A variable inner diameter PHC pipe pile, reinforcement structure and reinforcement construction method

Abstract

The present invention relates to a variable inner diameter PHC pipe pile, a reinforcement structure and a reinforcement construction method. The variable inner diameter PHC pipe pile is assembled from a plurality of variable inner diameter single piles from top to bottom through a connection module; the reinforcement structure includes a reinforcement repair module, and the reinforcement repair module includes a prefabricated core column, a water-swelling rubber pad is bonded to the bottom of the prefabricated core column, and a steel cage connected to the prefabricated core column is provided on the water-swelling rubber pad on the periphery of the prefabricated core column. The specific steps of the reinforcement and repair construction are: detection of damaged variable inner diameter PHC pipe piles; making a reinforcement and repair module according to the detection results of the damaged area; cleaning the damaged area of ​​the variable inner diameter PHC pipe pile; accurately installing the reinforcement and repair module to the corresponding position of the damaged area; after the reinforcement and repair module is installed to the target position, the gap between the reinforcement and repair module and the variable inner diameter PHC pipe pile is grout-filled and sealed through a grouting pipe. The present invention is convenient, efficient and economical to construct, and meets the requirements for reinforcement and repair of variable inner diameter PHC pipe piles.

Description

Technical Field

[0001] The invention relates to the technical field of building foundation engineering, and in particular to a variable inner diameter PHC pipe pile, a reinforcement structure and a reinforcement construction method. Background Art

[0002] In construction, prestressed high-strength concrete (PHC) piles are widely used in foundation treatment of high-rise buildings, bridges, docks and other projects due to their excellent bearing capacity, high durability and convenient construction. However, due to the complex and changeable geological conditions, harsh construction environment or long-term overload work, PHC piles may be damaged or degraded, affecting their bearing capacity and structural safety.

[0003] Currently, common PHC pile repair methods include but are not limited to outsourcing steel bars, outsourcing carbon fiber cloth, grouting repair, and pile replacement, but these methods are often costly, complex to construct, and require a large amount of on-site work, which affects the construction period. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and provides a variable inner diameter PHC pipe pile, a reinforcement structure and a reinforcement construction method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A variable inner diameter PHC pile is assembled from a plurality of variable inner diameter single piles from top to bottom through a connection module;

[0007] Each variable inner diameter single pile includes a pile body, the outer diameter of the pile body is set uniformly from top to bottom, a center hole is arranged in the pile body, the diameter of the center hole decreases successively from top to bottom, and a plurality of concave annular grooves are arranged on the inner wall of the center hole from top to bottom. The hole formed by the center holes of all pile bodies of the variable inner diameter single pile is an inverted truncated cone structure which is wide at the top and narrow at the bottom.

[0008] A first connection groove is arranged on the outer wall of the pile body near the connection end, the first connection groove is not connected with the connection end surface of the pile body, and a plurality of first connection bolt holes and a plurality of first strong magnets are evenly arranged in the first connection groove.

[0009] A plurality of connection limit holes are provided on the connection end surface of the pile body, and a connection limit column is inserted between the corresponding connection limit holes between two adjacent pile bodies.

[0010] The connection module includes a plurality of connection circular ring plates evenly distributed around the circumference, a second connection groove is opened in the middle position of the inner wall of the connection circular ring plate, a plurality of second connection bolt holes and a plurality of second strong magnets are circumferentially arranged on the inner wall of the connection circular ring plate above and below the second connection groove, and connection bolts are arranged in the second connection bolt holes; the inner wall of the connection circular ring plate located at the upper end of the second connection groove is inserted into the first connection groove of the previous pile body, the inner wall of the connection circular ring plate located at the lower end of the second connection groove is inserted into the first connection groove of the next pile body, the raised parts of the connecting ends of the two pile bodies are inserted into the second connection groove, the first connection bolt hole and the second connection bolt hole correspond one to one and are connected by the connection bolts, and the first strong magnet and the second strong magnet correspond one to one and are adsorbed together.

[0011] There are three connecting ring plates connecting the modules.

[0012] A reinforcement structure is used to reinforce the above-mentioned variable inner diameter PHC pipe pile, including a reinforcement repair module, the reinforcement repair module includes a prefabricated core column, a water-swellable rubber pad is bonded to the bottom of the prefabricated core column, and a steel cage connected to the prefabricated core column is provided on the water-swellable rubber pad outside the prefabricated core column.

[0013] The steel cage includes several layers of horizontal radiating steel bars buried in the prefabricated core column and arranged from top to bottom. The horizontal radiating steel bars pass through the outer wall of the prefabricated core column and are connected with annular steel bars. The upper and lower annular steel bars are tied and connected by several vertical steel bars arranged circumferentially.

[0014] The diameter of the prefabricated core column is the same as the smallest diameter at the bottom of the inner hole of the variable inner diameter PHC pile.

[0015] A construction method for reinforcing and repairing a variable inner diameter PHC pile, using the above-mentioned reinforcement structure, has the following specific steps:

[0016] S1. Damaged variable inner diameter PHC pile inspection:

[0017] Conduct computer vision inspection to identify obvious cracks, fractures or other forms of damage in variable inner diameter PHC piles, and record the location, size and possible causes of the damage; use an ultrasonic testing system to scan variable inner diameter PHC piles, identify damaged areas, and assess the depth, length and location of cracks, as well as other potential defects inside the variable inner diameter PHC piles; based on the test results, record the specific parameters of the damaged area in detail to provide a basis for the design of the reinforcement and repair module;

[0018] S2. Prefabrication and selection of reinforcement and repair modules:

[0019] According to the inspection results of the damaged area, make reinforcement and repair modules to ensure that the size and shape of the reinforcement and repair modules are suitable for use in the damaged area;

[0020] S3. Clean the damaged area of ​​the variable inner diameter PHC pile and make local cuts so that the reinforcement and repair module can be accurately installed;

[0021] S4. According to the planning scheme, the reinforcement and repair modules are accurately installed at the corresponding positions of the damaged areas;

[0022] S5. After the reinforcement and repair module is installed at the target position, the gap between the reinforcement and repair module and the variable inner diameter PHC pile is filled and sealed by grouting through the grouting pipe to ensure the overall sealing and structural consistency;

[0023] S6. After the repair is completed, the repaired part is re-inspected to ensure that the reinforcement repair module is correctly installed and the structural strength meets the requirements. Other relevant performance tests are carried out to verify the repair effect.

[0024] In step S2, since the diameter of the prefabricated core column in the reinforcement and repair module is consistent with the diameter of the minimum diameter at the bottom of the inner hole of the variable inner diameter PHC pile, it is only necessary to adjust the corresponding sizes of the steel cage and the water-swellable rubber pad at the bottom according to the inspection results of the damaged area; the mold is made in the factory according to the design requirements, and the reinforcement and repair module is cast using high-strength concrete material, and maintained under controlled conditions to ensure that the concrete reaches the designed strength and durability. After completion, the reinforcement and repair module is quality inspected and used after confirmation that it meets the design standards.

[0025] The beneficial effects of the present invention are as follows: the present invention has the characteristics of convenient construction, high efficiency and economy, and while meeting the requirements for reinforcement and repair of variable inner diameter PHC pipe piles, it greatly shortens the construction period, reduces material usage, reduces environmental impact, and improves the safety and sustainability of variable inner diameter PHC pipe pile foundations. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of a variable inner diameter PHC pile in the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of a single-section variable inner diameter single pile in the present invention;

[0028] Figure 3 It is a schematic diagram of the structural cross section of a single variable inner diameter single pile in the present invention;

[0029] Figure 4 It is an exploded schematic diagram of two adjacent variable inner diameter single piles connected in the present invention;

[0030] Figure 5 It is a schematic diagram of connecting the circular ring plates in the present invention;

[0031] Figure 6 It is a schematic diagram of two adjacent variable inner diameter single piles connected in the present invention;

[0032] Figure 7 It is a structural schematic diagram of the reinforcement and repair module in the present invention;

[0033] Figure 8 It is a schematic diagram of the reinforcement and repair module of the present invention being placed in a variable inner diameter PHC pile for damage repair;

[0034] Fig. 9 It is a schematic diagram of the variable inner diameter PHC pile after the damage at a specific position is repaired in the present invention;

[0035] Fig.10 It is a schematic diagram of the variable inner diameter PHC pile after bamboo-joint reinforcement in the present invention;

[0036] In the figure, 1. Variable inner diameter single pile; 2. Connection module; 3. Reinforcement and repair module; 4. Grouting pipe; 5. Damaged area; 6. Reinforcement and repair part after pouring;

[0037] 11. Pile body; 12. Inwardly concave annular groove; 13. Connection limit column; 14. Connection limit hole; 15. First connection bolt hole; 16. First strong magnet; 17. First connection groove; 18. Center hole;

[0038] 21. Second connecting groove; 22. Second connecting bolt hole; 23. Second strong magnet; 24. Connecting bolt; 25. Connecting annular plate;

[0039] 31. Prefabricated core column; 32. Steel cage; 321. Horizontal radiating steel bars; 322. Circular steel bars; 323. Vertical steel bars; 33. Water-expandable rubber pad.

[0040] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments are only used to explain the present invention and are not used to limit the scope of the present invention. The present invention is described in more detail by way of example with reference to the accompanying drawings in the following paragraphs. The advantages and features of the present invention will become clearer according to the following description. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0042] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a component centered. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a component centered. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a component centered. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0045] A variable inner diameter PHC pile, such as Figure 1 As shown, it is composed of a number of variable inner diameter single piles 1 assembled from top to bottom through the connection modules 2.

[0046] like Figure 2 , Figure 3 , Figure 4 As shown, each variable inner diameter single pile 1 includes a pile body 11, the outer diameter of the pile body 11 is set uniformly from top to bottom, a center hole 18 is set in the pile body 11, the diameter of the center hole 18 decreases from top to bottom, and a plurality of concave annular grooves 12 are set on the inner wall of the center hole 18 from top to bottom. The hole formed by the center holes 18 of all the pile bodies 11 of the variable inner diameter single pile 1 is an inverted truncated cone structure that is wide at the top and narrow at the bottom.

[0047] The inwardly concave annular grooves 12 are arranged at equal intervals.

[0048] A first connection groove 17 is provided on the outer wall of the pile body 11 near the connection end. The first connection groove 17 is not connected to the connection end surface of the pile body 11 . A plurality of first connection bolt holes 15 and a plurality of first strong magnets 16 are evenly arranged in the first connection groove 17 .

[0049] A plurality of connection limiting holes 14 are formed on the connection end surface of the pile body 11 , and a connection limiting column 13 is inserted between the corresponding connection limiting holes 14 between two adjacent pile bodies 11 .

[0050] According to the engineering requirements and geological survey results, the specific size (including constant outer diameter and variable inner diameter) and length requirements of the variable inner diameter PHC piles are determined, high-strength concrete and prestressed steel bars that meet the design requirements are prepared, the prestressed steel bars are placed in the adjusted molds, and then the concrete is poured to ensure that the concrete is fully cured to achieve the designed strength.

[0051] Because the inner diameter changes, the variable inner diameter monomer piles 1 that need to be connected in sequence are marked with serial numbers to ensure that the inner diameters of the variable inner diameter monomer piles 1 connected up and down are evenly transitioned.

[0052] like Figure 4 , Figure 5 As shown, the connection module 2 includes a plurality of connection annular plates 25 uniformly distributed around the circumference, a second connection groove 21 is provided in the middle position of the inner wall of the connection annular plate 25, a plurality of second connection bolt holes 22 and a plurality of second strong magnets 23 are circumferentially provided on the inner wall of the connection annular plate 25 above and below the second connection groove 21, and a connection bolt 24 is provided in the second connection bolt hole 22; the inner wall of the connection annular plate 25 located at the upper end of the second connection groove 21 is inserted into the first connection groove 17 of the previous pile body 11, the inner wall of the connection annular plate 25 located at the lower end of the second connection groove 21 is inserted into the first connection groove 17 of the next pile body 11, the raised portions of the connecting ends of the two pile bodies 11 are inserted into the second connection groove 21, the first connection bolt holes 15 and the second connection bolt holes 22 correspond one to one and are connected by the connection bolts 24, and the first strong magnets 16 and the second strong magnets 23 correspond one to one and are adsorbed together.

[0053] The connection module 2 has three connection annular plates 25 .

[0054] During connection, the first strong magnet 16 and the second strong magnet 23 can be adsorbed to quickly calibrate the corresponding positions of the first connecting bolt hole 15 and the second connecting bolt hole 22 of the variable inner diameter PHC pipe pile, so as to facilitate the connection construction operation and reduce the time required for construction.

[0055] Use a pile driver to drive the first variable inner diameter single pile 1 into the ground at the designed position and angle to ensure the verticality and accurate position of the pile body; if a longer pile body is required for pile connection, when the first variable inner diameter single pile 1 is about 0.5m-1m above the ground, the corresponding second variable inner diameter single pile 1 is hoisted above the first variable inner diameter single pile 1 to ensure the verticality of the pile body and keep the same axis as the first variable inner diameter single pile 1; dock the corresponding connection limit hole 14 with the connection limit column 13, and then use the second strong magnet 23 to adsorb the connection module 2 to the corresponding position, and connect it through the high-strength connection bolt 24, such as Figure 6As shown; pile driving and pile connection are repeated until the designed depth is reached; after the final piling is completed, the inner diameter of the overall variable inner diameter PHC pipe pile driven into the ground should decrease evenly from top to bottom, forming an inverted frustum.

[0056] A reinforcement structure is used to reinforce the above-mentioned variable inner diameter PHC pile, such as Figure 7 As shown, it includes a reinforcement and repair module 3, which includes a prefabricated core column 31. A water-swellable rubber pad 33 is bonded to the bottom of the prefabricated core column 31, and a steel cage 32 connected to the prefabricated core column 31 is provided on the water-swellable rubber pad 33 at the periphery of the prefabricated core column 31.

[0057] The steel cage 32 includes several layers of horizontal radiant steel bars 321 buried in the prefabricated core column 31 and arranged from top to bottom. The horizontal radiant steel bars 321 pass through the outer wall of the prefabricated core column 31 and are connected with annular steel bars 322. The upper and lower annular steel bars 322 are tied and connected by several vertical steel bars 323 arranged circumferentially.

[0058] The diameter of the prefabricated core column 31 is the same as the smallest diameter at the bottom of the inner hole of the variable inner diameter PHC pile.

[0059] A construction method for reinforcing and repairing a variable inner diameter PHC pile, using the above-mentioned reinforcement structure, has the following specific steps:

[0060] S1. Damaged variable inner diameter PHC pile inspection:

[0061] Perform computer vision inspection to identify obvious cracks, fractures or other forms of damage in the variable inner diameter PHC piles, and record the location, size and possible causes of the damage; use an ultrasonic testing system to scan the variable inner diameter PHC piles, identify the damaged area 5, and evaluate the depth, length and location of the cracks, as well as other potential defects inside the variable inner diameter PHC piles; based on the test results, record the specific parameters of the damaged area 5 in detail to provide a basis for the design of the reinforcement and repair module 3;

[0062] S2. Prefabrication and selection of reinforcement and repair module 3:

[0063] According to the detection result of the damaged area 5, a reinforcement and repair module 3 is manufactured to ensure that the size and shape of the reinforcement and repair module 3 are suitable for use in the damaged area 5;

[0064] Since the diameter of the prefabricated core column 31 in the reinforcement and repair module 3 is consistent with the diameter of the minimum diameter of the bottom of the inner hole of the variable inner diameter PHC pile, it is only necessary to adjust the corresponding sizes of the steel cage 32 and the water-expandable rubber pad 33 at the bottom according to the detection results of the damaged area 5; the mold is made in the factory according to the design requirements, and the reinforcement and repair module 3 is cast with high-strength concrete material, and maintained under controlled conditions to ensure that the concrete reaches the designed strength and durability. After completion, the reinforcement and repair module 3 is quality inspected and used after confirming that it meets the design standards;

[0065] S3, cleaning the damaged area 5 of the variable inner diameter PHC pile and performing local cutting so that the reinforcement and repair module 3 can be accurately installed;

[0066] S4. According to the planning scheme, the reinforcement and repair module 3 is accurately installed at the corresponding position of the damaged area 5, such as Figure 8 As shown;

[0067] S5, after the reinforcement and repair module 3 is installed at the target position, the gap between the reinforcement and repair module 3 and the variable inner diameter PHC pile is filled and sealed by the grouting pipe 4, such as Fig. 9 As shown, the overall sealing and structural consistency are guaranteed;

[0068] S6. After the repair is completed, the repaired part is re-tested to ensure that the reinforcement repair module 3 is correctly installed and the structural strength meets the requirements, and other relevant performance tests are performed to verify the repair effect.

[0069] The present invention can also be used to strengthen the variable inner diameter PHC pile in bamboo joints. The schematic diagram after strengthening is as follows: Fig.10 shown.

[0070] The variable inner diameter PHC pipe pile of the present invention is connected to the connection module 2 by a high-strength connecting bolt 24. The first strong magnet 16 and the second strong magnet 23 make on-site construction more convenient and quick. The reinforcement and repair module 3 corresponding to the variable inner diameter PHC pipe pile solves the shortcomings of traditional repair methods such as grouting, pile replacement and pile replacement, and can effectively repair PHC pile damage while being cost-effective and convenient to construct.

[0071] The present invention can quickly respond to damage situations: by quickly detecting damaged variable inner diameter PHC pipe piles and prefabricating the reinforcement and repair module 3, the repair time is greatly shortened, providing convenience for emergency or necessary repair work; compared with traditional repair methods such as replacing the entire variable inner diameter PHC pipe pile or using external support, the use of the prefabricated reinforcement and repair module 3 to repair the variable inner diameter PHC pipe pile provides a more economical and efficient solution; the damaged parts of the repaired variable inner diameter PHC pipe pile are specifically reinforced, which can restore or even improve its original structural strength and stability, thereby extending the service life of the pipe pile.

[0072] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A construction method for reinforcing and repairing a variable inner diameter PHC pipe pile, characterized in that: The variable inner diameter PHC pipe pile is assembled from a plurality of variable inner diameter single piles (1) from top to bottom through a connection module (2); each variable inner diameter single pile (1) comprises a pile body (11), the outer diameter of the pile body (11) is set uniformly from top to bottom, a central hole (18) is arranged in the pile body (11), the diameter of the central hole (18) decreases from top to bottom, a plurality of concave annular grooves (12) are arranged on the inner wall of the central hole (18) from top to bottom, and the hole formed by the central holes (18) of all the pile bodies (11) of the variable inner diameter single pile (1) is an inverted truncated cone structure that is wide at the top and narrow at the bottom; The variable inner diameter PHC pipe pile is reinforced and repaired by using a reinforcement structure, the reinforcement structure comprising a reinforcement and repair module (3), the reinforcement and repair module (3) comprising a prefabricated core column (31), a water-swellable rubber pad (33) bonded to the bottom of the prefabricated core column (31), a steel cage (32) connected to the prefabricated core column (31) being arranged on the water-swellable rubber pad (33) at the periphery of the prefabricated core column (31), the steel cage (32) comprising a plurality of layers of horizontal radiating steel bars (321) buried in the prefabricated core column (31) and arranged from top to bottom, the horizontal radiating steel bars (321) passing through the outer wall of the prefabricated core column (31) and connected to annular steel bars (322), the upper and lower annular steel bars (322) being tied and connected by a plurality of vertical steel bars (323) arranged circumferentially, the diameter of the prefabricated core column (31) being the same as the smallest diameter at the bottom of the inner hole of the variable inner diameter PHC pipe pile; The specific steps are: S1. Damaged variable inner diameter PHC pile inspection: Conduct computer vision inspection to identify obvious cracks, fractures or other forms of damage in the variable inner diameter PHC piles, and record the location, size and possible cause of the damage; use an ultrasonic testing system to scan the variable inner diameter PHC piles to identify the damaged area (5), evaluate the depth, length and location of the cracks, and other potential defects inside the variable inner diameter PHC piles; based on the test results, record the specific parameters of the damaged area (5) in detail to provide a basis for the design of the reinforcement and repair module (3); S2. Reinforcement and repair module (3) prefabrication and selection: According to the detection result of the damaged area (5), a reinforcement and repair module (3) is manufactured to ensure that the size and shape of the reinforcement and repair module (3) are suitable for use in the damaged area (5); S3, cleaning the damaged area (5) of the variable inner diameter PHC pile and performing local cutting so that the reinforcement and repair module (3) can be accurately installed; S4. According to the planning scheme, the reinforcement and repair module (3) is accurately installed at the corresponding position of the damaged area (5); S5. After the reinforcement and repair module (3) is installed at the target position, the gap between the reinforcement and repair module (3) and the variable inner diameter PHC pile is filled and sealed by grouting through the grouting pipe (4) to ensure the overall sealing and structural consistency; S6. After the repair is completed, the repaired part is re-tested to ensure that the reinforcement repair module (3) is correctly installed and the structural strength meets the requirements. Other relevant performance tests are performed to verify the repair effect.

2. The construction method for reinforcing and repairing a variable inner diameter PHC pipe pile according to claim 1 is characterized in that: In step S2, since the diameter of the prefabricated core column (31) in the reinforcement and repair module (3) is consistent with the diameter of the minimum diameter of the bottom of the inner hole of the variable inner diameter PHC pile, it is only necessary to adjust the corresponding sizes of the steel cage (32) and the water-swellable rubber pad (33) at the bottom according to the detection results of the damaged area (5); the mold is made in the factory according to the design requirements, and the reinforcement and repair module (3) is cast using high-strength concrete materials. The module is cured under controlled conditions to ensure that the concrete reaches the designed strength and durability. After completion, the reinforcement and repair module (3) is quality inspected and used after confirming that it meets the design standards.

3. The construction method for reinforcing and repairing a variable inner diameter PHC pipe pile according to claim 2 is characterized in that: A first connection groove (17) is provided on an outer wall of the pile body (11) near the connection end, the first connection groove (17) is not connected to the connection end surface of the pile body (11), and a plurality of first connection bolt holes (15) and a plurality of first strong magnets (16) are evenly arranged in the first connection groove (17).

4. The construction method for reinforcing and repairing a variable inner diameter PHC pile according to claim 3 is characterized in that: A plurality of connection limiting holes (14) are provided on the connection end surface of the pile body (11), and a connection limiting column (13) is inserted between the corresponding connection limiting holes (14) between two adjacent pile bodies (11).

5. The construction method for reinforcing and repairing a variable inner diameter PHC pipe pile according to claim 4 is characterized in that: The connection module (2) comprises a plurality of connection circular plates (25) evenly distributed around the circumference, a second connection groove (21) being provided in the middle of the inner wall of the connection circular plate (25), a plurality of second connection bolt holes (22) and a plurality of second strong magnets (23) being provided around the inner wall of the connection circular plate (25) above and below the second connection groove (21), and connection bolts (24) being provided in the second connection bolt holes (22); the inner wall of the connection circular plate (25) located at the upper end of the second connection groove (21) is inserted into the upper pile The connecting ring plate (25) is located in the first connecting groove (17) of the pile body (11), the inner wall of the lower end of the second connecting groove (21) is inserted into the first connecting groove (17) of the next pile body (11), the protrusions of the connecting ends of the two pile bodies (11) are inserted into the second connecting groove (21), the first connecting bolt hole (15) and the second connecting bolt hole (22) correspond to each other and are connected by the connecting bolt (24), and the first strong magnet (16) and the second strong magnet (23) correspond to each other and are adsorbed together.

6. The construction method for reinforcing and repairing a variable inner diameter PHC pipe pile according to claim 5 is characterized in that: The connection module (2) has three connection annular plates (25).

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