[0079] In the reinforcement process, the support beams 15 are joined to the end beams 122. Specifically, the first end 151 of each support beam 15 is joined to the first beam 12a with a high-strength bolt B2, and the second end 152 of each support beam 15 is joined to the fourth beam 12d with a bolt B1.

[0080] In the reinforcing step, two support columns 16 are joined to the support beam 15. Specifically, the first support column 16a and the second support column 16b are joined to the first support beam 15a with bolts B1. The third support column 16c and the fourth support column 16d are joined to the second support beam 15b with bolts B1. Furthermore, in the reinforcing step of this embodiment, the second support column 16b is joined to the fourth peripheral column 44b via a connecting plate 63. The fourth support column 16d is joined to the fourth peripheral column 44c via a connecting plate 63.

[0081] [Operation of this embodiment] The operation of this embodiment will be described. The building 10 before renovation has four beams 12 extending parallel to one another and columns supporting each of the four beams 12. The method for renovating the building 10 includes a removal process of removing columns supporting the beams 12 located other than at both ends of the four beams 12 from the building 10 before renovation. The beams 12 from which the columns have been removed in the removal process become beams 121 to be reinforced.

[0082] The method for renovating a building 10 includes a reinforcing step of reinforcing a beam 121 to be reinforced. In the reinforcing step, a support beam 15 is placed below the beam 121 to be reinforced so that it intersects with the beam 12, and the support beam 15 is joined to the beam 121 to be reinforced. Also in the reinforcing step, support columns 16 are placed below both ends of the support beam 15, and the support columns 16 are joined to the support beam 15. As a result, the load applied to the beam 121 to be reinforced is transmitted to the two support columns 16 via the support beams 15. In other words, the support beam 15 and the two support columns 16 support the beam 121 to be reinforced in place of the column removed in the removal step.

[0083] In the reinforcing step of this embodiment, the beam to be reinforced 121 and the support beam 15 are joined with high-strength bolts B2. As a result, the beam to be reinforced 121 and the support beam 15 are rigidly joined together to form an integrated structure, which makes it possible to suppress deformation of the beam to be reinforced 121 and the support beam 15.

[0084] Furthermore, in the reinforcing step of this embodiment, the reinforcing member 17 is placed at the portion of the beam 121 to be reinforced that intersects with the support beam 15, and the reinforcing member 17 is joined to the beam 121 to be reinforced. As a result, the beam 121 to be reinforced is reinforced by the reinforcing member 17 at the portion where the beam 121 to be reinforced intersects with the support beam 15, and deformation of the beam 121 to be reinforced can be further suppressed.

[0085] [Effects of this embodiment] The effects of this embodiment will be described. (1) The method for renovating a building 10 includes a removal process and a reinforcement process. The removal process is a process of removing, from a building 10 including four beams 12 extending parallel to one another and columns supporting each of the four beams 12, the columns supporting the beams 12 located at positions other than both ends of the four beams 12. The reinforcement process is a process of reinforcing a beam 121 to be reinforced, which is a beam 12 from which the columns have been removed. In the reinforcement process, a support beam 15 is placed below the beam 121 to be reinforced so as to intersect with the beam 12, and the support beam 15 is joined to the beam 121 to be reinforced. In the reinforcement process, support columns 16 are placed below both ends of the support beam 15, and the support columns 16 are joined to the support beam 15.

[0086] In the reinforcing step of this embodiment, the beam 121 to be reinforced and the support beam 15 are joined by high-strength bolts B2. Also, in the reinforcing step of this embodiment, a reinforcing member 17 is placed at the portion of the beam 121 to be reinforced that intersects with the support beam 15, and the reinforcing member 17 is joined to the beam 121 to be reinforced.

[0087] According to this method, the beam to be reinforced 121 and the support beam 15 are joined by the high-strength bolts B2, so that the beam to be reinforced 121 and the support beam 15 have a rigidly joined, integrated structure, which makes it possible to suppress deformation of the beam to be reinforced 121 and the support beam 15. Furthermore, at the portion where the beam to be reinforced 121 and the support beam 15 intersect, the beam to be reinforced 121 is reinforced by the reinforcing member 17, which makes it possible to further suppress deformation of the beam to be reinforced 121.

[0088] (2) The beam 121 to be reinforced has a beam web 20, an upper beam flange 21 provided at the upper end of the beam web 20, and a lower beam flange 22 provided at the lower end of the beam web 20. The support beam 15 has a support web 50, an upper support flange 51 provided at the upper end of the support web 50, and a lower support flange 52 provided at the lower end of the support web 50. The reinforcing member 17 has a reinforcing web 70, an upper reinforcing flange 71 provided at the upper end of the reinforcing web 70, and a lower reinforcing flange 72 provided at the lower end of the reinforcing web 70.

[0089] In the reinforcing process, the reinforcing member 17 is positioned so that the reinforcing web 70 intersects with the beam web 20, the upper reinforcing flange 71 is along the upper beam flange 21, and the lower reinforcing flange 72 is along the lower beam flange 22. The support beam 15 is also positioned so that a portion of the upper receiving flange 51 overlaps the lower beam flange 22. Then, the upper beam flange 21 and the upper reinforcing flange 71 are joined with bolts B1, and the lower reinforcing flange 72, the lower beam flange 22, and the upper receiving flange 51 are joined with high-strength bolts B2.

[0090] In the case of renovation, since it is necessary to join the reinforcing member 17 to the already constructed beam 121 to be reinforced, it is desirable that the joining work between the beam 121 to be reinforced and the reinforcing member 17 be easy. According to the above method, the beam 121 to be reinforced and the reinforcing member 17 are joined by the bolt B1 and the high-strength bolt B2, so the joining work between the beam 121 to be reinforced and the reinforcing member 17 is easier than when the beam 121 to be reinforced and the reinforcing member 17 are joined by welding.

[0091] In addition, since the lower reinforcing flange 72, the lower beam flange 22, and the upper receiving flange 51 are joined together by high-strength bolt B2, the beam to be reinforced 121 and the receiving beam 15 can be joined at the same time as the beam to be reinforced 121 and the reinforcing member 17 are joined.

[0092] (3) The support beam 15 has stiffeners 53 that connect the support web 50, the upper support flange 51, and the lower support flange 52. In the reinforcement process, the support beam 15 is positioned so that the stiffeners 53 are located below the beam 121 to be reinforced.

[0093] According to this method, the support beam 15 is reinforced by the stiffener 53 at the portion where the beam 121 to be reinforced and the support beam 15 intersect, thereby further suppressing deformation of the support beam 15. (4) The dimension of the support beam 15 in the vertical direction Z is equal to or less than the dimension of the beam 12 in the vertical direction Z.

[0094] Since the support beams 15 are placed under the beams 121 to be reinforced, there is a risk that the ceiling height of the building 10 after renovation will be lower than that of the building 10 before renovation by the amount of the dimension of the support beams 15 in the vertical direction Z. For this reason, it is preferable that the dimension of the support beams 15 in the vertical direction Z is small.

[0095] When the beam 121 to be reinforced and the support beam 15 are joined by the bolt B1, a method of suppressing deformation of the beam 121 to be reinforced and the support beam 15 can be considered, for example, by making the dimension of the support beam 15 in the vertical direction Z equal to or greater than the dimension of the beam 121 to be reinforced in the vertical direction Z. However, in this case, the ceiling height is likely to be low.

[0096] In contrast, when the beam 121 to be reinforced and the support beam 15 are joined with high-strength bolts B2 as in this embodiment to suppress deformation of the beam 121 to be reinforced and the support beam 15, the dimension of the support beam 15 in the vertical direction Z can be made equal to or smaller than the dimension of the beam 121 to be reinforced in the vertical direction Z. Therefore, when the beam 121 to be reinforced and the support beam 15 are joined with bolts B1, it is possible to avoid the ceiling height being lower than when deformation is suppressed by making the dimension of the support beam 15 equal to or larger than the dimension of the beam 121 to be reinforced.

[0097] (5) In the reinforcement process, of the four beams 12, the support beams 15 are positioned so that both ends of the support beams 15 are located under the end beams 122 located at both ends of the beam 121 to be reinforced, and the support beams 15 are joined to the end beams 122.

[0098] According to this method, both ends of the support beam 15 are positioned below the end beams 122, and therefore the support columns 16 positioned below both ends of the support beam 15 are positioned below the end beams 122. In addition, the support beam 15 is joined to the end beams 122. Therefore, the two support columns 16 can support not only the beam to be reinforced 121 and the support beam 15, but also the end beams 122.

[0099] (6) The first beam 12a, which is the end beam 122, is an internal cross member located inside the building 10. In the removal process, of the first peripheral column 41a, first independent column 13a, and first peripheral column 41b that support the first beam 12a, the first independent column 13a is removed. In the reinforcement process, the first support column 16a and the third support column 16c are arranged below the first beam 12a so that the first peripheral column 41a, the first support column 16a, the third support column 16c, and the first peripheral column 41b arranged below the first beam 12a are aligned at a predetermined interval.

[0100] According to this method, the first beam 12a is supported by a plurality of columns arranged at predetermined intervals, so that the first beam 12a can be stably supported even after the first independent columns 13a are removed in the removal process.

[0101] (7) The fourth beam 12d, which is the end beam 122, is a periphery cross member located on the periphery of the building 10. In the reinforcement process, the support beam 15 is positioned so that the second end 152 of the support beam 15 is adjacent to the upper end of the periphery column 14 supporting the fourth beam 12d in the extension direction of the support beam 15, and the support column 16 is positioned along the periphery column 14 supporting the fourth beam 12d. Then, the support column 16 is joined to the periphery column 14 supporting the fourth beam 12d.

[0102] According to this method, the fourth beam 12d is supported by the support columns 16 in addition to the existing perimeter columns 14. Therefore, the fourth beam 12d can be supported more stably. Furthermore, by joining the support columns 16 to the perimeter columns 14, the stability of the support columns 16 can be improved. Therefore, the support columns 16 can support the support beam 15 and the beam to be reinforced 121 more stably.

[0103] (8) According to the method for renovating the building 10 of this embodiment, an effect of suppressing deformation of the beam 121 to be reinforced and the supporting beam 15 can be obtained to the same extent as in the case of a lattice beam structure in which an orthogonal beam perpendicular to the beam 12 is provided on the same plane as the beam 12 and the beam 12 is rigidly joined by welding.

[0104] (9) As a method for ensuring the strength of the remodeled building 10 to the same level as in this embodiment, instead of the above-described reinforcement process, it is possible to install beams 12 with a larger cross-sectional area than the beams 12 of the building 10 before the renovation, with the spacing between the beams 12 being smaller than that of the building 10 before the renovation. However, in this case, it is necessary to remove the beams 12 from the building 10 before the renovation and install new beams 12. Therefore, even if the renovation changes the layout of the first floor, it will also affect the floor of the second floor, resulting in a large-scale construction project. In contrast, in this embodiment, the renovation can be carried out while leaving the beams 12 of the building 10 before the renovation, thereby avoiding the need for large-scale construction work.

[0105] (10) When the beam to be reinforced 121 and the support beam 15 are joined with bolt B1, the amount of deformation of the beam to be reinforced 121 and the support beam 15 is likely to be large. Therefore, if both the second independent column 13b and the third independent column 13c are removed as in the present embodiment, it may be difficult to ensure the strength of the building 10. In contrast, the method for renovating the building 10 of the present embodiment can reduce the amount of deformation of the beam to be reinforced 121 and the support beam 15 compared to when the beam to be reinforced 121 and the support beam 15 are joined with bolt B1. Therefore, even if both the second independent column 13b and the third independent column 13c are removed, the strength of the building 10 can be ensured. Therefore, the method for renovating the building 10 of the present embodiment makes it possible to change the floor plan to provide a larger space than when the beam to be reinforced 121 and the support beam 15 are joined with bolt B1.

[0106] <Modifications> The above-described embodiments are examples of the methods for renovating the building 10 and the forms that the building 10 can take, and are not intended to limit the forms. The methods for renovating the building 10 and the building 10 can take forms that are different from those exemplified in the above-described embodiments. Examples include forms in which part of the configuration of the embodiment is replaced, changed, or omitted, or forms in which a new configuration is added to the embodiment. Modifications of the embodiments are shown below.

[0107] The building 10 is not limited to a two-story house. The horizontal members extending parallel to each other are not limited to the beams 12. The building 10 may have three or more girders extending parallel to each other.

[0108] The number of cross members extending parallel to each other is not limited to four and may be changed as appropriate as long as it is three or more. The number of cross members to be reinforced is not limited to two and may be changed as appropriate.

[0109] The number of support members is not limited to two and may be changed as appropriate. The support members do not have to be positioned perpendicular to the support members as long as they are positioned so as to intersect with the support members to be reinforced.

[0110] The columns removed in the removal process are not limited to the independent columns 13, but may also be the perimeter columns 14. The first support beam 15a does not have to be located below the portion of the first beam 12a that was supported by the first independent column 13a. In this case, the first independent column 13a does not have to be removed in the removal process.

[0111] - The lower reinforcing flange 72 of the reinforcing member 17 may be joined to the lower cross member flange of the cross member to be reinforced using a high-strength bolt B2 or bolt B1 other than the high-strength bolt B2 that joins the lower cross member flange of the cross member to be reinforced to the upper receiving flange 51 of the receiving cross member.

[0112] The support beam may not have a stiffener 53. Even in this case, at least the effect (1) of the above embodiment can be obtained. The dimensions of the support beam in the vertical direction Z may be the same as the dimensions of the beam to be reinforced in the vertical direction Z. Even in this case, the effect (4) of the above embodiment can be obtained.

[0113] The dimensions of the support beam in the vertical direction Z may be larger than the dimensions of the beam to be reinforced in the vertical direction Z. Even in this case, at least the effect (1) of the above embodiment can be obtained. In the above embodiment, one of the two end beams is an interior beam and the other is an outer periphery beam, but this is not limited to this. Both of the two end beams may be interior beams or outer periphery beams.

[0114] The support columns 16 may be arranged at an external corner of the building 10 before renovation, as seen from the outside. In this case, the perimeter columns 14 arranged at the external corner of the building 10 before renovation may or may not be removed in the removal process. If the perimeter columns 14 arranged at the external corner of the building 10 before renovation are not removed, it is preferable that the support columns 16 be arranged along the perimeter columns 14 and joined to the perimeter columns 14.

[0115] When a splint is provided at an inside corner of the remodeled building 10 as viewed from the outside, the support column 16 may be positioned along the splint. In this case, the end of the support beam 15 and the support column 16 do not have to be located below the end beam 122. The end of the support beam 15 and the support column 16 may be located below the girder 11.

[0116] The brace 18 may be omitted. <Additional Notes> This specification discloses the following techniques.

[0117] [Appendix 1] A method of renovating a building, comprising: a removal process for removing the columns supporting the three or more cross members located other than at both ends of the three or more cross members from a building having three or more cross members extending parallel to one another and columns supporting each of the three or more cross members; and a reinforcement process for reinforcing the cross member to be reinforced, which is the cross member from which the columns have been removed; in the reinforcement process, a support cross member is placed below the cross member to be reinforced so that it intersects with the cross member, and the support cross member is joined to the cross member to be reinforced, support columns are placed below both ends of the support cross member, and the support columns are joined to the support cross member; and in the reinforcement process, the cross member to be reinforced and the support cross member are joined with high-strength bolts, and a reinforcing member is placed at the part of the cross member to be reinforced that intersects with the support cross member, and the reinforcing member is joined to the cross member to be reinforced.

[0118] [Appendix 2] In the building renovation method described in Appendix 1, the cross member to be reinforced has a cross member web, an upper cross member flange provided at the upper end of the cross member web, and a lower cross member flange provided at the lower end of the cross member web, the receiving cross member has a receiving web, an upper receiving flange provided at the upper end of the receiving web, and a lower receiving flange provided at the lower end of the receiving web, and the reinforcing member has a reinforcing web, an upper reinforcing flange provided at the upper end of the reinforcing web, and a lower reinforcing flange provided at the lower end of the reinforcing web. and in the reinforcing step, the reinforcing member is positioned so that the reinforcing web intersects with the cross member web, the upper reinforcing flange is along the upper cross member flange, and the lower reinforcing flange is along the lower cross member flange, the support cross member is positioned so that a portion of the upper support flange overlaps the lower cross member flange, the upper cross member flange and the upper reinforcing flange are joined with bolts, and the lower reinforcing flange, the lower cross member flange, and the upper support flange are joined with the high-strength bolts.

[0119] [Appendix 3] In the method for renovating a building described in Appendix 2, the support cross member further has a stiffener connecting the support web, the upper support flange, and the lower support flange, and in the reinforcing process, the support cross member is positioned so that the stiffener is located below the cross member to be reinforced.

[0120] [Supplementary Note 4] In the method for renovating a building described in Supplementary Note 1, the vertical dimension of the supporting cross member is equal to or smaller than the vertical dimension of the cross member to be reinforced.

[0121] [Appendix 5] In the building renovation method described in Appendix 1, in the reinforcing step, the end cross members, which are the cross members located on both sides of the cross member to be reinforced among the three or more cross members, are positioned so that both ends of the support cross member are located under the end cross members, and the support cross members are joined to the end cross members.

[0122] [Appendix 6] In the method for renovating a building described in Appendix 5, at least one of the end cross members is an internal cross member located inside the building, and in the removal process, some of the multiple columns supporting the internal cross member are removed, and in the reinforcement process, the support column is arranged under the internal cross member so that the multiple columns arranged under the internal cross member are lined up at a predetermined interval.

[0123] [Appendix 7] In the building renovation method described in Appendix 5, at least one of the end cross members is a periphery cross member located on the periphery of the building, and in the reinforcing step, the support cross member is positioned so that the end of the support cross member is adjacent to the upper end of the column supporting the periphery cross member in the direction in which the support cross member extends, and the support column is positioned along the column supporting the periphery cross member, and the support column is joined to the column supporting the periphery cross member.

[0124] [Appendix 8] A building comprising a cross member to be reinforced and three or more cross members including end cross members extending parallel to the cross member to be reinforced and located on both sides of the cross member to be reinforced, a support cross member arranged below the cross member to be reinforced so as to intersect with the cross members and joined to the cross member to be reinforced, and support columns arranged below both ends of the support cross member and joined to the support cross member, wherein no columns are arranged below the part of the cross member to be reinforced that intersects with the support cross member, the cross member to be reinforced and the support cross member are joined with high-strength bolts, and the building comprises a reinforcing member arranged at the part of the cross member to be reinforced that intersects with the support cross member and joined to the cross member to be reinforced.

[0125] 10...building, 12...beam as cross member, 12a...first beam as interior cross member, 12d...fourth beam as outer periphery cross member, 13...independent column as column, 14...periphery column as column, 15...support beam as support cross member, 16...support column, 17...reinforcing member, 20...beam web as cross member web, 21...upper beam flange as upper cross member flange, 22...lower beam flange as lower cross member flange, 50...support web, 51...upper support flange, 52...lower support flange, 53...stiffener, 70...reinforcing web, 71...upper reinforcing flange, 72...lower reinforcing flange, 121...beam to be reinforced as cross member to be reinforced, 122...end beam as end cross member, B1...bolt, B2...high strength bolt.

Claims

1. A method of renovating a building, comprising: a removal process for removing the columns supporting the three or more cross members located other than at the two ends of the three or more cross members from a building that has three or more cross members extending parallel to one another and columns supporting each of the three or more cross members; and a reinforcement process for reinforcing the cross member to be reinforced, which is the cross member from which the columns have been removed; wherein the reinforcement process involves placing a support cross member below the cross member to be reinforced so that it intersects with the cross member and joining the support cross member to the cross member to be reinforced; placing support columns below both ends of the support cross member and joining the support columns to the support cross member; and wherein the reinforcement process involves joining the cross member to the support cross member with high-strength bolts; placing a reinforcing member at the part of the cross member to be reinforced that intersects with the support cross member and joining the reinforcing member to the cross member to be reinforced.

2. The cross member to be reinforced has a cross member web, an upper cross member flange provided at the upper end of the cross member web, and a lower cross member flange provided at the lower end of the cross member web; the support cross member has a support web, an upper support flange provided at the upper end of the support web, and a lower support flange provided at the lower end of the support web; the reinforcing member has a reinforcing web, an upper reinforcing flange provided at the upper end of the reinforcing web, and a lower reinforcing flange provided at the lower end of the reinforcing web; and in the reinforcing step, the reinforcing member is arranged so that the reinforcing web intersects with the cross member web, the upper reinforcing flange is along the upper cross member flange, and the lower reinforcing flange is along the lower cross member flange; the support cross member is arranged so that a portion of the upper support flange overlaps the lower cross member flange; and the upper cross member flange and the upper reinforcing flange are joined with bolts; 2. A method for renovating a building as described in claim 1, wherein the lower reinforcing flange, the lower cross member flange, and the upper support flange are joined by the high-strength bolts.

3. A method for renovating a building as described in claim 2, wherein the support cross member further has a stiffener connecting the support web, the upper support flange, and the lower support flange, and in the reinforcing process, the support cross member is positioned so that the stiffener is located below the cross member to be reinforced.

4. A method for renovating a building described in any one of claims 1 to 3, wherein the vertical dimensions of the supporting cross member are equal to or less than the vertical dimensions of the cross member to be reinforced.

5. A method for renovating a building described in any one of claims 1 to 4, wherein in the reinforcing step, the supporting cross member is positioned so that both ends of the supporting cross member are located under the end cross members, which are the cross members located on both sides of the cross member to be reinforced, among the three or more cross members, and the supporting cross member is joined to the end cross members.

6. A method for renovating a building as described in claim 5, wherein at least one of the end cross members is an internal cross member located inside the building, and in the removal process, some of the multiple columns supporting the internal cross member are removed, and in the reinforcement process, the support column is placed under the internal cross member so that the multiple columns placed under the internal cross member are lined up at a predetermined interval.

7. A method for renovating a building as described in claim 5, wherein at least one of the end cross members is a periphery cross member located on the periphery of the building, and in the reinforcing step, the support cross member is positioned so that the end of the support cross member is adjacent to the upper end of the column supporting the periphery cross member in the direction in which the support cross member extends, and the support column is positioned along the column supporting the periphery cross member, and the support column is joined to the column supporting the periphery cross member.

8. A building comprising a cross member to be reinforced and three or more cross members including end cross members extending parallel to the cross member to be reinforced and located on both sides of the cross member to be reinforced; a support cross member positioned below the cross member to be reinforced so as to intersect with the cross members and joined to the cross member to be reinforced; and support columns positioned below both ends of the support cross member and joined to the support cross member, wherein no columns are positioned below the part of the cross member to be reinforced that intersects with the support cross member, the cross member to be reinforced and the support cross member are joined with high-strength bolts, and the building comprises a reinforcing member positioned at the part of the cross member to be reinforced that intersects with the support cross member and joined to the cross member to be reinforced.

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