A CFRP cloth-encased UHPC reinforced CFST pier column and a construction method thereof

Abstract

The application belongs to the technical field of CFST pier column reinforcement, and particularly relates to a CFRP cloth-encased UHPC reinforced CFST pier column and a construction method thereof, which 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 round head studs, and the outer side of the UHPC reinforcing layer is fixedly connected with carbon fiber cloth. The high ductility materials such as the carbon fiber grid and the carbon fiber cloth are used to improve the ductility of the reinforced column, the UHPC reinforcing layer makes the structure light in quality, high in strength, durable and corrosion-resistant, and easy to construct, compared with the existing reinforcement method, the size and self weight of the CFST pier column can be reduced when the CFST pier column is reinforced, and the structural ductility can be improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of CFST pier column reinforcement, and particularly relates to a CFST pier column reinforced by wrapping CFRP cloth and pouring UHPC inside and a construction method. BACKGROUND

[0002] With the increase of the service life of buildings, whether the building bearing capacity is insufficient due to improper design, or the building quality is low due to supervision problems during construction, or the building is damaged due to natural disasters, reasonable maintenance and reinforcement measures need to be taken to solve the problems.

[0003] Among them, the pier column is the main load-bearing component of the vertical load, and is often the focus of structural reinforcement. The bearing capacity and durability of the pier column are the key to the safety performance of the structure.

[0004] Nowadays, the commonly used reinforcement methods for steel pipe concrete structures have certain limitations, such as the method of increasing the section of ordinary concrete for reinforcement, which has a greater impact on the self-weight of the structure. UHPC can overcome these problems to a certain extent due to its excellent mechanical properties and excellent durability, but there are few studies on the use of UHPC to reinforce steel pipe concrete structures. SUMMARY

[0005] The purpose of the application is to provide a CFST pier column reinforced by wrapping CFRP cloth and pouring UHPC inside and a construction method, which can reduce the size and self-weight of the CFST pier column when reinforcing the CFST pier column, and can better increase the structural ductility.

[0006] The technical scheme adopted by the application is as follows:

[0007] A CFST pier column reinforced by wrapping CFRP cloth and pouring UHPC inside, comprising a plurality of round head studs fixedly connected to the outer side of the CFST pier column and a layer of carbon fiber grid, the CFST pier column comprising a concrete column, and the outer side of the concrete column being fixedly connected with a steel pipe;

[0008] 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, and the round head studs penetrate the carbon fiber grid, the outer side of the carbon fiber grid and the round head studs being fixedly connected with a UHPC reinforcing layer, and the outer side of the UHPC reinforcing layer being fixedly connected with a carbon fiber cloth.

[0009] Further, two arc-shaped frames are further included, the two arc-shaped frames being capable of being spliced into a stud positioning support on the outer side of the steel pipe, and the plurality of round head studs being respectively installed on the two arc-shaped frames;

[0010] The arc-shaped frame comprises an arc-shaped guide frame, a vertical guide frame and a frame structure, the frame structure comprises two vertical support plates and two horizontal support plates, one end of each of the two vertical support plates is fixedly connected with one end of the two horizontal support plates, the other end of each of the two vertical support plates is fixedly connected with the other end of the two horizontal support plates, a horizontal sliding groove and a second inlet and outlet located at one end of the horizontal sliding groove are formed on the outer side of the horizontal support plate, the horizontal sliding groove and the second inlet and outlet are in communication, a vertical sliding groove and a first inlet and outlet located at the upper end of the vertical sliding groove are formed on the inner side of the vertical support plate, the vertical sliding groove and the first inlet and outlet are in communication, a second sliding block is fixedly connected to the upper and lower ends of the inner side of the vertical guide frame, the second sliding block can enter the inside of the horizontal sliding groove through the second inlet and outlet, and the second sliding block is slidably connected in the horizontal sliding groove, a first sliding block is fixedly connected to the two ends of the outer side of the arc-shaped guide frame, the first sliding block can enter the inside of the vertical sliding groove through the first inlet and outlet, and the first sliding block can vertically slide in the vertical sliding groove.

[0011] An arc-shaped positioning groove is formed in the inside of the arc-shaped guide frame, a vertical positioning groove is formed in the inside of the vertical guide frame, and the overlapping position of the arc-shaped positioning groove and the vertical positioning groove is an installation area, a plurality of round head pegs are fixedly connected to the plurality of installation areas.

[0012] Further, a second return spring is fixedly connected to 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, two adjacent second threaded blocks are connected through a second double-hole threaded connection sleeve, the second threaded block and the second double-hole threaded connection sleeve are threadedly connected, a second single-hole threaded connection sleeve is rotatably connected to one side of each of the two horizontal support plates, and the second single-hole threaded connection sleeve is threadedly connected to the outside of the second threaded block.

[0013] A first return spring is fixedly connected to the left and right sides of the vertical guide frame, a first threaded block is fixedly connected to the end of the first return spring away from the vertical guide frame, two adjacent first threaded blocks are connected through a first double-hole threaded connection sleeve, the first threaded block and the first double-hole threaded connection sleeve are threadedly connected, and a first single-hole threaded connection sleeve is rotatably connected to each of the two vertical support plates, and the first single-hole threaded connection sleeve is threadedly connected to the outside of the first threaded block.

[0014] Further, a nail body mounting block is inserted into the inside of the installation area, the round head peg comprises a peg shaft, the peg shaft is mounted in the inside of the nail body mounting block, a nail body round head is fixedly connected to one end of the peg shaft, a first limiting ring is fixedly connected to the end of the nail body mounting block close to the nail body round head, and a magnet block is fixedly connected to the first limiting ring.

[0015] Further, a nail body mounting block is inserted in the mounting area, the round head stud includes a stud rod body, the stud rod body is mounted in the inside of the nail body mounting block, and one end of the stud rod body is fixedly connected with a nail body round head, one end of the nail body round head is fixedly connected with a first limiting ring outside the nail body mounting block, and an external thread screw is arranged at the position away from the nail body round head outside the nail body mounting block, and the external thread screw is threadedly connected with a second limiting ring outside.

[0016] A construction method of a CFST pier column reinforced by a UHPC reinforced by a CFRP cloth, comprising the following steps:

[0017] Step 1: welding round head studs on the outside of the steel pipe;

[0018] Step 2: cleaning the dust and residues on the column with a water gun;

[0019] Step 3: arranging a layer of carbon fiber mesh on the outside of the steel pipe and fixedly connecting;

[0020] Step 4: installing a mold outside the carbon fiber mesh and the round head studs on the outside of the steel pipe;

[0021] Step 5: pouring UHPC into the mold, forming a UHPC reinforced layer after standing, then removing the mold and curing for one week;

[0022] Step 6: wrapping a layer of carbon fiber cloth on the outside of the UHPC reinforced layer after curing.

[0023] The technical effects obtained by the present application are:

[0024] (1) The CFST pier column reinforced by a UHPC reinforced by a CFRP cloth uses high ductility materials such as carbon fiber mesh and carbon fiber cloth to better improve the ductility of the reinforced column, the UHPC reinforced layer makes the structure light in quality, high in strength, durable and corrosion-resistant, and easy to construct, compared with the existing reinforcement method, the technical solution of the present application increases the original size and self weight of the structure, and better improves the ductility of the structure, and the reinforcement effect is doubled, and the present application has good social and economic benefits.

[0025] (2) The CFST pier column reinforced by a UHPC reinforced by a CFRP cloth integrates multiple round head studs in the arc-shaped frame, can perform the positioning work of the round head studs in advance, and prepositions the positioning work of the round head studs, so that the positioning work of the multiple round head studs can be completed by only fixedly connecting two arc-shaped frames on the outside of the steel pipe in the construction site, reduces the positioning work of the round head studs in the pier column reinforcement site, and thus reduces the difficulty of reinforcing the pier column. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a cut structure schematic view in the embodiment 1 of the present application.

[0027] Figure 2 These are schematic diagrams of the structures in embodiments 2-3 of the present invention;

[0028] Figure 3 These are schematic diagrams of the structures in embodiments 2-3 of the present invention;

[0029] Figure 4 This is a schematic diagram of the arc-shaped frame of the present invention;

[0030] Figure 5 This is an exploded structural diagram of the arc-shaped frame of the present invention;

[0031] Figure 6 This is the present invention. Figure 4 A magnified view of a section at point A in the middle;

[0032] Figure 7 This is the present invention. Figure 4 Schematic diagram of the cross-sectional structure at point A in the middle;

[0033] Figure 8 This is a schematic diagram of the outer shell of the present invention;

[0034] Figure 9 This is a schematic diagram of the position adjustment mechanism of the present invention;

[0035] Figure 10 This is the present invention. Figure 9 A magnified view of a section at point B.

[0036] The attached diagram lists the components represented by each number as follows:

[0037] 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

[0038] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention.

[0039] Example 1:

[0040] like Figure 1 As shown, a CFST pier reinforced with UHPC inside CFRP cloth 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.

[0041] Here, the carbon fiber mesh 3 can also be replaced with glass fiber mesh, polypropylene fiber mesh, etc.

[0042] The round-head stud 5 is welded on the outer side of the steel pipe 2, the carbon fiber grid 3 is wrapped and fixed on the outer side of the steel pipe 2, and when wrapping the carbon fiber grid 3, a through hole is needed to be opened on the carbon fiber grid 3 and the position opposite to the steel pipe 2, so that the round-head stud 5 can penetrate the carbon fiber grid 3, the outer side of the carbon fiber grid 3 and the round-head stud 5 is fixedly connected with the UHPC reinforcing layer 4, and the outer side of the UHPC reinforcing layer 4 is fixedly connected with the carbon fiber cloth 6, at this time, the ductility of the reinforced column is better improved by using high ductility materials such as the carbon fiber grid 3 and the carbon fiber cloth 6, the UHPC reinforcing layer 4 makes the structure light in quality, high in strength, durable and corrosion-resistant, and convenient to construct, compared with the existing reinforcing method, the technical scheme has less increase in the original size and self-weight of the structure, and better increase in the structural ductility, and the reinforcing effect is doubled with half the effort, and has good social and economic benefits.

[0043] Meanwhile, the carbon fiber cloth 6 can also be replaced by a carbon fiber plate, a glass fiber cloth, a glass fiber plate or a polypropylene fiber cloth.

[0044] Embodiment 2:

[0045] As shown in Figures 1-7 the technical scheme improves the installation mode of the round-head stud 5 on the basis of embodiment 1, and specifically, the UHPC reinforced CFST pier column wrapped with CFRP cloth and filled with UHPC further comprises two arc-shaped frames, the two arc-shaped frames can be spliced into a stud positioning support on the outer side of the steel pipe 2, and the plurality of round-head studs 5 are respectively installed on the two arc-shaped frames, by integrating the plurality of round-head studs 5 on the arc-shaped frames, the positioning work of the round-head studs 5 can be performed in advance, the positioning work of the round-head studs 5 is preposed, and only the two arc-shaped frames need to be fixedly connected on the outer side of the steel pipe 2 in the construction site to complete the positioning work of the plurality of round-head studs 5, thereby reducing the positioning work of the round-head studs 5 in the pier column reinforcing site, and thus reducing the difficulty of reinforcing the pier column.

[0046] Among them, 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, one end of one vertical support plate 7 is fixedly connected with one end of two horizontal support plates 8, the other end of the vertical support plate 7 is fixedly connected with the other end of two horizontal support plates 8, the outer side of the horizontal support plate 8 is provided with a horizontal sliding groove 11 and a second inlet and outlet 12 located at one end of the horizontal sliding groove 11, the horizontal sliding groove 11 and the second inlet and outlet 12 are communicated, the inner side of the vertical support plate 7 is provided with a vertical sliding groove 9 and a first inlet and outlet 10 located at the upper end of the vertical sliding groove 9, the vertical sliding groove 9 and the first inlet and outlet 10 are communicated, the upper and lower ends of the inner side of the vertical guide frame 15 are fixedly connected with second sliding blocks 16, the second sliding blocks 16 can enter the inside of the horizontal sliding groove 11 through the second inlet and outlet 12, and the second sliding blocks 16 can be slidingly connected in the horizontal sliding groove 11, so that the position of the vertical guide frame 15 on the horizontal support plate 8 can be adjusted, the two ends of the outer side of the arc-shaped guide frame 13 are fixedly connected with first sliding blocks 14, the first sliding blocks 14 can enter the inside of the vertical sliding groove 9 through the first inlet and outlet 10, and the first sliding blocks 14 can be vertically slid in the vertical sliding groove 9, so that the corresponding number of arc-shaped guide frames 13 and vertical guide frames 15 can be installed on the arc-shaped frame according to the number of the round head studs 5;

[0047] The inside of the arc-shaped guide frame 13 is provided with an arc-shaped positioning groove, the inside of the vertical guide frame 15 is provided with a vertical positioning groove, and the overlapping position of the arc-shaped positioning groove and the vertical positioning groove is an installation area, a plurality of round head studs 5 are fixedly connected to the plurality of installation areas, so that the corresponding number of round head studs 5 can be arranged on the outer side of the CFST pier column according to the reinforcement requirements.

[0048] As shown in the figure, Figures 3-6 The upper and lower sides of the arc-shaped guide frame 13 are fixedly connected with second return springs 21, one 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 through a second double-hole threaded connection sleeve 23, the second threaded block 22 and the second double-hole threaded connection sleeve 23 are threadedly connected, the two second return springs 21 between two arc-shaped guide frames 13 can be formed into an elastic member through the second threaded block 22 and the second double-hole threaded connection sleeve 23, the second double-hole threaded connection sleeve 23 can be threadedly connected outside the two second threaded blocks 22 by rotating the second double-hole threaded connection sleeve 23, and the spacing between the two adjacent arc-shaped guide frames 13 can be automatically adjusted by the elastic force of the elastic member between the plurality of arc-shaped guide frames 13, so that the plurality of arc-shaped guide frames 13 are uniformly distributed;

[0049] The second single-hole threaded connecting sleeve 24 is rotationally connected to one side of each of the two transverse support plates 8, and can be threadedly connected to the outside of the second threaded block 22, so that the plurality of arc-shaped guide frames 13 are automatically and evenly distributed between the two transverse support plates 8 under the elastic force of the second return spring 21.

[0050] The first return spring 17 is fixedly connected to the left and right sides of the vertical guide frame 15, and the first threaded block 18 is fixedly connected to the end of the first return spring 17 away from the vertical guide frame 15. The first threaded block 18 and the first double-hole threaded connecting sleeve 19 are threadedly connected, and the first threaded block 18 and the first double-hole threaded connecting sleeve 19 are arranged to form an elastic member between the two vertical guide frames 15. The first double-hole threaded connecting sleeve 19 is threadedly connected to the outside of the two first threaded blocks 18, and the elastic member between the plurality of vertical guide frames 15 can automatically adjust the distance between the adjacent two vertical guide frames 15, so that the plurality of vertical guide frames 15 are evenly distributed.

[0051] The first single-hole threaded connecting sleeve 20 is rotationally connected to the two vertical support plates 7, and can be threadedly connected to the outside of the first threaded block 18, so that the plurality of vertical guide frames 15 are automatically and evenly distributed between the two vertical guide frames 15 under the elastic force of the first return spring 17. The arc-shaped guide frame 13 and the vertical guide frame 15 are arranged to be positioned relatively simply after being installed in the frame structure, and the round head pegs 5 installed on the arc-shaped guide frame 13 and the vertical guide frame 15 are evenly distributed.

[0052] The first double-hole threaded connecting sleeve 19 and the second double-hole threaded connecting sleeve 23 are both provided with two threaded holes, which are symmetrically arranged, so that the first double-hole threaded connecting sleeve 19 and the second double-hole threaded connecting sleeve 23 can be rotationally connected to the inside of the two second threaded blocks 22.

[0053] The first single-hole threaded connecting sleeve 20 and the second single-hole threaded connecting sleeve 24 are both provided with a threaded hole, and the second threaded block 22 can be threadedly connected to the inside of the first single-hole threaded connecting sleeve 20 or the second single-hole threaded connecting sleeve 24.

[0054] As 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.

[0055] 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.

[0056] Example 3:

[0057] 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.

[0058] At this time, one of the electrodes of the electric welding machine is electrically connected with the conductive block 48, and the other electrode is electrically connected with the steel pipe 2. At this time, the electric push rod 47 is moved by the position adjusting mechanism, so that the conductive block 48 abuts against the shank 26. Then, the shank 26 and the nail body round head 27 are used as a conductive structure to guide the electric current to the welding core 34, so that heat energy is concentrated on the welding core 34, and the welding core 34 completes the welding between the nail body round head 27 and the steel pipe 2. Thus, the nail body round head 27 can be welded more simply, and the manual welding process of the nail body round head 27 is reduced.

[0059] The position adjusting mechanism comprises a vertical guide rail 38 fixedly connected to the inner wall of the outer shell 35, a connecting sliding block 41 vertically and slidably connected to the vertical guide rail 38, a first servo motor 39 fixedly connected to the outer shell 35, a vertically arranged screw rod 40 fixedly connected to the output end of the first servo motor 39, and the connecting sliding block 41 is threadedly connected to the screw rod 40. The connecting sliding block 41 is vertically moved by starting the first servo motor 39. The connecting sliding block 41 is fixedly connected with an arc-shaped guide rail 42. The arc-shaped guide rail 42 is slidably connected with a sliding seat 43. The inner side of the sliding seat 43 is fixedly connected with a second servo motor 44 and an electric push rod 47. The piston rod of the electric push rod 47 is fixedly connected with a conductive block 48. The output end of the second servo motor 44 is fixedly connected with a meshing gear 45. The inner side of the arc-shaped guide rail 42 is provided with a meshing groove 46. The meshing gear 45 is meshingly connected with the meshing groove 46. At this time, the meshing gear 45 is rotated by starting the second servo motor 44. The sliding seat 43 is slidably connected with the arc-shaped guide rail 42 under the thrust action between the meshing gear 45 and the meshing groove 46. The conductive block 48 is moved by starting the electric push rod 47. Thus, the position of the conductive block 48 can be freely adjusted.

[0060] Meanwhile, a battery can be installed on the outer shell 35 to supply power to the electrical equipment in the technical solution.

[0061] Embodiment 4:

[0062] A construction method of a CFRP cloth-encased UHPC reinforced CFST pier column, comprising the following steps:

[0063] Step 1: welding round head nails 5 at equal intervals on the outer side of the steel pipe 2;

[0064] Step 2: cleaning the dust and residues on the column with a high-pressure water gun;

[0065] Step 3: arranging a layer of carbon fiber grid 3 on the outer side of the steel pipe 2 and fixedly connecting the same;

[0066] Step 4: installing a mold on the outer side of the steel pipe 2 outside the carbon fiber grid 3 and the round head nails 5;

[0067] Step 5: Pour UHPC into the mold, without vibration, and form the UHPC reinforcement layer 4 after 24h, then remove the mold and maintain for one week;

[0068] Step 6: Wrap a layer of carbon fiber cloth 6 on the outside of the UHPC reinforcement layer 4 after maintenance, and the reinforcement is completed.

[0069] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and refinements without departing from the principles of the present application, and these improvements and refinements should also be considered within the scope of protection of the present application. The structures, devices and operation methods not specifically described and explained in the present application are implemented according to conventional means in the art, unless otherwise specified and limited.

Claims

1. A CFST column reinforced with UHPC and CFRP sheet, characterized in that: The application relates to a CFST pier column reinforced by a plurality of round head studs (5) and a carbon fiber grid (3) fixed to the outer side of the CFST pier column, wherein the CFST pier column comprises a concrete column (1) and a steel pipe (2) fixed to the outer side of the concrete column (1). The round head studs (5) are welded to the outer side of the steel pipe (2), the carbon fiber grid (3) is fixed to the outer side of the steel pipe (2), the round head studs (5) penetrate the carbon fiber grid (3), the outer sides of the carbon fiber grid (3) and the round head studs (5) are fixedly connected with a UHPC reinforcing layer (4), and the outer side of the UHPC reinforcing layer (4) is fixedly connected with a carbon fiber cloth (6). The application further comprises two arc-shaped frames which can be combined into a stud positioning support on the outer side of the steel pipe (2), and the plurality of round head studs (5) are respectively arranged on the two arc-shaped frames. The arc-shaped frame comprises an arc-shaped guide frame (13), a vertical guide frame (15) and a frame structure, the frame structure comprises two vertical support plates (7) and two horizontal support plates (8), one end of one of the vertical support plates (7) is fixedly connected with one end of the two horizontal support plates (8), one end of the other vertical support plate (7) is fixedly connected with the other end of the two horizontal support plates (8), the outer side of the horizontal support plate (8) is provided with a horizontal sliding groove (11) and a second inlet and outlet (12) located at one end of the horizontal sliding groove (11), the horizontal sliding groove (11) and the second inlet and outlet (12) are in communication, the inner side of the vertical support plate (7) is provided with a vertical sliding groove (9) and a first inlet and outlet (10) located at the upper end of the vertical sliding groove (9), the vertical sliding groove (9) and the first inlet and outlet (10) are in communication, the upper and lower ends of the inner side of the vertical guide frame (15) are fixedly connected with second sliding blocks (16), the second sliding blocks (16) can enter the interior of the horizontal sliding groove (11) through the second inlet and outlet (12), and the second sliding blocks (16) are slidably connected in the horizontal sliding groove (11), the two ends of the outer side of the arc-shaped guide frame (13) are fixedly connected with first sliding blocks (14), the first sliding blocks (14) can enter the interior of the vertical sliding groove (9) through the first inlet and outlet (10), and the first sliding blocks (14) can vertically slide in the vertical sliding groove (9). The interior of the arc-shaped guide frame (13) is provided with an arc-shaped positioning groove, the interior of the vertical guide frame (15) is provided with a vertical positioning groove, and the overlapping position of the arc-shaped positioning groove and the vertical positioning groove is a mounting area, and the plurality of round head studs (5) are fixedly connected with the plurality of mounting areas.

2. The CFST column strengthened by the UHPC filled with CFRP according to claim 1, characterized in that: Both upper and lower sides of the arc-shaped guide frame (13) are fixedly connected with second return springs (21), one 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 through a second double-hole threaded connection sleeve (23), the second threaded block (22) and the second double-hole threaded connection sleeve (23) are screwed, and one side of the two transverse support plates (8) away from each other is rotatably connected with a second single-hole threaded connection sleeve (24), the second single-hole threaded connection sleeve (24) is screwed on the outside of the second threaded block (22). Both left and right sides of the vertical guide frame (15) are fixedly connected with first return springs (17), one 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 through a first double-hole threaded connection sleeve (19), the first threaded block (18) and the first double-hole threaded connection sleeve (19) are screwed, and the two vertical support plates (7) are rotatably connected with first single-hole threaded connection sleeves (20), and the first single-hole threaded connection sleeves (20) are screwed on the outside of the first threaded block (18).

3. The CFST column strengthened by the UHPC filled with CFRP according to claim 1, characterized in that: The installation area is inserted with a nail body mounting block (25), the round-head peg (5) comprises a peg shaft (26), the peg shaft (26) is mounted in the inside of the nail body mounting block (25), one end of the peg shaft (26) is fixedly connected with a nail body round head (27), one end of the nail body mounting block (25) close to the nail body round head (27) is fixedly connected with a first limiting ring (28), and the first limiting ring (28) is fixedly connected with a magnet block (29).

4. The CFST column strengthened by the UHPC filled with CFRP according to claim 1, characterized in that: The installation area is inserted with a nail body mounting block (25), the round-head peg (5) comprises a peg shaft (26), the peg shaft (26) is mounted in the inside of the nail body mounting block (25), one end of the peg shaft (26) is fixedly connected with a nail body round head (27), one end of the nail body mounting block (25) close to the nail body round head (27) is fixedly connected with a first limiting ring (28), and the first limiting ring (28) is fixedly connected with a magnet block (29).

5. The CFST column strengthened by the UHPC filled with CFRP according to claim 4, characterized in that: One end of the nail body round head (27) is provided with an arc surface (32).

6. The CFST column externally strengthened with UHPC reinforced with CFRP sheets according to claim 4, characterized in that: The peg shaft (26) is slidably connected in the inside of the nail body mounting block (25), and a third return spring (31) is fixedly connected between the first limiting ring (28) and the nail body round head (27). The peg shaft (26) is slidably connected in the inside of the nail body mounting block (25), and a third return spring (31) is fixedly connected between the first limiting ring (28) and the nail body round head (27).

7. The CFST column externally strengthened with UHPC reinforced with CFRP sheets according to claim 4, characterized in that: The outer side of the vertical support plate (7) and the transverse support plate (8) is fixedly connected with an outer shell (35), both sides of the outer shell (35) are fixedly connected with a connecting plate (36), the connecting plates (36) on the two outer shells (35) are connected through connecting bolts (37), the inner part of the outer shell (35) is fixedly connected with a position adjusting mechanism, a conductive block (48) is installed on the position adjusting mechanism, the outer side of the nail body round head (27) is fixedly connected with a welding core (34), the outer side of the welding core (34) is fixedly connected with a layer of coating layer (33).

8. The CFST column strengthened by the UHPC filled with CFRP according to claim 7, characterized in that: The position adjusting mechanism comprises a vertical guide rail (38) fixedly connected to the inner wall of the outer shell (35), a connecting sliding block (41) is vertically and slidably connected to the vertical guide rail (38), a first servo motor (39) is fixedly connected to the outer shell (35), a vertically arranged screw rod (40) is fixedly connected to the output end of the first servo motor (39), the screw rod (40) is threadedly connected with the connecting sliding block (41), an arc-shaped guide rail (42) is fixedly connected to the connecting sliding block (41), a sliding seat (43) is slidably connected to 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 sliding seat (43), the piston rod of the electric push rod (47) is fixedly connected with the conductive block (48), the output end of the second servo motor (44) is fixedly connected with a meshing gear (45), a meshing groove (46) is formed in the inner side of the arc-shaped guide rail (42), and the meshing gear (45) and the meshing groove (46) are meshedly connected.

9. A construction method of a CFST column reinforced with UHPC and CFRP, the method comprising the steps of: providing a CFST column reinforced with UHPC and CFRP according to any one of claims 1-8; and pouring concrete into the CFRP. The method comprises the following steps: Step 1: welding a round head bolt (5) on the outer side of the steel pipe (2); Step 2: cleaning the dust and residues on the column with a water gun; Step 3: arranging a layer of carbon fiber grid (3) on the outer side of the steel pipe (2) and fixedly connecting them; Step 4: installing a mold on the outer side of the steel pipe (2) and outside the carbon fiber grid (3) and the round head bolt (5); Step 5: pouring UHPC into the mold, forming a UHPC reinforced layer (4) after standing, then removing the mold and curing for one week; Step 6: wrapping a layer of carbon fiber cloth (6) on the outer side of the UHPC reinforced layer (4) after curing.

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