CFST pier column wrapped with CFRP cloth and internally filled with UHPC for reinforcement and construction method

Abstract

The invention belongs to the technical field of CFST pier column reinforcement, and particularly relates to a CFST pier column externally wrapped with CFRP cloth and internally poured with UHPC for reinforcement and a construction method.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 a steel pipe is fixedly connected to the outer side of the concrete column; 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 by using 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, and 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 ductility of the structure can be well improved.

Description

Technical Field

[0001] The invention belongs to the technical field of CFST pier reinforcement, and specifically relates to a CFST pier reinforced with UHPC filled inside and covered with CFRP cloth, and a construction method. Background Art

[0002] As buildings are used for longer periods of time, reasonable maintenance and reinforcement measures need to be taken to resolve problems, whether they are due to insufficient building bearing capacity caused by improper design, poor building quality due to supervision issues during construction, or damage to buildings caused by natural disasters.

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

[0004] Nowadays, the commonly used reinforcement methods for steel tube concrete structures have certain limitations. For example, the reinforcement method of increasing the cross section using ordinary concrete has a great impact on the deadweight of the structure. UHPC can overcome these problems to a certain extent with its excellent mechanical properties and excellent durability, but there are currently very few studies on the use of UHPC to reinforce steel tube concrete structures. Summary of the invention

[0005] The object of the present invention is to provide a CFST pier column reinforced with UHPC poured inside and a construction method, which can reduce the increased size and deadweight of the CFST pier column when reinforcing the CFST pier column and can better increase the structural ductility.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A CFST pier column with CFRP cloth wrapped outside and UHPC poured inside, comprising a plurality of round-head bolts fixedly connected to the outside of the CFST pier column and a layer of carbon fiber grid, wherein the CFST pier column comprises a concrete column, and a steel pipe is fixedly connected to the outside of the concrete column;

[0008] The round head bolt is welded to the outside of the steel pipe, the carbon fiber grid is fixed to the outside of the steel pipe, and the round head bolt penetrates the carbon fiber grid, the outside of the carbon fiber grid and the round head bolt are fixedly connected with a UHPC reinforcement layer, and the outside of the UHPC reinforcement layer is fixedly connected with a carbon fiber cloth.

[0009] Furthermore, it also includes two arc-shaped frames, which can be assembled on the outside of the steel pipe into a nail body positioning bracket, and a plurality of round-head bolts are respectively installed on the two arc-shaped frames;

[0010] The cam frame comprises an arc guide frame, a vertical guide frame and a frame structure, and the frame structure comprises two vertical support plates and two horizontal support plates, wherein the upper and lower ends of one of the vertical support plates are respectively fixedly connected to one end of the two horizontal support plates, and the upper and lower ends of the other vertical support plate are respectively fixedly connected to the other ends of the two horizontal support plates; the outer side of the horizontal support plate is provided with a horizontal slide groove and a second inlet and outlet located at one end of the horizontal slide groove, the horizontal slide groove and the second inlet and outlet are communicated with each other, the inner side of the vertical support plate is provided with a vertical slide groove and a first inlet and outlet located at the upper end of the vertical slide groove, the vertical slide groove and the first inlet and outlet are communicated with each other, the upper and lower ends of the inner side of the vertical guide frame are fixedly connected with a second slider, the second slider can enter the interior of the horizontal slide groove through the second inlet and outlet, and the second slider can be slidably connected in the interior of the horizontal slide groove, the two ends of the outer side of the arc guide frame are fixedly connected with the first slider, the first slider can enter the interior of the vertical slide groove through the first inlet and outlet, and the first slider can slide vertically in 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 position of the arc-shaped positioning groove and the vertical positioning groove is the installation area, and the multiple round head bolts are fixedly connected to the multiple installation areas respectively.

[0012] Furthermore, the upper and lower sides of the arc-shaped guide frame are fixedly connected with a second return spring, one end of the second return spring away from the arc-shaped guide frame is fixedly connected with a second threaded block, two adjacent second threaded blocks are connected by a second double-hole threaded connection sleeve, the second threaded block and the second double-hole threaded connection sleeve are threadedly connected, and the sides of the two transverse bracket plates close to each other are rotatably connected with a second single-hole threaded connection sleeve, and the second single-hole threaded connection sleeve is threadedly connected to the outer side of the second threaded block;

[0013] The left and right sides of the vertical guide frame are fixedly connected with a first return spring, and the end of the first return spring away from the vertical guide frame is fixedly connected with a first threaded block, and two adjacent first threaded blocks are connected by a first double-hole threaded connection sleeve, and the first threaded block and the first double-hole threaded connection sleeve are threadedly connected, and the two vertical bracket plates are rotatably connected with a first single-hole threaded connection sleeve, and the first single-hole threaded connection sleeve is threadedly connected to the outer side of the first threaded block.

[0014] Furthermore, a nail body mounting block is inserted inside the mounting area, and the round-head bolt includes a bolt rod body, which is mounted inside the nail body mounting block, and one end of the bolt rod body is fixedly connected to the round head of the nail body, and the outer end of the nail body mounting block close to the round head of the nail body is fixedly connected to a first limiting ring, and the first limiting ring is fixedly connected to a magnet block.

[0015] Furthermore, a nail body mounting block is inserted inside the mounting area, and the round head bolt includes a bolt rod body, the bolt rod body is mounted inside the nail body mounting block, and one end of the bolt rod body is fixedly connected to the round head of the nail body, and a first limiting ring is fixedly connected to the end of the outer side of the nail body mounting block close to the round head of the nail body, an external thread is provided on the outer side of the nail body mounting block away from the round head of the nail body, and a second limiting ring is threadedly connected to the outer side of the external thread.

[0016] A construction method for reinforcing a CFST pier column by wrapping CFRP cloth outside and pouring UHPC inside, comprising the following steps:

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

[0018] Step 2: Use a water gun to clean the dust and debris on the column;

[0019] Step 3: Arrange a layer of carbon fiber grid on the outside of the steel pipe for fixed connection;

[0020] Step 4: Install a mold on the outside of the steel tube, outside the carbon fiber grid and round head bolts;

[0021] Step 5: Pour UHPC into the mold, let it stand to form a UHPC reinforcement layer, then remove the mold and cure for one week;

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

[0023] The technical effects achieved by the present invention are:

[0024] (1) The CFST pier column reinforced with UHPC and wrapped with CFRP cloth on the outside of the present invention can improve the ductility of the reinforced column by using high ductility materials such as carbon fiber mesh and carbon fiber cloth. The UHPC reinforcement layer makes the structure light, high-strength, durable and corrosion-resistant, and easy to construct. Compared with the existing reinforcement method, the technical solution increases the original size and deadweight of the structure less, and increases the ductility of the structure better. The reinforcement effect is twice the result with half the effort, and has good social and economic benefits.

[0025] (2) The CFST pier column reinforced with UHPC and CFRP cloth wrapped outside the present invention can carry out the positioning work of the round head bolts in advance by integrating multiple round head bolts in the arc frame. The positioning work of the round head bolts is put in front. At the construction site, only two arc frames need to be fixedly connected to the outside of the steel pipe to complete the positioning work of the multiple round head bolts, thereby reducing the positioning work of the round head bolts at the pier column reinforcement site, thereby reducing the difficulty of reinforcing the pier column. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the cross-section structure in Example 1 of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of Embodiment 2-3 of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of Embodiment 2-3 of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the arc frame of the present invention;

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

[0031] Figure 6 The present invention Figure 4 A partial enlarged view of the middle A;

[0032] Figure 7 The present invention Figure 4 Schematic diagram of the cutaway structure at A in the middle;

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

[0034] Fig. 9 It is a structural schematic diagram of the position adjustment mechanism of the present invention;

[0035] Fig.10 The present invention Fig. 9 A partial enlarged view of point B in the middle.

[0036] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0037] 1. Concrete column; 2. Steel pipe; 3. Carbon fiber grid; 4. UHPC reinforcement layer; 5. Round head bolt; 6. Carbon fiber cloth; 7. Vertical bracket plate; 8. Horizontal bracket plate; 9. Vertical slide; 10. First inlet and outlet; 11. Horizontal slide; 12. Second inlet and outlet; 13. Arc 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 connection sleeve; 20. First single-hole threaded connection sleeve; 21. Second return spring; 22. Second threaded block; 23. Second double-hole threaded connection Sleeve; 24, second single-hole threaded connection sleeve; 25, nail body mounting block; 26, bolt rod; 27, nail body round head; 28, first limiting ring; 29, magnet block; 30, second limiting ring; 31, third return spring; 32, arc surface; 33, coating layer; 34, welding core; 35, outer shell; 36, connecting plate; 37, connecting bolt; 38, vertical guide rail; 39, first servo motor; 40, screw; 41, connecting slider; 42, arc guide rail; 43, slide seat; 44, second servo motor; 45, meshing gear; 46, meshing gear groove; 47, electric push rod; 48, conductive block. DETAILED DESCRIPTION

[0038] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with embodiments. It should be understood that the following text is only used to describe one or several specific embodiments of the present invention, and does not strictly limit the scope of protection of the specific claims of the present invention.

[0039] Embodiment 1:

[0040] like Figure 1 As shown, a CFST pier column reinforced with UHPC filled inside and wrapped with CFRP cloth, comprising a plurality of round-head bolts 5 and a layer of carbon fiber mesh 3 fixedly connected to the outside of the CFST pier column, the CFST pier column comprising 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 may also be replaced by a glass fiber mesh, a polypropylene fiber mesh, or the like.

[0042] The round head bolt 5 is welded to the outside of the steel pipe 2, and the carbon fiber grid 3 is wrapped and fixed to the outside of the steel pipe 2. When wrapping the carbon fiber grid 3, a through hole needs to be opened on the carbon fiber grid 3 at a position opposite to the steel pipe 2, so that the round head bolt 5 can penetrate the carbon fiber grid 3, and the outside of the carbon fiber grid 3 and the round head bolt 5 is fixedly connected with a UHPC reinforcement layer 4, and the outside of the UHPC reinforcement layer 4 is fixedly connected with a carbon fiber cloth 6. At this time, by using high ductility materials such as the carbon fiber grid 3 and the carbon fiber cloth 6, the ductility of the reinforced column is greatly improved. The UHPC reinforcement layer 4 makes the structure light, high-strength, durable and corrosion-resistant, and easy to construct. Compared with the existing reinforcement method, the technical solution increases the original size and deadweight of the structure less, and better increases the ductility of the structure. The reinforcement effect is twice the result with half the effort, and it 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] like Figure 1-Figure 7 As shown, the technical solution improves the installation method of the round head bolts 5 on the basis of Example 1. Specifically, the CFST pier reinforced with CFRP cloth wrapped outside and UHPC poured inside also includes two arc frames. The two arc frames can be assembled into a nail body positioning bracket on the outside of the steel pipe 2. A plurality of round head bolts 5 are respectively installed on the two arc frames. By integrating the plurality of round head bolts 5 in the arc frames, the positioning work of the round head bolts 5 can be carried out in advance, and the positioning work of the round head bolts 5 can be pre-positioned. At the construction site, only the two arc frames need to be fixedly connected to the outside of the steel pipe 2 to complete the positioning work of the plurality of round head bolts 5, thereby reducing the positioning work of the round head bolts 5 at the pier reinforcement site, thereby reducing the difficulty of reinforcing the pier.

[0046] Among them, Figure 2-Figure 6As shown, the arc frame includes an arc guide frame 13, a vertical guide frame 15 and a frame structure, and the frame structure includes two vertical bracket plates 7 and two horizontal bracket plates 8, wherein the upper and lower ends of one vertical bracket plate 7 are respectively fixedly connected to one end of the two horizontal bracket plates 8, and the upper and lower ends of the other vertical bracket plate 7 are respectively fixedly connected to the other ends of the two horizontal bracket plates 8, and the outer side of the horizontal bracket plate 8 is provided with a horizontal slide groove 11 and a second inlet and outlet 12 located at one end of the horizontal slide groove 11, and the horizontal slide groove 11 and the second inlet and outlet 12 are connected, and the inner side of the vertical bracket plate 7 is provided with a vertical slide groove 9 and a first inlet and outlet 10 located at the upper end of the vertical slide groove 9, and the vertical slide groove 9 and the first inlet and outlet 10 is connected, the upper and lower ends of the inner side of the vertical guide frame 15 are fixedly connected with second sliders 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 be slidably connected inside the horizontal slide groove 11, so that the position of the vertical guide frame 15 can be adjusted on the transverse bracket plate 8, and the two ends of the outer side of the arc guide frame 13 are fixedly connected with first sliders 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 bolts 5;

[0047] An arc-shaped positioning groove is provided inside the arc-shaped guide frame 13, and a vertical positioning groove is provided inside the vertical guide frame 15. The overlapping position of the arc-shaped positioning groove and the vertical positioning groove is the installation area. Multiple round-head bolts 5 are respectively fixedly connected to the multiple installation areas, so that a corresponding number of round-head bolts 5 can be arranged on the outside of the CFST pier according to the reinforcement requirements.

[0048] like Figure 3-Figure 6 As shown, the upper and lower sides of the arc-shaped guide frame 13 are fixedly connected with second return springs 21, and 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, and two adjacent second threaded blocks 22 can be connected through a second double-hole threaded connection sleeve 23, and the second threaded block 22 and the second double-hole threaded connection sleeve 23 are threadedly connected. Through the arrangement of the second threaded block 22 and the second double-hole threaded connection sleeve 23, the two second return springs 21 between the two arc-shaped guide frames 13 can be formed into an elastic member, and the second double-hole threaded connection sleeve 23 can be threadedly connected to the outer sides of the two second threaded blocks 22 by rotating the second double-hole threaded connection sleeve 23, and the distance between the two adjacent arc-shaped guide frames 13 can be automatically adjusted by the elastic force of the elastic members between the multiple arc-shaped guide frames 13, so that the multiple arc-shaped guide frames 13 are evenly distributed;

[0049] The two lateral bracket plates 8 are rotatably connected to one side close to each other with a second single-hole threaded connection sleeve 24, and the second single-hole threaded connection sleeve 24 can be threadedly connected to the outer side of the second threaded block 22, so that multiple arc-shaped guide frames 13 can be automatically evenly distributed between the two lateral bracket plates 8 under the elastic force of the second return spring 21.

[0050] The left and right sides of the vertical guide frame 15 are fixedly connected with a first return spring 17, and one end of the first return spring 17 away from the vertical guide frame 15 is fixedly connected with a first threaded block 18, and two adjacent first threaded blocks 18 can be connected through a first double-hole threaded connection sleeve 19, and the first threaded block 18 and the first double-hole threaded connection sleeve 19 are threadedly connected. The arrangement of the first threaded block 18 and the first double-hole threaded connection sleeve 19 can make the two first return springs 17 between the two vertical guide frames 15 form an elastic member, and the first double-hole threaded connection sleeve 19 can be threadedly connected to the outer sides of the two first threaded blocks 18 by rotating the first double-hole threaded connection sleeve 19, and the distance between the two adjacent vertical guide frames 15 can be automatically adjusted by the elastic force of the elastic member between the multiple vertical guide frames 15, so that the multiple vertical guide frames 15 are evenly distributed;

[0051] The two vertical bracket plates 7 are both rotatably connected with a first single-hole threaded connection sleeve 20, which can be threadedly connected to the outer side of the first threaded block 18, so that the 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. Through the arrangement of the second return spring 21 and the first return spring 17, the arc guide frame 13 and the vertical guide frame 15 can be positioned more easily after being installed in the frame structure, so that the round head bolts 5 installed on the arc guide frame 13 and the vertical guide frame 15 can be evenly distributed.

[0052] Here, two threaded holes are provided on the first double-hole threaded connection sleeve 19 and the second double-hole threaded connection sleeve 23, and the two threaded holes are symmetrically arranged so that when the first double-hole threaded connection sleeve 19 and the second double-hole threaded connection sleeve 23 rotate unidirectionally, the two second threaded blocks 22 can be rotated and connected inside the threaded holes.

[0053] A threaded hole is provided on each of the first single-hole threaded connection sleeve 20 and the second single-hole threaded connection sleeve 24 , and the second threaded block 22 can be threadedly connected inside the first single-hole threaded connection sleeve 20 or the second single-hole threaded connection sleeve 24 .

[0054] like Figure 6-Figure 7As shown, the installation method of the round-head bolt 5 installed in the installation area is disclosed here. A nail body installation block 25 is inserted inside the installation area. The round-head bolt 5 includes a bolt rod 26. The bolt rod 26 is installed inside the nail body installation block 25, and one end of the bolt rod 26 is fixedly connected to a nail body round head 27. One end of the nail body round head 27 can be provided with an arc surface 32. The arc surface 32 and the steel pipe 2 are configured to conform to each other, so that the nail body round head 27 and the steel pipe 2 are more closely fitted. The outer end of the nail body installation block 25 close to the nail body round head 27 is fixedly connected to a first limiting ring 28, and the first limiting ring 28 can be fixedly connected to a magnet block 29 The nail body mounting block 25 can be magnetically adsorbed on the arc-shaped guide frame 13 through the magnet block 29 to complete the positioning of the nail body mounting block 25. An external thread can be provided on the outer side of the nail body mounting block 25 away from the nail body round head 27, and a second limiting ring 30 is threadedly connected to the outer side of the external thread. By respectively arranging 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, the nail body mounting block 25 can be limited by the first limiting ring 28 and the second limiting ring 30, thereby reducing the phenomenon of the nail body mounting block 25 falling off from the arc-shaped guide frame 13 and the vertical guide frame 15.

[0055] The bolt rod 26 can be fixedly connected to the inside of the nail body mounting block 25, or it can be fixedly connected to the inside of the nail body mounting block 25. Figure 6-Figure 7 As shown, the bolt rod 26 is slidably connected inside 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 third return spring 31 can be set to make the arc surface 32 and the steel pipe 2 fit tightly.

[0056] Embodiment 3:

[0057] like Figure 1-Figure 10 As shown, the technical solution improves the structure of the arc frame on the basis of Example 2, specifically, the outer sides of the vertical support plate 7 and the horizontal support plate 8 are fixedly connected with an outer shell 35, and the two sides of the outer shell 35 are fixedly connected with connecting plates 36. 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, and the interior of the outer shell 35 is fixedly connected with a position adjustment mechanism, and a conductive block 48 is installed on the position adjustment mechanism. A welding core 34 is fixedly connected to the outer side of the nail body round head 27, and a layer of coating layer 33 is fixedly connected to the outer side of the welding core 34. The side of the welding core 34 away from the nail body mounting block 25 is directly exposed, and the coating layer 33 is a coating layer pressed on the surface of the welding core 34, which can stabilize the 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 to the conductive block 48, and then the other electrode is electrically connected to the steel pipe 2. At this time, the electric push rod 47 is moved by the position adjustment mechanism so that the conductive block 48 and the bolt rod body 26 are abutted against each other, and the bolt rod body 26 and the nail body round head 27 can be used as conductive structures to guide the current to the welding core 34, and the heat energy is concentrated on the welding core 34, so that the welding core 34 completes the welding between the nail body round head 27 and the steel pipe 2, so that the nail body round head 27 can be welded more simply, reducing the manual welding process of the nail body round head 27.

[0059] 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 is vertically 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 40 is fixedly connected to the output end of the first servo motor 39, the screw 40 and the connecting slider 41 are threadedly connected, and the connecting slider 41 can be driven to move vertically by starting the first servo motor 39, an arc guide rail 42 is fixedly connected to the connecting slider 41, a slide seat 43 is slidably connected to the arc guide rail 42, and a second servo motor is fixedly connected to the inner side of the slide seat 43 44 and an electric push rod 47, the piston rod of the electric push rod 47 and the conductive block 48 are fixedly connected, the output end of the second servo motor 44 is fixedly connected with a meshing gear 45, the inner side of the arc guide rail 42 is provided with a meshing groove 46, the meshing gear 45 and the meshing groove 46 are meshingly connected, at this time, by starting the second servo motor 44, the meshing gear 45 can be driven to rotate, and under the thrust between the meshing gear 45 and the meshing groove 46, the slide 43 can slide on the arc guide rail 42, and 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.

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

[0061] Embodiment 4:

[0062] A construction method for reinforcing a CFST pier column by wrapping CFRP cloth outside and pouring UHPC inside, comprising the following steps:

[0063] Step 1: Weld round head studs 5 at equal distances on the outside of the steel pipe 2;

[0064] Step 2: Use a high-pressure water gun to clean the dust and debris on the column;

[0065] Step 3: Arrange a layer of carbon fiber mesh 3 on the outside of the steel pipe 2 for fixed connection;

[0066] Step 4: Install a mold outside the steel pipe 2 and outside the carbon fiber grid 3 and the round head bolt 5;

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

[0068] Step 6: After the curing is completed, a layer of carbon fiber cloth 6 is wrapped outside the UHPC reinforcement layer 4 to complete the reinforcement.

[0069] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A CFST pier column reinforced with UHPC and covered with CFRP cloth, characterized in that: It comprises a plurality of round-head bolts (5) fixedly connected to the outside of a CFST pier column and a layer of carbon fiber mesh (3), wherein the CFST pier column comprises a concrete column (1), and a steel pipe (2) is fixedly connected to the outside of the concrete column (1); The round-head bolt (5) is welded to the outside of the steel pipe (2), the carbon fiber grid (3) is fixed to the outside of the steel pipe (2), and the round-head bolt (5) penetrates the carbon fiber grid (3), the outsides of the carbon fiber grid (3) and the round-head bolt (5) are fixedly connected with a UHPC reinforcement layer (4), and the outside of the UHPC reinforcement layer (4) is fixedly connected with a carbon fiber cloth (6).

2. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 1 is characterized by: It also includes two arc-shaped frames, which can be assembled on the outside of the steel pipe (2) to form a nail body positioning bracket, and a plurality of round-head bolts (5) are respectively installed on the two arc-shaped frames; The arc frame comprises an arc guide frame (13), a vertical guide frame (15) and a frame structure, wherein the frame structure comprises two vertical bracket plates (7) and two transverse bracket plates (8), wherein the upper and lower ends of one of the vertical bracket plates (7) are respectively fixedly connected to one end of the two transverse bracket plates (8), and the upper and lower ends of the other vertical bracket plate (7) are respectively fixedly connected to the other ends of the two transverse bracket plates (8), and the outer side of the transverse bracket plate (8) is provided with a horizontal slide groove (11) and a second inlet and outlet (12) located at one end of the horizontal slide groove (11), and the horizontal slide groove (11) and the second inlet and outlet (12) are connected, and the inner side of the vertical bracket plate (7) is provided with a vertical slide groove ( 9) and a 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 a 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 be slidably connected inside the horizontal slide groove (11), the two ends of the outer side of the arc-shaped guide frame (13) are fixedly connected with a 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 the multiple round-head bolts (5) are respectively fixedly connected to the multiple installation areas.

3. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 2 is characterized by: The upper and lower sides of the arc-shaped guide frame (13) are fixedly connected with a second return spring (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 via 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 sides of the two transverse bracket plates (8) close to each other are rotatably connected with a second single-hole threaded connection sleeve (24); the second single-hole threaded connection sleeve (24) is threadedly connected to the outer side of the second threaded block (22); The left and right sides of the vertical guide frame (15) are both fixedly connected with a first return spring (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 via a first double-hole threaded connection sleeve (19); the first threaded block (18) and the first double-hole threaded connection sleeve (19) are threadedly connected; the two vertical bracket plates (7) are both rotatably connected with a first single-hole threaded connection sleeve (20); the first single-hole threaded connection sleeve (20) is threadedly connected to the outer side of the first threaded block (18).

4. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 2 is characterized by: A nail body mounting block (25) is inserted inside the mounting area, and the round-head bolt (5) comprises a bolt rod (26), which is mounted inside the nail body mounting block (25), and one end of the bolt rod (26) is fixedly connected to a nail body round head (27), and one end of the nail body mounting block (25) close to the nail body round head (27) is fixedly connected to a first limiting ring (28), and a magnet block (29) is fixedly connected to the first limiting ring (28).

5. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 2 is characterized by: A nail body mounting block (25) is inserted into the installation area, and the round-head bolt (5) includes a bolt rod (26), which is installed in the nail body mounting block (25), and one end of the bolt rod (26) is fixedly connected to the nail body round head (27), and the end of the nail body mounting block (25) close to the nail body round head (27) is fixedly connected to a first limiting ring (28), and an external thread is provided on the outside of the nail body mounting block (25) away from the nail body round head (27), and the outer side of the external thread is threadedly connected to a second limiting ring (30).

6. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 5 is characterized by: One end of the nail body round head (27) is provided with an arc surface (32).

7. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 5 is characterized by: The bolt rod (26) is slidably connected inside 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).

8. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 5 is characterized by: The outer sides of the vertical support plate (7) and the horizontal support plate (8) are fixedly connected to an outer shell (35), and 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). The interior of the outer shell (35) is fixedly connected to a position adjustment mechanism, and a conductive block (48) is installed on the position adjustment mechanism. The outer side of the round head (27) of the nail body is fixedly connected to a welding core (34), and the outer side of the welding core (34) is fixedly connected to a coating layer (33).

9. The CFST pier column reinforced with UHPC and covered with CFRP cloth as claimed in claim 8, characterized in that: The position adjustment mechanism comprises a vertical guide rail (38) fixedly connected to the inner wall of the outer shell (35), a connecting slider (41) being vertically slidably connected to the vertical guide rail (38), a first servo motor (39) being fixedly connected to the outer shell (35), a vertically arranged screw rod (40) being fixedly connected to the output end of the first servo motor (39), the screw rod (40) and the connecting slider (41) being threadedly connected, and an arc-shaped guide rail (41) being fixedly connected to the connecting slider (41). 2), a slide 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 slide seat (43), a piston rod of the electric push rod (47) and a 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 provided on the inner side of the arc-shaped guide rail (42), and the meshing gear (45) and the meshing groove (46) are meshingly connected.

10. A construction method for reinforcing a CFST pier column by pouring UHPC inside the CFRP cloth outside, using the CFST pier column reinforced by pouring UHPC inside the CFRP cloth outside the CFST pier column according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Welding a round head bolt (5) on the outside of the steel pipe (2); Step 2: Use a water gun to clean the dust and debris on the column; Step 3: Arrange a layer of carbon fiber mesh (3) on the outside of the steel pipe (2) for fixed connection; Step 4: Install a mold outside the steel pipe (2) and outside the carbon fiber grid (3) and the round head bolt (5); Step 5: pour UHPC into the mold, let it stand to form a UHPC reinforcement layer (4), then remove the mold and cure for one week; Step 6: Wrap a layer of carbon fiber cloth (6) on the outside of the UHPC reinforcement layer (4) after curing.

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