A PSB-based over-weight PHC pipe pile core filling structure and a construction method thereof

Abstract

The application belongs to the technical field of PHC pipe pile construction, and discloses a super-heavy PHC pipe pile core filling structure based on PSB and a construction method thereof, to solve the problems of long construction period and high cost of the existing PHC pipe pile core filling. The application comprises a plugging block, a brush and a plurality of cutting teeth are installed on the outer circumferential surface of the plugging block, and the cutting teeth are located below the brush; a gasket ring is arranged on the upper end of the plugging plate, a first PSB finish rolling threaded steel bar is fixedly installed on the middle part of the plugging block, a second PSB finish rolling threaded steel bar is further installed on the plugging block, and the first PSB finish rolling threaded steel bar is provided with a driving device for driving the first PSB finish rolling threaded steel bar to rotate and lift. The application can improve the efficiency of the PHC pipe pile core filling, shorten the construction period, and reduce the cost of the core filling under the premise of reducing the labor intensity.

Description

Technical Field

[0001] This invention belongs to the field of PHC pipe pile construction technology, specifically relating to a PSB-based ultra-heavy PHC pipe pile core filling structure and its construction method. Background Technology

[0002] Core filling is a crucial step in the construction of PHC pipe piles. The core filling process primarily serves the following purposes: (1) Improves the stress state at the top of bearing piles and tension piles, which is beneficial to the connection between the pile and the pile cap; (2) Pre-embedded core connection of multi-section pipe piles; (3) Reinforcement shall be carried out for quality problems such as cracking, breakage and broken piles that occur in the pile body during construction.

[0003] The main steps for the core filling construction of PHC pipe piles are as follows: (1) Clean the inner wall of the PHC pipe pile to remove dust and soil; (2) Insert a steel cage with end plates into the PHC pipe pile; (3) Inject grout into the pipe pile to complete the core filling operation of the PHC pipe pile.

[0004] The cleaning of the inner wall of PHC pipes is mostly done manually with brushes. This not only results in long cleaning times, but also leads to high labor intensity when the filling depth is deep, thus affecting the construction cycle of PHC pipe filling. Furthermore, because the inner wall of PHC pipes is relatively smooth (for ease of demolding after casting PHC pipe piles), the adhesion between the grout poured during filling and the PHC pipe itself is poor. However, to meet the structural strength requirements of the PHC pipe, it is necessary to increase the length of the reinforcing cage and the amount of grout poured, resulting in high filling costs. Summary of the Invention

[0005] To address the problems of long construction cycles and high costs associated with existing PHC pipe pile core filling, this invention provides a PSB-based ultra-heavy PHC pipe pile core filling structure and its construction method. This method improves the efficiency of PHC pipe pile core filling, shortens the construction cycle, and reduces core filling costs while reducing manual labor intensity.

[0006] To solve the technical problem, the technical solution adopted by this invention is as follows: A PSB-based core-filling structure for ultra-heavy PHC pipe piles is characterized by comprising a sealing block adapted to the interior of the PHC pipe pile. The sealing block has a brush and several cutting teeth mounted on its outer circumference, with the cutting teeth located below the brush. A grout-stopping ring is fitted onto the upper end of the sealing block. A first PSB fine-rolled threaded steel bar is fixedly installed in the middle of the sealing block. A second PSB fine-rolled threaded steel bar is also installed on the sealing block. The upper end of the first PSB fine-rolled threaded steel bar extends beyond the top surface of the PHC pipe pile and is equipped with a drive device for rotating and lifting the first PSB fine-rolled threaded steel bar.

[0007] In some embodiments, the driving device includes a support frame, a mounting plate mounted on the top of the support frame via a bearing, a gear ring formed on the outer circumferential surface of the mounting plate, a first drive motor mounted on the support frame, a first drive gear connected to the output shaft of the first drive motor for driving the gear ring to rotate, a second drive motor mounted on the mounting plate, a second drive gear mounted on the output shaft of the second drive motor, the second drive gear being equipped with a driven gear, the driven gear being threadedly connected to a first PSB precision-rolled threaded steel bar, and a counterweight gear mounted on the mounting plate, the second drive gear and the counterweight gear being located on opposite sides of the driven gear.

[0008] In some embodiments, the mounting plate has a through hole in the middle for the passage of a first PSB fine-rolled threaded steel bar.

[0009] In some embodiments, the upper end face of the mounting plate is provided with an annular groove, the lower end face of the mounting plate is provided with a water outlet communicating with the annular groove, the sealing block is provided with a horizontal channel and a vertical channel communicating with each other, the outlet of the horizontal channel is located on the outer circumference of the sealing block and below the grout stop ring, the water outlet is connected to a hose, and the other end of the hose is inserted into the vertical channel.

[0010] In some embodiments, the vertical channel is a threaded hole for installing a second PSB precision-rolled threaded steel bar, and a sealing plug is provided at the bottom of the threaded hole.

[0011] This invention also provides a method for core filling of ultra-heavy PHC pipe piles based on PSB, characterized in that it includes: (1) Cut the first PSB fine-rolled threaded steel bar and the second PSB fine-rolled threaded steel bar of appropriate length according to the designed filling height, and fix the first PSB fine-rolled threaded steel bar on the sealing block; wherein the sealing block is provided with a brush and several cutting teeth on its outer circumference; (2) A drive device is installed around the PHC pipe pile, and the driven gear is sleeved on the lower section of the first PSB fine-rolled threaded steel bar, while the upper end of the first PSB fine-rolled threaded steel bar passes through the mounting plate of the drive device. (3) The first drive motor of the drive equipment drives the first PSB fine-rolled threaded steel bar and the sealing block to rotate, and the second drive motor of the drive equipment drives the first PSB fine-rolled threaded steel bar and the sealing block to move downward. The brush and cutting teeth on the sealing block are used to clean and roughen the inner wall of the PHC pipe pile. (4) When the sealing block runs to the designed height inside the PHC pipe pile, the first drive motor and the second drive motor stop working, pull out the hose inserted into the vertical channel, and insert the second PSB fine-rolled threaded steel bar into the threaded hole on the sealing block. When the second PSB fine-rolled threaded steel bar is screwed into the threaded hole, it can seal the horizontal channel. (5) After the second PSB fine-rolled threaded steel bar is arranged, inject grout into the PHC pipe pile to complete the core filling operation.

[0012] In some embodiments, when the sealing block moves downward to clean the inner wall of the PHC pipe pile, cleaning water is introduced into the annular groove of the mounting plate, and the cleaning water is discharged through the horizontal channel on the sealing block to spray and wash the brush, the inner wall of the PHC pipe pile and the cutting teeth.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The filling structure of this invention utilizes a first drive motor to rotate an mounting plate. The first PSB (Precision Rolled Threaded Steel Bar), a second drive motor, a second driving gear, a driven gear, and a counterweight gear are mounted on the mounting plate. Therefore, during rotation, the mounting plate drives the first PSB and the sealing block to rotate, thereby cleaning the inner wall of the PHC (Polymerized Hybrid Carbon) pipe pile with a brush and roughening the inner wall with cutting teeth. Simultaneously, when the second drive motor drives the driven gear to rotate, the driven gear, being threadedly connected to the PSB, causes the first PSB and the sealing block to move up and down along the inner wall of the PHC pipe pile. The cutting teeth also roughen the inner wall of the PHC pipe pile, ultimately improving the adhesion and bonding between the injected grout and the PHC pipe pile during filling. Under the same strength requirements, this invention, by increasing the filling depth, reduces the amount of steel reinforcement and grout used compared to existing technologies, thus reducing filling costs.

[0014] In addition, PSB precision-rolled threaded steel bars have superior performance compared to ordinary steel bars. Under the premise of equal strength, the amount of steel bars used can be further reduced to achieve the purpose of reducing the cost of filling the core.

[0015] This invention ingeniously utilizes the structural characteristics of PSB (Precision Rolled Threaded Steel) reinforcing bars. By leveraging the high strength of PSB, the inner wall of the PHC (Polymerized Harmonized Concrete) pipe pile is roughened and cleaned. Compared to existing methods that rely on manual cleaning, this method is more convenient and efficient. Simultaneously, the driving device uses the first PSB reinforcing bar to roughen and clean the sealing block, providing support and stability for both the sealing block and the PSB reinforcing bars on it. Therefore, no additional hoisting equipment is needed, nor is it necessary to weld the PSB reinforcing bars to steel bars or I-beams for placement on the upper surface of the PHC pipe pile, further improving the efficiency of PHC pipe pile core filling.

[0016] This invention integrates the cleaning, roughening, implantation, and core filling of the inner wall of PHC pipe piles, thereby improving the efficiency of core filling. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the first PSB fine-rolled threaded steel bar of the present invention when it is installed in the drive equipment to clean the inner wall of the PHC pipe pile; Figure 2 for Figure 1 A magnified view of a portion of point A in the diagram; Figure 3 This is a schematic diagram of the structure after the sealing block of the present invention has moved to the core filling position of the PHC pipe pile and the hose has been removed; Figure 4 This is a schematic diagram of the structure of the present invention when the second PSB fine-rolled threaded steel bar is inserted into the sealing block after the hose is removed; Figure 5 This is a schematic diagram of the structure after the second PSB fine-rolled threaded steel bar is inserted into the sealing block. In this diagram, the second PSB fine-rolled threaded steel bar blocks the horizontal channel and pushes the sealing plug out of the sealing block. Figure 6 This is a schematic diagram of the structure after the grout is injected into the PHC pipe pile according to the present invention; The markings in the diagram are: 01, PHC pipe pile; 1, support frame; 2, bearing; 3, mounting plate; 4, gear ring; 5, first drive motor; 6, first drive gear; 7, second drive motor; 8, second drive gear; 9, driven gear; 10, counterweight gear; 11, annular groove; 12, outlet; 13, hose; 14, first PSB fine-rolled threaded steel bar; 15, second PSB fine-rolled threaded steel bar; 20, sealing block; 201, brush; 202, cutting teeth; 203, grout stop ring; 204, vertical channel; 205, horizontal channel; 206, sealing plug. Detailed Implementation

[0018] The present invention will be further described below with reference to embodiments. These embodiments are merely some, not all, of the embodiments of the present invention. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the protection scope of the present invention.

[0019] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Referring to the accompanying drawings, the PSB-based ultra-heavy PHC pipe pile core filling structure of the present invention includes a sealing block 20 that is adapted to the interior of the PHC pipe pile 01. The outer diameter of the sealing block 20 is slightly smaller than the inner diameter of the PHC pipe pile 01 to facilitate its smooth insertion into the interior of the PHC pipe pile 01. A brush 201 and several cutting teeth 202 are installed on the outer circumferential surface of the sealing block 20. The cutting teeth 202 are used to roughen the inner wall of the PHC pipe pile 01. Therefore, in order to reduce manufacturing costs, the cutting teeth 202 can be made by welding steel plate scraps onto the outer circumferential surface of the sealing block. The cutting teeth 202 are located below the brush 201. A grout-stopping ring 203 is fitted onto the upper end of the sealing block 20. The grout-stopping ring 203 has the function of expanding upon contact with water. After expanding upon contact with water, the grout-stopping ring 203 achieves a seal with the inner wall of the PHC pipe pile 01 to prevent or reduce leakage of the grout. The sealing block 20 is fixedly installed with a first PSB fine-rolled threaded steel bar 14 in the middle, and a second PSB fine-rolled threaded steel bar 15 is also installed on the sealing block 20. The upper end of the first PSB fine-rolled threaded steel bar 14 extends out of the top surface of the PHC pipe pile 01 and is equipped with a drive device for rotating and lifting the first PSB fine-rolled threaded steel bar 14.

[0021] In some embodiments, the driving device includes a support frame 1, with a mounting plate 3 mounted on the top of the support frame 1 via a bearing 2. A gear ring 4 is formed on the outer circumferential surface of the mounting plate 3. The support frame 1 also mounts a first drive motor 5, with a first drive gear 6 connected to the output shaft of the first drive motor 5 for driving the gear ring 4 to rotate. A second drive motor 7 is mounted on the mounting plate 3, with a second drive gear 8 mounted on the output shaft of the second drive motor 7. The second drive gear 8 is equipped with a driven gear 9, which is threadedly connected to a first PSB precision-rolled threaded steel bar 14. A counterweight gear 10 is also mounted on the mounting plate 3, with the second drive gear 8 and the counterweight gear 10 located on opposite sides of the driven gear 9. The counterweight gear 10 maintains the stability of the driven gear 9 while also providing a counterweight for the mounting plate 3.

[0022] The working process of the driving device of the present invention is as follows: a first drive motor drives the mounting plate to rotate, and the first PSB precision-rolled threaded steel bar, the second drive motor, the second driving gear, the driven gear, and the counterweight gear are mounted on the mounting plate. Therefore, during the rotation of the mounting plate, the first PSB precision-rolled threaded steel bar and the sealing block can rotate, thereby using a brush to clean the inner wall of the PHC pipe pile and using cutting teeth to roughen the inner wall of the PHC pipe pile. At the same time, when the second drive motor drives the driven gear to rotate, since the driven gear is threadedly connected to the PSB precision-rolled threaded steel bar, it drives the first PSB precision-rolled threaded steel bar and the sealing block to move up and down along the inner wall of the PHC pipe pile. The cutting teeth also roughen the inner wall of the PHC pipe pile, ultimately making the inner wall of the PHC pipe pile rough, thereby improving the adhesion and tightness between the grout injected during core filling and the PHC pipe pile. Under the same strength requirements, the present invention, compared with the prior art, can reduce the amount of steel bars and grout by increasing the core filling depth, thereby achieving the purpose of reducing the core filling cost. In addition, PSB precision-rolled threaded steel bars have superior performance compared to ordinary steel bars. Under the same stress conditions, the amount of steel bars used can be further reduced to achieve the purpose of reducing the cost of filling the core.

[0023] This invention cleverly utilizes the structural characteristics of PSB (Precision Rolled Threaded Steel) reinforcing bars. By leveraging the high strength of PSB, the inner wall of the PHC (Polymerized Harmonized Concrete) pipe pile is roughened and cleaned. Compared to existing methods that rely on manual cleaning, this method is more convenient and efficient. Simultaneously, the driving device uses the first PSB reinforcing bar to roughen and clean the sealing block, providing support and stability for both the sealing block and the PSB reinforcing bars on it. Therefore, no other hoisting equipment is needed, nor is it necessary to weld the PSB reinforcing bars to steel bars or I-beams for placement on the upper surface of the PHC pipe pile, further improving the efficiency of PHC pipe pile core filling.

[0024] For core filling of ultra-heavy PHC pipe piles, due to the large size of the PHC pipe piles themselves, the size and weight of the reinforcing cage required for core filling are also large. Lifting equipment is needed to hoist the reinforcing cage into the PHC pipe pile, and then a supporting structure is used to stabilize it at the upper end of the PHC pipe pile (existing technology generally stabilizes the reinforcing cage of the core filling to the upper end face of the PHC pipe pile by welding reinforcing bars and I-beams). However, this invention directly uses a driving device to stabilize the PSB precision-rolled threaded reinforcing bars, eliminating the need for welding the PSB precision-rolled threaded reinforcing bars.

[0025] Meanwhile, the drive equipment used to move the first PSB fine-rolled threaded steel bar can be reused to further reduce costs. When it is necessary to use the drive equipment for filling other locations, the drive equipment can be removed after welding steel bars or I-beams onto the PSB fine-rolled threaded steel bars extending from the PHC pipe pile and supporting them on top of the PHC pipe pile.

[0026] Preferably, the second driving gear, driven gear, and counterweight gear are all bevel gears. The self-weight of the sealing block and the first PSB precision-rolled threaded steel bar is used to mount the driven gear between the second driving gear and the counterweight gear. This also facilitates the configuration of driven gears of different sizes according to the size of the first PSB precision-rolled threaded steel bar, while the second driving gear and counterweight gear do not need to be replaced to meet the needs of different applications.

[0027] In some embodiments, the mounting plate has a through hole in the middle for the first PSB fine-rolled threaded steel bar to pass through. The mounting plate is connected to the bearing by a pin and a key; to facilitate the passage of the first PSB fine-rolled threaded steel bar through the mounting plate, the corresponding pin on the mounting plate is a hollow pin.

[0028] In some embodiments, the upper end face of the mounting plate 3 is provided with an annular groove 11, and the lower end face of the mounting plate 3 is provided with a water outlet 12 communicating with the annular groove 11. The sealing block 20 is provided with a horizontal channel 205 and a vertical channel 204 communicating with each other. The outlet of the horizontal channel 205 is located on the outer circumferential surface of the sealing block 20 and below the grout stop ring 203. The water outlet 12 is connected to a hose 13, and the other end of the hose 13 is inserted into the vertical channel 204.

[0029] In the specific implementation process, the upper surface of the sealing block 20 has a boss in the middle, the grout-stopping ring 203 is fitted on the boss, and the vertical channel 204 is opened on the boss. When external cleaning water is added to the annular groove 11 of the mounting plate, the cleaning water can be introduced into the sealing block 20 through the hose 13 and sprayed out from the outer circumference of the sealing block 20 through the horizontal channel 205, so as to clean the inner wall of the PHC pipe pile 01 and cool the cutting teeth 202 at the same time. At the same time, since the mounting plate 3 and the sealing block 20 rotate synchronously, the hose 13 will not get tangled.

[0030] Meanwhile, when the inner wall treatment of PHC pipe pile 01 is completed and pouring is required, pull the hose 13 upward so that the lower end of the hose is separated from the vertical channel on the sealing block. Water can then be injected into the upper part of the sealing block to soak the grout stop ring 203. This causes the grout stop ring 203 to expand when it comes into contact with water, increasing the tightness of the contact with the inner wall of PHC pipe pile 01, thereby preventing or reducing the downward leakage of the grout.

[0031] In some embodiments, the vertical channel 204 is a threaded hole for installing the second PSB fine-rolled threaded steel bar 15, and a sealing plug 206 is provided at the bottom of the threaded hole. That is to say, the threaded hole used to install the second PSB fine-rolled threaded steel bar is used as the vertical channel 204, making full use of the structural characteristics of the sealing block 20 itself to reduce manufacturing costs. At the same time, the sealing plug ensures that cleaning water can be sprayed out from the horizontal channel of the sealing block.

[0032] In the specific implementation process, when the second PSB fine-rolled threaded steel bar 15 is inserted into the sealing block 20, the second PSB fine-rolled threaded steel bar can either seal the plug 206 or retain the sealing plug 206.

[0033] Preferably, the position of the outlet 12 on the mounting plate 3 corresponds to the position of the vertical channel 204 on the sealing block 20, so as to directly insert the second PSB fine-rolled threaded steel bar 15 through the outlet.

[0034] This invention also provides a method for core filling of ultra-heavy PHC pipe piles based on PSB, comprising: (1) Cut the first PSB fine-rolled threaded steel bar and the second PSB fine-rolled threaded steel bar of appropriate length according to the designed filling height, and fix the first PSB fine-rolled threaded steel bar on the sealing block; wherein the sealing block is provided with a brush and several cutting teeth on its outer circumference; (2) Install a drive device around the PHC pipe pile and put the driven gear on the lower section of the first PSB fine-rolled threaded steel bar (that is, the initial position of the driven gear is close to the sealing block), while the upper end of the first PSB fine-rolled threaded steel bar passes through the mounting plate of the drive device. (3) The first drive motor of the drive equipment drives the first PSB fine-rolled threaded steel bar and the sealing block to rotate, and the second drive motor of the drive equipment drives the first PSB fine-rolled threaded steel bar and the sealing block to move downward. The brush and cutting teeth on the sealing block are used to clean and roughen the inner wall of the PHC pipe pile. (4) When the sealing block reaches the designed height inside the PHC pipe pile (i.e., the core filling start position), the first drive motor and the second drive motor stop working, pull out the hose inserted into the vertical channel, and insert the second PSB fine-rolled threaded steel bar into the threaded hole on the sealing block. When the second PSB fine-rolled threaded steel bar is screwed into the threaded hole, it can seal the horizontal channel, thereby preventing the grout from flowing out of the horizontal channel. In the specific implementation process, the second PSB fine-rolled threaded steel bar is arranged around the first PSB fine-rolled threaded steel bar. The number of second PSB fine-rolled threaded steel bars is arranged according to the design strength, just like the design of the steel cage in the prior art.

[0035] (5) After the second PSB fine-rolled threaded steel bars are arranged, grout is injected into the PHC pipe pile to complete the core filling operation. In the specific implementation process, after the grout is injected, a vibrator can be used to compact the grout. Those skilled in the art can understand this, so it will not be elaborated here.

[0036] In some embodiments, when the sealing block moves downward to clean the inner wall of the PHC pipe pile, cleaning water is introduced into the annular groove of the mounting plate, and the cleaning water is discharged through the horizontal channel on the sealing block to spray and wash the brush, the inner wall of the PHC pipe pile and the cutting teeth.

[0037] In some embodiments, when it is necessary to fill the core of PHC pipe piles at other locations using the drive device after completing step (5), the drive device can be removed by welding steel bars or I-beams onto the PSB fine-rolled threaded steel bars extending from the PHC pipe pile and supporting them on top of the PHC pipe pile.

Claims

1. A PSB-based ultra-heavy PHC pipe pile core filling structure, characterized in that, The system includes a sealing block that is compatible with the interior of the PHC pipe pile. The sealing block has a brush and several cutting teeth installed on its outer circumference, with the cutting teeth located below the brush. A grout-stopping ring is fitted onto the upper end of the sealing block. A first PSB fine-rolled threaded steel bar is fixedly installed in the middle of the sealing block. A second PSB fine-rolled threaded steel bar is also installed on the sealing block. The upper end of the first PSB fine-rolled threaded steel bar extends out of the top surface of the PHC pipe pile and is equipped with a drive device for rotating and lifting the first PSB fine-rolled threaded steel bar.

2. The PSB-based ultra-heavy PHC pipe pile core filling structure according to claim 1, characterized in that, The driving device includes a support frame, on the top of which a mounting plate is mounted via a bearing. A gear ring is formed on the outer circumference of the mounting plate. The support frame also houses a first drive motor, the output shaft of which is connected to a first drive gear for rotating the gear ring. A second drive motor is mounted on the mounting plate, the output shaft of which is mounted to a second drive gear. The second drive gear is equipped with a driven gear, which is threadedly connected to a first PSB precision-rolled threaded steel bar. A counterweight gear is also mounted on the mounting plate, with the second drive gear and the counterweight gear located on opposite sides of the driven gear.

3. The PSB-based ultra-heavy PHC pipe pile core filling structure according to claim 2, characterized in that, The mounting plate has a through hole in the middle for the first PSB fine-rolled threaded steel bar to pass through.

4. The PSB-based ultra-heavy PHC pipe pile core filling structure according to claim 3, characterized in that, The upper end face of the mounting plate is provided with an annular groove, and the lower end face of the mounting plate is provided with a water outlet that communicates with the annular groove. The sealing block is provided with a horizontal channel and a vertical channel that communicate with each other. The outlet of the horizontal channel is located on the outer circumference of the sealing block and below the grout stop ring. The water outlet is connected to a hose, and the other end of the hose is inserted into the vertical channel.

5. The PSB-based ultra-heavy PHC pipe pile core filling structure according to claim 4, characterized in that, The vertical channel is a threaded hole for installing the second PSB precision rolled threaded steel bar, and a sealing plug is provided at the bottom of the threaded hole.

6. A construction method for a PSB-based ultra-heavy PHC pipe pile core-filling structure, employing the PSB-based ultra-heavy PHC pipe pile core-filling structure as described in claim 5, characterized in that, include: (1) Cut the first PSB fine-rolled threaded steel bar and the second PSB fine-rolled threaded steel bar of appropriate length according to the designed filling height, and fix the first PSB fine-rolled threaded steel bar on the sealing block; wherein the sealing block is provided with a brush and several cutting teeth on its outer circumference; (2) A drive device is installed around the PHC pipe pile, and the driven gear is sleeved on the lower section of the first PSB fine-rolled threaded steel bar, while the upper end of the first PSB fine-rolled threaded steel bar passes through the mounting plate of the drive device. (3) The first drive motor of the drive equipment drives the first PSB fine-rolled threaded steel bar and the sealing block to rotate, and the second drive motor of the drive equipment drives the first PSB fine-rolled threaded steel bar and the sealing block to move downward. The brush and cutting teeth on the sealing block are used to clean and roughen the inner wall of the PHC pipe pile. (4) When the sealing block runs to the designed height inside the PHC pipe pile, the first drive motor and the second drive motor stop working, pull out the hose inserted into the vertical channel, and insert the second PSB fine-rolled threaded steel bar into the threaded hole on the sealing block. When the second PSB fine-rolled threaded steel bar is screwed into the threaded hole, it can seal the horizontal channel. (5) After the second PSB fine-rolled threaded steel bar is arranged, inject grout into the PHC pipe pile to complete the core filling operation.

7. The construction method of the PSB-based ultra-heavy PHC pipe pile core-filling structure according to claim 6, characterized in that, When the sealing block moves downward to clean the inner wall of the PHC pipe pile, cleaning water is introduced into the annular groove of the mounting plate. The cleaning water is discharged through the horizontal channel on the sealing block via the pipe to spray and wash the brush, the inner wall of the PHC pipe pile, and the cutting teeth.

8. The construction method of the PSB-based ultra-heavy PHC pipe pile core-filling structure according to claim 6 or 7, characterized in that, After completing step (5), when it is necessary to use the drive equipment to fill the core of PHC pipe piles in other locations, the drive equipment can be removed by welding steel bars or I-beams onto the PSB fine-rolled threaded steel bars extending from the PHC pipe pile and supporting them on top of the PHC pipe pile.

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