A top closed steel pipe pile

Abstract

The present invention relates to the technical field of steel pipe piles, and specifically to a top-closed steel pipe pile, comprising an outer pipe and an inner pipe, wherein the lower end of the outer pipe is closed, the inner pipe slides up and down inside the outer pipe, the outer wall of the inner pipe is provided with a sliding seal, the sliding seal is slidably connected to the inner wall of the outer pipe, the top of the inner pipe is provided with a support ring, and the support ring is supported at the top opening of the outer pipe; a sealing assembly is installed inside the inner pipe, the sealing assembly is used to seal the inside of the inner pipe, and comprises a first sealing plate and a second sealing plate, a connecting rod is provided between the first sealing plate and the second sealing plate, and the first sealing plate and the second sealing plate are both threadedly connected to the inner wall of the inner pipe. In the present invention, the space between the outer pipe and the inner pipe can be placed in a negative pressure state, with an adsorption tension on the water surface, thereby increasing the vertical pull-out bearing capacity of the steel pipe pile.

Description

Technical Field

[0001] The invention relates to the technical field of steel pipe piles, and in particular to a top-closed steel pipe pile. Background Art

[0002] Top closed steel pipe pile is a specially designed steel pipe pile, the main feature of which is that the top of the pile is closed to form an enclosed space.

[0003] Due to its unique structural characteristics, top closed steel pipe piles are usually used in a variety of occasions that require high-strength bearing and stability, such as port and dock foundation bearing. In the construction of these infrastructures, top closed steel pipe piles can provide stable foundation support to ensure the safety and durability of ports and docks. They generally need to be inserted into water. The pull-out bearing capacity of steel pipe piles is mainly composed of internal and external friction and the deadweight of the steel pipe piles. However, the foundation of steel pipe piles acting on ports or docks is generally composed of mud or gravel. However, in this environment, the vertical tensile bearing capacity of steel pipe piles will inevitably be relatively low. Summary of the invention

[0004] Technical issues solved

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a top closed steel pipe pile, which can effectively solve the problem that the pull-out bearing capacity of the steel pipe pile in the prior art is mainly composed of internal and external friction and the deadweight of the steel pipe pile, but the foundation of the steel pipe pile acting on the port or dock is generally composed of mud or gravel, and the vertical tensile bearing capacity of the steel pipe pile in this environment is bound to be relatively low.

[0006] Technical Solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] The present invention provides a top-closed steel pipe pile, comprising an outer pipe and an inner pipe, wherein the lower end of the outer pipe is closed, the inner pipe slides up and down inside the outer pipe, the outer wall of the inner pipe is provided with a sliding seal, the sliding seal is slidably connected to the inner wall of the outer pipe, and the top of the inner pipe is provided with a support ring, the support ring is supported at the top opening of the outer pipe;

[0009] A sealing assembly is installed inside the inner tube. The sealing assembly is used to seal the inside of the inner tube and includes a first sealing plate and a second sealing plate. A connecting rod is provided between the first sealing plate and the second sealing plate. The first sealing plate and the second sealing plate are both threadedly connected to the inner wall of the inner tube.

[0010] Furthermore, an annular sealing disk is provided below the first sealing plate and the second sealing plate, a reserved hole is provided on the second sealing plate, and an inner and outer ring sealing ring is provided on the top of each sealing disk, and the inner and outer ring sealing rings are respectively located on both sides of the reserved hole.

[0011] Furthermore, a tube edge platform is fixedly installed on the outer side of the outer tube, a telescopic member is arranged on the tube edge platform, the upper end of the telescopic member is connected to the lower side of the support ring, and the telescopic member is used to drive the inner tube to move up and down.

[0012] Furthermore, a support block is fixedly installed below the support ring, and the support ring and the support block are respectively provided with a mounting through hole and a connecting through hole, the mounting through hole and the connecting through hole are interconnected, and the support ring and the support block are connected to each other through a threaded rod.

[0013] Furthermore, it also includes a fixing component, which includes a rotating ring rotatably installed between the outer tube and the inner tube, the outer wall of the inner tube is provided with a guide groove for driving the rotating ring to rotate, the rotating ring is provided with a linkage slide rod sliding in the guide groove, a support member is provided above the rotating ring, one end of the support member extends out of the outer tube, and a guide slide groove is provided above the rotating ring for guiding the support member to extend outward.

[0014] Furthermore, a sliding through hole is provided on the outer tube, and the support member includes a sliding rod slidably installed inside the sliding through hole, an extension block is provided at one end of the sliding rod extending out of the outer tube, a mounting block is fixedly installed at the other end of the sliding rod, a limiting rod passing through the guide slot is fixedly installed below the mounting block, and the limiting rod is slidably connected to the inner wall of the guide slot.

[0015] Furthermore, a plurality of through grooves are provided in the middle of the sliding rod, the length of the through grooves is greater than the thickness of the outer tube, one end of the through grooves extends to the mounting block, and the plurality of through grooves are distributed in a circular ring shape on the outer peripheral surface of the sliding rod.

[0016] Furthermore, a sealing gasket is provided on the end surface of the protruding block facing the outer peripheral surface of the outer tube, the lower end of the protruding block is extended downward, a hook-shaped plate is provided on the lower end of the protruding block, and the sealing gasket is used to block the outside of the sliding through hole.

[0017] Beneficial Effects

[0018] Compared with the known public technology, the technical solution provided by the present invention has the following beneficial effects:

[0019] In the present invention, an inner tube that slides up and down is arranged inside the outer tube, so that the inner tube slides up and down inside the outer tube in a sealed manner. The height of the inner tube inside the outer tube can be appropriately adjusted as needed, and the inner tube is closed by a sealing assembly and moved downward, so that the space between the outer tube and the inner tube is in an overpressure state, which can increase the compressive strength of the outer wall of the outer tube and make the outer tube less likely to deform during the downward pressure process. After the outer tube moves to the specified position, the sealing assembly is opened and closed again, and then the inner tube is moved upward, so that the space between the outer tube and the inner tube is in a negative pressure state, thereby increasing the vertical pull-out bearing capacity of the steel pipe pile. In the present invention, by arranging a tube edge platform on the outside of the outer tube and arranging a telescopic member for driving the inner tube to move up and down on the tube edge platform, the up and down movement of the inner tube can be conveniently adjusted, and the air pressure strength between the inner tube and the outer tube can be conveniently changed by adjusting the up and down movement position of the inner tube. In addition, by adjusting the up and down position of the inner tube, when the outer tube is pressed down and inserted into the foundation, the support ring of the inner tube is supported at the upper tube mouth of the outer tube, so that the inner tube and the outer tube can jointly withstand the downward impact force, and the outer tube or the inner tube can be prevented from being deformed when it is subjected to impact during the downward sinking process by hammering or vibration. In the present invention, by arranging a fixed component between the outer tube and the inner tube, the rotating ring is driven to rotate during the upward movement stage of the inner tube, so that multiple support members can be extended outward, and one end of the support member can be inserted into the foundation outside the outer tube, so that the connection strength between the outer tube and the foundation can be higher, and the vertical pull-out bearing capacity of the outer tube can be increased. In the present invention, a sliding through hole is provided on the outer tube so that the sliding rod can pass through it. After the inner tube moves upward to drive the rotating ring to rotate, the sliding rod slides in a direction away from the outer tube driven by the mounting block at the tail, so that the protruding block located outside the outer tube is inserted into the foundation, so that the outer tube can be more firmly inserted into the interior of the foundation, and the vertical pull-out bearing capacity of the outer tube can be increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of a half-section structure of the present invention;

[0023] Figure 3 An exploded view of the present invention;

[0024] Figure 4It is a schematic diagram of the internal structure of the inner tube of the present invention;

[0025] Figure 5 is a side view of the interior of the inner tube of the present invention;

[0026] Figure 6 An exploded view of the internal structure of the inner tube of the present invention;

[0027] Figure 7 It is a schematic diagram of the overall structure of the fixing assembly of the present invention;

[0028] Figure 8 For the present invention Figure 7 Schematic diagram of the local enlarged structure at A.

[0029] The numbers in the figure represent:

[0030] 1. Outer tube; 101. Sliding through hole; 11. Tube edge platform; 12. Telescopic member; 13. Support block; 1301. Connecting through hole; 2. Inner tube; 201. Guide groove; 21. Support ring; 2101. Mounting through hole; 22. Sliding seal;

[0031] 3. Sealing assembly; 31. First sealing plate; 32. Second sealing plate; 3201. Reserved hole; 33. Connecting rod; 34. Sealing disk; 341. Sealing ring;

[0032] 4. Fixed assembly; 41. Rotating ring; 4101. Guide slide groove; 411. Linkage slide rod; 42. Support member; 4201. Through groove; 421. Sliding rod; 422. Mounting block; 423. Limiting rod; 424. Extending block; 425. Sealing pad. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] The present invention will be further described below in conjunction with the embodiments.

[0035] When the top closed steel pipe pile is used, in order to improve the vertical pull-out bearing capacity of the steel pipe pile, the interior of the steel pipe pile is usually placed in a negative pressure state.

[0036] To this end, an embodiment of the present invention provides a top closed steel pipe pile, whose purpose is at least to flexibly adjust the pressure state inside the steel pipe pile so that the steel pipe pile is in an overpressure state during the downward pressing process, thereby increasing the compressive strength of the steel pipe pile; after the steel pipe pile is installed in place, the steel pipe pile is in a negative pressure state, thereby increasing the vertical pull-out bearing capacity of the steel pipe pile.

[0037] Embodiment: A top closed steel pipe pile, such as Figure 1-Figure 4 As shown, it comprises an outer tube 1 and an inner tube 2, the lower end of the outer tube 1 is closed, the inner tube 2 slides up and down inside the outer tube 1, the outer wall of the inner tube 2 is provided with a sliding seal 22, the sliding seal 22 is slidably connected to the inner wall of the outer tube 1, and the top of the inner tube 2 is provided with a support ring 21, and the support ring 21 is supported at the top opening of the outer tube 1;

[0038] The sealing assembly 3 is installed inside the inner tube 2. The sealing assembly 3 is used to seal the inside of the inner tube 2. The sealing assembly 3 includes a first sealing plate 31 and a second sealing plate 32. A connecting rod 33 is provided between the first sealing plate 31 and the second sealing plate 32. The first sealing plate 31 and the second sealing plate 32 are both threadedly connected to the inner wall of the inner tube 2.

[0039] In the present invention, an inner tube 2 that slides up and down is provided inside the outer tube 1, so that the inner tube 2 can slide up and down in a sealed manner inside the outer tube 1. The height of the inner tube 2 inside the outer tube 1 can be appropriately adjusted as needed, and a sealing component 3 that can seal the inner tube 2 is provided inside the inner tube 2. During the downward pressing of the steel pipe pile, the sealing component 3 can be used to seal the inner tube 2 and move the inner tube 2 downward, so that the space between the outer tube 1 and the inner tube 2 is in an overpressure state, which can increase the compressive strength of the outer wall of the outer tube 1 and make the outer tube 1 less likely to deform during the downward pressing process. After the outer tube 1 moves to the specified position, the sealing component 3 is opened and closed again, and then the inner tube 2 is moved upward, so that the space between the outer tube 1 and the inner tube 2 is in a negative pressure state, thereby increasing the vertical pull-out bearing capacity of the steel pipe pile.

[0040] Furthermore, if Figure 5 , Figure 6 As shown, an annular sealing disk 34 is disposed below the first sealing plate 31 and the second sealing plate 32, and the sealing disk 34 is sealed and welded to the inner wall of the inner tube 2. A reserved hole 3201 is disposed on the second sealing plate 32, and an inner and outer ring sealing ring 341 is disposed on the top of each sealing disk 34, and the inner and outer ring sealing ring 341 are respectively located on both sides of the reserved hole 3201.

[0041] Among them, by setting a reserved hole 3201 on the second sealing plate 32, when the second sealing plate 32 is tightly connected with the sealing disk 34, the reserved hole 3201 is pressed against the sealing disk 34 for sealing, which can prevent water or air inside the outer tube 1 from entering the second sealing plate 32 from the reserved hole 3201. When the second sealing plate 32 is rotated to rotate upward, the bottom of the sealing disk 34 and the second sealing plate 32 can be moved away from each other, so that the reserved hole 3201 on the second sealing plate 32 can be exposed. At this time, water or air inside the outer tube 1 can enter the second sealing plate 32 from the reserved hole 3201, and the pressure state between the outer tube 1 and the inner tube 2 can be adjusted conveniently in coordination with the upward and downward movement of the inner tube 2.

[0042] Furthermore, if Figure 2 , Figure 3 As shown, a tube edge platform 11 is fixedly installed on the outer side of the outer tube 1, and a telescopic member 12 is arranged on the tube edge platform 11. The upper end of the telescopic member 12 is connected to the lower side of the support ring 21, and the telescopic member 12 is used to drive the inner tube 2 to move up and down.

[0043] Among them, by arranging a tube edge platform 11 on the outer side of the outer tube 1 and arranging a telescopic member 12 on the tube edge platform 11 for driving the inner tube 2 to move up and down, the up and down movement of the inner tube 2 can be conveniently adjusted, and the air pressure strength between the inner tube 2 and the outer tube 1 can be conveniently changed by adjusting the up and down movement position of the inner tube 2. In addition, by adjusting the up and down position of the inner tube 2, when the outer tube 1 is pressed down and inserted into the foundation, the support ring 21 of the inner tube 2 is supported at the upper tube mouth of the outer tube 1, so that the inner tube 2 and the outer tube 1 can jointly withstand the downward impact force, which can avoid the outer tube 1 or the inner tube 2 from being deformed when it is subjected to impact during the downward sinking process by hammering or vibration.

[0044] Furthermore, if Figure 3 , Figure 4 As shown, a support block 13 is fixedly installed below the support ring 21, and a mounting through hole 2101 and a connecting through hole 1301 are respectively provided on the support ring 21 and the support block 13. The mounting through hole 2101 and the connecting through hole 1301 are interconnected, and the support ring 21 and the support block 13 are connected to each other through a threaded rod.

[0045] Among them, by fixing the support block 13 below the support ring 21, when the inner tube 2 is at the lowest point, the support block 13 is supported on the tube edge platform 11, so that the pressure exerted by the inner tube 2 on the outer tube 1 can be partially distributed to the support block 13 and the tube edge platform 11, which can increase the impact strength of the inner tube 2 and the outer tube 1. In addition, after the outer tube 1 is installed to the specified position, the height of the inner tube 2 inside the outer tube 1 is adjusted to adjust the height of the upper end support of the inner tube 2. By increasing the number of support blocks 13, multiple support blocks 13 can be placed vertically, and the multiple support blocks 13 are connected to each other by threaded rods.

[0046] Furthermore, if Figure 6 , Figure 7 As shown, it also includes a fixing component 4, which includes a rotating ring 41 rotatably installed between the outer tube 1 and the inner tube 2, the outer wall of the inner tube 2 is provided with a guide groove 201 for driving the rotating ring 41 to rotate, and the rotating ring 41 is provided with a linkage slide rod 411 sliding in the guide groove 201, and a support member 42 is provided above the rotating ring 41, one end of the support member 42 extends out of the outer tube 1, and a guide slide groove 4101 is provided above the rotating ring 41 for guiding the support member 42 to extend outward.

[0047] Among them, by setting a fixing component 4 between the outer tube 1 and the inner tube 2, when the inner tube 2 moves upward, the rotating ring 41 is driven to rotate, so that multiple support members 42 can be extended outward, and one end of the support member 42 can be inserted into the foundation outside the outer tube 1, so that the connection strength between the outer tube 1 and the foundation can be higher, and the vertical pull-out bearing capacity of the outer tube 1 (i.e., the steel pipe pile) can be increased.

[0048] Furthermore, if Figure 6 , Figure 7 As shown, the outer tube 1 is provided with a sliding through hole 101, and the support member 42 includes a sliding rod 421 slidably installed inside the sliding through hole 101, and one end of the sliding rod 421 extending out of the outer tube 1 is provided with a protruding block 424, and the other end of the sliding rod 421 is fixedly installed with a mounting block 422, and a limiting rod 423 passing through the guide slot 4101 is fixedly installed below the mounting block 422, and the limiting rod 423 is slidably connected to the inner wall of the guide slot 4101.

[0049] Among them, by setting a sliding through hole 101 on the outer tube 1, the sliding rod 421 can pass through. After the inner tube 2 moves up to drive the rotating ring 41 to rotate, the sliding rod 421 slides in the direction away from the outer tube 1 driven by the mounting block 422 at the tail, so that the protruding block 424 located on the outside of the outer tube 1 is inserted into the foundation, which can make the outer tube 1 more firmly inserted into the inside of the foundation, and can increase the vertical pull-out bearing capacity of the outer tube 1.

[0050] Furthermore, if Figure 6 , Figure 7 As shown, a plurality of through grooves 4201 are provided in the middle of the sliding rod 421, the length of the through groove 4201 is greater than the thickness of the outer tube 1, one end of the through groove 4201 extends to the mounting block 422, and the plurality of through grooves 4201 are distributed in a circular ring shape on the outer peripheral surface of the sliding rod 421.

[0051] Among them, by setting a through groove 4201 in the middle of the sliding rod 421, when it is necessary to adjust the space between the outer tube 1 and the inner tube 2 from an overpressure state to a negative pressure state, by driving the inner tube 2 to move upward, the through groove 4201 can be located in the middle of the sliding through hole 101, so that the space between the outer tube 1 and the inner tube 2 can be connected with the external space. After that, the inner tube 2 continues to move upward, and the external water will enter the interior of the outer tube 1 from the through groove 4201, and as the inner tube 2 rises, the water level inside the outer tube 1 continues to rise, and by adjusting the rising height of the inner tube 2, the liquid level inside the outer tube 1 can be made higher than the external water level, so that the water surface can produce an adsorption effect on the outer tube 1, and the vertical pull-out bearing capacity of the outer tube 1 (i.e., the steel pipe pile) can be improved.

[0052] Furthermore, if Figure 7 and Figure 8 As shown, a sealing gasket 425 is provided on the end face of the protruding block 424 facing the outer peripheral surface of the outer tube 1, and the lower end of the protruding block 424 is extended downward. A hook-shaped plate is provided on the lower end of the protruding block 424, and the sealing gasket 425 is used to block the outside of the sliding through hole 101.

[0053] When the outer tube 1 is inserted into the foundation, the upper end of the extending block 424 is located above the foundation, and the lower end of the extending block 424 is inserted into the foundation.

[0054] It should be noted that the through groove 4201 will be closed only when the inner tube 2 is at the lowest point. At this time, the sealing gasket 425 set on the protruding block 424 is always close to the outside of the outer tube 1. When the inner tube 2 moves upward, the through groove 4201 always penetrates the interior and external space of the outer tube 1.

[0055] Working principle: In the process of pressing the outer tube 1 and the inner tube 2 into the foundation, by moving the inner tube 2 downward inside the outer tube 1, and at the same time tightly installing the first sealing plate 31 and the second sealing plate 32 of the sealing assembly 3 inside the inner tube 2, the space between the outer tube 1 and the inner tube 2 can be in an overpressure state. At this time, the outer tube 1 can be smoothly pressed into the foundation by external hammering or pressing down. After the outer tube 1 is installed in place, the inner tube 2 is driven to move upward by the telescopic member 12. When the inner tube 2 moves to a certain position, it will drive the rotating ring 41 to rotate, so that the support member 42 can be extended outward, so that the support member The hook-shaped plate on 42 is inserted into the foundation to further improve the vertical pull-out bearing capacity of the outer tube 1 (i.e., the steel pipe pile). At the same time, during the movement of the support member 42, the through groove 4201 on the sliding rod 421 will penetrate the space inside the outer tube 1 and the outside world, allowing the water above the foundation to enter the outer tube 1 (at this time, the sealing component 3 is in the open state). After that, closing the sealing component 3 and continuing to move the inner tube 2 upward will cause negative pressure to be generated inside the outer tube 1, so that the liquid level inside the outer tube 1 can continue to move upward, causing the water surface to generate adsorption tension on the outer tube 1, which can further improve the vertical pull-out bearing capacity of the outer tube 1 (i.e., the steel pipe pile).

[0056] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A top closed steel pipe pile, characterized in that: include: An outer tube (1) and an inner tube (2), wherein the lower end of the outer tube (1) is closed, and the inner tube (2) slides up and down inside the outer tube (1); a sliding seal (22) is provided on the outer wall of the inner tube (2), and the sliding seal (22) is slidably connected to the inner wall of the outer tube (1); a support ring (21) is provided on the top of the inner tube (2), and the support ring (21) is supported at the top opening of the outer tube (1); A sealing assembly (3) is installed inside the inner tube (2), the sealing assembly (3) is used to seal the inside of the inner tube (2), and comprises a first sealing plate (31) and a second sealing plate (32), a connecting rod (33) is provided between the first sealing plate (31) and the second sealing plate (32), and the first sealing plate (31) and the second sealing plate (32) are both threadedly connected to the inner wall of the inner tube (2); An annular sealing disk (34) is disposed below each of the first sealing plate (31) and the second sealing plate (32); a reserved hole (3201) is disposed on the second sealing plate (32); an inner and outer sealing ring (341) is disposed on the top of each sealing disk (34); the inner and outer sealing rings (341) are respectively located on two sides of the reserved hole (3201); A tube edge platform (11) is fixedly mounted on the outer side of the outer tube (1), a telescopic member (12) is arranged on the tube edge platform (11), the upper end of the telescopic member (12) is connected to the lower side of the support ring (21), and the telescopic member (12) is used to drive the inner tube (2) to move up and down.

2. A top closed steel pipe pile according to claim 1, characterized in that: A support block (13) is fixedly mounted below the support ring (21); a mounting through hole (2101) and a connecting through hole (1301) are respectively provided on the support ring (21) and the support block (13); the mounting through hole (2101) and the connecting through hole (1301) are interconnected; and the support ring (21) and the support block (13) are connected to each other via a threaded rod.

3. The top closed steel pipe pile according to claim 1, characterized in that: The invention also comprises a fixing assembly (4), the fixing assembly (4) comprising a rotating ring (41) rotatably mounted between the outer tube (1) and the inner tube (2), the outer wall of the inner tube (2) being provided with a guide groove (201) for driving the rotating ring (41) to rotate, the rotating ring (41) being provided with a linkage slide rod (411) sliding in the guide groove (201), a support member (42) being provided above the rotating ring (41), one end of the support member (42) extending out of the outer tube (1), and a guide slide groove (4101) being provided above the rotating ring (41) for guiding the support member (42) to extend outward.

4. A top-closed steel pipe pile according to claim 3, characterized in that: The outer tube (1) is provided with a sliding through hole (101), and the support member (42) comprises a sliding rod (421) slidably mounted inside the sliding through hole (101), an end of the sliding rod (421) extending out of the outer tube (1) is provided with a protruding block (424), and the other end of the sliding rod (421) is fixedly mounted with a mounting block (422), and a limiting rod (423) passing through the guide slide groove (4101) is fixedly mounted below the mounting block (422), and the limiting rod (423) is slidably connected to the inner wall of the guide slide groove (4101).

5. The top closed steel pipe pile according to claim 4, characterized in that: A plurality of through grooves (4201) are provided in the middle of the sliding rod (421); the length of the through grooves (4201) is greater than the thickness of the outer tube (1); one end of the through groove (4201) extends to the mounting block (422); and the plurality of through grooves (4201) are distributed in a circular ring shape on the outer peripheral surface of the sliding rod (421).

6. The top closed steel pipe pile according to claim 5, characterized in that: A sealing gasket (425) is provided on the end surface of the protruding block (424) facing the outer peripheral surface of the outer tube (1); the lower end of the protruding block (424) is extended downward; a hook-shaped plate is provided on the lower end of the protruding block (424); and the sealing gasket (425) is used to block the outside of the sliding through hole (101).

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