Method for reusing column and building

Abstract

To enable a column to be reused.SOLUTION: A method for reusing a column includes, in an existing building, a first cutting step of cutting one column above a floor level, and a column new-construction step of forming a new column by reusing a column base portion of the one column, which is below a cutting position in the first cutting step.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a method for reusing columns and a building.

Background Art

[0002] There is known an existing foundation reuse method that enables the mixed use of existing piles and newly installed piles.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, since the column is fixed to the foundation beam by an anchor bolt or the like, it is considered difficult to reuse. For example, when chipping the concrete to expose the anchor bolt, there is a high possibility of damaging the anchor bolt. If the anchor bolt is damaged, the reuse of the column becomes substantially impossible.

[0005] Therefore, an object of the present disclosure is to enable the reuse of columns.

Means for Solving the Problems

[0006] On one side, in an existing building, a first cutting step of cutting one column above the floor level, and a column new construction step of reusing a column base portion of the one column below the cutting position in the first cutting step to form a new column, are provided, and a method for reusing a column is provided.

Effects of the Invention

[0007] According to the present disclosure, the reuse of columns becomes possible.

Brief Description of the Drawings

[0008]

Figure 1

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Embodiments for Carrying Out the Invention

[0009] Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings. Note that the dimensional ratios in the drawings are merely examples and are not limited thereto, and the shapes and the like in the drawings may be exaggerated partially for the convenience of explanation. Also, in the drawings, for ease of viewing, only some of the portions having the same attribute that exist in plurality may be provided with reference numerals.

[0010] The method for reusing the columns of this embodiment is preferably realized together with the reuse of the foundation beams. Therefore, hereinafter, the method for reusing the columns of this embodiment will be described in relation to the reuse of the foundation beams. However, the method for reusing the columns of this embodiment may be realized without accompanying the reuse of the foundation beams.

[0011] FIG. 1 is a flowchart showing a schematic flow of the method for reusing columns and the like according to this embodiment. FIGS. 2 to 12 are explanatory diagrams of each step of the reuse method shown in FIG. 1, and are schematic diagrams schematically showing the execution method of the corresponding step and the state at the time of completion of the step. In the following description, "existing" means that it existed in the existing building 1.

[0012] The method for reusing the foundation beams of this embodiment (hereinafter also referred to as "this method") first includes a step (S20) of cutting out columns from the foundation beam 24. FIGS. 2 and 3 show explanatory diagrams of this step (S20). FIG. 2 schematically shows a side view of the existing building 1 including the cutting positions CT50 and CT51 in the columns 52 and 53. FIG. 3 is a side view schematically showing the cut portion of the column 52. In FIGS. 2 and 3 (and also in FIGS. 4 and the like to be described later), a right-handed coordinate system is associated with each figure, and the Z direction corresponds to the vertical direction.

[0013] In this example, columns 52 and 53 out of the three columns 51 to 53 are separated from the foundation beam 24. In the example shown in FIG. 2, three columns 51, 52, and 53 are connected to the foundation beam 24, and all of column 51, a part of column 52 (column base part 521 described later), and all of column 53 are reused in the new building 2 described later. In addition, when a column flange is provided on column 53, the column flange may be used at other locations in the new building 2. This is because column 53 is reused as a column that does not require an existing column flange as described later. Note that column 51 and the like may be reused together with the existing column flange.

[0014] In addition, in this embodiment, columns 51 to 53 typically correspond to steel members (for example, H-shaped steel) forming columns in a steel structure, but may also be columns in a reinforced concrete structure.

[0015] FIG. 3 schematically shows an enlarged view of the cut portion at the cutting position CT50. In FIG. 3, the cut portion at the cutting position CT50 is shown, but the cut portion at the cutting position CT51 may be the same. In FIG. 3, reference numeral 524 indicates the base mortar between the top end of the beam and the lower end of column 52.

[0016] Hereinafter, for convenience, the column main body parts 520 and 530 respectively refer to the upper parts taken out by cutting at the cutting positions CT50 and CT51 of columns 52 and 53. Also, the column base parts 521 and 531 respectively refer to the lower parts remaining on the foundation beam 24 side by cutting at the cutting positions CT50 and CT51 of columns 52 and 53.

[0017] In this embodiment, a cutting position CT50 is set above the floor level. That is, the cutting position CT50 is set above the lower part (column base part 521) of the column 52 that is covered by the concrete 240 of the foundation beam 24. Thereby, while substantially eliminating the possibility of damaging the anchor bolt 522 located below the floor level, the reuse of the column base part 521 (and / or the column main body part 520) becomes possible. That is, as a comparative example shown in FIG. 3A, when removing and reusing the nut 5221 of the anchor bolt 522, it is necessary to chisel out the concrete 240 to expose the anchor bolt 522 (in FIG. 3A, the boundary of the chiseling range is schematically shown by a line L30). In this case, there is a possibility of damaging the anchor bolt 522 of the column base part 521 during such chiseling work. If the anchor bolt 522 is damaged, the reuse of the column base part 521 becomes substantially impossible. On the other hand, according to this embodiment, since only the column main body part 520 of the column 52 above the foundation beam 24 is taken out, the column base part 521 (and / or the column main body part 520) can be reused while substantially eliminating the possibility of damaging the anchor bolt 522.

[0018] Next, this method includes a splitting step (S21) of cutting (splitting) the foundation beam 24 of the existing building 1.

[0019] FIGS. 4 and 5 show explanatory diagrams of this step (S21). FIG. 4 schematically shows a side view of the existing building 1 including the cutting positions (two places) CT10 and CT11 of the foundation beam 24. FIG. 5 is a side view schematically showing the cut portion of the foundation beam 24.

[0020] The cutting position is arbitrary as long as the portion of the foundation beam 24 separated by cutting can be reused in the new building 2, but preferably it is a position away from the positions where the columns (columns 51, 53A, 54A to be described later) of the new building 2 are installed. In the example shown in FIG. 4, the cutting positions CT10 and CT11 are preferably positions away from the respective column positions related to the existing columns 51 to 53. In this example, as an example, there are two cutting positions for the foundation beam 24, and these two positions consist of one between the column 51 and the column base 521 and one between the column base 521 and the column base 531. In FIG. 4, the foundation beam 24 is cut along the YZ plane at each of the cutting positions CT10 and CT11.

[0021] FIG. 5 schematically shows an enlarged view of the cut portion at the cutting position CT10. The foundation beam 24 may be cut within a cutting range having a predetermined width w10 centered on the cutting position CT10 (the range between the lines L31 and L32 in FIG. 5). In this case, the concrete within the cutting range having the predetermined width w10 is crushed and removed, but the reinforcing bars 15 are only cut and maintained. Therefore, from the side surfaces on the cutting position CT10 and CT11 sides, the reinforcing bars 15 protrude from the concrete. Note that the removed concrete may be used as crushed stone within the site of the new building 2.

[0022] Hereinafter, the portion of the foundation beam cut out from the foundation beam 24 in this way is also referred to as the split foundation beam 25. In the following description, as shown in FIG. 4, the case where it is separated into three split foundation beams 25 will be mainly described. Also, when distinguishing these split foundation beams 25, they are denoted as split foundation beams 251, 252, and 253. However, the number of splits from one foundation beam 24 is not limited to three, and may be two or four or more. Also, not all of the split foundation beams obtained by splitting one foundation beam 24 need to be used as foundation beams in the new building 2, and a part of them may be used for different purposes.

[0023] In this embodiment, the columns 52 and 53 are cut before splitting (cutting) the foundation beam 24, but the reverse may also be possible. That is, the columns 52 and 53 may be cut after splitting (cutting) the foundation beam 24.

[0024] Next, this method includes a step (S22) of installing the divided foundation beam 25 within the foundation beam formation range for the new building 2 and installing the column main body parts 530 and 540 on the divided foundation beam 25.

[0025] FIG. 6 schematically shows, in a side view, a state in which the divided foundation beam 25 is arranged within the foundation beam formation range for the new building 2. In this example, as an example, it is assumed that the length (length in the X direction) of the foundation beam formation range in the new building 2 is longer than the length of the original foundation beam 24. That is, the length (length in the X direction) of the foundation beam formation range in the new building 2 is significantly longer than the sum of the lengths of the three divided foundation beams 251 to 253. Therefore, in this case, as shown in FIG. 6, spaces S1 and S2 remain between the three divided foundation beams 251 to 253.

[0026] FIG. 7 schematically shows, in a side view, a state in which the column 53A for the new building 2 is installed. In this example, the column 51 has been installed at a portion corresponding to the divided foundation beam 251 in the foundation beam 24 since the existing building 1 and is reused as it is. However, various adjustment processes such as adjusting the height of the column 51 may be performed. The column 53A is formed by connecting the column main body part 530 and the column leg part 521. The column main body part 530 was installed as part of the column 53 at a portion corresponding to the divided foundation beam 253 in the foundation beam 24 in the existing building 1, but in the new building 2, it is installed (relocated) on the divided foundation beam 252. In this case, in the existing building 1, the beam 23 (see FIG. 2) arranged between the column 51 and the column 53 can also be easily reused in the new building 2 (see FIG. 7). That is, at the end of the beam 23, the upper part of the column 53 was also connected in the existing building 1 (see FIG. 2). Therefore, by connecting the column main body part 530 instead of the column main body part 520 of the column 52 to the same end of the beam 23, the connection between the beam 23 and the column main body part 530 can be facilitated. However, at this time, the beam 23 may be subjected to various adjustment processes such as adjusting the length.

[0027] In this embodiment, the column main body portion 530 is the upper portion cut out from the column 53 and is coupled to the upper part of the column base portion 521 of the column 52. FIGS. 8 and 8A respectively show different examples of the coupling method between the column main body portion 530 and the column base portion 521. The coupling method between the column main body portion 530 and the column base portion 521 is arbitrary. For example, as shown in FIG. 8, the column main body portion 530 and the column base portion 521 may be butted up and down and realized by welding (i.e., a welded joint). In this case, the welding may be applied to all four surfaces (flange surfaces and web surfaces) related to the four sides of the H-shaped cross-section of the H-shaped steel (FIG. 8 shows welding symbols for two surfaces). Also, as shown in FIG. 8A, the column main body portion 530 and the column base portion 521 may be butted up and down and realized by bolt joining using bolts BT8 and a fixing plate BK8. Note that the fixing plate BK8 may be provided across the column main body portion 530 and the column base portion 521 on all four surfaces (flange surfaces and web surfaces) related to the four sides of the H-shaped cross-section of the H-shaped steel. The welded joint is suitable, for example, when the column base portion 521 is like the column base portion to which a brace is attached and the fit is complicated. On the other hand, bolt joining is suitable when the fit is not complicated. Note that in a modified example, a combination of a welded joint and bolt joining may be used.

[0028] Note that the column main body portion 530 and the column base portion 521 desirably have the same cross-sectional shape (for example, the same H-shaped steel), but they may have different cross-sectional shapes.

[0029] In this way, according to this embodiment, the column base portion 521 can form a new column 53A while remaining coupled to the split foundation beam 252. Thereby, a new column 53A can be formed using the existing columns 52 and 53 without damaging the anchor bolts 522 as described above.

[0030] FIG. 9 schematically shows in a side view the state where the column 54A for the new building 2 is installed. In this example, the column main body portion 540 is cut out from the column 54 in the same manner as the column main body portion 530 from the column 53. That is, the column main body portion 540 is cut out from the column 54 that was installed on another foundation beam 24A (see FIG. 10) in the existing building 1. FIG. 10 schematically shows the relocation method. In the example shown in FIG. 10, the column main body portion 540, which is the portion above the cutting position CT53 of the column 54, is separated from the foundation beam 24A together with the beam 23A (see arrow R71). The column 55 may be similarly separated from the foundation beam 24A and may also be separated from the beam 23A. In the example shown in FIG. 10, the upper part of the column main body portion 540 is cut (see the cutting position CT20), and the inclination of the beam 23A is adjusted (see arrow R72). Note that such inclination adjustment depends on the design of the new building 2 and may be omitted as appropriate. In this example, the beam 23A is coupled to the upper part of the column main body portion 530 as shown in FIG. 9.

[0031] In this embodiment, the column main body portion 540 is relocated (utilized) to the split foundation beam 253. At this time, the column main body portion 540 is coupled to the upper part of the column leg portion 531. This coupling method may be as described above with reference to FIGS. 8 and 8A. Thereby, a new column 54A can be formed using the existing columns 53 and 54 without damaging the anchor bolts (see the anchor bolt 522) as described above.

[0032] Next, this method includes a foundation beam new construction step (S23) of integrating the split foundation beam 25 and the new foundation beam element to form one new foundation beam.

[0033] FIGS. 11 and 12 show explanatory diagrams of the foundation beam new construction step (S23). FIG. 11 is a side view schematically showing the coupling mode between the reinforcing bars, and FIG. 12 is a side view schematically showing the state after the completion of the foundation beam new construction step.

[0034] The new foundation beam construction (S23) includes a step of installing an element for the new foundation beam 24B (hereinafter also referred to as the "newly installed foundation beam element 240B") between the divided foundation beams 251 to 253. Spaces S1 and S2 are formed between the divided foundation beams 251 to 253 as described above. In this case, the spaces S1 and S2 become the regions for forming the newly installed foundation beam element 240B.

[0035] This step (S23) first includes a step of arranging the steel bars 15A for the new foundation beam element in the spaces S1 and S2. In this case, the steel bars 15A for the new foundation beam element are joined to the steel bars 15 at the ends in the divided foundation beam 25 by welding as shown in FIG. 11. In this case, enclosed welding may be used.

[0036] Next, this step (S23) includes placing concrete in the spaces S1 and S2. As a result, as shown in FIG. 12, the divided foundation beams 251 to 253 and the newly installed foundation beam element 240B are integrated to form a new foundation beam 24B. That is, the foundation beam element 240B is complemented in the spaces S1 and S2 as the new foundation beam 24B.

[0037] Thus, according to this embodiment, the foundation beam 24 of the existing building 1 can be used to form the foundation beam 24B for the new building 2. That is, the foundation beam 24 of the existing building 1 can be reused.

[0038] Further, according to this embodiment, since the newly installed foundation beam element 240B is formed between the divided foundation beams 251 to 253, the reuse of the columns (such as columns 51 and 53) of the existing building 1 can be efficiently realized. For example, since the column 51 is reused in a state of being joined to the divided foundation beam 251, separation and relocation are not required, and efficient reuse is possible.

[0039] Further, according to the present embodiment, as described above, the cutting positions CT10 and CT11 related to the divided foundation beams 251 to 253 are positions (intermediate positions) between the columns of the existing building 1. Thus, when reusing the columns (such as columns 51 and 53) of the existing building 1, a new foundation beam element 240B can be formed between the columns 51, 53A, and 54A of the new building 2. In this case, the connection position between the new foundation beam element 240B and the divided foundation beams 251 to 253 can be set at a position relatively far from the columns 51, 53A, and 54A of the new building 2. As a result, the strength required in the vicinity of the columns 51, 53A, and 54A of the new building 2 in the foundation beam 24B is ensured, and the reliability of the foundation beam 24B can be enhanced.

[0040] As described above, each embodiment has been described in detail, but the present invention is not limited to specific embodiments, and various modifications and changes are possible within the scope described in the claims. Also, it is possible to combine all or a plurality of the constituent elements of the above-described embodiments.

[0041] For example, in the above-described embodiment, the columns installed on the divided foundation beams 251 to 253 are columns of the existing building 1, but the present invention is not limited thereto. For example, a part of the columns installed on the divided foundation beams 251 to 253 may be newly provided.

[0042] Also, in the above-described embodiment, a new foundation beam element 240B is formed between the divided foundation beams 251 to 253, but the present invention is not limited thereto. For example, a new foundation beam element 240B may be formed on the opposite side of the divided foundation beam 251 (the side opposite to the side of the divided foundation beam 252).

[0043] Also, in the above-described embodiment, the column base portions 521 and 531 reused together with a part (the divided foundation beams 252 and 253) of the foundation beam 24 are joined with the column main body portions 530 and 540, which are parts of the columns 53 and 54 of the existing building 1, but the present invention is not limited thereto. For example, a newly provided column main body portion may be joined to the column base portions 521 and 531.

[0044] Furthermore, in relation to the above embodiment, the following supplementary note is disclosed.

[0045] [Appendix 1] In an existing building, a first cutting step of cutting a column above the floor level, and a column addition step of integrating a column portion above the cutting position in the first cutting step of the one column with a column base portion related to another column to form a new column, a method for reusing a column.

[0046] [Appendix 2] The existing building further includes a second cutting step of cutting the other column above the floor level, wherein the column base portion corresponds to a portion below the cutting position in the second cutting step of the other column, the method for reusing a column according to Appendix 1.

[0047] [Appendix 3] The other column is fixed to a foundation beam by an anchor bolt, wherein the column addition step includes forming the new column while maintaining the connection state between the anchor bolt and the foundation beam, the method for reusing a column according to Appendix 1.

[0048] [Appendix 4] The column addition step includes connecting the column portion to the column base portion by welding or bolts, the method for reusing a column according to Appendix 1. [Appendix 5] Having a specific column formed by reusing a column of an existing building, wherein the specific column is formed by using a column main body portion taken out above the cutting position by cutting above the floor level of one column of the existing building, a building.

Explanation of Signs

[0049] 1 Existing building 2 New building 15, 15A Reinforcing bar 23, 23A Beam 24, 24A, 24B Foundation beam 240B Foundation beam element 25 Split foundation beam 251 - 253 Divided Foundation Beam Columns of 51 - 54 (Existing Building) Columns of 51, 53A, 54A (New Building) Column Body Parts of 530, 540 Column Foot Parts of 521, 531 Anchor Bolt of 522

Claims

1. In an existing building, a first cutting step of cutting one column above the floor level, and a column construction step of reusing the column base part of the one column below the cutting position in the first cutting step to form a new column, a method for reusing a column.

2. The existing building further includes a second cutting step of cutting another one column above the floor level, and the column construction step includes forming the new column by integrating the column main body part of the another one column above the cutting position in the second cutting step with the column base part, the method for reusing a column according to Claim 1.

3. The column base part of the one column is fixed to the foundation beam by anchor bolts, and the column construction step includes forming the new column while maintaining the connection state between the anchor bolts and the foundation beam, the method for reusing a column according to Claim 1 or 2.

4. The column construction step includes connecting the column part to the column base part by welding or bolts, the method for reusing a column according to Claim 1 or 2.

5. Having a specific column formed by reusing a column of an existing building, and the specific column is a building formed by reusing the column base part remaining below the cutting position after cutting above the floor level of one column of the existing building.

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