Method for remodeling existing building

Abstract

To reduce cost.SOLUTION: A method for remodeling an existing building, the existing building comprising an existing upper structure, an existing lower structure integrally connected to a lower side of the existing upper structure, an existing left outer structure integrally connected to a left outer side of the existing upper structure and the existing lower structure, and an existing right outer structure integrally connected to a right outer side of the existing upper structure and the existing lower structure, the method comprising: The method comprises a new upper structure installation step for installing a new upper structure between the existing left outer structure and the existing right outer structure in the portion of the existing upper structure, and a new lower structure installation step for installing a new lower structure between the existing left outer structure and the existing right outer structure in the portion of the existing lower structure after the new upper structure installation step.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for retrofitting an existing building. [Background technology]

[0002] A method of carrying out renovation work (renovation work reusing an existing building) is known in which the exterior walls (existing exterior walls) of an existing building are left in place, and part or all of the interior structure is demolished and a new framework is constructed in the demolished area (see, for example, Patent Document 1). In such renovation work, temporary reinforcement separate from the new framework is usually constructed, and demolition work is carried out first, and after all demolition is complete, the new framework is constructed in order from the lower floors to the upper floors. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-148845 Summary of the Invention [Problem to be solved by the invention]

[0004] When demolishing the interior structure while leaving the existing exterior walls, the seismic safety of the building is significantly compromised during demolition, so it becomes necessary to construct large-scale temporary reinforcement to support the existing exterior walls, etc. This requires a large amount of temporary reinforcement materials, which increases costs.

[0005] The present invention has been made in view of the above circumstances, and has as its object to reduce costs. [Means for solving the problem]

[0006] The main invention for achieving the above-mentioned object is a method for remodeling an existing building which comprises an existing upper structure, an existing lower structure which is integrally connected to the lower part of the existing upper structure, an existing left outer structure which is integrally connected to the left outer side of the existing upper structure and the existing lower structure, and an existing right outer structure which is integrally connected to the right outer side of the existing upper structure and the existing lower structure, characterized in that the method for remodeling an existing building comprises a new upper structure installation step of installing a new upper structure between the existing left outer structure and the existing right outer structure in a portion of the existing upper structure, and after the new upper structure installation step, a new lower structure installation step of installing a new lower structure between the existing left outer structure and the existing right outer structure in a portion of the existing lower structure.

[0007] Other features of the present invention will become apparent from the description of this specification and the accompanying drawings. [Effects of the Invention]

[0008] According to the present invention, costs can be reduced. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing the configuration of an existing building 10. [Figure 2] 2A to 2F are explanatory diagrams of a general remodeling method (comparison example) for an existing building 10. FIG. [Figure 3] 1 is a schematic flow diagram of a method for remodeling an existing building 10 in this embodiment. [Figure 4] 4A to 4F are diagrams showing a method for remodeling an existing building 10 in this embodiment. [Figure 5] 5A to 5F are diagrams showing a method for remodeling an existing building 10 in this embodiment. [Figure 6] 6A to 6F are diagrams showing a first modified example of the method for remodeling the existing building 10. FIG. [Figure 7] 7A to 7D are diagrams showing a first modified example of the method for remodeling the existing building 10. FIG. [Figure 8]8A to 8F are diagrams showing a second modified example of the method for remodeling the existing building 10. FIG. [Figure 9] 9A to 9D are diagrams showing a second modified example of the method for remodeling the existing building 10. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] At least the following matters will become clear from the description of this specification and the accompanying drawings.

[0011] (Aspect 1) A method for remodeling an existing building comprising an existing upper structure, an existing lower structure integrally connected to the lower part of the existing upper structure, an existing left outer structure integrally connected to the left outer side of the existing upper structure and the existing lower structure, and an existing right outer structure integrally connected to the right outer side of the existing upper structure and the existing lower structure, characterized in that the method comprises a new upper structure installation step for installing a new upper structure between the existing left outer structure and the existing right outer structure in a portion of the existing upper structure, and after the new upper structure installation step, a new lower structure installation step for installing a new lower structure between the existing left outer structure and the existing right outer structure in a portion of the existing lower structure.

[0012] According to the method for remodeling an existing building of the first aspect, by installing the new structure from above (upper floor), the amount of temporary reinforcement (reinforcement members) can be reduced, and the need for redundant work such as replacing the temporary reinforcement can be avoided. This allows for cost reduction.

[0013] (Aspect 2) In the method for remodeling an existing building described in aspect 1, it is desirable that at least one of the new upper structure and the new lower structure includes permanent members.

[0014] According to the method for remodeling an existing building of aspect 2, permanent members can be used for reinforcement, and the amount of temporary reinforcement members can be reduced.

[0015] (Aspect 3) In the method for remodeling an existing building described in aspect 1 or aspect 2, the new upper structure installation step may include an existing upper structure demolition step for demolishing the existing upper structure, and an upper member installation step for installing an upper member between the existing left outer structure and the existing right outer structure above the space where the existing upper structure was installed after the existing upper structure demolition step.

[0016] According to the method for remodeling an existing building of aspect 3, an upper member can be installed in a portion of the existing upper structure.

[0017] (Aspect 4) In a method for remodeling an existing building as described in aspect 1 or aspect 2, the new upper structure installation step may include an upper member installation step for installing an upper member between the existing left outer structure and the existing right outer structure, and an existing upper structure demolition step for demolishing the existing upper structure below the upper member after the upper member installation step.

[0018] According to the method for remodeling an existing building of aspect 4, after the upper member is installed, the existing upper structure below it is demolished, allowing for safer demolition.

[0019] (Aspect 5) In a method for remodeling an existing building described in any of aspects 1 to 4, the new lower structure installation step may include an existing lower structure demolition step for demolishing the existing lower structure, and a lower member installation step for installing a lower member in the space between the existing left outer structure and the existing right outer structure where the existing lower structure was installed after the existing lower structure demolition step.

[0020] According to the method for remodeling an existing building of the fifth aspect, a lower member can be installed in the existing lower structure.

[0021] (Aspect 6) In a method for remodeling an existing building described in any of aspects 1 to 4, the new lower structure installation step may include a lower member installation step for installing a lower member between the existing left outer structure and the existing right outer structure, and an existing lower structure demolition step for demolishing the existing lower structure after the lower member installation step.

[0022] According to the method for remodeling an existing building of the sixth aspect, the existing lower structure can be demolished more safely.

[0023] (Aspect 7) In the method for remodeling an existing building described in aspect 6, it is desirable that the existing lower structure includes an upper part of the existing lower structure and a lower part of the existing lower structure below the upper part of the existing lower structure, and that before the lower member installation step, there is an existing lower structure upper part disassembly step for dismantling the upper part of the existing lower structure, and after the lower member installation step, there is an existing lower structure lower part disassembly step for dismantling the lower part of the existing lower structure.

[0024] According to the method for remodeling an existing building of aspect 7, the existing lower structure can be efficiently remodeled.

[0025] (Aspect 8) In a modification method described in any of aspects 1 to 7, when, in the step of installing a new lower structure, a part of the new lower structure suspended from above the new upper structure is inserted into a gap in the new upper structure and installed below the new upper structure, it is desirable to carry out this while confirming it through a simulation using three-dimensional data of the new upper structure and the new lower structure, or after confirming it.

[0026] According to the method for modifying an existing building of aspect 8, it is possible to prevent the suspended components of the new lower structure from colliding with the new upper structure, and the new lower structure can be installed reliably.

[0027] The following describes the structure of an existing building and how to remodel it, with reference to the drawings. Note that the same or equivalent components, parts, etc. shown in each drawing are designated by the same reference numerals, and redundant explanations may be omitted where appropriate.

[0028] === Implementation form === <<About the composition of the existing building>> FIG. 1 is a diagram showing the configuration of an existing building 10. In the following explanation, the up-down direction and the left-right direction are defined as shown in FIG. 1. The up-down direction is a direction along the vertical direction, with the upper side of the vertical direction being referred to as "up" and the lower side being referred to as "down." The left-right direction is a direction (horizontal direction) perpendicular to the up-down direction, with one side of the left-right direction (the side where the left exterior wall 13 (described below) is located in the existing building 10 in FIG. 1) being referred to as "left" and the opposite side being referred to as "right."

[0029] The existing building 10 shown in Figure 1 is a seven-story building. FL (Floor Level) in the figure indicates the floor surface (finished floor surface) of each floor, and RFL (Roof Floor Level) indicates the roof surface (rooftop). For simplification, the figure does not show the underground structure or bracing materials placed on the column-beam frame (a frame formed by columns 11 and beams 12, described below).

[0030] The existing building 10 has a column 11, a beam 12, a left exterior wall 13, and a right exterior wall 14.

[0031] The pillars 11 are members that support the load from above, and are provided on each floor of the existing building 10 along the vertical direction (up and down direction).

[0032] The beams 12 are components that make up the floors and roof (RFL) that determine the floors (1FL to 7FL) of the existing building 10, and are installed horizontally (left-right) between the left exterior wall 13 and the right exterior wall 14. The floors (here, beams 12) of each floor serve to divide the space within the existing building 10 into the space of that floor and the space of the floor immediately below. For example, the floor (beam 12) at the 2FL position divides the space of the second floor from the space of the first floor.

[0033] These columns 11 and beams 12 constitute the internal framework (hereinafter also referred to as the internal skeleton) of the existing building 10. In this embodiment, the framework of the top two stories of the internal skeleton of the existing building 10 (the RFL beams 12 and the 7th floor columns 11, and the 7FL beams 12 and the 6th floor columns 11) may be referred to as the "existing upper structure 15." Furthermore, the framework of the two stories below that (the 6FL beams 12 and the 5th floor columns 11, and the 5FL beams 12 and the 4th floor columns 11) may be referred to as the "existing lower structure 16." Furthermore, the upper story of the existing lower structure 16 may be referred to as the existing lower structure upper part 16a, and the lower story below that may be referred to as the existing lower structure lower part 16b.

[0034] The left exterior wall 13 is a structure (wall) that is integrally connected to the left outer side of the internal skeleton of the existing building 10, and is configured to include a column (existing column) and the like (not shown). The left exterior wall 13 corresponds to the "existing left outer structure."

[0035] The right exterior wall 14 is a structure (wall) that is integrally connected to the right exterior of the interior skeleton of the existing building 10, and is configured to include a column (existing column) and the like (not shown). The right exterior wall 14 corresponds to the "existing right exterior structure."

[0036] The exterior walls of the existing building 10 are also provided on both sides (outside) in the horizontal direction (front-to-back direction) perpendicular to the paper surface to surround the internal structure, but illustration and explanation of these are omitted here.

[0037] The existing building 10 configured as described above will be remodeled from seven stories to four stories, while retaining the existing exterior walls (here, the left exterior wall 13 and the right exterior wall 14) and the first floor. Note that the position of the floor plan will change when the building is remodeled from seven stories to four stories, but for convenience, the following explanation will use the position of the floor plan of the existing building 10 (the position of the floor plan before the remodeling).

[0038] <<Modification method (comparison example)>> Before describing the remodeling method of this embodiment, a comparative example will be described.

[0039] 2A to 2F are explanatory diagrams of a general remodeling method (comparison example) for an existing building 10. FIG.

[0040] First, as shown in FIG. 2A, temporary reinforcement members 30 (reinforcement frames, etc.) are constructed from the lower floor (here, the first floor) to the upper floor (here, the seventh floor) by shifting the street so as not to overlap with the frame of the existing building 10.

[0041] Next, the interior structure of the existing building 10 is demolished in order from the upper floors to the lower floors. For example, in FIG. 2B, the frame (columns 11 and beams 12) of the existing building 10 is demolished down to the fifth floor (5FL). In this way, as shown in FIG. 2C, the existing frame (columns 11 and beams 12) of the existing building 10 is demolished down to the second floor (2FL), leaving only the first floor.

[0042] Next, as shown in Figure 2D, a new frame (here, permanent member 22) is installed at position 4FL between left exterior wall 13 and right exterior wall 14. If reinforcing member 30 and permanent member 22 interfere with each other at this time, re-installation work of reinforcing member 30 (the part indicated by the dashed line in the figure) will be required.

[0043] Similarly, as shown in Figure 2E, permanent member 22 is installed between left exterior wall 13 and right exterior wall 14 at position 6FL. In this case, if reinforcing member 30 and permanent member 22 interfere with each other, re-laying work for reinforcing member 30 (the part shown by the dashed line in the figure) will be necessary. Furthermore, permanent member 22 is newly installed between left exterior wall 13 and right exterior wall 14 at the rooftop (RFL) position. In other words, in the comparative example, new frames (permanent members 22) are installed from the lower floor to the upper floor.

[0044] Then, after constructing the new earthquake-resistant elements (not shown), the temporary reinforcing members 30 are removed as shown in Fig. 2F, thereby completing the repair work (remodeling) of the existing building 10.

[0045] In this comparative example, during demolition work, a large-scale, independent temporary reinforcement must be constructed to support the existing exterior walls (left exterior wall 13 and right exterior wall 14) separately from the new structure. This requires a large number of reinforcement members 30 for the temporary reinforcement, resulting in high costs. Furthermore, as shown in Figures 2D and 2E, when constructing a new structure (permanent members 22) while maintaining the temporary reinforcement after the existing structure is demolished, the temporary reinforcement members 30 may interfere with the permanent members 22. In this case, the temporary reinforcement (reinforcement members 30) must be replaced, which may result in additional work and increase costs and extend the construction period.

[0046] Therefore, in the present embodiment described below, it is possible to provide efficient reinforcement and reduce costs.

[0047] <<About the modification method of this embodiment>> Fig. 3 is a schematic flow diagram of a method for remodeling an existing building 10 in this embodiment. Also, Figs. 4A to 4F and 5A to 5F are explanatory diagrams of a method for remodeling an existing building 10 in this embodiment.

[0048] In this embodiment, first, the new upper structure 50 is installed while demolishing the existing upper structure 15 (FIG. 3: S01). Specifically, first, as shown in FIG. 4A, the left exterior wall 13 and the right exterior wall 14 of the existing building 10 are left, and the top floor (RFL beams 12 and seventh floor columns 11) are demolished (corresponding to the existing upper structure demolishing step of claim 3).

[0049] Next, as shown in Fig. 4B, an upper member 52 is installed between the left exterior wall 13 and the right exterior wall 14 above the space dismantled in Fig. 4A (corresponding to the upper member installation step). Here, a new permanent member 22 (e.g., a beam) is installed at the RFL position as the upper member 52, and a temporary member (reinforcement member 30) is installed below the permanent member 22 (at the seventh floor position) for temporary reinforcement.

[0050] Next, as shown in FIG. 4C, the beams 12 of the 7th floor below the upper members 52 and the columns 11 of the 6th floor (existing upper structure 15) are demolished (corresponding to the existing upper structure demolishing step of claim 4). Then, as shown in FIG. 4D, reinforcing members 30 are installed (temporarily reinforced) between the left exterior wall 13 and the right exterior wall 14 of the 7th floor and below it (at the 6th floor position). In this way, the permanent members 22 and reinforcing members 30 are installed in the space between the top two floors where the existing upper structure 15 was located. As a result, a new upper structure 50 is constructed in the area where the existing upper structure 15 was located.

[0051] In this embodiment, dismantling and installation are performed for each layer, but two layers may be dismantled together and permanent members 22 and reinforcing members 30 may be installed (see modified examples described later).

[0052] After step S01 of installing the new upper structure 50, the new lower structure 60 is installed while dismantling the existing lower structure 16 (FIG. 3: S02).

[0053] Specifically, first, as shown in Figure 4E, the beam 12 of the 6th floor and the column 11 of the 5th floor (the upper part 16a of the existing lower structure) are dismantled (corresponding to the existing lower structure dismantling step of claim 5 and the existing lower structure upper body disassembly step of claim 7).

[0054] Next, as shown in Fig. 4F, lower member 62 is installed in the portion (space) dismantled in Fig. 4E between left exterior wall 13 and right exterior wall 14 (corresponding to the lower member installation step). Here, permanent member 22 is installed at position 6FL as lower member 62, and temporary member (reinforcement member 30) is installed below it (at the position of the fifth floor) for temporary reinforcement.

[0055] Next, as shown in Figure 5A, the beams 12 of the 5th floor and the columns 11 of the 4th floor (lower portion 16b of the existing lower structure) are dismantled (corresponding to the existing lower structure dismantling step of claim 6 and the existing lower structure lower body disassembly step of claim 7). Then, as shown in Figure 5B, reinforcing members 30 are installed between the left exterior wall 13 and the right exterior wall 14 of the 5th floor and below it (at the 4th floor position) for temporary reinforcement. As a result, a new lower structure 60 is constructed in the area where the existing lower structure 16 was installed.

[0056] Thereafter, the process of dismantling the internal framework of the existing building 10 and installing new frames (permanent members 22 and reinforcing members 30) is repeated in the same manner up to the target floor (FIG. 3: S03).

[0057] In this embodiment, after FIG. 5B, as shown in FIG. 5C, the beams 12 on the 4th floor and the columns 11 on the 3rd floor are dismantled, and as shown in FIG. 5D, permanent members 22 are installed at the 4th floor position in the part (space) dismantled in FIG. 5C, and temporary members (reinforcement members 30) are installed below them (at the 3rd floor position) for temporary reinforcement.

[0058] Next, as shown in FIG. 5E, the beams 12 on the 3rd floor and the columns 11 on the second floor are dismantled, and reinforcing members 30 are installed between the left and right exterior walls 13 and 14 of the 3rd floor and below them (at the second floor position) for temporary reinforcement.

[0059] Then, when work is completed up to the target floor (story), earthquake-resistant elements are installed and the temporary reinforcement members 30 are removed (FIG. 3: S04). Here, as shown in FIG. 5F, earthquake-resistant walls 40 are installed as earthquake-resistant elements, and the reinforcement members 30 are dismantled and removed. This allows the existing building 10 to be remodeled from seven stories to four stories, while leaving the existing exterior walls (left exterior wall 13, right exterior wall 14) and the first floor intact.

[0060] As described above, in this embodiment, while demolishing the existing building 10 from the upper floors, new structural members (permanent members 22) are installed between the remaining exterior walls (left exterior wall 13 and right exterior wall 14), and temporary reinforcement (reinforcement members 30) is added using the new structural members.

[0061] In this way, starting from the upper floors, the process of "demolition → installation of new members and temporary reinforcement → demolition" is repeated. This allows the temporary reinforcement (reinforcement members 30) to be attached directly to the new frame (permanent members 22), making it possible to perform reinforcement efficiently. Therefore, compared to the comparative example (FIGS. 2A to 2F), the amount of reinforcement members 30 can be reduced, leading to cost savings.

[0062] Furthermore, in this embodiment, since the new permanent members 22 are installed first, there is no interference with the temporary reinforcement (reinforcement members 30). Therefore, there is no need to perform redundant work such as replacing the temporary reinforcement.

[0063] In this embodiment, the RFL beams 12 and the columns 11 on the 7th floor are demolished first, with the expectation that the columns (not shown) of the existing exterior walls (left exterior wall 13 and right exterior wall 14) will have sufficient strength. However, in this case, the upper ends of the exterior walls (here, the left exterior wall 13 and right exterior wall 14) will be self-supporting and may collapse.

[0064] Therefore, before starting demolition of the existing upper structure 15, an upper member 52 (temporary reinforcement member 30 or permanent member 22) may be installed so as not to overlap with the position of the RFL (beam 12) of the existing building 10 (for example, at a slightly higher position).

[0065] After the upper member 52 is installed, the existing upper structure 15 may be dismantled, and the reinforcing member 30, the permanent member 22, etc. may be installed in the dismantled portion. This makes it possible to prevent the exterior walls (left exterior wall 13 and right exterior wall 14) from collapsing, allowing for safer remodeling.

[0066] Incidentally, when installing a new frame from an upper floor as in this embodiment, a part of the new lower structure 60 (for example, the permanent member 22) is suspended from above by a crane or the like, inserted into a gap in the frame of the upper floor (the new upper structure 50), and placed on the lower floor (below the new upper structure 50). In such a case, it is desirable to carry out the procedure while or after confirming that the insertion is possible by performing a simulation using three-dimensional data of the new upper structure 50 and the new lower structure 60. This makes it possible to prevent the suspended members of the new lower structure 60 from colliding with the new upper structure 50, and ensures that the new lower structure 60 can be installed reliably.

[0067] The order in which the floor slabs (concrete) are poured at the position of the permanent members 22 is not particularly limited, and they may be poured from the lower floors up, or from the upper floors down.

[0068] In particular, in this embodiment, since new permanent members 22 are installed from the upper floors, it is possible to form (cast) the roof (rooftop) slab first. Forming the roof slab first in this way can protect the interior of the building from rain and other factors, which is effective in terms of waterproofing and also improves workability in rainy weather.

[0069] <<First Modification>> 6A to 6F and 7A to 7D are diagrams showing a first modified example of a method for remodeling an existing building 10. In this example, the existing building 10 is also remodeled from seven stories to four stories.

[0070] First, as shown in FIG. 6A, the left exterior wall 13 and the right exterior wall 14 of the existing building 10 are left, and the top two floors (beams 12 on the RFL and 7FL, and columns 11 on the 7th and 6th floors: existing upper structure 15) are demolished.

[0071] Next, as shown in Fig. 6B, an upper member 52 is installed. Here, a permanent member 22 is installed at the RFL position, and a reinforcing member 30 is installed underneath it for temporary reinforcement. In this way, a new upper structure 50 is constructed.

[0072] Next, as shown in Fig. 6C, the beams 12 on the 6th floor and the columns 11 on the 5th floor (the existing lower structural upper parts 16a) are dismantled, and as shown in Fig. 6D, lower members 62 are installed. Here, permanent members 22 are installed at the 6th floor position, and reinforcing members 30 are installed underneath them for temporary reinforcement.

[0073] Next, as shown in Fig. 6E, the beams 12 on the 5th floor and the columns 11 on the 4th floor are dismantled, thereby forming the new lower structure 60. Thereafter, dismantling and installation are repeated in the same manner up to the target floor.

[0074] Specifically, after FIG. 6E, as shown in FIG. 6F, the beams 12 on the 4th floor and the columns 11 on the 3rd floor are dismantled.

[0075] Next, as shown in FIG. 7A, permanent member 22 is installed at a position 4FL, and reinforcing member 30 is installed underneath for temporary reinforcement.

[0076] Next, as shown in Fig. 7B, the beams 12 on the third floor and the columns 11 on the second floor are dismantled, and earthquake-resistant elements (in this case, earthquake-resistant walls 40) are installed as shown in Fig. 7C. Then, as shown in Fig. 7D, the reinforcing members 30 are dismantled and removed. In the case of this first modified example, the amount of reinforcing members 30 can be reduced compared to the comparative example, and costs can be reduced.

[0077] <<Second Modification>> In the above-described embodiment, the earthquake-resistant elements (earthquake-resistant walls 40) were constructed after all of the permanent members 22 and reinforcing members 30 were installed, but in this second modified example, the earthquake-resistant elements are also constructed when the permanent members 22 and reinforcing members 30 are installed.

[0078] 8A to 8F and 9A to 9D are diagrams showing a second modified example of the method for remodeling the existing building 10. In this example, the existing building 10 is also remodeled from seven stories to four stories.

[0079] First, as shown in FIG. 8A, the left exterior wall 13 and the right exterior wall 14 of the existing building 10 are left, and the top two floors (beams 12 on the RFL and 7FL, and columns 11 on the 7th and 6th floors: existing upper structure 15) are demolished.

[0080] Next, as shown in Figure 8B, the upper members 52 are installed. Here, permanent members 22 are installed at the RRFL position, and temporary reinforcement members 30 and seismic elements (braces 42) are installed underneath. Temporary reinforcement members 30 and braces 42 are also installed on the sixth floor below. This completes the new upper structure 50. However, unless the braces 42 are connected all the way to the lowest floor of the existing building 10 (i.e., during demolition), their effectiveness is limited (similar to that of the temporary reinforcement members 30).

[0081] Next, as shown in Fig. 8C, the beams 12 on the 6th floor and the columns 11 on the 5th floor (existing lower structural upper parts 16a) are dismantled, and lower members 62 are installed. Here, permanent members 22 are installed on the 6th floor, and temporary reinforcing members 30 and braces 42 are installed below them.

[0082] Next, as shown in Fig. 8D, the beams 12 on the 5th floor and the columns 11 on the 4th floor (lower portions 16b of the existing lower structure) are dismantled, and as shown in Fig. 8E, temporary reinforcing members 30 and braces 42 are installed. In this way, the new lower structure 60 is constructed.

[0083] Next, as shown in FIG. 8F, the beams 12 on the 4th floor and the columns 11 on the 3rd floor are dismantled, and as shown in FIG. 9A, permanent members 22 are installed on the 4th floor, with temporary reinforcing members 30 and braces 42 installed underneath.

[0084] Next, as shown in FIG. 9B, the beams 12 on the third floor and the columns 11 on the second floor are dismantled, and as shown in FIG. 9C, braces 42 are installed and connected to the beam-column frame on the second floor of the existing building 10. This enables the braces 42, which are earthquake-resistant elements, to become effective. Then, as shown in FIG. 9D, all temporary reinforcing members 30 are dismantled and removed. In the case of this second modified example, the amount of reinforcing members 30 can be reduced compared to the comparative example, thereby achieving cost reduction.

[0085] ===Other embodiments=== The above-described embodiments are intended to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit thereof, and the present invention includes equivalents thereof.

[0086] In the above-described embodiment, the case where the existing building 10 is renovated (modified) from seven stories to four stories is described, but the number of floors before and after the modification is not limited to this. Also, for example, it is applicable to a case where the center column (column 11) is removed while the building remains seven stories tall.

[0087] Furthermore, in the above-described embodiment, the case where the earthquake-resistant wall 40 and the brace 42 are installed as earthquake-resistant elements is exemplified, but the earthquake-resistant elements also include the installation of, for example, a seismic isolation device or a seismic control device. [Explanation of symbols]

[0088] 10 Existing buildings 11 pillars 12 Beam 13 Left outer wall 14 Right outer wall 15 Existing upper structure 16 Existing lower structure 16a Upper part of existing lower structure 16b Lower part of existing lower structure 22 Permanent members 30 Reinforcement member 40 Earthquake-resistant wall 42 Brace 50 New upper structure 52 Upper member 60 New lower structure 62 Lower member

Claims

1. A method for remodeling an existing building comprising: an existing upper structure; an existing lower structure integrally connected to the lower side of the existing upper structure; an existing left outer structure integrally connected to the outer left side of the existing upper structure and the existing lower structure; and an existing right outer structure integrally connected to the outer right side of the existing upper structure and the existing lower structure, a new upper structure installation step of installing a new upper structure between the existing left outer structure and the existing right outer structure in the portion of the existing upper structure; a new lower structure installation step of installing a new lower structure between the existing left outer structure and the existing right outer structure in the portion of the existing lower structure after the new upper structure installation step; A method for remodeling an existing building, comprising:

2. 2. The method for remodeling an existing building according to claim 1, At least one of the new upper structure and the new lower structure includes a permanent member; A method for remodeling an existing building.

3. The method for remodeling an existing building according to claim 1 or 2, The new upper structure installation step includes: an existing upper structure dismantling step of dismantling the existing upper structure; an upper member installation step of installing an upper member above a space between the existing left outer structure and the existing right outer structure, the space being occupied by the existing upper structure, after the existing upper structure dismantling step; A method for remodeling an existing building, comprising:

4. The method for remodeling an existing building according to claim 1 or 2, The new upper structure installation step includes: an upper member installation step of installing an upper member between the existing left outer structure and the existing right outer structure; After the upper member installation step, an existing upper structure dismantling step of dismantling the existing upper structure below the upper member; A method for remodeling an existing building, comprising:

5. The method for remodeling an existing building according to claim 1 or 2, The new lower structure installation step includes: an existing lower structure dismantling step of dismantling the existing lower structure; a lower member installation step of installing a lower member in a space between the existing left outer structure and the existing right outer structure where the existing lower structure was installed after the existing lower structure dismantling step; A method for remodeling an existing building, comprising:

6. The method for remodeling an existing building according to claim 1 or 2, The new lower structure installation step includes: a lower member installation step of installing a lower member between the existing left outer structure and the existing right outer structure; an existing lower structure dismantling step of dismantling the existing lower structure after the lower member installation step; A method for remodeling an existing building, comprising:

7. 7. The method for remodeling an existing building according to claim 6, The existing lower structure includes an existing lower structure upper portion and an existing lower structure lower portion below the existing lower structure upper portion, The lower member installation step includes a disassembling step of the upper part of the existing lower structure, which dismantles the upper part of the existing lower structure, After the lower member installation step, there is provided an existing lower structure lower body disassembly step of dismantling the lower part of the existing lower structure. A method for remodeling an existing building.

8. 2. The method for remodeling an existing building according to claim 1, In the step of installing the new lower structure, when a part of the new lower structure suspended from above the new upper structure is inserted into a gap in the new upper structure and installed below the new upper structure, this is done while or after confirmation by simulation using three-dimensional data of the new upper structure and the new lower structure. A method for remodeling an existing building.

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