CFST pier column coated with CFRP cloth and internally filled with UHPC for reinforcement

Abstract

The utility model belongs to the technical field of CFST pier column reinforcement, and particularly relates to a CFST pier column wrapped with CFRP cloth and filled with UHPC for reinforcement, the CFST pier column comprises a plurality of round head studs fixedly connected to the outer side of the CFST pier column, a layer of carbon fiber grid and a UHPC reinforcing layer, the CFST pier column comprises a concrete column, and the outer side of the concrete column is fixedly connected with a steel pipe; the round-head studs are welded to the outer side of the steel pipe, the carbon fiber grid is fixed to the outer side of the steel pipe, the round-head studs penetrate through the carbon fiber grid, the UHPC reinforcing layer is fixedly connected to the outer side of the carbon fiber grid and the outer sides of the round-head studs, and the outer side of the UHPC reinforcing layer is fixedly connected with carbon fiber cloth. The ductility of the reinforced column is well improved through high-ductility materials such as the carbon fiber grid and the carbon fiber cloth, the UHPC reinforcing layer enables the structure to be light in weight, high in strength, durable, resistant to corrosion and convenient to construct, compared with an existing reinforcing method, the increased size and self weight of the CFST pier column can be reduced when the CFST pier column is reinforced, and the construction efficiency is improved. And the ductility of the structure can be well improved.

Description

Technical Field

[0001] This utility model belongs to the field of CFST pier reinforcement technology, specifically relating to a method of reinforcing CFST piers with an outer CFRP cloth and an inner UHPC grout. Background Technology

[0002] As buildings age, whether the damage is due to insufficient load-bearing capacity caused by improper design, poor building quality caused by supervision issues during construction, or damage caused by natural disasters, reasonable repair and reinforcement measures are required to solve the problem.

[0003] Among them, piers, as the main load-bearing components for vertical loads, are often the focus of structural reinforcement. The load-bearing capacity and durability of piers are key to the structural safety performance.

[0004] Currently, common reinforcement methods for concrete-tube steel structures all have certain limitations. For example, using ordinary concrete to increase the cross-section has a significant impact on the structure's self-weight. UHPC, with its excellent mechanical properties and superior durability, can overcome these problems to some extent. However, there is very little research on the use of UHPC for reinforcement of concrete-tube steel structures. Utility Model Content

[0005] The purpose of this invention is to provide a method for reinforcing CFST piers with an outer CFRP fabric and an inner UHPC filling, which can reduce the increased size and self-weight of CFST piers during reinforcement and can better increase the structural ductility.

[0006] The specific technical solution adopted by this utility model is as follows:

[0007] A method for reinforcing CFST piers with an outer CFRP fabric and an inner UHPC filling includes multiple round-headed studs and a layer of carbon fiber mesh fixedly connected to the outside of the CFST pier. The CFST pier includes a concrete column, and a steel pipe is fixedly connected to the outside of the concrete column.

[0008] The round-headed studs are welded to the outside of the steel pipe, the carbon fiber mesh is fixed to the outside of the steel pipe, and the round-headed studs penetrate the carbon fiber mesh. A UHPC reinforcement layer is fixedly connected to the outside of the carbon fiber mesh and the round-headed studs, and a carbon fiber cloth is fixedly connected to the outside of the UHPC reinforcement layer.

[0009] Furthermore, it also includes two arc-shaped frames, which can be assembled on the outside of the steel pipe to form a nail positioning bracket, and multiple round-headed studs are respectively installed on the two arc-shaped frames;

[0010] The arc-shaped frame includes an arc-shaped guide frame, a vertical guide frame, and a frame structure. The frame structure includes two vertical support plates and two horizontal support plates. The upper and lower ends of one vertical support plate are fixedly connected to one end of each of the two horizontal support plates, and the upper and lower ends of the other vertical support plate are fixedly connected to the other ends of each of the two horizontal support plates. A horizontal slide groove and a second inlet / outlet located at one end of the horizontal slide groove are provided on the outer side of the horizontal support plate. The horizontal slide groove and the second inlet / outlet are connected. A vertical slide groove and a first inlet / outlet located at the upper end of the vertical slide groove are provided on the inner side of the vertical support plate. The vertical slide groove and the first inlet / outlet are connected. A second slider is fixedly connected to both the upper and lower ends of the inner side of the vertical guide frame. The second slider can enter the interior of the horizontal slide groove through the second inlet / outlet and can slide vertically inside the horizontal slide groove. A first slider is fixedly connected to both ends of the outer side of the arc-shaped guide frame. The first slider can enter the interior of the vertical slide groove through the first inlet / outlet and can slide vertically inside the vertical slide groove.

[0011] The arc-shaped guide frame has an arc-shaped positioning groove inside, and the vertical guide frame has a vertical positioning groove inside. The overlapping area of ​​the arc-shaped positioning groove and the vertical positioning groove is the installation area, and multiple round-headed studs are respectively fixedly connected to multiple installation areas.

[0012] Furthermore, a second return spring is fixedly connected to both the upper and lower sides of the arc-shaped guide frame. A second threaded block is fixedly connected to the end of the second return spring away from the arc-shaped guide frame. Adjacent second threaded blocks are connected by a second double-hole threaded connecting sleeve. The second threaded block and the second double-hole threaded connecting sleeve are threadedly connected. A second single-hole threaded connecting sleeve is rotatably connected to the side of the two transverse support plates that are close to each other. The second single-hole threaded connecting sleeve is threadedly connected to the outside of the second threaded block.

[0013] Both sides of the vertical guide frame are fixedly connected to a first return spring. The end of the first return spring away from the vertical guide frame is fixedly connected to a first threaded block. Two adjacent first threaded blocks are connected by a first double-hole threaded connecting sleeve. The first threaded block and the first double-hole threaded connecting sleeve are threadedly connected. Both vertical support plates are rotatably connected to a first single-hole threaded connecting sleeve. The first single-hole threaded connecting sleeve is threaded to the outside of the first threaded block.

[0014] Furthermore, a nail mounting block is inserted inside the mounting area. The round-headed stud includes a stud shaft, which is installed inside the nail mounting block. One end of the stud shaft is fixedly connected to a round head. A first limiting ring is fixedly connected to the outer side of the nail mounting block near the round head. A magnet is fixedly connected to the first limiting ring.

[0015] Furthermore, a nail mounting block is inserted inside the mounting area. The round-headed stud includes a stud shaft, which is installed inside the nail mounting block. One end of the stud shaft is fixedly connected to a round head. A first limiting ring is fixedly connected to the outer end of the nail mounting block near the round head. An external thread is provided on the outer side of the nail mounting block away from the round head. A second limiting ring is threaded to the outer side of the external thread.

[0016] The technical effects achieved by this utility model are as follows:

[0017] (1) The present invention provides a method for reinforcing CFST piers with external CFRP cloth and internal UHPC by using high ductility materials such as carbon fiber mesh and carbon fiber cloth to improve the ductility of the reinforced column. The UHPC reinforcement layer makes the structure lightweight, high-strength, durable, corrosion-resistant and easy to construct. Compared with the existing reinforcement methods, this technical solution increases the original size and self-weight of the structure less and increases the ductility of the structure better. The reinforcement effect is twice as effective and has good social and economic benefits.

[0018] (2) The present invention provides a method for reinforcing CFST piers with external CFRP cloth and internal UHPC by integrating multiple round-headed studs into an arc-shaped frame. This method allows the positioning of the round-headed studs to be carried out in advance. By positioning the round-headed studs in advance, the positioning work can be completed on the construction site by simply fixing two arc-shaped frames to the outside of the steel pipe. This reduces the positioning work of the round-headed studs on the pier reinforcement site, thereby reducing the difficulty of reinforcing the pier. Attached Figure Description

[0019] Figure 1 This is a cross-sectional structural diagram of Embodiment 1 of this utility model;

[0020] Figure 2 These are schematic diagrams of the structure in embodiments 2-3 of this utility model;

[0021] Figure 3 These are schematic diagrams of the structure in embodiments 2-3 of this utility model;

[0022] Figure 4 This is a schematic diagram of the arc-shaped frame of this utility model;

[0023] Figure 5 This is an exploded structural diagram of the arc-shaped frame of this utility model;

[0024] Figure 6 This is a utility model Figure 4 A magnified view of a section at point A in the middle;

[0025] Figure 7 This is a utility model Figure 4 Schematic diagram of the cross-sectional structure at point A in the middle;

[0026] Figure 8 This is a schematic diagram of the outer shell of this utility model;

[0027] Figure 9 This is a schematic diagram of the position adjustment mechanism of this utility model;

[0028] Figure 10 This is a utility model Figure 9 A magnified view of a section at point B.

[0029] The attached diagram lists the components represented by each number as follows:

[0030] 1. Concrete column; 2. Steel pipe; 3. Carbon fiber mesh; 4. UHPC reinforcement layer; 5. Round-headed studs; 6. Carbon fiber cloth; 7. Vertical support plate; 8. Horizontal support plate; 9. Vertical slide rail; 10. First inlet / outlet; 11. Horizontal slide rail; 12. Second inlet / outlet; 13. Arc-shaped guide frame; 14. First slider; 15. Vertical guide frame; 16. Second slider; 17. First return spring; 18. First threaded block; 19. First double-hole threaded connecting sleeve; 20. First single-hole threaded connecting sleeve; 21. Second return spring; 22. Second threaded block; 23. Second double-hole threaded connecting sleeve. 24. Sleeve; 25. Second single-hole threaded connecting sleeve; 26. Nail body mounting block; 27. Stud rod body; 28. Nail body round head; 29. ​​First limiting ring; 30. Magnet block; 31. Second limiting ring; 32. Third return spring; 33. Arc-shaped surface; 34. Coating layer; 35. Welding core; 36. Outer shell; 37. Connecting plate; 38. Connecting bolt; 39. Vertical guide rail; 40. First servo motor; 41. Screw; 42. Connecting slider; 43. Arc-shaped guide rail; 44. Slide block; 45. Second servo motor; 46. Gear; 47. Gear groove; 48. Electric push rod; 49. Conductive block. Detailed Implementation

[0031] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0032] Example 1:

[0033] like Figure 1 As shown, a CFST pier reinforced with UHPC inside a CFRP cloth outer layer includes multiple round-headed studs 5 and a layer of carbon fiber mesh 3 fixedly connected to the outside of the CFST pier. The CFST pier includes a concrete column 1, and a steel pipe 2 is fixedly connected to the outside of the concrete column 1.

[0034] Here, the carbon fiber mesh 3 can also be replaced with glass fiber mesh, polypropylene fiber mesh, etc.

[0035] Round-headed studs 5 are welded to the outside of steel pipe 2. Carbon fiber mesh 3 is wrapped and fixed to the outside of steel pipe 2. When wrapping carbon fiber mesh 3, through holes need to be made on carbon fiber mesh 3 at positions opposite to steel pipe 2 so that round-headed studs 5 can penetrate carbon fiber mesh 3. UHPC reinforcement layer 4 is fixedly connected to the outside of carbon fiber mesh 3 and round-headed studs 5. Carbon fiber cloth 6 is fixedly connected to the outside of UHPC reinforcement layer 4. At this time, by using high-ductility materials such as carbon fiber mesh 3 and carbon fiber cloth 6, the ductility of the reinforced column is significantly improved. UHPC reinforcement layer 4 makes the structure lightweight, high-strength, durable, corrosion-resistant, and easy to construct. Compared with existing reinforcement methods, this technical solution increases the original size and self-weight of the structure less and increases the ductility of the structure more effectively. The reinforcement effect is twice as effective and has good social and economic benefits.

[0036] Meanwhile, carbon fiber cloth 6 can also be replaced with carbon fiber board, glass fiber cloth, glass fiber board, or polypropylene fiber cloth.

[0037] Example 2:

[0038] like Figures 1-7 As shown, this technical solution improves the installation method of the round-headed studs 5 based on Embodiment 1. Specifically, the CFST pier reinforcement with external CFRP cloth and internal UHPC filling also includes two arc-shaped frames. The two arc-shaped frames can be spliced ​​together on the outside of the steel pipe 2 to form a nail positioning bracket. Multiple round-headed studs 5 are respectively installed on the two arc-shaped frames. By integrating multiple round-headed studs 5 into the arc-shaped frames, the positioning work of the round-headed studs 5 can be carried out in advance. By moving the positioning work of the round-headed studs 5 forward, on the construction site, it is only necessary to fix the two arc-shaped frames to the outside of the steel pipe 2 to complete the positioning work of multiple round-headed studs 5, reducing the positioning work of the round-headed studs 5 on the pier reinforcement site, thereby reducing the difficulty of reinforcing the pier.

[0039] Among them, such as Figures 2-6As shown, the arc-shaped frame includes an arc-shaped guide frame 13, a vertical guide frame 15, and a frame structure. The frame structure includes two vertical support plates 7 and two horizontal support plates 8. The upper and lower ends of one vertical support plate 7 are fixedly connected to one end of each of the two horizontal support plates 8, and the upper and lower ends of the other vertical support plate 7 are fixedly connected to the other ends of each of the two horizontal support plates 8. A horizontal slide groove 11 and a second inlet / outlet 12 located at one end of the horizontal slide groove 11 are provided on the outer side of the horizontal support plate 8. The horizontal slide groove 11 and the second inlet / outlet 12 are connected. A vertical slide groove 9 and a first inlet / outlet 10 located at the upper end of the vertical slide groove 9 are provided on the inner side of the vertical support plate 7. The vertical slide groove 9 and the first inlet / outlet 10 are connected. The vertical guide frame 15 is connected to the upper and lower ends of the inner side of the vertical guide frame 15. The second slider 16 can enter the interior of the horizontal slide groove 11 through the second inlet and outlet 12, and the second slider 16 can slide inside the horizontal slide groove 11, so that the position of the vertical guide frame 15 can be adjusted on the horizontal support plate 8. The two ends of the outer side of the arc guide frame 13 are fixedly connected to the first slider 14. The first slider 14 can enter the interior of the vertical slide groove 9 through the first inlet and outlet 10, and the first slider 14 can slide vertically inside the vertical slide groove 9, so that the corresponding number of arc guide frames 13 and vertical guide frames 15 can be installed on the arc frame according to the number of round head studs 5.

[0040] The arc-shaped guide frame 13 has an arc-shaped positioning groove inside, and the vertical guide frame 15 has a vertical positioning groove inside. The overlapping area of ​​the arc-shaped positioning groove and the vertical positioning groove is the installation area. Multiple round-headed studs 5 are fixedly connected to multiple installation areas, so that a corresponding number of round-headed studs 5 can be set on the outside of the CFST pier according to its reinforcement requirements.

[0041] like Figures 3-6 As shown, a second return spring 21 is fixedly connected to both the upper and lower sides of the arc-shaped guide frame 13. A second threaded block 22 is fixedly connected to the end of the second return spring 21 away from the arc-shaped guide frame 13. Two adjacent second threaded blocks 22 can be connected by a second double-hole threaded connecting sleeve 23. The second threaded block 22 and the second double-hole threaded connecting sleeve 23 are threadedly connected. The arrangement of the second threaded block 22 and the second double-hole threaded connecting sleeve 23 can form an elastic element between the two second return springs 21 between the two arc-shaped guide frames 13. By rotating the second double-hole threaded connecting sleeve 23, the second double-hole threaded connecting sleeve 23 can be threadedly connected to the outside of the two second threaded blocks 22. The elastic force of the elastic element between multiple arc-shaped guide frames 13 can automatically adjust the distance between two adjacent arc-shaped guide frames 13, so that multiple arc-shaped guide frames 13 are evenly distributed.

[0042] Two transverse support plates 8 are rotatably connected to a second single-hole threaded sleeve 24 on the side that is close to each other. The second single-hole threaded sleeve 24 can be threaded to the outside of the second threaded block 22, so that multiple arc-shaped guide frames 13 can be automatically evenly distributed between the two transverse support plates 8 under the elastic force of the second return spring 21.

[0043] First return springs 17 are fixedly connected to both the left and right sides of the vertical guide frame 15. A first threaded block 18 is fixedly connected to the end of the first return spring 17 away from the vertical guide frame 15. Two adjacent first threaded blocks 18 can be connected by a first double-hole threaded connecting sleeve 19. The first threaded block 18 and the first double-hole threaded connecting sleeve 19 are threadedly connected. The arrangement of the first threaded block 18 and the first double-hole threaded connecting sleeve 19 can form two first return springs 17 between two vertical guide frames 15 into an elastic element. By rotating the first double-hole threaded connecting sleeve 19, the first double-hole threaded connecting sleeve 19 can be threadedly connected to the outside of the two first threaded blocks 18. The elastic force of the elastic element between multiple vertical guide frames 15 can automatically adjust the distance between two adjacent vertical guide frames 15, so that multiple vertical guide frames 15 are evenly distributed.

[0044] Both vertical support plates 7 are rotatably connected with a first single-hole threaded connecting sleeve 20. The first single-hole threaded connecting sleeve 20 can be threaded to the outside of the first threaded block 18, so that multiple vertical guide frames 15 can be automatically evenly distributed between the two vertical guide frames 15 under the elastic force of the first return spring 17. The setting of the second return spring 21 and the first return spring 17 can make it easier to position the arc-shaped guide frame 13 and the vertical guide frame 15 after they are installed in the frame structure, so that the round-headed studs 5 installed on the arc-shaped guide frame 13 and the vertical guide frame 15 can be evenly distributed.

[0045] Here, the first double-hole threaded connecting sleeve 19 and the second double-hole threaded connecting sleeve 23 each have two threaded holes. The two threaded holes are symmetrically arranged so that when the first double-hole threaded connecting sleeve 19 and the second double-hole threaded connecting sleeve 23 rotate in one direction, the two second threaded blocks 22 can be rotatably connected inside the threaded holes.

[0046] A threaded hole is provided on both the first single-hole threaded connecting sleeve 20 and the second single-hole threaded connecting sleeve 24, and the second threaded block 22 can be threaded into the first single-hole threaded connecting sleeve 20 or the second single-hole threaded connecting sleeve 24.

[0047] like Figures 6-7As shown, the installation method of the round-headed stud 5 in the installation area is disclosed here. A stud body mounting block 25 is inserted into the installation area. The round-headed stud 5 includes a stud body 26, which is installed inside the stud body mounting block 25. One end of the stud body 26 is fixedly connected to a stud body round head 27. One end of the stud body round head 27 may be provided with an arc-shaped surface 32. The arc-shaped surface 32 is set in the same shape as the steel pipe 2, so that the stud body round head 27 and the steel pipe 2 fit closely. A first limiting ring 28 is fixedly connected to the outer side of the stud body mounting block 25 near the stud body round head 27. A magnet block 29 may be fixedly connected to the first limiting ring 28. The nail mounting block 25 can be magnetically attracted to the arc-shaped guide frame 13 by the magnet 29, thus completing the positioning of the nail mounting block 25. An external thread can be provided on the outer side of the nail mounting block 25 away from the nail head 27. The outer side of the external thread is connected to the second limiting ring 30. By setting the first limiting ring 28 and the second limiting ring 30 on the inner and outer sides of the arc-shaped guide frame 13 and the vertical guide frame 15 respectively, the nail mounting block 25 can be limited by the first limiting ring 28 and the second limiting ring 30, reducing the phenomenon of the nail mounting block 25 falling off the arc-shaped guide frame 13 and the vertical guide frame 15.

[0048] The stud rod 26 can be fixedly connected inside the stud mounting block 25, or it can be like... Figures 6-7 As shown, the stud rod 26 is slidably connected inside the stud mounting block 25, and a third return spring 31 is fixedly connected between the first limiting ring 28 and the stud head 27. The third return spring 31 can make the arc surface 32 and the steel pipe 2 fit tightly together.

[0049] Example 3:

[0050] like Figures 1-10 As shown, this technical solution improves the structure of the arc-shaped frame based on embodiment 2. Specifically, an outer shell 35 is fixedly connected to the outside of the vertical support plate 7 and the horizontal support plate 8. Connecting plates 36 are fixedly connected to both sides of the outer shell 35. The connecting plates 36 on the two outer shells 35 are connected by connecting bolts 37, so that the two outer shells 35 form a complete protective cover on the outside of the steel pipe 2. A position adjustment mechanism is fixedly connected inside the outer shell 35. A conductive block 48 is installed on the position adjustment mechanism. A welding core 34 is fixedly connected to the outside of the round head 27 of the nail body. A flux coating layer 33 is fixedly connected to the outside of the welding core 34. The side of the welding core 34 away from the nail mounting block 25 is directly exposed. The flux coating layer 33 is a coating layer pressed onto the surface of the welding core 34, which can stabilize the electric arc and make the arc burn more stably, which helps to improve the welding quality.

[0051] At this time, one electrode of the welding machine is electrically connected to the conductive block 48, and the other electrode is electrically connected to the steel pipe 2. Then, the electric push rod 47 is moved by the position adjustment mechanism so that the conductive block 48 and the stud rod 26 abut against each other. The current is then guided to the welding core 34 through the stud rod 26 and the stud head 27 as conductive structures, and the heat energy is concentrated on the welding core 34, so that the welding core 34 can complete the welding between the stud head 27 and the steel pipe 2. This makes it easier to weld the stud head 27 and reduces the manual welding process of the stud head 27.

[0052] The position adjustment mechanism includes a vertical guide rail 38 fixedly connected to the inner wall of the outer casing 35, a connecting slider 41 slidably connected to the vertical guide rail 38, a first servo motor 39 fixedly connected to the outer casing 35, a vertically arranged screw 40 fixedly connected to the output end of the first servo motor 39, and a threaded connection between the screw 40 and the connecting slider 41. Activating the first servo motor 39 drives the connecting slider 41 to move vertically. An arc-shaped guide rail 42 is fixedly connected to the connecting slider 41, a slide block 43 slidably connected to the arc-shaped guide rail 42, and a second servo motor fixedly connected to the inner side of the slide block 43. The second servo motor 44 is fixedly connected to the output end of the electric push rod 44 and the electric push rod 47. The output end of the electric push rod 47 is fixedly connected to the gear 45. The inner side of the arc-shaped guide rail 42 is provided with a toothed groove 46. The gear 45 and the toothed groove 46 are meshed. At this time, by starting the second servo motor 44, the gear 45 can be driven to rotate. Under the thrust between the gear 45 and the toothed groove 46, the slide block 43 can slide on the arc-shaped guide rail 42. Starting the electric push rod 47 can drive the conductive block 48 to move, so that the position of the conductive block 48 can be freely adjusted.

[0053] Meanwhile, a battery can be installed on the outer casing 35 to power the electrical equipment in this technical solution.

[0054] Example 4:

[0055] A construction method for reinforcing CFST piers with external CFRP fabric and internal UHPC grouting includes the following steps:

[0056] Step 1: Weld round-headed studs 5 at equal intervals on the outside of steel pipe 2;

[0057] Step 2: Use a high-pressure water gun to clean the dust and residue on the column;

[0058] Step 3: Arrange a layer of carbon fiber mesh 3 on the outside of the steel pipe 2 for fixed connection;

[0059] Step 4: Install a mold on the outside of the steel pipe 2, located outside the carbon fiber mesh 3 and the round-headed stud 5;

[0060] Step 5: Pour UHPC into the mold without vibration. Let it stand for 24 hours to form UHPC reinforcement layer 4. Then remove the mold and cure for one week.

[0061] Step 6: Wrap a layer of carbon fiber cloth 6 around the outside of the UHPC reinforcement layer 4 after curing to complete the reinforcement.

[0062] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A method for reinforcing CFST piers with an outer CFRP fabric covering and an inner UHPC filling, characterized in that: Includes multiple round-headed studs (5) and a layer of carbon fiber mesh (3) fixedly connected to the outside of the CFST pier column. The CFST pier column includes a concrete column (1) and a steel pipe (2) is fixedly connected to the outside of the concrete column (1). The round-headed stud (5) is welded to the outside of the steel pipe (2), the carbon fiber mesh (3) is fixed to the outside of the steel pipe (2), and the round-headed stud (5) penetrates the carbon fiber mesh (3). The carbon fiber mesh (3) and the outside of the round-headed stud (5) are fixedly connected to a UHPC reinforcement layer (4), and the outside of the UHPC reinforcement layer (4) is fixedly connected to a carbon fiber cloth (6).

2. The CFST pier reinforced with an outer CFRP fabric and an inner UHPC grouting method according to claim 1, characterized in that: It also includes two arc-shaped frames, which can be assembled into a nail positioning bracket on the outside of the steel pipe (2), and multiple round-headed studs (5) are respectively installed on the two arc-shaped frames; The arc-shaped frame includes an arc-shaped guide frame (13), a vertical guide frame (15), and a frame structure. The frame structure includes two vertical support plates (7) and two horizontal support plates (8). The upper and lower ends of one of the vertical support plates (7) are fixedly connected to one end of the two horizontal support plates (8), respectively. The upper and lower ends of the other vertical support plate (7) are fixedly connected to the other ends of the two horizontal support plates (8), respectively. A horizontal groove (11) and a second inlet / outlet (12) located at one end of the horizontal groove (11) are provided on the outer side of the horizontal support plate (8). The horizontal groove (11) and the second inlet / outlet (12) are connected. A vertical groove is provided on the inner side of the vertical support plate (7). 9) and the first inlet and outlet (10) located at the upper end of the vertical slide groove (9), the vertical slide groove (9) and the first inlet and outlet (10) are connected, the upper and lower ends of the inner side of the vertical guide frame (15) are fixedly connected with the second slider (16), the second slider (16) can enter the interior of the horizontal slide groove (11) through the second inlet and outlet (12), and the second slider (16) can slide inside the horizontal slide groove (11), the two ends of the outer side of the arc-shaped guide frame (13) are fixedly connected with the first slider (14), the first slider (14) can enter the interior of the vertical slide groove (9) through the first inlet and outlet (10), and the first slider (14) can slide vertically inside the vertical slide groove (9); The arc-shaped guide frame (13) has an arc-shaped positioning groove inside, and the vertical guide frame (15) has a vertical positioning groove inside. The overlapping position of the arc-shaped positioning groove and the vertical positioning groove is the installation area, and multiple round-headed studs (5) are fixedly connected to multiple installation areas respectively.

3. The CFST pier reinforced with an outer CFRP fabric and an inner UHPC grouting method according to claim 2, characterized in that: The upper and lower sides of the arc-shaped guide frame (13) are fixedly connected with second return springs (21). The end of the second return spring (21) away from the arc-shaped guide frame (13) is fixedly connected with a second threaded block (22). Two adjacent second threaded blocks (22) are connected by a second double-hole threaded connecting sleeve (23). The second threaded block (22) and the second double-hole threaded connecting sleeve (23) are threadedly connected. The two transverse support plates (8) are rotatably connected to a second single-hole threaded connecting sleeve (24) on the side that is close to each other. The second single-hole threaded connecting sleeve (24) is threadedly connected to the outside of the second threaded block (22). The left and right sides of the vertical guide frame (15) are fixedly connected with a first return spring (17). The end of the first return spring (17) away from the vertical guide frame (15) is fixedly connected with a first threaded block (18). Two adjacent first threaded blocks (18) are connected by a first double-hole threaded connecting sleeve (19). The first threaded block (18) and the first double-hole threaded connecting sleeve (19) are threadedly connected. The two vertical support plates (7) are rotatably connected with a first single-hole threaded connecting sleeve (20). The first single-hole threaded connecting sleeve (20) is threadedly connected to the outside of the first threaded block (18).

4. The CFST pier reinforced with an outer CFRP fabric and an inner UHPC grouting method according to claim 2, characterized in that: A nail mounting block (25) is inserted inside the installation area. The round-headed stud (5) includes a stud rod (26). The stud rod (26) is installed inside the nail mounting block (25), and a nail round head (27) is fixedly connected to one end of the stud rod (26). A first limiting ring (28) is fixedly connected to one end of the nail mounting block (25) near the nail round head (27). A magnet block (29) is fixedly connected to the first limiting ring (28).

5. The CFST pier reinforced with an outer CFRP fabric and an inner UHPC grouting method according to claim 2, characterized in that: A nail mounting block (25) is inserted inside the installation area. The round-headed stud (5) includes a stud rod (26). The stud rod (26) is installed inside the nail mounting block (25), and a nail head (27) is fixedly connected to one end of the stud rod (26). A first limiting ring (28) is fixedly connected to one end of the nail mounting block (25) near the nail head (27). An external thread is provided on the outside of the nail mounting block (25) away from the nail head (27). A second limiting ring (30) is threaded to the outside of the external thread.

6. The CFST pier reinforced with UHPC internally wrapped with CFRP fabric according to claim 5, characterized in that: One end of the round head (27) of the nail body is provided with an arc-shaped surface (32).

7. The CFST pier reinforced with an outer CFRP fabric and an inner UHPC grouting method according to claim 5, characterized in that: The stud rod (26) is slidably connected inside the stud mounting block (25), and a third return spring (31) is fixedly connected between the first limiting ring (28) and the stud head (27).

8. The CFST pier reinforced with UHPC internally wrapped with CFRP fabric according to claim 5, characterized in that: The outer sides of the vertical support plate (7) and the horizontal support plate (8) are fixedly connected to the outer shell (35). The two sides of the outer shell (35) are fixedly connected to the connecting plate (36). The connecting plates (36) on the two outer shells (35) are connected by connecting bolts (37). The inner side of the outer shell (35) is fixedly connected to the position adjustment mechanism. The position adjustment mechanism is equipped with a conductive block (48). The outer side of the round head (27) of the nail body is fixedly connected to the welding core (34). The outer side of the welding core (34) is fixedly connected to a layer of flux coating (33).

9. The CFST pier reinforced with an outer CFRP fabric and an inner UHPC grouting method according to claim 8, characterized in that: The position adjustment mechanism includes a vertical guide rail (38) fixedly connected to the inner wall of the outer shell (35), a connecting slider (41) slidably connected vertically to the vertical guide rail (38), a first servo motor (39) fixedly connected to the outer shell (35), a vertically arranged screw (40) fixedly connected to the output end of the first servo motor (39), the screw (40) and the connecting slider (41) being threadedly connected, and an arc-shaped guide rail (4) fixedly connected to the connecting slider (41). 2) A slide block (43) is slidably connected on the arc-shaped guide rail (42). A second servo motor (44) and an electric push rod (47) are fixedly connected to the inner side of the slide block (43). The piston rod of the electric push rod (47) and the conductive block (48) are fixedly connected. A meshing gear (45) is fixedly connected to the output end of the second servo motor (44). A meshing groove (46) is opened on the inner side of the arc-shaped guide rail (42). The meshing gear (45) and the meshing groove (46) are meshed together.

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