A method and device for repairing local casing of damaged steel tube concrete column

Abstract

The present application relates to a local casing repair method and device for a damaged steel tube concrete column, which belongs to the field of building structures and includes the following steps: S1, welding and fixing the first fixing plate and the second fixing plate to the outer wall of the upper steel tube, and then welding the first mounting plate and the second mounting plate to the upper and lower ends of the outer steel plate respectively; S2, installing the outer casing; S3, inserting the bottom of the fixing rod into the socket on the third fixing plate, and then threading the first locking nut to the adjusting rod; S4, then installing the tightening assembly; S5, then threading the second locking nut to the adjusting rod, and covering the second locking nut with a cap; S6, then grouting the grouting hole until the slurry flows out of the slurry outlet hole; S7, after the concrete hardens, dismantling the adjusting rod and the fixing rod, dismantling the top plate and the protective cover, and dismantling the tightening plate to complete the dismantling. The present application has the effect of improving the stability of the steel tube concrete column during repair.

Description

Technical Field

[0001] The present application relates to the field of building structures, and in particular to a method and device for repairing a damaged steel tube concrete column with a local casing. Background Art

[0002] After a certain number of years of use, steel tube concrete columns often experience a reduction in structural performance due to construction quality defects, concrete breakage, and steel tube corrosion, making them unable to meet usage requirements and requiring repair. Furthermore, steel tube concrete columns may be damaged due to changes in usage requirements, earthquakes, impacts, etc., and the original steel tube concrete columns also need to be repaired.

[0003] Currently, the most common repair and reinforcement method is replacement reinforcement, which involves removing broken and buckled steel pipes, welding new steel plates to connect the undamaged pipes, and replacing the damaged concrete inside. With this traditional replacement reinforcement method, the steel plates in the replaced areas are unable to share the load during normal use. The load during normal use is borne entirely by the unreplaced concrete, resulting in high stress levels in this area, making it prone to premature failure during earthquakes, affecting the structure's bearing capacity. Summary of the Invention

[0004] In order to improve the stability of steel tube concrete columns during repair, the present application provides a local casing repair method and device for damaged steel tube concrete columns.

[0005] On the one hand, the present application provides a method for repairing a damaged concrete-filled steel tube column with a local casing, which adopts the following technical solution:

[0006] A method for repairing a damaged concrete-filled steel tube column with a local casing comprises the following steps:

[0007] S1. Divide the damaged concrete-filled steel tube column from top to bottom into three parts: the upper steel tube, the damaged area, and the lower steel tube. Weld the first and second fixing plates to the outer wall of the upper steel tube. Then, weld the first and second mounting plates to the upper and lower ends of the outer steel plate, respectively.

[0008] S2. Install the outer casing by inserting the first mounting plate on the outer steel plate between the first fixing plate and the second fixing plate and welding them in place. Weld the second mounting plate to the outer wall of the lower steel pipe and weld the adjacent outer steel plates together.

[0009] S3. Weld the third fixing plate to the outer wall of the lower steel pipe, insert the bottom of the fixing rod into the socket on the third fixing plate, thread the adjusting rod into the fixing rod, and then thread the first locking nut into the adjusting rod;

[0010] S4. Then, install the tightening assembly, place the second connecting plate above the first fixing plate, and pass the adjusting rod through the second connecting plate. After the three tightening plates are installed, tighten and secure the two adjacent first connecting plates with the first bolt and the first nut.

[0011] S5. Then, thread the second locking nut into contact with the adjusting rod so that the second locking nut is pressed against the upper surface of the second connecting plate, and cover the second locking nut with a cap.

[0012] S6, then inject grout into the grouting hole until the slurry flows out from the slurry outlet hole;

[0013] S7. After the concrete hardens, remove the cap and the second locking nut, disassemble the adjusting rod and the fixing rod, then unscrew the second nut, disassemble the top plate and the protective cover, and finally unscrew the first nut, disassemble the tightening plate, and complete the disassembly.

[0014] By adopting the above technical solution, when repairing the damaged area, the first mounting plate on the outer steel plate is inserted between the first fixing plate and the second fixing plate, and the second fixing plate is supported below the outer steel plate, thereby facilitating welding of the first mounting plate and the second mounting plate. The two adjacent tightening plates are fixed by the first bolt and the first nut, so that the tightening plate tightens the outer wall of the upper steel pipe, and the adjusting rod is fixed to the second connecting plate by the first locking nut and the second locking nut, so that the adjusting assembly provides a lifting force to the tightening plate, thereby generating friction between the tightening plate and the upper steel pipe, further providing a lifting force to the upper steel pipe and the upper undamaged area, reducing the stress level of the unreplaced concrete in the damaged area, and making the steel tube concrete column more stable during repair.

[0015] Optionally, in step S3, the first locking nut is screwed so that the upper surface of the first locking nut is flush with the upper surface of the first fixing plate.

[0016] By adopting the above technical solution, the upper surface of the first locking nut is flush with the upper surface of the first fixing plate, and the first locking nut and the first fixing plate jointly support the second connecting plate, thereby facilitating the support of the tightening plate and the second connecting plate, thereby facilitating the installation of the tightening plate.

[0017] Optionally, the top plate is installed by inserting the two plug-in columns on the top plate into the plug-in holes on the two adjacent tightening plates, and the two connecting rods at the bottom of the second protective plate pass through the two adjacent second connecting plates respectively. The bottom of the connecting rod is threadedly connected to a second nut, and the second nut is located below the second connecting plate and pressed against the second connecting plate.

[0018] By adopting the above technical solution, when the top plate is installed, the protective cover covers the first bolt and the first nut inside, and the two connecting rods respectively pass through the two adjacent second connecting plates and are threadedly connected to the second nuts, thereby increasing the stability of the connection between the two adjacent second connecting plates, thereby increasing the stability of the connection between the two adjacent tightening plates.

[0019] On the other hand, the present application also provides a local casing repair device for a damaged steel tube concrete column, comprising a tightening assembly, an outer casing, and an adjustment assembly. The reinforced concrete column comprises an upper steel tube, a damaged area, and a lower steel tube. A first fixing plate and a second fixing plate are fixed to the outer wall of the upper steel tube, and the first fixing plate is located above the second fixing plate.

[0020] The outer casing includes a plurality of arc-shaped outer steel plates, which are welded and fixed in sequence. The outer casing wraps the damaged area. A first mounting plate is fixed on the top of the outer steel plate, and a second mounting plate is fixed on the bottom of the outer steel plate. The first mounting plate is inserted between the first fixing plate and the second fixing plate and is welded and fixed. The second mounting plate is welded and fixed to the outer wall of the lower steel pipe. Grouting holes and slurry outlet holes are opened on the outer steel plate.

[0021] The tightening assembly includes three tightening plates, which tighten the outer wall of the upper steel pipe around a circle. A first connecting plate is fixed to both ends of each tightening plate in the vertical direction. Two adjacent first connecting plates are fixed by a first bolt and a first nut. A second connecting plate is fixed to the bottom of each tightening plate.

[0022] The adjusting assembly includes multiple fixing rods and adjusting rods. A third fixing plate is fixed on the outer wall of the lower steel pipe. A socket is provided on the third fixing plate. The bottom of the fixing rod is inserted into the socket. The adjusting rod is located above the fixing rod and is threadedly connected to the fixing rod. The top of the adjusting rod passes through the second connecting plate. A first locking nut and a second locking nut are threadedly connected to the adjusting rod. The first locking nut is located above the second connecting plate, and the second locking nut is located below the second connecting plate.

[0023] By adopting the above technical solution, when repairing the damaged area of ​​the steel tube concrete column, the outer casing is first welded, and then the tightening assembly and the adjustment assembly are installed. The adjustment assembly provides a lifting force to the tightening plate, thereby generating friction between the tightening plate and the upper steel tube, and further providing a lifting force to the upper steel tube and the upper undamaged area, reducing the stress level of the unreplaced concrete in the damaged area, thereby making the steel tube concrete column more stable during repair.

[0024] Optionally, a top plate is provided on the top of two adjacent tightening plates, two plug-in columns are fixed on the bottom of the top plate, and plug-in holes are provided on the tightening plates, one of the plug-in columns is inserted into the plug-in hole of one of the tightening plates, and the other plug-in column is inserted into the plug-in hole of the other tightening plate.

[0025] By adopting the above technical solution, the two plug-in columns on the top plate are respectively inserted into the plug-in holes on the two adjacent tightening plates, thereby making the connection of the tightening plates more stable.

[0026] Optionally, a protective cover is fixed to the bottom of the top to prevent the first bolt and the first nut from being corroded by rainwater.

[0027] By adopting the above technical solution, the protective cover can reduce the possibility of the first bolt and the first nut on the first connecting plate being corroded by rainwater.

[0028] Optionally, two connecting rods are connected to the bottom of the protective cover, one of the connecting rods passes through one of the second connecting plates, and the other connecting rod passes through the other second connecting rod, and the connecting rod is threadedly connected to a second nut after passing through the second connecting plate.

[0029] By adopting the above technical solution, the two connecting rods respectively pass through the two adjacent second connecting plates and are threadedly connected to the second nuts, thereby fixing the protective cover and the top plate, and also connecting the two adjacent second connecting plates, thereby improving the stability of the connection between the two adjacent tightening plates.

[0030] Optionally, a cap is provided above the second locking nut, and the cap is threadedly connected to the connecting rod.

[0031] By adopting the above technical solution, the cover cap protects the second locking nut, reducing the possibility of the second locking nut being eroded by rainwater, and facilitating the disassembly of the second locking nut.

[0032] Optionally, the bottom of the tightening plate contacts the top of the first fixing plate, and the upper surface of the first locking bolt is flush with the upper surface of the first fixing plate.

[0033] By adopting the above technical solution, the upper surface of the first locking nut is flush with the upper surface of the first fixing plate. When installing the tightening plate, the second connecting plate at the bottom of the tightening plate is placed on the first locking nut and the first fixing plate, thereby facilitating the installation of the tightening plate.

[0034] In summary, this application includes at least one of the following beneficial technical effects:

[0035] 1. The adjusting rod is fixed to the second connecting plate via the first and second locking nuts, allowing the adjusting assembly to provide lifting force to the tightening plate, thereby generating friction between the tightening plate and the upper steel pipe. This further provides lifting force to the upper steel pipe and the undamaged area above, reducing the stress level of the unreplaced concrete in the damaged area, thereby making the CFST column more stable during repair.

[0036] 2. When installing the top plate, the protective cover covers the first bolt and the first nut inside, and the two connecting rods respectively pass through the two adjacent second connecting plates and are threadedly connected to the second nuts, thereby increasing the stability of the connection between the two adjacent second connecting plates, thereby increasing the stability of the connection between the two adjacent tightening plates. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of this application.

[0038] Figure 2 It is a schematic diagram embodying the first fixing plate and the second fixing plate in this application.

[0039] Figure 3 It is a schematic diagram of the outer steel plate in this application.

[0040] Figure 4 It is a schematic diagram embodying the first connecting plate, the first bolt and the first nut in this application.

[0041] Figure 5 It is a schematic diagram of the top plate and protective cover in this application.

[0042] Figure 6 It is a schematic diagram embodying the connecting rod and the second nut in this application.

[0043] Figure 7 It is a schematic diagram of the adjustment component in this application.

[0044] Explanation of Reference Numerals: 1. Outer casing; 11. Outer steel plate; 111. First mounting plate; 112. Second mounting plate; 113. Grouting hole; 114. Grouting hole; 2. Upper steel pipe; 21. First fixing plate; 22. Second fixing plate; 3. Lower steel pipe; 31. Third fixing plate; 311. Insertion hole; 4. Damaged area; 5. Clamping assembly; 51. Clamping plate; 511. First connecting plate; 512. First bolt; 513. First nut; 514. Plug-in hole; 515. Second connecting plate; 6. Top plate; 61. Plug-in column; 62. Protective cover; 621. First protective plate; 622. Second protective plate; 623. Third protective plate; 63. Connecting rod; 64. Second nut; 7. Adjustment assembly; 71. Fixing rod; 72. Adjustment rod; 711. Adjustment handle; 73. First locking nut; 74. Second locking nut; 75. Cap. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1 -Attached Figure 7 This application is described in further detail.

[0046] The embodiment of the present application discloses a local casing repair device for a damaged steel tube concrete column. Figure 1 、 Figure 2 and Figure 3 The repair device includes an outer casing 1, the steel tube concrete column includes an upper steel pipe 2 and a lower steel pipe 3, the position between the upper steel pipe 2 and the lower steel pipe 3 is the damaged area 4, and the outer casing 1 and the damaged area 4 form a casting space.

[0047] The inner diameter of the outer casing 1 is larger than the diameter of the steel tube concrete column. The outer casing 1 includes three outer steel plates 11. The outer steel plates 11 are arc-shaped. The three outer steel plates 11 surround the outer casing 1. The adjacent two outer steel plates 11 are fixed by welding. The outer steel plates 11 are a closed structure along the annular direction.

[0048] A first mounting plate 111 is fixed to the top of the outer steel plate 11, and a second mounting plate 112 is fixed to the bottom of the outer steel plate 11. A first fixing plate 21 and a second fixing plate 22 are welded to the outer wall of the upper steel tube 2. Both the first fixing plate 21 and the second fixing plate 22 are circular plates, with the second fixing plate 22 located below the first fixing plate 21. The gap between the first and second fixing plates 21 and 22 is the same thickness as the first mounting plate 111.

[0049] The first mounting plate 111 is inserted between the first fixing plate 21 and the second fixing plate 22, and the first mounting plate 111 is welded to the first fixing plate 21 and the second fixing plate 22. A second mounting plate 112 is fixed to the bottom of the outer steel plate 11, and the second mounting plate 112 is welded to the outer wall of the lower steel pipe (3). A grouting hole 113 and a grouting hole 114 are opened on the side of the outer steel plate 11 close to the first mounting plate 111.

[0050] A tightening assembly 5 is provided above the first fixing plate 21 to tighten the outer wall of the upper steel pipe 2. The tightening assembly 5 includes three tightening plates 51, each of which is an arc-shaped plate. The three tightening plates 51 surround the upper steel pipe 2, and the inner walls of the tightening plates 51 are in contact with the outer wall of the upper steel pipe 2.

[0051] A first connecting plate 511 is fixed to both sides of the outer wall of each clamping plate 51 in the vertical direction. Each first connecting plate 511 is provided with a plurality of first bolts 512 and first nuts 513. The first bolts 512 penetrate the two contacting first connecting plates 511 and are threadedly connected to the first nuts 513. The two contacting first connecting plates 511 are fixed together by the first bolts 512 and first nuts 513, thereby enabling the three clamping plates 51 to clamp the outer wall of the upper steel pipe 2.

[0052] Reference Figure 5 and Figure 6 A second connecting plate 515 is fixed to the bottom of each reinforcing plate 51. A top plate 6 is provided on top of two adjacent reinforcing plates 51. A plug hole 514 is provided on the top of each reinforcing plate 51. Two plug posts 61 are fixed to the side of the top plate 6 near the reinforcing plates 51. One plug post 61 plugs into the plug hole 514 on one reinforcing plate 51, and the other plug post 61 plugs into the plug hole 514 on the other reinforcing plate 51. The plug posts 61 on the top plate 6 are inserted into the plug holes 514, thereby increasing the stability between the two adjacent reinforcing plates 51.

[0053] A protective cover 62 is provided below the reinforcing plate 51, and the protective cover 62 includes a first protective plate 621, a second protective plate 622 and a third protective plate 623. The tops of the first protective plate 621, the second protective plate 622 and the third protective plate 623 are all fixed to the bottom of the reinforcing plate 51. The first protective plate 621, the second protective plate 622 and the third protective plate 623 are connected and fixed in sequence to form a U-shaped protective cover 62. The opening of the U-shaped protective cover 62 faces the reinforcing plate 51. The protective cover 62 covers the two adjacent first connecting plates 511, the first bolt 512 and the first nut 513 inside, reducing the possibility of the first bolt 512 and the first nut 513 being corroded by rainwater.

[0054] Two connecting rods 63 are fixed to the bottom of the second protective plate 622. These connecting rods 63 extend through two adjacent second connecting plates 515, and are then threadedly connected to second nuts 64. The arrangement of these connecting rods 63 and second nuts 64 secures the second protective plate 622 to the top plate 6, thereby increasing the stability of the top plate 6. The two connecting rods 63 extend through two adjacent second connecting plates 515, increasing the stability of the connection between the two adjacent second connecting plates 515 and, consequently, the connection between the two adjacent tightening plates 51.

[0055] Reference Figure 7A third fixing plate 31 is fixed to the outer wall of the lower steel pipe 3. An adjustment assembly 7 is provided on the third fixing plate 31. The adjustment assembly 7 includes a plurality of fixing rods 71. The fixing rods 71 ​​are hexagonal prisms. A socket 311 is provided at the bottom of the third fixing plate 31. The bottoms of the fixing rods 71 ​​are inserted into the socket 311. An adjustment rod 72 is provided above the fixing rod 71. The adjustment rod 72 is a threaded rod. The bottom of the adjustment rod 72 is inserted into the interior of the fixing rod 71 and is threadedly connected to the fixing rod 71. An adjustment handle 711 is fixed to the adjustment rod 72. Turning the adjustment handle 711 can adjust the length of the adjustment rod 72 extending from the fixing rod 71.

[0056] The tops of the adjustment rods 72 extend through the second connecting plate 515. A first locking nut 73 and a second locking nut 74 are threadedly connected to each adjustment rod 72. The first locking nut 73 is located below the second locking nut, and the upper surface of the first locking nut 73 is flush with the upper surface of the first fixing plate 21. The second locking nut 74 is located above and below the second connecting plate 515. The adjustment assembly 7 exerts a lifting force on the clamping plate 51 and the upper steel pipe 2, enabling the height adjustment assembly 7 to withstand the loads during normal use.

[0057] A cap 75 is provided on the top of each adjusting rod 72. A locking nut located above the cap 75 is located in the cap 75. The cap 75 is threadedly connected to the top of the adjusting rod 72. The cap 75 can reduce the possibility of the nut being damaged by rainwater.

[0058] The present application also discloses a method for repairing a damaged concrete-filled steel tube column by local casing, comprising the following steps:

[0059] S1. Weld the first fixing plate 21 and the second fixing plate 22 to the outer wall of the upper steel pipe 2, and then weld the first mounting plate 111 and the second mounting plate 112 to the upper and lower ends of the outer steel plate 11 respectively;

[0060] S2. Install the outer casing 1 by inserting the first mounting plate 111 on the outer steel plate 11 into the first fixing plate 21 and the second fixing plate 22 and welding them to fix them. Weld the second mounting plate 112 to the outer wall of the lower steel pipe 3;

[0061] S3. Weld the third fixing plate 31 to the outer wall of the lower steel pipe 3, insert the bottom of the fixing rod 71 into the insertion hole 311 on the third fixing plate 31, thread the adjusting rod 72 into the fixing rod 71, then thread the first locking nut 73 into the adjusting rod 72, and align the upper surface of the first locking nut 73 with the upper surface of the first fixing plate 21.

[0062] S4. Then, install the tightening assembly 5. Place the second connecting plate 515 above the first fixing plate 21 and pass the adjusting rod 72 through the second connecting plate 515. After the three tightening plates 51 are installed, fasten and secure the two adjacent first connecting plates 511 with the first bolt 512 and the first nut 513.

[0063] S5. Install the top plate 6 by inserting the two plug posts 61 on the top plate 6 into the plug holes 514 on the two adjacent tightening plates 51, and pass the two connecting rods 63 at the bottom of the second protective plate 622 through the two adjacent second connecting plates 515. The bottom of the connecting rods 63 is threadedly connected to the second nut 64, which is located below the second connecting plate 515 and presses against the second connecting plate 515.

[0064] S6. Then, thread the second locking nut 74 into engagement with the adjusting rod 72 so that the second locking nut 74 is pressed against the upper surface of the second connecting plate 515 , and cover the second locking nut 74 with the cap 75 .

[0065] S7, then inject grout into the grouting hole 113 until the slurry flows out from the slurry outlet hole 114;

[0066] S8. After the concrete hardens, remove the cap 75 and the second locking nut 74, disassemble the adjusting rod 72 and the fixing rod 71, then unscrew the second nut 64, disassemble the top plate 6 and the protective cover 62, and finally unscrew the first nut 513, disassemble the tightening plate 51, and complete the disassembly.

[0067] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A method for repairing a damaged concrete-filled steel tube column with a local casing, characterized in that: The steps include: S1. Divide the damaged steel tube concrete column from top to bottom into three parts: the upper steel tube (2), the damaged area (4), and the lower steel tube (3); weld and fix the first fixing plate (21) and the second fixing plate (22) to the outer wall of the upper steel tube (2); and then weld the first mounting plate (111) and the second mounting plate (112) to the upper and lower ends of the outer steel plate (11); S2, installing the outer casing (1), inserting the first mounting plate (111) on the outer steel plate (11) between the first fixing plate (21) and the second fixing plate (22) and welding them to fix, welding the second mounting plate (112) to the outer wall of the lower steel pipe (3), and welding the adjacent outer steel plates (11); S3. Weld the third fixing plate (31) to the outer wall of the lower steel pipe (3), insert the bottom of the fixing rod (71) into the socket (311) on the third fixing plate (31), thread the adjusting rod (72) to the fixing rod (71), then thread the first locking nut (73) to the adjusting rod (72), and screw the first locking nut (73) so that the upper surface of the first locking nut is flush with the upper surface of the first fixing plate (21); S4. Then, the tightening assembly (5) is installed, the second connecting plate (515) is placed above the first fixing plate (21), and the adjusting rod (72) is passed through the second connecting plate (515). After the three tightening plates (51) are installed, the two adjacent first connecting plates (511) are locked and fixed by the first bolt (512) and the first nut (513). The top plate (6) is installed, and the two plug-in columns (61) on the top plate (6) are respectively inserted into the plug-in holes (514) on the two adjacent tightening plates (51), and the two connecting rods (63) at the bottom of the second protective plate (622) are respectively passed through the two adjacent second connecting plates (515). The bottom of the connecting rod (63) is threadedly connected with the second nut (64). The second nut (64) is located below the second connecting plate (515) and presses against the second connecting plate (515). S5. Then, the second locking nut (74) is threadedly connected to the adjusting rod (72), so that the second locking nut (74) is pressed against the upper surface of the second connecting plate (515), and the cover cap (75) is covered on the second locking nut (74); S6, then injecting grout into the grouting hole (113) until the slurry flows out from the slurry outlet hole (114); S7. After the concrete hardens, remove the cap (75) and the second locking nut (74), disassemble the adjusting rod (72) and the fixing rod (71), then unscrew the second nut (64), disassemble the top plate (6) and the protective cover (62), and finally unscrew the first nut (513), disassemble the tightening plate (51), and complete the disassembly.

2. A local casing repair device for damaged concrete-filled steel tube columns, characterized in that: A local casing repair method for a damaged steel tube concrete column according to claim 1, comprising a tightening assembly (5), an outer casing (1) and an adjustment assembly (7), wherein the reinforced concrete column comprises an upper steel tube (2), a damaged area (4) and a lower steel tube (3), a first fixing plate (21) and a second fixing plate (22) being fixed on the outer wall of the upper steel tube (2), and the first fixing plate (21) is located above the second fixing plate (22); The outer casing (1) comprises a plurality of arc-shaped outer steel plates (11), the plurality of arc-shaped outer steel plates (11) are welded and fixed in sequence, the outer casing (1) wraps the damaged area (4), a first mounting plate (111) is fixed to the top of the outer steel plate (11), a second mounting plate (112) is fixed to the bottom of the outer steel plate (11), the first mounting plate (111) is inserted between the first fixing plate (21) and the second fixing plate (22) and fixed by welding, the second mounting plate (112) is welded and fixed to the outer wall of the lower steel pipe (3), and a grouting hole (113) and a grouting hole (114) are opened on the outer steel plate (11); The tightening assembly (5) includes three tightening plates (51), and the three tightening plates (51) tighten the outer wall of the upper steel pipe (2) around a circle, and a first connecting plate (511) is fixed at both ends of each tightening plate (51) in the vertical direction, and two adjacent first connecting plates (511) are fixed by a first bolt (512) and a first nut (513), and a second connecting plate (515) is fixed at the bottom of each tightening plate (51); The adjustment assembly (7) includes a plurality of fixing rods (71) and an adjustment rod (72). A third fixing plate (31) is fixed on the outer wall of the lower steel pipe (3). The third fixing plate (31) is provided with a socket (311). The bottom of the fixing rod (71) is inserted into the socket (311). The adjustment rod (72) is located above the fixing rod (71) and is threadedly connected to the fixing rod (71). The top of the adjustment rod (72) passes through the second connecting plate (515). A first locking nut (73) and a second locking nut (74) are threadedly connected to the adjustment rod (72). The first locking nut (73) is located above the second connecting plate (515), and the second locking nut (74) is located below the second connecting plate (515).

3. A local casing repair device for a damaged concrete-filled steel tube column according to claim 2, characterized in that: A top plate (6) is provided on the top of two adjacent tightening plates (51), two plug-in posts (61) are fixed on the bottom of the top plate (6), and plug-in holes (514) are provided on the tightening plates (51), one of the plug-in posts (61) is inserted into the plug-in hole (514) of one of the tightening plates (51), and the other plug-in post (61) is inserted into the plug-in hole (514) of the other tightening plate (51).

4. A local casing repair device for a damaged concrete-filled steel tube column according to claim 3, characterized in that: A protective cover (62) is fixed to the bottom of the top portion to prevent the first bolt (512) and the first nut (513) from being eroded by rainwater.

5. The local casing repair device for a damaged concrete-filled steel tube column according to claim 4 is characterized in that: Two connecting rods (63) are connected to the bottom of the protective cover (62), wherein one of the connecting rods (63) passes through one of the second connecting plates (515), and the other connecting rod (63) passes through the other second connecting plate (515), and the connecting rod (63) passes through the second connecting plate (515) and is then threadedly connected to a second nut (64).

6. A local casing repair device for a damaged concrete-filled steel tube column according to any one of claims 2 to 5, characterized in that: A cap (75) is provided above the adjusting rod (72), and the cap (75) is threadedly connected to the adjusting rod (72).

7. The local casing repair device for a damaged concrete-filled steel tube column according to claim 2, characterized in that: The bottom of the tightening plate (51) contacts the top of the first fixing plate (21), and the upper surface of the first locking nut (73) is flush with the upper surface of the first fixing plate (21).

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